Polymer polyol delivery apparatus with macromolecular dispersant

Abstract

The utility model discloses a macromolecule dispersant conveying device for polymer polyol, including dispersant storage tank and dispersant feed pump, the bottom of dispersant storage tank is connected with the import end of dispersant feed pump through bottom blowdown pipeline and basket strainer, the outside of basket strainer is connected with backwashing component, the utility model relates to polymer polyol production technical field, and the dispersant flowability is improved through heat exchange by setting up heat exchange coil in dispersant storage tank, and it is convenient to improve conveying convenience, with dispersant feed pump as power source, realizes dispersant feed, and adds and circulates the function, and the structure is compact, and the degree of integration is high, and the basket strainer is additionally arranged between material liquid main pipe and dispersant feed pump, and the solid deposit in dispersant is filtered and intercepts, and is additionally arranged with backwashing component, can regularly automatic backwashing of basket strainer, reduces maintenance difficulty.

Description

Technical Field

[0001] This utility model relates to the field of polymer polyol production technology, specifically to a macromolecular dispersant conveying device for polymer polyols. Background Technology

[0002] Polymer polyols are a widely used and consumed class of industrial raw materials. For example, polymer polyols such as polyether polyols and polyester polyols often form dispersions in the form of independent, non-contact polymer particles. These are used as raw materials to prepare polyurethane products such as polyurethane foams and polyurethane elastomers, effectively improving the various properties of these products. Therefore, the industrial demand for these polymer polyols continues to increase. In the production process of polyether polyols, a feed pump is typically used to add the polyether polyol macromolecular dispersant to the reactor. However, because the macromolecular dispersant may flocculate and produce some solid precipitates during preparation and storage, it affects subsequent production efficiency and can easily damage the feed pump. Therefore, this paper addresses these issues through in-depth research. Utility Model Content

[0003] To address the shortcomings of existing technologies, this invention provides a macromolecular dispersant delivery device for polymer polyols, which solves the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a polymer polyol macromolecular dispersant conveying device, comprising a dispersant storage tank and a dispersant feed pump. The bottom of the dispersant storage tank is connected to the inlet of the dispersant feed pump via a bottom drain pipe and a basket filter. A backwashing assembly is connected to the outside of the basket filter. The outlet of the dispersant feed pump is connected to a tee connector via a main feed pipe. One outlet of the tee connector is connected to a polymer polyol reactor via a feed line, and the other outlet of the tee connector is connected to the top of the dispersant storage tank via a circulation line. A heat exchange coil is installed inside the dispersant storage tank, and the outside of the heat exchange coil is connected to a steam line. A nitrogen line is connected to the top of the dispersant storage tank, and the nitrogen line is connected to a nitrogen source. A temperature sensor is installed inside the dispersant storage tank, and a level gauge is connected to the outside of the dispersant storage tank.

[0005] A discharge valve is installed on the aforementioned bottom discharge pipeline. A three-way connector is installed on the side of the discharge valve near the dispersant feed pump. A feed valve is installed at one end of the three-way connector, and a metal hose is connected to the other end of the feed valve.

[0006] The backwashing assembly includes a return water three-way valve and a flushing three-way valve installed at both ends of the basket filter inlet and outlet. The inlet end of the flushing three-way valve is connected to a backwashing pump, and the inlet end of the backwashing pump is connected to the cleaning water tank.

[0007] A check valve is installed between the above-mentioned main liquid pipe and the three-way connector.

[0008] A feeding control valve is installed on the aforementioned feeding pipeline, and a circulation control valve is installed on the circulation pipeline.

[0009] The dispersant storage tank is equipped with a breather valve on the top and a manhole on the side. Beneficial effects

[0010] This invention provides a conveying device for macromolecular dispersants used in polymer polyols. It offers the following advantages: This device improves upon existing dispersant storage tanks and conveying mechanisms used in polymer polyol production processes, enhancing the stability of macromolecular dispersant delivery. A heat exchange coil within the dispersant storage tank improves dispersant flowability through heat exchange, facilitating convenient delivery. Using a dispersant feed pump as the power source, it achieves dispersant feeding, addition, and circulation functions, featuring a compact structure and high integration. A basket filter is added between the main feed pipe and the dispersant feed pump to filter and intercept solid precipitates in the dispersant, and a backwashing component is added for periodic automatic backwashing of the basket filter, reducing maintenance difficulty. Temperature sensors and level gauges allow for real-time monitoring of the dispersant temperature and liquid level in the dispersant storage tank, facilitating rapid temperature adjustment and dispersant replenishment. A nitrogen source is connected to the top of the dispersant storage tank via a nitrogen pipeline for nitrogen protection of the dispersant. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the arrangement structure of the polymer polyol macromolecular dispersant delivery device of this utility model.

[0012] In the diagram: 1. Dispersant storage tank; 2. Dispersant feed pump; 3. Bottom drain line; 4. Basket filter; 5. T-joint; 6. Feed line; 7. Circulation line; 8. Heat exchange coil; 9. Steam line; 10. Nitrogen line; 11. Nitrogen source; 12. Temperature sensor; 13. Level gauge; 14. Discharge valve; 15. T-joint; 16. Feed valve; 17. Metal hose; 18. Return water t-valve; 19. Flushing t-valve; 20. Backwash pump; 21. Cleaning water tank; 22. Check valve; 23. Feed control valve; 24. Circulation control valve; 25. Breathing valve; 26. Manhole. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0014] Example: Refer to the appendix of the instruction manual Figure 1 As can be seen, this application specifically designs a macromolecular dispersant conveying device for polymer polyols, including a dispersant storage tank 1 and a dispersant feed pump 2. The bottom of the dispersant storage tank 1 is connected to the inlet end of the dispersant feed pump 2 via a bottom drain pipe 3 and a basket filter 4. A backwashing component is connected to the outside of the basket filter 4. The outlet end of the dispersant feed pump 2 is connected to a three-way connector 5 via a main feed pipe. One outlet of the three-way connector 5 is connected to the polymer polyol reactor via a feed pipe 6, and the other outlet of the three-way connector 5 is connected to the top of the dispersant storage tank 1 via a circulation pipe 7. A heat exchange coil 8 is installed inside the dispersant storage tank 1, and the outside of the heat exchange coil 8 is connected to a steam pipe 9. A nitrogen pipe 10 is connected to the top of the dispersant storage tank 1, and the nitrogen pipe 10 is connected to a nitrogen source 11. A temperature sensor 12 is installed inside the dispersant storage tank 1, a level gauge 13 is connected to the outside of the dispersant storage tank 1, and a breather valve 25 is installed on the top of the dispersant storage tank 1. A manhole 26 is provided on the side; the existing dispersant storage tank 1 and dispersant conveying mechanism used in the production process of polymer polyols are improved to enhance the conveying stability of macromolecular dispersants. A heat exchange coil 8 is installed in the dispersant storage tank 1 to improve the flowability of the dispersant through heat exchange, which facilitates the conveying convenience; the dispersant feed pump 2 is used as the power source to realize the functions of dispersant feeding, adding and circulation, with a compact structure and high degree of integration; a basket filter 4 is added between the main liquid pipe and the dispersant feed pump 2 to filter and intercept solid precipitates in the dispersant, and a backwashing component is added to automatically backwash the basket filter 4 periodically, reducing maintenance difficulty; the temperature of the dispersant and the liquid level in the dispersant storage tank 1 can be monitored in real time through the temperature sensor 12 and the liquid level gauge 13, which facilitates rapid temperature adjustment and dispersant replenishment; the top of the dispersant storage tank 1 is connected to a nitrogen source 11 through a nitrogen pipeline 10 to provide nitrogen protection for the dispersant.

[0015] In the specific implementation process, a discharge valve 14 is installed on the bottom discharge pipeline 3. A three-way connector 15 is installed on the side of the discharge valve 14 near the dispersant feed pump 2. A feed valve 16 is installed at one end of the three-way connector 15, and a metal hose 17 is connected to the other end of the feed valve 16. A one-way valve 22 is installed between the main liquid pipe and the three-way connector 5. A feed control valve 23 is installed on the feed pipeline 6, and a circulation control valve 24 is installed on the circulation pipeline 7. The tank or tanker containing the macromolecular dispersant liquid is moved to the side of the dispersant storage tank 1. The metal hose 17 is inserted into the tank or tanker. The dispersant feed pump 2 is started, and the feed valve 16 and the circulation control valve 24 on the circulation pipeline 7 are opened to discharge the liquid. The dispersant is temporarily stored in the dispersant storage tank 1. After addition, nitrogen gas source 11 is turned on and nitrogen is injected through nitrogen pipeline 10 for protection. After the addition is completed, feed valve 16 is closed. When it is necessary to add macromolecular dispersant into the reactor, the bottom valve at the lower end of the dispersant storage tank 1 and the discharge valve 14 on the bottom discharge pipeline 3 are opened, circulation control valve 24 is closed and feed control valve 23 is opened. The liquid in the dispersant storage tank 1 is added to the reactor through the dispersant feed pump. After the addition is completed, feed control valve 23 is closed and circulation control valve 24 is opened to realize the internal circulation of macromolecular dispersant liquid in the dispersant storage tank 1 from bottom to top. This can effectively prevent the macromolecular dispersant from flocculating in the storage tank and avoid precipitation.

[0016] In the specific implementation process, as a preferred setting, the above-mentioned backwashing assembly includes a return water three-way valve 18 and a flushing three-way valve 19 installed at both ends of the basket filter 4. The inlet end of the flushing three-way valve 19 is connected to the backwashing pump 20, and the inlet end of the backwashing pump 20 is connected to the cleaning water tank 21. During the feeding or circulation process, the macromolecular dispersant liquid will first pass through the basket filter 4 to filter and intercept the solid particles in the liquid before entering the dispersant supply pump, so as to improve the protection of the dispersant supply pump. When maintaining the dispersant storage tank 1, the basket filter 4 also needs to be cleaned. The specific operation is as follows: adjust the valve positions of the return water three-way valve 18 and the flushing three-way valve 19 to isolate the basket filter 4 from the feed pipeline system. Start the backwash pump 20, and use the backwash pump 20 to extract the flushing liquid in the flushing water tank and inject it into the basket filter 4 through the flushing three-way valve 19 to backwash the filter screen in the basket filter 4. The flushed wastewater is discharged through the return water three-way valve 18. The operation is simple and highly automated.

[0017] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, the phrase "comprising an element defined as..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0018] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for conveying macromolecular dispersants for polymer polyols, comprising a dispersant storage tank and a dispersant feed pump, characterized in that, The bottom of the dispersant storage tank is connected to the inlet of the dispersant feed pump via a bottom drain pipe and a basket filter. A backwashing assembly is connected to the outside of the basket filter. The outlet of the dispersant feed pump is connected to a T-junction via a main feed pipe. One outlet of the T-junction is connected to the polymer polyol reactor via a feed line, and the other outlet of the T-junction is connected to the top of the dispersant storage tank via a circulation line. A heat exchange coil is installed inside the dispersant storage tank and is connected to a steam line. A nitrogen line is connected to the top of the dispersant storage tank and is connected to a nitrogen source. A temperature sensor is installed inside the dispersant storage tank, and a level gauge is connected to the outside of the dispersant storage tank.

2. The polymer polyol macromolecular dispersant delivery device according to claim 1, characterized in that, A discharge valve is installed on the bottom discharge pipeline. A three-way connector is installed on the side of the discharge valve near the dispersant feed pump. A feed valve is installed at one end of the three-way connector, and a metal hose is connected to the other end of the feed valve.

3. The polymer polyol macromolecular dispersant delivery device according to claim 2, characterized in that, The backwashing assembly includes a return water three-way valve and a flushing three-way valve installed at both ends of the basket filter inlet and outlet. The inlet end of the flushing three-way valve is connected to a backwashing pump, and the inlet end of the backwashing pump is connected to the cleaning water tank.

4. The polymer polyol macromolecular dispersant delivery device according to claim 1, characterized in that, A one-way valve is installed between the main feed pipe and the three-way connector.

5. The polymer polyol macromolecular dispersant delivery device according to claim 1, characterized in that, A feeding control valve is installed on the feeding pipeline, and a circulation control valve is installed on the circulation pipeline.

6. The polymer polyol macromolecular dispersant delivery device according to claim 1, characterized in that, The dispersant storage tank is equipped with a breather valve on the top and a manhole on the side of the dispersant storage tank.

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