CN115680806B - High-fall cyclic power generation system and method for preventing condensation and backflow of exhaust gas by utilizing steam heat preservation layer - Google Patents
High-fall cyclic power generation system and method for preventing condensation and backflow of exhaust gas by utilizing steam heat preservation layer Download PDFInfo
- Publication number
- CN115680806B CN115680806B CN202211377002.3A CN202211377002A CN115680806B CN 115680806 B CN115680806 B CN 115680806B CN 202211377002 A CN202211377002 A CN 202211377002A CN 115680806 B CN115680806 B CN 115680806B
- Authority
- CN
- China
- Prior art keywords
- steam
- condensate
- heat preservation
- heat
- layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000004321 preservation Methods 0.000 title claims abstract description 111
- 238000009833 condensation Methods 0.000 title claims abstract description 36
- 230000005494 condensation Effects 0.000 title claims abstract description 36
- 238000010248 power generation Methods 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 16
- 125000004122 cyclic group Chemical group 0.000 title claims description 5
- 239000007788 liquid Substances 0.000 claims abstract description 60
- 238000011084 recovery Methods 0.000 claims abstract description 41
- 230000001502 supplementing effect Effects 0.000 claims abstract description 13
- 230000001105 regulatory effect Effects 0.000 claims description 61
- 238000010992 reflux Methods 0.000 claims description 19
- 238000009413 insulation Methods 0.000 claims description 11
- 230000001276 controlling effect Effects 0.000 claims description 10
- 239000011490 mineral wool Substances 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 6
- 229920002635 polyurethane Polymers 0.000 claims description 6
- 239000004814 polyurethane Substances 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 4
- 239000011810 insulating material Substances 0.000 claims description 3
- 230000007246 mechanism Effects 0.000 claims description 2
- 230000005611 electricity Effects 0.000 claims 1
- 239000013589 supplement Substances 0.000 claims 1
- 229910000831 Steel Inorganic materials 0.000 abstract description 8
- 239000010959 steel Substances 0.000 abstract description 8
- 230000001174 ascending effect Effects 0.000 abstract description 6
- 230000000903 blocking effect Effects 0.000 abstract description 6
- 230000002265 prevention Effects 0.000 abstract description 3
- 238000005299 abrasion Methods 0.000 abstract description 2
- 230000002401 inhibitory effect Effects 0.000 abstract 1
- 238000004064 recycling Methods 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 70
- 239000007789 gas Substances 0.000 description 28
- 230000000694 effects Effects 0.000 description 7
- 230000006378 damage Effects 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000002427 irreversible effect Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000008844 regulatory mechanism Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- -1 steam condensate Substances 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
Landscapes
- Engine Equipment That Uses Special Cycles (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
The invention provides a high-fall circulation power generation system and a method for preventing exhaust gas from condensing and reflowing by utilizing a steam heat-insulating layer, and belongs to the technical field of condensation and reflow prevention. Solves the problem that the long-distance exhaust gas conveying ascending pipeline can not directly adopt the conventional steel sleeve steel direct-buried heat preservation pipe mode to carry out steam conveying. The system comprises a steam heat-insulating pipe, a condensate collecting box, a pump, a condenser, a dead steam conveying pipeline, a heat-insulating layer steam conveying main pipeline, an evaporator, an expander and an automatic condensate recovery device, wherein a small amount of high-temperature steam is introduced into the middle layer of the three-layer nested heat-insulating pipe to serve as heat-insulating layer steam, the heat-insulating layer steam is utilized to insulate the dead steam at the outlet of the expander, and liquid filling and liquid supplementing are realized through the automatic condensate recovery device. The invention establishes a three-effect integrated condensation backflow prevention structure of blocking, inhibiting and recycling, and effectively inhibits the exhaust steam condensation backflow of a high-drop thermal cycle power generation system in an ascending pipeline of an outlet of an expander and causes hydraulic impact abrasion of the expander.
Description
Technical Field
The invention belongs to the technical field of condensation backflow prevention, and particularly relates to a high-fall circulation power generation system and method for preventing exhaust gas from condensation backflow by utilizing a steam heat preservation layer.
Background
The existing thermodynamic system and steam conveying pipelines in a heat supply pipe network mostly use steam direct-buried heat preservation pipes, the heat preservation pipes are buried underground, a steel sleeve steel direct-buried heat preservation pipe mode is mainly adopted, and heat preservation materials on the steam pipelines are mainly rock wool and polyurethane. Polyurethane has good heat preservation effect but high manufacturing cost, and rock wool has poor heat preservation effect but noise reduction performance, so that the common practice is to wrap polyurethane by the rock wool as an inner protection layer.
For thermodynamic cycle power generation systems such as an organic Rankine cycle power generation system, a working medium pipeline cannot adopt a steel sleeve and steel direct-buried heat preservation pipe mode, a steam pipeline is required to be exposed outdoors, and if only a traditional heat preservation material is adopted, rock wool is easy to enter water in rainy days at this moment, a heat preservation layer can be separated after long-time accumulation, and serious harm is caused to the thermodynamic system due to failure of the heat preservation pipe. Particularly, for a high-drop thermodynamic cycle power generation system in extremely cold areas, a condenser is usually arranged at a high position, exhaust steam at an outlet of an expansion machine needs to flow through a long-distance ascending pipeline and then enter the condenser to be condensed, and during the period, if the exhaust steam is condensed in advance in the ascending pipeline, liquid drops are easily formed and fall back to the expansion machine, the phenomenon of liquid impact of the expansion machine is easily caused, and the service life of the expansion machine is seriously influenced.
To above problem, present has provided a prefabricated overhead heat preservation pipe, prefabricated overhead heat preservation pipe includes the work pipe, work pipe outside parcel inorganic heat preservation, organic heat preservation and outer pillar in proper order is available subaerial steam delivery pipeline. However, as the protective layers of the heat-insulating pipe are connected in a crimping manner, the two ends of the pipe orifice of the heat-insulating pipe are not tightly connected with the two ends of the heat-insulating layer, and the heat-insulating effect is seriously affected when the two sides of the heat-insulating layer are exposed in the air; meanwhile, as the heat preservation layer is single in structure, once the heat preservation layer is damaged, the heat preservation effect of the pipeline can be affected, and therefore effective transportation of hot steam in the pipe is affected.
Therefore, a new high-drop thermodynamic cycle power generation system is needed to solve the above problems.
Disclosure of Invention
Therefore, the invention aims to provide a high-fall circulation power generation system for preventing condensation and backflow of exhaust gas by utilizing a steam heat preservation layer, so as to solve the problem that a long-distance exhaust gas conveying ascending pipeline cannot directly adopt a conventional steel sleeve steel direct-buried heat preservation pipe mode for steam conveying.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
A high-fall circulation power generation system for preventing exhaust gas from condensing and reflowing by utilizing a steam heat preservation layer comprises a steam heat preservation pipe, a condensate collecting box, a pump, a condenser, a dead steam conveying pipeline, a heat preservation layer steam conveying main pipeline, an evaporator, an expander, a flow regulating valve I, a flow regulating valve II, a flow regulating valve III and an automatic condensate recovery device;
The gas outlet of the evaporator is respectively communicated with the inlet end of the flow regulating valve I and the inlet end of the flow regulating valve III, the outlet end of the flow regulating valve I is communicated with the inlet end of the expansion machine, the exhaust end of the expansion machine is connected with the inlet end of the flow regulating valve II, the outlet end of the flow regulating valve II is connected with the exhaust steam inlet end of the steam heat preservation pipe through an exhaust steam conveying pipeline, the outlet end of the flow regulating valve III is connected with a plurality of heat preservation steam inlet ends on the steam heat preservation pipe through a heat preservation steam conveying main pipeline, the gas at the outlet end of the heat preservation steam pipe comprises exhaust steam and heat preservation steam, the outlet end of the heat preservation steam pipe is connected with the inlet end of the condenser, the outlet end of the condenser is connected with the inlet end of the pump, the outlet end of the pump is connected with the evaporator, the condensate discharge end of the steam heat preservation pipe is connected with the inlet end of the condensate collecting box, the outlet end of the condensate collecting box is connected with the inlet end of the condensate automatic recovery device, the liquid outlet end of the condensate automatic recovery device is communicated with the inlet end of the pump, the condensate automatic recovery device is used for the condensate liquid recovery device, and the condensate recovery device is used for the condensate liquid recovery device; the expander is coaxially arranged with the generator;
Most of the superheated steam generated in the evaporator enters the expansion machine to do work through the flow regulating valve I, and a small amount of superheated steam generated in the evaporator enters the heat preservation steam inlet end of the steam heat preservation pipe through the flow regulating valve III and the heat preservation steam conveying main pipeline.
Still further, automatic recovery unit of condensate includes control valve I, control valve II, condensate delivery jar, high level switch, control box and condensate delivery line, the exit end of condensate collection box is connected with control valve I entrance point, control valve I exit end is connected with condensate delivery jar feed liquor end, condensate delivery jar high level signal output part passes through high level switch and carries the instruction to the signal input part of control box, the signal output part of control box is connected with the signal input part of control valve I, the signal output part of control box is connected with the signal input part of control valve II, the flowing back end of condensate delivery jar is connected with the entrance point of control valve II, the exit end of control valve II is connected with the entrance point of pump through condensate delivery line.
Furthermore, the steam heat-insulating pipe is a three-layer nested heat-insulating pipe, wherein exhaust steam required for heat-insulating transportation is introduced into the steam heat-insulating pipe, the innermost layer is a vacuum layer, a small amount of superheated steam generated at the outlet end of the evaporator is introduced into the second layer as a steam layer, and the outermost layer is a heat-insulating material layer.
Furthermore, a small amount of superheated steam respectively enters the four heat-insulating layer steam inlet ends through four branches after passing through the heat-insulating layer steam conveying main pipeline, and a flow regulating valve IV, a flow regulating valve V, a flow regulating valve VI and a flow regulating valve VII are respectively arranged on the four branches.
Furthermore, the flow regulating valve I and the flow regulating valve II are used for controlling the superheated steam flow entering the expansion machine and the superheated steam flow entering the heat-preserving steam pipe, the flow regulating valve III is used for controlling the superheated steam flow entering the steam layer of the heat-preserving steam pipe, and condensation of the dead steam is inhibited to the greatest extent by reasonably controlling the superheated steam flow of the dead steam and the superheated steam flow of the steam layer in the steam heat-preserving pipe.
Furthermore, the control valve I and the control valve II are steam drain valves, and the control valve I and the control valve II are used for automatically discharging steam condensate and air in a steam pipeline.
Furthermore, the steam inlet ends of the four heat preservation layers are uniformly distributed on the steam heat preservation pipe from top to bottom.
Further, the heat preservation material layer is rock wool and polyurethane.
Another object of the present application is to provide a method for operating a high head circulation power generation system for preventing condensation and reflux of exhaust gas by using a steam insulation layer, comprising
The condensate in the condenser is input into the evaporator through the pump, most of the superheated steam generated by the evaporator works in the expander to drive the generator to generate power, the dead steam generated after the work is introduced into the dead steam inlet end of the heat preservation steam pipe, a small amount of the superheated steam generated by the evaporator is introduced into the steam inlet ends of a plurality of heat preservation layers of the heat preservation steam pipe to directly serve as heat preservation steam, the heat preservation steam layers and the vacuum layers act together to inhibit the dead steam transported in the pipe from generating condensation reflux, the dead steam and the heat preservation steam flow into the condenser through the outlet end of the heat preservation steam pipe, the condensate enters the condensate collecting box through the condensate discharging end of the steam heat preservation pipe, the condensate collecting box is filled with liquid through the condensate conveying tank of the condensate automatic recovery device, and meanwhile, the condensate automatic recovery device is used for supplementing liquid for the evaporator by utilizing the principle of automatic control, so that thermodynamic cycle power generation is formed.
Further, the regulation mechanism for the condensate automatic recovery device comprises
When the recovery system is in a liquid filling state, the control valve I is in an open state, the control valve II is in a closed state, and condensate in the condensate collecting box flows into the condensate conveying tank through the control valve I, so that the liquid level in the condensate conveying tank is low;
When the recovery system is in a liquid supplementing state, after the liquid level in the condensate conveying tank reaches a certain height, the high liquid level switch responds and sends a signal instruction to the signal receiving end of the control box, then the output end of the control box sends an instruction to the control valve I and the control valve II, at the moment, the control valve I is in a closed state, the control valve II is in an open state, condensate generated by the steam heat-insulating pipe is firstly stored in the condensate collecting box, and the liquid in the condensate conveying tank is returned to the inlet of the pump through the condensate conveying pipeline under the action of pressure difference due to the fact that the liquid pressure in the condensate conveying tank is higher than the pressure of the inlet end of the pump, so that the liquid supplementing process is realized.
Compared with the prior art, the high-fall circulation power generation system for preventing the condensation and backflow of the exhaust gas by utilizing the steam heat preservation layer has the beneficial effects that:
(1) The high-fall circulation power generation system for preventing condensation and reflux of exhaust gas by utilizing the steam heat preservation layer, disclosed by the invention, uses the steam with higher temperature as the heat preservation steam layer to preserve heat for exhaust steam in the heat preservation pipe, can effectively solve the problem that long-distance exhaust gas conveying rising pipelines in a waste heat driven thermal circulation power generation system cannot adopt common buried underground steam heat preservation pipes to carry out steam conveying, is particularly suitable for the condition of exhaust steam heat preservation directly connected with an expander, and can effectively inhibit irreversible damage such as corrosion and the like caused by condensation and reflux of the exhaust steam to the expander.
(2) The invention provides a high-fall circulation power generation system for preventing exhaust gas from condensing and reflowing by utilizing a steam heat-insulating layer. The steam layer plays a role in blocking heat exchange between the exhaust gas in the pipe and the external environment; the heat conductivity coefficient of the vacuum layer is low, so that the heat exchange between the steam layer and the outside can be effectively inhibited, and the heat insulation blocking effect between the exhaust gas and the environment is further improved; meanwhile, the problems that the traditional heat insulation material is poor in heat insulation effect, water inflow, falling off and failure are easy to occur due to long-term exposure can be effectively solved.
(3) The high-fall circulation power generation system for preventing the condensation and reflux of the exhaust gas by utilizing the steam heat preservation layer is provided with the condensate automatic recovery part, the condensate in the pipeline is discharged and recovered in time by matching with the instruction of the control box, and the working medium of the recovery part can continue to participate in the system circulation under the action of the pump, so that the condensation and reflux preventing structure and the thermodynamic circulation are combined for circulation reconstruction. The condensate is recycled while avoiding damages such as corrosion, large vibration and the like caused by the condensate flowing back to the expander, so that the working medium utilization rate of the organic Rankine cycle system is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute an undue limitation on the invention. In the drawings:
FIG. 1 is a schematic diagram of a high head circulation power generation system for preventing condensation and backflow of exhaust gas by using a steam insulation layer according to an embodiment of the present invention;
Fig. 2 is a schematic structural diagram of a steam insulation pipe in a high-head circulation power generation system for preventing condensation and backflow of exhaust gas by using a steam insulation layer according to an embodiment of the invention.
Reference numerals illustrate:
1. A steam heat-insulating pipe; 2. a condensate collection tank; 3. a control valve I; 4. a control valve II; 5. a condensate transfer tank; 6. a high liquid level switch; 7. a control box; 8. a condensate delivery line; 9. a pump; 10. a condenser; 11. a dead steam conveying pipeline; 12. a heat-insulating layer steam conveying main pipeline; 13. an evaporator; 14. an expander; 15. a flow regulating valve I; 16. a flow regulating valve II; 17. a flow regulating valve III; 18. a flow regulating valve IV; 19. a flow regulating valve V; 20. a flow regulating valve VI; 21. a flow regulating valve VII.
Detailed Description
The present invention now will be described more fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention disclosed herein without departing from the scope of the invention.
In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are based on those shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the creation of the present invention will be understood in a specific case by those skilled in the art.
In addition, the technical features which are described below and which are involved in the various embodiments of the invention can be combined with one another as long as they do not conflict with one another.
1-2, A high-fall circulation power generation system for preventing condensation and backflow of exhaust gas by utilizing a steam heat preservation layer comprises a steam heat preservation pipe 1, a condensate collecting box 2, a pump 9, a condenser 10, a dead steam conveying pipeline 11, a heat preservation layer steam conveying main pipeline 12, an evaporator 13, an expander 14, a flow regulating valve I15, a flow regulating valve II 16, a flow regulating valve III 17 and an automatic condensate recovery device;
The air outlet of the evaporator 13 is respectively communicated with the inlet end of the flow regulating valve I15 and the inlet end of the flow regulating valve III 17, the outlet end of the flow regulating valve I15 is communicated with the air inlet end of the expansion machine 14, the air outlet end of the expansion machine 14 is connected with the inlet end of the flow regulating valve II 16, the outlet end of the flow regulating valve II 16 is connected with the exhaust steam inlet end of the steam heat preservation pipe 1 through the exhaust steam conveying pipeline 11, the outlet end of the flow regulating valve III 17 is connected with the steam inlet ends of a plurality of heat preservation layers on the steam heat preservation pipe 1 through the heat preservation steam conveying main pipeline 12, the gas at the outlet end of the heat preservation steam pipe 1 comprises exhaust steam and heat preservation steam, the outlet end of the heat preservation steam pipe 1 is connected with the inlet end of the condenser 10, the outlet end of the condenser 10 is connected with the inlet end of the pump 9, the outlet end of the pump 9 is connected with the evaporator 13, the condensate discharging end of the steam heat preservation pipe 1 is connected with the inlet end of the condensate collecting box 2, the outlet end of the condensate collecting box 2 is connected with the liquid inlet end of the condensate automatic recovery device, the liquid outlet end of the condensate automatic recovery device is communicated with the inlet end of the pump 9, the condensate collecting box 2 is used for filling liquid for the condensate automatic recovery device, and the condensate automatic recovery device is used for supplementing liquid for the evaporator 3; the expander 14 is arranged coaxially with a generator (not shown);
Most of the superheated steam generated in the evaporator 13 enters the expander 14 to do work through the flow regulating valve I15, and a small amount of the superheated steam generated in the evaporator 13 enters the heat-insulating layer steam inlet end of the steam heat-insulating pipe 1 through the flow regulating valve III 17 and the heat-insulating layer steam conveying main pipeline 12.
The automatic condensate recovery device comprises a control valve I3, a control valve II 4, a condensate conveying tank 5, a high liquid level switch 6, a control box 7 and a condensate conveying pipeline 8, wherein the outlet end of the condensate collecting tank 2 is connected with the inlet end of the control valve I3, the outlet end of the control valve I3 is connected with the liquid inlet end of the condensate conveying tank 5, the high liquid level signal output end of the condensate conveying tank 5 conveys instructions to the signal input end of the control box 7 through the high liquid level switch 6, the signal output end of the control box 7 is connected with the signal input end of the control valve I3, the signal output end of the control box 7 is connected with the signal input end of the control valve II 4, the liquid discharge end of the condensate conveying tank 5 is connected with the inlet end of the control valve II 4, and the outlet end of the control valve II 4 is connected with the inlet end of the pump 9 through the condensate conveying pipeline 8. According to the liquid level height signal in the condensate conveying tank, the control end is matched with the output instruction of the control end to control the opening and closing of the valve I3 and the valve II 4, and the liquid filling and supplementing processes of the condensate recovery system are realized.
The steam heat-insulating pipe 1 is a three-layer nested heat-insulating pipe, exhaust steam required for heat-insulating transportation is introduced into the steam heat-insulating pipe, the innermost layer is a vacuum layer, the heat conductivity coefficient of the vacuum layer is low, and heat exchange between exhaust gas and the outside can be effectively weakened; the second layer is filled with a small amount of superheated steam generated at the outlet end of the evaporator 13 as a steam layer, so that the effect of blocking heat exchange between the exhaust gas in the pipe and the external environment is achieved, and the heat insulation blocking effect between the exhaust gas and the environment is further improved; the outermost layer is the heat preservation material layer, the heat preservation material layer is rock wool and polyurethane, reduces the heat loss in the system.
A small amount of superheated steam enters four heat-insulating layer steam inlet ends through four branches after passing through the heat-insulating layer steam conveying main pipeline 12, and flow regulating valves IV 18, V19, VI 20 and VII 21 are respectively arranged on the four branches; the steam inlet ends of the four heat preservation layers are uniformly distributed on the steam heat preservation pipe 1 from top to bottom; the superheated (high-temperature) steam is divided into four branches after passing through the heat preservation steam conveying main pipeline 12 and is respectively introduced into evenly distributed air inlet points on the heat preservation steam pipe (1), and the flow of the heat preservation steam flowing in the four branches is respectively controlled through the flow regulating valve IV 18, the flow regulating valve V19, the flow regulating valve VI 20 and the flow regulating valve VII 21, so that the temperature of the outer wall of the heat preservation pipe is prevented from being uneven, and the heat insulation effect of the pipeline is improved.
The flow regulating valve I15 and the flow regulating valve II 16 are used for controlling the flow of the superheated steam entering the expansion machine 14 and the flow of the superheated steam entering the heat-preserving steam pipe 1, the flow regulating valve III 17 is used for controlling the flow of the superheated steam entering the steam layer of the heat-preserving steam pipe 1, and condensation of the superheated steam is inhibited to the greatest extent by reasonably controlling the flow of the superheated steam in the steam heat-preserving pipe 1 and the superheated steam of the steam layer.
The control valve I3 and the control valve II 4 are steam drain valves, and the control valve I3 and the control valve II 4 are used for automatically removing steam condensate and air in a steam pipeline; the control valve I3 and the control valve II 4 are also simply called drain valves, and have the functions of automatically removing non-condensable gases such as steam condensate, air and the like in a steam pipeline, preventing steam from leaking out, and blocking steam and draining water.
According to the high-fall circulation power generation system for preventing condensation and reflux of exhaust gas by utilizing the steam heat preservation layer, a small amount of high-temperature steam from the evaporator is used as the heat preservation steam layer, so that the exhaust steam in the heat preservation pipe can be effectively preserved, and irreversible damage of condensation and reflux to the expansion machine, such as liquid impact, can be prevented.
A working method of a high-fall circulation power generation system for preventing condensation and reflux of exhaust gas by utilizing a steam heat preservation layer comprises the following steps
The condensate in the condenser 10 is input into the evaporator 13 through the pump 9, most of the superheated steam generated by the evaporator 13 works in the expander 14 to drive the generator to generate power, the dead steam generated after the working is introduced into the dead steam inlet end of the heat preservation steam pipe 1, a small amount of the superheated steam generated by the evaporator 13 is introduced into the steam inlet ends of a plurality of heat preservation layers of the heat preservation steam pipe 1 to directly serve as the heat preservation steam, the heat preservation steam layers and the vacuum layers act together to realize the nearly adiabatic separation between the dead steam inside and the external environment, the dead steam transported in the pipe is effectively inhibited from generating condensation reflux, the dead steam and the heat preservation steam flow into the condenser 10 through the outlet end of the heat preservation steam pipe 1, the condensate enters the condensate collecting box 2 through the condensate discharging end of the steam heat preservation pipe 1, the condensate collecting box 2 is filled with liquid through the condensate conveying tank 5 of the condensate automatic recovery device, and meanwhile, the process of the condensate automatic recovery device is used for evaporator liquid supplementing by utilizing the principle of automatic control, so that the thermal cycle power generation is formed.
A working method of a high-fall cyclic power generation system for preventing condensation and reflux of exhaust gas by utilizing a steam heat preservation layer, which aims at a regulating and controlling mechanism of an automatic condensate recovery device, comprises
When the recovery system is in a liquid filling state, the control valve I3 is in an open state, the control valve II 4 is in a closed state, and condensate in the condensate collecting tank 2 flows into the condensate conveying tank 5 through the control valve I3, and at the moment, the liquid level in the condensate conveying tank 5 is lower;
When the recovery system is in a liquid supplementing state, after the liquid level in the condensate conveying tank 5 reaches a certain height, the high liquid level switch 6 responds to and sends a signal instruction to a signal receiving end of the control box 7, then an output end of the control box 7 sends an instruction to the control valve I3 and the control valve II 4, at the moment, the control valve I3 is in a closed state, the control valve II 4 is in an open state, condensate generated by the steam heat insulation pipe 1 is firstly stored in the condensate collecting tank 2, and the liquid in the condensate conveying tank 5 is returned to an inlet of the pump 9 through the condensate conveying pipeline 8 under the action of pressure difference due to the fact that the liquid pressure in the condensate conveying tank 5 is higher than the pressure of an inlet end of the pump 9, so that a liquid supplementing process is realized.
The system of the application introduces a small amount of superheated (high-temperature) steam into the middle layer of the three-layer nested heat preservation pipe as heat preservation steam, uses the heat preservation steam as exhaust steam at the outlet of the expansion machine for heat preservation, and is provided with the condensate automatic recovery system, and controls the opening and closing of the control valve I3 and the control valve II 4 according to the liquid level height signal in the condensate conveying tank and the output instruction of the control end, thereby realizing the liquid filling and supplementing processes of the condensate recovery system. The system is characterized in that the vacuum layer, the steam heat-insulating layer and the heat-insulating material layer are additionally arranged on the outer wall of the exhaust gas pipeline, so that nearly adiabatic separation is realized between exhaust gas and the environment, and the condensation-preventing backflow structure is combined with thermodynamic cycle to carry out cyclic reconstruction, so that the separation-inhibition-recovery three-effect integrated condensation-preventing backflow structure is established, and the problems that the high-head thermodynamic cycle power generation system generates exhaust steam condensation backflow in an ascending pipeline of an outlet of an expander, causes hydraulic impact abrasion of the expander and the like can be effectively inhibited.
The inventive embodiments disclosed above are merely intended to help illustrate the inventive embodiments. The examples are not intended to be exhaustive or to limit the invention to the precise form disclosed. Many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best understand and utilize the invention.
Claims (8)
1. A high-fall cyclic power generation system for preventing condensation and reflux of exhaust gas by utilizing a steam heat preservation layer is characterized in that: the condensate automatic recovery device comprises a steam heat preservation pipe (1), a condensate collecting box (2), a pump (9), a condenser (10), a dead steam conveying pipeline (11), a heat preservation steam conveying main pipeline (12), an evaporator (13), an expander (14), a flow regulating valve I (15), a flow regulating valve II (16), a flow regulating valve III (17) and a condensate automatic recovery device;
The air outlet of the evaporator (13) is respectively communicated with the inlet end of the flow regulating valve I (15) and the inlet end of the flow regulating valve III (17), the outlet end of the flow regulating valve I (15) is communicated with the air inlet end of the expansion machine (14), the air outlet end of the expansion machine (14) is connected with the inlet end of the flow regulating valve II (16), the outlet end of the flow regulating valve II (16) is connected with the exhaust steam inlet end of the steam heat preserving pipe (1) through an exhaust steam conveying pipeline (11), the outlet end of the flow regulating valve III (17) is connected with a plurality of heat preserving layer steam inlet ends on the steam heat preserving pipe (1) through a heat preserving layer steam conveying main pipeline (12), the air at the outlet end of the steam heat preserving pipe (1) contains exhaust steam and heat preserving layer steam, the outlet end of the steam heat preserving pipe (1) is connected with the inlet end of the condenser (10), the outlet end of the condenser (10) is connected with the inlet end of the pump (9), the outlet end of the pump (9) is connected with the evaporator (13) and the condensate liquid condensate (2) is automatically recovered by the condensate liquid collecting device, and the condensate (2) is automatically recovered by the condensate liquid collecting device, the condensate automatic recovery device is used for supplementing liquid for the evaporator (3); the expander (14) is coaxially arranged with the generator;
Most of the superheated steam generated in the evaporator (13) enters the expansion machine (14) to do work through the flow regulating valve I (15), and a small amount of the superheated steam generated in the evaporator (13) enters the heat-insulating layer steam inlet end of the steam heat-insulating pipe (1) through the flow regulating valve III (17) and the heat-insulating layer steam conveying main pipeline (12);
The automatic condensate recovery device comprises a control valve I (3), a control valve II (4), a condensate conveying tank (5), a high liquid level switch (6), a control box (7) and a condensate conveying pipeline (8), wherein the outlet end of the condensate collecting box (2) is connected with the inlet end of the control valve I (3), the outlet end of the control valve I (3) is connected with the liquid inlet end of the condensate conveying tank (5), the high liquid level signal output end of the condensate conveying tank (5) conveys instructions to the signal input end of the control box (7) through the high liquid level switch (6), the signal output end of the control box (7) is connected with the signal input end of the control valve I (3), the signal output end of the control box (7) is connected with the signal input end of the control valve II (4), the liquid discharge end of the condensate conveying tank (5) is connected with the inlet end of the control valve II (4), and the outlet end of the control valve II (4) is connected with the inlet end of the pump (9) through the condensate conveying pipeline (8);
The steam heat-insulating pipe (1) is a three-layer nested heat-insulating pipe, wherein exhaust steam required for heat-insulating transportation is introduced into the steam heat-insulating pipe, the innermost layer is a vacuum layer, a small amount of superheated steam generated at the outlet end of the evaporator (13) is introduced into the second layer to serve as a steam layer, and the outermost layer is a heat-insulating material layer.
2. The high head circulation power generation system for preventing condensation and reflux of exhaust gas by utilizing a steam heat preservation layer according to claim 1, wherein the system comprises the following components: a small amount of superheated steam enters four heat-insulating layer steam inlet ends through four branches after passing through a heat-insulating layer steam conveying main pipeline (12), and flow regulating valves IV (18), V (19), VI (20) and VII (21) are respectively arranged on the four branches.
3. The high head circulation power generation system for preventing condensation and reflux of exhaust gas by utilizing a steam heat preservation layer according to claim 1, wherein the system comprises the following components: the flow regulating valve I (15) and the flow regulating valve II (16) are used for controlling the superheated steam flow entering the expansion machine (14) and the superheated steam flow entering the steam heat-preserving pipe (1), the flow regulating valve III (17) is used for controlling the superheated steam flow entering the steam layer of the steam heat-preserving pipe (1), and condensation of the dead steam is inhibited to the greatest extent by reasonably controlling the superheated steam flow of the dead steam in the steam heat-preserving pipe (1) and the superheated steam flow of the steam layer.
4. The high head circulation power generation system for preventing condensation and reflux of exhaust gas by utilizing a steam heat preservation layer according to claim 1, wherein the system comprises the following components: the control valve I (3) and the control valve II (4) are steam drain valves, and the control valve I (3) and the control valve II (4) are used for automatically removing steam condensate and air in a steam pipeline.
5. The high head circulation power generation system for preventing condensation and reflux of exhaust gas by utilizing a steam heat preservation layer according to claim 1, wherein the system comprises the following components: the steam inlet ends of the four heat preservation layers are uniformly distributed on the steam heat preservation pipe (1) from top to bottom.
6. The high head circulation power generation system for preventing condensation and reflux of exhaust gas by utilizing a steam heat preservation layer according to claim 1, wherein the system comprises the following components: the heat preservation material layer is rock wool and polyurethane.
7. A method of operating a high head circulation power generation system utilizing a vapor insulation to prevent condensation and reflux of exhaust gas according to any one of claims 1-6, characterized by: comprising
The condensate in the condenser (10) is input into the evaporator (13) through the pump (9), most of superheated steam generated by the evaporator (13) works in the expander (14) to drive the generator to generate electricity, the dead steam generated after the work is introduced into the dead steam inlet end of the steam heat preservation pipe (1), a small amount of superheated steam generated by the evaporator (13) is introduced into the steam inlet ends of a plurality of heat preservation layers of the steam heat preservation pipe (1) to directly serve as heat preservation steam, the heat preservation steam layers and the vacuum layers act together to inhibit the dead steam transported in the pipe from generating condensation reflux, the dead steam and the heat preservation steam flow into the condenser (10) through the outlet end of the steam heat preservation pipe (1), the condensate enters the condensate collecting box (2) through the condensate discharging end of the steam heat preservation pipe (1), the condensate collecting box (2) is filled with liquid through the condensate conveying tank (5) of the condensate condensing recovery device, and meanwhile, the condensate automatic recovery device is realized to supplement the evaporator by utilizing the principle of automatic control, so that the thermal cycle is formed.
8. The method for operating a high head circulation power generation system utilizing a vapor insulation layer to prevent condensation and backflow of exhaust gas according to claim 7, wherein the method comprises the steps of: the regulating mechanism for the condensate automatic recovery device comprises
When the recovery system is in a liquid filling state, the control valve I (3) is in an open state, the control valve II (4) is in a closed state, and condensate in the condensate collecting tank (2) flows into the condensate conveying tank (5) through the control valve I (3), so that the liquid level in the condensate conveying tank (5) is lower;
When the recovery system is in a liquid supplementing state, after the liquid level in the condensate conveying tank (5) reaches a certain height, the high liquid level switch (6) responds to and sends a signal instruction to the signal receiving end of the control box (7), then the output end of the control box (7) sends an instruction to the control valve I (3) and the control valve II (4), at the moment, the control valve I (3) is in a closed state, the control valve II (4) is in an open state, condensate generated by the steam heat preservation pipe (1) is firstly stored in the condensate collecting tank (2), and the liquid in the condensate conveying tank (5) is returned to the inlet of the pump (9) through the condensate conveying pipeline (8) under the action of pressure difference due to the fact that the liquid pressure in the condensate conveying tank (5) is higher than the pressure of the inlet end of the pump (9), so that a liquid supplementing process is realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211377002.3A CN115680806B (en) | 2022-11-04 | 2022-11-04 | High-fall cyclic power generation system and method for preventing condensation and backflow of exhaust gas by utilizing steam heat preservation layer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211377002.3A CN115680806B (en) | 2022-11-04 | 2022-11-04 | High-fall cyclic power generation system and method for preventing condensation and backflow of exhaust gas by utilizing steam heat preservation layer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115680806A CN115680806A (en) | 2023-02-03 |
| CN115680806B true CN115680806B (en) | 2024-09-24 |
Family
ID=85050979
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211377002.3A Active CN115680806B (en) | 2022-11-04 | 2022-11-04 | High-fall cyclic power generation system and method for preventing condensation and backflow of exhaust gas by utilizing steam heat preservation layer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115680806B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104832232A (en) * | 2015-05-13 | 2015-08-12 | 辽宁工程技术大学 | Gradient heat exchange organic Rankine cycle power generation system and power generation method thereof |
| CN109538318A (en) * | 2019-01-21 | 2019-03-29 | 翁志远 | A kind of cryogenic fluid electricity generation system and dynamical system |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1547138A (en) * | 1967-01-30 | 1968-11-22 | Carrier Corp | Protection device for absorption refrigeration machine |
| KR101135685B1 (en) * | 2009-12-31 | 2012-04-13 | 한국에너지기술연구원 | Control method of Organic Rankine Cycle System Pump |
| CN111794819A (en) * | 2019-04-08 | 2020-10-20 | 北京宏远佰思德科技有限公司 | Low-temperature working medium supercritical power generation system or power system and equipment |
| CN109899122B (en) * | 2019-04-10 | 2022-04-15 | 广西玉柴机器股份有限公司 | Control method of exhaust gas waste heat recovery system of marine engine |
| CN110748873B (en) * | 2019-10-08 | 2021-04-16 | 河南理工大学 | Exhaust steam heat regeneration system of power plant |
-
2022
- 2022-11-04 CN CN202211377002.3A patent/CN115680806B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104832232A (en) * | 2015-05-13 | 2015-08-12 | 辽宁工程技术大学 | Gradient heat exchange organic Rankine cycle power generation system and power generation method thereof |
| CN109538318A (en) * | 2019-01-21 | 2019-03-29 | 翁志远 | A kind of cryogenic fluid electricity generation system and dynamical system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115680806A (en) | 2023-02-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8820078B1 (en) | Heat recovery steam generator and method for fast starting combined cycles | |
| RU2124672C1 (en) | Waste-heat boiler and method of its operation | |
| CA3041273C (en) | Subatmospheric heating and cooling system | |
| CN104048161A (en) | United gasification device of liquified natural gas (LNG) | |
| CN109945277A (en) | A kind of energy conserving system being used for central heating using electric heat pump depth recycling remaining heat of flue gas from steam power plant | |
| CN101776401B (en) | Air-cooled steam condensing system with natural ventilation and direct water film evaporation | |
| CN103115388B (en) | Thermal power plant circulating water heat supply system | |
| CN102094744A (en) | Condensate water and cooling water regenerating device of thermal power plant and nuclear power plant | |
| CN101776400A (en) | Forced-draft direct water film evaporative air-cooling condensor system | |
| CN105423772A (en) | Power station air cooling system adopting combined refrigeration with shaft seal steam leakage of steam turbine and continuous blow-down waste heat of boiler as well as method for predicting heat-transfer coefficient of air-cooling condenser | |
| CN201715544U (en) | Flue gas waste heat recovery system | |
| US3621653A (en) | Power generation plant | |
| CN116045262A (en) | High-pressure heat storage system for generating industrial steam and application method thereof | |
| CN115680806B (en) | High-fall cyclic power generation system and method for preventing condensation and backflow of exhaust gas by utilizing steam heat preservation layer | |
| US9399928B2 (en) | Steam power plant with heat reservoir and method for operating a steam power plant | |
| CN206054018U (en) | A kind of high-pressure heater device and Steam Turbine Regenerative System for steam turbine | |
| CN110530182B (en) | Special-shaped separated heat pipe waste heat recovery evaporation device for passive ORC system | |
| US4165718A (en) | Method and apparatus for feeding condensate to a high pressure vapor generator | |
| EA039793B1 (en) | System for recycling and recovery of waste heat for mine return air | |
| CN116447510A (en) | Device system and method for recycling liquid hydrogen gasification cold energy | |
| CN203907210U (en) | Novel gasifier for liquified natural gas (LNG) | |
| RU2697652C1 (en) | Method and system of bringing a nuclear power plant into a safe state after extreme impact | |
| CN113154355A (en) | Efficient hydrophobic utilization method for boiler air heater of thermal power plant | |
| US4211188A (en) | Methods and apparatus for feeding liquid into apparatus having high pressure resistance | |
| CA1273496A (en) | Geothermal energy utilization system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |