TDI material feeding system

Abstract

The utility model discloses a TDI (toluene diisocynate) material feeding system which comprises a storage tank, a first gas compression tank, a reaction kettle, a pipeline assembly, a flow meter and a driving pump, the pipeline assembly comprises a first material conveying pipe and a first gas conveying pipe, the first material conveying pipe is connected with the storage tank and the reaction kettle, and the first gas compression tank is connected with the first material conveying pipe through the first gas conveying pipe; the flow meter is arranged on the first conveying pipe; the driving pump is arranged on the first conveying pipe; wherein the first gas compression tank can discharge air in the first conveying pipe, the storage tank and the reaction kettle before conveying materials; in the material conveying process, the driving pump can provide driving force for the materials in the storage tank so that the materials can be conveyed to the reaction kettle along the first conveying pipe, and the flow meter can detect the materials. The TDI material feeding system provided by the utility model can save gas resources and improve the stability of material measurement.

Description

Technical Field

[0001] The utility model relates to the technical field of plastic production, in particular to a TDI material feeding system. Background Art

[0002] Synthesizing a curing agent requires the use of 2,4-toluene diisocyanate (TDI), and the proportion of 2,4-toluene diisocyanate in the formula is 30% to 49%. The existing 2,4-toluene diisocyanate feeding system opens a pneumatic valve by a Distributed Control System (DCS), starts a rotor pump to transport 2,4-toluene diisocyanate in a storage tank to a high-level tank. The high-level tank is weighed by a weighing sensor and then fed to a reaction kettle. The whole transportation process is controlled by the distributed control system.

[0003] 2,4-toluene diisocyanate is liable to react with water vapor, resulting in deterioration, and requires that it cannot be in contact with air for a long time during storage. The feeding system is provided with a high-level tank for storing materials. During the production process, nitrogen needs to be filled into the high-level tank to discharge air.

[0004] The problems existing in the existing feeding system are that each time the feeding system is used, nitrogen needs to be filled into the high-level tank, consuming too much gas resources. Secondly, after the high-level tank is used a certain number of times, its weighing sensor is liable to generate errors. Moreover, when the high-level tank is idle, it is difficult to avoid air entering the high-level tank. Combined with the material flowing and hanging on the tank wall, the material contacts with air to generate white waste, affecting the product quality. Summary of the Utility Model

[0005] The utility model aims to solve at least one of the technical problems existing in the prior art. For this purpose, the utility model provides a TDI material feeding system, which can save gas resources and improve the stability of material measurement.

[0006] The TDI material feeding system according to the first aspect embodiment of the utility model includes:

[0007] A storage tank;

[0008] A first gas compression tank;

[0009] A reaction kettle;

[0010] A pipeline assembly, including a first material conveying pipe and a first gas conveying pipe. The first material conveying pipe connects the storage tank and the reaction kettle, and the first gas compression tank is connected to the first material conveying pipe through the first gas conveying pipe;

[0011] A flowmeter, provided on the first material conveying pipe;

[0012] A driving pump is provided on the first material conveying pipe;

[0013] Wherein, the first gas compression tank can discharge the air in the first material conveying pipe, the storage tank and the reaction kettle before conveying the material; during the process of conveying the material, the driving pump can provide driving force for the material in the storage tank, so that the material is conveyed along the first material conveying pipe to the reaction kettle, and the flowmeter measures the flow rate of the material.

[0014] The TDI material feeding system according to the embodiment of the present invention has at least the following beneficial effects: the first material conveying pipe connects the storage tank and the reaction kettle, the driving pump and the flowmeter are both arranged on the first material conveying pipe, and the first gas conveying pipe connects the first gas compression tank and the first material conveying pipe; before conveying the material, the first gas compression tank outputs compressed gas, and the compressed gas enters the first material conveying pipe, the storage tank and the reaction kettle through the first gas conveying pipe, and discharges the internal air; during the process of conveying the material, the driving pump provides driving force for the material, so that the material starts from the storage tank and reaches the reaction kettle along the first material conveying pipe, and passes through the flowmeter on the way, and the flowmeter measures the flow rate of the passing material; compared with the existing technical solutions, the TDI material feeding system does not need to convey gas to devices such as a high-level tank, saves gas resources, and the use of the flowmeter improves the stability of material measurement, thereby improving the product quality.

[0015] According to some embodiments of the present invention, the first material conveying pipe is further provided with a buffer structure for slowing down the conveying speed of the material, and the buffer structure is located at the front end of the flowmeter along the material conveying direction.

[0016] According to some embodiments of the present invention, the buffer structure is configured as a U-shaped pipe, and two U-shaped pipes are arranged side by side along the material conveying direction.

[0017] According to some embodiments of the present invention, the bending directions of the two U-shaped pipes are the same.

[0018] According to some embodiments of the present invention, the first material conveying pipe is further provided with a plurality of manual valves and a plurality of pneumatic valves.

[0019] According to some embodiments of the present invention, manual valves are provided at both ends of the driving pump along the material conveying direction, both ends of the flowmeter along the material conveying direction, and the rear end of the reaction kettle along the material conveying direction, and pneumatic valves are provided on the first material conveying pipe between the two manual valves.

[0020] According to some embodiments of the present invention, the pipeline assembly further includes an exhaust pipe, the intake end of the exhaust pipe is connected to the storage tank and the reaction kettle, and the outlet end of the exhaust pipe is connected to an exhaust gas treatment system.

[0021] According to some embodiments of the present utility model, the pipeline assembly further includes a second material conveying pipe, the second material conveying pipe is connected to the storage tank, and the second material conveying pipe is used for feeding the storage tank.

[0022] According to some embodiments of the present utility model, it further includes a second gas compression tank, the pipeline assembly further includes a second gas conveying pipe, and the second gas conveying pipe is connected to the second gas compression tank and the reaction kettle.

[0023] According to some embodiments of the present utility model, it further includes a control module, and the control module is used to control the first material conveying pipe and control the opening and closing of the first gas conveying pipe.

[0024] Additional aspects and advantages of the present utility model will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the present utility model. Description of the Drawings

[0025] The following further describes the present utility model in conjunction with the drawings and embodiments, where:

[0026] Figure 1 It is a schematic diagram of a TDI material feeding system according to an embodiment of the present utility model.

[0027] Reference Signs:

[0028] Storage tank 1, reaction kettle 2, first gas compression tank 3, second gas compression tank 4, driving pump 5, flow meter 6, buffer structure 7, first material conveying pipe 8, second material conveying pipe 9, first gas conveying pipe 10, second gas conveying pipe 11, exhaust pipe 12, control module 13, manual valve 14, pneumatic valve 15. Detailed Embodiments

[0029] The following details the embodiments of the present utility model. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation to the present utility model.

[0030] In the description of the present utility model, it should be understood that for the orientation description, such as the orientation or positional relationship indicated by up, down, front, back, left, right, etc., is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0031] In the description of the present utility model, the meaning of "several" is one or more, the meaning of "multiple" is more than two, and understandings such as "greater than", "less than", "exceeding", etc. do not include the base number, while understandings such as "above", "below", "within", etc. include the base number. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0032] In the description of the present utility model, unless otherwise clearly defined, words such as "set", "installed", "connected", etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in the present utility model in combination with the specific content of the technical solution.

[0033] The curing agent, also known as hardener, curing agent or setting agent, is a kind of substance or mixture that promotes or controls the curing reaction. The synthesis of the curing agent requires the use of 2,4-toluene diisocyanate (Tolylene-2,4-diisocyanate, TDI), and the proportion of 2,4-toluene diisocyanate in the formula is 30% to 49%.

[0034] The existing 2,4-toluene diisocyanate feeding system includes a storage tank and a high-level tank. The pneumatic valve is opened by the Distributed Control System (DCS), and the rotor pump is started to transport the 2,4-toluene diisocyanate in the storage tank to the high-level tank. The high-level tank is weighed by a weighing sensor and then fed to the reaction kettle. The entire transportation process is controlled by the distributed control system.

[0035] 2,4-toluene diisocyanate is likely to react with water vapor and thus deteriorate, requiring that it cannot be in contact with air for a long time during storage. The feeding system is provided with a high-level tank for storing materials. During the production process, nitrogen needs to be filled into the high-level tank to discharge air.

[0036] The problems existing in the existing feeding system are that each time the feeding system is used, nitrogen needs to be filled into the high-level tank, consuming too much gas resources. Secondly, after the high-level tank is used a certain number of times, its weighing sensor is prone to errors. Moreover, when the high-level tank is idle, it is difficult to avoid air entering the high-level tank. Combined with the material flowing and hanging on the tank wall, the material contacts the air and generates white waste, affecting the product quality.

[0037] In view of the above technical problems, the embodiment of the present utility model proposes a TDI material feeding system, which can save gas resources, improve the accuracy of detecting materials, and improve the product quality.

[0038] The following combines Figure 1 as shown, to describe the TDI material feeding system of the embodiment of the present utility model.

[0039] Refer to Figure 1 As shown, in the embodiment of the present utility model, the TDI material feeding system includes a storage tank 1 for storing materials, such as raw materials for producing plastics, for example, 2,4-toluene diisocyanate liquid. An exhaust port is provided at the top of the storage tank 1, and a feed port and a discharge port are provided at the side. The exhaust port is used to discharge the air in the tank, the feed port is used for the input of external materials, and the discharge port is used for the output of the materials in the tank.

[0040] It should be noted that, in the embodiment of the present utility model, the storage tank 1 is a metal tank, such as a galvanized iron tank or a stainless steel tank. Since 2,4-toluene diisocyanate is sensitive to moisture, if a plastic tank is used for storage, milky turbid substances are likely to appear and cannot be clarified even after heating.

[0041] In addition, when storing 2,4-toluene diisocyanate in the storage tank 1, its airtight state should be ensured to prevent moisture in the air from entering and affecting the quality of the materials.

[0042] Refer to Figure 1 As shown, in the embodiment of the present utility model, the TDI material feeding system further includes a first feeding pipe 8 and a reaction kettle 2, and the first feeding pipe 8 connects the storage tank 1 and the reaction kettle 2. The materials in the storage tank 1 reach the reaction kettle 2 via the first feeding pipe 8. The reaction kettle 2 is also provided with a feed port, a discharge port and an exhaust port. The feed port is used for inputting materials, the discharge port is used for outputting the materials after the reaction is completed, and the exhaust port is used for discharging the gas in the reaction kettle 2.

[0043] It should be noted that, in the embodiment of the present utility model, a driving pump 5 is provided on the side of the first feeding pipe 8 close to the storage tank 1, and the driving pump 5 is used to drive the materials in the storage tank 1 to move into the reaction kettle 2. The driving pump 5 is configured as a rotor pump, for example, a gear pump, a screw pump, a rotary piston pump, etc.

[0044] It should be noted that, in the embodiment of the present utility model, a flow meter 6 is further provided on the first feeding pipe 8, and the flow meter 6 is located at the front end of the driving pump 5 along the material conveying direction, and the flow meter 6 is used to measure the flow rate of the passing materials.

[0045] It should be noted that, in the embodiment of the present utility model, in order to make the measurement of the flow meter 6 more accurate, a buffer structure 7 for slowing down the material conveying speed is provided at the rear end of the flow meter 6. The buffer structure 7 is configured as a U-shaped pipe, and there are two U-shaped pipes arranged side by side along the material conveying direction. When the material passes through the U-shaped pipe, its travel will become longer and the speed will slow down. Among them, the bending directions of the U-shaped pipes are the same. Such a design can enable the material to pass through more corners, the conveying direction changes multiple times, and more kinetic energy is lost, and the speed reduction effect is more obvious.

[0046] Refer toFigure 1 As shown, in the embodiment of the present utility model, the TDI material feeding system further includes a first gas pipeline 10 and a first gas compression tank 3. The first gas compression tank 3 is used to compress nitrogen, and the first gas pipeline 10 connects the first gas compression tank 3 and the first material pipeline 8. The compressed gas of the first gas compression tank 3 enters the first material pipeline 8 through the first gas pipeline 10, and then enters the storage tank 1 and the reaction kettle 2 to discharge the air in the first material pipeline 8, the storage tank 1 and the reaction kettle 2.

[0047] It should be noted that the operating pressure range of the compressed gas is 0.5 Mpa to 0.7 Mpa.

[0048] It should be noted that the first gas pipeline 10 and the first material pipeline 8 are included in the pipeline assembly. In addition, in the embodiment of the present utility model, the pipeline assembly further includes an exhaust pipe 12 and a second material pipeline 9. The inlet end of the exhaust pipe 12 is connected to the exhaust ports of the storage tank 1 and the reaction kettle 2, and the outlet end of the exhaust pipe 12 is connected to the waste gas treatment system. The second material pipeline 9 is connected to the inlet of the storage tank 1 and an external feeding device.

[0049] Refer to Figure 1 As shown, in the embodiment of the present utility model, the TDI material feeding system further includes a second gas compression tank 4. The pipeline assembly further includes a second gas pipeline 11, and the second gas pipeline 11 connects the second gas compression tank 4 and the reaction kettle 2. The second gas compression tank 4 is used to compress nitrogen, which can provide nitrogen for the reaction kettle 2 to ensure the stability of the gas environment in the reaction kettle 2 and improve the reaction quality.

[0050] Refer to Figure 1 As shown, in the embodiment of the present utility model, the TDI material feeding system further includes a control module 13, and the control module 13 is used to control the first material pipeline 8 and the opening and closing of the first gas pipeline 10.

[0051] It should be noted that in the embodiment of the present utility model, the first material pipeline 8 is also provided with a plurality of manual valves 14 and a plurality of pneumatic valves 15. Manual valves 14 are arranged at both ends of the rotor pump along the material conveying direction, both ends of the flowmeter 6 along the material conveying direction, and the rear end of the reaction kettle 2 along the conveying direction. Pneumatic valves 15 are arranged on the first material pipeline 8 between the two manual valves 14. The control module 13 is electrically connected to the pneumatic valves 15 to control the opening and closing of the pneumatic valves 15.

[0052] The working principle of the TDI material feeding system according to the embodiment of the present utility model is as follows: Open the first gas compression tank 3, and compress the gas to 0.5 Mpa to 0.7 Mpa; Check the storage volume of the material in the storage tank 1, open the manual valve 14 of the first material conveying pipe 8, open the pneumatic valve 15 through the control module 13, and start the driving pump 5. The material is driven by the driving pump 5 and moves from the storage tank 1 to the flowmeter 6. The flowmeter 6 measures the flow rate of the passing material. During this period, the U-shaped pipe slows down the moving speed of the material and improves the measurement accuracy. Finally, the material moves to the reaction kettle 2; When the weight of the material entering the reaction kettle 2 is consistent with the requirement on the batching list, close the pneumatic valve 15 and the manual valve 14.

[0053] The TDI material feeding system is metered by the flowmeter 6, which is accurate and stable.

[0054] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the knowledge scope of those of ordinary skill in the art to which the present utility model pertains, various changes can be made without departing from the purpose of the present utility model.

Claims

1. TDI material feeding system, characterized in that, Comprising: Storage tank; First gas compression tank; Reactor; Pipeline assembly, including a first material conveying pipe and a first gas conveying pipe, the first material conveying pipe connecting the storage tank and the reactor, and the first gas compression tank connecting to the first material conveying pipe through the first gas conveying pipe; Flowmeter, provided on the first material conveying pipe; Driving pump, provided on the first material conveying pipe; Wherein, the first gas compression tank can discharge the air in the first material conveying pipe, the storage tank and the reactor before conveying the material; during the conveying of the material, the driving pump can provide driving force for the material in the storage tank to enable the material to be conveyed along the first material conveying pipe to the reactor, and the flowmeter can measure the flow rate of the material.

2. The TDI material feeding system according to claim 1, wherein The first material conveying pipe is further provided with a buffer structure for slowing down the conveying speed of the material, and the buffer structure is located at the front end of the flowmeter along the material conveying direction.

3. The TDI material feeding system according to claim 2, wherein The buffer structure is configured as a U-shaped pipe, and two U-shaped pipes are arranged side by side along the material conveying direction.

4. The TDI material feeding system according to claim 3, characterized in that The bending directions of the two U-shaped pipes are the same.

5. The TDI material feeding system according to claim 1, characterized in that, The first material conveying pipe is further provided with a plurality of manual valves and a plurality of pneumatic valves.

6. The TDI material feeding system according to claim 5, wherein, Manual valves are provided at both ends of the driving pump along the material conveying direction, both ends of the flowmeter along the material conveying direction, and the rear end of the reactor along the material conveying direction, and pneumatic valves are provided on the first material conveying pipe between the two manual valves.

7. The TDI material feeding system according to claim 1, wherein, The pipeline assembly further includes an exhaust pipe, the intake end of the exhaust pipe is connected to the storage tank and the reactor, and the outlet end of the exhaust pipe is connected to an exhaust gas treatment system.

8. The TDI material feeding system according to claim 1, characterized in that, The pipeline assembly further includes a second material conveying pipe, the second material conveying pipe is connected to the storage tank, and the second material conveying pipe is used for feeding the storage tank.

9. The TDI material feeding system according to claim 1, wherein It further includes a second gas compression tank, and the pipeline assembly further includes a second gas conveying pipe, and the second gas conveying pipe is connected to the second gas compression tank and the reactor.

10. The TDI material feeding system according to claim 1, characterized in that, It further includes a control module, and the control module is used to control the first material conveying pipe and control the opening and closing of the first gas conveying pipe.

Images