Environment-friendly film making device capable of recycling tail gas

Abstract

The utility model discloses an environment-friendly film making device capable of recycling tail gas, which comprises a film making machine, a tail gas outlet pipe, a heat exchange unit, a condensation gas inlet pipe, a condensation unit, a condensation gas outlet pipe, a heater and a circulating pipe, the condensing unit comprises a condenser, a first liquid collecting pipe and a first liquid collecting pool, the first liquid collecting pipe is respectively communicated with the condenser and the first liquid collecting pool, an inlet of the tail gas outlet pipe is connected with a drying tunnel of the film making machine, an outlet of the tail gas outlet pipe is connected with an inlet of each first flow channel, and an inlet of the condensing gas inlet pipe is connected with an outlet of each first flow channel; an outlet of the condensation air inlet pipe and an inlet of the condensation air outlet pipe are respectively connected with the condenser, an outlet of the condensation air outlet pipe and an inlet of the circulating pipe are respectively connected with the heater, and an outlet of the circulating pipe is connected with a film-making machine drying tunnel. The device not only can recycle the heat and the organic solvent in the tail gas, but also does not generate discharged tail gas to cause environmental pollution.

Description

Technical Field

[0001] The utility model relates to the technical field of film making and film processing equipment, in particular to an environmentally friendly film making device for recycling tail gas. Background Art

[0002] Wet film making technology is applied to various industries and has a wide range of uses in polymer films, ceramic films, multilayer capacitors and inductors.

[0003] In actual production, most polymer materials need to be dissolved in organic solvents such as N,N-dimethylformamide, N-methylpyrrolidone, and dimethyl sulfoxide. When drying in the film-making oven, a large amount of organic solvent vapor and other tail gas will be generated. There is usually an exhaust port above the oven of the film-making machine, and the tail gas is directly discharged through the exhaust port. Direct exhaust gas discharge will cause environmental pollution. If the tail gas is directly treated separately, the tail gas treatment is complicated, the energy consumption is high, and secondary pollution will occur. Summary of the invention

[0004] In order to solve the problems existing in the above-mentioned prior art, the utility model provides an environmentally friendly film-making device for recycling exhaust gas. The device has a simple structure and recycles the generated exhaust gas. Not only can the heat of the exhaust gas be reused and the organic solvent in the exhaust gas be recycled, but it also does not generate exhaust gas to cause environmental pollution.

[0005] The technical solution adopted to achieve the above-mentioned purpose of the utility model is:

[0006] The invention discloses an environment-friendly film-making device for recycling exhaust gas, comprising a film-making machine, an exhaust gas outlet pipe, a heat exchange unit, a condensation inlet pipe, a condensation unit, a condensation outlet pipe, a heater and a circulation pipe, wherein the heat exchange unit comprises a heat exchanger, and the heat exchanger comprises at least a first flow channel and a second flow channel, and the condensation unit comprises a condenser, a first collecting pipe and a first collecting tank, and the condenser is provided with a gas inlet, a first liquid outlet and a gas outlet, one end of the first collecting pipe is connected to the first liquid outlet, and the other end of the first collecting pipe is connected to the first collecting tank, the inlet of the exhaust gas outlet pipe is connected to the exhaust port of a drying channel of the film-making machine, the outlet of the exhaust gas outlet pipe is connected to the inlet of each first flow channel, the inlet of the condensation inlet pipe is connected to the outlet of each first flow channel, the outlet of the condensation inlet pipe is connected to the gas inlet, the inlet of the condensation outlet pipe is connected to the gas outlet, the outlet of the condensation outlet pipe is connected to the heater inlet, the inlet of the circulation pipe is connected to the outlet of the heater, and the outlet of the circulation pipe is connected to the drying channel of the film-making machine.

[0007] The heat exchange unit also includes a second liquid collecting pipe and a second liquid collecting tank. The heat exchanger is a single-pass shell and tube heat exchanger. The heat exchanger has a shell inlet and a shell outlet. The tail gas outlet is connected to the shell inlet, the condensation inlet is connected to the shell outlet, and a second liquid outlet is provided at the bottom of the shell shell. One end of the second liquid collecting pipe is connected to the second liquid outlet, and the other end of the second liquid pipe is connected to the second liquid collecting tank.

[0008] It also includes a heating air inlet pipe. The heat exchanger also has a tube inlet and a tube outlet. The condensing air outlet pipe outlet is connected to the tube inlet, the tube outlet is connected to the heating air inlet pipe inlet, and the heating air inlet pipe outlet is connected to the heater inlet.

[0009] It also includes a free radical scavenging tank, which contains a free radical scavenger. The circulation pipe includes a first circulation branch pipe and a second circulation branch pipe. The inlet of the first circulation branch pipe is connected to the outlet of the heater. The first circulation branch pipe and the second circulation branch pipe are respectively fixed and penetrate the free radical scavenging tank. The outlet of the first circulation branch pipe is located inside the free radical scavenger, the inlet of the second circulation branch pipe is located above the free radical scavenger, and the outlet of the second circulation branch pipe is connected to the drying tunnel of the film making machine.

[0010] A relief gas outlet can be provided at any position of the pipeline.

[0011] A fresh gas supply port can be set at any position of the pipeline.

[0012] Compared with the prior art, the beneficial effects and advantages of the utility model are:

[0013] 1. The device is equipped with a heat exchanger to recover the heat of the hot exhaust gas from the film making machine drying tunnel. The recovered heat energy is used to preliminarily heat the exhaust gas after condensing and recovering the organic solvent. The preliminarily heated exhaust gas passes through the heater and circulates into the film making machine drying tunnel for drying. This method can not only recycle the heat energy of the hot exhaust gas from the film making machine drying tunnel and reduce the energy consumption of the film making machine drying, but also make the exhaust gas always circulate in a closed environment, so as not to generate exhaust gas and cause pollution to the environment.

[0014] 2. The device is equipped with a condenser to condense the organic solvent in the tail gas into liquid, and then recover and reuse the liquid organic solvent, further reducing the loss of organic solvent in the membrane preparation process.

[0015] 3. The device also recycles the organic solvent at the heat exchange point, thereby maximizing the recovery of the organic solvent. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the structure of an environmentally friendly film-making device for exhaust gas recycling.

[0017] Among them, 1-film making machine; 2-exhaust outlet pipe; 3-heat exchanger: 301-shell shell, 302-shell inlet, 303-shell outlet, 304-tube inlet, 305-tube outlet, 306-second liquid outlet; 4-second collecting pipe; 5-second collecting tank; 6-condensation inlet pipe; 7-condenser: 701-gas inlet, 702-first liquid outlet, 703-gas outlet; 8-first collecting pipe; 9-first collecting tank; 10-condensation outlet pipe; 11-heating inlet pipe; 12-air heater; 13-free radical scavenging tank; 14-circulation pipe: 1401-first circulation branch pipe, 1402-second circulation branch pipe. DETAILED DESCRIPTION

[0018] The utility model is described in detail below in conjunction with the accompanying drawings.

[0019] The structure of the environmentally friendly film-making device for recycling tail gas provided in this embodiment is as follows: Figure 1 As shown, the film making machine 1 includes a tail gas outlet pipe 2, a heat exchange unit, a condensation air inlet pipe 6, a condensation unit, a condensation air outlet pipe 10, a heating air inlet pipe 11, an air heater 12, a circulation pipe 14 and a free radical scavenging tank 13. The film making machine 1 can be a casting machine.

[0020] The heat exchange unit includes a heat exchanger 3, a second liquid collecting pipe 4 and a second liquid collecting tank 5. The heat exchanger 3 is a single-pass shell and tube heat exchanger, and the heat exchanger 3 has a shell side shell 301, a shell side inlet 302, a shell side outlet 303, a tube side inlet 304 and a tube side outlet 305. The inlet of the tail gas outlet pipe 2 is connected to the exhaust port of the drying tunnel of the film making machine 1, and the outlet of the tail gas outlet pipe 2 is connected to the shell side inlet 302. The tail gas from the drying tunnel of the film making machine 1 is high-temperature tail gas, and the high-temperature tail gas is heat-exchanged through the heat exchanger, thereby realizing the reuse of the heat of the high-temperature tail gas, and also avoiding direct condensation of the high-temperature tail gas, thereby reducing the condensation energy consumption.

[0021] A second liquid outlet 306 is provided at the bottom of the shell shell 301. The second liquid collecting tank 4 is located directly below the shell shell 301. The second liquid collecting tank 5 is a closed container. A liquid outlet (not shown) is provided at the bottom of the second liquid collecting tank 5. A liquid valve (not shown) is provided on the liquid outlet. The upper end of the second liquid collecting pipe 4 is connected to the second liquid outlet 306. The second liquid collecting pipe 4 is sealed and penetrates the top of the second liquid collecting tank 5. The lower end of the second liquid collecting pipe 4 is located in the second liquid collecting tank 5. The high-temperature exhaust gas from the drying channel of the film making machine 1 will also be preliminarily condensed during the heat exchange process, and a small amount of organic solvent will also be condensed into liquid, which will be recycled and reused through the second liquid outlet 306 of the shell shell.

[0022] The heat exchange unit includes a condenser 7, a first liquid collecting pipe 8 and a first liquid collecting tank 9. The condenser 7 is provided with a gas inlet 701, a first liquid outlet 702 and a gas outlet 703. The inlet of the condensing air inlet pipe 6 is connected to the shell outlet 303, and the outlet of the condensing air inlet pipe 6 is connected to the gas inlet 701. The first liquid collecting tank 9 is a closed container. The bottom of the first liquid collecting tank 9 is provided with a liquid outlet (not shown), and the liquid outlet is provided with a liquid valve (not shown). The first liquid outlet 703 is located at the bottom of the condenser 7, and the first liquid collecting tank 9 is located directly below the condenser 7. The upper end of the first liquid collecting pipe 8 is connected to the first liquid outlet 703, the first liquid collecting pipe 8 is sealed and passes through the top of the first liquid collecting tank 9, and the lower end of the first liquid collecting pipe 8 is located in the first liquid collecting tank 9. After heat exchange, the high-temperature exhaust gas enters the condenser 7 for condensation. By setting the temperature of the condenser 7 to below the boiling point of the organic solvent to be recovered, the gaseous organic solvent becomes liquid after condensation, and the liquid organic solution flows from the bottom of the condenser into the first liquid collecting tank 9 for recovery and reuse.

[0023] The inlet of the condensation outlet pipe 10 is connected to the gas outlet 703, and the outlet of the condensation outlet pipe 10 is connected to the tube side inlet 304. The tube side outlet 305 is connected to the inlet of the heating inlet pipe 11, and the outlet of the heating inlet pipe 11 is connected to the inlet of the air heater 12. The exhaust gas is cooled by the condenser 7 and the temperature is further reduced. It needs to be reheated and circulated into the drying tunnel of the film making machine 1 to dry the film. Therefore, before heating, it enters the heat exchanger 3 for heat exchange preheating, and the preheated exhaust gas enters the air heater 12 for heating, which can reduce the energy consumption of heating.

[0024] The free radical scavenging tank 13 is a sealed container, and the free radical scavenging tank 13 contains a free radical scavenger. The free radical scavenger includes but is not limited to phenolic compounds, aromatic nitro compounds, quinone compounds, cuprous chloride, ferric chloride, sodium sulfate, sodium sulfide, and ammonium thiocyanate. During the continuous circulation of the tail gas, the organic gas in the tail gas may generate free radicals, and if the free radicals are not scavenged, an explosion may occur.

[0025] The circulation pipe 14 includes a first circulation branch pipe 1401 and a second circulation branch pipe 1402. The inlet of the first circulation branch pipe 1401 is connected to the outlet of the air heater 12. The first circulation branch pipe 1401 and the second circulation branch pipe 1402 are respectively sealed and penetrate the free radical scavenging tank 13. The outlet of the first circulation branch pipe 1401 is located below the liquid level of the free radical scavenger, and the inlet of the second circulation branch pipe 1402 is located above the liquid level of the free radical scavenger. The outlet of the second circulation branch pipe 1402 is connected to the drying channel of the film making machine 1. The heated exhaust gas is again passed through the drying channel of the film making machine 1 to dry the film, and the exhaust gas is recycled, and no exhaust gas is discharged, which will not cause environmental pollution.

[0026] The condensation outlet pipe 10 is provided with a relief gas outlet (not shown) to avoid the risk of excessive gas pressure in the pipeline during long-term operation, which may cause the equipment to not operate normally.

[0027] A fresh gas supply port (not shown) is provided on the tail gas outlet pipe 2 for replenishing fresh gas such as inert gas, air, carbon dioxide and the like.

Claims

1. An environmentally friendly film-making device for recycling tail gas, comprising a film-making machine, characterized in that: It also includes an exhaust gas outlet pipe, a heat exchange unit, a condensation air inlet pipe, a condensation unit, a condensation air outlet pipe, a heater and a circulation pipe. The heat exchange unit includes a heat exchanger, and the heat exchanger includes at least a first flow channel and a second flow channel. The condensation unit includes a condenser, a first collecting pipe and a first collecting tank. The condenser is provided with a gas inlet, a first liquid outlet and a gas outlet. One end of the first collecting pipe is connected to the first liquid outlet, and the other end of the first collecting pipe is connected to the first collecting tank. The inlet of the exhaust gas outlet pipe is connected to the exhaust port of the film making machine drying channel, and the outlet of the exhaust gas outlet pipe is connected to the inlet of each first flow channel, the inlet of the condensation air inlet pipe is connected to each first flow channel outlet, the outlet of the condensation air inlet pipe is connected to the gas inlet, the inlet of the condensation air outlet pipe is connected to the gas outlet, the outlet of the condensation air outlet pipe is connected to the inlet of the heater, the inlet of the circulation pipe is connected to the outlet of the heater, and the outlet of the circulation pipe is connected to the drying channel of the film making machine.

2. The environmentally friendly film-making device for recycling tail gas according to claim 1, characterized in that: The heat exchange unit also includes a second liquid collecting pipe and a second liquid collecting tank. The heat exchanger is a single-pass shell and tube heat exchanger. The heat exchanger has a shell inlet and a shell outlet. The tail gas outlet is connected to the shell inlet, the condensation inlet is connected to the shell outlet, and a second liquid outlet is provided at the bottom of the shell shell. One end of the second liquid collecting pipe is connected to the second liquid outlet, and the other end of the second liquid pipe is connected to the second liquid collecting tank.

3. The environmentally friendly film-making device for recycling tail gas according to claim 1, characterized in that: It also includes a heating air inlet pipe. The heat exchanger also has a tube inlet and a tube outlet. The condensing air outlet pipe outlet is connected to the tube inlet, the tube outlet is connected to the heating air inlet pipe inlet, and the heating air inlet pipe outlet is connected to the heater inlet.

4. The environmentally friendly film-making device for recycling tail gas according to claim 1, characterized in that: It also includes a free radical scavenging tank, which contains a free radical scavenger. The circulation pipe includes a first circulation branch pipe and a second circulation branch pipe. The inlet of the first circulation branch pipe is connected to the outlet of the heater. The first circulation branch pipe and the second circulation branch pipe are respectively fixed and penetrate the free radical scavenging tank. The outlet of the first circulation branch pipe is located inside the free radical scavenger, the inlet of the second circulation branch pipe is located above the free radical scavenger, and the outlet of the second circulation branch pipe is connected to the drying tunnel of the film making machine.

5. The environmentally friendly film-making device for recycling tail gas according to claim 1, characterized in that: A relief gas outlet can be provided at any position of the pipeline.

6. The environmentally friendly film-making device for recycling tail gas according to claim 1, characterized in that: A fresh gas supply port can be set at any position of the pipeline.

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