CN114790406B - Fuel additive for inhibiting generation of nitrogenous pollutants in biomass fuel combustion - Google Patents
Fuel additive for inhibiting generation of nitrogenous pollutants in biomass fuel combustion Download PDFInfo
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- 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
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- 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
- C10L10/00—Use of additives to fuels or fires for particular purposes
- C10L10/02—Use of additives to fuels or fires for particular purposes for reducing smoke development
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- 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
- C10L9/12—Oxidation means, e.g. oxygen-generating compounds
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- 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
- C10L2200/00—Components of fuel compositions
- C10L2200/02—Inorganic or organic compounds containing atoms other than C, H or O, e.g. organic compounds containing heteroatoms or metal organic complexes
- C10L2200/0272—Silicon containing compounds
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- 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
- C10L2200/00—Components of fuel compositions
- C10L2200/02—Inorganic or organic compounds containing atoms other than C, H or O, e.g. organic compounds containing heteroatoms or metal organic complexes
- C10L2200/029—Salts, such as carbonates, oxides, hydroxides, percompounds, e.g. peroxides, perborates, nitrates, nitrites, sulfates, and silicates
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/10—Biofuels, e.g. bio-diesel
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
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- Engineering & Computer Science (AREA)
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- Solid Fuels And Fuel-Associated Substances (AREA)
Abstract
The invention discloses a fuel additive for inhibiting the generation of nitrogen-containing pollutants in the combustion of biomass fuel. The fuel additive is obtained by ultrasonic impregnation of a hydrothermal reaction product of a diatomite, potassium permanganate and manganese nitrate mixed system in a KOH solution and calcination. The fuel additive provided by the invention can adsorb NH generated in the combustion process of biomass fuel 3 And convert it into nitrogen and water, thereby inhibiting the pollutant NO in the combustion process of biomass fuel x Is generated. Specifically, the transition metal amorphous manganese oxide is prepared in a potassium permanganate and manganese nitrate mixed system by a hydrothermal method, and has a tunnel structure, so that the NH in a low-temperature region of 80-150 ℃ can be improved 3 The catalytic activity of the catalyst is converted into nitrogen and water, and K can be stabilized + And basic cations to further enhance the fuel additive to contaminant NO x Inhibition of the production.
Description
Technical Field
The invention relates to the technical field of environmental protection and renewable energy sources, in particular to a fuel additive for inhibiting the generation of nitrogenous pollutants in biomass fuel combustion
Background
Energy is an important factor for human survival, civilization development and social progress. Since the industrial revolution, the science and technology have rapidly developed, the socioeconomic has changed over the sky, and the consumption of natural energy by humans has been continuously increasing, and it is estimated that the world energy consumption in 2050 will be twice as much as the energy consumption in the early 21 st century or more. Currently, the energy used by humans is mainly dependent on three fossil fuels; coal, oil and natural gas, while fossil fuels are non-renewable resources and have limited reserves, long-term exploitation and utilization have led to the exhaustion of fossil energy, and humans face serious energy crisis. Meanwhile, the use of fossil energy generates a large amount of greenhouse gases, which causes serious environmental problems such as air pollution, greenhouse effect, ozone layer damage and the like, and brings serious threat to human survival. Therefore, finding clean and sustainable alternative energy sources is an urgent issue in the field of energy applications today.
Currently, renewable energy is the only hope for producing clean and sustainable energy, and new energy is receiving increasing attention by virtue of renewable and environmental advantages. In addition to the already industrialized solar and wind energy conversion technologies, the energy available to humans also includes biomass energy. Biomass energy emits less harmful gases during conversion than fossil energy. The biomass energy source is rich, the cost is low, and the biomass energy source is the only renewable energy source which can be converted into fuel and is also the only renewable carbon source. Biomass is a clean renewable energy source, which is energy obtained by converting solar energy obtained by biology into chemical energy through photosynthesis and stored in biomass, and includes not only various plants, crops and aquatic resources directly grown through photosynthesis, but also organic wastes produced by human beings or animals through consumption of various animals and plants and production activities. From the viewpoint of energy, it can be mainly classified into biomass of production resource type and biomass of organic waste type.
Biomass energy is an important new energy source and is an important energy source transformation force. The biomass energy utilization potential of China is large, and the biomass resources which can be used as energy resources are about 4.6 hundred million annually. At present, biomass energy resources in China mainly comprise straw, wood residues, livestock manure, energy crops and the like, and the biomass energy resources have the advantages of being rich in source, low in price, capable of achieving both productivity and economic performance and the like. The carbon dioxide released by the biomass fuel in the conversion process of combustion or other technologies is basically equal to the absorbed carbon dioxide, so that the zero emission of carbon is realized. However, the biomass is the same as the traditional fossil fuels such as coal, petroleum, natural gas and the like, the content of nitrogen oxides in pollutants in the combustion exhaust gas is high, and more than about 80 percent of nitrogen can be converted into NO in the combustion process x Serious environmental pollution problems such as haze, acid rain and the like are caused, so that the pollution problem of emission is concerned while the biomass briquette fuel is efficiently utilized.
Disclosure of Invention
Based on the problems of the prior art, the present invention aims to provide a fuel additive for inhibiting the generation of nitrogen-containing pollutants in the combustion of biomass fuels, which can be prepared by adsorbing NH 3 And promote NH 3 React with nitrogen oxides to generate N 2 、H 2 O; thereby reducing NO in the tail gas of biomass fuel combustion x The content effect, thereby reducing the subsequent treatment cost of the biomass fuel smoke and relieving the current situation of atmospheric pollution.
In a first aspect, the invention provides a fuel additive for inhibiting the generation of nitrogen-containing pollutants in biomass fuel combustion, which is obtained by ultrasonically soaking a hydrothermal reaction product of a diatomite, potassium permanganate and manganese nitrate mixed system in a KOH solution and then calcining.
Preferably, the mass ratio of diatomite, potassium permanganate, manganese nitrate solution, KOH solution and deionized water used in the process of obtaining the fuel additive is 5 (2-3): 5-7): 10 (75-85).
Preferably, the molar ratio of KOH to deionized water in the KOH solution is (0.05-0.5): 1.
The preparation method of the fuel additive for inhibiting the generation of nitrogen-containing pollutants in the combustion of biomass fuel comprises the following steps:
adding diatomite and potassium permanganate into deionized water and uniformly dispersing to obtain a mixed suspension.
And step two, dropwise adding a manganese nitrate solution into the mixed suspension obtained in the step one, performing hydrothermal reaction at 160-170 ℃, and performing solid-liquid separation on the obtained product.
Step three, immersing the solid-phase product obtained by the solid-liquid separation in KOH solution, and carrying out ultrasonic stirring for a preset period of time; and drying and calcining the obtained solid phase product to obtain the fuel additive.
Preferably, in the first step, the diatomite and the potassium permanganate are dispersed in the deionized water by a magnetic stirring mode.
Preferably, the mass fraction of the manganese nitrate solution in the second step is 12-16%.
Preferably, in the third step, the preset time period of ultrasonic stirring is 20min;
preferably, the solid phase product after impregnation in KOH solution is dried in an oven for two hours after drying for 20 hours at vacuum and normal temperature.
Preferably, in the third step, the calcination temperature is 300-400 ℃, the calcination time is 3 hours, and the heating rate is 12.5 ℃/min.
Preferably, the fuel additive obtained in step three is ground and sieved through a 40-60 mesh sieve.
In a second aspect, the invention provides a clean-tailed biomass briquette fuel comprising a main fuel and the fuel additive. The fuel additive is mixed in the main fuel. The mass fraction of the fuel additive in the biomass briquette fuel is 0.9-1.6%. The main fuel is biomass molding fuel.
The beneficial effects of the invention are as follows:
1. the fuel additive provided by the invention can adsorb NH generated in the combustion process of biomass fuel 3 And convert it into nitrogen and water, thereby inhibiting the pollutant NO in the combustion process of biomass fuel x Is generated. Specifically, the transition metal amorphous manganese oxide is prepared in a potassium permanganate and manganese nitrate mixed system by a hydrothermal method, and has a tunnel structure, so that the NH in a low-temperature region of 80-150 ℃ can be improved 3 The catalytic activity of the catalyst is converted into nitrogen and water, and K can be stabilized + And basic cations to further enhance the fuel additive to contaminant NO x Inhibition of the production.
2. The invention adopts KOH solution to carry out K on fuel additive + Part of K + Supported on the surface of the fuel additive, enhancing the affinity of the fuel additive for ammonia, another part K + Enters the interior of the crystal lattice of the fuel additive, causes the distortion of the crystal lattice to release manganese ions with high activity, thereby promoting NH in the biomass combustion exhaust gas 3 The adsorption and conversion efficiency of the fuel into nitrogen and water are further improved, and the NO in the biomass fuel combustion process is inhibited x The effect is produced.
3. According to the invention, diatomite is added into a potassium permanganate and manganese nitrate mixed system to perform hydrothermal reaction together, and SiO in the diatomite 2 Under the actions of hydrothermal, KOH dipping and high-temperature calcination, the catalyst is mixed with Al 2 O 3 、Fe 2 O 3 、CaO、MgO、K 2 The alkaline earth metals such as O and the like form eutectic phases, the contact mode of the fuel additive and soot is improved, active oxygen such as peroxy or superoxide and the like is formed on the surface of alkali metal by promoting oxygen molecules, and high-activity oxygen species can react with biomass soot in an overflow mode, so that the catalytic oxidation of the soot is effectively promoted, and NO is reduced x Is generated.
Detailed Description
The present invention is further described below.
The preparation method of the environment-friendly sludge solidified fuel comprises the following steps:
firstly, weighing a certain amount of diatomite and potassium permanganate, dissolving in deionized water, magnetically stirring for 30min, and obtaining a mixed suspension after the diatomite and the potassium permanganate are uniformly dispersed.
Secondly, slowly dripping a manganese nitrate solution into the mixed suspension, transferring the mixed suspension into a reaction kettle, and performing hydrothermal reaction at 160 ℃ for 60min to obtain a black suspension; then, after the reaction kettle is naturally cooled to room temperature, filtering the black suspension; the solid phase obtained was washed several times to obtain a black solid.
Soaking the black solid in KOH solution, stirring for 20min by ultrasonic waves, taking out, drying for 20h at normal temperature under vacuum, drying for two hours in an oven, calcining for 3h in a muffle furnace at 300-400 ℃, cooling to room temperature, taking out the black solid, grinding, sieving with a 40-60-mesh sieve, and taking out and storing under the sieve.
The relative weight parts of the components in the steps are as follows: 5 parts of diatomite, 2-3 parts of potassium permanganate, 5-7 parts of manganese nitrate solution, 10 parts of KOH solution and 75-85 parts of deionized water; the mol ratio of KOH in KOH solution to deionized water is (0.05-0.5): 1.
Specific examples are provided below for the above preparation methods:
example 1
A fuel additive for inhibiting the formation of nitrogen-containing pollutants in the combustion of biomass fuel, comprising the following components in parts by weight: 5 parts of diatomite, 3 parts of potassium permanganate, 7 parts of manganese nitrate solution, 10 parts of KOH solution and 75 parts of deionized water. The molar ratio of KOH to deionized water in the KOH solution was 0.05:1.
In the third step, the temperature rising rate of the muffle furnace is 12.5 ℃/min, and the temperature rising interval is between the initial temperature and 350 ℃. In this example, the initial temperature was 20℃at room temperature.
The preparation of the fuel additive is carried out according to the sequence of the first step, the second step and the third step, the prepared additive is added into biomass briquette fuel prepared by biomass materials such as straw, wood dust, chaff and the like, the prepared biomass briquette fuel containing the additive (the mass fraction of the additive in the fuel is 1.4%) is burnt at 700 ℃, the flue gas in the burning process is collected, and the component analysis is carried out by adopting an infrared gas analyzer, and is shown in the table 1 in detail.
Example 2
A fuel additive for inhibiting the formation of nitrogen-containing pollutants in the combustion of biomass fuel, comprising the following components in parts by weight: 5 parts of diatomite, 3 parts of potassium permanganate, 7 parts of manganese nitrate solution, 10 parts of KOH solution and 75 parts of deionized water. The molar ratio of KOH to deionized water in the KOH solution was 0.2:1.
In the third step, the temperature rising rate of the muffle furnace is 12.5 ℃/min, and the temperature rising interval is between the initial temperature and 350 ℃.
The preparation of the fuel additive is carried out according to the sequence of the first step, the second step and the third step, the prepared additive is added into biomass briquette fuel prepared by adopting biomass materials such as straw, wood dust, chaff and the like, the prepared biomass briquette fuel containing the additive (the mass fraction of the additive in the fuel is 1.4 percent) is burnt at 700 ℃, the flue gas in the burning process is collected, and the component analysis is carried out by adopting an infrared gas analyzer, and is shown in the table 1 in detail.
Example 3
A fuel additive for inhibiting the formation of nitrogen-containing pollutants in the combustion of biomass fuel, comprising the following components in parts by weight: 5 parts of diatomite, 3 parts of potassium permanganate, 7 parts of manganese nitrate solution, 10 parts of KOH solution and 75 parts of deionized water. The molar ratio of KOH to deionized water in the KOH solution was 0.5:1.
In the third step, the temperature rising rate of the muffle furnace is 12.5 ℃/min, and the temperature rising interval is between the initial temperature and 350 ℃.
The preparation of the fuel additive is carried out according to the sequence of the first step, the second step and the third step, the prepared additive is added into biomass briquette fuel prepared by adopting biomass materials such as straw, wood dust, chaff and the like, the prepared biomass briquette fuel containing the additive (the mass fraction of the additive in the fuel is 1.4 percent) is burnt at 700 ℃, the flue gas in the burning process is collected, and the component analysis is carried out by adopting an infrared gas analyzer, and is shown in the table 1 in detail.
Example 4
A fuel additive for inhibiting the formation of nitrogen-containing pollutants in the combustion of biomass fuel, comprising the following components in parts by weight: 5 parts of diatomite, 3 parts of potassium permanganate, 7 parts of manganese nitrate solution, 10 parts of KOH solution and 75 parts of deionized water. The molar ratio of KOH to deionized water in the KOH solution was 0.2:1.
In the third step, the temperature rising rate of the muffle furnace is 12.5 ℃/min, and the temperature rising interval is between the initial temperature and 350 ℃.
The preparation of the fuel additive is carried out according to the sequence of the first step, the second step and the third step, the prepared additive is added into biomass briquette fuel prepared by adopting biomass materials such as straw, wood dust, chaff and the like, the prepared biomass briquette fuel containing the additive (the mass fraction of the additive in the fuel is 1.4 percent) is burnt at 700 ℃, the flue gas in the burning process is collected, and the component analysis is carried out by adopting an infrared gas analyzer, and is shown in the table 1 in detail.
Example 5
A fuel additive for inhibiting the formation of nitrogen-containing pollutants in the combustion of biomass fuel, comprising the following components in parts by weight: 5 parts of diatomite, 3 parts of potassium permanganate, 7 parts of manganese nitrate solution, 10 parts of KOH solution and 75 parts of deionized water. The molar ratio of KOH to deionized water in the KOH solution was 0.2:1.
In the third step, the temperature rising rate of the muffle furnace is 12.5 ℃/min, and the temperature rising interval is between the initial temperature and 350 ℃.
The preparation of the fuel additive is carried out according to the sequence of the first step, the second step and the third step, the prepared additive is added into biomass briquette fuel prepared by adopting biomass materials such as straw, wood dust, chaff and the like, the prepared biomass briquette fuel containing the additive (the mass fraction of the additive in the fuel is 1.4 percent) is burnt at 700 ℃, the flue gas in the burning process is collected, and the component analysis is carried out by adopting an infrared gas analyzer, and is shown in the table 1 in detail.
Comparative example 1
The biomass briquette fuel prepared by adopting biomass materials such as straw, wood dust and chaff is free from adding additives, the prepared biomass briquette fuel is combusted at 700 ℃, the smoke in the combustion process is collected, and the smoke components are analyzed by adopting an infrared gas analyzer, and the details are shown in table 1.
Comparative example 2
The preparation of the fuel additive is carried out in the order of steps one, two and three, with the difference that: in the second step, the hydrothermal reaction at 160 ℃ in the reaction kettle is replaced by water bath at 90 ℃ in a beaker for 120min.
In the third step, the temperature rising rate of the muffle furnace is 12.5 ℃/min, and the temperature rising interval is between the initial temperature and 350 ℃.
The relative weight parts of the components in each step are as follows: 5 parts of diatomite, 3 parts of potassium permanganate, 7 parts of manganese nitrate solution, 10 parts of KOH solution and 75 parts of deionized water. The molar ratio of KOH to deionized water in the KOH solution was 0.2:1.
The prepared additive is added into biomass briquette fuel prepared from biomass materials such as straw, wood dust and chaff, the prepared biomass briquette fuel containing the additive (the mass fraction of the additive in the fuel is 1.4%) is placed at 700 ℃ for combustion, the smoke in the combustion process is collected, and the component analysis is carried out by adopting an infrared gas analyzer, and is shown in Table 1 in detail.
Comparative example 3
The preparation of the fuel additive is carried out in the order of steps one, two and three, with the difference that: and step three, deionized water is used for replacing KOH solution.
In the third step, the temperature rising rate of the muffle furnace is 12.5 ℃/min, and the temperature rising interval is between the initial temperature and 350 ℃.
The relative weight parts of the components in each step are as follows: 5 parts of diatomite, 3 parts of potassium permanganate, 7 parts of manganese nitrate solution and 75 parts of deionized water.
The prepared additive is added into biomass briquette fuel prepared from biomass materials such as straw, wood dust and chaff, the prepared biomass briquette fuel containing the additive (the mass fraction of the additive in the fuel is 1.4%) is placed at 700 ℃ for combustion, the smoke in the combustion process is collected, and the component analysis is carried out by adopting an infrared gas analyzer, and is shown in Table 1 in detail.
Table 1 analysis of the composition of biomass fuel combustion flue gas
| Project name | Mass fraction of NO | NH 3 Mass fraction | Mass fraction of HCN |
| Example 1 | 0.14％ | 0.19％ | 0.17％ |
| Example 2 | 0.11％ | 0.13％ | 0.13％ |
| Example 3 | 0.12％ | 0.14％ | 0.15 |
| Example 4 | 0.14％ | 0.16％ | 0.14 |
| Example 5 | 0.15％ | 0.16％ | 0.14 |
| Comparative example 1 | 0.24％ | 0.37％ | 0.48％ |
| Comparative example 2 | 0.20％ | 0.28％ | 0.35％ |
| Comparative example 3 | 0.22％ | 0.33％ | 0.34％ |
As can be seen from comparative examples 1 to 5 and comparative example 1, after the addition of the additive, the biomass briquette fuel was burnedRaw nitrogen-containing contaminants (NO, NH) 3 HCN) is significantly reduced, indicating that the additives provided herein are capable of significantly reducing NO during combustion of a biofuel x The generation of the smoke gas can reduce the subsequent smoke gas treatment cost and relieve the current situation of atmospheric pollution.
As can be seen from comparative examples 1 to 5 and comparative example 2, the hydrothermal reaction in the second step can significantly improve the effect of the additive in suppressing the generation of nitrogen-containing pollutants in the combustion of fuel.
As can be seen from comparative examples 1 to 5 and comparative example 3, the fuel additive was subjected to ultrasonic impregnation with KOH solution, and nitrogen-containing pollutants (NO, NH) in the combustion exhaust gas after ultrasonic impregnation with KOH solution 3 HCN) content is significantly reduced; description of the ultrasonic impregnation with KOH solution promotes NH in biomass combustion flue gas 3 The adsorption and conversion of the additive can obviously improve the effect of the additive on inhibiting the generation of nitrogen-containing pollutants in fuel combustion.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above examples, and all technical solutions belonging to the concept of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to the invention without departing from the principles thereof are intended to be within the scope of the invention as set forth in the following claims.
Claims (8)
1. The fuel additive for inhibiting the generation of nitrogenous pollutants in the combustion of biomass fuel is characterized in that: the preparation method comprises the steps of ultrasonically soaking a hydrothermal reaction product of a diatomite, potassium permanganate and manganese nitrate mixed system in a KOH solution, and calcining to obtain the product; the mass ratio of diatomite, potassium permanganate, manganese nitrate solution, KOH solution and deionized water used in the process of obtaining the fuel additive is 5 (2-3): 5-7): 10 (75-85); in the KOH solution, the mol ratio of KOH to deionized water is (0.05-0.5): 1.
2. The method for preparing a fuel additive for inhibiting the formation of nitrogen-containing contaminants in the combustion of biomass fuel according to claim 1, characterized by: the method comprises the following steps:
adding diatomite and potassium permanganate into deionized water and uniformly dispersing to obtain a mixed suspension;
step two, after the manganese nitrate solution is dripped into the mixed suspension obtained in the step one, carrying out hydrothermal reaction at 160-170 ℃ and carrying out solid-liquid separation on the obtained product;
step three, immersing the solid-phase product obtained by the solid-liquid separation in KOH solution, and carrying out ultrasonic stirring for a preset period of time; and drying and calcining the obtained solid phase product to obtain the fuel additive.
3. The preparation method according to claim 2, characterized in that: in the first step, the diatomite and the potassium permanganate are dispersed in deionized water in a magnetic stirring mode.
4. The preparation method according to claim 2, characterized in that: and step two, the mass fraction of the manganese nitrate solution is 12-16%.
5. The preparation method according to claim 2, characterized in that: the solid phase product immersed in the KOH solution was dried for 20 hours at a vacuum normal temperature, and then dried in an oven for two hours.
6. The preparation method according to claim 2, characterized in that: in the third step, the calcination temperature is 300-400 ℃, the calcination time is 3 hours, and the heating rate is 12.5 ℃/min.
7. The preparation method according to claim 2, characterized in that: grinding the fuel additive obtained in the step three and sieving the ground fuel additive through a 40-60-mesh sieve.
8. The utility model provides a clean living beings fuel of tail gas which characterized in that: comprising a main fuel and the fuel additive of claim 1; the fuel additive is mixed in the main fuel; the mass fraction of the fuel additive in the biomass briquette fuel is 0.9% -1.6%; the main fuel is biomass molding fuel.
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| CN112547117A (en) * | 2019-09-25 | 2021-03-26 | 北京化工大学 | Normal-temperature NH used under plasma driving condition3Catalyst for selective catalytic reduction of NO and preparation method thereof |
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