Rotation type air preheating system capable of achieving online cleaning and online cleaning method

Abstract

The invention discloses a rotation type air preheating system capable of achieving online cleaning and an online cleaning method. The rotation type air preheating system comprises a rotation air preheater, a nozzle, a linear moving device and a flow shielding plate. The linear moving device is arranged at the smoke outlet end of a smoke channel of the rotation type air preheating system, the nozzle is arranged on the linear moving device, the nozzle is arranged towards the rotation air preheater, and the nozzle is connected with a hot primary air mother pipe through an air pipe. Hot primary air is guided out of the hot primary air mother pipe and sprayed towards a heat accumulation element of the rotation air preheater through the nozzle, and the flow shielding plate is arranged at the smoke inlet end of the smoke channel, corresponds to the motion area of the nozzle and is used for shielding smoke in the corresponding area from entering the rotation air preheater. By means of the rotation type air preheating system capable of achieving online cleaning and the online cleaning method, a cold end heat accumulation element of the rotation type air preheating system can be cleaned online, and the cleaning effect is better.

Description

technical field [0001] The invention relates to a rotary air preheating system that can be cleaned online, and also relates to an online cleaning method for the system. Background technique [0002] In the boiler system of the coal-fired power generation unit in the thermal power industry, in order to improve the heat utilization rate of the high-temperature flue gas generated by the combustion of coal in the boiler, a rotary air preheating system is installed, and the rotary air preheating system in the rotary air preheating system The air preheater heats the air entering the furnace to improve the efficiency of the boiler. [0003] At present, after the implementation of ultra-low emission standards in thermal power plants, out-of-stock catalyst devices are installed at the front end of the rotary air preheater of coal-fired boilers. After the NH4 gas reducing agent is injected into the flue gas at the tail of the boiler and fully mixed with the NOx gas in it, when passin...

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Problems solved by technology

[0005] 1) After the high-pressure steam enters the heat storage element at the cold end, there is a sharp drop in pressure, causing the temperature of the steam to drop rapidly and approach the temperature of the flue gas in the area of ​​the heat storage element, and cannot form a heating effect on the ammonium bisulfate

[0006] 2) When steam purging is used, due to the high value of steam heat, if a nozzle with a larger area is used for purging, it will cause a sharp increase in the amount of purging steam and greatly reduce the economy of the unit, so only small diameter nozzles can be used. Nozzles for blowing that do not cover the entire cold end heat storage element

The high-velocity purge steam cannot penetrate the non-straight-through channel in the instantaneous purge, and cannot achieve a good penetration ability, so it cannot effectively clean the heat storage element

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