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Hexagonal or octagonal tangential arrangement of anthracite burning single-fireball direct-flow combustors

An octagonal tangent and burner technology, which is applied in the combustion of various fuels, the combustion of block fuel and liquid fuel, the combustion of block fuel and gaseous fuel, etc. Low-level problems, to achieve the effect of being conducive to timely ignition and low-load stable combustion of boilers without fuel injection, reducing secondary air speed, and ensuring timely ignition

Active Publication Date: 2011-08-31
SHANGHAI BOILER WORKS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that since each group of burners 8 is arranged at intervals along the vertical direction with 12 primary air pulverized coal nozzles 5, the heat load q on the wall surface of the burner area in this arrangement Hr Low, can not meet the requirements of anthracite combustion

Method used

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  • Hexagonal or octagonal tangential arrangement of anthracite burning single-fireball direct-flow combustors
  • Hexagonal or octagonal tangential arrangement of anthracite burning single-fireball direct-flow combustors
  • Hexagonal or octagonal tangential arrangement of anthracite burning single-fireball direct-flow combustors

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Effect test

Embodiment 1

[0033] combine image 3 and Figure 5 To describe this embodiment, Figure 4 for image 3 I-I sectional view, image 3 for Figure 4 Section view of II-II.

[0034] The hexagonal or octagonal tangential arrangement of a single fireball DC burner for burning anthracite provided by the present invention includes a boiler body 1, a furnace 2, a coal mill 3, a pulverized coal pipeline 4, a primary air pulverized coal nozzle 5 and a secondary air nozzle 6. Each boiler body 1 is equipped with six coal mills 3, namely the first coal mill A, the second coal mill B, the third coal mill C, the fourth coal mill D, the fifth coal mill E and The sixth coal mill F. The furnace 2 is composed of four water-cooled walls 7, and two sets of burners 8 are arranged on each water-cooled wall 7 of the furnace 2. There are eight sets of burners 8 in total. The two sets of burners 8 on the front wall are 1-1 sets of burners respectively. 8, 1-2 groups of burners 8, the two groups of burners on...

Embodiment 2

[0038] Such as Figure 5 As shown, the difference between this embodiment and Embodiment 1 is that each group of burners 8 is divided into two subgroups up and down, and each group of burners is arranged vertically with three primary air pulverized coal nozzles 5 and four secondary air nozzles 6 . In this way, it is possible to adjust the heat load q on the wall surface of the burner area Hr within a reasonable range to prevent the thermal load due to the wall q Hr Furnace slagging and high temperature corrosion caused by excessively high temperature.

Embodiment 3

[0040] combine Figure 6 and Figure 7 To describe this embodiment, Figure 6 for Figure 7 I-I sectional view, Figure 7 for Figure 6 Section view of II-II.

[0041] The difference between this embodiment and Embodiment 1 is that there are four pulverized coal pipelines 4 at the outlet of each pulverizer 3, and each pulverized coal pipeline 4 passes through a pulverized coal distributor 10 and the adjacent wall of the same elevation on the adjacent wall. Two primary air pulverized coal nozzles 5 are connected, for example, are connected with the primary air pulverized coal nozzles 5 of the 1-1 group of burners 8 arranged on the front wall and the 2-1 groups of burners 8 arranged on the left wall.

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Abstract

The invention provides hexagonal or octagonal tangential arrangement of anthracite burning single-fireball direct-flow combustors, which is characterized in that: two groups of combustors are arranged on each water-cooling wall or two groups of combustors are arranged on two opposite water-cooling walls of a hearth respectively and a group of combustors are arranged on the other two opposite water-cooling walls respectively, each group of combustors are at least divided into a small group; and each small group of combustors are vertically provided with at least two primary air pulverized nozzles and three secondary air pulverized nozzles at intervals. Each coal mill is connected with eight or six primary air pulverized nozzles which have the same level with that of the coal mill. The start and stop of each coal mill affect the running of the eight or six primary air pulverized nozzles which are on the same layer. The hexagonal or octagonal tangential arrangement of the anthracite burning single-fireball direct-flow combustors can decrease the number of the air pulverized nozzles in a single group of combustors on the premise of meeting the requirements of the thermal power of a single air pulverized nozzle and the number of the total air pulverized nozzles, allows the thermal load qHr of a wall in a combustor area to be relatively high, and guarantees the timely ignition of anpulverized anthracite flow and low-load combustion of a boiler without oil.

Description

technical field [0001] The invention relates to a hexagonal or octagonal tangential circle arrangement of a single fireball direct-flow burner for burning anthracite, and belongs to the technical field of pulverized coal combustion devices. Background technique [0002] my country's proven coal reserves are about 640 billion tons, of which low-volatile anthracite accounts for about 14.6% of the total coal reserves. my country's thermal power plants burn anthracite accounts for about 3% of the total coal used for power generation, and this figure is still increasing. Anthracite has low volatile content, low hydrogen content, high ignition temperature, and slow flame propagation speed. If the combustion organization is not good, it is prone to unstable low-load combustion, and when the coal quality deteriorates, the boiler is prone to flameout under high load. Combustion efficiency is also generally lower. [0003] At present, W-flame boilers, four-corner tangential combusti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23C5/32
Inventor 张建文柳公权李江涛肖琨
Owner SHANGHAI BOILER WORKS
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