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Low-NOx grate-rotary kiln pellet production technology and low-NOx grate-rotary kiln pellet production system

A production process and production system technology, applied in the direction of rotary drum furnace, furnace type, gas treatment, etc., can solve the problems of substandard emissions and expensive denitrification equipment

Active Publication Date: 2019-01-04
ZHONGYE-CHANGTIAN INT ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In view of the existing situation in the prior art, in order to solve the NO x Disadvantages of emissions and the cost of adding denitrification devices at the end are unacceptable to enterprises. This patent proposes to optimize and adjust the green pellet temperature (300-450°C) in the draft drying section (DDD), and spray into the draft drying section (DDD) Reduction of activators to meet NO x When passing through the material layer, under the catalysis of green balls, it is combined with NH 3 N 2 , to achieve SCR denitrification

Method used

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  • Low-NOx grate-rotary kiln pellet production technology and low-NOx grate-rotary kiln pellet production system
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  • Low-NOx grate-rotary kiln pellet production technology and low-NOx grate-rotary kiln pellet production system

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Effect test

Embodiment 1

[0120] Such as Figure 4 As shown, a grate-rotary kiln pellet with low NO x Production system, the system includes: grate machine 1, rotary kiln 2, ring cooler C. Wherein: according to the process trend, the grate 1 is sequentially provided with a blast drying section UDD, a draft drying section DDD, a preheating section TPH and a preheating section PH. The annular cooler C is sequentially provided with the first stage of annular cooling C1, the second stage of annular cooling C2 and the third stage of annular cooling C3. The tail end of the rotary kiln 2 is connected to the preheating second section PH of the grate 1 and the other end is connected to the annular cooling section C1 of the annular cooler C.

[0121] Wherein: the air outlet C1b of the ring cooling section C1 is connected to the air inlet 201 of the rotary kiln 2 via the first pipeline L1. The air outlet 202 of the rotary kiln 2 is connected to the air inlet 301 of the preheating stage 2 PH via the second pipe...

Embodiment 2

[0126] Such as Figure 5 As shown, embodiment 1 is repeated, except that the fourth pipeline L4 branched out into a sixth pipeline L6. The sixth pipeline L6 is connected to the air inlet 303 of the draft drying section DDD.

Embodiment 3

[0128] Such as Figure 5 Shown, repeat embodiment 2, just be provided with reducing activator atomizing device 4 in preheating second stage PH. The reducing activator atomizing device 4 includes a nozzle 401 . The nozzle 401 is arranged above the inside of the preheating stage 2 PH.

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Abstract

The invention provides a low-NOx grate-rotary kiln pellet production technology. The production technology includes spraying a reduction activator into a position, above fresh pellets, in a down-draftdrying section (DDD), and enabling the reduction activator to react with NOx in hot air entering the down-draft drying section (DDD) from a rotary kiln (2) so as to achieve SNCR (selective non-catalytic reduction) denitration. In a preferred scheme, the step of excessively spraying the reduction activator with a catalytic effect into a proper temperature range (950 DEG C) above a material surfaceof a secondary preheating section (PH) is added. The low-NOx grate-rotary kiln pellet production technology solves existing technical problems and has the advantages of lower investment, low runningcost, less ammonia escape and remarkable NOx emission reduction effect.

Description

technical field [0001] The invention relates to a chain grate-rotary kiln pellet production technology, in particular to a chain grate-rotary kiln pellet low NO x (Nitrogen oxide) production process and production system, belonging to the technical fields of pellet production and environmental protection. Background technique [0002] Pellets are the main iron-containing charge for blast furnace ironmaking in my country. In 2015, the output of pellets in my country was 128 million tons. Compared with sinter, due to the low energy consumption and relatively friendly environment of the pellet production process, and the product has the advantages of good strength, high grade, and good metallurgical properties, it can increase production and save coke when applied to blast furnace smelting, and improve ironmaking technology and economy Indicators, reducing the cost of pig iron, and improving economic benefits, so pellets have been vigorously developed in my country in recent ye...

Claims

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Application Information

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IPC IPC(8): C22B1/20C22B1/216C22B1/26B01D53/86B01D53/90
CPCB01D53/8631B01D53/8696B01D53/90B01D2258/0283C22B1/20C22B1/216C22B1/26
Inventor 胡兵陆彪叶恒棣储太山
Owner ZHONGYE-CHANGTIAN INT ENG CO LTD
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