阅读说明：本技术 钙基颗粒同步脱硫脱硝剂的制备方法 (Preparation method of calcium-based particle synchronous desulfurization and denitrification agent ) 是由 梁磊 张卫东 钱星星 吴桂香 于 2021-09-13 设计创作，主要内容包括：本发明涉及固体废物处理资源化利用以及烟气脱硫脱硝技术领域,公开了钙基颗粒同步脱硫脱硝剂的制备方法,包括以下流程：S1:称取一定质量的Ca(OH)-(2)、生物质灰、KMnO-(4)、硅藻土、PEO(聚氧化乙烯)、铝溶胶、MgSO-(4)原料；S2:所述原料在捏合机中加水混合形成均匀分散的湿坯料,经挤出机挤出圆柱状或三叶草形湿坯体；S3:所述湿坯体在干燥器中干燥,再经冷却后得到钙基颗粒同步脱硫脱硝剂成品。本发明得到的钙基颗粒同步脱硫脱硝剂,使用原料成本低且来源很广泛,制备工序简单。钙基颗粒同步脱硫脱硝剂比表面积大,强度高,脱硫脱硝效率分别达到98％和80％以上,适用烟气温度范围宽,SO-(2)和NO-(x)满足超低排放。(The invention relates to the technical field of solid waste treatment resource utilization and flue gas desulfurization and denitration, and discloses a preparation method of a calcium-based particle synchronous desulfurization and denitration agent, which comprises the following steps: s1 weighing Ca (OH) with a certain mass 2 Biomass ash, KMnO 4 Diatomaceous earth, PEO (polyethylene oxide), alumina sol, MgSO 4 Raw materials; s2, adding water into the raw materials in a kneading machine, mixing to form uniformly dispersed wet blanks, and extruding cylindrical or clover-shaped wet blanks through an extruder; and S3, drying the wet blank in a dryer, and cooling to obtain the finished product of the calcium-based particle synchronous desulfurization and denitrification agent. The calcium-based particle synchronous desulfurization and denitrification agent obtained by the invention has the advantages of low cost of used raw materials, wide sources and simple preparation process. The calcium-based particle synchronous desulfurization and denitrification agent has large specific surface area, high strength, desulfurization and denitrification efficiency of more than 98 percent and 80 percent respectively, wide applicable flue gas temperature range and SO 2 And NO x Meet the requirement of ultra-low emission。)

1. The preparation method of the calcium-based particle synchronous desulfurization and denitrification agent is characterized by comprising the following steps:

s1, raw material weighing line: weighing a certain mass of Ca (OH)₂Biomass ash, KMnO₄Diatomaceous earth, PEO (polyethylene oxide), alumina sol, MgSO₄Raw materials;

s2, molding granulation line:

(1) mixing and kneading: adding water into the raw materials in a kneader and mixing to form uniformly dispersed wet blanks;

(2) and (3) molding and granulating: feeding the wet blank material into an extruder to obtain a cylindrical or clover-shaped wet blank body;

s3, dry control line: and conveying the wet blank body into a dryer through a belt conveyor for drying to obtain a dry blank body, and discharging after cooling to obtain a finished product.

2. The method for preparing a calcium-based particle desulfurization and denitrification agent in synchronization with the above claim 1, wherein the Ca (OH) concentration in S1 is set to be within the range of Ca (OH)₂Is in powder shape, the purity is about 90 percent, and the granularity is about 300 meshes.

3. The method for preparing the calcium-based particle synchronous desulfurization and denitrification agent as claimed in claim 1, wherein the biomass ash in S1 is ash produced by burning straw, trees and other lignocellulose in a biomass power plant, and is mainly a mixture of a plurality of metal oxides.

4. The method for preparing a calcium-based particle desulfurization and denitrification agent in synchronization with the above claim 1, wherein the Ca (OH) concentration in S1 is set to be within the range of Ca (OH)₂Biomass ash, KMnO₄Diatomaceous earth, PEO (polyethylene oxide), alumina sol, MgSO₄Raw materials in a mass ratio of 70: 20: (0-10): 10: 1: 1: 1.

5. the method for preparing calcium-based particle synchronous desulfurization and denitrification agent as claimed in claim 1, wherein the KMnO is increased by the method described in S1₄The denitration efficiency is improved or the dosage of the denitration agent is reduced.

6. The method for preparing a calcium-based particle synchronous desulfurization and denitrification agent as claimed in claim 1, wherein the desulfurization and denitrification agent particles in S2 are cylindrical or clover-shaped particles with a diameter of 4mm and a length of 6 mm.

7. The preparation method of the calcium-based particle synchronous desulfurization and denitrification agent as claimed in claim 1, wherein the bulk density of the finished desulfurization and denitrification agent particles in S3 is 600-700 kg/m³。

8. The method for preparing the calcium-based particle synchronous desulfurization and denitrification agent as claimed in claim 1, wherein the wet blank is dried in a drier at a temperature of about 100 ℃ for 3 hours in a continuous drying process in S3.

Technical Field

The invention relates to the technical field of solid waste treatment and resource utilization and flue gas desulfurization and denitration, and discloses a preparation method of a calcium-based particle synchronous desulfurization and denitration agent.

Background

28 th 4 month in 2019, the five committees of the state jointly issue the opinion about promoting the ultralow emission of the steel industry, and propose the flue gas SO₂、NO_XThe hourly mean value of the emission mass concentration of the particulate matters is respectively lower than 35mg/Nm³、50mg/Nm³、10mg/Nm³(standard, dry basis). At present, part of non-electric enterprises smoke NO_XThe Selective Catalytic Reduction (SCR) method is selected for the ultra-low emission treatment. Denitration reducing agent NH₃Can react with SO in the flue gas₂、SO₃A chemical reaction takes place to generate viscous NH₄HSO₄And powdered (NH)₄)₂SO₄And substances are easy to adhere and accumulate to block microporous channels and active sites of the catalyst, and in order to avoid the phenomenon, a process technical route of firstly desulfurizing and then denitrifying is generally selected in the industry. The flue gas desulfurization technology applied to the non-electric industry mainly comprises a wet method, a semi-dry method and a dry method, and the flue gas temperature after desulfurization is reduced to a great extent. In industrial practice and application, coke oven gas or blast furnace gas is used as fuel, and is combusted to generate high-temperature flue gas which is heated and desulfurized, so that temperature conditions are provided for rear-end SCR denitration. The denitration catalyst used for removing NOx from flue gas of the thermal power generating unit has higher denitration efficiency under the medium temperature condition of 320-400 ℃, and the engineering application is most mature and common. The flue gas exhaust in the non-electric industry is generally 90-200 ℃, the exhaust temperature is low, the denitration is carried out by heating to the medium-temperature denitration temperature of 320-400 ℃, the gas consumption is high, the investment and operation cost are high, and the technology cannot be directly transplanted.

The Chinese patent document application No. 201610375470.5 discloses a calcium-based desulfurizer for semi-dry desulfurization process and a preparation method thereof, which is characterized in that industrial wastes such as lime kiln dust removal powder and lime kiln screen blanking are used as main raw materials, and the particle size of the raw materials is graded, so that the problems of high cost of desulfurizer for semi-dry desulfurization process and waste recycling generated in lime kiln production can be effectively solved, but the adopted process is semi-dry desulfurization process, has no denitration function, has more temperature reduction after desulfurization, and still consumes a large amount of fuel (such as coal gas, natural gas and the like) when heated to the temperature required by denitration.

The Chinese patent document application No. 201310528591.5 discloses a modified calcium-based desulfurizer for dry desulfurization of sintering flue gas and a preparation method thereof, which is characterized in that limestone, municipal domestic sludge and anthracite powder are uniformly mixed according to a certain proportion, and the modified calcium-based desulfurizer for dry desulfurization of sintering flue gas is prepared by the working procedures of calcining, cooling, grinding and the like, but the preparation process is complex, the energy consumption is high, the desulfurizer particles are smaller, are easily carried by outlet flue gas, form secondary pollution and have no denitration function.

The Chinese patent document application No. 201810461190.5 discloses a carbide slag composite calcium-based desulfurizer based on biomass conditioning and a preparation method thereof, and the desulfurizer is characterized in that biomass is mixed with wet carbide slag to adjust moisture in the wet carbide slag, so that the problem of charging of the wet carbide slag is solved under the condition of no need of a heating and drying process, but the carbide slag composite calcium-based desulfurizer is mainly applied to the field of desulfurization in a circulating fluidized bed furnace, has low desulfurization efficiency and does not have a denitration function.

Disclosure of Invention

Aiming at overcoming the defects in the prior art, the invention aims to provide a preparation method of a calcium-based particle synchronous desulfurization and denitrification agent, which adopts Ca (OH)₂Biomass ash, KMnO₄Diatomaceous earth, PEO (polyethylene oxide), alumina sol, MgSO₄The raw materials are added with water and mixed in a kneading machine to form uniformly dispersed wet blanks, cylindrical or clover-shaped wet blanks are extruded by an extruder, the wet blanks are dried in a dryer and then cooled to obtain finished products of the calcium-based particle synchronous desulfurization and denitrification agent, and the desulfurization and denitrification efficiency is remarkably improved.

In order to achieve the purpose, the invention adopts the following technical scheme:

the preparation method of the calcium-based particle synchronous desulfurization and denitrification agent is characterized by comprising the following steps:

s1, raw material weighing line: weighing a certain mass of Ca (OH)₂Biomass ash, KMnO₄Diatomaceous earth, PEO (polyethylene oxide), alumina sol, MgSO₄Raw materials;

s2, molding granulation line:

(1) mixing and kneading: adding water into the raw materials in a kneader and mixing to form uniformly dispersed wet blanks;

(2) and (3) molding and granulating: feeding the wet blank material into an extruder to obtain a cylindrical or clover-shaped wet blank body;

s3, dry control line: conveying the wet blank body to a dryer through a belt conveyor for drying to obtain a dry blank body, and discharging after cooling to obtain a finished product;

preferably, the Ca (OH) in the step S1₂Is powdery, the purity is about 90 percent, and the granularity is about 300 meshes;

preferably, the biomass ash in step S1 is ash generated by burning lignocellulose such as straw and trees in a biomass power plant, and is mainly a mixture of a plurality of metal oxides;

preferably, the Ca (OH) in the step S1₂Biomass ash, KMnO₄Diatomaceous earth, PEO (polyethylene oxide), alumina sol, MgSO₄Raw materials in a mass ratio of 70: 20: (0-10): 10: 1: 1: 1;

preferably, in the step S1, the increase of KMnO₄The denitration efficiency is improved or the dosage of the denitration agent is reduced;

preferably, in the step S2, the desulfurization and denitrification agent particles are cylindrical or clover-leaf-shaped particles with the diameter of 4mm and the length of 6mm, and the bulk density is 600-700 kg/m³；

Preferably, the wet blank in the step S3 is dried in a dryer at a temperature of about 100 ℃ for 3 hours.

The calcium-based particle synchronous desulfurization and denitrification agent obtained by the preparation method of the calcium-based particle synchronous desulfurization and denitrification agent has desulfurization and denitrification efficiencies of over 98 percent and over 80 percent respectively, and SO₂And NO_xMeeting the requirement of ultra-low emission.

The invention has the beneficial effects that:

1. the invention relates to a preparation method of a calcium-based particle synchronous desulfurization and denitrification agent, which adopts Ca (OH)₂Biomass ash, KMnO₄Diatomaceous earth, PEO (polyethylene oxide), alumina sol, MgSO₄As raw material in biomassContains a large amount of soluble potassium, potassium to solid powder base Ca (OH)₂Surface migration greatly improves Ca (OH) in the desulfurization process₂In CaSO₄And CaSO₃Diffusion capability of the dense layer product.

2. The invention relates to a preparation method of a calcium-based particle synchronous desulfurization and denitrification agent, which adopts Ca (OH)₂Biomass ash, KMnO₄Diatomaceous earth, PEO (polyethylene oxide), alumina sol, MgSO₄As raw material, KMnO₄Oxidizing NO in the flue gas to NO₂、NO₃、N₂O₅Equal valence state NO_xSO in flue gas₂And NO₂With Ca (OH) in the desulfurization and denitrification agent₂And the alkaline substances are subjected to chemical reaction, so that the aim of synchronous desulfurization and denitrification is fulfilled.

3. The invention relates to a preparation method of a calcium-based particle synchronous desulfurization and denitrification agent, which adopts Ca (OH)₂Biomass ash, KMnO₄Diatomaceous earth, PEO (polyethylene oxide), alumina sol, MgSO₄The raw materials are PEO and alumina sol as forming aids, so that the binding power and the mechanical strength of the calcium-based particle synchronous desulfurization and denitrification agent are improved.

4. According to the preparation method of the calcium-based particle synchronous desulfurization and denitrification agent, the cylindrical or clover-shaped wet blank body is extruded by the extruder, the wet blank body is dried in the dryer, and then the finished product of the calcium-based particle synchronous desulfurization and denitrification agent is obtained after cooling, so that the specific surface area is greatly increased, and the desulfurization and denitrification efficiency is remarkably improved.

Drawings

The technical solutions in the embodiments of the present invention will be described in detail by reading with reference to the following drawings, so as to be understood and read by those skilled in the art, but this is only a part of the better embodiments, and the scope of the present invention is not limited thereto:

FIG. 1 is a process flow chart of a preparation method of the calcium-based particle synchronous desulfurization and denitrification agent of the invention; FIG. 2 is a sectional view of the clover-shaped calcium-based particle synchronous desulfurization and denitrification agent of the invention.

Detailed Description

As shown in fig. 1, the preparation method of the calcium-based particle synchronous desulfurization and denitrification agent provided by the invention is characterized by comprising the following steps:

the preparation method of the calcium-based particle synchronous desulfurization and denitrification agent is characterized by comprising the following steps:

s1, raw material weighing line: weighing a certain mass of Ca (OH)₂Biomass ash, KMnO₄Diatomaceous earth, PEO (polyethylene oxide), alumina sol, MgSO₄Raw materials;

Ca(OH)₂is powdery, the purity is about 90 percent, and the granularity is about 300 meshes; the biomass ash is ash produced by burning lignocellulose such as straws and trees in a biomass power plant and is mainly a mixture of various metal oxides;

s2, molding granulation line:

(1) mixing and kneading: adding water into the raw materials in a kneader and mixing to form uniformly dispersed wet blanks;

(2) and (3) molding and granulating: feeding the wet blank material into an extruder to obtain a cylindrical or clover-shaped wet blank body;

the calcium-based particle synchronous desulfurization and denitrification agent wet blank body is cylindrical or clover-shaped with the diameter of 4mm and the length of 6 mm;

s3, dry control line: conveying the wet blank body to a dryer through a belt conveyor for drying to obtain a dry blank body, and discharging after cooling to obtain a finished product;

continuously drying the wet blank in a dryer at the temperature of about 100 ℃ for 3 hours to obtain the finished product of the calcium-based particle synchronous desulfurization and denitrification agent with the bulk density of 600-700 kg/m³；

The prepared calcium-based particle synchronous desulfurization and denitrification agent has good performance, the desulfurization and denitrification efficiency reaches more than 98% and 80% respectively, the applicable flue gas temperature range is wide, and SO is₂And NO_xMeeting the requirement of ultra-low emission.

The preparation method of the calcium-based particle synchronous desulfurization and denitrification agent of the invention is further described below by combining specific examples.

Example 1

The preparation method of the calcium-based particle synchronous desulfurization and denitrification agent is characterized by comprising the following steps:

S1and raw material weighing line: weighing a certain mass of Ca (OH)₂Biomass ash, KMnO₄Diatomaceous earth, PEO (polyethylene oxide), alumina sol, MgSO₄Raw materials in a mass ratio of 70: 20: 5: 10: 1: 1: 1;

s2, molding granulation line:

(1) mixing and kneading: adding water into the raw materials in a kneader and mixing to form uniformly dispersed wet blanks;

(2) and (3) molding and granulating: feeding the wet blank material into an extruder to obtain a cylindrical wet blank body, wherein the diameter of the wet blank body is 4mm, and the length of the wet blank body is 6 mm;

s3, dry control line: conveying the wet blank body into a dryer by a belt conveyor, continuously drying for 3h at the temperature of 100 ℃ to obtain a dry blank body, cooling, and discharging to obtain a finished product with the bulk density of 650kg/m³。

Example 2

The preparation method of the calcium-based particle synchronous desulfurization and denitrification agent is characterized by comprising the following steps:

s1, raw material weighing line: weighing a certain mass of Ca (OH)₂Biomass ash, KMnO₄Diatomaceous earth, PEO (polyethylene oxide), alumina sol, MgSO₄Raw materials in a mass ratio of 70: 20: 7: 10: 1: 1: 1;

s2, molding granulation line:

(1) mixing and kneading: adding water into the raw materials in a kneader and mixing to form uniformly dispersed wet blanks;

(2) and (3) molding and granulating: feeding the wet blank material into an extruder to obtain a clover-shaped wet blank body, wherein the diameter of the wet blank body is 4mm, and the length of the wet blank body is 6 mm;

s3, dry control line: conveying the wet blank body into a dryer through a belt conveyor, continuously drying for 3 hours at the temperature of 120 ℃ to obtain a dry blank body, cooling and discharging to obtain a finished product with the bulk density of 680kg/m³。

Example 3

The preparation method of the calcium-based particle synchronous desulfurization and denitrification agent is characterized by comprising the following steps:

s1, raw material weighing line: balanceTaking a certain mass of Ca (OH)₂Biomass ash, KMnO₄Diatomaceous earth, PEO (polyethylene oxide), alumina sol, MgSO₄Raw materials in a mass ratio of 70: 20: 10: 10: 1: 1: 1;

s2, molding granulation line:

(1) mixing and kneading: adding water into the raw materials in a kneader and mixing to form uniformly dispersed wet blanks;

(2) and (3) molding and granulating: feeding the wet blank material into an extruder to obtain a cylindrical wet blank body, wherein the diameter of the wet blank body is 4mm, and the length of the wet blank body is 6 mm;

s3, dry control line: conveying the wet blank body into a dryer through a belt conveyor, continuously drying for 3 hours at the temperature of 130 ℃ to obtain a dry blank body, cooling and discharging to obtain a finished product with the bulk density of 660kg/m³。