Separating device for formaldehyde production

Abstract

The present application relates to the technical field of formaldehyde production, and particularly relates to a separation device for formaldehyde production, which comprises an outer cylinder, and further comprises: an inner cylinder, which forms a temperature control layer with the outer cylinder; a vacuum pump, an output shaft of the vacuum pump being connected to the inside of the inner cylinder through a connecting pipe; an exhaust port, which is connected to the top of the inner cylinder; a liquid discharge port, which is connected to the bottom of the inner cylinder; a feed port, which is connected to the middle of the inner cylinder; a vortex separation assembly, an input end of which is connected to the feed port, which is used for guiding the vortex of the formaldehyde solution to evaporate water under a high-pressure environment for separation, and guiding gas-liquid separation through gradually increasing width; a temperature control unit, which is used for controlling the temperature inside the outer cylinder; the device is provided with the vortex separation assembly, so that the formaldehyde solution flows along the vortex separation assembly to the inner ring, and then flows downward along the increase of the width, the separation effect of the two is increased, the liquid flow in the formaldehyde solution is prevented from flowing upward and then being mixed and discharged with the gas flow, and the separation effect of water is improved.

Description

Technical Field

[0001] This invention relates to the field of formaldehyde production, and more particularly to a separation device for formaldehyde production. Background Technology

[0002] Separation devices for formaldehyde production refer to specialized equipment used to separate and purify formaldehyde from formaldehyde mixtures to obtain high-purity formaldehyde products. In the industrial production of formaldehyde, the crude formaldehyde produced by the reaction often contains methanol, water, and other impurities, which need to be purified by separation devices. Common separation devices mainly include formaldehyde separation towers and formaldehyde absorption towers, which are usually based on physical methods, such as distillation or rectification using the difference in boiling points of the components, or absorption using the difference in solubility of gases in liquids.

[0003] In existing technologies, when separating formaldehyde during the production process, heating is carried out in a vacuum environment. This causes the water in the formaldehyde aqueous solution to boil and vaporize at low temperature in a near-vacuum environment, thus separating the water vapor and obtaining a high-concentration formaldehyde solution. However, during the separation process, prolonged exposure can lead to formaldehyde gas escaping and being separated along with the steam, or some liquid flowing with the gas flow and being separated, resulting in incomplete separation and affecting the separation efficiency of the device. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a separation device for formaldehyde production.

[0005] This invention provides a separation device for formaldehyde production, including an outer cylinder, and further comprising:

[0006] The inner cylinder is fixed inside the outer cylinder, forming a temperature control layer between the inner and outer cylinders;

[0007] A vacuum pump is fixed to the outer wall of the outer cylinder, and the output shaft of the vacuum pump is connected to the interior of the inner cylinder through a connecting pipe;

[0008] An exhaust port is installed at the top of the outer cylinder and connects to the top of the inner cylinder;

[0009] A drain outlet is installed at the bottom of the outer cylinder and communicates with the bottom of the inner cylinder;

[0010] The feed inlet is fixed in the middle of the inner cylinder and communicates with the middle of the inner cylinder;

[0011] The vortex separation component is installed inside the inner cylinder, with its input end connected to the feed port. It is used to guide the formaldehyde solution into the vortex and then separate it by evaporating water under high pressure. The gas-liquid separation is also guided by the gradually increasing width.

[0012] A temperature control unit is installed inside the outer cylinder to control the temperature inside the outer cylinder;

[0013] During operation, the staff connects the external high-temperature airflow generating device to the temperature control unit, allowing the high-temperature airflow to pass through the inside of the temperature control unit to control the temperature of the entire device. The vacuum pump is started to evacuate the inside of the inner cylinder, so that after the formaldehyde solution enters the inner cylinder through the feed port, the water in the formaldehyde solution boils and vaporizes at a lower temperature in a near-vacuum environment, thereby separating the water in the formaldehyde solution and increasing the concentration of the formaldehyde solution. The vaporized water vapor is discharged through the exhaust port, while the formaldehyde solution is discharged from the drain port at the bottom.

[0014] The vortex separator is designed such that, when connected to the inlet tangentially to the inner cylinder, the formaldehyde solution flows in a vortex shape along the separator. During this vortex flow, the water in the formaldehyde solution vaporizes in a near-vacuum environment after being heated by the temperature control unit. The vaporized airflow flows towards the inner ring of the vortex separator. Due to the increased width of the inner ring, the vaporized airflow separates from the formaldehyde solution. The formaldehyde solution then flows downwards along the increased width of the vortex separator, thus enhancing the separation effect. The vortex separator increases the length of the vortex flow path for the formaldehyde solution, thereby improving the separation effect and preventing the liquid in the formaldehyde solution from mixing and being discharged after flowing upwards with the airflow, thus improving the separation effect of water.

[0015] Preferably, the vortex separation assembly includes:

[0016] A vortex channel is fixed at the center of the inner cylinder. The vortex channel is vortex-shaped and its vertical width gradually increases from the outer ring to the inner ring.

[0017] The connection port is fixedly connected between the input end of the vortex channel and the feed port;

[0018] The straight end is fixedly connected to the center of the inner ring of the vortex channel and is smoothly connected to the vortex channel;

[0019] The liquid outlet is located at the bottom of the straight pipe end;

[0020] An airflow outlet is located at the top of the straight pipe end;

[0021] The vortex channel is vortex-shaped, and its vertical width gradually increases towards the inner circle. This allows the formaldehyde solution to flow into the vortex channel, where the water vaporizes and separates, gradually flowing upwards while the solution flows downwards, creating a two-way separation during the flow process. This separation continues until the straight pipe end is reached. At this point, the vaporized steam flows upwards and is discharged along the airflow outlet, while the formaldehyde solution flows downwards along the lower liquid outlet to the bottom of the inner cylinder, thus separating the two. This helps to prevent some of the formaldehyde solution from flowing out with the airflow after it has rotated and flowed into the inner cylinder, affecting the separation effect.

[0022] Preferably, the temperature control unit includes:

[0023] A steam passage is formed inside the side wall of the vortex passage;

[0024] A partition is fixed in the middle of the steam channel, dividing the steam channel into an upper and lower path, and the upper and lower paths are connected at the inner end;

[0025] The first input port is connected to the upper path of the steam channel;

[0026] The first output port is connected to the lower path of the steam channel;

[0027] The second output port is fixed to the top of the outer cylinder and is connected to the temperature control layer;

[0028] The second input port is fixed to the bottom of the outer cylinder and is connected to the temperature control layer;

[0029] A vortex guide plate is fixedly installed inside the temperature control layer;

[0030] The high-temperature airflow generated by the external high-temperature airflow generator enters through the first and second inlets. The airflow entering through the first inlet is guided by the vortex guide plate through the temperature control layer and then exits through the second outlet, thereby controlling the temperature inside the temperature control layer and the temperature of the entire inner cylinder. The airflow entering through the second inlet flows along the upper path of the steam channel, then through the lower path of the steam channel and exits through the first outlet. As the formaldehyde solution flows along the vortex, it aligns with the vortex channel for heating, thus forming a uniform heating environment to promote water evaporation and separation. This facilitates temperature control of both the whole device and its local areas, improves the uniformity of temperature control, and enhances the effect of formaldehyde solution water separation.

[0031] Preferably, the vortex separation assembly further includes:

[0032] A plug-in interface is installed inside the airflow outlet.

[0033] A curved guide tube is fixedly connected to the top of the insertion interface;

[0034] An opening is formed at the top of the curved guide tube.

[0035] Preferably, the vortex separation assembly further includes:

[0036] The inner cavity is formed inside the inner wall of the curved guide tube and the insertion interface;

[0037] A connecting opening is formed between the outer wall of the insertion port and the inner wall of the airflow outlet, creating a connection between the inner cavity and the steam passage.

[0038] Preferably, it further includes:

[0039] A baffle plate is fixed to the top of the inner cylinder, with gaps left at the edges;

[0040] An annular plate is fixed to the top of the inner cylinder and located below the baffle plate, with a circular hole in the center.

[0041] Multiple connecting rods are fixed between the baffle plate and the annular plate, and both the baffle plate and the annular plate gradually bend upward from the center to the edge.

[0042] Preferably, the vortex separation assembly further includes:

[0043] An inclined baffle is fixed to the outer wall of the vortex channel to block the space between the outer walls of the vortex channel.

[0044] A gap is formed between the top of the inclined baffle and the side wall of the vortex channel to allow airflow to pass through;

[0045] Several circular holes are formed between the bottom of the inclined baffle and the side wall of the vortex channel to allow the liquid to flow back.

[0046] Preferably, it further includes:

[0047] Multiple evaporation plates are arranged in a vertical array, with their radius gradually increasing from top to bottom;

[0048] Several guide rods are fixed in a circular array on the side wall of each of the evaporating plates. The bottom of the guide rod on the side wall of the upper evaporating plate is connected to the inside of the guide rod below, and the bottom of the guide rod on the side wall of the bottommost evaporating plate is connected to the bottom of the inner cylinder.

[0049] Several notches are arranged in a circumferential array on the top edge of the evaporation plate, and the top of the guide rod is aligned with the notches;

[0050] Multiple control valves are fixedly installed inside the bottom circular opening of each of the evaporation plates.

[0051] Preferably, it further includes:

[0052] Multiple partition plates are arranged in a circular array and fixed to the bottom of the inner wall of the inner cylinder, with the drain port located at the center of the array of partition plates.

[0053] Preferably, it further includes:

[0054] A booster control pump is connected to the feed inlet via its output terminal;

[0055] A pressure detection unit is installed on the inner wall of the inner cylinder;

[0056] The control unit, installed on the outer cylinder, controls the booster pump to stop delivering pressure when the pressure detection unit detects a pressure deviation set value inside the inner cylinder. At the same time, it controls the vacuum pump to start evacuating the vacuum until the pressure detection unit detects that the pressure inside the inner cylinder has reached the set value. Then, the control unit controls the vacuum pump to shut down and the booster pump to start.

[0057] Compared with the prior art, the present invention has the following beneficial effects:

[0058] By setting up the vortex separation component, the formaldehyde solution flows into the inner circle of the vortex separation component and then flows downwards along the increasing width, thereby increasing the separation effect between the two. The setting of the vortex separation component increases the length of the vortex flow path of the formaldehyde solution, thereby increasing the separation effect. It helps to prevent the liquid flow in the formaldehyde solution from mixing and being discharged after flowing upwards with the airflow, thus improving the separation effect of water. Attached Figure Description

[0059] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0060] Figure 2 This is a schematic diagram of the overall cross-section of the present invention. Figure 1 .

[0061] Figure 3 For the present invention Figure 2 A magnified structural diagram of point A in the middle.

[0062] Figure 4 For the present invention Figure 2 A magnified structural diagram at point B in the middle.

[0063] Figure 5 For the present invention Figure 2 A magnified structural diagram at point C.

[0064] Figure 6 This is a schematic diagram of the overall cross-sectional structure of the present invention. Figure 2 .

[0065] Figure 7 For the present invention Figure 6 A magnified structural diagram at point D.

[0066] Figure 8 For the present invention Figure 6 A magnified structural diagram at point E in the middle.

[0067] In the diagram: 1. Outer cylinder; 101. Inner cylinder; 102. Vacuum pump; 103. Exhaust port; 104. Drain port; 105. Feed port; 106. Connecting pipe; 2. Vortex channel; 201. Liquid outlet; 202. Airflow outlet; 203. Connecting port; 204. Straight pipe end; 3. Steam channel; 301. Baffle plate; 302. First input port; 303. First output port; 304. Second output port; 305. Second input port; 306, vortex guide plate; 4, curved guide tube; 401, opening; 402, insertion interface; 501, inner cavity; 502, connecting opening; 6, baffle plate; 601, annular plate; 602, connecting rod; 7, inclined baffle plate; 701, gap; 702, round hole; 8, evaporation plate; 801, guide rod; 802, control valve; 803, water level detector; 9, partition plate; booster control pump 10. Detailed Implementation

[0068] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0069] like Figures 1 to 8 The formaldehyde production separation device shown includes an outer cylinder 1, and further includes:

[0070] The inner cylinder 101 is fixed inside the outer cylinder 1, forming a temperature control layer between the inner cylinder 1 and the outer cylinder 1;

[0071] Vacuum pump 102 is fixed on the outer wall of outer cylinder 1, and the output shaft of vacuum pump 102 is connected to the inside of inner cylinder 101 through connecting pipe 106.

[0072] The exhaust port 103 is installed on the top of the outer cylinder 1 and is connected to the top of the inner cylinder 101;

[0073] The drain port 104 is installed at the bottom of the outer cylinder 1 and is connected to the bottom of the inner cylinder 101;

[0074] The feed inlet 105 is fixed in the middle of the inner cylinder 101 and is connected to the middle of the inner cylinder 101;

[0075] The vortex separation component is installed inside the inner cylinder 101, with its input end connected to the feed port 105. It is used to guide the formaldehyde solution into the vortex and then separate it by evaporating water under high pressure. The gas-liquid separation is also guided by the gradually increasing width.

[0076] A temperature control unit is installed inside the outer cylinder 1 to control the internal temperature of the outer cylinder 1;

[0077] In the existing technology, when separating formaldehyde during the production process, heating is carried out in a vacuum environment. This causes the water in the formaldehyde aqueous solution to boil and vaporize at low temperature in a near-vacuum environment, thereby separating the water vapor and obtaining a high-concentration formaldehyde solution. However, during the separation process, prolonged exposure can cause formaldehyde gas to escape and be separated along with the steam, or some liquid to flow with the gas flow and be separated, resulting in incomplete separation and affecting the separation efficiency of the device.

[0078] This embodiment of the present invention can solve the above problems. The specific implementation method is as follows: During operation, the operator connects the external high-temperature airflow generating device to the temperature control unit, so that the high-temperature airflow passes through the inside of the temperature control unit to control the temperature of the entire device. The vacuum pump 102 is started to evacuate the inside of the inner cylinder 101, so that after the formaldehyde solution enters the inside of the inner cylinder 101 through the feed port 105, the water in the formaldehyde solution boils and vaporizes at a lower temperature in a near-vacuum environment, thereby separating the water in the formaldehyde solution to increase the concentration of the formaldehyde solution. The vaporized water vapor is discharged through the exhaust port 103, while the formaldehyde solution is discharged from the bottom drain port 104.

[0079] The vortex separation component is configured such that when the feed inlet 105 is tangentially connected to the inner cylinder 101, the formaldehyde solution flows in a vortex shape along the vortex separation component. During the vortex flow, the water in the formaldehyde solution vaporizes in a near-vacuum environment after being heated by the temperature control unit. The vaporized airflow flows along the vortex separation component towards the inner ring. Due to the increased width of the inner ring, the vaporized airflow separates from the formaldehyde solution. The formaldehyde solution flows downwards along the vortex separation component towards the inner ring and then flows downwards along the increased width, thereby increasing the separation effect. The vortex separation component increases the vortex flow path length of the formaldehyde solution, thereby increasing the separation effect and helping to prevent the liquid flow in the formaldehyde solution from mixing and being discharged after flowing upwards with the airflow, thus improving the separation effect of water.

[0080] As an optional embodiment, the vortex separation component includes:

[0081] The vortex channel 2 is fixed at the center of the inner cylinder 101. The vortex channel 2 is vortex-shaped and its vertical width gradually increases from the outer ring to the inner ring.

[0082] Connection port 203 is fixedly connected between the input end of the vortex channel 2 and the feed port 105;

[0083] The straight pipe end 204 is fixedly connected to the center of the inner ring of the vortex channel 2 and is smoothly connected to the vortex channel 2.

[0084] The liquid outlet 201 is located at the bottom of the straight pipe end 204;

[0085] Airflow outlet 202 is located at the top of straight pipe end 204;

[0086] The vortex channel 2 is vortex-shaped, and its vertical width gradually increases towards the inner circle. This allows the formaldehyde solution to gradually flow upward after the water vaporizes and separates into the vortex channel 2, while the solution flows downward, forming a two-way separation during the flow process. This continues until the solution reaches the straight pipe end 204. At this point, the vaporized steam flows upward along the air outlet 202 and is discharged, while the formaldehyde solution flows downward along the liquid outlet 201 to the bottom of the inner cylinder 101, thus separating the two. This helps to avoid the situation where some of the liquid flow is discharged along with the airflow after the formaldehyde solution rotates and flows into the inner cylinder 101, affecting the separation effect.

[0087] As an optional embodiment, the temperature control unit includes:

[0088] Steam passage 3 is located inside the side wall of vortex passage 2;

[0089] The partition 301 is fixed in the middle of the steam channel 3, dividing the steam channel 3 into an upper and lower path, and the upper and lower paths are connected at the inner end;

[0090] The first input port 302 is connected to the upper path of the steam channel 3;

[0091] The first output port 303 is connected to the lower path of the steam channel 3;

[0092] The second output port 304 is fixed to the top of the outer cylinder 1 and is connected to the temperature control layer;

[0093] The second input port 305 is fixed to the bottom of the outer cylinder 1 and is connected to the temperature control layer;

[0094] The vortex guide plate 306 is fixedly installed inside the temperature control layer;

[0095] The high-temperature airflow generated by the external high-temperature airflow generator enters through the first inlet 302 and the second inlet 305. The airflow entering through the first inlet 302 is guided by the vortex guide plate 306, passes through the temperature control layer, and is discharged through the second outlet 304, thereby controlling the temperature inside the temperature control layer and controlling the temperature of the inner cylinder 101 as a whole. The airflow entering through the second inlet 305 flows along the upper path of the steam channel 3, then passes through the lower path of the steam channel 3 and is discharged through the first outlet 303. Thus, when the formaldehyde solution flows along the vortex, it aligns with the vortex channel 2 for heating, thereby forming a uniform heating environment to promote the evaporation and separation of water. This is beneficial for temperature control of the whole device and local areas, and improves the uniformity of temperature control, thereby improving the effect of formaldehyde solution water separation.

[0096] As an optional embodiment, the vortex separation assembly further includes:

[0097] The connector 402 is plugged into the interior of the airflow outlet 202;

[0098] The curved guide tube 4 is fixedly connected to the top of the insertion interface 402;

[0099] Opening 401 is located at the top of the curved guide tube 4;

[0100] The insertion interface 402 drives the curved guide tube 4 to be inserted and installed above the airflow outlet 202. When the evaporated water flows out along the curved guide tube 4, if there is some formaldehyde solution mixed in the airflow, the solution will be able to pass through the curved flow path as it flows along the curved guide tube 4, so that the solution hits the inner wall of the curved guide tube 4 and is separated from the airflow and discharged. This helps to avoid the situation where the solution is mixed in the airflow and causes incomplete separation.

[0101] As an optional embodiment, the vortex separation assembly further includes:

[0102] The inner cavity 501 is formed inside the inner wall of the curved guide tube 4 and the insertion interface 402;

[0103] The connecting opening 502 is formed between the outer wall of the insertion port 402 and the inner wall of the air outlet 202, thus forming a connection between the inner cavity 501 and the steam passage 3.

[0104] The design of the inner cavity 501 and the connecting opening 502 ensures that the airflow temperature is maintained when it enters the curved guide tube 4.

[0105] As an optional embodiment, it also includes:

[0106] The baffle plate 6 is fixed to the top of the inner cylinder 101, with gaps left at the edges;

[0107] The annular plate 601 is fixed to the top of the inner cylinder 101 and located below the baffle plate 6, with a round hole in the center.

[0108] Multiple connecting rods 602 are fixed between the baffle plate 6 and the annular plate 601, and both the baffle plate 6 and the annular plate 601 gradually bend upward from the center to the edge;

[0109] The baffle plate 6 and the annular plate 601 can prevent the airflow from being discharged directly along the exhaust port 103, thereby helping to prevent the airflow from being mixed with solution and affecting the separation effect of water in the formaldehyde solution.

[0110] As an optional embodiment, the vortex separation assembly further includes:

[0111] The inclined baffle 7 is fixed on the outer wall of the vortex channel 2, forming a shield for the space between the outer walls of the vortex channel 2.

[0112] The gap 701 is opened between the top of the inclined baffle 7 and the side wall of the vortex channel 2 to allow airflow to pass through;

[0113] Several circular holes 702 are formed between the bottom of the inclined baffle 7 and the side wall of the vortex channel 2 to allow the liquid to flow back;

[0114] The inclined baffle 7, after the remaining formaldehyde solution flows to the bottom of the inner cylinder 101, further vaporizes and separates the water, then blocks the upward airflow. This causes the airflow to flow upward along the gap 701 under the obstruction of the inclined baffle 7, thus conforming to the vortex channel 2. This further controls the temperature of the solution mixed in the airflow, keeping it within the required range, which is beneficial for promoting the separation of airflow and solution. Furthermore, the circular hole 702 allows the separated solution to flow downward along the circular hole 702 during its fall, further improving the separation effect.

[0115] As an optional embodiment, it also includes:

[0116] Multiple evaporation trays 8 are arranged in a vertical array, with their radius gradually increasing from top to bottom;

[0117] Several guide rods 801 are fixed in a circular array on the side wall of each evaporation plate 8. The bottom of the guide rod 801 on the side wall of the upper evaporation plate 8 is connected to the inside of the lower guide rod 801, and the bottom of the guide rod 801 on the side wall of the bottommost evaporation plate 8 is connected to the bottom of the inner cylinder 101.

[0118] Several notches are arranged in a circular array on the top edge of the evaporation plate 8, and the top of the guide rod 801 is aligned with the notches;

[0119] Multiple control valves 802 are fixedly installed inside the bottom circular opening of each evaporator 8;

[0120] The multi-layer evaporation pans 8 are designed so that the formaldehyde liquid flowing downwards after the initial separation will flow into different evaporation pans 8. This helps to avoid the accumulation of formaldehyde liquid at a deep depth, which would lead to uneven temperature control of the formaldehyde solution inside. The multi-layer evaporation pans 8 are connected by guide rods 801, so that when the formaldehyde solution flows downwards, it flows out along the notch and then flows downwards along the guide rods 801. This allows the solution to flow downwards after the upper evaporation pan 8 is full, and reduces the impact of the liquid flow during the flow process. This helps to prevent the solution from flowing upwards with the vaporized water flow, which would lead to incomplete separation.

[0121] The control valve 802 is designed so that after separation, opening the control valve 802 allows the solution to flow downwards to the bottom of the inner cylinder 101 and be discharged along the drain port 104.

[0122] As an optional embodiment, it also includes:

[0123] Multiple partition plates 9 are arranged in a circular array and fixed to the bottom of the inner wall of the inner cylinder 101, with the drain port 104 located at the center of the array of partition plates 9;

[0124] The partition plate 9 reduces the vortex of the solution as it flows outward along the drain port 104, thereby reducing vortex interference caused by the flow.

[0125] As an optional embodiment, it also includes:

[0126] The booster control pump 10 is connected to the feed inlet 105 through its output end;

[0127] The pressure detection unit is installed on the inner wall of the inner cylinder 101;

[0128] The control unit is installed on the outer cylinder 1. When the pressure detection unit detects the pressure deviation set value inside the inner cylinder 101, the control unit controls the booster control pump 10 to stop delivering and controls the vacuum pump 102 to start evacuating until the pressure detection unit detects that the pressure inside the inner cylinder 101 has reached the set value. Then, the control unit controls the vacuum pump 102 to shut down and the booster control pump 10 to start.

[0129] By coordinating the pressure detection unit and the control unit, the air pressure inside the inner cylinder 101 can be controlled within a set range, which helps to avoid the situation where some formaldehyde solution is discharged with the airflow due to unstable air pressure during the separation process, resulting in incomplete separation.

[0130] Working principle of the invention: During operation, the operator connects the external high-temperature airflow generating device to the temperature control unit, so that the high-temperature airflow passes through the inside of the temperature control unit to control the temperature of the entire device. The vacuum pump 102 is started to evacuate the inside of the inner cylinder 101, so that after the formaldehyde solution enters the inside of the inner cylinder 101 through the feed port 105, the water in the formaldehyde solution boils and vaporizes at a lower temperature in a near-vacuum environment, thereby separating the water in the formaldehyde solution to increase the concentration of the formaldehyde solution. The vaporized water vapor is discharged through the exhaust port 103, while the formaldehyde solution is discharged from the bottom drain port 104.

[0131] The vortex separation component is configured such that when the feed inlet 105 is tangentially connected to the inner cylinder 101, the formaldehyde solution flows in a vortex shape along the vortex separation component. During the vortex flow, the water in the formaldehyde solution vaporizes in a near-vacuum environment after being heated by the temperature control unit. The vaporized airflow flows along the vortex separation component towards the inner ring. Due to the increased width of the inner ring, the vaporized airflow separates from the formaldehyde solution. The formaldehyde solution flows downwards along the vortex separation component towards the inner ring and then flows downwards along the increased width, thereby increasing the separation effect. The vortex separation component increases the vortex flow path length of the formaldehyde solution, thereby increasing the separation effect and helping to prevent the liquid flow in the formaldehyde solution from mixing and being discharged after flowing upwards with the airflow, thus improving the separation effect of water.

[0132] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A separation device for formaldehyde production, comprising an outer cylinder (1), characterized in that, Also includes: The inner cylinder (101) is fixed inside the outer cylinder (1) and forms a temperature control layer between the inner cylinder (1); A vacuum pump (102) is fixed on the outer wall of the outer cylinder (1), and the output shaft of the vacuum pump (102) is connected to the interior of the inner cylinder (101) through a connecting pipe (106); An exhaust port (103) is installed on the top of the outer cylinder (1) and communicates with the top of the inner cylinder (101); The drain port (104) is installed at the bottom of the outer cylinder (1) and is connected to the bottom of the inner cylinder (101); The feed inlet (105) is fixed in the middle of the inner cylinder (101) and communicates with the middle of the inner cylinder (101); The vortex separation component is installed inside the inner cylinder (101), and its input end is connected to the feed port (105). It is used to guide the formaldehyde solution into the vortex and then separate the water by evaporation under high pressure. The gas-liquid separation is guided by the gradually increasing width. A temperature control unit is installed inside the outer cylinder (1) to control the temperature inside the outer cylinder (1).

2. The separation device for formaldehyde production according to claim 1, characterized in that, The vortex separation component includes: The vortex channel (2) is fixed at the center of the inner cylinder (101). The vortex channel (2) is vortex-shaped and its vertical width gradually increases from the outer ring to the inner ring. The connection port (203) is fixedly connected between the input end of the vortex channel (2) and the feed port (105); The straight pipe end (204) is fixedly connected to the center of the inner ring of the vortex channel (2) and is smoothly connected to the vortex channel (2); The liquid outlet (201) is located at the bottom of the straight pipe end (204); An airflow outlet (202) is located at the top of the straight pipe end (204).

3. The separation device for formaldehyde production according to claim 2, characterized in that, The temperature control unit includes: Steam passage (3) is opened inside the side wall of the vortex passage (2); A partition (301) is fixed in the middle of the steam channel (3) to divide the steam channel (3) into an upper and lower path, and the upper and lower paths are connected at the inner end; The first input port (302) is connected to the upper path of the steam channel (3); The first output port (303) is connected to the lower path of the steam channel (3); The second output port (304) is fixed to the top of the outer cylinder (1) and is connected to the temperature control layer; The second input port (305) is fixed to the bottom of the outer cylinder (1) and is connected to the temperature control layer; The vortex guide plate (306) is fixedly installed inside the temperature control layer.

4. The separation device for formaldehyde production according to claim 3, characterized in that, The vortex separation component also includes: The connector (402) is plugged into the interior of the airflow outlet (202); A curved guide tube (4) is fixedly connected to the top of the insertion interface (402); An opening (401) is formed at the top of the curved guide tube (4).

5. A separation device for formaldehyde production according to claim 4, characterized in that, The vortex separation component also includes: The inner cavity (501) is formed inside the inner wall of the curved guide tube (4) and the insertion interface (402); A connecting opening (502) is formed between the outer wall of the insertion port (402) and the inner wall of the airflow outlet (202), thereby forming a connection between the inner cavity (501) and the steam passage (3).

6. A separation device for formaldehyde production according to claim 2, characterized in that, Also includes: A baffle plate (6) is fixed to the top of the inner cylinder (101) with a gap at the edge; An annular plate (601) is fixed to the top of the inner cylinder (101) and located below the baffle plate (6), with a round hole in the center. Multiple connecting rods (602) are fixed between the baffle plate (6) and the annular plate (601), and the baffle plate (6) and the annular plate (601) gradually bend upward from the center to the edge.

7. A separation device for formaldehyde production according to claim 5, characterized in that, The vortex separation component also includes: An inclined baffle (7) is fixed to the outer wall of the vortex channel (2) to block the space between the outer walls of the vortex channel (2); A gap (701) is formed between the top of the inclined baffle (7) and the side wall of the vortex channel (2) to allow airflow to pass through; Several circular holes (702) are provided between the bottom of the inclined baffle (7) and the side wall of the vortex channel (2) to allow the liquid to flow back.

8. A separation device for formaldehyde production according to claim 6, characterized in that, Also includes: Multiple evaporation plates (8) are arranged in a vertical array, with their radii gradually increasing from top to bottom; Several guide rods (801) are fixed in a circular array on the side wall of each of the evaporation plates (8). The bottom of the guide rod (801) on the side wall of the upper evaporation plate (8) is connected to the inside of the guide rod (801) below. The bottom of the guide rod (801) on the side wall of the bottommost evaporation plate (8) is connected to the bottom of the inner cylinder (101). Several notches are arranged in a circular array on the top edge of the evaporation plate (8), and the top of the guide rod (801) is aligned with the notches; Multiple control valves (802) are fixedly installed inside the bottom circular opening of each of the evaporation plates (8).

9. A separation device for formaldehyde production according to claim 8, characterized in that, Also includes: Multiple partition plates (9) are arranged in a circular array and fixed to the bottom of the inner wall of the inner cylinder (101). The drain port (104) is located at the center of the array of partition plates (9).

10. A separation device for formaldehyde production according to claim 9, characterized in that, Also includes: A booster control pump (10) is connected to the feed inlet (105) via its output end. A pressure detection unit is installed on the inner wall of the inner cylinder (101); The control unit is installed on the outer cylinder (1). When the pressure detection unit detects the pressure deviation set value inside the inner cylinder (101), the control unit controls the booster control pump (10) to stop delivering and controls the vacuum pump (102) to start evacuating until the pressure detection unit detects that the pressure inside the inner cylinder (101) reaches the set value. Then, the control unit controls the vacuum pump (102) to shut down and the booster control pump (10) to start.

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