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Double-rotational-flow pulverized coal burner and chain grate with same

A pulverized coal burner and double-swirl technology are applied in the direction of burners, burners, and combustion methods for burning powder fuels, and can solve problems such as increased nitrogen oxide emissions, increased equipment load, and ring formation in rotary kilns. Improve the quality of the hot ball, complete combustion, and good combustion effect

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

[0009] However, in order to achieve the temperature required for the second stage of grate preheating, the temperature of the rotary kiln is usually around 1300 °C, which exceeds the 1250 °C required by the rotary kiln process, which will result in ringing of the rotary kiln, Increased equipment load, increased nitrogen oxide emissions, and energy waste

Method used

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  • Double-rotational-flow pulverized coal burner and chain grate with same
  • Double-rotational-flow pulverized coal burner and chain grate with same
  • Double-rotational-flow pulverized coal burner and chain grate with same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Coal feed rate of rotary kiln is 4 t / h;

[0037] Rotary kiln head temperature 1150 ℃;

[0038] The coal feed rate of the double swirl pulverized coal burner in the grate preheating section Ⅱ is 0.8 t / h;

[0039] Control the opening of disc valve II37 to 50%, and control the opening of disc valve I35 to 100%;

[0040] The temperature of the fume hood in the preheating section II is 1050°C.

Embodiment 2

[0042] Coal feed rate of rotary kiln is 3.8t / h;

[0043] Rotary kiln kiln head temperature 1130 ℃;

[0044] The coal feed rate of the double swirl pulverized coal burner in the grate preheating section Ⅱ is 1.0 t / h;

[0045] Control the opening of disc valve II37 to 50%, and control the opening of disc valve I35 to 100%;

[0046] The temperature of the fume hood in the second stage of grate preheating is 1070°C.

Embodiment 3

[0048] Coal feed rate of rotary kiln is 3.7t / h;

[0049] The kiln head temperature of the rotary kiln is 1115°C;

[0050] The coal feed rate of the double swirl pulverized coal burner in the grate preheating section Ⅱ is 1.2 t / h;

[0051] Control the opening of disc valve II37 to 50%, and control the opening of disc valve I35 to 100%;

[0052] The temperature of the hood in the grate preheating section II is 1086°C;

[0053] The compressive strength of preheating balls in each example is shown in Table 1.

[0054] Table 1 Comparison of compressive strength of preheated balls

[0055]

[0056] With the double-swirl pulverized coal burner provided by the present invention, after the coal feed to the rotary kiln is reduced, it can still meet the requirements of the grate preheating section II; The burner, changing the single heating mode of the rotary kiln head, makes the heating mode more flexible, and the temperature control of the second stage of preheating is more accu...

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Abstract

The invention relates to a double-rotational-flow pulverized coal burner and a chain grate with the double-rotational-flow pulverized coal burner. The double-rotational-flow pulverized coal burner ischaracterized by comprising an outer-layer pipeline, an inner-layer pipeline arranged in the outer-layer pipeline through a connecting flange, an inner-layer pipeline feeding branch pipe, an outer-layer pipeline feeding branch pipe, a control butterfly valve II, a control butterfly valve I and a rotational flow plate group, wherein a sealing flange is arranged at the rear end of the inner-layer pipeline, a pulverized coal outlet is formed in the front end of the double-rotational-flow pulverized coal burner, the rotational flow plate group is composed of an inner rotational flow plate and an outer rotational flow plate and arranged on the inner side of the pulverized coal outlet end of the double-rotational-flow pulverized coal burner, the inner rotational flow plate is arranged at the pulverized coal outlet end of an inner-layer pulverized coal channel, and the outer rotational flow plate is arranged at the pulverized coal outlet end of an outer-layer pulverized coal channel. According to the technical scheme, double rotational flow plates are arranged at the front end of the double-rotational-flow pulverized coal burner, when pulverized coal passes through the double rotational flow plates, the flow speed and direction of pulverized coal airflow are changed in the rotating process, rotating flames are sprayed out of the double-rotational-flow pulverized coal burner, thus theburning effect is good, the burning efficiency is high, and the burning is complete.

Description

technical field [0001] The invention relates to the technical field of pellet production, in particular to a double swirl pulverized coal burner and a chain grate equipped with the pulverized coal burner. Background technique [0002] Rotary kiln-grate is widely used in pellet production. In the existing rotary kiln grate, the high-temperature flue gas entering the grate mainly comes from the ring cooler. [0003] The grate-rotary kiln production line is one of the advanced production systems for domestic pellet production at present, and its production technology is mature, including sequentially connected chain grate, rotary kiln and ring cooler. The grate machine is divided into blast drying section, exhaust drying section, preheating section I, and preheating section II; the ring cooler is divided into the first ring cooling section, the second ring cooling section and the third ring cooling section. [0004] Grate machine is a kind of crawler heat transfer equipment. I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23D1/02F27D13/00F27D99/00
CPCF23D1/02F27D13/00F27D99/0033
Inventor 于洪军李跃路明尚丹肖雷吴彤李旸高源
Owner ANSTEEL GRP MINING CO LTD
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