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Low-nitrogen oxide discharging coal powder tangential combustion device

A low-NOx, tangential combustion technology, applied in burners, combustion methods, combustion types, etc., can solve problems such as expensive investment and operation and maintenance costs, increase operation regulation performance, strengthen turbulent mixing, and achieve low NOx The effect of emissions

Active Publication Date: 2009-12-09
SHANGHAI BOILER WORKS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Tail flue gas denitrification technology is relatively thorough, but its investment and operation and maintenance costs are expensive

Method used

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  • Low-nitrogen oxide discharging coal powder tangential combustion device
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  • Low-nitrogen oxide discharging coal powder tangential combustion device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] like figure 1 As shown, it is a schematic diagram of a low-NOx emission pulverized coal tangential combustion device, which is suitable for four-corner tangential coal-fired boilers in thermal power plants. Along the furnace height direction, the furnace is divided into main combustion areas according to the characteristics of the pulverized coal combustion area 1, Reduction zone 2 and burnout zone 3. In the main combustion area, the main burner group is composed of multi-layer primary air nozzles 4 and secondary air nozzles 5, which are arranged on the four corners of the furnace. The structure and arrangement of the nozzles are the same as the usual four-corner tangential combustion system, such as image 3 shown, for figure 1 In the middle B-B sectional view, the axis of the primary air nozzle 4 / secondary air nozzle 5 is tangent to an imaginary tangent circle centered on the center of the furnace, and the actual flow will form a swirling airflow in the furnace.

[...

Embodiment 2

[0030] like Figure 4 As shown, it is a schematic diagram of another low-NOx emission pulverized coal tangential combustion device, which is suitable for four-corner tangentially circular coal-fired boilers in thermal power plants. Along the furnace height direction, the furnace is divided into the main combustion area according to the characteristics of the pulverized coal combustion area 1 , reduction zone 2 and burnout zone 3. In the main combustion zone 1, the main burner group is composed of multi-layer primary air nozzles 4 and secondary air nozzles 5, which are arranged on the four corners of the furnace. The structure and arrangement of the nozzles are the same as the usual four-corner tangential combustion system, such as Image 6 shown, for Figure 4 In the middle B-B sectional view, the axes of the primary air nozzle 4 / secondary air nozzle 5 are cut in a circle centered on the center of the furnace, and the actual flow will form a swirling airflow in the furnace. ...

Embodiment 3

[0035] Same as embodiment 2, the difference is that an overburning air nozzle group is arranged on the four walls of the furnace above the primary air nozzle 4 and the secondary air nozzle 5, and the overburning air nozzle 6 is arranged on the center line of each wall. The ratio of the distance h=1800mm between the center of the burn-off air nozzle 6 on each wall of the furnace to the center of the uppermost primary air nozzle 4 and the distance H=18000mm from the center of the uppermost row of primary air nozzle 4 to the bottom of the screen 7 is 0.1: 1. The mass of air passing through the over-combustion air nozzle 6 accounts for 10% of the total combustion air mass of the boiler.

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Abstract

The invention provides a low-nitrogen oxide discharging coal powder tangential combustion device, comprising a hearth; wherein the four corners of a main combustion area of the hearth are provided with primary air spray nozzles and secondary air spray nozzles which are arranged at intervals, and the axis of the primary air spray nozzles or the secondary air spray nozzles positioned on the same horizontal plane is tangential to a supposed tangential circle taking the center of the hearth as a circle center. The low-nitrogen oxide discharging coal powder tangential combustion device is characterized in that the four walls of the hearth above the primary air spray nozzles and the secondary air spray nozzles are provided with at least one burning-out air spray nozzle group; each burning-out air spray nozzle group comprises four burning-out air spray nozzles, one burning-out air spray nozzle is respectively arranged on one wall of the hearth, and the four burning-out air spray nozzles are positioned on the same horizontal plane; and the axis of the burning-out air spray nozzles in the same group are tangential to one supposed tangential circle taking the center of the hearth as a circle center. The invention can realize the low discharging of NOx, solves the problems of high content of fly ash combustible substances caused by a whole air classification technique in a furnace, high fume speed at a hearth outlet, large temperature deviation of the hearth outlet and the like, and increases the running regulation performance aiming at different coal species and load changes simultaneously.

Description

technical field [0001] The invention relates to a tangential combustion device for pulverized coal with low nitrogen oxide emission, belonging to the technical field of combustion devices. Background technique [0002] Nitrogen oxides (NOx, including NO, NO 2 , N 2 O) is a class of gases that can cause serious air pollution and is considered to be one of the main sources of air pollution. Nitrogen oxides from the burning of fossil fuels account for a large proportion of all nitrogen oxide emissions worldwide each year. The increasingly stringent environmental regulations require the research and development of advanced combustion technologies to reduce emissions of pollutants such as NOx. At present, the most important feature of my country's energy composition is coal, accounting for more than 70%, which will produce a large amount of nitrogen oxide gas. Therefore, such an energy structure will have a negative impact on economic and efficient growth and the ecological en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23C7/02
CPCF23C7/02F23D1/00F23C5/32
Inventor 张建文李江涛柳公权陈楠
Owner SHANGHAI BOILER WORKS
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