Polyester polyol tank car loading system

Abstract

The utility model relates to the technical field of chemical engineering, and discloses a polyester polyol tank car charging system which comprises a reaction kettle, the top of the reaction kettle is communicated with a recovery pipe, the bottom of the reaction kettle is communicated with a first conveying pipe, the first conveying pipe is communicated with a discharging pipeline, and a first communicating pipe and a second communicating pipe are inserted into the discharging pipeline. Before the materials are loaded, a part of high-temperature materials are firstly conveyed, and residues in the pipeline can be fully heated and mixed through the high-temperature materials, so that the residues of the previous batch are thoroughly cleaned, the problem that the residues are mixed with the residues in the initial stage of material loading at this time can be avoided, and the material loading efficiency is improved. According to the invention, the unicity of material loading is ensured, after the materials are loaded, the residual materials in the pipeline are pushed into the tank car through nitrogen purging and steam heating purging in sequence, the residual quantity of the material loading is reduced, and the high-temperature materials which are firstly conveyed can be further treated through the treatment assembly.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical industry, in particular to a polyester polyol tank truck loading system. Background Art

[0002] As one of the main raw materials for polyurethane production, polyester polyols can be divided into many types according to their structure and properties, including but not limited to: aromatic polyester polyols, aliphatic polyester polyols, bio-based polyester polyols, modified polyester polyols and many other types.

[0003] In existing polyester polyol loading systems, when the production cycle ends and the product is ready to be discharged to a tanker, impurities are typically removed through a filter. A discharge pump then transfers the polyester polyol product through a discharge pipeline to the tanker. However, this process presents a significant problem: some material residue inevitably remains in the discharge pipeline, discharge pump, and filter. This residue directly affects the accuracy of the next discharge, as the initial discharge is not pure new product but a mixture of residues from the previous discharge. This inaccuracy is particularly detrimental in applications requiring high metering accuracy. Furthermore, when the physical properties of the polyester polyol discharged differ significantly, the residue problem not only reduces accuracy but can also lead to serious cross-contamination.

[0004] In order to solve the above problems, a purge mechanism is generally introduced in the existing polyester polyol loading system. That is, after a loading operation is completed, gas (such as nitrogen, compressed air, etc.) is injected into the discharge pipeline to try to push the polyester polyol residue in the pipeline into the tank truck. Although this method can effectively reduce the residue of low-viscosity liquid, different types of polyester polyols have different physical and chemical properties. When it comes to some special polyester polyols, the effect of the purge mechanism is greatly reduced. For example, when facing high-viscosity polyester polyols, due to their poor fluidity and strong adhesion, even under the action of purge gas, it is difficult to be completely removed from the pipeline system. Therefore, in the subsequent loading process, the new batch of polyester polyols and the residues of the previous batch will still be mixed. Based on this, the applicant purposefully provides a polyester polyol tank truck loading system that can prevent the residues of the previous batch in the pipeline from affecting the discharge of the new batch of polyester polyols. Utility Model Content

[0005] The purpose of the utility model is to address the shortcomings of the existing technology and provide a polyester polyol tank truck loading system that can prevent the residue of the previous batch in the pipeline from affecting the discharge of a new batch of polyester polyols, so as to solve the technical problem that the purge mechanism in the existing polyester polyol loading system cannot be applied to different types of polyester polyols.

[0006] The purpose of the utility model can be achieved through the following technical solutions:

[0007] A polyester polyol tank truck loading system includes a reactor, the top of which is connected to a recovery pipe, the bottom of the reactor is connected to a first feed pipe, the first feed pipe is connected to a discharge pipe, the discharge pipe is connected with a first connecting pipe and a second connecting pipe, the first connecting pipe is connected to a nitrogen pipeline, the second connecting pipe is connected to a steam purge pipeline, the discharge end of the discharge pipe is connected to a first three-way stop valve, one discharge port of the first three-way stop valve is connected to a metal hose, and the other discharge port is connected to a processing component through a first connecting pipe, the processing component includes a circulation component, a second three-way stop valve and a recovery barrel, the feed end of the second three-way stop valve is connected to the first connecting pipe, one discharge port of the second three-way stop valve is connected to the recovery pipe through the circulation component, and the other discharge port is connected to the recovery barrel.

[0008] As a further solution of the present invention: there are multiple reactors and processing components, and each reactor has a corresponding processing component.

[0009] As a further solution of the present invention: the circulation component includes a material storage tank, a circulation pipe, a second material delivery pipe and a circulation pump. The material storage tank is fixedly mounted on an external mounting frame. The feeding end of the circulation pipe is connected to the discharge port of the second three-way stop valve away from the recovery barrel, and its discharge end is connected to the top of the material storage tank. The feeding end of the second material delivery pipe is connected to the bottom of the material storage tank, and its discharge end is connected to the recovery pipe through a second connecting pipe. The circulation pump is arranged on the second material delivery pipe.

[0010] As a further solution of the present invention: each of the material storage tanks is fixedly mounted on an external mounting frame via a bearing plate, a plurality of weighing modules are fixedly mounted on the bearing plate, and each weighing module carries a material storage tank.

[0011] As a further solution of the present invention: each recycling bin is provided with a label.

[0012] As a further solution of the present invention: the reactor and the material storage tank are both provided with heating pipelines.

[0013] Beneficial effects of the utility model:

[0014] 1. In the present invention, before loading materials, a portion of high-temperature materials is first transported. The high-temperature materials can fully heat and mix the residues in the pipeline, thereby completely cleaning the residues of the previous batch. This ensures that there is no problem of mixing with the residues in the initial stage of loading the current material, ensuring the uniformity of the material loading. After the material is loaded, nitrogen purge and steam heating purge are performed in sequence to push the residual material in the pipeline into the tank truck, reducing the residual amount of the material loaded this time. The high-temperature material transported first can be further processed by the processing component.

[0015] 2. In the present invention, the high-temperature material transported before loading is mixed with the residue. Based on the physical properties of the material transported in the previous batch, it is determined whether the material transported this time can be recycled after being mixed with the material transported in the previous batch. If it can be recycled, the material is introduced into the circulation component and can be circulated to the reactor later. If it cannot be recycled, the material is introduced into the recovery barrel for recycling;

[0016] 3. In the present invention, different types of polyester polyol materials are completely isolated by setting up multiple reactors and processing components, so that different types of materials can be processed using different processing components, thereby ensuring that during the processing stage, different types of polyester polyol materials can flow through different pipes, that is, the residual materials in different pipes are different, which also ensures the singleness of the materials in the pipes and avoids the problem of material mixing caused by cross-use of pipes. At the same time, because the residues of the mixture of two different materials can be recovered by different recovery barrels, subsequent processing is convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below with reference to the accompanying drawings.

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 This utility model Figure 1 A schematic diagram of the enlarged structure of part A;

[0020] Figure 3 It is a structural schematic diagram of the first connecting pipe and the second connecting pipe in the utility model.

[0021] In the figure: 1. Reactor; 2. First feed pipe; 201. Filter box; 202. Discharge pump; 3. Discharge pipeline; 4. First three-way stop valve; 5. Second three-way stop valve; 6. Processing component; 7. Recovery pipe; 8. Recovery barrel; 801. Label; 9. First connecting pipe; 10. Second connecting pipe; 11. Loading plate; 12. Material storage tank; 13. Circulation pipe; 14. Second feed pipe; 15. Circulation pump; 16. Metal hose; 17. Weighing module; 18. First connecting pipe; 19. Second connecting pipe. DETAILED DESCRIPTION

[0022] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] See also Figure 1-Figure 3 As shown, the utility model is a polyester polyol tanker loading system, comprising a reactor 1, the top of which is connected to a recovery pipe 7, the bottom of the reactor 1 is connected to a first feed pipe 2, the first feed pipe 2 is connected to a discharge pipe 3, the discharge pipe 3 is plugged with a first connecting pipe 9 and a second connecting pipe 10, the first connecting pipe 9 is connected to a nitrogen pipeline, the second connecting pipe 10 is connected to a steam purge pipeline, the discharge end of the discharge pipe 3 is connected to a first three-way stop valve 4, one discharge port of the first three-way stop valve 4 is connected to a metal hose 16, and the other discharge port is connected to a processing component 6 through a first connecting pipe 18, the processing component 6 includes a circulation component, a second three-way stop valve 5 and a recovery barrel 8, the feeding end of the second three-way stop valve 5 is connected to the first connecting pipe 18, one discharge port of the second three-way stop valve 5 is connected to the recovery pipe 7 through a circulation component, and the other discharge port is connected to the recovery barrel 8.

[0024] In one case of this embodiment, a filter box 201 and a discharge pump 202 are provided on the first feed pipe 2, and the filter box 201 is located between the reactor 1 and the discharge pump 202. It should be noted that the filter box 201, the discharge pump 202, the nitrogen pipeline, the steam purge pipeline and the three-way stop valve described in the present invention are all existing technologies, and the present invention does not improve them. Therefore, there is no need to disclose their specific mechanical structure and circuit structure, which does not affect the integrity of the present invention.

[0025] In actual application of this embodiment, after the polyester polyol material in the reactor 1 is qualified, it is cooled to the specified packaging temperature. Before loading, the physical properties of the material delivered in the previous batch are used to determine whether the material delivered this time can be recycled after being mixed with the material delivered in the previous batch, so as to select the flow direction of the material in the processing component 6. If it is determined that it can be recycled, the operator manually controls the second three-way stop valve 5 so that the first connecting pipe 18 is connected to the circulation component through the second three-way stop valve 5. At this time, the material flows to the circulation component through the second three-way stop valve 5; if it is determined that it cannot be recycled, the operator manually controls the second three-way stop valve 5 so that the first connecting pipe 18 is connected to the recovery barrel 8 through the second three-way stop valve 5. At this time, the material falls into the recovery barrel 8 through the second three-way stop valve 5 and is recycled;

[0026] Before loading the material in the reactor 1 into the tank truck, the operator first controls the first three-way stop valve 4 so that the discharge pipe 3 is connected to the first connecting pipe 18 through the first three-way stop valve 4, and then starts the discharge pump 202 to transport 400-800 kg of high-temperature material in the reactor 1 through the first feed pipe 2 to the discharge pipe 3. On the way, the material will be filtered through the filter box 201, and the material in the discharge pipe 3 will be transported to the processing component 6 through the first three-way stop valve 4 and the first connecting pipe 18. It is judged whether the material can be recycled after being mixed with the material transported in the previous batch. If it can be recycled, the material in the second three-way stop valve 5 will flow to the circulation component and finally flow back into the reactor 1; otherwise, the material in the second three-way stop valve 5 will fall into the recovery bucket 8 and be recycled;

[0027] The flow direction of the above two materials is based on the premise that a part of the high-temperature material will pass through the first delivery pipe 2 and the discharge pipe 3, and the high-temperature material can directly clean up the residues of the previous batch in the pipe. At this time, the materials remaining in the first delivery pipe 2 and the discharge pipe 3 are the materials that need to be loaded this time. At this time, the operator connects the metal hose 16 with the tank truck inlet, and then controls the first three-way stop valve 4 so that the discharge pipe 3 is connected to the tank truck through the first three-way stop valve 4. At this time, the material in the reactor 1 can be discharged into the tank truck through the first delivery pipe 2, the discharge pipe 3 and the metal hose 16. After the discharge is completed, nitrogen is introduced through the nitrogen pipeline through the first connecting pipe 9, and the nitrogen purges the material into the tank truck. The nitrogen is maintained for a period of time and then stops. Then the second connecting pipe 10 is further purged by steam heating to minimize the residual material in the pipeline during this loading.

[0028] Before loading the materials, a portion of the high-temperature materials is transported first to thoroughly clean up the residues of the previous batch, ensuring that there is no problem of mixing with the residues in the initial stage of this material loading, ensuring the singleness of the material loading. After the materials are loaded, nitrogen purging and steam heating purging are used in succession to push the residual materials in the pipeline into the tank truck, reducing the residual amount of this material loading.

[0029] like Figure 1-Figure 3 As shown in FIG. 1 , as a preferred embodiment of the present invention, there are multiple reactors 1 and multiple processing components 6 , and each reactor 1 has a corresponding processing component 6 .

[0030] In actual application, this embodiment completely isolates different types of polyester polyol materials through the arrangement of multiple reactors 1 and processing components 6, so that different types of materials can be processed using different processing components 6, thereby ensuring that during the processing stage, different types of polyester polyol materials can flow through different pipes, that is, the residual materials in different pipes are different, which also ensures the uniformity of the materials in the pipes and avoids the problem of material mixing caused by cross-use of pipes. At the same time, because the residues of the mixture of two different materials can be recovered by different recovery barrels 8, subsequent processing is convenient.

[0031] like Figure 1-Figure 3 As shown, as a preferred embodiment of the present invention, the circulation component includes a material storage tank 12, a circulation pipe 13, a second feed pipe 14 and a circulation pump 15. The material storage tank 12 is fixedly mounted on an external mounting frame. The feed end of the circulation pipe 13 is connected to the discharge port of the second three-way stop valve 5 away from the recovery barrel 8, and its discharge end is connected to the top of the material storage tank 12. The feed end of the second feed pipe 14 is connected to the bottom of the material storage tank 12, and its discharge end is connected to the recovery pipe 7 through the second connecting pipe 19. The circulation pump 15 is arranged on the second feed pipe 14.

[0032] In actual application of this embodiment, through the setting of the material storage tank 12, the 400-800 kg of high-temperature materials transported before loading and the mixed residues of the previous batch will first be transported to the material storage tank 12 and temporarily stored. After the loading is completed, the materials in the different material storage tanks 12 can be pumped into the appropriate reactor 1 for recycling, thereby improving the utilization efficiency of the materials in the material storage tank 12.

[0033] like Figure 2 As shown, as a preferred embodiment of the present invention, each of the material storage tanks 12 is fixedly mounted on an external mounting frame through a supporting plate 11, and a plurality of weighing modules 17 are fixedly mounted on the supporting plate 11, and each weighing module 17 carries a material storage tank 12.

[0034] In actual application of this embodiment, it should be noted that the weighing module 17 described in the present invention is a prior art, and the present invention does not improve them. Therefore, there is no need to disclose their specific mechanical structure and circuit structure, which does not affect the integrity of the present invention. The weighing module 17 can accurately measure the amount of recycled materials, thereby optimizing various links in the production process, such as the feed amount, reaction time, etc., thereby improving production efficiency and product quality.

[0035] like Figure 1 As shown, as a preferred embodiment of the present invention, each recycling bin 8 is provided with a label 801 .

[0036] In actual application, this embodiment provides a corresponding label 801 on each recycling bin 8 , which can directly display the type of polyester polyol waste in the recycling bin 8 , thereby facilitating subsequent processing.

[0037] like Figure 1-Figure 3 As shown, as a preferred embodiment of the present invention, the reactor 1 and the material storage tank 12 are both provided with heating pipelines.

[0038] In one case of this embodiment, the first feed pipe 2, the discharge pipe 3, the circulation pipe 13, the second feed pipe 14 and the recovery pipe 7 are all provided with steam heating, which is used to increase the temperature in the pipe to prevent condensation during material transportation; the heating pipeline can be heated by thermal oil. Unlike steam heating, thermal oil heating has a higher temperature and is more suitable for storing large amounts of materials in the reactor 1 and the material storage tank 12, avoiding the problem of high crystallization and high viscosity materials being difficult to circulate through the pipeline due to long storage time.

[0039] Working principle of the present invention: The above embodiment of the present invention provides a polyester polyol tanker loading system. When the polyester polyol material in the reactor 1 is qualified, it is cooled to the specified packaging temperature. Before loading, the physical properties of the material delivered in the previous batch are used to determine whether the material delivered this time can be recycled after being mixed with the material delivered in the previous batch. The flow direction of the material in the processing component 6 is selected. If it is determined that it can be recycled, the operator manually controls the second three-way stop valve 5 so that the first connecting pipe 18 is connected to the circulation component through the second three-way stop valve 5. At this time, the material flows to the circulation component through the second three-way stop valve 5; if it is determined that it cannot be recycled, the operator manually controls the second three-way stop valve 5 so that the first connecting pipe 18 is connected to the recovery barrel 8 through the second three-way stop valve 5. At this time, the material flows to the circulation component through the second three-way stop valve 5. Valve 5 falls into the recovery barrel 8 and is recovered. Before loading the material in the reactor 1 into the tank truck, the operator first controls the first three-way stop valve 4 so that the discharge pipe 3 is connected to the first connecting pipe 18 through the first three-way stop valve 4, and then turns on the discharge pump 202 to transport 400-800kg of high-temperature material in the reactor 1 through the first feed pipe 2 to the discharge pipe 3. On the way, the material will be filtered through the filter box 201, and the material in the discharge pipe 3 will be transported to the processing component 6 through the first three-way stop valve 4 and the first connecting pipe 18. It is judged whether the material can be recycled after being mixed with the material transported in the previous batch. If it can be recycled, the material in the second three-way stop valve 5 will flow to the circulation component and can eventually flow back into the reactor 1; otherwise, the material in the second three-way stop valve 5 will fall into the recovery barrel 8 and be recycled.

[0040] The above describes an embodiment of the present invention in detail. However, the above content is only a preferred embodiment of the present invention and should not be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent application of the present invention.

Claims

1. A polyester polyol tanker loading system, characterized in that: The invention comprises a reactor (1), the top of which is connected to a recovery pipe (7), the bottom of the reactor (1) is connected to a first feed pipe (2), the first feed pipe (2) is connected to a discharge pipe (3), a first connecting pipe (9) and a second connecting pipe (10) are connected to the discharge pipe (3), the first connecting pipe (9) is connected to a nitrogen pipeline, the second connecting pipe (10) is connected to a steam purge pipeline, the discharge end of the discharge pipe (3) is connected to a first three-way stop valve (4), one discharge port of the first three-way stop valve (4) is connected to a metal hose (16), and the other discharge port thereof is connected to a processing component (6) through a first connecting pipe (18), the processing component (6) comprises a circulation component, a second three-way stop valve (5) and a recovery barrel (8), the feed end of the second three-way stop valve (5) is connected to the first connecting pipe (18), one discharge port of the second three-way stop valve (5) is connected to the recovery pipe (7) through the circulation component, and the other discharge port thereof is connected to the recovery barrel (8).

2. A polyester polyol tanker loading system according to claim 1, characterized in that: There are multiple reactors (1) and multiple processing components (6), and each reactor (1) has a corresponding processing component (6).

3. A polyester polyol tanker loading system according to claim 2, characterized in that: The circulation assembly comprises a material storage tank (12), a circulation pipe (13), a second material delivery pipe (14) and a circulation pump (15). The material storage tank (12) is fixedly mounted on an external mounting frame. The feeding end of the circulation pipe (13) is connected to the discharge port of the second three-way stop valve (5) away from the recovery barrel (8), and its discharge end is connected to the top of the material storage tank (12). The feeding end of the second material delivery pipe (14) is connected to the bottom of the material storage tank (12), and its discharge end is connected to the recovery pipe (7) through a second connecting pipe (19). The circulation pump (15) is arranged on the second material delivery pipe (14).

4. A polyester polyol tanker loading system according to claim 3, characterized in that: Each of the material storage tanks (12) is fixedly mounted on an external mounting frame via a bearing plate (11), a plurality of weighing modules (17) are fixedly mounted on the bearing plate (11), and each weighing module (17) carries a material storage tank (12).

5. A polyester polyol tanker loading system according to claim 1, characterized in that: Each recycling bin (8) is provided with a label (801).

6. A polyester polyol tanker loading system according to claim 3, characterized in that: The reactor (1) and the material storage tank (12) are both provided with heating pipelines.

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