CN107664046B - Energy-saving starting system of IGCC power station - Google Patents
Energy-saving starting system of IGCC power station Download PDFInfo
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- CN107664046B CN107664046B CN201710863515.8A CN201710863515A CN107664046B CN 107664046 B CN107664046 B CN 107664046B CN 201710863515 A CN201710863515 A CN 201710863515A CN 107664046 B CN107664046 B CN 107664046B
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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
- 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
- F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
- F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
- F01K23/06—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle
- F01K23/10—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle with exhaust fluid of one cycle heating the fluid in another cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C6/00—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas- turbine plants for special use
- F02C6/18—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas- turbine plants for special use using the waste heat of gas-turbine plants outside the plants themselves, e.g. gas-turbine power heat plants
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2220/00—Application
- F05D2220/70—Application in combination with
- F05D2220/72—Application in combination with a steam turbine
- F05D2220/722—Application in combination with a steam turbine as part of an integrated gasification combined cycle
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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
- Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
- Y02E20/18—Integrated gasification combined cycle [IGCC], e.g. combined with carbon capture and storage [CCS]
Abstract
An energy-saving starting system of an IGCC power station is formed by connecting a coal gasification unit, an air separation unit, a gas turbine generator, an afterburner, a waste heat boiler, a steam turbine generator and a flare tower; when the power station is started, firstly, an air separation unit and a coal gasification unit are started, then, the synthetic gas generated by the coal gasification unit is sent to an afterburner to start a waste heat boiler and a steam turbine power generation system, and after the gas turbine is started and switched into synthetic gas fuel, the afterburner is cut off to operate; the method has the advantages that the sequence limitation that the waste heat boiler and the steam turbine have to wait for the first starting of the gas turbine in the conventional starting process is relieved, the steam turbine can be started in advance of the gas turbine, the starting time of the whole plant is shortened, the links of waiting for the warm-up, the flushing and the grid connection of the steam turbine in the load rising process after the ignition of the gas turbine are omitted, the gas turbine can quickly lift the load and perform fuel switching, and the energy saving effect is remarkable.
Description
Technical Field
The invention relates to the technical field of clean coal-fired power generation, in particular to an energy-saving starting system of an IGCC power station.
Background
IGCC (integrated gasification combined cycle) power generation technology has been accumulated and practiced for many years, the operation technology is gradually perfected, the reliability is greatly improved, and the annual power generation availability hours are comparable with those of a conventional coal-fired power plant. However, the existing starting method of the IGCC power station is not perfect, the starting process consumes long time, and the energy waste and the high starting cost are prominent problems in the starting process of the IGCC power station.
On the one hand, in order to ensure the reliability of the IGCC power plant and to increase the flexibility of the overall system, many of the IGCC power plants employ independent electrically driven air separation units, with the air compressors and superchargers of the electric air separation systems being the most power hungry consumers of the IGCC power plant. In the starting process of the IGCC power station, the air separation system must be started first, when the IGCC power station does not generate electricity yet, the power station must purchase electricity from the power grid to meet the electricity consumption of the air separation unit, and the power supply of the air separation unit can be switched to station power after the whole power generation system of the power station is stable. Therefore, if the whole plant starting process is too slow, the power consumption of the space division system is increased, and the electricity purchasing cost is increased. On the other hand, in the IGCC system, the gas turbine, the exhaust-heat boiler and the steam turbine form a combined cycle system, the exhaust-heat boiler utilizes the exhaust heat of the exhaust gas turbine to generate steam and send the steam to the steam turbine to generate power, if the steam turbine is started, the gas turbine needs to be started first, the speed of warm-up, flushing and grid connection of the steam turbine is slower, the process requires the gas turbine to be kept waiting at a low load, the gas turbine needs to be started by using light diesel, the gas turbine can be switched into synthetic gas fuel after the load of the gas turbine is increased to about 55% -70% of rated load, the cost of burning the light diesel is high, and in the process of starting the gas turbine by matching with the steam turbine, the light diesel needs to be continuously burned for a long time because the gas turbine is kept at a lower load. In addition, as the gas turbine is matched with the steam turbine for starting, the gas turbine can not be switched into the synthetic gas fuel after being delayed due to long duration of low load, and the synthetic gas fuel generated by the gasifier can only be sent to the flare stack to be burned off, so that energy waste is caused. In comprehensive view, the typical starting method of the existing IGCC power station has the problems of long starting time, high power consumption and oil consumption, serious energy waste and high starting cost.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide an energy-saving starting system of an IGCC power station, which shortens the starting time of the whole plant, reduces the power consumption, the fuel consumption and the discharge amount of a synthetic gas torch in the starting process, and reduces the starting cost.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
the energy-saving starting system of the IGCC power station comprises a coal gasification unit 2, wherein a coal dust inlet of the coal gasification unit 2 is connected with coal dust 1, an oxygen inlet of the coal gasification unit 2 is connected with an oxygen outlet of an air separation unit 3, a first air 5 is sucked into an air compressor 4 inlet of the air separation unit 3, a synthetic gas outlet of the coal gasification unit 2 is divided into three paths, the first path is connected with a flare tower 20, the second path is connected with a afterburner 11, and the third path is connected with a combustion chamber of a gas turbine 7; the air compressor inlet of the gas turbine 7 sucks in the second air 6, the combustion chamber inlet of the gas turbine 7 inputs the light diesel 8, the rigid shaft of the gas turbine 7 is connected with the gas turbine generator 13, the first exhaust gas 12 of the gas turbine 7 is communicated with the flue inlet of the exhaust-heat boiler 14, the second exhaust gas 19 of the exhaust-heat boiler 14 is discharged into the atmosphere;
the air inlet of the afterburner 11 is connected with the outlet of the afterburner fan 10, the inlet of the afterburner fan 10 sucks third air 9, the outlet of the afterburner 11 is connected with the inlet of the flue of the waste heat boiler 14, the water supply inlet of the waste heat boiler 14 is connected with the water supply pipe 15, the superheated steam outlet of the waste heat boiler 14 is connected with the steam inlet of the steam turbine 17, the exhaust steam outlet 16 of the steam turbine 17 is connected to a condensing system, and the rigid shaft of the steam turbine 17 is connected with the steam turbine generator 18.
The air separation unit 3 is an independent air compressor driven by electric power.
The gas turbine 7 is a low-heating value gas turbine suitable for combusting synthetic gas, and needs to be started by using light diesel 8 and the load is increased to 55-70% of rated load so as to switch to the synthetic gas fuel.
The exhaust-heat boiler 14 is an exhaust-heat boiler with an afterburning type, and an external afterburning device is adopted.
The afterburner 10 and the afterburner 11 form an afterburner of the waste heat boiler 14, the afterburner adopts the synthetic gas generated by the coal gasification unit 2 as the afterburner fuel, the afterburner is only used in the starting process of the IGCC power station, and the afterburner is withdrawn from operation after the normal and stable operation of the IGCC power station.
The waste heat boiler 14 is started by utilizing the post combustion of the synthetic gas after the coal gasification unit 2 is started, and the waste heat boiler 14 generates steam to drive the steam turbine 17 to start and drive the steam turbine generator 18 to generate power.
The power consumption of the air separation unit 3 is purchased by a power grid at the beginning of starting, and the power consumption of the air separation unit 3 is switched to the power consumption of the plant after the steam turbine generator generates power.
The starting method of the energy-saving starting system of the IGCC power station comprises the following steps: firstly, taking electricity from a power grid to start an air separation unit 3, driving an air compressor 4 of the air separation unit 3 by using the electric power of the power grid, and after the air separation unit 3 stably produces oxygen, providing oxygen for a coal gasification unit 2 to start the coal gasification unit 2; the coal gasification unit 2 utilizes the coal dust 1 and the oxygen sent by the air separation unit 3 to generate synthesis gas, the synthesis gas output is unstable in the initial stage of starting the coal gasification unit 2, and the synthesis gas is sent to the flare stack 20 for emptying combustion treatment; after the coal gasification unit 2 runs stably, the synthetic gas is sent to the afterburner 11, and meanwhile, the afterburner 10 is started, the afterburner sucks third air 9 and provides combustion air for the afterburner 11, the synthetic gas is combusted in the combustor 11 to generate high-temperature flue gas, and meanwhile, a water supply pipe 15 continuously supplies water to the waste heat boiler 14; the waste heat boiler 14 heats water by using high-temperature flue gas from the afterburner 11 to generate steam which is sent to the steam turbine 17; the steam turbine 17 uses the steam generated by the waste heat boiler 14 to perform flushing and drive the steam turbine generator 18 to generate power and grid connection, and warms up with initial load; after the warm-up is finished, according to the yield of the synthesis gas, the loads of the afterburner fan 10, the afterburner 11 and the waste heat boiler 14 are gradually increased, the steam yield is increased, so that the load of the steam turbine 17 is gradually increased, and the power generation load of the steam turbine generator 18 is synchronously increased; the power supply of the air separation unit 3 is switched from power taking from a power grid to station service power; starting the gas turbine 7, wherein the gas turbine 7 starts a gas turbine generator 13 in a flushing stage to serve as a motor, the gas turbine 7 is driven by station service electricity to rotate by an air compressor, the gas turbine 7 sucks second air 6, the second air is fed into a combustion chamber, light diesel 8 is fed into the combustion chamber, high-temperature and high-pressure flue gas generated in the combustion chamber after the gas turbine 7 ignites is expanded and works through a turbine chamber of the gas turbine 7 and then serves as first flue gas 12 of the gas turbine 7 to be fed into a flue of a waste heat boiler 14; after the ignition of the gas turbine 7 is successful, the revolution of the gas turbine 7 is regulated to be stable to 3000r/min by regulating the supply amount of the light diesel 8, then the gas turbine generator 13 is converted into a generator to be used for generating power and grid connection, and then the load of the gas turbine 7 is gradually increased to a load capable of performing fuel switching by increasing the supply amount of the light diesel 8; in the process of gradually increasing the load of the gas turbine 7, the flow rate of the first exhaust gas 12 sent to the waste heat boiler 14 by the gas turbine 7 is gradually increased, and at the moment, the load of the afterburner 11 is gradually reduced, so that the loads of the waste heat boiler 14 and the steam turbine 17 are kept stable, and the excess synthesis gas produced by the coal gasification unit 2 is exhausted and combusted through the flare stack 20; after the load of the gas turbine 7 is increased to a load capable of performing fuel switching, performing fuel switching operation of the gas turbine 7, switching the fuel of the gas turbine 7 from light diesel 8 to synthesis gas, and gradually turning off the synthesis gas sent to the afterburner 11 and the flare stack 20 until the synthesis gas is completely turned off; the afterburner 10 is stopped, the afterburner 11 is withdrawn from operation, and the waste heat boiler 14 is completely driven by the first exhaust gas 12 of the gas turbine, and the IGCC power station is started up completely.
The beneficial effects of the invention are as follows:
because the synthetic gas generated by the coal gasification unit 2 is firstly utilized to carry out the afterburning of the waste heat boiler 14 to start the steam turbine 17 to generate electricity, and then the gas turbine 7 is started, compared with the traditional process of firstly starting the gas turbine 7 and then starting the waste heat boiler 14 and the steam turbine 7 to generate electricity, the method has the characteristics of shortening the whole starting time, saving the electricity purchasing quantity of a power plant, reducing the light diesel oil consumption and reducing the discharge quantity of a synthetic gas torch, and has remarkable energy-saving effect, greatly saving the starting cost of an IGCC power station and improving the economic benefit of the power plant. Taking an IGCC power station with 300MW capacity as an example, the starting time can be shortened by 3 hours as a whole every time of cold start of the whole plant, the emptying of a synthetic gas flare tower is reduced by about 40 ten thousand Nm < 3 >, the consumption of light diesel oil by a gas turbine is reduced by about 30t, and the starting cost is saved by about 53 ten thousand yuan.
Drawings
Fig. 1 is a schematic structural view of an embodiment of the present invention.
FIG. 2 is a start-up flow chart of an embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings, using an IGCC plant with a total power generation capacity of 260MW as an example, and the main configurations and plant parameters of the IGCC plant are shown in table 1.
TABLE 1 IGCC plant Main plant configuration
Referring to fig. 1, an energy-saving starting system of an IGCC power station comprises a coal gasification unit 2, wherein a coal dust inlet of the coal gasification unit 2 is connected with coal dust 1, an oxygen inlet of the coal gasification unit 2 is connected with an oxygen outlet of an air separation unit 3, a first air 5 is sucked into an air compressor 4 inlet of the air separation unit 3, a synthetic gas outlet of the coal gasification unit 2 is divided into three paths, the first path is connected with a flare stack 20, the second path is connected with an afterburner 11, and the third path is connected with a combustion chamber of a gas turbine 7; the air compressor inlet of the gas turbine 7 sucks in second air 6, the combustion chamber inlet of the gas turbine 7 inputs light diesel 8, the rigid shaft of the gas turbine 7 is connected with a gas turbine generator 13, the gas turbine 7 drives the gas turbine generator 13 to generate power, the first exhaust gas 12 of the gas turbine 7 is communicated with the flue inlet of the waste heat boiler 14, and the second exhaust gas 19 of the waste heat boiler 14 is discharged into the atmosphere;
the air inlet of the afterburner 11 is connected with the outlet of the afterburner 10, the inlet of the afterburner 10 sucks third air 9, the outlet of the afterburner 11 is connected with the inlet of the flue of the waste heat boiler 14, the water supply inlet of the waste heat boiler 14 is connected with the water supply pipe 15, the superheated steam outlet of the waste heat boiler 14 is connected with the steam inlet of the steam turbine 17, the exhaust steam outlet 16 of the steam turbine 17 is connected to a condensing system, the rigid shaft of the steam turbine 17 is connected with the steam turbine generator 18, and the steam turbine 17 drives the steam turbine generator 18 to generate electricity.
The air separation unit 3 is an independent air compressor driven by electric power.
The gas turbine 7 is a low-heating value gas turbine suitable for combusting synthetic gas, and needs to be started by using light diesel 8 and the load is increased to 55-70% of rated load so as to switch to the synthetic gas fuel.
The exhaust-heat boiler 14 is an exhaust-heat boiler with an afterburning type, and an external afterburning device is adopted.
The afterburner 10 and the afterburner 11 form an afterburner of the waste heat boiler 14, the afterburner adopts the synthetic gas generated by the coal gasification unit 2 as the afterburner fuel, and the afterburner is only used in the starting process of the IGCC power station so as to improve the starting speed of the waste heat boiler and the turbine system, and the afterburner is withdrawn from operation after the normal and stable operation of the IGCC.
The waste heat boiler 14 is started by utilizing the post combustion of the synthetic gas immediately after the coal gasification unit 2 is started, and the waste heat boiler 14 generates steam to drive the steam turbine 17 to start and drive the steam turbine generator 18 to generate power without waiting for the preferential starting of the gas turbine 7.
The power consumption of the air separation unit 3 is purchased by a power grid at the beginning of starting, and the power consumption of the air separation unit 3 is switched to the power consumption of the plant after the steam turbine generator generates power.
The starting method of the energy-saving starting system of the IGCC power station comprises the following steps: firstly, taking electricity from a power grid to start an air separation unit 3, driving main power consumption equipment such as an air compressor 4 of the air separation unit 3 by using the electric power of the power grid, and after the air separation unit 3 stabilizes oxygen production, providing oxygen for a coal gasification unit 2 to start the coal gasification unit 2; the coal gasification unit 2 utilizes the coal dust 1 and the oxygen sent by the air separation unit 2 to generate synthetic gas, the synthetic gas output is unstable in the initial stage of starting the coal gasification unit 2, and the synthetic gas is sent to the flare stack 20 for emptying combustion treatment; after the coal gasification unit 2 runs stably, the synthetic gas is sent to the afterburner 11, and meanwhile, the afterburner 10 is started and started, the afterburner sucks third air 9 and provides combustion air for the afterburner 11, the synthetic gas is combusted in the combustor 11 to generate high-temperature flue gas to be sent to the waste heat boiler 14, and meanwhile, a water supply pipe 15 continuously supplies water with certain pressure to the waste heat boiler 14; the waste heat boiler 14 heats water by using high-temperature flue gas from the afterburner 11 to generate steam which is sent to the steam turbine 17; the steam turbine 17 uses the steam generated by the waste heat boiler 14 to perform flushing and drive the steam turbine generator 18 to generate power and grid connection, and the steam turbine is warmed up with an initial load of 10MW; after the warm-up is finished, according to the yield of the synthesis gas, the loads of the afterburner fan 10, the afterburner 11 and the waste heat boiler 14 are gradually increased, the steam yield is increased, so that the load of the steam turbine 17 is gradually increased, and the power generation load of the steam turbine generator 18 is synchronously increased; in this embodiment, since the gasification furnace in the coal gasification unit 2 can also generate about 150t/h of medium pressure saturated steam, the steam is excessively discharged except for auxiliary steam for a plant before the steam turbine 17 is started, after the steam turbine 17 is started and the power generation load reaches about 50MW, the steam can be sent to the medium pressure steam system of the waste heat boiler 14 for overheating according to the load condition, and then sent to the steam turbine 17 for power generation; after the steam turbine 17 drives the steam turbine generator 18 to generate electricity, the power supply of the air separation unit 3 is switched from power taking from a power grid to station service; starting the gas turbine 7, wherein the gas turbine 7 starts a gas turbine generator 13 in a flushing stage to serve as a motor, the gas turbine 7 is driven by station service electricity to rotate by an air compressor, the gas turbine 7 sucks second air 6, the second air is fed into a combustion chamber, light diesel 8 is fed into the combustion chamber, high-temperature and high-pressure flue gas generated in the combustion chamber after the gas turbine 7 ignites is expanded and works through a turbine chamber of the gas turbine 7 and then serves as first flue gas 12 of the gas turbine 7 to be fed into a flue of a waste heat boiler 14; after the ignition of the gas turbine 7 is successful, the revolution of the gas turbine 7 is regulated to be stable to 3000r/min by regulating the supply amount of the light diesel 8, then the gas turbine generator 13 is converted into a generator to be used for generating power and grid connection, and then the load of the gas turbine is gradually increased to 110MW by increasing the supply amount of the light diesel 8; in the process of gradually increasing the load of the gas turbine 7, the flow rate of the first exhaust gas 12 sent to the waste heat boiler 14 by the gas turbine 7 is gradually increased, and at the moment, the load of the afterburner 11 is gradually reduced, so that the loads of the waste heat boiler 14 and the steam turbine 17 are kept stable, and the excess synthesis gas produced by the coal gasification unit 2 is exhausted and combusted through the flare stack 20; after the load of the gas turbine 7 is increased to 110MW, performing fuel switching operation of the gas turbine 7, switching the fuel of the gas turbine 7 from light diesel 8 to synthesis gas, and gradually turning off the synthesis gas sent to the afterburner 11 and the flare tower 20 until the synthesis gas is completely turned off; stopping the afterburner fan 10, and enabling the afterburner 11 to be out of operation, wherein the waste heat boiler 14 is completely driven by the first smoke exhaust 12 of the gas turbine; the power generation load is adjusted according to the load demand of the power grid, and the air separation unit 3, the coal gasification unit 2, the gas turbine 7, the steam turbine 17 and the like are coordinated and matched, so that the IGCC power station completes the starting of the whole plant. The starting sequence and the required time of each unit are shown in fig. 2, and table 2 shows the cost comparison between the cold start of the IGCC power station by adopting the method of the invention and the current general method, so that the method of the invention can reduce the starting time, save the energy consumption and reduce the starting cost.
TABLE 2 comparison of costs for IGCC plant Cold starts with the present general method using the method of the present invention
Claims (7)
1. A starting method of an energy-saving starting system of an IGCC power station is characterized by comprising the following steps: the energy-saving starting system of the IGCC power station comprises a coal gasification unit (2), wherein a coal dust inlet of the coal gasification unit (2) is connected with coal dust (1), an oxygen inlet of the coal gasification unit (2) is connected with an oxygen outlet of an air separation unit (3), a first air (5) is sucked into an air compressor (4) inlet of the air separation unit (3), a synthesis gas outlet of the coal gasification unit (2) is divided into three paths, the first path is connected with a flare tower (20), the second path is connected with an afterburner (11), and the third path is connected with a combustion chamber of a gas turbine (7); the air compressor inlet of the gas turbine (7) sucks in second air (6), the combustion chamber inlet of the gas turbine (7) inputs light diesel (8), the rigid shaft of the gas turbine (7) is connected with a gas turbine generator (13), the first smoke exhaust (12) of the gas turbine (7) is communicated with the flue inlet of the waste heat boiler (14), and the second smoke exhaust (19) of the waste heat boiler (14) is discharged into the atmosphere;
the air inlet of the afterburner (11) is connected with the outlet of the afterburner fan (10), the inlet of the afterburner fan (10) sucks third air (9), the outlet of the afterburner fan (11) is connected with the flue inlet of the waste heat boiler (14), the water supply inlet of the waste heat boiler (14) is connected with the water supply pipe (15), the superheated steam outlet of the waste heat boiler (14) is connected with the steam inlet of the steam turbine (17), the exhaust steam outlet (16) of the steam turbine (17) is connected to a condensing system, and the rigid shaft of the steam turbine (17) is connected with the steam turbine generator (18);
according to the starting method of the energy-saving starting system of the IGCC power station, firstly, an electric power is taken from a power grid to start an air separation unit (3), an air compressor (4) of the air separation unit (3) is driven by electric power of the power grid, and after the air separation unit (3) stably produces oxygen, oxygen is provided for a coal gasification unit (2) to start the coal gasification unit (2); the coal gasification unit (2) utilizes the coal dust (1) and the oxygen sent by the air separation unit (3) to generate synthesis gas, the synthesis gas output is unstable in the initial stage of starting the coal gasification unit (2), and the synthesis gas is sent to the flare stack (20) for emptying combustion treatment; after the coal gasification unit (2) operates stably, the synthetic gas is sent to the afterburner (11), meanwhile, the afterburner fan (10) is started, the afterburner fan sucks third air (9) and provides combustion air for the afterburner (11), the synthetic gas is combusted in the afterburner (11) to generate high-temperature flue gas to be sent to the waste heat boiler (14), and meanwhile, the water supply pipe (15) continuously supplies water to the waste heat boiler (14); the waste heat boiler (14) heats water by using high-temperature flue gas from the afterburner (11) to generate steam which is sent to the steam turbine (17); the steam turbine (17) utilizes steam generated by the waste heat boiler (14) to perform flushing and drive the steam turbine generator (18) to generate power and grid connection, and the steam turbine generator is warmed up with initial load; after the warm-up is finished, according to the yield of the synthesis gas, the loads of the afterburner (10), the afterburner (11) and the waste heat boiler (14) are gradually increased, the steam yield is increased, so that the load of the steam turbine (17) is gradually increased, and the power generation load of the steam turbine generator (18) is synchronously increased; the power supply of the air separation unit (3) is switched from power taking from a power grid to station service power; starting a gas turbine (7), wherein a gas turbine generator (13) is used as a motor in a flushing stage of the gas turbine (7), the gas turbine (7) is driven by station power to rotate by an air compressor of the gas turbine (7), second air (6) is sucked into an air compressor of the gas turbine (7) and is sent into a combustion chamber, light diesel (8) is input to the combustion chamber, and high-temperature and high-pressure flue gas generated by the combustion chamber after the gas turbine (7) is ignited is taken as a first flue gas (12) of the gas turbine (7) to be sent to a flue of a waste heat boiler (14) after expansion work of a turbine chamber of the gas turbine (7); after the ignition of the gas turbine (7) is successful, regulating the rotation number of the gas turbine (7) to be 3000r/min by regulating the supply quantity of the light diesel (8), then converting the gas turbine generator (13) into a generator for generating electricity and connecting the power grid, and gradually lifting the load of the gas turbine (7) to the load capable of carrying out fuel switching by lifting the supply quantity of the light diesel (8); in the process of gradually increasing the load of the gas turbine (7), the flow of the first exhaust gas (12) sent to the waste heat boiler (14) by the gas turbine (7) is gradually increased, and the load of the afterburner (11) is gradually reduced at the moment, so that the loads of the waste heat boiler (14) and the steam turbine (17) are kept stable, and the excess synthesis gas produced by the coal gasification unit (2) is discharged and combusted through the flare tower (20); after the load of the gas turbine (7) is increased to the load capable of performing fuel switching, performing fuel switching operation of the gas turbine (7), switching the fuel of the gas turbine (7) from light diesel (8) to synthesis gas, and gradually turning off the synthesis gas sent to the afterburner (11) and the flare tower (20) until the synthesis gas is completely turned off; the afterburner fan (10) is stopped, the afterburner (11) is stopped, the waste heat boiler (14) is completely driven by the first smoke exhaust (12) of the gas turbine, and the IGCC power station is started in the whole plant.
2. The starting method of an energy-saving starting system of an IGCC power plant according to claim 1, wherein: the air separation unit (3) is an independent air compressor driven by electric power.
3. The starting method of an energy-saving starting system of an IGCC power plant according to claim 1, wherein: the gas turbine (7) is a low-heating value gas turbine suitable for burning synthetic gas, and needs to be started by using light diesel (8) and is increased to 55-70% of rated load to be switched to the synthetic gas fuel.
4. The starting method of an energy-saving starting system of an IGCC power plant according to claim 1, wherein: the waste heat boiler (14) is a waste heat boiler with an afterburning type, and an external afterburning device is adopted.
5. The starting method of an energy-saving starting system of an IGCC power plant according to claim 1, wherein: the afterburner (10) and the afterburner (11) form an afterburner of the waste heat boiler (14), the afterburner adopts the synthetic gas produced by the coal gasification unit (2) as the afterburner fuel, the afterburner is only used in the starting process of the IGCC power station, and the afterburner is withdrawn from operation after the normal and stable operation of the IGCC power station.
6. The starting method of an energy-saving starting system of an IGCC power plant according to claim 1, wherein: the waste heat boiler (14) is started by utilizing the post combustion of the synthetic gas after the coal gasification unit (2) is started, and the waste heat boiler (14) generates steam to drive the steam turbine (17) to start and drive the steam turbine generator (18) to generate power.
7. The starting method of an energy-saving starting system of an IGCC power plant according to claim 1, wherein: the power consumption of the air separation unit (3) is purchased by a power grid at the beginning of starting, and the power consumption of the air separation unit (3) is switched to the power consumption of the factory after the steam turbine generator (18) generates power.
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| CN108954374B (en) * | 2018-08-16 | 2023-05-30 | 哈尔滨锅炉厂有限责任公司 | After-combustion air system of combined cycle waste heat boiler |
| CN109412183A (en) * | 2018-11-22 | 2019-03-01 | 西安热工研究院有限公司 | A kind of integrated power generation system and method for combining oxygen-enriched combusting and liquid oxygen energy storage |
| CN114251138B (en) * | 2020-09-23 | 2024-03-19 | 上海电气电站设备有限公司 | Steam supplementing type starting method of steam turbine unit |
| CN112855302B (en) * | 2021-01-29 | 2022-06-14 | 中国华能集团清洁能源技术研究院有限公司 | IGCC power station coupling air liquefaction equipment system and working method thereof |
| CN112994118B (en) * | 2021-02-05 | 2022-11-15 | 中国华能集团清洁能源技术研究院有限公司 | Gasification furnace hydrogenation system of IGCC power station and working method thereof |
| CN112983584B (en) * | 2021-02-07 | 2022-10-28 | 华能（天津）煤气化发电有限公司 | Integrated Integrated Gasification Combined Cycle (IGCC) power station start-stop method |
| CN114060114A (en) * | 2021-11-23 | 2022-02-18 | 中国华能集团清洁能源技术研究院有限公司 | IGCC power station one-key start-stop control method |
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