阅读说明：本技术 钙基同步脱硫脱硝剂的制作方法 (Preparation method of calcium-based 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,公开了钙基同步脱硫脱硝剂的制作方法,包括以下流程：S1:称取一定质量的Ca(OH)-(2)、SDS脱硫废渣、KMnO-(4)、硅藻土、PEO(聚氧化乙烯)、CaCl-(2)、铝溶胶原料；S2:所述原料在捏合机中加水混合形成均匀分散的湿坯料；S3:所述湿坯料在干燥器中干燥,冷却后再经破碎、筛分、研磨成钙基同步脱硫脱硝剂超细粉末。本发明得到的钙基同步脱硫脱硝剂,有效利用固体废弃物,所用原料成本低且来源很广泛,制备方法简单。本发明得到的钙基同步脱硫脱硝剂可用于半干法脱硫或干法脱硫,脱硫脱硝效率分别高达98％和80％以上,适用烟气宽温度窗口,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 method for preparing a calcium-based synchronous desulfurization and denitration agent, which comprises the following steps: s1 weighing Ca (OH) with a certain mass 2 SDS desulfurized waste residue, KMnO 4 Diatomaceous earth, PEO (polyethylene oxide), CaCl 2 Aluminum sol raw material; s2, adding water into the raw materials in a kneader and mixing to form uniformly dispersed wet blanks; and S3, drying the wet blank in a dryer, cooling, crushing, screening and grinding into calcium-based synchronous desulfurization and denitrification agent ultrafine powder. The calcium-based synchronous desulfurization and denitrification agent provided by the invention effectively utilizes solid wastes, and has the advantages of low cost and wide source of raw materials and simple preparation method. The calcium-based synchronous desulfurization and denitrification agent obtained by the invention can be used for semi-dry desulfurization or dry desulfurization, the desulfurization and denitrification efficiency is respectively up to more than 98% and 80%, and the calcium-based synchronous desulfurization and denitrification agent is suitable for wide temperature window of flue gas and SO 2 And NO x Meet the requirement of ultra-lowAnd (5) discharging.)

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

s1, raw material weighing line: weighing a certain mass of Ca (OH)₂SDS desulfurized waste residue, KMnO₄Diatomaceous earth, PEO (polyethylene oxide), CaCl₂Aluminum sol raw material;

s2, kneading line: mixing and kneading: adding water into the raw materials in a kneader and mixing to form uniformly dispersed wet blanks;

s3, drying, crushing, screening and grinding control line: and conveying the wet blank body into a dryer through a belt conveyor for drying to obtain a dry blank body, cooling, crushing, screening and grinding into calcium-based synchronous desulfurization and denitrification agent ultrafine powder.

2. The method for producing a calcium-based synchronous desulfurization and denitrification agent according to claim 1, wherein the Ca (OH) in S1₂Is powder with the granularity of about 300 meshes and the purity of about 90 percent.

3. The method for preparing the calcium-based synchronous desulfurization and denitrification agent according to claim 1, wherein the SDS desulfurization waste residue in S1 mainly comprises NaHCO₃、Na₂CO₃、Na₂SO₄、Na₂SO₃Is industrial solid waste.

4. The method for preparing a calcium-based synchronous desulfurization and denitrification agent according to claim 1, wherein the Ca (OH) content in S1₂SDS desulfurized waste residue, KMnO₄Diatomaceous earth, PEO (polyethylene oxide), CaCl₂And the mass ratio of the aluminum sol to the aluminum sol is 40: 30: (0-15): 10: 5: 4: 1.

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

6. The method for preparing a calcium-based synchronous desulfurization and denitrification agent as claimed in claim 1, wherein the wet billet is continuously dried in a drier at a temperature of about 100 ℃ for 3 hours in S3.

7. The method for preparing a calcium-based synchronous desulfurization and denitrification agent as claimed in claim 1, wherein the dried blank in S3 is crushed by a crusher, sieved, and the particulate material with a particle size below 2mm is ground by a grinder to obtain ultrafine calcium-based synchronous desulfurization and denitrification agent powder with a particle size of about 25 μm, and the large particulate material on the sieve is returned to the crusher for continuous crushing.

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 synchronous desulfurization and denitration agent.

Background

28 th 4 th month in 2019, the five committees of the state jointly issue the opinion on promoting the ultralow emission of the steel industry, and require the flue gas SO₂、NO_XThe hourly mean value of the emission mass concentration of the particulate matters respectively reaches 35mg/Nm³、50mg/Nm³、10mg/Nm³The following.

At present, the flue gas desulfurization and denitration of the coal-fired boiler of the power plant generally adopts an SCR and wet desulfurization integrated process technology. However, the property of the flue gas discharged by non-electric industries such as metallurgy, steel, coking, sintering, chemical industry and the like is greatly different from the property of the flue gas discharged by power plants, the SCR + wet desulphurization process is not suitable for the flue gas treatment of the non-electric industries, and the process has some defects. The defects of wet desulphurization are as follows: a) the power consumption of equipment such as a circulating pump, an oxidation fan and the like is high; b) the desulfurized flue gas carries more water to form white smoke, and the system water supplement amount and the wastewater discharge amount are large; c) the process flow is complex, and the operation requirement on operators is high; the SCR denitration has the defects that: a) the SCR denitration reactor is arranged behind the economizer, the catalyst adopts a medium-temperature denitration catalyst at 300-400 ℃, and dust and SO in flue gas₂High mass concentration, severe erosion and abrasion of catalyst by dust, SO₂Can be converted into SO under the action of catalyst₃，SO₃Easy to react with denitration reducing agent NH₃Reaction to form NH₄HSO₄，NH₄HSO₄The smoke-free flame-retardant rubber is liquid at 150-230 ℃, is dispersed in smoke, has viscosity, and is easy to block and corrode equipment such as a rear-end air preheater; b) if the SCR denitration reactor is arranged after wet desulphurization, dust and SO₂The mass concentration is low, but the flue gas temperature after desulfurization is low and is only 50-55 ℃, and the flue gas temperature after desulfurization needs to be raised to 300-400 ℃ by a matched hot blast stove, so that the requirement of medium-temperature SCR denitration on temperature can be met, and the energy consumption of the system is very high.

Chinese patent document No. 201310055375.3 discloses a semisteel desulfurizing agent and a desulfurization method using the same, which is characterized by using CaF₂Mg and CaO are used as raw materials, a KR method is adopted for desulfurization, but the utilization rate of a desulfurizer is low, the desulfurization efficiency is low, and the denitration function is not realized.

Chinese patent document No. 201510561950.6 discloses a denitration agent for denitration from flue gas, and a preparation method and application thereof, which is characterized in that titanium dioxide, attapulgite clay or montmorillonite particles are used as inert carriers, calcium hydroxide and yttrium hydroxide react with a sulfur source to generate denitration agent particles, but the denitration agent particles have the disadvantages of high raw material cost, complex manufacturing process, low denitration efficiency and no desulfurization function.

The Chinese patent document No. 201910187392.X discloses a selective denitration agent and a denitration treatment process and system thereof, and the selective denitration agent is characterized in that an amido denitration active component, peroxide and an auxiliary agent are prepared into solution or powder, the solution or powder is conveyed to a high-temperature area of a boiler and dispersed into flue gas of the boiler to react with nitric oxide in the flue gas to realize denitration, but the denitration efficiency is greatly influenced by temperature, the processing raw material cost of the denitration agent is high, the denitration efficiency is low, and the denitration agent does not have a desulfurization function.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a method for preparing a calcium-based synchronous desulfurization and denitrification agent, which adopts Ca (OH)₂SDS desulfurized waste residue, KMnO₄Diatomaceous earth, PEO (polyethylene oxide), CaCl₂The aluminum sol is used as a raw material, water is added into a kneading machine to be mixed to form uniformly dispersed wet blanks, the wet blanks are dried in a dryer, and the wet blanks are crushed, screened and ground into calcium-based synchronous desulfurization and denitrification agent ultrafine powder after being cooled, so that the desulfurization and denitrification efficiency is higher.

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

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

s1, raw material weighing line: weighing a certain mass of Ca (OH)₂SDS desulfurized waste residue, KMnO₄Diatomaceous earth, PEO (polyethylene oxide), CaCl₂Aluminum sol raw material;

s2, kneading line: mixing and kneading: adding water into the raw materials in a kneader and mixing to form uniformly dispersed wet blanks;

s3, drying, crushing, screening and grinding control line: conveying the wet blank body into a dryer through a belt conveyor for drying to obtain a dry blank body, cooling, crushing, screening and grinding into a calcium-based synchronous desulfurization and denitrification agent superfine powder finished product;

preferably, the Ca (OH) in the step S1₂Is powder with the granularity of about 300 meshes and the purity of about 90 percent;

preferably, in the step S1, the SDS desulfurization waste residue mainly contains NaHCO₃、Na₂CO₃、Na₂SO₄、Na₂SO₃Industrial solid waste;

preferably, the Ca (OH) in the step S1₂SDS desulfurized waste residue, KMnO₄Diatomaceous earth, PEO (polyethylene oxide), CaCl₂And the mass ratio of the aluminum sol to the aluminum sol is 40: 30: (0-15): 10: 5: 4: 1;

preferably, in the step S1, the mass ratio of the KMnO4 is increased, the denitration efficiency is increased, or the amount of the denitration agent is reduced;

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

preferably, the dried blank in step S3 is crushed by a crusher, and after sieving, the particle material with a particle size below 2mm is sent to a grinder for grinding to obtain calcium-based synchronous desulfurization and denitrification agent ultrafine powder with a particle size of about 25 μm, and the large particle material on the sieve is returned to the crusher for continuous crushing.

The calcium-based synchronous desulfurization and denitrification agent obtained by the preparation method of the calcium-based synchronous desulfurization and denitrification agent has desulfurization and denitrification efficiencies respectively higher than 98% and 80%, and is suitable for wide temperature window of flue gas and SO₂And NO_xMeeting the requirement of ultra-low emission.

The invention has the beneficial effects that:

1. the preparation method of the calcium-based synchronous desulfurization and denitrification agent adopts Ca (OH)₂SDS desulfurized waste residue, KMnO₄Diatomaceous earth, PEO (polyethylene oxide), CaCl₂Alumina sol as raw material KMnO₄Oxidizing NO in the flue gas to NO₂、NO₃、N₂O₅Equal valence state NO_xIn flue gasSO₂And NO₂With Ca (OH) in the desulfurization and denitrification agent₂Na in SDS desulfurization waste residue₂CO₃The alkaline substances are subjected to chemical reaction to achieve the aim of synchronous desulfurization and denitrification;

2. the preparation method of the calcium-based synchronous desulfurization and denitrification agent adopts Ca (OH)₂SDS desulfurized waste residue, KMnO₄Diatomaceous earth, PEO (polyethylene oxide), CaCl₂The aluminum sol is taken as a raw material, and the SDS desulfurization waste residue contains NaHCO₃NaHCO in the course of drying at 100 deg.C₃Decomposition reaction to form CO₂Gas escapes from the desulfurization and denitrification agent particles, so that the number of pores and the specific surface area of the particles are increased, the desulfurization and denitrification reaction is promoted, and the comprehensive utilization of waste is realized;

3. the calcium-based synchronous desulfurization and denitrification agent is ultrafine powder with the particle size of about 25 mu m, has large specific surface area, desulfurization efficiency of more than 98 percent and denitrification efficiency of more than 80 percent, has wider temperature window (100-240 ℃) for desulfurization and denitrification reaction, and greatly reduces investment and operation cost;

4. the invention relates to a preparation method of a calcium-based particle synchronous desulfurization and denitrification agent, which adopts Ca (OH)₂SDS desulfurized waste residue, KMnO₄Diatomaceous earth, PEO (polyethylene oxide), CaCl₂The aluminum sol is used as a raw material, and the PEO and the aluminum sol are used as forming aids, so that the mechanical strength and the binding power of the calcium-based synchronous desulfurization and denitrification agent are obviously enhanced.

Drawings

The embodiments of the present invention will be described in detail, for the purpose of reading and understanding by those skilled in the art, with reference to the following drawings, but the present invention is only a part of the best embodiments and the protection and scope of the present invention is not limited thereto:

FIG. 1 is a process flow chart of the method for preparing the calcium-based synchronous desulfurization and denitrification agent.

Detailed Description

As shown in fig. 1, the method for preparing the calcium-based synchronous desulfurization and denitrification agent provided by the invention is characterized in that:

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

s1, raw material weighing line: weighing a certain mass of Ca (OH)₂SDS desulfurized waste residue, KMnO₄Diatomaceous earth, PEO (polyethylene oxide), CaCl₂Aluminum sol raw material;

Ca(OH)₂is powder with granularity of about 300 meshes and purity of about 90 percent, and the main component of the SDS desulfurization waste residue is NaHCO₃、Na₂CO₃、Na₂SO₄、Na₂SO₃Industrial solid waste;

Ca(OH)₂is powder with granularity of about 300 meshes and purity of about 90 percent, and the main component of the SDS desulfurization waste residue is NaHCO₃、Na₂CO₃、Na₂SO₄、Na₂SO₃Industrial solid waste;

s2, kneading line: mixing and kneading: adding water into the raw materials in a kneader and mixing to form uniformly dispersed wet blanks;

s3, drying, crushing, screening and grinding control line: conveying the wet blank body into a dryer through a belt conveyor for drying to obtain a dry blank body, cooling, crushing, screening and grinding into a calcium-based synchronous desulfurization and denitrification agent superfine powder finished product;

and (2) continuously drying for 3 hours at the temperature of about 100 ℃ to obtain dry materials, crushing the dry materials by using a crusher, sieving, conveying granular materials with the particle size below 2mm below a sieve to a grinder for grinding to obtain calcium-based synchronous desulfurization and denitrification agent ultrafine powder with the particle size of about 25 mu m, and returning large granular materials on the sieve to the crusher for continuous crushing.

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

s1, raw material weighing line: weighing a certain mass of Ca (OH)₂SDS desulfurized waste residue, KMnO₄Diatomaceous earth, PEO (polyethylene oxide), CaCl₂And the aluminum sol raw material is 40: 30: 5: 10: 5: 4: 1;

s2, kneading line: mixing and kneading: adding water into the raw materials in a kneader and mixing to form uniformly dispersed wet blanks;

s3, drying, crushing, screening and grinding control line: conveying the wet blank body into a dryer through a belt conveyor for drying to obtain a dry blank body, cooling, crushing, screening and grinding into a calcium-based synchronous desulfurization and denitrification agent superfine powder finished product;

and (2) continuously drying for 3 hours at the temperature of about 100 ℃ to obtain dry materials, crushing the dry materials by using a crusher, sieving, conveying granular materials with the particle size below 2mm below a sieve to a grinder for grinding to obtain calcium-based synchronous desulfurization and denitrification agent ultrafine powder with the particle size of about 25 mu m, and returning large granular materials on the sieve to the crusher for continuous crushing.

Example 2

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

s1, raw material weighing line: weighing a certain mass of Ca (OH)₂SDS desulfurized waste residue, KMnO₄Diatomaceous earth, PEO (polyethylene oxide), CaCl₂And the aluminum sol raw material is 40: 30: 10: 10: 5: 4: 1;

s2, kneading line: mixing and kneading: adding water into the raw materials in a kneader and mixing to form uniformly dispersed wet blanks;

s3, drying, crushing, screening and grinding control line: conveying the wet blank body into a dryer through a belt conveyor for drying to obtain a dry blank body, cooling, crushing, screening and grinding into a calcium-based synchronous desulfurization and denitrification agent superfine powder finished product;

and (2) continuously drying for 3 hours at about 120 ℃ to obtain dry materials, crushing the dry materials by using a crusher, sieving, conveying granular materials with the particle size below 2mm below a sieve to a grinder for grinding to obtain calcium-based synchronous desulfurization and denitrification agent ultrafine powder with the particle size of about 25 mu m, and returning large granular materials on the sieve to the crusher for continuous crushing.

Example 3

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

s1, raw material weighing line: weighing a certain mass of Ca (OH)₂SDS desulfurized waste residue, KMnO₄Diatomaceous earth, PEO (polyethylene oxide), CaCl₂And the aluminum sol raw material is 40: 30: 15: 10: 5: 4: 1;

s2, kneading line: mixing and kneading: adding water into the raw materials in a kneader and mixing to form uniformly dispersed wet blanks;

s3, drying, crushing, screening and grinding control line: conveying the wet blank body into a dryer through a belt conveyor for drying to obtain a dry blank body, cooling, crushing, screening and grinding into a calcium-based synchronous desulfurization and denitrification agent superfine powder finished product;

and (2) continuously drying for 3 hours at the temperature of about 150 ℃ to obtain dry materials, crushing the dry materials by using a crusher, sieving, conveying granular materials with the particle size below 2mm below a sieve to a grinder for grinding to obtain calcium-based synchronous desulfurization and denitrification agent superfine powder with the particle size of about 25 mu m, and returning large granular materials on the sieve to the crusher for continuous crushing.