Grate-rotary kiln pellet low NOx production process and system

A production process and production system technology, applied in gas treatment, membrane technology, dispersed particle separation, etc., can solve the problems of low sulfur content, expensive denitrification equipment, and low dust content.

Active Publication Date: 2018-12-21
ZHONGYE-CHANGTIAN INT ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In view of the existing problems in the prior art, in order to solve the NO x Disadvantages of emissions and the high cost of adding denitrification devices at the end are unacceptable to enterprises. This patent proposes to circulate all or part (10% to 70%) of the desulfurized flue gas back to the second ring cooling section as coolin...

Method used

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  • Grate-rotary kiln pellet low NOx production process and system
  • Grate-rotary kiln pellet low NOx production process and system
  • Grate-rotary kiln pellet low NOx production process and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0104] like Figure 5 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.

[0105] 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 pipelin...

Embodiment 2

[0110] like Image 6 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.

[0111] 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...

Embodiment 3

[0116] like Figure 7 As shown, Example 2 is repeated, except that in the preheating second-stage PH, a reducing agent injection device 4 is provided above the surface of the green pellets.

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Abstract

The invention provides a grate-rotary kiln pellet low NOx production process. The process comprises the following steps that flue gas exhausted from an air draft drying section (DDD) and a first preheating section (TPH) is used as cooling wind and conveyed to an air inlet of a ring-cooling second section (C2), a reducing agent is sprayed into the position of an air box at the bottom of the ring-cooling second section (C2), the reducing agent reacts with NOx in the flue gas exhausted from the air draft drying section (DDD) and the first preheating section (TPH), so that SNCR denitration is realized. The production process and system have the characteristics that the investment is saved, the operation cost is low, and the NOx emission reduction effect is remarkable.

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): C22B1/02B01D53/90B01D53/56
CPCB01D53/8628B01D53/90B01D2258/0283C22B1/02
Inventor 胡兵陆彪叶恒棣储太山
Owner ZHONGYE-CHANGTIAN INT ENG CO LTD
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