A polymerizer washing and draining detection system

Abstract

The utility model discloses a kind of polymerizer flushing drainage detection systems, belong to chemical equipment detection field.The system includes polymerizer ontology, wastewater collection tank, both are connected by pipeline and first electric control valve is equipped on pipeline, still include drainage detection device, second electric control valve, waste gas collection assembly and flushing inlet pipe.Drainage detection device contains jar body, inlet pipe, flow switch and drain pipe, drain pipe is inverted U type;Waste gas collection assembly is made of gas cabinet and fourth electric control valve.Judge drainage condition by flow switch monitoring drainage flow, prevent waste gas from escaping using specially designed drain pipe, and collect toxic gas by waste gas collection assembly.In chemical PVC production, the system is used to solve that whether drainage is drained out accurately when polymerizer flushing drainage, and harmful gas cannot be effectively collected.

Description

Technical Field

[0001] This utility model belongs to the field of PVC production technology, specifically relating to a polymerization reactor flushing and drainage detection system. Background Technology

[0002] The chemical PVC production process uses vinyl chloride as a raw material, demineralized water as a suspension medium, and adds various additives such as dispersants and initiators. Under specific pressure and temperature conditions, and with stirring at a certain speed, the reaction is promoted to produce polyvinyl chloride resin.

[0003] Before each feeding into the polymerization reactor, a crucial step is to evenly spray an anti-sticking agent (reactor coating agent) onto the inner surface of the reactor. This step aims to prevent scale buildup on the reactor walls during production, thereby ensuring the smooth progress of the polymerization reaction and guaranteeing product quality.

[0004] However, after the coating agent is applied, in order to create an absolutely clean environment for the polymerization reaction and thus ensure the stable quality of the resin product and controllable impurity levels after the reaction, it is necessary to thoroughly rinse the inside of the polymerization reactor and related pipelines with deionized water to remove residual coating agent.

[0005] In actual production, existing technologies have revealed numerous problems. First, there is a lack of accurate and timely methods for assessing the drainage status of wastewater after rinsing. Operators cannot definitively know whether rinsing is thorough or whether the wastewater has been completely drained. This uncertainty can lead to the polymerization reactor entering the next production stage without completely draining the wastewater, affecting the polymerization reaction's effectiveness, thereby reducing the utilization rate of the polymerization reactor equipment and increasing production costs.

[0006] Secondly, during the drainage process, toxic hydrogen chloride gas may be released again from the polymerization reactor, along with toxic gases from unreacted vinyl chloride monomer. If these toxic gases are not effectively collected, they will not only cause serious pollution to the production environment and threaten the health of operators, but may also pose safety hazards, failing to meet the environmental protection and safety requirements of chemical production.

[0007] In summary, existing methods for flushing and draining polymerization reactors have significant shortcomings in terms of wastewater discharge assessment and harmful gas collection. There is an urgent need to develop a new detection system for flushing and draining polymerization reactors to solve the above-mentioned technical problems and improve the quality, efficiency, and safety of PVC production in the chemical industry. Utility Model Content

[0008] The purpose of this invention is to provide a polymerization reactor flushing drainage detection system to solve the technical problems of not being able to effectively determine whether the flushing drainage has been completely discharged and not being able to effectively collect harmful gases.

[0009] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A polymerization reactor flushing and drainage detection system includes a polymerization reactor body, a wastewater collection tank connected to the bottom of the polymerization reactor body via a pipeline, and a first electrically controlled valve installed on the aforementioned pipeline. The system also includes a drainage detection device connected to the pipeline between the first electrically controlled valve and the wastewater collection tank, a second electrically controlled valve connected to the pipeline between the drainage detection device and the first electrically controlled valve, and a waste gas collection assembly connected to the drainage detection device; a flushing inlet pipe is connected to the pipeline between the first electrically controlled valve and the second electrically controlled valve.

[0010] Furthermore, the drainage detection device includes a tank, an inlet pipe located in the upper part of the tank, a flow switch located on the inlet pipe, and a drain pipe located at the bottom of the tank; the drain pipe is generally in the shape of an inverted U, and the U-shaped bend is slightly higher than the inlet of the drain pipe.

[0011] Furthermore, a third electrically controlled valve is installed on the pipeline between the drain pipe and the wastewater collection tank.

[0012] Furthermore, the exhaust gas collection assembly includes a gas holder connected to the top of the tank via a pipeline and a fourth electrically controlled valve installed on the pipeline.

[0013] Compared with the prior art, the beneficial effects of this utility model are: Firstly, regarding drainage detection, the real-time monitoring of wastewater flow via the flow switch in the drainage detection device allows for accurate determination of whether flushing and drainage are thorough. Compared to traditional methods relying solely on experience, this significantly improves accuracy, avoids issues such as incomplete drainage affecting the utilization rate of the polymerization reactor, thereby increasing production efficiency and reducing production costs.

[0014] Secondly, regarding waste gas treatment, the waste gas collection system can effectively collect toxic gases such as hydrogen chloride and unreacted vinyl chloride monomer that are volatilized again in the polymerization reactor during drainage. This not only reduces the pollution of the production environment by toxic gases and protects the health of operators, but also meets environmental protection requirements. At the same time, it enables the recovery and reuse of some valuable gases, improving resource utilization. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the system control of this utility model.

[0016] Among them, 1-polymerization reactor body; 2-wastewater collection tank; 3-rinsing water inlet pipe; 4-first electric control valve; 5-second electric control valve; 6-third electric control valve; 7-tank body; 8-liquid inlet pipe; 9-flow switch; 10-liquid drain pipe; 11-gas holder; 12-fourth electric control valve. Detailed Implementation

[0017] The preferred embodiments of this utility model will be described below with reference to the accompanying drawings.

[0018] like Figure 1 As shown, this polymerization reactor flushing and drainage detection system mainly consists of a polymerization reactor body 1, a wastewater collection tank 2, multiple electrically controlled valves, a drainage detection device, a flushing water inlet pipe 3, and a waste gas collection component. The various parts work closely together to achieve accurate detection and control of the polymerization reactor flushing and drainage, as well as effective collection of harmful gases.

[0019] As the core equipment for the PVC polymerization reaction, the polymerization reactor body 1 needs to be rinsed after the anti-sticking agent is applied. This rinsing includes rinsing the condenser at the top of the reactor and rinsing the reactor body, controlled by a rinsing system. The bottom of the polymerization reactor body 1 is connected in sequence to a first electrically controlled valve 4, a second electrically controlled valve 5, a drainage detection device, and a third electrically controlled valve 6 via pipelines, ultimately leading to the wastewater collection tank 2. A rinsing inlet pipe 3 is connected to the pipeline between the first electrically controlled valve 4 and the second electrically controlled valve 5. This rinsing inlet pipe 3 is a pipeline in the existing rinsing system, used for rinsing the bottom pipelines, and is a rinsing branch within the entire rinsing system.

[0020] The drainage detection device includes a tank 7, an inlet pipe 8, a flow switch 9, and a drain pipe 10. The inlet pipe 8 is located in the upper part of the tank 7. The flow switch 9 is installed on the inlet pipe 8 and monitors the wastewater flow rate in real time, converting the flow information into an electrical signal that is transmitted to the system control unit. The system control unit can be a PC device in the central control room of the production system. The drain pipe 10 is located at the bottom of the tank 7 and is shaped like an inverted U, with the U-shaped bend slightly higher than the inlet of the drain pipe 10. After the wastewater flows into the tank 7, due to the special design of the drain pipe 10, a water seal is formed at the U-shaped bend, preventing any toxic gases that may be generated inside the tank from escaping from the drain pipe 10.

[0021] Drainage control is primarily achieved through the first electrically controlled valve 4, the second electrically controlled valve 5, the third electrically controlled valve 6, and the system control unit. The control unit makes judgments based on data feedback from the flow switch 9. If the flow rate is higher than the preset lower limit, it indicates that the wastewater has not been completely drained, and the control unit keeps the third electrically controlled valve 6 open, continuously monitoring the flow rate. When the flow rate is lower than the preset lower limit and remains so for a certain period of time (e.g., 1 minute, which can be adjusted according to actual conditions), the control unit determines that drainage is basically complete and issues a closing command to the third electrically controlled valve 6. After the third electrically controlled valve 6 opens, the wastewater in the tank 7 flows into the wastewater collection tank 2 through the drain pipe 10 under the action of gravity. The system control unit can be implemented using equipment in a central control room, or through an independent control console or controller.

[0022] The waste gas collection assembly consists of a gas holder 11 and a fourth electrically controlled valve 12. The gas holder 11 can be replaced by a waste gas buffer tank. The gas holder 11 is connected to the top of the drainage detection device tank 7 via a pipeline, and the fourth electrically controlled valve 12 is installed on this pipeline. Simultaneously with the flushing wastewater entering the tank 7, if residual hydrogen chloride and unreacted vinyl chloride monomer, or other toxic gases, evaporate to the top of the tank 7, the control unit opens the fourth electrically controlled valve 12. Under pressure differential, the toxic gases enter the gas holder 11 through the pipeline. The gas holder 11 collects and stores the toxic gases for subsequent centralized treatment. For example, hydrogen chloride gas can be recovered and reused through chemical processes, and vinyl chloride monomer gas can be purified and reused in the polymerization reaction.

[0023] Throughout the entire flushing and drainage testing process, each electrically controlled valve (electric valve) is precisely controlled by the system control unit based on the feedback data from the flow switch 9 and the preset logic program, thus achieving automated operation.

[0024] In the production of PVC in the chemical industry, after the polymerization reactor is coated with an anti-sticking agent, the system initiates a flushing process. Demineralized water flows into the polymerization reactor body 1 from the flushing inlet pipe 3, flushing its interior and converting residual coating agent into wastewater. After flushing, the wastewater is sequentially tested by a drainage detection device to determine if the drainage is complete, and finally discharged into the wastewater collection tank 2. Simultaneously, if any waste gas is generated, the waste gas collection assembly collects it into the gas holder 11. The entire process is automated through precise control of each electrically controlled valve by the system control unit. During drainage, the first electrically controlled valve 4 is activated, and based on system control, the second, third, and fourth electrically controlled valves 5, 6, and 12 open synchronously. When the first electrically controlled valve 4 is closed, the fourth electrically controlled valve 12 remains closed. When the first electrically controlled valve 4 is closed, the second and fourth electrically controlled valves 5 and 12 are opened, allowing the flushing inlet pipe 3 to flush the pipeline, and the corresponding valves are then closed after flushing.

Claims

1. A polymerization reactor flushing and drainage detection system, comprising a polymerization reactor body, a wastewater collection tank connected to the bottom of the polymerization reactor body via a pipeline, and a first electrically controlled valve disposed on the aforementioned pipeline, characterized in that, It also includes a drainage detection device connected to the pipeline between the first solenoid valve and the wastewater collection tank, a second solenoid valve connected to the pipeline between the drainage detection device and the first solenoid valve, and a waste gas collection assembly connected to the drainage detection device; a flushing inlet pipe is connected to the pipeline between the first solenoid valve and the second solenoid valve.

2. The drainage detection system as described in claim 1, characterized in that, The drainage detection device includes a tank, an inlet pipe located in the upper part of the tank, a flow switch located on the inlet pipe, and a drain pipe located at the bottom of the tank; the drain pipe is in the shape of an inverted U, and the curved part of the U is slightly higher than the inlet of the drain pipe.

3. The drainage detection system as described in claim 2, characterized in that, A third electrically controlled valve is installed on the pipeline between the drain pipe and the wastewater collection tank.

4. The drainage detection system as described in claim 2, characterized in that, The exhaust gas collection assembly includes a gas holder connected to the top of the tank via a pipeline and a fourth electrically controlled valve installed on the pipeline.

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