Ammonium bisulfate deposition prevention five-chamber rotary preheater and operation method thereof

Abstract

The invention belongs to the technical field of thermal power plant boiler auxiliary equipment and relates to an ammonium bisulfate deposition prevention five-chamber rotary preheater and an operationmethod thereof in order to solve the technical problem that an existing air preheater is blocked by ammonium bisulfate easily. The air preheater is internally provided with an air preheater rotor. Aheat exchange element is arranged on the air preheater rotor. The air preheater internally comprises an exhaust gas side and air sides. The air sides include the air side I, the air side II, the air side II and the air side IV. An inlet of the air side I is connected with an inlet of the exhaust gas side through a pipeline. A high-temperature fan I is arranged between the inlet of the air side I and the inlet of the exhaust gas side. An outlet of the air side IV is connected with an inlet of the air side IV through a pipeline. A high-temperature fan II is arranged between the outlet of the airside IV and the inlet of the air side IV. A steam soot blower is arranged at the cold end of the air side II. An acoustic soot blower is arranged at the cold end of the air side III. Under the full-load working condition, the phenomenon of blockage of the ammonium bisulfate deposition prevention five-chamber rotary preheater can be effectively relieved on line, and the frequency of non-planned shutdown of the air preheater can be reduced.

Description

technical field [0001] The invention belongs to the technical field of boiler auxiliary equipment in thermal power plants, and in particular relates to a five-chamber rotary air preheater for preventing the deposition of ammonium bisulfate. Background technique [0002] According to the standard requirements of GB13223-2011 "Emission Standards of Air Pollutants for Thermal Power Plants", since 2014, the emission of nitrogen oxides from coal-fired boilers for thermal power generation shall be 100mg / m 3 The emission limit value, with the ultra-clean emission transformation, the emission limit value is 50mg / m 3 . In order to meet emission requirements, except for a few circulating fluidized bed coal-fired units, most coal-fired units in China have installed a selective catalytic reduction denitrification device at the outlet of the boiler economizer. Under the action of the catalyst, ammonia gas reduces nitrogen oxides. At the same time as nitrogen and water, part of sulfur d...

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Problems solved by technology

[0008] The purpose of the present invention is to solve the technical problem that the existing air preheater is easily blocked by ammonium bisulfate, and to provide a method to effectively relieve the blockage of the air preheater online and reduce the number of unplanned shutdowns of the air preheater under full load conditions. Anti-ammonium bisulfate deposition anti-five compartment rotary air preheater and its working method

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