CN114768411A - Diesel engine tail gas treatment process - Google Patents
Diesel engine tail gas treatment process Download PDFInfo
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- CN114768411A CN114768411A CN202210444420.3A CN202210444420A CN114768411A CN 114768411 A CN114768411 A CN 114768411A CN 202210444420 A CN202210444420 A CN 202210444420A CN 114768411 A CN114768411 A CN 114768411A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/10—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
- B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
- B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/30—Particle separators, e.g. dust precipitators, using loose filtering material
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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
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9404—Removing only nitrogen compounds
- B01D53/9409—Nitrogen oxides
- B01D53/9413—Processes characterised by a specific catalyst
- B01D53/9418—Processes characterised by a specific catalyst for removing nitrogen oxides by selective catalytic reduction [SCR] using a reducing agent in a lean exhaust gas
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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
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/002—Mixed oxides other than spinels, e.g. perovskite
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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
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/24—Chromium, molybdenum or tungsten
- B01J23/30—Tungsten
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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
- B01D2258/01—Engine exhaust gases
- B01D2258/012—Diesel engines and lean burn gasoline engines
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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
- B01J2523/00—Constitutive chemical elements of heterogeneous catalysts
Abstract
The invention discloses a diesel engine tail gas treatment process, which belongs to the technical field of tail gas treatment and comprises particle purification, molecular conversion, SCR denitration and aftertreatment; the molecular conversion is to add a molecular conversion agent into the tail gas dust and convert the tail gas dust into large particles without viscosity; in the SCR denitration, ammonia gas and diesel engine tail gas are mixed at the inlet of a reactor and then are introduced into the reactor filled with a denitration catalyst for catalytic reaction, and the reduction reaction is carried out under the action of the denitration catalyst to obtain the denitrated diesel engine tail gas; the diesel engine tail gas treatment process can improve the SCR denitration efficiency, and can better remove carbon black particles in the tail gas, thereby avoiding blocking of the filter material.
Description
Technical Field
The invention relates to the technical field of tail gas treatment, in particular to a diesel engine tail gas treatment process.
Background
The main pollutants of the tail gas of the high-power diesel engine are carbon black particles PM and NOx and incompletely combustedDiesel oil, lubricating oil, and the like have viscous combustible materials, thereby increasing the difficulty of removing the soot particles PM and NOx in the exhaust gas. At present, the tail gas treatment of the heavy-duty diesel engine adopts a common SCR denitration system and a DPF ceramic filter body to remove NOx and carbon black particle PM, and the content of NOx in the tail gas of the diesel engine reaches 1300-1600mg/m3And the removal rate of the common SCR denitration system is only 80%, and the standard emission is difficult to achieve. Carbon black particles in the tail gas are removed by adopting a DPF ceramic filter body, and due to the characteristics of the ceramic filter body, the filter body can be blocked in a short time, so that positive pressure emission of a diesel engine is caused, and the diesel engine can not run for a long time and the power performance of the engine is influenced. Therefore, research and development diesel vehicle tail gas treatment technology can improve SCR denitration efficiency, and carbon black particles in the tail gas are better removed, so that the blockage of the filtering material is avoided, and the problem which needs to be solved at present is solved urgently.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a diesel engine tail gas treatment process which can improve the SCR denitration efficiency, better remove carbon black particles in tail gas and avoid blocking a filter material.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a process for treating the tail gas of diesel engine includes such steps as purifying particles, molecular conversion, SCR denitration and post-treatment.
The method comprises the following steps of particle purification, namely introducing diesel engine tail gas into a particle purifier, removing large particles in the diesel engine tail gas in a pre-separation chamber in the particle purifier to obtain the diesel engine tail gas after particle removal, introducing the diesel engine tail gas after particle removal into a filter, and removing dust through a filter material in the filter to obtain the diesel engine tail gas and tail gas dust after dust removal;
the filter material in the filter is a composite base filter material, and the composite base filter material consists of laminated metal fiber felts Fe-18Cr-3Ai and alumina fiber felts 70Ai2O3-30SiO2；
Wherein the mass ratio of the laminated metal fiber felt to the alumina fiber felt is 1: 10-12;
the molecular conversion is to add a molecular conversion agent into the tail gas dust and convert the tail gas dust into large particles without viscosity;
the molecular conversion agent comprises the following components in parts by weight: 25-30 parts of calcium hydroxide, 3-4 parts of magnesium hydroxide, 1-2 parts of sodium carbonate and 0.3-0.5 part of lauryl sodium sulfate;
the weight ratio of the tail gas dust to the molecular conversion agent is 3-4: 1.
Mixing ammonia gas and diesel engine tail gas at the inlet of the reactor, introducing the mixture into a reactor filter screen filled with a denitration catalyst, controlling the temperature of the reactor at 200-220 ℃, and controlling the flow speed of the diesel engine tail gas after dust removal at 1-1.2m3A/s, carrying out a reduction reaction under the action of a denitration catalyst to obtain the denitrated diesel engine tail gas;
the capacity of the denitration catalyst in the reactor on the filter screen of the reactor is 600-2；
The volume ratio of the ammonia gas to the diesel engine tail gas after dust removal is 1: 1-1.2;
the preparation method of the denitration catalyst comprises the following steps: placing titanium dioxide, vanadium pentoxide and tungsten trioxide in a ball mill according to a weight ratio of 10-13:25-28:3-4 for ball milling, controlling the ball-material ratio during ball milling to be 4-6:1, the rotating speed to be 350-, the treatment time is 6-8min, and the denitration catalyst is obtained;
the preparation method of the organic intercalation agent comprises the following steps: uniformly mixing trimethyl octadecyl ammonium bromide, citric acid, phytic acid, hexadecyl trimethyl ammonium bromide and nano boron nitride, then carrying out low-temperature treatment, controlling the temperature of the low-temperature treatment to be-10 ℃ to-5 ℃, controlling the time of the low-temperature treatment to be 30-35min, heating to 40-45 ℃ at the heating rate of 1-1.2 ℃/min after the low-temperature treatment is finished, standing at the temperature of 40-45 ℃ for 20-25min, and naturally recovering to the room temperature to obtain an organic intercalation agent;
the particle size of the nano boron nitride is 80-100 nm;
in the preparation of the organic intercalator, the weight ratio of trimethyl octadecyl ammonium bromide, citric acid, phytic acid, hexadecyl trimethyl ammonium bromide and nano boron nitride is 18-20:3-6:1-2:4-6: 2-4.
And in the post-treatment, introducing the denitrated diesel engine tail gas into post-treatment equipment, and controlling the flow velocity of the denitrated diesel engine tail gas to be 1-1.2m3S, absorbing by an absorbent in post-treatment equipment to obtain treated tail gas;
the post-treatment agent comprises the following components in parts by weight: 100 portions of porous calcium carbonate, 50 to 55 portions of zeolite powder, 35 to 40 portions of volcanic rock powder, 6 to 8 portions of sodium persulfate and 3 to 5 portions of nano alumina;
the particle size of the nano alumina is 200-300 nm.
Compared with the prior art, the invention has the beneficial effects that:
(1) the diesel engine tail gas treatment process can improve SCR denitration efficiency, and the treated tail gas contains 20-30mg of dust, 5-10ppm of NO and NO2The content of N is 10-20ppm2O content of 10-15ppm, N2O312-15ppm of NH, 10-15ppm of SO and 30-35ppm of SO2The content is 8-12 ppm;
(2) the diesel engine tail gas treatment process can convert dust in the diesel engine tail gas into large particles without viscosity, so that the large particles can be recycled;
(3) the diesel engine tail gas treatment process can better remove carbon black particles in the tail gas and avoid blockage of the filter material.
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present invention, specific embodiments of the present invention will now be described.
Example 1
A process for treating the tail gas of diesel engine includes particle cleaning, molecular conversion, SCR denitration and post-treatment.
The method comprises the following steps of particle purification, namely introducing diesel engine tail gas into a particle purifier, removing large particles in the diesel engine tail gas in a pre-separation chamber in the particle purifier to obtain the diesel engine tail gas after particle removal, introducing the diesel engine tail gas after particle removal into a filter, and removing dust through a filter material in the filter to obtain the diesel engine tail gas and tail gas dust after dust removal;
the diesel engine tail gas has dust content of 320mg, NO content of 950ppm and NO2The content of N was 1200ppm2O content 380ppm, N2O3200ppm of NH, 1030ppm of SO, 430ppm of SO2The content was 310 ppm;
the filter material in the filter is a composite base filter material, and the composite base filter material consists of laminated metal fiber felts Fe-18Cr-3Ai and alumina fiber felts 70Ai2O3-30SiO2；
Wherein the mass ratio of the laminated metal fiber felt to the alumina fiber felt is 1: 10;
the molecular conversion is to add a molecular conversion agent into the tail gas dust and convert the tail gas dust into large particles without viscosity;
the molecular conversion agent comprises the following components in parts by weight: 25 parts of calcium hydroxide, 3 parts of magnesium hydroxide, 1 part of sodium carbonate and 0.3 part of sodium dodecyl sulfate;
the weight ratio of the tail gas dust to the molecular conversion agent is 3: 1.
Mixing ammonia gas and diesel engine tail gas subjected to dust removal at the inlet of a reactor, introducing the mixture into a reactor filter screen filled with a denitration catalyst, controlling the temperature of the reactor to be 200 ℃, and controlling the flow velocity of the diesel engine tail gas subjected to dust removal to be 1m3Performing a reduction reaction under the action of a denitration catalyst to obtain the diesel engine tail gas after denitration;
the loading capacity of the denitration catalyst in the reactor on the filter screen of the reactor is 600 mu g/cm2；
The volume ratio of the ammonia gas to the diesel engine tail gas after dust removal is 1: 1;
the preparation method of the denitration catalyst comprises the following steps: placing titanium dioxide, vanadium pentoxide and tungsten trioxide in a ball mill according to the weight ratio of 10:25:3 for ball milling, controlling the ball-to-material ratio during ball milling to be 4:1, the rotating speed to be 350rpm, the ball milling time to be 30min, obtaining a catalyst mixture after ball milling is finished, mixing the catalyst mixture, an organic intercalation agent and deionized water according to the weight ratio of 15:3:28, stirring at 60 ℃, controlling the stirring speed to be 200rpm, obtaining a primary catalyst liquid after stirring for 1h, filtering the primary catalyst liquid, performing high-temperature plasma treatment on filter residues, controlling the treatment temperature in the high-temperature plasma treatment process to be 150 ℃, the treatment power to be 280W, and the treatment time to be 6min to obtain a denitration catalyst;
the preparation method of the organic intercalation agent comprises the following steps: uniformly mixing trimethyl octadecyl ammonium bromide, citric acid, phytic acid, hexadecyl trimethyl ammonium bromide and nano boron nitride, then carrying out low-temperature treatment, controlling the temperature of the low-temperature treatment to be-10 ℃, the time of the low-temperature treatment to be 30min, raising the temperature to 40 ℃ at the temperature rise speed of 1 ℃/min after the low-temperature treatment is finished, standing at 40 ℃ for 20min, and naturally recovering to the room temperature to obtain an organic intercalator;
the particle size of the nano boron nitride is 80 nm;
in the preparation of the organic intercalation agent, the weight ratio of trimethyl octadecyl ammonium bromide, citric acid, phytic acid, hexadecyl trimethyl ammonium bromide and nano boron nitride is 18:3:1:4: 2.
And (3) after-treatment, introducing the denitrated diesel engine tail gas into after-treatment equipment, and controlling the flow velocity of the denitrated diesel engine tail gas to be 1m3The gas is absorbed by an absorbent in post-treatment equipment to obtain treated tail gas;
the post-treatment agent comprises the following components in parts by weight: 100 parts of porous calcium carbonate, 50 parts of zeolite powder, 35 parts of volcanic rock powder, 6 parts of sodium persulfate and 3 parts of nano alumina;
the particle size of the nano alumina is 200 nm.
The dust content in the treated tail gas is 20mg,NO content 5ppm, NO2Content of 10ppm, N2O content 10ppm, N2O312ppm of NH, 30ppm of SO, 10ppm of SO2The content was 8 ppm.
Example 2
A process for treating the tail gas of diesel engine includes particle cleaning, molecular conversion, SCR denitration and post-treatment.
The method comprises the following steps of (1) performing particle purification, namely introducing diesel engine tail gas into a particle purifier, removing large particles in the diesel engine tail gas in a pre-separation chamber in the particle purifier to obtain the diesel engine tail gas after the particles are removed, introducing the diesel engine tail gas after the particles are removed into a filter, and removing dust through a filter material in the filter to obtain the diesel engine tail gas and tail gas dust after the dust is removed;
the dust content in the diesel engine tail gas is 335mg, the NO content is 980ppm, and NO is2Content 1250ppm, N2O content 400ppm, N2O3210ppm of NH 1040ppm of SO 440ppm of SO2The content was 320 ppm;
the filter material in the filter is a composite base filter material which comprises laminated metal fiber felts Fe-18Cr-3Ai and alumina fiber felts 70Ai2O3-30SiO2；
Wherein the mass ratio of the laminated metal fiber felt to the alumina fiber felt is 1: 11;
the molecular conversion is to add a molecular conversion agent into the tail gas dust and convert the tail gas dust into large particles without viscosity;
the molecular conversion agent comprises the following components in parts by weight: 27 parts of calcium hydroxide, 3.5 parts of magnesium hydroxide, 1.5 parts of sodium carbonate and 0.4 part of sodium dodecyl sulfate;
the weight ratio of the tail gas dust to the molecular conversion agent is 3.5: 1.
In the SCR denitration, ammonia gas and diesel engine tail gas after dust removal are mixed at the inlet of a reactor and then introduced into a reactor filter screen filled with a denitration catalyst, the temperature of the reactor is controlled to be 210 ℃, and the flow velocity of the diesel engine tail gas after dust removal is 1.1m3A/s, carrying out a reduction reaction under the action of a denitration catalyst to obtain the denitrated diesel engine tail gas;
the loading capacity of the denitration catalyst in the reactor on the filter screen of the reactor is 650 mu g/cm2；
The volume ratio of the ammonia gas to the diesel engine tail gas after dust removal is 1: 1.1;
the preparation method of the denitration catalyst comprises the following steps: placing titanium dioxide, vanadium pentoxide and tungsten trioxide in a ball mill according to a weight ratio of 11:26:3.5 for ball milling, controlling a ball-to-material ratio during ball milling to be 4-6:1, a rotating speed to be 370rpm, ball milling time to be 35min, obtaining a catalyst mixture after ball milling is finished, mixing the catalyst mixture, an organic intercalation agent and deionized water according to a weight ratio of 16:3.5:29, stirring at 62 ℃, controlling a stirring speed to be 220rpm, stirring for 1.2h to obtain a primary catalyst liquid, filtering the primary catalyst liquid, performing high-temperature plasma treatment on filter residues, controlling a treatment temperature in the high-temperature plasma treatment process to be 155 ℃, a treatment power to be 290W, and the treatment time to be 7min to obtain a denitration catalyst;
the preparation method of the organic intercalation agent comprises the following steps: uniformly mixing trimethyl octadecyl ammonium bromide, citric acid, phytic acid, hexadecyl trimethyl ammonium bromide and nano boron nitride, then carrying out low-temperature treatment, controlling the temperature of the low-temperature treatment to be-7 ℃, the time of the low-temperature treatment to be 32min, raising the temperature to 42 ℃ at the heating rate of 1.1 ℃/min after the low-temperature treatment is finished, standing at 42 ℃ for 22min, and naturally recovering to the room temperature to obtain an organic intercalator;
the particle size of the nano boron nitride is 90 nm;
in the preparation of the organic intercalator, the weight ratio of trimethyl octadecyl ammonium bromide, citric acid, phytic acid, hexadecyl trimethyl ammonium bromide and nano boron nitride is 19:4:1.5:5: 3.
And (3) after-treatment, introducing the denitrated diesel engine tail gas into after-treatment equipment, and controlling the flow velocity of the denitrated diesel engine tail gas to be 1.1m3The gas is absorbed by an absorbent in post-treatment equipment to obtain treated tail gas;
the post-treatment agent comprises the following components in parts by weight: 105 parts of porous calcium carbonate, 52 parts of zeolite powder, 37 parts of volcanic rock powder, 7 parts of sodium persulfate and 4 parts of nano-alumina;
the particle size of the nano alumina is 250 nm.
The dust content in the treated tail gas is 25mg, the NO content is 7ppm, and NO is2Content 15ppm, N2O content 12ppm, N2O3The content was 14ppm, the NH content was 32ppm, the SO content was 12ppm, SO2The content was 9 ppm.
Example 3
A process for treating the tail gas of diesel engine includes particle cleaning, molecular conversion, SCR denitration and post-treatment.
The method comprises the following steps of particle purification, namely introducing diesel engine tail gas into a particle purifier, removing large particles in the diesel engine tail gas in a pre-separation chamber in the particle purifier to obtain the diesel engine tail gas after particle removal, introducing the diesel engine tail gas after particle removal into a filter, and removing dust through a filter material in the filter to obtain the diesel engine tail gas and tail gas dust after dust removal;
the dust content in the tail gas of the diesel engine is 340mg, the NO content is 990ppm, and NO is2The content of N is 1280ppm2O content 410ppm, N2O3230ppm, NH 1060ppm, SO 460ppm, SO2The content was 340 ppm;
the filter material in the filter is a composite base filter material, and the composite base filter material consists of laminated metal fiber felts Fe-18Cr-3Ai and alumina fiber felts 70Ai2O3-30SiO2；
Wherein the mass ratio of the laminated metal fiber felt to the alumina fiber felt is 1: 12;
the molecular conversion is to add a molecular conversion agent into the tail gas dust and convert the tail gas dust into large particles without viscosity;
the molecular conversion agent comprises the following components in parts by weight: 30 parts of calcium hydroxide, 4 parts of magnesium hydroxide, 2 parts of sodium carbonate and 0.5 part of lauryl sodium sulfate;
the weight ratio of the tail gas dust to the molecular conversion agent is 4:1.
In the SCR denitration, ammonia gas and diesel engine tail gas after dust removal are mixed at the inlet of a reactor and then introduced into a reactor filter screen filled with a denitration catalyst, the temperature of the reactor is controlled to be 220 ℃, and the flow velocity of the diesel engine tail gas after dust removal is 1.2m3A/s, carrying out a reduction reaction under the action of a denitration catalyst to obtain the denitrated diesel engine tail gas;
the loading capacity of the denitration catalyst in the reactor on the filter screen of the reactor is 700 mu g/cm2；
The volume ratio of the ammonia gas to the diesel engine tail gas after dust removal is 1: 1.2;
the preparation method of the denitration catalyst comprises the following steps: placing titanium dioxide, vanadium pentoxide and tungsten trioxide in a ball mill according to a weight ratio of 13:28:4 for ball milling, controlling a ball-to-material ratio during ball milling to be 6:1, a rotating speed to be 400rpm, ball milling time to be 40min, obtaining a catalyst mixture after ball milling is finished, mixing the catalyst mixture, an organic intercalation agent and deionized water according to a weight ratio of 17:4:30, stirring at 65 ℃, controlling a stirring speed to be 250rpm, stirring for 1.5h to obtain a primary catalyst liquid, filtering the primary catalyst liquid, performing high-temperature plasma treatment on filter residues, controlling a treatment temperature in the high-temperature plasma treatment process to be 160 ℃, a treatment power to be 300W, and treating time to be 8min to obtain a denitration catalyst;
the preparation method of the organic intercalation agent comprises the following steps: uniformly mixing trimethyl octadecyl ammonium bromide, citric acid, phytic acid, hexadecyl trimethyl ammonium bromide and nano boron nitride, then carrying out low-temperature treatment, controlling the temperature of the low-temperature treatment to be-5 ℃, the time of the low-temperature treatment to be 35min, heating to 45 ℃ at the heating rate of 1.2 ℃/min after the low-temperature treatment is finished, standing at 45 ℃ for 25min, and naturally recovering to the room temperature to obtain an organic intercalator;
the particle size of the nano boron nitride is 100 nm;
in the preparation of the organic intercalation agent, the weight ratio of trimethyl octadecyl ammonium bromide, citric acid, phytic acid, hexadecyl trimethyl ammonium bromide and nano boron nitride is 20:6:2:6: 4.
The back partThe diesel engine tail gas after denitration is introduced into the aftertreatment equipment, and the flow velocity of the diesel engine tail gas after denitration is controlled to be 1.2m3S, absorbing by an absorbent in post-treatment equipment to obtain treated tail gas;
the post-treatment agent comprises the following components in parts by weight: 110 parts of porous calcium carbonate, 55 parts of zeolite powder, 40 parts of volcanic rock powder, 8 parts of sodium persulfate and 5 parts of nano-alumina;
the grain diameter of the nano alumina is 300 nm.
The dust content in the treated tail gas is 30mg, the NO content is 10ppm, and NO is2Content of 20ppm, N2O content 15ppm, N2O315ppm of NH, 35ppm of SO, 15ppm of SO2The content was 12 ppm.
All percentages used in the present invention are mass percentages unless otherwise indicated.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described above, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A diesel engine tail gas treatment process is characterized by comprising particle purification, molecular conversion, SCR denitration and post-treatment;
the molecular conversion is to add a molecular conversion agent into the tail gas dust and convert the tail gas dust into large particles without viscosity;
the molecular conversion agent comprises the following components in parts by weight: 25-30 parts of calcium hydroxide, 3-4 parts of magnesium hydroxide, 1-2 parts of sodium carbonate and 0.3-0.5 part of lauryl sodium sulfate;
the weight ratio of the tail gas dust to the molecular conversion agent is 3-4: 1;
the SCRDenitration, mixing ammonia gas and diesel engine tail gas after dust removal at the inlet of a reactor, introducing the mixture into a reactor filter screen filled with a denitration catalyst, controlling the temperature of the reactor to be 200-220 ℃, and controlling the flow velocity of the diesel engine tail gas after dust removal to be 1-1.2m3A/s, carrying out a reduction reaction under the action of a denitration catalyst to obtain the denitrated diesel engine tail gas;
the capacity of the denitration catalyst in the reactor on the filter screen of the reactor is 600-700 mu g/cm-2；
The volume ratio of the ammonia gas to the diesel engine tail gas after dust removal is 1: 1-1.2.
2. The diesel exhaust gas treatment process according to claim 1, wherein in the particulate purification step, the diesel exhaust gas is introduced into a particulate purifier, large particles in the diesel exhaust gas are removed in a pre-separation chamber in the particulate purifier to obtain diesel exhaust gas from which particles are removed, the diesel exhaust gas from which particles are removed is introduced into a filter, and the diesel exhaust gas from which dust is removed and the exhaust dust are removed by a filter material in the filter to obtain diesel exhaust gas from which dust is removed;
the filter material in the filter is a composite base filter material, and the composite base filter material consists of laminated metal fiber felts Fe-18Cr-3Ai and alumina fiber felts 70Ai2O3-30SiO2；
Wherein the mass ratio of the laminated metal fiber felt to the alumina fiber felt is 1: 10-12.
3. The diesel engine exhaust gas treatment process according to claim 1, wherein the preparation method of the denitration catalyst comprises the following steps: placing titanium dioxide, vanadium pentoxide and tungsten trioxide in a ball mill according to a weight ratio of 10-13:25-28:3-4 for ball milling, controlling the ball-material ratio during ball milling to be 4-6:1, the rotating speed to be 350-, the treatment time is 6-8min, and the denitration catalyst is obtained.
4. The diesel engine tail gas treatment process according to claim 3, wherein the preparation method of the organic intercalation agent is as follows: uniformly mixing trimethyl octadecyl ammonium bromide, citric acid, phytic acid, hexadecyl trimethyl ammonium bromide and nano boron nitride, then carrying out low-temperature treatment, controlling the temperature of the low-temperature treatment to be-10 ℃ to-5 ℃, controlling the time of the low-temperature treatment to be 30-35min, heating to 40-45 ℃ at the heating rate of 1-1.2 ℃/min after the low-temperature treatment is finished, standing at 40-45 ℃ for 20-25min, and then naturally recovering to the room temperature to obtain the organic intercalator.
5. The treatment process for the tail gas of the diesel engine according to claim 4, wherein the particle size of the nano boron nitride is 80-100 nm.
6. The diesel engine tail gas treatment process according to claim 4, wherein in the preparation of the organic intercalator, the weight ratio of trimethyl octadecyl ammonium bromide, citric acid, phytic acid, hexadecyl trimethyl ammonium bromide and nano boron nitride is 18-20:3-6:1-2:4-6: 2-4.
7. The treatment process for the exhaust gas of the diesel engine according to claim 1, wherein the post-treatment comprises introducing the denitrated exhaust gas of the diesel engine into post-treatment equipment, and controlling the flow velocity of the denitrated exhaust gas of the diesel engine to be 1-1.2m3And/s, absorbing by an absorbent in the post-treatment equipment to obtain the treated tail gas.
8. The diesel engine tail gas treatment process according to claim 7, wherein the aftertreatment agent comprises the following components in parts by weight: 100-110 parts of porous calcium carbonate, 50-55 parts of zeolite powder, 35-40 parts of volcanic rock powder, 6-8 parts of sodium persulfate and 3-5 parts of nano alumina.
9. The diesel engine exhaust treatment process according to claim 8, wherein the particle size of the nano alumina is 200-300 nm.
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| CN202210444420.3A CN114768411A (en) | 2022-04-26 | 2022-04-26 | Diesel engine tail gas treatment process |
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| CN202210444420.3A CN114768411A (en) | 2022-04-26 | 2022-04-26 | Diesel engine tail gas treatment process |
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