A device and method for removing dust accumulation at the cold end of an air preheater after the scr system is put into operation
A technology of air preheater and SCR system, which is applied in combustion methods, removal of solid residue, lighting and heating equipment, etc. and other problems, to achieve the effect of high safety, small investment and good effect
Active Publication Date: 2019-01-15
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +1
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Problems solved by technology
Steam soot blowing can effectively remove ash deposits when the unit does not use a denitrification system, but has little effect on ash deposits mixed with ammonium bisulfate; high-pressure water flushing technology can effectively remove ash deposits mixed with ammonium bisulfate, but If the pressure is too high, generally 30MPa, the operation is dangerous, and it will have a large impact on the steel plate of the air preheater, which will easily cause deformation and affect the normal use of the air preheater
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[0025] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0026] Such as figure 1 As shown, 1 is the high-temperature flue at the inlet of the air preheater, 2 is the main body of the air preheater, 3 is the outlet flue of the air preheater, 4 is the valve on the external pipe 6, and 5 is the booster fan. Part of the high-temperature flue gas extracted from the inlet of the air preheater or other areas is sent to the flue gas side of the cold end of the air preheater through the external pipe 6, and multi-channel air supply should be used to avoid the impact of excessive expansion of local parts of the cold end of the air preheater To be safe, the multi-channel air inlet should be slanted downward by 10°-30° to avoid dust accumulation, and there is a valve on the external pipe to adjust the flow of flue gas. When conditions permit, a booster fan 5 can be added to the external pipe 6 to increase the velocity o...
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The invention discloses a device and a method for clearing ash deposits at a cold end of an air preheater after putting a SCR system into operation, wherein the device comprises a high-temperature flue arranged at an inlet of the air preheater and a gas exhaust flue arranged at an outlet of the air preheater; an external pipeline is arranged between the inlet of the air preheater and a flue gas side of the cold end of the air preheater; a pipeline valve for controlling flow of flue gas which passes through the external pipeline is arranged on the external pipeline; and the external pipeline is a multi-channel air feeding structure, and an air inlet of the external pipeline has a taper. According to the device disclosed by the invention, high-temperature flue gas is introduced into the cold end of the air preheater, so that a temperature of a cold-end area is increased to be 200 DEG C or higher, and bonded fly ash is expanded and loosened; and meanwhile, a steam ash-blowing device of the air preheater is utilized for blowing off fluffy ash deposits. The device has the advantages of being less in modification, small in investment, good in fly ash removal effect and small in damage on equipment.
Description
technical field [0001] The invention relates to a device and method for removing dust accumulation at the cold end of an air preheater after the SCR system is put into operation. Background technique [0002] The air preheater is an important auxiliary equipment in a thermal power plant. It is a flue gas-air heat exchange device that efficiently utilizes the waste heat after combustion. The cold air absorbs the heat of high-temperature flue gas in the air preheater and the temperature rises, thereby strengthening the fuel. Catches fire and burns. [0003] With the country's strict requirements on the emission concentration of nitrogen oxides from coal-fired units in thermal power plants, coal-fired power plants must install denitrification systems to meet the standard emission requirements. Most power plants use SCR reactors installed upstream of the air preheater to reduce NOx to N 2 , where the excess ammonia enters the air preheater along with the flue gas. In the low t...
Claims
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IPC IPC(8): F23J3/00
CPCF23J3/00F23J2700/001
Inventor 崔福兴杨兴森刘福国王海超董信光刘景龙刘科
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY