Method for reducing NOx discharge in sintering process by using additive modified coke

A sintering process and additive technology, applied in the field of metallurgical environmental protection, can solve the problems of high investment cost and operating cost, large flue gas emission, difficult treatment, etc., so as to reduce the energy consumption of sintering, reduce the emission of CO, and improve the combustion efficiency. Effect

Inactive Publication Date: 2008-03-26
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sintering is characterized by low concentration of NOx in flue gas (200ppm~300ppm) and large flue gas emissions (100m3/m2 · min), i

Method used

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  • Method for reducing NOx discharge in sintering process by using additive modified coke
  • Method for reducing NOx discharge in sintering process by using additive modified coke
  • Method for reducing NOx discharge in sintering process by using additive modified coke

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Experimental program
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Effect test

Embodiment 1

[0030] 0.2g, 0.3g and 0.4g of CeO with a particle size of 20-30μm 2 Add to 20g water to make 1.0%, 1.5% and 2.0% CeO 2 Emulsion, under stirring at 30r / min, add 5g of coke particles with a particle size of 0.8-1.0mm respectively, remove the coke after 25 minutes, and dry at 60°C to obtain 5.026g, 5.051g and 5.102g of adsorption CeO 2 of coke. CeO 2 NO in the combustion process of modified coke before and after x The emission concentration is shown in Figure 1. The test parameters are: the coke mass is 1.0g, the air flow rate is 4.0L / min, and the initial combustion temperature is 900°C. by CeO 2 After modification, NO in the process of coke combustion can be reduced x emission concentration, and with the CeO in coke 2 content increase, NO x The emission concentration gradually decreased. The CO emission concentration during coke combustion before and after modification is shown in Fig. 2. by CeO 2 After modification, the emission concentration of CO during coke combus...

Embodiment 2

[0032] 0.4g CaCO with a particle size of 20-30μm 3 and Fe 3 o 4 Add to 20g water to make 2.0% CaCO 3 Emulsion and Fe 3 o 4 Add 5g of coke particles with a particle size of 0.8-1.0mm to the emulsion under stirring at a speed of 30r / min, remove the coke after 25 minutes, and dry at 60°C to obtain 5.102g of adsorbed CaCO 3 and Fe 3 o 4 of coke. CaCO 3 , Fe 3 o 4 NO in the combustion process of modified coke before and after x The emission concentration is shown in Figure 4, and the test parameters are: the coke mass is 1.0g, the air flow rate is 4.0L / min, and the initial combustion temperature is 900°C. Add 2.0% CaCO to coke 3 Can make NO in the process of coke combustion x The maximum emission concentration is reduced by about 30%, and 2.0% Fe is added to the coke 3 o 4 Can make NO in the process of coke combustion x The maximum emission concentration is reduced by about 50%.

Embodiment 3

[0034] 0.133g NiO and 0.267g CaCO 3 , 0.200g NiO and 0.200g CaCO 3 and 0.267g NiO and 0.133g CaCO 3 Add to 20g water to make 2.0% different NiO / CaCO 3 Ratio of emulsion, NiO and CaCO 3 The particle size of each particle is 20-30 μm. Under stirring at 30 r / min, 5 g of coke particles with a particle size of 0.8-1.0 mm are respectively added. After 25 minutes, the coke is taken out and dried at 60 ° C to obtain 5.102 g Adsorption of different NiO / CaCO 3 ratio of coke. Different NiO / CaCO 3 The proportion of the mixture modified coke before and after the combustion process of NO x The emission concentration is shown in Figure 5, and the test parameters are: the coke mass is 1.0g, the air flow rate is 4.0L / min, and the initial combustion temperature is 900°C. With NiO / CaCO 3 With the increase of the mass ratio, the NO in the combustion process of the modified coke x The emission concentration gradually decreased. When NiO / CaCO 3 When the mass ratio is 0.5:1, add 2.0% NiO ...

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Abstract

The method of utilizing additive modified coke to reduce NOx exhaust during agglomeration belongs to the field of metallurgical environment protecting technology. The technological process includes modifying coke through soaking coke inside 0.5-10.0 wt% concentration additive emulsion to load additive in 0.5-4.0 wt% of coke to the pores and surface, and agglomerating iron ore through burning the modified coke. The technological process can reduce the conversion of nitrogen in the coke to NOx and reduce NOx exhaust by 30-50 % while raising the coke burning rate and lowering the coke consumption.

Description

technical field [0001] The invention belongs to the field of metallurgical environmental protection, in particular to an additive modified coke to reduce NO in the sintering process x (x is 1, 2) method of emission. Background technique [0002] Currently, my country's NO x The annual emissions are at 1.0×10 6 More than tons, the sintering process of the iron and steel industry produces NO x One of the main sources, which produces NO x About NO in the whole country x 10% of total emissions. NO x It is easy to form acid rain and photochemical smog, which affects the ecological environment and endangers human health, and effectively reduces NO in the sintering process x emission is very necessary. [0003] NO produced during sintering x Mainly NO, accounting for about NO x More than 95% of the total. Sintering is characterized by NO in the flue gas x Low concentration (200ppm~300ppm), large flue gas emission (100m 3 / m 2 · min), it is difficult to use traditional...

Claims

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Application Information

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IPC IPC(8): C22B1/16
Inventor 陈彦广郭占成王志
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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