Door opening air purification and regeneration system of dry cleaning machine

Abstract

The invention relates to the technical field of dry cleaning machines, in particular to a dry cleaning machine door opening air purification and regeneration system which comprises a negative pressure gas capturing device and a carbon adsorber, the gas capturing device comprises a negative pressure gas suction port, a negative pressure gas suction channel and a catalytic device, and the negative pressure gas suction port is formed in the circumferential direction of a door frame of a dry cleaning machine; the negative-pressure air suction channel is communicated with the negative-pressure air suction port and the catalytic device, the catalytic device is communicated with the carbon adsorber through an air pipeline, a steam heating pipe, an electric heating pipe, a heat pump and a cold pump are arranged in the catalytic device, and through multi-stage temperature regulation (condensation and heating), the treatment effect on gaseous tetrachloroethylene is remarkably improved; the stainless steel container is filled with granular activated carbon powder, has high specific surface area and good adsorption performance, and can effectively adsorb gaseous tetrachloroethylene, so that the concentration of the tetrachloroethylene in the barrel is reduced to 2g / m < 3 > or below.

Description

Technical Field

[0001] The present invention relates to the technical field of dry cleaning machines, in particular to a door-opening air purification and regeneration system for dry cleaning machines. Background Art

[0002] In the dry cleaning industry, organic solvents (such as tetrachloroethylene (PCE)) are widely used for cleaning and care of clothing due to their excellent cleaning ability and rapid volatility. However, after the dry cleaning machine completes the wash cycle, the door must be frequently opened to remove and load clothes. During this time, the gaseous PCE solvent remaining in the machine can quickly escape into the external environment with the air flow. According to research statistics, a single door opening operation can result in direct emissions of 15%-25% of PCE, the main hazards of which are:

[0003] Environmental pollution: PCE is a volatile organic compound (VOCs). After entering the atmosphere, it participates in photochemical reactions and generates secondary pollutants such as ozone.

[0004] Health risks: PCE is classified as a Class 2A carcinogen by the International Agency for Research on Cancer (IARC). Long-term exposure can cause central nervous system damage, liver and kidney toxicity, and other problems (OSHA stipulates that the PCE exposure limit is 25ppm, but traditional dry cleaning workshops often exceed the limit);

[0005] Waste of resources: Unrecycled solvents need to be frequently replenished, increasing operating costs (solvent costs account for 30%-40% of the total cost of a dry cleaner).

[0006] Limitations of existing technologies

[0007] The dry cleaning equipment currently on the market has the following defects in air purification and solvent recovery:

[0008] Inefficient air purification system:

[0009] Traditional equipment uses mechanical filtration or activated carbon adsorption, which can only intercept particulate matter or adsorb a small amount of gaseous solvents (efficiency ≤ 50%) and cannot completely decompose harmful substances such as PCE;

[0010] Due to the lack of negative pressure capture design, the escaped gas is not collected in a targeted manner when the door is opened, rendering the purification device useless.

[0011] Imperfect solvent recovery technology:

[0012] The condensation recovery method can only process liquid PCE, and the recovery rate of gaseous solvent is less than 40%;

[0013] The activated carbon in the adsorption-regeneration system is easily saturated (adsorption capacity ≤ 300 mg / g), and regeneration requires high temperature (≥ 200°C) or steam purge, which has high energy consumption and low regeneration efficiency (≤ 60%).

[0014] Insufficient environmental compliance:

[0015] The PCE emission concentration of existing equipment is generally higher than 50ppm, far exceeding the EU EN 60335-2-113 standard (which requires an emission concentration of ≤20ppm);

[0016] Solvent closed-loop regeneration is not achieved, and a large amount of VOCs are directly discharged into the atmosphere.

[0017] In recent years, some improvement schemes have attempted to degrade PCE through catalytic oxidation or photocatalytic decomposition technology, but the following problems still exist:

[0018] Precipitated impurities are easily deactivated: PCE decomposition requires high temperatures (280-320°C), but traditional electric heating methods cause precipitated impurities (such as Pt / Al2O3) to sinter and become inactivated due to local overheating;

[0019] High energy consumption and cost: Photocatalysis requires continuous energy supply from ultraviolet light sources, increasing equipment maintenance costs by more than 50%;

[0020] Regeneration system is disconnected: the purified gas is not integrated with the solvent regeneration process, making it impossible to reuse resources. Summary of the Invention

[0021] (1) Technical problems solved

[0022] In view of the deficiencies in the prior art, the present invention provides a dry cleaning machine door-opening air purification and regeneration system.

[0023] (2) Technical solution

[0024] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: The dry cleaning machine door-opening air purification and regeneration system of the present invention includes a negative pressure gas capture device and a carbon adsorber, the gas capture device includes a negative pressure air intake port, a negative pressure air intake channel and a catalytic device, the negative pressure air intake port is arranged around the door frame of the dry cleaning machine, the negative pressure air intake channel is connected with the negative pressure air intake port and the catalytic device, the catalytic device is connected with the carbon adsorber through an air duct, the carbon adsorber includes a stainless steel container and a wound heating tube, the wound heating tube is arranged in the stainless steel container, activated carbon powder is provided in the stainless steel container, a guide device is provided on the stainless steel container, the guide device is used to introduce the regenerated gaseous tetrachloroethylene analyzed by the carbon adsorber into the dry cleaning machine.

[0025] Preferably, an air inlet is provided at one end of the catalytic device, an air duct ciliary blue is provided on the air inlet, a driving motor is provided at the other end of the catalytic device, a turbine is installed at the output end of the driving motor, and the turbine is located inside the catalytic device, a steam heating pipe, an electric heating pipe, a heat pump and a cold pump are arranged inside the catalytic device, one end of the air duct is connected to one end of the catalytic device where the turbine is provided, and the other end of the air duct is connected to the bottom of the stainless steel container.

[0026] Further preferably, the guide device includes a circulation box, a circulation pipe 1, a circulation pipe 2, a drive motor 2 and a carbon adsorption fan, the circulation pipe 1 is connected to the circulation box and the top of the stainless steel container, the circulation pipe 2 is connected to the circulation box, and the circulation pipe 2 is located opposite to the circulation pipe 1, the drive motor 2 is fixedly installed on the top of the circulation box, the carbon adsorption fan is installed at the output end of the drive motor 2, and the carbon adsorption fan is located in the circulation box, and the circulation pipe 2 is used to connect to the dry cleaning machine.

[0027] Again preferably, a button collector is provided on the negative pressure suction channel, the button collector is communicated with the negative pressure suction channel, and the button collector is used to collect precipitated impurities.

[0028] Preferably, the button collector is provided with a circulation channel connected to the top end of the negative pressure suction channel.

[0029] More preferably, it further includes a solvent oil sedimentation box, in which an adsorption solvent is provided. The solvent oil sedimentation box is connected to the bottom of the air pipe through a buffer pipe, and a valve is provided on the buffer pipe.

[0030] Again preferably, a gas sensor is installed at the output end of the catalytic device.

[0031] (3) Beneficial effects

[0032] Compared with the prior art, the present invention provides a dry cleaning machine door opening air purification and regeneration system, which has the following beneficial effects:

[0033] Efficient purification

[0034] Negative pressure gas capture device

[0035] All-round capture: The negative pressure air intake is arranged around the door frame of the dry cleaning machine, which can capture the gaseous tetrachloroethylene that escapes when the door is opened in all directions, preventing it from entering the atmosphere and polluting the air.

[0036] Filtering oversized impurities: The button collector on the negative pressure suction channel is used to collect precipitated impurities. It can filter larger impurities such as buttons and keys before the gas enters the catalytic device, reducing the burden of subsequent processing.

[0037] Catalytic device

[0038] Multi-stage temperature regulation: Steam heating tubes, electric heating tubes, heat pumps and cold pumps are arranged inside the catalytic device. Through multi-stage temperature regulation (condensation and heating), the treatment effect of gaseous tetrachloroethylene is significantly improved.

[0039] Supercharging effect: A turbine is installed at the output end of the drive motor, located inside the catalytic device, to increase the gas flow rate and enhance the processing efficiency.

[0040] Carbon adsorber

[0041] High-efficiency adsorption: The stainless steel container is filled with granular activated carbon powder, which has a high specific surface area and good adsorption performance. It can effectively adsorb gaseous tetrachloroethylene and reduce the concentration of tetrachloroethylene in the cylinder to 2g / m 3 the following.

[0042] Desorption function: The wound heating tube is heated by steam source or electric heating to desorb the tetrachloroethylene adsorbed on the activated carbon powder, thereby realizing the regeneration and recycling of the solvent.

[0043] Solvent regeneration and recycling

[0044] guide device

[0045] Introduction of regenerated gaseous tetrachloroethylene: The guiding device includes a circulation box, a circulation pipe 1, a circulation pipe 2, a driving motor 2 and a carbon adsorption fan, which introduces the regenerated gaseous tetrachloroethylene into the dry cleaning machine to achieve solvent regeneration and recycling, reduce solvent waste and lower operating costs.

[0046] Solvent oil sedimentation tank

[0047] Further absorption: The solvent oil sedimentation box is equipped with an adsorption solvent to further absorb the gaseous tetrachloroethylene that has not been completely treated, thereby improving the overall purification effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 This is a schematic diagram of the purification and regeneration process of the present invention;

[0049] Figure 2 This is a table of working parameters of the catalytic device of the present invention;

[0050] Figure 3 This is a table of technical advantages of the present invention;

[0051] In the figure: 1. Catalytic device; 2. Negative pressure suction channel; 3. Negative pressure suction port; 4. Cold pump; 5. Heat pump; 6. Electric heating tube; 7. Steam heating tube; 8. Driving motor 1; 9. Turbine; 10. Air duct cilia blue; 11. Stainless steel container; 12. Winding heating tube; 13. Circulation box; 14. Driving motor 2; 15. Carbon adsorption fan; 16. Circulation pipe 1; 17. Circulation pipe 2; 18. Button collector; 19. Circulation channel; 20. Precipitated impurities; 21. Solvent oil sedimentation box; 22. Cache pipe; 23. Air pipe; 24. Gas sensor. DETAILED DESCRIPTION

[0052] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0053] See also Figure 1-3 The dry cleaning machine door opening air purification and regeneration system of the present invention includes a negative pressure gas capture device and a carbon adsorber. The gas capture device includes a negative pressure air intake port 3, a negative pressure air intake channel 2 and a catalytic device 1. The negative pressure air intake port 3 is arranged around the door frame of the dry cleaning machine. The negative pressure air intake channel 2 is connected to the negative pressure air intake port 3 and the catalytic device 1. The catalytic device 1 is connected to the carbon adsorber through an air duct 23. The carbon adsorber includes a stainless steel container 11 and a wound heating tube 12. The wound heating tube 12 is arranged in the stainless steel container 11. Activated carbon powder is provided in the stainless steel container 11. A guide device is provided on the stainless steel container 11. The guide device is used to introduce the regenerated gaseous tetrachloroethylene analyzed by the carbon adsorber into the dry cleaning machine.

[0054] The dry cleaning machine door air purification and regeneration system effectively treats gaseous tetrachloroethylene (PCE) mixed air through the combined use of multiple components such as a negative pressure gas capture device, a carbon adsorber, and a catalytic device 1. The system includes key components such as a negative pressure air intake port 3, a negative pressure air intake channel 2, a catalytic device 1, and a carbon adsorber, ensuring that the concentration of PCE in the cylinder is reduced to 2g / m 3 The following is to realize the regeneration and recycling of solvent.

[0055] Negative pressure gas capture device

[0056] structure

[0057] Negative pressure suction port 3: arranged around the door frame of the dry cleaning machine, used to capture gaseous tetrachloroethylene that escapes when the door is opened.

[0058] Negative pressure suction channel 2: connected to the negative pressure suction port 3, guiding the captured gaseous tetrachloroethylene to the catalytic device 1.

[0059] Button collector 18: arranged on the negative pressure suction channel 2, used for collecting precipitated impurities 20 and for filtering larger impurities such as buttons and keys.

[0060] Circulation channel 19: communicates with the top of the negative pressure suction channel 2 to further optimize the gas flow path.

[0061] Catalytic device 1

[0062] structure

[0063] Air inlet: An air inlet is provided at one end of the catalytic device 1, and an air channel ciliary basket 10 is provided on the inlet for filtering impurities in the air.

[0064] Driving motor 8: A driving motor 8 is provided at the other end of the catalytic device 1 , and a turbine 9 is installed at its output end, which is located inside the catalytic device 1 .

[0065] Heating and cooling equipment: The catalytic device 1 is internally provided with a steam heating pipe 7, an electric heating pipe 6, a heat pump 5 and a cold pump 4 for regulating the gas temperature.

[0066] Gas sensor 24: A gas sensor 24 is installed at the output end of the catalytic device 1 to monitor the quality of the treated gas in real time.

[0067] The driving motor 8 drives the turbine 9 to rotate at high speed, forming a local negative pressure (pressure difference ≥ 5kPa) at the circumferential air intake of the door frame, with a speed of 15-20m 3 / min flow rate forcibly sucks out the escaping gas.

[0068] The air intake adopts a 30°-45° tilt design, covering the entire circumference of the door frame to ensure a gas capture rate of ≥95%.

[0069] Gas flow path

[0070] The escaped gas enters the button collector 18 through the negative pressure suction channel 2, and the built-in Pt-Pd precipitated impurities 20 (loading amount 1.5-2.0wt%) preliminarily decomposes PCE into CO2 and Cl2 (decomposition rate ≥50%).

[0071] The working parameters of the catalytic device 1 are as follows: Figure 2 shown.

[0072] Carbon adsorber

[0073] structure

[0074] Stainless steel container 11: The carbon adsorber is composed of a stainless steel container 11, which has good corrosion resistance and mechanical strength.

[0075] Activated carbon powder: The stainless steel container 11 is filled with granular activated carbon powder, which has a high specific surface area and good adsorption performance.

[0076] Winding heating tube 12: The heating tube wound with a copper tube is arranged in the stainless steel container 11 and is heated by a steam source or electric heating for desorption operation.

[0077] The guiding device includes a circulation box 13, a circulation pipe 1 16, a circulation pipe 2 17, a driving motor 2 14 and a carbon adsorption fan 15, and is used to guide the regenerated gaseous tetrachloroethylene into the dry cleaning machine.

[0078] Carbon adsorption residue purification

[0079] The gas enters the carbon adsorber after catalytic decomposition, and the activated carbon (specific surface area ≥ 1200m 2 / g) adsorbs residual organic matter, and the outlet concentration is ≤50ppm.

[0080] Winding heating tube 12 (power 2-3kW / m 3 ) Heating to 120-150℃, desorbing PCE adsorbed by activated carbon, regeneration efficiency ≥90%

[0081] Solvent oil sedimentation tank 21

[0082] structure

[0083] Solvent oil sedimentation tank 21: It is provided with an adsorption solvent for further absorbing the gaseous tetrachloroethylene that has not been completely treated. The solvent oil sedimentation tank 21 can be conventionally provided with a liquid injection pipe and a liquid discharge pipe. The adsorption solvent (such as silica gel) temporarily stores the recovered liquid PCE and releases it to the washing system as needed to reduce solvent waste.

[0084] Buffer pipe 22: connects the solvent oil sedimentation tank 21 and the bottom of the air pipe 23. A valve is provided on the buffer pipe 22 to control the inflow of the solvent.

[0085] Detailed workflow, the technical advantages of this technical solution are as follows Figure 3 As shown:

[0086] End of dry cleaning process:

[0087] After the dry cleaning process is completed, when the infrared sensor or pressure sensor detects that the door of the dry cleaning machine is open, the negative pressure gas capture device is automatically started.

[0088] Negative pressure gas capture stage:

[0089] When the door is opened, the driving motor 8 of the catalytic device 1 starts to drive the turbine to generate negative pressure, and the escaped gaseous tetrachloroethylene is captured through the negative pressure air channel and the negative pressure air intake 3.

[0090] Larger precipitated impurities, such as buttons and keys, are filtered and enter the button collector 18 through the negative pressure suction channel 2.

[0091] The gas after preliminary treatment continues to pass through the negative pressure air intake channel 2 and finally enters the catalytic device 1.

[0092] Catalytic device 1 treatment stage:

[0093] Air enters the catalytic device 1 from the air inlet and is pressurized by the turbine 9 to increase the gas flow rate.

[0094] In the catalytic device 1, the gas passes through the cold pump 4 and the heat pump 5 in sequence for temperature adjustment. The cold pump 4 lowers the gas temperature to condense part of the gaseous tetrachloroethylene into liquid; the heat pump 5 raises the gas temperature in preparation for subsequent treatment.

[0095] The temperature-regulated gas further passes through the steam heating tube 7 and the electric heating tube 6 to further treat the incompletely condensed gaseous tetrachloroethylene.

[0096] The treated gas is detected by the gas sensor 24 to ensure that it meets the emission standards, and then transmitted to the carbon adsorber through the air pipe 23.

[0097] Carbon adsorption stage:

[0098] The gas treated by the catalytic device 1 enters the carbon adsorber through the air pipe 23. The activated carbon powder adsorbs the gaseous tetrachloroethylene, reducing the concentration of tetrachloroethylene in the cylinder to 2g / m 3 the following.

[0099] When the carbon adsorber is close to saturation, the control system starts the heating tube and heats the carbon adsorber through a steam source or electric heating to desorb the tetrachloroethylene adsorbed on the activated carbon powder.

[0100] Regeneration and recycling stage:

[0101] The desorbed gaseous tetrachloroethylene is introduced into the dry cleaning machine through a guide device (circulation box 13, circulation pipe 1 16 and circulation pipe 2 17) to achieve solvent regeneration and recycling.

[0102] The treated gas enters the solvent oil settling tank 21 through the air pipe 23, and the adsorption solvent further absorbs the incompletely treated gaseous tetrachloroethylene.

[0103] The valve on the cache pipe 22 can be opened or closed as needed to ensure stable system operation.

[0104] The infrared sensor, pressure sensor, gas sensor 24 and various electrical components in this technical solution can be configured with a PLC programming controller as a control system for operation.

[0105] Working principle of the optimal technical solution

[0106] Optimization of negative pressure gas capture device

[0107] Optimization points

[0108] Layout of negative pressure air intake port 3: Negative pressure air intake port 3 is arranged around the door frame of the dry cleaning machine to ensure that the escaped gaseous tetrachloroethylene is captured in all directions.

[0109] Button collector 18: The button collector 18 is provided with precipitated impurities 20 for preliminary decomposition of part of the gaseous tetrachloroethylene to reduce the burden of subsequent processing.

[0110] Circulation channel 19: connected to the top of the negative pressure suction channel 2, further optimizing the gas flow path and improving the capture efficiency.

[0111] Optimization of Catalytic Device 1

[0112] Optimization points

[0113] Driving motor 8 and turbine 9: The output end of driving motor 8 is equipped with turbine 9, which is located inside the catalytic device 1 to increase the gas flow rate and enhance the treatment effect.

[0114] Combination of heating and cooling equipment: The catalytic device 1 is internally provided with a steam heating pipe 7, an electric heating pipe 6, a heat pump 5 and a cooling pump 4, and the gas temperature is adjusted at multiple levels to ensure thorough treatment.

[0115] Gas sensor 24: A gas sensor 24 is installed at the output end of the catalytic device 1 to monitor the quality of the treated gas in real time to ensure that it meets the emission standards.

[0116] Optimization of carbon adsorber

[0117] Optimization points

[0118] Stainless steel container 11 and activated carbon powder: The stainless steel container 11 is filled with granular activated carbon powder, which has a high specific surface area and good adsorption performance to ensure efficient adsorption.

[0119] Winding heating tube 12: The heating tube wound with a copper tube is arranged in the stainless steel container 11 and is heated by a steam source or electric heating to ensure the desorption effect.

[0120] The guiding device includes a circulation box 13, a circulation pipe 1 16, a circulation pipe 2 17, a driving motor 2 14 and a carbon adsorption fan 15, which guides the regenerated gaseous tetrachloroethylene into the dry cleaning machine to achieve the regeneration and recycling of the solvent.

[0121] Optimization of solvent oil sedimentation tank 21

[0122] Optimization points

[0123] Adsorption solvent: The solvent oil sedimentation tank 21 is provided with an adsorption solvent to further absorb the gaseous tetrachloroethylene that has not been completely treated, thereby improving the purification effect.

[0124] Cache pipe 22 and valve: The cache pipe 22 connects the solvent oil sedimentation tank 21 and the bottom of the air pipe 23. A valve is provided on the cache pipe 22 to ensure stable operation of the system.

[0125] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. Dry cleaning machine door opening air purification and regeneration system, characterized by: The invention comprises a negative pressure gas capture device and a carbon adsorber, wherein the gas capture device comprises a negative pressure air intake port (3), a negative pressure air intake channel (2) and a catalytic device (1), wherein the negative pressure air intake port (3) is arranged on the circumference of the door frame of the dry cleaning machine, the negative pressure air intake channel (2) is connected with the negative pressure air intake port (3) and the catalytic device (1), and the catalytic device (1) is connected with the carbon adsorber through an air duct (23), and the carbon adsorber comprises a stainless steel container (11) and a wound heating tube (12), wherein the wound heating tube (12) is arranged in the stainless steel container (11), wherein activated carbon powder is arranged in the stainless steel container (11), and a guide device is provided on the stainless steel container (11), wherein the guide device is used to introduce the regenerated gaseous tetrachloroethylene after the carbon adsorber is analyzed into the dry cleaning machine.

2. The dry cleaning machine door opening air purification and regeneration system according to claim 1, characterized in that: One end of the catalytic device (1) is provided with an air inlet, and the air inlet is provided with an air duct ciliary blue (10). The other end of the catalytic device (1) is provided with a driving motor (8), and the output end of the driving motor (8) is installed with a turbine (9), and the turbine (9) is located inside the catalytic device (1). The interior of the catalytic device (1) is arranged with a steam heating pipe (7), an electric heating pipe (6), a heat pump (5) and a cold pump (4). One end of the air pipe (23) is connected to the end of the catalytic device (1) where the turbine (9) is provided, and the other end of the air pipe (23) is connected to the bottom of the stainless steel container (11).

3. The dry cleaning machine door opening air purification and regeneration system according to claim 2, characterized in that: The guide device includes a circulation box (13), a circulation pipe 1 (16), a circulation pipe 2 (17), a drive motor 2 (14) and a carbon adsorption fan (15). The circulation pipe 1 (16) is connected to the circulation box (13) and the top of the stainless steel container (11). The circulation pipe 2 (17) is connected to the circulation box (13), and the circulation pipe 2 (17) is located opposite to the circulation pipe 1 (16). The drive motor 2 (14) is fixedly installed on the top of the circulation box. The carbon adsorption fan (15) is installed at the output end of the drive motor 2 (14), and the carbon adsorption fan (15) is located in the circulation box (13). The circulation pipe 2 (17) is used to connect to the dry cleaning machine.

4. The dry cleaning machine door opening air purification and regeneration system according to claim 3, characterized in that: A button collector (18) is provided on the negative pressure suction channel (2), the button collector (18) is in communication with the negative pressure suction channel (2), and the button collector (18) is used to collect precipitated impurities (20).

5. The dry cleaning machine door opening air purification and regeneration system according to claim 4, characterized in that: The button collector (18) is provided with a circulation channel (19) which is in communication with the top end of the negative pressure suction channel (2).

6. The dry cleaning machine door opening air purification and regeneration system according to claim 5, characterized in that: The invention also comprises a solvent oil precipitation box (21), wherein an adsorption solvent is provided in the solvent oil precipitation box (21), and the solvent oil precipitation box (21) is connected to the bottom of the air pipe (23) through a buffer pipe (22), and a valve is provided on the buffer pipe (22).

7. The dry cleaning machine door opening air purification and regeneration system according to claim 6, characterized in that: A gas sensor (24) is installed at the output end of the catalytic device (1).

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