CN113713794A - Desulfurization activated carbon regeneration system and method by utilizing microwave coupling hydrogen peroxide - Google Patents
Desulfurization activated carbon regeneration system and method by utilizing microwave coupling hydrogen peroxide Download PDFInfo
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- CN113713794A CN113713794A CN202111052994.8A CN202111052994A CN113713794A CN 113713794 A CN113713794 A CN 113713794A CN 202111052994 A CN202111052994 A CN 202111052994A CN 113713794 A CN113713794 A CN 113713794A
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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
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/34—Regenerating or reactivating
- B01J20/3416—Regenerating or reactivating of sorbents or filter aids comprising free carbon, e.g. activated carbon
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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
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising 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
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/34—Regenerating or reactivating
- B01J20/3441—Regeneration or reactivation by electric current, ultrasound or irradiation, e.g. electromagnetic radiation such as X-rays, UV, light, microwaves
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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
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/34—Regenerating or reactivating
- B01J20/345—Regenerating or reactivating using a particular desorbing compound or mixture
- B01J20/3475—Regenerating or reactivating using a particular desorbing compound or mixture in the liquid phase
Abstract
The invention belongs to the technical field of desulfurization catalyst regeneration, and relates to a desulfurization activated carbon regeneration system and a desulfurization activated carbon regeneration method by using microwave coupling hydrogen peroxide, wherein the system comprises an activated carbon regeneration tower, a microwave generator and a spraying device for spraying a solution into the activated carbon regeneration tower, wherein the microwave generator is arranged on the activated carbon regeneration tower; the active carbon regeneration tower is also connected with a purging pipeline, a drainage pipeline and a tail gas discharge pipeline. When the regeneration is carried out, the microwave generator and the spraying device are started, and under the condition of coexistence of microwave radiation and hydrogen peroxide, a large amount of hydroxyl radicals can be generated, so that sulfur simple substances adsorbed in the activated carbon are oxidized to generate sulfate radicals, and desulfurization regeneration is realized; and the potassium dichromate is used for further removing sulfur simple substances in the activated carbon, and chromium elements remained on the activated carbon play a role in catalysis, so that the desulfurization efficiency of the activated carbon is increased. The regeneration method has the advantages of short time, low cost, high efficiency, and no secondary pollution, and can produce by-products with economic value.
Description
Technical Field
The invention belongs to the technical field of desulfurization activated carbon regeneration, and particularly relates to a desulfurization activated carbon regeneration system and method by utilizing microwave coupling hydrogen peroxide.
Background
Activated carbon is widely used for purification treatment of waste water and waste gas due to its advantages of low cost, good treatment effect and simple process equipment, such as adsorption of dyes in water or removal of sulfides in blast furnace gas. But the treatment effect is greatly reduced after the adsorption capacity reaches saturation due to the limitation of the specific surface area and the pore volume of the activated carbon. If the waste activated carbon is directly treated, a large landfill site is required for landfill treatment, or the waste activated carbon is treated by burning, which not only wastes resources, but also causes serious pollution to the atmospheric environment, and also needs to pay high cost. Therefore, the regeneration technology with economic value and environmental protection has obvious advantages and significance, namely, the pore channels occupied by the pollutants on the surface of the active carbon are released by a regeneration means, and the adsorption capacity of the active carbon is recovered again.
The regeneration method of activated carbon commonly used in the process includes a thermal regeneration method, a solvent method and the like. The thermal regeneration method refers to the treatment of waste activated carbon under the conditions of high temperature and certain gas atmosphere, for example, chinese patent document No. CN201711361255 discloses an activated carbon regeneration device and a regeneration method thereof, and introduces the thermal regeneration method and related equipment. The thermal regeneration method has the advantages of high regeneration efficiency, short time, universality on adsorbates and the like, but has high cost and large carbon loss, and most of the thermal regeneration method forcibly replaces or releases substances adsorbed in the waste activated carbon, does not degrade and remove the substances, and is easy to generate harmful gases. The solvent law refers to a method for regenerating waste activated carbon by soaking the waste activated carbon in a specific solution, and commonly used solvents comprise inorganic solvents (hydrochloric acid, sodium hydroxide solution and the like) and organic solvents (benzene, methanol and the like), and the method has the advantages that useful substances can be recovered by recycling waste liquid in the regeneration process, the carbon loss is small, the regeneration efficiency is low, a large amount of waste water is generated, and the activated carbon is easily corroded by chemicals.
Disclosure of Invention
In view of the above, the present invention provides a system and a method for regenerating desulfurized activated carbon using microwave coupled hydrogen peroxide to solve the above drawbacks of the regeneration method.
In order to achieve the purpose, the invention provides the following technical scheme:
a desulfurization activated carbon regeneration system utilizing microwave coupling hydrogen peroxide comprises an activated carbon regeneration tower, a microwave generator and a spraying device, wherein the spraying device is used for spraying a solution into the activated carbon regeneration tower; the active carbon regeneration tower is also connected with a purging pipeline, a drainage pipeline and a tail gas discharge pipeline.
Further, the spraying device comprises a hydrogen peroxide storage tank, a potassium dichromate storage tank and a plurality of nozzles, the nozzles are arranged at the top of the activated carbon regeneration tower, and the nozzles are respectively communicated with the hydrogen peroxide storage tank and the potassium dichromate storage tank through pipelines; and the connecting pipelines between the nozzle and the hydrogen peroxide storage tank and between the nozzle and the potassium dichromate storage tank are respectively provided with an adjusting valve and a stop valve.
Further, all be equipped with the trip valve on sweeping pipeline, drain line, the tail gas delivery pipeline, it still is equipped with the blast gate on pipeline and the tail gas delivery pipeline to sweep.
Furthermore, the output power of the microwave generator is 250-1000W and is continuously adjustable, and the emission time is 0-9999 min and is continuously adjustable.
A method for regenerating desulfurization active carbon by using microwave coupled hydrogen peroxide adopts the desulfurization active carbon regeneration system by using microwave coupled hydrogen peroxide, and comprises the following steps:
1) acquiring the weight of the activated carbon to be regenerated, and setting heating parameters of a microwave generator according to the weight; simultaneously adding hydrogen peroxide with set concentration into a hydrogen peroxide storage tank;
2) presetting the output power and emission time required by a microwave generator according to the weight of the activated carbon to be regenerated;
3) closing the purging pipeline, the drainage pipeline and the tail gas discharge pipeline, and starting the microwave generator to heat the activated carbon; after heating to a set temperature, opening a hydrogen peroxide storage tank, controlling the flow of hydrogen peroxide through an adjusting valve, spraying the hydrogen peroxide into an activated carbon regeneration tower through a nozzle, and oxidizing elemental sulfur by using the hydrogen peroxide to remove sulfur adsorbed in the activated carbon;
4) after the emission time is over, closing the microwave generator and the spraying device, opening a drainage pipeline, and discharging the generated solution;
5) opening a potassium dichromate storage tank, introducing a potassium dichromate solution into the activated carbon regeneration tower through a nozzle, removing elemental sulfur remained on the activated carbon, and enabling the activated carbon to adsorb chromium elements; opening a drainage pipeline to discharge the generated solution;
6) and after the solution is completely discharged, closing the drainage pipeline, opening the purging pipeline and the tail gas discharge pipeline, blowing inert gas into the activated carbon regeneration tower through the purging pipeline, purging, discharging residual gas in the activated carbon regeneration tower from the tail gas discharge pipeline, and finishing the regeneration of the activated carbon.
Further, the concentration of the hydrogen peroxide solution in the hydrogen peroxide storage tank is 1-30%.
Further, the ratio of the emission time of the microwave generator to the weight of the activated carbon is 0.5: 1-2: 1, and the temperature of the activated carbon is controlled to be 80-600 ℃; wherein the unit of emission time is minutes, and the unit of mass of the activated carbon is grams.
Further, the inert gas is nitrogen or argon.
Further, controlling the flow rate of the inert gas to be 1-5L/min, wherein the ratio of the purging time to the weight of the activated carbon is 1: 1-5: 1; wherein the unit of purging time is minutes, and the unit of activated carbon mass is grams.
Further, the activated carbon is one or a mixture of more of coal-based activated carbon, biomass activated carbon and wood activated carbon.
The invention has the beneficial effects that:
1) the invention realizes the rapid regeneration of the waste desulfurization activated carbon, and the regenerated activated carbon has high sulfur capacity recovery rate, small mechanical abrasion of the activated carbon, low hydrogen peroxide and microwave generation operation cost and recyclable waste liquid.
2) The regeneration tower can adopt a fixed bed or moving bed process, no moving equipment is arranged in the tower, and the damage of the desulfurization catalyst is small.
3) In the invention, hydrogen peroxide solution is firstly used for desulfurization treatment, and a large amount of hydroxyl free radicals can be generated under the condition of coexistence of microwave radiation and hydrogen peroxide, so that sulfur simple substances adsorbed in the activated carbon are oxidized to generate sulfate radicals; then introducing a potassium dichromate solution, wherein the potassium dichromate can remove untreated sulfur simple substances on the activated carbon on one hand; on the other hand, the activated carbon is used for removing sulfides, and chromium elements remained on the activated carbon can participate in the desulfurization process after the activated carbon is regenerated, so that the catalysis effect is achieved, and the desulfurization efficiency of the activated carbon is increased.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic diagram of a system for regenerating desulfurized activated carbon using microwave coupled hydrogen peroxide in accordance with the present invention;
reference numerals: 1-an active carbon regeneration tower; 2-a microwave generator; 3-a spraying device; 4-purging the pipeline; 5-an air valve; 6-a shut-off valve; 7-adjusting valve; 8-a shut-off valve; 9-hydrogen peroxide storage tank; 10-a drain line; 11-a shut-off valve; 12-a tail gas discharge pipeline; 13-a blast gate; 14-a shut-off valve; 15-adjusting valve; 16-a shut-off valve; 17-potassium dichromate storage tank.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
Example 1
Referring to fig. 1, the desulfurization activated carbon regeneration system using microwave coupled hydrogen peroxide includes an activated carbon regeneration tower 1, a microwave generator 2, and a spray device 3 for spraying a solution into the activated carbon regeneration tower 1, wherein the microwave generator 2 is installed on a side wall of the activated carbon regeneration tower 1; the activated carbon regeneration tower 1 is also connected with a purging pipeline 4, a drainage pipeline 10 and a tail gas discharge pipeline 12.
The spraying device 3 comprises a hydrogen peroxide storage tank 9, a potassium dichromate storage tank 17 and a plurality of nozzles, the nozzles are installed at the top of the activated carbon regeneration tower 1, and the nozzles are respectively communicated with the hydrogen peroxide storage tank 9 and the potassium dichromate storage tank 17 through pipelines; and the connecting pipelines between the nozzle and the hydrogen peroxide storage tank 9 and between the nozzle and the potassium dichromate storage tank 17 are respectively provided with a regulating valve 7, a stop valve 8, a regulating valve 15 and a stop valve 16.
Wherein, install trip valve 6 on sweeping pipeline 4, install trip valve 11 on the drain line 10, install trip valve 14 on the exhaust emission pipeline 12, still install blast gate 5 on sweeping pipeline 4, still install blast gate 13 on the exhaust emission pipeline 12.
The output power of the microwave generator 2 is 250-1000W and is continuously adjustable, and the emission time is 0-9999 min and is continuously adjustable.
A method for regenerating desulfurization active carbon by using microwave coupled hydrogen peroxide adopts the desulfurization active carbon regeneration system by using microwave coupled hydrogen peroxide, and comprises the following steps:
1) acquiring the weight of the activated carbon to be regenerated, and setting heating parameters of the microwave generator 2 according to the weight; simultaneously adding hydrogen peroxide with set concentration into a hydrogen peroxide storage tank 9;
2) the output power and the emission time required by the microwave generator 2 are preset according to the weight of the activated carbon to be regenerated;
3) closing the purging pipeline 4, the drainage pipeline 10 and the tail gas discharge pipeline 12, and starting the microwave generator 2 to heat the activated carbon; after heating to a set temperature, opening a hydrogen peroxide storage tank 9, controlling the flow of hydrogen peroxide through an adjusting valve 7, spraying hydrogen peroxide into the activated carbon regeneration tower 1 through a nozzle, and oxidizing elemental sulfur by using the hydrogen peroxide to remove sulfur adsorbed in the activated carbon;
4) after the emission time is over, the microwave generator 2 and the spraying device 3 are closed, the drainage pipeline 10 is opened, and the generated solution is discharged;
5) opening a potassium dichromate storage tank 17, controlling the flow of a potassium dichromate solution through an adjusting valve 15, introducing the potassium dichromate solution into the activated carbon regeneration tower 1 through a nozzle, removing elemental sulfur remained on the activated carbon, and enabling the activated carbon to adsorb chromium elements; then the drainage pipeline 10 is opened to drain the generated solution;
6) after the solution is completely discharged, closing the drainage pipeline 10, opening the purging pipeline 4 and the tail gas discharge pipeline 12, blowing nitrogen or argon into the activated carbon regeneration tower 1 through the purging pipeline 4, purging, controlling the flow of inert gas to be 1-5L/min, and controlling the ratio of purging time to activated carbon weight to be 1: 1-5: 1; wherein the unit of purging time is minutes, and the unit of activated carbon mass is grams; and discharging residual gas in the activated carbon regeneration tower 1 from the tail gas discharge pipeline 12 to finish the regeneration of the activated carbon.
Wherein the weight of the activated carbon to be desulfurized is 100g, the activated carbon to be desulfurized is loaded into an activated carbon regeneration tower, the microwave generation time is set to be 60min, the output power is 800w, the temperature of the activated carbon is controlled to be 80 ℃, the concentration of hydrogen peroxide is 10%, and the waste desulfurized activated carbon is subjected to regeneration treatment.
Example 2
The difference between the embodiment and the embodiment 1 is that the weight of the activated carbon to be desulfurized is 100g, the activated carbon is loaded into an activated carbon regeneration tower, the microwave generation time is set to be 120min, the output power is 600w, and the temperature of the activated carbon is controlled to be 200 ℃; the concentration of hydrogen peroxide is 20 percent, and the waste desulfurization active carbon is regenerated.
The regenerated activated carbon obtained in the embodiment 1 and the embodiment 2 is subjected to saturated sulfur capacity measurement, wherein the saturated sulfur capacity of the regenerated activated carbon in the embodiment 1 reaches 150mg/g and reaches 42.9 percent of the original saturated sulfur capacity; the saturated sulfur capacity of the regenerated activated carbon in the example 2 reaches 188mg/g, and reaches 53.7 percent of the original saturated sulfur capacity.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (10)
1. A desulfurization activated carbon regeneration system using microwave coupling hydrogen peroxide is characterized in that: the device comprises an activated carbon regeneration tower, a microwave generator and a spraying device for spraying a solution into the activated carbon regeneration tower, wherein the microwave generator is arranged on the activated carbon regeneration tower; the active carbon regeneration tower is also connected with a purging pipeline, a drainage pipeline and a tail gas discharge pipeline.
2. The desulfurization activated carbon regeneration system using microwave-coupled hydrogen peroxide according to claim 1, characterized in that: the spraying device comprises a hydrogen peroxide storage tank, a potassium dichromate storage tank and a plurality of nozzles, the nozzles are arranged at the top of the activated carbon regeneration tower, and the nozzles are respectively communicated with the hydrogen peroxide storage tank and the potassium dichromate storage tank through pipelines; and the connecting pipelines between the nozzle and the hydrogen peroxide storage tank and between the nozzle and the potassium dichromate storage tank are respectively provided with an adjusting valve and a stop valve.
3. The desulfurization activated carbon regeneration system using microwave-coupled hydrogen peroxide according to claim 1, characterized in that: the pipeline, the drainage pipeline, the tail gas discharge pipeline all are equipped with the trip valve on sweeping, it still is equipped with the blast gate on pipeline and the tail gas discharge pipeline all to sweep.
4. The desulfurization activated carbon regeneration system using microwave-coupled hydrogen peroxide according to claim 1, characterized in that: the output power of the microwave generator is 250-1000W and is continuously adjustable, and the emission time is 0-9999 min and is continuously adjustable.
5. A method for regenerating desulfurization activated carbon by using microwave coupled hydrogen peroxide is characterized by comprising the following steps: the desulfurization activated carbon regeneration system using microwave-coupled hydrogen peroxide according to any one of claims 1 to 4, comprising the steps of:
1) acquiring the weight of the activated carbon to be regenerated, and setting heating parameters of a microwave generator according to the weight; simultaneously adding hydrogen peroxide with set concentration into a hydrogen peroxide storage tank;
2) presetting the output power and emission time required by a microwave generator according to the weight of the activated carbon to be regenerated;
3) closing the purging pipeline, the drainage pipeline and the tail gas discharge pipeline, and starting the microwave generator to heat the activated carbon; after heating to a set temperature, opening a hydrogen peroxide storage tank, controlling the flow of hydrogen peroxide through an adjusting valve, spraying the hydrogen peroxide into an activated carbon regeneration tower through a nozzle, and oxidizing elemental sulfur by using the hydrogen peroxide to remove sulfur adsorbed in the activated carbon;
4) after the emission time is over, closing the microwave generator and the spraying device, opening a drainage pipeline, and discharging the generated solution;
5) opening a potassium dichromate storage tank, introducing a potassium dichromate solution into the activated carbon regeneration tower through a nozzle, removing elemental sulfur remained on the activated carbon, and enabling the activated carbon to adsorb chromium elements; opening a drainage pipeline to discharge the generated solution;
6) and after the solution is completely discharged, closing the drainage pipeline, opening the purging pipeline and the tail gas discharge pipeline, blowing inert gas into the activated carbon regeneration tower through the purging pipeline, purging, discharging residual gas in the activated carbon regeneration tower from the tail gas discharge pipeline, and finishing the regeneration of the activated carbon.
6. The method for regenerating desulfurization activated carbon by using microwave-coupled hydrogen peroxide according to claim 5, characterized in that: the concentration of the hydrogen peroxide solution in the hydrogen peroxide storage tank is 1-30%.
7. The method for regenerating desulfurization activated carbon by using microwave-coupled hydrogen peroxide according to claim 5, characterized in that: the ratio of the emission time of the microwave generator to the weight of the activated carbon is 0.5: 1-2: 1, and the temperature of the activated carbon is controlled to be 80-600 ℃; wherein the unit of emission time is minutes, and the unit of mass of the activated carbon is grams.
8. The method for regenerating desulfurization activated carbon by using microwave-coupled hydrogen peroxide according to claim 5, characterized in that: the inert gas is nitrogen or argon.
9. The method for regenerating desulfurization activated carbon by using microwave-coupled hydrogen peroxide according to claim 5, characterized in that: controlling the flow rate of the inert gas to be 1-5L/min, wherein the ratio of the purging time to the weight of the activated carbon is 1: 1-5: 1; wherein the unit of purging time is minutes, and the unit of activated carbon mass is grams.
10. The method for regenerating desulfurization activated carbon by using microwave-coupled hydrogen peroxide according to claim 5, characterized in that: the active carbon is one or a mixture of coal active carbon, biomass active carbon and wood active carbon.
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Cited By (1)
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| CN115569645A (en) * | 2022-10-19 | 2023-01-06 | 广东佳纳能源科技有限公司 | Method and device for regenerating activated carbon |
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