Improved formaldehyde oxidizer

Abstract

This invention provides an improved formaldehyde oxidizer, relating to the technical field of formaldehyde oxidizers. The improved formaldehyde oxidizer includes a shell, with a partition plate installed on the top of the shell. The partition plate has a reaction structure for producing formaldehyde gas. Inside the shell, two sets of upper and lower annular supports are fixed, and a metal deformation cylinder is installed between the two sets of annular supports. Inside the metal deformation cylinder, a heat exchange structure for separating and cooling the formaldehyde gas is installed. Below the metal deformation cylinder, an S-shaped cooling cylinder is installed, with a cooling structure for cooling the formaldehyde gas. This improved formaldehyde oxidizer generates formaldehyde gas by mixing methanol gas, air, and feed vapor and introducing the mixture into the shell. The metal deformation cylinder first separates and pre-cools the gas, and then the S-shaped cooling cylinder provides efficient cooling, improving the cooling effect.

Description

Technical Field

[0001] This invention relates to the field of formaldehyde oxidizer technology, specifically to an improved formaldehyde oxidizer. Background Technology

[0002] Formaldehyde oxidizers are one of the main equipment for formaldehyde production. The main production methods of formaldehyde include the silver process and the iron-molybdenum process. In the oxidation reaction of formaldehyde production by the silver process, the reaction rate will be accelerated if the reaction temperature is too high. However, since formaldehyde is easy to decompose at high temperature, it will reduce the formaldehyde yield. Therefore, it is necessary to cool the produced formaldehyde gas in time.

[0003] Patent application number CN201921160733.6 discloses a high-efficiency formaldehyde oxidizer, comprising a first cylinder, a second cylinder, a third cylinder, and a fourth cylinder connected in sequence. The first cylinder is provided with a reaction gas inlet. The second cylinder includes a reaction chamber, a first cooling chamber, and a second cooling chamber. The third cylinder is provided with a formaldehyde outlet. The fourth cylinder is provided with a first drain outlet. A first tube sheet is provided between the reaction chamber and the first cooling chamber. A second tube sheet is provided between the first cooling chamber and the second cooling chamber. An ignition port and a first temperature measuring port are provided on the wall of the reaction chamber. A catalyst layer, a copper mesh, and a sieve plate are provided inside the reaction chamber. A finned tube is provided inside the first cooling chamber, and cooling water is provided inside the finned tube. The finned tube passes through the first cooling chamber, the second tube sheet, the second cooling chamber, and the third cylinder in sequence. A sleeve and cooling water are provided inside the second cooling chamber. The sleeve is fitted onto the finned tube, and a second cooling medium is located outside the sleeve.

[0004] When in use, the aforementioned patented structure primarily cools the gas simultaneously through the sleeve and finned tube, thereby achieving the purpose of cooling formaldehyde gas. However, when cooling formaldehyde gas, it is inconvenient to separate the generated formaldehyde gas into multiple streams for individual cooling. Furthermore, due to the relatively fast flow rate of the formaldehyde gas, and the inconvenience of altering the flow path of the formaldehyde gas within the sleeve and finned tube, the formaldehyde gas passes through the sleeve and finned tube at a relatively high speed, thus reducing the cooling effect of the sleeve and finned tube on the formaldehyde gas. Summary of the Invention

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this invention provides an improved formaldehyde oxidizer, which solves the problem that when cooling formaldehyde gas, it is inconvenient to separate the gas into multiple streams for individual cooling, and it is inconvenient to increase the gas travel distance inside the cold zone tube, thereby reducing the cooling effect on formaldehyde gas.

[0007] (II) Technical Solution

[0008] To achieve the goal of separating formaldehyde gas into multiple streams for individual cooling in the above formaldehyde oxidizer, thereby increasing the gas travel distance inside the cold zone tube and reducing the cooling effect on formaldehyde gas, the present invention achieves this through the following technical solution: An improved formaldehyde oxidizer includes a shell, a partition plate installed on the top of the shell, a reaction structure for producing formaldehyde gas provided on the partition plate, two sets of upper and lower annular supports fixed inside the shell, a metal deformation cylinder installed between the two sets of annular supports, a heat exchange structure for separating and cooling formaldehyde gas inside the metal deformation cylinder, and an S-shaped cooling cylinder installed below the metal deformation cylinder, a cooling structure for cooling formaldehyde gas inside the S-shaped cooling cylinder;

[0009] The outer casing includes a top cover and a bottom cover. The top cover is fixed to the top of the outer casing by bolts, and the bottom cover is fixed to the bottom of the outer casing by bolts. An air inlet pipe is fixed on the top cover, and an air outlet pipe is fixed on the bottom cover. A cooling fan is installed in the middle of the surface of the outer casing, and a circulating cooling pump is installed below the surface of the outer casing.

[0010] Preferably, the partition is installed and fixed in the gap between the outer shell and the top cover. The reaction structure includes a catalytic reaction plate and a screen. The catalytic reaction plate is fixed above the partition, and the screen is fixed below the partition. A gas distributor is installed on the bottom surface of the partition. A gas guide pipe is installed on the gas distributor, and the gas guide pipe passes through the annular support above and extends into the interior of the metal deformation cylinder.

[0011] Preferably, the catalytic reaction plate has through holes and is located above the sieve.

[0012] Preferably, the gas guide tubes are provided in eight groups and are equidistantly distributed along the circumference of the gas distributor, and the gas tube at the top of the gas distributor extends to the top of the partition.

[0013] Preferably, the annular support is located below the partition, the metal deformation cylinder is located between the upper and lower annular supports, the heat exchange structure includes a tripod, and one end of the tripod is fixed to the annular support by the support. A hinge block is installed on the metal deformation cylinder, and an electric rod is rotatably connected between the tripod and the hinge block. An upper partition plate is fixed above the inner wall of the metal deformation cylinder, and a lower partition plate is fixed below the inner wall of the metal deformation cylinder. An upper cooling pipe is provided inside the metal deformation cylinder, heat dissipation fins are installed on the surface of the upper cooling pipe, and an upper U-shaped guide pipe is installed at the top of the upper cooling pipe.

[0014] Preferably, the other two ends of the tripod are connected to two sets of electric rods via pivot pins, and the electric rods are rotatably connected to the metal deformation cylinder via hinge blocks. The metal deformation cylinder, the upper partition plate, and the lower partition plate are all made of metal, and the heat dissipation fins are connected to the upper cooling pipe.

[0015] Preferably, the upper and lower partitions are triangular in shape, with the outer width being greater than the inner width. There are four sets of upper U-shaped guide pipes and eight sets of upper cooling pipes. The two ends of the upper U-shaped guide pipes are connected to the two adjacent sets of upper cooling pipes.

[0016] Preferably, the S-shaped cooling cylinder is fixed to the bottom surface of the lower annular support. The cooling structure includes an air inlet, which is located on the end face of the lower annular support. An inner cavity is formed on the inner side of the S-shaped cooling cylinder, and the diameter of the inner cavity is matched with the diameter of the air inlet. An outer cavity is formed on the outer side of the S-shaped cooling cylinder. A lower cooling pipe is provided inside the inner cavity, and the lower cooling pipe is fixedly connected to the upper cooling pipe. A lower U-shaped guide pipe is installed at the bottom end of the lower cooling pipe. Spiral exchange grooves are formed on the lower cooling pipe and the inner cavity. Spiral blades are fixed at the ports of the spiral exchange grooves on both the inner and outer sides. Spiral grooves are formed inside the spiral blades. The gap between the upper surface of the spiral blades and the inner wall of the inner cavity forms a spiral air outlet.

[0017] Preferably, the air guide pipe, the metal deformation cylinder, the air inlet, and the air outlet are connected. There are four sets of lower U-shaped guide pipes, one of which is connected to the circulating cooling pump. There are eight sets of lower cooling pipes. The two ends of the lower U-shaped guide pipe are connected to the two adjacent sets of lower cooling pipes. The upper U-shaped guide pipes and the lower U-shaped guide pipes are staggered.

[0018] Preferably, the two sides of the spiral blade are fixedly connected to the surface of the lower cooling pipe and the inner wall of the inner cavity, and the lower cooling pipe, the spiral exchange channel, the spiral groove and the outer cavity are connected, with the top and bottom of the outer cavity in a closed state.

[0019] (III) Beneficial Effects

[0020] This invention provides an improved formaldehyde oxidizer. It has the following beneficial effects:

[0021] 1. During the deformation of the metal deformation cylinder, the upper and lower partition plates move in a cross pattern. This allows the upper and lower partition plates to cut and disperse the downward-moving gas, changing its direction of movement. As the gas moves downward, it adheres to the inner wall of the metal deformation cylinder. The upper and lower partition plates increase the contact area with the gas, enabling heat exchange between the gas and the metal deformation cylinder, as well as the upper and lower partition plates. This allows for the uniform cooling of the separated gas streams.

[0022] 2. The coolant inside the circulating cooling pump can circulate between the lower U-shaped guide pipe, the lower cooling pipe, the upper cooling pipe, and the upper U-shaped guide pipe. As the gas flows downward inside the metal deformation cylinder, the coolant can fill the interior of the upper cooling pipe and the heat dissipation fins. The heat dissipation fins can increase the contact area with the gas, thereby further improving the heat exchange efficiency of the gas and thus improving the cooling effect of the gas.

[0023] 3. The gas inside the metal deformation cylinder flows downward in a spiral shape through the inlet into the outlet chamber, thereby increasing the gas's travel distance within the outlet chamber. As the gas flows downward in a spiral direction within the outlet chamber, the coolant flowing through the lower cooling pipe cools the gas from the inside, the coolant flowing through the outer chamber cools the gas from the outside, and the coolant flowing through the spiral groove cools the gas from below, thus further improving the cooling effect on the gas. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the present invention;

[0025] Figure 2 This is a partial cross-sectional view of the structure of the present invention;

[0026] Figure 3 For the present invention Figure 2 Enlarged schematic diagram of a portion of the structure at point A;

[0027] Figure 4 This is a top view of the metal deformation cylinder structure of the present invention;

[0028] Figure 5 For the present invention Figure 4 Enlarged schematic diagram of the structure at point B in the middle;

[0029] Figure 6 This is a schematic diagram of the S-shaped cooling cylinder structure of the present invention;

[0030] Figure 7 This is a main sectional view of the S-shaped cooling cylinder of the present invention;

[0031] Figure 8 For the present invention Figure 7 A magnified view of the structure at point C.

[0032] The components include: 1. Outer shell; 101. Top cover; 102. Inlet pipe; 103. Bottom cover; 104. Outlet pipe; 105. Cooling fan; 106. Circulating cooling pump; 2. Partition plate; 201. Catalytic reaction plate; 202. Screen; 203. Gas distributor; 204. Guide pipe; 3. Annular support; 4. Metal deformation cylinder; 401. Tripod; 402. Hinge block; 403. Electric rod; 404. Upper partition plate; 405. Lower partition plate; 406. Upper cooling pipe; 407. Heat dissipation fins; 408. Upper U-shaped guide pipe; 5. S-shaped cooling cylinder; 501. Inlet; 502. Inner cavity; 503. Outer cavity; 504. Lower cooling pipe; 505. Lower U-shaped guide pipe; 506. Spiral exchange channel; 507. Spiral blade; 508. Spiral groove; 509. Outlet chamber. Detailed Implementation

[0033] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances.

[0034] Please see Figures 1-8 The present invention provides a technical solution: an improved formaldehyde oxidizer, including a shell 1, a partition 2 installed on the top of the shell 1, a reaction structure for producing formaldehyde gas provided on the partition 2, two sets of upper and lower annular supports 3 fixed inside the shell 1, a metal deformation cylinder 4 installed between the two sets of upper and lower annular supports 3, a heat exchange structure for separating and cooling the formaldehyde gas provided inside the metal deformation cylinder 4, and an S-shaped cooling cylinder 5 installed below the metal deformation cylinder 4, a cooling structure for cooling the formaldehyde gas provided inside the S-shaped cooling cylinder 5;

[0035] The outer casing 1 includes a top cover 101 and a bottom cover 103. The top cover 101 is fixed to the top of the outer casing 1 by bolts, and the bottom cover 103 is fixed to the bottom of the outer casing 1 by bolts. An air inlet pipe 102 is fixed on the top cover 101, and an air outlet pipe 104 is fixed on the bottom cover 103. A cooling fan 105 is installed in the middle of the surface of the outer casing 1, and a circulating cooling pump 106 is installed below the surface of the outer casing 1. A mixture of methanol gas, air, and feed vapor is introduced into the catalytic reaction plate 201 through the air inlet pipe 102. The gas generated by the reaction escapes downward from the through holes on the catalytic reaction plate 201 and passes through the screen 202 to block the impurities generated by the reaction, so that only the gas can be cooled afterward.

[0036] In this embodiment, the partition 2 is installed and fixed in the gap between the outer shell 1 and the top cover 101. The reaction structure includes a catalytic reaction plate 201 and a screen 202. The catalytic reaction plate 201 is fixed above the partition 2, and the screen 202 is fixed below the partition 2. A gas distributor 203 is installed on the bottom surface of the partition 2. A gas guide pipe 204 is installed on the gas distributor 203, and the gas guide pipe 204 passes through the annular support 3 above and extends into the interior of the metal deformation cylinder 4.

[0037] Specifically, see the instruction manual. Figure 2 Included with instruction manual Figure 3 As shown, when a mixture of methanol gas, air, and feed vapor is introduced onto the catalytic reaction plate 201, the mixture reacts on the catalytic reaction plate 201 to generate gas. The generated gas escapes downward and is collected by the gas distributor 203. The gas is then evenly distributed to each gas guide pipe 204 so that the gas guide pipe 204 can deliver the generated gas to each metal deformation cylinder 4, thereby separating the gas into multiple streams for subsequent cooling treatment.

[0038] In this embodiment, the catalytic reaction plate 201 is provided with through holes, and the catalytic reaction plate 201 is located above the sieve 202;

[0039] Specifically, the gas generated by the mixture on the catalytic reaction plate 201 can escape downward through the through holes, while the screen 202 can filter the impurities generated during the reaction process to prevent them from entering the gas distributor 203.

[0040] In this embodiment, eight sets of air guide tubes 204 are provided and are equidistantly distributed along the circumferential direction of the gas distributor 203. The air tube at the top of the gas distributor 203 extends to the top of the partition 2.

[0041] Specifically, the gas distributor 203 can transport the gas generated by the reaction to the eight metal deformation cylinders 4 through the eight sets of gas guide pipes 204, thereby dividing the gas generated by the reaction into eight groups so that the eight groups of gas can be uniformly cooled in the subsequent process.

[0042] In this embodiment, the annular support 3 is located below the partition 2, and the metal deformation cylinder 4 is located between the upper and lower annular supports 3. The heat exchange structure includes a tripod 401, and one end of the tripod 401 is fixed to the annular support 3 by a bracket. A hinge block 402 is installed on the metal deformation cylinder 4. An electric rod 403 is rotatably connected between the tripod 401 and the hinge block 402. An upper partition plate 404 is fixed above the inner wall of the metal deformation cylinder 4, and a lower partition plate 405 is fixed below the inner wall of the metal deformation cylinder 4. An upper cooling pipe 406 is provided inside the metal deformation cylinder 4. Heat dissipation fins 407 are installed on the surface of the upper cooling pipe 406, and an upper U-shaped guide pipe 408 is installed at the top of the upper cooling pipe 406.

[0043] Specifically, see the instruction manual. Figure 4 Included with instruction manual Figure 5 As shown, when the gas moves from top to bottom inside the metal deformation cylinder 4, the electric rod 403 can drive the metal deformation cylinder 4 to deform and expand. Therefore, the metal deformation cylinder 4 can drive the upper partition plate 404 and the lower partition plate 405 to move. The upper partition plate 404 and the lower partition plate 405 can cut the downward moving gas, so that the cut gas can be close to the inner wall of the metal deformation cylinder 4. Thus, the heat in the gas can be exchanged and dissipated into the outer shell 1 through the metal deformation cylinder 4, the upper partition plate 404 and the lower partition plate 405.

[0044] In this embodiment, the other two ends of the tripod 401 are connected to two sets of electric rods 403 via pivot pins, and the electric rods 403 are rotatably connected to the metal deformation cylinder 4 via hinge block 402. The metal deformation cylinder 4, the upper partition plate 404 and the lower partition plate 405 are all made of metal, and the heat dissipation fins 407 are connected to the upper cooling pipe 406.

[0045] Specifically, one end of the tripod 401 is fixedly connected to the ring bracket 3 via a support, and the other two ends of the tripod 401 are rotatably connected to two sets of electric rods 403. The electric rods 403 are electric telescopic rods, which work by converting the rotational motion of the motor into linear motion. The electric telescopic rods can increase or decrease their stroke by changing the length of the lever arm. The stroke control device can ensure that the electric telescopic rods stop accurately within the set stroke range. The inner end of the electric rod 403 is rotatably connected to both sides of the metal deformation cylinder 4 via a hinge block 402. When the two sets of electric rods 403 extend or retract at the same time, they can drive the metal deformation cylinder 4 to deform.

[0046] In this embodiment, the upper partition 404 and the lower partition 405 are triangular in shape, and the outer width is greater than the inner width. There are four sets of upper U-shaped guide pipes 408 and eight sets of upper cooling pipes 406. The two ends of the upper U-shaped guide pipes 408 are connected to the two adjacent sets of upper cooling pipes 406.

[0047] Specifically, multiple sets of upper partition plates 404 and lower partition plates 405 are arranged along the height direction of the metal deformation cylinder 4. When the gas moves downward inside the metal deformation cylinder 4, the upper partition plates 404 and lower partition plates 405 can continuously cut the gas to change the direction of gas movement, so that the gas can get closer to the inner wall of the metal deformation cylinder 4.

[0048] In this embodiment, the S-shaped cooling cylinder 5 is fixed to the bottom surface of the lower annular support 3. The cooling structure includes an air inlet 501, which is opened on the end face of the lower annular support 3. An inner cavity 502 is opened on the inner side of the S-shaped cooling cylinder 5, and the diameter of the inner cavity 502 is adapted to the diameter of the air inlet 501. An outer cavity 503 is opened on the outer side of the S-shaped cooling cylinder 5. A lower cooling pipe 504 is provided inside the inner cavity 502, and the lower cooling pipe 504 is fixedly connected to the upper cooling pipe 406. A lower U-shaped guide pipe 505 is installed at the bottom end of the lower cooling pipe 504. A spiral exchange groove 506 is opened on the lower cooling pipe 504 and the inner cavity 502. A spiral blade 507 is fixed at the port of the spiral exchange groove 506 on both the inner and outer sides. A spiral groove 508 is opened inside the spiral blade 507. The gap between the upper surface of the spiral blade 507 and the inner wall of the inner cavity 502 forms a spiral air outlet 509.

[0049] Specifically, see the instruction manual. Figure 6 Instruction manual attached Figure 7 and instruction manual Figure 8 As shown, the gas inside the metal deformation cylinder 4 enters the outlet chamber 509 through the inlet 501 and moves downward in a spiral shape inside the outlet chamber 509. The coolant inside the upper cooling pipe 406 enters the lower cooling pipe 504 and then enters the outer cavity 503 through the spiral exchange channel 506 and the spiral groove 508. Therefore, the coolant flowing through the lower cooling pipe 504, the outer cavity 503, and the spiral groove 508 can simultaneously cool the gas to improve the cooling effect.

[0050] In this embodiment, the air guide pipe 204, the metal deformation cylinder 4, the air inlet 501 and the air outlet 509 are connected. There are four sets of lower U-shaped guide pipes 505, and one set of lower U-shaped guide pipes 505 is connected to the circulating cooling pump 106. There are eight sets of lower cooling pipes 504. The two ends of the lower U-shaped guide pipes 505 are connected to the two adjacent sets of lower cooling pipes 504. The upper U-shaped guide pipes 408 and the lower U-shaped guide pipes 505 are arranged alternately.

[0051] Specifically, see the instruction manual. Figure 2 As shown, the coolant forms an S-shaped loop by connecting the circulating cooling pump 106, the lower U-shaped guide pipe 505, the lower cooling pipe 504, the upper cooling pipe 406, and the upper U-shaped guide pipe 408 end to end. After the circulating cooling pump 106 is started, the coolant inside it first flows into the lower cooling pipe 504 through one end of a set of lower U-shaped guide pipes 505, so that the coolant can circulate in a complete S-shaped closed loop between the circulating cooling pump 106, the lower U-shaped guide pipe 505, the lower cooling pipe 504, the upper cooling pipe 406, and the upper U-shaped guide pipe 408. The metal deformation cylinder 4 is made of nickel-titanium shape memory alloy. Shape memory alloys are a type of material with unique physical properties. They can recover their original shape at a specific temperature. The shape memory effect of nickel-titanium alloys comes from the reversible change of their internal crystal structure. At a specific temperature, this phase transformation process is reversible, which allows nickel-titanium alloys to be repeatedly deformed and recovered. This characteristic makes shape memory alloys widely used in aerospace, medical devices, and mechanical engineering.

[0052] In this embodiment, the two sides of the spiral blade 507 are fixedly connected to the surface of the lower cooling pipe 504 and the inner wall of the inner cavity 502. The lower cooling pipe 504, the spiral exchange channel 506, the spiral groove 508 and the outer cavity 503 are connected. The top and bottom ends of the outer cavity 503 are in a closed state.

[0053] Specifically, the inner port of the spiral groove 508 is connected to the lower cooling pipe 504 through the internal spiral exchange channel 506, and the outer port of the spiral groove 508 is connected to the outer cavity 503 through the external spiral exchange channel 506. The exhaust chamber 509 is spiral in shape and is not connected to the lower cooling pipe 504 and the outer cavity 503, so that the gas can flow downward inside the exhaust chamber 509, and the coolant can flow downward inside the lower cooling pipe 504, the spiral groove 508 and the outer cavity 503.

[0054] The working principle and usage process of this invention are as follows: A mixture of methanol gas, air, and ingredient vapor is introduced into the catalytic reaction plate 201 through the air inlet pipe 102. The gas generated by the reaction escapes downward from the through holes on the catalytic reaction plate 201, passes through the screen 202, and is first collected by the gas distributor 203. The screen 202 can block impurities generated by the reaction. After collecting the gas, the gas distributor 203 evenly delivers it to eight sets of gas guide pipes 204. At this time, the eight sets of gas guide pipes 204 can deliver the gas to eight sets of metal deformation cylinders 4, and make the gas move from top to bottom in the metal deformation cylinders 4. Therefore, the gas can be separated into multiple streams. During the process of the gas moving from top to bottom inside the metal deformation cylinders 4, the gas flows through the screen 202 and then into the catalytic reaction plate 201. The extension and retraction of the electric rod 403 can cause the metal deformation cylinder 4 to deform, allowing the cavity of the metal deformation cylinder 4 to expand or shrink. At this time, the top and bottom ends of the metal deformation cylinder 4 are slidably connected to the end faces of the upper and lower annular supports 3, so that a closed cavity can be formed inside the metal deformation cylinder 4. During the deformation process of the metal deformation cylinder 4, the upper partition plate 404 and the lower partition plate 405 can be driven to move in a cross shape and change the angle of the cross. Thus, the upper partition plate 404 and the lower partition plate 405 can cut and disperse the downward moving gas to both sides, changing the direction of gas movement. This allows the gas to move downward close to the inner wall of the metal deformation cylinder 4 during its downward movement, and pass through the upper partition plate 404 and the lower partition plate 405. 5 increases the contact area with the gas, allowing heat exchange between the gas and the metal deformation cylinder 4, upper partition 404, and lower partition 405. This enables the metal deformation cylinder 4 to discharge heat into the outer casing 1, while the cooling fan 105 rapidly dissipates heat from inside the outer casing 1, thus uniformly cooling the separated gas streams. Furthermore, the circulating cooling pump 106, lower U-shaped guide pipe 505, lower cooling pipe 504, upper cooling pipe 406, and upper U-shaped guide pipe 408 form a complete closed loop, allowing the coolant inside the circulating cooling pump 106 to circulate among these pipes. Therefore, when the gas is in the metal... During the downward flow of coolant inside the metal deformation cylinder 4, the coolant fills the interior of the upper cooling pipe 406 and the heat dissipation fins 407. The heat dissipation fins 407 increase the contact area with the gas, thereby further improving the heat exchange efficiency of the gas and enhancing the cooling effect. The gas inside the metal deformation cylinder 4 enters the outlet chamber 509 after passing through the inlet 501, and flows downward in a spiral shape inside the outlet chamber 509, thereby increasing the gas's travel distance within the outlet chamber 509. During this process, the coolant inside the upper cooling pipe 406 flows into the lower cooling pipe 504, and then the coolant inside the lower cooling pipe 504 enters the outer cavity 503 after passing through the spiral exchange channel 506 and the spiral groove 508.Therefore, after filling the lower cooling pipe 504, spiral groove 508, and outer cavity 503, the coolant flows downwards and finally flows into the lower U-shaped guide pipe 505. Thus, during the downward spiral flow of gas inside the exhaust chamber 509, the coolant flowing through the lower cooling pipe 504 cools the gas from the inside, the coolant flowing through the outer cavity 503 cools the gas from the outside, and the coolant flowing through the spiral groove 508 cools the gas from below, thereby further improving the cooling effect. The cooled gas is then discharged from the port below the S-shaped cooling cylinder 5 into the bottom cover 103 and finally discharged through the exhaust pipe 104.

[0055] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An improved formaldehyde oxidizer, comprising a housing (1), characterized in that: A partition (2) is installed on the top of the outer shell (1). A reaction structure for producing formaldehyde gas is provided on the partition (2). Two sets of upper and lower annular supports (3) are fixed inside the outer shell (1). A metal deformation cylinder (4) is installed between the upper and lower annular supports (3). A heat exchange structure for separating and cooling formaldehyde gas is provided inside the metal deformation cylinder (4). An S-shaped cooling cylinder (5) is installed below the metal deformation cylinder (4). A cooling structure for cooling formaldehyde gas is provided inside the S-shaped cooling cylinder (5). The outer casing (1) includes a top cover (101) and a bottom cover (103). The top cover (101) is fixed to the top of the outer casing (1) by bolts, and the bottom cover (103) is fixed to the bottom of the outer casing (1) by bolts. An air inlet pipe (102) is fixed on the top cover (101), and an air outlet pipe (104) is fixed on the bottom cover (103). A cooling fan (105) is installed in the middle of the surface of the outer casing (1), and a circulating cooling pump (106) is installed below the surface of the outer casing (1).

2. The improved formaldehyde oxidizer according to claim 1, characterized in that: The partition (2) is installed and fixed in the gap between the outer shell (1) and the top cover (101). The reaction structure includes a catalytic reaction plate (201) and a screen (202). The catalytic reaction plate (201) is fixed above the partition (2), and the screen (202) is fixed below the partition (2). A gas distributor (203) is installed on the bottom surface of the partition (2). A gas guide pipe (204) is installed on the gas distributor (203), and the gas guide pipe (204) passes through the annular support (3) above and extends into the interior of the metal deformation cylinder (4).

3. An improved formaldehyde oxidizer according to claim 2, characterized in that: The catalytic reaction plate (201) has through holes and is located above the sieve (202).

4. An improved formaldehyde oxidizer according to claim 2, characterized in that: The gas duct (204) is provided in eight groups and is equidistantly distributed along the circumference of the gas distributor (203). The gas duct at the top of the gas distributor (203) extends to the top of the partition (2).

5. An improved formaldehyde oxidizer according to claim 2, characterized in that: The annular support (3) is located below the partition (2), and the metal deformation cylinder (4) is located between the upper and lower annular supports (3). The heat exchange structure includes a tripod (401), and one end of the tripod (401) is fixed to the annular support (3) by the support. A hinge block (402) is installed on the metal deformation cylinder (4). An electric rod (403) is rotatably connected between the tripod (401) and the hinge block (402). An upper partition plate (404) is fixed above the inner wall of the metal deformation cylinder (4), and a lower partition plate (405) is fixed below the inner wall of the metal deformation cylinder (4). An upper cooling pipe (406) is provided inside the metal deformation cylinder (4). Heat dissipation fins (407) are installed on the surface of the upper cooling pipe (406), and an upper U-shaped guide pipe (408) is installed at the top of the upper cooling pipe (406).

6. An improved formaldehyde oxidizer according to claim 5, characterized in that: The other two ends of the tripod (401) are connected by two sets of electric rods (403) through pivot pins, and the electric rods (403) are rotatably connected to the metal deformation cylinder (4) through the hinge block (402). The metal deformation cylinder (4), the upper partition plate (404) and the lower partition plate (405) are all made of metal. The heat dissipation fins (407) are connected to the upper cooling pipe (406).

7. An improved formaldehyde oxidizer according to claim 5, characterized in that: The upper partition (404) and lower partition (405) are triangular in shape, with the outer width being greater than the inner width. The upper U-shaped guide pipe (408) is provided in four groups, and the upper cooling pipe (406) is provided in eight groups. The two ends of the upper U-shaped guide pipe (408) are connected to the two adjacent groups of upper cooling pipes (406).

8. An improved formaldehyde oxidizer according to claim 5, characterized in that: The S-shaped cooling cylinder (5) is fixed to the bottom surface of the lower annular support (3). The cooling structure includes an air inlet (501), which is located on the end face of the lower annular support (3). An inner cavity (502) is provided on the inner side of the S-shaped cooling cylinder (5), and the diameter of the inner cavity (502) is matched with the diameter of the air inlet (501). An outer cavity (503) is provided on the outer side of the S-shaped cooling cylinder (5). A lower cooling pipe (504) is provided inside the inner cavity (502), and the lower cooling pipe (504) is connected to the upper cooling pipe. The cooling pipe (406) is fixedly connected, and a lower U-shaped guide pipe (505) is installed at the bottom end of the lower cooling pipe (504). A spiral exchange channel (506) is opened on the lower cooling pipe (504) and the inner cavity (502). A spiral blade (507) is fixed at the port of the spiral exchange channel (506) on both the inner and outer sides. A spiral groove (508) is opened inside the spiral blade (507). The gap between the upper surface of the spiral blade (507) and the inner wall of the inner cavity (502) forms a spiral air outlet chamber (509).

9. An improved formaldehyde oxidizer according to claim 8, characterized in that: The air guide pipe (204), metal deformation cylinder (4), air inlet (501) and air outlet (509) are connected. There are four sets of lower U-shaped guide pipes (505), and one set of lower U-shaped guide pipes (505) is connected to the circulating cooling pump (106). There are eight sets of lower cooling pipes (504). The two ends of the lower U-shaped guide pipes (505) are connected to the two adjacent sets of lower cooling pipes (504). The upper U-shaped guide pipes (408) and lower U-shaped guide pipes (505) are staggered.

10. An improved formaldehyde oxidizer according to claim 8, characterized in that: The two sides of the spiral blade (507) are fixedly connected to the surface of the lower cooling pipe (504) and the inner wall of the inner cavity (502). The lower cooling pipe (504), the spiral exchange channel (506), the spiral groove (508) and the outer cavity (503) are connected. The top and bottom of the outer cavity (503) are in a closed state.

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