Rotary centrifugal DMF (Dimethyl Formamide) gas recovery device

Abstract

The utility model discloses a rotary centrifugal type DMF (Dimethyl Formamide) gas recovery device, which relates to the technical field of DMF gas recovery, and specifically comprises a separation structure and a rectification structure, the separation structure comprises a cyclone cylinder, the air inlet end of the cyclone cylinder is fixedly connected with an air inlet pipe, a water spray pipe is fixed in the middle of the inner cavity of the air inlet pipe, and the water spray pipe is fixedly connected with a water outlet of the cyclone cylinder; one end of the water spraying pipe extends out of the air inlet pipe, an exhaust pipe is fixedly connected to the middle of the top of the cyclone barrel, and a dehumidification structure is arranged at the top end of an inner cavity of the exhaust pipe. According to the rotary centrifugal DMF gas recovery device, through the arrangement of the separation structure, when the separation structure is used, waste gas containing DMF gas and water can rotate in the cyclone cylinder and make full contact, the dissolving efficiency of the DMF gas in the waste gas is improved, under the action of centrifugal force, residual gas and water can be rapidly separated, rapid discharging of the residual gas is facilitated, and the recovery efficiency of the DMF gas is improved. And the water film and the water absorption strip can be used for recycling water in residual gas, so that the water loss is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of DMF gas recovery, in particular to a rotary centrifugal DMF gas recovery device. Background Art

[0002] DMF is an organic compound, namely N,N-dimethylformamide. It is a very common solvent and is often used in industries such as medicine, printing and dyeing, ink, and leather. It is not only a chemical raw material with a wide range of uses, but also an excellent solvent with a wide range of uses. It can be mixed with water and most organic solvents at will, and has good solubility for a variety of organic and inorganic compounds. Therefore, when recovering DMF gas, considering the economic efficiency during recovery, the waste gas containing DMF gas is usually passed into a water body. However, if the waste gas is directly passed into water, the contact surface between DMF gas and water is small, which affects the dissolution efficiency of DMF gas. The temperature of DMF gas is relatively high, and after DMF gas is passed into water, a part of the water will evaporate, increasing the water consumption of the recovery device, and the obtained aqueous solution needs to be processed again with other equipment, which is relatively troublesome. Based on this, the present application proposes a rotary centrifugal DMF gas recovery device. Utility Model Content

[0003] The utility model provides a rotary centrifugal DMF gas recovery device, which solves the problems proposed in the above background technology that waste gas containing DMF gas is directly passed into water to recover DMF, the contact area between DMF gas and water is small, which affects the dissolution efficiency of DMF gas; the DMF gas temperature is high, and after the DMF gas is passed into water, part of the water will evaporate, increasing the water consumption of the recovery device, and other equipment is needed to re-process the obtained aqueous solution, which is relatively troublesome.

[0004] The utility model provides the following technical solutions: a rotary centrifugal DMF gas recovery device, comprising a separation structure and a distillation structure, the separation structure comprising a cyclone cylinder, the air inlet end of the cyclone cylinder is fixedly connected to an air inlet pipe, a water spray pipe is fixed in the middle of the inner cavity of the air inlet pipe, one end of the water spray pipe extends to the outside of the air inlet pipe, the middle of the top of the cyclone cylinder is fixedly connected to an exhaust pipe, the top of the inner cavity of the exhaust pipe is provided with a dehumidification structure, the bottom end of the exhaust pipe extends to the bottom end of the inner cavity of the cyclone cylinder, the top of the inner cavity of the cyclone cylinder is fixedly connected to a water spray ring, the inner wall of the water spray ring is evenly provided with water spray holes, and the exhaust pipe is located in the middle of the inner cavity of the water spray ring; the distillation structure comprises a box body, the inner cavity of the box body is movably connected to a conveyor belt, the conveyor belt divides the inner cavity of the box body into an evaporation chamber, a heating chamber and a recovery chamber;

[0005] A partition plate is fixedly connected to one side of the inner cavity of the evaporation chamber, and the partition plate divides the inner cavity of the evaporation chamber into a temporary storage area and a steam area. A blanking port is provided in the middle of the top of the temporary storage area, and the discharge port of the cyclone cylinder is fixed to the top of the blanking port; a steam removal machine is provided on the top of the steam area, and the steam inlet end of the steam removal machine is located above the steam area; a first heating plate and a second heating plate are fixedly connected in the heating chamber, and the first heating plate and the second heating plate are both in contact with the bottom of the straight section on the conveyor belt, and the first heating plate and the second heating plate are both located below the steam area, and the steam discharge end of the steam removal machine is connected to the fluid inlet end of the first heating plate; a scraper plate is evenly fixedly connected to the top of the recovery chamber, and the top of the scraper plate is in contact with the bottom of the lower straight section of the conveyor belt, and a DMF liquid discharge pipe is provided on one side of the recovery chamber.

[0006] Preferably, a water inlet pipe is fixed to one side of the water spray ring, and the other end of the water inlet pipe extends to the outside of the cyclone cylinder.

[0007] Preferably, the dehumidification structure includes a limiting mesh plate fixedly connected to the inner cavity of the exhaust pipe, a water absorption strip placed on the top of the limiting mesh plate, a pressing mesh plate in contact with the top of the water absorption strip, and an electric telescopic rod fixedly connected to the top of the pressing mesh plate, the electric telescopic rod is fixedly connected to the inner wall of the exhaust pipe, and the pressing mesh plate is movably connected to the inner cavity of the exhaust pipe.

[0008] Preferably, a star-shaped discharge valve is provided at the discharge end of the cyclone cylinder.

[0009] Preferably, both ends of the inner cavity of the box are movably connected with synchronous rollers, a servo motor is fixedly connected to one side of the box, and the end of the output shaft of the servo motor is fixedly connected to the middle of the end of a synchronous roller; the two synchronous rollers are connected through a conveyor belt transmission, and the end of the conveyor belt close to the blanking port is in contact with the inner wall of the box, and a blanking gap is provided between the other end of the conveyor belt and the box.

[0010] Preferably, the bottom of the recovery chamber is inclined, and the DMF liquid discharge pipe is located at the lower end of the bottom of the recovery chamber.

[0011] Preferably, there is a separation gap between the bottom of the partition plate and the top of the conveyor belt; the temperature of the fluid entering the inner cavity of the first heating plate is lower than the temperature of the fluid entering the inner cavity of the second heating plate, and under standard atmospheric pressure, the temperature of the fluid in the inner cavity of the second heating plate is higher than 100°C but lower than 150°C.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. The rotary centrifugal DMF gas recovery device is provided with a separation structure. When the separation structure is in use, the waste gas containing DMF gas and water can rotate and fully contact in the cyclone body, thereby improving the dissolution efficiency of DMF gas in the waste gas. Under the action of centrifugal force, the residual gas and water can be quickly separated, which is convenient for the rapid discharge of the residual gas. The water film and the water absorption strip can be used to recover the water in the residual gas, thereby reducing water loss.

[0014] 2. The rotary centrifugal DMF gas recovery device, through the setting of the distillation structure, uses water vapor and high-temperature fluid to heat the water in turn, so that the water can evaporate, thereby realizing the separation of water and DMF solution. The generated water vapor can be used as a heat source to heat the aqueous solution on the conveyor belt, thereby reducing the energy loss of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a front view of the structure of the utility model;

[0016] Figure 2 For the utility model structure Figure 1 Schematic diagram on the left;

[0017] Figure 3 This is a schematic cross-sectional view of the cyclone cylinder structure of the utility model;

[0018] Figure 4 This is a cross-sectional schematic diagram of the exhaust pipe structure of the utility model;

[0019] Figure 5 This is a schematic diagram of the interior of the structural box of the utility model;

[0020] Figure 6 For the utility model structure Figure 5 Front view schematic diagram.

[0021] In the figure: 1. Cyclone cylinder; 2. Box body; 3. Air inlet pipe; 4. Water spray pipe; 5. Exhaust pipe; 6. Water inlet pipe; 7. Star-shaped unloading valve; 8. Steam removal machine; 9. High-temperature fluid discharge pipe; 10. Steam discharge pipe; 11. Servo motor; 12. Steam inlet pipe; 13. High-temperature fluid inlet pipe; 14. DMF liquid discharge pipe; 15. Water spray ring; 16. Electric telescopic rod; 17. Pressing screen; 18. Water absorption strip; 19. Limiting screen; 20. Dropping port; 21. Partition plate; 22. Conveyor belt; 23. Second heating plate; 24. First heating plate; 25. Scraper plate. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described 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.

[0023] The utility model provides a rotary centrifugal DMF gas recovery device, comprising a separation structure and a distillation structure. The separation structure comprises a cyclone barrel 1, an air inlet end of the cyclone barrel 1 being fixedly connected to an air inlet pipe 3, waste gas containing DMF gas can enter the cyclone barrel 1 through the air inlet pipe 3, and the waste gas performs a spiral motion in the cyclone barrel 1. A water spray pipe 4 is fixed in the middle of the inner cavity of the air inlet pipe 3, one end of the water spray pipe 4 extends to the outside of the air inlet pipe 3, waste gas containing DMF gas and water can enter the cyclone barrel 1 at the same time, and the waste gas and water perform a spiral motion in the cyclone barrel 1 together, so that the waste gas and water can fully contact each other, thereby improving the dissolution efficiency of the DMF gas in the waste gas, and under the action of centrifugal force, other water-insoluble components in the waste gas are separated from the aqueous solution.

[0024] An exhaust pipe 5 is fixedly connected to the middle part of the top of the cyclone cylinder 1, and the bottom end of the exhaust pipe 5 extends to the bottom end of the inner cavity of the cyclone cylinder 1. A water spray ring 15 is fixedly connected to the top of the inner cavity of the cyclone cylinder 1. The inner wall of the water spray ring 15 is evenly provided with water spray holes, and the exhaust pipe 5 is located in the middle of the inner cavity of the water spray ring 15. A water inlet pipe 6 is fixed to one side of the water spray ring 15, and the other end of the water inlet pipe 6 extends to the outside of the cyclone cylinder 1. Through the setting of the water spray ring 15, when water is injected into the inner cavity of the water spray ring 15 through the water inlet pipe 6, the water in the water spray ring 15 is sprayed on the outer wall of the exhaust pipe 5 through the water spray holes, so that a water film is formed on the outer wall of the exhaust pipe 5. When the separated gas contacts the water film, the water film can cool the water vapor in the gas and recover the water vapor. The residual DMF gas in the separated gas can continue to dissolve in water, thereby improving the recovery rate of the DMF gas. The excess gas in the cyclone cylinder 1 is discharged through the exhaust pipe 5.

[0025] A dehumidification structure is provided at the top of the inner cavity of the exhaust pipe 5. The dehumidification structure includes a limiting mesh plate 19 fixedly connected to the inner cavity of the exhaust pipe 5, a water absorption strip 18 placed on top of the limiting mesh plate 19, a pressing mesh plate 17 in contact with the top of the water absorption strip 18, and an electric telescopic rod 16 fixedly connected to the top of the pressing mesh plate 17. The electric telescopic rod 16 is fixedly connected to the inner wall of the exhaust pipe 5, and the pressing mesh plate 17 is movably connected to the inner cavity of the exhaust pipe 5. Due to the configuration of the dehumidification structure, excess gas in the cyclone barrel 1 needs to pass through the water absorption strip 18 during the discharge process. The water absorption strip 18 absorbs excess water in the gas, realizing water recovery and reducing water loss. The extension and retraction of the electric telescopic rod 16 can change the position of the pressing mesh plate 17. When the pressing mesh plate 17 presses the water absorption strip 18, the water absorbed in the water absorption strip 18 can be squeezed out, facilitating the reuse of the water absorption strip 18. The water absorption strip 18 can be made of a water-absorbing sponge.

[0026] From the above description, it can be seen that when the separation structure is in use, the exhaust gas and water can fully contact in the cyclone body, thereby improving the dissolution efficiency of DMF gas in the exhaust gas, and under the action of centrifugal force, the residual gas and water can be quickly separated, which is convenient for the rapid discharge of the residual gas, and the water film and the water absorption strip 18 can be used to recover the moisture in the residual gas, thereby reducing water loss.

[0027] A star-shaped discharge valve 7 is provided at the discharge end of the cyclone barrel 1. The provision of the star-shaped discharge valve 7 can prevent the gas in the cyclone barrel 1 from being discharged through the discharge port.

[0028] The distillation structure includes a housing 2, within which a conveyor belt 22 is movably connected. Synchronous rollers are movably connected at both ends of the housing 2. A servo motor 11 is fixedly connected to one side of the housing 2. The end of the servo motor 11's output shaft is fixedly connected to the middle of one synchronous roller via a reducer. The two synchronous rollers are connected by a transmission via the conveyor belt 22. The rotation of the servo motor 11 drives the connected synchronous rollers, which in turn drives the conveyor belt 22.

[0029] The conveyor belt 22 divides the inner cavity of the box body 2 into an evaporation chamber, a heating chamber and a recovery chamber; a partition plate 21 is fixedly connected to one side of the inner cavity of the evaporation chamber, and there is a separation gap between the bottom of the partition plate 21 and the top of the conveyor belt 22. The partition plate 21 can be used to control the thickness of the water on the conveyor belt 22. The separation gap can be set according to needs and is not limited here. The partition plate 21 divides the inner cavity of the evaporation chamber into a temporary storage area and a steam area. A drop port 20 is set in the middle of the top of the temporary storage area. The discharge port of the cyclone cylinder 1 is fixed to the top of the drop port 20; and the end of the conveyor belt 22 close to the drop port 20 is in contact with the inner wall of the box body 2, and a drop gap is set between the other end of the conveyor belt 22 and the box body 2. The size of the drop gap can be set according to needs and is not limited here. The aqueous solution discharged from the cyclone cylinder 1 can enter the temporary storage area through the drop port 20. During the rotation of the conveyor belt 22, part of the water is transported away by the conveyor belt 22.

[0030] A steam removal machine 8 is provided on the top of the steam zone. The steam inlet end of the steam removal machine 8 is located above the steam zone. The steam removal machine 8 can be used to discharge the water vapor generated in the steam zone, thereby facilitating the separation of water and DMF liquid.

[0031] A first heating plate 24 and a second heating plate 23 are fixedly connected in the heating chamber. The first heating plate 24 and the second heating plate 23 are both in contact with the bottom of the straight section on the conveyor belt 22. The first heating plate 24 and the second heating plate 23 are both located below the steam zone, and the steam discharge end of the steam removal machine 8 is connected to the fluid inlet end of the first heating plate 24. The steam discharged by the steam removal machine 8 can enter the inner cavity of the first heating plate 24, and the steam heats the liquid on the conveyor belt 22, thereby reducing the energy loss when the device is in use.

[0032] The temperature of the fluid entering the inner cavity of the first heating plate 24 is lower than the temperature of the fluid entering the inner cavity of the second heating plate 23, and under standard atmospheric pressure, the temperature of the fluid in the inner cavity of the second heating plate 23 is higher than 100°C but lower than 150°C. The fluid in the second heating plate 23 can be used to heat water, so that the water can evaporate, and the DMF liquid remains on the conveyor belt 22, thereby realizing the separation of the DMF liquid and water.

[0033] The fluid inlet end of the first heating plate 24 is fixed with a steam inlet pipe 12, the other end of the steam inlet pipe 12 is connected to the steam discharge end of the steam removal machine 8, and the fluid discharge end of the first heating plate 24 is fixed with a steam discharge pipe 10, which can discharge the condensed water and residual steam in the first heating plate 24; the fluid inlet end of the second heating plate 23 is fixed with a high-temperature fluid inlet pipe 13, and the fluid discharge end of the second heating plate 23 is fixed with a high-temperature fluid discharge pipe 9.

[0034] A scraper 25 is evenly and fixedly connected to the top of the recovery chamber. The top of the scraper 25 contacts the bottom of the lower straight section of the conveyor belt 22. The scraper 25 can be used to scrape off the DMF liquid adhering to the conveyor belt. A DMF liquid discharge pipe 14 is provided on one side of the recovery chamber. The bottom of the recovery chamber is inclined. The DMF liquid discharge pipe 14 is located at the lower end of the bottom of the recovery chamber. The recovered DMF liquid is discharged through the DMF liquid discharge pipe 14.

[0035] In some embodiments of the present application, the outer surface of the conveyor belt 22 is wrapped with a thermal pad to increase the heat conduction rate.

[0036] By setting up the distillation structure, water is heated in turn by using water vapor and high-temperature fluid, so that water can evaporate, thereby achieving separation of water and DMF solution, and the generated water vapor can be used as a heat source to heat the aqueous solution on the conveyor belt 22, thereby reducing the energy loss of the device.

[0037] The electrical components involved in this application are all existing technologies. Those skilled in the art are familiar with their connection methods. Through these people, all the electrical components in this application are connected to their corresponding power supplies through wires, and according to actual conditions, appropriate controllers are selected to meet control requirements. The specific connections and control sequences are described below. The electrical connections between the electrical components are completed in a sequential working order. The detailed connection methods are well known in the art. The following mainly introduces the working principles and processes, and no further explanation of electrical control is given.

[0038] To sum up: when the rotary centrifugal DMF gas recovery device is in use, the waste gas containing DMF gas is introduced into the inner cavity of the cyclone cylinder 1 through the air inlet pipe 3. At the same time, water is injected into the inner cavity of the cyclone cylinder 1 through the water spray pipe 4. The waste gas and water can simultaneously perform spiral motion in the cyclone cylinder 1, and the waste gas and water are fully in contact with each other. The DMF gas in the waste gas can be fully dissolved in the water, and under the action of centrifugal force, the other components in the waste gas are separated from the water and discharged through the exhaust pipe 5. When the other components in the waste gas contact the water film on the outer wall of the exhaust pipe 5, the water film cools the water vapor in the gas to realize the recovery of water vapor. The residual DMF gas can be dissolved in the water film, thereby improving the recovery rate of the DMF gas. The dehumidification structure can be used to further recover the water vapor.

[0039] The generated aqueous solution is discharged into the temporary storage area through the star-shaped discharge valve 7. The servo motor 11 works and drives the conveyor belt 22 to rotate. The conveyor belt 22 can quantitatively transport the aqueous solution. During the transportation of the aqueous solution, the fluid in the first heating plate 24 and the fluid in the second heating plate 23 can heat the aqueous solution in turn. The water in the aqueous solution can evaporate, and the water vapor in the evaporation zone is discharged through the steam removal machine. The DMF liquid remains on the conveyor belt 22 and gathers in the recovery chamber under the action of gravity. The recovered DMF liquid is discharged through the DMF liquid discharge pipe.

[0040] The standard parts used in the present invention can all be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the existing technology. The machinery, parts and equipment all adopt conventional models in the existing technology and will not be described in detail here. The content not described in detail in this specification belongs to the existing technology known to professional and technical personnel in this field. Although the embodiments of the present invention have been shown and described, it can be understood by ordinary technicians in this field that various changes, modifications, substitutions and modifications can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A rotary centrifugal DMF gas recovery device, comprising a separation structure and a distillation structure, characterized in that: The separation structure comprises a cyclone barrel (1), an air inlet end of the cyclone barrel (1) is fixedly connected to an air inlet pipe (3), a water spray pipe (4) is fixed in the middle of the inner cavity of the air inlet pipe (3), one end of the water spray pipe (4) extends to the outside of the air inlet pipe (3), an exhaust pipe (5) is fixedly connected in the middle of the top of the cyclone barrel (1), a dehumidification structure is provided at the top of the inner cavity of the exhaust pipe (5), and the bottom end of the exhaust pipe (5) extends to the cyclone barrel. The bottom end of the inner cavity of the cyclone body (1) is fixedly connected to the top of the inner cavity of the cyclone body (1), the inner wall of the water spray ring (15) is evenly provided with water spray holes, and the exhaust pipe (5) is located in the middle of the inner cavity of the water spray ring (15); the distillation structure includes a box body (2), the inner cavity of the box body (2) is movably connected to a conveyor belt (22), and the conveyor belt (22) divides the inner cavity of the box body (2) into an evaporation chamber, a heating chamber and a recovery chamber; A partition plate (21) is fixedly connected to one side of the inner cavity of the evaporation chamber, and the partition plate (21) divides the inner cavity of the evaporation chamber into a temporary storage area and a steam area. A blanking port (20) is provided in the middle of the top of the temporary storage area, and the discharge port of the cyclone barrel (1) is fixed to the top of the blanking port (20); a steam removal machine (8) is provided on the top of the steam area, and the steam inlet end of the steam removal machine (8) is located above the steam area; a first heating plate (24) and a second heating plate (23) are fixedly connected in the heating chamber, and the first heating plate (24) and the ... The hot plate (24) and the second heating plate (23) are both in contact with the bottom of the upper straight section of the conveyor belt (22); the first heating plate (24) and the second heating plate (23) are both located below the steam zone, and the steam discharge end of the steam removal machine (8) is connected to the fluid inlet end of the first heating plate (24); a scraper plate (25) is evenly and fixedly connected to the top of the recovery chamber, and the top of the scraper plate (25) is in contact with the bottom of the lower straight section of the conveyor belt (22); and a DMF liquid discharge pipe (14) is provided on one side of the recovery chamber.

2. A rotary centrifugal DMF gas recovery device according to claim 1, characterized in that: A water inlet pipe (6) is fixed to one side of the water spray ring (15), and the other end of the water inlet pipe (6) extends to the outside of the cyclone barrel (1).

3. A rotary centrifugal DMF gas recovery device according to claim 1, characterized in that: The dehumidification structure comprises a limiting mesh plate (19) fixedly connected to the inner cavity of the exhaust pipe (5), a water absorption strip (18) placed on the top of the limiting mesh plate (19), a pressing mesh plate (17) in contact with the top of the water absorption strip (18), and an electric telescopic rod (16) fixedly connected to the top of the pressing mesh plate (17), wherein the electric telescopic rod (16) is fixedly connected to the inner wall of the exhaust pipe (5), and the pressing mesh plate (17) is movably connected to the inner cavity of the exhaust pipe (5).

4. A rotary centrifugal DMF gas recovery device according to claim 1, characterized in that: A star-shaped discharge valve (7) is provided at the discharge end of the cyclone barrel (1).

5. A rotary centrifugal DMF gas recovery device according to claim 1, characterized in that: Both ends of the inner cavity of the box body (2) are movably connected to synchronous rollers, one side of the box body (2) is fixedly connected to a servo motor (11), and the end of the output shaft of the servo motor (11) is fixedly connected to the middle of the end of a synchronous roller; the two synchronous rollers are connected by a conveyor belt (22), and one end of the conveyor belt (22) close to the blanking port (20) is in contact with the inner wall of the box body (2), and a blanking gap is provided between the other end of the conveyor belt (22) and the box body (2).

6. A rotary centrifugal DMF gas recovery device according to claim 1, characterized in that: The bottom of the recovery chamber is inclined, and the DMF liquid discharge pipe (14) is located at the lower end of the bottom of the recovery chamber.

7. A rotary centrifugal DMF gas recovery device according to claim 1, characterized in that: There is a separation gap between the bottom of the partition plate (21) and the top of the conveyor belt (22); the temperature of the fluid entering the inner cavity of the first heating plate (24) is lower than the temperature of the fluid entering the inner cavity of the second heating plate (23), and under standard atmospheric pressure, the temperature of the fluid in the inner cavity of the second heating plate (23) is higher than 100°C but lower than 150°C.

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