CN220321414U - Heat supply steam system based on hot water conveying - Google Patents
Heat supply steam system based on hot water conveying Download PDFInfo
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Abstract
The utility model discloses a heat supply steam system based on hot water delivery, which relates to the technical field of power generation and comprises a heat supply user side pipeline, a steam extraction and backheating pipeline and a heat supply working medium heating pipeline, wherein a heater in the heat supply user side pipeline is connected with a delivery pipe network outlet and a desuperheater steam inlet, the desuperheater steam outlet is connected with a heat supply user, and a first regulating valve is connected with the delivery pipe network outlet and the desuperheater water inlet; the low-pressure condensate water at the outlet of the deaerator in the steam extraction backheating pipeline is pressurized by a pre-pump and a water supply pump and then enters a high-pressure heater for heating, and the heated water supply enters a boiler for continuous heating; the heat supply working medium from the steam extraction and heat recovery pipeline is heated by the heat recovery steam extraction A in the hybrid heater A after being boosted by the booster pump A, and is sent to the heat supply user side pipeline in a hot water form through the conveying pipe network after being boosted by the booster pump. According to the utility model, the hot water is heated at the user side to generate steam, so that the pressure loss and temperature drop in a heating pipe network are effectively overcome, the investment and operation cost are reduced, and the safety and the economical efficiency are improved.
Description
Technical Field
The utility model relates to the technical field of power generation, in particular to a heat supply steam system based on hot water conveying.
Background
When the unit supplies heat to the outside, the heat supply steam source needs to be decompressed and cooled to obtain heat supply steam meeting certain pressure and temperature parameters, and then the heat supply steam is supplied to a heat supply user. For the heating steam demand of high pressure and large flow (such as 5MPa, 400 ℃ and 400 t/h), on the premise that a unit has to respond to the wide load range operation of the power grid depth peak regulation and a high-pressure cylinder does not develop a new steam extraction port or perform large-scale reconstruction of expanding the existing steam extraction port, main steam is often selected as a heating steam source, after the pressure is reduced through a regulating valve, the water supply at the outlet of a high-pressure heater is selected as the temperature reduction water for temperature reduction, and thus, the main steam is decompressed and cooled to obtain heating steam with certain parameters.
Aiming at the requirements of high pressure and large flow of heat supply steam, such as 5MPa, 400 ℃ and 400t/h, the heat supply steam source of the existing unit is limited. On the premise that the unit has to respond to the wide load range operation of the deep peak shaving of the power grid and the high-pressure cylinder does not develop a newly increased steam extraction port or does not develop large-scale capacity expansion transformation on the existing steam extraction port, main steam which does not work in a steam turbine is often selected as a heat supply steam source, and the heat supply economy is poor. Meanwhile, when the main steam is used as a heat supply steam source, when the heat supply steam amount is large, the heat absorption amount of the reheat steam for the primary or secondary reheat unit is obviously increased. Because the reheating air temperature adjusting means is limited, and the excessive use of the reheating and dehumidifying water can obviously reduce the running economy of the unit, the heating surfaces including the reheater and the like in the boiler can be subjected to large-scale adaptive transformation, the transformation cost is quite huge, and the heating surfaces including the reheater and the like in the boiler face the dilemma of serious mismatch of heat absorption under the extreme working condition that the heating steam quantity is temporarily reduced or even stopped.
In addition, for the transportation pipe network system of steam, if the pressure loss of the steam is reduced on the premise that the heat supply steam source is determined, the pipe diameter of the conveying pipeline is required to be enlarged, the investment cost of the pipeline system is obviously increased for high-temperature and high-pressure pipelines, the requirement on the pipeline arrangement space is more severe, and the safety and the economy of the heat supply operation of the unit face a certain degree of challenges.
Therefore, under the operating condition of a wide load range, how to meet the requirements of stable high-pressure and large-flow heat supply steam, overcome the pressure loss and temperature drop of the heat supply steam conveyed to a user side through a pipeline system, reduce the investment and operating cost of high-pressure and high-temperature pipelines, and improve the heat supply operation safety and economy of the unit, and become the problem to be solved urgently.
Accordingly, those skilled in the art have been working to develop a heating steam system based on hot water delivery.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the present utility model aims to solve the technical problems of how to meet the requirements of stable high-pressure and large-flow heat-supply steam, overcome the pressure loss temperature drop of the heat-supply steam delivered to the user side through the pipeline system, reduce the investment and operation cost of the high-pressure and high-temperature pipeline, and improve the safety and economical efficiency of heat-supply operation of the unit.
In order to achieve the aim, the utility model provides a heat supply steam system based on hot water delivery, which is characterized by comprising a heat supply user side pipeline, a steam extraction and heat recovery pipeline and a heat supply working medium heating pipeline, wherein,
the heat supply user side pipeline is provided with a heater, a desuperheater and a first regulating valve, one end of the heater is connected with an outlet of a conveying pipe network, the other end of the heater is connected with a steam inlet of the desuperheater, a steam outlet of the desuperheater is connected with a heat supply user, one end of the first regulating valve is connected with an outlet of the conveying pipe network, and the other end of the first regulating valve is connected with a desuperheater water inlet;
the low-pressure condensate water at the outlet of the deaerator sequentially passes through the pre-pump and the water feeding pump to be pressurized and then enters the high-pressure heater to be heated, the heated water fed enters the boiler to be continuously heated, and finally main steam is obtained to enter the steam turbine to work;
the heat supply working medium heating pipeline is provided with a booster pump A, a hybrid heater A, a booster pump, a second regulating valve and a conveying pipe network, the heat supply working medium from the steam extraction and heat recovery pipeline is boosted by the booster pump A and then is fully mixed with the heat recovery steam extraction A in the hybrid heater A for heating, the heat recovery steam extraction A is boosted by the booster pump and is conveyed to a heat supply user side pipeline in a hot water mode through the conveying pipe network, and the heat recovery steam extraction A is controlled by the second regulating valve.
Further, the heat supply working medium is low-pressure condensate water between the deaerator and the pre-pump.
Further, the booster pump A adopts a variable frequency operation mode, and at least one high-pressure heater is arranged.
Further, the heater of the heat supply user side pipeline is an electric heater or a gas heater.
Further, the heating medium heating pipeline is further provided with a booster pump B, a hybrid heater B and a third regulating valve, one end of the booster pump B is connected with the hybrid heater A, the other end of the booster pump B is connected with the hybrid heater B, the other end of the hybrid heater B is connected with the booster pump, and the heating medium is subjected to regenerative heating through the regenerative extraction B of the third regulating valve.
Further, the heat supply working medium heating pipeline is further provided with a backheating extraction B, a backheating heater B and a heat exchanger, wherein the heat exchanger is connected with the booster pump and the conveying pipe network, and the heat supply working medium is further heated by utilizing the superheat degree of the backheating extraction B.
Further, the heating working medium source is replaced by the low-pressure condensate water between the deaerator and the pre-pump, and the medium-pressure water between the pre-pump and the water supply pump.
Further, the pre-pump is independently electric, rated outlet pressure of the pre-pump is higher than heat supply and steam extraction pressure, and the booster pump A is replaced by a fourth regulating valve.
Further, the heating working medium source is replaced by the low-pressure condensate water between the deaerator and the pre-pump to be drained by a high-pressure heater, and the drain of the high-pressure heater is normal drain or critical drain.
Further, the heat supply working medium heating pipeline cancels a heat recovery heating device for the heat supply working medium, and the heat recovery heating device comprises a booster pump A, a hybrid heater A, a second regulating valve and a heat recovery steam extraction A.
In the preferred embodiment of the present utility model, compared with the prior art, the present utility model has the following beneficial effects:
1. the utility model relates to a heating steam system based on hot water conveying, which takes low-pressure condensate water and the like as working medium sources, after the processes of boosting, heating and the like, hot water meeting the pressure requirement of the heating steam is obtained at a unit end and then conveyed to a user end, and heating is continuously carried out in heating equipment at the user end, so that the heating steam meeting the requirement is finally obtained, the specific volume of the superheated steam and unsaturated water under the same pressure is far greater than that of the unsaturated water, and the flow area of a pipeline required by the former is far greater than that of the latter under the same flow rate;
2. the utility model uses the mode that the unit end provides hot water and then continues to heat to generate steam to the user end, effectively overcomes the pressure loss and temperature drop of the heat supply steam transmitted to the user side through the pipeline system, reduces the investment and operation cost of high-pressure high-temperature pipelines, avoids large-scale reconstruction of boilers and steam turbines, well adapts to the operation of the unit in response to the wide load range of the deep peak regulation of the power grid, and improves the heat supply operation safety and economy of the unit.
The conception, specific structure, and technical effects of the present utility model will be further described with reference to the accompanying drawings to fully understand the objects, features, and effects of the present utility model.
Drawings
FIG. 1 is a schematic diagram of a heating steam system based on hot water delivery according to a preferred embodiment of the present utility model;
FIG. 2 is a schematic diagram of another heating steam system based on hot water delivery according to a preferred embodiment of the present utility model;
FIG. 3 is a schematic diagram of another heating steam system based on hot water delivery according to a preferred embodiment of the present utility model;
FIG. 4 is a schematic diagram of another heating steam system based on hot water delivery according to a preferred embodiment of the present utility model;
FIG. 5 is a schematic diagram of another heating steam system based on hot water delivery according to a preferred embodiment of the present utility model;
FIG. 6 is a schematic diagram of another heating steam system based on hot water delivery according to a preferred embodiment of the present utility model;
FIG. 7 is a schematic diagram of another heating steam system based on hot water delivery according to a preferred embodiment of the present utility model;
fig. 8 is a schematic diagram of a heating steam system using main steam as a steam source in the prior art.
Detailed Description
The following description of the preferred embodiments of the present utility model refers to the accompanying drawings, which make the technical contents thereof more clear and easy to understand. The present utility model may be embodied in many different forms of embodiments and the scope of the present utility model is not limited to only the embodiments described herein.
In the drawings, like structural elements are referred to by like reference numerals and components having similar structure or function are referred to by like reference numerals. The dimensions and thickness of each component shown in the drawings are arbitrarily shown, and the present utility model is not limited to the dimensions and thickness of each component. The thickness of the components is exaggerated in some places in the drawings for clarity of illustration.
As shown in fig. 8, in a conventional heating steam system using main steam as a steam source, low-pressure condensate water at an outlet of a deaerator is pressurized by a pre-pump and a water supply pump in sequence and then enters a high-pressure heater for heating, and the heated water supply enters a boiler for continuous heating, so that the main steam is finally obtained and enters a steam turbine for working. After the pressure of part of the main steam is reduced through the regulating valve, the water supply at the outlet of the high-pressure heater is selected as the temperature-reducing water for temperature reduction, so that the main steam is subjected to pressure reduction and temperature reduction to obtain heat supply steam with certain parameters.
In the existing heat supply steam system taking main steam as a steam source, the heat supply steam source of the existing unit is limited in selection aiming at the heat supply steam requirements of high pressure and large flow, such as 5MPa, 400 ℃ and 400t/h. On the premise that the unit has to respond to the wide load range operation of the deep peak shaving of the power grid and the high-pressure cylinder does not develop a newly increased steam extraction port or does not develop large-scale capacity expansion transformation on the existing steam extraction port, main steam which does not work in a steam turbine is often selected as a heat supply steam source, and the heat supply economy is poor. Meanwhile, main steam is used as a heat supply steam source: when the amount of heating steam is large, the heat absorption capacity of the reheat steam will be significantly increased for the primary or secondary reheat units. Because the reheating air temperature adjusting means is limited, and the excessive use of the reheating and dehumidifying water can obviously reduce the running economy of the unit, the heating surfaces including the reheater and the like in the boiler can be subjected to large-scale adaptive transformation, the transformation cost is quite huge, and the heating surfaces including the reheater and the like in the boiler face the dilemma of serious mismatch of heat absorption under the extreme working condition that the heating steam quantity is temporarily reduced or even stopped. In addition, for the transportation pipe network system of steam, if the pressure loss of the steam is reduced on the premise that the heat supply steam source is determined, the pipe diameter of the conveying pipeline is required to be enlarged, the investment cost of the pipeline system is obviously increased for high-temperature and high-pressure pipelines, the requirement on the pipeline arrangement space is more severe, and the safety and the economy of the heat supply operation of the unit face a certain degree of challenges.
Therefore, under the operating condition of a wide load range, how to meet the requirements of stable high-pressure and large-flow heat supply steam, overcome the pressure loss and temperature drop of the heat supply steam conveyed to a user side through a pipeline system, reduce the investment and operating cost of high-pressure and high-temperature pipelines, and improve the heat supply operation safety and economy of the unit, and become the problem to be solved urgently.
The heat supply steam system based on hot water delivery uses low-pressure condensate water and the like as working medium sources, and after processes of boosting, heating and the like, hot water meeting the pressure requirement of the heat supply steam is obtained at a unit end and then delivered to a user end, and heating is continuously carried out in heating equipment at the user end, so that the heat supply steam meeting the requirement is finally obtained. Wherein, the superheated steam and unsaturated water under the same pressure have the specific volume far larger than that of the water under the same flow rate, and the flow area of the pipeline required by the former is far larger than that of the water under the same flow rate. The related independent booster pump can adopt a variable frequency operation mode, so that the pressure of the heat supply working medium after boosting is kept stable when the unit operation load changes.
As shown in fig. 1, a heating steam system based on hot water delivery according to a preferred embodiment of the present utility model includes a heating user side pipeline, a steam extraction and heat recovery pipeline, and a heating medium heating pipeline, wherein,
the heat supply user side pipeline is provided with a heater, a desuperheater and a first regulating valve, one end of the heater is connected with an outlet of the conveying pipe network, the other end of the heater is connected with a steam inlet of the desuperheater, the steam outlet of the desuperheater is connected with a heat supply user, one end of the first regulating valve is connected with an outlet of the conveying pipe network, and the other end of the first regulating valve is connected with a desuperheater water inlet; the heater is preferably an electric heater or a gas heater.
The low-pressure condensate water at the outlet of the deaerator sequentially passes through the pre-pump and the water feeding pump to be pressurized and then enters the high-pressure heater to be heated, the heated water fed enters the boiler to be continuously heated, and finally, main steam is obtained to enter the steam turbine to perform work. Preferably, the high pressure heater is at least one.
The heat supply working medium heating pipeline is provided with a booster pump A, a hybrid heater A, a booster pump, a second regulating valve and a conveying pipe network, the heat supply working medium from the steam extraction and heat recovery pipeline is boosted by the booster pump A and then is fully mixed with the heat recovery steam extraction A in the hybrid heater A for heating, the heat recovery steam extraction A is boosted by the booster pump and is conveyed to a heat supply user side pipeline in a hot water mode through the conveying pipe network, and the heat recovery steam extraction A is controlled by the second regulating valve. The heat working medium is low-pressure condensate water between the deaerator and the pre-pump, the booster pump A can adopt a variable-frequency operation mode, and the pressure of the pump after boosting the heat supply working medium is maintained stable when the unit operation load changes.
The utility model is used for replacing the existing heat supply scheme with main steam as a steam source, and adopts the mode that the unit end provides hot water and then continues to heat to generate steam to the user end, thereby effectively overcoming the pressure loss and temperature drop of the heat supply steam transmitted to the user side through a pipeline system, reducing the investment and operation cost of high-pressure high-temperature pipelines, avoiding the large-scale transformation of boilers and steam turbines, better adapting to the operation of the unit in response to the wide load range of the deep peak regulation of the power grid, and improving the heat supply operation safety and economy of the unit.
The heat supply steam system takes low-pressure condensate water between a deaerator and a pre-pump as a heat supply working medium source, after being boosted by a booster pump A, the low-pressure condensate water is fully mixed with backheating extraction A in a hybrid heater A for heating, then the backheating extraction A is boosted by the booster pump, and is sent to a heat supply user side in a hot water form through a conveying pipe network, and after the hot water enters the heater for further heating, part of hot water which is conveyed to the heat supply user side is selected as heat reduction water for temperature reduction; therefore, the low-pressure condensate water is subjected to the processes of boosting, heating and the like, hot water meeting the pressure requirement of the heating steam is obtained at the unit end and then is conveyed to the user end, and the heating steam with certain parameters is obtained by continuously heating in a heater at the user end. The booster pump boosts the hot water to offset the pressure loss of the hot water in the conveying pipe network and the heater and the pressure loss between the steam at the outlet of the heater and the heat supply user. In addition, the superheated steam and unsaturated water at the same pressure have much larger specific volume than the former, and the required pipe flow area is much larger than the latter at the same flow rate.
The present utility model will be described in detail with reference to preferred embodiments thereof.
Example 1
As shown in FIG. 1, in the heating steam system based on hot water delivery provided by the preferred embodiment of the utility model, low-pressure condensate water at the outlet of the deaerator is pressurized by the pre-pump and the water supply pump in sequence and then enters the high-pressure heater for heating, the heated water supply enters the boiler for continuous heating, and finally main steam is obtained and enters the steam turbine for working.
Meanwhile, low-pressure condensate water between the deaerator and the pre-pump is taken as a heat supply working medium source, after being boosted by the booster pump A, the mixed heater A is fully mixed and heated by backheating steam extraction A, then the mixed heater A is boosted by the booster pump, and is sent to a heat supply user side in a hot water form through a conveying pipe network, and after the mixed heater enters the heater for further heating, part of hot water which is sent to the heat supply user side is selected as temperature reduction water for temperature reduction; therefore, the low-pressure condensate water is subjected to the processes of boosting, heating and the like, hot water meeting the pressure requirement of the heating steam is obtained at the unit end and then is conveyed to the user end, and the heating steam with certain parameters is obtained by continuously heating in a heater at the user end.
In the preferred embodiment, the high pressure heater is at least one;
the booster pump A can adopt a variable frequency operation mode, so that the pressure of the pump after boosting the heat supply working medium is kept stable when the unit operation load changes;
the booster pump boosts the hot water to offset the pressure loss of the hot water in the conveying pipe network and the heater and the pressure loss between the steam at the outlet of the heater and the heat supply user.
The heater on the user side of the heat supply can be an electric heater, a gas heater, etc.
Compared with the prior art, the utility model has good beneficial effects. Taking the external heat supply of certain 1000MW unit THA working condition as an example, the heat supply steam parameter requirements are as follows: 5MPa, 400 ℃ and 400t/h.
The prior scheme is as follows: the main steam is 26.3MPa, 600 ℃, 347.3t/h, and the water is 31.9MPa, 294.3 ℃ and 52.3t/h.
Scheme of embodiment 1 of the utility model: low pressure condensed water 1.06MPa, 182.7 ℃, 335.3t/h, regenerative extraction A,5.8MPa, 365.7 ℃, 64.7t/h, hot water 5MPa, 263.9 ℃ and 400t/h at the outlet of the hybrid heater A. Compared with the prior art, the scheme of the embodiment 1 of the utility model has the advantages that the unit heat consumption benefit is 16.8 kJ/(kW.h).
Meanwhile, for a delivery pipe network system:
the prior scheme is as follows: when the steam is conveyed at the temperature of 400 ℃ under 5MPa and at the temperature of 400t/h, calculating the pipe diameter of a single pipe to DN800 and the pipe diameters of two pipes to DN600 according to the flow rate of 15 m/s;
scheme of embodiment 1 of the utility model: when the hot water is conveyed at the temperature of 5MPa and 263.9 ℃ and 400t/h, the pipe diameter of a single pipe is-DN 120, and the pipe diameters of two pipes are-DN 80 calculated according to the flow rate of 15 m/s.
Because the specific volume of the steam delivered by the prior proposal is about 45 times of the specific volume of the hot water delivered by the proposal of the utility model, the pipe diameter of the single pipe required by the steam delivered by the prior proposal is about 7 times of the pipe diameter of the single pipe required by the hot water delivered by the proposal of the utility model under the same mass flow.
Therefore, compared with the existing scheme, the scheme of the utility model can obviously reduce the pipe diameter of the pipeline of the conveying pipe network system, thereby obviously reducing the manufacturing cost of the pipe network system, the arrangement of the pipe system and the construction difficulty and strength of the pipe system.
In addition, the heating steam system based on hot water delivery takes low-pressure condensate water and the like as working medium sources, hot water meeting the pressure requirement of heating steam is obtained at a unit end after the processes of boosting, heating and the like, then the hot water is delivered to a user end, heating is continuously carried out in heating equipment at the user end, and finally the heating steam meeting the requirement is obtained. Wherein:
the superheated steam and unsaturated water at the same pressure have a much larger specific volume than the latter, and the flow area of the pipe required for the former is much larger than the latter at the same flow rate.
The independent booster pump A can adopt a variable frequency operation mode, so that the pressure of the heat supply working medium after boosting is kept stable when the operation load of the unit changes;
the scheme of the utility model is used for replacing the existing heat supply scheme with main steam as a steam source, and adopts the mode that the unit side provides hot water and then continues to heat to generate steam to the user side, thereby effectively overcoming the pressure loss and temperature drop of the heat supply steam transmitted to the user side through a pipeline system, reducing the investment and operation cost of high-pressure and high-temperature pipelines, avoiding the large-scale transformation of boilers and steam turbines, better adapting to the operation of the unit in a wide load range responding to the deep peak regulation of a power grid, and improving the heat supply operation safety and economy of the unit.
The present utility model provides several other preferred embodiments based on the embodiment 1, and the preferred embodiments are described in detail below.
Example 2
As shown in fig. 2, another heating steam system based on hot water delivery according to a preferred embodiment of the present utility model is based on embodiment 1, a booster pump B, a hybrid heater B and a regenerative extraction B thereof are added, one end of the booster pump B is connected to the hybrid heater a, the other end of the booster pump B is connected to the hybrid heater B, the other end of the hybrid heater B is connected to the booster pump, and the regenerative extraction B of the third regulating valve is used to perform regenerative heating on the heating medium. In the embodiment, through additionally arranging the booster pump B, the hybrid heater B and the regenerative extraction B thereof, the regenerative heating of the heat supply working medium is increased, and the heat supply economy is further improved.
Example 3
As shown in fig. 3, another heating steam system based on hot water delivery according to a preferred embodiment of the present utility model is provided, on the basis of embodiment 1, a regenerative steam extraction B, a regenerative heater B and a heat exchanger are added, the heat exchanger is connected to a booster pump and a delivery pipe network, and the superheating degree of the regenerative steam extraction B is used to further heat a heating medium, so as to further improve heating economy.
Example 4
As shown in fig. 4, another heating steam system based on hot water delivery according to a preferred embodiment of the present utility model optimizes the source of heating medium from low pressure condensate between the deaerator and the pre-pump to medium pressure feed water between the pre-pump and the feed water pump based on embodiment 1.
Compared with low-pressure condensate water, the medium-pressure water is boosted by the front-end pump with higher efficiency, and then boosted by the booster pump, so that part of pumping work can be saved, and the heating economy is improved.
Example 5
As shown in fig. 5, in another heating steam system based on hot water delivery according to a preferred embodiment of the present utility model, on the basis of embodiment 4, the front pump of this embodiment is independently powered, and the rated outlet pressure is higher than the heating steam extraction pressure requirement, so that the booster pump a can be omitted, and the fourth regulating valve is added, thereby simplifying the system, reducing investment, and improving heating economy.
Example 6
As shown in fig. 6, another heating steam system based on hot water delivery according to a preferred embodiment of the present utility model optimizes the low-pressure condensate water between the deaerator and the pre-pump as the high-pressure heater water-repellent (abbreviated as high-pressure water-repellent, hereinafter referred to as high-pressure water-repellent) on the basis of embodiment 1, wherein the high-pressure water-repellent may be normal water-repellent or critical water-repellent.
Compared with low-pressure condensate water, the high-pressure normal drain water has higher pressure, and the pressure is boosted by the booster pump, so that part of pumping work can be saved, and the heating economy is improved. Meanwhile, the high-pressure drainage is effectively utilized, so that the 'displacement' of steam extraction used by the lower-stage regenerative heater can be reduced, the steam extraction quantity of the lower-stage regenerative heater is increased, and the heat supply economy is further improved.
In addition, when the high-rise critical drainage is selected to replace normal drainage as a working medium source, the modification amount of a normal drainage system can be reduced.
Example 7
As shown in fig. 7, another heating steam system based on hot water delivery according to a preferred embodiment of the present utility model, on the basis of embodiment 1, a regenerative heating device for a heating medium is omitted, that is, a booster pump a, a hybrid heater a, a regenerative extraction a and a second regulating valve thereof are omitted, so that the heating system is greatly simplified, the system can be simplified, and investment is reduced.
The foregoing describes in detail preferred embodiments of the present utility model. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the utility model without requiring creative effort by one of ordinary skill in the art. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.
Claims (10)
1. A heat supply steam system based on hot water delivery is characterized by comprising a heat supply user side pipeline, a steam extraction and heat recovery pipeline and a heat supply working medium heating pipeline, wherein,
the heat supply user side pipeline is provided with a heater, a desuperheater and a first regulating valve, one end of the heater is connected with an outlet of a conveying pipe network, the other end of the heater is connected with a steam inlet of the desuperheater, a steam outlet of the desuperheater is connected with a heat supply user, one end of the first regulating valve is connected with an outlet of the conveying pipe network, and the other end of the first regulating valve is connected with a desuperheater water inlet;
the low-pressure condensate water at the outlet of the deaerator sequentially passes through the pre-pump and the water feeding pump to be pressurized and then enters the high-pressure heater to be heated, the heated water fed enters the boiler to be continuously heated, and finally main steam is obtained to enter the steam turbine to work;
the heat supply working medium heating pipeline is provided with a booster pump A, a hybrid heater A, a booster pump, a second regulating valve and a conveying pipe network, the heat supply working medium from the steam extraction and heat recovery pipeline is boosted by the booster pump A, fully mixed with the heat recovery steam extraction A in the hybrid heater A and heated, then boosted by the booster pump, conveyed to the heat supply user side pipeline in a hot water mode through the conveying pipe network, and the heat recovery steam extraction A is controlled by the second regulating valve.
2. The heating steam system of claim 1, wherein the heating medium is low pressure condensate between the deaerator and the pre-pump.
3. A heating steam system as claimed in claim 2, wherein the booster pump a is operated in variable frequency mode, and the number of the high-pressure heaters is at least one.
4. A heating steam system as claimed in claim 3, wherein the heater of the heating user side line is an electric heater or a gas heater.
5. The heating steam system as claimed in claim 4, wherein the heating medium heating pipeline is further provided with a booster pump B, a hybrid heater B and a third regulating valve, one end of the booster pump B is connected with the hybrid heater a, the other end of the booster pump B is connected with the hybrid heater B, the other end of the hybrid heater B is connected with the booster pump, and the heating medium is subjected to regenerative heating through regenerative steam extraction B of the third regulating valve.
6. The heating steam system as claimed in claim 4, wherein the heating medium heating pipeline is further provided with a regenerative steam extraction B, a regenerative heater B and a heat exchanger, the heat exchanger is connected with the booster pump and the conveying pipe network, and the heating medium is further heated by using the superheat degree of the regenerative steam extraction B.
7. A heating steam system as claimed in claim 4 wherein the source of heating medium is replaced by the low pressure condensate between the deaerator and the pre-pump with medium pressure feedwater between the pre-pump and the feedwater pump.
8. The heating steam system as set forth in claim 7, wherein the pre-pump is independently electrically operated, the rated outlet pressure of the pre-pump is higher than the heating steam extraction pressure, and the booster pump a is replaced with a fourth regulating valve.
9. A heating steam system as claimed in claim 4, wherein the source of heating medium is replaced by high pressure heater drain by the low pressure condensate between the deaerator and the pre-pump, the high pressure heater drain being either normally drain or critical drain.
10. The heating steam system of claim 4, wherein the heating medium heating line removes a regenerative heating device for the heating medium, the regenerative heating device comprising the booster pump a, the hybrid heater a, the second regulating valve, and the regenerative extraction gas a.
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