CN111425274A - Combined heat and power generation system capable of meeting resident and industrial heat supply requirements during deep peak shaving - Google Patents

Combined heat and power generation system capable of meeting resident and industrial heat supply requirements during deep peak shaving Download PDF

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Publication number
CN111425274A
CN111425274A CN202010301664.7A CN202010301664A CN111425274A CN 111425274 A CN111425274 A CN 111425274A CN 202010301664 A CN202010301664 A CN 202010301664A CN 111425274 A CN111425274 A CN 111425274A
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China
Prior art keywords
steam
pipeline
pressure cylinder
unit
pressure
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Pending
Application number
CN202010301664.7A
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Chinese (zh)
Inventor
许风臣
高建文
汪永生
张涛
丁仕兵
王春雨
张清宇
王世明
胡长伟
全宇
谷迪
冯喜俊
夏午炎
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Jingneng Chifeng Energy Development Co ltd
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Jingneng Chifeng Energy Development Co ltd
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Priority to CN202010301664.7A priority Critical patent/CN111425274A/en
Publication of CN111425274A publication Critical patent/CN111425274A/en
Pending legal-status Critical Current

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    • 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
    • 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
    • F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
    • 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
    • F01K17/04—Using steam or condensate extracted or exhausted from steam engine plant for specific purposes other than heating
    • 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
    • F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
    • F01K7/02—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of multiple-expansion type
    • 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
    • F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
    • F01K7/16—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B33/00—Steam-generation plants, e.g. comprising steam boilers of different types in mutual association
    • F22B33/18—Combinations of steam boilers with other apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D1/00—Steam central heating systems
    • F24D1/08—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/14—Combined heat and power generation [CHP]

Abstract

A cogeneration system capable of meeting the heat supply requirements of residents and industry during deep peak shaving comprises a first steam turbine unit and a second steam turbine unit; a first-unit low-pressure bypass is arranged between the steam input pipeline of the first-unit medium pressure cylinder and the first-unit condenser, a water supply pipeline is connected with a heat exchange tube side inlet of the first-unit condenser through a dirt removing device and a first-stage heat exchange pipeline, the steam output pipeline of the first-unit medium pressure cylinder is connected with a heat exchanger steam input pipeline, the heat exchanger is connected into the heat exchanger steam input pipeline through a pipeline, a heat exchange tube side outlet of the first-unit condenser is connected with a heat exchange tube side inlet of the heat exchanger through a pressurizing pipeline and a second-stage heat exchange pipeline, and a heat exchange tube side outlet of the heat exchanger is connected with a heat supply pipeline through a pipeline; and the steam extraction port of the intermediate pressure cylinder of the second unit is connected with an industrial steam extraction pipeline, and the low-pressure bypass of the second unit is connected with the industrial steam extraction pipeline through a pipeline. Under the condition that the electric load is reduced during deep peak shaving, the requirements of resident heating and industrial heating are met.

Description

Combined heat and power generation system capable of meeting resident and industrial heat supply requirements during deep peak shaving
Technical Field
The invention relates to a cogeneration system, in particular to a cogeneration system capable of meeting the heat supply requirements of residents and industry during deep peak shaving.
Background
The cogeneration project was primarily applied in the industrial field at the earliest time, and then developed to the central heating of residents. In recent years, cogeneration projects in various regions are built and put into production, so that the urban heat supply capacity of China is continuously improved. Due to the support of relevant national policies, the development of cogeneration in China is very rapid.
The temperature is lower in northern China in winter, the heat supply of a cogeneration system needs to be increased along with the reduction of the environmental temperature, and the electric load is increased, so that the on-line electric quantity of the steam turbine set cannot meet the peak value requirement of the operating rule (for seeking an opinion) of the northeast electric auxiliary service market of the northeast energy regulatory agency in the peak value adjusting period of the heating season, the peak adjusting examination pressure is increased, and great pressure is brought to the operation situation of a company. Under the condition that the electrical load is reduced during deep peak shaving, the main steam pressure and the flow are reduced, the heating requirement of residents cannot be met, and meanwhile, the industrial steam extraction pressure is insufficient, so that the requirement of industrial steam extraction users cannot be guaranteed.
According to the relevant regulations, the start-up boiler cannot be put into use any more. The starting boiler is mainly used for a shaft seal steam supply source, a cylinder interlayer preheating steam source and the like when a single unit is started, and under the current condition, the starting boiler is not used or the starting steam provides the shaft seal steam supply source, so that the steam turbine unit cannot be safely and stably started in a single unit in a cold state and a hot state.
Therefore, how to satisfy the demands of heating and industrial heating of residents under the condition of reducing the electric load during deep peak shaving is a technical problem which needs to be solved urgently at present.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a cogeneration system capable of meeting the heating requirements of residents and industry during deep peak shaving, so that the heating requirements of residents and industry are met under the condition that the electric load is reduced during deep peak shaving.
The invention is realized by the following technical scheme: a cogeneration system capable of meeting the heat supply requirements of residents and industry during deep peak shaving comprises a first steam turbine unit and a second steam turbine unit; the steam turbine set comprises a set boiler, a set condenser, a heat exchanger and a set high-pressure cylinder, a set medium-pressure cylinder and a set low-pressure cylinder of a steam turbine, a steam outlet of the set boiler is connected with an upper steam inlet and a lower steam inlet of the set high-pressure cylinder through two set high-pressure cylinder steam input pipelines, two steam outlets of the set high-pressure cylinder are connected with a reheater inlet of the set boiler through two set high-pressure cylinder steam output pipelines, two set high-pressure cylinder steam input pipelines and two reheater outlets of the set high-pressure cylinder are provided with a set high-pressure bypass between the set high-pressure cylinder steam output pipelines, a reheater outlet of the set boiler is connected with an upper steam inlet and a lower steam inlet of the set medium-pressure cylinder through two set medium-pressure cylinder steam input pipelines, and a steam outlet of the set medium-pressure cylinder is connected with an upper steam inlet and a lower steam inlet of the set medium-pressure cylinder through a set medium-pressure cylinder steam output pipeline The steam inlet of the group low-pressure cylinder is connected, the steam outlet of the first group low-pressure cylinder is connected with the inlet of the first group condenser through a pipeline, a group low-pressure bypass is arranged between the steam input pipeline of the two first group medium-pressure cylinders and the first group condenser, a water supply pipeline is connected with the first-stage heat exchange pipeline through a dirt removing device, the first-stage heat exchange pipeline is connected with a heat exchange tube side inlet of the first unit condenser, a heat exchange tube side outlet of the first unit condenser is connected with a pressure boosting pipeline through a pipeline, the steam output pipeline of the intermediate pressure cylinder of the first unit is connected with a steam input pipeline of a heat exchanger, a steam inlet of the heat exchanger is connected with the steam input pipeline of the heat exchanger through a pipeline, the supercharging pipeline is connected with a heat exchange tube pass inlet of the heat exchanger through a secondary heat exchange pipeline, and a heat exchange tube pass outlet of the heat exchanger is connected with a heat supply pipeline through a pipeline; the steam turbine set II comprises a set II boiler, a set II condenser and a set II high-pressure cylinder, a set II medium-pressure cylinder and a set II low-pressure cylinder of the steam turbine, a steam outlet of the set II boiler is connected with an upper steam inlet and a lower steam inlet of the set II high-pressure cylinder through two set II high-pressure cylinder steam input pipelines, two steam outlets of the set II high-pressure cylinder are connected with a reheater inlet of the set II boiler through two set II high-pressure cylinder steam output pipelines, two set II high-pressure cylinder steam input pipelines are connected with two set II high-pressure cylinder steam output pipelines, a reheater outlet of the set II boiler is connected with an upper steam inlet and a lower steam inlet of the set II medium-pressure cylinder through two set medium-pressure cylinder steam input pipelines, and a steam outlet of the set II medium-pressure cylinder is connected with an upper steam inlet and a lower steam inlet of the set II low-pressure cylinder through a set II medium-pressure cylinder steam output pipeline The steam inlet of No. two unit low pressure jar connect, the steam extraction mouth of No. two unit low pressure jar pass through the pipeline with the entry linkage of No. two unit condensers, the steam extraction mouth of No. two unit intermediate pressure jar is connected with industry extraction steam line, two No. two unit intermediate pressure jar steam input pipeline with be provided with No. two unit low pressure bypasses between No. two unit condensers, No. two unit low pressure bypasses pass through the pipeline with industry extraction steam line connects.
And a temperature and pressure reducer and an electric control valve are arranged on the first unit low-pressure bypass.
And a temperature and pressure reducer and an electric control valve are arranged on the high-pressure bypass of the first unit.
The booster pipeline is composed of a plurality of pipelines connected in parallel, and valves and booster pumps are arranged on the pipelines.
The pressure pipeline and the heat supply pipeline are connected in parallel with a plurality of heat exchangers, and steam inlets of the heat exchangers are connected into the steam input pipeline of the heat exchangers through pipelines.
Still include intermediate layer heating header, the steam outlet of No. two units boiler pass through intermediate layer heating header air supply line with the steam inlet of intermediate layer heating header is connected, the steam outlet of intermediate layer heating header pass through two cylinder intermediate layer air supply lines with the upper and lower steam inlet of the cylinder intermediate layer of No. two units high-pressure cylinder is connected.
The steam outlet of the shaft seal air supply header is connected with the steam inlet of the shaft seal of the second unit high-pressure cylinder, the steam inlet of the shaft seal of the second unit medium-pressure cylinder and the steam inlet of the shaft seal of the second unit low-pressure cylinder through a shaft seal air supply pipeline, and the steam extraction port of the second unit medium-pressure cylinder is connected with the shaft seal air supply header through a second unit medium-pressure cylinder steam extraction pipeline.
And a steam outlet of the interlayer heating header is connected with a steam inlet of the shaft seal air supply header through a pipeline and a temperature and pressure reducing device.
And a temperature and pressure reducer and an electric control valve are arranged on the low-pressure bypass of the second unit.
And a temperature and pressure reducer and an electric control valve are arranged on the high-pressure bypass of the second unit.
The invention has the beneficial effects that: the invention has reasonable structure and stable work, can meet the heating requirement of residents under the condition of reducing the electric load during deep peak shaving, ensures the steam pressure and flow of an industrial park and meets the requirement of industrial heat users. The invention can ensure the safe and stable starting of the steam turbine set in a single machine cold state and a single machine hot state.
Drawings
FIG. 1 is a schematic view of a first steam turbine set;
FIG. 2 is a schematic structural view of a second steam turbine set;
fig. 3 is a schematic structural diagram of a shaft seal steam source system.
In the figure: 1-a unit high pressure cylinder; 2-a machine set intermediate pressure cylinder; 3-a unit low pressure cylinder; 4-first unit high pressure bypass; 5-first unit low-pressure bypass; 6-a unit boiler; 7-a steam input pipeline of a high-pressure cylinder of the first unit; 8-a unit high pressure cylinder steam output pipeline; 9-a steam input pipeline of a pressure cylinder in the first unit; 10-a steam output pipeline of a medium pressure cylinder of the first unit; 11-a first unit condenser; 12-water supply line; 13-a decontamination device; 14-primary heat exchange pipeline; 15-a pressurization pipeline; 16-a secondary heat exchange circuit; 17-a heat exchanger; 18-a heat supply pipeline; 19-heat exchanger steam input line; 20-second set high pressure cylinder; 21-second machine set middle pressure cylinder; 22-second unit low pressure cylinder; 23-high pressure bypass of second unit; 24-a second unit low pressure bypass; 25-group two boiler; 26-a steam input pipeline of a high-pressure cylinder of a second unit; 27-a steam output pipeline of a high-pressure cylinder of a second unit; 28-steam input pipeline of a pressure cylinder in the second unit; 29-steam output pipeline of medium pressure cylinder of the second unit; 30-a second unit condenser; 31-industrial extraction lines; 32-shaft seal air supply header; 33-interlayer heating header; 34-a shaft seal; 35-cylinder interlayer; 36-shaft seal gas supply line; 37-cylinder interlayer gas supply pipeline; 38-steam extraction pipeline of medium pressure cylinder of the second unit; 39-interlayer heating header gas supply pipeline; 40-temperature and pressure reduction device; 41-electrically controlled valve.
Detailed Description
The present invention is described in detail below with reference to the attached drawings.
As shown in fig. 1 and 2, a cogeneration system capable of meeting the demands of residential and industrial heat supply during deep peak shaving comprises a first steam turbine set and a second steam turbine set; the steam turbine set comprises a set boiler 6, a set condenser 11, a heat exchanger 17, a set high-pressure cylinder 1 of the steam turbine, a set medium-pressure cylinder 2 and a set low-pressure cylinder 3, a steam outlet of the set boiler 6 is connected with an upper steam inlet and a lower steam inlet of the set high-pressure cylinder 1 through two set high-pressure cylinder steam input pipelines 7, two steam outlets of the set high-pressure cylinder 1 are connected with a reheater inlet of the set boiler 6 through two set high-pressure cylinder steam output pipelines 8, a set high-pressure bypass 4 is arranged between the two set high-pressure cylinder steam input pipelines 7 and the two set high-pressure cylinder steam output pipelines 8, a reheater outlet of the set boiler 6 is connected with an upper steam inlet and a lower steam inlet of the set medium-pressure cylinder 2 through two set medium-pressure cylinder steam input pipelines 9, and a set medium-pressure cylinder steam output pipeline 10 are connected with a set medium-pressure cylinder steam inlet and a set low-pressure cylinder steam outlet of the set boiler 2 through two set medium-pressure cylinder steam input pipelines 9, and a set medium-pressure cylinder steam output pipeline 10 are connected with a steam inlet and a steam outlet of the set boiler The steam inlets of the pressure cylinders 3 are connected, the steam outlet of the first unit low pressure cylinder 3 is connected with the inlet of the first unit condenser 11 through a pipeline, a first unit low pressure bypass 5 is arranged between the steam input pipeline 9 of the pressure cylinder in the first unit and the first unit condenser 11, a water supply pipeline 12 is connected with a first-stage heat exchange pipeline 14 through a dirt removing device 13, the first-stage heat exchange pipeline 14 is connected with a heat exchange tube side inlet of a first unit condenser 11, a heat exchange tube side outlet of the first unit condenser 11 is connected with a booster pipeline 15 through a pipeline, a pressure cylinder steam output pipeline 10 in the first unit is connected with a heat exchanger steam input pipeline 19, a steam inlet of a heat exchanger 17 is connected into the heat exchanger steam input pipeline 19 through a pipeline, the booster pipeline 15 is connected with the heat exchange tube side inlet of the heat exchanger 17 through a second-stage heat exchange pipeline 16, and a heat exchange tube side outlet of the heat exchanger 17 is connected with a heat supply pipeline 18 through a pipeline; the second steam turbine set comprises a second set boiler 25, a second set condenser 30 and a second set high pressure cylinder 20, a second set medium pressure cylinder 21 and a second set low pressure cylinder 22 of the steam turbine, a steam outlet of the second set boiler 25 is connected with an upper steam inlet and a lower steam inlet of the second set high pressure cylinder 20 through two second set high pressure cylinder steam input pipelines 26, two steam outlets of the second set high pressure cylinder 20 are connected with a reheater inlet of the second set boiler 25 through two second set high pressure cylinder steam output pipelines 27, a second set high pressure bypass 23 is arranged between the two second set high pressure cylinder steam input pipelines 26 and the two second set high pressure cylinder steam output pipelines 27, an outlet of the second set boiler 25 is connected with an upper steam inlet and a lower steam inlet of the second set medium pressure cylinder 21 through two second set medium pressure cylinder steam input pipelines 28, a steam outlet of the second set medium pressure cylinder 21 is connected with an upper steam inlet and a lower steam inlet of the second set medium pressure cylinder 22 through a second set medium pressure cylinder steam output pipeline 29 The steam ports are connected, the steam exhaust port of the second unit low-pressure cylinder 22 is connected with the inlet of the second unit condenser 30 through a pipeline, the steam exhaust port of the second unit medium-pressure cylinder 21 is connected with an industrial steam extraction pipeline 31, a second unit low-pressure bypass 24 is arranged between the two second unit medium-pressure cylinder steam input pipelines 28 and the second unit condenser 30, and the second unit low-pressure bypass 24 is connected with the industrial steam extraction pipeline 31 through a pipeline.
Wherein, a temperature and pressure reducing device 40 and an electric control valve 41 are arranged on the first unit low pressure bypass 5. The first unit high-pressure bypass 4 is provided with a temperature and pressure reducer 40 and an electric control valve 41. The booster line 15 is constituted by a plurality of lines connected in parallel, and valves and booster pumps are provided on these lines.
During deep peak shaving, the electric control valve 41 is opened to open the first unit low-pressure bypass 5, and then the electric control valve 41 is opened to open the first unit high-pressure bypass 4. When the first-unit low-pressure bypass 5 works, the temperature and pressure reducer 40 works, part of steam of the steam input pipeline 9 of the first-unit intermediate pressure cylinder enters the first-unit low-pressure bypass 5, and is subjected to temperature and pressure reduction by the temperature and pressure reducer 40, so that the steam amount entering the first-unit intermediate pressure cylinder 2 is reduced, and the electric load is reduced. The steam is subjected to temperature and pressure reduction by the temperature and pressure reducer 40 and then enters the first-unit condenser 11 to form first-level heating of heating hot water. Meanwhile, one part of the steam output by the first set intermediate pressure cylinder 2 enters the first set low pressure cylinder 3 and then enters the first set condenser 11 to form primary heating of heating hot water, and the other part of the steam output by the first set intermediate pressure cylinder 2 enters the heat exchanger 17 through the heat exchanger steam input pipeline 19 to form secondary heating of the heating hot water. The bottom of the heat exchanger 17 is provided with a water outlet, and the steam enters the shell pass of the heat exchanger 17 to exchange heat with the heating water in the tube pass and then turns into water to be discharged from the water outlet of the heat exchanger 17.
A plurality of heat exchangers 17 are connected in parallel with the pressurizing pipeline 15 and the heat supply pipeline 18, and steam inlets of the heat exchangers 17 are connected into a heat exchanger steam input pipeline 19 through pipelines so as to further increase the secondary heating effect.
When the first unit high-pressure bypass 4 works, the temperature and pressure reducing device 40 works, part of steam of the two first unit high-pressure cylinder steam input pipelines 7 enters the first unit high-pressure bypass 4, and is subjected to temperature and pressure reduction by the temperature and pressure reducing device 40, so that the steam amount entering the first unit high-pressure cylinder 1 is reduced, and the electric load is reduced. Meanwhile, the steam of the steam output pipeline 8 of the high-pressure cylinder of the first unit is further cooled by the high-pressure bypass 4 of the first unit, so that the steam quantity and the steam temperature entering a reheater of the boiler 6 of the first unit are reduced, the heating surface of the reheater is protected, and the phenomenon that the temperature of the heating surface of the reheater is too high to cause faults is avoided.
The second unit low pressure bypass 24 is provided with a temperature and pressure reducing device 40 and an electric control valve 41. The second unit high-pressure bypass 23 is provided with a temperature and pressure reducer 40 and an electric control valve 41.
During deep peak shaving, the electric control valve 41 is opened to open the second unit low-pressure bypass 24, and then the electric control valve 41 is opened to open the second unit high-pressure bypass 23. When the second-unit low-pressure bypass 24 works, the temperature and pressure reducer 40 works, part of steam of the steam input pipeline 28 of the pressure cylinders in the second unit enters the second-unit low-pressure bypass 24, and is subjected to temperature and pressure reduction by the temperature and pressure reducer 40, so that the amount of steam entering the second-unit medium-pressure cylinders 21 is reduced, and the electric load is reduced. The steam enters the industrial steam extraction pipeline 31 after being subjected to temperature and pressure reduction by the temperature and pressure reducer 40, and is used by industrial steam extraction users, so that the steam pressure and the steam flow of an industrial park are ensured under the condition that the electric load is reduced during deep peak shaving.
One part of the steam output by the second unit medium pressure cylinder 21 enters the second unit low pressure cylinder 22 and then enters the second unit condenser 30. When the system is just started, steam with low flow and pressure and incapable of meeting the work doing requirement of the pressure cylinder 21 in the second unit enters the second unit condenser 30 through the second unit low-pressure bypass 24.
When the second-unit high-pressure bypass 23 works, the temperature and pressure reducer 40 works, part of steam of the steam input pipeline 26 of the second-unit high-pressure cylinder enters the second-unit high-pressure bypass 23, and the temperature and pressure reducer 40 reduces the temperature and the pressure so as to reduce the amount of the steam entering the second-unit high-pressure cylinder 20 and reduce the electric load. Meanwhile, the steam of the steam output pipeline 27 of the high-pressure cylinder of the second unit is further cooled by the high-pressure bypass 23 of the second unit, so that the steam quantity and the steam temperature entering a reheater of the boiler 25 of the second unit are reduced, the heating surface of the reheater is protected, and the phenomenon that the temperature of the heating surface of the reheater is too high to cause faults is avoided.
As shown in fig. 2, the sandwich heating header 33 is further included, a steam outlet of the second unit boiler 25 is connected to a steam inlet of the sandwich heating header 33 through a sandwich heating header air supply line 39, and a steam outlet of the sandwich heating header 33 is connected to upper and lower steam inlets of a cylinder sandwich 35 of the second unit high pressure cylinder 20 through two cylinder sandwich air supply lines 37. When the system is just started, steam of the boiler 25 of the second unit enters the interlayer heating header 33 through the interlayer heating header air supply pipeline 39, is conveyed into the cylinder interlayer 35 of the high-pressure cylinder 20 of the second unit through the cylinder interlayer air supply pipeline 37, and preheats the high-pressure cylinder 20 of the second unit.
Referring to fig. 2, the steam-gas separator further comprises a shaft seal gas supply header 32, a steam outlet of the shaft seal gas supply header 32 is connected with a steam inlet of a shaft seal 34 of the second unit high-pressure cylinder 20, a steam inlet of a shaft seal 34 of the second unit intermediate-pressure cylinder 21 and a steam inlet of a shaft seal 34 of the second unit low-pressure cylinder 22 through a shaft seal gas supply pipeline 36, and a steam extraction port of the second unit intermediate-pressure cylinder 21 is connected with the shaft seal gas supply header 32 through a second unit intermediate-pressure cylinder steam extraction pipeline 38. Steam of the second unit intermediate pressure cylinder 21 enters the shaft seal air supply header 32 through the steam extraction port and the second unit intermediate pressure cylinder steam extraction pipeline 38, and then enters the second unit high pressure cylinder 20, the second unit intermediate pressure cylinder 21 and the second unit low pressure cylinder 22 through the shaft seal air supply header 32 and the shaft seal air supply pipeline 36, so that the steam requirement of the shaft seal 34 is met. The steam outlet of the interlayer heating header 33 is connected with the steam inlet of the shaft seal air supply header 32 through a pipeline, a valve and a temperature and pressure reducing device 40, and the steam of the interlayer heating header 33 enters the shaft seal air supply header 32 through the temperature and pressure reducing device 40, the valve and the pipeline to supply air for the shaft seal 34 to supplement the steam.
The invention has reasonable structure and stable work, can meet the heating requirement of residents under the condition of reducing the electric load during deep peak shaving, ensures the steam pressure and flow of an industrial park and meets the requirement of industrial heat users. The invention can ensure the safe and stable starting of the steam turbine set in a single machine cold state and a single machine hot state.
Finally, it should be noted that the above-mentioned contents are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, and that the simple modifications or equivalent substitutions of the technical solutions of the present invention by those of ordinary skill in the art can be made without departing from the spirit and scope of the technical solutions of the present invention.

Claims (10)

1. The utility model provides a resident and industry heat supply demand's combined heat and power generation system when can satisfy degree of depth peak regulation, includes a steam turbine set and No. two steam turbine sets, its characterized in that: the steam turbine set comprises a set boiler, a set condenser, a heat exchanger and a set high-pressure cylinder, a set medium-pressure cylinder and a set low-pressure cylinder of a steam turbine, a steam outlet of the set boiler is connected with an upper steam inlet and a lower steam inlet of the set high-pressure cylinder through two set high-pressure cylinder steam input pipelines, two steam outlets of the set high-pressure cylinder are connected with a reheater inlet of the set boiler through two set high-pressure cylinder steam output pipelines, two set high-pressure cylinder steam input pipelines and two reheater outlets of the set high-pressure cylinder are provided with a set high-pressure bypass between the set high-pressure cylinder steam output pipelines, a reheater outlet of the set boiler is connected with an upper steam inlet and a lower steam inlet of the set medium-pressure cylinder through two set medium-pressure cylinder steam input pipelines, and a steam outlet of the set medium-pressure cylinder is connected with an upper steam inlet and a lower steam inlet of the set medium-pressure cylinder through a set medium-pressure cylinder steam output pipeline The steam inlet of the group low-pressure cylinder is connected, the steam outlet of the first group low-pressure cylinder is connected with the inlet of the first group condenser through a pipeline, a group low-pressure bypass is arranged between the steam input pipeline of the two first group medium-pressure cylinders and the first group condenser, a water supply pipeline is connected with the first-stage heat exchange pipeline through a dirt removing device, the first-stage heat exchange pipeline is connected with a heat exchange tube side inlet of the first unit condenser, a heat exchange tube side outlet of the first unit condenser is connected with a pressure boosting pipeline through a pipeline, the steam output pipeline of the intermediate pressure cylinder of the first unit is connected with a steam input pipeline of a heat exchanger, a steam inlet of the heat exchanger is connected with the steam input pipeline of the heat exchanger through a pipeline, the supercharging pipeline is connected with a heat exchange tube pass inlet of the heat exchanger through a secondary heat exchange pipeline, and a heat exchange tube pass outlet of the heat exchanger is connected with a heat supply pipeline through a pipeline; the steam turbine set II comprises a set II boiler, a set II condenser and a set II high-pressure cylinder, a set II medium-pressure cylinder and a set II low-pressure cylinder of the steam turbine, a steam outlet of the set II boiler is connected with an upper steam inlet and a lower steam inlet of the set II high-pressure cylinder through two set II high-pressure cylinder steam input pipelines, two steam outlets of the set II high-pressure cylinder are connected with a reheater inlet of the set II boiler through two set II high-pressure cylinder steam output pipelines, two set II high-pressure cylinder steam input pipelines are connected with two set II high-pressure cylinder steam output pipelines, a reheater outlet of the set II boiler is connected with an upper steam inlet and a lower steam inlet of the set II medium-pressure cylinder through two set medium-pressure cylinder steam input pipelines, and a steam outlet of the set II medium-pressure cylinder is connected with an upper steam inlet and a lower steam inlet of the set II low-pressure cylinder through a set II medium-pressure cylinder steam output pipeline The steam inlet of No. two unit low pressure jar connect, the steam extraction mouth of No. two unit low pressure jar pass through the pipeline with the entry linkage of No. two unit condensers, the steam extraction mouth of No. two unit intermediate pressure jar is connected with industry extraction steam line, two No. two unit intermediate pressure jar steam input pipeline with be provided with No. two unit low pressure bypasses between No. two unit condensers, No. two unit low pressure bypasses pass through the pipeline with industry extraction steam line connects.
2. A cogeneration system for residential and industrial heat demand at deep peak shaving according to claim 1, wherein: and a temperature and pressure reducer and an electric control valve are arranged on the first unit low-pressure bypass.
3. A cogeneration system for residential and industrial heat demand at deep peak shaving according to claim 2, wherein: and a temperature and pressure reducer and an electric control valve are arranged on the high-pressure bypass of the first unit.
4. A cogeneration system for residential and industrial heat demand at deep peak shaving according to claim 3, wherein: the booster pipeline is composed of a plurality of pipelines connected in parallel, and valves and booster pumps are arranged on the pipelines.
5. A cogeneration system for residential and industrial heat demand at deep peak shaving according to claim 4, wherein: the pressure pipeline and the heat supply pipeline are connected in parallel with a plurality of heat exchangers, and steam inlets of the heat exchangers are connected into the steam input pipeline of the heat exchangers through pipelines.
6. A cogeneration system for residential and industrial heat demand at deep peak shaving according to claim 1, wherein: still include intermediate layer heating header, the steam outlet of No. two units boiler pass through intermediate layer heating header air supply line with the steam inlet of intermediate layer heating header is connected, the steam outlet of intermediate layer heating header pass through two cylinder intermediate layer air supply lines with the upper and lower steam inlet of the cylinder intermediate layer of No. two units high-pressure cylinder is connected.
7. A cogeneration system for residential and industrial heat demand at deep peak shaving according to claim 6, wherein: the steam outlet of the shaft seal air supply header is connected with the steam inlet of the shaft seal of the second unit high-pressure cylinder, the steam inlet of the shaft seal of the second unit medium-pressure cylinder and the steam inlet of the shaft seal of the second unit low-pressure cylinder through a shaft seal air supply pipeline, and the steam extraction port of the second unit medium-pressure cylinder is connected with the shaft seal air supply header through a second unit medium-pressure cylinder steam extraction pipeline.
8. A cogeneration system for residential and industrial heat demand at deep peak shaving according to claim 7, wherein: and a steam outlet of the interlayer heating header is connected with a steam inlet of the shaft seal air supply header through a pipeline and a temperature and pressure reducing device.
9. A cogeneration system for residential and industrial heat demand at deep peak shaving according to claim 1, wherein: and a temperature and pressure reducer and an electric control valve are arranged on the low-pressure bypass of the second unit.
10. A cogeneration system for residential and industrial heat demand at deep peak shaving according to claim 1, wherein: and a temperature and pressure reducer and an electric control valve are arranged on the high-pressure bypass of the second unit.
CN202010301664.7A 2020-04-16 2020-04-16 Combined heat and power generation system capable of meeting resident and industrial heat supply requirements during deep peak shaving Pending CN111425274A (en)

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