Selective non-catalytic reduction method with added gasified biomass gas and used boiler

A technology of biomass and gasification gas, applied in chemical instruments and methods, separation methods, lighting and heating equipment, etc., can solve the problems of low denitrification rate, narrow temperature window, single active ingredient, etc., and achieve simple boiler system, high temperature The effect of wide window and wide distribution

Inactive Publication Date: 2009-05-20
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of narrow temperature window, low denitrification rate in the low temperature region and single effective component in the syngas

Method used

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  • Selective non-catalytic reduction method with added gasified biomass gas and used boiler
  • Selective non-catalytic reduction method with added gasified biomass gas and used boiler
  • Selective non-catalytic reduction method with added gasified biomass gas and used boiler

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Experimental program
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specific Embodiment approach 1

[0010] Specific implementation mode one: combine figure 1 Describe this embodiment, this embodiment includes a body, a burner 4, a panel superheater 7, a high and low temperature superheater 8, a reheater 10, two economizers 12 and two air preheaters 13, the body It is made of a furnace 5, a horizontal flue 9 and a tail flue 11. The outer wall of the furnace 5 is equipped with a burner 4, the panel superheater 7, a high and low temperature superheater 8 and a reheater 10 along the flue The flow direction of the gas in the horizontal flue 9 is installed in the horizontal flue 9 in sequence, and the two economizers 12 and the two air preheaters 13 are arranged at the tail at intervals along the flow direction of the flue gas in the tail flue 11 In the flue 11, the boiler also includes an amino reducing agent solution pipeline 1, a compressed air pipeline 2, a plurality of spray guns 3, a biomass gasification device 14, a pressurizing device 15, a plurality of gas additive injecti...

specific Embodiment approach 2

[0011] Specific implementation mode two: combination figure 1 Describe this embodiment, the selective non-catalytic reduction method of adding biomass gasification gas in this embodiment is as follows: fill the amino reducing agent solution into the amino reducing agent solution pipeline 1, spray the amino reducing agent solution through a plurality of spray guns 3 Into the furnace 5 and the horizontal flue 9 near the refraction angle 6, the temperature range in the furnace 5 and the horizontal flue 9 near the refraction angle is 900 ° C ~ 1100 ° C, and the injection of the amino reducing agent solution is always Amount of NH produced by reducing agent 3 Expressed by the molar ratio of NOx in the flue gas before the reducing agent is injected, NH 3 The molar ratio to NOx in the flue gas is 1.1-1.8; and the amount of the ammonia reductant solution injected into the furnace before the biomass gasification gas is injected is based on the NH produced by the reductant 3 Expresse...

specific Embodiment approach 3

[0012] Specific embodiment three: the difference between this embodiment and specific embodiment two is: the total amount of the injection of the amino reducing agent solution is based on the NH produced by the reducing agent 3 The molar ratio of NOx in the flue gas before the amino reducing agent solution is sprayed is 1.5-1.8. The denitrification efficiency reaches 40-65%.

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Abstract

The invention relates to a selective non-catalytic reduction method with the addition of biomass gasified gas and a boiler used by the same, which relate to the selective non-catalytic reduction method and the boiler used by the same. The invention solves the problems that the prior selective non-catalytic reduction method has narrow temperature window, low denitration efficiency at a low temperature region and single effective component in synthesis gas of a reaction additive. A plurality of spraying ends of a plurality of gas additive spraying devices of the boiler pass through the lateral wall of a horizontal flue and are arranged in the horizontal flue. The selective non-catalytic reduction method pressurizes the biomass gasified gas generated by a biomass gasifier, sprays the pressurized gas into a furnace chamber and a horizontal flue in a region with a temperature of between 800 and 950 DGE C through a biomass gasified gas spaying device, wherein the mol ratio of the total spraying amount of the biomass gasified gas to NOx in the flue gas before the biomass gasified gas is sprayed is between 0.3 and 1.2. The selective non-catalytic reduction method makes use of biomass resources to improve the denitration efficiency and enlarges the temperature window. The boiler system of the invention is simple and has high reliability.

Description

technical field [0001] The invention relates to a selective non-catalytic reduction method and a used boiler. Background technique [0002] Nitrogen oxides (NOx) are one of the main air pollutants emitted by coal-fired boilers. In addition to forming acid rain and destroying the ecological environment, they can also form photochemical smog, which directly endangers human health. 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. It is imminent to control NOx emissions from coal-fired boilers. Currently controlling NO X Emission measures can be roughly divided into two categories, one is low NO X Combustion technology mainly includes low excess air operation technology, flue gas recirculation technology, thick-lean combustion technology and reburning combustion technology, etc. The cost of reburning technology at low NO X It...

Claims

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Application Information

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IPC IPC(8): B01D53/76B01D53/56F23J15/00
Inventor 刘辉邱朋华焦峰王启志朱赟杨运超吴少华
Owner HARBIN INST OF TECH
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