Waste heat recovery device of formaldehyde production reactor

Abstract

The utility model discloses a waste heat recovery device for a formaldehyde production reactor, which relates to the technical field of formaldehyde production and comprises a tank body and a condensation tank, an air outlet pipe is fixedly communicated between the tank body and the condensation tank, a heat insulation box is mounted on one side of the tank body, and a heat insulation layer is coated on the outer side of the heat insulation box. And a smoke inlet pipe is fixedly communicated between the heat insulation box and the condensation tank, one side of the heat insulation box is fixedly communicated with a smoke exhaust pipe, and one side of the tank body is fixedly communicated with two air inlet pipes. According to the formaldehyde production reactor, the heat insulation box is arranged, methanol and reaction gas entering the tank body are heated in advance through the heat insulation box, so that the heating effect of the formaldehyde production reactor is improved, and the energy consumption of the formaldehyde production reactor is reduced, waste gas is recycled through the heat insulation box, and heat carried by the waste gas exchanges heat with the methanol and the reaction gas; therefore, the waste heat recovery effect of the formaldehyde production reactor is improved, and meanwhile heat loss in the formaldehyde production reactor is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to formaldehyde production technical field, concretely is formaldehyde production reactor waste heat recovery device. BACKGROUND

[0002] Formaldehyde is a naturally occurring organic compound, formaldehyde is the important precursor of many other materials and compounds. Formaldehyde is mainly used for the production of industrial resin, such as shaving board and coating manufacturing;The current formaldehyde production process is the electrolytic silver method for preparing formaldehyde process, the principle is that methanol and oxygen in air occur catalysis on silver catalyst to generate formaldehyde.

[0003] After a large number of searches, it is found that: China utility model patent column: the publication number CN221245211U discloses a formaldehyde production device with heat recycling mechanism, including formaldehyde production tank, exhaust pipe and filter sleeve;The bottom end of the formaldehyde production tank is provided with support leg, the inside of the formaldehyde production tank is provided with heater, the rear end in the formaldehyde production tank is provided with temperature monitoring module;The middle position in the formaldehyde production tank is provided with stirring structure.

[0004] In the above scheme, although there are many benefits, but the device through the backflow of waste gas can cause the heat loss of formaldehyde production tank, thereby affecting the production efficiency of formaldehyde production tank;Among them, the internal temperature of formaldehyde production tank is higher than the temperature of waste gas flowing in the circulating cavity due to the heater, through the heat exchange mode, not only can not effectively absorb the heat of waste gas, but also can cause the heat in the tank cavity of formaldehyde production tank to be taken away by waste gas and lost, thus reducing the heating efficiency of formaldehyde production reactor, and at the same time increasing the heating energy consumption of formaldehyde production reactor. UTILITY MODEL CONTENT

[0005] The utility model aims at providing formaldehyde production reactor waste heat recovery device to solve the problem of poor effect of the current formaldehyde production reactor waste heat recovery device in the prior art.

[0006] In order to achieve the above object, the utility model provides the following technical scheme: formaldehyde production reactor waste heat recovery device, including tank body and condensing tank, the tank body and condensing tank are fixedly connected with the gas outlet pipe, the tank body one side is installed with the heat insulation box, the heat insulation box's outside is coated with the heat insulation layer, the heat insulation box and condensing tank are fixedly connected with the smoke inlet pipe, and the heat insulation box one side is fixedly connected with the exhaust pipe, the tank body one side is fixedly connected with two air inlet pipes, the movable end of two air inlet pipes is all from heat insulation box one side and penetrates to heat insulation box other side, the gas outlet pipe, smoke inlet pipe and air inlet pipe all are provided with the electromagnetic valve of control exhaust.

[0007] Preferably, the air inlet pipe comprises a connecting pipe and a heat exchange pipe fixedly connected with each other, the heat exchange pipe is arranged in an S-shaped coil inside a heat insulation box, the air inlet pipe comprises end portions with two end ports, a bending portion and a straight portion, the bending portion and the straight portion form an S-shaped coil shape, the heat exchange pipe comprises the bending portion and the straight portion, the heat insulation box is fixedly connected with two vertical partition plates, the two vertical partition plates are fixedly sleeved outside the heat exchange pipe, and the straight portion of the heat exchange pipe is located between the two vertical partition plates.

[0008] Preferably, one side of each of the two vertical partition plates is fixedly connected with linearly arrayed transverse partition plates, the two groups of transverse partition plates are arranged in a staggered mode, the straight portion of each heat exchange pipe is located between each adjacent two transverse partition plates, the vertical partition plates and the transverse partition plates are arranged in perpendicular modes, and the transverse partition plates divide the condensate tank into S-shaped cavities.

[0009] Preferably, the straight portion of the heat exchange pipe is rotatably sleeved with two sleeve rings, a scraping rod is fixedly connected between the two sleeve rings, an outer gear ring is fixedly sleeved outside the sleeve ring, linearly arrayed straight gears are rotatably connected to one side of the vertical partition plate, each outer gear ring is rotatably connected with each straight gear in a meshed mode, and the scraping rod is in contact with the straight portion of the heat exchange pipe.

[0010] Preferably, one side of each straight gear is fixedly connected with a shaft rod rotatably connected in a shaft hole formed in one side of the vertical partition plate, a rotating rod is rotatably connected to an inner wall of the heat insulation box, the rotating rod is provided with a linkage group at a position corresponding to each straight gear, the linkage group comprises two bevel gears rotatably connected with each other, the two bevel gears are arranged in perpendicular modes, the bevel gears and the rotating rod are located outside the two vertical partition plates, the two bevel gears are fixedly sleeved outside the rotating rod and the shaft rod.

[0011] Preferably, a servo motor is mounted on an upper portion of the heat insulation box, a movable end of the servo motor is rotatably connected with a top end of the rotating rod, the servo motor is electrically connected with a power supply, the servo motor used in the application is a purchased component, the selection of the component is based on the requirements of power and size, a control switch system of the servo motor adopts a module provided by a corresponding vendor, and thus no more details are given herein.

[0012] Preferably, an outer side of the tank body is coated with a heat insulation layer.

[0013] Compared with the prior art, the application has the following beneficial effects:

[0014] 1. This application improves the heating effect and reduces the energy consumption of the formaldehyde production reactor by setting up an insulation box to preheat the methanol and reaction gases entering the tank. In particular, the insulation box recovers the waste gas and uses the heat carried by the waste gas to exchange heat with the methanol and reaction gases, thereby improving the waste heat recovery effect of the formaldehyde production reactor and preventing heat loss inside the formaldehyde production reactor.

[0015] 2. This application increases the time for methanol and reaction gases to exchange heat with the waste gas simultaneously by setting up horizontal partitions, thereby further improving the waste heat recovery efficiency and effect of the formaldehyde production reactor.

[0016] 3. This application uses a scraper and collar to clean the solid matter generated by exhaust gas on the surface of the heat exchange tube, thereby improving the heat exchange efficiency and extending the heat exchange time. At the same time, it prevents the corrosive substances generated by the exhaust gas from corroding the surface of the heat exchange tube, thus extending the service life of the heat exchange tube. Attached Figure Description

[0017] Figure 1 This is a three-dimensional schematic diagram of the waste heat recovery device of the formaldehyde production reactor of this utility model;

[0018] Figure 2 This is a three-dimensional schematic diagram of the assembly of the air inlet pipe, spur gear, and scraper of the waste heat recovery device for the formaldehyde production reactor of this utility model.

[0019] Figure 3 This is a three-dimensional cross-sectional view of the heat insulation box of the waste heat recovery device for the formaldehyde production reactor of this utility model;

[0020] Figure 4 This is a schematic diagram of the cross-sectional structure of the heat insulation box of the waste heat recovery device for the formaldehyde production reactor of this utility model;

[0021] Figure 5 This is a three-dimensional schematic diagram of the air inlet pipe of the waste heat recovery device for the formaldehyde production reactor of this utility model.

[0022] The following are the labels in the diagram: 1. Tank body; 2. Condensate tank; 3. Gas outlet pipe; 4. Gas inlet pipe; 401. Connecting pipe; 402. Heat exchange pipe; 5. Horizontal partition plate; 6. Insulation box; 7. Smoke inlet pipe; 8. Smoke exhaust pipe; 9. Collar ring; 10. Scraper rod; 11. External gear ring; 12. Spur gear; 13. Rotating rod; 14. Bevel gear; 15. Servo motor; 16. Vertical partition plate. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Example: Figure 1 - Figure 5 As shown, this utility model provides a technical solution for a waste heat recovery device for a formaldehyde production reactor, including a tank 1 and a condenser tank 2. An exhaust pipe 3 is fixedly connected between the tank 1 and the condenser tank 2. A heat insulation box 6 is installed on one side of the tank 1. The outer side of the heat insulation box 6 is coated with a heat insulation layer. An inlet pipe 7 is fixedly connected between the heat insulation box 6 and the condenser tank 2. An exhaust pipe 8 is fixedly connected to one side of the heat insulation box 6. Two air inlet pipes 4 are fixedly connected to one side of the tank 1. The movable ends of the two air inlet pipes 4 pass through one side of the heat insulation box 6 to the other side of the heat insulation box 6. Solenoid valves for controlling exhaust are installed on the exhaust pipe 3, the inlet pipe 7, and the air inlet pipe 4.

[0025] Methanol and reactant gases enter tank 1 through inlet pipe 4 to react and produce formaldehyde gas. The formaldehyde gas produced enters condenser 2 through outlet pipe 3. The formaldehyde gas is then cooled by the cooling system in condenser 2. The cooled formaldehyde liquid is discharged through the outlet in condenser 2. The generated waste gas enters heat insulation box 6 through smoke inlet pipe 7 and exchanges heat with inlet pipe 4 in heat insulation box 6. After that, the waste gas is discharged through exhaust pipe 8. In this way, methanol and reactant gases are heated before entering tank 1.

[0026] The specific structures of tank 1, condenser 2, gas outlet pipe 3 and liquid outlet, as well as the connection methods and usage methods of the relevant structures, are all existing technologies. For a detailed description, please refer to the formaldehyde production device with a heat recycling mechanism disclosed in publication number CN221245211U. This application will not elaborate further.

[0027] like Figure 5 As shown, the intake pipe 4 includes a connecting pipe 401 and a heat exchange pipe 402 that are fixedly connected to each other. The heat exchange pipe 402 is arranged in an S-shape inside the heat insulation box 6. The intake pipe 4 includes end portions at both ends, a bent portion, and a straight portion. The bent portion and the straight portion form an S-shaped spiral shape. The heat exchange pipe 402 includes a bent portion and a straight portion. Two vertical partition plates 16 are fixedly connected inside the heat insulation box 6. Both vertical partition plates 16 are fixedly sleeved on the outside of the heat exchange pipe 402. The straight portion of the heat exchange pipe 402 is located between the two vertical partition plates 16.

[0028] The vertical partition 16 separates the curved and straight sections of the intake pipe 4 to prevent exhaust gas from coming into contact with the curved section of the intake pipe 4 and becoming impossible to clean.

[0029] like Figure 3 and Figure 4 As shown, two vertical partition plates 16 are fixedly connected to a linear array of horizontal partition plates 5 on one side facing each other. The two sets of horizontal partition plates 5 are staggered, and the straight part of each heat exchange tube 402 is located between each two adjacent horizontal partition plates 5. The vertical partition plates 16 and the horizontal partition plates 5 are set perpendicular to each other. The horizontal partition plates 5 divide the interior of the condenser tank 2 into an S-shaped cavity.

[0030] The transverse partition plate 5 increases the flow time and residence time of the exhaust gas in the heat insulation box 6, thereby improving the heat exchange efficiency between the exhaust gas and the inlet pipe 4 and improving the efficiency of the waste heat recovery device of the formaldehyde production reactor in recovering heat from the exhaust gas.

[0031] like Figure 2 and Figure 4 As shown, two collars 9 are rotatably fitted on the straight section of the heat exchange tube 402, and a scraper 10 is fixedly connected between the two collars 9. An external toothed ring 11 is fixedly fitted on the outside of the collars 9. A linear array of spur gears 12 is rotatably connected to one side of the vertical partition plate 16. Each external toothed ring 11 meshes with each spur gear 12. The scraper 10 is in contact with the straight section of the heat exchange tube 402.

[0032] By rotating the collar 9, the collar 9 uses the scraper 10 to scrape off the waste gas deposits adhering to the surface of the heat exchange tube 402.

[0033] like Figure 2 and Figure 3 As shown, a shaft is fixedly connected to one side of the spur gear 12, and the shaft is rotatably connected to a shaft hole opened on one side of the vertical partition plate 16. A rotating rod 13 is rotatably connected to the inner wall of the heat insulation box 6. A linkage group is set at the corresponding position of each spur gear 12 on the rotating rod 13. The linkage group includes two bevel gears 14 that mesh with each other. The two bevel gears 14 are arranged perpendicular to each other, and both the bevel gears 14 and the rotating rod 13 are located on the outer side between the two vertical partition plates 16. The two bevel gears 14 are respectively fixedly sleeved on the outer side of the rotating rod 13 and the outer side of the shaft.

[0034] By rotating the rotating rod 13, the rotating rod 13 drives the spur gears 12 to rotate together through the bevel gears 14. The spur gears 12 drive the external gear rings 11 to rotate, and the external gear rings 11 drive the collar 9 to rotate.

[0035] like Figure 2 and Figure 4As shown, a servo motor 15 is installed on the upper part of the heat insulation box 6. The movable end of the servo motor 15 is rotatably connected to the top of the rotating rod 13, and the servo motor 15 is electrically connected to the power supply. The servo motor 15 used in this application is a purchased part, which is selected according to the power and size requirements. The system for controlling the switch adopts the module provided by the corresponding vendor. This application will not elaborate further.

[0036] The servo motor 15 drives the rotating rod 13 to rotate.

[0037] like Figure 1 As shown, the outer side of tank 1 is coated with a heat insulation layer;

[0038] The insulation layer can increase the insulation effect of the tank 1, thereby preventing heat loss from the inside of the tank 1 and improving the heating efficiency inside the tank 1.

[0039] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A waste heat recovery device for a formaldehyde production reactor, comprising a tank (1) and a condenser (2), wherein an outlet pipe (3) is fixedly connected between the tank (1) and the condenser (2), characterized in that: A heat insulation box (6) is installed on one side of the tank (1). A flue gas inlet pipe (7) is fixedly connected between the heat insulation box (6) and the condenser (2). A flue gas outlet pipe (8) is fixedly connected to one side of the heat insulation box (6). Two air inlet pipes (4) are fixedly connected to one side of the tank (1). The movable ends of the two air inlet pipes (4) pass through one side of the heat insulation box (6) to the other side of the heat insulation box (6).

2. The waste heat recovery device for formaldehyde production reactor according to claim 1, characterized in that: The air inlet pipe (4) includes a connecting pipe (401) and a heat exchange pipe (402) that are fixedly connected to each other. The heat exchange pipe (402) is arranged in an S-shaped spiral inside the heat insulation box (6). Two vertical partition plates (16) are fixedly connected inside the heat insulation box (6). Both vertical partition plates (16) are fixedly sleeved on the outside of the heat exchange pipe (402). The straight part of the heat exchange pipe (402) is located between the two vertical partition plates (16).

3. The waste heat recovery device for formaldehyde production reactor according to claim 2, characterized in that: Each of the two vertical partition plates (16) is fixedly connected to a linear array of horizontal partition plates (5) on one side facing each other. The two sets of horizontal partition plates (5) are staggered, and the straight part of each heat exchange tube (402) is located between each two adjacent horizontal partition plates (5).

4. The waste heat recovery device for formaldehyde production reactor according to claim 3, characterized in that: Two collars (9) are rotatably fitted on the straight section of the heat exchange tube (402), and a scraper (10) is fixedly connected between the two collars (9). An external toothed ring (11) is fixedly fitted on the outer side of the collar (9). A linear array of spur gears (12) is rotatably connected to one side of the vertical partition plate (16), and each external toothed ring (11) meshes with each spur gear (12).

5. The waste heat recovery device for formaldehyde production reactor according to claim 4, characterized in that: A shaft is fixedly connected to one side of the spur gear (12), and the shaft is rotatably connected to a shaft hole opened on one side of the vertical partition plate (16). A rotating rod (13) is rotatably connected to the inner wall of the heat insulation box (6). A linkage group is provided at the corresponding position of each spur gear (12) on the rotating rod (13). The linkage group includes two bevel gears (14) that mesh with each other. The two bevel gears (14) are respectively fixedly sleeved on the outside of the rotating rod (13) and the outside of the shaft.

6. The waste heat recovery device for formaldehyde production reactor according to claim 1, characterized in that: A servo motor (15) is installed on the upper part of the heat insulation box (6), and the movable end of the servo motor (15) is rotatably connected to the top of the rotating rod (13).

7. The waste heat recovery device for formaldehyde production reactor according to claim 1, characterized in that: The outer side of the tank (1) is coated with a heat insulation layer.

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