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Denitrification system and method for sintering gas without ammonia reductant

A technology of sintering flue gas and reducing agent, which is applied in the field of sintering flue gas denitrification system without ammonia reducing agent, can solve the problems of low removal efficiency, large amount of flue gas from sintering machine, and high removal cost, so as to simplify the process flow, The effect of reducing floor space and simplifying process equipment

Inactive Publication Date: 2011-09-21
BAOSTEEL ENG & TECH GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This is because: the flue gas volume of the sintering machine is large, and the average concentration of NOx is much lower than that of the coal-fired boiler flue gas of the power plant. The cost is prohibitively high

Method used

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  • Denitrification system and method for sintering gas without ammonia reductant
  • Denitrification system and method for sintering gas without ammonia reductant

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Embodiment approach

[0033] After the dust remover, the sintering flue gas is heated to a suitable temperature by a heater and then sent to the denitrification reactor. Since the denitrification reactor is equipped with a catalyst layer, the catalytic reduction reaction is carried out to remove NOx under the action of the catalyst, and the removal efficiency can reach 80 % to 90% or even higher, the sintering flue gas after the reaction is discharged into the atmosphere after dust removal and desulfurization.

[0034] In this embodiment, since the denitrification reactor is arranged behind the dust collector, the energy consumed by the heater is slightly larger during operation, but the consumption of this iron ore catalyst can be reduced; the denitrification reactor can also be designed as a fluidized bed , in order to replace the catalyst online.

[0035] Through research, it is found that CO in the sintering flue gas itself can reduce NOx by 10% to 15% by raising the temperature without a catal...

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Abstract

The invention relates to a denitrification system and a method for sintering gas without an ammonia reductant. The system comprises a sintering machine, a heater, a denitrification reactor, a deduster, a fan, a desulfurization tower and a chimney, wherein the deduster, the fan, the heater, the denitrification reactor, the desulfurization tower, and the chimney are sequentially connected with the sintering machine. The denitrification reactor is connected to the sintering machine behind the deduster, i.e., the deduster, the fan, and the heater are sequentially connected between the sintering machine and the denitrification reactor. The denitration reactor is provided with a catalyst layer. The method comprises the following steps that: after being processed through the deduster, the sintering gas is heated to a appropriate temperature through the heater, and is send to the denitration reactor; the sintering gas is subjected to a catalytic reduction in the presence of a catalyst in the denitration reactor to remove NOx; after being dedusted and desulfurized, the reacted sintering gas is discharged in atmospheric environment. With the present invention, the ammonia reductant does not require; sources of the catalyst are extensive; price of the catalyst is low; investment and operation cost of the system are relative low. In the present invention, the ammonia reductant does not be adopted, a reduction component CO in the sintering gas is adopted as the reductant, such that a plurality of problems due to adopting the ammonia reductant are avoided.

Description

technical field [0001] The invention relates to emission reduction of nitrogen oxides (NOx) in sintering flue gas, belongs to the technology for reducing emission of nitrogen oxides in sintering flue gas in the field of iron and steel metallurgy, and is a sintering flue gas denitrification system and method without ammonia reducing agent. Background technique [0002] Sintering production is one of the most important process units of modern steel production, and a large amount of air pollutants are produced during the production process, such as particulate matter, NOx, SO 2 , CO, PCDD / F, various heavy metals, etc., are the largest polluters of iron and steel complexes, and also the largest NOx polluters of iron and steel complexes, because sintering NOx emissions usually account for 50% of the total emissions of the entire plant ~60%, excluding captive power plants. At present, the country has listed NOx in the total control index of the "Twelfth Five-Year Plan". Clear re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/56F23J15/00
Inventor 张传秀吴伟
Owner BAOSTEEL ENG & TECH GRP
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