CN110681255A - Reactant for flue gas desulfurization and denitrification and preparation method thereof - Google Patents
Reactant for flue gas desulfurization and denitrification and preparation method thereof Download PDFInfo
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- CN110681255A CN110681255A CN201910903694.2A CN201910903694A CN110681255A CN 110681255 A CN110681255 A CN 110681255A CN 201910903694 A CN201910903694 A CN 201910903694A CN 110681255 A CN110681255 A CN 110681255A
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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
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/81—Solid phase processes
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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
- B01D53/60—Simultaneously removing sulfur oxides and nitrogen oxides
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- 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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- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
The invention relates to a reactant for flue gas desulfurization and denitrification, which comprises the following substances in parts by weight: 40-60 parts of calcium hydroxide or sodium hydroxide, 30-60 parts of fly ash or used desulfurizer and 2-10 parts of metal oxide additive. The invention also relates to a preparation method of the reactant for flue gas desulfurization and denitrification. The reactant prepared by the invention has the characteristics of desulfurization, denitrification, dust removal and odor removal, and can remove the pollution component SO in the flue gas2And simultaneously, the NOx purifies carbon black, dust, peculiar smell components and the like in the smoke. The reaction agent adopts sodium hydroxide or calcium hydroxide as an active component, so that the reaction capacity and the reaction rate of the reaction agent are ensured, the fly ash is used as a carrier, the specific surface area of the reaction agent is increased by utilizing water vapor activation, the contact area and the reaction rate with pollutants can be greatly increased, the service life of the reaction agent is prolonged, and the mesoporous structure improves the reaction rate to particles and peculiar smellAdsorption effect of macromolecules.
Description
Technical Field
The invention belongs to the technical field of flue gas desulfurization, denitrification and purification, and particularly relates to a reactant for flue gas desulfurization and denitrification and a preparation method thereof.
Background
The simultaneous desulfurization and denitration technology for flue gas is mostly in research and industrial demonstration stages at present, but because the simultaneous desulfurization and denitration can be realized in one set of system, in particular with SO2、NOXThe control standard is becoming more and more strict, and the desulfurization and denitrification technology is receiving increasing attention from various countries. The simultaneous flue gas desulfurization and denitration technology mainly comprises three types, wherein the first type is a combined technology of flue gas desulfurization and flue gas denitration; the second is the use of adsorbentsSimultaneous removal of SOXAnd NOX(ii) a The third type is to modify the existing Flue Gas Desulfurization (FGD) system (such as adding a denitration agent into a desulfurization solution) and add a denitration function.
SO in boiler flue gas of thermal power plantXAnd NOXIs not high, but the total amount is large. If two sets of devices are used for desulfurization and denitration respectively, the occupied area is large, and the investment, management and operation cost is high. In recent years, research and development of simultaneous desulfurization and denitrification technologies have been carried out in various countries in the world, particularly in industrially developed countries, and certain industrial applications have been carried out. According to statistics of American electric power research institutions, more than 60 novel technologies for simultaneous desulfurization and denitrification exist at present, namely SOX/NOXIn the combined removal technology, some adopt the combined technology of flue gas desulfurization and flue gas denitrification, and some utilize the adsorbent to simultaneously remove SOXAnd NOXThe technology can achieve a certain removing effect. But now with simultaneous removal of SOXAnd NOXThe cost of the adsorbent is high, and the desulfurization and denitrification efficiency is still low.
Disclosure of Invention
The invention overcomes the defects in the prior art and provides the low-cost and high-efficiency desulfurization and denitrification reactant and the preparation method thereof.
The specific technical scheme of the invention is as follows:
a reactant for flue gas desulfurization and denitrification comprises the following substances in parts by weight: 40-60 parts of calcium hydroxide or sodium hydroxide, 30-60 parts of fly ash or used desulfurizer and 2-10 parts of metal oxide additive; the metal in the metal oxide is selected from one or more than two of metal 1 or/and metal 2 and mixed in any proportion; the metal 1 is strontium, rubidium and zirconium, and the metal 2 is iron, vanadium, copper, manganese, tungsten and molybdenum.
Preferably, the metal in the metal oxide consists of metal 1 and metal 2 according to the mass ratio of 2-4: 5-6. The metal 1 is adopted to enrich oxygen, enhance the structural strength of a reactant, increase the reaction activity and promote the conversion and absorption efficiency of sulfur dioxide; the metal 2 is used for enhancing the reaction rate and further converting NO of the smoke into NO2Then passing through the active componentAbsorption reaction is carried out, and the desulfurization and denitrification effects are improved.
The invention also relates to a preparation method of the reactant for flue gas desulfurization and denitrification, which comprises the following steps:
(1) preparing a nitrate solution of an auxiliary agent with the mass concentration of 20-40%, adjusting the pH value of the nitrate solution of the auxiliary agent to be alkaline, obtaining a precipitate after the nitrate solution of the auxiliary agent is precipitated, and drying the precipitate to obtain an auxiliary agent mixture; (2) mixing calcium hydroxide or sodium hydroxide, fly ash or a used desulfurizer and an auxiliary agent mixture, and then performing ball milling and mixing by using a dry method to obtain powder after ball milling; (3) adding water into the ball-milled powder, uniformly stirring, pressing into a strip-shaped desulfurizer, and solidifying and molding; (4) carrying out water vapor activation on the solidified and molded strip-shaped desulfurizer by using water vapor to obtain an activated desulfurizer; (5) and roasting the activated desulfurizer to obtain a finished product reactant.
Preferably, the mass concentration of the nitrate solution of the auxiliary agent is 20-40%.
In order to facilitate uniform mixing of subsequent materials, preferably, the precipitate is dried at 60-120 ℃ for 1-2h in the step (1) to obtain the assistant mixture.
In order to improve the structural strength and the friction resistance of the desulfurizing agent, the granularity of the powder after ball milling in the step (2) is preferably 100-200 meshes.
In order to facilitate the subsequent shaping of the desulfurizer, preferably, the water added in the step (3) accounts for 1/4 of the powder after ball milling, and the grain diameter of the strip desulfurizer isThe length is 15-20 mm.
In order to increase the internal pore structure of the reactant to the maximum extent, improve the activation effect and facilitate the flue gas pollutants to enter the pore structure for full reaction; preferably, in the step (4), the solidified and formed strip-shaped desulfurizer is placed into an atmosphere rotary furnace, activated gas is water vapor, the temperature is increased to 300-350 ℃ within 10-30 min, the temperature is kept for activation for 15-25min, and the cooled desulfurizer is taken out.
In order to increase the internal pore structure of the reactant to the maximum extent, improve the activation effect and facilitate the flue gas pollutants to enter the pore structure for full reaction; preferably, in the step (4), the rotating speed of the atmosphere rotary furnace is 5-8 r/h, and the lifting angle is 5-10 degrees.
Preferably, in the step (5), the roasting temperature is 300-500 ℃, and the roasting time is 3-5 h; the calcination temperature and time are for not damaging the molded desulfurizing agent and for facilitating the formation of a pore structure.
The invention improves the pore structure of the reactant by steam activation of the reactant at medium temperature, increases the number of mesopores, particularly reduces the number of pores below 100nm, obviously increases the number of mesopores with the size of 100-5000nm, and can increase SO2The NOx and the peculiar smell molecules are fully contacted and reacted with the active component, so that the diffusion resistance of the reactant filler layer is weakened; further improving the efficiency of flue gas desulfurization and denitrification, dust removal and peculiar smell removal.
The advantages of the reactant prepared by the invention mainly include the following aspects:
(1) the reactant has the characteristics of desulfurization, denitrification, dust removal and odor removal, and can remove the pollution component SO in the flue gas2And simultaneously, the NOx purifies carbon black, dust, peculiar smell components and the like in the smoke.
(2) The reaction agent adopts sodium hydroxide or calcium hydroxide as an active component, so that the reaction capacity and the reaction rate of the reaction agent are ensured, the fly ash is used as a carrier, the specific surface area of the reaction agent is increased by utilizing water vapor activation, the contact and reaction rate with pollutants can be greatly improved, the service life of the reaction agent is prolonged, and the adsorption effect on particulate matters and peculiar smell macromolecules is improved due to the mesoporous structure.
(3) The synthesis cost of the reactant is low, the raw material source is wide, the fly ash can be changed into valuable, the used reactant can be reused for preparing the reactant or used as a building material, and the application of the desulfurizer can realize good economic benefit and environmental benefit.
(4) The reaction agent can adjust the proportion of the carrier, the active component, the auxiliary agent and other trace additives according to the characteristics of the flue gas, so that the optimal effects of desulfurization, denitrification, dust removal and odor removal are achieved, the aims of desulfurization, denitrification, dust removal and odor removal are fulfilled simultaneously, and the construction and operation cost of the existing flue gas treatment industry is greatly reduced.
Detailed Description
The fly ash is fine ash collected from flue gas generated after coal combustion, and is main solid waste discharged from a coal-fired power plant. The main oxide composition of the fly ash of the thermal power plant in China is as follows: SiO 22、Al2O3、FeO、Fe2O3、CaO、TiO2And the like. The fly ash particles are in a porous honeycomb structure, have large specific surface area and high adsorption activity, and have the particle size range of 0.5-300 mu m. And the bead wall has a porous structure, the porosity is as high as 50-80%, and the water absorption is strong.
The reactant mainly utilizes raw materials such as calcium hydroxide (sodium hydroxide), fly ash or used desulfurizer, auxiliary agent and the like, wherein the calcium hydroxide mainly provides effective active components such as calcium base, fly ash or used desulfurizer as a carrier, alumina, silicon dioxide and trace elements provide carriers of the reactant, and the auxiliary agent mainly accelerates SO2And NOx conversion and absorption efficiency.
The invention utilizes the fly ash of a power plant or a used desulfurizer as a raw material to synthesize the reaction agent which can be simultaneously used for integrating the functions of desulfurization, denitrification, dust removal and odor removal of flue gas, the reaction agent can utilize raw materials such as calcium base, fly ash and auxiliary agent in a resource way to synthesize the high-efficiency reaction agent of flue gas with low cost, and the reaction agent can be widely applied to the fields of desulfurization, denitrification, ultralow emission, dust removal and odor removal and the like of coal-fired power plants, metallurgy, coking and chemical flue gas. The reactant can be repeatedly used for resynthesis of the reactant and recycled as a building material after flue gas purification, thereby achieving the purposes of energy conservation and emission reduction. The invention has the characteristics of low raw material cost, simple preparation, high desulfurization and denitrification efficiency, wide application range and the like. Compared with the currently generally used wet method, the application and popularization of the reactant have the advantages of no generation of waste water, no need of de-whitening of flue gas, suitability for high-temperature and low-temperature flue gas conditions, low cost, and no limitation of temperature difference, humidity and flue gas types.
The present invention is further illustrated below with reference to specific examples, which are not part of the present invention but are prior art.
Example 1
A preparation method of a reactant for flue gas desulfurization and denitrification comprises the following steps:
(1) weighing 12g of ferric oxide, dissolving the ferric oxide in 100mL of nitric acid solution with the mass concentration of 5%, weighing 3g of zirconium nitrate pentahydrate, dissolving the zirconium nitrate pentahydrate in 200mL of deionized water, mixing the two solutions, stirring the two solutions at 45 ℃ until the two solutions are completely dissolved, adjusting the pH value of the mixed solution to 12 by using NaOH solution, stopping adding alkali, standing for 2h, filtering the precipitate, and drying the precipitate at 120 ℃ for 1h to obtain an auxiliary agent mixture.
(2) Weighing 120g of calcium hydroxide and 165g of fly ash, putting the calcium hydroxide and the fly ash into a quartz mortar for primary crushing, putting the auxiliary mixture into the mortar for uniform mixing, then putting the mixture into a ball mill, setting the ball milling speed at 300r/min, grinding for 4 hours, taking the mixture out for later use, putting the ground powder into a 200-mesh sieve for sieving, and obtaining the powder material with the granularity of 100-mesh and 200-mesh after ball milling.
(3) Adding deionized water into the ball-milled powder, stirring and mixing, adding 1/4 mass of the deionized water accounting for the ball-milled powder, putting the wet material into a strip extruding machine for extrusion molding to obtain a strip-shaped wet finished product with the particle size of 6mm, standing for 1h, and then solidifying and molding.
(4) And (3) putting the solidified and molded strip-shaped desulfurizer into an atmosphere rotary furnace, heating to 300 ℃ within 10min by using water vapor as activating gas, activating for 20min at the rotating speed of 5r/h and the lifting angle of 5 ℃, and taking out after cooling.
(5) And (3) roasting the activated desulfurizer in a box type furnace at 400 ℃ for 4h, and then taking out and cooling to obtain the finished reactant.
Comparative example 1
Comparative example 1 differs from example 1 in that the starting material is different and consists of the following materials in mass fraction: 50% of calcium hydroxide, 42% of kaolin, 8% of ferric oxide and zirconia auxiliary agent, wherein the mass ratio of ferric oxide to zirconia in the auxiliary agent is 12: 1.
The performance of the finished reactant is tested by an analytical instrument, and the physicochemical properties of the finished reactant prepared by the method are shown in table 1.
TABLE 1
The measured radial crushing resistance of the desulfurizing agent is 105N/cm, and the particle density is 750 kg.m-3A specific surface area of 200m2(ii) in terms of/g. The flow velocity of the simulated flue gas is 0.25m/s, and the space velocity of the desulfurizing agent is 550h-1. Inlet flue gas SO2The concentration is 185mg/m3The concentration of the particles is 30mg/m3The concentration of nitrogen oxide is 400mg/m3The temperature of the flue gas is 250 ℃, the water content is 12.1 percent, the indexes after the flue gas is purified are the sulfur dioxide emission concentration<10mg/m3Concentration of particulate matter discharged<5mg/m3Concentration of nitrogen oxides emitted<120mg/m3The desulfurization efficiency is not lower than 94.6%, the dust removal efficiency is not lower than 83%, and the nitrogen oxide removal efficiency is not lower than 70%.
Example 2
A preparation method of a reactant for flue gas desulfurization and denitrification comprises the following steps:
(1) weighing 28g of zirconium nitrate pentahydrate, dissolving in 300mL of deionized water, and stirring at 45 ℃ until the zirconium nitrate pentahydrate is completely dissolved; copper nitrate (Cu (NO) with a concentration of 0.15mol/L is prepared3)2·3H2O, 98% analytical purity), taking 500mL of copper nitrate solution, pouring into zirconium nitrate solution for mixing, adjusting the pH value of the mixed solution to 11 by using NaOH solution, stopping adding alkali, standing, filtering the precipitate, and drying the precipitate at 80 ℃ for 1.5h to obtain an auxiliary agent mixture.
(2) Weighing 100g of calcium hydroxide and 120g of fly ash, putting the calcium hydroxide and the fly ash into a quartz mortar for primary crushing, putting the auxiliary agent mixture into the mortar for uniform mixing, then putting the mixture into a ball mill, setting the ball milling speed at 300r/min, grinding for 4h, taking out for later use, putting the ground powder into a 200-mesh sieve for sieving, and obtaining the powder material with the granularity of 100-mesh and 200-mesh after ball milling.
(3) Adding deionized water into the ball-milled powder, stirring and mixing, adding 1/4 mass of the deionized water accounting for the ball-milled powder, putting the wet material into a strip extruding machine for extrusion molding to obtain a strip-shaped wet finished product with the particle size of 8mm, standing for 1h, and then solidifying and molding.
(4) And (3) putting the solidified and molded strip-shaped desulfurizer into an atmosphere rotary furnace, heating to 350 ℃ within 20min by using water vapor as activating gas, activating for 25min, rotating at the speed of 8r/h at the lifting angle of 10 ℃, and taking out after cooling.
(5) And (3) roasting the activated desulfurizer in a box type furnace at 500 ℃ for 5h, and then taking out and cooling to obtain the finished reactant.
Comparative example 2
A preparation method of a reactant for flue gas desulfurization and denitrification comprises the following steps:
(1) weighing 28g of zirconium nitrate pentahydrate, dissolving in 300mL of deionized water, and stirring at 45 ℃ until the zirconium nitrate pentahydrate is completely dissolved; copper nitrate (Cu (NO) with a concentration of 0.15mol/L is prepared3)2·3H2O, 98% analytical purity), taking 500mL of copper nitrate solution, pouring into zirconium nitrate solution for mixing, adjusting the pH value of the mixed solution to 11 by using NaOH solution, stopping adding alkali, standing, filtering the precipitate, and drying the precipitate at 80 ℃ for 1.5h to obtain an auxiliary agent mixture.
(2) Weighing 100g of calcium hydroxide and 120g of fly ash, putting the calcium hydroxide and the fly ash into a quartz mortar for primary crushing, putting the auxiliary agent mixture into the mortar for uniform mixing, then putting the mixture into a ball mill, setting the ball milling speed at 300r/min, grinding for 4h, taking out for later use, putting the ground powder into a 200-mesh sieve for sieving, and obtaining the powder material with the granularity of 100-mesh and 200-mesh after ball milling.
(3) Adding deionized water into the ball-milled powder, stirring and mixing, adding 1/4 mass of the deionized water accounting for the ball-milled powder, putting the wet material into a strip extruding machine for extrusion molding to obtain a strip-shaped wet finished product with the particle size of 8mm, standing for 1h, and then solidifying and molding.
(4) And (3) roasting the solidified and molded strip desulfurizer in a box type furnace at 500 ℃ for 5h, and then taking out and cooling to obtain the finished reactant.
The performance of the finished reactant is detected by an analyzer, and the physicochemical properties of the finished reactant prepared by the method are shown in table 2.
TABLE 2
The measured radial crushing resistance of the desulfurizer is 125N/cm, and the particle density is 980 kg.m-3Specific surface area of 185m2(ii) in terms of/g. The flow velocity of the simulated flue gas is 0.2m/s, and the space velocity is 300h-1. Inlet flue gas SO2The concentration is 200mg/m3，NOxThe concentration is 350mg/m3The content of the particles is not more than 20mg/m3Flue gas temperature of 290 ℃, water content of 8.1 percent, index after flue gas purification, SO2Emission concentration of<20mg/m3Emission concentration of NOx<100mg/m3The emission concentration of the particulate matters is lower than 5mg/m3The desulfurization efficiency is not lower than 90%, the denitration efficiency is not lower than 71.4%, and the dust removal efficiency is 75%.
Example 3
A preparation method of a reactant for flue gas desulfurization and denitrification comprises the following steps:
(1) weighing 3g of manganese dioxide, dissolving the manganese dioxide in 100mL of nitric acid solution with the mass concentration of 5%, weighing 14g of zirconium nitrate pentahydrate, dissolving the zirconium nitrate pentahydrate in 200mL of deionized water, weighing 3g of vanadium pentoxide, grinding, adding the vanadium pentoxide into the solution, stirring and dissolving, mixing the two solutions, stirring at 45 ℃ until the two solutions are completely dissolved, adjusting the pH value of the mixed solution to 12 by using NaOH solution, stopping adding alkali, standing for 2h, filtering the precipitate, and drying the precipitate at 120 ℃ to obtain an auxiliary agent mixture.
(2) Weighing 120g of calcium hydroxide and 165g of fly ash, putting the calcium hydroxide and the fly ash into a quartz mortar for primary crushing, putting the auxiliary mixture into the mortar for uniform mixing, then putting the mixture into a ball mill, setting the ball milling speed at 300r/min, grinding for 4 hours, taking the mixture out for later use, putting the ground powder into a 200-mesh sieve for sieving, and obtaining the powder material with the granularity of 100-mesh and 200-mesh after ball milling.
(3) Adding deionized water into the ball-milled powder, stirring and mixing, adding 1/4 mass of the deionized water accounting for the ball-milled powder, putting the wet material into a strip extruding machine for extrusion molding to obtain a strip-shaped wet finished product with the particle size of 6mm, standing for 1h, and then solidifying and molding.
(4) And (3) putting the solidified and molded strip-shaped desulfurizer into an atmosphere rotary furnace, heating to 300 ℃ within 10min by using water vapor as activating gas, activating for 20min at the rotating speed of 5r/h and the lifting angle of 5 ℃, and taking out after cooling.
(5) And (3) roasting the activated desulfurizer in a box type furnace at 400 ℃ for 4h, and then taking out and cooling to obtain the finished reactant.
The measured radial crushing resistance of the desulfurizing agent is 100N/cm, and the particle density is 850 kg.m-3Specific surface area 175m2(ii) in terms of/g. The flow velocity of the simulated flue gas is 0.3m/s, and the space velocity of the desulfurizing agent is 650h-1. Inlet flue gas SO2The concentration is 185mg/m3The concentration of the particles is 30mg/m3The concentration of nitrogen oxide is 400mg/m3The temperature of the flue gas is 150 ℃, the water content is 12.1 percent, the indexes after the flue gas is purified are the sulfur dioxide emission concentration<10mg/m3Concentration of particulate matter discharged<5mg/m3Concentration of nitrogen oxides emitted<100mg/m3The desulfurization efficiency is not lower than 91.9%, the dust removal efficiency is not lower than 83%, and the nitrogen oxide removal efficiency is not lower than 75%.
Claims (9)
1. A reactant for flue gas desulfurization and denitrification is characterized by comprising the following substances in parts by weight: 40-60 parts of calcium hydroxide or sodium hydroxide, 30-60 parts of fly ash or used desulfurizer and 2-10 parts of metal oxide additive;
the metal in the metal oxide is selected from one or more than two of metal 1 or/and metal 2 and mixed in any proportion;
the metal 1 is strontium, rubidium and zirconium, and the metal 2 is iron, vanadium, copper, manganese, tungsten and molybdenum.
2. The reactant according to claim 1, wherein the metal in the metal oxide consists of metal 1 and metal 2 in a mass ratio of 2-4: 5-6.
3. A preparation method of a reactant for flue gas desulfurization and denitrification is characterized by comprising the following steps:
(1) preparing a nitrate solution of the auxiliary agent, adjusting the pH value of the nitrate solution of the auxiliary agent to be alkaline, obtaining a precipitate after the nitrate solution of the auxiliary agent is precipitated, and drying the precipitate to obtain an auxiliary agent mixture;
(2) mixing calcium hydroxide or sodium hydroxide, fly ash or a used desulfurizer and an auxiliary agent mixture, and then performing ball milling and mixing by using a dry method to obtain powder after ball milling;
(3) adding water into the ball-milled powder, uniformly stirring, pressing into a strip-shaped desulfurizer, and solidifying and molding;
(4) carrying out water vapor activation on the solidified and molded strip-shaped desulfurizer by using water vapor to obtain an activated desulfurizer;
(5) and roasting the activated desulfurizer to obtain a finished product reactant.
4. The preparation method according to claim 3, wherein in the step (1), the precipitate is dried at 60-120 ℃ for 1-2h to obtain the auxiliary mixture.
5. The preparation method according to claim 4, wherein the particle size of the powder after ball milling in step (2) is 100-200 mesh.
6. The preparation method according to claim 5, wherein the water added in the step (3) accounts for 1/4 mass of the powder after ball milling, and the grain diameter of the strip-shaped desulfurizing agent isThe length is 15-20 mm.
7. The preparation method according to claim 6, wherein in the step (4), the solidified and formed strip-shaped desulfurizer is put into an atmosphere rotary furnace, the activating gas is water vapor, the temperature is raised to 300-350 ℃ within 10-30 min, the temperature is maintained for activation for 15-25min, and the desulfurizer is taken out after cooling.
8. The preparation method according to claim 7, wherein in the step (4), the rotation speed of the atmosphere rotary kiln is 5-8 r/h, and the lifting angle is 5-10 degrees.
9. The preparation method according to claim 7 or 8, wherein the roasting temperature in the step (5) is 300-500 ℃ and the roasting time is 3-5 hours.
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| CN111514748A (en) * | 2020-04-30 | 2020-08-11 | 南京中研科技有限公司 | Wide-temperature flue gas dry desulfurizing agent for moving bed process and preparation method thereof |
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