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Preignition chamber with surrounding air suitable for rotational flow pulverized coal burner

A pulverized coal burner and pre-combustion chamber technology, which is applied in the direction of burning powder fuel burners, burners, and the combustion of block fuel and powder fuel, and can solve the problem of easy ash accumulation and slagging in the pre-combustion chamber problems, to avoid high-temperature flue gas erosion, protect the pre-combustion chamber, and prolong the service life

Inactive Publication Date: 2018-01-09
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of easy dust accumulation and slagging in the existing pre-combustion chamber and ensure the long-term stable operation of the pre-combustion chamber, the present invention further proposes a pre-combustion chamber with peripheral wind suitable for swirl pulverized coal burners

Method used

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  • Preignition chamber with surrounding air suitable for rotational flow pulverized coal burner
  • Preignition chamber with surrounding air suitable for rotational flow pulverized coal burner

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specific Embodiment approach 1

[0017] Specific implementation mode one: combine figure 1 and figure 2 Describe this embodiment, a pre-combustion chamber with peripheral wind suitable for a swirl pulverized coal burner described in this embodiment includes a pre-combustion chamber 2 and a plurality of peripheral air nozzles 3, and the swirl pulverized coal burner 1 is arranged on the pre-combustion chamber In the middle of the bottom of the combustion chamber 2, the bottom of the pre-combustion chamber 2 is evenly distributed with a plurality of peripheral wind nozzles 3 along the circumferential direction, the peripheral wind nozzles 3 are inserted on the bottom surface of the pre-combustion chamber 2, and the inner side of the peripheral wind nozzle 3 is close to the pre-combustion chamber. On the inner cylinder wall of the combustion chamber 2, gas is transported in the peripheral wind nozzle 3 .

[0018] The air required for combustion passes through the swirl pulverized coal burner 1 and forms a swirl...

specific Embodiment approach 2

[0019] Specific implementation mode two: combination figure 1 and figure 2 Describe this embodiment, the inner diameter of the peripheral air nozzle 3 in this embodiment is 10 mm to 30 mm, and the distance between the center line of the inner end surface of the peripheral air nozzle 3 and the inner cylinder wall of the pre-combustion chamber 2 is 10 mm to 30 mm. Other compositions and connection methods are the same as those in Embodiment 1.

[0020] This design guarantees the gas flow velocity of the peripheral wind nozzle 3, i.e. the wind speed, and on the other hand ensures that the inner side of the peripheral wind nozzle 3 is close to the inner cylinder wall of the pre-combustion chamber 2.

specific Embodiment approach 3

[0021] Specific implementation mode three: combination figure 1 and figure 2 To describe this embodiment, an included angle α is set between the axial direction of the peripheral air nozzle 3 and the inner cylinder wall of the pre-chamber 2 in this embodiment. Other compositions and connection modes are the same as those in Embodiment 1 or 2.

[0022] The angle α between the axial direction of the peripheral wind nozzle 3 and the inner cylinder wall of the pre-chamber 2 can be adjusted according to needs, so as to ensure that the air flow is sprayed into the inner cylinder wall of the pre-chamber 2, and on the inner cylinder wall of the pre-chamber 2 A layer of "air film" is formed to prevent coal powder and ash from depositing on the wall of the pre-combustion chamber 2, and achieve the purpose of preventing powder accumulation and slagging in the pre-combustion chamber.

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Abstract

A preignition chamber with surrounding air suitable for a rotational flow pulverized coal burner relates to the technical field of coal powder boilers. The invention aims to solve the problems of easiness in ash accumulation and easiness in slagging of the existing preignition chamber, so as to ensure long-term stable operation of the preignition chamber. The preignition chamber comprises a preignition chamber and a plurality of surrounding air nozzles, the rotational flow pulverized coal burner is arranged in the middle of the bottom end of the preignition chamber, a plurality of surroundingair nozzles are uniformly distributed in the bottom end of the preignition chamber along a circumferential direction, the surrounding air nozzles are inserted in the bottom surfaces of the preignitionchamber, the inside ends of the surrounding air nozzles are tightly attached to the inner drum wall of the preignition chamber, and gas is conveyed in the surrounding air nozzles. The invention is suitable for the rotational flow pulverized coal burner.

Description

technical field [0001] The invention relates to the technical field of pulverized coal boilers, in particular to a pre-combustion chamber with peripheral air suitable for swirl pulverized coal burners. Background technique [0002] The pre-chamber is a cylindrical front-mounted combustion chamber made of heat-resistant steel or refractory material. The space in the pre-combustion chamber is narrow, and the heat released after the combustion of fuel oil or pulverized coal makes the temperature in the pre-combustion chamber rise rapidly, and can maintain a local high temperature; A high-temperature flue gas recirculation zone is formed below, so that the pulverized coal airflow can be stably ignited. After using the pre-combustion chamber burner, it can make the burner have good ignition and combustion performance, not only to achieve the effect of saving boiler start-up and low-load combustion-supporting oil, the fuel saving rate is as high as 70% to 90%, and it can be used ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23D1/02F23C5/08F23C7/00
Inventor 陈智超严蓉李鑫曾令艳李争起
Owner HARBIN INST OF TECH
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