TOC online analysis system

Abstract

The invention relates to a TOC online analysis system, and relates to the field of online analysis equipment, the TOC online analysis system comprises a sampling module, a preprocessing module and a detection module, the sampling module is connected with a sample channel, and the preprocessing module is connected with the sampling module and the detection module; the pretreatment module comprises a bypass unit, a cooling unit, a pressure reducing valve, a flow control unit and a filter, the bypass unit is connected between the sampling module and the cooling unit, the cooling unit comprises a heat exchanger, a cooling water flow regulating valve and a temperature sensor, and a sample inlet of the heat exchanger is connected with the bypass unit; the temperature sensor is arranged on a sample outlet pipeline of the heat exchanger, the cooling water flow adjusting valve is arranged on a cooling water pipeline of the heat exchanger, the flow of the cooling water flow adjusting valve can be adjusted according to the detection result of the temperature sensor, and the pressure reducing valve, the flow control unit and the filter are arranged between the temperature sensor and the detection module. The TOC on-line detection precision of the detection sample can be ensured.

Description

Technical Field

[0001] The present application relates to the field of online analysis equipment, and in particular to a TOC online analysis system. Background Art

[0002] TOC stands for Total Organic Carbon, the sum of the carbon content of organic matter in water. All organic matter is composed of organic carbon, and TOC in water can reflect the degree of organic contamination. Therefore, TOC analysis has become a primary method for water quality monitoring and water treatment quality control in many countries around the world. TOC measurement is also required in drinking water supply, pharmaceuticals, food, and semiconductor industries, waste humification analysis, carbon flux analysis in aquatic systems, soil carbon content determination, and soil carbon cycling.

[0003] When organic matter in water is oxidized, the carbon released combines with oxygen to form CO2. Measuring the CO2 generated by the oxidation of water can detect the organic matter content in the water. Therefore, TOC is a good method for directly measuring organic pollutants in water. For some important water bodies, such as food and drug supply water, ultrapure water production lines, sensitive chemical water, industrial wastewater, etc., online and continuous detection of TOC is required. In recent years, online analysis of TOC in water bodies is usually performed using a TOC analyzer. The TOC analyzer quantitatively transports water samples, promotes the oxidation of organic carbon in the water through factors such as oxidants, ultraviolet rays, and catalysts, and detects the concentration of carbon dioxide after oxidation to continuously detect the TOC content in the sample. It has the advantages of strong real-time performance and high detection accuracy.

[0004] Existing TOC online analysis systems have high requirements for test samples, including temperature, pressure, flow and other parameters of the test samples. Especially when performing TOC testing on industrial wastewater, industrial wastewater usually has high temperature and high pressure, which can easily cause the temperature, pressure, flow and other parameters of the water sample to exceed the required values ​​of the analyzer, affecting the detection accuracy of the TOC analyzer. Summary of the Invention

[0005] In order to ensure the accuracy of online detection of TOC in test samples, the present application provides a TOC online analysis system.

[0006] The TOC online analysis system provided in this application adopts the following technical solutions: A TOC online analysis system includes a sampling module, a pretreatment module and a detection module. The sampling module is connected to an external sample channel. The pretreatment module is respectively connected to the sampling module and the detection module so as to pretreatment the detection sample extracted by the sampling module and then deliver it to the detection module for TOC detection. The pretreatment module includes a bypass unit, a cooling unit, a pressure reducing valve, a flow control unit and a filter. The bypass unit is connected between the sampling module and the cooling unit to provide a diversion path for part of the detection sample. The cooling unit includes a heat exchanger, a cooling water flow regulating valve and a temperature sensor. The sample inlet of the heat exchanger is connected to the bypass unit. The temperature sensor is arranged on the sample outlet pipeline of the heat exchanger. The cooling water flow regulating valve is arranged on the cooling water pipeline of the heat exchanger and can adjust the flow of cooling water according to the detection result of the temperature sensor. The pressure reducing valve, flow control unit and filter are respectively arranged on the connecting pipeline between the temperature sensor and the detection module.

[0007] By adopting the above technical solution, a pretreatment module including a bypass unit, a cooling unit, a pressure reducing valve, a flow control unit and a filter is used to adjust the temperature, pressure and flow of the test sample, and remove particulate matter in the test sample that affects the test results, thereby ensuring the TOC detection accuracy of the detection module and preventing the test sample parameters from exceeding the requirements of the detection module and causing damage to the detection module; by using a temperature sensor arranged on the sample outlet pipe of the heat exchanger and a cooling water flow regulating valve arranged on the cooling water pipe of the heat exchanger, the flow rate of the cooling water flow regulating valve can be adjusted according to the detection result of the temperature sensor, thereby reducing the consumption of cooling water while ensuring the stability of the temperature of the heat exchanger sample outlet.

[0008] In a specific embodiment, the cooling unit further includes a flow indicator, which is arranged on the cooling water pipeline of the heat exchanger to indicate the flow of cooling water in the cooling water pipeline of the heat exchanger and the size of the cooling water flow.

[0009] By adopting the above technical solution, the flow indicator arranged on the cooling water pipeline of the heat exchanger can indicate the cooling water flow on the cooling water pipeline, which is conducive to timely detection of water flow interruption in the cooling water pipeline and avoid damage to the detection instrument due to excessive temperature of the test sample.

[0010] In a specific possible implementation scheme, the flow indicator includes an indicator housing, an impeller, a permanent magnet, an induction coil and a light-emitting element. The indicator housing is connected to the cooling water pipeline of the heat exchanger and has a cooling water flow channel inside. The impeller is arranged in the cooling water flow channel, the permanent magnet is arranged on the impeller, the induction coil is arranged outside the indicator housing and corresponds to the permanent magnet, and the light-emitting element is connected to both ends of the induction coil.

[0011] By adopting the above technical solution, the permanent magnet arranged on the impeller can generate a changing magnetic field when the impeller rotates, and an induced electromotive force related to the cooling water flow rate is generated in the induction coil, driving the light-emitting elements connected to the two ends of the induction coil to emit light, thereby being able to prominently display the flow of cooling water and the size of its flow rate, and to generate an abnormal alarm signal, which is conducive to improving the effectiveness of cooling water flow monitoring.

[0012] In a specific possible implementation scheme, the bypass unit includes a Y-type filter, a bypass flow valve and a sample discharge pipeline, the inlet of the Y-type filter is connected to the sampling module, the outlet is connected to the cooling unit, the sewage outlet is connected to the bypass flow valve, and the bypass flow valve is connected to the sample discharge pipeline.

[0013] By adopting the above technical scheme, a Y-type filter is used, in which the inlet is connected to the sampling module, the outlet is connected to the cooling unit, and the sewage outlet is connected to the bypass flow valve. A part of the detection sample from the sampling module can be preliminarily filtered and then transported to the cooling unit for further cooling treatment. The other part of the unfiltered detection sample is discharged through the sewage outlet and transported to the sample discharge pipeline for discharge through the bypass flow valve, so that the flow rate of the detection sample flowing to the detection module is adapted to the detection requirements of the detection module. While improving the real-time detection performance of the detection unit, the workload of the cooling unit, the pressure reducing valve, the flow control unit and the filter is reduced; using the bypass flow valve arranged between the sewage outlet and the sample discharge pipeline, the flow rate of the detection sample flowing to the sample discharge pipeline through the sewage outlet can be adjusted, thereby conveniently adjusting the flow rate of the detection sample flowing to the detection unit.

[0014] In a specific embodiment, the bypass unit also includes a sample switching valve and a backwashing device. The sample switching valve is arranged on the inlet pipe of the Y-type filter, and the backwashing device is arranged on the outlet pipe of the Y-type filter, which can intermittently backwash the Y-type filter.

[0015] By adopting the above technical solution and utilizing the backwash device provided on the outlet pipeline of the Y-type filter, the test sample can be discharged into the pipeline after the sample switch valve is intermittently closed, so that the test sample flows back through the outlet of the Y-type filter to the sewage outlet, and the filter screen of the Y-type filter is backwashed to remove solid impurities attached to the filter screen and restore the filtering performance of the Y-type filter.

[0016] In a specific possible implementation scheme, the backwash device includes a backwash buffer cylinder, a reversing valve, a buffer throttle valve and a backwash trigger. A buffer piston is provided in the backwash buffer cylinder. A sample inlet and outlet are provided on the backwash buffer cylinder on one side of the buffer piston, and a gas inlet and outlet are provided on the backwash buffer cylinder on the other side. The sample inlet and outlet are connected to the outlet pipe of the Y-type filter, and the gas inlet and outlet are connected to the reversing valve. The reversing valve is connected to the buffer throttle valve and an external pressure gas source so that the gas inlet and outlet can be switched to be connected to the buffer throttle valve or to an external pressure gas source. The valve port of the buffer throttle valve is connected to the atmosphere, and the backwash trigger is connected to the reversing valve and the sample switch valve.

[0017] By adopting the above technical scheme, a backwash buffer cylinder with the sample inlet and outlet connected to the outlet pipeline of the Y-type filter and the gas inlet and outlet connected to the reversing valve can be used to continuously store a small portion of the test sample in the backwash buffer cylinder under the control of the reversing valve, and quickly discharge it into the outlet pipeline of the Y-type filter in a short time, thereby intermittently flushing the filter screen of the Y-type filter; by using the reversing valve connected to the buffer throttle valve and the external pressure gas source, the gas inlet and outlet can be switched to be connected to the buffer throttle valve, thereby slowly discharging the gas in the backwash buffer cylinder, so that the test sample slowly enters the backwash buffer cylinder, or the gas inlet and outlet can be switched to be connected to the external pressure gas source, and the external pressure gas is quickly introduced into the backwash buffer cylinder, pushing the test sample in the backwash buffer cylinder to be quickly discharged, thereby backwashing the filter screen of the Y-type filter; the backwash trigger can be used to control the interval time of backwashing of the Y-type filter, and the switching action of the reversing valve is synchronized with the opening and closing of the sample switch valve.

[0018] In a specific feasible implementation scheme, the sampling module includes a sampling interface, a sampling tube and a sampling flow control valve, the sampling interface is connected to the connecting port on the sample channel, the sampling tube is arranged on the sampling interface, and an inlet bevel is provided at the end, the end of the sampling tube is located in the sample channel, and the inlet bevel is away from the flow direction of the sample in the sample channel, the sampling flow control valve is arranged between the sampling tube and the pretreatment module, and the sampling flow control valve is connected to the pretreatment module through an integrated insulated pipe cable.

[0019] By adopting the above technical solution, a sampling tube with an end inlet slope facing away from the sample flow direction in the sample channel can be used to reduce the influence of the sample flow rate in the sample channel on the sample collection amount of the sampling module, thereby ensuring the stability of the sample collection amount; a sampling flow control valve arranged between the sampling tube and the pretreatment module can be used to preliminarily control the flow of the test sample collected by the sampling module, thereby ensuring that the collection amount of the test sample is within the range of variation of the transmission parameters in the sample channel and can meet the needs of TOC detection.

[0020] In a specific embodiment, the sampling flow control valve is a speed regulating valve.

[0021] By adopting the above technical solution and using the speed regulating valve as the sampling flow control valve, the influence of the sample pressure in the sample channel on the amount of sample collected for detection can be reduced, thereby improving the stability of the amount of sample collected for detection.

[0022] In a specific possible implementation scheme, the TOC online analysis system of the present application also includes an analysis cabinet, which is provided with a detection sample interface, a sample discharge interface, a cooling water input interface and a cooling water output interface. The sampling module is arranged outside the analysis cabinet and is connected to the outer end of the detection sample interface. The pretreatment module and the detection module are arranged inside the analysis cabinet. The bypass unit is connected to the inner end of the detection sample interface and the sample discharge interface. The cooling water pipeline of the heat exchanger is respectively connected to the cooling water input interface and the cooling water output interface. The detection module includes a TOC analyzer, and the TOC analyzer is provided with a sample introduction interface and a sample recovery interface. The sample introduction interface is connected to the pretreatment module, and the sample recovery interface is connected to the sample discharge interface.

[0023] By adopting the above technical solution, by arranging the pretreatment module and the detection module inside the analysis cabinet, the pretreatment module and the detection module can be isolated from the external environment, which is conducive to maintaining the stability of the test sample and the environment in which the detection module is located, thereby ensuring the detection accuracy of the TOC content in the test sample; by utilizing the test sample interface arranged on the analysis cabinet, the test sample collected by the sampling module outside the analysis cabinet can be conveniently transported to the inside of the analysis cabinet, and after being processed by the pretreatment module, it is sent to the detection module for TOC content detection, and the sample discharge interface arranged on the analysis cabinet is connected to the external sample processing device to discharge the test sample discharged through the bypass and the test sample after detection by the detection module; by utilizing the cooling water input interface and the cooling water output interface arranged on the analysis cabinet to connect to the external circulating cooling water source, external circulating cooling water is introduced to cool the test sample.

[0024] In a specific possible implementation scheme, the detection module also includes a purge unit, which includes a purge switching valve and a purge pressure reducing valve. The analysis cabinet is also provided with an instrument air interface, the purge switching valve is connected to the instrument air interface, and the purge pressure reducing valve is connected between the purge switching valve and the TOC analyzer.

[0025] By adopting the above technical solution, the purge switch valve connected to the instrument air interface can be used to control the on-off of instrument air from the outside, thereby controlling whether the instrument air is introduced into the interior of the TOC analyzer to purge the detection exhaust gas in the TOC analyzer; the purge pressure reducing valve can be used to control the pressure and flow of the instrument air entering the TOC analyzer, while discharging the detection exhaust gas in the TOC analyzer, improving the working safety of the TOC analyzer, and ensuring the stability of the working temperature of the TOC analyzer.

[0026] In summary, this application includes at least one of the following beneficial technical effects: By arranging a temperature sensor on the sample outlet pipe of the heat exchanger and a cooling water flow regulating valve on the cooling water pipe of the heat exchanger, the temperature of the test sample after heat exchange in the heat exchanger can be detected, and the flow rate of the cooling water flow regulating valve can be adjusted according to the temperature of the test sample after heat exchange, thereby ensuring the stability of the test sample temperature flowing out of the sample outlet of the heat exchanger and ensuring that the cooling water flow rate is adapted to the cooling requirement of the test sample, thereby reducing the consumption of cooling water; By arranging a permanent magnet on the impeller of the flow indicator, the permanent magnet can rotate as the test sample flows in the flow indicator, generating a changing magnetic field outside the flow indicator. The speed of change of the magnetic field is proportional to the flow rate of the test sample. An induced electromotive force proportional to the flow rate of the test sample is generated in the induction coil, driving the light-emitting element to emit light. The brightness of the light is positively correlated with the flow rate of the test sample. Therefore, the flow status of the test sample can be clearly indicated by the brightness of the light-emitting element. By arranging a backwash device on the outlet pipeline of the Y-type filter, the sample inlet and outlet of the backwash buffer cylinder are connected to the outlet pipeline of the Y-type filter. During normal detection, the test sample enters the backwash buffer cylinder through the sample inlet and outlet. The buffer throttle valve is used to control the entry speed of the test sample, so that a small amount of test sample slowly enters the backwash buffer cylinder. During the backwash period, external pressure gas is quickly introduced into the backwash buffer cylinder to push the test sample in the backwash buffer cylinder to quickly flow out, and the Y-type filter is intermittently backwashed to ensure the filtering performance of the Y-type filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of an embodiment of the present application.

[0028] Figure 2 This is a schematic diagram of the flow indicator structure in one embodiment of the present application.

[0029] Figure 3 This is a schematic diagram of a backwash device in one embodiment of the present application.

[0030] Figure 4 This is a schematic diagram of the structure of a partial cabinet analysis in one embodiment of the present application.

[0031] Explanation of the accompanying symbols: 1. Sampling module; 11. Sampling interface; 12. Sampling tube; 13. Sampling flow control valve; 2. Pretreatment module; 21. Bypass unit; 211. Y-type filter; 212. Bypass flow valve; 213. Sample discharge pipeline; 214. Sample switch valve; 215. Backwash device; 2151. Backwash buffer cylinder; 2152. Reversing valve; 2153. Buffer throttle valve; 2154. Backwash trigger; 2155. Buffer piston; 2156. Sample inlet and outlet; 2157. Gas inlet and outlet; 22. Cooling unit; 221. Heat exchanger; 222. Cooling water flow regulating valve; 223. Temperature Sensor; 224, flow indicator; 2241, indicator housing; 2242, impeller; 2243, permanent magnet; 2244, induction coil; 2245, light-emitting element; 23, pressure reducing valve; 24, flow control unit; 25, filter; 3, detection module; 31, TOC analyzer; 311, sample introduction interface; 312, sample recovery interface; 32, purge unit; 321, purge switching valve; 322, purge pressure reducing valve; 4, sample channel; 5, analysis cabinet; 51, detection sample interface; 52, sample discharge interface; 53, cooling water input interface; 54, cooling water output interface; 55, instrument air interface. DETAILED DESCRIPTION

[0032] The specific embodiments of the present application are described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present application and are not intended to limit the present application.

[0033] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "disposed" and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0034] An embodiment of the TOC online analysis system of the present application is as follows: Figure 1As shown, it includes a sampling module 1, a pretreatment module 2 and a detection module 3. The sampling module 1 can be connected to an external sample channel 4 for extracting detection samples from the external sample channel 4. The external sample channel 4 transmits samples extracted from various detection targets, such as river water samples extracted from river water bodies that need to be monitored, finished pure water samples extracted from pure water production lines, heat exchanger water samples extracted from industrial production lines, and so on. Depending on the detection target, the detection samples have different temperatures and pressures. In order to ensure that the detection samples extracted at different temperatures and pressures can meet the needs of TOC detection, the flow rate of the extracted detection samples is usually much greater than the need for online detection by the pretreatment module 2.

[0035] The pretreatment module 2 is connected between the sampling module 1 and the detection module 3, and is used to pretreat the test sample extracted by the sampling module 1, such as cooling, reducing pressure, limiting flow, filtering, etc., so that the temperature, pressure, flow rate and solid impurities contained in the test sample meet the sampling requirements of the analyzer, and the pretreated test sample is transported to the detection module 3 for TOC detection, ensuring that the analytical instrument in the detection module 3 can operate normally and provide accurate analysis results.

[0036] The pretreatment module 2 includes a bypass unit 21, a cooling unit 22, a pressure reducing valve 23, a flow control unit 24, and a filter 25. The bypass unit 21 is connected between the sampling module 1 and the cooling unit 22, and can establish a shunt path on the output pipeline of the sampling module 1, so that part of the test sample extracted by the sampling module 1 flows directly out through the shunt path, thereby reducing the flow rate of the test sample transmitted to the cooling unit 22, so that the flow rate of the test sample subsequently transmitted to the detection module 3 is adapted to the detection requirements of the detection module 3.

[0037] The cooling unit 22 includes a heat exchanger 221, a cooling water flow regulating valve 222, and a temperature sensor 223. The heat exchanger 221 can use various types of suitable heat exchangers, such as shell and tube heat exchangers, double-tube heat exchangers, and plate heat exchangers. The heat exchanger 221 includes a sample passage and a cooling water passage that are isolated from each other. The sample inlet of the heat exchanger 221 is connected to the bypass unit 21, and the temperature sensor 223 is arranged on the sample outlet pipeline of the heat exchanger 221. The cooling water inlet of the heat exchanger 221 is connected to an external cooling water source, and the cooling water outlet is connected to an external recovery water tank. The cooling water in the external cooling water source enters the cooling water passage of the heat exchanger 221 under the drive of a water pump to cool the test sample flowing through the sample passage.

[0038] The cooling water flow regulating valve 222 is installed on the cooling water pipeline connected to the heat exchanger 221. Specifically, it can be installed at the cooling water inlet end of the heat exchanger 221, or it can be installed at the cooling water outlet end of the heat exchanger 221. The control signal of the cooling water flow regulating valve 222 is associated with the detection signal of the temperature sensor 223. Typically, the cooling water flow regulating valve 222 and the temperature sensor 223 are both connected to the controller of the online analysis system. The controller sends a control signal based on the detection result of the temperature sensor 223 to adjust the valve opening size of the cooling water flow regulating valve 222, thereby controlling the flow rate of cooling water passing through the cooling water flow regulating valve 222, that is, the amount of heat removed from the test sample, so as to maintain the temperature of the test sample after heat exchange through the heat exchanger 221 at a set level.

[0039] A pressure reducing valve 23, a flow control unit 24, and a filter 25 are sequentially disposed on the connecting pipeline between the temperature sensor 223 and the detection module 3. The pressure reducing valve 23 reduces the pressure of the test sample to a level acceptable to the detection module 3. The flow control unit 24 can utilize a rotameter with flow regulation, such as the DK800 rotameter from Cologne. This allows the flow rate of the test supplies to be adjusted to the level required by the detection module 3. The filter 25 can be a micron-grade filter to remove solid impurities from the test sample, preventing them from settling in the detection module 3 and affecting its normal operation.

[0040] In some embodiments of the TOC online analysis system of the present application, Figure 1 As shown, a flow indicator 224 is also provided in the cooling unit 22. The flow indicator 224 can use various devices that can indicate the flow state of the fluid, such as an impeller sight glass flow indicator. The flow indicator 224 is provided on the cooling water pipeline of the heat exchanger 221. When cooling water flows in the cooling water pipeline, the flow state of the cooling water can be observed through the indicating component of the flow indicator 224, such as observing the rotation of the impeller through the sight glass, and the rotation speed of the impeller is proportional to the flow rate of the cooling water. In this way, the flow indicator 224 can be used to know whether cooling water flows in the cooling water pipeline of the heat exchanger 221, as well as the size of the cooling water flow rate, to avoid abnormal cooling water supply due to failure of the cooling water source or the cooling water pipeline, causing abnormal increase in the temperature of the test sample and damage to the TOC analyzer.

[0041] In a preferred embodiment of the TOC online analysis system of the present application, Figure 1 and Figure 2As shown, the flow indicator 224 includes an indicator housing 2241, an impeller 2242, a permanent magnet 2243, an induction coil 2244, and a light-emitting element 2245. A cooling water flow channel is provided inside the indicator housing 2241. The indicator housing 2241 is connected to the cooling water pipeline of the heat exchanger 221, so that the cooling water flowing in the cooling pipeline flows through the cooling water flow channel inside the indicator housing 2241. The impeller 2242 is rotatably provided in the cooling water flow channel. When the cooling water flows in the cooling water flow channel, it can drive the impeller 2242 to rotate. The permanent magnet 2243 is provided at the edge of the impeller 2242. When the impeller 2242 rotates, it can drive the permanent magnet 2243 to rotate together.

[0042] The induction coil 2244 is positioned outside the cooling water flow path of the indicator housing 2241. An iron core may also be disposed within the induction coil 2244. The induction coil 2244 is positioned along the rotation path of the permanent magnet 2243, with one end of the iron core aligned with the rotation trajectory of the permanent magnet 2243. When the permanent magnet 2243 passes the end of the induction coil 2244, the magnetic field strength through the induction coil 2244 changes, generating an induced electromotive force within the induction coil 2244. The light-emitting element 2245 typically utilizes an LED lighting circuit, which may include several LEDs. The light-emitting element 2245 is connected to both ends of the induction coil 2244. As the permanent magnet 2243 repeatedly passes the corresponding position of the induction coil 2244, the IED flashes and emits light. The frequency and intensity of the light emission are positively correlated with the rotation speed of the impeller 2242, i.e., the flow rate of the cooling water.

[0043] In this way, the light emitted by the light-emitting element 2245 can clearly indicate the flow state of the cooling water, which is helpful for the staff to promptly discover the abnormality of the cooling water flow channel state, avoid the staff's negligence in observation resulting in the abnormality of the cooling water flow state going undetected, and better ensure the safety of the TOC analyzer.

[0044] In some embodiments of the TOC online analysis system of the present application, Figure 1As shown, the bypass unit 21 includes a Y-type filter 211, a bypass flow valve 212, and a sample discharge line 213. The Y-type filter 211 can be made of various suitable commercial components. The inlet of the Y-type filter 211 is connected to the sampling module 1, and the outlet is connected to the cooling unit 22. The portion of the test sample collected by the sampling module 1 is filtered by the Y-type filter 211 and then flows to the cooling unit 22. The drain port of the Y-type filter 211 is connected to the bypass flow valve 212, and the bypass flow valve 212 is connected to the sample discharge line 213. The portion of the unfiltered test sample collected by the sampling module 1 flows through the drain port of the Y-type filter 211 and the bypass flow valve 212 to the sample discharge line 213, forming a discharge bypass for the test sample. The sample discharge line 213 is connected to an external sample processing device, and the test sample discharged through the discharge bypass is processed by the sample processing device and then discharged.

[0045] The bypass flow valve 212 can be used to adjust the flow of the test sample discharged through the discharge bypass, thereby indirectly adjusting the flow of the test sample delivered to the cooling unit 22 through the outlet of the Y-type filter 211 and finally delivered to the detection module 3, ensuring that the flow of the test sample delivered to the detection module 3 is compatible with the detection requirements of the detection module 3.

[0046] In a preferred embodiment of the TOC online analysis system of the present application, Figure 1 and Figure 3 As shown, the bypass unit 21 is further provided with a sample switching valve 214 and a backwashing device 215. The sample switching valve 214 is provided on the inlet pipeline of the Y-type filter 211, and the backwashing device 215 is provided on the outlet pipeline of the Y-type filter 211. The backwashing device 215 can intermittently inject backwashing liquid into the outlet pipeline of the Y-type filter 211 to intermittently backwash the filter screen in the Y-type filter 211.

[0047] When the backwash device 215 backwashes the Y-type filter 211, the sample switching valve 214 is closed. On the one hand, this prevents the backwash liquid injected by the backwash device 215 from flowing to the inlet of the Y-type filter 211, affecting the accuracy of the TOC test results in the test sample; on the other hand, it reduces the pressure at the inlet of the Y-type filter 211, which is conducive to the backwash liquid flowing back through the filter screen inside the Y-type filter 211, flowing out through the sewage outlet of the Y-type filter 211, and being discharged through the discharge bypass. The pressure reducing valve 23 can prevent the backwash liquid from flowing to the detection module 3 in a short period of time. The backwash liquid injected during the backwash period will inevitably affect the TOC test results of the detection module 3 in a short period of time. Therefore, the test results of the detection module 3 can be shielded during the backwash period.

[0048] As a specific embodiment of the TOC online analysis system of the present application, Figure 1 and Figure 3 As shown, the backwash device 215 includes a backwash buffer cylinder 2151, a reversing valve 2152, a buffer throttle valve 2153, and a backwash trigger 2154. The backwash buffer cylinder 2151 is internally provided with a piston chamber, in which a buffer piston 2155 is disposed and slidable. The buffer piston 2155 may or may not be provided with a piston rod. If provided, the piston rod extends through the end of the backwash buffer cylinder 2151. The piston rod ensures increased positional stability of the buffer piston 2155 as it slides.

[0049] A sample inlet and outlet 2156 is provided on the backwash buffer cylinder 2151 on one side of the buffer piston 2155. The sample inlet and outlet 2156 is connected to the outlet pipeline of the Y-type filter 211. The test sample flowing out of the outlet pipeline of the Y-type filter 211 can enter the backwash buffer cylinder 2151 through the sample inlet and outlet 2156, and the test sample in the backwash buffer cylinder 2151 can also flow into the outlet pipeline of the Y-type filter 211 through the sample inlet and outlet 2156.

[0050] A gas inlet and outlet 2157 is provided on the backwash buffer cylinder 2151 on the other side of the buffer piston 2155. Gas inlet and outlet 2157 is connected to one oil port of the reversing valve 2152. The other two oil ports of the reversing valve 2152 are connected to the buffer throttle valve 2153 and an external pressure gas source, respectively. Controlling the operation of the reversing valve 2152 switches gas inlet and outlet 2157 to either connect to the buffer throttle valve 2153 through the internal flow passage of the reversing valve 2152 or to connect to the external pressure gas source through the internal flow passage of the reversing valve 2152.

[0051] The valve port of the buffer throttle valve 2153 is connected to the atmosphere. When the gas inlet and outlet 2157 is connected to the buffer throttle valve 2153, the test sample in the outlet pipeline of the Y-type filter 211 is driven by the pressure in the pipeline through the sample inlet and outlet 2156 and enters the backwash buffer cylinder 2151 on one side of the buffer piston 2155, pushing the buffer piston 2155 to slide toward the gas inlet and outlet 2157. The gas pressure in the backwash buffer cylinder 2151 on the other side of the buffer piston 2155 increases, and the gas is discharged into the atmosphere through the buffer throttle valve 2153. The buffer throttle valve 2153 can control the flow rate of gas discharged into the atmosphere, thereby controlling the speed at which the test sample in the outlet pipeline of the Y-type filter 211 enters the backwash buffer cylinder 2151, thereby reducing the impact on the flow rate of the test sample transmitted to the detection module 3.

[0052] When the gas inlet and outlet 2157 is connected to the external pressure gas source, the pressurized gas in the external pressure gas source quickly enters the backwash buffer cylinder 2151 through the gas inlet and outlet 2157. Since the sample on-off valve 214 is simultaneously closed at this time, the pressure of the external pressure gas source is much greater than the pressure of the test sample in the outlet pipeline of the Y-type filter 211. The pressurized gas pushes the buffer piston 2155 to slide rapidly toward the sample inlet and outlet 2156, pushing the test sample in the backwash buffer cylinder 2151 to quickly enter the outlet pipeline of the Y-type filter 211. It is then discharged through the drain port of the Y-type filter 211, the bypass flow valve 212, and the sample discharge pipeline 213, thereby backwashing the filter screen in the Y-type filter 211.

[0053] The backwash trigger 2154 can be any trigger device capable of intermittently controlling the reversing action of the reversing valve 2152, such as a timer. The backwash trigger 2154 is connected to the reversing valve 2152 and the sample on-off valve 214. The timer can generate a trigger signal at regular intervals to drive the reversing valve 2152 and the sample on-off valve 214 to operate synchronously, thereby switching the gas inlet and outlet 2157 to connect to the external pressure gas source and closing the sample on-off valve 214.

[0054] Alternatively, two piston position sensors can be installed at different locations in the backwash buffer cylinder 2151 to serve as backwash triggers 2154. These piston position sensors generate a trigger signal when the buffer piston 2155 moves to a corresponding position. When the buffer piston 2155 moves to a position close to the first piston position sensor at one end of the gas inlet and outlet 2157, the first piston position sensor generates a trigger signal, controlling the operation of the reversing valve 2152, connecting the gas inlet and outlet 2157 to the external pressure gas source. Simultaneously, the sample on-off valve 214 is closed, causing the Y-type filter 211 to be backwashed. At this time, the buffer piston 2155 moves rapidly toward the sample inlet and outlet 2156. When the buffer piston 2155 moves to the position of the second piston position sensor close to one end of the sample inlet and outlet 2156, the second piston position sensor generates a trigger signal, controls the reversing valve 2152 to operate so that the gas inlet and outlet 2157 is connected to the buffer throttle valve 2153, and the gas in the backwash buffer cylinder 2151 is slowly discharged into the atmosphere through the buffer throttle valve 2153; at the same time, the sample switch valve 214 is controlled to open, and part of the detection sample flows in and out through the outlet of the Y-type filter 211, and slowly enters the backwash buffer cylinder 2151 through the sample inlet and outlet 2156, pushing the buffer piston 2155 to move slowly toward the side of the gas inlet and outlet 2157. At the same time, part of the detection sample flows to the cooling unit 22, and is transported to the detection module 3 for TOC detection after pretreatment.

[0055] The gas flow through buffer throttle valve 2153 determines the flow of the test sample entering sample inlet and outlet 2156. This also determines the time it takes for buffer piston 2155 to move from the position corresponding to the second piston position sensor to the position corresponding to the first piston position sensor. This time is also the backwash interval. Therefore, by controlling the flow rate through buffer throttle valve 2153, the interval between two backwashes can be controlled.

[0056] In some embodiments of the TOC online analysis system of the present application, Figure 1 As shown, the sampling module 1 includes a sampling interface 11, a sampling tube 12, and a sampling flow control valve 13. A connection port for sample collection is provided on the sample channel 4. The sampling interface 11 is a connection port adapted to the connection port on the sample channel 4. A sampling tube 12 is provided on the sampling interface 11. When the sampling interface 11 is connected to the connection port on the sample channel 4, the end of the sampling tube 12 is located within the sample channel 4. An inlet bevel is provided at the end of the sampling tube 12. The position of the end of the sampling tube 12 within the sample channel 4 is such that the inlet bevel of the end faces away from the flow direction of the sample in the sample channel 4, that is, toward the downstream direction of the sample flow in the sample channel 4.

[0057] The sampling flow control valve 13 is arranged between the sampling tube 12 and the pretreatment module 2. The other end of the sampling tube 12 can be directly connected to the sampling flow control valve 13 through a pipeline, or it can be opened in the sampling interface 11 and connected between the sampling interface 11 and the sampling flow control valve 13 through a pipeline, so that the sampling tube 12 is connected to the sampling flow control valve 13. The sampling flow control valve 13 is connected to the pretreatment module 2 through an integrated thermal insulation pipe and cable. The sampling flow control valve 13 can preliminarily control the flow of the test sample flowing into the pretreatment module 2 through the sampling tube 12; the integrated thermal insulation pipe and cable can isolate the test sample in the pipe and cable from the external environment, which can prevent the high temperature test sample from causing burns to people who come into contact with it, and can also prevent the test sample at room temperature from solidifying in a cold environment and affecting the transmission of the test sample.

[0058] In a preferred embodiment of the TOC online analysis system of the present application, the sampling flow control valve 13 is a flow regulating valve. The use of a flow regulating valve can reduce the impact of pressure changes of the sample in the sample channel 4 on the flow rate of the test sample delivered to the pretreatment module 2, thereby ensuring a relatively stable flow rate of the test sample delivered to the pretreatment module 2.

[0059] In some embodiments of the TOC online analysis system of the present application, Figure 1 and Figure 4As shown, the TOC online analysis system of the present application also includes an analysis cabinet 5. A sample interface 51, a sample discharge interface 52, a cooling water input interface 53, and a cooling water output interface 54 are provided on the side walls of the analysis cabinet 5. A sampling module 1 is disposed outside the analysis cabinet 5. A pipeline for transporting test samples from the sampling module 1 is connected to the connection end of the sample interface 51 located outside the analysis cabinet 5.

[0060] The pretreatment module 2 and the detection module 3 are arranged in the analysis cabinet 5, and the analysis cabinet 5 is used to form an isolation from the external space. The inlet of the bypass unit 21 is connected to the inner side end of the detection sample interface 51, and the bypass output port of the bypass unit 21 is connected to the sample discharge interface 52. The detection sample discharged by the bypass flows out through the sample discharge interface 52 and is transported to the external sample processing device to process the detection sample and then discharge it. The cooling water pipeline of the heat exchanger 221 is respectively connected to the cooling water input interface 53 and the cooling water output interface 54. The cooling water of the external cooling water source enters the analysis cabinet 5 through the cooling water input interface 53, enters the heat exchanger 221 and performs heat exchange with the detection sample. The cooling water after heat exchange flows back to the external cooling water source through the cooling water output interface 54 for recycling.

[0061] The detection module 3 includes a TOC analyzer 31, which is a commercially available TOC analyzer capable of performing continuous online TOC testing on test samples. The TOC analyzer 31 is equipped with a sample introduction port 311 and a sample recovery port 312. The sample introduction port 311 is connected to the pretreatment module 2 for introducing the pretreated test sample from the pretreatment module 2. The sample recovery port 312 is connected to the sample discharge port 52. After testing by the TOC analyzer 31, waste sample liquid is discharged through the sample discharge port 52 and transported to an external sample processing device for treatment before discharge.

[0062] In a preferred embodiment of the TOC online analysis system of the present application, Figure 1 and Figure 4 As shown, the detection module 3 is further provided with a purge unit 32, which includes a purge switching valve 321 and a purge pressure reducing valve 322. An instrument air interface 55 is also provided on the analysis cabinet 5. The purge switching valve 321 is connected to the instrument air interface 55, the outer end of which is connected to an external high-pressure instrument air source. The inlet of the purge pressure reducing valve 322 is connected to the purge switching valve 321 via a pipeline, and the outlet is connected to the interior of the housing of the TOC analyzer 31 via a pipeline.

[0063] When the purge on-off valve 321 is open, external high-pressure instrument air is delivered to the purge pressure reducing valve 322. After being reduced in pressure by the purge pressure reducing valve 322, it is delivered to the TOC analyzer 31, thereby purging the detection exhaust gas inside the casing of the TOC analyzer 31. This not only reduces the detection exhaust gas concentration in the TOC analyzer 31 and ensures the internal environmental safety of the TOC analyzer 31, but also discharges heat from the TOC analyzer 31 and reduces the internal temperature of the TOC analyzer 31. The purge pressure reducing valve 322 can reduce the purge speed and flow rate of the instrument air in the TOC analyzer 31, ensuring the stability of the detection environment within the TOC analyzer 31.

[0064] Throughout the description of this application, reference to terms such as "one embodiment," "specific embodiment," and "preferred embodiment" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of this application. In this application, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0065] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A TOC online analysis system, comprising a sampling module (1), a pretreatment module (2) and a detection module (3), wherein the sampling module (1) is connected to an external sample channel (4), and the pretreatment module (2) is connected to the sampling module (1) and the detection module (3) respectively, so as to be able to pre-treat the detection sample extracted by the sampling module (1) and then deliver it to the detection module (3) for TOC detection, characterized in that: The pretreatment module (2) includes a bypass unit (21), a cooling unit (22), a pressure reducing valve (23), a flow control unit (24) and a filter (25). The bypass unit (21) is connected between the sampling module (1) and the cooling unit (22) to provide a bypass path for part of the detection sample. The cooling unit (22) includes a heat exchanger (221), a cooling water flow regulating valve (222) and a temperature sensor (223). The sample inlet of the heat exchanger (221) is connected to the bypass unit (21). The temperature sensor (223) is arranged on the sample outlet pipeline of the heat exchanger (221), the cooling water flow regulating valve (222) is arranged on the cooling water pipeline of the heat exchanger (221), and can adjust the flow rate of the cooling water flow regulating valve (222) according to the detection result of the temperature sensor (223), and the pressure reducing valve (23), the flow control unit (24) and the filter (25) are respectively arranged on the connecting pipeline between the temperature sensor (223) and the detection module (3).

2. The TOC online analysis system according to claim 1, characterized in that: The cooling unit (22) further includes a flow indicator (224), which is arranged on the cooling water pipeline of the heat exchanger (221) to indicate the flow of cooling water in the cooling water pipeline of the heat exchanger (221) and the magnitude of the cooling water flow.

3. The TOC online analysis system according to claim 2, characterized in that: The flow indicator (224) comprises an indicator housing (2241), an impeller (2242), a permanent magnet (2243), an induction coil (2244) and a light-emitting element (2245). The indicator housing (2241) is connected to the cooling water pipeline of the heat exchanger (221) and is provided with a cooling water flow channel therein. The impeller (2242) is provided in the cooling water flow channel. The permanent magnet (2243) is provided on the impeller (2242). The induction coil (2244) is provided outside the indicator housing (2241) and is provided corresponding to the permanent magnet (2243). The light-emitting element (2245) is connected to both ends of the induction coil (2244).

4. The TOC online analysis system according to claim 1, characterized in that: The bypass unit (21) includes a Y-type filter (211), a bypass flow valve (212) and a sample discharge pipeline (213), wherein the inlet of the Y-type filter (211) is connected to the sampling module (1), the outlet is connected to the cooling unit (22), the sewage outlet is connected to the bypass flow valve (212), and the bypass flow valve (212) is connected to the sample discharge pipeline (213).

5. The TOC online analysis system according to claim 4, characterized in that: The bypass unit (21) further includes a sample switching valve (214) and a backwashing device (215), wherein the sample switching valve (214) is arranged on the inlet pipeline of the Y-type filter (211), and the backwashing device (215) is arranged on the outlet pipeline of the Y-type filter (211), and can intermittently backwash the Y-type filter (211).

6. The TOC online analysis system according to claim 5, characterized in that: The backwash device (215) includes a backwash buffer cylinder (2151), a reversing valve (2152), a buffer throttle valve (2153) and a backwash trigger (2154). A buffer piston (2155) is provided in the backwash buffer cylinder (2151). A sample inlet and outlet (2156) is provided on the backwash buffer cylinder (2151) on one side of the buffer piston (2155), and a gas inlet and outlet (2157) is provided on the backwash buffer cylinder (2151) on the other side. The sample inlet and outlet (2156) is connected to the Y-type filter. (211) is connected to the outlet pipeline, the gas inlet and outlet (2157) is connected to the reversing valve (2152), the reversing valve (2152) is connected to the buffer throttle valve (2153) and the external pressure gas source, so that the gas inlet and outlet (2157) can be switched to be connected to the buffer throttle valve (2153) or to be connected to the external pressure gas source, the valve port of the buffer throttle valve (2153) is connected to the atmosphere, and the backwash trigger (2154) is connected to the reversing valve (2152) and the sample switch valve (214).

7. The TOC online analysis system according to claim 1, characterized in that: The sampling module (1) comprises a sampling interface (11), a sampling tube (12) and a sampling flow control valve (13); the sampling interface (11) is connected to a connection port on the sample channel (4); the sampling tube (12) is arranged on the sampling interface (11), and an inlet bevel is arranged at the end thereof; the end of the sampling tube (12) is located in the sample channel (4), and the inlet bevel is away from the flow direction of the sample in the sample channel (4); the sampling flow control valve (13) is arranged between the sampling tube (12) and the pretreatment module (2), and the sampling flow control valve (13) and the pretreatment module (2) are connected via an integrated thermal insulation pipe cable.

8. The TOC online analysis system according to claim 7, characterized in that: The sampling flow control valve (13) is a speed regulating valve.

9. The TOC online analysis system according to any one of claims 1 to 8, characterized in that: The analytical cabinet (5) is provided with a sample detection interface (51), a sample discharge interface (52), a cooling water input interface (53) and a cooling water output interface (54); the sampling module (1) is arranged outside the analytical cabinet (5) and connected to the outer end of the sample detection interface (51); the pretreatment module (2) and the detection module (3) are arranged inside the analytical cabinet (5); the bypass unit (21) is connected to the inner end of the sample detection interface (51) and the sample discharge interface (52); The heat exchanger (221) is connected to the cooling water input interface (53) and the cooling water output interface (54), respectively. The detection module (3) includes a TOC analyzer (31), and the TOC analyzer (31) is provided with a sample introduction interface (311) and a sample recovery interface (312). The sample introduction interface (311) is connected to the pretreatment module (2), and the sample recovery interface (312) is connected to the sample discharge interface (52).

10. The TOC online analysis system according to claim 9, characterized in that: The detection module (3) further includes a purge unit (32), the purge unit (32) including a purge switch valve (321) and a purge pressure reducing valve (322). The analysis cabinet (5) is further provided with an instrument air interface (55), the purge switch valve (321) is connected to the instrument air interface (55), and the purge pressure reducing valve (322) is connected between the purge switch valve (321) and the TOC analyzer (31).

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