Nitrogen desorption adsorption recovery device for efficiently recovering organic waste gas

Abstract

The utility model provides a nitrogen desorption adsorption recovery device for efficiently recovering organic waste gas. A vacuumizing pipeline with a vacuum pump is arranged on the left side of the top of an activated carbon adsorber; a nitrogen injection pipeline with a first circulating fan is arranged on the right lower side of the activated carbon adsorber and is connected with a nitrogen generator; a circulating heating pipeline with a second circulating fan is arranged on the right upper side of the activated carbon adsorber, and forms a heating desorption circulating channel with the heater and the nitrogen injection pipeline; a recovery pipeline with a third circulating fan is arranged on the upper left side of the activated carbon adsorber, and the recovery pipeline, the gas heat exchanger and the condenser form a recovery pipeline channel. According to the utility model, the air in the activated carbon adsorber is firstly evacuated, then nitrogen is injected until the pressure is balanced, then the nitrogen is heated to realize cyclic desorption, the desorbed gas is condensed and recycled, the whole desorption process is carried out in an oxygen-free environment in a normal pressure state, the equipment can operate safely and normally, and meanwhile, the quality of a recycled solvent is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of recovery and treatment of organic solvents, in particular to an adsorption recovery device for efficiently recovering organic waste gas by nitrogen desorption. Background Art

[0002] The recovery and treatment of organic solvents has become an important part of industrial production. Conventional solvent recovery devices use steam desorption technology, which will produce condensed wastewater, especially water-soluble organic solvents. A large amount of acidic water containing organic matter will be discharged, which will cause secondary pollution. In addition, the adsorption material activated carbon is repeatedly corroded by condensed water during the desorption process, causing the microporous surface of the activated carbon to be calcified by scale, affecting the adsorption efficiency and shortening the service life of the activated carbon. The nitrogen desorption technology overcomes the disadvantages of secondary pollution of wastewater. For this reason, we propose an adsorption recovery device for efficient recovery of organic waste gas using nitrogen desorption. Utility Model Content

[0003] In order to solve the above-mentioned deficiencies of the prior art, the purpose of the utility model is to provide an adsorption recovery device for efficiently recovering organic waste gas by nitrogen desorption, so as to overcome the defects in the prior art.

[0004] In order to achieve the above-mentioned purpose, the utility model provides an adsorption recovery device for efficiently recovering organic waste gas by nitrogen desorption, the adsorption recovery device comprising an activated carbon adsorber; wherein an air intake pipeline is provided on the lower left side of the activated carbon adsorber to be connected with the organic waste gas pipeline; an exhaust pipeline is provided on the top right side of the activated carbon adsorber, and the exhaust pipeline is connected with the chimney to discharge the clean gas after adsorption; a vacuum pump is provided on the top left side of the activated carbon adsorber, and a vacuum pump is provided on the vacuum pump pipeline to evacuate the air in the activated carbon adsorber; a nitrogen injection pipeline is provided on the lower right side of the activated carbon adsorber, the nitrogen injection pipeline is connected with a nitrogen generator, and a first circulation fan is provided on the nitrogen injection pipeline, so that the nitrogen generated by the nitrogen generator is injected into the activated carbon adsorber through the nitrogen injection pipeline under the drive of the first circulation fan; a circulation heating pipeline is provided on the upper right side of the activated carbon adsorber, and the circulation heating pipeline is connected with the inlet of the heater, and the heating The outlet of the heat collector is connected to the nitrogen injection pipeline between the first circulation fan and the nitrogen generator through a connecting pipeline. A second circulation fan is arranged on the circulation heating pipeline, so that the gas in the activated carbon adsorber is heated by the heater through the circulation heating pipeline under the drive of the second circulation fan, and then returns to the activated carbon adsorber through the nitrogen injection pipeline to form a heating and desorption cycle; a recovery pipeline is arranged on the upper left side of the activated carbon adsorber, the recovery pipeline is connected to the gas heat exchanger, the gas heat exchanger is connected to the condenser through a pipeline, the condenser is respectively connected to the solvent temporary storage tank and the activated carbon adsorber through pipelines, and a third circulation fan is arranged on the recovery pipeline, so that the solvent gas desorbed from the activated carbon adsorber enters the gas heat exchanger for cooling through the recovery pipeline under the drive of the third circulation fan, and then enters the condenser for condensation, the condensed solvent enters the solvent temporary storage tank, and the nitrogen and the solvent-containing gas that has not been desorbed re-enter the activated carbon adsorber.

[0005] Through the above technical scheme, a vacuuming pipeline with a vacuum pump is provided on the left side of the top of the activated carbon adsorber to evacuate the air in the activated carbon adsorber. A nitrogen injection pipeline with a first circulation fan is provided on the lower right side of the activated carbon adsorber, and the nitrogen injection pipeline is connected to the nitrogen generator to inject nitrogen into the activated carbon adsorber. A circulating heating pipeline with a second circulation fan is provided on the upper right side of the activated carbon adsorber, and a heating and desorption circulation channel is formed with the heater and the nitrogen injection pipeline to heat the gas in the activated carbon adsorber. A recovery pipeline with a third circulation fan is provided on the upper left side of the activated carbon adsorber, and a recovery pipeline channel is formed with the gas heat exchanger and the condenser to recover the organic solvent. By first evacuating the air in the activated carbon adsorber, then injecting nitrogen to balance the pressure, and then cyclically heating the nitrogen to achieve cyclic desorption, the desorbed gas can be condensed and recovered, and the entire desorption process is carried out in an oxygen-free environment under normal pressure, ensuring that the equipment can operate safely and normally, while ensuring the quality of the recovered solvent.

[0006] As a further explanation of the adsorption recovery device for efficient recovery of organic waste gas by nitrogen desorption described in the utility model, preferably, a VOC organic gas analyzer is provided on the exhaust pipe to detect the solvent concentration content in the exhaust gas, so that the vacuum pump is started when the solvent concentration content in the exhaust gas reaches a set value.

[0007] Through the above technical solution, when the VOC organic gas analyzer detects that the solvent concentration in the exhaust gas reaches the set value, the activated carbon in the activated carbon adsorber reaches the adsorption saturation state, and the vacuum pump can be started to achieve the purpose of switching the activated carbon adsorber from the adsorption state to the desorption state.

[0008] As a further explanation of the adsorption and recovery device for efficient recovery of organic waste gas by nitrogen desorption described in the utility model, preferably, a pressure sensor is provided in the activated carbon adsorber to detect the pressure inside the activated carbon adsorber, so that when the pressure inside the activated carbon adsorber reaches below -0.03mPa, the first circulation fan and the nitrogen generator are started to start injecting nitrogen; when the pressure inside the activated carbon adsorber returns to balance, the second circulation fan and the heater are started to heat the activated carbon adsorber.

[0009] Through the above technical solution, when the vacuum pump is evacuating the air in the activated carbon adsorber, the pressure sensor starts to detect the pressure in the activated carbon adsorber. When it is detected that the pressure in the activated carbon adsorber reaches below -0.03mPa, the first circulation fan and the nitrogen generator are started to inject nitrogen until the pressure in the activated carbon adsorber is restored to balance, ensuring that the activated carbon adsorber is an oxygen-free environment at normal pressure. When the pressure sensor detects that the pressure in the activated carbon adsorber is restored to balance, the second circulation fan and the heater are started to heat the gas in the activated carbon adsorber to ensure that the equipment can operate safely and normally.

[0010] As a further explanation of the adsorption and recovery device for efficiently recovering organic waste gas by nitrogen desorption described in the utility model, preferably, an oxygen content analyzer is provided in the activated carbon adsorber to detect the oxygen content in the activated carbon adsorber, so that when the oxygen content of the gas in the activated carbon adsorber is greater than 2%, the nitrogen generator is started to automatically replenish nitrogen.

[0011] Through the above technical solution, when the oxygen content analyzer detects that the oxygen content of the gas in the activated carbon adsorber is greater than 2%, the nitrogen generator is started to automatically replenish nitrogen, thereby achieving the purpose of controlling the oxygen content in the activated carbon adsorber to be within the set range, thereby ensuring the quality of the recovered solvent and the safe and normal operation of the equipment.

[0012] As a further explanation of the adsorption recovery device for efficient recovery of organic waste gas by nitrogen desorption described in the utility model, preferably, a temperature sensor is provided in the heater to detect the heating temperature, so that when the temperature of the gas heated by the heater reaches 200°C, the first circulation fan is started to blow the heated gas into the activated carbon adsorber.

[0013] Through the above technical solution, when the temperature sensor detects that the heating temperature of the gas reaches 200°C, the first circulation fan is started to blow the heated gas into the activated carbon adsorber to ensure the desorption temperature in the activated carbon adsorber and improve the desorption efficiency.

[0014] As a further description of the adsorption recovery device for efficient recovery of organic waste gas by nitrogen desorption of the utility model, preferably, the heater is a thermal oil heater, which is used to heat the gas in the activated carbon adsorber discharged by the second circulation fan to 200°C.

[0015] Through the above technical solution, the heating temperature of the heater is 200°C to ensure the desorption temperature in the activated carbon adsorber and improve the desorption efficiency.

[0016] As a further explanation of the adsorption recovery device for efficient recovery of organic waste gas by nitrogen desorption described in the utility model, preferably, a pretreatment device is connected between the air inlet pipeline of the activated carbon adsorber and the organic waste gas pipeline, which is used to filter the organic waste gas through impurities and cool it to a suitable temperature before sending it into the activated carbon adsorber.

[0017] Through the above technical solution, the pretreatment device filters the organic waste gas through impurities and cools it to a suitable temperature before sending it into the activated carbon adsorber 1 to reduce the impact on the adsorption effect of the activated carbon.

[0018] The beneficial effects of the utility model are as follows:

[0019] The utility model is an adsorption recovery device for efficient recovery of organic waste gas by nitrogen desorption. It adopts nitrogen desorption technology. It first evacuates the air in the activated carbon adsorber, then injects nitrogen to balance the pressure, and then circulates and heats the nitrogen to achieve cyclic desorption. The desorbed gas can be condensed and recovered. The entire desorption process is carried out in an oxygen-free environment at normal pressure, ensuring that the equipment can operate safely and normally, while ensuring the quality of the recovered solvent. It has the advantages of high efficiency, environmental protection, and energy saving, and can achieve the treatment of organic waste gas and efficient recovery and resource utilization of organic solvents. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of an adsorption recovery device for efficiently recovering organic waste gas by nitrogen desorption according to the utility model.

[0021] In the figure: activated carbon adsorber 1, air intake pipeline 11, exhaust pipeline 12, vacuum pipeline 13, vacuum pump 14, nitrogen injection pipeline 15, first circulation fan 16, circulation heating pipeline 17, second circulation fan 18, recovery pipeline 19, third circulation fan 110, nitrogen generator 2, heater 3, gas heat exchanger 4, condenser 5, solvent temporary storage tank 6, VOC organic gas analyzer 7, pressure sensor 8, oxygen content analyzer 9, temperature sensor 10. DETAILED DESCRIPTION

[0022] In order to further understand the structure, features and other purposes of the present invention, the preferred embodiments are described in detail with reference to the accompanying drawings as follows. The embodiments described in the drawings are only used to illustrate the technical solution of the present invention and are not intended to limit the present invention.

[0023] In the first embodiment of the present invention, Figure 1 As shown, an adsorption recovery device for efficiently recovering organic waste gas by nitrogen desorption includes an activated carbon adsorber 1, a nitrogen generator 2, a heater 3, a gas heat exchanger 4, a condenser 5 and a solvent temporary storage tank 6.

[0024] An air intake pipe 11 is provided on the lower left side of the activated carbon adsorber 1 to communicate with the organic waste gas pipeline. An exhaust pipe 12 is provided on the top right side of the activated carbon adsorber 1, and the exhaust pipe 12 is connected to the chimney to discharge the clean gas after adsorption. After the organic waste gas is adsorbed by the activated carbon in the activated carbon adsorber 1, the clean gas is discharged into the atmosphere through the chimney.

[0025] A vacuum line 13 is provided on the left side of the top of the activated carbon adsorber 1, and a vacuum pump 14 is provided on the vacuum line 13 to evacuate the air in the activated carbon adsorber 1. After the activated carbon in the activated carbon adsorber 1 is saturated with adsorption, the activated carbon adsorber 1 switches from the adsorption state to the desorption state. To ensure the safety of desorption, the air in the activated carbon adsorber 1 and all the pipelines is evacuated by the vacuum pump 14, thereby ensuring that the activated carbon adsorber 1 is an oxygen-free environment.

[0026] A nitrogen injection pipeline 15 is provided at the lower right side of the activated carbon adsorber 1, and the nitrogen injection pipeline 15 is connected to the nitrogen generator 2. A first circulation fan 16 is provided on the nitrogen injection pipeline 15. The nitrogen generated by the nitrogen generator 2 is injected into the activated carbon adsorber 1 through the nitrogen injection pipeline 15 under the drive of the first circulation fan 16. The pressure of the activated carbon adsorber 1 is balanced when the nitrogen is injected, thereby ensuring that the activated carbon adsorber 1 is in a normal pressure state.

[0027] A circulating heating pipeline 17 is provided on the upper right side of the activated carbon adsorber 1. The circulating heating pipeline 17 is connected to the inlet of the heater 3. The outlet of the heater 3 is connected to the nitrogen injection pipeline 15 between the first circulating fan 16 and the nitrogen generator 2 through a connecting pipeline. A second circulating fan 18 is provided on the circulating heating pipeline 17. Driven by the second circulating fan 18, the gas in the activated carbon adsorber 1 is heated by the heater 3 through the circulating heating pipeline 17, and then returns to the activated carbon adsorber 1 through the nitrogen injection pipeline 15, forming a heating and desorption cycle, thereby ensuring the nitrogen desorption temperature and improving the desorption efficiency.

[0028] A recovery pipeline 19 is provided on the upper left side of the activated carbon adsorber 1. The recovery pipeline 19 is connected to the gas heat exchanger 4. The gas heat exchanger 4 is connected to the condenser 5 through a pipeline. The condenser 5 is respectively connected to the solvent temporary storage tank 6 and the activated carbon adsorber 1 through pipelines. A third circulation fan 110 is provided on the recovery pipeline 19. The solvent gas desorbed from the activated carbon adsorber 1 first enters the gas heat exchanger 4 for cooling through the recovery pipeline 19 under the drive of the third circulation fan 110, and then enters the condenser 5 for condensation. The condensed solvent enters the solvent temporary storage tank 6, and the nitrogen and the solvent-containing gas that has not been desorbed re-enter the activated carbon adsorber 1. The low-concentration solvent gas after adsorption is heated by the gas entering the heater 3, and thus circulates until all the solvent is desorbed.

[0029] The utility model adopts nitrogen desorption technology to efficiently recover organic waste gas. The air in the activated carbon adsorber is evacuated first, and then nitrogen is injected to balance the pressure. Then, the nitrogen is circulated and heated to achieve cyclic desorption. The desorbed gas can be condensed and recovered. The entire desorption process is carried out in an oxygen-free environment at normal pressure to ensure that the equipment can operate safely and normally, and at the same time, the quality of the recovered solvent is guaranteed. It also avoids the generation of condensed water, thereby avoiding the repeated erosion of the adsorption material activated carbon by condensed water during the desorption process, and avoiding the generation of a large amount of acidic wastewater containing organic substances. It has the advantages of high efficiency, environmental protection, and energy saving, and can achieve the treatment of organic waste gas and the efficient recovery and resource utilization of organic solvents.

[0030] In the second embodiment of the present invention, Figure 1 As shown, a VOC organic gas analyzer 7 is provided on the exhaust pipe 12. The VOC organic gas analyzer 7 is used to detect the solvent concentration in the exhaust gas. When the VOC organic gas analyzer 7 detects that the solvent concentration in the exhaust gas reaches a set value, the activated carbon in the activated carbon adsorber 1 reaches an adsorption saturation state, and the vacuum pump 14 can be started to switch the activated carbon adsorber 1 from an adsorption state to a desorption state.

[0031] In the third embodiment of the present utility model, as Figure 1As shown, a pressure sensor 8 is provided in the activated carbon adsorber 1. The pressure sensor 8 is used to detect the pressure in the activated carbon adsorber 1. In the present embodiment, the pressure sensor 8 is inserted at the top of the activated carbon adsorber 1. During the process of the vacuum pump 14 evacuating the air in the activated carbon adsorber 1, the pressure sensor 8 starts to detect the pressure in the activated carbon adsorber 1. When it is detected that the pressure in the activated carbon adsorber 1 reaches below -0.03 mPa, the first circulation fan 16 and the nitrogen generator 2 are started to inject nitrogen until the pressure in the activated carbon adsorber 1 is restored to balance, thereby ensuring that the activated carbon adsorber 1 is an oxygen-free environment at normal pressure. When the pressure sensor 8 detects that the pressure in the activated carbon adsorber 1 is restored to balance, the second circulation fan 18 and the heater 3 are started to heat the gas in the activated carbon adsorber 1 to ensure that the equipment can operate safely and normally.

[0032] In the fourth embodiment of the present invention, Figure 1 As shown, an oxygen content analyzer 9 is provided in the activated carbon adsorber 1. The oxygen content analyzer 9 is used to detect the oxygen content in the activated carbon adsorber 1. When the oxygen content analyzer 9 detects that the oxygen content of the gas in the activated carbon adsorber 1 is greater than 2%, the nitrogen generator 2 is started to automatically supply nitrogen, so as to achieve the purpose of controlling the oxygen content in the activated carbon adsorber 1 to be within the set range, thereby ensuring the quality of the recovered solvent and the safe and normal operation of the equipment.

[0033] In the fifth embodiment of the present utility model, as Figure 1 As shown, a temperature sensor 10 is provided in the heater 3. The temperature sensor 10 is used to detect the heating temperature of the gas heated by the heater 3. When the temperature sensor 10 detects that the heating temperature of the gas reaches 200°C, the first circulation fan 16 is started to blow the heated gas into the activated carbon adsorber 1 to ensure the desorption temperature in the activated carbon adsorber 1 and improve the desorption efficiency.

[0034] In the sixth embodiment of the present invention, preferably, the heater 3 is a thermal oil heater, which is used to heat the gas in the activated carbon adsorber 1 discharged by the second circulation fan 18 to 200°C.

[0035] In the sixth embodiment of the present utility model, a pretreatment device is connected between the air intake pipe 11 of the activated carbon adsorber 1 and the organic waste gas pipeline. The pretreatment device is used to filter the organic waste gas through impurities and cool it to a suitable temperature before sending it into the activated carbon adsorber 1 to reduce the impact on the activated carbon adsorption effect.

[0036] It should be stated that the content and specific implementation methods of the above utility model are intended to demonstrate the practical application of the technical solution provided by the utility model, and should not be interpreted as limiting the scope of protection of the utility model. Those skilled in the art can make various modifications, equivalent substitutions or improvements within the spirit and principle of the utility model. The scope of protection of the utility model shall be subject to the attached claims.

Claims

1. An adsorption recovery device for efficiently recovering organic waste gas by nitrogen desorption, characterized in that: The adsorption recovery device comprises an activated carbon adsorber (1); wherein: An air intake pipeline (11) is provided on the lower left side of the activated carbon adsorber (1) to be connected to the organic waste gas pipeline; an exhaust pipeline (12) is provided on the top right side of the activated carbon adsorber (1), and the exhaust pipeline (12) is connected to the chimney to discharge the clean gas after adsorption; A vacuum pump (13) is provided on the left side of the top of the activated carbon adsorber (1), and a vacuum pump (14) is provided on the vacuum pump (13) to evacuate the air in the activated carbon adsorber (1); A nitrogen injection pipeline (15) is provided on the lower right side of the activated carbon adsorber (1), the nitrogen injection pipeline (15) is connected to the nitrogen generator (2), and a first circulation fan (16) is provided on the nitrogen injection pipeline (15), so that the nitrogen generated by the nitrogen generator (2) is injected into the activated carbon adsorber (1) through the nitrogen injection pipeline (15) under the drive of the first circulation fan (16); A circulating heating pipeline (17) is provided on the upper right side of the activated carbon adsorber (1), the circulating heating pipeline (17) is connected to the inlet of the heater (3), the outlet of the heater (3) is connected to the nitrogen injection pipeline (15) between the first circulating fan (16) and the nitrogen generator (2) through a connecting pipeline, and a second circulating fan (18) is provided on the circulating heating pipeline (17), so that the gas in the activated carbon adsorber (1) is driven by the second circulating fan (18) to pass through the circulating heating pipeline (17) and the heater (3) to be heated, and then return to the activated carbon adsorber (1) through the nitrogen injection pipeline (15), thereby forming a heating and desorption cycle; A recovery pipeline (19) is provided on the upper left side of the activated carbon adsorber (1), the recovery pipeline (19) being connected to the gas heat exchanger (4), the gas heat exchanger (4) being connected to the condenser (5) through a pipeline, the condenser (5) being connected to the solvent temporary storage tank (6) and the activated carbon adsorber (1) through pipelines respectively, and a third circulation fan (110) is provided on the recovery pipeline (19) so that the solvent gas desorbed from the activated carbon adsorber (1) is driven by the third circulation fan (110) to first enter the gas heat exchanger (4) for cooling through the recovery pipeline (19), and then enter the condenser (5) for condensation, the condensed solvent enters the solvent temporary storage tank (6), and the nitrogen and the solvent-containing gas that has not been desorbed re-enter the activated carbon adsorber (1).

2. The adsorption recovery device for efficiently recovering organic waste gas by nitrogen desorption as claimed in claim 1, characterized in that: A VOC organic gas analyzer (7) is provided on the exhaust pipeline (12) to detect the solvent concentration in the exhaust gas, so that the vacuum pump (14) is started when the solvent concentration in the exhaust gas reaches a set value.

3. The adsorption recovery device for efficiently recovering organic waste gas by nitrogen desorption as claimed in claim 1, characterized in that: A pressure sensor (8) is provided in the activated carbon adsorber (1) to detect the pressure in the activated carbon adsorber (1), so that when the pressure in the activated carbon adsorber (1) reaches below -0.03 mPa, the first circulation fan (16) and the nitrogen generator (2) are started to start injecting nitrogen; when the pressure in the activated carbon adsorber (1) returns to equilibrium, the second circulation fan (18) and the heater (3) are started to heat the activated carbon adsorber (1).

4. The adsorption recovery device for efficiently recovering organic waste gas by nitrogen desorption as claimed in claim 1, characterized in that: An oxygen content analyzer (9) is provided in the activated carbon adsorber (1) to detect the oxygen content in the activated carbon adsorber (1), so that when the oxygen content of the gas in the activated carbon adsorber (1) is greater than 2%, the nitrogen generator (2) is started to automatically supply nitrogen.

5. The adsorption recovery device for efficiently recovering organic waste gas by nitrogen desorption as claimed in claim 1, characterized in that: A temperature sensor (10) is provided in the heater (3) to detect the heating temperature, so that when the temperature of the gas heated by the heater (3) reaches 200° C., the first circulation fan (16) is started to blow the heated gas into the activated carbon adsorber (1).

6. The adsorption recovery device for efficiently recovering organic waste gas by nitrogen desorption as claimed in claim 1, characterized in that: The heater (3) is a thermal oil heater, which is used to heat the gas in the activated carbon adsorber (1) discharged from the second circulation fan (18) to 200°C.

7. The adsorption recovery device for efficiently recovering organic waste gas by nitrogen desorption as claimed in claim 1, characterized in that: A pretreatment device is connected between the air inlet pipeline (11) of the activated carbon adsorber (1) and the organic waste gas pipeline, and is used to filter the organic waste gas for impurities and cool it to a suitable temperature before feeding it into the activated carbon adsorber (1).

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