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Gas turbine and coal machine combined power generation system and method

A combined power generation, gas-fired and coal-fired machine technology, applied in the direction of combined combustion mitigation, machines/engines, mechanical equipment, etc., can solve the problems of lower efficiency than coal-fired boilers, small capacity of waste heat boilers, low operating parameters, etc., and achieve high efficiency , reduced exhaust loss, and improved low-load operating capacity

Active Publication Date: 2021-08-10
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high exhaust gas temperature of the gas turbine, which is often above 600°C, its stand-alone efficiency is relatively low. Generally, it is equipped with waste heat boilers and other equipment to form a combined cycle unit. However, due to the small capacity and low operating parameters of the waste heat boiler, its efficiency Far worse than coal-fired boilers

Method used

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  • Gas turbine and coal machine combined power generation system and method
  • Gas turbine and coal machine combined power generation system and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Please refer to the attached figure 1 It is a flow chart of a combined power generation method of a gas-fired coal-fired engine in a specific embodiment of the present invention, including the following steps:

[0047]Step 1: Determine 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 maximum allowable exhaust pressure corresponding to the gas turbine load. If it is satisfied, then perform step 2; if not, perform step 3;

[0048] Step 2: Send the high-temperature flue gas discharged from the gas turbine into the underground cave;

[0049] Step 3: Send the high-temperature flue gas discharged from the gas turbine to the waste heat boiler;

[0050] Step 4: Send the high-temperature flue gas from the underground cave into the mixed secondary air box of the coal-fired boiler, mix with the secondary air in the mixed secondary air box to replace part of the low-temperature se...

Embodiment 2

[0058] Please refer to the attached figure 2 It is a structural schematic diagram of a coal-fired turbine combined power generation system of the present invention. The system includes: a gas turbine 1 , a waste heat boiler 3 , a coal-fired boiler 4 , an underground cave 7 and a control system 22 .

[0059] The gas turbine 1 is connected to the waste heat boiler 3 through the main exhaust pipe 2 and the first exhaust pipe 5, and is connected to the underground cave 7 through the main exhaust pipe 2 and the second exhaust pipe 6. Isolation baffle 10, the entrance of underground cave 5 is provided with first fume isolation baffle 9. Underground cavern 7 is provided with exhaust blower 8.

[0060] The coal-fired boiler 4 is provided with a mixed secondary air box 12 and a mixed burnout air box 13 .

[0061] The underground cave 7 is connected to the mixing secondary air box 12 and the mixing burnout air box 13 through the flue gas pipeline 11, and the flue gas entrance of the...

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Abstract

The invention discloses a gas turbine and coal machine combined power generation system and method. At present, one factor that the efficiency of a coal-fired boiler is difficult to further improve is that the air inlet temperature of the boiler is lower, and the efficiency of gas turbine combined cycle is also difficult to further improve due to the lower efficiency of a waste heat boiler and a steam turbine. According to the technical scheme, high-temperature flue gas exhausted by a gas turbine is fed into an underground cave or the waste heat boiler according to the highest allowable exhaust pressure corresponding to the load of the gas turbine, and the high-temperature flue gas in the underground cave is fed into the coal-fired boiler according to the actual operation condition of the coal-fired boiler to replace part of low-temperature boiler inlet air. According to the gas turbine and coal machine combined power generation system and the method, after the high-temperature flue gas exhausted by the gas turbine partially replaces original low-temperature secondary air and over fire air, the efficiency and the low-load operation performance of the coal-fired boiler can be effectively improved, and meanwhile the utilization efficiency of flue gas exhaust waste heat of the gas turbine can also be effectively improved.

Description

technical field [0001] The invention belongs to the field of generating sets, in particular to a combined power generation system and method of a combustion engine and a coal engine. Background technique [0002] In recent years, coal-fired power generation is still the most important part of my country's power supply. With the continuous attention of coal-fired power generation enterprises to energy conservation and emission reduction, effectively reducing the coal consumption of unit power generation has become an important work content of coal-fired power generation enterprises. Effectively reducing irreversible losses such as combustion and heat transfer in pulverized coal combustion in coal-fired boilers is undoubtedly an important direction for reducing coal consumption for power generation in the future. One of the important factors that cause large irreversible losses such as combustion and heat transfer in the combustion of pulverized coal is the low temperature of t...

Claims

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Application Information

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IPC IPC(8): F01K23/10F01K13/00F01K11/02F01K21/00
CPCF01K23/10F01K13/00F01K11/02F01K21/00Y02E20/16
Inventor 童家麟刘文胜徐小琼孙五一孙洁郑建平
Owner ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY