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Treatment method and device for blocking of air preheater of coal-fired utility boiler

An air preheater, coal-fired power station technology, applied in the combustion method, combustion air/fuel supply, non-flammable liquid/gas transportation, etc. Increase the resistance of the air preheater to reduce the tendency of fouling and scaling, reduce particles with high silicon content, and reduce agglomerated particles

Inactive Publication Date: 2016-12-14
GUODIAN SCI & TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ammonium bisulfate is a highly viscous and highly corrosive substance. The viscosity of ammonium bisulfate causes a large amount of fly ash to deposit on the surface of the air preheater, causing the air preheater to be blocked, increasing the resistance of the air preheater, and increasing The power consumption of the induced draft fan may even force the unit to shut down to clean the air preheater in severe cases. Actual operating experience shows that ammonium bisulfate is the main factor for the corrosion and blockage of the air preheater after the SCR is put into operation, resulting in the resistance of the air preheater increase, even crisis unit safe operation

Method used

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  • Treatment method and device for blocking of air preheater of coal-fired utility boiler

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] like figure 1 The device shown is used to control the blockage of the air preheater of the coal-fired power plant boiler, and is connected to the boiler tail flue 9, including the mixing box 1, the water pump 2, the filter 3, the air compression pump 4, the blower 5, the heater 6, The evaporator 7 and the ash hopper 8; the air compression pump 4 is connected to the top of the side wall of the evaporator 7 through the compressed air nozzle, the stirring box 1 is communicated with the compressed air nozzle through a pipeline, and the mixing box 1 and the compressed air nozzle are provided in the middle Water pump 2 and filter 3, agitator 1 are also provided with three pipelines 10, 11, 12 for adding fly ash, process water and alkaline substances; described blower 5 communicates with evaporator 7 top through heater 6, evaporates The lower part of the side wall of the device 7 communicates with the boiler tail flue 9 through a connecting pipe, and the bottom of the evaporat...

Embodiment 2

[0037] The fly ash collected by the dust collector is added to the stirring tank according to the liquid-solid ratio of 4:1 and stirred to form a slurry. The stirring tank is equipped with heat preservation measures and electric heating devices to control the temperature of the slurry between 40-50°C; after the slurry is stable, add hydrogen Sodium oxide adjusts slurry pH to 13;

[0038] The evaporator is arranged vertically, the hot air flows from top to bottom, and flows out from the side outlet of the lower part, and a dust hopper is set at the bottom;

[0039] The air is pressurized by the blower and enters the heater. After heating, it is sprayed into the tail flue of the boiler through the evaporator to form a stable air flow, and the temperature of the gas in the evaporator is controlled between 240-250°C;

[0040] The alkaline slurry is pumped through the filter and then sent to the compressed air atomizing nozzle. The compressed air pressure is 0.04Mpa. After evaporat...

Embodiment 3

[0043] The fly ash collected by the dust collector is added to the stirring tank according to the liquid-solid ratio of 10:1 and stirred to make a slurry. The stirring tank is equipped with heat preservation measures and electric heating devices to control the temperature of the slurry between 30-40°C; after the slurry is stable, add carbonic acid Sodium to adjust the slurry pH to 8;

[0044] The evaporator is arranged vertically, the hot air flows from top to bottom, and flows out from the side outlet of the lower part, and a dust hopper is set at the bottom;

[0045] After desulfurization, the clean flue gas is condensed and dewatered, and then led to the heater by a fan. After heating, it is sprayed into the tail flue of the boiler through the evaporator to form a stable air flow, and the gas temperature in the evaporator is controlled between 260-280 °C;

[0046] The alkaline slurry is pumped through the filter and then sent to the compressed air atomizing nozzle. The comp...

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Abstract

The invention discloses a treatment method and device for blocking of an air preheater of a coal-fired utility boiler. The concentration of SO3 in a flue is decreased through increasing the ratio of fly ash in flue gas in the flue at the tail part of the boiler to SO3, and improving the alkalinity of fly ash. The treatment method comprises the steps of S1, mixing and stirring fly as collected by a dust collector of a power station and process water into slurry; S2, adding an alkaline substance into the slurry to obtain alkaline slurry; S3, spraying the alkaline slurry into an evaporator, and evaporating liquor in the alkaline slurry, so as to form blended alkaline fly ash; and S4, feeding the alkaline fly ash into the flue at the tail part of the boiler to be mixed with flue gas in the flue. The device communicates with the flue at the tail part of the boiler, and comprises a stirring tank, a water pump, a filter, an air compression pump, an air blower, a heater, the evaporator and an ash deposition hopper. According to the treatment method and the device, the concentration of SO3 in the flue can be decreased, the tendencies of ash deposition and scaling of the air preheater are reduced, and the blocking problem of the air preheater is effectively solved.

Description

technical field [0001] The invention relates to a method and a device for treating blockage of an air preheater of a coal-fired power plant boiler. Background technique [0002] During the combustion operation of coal-fired power plant boilers, there will be a small amount of SO 3 Formation, the amount of sulfur contained in coal determines the SO 3 The content of SO in low-sulfur coal is different 3 It can be in the order of very few ppm, and high-sulfur coal can make SO 3 Reach 30 ~ 40ppm or even higher. With the increasingly stringent environmental protection standards, coal-fired power plant boilers are equipped with selective catalytic reduction (SCR) flue gas denitrification, dust removal (electrostatic precipitator / bag filter), wet flue gas desulfurization (WFGD) and other pollutant control facilities. NOx, soot, SO produced during coal combustion 2 and other conventional pollutants have been effectively removed, but the catalyst of the SCR denitrification system...

Claims

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Application Information

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IPC IPC(8): F23J15/00F23L15/00
CPCF23J15/003F23J2215/20F23L15/00F23L2900/15043Y02E20/34
Inventor 胡宇峰薛建明李永生陈焱董月红傅静雯
Owner GUODIAN SCI & TECH RES INST
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