CN112107956B - Mobile liquid nitrogen sprayer and deep thermal desorption recovery system for adsorbent - Google Patents
Mobile liquid nitrogen sprayer and deep thermal desorption recovery system for adsorbent Download PDFInfo
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- CN112107956B CN112107956B CN201910529006.0A CN201910529006A CN112107956B CN 112107956 B CN112107956 B CN 112107956B CN 201910529006 A CN201910529006 A CN 201910529006A CN 112107956 B CN112107956 B CN 112107956B
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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
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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
- B01D2259/00—Type of treatment
- B01D2259/40—Further details for adsorption processes and devices
- B01D2259/40011—Methods relating to the process cycle in pressure or temperature swing adsorption
- B01D2259/40028—Depressurization
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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
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Abstract
The invention discloses a movable liquid nitrogen sprayer which comprises an adsorbent tank and a liquid nitrogen sprayer, wherein the top of the adsorbent tank is sequentially connected with a high-temperature air extraction device and a heat exchanger, a heating device is connected with the liquid nitrogen sprayer, and a liquid nitrogen inlet of the liquid nitrogen sprayer is connected with a liquid nitrogen storage tank; the bottom of the adsorbent tank is connected to heating equipment, and the heating equipment is also connected with a heat exchanger; the liquid nitrogen sprayer comprises a shell and an inner container; the invention also discloses application of the adsorbent in a deep thermal desorption recovery system of the adsorbent. The invention realizes the rapid thermal regeneration and rapid cooling of the adsorbent and the effective recovery of the gas to be analyzed, prolongs the service life of the adsorbent, reduces the cost of replacing the adsorbent and the cost of treating hazardous waste of enterprises, and is energy-saving, green and environment-friendly.
Description
Technical Field
The invention relates to the technical field of VOCs gas recovery and treatment, in particular to a movable liquid nitrogen sprayer and an adsorbent deep thermal desorption recovery system.
Background
With the development of economy and the increasing progress of urbanization, the pollution problem of Volatile Organic Compounds (VOC) is becoming more serious. Volatile Organic Compounds (VOCs) are mainly from exhaust gas of petrochemical industry, chlorine system organic matters for washing and organic solvent of coating system. The emission of VOCs into the atmosphere can cause a number of health, environmental, safety, and other problems.
Currently, methods for treating VOCs are largely classified into destructive and non-destructive methods. Destructive methods include combustion and catalytic oxidation to convert VOCs to CO 2 And H 2 Non-destructive method of O currently, VOCs gas recovery and treatment methods include adsorption and absorption methods, condensation-adsorption methods, membrane separation methods, low-temperature adsorption and incineration treatment technologies.
Among the above VOCs treatment technique, all will use the adsorbent, because the limitation of adsorbing regeneration means, the adsorbent along with the increase of live time, adsorbent degradation speed can accelerate, leads to adsorbent life to reduce rapidly to need regularly change the adsorbent, frequently change the adsorbent and obviously can improve the cost of enterprises.
Disclosure of Invention
In order to solve the technical problems that the desorption of the adsorbent is incomplete and the degradation speed of the adsorbent is high in the desorption process, the invention discloses a movable liquid nitrogen sprayer and an adsorbent deep thermal desorption recovery system.
In order to realize the purpose, the invention adopts the following technical scheme:
the utility model provides a portable liquid nitrogen spray thrower, includes shell and inner bag, the cavity that shell and inner bag enclose is the vacuum region, and the inner bag top is provided with first drain port, and the packing layer is filled in the well upper portion of inner bag, set up the liquid nitrogen under the packing layer and spray the cover, the upper end that the liquid nitrogen sprayed the cover lets in the pipe with the liquid nitrogen and is linked together, and the upper end of high temperature oil gas spout stretches into the liquid nitrogen and sprays the cover cavity, and the bottom and the high temperature oil gas of high temperature oil gas spout insert the mouth and be connected.
As a further optimization of the invention, a plurality of spray holes are uniformly distributed on the periphery of a high-temperature oil gas spray opening extending into the liquid nitrogen spraying cover, the high-temperature oil gas and the liquid nitrogen carry out primary mixing heat exchange in the liquid nitrogen spraying cover, secondary mixing heat exchange is carried out in the packing layer, and the bottom of the liquid nitrogen sprayer is also provided with a liquid gasoline recovery opening.
As a further optimization of the invention, the upper part of the liquid nitrogen spraying cover is of an inverted cone structure, the lower part of the liquid nitrogen spraying cover is of a cylindrical shape, and the liquid nitrogen spraying cover is internally provided with a primary strengthened oil gas and liquid nitrogen gas mixing device.
Preferably, the outer wall of the housing is provided with a cold insulation vacuum-pumping port, and the cold insulation vacuum-pumping port is communicated with the cavity.
As a further preferred aspect of the present invention, the thermometer is mounted on the outer wall of the housing, and the measuring end of the thermometer extends into the inner container.
As a further optimization of the invention, the packing in the packing layer is composed of pall rings or structured packing, and the secondary intensified oil gas and the liquid nitrogen are fully mixed in the packing layer.
The novel liquid nitrogen sprayer is used, and comprises an adsorbent tank and a liquid nitrogen sprayer, wherein the top of the adsorbent tank is sequentially connected with a high-temperature air extraction device and a heat exchanger, a heating device is connected with the liquid nitrogen sprayer, and a liquid nitrogen access port of the liquid nitrogen sprayer is connected with a liquid nitrogen storage tank; the bottom of the adsorbent tank is connected to a heating device, which is also connected to a heat exchanger via a pipeline.
As a further preferable aspect of the present invention, the high temperature air extraction device, the heating device and the adsorbent tank are connected by a hose, and the connection hose is provided with a first valve and a second valve, respectively.
As a further preferred option of the present invention, the high temperature air extraction device is a high temperature fan or a high temperature vacuum pump air extraction device, and the heating device is an electric heater.
As a further optimization of the invention, the heat exchange equipment adopts a jacketed heat exchanger or a tubular heat exchanger, the heat exchanger needs to be arranged obliquely, and the low point is the outlet end of the inner shell or the tubular heat exchanger, so that condensed liquid can be recovered conveniently.
Another aspect of the invention is the use of a novel liquid nitrogen sparger for deep thermal desorption of adsorbents.
The beneficial effect of the invention is that,
1. the movable liquid nitrogen sprayer is simple in overall structure, can be designed into movable skid-mounted equipment or fixed mounting equipment, can perform deep desorption regeneration on the adsorbent periodically through the equipment, and can thoroughly recover the adsorption performance of the adsorbent, so that the quick thermal regeneration, the quick cooling and the effective recovery of the desorbed gas of the adsorbent are realized;
2. be applied to adsorbent thermal analysis recovery system with this portable liquid nitrogen spray thrower, reduced the adsorbent on the one hand and changed the frequency, reduce the enterprise investment, on the other hand can prolong environment-friendly device's life and result of use.
3. The invention has the characteristics of less overall equipment investment, easy equipment maintenance, less public engineering investment, small installed power and the like.
The invention can realize the periodic deep analysis of the adsorbent, further improve the environmental protection effect of the existing oil gas recovery processing device, effectively prolong the service life of the adsorbent, reduce the cost of replacing the adsorbent by enterprises and the cost of treating hazardous wastes, save energy and protect environment.
Drawings
FIG. 1 is a schematic view of the structure of the present invention;
FIG. 2 is a schematic diagram of an adsorbent thermal desorption recovery system.
Wherein, 1-liquid nitrogen spray thrower; 101-a housing; 102-an inner container; 103-a filler layer; 104-liquid nitrogen spray cover; 105-high temperature oil gas jet; 106-liquid gasoline recycling port; 107-high temperature oil gas access; 108-cold insulation vacuum pumping port; 109-thermometer; 110 — a first discharge; 111-liquid nitrogen inlet; 2-a liquid nitrogen storage tank; 3-a heat exchanger; 4-heating equipment; 5-high temperature air extraction equipment; 6-adsorbent tank; 7-a first valve; 8-a second valve; 9-a third valve; 10-a fourth valve; 11-a fifth valve; 12-a sixth valve; 13-a seventh valve; 14-a second discharge port; 15-flexible pipe.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, a mobile liquid nitrogen sprayer comprises a shell 101 and an inner container 102, and an inner layer and an outer layer of structure, wherein a cavity enclosed by the shell 101 and the inner container 102 is a vacuum area, so as to be convenient for cold insulation, the top of the inner container 102 is provided with a first discharge port 110, and the first discharge port 110 is used for discharging condensed and purified gas out of the liquid nitrogen sprayer 1; the packing layer 103 is filled in the middle upper part of the inner container 102, a liquid nitrogen spraying cover 104 is arranged right below the packing layer 103, the upper end of the liquid nitrogen spraying cover 104 is communicated with a liquid nitrogen inlet pipe, and the liquid nitrogen inlet pipe extends out of the outer part of the shell 101, the upper end of the high-temperature oil gas nozzle 105 extends into the cavity of the liquid nitrogen spraying cover 104, the bottom of the high-temperature oil gas nozzle 105 is connected with the high-temperature oil gas inlet 107, a plurality of spray holes are uniformly distributed on the periphery of a high-temperature oil gas spray nozzle 105 which extends into the liquid nitrogen spraying cover 104, high-temperature oil gas is radially sprayed out from a plurality of radial spray holes, the high-temperature oil gas and the liquid nitrogen carry out primary mixed heat exchange in the liquid nitrogen spraying cover 104, secondary mixed heat exchange is carried out in the packing layer 103, in the liquid nitrogen sprays cover 104, high temperature high concentration's oil gas is the liquid by the condensation, and liquid stores up in liquid nitrogen spray thrower 1 bottom, and liquid petrol recovery mouth 106 has still been seted up to liquid nitrogen spray thrower 1 bottom, and the liquid that stores up is discharged liquid nitrogen spray thrower 1 through liquid petrol recovery mouth 106.
Particularly, the upper part of the liquid nitrogen spraying cover 104 is of an inverted cone structure, the lower part of the liquid nitrogen spraying cover 104 is cylindrical, liquid nitrogen gas is sprayed downwards and radially from the liquid nitrogen spraying cover 104, and one-time mixing of the enhanced oil gas and the liquid nitrogen gas is completed in the liquid nitrogen spraying cover 104.
Particularly, a cold insulation vacuumizing port 108 is formed in the outer wall of the shell 101, the cold insulation vacuumizing port 108 is communicated with the cavity, and the purpose of vacuumizing the cavity formed by the shell 101 and the liner 102 can be achieved by connecting a vacuum pump.
Specifically, the thermometer 109 is mounted on the outer wall of the housing 101, and the measuring end of the thermometer 109 extends into the inner container 102 to measure the actual temperature in the liquid nitrogen shower 1 at all times.
Particularly, the packing in the packing layer 103 consists of pall rings or structured packing, and the secondary strengthening oil gas and the liquid nitrogen are fully mixed in the packing layer 103.
As shown in fig. 2, the novel liquid nitrogen sprayer 1 is used, and comprises an adsorbent tank 6 and a liquid nitrogen sprayer 1, wherein the top of the adsorbent tank 6 is sequentially connected with a high-temperature air extraction device 5 and a heat exchanger 3, a heating device 4 is connected with the liquid nitrogen sprayer 1, and a liquid nitrogen inlet 111 of the liquid nitrogen sprayer 1 is connected with a liquid nitrogen storage tank 2; the bottom of the adsorbent tank 6 is connected to a heating device 4, and the heating device 4 is also connected to the heat exchanger 3 through a pipeline.
Particularly, the high-temperature air extraction device 5, the heating device 4 and the adsorbent tank 6 are connected through a hose 15, the connecting hose 15 is respectively provided with a first valve 7 and a second valve 8, a pipeline for connecting the heating device 4 and the heat exchanger 3 is provided with a third valve 9 and a fourth valve 10, a pipeline for connecting the heating device 4 and the second discharge port 14 is also provided with a fifth valve 11 and a sixth valve 12, and a connecting pipeline for connecting the liquid nitrogen sprayer 1 and the liquid nitrogen storage tank 2 is provided with a seventh valve 13.
Particularly, the high-temperature air extraction equipment 5 is high-temperature fan or high-temperature vacuum pump air extraction equipment, and the heating equipment 4 is an electric heater.
Particularly, the heat exchange equipment adopts a jacketed heat exchanger or a tubular heat exchanger, the heat exchanger 3 needs to be arranged obliquely, and the low point is the outlet end of the inner shell or the tubular heat exchanger, so that condensed liquid is convenient to recycle.
In the system, high-concentration oil gas after thermal analysis is connected into a liquid nitrogen sprayer 1 through a high-temperature oil gas inlet 107, and is effectively mixed with liquid nitrogen gas connected into a liquid nitrogen inlet 111 in a liquid nitrogen spraying cover 104 for the first time, and then secondary full mixing is completed in a packing layer 103 above the spraying cover.
Example 1
Portable liquid nitrogen spray thrower is applied to thermal analysis recovery system of adsorbent, and the recovery process includes:
1) adsorbent vacuum desorption and closed inerting process of circulating system
The first valve 7, the fourth valve 10, the sixth valve 12 and the seventh valve 13 are in an open state, other valves are in a closed state, the high-temperature air extraction device 5 is opened, so that the adsorbent tank 6, the heating device 4 and a connecting pipeline thereof are in a vacuum state, then the first valve 7 is closed, nitrogen or other inert gases are supplemented to be recovered to normal pressure, most of high-concentration oil gas is analyzed from adsorbent pores in the vacuum analysis process, the discharged high-concentration normal-temperature oil gas is sent to the liquid nitrogen sprayer 1, the high-concentration normal-temperature oil gas and liquid nitrogen are fully mixed and recycled in the liquid nitrogen sprayer 1, and the gas after condensation and purification is discharged through the first discharge port 110.
2) Thermal desorption of adsorbent
The first valve 7, the third valve 9 and the seventh valve 13 are in an open state, the other valves are in a closed state, the high-temperature air extraction device 5 and the heating device 4 are opened, power circulating gas is provided by the high-temperature air extraction device 5, heat energy is provided by the heating device 4, residual adsorbates in the adsorbent are thoroughly analyzed under the heating action of high-temperature flowing gas, high-temperature inert gas or nitrogen continuously circulates in the circulation loop for a certain time until the analysis of the adsorbent is thoroughly realized, and whether the thermal analysis process is completed or not can be judged through that the oil-gas concentration in the circulation pipeline does not increase along with the temperature any more;
3) cold recovery process of adsorbate
The first valve 7, the fourth valve 10, the fifth valve 11, the sixth valve 12 and the seventh valve 13 are all in an open state, other valves are in a closed state, at this moment, the heating device 4 is in a closed state, the high-temperature air extraction device 5 is in an open state, oil gas after thermal analysis enters the tube pass of the heat exchanger 3 through the high-temperature air extraction device 5 to be subjected to preliminary heat exchange and cooling to realize liquefaction and recovery of part of the oil gas, then the high-temperature oil gas enters the liquid nitrogen sprayer 1, the high-temperature oil gas and the liquid nitrogen gas are subjected to sufficient heat exchange, the oil gas is cooled to about 150 ℃ below zero, standard emission of the oil gas is realized, low-temperature purified gas at the outlet of the liquid nitrogen sprayer 1 returns to the shell pass of the heat exchanger 3 again, one part of gas after the outlet of the shell pass enters the heating device 4 to further cool the electric heater and the adsorbent, and the other part of the gas is exhausted from the second exhaust port 14.
Example 2
The thermal analysis recovery system of adsorbent is applied to portable liquid nitrogen spray thrower, and the recovery process includes:
1) adsorbent vacuum desorption and closed inerting process of circulating system
The first valve 7, the fourth valve 10, the sixth valve 12 and the seventh valve 13 are in an open state, other valves are in a closed state, the high-temperature air extraction device 5 is opened, so that the adsorbent tank 6, the heating device 4 and a connecting pipeline thereof are in a vacuum state, then the first valve 7 is closed, nitrogen or other inert gases are supplemented to be recovered to normal pressure, most of high-concentration oil gas is analyzed from adsorbent pores in the vacuum analysis process, the discharged high-concentration normal-temperature oil gas is sent to the liquid nitrogen sprayer 1, the high-concentration normal-temperature oil gas and liquid nitrogen are fully mixed and recycled in the liquid nitrogen sprayer 1, and the gas after condensation and purification is discharged through the first discharge port 110.
2) Thermal desorption of adsorbent
The first valve 7, the third valve 9 and the seventh valve 13 are in an open state, the other valves are in a closed state, the high-temperature air extraction device 5 and the heating device 4 are opened, the high-temperature air extraction device 5 provides power circulating gas, the heating device 4 provides heat energy, residual adsorbates in the adsorbent are thoroughly analyzed under the heating action of high-temperature flowing gas, high-temperature inert gas or nitrogen continuously circulates in the circulating loop for a certain time until the analysis of the adsorbent is thoroughly realized, and whether the thermal analysis process is completed or not can be judged through the oil-gas concentration in the circulating pipeline which is not increased along with the temperature;
3) cold recovery process of adsorbate
The first valve 7, the fourth valve 10, the fifth valve 11, the sixth valve 12 and the seventh valve 13 of the valves are all in an open state, other valves are in a closed state, at this moment, the heating device 4 is in a closed state, the high-temperature air extraction device 5 is in an open state, the oil gas after thermal analysis enters the tube pass of the heat exchanger 3 through the high-temperature air extraction device 5 to be subjected to preliminary heat exchange and temperature reduction to realize liquefaction and recovery of part of the oil gas, then the high-temperature oil gas enters the liquid nitrogen sprayer 1, the high-temperature oil gas and the liquid nitrogen gas are subjected to sufficient heat exchange, the oil gas is cooled to about-140 ℃, and standard emission of the oil gas is realized, low-temperature purified gas at the outlet of the liquid nitrogen sprayer 1 returns to the shell pass of the heat exchanger 3 again, one part of the gas after the outlet of the shell pass enters the heating device 4, so as to further cool the temperature of the electric heater and the temperature of the adsorbent, and the other part of the gas is exhausted by the second exhaust port 14.
Example 3
The thermal analysis recovery system of adsorbent is applied to portable liquid nitrogen spray thrower, and the recovery process includes:
1) adsorbent vacuum desorption and closed inerting process of circulating system
The first valve 7, the fourth valve 10, the sixth valve 12 and the seventh valve 13 are in an open state, other valves are in a closed state, the high-temperature air extraction device 5 is opened, the adsorbent tank 6, the heating device 4 and connecting pipelines thereof are in a vacuum state, then the first valve 7 is closed, nitrogen or other inert gases are supplemented to return to normal pressure, most of high-concentration oil gas is analyzed from adsorbent pores in the vacuum analysis process, the discharged high-concentration normal-temperature oil gas is sent into the liquid nitrogen sprayer 1, the oil gas and the liquid nitrogen are fully mixed and recycled in the liquid nitrogen sprayer 1, and the gas after condensation purification is discharged through the first discharge port 110.
2) Thermal desorption of adsorbent
The first valve 7, the third valve 9 and the seventh valve 13 are in an open state, the other valves are in a closed state, the high-temperature air extraction device 5 and the heating device 4 are opened, the high-temperature air extraction device 5 provides power circulating gas, the heating device 4 provides heat energy, residual adsorbates in the adsorbent are thoroughly analyzed under the heating action of high-temperature flowing gas, high-temperature inert gas or nitrogen continuously circulates in the circulating loop for a certain time until the analysis of the adsorbent is thoroughly realized, and whether the thermal analysis process is completed or not can be judged through the oil-gas concentration in the circulating pipeline which is not increased along with the temperature;
3) cold recovery process of adsorbate
The first valve 7 of valve, the fourth valve 10, the fifth valve 11, the sixth valve 12, the seventh valve 13 is all in the open mode, other valves are in the closed mode, at this moment, the heating device 4 is in the closed mode, the high-temperature air extraction device 5 is in the open mode, the oil gas after thermal analysis enters the heat exchanger 3 tube side through the high-temperature air extraction device 5 and primarily exchanges heat and cools down to realize the liquefaction recovery of part of oil gas, then the high-temperature oil gas reenters the liquid nitrogen spray thrower 1, the high-temperature oil gas and the liquid nitrogen gas exchange heat fully, the oil gas is cooled to about minus 160 ℃, so that the standard discharge of the oil gas is realized, the low-temperature purified gas at the outlet of the liquid nitrogen spray thrower 1 returns the heat exchanger 3 shell side again, one part of the gas after the shell side outlet enters the heating device 4, so as to further cool the temperature of electric heater and adsorbent, and the other part is evacuated by the second discharge port 14.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make various changes, modifications, additions and substitutions within the spirit and scope of the present invention.
Claims (9)
1. A deep thermal desorption recovery system for an adsorbent is characterized in that a movable liquid nitrogen sprayer is adopted and comprises a shell and an inner container, a cavity enclosed by the shell and the inner container is a vacuum area, a first discharge port is arranged at the top of the inner container, a liquid nitrogen spraying cover is arranged right below a packing layer, the upper end of the liquid nitrogen spraying cover is communicated with a liquid nitrogen inlet pipe, the upper end of a high-temperature oil gas nozzle extends into the cavity of the liquid nitrogen spraying cover, and the bottom of the high-temperature oil gas nozzle is connected with the high-temperature oil gas inlet;
the adsorbent deep thermal desorption recovery system comprises an adsorbent tank and a liquid nitrogen sprayer, wherein the top of the adsorbent tank is sequentially connected with a high-temperature air extraction device and a heat exchanger, a heating device is connected with the liquid nitrogen sprayer, and a liquid nitrogen inlet of the liquid nitrogen sprayer is connected with a liquid nitrogen storage tank; the bottom of the adsorbent tank is connected to heating equipment, and the heating equipment is also connected with a heat exchanger through a pipeline;
the high-temperature air extraction equipment is high-temperature fan or high-temperature vacuum pump air extraction equipment, and the heating equipment is an electric heater;
the recovery process comprises:
1) adsorbent vacuum desorption and closed inerting process of circulating system
The high-temperature air extraction equipment is started, so that the adsorbent tank, the heating equipment and the connecting pipeline thereof are in a vacuum state, nitrogen or other inert gases are supplemented to be recovered to normal pressure, most of high-concentration oil gas is resolved out from pores of the adsorbent in the vacuum resolving process, the discharged high-concentration normal-temperature oil gas is sent into a liquid nitrogen sprayer, is fully mixed with liquid nitrogen in the liquid nitrogen sprayer for recycling, and the condensed and purified gas is discharged through a first discharge port;
2) thermal desorption of adsorbent
The high-temperature air extraction equipment and the heating equipment are started, power cycle gas is provided through the high-temperature air extraction equipment, heat energy is provided through the heating equipment, residual adsorbates in the adsorbent are thoroughly analyzed under the heating action of high-temperature flowing gas, high-temperature inert gas or nitrogen continuously circulates in the circulation loop for a certain time until the analysis of the adsorbent is thoroughly realized, and whether the thermal analysis process is completed or not can be judged through the oil gas concentration in the circulation pipeline which does not increase along with the temperature any more;
3) cold recovery process of adsorbate
Heating equipment is in the closed state, high temperature air exhaust equipment is in the open mode, the oil gas after the thermal analysis passes through high temperature air exhaust equipment and gets into the preliminary heat transfer cooling of heat exchanger tube side and realize the liquefaction recovery of part oil gas, later high temperature oil gas reentrant liquid nitrogen spray thrower, high temperature oil gas and liquid nitrogen gas fully exchange heat, the oil gas is cooled down to-150 ℃, thereby realize the discharge to reach standard of oil gas, the low temperature purification gas of liquid nitrogen spray thrower export then returns the heat exchanger shell side again, partly entering heating equipment by the gas behind the shell side export, thereby further cool off electric heater and adsorbent temperature, another part is then by the evacuation of second discharge port.
2. The deep thermal desorption recovery system of the adsorbent of claim 1, wherein a plurality of spray holes are uniformly distributed on the periphery of the high temperature oil gas spray opening extending into the liquid nitrogen spray cover, the high temperature oil gas and the liquid nitrogen perform primary mixing heat exchange in the liquid nitrogen spray cover, the packing layer performs secondary mixing heat exchange, and the bottom of the liquid nitrogen spray device is further provided with a liquid gasoline recovery opening.
3. The deep thermal desorption recovery system of adsorbent of claim 2, wherein the upper portion of the liquid nitrogen spraying cover is an inverted cone-shaped structure, the lower portion of the liquid nitrogen spraying cover is cylindrical, and the liquid nitrogen spraying cover is internally provided with a primary reinforced oil gas and liquid nitrogen gas mixing device.
4. The deep thermal desorption recovery system of adsorbent of claim 1 wherein the outer wall of said housing is provided with a cold insulation vacuum-pumping port, said cold insulation vacuum-pumping port being in communication with the cavity.
5. The deep thermal desorption recovery system of claim 4 wherein a thermometer is mounted to the outer wall of the housing and a measuring end of the thermometer extends into the inner container.
6. The deep thermal desorption recovery system of adsorbent of claim 1, wherein the packing layer is filled at the middle upper part of the inner container, the packing in the packing layer is composed of pall rings or structured packing, and the secondary intensified oil gas and liquid nitrogen are fully mixed in the packing layer.
7. The deep thermal desorption recovery system for the adsorbent according to claim 1, wherein the high temperature gas extraction device, the heating device and the adsorbent tank are connected through hoses, and the first valve and the second valve are respectively arranged on the hoses.
8. The deep thermal desorption recovery system of the adsorbent according to claim 1, wherein the heat exchanger is a jacketed heat exchanger or a tubular heat exchanger, the heat exchanger is arranged obliquely, and the low point is the outlet end of the inner shell or the tubular heat exchanger, so that condensed liquid can be recovered conveniently.
9. Use of the sorbent deep thermal desorption recovery system of claim 8 for deep thermal desorption of a sorbent.
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| NL126643C (en) * | 1964-10-05 | |||
| GB0015123D0 (en) * | 2000-06-20 | 2000-08-09 | Air Prod & Chem | Process and apparatus for removal of volatile compounds from process gases |
| CN104857735B (en) * | 2015-05-29 | 2017-08-11 | 南京都乐制冷设备有限公司 | A kind of condensation adsorption recovery apparatus of VOCs gases |
| CN206597432U (en) * | 2017-01-23 | 2017-10-31 | 广西威荣环保科技有限公司 | Flue gas of refuse burning cooling and dedusting purifying column |
| CN107008111A (en) * | 2017-05-22 | 2017-08-04 | 朱强 | Organic exhaust gas multistage cold washing condensation recycling and processing device and method |
| CN209530446U (en) * | 2018-12-03 | 2019-10-25 | 成都科瑞尔低温设备有限公司 | A kind of insulation liquid nitrogen spraying gas and oil separating plant |
| CN109499259A (en) * | 2019-01-11 | 2019-03-22 | 吴孟德 | A kind of packed tower and the method using packed tower improvement low-concentration organic exhaust gas |
| CN109847398B (en) * | 2019-03-21 | 2023-08-29 | 厚普清洁能源(集团)股份有限公司 | Liquid nitrogen spraying oil gas recovery device and method |
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