CN110841725A - Microwave regeneration treatment method of carbon-based catalyst for simultaneous desulfurization and denitrification - Google Patents
Microwave regeneration treatment method of carbon-based catalyst for simultaneous desulfurization and denitrification Download PDFInfo
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- CN110841725A CN110841725A CN201911066493.8A CN201911066493A CN110841725A CN 110841725 A CN110841725 A CN 110841725A CN 201911066493 A CN201911066493 A CN 201911066493A CN 110841725 A CN110841725 A CN 110841725A
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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
- B01J38/00—Regeneration or reactivation of catalysts, in general
- B01J38/02—Heat treatment
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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
- B01D53/8637—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
Abstract
The invention relates to a microwave regeneration treatment method of a carbon-based catalyst for simultaneous desulfurization and denitrification, which utilizes the characteristic of easy wave absorption of the carbon-based catalyst and can be heated to a higher temperature by microwave in a short time so that the absorbed energy can quickly reach the volatilization or decomposition temperature. The microwave heating process makes the pollutant adsorbed in the pores of the carbon-base catalyst decompose and volatilize rapidly to produce great vapor pressure, and the pollutant is extruded through explosion to form porous structure, so as to complete the regeneration process. The regeneration method of the carbon-based catalyst provided by the invention has the advantages of simple process, short regeneration time, strong operability, good recovery of the desulfurization and denitrification performance of the carbon-based catalyst, low energy consumption and the like, and can realize the recovery of the sulfur resource after desorption by adding the light-burned magnesium oxide.
Description
Technical Field
The invention relates to a microwave regeneration treatment method, in particular to a microwave regeneration treatment method of a carbon-based catalyst for desulfurization and denitrification, which has the advantages of simple process, short regeneration time and strong operability.
Background
The carbon-based catalyst dry-method flue gas multi-pollutant integrated removal technology meets policy requirements of energy conservation and emission reduction, improvement of environmental protection efficiency, enhancement of resource recycling and the like, and has the advantages of combined removal of multi-pollutants, emission reduction, water conservation, resource recycling and low operation cost and the like. Among the numerous carbon-based catalyst regeneration methods, the thermal regeneration process is the most mature, but has many disadvantages, such as high raw material loss rate, long regeneration time, complex regeneration equipment, high energy consumption, low product quality and the like.
The microwave heating technology is used for chemical reactions starting in the early 80 s, develops rapidly in chemistry and related fields, is widely applied to aspects such as organic synthesis, inorganic chemical reactions, material preparation, sample preparation analysis, activated carbon preparation and the like at present, but is brand new as a regeneration technology of carbon-based catalysts.
ZL00113039.0 discloses a method for regenerating volatile nonpolar organic matter-loaded active carbon by microwaves, and provides a plurality of factors influencing the regeneration of the active carbon, the regeneration process of adsorbate can be completed by controlling process conditions, but the properties and treatment and recycling of outlet gas are not explicitly described. CN1792450A discloses a regeneration method of a carbon-based catalyst for simultaneous desulfurization and denitrification, which comprises the steps of mixing the carbon-based catalyst with calcium oxide preheated to 700-1000 ℃ to ensure that the temperature of the mixed material reaches 300-500 ℃, and the calcium oxide and SO desorbed from the catalyst2The reaction is completed to regenerate the carbon-based material. The method has the advantages that the energy consumption of the pre-oxidized calcium oxide is high, the regeneration process lasts for 30-120 min, and the consumed time is long.
Disclosure of Invention
In view of the above problems, the main object of the present invention is to provide a microwave regeneration treatment method of a carbon-based catalyst for desulfurization and denitrification, which has a simple process, a short regeneration time, and a high operability.
The invention solves the technical problems through the following technical scheme: a microwave regeneration treatment method of a carbon-based catalyst for simultaneous desulfurization and denitrification comprises the following steps:
step (1): uniformly mixing the carbon-based catalyst subjected to desulfurization and denitrification with industrial-grade light-burned magnesium oxide;
step (2): placing the mixture of carbon-based catalyst and light-burned magnesium oxide in a microwave regenerator in an oxygen isolation state;
and (3): starting microwave heating equipment of a microwave regenerator, and heating the mixture by adopting microwave radiation;
and (4): after the temperature rise is finished, closing the microwave equipment, and screening the carbon-based catalyst, the magnesium oxide and the anhydrous magnesium sulfate after the materials are cooled;
and (5): and (5) recovering impurities.
In a specific embodiment of the present invention; the content of the industrial light-burned magnesia MgO adopted by the industrial light-burned magnesia in the step (1) is more than or equal to 80 percent.
In a specific embodiment of the present invention; in the step (1), the weight ratio of the light-burned magnesium oxide to the carbon-based catalyst is 1-3: 1.
in a specific embodiment of the present invention; the microwave regenerator in the step (2) is a microwave regenerator processed by quartz glass.
In a specific embodiment of the present invention; the ratio of the microwave radiation power to the mass of the mixture in the step (3) is 20-80W/g.
In a specific embodiment of the present invention; in the step (3), the temperature of the mixture of the carbon-based catalyst and the magnesium oxide is raised to 500-800 ℃, and the regeneration duration is 5-20 min.
In a specific embodiment of the present invention; heating the mixed material in the step (3) to raise the temperature, and adsorbing sulfur by the carbon-based catalyst with SO2Form desorption, and then reaction with magnesium oxide to be trapped; the chemical reactions that take place during regeneration are:
2H2SO4+C＝SO2+CO2+2H2O
SO2+MgO＝MgSO3
2MgSO3+O2＝2MgSO4
in a specific embodiment of the present invention; the temperature for cooling the materials in the step (4) is 0-40 ℃.
The positive progress effects of the invention are as follows: the microwave regeneration treatment method of the carbon-based catalyst for simultaneous desulfurization and denitrification provided by the invention has the following advantages: the invention utilizes the characteristic of easy wave absorption of the carbon-based catalyst, can be heated to a higher temperature by microwave in a short time, and enables the adsorption energy to quickly reach the volatilization or decomposition temperature. The microwave heating process makes the pollutant adsorbed in the pores of the carbon-base catalyst decompose and volatilize rapidly to produce great vapor pressure, and the pollutant is extruded through explosion to form porous structure, so as to complete the regeneration process. The regeneration method of the carbon-based catalyst provided by the invention has the advantages of simple process, short regeneration time, strong operability, good recovery of the desulfurization and denitrification performance of the carbon-based catalyst, low energy consumption and the like, and can realize the recovery of the sulfur resource after desorption by adding the light-burned magnesium oxide.
Detailed Description
The following provides a preferred embodiment of the present invention with reference to data to explain the technical solutions of the present invention in detail.
The invention provides a microwave regeneration treatment method of a carbon-based catalyst for simultaneous desulfurization and denitrification, which comprises the following steps:
step (1): uniformly mixing the carbon-based catalyst subjected to desulfurization and denitrification with industrial-grade light-burned magnesium oxide;
the content of the industrial light-burned magnesia MgO adopted by the industrial light-burned magnesia in the step (1) is more than or equal to 80 percent. In the step (1), the weight ratio of the light-burned magnesium oxide to the carbon-based catalyst is 1-3: 1.
step (2): placing the mixture of carbon-based catalyst and light-burned magnesium oxide in a microwave regenerator in an oxygen isolation state; the microwave regenerator in the step (2) is a microwave regenerator processed by quartz glass.
And (3): starting microwave heating equipment of a microwave regenerator, and heating the mixture by adopting microwave radiation; the ratio of the microwave radiation power to the mass of the mixture in the step (3) is 20-80W/g. In the step (3), the temperature of the mixture of the carbon-based catalyst and the magnesium oxide is raised to 500-800 ℃, and the regeneration duration is 5-20 min.
Heating the mixed material in the step (3) to raise the temperature, and adsorbing sulfur by the carbon-based catalyst with SO2Form desorption, and then reaction with magnesium oxide to be trapped; the chemical reactions that take place during regeneration are:
2H2SO4+C＝SO2+CO2+2H2O
SO2+MgO＝MgSO3
2MgSO3+O2＝2MgSO4
and (4): after the temperature rise is finished, closing the microwave equipment, and screening the carbon-based catalyst, the magnesium oxide and the anhydrous magnesium sulfate after the materials are cooled; the temperature for cooling the materials in the step (4) is 0-40 ℃.
And (5): and (5) recovering impurities.
The following are specific examples of implementation:
example 1
A microwave regeneration treatment method of a carbon-based catalyst for simultaneous desulfurization and denitrification comprises the following steps:
(1) uniformly mixing the carbon-based catalyst subjected to desulfurization and denitrification with industrial light-burned magnesia, wherein the weight ratio of the light-burned magnesia to the carbon-based catalyst is 3: 1;
(2) placing a mixture of carbon-based catalyst and light-burned magnesium oxide in a microwave regenerator in an oxygen isolation state, wherein the microwave regenerator is formed by processing quartz glass;
(3) starting microwave heating equipment, heating the mixture by adopting microwave radiation, controlling the ratio of the microwave radiation power to the mass of the mixture to be 80W/g, heating the mixed material to 800 ℃, and regenerating for 20 min;
(4) and after the regeneration is finished, closing the microwave equipment, and after the materials are cooled, screening the carbon-based catalyst, the magnesium oxide and the anhydrous magnesium sulfate by using a sieve of 80 meshes.
The regenerated carbon-based catalyst is circularly used for the multi-pollutant integrated removal process under the reaction conditions, and the sulfur capacity is 5.9g SO when the desulfurization efficiency is higher than 80 percent2100g, the denitration efficiency is 70%.
Example 2
A microwave regeneration treatment method of a carbon-based catalyst for simultaneous desulfurization and denitrification comprises the following steps:
(1) uniformly mixing the carbon-based catalyst subjected to desulfurization and denitrification with industrial light-burned magnesia, wherein the weight ratio of the light-burned magnesia to the carbon-based catalyst is 1: 1;
(2) placing a mixture of carbon-based catalyst and light-burned magnesium oxide in a microwave regenerator in an oxygen isolation state, wherein the microwave regenerator is formed by processing quartz glass;
(3) starting microwave heating equipment, heating the mixture by adopting microwave radiation, controlling the ratio of the microwave radiation power to the mixture quality to be 20W/g, heating the mixture to 500 ℃, and regenerating for 30 min;
(4) and after the regeneration is finished, closing the microwave equipment, and after the materials are cooled, screening the carbon-based catalyst, the magnesium oxide and the anhydrous magnesium sulfate by using a 90-mesh sieve.
The regenerated carbon-based catalyst is circularly used for the multi-pollutant integrated removal process under the reaction conditions, and the sulfur capacity is 3.0g SO when the desulfurization efficiency is higher than 80 percent2100g, denitration efficiency is 51%.
Example 3
A microwave regeneration treatment method of a carbon-based catalyst for simultaneous desulfurization and denitrification comprises the following steps:
(1) uniformly mixing the carbon-based catalyst subjected to desulfurization and denitrification with industrial light-burned magnesia, wherein the weight ratio of the light-burned magnesia to the carbon-based catalyst is 2: 1;
(2) placing a mixture of carbon-based catalyst and light-burned magnesium oxide in a microwave regenerator in an oxygen isolation state, wherein the microwave regenerator is formed by processing quartz glass;
(3) starting microwave heating equipment, heating the mixture by adopting microwave radiation, controlling the ratio of the microwave radiation power to the mass of the mixture to be 60W/g, heating the mixed material to 700 ℃, and regenerating for 15 min;
(4) and after the regeneration is finished, closing the microwave equipment, and after the materials are cooled, screening the carbon-based catalyst, the magnesium oxide and the anhydrous magnesium sulfate by using a sieve of 80 meshes.
The regenerated carbon-based catalyst is circularly used for the multi-pollutant integrated removal process under the reaction conditions, and the sulfur capacity is 5.5g SO when the desulfurization efficiency is higher than 80 percent2100g, the denitration efficiency is 65%.
Example 4
A microwave regeneration treatment method of a carbon-based catalyst for simultaneous desulfurization and denitrification comprises the following steps:
(1) uniformly mixing the carbon-based catalyst subjected to desulfurization and denitrification with industrial light-burned magnesia, wherein the weight ratio of the light-burned magnesia to the carbon-based catalyst is 3: 1;
(2) placing a mixture of carbon-based catalyst and light-burned magnesium oxide in a microwave regenerator in an oxygen isolation state, wherein the microwave regenerator is formed by processing quartz glass;
(3) starting microwave heating equipment, heating the mixture by adopting microwave radiation, controlling the ratio of the microwave radiation power to the mass of the mixture to be 50W/g, heating the mixed material to 650 ℃, and regenerating for 30 min;
(4) and after the regeneration is finished, closing the microwave equipment, and after the materials are cooled, screening the carbon-based catalyst, the magnesium oxide and the anhydrous magnesium sulfate by using a sieve of 80 meshes.
The regenerated carbon-based catalyst is circularly used for the multi-pollutant integrated removal process under the reaction conditions, and the sulfur capacity is 5.1g SO when the desulfurization efficiency is higher than 80 percent2100g, denitration efficiency is 56%.
Example 5
A microwave regeneration treatment method of a carbon-based catalyst for simultaneous desulfurization and denitrification comprises the following steps:
(1) uniformly mixing the carbon-based catalyst subjected to desulfurization and denitrification with industrial light-burned magnesia, wherein the weight ratio of the light-burned magnesia to the carbon-based catalyst is 2: 1;
(2) placing a mixture of carbon-based catalyst and light-burned magnesium oxide in a microwave regenerator in an oxygen isolation state, wherein the microwave regenerator is formed by processing quartz glass;
(3) starting microwave heating equipment, heating the mixture by adopting microwave radiation, controlling the ratio of the microwave radiation power to the mass of the mixture to be 40W/g, heating the mixed material to 600 ℃, and regenerating for 15 min;
(4) and after the regeneration is finished, closing the microwave equipment, and after the materials are cooled, screening the carbon-based catalyst, the magnesium oxide and the anhydrous magnesium sulfate by using a 90-mesh sieve.
The regenerated carbon-based catalyst is circularly used for the multi-pollutant integrated removal process under the reaction conditions, and the sulfur capacity is 5.0g SO when the desulfurization efficiency is higher than 80 percent2100g, denitration efficiency is 51%.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined by the appended claims and their equivalents.
Claims (8)
1. A microwave regeneration treatment method of a carbon-based catalyst for simultaneous desulfurization and denitrification is characterized by comprising the following steps: the method comprises the following steps:
step (1): uniformly mixing the carbon-based catalyst subjected to desulfurization and denitrification with industrial-grade light-burned magnesium oxide;
step (2): placing the mixture of carbon-based catalyst and light-burned magnesium oxide in a microwave regenerator in an oxygen isolation state;
and (3): starting microwave heating equipment of a microwave regenerator, and heating the mixture by adopting microwave radiation;
and (4): after the temperature rise is finished, closing the microwave equipment, and screening the carbon-based catalyst, the magnesium oxide and the anhydrous magnesium sulfate after the materials are cooled;
and (5): and (5) recovering impurities.
2. The microwave regeneration treatment method of the carbon-based catalyst for simultaneous desulfurization and denitrification according to claim 1, characterized in that: the content of the industrial light-burned magnesia MgO adopted by the industrial light-burned magnesia in the step (1) is more than or equal to 80 percent.
3. The microwave regeneration treatment method of the carbon-based catalyst for simultaneous desulfurization and denitrification according to claim 1 or 2, characterized in that: in the step (1), the weight ratio of the light-burned magnesium oxide to the carbon-based catalyst is 1-3: 1.
4. the microwave regeneration treatment method of the carbon-based catalyst for simultaneous desulfurization and denitrification according to claim 1 or 2, characterized in that: the microwave regenerator in the step (2) is a microwave regenerator processed by quartz glass.
5. The microwave regeneration treatment method of the carbon-based catalyst for simultaneous desulfurization and denitrification according to claim 1, characterized in that: the ratio of the microwave radiation power to the mass of the mixture in the step (3) is 20-80W/g.
6. The microwave regeneration treatment method of the carbon-based catalyst for simultaneous desulfurization and denitrification according to claim 1 or 5, characterized in that: in the step (3), the temperature of the mixture of the carbon-based catalyst and the magnesium oxide is raised to 500-800 ℃, and the regeneration duration is 5-20 min.
7. The microwave regeneration treatment method of the carbon-based catalyst for simultaneous desulfurization and denitrification according to claim 1 or 5, characterized in that: heating the mixed material in the step (3) to raise the temperature, and adsorbing sulfur by the carbon-based catalyst with SO2Form desorption, and then reaction with magnesium oxide to be trapped; the chemical reactions that take place during regeneration are:
2H2SO4+C＝SO2+CO2+2H2O
SO2+MgO＝MgSO3
2MgSO3+O2＝2MgSO4
8. the microwave regeneration treatment method of the carbon-based catalyst for simultaneous desulfurization and denitrification according to claim 1, characterized in that: the temperature for cooling the materials in the step (4) is 0-40 ℃.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05161845A (en) * | 1991-12-12 | 1993-06-29 | Nippon Shokubai Co Ltd | Regenerating method for adsorbent |
| CN1669639A (en) * | 2004-12-30 | 2005-09-21 | 昆明理工大学 | Process for regenerating sulfur loading active carbon |
| CN1792450A (en) * | 2005-12-27 | 2006-06-28 | 中国科学院山西煤炭化学研究所 | Method for regenerating charcoal based catalyst for desulphurization and denitration simultaneously |
| CN104190478A (en) * | 2014-09-10 | 2014-12-10 | 清华大学 | Regeneration method of denitration desulfurization active carbon catalyst |
-
2019
- 2019-11-04 CN CN201911066493.8A patent/CN110841725A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05161845A (en) * | 1991-12-12 | 1993-06-29 | Nippon Shokubai Co Ltd | Regenerating method for adsorbent |
| CN1669639A (en) * | 2004-12-30 | 2005-09-21 | 昆明理工大学 | Process for regenerating sulfur loading active carbon |
| CN1792450A (en) * | 2005-12-27 | 2006-06-28 | 中国科学院山西煤炭化学研究所 | Method for regenerating charcoal based catalyst for desulphurization and denitration simultaneously |
| CN104190478A (en) * | 2014-09-10 | 2014-12-10 | 清华大学 | Regeneration method of denitration desulfurization active carbon catalyst |
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