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Preparation method for nitrided biomass advanced reburning denitration agent and application of nitrided biomass advanced reburning denitration agent

A technology of biomass and denitrification agent, applied in separation methods, chemical instruments and methods, fuels, etc., can solve the problems of narrow temperature window of SNCR technology, difficulty in large-scale utilization of biomass, complicated process, etc., to achieve abundant raw materials and reduce denitrification cost, effects of a wide range of sources

Active Publication Date: 2019-12-06
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems of narrow temperature window, low efficiency, complicated process and difficult large-scale utilization of biomass in SNCR technology, the present invention provides a preparation method and application of nitriding biomass advanced reburning denitrification agent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028]A preparation method of nitriding biomass advanced reburning denitrification agent, comprising the following steps:

[0029] (1) Air-dry, pulverize, grind and sieve the straw for pretreatment, and the sieve particle size is 0.5mm;

[0030] (2) The pretreated straw was roasted at low temperature, under the protection of nitrogen atmosphere, the nitrogen flow rate was continuously introduced at 1L / min, the roasting temperature was 200°C, the roasting time was 30min, and it was cooled to room temperature under nitrogen atmosphere to obtain To carbonize the biomass coke, put the carbonized biomass coke into a saturated urea solution, soak for 6 hours at room temperature, and complete the surface ammoniation treatment;

[0031] (3) After the ammonification treatment, it is fully stirred, dried at a low temperature of 50° C. until the moisture content is lower than 15%, and cooled to room temperature to obtain an advanced reburning denitrification agent for nitriding biomass. ...

Embodiment 2

[0033] A preparation method of nitriding biomass advanced reburning denitrification agent, comprising the following steps:

[0034] (1) carry out air-drying, pulverizing, grinding and sieving pretreatment with rice husk, and the sieving particle diameter is 1mm;

[0035] (2) The pretreated rice husk is roasted at low temperature, under the protection of boiler circulating flue gas, the air flow rate is 1L / min, the roasting temperature is 225°C, and the roasting time is 26min, and it is cooled to room temperature under nitrogen atmosphere to obtain Carbonize biomass coke, put into saturated urea solution, and soak for 12 hours at room temperature to complete the surface ammoniation treatment;

[0036] (3) After the ammonification treatment, it is fully stirred, dried at a low temperature of 50° C. until the moisture content is lower than 15%, and cooled to room temperature to obtain an advanced reburning denitrification agent for nitriding biomass.

Embodiment 3

[0038] A preparation method of nitriding biomass advanced reburning denitrification agent, comprising the following steps:

[0039] (1) Carry out air-drying, pulverizing, grinding and sieving pretreatment to sawdust, and the sieving particle size is 1.5mm;

[0040] (2) drop the pretreated sawdust into an ammonia solution containing 28% ammonia, and immerse it for 18 hours at normal temperature to complete the surface ammonification treatment;

[0041] (3) After the ammonification treatment, it is fully stirred, dried at a low temperature of 50° C. until the moisture content is lower than 15%, and cooled to room temperature to obtain an advanced reburning denitrification agent for nitriding biomass.

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Abstract

The invention belongs to the technical fields of biomass application and boiler flue gas denitration and discloses a preparation method for a nitrided biomass advanced reburning denitration agent andan application of the nitrided biomass advanced reburning denitration agent. The method is mainly used for solving the problems that an SNCR technology is narrow in temperature window, low in efficiency and complicated in process, biomass is difficult in large-scale utilization, and the like. The preparation method for the nitrided biomass advanced reburning denitration agent, disclosed by the invention, comprises the steps: (1) pretreating a biomass raw material; (2) directly carrying out surface ammoniating treatment on the pretreated biomass raw material, or subjecting the pretreated raw material to low-temperature baking so as to obtain charred biomass coke, and carrying out surface ammoniating treatment on the charred biomass coke; and (3) carrying out thorough stirring after the ammoniating treatment, carrying out low-temperature baking, and cooling the temperature of the product to room temperature, thereby obtaining the nitrided biomass advanced reburning denitration agent. A method of application of the nitrided biomass advanced reburning denitration agent comprises the steps of mixing the denitration agent with recirculating flue gas, spraying the mixture into a furnace hearth from the upper part of an afterburning area, and reducing NOx at an outlet of the furnace hearth and in a horizontal flue.

Description

technical field [0001] The invention belongs to the technical field of biomass application and boiler flue gas denitrification, and in particular relates to a preparation method and application of a nitriding biomass advanced reburning denitrification agent. Background technique [0002] Nitrogen oxides (NO x ) seriously damages the ecological environment and threatens human health. Increasingly stringent environmental regulations require research and development of advanced technologies to reduce NO x emissions of pollutants. Currently, control NO x There are two types of emission measures, one is the low NO emission in the process of coal combustion x Combustion technology, the other is flue gas denitrification technology after combustion. [0003] Reburning technology is a more efficient low NO x Combustion technology, put 15-20% of the main fuel above the main combustion zone, consume the oxygen in the flue gas, and use the hydrocarbons formed by incomplete combust...

Claims

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Application Information

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IPC IPC(8): C10L9/10B01D53/81B01D53/56
CPCB01D53/565B01D53/81B01D2257/40B01D2258/0283C10L9/10
Inventor 王菁程芳琴杨凤玲孟江涛王飞
Owner SHANXI UNIV
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