Combustion adjustment method for supercritical boiler capable of performing blending combustion of coke oven gas

A supercritical boiler and coke oven gas technology, applied in the direction of combustion methods, combustion control, combustion equipment, etc., can solve problems such as overheating and bursting of pipes on the heating surface, increasing operating costs of denitrification devices, equipment and personal safety accidents, etc. Achieve the effect of reducing the deviation of smoke temperature, suppressing residual rotation, and preventing leakage of explosive tubes

Active Publication Date: 2015-06-17
ELECTRIC POWER SCI RES INST OF GUIZHOU POWER GRID CO LTD
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Problems solved by technology

[0002] The boiler burner of a supercritical unit adopts the wall-type tangential combustion method, and a coke oven gas mixed combustion system device is installed in the secondary air nozzle of each set of burner layers. A total of 12 gas guns are designed, each with an output of 3000 Nm3 /h, the total output is 36000 Nm3/h, calculated according to the coke oven gas calorific value of 17~19MJ/Nm3, it is estimated that 20 tons of standard coal can be saved per hour, and the combustion stability and economy of the boiler are greatly enhanced. It has been put into production, but only the lowest layer of gas guns has been used in the four-layer gas mixed combustion system of the boiler, and the remaining 3 layers of gas guns have never been used. The NO x The concentration is also relatively large (about 500 mg/m 3 ), there is still a certain deviation from the emission standards stipulated by the state, which

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  • Combustion adjustment method for supercritical boiler capable of performing blending combustion of coke oven gas
  • Combustion adjustment method for supercritical boiler capable of performing blending combustion of coke oven gas
  • Combustion adjustment method for supercritical boiler capable of performing blending combustion of coke oven gas

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Embodiment Construction

[0018] Example: such as Figure 1~4 As shown, a combustion adjustment method of a supercritical boiler mixed with coke oven gas includes a supercritical boiler mixed with coke oven gas, the boiler includes a boiler furnace 1, a water wall 2, a secondary damper 3, and Damper 4, gas gun 5, and secondary damper 3 are arranged on four water-cooled wall walls in the furnace of the boiler, including eight floors arranged vertically downward in sequence. The burnout damper 4 is arranged at the four corners of the water-cooled wall above the secondary damper in the furnace. Above, the gas gun 5 includes four layers, which are respectively arranged on the second layer (the AB layer in the figure), the third layer (the BC layer in the figure), and the fifth layer (the DE layer in the figure) of the secondary damper 3 from bottom to top. and the sixth floor (the EF floor in the figure), the combustion adjustment method includes: the second air door 3 of the eighth floor adopts the non-li...

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Abstract

The invention discloses a combustion adjustment method for a supercritical boiler capable of performing blending combustion of coke oven gas. The device comprises a supercritical boiler capable of performing blending combustion of coke oven gas. The combustion adjustment method comprises the following steps: adopting nonlinear normal pagoda type air door air distribution openings by virtue of an eight-layer secondary air door, sequentially reducing the air door opening upwards, allowing the air door opening of a burnout air door at a diagonal part to be smaller than the air door opening at another diagonal part, and feeding two layers of secondary air at least by virtue of a gas gun by adopting a normal pagoda type air distribution mode. The normal pagoda type air door distribution opening of the secondary air door and different air door openings at two diagonal parts of the burnout air door are adopted, and multilayer air is fed by virtue of the gas gun, so that the fume temperature deviation at the hearth outlet can be effectively reduced, and the detonation accidents of the boiler are reduced. Moreover, according to stable combustion in a fuel enriched area on the middle lower part of the hearth and feeding of the gas gun, the NOx generation amount is greatly reduced, the boiler operates in a high-efficiency economic performance area, the comprehensive operating cost is reduced, and the adjustment method is simple.

Description

technical field [0001] The invention relates to a combustion adjustment method of a supercritical boiler mixed with coke oven gas, in particular to the different air distribution adjustment methods of the secondary air and the overburned air of the supercritical boiler and the operation mode of each layer of gas guns, belonging to the four-corner cutting method. Round boiler combustion technology field. Background technique [0002] The boiler burner of a supercritical unit adopts the wall-type tangential combustion method, and a coke oven gas mixed combustion system device is installed in the secondary air nozzle of each set of burner layers. A total of 12 gas guns are designed, each with an output of 3000 Nm3 / h, the total output is 36000 Nm3 / h, calculated according to the coke oven gas calorific value of 17~19MJ / Nm3, it is estimated that 20 tons of standard coal can be saved per hour, and the combustion stability and economy of the boiler are greatly enhanced. It has bee...

Claims

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Application Information

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IPC IPC(8): F22B3/08F23C7/02F23N3/00
Inventor 赵雄陈玉忠石践石航
Owner ELECTRIC POWER SCI RES INST OF GUIZHOU POWER GRID CO LTD
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