An Intelligent On-Line Flushing System to Solve the Dust Blocking of Air Preheater
A technology of air preheater and flushing system, which is applied in the direction of flushing, cleaning heat transfer devices, lighting and heating equipment, etc. It can solve the problems of affecting production efficiency, the flushing range of the flushing device is limited by height, and the flushing process is frequently shut down. Achieve the effects of reduced energy consumption, improved flushing efficiency, and reduced exhaust loss
Active Publication Date: 2017-03-15
HUNAN DATANG XIANYI TECH CO LTD +1
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Problems solved by technology
[0008] The purpose of the present invention is to provide an intelligent online flushing system for removing the clogged dust of the air preheater, so as to solve the technical problems that the flushing range of the flushing device is limited by the height, and the frequent shutdown of the flushing process affects the production efficiency
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Embodiment 1
[0059] When the operating pressure difference on the flue gas side of the air preheater reaches 1.2-1.3 times the design pressure, the flushing device is manually activated through the upper computer system and the electric control cabinet, and the driving motor of the flushing device drives the flushing gun barrel to extend to the air preheater The distance between the nozzle of the flushing nozzle and the surface to be flushed is 200mm, aiming at the air preheater partition for flushing, the pressure of the water flow at the flushing nozzle is 70Mpa, and the water volume is 60L / min.
[0060] The 1# furnace and 2# furnace of a power plant are 350MW subcritical coal-fired boilers, and the air preheater is a rotary type. The effect of flushing is shown in the table below:
[0061]
[0062] From the data in the above table, before flushing, the pressure difference on the flue gas side of the A side of the 1# furnace and the B side of the 2# furnace is relatively high, and the...
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The invention provides a method solving air preheater dust clogging problems and an intelligent online flushing system; a washing device of the system penetrates a flue gas wall on a flue gas side of the air preheater; a washing gun of the washing device is arranged on a flue gas exit side of the rotary air preheater, i.e., on the bottom of the air preheater, and a nozzle faces upwards; when a heat storage element of the rotary air preheater on a heat-engine plant coal dust boiler flue path is blocked, and import and export operation differential pressure on the glue gas side reaches 1.2-1.3 times of a designed pressure, the high pressure washing system is started, high pressure water is sprayed out from the nozzle of the washing gun of the washing device, and high pressure jet is sprayed out to wash the heat storage element from the bottom of rotating air preheater to an upper side. The high pressure small flow washing mode can fast wash off the ash deposit from the air preheater, thus greatly reducing ventilation resistance of a flue gas heat exchanger, reducing air leak rate, improving heat exchange efficiency of the air preheater, and greatly reducing boiler energy consumption.
Description
technical field [0001] The invention relates to the technical field of dust washing equipment, in particular to an intelligent online washing system for solving the problem of dust blocking in an air preheater. Background technique [0002] The air pre-heater is a heating surface that preheats the air before entering the boiler to a certain temperature through the internal cooling fins, which is used to improve the heat exchange performance of the boiler and reduce energy consumption. Usually, the air preheater of the boiler used for power generation in the power plant is located at the tail of the boiler (where the flue gas and metal temperature are the lowest), and the heat transfer element of the air preheater is usually severely clogged with dust. This could be due to fouling from the acid, or a condition where the cold end of the air preheater is too close to the water dew point, caused by dew point condensation. Modification of selective catalytic reduction conversion...
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IPC IPC(8): F28G9/00
Inventor 聂勤俭王银河李启云尹晓峰
Owner HUNAN DATANG XIANYI TECH CO LTD