Lignite boiler combustion method capable of reducing nitrogen oxide emission

A nitrogen oxide and boiler combustion technology, which is applied in the field of boiler combustion of lignite, can solve the problems of high operating cost, low denitrification efficiency, and easy slagging of lignite, and achieves the effect of simple structure and high operation reliability

Inactive Publication Date: 2009-07-15
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of slagging that is easy to occur in boilers burning lignite with air staged combustion technology at present, the need for catalysts, huge system investment and high operating cost when using selective ca

Method used

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  • Lignite boiler combustion method capable of reducing nitrogen oxide emission

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Example Embodiment

[0014] Specific implementation mode 1: Combination figure 1 It is explained that the lignite boiler combustion method that can reduce nitrogen oxide emissions in this embodiment adopts a lignite boiler that is divided into a main combustion zone 1 and a burn-out zone 2 from bottom to top. The main combustion zone 1 and the burn-out zone 2 are burned between the main combustion zone 1 and the burn-out zone 2. The full air nozzle 4 is the boundary; during the lignite combustion process, the amino reductant is atomized and sprayed into the main combustion zone 1, burnout zone 2 and horizontal flue 6 in stages; the excess air coefficient of the main combustion zone 1 is controlled by the air distribution to 0.9~ 1. Excess air coefficient in burn-out zone 2 is 1.15~1.2; NH produced by the amino reducing agent injected in main combustion zone 1 3 The molar ratio of nitrogen oxides to the flue gas in the main combustion zone 1 is 0.5~1.1:1; the NH produced by the amino reducing agent inj...

Example Embodiment

[0016] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the amino reducing agent is injected in three stages, and the first stage amino reducing agent is injected from the first-stage reducing agent nozzle or the secondary air nozzle of the burner 3. In the main combustion zone 1, the second-stage amino reducing agent is injected into the burn-out zone 2 from the over-burning air nozzle 4 and / or the furnace flaring angle nozzle 8, and the third-stage amino reducing agent is injected horizontally from the amino reducing agent third-stage nozzle 9 Flue 6. The other steps and parameters are the same as in the first embodiment.

Example Embodiment

[0017] Specific embodiment three: This embodiment is different from specific embodiments one or two in that the excess air coefficient of the main combustion zone 1 is controlled to be 0.95 through the air distribution, and the excess air coefficient of the burn-out zone 2 is 1.16 to 1.17. The other steps and parameters are the same as in the first or second embodiment.

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Abstract

The invention provides a brown coal boiler combustion method capable of reducing discharge of nitrogen oxide and relates to a method for boiler combustion of the brown coal. The method solves the problems that slag bonding is easy to appear in the boiler combustion of the brown coal by adopting air fractional combustion technology, a catalyst is needed, system investment is huge and operating cost is high in the boiler combustion of the brown coal by adopting selective catalytic reduction technology and denitration efficiency is low in the boiler combustion of the brown coal by adopting selective non-catalytic reduction technology. A brown coal boiler with the furnace being divided into a primary combustion zone (1) and a burnout zone (2) from bottom to top is adopted in the brown coal boiler combustion method capable of reducing discharge of nitrogen oxide. An amino group reducer is sprayed grade by grade during the combustion process of the brown coal. By the two methods of the invention, the discharge of the nitrogen oxide can be reduced by more than 60% and the combustion efficiency of the brown coal is up to more than 98%. By the two methods, no slag bonding appears during the combustion of the brown coal, no catalyst is needed and the operating cost is only around 30% of the operating cost of the selective catalytic reduction method.

Description

technical field [0001] The invention relates to a method for burning lignite in a boiler. 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 (0.95 kilograms of nitrogen oxides) directly to the unit that emits pollutants. Therefore, it is necessary to reduce nitrogen while ensuring coal combus...

Claims

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Application Information

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IPC IPC(8): F23B60/00F23N3/00F23L9/00B01D53/56
Inventor 刘辉刘欢鹏王辉朱舒扬焦峰刘敦雨陈建曹庆喜吴少华
Owner HARBIN INST OF TECH
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