CN113236387B - Gas turbine coal machine combined power generation system and method - Google Patents

Gas turbine coal machine combined power generation system and method Download PDF

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Publication number
CN113236387B
CN113236387B CN202110443062.XA CN202110443062A CN113236387B CN 113236387 B CN113236387 B CN 113236387B CN 202110443062 A CN202110443062 A CN 202110443062A CN 113236387 B CN113236387 B CN 113236387B
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coal
flue gas
fired boiler
mixed
air box
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CN113236387A (en
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童家麟
刘文胜
徐小琼
孙五一
孙洁
郑建平
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Electric Power Research Institute of State Grid Zhejiang Electric Power Co Ltd
Hangzhou E Energy Electric Power Technology Co Ltd
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Electric Power Research Institute of State Grid Zhejiang Electric Power Co Ltd
Hangzhou E Energy Electric Power Technology Co Ltd
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01KSTEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K23/00Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
    • F01K23/02Plants 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
    • F01K23/06Plants 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
    • F01K23/10Plants 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01KSTEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K11/00Plants characterised by the engines being structurally combined with boilers or condensers
    • F01K11/02Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01KSTEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K13/00General layout or general methods of operation of complete plants
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01KSTEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K21/00Steam engine plants not otherwise provided for
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00Combustion technologies with mitigation potential
    • Y02E20/16Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]

Abstract

The invention discloses a combined power generation system and method of a gas turbine and a coal machine. At present, one of the factors that the efficiency of the coal-fired boiler is difficult to further improve is that the inlet air temperature of the boiler is lower, and the efficiency of the gas turbine combined cycle is difficult to further improve due to the lower efficiency of the waste heat boiler and the steam turbine. The technical scheme adopted by the invention is as follows: according to the highest allowable exhaust pressure corresponding to the load of the combustion engine, high-temperature flue gas discharged by the combustion engine is sent into an underground cave or a waste heat boiler, and according to the actual operation condition of the coal-fired boiler, the high-temperature flue gas in the underground cave is sent into the coal-fired boiler to replace part of low-temperature furnace air. The invention replaces the original low-temperature secondary air and over-fire air with the high-temperature flue gas part discharged by the gas turbine, can effectively improve the efficiency and the low-load operation performance of the coal-fired boiler, and can also effectively improve the utilization efficiency of the waste heat of the discharged smoke of the gas turbine.

Description

Gas turbine coal machine combined power generation system and method
Technical Field
The invention belongs to the field of generator sets, and particularly relates to a combined power generation system and method of a gas turbine and a coal machine.
Background
In recent years, coal-fired power generation is still the most important component of the power supply in China, along with the continuous importance of various coal-fired power generation enterprises on energy conservation and emission reduction, the effective reduction of the coal consumption of unit power generation becomes an important work content of various coal-fired power generation enterprises, and the effective reduction of irreversible losses such as combustion, heat transfer and the like generated in pulverized coal combustion of a coal-fired boiler is undoubtedly an important direction for reducing the coal consumption of unit power generation in the future. One of the important factors for large irreversible losses such as combustion and heat transfer generated in pulverized coal combustion is that the air inlet temperature of a coal-fired boiler is low, at present, under full load, the air inlet temperature of the coal-fired boiler passing through an air preheater is about 350 ℃, and is limited by factors such as waste heat of exhaust gas of the coal-fired boiler, heat transfer of the air preheater and the like, the air inlet temperature of the coal-fired boiler is difficult to further increase, and the irreversible losses such as combustion and heat transfer are difficult to further suppress. Meanwhile, the inlet air temperature of the coal-fired boiler is relatively lower under low load, so that pulverized coal combustion is more difficult, and the low-load operation capability of the coal-fired boiler is increasingly limited.
The gas turbine power generation has the advantages of flexible start and stop, high load response speed, less smoke pollution and the like, and is widely applied in recent years. The exhaust gas temperature of a combustion engine is higher and is usually higher than 600 ℃, the single-machine efficiency of the combustion engine is relatively lower, and the combustion engine is generally matched with devices such as a waste heat boiler and the like to form a combined cycle unit, but the efficiency of the waste heat boiler is far lower than that of a coal-fired boiler due to smaller capacity and lower operation parameters.
In recent years, the use of underground caverns for storing natural gas, compressed air, and the like has been applied at home and abroad, and the storage of flue gas discharged from combustion engines using the same is technically undoubtedly feasible.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a combined power generation system and method of a gas turbine and a coal machine, so as to effectively improve the operation efficiency of a coal-fired unit and a gas-fired unit and improve the low-load operation performance of the coal-fired unit.
Therefore, the invention adopts a technical scheme that: a gas turbine and coal machine combined power generation method comprises the following steps:
step 1: judging whether the sum of the high-temperature flue gas pressure stored in the underground cave and the resistance of the flue gas pipeline is lower than the highest allowable exhaust pressure corresponding to the load of the combustion engine or not, if so, executing the step 2, and if not, executing the step 3;
step 2: sending high-temperature flue gas exhausted by a combustion engine into an underground cave;
and step 3: sending high-temperature flue gas discharged by a gas turbine into a waste heat boiler;
and 4, step 4: high-temperature flue gas from the underground cave is sent into a mixing secondary air box of the coal-fired boiler, and is mixed with secondary air in the mixing secondary air box to replace part of low-temperature secondary air, and mixed air flow is sprayed into the coal-fired boiler to be used for burning coal powder.
And 5: sending high-temperature flue gas from an underground cave into a mixed burn-out air box of the coal-fired boiler, mixing the high-temperature flue gas with the burn-out air in the mixed burn-out air box to replace part of low-temperature burn-out air, and spraying mixed gas flow into the coal-fired boiler for burning out coal powder;
and 6: judging whether the oxygen values of the outlet of the reducing area of the coal-fired boiler and the outlet of the hearth at the moment can reach the oxygen values of the outlet of the reducing area and the outlet of the hearth corresponding to the load of the coal-fired boiler or not according to the oxygen amounts measured by the oxygen measuring points of the outlet of the reducing area and the outlet of the hearth of the coal-fired boiler and the load of the coal-fired boiler, and if not, executing the step 7;
and 7: further controlling the amount of high-temperature flue gas, the amount of secondary air and the amount of over-fire air to meet the requirement of pulverized coal combustion of the coal-fired boiler.
Further, when the pressure of the mixed secondary air box corresponding to the load of the coal-fired boiler is higher than the pressure of the underground cave, the feeding of high-temperature flue gas from the underground cave to the mixed secondary air box of the coal-fired boiler is stopped.
Further, when the pressure of the mixed burnout air box corresponding to the load of the coal-fired boiler is higher than the pressure of the underground cave, the high-temperature flue gas is stopped being fed from the underground cave to the mixed burnout air box of the coal-fired boiler.
Furthermore, the pressure of the mixed secondary air box and the mixed burnout air box on the coal-fired boiler needs to be maintained at the pressure corresponding to the load of the coal-fired boiler, and the pressure can be further controlled by the opening degree of a burner air door on the mixed secondary air box and the opening degree of a burner air door on the mixed burnout air box respectively.
The other technical scheme adopted by the invention is as follows: the gas turbine and coal machine combined power generation system comprises a gas turbine, a waste heat boiler, a coal-fired boiler, an underground cave and a control system;
the combustion engine is connected with the waste heat boiler through a smoke exhaust main pipe and a first smoke exhaust pipeline, and is connected with the underground cave through the smoke exhaust main pipe and a second smoke exhaust pipeline;
the coal-fired boiler is provided with a mixed secondary air box and a mixed burnout air box, a secondary air quantity adjusting baffle is arranged at a secondary air inlet of the mixed secondary air box, and a burnout air quantity adjusting baffle is arranged at a burnout air inlet of the mixed burnout air box;
the underground cave is connected with the mixed secondary air box and the mixed burnout air box through a flue gas pipeline, a flue gas first adjusting baffle is arranged at a flue gas inlet of the mixed secondary air box, and a flue gas second adjusting baffle is arranged at a flue gas inlet of the mixed burnout air box;
a plurality of pressure measuring points are arranged on the underground cave, the mixed secondary air box and the mixed burnout air box;
a plurality of oxygen amount measuring points are arranged at the outlet of the reduction zone and the outlet of the hearth of the coal-fired boiler;
the control system is respectively connected with the first flue gas adjusting baffle, the second flue gas adjusting baffle, the secondary air quantity adjusting baffle, the burnout air quantity adjusting baffle, the pressure measuring point and the oxygen quantity measuring point.
Furthermore, a first flue gas isolation baffle is arranged at the inlet of the underground cave and is connected with the control system.
Furthermore, a second flue gas isolation baffle is arranged at the flue gas inlet of the waste heat boiler and connected with the control system.
Furthermore, a third flue gas isolation baffle is arranged at the flue gas inlet of the mixed secondary air box and is connected with the control system.
Furthermore, a fourth flue gas isolation baffle is arranged at a flue gas inlet of the mixed burnout air box and is connected with the control system.
Furthermore, the underground cave is provided with an air exhaust fan.
Furthermore, when the pipeline from the combustion engine to the underground cave is in model selection, straight pipelines with consistent pipe diameters are selected as much as possible, and even though elbows are reduced during arrangement, the smoke resistance is reduced.
Furthermore, when the pipeline from the underground cave to the mixed secondary air box is in model selection, straight pipelines with consistent pipe diameters are selected as much as possible, and even though elbows are reduced during arrangement, the smoke resistance is reduced.
Furthermore, when the pipeline from the underground cave to the mixed burnout air box is selected, straight pipelines with consistent pipe diameters are selected as much as possible, and even though elbows are reduced during arrangement, the smoke resistance is reduced.
Furthermore, the volume of discharged smoke should not be too large when the combustion engine is in model selection, the volume of discharged smoke should be matched with the volume of an underground cave, a large amount of high-temperature smoke cannot be consumed due to low load of the coal-fired boiler at night, and the underground cave should at least store the full-load discharged smoke volume of the combustion engine for 8 hours.
Further, the air conditioner is provided with a fan,
compared with the prior art, the invention has the following beneficial effects:
1) The exhaust of the gas turbine can be flexibly switched to be sent into an underground cave or a waste heat boiler according to the load of the gas turbine, the exhaust pressure of the gas turbine is always lower than the highest allowable exhaust pressure corresponding to the load of the gas turbine, and the efficient operation of the gas turbine is further ensured.
2) The exhaust gas temperature of the combustion engine is high, and the oxygen content in the exhaust gas is high, generally more than 10%, in combined cycle power generation, although the exhaust gas temperature is reduced after passing through the waste heat boiler, the oxygen content in the exhaust gas cannot be reduced, so that the exhaust gas loss of the combined cycle power generation is very large. According to the gas turbine and coal machine combined power generation system and method, high-temperature flue gas discharged by the gas turbine can be sent into the coal-fired boiler for further combustion, the oxygen content of the high-temperature flue gas passing through the coal-fired boiler can be generally reduced to about 3% -6%, and the smoke discharge loss can be effectively reduced.
3) The original air supply temperature of the coal-fired boiler is usually lower and is about 350 ℃, and after the high-temperature flue gas discharged by a combustion engine is used for replacing the air supply of the original coal-fired boiler, the efficiency of the coal-fired boiler is effectively improved, and the low-load operation capacity of the coal-fired boiler can also be improved.
4) The Chinese patent CN107327322A also provides a gas turbine and coal machine coupled power generation system, but the system cannot control the high-temperature smoke volume of a gas turbine used by a coal-fired boiler, and the problem that the smoke discharged by the gas turbine is not matched with the smoke volume required by the coal-fired boiler possibly occurs.
5) The efficiency of the coal-fired boiler is generally more than 90%, the efficiency of the waste heat boiler is usually lower, usually only about 85%, the efficiency of a steam turbine in combined cycle is also usually lower than that of a steam turbine in a coal machine, high-temperature flue gas exhausted by a combustion engine is sent into the coal-fired boiler, and the energy utilization rate of the high-temperature flue gas can be effectively improved.
6) The underground cave is generally good in heat preservation performance, can maintain the stored high-temperature flue gas at a certain temperature level for a long time, has good energy storage performance, can utilize the natural underground cave, has low requirements on the cave and does not need to invest in the aspect.
Drawings
FIG. 1 is a flow chart of a combined gas turbine and coal machine power generation method according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a gas turbine coal combined power generation system according to an embodiment of the present invention.
The system comprises a combustion engine 1, a smoke exhaust main pipe 2, a waste heat boiler 3, a coal-fired boiler 4, a first smoke exhaust pipeline 5, a second smoke exhaust pipeline 6, an underground cave 7, an air exhaust fan 8, a first smoke isolation baffle 9, a second smoke isolation baffle 10, a smoke pipeline 11, a secondary mixed air box 12, a mixed burn-out air box 13, a third smoke isolation baffle 14, a first smoke adjustment baffle 15, a fourth smoke isolation baffle 16, a second smoke adjustment baffle 17, a secondary air quantity adjustment baffle 18, an over-fired air quantity adjustment baffle 19, a pressure measuring point 20, an oxygen amount measuring point 21 and a control system 22.
Detailed Description
The following detailed description of the embodiments of the present invention is provided in connection with the accompanying drawings for the purpose of facilitating understanding and understanding of the technical solutions of the present invention. It is to be understood that the specific embodiments described herein are merely illustrative of some, but not all, embodiments of the invention and that other embodiments may be devised by those skilled in the art without the use of the inventive faculty and the scope of the invention is to be protected.
Example 1
Referring to fig. 1, a flow chart of a combined power generation method using a coal combustion engine according to an embodiment of the present invention includes the following steps:
step 1: judging whether the sum of the high-temperature flue gas pressure stored in the underground cave and the resistance of the flue gas pipeline is lower than the highest allowable exhaust pressure corresponding to the load of the combustion engine or not, if so, executing the step 2, and if not, executing the step 3;
step 2: sending high-temperature flue gas exhausted by a combustion engine into an underground cave;
and 3, step 3: sending high-temperature flue gas discharged by a gas turbine into a waste heat boiler;
and 4, step 4: high-temperature flue gas from the underground cave is sent into a mixing secondary air box of the coal-fired boiler, and is mixed with secondary air in the mixing secondary air box to replace part of low-temperature secondary air, and mixed air flow is sprayed into the coal-fired boiler to be used for burning coal powder.
And 5: high-temperature flue gas from the underground cave is sent into a mixed over-fire air box of the coal-fired boiler, and is mixed with over-fire air in the mixed over-fire air box to replace part of low-temperature over-fire air, and mixed air flow is sprayed into the coal-fired boiler to be used for burning coal powder.
Step 6: judging whether the oxygen values of the outlet of the reducing area of the coal-fired boiler and the outlet of the hearth at the moment can reach the oxygen values of the outlet of the reducing area and the outlet of the hearth corresponding to the load of the coal-fired boiler or not according to the oxygen amounts measured by the oxygen measuring points of the outlet of the reducing area and the outlet of the hearth of the coal-fired boiler and the load of the coal-fired boiler, and if not, executing the step 7;
and 7: further controlling the amount of high-temperature flue gas, the amount of secondary air and the amount of over-fire air to meet the requirement of pulverized coal combustion of the coal-fired boiler.
Specifically, when the pressure of the mixed secondary air box corresponding to the load of the coal-fired boiler is higher than the pressure of the underground cave, the feeding of high-temperature flue gas from the underground cave to the mixed secondary air box of the coal-fired boiler is stopped.
Specifically, when the pressure of the mixed burnout air box corresponding to the load of the coal-fired boiler is higher than the pressure of the underground cave, the high-temperature flue gas is stopped being fed from the underground cave to the mixed burnout air box of the coal-fired boiler.
Specifically, the pressure of the mixed secondary windbox and the mixed burnout windbox on the coal-fired boiler needs to be maintained at a pressure corresponding to the load of the coal-fired boiler, and the pressure can be further controlled by the opening degree of a burner air door on the mixed secondary windbox and the opening degree of a burner air door on the mixed burnout windbox respectively.
Example 2
Fig. 2 is a schematic structural diagram of a combined power generation system with a coal combustion engine according to the present invention. The system comprises: the system comprises a gas turbine 1, a waste heat boiler 3, a coal-fired boiler 4, an underground cave 7 and a control system 22.
The gas turbine 1 is connected with the waste heat boiler 3 through the smoke exhaust main pipe 2 and the first smoke exhaust pipeline 5, and is connected with the underground cave 7 through the smoke exhaust main pipe 2 and the second smoke exhaust pipeline 6, a second smoke isolation baffle 10 is arranged at an inlet of the waste heat boiler 3, and a first smoke isolation baffle 9 is arranged at an inlet of the underground cave 5. The underground cavern 7 is provided with an air exhaust fan 8.
The coal-fired boiler 4 is provided with a mixed secondary air box 12 and a mixed burnout air box 13.
The underground cave 7 is connected with a mixed secondary air box 12 and a mixed burnout air box 13 through a flue gas pipeline 11, a flue gas third isolation baffle 14 and a flue gas first adjusting baffle 15 are arranged at a flue gas inlet of the mixed secondary air box 12, and a flue gas fourth isolation baffle 16 and a flue gas second adjusting baffle 17 are arranged at a flue gas inlet of the mixed burnout air box 13.
A secondary air quantity adjusting baffle 18 is arranged at the secondary air inlet of the mixed secondary air box 12.
An overfire air quantity adjusting baffle plate 19 is arranged at an overfire air inlet of the mixed overfire air box 13.
And a plurality of pressure measuring points 20 are arranged on the underground cave 5, the mixed secondary air box 12 and the mixed burnout air box 13.
The outlet of the reduction zone and the outlet of the hearth of the coal-fired boiler 4 are provided with a plurality of oxygen measuring points 21.
The control system 22 is connected with the first flue gas isolation baffle 9, the second flue gas isolation baffle 10, the third flue gas isolation baffle 14, the first flue gas regulation baffle 15, the fourth flue gas isolation baffle 16, the second flue gas regulation baffle 17, the secondary air quantity regulation baffle 18, the burnout air quantity regulation baffle 19, the pressure measuring point 20 and the oxygen quantity measuring point 21.
The operation method of the gas turbine coal machine combined power generation system comprises the following steps:
the measured pressures are sent to a control system 22 by a plurality of pressure measuring points 20 in the underground cavern 7, the mixed secondary air box 12 and the mixed burnout air box 13, and the control system calculates the average pressure value in the underground cavern 7, the mixed secondary air box 12 and the mixed burnout air box 13. The detected oxygen amount is sent to a control system 22 by a plurality of oxygen amount measuring points 21 at the outlet of the reducing area and the outlet of the hearth of the coal-fired boiler 4, and the control system 22 calculates the average oxygen amount of the outlet of the reducing area and the outlet of the hearth of the coal-fired boiler 4.
High-temperature flue gas discharged by the combustion engine 1 enters the waste heat boiler 3 through the flue gas main pipe 2 and the first flue gas exhaust pipeline 5, and enters the underground cave 7 through the flue gas main pipe 2 and the second flue gas exhaust pipeline 6. In order to ensure that the combustion engine 1 runs efficiently, the exhaust gas pressure of the combustion engine 1 cannot be higher than the maximum allowable exhaust gas pressure corresponding to the load of the combustion engine, when the sum of the average pressure value in the underground cavern 7, the resistance of the exhaust gas main pipe 2 and the resistance of the first exhaust gas pipe 5 is lower than the maximum allowable exhaust gas pressure corresponding to the load of the combustion engine 1, the control system 22 closes the second isolation baffle 10 of the exhaust gas, high-temperature flue gas exhausted by the combustion engine 1 is sent to the underground cavern 7, and when the sum of the average pressure value in the underground cavern 7, the resistance of the exhaust gas main pipe 2 and the resistance of the first exhaust gas pipe 5 is higher than the maximum allowable exhaust gas pressure corresponding to the load of the combustion engine 1, the control system 21 closes the first isolation baffle 6 of the exhaust gas, and sends the high-temperature flue gas exhausted by the combustion engine 1 to the waste heat boiler 3.
Before the underground cavern 7 is put into operation for the first time, all gas in the underground cavern 7 is pumped out by using an air exhaust fan 8. When the underground cave 7 runs, the air exhaust fan 8 is in a closed state.
When the pressure value of the mixed secondary air box 12 corresponding to the load of the coal-fired boiler 4 is higher than the average pressure value of the underground cavern 7, the control system 22 closes the third flue gas isolation baffle 14, and when the pressure value of the mixed secondary air box 12 corresponding to the load of the coal-fired boiler 4 is lower than the average pressure value of the underground cavern 7, the control system 22 opens the third flue gas isolation baffle 14.
When the third flue gas isolation baffle 14 is in an open state, the control system 22 controls the opening degree of the first flue gas adjusting baffle 15, so that the average value of the oxygen content at the reducing area of the coal-fired boiler 4 reaches the oxygen content value at the reducing area corresponding to the load of the coal-fired boiler 4, if the first flue gas adjusting baffle 15 is fully opened, the average value of the oxygen content at the reducing area of the coal-fired boiler 4 still does not reach the oxygen content value at the reducing area corresponding to the load of the coal-fired boiler 4, and the control system 22 controls the opening degree of the second air volume adjusting baffle 18, so that the average value of the oxygen content at the reducing area of the coal-fired boiler 4 reaches the oxygen content value at the reducing area corresponding to the load of the coal-fired boiler 4.
When the third flue gas isolation baffle 14 is in a closed state, the control system 22 controls the opening degree of the secondary air quantity adjusting baffle 18, so that the average value of the oxygen quantity at the reducing area of the coal-fired boiler 4 reaches the oxygen quantity value at the reducing area corresponding to the load of the coal-fired boiler 4.
When the pressure value of the mixed burnout air box 13 corresponding to the load of the coal-fired boiler 4 is higher than the average pressure value of the underground cavern 7, the control system 22 closes the fourth isolation baffle 16 of the flue gas, and when the pressure value of the mixed burnout air box 13 corresponding to the load of the coal-fired boiler 4 is smaller than the average pressure value of the underground cavern 7, the control system 22 opens the fourth isolation baffle 16 of the flue gas.
When the fourth flue gas isolation baffle 16 is in an open state, the control system 22 controls the opening degree of the second flue gas adjusting baffle 17, so that the average oxygen amount of the hearth outlet of the coal-fired boiler 4 reaches the oxygen amount value of the hearth outlet corresponding to the load of the coal-fired boiler 4, if the first flue gas adjusting baffle 16 is fully opened, the average oxygen amount of the hearth outlet of the coal-fired boiler 4 still does not reach the oxygen amount value of the hearth outlet corresponding to the load of the coal-fired boiler 4, and the control system 22 controls the opening degree of the burnout air volume adjusting baffle 19, so that the average oxygen amount of the hearth outlet of the coal-fired boiler 4 reaches the oxygen amount value of the hearth outlet corresponding to the load of the coal-fired boiler 4.
When the fourth isolation baffle 16 for flue gas is in a closed state, the control system 22 controls the opening of the burnout air quantity adjusting baffle 19, so that the average value of the oxygen quantity at the furnace outlet of the coal-fired boiler 4 reaches the furnace outlet oxygen quantity value corresponding to the load of the coal-fired boiler 4.
The average pressure values of the mixed secondary air box 12 and the mixed burnout air box 13 of the coal-fired boiler 4 are required to be maintained at the pressure corresponding to the load of the coal-fired boiler 4, and the pressure values are further controlled by the opening degrees of the burner air doors of the mixed secondary air box 12 and the burner air doors of the mixed burnout air box 13 respectively.

Claims (10)

1. The combined power generation method of the gas turbine and the coal machine is characterized by comprising the following steps of:
step 1: judging whether the sum of the high-temperature flue gas pressure stored in the underground cave and the resistance of the flue gas pipeline is lower than the highest allowable exhaust pressure corresponding to the load of the combustion engine or not, if so, executing the step 2, and if not, executing the step 3;
step 2: sending high-temperature flue gas exhausted by a combustion engine into an underground cave;
and step 3: sending high-temperature flue gas discharged by a gas turbine into a waste heat boiler;
and 4, step 4: sending high-temperature flue gas from an underground cave into a mixed secondary air box of the coal-fired boiler, mixing the high-temperature flue gas with secondary air in the mixed secondary air box to replace part of low-temperature secondary air, and spraying the obtained mixed gas flow into the coal-fired boiler for burning coal powder;
and 5: sending high-temperature flue gas from an underground cave into a mixed burnout air box of the coal-fired boiler, mixing the high-temperature flue gas with burnout air in the mixed burnout air box to replace part of low-temperature burnout air, and spraying the obtained mixed gas flow into the coal-fired boiler for burning out coal powder;
step 6: judging whether the oxygen values of the outlet of the reducing area of the coal-fired boiler and the outlet of the hearth at the moment can reach the oxygen values of the outlet of the reducing area and the outlet of the hearth corresponding to the load of the coal-fired boiler or not according to the oxygen amounts measured by the oxygen measuring points of the outlet of the reducing area and the outlet of the hearth of the coal-fired boiler and the load of the coal-fired boiler, and if not, executing the step 7;
and 7: further controlling the amount of the injected high-temperature flue gas, the amount of secondary air and the amount of over-fire air so as to meet the requirement of pulverized coal combustion of the coal-fired boiler.
2. The coal-fired machine combined power generation method of claim 1, wherein when the pressure of the mixed secondary air box corresponding to the load of the coal-fired boiler is higher than the pressure of the underground cavern, the feeding of high-temperature flue gas from the underground cavern to the mixed secondary air box of the coal-fired boiler is stopped.
3. The coal-fired machine combined power generation method of claim 1, wherein when the pressure of the mixed burnout air box corresponding to the load of the coal-fired boiler is higher than the pressure of the underground cavern, the feeding of high-temperature flue gas from the underground cavern to the mixed burnout air box of the coal-fired boiler is stopped.
4. The coal-fired machine combined power generation method of claim 1, wherein the pressure of the mixed secondary windbox and the mixed burnout windbox on the coal-fired boiler is maintained at a pressure corresponding to the load of the coal-fired boiler, and the pressure is further controlled by the opening degree of the burner damper on the mixed secondary windbox and the opening degree of the burner damper on the mixed burnout windbox, respectively.
5. A gas turbine and coal machine combined power generation system comprises a gas turbine (1), a waste heat boiler (3), a coal-fired boiler (4), an underground cave (7) and a control system (22), and is characterized in that,
the combustion engine (1) is connected with the waste heat boiler (3) through a smoke exhaust main pipe (2) and a first smoke exhaust pipeline (5), and the combustion engine (1) is connected with an underground cave (7) through the smoke exhaust main pipe (2) and a second smoke exhaust pipeline (6);
a mixed secondary air box (12) and a mixed burnout air box (13) are arranged on the coal-fired boiler (4), a secondary air quantity adjusting baffle (18) is arranged at a secondary air inlet of the mixed secondary air box (12), and a burnout air quantity adjusting baffle (19) is arranged at a burnout air inlet of the mixed burnout air box (13);
the underground cave (7) is connected with a mixed secondary air box (12) and a mixed burnout air box (13) through a flue gas pipeline (11), a flue gas first adjusting baffle (15) is arranged at a flue gas inlet of the mixed secondary air box (12), and a flue gas second adjusting baffle (17) is arranged at a flue gas inlet of the mixed burnout air box (13);
a plurality of pressure measuring points (20) are arranged on the underground cave (7), the mixed secondary air box (12) and the mixed burnout air box (13);
a plurality of oxygen amount measuring points (21) are arranged at the outlet of the reduction zone and the outlet of the hearth of the coal-fired boiler (4);
the control system (22) is respectively connected with the first flue gas regulating baffle (15), the second flue gas regulating baffle (17), the secondary air quantity regulating baffle (18), the burnout air quantity regulating baffle (19), the pressure measuring point (20) and the oxygen quantity measuring point (21).
6. The gas turbine coal machine combined power generation system according to claim 5, wherein a first flue gas isolation baffle (9) is arranged at an inlet of the underground cave (7), a second flue gas isolation baffle (10) is arranged at a flue gas inlet of the waste heat boiler (3), a third flue gas isolation baffle (14) is arranged at a flue gas inlet of the mixing secondary air box (12), a fourth flue gas isolation baffle (16) is arranged at a flue gas inlet of the mixing burnout air box (13), and an air exhaust fan (8) is arranged in the underground cave (7); the first flue gas isolation baffle (9), the second flue gas isolation baffle (10), the third flue gas isolation baffle (14) and the fourth flue gas isolation baffle (16) are respectively connected with the control system (22).
7. A gas turbine and coal combined power generation system according to claim 6, characterized in that the measured pressures are sent to a control system (22) by a plurality of pressure measuring points (20) in the underground cavern (7), the mixed secondary air box (12) and the mixed burnout air box (13), and the control system calculates the average value of the pressures in the underground cavern (7), the mixed secondary air box (12) and the mixed burnout air box (13); the detected oxygen amount is sent to a control system (22) by a plurality of oxygen amount measuring points (21) at the outlet of the reducing area and the outlet of the hearth of the coal-fired boiler (4), and the control system (22) calculates the average value of the oxygen amount at the outlet of the reducing area and the outlet of the hearth of the coal-fired boiler (4).
8. The gas turbine and coal machine combined power generation system according to claim 7, wherein high-temperature flue gas exhausted by the gas turbine (1) enters the waste heat boiler (3) through the flue gas main pipe (2) and the first flue gas pipeline (5) and enters the underground cave (7) through the flue gas main pipe (2) and the second flue gas pipeline (6); in order to ensure that the combustion engine (1) runs efficiently, the smoke discharge pressure of the combustion engine cannot be higher than the highest allowable smoke discharge pressure corresponding to the load of the combustion engine, when the sum of the average pressure value in the underground cavern (7), the resistance of the smoke discharge main pipe (2) and the resistance of the second smoke discharge pipeline (6) is lower than the highest allowable smoke discharge pressure corresponding to the load of the combustion engine (1), the control system (22) closes the second flue gas isolation baffle (10) and sends high-temperature flue gas discharged by the combustion engine (1) into the underground cavern (7); when the sum of the average pressure value in the underground cave (7), the resistance of the smoke exhaust main pipe (2) and the resistance of the second smoke exhaust pipeline (6) is higher than the highest allowable smoke exhaust pressure corresponding to the load of the combustion engine (1), the control system (22) closes the first flue gas isolation baffle (9), and high-temperature flue gas exhausted by the combustion engine (1) is sent to the waste heat boiler (3);
before the underground cave (7) is put into operation for the first time, an air exhaust fan (8) is used for exhausting all gas in the underground cave (7); when the underground cave (7) runs, the air exhaust fan (8) is in a closed state.
9. The gas turbine and coal machine combined power generation system according to claim 7, wherein the control system (22) closes the third flue gas isolation baffle (14) when the pressure value of the mixed secondary air box (12) corresponding to the load of the coal-fired boiler (4) is higher than the average pressure value of the underground cavern (7), and the control system (22) opens the third flue gas isolation baffle (14) when the pressure value of the mixed secondary air box (12) corresponding to the load of the coal-fired boiler (4) is lower than the average pressure value of the underground cavern (7);
when the third flue gas isolation baffle (14) is in an open state, the control system (22) controls the opening degree of the first flue gas adjusting baffle (15) so that the average value of the oxygen quantity at the reducing area outlet of the coal-fired boiler (4) reaches the oxygen quantity value at the reducing area outlet corresponding to the load of the coal-fired boiler (4), if the first flue gas adjusting baffle (15) is fully opened, the average value of the oxygen quantity at the reducing area outlet of the coal-fired boiler (4) still does not reach the oxygen quantity value at the reducing area outlet corresponding to the load of the coal-fired boiler (4), and the control system (22) controls the opening degree of the second air quantity adjusting baffle (18) so that the average value of the oxygen quantity at the reducing area outlet of the coal-fired boiler (4) reaches the oxygen quantity value at the reducing area outlet corresponding to the load of the coal-fired boiler (4);
when the third flue gas isolation baffle (14) is in a closed state, the control system (22) controls the opening degree of the secondary air quantity adjusting baffle (18) so that the average value of the oxygen quantity at the outlet of the reduction area of the coal-fired boiler (4) reaches the oxygen quantity value at the outlet of the reduction area corresponding to the load of the coal-fired boiler (4);
when the pressure value of the mixed burnout air box (13) corresponding to the load of the coal-fired boiler (4) is higher than the average pressure value of the underground cave (7), the control system (22) closes the fourth flue gas isolation baffle (16), and when the pressure value of the mixed burnout air box (13) corresponding to the load of the coal-fired boiler (4) is smaller than the average pressure value of the underground cave (7), the control system (22) opens the fourth flue gas isolation baffle (16).
10. The gas-fired coal machine combined power generation system according to claim 9, wherein when the fourth flue gas isolation baffle (16) is in an open state, the control system (22) controls the opening degree of the second flue gas adjustment baffle (17) so that the average oxygen amount of the hearth outlet of the coal-fired boiler (4) reaches the hearth outlet oxygen amount value corresponding to the load of the coal-fired boiler (4), if the second flue gas adjustment baffle (17) is fully opened, the average oxygen amount of the hearth outlet of the coal-fired boiler (4) still does not reach the hearth outlet oxygen amount value corresponding to the load of the coal-fired boiler (4), and the control system (22) controls the opening degree of the over-fired air amount adjustment baffle (19) so that the average oxygen amount of the hearth outlet of the coal-fired boiler (4) reaches the hearth outlet oxygen amount value corresponding to the load of the coal-fired boiler (4);
when the fourth flue gas isolation baffle (16) is in a closed state, the control system (22) controls the opening degree of the burnout air quantity adjusting baffle (19) so that the average oxygen quantity value of the hearth outlet of the coal-fired boiler (4) reaches the hearth outlet oxygen quantity value corresponding to the load of the coal-fired boiler (4);
the average pressure value of the mixed secondary air box (12) and the mixed burnout air box (13) on the coal-fired boiler (4) needs to be maintained at the pressure corresponding to the load of the coal-fired boiler (4), and the pressure is further controlled by the opening degree of a burner air door on the mixed secondary air box (12) and the opening degree of a burner air door on the mixed burnout air box (13).
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CN111623369A (en) * 2020-06-28 2020-09-04 华电潍坊发电有限公司 Control method for adjusting boiler fuel feeding quantity by using smoke oxygen content signal

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JPH048804A (en) * 1990-04-26 1992-01-13 Mitsubishi Heavy Ind Ltd Combustion method for exhaust gas recombustion boiler
CN106988884A (en) * 2017-03-24 2017-07-28 新奥科技发展有限公司 Electricity-generating method and electricity generation system
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