Combined SNCR-SCR system used for industrial boiler and having high load adaptability, and SNCR-SCR combination method thereof
An industrial boiler and high-load technology, which is applied in separation methods, chemical instruments and methods, and separation of dispersed particles, to achieve high-efficiency removal, convenient system operation, and improved load adaptability
Active Publication Date: 2013-04-03
TSINGHUA UNIV
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[0005] In order to solve the problem of load adaptability of flue gas denitrification technology, the present invention provides a high load adaptable SNCR and SCR combination system and method for industrial boilers
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[0018] The present invention provides a high-load adaptable SNCR and SCR combination system and method for industrial boilers. The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0019] system connection as figure 1 As shown: the furnace nozzle 3 is installed on the upper part of the furnace 1; the inlet flue of the SCR reactor 6 is connected to the tail of the flue 2, and the SCR nozzle 4 is arranged at the connection; the reducing agent storage tank 5 outside the furnace 1 is connected to the furnace Nozzle 3 and SCR nozzle 4 are connected. The control system is connected with the nozzle 3 in the furnace, the SCR nozzle 4 and the sensors in the boiler to monitor the NO in the flue gas x Concentration changes, and real-time adjustment of reducing agent injection mode and injection volume combined with boiler operating parameters. The nozzle 3 in the furnace is a multi-stage spray gun, and the positi...
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The invention relates to a combined SNCR-SCR system used for an industrial boiler and having high load adaptability, and an SNCR-SCR combination method thereof, and belongs to the technical field of control of atmospheric pollutants discharged from a coal burning boiler. An in-boiler nozzle is arranged at the upper part of a hearth; an inlet flue gas duct of an SCR (Selective Catalytic Reduction) reactor is connected with the tail part of a flue gas duct, and an SCR (Selective Catalytic Reduction) nozzle is arranged at the connected part; and a reducing agent storage tank outside the hearth is connected with the in-boiler nozzle and the SCR (Selective Catalytic Reduction) nozzle. When the load of the boiler ranges from 75 percent to 100 percent, the reducing agent is sprayed only through the SCR (Selective Catalytic Reduction) nozzle, and when the load of the boiler ranges from 40 percent to 75 percent, the reducing agent is sprayed only through the in-boiler nozzle. Through the combination of the in-boiler SNCR (Selective Non Catalytic Reduction) denitrification process and the tail end SCR (Selective Catalytic Reduction) denitrification process, the purpose of effectively removing the NOx in the flue gas is achieved, and the load adaptability of the whole denitrification system is enhanced.
Description
technical field [0001] The invention belongs to the technical field of controlling air pollutants discharged from coal-fired boilers, and in particular relates to a high-load adaptable SNCR and SCR combined system and method for industrial boilers. Background technique [0002] my country's energy structure is dominated by coal, and the main way of using coal is combustion. The flue gas emitted by coal-fired boilers contains SO 2 , NO X Atmospheric pollutants such as dust and particulate matter have caused serious pollution to my country's atmospheric environment. my country's SO for power plant boilers and industrial boilers 2 , NO X and particulate matter emissions, corresponding emission standards have been issued, and the focus of control during the "Tenth Five-Year Plan" to the "Eleventh Five-Year Plan" period is SO 2 By 2009, the installed capacity of desulfurization devices in coal-fired power stations will reach 470GW, and the technology adopted is mainly wet de...
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Login to View More IPC IPC(8): B01D53/75B01D53/56
Inventor 宋蔷姚强吴兴远
Owner TSINGHUA UNIV