Method for reducing ammonia escaping rate of flume denitration outlet

A technology for ammonia escape rate and flue gas, applied in separation methods, chemical instruments and methods, air quality improvement, etc., can solve problems such as downstream rotary preheater blockage, lower denitrification efficiency, and atmospheric secondary pollution, etc., and achieve reduction Improvement costs and operating costs, reduce complexity, and avoid secondary pollution

Inactive Publication Date: 2006-06-21
徐海涛 +2
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Problems solved by technology

However, due to the limitations of various conditions such as reaction conditions, contact time, and control accuracy, there will always be more or less ammonia that escapes without reaction.
This part of ammonia reacts with sulfur trioxide in the flue gas to form NH 4 HSO 4 , resulting in aggravated blockage, corrosion and dust accumulation of the downstream rotary preheater, and even affecting the normal operation of t

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  • Method for reducing ammonia escaping rate of flume denitration outlet
  • Method for reducing ammonia escaping rate of flume denitration outlet

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Embodiment Construction

[0009] The present invention will be further described below in conjunction with accompanying drawing and example.

[0010] Examples of the present invention are figure 1 , the flue gas produced after the combustion of boiler 1 passes through the ammonia injection point 2 of the SNCR method, the boiler economizer 3, the ammonia injection point 4 of the SCR method, the SCR reactor 5, and the molecular sieve reactor 7, then passes through the air preheater 8, and then enters In the next step, the flue gas treatment facilities such as electrostatic precipitator and flue gas desulfurization device are discharged into the atmosphere through the chimney. Among them, SNCR method ammonia injection point 2, SCR method ammonia injection point 4, SCR reactor 5, and catalyst bed 6 are optional. When using SNCR denitrification process, there is only SNCR method ammonia injection point 2; when using SCR denitrification process, only SCR ammonia injection point 4, SCR reactor 5 and catalyst...

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Abstract

The method of lowering the escapement rate of ammonia in the outlet of fume denitrator is to perform secondary treatment of denitrated fume before it enters to the air preheater. One molecular sieve reactor is set before the air preheater to eliminate unreacted ammonia completely or partially to lower the escapement rate of ammonia. The molecular sieve reactor is filled with elite, active carbon or artificially synthesized molecular sieve, and the molecular sieve has homogeneous pore size in 2.8-3.8 angstrom. The apparatus of the present invention can well control the escapement rate of ammonia, reduce the influence on the downstream apparatus, avoid secondary pollution, simplify the ammonia spaying set and its control system, and lower investment cost and running cost.

Description

technical field [0001] The invention relates to a process method and a device for reducing the escape rate of outlet ammonia in flue gas denitrification devices of coal-fired boilers, garbage incineration devices, diesel engines, gas turbines and other similar systems, and belongs to the technical field of environmental protection equipment. Background technique [0002] Nitrogen oxides in the exhaust exhaust of coal-fired boilers and similar devices are one of the main pollutants in the atmosphere. At present, the main control methods are selective non-catalytic reduction (SNCR), selective catalytic reduction (SCR) and SNCR / SCR combined process . The common point of these methods is that ammonia or urea is used as a reducing agent to react with nitrogen oxides in flue gas under the action of high temperature (SNCR process) or catalyst (SCR process) to generate harmless nitrogen and water discharge system. . In order to achieve the expected denitrification efficiency, vari...

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Application Information

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IPC IPC(8): B01D53/56B01D53/84
CPCY02A50/20
Inventor 徐海涛
Owner 徐海涛
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