Chlorine deep purification system and method based on low-temperature plasma concerted catalysis

Abstract

The invention relates to the technical field of gas purification, in particular to a chlorine gas deep purification system and method based on low-temperature plasma concerted catalysis, a first adsorption tower and a second adsorption tower are connected in parallel, and the top of the first adsorption tower and the top of the second adsorption tower are connected with a chlorine gas inlet pipe and a regenerated gas outlet pipe; the bottoms of the first adsorption tower and the second adsorption tower are connected with a chlorine gas outlet pipe and a regenerated gas inlet pipe; a gas outlet of the chlorine gas heater is connected with a gas inlet of the plasma generator, a gas outlet of the plasma generator is connected with the chlorine gas inlet pipe, the chlorine gas outlet pipe is connected with a gas inlet pipe of the chlorine gas cooler, and the regeneration gas inlet pipe is connected with the regeneration gas pipe. And the regenerated gas outlet pipe is connected with the waste gas incineration device. According to the invention, the preliminary dissociation efficiency of impurities is greatly improved, and the problem of shutdown caused by regeneration in the purification process of a traditional single adsorption tower is effectively avoided.

Description

Technical Field

[0001] This invention relates to the field of gas purification technology, specifically to a deep chlorine purification system and method based on low-temperature plasma synergistic catalysis. Background Technology

[0002] In the chlor-alkali chemical production process, chlorine is the core product, and its purity directly determines the quality of downstream products. The presence of impurities such as hydrogen, oxygen, hydrogen chloride, and volatile organic compounds (VOCs) can seriously affect the quality of chlorine. In recent years, with the rapid development of fields such as electronic-grade chemicals and high-end synthetic materials, the market's requirements for chlorine purity have become increasingly stringent, and traditional purification processes are no longer sufficient to meet the technological demands of the new era.

[0003] Current mainstream chlorine purification processes mainly include drying, liquefaction, distillation, chemical absorption, and physical adsorption. Among them, physical adsorption often uses adsorbents such as activated carbon and molecular sieves, but it has inherent drawbacks such as limited adsorption capacity, complex regeneration processes, and a tendency to generate secondary pollution. Chemical absorption faces problems such as lengthy processes and high energy consumption. Especially when treating trace amounts of insoluble impurities or low concentrations of organic impurities, it is difficult to improve the purity of chlorine to the electronic grade ultra-high purity standard, which restricts the application of chlorine in high-end fields.

[0004] To overcome the bottlenecks of traditional processes, low-temperature plasma technology has attracted widespread attention in the field of gas treatment due to its ability to generate high-energy electrons at room temperature and pressure, effectively breaking the chemical bonds of pollutants. In existing technologies, the combination of low-temperature plasma with catalysis / adsorption technologies is mostly focused on waste gas treatment in the environmental protection field. For example, Chinese patent CN103285719A discloses a method for treating chlorinated hydrocarbon-containing gases using low-temperature plasma. This method removes chlorinated hydrocarbons from waste gas through a combination of plasma oxidation and activated carbon adsorption, demonstrating the feasibility of plasma-assisted adsorption technology in gas purification.

[0005] However, existing plasma-assisted purification technologies all aim at the destructive degradation of harmful substances in environmental waste gas, rarely involving the deep purification of high-value chemical raw materials—chlorine. Directly applying the aforementioned waste gas treatment processes to chlorine purification scenarios exposes several key technical deficiencies: First, there is a lack of temperature-controlled pretreatment designed to address the strong oxidizing properties and specific molecular structure of chlorine. Conventional room-temperature plasma excitation efficiency is insufficient, making it difficult to achieve efficient removal of trace impurities and failing to meet electronic-grade purity requirements. Second, existing technologies, such as CN103285719A, mostly use carbon-based adsorbents. The strong oxidizing properties of chlorine cause carbon-based materials to be easily oxidized and degraded, reducing adsorbent durability and potentially introducing new impurities due to material decomposition, posing serious safety hazards. Third, existing systems lack intelligent control mechanisms based on real-time operating conditions, failing to accurately adjust operating status according to dynamic parameters such as chlorine flow rate, temperature, and impurity concentration. This results in poor production process stability and inaccurate energy consumption control, failing to meet the high-efficiency and energy-saving requirements of modern chemical engineering. Summary of the Invention

[0006] To address the problems existing in the prior art, the present invention provides a chlorine deep purification system and method based on low-temperature plasma synergistic catalysis.

[0007] To achieve the above objectives, the technical solution of the present invention is as follows:

[0008] A chlorine deep purification system based on low-temperature plasma synergistic catalysis includes a chlorine heater, a plasma generator, a first adsorption tower, a second adsorption tower, a regeneration gas pipe, a chlorine cooler, a waste gas incineration device, and a PLC controller. The inlet of the chlorine heater is connected to an inlet pipe, which is equipped with a chlorine inlet valve and a flow meter. The outlet of the chlorine heater is equipped with a first temperature sensor. The chlorine inlet valve, the first temperature sensor, and the flow meter are connected to the PLC controller. The first and second adsorption towers are connected in parallel. The tops of the first and second adsorption towers are connected to the chlorine inlet pipe and the regeneration gas outlet pipe, respectively, while the bottoms are connected to the chlorine outlet pipe and the regeneration gas inlet pipe. The outlet of the chlorine heater is connected to the inlet of the plasma generator, which is connected to the chlorine inlet pipe. The chlorine outlet pipe is connected to the inlet pipe of the chlorine cooler. The regeneration gas inlet pipe is connected to the regeneration gas pipe, and the regeneration gas outlet pipe is connected to the waste gas incineration device.

[0009] Furthermore, the chlorine heater is equipped with an electric heating element, which is connected to a power source, and the power source is connected to the PLC controller.

[0010] Furthermore, the plasma generator is equipped with a current source, which is connected to the PLC controller.

[0011] Furthermore, the chlorine inlet pipe is equipped with a first valve and a fifth valve, the chlorine outlet pipe is equipped with a second valve and a sixth valve, the regenerated gas outlet pipe is equipped with a third valve and a seventh valve, and the regenerated gas inlet pipe is equipped with a fourth valve and an eighth valve. The first valve, the second valve, the third valve, the fourth valve, the fifth valve, the sixth valve, the seventh valve, and the eighth valve are connected to the PLC controller.

[0012] Furthermore, the outlet of the chlorine cooler is connected to an outlet pipe, a second temperature sensor is provided on the outlet pipe, and a cooling water regulating valve is provided at the cooling water inlet of the chlorine cooler. The second temperature sensor and the cooling water regulating valve are connected to the PLC controller.

[0013] This invention also includes the following technical solutions:

[0014] A chlorine deep purification system based on low-temperature plasma synergistic catalysis using the above system includes the following steps:

[0015] Step 1: Monitor the flow rate of the chlorine gas to be purified using a flow meter, and introduce the chlorine gas into the heating zone of the chlorine heater through the inlet pipe. Use the PLC controller to adjust the heating power of the electric heating tube in the chlorine heater according to the temperature feedback from the first temperature sensor. At the same time, regulate the intake air volume through the chlorine gas inlet valve to heat the chlorine gas and maintain the temperature at 80-120℃.

[0016] Step 2: Pass chlorine gas heated to 80-120℃ into the plasma generator and generate low-temperature plasma under the drive of the current source. Use the high-energy electrons and free radicals in the plasma to dissociate the impurity molecules in the chlorine gas.

[0017] Step 3: The chlorine gas treated by plasma enters the first and second adsorption towers through the chlorine gas inlet pipe, and is purified by adsorption using the transition metal oxide adsorbent filled in the adsorption towers. The first and second adsorption towers are controlled by switching the first, second, third, fourth, fifth, sixth, seventh, and eighth valves to alternate between adsorption and regeneration operations. During the regeneration process, the regeneration medium is introduced through the regeneration gas pipe, and the regeneration tail gas is transported to the waste gas incineration unit for treatment through the regeneration gas outlet pipe.

[0018] Step 4: The purified chlorine gas enters the chlorine cooler through the chlorine gas outlet pipe. The PLC controller adjusts the cooling medium flow rate of the cooling water regulating valve according to the temperature feedback from the second temperature sensor, and the chlorine gas temperature is cooled to 20-30℃ before being output through the outlet pipe.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] This invention provides a chlorine deep purification system and method based on low-temperature plasma synergistic catalysis. The system uses a chlorine heater to pre-treat the incoming chlorine gas with temperature control. A first temperature sensor monitors the temperature in real time and transmits the data to a PLC controller, achieving precise control of the chlorine heating temperature. This creates suitable conditions for the subsequent efficient excitation of low-temperature plasma by the plasma generator, allowing high-energy active species in the plasma to more fully collide with impurity molecules in the chlorine gas and break their chemical bonds, significantly improving the initial dissociation efficiency of impurities. Simultaneously, the first and second adsorption towers are designed in parallel and connected to the chlorine inlet pipe and regeneration gas outlet pipe, respectively, and the chlorine outlet pipe and regeneration gas inlet pipe, in conjunction with the regeneration gas pipe, enable the operation of the two adsorption towers and... The alternating regeneration process effectively avoids downtime issues caused by regeneration during traditional single adsorption tower purification, ensuring the continuity of chlorine purification. The regeneration tail gas is transported to the waste gas incineration unit for treatment through the regeneration gas outlet pipe, ensuring that the waste gas emissions meet the standards and environmental protection requirements. In addition, the PLC controller can not only adjust the chlorine heater based on the data from the first temperature sensor, but also accurately control the intake volume through the chlorine inlet valve and flow meter. Combined with the coordinated linkage of various components, it realizes intelligent control of the entire purification process, improving the system's operational stability. The purified chlorine is then cooled to a suitable temperature by the chlorine cooler before being output, meeting the stringent requirements of downstream processes for chlorine quality and temperature, thus improving the overall efficiency and purity of chlorine purification. Attached Figure Description

[0021] The embodiments of the present invention will be further described below with reference to the accompanying drawings, wherein:

[0022] Figure 1 A schematic diagram of an embodiment of a chlorine deep purification system based on low-temperature plasma synergistic catalysis is shown;

[0023] Attached diagram labels: 1-Chlorine heater, 2-Plasma generator, 3-First adsorption tower, 4-Second adsorption tower, 5-Regeneration gas pipe, 6-Chlorine cooler, 7-Waste gas incinerator, 8-PLC controller, 1.1-Inlet pipe, 1.2-Chlorine inlet valve, 1.3-Electric heating element, 1.4-Power supply, 1.5-First temperature sensor, 1.6-Flow meter, 2.1-Current source, 3.1-First valve, 3.2-Second valve, 3.3-Third valve, 3.4-Fourth valve, 4.1-Fifth valve, 4.2-Sixth valve, 4.3-Seventh valve, 4.4-Eighth valve, 6.1-Cooling water regulating valve, 6.2-Second temperature sensor, 6.3-Outlet pipe. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0025] Reference Appendix Figure 1 A chlorine deep purification system based on low-temperature plasma synergistic catalysis includes a chlorine heater 1, a plasma generator 2, a first adsorption tower 3, a second adsorption tower 4, a regeneration gas pipe 5, a chlorine cooler 6, a waste gas incineration device 7, and a PLC controller 8. The inlet of the chlorine heater 1 is connected to an inlet pipe 1.1, which is equipped with a chlorine inlet valve 1.2 and a flow meter 1.6. The outlet of the chlorine heater 1 is equipped with a first temperature sensor 1.5. The chlorine inlet valve 1.2, the first temperature sensor 1.5, and the flow meter 1.6 are connected... Connect to PLC controller 8; the first adsorption tower 3 and the second adsorption tower 4 are connected in parallel, the top of the first adsorption tower 3 and the second adsorption tower 4 are connected to the chlorine gas inlet pipe and the regeneration gas outlet pipe, the bottom of the first adsorption tower 3 and the second adsorption tower 4 are connected to the chlorine gas outlet pipe and the regeneration gas inlet pipe; the outlet of the chlorine heater 1 is connected to the inlet of the plasma generator 2, the outlet of the plasma generator 2 is connected to the chlorine gas inlet pipe, the chlorine gas outlet pipe is connected to the inlet pipe of the chlorine cooler 6, the regeneration gas inlet pipe is connected to the regeneration gas pipe 5, and the regeneration gas outlet pipe is connected to the waste gas incineration device 7.

[0026] In one embodiment of the present invention, the chlorine heater 1 is provided with an electric heating tube 1.3, which is connected to a power supply 1.4, and the power supply 1.4 is connected to a PLC controller 8.

[0027] In one embodiment of the present invention, the plasma generator 2 is provided with a current source 2.1, which is connected to a PLC controller 8.

[0028] In one embodiment of the present invention, a first valve 3.1 and a fifth valve 4.1 are provided on the chlorine inlet pipe, a second valve 3.2 and a sixth valve 4.2 are provided on the chlorine outlet pipe, a third valve 3.3 and a seventh valve 4.3 are provided on the regeneration gas outlet pipe, and a fourth valve 3.4 and an eighth valve 4.4 are provided on the regeneration gas inlet pipe. The first valve 3.1, the second valve 3.2, the third valve 3.3, the fourth valve 3.4, the fifth valve 4.1, the sixth valve 4.2, the seventh valve 4.3, and the eighth valve 4.4 are connected to a PLC controller 8.

[0029] In one embodiment of the present invention, the outlet of the chlorine cooler 6 is connected to the outlet pipe 6.3, the outlet pipe 6.3 is provided with a second temperature sensor 6.2, the cooling water inlet of the chlorine cooler 6 is provided with a cooling water regulating valve 6.1, and the second temperature sensor 6.2 and the cooling water regulating valve 6.1 are connected to the PLC controller 8.

[0030] A chlorine deep purification system based on low-temperature plasma synergistic catalysis using the above system includes the following steps:

[0031] Step 1: Monitor the flow rate of the chlorine gas to be purified using flow meter 1.6, and introduce the chlorine gas into the heating zone of chlorine heater 1 through inlet pipe 1.1. Use PLC controller 8 to adjust the heating power of electric heating tube 1.3 in chlorine heater 1 according to the temperature feedback of first temperature sensor 1.5, and at the same time regulate the intake air volume through chlorine gas inlet valve 1.2 to heat the chlorine gas and maintain the temperature at 80-120℃.

[0032] Step 2: Chlorine gas heated to 80-120℃ is introduced into plasma generator 2. Under the drive of current source 2.1, low-temperature plasma is generated. The high-energy electrons and free radicals in the plasma are used to dissociate the impurity molecules in the chlorine gas.

[0033] Step 3: The chlorine gas treated by plasma enters the first adsorption tower 3 and the second adsorption tower 4 through the chlorine gas inlet pipe, and is purified by adsorption using the transition metal oxide adsorbent filled in the adsorption tower. The first adsorption tower 3 and the second adsorption tower 4 are controlled by switching the first valve 3.1, the second valve 3.2, the third valve 3.3, the fourth valve 3.4, the fifth valve 4.1, the sixth valve 4.2, the seventh valve 4.3 and the eighth valve 4.4 to alternately perform adsorption and regeneration operations. During the regeneration process, the regeneration medium is introduced through the regeneration gas pipe 5, and the regeneration tail gas is transported to the waste gas incineration device 7 for treatment through the regeneration gas outlet pipe.

[0034] Step 4: The purified chlorine gas enters the chlorine cooler 6 through the chlorine gas outlet pipe. The PLC controller 8 adjusts the cooling medium flow rate of the cooling water regulating valve 6.1 according to the temperature feedback from the second temperature sensor 6.2, and then outputs the chlorine gas through the outlet pipe 6.3 after cooling the chlorine gas temperature to 20-30℃.

[0035] Example 1

[0036] A chlorine deep purification system based on low-temperature plasma synergistic catalysis includes the following steps:

[0037] Step 1: Monitor the flow rate of the chlorine gas to be purified using flow meter 1.6, and introduce the chlorine gas into the heating zone of chlorine heater 1 through inlet pipe 1.1. Use PLC controller 8 to adjust the heating power of electric heating tube 1.3 in chlorine heater 1 according to the temperature feedback of first temperature sensor 1.5, and at the same time regulate the intake air volume through chlorine gas inlet valve 1.2 to heat the chlorine gas and maintain the temperature at 80℃.

[0038] Step 2: Chlorine gas heated to 80°C is introduced into plasma generator 2. Under the drive of current source 2.1, low-temperature plasma is generated. The high-energy electrons and free radicals in the plasma are used to dissociate the impurity molecules in the chlorine gas.

[0039] Step 3: The chlorine gas treated by plasma enters the first adsorption tower 3 and the second adsorption tower 4 through the chlorine gas inlet pipe, and is purified by adsorption using the transition metal oxide adsorbent filled in the adsorption tower. The first adsorption tower 3 and the second adsorption tower 4 are controlled by switching the first valve 3.1, the second valve 3.2, the third valve 3.3, the fourth valve 3.4, the fifth valve 4.1, the sixth valve 4.2, the seventh valve 4.3 and the eighth valve 4.4 to alternately perform adsorption and regeneration operations. During the regeneration process, the regeneration medium is introduced through the regeneration gas pipe 5, and the regeneration tail gas is transported to the waste gas incineration device 7 for treatment through the regeneration gas outlet pipe.

[0040] Step 4: The purified chlorine gas enters the chlorine cooler 6 through the chlorine gas outlet pipe. The PLC controller 8 adjusts the cooling medium flow rate of the cooling water regulating valve 6.1 according to the temperature feedback from the second temperature sensor 6.2, and then outputs the chlorine gas through the outlet pipe 6.3 after cooling the chlorine gas temperature to 20°C.

[0041] Example 2

[0042] A chlorine deep purification system based on low-temperature plasma synergistic catalysis includes the following steps:

[0043] Step 1: Monitor the flow rate of the chlorine gas to be purified using flow meter 1.6, and introduce the chlorine gas into the heating zone of chlorine heater 1 through inlet pipe 1.1. Use PLC controller 8 to adjust the heating power of electric heating tube 1.3 in chlorine heater 1 according to the temperature feedback of first temperature sensor 1.5, and at the same time regulate the intake air volume through chlorine gas inlet valve 1.2 to heat the chlorine gas and maintain the temperature at 120℃.

[0044] Step 2: Chlorine gas heated to 120°C is introduced into plasma generator 2. Under the drive of current source 2.1, low-temperature plasma is generated. The high-energy electrons and free radicals in the plasma are used to dissociate the impurity molecules in the chlorine gas.

[0045] Step 3: The chlorine gas treated by plasma enters the first adsorption tower 3 and the second adsorption tower 4 through the chlorine gas inlet pipe, and is purified by adsorption using the transition metal oxide adsorbent filled in the adsorption tower. The first adsorption tower 3 and the second adsorption tower 4 are controlled by switching the first valve 3.1, the second valve 3.2, the third valve 3.3, the fourth valve 3.4, the fifth valve 4.1, the sixth valve 4.2, the seventh valve 4.3 and the eighth valve 4.4 to alternately perform adsorption and regeneration operations. During the regeneration process, the regeneration medium is introduced through the regeneration gas pipe 5, and the regeneration tail gas is transported to the waste gas incineration device 7 for treatment through the regeneration gas outlet pipe.

[0046] Step 4: The purified chlorine gas enters the chlorine cooler 6 through the chlorine gas outlet pipe. The PLC controller 8 adjusts the cooling medium flow rate of the cooling water regulating valve 6.1 according to the temperature feedback from the second temperature sensor 6.2, and then outputs the chlorine gas through the outlet pipe 6.3 after cooling the chlorine gas temperature to 30°C.

[0047] In this invention, the electric heating element 1.3 in the chlorine heater 1 has a power range of 10-20kW. Under the coordinated action of the first temperature sensor 1.5 (measurement accuracy ±0.5℃) and the PLC controller 8, it can accurately control the chlorine temperature between 80-120℃, ensuring that the chlorine enters the subsequent purification and reaction stages at the optimal temperature, thus improving overall process stability and product quality. The plasma generator 2 adopts a specific structural design. Powered by the current source 2.1 (output current accuracy ±0.5A), it can achieve an impurity removal rate of over 80% in the chlorine, deeply purifying the chlorine and providing high-purity raw materials for chlor-alkali chemical production, reducing the interference of impurities on subsequent reactions. The first adsorption tower 3 and the second adsorption tower 4 are filled with adsorbents with large adsorption capacity and high selectivity, such as transition metal oxides with copper oxide and manganese dioxide as active components. Through precise switching of valves 3.1, 3.2, 3.3, 3.4, 4.1, 4.2, 4.3, and 4.4 (valve opening and closing times controlled within 0.5-1 seconds), efficient regeneration switching is achieved once per hour, ensuring continuous and stable operation of the adsorption towers and maintaining an adsorption efficiency of over 90%, effectively removing residual impurities in chlorine. The chlorine cooler 6 uses a high-efficiency heat exchanger. Under the coordinated control of the cooling water regulating valve 6.1 (high flow regulation accuracy and fast response speed) and the second temperature sensor 6.2, it can cool chlorine to 20-30℃, ensuring that chlorine enters subsequent chlor-alkali chemical production processes or storage stages at a suitable temperature, improving reaction efficiency. Relying on the intelligent algorithm of PLC controller 8, and using sensor data such as temperature, temperature change rate, flow rate, and valve status as input variables, and employing algorithms such as fuzzy logic and neural networks, it can quickly generate precise control commands within 0.5 seconds, drive each piece of equipment to perform precise actions, realize intelligent automated control of the entire chlorine deep purification process, improve production efficiency, and reduce the defect rate.

[0048] The process flow for chlorine purification using this invention is as follows:

[0049] The chlorine gas to be purified enters the chlorine heater 1 through the inlet pipe 1.1. The chlorine inlet valve 1.2 precisely regulates the inlet flow rate according to preset flow parameters to ensure stable operation and adaptability to subsequent processing. The electric heating element 1.3 heats the chlorine gas under the power supply 1.4, and the first temperature sensor 1.5 monitors the temperature in real time and transmits the data to the PLC controller 8. The controller adjusts the output power of the power supply 1.4 according to the built-in algorithm and preset temperature range to precisely control the heating intensity, so that the chlorine gas reaches the specific temperature suitable for plasma excitation and catalytic reaction, generally precisely controlling the chlorine gas temperature between 80-120℃. At the same time, the flow meter 1.6 continuously monitors the flow rate, providing key data for material balance and system optimization, and a flow rate range of 0-500m is selected. 3 / h, flow meter with an accuracy of ±0.5% 1.6.

[0050] The pre-treated chlorine gas flows into plasma generator 2, where a current source 2.1 provides a stable and precise current to excite high-intensity, low-temperature plasma. Under a high-frequency electric field, high-energy electrons, free radicals, and other active species in the plasma collide with impurity molecules in the chlorine gas, causing the impurity chemical bonds to break and dissociate, thus initially purifying the chlorine gas and achieving an impurity removal rate of over 80%.

[0051] The chlorine gas is then diverted to the first adsorption tower 3 and the second adsorption tower 4. During normal operation, the first valve 3.1 and the second valve 3.2 of the first adsorption tower 3 are open, while the third valve 3.3 and the fourth valve 3.4 are closed. In the second adsorption tower 4, the fifth valve 4.1 and the sixth valve 4.2 are closed, while the seventh valve 4.3 and the eighth valve 4.4 are open. The chlorine gas flows smoothly through the adsorption towers, where residual impurities are adsorbed by the transition metal oxide adsorbent filled inside, which contains copper oxide and manganese dioxide as active ingredients. The adsorption capacity of this adsorbent is not less than 50 mg / g. Crucially, the adsorption towers are regenerated and switched over every hour. When the first adsorption tower 3 is running and the second adsorption tower 4 is regenerating, the first valve 3.1 and the second valve 3.2 of the first adsorption tower 3 are open, and the third valve 3.3 and the fourth valve 3.4 are closed. The fifth valve 4.1 and the sixth valve 4.2 of the second adsorption tower 4 are closed, and the seventh valve 4.3 and the eighth valve 4.4 are open. Regenerated nitrogen gas is introduced into the second adsorption tower 4 through the regeneration gas pipe 5 for purging and regeneration. The regenerated tail gas is discharged to the tail gas incinerator. When the first adsorption tower 3 is regenerating and the second adsorption tower 4 is running, the valve states are reversed: the first valve 3.1 and the second valve 3.2 of the first adsorption tower 3 are closed, and the third valve 3.3 and the fourth valve 3.4 are open; the fifth valve 4.1 and the sixth valve 4.2 of the second adsorption tower 4 are open, and the seventh valve 4.3 and the eighth valve 4.4 are closed. This cycle repeats continuously to ensure the adsorption towers operate continuously and stably, maintaining an adsorption efficiency of over 90%.

[0052] After deep purification, the chlorine enters the chlorine cooler 6. The cooling water regulating valve 6.1 automatically adjusts the cooling water flow based on the chlorine temperature feedback monitored by the second temperature sensor 6.2, cooling the chlorine to a suitable temperature, generally 20-30℃, and then transports it to subsequent processes or storage through the gas outlet pipe 6.3.

[0053] Waste gas generated during production is collected and sent to waste gas incineration unit 7 for harmless treatment. The combustion efficiency of waste gas incineration unit 7 is not less than 95%, ensuring that pollutant emissions meet standards. PLC controller 8 collects sensor data such as temperature, flow rate, and valve status in real time, analyzes and processes the data using built-in intelligent algorithms, and automatically issues control commands according to preset process parameters and logic rules to precisely regulate the operating parameters of each piece of equipment, including chlorine inlet valve 1.2, electric heating tube 1.3, first valve 3.1, second valve 3.2, third valve 3.3, fourth valve 3.4, fifth valve 4.1, sixth valve 4.2, seventh valve 4.3, eighth valve 4.4, cooling water regulating valve 6.1, etc., to ensure stable, efficient, and intelligent operation of the chlorine deep purification process.

[0054] This invention provides a chlorine deep purification system and method based on low-temperature plasma synergistic catalysis. The system uses a chlorine heater to pre-treat the incoming chlorine gas with temperature control. A first temperature sensor monitors the temperature in real time and transmits the data to a PLC controller, achieving precise control of the chlorine heating temperature. This creates suitable conditions for the subsequent efficient excitation of low-temperature plasma by the plasma generator, allowing high-energy active species in the plasma to more fully collide with impurity molecules in the chlorine gas and break their chemical bonds, significantly improving the initial dissociation efficiency of impurities. Simultaneously, the first and second adsorption towers are designed in parallel and connected to the chlorine inlet pipe and regeneration gas outlet pipe, respectively, and the chlorine outlet pipe and regeneration gas inlet pipe, in conjunction with the regeneration gas pipe, enable the operation of the two adsorption towers and... The alternating regeneration process effectively avoids downtime issues caused by regeneration during traditional single adsorption tower purification, ensuring the continuity of chlorine purification. The regeneration tail gas is transported to the waste gas incineration unit for treatment through the regeneration gas outlet pipe, ensuring that the waste gas emissions meet the standards and environmental protection requirements. In addition, the PLC controller can not only adjust the chlorine heater based on the data from the first temperature sensor, but also accurately control the intake volume through the chlorine inlet valve and flow meter. Combined with the coordinated linkage of various components, it realizes intelligent control of the entire purification process, improving the system's operational stability. The purified chlorine is then cooled to a suitable temperature by the chlorine cooler before being output, meeting the stringent requirements of downstream processes for chlorine quality and temperature, thus improving the overall efficiency and purity of chlorine purification.

[0055] The foregoing descriptions have outlined some exemplary embodiments of the present invention. It is understood that these embodiments are merely illustrative and do not constitute a limitation on the scope of protection of the present invention. Features in these embodiments can be rearranged in suitable ways, and the resulting solutions remain within the scope of protection claimed by the present invention. All other embodiments obtained by those skilled in the art based on the foregoing embodiments without inventive effort, i.e., all modifications, equivalent substitutions, and improvements made within the spirit and principles of this application, fall within the scope of protection claimed by the present invention.

Claims

1. A chlorine deep purification system based on low-temperature plasma synergistic catalysis, characterized in that, The system includes a chlorine heater (1), a plasma generator (2), a first adsorption tower (3), a second adsorption tower (4), a regeneration gas pipe (5), a chlorine cooler (6), a waste gas incineration device (7), and a PLC controller (8). The inlet of the chlorine heater (1) is connected to an inlet pipe (1.1), which is equipped with a chlorine inlet valve (1.2) and a flow meter (1.6). The outlet of the chlorine heater (1) is equipped with a first temperature sensor (1.5). The chlorine inlet valve (1.2), the first temperature sensor (1.5), and the flow meter (1.6) are connected to the PLC controller (8). The first adsorption tower (3) and the second adsorption tower (4) are connected in parallel. The top of the first adsorption tower (3) and the second adsorption tower (4) are connected to the chlorine gas inlet pipe and the regeneration gas outlet pipe, and the bottom of the first adsorption tower (3) and the second adsorption tower (4) are connected to the chlorine gas outlet pipe and the regeneration gas inlet pipe. The outlet of the chlorine heater (1) is connected to the inlet of the plasma generator (2). The outlet of the plasma generator (2) is connected to the chlorine gas inlet pipe. The chlorine gas outlet pipe is connected to the inlet pipe of the chlorine cooler (6). The regeneration gas inlet pipe is connected to the regeneration gas pipe (5). The regeneration gas outlet pipe is connected to the waste gas incineration device (7).

2. The chlorine deep purification system based on low-temperature plasma synergistic catalysis according to claim 1, characterized in that, The chlorine heater (1) is equipped with an electric heating tube (1.3), which is connected to a power supply (1.4), and the power supply (1.4) is connected to the PLC controller (8).

3. The chlorine deep purification system based on low-temperature plasma synergistic catalysis according to claim 1, characterized in that, The plasma generator (2) is equipped with a current source (2.1), which is connected to the PLC controller (8).

4. The chlorine deep purification system based on low-temperature plasma synergistic catalysis according to claim 1, characterized in that, The chlorine inlet pipe is equipped with a first valve (3.1) and a fifth valve (4.1), the chlorine outlet pipe is equipped with a second valve (3.2) and a sixth valve (4.2), the regenerated gas outlet pipe is equipped with a third valve (3.3) and a seventh valve (4.3), and the regenerated gas inlet pipe is equipped with a fourth valve (3.4) and an eighth valve (4.4). The first valve (3.1), the second valve (3.2), the third valve (3.3), the fourth valve (3.4), the fifth valve (4.1), the sixth valve (4.2), the seventh valve (4.3), and the eighth valve (4.4) are connected to the PLC controller (8).

5. The chlorine deep purification system based on low-temperature plasma synergistic catalysis according to claim 1, characterized in that, The outlet of the chlorine cooler (6) is connected to the outlet pipe (6.3), and the outlet pipe (6.3) is equipped with a second temperature sensor (6.2). The cooling water inlet of the chlorine cooler (6) is equipped with a cooling water regulating valve (6.1). The second temperature sensor (6.2) and the cooling water regulating valve (6.1) are connected to the PLC controller (8).

6. A chlorine deep purification system based on low-temperature plasma synergistic catalysis using the system according to any one of claims 1-5, characterized in that, Includes the following steps: Step 1: Monitor the flow rate of the chlorine gas to be purified by the flow meter (1.6), and introduce the chlorine gas into the heating zone of the chlorine heater (1) through the inlet pipe (1.1). Use the PLC controller (8) to adjust the heating power of the electric heating tube (1.3) in the chlorine heater (1) according to the temperature feedback of the first temperature sensor (1.5). At the same time, regulate the intake air volume through the chlorine gas inlet valve (1.2) to heat the chlorine gas and maintain it at 80-120℃. Step 2: Pass chlorine gas heated to 80-120℃ into the plasma generator (2), and generate low-temperature plasma under the drive of the current source (2.1). Use the high-energy electrons and free radicals in the plasma to dissociate the impurity molecules in the chlorine gas. Step 3: After plasma treatment, chlorine gas enters the first adsorption tower (3) and the second adsorption tower (4) through the chlorine gas inlet pipe. It is then adsorbed and purified by the transition metal oxide adsorbent filled in the adsorption tower. The first adsorption tower (3) and the second adsorption tower (4) are controlled to alternately perform adsorption and regeneration operations by switching the first valve (3.1), the second valve (3.2), the third valve (3.3), the fourth valve (3.4), the fifth valve (4.1), the sixth valve (4.2), the seventh valve (4.3), and the eighth valve (4.4). During the regeneration process, the regeneration medium is introduced through the regeneration gas pipe (5), and the regeneration tail gas is transported to the waste gas incineration device (7) for treatment through the regeneration gas outlet pipe. Step 4: The purified chlorine gas enters the chlorine cooler (6) through the chlorine gas outlet pipe. The PLC controller (8) adjusts the cooling medium flow rate of the cooling water regulating valve (6.1) according to the temperature feedback of the second temperature sensor (6.2) to cool the chlorine gas temperature to 20-30℃ and then output it through the outlet pipe (6.3).

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