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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0027] Example 1

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

[0029] (1) Air-drying, crushing, grinding and sieving the straw, the sieving particle size is 0.5mm;

[0030] (2) The pretreated straw is baked at low temperature, under the protection of nitrogen atmosphere, the nitrogen flow rate is 1L / min, the baking temperature is 200℃, the baking time is 30min, and it is cooled to room temperature under nitrogen atmosphere to obtain Carbonized biomass coke, put the carbonized biomass coke into a saturated urea solution, soak for 6 hours at room temperature, and complete the surface ammoniating treatment;

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

Example Embodiment

[0032] Example 2

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

[0034] (1) Air-drying, crushing, grinding and sieving the rice husk, the sieving particle size is 1mm;

[0035] (2) Carry out low-temperature roasting of the pretreated rice husks. Under the protection of the boiler circulating flue gas, the air flow is 1L / min, the roasting temperature is 225℃, the roasting time is 26min, and it is cooled to room temperature under a nitrogen atmosphere. Carbonized biomass coke, put into urea saturated solution, immerse for 12h at room temperature, complete the surface ammoniation treatment;

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

Example Embodiment

[0037] Example 3

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

[0039] (1) Air-dry, crush, grind and siev the wood chips, and the sieving particle size is 1.5mm;

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

[0041] (3) After the ammoniating treatment, it is fully stirred, dried at a low temperature at 50°C, dried 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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