CN112121581A - Industrial tail gas treatment system - Google Patents
Industrial tail gas treatment system Download PDFInfo
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- CN112121581A CN112121581A CN202011010487.3A CN202011010487A CN112121581A CN 112121581 A CN112121581 A CN 112121581A CN 202011010487 A CN202011010487 A CN 202011010487A CN 112121581 A CN112121581 A CN 112121581A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
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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
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
- B01D53/504—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific device
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
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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
- B01D53/86—Catalytic processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
- B01J27/14—Phosphorus; Compounds thereof
- B01J27/185—Phosphorus; Compounds thereof with iron group metals or platinum group metals
- B01J27/1856—Phosphorus; Compounds thereof with iron group metals or platinum group metals with platinum group metals
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/30—Alkali metal compounds
- B01D2251/304—Alkali metal compounds of sodium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/606—Carbonates
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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
- Y02A50/2351—Atmospheric particulate matter [PM], e.g. carbon smoke microparticles, smog, aerosol particles, dust
Abstract
The invention relates to the field of tail gas treatment devices, in particular to an industrial tail gas treatment system which comprises a pretreatment unit, a tail gas catalytic device, a sulfur removal device and a grease removal device which are sequentially arranged along the conveying direction of industrial waste gas. Compared with the prior art, the industrial tail gas treatment system provided by the invention has the advantages that the industrial waste gas is subjected to primary separation and forced separation treatment, gas pollutants such as sulfur dioxide and nitrogen oxides in the industrial waste gas and particle pollution of particle pollutants are removed, the removal efficiency can reach more than 98%, the removal efficiency of acid gases such as sulfur dioxide and nitrogen oxides in the waste gas can reach more than 95%, secondary dust removal treatment of the tail gas is realized by cyclone separation dust removal and electrostatic dust removal of the tail gas, and meanwhile, the VOC in the tail gas is purified by the catalyst formed by loading the calcium-titanium type rare earth composite oxide on the carrier, so that the flue gas treatment amount is large, the dust collection efficiency is high, the catalytic efficiency is high, the service life is long, and the maintenance cost is low.
Description
Technical Field
The invention relates to the field of tail gas treatment devices, in particular to an industrial tail gas treatment system.
Background
The industrial tail gas refers to a general term of various pollutant-containing gases discharged into the air during the fuel combustion and production process in an enterprise factory, and comprises particulate matters such as PM2.5, SOx, NOx, VOCs, COx, H2S and the like. With the enhancement of the environmental awareness of people, the harm of industrial tail gas to natural environment and organisms is more and more concerned, and accordingly, the industrial tail gas treatment technology is continuously improved and innovated. However, carbon monoxide, hydrogen, methane, other sulfur and nitrogen pollutants in the existing industrial tail gas cannot be effectively treated, the tail gas treatment effect is poor, the adsorption amount of smoke dust is low, and the tail gas discharged into the air still contains more pollutants and causes harm to human bodies. At present, when industrial waste gas is treated, pure filtration adsorption and ionization decomposition methods are mostly adopted for treatment, however, the treatment effect is poor, the aim of multi-stage comprehensive treatment of the industrial waste gas cannot be achieved, grading, flow and thorough treatment of fixed particles, harmful substances and organic gas in the industrial waste gas cannot be achieved, pollution of the industrial waste gas to the external air environment cannot be avoided, and the aim of environmental protection cannot be achieved. These treatment methods have poor comprehensive effects on the treatment of industrial exhaust gases having complex components. Therefore, how to improve the system to improve the comprehensive treatment effect is a technical problem to be solved in the field at present.
Disclosure of Invention
In order to solve the technical problems, the invention provides an industrial tail gas treatment system, which solves the technical problems that the single-stage treatment effect of tail gas is not ideal enough and the emission does not reach the low emission requirement.
The technical scheme adopted by the invention is as follows: the key of the industrial tail gas treatment system is as follows: the system comprises a pretreatment unit, a tail gas catalytic device, a sulfur removal device and a grease removal device which are sequentially arranged along the conveying direction of industrial waste gas;
tail gas catalytic unit includes the tower body, the tower body middle part is equipped with the baffle, the baffle will the tower body divide into catalysis gas purification district and lower dust disengagement zone, go up catalysis gas purification district and communicate through a center section of thick bamboo between the lower dust disengagement zone, be equipped with electrostatic precipitator device in the center section of thick bamboo, tower body upper portion and lower part are equipped with outlet duct and intake pipe respectively, go up in the catalysis gas purification district from last to being equipped with multilayer annular frame down, the annular frame is fixed to be set up a center section of thick bamboo with between the tower body, be equipped with the carrier in the annular frame, the load has calcium titanium type rare earth composite oxide on the carrier.
Preferably, the pretreatment unit comprises a water mist generation device, a charge generation device and an aerosol mixing reactor which are sequentially connected through pipelines.
Preferably, the carrier is prepared by the following method: mixing Ca (NO)3)2·4H2Dissolving O in water to prepare calcium nitrate solution with mass concentration of 0.1-1mol/L, keeping the constant temperature at 45 ℃, and adding H with mass concentration of 0.3mol/L3PO4Dropwise adding into calcium nitrate solution, wherein the molar ratio of Ca to P is 1.5-2, after the dropwise adding is finished, violently stirring for 20-60min, adjusting the pH value to 8-10, continuously stirring for 1-2h, standing, filtering, washing and drying, grinding the dried product, putting the ground product into a die cavity, pressurizing to form a green blank, and calcining the green blank at the temperature of 200-700 ℃.
Preferably, the perovskite-type rare earth composite oxide is loaded on the carrier by the following method: dissolving lanthanum nitrate, strontium nitrate and cobalt nitrate in a molar ratio of 0.8:0.2:1 in deionized water, and uniformly stirring to obtain a La-Sr-Co solution with the mass concentration of 0.05-0.4 mol/L; adding PdCl into the La-Sr-Co solution2Uniformly mixing Pd and Co at a molar ratio of 1:5 to form an impregnation solution; the carrier is completely immersed in the impregnation liquid, dried for 12h at 120 ℃ after vacuum impregnation and calcined at 600-900 ℃.
Preferably, the pressing process is 1000kg/cm of pressing strength2Slowly and uniformly pressurizing, stopping pressurizing when the pressure rises to 14000kg, and keeping the pressure for 2-10 min.
Preferably, the vacuum impregnation is performed twice, and each impregnation time is 1 h.
Preferably, a conical cylinder is arranged in the lower dust separation zone, the air inlet pipe is tightly attached to the inner wall of the lower dust separation zone, waste gas in the air inlet pipe enters from the top of the conical cylinder and spirally descends along the inner cylinder wall of the conical cylinder, and a vortex cover is arranged at the lower cylinder opening of the conical cylinder.
Preferably, the upper opening of the center cylinder is fixedly connected with the top of the tower body, the lower opening of the center cylinder extends into the conical cylinder, the industrial tail gas treatment system comprises an electrode rod, the electrode rod and the center cylinder are coaxially arranged, a plurality of electrode plates are distributed on the electrode rod, an annular adsorption plate is arranged between the electrode rod and the center cylinder, the annular adsorption plate is connected with the center cylinder through a flange, and adsorption holes are densely distributed in the annular adsorption plate.
Preferably, the air outlet pipe is positioned below the carrier at the lowest layer, the bottom of the tower body is provided with an ash collecting port, and the ash collecting port is communicated with the lower opening of the conical cylinder.
Preferably, the sulfur removal device comprises a first pool body, and saturated NaHCO is contained in the first pool body3A solution; the degreasing device comprises a second tank body, and a plurality of cooling pipes are further arranged in the second tank body.
Has the advantages that: compared with the prior art, the industrial tail gas treatment system provided by the invention has the advantages that the industrial waste gas is subjected to preliminary separation and forced separation treatment, gas pollutants such as sulfur dioxide and nitrogen oxides and particle pollutants in the industrial waste gas are removed, inhalable particle pollutants of PM10 and below in the air can be removed, the removal efficiency can reach more than 98%, and the removal efficiency of acid gases such as sulfur dioxide and nitrogen oxides in the waste gas can reach more than 95%; the industrial waste gas is loaded with charges opposite to the charged water mist through a pretreatment unit, then is mixed with the charged water mist and is primarily separated, and then is introduced into a tail gas catalytic device to carry out cyclone separation dust removal and electrostatic dust removal on the tail gas, so that secondary dust removal treatment on the tail gas is realized, the dust collection efficiency is high, the treated flue gas quantity is large, the service life is long, the maintenance cost is low, meanwhile, VOC in the tail gas is purified through a catalyst formed by loading a calcium-titanium type rare earth composite oxide on a carrier, and the carrier is calcined and formed at low temperature and is a needle-shaped hydroxyapatite crystal, so that the specific surface area of the carrier is greatly improved, and the dispersibility and the activity of the calcium-titanium type rare earth composite oxide on the surface of a substrate are; the perovskite type rare earth composite oxide is loaded on the carrier in a vacuum impregnation mode, so that the perovskite type rare earth composite oxide permeates into the matrix, the loading amount is up to 50%, and the loading times and the energy consumption in the production process are greatly reduced; in addition, the bonding strength of the perovskite type rare earth composite oxide and the carrier is improved, and the prepared catalyst has high catalytic activity, strong mechanical stability and sulfur resistance. The system for purifying the industrial waste gas can greatly reduce industrial energy consumption, has small occupied area, low investment cost, simple operation flow and convenient maintenance, and is used for ultra-clean treatment of the waste gas of chemical plants, coal-fired power plants, smelting plants, cement plants, biomass and domestic waste incineration power plants.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic structural view of the exhaust gas catalytic apparatus.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the present invention will be described in detail below with reference to the accompanying tables and specific embodiments.
Example 1
The industrial tail gas treatment system comprises a pretreatment unit a, a tail gas catalytic device b, a sulfur removal device c and a degreasing device d which are sequentially arranged along the conveying direction of industrial waste gas; the pretreatment unit a comprises a water mist generation device a1, a charge generation device a2 and an aerosol mixing reactor a3 which are sequentially connected through pipelines, the desulphurization device c comprises a pool body I, and saturated NaHCO is contained in the pool body I3A solution; the degreasing device d comprises a second tank body d1, and a plurality of cooling pipes d2 are arranged in the second tank body d 1;
the tail gas catalytic device b comprises a tower body 1, a partition plate 12 is arranged in the middle of the tower body 1, and the tower body 1 is divided into two parts by the partition plate 12Go up catalytic gas purification district and lower dust disengagement zone, go up catalytic gas purification district and lower dust disengagement zone between through center tube 2 intercommunication, dust collecting port 11 has been seted up to the bottom of tower body 1, tower body 1 upper portion and lower part are equipped with outlet duct 3 and intake pipe 4 respectively, from last to being equipped with multilayer annular frame down in going up the catalytic gas purification district, the annular frame is fixed to be set up center tube 2 with between the tower body 1, be equipped with carrier 6 in the annular frame, outlet duct 3 is located the lower floor carrier 6 below, the load has calcium titanium type rare earth composite oxide on carrier 6, be equipped with cone 7 in the lower dust disengagement zone, the last tube of center tube 2 with tower body 1 top fixed connection, the lower tube of center tube 2 stretches into in cone 7, be equipped with electrostatic precipitator 5 in the center tube 2, industry tail gas processing system includes electrode rod 9, the electrode rod 9 and the central cylinder 2 are coaxially arranged, a plurality of electrode plates 91 are distributed on the electrode rod 9, an annular adsorption plate 10 is arranged between the electrode rod 9 and the central cylinder 2, the annular adsorption plate 10 is connected with the central cylinder 2 through a flange, adsorption holes are densely distributed on the annular adsorption plate 10, the air inlet pipe 4 is tightly attached to the inner wall of the lower dust separation area, waste gas in the air inlet pipe 4 enters from the top of the conical cylinder 7 and spirally descends along the inner cylinder wall of the conical cylinder 7, a vortex cover 8 is arranged at the lower cylinder opening of the conical cylinder 7, and the dust collecting opening 11 is communicated with the lower cylinder opening of the conical cylinder 7; wherein, the perovskite type rare earth composite oxide is loaded on the carrier by the following method: mixing Ca (NO)3)2·4H2Dissolving O in water to prepare calcium nitrate solution with mass concentration of 0.1-1mol/L, keeping the constant temperature at 45 ℃, and adding H with mass concentration of 0.3mol/L3PO4Dropwise adding into calcium nitrate solution with Ca/P molar ratio of 1.5, stirring vigorously for 20-60min after dropwise adding, adjusting pH to 8, stirring for 1-2 hr, standing, filtering, washing, oven drying, grinding, placing into mold cavity, and pressing to 1000kg/cm2Slowly and uniformly pressurizing, stopping pressurizing when the pressure is raised to 14000kg, keeping the pressure for 2-10min, pressurizing to form a green embryo, and calcining the green embryo at 200 ℃ to form a carrier 6; lanthanum nitrate with a molar ratio of 0.8:0.2:1Dissolving strontium nitrate and cobalt nitrate in deionized water, and uniformly stirring to obtain a La-Sr-Co solution with the mass concentration of 0.05 mol/L; adding PdCl into the La-Sr-Co solution2Uniformly mixing Pd and Co at a molar ratio of 1:5 to form an impregnation solution; completely soaking the carrier in the soaking solution, vacuum soaking for 1 hr twice, drying at 120 deg.C for 12 hr, and calcining at 600 deg.C to obtain the final product with specific surface area of 85m2The loading amount is 40 percent per gram.
Example 2
The industrial tail gas treatment system comprises a pretreatment unit a, a tail gas catalytic device b, a sulfur removal device c and a degreasing device d which are sequentially arranged along the conveying direction of industrial waste gas; the pretreatment unit a comprises a water mist generation device a1, a charge generation device a2 and an aerosol mixing reactor a3 which are sequentially connected through pipelines, the desulphurization device c comprises a pool body I, and saturated NaHCO is contained in the pool body I3A solution; the degreasing device d comprises a second tank body d1, and a plurality of cooling pipes d2 are arranged in the second tank body d 1;
the tail gas catalytic device b comprises a tower body 1, a baffle plate 12 is arranged in the middle of the tower body 1, the baffle plate 12 divides the tower body 1 into a catalytic gas purification area and a lower dust separation area, the catalytic gas purification area and the lower dust separation area are communicated through a central cylinder 2, a dust collecting port 11 is formed in the bottom of the tower body 1, an outlet pipe 3 and an inlet pipe 4 are respectively arranged on the upper portion and the lower portion of the tower body 1, a multilayer annular frame is arranged in the catalytic gas purification area from top to bottom, the annular frame is fixedly arranged between the central cylinder 2 and the tower body 1, a carrier 6 is arranged in the annular frame, the outlet pipe 3 is positioned below the carrier 6 at the lowest layer, calcium-titanium rare earth composite oxide is loaded on the carrier 6, a conical cylinder 7 is arranged in the lower dust separation area, an upper cylinder port of the central cylinder 2 is fixedly connected with the top of the tower body 1, a lower cylinder port of the central cylinder 2 extends into the conical cylinder 7, an electrostatic dust removal device 5 is arranged in the central cylinder 2, the industrial tail gas treatment system comprises an electrode rod 9, the electrode rod 9 and the central cylinder 2 are coaxially arranged, a plurality of electrode plates 91 are distributed on the electrode rod 9, an annular adsorption plate 10 is arranged between the electrode rod 9 and the central cylinder 2, the annular adsorption plate 10 is connected with the central cylinder 2 through a flange, adsorption holes are densely distributed on the annular adsorption plate 10, the air inlet pipe 4 is tightly attached to the inner wall of the lower dust separation zone, waste gas in the air inlet pipe 4 enters from the top of the conical cylinder 7 and spirally descends along the inner cylinder wall of the conical cylinder 7, a vortex cover 8 is arranged at the lower cylinder opening of the conical cylinder 7, and the dust collecting opening 11 is communicated with the lower cylinder opening of the conical cylinder 7;
wherein, the perovskite type rare earth composite oxide is loaded on the carrier by the following method: mixing Ca (NO)3)2·4H2Dissolving O in water to prepare calcium nitrate solution with mass concentration of 0.1-1mol/L, keeping the constant temperature at 45 ℃, and adding H with mass concentration of 0.3mol/L3PO4Dropwise adding into calcium nitrate solution with Ca/P molar ratio of 2, stirring vigorously for 20-60min after dropwise adding, adjusting pH to 10, stirring for 1-2 hr, standing, filtering, washing, oven drying, grinding, placing into mold cavity, and pressing to 1000kg/cm2Slowly and uniformly pressurizing, stopping pressurizing when the pressure is raised to 14000kg, keeping the pressure for 2-10min, pressurizing to form a green embryo, and calcining the green embryo at 1100 ℃ to form a carrier 6; dissolving lanthanum nitrate, strontium nitrate and cobalt nitrate in a molar ratio of 0.8:0.2:1 in deionized water, and uniformly stirring to obtain a La-S r-Co solution with the mass concentration of 0.4 mol/L; adding PdCl into the La-Sr-Co solution2Uniformly mixing Pd and Co at a molar ratio of 1:5 to form an impregnation solution; completely soaking the carrier in the soaking solution, vacuum soaking for 1 hr twice, drying at 120 deg.C for 12 hr, and calcining at 900 deg.C to obtain a carrier with specific surface area of 92m2Catalyst loading was 43% per gram.
Example 3
The industrial tail gas treatment system comprises a pretreatment unit a, a tail gas catalytic device b, a sulfur removal device c and a degreasing device d which are sequentially arranged along the conveying direction of industrial waste gas; the pretreatment unit a comprises a water mist generation device a1, a charge generation device a2 and an aerosol mixing reactor a3 which are sequentially connected through pipelines, the desulphurization device c comprises a pool body I, and saturated NaHCO is contained in the pool body I3A solution; the degreasing device d comprisesA second tank body d1, wherein a plurality of cooling pipes d2 are arranged in the second tank body d 1;
the tail gas catalytic device b comprises a tower body 1, a baffle plate 12 is arranged in the middle of the tower body 1, the baffle plate 12 divides the tower body 1 into a catalytic gas purification area and a lower dust separation area, the catalytic gas purification area and the lower dust separation area are communicated through a central cylinder 2, a dust collecting port 11 is formed in the bottom of the tower body 1, an outlet pipe 3 and an inlet pipe 4 are respectively arranged on the upper portion and the lower portion of the tower body 1, a multilayer annular frame is arranged in the catalytic gas purification area from top to bottom, the annular frame is fixedly arranged between the central cylinder 2 and the tower body 1, a carrier 6 is arranged in the annular frame, the outlet pipe 3 is positioned below the carrier 6 at the lowest layer, calcium-titanium rare earth composite oxide is loaded on the carrier 6, a conical cylinder 7 is arranged in the lower dust separation area, an upper cylinder port of the central cylinder 2 is fixedly connected with the top of the tower body 1, a lower cylinder port of the central cylinder 2 extends into the conical cylinder 7, an electrostatic dust removal device 5 is arranged in the central cylinder 2, the industrial tail gas treatment system comprises an electrode rod 9, the electrode rod 9 and the central cylinder 2 are coaxially arranged, a plurality of electrode plates 91 are distributed on the electrode rod 9, an annular adsorption plate 10 is arranged between the electrode rod 9 and the central cylinder 2, the annular adsorption plate 10 is connected with the central cylinder 2 through a flange, adsorption holes are densely distributed on the annular adsorption plate 10, the air inlet pipe 4 is tightly attached to the inner wall of the lower dust separation zone, waste gas in the air inlet pipe 4 enters from the top of the conical cylinder 7 and spirally descends along the inner cylinder wall of the conical cylinder 7, a vortex cover 8 is arranged at the lower cylinder opening of the conical cylinder 7, and the dust collecting opening 11 is communicated with the lower cylinder opening of the conical cylinder 7;
wherein, the perovskite type rare earth composite oxide is loaded on the carrier by the following method: mixing Ca (NO)3)2·4H2Dissolving O in water to prepare calcium nitrate solution with mass concentration of 0.1-1mol/L, keeping the constant temperature at 45 ℃, and adding H with mass concentration of 0.3mol/L3PO4Dropwise adding into calcium nitrate solution with Ca/P molar ratio of 1.8, stirring vigorously for 20-60min after dropwise adding, adjusting pH to 9, stirring for 1-2 hr, standing, filtering, washing, oven drying, grinding, and placing into moldThe pressure in the cavity is 1000kg/cm strong2Slowly and uniformly pressurizing, stopping pressurizing when the pressure is raised to 14000kg, keeping the pressure for 2-10min, pressurizing to form a green body, and calcining the green body at 700 ℃ to form the carrier 6; dissolving lanthanum nitrate, strontium nitrate and cobalt nitrate in a molar ratio of 0.8:0.2:1 in deionized water, and uniformly stirring to obtain a La-S r-Co solution with the mass concentration of 0.2 mol/L; adding PdCl into the La-Sr-Co solution2Uniformly mixing Pd and Co at a molar ratio of 1:5 to form an impregnation solution; completely soaking the carrier in the soaking solution, vacuum soaking for 1 hr twice, drying at 120 deg.C for 12 hr, and calcining at 700 deg.C to obtain a product with specific surface area of 100m2The catalyst loading was 50% per gram.
The invention is applied to the treatment of industrial tail gas, taking the example 3 as an example, the concentration of VOCs and the concentration of dust are measured:
smoke output of 5.6 ten thousand m in a certain smelting plant3H, the flue gas contains 8g/m of dust3，NOX1000ppm，O 29 percent and the ammonia-nitrogen ratio is 1. The emission test shows that the denitration rate is 95.5, and the dust content is less than or equal to 45mg/Nm3。
The smoke output of a certain smelting plant is 19 ten thousand meters3H, the smoke contains 15g/m of dust3，NOX2000ppm，O 26 percent and the ammonia-nitrogen ratio is 1.2. The emission test shows that the denitration rate is 96.1, and the dust content is less than or equal to 45mg/Nm3。
Smoke output of 68 ten thousand m in certain steel plant3H, the flue gas contains 28g/m of dust3，NOX2800ppm，O 212% ammonia-nitrogen ratio of 1.4, SO22700mg/m3. The emission test shows that the denitration rate is 98.5, and the dust content is less than or equal to 53mg/Nm3。
Finally, it should be noted that the above-mentioned description is only a preferred embodiment of the present invention, and those skilled in the art can make various similar representations without departing from the spirit and scope of the present invention.
Claims (10)
1. Industrial tail gas processing system, its characterized in that: the system comprises a pretreatment unit (a), a tail gas catalytic device (b), a sulfur removal device (c) and a degreasing device (d) which are sequentially arranged along the conveying direction of industrial waste gas;
tail gas catalytic unit (b) includes tower body (1), tower body (1) middle part is equipped with baffle (12), baffle (12) will tower body (1) divide into catalysis gas purification district and lower dust disengagement zone, go up and catalyze gas purification district and communicate through a central section of thick bamboo (2) down between the dust disengagement zone, be equipped with electrostatic precipitator device (5) in a central section of thick bamboo (2), tower body (1) upper portion and lower part are equipped with outlet duct (3) and intake pipe (4) respectively, upward be equipped with multilayer annular frame down in the catalysis gas purification district from last, the annular frame is fixed to be set up a central section of thick bamboo (2) with between tower body (1), be equipped with carrier (6) in the annular frame, the load has calcium titanium type rare earth composite oxide on carrier (6).
2. The industrial tail gas treatment system of claim 1, wherein: the pretreatment unit (a) comprises a water mist generation device (a1), a charge generation device (a2) and an aerosol mixing reactor (a3) which are connected in sequence through pipelines.
3. Industrial exhaust gas treatment system according to claim 1, characterized in that the carrier (6) is made by the following method: mixing Ca (NO)3)2·4H2Dissolving O in water to prepare calcium nitrate solution with mass concentration of 0.1-1mol/L, keeping the constant temperature at 45 ℃, and adding H with mass concentration of 0.3mol/L3PO4Dropwise adding into calcium nitrate solution, wherein the molar ratio of Ca to P is 1.5-2, after the dropwise adding is finished, violently stirring for 20-60min, adjusting the pH value to 8-10, continuously stirring for 1-2h, standing, filtering, washing and drying, grinding the dried product, putting the ground product into a die cavity, pressurizing to form a green blank, and calcining the green blank at the temperature of 200-700 ℃.
4. The industrial tail gas treatment system according to claim 1, wherein the perovskite-type rare earth composite oxide is loaded on the carrier by the following method: dissolving lanthanum nitrate, strontium nitrate and cobalt nitrate with the molar ratio of 0.8:0.2:1 in deionized water, and uniformly stirring to obtain a solution with the mass concentration of 005-0.4mol/L La-Sr-Co solution; adding PdCl into the La-Sr-Co solution2Uniformly mixing Pd and Co at a molar ratio of 1:5 to form an impregnation solution; the carrier is completely immersed in the impregnation liquid, dried for 12h at 120 ℃ after vacuum impregnation and calcined at 600-900 ℃.
5. The industrial tail gas treatment system of claim 2, wherein: the pressing strength is 1000kg/cm2Slowly and uniformly pressurizing, stopping pressurizing when the pressure rises to 14000kg, and keeping the pressure for 2-10 min.
6. The industrial tail gas treatment system of claim 3, wherein: the vacuum impregnation is carried out twice, and the impregnation time is 1h each time.
7. The industrial tail gas treatment system of claim 1, wherein: the lower dust separation area is internally provided with a conical cylinder (7), the air inlet pipe (4) is tightly attached to the inner wall of the lower dust separation area, waste gas in the air inlet pipe (4) enters from the top of the conical cylinder (7) and spirally descends along the inner cylinder wall of the conical cylinder (7), and a vortex cover (8) is arranged at the lower cylinder opening of the conical cylinder (7).
8. The industrial tail gas treatment system of claim 1, wherein: the upper cylinder mouth of a center section of thick bamboo (2) with tower body (1) top fixed connection, the lower cylinder mouth of a center section of thick bamboo (2) stretches into in toper section of thick bamboo (7), industrial tail gas processing system include electrode bar (9), electrode bar (9) with a center section of thick bamboo (2) coaxial setting, it has a plurality of electrode slices (91) to distribute on electrode bar (9), electrode bar (9) with be equipped with annular adsorption plate (10) between a center section of thick bamboo (2), annular adsorption plate (10) with a center section of thick bamboo (2) pass through flange joint, the dense absorption hole that has on annular adsorption plate (10).
9. The industrial tail gas treatment system of claim 1, wherein: the gas outlet pipe (3) is positioned at the lowest layer and below the carrier (6), the bottom of the tower body (1) is provided with a dust collecting port (11), and the dust collecting port (11) is communicated with the lower opening of the conical barrel (7).
10. The industrial tail gas treatment system of claim 1, wherein: the sulfur removal device (c) comprises a pool body I, wherein saturated NaHCO is contained in the pool body I3A solution; the degreasing device (d) comprises a second tank body (d1), and a plurality of cooling pipes (d2) are further arranged in the second tank body (d 1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011010487.3A CN112121581A (en) | 2020-09-23 | 2020-09-23 | Industrial tail gas treatment system |
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