A kind of acetic anhydride vaporization preheating mechanism

Abstract

The utility model discloses an acetic anhydride vaporization preheating mechanism, which belongs to the technical field of chemical industry. The utility model comprises a fixed frame, on which a plurality of tank bodies containing acetic anhydride raw materials are arranged; an inlet pipe fitting with a plurality of output ends, the inlet pipe fitting output ends are connected with the tank bodies, and a first valve is arranged on the inlet pipe fitting; and an outlet pipe fitting with a plurality of input ends, the outlet pipe fitting input ends are connected with the tank bodies, and a second valve is arranged on the outlet pipe fitting. The utility model introduces the acetic anhydride raw materials into the plurality of tank bodies at different time points and at the same time intervals. In the process of continuous introduction, the first tank body receiving the acetic anhydride raw materials will first complete the preheating operation of the acetic anhydride raw materials, and then export them. After the exporting, the second tank body receiving the acetic anhydride raw materials will then complete the preheating operation of the acetic anhydride raw materials.

Description

Technical Field

[0001] The utility model relates to the technical field related to chemical industry, in particular to an acetic anhydride vaporization preheating mechanism. Background Art

[0002] Acetic anhydride, also known as acetic anhydride, is a colorless transparent liquid with a strong pungent odor and corrosiveness. It plays an important role in the chemical industry, especially in the manufacture of cellulose acetate, acetic acid plastics, non-flammable film and other fields. In the production process of acetic anhydride, the preheating structure usually refers to the process of heating the raw materials before entering the vaporizer. This step is to allow the raw materials to reach a suitable temperature to improve their vaporization efficiency in the vaporizer.

[0003] Preheating can be achieved in many ways, such as through a heat exchanger, a heating furnace or electric heating, among which electric heating converts electrical energy into thermal energy by means of resistance heating, and then heats a tank containing raw materials for acetic anhydride production, and the tank is connected to a vaporization structure device for acetic anhydride. After the raw materials for acetic anhydride production in the tank are heated to a certain temperature, the heated raw materials in the tank are introduced into the vaporization structure device. This method is simple to operate, clean and environmentally friendly.

[0004] When using a tank to heat the raw materials, generally, the acetic anhydride raw materials are first filled into the tank, and then the tank is heated by a heating device, and then the heating device is turned off to stop heating the tank, and then the raw materials in the tank that have been heated to a certain temperature are introduced into the vaporization device, and then the raw materials are vaporized. However, when the above process is used in operation, the raw materials are heated once and then transported once, and during the transportation, the tank is not in a working state, which will waste a certain amount of time. For the preheating process of the acetic anhydride raw materials, the operation process appears to be incoherent, which will reduce the vaporization efficiency of acetic anhydride. Utility Model Content

[0005] The embodiment of the utility model provides an acetic anhydride vaporization preheating mechanism to solve the above-mentioned technical problems.

[0006] The embodiment of the utility model adopts the following technical solution: comprising a fixing frame, on which a plurality of tanks containing acetic anhydride raw materials are arranged;

[0007] An inlet pipe having a plurality of output ends, wherein the output ends of the inlet pipe are connected to the tank body, and a No. 1 valve is provided on the inlet pipe;

[0008] An outlet pipe fitting having a plurality of input ends, wherein the input end of the outlet pipe fitting is connected to the tank body, and a No. 2 valve is provided on the outlet pipe fitting;

[0009] A heating element is arranged on the tank body and is used to heat the acetic anhydride raw material inside the tank body.

[0010] Furthermore, the heating element includes a No. 1 heating wire in contact with the outer side wall of the tank body, and the No. 1 heating wire is spiral and extends along the axis direction of the tank body.

[0011] Furthermore, the heating element also includes a rotating plate rotatably connected to the bottom of the tank body, and a plurality of snake-shaped No. 2 heating wires are connected inside the rotating plate.

[0012] Furthermore, a motor is installed on the tank body, and one end of the rotating plate extends to the outside of the tank body and is connected to the output end of the motor.

[0013] Furthermore, a water pump is provided on the input end of the inlet pipe fitting and the output end of the outlet pipe fitting.

[0014] Furthermore, the tank body is provided with a temperature sensor for real-time detection of the internal temperature of the tank body.

[0015] Furthermore, a controller is provided on the fixing frame.

[0016] At least one of the above technical solutions adopted in the embodiment of the utility model can achieve the following beneficial effects:

[0017] In the utility model, by arranging a plurality of tank bodies and outlet pipe fittings and inlet pipe fittings connected to the tank bodies, the acetic anhydride raw material is introduced into the plurality of tank bodies at different time points and at the same time intervals. In the process of continuous introduction, the first tank body receiving the acetic anhydride raw material will first complete the preheating operation of the acetic anhydride raw material and then export it. After exporting, the second tank body receiving the acetic anhydride raw material will then complete the preheating operation of the acetic anhydride raw material. By analogy, the acetic anhydride raw material can be preheated without affecting the continuity and coherence of introducing the acetic anhydride raw material into the vaporization device, thereby improving the preheating effect of the acetic anhydride raw material and improving the use efficiency of the vaporization device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0019] Figure 1 The three-dimensional structure of the utility model is shown in FIG. Figure 1 ;

[0020] Figure 2 The three-dimensional structure of the utility model is shown in FIG. Figure 2 ;

[0021] Figure 3 It is a schematic diagram of the isometric side section structure of the utility model;

[0022] Figure 4 It is a schematic diagram of the explosion of the tank body and the internal structure of the tank body of the utility model;

[0023] Figure 5 This is a schematic diagram of the structure of the export pipe fitting of the utility model;

[0024] Figure 6 This is a schematic diagram of the structure of the introduction pipe of the utility model.

[0025] Figure numerals: 1. fixing frame; 2. tank body; 3. inlet pipe; 30. valve No. 1; 4. outlet pipe; 40. valve No. 2; 5. heating wire No. 1; 6. rotating plate; 60. heating wire No. 2; 7. motor; 8. water pump; 9. temperature sensor; 10. controller; 11. protective plate. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in combination with the specific embodiments of the utility model and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] The technical solutions provided by various embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0028] The embodiment of the utility model provides an acetic anhydride vaporization preheating mechanism, comprising a fixing frame 1, on which a controller 10 is provided, and on which a plurality of tank bodies 2 for containing acetic anhydride raw materials are provided, wherein the plurality of tank bodies 2 have the same structure, and when in use, the acetic anhydride raw materials are first placed in one of the tank bodies 2, and then placed in another tank body 2, and so on, and after being placed in the plurality of tank bodies 2, the contact time between each acetic anhydride raw material located in the tank body 2 and the tank body 2 is different.

[0029] The inlet pipe 3 has a plurality of output ends, the output end of the inlet pipe 3 is connected to the tank body 2, and a valve No. 1 30 is provided on the inlet pipe 3. The valve No. 1 30 is set as an electromagnetic valve and is also a multi-way valve. The purpose is to control it through the controller 10 when it is not manually operated, and then to control the connection state between the input end and the plurality of output ends. The output end of the inlet pipe 3 passes through the bottom of the tank body 2 and extends to the inside of the tank body 2 and is close to the inner bottom wall of the tank body 2. When in use, the acetic anhydride raw material is introduced into the tank body 2 through the inlet pipe 3. In the process of introducing into the tank body 2, the valve No. 1 30 on the inlet pipe 3 controls the connection between the plurality of output ends and the input end one by one. When one of the output ends of the introduction pipe fitting 3 is connected to the input end, the acetic anhydride raw material will flow into the tank body 2 connected to the input end through the introduction pipe fitting 3. After the tank body 2 is filled, the No. 1 valve 30 controls the connection between the other output end and the input end of the introduction pipe fitting 3, while the input end just used for feeding is closed. By analogy, when the No. 1 valve 30 controls the input end on the introduction pipe fitting 3 to be connected to only one of the output ends, the acetic anhydride raw material can be filled in several tank bodies 2 in turn. After a certain number of tank bodies 2 are filled, the contact time between the first tank body 2 to be filled and the acetic anhydride raw material inside it is the longest.

[0030] The export pipe fitting 4 has several input ends, and the input end of the export pipe fitting 4 is connected to the tank body 2. The export pipe fitting 4 is provided with a second valve 40. The second valve 40 is set as an electromagnetic valve and is a multi-pass valve. The characteristics are consistent with the first valve 30. The purpose is to control it through the controller 10 when it is not manually operated, and then to control the connection state between the output end and the several input ends. The output end of the export pipe fitting 4 passes through the top of the tank body 2 and extends to the inside of the tank body 2 and is close to the inner bottom wall of the tank body 2. The purpose is to allow the export pipe fitting 4 to be used, and the input end can The acetic anhydride raw material can be more thoroughly extracted from the tank body 2. When the acetic anhydride raw material is extracted, the No. 2 valve 40 controls the connection relationship between the output end of the export pipe fitting 4 and several input ends. When the No. 2 valve 40 controls the connection between one of the input ends and the output end, the acetic anhydride raw material in the tank body 2 connected thereto can be extracted through the input end. Under the cooperation between the export pipe fitting 4 and the import pipe fitting 3, the export pipe fitting 4 exports the acetic anhydride raw material that has been in contact with the tank body 2 for the longest time, and then imports it into the next vaporization equipment through the output end of the export pipe fitting 4.

[0031] A water pump 8 is provided on the input end of the inlet pipe fitting 3 and the output end of the outlet pipe fitting 4. The water pump 8 is powered by the inlet pipe fitting 3 and the outlet pipe fitting 4 when extracting the acetic anhydride raw material. The water pump 8 is electrically connected to the controller 10. The controller 10 can be used to set the working time of the water pump 8 and control its running time.

[0032] The heating element is arranged on the tank body 2 and is used to heat the acetic anhydride raw material inside the tank body 2. The acetic anhydride raw material introduced into the tank body 2 through the introduction pipe 3 will gradually increase in temperature under the action of the heating element until it reaches a suitable temperature, and then it will be exported from the tank body 2 through the outlet pipe 4.

[0033] Among them, Figure 3-4 As shown, the heating element includes a No. 1 heating wire 5 in contact with the outer wall of the tank body 2. The No. 1 heating wire 5 is spiral and extends along the axis direction of the tank body 2. By connecting the No. 1 heating wire 5 to an external power source, the No. 1 heating wire 5 will heat the side wall of the tank body 2, and the heat will be conducted to the inside of the tank body 2 through the side wall of the tank body 2. The acetic anhydride raw material inside the tank body 2 will absorb and receive the heat and gradually heat up. After the temperature rises to a certain level, the No. 1 heating wire 5 stops working. The No. 1 heating wire 5 is spiral mainly because the spiral shape can cover the outer wall of the tank body 2 and is easy to use. When heating, the side wall of the tank body 2 can be heated evenly, so that the acetic anhydride raw material inside it can be evenly heated in the part that contacts the side wall of the tank body 2.

[0034] When in use, in order to protect the No. 1 heating wire 5 and reduce the heat loss of the No. 1 heating wire 5, a protective plate 11 is fixedly installed on the outer wall of the No. 1 heating wire 5, and the protective plate 11 is fixedly connected to the tank body 2. At this time, the No. 1 heating wire 5 is located between the protective plate 11 and the side wall of the tank body 2, and the protective plate 11 is fixedly connected to the fixing frame 1, and the fixing frame 1 can support and fix the tank body 2 through the protective plate 11.

[0035] Furthermore, the heating element further comprises a rotating plate 6 rotatably connected to the bottom of the tank body 2, and a plurality of snake-shaped No. 2 heating wires 60 are connected inside the rotating plate 6. When the rotating plate 6 and the No. 2 heating wires 60 are located inside the tank body 2, it is convenient to heat the acetic anhydride raw material inside the tank body 2. When the heating element heats the acetic anhydride raw material, the No. 1 heating wire 5 mainly heats a portion of the acetic anhydride raw material close to the side wall of the tank body 2 quickly. The acetic anhydride raw material contains a large amount of acetic anhydride, and acetic anhydride is volatile when heated, so the power of the No. 1 heating wire 5 cannot be too high. The No. 1 heating wire 5 is set to a suitable power and is The acetic anhydride raw material inside the tank body 2 is heated slowly to ensure the stability of the acetic anhydride raw material. The No. 1 heating wire 5 with a relatively small output power is insufficient to quickly and comprehensively heat the acetic anhydride raw material inside the tank body 2, which will lead to the extension of the working time of the outlet pipe 4 to extract the acetic anhydride raw material inside the tank body 2, and finally lead to the efficiency of the overall structural device. By setting the No. 2 heating wire 60 located inside the tank body 2, the acetic anhydride raw material can be preheated by heating the inside of the acetic anhydride raw material in conjunction with the use of the No. 1 heating wire 5, and the efficiency is higher.

[0036] Furthermore, Figure 3 As shown, a motor 7 is installed on the tank body 2, and one end of the rotating plate 6 extends to the outside of the tank body 2 and is connected to the output end of the motor 7. The motor 7 drives the rotating plate 6 to rotate, and the rotating plate 6 will disturb the acetic anhydride raw material located inside the tank body 2 when rotating. The acetic anhydride raw material after the disturbance will be more evenly heated, thereby achieving the purpose of quickly and evenly heating the acetic anhydride raw material.

[0037] The tank body 2 is provided with a temperature sensor 9 for real-time detection of the internal temperature of the tank body 2. When the temperature of the acetic anhydride raw material in the tank body 2 rises, the temperature sensor 9 on the tank body 2 will lower the temperature of the acetic anhydride raw material in the tank body 2 in real time and upload the temperature information to the controller 10, and the controller 10 will control and adjust the water pump 8, valve No. 1 30 and valve No. 2 40.

[0038] When in use, the inlet pipe 3 will still hold the acetic anhydride raw material in the tank 2, and then several tanks 2 will preheat the acetic anhydride raw material in turn. When the first tank 2 receiving the acetic anhydride raw material completes the preheating work, the controller 10 controls the second valve 40 and the water pump 8 connected to the outlet pipe 4 to extract the acetic anhydride raw material located in the tank 2. After the acetic anhydride raw material in the tank 2 is completely extracted, the controller 10 controls the second valve 40 to connect the input end with the second tank 2 receiving the acetic anhydride raw material, and the acetic anhydride in the tank 2 is discharged from the output end of the outlet pipe 4. Anhydride raw materials, and so on, ensure that during the preheating process, the device structure can continuously introduce the preheated acetic anhydride raw materials into the vaporization equipment, and during the introduction process, the temperature data of the acetic anhydride raw materials in different tanks 2 are close. Under the overall setting of the controller 10, the water pump 8, the No. 1 valve 30 and the No. 2 valve 40 are used in conjunction with each other to continuously introduce and export the acetic anhydride raw materials to the tank 2. Compared with the prior art, this method can continuously introduce the acetic anhydride raw materials while keeping the temperature similar, thereby enhancing the preheating effect of the acetic anhydride raw materials and improving the use efficiency of the vaporization equipment.

[0039] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.

Claims

1. An acetic anhydride vaporization preheating mechanism, characterized in that: include; A fixed frame (1), wherein a plurality of tanks (2) containing acetic anhydride raw materials are arranged on the fixed frame (1); An inlet pipe (3) having a plurality of output ends, the output end of the inlet pipe (3) being connected to the tank body (2), and a first valve (30) being provided on the inlet pipe (3); An outlet pipe fitting (4) having a plurality of input ends, wherein the input end of the outlet pipe fitting (4) is connected to the tank body (2), and a second valve (40) is provided on the outlet pipe fitting (4); A heating element is arranged on the tank body (2) and is used to heat the acetic anhydride raw material inside the tank body (2).

2. The acetic anhydride vaporization preheating mechanism according to claim 1, characterized in that: The heating element comprises a first heating wire (5) in contact with the outer wall of the tank body (2); the first heating wire (5) is spiral and extends along the axial direction of the tank body (2).

3. The acetic anhydride vaporization preheating mechanism according to claim 1, characterized in that: The heating element further comprises a rotating plate (6) rotatably connected to the bottom of the tank body (2), wherein a plurality of snake-shaped No. 2 heating wires (60) are connected inside the rotating plate (6).

4. The acetic anhydride vaporization preheating mechanism according to claim 3, characterized in that: A motor (7) is mounted on the tank body (2), and one end of the rotating plate (6) extends to the outside of the tank body (2) and is connected to the output end of the motor (7).

5. The acetic anhydride vaporization preheating mechanism according to claim 1, characterized in that: A water pump (8) is provided on the input end of the inlet pipe (3) and on the output end of the outlet pipe (4).

6. The acetic anhydride vaporization preheating mechanism according to claim 1, characterized in that: The tank body (2) is provided with a temperature sensor (9) for detecting the internal temperature of the tank body (2) in real time.

7. The acetic anhydride vaporization preheating mechanism according to claim 1, characterized in that: A controller (10) is provided on the fixing frame.

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