Furfural gas-slag separation device and separation method thereof

Abstract

The invention discloses a furfural gas-slag separation device and a separation method thereof, comprising a condensing box, an air separator and a spray separator, the cyclone separator is connected to the spray separator through a first air pipe, the spray separator is connected to the condensing box through a second air pipe, the cyclone separator comprises a cyclone separation cylinder, a first air return pipe is arranged in the center of the upper end of the cyclone separation cylinder, and the top of the cyclone separation cylinder is connected to the furfural inlet pipe; the spray separator comprises a spray separation cylinder, an inner rotating cylinder is arranged in the spray separation cylinder, a plurality of hanging lines are arranged at the upper end and the lower end of the spray separation cylinder, a plurality of hanging beads are arranged on the hanging lines, a second air return pipe is arranged in the center of the inner rotating cylinder, and a spray pipe is arranged on one side of the second air return pipe; by performing multi-stage separation of various forms of centrifugal gravity, centrifugal spraying and shaking filtration on the furfural gas and slag, the separation effect of the furfural gas and slag is improved, and the purity of the furfural gas is improved; in addition, in the process of spray separation, the furfural gas and slag can be pre-cooled at the same time to improve the condensation efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of gas-slag separation, and in particular relates to a furfural gas-slag separation device and a separation method thereof. Background Art

[0002] Furfural, also known as furfural, is a light yellow or amber, crystal-clear liquid that is widely used in synthetic resins, petroleum refining, medicine, and other fields.

[0003] The existing furfural production process involves using a furfural gas-slag separation device to separate the gas and slag in the furfural production process to obtain furfural slag and pure furfural gas or liquid for furfural recovery and utilization.

[0004] Regarding the furfural gas-slag separation device, in the prior art, after searching, the Chinese patent publication number CN221788551U discloses a gas-slag separation and collection device for producing furfural, which mainly includes a separation box and a condensation box. The separation box and the condensation box are connected by an air pipe. A filter is provided in the separation box for separating the furfural gas and the furfural slag. The condensation box is used to condense the separated furfural gas for recycling.

[0005] The furfural gas-slag separation device similar to the above-mentioned technical solution in the prior art was found to have certain defects during actual implementation: the gas-slag was only separated in a single stage through a separation box, and the separation was performed through a filter inside the separation box. It was difficult to remove the solid slag with smaller particle size in the furfural gas-slag, resulting in incomplete separation and affecting the recovery purity of the furfural gas. Summary of the Invention

[0006] In view of the deficiencies and defects in the prior art, the object of the present invention is to provide a furfural gas-slag separation device and a separation method thereof, which solves the problem that the furfural gas-slag separation device in the prior art only performs single-stage separation of the gas-slag through a separation box, and the separation is performed through a filter in the separation box, which makes it difficult to remove solid slag with smaller particle size in the furfural gas-slag, resulting in incomplete separation and affecting the recovery purity of the furfural gas.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions: a furfural gas-slag separation device, comprising a condensation box, a cyclone separator and a spray separator, the cyclone separator is connected to the spray separator through a first air pipe, the spray separator is connected to the condensation box through a second air pipe, the cyclone separator comprises a cyclone separation cylinder, a recovery cylinder is provided at the bottom end of the cyclone separation cylinder, a first return air pipe is provided in the center of the upper end of the cyclone separation cylinder, the upper end of the first return air pipe extends out of the furfural inlet pipe and is connected to the first air pipe, the top of the cyclone separation cylinder is connected to the furfural inlet pipe, the upper end of the cyclone separation cylinder is connected to the furfural inlet pipe, A gas spiral flow guide is provided between the first return air pipe and the outer wall thereof, a rectifying guide vane is provided at the inner lower end of the first return air pipe, and a bowl-shaped silicone flow guide cleaning member is provided at the lower end of the rectifying guide vane in the cyclone separation drum. The silicone flow guide cleaning member is connected to a driving member that drives the member to move up and down, horizontally, and rotate. The silicone flow guide cleaning member is used to guide the furfural gas toward the first return air pipe, while shielding the member to reduce the furfural residue below from flowing back into the first return air pipe along with the furfural gas. The silicone flow guide cleaning member can extend between the cyclone separation drum and the first return air pipe to clean the furfural residue on the inner wall of the cyclone separation drum.

[0008] The spray separator includes a spray separation cylinder, a filter is provided near the lower end of the spray separation cylinder, an inner rotating cylinder is provided near the upper end of the spray separation cylinder for rotation, a plurality of hanging lines are provided at the upper end and the lower end of the spray separation cylinder, a plurality of hanging beads are provided on each hanging line, a plurality of protruding feet that can contact the hanging lines above the spray separation cylinder are fixed at the upper end of the inner rotating cylinder, a connecting pipe connected to the first air pipe is provided at the top of the inner rotating cylinder, an air outlet is provided near the upper end of the outer side of the inner rotating cylinder, a discharge port is provided at the bottom end of the inner rotating cylinder, a second return air pipe is provided in the center of the inner rotating cylinder, the upper end of the second return air pipe extends out of the inner rotating cylinder, a plurality of rotating blades are provided on the second return air pipe, a spray pipe is provided on one side of the second return air pipe, a nozzle is provided on the spray pipe in the inner rotating cylinder, the lower end of the spray pipe extends out of the inner rotating cylinder and extends to below the filter.

[0009] As a further improvement of the present invention, the gas spiral guide includes a sleeve ring, which is fixed on the first return pipe. A plurality of arc-shaped guide plates twisted and tilted toward one side in a counterclockwise direction are fixed on the outside of the sleeve ring, and the outside of the guide plates are fixed on the cyclone separation cylinder.

[0010] As a further improvement of the present invention, the lower end of the straightening guide vane extends out of the first return pipe, and the straightening guide vane includes multiple wing plates, the wing plates are arc-shaped, the middle parts of the multiple wing plates are fixedly connected together, and the lower ends of the wing plates are twisted toward the instantaneous clockwise direction.

[0011] As a further improvement of the present invention, the cyclone separation cylinder includes a cylindrical cylinder at the upper end and a conical cylinder at the lower end. The lower end of the conical cylinder is connected to the recovery cylinder. The diameter of the recovery cylinder is larger than the diameter of the bottom port of the conical cylinder. The upper end of the cylindrical cylinder is connected to the furfural inlet pipe through a docking flange.

[0012] As a further improvement of the present invention, the driving member includes a sliding rod, a telescopic rod, a slider, a fixed rod and a first motor. The sliding rod is rotatably set on the cyclone separation cylinder, the fixed rod is fixed in the cyclone separation cylinder and is located below the sliding rod, the first motor is provided in the middle of the fixed rod, and the output shaft of the first motor is connected to the sliding rod. The lower end of the silicone guide cleaning member is provided with a telescopic rod, and the bottom end of the telescopic rod is provided with a slider. The slider is slidably set on the sliding rod, and one side of the slider is connected to the electric push rod that drives it to slide.

[0013] As a further improvement of the present invention, the inner rotating cylinder includes an upper rotating cover and a lower rotating cylinder. The upper rotating cover is an arc-shaped structure, and the lower rotating cylinder is a conical cylinder. The lower end of the upper rotating cover bends inward and extends into the lower rotating cylinder. An air outlet is left between the upper rotating cover and the lower rotating cylinder, and the upper rotating cover and the lower rotating cylinder are connected by connecting ribs. The outer side of the lower rotating cylinder is rotatably connected to the spray separation cylinder.

[0014] As a further improvement of the present invention, the connecting pipe extends into the inner rotating cylinder and is fixedly connected to the inner rotating cylinder. The upper end of the connecting pipe extends out of the spray separation cylinder and is rotationally connected to the spray separation cylinder. The upper end of the connecting pipe is rotationally connected to the first air pipe.

[0015] As a further improvement of the present invention, a first gear is fixed on the connecting pipe, and a second gear is rotatably provided on the upper end of the spray separation cylinder. The first gear and the second gear are meshed and connected, and the second gear is connected to a second motor that drives it to rotate.

[0016] As a further improvement of the present invention, a stirring blade is provided at the lower end of the spray pipe above the filter screen.

[0017] A method for separating gas and slag using a furfural gas and slag separation device comprises the following steps:

[0018] (1) Primary separation: Furfural gas residue is guided into the cyclone separation cylinder from the upper end of the cyclone separation cylinder through the gas spiral guide. The furfural gas residue entering the cyclone separation cylinder spirally runs downward. The furfural residue in the furfural gas residue is thrown onto the inner wall of the cyclone separation cylinder under the action of centrifugal force and flows downward into the recovery cylinder under the action of gravity. The furfural gas with some furfural residue removed flows from the first reflux pipe to the first gas pipe through the rectification of the tidying guide vane, completing the primary separation of furfural gas residue.

[0019] (2) Secondary separation and cooling: The inner rotating cylinder and the spray pipe are rotated to open, and the furfural gas residue in the first air pipe enters the inner rotating cylinder through the connecting pipe. The second reflux pipe rotates with the inner rotating cylinder and stirs the furfural gas residue entering the inner rotating cylinder. During the stirring process, the furfural gas residue in the furfural gas residue falls downward from the discharge port to the bottom of the spray separation cylinder under the multiple effects of centrifugal force, spray flushing and gravity. Part of the furfural gas in the furfural gas residue enters the upper end of the inner rotating cylinder from the second reflux pipe, part of it flows out from the gas outlet to the outside of the inner rotating cylinder, and the other part flows downward from the discharge port and deflects upward, completing the secondary separation and cooling of the furfural gas residue;

[0020] (3) Three-stage separation: During the rotation of the inner rotating drum, the hanging wire and the hanging beads are moved or swung. The furfural residue remaining in the furfural gas entering the hanging wire and the spray liquid carried out flow downward under the blocking filtration, turbulent flow shaking and gravity of the hanging wire, completing the three-stage separation of furfural gas and residue. The separated furfural gas enters the second air pipe;

[0021] (4) Condensation of furfural gas: Furfural gas enters the condensation box for condensation recovery;

[0022] (5) Cleaning the inner wall of the cyclone separation tube: After the furfural gas-slag separation work is completed, move the center of the silicone guide cleaning piece to one side to the position below the inner wall of the cyclone separation tube and the outer wall of the first return pipe, move the silicone guide cleaning piece upward so that the silicone guide cleaning piece moves upward to between the inner wall of the cyclone separation tube and the outer wall of the first return pipe, move the silicone guide cleaning piece up and down, and rotate the silicone guide cleaning piece to clean the inner wall of the cyclone separation tube, the outer wall of the first return pipe, and the outer side of the rectifying guide vane.

[0023] Compared with the prior art, the present invention has the following advantages:

[0024] 1. By providing a cyclone separator, a spray separator, and a condensing box, and configuring the cyclone separator to comprise a cyclone separation cylinder, a first reflux pipe, a gas spiral guide, a rectifying guide vane, and a silica gel guide cleaning member, the gas spiral guide can guide the furfural gas residue entering the cyclone separation cylinder in a spiral manner, so that the furfural gas residue flows spirally downward. When the furfural gas in the furfural gas residue flows to the lower end, it flows back upward through the first reflux pipe, while the furfural residue in the furfural gas residue flows downward along the wall of the cyclone separation cylinder into the recovery cylinder under the action of centrifugal gravity. The centrifugal gravity of the cyclone separator can remove most of the furfural residue in the furfural gas residue, thereby completing the primary separation of the furfural gas residue.

[0025] The spray separator is configured as a structure of a spray separation cylinder, a spray pipe, an inner rotating cylinder, a hanging line and hanging beads, and the spraying of the spray pipe in the inner rotating cylinder causes the furfural residue in the furfural gas residue to adhere to the liquid and become heavier, thereby settling downward. At the same time, the rotation of the inner rotating cylinder and the stirring of the rotating blades on the spray pipe cause the furfural gas residue to pass through the discharge port of the inner rotating cylinder and sink to the bottom of the spray separation cylinder under the multiple interactions of centrifugal force and the entrainment of the spray liquid, while the furfural gas can flow upward to the top of the spray separation cylinder through the second reflux pipe and the gas outlet, and even smaller particles of furfural residue can be well removed, with good separation effect, completing the secondary separation of furfural gas residue, and greatly improving the separation effect; in addition, while the furfural gas residue is sprayed and separated, the spray liquid can also wash the inner wall of the inner rotating cylinder, reducing the adhesion of furfural residue on the inner wall of the inner rotating cylinder, and the technical effect is good;

[0026] By arranging hanging wires and hanging beads above the spray separation cylinder and below the inner rotating cylinder, the hanging wires and hanging beads can form a filtering barrier to filter the furfural residue in the furfural gas residue and the spray liquid brought out; secondly, driven by the rotation of the inner rotating cylinder, the hanging wires and hanging beads continuously shake to form a vibrator and a spoiler, which can shake, vibrate and disturb the furfural residue in the furfural gas residue and the filtrate brought out, so that the residual furfural residue and the spray liquid in the furfural gas residue can be shaken off and sink, thereby completing the three-stage separation of furfural gas residue.

[0027] In short, by subjecting furfural gas residue to multi-stage separation in various forms such as centrifugal gravity, centrifugal spraying, and shaking filtration, the separation effect of furfural gas residue is improved layer by layer, and the purity of furfural gas is improved; in addition, in the process of spray separation, the furfural gas residue can be pre-cooled at the same time, and the temperature of the furfural gas entering the condensation box can be lowered, thereby reducing the condensation temperature difference and improving the condensation efficiency. No additional components are required, and the separation and pre-cooling of furfural gas residue can be completed simultaneously. The structure is compact and simple, and the effect is good.

[0028] In addition, the secondary and tertiary separations of furfural gas and slag can cooperate and coordinate with each other. The secondary separation is carried out inside the inner rotating cylinder, and the tertiary separation is carried out outside the inner rotating cylinder. The rotation of the inner rotating cylinder simultaneously drives the flow disturbance of furfural gas and slag inside and outside. The rotation of the inner rotating cylinder can drive the hanging wire and hanging beads to shake, so as to assist the hanging wire and hanging beads in the tertiary separation of furfural gas and slag. The secondary and tertiary separations work in coordination with each other, the structure is compact, and the power source is reduced. In addition, when the hanging wire and hanging beads on the inner rotating cylinder rotate, the bottom of the hanging wire and hanging beads swing outward and contact the inner wall of the spray separation cylinder, thereby scraping off the furfural slag adhering to the inner wall of the furfural separation cylinder. The setting of one component plays multiple roles and has a good technical effect.

[0029] Furthermore, by installing a filter at the lower end of the spray separation cylinder and extending the spray pipe into the lower end of the filter, the filter can filter the spray liquid flowing to the lower side of the spray separation cylinder, reducing or preventing furfural residue from entering the lower end of the filter. The spray liquid at the lower end of the filter can then return to the spray pipe, forming an internal spray liquid circulation. Since the spray liquid is provided at the lower side of the spray separation cylinder, after the furfural residue falls into the spray liquid, it is wrapped by the gravity of the spray liquid and prevented from flowing back upward with the furfural gas, thus improving the separation effect.

[0030] In addition, by providing the rectifying guide vanes, the spiral gas at the bottom can be concentrated and directed to flow upward, thereby facilitating the recovery of the gas and reducing the vibration of the first reflux pipe.

[0031] A bowl-shaped silicone guide cleaning piece is provided under the rectifying guide vane, and the silicone guide cleaning piece is connected to a driving piece that drives it to move up and down, horizontally and rotate. The setting of the silicone guide cleaning piece can, firstly, block the furfural gas flowing downward to a certain extent, reduce the furfural gas from continuing to flow downward to the furfural slag below, and facilitate the upward reflux of the furfural gas; secondly, for a small amount of furfural gas flowing under the silicone guide cleaning piece, in the process of upward recovery, it can block the furfural slag in the furfural gas slag from moving upward, so that the furfural slag encounters resistance and falls under the action of gravity, reducing the upward return of the furfural slag; thirdly, after the furfural gas and slag separation work is completed, the silicone guide cleaning piece can be moved to one side and run upward between the first reflux pipe and the cyclone separation cylinder, and then the silicone guide cleaning piece can be continuously moved up and down and rotated to complete the cleaning of the inner wall of the cyclone separation cylinder and the outer wall of the first reflux pipe, thereby reducing the adhesion of furfural slag. Furthermore, when the silicone flow guide cleaning member moves upward to between the first return pipe and the cyclone separation drum, it flips downward into an umbrella shape, blocked by the first return pipe, to facilitate the shaking off of furfural residue from the silicone flow guide cleaning member. This configuration of a single component performs different functions in different states, resulting in a compact structure and strong functionality.

[0032] 2. By configuring the gas spiral guide member to have a sleeve ring and a guide plate structure, the gas entering the cyclone separation cylinder can be spirally introduced to generate centrifugal force in the cyclone separation cylinder, thereby facilitating the separation of furfural gas and slag.

[0033] 3. By setting the rectifying guide vane as a wing plate, the wing plate is arc-shaped, and the lower end of the wing plate is twisted toward the instantaneous clockwise direction, the spiral furfural gas can be introduced upward, facilitating the upward backflow of the furfural gas.

[0034] 4. By setting the driving part in a structure of a sliding rod, a telescopic rod, a slider, a fixed rod and a first motor, the extension and retraction of the electric push rod drives the slider to slide, so that the silicone guide cleaning part can be moved to the center of the cyclone separation cylinder or to between the outer wall of the first return pipe and the inner wall of the cyclone separation cylinder. The extension and retraction of the telescopic rod can drive the silicone guide cleaning part to move up and down, and the first motor can drive the sliding rod to rotate, thereby driving the silicone guide cleaning part to rotate, thereby completing the cleaning of the inner wall of the cyclone separation cylinder.

[0035] 5. The inner rotary cylinder is provided with an upper rotary cover and a lower rotary cylinder, wherein the upper rotary cover is an arc-shaped structure, the lower rotary cylinder is a conical cylinder, and an air outlet is left between the upper rotary cover and the lower rotary cylinder. The conical structure of the lower rotary cylinder facilitates the downward sedimentation flow of the furfural residue during the secondary separation, and facilitates the reflux and overflow of the furfural gas. At the same time, during the tertiary separation, it is convenient to intercept the upward-flowing furfural gas, so as to block and remove the furfural residue and the spray liquid in the furfural gas, facilitate the separation of the furfural gas and the residue, and achieve the synergistic effect of the secondary and tertiary stages of the furfural gas and the residue.

[0036] 6. By setting a first gear on the connecting pipe, a second gear is provided on the upper end of the spray separation cylinder for rotation. The second gear is connected to the second motor, and the second motor can drive the second gear to rotate. The rotation of the second gear drives the first gear to rotate, thereby driving the inner rotating cylinder to rotate.

[0037] 7. By arranging a stirring blade at the lower end of the spray pipe, the spray pipe can be used not only to spray the furfural gas residue, but also to stir the spray liquid at the bottom to facilitate the rapid overflow of the furfural gas entering the spray liquid. One component can perform multiple functions at the same time and has strong functionality.

[0038] 8. A method for separating furfural gas and slag by using a furfural gas and slag separation device can achieve a cyclone centrifugal primary separation, a spray centrifugal secondary separation, and a filtration and shaking tertiary separation of furfural gas and slag, thereby improving the separation effect of furfural gas and slag; in addition, during the secondary separation process, the furfural gas can be pre-cooled at the same time, thereby reducing the condensation temperature difference, improving the condensation efficiency, and reducing the number of operating steps. No additional components are required, and the separation and pre-cooling of furfural gas and slag can be completed simultaneously. The structure is compact and simple, and the effect is good. In addition, during the three-stage separation process, the spray liquid brought out during the secondary separation process and the residual furfural slag in the furfural gas can be removed at the same time, simplifying the operating steps and improving the separation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The present invention will be further described below in conjunction with the accompanying drawings:

[0040] Figure 1 It is a structural schematic diagram of the present invention;

[0041] Figure 2Schematic diagram of the cross-sectional structure of a cyclone separator;

[0042] Figure 3 Schematic diagram of the cross-sectional structure of the spray separator;

[0043] Figure 4 for Figure 2 Enlarged view at point A;

[0044] Figure 5 for Figure 3 Enlarged view at point B;

[0045] In the figure: 1. Condensation box; 2. Cyclone separator; 201. Column; 202. Conical cylinder; 3. Spray separator; 301. Spray separation cylinder; 302. Filter; 303. Inner rotating cylinder; 3031. Upper rotating cover; 3032. Lower rotating cylinder; 3033. Connecting rib; 304. Hanging wire; 305. Hanging bead; 306. Protruding foot; 307. Connecting pipe; 308. Air outlet; 309. Feeding port; 310. Second air return pipe; 311. Rotating blade; 312. Spray pipe; 4. Driving member; 401. Sliding rod; 402. Telescopic rod; 403. Sliding block; 404. Fixed rod; 40 5. First motor; 406. Electric push rod; 5. Second air pipe; 6. Recovery cylinder; 7. First return air pipe; 8. Gas spiral guide; 801. Sleeve ring; 802. Guide plate; 9. Rectifying guide vane; 901. Wing plate; 10. Silicone guide cleaning piece; 101. Guide hole; 102. Feed hole; 11. First air pipe; 12. First gear; 13. Second gear; 14. Second motor; 15. Stirring blade; 16. Furfural inlet pipe; 161. Vertical pipe section; 162. Horizontal pipe section; 163. Bottom connecting plate; 164. Sealing cover; 17. Docking flange; 18. Rotary joint. DETAILED DESCRIPTION

[0046] The following is combined with Figure 1-5 The present invention will be described in further detail. For a clearer illustration, only the structures related to the invention of the present invention are shown in the figures.

[0047] For the convenience of description, the coordinate system is defined as follows Figure 1 As shown, the left-right direction is the horizontal direction, the front-back direction is the longitudinal direction, and the up-down direction is the vertical direction.

[0048] The embodiment of the present invention discloses a furfural gas-slag separation device. Figure 1 A furfural gas-slag separation device includes a condensation box 1. The condensation box 1 can be a commonly used gas condensation box 1 in the prior art, which is used to condense furfural gas into liquid for easy recovery.

[0049] In addition, the present invention also includes a cyclone separator 2 and a spray separator 3, such as Figure 1 and Figure 2 As shown, the cyclone separator 2 is connected to the spray separator 3 through the first air pipe 11, and the spray separator 3 is connected to the condensation tank 1 through the second air pipe 5. The cyclone separator 2 includes a cyclone separation cylinder, and the bottom end of the cyclone separation cylinder is fixedly connected to the recovery cylinder 6 for recovering furfural residue. The cyclone separation cylinder includes a cylindrical cylinder 201 at the upper end and a conical cylinder 202 at the lower end. The cylindrical cylinder 201 and the conical cylinder 202 are made as one piece. The lower end of the conical cylinder 202 can be connected to the recovery cylinder 6 by bolts or locks. The diameter of the recovery cylinder 6 is larger than the diameter of the bottom port of the conical cylinder 202. The upper end of the cylindrical cylinder 201 is detachably connected to the furfural inlet pipe 16 through a docking flange 17.

[0050] like Figure 1 As shown, a first air return pipe 7 is fixedly connected to the center of the upper end of the cyclone separation cylinder, and a furfural air inlet pipe 16 is extended from the upper end of the first air return pipe 7 and is detachably connected to the first air pipe 11. The furfural air inlet pipe 16 includes a vertical pipe section 161, and the bottom end of the vertical pipe section 161 is welded and fixed to one of the docking flanges 17. A horizontal pipe section 162 is welded and fixed to the left side of the vertical pipe section 161, and a bottom connecting plate 163 is fixed to the top of the vertical pipe section 161. The upper end of the first air return pipe 7 passes through the vertical pipe section 161, and the upper end of the bottom connecting plate 163 is detachably connected to two semicircular sealing covers 164 by bolts.

[0051] like Figure 2 As shown, a gas spiral guide 8 is provided between the upper inner end of the cyclone and the outer wall of the first return pipe 7. This guide 8 is used to spirally guide the gas entering the cyclone. Specifically, the guide 8 comprises a sleeve ring 801 welded to the first return pipe. A plurality of arc-shaped guide plates 802, twisted and tilted counterclockwise, are fixed to the outer side of the sleeve ring 801. The outer sides of the guide plates 802 are welded to the inner wall of the cyclone. By configuring the gas spiral guide 8 as a sleeve ring 801 and guide plates 802 structure, the gas entering the cyclone can be spirally guided, thereby generating centrifugal force within the cyclone and facilitating the separation of furfural gas and slag.

[0052] like Figure 2 As shown, a straightening guide vane 9 is provided at the lower end of the first return air pipe 7. The lower end of the straightening guide vane 9 extends out of the first return air pipe. The straightening guide vane 9 includes a plurality of curved vane plates 901. The plurality of vane plates 901 are fixedly connected at their middle portions, and the lower ends of the vane plates 901 are twisted toward one side in the instantaneous clockwise direction. The twisting direction of the vane plates 901 of the straightening guide vane 9 is opposite to the direction of flow of the spiral gas guide 8. By configuring the straightening guide vane 9 as the vane plates 901, the curved vane plates 901, and the twisting of the lower ends of the vane plates 901 toward one side in the instantaneous clockwise direction, the spiral furfural gas can be intercepted and directed upward, facilitating the centralized upward reflow of the furfural gas.

[0053] like Figure 2 and Figure 4 As shown, a bowl-shaped silicone flow guide cleaning member 10 is provided at the lower end of the rectifying guide vane 9 in the cyclone separation drum. The silicone flow guide cleaning member 10 can be flipped downward and deformed. The silicone flow guide cleaning member 10 is provided with a plurality of guide holes 101. A material passage hole 102 is provided at the bottom of the silicone flow guide cleaning member 10. The arrangement of the guide holes 101 and the material passage hole 102 facilitates the downward drop of a small amount of residual furfural residue and facilitates the downward flipping and deformation of the silicone flow guide member. After the silicone flow guide member is flipped downward and deformed, it forms an umbrella shape. The silicone flow guide cleaning member 10 is connected to a drive member 4 that drives it to move up and down, horizontally, and rotate. The silicone flow guide cleaning member 10 is used to guide the furfural gas to the first return air pipe 7, while blocking to reduce the furfural residue below from flowing back into the first return air pipe 7 with the furfural gas. In addition, the silicone flow guide cleaning member 10 can also extend between the cyclone separation drum and the first return air pipe 7 to clean the furfural residue on the inner wall of the cyclone separation drum. As for the driving member 4, specifically, the driving member 4 includes a slide rod 401, a telescopic rod 402, a slider 403, a fixed rod 404 and a first motor 405. The slide rod 401 is rotatably set on the cyclone separation cylinder, the fixed rod 404 is fixed in the cyclone separation cylinder, and is located below the slide rod 401. The first motor 405 is fixed in the middle of the fixed rod 404, and the output shaft of the first motor 405 is connected to the slide rod 401. The lower end of the silicone guide cleaning member 10 is provided with a telescopic rod 402. The telescopic rod 402 can adopt an automatically retractable telescopic member such as a hydraulic push rod, an electric push rod 406, etc. The bottom end of the telescopic rod 402 is fixed with a slider 403, the slider 403 is slidably set on the slide rod 401, and one side of the slider 403 is connected to the electric push rod 406 that drives it to slide. The extension and retraction of the electric push rod 406 drives the slider 403 to slide, so that the silicone guide cleaning piece 10 can be moved to the center of the cyclone separation cylinder or to the corresponding position below the outer wall of the first return pipe and the inner wall of the cyclone separation cylinder. The extension and retraction of the telescopic rod 402 can drive the silicone guide cleaning piece 10 to move up and down, and the first motor 405 can drive the slide rod 401 to rotate, thereby driving the silicone guide cleaning piece 10 to rotate, thereby completing the cleaning of the inner wall of the cyclone separation cylinder.

[0054] like Figure 1 、 Figure 3 and Figure 5As shown, the spray separator 3 includes a spray separation barrel 301, the lower side of which is provided with a spray liquid, which is a liquid incompatible with furfural gas. In addition, a heat sink can be welded to the outside of the bottom end of the spray separation barrel 301 or several sets of cooling fans can be set to cool the spray liquid. The heat sink and cooling fans are not shown in the accompanying drawings. The structure and arrangement of the heat sink can adopt the common arrangement of heat sinks in the prior art. The upper right end of the spray separation barrel 301 is provided with an outlet, which is connected to the second air pipe 5. The second air pipe 5 can be provided with an air pump to provide power for conveying furfural gas, and a screen can be provided on the outlet. A filter 302 is provided near the lower end of the spray separation barrel 301. In addition, the spray separation barrel 301 can be made in a split manner. Specifically, the spray separation barrel 301 includes a bottom barrel and an upper barrel, which are connected by threads or locks, and the filter 302 is arranged in the bottom barrel.

[0055] like Figure 3 and Figure 5 As shown, an inner rotating cylinder 303 is provided for rotation near the upper end of the spray separation cylinder 301, and a plurality of hanging lines 304 are provided at the upper end of the spray separation cylinder 301 and the lower end of the inner rotating cylinder 303, and a plurality of hanging beads 305 are provided on each hanging line 304, and a plurality of protruding feet 306 that can contact the hanging lines 304 above the spray separation cylinder 301 are fixed at the upper end of the inner rotating cylinder 303, and a connecting pipe 307 connected to the first air pipe 11 is provided at the top of the inner rotating cylinder 303, and the connecting pipe 307 extends into the inner rotating cylinder 303 and is fixedly connected to the inner rotating cylinder 303, and the upper end of the connecting pipe 307 extends out of the spray separation cylinder 301 and is rotatably connected to the spray separation cylinder 301, and the upper end of the connecting pipe 307 is rotatably connected to the first air pipe 11 through a rotary joint 18. The connecting tube 307 is fixedly connected to a first gear 12, and the upper end of the spray separation cylinder 301 is rotatably provided with a second gear 13. The first gear 12 and the second gear 13 are meshed and connected, and the second gear 13 is connected to a second motor 14 that drives its rotation. By providing the first gear 12 on the connecting tube 307 and the second gear 13 rotatably provided on the upper end of the spray separation cylinder 301, and connecting the second gear 13 to the second motor 14, the second motor 14 can drive the second gear 13 to rotate. The rotation of the second gear 13 thereby drives the first gear 12 to rotate, and thus drives the inner rotating cylinder 303 to rotate.

[0056] like Figure 2 and Figure 5As shown, an air outlet 308 is provided on the outer side of the inner rotating cylinder 303 near the upper end, and a discharge port 309 is provided at the bottom end of the inner rotating cylinder 303; the specific structure of the inner rotating cylinder 303 is as follows: the inner rotating cylinder 303 includes an upper rotating cover 3031 and a lower rotating cylinder 3032, the upper rotating cover 3031 is an arc-shaped structure, and the lower rotating cylinder 3032 is a conical cylinder 202, the lower end of the upper rotating cover 3031 is bent inward and extends into the lower rotating cylinder 3032, and the space between the upper rotating cover 3031 and the lower rotating cylinder 3032 is 202. An air outlet 308 is provided, and the upper rotary cover 3031 and the lower rotary cylinder 3032 are connected by a connecting rib 3033. The outer side of the lower rotary cylinder 3032 is rotatably connected to the spray separation cylinder 301. The rotatable connection between the lower rotary cylinder 3032 and the spray separation cylinder 301 can adopt a rotatable structure commonly used in the prior art. For example, a slip ring can be fixedly connected to the inner wall of the spray separation cylinder 301, and an annular slide bar that slidably cooperates with the slip ring can be fixedly connected to the lower rotary cylinder 3032. The conical structure of the lower rotary cylinder 3032 facilitates the downward sedimentation flow of furfural residue during secondary separation and facilitates the backflow and overflow of furfural gas. At the same time, during tertiary separation, it facilitates the interception of the upward-flowing furfural gas to block the removal of furfural residue and spray liquid in the furfural gas, facilitate the separation of furfural gas and residue, and achieve secondary and tertiary synergistic effects of furfural gas and residue.

[0057] like Figure 5 As shown, a second air return pipe 310 is provided in the center of the inner rotating cylinder 303, and the upper end of the second air return pipe 310 extends out of the inner rotating cylinder 303. The second air return pipe 310 is provided with a plurality of rotating blades 311. A spray pipe 312 is provided on one side of the second air return pipe 310. The spray pipe 312 is provided with a nozzle in the inner rotating cylinder 303. The lower end of the spray pipe 312 extends out of the inner rotating cylinder 303 and extends to the bottom of the filter 302. The lower end of the spray pipe 312 is provided with a stirring blade 15 above the filter 302. The spray pipe 312 can be connected to a water pump that can lift the spray liquid upward; the filter 302 can filter the spray liquid flowing to the lower side of the spray separation cylinder 301, reduce or avoid furfural residue from entering the lower end of the filter 302, and the spray liquid at the lower end of the filter 302 can return to the spray pipe 312 again, forming an internal spray liquid circulation. In addition, after the furfural residue falls into the spray liquid, it is wrapped by the gravity of the spray liquid to avoid flowing back upward with the furfural gas, thereby improving the separation effect.

[0058] By arranging a stirring blade 15 at the lower end of the spray pipe 312, the spray pipe 312 can not only be used to spray furfural gas residue, but also can stir the spray liquid at the bottom to facilitate the rapid overflow of furfural gas entering the spray liquid. One component can perform multiple functions at the same time and has strong functionality.

[0059] The present invention provides a cyclone separator 2, a spray separator 3 and a condensation tank 1, and configures the cyclone separator 2 to have a structure comprising a cyclone separation cylinder, a first reflux pipe, a gas spiral guide 8, a rectifying guide vane 9 and a silica gel guide cleaning member 10. The gas spiral guide 8 can guide the furfural gas residue entering the cyclone separation cylinder in a spiral manner, so that the furfural gas residue flows spirally downward. When the furfural gas in the furfural gas residue flows to the lower end, it flows back upward through the first reflux pipe, while the furfural residue in the furfural gas residue flows downward along the wall of the cyclone separation cylinder into the recovery cylinder 6 under the action of centrifugal gravity. The centrifugal gravity of the cyclone separator 2 can remove most of the larger particles of furfural residue in the furfural gas residue, thereby completing the primary separation of the furfural gas residue.

[0060] The spray separator 3 is configured as a structure of a spray separation cylinder 301, a spray pipe 312, an inner rotating cylinder 303, a hanging line 304 and a hanging ball 305. The spray of the spray pipe 312 in the inner rotating cylinder 303 causes the furfural residue in the furfural gas residue to adhere to the liquid and become heavier, thereby settling downward. At the same time, the rotation of the inner rotating cylinder 303 and the stirring of the rotating blades 311 on the spray pipe 312 cause the furfural gas residue to pass through the inner rotating cylinder 303 under the multiple interactions of centrifugal force and the entrainment of the spray liquid. The discharge port of cylinder 303 sinks to the bottom of the spray separation cylinder 301, while the furfural gas can flow upward through the second reflux pipe and the gas outlet 308 to the top of the spray separation cylinder 301. Even small particles of furfural residue can be effectively removed, achieving a good separation effect, completing the secondary separation of furfural gas and residue, and greatly improving the separation effect. In addition, while the furfural gas and residue are sprayed and separated, the spray liquid can also wash the inner wall of the inner rotating cylinder 303, reducing the adhesion of furfural residue on the inner wall of the inner rotating cylinder 303, resulting in a good technical effect.

[0061] By arranging a hanging line 304 and a hanging bead 305 above the spray separation cylinder 301 and below the inner rotating cylinder 303, the hanging line 304 and the hanging bead 305 form a filtering barrier, which can filter the furfural residue in the furfural gas residue and the spray liquid brought out; secondly, driven by the rotation of the inner rotating cylinder 303, they continuously shake to form a vibrator and a spoiler, which can shake, vibrate and disturb the furfural residue in the furfural gas residue and the filtrate brought out, so that the residual furfural residue and the spray liquid in the furfural gas residue can be shaken off and sink, thereby completing the three-stage separation of furfural gas residue.

[0062] In short, by subjecting the furfural gas residue to multi-stage separation in various forms such as centrifugal gravity, centrifugal spraying, and shaking filtration, the separation effect of the furfural gas residue is improved layer by layer, and the purity of the furfural gas is improved; in addition, during the spray separation process, the furfural gas residue can be pre-cooled at the same time, and the temperature of the furfural gas entering the condensation box 1 can be lowered, thereby reducing the condensation temperature difference and improving the condensation efficiency. No additional components are required, and the separation and pre-cooling of the furfural gas residue can be completed simultaneously. The structure is compact and simple, and the effect is good.

[0063] Furthermore, the secondary and tertiary separations of furfural gas and slag can cooperate and coordinate with each other, with secondary separation occurring within the inner rotating cylinder 303 and tertiary separation occurring outside the inner rotating cylinder 303. The rotation of the inner rotating cylinder 303 simultaneously causes disturbances in the flow of furfural gas and slag inside and outside the cylinder, and the rotation of the inner rotating cylinder 303 can also cause the suspension wire 304 and the suspension bead 305 to vibrate, thereby assisting the suspension wire 304 and the suspension bead 305 in performing the tertiary separation of furfural gas and slag. The secondary and tertiary separations coordinate with each other, resulting in a compact structure and reduced power source. Furthermore, when the suspension wire 304 and the suspension bead 305 on the inner rotating cylinder 303 rotate, the bottoms of the suspension wire 304 and the suspension bead 305 swing outward, contacting the inner wall of the spray separation cylinder 301, thereby scraping off any furfural slag adhering to the inner wall of the furfural separation cylinder. This single component serves multiple functions, resulting in a superior technical effect.

[0064] In addition, a bowl-shaped silicone guide cleaning piece 10 is provided below the rectifying guide vane 9, and the silicone guide cleaning piece 10 is connected to the driving piece 4 that drives it to move up and down, horizontally and rotate. The setting of the silicone guide cleaning piece 10 can, firstly, block the furfural gas flowing downward to a certain extent, reduce the furfural gas from continuing to flow downward to the furfural slag below, and facilitate the upward reflux of the furfural gas; secondly, for the small amount of furfural gas flowing below the silicone guide cleaning piece 10, in the process of upward recovery, it can block the furfural slag in the furfural gas slag from moving upward, so that the furfural slag encounters resistance and falls under the action of gravity, reducing the upward reflux of the furfural slag; thirdly, after the furfural gas and slag separation work is completed, the silicone guide cleaning piece 10 can be moved to one side and run upward between the first reflux pipe and the cyclone separation cylinder, and then the silicone guide cleaning piece 10 is continuously moved up and down and rotated, thereby completing the cleaning of the inner wall of the cyclone separation cylinder and the outer wall of the first reflux pipe, and reducing the adhesion of furfural slag. In addition, when the silicone flow guide cleaning member 10 moves upward to between the first return pipe and the cyclone separation drum, it will flip downward into an umbrella shape under the obstruction of the first return pipe, making it easier to shake off the furfural residue on the silicone flow guide cleaning member 10. The setting of a single component plays different roles in different states, with a compact structure and strong functionality.

[0065] A method for separating gas and slag using a furfural gas and slag separation device comprises the following steps:

[0066] (1) Primary separation: Furfural gas residue is guided from the upper end of the cyclone separation cylinder into the cyclone separation cylinder through the gas spiral guide 8. The furfural gas residue entering the cyclone separation cylinder spirally runs downward. The furfural residue in the furfural gas residue is thrown onto the inner wall of the cyclone separation cylinder under the action of centrifugal force and flows downward into the recovery cylinder 6 under the action of gravity. The furfural gas with some furfural residue removed flows from the first reflux pipe to the first gas pipe 11 through the rectification of the tidying guide vane, completing the primary separation of furfural gas residue.

[0067] (2) Secondary separation and cooling: the inner rotating cylinder 303 and the spray pipe 312 are rotated to open, and the furfural gas residue in the first air pipe 11 enters the inner rotating cylinder 303 through the connecting pipe 307. The second reflux pipe rotates with the inner rotating cylinder 303 and stirs the furfural gas residue entering the inner rotating cylinder 303. During the stirring process, the furfural gas residue in the furfural gas residue falls downward from the discharge port to the bottom of the spray separation cylinder 301 under the multiple effects of centrifugal force, spray flushing and gravity. A part of the furfural gas in the furfural gas residue enters the upper end of the inner rotating cylinder 303 from the second reflux pipe, a part flows out from the gas outlet 308 to the outside of the inner rotating cylinder 303, and the other part flows downward from the discharge port and deflects upward, completing the secondary separation and cooling of the furfural gas residue;

[0068] (3) Three-stage separation: During the rotation of the inner rotating cylinder 303, the hanging line 304 and the hanging bead 305 are moved or swung. The furfural residue remaining in the furfural gas entering the hanging line 304 and the spray liquid carried out flow downward under the blocking filtration of the hanging line 304, the turbulent flow shaking and the action of gravity, completing the three-stage separation of furfural gas and residue. The separated furfural gas enters the second air pipe 5;

[0069] (4) Condensation of furfural gas: Furfural gas enters the condensation box 1 for condensation recovery;

[0070] (5) Cleaning the inner wall of the cyclone separation tube: After the furfural gas-slag separation work is completed, move the center of the silicone guide cleaning piece 10 to one side to the position below the inner wall of the cyclone separation tube and the outer wall of the first return pipe, move the silicone guide cleaning piece 10 upward, so that the silicone guide cleaning piece 10 moves upward to between the inner wall of the cyclone separation tube and the outer wall of the first return pipe, move the silicone guide cleaning piece 10 up and down, and rotate the silicone guide cleaning piece 10 to clean the inner wall of the cyclone separation tube, the outer wall of the first return pipe, and the outer side of the rectifying guide vane 9.

[0071] By using a furfural gas-slag separation device to perform a gas-slag separation method, it is possible to achieve a cyclone centrifugal primary separation, a spray centrifugal secondary separation, and a filtration shaking tertiary separation of the furfural gas-slag, thereby improving the separation effect of the furfural gas-slag; in addition, during the secondary separation process, the furfural gas can be pre-cooled at the same time, thereby reducing the condensation temperature difference, improving the condensation efficiency, and reducing the number of operating steps. No additional components are required, and the separation and pre-cooling of the furfural gas-slag can be completed simultaneously. The structure is compact and simple, and the effect is good. In addition, during the three-stage separation process, the spray liquid brought out during the secondary separation process and the residual furfural slag in the furfural gas can be removed at the same time, simplifying the operating steps and improving the separation effect.

[0072] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. It should be understood that the specific embodiments described herein are only used to understand the present invention and are not used to limit the present invention. All other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of the present invention.

Claims

1. A furfural gas-slag separation device, comprising a condensation tank, characterized in that: The cyclone separator also includes a cyclone separator and a spray separator, wherein the cyclone separator is connected to the spray separator through a first air pipe, and the spray separator is connected to the condensation box through a second air pipe. The cyclone separator includes a cyclone separation cylinder, a recovery cylinder is provided at the bottom end of the cyclone separation cylinder, a first return air pipe is provided in the center of the upper end of the cyclone separation cylinder, a furfural air inlet pipe extends from the upper end of the first return air pipe and is connected to the first air pipe, and the top of the cyclone separation cylinder is connected to the furfural air inlet pipe, and a gas spiral guide is provided between the upper end of the cyclone separation cylinder and the outer wall of the first return air pipe. A rectifying guide vane is provided at the lower end of the first air return pipe, and a bowl-shaped silicone flow guide cleaning member is provided at the lower end of the rectifying guide vane in the cyclone separation drum. The silicone flow guide cleaning member is connected to a driving member that drives it to move up and down, horizontally, and rotate. The silicone flow guide cleaning member is used to guide the furfural gas to the first air return pipe, while shielding it to reduce the furfural residue below from flowing back into the first air return pipe along with the furfural gas. The silicone flow guide cleaning member can extend between the cyclone separation drum and the first air return pipe to clean the furfural residue on the inner wall of the cyclone separation drum. The spray separator includes a spray separation cylinder, a filter is provided near the lower end of the spray separation cylinder, an inner rotating cylinder is provided near the upper end of the spray separation cylinder for rotation, a plurality of hanging lines are provided at the upper end and the lower end of the spray separation cylinder, a plurality of hanging beads are provided on each hanging line, a plurality of protruding feet that can contact the hanging lines above the spray separation cylinder are fixed at the upper end of the inner rotating cylinder, a connecting pipe connected to the first air pipe is provided at the top of the inner rotating cylinder, an air outlet is provided near the upper end of the outer side of the inner rotating cylinder, a discharge port is provided at the bottom end of the inner rotating cylinder, a second return air pipe is provided in the center of the inner rotating cylinder, the upper end of the second return air pipe extends out of the inner rotating cylinder, a plurality of rotating blades are provided on the second return air pipe, a spray pipe is provided on one side of the second return air pipe, a nozzle is provided on the spray pipe in the inner rotating cylinder, the lower end of the spray pipe extends out of the inner rotating cylinder and extends to below the filter.

2. A furfural gas-slag separation device according to claim 1, characterized in that: The gas spiral guide comprises a sleeve ring fixed on the first return pipe, a plurality of arc-shaped guide plates twisted and tilted counterclockwise are fixed on the outside of the sleeve ring, and the outside of the guide plates is fixed on the cyclone separation cylinder.

3. A furfural gas-slag separation device according to claim 1, characterized in that: The lower end of the rectifying guide wing extends out of the first return pipe. The rectifying guide wing includes a plurality of wing plates. The wing plates are arc-shaped. The middle parts of the plurality of wing plates are fixedly connected together, and the lower ends of the wing plates are twisted toward one side in the instantaneous clockwise direction.

4. A furfural gas-slag separation device according to claim 1, characterized in that: The cyclone separation cylinder includes a cylindrical cylinder at the upper end and a conical cylinder at the lower end. The lower end of the conical cylinder is connected to the recovery cylinder. The diameter of the recovery cylinder is larger than the diameter of the bottom port of the conical cylinder. The upper end of the cylindrical cylinder is connected to the furfural inlet pipe through a docking flange.

5. The furfural gas-slag separation device according to claim 1, characterized in that: The driving part includes a sliding rod, a telescopic rod, a slider, a fixed rod and a first motor. The sliding rod is rotatably set on the cyclone separation cylinder, the fixed rod is fixed in the cyclone separation cylinder and is located below the sliding rod, the first motor is provided in the middle of the fixed rod, and the output shaft of the first motor is connected to the sliding rod. The lower end of the silicone guide cleaning part is provided with a telescopic rod, and the bottom end of the telescopic rod is provided with a slider. The slider is slidably set on the sliding rod, and one side of the slider is connected to the electric push rod that drives it to slide.

6. A furfural gas-slag separation device according to claim 1, characterized in that: The inner rotating cylinder includes an upper rotating cover and a lower rotating cylinder. The upper rotating cover is an arc-shaped structure, and the lower rotating cylinder is a conical cylinder. The lower end of the upper rotating cover is bent inward and extends into the lower rotating cylinder. An air outlet is left between the upper rotating cover and the lower rotating cylinder, and the upper rotating cover and the lower rotating cylinder are connected by connecting ribs. The outer side of the lower rotating cylinder is rotatably connected to the spray separation cylinder.

7. A furfural gas-slag separation device according to claim 6, characterized in that: The connecting pipe extends into the inner rotating cylinder and is fixedly connected to the inner rotating cylinder. The upper end of the connecting pipe extends out of the spray separation cylinder and is rotationally connected to the spray separation cylinder. The upper end of the connecting pipe is rotationally connected to the first air pipe.

8. The furfural gas-slag separation device according to claim 7, characterized in that: A first gear is fixed on the connecting pipe, and a second gear is rotatably provided on the upper end of the spray separation cylinder. The first gear and the second gear are meshed and connected, and the second gear is connected to a second motor that drives it to rotate.

9. The furfural gas-slag separation device according to claim 8, characterized in that: The lower end of the spray pipe is provided with stirring blades above the filter screen.

10. A method for separating gas and slag using the furfural gas and slag separation device according to claim 1, characterized in that: The steps include: (1) Primary separation: Furfural gas residue is guided into the cyclone separation cylinder from the upper end of the cyclone separation cylinder through the gas spiral guide. The furfural gas residue entering the cyclone separation cylinder spirally runs downward. The furfural residue in the furfural gas residue is thrown onto the inner wall of the cyclone separation cylinder under the action of centrifugal force and flows downward into the recovery cylinder under the action of gravity. The furfural gas with some furfural residue removed flows from the first reflux pipe to the first gas pipe through the rectification of the rectification guide vane, completing the primary separation of furfural gas residue. (2) Secondary separation and cooling: The inner rotating cylinder and the spray pipe are rotated to open, and the furfural gas residue in the first air pipe enters the inner rotating cylinder through the connecting pipe. The second reflux pipe rotates with the inner rotating cylinder and stirs the furfural gas residue entering the inner rotating cylinder. During the stirring process, the furfural gas residue in the furfural gas residue falls downward from the discharge port to the bottom of the spray separation cylinder under the multiple effects of centrifugal force, spray flushing and gravity. Part of the furfural gas in the furfural gas residue enters the upper end of the inner rotating cylinder from the second reflux pipe, part of it flows out from the gas outlet to the outside of the inner rotating cylinder, and the other part flows downward from the discharge port and deflects upward, completing the secondary separation and cooling of the furfural gas residue; (3) Three-stage separation: During the rotation of the inner rotating drum, the hanging wire and the hanging beads are moved or swung. The furfural residue remaining in the furfural gas entering the hanging wire and the spray liquid carried out flow downward under the blocking filtration, turbulent flow shaking and gravity of the hanging wire, completing the three-stage separation of furfural gas and residue. The separated furfural gas enters the second air pipe; (4) Condensation of furfural gas: Furfural gas enters the condensation box for condensation recovery; (5) Cleaning the inner wall of the cyclone separation tube: After the furfural gas-slag separation work is completed, move the center of the silicone guide cleaning piece to one side to the position below the inner wall of the cyclone separation tube and the outer wall of the first return pipe, move the silicone guide cleaning piece upward so that the silicone guide cleaning piece moves upward to between the inner wall of the cyclone separation tube and the outer wall of the first return pipe, move the silicone guide cleaning piece up and down, and rotate the silicone guide cleaning piece to clean the inner wall of the cyclone separation tube, the outer wall of the first return pipe, and the outer side of the rectifying guide vane.

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