CN109488396B - Main pipe steam waste heat energy graded heating combined heat and power system device - Google Patents
Main pipe steam waste heat energy graded heating combined heat and power system device Download PDFInfo
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- CN109488396B CN109488396B CN201811404465.8A CN201811404465A CN109488396B CN 109488396 B CN109488396 B CN 109488396B CN 201811404465 A CN201811404465 A CN 201811404465A CN 109488396 B CN109488396 B CN 109488396B
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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
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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
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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
- F01K13/00—General layout or general methods of operation of complete plants
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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
- 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
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- 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]
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- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention relates to the technical field of cogeneration by utilizing extraction steam waste pressure and waste heat of a steam turbine, in particular to a device for a steam waste heat graded heating cogeneration system of a main pipe. The steam turbine generator set comprises a steam main pipe, a steam branch pipe, a small steam turbine generator set, a heat supply network circulating water pipeline, a graded low-temperature heat source heater and a drain valve. The invention utilizes a plurality of small steam turbine generator units on the steam branch pipe to do work by expansion, utilizes different low-temperature low-pressure steam exhausts formed by the steam exhaust ports of the small steam turbines to heat circulating water of a heat supply network in a grading way, converts useful energy in the steam into electric energy to the maximum extent, uses exhaust steam (commonly called waste steam) without generating function basically for heat supply, reduces the emission of the waste steam of a power plant to the atmosphere, replaces a heat supply boiler, saves a large amount of coal resources, and greatly improves the comprehensive utilization rate of social resources.
Description
Technical Field
The invention relates to the technical field of cogeneration by utilizing the residual pressure and the residual temperature of steam of a steam extraction main pipe of a steam turbine, in particular to a device for a cogeneration system by heating the residual heat of the steam of the main pipe in a grading manner.
Background
In the actual operation process of a large-scale thermal power plant, steam in the pure condensation thermal power generation process can be converted into electricity only through high-level heat energy, and low-level heat energy is used as a cold source to be lost (accounting for more than 50 percent) and is discharged into the atmosphere to complete thermodynamic cycle; the concept of cogeneration is to convert useful heat energy which can be converted into electricity in steam into high-grade electric energy as much as possible, and to supply heat by using steam (commonly called waste steam) with less energy after power generation, so that the highest comprehensive utilization rate of social resources is achieved; the traditional combined heat and power generation mode is that the steam turbine intermediate pressure cylinder exhaust steam is used for directly heating the circulating water of a heat supply network, the circulating water reaches about 100 ℃ and is sent to users, and when a general large-sized subcritical or supercritical unit is changed from pure condensation to heat supply, a heat source can be selected to heat steam parameters: the pressure P is 0.8-1 MPa; the temperature C is 340-360 ℃, the steam contains much useful energy which can be converted into electric energy, the useful energy is directly transmitted to heat supply network water in a heat energy mode, great useful energy loss is caused, and obviously the highest comprehensive utilization rate of resources is not achieved. Therefore, the method can convert the useful energy of the steam into high-grade power energy to the maximum extent, reduce the steam pressure temperature of the heat source, ensure the supplied hot water parameters to meet the user requirements, and is a technical target for continuous pursuit and improvement of a cogeneration mode.
The Chinese invention patent (CN108035779A) discloses a waste steam waste heat recovery and heat supply system of a water-cooled steam turbine unit, which comprises a steam turbine and a corresponding condenser, wherein a waste steam leading-out system is utilized, a hole is formed on a steam exhaust pipeline of the condenser or the steam turbine to lead out waste steam, and the waste steam is conveyed to a waste steam recovery and utilization heat supply system of a steam booster through a pipeline; the heat supply system for recycling the exhaust steam of the steam booster comprises the steam booster and a steam booster condenser; the absorption type or compression type heat pump heat supply system comprises an absorption type or compression type heat pump unit, and a power steam system of the heat pump unit is connected with the steam exhaust of a steam turbine intermediate pressure cylinder; the exhaust steam recycling heat supply system of the steam booster is connected with the absorption or compression heat pump heat supply system and is connected to a heat supply pipe network; the waste heat of the exhaust steam of the water-cooled steam turbine of the thermal power plant is efficiently recycled, the utilization amount of the exhaust steam is increased, the heat supply capacity is improved, the loss of a cold end is reduced to the maximum extent, and the maximization of energy-saving benefit is realized. Therefore, the steam turbine exhaust steam recovery system and the absorption type or compression type heat pump system are combined in the water cooling unit, the advantages of the steam turbine exhaust steam recovery system and the absorption type or compression type heat pump system are exerted, the parameter matching of the whole thermodynamic system is reasonable, the operation mode is optimal, the exhaust steam utilization amount is improved, the heat supply capacity is improved, the cold end loss is reduced to the greatest extent, and the energy-saving benefit is maximized.
The Chinese invention patent (CN103363564A) discloses an energy-saving heating system for improving the utilization efficiency of low-grade steam heat energy, which is characterized by comprising a heat source, wherein one path of the heat source is connected with a low-rotation-speed industrial steam turbine through a first steam pipeline and a butterfly valve, and the other path of the heat source is connected with a heat supply network secondary heater through a second steam pipeline; the output shaft of the low-rotation-speed industrial steam turbine is connected with the steam-driven heat supply network circulating water pump through the coupler, the backpressure steam exhaust outlet of the low-rotation-speed industrial steam turbine is connected with the heat supply network primary heater through a third steam pipeline, the heat supply network water return outlet of the heat supply network primary heater is connected with the heat supply network secondary heater through a first heat supply network water return pipeline, a bypass pipe is arranged on the first heat supply network water return pipeline, the bypass pipe and the heat supply network secondary heater are both connected with a heat supply network water supply pipeline, the heat supply network water supply pipeline is connected with a heat exchange substation, the heat exchange substation is connected with the steam-driven heat supply network circulating water pump through a second heat supply network water return pipeline, condensate water pipelines of the heat supply network primary heater and the heat supply network secondary heater are. Therefore, the low-grade heat energy (conventionally low, the system can also be called high) of low-grade (0.35-0.5 MPa. a) steam is mainly used for acting to drive the low-speed 1500r/min industrial steam turbine, and the low-grade heat energy replaces a motor to drive a heat supply network circulating water pump.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art and provides a combined heat and power system device for staged heating of steam waste heat of a main pipe. The steam generator can convert the useful energy of the steam into electric energy to the maximum extent, and ensures that the parameters of the supplied hot water meet the requirements of users. Two goals of power supply and resident heat supply are realized simultaneously.
The invention aims to solve the technical problem by adopting the following technical scheme, and discloses a main pipe steam waste heat energy graded heating cogeneration system device which comprises a steam main pipe, a steam branch pipe, a small steam turbine generator unit, a heat supply network circulating water pipeline, a graded low-temperature heat source heater and a drain valve; the steam main pipe is connected with a plurality of steam branch pipes in parallel, each steam branch pipe is provided with a small steam turbine generator unit, each small steam turbine generator unit consists of a small steam turbine and a generator, a steam exhaust valve is arranged at a steam exhaust port at the tail end of the small steam turbine, and the small steam turbine generator units are connected in parallel to form a small steam turbine power generation system; the steam turbine is characterized in that a plurality of graded low-temperature heat source heaters corresponding to the number of the steam branch pipes are connected in series on the heat supply network circulating water pipeline, the graded low-temperature heat source heaters can be heated by low-temperature low-pressure steam discharged from a steam outlet of the small steam turbine, a drain valve used for controlling the drain water level is arranged between the graded low-temperature heat source heaters, the graded low-temperature heat source heating system is formed by connecting the graded low-temperature heat source heaters in series, and drain water discharged from the graded low-temperature heat source heating system goes to a host condenser.
Furthermore, a main valve is arranged at the front end of the steam main pipe, and the main valve can control the steam discharged by a medium pressure cylinder of the main steam turbine to enter the steam main pipe.
Further, a section valve is arranged on the part, located between the adjacent steam branch pipes, of the steam main pipe.
Furthermore, each steam branch pipe is provided with a steam inlet valve capable of controlling the branch pipe to open and close.
Furthermore, the front end of the heat supply network circulating water pipeline is introduced with the low-temperature circulating water of the heat supply network circulating water.
Further, the small steam turbine power generation system comprises a first small steam turbine generator unit … … and an Nth small steam turbine generator unit which are sequentially arranged on each steam branch pipe, wherein N is 2-8; the low-temperature heat source heating system comprises … … N stages of low-temperature heat source heaters which are connected in series step by step, wherein N is 2-8.
Furthermore, the first small steam turbine generator unit … … Nth small steam turbine generator unit is connected in parallel in reverse stage by stage along the steam flow direction in the steam main pipe in sequence through the steam branch pipes where the small steam turbine generator units are respectively located.
Furthermore, the first-stage low-temperature heat source heater … … N-stage low-temperature heat source heaters are sequentially connected in series along the water flow direction in the heat supply network circulating water pipeline step by step.
Further, the first small turbine exhaust steam pressure in the first small turbine generator unit heats … … the first-stage low-temperature heat source heater, the Nth small turbine exhaust steam pressure in the Nth small turbine generator unit heats the N-stage low-temperature heat source heater, the first small turbine exhaust steam pressure value and the Nth small turbine exhaust steam pressure value are gradually increased, and the pressure value range is 10KPa-105 KPa.
Further, the method for heating the cogeneration system device in a grading manner by utilizing the steam waste heat of the steam extraction main pipe to perform the cogeneration comprises the following steps:
1) a steam main pipe outputs steam with the same parameters in parallel, the steam enters a plurality of small steam turbine generator units to do work through expansion, and electric energy generated by the small steam turbine generator units is supplied to a power grid or a self-power utilization system;
2) different low-temperature low-pressure steam exhausts are formed at the steam exhaust ports of the small steam turbines, so that the whole low-temperature low-pressure steam (steam exhaust) further realizes pressure and temperature multi-level reduction and classification, and the low-to-high steam exhaust pressure steam is used as a heating heat source and is connected with heating network circulating water in series;
3) the flow of the circulating water of the heat supply network firstly enters the low-temperature heat source heater with the lowest steam exhaust pressure to carry out primary heating, and then gradually flows to the low-temperature heat source heater with the steam exhaust pressure increasing gradually and is heated in a grading way, so that the requirement of a user is met, hot water is supplied to heat a building, and the heat exchange temperature difference of the whole low-temperature heat source heating system is greatly reduced.
Compared with the prior art, the invention has the following advantages:
(1) the invention uses a main pipe steam source with higher pressure and temperature and a plurality of small steam turbines on the steam branch pipe to do work by expansion, and a plurality of different low-temperature low-pressure steam (steam exhaust) heat sources are formed at the steam exhaust ports of the small steam turbines, so that the whole low-temperature low-pressure steam further realizes the multilevel pressure and temperature reduction and classification, and the low-to-high steam exhaust pressure steam is used as a heating heat source and is connected with the circulating water of a heating heat network in series;
(2) the invention adopts a series connection mode for the graded low-temperature heat source heater, the flow of the circulating water of the heat supply network firstly enters the low-temperature heat source heater with the lowest steam exhaust pressure to carry out primary heating, and then sequentially and gradually flows to the low-temperature heat source heater with the gradually increased steam exhaust pressure and the graded heating, so that the steam exhaust heat sources of a plurality of corresponding branch pipe small steam turbines can be utilized in a gradient way, the outlet circulating water temperature of each grade of low-temperature heat source heater is close to the correspondingly heated low-temperature steam source temperature in the gradient heating process, the heat exchange temperature difference of the whole low-temperature heat source heating system is greatly reduced
The efficiency is obviously improved, and the energy-saving effect is obvious;
(3) the invention uses a plurality of dead steam (commonly called waste steam) which basically has no power generation function for heat supply, reduces the emission of the waste steam of the power plant to the atmosphere, replaces a heat supply boiler, saves a large amount of coal resources, and greatly improves the comprehensive utilization rate of social resources;
(4) the invention utilizes the expansion work of a plurality of small steam turbine generator units on the steam branch pipe to convert the steam of the main pipe containing higher useful energy into high-grade electric energy to the utmost extent, and the high-grade electric energy is supplied to power consumers.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention when five-stage heating is employed;
1-a steam main pipe; 11-a main valve; 12-a segment valve; 2-steam branch pipe; 21-a steam inlet valve; 3-a small steam turbine power generation system; 31-a first small turbo unit; 32-a second small turbo-generator unit; 33-a third small turbo-generator unit; 34-a fourth small turbo-generator unit; 35-a fifth small turbo-generator unit; 36-a steam exhaust valve; 4-heat supply network circulating water pipeline; 5-a graded low-temperature heat source heating system; 51-first stage low temperature heat source heater; 52-a secondary low temperature heat source heater; 53-three-stage low-temperature heat source heater; 54-four-stage low-temperature heat source heater; 55-five-stage low-temperature heat source heater; 6-a trap.
Detailed Description
As shown in fig. 1, the invention discloses a main pipe steam waste heat energy graded heating cogeneration system device, which comprises a steam main pipe 1, steam branch pipes 2, a small steam turbine power generation system 3, a heat supply network circulating water pipeline 4, a graded low-temperature heat source heating system 5 and a drain valve 6, wherein the steam main pipe 1 is connected with a plurality of steam branch pipes 2, the steam branch pipes 2 are provided with small steam turbine generator units, a steam exhaust valve 36 is arranged at a steam exhaust port at the tail end of a steam turbine of each small steam turbine generator unit, the heat supply network circulating water pipeline 4 is connected with the graded low-temperature heat source heating system 5 in series, the graded low-temperature heat source heating system 5 can be heated by exhaust steam at the steam exhaust port at the tail end of the steam turbine of each small steam turbine generator unit, and the drain valve 6 for controlling drain exhaust is arranged in the. And the front end of the steam main pipe 1 is provided with a main valve 11, and the main valve 11 can control the exhaust gas from a steam turbine intermediate pressure cylinder to enter the steam main pipe 1. A section valve 12 is arranged between the adjacent steam branch pipes 2 of the steam main pipe 1. And circulating water low-temperature backwater is communicated with the front end of the heat supply network circulating water pipeline 4. The steam branch pipes 2 are provided with steam inlet valves 21 capable of controlling the opening and closing of the branch pipes.
The small steam turbine power generation system 3 comprises a first small steam turbine generator unit 31, a second small steam turbine generator unit 32, a third small steam turbine generator unit 33, a fourth small steam turbine generator unit 34 and a fifth small steam turbine generator unit 35 which are sequentially arranged on each steam branch pipe 2, and the graded low-temperature heat source heating system 5 comprises a first-grade low-temperature heat source heater 51, a second-grade low-temperature heat source heater 52, a third-grade low-temperature heat source heater 53, a fourth-grade low-temperature heat source heater 54 and a fifth-grade low-temperature heat source heater 55 which are connected in series step by. The first small steam turbine generator unit 31, the second small steam turbine generator unit 32, the third small steam turbine generator unit 33, the fourth small steam turbine generator unit 34 and the fifth small steam turbine generator unit 35 are sequentially connected in parallel along the reverse direction of the steam flow direction in the steam main pipe 1 through the steam branch pipes 2 where the steam branch pipes are located.
The steam-exhaust pressure steam of the first small steam turbine generator unit 31 heats the first-stage low-temperature heat source heater 51, the steam-exhaust pressure steam of the second small steam turbine generator unit 32 heats the second-stage low-temperature heat source heater 52, the steam-exhaust pressure steam of the third small steam turbine generator unit 33 heats the third-stage low-temperature heat source heater 53, the steam-exhaust pressure steam of the fourth small steam turbine generator unit 34 heats the fourth-stage low-temperature heat source heater 54, and the steam-exhaust pressure steam of the fifth small steam turbine generator unit 35 heats the fifth-stage low-temperature heat source heater 55. The first-stage low-temperature heat source heater 51, the second-stage low-temperature heat source heater 52, the third-stage low-temperature heat source heater 53, the fourth-stage low-temperature heat source heater 54 and the fifth-stage low-temperature heat source heater 55 are sequentially connected in series along the water flow direction in the heat supply network circulating water pipeline 4. The drained water in the primary low-temperature heat source heater 51 goes to a main machine condenser. In the actual production process, the number of the units in the small steam turbine power generation system 3 can be set to 2-8 groups according to the production requirement, and the heating levels in the corresponding graded low-temperature heat source heating system 5 are also correspondingly set to 2-8 groups, so that the maximum technical and economic benefits are obtained.
During actual operation, steam exhausted from a middle pressure cylinder of the main steam turbine enters the steam main pipe 1, and is expanded to do work through the first small steam turbine generator unit 31, the second small steam turbine generator unit 32, the third small steam turbine generator unit 33, the fourth small steam turbine generator unit 34 and the fifth small steam turbine generator unit 35 on each steam branch pipe 2, and high main pipe steam residual pressure and residual heat energy is converted into electric energy to be supplied to a self-power system or a power grid of the production process. Different exhaust steam pressures of the first small steam turbine generator unit 31, the second small steam turbine generator unit 32, the third small steam turbine generator unit 33, the fourth small steam turbine generator unit 34 and the fifth small steam turbine generator unit 35 can be set according to the circulating water temperatures corresponding to the low-temperature heat source heaters in the grading low-temperature heat source heating system 5, so that low-temperature heat source steam with different pressures is connected with the grading low-temperature heat source heating system 5. The heating process of the circulating water of the heat supply network comprises the following steps: circulating water low-temperature backwater in the heat supply network circulating water pipeline 4 is respectively heated in series through a first-stage low-temperature heat source heater 51, a second-stage low-temperature heat source heater 52, a third-stage low-temperature heat source heater 53, a fourth-stage low-temperature heat source heater 54 and a fifth-stage low-temperature heat source heater 55, so that the temperature of supplied hot water reaches about 100 ℃ and is supplied to heating heat users. Therefore, useful energy in the steam is converted into electric energy to the maximum extent, the exhaust steam basically without generating effect is used for supplying heat, and after the waste heat energy of the steam of the main pipe is used for heating the combined heat and power device in a grading manner, the exhaust steam basically without generating effect is used for supplying heat, so that the emission of waste steam of a power plant to the atmosphere is reduced, a heat supply boiler is replaced, a large amount of coal resources are saved, and the comprehensive utilization rate of social resources is greatly improved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (1)
1. A method for heating a combined heat and power system device by utilizing steam waste heat of a main pipe in a grading manner to carry out combined heat and power is characterized by comprising the following steps:
1) a main pipe steam source with higher pressure and temperature outputs steam with the same parameters in parallel, the steam enters 5 small steam turbine generator units to do work through expansion, different low-temperature low-pressure steam heat sources are formed at steam outlets of the small steam turbines, the whole low-temperature low-pressure steam further achieves multi-level pressure and temperature reduction and classification, and the low-to-high steam pressure steam is used as a heating heat source and enters corresponding low-temperature heat source heaters to heat supply network circulating water in series;
2) the graded low-temperature heat source heaters are connected in series to form a graded low-temperature heat source heating system, the flow of the circulating water of the heat supply network firstly enters the low-temperature heat source heater with the lowest steam exhaust pressure to carry out primary heating, the circulating water sequentially and gradually flows to the low-temperature heat source heater with the gradually increased steam exhaust pressure and the graded heating, the steam exhaust of 5 corresponding branch small steam turbines is subjected to gradient utilization, the outlet circulating water temperature of each grade of low-temperature heat source heater is close to the temperature of the correspondingly heated low-temperature steam source, and the low-temperature heat source heater is gradually heated to the temperature required by;
3) a main pipe steam source with higher pressure and temperature outputs steam with the same parameters in parallel, the steam enters 5 small steam turbine generator units to do work through expansion, electric energy generated by the small steam turbine generator units is supplied to a power grid or a self-power utilization system, and exhaust steam of the small steam turbines serves as a heat source to supply heat for heat users;
the main pipe steam waste heat energy graded heating combined heat and power system device comprises a main steam pipe, a steam branch pipe, a small steam turbine generator unit, a heat supply network circulating water pipeline, a graded low-temperature heat source heater and a drain valve;
the steam main pipe is connected with a plurality of steam branch pipes in parallel, each steam branch pipe is provided with a small steam turbine generator unit, each small steam turbine generator unit consists of a small steam turbine and a generator, a steam exhaust valve is arranged at a steam exhaust port at the tail end of each small steam turbine, and 5 small steam turbine generator units are connected in parallel to form a small steam turbine power generation system;
the heat supply network circulating water pipeline is connected with 5 grading low-temperature heat source heaters corresponding to the number of the steam branch pipes in series, the grading low-temperature heat source heaters can be heated by low-temperature low-pressure steam discharged from a steam outlet of the small steam turbine, a drain valve for controlling the drain water level is arranged between the grading low-temperature heat source heaters, the 5 grading low-temperature heat source heaters are connected in series to form a grading low-temperature heat source heating system, and drain water of the grading low-temperature heat source heaters automatically flows to each grading low-temperature heat source heater from high to low step by step according to the steam source pressure and finally flows to a main machine condenser;
the small steam turbine power generation system comprises a first small steam turbine generator unit to a fifth small steam turbine generator unit which are sequentially arranged on each steam branch pipe;
the low-temperature heat source heating system comprises a first-stage low-temperature heat source heater to a fifth-stage low-temperature heat source heater which are connected in series step by step;
the first small steam turbine generator unit to the fifth small steam turbine generator unit are sequentially connected in parallel in a reverse stage-by-stage mode along the steam flow direction in the steam main pipe through the steam branch pipes where the first small steam turbine generator unit to the fifth small steam turbine generator unit are respectively located;
the first-stage low-temperature heat source heater to the fifth-stage low-temperature heat source heater are sequentially connected in series step by step along the water flow direction in the heat supply network circulating water pipeline;
the steam of the first small turbine exhaust pressure in the first small turbine generator unit heats the first-stage low-temperature heat source heater, the steam of the fifth small turbine exhaust pressure in the fifth small turbine generator unit heats the fifth-stage low-temperature heat source heater, the steam of the first small turbine exhaust pressure to the steam of the fifth small turbine exhaust pressure are sequentially increased step by step, and the pressure value range is 10KPa-105 KPa;
the number of the steam branch pipes, the number of the small steam turbine generator units and the number of the graded low-temperature heat source heaters are equal;
when the steam turbine works, steam discharged from a middle pressure cylinder of the main steam turbine enters a steam main pipe, and is expanded to do work through a first small steam turbine generator unit, a second small steam turbine generator unit, a third small steam turbine generator unit, a fourth small steam turbine generator unit and a fifth small steam turbine generator unit on each steam branch pipe, so that high steam residual pressure and residual heat energy of the main pipe are converted into electric energy to be supplied to a self-power system or a power grid of the production process; different first small steam turbine generator unit steam exhaust pressure, second small steam turbine generator unit steam exhaust pressure, third small steam turbine generator unit steam exhaust pressure, fourth small steam turbine generator unit steam exhaust pressure and fifth small steam turbine generator unit steam exhaust pressure are set according to circulating water temperatures corresponding to all low-temperature heat source heaters in the grading low-temperature heat source heating system, so that low-temperature heat source steam with different pressures is connected with the grading low-temperature heat source heating system;
circulating water low-temperature backwater in the circulating water pipeline of the heat supply network is respectively heated in series by a first-stage low-temperature heat source heater, a second-stage low-temperature heat source heater, a third-stage low-temperature heat source heater, a fourth-stage low-temperature heat source heater and a fifth-stage low-temperature heat source heater, so that the temperature of supplied hot water reaches about 100 ℃ and is supplied to heating heat users;
the main valve is arranged at the front end of the steam main pipe and can control the steam discharged by the intermediate pressure cylinder of the main steam turbine to enter the steam main pipe;
a section valve is arranged on the part of the steam main pipe, which is positioned between the adjacent steam branch pipes;
each steam branch pipe is provided with a steam inlet valve which can control the opening and closing of the branch pipe;
and the front end of the heat supply network circulating water pipeline is introduced with the low-temperature circulating water of the heat supply network circulating water.
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| CN114575947B (en) * | 2022-01-24 | 2024-07-19 | 中国神华煤制油化工有限公司 | Thermodynamic system, steam main pipe pressure adjusting method thereof and coal chemical waste heat utilization method |
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| CN207829963U (en) * | 2018-01-10 | 2018-09-07 | 河北冀研能源科学技术研究院有限公司 | A kind of thermal power plant's heating steam energy efficient utilizes system |
| CN108644860B (en) * | 2018-04-19 | 2023-06-30 | 北京智为蓝科技有限公司 | Exhaust steam waste heat recovery heat supply system of air cooling unit of large-scale thermal power plant |
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