CN219897572U - Safe and efficient organic solvent recycling device - Google Patents
Safe and efficient organic solvent recycling device Download PDFInfo
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- CN219897572U CN219897572U CN202321203541.5U CN202321203541U CN219897572U CN 219897572 U CN219897572 U CN 219897572U CN 202321203541 U CN202321203541 U CN 202321203541U CN 219897572 U CN219897572 U CN 219897572U
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Abstract
The utility model relates to a safe and efficient organic solvent recovery treatment device, in particular to the technical field of organic waste gas treatment equipment. The utility model comprises a surface cooling filter, an adsorption fan, more than two active carbon adsorption beds, a dry filter, a zeolite rotating wheel, a chimney, a first desorption fan, a cooler, a second desorption fan, a first heater and a second heater, wherein the zeolite rotating wheel is used as a secondary adsorption device, compared with the existing nitrogen desorption recovery process, the investment cost is equivalent, but the system safety is higher, the purification efficiency is high, the system occupation area is small, and the large-air-volume low-concentration organic waste gas discharged by the adsorption of the active carbon is concentrated into small-air-volume medium-high-concentration waste gas by using the zeolite rotating wheel as the secondary adsorption system and is returned to the adsorption system, so that the purification efficiency and recovery efficiency of the system are greatly improved.
Description
Technical Field
The utility model relates to the technical field of organic waste gas treatment equipment, in particular to a safe and efficient organic solvent recovery treatment device.
Background
The development of low-carbon economy is not only to actively take on environmental protection responsibility, but also to meet the requirements of national energy saving and consumption reduction indexes; on the other hand, the economic structure is adjusted, the energy utilization benefit is improved, and the requirements of emerging industry and ecological civilization construction are developed. In the volatile organic waste gas treatment technology, the organic solvent recovery technology not only can realize energy conservation and emission reduction and reduce the emission of greenhouse gases, but also saves a great amount of solvent purchasing funds for enterprises, reduces the production cost, generates great economic benefits, truly realizes both economic and social development and ecological environment protection win-win, and has great practical significance for promoting the development of circular economy and establishing a sustainable development society.
Along with the continuous deepening of the organic waste gas treatment process, the energy-saving requirement of the solvent recovery process technology is also continuously improved, so that the method has become an important subject on how to reduce the investment cost and the operation cost of enterprises while ensuring the effective recovery treatment of the organic waste gas. In recent years, the solvent recovery process using inert gas nitrogen as a desorption medium has been widely accepted and applied in the market due to the advantages of high adsorption recovery efficiency, high safety, wide application range and the like, the technology successfully solves the defects of the traditional vapor desorption, greatly widens the application range of solvent recovery, but the method also has the defects of high energy consumption, high operation cost and the like, and particularly for the treatment of medium-high concentration waste gas, multistage adsorption is often adopted to ensure the standard emission of the tail gas, so that the investment cost and the operation cost of the system are greatly increased, and the occupation area of the system is also greatly demanded.
In recent years, the solvent recovery process using inert gas nitrogen as a desorption medium has been widely accepted and applied in the market due to the advantages of high adsorption recovery efficiency, high safety, wide application range and the like. The recovery process uses nitrogen as a carrier to carry out high-temperature desorption regeneration on the activated carbon, and after the desorbed high-concentration organic waste gas is cooled by a high-efficiency cooler, most of organic solvent is recovered, and uncondensed gas is heated by a heater and then continuously blown off the activated carbon until the desorption is completed. Considering that a small amount of non-condensable gas can not be condensed and recovered all the time in the desorption process, the existing nitrogen desorption recovery process adopts a mode of adding a secondary active carbon adsorption bed to adsorb and purify the organic components, and also adopts a reverse blowing process as the process of the utility model patent ZL 2013 1 0520571.3 of an active carbon adsorption and N2 desorption recovery process of organic waste gas, so that a small amount of organic components remained in the active carbon are blown to other adsorption beds to be adsorbed and then discharged, thereby realizing the thorough regeneration of the active carbon.
The existing nitrogen desorption recovery process has the following problems:
(1) The two-stage active carbon adsorption bed is newly added on the desorption pipeline, and the adsorption bed also needs to be matched with a desorption regeneration system, so that the whole process route is complex, the investment cost is high, and the occupied area of the system is large.
(2) By using the back-flushing process, the back-flushing air volume is large (about 50% -80% of the treatment air volume), and the blown waste gas returns to the adsorption front end, so that the load of the adsorption system is increased and the investment cost is increased.
(3) The back-flushing process adopts hot air to flush, and considers that the activated carbon is a combustible substance, when the activated carbon adsorbed with oxygen is overheated, even if substances such as solvents and the like are not present, the activated carbon can catch fire at a lower temperature, and certain potential safety hazard exists.
(4) With the increasingly strict environmental protection requirements, particularly for the treatment of medium and high concentration, the adsorption and purification efficiency of the activated carbon cannot meet the emission requirements, and the purification efficiency is often improved by adopting multistage activated carbon serial adsorption, so that the investment cost is increased and the occupied area is large.
Disclosure of Invention
(1) Technical proposal
In order to solve the technical problems, the utility model provides a safe and efficient organic solvent recovery treatment device which comprises a surface cooling filter, an adsorption fan, more than two activated carbon adsorption beds, a dry filter, a zeolite rotating wheel, a chimney, a first desorption fan, a cooler, a second desorption fan, a first heater and a second heater, wherein one end of the surface cooling filter is connected with an exhaust gas inlet pipe, and the other end of the surface cooling filter is connected with one end of the adsorption fan through a pipeline.
Every all be equipped with on the active carbon adsorption bed and adsorb entry, adsorb export, desorption entry, desorption export, every adsorb the entry respectively through the pipeline with the adsorption fan other end is linked together, every adsorb the export respectively through the pipeline with dry-type filter one end is linked together, dry-type filter's the other end through first pipeline with zeolite runner's adsorption zone entry links to each other, adsorb the export in district through the pipeline with the chimney links to each other, on the first pipeline through the second pipeline with zeolite runner's cooling zone entry links to each other, the export in cooling zone pass through the pipeline with second heater one end links to each other, the second heater other end pass through the pipeline with zeolite runner's desorption zone entry links to each other, desorption zone's export pass through the pipeline with second desorption fan one end links to each other, the second desorption fan other end pass through the pipeline with waste gas admission pipe intercommunication, first desorption fan one end is connected with nitrogen gas admission pipe, the first desorption fan other end pass through the pipeline with cooler one end links to each other, the cooler other end passes through the pipeline and first heater one end links to each other with each other through each other with each other that the active carbon enters into through the desorption entry respectively.
Preferably, the bottom of the cooler is connected with a recovery liquid storage tank through a pipeline.
Preferably, an oxygen content analyzer is arranged on a connecting pipeline of the cooler and the first heater.
Preferably, a control valve is arranged on the nitrogen inlet pipe.
(2) Advantageous effects
The utility model provides an active carbon adsorption-nitrogen desorption coupling zeolite runner adsorption concentration technology to realize the efficient recovery and treatment of organic waste gas, and utilizes the molecular sieve runner to carry out secondary adsorption, so that the discharged tail gas is purified on one hand, the tail gas is ensured to reach the standard, and on the other hand, the air quantity after the concentration of the runner is small and returns to the adsorption front end, thereby reducing the load of an adsorption system and greatly improving the purification efficiency and recovery efficiency of the system. Compared with the prior art, the method has the following beneficial effects:
1. the back-flushing process is eliminated, and the system safety is improved.
2. Compared with the existing nitrogen desorption recovery process, the zeolite rotating wheel is adopted as a secondary adsorption device, the investment cost is equivalent, but the system safety is higher, the purification efficiency is high, and the occupied area of the system is small.
3. The desorption air quantity of the rotating wheel during desorption is small (about 5% -15% of the treatment air quantity), and the load of an adsorption system is reduced.
4. The zeolite rotating wheel is used as a secondary adsorption system, and the large-air-volume low-concentration organic waste gas discharged by the adsorption of the activated carbon is concentrated into small-air-volume medium-high-concentration waste gas, and the small-air-volume medium-high-concentration waste gas is returned to the adsorption system, so that the purification efficiency and the recovery efficiency of the system are greatly improved.
Drawings
Fig. 1 is a schematic structural view of the present utility model.
The reference numerals are: 1-surface cooling filter, 2-adsorption blower, 3-activated carbon adsorption bed, 31-adsorption inlet, 32-adsorption outlet, 33-desorption inlet, 34-desorption outlet, 4-dry filter, 5-zeolite runner, 51-adsorption zone, 52-desorption zone, 53-cooling zone, 6-chimney, 7-first desorption blower, 8-cooler, 9-second desorption blower, 10-oxygen content analyzer, 11-first heater, 12-second heater, 13-recovery liquid storage tank, 14-exhaust gas inlet pipe, 15-nitrogen inlet pipe, 16-control valve, 17-first pipeline, 18-second pipeline.
Detailed Description
The utility model will be further described with reference to the accompanying drawings and examples.
As shown in fig. 1, the safe and efficient organic solvent recovery treatment device comprises a surface cooling filter 1, an adsorption fan 2, more than two activated carbon adsorption beds 3, a dry filter 4, a zeolite runner 5, a chimney 6, a first desorption fan 7, a cooler 8, a second desorption fan 9, a first heater 11 and a second heater 12, wherein one end of the surface cooling filter 1 is connected with an exhaust gas inlet pipe 14, and the other end of the surface cooling filter 1 is connected with one end of the adsorption fan 2 through a pipeline.
Each activated carbon adsorption bed 3 is provided with an adsorption inlet 31, an adsorption outlet 32, a desorption inlet 33 and a desorption outlet 34, each adsorption inlet 31 is respectively communicated with the other end of the adsorption fan 2 through a pipeline, each adsorption outlet 32 is respectively communicated with one end of the dry filter 4 through a pipeline, the other end of the dry filter 4 is communicated with the inlet of the adsorption zone 51 of the zeolite rotating wheel 5 through a first pipeline 17, the outlet of the adsorption zone 51 is communicated with the chimney 6 through a pipeline, the first pipeline 17 is communicated with the inlet of the cooling zone 53 of the zeolite rotating wheel 5 through a second pipeline 18, the outlet of the cooling zone 53 is communicated with one end of the second heater 12 through a pipeline, the other end of the second heater 12 is communicated with the inlet of the desorption zone 52 of the zeolite rotating wheel 5 through a pipeline, the other end of the second desorption fan 9 is communicated with the inlet pipe 14 through a pipeline, one end of the first fan 7 is connected with the nitrogen inlet pipe 15 through a pipeline, the other end of the first fan 7 is communicated with the other end of the first heater 11 through a pipeline 33, and the other end of the first heater 11 is respectively communicated with the other end of the carbon bed through a pipeline 11.
The bottom of the cooler 8 is connected with a recovery liquid storage tank 13 through a pipeline, an oxygen content analyzer 10 is arranged on a connecting pipeline of the cooler 8 and the first heater 11, and a control valve 16 is arranged on a nitrogen inlet pipe 15.
The main instrument and equipment functions:
1. surface cooling filter: is used for cooling and dedusting the waste gas to be treated, controlling the temperature of the waste gas to be treated to be within 40 ℃ and the content of the particulate matters to be less than 1mg/m 3 The adsorption efficiency and the service life of the activated carbon are ensured;
2. a cooler: the method is used for condensing and recycling the high-concentration organic waste gas desorbed by the activated carbon.
3. And (3) a filter: the device is used for intercepting and filtering impurity particles discharged by the activated carbon adsorption bed so as to protect the service life and the purification efficiency of the rear-end zeolite rotating wheel; the filtering grade of the filter reaches above F9 grade.
4. Zeolite wheel: further absorbing and purifying low-concentration organic waste gas discharged from the activated carbon adsorption bed, and ensuring that the tail gas reaches the standard for emission; the runner system is divided into three areas, namely an adsorption area, a desorption area and a cooling area. The adsorption zone mainly has the function of adsorbing and purifying organic waste gas; the desorption zone mainly has the function of regenerating the molecular sieve after adsorption saturation at high temperature; the cooling zone mainly has the function of cooling the regenerated high-temperature molecular sieve.
5. The oxygen content analyzer monitors the change of the oxygen concentration in the system in real time, and ensures the safe and stable operation of the system.
Working principle:
the whole recovery process can be divided into two parts: the adsorption system, the activated carbon desorption recovery system and the zeolite runner desorption regeneration system;
adsorption system:
the waste gas to be treated firstly cools and removes dust through the surface cooling filter 1, then enters the activated carbon adsorption bed 3 for adsorption and purification through the traction of the adsorption fan 2, and the tail gas discharged after the adsorption of the activated carbon is sent to the molecular sieve rotating wheel for further treatment and then is discharged after reaching the standard through the chimney 6.
The activated carbon adsorption system can be provided with 2 or more than 2 activated carbon adsorption beds 3 according to the air quantity to be treated, and the continuous adsorption-desorption recovery treatment requirements can be met through switching of reversing valves.
Activated carbon desorption recovery system:
after the adsorption of the activated carbon adsorption bed 3 reaches a certain adsorption time, the activated carbon adsorption bed enters a desorption recovery system through the switching of a valve; the adsorption bed is filled with nitrogen with purity more than 99% to replace the gas in the desorption regeneration system before desorption regeneration, so that the oxygen content in the gas phase is reduced, the oxygen content in the desorption system is controlled to be lower than 5%, and the generation of oxidation byproducts in the regeneration process is reduced while the system safety is improved. After replacement, nitrogen in the system forms a circulating hot air flow through the first desorption fan 7 and the first heater 11 to heat and purge the activated carbon adsorption bed 3, organic matters are desorbed from activated carbon at high temperature, most organic components are condensed and recovered along with the nitrogen entering the cooler 8, uncondensed gas is heated to the required desorption temperature through the first heater 11 and then continuously purges the activated carbon adsorption bed 3, so that after a certain period of closed circulation, the organic matters adsorbed by the activated carbon are basically desorbed, and the carbon bed is regenerated.
After the desorption of the carbon bed is completed, the carbon layer is subjected to cooling treatment, so that the temperature of the carbon layer is reduced to normal temperature, and the next cycle of adsorption and use are facilitated.
Zeolite runner desorption regeneration system:
the rotating wheel can continuously and slowly rotate at a speed of 1-6 revolutions per hour according to the treatment amount of the waste gas. VOCs contained in the exhaust gas are intercepted inside the molecular sieve in the adsorption zone 51, and purified clean air is directly discharged to the atmosphere. The rotating wheel continuously rotates to adsorb VOCs, gradually tends to be saturated in adsorption, when the rotating wheel rotates to enter the desorption region 52, the desorption fan provides small air volume gas (about 5% -15% of the treated air volume) at about 180-220 ℃ to continuously purge the rotating wheel region (the desorption region 52) saturated in adsorption, and the VOCs adsorbed in the molecular sieve are desorbed and taken away at high temperature, so that the adsorption capacity of the rotating wheel is recovered. The desorbed rotating wheel rotates to enter the cooling zone 53, and the refrigerant in the cooling zone 53 can be external fresh air or front-end organic waste gas. The cooling air flows through the cooling area 53 after the air quantity is regulated by the valve, and exchanges heat with the molecular sieve in the cooling area 53 to cool the molecular sieve, and the cooled molecular sieve is rotationally sent to the adsorption area 51 to continuously adsorb the organic components.
The desorption zone 52 air volume is derived from the cooling air volume of the cooling zone 53. The cooling air flows through the molecular sieve in the cooling area 53 to be heated initially, and then is heated to 180-220 ℃ by the rear end heater 12 to purge the molecular sieve in the desorption area 52.
The small-air-volume medium-high-concentration waste gas desorbed by the zeolite rotating wheel 5 is sent to the front end pipeline of the adsorption system through the second desorption fan 9, is mixed with the waste gas to be treated, and is adsorbed by the adsorption system to reach the standard for emission.
The concentration of the organic waste gas purged from the desorption zone 52 of the zeolite rotor 5 at high temperature can be adjusted according to the rotor speed. The temperature of the blown off gas is about 60-80 ℃, the total temperature rise is smaller after the blown off gas is mixed with the front-end treated waste gas, and the blown off gas is sent into an adsorption system after being cooled by the surface cooling filter 1.
The process flow of the utility model is completed by a PLC control program system through analysis and processing of detection data such as temperature, pressure, time and the like of the system, and the whole process is automatically controlled.
The examples described above only represent preferred embodiments of the present utility model, which are described in more detail, but the present utility model is not limited to these examples, and it should be noted that it is obvious to those skilled in the art that the present utility model is not limited to these examples. Any modifications thereof fall within the scope of the present utility model without departing from the spirit of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.
Claims (4)
1. The safe and efficient organic solvent recycling device is characterized by comprising a surface cooling filter (1), an adsorption fan (2), more than two activated carbon adsorption beds (3), a dry filter (4), a zeolite rotating wheel (5), a chimney (6), a first desorption fan (7), a cooler (8), a second desorption fan (9), a first heater (11) and a second heater (12), wherein one end of the surface cooling filter (1) is connected with an exhaust gas inlet pipe (14), and the other end of the surface cooling filter (1) is connected with one end of the adsorption fan (2) through a pipeline;
each activated carbon adsorption bed (3) is provided with an adsorption inlet (31), an adsorption outlet (32), a desorption inlet (33) and a desorption outlet (34), each adsorption inlet (31) is respectively connected with the other end of the adsorption fan (2) through a pipeline, each adsorption outlet (32) is respectively connected with one end of the dry filter (4) through a pipeline, the other end of the dry filter (4) is connected with the inlet of the adsorption zone (51) of the zeolite rotating wheel (5) through a first pipeline (17), the outlet of the adsorption zone (51) is connected with the chimney (6) through a pipeline, the first pipeline (17) is connected with the inlet of the cooling zone (53) of the zeolite rotating wheel (5) through a second pipeline (18), the outlet of the cooling zone (53) is connected with one end of the second heater (12) through a pipeline, the other end of the second heater (12) is connected with the inlet of the desorption zone (52) of the zeolite rotating wheel (5) through a pipeline, the outlet of the desorption zone (52) is connected with the second fan (9) through a desorption tube (9) through a second pipeline (9), the other end of the cooling zone (53) is connected with the nitrogen gas (9) through a desorption tube (9), the desorption inlet (33) of each activated carbon adsorption bed (3) is respectively connected with the other end of the first heater (11) through a pipeline, and each desorption outlet (34) is respectively communicated with the nitrogen inlet pipe (15) through a pipeline.
2. The safe and efficient organic solvent recovery processing device according to claim 1, wherein the bottom of the cooler (8) is connected with a recovery liquid storage tank (13) through a pipeline.
3. The safe and efficient organic solvent recovery processing device according to claim 1, wherein an oxygen content analyzer (10) is arranged on a connecting pipeline of the cooler (8) and the first heater (11).
4. A safe and efficient organic solvent recovery processing device according to claim 1, characterized in that a control valve (16) is provided on the nitrogen inlet pipe (15).
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| CN202321203541.5U CN219897572U (en) | 2023-05-18 | 2023-05-18 | Safe and efficient organic solvent recycling device |
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| CN202321203541.5U CN219897572U (en) | 2023-05-18 | 2023-05-18 | Safe and efficient organic solvent recycling device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118807403A (en) * | 2024-09-18 | 2024-10-22 | 福建浩氧环保有限公司 | Energy-saving and efficient high-concentration organic waste gas treatment system and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118807403A (en) * | 2024-09-18 | 2024-10-22 | 福建浩氧环保有限公司 | Energy-saving and efficient high-concentration organic waste gas treatment system and method |
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