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

A technology of production process and production system, applied in the fields of environmental protection and pellet production, can solve the problems of substandard discharge, expensive denitration device, reduction of thermal NOx, etc.

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

[0013] In view of the existing problems in the prior art, in order to solve the NO x The emission is not up to standard and the cost of adding a denitrification device at the end is unacceptable to enterprises. This patent proposes to add a set of flue gas circulation system to circulate part of the desulfurized flue gas back to the ring cooling section as cooling air, and use this cooling air to carry The heat and low oxygen conditions realize high-temperature exhaust gas and low-oxygen combustion, which reduces the peak temperature of the flame burned in the kiln and reduces thermal NOx. At the same time, the low-oxygen exhaust gas dilutes the O in the combustion air. 2 , reducing the local oxygen concentration, reducing fuel-type NOx, so as to achieve the purpose of reducing NOx in low oxygen

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0109] like Figure 5 shown, a chain grate-rotary kiln pellet with low NO x Production system, the system includes: chain grate machine 1, rotary kiln 2, ring cooler C. Wherein: according to the process trend, the chain grate machine 1 is sequentially provided with a blast drying section UDD, a suction drying section DDD, a preheating section TPH and a preheating second section PH. The ring cooler C is sequentially provided with a first ring cooling section C1, a second ring cooling section C2 and a third ring cooling section C3. The tail end of the rotary kiln 2 is connected to the second preheating stage PH of the chain grate 1 and the other end is connected to the annular cooling stage C1 of the annular cooler C.

[0110] Wherein: the air outlet C1b of the first stage C1 of annular cooling is connected to the air inlet 201 of the rotary kiln 2 through the first pipeline L1. The air outlet 202 of the rotary kiln 2 is connected to the air inlet 301 of the preheating second...

Embodiment 2

[0115] like Image 6 As shown, Example 1 is repeated except that a branch is branched from the eighth pipeline L8, which is the ninth pipeline L9. The ninth pipe L9 is connected to the air inlet C3a of the third annular cooling section C3. A reducing agent injection device 5 is arranged in the bottom bellows of the third stage C3 of the ring cooling.

Embodiment 3

[0117] like Figure 7 As shown, Example 2 is repeated, except that in the preheating section of TPH, a preheating section burner 4 is arranged above the surface of the green pellets. In the preheating second stage PH, there is a preheating stage burner 4 located above the raw material surface.

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Abstract

The invention provides a low-NOx grate-rotary kiln pellet production technology. The production technology includes utilizing blended flue gas W exhausted from a down-draft drying section (DDD) and aprimary preheating section (TPH) as cooling air to be delivered to an air inlet of (1) a primary circular cooling section (C1) and (2) an air inlet of a secondary circular cooling section (C2), spraying a reducer into a bottom air box of the circular cooling section (C2), making the reducer and the blended flue gas exhausted from the down-draft drying section (DDD) and the primary preheating section (TPH) to react with NOx so as to achieve SNCR (selective non-catalytic reduction) denitration. The low-NOx grate-rotary kiln pellet production technology has the advantages that the production pressure of enterprise atmospheric pollutant emission limits on pellet calcination equipment can be reduced to a certain degree, and the production technology is saving in investment, low in running costand remarkable in 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 with low NO x The (nitrogen oxide) production process and production system belong to the technical field 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 sintered ore, because the pellet production process has low energy consumption, relatively friendly environment, and the product has the advantages of good strength, high grade and good metallurgical performance, the application in blast furnace smelting can increase production and save coke, and improve the technical economy of ironmaking. Therefore, pellets have been vigorously developed in my country in recent years. [0003] The production of pellets in my country is ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/20C22B1/216C22B1/26B01D53/86B01D53/90
CPCB01D53/8631B01D53/8696B01D53/90C22B1/20C22B1/216C22B1/26Y02A50/20
Inventor 胡兵陆彪叶恒棣储太山
Owner ZHONGYE-CHANGTIAN INT ENG CO LTD
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