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A kind of chain grate - rotary kiln pellets low no x Production process and its system

A production process and production system technology, applied in the chain grate-rotary kiln pellet low-NOx production process and production system, and the chain grate-rotary kiln pellet production field, which can solve the problem of substandard discharge and expensive denitrification devices, etc. question

Active Publication Date: 2020-07-03
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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  • A kind of chain grate - rotary kiln pellets low no <sub>x</sub> Production process and its system
  • A kind of chain grate - rotary kiln pellets low no <sub>x</sub> Production process and its system
  • A kind of chain grate - rotary kiln pellets low no <sub>x</sub> Production process and its system

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Experimental program
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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 a first stage of annular cooling C1, a second stage of annular cooling C2 and a 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 pipeline L...

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 reduction 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 grate machine-rotary kiln pellet with low NO x The production process involves spraying a reduction activator above the green balls in the exhaust drying section (DDD). The reduction activator is mixed with the hot air entering the exhaust drying section (DDD) from the rotary kiln (2). NO x reaction to achieve SCR denitration. As a preferred solution, an excess reduction activator with catalytic effect is sprayed into a suitable temperature range (<950°C) above the material surface of the second preheating stage (PH). The technical solution of the present invention solves the above technical problems and has the characteristics of "saving investment, low operating cost, less ammonia escape, NO x "Remarkable 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 with 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 rece...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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