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Central powder-feeding omega-shaped industrial pulverized coal boiler adopting flue gas recirculation

A flue gas recirculation, pulverized coal boiler technology, applied in the direction of block/powder supply/distribution, combustion method, fuel supply, etc., can solve the problems of high NOx emission, difficult maintenance, complex structure, etc., to reduce The effect of NOx generation, prolongation of residence time, and increase of pulverized coal concentration

Active Publication Date: 2018-01-19
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 high NOx emission, poor burnout and complex structure and difficult maintenance of existing industrial pulverized coal boilers, the present invention further proposes a center-feeding "Ω"-shaped industrial pulverized coal boiler that adopts flue gas recirculation

Method used

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  • Central powder-feeding omega-shaped industrial pulverized coal boiler adopting flue gas recirculation

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specific Embodiment approach 1

[0021] Specific implementation mode one: combine figure 1 To illustrate this embodiment, a center-feeding "Ω" shaped industrial pulverized coal boiler using flue gas recirculation described in this embodiment includes a swirling pulverized coal burner 1, a wind powder system 2 and a boiler body 3, and the swirling coal Powder burner 1 includes primary air duct 5, DC secondary air duct 6, swirling inner secondary air duct 7 and swirling outer secondary air duct 8, air powder system 2 includes recirculation flue gas duct 15 and pulverized coal duct 22. The primary air duct 5, the DC secondary air duct 6, the swirl inner secondary air duct 7 and the swirl outer secondary air duct 8 are arranged in sequence from the inside to the outside. The outlet end of the recirculation flue gas pipe 15 is connected to the inlet end of the direct current secondary air pipe 6, the secondary air pipe 7 inside the swirl flow and the secondary air pipe 8 outside the swirl flow respectively, and th...

specific Embodiment approach 2

[0022] Specific implementation mode two: combination figure 1 To illustrate this embodiment, the boiler body 3 in this embodiment includes a horizontal furnace 19, an ascending furnace 20, and a descending furnace 21, the horizontal furnace 19, the ascending furnace 20, and the descending furnace 21 are arranged in sequence from front to back, and the ascending furnace 20 and the descending furnace 21 are arranged along the vertical direction, the boiler front wall 4 is arranged at the front end of the horizontal furnace 19, the lower end of the ascending furnace 20 is connected with the rear end of the horizontal furnace 19, the upper end of the ascending furnace 20 is connected with the upper end of the descending furnace 21, and the descending furnace 21 The lower end of the furnace is provided with a horizontal section 21-1, and the end of the horizontal section 21-1 is arranged on the rear side of the descending furnace 21. The undisclosed technical features in this embod...

specific Embodiment approach 3

[0023] Specific implementation mode three: combination figure 1 This embodiment will be described. The primary air duct 5 , the DC secondary air duct 6 , the secondary air duct 7 inside the swirl flow, and the secondary air duct 8 outside the swirl flow described in this embodiment are arranged coaxially. The undisclosed technical features in this embodiment are the same as those in the first or second specific embodiment.

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Abstract

The invention provides a central powder-feeding omega-shaped industrial pulverized coal boiler adopting flue gas recirculation and relates to the technical field of an industrial pulverized coal boiler. The problems that the existing industrial pulverized coal boiler is high in NOx discharge quantity, poor in burnout and high in structural complex maintenance difficulty are solved. The central powder-feeding omega-shaped industrial pulverized coal boiler adopting flue gas recirculation comprises a rotational flow pulverized coal combustor, a wind powder system and a boiler body; a primary airpipe, a direct-flow secondary air pipe, a rotational flow inner secondary air pipe and a rotational flow outer secondary air pipe are arranged sequentially from inside to outside; the inlet end of theprimary air pipe is connected with the outlet end of a pulverized coal pipeline; the outlet end of a recirculation flue gas pipeline is connected with the inlet ends of the direct-flow secondary airpipe, the rotational flow inner secondary air pipe and the rotational flow outer secondary air pipe separately; the outlet ends of the primary air pipe, the direct-flow secondary air pipe, the rotational flow inner secondary air pipe and the rotational flow outer secondary air pipe are connected with a nozzle of the rotational flow pulverized coal combustor respectively; and the boiler body is arranged in the form of a horizontal omega shape. The central powder-feeding omega-shaped industrial pulverized coal boiler adopting flue gas recirculation is applied to the industrial pulverized boiler.

Description

technical field [0001] The invention relates to the technical field of industrial pulverized coal boilers, in particular to a center-feeding "Ω"-shaped industrial pulverized coal boiler adopting flue gas recirculation. Background technique [0002] In my country, coal-fired industrial boilers are the main coal-consuming equipment except power plant boilers, with a total of nearly 600,000 units and an annual coal consumption of nearly 640 million tons. The main problems of coal-fired industrial boilers in my country: (1) The actual average thermal efficiency is mostly around 65%, while the thermal efficiency of developed countries generally reaches more than 90%; (2) Pollutant discharge exceeds the standard, generally failing to meet national and local emission standards , Coal-fired industrial boilers produce about 2 million tons of NOx every year, second only to coal-fired power plant boilers. [0003] The National Ministry of Environmental Protection promulgated the "Boile...

Claims

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Application Information

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IPC IPC(8): F23C9/06F23C6/04F23K3/02
Inventor 陈智超严蓉李鑫曾令艳李争起
Owner HARBIN INST OF TECH
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