Method of decreasing release of nitrogen oxide in the pulverized-coal fired boiler and its used boiler

A nitrogen oxide, pulverized coal boiler technology, applied in the field of boilers, can solve the problems of low denitrification rate and high operation cost, and achieve the effect of high denitrification rate and low operation cost

Inactive Publication Date: 2007-08-22
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the invention is to solve the problem of reducing NO in pulverized coal boilers at present. X The emission measures have the problems of hi

Method used

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  • Method of decreasing release of nitrogen oxide in the pulverized-coal fired boiler and its used boiler

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specific Embodiment approach 1

[0008] Specific Embodiment 1: This embodiment is described in conjunction with FIG. 1. This embodiment is divided into a main combustion zone 8, a reduction zone 9, a burnout zone 10, an area near the burner 8-1, a horizontal flue 11 and a tail flue 17. The pulverized coal boiler; the amino reducing agent is sprayed into the reduction zone 9, the burnout zone 10 and the horizontal flue 11; the hydrocarbon-based reducing agent is sprayed into the main combustion zone 8 and the reduction zone 9 or the main combustion zone 8, The reduction zone 9 and the horizontal flue 11; the area near the burner 8-1 is an oxidizing atmosphere, and the excess air coefficient at the outlet of the main combustion zone 8 is controlled by air distribution to 0.8-0.95, and the excess air coefficient at the outlet of the reduction zone 9 is 0.9-1 , The excess air coefficient at the outlet of the burnout zone 10 is 1.15 to 1.2; the total amount of injection of the amino reducing agent is 1 to 1.6 times...

specific Embodiment approach 2

[0010] Specific embodiment two: this embodiment is described in conjunction with Fig. 1, and the difference between this embodiment and specific embodiment one is: the amino reducing agent is injected in three stages, and the first stage amino reducing agent is injected from the primary burn-off air nozzle 4 or The primary nozzle 6-1 of the amino reducing agent is sprayed into the reduction zone 9; the second-level amino reducing agent is sprayed into the burnout zone 10 from the secondary burn-off air nozzle 5 or the secondary nozzle 6-2 of the amino reducing agent; The reducing agent is sprayed into the horizontal flue 11 from the third-stage nozzle 6-3 of the amino reducing agent; the injection amount of the first-stage amino reducing agent is 20% to 40% of the total injection amount of the amino reducing agent, and the second-stage amino reducing agent The injected amount of the amino reducing agent is 20%-40% of the total injected amount of the amino reducing agent, and th...

specific Embodiment approach 3

[0011] Specific embodiment three: This embodiment is described in conjunction with Fig. 1. The difference between this embodiment and specific embodiment two is: the first-stage amino reducing agent is sprayed into the reduction zone 9 from the primary over-burning air nozzle 4; the second-stage amino The reducing agent is sprayed into the burnout zone 10 from the secondary burnout air nozzle 5 . Others are the same as the second embodiment.

[0012] In this embodiment, the amino reducing agent enters the furnace through the overburning air nozzle, which can improve the mixing effect of the amino reducing agent and the furnace flue gas, and is beneficial to improve the denitrification rate.

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Abstract

The present invention relates to a method capable of reducing nitrogen oxide discharge for coal powder boiler and boiler using said method. Said invention is characterized by that said boiler is composed of boiler furnace cavity, horizontal flue and tail flue, and the furnace cavity interior is divided into main combustion zone, reduction zone and burning zone. The method for reducing discharge adopts the coal powder boiler with main combustion zone, reduction zone, burning zone, near combustor zone, horizontal flue and tail flue, makes the amino reducing agent be sprayed into reduction zone, burning zone and horizontal flue and make the hydrocarbyl reducing agent be sprayed into main combustion zone and reduction zone or main combustion zone, reduction zone and horizontal flue. Said method can effectively reduce NOx discharge by 60%-80%.

Description

technical field [0001] The invention relates to a method for reducing boiler pollutant discharge and a boiler used therein. Background technique [0002] Nitrogen oxides (NO X ) is one of the main air pollutants emitted by coal-fired boilers. In addition to forming acid rain and destroying the ecological environment, nitrogen oxides can also form photochemical smog, which directly endangers human health. At present, nitrogen oxides have become an air pollutant second only to sulfur dioxide in my country, and their impact on acid rain, air quality and ground ozone concentration is increasing. On January 1, 2004, the new "Emission Standard of Air Pollutants for Thermal Power Plants" (GB13223-2003) was implemented, which is more stringent than the previous standard. Since July 1, 2004, the state has charged 0.6 yuan per pollution equivalent of nitrogen oxides (the equivalent of nitrogen oxides is 0.95 kilograms) to directly charge the units that emit pollutants. Control coal...

Claims

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Application Information

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IPC IPC(8): F23J15/02
Inventor 刘辉吴少华杜谦李争起秦裕琨
Owner HARBIN INST OF TECH
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