Evaporator for formaldehyde production
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ANHUI HEHONG CHEM CO LTD
- Filing Date
- 2025-07-29
- Publication Date
- 2026-06-26
AI Technical Summary
In the current formaldehyde production process, adding solution to the evaporation kettle causes a drop in temperature, affecting evaporation efficiency and production costs.
Design an evaporator for formaldehyde production. The hot gas discharged from the evaporator is introduced into the storage tank through the exhaust pipe to preheat the solution. Combined with a liquid level monitoring component and a stirring rod, the heat exchange efficiency is improved and the solution temperature is kept stable.
The initial temperature of the solution in the evaporation vessel was increased, which enhanced the evaporation efficiency of formaldehyde and reduced production costs.
Smart Images
Figure CN224404376U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of evaporators, and in particular to an evaporator for formaldehyde production. Background Technology
[0002] In the formaldehyde production process, the evaporator is a key piece of equipment, mainly used to heat methanol and evaporate it into formaldehyde gas. In recent years, the technology of evaporators for formaldehyde production has been continuously developed, and a variety of new designs have emerged to improve production efficiency and reduce energy consumption.
[0003] In the existing technology, formaldehyde evaporation requires the continuous replenishment of new evaporation solution into the evaporation vessel to prevent it from drying out and being damaged. However, the newly added solution will inevitably cause the temperature inside the evaporation vessel to drop, thereby slowing down the evaporation efficiency of formaldehyde, reducing the production efficiency of formaldehyde, and thus increasing the production cost of formaldehyde. Utility Model Content
[0004] The above-mentioned technical objective of this utility model is achieved through the following technical solution:
[0005] An evaporator for formaldehyde production, comprising:
[0006] The base is used to provide support;
[0007] An evaporator, mounted on the top side of a base, is used to produce formaldehyde;
[0008] The liquid storage tank is located on the top of the base on the other side. The liquid storage tank is connected to the evaporation kettle through a connecting pipe and is used to replenish the evaporation solution in the evaporation kettle. The side wall of the liquid storage tank is connected to the liquid inlet pipe, and both the liquid inlet pipe and the connecting pipe are equipped with water pumps for pumping water.
[0009] An exhaust assembly, installed on the evaporator and the storage tank, is used to remove formaldehyde. The exhaust assembly includes an exhaust pipe 1 and an exhaust pipe 2. The exhaust pipe 1 is fixedly connected to the top of the evaporator. The end of the exhaust pipe 1 away from the evaporator extends into the storage tank from the top and extends out of the storage tank from the bottom. The exhaust pipe 2 is fixedly connected to the top of the storage tank.
[0010] There are two liquid level monitoring components, one located at the top of the evaporator and the other at the bottom of the storage tank.
[0011] Furthermore, the portion of the exhaust pipe located inside the liquid storage tank is spirally bent to form a spiral segment, and the spiral segment is provided with multiple protrusions spaced apart along its length to make the spiral segment resemble a corrugated pipe.
[0012] Furthermore, a sleeve is vertically and fixedly connected to one end of the exhaust pipe that extends into the liquid storage tank, and a one-way valve is fixedly connected to the bottom of the sleeve.
[0013] Furthermore, the liquid level monitoring component includes a slide rod, a slider, and a pressure switch. The slide rod is fixedly connected to the bottom of the liquid storage tank, and pressure switches are connected to both the top and bottom of the slide rod. A slider for abutting the pressure switch is slidably connected to the outer wall of the slide rod.
[0014] Furthermore, a float is fixedly connected to the outer wall of the slider, and the float has a hollow cavity inside to reduce weight.
[0015] Furthermore, an electric heating block for evaporating the solution is fixedly connected to the inner wall of the evaporator, and a stirring rod for stirring the solution is rotatably installed on the top of the evaporator.
[0016] In summary, this utility model has at least one of the following beneficial technical effects:
[0017] This evaporator for formaldehyde production, through its exhaust assembly, allows the newly evaporated, heated gas to be introduced into a storage tank to preheat the solution inside. This increases the initial temperature of the solution added to the evaporator, reduces the temperature drop in the evaporator, improves the evaporation efficiency of formaldehyde, and lowers the production cost of formaldehyde. Attached Figure Description
[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0019] Figure 1 This is a schematic diagram of the structure of an evaporator for formaldehyde production according to this utility model.
[0020] Figure 2 This is a schematic diagram of the internal structure of the liquid storage tank in an evaporator for formaldehyde production according to this utility model.
[0021] Figure 3 This is a schematic diagram of the liquid level monitoring component in an evaporator for formaldehyde production according to the present invention.
[0022] Figure 4 This is a schematic diagram of the evaporation kettle in an evaporator for formaldehyde production according to this utility model.
[0023] In the diagram, 1. Base; 2. Evaporator; 3. Storage tank; 4. Exhaust assembly; 41. Exhaust pipe one; 42. Exhaust pipe two; 5. Liquid level monitoring assembly; 51. Slide rod; 52. Slider; 53. Pressure switch; 6. Connecting pipe; 7. Inlet pipe; 8. Water pump; 9. Spiral section; 10. Sleeve; 11. Check valve; 12. Float; 13. Cavity; 14. Heating block; 15. Stirring rod. Detailed Implementation
[0024] The present invention will be further described in detail below with reference to the accompanying drawings. Example
[0025] Reference Figures 1-4 This utility model discloses an evaporator for formaldehyde production, comprising:
[0026] Base 1, used to provide support;
[0027] Evaporation kettle 2, which is installed on the top side of the base 1, is used to produce formaldehyde;
[0028] The liquid storage tank 3 is located on the other side of the top of the base 1. The liquid storage tank 3 is connected to the evaporation kettle 2 through the connecting pipe 6 and is used to replenish the evaporation solution of the evaporation kettle 2. The side wall of the liquid storage tank 3 is connected to the liquid inlet pipe 7. Both the liquid inlet pipe 7 and the connecting pipe 6 are equipped with water pumps 8 for pumping water.
[0029] The exhaust assembly 4 is installed on the evaporator 2 and the storage tank 3 to exhaust formaldehyde. The exhaust assembly 4 includes an exhaust pipe 41 and an exhaust pipe 42. The exhaust pipe 41 is fixedly connected to the top of the evaporator 2. The end of the exhaust pipe 41 away from the evaporator 2 extends into the storage tank 3 from the top and extends out of the storage tank 3 from the bottom. The exhaust pipe 42 is fixedly connected to the top of the storage tank 3.
[0030] There are two liquid level monitoring components 5, which are respectively located at the top of the evaporator 2 and the bottom of the storage tank 3.
[0031] In this embodiment, observation Figure 1 It can be observed that by setting a base 1, with an evaporator 2 fixedly connected to one side of the top of the base 1, it can be used to produce formaldehyde by evaporating a solution. However, since the water level in the evaporator 2 will drop after the solution evaporates, this will cause the evaporator 2 to burn out due to dry burning. Therefore, in Figure 1 It can also be found that the other side of the top of the base 1 is connected to the liquid storage tank 3. The liquid storage tank 3 is connected to the evaporation kettle 2 through the connecting pipe 6, which is used to replenish the evaporation solution to the evaporation kettle 2. The side wall of the liquid storage tank 3 is connected to the liquid inlet pipe 7. Both the liquid inlet pipe 7 and the connecting pipe 6 are equipped with water pumps 8 for pumping water. At this time, the solution can be continuously replenished into the evaporation kettle 2 through the water pump 8 to ensure the normal operation of the evaporation kettle 2.
[0032] The addition of a new solution will inevitably lower the temperature inside the evaporator, thus slowing down the evaporation efficiency of formaldehyde and reducing the production efficiency of formaldehyde, thereby increasing the production cost of formaldehyde.
[0033] Therefore, observe Figure 2 It can be observed that an exhaust pipe 41 is fixedly connected to the evaporator 2 to discharge formaldehyde gas. The exhaust pipe 41 is then fixedly connected to the top of the evaporator 2. The end of the exhaust pipe 41 away from the evaporator 2 extends into the storage tank 3 from the top and extends out of the storage tank 3 from the bottom. At this time, the gas that has just evaporated and is carrying heat will enter the storage tank 3 to preheat the solution in the storage tank 3, thereby increasing the initial temperature of the solution added to the evaporator 2 and reducing the temperature drop of the solution in the evaporator 2, thereby improving the evaporation efficiency of formaldehyde and reducing the production cost of formaldehyde.
[0034] Finally, since evaporation does not necessarily require the solution to boil, when the solution in storage tank 3 is heated, it will naturally evaporate at a lower rate. Therefore, formaldehyde will accumulate at the top of storage tank 3. Thus, observation is necessary. Figure 2 It can be seen that an exhaust pipe 42 is also connected to the top of the liquid storage tank 3, which can be used to discharge and collect the formaldehyde in the liquid storage tank 3, which can effectively improve the formaldehyde production efficiency.
[0035] In a further preferred embodiment of this utility model, such as Figure 2 As shown, the portion of the exhaust pipe 41 located inside the liquid storage tank 3 is spirally bent to form a spiral segment 9. The spiral segment 9 has multiple protrusions spaced along its length to make it a corrugated pipe. This effectively increases the length of the exhaust pipe 41 inside the liquid storage tank 3, thereby increasing the heat exchange area and the passage time of hot steam, improving the heating effect of the solution inside the liquid storage tank 3, and significantly improving the utilization efficiency of thermal energy.
[0036] In a further preferred embodiment of this utility model, such as Figure 2 As shown, a sleeve 10 is vertically fixedly connected to one end of the exhaust pipe 42 that extends into the liquid storage tank 3. A one-way valve 11 is fixedly connected to the bottom of the sleeve 10, which can prevent the solution from entering the exhaust pipe 42 through the bottom after the solution is added to the liquid storage tank 3, and ensure that the exhaust pipe 42 only discharges formaldehyde gas.
[0037] As the solution in the storage tank 3 is heated, the rising steam will condense at the top of the storage tank 3, thus producing condensate. Therefore, in order to prevent condensate from accumulating in the sleeve 10 and causing water to enter the exhaust pipe 42, a one-way valve 11 is installed at the bottom of the sleeve 10. At this time, the condensate falling into the sleeve 10 will be discharged through the one-way valve 11, thus preventing water from accumulating in the sleeve 10.
[0038] In a further preferred embodiment of this utility model, such as Figure 2 and Figure 4 As shown, the liquid level monitoring component 5 includes a slide rod 51, a slider 52, and a pressure switch 53. The slide rod 51 is fixedly connected to the bottom of the liquid storage tank 3. Pressure switches 53 are connected to both the top and bottom of the slide rod 51. A slider 52, which abuts against the pressure switches 53, is slidably connected to the outer wall of the slide rod 51. When the slider 52 slides down and presses against the pressure switch 53 at the bottom, the water pump 8 starts to replenish water. When the slider 52 abuts against the pressure switch 53 at the top, the water pump 8 stops. This can be used to control the solution level in the liquid storage tank 3 or the evaporator 2, preventing water shortage and overflow.
[0039] In a further preferred embodiment of this utility model, such as Figure 3 As shown, a float 12 is fixedly connected to the outer wall of the slider 52. The float 12 has a hollow cavity 13 inside to reduce weight, which allows the slider 52 to float up and down with the water level, ensuring the operational stability of the liquid level monitoring component 5.
[0040] In a further preferred embodiment of this utility model, such as Figure 4 As shown, an electric heating block 14 for evaporating the solution is fixedly connected to the inner wall of the evaporation vessel 2, and a stirring rod 15 for stirring the solution is rotatably mounted on the top of the evaporation vessel 2. Stirring promotes heat exchange between the liquid and the heating surface. By continuously moving the liquid, stirring reduces the stagnant layer formed in the liquid, thereby improving heat transfer efficiency. This means that the heat from the heating element can be transferred to the liquid more effectively, thus improving heating efficiency.
[0041] The implementation principle of the above embodiment is as follows: the solution is injected into the storage tank 3 by the water pump 8 through the liquid inlet pipe 7, and then the solution in the storage tank 3 is injected into the evaporation kettle 2 by the water pump 8 through the connecting pipe 6 to produce formaldehyde.
[0042] The evaporated formaldehyde enters the storage tank 3 through the exhaust pipe 41. The solution in the storage tank 3 is preheated by high-temperature steam, thereby increasing the temperature of the solution added to the evaporation kettle 2 and reducing the temperature drop in the evaporation kettle 2, thus effectively improving the formaldehyde production efficiency.
[0043] The embodiments described herein are preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model.
Claims
1. An evaporator for formaldehyde production, characterized in that, include: Base (1), used to provide support; An evaporator (2), which is installed on one side of the top of the base (1), is used to produce formaldehyde; The storage tank (3) is located on the other side of the top of the base (1). The storage tank (3) is connected to the evaporator (2) through the connecting pipe (6) and is used to replenish the evaporation solution to the evaporator (2). The side wall of the storage tank (3) is connected to the inlet pipe (7). Both the inlet pipe (7) and the connecting pipe (6) are equipped with water pumps (8) for pumping water. The exhaust assembly (4) is installed on the evaporator (2) and the storage tank (3) for exhausting formaldehyde. The exhaust assembly (4) includes an exhaust pipe one (41) and an exhaust pipe two (42). The exhaust pipe one (41) is fixedly connected to the top of the evaporator (2). The end of the exhaust pipe one (41) away from the evaporator (2) extends into the storage tank (3) from the top and extends out of the storage tank (3) from the bottom. The exhaust pipe two is fixedly connected to the top of the storage tank (3). There are two liquid level monitoring components (5), which are respectively located at the top of the evaporator (2) and the bottom of the storage tank (3).
2. The evaporator for formaldehyde production according to claim 1, characterized in that, The portion of the exhaust pipe (41) located inside the liquid storage tank (3) is spirally bent to form a spiral segment (9). The spiral segment (9) is provided with multiple protrusions at intervals along its length so that the spiral segment (9) is arranged as a corrugated pipe.
3. An evaporator for formaldehyde production according to claim 2, characterized in that, The exhaust pipe 2 (42) is vertically fixed to a sleeve (10) at one end that extends into the liquid storage tank (3), and a one-way valve (11) is fixedly connected to the bottom of the sleeve (10).
4. An evaporator for formaldehyde production according to claim 3, characterized in that, The liquid level monitoring component (5) includes a slide bar (51), a slider (52) and a pressure switch (53). The bottom of the liquid storage tank (3) is fixedly connected to the slide bar (51). The top and bottom of the slide bar (51) are both connected to the pressure switch (53). The outer wall of the slide bar (51) is slidably connected to the slider (52) for resisting the pressure switch (53).
5. An evaporator for formaldehyde production according to claim 4, characterized in that, A float (12) is fixedly connected to the outer wall of the slider (52), and a cavity (13) is provided inside the float (12) to reduce weight.
6. An evaporator for formaldehyde production according to claim 5, characterized in that, The inner wall of the evaporator (2) is fixedly connected to an electric heating block (14) for evaporating the solution, and the top of the evaporator (2) is rotatably equipped with a stirring rod (15) for stirring the solution.