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Grate - rotary kiln pellets low no x Production device and pellet production method

A technology of production equipment and rotary kiln, which is applied to furnaces, lighting and heating equipment, furnace types, etc., and can solve the problems of high investment cost, high quality requirements of raw materials, and impact of output and quality on pellet production.

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

These methods not only affect the production of pellets in terms of output and quality, but also have high requirements on the quality of raw materials and fuels, resulting in increased costs, and cannot fundamentally solve the problem of low NO in pellets. x production problem
In addition, adding a denitrification device after the main exhaust fan, such as the use of selective catalytic reduction technology (SCR) and non-selective catalytic reduction technology (SNCR), although it can achieve low NO x However, due to its high investment cost, high equipment requirements, high energy consumption, high denitration cost and secondary pollution, it has not been popularized and applied in pelletizing enterprises. At present, domestic and foreign pelletizing plants NO x The control method is mainly realized through process control

Method used

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  • Grate - rotary kiln pellets low no <sub>x</sub> Production device and pellet production method
  • Grate - rotary kiln pellets low no <sub>x</sub> Production device and pellet production method
  • Grate - rotary kiln pellets low no <sub>x</sub> Production device and pellet production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0071] According to the second embodiment provided by the present invention, a kind of grate machine-rotary kiln pellet (low NO x method) production method.

[0072] A method for producing chain grate-rotary kiln pellets or a low NO x A method for producing pellets by a production device, the method comprising the following steps:

[0073] 1) The green balls of iron ore are dried sequentially through the blast drying section UDD and the exhaust drying section DDD of the grate, and then heated through the first preheating section TPH and the second preheating section PH,

[0074] 2) The heated iron ore pellets further pass through the transition section 2 provided with the reductant injection device 1 between the second preheating section PH and the rotary kiln Kiln, wherein in the transition section 2, passing through and flowing through the transition section 2 The hot flue gas in section 2 injects the reducing gas in reverse to make the reducing gas and the iron ore pellet...

Embodiment 1

[0083] Such as figure 2 , a grate-rotary kiln pellet with low NO xProduction device, it comprises chain grate 3, the rotary kiln Kiln that links to each other with the end of chain grate 3 and the annular cooler C that is positioned at the front end of rotary kiln Kiln. And, according to process trend, described grate machine 3 is provided with blast drying section UDD, draft drying section DDD, the first preheating section TPH and the second preheating section PH successively. The ring cooler C is provided with the first cooling section C1, the second cooling section C2 and the third cooling section C3 in sequence. The tail end of the rotary kiln Kiln is connected to the second preheating section PH and the front end is connected to the first cooling section of the ring cooler C. C1.

[0084] The air outlet C2b of the second cooling section C2 is connected to the air inlet TPHa of the first preheating section TPH via the first pipeline L1. The air outlet C3b of the third ...

Embodiment 2

[0089] Repeat Example 1, just as image 3 , the air drying section DDD of the device is further divided into a first air drying section DDD1 and a second air drying section DDD2. The first draft drying section DDD1 is connected to the blast drying section UDD, and the second draft drying section DDD2 is connected to the first preheating section TPH. The eighth pipeline L8 drawn from the air outlet DDD2b of the bottom air box of the second air extraction and drying section DDD2 is connected to the air inlet C1a of the first cooling section C1 of the annular cooler C. The ninth pipeline L9 drawn from the air outlet DDD1b of the bottom wind box of the first draft drying section DDD1 and the fourth pipeline L4 drawn from the air outlet TPHb of the first preheating section TPH are both connected to the chimney 7 after being combined.

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Abstract

The invention provides a device for producing grate-kiln pellets through a low-NOx manner. The device comprises a grate (3), a kiln (Kiln) connected with the grate (3) and a circular cooler (C) connected with the kiln (Kiln), wherein a reducing agent spraying device (1) is arranged on a transition section (2) between a second preheating section (PH) of the grate (3) and the tail end of the kiln (Kiln); a technical manner is used for reversely spraying reducing gas to the smoke and enabling the reducing gas to be fully mixed and reacted with the high-temperature smoke generated after roasting iron ore pellet materials for a long time so as to reduce the content of NOx in the smoke through non-catalytic reduction of NOx; meanwhile, a technical manner is used for enabling the smoke in an outlet of the second preheating section (PH) to flow through an down-draft drying section (DDD) and then returning part of the smoke to a first cooling section (C1) of the circular cooler (C) so as to reduce the escape of the reducing agent and further reduce the emission amount of NOx. Through synergistic action of the above two technical manners, the grate-kiln pellets can be produced through the low-NOx manner.

Description

technical field [0001] The invention relates to the technical field of engineering grate-rotary kiln pellets, in particular to a grate-rotary kiln pellet with low NO x (Nitrogen oxide) production device and iron ore pellet production method. Background technique [0002] Pellets are the main iron-containing charge produced by 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 well developed in our country. [0003] my country's pellet production is dominated by the grate-rotar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F27B19/04F27D15/02F27D17/00C22B1/02
CPCC22B1/02F27B19/04F27D15/02F27D17/00F27D17/004F27D17/008Y02P10/25
Inventor 胡兵代友训周志安王兆才
Owner ZHONGYE-CHANGTIAN INT ENG CO LTD