Coal-fired power plant air preheater blockage prevention system and method
A technology for air preheaters and coal-fired power plants, applied in combustion methods, damage protection, heat exchange equipment, etc., can solve problems such as low-temperature corrosion and clogging of air preheaters, reduce resistance, increase exhaust gas temperature, and improve cooling The effect of end temperature
Pending Publication Date: 2020-02-14
HUADIAN ELECTRIC POWER SCI INST CO LTD
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Problems solved by technology
[0005] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art, and provide a system and method for preventing the blockage of the air preheater in a coal-fired power plant, using a flue gas baffle, a primary air bypass system and a secondary air bypass System and other comprehensive means, coordinately adjust the flue gas volume entering the air preheater and the primary and secondary air volumes, efficiently increase the comprehensive temperature of the cold end of the air preheater, and effectively solve the problem of low-temperature corrosion and blockage of the air preheater
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[0018] The present invention will be further described in detail below in conjunction with the accompanying drawings and examples. The following examples are explanations of the present invention and the present invention is not limited to the following examples.
[0019] see figure 1 , the system for preventing air preheater blockage in coal-fired power plants in this embodiment includes furnace 1, A air preheater 4 and B air preheater 3, and also includes a flue gas system, a primary air system and a secondary air system. The gas system includes the air preheater entrance main flue 2, A flue gas baffle 6, B flue gas baffle 7, A air preheater inlet sub-flue 8, air preheater entrance sub-flue B 9 and air preheater outlet Total flue 10; primary air system includes primary air main pipe 11, A primary air channel 51, A cold primary air branch 54, B primary air channel 31 and B cold primary air branch 34; secondary air system includes A secondary air Road 5, A secondary air bypas...
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The invention discloses a coal-fired power plant air preheater blockage prevention system and method. The system comprises a flue gas system, a primary air system and a secondary air system. The fluegas system comprises an air preheater inlet main flue, a flue gas baffle A, a flue gas baffle B, an air preheater inlet branch flue A, an air preheater inlet branch flue B and an air preheater outletmain flue. The primary air system comprises a primary air mother tube, a primary air duct A, a cold primary air branch tube A, a primary air duct B and a cold primary air branch tube B. The secondaryair system comprises a secondary air duct A, a secondary air bypass mother tube A, a secondary air bypass shunt pipeline A, a secondary air bypass branch tube A, a secondary air duct B, a secondary air bypass mother tube B, a secondary air bypass shunt pipeline B and a secondary air bypass branch tube B. Through the comprehensive means of the flue gas baffles, a primary air bypass system, a secondary air bypass system and the like, the volumes of flue gas and the primary and secondary air going into an air preheater are collaboratively adjusted, the synthetic temperature of the cold end of theair preheater is raised, and the problem of low-temperature corrosion and blockage of an existing air preheater is solved.
Description
technical field [0001] The invention relates to a system and method for preventing blockage of an air preheater in a coal-fired power plant. Background technique [0002] After the installation of the SCR system, the problem of air preheater clogging is very common. Air preheater clogging and pressure difference increase affect the safe and economical operation of the unit. The main reason is that the ammonia escaped from the denitrification system condenses acid in the cold end of the air preheater and the flue gas to form ammonium bisulfate, and the deposition of ammonium bisulfate further aggravates the dust accumulation in the air preheater. Low-temperature acid condensation occurs, reducing the rate of ammonium bisulfate formation, deposition and air preheater blockage. [0003] The comprehensive temperature at the cold end of the air preheater is the sum of the flue gas outlet temperature and the air inlet temperature. The current method of increasing the comprehensiv...
Claims
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Login to View More IPC IPC(8): F23L15/04F28F19/00
CPCF23L15/04F28F19/00Y02E20/34
Inventor 王帅王凯路昆颜喜
Owner HUADIAN ELECTRIC POWER SCI INST CO LTD