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Four-arch W flame two-stage dense and thin combustion device

A thick-thin combustion and flame technology, which is applied in the direction of using a variety of fuel combustion, combustion methods, combustion types, etc., can solve the problem that the degree of reduction is not particularly obvious, and achieve the effects of uniform heat load distribution, improved fuel reburning efficiency, and large space

Pending Publication Date: 2018-11-06
CHINA SINOGY ELECTRIC ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although the above-mentioned prior art suppresses the formation of NOx to a certain extent, the degree of reduction is not particularly obvious. Therefore, in order to obtain a better low-NOx combustion device, further improvement and optimization of the boiler structure are still needed

Method used

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  • Four-arch W flame two-stage dense and thin combustion device
  • Four-arch W flame two-stage dense and thin combustion device

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Such as Figure 1 ~ Figure 2 A four-arch W flame two-stage thick-lean combustion device shown, wherein figure 1 It is a cross-sectional flow field schematic diagram of the present invention, in which the flow field distribution takes the hearth center line HH' as a plane of symmetry, and the velocity direction of each stream injected into the furnace is marked by arrows in the figure. The hearth of the device includes an upper furnace body 100, a lower furnace body 200 and a cold ash hopper 300, wherein the lower furnace body 200 consists of a front upper furnace arch 1, a rear upper furnace arch 2, a front lower furnace arch 3, and a rear lower furnace arch. Arch 4, front wall 5 and rear wall 6 surround and form;

[0037] A circle of upper throat connection line 7 is formed horizontally on the furnace arch at the junction of the upper furnace body 100 and the lower furnace body 200, the front upper furnace arch 1, the rear upper furnace arch 2, the front lower furnace...

Embodiment 2

[0044] A four-arch W flame two-stage thick-lean combustion device, the rest are the same as embodiment 1, such as Figure 1 ~ Figure 2 As shown, each of the first tuyere groups includes the above-mentioned two rectangular overburned air nozzles 9, two primary exhaust gas nozzles 10, two primary dense coal powder nozzles 11 and four inner secondary air nozzles 12;

[0045] The arrangement order of the two primary dense coal powder nozzles 11 and the four internal secondary air nozzles 12 is, from left to right, an internal secondary air nozzle 12, a primary dense coal powder nozzle 11, and two internal secondary air nozzles. Nozzle 12, a primary dense coal powder nozzle 11 and an inner secondary air nozzle 12;

[0046] Each of the second tuyere groups includes the above-mentioned secondary exhaust gas nozzle 13, a secondary concentrated pulverized coal nozzle 14 and four outer secondary air nozzles 15, and the arrangement order of these nozzles is one from left to right. Outer...

Embodiment 3

[0048] A four-arch W flame two-stage thick-lean combustion device, the rest are the same as embodiment 2, such as Figure 1 ~ Figure 2 As shown, the aspect ratio of the rectangular overburning air nozzle 9 is (2.5-3):1.

[0049] The number of rectangular overburning air nozzles (9) provided on the device is 24 each, and the overburning air rate is 20%. The distance between the rectangular overburning air nozzle 9 and the plane where the upper throat connection line 7 is located is h1 (h1=0.9m).

[0050] The ratio of the primary exhaust gas to the secondary exhaust gas in the device is 3:1, the ratio of the primary concentrated coal powder to the secondary concentrated coal powder is 1.67:1, and the ratio of the internal secondary air to the external secondary air is 5: 2.

[0051] to combine figure 1 with figure 2 , the front lower furnace arch and the rear lower furnace arch are respectively symmetrically distributed with 11 groups of secondary exhaust gas nozzles 13, ou...

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Abstract

The invention relates to the technical field of W flame staged combustion, in particular to a four-arch W flame two-stage dense and thin combustion device. A hearth of the device comprises an upper furnace body, a lower furnace body and a cold ash bucket, wherein the lower furnace body consists of a front upper furnace arch, a rear upper furnace arch, a front lower furnace arch, a rear lower furnace arch, a front wall and a rear wall bag. The four-arch W flame two-stage dense and thin combustion device has the beneficial effects that the ignition is stable, the space between the two sides of the jet flow of the two-stage combustor becomes large, the gas supplementing condition is good, the backflow of high-temperature flue gas is facilitated, the combustion is stable, and the heat load distribution is uniform; secondary air, dense coal powder and thin coal powder are subjected to layered injection and staged combustion after entering the hearth, so that the partial-stage concentrated community in the hearth is formed, and the air flow of the pulverized coal is reduced, the two-stage "thin-dense-dense and thin mixing" layered arrangement mode of coal power airflow is achieved, the mode of the single-layer combustor is further enhanced; and the high-efficiency low-NOx double-stage combustor and the air staged combustion technology are combined, so that the fuel reburning efficiency is improved and the emission of NOx is reduced.

Description

technical field [0001] The invention relates to the technical field of W flame staged combustion, in particular to a four-arch W flame two-stage thick-thin combustion device. Background technique [0002] W-flame boilers have obvious advantages when burning low-volatile coals such as anthracite and low-quality lean coal, and are not restricted by large-scale boiler capacity, and can greatly save energy, so they have been widely used. However, in the combustion process of W flame boilers, there are generally problems such as poor pulverized coal burnout, easy flameout under low load, poor combustion stability, and high NOx emissions. [0003] The Chinese invention patent with the application number "201010149634.5", the authorized announcement number "CN 101832549 B", and the title "Multiple injection staged combustion method" discloses a method for reducing NOx emissions. Between the front wall and the water wall, there are primary air nozzles (concentrated coal powder flow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23C5/08
CPCF23C5/08Y02E20/34
Inventor 李路谷丽景李翔尹建兴杜延彬兰文英霍利团
Owner CHINA SINOGY ELECTRIC ENG
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