Three-channel pulverized coal burner and rotary kiln with same

A pulverized coal burner and three-channel technology are applied in the directions of burners, burners, and combustion methods for burning powder fuel, which can solve the problems of heating burden, increase in nitrogen oxides, and increase in fuel consumption, and achieve easy installation and good quality. Industrial production value, the effect of simple structure

Pending Publication Date: 2021-03-12
ANSTEEL GRP MINING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still some problems in the application of the four-channel pulverized coal burner in the grate-rotary kiln pellet production line: (1) The pulverized coal burns too fast, which easily forms a local high temperature in the kiln, causing the rotary kiln to form rings; (2) ) The entry of external combustion-supporting air will increase a large amount of cold air in the kiln, which will bring additional burden to the system heating and increase fuel consumption; (3) Under the action of external combustion-supporting air, the kiln will be in an oxygen-enriched state, making the system Increased nitrogen oxides produced in

Method used

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  • Three-channel pulverized coal burner and rotary kiln with same
  • Three-channel pulverized coal burner and rotary kiln with same
  • Three-channel pulverized coal burner and rotary kiln with same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The coal feed rate of the rotary kiln is 5.2 t / h, the opening degree of the control disc valve I on the outer layer of the three-channel pulverized coal burner is 80%, the opening degree of the control disc valve II on the middle layer is 30%, and the opening degree of the control disc valve III on the inner layer is When the opening is 60%, the flame shape is regular, the length is 17±0.5 meters, and the temperature of the rotary kiln head is 1130±10°C.

Embodiment 2

[0039] The coal feed rate of the rotary kiln is 5.2 t / h, the opening degree of the control disc valve I on the outer layer of the three-channel pulverized coal burner is 100%, the opening degree of the control disc valve II on the middle layer is 0%, and the opening degree of the control disc valve III on the inner layer is When the opening is 80%, the flame shape is regular, the length is 19 ± 0.5 meters, and the temperature of the rotary kiln head is 1100 ± 10 °C.

Embodiment 3

[0041] The coal feed rate of the rotary kiln is 5.2 t / h, the opening degree of the control disc valve I on the outer layer of the three-channel pulverized coal burner is 60%, the opening degree of the control disc valve II on the middle layer is 100%, and the opening degree of the control disc valve III on the inner layer is When the opening is 20%, the flame shape is regular, the length is 15±0.5 meters, and the temperature of the rotary kiln head is 1150±10°C.

[0042] Adopt the method that above-mentioned embodiment provides and compare before adopting method and mainly have following effect:

[0043] (1) The flame shape and length can be adjusted in a wider range;

[0044] (2) Avoid local continuous high temperature in the kiln, so that the temperature in the rotary kiln is more uniform.

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Abstract

The invention relates to a three-channel pulverized coal burner. The three-channel pulverized coal burner comprises an outer-layer pipeline, a middle-layer pipeline, an inner-layer pipeline, an inner-layer pipeline feeding branch pipe, a middle-layer pipeline feeding branch pipe, an outer-layer pipeline feeding branch pipe, a connecting flange I, a connecting flange II, a sealing flange, a controlbutterfly valve I, a control butterfly valve II, a control butterfly valve III, rotational flow pieces and a pore plate. Three sleeves are sequentially connected in a sleeved mode from inside to outside, reinforcing ribs are arranged on the outer side of the outer-layer pipeline, supporting pieces are arranged between the outer-layer pipeline at the front end of the three-channel pulverized coalburner and the middle-layer pipeline, the rotational flow pieces are arranged between the middle-layer pipeline and the inner-layer pipeline, and the pore plate is arranged at the front end of an inner-layer pulverized coal channel. The three-channel pulverized coal burner has the advantages that the shapes and the lengths of flames in the three sleeves can be adjusted by adjusting the opening degrees of the inner-layer control butterfly valve, the middle-layer control butterfly valve and the outer-layer control butterfly valve, the combustion speed of pulverized coal can be controlled to be moderate without adding external combustion-supporting air, and then the temperature distribution in a rotary kiln is uniform.

Description

technical field [0001] The invention relates to the technical field of pellet production, in particular to a three-channel pulverized coal burner and a rotary kiln with the pulverized coal burner. Background technique [0002] Rotary kiln refers to rotary calcining kiln (commonly known as rotary kiln), which is a very important part of the grate-rotary kiln-ring cooler pellet production process system, mainly responsible for the process of raw pellet roasting. At present, domestic pelletizing plants mainly install the main coal gun at the kiln head of the rotary kiln to provide heat sources for the entire grate-rotary kiln operating system. [0003] At present, most of the coal injection systems of domestic grate machine-rotary kiln pellet production lines use four-channel pulverized coal burners. The four-channel pulverized coal burner introduces various forms of wind to make the flame shape easy to adjust, and the pulverized coal burns more thoroughly in a short time. Ho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23D1/02F27B7/34
CPCF23D1/02F27B7/34
Inventor 姚茂斌路明高源宋长春王鑫王峥崔广建
Owner ANSTEEL GRP MINING CO LTD
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