CN110540887B - Preparation method and application of nitridized biomass advanced reburning denitration agent - Google Patents

Preparation method and application of nitridized biomass advanced reburning denitration agent Download PDF

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CN110540887B
CN110540887B CN201910849937.9A CN201910849937A CN110540887B CN 110540887 B CN110540887 B CN 110540887B CN 201910849937 A CN201910849937 A CN 201910849937A CN 110540887 B CN110540887 B CN 110540887B
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biomass
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denitration agent
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CN110540887A (en
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王菁
程芳琴
杨凤玲
孟江涛
王飞
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Shanxi University
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/54—Nitrogen compounds
    • B01D53/56—Nitrogen oxides
    • B01D53/565—Nitrogen oxides by treating the gases with solids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/81—Solid phase processes
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L9/00—Treating solid fuels to improve their combustion
    • C10L9/10—Treating solid fuels to improve their combustion by using additives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/40—Nitrogen compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/02—Other waste gases
    • B01D2258/0283—Flue gases

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Abstract

The invention belongs to the technical field of biomass application and boiler flue gas denitration, and discloses a preparation method and application of a nitridized biomass advanced reburning denitration agent. The invention mainly solves the problems of narrow temperature window, low efficiency, complex process, difficult large-scale utilization of biomass and the like of the SNCR technology.The preparation method of the advanced reburning denitration agent for nitriding biomass comprises the following steps: (1) pretreating a biomass raw material; (2) directly carrying out surface ammoniation treatment on the pretreated biomass raw material, or baking the pretreated raw material at low temperature to obtain carbonized biomass coke, and carrying out surface ammoniation treatment on the carbonized biomass coke; (3) and fully stirring, drying at low temperature and cooling to room temperature after ammoniation treatment to obtain the nitridized biomass advanced reburning denitrifier. The application method of the invention comprises the following steps: mixing the denitrifier with the recirculated flue gas, spraying into the hearth from the upper part of the burnout zone, and reducing NO in the hearth outlet and the horizontal fluex。

Description

Preparation method and application of nitridized biomass advanced reburning denitration agent
Technical Field
The invention belongs to the technical field of biomass application and boiler flue gas denitration, and particularly relates to a preparation method and application of a nitridized biomass advanced reburning denitration agent.
Background
Nitrogen Oxides (NO)x) The ecological environment is seriously damaged, and the human health is threatened. Increasingly stringent environmental regulations require the development of advanced technologies to reduce NOxAnd the like. Currently, control of NOxThere are two broad categories of emissions measures, one being low NO during coal combustionxThe combustion technology, and the other is the flue gas denitrification technology after combustion.
The reburning technology is a high-efficiency low NOxThe combustion technology is that 15-20% of main fuel is placed above main combustion zone, oxygen in flue gas is consumed, and under the condition of that excess air coefficient is less than 1, the hydrocarbon formed by incomplete combustion is used to make NOxReduction to N2. The reburning technology changes the burning mode in the hearth, the denitration effect is limited by the fuel property, and the incomplete burning loss is large. The SNCR technology is a typical flue gas denitration technology, does not need a catalyst, has the operation cost far lower than that of SCR, has short construction period and is easy to modify. However, the SNCR reaction temperature window is narrow (900 ℃ -1100 ℃), and NH is generated when the temperature is higher than 1100 DEG C3Is oxidized to NOxAt temperatures below 900 ℃ limited by OH, NH3With NOxThe reaction rate of (2) is very low. In practical application, because the temperature in the flue is rapidly reduced, the temperature gradient is large, the retention time is limited, and the injected reducing agent is difficult to have the effect with the flue gasEffect mixing and abundant reaction, actual denitration efficiency often can only reach 30 ~ 50%. In addition, because of insufficient reaction, incompletely reacted ammonia remains in the tail gas, high ammonia leakage is formed, a flue is easily corroded, and secondary pollution is caused.
In order to further improve the denitration efficiency, the reburning technology is combined with the SNCR technology to form an advanced reburning technology, and the technology can improve the denitration efficiency by spraying the amino reducing agent into a reburning area. The utility model with patent publication number CN 1387006A discloses a method and a device for reducing nitrogen oxide emission of a coal-fired boiler, and the method provides staged combustion of main fuel, improves reburning, and injects a promoter and a nitrogen agent into a reburning area to improve the denitration effect. However, the combustion mode influence generated by fuel classification still exists, and the accelerant used in the method is sodium hydroxide powder or solution, and natural gas is used as reburning gas, so that the denitration cost is increased. In patent application CN 101244361 a and CN 101433799 a, ultrafine coal powder, natural gas and biomass gasified gas are respectively used as promoters for SNCR reaction, although the reaction temperature window can be reduced to different degrees, burnout of ultrafine coal powder is difficult to guarantee, the natural gas and biomass gasified gas device process is complicated, and it is difficult to ensure sufficient mixing of reburning fuel as promoter and amino reducing agent, and it is difficult to control ammonia escape to a very low level.
The biomass has low sulfur, low nitrogen, high volatile matter, high coke ash activity and zero CO2Clean discharge and the like. According to measurement and calculation, the total amount of biomass energy resources which can be developed in China is about 10 hundred million tons of standard coal per year in a long term, and the biomass energy resources are abundant in quantity and various in variety. However, biomass has the defects of high water content, low energy density, easy decay, unsuitability for long-term storage and long-distance transportation and the like, so that the large-scale utilization of the biomass is limited. Therefore, how to combine the characteristics of biomass and effectively combine biomass energy utilization with flue gas pollutant control is an urgent problem to be solved in the current energy environment field.
Some methods in the prior art use biomass as an adsorbent after carbonization treatment. For example, patent CN 103406096 a discloses a nitrogen-doped porous carbon material and a preparation method thereof,the nitrogen-doped porous carbon material prepared under the hydrothermal condition has good adsorption performance on hydrogen and carbon dioxide. But the process requirement is high and complex, the method is not suitable for large-scale production, and the prepared material has lower adsorption efficiency at high temperature and lower selective adsorption value of a specific target adsorbate. Patent CN 104525110 a discloses a nitrogen-rich active biomass coke and a preparation method thereof, which obtains the nitrogen-rich active coke with excellent structure and surface physicochemical properties by carbonizing and pyrolyzing biomass and activating the biomass in the atmosphere of water vapor and ammonia gas. Both methods use biomass for the production of a gas for the adsorption of acid gases such as CO2、SO2And NOxThe adsorbent is used in the front section of chimney of fume emission source in coal burning power plant at 110-160 deg.c. Patent CN 103525502A discloses a coal-fired power plant boiler biomass reburning denitration agent, which reduces the moisture content of biomass through a series of processes, improves the heat value and energy density of the biomass, and promotes the biomass to be used as the reburning denitration agent to carry out NO treatment on flue gas through dipping alkali metal salt solution and mechanically mixing urea and ferric oxidexThe same phase and different phase reduction of the biomass carbon powder is carried out to prepare the composite biomass carbon powder consisting of the impregnated biomass carbon powder and the additive particles. In the technology, the biomass is only used as reburning fuel after being treated and is mixed with solid urea, so that the promotion effect of the biomass on the SNCR reaction is difficult to fully exert. Patent CN 101721904 a discloses a method for direct reburning of biomass and selective non-catalytic reduction loaded denitration, which comprises mixing biomass particles with primary air and recirculated flue gas, spraying the mixture into a reburning reduction zone, and spraying an amino reducing agent and an additive into a burnout zone and a horizontal flue by using the recirculated flue gas. The technology is simple, the biomass is directly used as the reburning fuel, no treatment is carried out, the problems of low water content and low energy density in the biomass cannot be solved, and the mixing with the amino reducing agent cannot be guaranteed.
Disclosure of Invention
Aiming at the problems of narrow temperature window, low efficiency, complex process, difficult large-scale utilization of biomass and the like of the SNCR technology, the invention provides a preparation method and application of a nitridized biomass advanced reburning denitrifying agent.
In order to achieve the purpose, the invention adopts the following technical scheme:
a preparation method of a nitridized biomass advanced reburning denitration agent comprises the following steps:
(1) pretreating a biomass raw material;
(2) directly carrying out surface ammoniation treatment on the pretreated biomass raw material, or baking the pretreated biomass raw material at low temperature to obtain carbonized biomass coke, and carrying out surface ammoniation treatment on the carbonized biomass coke;
(3) and fully stirring, drying at low temperature and cooling to room temperature after ammoniation treatment to obtain the nitridized biomass advanced reburning denitrifier.
The biomass raw material in the step (1) is straw, rice hull, wood chip or corncob and the like. The biomass raw materials have low sulfur, low nitrogen, high volatile matter, high coke ash activity and zero CO2The clean emission and the like are excellent reburning fuel, and the promotion effect on SNCR is due to the coal dust which is easier to burn out than the coal dust; alkali metal elements in the biomass can catalyze the SNCR reaction, so that the SNCR denitration efficiency is further improved. In addition, the biomass is abundant in various places in China, is cheap and easy to obtain, can consume a large amount of biomass waste through the technology, and simultaneously realizes effective utilization of biomass energy.
The pretreatment method in the step (1) comprises the following steps: the biomass raw material is dried, crushed, ground and screened, and the selected particle size range of the screening is 0.5-2 mm. The biomass has the defects of high water content, low energy density, easy decay and the like, and the large-scale utilization of the biomass is limited. Before the biomass fuel is used as fuel, the biomass must be air-dried, so that the moisture and volume of the raw material are reduced, and the grinding treatment is convenient. Through grinding and screening, the particle size of the raw material is controlled to be 2-0.5mm, so that the specific surface area of the material in contact with the additive solution in the ammoniation stage can be increased, the ammoniation efficiency is improved, and the denitration agent can be fully mixed with the flue gas after entering the furnace, so that the reaction efficiency is improved.
The specific method for performing surface ammoniation treatment in the step (2) comprises the following steps: spraying the biomass for 1-2 hours or dipping the biomass for 6-24 hours by using the additive solution. The spraying time of the additive solution is determined according to the concentration of NOx in the flue gas. Through spraying and ammonia agent solution, the biomass and the ammonia agent are fully combined and enter the furnace together, the problem that the liquid ammonia agent and the solid biomass furnace are not contacted fully in the traditional biomass advanced reburning process is solved, the using amount of the ammonia agent is reduced, and the ammonia escape is reduced.
The low-temperature baking conditions in the step (2) are as follows: under the protection of nitrogen or boiler circulating flue gas atmosphere, the baking temperature is 200-300 ℃, and the baking time is 20-30 min. The biomass is baked at low temperature in inert atmosphere and is subjected to mild pyrolysis, the quality of the biomass is improved, the water content, the C/H ratio and the O/C ratio are reduced after baking, the porosity and the specific surface area are greatly improved, the heat value and the energy density are increased, and the ammonification efficiency and the combustion efficiency after charging are improved. And the boiler circulating flue gas is adopted to replace nitrogen, so that the process cost can be reduced.
The additive solution in the surface ammoniation treatment in the step (2) is as follows: saturated solution of urea or ammonia solution with concentration of 25-28%. The use of the additive solution with higher concentration improves the ammoniation efficiency, reduces the ammoniation time and reduces the volume of the liquid storage tank.
And (4) drying at low temperature in the step (3), wherein the waste heat of a boiler is used for drying, the drying temperature is 50 ℃, and the drying is carried out until the water content is lower than 15%. The ammoniated material has large water content and must be dried, so that the energy density of the material is improved and the requirement of entering a furnace is met; because ammonia water and urea are volatile, the drying temperature must be controlled below 50 ℃, and the loss of ammonia agent in drying is reduced; and the waste heat of the boiler is adopted, so that the energy consumption of the process is reduced, and the cost is reduced.
The application of the nitriding biomass advanced reburning denitration agent is characterized in that the nitriding biomass advanced reburning denitration agent is applied to denitration of flue gas of a coal-fired boiler, and the specific application method comprises the following steps:
mixing the nitridized biomass firstly-reburning denitrifier particles with the recirculated flue gas, and spraying the mixture into a hearth from the upper part of a burnout zone at the temperature of 850-xReacting in the furnace outlet and flue to generate N2。
Compared with the prior art, the invention has the following advantages:
1. the combination of the reburning technology and the SNCR technology can obviously improve the denitration efficiency, effectively reduce the dosage of the amino reducing agent required when the SNCR technology is used alone, reduce the denitration cost and reduce the ammonia escape.
2. The biomass raw material is rich and has wide sources, and the utilization rate of the biomass resource is greatly improved; the efficient and cheap denitration agent is prepared by utilizing biomass renewable resources, so that the problem of incomplete fuel combustion caused by taking 15% of main fuel as reburning fuel in the traditional reburning technology is solved; the double effects of biomass energy utilization and environmental protection are realized.
3. The biomass is fully contacted with the amino reducing agent, and then the circulating flue gas is sprayed into the outlet area of the hearth, so that the mixing degree of reactants can be enhanced, the SNCR reaction rate is improved, and the ammonia leakage is reduced; and can avoid the reduction of denitration efficiency caused by overhigh oxygen concentration in the SNCR reaction zone.
4. Alkali metal elements in the biomass are gasified, the number of OH groups in an SNCR reaction zone is increased through the alkali metal elements, and the removal of NO by SNCR is improvedxThe purpose of efficiency.
5. The advanced reburning denitration agent has wide application range, and can be applied to various boiler flues, such as power station boilers, waste incineration boilers, coke ovens and the like; while denitrating, the method can also assist in removing SO in the flue gas2And the like.
Detailed Description
Example 1
A preparation method of a nitridized biomass advanced reburning denitration agent comprises the following steps:
(1) carrying out air drying, crushing, grinding and screening pretreatment on the straws, wherein the screening particle size is 0.5 mm;
(2) baking the pretreated straws at a low temperature, continuously introducing nitrogen at a flow rate of 1L/min under the protection of nitrogen atmosphere, baking at a temperature of 200 ℃ for 30min, cooling to room temperature under the protection of nitrogen atmosphere to obtain carbonized biomass coke, adding the carbonized biomass coke into a urea saturated solution, and soaking at the normal temperature for 6h to finish surface ammoniation treatment;
(3) fully stirring the mixture after ammoniation treatment, drying the mixture at low temperature of 50 ℃ until the water content is lower than 15%, and cooling the mixture to room temperature to obtain the nitridized biomass advanced reburning denitrifier.
Example 2
A preparation method of a nitridized biomass advanced reburning denitration agent comprises the following steps:
(1) carrying out air drying, crushing, grinding and screening pretreatment on the rice hulls, wherein the screening particle size is 1 mm;
(2) baking the pretreated rice hulls at low temperature, under the protection of circulating flue gas of a boiler, enabling the gas flow to be 1L/min, the baking temperature to be 225 ℃, enabling the baking time to be 26min, cooling to room temperature under the atmosphere of nitrogen to obtain carbonized biomass coke, adding a urea saturated solution, and soaking for 12h at room temperature to finish surface ammoniation treatment;
(3) fully stirring the mixture after ammoniation treatment, drying the mixture at low temperature of 50 ℃ until the water content is lower than 15%, and cooling the mixture to room temperature to obtain the nitridized biomass advanced reburning denitrifier.
Example 3
A preparation method of a nitridized biomass advanced reburning denitration agent comprises the following steps:
(1) carrying out air drying, crushing, grinding and screening pretreatment on sawdust, wherein the screening particle size is 1.5 mm;
(2) putting the pretreated wood chips into an ammonia water solution containing 28% of ammonia, and soaking for 18h at normal temperature to finish surface ammoniation treatment;
(3) fully stirring the mixture after ammoniation treatment, drying the mixture at low temperature of 50 ℃ until the water content is lower than 15%, and cooling the mixture to room temperature to obtain the nitridized biomass advanced reburning denitrifier.
Example 4
A preparation method of a nitridized biomass advanced reburning denitration agent comprises the following steps:
(1) carrying out air drying, crushing, grinding and screening pretreatment on the corncobs, wherein the screening particle size is 2 mm;
(2) uniformly spraying the prepared ammonia water solution containing 25% of ammonia for 1h on the pretreated corncobs, and soaking for 20h at normal temperature to finish surface ammoniation treatment;
(3) fully stirring the mixture after ammoniation treatment, drying the mixture at low temperature of 50 ℃ until the water content is lower than 15%, and cooling the mixture to room temperature to obtain the nitridized biomass advanced reburning denitrifier.
Example 5
A preparation method of a nitridized biomass advanced reburning denitration agent comprises the following steps:
(1) carrying out air drying, crushing, grinding and screening pretreatment on the straws, wherein the screening particle size is 2 mm;
(2) baking the pretreated straws at low temperature, continuously introducing nitrogen at the flow rate of 1L/min under the protection of nitrogen atmosphere, baking at the temperature of 300 ℃ for 20min, cooling to room temperature under the protection of nitrogen atmosphere to obtain carbonized biomass coke, uniformly spraying the prepared ammonia water solution containing 26% of ammonia for 2h on the carbonized biomass coke raw material, and soaking at normal temperature for 24h to finish surface ammoniation treatment;
(3) fully stirring the mixture after ammoniation treatment, drying the mixture at low temperature of 50 ℃ until the water content is lower than 15%, and cooling the mixture to room temperature to obtain the nitridized biomass advanced reburning denitrifier.
Example 6
A preparation method of a nitridized biomass advanced reburning denitration agent comprises the following steps:
(1) carrying out air drying, crushing, grinding and screening pretreatment on the corncobs, wherein the screening particle size is 1 mm;
(2) uniformly spraying the prepared ammonia water solution containing 27% of ammonia for 1.5h on the pretreated corncobs, and soaking for 10h at normal temperature to finish surface ammoniation treatment;
(3) fully stirring the mixture after ammoniation treatment, drying the mixture at low temperature of 50 ℃ until the water content is lower than 15%, and cooling the mixture to room temperature to obtain the nitridized biomass advanced reburning denitrifier.
Example 7
The invention discloses application of a nitridized biomass advanced reburning denitration agent in flue gas denitration of a coal-fired boiler, which comprises the following steps:
in the pulverized coal boiler of a power station mainly comprising a tangential boiler, the temperature from a reburning area to a hearth outlet is generally 900-1400 ℃, the atmosphere is mostly in an oxygen-deficient state, the reaction is suitable for SNCR reaction, and meanwhile, the position with the temperature lower than 1000 ℃ in a horizontal flue behind the hearth is also suitable for SNCR reactionShould be used. Therefore, the nitrided biomass particles are mixed with the recirculated flue gas, and are sprayed into the hearth from the upper part of the hearth burnout zone of the pulverized coal fired boiler at the temperature of 850-. After the nitridized biomass enters the reaction zone, part of nitrogen is NH3The form is volatilized, and part of the form can be bonded with C-N bonds on the surface of the coke. Released NH3SNCR reactions may occur when the biomass pair NOxThe reduction action of the catalyst is similar to the advanced reburning reaction of biomass, so that part of NO formed in the main burning zonexReacting in the hearth outlet and the horizontal flue to generate N2。
In the advanced reburning process, the biomass mainly plays two promoting roles: on the one hand, the biomass is used as a reburning fuel, and NO can be directly introducedxReduction to N2(ii) a On the other hand, the biomass is used as an additive to promote NH in the SNCR reaction process2Generation of reactive groups to accelerate NO by ammoniacal agentxReduction of (2).
The reburning action includes two aspects: firstly, reducing NO generated from a main combustion zone, wherein the process mainly occurs in a reducing atmosphere with a moderate excess air coefficient and comprises in-phase and out-phase effects; secondly, the interaction between N substances is directly converted into N2The main form of the process is to prevent the further generation of NO, and the process needs the direct participation of the fuel N and mainly takes the same phase action.
The co-phasing refers to the presence of gaseous species (CnHm, HCN, NHi, etc.) and NO in a reducing atmospherexA reaction between them; CO and H generated during pyrolysis and combustion of fuels2And can also participate in the co-phase reduction. The heterogeneous reaction mainly aims at C-containing solid fuel, and the decomposition of NO on the coke surface occurs, and comprises two parallel reactions:
2NO+2C—N2+2CO
C+2NO—CO2+N2
after nitriding and ammoniation treatment, nitrogen atoms can permeate into crystal lattices of carbon to form nitrogen-containing functional groups which can continuously and stably exist, and then directly participate in NO reaction at high temperature to form N2。
In addition, the biomass is used as an accelerator of SNCR, promotes generation of OH free radicals at a lower temperature, and further promotes NH2Generation of reactive groups, ultimately contributing to NO/O2/NH3Self-acceleration in between. HCN and NHi converted from biomass fuel N and Chi, HCN and NHi in volatile matters are main factors for reducing NO, and the biomass with high volatile matters and high N content is more beneficial to promoting the reduction of NO.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (6)

1. A preparation method of a nitridized biomass advanced reburning denitration agent is characterized by comprising the following steps: the method comprises the following steps:
(1) pretreating a biomass raw material;
(2) directly carrying out surface ammoniation treatment on the pretreated biomass raw material, or baking the pretreated biomass raw material at low temperature to obtain carbonized biomass coke, and carrying out surface ammoniation treatment on the carbonized biomass coke;
(3) fully stirring, drying at low temperature and cooling to room temperature after ammoniation treatment to obtain a nitriding biomass advanced reburning denitrifier;
the specific method for performing surface ammoniation treatment in the step (2) comprises the following steps: spraying the biomass for 1-2 hours or dipping for 6-24 hours by using an additive solution;
the additive solution in the step (2) is as follows: saturated solution of urea or ammonia solution with concentration of 25-28%.
2. The method for preparing the nitridized biomass advanced reburning denitration agent according to claim 1, wherein the method comprises the following steps: the biomass raw material in the step (1) is straw, rice hull, wood chip or corncob.
3. The method for preparing the nitridized biomass advanced reburning denitration agent according to claim 1, wherein the method comprises the following steps: the pretreatment method in the step (1) comprises the following steps: the biomass raw material is dried, crushed, ground and screened, and the selected particle size range of the screening is 0.5-2 mm.
4. The method for preparing the nitridized biomass advanced reburning denitration agent according to claim 1, wherein the method comprises the following steps: the low-temperature baking conditions in the step (2) are as follows: under the protection of nitrogen atmosphere or boiler circulating flue gas, the temperature is 200-300 ℃, and the time is 20-30 min.
5. The method for preparing the nitridized biomass advanced reburning denitration agent according to claim 1, wherein the method comprises the following steps: and (4) drying at low temperature in the step (3), wherein the waste heat of a boiler is used for drying, the drying temperature is 50 ℃, and the drying is carried out until the water content is lower than 15%.
6. The application of the nitriding biomass advanced reburning denitration agent prepared by the preparation method of the nitriding biomass advanced reburning denitration agent as recited in any one of claims 1 to 5, is characterized in that: the nitridized biomass advanced reburning denitration agent is applied to denitration of flue gas of a coal-fired boiler, and the specific application method comprises the following steps:
mixing the nitriding biomass reburning denitrifier particles with the recirculating flue gas, and spraying the mixture into a hearth from the upper part of a burnout zone in a flue zone with the temperature of 850-xReacting in the furnace outlet and flue to generate N2。
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