WO2020238222A1

WO2020238222A1 - Combined cycle power device

Info

Publication number: WO2020238222A1
Application number: PCT/CN2020/000119
Authority: WO
Inventors: 李华玉
Original assignee: 李华玉
Priority date: 2019-05-26
Filing date: 2020-05-25
Publication date: 2020-12-03
Also published as: CN115217544A

Abstract

A combined cycle power device. A condenser (9) is provided with a condensate pipeline which is in communication with a hybrid evaporator (10) by means of a circulation pump (5); an expander (1) is provided with a low-pressure steam passage which is in communication with the hybrid evaporator (10) by means of a high-temperature evaporator (8); the hybrid evaporator (10) is also provided with a low-pressure steam passage which is in direct communication with a compressor (3) and is in communication with the condenser (9) by means of a third expander (4); the compressor (3) is also provided with a steam passage which is in communication with a high-temperature heat exchanger (7); the condenser (9) is also provided with a condensate pipeline which is in communication with the high-temperature evaporator (8) by means of a second circulation pump (6), and then the high-temperature evaporator (8) is further provided with a steam passage which is in communication with a second expander (2); the second expander (2) is also provided with a steam passage which is in communication with the high-temperature heat exchanger (7); the high-temperature heat exchanger (7) is also provided with a steam passage which is in communication with the expander (1); and the high-temperature heat exchanger (7) is also provided with a heat source medium passage which is in communication with the outside, the condenser (9) is also provided with a cooling medium passage which is in communication with the outside, and the expander (1) is connected to the compressor (3) and transmits power, so as to form the combined cycle power device.

Description

Combined cycle power plant

Technical field:

The invention belongs to the field of energy and power technology.

Background technique:

Cold demand, heat demand and power demand are common in human life and production; among them, the conversion of heat energy into mechanical energy is an important way to obtain and provide power. In general, the temperature of the heat source decreases with the release of heat, and the heat source changes temperature. When fossil fuels are used as the source of energy, the heat source has the dual characteristics of high temperature and variable temperature, which makes it difficult for power plants based on a single thermal cycle to convert more heat energy into mechanical energy; for high-quality fuels, traditional ones can be used. The gas-steam combined cycle achieves high thermal efficiency, but there are still problems such as high cost, large investment, and thermal efficiency to be improved.

Take the external combustion steam power plant as an example, the heat source is high temperature and variable temperature heat source; when the Rankine cycle is used as the theoretical basis, water vapor is used as the circulating working fluid to achieve thermal variable work, due to the temperature and pressure resistance of the material And safety restrictions, no matter what parameters are used, there is a large temperature difference between the circulating working fluid and the heat source, and the irreversible loss is large, resulting in low thermal efficiency, which also means that the potential for improving thermal efficiency is great.

People need simple, active, safe and efficient use of thermal energy to obtain power. For this reason, the present invention proposes a combined cycle steam power device that has high thermal efficiency, strong safety, adapts to high-temperature heat sources or variable-temperature heat sources, and can handle various fuels. .

Summary of the invention:

The main purpose of the present invention is to provide a combined cycle power plant. The specific content of the invention is described as follows:

1. Combined cycle power plant, mainly composed of expander, second expander, compressor, third expander, circulating pump, second circulating pump, high temperature heat exchanger, high temperature evaporator, condenser and mixed evaporator ; The condenser has a condensate pipeline connected to the mixing evaporator via a circulating pump, the expander has a low-pressure steam channel connected to the mixing evaporator via a high-temperature evaporator, and the mixing evaporator has a low-pressure steam channel directly connected to the compressor and through the first The third expander is connected to the condenser, the compressor also has a steam channel connected to the high-temperature heat exchanger, and the condenser and the condensate pipeline are connected to the high-temperature evaporator through the second circulating pump. After the high-temperature evaporator has a steam channel and a second The expander is connected, the second expander also has a steam channel connected to the high temperature heat exchanger, the high temperature heat exchanger also has a steam channel connected to the expander; the high temperature heat exchanger also has a heat source medium channel connected to the outside, the high temperature evaporator or The heat source medium channel is connected to the outside, the condenser and the cooling medium channel are connected to the outside, the mixed evaporator or the heat source medium channel is connected to the outside, and the expander is connected to the compressor and transmits power to form a combined cycle power device; or The expander connects the compressor, the circulation pump and the second circulation pump and transmits power.

2. Combined cycle power plant, mainly composed of expander, second expander, compressor, third expander, circulating pump, second circulating pump, high temperature heat exchanger, high temperature evaporator, condenser, mixed evaporator and supply The condenser has a condensate pipeline connected with the mixing evaporator via a circulating pump, the expander has a low-pressure steam channel connected with the mixing evaporator via a high-temperature evaporator and a heat supply, and the mixing evaporator has a low-pressure steam channel respectively Directly communicate with the compressor and communicate with the condenser through the third expander. The compressor also has a steam channel connected with the high-temperature heat exchanger, and the condenser and the condensate pipeline are connected with the high-temperature evaporator through the second circulating pump and then the high-temperature evaporation The second expander has a steam channel connected with the second expander, the second expander has a steam channel connected with the high temperature heat exchanger, the high temperature heat exchanger has a steam channel connected with the expander; the high temperature heat exchanger has a heat source medium channel connected with External communication, the high-temperature evaporator or the heat source medium channel communicates with the outside, the condenser also has the cooling medium channel communicates with the outside, the mixed evaporator or the heat source medium channel communicates with the outside, the heat supply also has the heated medium channel and Externally connected, the expander is connected to the compressor and transmits power to form a combined cycle power device; wherein, or the expander is connected to the compressor, the circulating pump and the second circulating pump and transmits the power.

3. Combined cycle power plant, mainly composed of expander, second expander, compressor, third expander, circulating pump, second circulating pump, high temperature heat exchanger, high temperature evaporator, condenser, mixed evaporator and Composed of four expanders; the condenser has a condensate pipeline connected to the mixing evaporator via a circulating pump, the expander has a low-pressure steam channel connected to the mixing evaporator via a high-temperature evaporator, and the fourth expander has a low-pressure steam channel via a high-temperature evaporator Connected with the mixing evaporator, the mixing evaporator has a low-pressure steam channel directly connected with the compressor and connected with the condenser via the third expander, the compressor has a steam channel connected with the high-temperature heat exchanger, and the condenser has condensate After the pipeline is connected to the high-temperature evaporator through the second circulating pump, the high-temperature evaporator has a steam passage to communicate with the second expander. The second expander also has a steam passage to communicate with the high-temperature heat exchanger, and the high-temperature heat exchanger also has intermediate steam. The channel is connected to the fourth expander, the high temperature heat exchanger also has a steam channel connected to the expander; the high temperature heat exchanger also has a heat source medium channel connected to the outside, the high temperature evaporator or a heat source medium channel communicates with the outside, and the condenser also There is a cooling medium channel communicating with the outside, a mixed evaporator or a heat source medium channel communicating with the outside, the expander and the fourth expander are connected to the compressor and transmit power to form a combined cycle power plant; among them, or the expander and the fourth expansion The machine connects the compressor, the circulating pump and the second circulating pump and transmits power.

4. Combined cycle power plant, mainly composed of expander, second expander, compressor, third expander, circulating pump, second circulating pump, high temperature heat exchanger, high temperature evaporator, condenser, mixed evaporator, supply The condenser is composed of a heat exchanger and a fourth expander; the condenser has a condensate pipeline connected to the mixing evaporator through a circulating pump, and the expander has a low-pressure steam channel connected to the mixing evaporator through a high temperature evaporator and a heat supply device, and the fourth expander There is a low-pressure steam passage that communicates with the mixing evaporator through a high-temperature evaporator and a heat supply device. The mixing evaporator and a low-pressure steam passage are respectively directly connected to the compressor and connected to the condenser through the third expander. The compressor also has a steam passage and The high-temperature heat exchanger is connected, and the condenser and the condensate pipeline are connected to the high-temperature evaporator through the second circulating pump. After the high-temperature evaporator has a steam passage connected with the second expander, the second expander also has a steam passage and high-temperature heat. The high-temperature heat exchanger has an intermediate steam channel connected to the fourth expander, the high-temperature heat exchanger has a steam channel connected to the expander; the high-temperature heat exchanger has a heat source medium channel connected to the outside, and the high-temperature evaporator or There is also a heat source medium channel communicating with the outside, a condenser and a cooling medium channel communicating with the outside, a mixed evaporator or a heat source medium channel communicating with the outside, the heat supply device also has a heated medium channel communicating with the outside, the expander and the second The four expanders are connected to the compressor and transmit power to form a combined cycle power plant; among them, or the expander and the fourth expander are connected to the compressor, the circulating pump and the second circulating pump and transmit power.

5. Combined cycle power plant, mainly composed of expander, second expander, compressor, third expander, circulating pump, second circulating pump, high temperature heat exchanger, high temperature evaporator, condenser, mixed evaporator and high temperature It is composed of a regenerator; the condenser has a condensate pipeline connected to the mixing evaporator through a circulating pump, and the expander has a low-pressure steam channel that communicates with the mixing evaporator through a high-temperature regenerator and a high-temperature evaporator, and the mixing evaporator also has low-pressure steam The channels are directly connected to the compressor and connected to the condenser through the third expander. The compressor and the steam channel are connected to the high-temperature heat exchanger through the high-temperature regenerator, and the condenser and the condensate pipeline are connected to the condenser through the second circulating pump. After the high-temperature evaporator is connected, the high-temperature evaporator has a steam passage to communicate with the second expander. The second expander also has a steam passage that communicates with the high-temperature heat exchanger through the high-temperature regenerator. The high-temperature heat exchanger also has a steam passage and the expander. Connected; the high temperature heat exchanger also has a heat source medium channel to communicate with the outside, a high temperature evaporator or a heat source medium channel to communicate with the outside, a condenser also has a cooling medium channel to communicate with the outside, a mixed evaporator or a heat source medium channel with the outside In connection, the expander is connected to the compressor and transmits power to form a combined cycle power device; wherein, or the expander is connected to the compressor, the circulating pump and the second circulating pump and transmits the power.

6. Combined cycle power plant, mainly composed of expander, second expander, compressor, third expander, circulating pump, second circulating pump, high temperature heat exchanger, high temperature evaporator, condenser, mixed evaporator, supply It is composed of a heat exchanger and a high-temperature regenerator; the condenser has a condensate pipeline connected to the mixing evaporator through a circulating pump, and the expander has a low-pressure steam channel that is connected to the mixing evaporator through the high-temperature regenerator, high-temperature evaporator and heat supply , The mixing evaporator has a low-pressure steam channel directly connected with the compressor and connected with the condenser via the third expander, the compressor has a steam channel connected with the high-temperature heat exchanger via a high-temperature regenerator, and the condenser has a condensate After the pipeline is connected to the high-temperature evaporator through the second circulating pump, the high-temperature evaporator has a steam channel to communicate with the second expander, and the second expander also has a steam channel to communicate with the high-temperature heat exchanger through the high-temperature regenerator for high-temperature heat exchange The high-temperature heat exchanger also has a heat source medium channel to communicate with the outside, the high-temperature evaporator or a heat source medium channel communicates with the outside, the condenser also has a cooling medium channel communicates with the outside, and the mixed evaporator Or the heat source medium channel is connected to the outside, and the heater has a heated medium channel to communicate with the outside. The expander is connected to the compressor and transmits power to form a combined cycle power device; among them, or the expander is connected to the compressor, circulating pump and The second circulating pump and transmission power.

7. The combined cycle power plant is to add a low-temperature regenerator and a third circulating pump to any of the combined cycle power plants described in items 1-6, and connect the condensate pipeline of the condenser to the circulating pump through the circulating pump. The communication of the mixed evaporator is adjusted so that the condenser has a condensate pipeline connected to the low-temperature regenerator via a circulating pump, the compressor is additionally provided with an intermediate extraction channel to communicate with the low-temperature regenerator, and the low-temperature regenerator has a condensate pipeline through the third The circulation pump is connected with the mixing evaporator to form a combined cycle power plant.

8. The combined cycle power plant is to add a new regenerator and a new circulating pump to any of the combined cycle power plants described in items 1-7, and connect the condenser with the condensate pipeline through the second The communication between the circulating pump and the high-temperature evaporator is adjusted so that the condenser has a condensate pipeline connected to the newly added regenerator via the second circulating pump. The compressor is provided with an additional intermediate extraction channel to communicate with the newly added regenerator. The condensate pipeline is connected to the high-temperature evaporator through the newly added circulating pump to form a combined cycle power plant.

Description of the drawings:

Figure 1/8 is the first principle thermal system diagram of the combined cycle power plant provided by the present invention.

Figure 2/8 is the second principle thermal system diagram of the combined cycle power plant provided by the present invention.

Figure 3/8 is the third principle thermal system diagram of the combined cycle power plant provided by the present invention.

Figure 4/8 is the fourth principle thermal system diagram of the combined cycle power plant provided by the present invention.

Figure 5/8 is the fifth principle thermal system diagram of the combined cycle power plant according to the present invention.

Figure 6/8 is the sixth principle thermal system diagram of the combined cycle power plant according to the present invention.

Figure 7/8 is the seventh principle thermal system diagram of the combined cycle power plant according to the present invention.

Figure 8/8 is the eighth principle thermal system diagram of the combined cycle power plant provided by the present invention.

In the figure, 1-expander, 2-second expander, 3-compressor, 4-third expander, 5-circulation pump, 6-second circulation pump, 7-high temperature heat exchanger, 8-high temperature evaporation Heater (waste heat boiler), 9-condenser, 10-mixed evaporator (second waste heat boiler), 11-heater, 12-fourth expander, 13-high temperature regenerator, 14-low temperature regenerator , 15-The third circulating pump; A-new regenerator, B-new circulating pump.

Detailed ways:

The first thing to note is that in the expression of the structure and process, it is not repeated unless necessary; the obvious process is not described. The present invention will be described in detail below with reference to the drawings and examples.

The combined cycle power plant shown in Figure 1/8 is realized as follows:

(1) Structurally, it is mainly composed of expander, second expander, compressor, third expander, circulating pump, second circulating pump, high temperature heat exchanger, high temperature evaporator, condenser and mixed evaporator Condenser 9 has a condensate pipeline connected to the mixing evaporator 10 through the circulating pump 5, the expander 1 has a low-pressure steam channel connected to the mixing evaporator 10 through the high-temperature evaporator 8, and the mixing evaporator 10 also has a low-pressure steam channel directly It communicates with the compressor 3 and communicates with the condenser 9 through the third expander 4, the compressor 3 also has a steam channel connected with the high-temperature heat exchanger 7, and the condenser 9 also has a condensate pipeline that communicates with the high temperature through the second circulating pump 6 After the evaporator 8 is connected, the high-temperature evaporator 8 has a steam channel to communicate with the second expander 2. The second expander 2 also has a steam channel connected with the high-temperature heat exchanger 7, and the high-temperature heat exchanger 7 has a steam channel with the expander. 1 is connected; the high temperature heat exchanger 7 also has a heat source medium channel to communicate with the outside, the high temperature evaporator 8 also has a heat source medium channel to communicate with the outside, the condenser 9 also has a cooling medium channel to communicate with the outside, and the expander 1 is connected to the compressor 3 Transmission power.

(2) In the process, the first condensate of the condenser 9 is boosted by the circulating pump 5 into the mixing evaporator 10, mixed with the low-pressure steam from the high-temperature evaporator 8, absorbs heat and rises up and vaporizes into saturated or superheated steam. Divided into two paths-the first path enters the compressor 3 to increase the pressure and then enters the high temperature heat exchanger 7 to absorb heat and increase the temperature, and the second path flows through the third expander 4 to reduce pressure and then enter the condenser 9 to release heat and condense; The second condensate of the condenser 9 is boosted by the second circulating pump 6 into the high-temperature evaporator 8, absorbs heat, increases, vaporizes and overheats, flows through the second expander 2 to reduce pressure, and then enters the high-temperature heat exchanger 7 Heat absorption and temperature rise; the steam discharged from the high-temperature heat exchanger 7 flows through the expander 1 to reduce pressure, and the low-pressure steam discharged from the expander 1 flows through the high-temperature evaporator 8 to release heat and cools, and then enters the hybrid evaporator 10 to release heat and cool; heat source medium The high-temperature heat exchanger 7 and the high-temperature evaporator 8 provide driving heat load, the cooling medium takes away the low-temperature heat load through the condenser 9, the expander 1 provides power to the compressor 3, the expander 1, the second expander 2, and the third The expander 4 provides power to the outside to form a combined cycle power plant.

The combined cycle power plant shown in Figure 2/8 is implemented as follows:

(1) Structurally, it is mainly composed of expander, second expander, compressor, third expander, circulating pump, second circulating pump, high temperature heat exchanger, high temperature evaporator, condenser, mixed evaporator and supply The condenser 9 has a condensate pipeline connected to the mixing evaporator 10 through the circulating pump 5, and the expander 1 has a low-pressure steam channel connected to the mixing evaporator 10 through the high temperature evaporator 8 and the heat supply 11, and the mixed evaporator The device 10 also has a low-pressure steam passage directly connected with the compressor 3 and connected with the condenser 9 through the third expander 4, the compressor 3 has a steam passage connected with the high-temperature heat exchanger 7, and the condenser 9 has a condensate pipe After the second circulating pump 6 communicates with the high-temperature evaporator 8, the high-temperature evaporator 8 has a steam passage to communicate with the second expander 2, and the second expander 2 also has a steam passage to communicate with the high-temperature heat exchanger 7 for high-temperature heat exchange. The device 7 also has a steam channel connected to the expander 1; the high-temperature heat exchanger 7 has a heat source medium channel connected to the outside, the condenser 9 has a cooling medium channel connected to the outside, and the heater 11 has a heated medium channel connected to the outside. Connected, the expander 1 is connected to the compressor 3 and transmits power.

(2) In the process, the first condensate of the condenser 9 is boosted by the circulating pump 5 into the mixing evaporator 10, mixed with the low-pressure steam from the heater 11, absorbing heat and increasing temperature and vaporizing into saturated or superheated steam. Divided into two paths-the first path enters the compressor 3 to increase the pressure and then enters the high temperature heat exchanger 7 to absorb heat and increase the temperature, and the second path flows through the third expander 4 to reduce pressure and then enter the condenser 9 to release heat and condense; The second condensate of the condenser 9 is boosted by the second circulating pump 6 into the high-temperature evaporator 8, absorbs heat, increases, vaporizes and overheats, flows through the second expander 2 to reduce pressure, and then enters the high-temperature heat exchanger 7 Heat absorption and heating, the steam discharged from the high-temperature heat exchanger 7 flows through the expander 1 to reduce pressure; the low-pressure steam discharged from the expander 1 flows through the high-temperature evaporator 8 and the heat supply 11 to gradually release heat and cool down, and then enter the mixed evaporation The heat source medium passes through the high temperature heat exchanger 7 to provide driving heat load, the cooling medium passes through the condenser 9 to take away the low temperature heat load, the heated medium passes through the heat supply device 11 to take away the medium temperature heat load, and the expander 1 The compressor 3 provides power, and the expander 1, the second expander 2 and the third expander 4 provide power to the outside to form a combined cycle power plant.

The combined cycle power plant shown in Figure 3/8 is implemented as follows:

(1) In terms of structure, it is mainly composed of expander, second expander, compressor, third expander, circulating pump, second circulating pump, high temperature heat exchanger, high temperature evaporator, condenser, mixed evaporator and first The condenser 9 has a condensate pipeline connected to the mixing evaporator 10 via the circulating pump 5, the expander 1 has a low-pressure steam channel connected to the mixing evaporator 10 via the high-temperature evaporator 8, and the fourth expander 12 has The low-pressure steam passage communicates with the mixing evaporator 10 through the high-temperature evaporator 8. The mixing evaporator 10 has a low-pressure steam passage directly connected with the compressor 3 and connected with the condenser 9 through the third expander 4, and the compressor 3 has steam. The channel is connected to the high-temperature heat exchanger 7, and the condenser 9 also has a condensate pipeline connected to the high-temperature evaporator 8 through the second circulation pump 6. After the high-temperature evaporator 8 has a steam channel to communicate with the second expander 2, the second expansion The engine 2 also has a steam channel connected with the high temperature heat exchanger 7, the high temperature heat exchanger 7 has an intermediate steam channel connected with the fourth expander 12, and the high temperature heat exchanger 7 has a steam channel connected with the expander 1; high temperature heat exchange The device 7 also has a heat source medium channel communicating with the outside, the high-temperature evaporator 8 has a heat source medium channel communicating with the outside, the condenser 9 has a cooling medium channel communicating with the outside, and the expander 1 and the fourth expander 12 are connected to the compressor 3 and Transmission power.

(2) In the process, the first condensate of the condenser 9 is boosted by the circulating pump 5 into the mixing evaporator 10, mixed with the low-pressure steam from the high-temperature evaporator 8, absorbs heat and rises up and vaporizes into saturated or superheated steam. Divided into two paths-the first path enters the compressor 3 to increase the pressure and then enters the high temperature heat exchanger 7 to absorb heat and increase the temperature, and the second path flows through the third expander 4 to reduce pressure and then enter the condenser 9 to release heat and condense; The second condensate of the condenser 9 is boosted by the second circulating pump 6 into the high-temperature evaporator 8, absorbs heat, increases, vaporizes and overheats, flows through the second expander 2 to reduce pressure, and then enters the high-temperature heat exchanger 7 Heat absorption and temperature rise; the steam entering the high-temperature heat exchanger 7 absorbs heat and rises to a certain level and then divides into two paths-the first path is provided to the fourth expander 12 through the middle steam passage of the high-temperature heat exchanger 7 for pressure reduction work. After the second path continues to absorb heat and increase its temperature, it enters the expander 1 to reduce pressure; the low-pressure steam discharged from the fourth expander 12 and the expander 1 flows through the high-temperature evaporator 8 to release heat and cools, and then is supplied to the hybrid evaporator 10, and from the circulation The condensate of the pump 5 mixes to release heat and cools; the heat source medium passes through the high temperature heat exchanger 7 and the high temperature evaporator 8 to provide driving heat load, and the cooling medium passes through the condenser 9 to take away the low temperature heat load; expander 1 and fourth expander 12 The compressor 3 is provided with power, and the expander 1, the second expander 2, the third expander 4, and the fourth expander 12 provide power to the outside to form a combined cycle power plant.

The combined cycle power plant shown in Figure 4/8 is implemented as follows:

(1) In terms of structure, it is mainly composed of expander, second expander, compressor, third expander, circulating pump, second circulating pump, high temperature heat exchanger, high temperature evaporator, condenser, mixed evaporator, supply The condenser 9 has a condensate pipeline connected to the mixing evaporator 10 through the circulating pump 5, and the expander 1 has a low-pressure steam channel through the high-temperature evaporator 8 and the heat supply 11 and the mixing evaporator. 10 is connected, the fourth expander 12 has a low-pressure steam passage that communicates with the mixing evaporator 10 through the high-temperature evaporator 8 and the heat supply 11, and the mixing evaporator 10 also has a low-pressure steam passage that directly communicates with the compressor 3 and through the third expansion. The machine 4 is connected with the condenser 9, the compressor 3 has a steam channel connected with the high-temperature heat exchanger 7, and the condenser 9 has a condensate pipeline connected with the high-temperature evaporator 8 through the second circulation pump 6 after the high-temperature evaporator 8 is connected again. There is a steam passage communicating with the second expander 2, the second expander 2 also has a steam passage communicating with the high temperature heat exchanger 7, and the high temperature heat exchanger 7 also has an intermediate steam passage communicating with the fourth expander 12. 7 also has a steam channel connected to the expander 1; the high temperature heat exchanger 7 has a heat source medium channel connected to the outside, the high temperature evaporator 8 has a heat source medium channel connected to the outside, and the condenser 9 has a cooling medium channel connected to the outside. The heater 11 also has a heated medium channel communicating with the outside, and the expander 1 and the fourth expander 12 are connected to the compressor 3 and transmit power.

(2) In the process, the first condensate of the condenser 9 is boosted by the circulating pump 5 into the mixing evaporator 10, mixed with the low-pressure steam from the heater 11, absorbing heat and increasing temperature and vaporizing into saturated or superheated steam. Divided into two paths-the first path enters the compressor 3 to increase the pressure and then enters the high temperature heat exchanger 7 to absorb heat and increase the temperature, and the second path flows through the third expander 4 to reduce pressure and then enter the condenser 9 to release heat and condense; The second condensate of the condenser 9 is boosted by the second circulating pump 6 into the high-temperature evaporator 8, absorbs heat, increases, vaporizes and overheats, flows through the second expander 2 to reduce pressure, and then enters the high-temperature heat exchanger 7 Heat absorption and temperature rise; the steam entering the high-temperature heat exchanger 7 absorbs heat and rises to a certain level and then divides into two paths-the first path is provided to the fourth expander 12 through the middle steam passage of the high-temperature heat exchanger 7 for pressure reduction work. After the second path continues to absorb heat and increase its temperature, it enters the expander 1 to reduce the pressure to perform work; the low pressure steam discharged from the fourth expander 12 and the expander 1 flows through the high temperature evaporator 8 and the heater 11 to gradually release heat and cool down, and then provide it to The mixed evaporator 10 mixes with the condensate from the circulating pump 5 to release heat and cools; the heat source medium passes through the high temperature heat exchanger 7 and the high temperature evaporator 8 to provide driving heat load, and the cooling medium passes through the condenser 9 to take away the low temperature heat load and is The heating medium takes away the medium temperature heat load through the heater 11; the expander 1 and the fourth expander 12 provide power to the compressor 3, the expander 1, the second expander 2, the third expander 4 and the fourth expander 12 Provide power to the outside to form a combined cycle power plant.

The combined cycle power plant shown in Figure 5/8 is implemented as follows:

(1) Structurally, it is mainly composed of expander, second expander, compressor, third expander, circulating pump, second circulating pump, high temperature heat exchanger, high temperature evaporator, condenser, hybrid evaporator and high temperature The condenser 9 has a condensate pipeline connected to the mixing evaporator 10 via a circulating pump 5, and the expander 1 has a low-pressure steam channel connected to the mixing evaporator 10 via a high-temperature recuperator 13 and a high-temperature evaporator 8, The mixing evaporator 10 also has a low-pressure steam channel directly connected with the compressor 3 and connected with the condenser 9 via the third expander 4, and the compressor 3 has a steam channel connected with the high-temperature heat exchanger 7 via the high-temperature regenerator 13, respectively. The condenser 9 also has a condensate pipeline connected to the high-temperature evaporator 8 through the second circulating pump 6. After the high-temperature evaporator 8 has a steam passage connected with the second expander 2, the second expander 2 also has a steam passage through the high temperature return The heat exchanger 13 is connected to the high temperature heat exchanger 7, and the high temperature heat exchanger 7 also has a steam channel connected to the expander 1; the high temperature heat exchanger 7 also has a heat source medium channel connected to the outside, and the high temperature evaporator 8 also has a heat source medium channel connected to the outside. The condenser 9 also has a cooling medium channel to communicate with the outside, and the expander 1 is connected to the compressor 3 and transmits power.

(2) In the process, the first condensate of the condenser 9 is boosted by the circulating pump 5 into the mixing evaporator 10, mixed with the low-pressure steam from the high-temperature evaporator 8, absorbs heat and rises up and vaporizes into saturated or superheated steam. Divided into two paths—the first path enters the compressor 3 to increase the pressure, the second path flows through the third expander 4 to reduce pressure and then enters the condenser 9 to release heat and condense; the second path of condensate in the condenser 9 passes through The second circulating pump 6 boosts pressure and enters the high-temperature evaporator 8, absorbs heat to increase temperature, vaporizes and overheats, flows through the second expander 2 to reduce pressure and performs work, and flows through the high-temperature regenerator 13 to absorb heat and increase temperature, and then enters the high-temperature heat exchanger 7 Heat absorption and temperature rise; the steam discharged from the compressor 3 flows through the high-temperature regenerator 13 to absorb heat and heat up, and then enters the high-temperature heat exchanger 7 to absorb heat and heat up; the steam discharged from the high-temperature heat exchanger 7 flows through the expander 1 to perform work , The low-pressure steam discharged from the expander 1 flows through the high-temperature regenerator 13 and the high-temperature evaporator 8 to gradually release heat and cool down, and then enters the hybrid evaporator 10 to release heat and cool down; the heat source medium is provided by the high-temperature heat exchanger 7 and the high-temperature evaporator 8. Drive the heat load, the cooling medium takes away the low temperature heat load through the condenser 9, the expander 1 provides power to the compressor 3, and the expander 1, the second expander 2 and the third expander 4 provide power to the outside to form a combined cycle power Device.

The combined cycle power plant shown in Figure 6/8 is implemented as follows:

(1) In terms of structure, it is mainly composed of expander, second expander, compressor, third expander, circulating pump, second circulating pump, high temperature heat exchanger, high temperature evaporator, condenser, mixed evaporator, supply Heater and high-temperature regenerator; condenser 9 has a condensate pipeline connected to mixing evaporator 10 via circulating pump 5, expander 1 has a low-pressure steam channel through high-temperature regenerator 13, high-temperature evaporator 8 and heat supply The mixer 11 is in communication with the mixing evaporator 10. The mixing evaporator 10 also has a low-pressure steam passage directly connected with the compressor 3 and connected with the condenser 9 via the third expander 4, and the compressor 3 has a steam passage via a high-temperature regenerator. 13 is connected to the high-temperature heat exchanger 7, and the condenser 9 also has a condensate pipeline connected to the high-temperature evaporator 8 through the second circulating pump 6. After the high-temperature evaporator 8 has a steam channel to communicate with the second expander 2, the second expansion The engine 2 also has a steam channel connected to the high temperature heat exchanger 7 through the high temperature regenerator 13, and the high temperature heat exchanger 7 has a steam channel connected to the expander 1; the high temperature heat exchanger 7 also has a heat source medium channel connected to the outside. The evaporator 8 also has a heat source medium channel to communicate with the outside, the condenser 9 also has a cooling medium channel to communicate with the outside, the heater 11 also has a heated medium channel to communicate with the outside, and the expander 1 is connected to the compressor 3 and transmits power.

(2) In the process, the first condensate of the condenser 9 is boosted by the circulating pump 5 into the mixing evaporator 10, mixed with the low-pressure steam from the heater 11, absorbing heat and increasing temperature and vaporizing into saturated or superheated steam. Divided into two paths—the first path enters the compressor 3 to increase the pressure, the second path flows through the third expander 4 to reduce pressure and then enters the condenser 9 to release heat and condense; the second path of condensate in the condenser 9 passes through The second circulating pump 6 boosts pressure and enters the high-temperature evaporator 8, absorbs heat to increase temperature, vaporizes and overheats, flows through the second expander 2 to reduce pressure and performs work, and flows through the high-temperature regenerator 13 to absorb heat and increase temperature, and then enters the high-temperature heat exchanger 7 Heat absorption and temperature rise; the steam discharged from the compressor 3 flows through the high-temperature regenerator 13 to absorb heat and heat up, and then enters the high-temperature heat exchanger 7 to absorb heat and heat up; the steam discharged from the high-temperature heat exchanger 7 flows through the expander 1 to perform work , The low-pressure steam discharged from the expander 1 flows through the high-temperature regenerator 13, the high-temperature evaporator 8 and the heat supply 11 to gradually release heat and cool down, and then enter the mixed evaporator 10 to release heat and cool down; the heat source medium passes through the high-temperature heat exchanger 7 and The high temperature evaporator 8 provides driving heat load, the cooling medium takes away the low temperature heat load through the condenser 9, and the heated medium takes away the medium temperature heat load through the heater 11, the expander 1 provides power to the compressor 3, and the expander 1, The second expander 2 and the third expander 4 provide power to the outside to form a combined cycle power plant.

The combined cycle power plant shown in Figure 7/8 is implemented as follows:

(1) Structurally, in the combined cycle power plant shown in Figure 1/8, add a low-temperature regenerator and a third circulating pump, and connect the condenser 9 with a condensate pipeline to the mixed evaporator 10 via the circulating pump 5 It is adjusted that the condenser 9 has a condensate pipeline connected to the low-temperature regenerator 14 via the circulating pump 5, the compressor 3 is additionally provided with an intermediate extraction channel to communicate with the low-temperature regenerator 14, and the low-temperature regenerator 14 has a condensate pipeline through The third circulation pump 15 is in communication with the mixing evaporator 10.

(2) In the process, the condensate of the condenser 9 is boosted by the circulating pump 5 into the low-temperature regenerator 14, mixed with the extraction steam from the compressor 3 to absorb heat and increase the temperature. After the extraction steam is mixed with the condensate, it releases heat and condenses ; The condensate of the low-temperature regenerator 14 is boosted by the third circulating pump 15 into the mixing evaporator 10, mixed with the low-pressure steam from the high-temperature evaporator 8, absorbs heat to increase temperature and vaporizes into saturated or superheated steam, and then divides into two— —The first path enters the compressor 3, the second path flows through the third expander 4 to reduce pressure and then enters the condenser 9 to release heat and condense; the low-pressure steam entering the compressor 3 is increased to a certain extent and then divided into two Road-the first path enters the low-temperature regenerator 14 through the middle extraction channel to release heat and condense, and the second path continues to increase in pressure; the second path condensate in the condenser 9 is boosted by the second circulating pump 6 to enter the high-temperature evaporation The device 8, which absorbs heat to increase temperature, vaporizes, and overheats, flows through the second expander 2 to reduce pressure, and then enters the high-temperature heat exchanger 7 to absorb heat and increase the temperature. The steam discharged from the compressor 3 enters the high-temperature heat exchanger 7 to absorb heat and increase the temperature. The steam discharged from the high-temperature heat exchanger 7 flows through the expander 1 to reduce pressure; the low-pressure steam discharged from the expander 1 flows through the high-temperature evaporator 8 to release heat and cool down, and then enters the mixed evaporator 10 to release heat and cool down; the heat source medium passes through the high temperature The heat exchanger 7 and the high temperature evaporator 8 provide driving heat load, the cooling medium takes away the low temperature heat load through the condenser 9, the expander 1 provides power to the compressor 3, the expander 1, the second expander 2 and the third expander 4 Provide power to the outside to form a combined cycle power plant.

The combined cycle power plant shown in Figure 8/8 is implemented as follows:

(1) Structurally, in the combined cycle power plant shown in Figure 1/8, a new regenerator and a new circulating pump are added, and the condenser 9 has a condensate pipeline through the second circulating pump 6 and high temperature evaporation The communication of the condenser 8 is adjusted so that the condensate pipeline of the condenser 9 is connected to the newly added heat regenerator A through the second circulating pump 6, and the compressor 3 is provided with an additional intermediate extraction channel to communicate with the newly added heat regenerator A, and the newly added heat regenerator A condensate pipeline is connected to the high temperature evaporator 8 through the newly added circulating pump B.

(2) In the process, the first condensate of the condenser 9 is boosted by the circulating pump 5 into the mixing evaporator 10, mixed with the low-pressure steam from the high-temperature evaporator 8, absorbs heat and rises up and vaporizes into saturated or superheated steam. Divided into two paths-the first path enters the compressor 3, the second path flows through the third expander 4 to reduce pressure and then enters the condenser 9 to release heat and condense; the low pressure steam entering the compressor 3 is increased in pressure to a certain degree After that, it is divided into two paths—the first path enters the newly added regenerator A through the middle extraction channel to release heat and condense, and the second path continues to increase in pressure and temperature; the second path condensate of the condenser 9 passes through the second circulating pump 6 The pressure is increased and enters the newly-added regenerator A, mixed with the extraction steam from the compressor 3 to absorb heat and heat up. After the extraction steam is mixed with the condensate, it releases heat and condenses; the condensate of the newly-added regenerator A is passed through the new circulating pump B is boosted into the high-temperature evaporator 8, absorbs heat to increase temperature, vaporizes and overheats, flows through the second expander 2 to reduce pressure, and then enters the high-temperature heat exchanger 7 to absorb heat and increase, and the steam discharged from the compressor 3 enters the high-temperature heat exchange The high-temperature heat exchanger 7 absorbs heat and heats up, and the steam discharged from the high-temperature heat exchanger 7 flows through the expander 1 to reduce pressure; the low-pressure steam discharged from the expander 1 flows through the high-temperature evaporator 8 to release heat and cool down, and then enters the mixed evaporator 10 to release heat and perform work. Cooling; heat source medium provides driving heat load through high temperature heat exchanger 7 and high temperature evaporator 8, cooling medium takes away low temperature heat load through condenser 9, expander 1 provides power to compressor 3, expander 1, second expander 2 and the third expander 4 provide power to the outside to form a combined cycle power plant.

Effects that can be achieved by the technology of the present invention-the combined cycle power plant proposed by the present invention has the following effects and advantages:

(1) The circulating working fluid completes high temperature heat absorption under low pressure, and the temperature difference loss between the circulating working fluid and the high temperature heat source is small, which is beneficial to improve the thermal efficiency of the system and the safety of the device.

(2) The circulating working fluid mainly relies on the condensation phase change process to realize low-temperature heat release, and the temperature difference loss between the circulating working fluid and the environment is controllable, which is beneficial to improve thermal efficiency.

(3) Adopt low-pressure and high-temperature operation in the high-temperature zone to solve the difficult to reconcile contradiction between thermal efficiency, circulating medium parameters and pipe pressure and temperature resistance in traditional steam power plants, thereby greatly reducing the temperature difference between the heat source and the circulating medium Loss, greatly improve thermal efficiency.

(4) The equipment is shared to increase the heat absorption process of the bottom cycle-Rankine cycle and improve thermal efficiency.

(5) Adopt a single working fluid to reduce operating costs and improve the flexibility of thermodynamic device adjustment.

(6) Sharing high-temperature expanders and reducing the number of core equipment is conducive to reducing system investment and improving thermal efficiency.

(7) It can effectively cope with high-temperature heat sources and variable-temperature heat sources, cope with high-quality fuels and non-high-quality fuels, and has a wide range of applications.

(8) Under the premise of realizing high thermal efficiency, low-voltage operation can be selected, which greatly improves the safety of the device operation.

(9) The heat recovery of enterprise installations can be realized simply, actively, safely and efficiently.

(10) It is applied to the lower end of the gas-steam combined cycle, which can effectively improve its thermal efficiency.

(11) When applied to a coal-fired thermal system, it can maintain the original advantages of the traditional steam power cycle-water vapor as the working medium, and a wide range of working parameters; according to actual conditions, you can choose to work in subcritical, critical, supercritical or ultra Supercritical state, etc.

Claims

Combined cycle power plant, mainly composed of expander, second expander, compressor, third expander, circulating pump, second circulating pump, high temperature heat exchanger, high temperature evaporator, condenser and mixed evaporator; condensation The condenser (9) is connected with the mixing evaporator (10) through the circulating pump (5), and the expander (1) has a low-pressure steam channel connected with the mixing evaporator (10) through the high-temperature evaporator (8). The evaporator (10) also has a low-pressure steam channel directly connected with the compressor (3) and connected with the condenser (9) via the third expander (4), and the compressor (3) has a steam channel and a high-temperature heat exchanger. (7) Connect, the condenser (9) and the condensate pipeline are connected with the high-temperature evaporator (8) through the second circulating pump (6), and then the high-temperature evaporator (8) has a steam channel and a second expander (2). ) Is connected, the second expander (2) has a steam channel connected with the high temperature heat exchanger (7), the high temperature heat exchanger (7) has a steam channel connected with the expander (1); the high temperature heat exchanger (7) There is also a heat source medium channel connected to the outside, a high temperature evaporator (8) or a heat source medium channel connected to the outside, a condenser (9) also has a cooling medium channel connected to the outside, a mixed evaporator (10) or a heat source medium The channel communicates with the outside, the expander (1) is connected to the compressor (3) and transmits power to form a combined cycle power plant; among them, or the expander (1) is connected to the compressor (3), the circulating pump (5) and the second cycle Pump (6) and transmit power.
Combined cycle power plant, mainly composed of expander, second expander, compressor, third expander, circulating pump, second circulating pump, high temperature heat exchanger, high temperature evaporator, condenser, hybrid evaporator and heat supply The condenser (9) has a condensate pipeline connected to the mixing evaporator (10) via a circulating pump (5), and the expander (1) has a low-pressure steam passage through a high-temperature evaporator (8) and a heat supply (11) ) Is connected to the mixing evaporator (10), the mixing evaporator (10) and the low-pressure steam channel are respectively directly connected to the compressor (3) and connected to the condenser (9) via the third expander (4), the compressor ( 3) There is also a steam channel connected to the high temperature heat exchanger (7), the condenser (9) and the condensate pipeline are connected to the high temperature evaporator (8) through the second circulation pump (6), and the high temperature evaporator (8) There is a steam channel connected with the second expander (2), the second expander (2) has a steam channel connected with the high temperature heat exchanger (7), and the high temperature heat exchanger (7) has a steam channel connected with the expander ( 1) Communication; the high temperature heat exchanger (7) also has a heat source medium channel connected to the outside, the high temperature evaporator (8) or a heat source medium channel communicates with the outside, and the condenser (9) also has a cooling medium channel connected with the outside, The mixed evaporator (10) or the heat source medium channel communicates with the outside, the heater (11) also has the heated medium channel communicates with the outside, the expander (1) connects the compressor (3) and transmits power to form a combined cycle Power plant; wherein, or expander (1) connects compressor (3), circulating pump (5) and second circulating pump (6) and transmits power.
Combined cycle power plant, mainly composed of expander, second expander, compressor, third expander, circulating pump, second circulating pump, high temperature heat exchanger, high temperature evaporator, condenser, mixed evaporator and fourth expansion The condenser (9) has a condensate pipeline connected to the mixing evaporator (10) via the circulating pump (5), and the expander (1) has a low-pressure steam channel through the high-temperature evaporator (8) and the mixing evaporator ( 10) is connected, the fourth expander (12) has a low-pressure steam passage that communicates with the mixing evaporator (10) through the high-temperature evaporator (8), and the mixing evaporator (10) also has a low-pressure steam passage directly connected to the compressor (3) The third expander (4) is connected to the condenser (9). The compressor (3) also has a steam channel to communicate with the high-temperature heat exchanger (7). The condenser (9) also has a condensate pipeline through the After the second circulation pump (6) is connected with the high temperature evaporator (8), the high temperature evaporator (8) has a steam channel to communicate with the second expander (2), and the second expander (2) also has a steam channel for high temperature heat exchange The high-temperature heat exchanger (7) is connected with the fourth expander (12), and the high-temperature heat exchanger (7) has a steam channel connected with the expander (1); high-temperature heat exchange The condenser (7) also has a heat source medium channel to communicate with the outside, a high temperature evaporator (8) or a heat source medium channel communicates with the outside, the condenser (9) also has a cooling medium channel to communicate with the outside, and the mixed evaporator (10) or There is also a heat source medium channel that communicates with the outside, and the expander (1) and the fourth expander (12) are connected to the compressor (3) and transmit power to form a combined cycle power plant; among them, or the expander (1) and the fourth expander The machine (12) connects the compressor (3), the circulation pump (5) and the second circulation pump (6) and transmits power.
Combined cycle power plant, mainly composed of expander, second expander, compressor, third expander, circulating pump, second circulating pump, high temperature heat exchanger, high temperature evaporator, condenser, hybrid evaporator, heat supply And the fourth expander; the condenser (9) has a condensate pipeline connected to the mixing evaporator (10) via the circulating pump (5), and the expander (1) has a low-pressure steam passage through the high-temperature evaporator (8) and The heat supply device (11) is connected with the mixing evaporator (10), and the fourth expander (12) has a low pressure steam passage through the high temperature evaporator (8) and the heat supply device (11) to communicate with the mixing evaporator (10). The evaporator (10) also has a low-pressure steam channel directly connected with the compressor (3) and connected with the condenser (9) via the third expander (4), and the compressor (3) has a steam channel and a high-temperature heat exchanger. (7) Connect, the condenser (9) and the condensate pipeline are connected with the high-temperature evaporator (8) through the second circulating pump (6), and then the high-temperature evaporator (8) has a steam channel and a second expander (2). ) Is connected, the second expander (2) also has a steam channel connected with the high temperature heat exchanger (7), the high temperature heat exchanger (7) has an intermediate steam channel connected with the fourth expander (12), the high temperature heat exchanger (7) There is also a steam channel connected to the expander (1); the high temperature heat exchanger (7) also has a heat source medium channel connected to the outside, the high temperature evaporator (8) or a heat source medium channel communicates with the outside, and the condenser ( 9) There is also a cooling medium channel communicating with the outside, a mixing evaporator (10) or a heat source medium channel communicating with the outside, a heater (11) and a heated medium channel communicating with the outside, the expander (1) and the first The four expander (12) is connected to the compressor (3) and transmits power to form a combined cycle power plant; among them, or the expander (1) and the fourth expander (12) are connected to the compressor (3) and the circulating pump (5) And the second circulating pump (6) and transmit power.
Combined cycle power plant, mainly composed of expander, second expander, compressor, third expander, circulating pump, second circulating pump, high temperature heat exchanger, high temperature evaporator, condenser, hybrid evaporator and high temperature heat recovery The condenser (9) has a condensate pipeline connected to the mixing evaporator (10) via a circulating pump (5), and the expander (1) has a low-pressure steam channel via a high-temperature regenerator (13) and a high-temperature evaporator (8) It is connected to the mixing evaporator (10). The mixing evaporator (10) and the low-pressure steam channel respectively directly communicate with the compressor (3) and communicate with the condenser (9) through the third expander (4). The machine (3) also has a steam passage that communicates with the high-temperature heat exchanger (7) through the high-temperature regenerator (13), and the condenser (9) also has a condensate pipeline through the second circulating pump (6) and the high-temperature evaporator ( 8) After the connection, the high-temperature evaporator (8) has a steam passage to communicate with the second expander (2), and the second expander (2) also has a steam passage through the high-temperature regenerator (13) and the high-temperature heat exchanger (7). ) Is connected, the high temperature heat exchanger (7) also has a steam channel connected with the expander (1); the high temperature heat exchanger (7) has a heat source medium channel connected to the outside, and the high temperature evaporator (8) or a heat source medium channel Connected with the outside, the condenser (9) also has a cooling medium channel to communicate with the outside, the mixed evaporator (10) or a heat source medium channel is connected with the outside, and the expander (1) is connected to the compressor (3) and transmits power to form Combined cycle power plant; wherein, or expander (1) connects compressor (3), circulating pump (5) and second circulating pump (6) and transmits power.
Combined cycle power plant, mainly composed of expander, second expander, compressor, third expander, circulating pump, second circulating pump, high temperature heat exchanger, high temperature evaporator, condenser, hybrid evaporator, heat supply The condenser (9) has a condensate pipeline connected to the mixing evaporator (10) via a circulating pump (5), and the expander (1) has a low-pressure steam channel via a high-temperature regenerator (13) , The high temperature evaporator (8) and the heat supply (11) are connected with the mixing evaporator (10), and the mixing evaporator (10) and the low pressure steam channel are directly connected with the compressor (3) and through the third expander ( 4) It is connected to the condenser (9), the compressor (3) and the steam passage are connected to the high-temperature heat exchanger (7) through the high-temperature regenerator (13), and the condenser (9) also has a condensate pipeline through the first After the second circulation pump (6) is connected with the high temperature evaporator (8), the high temperature evaporator (8) has a steam passage to communicate with the second expander (2), and the second expander (2) also has a steam passage through high temperature heat recovery The high temperature heat exchanger (13) is connected with the high temperature heat exchanger (7). The high temperature heat exchanger (7) also has a steam channel connected with the expander (1); the high temperature heat exchanger (7) also has a heat source medium channel connected with the outside. The evaporator (8) or the heat source medium channel communicates with the outside, the condenser (9) also has a cooling medium channel communicates with the outside, the mixed evaporator (10) or the heat source medium channel communicates with the outside, the heat supply (11) ) And the heated medium channel communicates with the outside, the expander (1) is connected to the compressor (3) and transmits power to form a combined cycle power plant; among them, or the expander (1) is connected to the compressor (3) and the circulating pump ( 5) and the second circulating pump (6) and transmit power.
The combined cycle power plant is to add a low-temperature regenerator and a third circulating pump to any one of the combined cycle power plants described in claims 1-6, and connect the condenser (9) with a condensate pipeline through the circulating pump (5) It is connected with the mixing evaporator (10) and adjusted so that the condenser (9) has a condensate pipeline connected with the low-temperature regenerator (14) via the circulating pump (5), and the compressor (3) is provided with an intermediate extraction channel and The low-temperature regenerator (14) is connected, and the low-temperature regenerator (14) has a condensate pipeline connected with the mixing evaporator (10) through the third circulation pump (15) to form a combined cycle power plant.
The combined cycle power plant is a combined cycle power plant of any one of claims 1-7, adding a new regenerator and a new circulating pump, and the condenser (9) has a condensate pipeline through the first The second circulation pump (6) is connected with the high temperature evaporator (8) and adjusted to the condenser (9) with a condensate pipeline connected to the new regenerator (A) via the second circulation pump (6), and the compressor (3) The additional intermediate extraction channel is connected to the new regenerator (A), the new regenerator (A) and the condensate pipeline are connected to the high temperature evaporator (8) through the new circulation pump (B) to form a combined cycle powerplant.