A TOC online analysis system

Abstract

The application relates to a TOC online analysis system, which relates to the field of online analysis equipment and comprises a sampling module, a pretreatment module and a detection module, the sampling module is connected with a sample channel, the pretreatment module is connected with the sampling module and the detection module respectively, the pretreatment module comprises a bypass unit, a temperature reduction unit, a pressure reduction valve, a flow control unit and a filter, the bypass unit is connected between the sampling module and the temperature reduction unit, the temperature reduction unit comprises a heat exchanger, a cooling water flow regulating valve and a temperature sensor, the 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 regulating valve is arranged on a cooling water pipeline of the heat exchanger, the through flow of the cooling water flow regulating valve can be adjusted according to the detection result of the temperature sensor, the pressure reduction valve, the flow control unit and the filter are arranged between the temperature sensor and the detection module, and the accuracy of online detection of the TOC of a detection sample can be ensured.

Description

TECHNICAL FIELD

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

[0002] TOC is the detection of Total Organic Carbon, which means total organic carbon, and is the sum of the carbon content in organic matter in water. All organic matter is composed of organic carbon, and the TOC in water can reflect the degree of organic pollution in water, therefore, TOC analysis has become the main means for water quality monitoring and water treatment quality control in many countries in the world. In addition, TOC determination is needed in drinking water supply, pharmaceuticals, food, semiconductor industry, waste humification degree analysis, carbon flux analysis of aquatic systems, determination of soil carbon content, and carbon cycle of soil.

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

[0004] The existing TOC online analysis system has high requirements for the detection sample, and has high requirements for the temperature, pressure, flow rate, etc. of the detection sample. Especially when TOC detection is performed on industrial wastewater, the industrial wastewater usually has high temperature and high pressure, which can easily cause the temperature, pressure, flow rate, etc. of the water sample to exceed the required values of the analyzer, affecting the detection accuracy of the TOC analyzer. SUMMARY

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

[0006] The TOC online analysis system provided by the present application adopts the following technical scheme:

[0007] The application discloses a TOC online analysis system which comprises a sampling module, a pretreatment module and a detection module, the sampling module is connected with an external sample channel, the pretreatment module is connected with the sampling module and the detection module respectively, so that the detection sample extracted by the sampling module can be pretreated and then delivered to the detection module for TOC detection, the pretreatment module comprises a bypass unit, a temperature reduction unit, a pressure reduction valve, a flow control unit and a filter, the bypass unit is connected between the sampling module and the temperature reduction unit, so as to provide a shunt path for part of the detection sample, the temperature reduction unit comprises a heat exchanger, a cooling water flow adjusting valve and a temperature sensor, the sample inlet of the heat exchanger is connected with the bypass unit, the temperature sensor is arranged on the sample outlet pipeline of the heat exchanger, the cooling water flow adjusting valve is arranged on the cooling water pipeline of the heat exchanger, and the flow of the cooling water can be adjusted according to the detection result of the temperature sensor, and the pressure reduction valve, the flow control unit and the filter are arranged on the connecting pipelines between the temperature sensor and the detection module respectively.

[0008] By adopting the above technical scheme, the pretreatment module comprising the bypass unit, the temperature reduction unit, the pressure reduction valve, the flow control unit and the filter is used to adjust the temperature, the pressure and the flow of the detection sample, and remove the particulate matters in the detection sample which affect the detection result, so as to ensure the TOC detection precision of the detection module and prevent the detection sample parameters from exceeding the requirements of the detection module and damaging the detection module; the temperature sensor arranged on the sample outlet pipeline of the heat exchanger and the cooling water flow adjusting valve arranged on the cooling water pipeline of the heat exchanger can adjust the flow of the cooling water flow adjusting valve according to the detection result of the temperature sensor, so as to reduce the consumption of the cooling water while ensuring the stability of the sample outlet temperature of the heat exchanger.

[0009] In a specific embodiment, the temperature reduction unit further comprises a flow indicator arranged on the cooling water pipeline of the heat exchanger, so as to indicate the flow of the cooling water in the cooling water pipeline of the heat exchanger and the size of the cooling water flow.

[0010] By adopting the above technical scheme, the flow indicator arranged on the cooling water pipeline of the heat exchanger can indicate the flow of the cooling water on the cooling water pipeline, so as to find the interruption of the water flow in the cooling water pipeline in time and avoid the damage of the detection instrument caused by the too high temperature of the detection sample.

[0011] In one specific implementation, the flow indicator comprises 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 internally provided with a cooling water flow channel, 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 correspondingly arranged with the permanent magnet, and the light-emitting element is connected to both ends of the induction coil.

[0012] By using the above technical solution, the permanent magnet arranged on the impeller can generate a changing magnetic field when the impeller rotates, generate an induced electromotive force associated with the cooling water flow size in the induction coil, drive the light-emitting element connected to both ends of the induction coil to emit light, thereby prominently displaying the flow of the cooling water and the size of the flow, and forming an abnormal alarm signal, which is beneficial to improve the effectiveness of the cooling water flow monitoring.

[0013] In one specific implementation, the bypass unit comprises a Y-type filter, a bypass flow valve and a sample discharge pipeline, the inlet of the Y-type filter is connected with the sampling module, the outlet is connected with the cooling unit, the blowdown port is connected with the bypass flow valve, and the bypass flow valve is connected with the sample discharge pipeline.

[0014] By using the above technical solution, the Y-type filter with the inlet connected with the sampling module, the outlet connected with the cooling unit and the blowdown port connected with the bypass flow valve can preliminarily filter a part of the detection sample from the sampling module and then deliver it to the cooling unit for further cooling treatment, and another part of the unfiltered detection sample is discharged through the blowdown port and delivered to the sample discharge pipeline through the bypass flow valve for discharge, so that the flow of the detection sample flowing to the detection module is adapted to the detection needs of the detection module, the real-time detection of the detection unit is improved, and the working burden of the cooling unit, the pressure reducing valve, the flow control unit and the filter is reduced; the bypass flow valve arranged between the blowdown port and the sample discharge pipeline can adjust the flow of the detection sample flowing to the sample discharge pipeline through the blowdown port, thereby conveniently adjusting the flow of the detection sample flowing to the detection unit.

[0015] In one specific implementation, the bypass unit further comprises a sample switch valve and a backwashing device, the sample switch valve is arranged on the inlet pipeline of the Y-type filter, and the backwashing device is arranged on the outlet pipeline of the Y-type filter, so as to intermittently backwash the Y-type filter.

[0016] By adopting the technical scheme, the backwashing device arranged on the outlet pipeline of the Y-type filter can discharge the detection sample into the pipeline after the sample switch valve is intermittently closed, so that the detection sample flows reversely to the blowdown port through the outlet of the Y-type filter, the filter screen of the Y-type filter is backwashed, solid impurities attached to the filter screen are removed, and the filtering performance of the Y-type filter is restored.

[0017] In a specific implementable scheme, the backwashing device comprises a backwashing buffer cylinder, a reversing valve, a buffer throttle valve and a backwashing trigger, the backwashing buffer cylinder is internally provided with a buffer piston, a sample inlet and outlet is arranged on one side of the backwashing buffer cylinder, a gas inlet and outlet is arranged on the other side of the backwashing buffer cylinder, the sample inlet and outlet is connected with the outlet pipeline of the Y-type filter, the gas inlet and outlet is connected with the reversing valve, the reversing valve is connected with the buffer throttle valve and an external pressure gas source, so as to switch the gas inlet and outlet to be connected with the buffer throttle valve or the external pressure gas source, the valve port of the buffer throttle valve is communicated with the atmosphere, and the backwashing trigger is connected with the reversing valve and the sample switch valve.

[0018] By adopting the technical scheme, the backwashing buffer cylinder with the sample inlet and outlet connected with the outlet pipeline of the Y-type filter and the gas inlet and outlet connected with the reversing valve can continuously store a small amount of detection sample in the backwashing buffer cylinder under the control of the reversing valve, and rapidly discharge the detection sample into the outlet pipeline of the Y-type filter in a short time to intermittently flush the filter screen of the Y-type filter; the reversing valve connected with the buffer throttle valve and the external pressure gas source can switch the gas inlet and outlet to be connected with the buffer throttle valve, so as to slowly discharge the gas in the backwashing buffer cylinder, so that the detection sample slowly enters the backwashing buffer cylinder, or switch the gas inlet and outlet to be connected with the external pressure gas source, so as to rapidly introduce the external pressure gas into the backwashing buffer cylinder to rapidly discharge the detection sample in the backwashing buffer cylinder to backwash the filter screen of the Y-type filter; the backwashing trigger can control the interval time of backwashing of the Y-type filter, and synchronize the switching action of the reversing valve with the opening and closing of the sample switch valve.

[0019] In a specific implementable scheme, the sampling module comprises a sampling interface, a sampling tube and a sampling flow control valve, the sampling interface is connected with the connecting port on the sample channel, the sampling tube is arranged on the sampling interface and is provided with an inlet slope at the end, the end of the sampling tube is located in the sample channel, and the inlet slope 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 with the pretreatment module through an integrated heat preservation cable.

[0020] By adopting the technical scheme, the sampling tube with the end inlet slope facing away from the sample flow direction in the sample channel can reduce the influence of the sample flow rate in the sample channel on the detection sample collection amount of the sampling module, and ensure the stability of the detection sample collection amount; the sampling flow control valve arranged between the sampling tube and the pretreatment module can preliminarily control the flow of the detection sample collected by the sampling module, and ensure that the detection sample collection amount is within the change range of the transmission parameters in the sample channel, which can meet the needs of TOC detection.

[0021] In a specific implementation, the sampling flow control valve is a speed regulating valve.

[0022] By adopting the technical scheme, the speed regulating valve as the sampling flow control valve can reduce the influence of the sample pressure in the sample channel on the detection sample collection amount, and improve the stability of the detection sample collection amount.

[0023] In a specific implementation, the TOC online analysis system further comprises an analysis cabinet, wherein the analysis cabinet 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 connected to the outer side end of the detection sample interface; the pretreatment module and the detection module are arranged in the analysis cabinet; the bypass unit is connected to the inner side end of the detection sample interface and the sample discharge interface; the cooling water pipeline of the heat exchanger is connected to the cooling water input interface and the cooling water output interface respectively; and the detection module comprises a TOC analyzer, wherein 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.

[0024] By adopting the technical scheme, the pretreatment module and the detection module are arranged in the analysis cabinet, which can form isolation of the pretreatment module and the detection module from the external environment, and is conducive to maintaining the stability of the environment of the detection sample and the detection module, thereby ensuring the detection precision of the TOC content in the detection sample; the detection sample collected by the sampling module outside the analysis cabinet can be conveniently transported into the analysis cabinet through the detection sample interface arranged on the analysis cabinet, and after being processed by the pretreatment module, the detection sample is sent to the detection module for TOC content detection; the sample discharge interface arranged on the analysis cabinet is connected to the external sample processing device, and the detection sample discharged through the bypass and the detection sample after detection by the detection module are discharged; the cooling water input interface and the cooling water output interface arranged on the analysis cabinet are connected to the external circulating cooling water source, and the external circulating cooling water is introduced to cool the detection sample.

[0025] In one specific implementation, the detection module further comprises a purge unit, the purge unit comprising a purge switch valve and a purge pressure reducing valve, and the analysis cabinet is further provided with an instrument air interface, the purge switch valve being connected to the instrument air interface, and the purge pressure reducing valve being connected between the purge switch valve and the TOC analyzer.

[0026] By using the above technical solution, the purge switch valve connected to the instrument air interface can control the on-off of the instrument air from the outside, so as to control 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 control the pressure and flow of the instrument air entering the TOC analyzer, so as to discharge the detection exhaust gas in the TOC analyzer, improve the working safety of the TOC analyzer, and ensure the stability of the working temperature of the TOC analyzer.

[0027] In summary, the present application has at least one of the following beneficial technical effects:

[0028] By arranging the temperature sensor on the sample outlet pipeline of the heat exchanger and the cooling water flow regulating valve on the cooling water pipeline of the heat exchanger, the temperature of the detection sample after heat exchange in the heat exchanger can be detected, and the flow of the cooling water flow regulating valve can be adjusted according to the temperature of the detection sample after heat exchange, so as to ensure the stability of the temperature of the detection sample flowing out of the sample outlet of the heat exchanger, and ensure that the cooling water flow is adapted to the cooling demand of the detection sample, thereby reducing the consumption of cooling water.

[0029] By arranging the permanent magnet on the impeller of the flow indicator, the permanent magnet can rotate with the flow of the detection sample in the flow indicator, a changing magnetic field is generated outside the flow indicator, the change speed of the magnetic field is proportional to the flow of the detection sample, an induced electromotive force proportional to the flow of the detection sample is generated in the induction coil, the light-emitting element is driven to emit light, and the luminance of the light-emitting element is positively correlated with the flow of the detection sample, so that the flow of the detection sample can be prominently prompted by the luminance of the light-emitting element.

[0030] By arranging the backflushing device on the outlet pipeline of the Y-shaped filter, the sample inlet and outlet of the backflushing buffer cylinder are connected to the outlet pipeline of the Y-shaped filter. During normal detection, the detection sample enters the backflushing buffer cylinder through the sample inlet and outlet, the entering speed of the detection sample is controlled by the buffer throttle valve, so that a small amount of detection sample slowly enters the backflushing buffer cylinder. During backflushing, external pressure gas is quickly introduced into the backflushing buffer cylinder to push the detection sample in the backflushing buffer cylinder to flow out quickly, so as to perform intermittent backflushing on the Y-shaped filter and ensure the filtering performance of the Y-shaped filter. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1The schematic diagram of one embodiment of the present application.

[0032] Figure 2 The schematic diagram of the flow indicator structure in one embodiment of the present application.

[0033] Figure 3 The schematic diagram of the backwashing device in one embodiment of the present application.

[0034] Figure 4 The schematic diagram of the analysis cabinet part structure in one embodiment of the present application.

[0035] Legend: 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, backwashing device; 2151, backwashing buffer cylinder; 2152, reversing valve; 2153, buffer throttle valve; 2154, backwashing trigger; 2155, buffer piston; 2156, sample inlet and outlet; 2157, gas inlet and outlet; 22, temperature reduction unit; 221, heat exchanger; 222, cooling water flow regulating valve; 223, temperature sensor; 224, flow indicator; 2241, indicator shell; 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 switch 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

[0036] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely intended to illustrate and explain the present application, and are not intended to limit the present application.

[0037] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "arranged", "connected" should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or integrally connected; can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0038] One embodiment of the TOC online analysis system of the present application, as shown in Figure 1 includes a sampling module 1, a pretreatment module 2 and a detection module 3. The sampling module 1 is connectable with an external sample channel 4 for extracting a detection sample 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 a river water body to be monitored, product pure water samples extracted from a pure water production line, heat exchanger water samples extracted from an industrial production line, etc. Depending on the detection target, the detection sample has 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 sample is usually much greater than the needs of the pretreatment module 2 for online detection.

[0039] The pretreatment module 2 is connected between the sampling module 1 and the detection module 3, and is used to pretreat the detection sample extracted by the sampling module 1, such as cooling, decompressing, flow limiting, filtering, etc. of the detection sample, so that the temperature, pressure, flow rate and solid impurities contained in the detection sample meet the sample inlet requirements of the analyzer, and the pretreated detection sample is delivered to the detection module 3 for TOC detection, so as to ensure that the analyzer in the detection module 3 can operate normally and provide accurate analysis results.

[0040] The pretreatment module 2 includes a bypass unit 21, a cooling unit 22, a decompression 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 passage on the output pipeline of the sampling module 1, so that part of the detection sample extracted by the sampling module 1 flows out directly through the shunt passage, thereby reducing the flow rate of the detection sample transmitted to the cooling unit 22, so that the flow rate of the detection sample transmitted to the detection module 3 is adapted to the detection needs of the detection module 3.

[0041] The cooling unit 22 includes a heat exchanger 221, a cooling water flow rate adjusting valve 222 and a temperature sensor 223. The heat exchanger 221 can use various types of suitable heat exchangers, such as a shell-and-tube heat exchanger, a tube-in-tube heat exchanger and a plate heat exchanger, etc. The heat exchanger 221 includes a sample passage and a cooling water passage which are isolated from each other. The sample inlet of the heat exchanger 221 is connected with 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 with an external cooling water source, and the cooling water outlet is connected with an external recovery water tank. The cooling water in the external cooling water source is driven by a water pump to enter the cooling water passage of the heat exchanger 221, and cools the detection sample flowing through the sample passage.

[0042] The cooling water flow regulating valve 222 is arranged on the cooling water pipeline of the heat exchanger 221, and can be arranged at the cooling water inlet end of the heat exchanger 221 or 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. Generally, the cooling water flow regulating valve 222 and the temperature sensor 223 are connected to the controller of the online analysis system. The controller sends a control signal to adjust the valve opening size of the cooling water flow regulating valve 222 according to the detection result of the temperature sensor 223, so as to control the flow rate of the cooling water passing through the cooling water flow regulating valve 222, that is, the amount of heat taken away from the test sample, and maintain the temperature of the test sample after heat exchange by the heat exchanger 221 at a set level.

[0043] The pressure reducing valve 23, the flow control unit 24 and the filter 25 are arranged in sequence 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 that can be received by the detection module 3. The flow control unit 24 can use a rotor flowmeter with flow regulating function, such as the DK800 rotor flowmeter of the KOLON company. The flow control unit 24 can regulate the flow rate of the test sample to a size required by the detection module 3. The filter 25 can use a micron-level filter to filter out solid impurities in the test sample, so as to prevent the solid impurities from depositing in the detection module 3 and affecting the normal work of the detection module 3.

[0044] In some embodiments of the TOC online analysis system of the present application, as shown in Figure 1 A flow indicator 224 is further arranged in the cooling unit 22. The flow indicator 224 can use various devices capable of indicating the flow state of fluid, such as a vane sight flow indicator. The flow indicator 224 is arranged on the cooling water pipeline of the heat exchanger 221. When the cooling water pipeline has cooling water flowing therein, the indication part of the flow indicator 224 can observe the flow state of the cooling water, such as observing the rotation of the vane through the sight. The rotation speed of the vane is proportional to the flow rate of the cooling water. In this way, the flow indicator 224 can know whether the cooling water pipeline of the heat exchanger 221 has cooling water flowing therein and the size of the cooling water flow rate. This avoids the abnormal supply of cooling water due to the failure of the cooling water source or the cooling water pipeline, which causes the abnormal increase of the temperature of the test sample and damages the TOC analysis instrument.

[0045] In a preferred embodiment of the TOC online analysis system of the present application, as shown in Figure 1 and Figure 2As shown, 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 inside of the indicator housing 2241 is provided with a cooling water flow channel, and 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 from the cooling water flow channel inside the indicator housing 2241. The impeller 2242 is rotatably arranged in the cooling water flow channel, and can be driven to rotate when the cooling water flows in the cooling water flow channel. The permanent magnet 2243 is arranged at the edge portion of the impeller 2242, and can be driven to rotate together with the impeller 2242 when the impeller 2242 rotates.

[0046] The induction coil 2244 is arranged outside the cooling water flow channel of the indicator housing 2241, and a core can also be arranged in the induction coil 2244. The induction coil 2244 is arranged on the rotation path of the permanent magnet 2243, so that one end of the core corresponds to the rotation track of the permanent magnet 2243. When the permanent magnet 2243 passes from the end of the induction coil 2244, the magnetic field strength passing through the induction coil 2244 changes, and an induced electromotive force is generated in the induction coil 2244. The light emitting element 2245 usually uses an LED light emitting circuit, and a plurality of LEDs can be arranged in the LED light emitting circuit. The light emitting element 2245 is connected to both ends of the induction coil 2244, and the LED flashes and emits light as the permanent magnet 2243 passes through the corresponding position of the induction coil 2244 each time. The light emitting frequency and light emitting intensity are positively correlated with the rotation speed of the impeller 2242, i.e., the flow speed of the cooling water.

[0047] In this way, the light emitted by the light emitting element 2245 can clearly indicate the flow state of the cooling water, which is beneficial for the staff to timely find the abnormal state of the cooling water flow channel, avoid the staff's negligence to cause the cooling water flow state to be abnormal and not be found, and better ensure the safety of the TOC analyzer.

[0048] In some embodiments of the TOC online analysis system of the present application, as Figure 1As shown, the bypass unit 21 comprises a Y-type filter 211, a bypass flow valve 212 and a sample discharge pipeline 213. The Y-type filter 211 can use various suitable commercial components, the inlet of the Y-type filter 211 is connected with the sampling module 1, and the outlet is connected with the cooling unit 22, part of the detection sample collected by the sampling module 1 flows to the cooling unit 22 after being filtered by the Y-type filter 211. The blowdown port of the Y-type filter 211 is connected with the bypass flow valve 212, the bypass flow valve 212 is connected with the sample discharge pipeline 213, part of the detection sample collected by the sampling module 1 flows to the sample discharge pipeline 213 through the blowdown port of the Y-type filter 211 and the bypass flow valve 212, forming a discharge bypass of the detection sample. The sample discharge pipeline 213 is connected with an external sample processing device, and the detection sample discharged through the discharge bypass is discharged after being processed by the sample processing device.

[0049] The bypass flow valve 212 can adjust the flow of the detection sample discharged through the discharge bypass, thereby indirectly adjusting the flow of the detection sample transported through the outlet of the Y-type filter 211 to the cooling unit 22 and ultimately to the detection module 3, ensuring that the flow of the detection sample transported to the detection module 3 is adapted to the detection needs of the detection module 3.

[0050] In a preferred embodiment of the TOC online analysis system of the present application, as shown in Figure 1 and Figure 3 As shown, the bypass unit 21 further comprises a sample switch valve 214 and a backflushing device 215. The sample switch valve 214 is arranged on the inlet pipeline of the Y-type filter 211, and the backflushing device 215 is arranged on the outlet pipeline of the Y-type filter 211. The backflushing device 215 can intermittently inject backflushing liquid into the outlet pipeline of the Y-type filter 211 to intermittently backflush the filter screen in the Y-type filter 211.

[0051] The sample switch valve 214 is closed when the backflushing device 215 backflushes the Y-type filter 211, which on the one hand prevents the backflushing liquid injected by the backflushing device 215 from flowing to the inlet end of the Y-type filter 211, affecting the accuracy of the TOC detection result of the detection sample, and on the other hand reduces the pressure at the inlet end of the Y-type filter 211, which is beneficial to the backflushing liquid flowing reversely through the filter screen inside the Y-type filter 211, flowing out through the blowdown port of the Y-type filter 211, and being discharged through the discharge bypass. The pressure reducing valve 23 can prevent a large amount of backflushing liquid from flowing to the detection module 3 in a short time. The backflushing liquid injected during backflushing will inevitably affect the TOC detection result of the detection module 3 in a short time, so the detection result of the detection module 3 can be shielded during the backflushing period.

[0052] As a specific embodiment of the TOC online analysis system of the present application, as shown in Figure 1 andFigure 3 As shown, the backflushing device 215 includes a backflushing buffer cylinder 2151, a reversing valve 2152, a buffer throttle valve 2153 and a backflushing trigger 2154. The inside of the backflushing buffer cylinder 2151 is provided with a piston cavity, and a buffer piston 2155 is arranged in the piston cavity and is capable of sliding in the piston cavity. A piston rod can or can not be arranged on the buffer piston 2155, and when the piston rod is arranged, the piston rod extends out through the end cylinder of the backflushing buffer cylinder 2151. The piston rod can ensure the position stability when the buffer piston 2155 slides.

[0053] A sample inlet and outlet 2156 is arranged on the backflushing buffer cylinder 2151 on the side of the buffer piston 2155, and the sample inlet and outlet 2156 is connected with the outlet pipeline of the Y-type filter 211. The detection sample flowing out of the outlet pipeline of the Y-type filter 211 can enter the backflushing buffer cylinder 2151 through the sample inlet and outlet 2156, and the detection sample in the backflushing buffer cylinder 2151 can also flow into the outlet pipeline of the Y-type filter 211 through the sample inlet and outlet 2156.

[0054] A gas inlet and outlet 2157 is arranged on the backflushing buffer cylinder 2151 on the other side of the buffer piston 2155, and the gas inlet and outlet 2157 is connected with one oil port of the reversing valve 2152. The other two oil ports of the reversing valve 2152 are respectively connected with the buffer throttle valve 2153 and an external pressure gas source. By controlling the action of the reversing valve 2152, the gas inlet and outlet 2157 can be switched to be connected in communication with the buffer throttle valve 2153 through the internal flow channel of the reversing valve 2152, or be connected in communication with the external pressure gas source through the internal flow channel of the reversing valve 2152.

[0055] The valve port of the buffer throttle valve 2153 is connected with the atmosphere. When the gas inlet and outlet 2157 is connected in communication with the buffer throttle valve 2153, the detection sample in the outlet pipeline of the Y-type filter 211 is pushed by the pipeline pressure to enter the backflushing buffer cylinder 2151 on the side of the buffer piston 2155 through the sample inlet and outlet 2156, and the buffer piston 2155 is pushed to slide to the side of the gas inlet and outlet 2157. The gas pressure in the backflushing buffer cylinder 2151 on the other side of the buffer piston 2155 increases, and the gas is discharged to the atmosphere through the buffer throttle valve 2153. The buffer throttle valve 2153 can control the flow rate of the gas discharged to the atmosphere, so as to control the speed of the detection sample in the outlet pipeline of the Y-type filter 211 entering the backflushing buffer cylinder 2151, and reduce the influence on the flow rate of the detection sample transmitted to the detection module 3.

[0056] When the gas outlet 2157 is connected to the external pressure gas source, the pressure gas in the external pressure gas source enters the backwash buffer cylinder 2151 through the gas outlet 2157 quickly. Since the sample switch valve 214 is closed at this time, the pressure of the external pressure gas source is much greater than the pressure of the detection sample in the outlet pipeline of the Y-type filter 211, and the pressure gas pushes the buffer piston 2155 to slide quickly to the side of the sample outlet 2156, pushing the detection sample in the backwash buffer cylinder 2151 to enter the outlet pipeline of the Y-type filter 211 quickly, and then being discharged through the blowdown port of the Y-type filter 211, the bypass flow valve 212 and the sample discharge pipeline 213 to backwash the filter screen in the Y-type filter 211.

[0057] The backwash trigger 2154 can use various trigger devices capable of intermittently controlling the reversing valve 2152 to generate a reversing action, such as a timer. The backwash trigger 2154 is connected to the reversing valve 2152 and the sample switch valve 214. The timer can be used to generate a trigger signal at a certain time to drive the reversing valve 2152 and the sample switch valve 214 to act synchronously, i.e., to switch the gas outlet 2157 to be connected to the external pressure gas source while closing the sample switch valve 214.

[0058] Two piston position sensors can also be arranged at different positions of the backwash buffer cylinder 2151 as the backwash trigger 2154. The piston position sensors can generate a trigger signal when the buffer piston 2155 moves to a corresponding position. When the buffer piston 2155 moves to the position of the first piston position sensor close to the end of the gas outlet 2157, the first piston position sensor generates a trigger signal to control the reversing valve 2152 to act so that the gas outlet 2157 is connected to the external pressure gas source, and to control the sample switch valve 214 to be closed to backwash the Y-type filter 211. At this time, the buffer piston 2155 moves quickly to the direction of the sample outlet 2156, and when the buffer piston 2155 moves to the position of the second piston position sensor close to the end of the sample outlet 2156, the second piston position sensor generates a trigger signal to control the reversing valve 2152 to act so that the gas outlet 2157 is connected to the buffer throttle valve 2153, and the gas in the backwash buffer cylinder 2151 is slowly discharged to the atmosphere through the buffer throttle valve 2153; and to control the sample switch valve 214 to be opened so that part of the detection sample flows out through the outlet of the Y-type filter 211 and slowly enters the backwash buffer cylinder 2151 through the sample outlet 2156, pushing the buffer piston 2155 to move slowly to the side of the gas outlet 2157, while part of the detection sample flows to the cooling unit 22 and is transported to the detection module 3 for TOC detection after being pretreated.

[0059] The gas flow rate through the buffer throttle valve 2153 determines the flow rate of the detection sample into the sample inlet and outlet 2156, and determines the time for the 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, which is the backflush interval. Therefore, by controlling the flow rate through the buffer throttle valve 2153, the interval between two backflushes can be controlled.

[0060] In some embodiments of the TOC online analysis system of the present application, as shown in Figure 1 The sampling module 1 includes a sampling interface 11, a sampling tube 12 and a sampling flow control valve 13. The sampling interface 11 is a connecting interface adapted to the connecting port on the sample channel 4 for sample collection. The sampling tube 12 is arranged on the sampling interface 11, and the end of the sampling tube 12 is located in the sample channel 4 when the sampling interface 11 is connected to the connecting port on the sample channel 4. An inlet slope is arranged on the end of the sampling tube 12, and the end of the sampling tube 12 is located in the sample channel 4 such that the inlet slope of the end of the sampling tube 12 faces away from the flow direction of the sample in the sample channel 4, i.e. faces towards the downstream direction of the sample flow in the sample channel 4.

[0061] 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 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 heat preservation cable. The flow rate of the detection sample flowing into the pretreatment module 2 through the sampling tube 12 can be preliminarily controlled through the sampling flow control valve 13. The integrated heat preservation cable can isolate the detection sample in the cable from the external environment, so as to prevent the detection sample at high temperature from scalding the person in contact with it, and prevent the detection sample at room temperature from solidifying in a cold environment to affect the transmission of the detection sample.

[0062] In a preferred embodiment of the TOC online analysis system of the present application, the sampling flow control valve 13 is a speed regulating valve. The use of the speed regulating valve can reduce the influence of the pressure change of the sample in the sample channel 4 on the flow rate of the detection sample delivered to the pretreatment module 2, and ensure the relative stability of the flow rate of the detection sample delivered to the pretreatment module 2.

[0063] In some embodiments of the TOC online analysis system of the present application, as shown in Figure 1 and Figure 4As shown, the TOC online analysis system of the present application further comprises an analysis cabinet 5. A detection sample interface 51, a sample discharge interface 52, a cooling water input interface 53 and a cooling water output interface 54 are respectively arranged on the side wall of the analysis cabinet 5. The sampling module 1 is arranged outside the analysis cabinet 5, and the pipeline for conveying the detection sample of the sampling module 1 is connected to the connecting end of the detection sample interface 51 located outside the analysis cabinet 5.

[0064] The pretreatment module 2 and the detection module 3 are arranged in the analysis cabinet 5, and the analysis cabinet 5 forms an isolation from the external space. The inlet of the bypass unit 21 is connected to the inside end of the detection sample interface 51, and the bypass output of the bypass unit 21 is connected to the sample discharge interface 52. The detection sample discharged through the bypass flows out through the sample discharge interface 52 and is conveyed to an external sample treatment device for treatment and discharge after the detection sample is treated.

[0065] The detection module 3 comprises a TOC analyzer 31. The TOC analyzer 31 is a commercially available TOC analyzer capable of continuously detecting the TOC of the detection sample. 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 is used to introduce the pretreated detection sample from the pretreatment module 2. The sample recovery interface 312 is connected to the sample discharge interface 52. The sample waste liquid after detection by the TOC analyzer 31 is discharged through the sample discharge interface 52 and is conveyed to an external sample treatment device for treatment and discharge.

[0066] In a preferred embodiment of the TOC online analysis system of the present application, as shown in Figure 1 and Figure 4 A purge unit 32 is further arranged in the detection module 3. The purge unit 32 comprises a purge on-off valve 321 and a purge pressure reducing valve 322, and an instrument air interface 55 is further arranged on the analysis cabinet 5. The purge on-off valve 321 is connected to the instrument air interface 55. The outside end of the instrument air interface 55 is connected to an external high-pressure instrument air source. The inlet of the purge pressure reducing valve 322 is connected to the purge on-off valve 321 through a pipeline, and the outlet is connected to the inside of the casing of the TOC analyzer 31 through a pipeline.

[0067] When the purge switch valve 321 is opened, the high pressure instrument air from outside can be delivered to the purge pressure reducing valve 322, and after pressure reduction by the purge pressure reducing valve 322, delivered into the TOC analyzer 31 to purge the detection exhaust gas inside the TOC analyzer 31, reduce the concentration of the detection exhaust gas in the TOC analyzer 31, ensure the safety of the internal environment of the TOC analyzer 31, and also discharge the heat in the TOC analyzer 31 to reduce the internal temperature of the TOC analyzer 31. The purge pressure reducing valve 322 can reduce the purge speed and flow of the instrument air in the TOC analyzer 31, and ensure the stability of the detection environment in the TOC analyzer 31.

[0068] In the description of the present application, the description of the terms "one embodiment", "a specific embodiment", "a preferred embodiment", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are contained in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0069] The above are the preferred embodiments of the present application, which do not limit the protection scope of the present application, therefore: any equivalent changes made on the structure, shape, principle of the present application should be covered within the protection scope 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); The bypass unit (21) includes a Y-type filter (211), a bypass flow valve (212), a sample discharge pipeline (213), a sample switch valve (214) and a backwashing device (215), 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), the bypass flow valve (212) is connected to the sample discharge pipeline (213), the sample switch 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); 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).

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 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.

5. The TOC online analysis system according to claim 4, characterized in that: The sampling flow control valve (13) is a speed regulating valve.

6. The TOC online analysis system according to any one of claims 1 to 5, 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).

7. The TOC online analysis system according to claim 6, 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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