CN111023225A - Coupling method of biomass thermoelectric unit and 300MW thermoelectric unit system - Google Patents
Coupling method of biomass thermoelectric unit and 300MW thermoelectric unit system Download PDFInfo
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- 239000002028 Biomass Substances 0.000 title claims abstract description 85
- 238000010168 coupling process Methods 0.000 title claims abstract description 21
- 238000010248 power generation Methods 0.000 claims abstract description 28
- 230000008878 coupling Effects 0.000 claims abstract description 16
- 238000005859 coupling reaction Methods 0.000 claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 125
- 238000010438 heat treatment Methods 0.000 claims description 33
- 238000002955 isolation Methods 0.000 claims description 27
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 19
- 239000003546 flue gas Substances 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 19
- 239000002918 waste heat Substances 0.000 claims description 16
- 239000000126 substance Substances 0.000 claims description 12
- 238000002485 combustion reaction Methods 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 11
- 239000000428 dust Substances 0.000 claims description 11
- 230000005540 biological transmission Effects 0.000 claims description 10
- 238000006477 desulfuration reaction Methods 0.000 claims description 10
- 230000023556 desulfurization Effects 0.000 claims description 10
- 230000003009 desulfurizing effect Effects 0.000 claims description 4
- 230000001502 supplementing effect Effects 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 2
- 238000000605 extraction Methods 0.000 claims 3
- 230000007613 environmental effect Effects 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000005611 electricity Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000000446 fuel Substances 0.000 description 4
- 238000002309 gasification Methods 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 239000000498 cooling water Substances 0.000 description 3
- 239000003245 coal Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000008236 heating water Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 238000004056 waste incineration Methods 0.000 description 1
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- 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
- F24D3/00—Hot-water central heating systems
- F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
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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
- 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
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/006—Layout of treatment plant
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- 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
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
- F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
- F24D19/1015—Arrangement or mounting of control or safety devices for water heating systems for central heating using a valve or valves
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- 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
- F24D3/00—Hot-water central heating systems
- F24D3/02—Hot-water central heating systems with forced circulation, e.g. by pumps
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- 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
- F24D3/00—Hot-water central heating systems
- F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
- F24D3/1058—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system disposition of pipes and pipe connections
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B1/00—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser
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- 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
- F24D2200/00—Heat sources or energy sources
- F24D2200/32—Heat sources or energy sources involving multiple heat sources in combination or as alternative heat sources
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Abstract
The invention discloses a coupling method of a biomass thermoelectric unit and a 300MW thermoelectric unit system, and belongs to the technical field of cogeneration. The coupling system of the biomass thermoelectric unit and the 300MW thermoelectric unit comprises a 300MW thermoelectric unit module, a biomass unit module and a heat supply pipe network module. The invention has the beneficial effects that: the biomass unit module and the 300MW thermoelectric motor component part system are in coupled operation and independent power generation, so that the economic benefit and the social environmental protection benefit of enterprises are greatly improved.
Description
Technical Field
The invention relates to a coupling system and a coupling method of a thermoelectric unit, and belongs to the technical field of cogeneration.
Background
After the global petroleum crisis in the 70 s of the 20 th century, the biomass energy is regarded as important in the global scope, and the biomass energy is characterized by wide distribution, huge reserves and regeneration. The biomass energy source not only provides renewable clean energy, but also is more environment-friendly and civil engineering. Biomass power generation is one of the most common ways for biomass energy utilization, and is the third largest non-renewable energy power generation industry following wind power and photovoltaic power generation. Under the condition that the development of the wind power and photovoltaic industries is limited by various factors, the biomass energy can be utilized to show better development toughness. The biomass cogeneration is an important way for realizing the upgrading and high-efficiency conversion and utilization of the biomass power generation industry, local materials are used in rich areas of agricultural and forestry wastes, the waste incineration is reduced, the fire coal is replaced, the pollution emission is reduced, the social and environmental benefits are far greater than the economic benefits, and the biomass cogeneration completely conforms to the supporting direction of clean heating in northern areas actively promoted by the current country.
At present, the biomass power generation technology mainly comprises 4 types, namely direct combustion power generation, gasification coupling power generation, mixed combustion power generation and methane power generation. The gasification coupling power generation heat utilization rate is low, the influence on the coal burning boiler efficiency is large, and the environment-friendly electric quantity metering is complex; the biogas has small power generation scale and high operation cost; the technology is mature, and the market range is wide.
The biomass cogeneration unit is a direct combustion power generation technology, and cannot fully show investment benefits due to higher unit manufacturing cost and operation cost. The power generation utilization of the 300MW thermoelectric generating set is low in a short time, and a large margin exists in a set equipment system, so that waste is caused; meanwhile, the problems of insufficient heat supply capacity in the heating period and insufficient steam supply during deep peak regulation of the power grid also exist. How to couple the biomass direct combustion cogeneration unit with the active 300MW thermal power unit part system, independently generate electricity and go to the Internet, supply heat and supply steam to run in a grid-connected mode, reduce the unit cost of the biomass power unit, maximize the biomass cogeneration benefit, improve the utilization rate of the 300MW thermal power unit equipment system, increase the heat supply and steam supply capacity and flexibility of a thermal power plant, and is the subject of being vigorously researched in the energy technology field.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide a coupling method of a biomass heat power unit and a 300MW thermoelectric power unit system, which can reduce the unit manufacturing cost and the operation cost of the biomass heat power cogeneration unit, improve the equipment utilization rate of the 300MW thermoelectric power unit and solve the problem of insufficient heat supply potential of a thermal power plant in the heating season.
The technical scheme of the invention is as follows: a coupling system of a biomass thermoelectric unit and a 300MW thermoelectric unit comprises a 300MW thermoelectric unit module, a biomass unit module and a heat supply pipeline network module;
the 300MW thermoelectric unit module comprises a denitration device connected with a boiler, a desulfurization tower is connected with a draught fan a through a dust remover, the desulfurization tower is connected with a chimney, the boiler is connected with a steam turbine a, the steam turbine a is connected with a condenser a and a generator a, the generator a is connected with an external power grid through a main transformer a and a control switch a, the generator a is connected with a power line a for a plant through a high-plant transformer a and a control switch b, a chemical water treatment system is connected with the condenser a, the condenser a is connected with a water cooling tower through a water inlet pipeline, and a circulating water pump a is arranged on a water return pipeline of the condenser a;
the biomass unit module comprises a biomass fluidized boiler connected with the denitration device through an induced draft fan b, the biomass fluidized boiler is connected with a steam turbine b, the steam turbine b is connected with a power generation machine b, the power generation machine b is connected with an external power grid through a main transformer b and a control switch c, the power generation machine b is connected with a power plant line b through a high plant transformer b and a control switch d, the power plant line b is connected with a power plant line a through a power transmission line, a bus-bar switch is arranged on the power transmission line, the steam turbine b is connected with a condenser b, the condenser b is connected with a chemical water treatment system, a pipeline a of the condenser b is connected with a pipeline c and a pipeline e, a pipeline b connected with the condenser b is connected with a pipeline d and a pipeline f, the pipeline c is connected with a water inlet pipeline, the pipeline d is connected with a water return pipeline, and the pipeline c and the, an isolation switching valve c is arranged on the pipeline e, and an isolation switching valve d is arranged on the pipeline f;
the heat supply pipe network module comprises a heat supply pipe network heater b connected with the pipeline e, the heat supply pipe network is also connected with a heat supply pipe network heater a, the steam turbine a is connected with the heat supply pipe network heater a and the heat supply pipe network heater b through a control valve a, a water return pipe is connected with the heat supply pipe network heater a, a heat supply pipe network circulating pump a and a control valve b are arranged on the water return pipe, a pipeline f is connected with the water return pipe, and a heat supply pipe network circulating pump b is arranged on the pipeline f.
The invention also claims a working method of a coupling system of the biomass thermoelectric unit and the 300MW thermoelectric unit, which comprises a working method of power generation in a non-heating season and a working method of heat supply in a heating season;
the working method for generating power in the non-heating season comprises the following steps:
a1, after work of a steam turbine b of the biomass unit module, the exhaust steam exchanges heat with circulating water in a condenser b, the circulating water enters a cooling tower through a pipeline a, a pipeline c, an isolation switching valve a and a water inlet pipeline to release heat, and cold water after heat exchange returns to the condenser b through a circulating water pump a, a water return pipeline, a pipeline d, an isolation switching valve b and a pipeline b;
a2, sucking flue gas generated by combustion of a biomass fluidized bed boiler into a tail flue of a 300MW thermoelectric generator set module by a draught fan b, sucking by a draught fan a, passing through a denitration device, a dust remover and a desulfurization tower, and discharging into the atmosphere by a chimney when the ultra-clean emission standard is reached;
a3, a control switch c is closed, a control switch d is opened, a bus tie switch is closed, the service power line a is communicated with the service power line b through a power transmission line, the control switch a is opened, the control switch b is opened, a generator a of the 300MW thermal motor set module only supplies power to the service power system, and the generators b of the biomass unit module all access to a power grid;
a4, supplementing water by a biomass unit condenser b, and supplying the water by a 300MW thermal power unit chemical water treatment system;
the working method for supplying heat in the heating season comprises the following steps:
b1, in the initial stage and the final stage of heating, closing the control valve a and the control valve B, boosting the return water of the return water pipe by a heat supply network circulating pump B, feeding the return water into a condenser B through a pipeline f, an isolation switching valve d and a pipeline B, exchanging heat of the return water and exhaust steam after the power of a turbine B of the biomass unit module in the condenser B, and feeding the waste heat circulating water after heat exchange into a heat supply pipeline through the pipeline a, the isolation switching valve c, a pipeline e and the heat supply network heater B;
b2, in the middle heating period, both the control valve a and the control valve B are opened, one path of return water of the return water pipe is pumped into the condenser B through the heat supply network circulating pump B, exhausted steam after the power of the steam turbine B of the biomass unit module is exhausted in the condenser B and exchanges heat with one path of return water of the return water pipe to form waste heat circulating water, the waste heat circulating water enters the heat supply network heater B, enters the heat supply pipeline after exchanging heat with extracted steam of the steam turbine a in the heat supply network heater B, the other path of return water of the water pipeline enters the heat supply network heater a through the heat supply network circulating pump a, and enters the heat supply pipeline after exchanging heat with extracted steam of the steam turbine a of the 300MW heat supply unit module.
In the initial stage and the final stage of heating, the temperature of the waste heat circulating water entering the heat supply pipeline is 50-60 ℃.
The invention has the beneficial effects that: 1. the biomass unit module is coupled with a 300MW thermal power unit according to different seasons of heating seasons and non-heating seasons: in summer, the exhausted steam and the circulating cooling water exchange heat after the steam turbine of the biomass unit module performs power function, and the circulating water enters the circulating water of the 300MW thermoelectric unit and a water cooling tower system to release heat, so that the unit is ensured to run safely; in the heating season, the waste steam and the circulating cooling water exchange heat after the steam turbine power of the biomass unit module directly supply heat to residents in the early and later periods of heat supply, and the steam is extracted by a steam secondary heating of a steam turbine of a 300MW thermoelectric unit in the middle period of heat supply to the residents to supply heat, so that the heat loss of the exhaust steam of the biomass unit is reduced, and the circulating heat efficiency is improved. 2. In addition, because biomass unit module and 300MW thermoelectric unit remove above-mentioned system coupling, still with system couplings such as station service system, afterbody flue and denitration dust removal desulfurization system, the process water is direct to be supplied by 300MW thermoelectric unit chemical water processing system, makes biomass thermoelectric module unit cost reduce by a wide margin, and the net is gone on in the full amount of electricity generation, obtains higher power generation benefit. 3. The biomass unit module is independently grid-connected to generate electricity, meets the requirements of national industrial policies, and is simple in environment-friendly electricity metering and convenient to apply compared with a gasification coupling power generation technology; meanwhile, the biomass thermoelectric unit is different from a gasification coupling power generation technology, is used for direct combustion power generation, and is independent from the combustion of a 300MW thermoelectric unit hearth without mutual interference. 4. The biomass unit module and the 300MW thermoelectric unit share a plurality of systems, so that the system margin of the 300MW thermoelectric unit equipment is reasonably utilized, and the heat supply capacity and flexibility of the thermal power plant are improved. 5. Flue gas generated by combustion of the biomass unit utilizes 300MW thermoelectric unit denitration, dust removal and desulfurization environmental protection equipment, so that the ultra-clean emission requirement is easily met, and the requirements of national environmental protection policies can be better met. 6. The extracted steam of the biomass unit can also be used as a medium-low pressure auxiliary steam of a 300MW thermoelectric unit or a standby steam source of industrial extracted steam, so that the industrial steam supply capacity and the system operation safety and flexibility are improved, and the maintenance and operation cost of a power plant starting boiler is reduced. In the aspect of production, operation and management, the number of fixed personnel can be reduced, the use efficiency of production consumables is improved, and the method has very good application value. 7. The biomass unit module and the 300MW thermoelectric motor unit are in coupled operation and independent power generation, so that the economic benefit of an enterprise and the social environmental protection benefit are greatly improved.
Drawings
FIG. 1 is a schematic view of the structure of the present invention.
The reference numbers in the figures are as follows: 1. boiler, 2, steam turbine a, 3, generator a, 4, condenser a, 5, induced draft fan a, 6, denitration device, 7, dust remover, 8, desulfurizing tower, 9, chimney, 10, high plant transformer a, 11, biomass fluidized boiler, 12, steam turbine b, 13, generator b, 14, condenser b, 15, induced draft fan b, 16, heat network heater a, 17, heat network heater b, 18, heat network circulating pump a, 19, heat network circulating pump b, 20, high plant transformer b, 21, bus-bar switch, 22, circulating water pump a, 23, cooling tower, 24, main transformer a, 25, chemical water treatment system, 26, water return pipeline, 27, water inlet pipeline, 28, pipeline a, 29, pipeline b, 30, pipeline c, 31, pipeline d, 32, pipeline e, 33, pipeline f, 34, isolation switching valve a, 35, isolation switching valve b, 36. the heat supply system comprises isolation switching valves c and 37, isolation switching valves d and 38, a heat supply pipeline 39, a water return pipe 40, main transformers b and 41, control switches b and 42, control switches d and 43, service lines a and 44, service lines b and 45, a power transmission line 46, control valves a and 47, control valves b, 100 MW thermoelectric unit modules, 300MW thermoelectric unit modules, 200 biomass unit modules and 300 heat supply pipe network modules.
Detailed Description
The invention is further illustrated with reference to figure 1:
a coupling system of a biomass thermoelectric unit and a 300MW thermoelectric unit comprises a 300MW thermoelectric unit module 100, a biomass unit module 200 and a heat supply pipe network module 300; the 300MW thermoelectric power unit module 100 comprises a denitration device 6 connected with a boiler 1, a desulfurization tower 8 connected with a draught fan a5 through a dust remover 7, a chimney 9 connected with the desulfurization tower 8, a steam turbine a2 connected with the boiler 1, a steam turbine a2 connected with a condenser a4 and a generator a3, a generator a3 connected with an external power grid through a main transformer a24 and a control switch a, a generator a3 connected with a plant power line a43 through a high plant transformer a10 and a control switch b41, a chemical water treatment system 25 connected with a condenser a4, a condenser a4 connected with a cooling tower 23 through a water inlet pipeline 27, and a circulating water pump a22 arranged on a water return pipeline 26 of the condenser a 4; the biomass plant module 200 comprises a biomass fluidized boiler 11 connected with the denitration device 6 through an induced draft fan b15, the biomass fluidized boiler 11 is connected with a steam turbine b12, the steam turbine b12 is connected with a generator b13, the generator b13 is connected with an external power grid through a main transformer b40 and a control switch c, the generator b13 is connected with a plant power line b44 through a high plant power transformer b20 and a control switch d42, the plant power line b44 is connected with a plant power line a43 through a power transmission line 45, the power transmission line 45 is provided with a bus switch 21, the steam turbine b12 is connected with a condenser b12, the condenser b12 is connected with a chemical water treatment system 25, a pipeline a 12 of the condenser b12 is connected with a pipeline c 12 and a pipeline e 12, a pipeline b12 connected with the condenser b12 is connected with a pipeline d 12 and a pipeline f 12, the pipeline c 12 is connected with a water return pipeline d 12, and an isolation switching valve 12 and a switch valve respectively arranged on the pipeline 12, an isolation switching valve c36 is arranged on the pipeline e32, and an isolation switching valve d37 is arranged on the pipeline f 33; the heat supply pipe network module 300 comprises a heat supply network heater b17 connected with the pipeline e32 and connected with a heat supply pipeline 38, the heat supply pipeline 38 is further connected with a heat supply network heater a16, a steam turbine a2 is connected with the heat supply network heater a16 and the heat supply network heater b17 through a control valve a46, a water return pipe 39 is connected with the heat supply network heater a16, a heat supply network circulating pump a18 and a control valve b47 are arranged on the water return pipe 39, a pipeline f33 is connected with the water return pipe 39, and a heat supply network circulating pump b19 is arranged on the pipeline f 33.
The working method of the coupling system of the biomass thermoelectric unit and the 300MW thermoelectric unit comprises a working method of power generation in a non-heating season and a working method of heat supply in a heating season;
the working method for generating power in the non-heating season comprises the following steps:
a1, waste steam generated after work of a turbine b12 of the biomass unit module 200 exchanges heat with circulating water in a condenser b14, the circulating water enters a water cooling tower 23 through a pipeline a28, a pipeline c30, an isolation switching valve a34 and a water inlet pipeline 27 to release heat, and cold water after heat exchange returns to the condenser b14 through a circulating water pump a22, a water return pipeline 26, a pipeline d31, an isolation switching valve b35 and a pipeline b 29;
a2, sucking flue gas generated by combustion of a biomass fluidized bed boiler into a tail flue of a 300MW thermoelectric unit module 100 by a draught fan b15, sucking the flue gas by a draught fan a5, passing through a denitration device 6, a dust remover 7 and a desulfurization tower 8, and exhausting the flue gas into the atmosphere by a chimney 9 when the flue gas reaches an ultra-clean emission standard;
a3 and a control switch c are closed, a control switch d42 is opened, a bus tie switch 21 is closed, the service power line a43 is communicated with the service power line b44 through a power transmission line 45, the control switch a is opened, the control switch b41 is opened, a generator a3 of the 300MW thermoelectric unit module 100 only supplies power to a service power system, and a generator b13 of the biomass unit module 200 generates power and is completely connected to a power grid;
a4 and a biomass unit condenser b14 are used for supplementing water and are supplied by a 300MW thermoelectric unit chemical water treatment system 25;
the working method for supplying heat in the heating season comprises the following steps:
b1, in the initial stage and the final stage of heating, closing a control valve a46 and a control valve B47, boosting the pressure of return water of a return water pipe 39 by a heat supply network circulating pump B19, feeding the return water into a condenser B14 by a pipeline f33, an isolation switching valve d37 and a pipeline B29, exchanging heat of exhaust steam after the return water works with a steam turbine B12 of the biomass unit module 200 in the condenser B14, and feeding the waste heat circulating water after heat exchange into a heat supply pipeline 38 by a pipeline a28, an isolation switching valve c36, a pipeline e32 and a heat supply network heater B17;
b2, in the middle stage of heating, both the control valve a46 and the control valve B47 are opened, one path of return water of the return water pipe 39 is pumped into the condenser B14 through the heat network circulating pump B19, after the turbine B12 of the biomass unit module 200 works, exhaust steam exchanges heat with one path of return water of the return water pipe 39 in the condenser B14 to form waste heat circulating water, the waste heat circulating water enters the heat network heater B17, after the exhaust steam exchanges heat with the steam extracted by the turbine a2 in the heat network heater B17, the waste heat circulating water enters the heat supply pipeline 38, the other path of return water of the water pipe 39 enters the heat network heater a16 through the heat network circulating pump a18, and after the exhaust steam exchanges heat with the turbine a2 of the 300MW thermoelectric unit module 100 in the heat network heater a 16. In the initial stage and the final stage of heating, the temperature of the waste heat circulating water entering the heat supply pipeline 38 is 50-60 ℃.
Examples
The 300MW thermoelectric power generation unit 100 module is based on a 300 MW-grade unit and is also suitable for subcritical, supercritical and ultra-supercritical thermoelectric power generation unit production modules 100 with the power of 300MW and above.
In the 300MW thermoelectric unit module 100, fuel is combusted in a boiler 1 to heat water, generated high-temperature and high-pressure steam pushes a steam turbine a2 to rotate at a high speed and drives a coaxially connected generator a3 to generate electricity, exhausted steam after work enters a condenser a4, the exhausted steam exchanges heat with circulating water in the condenser a4 to be condensed, and then the temperature and the pressure are raised and the supplied to the boiler 1 to form a complete thermodynamic cycle system; the fuel burns in the boiler 1 to generate flue gas, the flue gas is sucked by a draught fan a5 to enter a tail flue, and the flue gas passes through a denitration device 6, a dust remover 7 and a desulfurizing tower 8 to reach the requirement of ultra-clean emission standard and is discharged to the atmosphere through a chimney 9 to form a complete flue gas system; the circulating water after heat exchange is cooled by heat release of the cooling water tower 23 and is sent back to the condenser a4 by the circulating water pump a22, so that a complete exhaust steam cooling system is formed.
In the heating season, the heat supply network module 300 sends the backwater after heating and heat exchange of residents to the heat supply network heater a16 through the heat supply network circulating water pump a18, the heat supply network heater a16 and the steam turbine a2 extract steam for heat exchange and heat rise, the heated heat supply network circulating water is supplied to resident heating users for heat exchange, and closed circulation of a heat supply system is formed.
In the biomass unit module 200, biomass fuel is combusted in the biomass fluidized boiler 11 to heat water, the generated high-temperature and high-pressure steam pushes the steam turbine b12 to rotate at a high speed and drives the coaxially connected generator b13 to generate electricity, and the exhausted steam after work enters the condenser b 14; the biomass fuel is combusted in the biomass fluidized boiler 11 to generate flue gas, and the flue gas is sucked and discharged by the induced draft fan b15 to form a complete flue gas system.
In a non-heating season, the biomass unit module 200 sends the circulating water after the steam exhaust of the steam turbine b12 to the water cooling tower 23 of the 300MW thermoelectric unit module 100 by using an isolation switching valve to release heat; the flue gas generated by the combustion of the biomass fluidized boiler 11 is pumped by an induced draft fan b15 and sent to a tail flue of the boiler 1, and is exhausted into the atmosphere by a chimney 9 after passing through a denitration device 6, a dust remover 7 and a desulfurizing tower 8 and reaching the ultra-clean emission standard; the factory power system of the biomass unit module 200 is supplied by the 300MW thermal power plant factory power system through the bus-tie switch 21, so that the biomass unit module 200 generates power and is completely on line; the production water of the biomass unit module 200 is supplied by the chemical water treatment system 25 of the 300MW thermoelectric unit module 100, so that the coupling of the biomass unit and the 300MW thermoelectric unit 100 is realized, and the grid-connected power generation is independent.
In the heating season, the isolation switching valve isolates the waste heat circulating water after the biomass unit module 200 cools the steam turbine b12 exhausted steam from the circulating water of the 300MW thermoelectric unit module 100 and the water cooling tower 23, the waste heat circulating water is sent to the heat supply network heater b17 by the heat supply network circulating water pump b19, and after the heat supply network heater b17 and the steam turbine a2 extract steam for heat exchange, the waste heat circulating water is sent to the resident heating water supply pipeline, so that the heating capacity and flexibility of the thermal power plant are improved.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (3)
1. A coupling system of a biomass thermoelectric unit and a 300MW thermoelectric unit is characterized by comprising a 300MW thermoelectric unit module (100), a biomass unit module (200) and a heat supply pipe network module (300);
the 300MW thermal power unit module (100) comprises a denitration device (6) connected with a boiler (1), a desulfurization tower (8) is connected with an induced draft fan a (5) through a dust remover (7), the desulfurization tower (8) is connected with a chimney (9), the boiler (1) is connected with a steam turbine a (2), the steam turbine a (2) is connected with a condenser a (4) and a generator a (3), the generator a (3) is connected with an external power grid through a main transformer a (24) and a control switch a, the generator a (3) is connected with a service power line a (43) through a high-rise transformer a (10) and a control switch b (41), a chemical water treatment system (25) is connected with the condenser a (4), the condenser a (4) is connected with a water cooling tower (23) through a water inlet pipeline (27), and a circulating water pump a (22) is arranged on a water return pipeline (26) of the condenser a (4);
the biomass unit module (200) comprises a biomass fluidized boiler (11) connected with a denitration device (6) through an induced draft fan b (15), wherein a steam turbine b (12) is connected with the biomass fluidized boiler (11), the steam turbine b (12) is connected with a generator b (13), the generator b (13) is connected with an external power grid through a main transformer b (40) and a control switch c, the generator b (13) is connected with a power plant electric line b (44) through a high-power plant transformer b (20) and a control switch d (42), the power plant electric line b (44) is connected with a power plant electric line a (43) through an electric transmission line (45), a bus coupler switch (21) is arranged on the electric transmission line (45), the steam turbine b (12) is connected with a condenser b (14), the condenser b (14) is connected with a chemical water treatment system (25), and a pipeline a (28) of the condenser b (14) is connected with a pipeline c (30) and a pipeline e (32), a pipeline b (29) connected with the condenser b (14) is connected with a pipeline d (31) and a pipeline f (33), the pipeline c (30) is connected with a water inlet pipeline (27), the pipeline d (31) is connected with a water return pipeline (26), an isolation switching valve a (34) and an isolation switching valve b (35) are respectively arranged on the pipeline c (30) and the pipeline d (31), an isolation switching valve c (36) is arranged on the pipeline e (32), and an isolation switching valve d (37) is arranged on the pipeline f (33);
heat supply pipe network module (300) include, with heat supply pipe (38) are connected in heat supply network heater b (17) that pipeline e (32) are connected, heat supply pipe (38) are still connected heat supply network heater a (16), and steam turbine a (2) are connected heat supply network heater a (16) and heat supply network heater b (17) through control valve a (46), and heat supply network heater a (16) are connected in wet return (39), are equipped with heat supply network circulating pump a (18) and control valve b (47) on wet return (39), and wet return (39) are connected in pipeline f (33), are equipped with heat supply network circulating pump b (19) on pipeline f (33).
2. The method for operating the coupling system of the biomass thermoelectric power unit and the 300MW thermoelectric power unit as claimed in claim 1, wherein the method comprises an operation method of power generation in a non-heating season and an operation method of heat supply in a heating season;
the working method for generating power in the non-heating season comprises the following steps:
a1, after work of a steam turbine b (12) of a biomass unit module (200), exhaust steam exchanges heat with circulating water in a condenser b (14), the circulating water enters a water cooling tower (23) through a pipeline a (28), a pipeline c (30), an isolation switching valve a (34) and a water inlet pipeline (27) to release heat, and cold water after heat exchange returns to the condenser b (14) through a circulating water pump a (22), a water return pipeline (26), a pipeline d (31), an isolation switching valve b (35) and a pipeline b (29);
a2, sucking flue gas generated by combustion of a biomass fluidized bed boiler by a draught fan b (15), feeding the flue gas into a tail flue of a 300MW thermoelectric unit module (100), sucking the flue gas by a draught fan a (5), passing through a denitration device (6), a dust remover (7) and a desulfurizing tower (8), and discharging the flue gas into the atmosphere by a chimney (9) when the flue gas reaches an ultra-clean discharge standard;
a3, a control switch c is closed, a control switch d (42) is opened, a bus tie switch (21) is closed, a power station power supply line a (43) is communicated with a power station power supply line b (44) through a power transmission line (45), the control switch a is opened, a control switch b (41) is opened, a generator a (3) of a 300MW thermoelectric generator set module (100) only supplies power to a power station power supply system, and a generator b (13) of a biomass unit module (200) generates power and is completely connected to a power grid;
a4, supplementing water to a biomass unit condenser b (14), and supplying the water by a 300MW thermoelectric unit chemical water treatment system (25);
the working method for supplying heat in the heating season comprises the following steps:
b1, in the initial stage and the final stage of heating, closing a control valve a (46) and a control valve B (47), boosting the pressure of return water of a return water pipe (39) through a heat supply network circulating pump B (19), entering a condenser B (14) through a pipeline f (33), an isolation switching valve d (37) and a pipeline B (29), exchanging heat of the return water and exhaust steam after the work of a steam turbine B (12) of the biomass unit module (200) in the condenser B (14), and enabling waste heat circulating water after heat exchange to enter a heat supply pipeline (38) through a pipeline a (28), an isolation switching valve c (36), a pipeline e (32) and a heat supply network heater B (17);
b2, in the middle heating period, both the control valve a (46) and the control valve B (47) are opened, one path of return water of the return water pipe (39) is pumped into the condenser B (14) through the heat supply network circulating pump B (19), after work of the steam turbine B (12) of the biomass unit module (200), exhaust steam is subjected to heat exchange with one path of return water of the return water pipe (39) in the condenser B (14) to form waste heat circulating water, the waste heat circulating water enters the heat supply network heater B (17), and enters the heat supply pipeline (38) after being subjected to heat exchange with steam extraction of the steam turbine a (2) in the heat supply network heater B (17), and the other path of return water of the return water pipe (39) enters the heat supply network heater a (16) through the heat supply network circulating pump a (18), and enters the heat supply pipeline (38) after being subjected to heat extraction with the steam extraction of the steam turbine a (2) of.
3. The method for operating the coupling system of the biomass thermoelectric power unit and the 300MW thermoelectric power unit according to claim 2, wherein the temperature of the waste heat circulating water entering the heat supply pipeline (38) is 50-60 ℃ in the initial stage and the final stage of the heat supply.
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