CN218516136U - VOC binary channels condensation recovery system - Google Patents
VOC binary channels condensation recovery system Download PDFInfo
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- CN218516136U CN218516136U CN202222792757.1U CN202222792757U CN218516136U CN 218516136 U CN218516136 U CN 218516136U CN 202222792757 U CN202222792757 U CN 202222792757U CN 218516136 U CN218516136 U CN 218516136U
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Abstract
The utility model provides a VOC double-channel condensation recovery system, which comprises a precooling device, two condensation subsystems, a cold source device, an airflow input port, an airflow discharge port, a cold source discharge port and a solvent storage tank; the condensation subsystem comprises a condensation device and a final cooling device, and a condensation airflow channel, a final cooling airflow channel and a condensation cooling airflow channel in the same condensation subsystem are sequentially communicated in series; the two condensation air flow channels are communicated to the precooling air flow channel, the two condensation cold air channels are communicated to the precooling air flow channel, the input ends of the two final cooling source channels are communicated to the cold source device, and the output ends of the two final cooling source channels are communicated to the precooling cold source channel; the two condensing subsystems form a dual-channel structure, so that the treatment efficiency is improved. The cold source can be used for multiple times, and the cold energy of the clean air flow can be utilized, so that the cold energy is fully utilized; the temperature of the VOC gas flow is gradually reduced, the frosting phenomenon caused by too fast temperature reduction is reduced, harmful substances can be comprehensively condensed into a solvent, and the treatment effect is good.
Description
Technical Field
The utility model relates to a volatile gas handles the field, in particular to VOC binary channels condensation recovery system.
Background
VOCs are acronyms for volatile organic compounds (vo l at i l e organic compounds). VOCs in the general sense are commanding organic matters; but the definition in the environmental sense refers to an active class of volatile organic compounds, i.e., a class of volatile organic compounds that can be harmful. Therefore, the VOC needs to be purified and then discharged.
In the prior art, when VOC is purified, the harmful substances in the VOC are condensed and collected by adopting a cold source. When the cold source is reused for heat exchange with the VOC gas flow, the phenomenon of frosting is easily caused due to the fact that the temperature of the VOC gas flow is reduced too fast, so that the treatment speed is reduced, even blockage is caused, and the purification treatment of the VOC is influenced; meanwhile, the cold source is discharged after being used once, so that cold energy is not fully utilized, and waste is caused.
SUMMERY OF THE UTILITY MODEL
The utility model provides a VOC binary channels condensation recovery system can improve the treatment effect to make cold energy make full use of.
The utility model provides a VOC double-channel condensation recovery system, which is used for condensation recovery of VOC airflow and comprises a precooling device, two condensation subsystems, a cold source device, an airflow input port, an airflow discharge port, a cold source discharge port and a solvent storage tank;
a precooling airflow channel and a precooling cold source channel for heat exchange are arranged in the precooling device;
the condensation subsystem comprises a condensation device and a final cooling device, wherein a condensation air flow channel and a condensation cold air channel for heat exchange are arranged in the condensation device, and a final cold air flow channel and a final cold source channel for heat exchange are arranged in the final cooling device;
the gas flow input port is used for accessing VOC gas flow; the air flow discharge port is used for discharging purified clean air flow;
the condensed air flow channel, the final cool air flow channel and the condensed cool air channel which are positioned in the same condensing subsystem are sequentially communicated in series; the condensed air flow channels in the two condensing devices are communicated with the precooling air flow channel, the two condensed cold air channels are communicated with the precooling air flow channel, the input ends of the two final cooling source channels are communicated with the cold source device, and the output ends of the two final cooling source channels are communicated with the input end of the precooling cold source channel;
the cold source device, the final cooling source channel, the precooling cold source channel and the cold source discharge port are sequentially communicated in series;
the condensed air flow channel, the final cool air flow channel and the condensed cool air channel are communicated to the solvent storage tank, so that the solvent formed after the VOC air flow is cooled is guided to the solvent storage tank.
The output port of the precooling airflow channel is connected with a main airflow pipe, the input ports of the two condensing cold air channels are connected with sub airflow pipes, and the two sub airflow pipes are connected in parallel and are communicated with the main airflow pipe;
within the same condensing subsystem: a defrosting three-way valve is arranged between the condensed cold air channel and the airflow discharge port; three interfaces of the defrosting three-way valve are respectively communicated with the condensed cold air channel, the airflow discharge port and a sub airflow pipe of the other condensing subsystem; the defrosting three-way valve has a normal state and a defrosting state; when the defrosting three-way valve is in a normal state, the condensed cold air channel is communicated with a pipeline of the air flow discharge port through the defrosting three-way valve, and a channel between the defrosting three-way valve and the sub air flow pipe of the other condensing subsystem is closed; when the defrosting three-way valve is in a defrosting state, the condensed cold air channel is communicated with a sub airflow pipe of another condensing subsystem through the defrosting three-way valve, and a channel between the defrosting three-way valve and the airflow discharge port is closed;
a cold source valve is arranged between the final cooling source channel and the cold source device, and the cold source valve has a communication state and a closing state; when the cold source valve is in a communication state, the final cooling source channel is communicated with the cold source device through the cold source valve; when the cold source valve is in a closed state, the final cooling source channel and the cold source device are closed through the cold source valve;
when the condensing subsystem normally operates, a cold source valve in the condensing subsystem is in a communicated state, and a defrosting three-way valve is in a normal state;
when the condensation subsystem frosts, a cold source valve in the condensation subsystem is in a closed state, and a defrosting three-way valve is in a defrosting state.
The system comprises a precooling cold source conveying pipe, precooling three-way valves, a precooling cold source discharging port, a precooling cold source conveying pipe, a precooling cold source channel conveying pipe, a precooling cold source discharging port and a precooling cold source channel discharging port, wherein the precooling cold source conveying pipe is connected with the precooling cold source conveying pipe through the precooling cold source conveying pipe;
when the precooling three-way valve is in a precooling state, the precooling cold source conveying pipe is communicated with the input port of the precooling cold source channel through the precooling three-way valve, and the precooling three-way valve is closed with the cold source discharge port;
when the precooling three-way valve is in a discharge state, the precooling cold source conveying pipe is communicated with the cold source discharge port through the precooling three-way valve, and the precooling three-way valve is closed with the input port of the precooling cold source channel;
when the condensing subsystem normally operates, the precooling three-way valve is in a precooling state; when frosting occurs in the condensation subsystem, the pre-cooling three-way valve is in a discharge state.
The VOC dual-channel condensation recovery system also comprises a control module, wherein at least one of a condensation cold air channel, a final cold air channel and a condensation air channel of the same condensation subsystem is provided with a frosting sensor for sensing the frosting state;
the frosting inductor precooling three-way valve, all frost three-way valves and two the equal electricity of cold source valve is connected to control module, control module is used for receiving the signal of frosting inductor and controls the frost inductor precooling three-way valve, two the frost three-way valve reaches two the state of cold source valve.
Wherein, the frosting inductor is one or more of a temperature inductor, a flow velocity inductor and a pressure inductor.
The main airflow pipe is connected with the two sub airflow pipes through a flow dividing three-way valve; the shunt three-way valve has a shunt state and a purification state;
when the flow dividing three-way valve is in a flow dividing state, the main airflow pipe is communicated with the two sub airflow pipes;
when the flow dividing three-way valve is in a purification state, the main airflow pipe is communicated with one of the sub airflow pipes through the flow dividing three-way valve, and the flow dividing three-way valve is closed with the other sub airflow pipe.
And an airflow reversing device is arranged between the defrosting three-way valve and the sub airflow pipe.
And one or more of a stop valve, a flame arrester, a temperature sensor and a pressure sensor are arranged on a pipeline from the precooling airflow channel to the airflow input port.
A buffer device is arranged between the bottom of the precooling device and the solvent storage tank, the buffer device comprises a buffer three-way valve, a buffer tube and a one-way valve, and the precooling airflow channel, the buffer three-way valve, the buffer tube, the one-way valve and the solvent storage tank are sequentially connected; three interfaces of the cache three-way valve are respectively communicated to the airflow input port, the precooling airflow channel and the cache pipe;
the buffer three-way valve has a buffer state and a recovery state: when the cache three-way valve is in a cache state, the airflow input port, the precooling airflow channel and the cache pipe are communicated, the one-way valve is in a closed state, and the cache pipe is used for caching the solvent flowing out from the precooling airflow channel; when the buffer three-way valve is in a recovery state, the buffer three-way valve and the buffer pipe are closed, and the one-way valve is in an open state, so that the solvent in the buffer pipe flows into the solvent storage tank.
Wherein, the air current discharge opening department is provided with the air-blower that is used for accelerating the air current and flows out.
The utility model provides a VOC two-channel condensation recovery system, two condensation subsystems form a two-channel structure, which improves the processing efficiency; the cold source connected to the cold source device can be used for multiple times, and the cold energy of the clean air flow formed by purification can be utilized in the condensing device, so that the cold energy is fully utilized, and the energy is saved; the VOC air current passes through the condensed air current channel, the final cooled air current channel and the condensed cooled air channel in sequence, the temperature is gradually reduced, the frosting phenomenon caused by too fast temperature reduction is reduced, harmful substances can be more comprehensively condensed to form a solvent, and the treatment effect is good.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments are briefly introduced below, and the drawings in the following description are only corresponding drawings of some embodiments of the present invention.
Fig. 1 is a schematic view of a VOC dual-channel condensation recovery system according to a preferred embodiment of the present invention;
FIG. 2 is a schematic view of the VOC two-pass condensate recovery system of FIG. 1 during a defrosting process;
fig. 3 is a schematic view of the VOC dual channel condensate recovery system of fig. 2 after defrosting has been eliminated before normal processing is resumed.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by the skilled in the art without creative work belong to the protection scope of the present invention.
In the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
Referring to fig. 1, a preferred embodiment of the present invention provides a VOC dual-channel condensation recycling system for condensation recycling of VOC gas stream, which comprises a pre-cooling device 10, two condensation subsystems, a cold source device 40, a gas stream input port 51, a gas stream discharge port 52, a cold source discharge port 42, and a solvent storage tank 60. The cold source device 40 is used for providing a cold source for condensation of the VOC gas flow, the gas flow input port 51 is used for accessing the VOC gas flow, the VOC gas flow forms a solvent and a clean gas flow after passing through the pre-cooling device 10 and the condensation subsystem, the solvent enters the solvent storage tank 60, the clean gas flow is discharged through the gas flow discharge port 52, and the cold source is discharged through the cold source discharge port 42 after being used. An air blower for accelerating the air flow is disposed at the air flow discharge port 52 to increase the air flow speed.
A pre-cooling airflow channel 101 and a pre-cooling cold source channel 102 for heat exchange are arranged in the pre-cooling device 10, and airflow inside the pre-cooling airflow channel 101 and the pre-cooling cold source channel 102 can exchange heat in the pre-cooling device 10.
The condensing subsystem comprises a condensing device and a final cooling device, and the number of the condensing subsystems is two. For convenience of description, the two condensing subsystems are a first condensing subsystem 91 and a second condensing subsystem 92, respectively, and the condensing device and the final cooling device in the first condensing subsystem 91 are a first condensing device 21 and a first final cooling device 31, respectively. The condensing units and the final cooling units in the second condensing subsystem 92 are the second condensing unit 22 and the second final cooling unit 32, respectively.
The first condensing unit 21 is provided with a first condensing airflow passage 211 and a first condensing cold air passage 212 for heat exchange, and the first final cooling unit 31 is provided with a first final cold airflow passage 311 and a first final cold source passage 312 for heat exchange. The first condensed air flow channel 211, the first final cool air flow channel 311 and the first condensed cool air channel 212 are communicated in sequence.
The second condensing unit 22 is provided with a second condensing airflow channel 221 and a second condensing cold air channel 222 for heat exchange, and the second final cooling unit 32 is provided with a second final cold airflow channel 321 and a second final cold source channel 322 for heat exchange. The second condensed air flow channel 221, the second final cool air flow channel 321 and the second condensed cool air channel 222 are communicated in sequence.
The input end of the pre-cooling gas flow channel 101 is connected to the gas flow input port 51. One end of the first condensed airflow channel 211, which is far away from the first final cool airflow channel 311, and one end of the second condensed airflow channel 221, which is far away from the second final cool airflow channel 321, are both communicated to the output end of the pre-cool airflow channel 101.
The input ends of the first final cooling source channel 312 and the second final cooling source channel 322 are both communicated to the cold source device 40, the output ends are both communicated to the input end of the pre-cooling cold source channel 102, and the output end of the pre-cooling cold source channel 102 is communicated to the cold source discharge port 42.
The VOC gas stream first passes through the pre-cooling gas flow channel 101 and then is divided into two sub-gas streams, the first sub-gas stream and the second sub-gas stream, respectively entering the first condensation gas flow channel 211 and the second condensation gas flow channel 221. The cool source provided by the cool source device 40 is divided into two paths, and enters the first final cooling source channel 312 and the second final cooling source channel 322.
The first sub-airflow passing through the first condensed airflow channel 211 enters the first final cooling airflow channel 311, and exchanges heat with the cold source in the first final cooling airflow channel 311 and the first final cooling cold source channel 312. The cold source inputted into the first final cooling source channel 312 is the cold source directly outputted from the cold source device 40, and the temperature of the cold source is at the lowest state, so that the temperature of the VOC gas flow can be reduced to the lowest state in the first final cooling device 31, so that the harmful substances in the VOC gas flow can be fully condensed in the first final cooling gas flow channel 311 of the first final cooling device 31 to form a solvent, and a first clean gas flow is formed. The clean air flow has a low temperature, and is guided to the first condensed cold air channel 212 to be used as a refrigerant to cool the VOC air flow in the first condensed air channel 211, so that the VOC air flow can be sufficiently cooled and then discharged through the air flow discharge port 52, thereby saving energy.
The condensation of the second sub-stream entering the second condensed stream channel 221 is performed in the second condensing subsystem, similar to the condensation of the first sub-stream. The second sub air flow enters the second final cooling air flow channel 321 through the second condensed air flow channel 221, and exchanges heat with another cold source in the second final cooling source channel 322 in the second final cooling device 32 to generate a solvent and a second clean air flow, and the second clean air flow enters the second condensed air flow channel 222 to cool the second sub air flow in the second condensed air flow channel 221.
Two cold sources respectively pass through first end cold source passageway 312, second end cold source passageway 322 and carry out the heat exchange after, join the back and enter into precooling cold source passageway 102, carry out preliminary cooling to the VOC air current in precooling airflow channel 101, can be so that the cold source that cold source device 40 provided obtains discharge again after make full use of in precooling apparatus 10 to the energy can be saved. The two condensing subsystems form a dual-channel structure, so that the treatment efficiency is improved.
The same heat exchanger may be used for the pre-cooling device 10, the condensing device 20 and the final cooling device 30 for maintenance. A buffer device (not shown in the figure) can be arranged between the bottom of the heat exchanger and the solvent storage tank, the buffer device is described by taking a precooling device as an example, the buffer device is arranged between the bottom of the precooling device and the solvent storage tank, the buffer device comprises a buffer three-way valve, a buffer pipe and a one-way valve, and the precooling airflow channel, the buffer three-way valve, the buffer pipe, the one-way valve and the solvent storage tank are sequentially connected. Three interfaces of the buffer three-way valve are respectively communicated to the airflow input port, the precooling airflow channel and one end of the buffer pipe, and the one-way valve is connected between the other end of the buffer pipe and the solvent storage tank.
The buffer three-way valve has a buffer state and a recovery state: when the cache three-way valve is in a cache state, the airflow input port, the precooling airflow channel and the cache pipe are communicated, the one-way valve is in a closed state, and the cache pipe is used for caching the solvent flowing out from the precooling airflow channel; when the buffer three-way valve is in the recovery state, the buffer three-way valve and the buffer pipe are closed, and the one-way valve is in the opening state, so that the solvent in the buffer pipe flows into the solvent storage tank. Through the cooperation of buffer memory three-way valve and check valve, when the solvent is full in buffer memory pipe, guide the solvent to the solvent holding vessel again, can be so that the solvent that the condensation formed flows automatically and retrieves, and avoid the VOC air current to enter into in the solvent holding vessel.
The bottom of the condensing unit 20 and the bottom of the final cooling unit 30 are both provided with the above-mentioned buffer units, and the structures thereof are the same as those described above, and are not described herein again.
One or more of a shutoff valve, a flame arrestor, a temperature sensor, a pressure sensor, and the like are provided in a line from pre-cooled gas flow channel 101 to gas flow input port 51. The open or pause access to the VOC gas stream can be controlled by means of a shut-off valve, preferably a pneumatic shut-off valve. The fire arrestor can avoid the conflagration taking place, and temperature sensor, pressure sensor can implement the detection to the temperature and the pressure of the VOC air current of input.
The VOC air current may frost in the pipelines of the first condensing subsystem 91 and the second condensing subsystem 92 due to too low temperature, which may affect the passing speed of the VOC air current, and also may cause the VOC air current to be unable to fully exchange heat to form a solvent, and the VOC air current may not be fully condensed and recycled, causing environmental pollution, and therefore the problem of frost needs to be treated, and the following is a solution in this embodiment.
An output port of the pre-cooling airflow channel 101 is connected with a main airflow pipe 110, an input port of the first condensation airflow channel 211 is connected with a first sub airflow pipe 111, an input port of the second condensation airflow channel 221 is connected with a second sub airflow pipe 112, and the first sub airflow pipe 111 and the second sub airflow pipe 112 are arranged in parallel and are both communicated with the main airflow pipe 110. The first sub airflow pipe 111, the second sub airflow pipe 112, and the main airflow pipe 110 may be connected by a shunt three-way valve 113, and the shunt three-way valve 113 may control the connection and disconnection of three pipelines, where the three pipelines may be connected by a three-way valve.
A first defrosting three-way valve 71 is arranged on a pipeline between the first condensed cold air channel 212 and the air flow discharge port 52, and three interfaces of the first defrosting three-way valve 71 are respectively communicated with the first condensed cold air channel 212, the air flow discharge port 52 and the second sub air flow pipe 112 of the second condensing subsystem 92. More specifically, the first defrosting three-way valve 71 may be communicated to the second sub gas flow pipe 112 through a first defrosting pipe, and a three-way pipe is provided at a middle portion of the second sub gas flow pipe 112, and the three-way pipe is communicated with the first defrosting pipe.
The first defrosting three-way valve 71 has a normal state and a defrosting state.
As shown in fig. 1, when the first frost three-way valve 71 is in a normal state, the pipeline of the first condensate cold air channel 212 and the air flow discharge port 52 is communicated through the first frost three-way valve 71, and the space between the first frost three-way valve 71 and the second sub-air flow pipe 112 of the second condensation subsystem 92 is closed, and at this time, the air flow flowing out of the first condensate cold air channel 212 can be discharged through the air flow discharge port 52.
As shown in fig. 2, when the first defrosting three-way valve 71 is in a defrosting state, the first condensate cold air passage 212 is communicated with the second air flow sub-pipe 112 of the second condensation subsystem 92 through the first defrosting three-way valve 71, and the first defrosting three-way valve 71 is closed to the air flow discharge port 52, at this time, the air flows from the first condensate cold air passage 212 and the second air flow sub-pipe 112 are not discharged through the air flow discharge port 52, and the VOC air flow can be communicated between the first condensate cold air passage 212 and the second air flow sub-pipe 112.
A second frost three-way valve 72 is arranged on a pipeline between the second condensate cold air channel 222 and the air flow discharge port 52, and three interfaces of the second frost three-way valve 72 are respectively communicated with the second condensate cold air channel 222, the air flow discharge port 52 and the first sub air flow pipe 111 of the first condensation subsystem 91. More specifically, the second defrosting three-way valve 72 may be communicated to the first sub gas flow pipe 111 through a second defrosting pipe, and a three-way pipe is provided at a middle portion of the first sub gas flow pipe 111, and the three-way pipe is communicated with the second defrosting pipe.
The second frost three-way valve 72 has a normal state and a frost formation state. When the second frost three-way valve 72 is in a normal state, the second condensed cold air channel 222 is communicated with the pipeline of the air flow discharge port 52 through the second frost three-way valve 72, the second frost three-way valve 72 is closed to the first sub air flow pipe 111 of the first condensation subsystem 91, and at this time, the air flow flowing out of the second condensed cold air channel 222 can be discharged through the air flow discharge port 52. When the second defrosting three-way valve 72 is in a defrosting state, the second condensed cold air passage 222 is communicated with the first sub air flow pipe 111 of the first condensing subsystem 91 through the first defrosting three-way valve 71, and the second defrosting three-way valve 72 is closed from the air flow discharge port 52, at this time, air flows from the second condensed cold air passage 222 and the first sub air flow pipe 111 are not discharged through the air flow discharge port 52, and the VOC air flow can be communicated between the second condensed cold air passage 222 and the first sub air flow pipe 111.
A first cold source valve 411 is arranged between the first final cold source channel 312 and the cold source device 40, and the first cold source valve 411 is used for controlling the on-off between the first final cold source channel 312 and the cold source device 40. The first cool source valve 411 has a connection state and a closing state: as shown in fig. 1, when the first cold source valve 411 is in a communication state, the first final cold source channel 312 is communicated with the cold source device 40 through the first cold source valve 411, and at this time, the cold source device 40 is connected to the cold source device 40 and then can provide a cold source into the first final cold source channel 312; as shown in fig. 2, when the first cool source valve 411 is in a closed state, the first cool final source passage 312 and the cool source device 40 are closed by the first cool source valve 411, and at this time, the cool source device 40 stops providing the cool source to the first cool final source passage 312.
A second cold source valve 412 is disposed between the second final cold source channel 322 and the cold source device 40, and the second cold source valve 412 is used for controlling on-off between the second final cold source channel 322 and the cold source device 40. The second cool source valve 412 has a closed state and an open state: when the second cold source valve 412 is in the connection state, the second final cold source channel 322 is connected to the cold source device 40 through the second cold source valve 412, and at this time, the cold source device 40 can provide the cold source to the second final cold source channel 322; when the second cool down source channel 322 and the cool source device 40 are closed by the second cool down source valve 412 while the second cool down valve 412 is in the closed state, the cool source device 40 stops providing the cool source to the second cool down source channel 322.
As shown in fig. 1, when the first condensing subsystem 91 is normally operated, the first cold source valve 411 is in a communication state, and the first frost three-way valve 71 is in a normal state. When the second condensing subsystem 92 is normally operated, the second cool source valve 412 is in a connected state, and the second frost three-way valve 72 is in a normal state.
When frosting occurs in the first condensing subsystem 91, as shown in fig. 2, the first cold source valve 411 is in a closed state, and the first defrosting three-way valve 71 is in a defrosting state. At this time, the first final cooling source channel 312 and the cold source device 40 are closed by the first cold source valve 411, so that the cold source device 40 does not provide a cold source to the first final cooling source channel 312 any more, and the condensation process of the first condensation subsystem 91 is stopped; the space between the first condensed cold air channel 212 and the air flow discharge port 52 is in a closed state through the first defrosting three-way valve 71, so that the first stream of clean air cannot be discharged through the first defrosting three-way valve 71 and the air flow discharge port 52; the second sub airflow pipe 112 of the second condensing subsystem 92 is in communication with the first condensed cold air channel 212 through the first defrosting three-way valve 71, so that the VOC airflow can sequentially enter the first condensed cold air channel 212, the first final cold air channel 311 and the first condensed air channel 211 through the second sub airflow pipe 112 of the second condensing subsystem 92 for defrosting.
By using the first defrosting three-way valve 71, the VOC gas flow which is not condensed by the two condensing subsystems and has a higher temperature can reversely flow along the purification route in the first condensing subsystem 91 and sequentially pass through the first condensing cold gas channel 212, the first final cold gas channel 311 and the first condensing gas channel 211 in the first condensing subsystem 91, so as to defrost by using the VOC gas flow having a higher temperature; the VOC gas flow for defrosting flows out of the first condensation gas flow channel 211 and then enters the second condensation subsystem 92 through the first sub gas flow pipe 111 and the second sub gas flow pipe 112, at this time, the second condensation subsystem 92 is in a normal working state, and the VCO gas flow for defrosting can be processed in the second condensation subsystem 92 to form a clean gas flow and then discharged. When the first condensing subsystem 91 is frosted, the first cold source valve 411, the first defrosting three-way valve 71 and the second condensing subsystem 92 can ensure the uninterrupted processing of the VOC gas flow.
When frosting occurs in the second condensing subsystem 92, the second cold source valve 412 is in a closed state, the second defrosting three-way valve 72 is in a defrosting state, at this time, the second condensing subsystem 92 can be defrosted, the VOC gas flow can be continuously processed through the first condensing subsystem 91, the defrosting process is similar to that of the first condensing subsystem 91, and details are not repeated here.
In order to further improve the defrosting effect: the output ports of the first final cooling source channel 312 and the second final cooling source channel 322 are both communicated to the pre-cooling cold source conveying pipe 33, a pre-cooling three-way valve 43 is arranged between the pre-cooling cold source conveying pipe 33 and the input port of the pre-cooling cold source channel 102, two cold source airflows which are subjected to heat exchange in the first final cooling source channel 312 and the second final cooling source channel 322 are converged into the pre-cooling cold source conveying pipe 33, are conveyed to the pre-cooling three-way valve 43 through the pre-cooling cold source conveying pipe 33, and pass through the pre-cooling three-way valve 43, so that the cold source airflows in the pre-cooling cold source conveying pipe 33 enter the pre-cooling cold source channel 102 or are directly discharged through the cold source discharge port 42.
Three ports of the pre-cooling three-way valve 43 are respectively communicated to the pre-cooling cold source delivery pipe 33, the input port of the pre-cooling cold source channel 102, and the cold source discharge port 42, and the pre-cooling three-way valve 43 has a pre-cooling state and a discharge state.
As shown in fig. 1, when the precooling three-way valve 43 is in a precooling state, the precooling cold source conveying pipe 33 is communicated with the input port of the precooling cold source channel 102 through the precooling three-way valve 43, and the precooling three-way valve 43 is closed with the cold source discharge port 42, at this time, the cold source airflow in the precooling cold source conveying pipe 33 enters the precooling cold source channel 102 to precool the VOC airflow, and does not discharge the VOC airflow through the cold source discharge port 42.
As shown in fig. 2, when the precooling three-way valve 43 is in a discharging state, the precooling cold source delivery pipe 33 is communicated with the cold source discharging port 42 through the precooling three-way valve 43, and the precooling three-way valve 43 is closed from the input port of the precooling cold source channel 102, at this time, the cold source airflow entering the precooling cold source delivery pipe 33 is directly discharged through the cold source discharging port 42 without passing through the precooling cold source channel 102.
When the first condensing subsystem 91 and the second condensing subsystem 92 both normally operate, the pre-cooling three-way valve 43 is in a pre-cooling state to perform secondary utilization on cold energy of the cold source. When the frosting phenomenon occurs in any one of the first condensing subsystem 91 and the second condensing subsystem 92, the precooling three-way valve 43 is in the discharge state, so that the cold source provided by the cold source device 40 is not reused, namely, the VOC air flow is not precooled by the precooling device 10, the air flow entering the main air flow pipe 110 is not precooled, the temperature of the air flow is higher than that of the air flow precooled, the VOC air flow enters the condensing subsystem with the frosting phenomenon, and the defrosting efficiency and the defrosting effect can be improved.
The VOC dual-channel condensation recovery system further includes a control module (not shown in the figure), at least one of the condensed cold air channel 202, the final cold air channel 301 and the condensed air channel 201 of the same condensation subsystem is provided with a frosting sensor (not shown in the figure), that is, at least one of the first condensed cold air channel 212, the first final cold air channel 311 and the first condensed air channel 211 is provided with a frosting sensor (not shown in the figure), and at least one of the second condensed cold air channel 222, the second final cold air channel 321 and the second condensed air channel 221 is provided with a frosting sensor for sensing a frosting state.
The frosting sensor, the first frosting three-way valve 71, the second frosting three-way valve 72, the first cold source valve 411, the second cold source valve 412 and the precooling three-way valve 43 are electrically connected to the control module, and the control module is used for receiving the signal of the frosting sensor and controlling the states of the first frosting three-way valve 71, the second frosting three-way valve 72, the first cold source valve 411, the second cold source valve 412, the precooling three-way valve 43 and the like.
The frosting sensor can be one or more of a temperature sensor, a flow velocity sensor and a pressure sensor. When the frosting phenomenon occurs in each condensing subsystem, the temperature, the flow and the pressure of the air flow in the condensing cold air channel 202, the final cold air flow channel 301 and the condensing air flow channel 201 are all changed, the change of the air flow is detected by the control module, if the sensing signal of the frosting sensor exceeds the frosting threshold value, the frosting phenomenon occurs in the condensing subsystem, and the states of the defrosting three-way valve, the cold source valve and the precooling three-way valve 43 are controlled to be changed.
If the frosting sensor is a temperature sensor, the frosting threshold value is a temperature value. If the frosting sensor is a flow sensor, the frosting threshold value is a flow value passing through in unit time. If the frosting sensor is a flow rate sensor, the frosting threshold value is the flow rate value of the air flow. If the frosting sensor is a pressure sensor, the frosting threshold value is the pressure value in the pipeline.
Taking the first condensing subsystem 91 as an example, the frosting phenomenon occurs, when the sensing signal of the frosting sensor exceeds the frosting threshold, the control module can control the first defrosting three-way valve 71 to be in the defrosting state, the precooling three-way valve 43 to be in the discharging state, and the first cold source valve 411 to be in the closing state, so that the first condensing subsystem 91 stops condensing, and the VOC gas flow which is not subjected to precooling treatment directly reversely passes through the first condensing subsystem 91 to be subjected to defrosting treatment.
When the frosting state of the first condensing subsystem 91 occurs, the first defrosting three-way valve 71 is controlled to be in the frosting state, and then the first cold source valve 411 is controlled to be in the closing state, so that the situation that the VOC gas flow which is not subjected to purification treatment is discharged through the first defrosting three-way valve 71 after the first cold source valve 411 is avoided.
In this embodiment, the main gas flow pipe 110 is connected to the first sub gas flow pipe 111 and the second sub gas flow pipe 112 by a three-way bypass valve 113. The flow-dividing three-way valve 113 has a flow-dividing state and a purge state.
When the three-way valve 113 is in the diversion state, the main airflow pipe 110 is connected to the first sub airflow pipe 111 and the second sub airflow pipe 112, so that the VOC airflow can be divided into two flows by the three-way valve 113 and enter the first sub airflow pipe 111 and the second sub airflow pipe 112.
When the three-way shunt valve 113 is in a purification state, the main gas flow pipe 110 is communicated with the sub gas flow pipe of the condensation subsystem which finishes defrosting through the three-way shunt valve 113, and the three-way shunt valve 113 is closed with the sub gas flow pipe of the condensation subsystem which does not frost.
For example, after the first condensing subsystem 91 is frosted and the defrosting process is completed, the internal pipeline is recovered to normal, as shown in fig. 3, at this time, the first cold source valve 411 is controlled to be in an open state, the shunt three-way valve 113 is controlled to be in a purification state, the first defrosting three-way valve 71 is kept in the defrosting state, the main air flow pipe 110 is communicated with the first sub air flow pipe 111, and is disconnected from the second sub air flow pipe 112, so that the VOC air flow of the main air flow pipe 110 enters the first condensing subsystem 91 through the first sub air flow pipe 111 for purification, the treated clean air flow can enter the second condensing subsystem 92 through the first defrosting three-way valve 71, and the VOC air flow for defrosting remaining in the first condensing cold air passage is purified in the second condensing subsystem 92. After a period of operation, at this time, there is no longer an untreated VOC gas flow in the first condensed cold air channel, and then the first defrosting three-way valve 71 is controlled to be in a normal state, so that the first condensing subsystem resumes normal operation.
Here, whether the defrosting operation is completed may be judged by whether the signal of the frost formation sensor is restored to normal.
In this embodiment, the control module controls the state switching of the components such as the precooling three-way valve, the defrosting three-way valve and the cold source valve, in other embodiments, the components can be manually operated in a manual mode, and the frosting sensor can be connected with an audible and visual alarm device to prompt an operator to operate the components.
In the above embodiment, the VOC gas flow for defrosting remaining in the first condensed cold air passage is removed by the diversion three-way valve 113, and here, a gas flow reversing device may be disposed between the first defrosting three-way valve and the second sub gas flow pipe, and the VOC gas flow for defrosting is removed by controlling the gas flow direction between the first defrosting three-way valve and the second sub gas flow pipe. For example, when the frosting of the first condensation subsystem is eliminated, the airflow reversing device is controlled to enable the flowing direction of the airflow to be from the second sub airflow pipe to the first defrosting three-way valve so as to guide the VOC airflow for defrosting into the first condensation subsystem; when frost is eliminated, the airflow reversing device is switched to enable the flowing direction of the airflow to be from the first defrosting three-way valve to the second sub airflow pipe, so that the VOC airflow for defrosting enters the second sub airflow pipe and is purified through the second condensing subsystem.
In the above embodiment, there are two condensing subsystems, and it can be seen from the above embodiment that, when there are two condensing subsystems, the condensing airflow channel, the final cool airflow channel, and the condensing cool airflow channel in the same condensing subsystem are sequentially connected in series; the condensation air flow channels in all the condensing devices are communicated with the precooling air flow channels, the condensation cold air channels in the two condensing devices are communicated with the precooling air flow channels, and the final cooling source channels in the two final cooling devices are communicated with the cold source devices; the input port of each condensing cold air channel is connected with a sub-airflow pipe, and the two sub-airflow pipes are arranged in parallel and are both communicated with the main airflow pipe; the defrosting three-way valve and the sub-gas flow pipes of the condensing subsystem can be sequentially connected in a circulating manner, so that VOC gas flow is conveyed to the defrosting three-way valve and the channel of the defrosting three-way valve of the condensing subsystem with the frosting phenomenon through the sub-gas flow pipes of other condensing subsystems, and defrosting treatment is carried out on the VOC gas flow.
The utility model discloses a VOC binary channels condensation recovery system to the purification treatment process of VOC air current as follows.
And sequentially carrying out primary precooling treatment, secondary condensing treatment and tertiary final cooling treatment on the VOC gas flow to finally generate clean gas flow, and generating and collecting a solvent in the primary precooling treatment, the secondary condensing treatment and the tertiary final cooling treatment on the VOC gas flow. The primary precooling treatment is carried out in the precooling device 10, the secondary condensing treatment is carried out in the first and second condensing devices, and the tertiary final cooling treatment is carried out in the first and second final cooling devices. The solvent is recovered to the solvent storage tank 60. The temperature of the VOC gas flow is gradually reduced, and frosting caused by too fast temperature reduction can be reduced. The clean air flow is used as a refrigerant for secondary condensation treatment, so that the cold energy of the clean air flow can be fully utilized, and the utilization rate of the cold energy is improved.
The refrigerant in the third-stage final cooling treatment is a cold source, and the cold source is a cold source directly output from the cold source device 40. The cold source is liquid nitrogen, and the cold source device 40 can be a liquid nitrogen tank. The cold source forms a secondary cold source after three-stage final cooling treatment, namely the air flows flowing out of the first and second final cooling source channels are the secondary cold source, and the secondary cold source is used as a refrigerant for the first-stage pre-cooling treatment; the clean air flow is used as a refrigerant for secondary condensation treatment. In first, second end cold charge, the cold source is located first, second end cold source pipeline, forms the secondary cold source after the heat exchange to guide as the refrigerant of one-level precooling processing in the precooling apparatus, make the cold source can reutilization, improve cold energy utilization ratio.
Sequentially carrying out primary precooling treatment, secondary condensation treatment and tertiary final cooling treatment on the VOC gas flow, and then carrying out primary flow distribution on the VOC gas flow so as to divide the VOC gas flow into two sub-gas flows which are sequentially subjected to the secondary condensation treatment and the tertiary final cooling treatment respectively; namely, the water enters each condensing subsystem for treatment. For example, after the first-stage pre-cooling treatment, the VOC gas stream flows out from the pre-cooling device 10 and is divided into two sub-gas streams, i.e., a first sub-gas stream and a second sub-gas stream, the first sub-gas stream enters the first condensing subsystem 91, and the second sub-gas stream enters the second condensing subsystem 92. Each sub-gas flow is purified by a route which is sequentially passed through in the condensation recovery process of the condensation subsystem. For example, in the condensing recovery of the first condensing subsystem 91, the first sub-gas flow is purified by the first condensing gas flow channel 211, the first final cooling gas flow channel and the first condensing gas flow channel 211.
The VOC condensation recovery method further comprises the following defrosting treatment steps. When the frosting phenomenon occurs in one of the sub-air flow purification treatment processes, the defrosting treatment step is executed to solve the frosting phenomenon,
the defrosting treatment step comprises: closing the discharge channel of the strand of air flow, interrupting the supply of the cold source in the three-stage final cooling treatment of the strand of air flow, performing secondary flow division on the other strand of air flow to divide a strand of defrosting air flow, and reversely flowing the defrosting air flow along the purification route of the strand of air flow to perform defrosting treatment until the frosting phenomenon is eliminated.
In combination with the second embodiment of the VOC dual-channel condensation recycling system, when the first sub-air flow frosts in the first condensation subsystem 91, the discharge channel of the first sub-air flow is closed, and the discharge of the first sub-air flow is stopped, that is, the first defrosting three-way valve 71 is controlled to be in a defrosting state; the supply of the cold source of the first final cooling device 31 in the three-stage final cooling treatment is interrupted, that is, the first cold source valve 411 is closed, so that the cold source cannot enter the first final cooling source channel in the first final cooling device 31, and the supply of the cold source in the three-stage final cooling treatment is further realized.
And performing secondary flow division on the second sub airflow to divide a first flow of defrosting airflow, wherein the first flow of defrosting airflow reversely flows along the purification route of the first sub airflow to perform defrosting treatment, namely sequentially passes through the first condensing airflow channel, the first final cooling airflow channel 311 and the first condensing airflow channel 211. Because the first stream of defrosting air flow is not purified by the second condensing subsystem 92, and the temperature of the first stream of defrosting air flow is still in a higher state, each pipeline of the first condensing subsystem 91 can be heated, and the defrosting purpose is further achieved.
In order to improve the defrosting effect, the secondary cold source formed after the three-stage final cooling treatment is directly discharged, the supply of the refrigerant subjected to the primary pre-cooling treatment is interrupted, namely, a pipeline between the first final cooling source channel 312 and the pre-cooling cold source channel 102 is closed, and the first final cooling source channel 312 is directly communicated to the cold source discharge port 42, so that the secondary cold source flowing out of the first final cooling source channel 312 is directly discharged, and secondary utilization is not performed any more. So that the VOC gas stream bypasses the first pre-cooling treatment and its temperature does not drop, thereby defrosting the first condensing subsystem 91 at a higher temperature.
After the frosting phenomenon is eliminated, the normal operation of the VOC gas flow is restored. In order to avoid discharging unpurified VOC gas flow, after the frosting phenomenon is eliminated, a flow dividing channel between the VOC gas flow and the other sub-gas flow is closed to stop supplying the defrosting gas flow; and recovering cold source supply in the three-stage final cooling treatment of the frost-removing sub-airflow, wherein the frost-removing sub-airflow flows along a purification route to perform purification treatment, and the purified clean airflow enters the purification route of the other sub-airflow along the reverse route of the frost-removing airflow. After the operation is carried out for a preset time, the discharge channel of the sub airflow for eliminating the frosting is opened, the channel for leading the defrosting airflow to reversely enter the secondary condensation treatment is closed, and finally, the flow dividing channel between the VOC airflow and the other sub airflow is recovered.
More specifically, for example, after the frost formation phenomenon of the first condensing subsystem 91 is eliminated, the flow dividing passage between the VOC gas flow and the second substream is closed, and the flow dividing three-way valve 113 is in a purification state, so that the second substream is not reformed into the first frost gas flow. The first sub-air flow flows into the first condensing subsystem 91 along its own purifying route for purification treatment, and forms a clean air flow, and the clean air flow enters the purifying route of the second sub-air flow along the reverse route of the first defrosting air flow, namely, enters the second condensing subsystem 92. After the operation is preset for a long time, it can be ensured that the first condensation cold air channel 212 is not internally provided with the first unpurified defrosting air flow, the discharge channel of the first strand of sub air flow is opened again, the channel of the first defrosting air flow entering the first condensing device 21 is closed at the same time, the shunting channel between the VOC air flow and the second strand of sub air flow is opened again at last, the shunting three-way valve 113 is in a shunting state, at the moment, the normal treatment of the VOC air flow is recovered, and the defrosting treatment is completed.
When the frosting phenomenon occurs in the second sub airflow, the first sub airflow is divided for the second time to divide the second defrosting airflow, and the second defrosting airflow is used for defrosting the purification channel of the second sub airflow, and the process is the same as the process when the frosting phenomenon occurs in the first sub airflow, and is not repeated here.
In summary, although the present invention has been described with reference to the preferred embodiments, the above-described preferred embodiments are not intended to limit the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, so that the scope of the present invention shall be determined by the scope of the appended claims.
Claims (10)
1. A VOC double-channel condensation recovery system is used for carrying out condensation recovery on VOC air flow and is characterized by comprising a precooling device, two condensation subsystems, a cold source device, an air flow input port, an air flow discharge port, a cold source discharge port and a solvent storage tank;
a precooling airflow channel and a precooling cold source channel for heat exchange are arranged in the precooling device;
the condensation subsystem comprises a condensation device and a final cooling device, wherein a condensation air flow channel and a condensation cold air channel for heat exchange are arranged in the condensation device, and a final cold air flow channel and a final cold source channel for heat exchange are arranged in the final cooling device;
the gas flow input port is used for accessing VOC gas flow; the air flow discharge port is used for discharging purified cleaning air flow;
the condensed air flow channel, the final cool air flow channel and the condensed cool air channel which are positioned in the same condensing subsystem are sequentially communicated in series; the condensed air flow channels in the two condensing devices are communicated with the precooling air flow channel, the two condensed cold air channels are communicated with the precooling air flow channel, the input ends of the two final cooling source channels are communicated with the cold source device, and the output ends of the two final cooling source channels are communicated with the input end of the precooling cold source channel;
the cold source discharge port is used for discharging a cold source, and the cold source device, the final cooling cold source channel, the precooling cold source channel and the cold source discharge port are sequentially communicated in series;
the condensed air flow channel, the final cool air flow channel and the condensed cool air channel are communicated to the solvent storage tank, so that the solvent formed after the VOC air flow is cooled is guided to the solvent storage tank.
2. The VOC dual-channel condensation recovery system of claim 1, wherein the output port of the pre-cooling gas flow channel is connected with a main gas flow pipe, the input ports of the two condensation gas flow channels are connected with sub gas flow pipes, and the two sub gas flow pipes are arranged in parallel and are communicated with the main gas flow pipe;
within the same condensing subsystem: a defrosting three-way valve is arranged between the condensed cold air channel and the airflow discharge port; three interfaces of the defrosting three-way valve are respectively communicated with the condensed cold air channel, the airflow discharge port and a sub airflow pipe of the other condensing subsystem; the defrosting three-way valve has a normal state and a defrosting state; when the defrosting three-way valve is in a normal state, the pipeline of the condensed cold air channel and the pipeline of the air flow discharge port are communicated through the defrosting three-way valve, and the channel between the defrosting three-way valve and the sub air flow pipe of the other condensing subsystem is closed; when the defrosting three-way valve is in a defrosting state, the condensed cold air channel is communicated with a sub airflow pipe of another condensing subsystem through the defrosting three-way valve, and a channel between the defrosting three-way valve and the airflow discharge port is closed; a cold source valve is arranged between the final cooling source channel and the cold source device, and the cold source valve has a communication state and a closing state; when the cold source valve is in a communication state, the final cooling source channel is communicated with the cold source device through the cold source valve; when the cold source valve is in a closed state, the final cooling source channel and the cold source device are closed through the cold source valve;
when the condensing subsystem normally operates, a cold source valve in the condensing subsystem is in a communicated state, and a defrosting three-way valve is in a normal state;
when the condensation subsystem frosts, a cold source valve in the condensation subsystem is in a closed state, and a defrosting three-way valve is in a defrosting state.
3. The VOC dual-channel condensation recycling system of claim 2, wherein the output ports of the two final cooling source channels are both communicated with a pre-cooling cold source conveying pipe, a pre-cooling three-way valve is arranged between the pre-cooling cold source conveying pipe and the input port of the pre-cooling cold source channel, three interfaces of the pre-cooling three-way valve are respectively communicated with the pre-cooling cold source conveying pipe, the input port of the pre-cooling cold source channel and the cold source discharge port, and the pre-cooling three-way valve has a pre-cooling state and a discharge state;
when the precooling three-way valve is in a precooling state, the precooling cold source conveying pipe is communicated with the input port of the precooling cold source channel through the precooling three-way valve, and the precooling three-way valve is closed with the cold source discharge port;
when the precooling three-way valve is in a discharge state, the precooling cold source conveying pipe is communicated with the cold source discharge port through the precooling three-way valve, and the precooling three-way valve is closed with the input port of the precooling cold source channel;
when the condensing subsystem normally operates, the precooling three-way valve is in a precooling state; when frosting occurs in the condensation subsystem, the pre-cooling three-way valve is in a discharge state.
4. The VOC dual-channel condensation recovery system of claim 3, further comprising a control module, wherein at least one of the condensation cold air channel, the final cold air channel and the condensation air channel of the same condensation subsystem is provided with a frosting sensor for sensing frosting state;
the frosting inductor, precooling three-way valve, all change the frost three-way valve, and two the cold source valve all is connected electrically to control module, control module is used for receiving the signal of frosting inductor and controls precooling three-way valve, two change the frost three-way valve, and two the state of cold source valve.
5. The VOC dual channel condensate recovery system of claim 4 wherein the frost sensor is a combination of one or more of a temperature sensor, a flow rate sensor, a pressure sensor.
6. The VOC dual channel condensate recovery system of claim 3 wherein the main gas flow line is connected to the two sub gas flow lines by a three-way split valve; the flow dividing three-way valve has a flow dividing state and a purifying state;
when the flow dividing three-way valve is in a flow dividing state, the main airflow pipe is communicated with the two sub airflow pipes;
when the flow dividing three-way valve is in a purification state, the main airflow pipe is communicated with one of the sub airflow pipes through the flow dividing three-way valve, and the flow dividing three-way valve is closed with the other sub airflow pipe.
7. The VOC two-channel condensation recovery system of claim 2, wherein an air flow reversing device is arranged between the defrosting three-way valve and the sub air flow pipe.
8. The dual channel VOC condensation recovery system according to claim 1, wherein the pre-cooled airflow channel is piped to the airflow input with one or more of a shutoff valve, a flame arrestor, a temperature sensor, and a pressure sensor.
9. The VOC dual-channel condensation recovery system according to claim 1, wherein a buffer device is arranged between the bottom of the pre-cooling device and the solvent storage tank, the buffer device comprises a buffer three-way valve, a buffer pipe and a one-way valve, and the pre-cooling airflow channel, the buffer three-way valve, the buffer pipe, the one-way valve and the solvent storage tank are sequentially connected; three interfaces of the cache three-way valve are respectively communicated to the airflow input port, the precooling airflow channel and the cache pipe;
the buffer three-way valve has a buffer state and a recovery state: when the cache three-way valve is in a cache state, the airflow input port, the precooling airflow channel and the cache pipe are communicated, the one-way valve is in a closed state, and the cache pipe is used for caching the solvent flowing out from the precooling airflow channel; when the buffer three-way valve is in a recovery state, the buffer three-way valve and the buffer pipe are closed, and the one-way valve is in an open state, so that the solvent in the buffer pipe flows into the solvent storage tank.
10. A VOC dual channel condensate recovery system according to claim 1 wherein the air stream discharge outlet is provided with a blower for increasing the outflow of the air stream.
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