An SNCR denitration process and SNCR denitration equipment suitable for rotary kiln-grate pellet flue gas

A technology of grate pelletizing and rotary kiln, which is applied to the separation of dispersed particles, chemical instruments and methods, and separation methods. It can solve the problems of easy hardening of urea stacks, difficult control, and high safety requirements, and achieve low investment and operation costs. , the best SNCR denitrification efficiency, the effect of simple equipment

Pending Publication Date: 2018-04-10
CHINA CITY ENVIRONMENT PROTECTION ENGINEERING LIMITED COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The commonly used reducing agents in SNCR are liquid ammonia, ammonia water and urea. Liquid ammonia has the highest denitrification efficiency, but liquid ammonia is dangerous and has the risk of explosion. It must be transported and stored in a pressure vessel, which requires a license and has high safety requirements; ammonia water It is not a dangerous product, it is relatively safe, the ammonia water system has less equipment, and the control is simple, but the denitrification effi

Method used

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  • An SNCR denitration process and SNCR denitration equipment suitable for rotary kiln-grate pellet flue gas
  • An SNCR denitration process and SNCR denitration equipment suitable for rotary kiln-grate pellet flue gas
  • An SNCR denitration process and SNCR denitration equipment suitable for rotary kiln-grate pellet flue gas

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no. 1 example

[0030] The embodiment of the present invention provides a SNCR denitrification process suitable for rotary kiln-grate pellet flue gas, which is to dilute the ammonia water produced by the steel plant on-line to a mass concentration of 5% to 10%, and use compressed air to dilute the diluted The final ammonia water is atomized and sprayed into different areas of the rotary kiln reaction zone (temperature is 850-1100°C), the ammonia gas produced by the ammonia water and the NO x Carry out selective non-catalytic reduction reaction to pellet NO in flue gas x converted to non-polluting N 2 and H 2 O. The SNCR denitrification process of the embodiment of the present invention applies the SNCR method to the sintering and pelletizing denitrification of steel mills, and proposes a new idea for sintering and pelletizing denitrification of steel mills. Steel mills generally have coking plants, and the coking process will produce ammonia water. For the denitrification needs of steel mi...

no. 2 example

[0041] Please refer to figure 2 , this embodiment provides an SNCR denitrification device 200 suitable for rotary kiln-grate pellet flue gas, which includes an ammonia water tank 111, a dilution water tank 121, a compressed air storage tank 131, a mixing and dilution device 140, a metering distribution device and A plurality of spraying devices 160 arranged in different areas of the reaction zone of the rotary kiln 001, the mixing and diluting device 140 communicates with the ammonia water tank 111 and the dilution water tank 121 respectively, the mixing and diluting device 140, the metering and distributing device, and the spraying device 160 communicate in sequence, and the compression The air storage tank 131 communicates with the injection device 160 . The ammonia water in the ammonia water tank 111 and the dilution water in the dilution water tank 121 are respectively sent to the mixing and diluting device 140 to be mixed and diluted, and then metered and distributed by ...

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Abstract

The invention provides an SNCR denitration process and SNCR denitration equipment suitable for rotary kiln-grate pellet flue gas, and relates to the field of industrial waste gas treatment. The process includes subjecting aqueous ammonia produced by a steel work itself to on-line diluting, and spraying the diluted aqueous ammonia into different areas of a rotary kiln reaction zone by utilizing compressed air. The aqueous ammonia produced by the steel work itself is adopted as a reductant in the process, and is convenient and cheap, an optimum SNCR denitration efficiency is achieved, and lowestammonia escape is ensured. The equipment includes an aqueous ammonia tank, a diluting water tank, a compressed air storage tank, mixing and diluting gears, a metering and distributing gear and a plurality of sprayers disposed in different areas of the rotary kiln reaction zone. The mixing and diluting gears are communicated with the aqueous ammonia tank and the diluting water tank. The mixing anddiluting gears, the metering and distributing gear, and the sprayers are communicated in order. The compressed air storage tank is communicated with the sprayers. The SNCR denitration equipment is simple in device and low in investment and running cost.

Description

technical field [0001] The invention relates to the field of industrial waste gas treatment, in particular to an SNCR denitrification process and an SNCR denitrification device suitable for rotary kiln-grate pellet flue gas. Background technique [0002] As an important part of the national industry, the iron and steel industry produces NO x The total amount occupies the second place among the stationary sources, second only to SO 2 emissions. Among them, NO in the process of sintering and pelletizing x Emissions account for about x about half of the total emissions. In June 2017, the Ministry of Environmental Protection issued a revision draft of the "Steel Sintering and Pelletizing Industry Air Pollutant Emission Standard" (GB28662-2012), requiring the limit value of nitrogen oxides to be changed from 300mg / m 3 Adjust to 100mg / m 3 . With the increasingly stringent national environmental protection policies, it is imperative to implement denitrification in sintering ...

Claims

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Application Information

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IPC IPC(8): B01D53/79B01D53/56
CPCB01D53/56B01D53/79B01D2251/2062
Inventor 李啸甘牧原陈阳罗海兵黎柳升梁杰群韦晋科秦川施飞
Owner CHINA CITY ENVIRONMENT PROTECTION ENGINEERING LIMITED COMPANY
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