CN107781803B - Coal gas peak regulating power station - Google Patents
Coal gas peak regulating power station Download PDFInfo
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- CN107781803B CN107781803B CN201610827965.7A CN201610827965A CN107781803B CN 107781803 B CN107781803 B CN 107781803B CN 201610827965 A CN201610827965 A CN 201610827965A CN 107781803 B CN107781803 B CN 107781803B
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- gas
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- gas turbine
- air
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- 239000003034 coal gas Substances 0.000 title claims abstract description 52
- 230000001105 regulatory effect Effects 0.000 title abstract description 9
- 239000007789 gas Substances 0.000 claims abstract description 305
- 239000003245 coal Substances 0.000 claims abstract description 79
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims abstract description 60
- 239000002956 ash Substances 0.000 claims abstract description 49
- 239000000446 fuel Substances 0.000 claims abstract description 40
- 238000002485 combustion reaction Methods 0.000 claims abstract description 35
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 35
- 230000023556 desulfurization Effects 0.000 claims abstract description 35
- 239000003546 flue gas Substances 0.000 claims abstract description 33
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000010883 coal ash Substances 0.000 claims abstract description 26
- 238000005422 blasting Methods 0.000 claims abstract description 11
- 239000002893 slag Substances 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 40
- 238000002156 mixing Methods 0.000 claims description 28
- 239000003818 cinder Substances 0.000 claims description 22
- 238000010248 power generation Methods 0.000 claims description 17
- 238000002309 gasification Methods 0.000 claims description 12
- 239000002918 waste heat Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 8
- 238000000926 separation method Methods 0.000 claims description 8
- 238000010304 firing Methods 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 3
- -1 steam Substances 0.000 claims description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 14
- 230000005611 electricity Effects 0.000 abstract description 7
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 7
- 230000003009 desulfurizing effect Effects 0.000 abstract description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 16
- 229910052799 carbon Inorganic materials 0.000 description 16
- 238000006243 chemical reaction Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 238000000746 purification Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000007664 blowing Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 150000003568 thioethers Chemical class 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C1/00—Combustion apparatus specially adapted for combustion of two or more kinds of fuel simultaneously or alternately, at least one kind of fuel being either a fluid fuel or a solid fuel suspended in a carrier gas or air
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/72—Other features
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
- F01B23/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01B23/10—Adaptations for driving, or combinations with, electric generators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B33/00—Steam-generation plants, e.g. comprising steam boilers of different types in mutual association
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C1/00—Combustion apparatus specially adapted for combustion of two or more kinds of fuel simultaneously or alternately, at least one kind of fuel being either a fluid fuel or a solid fuel suspended in a carrier gas or air
- F23C1/12—Combustion apparatus specially adapted for combustion of two or more kinds of fuel simultaneously or alternately, at least one kind of fuel being either a fluid fuel or a solid fuel suspended in a carrier gas or air gaseous and pulverulent fuel
-
- 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
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J3/00—Removing solid residues from passages or chambers beyond the fire, e.g. from flues by soot blowers
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
- C10J2300/0913—Carbonaceous raw material
- C10J2300/093—Coal
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/16—Integration of gasification processes with another plant or parts within the plant
- C10J2300/1671—Integration of gasification processes with another plant or parts within the plant with the production of electricity
- C10J2300/1675—Integration of gasification processes with another plant or parts within the plant with the production of electricity making use of a steam turbine
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/16—Integration of gasification processes with another plant or parts within the plant
- C10J2300/1687—Integration of gasification processes with another plant or parts within the plant with steam generation
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention relates to a coal gas peak regulating power station, which comprises coal gas equipment, a gas turbine or a gas turbine and a steam turbine of air blasting, and a boiler consisting of an air preheater, an economizer, a superheater, a steam drum and an evaporator, an exhaust ash removing device, a desulfurizing device and a nitrogen oxide removing device. The fuel pipeline of the air-blast coal-to-gas equipment is connected with a gas turbine or a gas engine, and is connected with the coal-fired boiler in parallel, and residual coal slag and coal ash gasified by the air-blast coal-to-gas equipment are mixed into the coal-fired boiler for combustion. The gas turbine or the gas turbine generates electricity by using the gas under high load, and stops or reduces the gas consumption under low load, and the residual gas is conveyed to the boiler to be mixed with the coal for combustion, so that the load of the coal-fired boiler is further reduced, and the peak regulation amplitude of the unit is wider. The coal-fired boiler generates steam, and the flue gas enters an ash removal device for ash removal, a desulfurization device for desulfurization and a nitrogen removal device for denitrification after exiting the boiler.
Description
Technical Field
The invention relates to the field of power generation, in particular to a coal gas peak shaving power station, which is a deep peak shaving power generation system taking coal as initial fuel by combining a coal gasification gas turbine or a gas turbine power station with a conventional coal-fired power station.
Background
Because the load in the power grid fluctuates, the load is usually low at daytime and at night, and especially for the power grid with higher renewable energy power generation proportion, for example, more wind generating sets are connected in a grid, the difference between the load peaks and the load valleys can be larger under the influence of natural environment, so that the peak shaving amplitude requirement on the thermal power generating sets in the grid is higher. The most basic power generation equipment in our country is a coal-fired steam power plant, the conventional coal-fired steam power plant mainly comprises a boiler and a steam turbine, and after the boiler flue, a perfect purification device for ash removal, desulfurization, denitration and the like is arranged, the fuel price is low, the operation cost is low, but the peak regulation capability is limited, the general pure coal can only be maintained at more than 50% of load, if the operation under lower load is required, the combustion stability of the boiler is maintained by using liquid fuel or natural gas for supporting combustion and mixed combustion, and the peak regulation range of a unit is limited because the two latter fuels have higher cost and the power plant is avoided as much as possible. The gas turbine or the gas turbine is quick in starting and loading, is suitable for peak shaving operation, but can only burn gas fuel or liquid fuel, and the fuel price limits the application of the gas turbine or the gas turbine. If coal gasification is carried out and then the coal gasification is supplied to a gas turbine or a gas turbine for combustion power generation, the power generation cost is greatly reduced.
Disclosure of Invention
The utility model provides a coal gas peak regulation power station, its includes the coal gas equipment, gas turbine or gas turbine, the steam turbine of air blast, and the boiler that comprises air preheater, economizer, superheater, steam drum, evaporimeter, exhaust ash removal device, desulfurization device and nitrogen oxide removal device. The fuel pipeline of the air-blast coal-to-gas equipment is connected with a gas turbine or a gas turbine, and is connected with a coal-fired boiler in parallel, and a conveying line is arranged to convey gasified residual cinder coal ash from the air-blast coal-to-gas equipment to a blending site of boiler coal. The boiler evaporator produces wet steam, a pipeline is connected into a steam drum for steam-water separation, and the steam drum water returns to the evaporator through a down pipe for continuous steam production; the steam is connected with a superheater from the upper part of a steam drum through a pipeline, and the superheated steam is connected with a steam turbine from an outlet of the superheater to perform work and power generation; the inlet of the economizer is connected with a boiler water supply pipeline, and the heated water supply is connected with a steam drum from the outlet; the inlet of the air preheater is connected with a blower to preheat the air supply, then the air supply is fed into a hearth to be burnt with pulverized coal to generate hot flue gas, steam, water supply and preheated air are heated in a boiler flue, and then the air is discharged from the boiler to enter an ash removal device for ash removal, enter a desulfurization device for desulfurization and enter a nitrogen oxide removal device for denitrification. The method is characterized in that: the fuel pipeline of the air-blast coal-to-gas equipment is connected with a gas turbine or a gas turbine, and is connected with a coal-fired boiler in parallel, and a conveying line is arranged to convey gasified residual cinder coal ash from the air-blast coal-to-gas equipment to a blending site of boiler coal, and the coal-to-gas equipment and the blending site are conveyed to the boiler for combustion together after blending.
The exhaust gas of the gas turbine or the gas turbine is connected into a boiler flue gas channel through an exhaust pipeline, and then is connected into an ash removing device, a desulfurizing device and a nitrogen oxide removing device through a boiler flue. The exhaust waste heat energy is recovered in the boiler, and sulfide and nitrogen oxides in the flue gas are removed. The gas turbine or the gas fuel pipeline for the gas turbine is connected with a coal gas equipment fuel pipeline for air blasting.
The gas turbine or the gas fuel pipeline for the gas turbine is connected with a plurality of air blast coal gas equipment fuel pipelines.
The air blast coal gas equipment is connected with a plurality of gas turbines or gas turbines.
The gas turbine or the gas turbine is one, and an exhaust pipeline of the gas turbine or the gas turbine is connected with a coal-fired boiler.
The gas turbine or the gas turbine is provided with a plurality of gas turbines, and the exhaust pipeline of the gas turbines is connected with a coal-fired boiler.
The gas turbine or the gas turbine exhaust pipe is connected with the boiler, and a bypass chimney with a baffle door capable of adjusting the flow of the flue gas entering the boiler is arranged between the outlet of the exhaust pipe and the boiler. So as to avoid the impact of exhaust gas on the boiler when the gas turbine or the gas turbine is started quickly.
The gas turbine or the gas turbine is connected with a waste heat boiler at an exhaust outlet and then is connected with a desulfurization device or a nitrogen oxide removal device after a flue of the coal-fired boiler. Thus the same purifying device can be shared, and the repeated investment is avoided.
The air blast coal gas making equipment is normal pressure air blast gas making equipment, the gas pressure is close to the gas inlet pressure of the gas engine and the gas inlet pressure of the boiler, and the mutual switching of gas fuel between the gas engine and the boiler is facilitated. Or using a gas turbine and pressurizing with a gas compressor on its gas fuel line, the gas switching between the compressor upstream and the boiler.
The air blast coal gas making equipment is pressurized air blast gas making equipment, the gas pressure is matched with a gas turbine, the gas pressure is matched with the gas turbine, but the gas pressure is reduced by a pressure reducing device before the gas pipe is connected to a boiler. Or the gas is respectively connected with a gas engine and a boiler after depressurization.
The ash back burning method of the coal gas peak regulation power station is characterized by comprising the following steps of: delivering the gasified residual cinder coal ash from the air-blown coal gas equipment to a blending site of boiler coal, and blending the boiler coal to burn together, wherein the blending can be divided into the following steps:
1) Blending gasified residual cinder coal ash conveyed from air-blown coal-to-gas equipment with coal;
2) The proportion of the ash slag doped firing is within the range of 0.1-40% of the weight of rated load fire coal of the boiler;
3) And (5) feeding the mixture into a coal-fired boiler for combustion.
The proportion of the ash slag is 17% or 6% of the rated load coal weight of the boiler.
Advantageous effects
The invention combines coal gasification power generation with a coal-fired power generation system, and the peak-to-peak range of a unit is enlarged by alternately supplying coal gas to a gas turbine and a coal-fired boiler or the gas turbine and the coal-fired boiler in peak-to-valley periods, thereby realizing the purpose of enlarging the peak-to-peak capacity of a coal-fired power station by using low-price fuel.
Drawings
FIG. 1 is a schematic diagram showing the invention, in which a fuel pipeline of an air-blown coal-to-gas plant for air blowing is connected with a gas turbine or a gas turbine, and the fuel pipeline is also connected with a coal-fired boiler in parallel, and a conveying line is arranged to convey gasified residual coal slag and coal ash from the air-blown coal-to-gas plant to a boiler coal-fired blending site.
FIG. 2 is a schematic diagram of the present invention showing the gas turbine or the gas turbine exhaust gas being passed through the exhaust duct to the boiler, then being passed out of the boiler flue to the ash removal unit, to the desulfurization unit, and to the nitrogen oxide removal unit.
FIG. 3 is a schematic diagram of a gas turbine or gas turbine connected to a plurality of air-blown coal gas plants.
FIG. 4 is a schematic diagram of the present invention showing a plurality of gas turbines or gas engines connected to a single air blast coal-making plant, with the exhaust pipes of the plurality of gas turbines or gas engines connected to a single coal-fired boiler.
FIG. 5 is a schematic diagram of a system in which a gas turbine or gas turbine exhaust pipe is connected to a coal-fired boiler, and a bypass chimney with a baffle door is installed between the exhaust pipe and the boiler to adjust the flow of exhaust gas into the boiler.
FIG. 6 shows a schematic view of a desulfurization or NOx removal unit from a gas turbine or gas turbine exhaust gas to a waste heat boiler and then to a coal-fired boiler.
Detailed Description
The application will be further illustrated with reference to specific examples. It should be understood that these examples are illustrative of the present application and are not intended to limit the scope of the present application. Furthermore, it should be understood that various changes and modifications can be made by one skilled in the art after reading the teachings of the present application, and such equivalents are intended to fall within the scope of the application as defined in the appended claims.
As shown in fig. 1, the air blast coal gas plant 14 is connected with a gas turbine or a gas engine 7 in a pipeline, and is connected with a coal-fired boiler in parallel, and a conveying line is arranged to convey gasified residual coal slag and coal ash from the air blast coal gas plant 14 to a blending site 15 of boiler coal:
A gas peak regulating power station comprises a gas making device 14 for air blasting, a gas turbine or a gas turbine 7, a steam turbine 1, a boiler consisting of an air preheater 2, an economizer 3, a superheater 4, a steam drum 5 and an evaporator 6, an exhaust gas ash removing device 9, a desulfurization device 10 and a nitrogen oxide removal device 11. The fuel pipeline of the air-blast coal gas equipment 14 is connected with a gas turbine or a gas engine through a valve 8, and is connected with a pipeline in parallel to the coal-fired boiler through a valve 11, and a conveying line is arranged to convey gasified residual cinder coal ash from the air-blast coal gas equipment 14 to a blending site 15 of boiler coal, and then the gasified residual cinder coal ash is blended into the coal to be sent to the boiler for combustion, so that the carbon conversion difficulty of the gasifier is reduced, and the burnout rate of final carbon is ensured. When the power station is under high load, the gas turbine or the gas turbine 7 generates power by using coal gas, and the coal-fired boiler only burns the coal to generate power; the gas turbine or the gas turbine 7 is stopped or the gas consumption is reduced to stop at low load, and the residual gas is conveyed to the boiler to be mixed with the coal for combustion, so that the load of the boiler is further reduced compared with the load of the pure coal for combustion, and the peak regulation range of the coal-fired power generation equipment is enlarged. The boiler evaporator 6 produces wet steam, the steam drum 5 is connected with a pipeline for steam-water separation, and the steam drum water returns to the evaporator 6 through a down pipe for continuous steam production; the steam is connected with a superheater 4 through a pipeline from the upper part of a steam drum 5 to generate superheated steam, and the superheated steam is connected with a steam turbine 1 from an outlet of the superheater 4 to perform power generation; the inlet of the economizer 3 is connected with a boiler water supply pipeline, and the heated water supply is connected with a steam drum 5 from the outlet; the inlet of the air preheater 2 is connected with a blower to preheat the air supply, then the air supply is sent into a hearth to be burnt with pulverized coal to generate hot flue gas, the steam, the water supply and the preheated air are heated in a boiler flue, and then the air is sent out of the boiler to enter the ash removal device 9 for ash removal, enter the desulfurization device 10 for desulfurization and enter the nitrogen removal device 13 for denitrification.
Based on the device, the coal gas equipment 14 for blowing normal pressure air is adopted, so that the gas outlet pressure is close to the gas inlet pressure of the gas engine 7 and the boiler, and the mutual switching of gas and fuel between the gas engine 7 and the boiler is facilitated. Or using a gas turbine 7 and pressurizing it on its gas fuel line with a high pressure gas compressor, the gas being switched between the compressor upstream and the boiler.
On the basis of the device, a pressurized air blast gas making device 14 is adopted, the pressure of the gas is matched with that of the gas turbine 7, but the pressure of the gas pipe is reduced by a pressure reducing device before the gas pipe is connected to a boiler. Or the gas is respectively connected with the gas engine 7 and the boiler after depressurization.
As shown in fig. 1, the ash back-burning method of the coal gas peak regulation power station is characterized in that the residual coal ash is mixed with the coal-fired boiler for burning by gasifying the coal gas equipment with air blasting, and the mixing burning can be divided into the following sub-items:
1) Blending gasified residual cinder coal ash conveyed from air-blown coal-to-gas equipment with coal;
2) The proportion of the ash slag doped firing is within the range of 0.1-40% of the weight of rated load fire coal of the boiler;
3) And (5) feeding the mixture into a coal-fired boiler for combustion.
The residual ash is burnt out, the blended coal is required to be fed into a boiler for combustion, the stable combustion of the coal-fired boiler is usually maintained below 50% load, a certain amount of liquid fuel or gas fuel is required to be mixed-burned, for example, the boiler of a 300MW coal-fired power plant needs more than 40Gcal/h heat, if the gas fuel is gasified by coal, even if 10% of low ash coal is selected for gasification, even if 99% of carbon conversion rate is achieved, 0.5% of ash from the coal for the boiler is blended into the coal, and therefore, the blending ratio of 0.1% of ash to the coal is taken as the lower limit. The heat consumption of a gas turbine or a gas machine for peak regulation is far more than 40Gcal/h, different operating points of air blast coal-making equipment can have different methods, the operating range of a fluidized bed gasifier can reach 30-100%, 30% gasification load operating points are used for maintaining low-load operation of a boiler, 100% gasification load operating points are used for driving the gas turbine or the gas machine, 5000kcal/kg of power coal is adopted for gasification, 30% of coal containing ash cannot be converted into 10% of sensible heat of coal, and under the condition of 50% of carbon conversion rate, the blending ratio of blending ash to the 31% of the boiler coal is the upper limit of the ash-slag quantity ratio of the coal to the rated load quantity; the carbon conversion rate of the working point is 70%, other parameters are the same as before, and the proportion of the ash slag doped firing is 17% of the rated load coal weight of the boiler; the carbon conversion rate is 70%, the gasification furnace capacity is reduced to ensure that the 40Gcal/h heat required by maintaining the low load of the boiler corresponds to 70% of the gasification furnace load working point, the coal consumed by driving the gas turbine or 100% of the gasification furnace load of the gas turbine and the produced ash are further reduced, and the proportion of the ash doped and burned is 6% of the rated load coal weight of the boiler.
In the coal gas equipment for blowing air, as shown in fig. 2, a gas pipe is connected to a gas turbine or a gas engine, and a gas pipeline is connected in parallel to a coal-fired boiler, and an exhaust pipe of the gas turbine or the gas engine is connected to the coal-fired boiler:
A gas peak regulating power station comprises a gas making device 14 for air blasting, a gas turbine or a gas turbine 7, a steam turbine 1, a boiler consisting of an air preheater 2, an economizer 3, a superheater 4, a steam drum 5 and an evaporator 6, an exhaust gas ash removing device 9, a desulfurization device 10 and a nitrogen oxide removal device 11. The fuel pipeline of the air-blast coal gas equipment 14 is connected with the gas turbine or the gas turbine 7 through the valve 8, and is connected with a pipeline in parallel to the coal-fired boiler through the valve 11, and a conveying line is arranged to convey gasified residual cinder coal ash from the air-blast coal gas equipment 14 to the blending site 15 of the boiler coal, and then the gasified residual cinder coal ash is blended into the coal to be sent to the boiler for combustion, so that the carbon conversion difficulty of the gasifier is reduced, and the burnout rate of final carbon is ensured. In addition, the exhaust pipe of the gas turbine or the gas turbine 7 is connected into the flue gas channel of the coal-fired boiler, so that the exhaust waste heat can be recovered through a boiler flue. When the power station is under high load, the gas turbine or the gas turbine 7 generates power by using coal gas, and the coal-fired boiler only burns the coal to generate power; the gas turbine or the gas turbine 7 is stopped or the gas consumption is reduced during low load, and the residual gas is conveyed to the boiler for mixed combustion with the coal, so that the load of the boiler is further reduced compared with the load during pure coal combustion, and the peak regulation range of the coal-fired power generation equipment is enlarged. The gas turbine or the gas turbine 7 exhaust pipe is connected with a boiler hearth to enable exhaust gas to participate in combustion, or a flue connected with the hearth is mixed with flue gas generated by the hearth. The flue gas flows into a flue from a hearth, the evaporators 6 around the hearth produce wet steam, steam-water separation is carried out by connecting a pipeline into a steam drum 5, and the steam drum water returns to the evaporators 6 through a down pipe to continue producing steam; heating the following working media after the flue gas enters a flue: the steam is connected with the superheater 4 by a pipeline from the upper part of the steam drum 5 to generate superheated steam, and the superheated steam is connected with the steam turbine 1 from the outlet of the superheater 4 to perform work and generate electricity; the inlet of the economizer 3 is connected with a boiler water supply pipeline, and the heated water supply is connected with a steam drum 5 from the outlet; the inlet of the air preheater 2 is connected with a blower to preheat the air supply, then the air supply is sent into a hearth to be burnt with pulverized coal to generate hot flue gas, the steam, the water supply and the preheated air are heated in a boiler flue, and then the air is sent out of the boiler to enter the ash removal device 9 for ash removal, enter the desulfurization device 10 for desulfurization and enter the nitrogen removal device 13 for denitrification. This allows the flow through and the production of sulfides and nitrogen oxides in the gas turbine or gas engine 7, and also the purification by means of the desulfurization and denitrification units of the coal-fired boiler, thus avoiding the repeated arrangement of two sets of purification units and saving the investment costs.
As shown in fig. 3, a gas fuel pipeline of a gas turbine or a gas engine 7 is connected with a plurality of gas pipelines of a gas making device for air blasting:
A gas peak regulating power station comprises a gas making device 14 for air blasting, a gas turbine or a gas turbine 7, a steam turbine 1, a boiler consisting of an air preheater 2, an economizer 3, a superheater 4, a steam drum 5 and an evaporator 6, an exhaust gas ash removing device 9, a desulfurization device 10 and a nitrogen oxide removal device 11. The fuel pipeline of the air-blast coal gas equipment 14 is connected with the gas turbine or the gas turbine 7 through the valve 8, and is connected with a pipeline in parallel to the coal-fired boiler through the valve 11, and a conveying line is arranged to convey gasified residual cinder coal ash from the air-blast coal gas equipment 14 to the blending site 15 of the boiler coal, and then the gasified residual cinder coal ash is blended into the coal to be sent to the boiler for combustion, so that the carbon conversion difficulty of the gasifier is reduced, and the burnout rate of final carbon is ensured. In addition, the exhaust pipe of the gas turbine or the gas turbine 7 is connected into the flue gas channel of the coal-fired boiler, so that the exhaust waste heat can be recovered through a boiler flue. When the power station is under high load, the gas turbine or the gas turbine 7 generates power by using coal gas, and the coal-fired boiler only burns the coal to generate power; the gas turbine or the gas turbine 7 is stopped or the gas consumption is reduced during low load, and the residual gas is conveyed to the boiler for mixed combustion with the coal, so that the load of the boiler is further reduced compared with the load during pure coal combustion, and the peak regulation range of the coal-fired power generation equipment is enlarged. The gas turbine or the gas turbine 7 exhaust pipe is connected with a boiler hearth to enable exhaust gas to participate in combustion, or a flue connected with the hearth is mixed with flue gas generated by the hearth. The flue gas flows into a flue from a hearth, the evaporators 6 around the hearth produce wet steam, steam-water separation is carried out by connecting a pipeline into a steam drum 5, and the steam drum water returns to the evaporators 6 through a down pipe to continue producing steam; heating the following working media after the flue gas enters a flue: the steam is connected with the superheater 4 by a pipeline from the upper part of the steam drum 5 to generate superheated steam, and the superheated steam is connected with the steam turbine 1 from the outlet of the superheater 4 to perform work and generate electricity; the inlet of the economizer 3 is connected with a boiler water supply pipeline, and the heated water supply is connected with a steam drum 5 from the outlet; the inlet of the air preheater 2 is connected with a blower to preheat the air supply, then the air supply is sent into a hearth to be burnt with pulverized coal to generate hot flue gas, the steam, the water supply and the preheated air are heated in a boiler flue, and then the air is sent out of the boiler to enter the ash removal device 9 for ash removal, enter the desulfurization device 10 for desulfurization and enter the nitrogen removal device 13 for denitrification. The outlets of the coal gas plant 14 from which the air is blown are connected in parallel to a gas turbine or a gas engine 7 via a gas fuel valve 8 to generate electricity.
As shown in fig. 4, the outlet of the coal-to-gas equipment 14 with one air blast is connected in parallel with a plurality of gas turbines or gas engines 7 by pipelines, and the plurality of gas turbines or gas engines 7 simultaneously feed exhaust gas into the coal-fired boiler:
A gas peak regulating power station comprises a gas making device 14 for air blasting, a gas turbine or a gas turbine 7, a steam turbine 1, a boiler consisting of an air preheater 2, an economizer 3, a superheater 4, a steam drum 5 and an evaporator 6, an exhaust gas ash removing device 9, a desulfurization device 10 and a nitrogen oxide removal device 11. The fuel pipeline of the air-blast coal gas equipment 14 is connected with the gas turbine or the gas turbine 7 through the valve 8, and is connected with a pipeline in parallel to the coal-fired boiler through the valve 11, and a conveying line is arranged to convey gasified residual cinder coal ash from the air-blast coal gas equipment 14 to the blending site 15 of the boiler coal, and then the gasified residual cinder coal ash is blended into the coal to be sent to the boiler for combustion, so that the carbon conversion difficulty of the gasifier is reduced, and the burnout rate of final carbon is ensured. In addition, the exhaust pipe of the gas turbine or the gas turbine 7 is connected into the flue gas channel of the coal-fired boiler, so that the exhaust waste heat can be recovered through a boiler flue. When the power station is under high load, the gas turbine or the gas turbine 7 generates power by using coal gas, and the coal-fired boiler only burns the coal to generate power; the gas turbine or the gas turbine 7 is stopped or the gas consumption is reduced during low load, and the residual gas is conveyed to the boiler for mixed combustion with the coal, so that the load of the boiler is further reduced compared with the load during pure coal combustion, and the peak regulation range of the coal-fired power generation equipment is enlarged. The gas turbine or the gas turbine 7 exhaust pipe is connected with a boiler hearth to enable exhaust gas to participate in combustion, or a flue connected with the hearth is mixed with flue gas generated by the hearth. The flue gas flows into a flue from a hearth, the evaporators 6 around the hearth produce wet steam, steam-water separation is carried out by connecting a pipeline into a steam drum 5, and the steam drum water returns to the evaporators 6 through a down pipe to continue producing steam; heating the following working media after the flue gas enters a flue: the steam is connected with the superheater 4 by a pipeline from the upper part of the steam drum 5 to generate superheated steam, and the superheated steam is connected with the steam turbine 1 from the outlet of the superheater 4 to perform work and generate electricity; the inlet of the economizer 3 is connected with a boiler water supply pipeline, and the heated water supply is connected with a steam drum 5 from the outlet; the inlet of the air preheater 2 is connected with a blower to preheat the air supply, then the air supply is sent into a hearth to be burnt with pulverized coal to generate hot flue gas, the steam, the water supply and the preheated air are heated in a boiler flue, and then the air is sent out of the boiler to enter the ash removal device 9 for ash removal, enter the desulfurization device 10 for desulfurization and enter the nitrogen removal device 13 for denitrification. The outlet of the air-blown coal gas equipment 14 is connected with a plurality of gas turbines or gas engines 7 in parallel through a fuel valve 8, and the exhaust pipes of the gas turbines or gas engines 7 are simultaneously connected with a boiler.
The exhaust pipe of the gas turbine or the gas turbine 7 is connected with the coal-fired boiler through an adjustable baffle door bypass chimney 12 as shown in fig. 5:
A gas peak regulating power station comprises a gas making device 14 for air blasting, a gas turbine or a gas turbine 7, a steam turbine 1, a boiler consisting of an air preheater 2, an economizer 3, a superheater 4, a steam drum 5 and an evaporator 6, an exhaust gas ash removing device 9, a desulfurization device 10 and a nitrogen oxide removal device 11. The fuel pipeline of the air-blast coal gas equipment 14 is connected with the gas turbine or the gas turbine 7 through the valve 8, and is connected with a pipeline in parallel to the coal-fired boiler through the valve 11, and a conveying line is arranged to convey gasified residual cinder coal ash from the air-blast coal gas equipment 14 to the blending site 15 of the boiler coal, and then the gasified residual cinder coal ash is blended into the coal to be sent to the boiler for combustion, so that the carbon conversion difficulty of the gasifier is reduced, and the burnout rate of final carbon is ensured. In addition, the exhaust pipe of the gas turbine or the gas turbine 7 is connected into the flue gas channel of the coal-fired boiler, so that the exhaust waste heat can be recovered through a boiler flue. When the power station is under high load, the gas turbine or the gas turbine 7 generates power by using coal gas, and the coal-fired boiler only burns the coal to generate power; the gas turbine or the gas turbine 7 is stopped or the gas consumption is reduced during low load, and the residual gas is conveyed to the boiler for mixed combustion with the coal, so that the load of the boiler is further reduced compared with the load during pure coal combustion, and the peak regulation range of the coal-fired power generation equipment is enlarged. The gas turbine or the gas turbine 7 exhaust pipe is connected with a boiler hearth to enable exhaust gas to participate in combustion, or a flue connected with the hearth is mixed with flue gas generated by the hearth. The flue gas flows into a flue from a hearth, the evaporators 6 around the hearth produce wet steam, steam-water separation is carried out by connecting a pipeline into a steam drum 5, and the steam drum water returns to the evaporators 6 through a down pipe to continue producing steam; heating the following working media after the flue gas enters a flue: the steam is connected with the superheater 4 by a pipeline from the upper part of the steam drum 5 to generate superheated steam, and the superheated steam is connected with the steam turbine 1 from the outlet of the superheater 4 to perform work and generate electricity; the inlet of the economizer 3 is connected with a boiler water supply pipeline, and the heated water supply is connected with a steam drum 5 from the outlet; the inlet of the air preheater 2 is connected with a blower to preheat the air supply, then the air supply is sent into a hearth to be burnt with pulverized coal to generate hot flue gas, the steam, the water supply and the preheated air are heated in a boiler flue, and then the air is sent out of the boiler to enter the ash removal device 9 for ash removal, enter the desulfurization device 10 for desulfurization and enter the nitrogen removal device 13 for denitrification. The exhaust duct of the gas turbine or gas turbine 7 is connected to the boiler via a bypass chimney 12 with an adjusting damper door, the damper door of the bypass chimney 12 being used to adjust the flow of flue gases distributed into the boiler and bypass blowdown.
The gas turbine or the gas turbine exhaust is connected with the waste heat boiler 16 and then connected with a desulfurization device or a nitrogen oxide removal device after the coal-fired boiler as shown in fig. 6:
A gas peak regulating power station comprises a gas making device 14 for air blasting, a gas turbine or a gas turbine 7, a steam turbine 1, a boiler consisting of an air preheater 2, an economizer 3, a superheater 4, a steam drum 5 and an evaporator 6, an exhaust gas ash removing device 9, a desulfurization device 10 and a nitrogen oxide removal device 11. The fuel pipeline of the air-blast coal gas equipment 14 is connected with the gas turbine or the gas turbine 7 through the valve 8, and is connected with a pipeline in parallel to the coal-fired boiler through the valve 11, and a conveying line is arranged to convey gasified residual cinder coal ash from the air-blast coal gas equipment 14 to the blending site 15 of the boiler coal, and then the gasified residual cinder coal ash is blended into the coal to be sent to the boiler for combustion, so that the carbon conversion difficulty of the gasifier is reduced, and the burnout rate of final carbon is ensured. When the power station is under high load, the gas turbine or the gas turbine 7 generates power by using coal gas, and the coal-fired boiler only burns the coal to generate power; the gas turbine or the gas turbine 7 is stopped or the gas consumption is reduced during low load, and the residual gas is conveyed to the boiler for mixed combustion with the coal, so that the load of the boiler is further reduced compared with the load during pure coal combustion, and the peak regulation range of the coal-fired power generation equipment is enlarged. The gas turbine or the gas turbine 7 exhaust pipe is connected with the waste heat boiler 16 to heat the working medium. The flue gas flows into a flue from a hearth, the evaporators 6 around the hearth produce wet steam, steam-water separation is carried out by connecting a pipeline into a steam drum 5, and the steam drum water returns to the evaporators 6 through a down pipe to continue producing steam; heating the following working media after the flue gas enters a flue: the steam is connected with the superheater 4 by a pipeline from the upper part of the steam drum 5 to generate superheated steam, and the superheated steam is connected with the steam turbine 1 from the outlet of the superheater 4 to perform work and generate electricity; the inlet of the economizer 3 is connected with a boiler water supply pipeline, and the heated water supply is connected with a steam drum 5 from the outlet; the inlet of the air preheater 2 is connected with a blower to preheat the air supply, then the air supply is sent into a hearth to be burnt with pulverized coal to generate hot flue gas, the steam, the water supply and the preheated air are heated in a boiler flue, and then the air is sent out of the boiler to enter the ash removal device 9 for ash removal, enter the desulfurization device 10 for desulfurization and enter the nitrogen removal device 13 for denitrification. This allows the flow through and the production of sulfides and nitrogen oxides in the gas turbine or gas engine 7, and also the purification by means of the desulfurization and denitrification units of the coal-fired boiler, thus avoiding the repeated arrangement of two sets of purification units and saving the investment costs.
Claims (13)
1. The utility model provides a coal gas peak regulation power plant, it includes the coal gas equipment of air blast, gas turbine or gas turbine, the steam turbine, and the boiler that comprises air preheater, the economizer, the superheater, the steam drum, the evaporimeter, exhaust ash removal device, desulfurization device and nitrogen oxide removal device, the coal gas equipment fuel pipeline of air blast connects gas turbine or gas turbine gas fuel pipeline, simultaneously the fuel pipeline still connects in parallel to coal-fired boiler, and be equipped with the conveying line and send gasification residual cinder coal ash from the coal gas equipment of air blast to the blending place of boiler fire coal, boiler evaporimeter produces wet steam, insert the steam drum steam-water separation by the pipeline, the steam drum water returns to the evaporimeter through the downcomer and continues to produce steam; the steam is connected with a superheater from the upper part of a steam drum through a pipeline, and the superheated steam is connected with a steam turbine from an outlet of the superheater to perform work and power generation; the inlet of the economizer is connected with a boiler water supply pipeline, and the heated water supply is connected with a steam drum from the outlet; the inlet of the air preheater is connected with a blower to preheat the air supply, then the air supply is fed into a hearth to burn with pulverized coal to generate hot flue gas, steam, water supply and preheated air are heated in a boiler flue, and then the air is discharged from a boiler to enter an ash removal device for ash removal, enter a desulfurization device for desulfurization and enter a nitrogen oxide removal device for denitrification, and the air preheater is characterized in that: the fuel pipeline of the air-blast coal-to-gas equipment is connected with a gas turbine or a gas turbine, and is connected to the coal-fired boiler in parallel, and a conveying line is arranged to convey gasified residual cinder coal ash from the air-blast coal-to-gas equipment to a blending site of the boiler coal, and the gasified residual cinder coal ash is conveyed to the boiler for combustion after blending.
2. A gas peaking plant as claimed in claim 1, characterized in that: and (3) the exhaust gas of the gas turbine or the gas turbine is connected into a boiler flue gas channel through an exhaust pipeline, and then is connected into an ash removing device, a desulfurization device and a nitrogen oxide removing device through a boiler flue.
3. A gas peaking plant according to claim 1 or 2, characterized in that: the gas turbine or the gas fuel pipeline for the gas turbine is connected with a coal gas equipment fuel pipeline for air blasting.
4. A gas peaking plant according to claim 1 or 2, characterized in that: the gas turbine or the gas fuel pipeline for the gas turbine is connected with a plurality of air blast coal gas equipment fuel pipelines.
5. A gas peaking plant according to claim 1 or 2, characterized in that: the air-blown coal gas plant is connected to a plurality of gas turbines or gas turbines.
6. A gas peaking plant as claimed in claim 2, characterized in that: the gas turbine or the gas engine is one, and an exhaust pipeline of the gas turbine or the gas engine is connected with a coal-fired boiler.
7. A gas peaking plant as claimed in claim 2, characterized in that: the gas turbine or the gas turbine is provided with a plurality of gas turbines, and the exhaust pipeline of the gas turbines is connected with a coal-fired boiler.
8. A gas peaking plant as claimed in claim 2, characterized in that: the gas turbine or the gas turbine exhaust pipe is connected with the boiler, and a bypass chimney with a baffle door capable of adjusting the flow of the flue gas entering the boiler is arranged between the outlet of the exhaust pipe and the boiler.
9. A gas peaking plant as claimed in claim 1, characterized in that: the gas turbine or the gas turbine is connected with a waste heat boiler at an exhaust outlet and then is connected with a desulfurization device or a nitrogen oxide removal device after a flue of the coal-fired boiler.
10. A gas peaking plant according to claim 1 or 2, characterized in that: the air blast coal gas equipment is a normal pressure air blast gasifier.
11. A gas peaking plant according to claim 1 or 2, characterized in that: the air blast coal gas equipment is a pressurized air blast gasifier.
12. The ash back firing method of the gas peak shaver power station according to claim 1, wherein the method comprises the following steps: delivering the gasified residual cinder coal ash from the air-blown coal gas equipment to a blending site of boiler coal, and blending the boiler coal to burn together, wherein the blending can be divided into the following steps:
1) Blending gasified residual cinder coal ash conveyed from air-blown coal-to-gas equipment with coal;
2) The proportion of the ash slag doped firing is within the range of 0.1-40% of the rated load coal weight of the boiler;
3) And (5) feeding the mixture into a coal-fired boiler for combustion.
13. The ash back firing method of the gas peak shaver power station according to claim 12, wherein the method comprises the following steps: the proportion of the ash slag is 17% or 6% of the rated load coal weight of the boiler.
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| CN115506888A (en) * | 2022-10-27 | 2022-12-23 | 国网山东省电力公司电力科学研究院 | Method and system for responding to power grid regulation requirement of thermal power generating unit coupled gas turbine |
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