Energy-saving polymer polyol sampling device

Abstract

The utility model relates to the technical field of polymer polyol sampling, and particularly discloses an energy-saving polymer polyol sampling device which comprises a closed sampling chamber with a transparent window and a side door, a medium feeding pipeline is arranged in the closed sampling chamber and is connected with a medium discharging pipeline, and the medium discharging pipeline is connected with the closed sampling chamber. A sampling pipe is connected to the joint of the medium discharging pipeline and the medium feeding pipeline, the sampling pipe is connected with a nitrogen purging pipeline, a threaded connector matched with a sampling bottle is arranged at a sampling opening of the sampling pipe, the sampling bottle is sleeved with a sampling bottle film sleeve molded by polyurethane, and the closed sampling chamber is further connected with a tail gas absorption pipeline. In the sampling process, operators can be prevented from being in direct contact with high-temperature, high-pressure or harmful materials, and the safety of the operators is guaranteed. The device can be integrated with a production line to reduce manual operation and improve production efficiency. The reasonably designed sampling device can reduce loss and waste of materials in the sampling process.

Description

An energy-saving polymer polyol sampling device Technical Field

[0001] This utility model relates to the field of polymer polyol sampling technology, specifically an energy-saving polymer polyol sampling device. Background Technology

[0002] Polymer polyols are a new type of modified polyether polyol that has emerged with the development of the application field of polyurethane foam. At present, the main polyether polyol used in China is the polyether polyol based on flexible foam. In the presence of stabilizers, the polymer monomers styrene and acrylonitrile are produced in the polyether medium by batch or continuous methods to produce polymer polyol containing polyacrylonitrile (or styrene and acrylonitrile copolymer) particles. Since polymer polyols retain the original flexibility of the polyether chain and increase the good mechanical properties (such as rigidity and flame retardancy) of the branched vinyl polymer, the application field of high solid content polymer polyol products has been expanding in the past ten years. In the production and storage process of polymer polyols, it is necessary to continuously take samples for analysis to ensure that accurate samples are obtained in the production process and to monitor the quality of the products. Since the conversion rate of polymer monomers styrene and acrylonitrile in the reaction process does not reach 100%, from a safety point of view, manual sampling may pose the following risks: (1) Physical injury: Polymer polyols are usually viscous liquids. When manually sampling, improper operation may cause splashing, which may adhere to the skin and cause irritation or injury. (2) Health Risks: Some types of polymer polyols may contain unreacted monomers or other chemical substances, and long-term or large-scale exposure may have health effects. Furthermore, after cooling, polymer polyol products have high viscosity, and existing sampling devices may become clogged when handling high-viscosity materials or materials containing solid particles, affecting sampling efficiency. In addition, with increasing emphasis on environmental protection, there is a growing demand for accurate and comprehensive online analytical instruments. However, online analyzers are expensive, complex to operate, not suitable for online analysis of all indicators, have inaccurate data, and are difficult to maintain offline, preventing the widespread adoption of online samplers in all chemical industries. Therefore, an energy-saving polymer polyol sampling device is proposed. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing an energy-saving polymer polyol sampling device to solve the problems mentioned in the background section.

[0004] To achieve the above objectives, this utility model provides the following technical solution: an energy-saving polymer polyol sampling device, comprising a sealed sampling chamber with a transparent window and a side door, wherein a medium inlet pipeline is provided inside the sealed sampling chamber, a sampling tube is connected to the connection between the medium outlet pipeline and the medium inlet pipeline, the sampling tube is connected to a nitrogen purging pipeline, the sampling port of the sampling tube is provided with a threaded interface matching the sampling bottle, the sampling bottle is covered with a polyurethane molded sampling bottle film sleeve, and the sealed sampling chamber is also connected to a tail gas absorption pipeline.

[0005] As a preferred embodiment of this utility model, the medium inlet pipeline is equipped with valve C at one end near the medium outlet pipeline, the medium outlet pipeline is equipped with valve B at one end near valve C, and the sampling tube is equipped with valve A at one end near valve B.

[0006] As a preferred embodiment of this utility model, one end of the medium discharge pipeline is provided with a medium outlet.

[0007] As a preferred embodiment of this utility model, one end of the medium feed pipeline is provided with a medium inlet, and a thermometer is installed on the medium feed pipeline.

[0008] As a preferred embodiment of this utility model, one end of the nitrogen purging pipeline is provided with a nitrogen purging port, and a nitrogen pipeline check valve, a nitrogen self-regulating valve, a nitrogen manual valve and a pressure gauge are installed on the nitrogen purging pipeline.

[0009] As a preferred technical solution of this utility model, one end of the exhaust gas absorption pipeline is provided with a vent, and a multi-stage activated carbon adsorption system is installed on the exhaust gas absorption pipeline.

[0010] Compared with the prior art, the beneficial effects of this utility model are:

[0011] This device can accurately sample from different locations in the production process, ensuring sample representativeness and improving the accuracy of analytical results. During sampling, it avoids direct contact between operators and high-temperature, high-pressure, or hazardous materials, ensuring personnel safety. It can be integrated with the production line, reducing manual operation and improving production efficiency. A well-designed sampling device can minimize material loss and waste during the sampling process. Attached Figure Description

[0012] Figure 1 is a schematic diagram of the structure of this utility model.

[0013] In the diagram: 1-Media outlet; 2-Media inlet; 3-Nitrogen purging port; 4-Vent port; 5-Sampling bottle; 6-Polyurethane molded sampling bottle membrane sleeve; 7-Sealed sampling chamber; 8-Nitrogen pipeline check valve; 9-Nitrogen self-regulating valve; 10-Nitrogen manual valve; 11-Pressure gauge; 12-Thermometer; 13-Multi-stage activated carbon adsorption system; 14-Sampling tube; 101-Media outlet pipeline; 102-Media inlet pipeline; 301-Nitrogen purging pipeline; 401-Tail gas absorption pipeline; 1-1, Valve A; 1-2, Valve B; 1-3, Valve C. Detailed Implementation

[0014] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more definite definition of the scope of protection of the present invention.

[0015] Example: Please refer to Figure 1. This utility model provides a technical solution: an energy-saving polymer polyol sampling device, including a sealed sampling chamber 7 with a transparent window and a side door. The sealed sampling chamber 7 is provided with a medium inlet pipeline 102. A sampling tube 14 is connected to the connection between the medium outlet pipeline 101 and the medium inlet pipeline 102. The sampling tube 14 is connected to the connection between the medium outlet pipeline 101 and the medium outlet pipeline 101. The sampling tube 14 is connected to a nitrogen purging pipeline 301. The sampling port of the sampling tube 14 is provided with a threaded interface that matches the sampling bottle 5. The sampling bottle 5 is covered with a polyurethane molded sampling bottle film sleeve 6. The sealed sampling chamber 7 is also connected to a tail gas absorption pipeline 401.

[0016] A valve C1-3 is installed at one end of the medium feed line 102 near the medium discharge line 101, a valve B1-2 is installed at one end of the medium discharge line 101 near the valve C1-3, and a valve A1-1 is installed at one end of the sampling pipe 14 near the valve B1-2.

[0017] One end of the medium discharge pipeline 101 is provided with a medium outlet 1.

[0018] One end of the medium feed line 102 is provided with a medium inlet 2, and a thermometer 12 is installed on the medium feed line 102.

[0019] One end of the nitrogen purging line 301 is provided with a nitrogen purging port 3, and the nitrogen purging line 301 is equipped with a nitrogen line check valve 8, a nitrogen self-regulating valve 9, a nitrogen manual valve 10 and a pressure gauge 11.

[0020] One end of the exhaust gas absorption pipeline 401 is provided with an vent 4, and a multi-stage activated carbon adsorption system 13 is installed on the exhaust gas absorption pipeline 401.

[0021] Energy-saving principle: Polymer polyols have high viscosity at low temperatures. To prevent burns to operators, the sampling point typically needs to be cooled. However, when the cooled polymer polyol is sent to the quality control department for analysis, it needs to be reheated for accurate weighing. This sampling device does not involve cooling of the heat medium; instead, the sampling bottle is treated with a special material. Rigid polyurethane foam is molded onto the outside of the glass sampling bottle, forming a 1cm thick insulating film. Therefore, when sent to the quality control department, the low-temperature, viscous polymer polyol does not need to be reheated, effectively saving energy.

[0022] Operating principle:

[0023] Step 1: The operator opens the side door of the sealed sampling chamber 7 and rotates the 250ml / 500ml sampling bottle with the polyurethane molded sampling bottle membrane sleeve 6 onto the threaded interface. Then close the side door of the sealed sampling chamber 7.

[0024] Step 2: Open the nitrogen manual valve 10 on the sampler panel and check the pressure gauge 11 on the sampler panel to confirm that the nitrogen pipeline is functioning correctly. The normal operating range of pressure gauge 11 is 0.1-0.3 MPa, which is controlled by the operator manually adjusting the nitrogen manual valve 10. Nitrogen enters the sampling bottle 5 through the nitrogen purging line 301 to replace the air inside the sampling bottle 5. The purged exhaust gas then goes to the multi-stage activated carbon adsorption system 13 through the exhaust gas absorption line 401, and the adsorbed gas is released through the vent. The time for the operator to purge the sampling bottle with nitrogen is approximately 1 minute, which can be extended or shortened depending on the actual situation.

[0025] Step 3: After purging the sampling bottle with nitrogen, the operator switches the valve on the panel from the closed position to the circulation position. At this time, valves C1-3 and B1-2 are in the open position, and valve A1-1 is in the closed position. The operator can observe whether material is entering the sampling line through the thermometer 12 on the medium inlet line 102. When the temperature is lower than the normal value, it can be determined that the line is blocked. The collected polymer polyol returns to the flash tank filter from the outlet of the flash tank filter through the medium inlet line 102, valve C1-3, valve B1-2, and the medium outlet line 101. This cycle is repeated for 5-10 minutes to ensure that the collected sample is representative.

[0026] Step 4: After the cycle time is satisfied, the operator switches the valve on the panel from the cycle position to the sampling position. At this time, valves A1-1 and C1-3 are in the open position, and valve B1-2 is in the closed position. The polymer polyol flows from the medium feed line 102 into the sampling bottle. The operator observes the amount in the sampling bottle through the transparent window of the sealed sampling chamber 7. When the sample amount in the sampling bottle reaches or slightly exceeds the top of the polyurethane molded sampling bottle membrane sleeve, the valve on the panel can be switched from the sampling position to the closed position. During the entire sampling process, the nitrogen self-regulating valve 9 can automatically regulate the pressure fluctuation during sampling, so that the pressure is stabilized within the range of 0.1-0.3 MPa. Since the conversion rate of the monomers styrene and acrylonitrile of the polymer polyol in the reaction process does not reach 100%, during the sampling process, the unreacted monomers (styrene and acrylonitrile) will be adsorbed by the multi-stage activated carbon adsorption system 13 after the tail gas absorption line 401, and will not be inhaled by the operator.

[0027] Step 5: The operator opens the side door of the sealed sampling chamber 7, removes the 250ml / 500ml sampling bottle from the threaded interface, and screws on the cap. The sampling process is complete; close the nitrogen hand valve 10.

[0028] The above embodiments merely illustrate the implementation of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model.

Claims

1. An energy-saving polymer polyol sampling device, comprising a sealed sampling chamber (7) with a transparent viewing window and a side door, characterized in that: The sealed sampling chamber (7) is equipped with a medium feed line (102), which is connected to a medium discharge line (101). A sampling tube (14) is connected to the connection between the medium discharge line (101) and the medium feed line (102). The sampling tube (14) is connected to a nitrogen purging line (301). The sampling port of the sampling tube (14) is provided with a threaded interface that matches the sampling bottle (5). The sampling bottle (5) is covered with a polyurethane molded sampling bottle film sleeve (6). The sealed sampling chamber (7) is also connected to a tail gas absorption line (401).

2. The energy-efficient polymer polyol sampling device of claim 1, wherein: The medium feed line (102) is equipped with a valve C (1-3) at one end near the medium discharge line (101), the medium discharge line (101) is equipped with a valve B (1-2) at one end near the valve C (1-3), and the sampling tube (14) is equipped with a valve A (1-1) at one end near the valve B (1-2).

3. The energy-efficient polymer polyol sampling device of claim 1, wherein: One end of the medium discharge pipeline (101) is provided with a medium outlet (1).

4. The energy-efficient polymer polyol sampling device of claim 1, wherein: One end of the medium feed line (102) is provided with a medium inlet (2), and a thermometer (12) is installed on the medium feed line (102).

5. The energy-efficient polymer polyol sampling device of claim 1, wherein: One end of the nitrogen purging line (301) is provided with a nitrogen purging port (3), and the nitrogen purging line (301) is equipped with a nitrogen line check valve (8), a nitrogen self-regulating valve (9), a nitrogen manual valve (10) and a pressure gauge (11).

6. The energy-efficient polymer polyol sampling device of claim 1, wherein: One end of the exhaust gas absorption pipeline (401) is provided with a vent (4), and a multi-stage activated carbon adsorption system (13) is installed on the exhaust gas absorption pipeline (401).

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