A sampling and processing device suitable for on-line analysis of saponification residual liquid of propylene oxide plant

Abstract

The utility model relates to saponification residual liquid sampling equipment technical field, concretely to a kind of sampling treatment device suitable for saponification residual liquid on-line analysis instrument of propylene oxide device, including inclined plate sedimentation water tank, liquid storage tank and PLC control panel, it is characterized in that;Inclined plate sedimentation water tank is used to carry out precipitation to saponification liquid sample, and inclined plate sedimentation water tank is equipped with sample inlet, blow-off port and overflow port;Liquid storage tank is used to store sample after being treated by inclined plate sedimentation water tank.This sampling treatment device suitable for saponification residual liquid on-line analysis instrument of propylene oxide device, the oblique parallel inclined plate being arranged in the inclined plate sedimentation water tank, using the "shallow layer precipitation principle", substantially increase sedimentation area, shorten particle sedimentation distance, accelerate impurity sedimentation speed.Simultaneously, sample inlet valve opening is greater than blow-off port valve opening, cooperate bottom sampling design, make liquid in water tank keep specific flow rate and liquid level difference, ensure supernatant to flow out from overflow port stably.

Description

Technical Field

[0001] This utility model relates to the technical field of saponification residue sampling equipment, specifically, to a sampling and processing device suitable for online analysis instruments of saponification residue in propylene oxide plants. Background Technology

[0002] In the production of propylene oxide, the saponification residue has a complex composition and significantly impacts the stability and environmental friendliness of the production system. Accurate analysis of the saponification residue's composition is crucial for optimizing production processes, improving product quality, and reducing environmental pollution. Currently, existing methods for sampling and processing saponification residues have several shortcomings. Traditional sampling devices struggle to effectively remove impurities and suspended solids from the residue, leading to inaccurate analytical results and hindering precise control over the production process. For example, the patent CN222989802U, entitled "An Online Detection Instrument Waste Liquid Reduction Treatment Device," primarily focuses on improving the efficiency of the sedimentation process of suspended solids in waste liquid. Through a specific structural design, such as an electric actuator driving a first mesh plate and a push rod, it effectively collects the settled suspended solids in the sedimentation tank. However, this device's application scenario focuses on general online detection instrument waste liquid, which differs significantly from the characteristics of saponification residue from propylene oxide plants. Propylene oxide plant saponification residue is characterized by high temperature, high alkalinity, and a more complex composition, containing not only suspended solids but also various organic and inorganic impurities. Existing general-purpose waste liquid treatment devices of this type cannot be directly applied to the online analysis and sampling of saponification residue. Their structure and function cannot meet the requirements for sufficient sedimentation, accurate sampling, and adaptation to complex process requirements. They cannot guarantee the provision of pure, stable, and representative samples for subsequent analytical instruments, thus hindering efficient and accurate analysis of propylene oxide plant saponification residue and failing to provide reliable data support for optimizing production processes and ensuring production safety. Utility Model Content

[0003] The purpose of this invention is to provide a sampling and processing device suitable for online analysis instruments of saponification residue in propylene oxide plants, so as to solve the problem mentioned in the background art that traditional sampling devices are difficult to effectively remove impurities and suspended solids in the residue, resulting in inaccurate analysis results and affecting the precise control of the production process.

[0004] To achieve the above objectives, this utility model provides a sampling and processing device suitable for online analysis instruments of saponification residue in propylene oxide plants, comprising an inclined plate sedimentation tank, a storage tank, and a PLC control board. The device is characterized in that: the inclined plate sedimentation tank is used to precipitate the saponification liquid sample, and is equipped with an inlet, a drain outlet, and an overflow outlet; the storage tank is used to store the sample processed by the inclined plate sedimentation tank; the turbid sediment at the bottom of the inclined plate sedimentation tank is discharged to the storage tank through the drain outlet, and the supernatant from the overflow outlet is also discharged into the storage tank; when the liquid level reaches a high level, the PLC control board controls the instrument solenoid valve to aerate and mix the storage tank; after 1 minute of aeration, the instrument solenoid valve closes, and the PLC control board controls the explosion-proof electric pump to start and transport the residual liquid sample in the storage tank to the pipeline return point; when the liquid level reaches a low level, the explosion-proof electric pump stops operating.

[0005] This setup uses an inclined plate sedimentation tank to precipitate and separate the saponified liquid sample. The sample is introduced through the inlet, and the turbid precipitate at the bottom is discharged through the drain outlet, while the supernatant flows into the storage tank through the overflow outlet. The liquid level in the storage tank is monitored by a PLC control board. When the liquid level reaches a high level, the PLC control board opens the instrument air solenoid valve to aerate and mix the liquid in the storage tank, resuspending the precipitated impurities. After uniform mixing, the solenoid valve is closed, and the explosion-proof electric pump is started to transport the residual sample to the pipeline return point. When the liquid level drops to a low level, the explosion-proof electric pump stops operating. This process achieves automated control of sample precipitation, mixing, and recovery.

[0006] Preferably, the valve opening of the inlet is greater than that of the drain valve to ensure that the supernatant in the inclined plate sedimentation tank flows out from the upper overflow port.

[0007] This method involves setting the inlet valve opening to be larger than the outlet valve opening, so that the liquid in the inclined plate sedimentation tank maintains a certain flow rate and liquid level difference. As the sample continuously enters the tank, gravity and water flow accelerate the precipitation of impurities in the saponification residue, while ensuring that the supernatant can flow out smoothly from the top overflow port.

[0008] Preferably, the liquid storage tank is equipped with a float level gauge, which outputs a signal to the PLC control board based on the liquid level. The instrument solenoid valve is controlled by the PLC control board to open and close, and the explosion-proof electric pump is controlled by the PLC control board to achieve automatic start and stop. The PLC control board is used to control the opening and closing of the instrument solenoid valve and the start and stop of the explosion-proof electric pump based on the signal output by the float level gauge.

[0009] This system uses a float level gauge in the storage tank to monitor the liquid level in real time and transmits the signal to the PLC control board. Based on the received signal, the PLC control board controls the opening and closing of the instrument air solenoid valve and the start and stop of the explosion-proof electric pump. When the liquid level rises to the high level, the PLC control board opens the solenoid valve to perform aeration and mixing. After mixing is complete, the solenoid valve closes, and the explosion-proof electric pump starts. When the liquid level drops to the low level, the PLC control board stops the explosion-proof electric pump, forming a closed-loop automatic control system.

[0010] Preferably, the inclined plate sedimentation tank has several parallel inclined plates inside, and a sampling port is provided on the upper side of the inclined plate sedimentation tank.

[0011] This feature incorporates several parallel inclined plates inside the inclined plate sedimentation tank, increasing the sedimentation area. Utilizing the "shallow sedimentation principle," it shortens the particle settling distance, accelerates the sedimentation rate, and allows impurities to settle to the bottom of the tank more quickly. A sampling port on the upper side facilitates sample extraction from the supernatant area after sedimentation.

[0012] Preferably, the system also includes an analyzer, the sampling end of which is connected to the sampling port of the storage tank, and the supernatant is filtered and cooled before being transported to the analyzer by a peristaltic pump.

[0013] This setup connects the analyzer's sampling end to the sampling port of the storage tank, obtaining the supernatant sample after precipitation treatment from the storage tank. The supernatant is then filtered to remove residual minute impurities, cooled to meet the analyzer's detection requirements, and finally, a peristaltic pump stably delivers the treated sample to the analyzer for component analysis.

[0014] Preferably, a one-way valve is installed on the outer end of the sampling port pipeline. The one-way valve is used to ensure the one-way flow of liquid and prevent liquid backflow.

[0015] This feature involves installing a check valve on the external pipeline of the sampling port. Utilizing the one-way flow characteristic of the check valve, it allows liquid to flow only from the storage tank towards the analyzer, preventing backflow. When the system pressure changes or the pump stops working, the check valve automatically closes to prevent liquid from flowing back into the storage tank, thus avoiding sample contamination and pipeline blockage.

[0016] Preferably, two explosion-proof electric pumps are configured, and the two explosion-proof electric pumps are controlled by a PLC control board to operate alternately.

[0017] This setup includes two explosion-proof electric pumps, controlled by a PLC control board that operates the two pumps alternately. When one pump is working, the other is in standby mode. When the working pump reaches a certain operating time or malfunctions, the PLC control board automatically switches to the other pump to ensure continuous and uninterrupted liquid delivery.

[0018] Preferably, the inlet of the inclined plate sedimentation tank is located at the bottom, so that the sample is continuously injected from the bottom of the inclined plate sedimentation tank, and the supernatant of the sample after sedimentation is discharged to the storage tank through the overflow port.

[0019] This design places the inlet of the inclined plate sedimentation tank at the bottom, allowing the sample to enter continuously from the bottom. As the sample flows upward, impurities gradually settle to the bottom of the tank under the influence of gravity and the inclined plate, while the supernatant is discharged into the storage tank through the overflow outlet at the top. This bottom-injection method ensures that the sample has sufficient sedimentation time and space within the tank.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows: The sampling and processing device for the online analysis instrument of saponification residue in a propylene oxide plant features inclined parallel plates inside the inclined plate sedimentation tank. Utilizing the "shallow sedimentation principle," this significantly increases the sedimentation area, shortens the particle settling distance, and accelerates the settling speed of impurities. Simultaneously, the inlet valve opening is larger than the outlet valve opening, and combined with the bottom injection design, this maintains a specific flow rate and level difference within the tank, ensuring a stable outflow of supernatant from the overflow port. This design effectively achieves efficient separation of impurities from the supernatant in the saponification residue, providing a pure, stable, and representative sample for subsequent analysis. It solves the problem of traditional devices struggling to remove impurities and suspended solids, significantly improving the accuracy of analytical results and providing reliable data support for production process optimization. The storage tank is equipped with a float level gauge to monitor the liquid level in real time, which is linked with the PLC control board to achieve automated control of the instrument solenoid valve and explosion-proof electric pump. When the liquid level reaches a high level, automatic aeration and mixing are activated to ensure uniform liquid composition before the residual liquid is transported to the pipeline return point. When the liquid level is low, the pump stops operating to ensure the accuracy and stability of liquid processing within the storage tank. Simultaneously, the analyzer uses a peristaltic pump to obtain the filtered and cooled supernatant from the sampling port of the storage tank. A one-way valve prevents backflow, ensuring safe and stable sample transport. The entire system achieves fully automated control from sampling to analysis, reducing manual intervention, avoiding human error, ensuring reliable analytical data, and meeting the requirements for accurate analysis of saponification residue components in the propylene oxide production process. Two explosion-proof electric pumps are controlled by a PLC control board to operate alternately. When one pump is working, the other is on standby. Automatic switching occurs in case of malfunction or when the operating time is reached, ensuring uninterrupted liquid delivery and resolving the issue of sample injection stopping due to maintenance or failure of a single pump. This ensures a continuous and stable sample recovery process. This design extends the service life of individual pumps and reduces equipment replacement frequency. Simultaneously, the automated control reduces manual cleaning, unclogging, sampling, and testing operations, lowering labor costs. Furthermore, the precise sedimentation and sampling design reduces the risk of pipeline blockage, lowers equipment maintenance difficulty and costs, and improves the overall operating efficiency and economy of the device. The device collects the turbid precipitate from the bottom of the inclined plate sedimentation tank and the supernatant from the overflow outlet into a storage tank. Aeration and mixing, controlled by a PLC control panel and transported by an explosion-proof electric pump, return the residual liquid sample to the pipeline, achieving sample recycling and preventing indiscriminate discharge into on-site ditches. This meets environmental protection requirements and reduces the risk of environmental pollution. Simultaneously, the recycling process is closely integrated with the sampling and analysis process, ensuring the continuity and stability of the production process and meeting the environmental protection and production process requirements of the propylene oxide unit for saponification residue treatment. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the inclined plate sedimentation tank in this utility model; Figure 3 This is a schematic diagram of the liquid storage tank in this utility model; The meanings of the labels in the diagram are as follows: 1. Inclined plate sedimentation tank; 11. Sample inlet; 12. Drain outlet; 13. Overflow outlet; 14. Sampling port; 15. Inclined plate; 2. Storage tank; 3. Float level gauge; 4. PLC control board; 5. Instrument solenoid valve; 6. Explosion-proof electric pump; 7. Check valve; 8. Analyzer; 9. Peristaltic pump. Detailed Implementation

[0022] 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.

[0023] This invention provides a sampling and processing device suitable for online analysis instruments of saponification residue in propylene oxide plants, such as... Figure 1 , Figure 2 , Figure 3As shown, the system includes an inclined plate sedimentation tank 1, a storage tank 2, and a PLC control board 4. The inclined plate sedimentation tank 1 is used to precipitate saponified liquid samples. The inclined plate sedimentation tank 1 has an inlet 11, a drain 12, and an overflow 13. The storage tank 2 is used to store the samples treated by the inclined plate sedimentation tank 1. The turbid sediment at the bottom of the inclined plate sedimentation tank 1 is discharged to the storage tank 2 through the drain 12, and the supernatant from the overflow 13 is also discharged into the storage tank 2. When the liquid level reaches a high level, the PLC control board 4 controls the instrument solenoid valve 5 to aerate and mix the storage tank 2. After 1 minute of aeration, the instrument solenoid valve 5 closes, and the PLC control board 4 controls the explosion-proof electric pump 6 to start and transport the residual liquid sample in the storage tank 2 to the pipeline return point. When the liquid level reaches a low level, the explosion-proof electric pump 6 stops operating.

[0024] The saponification liquid sample is precipitated and separated using an inclined plate sedimentation tank 1. The sample is introduced through the inlet 11, and the turbid precipitate at the bottom is discharged through the drain 12. The supernatant flows into the storage tank 2 through the overflow 13. The liquid level in the storage tank 2 is monitored by a PLC control board 4. When the liquid level reaches a high level, the PLC control board 4 controls the instrument air solenoid valve 5 to open, aerating and mixing the liquid in the storage tank 2 to resuspend the precipitated impurities. After uniform mixing, the solenoid valve 5 is closed, and the explosion-proof electric pump 6 is started to transport the residual liquid sample to the pipeline return point. When the liquid level drops to a low level, the explosion-proof electric pump 6 stops operating. This process achieves automated control of sample precipitation, mixing, and recovery. It solves the problem of difficult handling of impurity precipitation during saponification residual liquid sampling, achieves effective sample separation and recovery, avoids random sample discharge, and reduces manual intervention through automated control, improving processing efficiency and system stability.

[0025] In this embodiment, the valve opening of the inlet 11 is greater than the valve opening of the outlet 12 to ensure that the supernatant in the inclined plate sedimentation tank 1 flows out from the upper overflow outlet 13.

[0026] By setting the opening of the inlet valve 11 to be greater than that of the outlet valve 12, a certain flow rate and liquid level difference are maintained in the inclined plate sedimentation tank 1. As the sample continuously enters the tank 1, gravity and the propulsion of the water flow accelerate the precipitation of impurities in the saponification residue, while ensuring that the supernatant can flow smoothly out from the overflow port 13 at the top. This ensures that the inclined plate sedimentation tank 1 can stably output supernatant, providing high-quality samples for subsequent analyzers, improving sample purity, and thus enhancing the accuracy and reliability of analytical results, which helps to more accurately analyze the composition of the saponification residue.

[0027] Specifically, such as Figure 1 , Figure 3As shown, the liquid storage tank 2 is equipped with a float level gauge 3. The float level gauge 3 is used to output signals to the PLC control board 4 according to the liquid level. The instrument air solenoid valve 5 is controlled by the PLC control board 4 to open and close. The explosion-proof electric pump 6 is controlled by the PLC control board 4 to realize automatic start and stop. The PLC control board 4 is used to control the opening and closing of the instrument air solenoid valve 5 and the start and stop of the explosion-proof electric pump 6 according to the signals output by the float level gauge 3.

[0028] The float level gauge 3 in the liquid storage tank 2 monitors the liquid level in real time and transmits the signal to the PLC control board 4. Based on the received signal, the PLC control board 4 controls the opening and closing of the instrument air solenoid valve 5 and the start and stop of the explosion-proof electric pump 6. When the liquid level rises to the high level, the PLC control board 4 controls the solenoid valve 5 to open for aeration and mixing. After mixing is complete, the solenoid valve 5 is closed, and the explosion-proof electric pump 6 is started. When the liquid level drops to the low level, the PLC control board 4 controls the explosion-proof electric pump 6 to stop running, forming a closed-loop automatic control system. This achieves intelligent and automated liquid handling within the liquid storage tank 2, eliminating the need for real-time manual monitoring. It can automatically execute corresponding operations based on liquid level changes, ensuring stable operation of the sample recovery process, improving system reliability and operating efficiency, and saving labor costs.

[0029] Furthermore, such as Figure 2 As shown, the interior of the inclined plate sedimentation tank 1 is provided with several parallel inclined plates 15, and a sampling port 14 is provided on the upper side of the inclined plate sedimentation tank 1.

[0030] Several parallel inclined plates 15 are installed inside the inclined plate sedimentation tank 1, increasing the sedimentation area. Utilizing the "shallow sedimentation principle," the particle settling distance is shortened, accelerating the sedimentation speed and allowing impurities to settle to the bottom of the tank 1 more quickly. A sampling port 14 is located on the upper side, facilitating sample extraction from the supernatant area after sedimentation. This significantly improves the sedimentation efficiency of the saponification residue, enabling faster and more effective separation of the supernatant, providing ample high-quality samples for subsequent analysis. Furthermore, the well-designed sampling port 14 ensures that the sample taken is the supernatant, further improving the quality of the analytical sample and the accuracy of the analytical results.

[0031] Furthermore, such as Figure 1 As shown, it also includes an analyzer 8. The sampling end of the analyzer 8 is connected to the sampling port 14 of the storage tank 2. The supernatant is filtered and cooled before being transported to the analyzer 8 by a peristaltic pump 9.

[0032] The sampling end of analyzer 8 is connected to the sampling port 14 of storage tank 2, and the supernatant sample after precipitation treatment is obtained from storage tank 2. The supernatant is filtered to remove residual minute impurities, then cooled to ensure the sample temperature meets the detection requirements of analyzer 8. Finally, peristaltic pump 9 stably delivers the processed sample to analyzer 8 for component analysis. This ensures the quality of the sample entering analyzer 8. Filtration and cooling processes avoid interference from impurities and temperature on the analytical results, enabling analyzer 8 to accurately detect various parameters of saponification residue, providing reliable data support for the optimization and quality control of propylene oxide production processes.

[0033] Furthermore, such as Figure 1 As shown, a one-way valve 7 is installed on the outer end of the sampling port 14. The one-way valve 7 is used to ensure the one-way flow of liquid and prevent liquid backflow.

[0034] A one-way valve 7 is installed on the outer end of the pipeline at sampling port 14. Utilizing the one-way flow characteristic of the one-way valve 7, liquid is allowed to flow only from the storage tank 2 towards the analyzer 8, preventing backflow. When the system pressure changes or the pump stops working, the one-way valve 7 automatically closes, preventing liquid from flowing back into the storage tank 2 and avoiding sample contamination and pipeline blockage. This ensures the stability and safety of the entire sampling and delivery process, prevents cross-contamination of samples due to liquid backflow, ensures the accuracy and reliability of sample analysis, avoids the risk of pipeline blockage, and reduces equipment maintenance costs and the probability of malfunction.

[0035] Furthermore, such as Figure 1 As shown, two explosion-proof electric pumps 6 are configured, and the two explosion-proof electric pumps 6 are controlled by PLC control board 4 to operate alternately.

[0036] Two explosion-proof electric pumps (6) are configured, and the two pumps operate alternately under the control of a PLC control board (4). When one pump is working, the other is in standby mode. When the working pump reaches a certain operating time or fails, the PLC control board (4) automatically switches to the other pump, achieving continuous and uninterrupted liquid delivery. This solves the problem of sample delivery stopping when a single pump is under maintenance or malfunctions, ensuring the continuity of the sample recovery process and improving the reliability and stability of the system. At the same time, the alternating operation of the two pumps distributes the workload, extends the service life of a single pump, and reduces equipment replacement costs and maintenance frequency.

[0037] Furthermore, such as Figure 1 As shown, the inlet 11 of the inclined plate sedimentation tank 1 is located at the bottom, so that the sample is continuously injected from the bottom of the inclined plate sedimentation tank 1, and the supernatant of the sample after sedimentation is discharged to the storage tank 2 through the overflow port 13.

[0038] The inlet 11 of the inclined plate sedimentation tank 1 is located at the bottom, allowing the sample to continuously enter from the bottom of the tank. During the upward flow, impurities gradually settle to the bottom of the tank under the influence of gravity and the inclined plate 15, while the supernatant is discharged from the overflow port 13 at the top into the storage tank 2. This bottom-injection method ensures sufficient sedimentation time and space for the sample within the tank 1. It achieves continuous and stable sample collection, avoiding clogging of the sampling tube due to sample sedimentation during intermittent sampling, and ensuring a smooth sampling process. Simultaneously, the bottom injection and top overflow effectively separate the supernatant, providing a stable and reliable sample source for subsequent analysis.

[0039] This utility model's sampling and processing device for online analysis of saponification residue in propylene oxide plants involves the following steps: First, the saponification residue continuously enters the water tank 1 through the inlet 11 at the bottom of the inclined plate sedimentation tank. Because the valve opening of the inlet 11 is greater than that of the drain 12, the liquid in the water tank 1 maintains a certain flow rate and level difference. Simultaneously, several parallel inclined plates 15 inside the water tank 1 utilize the "shallow sedimentation principle" to increase the sedimentation area and shorten the particle sedimentation distance. During the upward flow of the sample, impurities rapidly settle to the bottom of the water tank 1 under the influence of gravity and the inclined plates 15. The supernatant after sedimentation is discharged from the overflow 13 at the top and flows into the storage tank 2. The turbid precipitate at the bottom is also discharged into the storage tank 2 through the drain 12, achieving preliminary solid-liquid separation and sedimentation of the sample. Storage tank 2 collects the supernatant and turbid precipitate from inclined plate sedimentation tank 1. A float level gauge 3 in storage tank 2 monitors the liquid level in real time and transmits the signal to PLC control board 4. When the liquid level rises to the high level, PLC control board 4 controls the instrument air solenoid valve 5 to open, aerating and mixing the liquid in storage tank 2 for 1 minute to resuspend the precipitated impurities and ensure uniform liquid composition. After aeration, PLC control board 4 closes the instrument air solenoid valve 5 and starts the explosion-proof electric pump 6 to transport the uniformly mixed residual liquid sample in storage tank 2 to the pipeline return point. When the liquid level drops to the low level, PLC control board 4 controls the explosion-proof electric pump 6 to stop operating, completing one liquid processing cycle. Meanwhile, the sampling end of analyzer 8 is connected to the sampling port 14 of storage tank 2, and the supernatant sample is obtained from storage tank 2. The obtained supernatant is first filtered to remove residual minute impurities, and then cooled to make the sample temperature meet the detection requirements of analyzer 8. Finally, the peristaltic pump 9 stably delivers the processed sample to analyzer 8 for saponification residual liquid composition analysis. A one-way valve 7 installed on the outer end of the pipeline of sampling port 14 uses its one-way conduction characteristic to ensure that the liquid can only flow from storage tank 2 to analyzer 8, preventing liquid backflow and ensuring a stable and safe sampling and delivery process. The two explosion-proof electric pumps 6 in the device are controlled alternately by a PLC control board 4. When one pump is working, the other is in standby mode. When the working pump reaches a certain operating time or malfunctions, the PLC control board 4 automatically switches to the other pump to ensure the continuity of liquid delivery, avoid sample injection stoppage due to maintenance or failure of a single pump, ensure uninterrupted sample recovery, extend the service life of individual pumps, and reduce equipment maintenance costs. Through the coordinated work of its components, the entire device achieves fully automated operation of the saponification residue from sampling, precipitation, treatment to analysis and recovery. This effectively solves the problems existing in traditional sampling and treatment methods, improves the accuracy and efficiency of saponification residue analysis in propylene oxide plants, and ensures the stability and environmental protection of the production process.

[0040] Finally, it should be noted that the PLC control board 4, instrument solenoid valve 5, etc. in this embodiment are all general standard parts or parts known to those skilled in the art. Their structure and principle can be learned by those skilled in the art through technical manuals or conventional experimental methods. In the idle part of this device, all the above-mentioned electrical components are connected by wires. The specific connection method should refer to the working order of each electrical component in the above working principle to complete the electrical connection. They are all technologies known in the art.

[0041] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A sampling and processing device for an online analysis instrument of saponification residue in a propylene oxide plant, comprising an inclined plate sedimentation tank (1), a storage tank (2), and a PLC control board (4), characterized in that; The inclined plate sedimentation tank (1) is used to precipitate the saponified liquid sample. The inclined plate sedimentation tank (1) is provided with an inlet (11), a drain (12) and an overflow (13). The storage tank (2) is used to store the sample after being treated by the inclined plate sedimentation tank (1). The turbid sediment at the bottom of the inclined plate sedimentation tank (1) is discharged to the storage tank (2) through the drain (12), and the supernatant from the overflow (13) is discharged into the storage tank (2). When the liquid level reaches the high level, the PLC control board (4) controls the instrument solenoid valve (5) to aerate and mix the storage tank (2). After aeration for 1 minute, the instrument solenoid valve (5) is closed, and the PLC control board (4) controls the explosion-proof electric pump (6) to start and transport the residual liquid sample in the storage tank (2) to the pipeline return point. When the liquid level reaches the low level, the explosion-proof electric pump (6) stops operating.

2. The sampling and processing device for online analysis instruments of saponification residue in propylene oxide plants according to claim 1, characterized in that: The valve opening of the inlet (11) is greater than that of the drain (12) valve to ensure that the supernatant in the inclined plate sedimentation tank (1) flows out from the upper overflow port (13).

3. The sampling and processing device for online analysis instruments of saponification residue in propylene oxide plants according to claim 1, characterized in that: The liquid storage tank (2) is equipped with a float level gauge (3). The float level gauge (3) is used to output a signal to the PLC control board (4) according to the liquid level. The instrument solenoid valve (5) is controlled by the PLC control board (4) to open and close. The explosion-proof electric pump (6) is controlled by the PLC control board (4) to realize automatic start and stop. The PLC control board (4) is used to control the opening and closing of the instrument solenoid valve (5) and the start and stop of the explosion-proof electric pump (6) according to the signal output by the float level gauge (3).

4. The sampling and processing device for online analysis instruments of saponification residue in propylene oxide plants according to claim 1, characterized in that: The inclined plate sedimentation tank (1) is provided with several parallel inclined plates (15) inside, and a sampling port (14) is provided on one side of the upper part of the inclined plate sedimentation tank (1).

5. The sampling and processing device for online analysis instruments of saponification residue in propylene oxide plants according to claim 4, characterized in that: It also includes an analyzer (8), the sampling end of which is connected to the sampling port (14) of the storage tank (2). The supernatant is filtered and cooled before being transported to the analyzer (8) by a peristaltic pump (9).

6. The sampling and processing device for online analysis instruments of saponification residue in propylene oxide plants according to claim 4, characterized in that: A one-way valve (7) is installed on the outer end of the sampling port (14). The one-way valve (7) is used to ensure the one-way flow of liquid and prevent liquid backflow.

7. The sampling and processing device for online analysis instruments of saponification residue in propylene oxide plants according to claim 1, characterized in that: Two explosion-proof electric pumps (6) are configured, and the two explosion-proof electric pumps (6) are controlled by a PLC control board (4) to run alternately.

8. The sampling and processing device for online analysis instruments of saponification residue in propylene oxide plants according to claim 1, characterized in that: The inlet (11) of the inclined plate sedimentation tank (1) is located at the bottom, so that the sample is continuously injected from the bottom of the inclined plate sedimentation tank (1), and the supernatant of the sample after sedimentation is discharged to the storage tank (2) through the overflow port (13).

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