VOC (volatile organic compound) subzero treatment collecting and recycling device

Abstract

The utility model belongs to the field of waste gas VOC (Volatile Organic Compounds) recovery, in particular relates to a VOC subzero treatment collection and recovery device, and aims to solve the problems that in the prior art, after heat exchange is carried out on VOC through liquid nitrogen, gas in a gas state is converted into solid and liquid states, treated gas is discharged, the converted solid and liquid states are collected again, the liquid state is easy to collect at the moment, and the VOC recovery efficiency is low. In order to solve the problem that the treatment efficiency is low due to the fact that the solid state remains in the tank and is difficult to remove, the utility model provides the following scheme that the device comprises a first tank body and a second tank body which are used as containers, a first air inlet end is arranged at the top of the first tank body, and a first exhaust pipe is arranged on one side of the first tank body; through the cooperative use of the first tank body and the second tank body, the energy of waste gas and liquid nitrogen can be fully utilized, the disposal cost and the operation cost are greatly reduced, and the practicability is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of waste gas VOC recovery, in particular to a VOC deep cold treatment collection and recovery device. Background Art

[0002] With the rapid development of industrialization, the emission of volatile organic compounds (VOC) has become increasingly serious, posing a serious threat to the environment and human health. The VOC cryogenic treatment collection and recovery device uses condensation technology to condense organic matter in the exhaust gas into liquid, thereby achieving the goal of recovery and emission reduction.

[0003] The existing VOC cryogenic treatment collection and recovery device has some shortcomings when in use. After the VOC is heat exchanged with liquid nitrogen, the gaseous VOC is converted into solid and liquid states. The treated gas is then discharged and the converted solid and liquid states are collected. At this time, the liquid state is easier to collect, but the solid state will remain in the tank and is difficult to remove. In addition, the energy of the waste and liquid nitrogen cannot be fully utilized, resulting in low processing efficiency and high costs. Utility Model Content

[0004] The purpose of the utility model is to solve the problem in the prior art that after heat exchange with VOC by liquid nitrogen, gaseous VOC will be converted into solid and liquid states, and then the treated gas will be discharged, and the converted solid and liquid states will be collected again. At this time, the liquid state is easier to collect, but the solid state will remain in the tank and is difficult to remove, resulting in low treatment efficiency. A VOC cryogenic treatment collection and recovery device is proposed.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A VOC cryogenic treatment collection and recovery device, comprising a No. 1 tank body and a No. 2 tank body, used as a container, a No. 1 air inlet end is arranged on the top of the No. 1 tank body, a No. 1 exhaust pipe is arranged on one side of the No. 1 tank body, a No. 2 air inlet end is arranged on the top of the No. 2 tank body, a No. 2 exhaust pipe is arranged on one side of the No. 2 tank body, valves are arranged inside the No. 1 air inlet end, the No. 1 exhaust pipe, the No. 2 air inlet end and the No. 2 exhaust pipe, discharge ends are arranged at the bottom of the No. 1 tank body and the No. 2 tank body, the No. 1 tank body and the No. 2 tank body are fixedly connected with the same intercommunication pipe, and a valve is installed in the intercommunication pipe;

[0007] An exhaust pipe, used for conveying exhaust gas, wherein the exhaust pipe is connected to the second air inlet end and the first air inlet end respectively;

[0008] A liquid nitrogen pipe, used for conveying liquid nitrogen, wherein a No. 2 liquid nitrogen conveying pipe is provided on one side of the No. 2 tank body, and a valve is provided inside the No. 2 liquid nitrogen conveying pipe, and a No. 1 liquid nitrogen conveying pipe is provided on one side of the No. 1 tank body, and a valve is provided inside the No. 1 liquid nitrogen conveying pipe, and the No. 2 liquid nitrogen conveying pipe and the No. 1 liquid nitrogen conveying pipe are both connected to one end of the liquid nitrogen pipe;

[0009] The main liquid container is used to collect liquid and solid VOCs, and the main liquid container is arranged below the first tank body and the second tank body.

[0010] In a possible design, the tops of the No. 1 tank body and the No. 2 tank body are both provided with gas discharge pipes, and pressure reducing valves are provided inside the gas discharge pipes.

[0011] In a possible design, the discharge ends of the No. 1 tank body and the No. 2 tank body are connected to the same connecting pipe, one side of the connecting pipe is connected to a collecting pipe, one end of the collecting pipe is connected to an auxiliary pipe, and an auxiliary component is arranged inside the auxiliary pipe.

[0012] In a possible design, the auxiliary component includes a partition and a baffle, the partition is fixedly arranged inside the auxiliary pipe, a No. 2 through hole is opened on the surface of the partition, the baffle is slidably arranged inside the auxiliary pipe and is located below the partition, a No. 1 through hole is opened on the surface of the baffle, and the No. 1 through hole is offset from the No. 2 through hole, a connecting pipe is fixedly connected to the bottom of the auxiliary pipe, and the other end of the connecting pipe is connected to the main liquid container, a connecting rod is fixedly arranged at the bottom of the baffle, and one end of the connecting rod extends to the interior of the main liquid container through the connecting pipe, and a floating plate is fixedly arranged on one end of the connecting rod located inside the main liquid container.

[0013] In a possible design, one side of the auxiliary pipeline is connected to a secondary pipe, and the secondary pipe is located above the partition, and the other end of the secondary pipe is connected to a secondary liquid container.

[0014] In a possible design, the auxiliary component also includes a water immersion alarm, which includes a sensor and an alarm. The sensor is arranged at the bottom of the floating plate, and the alarm is arranged outside the main liquid container. The alarm is electrically connected to the sensor and used in conjunction with it.

[0015] In a possible design, a spacer ring is fixedly provided at the bottom of the floating plate, and the sensor is located inside the spacer ring.

[0016] In the present application, during initial use, high-concentration VOC waste gas is input into the interior of tank No. 2 through the No. 2 air inlet end, and then the waste gas enters the interior of tank No. 1 through the interconnecting pipe. At this time, liquid nitrogen is input into the interior of tank No. 1 through the No. 1 liquid nitrogen delivery pipe for heat exchange, and the gaseous VOC is converted into solid and liquid through heat exchange with VOC by utilizing the low temperature (minus one hundred and ninety degrees) energy of liquid nitrogen. Then the liquid enters the interior of the main liquid container through the connecting pipe. At this time, the condensed solid will remain in the interior of tank No. 1. After the No. 1 tank is saturated with collection, it is switched to turn off the liquid nitrogen, and the waste gas is input into the interior of tank No. 1 through the No. 1 air inlet end. The heat of the waste gas contacts the solid to perform heat exchange to melt the ice, and the melted liquid enters the interior of the main liquid container through the connecting pipe, and the waste gas can also be pre-cooled , then the pre-cooled waste gas is transported into the interior of the No. 2 tank through the interconnecting pipe, and then liquid nitrogen is input into the interior of the No. 2 tank through the No. 2 liquid nitrogen delivery pipe to exchange heat with the waste gas, and the gaseous waste gas is converted into solid and liquid states. The liquid state enters the interior of the main liquid container through the connecting pipe, and the solid state remains in the interior of the No. 2 tank. Then the first step can be repeated to transport the waste gas to the interior of the No. 2 tank through the No. 2 air inlet end. At this time, the VOC condensed into a solid state is melted by the heat of the waste gas, and the waste gas is pre-cooled. After the solid state is melted, it enters the interior of the main liquid container through the connecting pipe for collection, and the pre-cooled waste gas enters the interior of the No. 1 tank through the interconnecting pipe, and a reciprocating cycle is performed. Through the cooperation between the two, the mutual cooperation is achieved, so as to save energy consumption and make full use of energy.

[0017] By utilizing the low temperature (-190 degrees) energy of liquid nitrogen to exchange heat with VOC, gaseous VOC is converted into solid and liquid. The low temperature of -190 degrees is far lower than the freezing point of most gaseous VOC. The VOC removal rate in the waste gas can reach more than 90% through the secondary conversion, so that it meets the standard and is discharged through the No. 1 exhaust pipe or the No. 2 exhaust pipe. The solid and liquid VOCs collected are finally collected into the main liquid container through the connecting pipe;

[0018] When the air pressure under abnormal working conditions reaches the set value, the high pressure opens the air discharge pipe to release the pressure and exhaust the air.

[0019] When the collected VOC liquid enters the interior of the collection pipe through the connecting pipe, it will pass through the No. 2 through hole and the No. 1 through hole through the connecting pipe into the interior of the main liquid container for collection. The floating plate will float on its surface. When the VOC inside the main liquid container is stored to a specified amount, it will touch the sensor, causing it to generate an alarm to remind the staff that it needs to be processed. At this time, the main liquid container still has a certain storage space. When the floating plate gradually rises with the increase in storage capacity, the floating plate will block the No. 2 through the baffle, so that the collected VOC will enter the auxiliary liquid container connected to the auxiliary pipe through the auxiliary pipe for collection, preventing the staff from not cleaning the main liquid container in time and avoiding overflow, thereby achieving a practical effect of helping.

[0020] In the utility model, the VOC cryogenic treatment collection and recovery device can fully utilize the energy of waste gas and liquid nitrogen by using the No. 1 tank body and the No. 2 tank body in combination, and can not only treat the waste gas with liquid nitrogen and discharge it, but also use the heat of the waste gas to melt the ice condensed into solid, which greatly reduces the disposal cost and operation cost and increases the practicality;

[0021] In the utility model, the VOC cryogenic treatment collection and recovery device can achieve the effect that when the main liquid container for storage reaches a specified amount, an alarm will be issued to remind the staff to clean it up, and if it is not cleaned up in time, the collected VOC will enter the auxiliary liquid container for temporary storage;

[0022] In the utility model, when in use, the first tank body and the second tank body are used in coordination, so that the energy of the waste gas and liquid nitrogen can be fully utilized, which greatly reduces the disposal cost and the operation cost and increases the practicality;

[0023] The auxiliary component can be used to make an alarm sound when the main liquid container used for storage reaches a specified amount to remind the staff to clean it up, and even if it is full, the VOC will enter the secondary liquid container for temporary storage. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the main structure of a VOC cryogenic treatment collection and recovery device proposed by the utility model;

[0025] Figure 2 This is a three-dimensional structural schematic diagram of the No. 2 tank of a VOC cryogenic treatment collection and recovery device proposed by the utility model;

[0026] Figure 3 The utility model provides a cross-sectional structural diagram of an auxiliary component of a VOC cryogenic treatment collection and recovery device.

[0027] In the figure: 1. No. 1 tank body; 2. connecting pipe; 3. No. 1 liquid nitrogen delivery pipe; 4. No. 2 air inlet end; 5. No. 2 liquid nitrogen delivery pipe; 6. exhaust pipe; 7. No. 1 exhaust pipe; 8. collecting pipe; 9. auxiliary pipeline; 10. main liquid container; 11. partition; 12. No. 1 through hole; 13. connecting pipe; 14. connecting rod; 15. sensor; 16. floating plate; 17. baffle; 18. auxiliary pipe; 19. unloading pipe; 20. No. 2 through hole; 21. No. 1 air inlet end; 22. No. 2 exhaust pipe; 23. No. 2 tank body; 24. liquid nitrogen pipe; 25. interconnecting pipe. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0029] Example 1

[0030] Reference Figure 1 , a VOC cryogenic treatment collection and recovery device, which is used in the field of waste gas VOC recovery, includes: a No. 1 tank body 1 and a No. 2 tank body 23, both of which are used as containers for cryogenic treatment of VOC. The top of the No. 1 tank body 1 is provided with a No. 1 air inlet 21 for introducing the VOC waste gas to be treated; a No. 1 exhaust pipe 7 is provided on one side of the No. 1 tank body 1 for discharging the treated waste gas. Similarly, the top of the No. 2 tank body 23 is provided with a No. 2 air inlet 4 for introducing waste gas; a No. 2 exhaust pipe 22 is provided on one side of the No. 2 tank body 23 for discharging waste gas. In order to ensure the controllability of the treatment process, valves are provided inside the No. 1 air inlet 21, the No. 1 exhaust pipe 7, the No. 2 air inlet 4 and the No. 2 exhaust pipe 22, so as to adjust the flow and direction of the gas according to actual needs. In addition, the bottoms of the No. 1 tank body 1 and the No. 2 tank body 23 are provided with exhaust ports for discharging treated liquid or solid VOC.

[0031] Reference Figure 1 The exhaust pipe 6 is used to transport the VOC exhaust gas to be treated to the device. It is connected to the second air inlet port 4 and the first air inlet port 21 respectively to ensure that the exhaust gas can smoothly enter the tank for treatment.

[0032] Reference Figure 1 The liquid nitrogen pipe 24 is used to transport liquid nitrogen to provide the necessary cooling medium for cryogenic treatment. A second liquid nitrogen delivery pipe 5 is provided on one side of the second tank body 23, and a first liquid nitrogen delivery pipe 3 is provided on one side of the first tank body 1. Both are connected to one end of the liquid nitrogen pipe 24 to transport liquid nitrogen into the tank body. At the same time, in order to control the flow rate of liquid nitrogen, valves are provided inside the second liquid nitrogen delivery pipe 5 and the first liquid nitrogen delivery pipe 3.

[0033] Reference Figure 1 The main liquid container 10 is located below the No. 1 tank body 1 and the No. 2 tank body 23, and is used to collect liquid or solid VOCs generated during the treatment process to ensure that these harmful substances can be effectively collected and recycled.

[0034] The specific operation method is: during the initial use, high-concentration VOC waste gas is input into the interior of the No. 2 tank body 23 through the No. 2 air inlet end 4, and then the waste gas enters the interior of the No. 1 tank body 1 through the interconnecting pipe 25. At this time, liquid nitrogen is input into the interior of the No. 1 tank body 1 through the No. 1 liquid nitrogen delivery pipe 3 for heat exchange, and the gaseous VOC is converted into a solid and liquid state through heat exchange with the VOC by utilizing the low-temperature energy of liquid nitrogen at minus one hundred and ninety degrees. Then the liquid enters the interior of the main liquid container 10 through the connecting pipe 2. At this time, the condensed solid will remain in the No. 1 tank body 1, and then the waste gas is input into the interior of the No. 1 tank body 1 through the No. 1 air inlet end 21. The heat of the waste gas contacts the solid to exchange heat and melt the ice. The melted liquid enters the interior of the main liquid container 10 through the connecting pipe 2, and the waste gas can also be pre-cooled, and then through the interconnecting pipe. 25 The pre-cooled exhaust gas is introduced into the interior of the No. 2 tank body 23, and then liquid nitrogen is introduced into the interior of the No. 2 tank body 23 through the No. 2 liquid nitrogen delivery pipe 5 to exchange heat with the exhaust gas, and the gaseous exhaust gas is converted into solid and liquid states. The liquid state enters the interior of the main liquid container 10 through the connecting pipe 2, and the solid state remains in the interior of the No. 2 tank body 23. Then the first step can be repeated to introduce the exhaust gas into the interior of the No. 2 tank body 23 through the No. 2 air inlet port 4. At this time, the VOC condensed into a solid state is melted by the heat of the exhaust gas, and the exhaust gas is pre-cooled. After the solid state is melted, it enters the interior of the main liquid container 10 through the connecting pipe 2 for collection, and the pre-cooled exhaust gas enters the interior of the No. 1 tank body 1 through the interconnecting pipe 25. A reciprocating cycle is sufficient. The two cooperate with each other to achieve mutual cooperation, thereby saving energy consumption and making full use of energy.

[0035] The low-content VOC discharged through the exhaust pipe after treatment can be discharged after being connected in series with an activated carbon adsorption box.

[0036] Reference Figure 1 In order to improve the safety of the treatment process, a gas discharge pipe 19 is provided on the top of the No. 1 tank body 1 and the No. 2 tank body 23 to release the pressure in the tank body when necessary. A pressure relief valve is provided inside the gas discharge pipe 19 to ensure smooth and safe pressure release.

[0037] Reference Figure 1-2 In addition, the discharge ends of tank body No. 1 and tank body No. 2 23 are connected through a connecting pipe 2, one side of the connecting pipe 2 is connected to a collecting pipe 8, one end of the collecting pipe 8 is connected to an auxiliary pipe 9, and auxiliary components are arranged inside, and finally enter the main liquid container 10 for collection.

[0038] Example 2

[0039] refer to Figure 2 , based on the improvement of Example 1: the bottom of the auxiliary pipeline 9 is fixedly connected with a connecting pipe 13, and the other end of the connecting pipe 13 is connected to the main liquid container 10, so that the treated discharge can smoothly enter the main liquid container 10 for collection.

[0040] Specifically, after the collected VOC enters the interior of the collection tube 8 through the connecting tube 2, it will pass through the No. 2 through hole 20 and the No. 1 through hole 12 and enter the interior of the main liquid container 10 through the connecting tube 13 for collection. The floating plate 16 will float on its surface. When the VOC inside the main liquid container 10 is stored to a specified amount, it will touch the sensor 15, causing it to generate an alarm to remind the staff that it needs to be processed. At this time, the main liquid container 10 still has a certain storage space. When the floating plate 16 gradually rises with the increase of the storage amount, the floating plate 16 will block the No. 2 through hole 20 through the baffle 17, so that the collected VOC will enter the auxiliary liquid container connected to the auxiliary pipe 18 through the auxiliary pipe 18 for collection, preventing the staff from not cleaning the main liquid container 10 in time and avoiding its overflow, thereby achieving a practical effect of helping.

[0041] However, as is well known to those skilled in the art, the working principles and wiring methods of the sensor 15 and the alarm are commonplace, and are conventional means or common knowledge, and will not be elaborated here. Those skilled in the art may make any optional selections according to their needs or convenience.

[0042] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A VOC cryogenic treatment collection and recovery device, characterized in that: include: A first tank body (1) and a second tank body (23) are used as containers. The top of the first tank body (1) is provided with a first air inlet end (21), and one side of the first tank body (1) is provided with a first exhaust pipe (7). The top of the second tank body (23) is provided with a second air inlet end (4), and one side of the second tank body (23) is provided with a second exhaust pipe (22). Valves are provided inside the first air inlet end (21), the first exhaust pipe (7), the second air inlet end (4) and the second exhaust pipe (22). The bottoms of the first tank body (1) and the second tank body (23) are provided with exhaust ends. The first tank body (1) and the second tank body (23) are fixedly connected by a same interconnecting pipe (25), and a valve is installed inside the interconnecting pipe (25). An exhaust pipe (6) for conveying exhaust gas, wherein the exhaust pipe (6) is respectively connected to the second air inlet end (4) and the first air inlet end (21); A liquid nitrogen pipe (24) for conveying liquid nitrogen, wherein a second liquid nitrogen conveying pipe (5) is arranged on one side of the second tank body (23), and a valve is arranged inside the second liquid nitrogen conveying pipe (5); a first liquid nitrogen conveying pipe (3) is arranged on one side of the first tank body (1), and a valve is arranged inside the first liquid nitrogen conveying pipe (3); the second liquid nitrogen conveying pipe (5) and the first liquid nitrogen conveying pipe (3) are both connected to one end of the liquid nitrogen pipe (24); The main liquid container (10) is used to collect liquid and solid VOCs. The main liquid container (10) is arranged below the first tank body (1) and the second tank body (23).

2. A VOC cryogenic treatment collection and recovery device according to claim 1, characterized in that: The tops of the first tank body (1) and the second tank body (23) are both provided with a gas discharge pipe (19), and a pressure reducing valve is provided inside the gas discharge pipe (19).

3. A VOC cryogenic treatment collection and recovery device according to claim 2, characterized in that: The discharge ends of the No. 1 tank body (1) and the No. 2 tank body (23) are connected to a same connecting pipe (2), one side of the connecting pipe (2) is connected to a collecting pipe (8), one end of the collecting pipe (8) is connected to an auxiliary pipe (9), and an auxiliary component is arranged inside the auxiliary pipe (9).

4. A VOC cryogenic treatment collection and recovery device according to claim 3, characterized in that: The auxiliary component comprises a partition (11) and a baffle (17); the partition (11) is fixedly arranged inside the auxiliary pipe (9); a second through hole (20) is provided on the surface of the partition (11); the baffle (17) is slidably arranged inside the auxiliary pipe (9) and is located below the partition (11); a first through hole (12) is provided on the surface of the baffle (17); the first through hole (12) is offset from the second through hole (20); a connecting pipe (13) is fixedly connected to the bottom of the auxiliary pipe (9); the other end of the connecting pipe (13) is connected to the main liquid container (10); a connecting rod (14) is fixedly arranged on the bottom of the baffle (17); one end of the connecting rod (14) extends to the inside of the main liquid container (10) through the connecting pipe (13); a floating plate (16) is fixedly arranged on one end of the connecting rod (14) located inside the main liquid container (10).

5. A VOC cryogenic treatment collection and recovery device according to claim 4, characterized in that: One side of the auxiliary pipeline (9) is connected to a secondary pipe (18), and the secondary pipe (18) is located above the partition (11), and the other end of the secondary pipe (18) is connected to a secondary liquid container.

6. A VOC cryogenic treatment collection and recovery device according to claim 5, characterized in that: The auxiliary component also includes a water immersion alarm, which includes a sensor (15) and an alarm. The sensor (15) is arranged at the bottom of the floating plate (16), and the alarm is arranged outside the main liquid container (10). The alarm is electrically connected to the sensor (15) and used in conjunction with it.

7. A VOC cryogenic treatment collection and recovery device according to claim 6, characterized in that: A spacer ring is fixedly arranged at the bottom of the floating plate (16), and the sensor (15) is located inside the spacer ring.

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