CN110935285A - Regenerative air partial proportioning circulation VOC concentration process - Google Patents
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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
- B01D53/02—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 by adsorption, e.g. preparative gas chromatography
- B01D53/06—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 by adsorption, e.g. preparative gas chromatography with moving adsorbents, e.g. rotating beds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/708—Volatile organic compounds V.O.C.'s
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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
- B01D2258/06—Polluted air
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/40—Further details for adsorption processes and devices
- B01D2259/40083—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption
- B01D2259/40088—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by heating
- B01D2259/4009—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by heating using hot gas
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Abstract
再生空气部分配比循环VOC浓缩工艺,再生温度自动控制装置(8)与温度传感器(9)和VOC浓度传感器(10)通过控制线路连接；再生循环风量自动控制装置(11)与VOC浓度传感器(12)和循环空气调节阀(14)通过控制线路连接；根据处理入口(2)空气中VOC浓度的变化，自动调节再生循环风量，测定处理出口(15)净化后空气的VOC含量，将其作为再生温度自动控制装置(8)再生温度控制信号。浓缩后的VOC浓度变得稳定。在保证高除去率的同时，实现高浓缩倍率。有效保证浓缩后的VOC浓度更高，也可减少燃烧用辅助燃料气体的使用消耗量，实现系统装置进一步优化，降低设备生产成本。
The regeneration air part proportioning and circulating VOC concentration process, the regeneration temperature automatic control device (8) is connected with the temperature sensor (9) and the VOC concentration sensor (10) through the control circuit; the regeneration circulating air volume automatic control device (11) and the VOC concentration sensor ( 12) and the circulating air regulating valve (14) are connected through a control circuit; according to the change of the VOC concentration in the air at the treatment inlet (2), the regeneration circulating air volume is automatically adjusted, and the VOC content of the purified air at the treatment outlet (15) is measured, and used as The regeneration temperature automatic control device (8) regenerates the temperature control signal. The VOC concentration after concentration becomes stable. While ensuring a high removal rate, a high concentration rate is achieved. It can effectively ensure that the concentration of VOC after concentration is higher, and can also reduce the consumption and consumption of auxiliary fuel gas for combustion, realize further optimization of system devices, and reduce equipment production costs.
Description
Technical Field
The invention belongs to the technical field of air purification by recycling steam of a volatile organic solvent from gas in IPC classification B01D53/00, and relates to a VOC treatment technology, in particular to a partial proportioning and circulating VOC concentration process of regenerated air.
Background
VOCs are acronyms for volatile organic compounds (volatile organic compounds). VOCs in the general sense are commanding organic matters; but the definition in the environmental protection meaning refers to an active volatile organic compound, namely a volatile organic compound which can generate harm.
The VOC concentration device concentrates the waste gas with large air volume and low concentration into the waste gas with high concentration and small air volume, thereby reducing the investment cost and the running cost of equipment and improving the high-efficiency treatment of the VOC waste gas. When the waste gas with large air volume and low concentration is combusted and recovered, if a VOC concentration device is not arranged, the waste gas treatment equipment is not only large in size, but also the generated running cost is huge under the condition of directly combusting.
In the basic principle structure of the VOC concentration device, the VOC concentration area can be divided into a treatment area, a regeneration area and a cooling area, and the concentration rotary wheel continuously operates in each area. And the VOC organic waste gas passes through a treatment area of the concentration rotary wheel device after passing through the pre-filter. The VOC is absorbed and removed by the absorbent in the processing area, and the purified air is discharged from the processing area of the concentration rotating wheel. The organic waste gas VOC adsorbed in the concentration rotating wheel is desorbed and concentrated to the extent of 5-15 times by hot air treatment in the regeneration zone. The concentration rotating wheel is cooled in the cooling zone, the air passing through the cooling zone is heated and then used as regeneration air, and the energy-saving effect is achieved.
Chinese patent application 201710795916.4 discloses a novel VOC concentration treatment method, wherein VOC waste gas enters a VOC concentration runner through a filter, the VOC waste gas is adsorbed by zeolite, and the treated tail gas enters a chimney and is discharged into the atmosphere; concentrating the VOC in the VOC concentration rotating wheel into a saturated zeolite area, desorbing by using heat flow provided by a heat exchanger and a heat exchanger, rotating the VOC concentration rotating wheel to a cooling area after the desorption is finished, cooling the VOC concentration rotating wheel by using normal-temperature air, and then rotating the VOC concentration rotating wheel to the concentration area for repeated operation; and pumping the desorbed high-concentration VOC airflow to a combustion device for incineration, and discharging carbon dioxide and water vapor to enter the atmosphere.
Chinese patent application 201810938639.2 discloses a novel VOC concentration system, which comprises a heat accumulating type burner, an adsorption concentration device and a gas heater, wherein one side of the adsorption concentration device is provided with a first gas inlet pipeline and a first gas outlet pipeline; the other side is provided with a second air inlet pipeline and a second air outlet pipeline; a filter screen, a first air distribution disc, a first adsorption layer, a second air distribution disc, a second adsorption layer and a third air distribution disc are sequentially arranged in the adsorption concentration device, an adsorption chamber is formed between the filter screen and a side plate of the adsorption concentration device, and a dust collecting hopper is arranged at the lower end of the adsorption chamber; the first adsorption layer is filled with activated carbon particles, and the second adsorption layer is filled with composite adsorption particles; the heat accumulating type burner is communicated with the adsorption concentration device through a first gas outlet pipeline; the gas heater is communicated with the adsorption concentration device through a second gas inlet pipeline, a second gas outlet pipeline is communicated with the gas inlet end of the gas heater, and a second gas inlet pipeline is communicated with the gas outlet end of the gas heater.
Chinese patent application 201611001565.7 provides a drying apparatus that recovers organic solvent vapor contained in exhaust gas of a dryer that dries an object to be dried containing an organic solvent, and that controls initial cost and running cost. In the invention, the exhaust gas of the coating dryer passes through the desorption area of the VOC concentration rotor, the air from the desorption area is cooled after passing through the sensible heat exchange rotor, the air from the sensible heat exchange rotor passes through the cooling coil for VOC condensation recovery, the air from the cooling coil passes through the adsorption area of the VOC concentration rotor, the air from the adsorption area passes through the sensible heat exchange rotor and then is heated, and the air from the sensible heat exchange rotor passes through the heating coil for drying air supply of the coating dryer. Further, since the heat pump is used for the cooling coil for cooling and condensing the organic solvent and the heating coil for heating the purified air as the supply air of the coating dryer, the drying apparatus as a whole can save energy.
Although, in similar patent applications published, there are proposals for a regeneration air partial circulation flow, and a high concentration ratio can be achieved. However, in order to control the VOC concentration at the regeneration outlet within a certain range of values, automatic control of the regeneration circulation air volume is not adopted.
Disclosure of Invention
The invention aims to provide a process for concentrating VOC (volatile organic compounds) in a part of proportioning and circulating manner in regenerated air, which ensures the concentration of the VOC in treated outlet air to be below a certain value by adopting automatic control of regeneration temperature, and realizes ideal VOC removal rate.
The aim of the invention is achieved by the following technical measures: comprises a VOC concentration rotating wheel, a treatment inlet, a concentration outlet, a fresh air inlet and a treatment outlet; the VOC concentration rotating wheel is provided with a treatment area, a regeneration area and a cooling area; the treatment inlet is connected with the treatment area, the fresh air inlet is connected with the cooling area, the VOC concentration rotating wheels are connected to the treatment outlet through an exhaust pipeline, the VOC concentration rotating wheels are connected out through a regeneration pipeline and then are connected back to the regeneration area through a regeneration heater, one path of the regeneration area is connected out and is directly connected with the concentration outlet through an air regulating valve of the concentration outlet, and the other path of the regeneration area is connected back to the regeneration heater through a circulating air regulating valve; installing a regeneration temperature automatic control device on the regeneration heater, simultaneously installing a temperature sensor on a connecting pipeline of the regeneration heater and the VOC concentration rotating wheel, installing a VOC concentration sensor on a connecting pipeline of the treatment outlet and the VOC concentration rotating wheel, connecting the regeneration temperature automatic control device with the temperature sensor and the VOC concentration sensor through control lines, measuring the VOC content of the air purified at the treatment outlet, and taking the VOC content as a regeneration temperature control signal of the regeneration temperature automatic control device; the VOC concentration sensor is arranged on a pipeline of the concentrated outlet air regulating valve connected with the concentrated outlet, the regeneration circulating air quantity automatic control device is arranged on the concentrated outlet air regulating valve, and the regeneration circulating air quantity automatic control device is connected with the VOC concentration sensor and the circulating air regulating valve through control lines. And automatically adjusting the regeneration circulating air volume according to the change of the VOC concentration in the inlet air.
In particular, a process fan is installed on the line connecting the process inlet to the process zone on the VOC concentration wheel.
In particular, a regeneration fan is arranged on a pipeline connected with a regeneration area on the VOC concentration rotating wheel.
In particular, the VOC concentration wheel has a circular cross-section with a treatment zone sector of 270- & ltSUB & gt 300 DEG, and regeneration and cooling zones each having a sector of 45- & ltSUB & gt 30 deg.
Particularly, 1/3-2/3 flow of the regeneration outlet air of the regeneration heater is led back to the regeneration heater through a circulating air regulating valve.
Particularly, in a treatment area, a regeneration area and a cooling area of the VOC concentration rotary wheel, the air volume ratio of cooling to regeneration is 1: 3: 20-40 (concentration ratio is 20-40 times), and the regeneration air volume ratio α is 1/25-1/10.
The invention has the advantages and effects that: the regeneration circulation air volume is automatically adjusted according to the change of the VOC concentration in the treated inlet air, so that the concentrated VOC concentration becomes stable. The system configuration structure is simple, the automatic operation is realized, the working continuity is strong, the stability is high, and the efficiency is high and the speed is high. High removal rate is ensured and high concentration ratio is realized. Effectively guarantee that the VOC concentration after the concentration is higher, also can reduce the use consumption of auxiliary fuel gas for burning for the VOC burner volume of further corresponding configuration is showing and is dwindling, realizes that system's device further optimizes, reduces equipment manufacturing cost.
Drawings
Fig. 1 is a schematic structural diagram of embodiment 1 of the present invention.
The reference numerals include:
1-VOC concentration rotating wheel, 2-treatment inlet, 3-concentration outlet, 4-fresh air inlet, 5-treatment fan, 6-regeneration fan, 7-regeneration heater, 8-regeneration temperature automatic control device, 9-temperature sensor, 10-VOC concentration sensor, 11-regeneration circulating air quantity automatic control device, 12-VOC concentration sensor, 13-concentration outlet air regulating valve, 14-circulating air regulating valve, 15-treatment outlet, 101-treatment area, 102-regeneration area and 103-cooling area.
Detailed Description
The principle of the invention lies in that redundant heat extraction exists in a VOC concentration and combustion system, a part of regeneration outlet air of a regeneration heater 7, namely 1/3-2/3 flow rate, is controlled and led back to the regeneration heater 7 by adopting an additionally arranged regeneration heating circulation flow, so that the concentration ratio of the concentration outlet air can be improved, the energy is saved, the equipment investment of a combustion device is reduced, and the operation cost cannot be obviously increased.
In the invention, the principle of the process flow of the regenerated air partial circulation VOC concentration also comprises the following steps:
A. since the regeneration circulation air volume is automatically adjusted according to the change of the VOC concentration in the air at the treatment inlet 2, the VOC concentration after concentration becomes stable. The VOC content of the air purified at the treatment outlet 15 is measured and used as a regeneration temperature control signal of the automatic regeneration temperature control device 8. Therefore, the combustion decomposition efficiency of the subsequent combustion device can be improved, and the usage amount of the auxiliary fuel for combustion can be reduced. Further, by controlling the regeneration temperature, even if the VOC concentration in the air at the treatment inlet 2 changes, the removal rate or the air purification rate can be stably ensured.
B. Even if the ratio of the purified air flow rate, i.e., the treated air flow rate, to the concentrated air flow rate, i.e., the regeneration exhaust air flow rate, i.e., the concentration ratio, is high, the ratio of the regeneration air flow rate to the treated air flow rate is rather low, i.e., more regeneration energy is input, so that the removal rate is not significantly reduced, and a high purification rate is ensured.
D. The process design realizes high concentration rate while ensuring high removal rate. Meanwhile, the concentrated VOC concentration is higher, so that the volume of a corresponding combustion device can be reduced, the system device is further optimized, and the production cost of equipment is reduced. Further, since the VOC concentration to the combustion device becomes high, the consumption amount of the auxiliary fuel gas for combustion can be reduced.
The invention comprises the following steps:
VOC concentration runner 1, handle entry 2, concentrated export 3, new trend entry 4 and handle export 15.
The invention is further illustrated by the following figures and examples.
Example 1: as shown in fig. 1, the VOC concentration wheel 1 is provided with a treatment zone 101, a regeneration zone 102 and a cooling zone 103; the treatment inlet 2 is connected to the treatment area 101, the fresh air inlet 4 is connected to the cooling area 103, the VOC concentration runner 1 is connected to the treatment outlet 15 through an external discharge pipeline, the VOC concentration runner 1 is connected out through a regeneration pipeline and then connected back to the regeneration area 102 through the regeneration heater 7, one path of the regeneration area 102 is directly connected to the concentration outlet 3 through the concentration outlet air regulating valve 13, and the other path of the regeneration area is connected back to the regeneration heater 7 through the circulating air regulating valve 14; a regeneration temperature automatic control device 8 is arranged on the regeneration heater 7, meanwhile, a temperature sensor 9 is arranged on a connecting pipeline of the regeneration heater 7 and the VOC concentration rotating wheel 1, a VOC concentration sensor 10 is arranged on a connecting pipeline of the treatment outlet 15 and the VOC concentration rotating wheel 1, and the regeneration temperature automatic control device 8 is connected with the temperature sensor 9 and the VOC concentration sensor 10 through control lines; a VOC concentration sensor 12 is arranged on a pipeline connecting the concentration outlet 3 with the concentration outlet air regulating valve 13, a regeneration circulation air volume automatic control device 11 is arranged on the concentration outlet air regulating valve 13, and the regeneration circulation air volume automatic control device 11 is connected with the VOC concentration sensor 12 and the circulation air regulating valve 14 through control lines.
In the foregoing, the treatment fan 5 is installed on the line connecting the treatment inlet 2 to the treatment zone 101 of the VOC concentration wheel 1.
In the foregoing, the regeneration zone 102 on the VOC concentration wheel 1 is connected to a pipeline and a regeneration fan 6 is installed thereon.
In the above, the sector surface of the treating zone 101 is 270-300 °, and the regeneration zone 102 and the cooling zone 103 are 45-30 ° on the circular cross section of the VOC concentration wheel 1.
Among the above, 1/3-2/3 flow rate of the regeneration outlet air of the regenerative heater 7 is introduced back to the regenerative heater 7 through the circulation air regulating valve 14.
In the embodiment of the invention, the air volume of the VOC-containing air at the treatment inlet 2 is 20-40 units, the air volume of the VOC-containing air concentrated at the concentration outlet 3 is 1-3 units, and the air volume of the VOC-purified at the treatment outlet 15 is 20-40 units, in the treatment area 101, the regeneration area 102 and the cooling area 103 of the VOC concentration runner 1, the air volume ratio is cooling, regeneration, treatment is 1: 3: 20-40 (concentration ratio is 20-40 times), and the regeneration air volume ratio α is 1/25-1/10.
In the embodiment of the present invention, in a normal condition, the regeneration air volume of the regenerative heater 7 is not circulated, and the concentration ratio of the VOC concentration runner 1 is only 7 times, but if the new regeneration air volume part of the regenerative heater 7 enters the circulation flow, the concentration ratio of the VOC concentration runner 1 is about 21 times. The removal rate is expected to reach a high level corresponding to a 10-fold concentration in the usual procedure. On the premise of ensuring the purification rate, the concentration ratio can be improved by more than 3 times compared with the common flow without regeneration circulation.
Claims (6)
1. The regenerated air partial proportioning circulation VOC concentration process comprises a VOC concentration rotary wheel (1), a treatment inlet (2), a concentration outlet (3), a fresh air inlet (4) and a treatment outlet (15); the VOC concentration rotating wheel (1) is provided with a treatment area (101), a regeneration area (102) and a cooling area (103); the treatment inlet (2) is connected into a treatment area (101), the fresh air inlet (4) is connected into a cooling area (103), the VOC concentration rotating wheel (1) is connected to a treatment outlet (15) through an external discharge pipeline, the VOC concentration rotating wheel (1) is connected out through a regeneration pipeline and then is connected back to a regeneration area (102) through a regeneration heater (7), one path of the regeneration area (102) is directly connected with the concentration outlet (3) through a concentration outlet air regulating valve (13), and the other path of the regeneration area is connected back to the regeneration heater (7) through a circulating air regulating valve (14); the device is characterized in that a regeneration temperature automatic control device (8) is arranged on a regeneration heater (7), meanwhile, a temperature sensor (9) is arranged on a connecting pipeline of the regeneration heater (7) and a VOC concentration rotating wheel (1), a VOC concentration sensor (10) is arranged on a connecting pipeline of a treatment outlet (15) and the VOC concentration rotating wheel (1), and the regeneration temperature automatic control device (8) is connected with the temperature sensor (9) and the VOC concentration sensor (10) through control lines; a VOC concentration sensor (12) is arranged on a pipeline connecting the concentration outlet (3) with the concentration outlet air regulating valve (13), a regeneration circulating air volume automatic control device (11) is arranged on the concentration outlet air regulating valve (13), and the regeneration circulating air volume automatic control device (11) is connected with the VOC concentration sensor (12) and the circulating air regulating valve (14) through control lines; according to the change of the VOC concentration in the air at the treatment inlet (2), the regeneration circulating air volume is automatically adjusted, the VOC content of the air purified at the treatment outlet (15) is measured, and the VOC content is used as a regeneration temperature control signal of the regeneration temperature automatic control device (8).
2. A process for VOC concentration according to claim 1 with regenerative air partial proportioning cycle, characterized in that a process fan (5) is installed on the line connecting the process inlet (2) to the process zone (101) on the VOC concentration wheel (1).
3. A process for VOC concentration according to claim 1 with regenerative air partial ratio recycle, characterized in that the regeneration zone (102) on the VOC concentration wheel (1) is connected to a pipeline on which a regeneration fan (6) is installed.
4. The process for VOC concentration with partial recirculation of regeneration air as claimed in claim 1, characterized in that the sector surface of the treatment zone (101) is 270-300 °, the regeneration zone (102) and the cooling zone (103) each have a value of 45-30 ° in the circular cross-section of the VOC concentration wheel (1).
5. A process for VOC concentration according to claim 1 with regeneration air partial ratio circulation, characterized in that the flow of 1/3-2/3 of regeneration outlet air of the regeneration heater (7) is led back to the regeneration heater (7) through the circulation air regulating valve (14).
6. The process for concentrating VOC by using the regenerated air with partial proportioning circulation as claimed in claim 1, wherein the air volume ratio of cooling to regeneration in the treatment zone (101), the regeneration zone (102) and the cooling zone (103) of the VOC concentration runner (1) is 1: 3: 20-40, namely the concentration ratio is 20-40 times, and the regeneration air volume ratio α is 1/25-1/10.
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| CN201911422984.1A CN110935285A (en) | 2019-12-31 | 2019-12-31 | Regenerative air partial proportioning circulation VOC concentration process |
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| CN201911422984.1A CN110935285A (en) | 2019-12-31 | 2019-12-31 | Regenerative air partial proportioning circulation VOC concentration process |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111558281A (en) * | 2020-06-19 | 2020-08-21 | 西部技研环保节能设备（常熟）有限公司 | 250 ℃ high-temperature continuous regeneration double-area cooling synergistic VOC (volatile organic compound) concentration system |
| WO2022219087A1 (en) * | 2021-04-16 | 2022-10-20 | Sally R Ab | Air treatment module |
| WO2023040831A1 (en) * | 2021-09-17 | 2023-03-23 | 苏州兆和环能科技有限公司 | Organic gas recovery modular assembly and coating machine waste gas treatment system |
| CN119971736A (en) * | 2025-03-04 | 2025-05-13 | 泰州市伟博助剂厂 | A heating type circulating regeneration device for adsorbent desorption |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006187698A (en) * | 2005-01-04 | 2006-07-20 | Seibu Giken Co Ltd | Organic solvent gas processing equipment |
| JP2007260506A (en) * | 2006-03-27 | 2007-10-11 | Hitachi Plant Technologies Ltd | Dehumidifier |
-
2019
- 2019-12-31 CN CN201911422984.1A patent/CN110935285A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006187698A (en) * | 2005-01-04 | 2006-07-20 | Seibu Giken Co Ltd | Organic solvent gas processing equipment |
| JP2007260506A (en) * | 2006-03-27 | 2007-10-11 | Hitachi Plant Technologies Ltd | Dehumidifier |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111558281A (en) * | 2020-06-19 | 2020-08-21 | 西部技研环保节能设备（常熟）有限公司 | 250 ℃ high-temperature continuous regeneration double-area cooling synergistic VOC (volatile organic compound) concentration system |
| WO2022219087A1 (en) * | 2021-04-16 | 2022-10-20 | Sally R Ab | Air treatment module |
| WO2023040831A1 (en) * | 2021-09-17 | 2023-03-23 | 苏州兆和环能科技有限公司 | Organic gas recovery modular assembly and coating machine waste gas treatment system |
| CN119971736A (en) * | 2025-03-04 | 2025-05-13 | 泰州市伟博助剂厂 | A heating type circulating regeneration device for adsorbent desorption |
| CN119971736B (en) * | 2025-03-04 | 2025-08-08 | 泰州市伟博助剂厂 | Heating type circulating regeneration device for desorption of adsorbent |
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