Pulverized coal flame preheating reburning system

Abstract

A pulverized coal flame preheating reburning system comprises a main boiler burner and a reburning device. A plurality of sets of primary air pipes are arranged at the front end of a preheating chamber of the reburning device, an injection port communicated with a reburning area of the main boiler burner is arranged at the rear end of the preheating chamber of the reburning device, the primary air pipes comprise inner primary air pipes and outer primary air pipes, and inlets of the inner primary air pipes are communicated with a pulverized coal feeding device; the inlet of a gas burner preheating chamber is provided with an ignition detection electrode and a gas burner air-supporting pipeline, and a gas pipeline with a gas burner gas spray head is arranged in the gas burner preheating chamber. The amount of gas needed for the system accounts for 0.3-0.5% of total boiler heat input, gas burns in the preheating chamber of the reburning device, formed naked light is used for providing a stable ignition source, and heat in the preheating chamber of the reburning device is provided by volatile matter generated through pyrolysis of pulverized coal, namely heat is provided by the pulverized coal feeding device. Meanwhile, O2 in primary air for conveying the pulverized coal can be completely consumed away, and nitrogen-containing compounds generated by the pulverized coal which is heated and pyrolyzed can be effectively reduced to N2 under the strong reducing atmosphere.

Description

technical field [0001] The invention belongs to the technical field of furnace combustion out-of-stock technology in the technical field of thermal energy and power engineering, and specifically relates to a method for reducing NO in a pulverized coal furnace. x The discharged pulverized coal flame preheats the reburning system. Background technique [0002] NO x It is the main culprit of photochemical smog and acid rain, and also one of the culprits of large-scale smog in my country in recent years. With the increasingly serious environmental problems such as air pollution, the country is forced to formulate increasingly stringent pollutant discharge standards. The latest "Emission Standard of Air Pollutants for Thermal Power Plants GB13223-2011" requires that coal-fired boilers NO x Emission less than 100mg / m 3 . Therefore thermal power enterprises must control NO x emissions to meet national mandatory requirements. Thermal power out-of-stock technology is divided i...

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Problems solved by technology

Due to the difficulty in preparing ultra-fine coal powder, and relatively high operating and investment costs, this technology has not been widely promoted at present

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