A cooling water recovery and treatment equipment for formaldehyde production

Abstract

The present invention belongs to the field of cooling water recovery and treatment, and specifically relates to a cooling water recovery and treatment device for formaldehyde production. The air intake module of the present invention provides formaldehyde gas and is connected to a liquid guide module. Translation devices are provided on the left and right sides of the air intake module, and the liquid guide module and the heating module are connected through a conveying pipe. The present invention can efficiently collect formaldehyde gas from the liquid, which is achieved by the recycling of two separate test tube-shaped heating devices. The formaldehyde gas in the liquid enters the condensation tank, and is then transported to the separate test tube-shaped heating device through a U-shaped tube, and the active adsorbent absorbs the formaldehyde gas. The device is equipped with a servo motor and a temperature sensor to accurately control the position of the heating device to ensure the efficiency of formaldehyde gas collection. The operation process is simple and intuitive, and the whole process of collecting and treating formaldehyde gas is realized through motor drive and temperature monitoring.

Description

Technical Field

[0001] The invention belongs to the field of cooling water recovery and treatment, and in particular relates to cooling water recovery and treatment equipment for formaldehyde production. Background Art

[0002] Methanol is converted into formaldehyde through oxidation reaction under certain conditions. In this process, the raw materials are first separated by distillation to obtain high-concentration methanol. Oxygen is introduced into the reactor and the methanol is heated and oxidized using a catalyst to generate formaldehyde. The heat of the formaldehyde gas produced by the reaction is cooled by circulating cooling water. The cooled water contains formaldehyde gas. In order to collect the formaldehyde gas dissolved in water, it is urgent to study a cooling water recovery and treatment equipment for formaldehyde production, so that the formaldehyde gas can be fully collected. Summary of the invention

[0003] The object of the present invention is to provide a cooling water recovery and treatment device for formaldehyde production to solve the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A cooling water recovery and treatment device for formaldehyde production includes an air intake module providing formaldehyde gas to connect to a liquid guide module, translation devices are arranged on the left and right sides of the air intake module, and the liquid guide module and a heating module are connected by a conveying pipeline.

[0006] Preferably, the air intake module includes an air intake pipe, one end of which is connected to the condensation tank, and the translation device includes an L-shaped support frame, one end of the L-shaped support frame is fixed to the air intake pipe, and the other end is fixed to a servo motor by means of screws, the lead screw is connected to the servo motor, a retaining stick is at the right end of the servo motor, the retaining stick is inserted into a retaining block and is retractable, the equipment is placed and connected, and formaldehyde gas flows into the condensation tank through the air intake pipe connected to the wall of the condensation tank, at this time, a retaining stick is installed on the L-shaped support frame fixed to the air intake pipe, the retaining stick is inserted into the retaining block and the two are connected and retractable, in order to prevent the detachable test tube-shaped heating device from shaking so that it can move horizontally, a servo motor is installed at one end of the retaining stick and is fixed to the L-shaped support frame by screws, when the servo motor is running, it drives the lead screw to rotate, the lead screw and the fixed block are threadedly connected, thereby driving the detachable test tube-shaped heating device to continuously move away from or approach the air intake pipe.

[0007] Preferably, the liquid guide module includes a condensing tank, which is a circular bottom sealing structure, and the conveying pipeline at the lower left of the condensing tank is connected to the heating module, and the conveying pipeline includes a straight tube and a U-shaped tube, and the U-shaped tube includes a left transverse tube and a right transverse tube, on which there are respectively a left water inlet valve and a right water inlet valve, and a retractable vertical tube, the upper end of the straight tube is connected to the middle of the retractable vertical tube, and the left transverse tube and the right transverse tube are respectively connected to the rear end bottom of the left separation test tube-shaped heating device and the right separation test tube-shaped heating device. The formaldehyde gas dissolved in water is stored at the bottom of the condensing tank, and this mixed liquid flows into the retractable vertical tube in the U-shaped tube through the straight tube, and then is respectively input into the rear end bottom of the left separation test tube-shaped heating device and the right separation test tube-shaped heating device by the left transverse tube and the right transverse tube, so that the active adsorbent can absorb the formaldehyde solution.

[0008] Preferably, the heating module includes a fixed block and a retaining block. The fixed block and the screw rod are connected by threads. The retaining rod is inserted into the retaining block and is retractable. The left pipeline is connected to the front ends of the left separated test-tube-shaped heating device and the right separated test-tube-shaped heating device, and is accompanied by a left drain valve and a right drain valve. The upper exhaust pipe is also accompanied by a left exhaust valve and a right exhaust valve. At this time, the exhaust valve of the upper exhaust pipe is in a closed state. When the servo motor rotates, the left and right separated test-tube-shaped heating devices are away from the air intake pipe due to the threaded connection between the screw rod and the fixed block. The right water inlet valve of the right transverse tube of the U-shaped tube is closed, the left water inlet valve of the left transverse tube of the U-shaped tube is opened, the drain valve at the front end is opened, and the mixed liquid flows into the left separated test-tube-shaped heating device. The temperature sensor's temperature indication is observed to determine whether the active adsorbent has been absorbed.

[0009] Preferably, the left separated test tube-shaped heating device and the right separated test tube-shaped heating device are composed of an arc groove and a shell and a heat conducting plate installed in the arc groove on the outside, and are equipped with uniform heat sinks on the inside, and the heat sinks are fixed on the inner surface of the heat conducting plate. The cavity is filled with active adsorbent, and the temperature sensor is controlled by PLC to ensure the activity of the active adsorbent. When the active adsorbent is completely absorbed, the left water inlet valve of the left transverse tube of the U-shaped tube is closed, and the right water inlet valve of the right transverse tube of the U-shaped tube is opened. At the same time, the left separated test tube-shaped heating device is driven by the servo motor to fit the air intake pipe, and the front is closed. Open the left drain valve of the left pipe at the left end, and observe the temperature of the left separation test-tube shaped heating device under the heat dissipated by the air intake pipe. When the temperature for collecting formaldehyde gas is reached, open the left exhaust valve of the upper exhaust pipe to collect formaldehyde gas. After collecting the formaldehyde gas from the left separation test-tube shaped heating device, the temperature sensor of the right separation test-tube shaped heating device is about to reach the appropriate temperature, so that the active adsorbent is completely absorbed. At this time, the action of the left separation test-tube shaped heating device is repeated, and the left and right separation test-tube shaped heating devices are used alternately in a cycle to better collect the formaldehyde gas dissolved in the liquid.

[0010] Compared with the prior art, the beneficial effects of the present invention are: the recovered cooling water flows through the active adsorbent, and the active adsorbent adsorbs the formaldehyde dissolved in the cooling water, and the left separation test tube-shaped heating device and the right separation test tube-shaped heating device are used alternately and cyclically, which can ensure that one group of the two groups of active adsorbents adsorbs formaldehyde and the other group dries and regenerates the active adsorbents, so that the formaldehyde adsorption operation will not be interrupted and the service life of the active adsorbent is extended. In addition, the heat source for drying the active adsorbent adopts the heat contained in the formaldehyde gas in the air intake pipe to be cooled, which reduces the temperature of the original formaldehyde gas and improves the cooling effect of the formaldehyde gas. There is no need to add heating equipment to dry the active adsorbent, which saves resources and improves the utilization rate of the heat in the original formaldehyde gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 The figure is a schematic diagram of the overall structure of a cooling water recovery and treatment equipment for formaldehyde production.

[0012] Figure 2 This is a schematic diagram of the placement of a heating device for cooling water recovery and treatment equipment for formaldehyde production.

[0013] Figure 3 The present invention is a schematic diagram of the heating structure of a cooling water recovery and treatment equipment for formaldehyde production.

[0014] Figure 4 It is a cross-sectional schematic diagram of a cooling water recovery and treatment equipment for formaldehyde production.

[0015] In the figure: 1. Liquid guide module; 11. Condensation tank; 12. Straight pipe; 13. U-shaped pipe; 131. Left water inlet valve; 132. Right water inlet valve; 133. Left transverse pipe; 134. Right transverse pipe; 135. Vertical pipe; 2. Air intake module; 21. L-shaped support frame; 22. Retaining rod; 23. Screw; 24. Air intake pipe; 25. Servo motor; 26. Screw; 3. Heating module; 31. Fixing block; 32. Left pipe; 321. Left drain valve; 322, right drain valve; 33, upper exhaust pipe; 331, left exhaust valve; 332, right exhaust valve; 34, left separated test tube-shaped heating device; 341, heat conducting plate; 342, arc groove; 343, active adsorbent; 344, temperature sensor; 345, cavity; 346, heat sink; 347, shell; 35, right separated test tube-shaped heating device; 36, retaining block; 4, translation device; 5, delivery pipeline. DETAILED DESCRIPTION

[0016] Example 1

[0017] See also Figure 1-Figure 4As shown, a cooling water recovery and treatment device for formaldehyde production includes an air intake module 2 for providing formaldehyde gas, the air intake module 2 is connected to a liquid guide module 1, a translation device 4 is provided on the left and right sides of the air intake module 2, and the liquid guide module 1 and the heating module 3 are connected by a conveying pipe 5.

[0018] refer to Figure 1-Figure 4 As shown, the air intake module 2 includes an air intake pipe 24, one end of which is connected to the condensation tank 11, and the translation device 4 includes an L-shaped support frame 21, one end of the L-shaped support frame 21 is fixed to the air intake pipe 24, and the other end is fixed to the servo motor 25 by a screw 26, the screw rod 23 is connected to the servo motor 25, and the holding stick 22 is at the right end of the servo motor 25. The holding stick 22 is inserted into the holding block 36 and is retractable. The equipment is placed and connected, and the formaldehyde gas flows into the condensation tank 11 through the air intake pipe 24 connected to the wall of the condensation tank 11. At this time, a retaining rod 22 is installed on the L-shaped support frame 21 fixed to the air intake duct 24. The retaining rod 22 is inserted into the retaining block 36 and the two are connected and retractable. In order to prevent the separation tube-shaped heating device from shaking and enable it to move horizontally, a servo motor 25 is installed at one end of the retaining rod 22 and is fixed to the L-shaped support frame 21 by a screw 26. When the servo motor 25 is running, it drives the screw rod 23 to rotate, and the screw rod 23 and the fixing block 31 are threadedly connected, thereby driving the separation tube-shaped heating device to continuously move away from or approach the air intake duct 24.

[0019] refer to Figure 1-Figure 4 As shown, the liquid guiding module 1 includes a condensing tank 11, which is a circular bottom sealing structure. The conveying pipeline 5 at the lower left of the condensing tank 11 is connected to the heating module 3. The conveying pipeline 5 includes a straight pipe 12 and a U-shaped pipe 13. The U-shaped pipe 13 includes a left transverse pipe 133 and a right transverse pipe 134, on which there are respectively a left water inlet valve 131 and a right water inlet valve 132, and a retractable vertical pipe 135. The upper end of the straight pipe 12 is connected to the middle part of the retractable vertical pipe 135, and the left transverse pipe 133 and the right transverse pipe 134 are respectively connected to the rear end bottom of the left separation tube-shaped heating device 34 and the right separation tube-shaped heating device 35. The formaldehyde gas dissolved in water is stored at the bottom of the condensation tank 11. The mixed liquid flows into the retractable vertical pipe 135 in the U-shaped tube 13 through the straight pipe 12, and then is input into the bottom of the rear end of the left separation tube-shaped heating device 34 and the right separation tube-shaped heating device 35 through the left transverse pipe 133 and the right transverse pipe 134 respectively, so that the active adsorbent 343 can absorb the formaldehyde solution.

[0020] refer to Figure 1-Figure 4As shown, the heating module 3 includes a fixed block 31 and a holding block 36. The fixed block 31 and the screw rod 23 are connected by threads. The holding rod 22 is inserted into the holding block 36 and is retractable. The left pipe 32 is connected to the front ends of the left separated test tube-shaped heating device 34 and the right separated test tube-shaped heating device 35, and is accompanied by a left drain valve 321 and a right drain valve 322. The upper exhaust pipe 33 is also accompanied by a left exhaust valve 331 and a right exhaust valve 332. At this time, the exhaust valve of the upper exhaust pipe 33 is in a closed state. When the servo motor 25 rotates, the left and right separated test tube-shaped heating devices are threadedly connected to the fixed block 31 and thus move away from the intake pipe 24. The right water inlet valve 132 of the right transverse tube 134 of the U-shaped tube 13 is closed, the left water inlet valve 131 of the left transverse tube 133 of the U-shaped tube 13 is opened, and the front end drain valve is opened. The mixed liquid flows into the left separated test tube-shaped heating device 34. The temperature sensor 344 is observed to indicate that the active adsorbent 343 has been completely absorbed.

[0021] refer to Figure 1-Figure 4 As shown, the left separated test tube heating device 34 and the right separated test tube heating device 35 are composed of an arc groove 342 and a shell 347 and a heat conducting sheet 341 installed in the arc groove 342. A uniform heat sink 346 is installed inside. The heat sink 346 is fixed on the inner surface of the heat conducting sheet 341. The cavity 345 is filled with an active adsorbent 343. The temperature sensor 344 is controlled by a PLC to ensure the activity of the active adsorbent 343. When the active adsorbent 343 is completely absorbed, the left water inlet valve 131 of the left transverse tube 133 of the U-shaped tube 13 is closed, and the right water inlet valve 132 of the right transverse tube 134 of the U-shaped tube 13 is opened. At the same time, the left separated test tube heating device 34 is turned on by the servo motor 2 5 is driven to fit the air intake pipe 24, close the left drain valve 321 of the front left pipe 32, and observe the temperature of the left separation test tube-shaped heating device 34 under the heat emitted by the air intake pipe 24. When the temperature for collecting formaldehyde gas is reached, open the left exhaust valve 331 of the upper exhaust pipe 33 to collect formaldehyde gas. After collecting the formaldehyde gas from the left separation test tube-shaped heating device 34, the temperature sensor 344 of the right separation test tube-shaped heating device 35 is about to reach a suitable temperature, so that the active adsorbent 343 has completed absorption. At this time, the action of the left separation test tube-shaped heating device 34 is repeated, and the left and right separation test tube-shaped heating devices are used alternately in a cycle to better collect the formaldehyde gas dissolved in the liquid.

[0022] Working principle: Place and connect the equipment, and the formaldehyde gas flows into the condensation tank 11 through the air intake pipe 24 connected to the wall of the condensation tank 11. At this time, a retaining stick 22 is installed on the L-shaped support frame 21 fixed to the air intake pipe 24. The retaining stick 22 is inserted into the retaining block 36 and the two are connected and retractable. In order to prevent the separation tube-shaped heating device from shaking and enable it to move horizontally, a servo motor 25 is installed at one end of the retaining stick 22 and fixed to the L-shaped support frame 21 by a screw 26. When the servo motor 25 is running, it drives the screw rod 23 to rotate, and the screw rod 23 and the fixed block 31 are threadedly connected, thereby driving the detachable tube-shaped heating device to continuously move away from or approach the air intake pipe 24. The left transverse tube 133 and the right transverse tube 134 are respectively connected to the rear end bottoms of the left separation tube-shaped heating device 34 and the right separation tube-shaped heating device 35. The formaldehyde gas dissolved in water is stored at the bottom of the condensation tank 11, and the mixed liquid flows into the retractable vertical pipe 135 in the U-shaped tube 13 through the straight tube 12, and then is respectively input into the rear end bottom of the left separation test tube-shaped heating device 34 and the right separation test tube-shaped heating device 35 through the left transverse tube 133 and the right transverse tube 134, so that the active adsorbent 343 can absorb the formaldehyde solution. At this time, the exhaust valve of the upper exhaust pipe 33 is in a closed state, and the left and right separation test tube-shaped heating devices are rotated by the servo motor 25. Due to the threaded connection between the screw rod 23 and the fixing block 31, they are away from the intake pipe 24, the right water inlet valve 132 of the right transverse tube 134 of the U-shaped tube 13 is closed, the left water inlet valve 131 of the left transverse tube 133 of the U-shaped tube 13 is opened, the front end drain valve is opened, and the mixed liquid flows into the left separation test tube-shaped heating device 34, and the degree prompt of the temperature sensor 344 is observed to judge that the active adsorbent 343 has been absorbed. When the active adsorbent 34 When the absorption is completed, the left water inlet valve 131 of the left transverse pipe 133 of the U-shaped tube 13 is closed, and the right water inlet valve 132 of the right transverse pipe 134 of the U-shaped tube 13 is opened. At the same time, the left separation test tube-shaped heating device 34 is attached to the air intake pipe 24 under the drive of the servo motor 25, and the left drain valve 321 of the front left pipe 32 is closed. Under the heat emitted by the air intake pipe 24, the temperature of the left separation test tube-shaped heating device 34 is observed. When the temperature for collecting the formaldehyde gas is reached, the left exhaust valve 331 of the upper exhaust pipe 33 is opened to collect the formaldehyde gas. After the collection of the formaldehyde gas of the left separation test tube-shaped heating device 34 is completed, the temperature sensor 344 of the right separation test tube-shaped heating device 35 is about to reach a suitable temperature, so that the active adsorbent 343 is completely absorbed. At this time, the action of the left separation test tube-shaped heating device 34 is repeated, and the left and right separation test tube-shaped heating devices are used alternately in a cycle to better collect the formaldehyde gas dissolved in the liquid.

Claims

1. A cooling water recovery and treatment equipment for formaldehyde production, characterized in that: The air intake module (2) provides formaldehyde gas and is connected to the liquid guide module (1). The air intake module (2) is provided with translation devices (4) on both sides. The liquid guide module (1) and the heating module (3) are connected via a delivery pipe (5). The air intake module (2) includes an air intake pipe (24). One end of the air intake pipe (24) is connected to the condensation tank (11). The translation device (4) includes an L-shaped support frame (21). One end of the L-shaped support frame (21) is fixed to the air intake pipe (24). The other end of the L-shaped support frame (21) is fixed to the servo motor (25) by means of screws (26). The screw rod (23) is connected to the servo motor (25), the retaining rod (22) is at the right end of the servo motor (25), and the retaining rod (22) is inserted into the retaining block (36) and is retractable; The heating module (3) comprises a fixing block (31) and a retaining block (36); the fixing block (31) and the screw rod (23) are connected by threads; the retaining rod (22) is inserted into the retaining block (36) and is retractable; the left pipe (32) is connected to the front ends of the left separated test tube-shaped heating device (34) and the right separated test tube-shaped heating device (35), and is provided with a left drainage valve (321) and a right drainage valve (322); the upper exhaust pipe (33) is also provided with a left exhaust valve (331) and a right exhaust valve (332); The left separated test tube-shaped heating device (34) and the right separated test tube-shaped heating device (35) are externally composed of an arc groove (342) and a shell (347) and a heat conducting sheet (341) installed in the arc groove (342), and are internally provided with uniform heat sinks (346), the heat sinks (346) being fixed on the inner surface of the heat conducting sheet (341), the cavity (345) being filled with an active adsorbent (343), and the temperature sensor (344) being controlled by a PLC to ensure the activity of the active adsorbent (343); The liquid guide module (1) comprises a condensation tank (11), wherein the condensation tank (11) is a circular bottom-sealed structure, and a delivery pipeline (5) at the lower left of the condensation tank (11) is connected to the heating module (3), and the delivery pipeline (5) comprises a straight pipe (12) combined with a U-shaped pipe (13); The U-shaped tube (13) comprises a left transverse tube (133) and a right transverse tube (134), on which a left water inlet valve (131) and a right water inlet valve (132) are respectively arranged, as well as a retractable vertical tube (135), and the upper end of the straight tube (12) is connected to the middle of the retractable vertical tube (135); The left transverse tube (133) and the right transverse tube (134) are respectively connected to the rear end bottoms of the left separation test tube-shaped heating device (34) and the right separation test tube-shaped heating device (35); A servo motor (25) is mounted on one end of the distance keeping rod (22) and is fixed to the L-shaped support frame (21) by means of a screw (26). When the servo motor (25) is in operation, it drives the screw rod (23) to rotate. The screw rod (23) and the fixing block (31) are threadedly connected, thereby driving the separation test tube-shaped heating device to continuously move away from or approach the air inlet pipe (24).

Images