System and method for cleaning rotary air preheater using dry ice pellets
An air preheater and rotary technology, which is applied in the field of electric power industry, can solve the problems of damage to heat storage fins, difficult treatment of waste water, and increased treatment costs
Active Publication Date: 2020-07-07
山西昌德大成科技有限公司
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Problems solved by technology
The disadvantage is that if the installation is improper, the high-pressure water flow is not perpendicular to the heat exchange element, and the high-pressure water flow cannot penetrate the entire heat exchange surface of the air preheater, which not only does not have the flushing effect, but also damages the heat storage sheet, and the waste water after flushing is difficult to treat , adding additional processing fees
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[0031] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0032] see Figure 1-4, a system for cleaning a rotary air preheater with dry ice particles, including DCS1, a controller 2, a differential pressure transmitter 3 for detecting the pressure difference at the inlet and outlet of the air preheater 100, an air compressor 5, an air filter 6, The nozzle assembly 9 and the liquid carbon dioxide storage tank 7 and the dry ice granulator 8 connected by the pipeline; the nozzle assembly 9 is arranged at the air side inlet of the air preheater 100; the nozzle assembly 9 includes a horizontal guide rail 91 and an installation guide rail 91 The air pipe 92 on the top, some nozzles 93 axially fixed on the air pipe 92 and the dry ice particle pipe 94 sleeved in the air pipe 92, the nozzle 93 is provided with a central nozzle 931 and an annular nozzle 932 surrounding the central nozzle 931 , the central no...
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The invention relates to a system for cleaning a rotary air preheater through dry ice particles and a using method of the system. The system for cleaning the rotary air preheater through the dry ice particles comprises a DCS, a controller, a differential pressure transmitter for detecting the differential pressure at an in-out opening of the air preheater, an air compressor, an air filter, a spraypipe assembly, a liquid carbon dioxide storage tank and a dry ice pelletizer, wherein the liquid carbon dioxide storage tank and the dry ice pelletizer communicate through a pipeline. The spray pipeassembly is arranged at an air side inlet of the air preheater. On-line clearing of accumulated scale between heat storage plates of the air preheater can be achieved, the blocking situation inside the air preheater can be sensed and judged, the heat storage plates of the rotary air preheater are cleaned stage by stage in the mode that nozzles are driven by a guide rail to move, after the accumulated scale of the air preheater is cleared on line by the dry ice particles, the dry ice particles are sublimated into gas, and secondary pollution to the environment is avoided.
Description
technical field [0001] The invention relates to a system for cleaning a rotary air preheater by using dry ice particles and an application method thereof, belonging to the field of electric power industry. Background technique [0002] At present, most domestic coal-fired power plant boilers use Selective Catalytic Reduction (SCR) flue gas denitrification system. During the operation of SCR, the amount of ammonia escape increases due to the decrease of catalyst efficiency or simply increasing the ratio of ammonia to nitrogen to improve the denitrification efficiency. Escaping ammonia and SO in flue gas 3 and H 2 O will generate (NH 4 ) 2 SO 4 (small amount) and NH 4 HSO 4 . NH 4 HSO 4 The liquefaction temperature and solidification temperature are 350 and 147°C, respectively, and the liquid / solid NH 4 HSO 4 With strong cohesiveness, it will adhere to the surface of the heat storage plate of the air preheater and absorb fly ash particles. If it accumulates for a l...
Claims
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IPC IPC(8): B08B7/00
CPCB08B7/0021
Inventor 吴天顺白涛
Owner 山西昌德大成科技有限公司