CN110513165B - Combined cooling heating and power supply distributed energy system - Google Patents
Combined cooling heating and power supply distributed energy system Download PDFInfo
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- CN110513165B CN110513165B CN201910833382.9A CN201910833382A CN110513165B CN 110513165 B CN110513165 B CN 110513165B CN 201910833382 A CN201910833382 A CN 201910833382A CN 110513165 B CN110513165 B CN 110513165B
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- 238000001816 cooling Methods 0.000 title claims abstract description 32
- 238000010438 heat treatment Methods 0.000 title claims abstract description 21
- 239000007789 gas Substances 0.000 claims abstract description 87
- 238000000605 extraction Methods 0.000 claims abstract description 56
- 239000002918 waste heat Substances 0.000 claims abstract description 30
- 230000007704 transition Effects 0.000 claims abstract description 21
- 230000001105 regulatory effect Effects 0.000 claims description 24
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical compound [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 claims description 12
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 claims description 12
- 229910052794 bromium Inorganic materials 0.000 claims description 12
- 238000002485 combustion reaction Methods 0.000 claims description 9
- 238000011084 recovery Methods 0.000 claims description 9
- 230000005540 biological transmission Effects 0.000 claims description 8
- 238000005057 refrigeration Methods 0.000 claims description 3
- 238000004064 recycling Methods 0.000 claims description 2
- 238000010248 power generation Methods 0.000 abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 238000000034 method Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 9
- AMXOYNBUYSYVKV-UHFFFAOYSA-M lithium bromide Chemical compound [Li+].[Br-] AMXOYNBUYSYVKV-UHFFFAOYSA-M 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/02—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
- F01K17/025—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic in combination with at least one gas turbine, e.g. a combustion gas turbine
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
- F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
- F01K23/06—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle
- F01K23/10—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle with exhaust fluid of one cycle heating the fluid in another cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
- F22B1/18—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines
- F22B1/1807—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines using the exhaust gases of combustion engines
- F22B1/1815—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines using the exhaust gases of combustion engines using the exhaust gases of gas-turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B15/00—Sorption machines, plants or systems, operating continuously, e.g. absorption type
- F25B15/02—Sorption machines, plants or systems, operating continuously, e.g. absorption type without inert gas
- F25B15/06—Sorption machines, plants or systems, operating continuously, e.g. absorption type without inert gas the refrigerant being water vapour evaporated from a salt solution, e.g. lithium bromide
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/62—Absorption based systems
- Y02B30/625—Absorption based systems combined with heat or power generation [CHP], e.g. trigeneration
Abstract
The invention belongs to the technical field of gas power generation, and discloses a combined cooling heating and power supply distributed energy system, which comprises: the system comprises a gas turbine, a waste heat boiler, a steam turbine, a starting boiler and an auxiliary steam turbine, wherein one end of an exhaust transition section of the gas turbine is connected and communicated with an inlet end of the waste heat boiler, a tail gas bypass pipe is arranged on one side of the exhaust transition section, one end of the tail gas bypass pipe is connected and communicated with an inlet end of the starting boiler, an outlet end of the starting boiler is connected and communicated with an inlet end of the auxiliary steam turbine through an auxiliary steam delivery pipe and outputs high-temperature media to the auxiliary steam turbine, a steam extraction pipe for interstage steam extraction is arranged on one side of the steam turbine, and one end of the steam extraction pipe is connected and communicated with an inlet end of the auxiliary steam turbine.
Description
Technical Field
The invention belongs to the technical field of gas power generation, and particularly relates to a combined cooling heating and power supply distributed energy system.
Background
Nowadays, in a gas-steam combined cycle power generation unit mainly using a gas turbine, a heat source and a cold source auxiliary device are provided more, so as to realize a cold, heat and electricity triple supply distributed energy system, after the gas turbine mainly using natural gas as fuel completes work in the turbine and drives a generator, taking a gas-steam combined cycle power generation unit of S109E 2 × 180MW of GE as an example, tail gas discharged by a turbine exhaust frame of the gas turbine continues to act on each heat exchange surface of a superheater, an evaporator, an economizer and the like of a waste heat boiler, and the purpose is to force the waste heat boiler to generate high-temperature and high-pressure superheated steam, act on high-pressure and low-pressure cylinders of the turbine, drive the turbine to drive the generator to rotate and do work, and return the condensate water after work to the waste heat boiler to form a cycle, thereby realizing cycle power generation, also called rankine cycle, in the combined cycle power generation process, the cold, warm and hot starting of the unit is judged according to the temperature of the inner cylinder of the steam turbine, and in the cold starting process of the unit, a starting boiler is required to be used as auxiliary equipment for preheating the waste heat boiler and the steam turbine.
However, in the power generation process of the combined cycle unit in the prior art, when the unit is started in a warm or hot state, a start boiler is not required to be preheated, most daily start-stop units with large power grid peak regulation are started in a warm state, so that the utilization rate of the start boiler is low, the tail gas discharged after a gas turbine applies work through a turbine is about 500-565 ℃, the heat taken away by the tail gas still accounts for 35-45% of the heat value of fuel, the bad phenomenon of excessive heat value of the tail gas of the gas turbine occurs, and the steam turbine also needs to be provided with interstage steam extraction to avoid the phenomenon of water carrying between movable vanes and static vanes or humidity corrosion of final-stage vanes in the working engineering, so how to effectively utilize the tail gas of the gas turbine, the steam extraction of the steam turbine and start the boiler, improve the comprehensive efficiency of the unit, improve the utilization rate of auxiliary equipment, and become a technical problem which needs to be solved urgently.
Disclosure of Invention
The invention aims to provide a combined cooling heating and power supply distributed energy system to improve the comprehensive efficiency of a unit and improve the utilization rate of auxiliary equipment.
In order to realize the purpose of the invention, the technical scheme is as follows: a combined cooling heating and power distributed energy system comprising: the waste heat boiler is used for driving a gas turbine of a gas generator to generate power, the waste heat boiler is used for generating high-temperature and high-pressure superheated medium by utilizing tail gas of the gas turbine to generate power, the steam turbine is used for driving a steam generator to generate power by utilizing the superheated medium, the starting boiler is used for recycling tail gas of the gas turbine, and the auxiliary steam turbine is used for driving a plant power generator to generate power, the gas turbine is composed of a gas compressor, a combustion chamber and a turbine, an exhaust transition section is arranged at the outlet end of the turbine, one end of the exhaust transition section is connected and communicated with the inlet end of the waste heat boiler, the outlet end of the waste heat boiler is connected and communicated with the inlet end of the steam turbine and is used for conveying the high-temperature and high-pressure superheated medium to the steam turbine, a hot well for recovering the superheated medium after acting is arranged at the outlet end of the hot well, the outlet end of the hot well is connected and communicated with the waste heat boiler, wherein a tail gas bypass pipe is arranged at one side of the exhaust transition section, one end of the tail gas bypass pipe is connected and communicated with the inlet end of the starting boiler, the outlet end of the starting boiler is connected and communicated with the inlet end of the auxiliary turbine through an auxiliary steam transmission pipe and outputs high-temperature media to the auxiliary turbine, a steam extraction pipe for interstage steam extraction is arranged on one side of the turbine, and one end of the steam extraction pipe is connected and communicated with the inlet end of the auxiliary turbine.
The invention is further configured to: the starting boiler is provided with a first plate heat exchanger for cold and hot interaction, and the inlet end of the first plate heat exchanger is connected and communicated with the auxiliary steam conveying pipe through a steam conveying bypass pipe arranged on one side of the auxiliary steam conveying pipe.
The invention is further configured to: the outlet end of the first plate heat exchanger is provided with a first heat supply pipe for mobile heat supply, and the first heat supply pipe is sequentially provided with a first flowmeter, a first thermometer and a first flow control valve.
The invention is further configured to: the auxiliary steam turbine is provided with a second plate heat exchanger used for cold-hot interaction, one end of the second plate heat exchanger is provided with an inner inlet end and an outer outlet end, the other end of the second plate heat exchanger is provided with an inner outlet end and an outer inlet end, the inner inlet end of the second plate heat exchanger is connected and communicated with the steam extraction pipe through a first steam extraction bypass pipe arranged on one side of the steam extraction pipe, and the outer inlet end of the second plate heat exchanger is connected and communicated with the outlet end of the auxiliary steam turbine.
The invention is further configured to: the outer outlet end of the second plate heat exchanger is provided with a second heat supply pipe for mobile heat supply, the inner outlet end of the second plate heat exchanger is provided with a recovery pipe for recovering high-temperature media subjected to heat exchange, and one end of the recovery pipe is connected and communicated with the inlet end of the hot well.
The invention is further configured to: and a second flowmeter, a second thermometer and a second flow control valve are sequentially arranged on the second heat supply pipe.
The invention is further configured to: still including being used for the cryogenic bromine of official working cold machine, the entrance point of the cold machine of bromine is through locating the second steam extraction by-pass pipe of one side of steam extraction pipe with steam extraction union coupling and intercommunication, the exit end of the cold machine of bromine is equipped with the cooling pipe that supplies that is used for carrying the cold source, be equipped with in proper order on the cooling pipe and supply cold pipe flowmeter, supply cold pipe thermometer and supply cold pipe flow control valve.
The invention is further configured to: and flexible expansion joints are fixedly connected at the joint of the exhaust transition section and the inlet end of the waste heat boiler and at the joint of the tail gas bypass pipe and the inlet end of the starting boiler, and are used for compensating the axial thermal expansion difference.
The invention is further configured to: and the steam transmission bypass pipe, the first steam extraction bypass pipe and the second steam extraction bypass pipe are respectively provided with a temperature and pressure reducing regulator for regulating the temperature and pressure of a medium in the pipes.
The invention is further configured to: and a tail gas regulating valve for regulating the flow of the tail gas is arranged on the tail gas bypass pipe, and a steam regulating valve for regulating the flow of the medium is arranged on the steam extraction pipe.
In summary, compared with the prior art, the exhaust gas heat recovery system utilizes the exhaust gas of the gas turbine to heat the exhaust heat boiler and enable the exhaust heat boiler to generate high-temperature and high-pressure superheated medium for the steam turbine to do work, a Rankine cycle system is established for the steam turbine, electric energy is output to the outside by driving the gas generator and the steam generator, meanwhile, the exhaust gas bypass pipe arranged on one side of the exhaust transition section is connected with the inlet end of the starting boiler to shunt the exhaust gas of the gas turbine to the starting boiler, the auxiliary steam turbine is driven to drive the service power generator to do work by the high-temperature medium output by the starting boiler, on the other hand, the steam extraction pipe arranged on one side of the steam turbine acts on the inlet end of the auxiliary steam turbine to assist the starting boiler to drive the auxiliary steam turbine, the exhaust gas and the interstage steam extraction of the steam turbine are effectively utilized to do work, and the comprehensive efficiency of the combined cycle unit and the utilization rate of auxiliary equipment are improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic view of an overall framework of a combined cooling, heating and power distributed energy system provided in this embodiment.
Reference numerals: 1. a combustion engine; 11. a compressor; 12. a combustion chamber; 13. a turbine; 14. an exhaust transition section; 15. a tail gas bypass pipe; 151. a tail gas regulating valve; 16. a flexible expansion joint; 2. a waste heat boiler; 3. a steam turbine; 31. a hot well; 32. a steam extraction pipe; 321. a steam regulating valve; 33. a first steam extraction bypass pipe; 34. a second steam extraction bypass pipe; 35. a temperature and pressure reducing regulator; 4. starting the boiler; 41. an auxiliary steam delivery pipe; 42. a first plate heat exchanger; 43. a steam transfer bypass pipe; 44. a first heat supply pipe; 441. a first flow meter; 442. a first thermometer; 443. a first flow control valve; 5. a secondary turbine; 51. a second plate heat exchanger; 511. an inner inlet end; 512. an outer inlet end; 513. an inner outlet end; 514. an outer outlet end; 52. a second heat supply pipe; 521. A second flow meter; 522. a second thermometer; 523. a second flow control valve; 53. a recovery pipe; 6. a gas-fired power generator; 7. a steam generator; 8. a service power generator; 9. a bromine refrigerator; 91. a cold supply pipe; 911. a cooling pipe flow meter; 912. a cooling tube thermometer; 913. and a flow control valve of the cooling pipe.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and embodiments, it being understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular 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 present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Furthermore, the technical features mentioned in the different embodiments of the present invention described above may be combined with each other as long as they do not conflict with each other.
Referring to fig. 1, fig. 1 is a schematic view of an overall framework of a combined cooling, heating and power distributed energy system provided in this embodiment, including: the gas turbine comprises a gas turbine 1, a waste heat boiler 2, a steam turbine 3, a start boiler 4 and an auxiliary steam turbine 5, wherein the gas turbine 1 is a gas turbine and consists of a gas compressor 11, a combustion chamber 12 and a turbine 13, in the working process of the gas turbine, air is compressed and heated by the gas compressor 11, then is fully mixed with natural gas and is fully combusted in the combustion chamber 12, the generated high-temperature gas flows through the turbine 13 and drives the turbine 13 to rotate and do work under the action of moving and static blades of the turbine 13, so as to drive a gas generator 6 to generate electricity, and the rest tail gas after doing work enters the waste heat boiler 2 through an exhaust transition section 14, wherein the waste heat boiler 2 is sequentially provided with a superheater, an evaporator and an economizer according to the tail gas flowing direction, and is additionally provided with a steam pocket, a water feeding pump, a deaerator, a desuperheater and the like, namely the waste heat boiler 2 fully heats the working medium (water) to a superheated state by utilizing the tail gas heat energy of the gas 1, the superheat degree of a working medium is about 50 generally, under the condition, the working medium is high-temperature and high-pressure superheated steam, the superheated steam enters a high-pressure cylinder and a low-pressure cylinder of a steam turbine 3 through a main throttle valve and a main steam regulating valve of the steam turbine 3 to do work and enables the steam turbine 3 to drive a steam generator 7 to generate power, the superheated steam which does work through the steam turbine 3 is converted into condensed water and returns to a deaerator of a waste heat boiler 2 through a hot well 31 to perform next circulation, and a part of Rankine cycle is formed.
In the specific implementation process, the embodiment further comprises a starting boiler 4, the starting boiler 4 is an auxiliary device of the gas-steam combined cycle unit, in the cold starting process of the unit (the temperature of the inner cylinder of the steam turbine is less than or equal to 150 ℃), the boiler 4 is started to generate steam with a certain temperature by heating fuel oil, the steam turbine 3 and the waste heat boiler 2 are preheated and deoxidized, the working principle of the system is equal to that of the waste heat boiler 2, however, for a peak shaving unit under a large power grid, particularly a daily start-stop unit, the unit is in a warm state and a hot state, and only when the unit is started in a cold state of long-time stop due to reasons, the boiler 4 is required to be started, therefore, in the daily warm and hot running state of the unit, the starting boiler 4 is in the non-stop state, and the invention utilizes the tail gas of the combustion engine 1 to start the boiler 4 to work again, thereby improving the use utilization rate of the boiler and indirectly improving the tail gas utilization efficiency of the combustion engine 1.
Wherein, the outlet end of the turbine 13 is provided with an exhaust transition section 14, one end of the exhaust transition section 14 is connected with the inlet end of the exhaust-heat boiler 2, one side of the exhaust transition section 14 is provided with a tail gas bypass pipe 15, one end of the tail gas bypass pipe 15 is connected with the inlet end of the start boiler 4, wherein, the outlet end of the start boiler 4 is connected and communicated with the inlet end of the auxiliary turbine 5 through an auxiliary steam transmission pipe 41 and outputs high-temperature medium to the auxiliary turbine 5, one side of the turbine 3 is provided with a steam extraction pipe 32 for interstage steam extraction, one end of the steam extraction pipe 32 is connected and communicated with the inlet end of the auxiliary turbine 5, so that the tail gas of the gas turbine 1 is shunted through the tail gas bypass pipe 15 to act on the start boiler 4, meanwhile, the interstage steam extraction of the turbine 3 and the high-temperature medium output by the start boiler 4 are mixed and input to the auxiliary turbine 5 through the steam extraction pipe 32, the auxiliary turbine 5 is driven to rotate and drives the auxiliary power plant generator 8 to provide auxiliary power for all auxiliary equipment of the distributed energy system, the utilization rate of the tail gas of the combustion engine 1 and the interstage steam extraction of the steam turbine 3 is improved.
It should be noted that, a tail gas regulating valve 151 for regulating the flow rate of the tail gas is arranged on the tail gas bypass pipe 15, a steam regulating valve 321 for regulating the flow rate of the medium is arranged on the steam extraction pipe 32, the tail gas in the exhaust transition section 14 and the tail gas in the tail gas bypass pipe 15 are reasonably proportioned by regulating the tail gas regulating valve 151 and the steam regulating valve 321, the interference tail gas of the fuel gas 1 is fully utilized, the maximized recovery of the tail gas of the gas turbine 1 is realized, the interstage steam extraction amount of the steam turbine 3 is controlled by the steam regulating valve 321 in the same way, after the humidity corrosion of the water and the last stage blades between the movable and stationary blade stages of the steam turbine 3 is slowed down, the superheated medium is reasonably extracted, and the maximized medium utilization of the steam turbine 3 is realized, wherein the tail gas regulating valve 151 and the steam regulating valve 321 are both electrically-operated valves and are provided with remote/local monitoring programs, and can be remotely controlled.
As shown in fig. 1, the start-up boiler 4 is provided with a first plate heat exchanger 42 for cold and hot exchange, the inlet end of the first plate heat exchanger 42 is connected and communicated with the auxiliary steam transmission pipe 41 through a steam transmission bypass pipe 43 arranged at one side of the auxiliary steam transmission pipe 41, and the high-temperature medium in the auxiliary steam transmission pipe 41 is branched to act on the first plate heat exchanger 42, so as to achieve the purpose of heat source supply.
In the specific implementation process, the outlet end of the first plate heat exchanger 42 is provided with a first heat supply pipe 44 for mobile heat supply, the first heat supply pipe 44 is sequentially provided with a first flow meter 441, a first thermometer 442 and a first flow control valve 443, and the first heat supply pipe is used for monitoring the flow and the temperature of high-temperature water output by the first heat supply pipe 44, wherein the first flow control valve 443 is an electric valve and is provided with a driving program to a remote DCS control center for opening and closing the remote control valve, and in addition, the outer surface of the first heat supply pipe 44 is coated with a heat insulation layer for isolating from the external environment and avoiding scalding other people.
As shown in fig. 1, the secondary turbine 5 is provided with a second plate heat exchanger 51 for cold and hot exchange, one end of the second plate heat exchanger 51 is provided with an inner inlet end 511 and an outer inlet end 512, and the other end is provided with an inner outlet end 513 and an outer outlet end 514, wherein the inner inlet end 511 of the second plate heat exchanger 51 is connected and communicated with the steam extraction pipe 32 through a first steam extraction bypass pipe 33 arranged at one side of the steam extraction pipe 32, the outer inlet end 512 of the second plate heat exchanger 51 is connected and communicated with the outlet end of the secondary turbine 5, wherein the inner outlet end 513 of the second plate heat exchanger 51 is provided with a recovery pipe 53 for recovering a high-temperature medium after heat exchange, one end of the recovery pipe 53 is connected and communicated with the inlet end of the hot well 31, the outer outlet end 514 of the second plate heat exchanger 51 is provided with a second heat supply pipe 52 for mobile heat supply, i.e. the high-temperature medium in the steam extraction pipe 32 is divided through the first steam extraction bypass pipe 33 and acts on the second plate heat exchanger 51, and exchanges heat with the condensed water output from the outlet end of the secondary turbine 5, thereby achieving the purpose of heat source supply.
In the specific implementation process, the second heat supply pipe 52 is sequentially provided with a second flowmeter 521, a second thermometer 522 and a second flow control valve 523 for monitoring the flow and temperature of the high-temperature water output by the second heat supply pipe 52, wherein the second flow control valve 523 is an electric valve and is provided with a driving program to a remote DCS control center for opening and closing the remote control valve, and in addition, the outer surface of the second heat supply pipe 52 is coated with a heat insulation layer for isolating from the external environment and avoiding scalding other people.
As shown in fig. 1, the combined cooling heating and power distributed energy system further includes a bromine refrigerator 9 for office refrigeration, an inlet end of the bromine refrigerator 9 is connected and communicated with the steam extraction pipe 32 through a second steam extraction bypass pipe 34 disposed on one side of the steam extraction pipe 32, an outlet end of the bromine refrigerator 9 is provided with a cold supply pipe 91 for conveying a cold source, the cold supply pipe 91 is sequentially provided with a cold supply pipe flow meter 911, a cold supply pipe temperature meter 912, and a cold supply pipe flow control valve 913, wherein the bromine refrigerator 9 is a lithium bromide refrigerator, which is a commonly used absorption refrigerator, and uses a lithium bromide aqueous solution as a working medium to convey the cold source through the cold supply pipe 91 under the action of a high-temperature medium conveyed by the steam extraction pipe 32 by shunting of the second steam extraction bypass pipe 34, thereby achieving the purpose of office refrigeration.
In the specific implementation process, the cooling pipe flow meter 911 and the cooling pipe temperature meter 912 are used to monitor the flow and temperature of the cooling source output by the cooling pipe 91, wherein the cooling pipe flow control valve 913 is an electric valve and is provided with a driving program to a remote DCS control center for remotely controlling the opening and closing of the valve, and in addition, the outer surface of the cooling pipe 91 is coated with a thermal insulation layer for isolating the cooling pipe 91 from absorbing external heat.
As shown in fig. 1, flexible expansion joints 16 are fixedly connected to the connection between the exhaust transition section 14 and the inlet end of the waste heat boiler 2 and the connection between the exhaust bypass pipe 15 and the inlet end of the start boiler 4, the flexible expansion joints 16 are flexible elements capable of effectively compensating axial deformation, have high axial flexibility and are easy to deform, can compensate thermal expansion differences generated by different temperatures of the exhaust transition section 14 and the inlet end of the waste heat boiler 2 and the temperatures of the exhaust bypass pipe 15 and the inlet end of the start boiler 4, reduce axial loads of the thermal expansion differences, reduce temperature difference stress between the exhaust transition section 14 and the inlet end of the waste heat boiler 2 and between the exhaust bypass pipe 15 and the inlet end of the start boiler 4, avoid strength damage, instability damage, pull-out damage and the like, and prolong the service lives of the waste heat boiler 2 and the start boiler 4.
In combination with the above, the steam delivery bypass pipe 43, the first steam extraction bypass pipe 33 and the second steam extraction bypass pipe 34 are all provided with a temperature and pressure reducing regulator 35, and the temperature and pressure reducing regulator 35 is a temperature and pressure reducing device for injecting temperature reducing water into a pipeline through an electric regulating valve, and is used for regulating the temperature and pressure of the medium in the steam delivery bypass pipe 43, the first steam extraction bypass pipe 33 and the second steam extraction bypass pipe 34, so as to meet the parameter requirement of the combined cooling, heating and power supply distributed energy system.
It should be noted that the temperature and pressure reducing regulator 35 is well known in the art, and the specific structure and operation of the temperature and pressure reducing regulator 35 will not be described herein.
In conclusion, the invention has the following beneficial effects: according to the invention, a tail gas bypass pipe 15 is led out from one side of an exhaust transition section 14 and acts on a starting boiler 4, the starting boiler 4 is forced to generate a high-temperature medium and is conveyed to an auxiliary turbine 5, so that the auxiliary turbine 5 is driven to rotate and a service power generator 8 is driven to convey service power to whole plant auxiliary equipment, in addition, an output medium of the starting boiler 4 is shunted through a steam conveying bypass pipe 43 and acts on a first plate heat exchanger 42 for providing a heat source to the outside, interstage steam of a steam turbine 3 is shunted through a first steam extraction bypass pipe 33 and acts on a second plate heat exchanger 51 for providing the heat source to the outside, and interstage steam of the steam turbine 3 is shunted through a second steam extraction bypass pipe 34 and acts on a bromine cooling machine 9 for conveying a cold source to the outside, so that cold, heat and electricity combined supply is realized, and the comprehensive working efficiency of a combined cycle unit and the utilization rate of the auxiliary equipment are improved.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (9)
1. A combined cooling heating and power distributed energy system is characterized by comprising: the waste heat boiler is used for driving a gas turbine of a gas generator to generate power, the waste heat boiler is used for generating high-temperature and high-pressure superheated medium by utilizing tail gas of the gas turbine to generate power, the steam turbine is used for driving a steam generator to generate power by utilizing the superheated medium, the starting boiler is used for recycling tail gas of the gas turbine, and the auxiliary steam turbine is used for driving a plant power generator to generate power, the gas turbine is composed of a gas compressor, a combustion chamber and a turbine, an exhaust transition section is arranged at the outlet end of the turbine, one end of the exhaust transition section is connected and communicated with the inlet end of the waste heat boiler, the outlet end of the waste heat boiler is connected and communicated with the inlet end of the steam turbine and is used for conveying the high-temperature and high-pressure superheated medium to the steam turbine, a hot well for recovering the superheated medium after acting is arranged at the outlet end of the hot well, the outlet end of the hot well is connected and communicated with the waste heat boiler, wherein a tail gas bypass pipe is arranged at one side of the exhaust transition section, one end of the tail gas bypass pipe is connected and communicated with the inlet end of the starting boiler, the outlet end of the starting boiler is connected and communicated with the inlet end of the auxiliary turbine through an auxiliary steam transmission pipe and outputs high-temperature media to the auxiliary turbine, a steam extraction pipe for interstage steam extraction is arranged on one side of the turbine, and one end of the steam extraction pipe is connected and communicated with the inlet end of the auxiliary turbine.
2. The combined cooling, heating and power distributed energy system as claimed in claim 1, wherein the start-up boiler is provided with a first plate heat exchanger for cold and heat exchange, and an inlet end of the first plate heat exchanger is connected and communicated with the auxiliary steam delivery pipe through a steam delivery bypass pipe provided at one side of the auxiliary steam delivery pipe.
3. The combined cooling, heating and power distributed energy system according to claim 2, wherein a first heat supply pipe for mobile heat supply is provided at an outlet end of the first plate heat exchanger, and a first flow meter, a first temperature meter and a first flow control valve are sequentially provided on the first heat supply pipe.
4. A combined cooling, heating and power distributed energy system as claimed in claim 1, wherein the secondary turbine is provided with a second plate heat exchanger for cold and heat exchange, one end of the second plate heat exchanger is provided with an inner inlet end and an outer outlet end, and the other end of the second plate heat exchanger is provided with an inner outlet end and an outer inlet end, wherein the inner inlet end of the second plate heat exchanger is connected and communicated with the steam extraction pipe through a first steam extraction bypass pipe arranged at one side of the steam extraction pipe, and the outer inlet end of the second plate heat exchanger is connected and communicated with the outlet end of the secondary turbine.
5. The combined cooling, heating and power distributed energy system according to claim 4, wherein a second heat supply pipe for mobile heat supply is arranged at an outer outlet end of the second plate heat exchanger, a recovery pipe for recovering the high-temperature medium after heat exchange is arranged at an inner outlet end of the second plate heat exchanger, and one end of the recovery pipe is connected and communicated with an inlet end of the heat well.
6. The combined cooling, heating and power distributed energy system according to claim 5, wherein the second heating pipe is provided with a second flow meter, a second temperature meter and a second flow control valve in sequence.
7. The combined cooling, heating and power distributed energy system according to claim 1, further comprising a bromine refrigerator for office refrigeration, wherein an inlet end of the bromine refrigerator is connected and communicated with the steam extraction pipe through a second steam extraction bypass pipe arranged on one side of the steam extraction pipe, an outlet end of the bromine refrigerator is provided with a cold supply pipe for conveying a cold source, and the cold supply pipe is sequentially provided with a cold supply pipe flowmeter, a cold supply pipe thermometer and a cold supply pipe flow control valve.
8. The combined cooling, heating and power distributed energy system of claim 1, wherein flexible expansion joints are fixedly connected to the connection between the exhaust transition section and the inlet end of the waste heat boiler and the connection between the exhaust bypass pipe and the inlet end of the start-up boiler, and are used for compensating for the axial thermal expansion difference.
9. The combined cooling, heating and power distributed energy system according to claim 1, wherein a tail gas regulating valve for regulating the flow rate of the tail gas is arranged on the tail gas bypass pipe, and a steam regulating valve for regulating the flow rate of the medium is arranged on the steam extraction pipe.
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