Up-and-down thick-and-thin primary air concentrated distribution type combustion device

A technology of combustion device and secondary air, which is applied in the direction of combustion method, combustion type, combustion using block fuel and liquid fuel, etc. It can solve the problems such as difficulty in controlling the concentration of NOx emissions, expand the room for adjustment, and reduce the change of steam temperature. Effect

Active Publication Date: 2014-04-02
BEIJING GUODIAN LONGGAOKE ENVIRONMENT ENG& TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of difficulty in controlling the NOx emission concentration of pulverized coal boilers with high primary air rate at present, the present invention further provides a combustion device with centralized arrangement of upper and lower thick and thin primary air

Method used

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  • Up-and-down thick-and-thin primary air concentrated distribution type combustion device
  • Up-and-down thick-and-thin primary air concentrated distribution type combustion device
  • Up-and-down thick-and-thin primary air concentrated distribution type combustion device

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specific Embodiment approach 1

[0011] Specific implementation one: as Figures 1 to 2 As shown, the combustion device of the present embodiment in which the upper and lower concentrations of primary air are centrally arranged includes a primary air nozzle 1, a bottom support secondary air nozzle 3, a compact burnout air nozzle 4, a lower separated burnout air nozzle 5, and an upper separated type Burnout air nozzles 6 and two layers of fuel auxiliary secondary air nozzles 2, primary air nozzles 1 are provided with at least three layers from top to bottom, and the centrally arranged primary air nozzles 1 are located between the two layers of fuel auxiliary secondary air nozzles, located in the lower layer The bottom of the auxiliary fuel secondary air nozzle 2 is arranged with a bottom support secondary air nozzle 3, and the fuel auxiliary secondary air 2 located on the upper layer is arranged with a compact burnout air nozzle 4. Above the compact burnout air nozzle 4 The lower separation type burnout air no...

specific Embodiment approach 2

[0013] Specific implementation two: as figure 2 As shown, the range of the aspect ratio H / B of the primary air nozzle 1 in this embodiment is 1.2-1.5, the ratio of the area of ​​the primary air nozzle 7 of the rich pulverized coal to the area of ​​the primary air nozzle 8 of the pulverized coal is 0.55-0.8, When the total air volume of the primary air nozzle 1 accounts for 40% to 50% of the total air volume of the boiler, the wind speed of the primary air nozzle 1 is controlled at 24m / s to 30m / s. In this way, when the primary air rate is high, the area of ​​the primary air nozzle is increased on the basis of not increasing the lateral distance of the installation channel of the primary air nozzle 1, and the actual primary air speed is controlled at 24-30m / s. At the same time, a larger area of ​​perimeter air vents on the backfire side can be set to ensure that the primary air jet does not rush to the wall. The air-to-coal ratio in the primary air of the rich pulverized coal ...

specific Embodiment approach 3

[0014] Specific implementation three: as figure 2 As shown, the perimeter wind 9 on the left side of the primary air nozzle 1 in this embodiment is the perimeter wind 9-1 on the backfire side, the perimeter wind 9 on the right side of the primary air nozzle 1 is the perimeter wind 9-2 on the fire side, and the perimeter wind 9 on the backfire side The area of ​​-1 is 3 to 6 times that of the perimeter wind 9-2 on the fire side. Other compositions and connection relationships are the same as in the first or second embodiment.

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Abstract

The invention provides an up-and-down thick-and-thin primary air concentrated distribution type combustion device and relates to a pulverized coal combustion device. The invention aims to solve the problem the NOx discharge concentration of the conventional high primary air rate pulverized coal boiler is difficult to control. A primary air nozzle is provided with at least three layers from top to bottom and is positioned between two layers of fuel oil auxiliary secondary air nozzles; a bottoming secondary air nozzle is arranged below the lower layer of fuel oil auxiliary secondary air nozzle; a compact burnout air nozzle is arranged above the upper layer of fuel oil auxiliary secondary air nozzle; a lower separated burnout air nozzle and an upper separated burnout air nozzle are arranged above the compact burnout air nozzle sequentially; a blunt body is horizontally arranged in the middle of each layer of primary air nozzle; the nozzle on the upper part of the blunt body is a thick pulverized coal primary air nozzle; the nozzle on the lower part of the blunt body is a thin pulverized coal primary air nozzle; a pair of stable combustion teeth are arranged in the thick pulverized coal primary air nozzle; surrounding air is arranged at the periphery of the primary air nozzle. The up-and-down thick-and-thin primary air concentrated distribution type combustion device is applied to high-efficient and low-pollution combustion of the high primary air rate pulverized coal boiler.

Description

technical field [0001] The invention belongs to the tangential combustion technology of a pulverized coal furnace, and particularly relates to a combustion device with concentrated primary air of upper and lower concentration. Background technique [0002] The tangential combustion technology of pulverized coal furnace generally refers to the way in which the air flow of pulverized coal is introduced into the furnace from the once-through burner arranged at the 4 corners (or 6 corners, 8 corners) of the furnace for combustion. Through the coordinated action of the air-powder mixture from all corners, a strong swirling fireball is formed in the furnace to burn. Generally, the primary and secondary air outlets are often arranged at intervals, and the geometric center lines of each air outlet are respectively tangent to one or several imaginary circles in the center. [0003] In this type of boiler, some boilers have insufficient drying capacity due to high moisture content an...

Claims

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Application Information

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IPC IPC(8): F23C5/08F23C7/00
Inventor王正阳杜大全陆宝宽贾凤洋董孝龙陈大生姜志华刘庆威
OwnerBEIJING GUODIAN LONGGAOKE ENVIRONMENT ENG& TECH