Pretreatment device of on-line gas analyzer

Abstract

The utility model provides a pretreatment device of a gas on-line analyzer, which comprises a plurality of sample gas distribution pipes used for conveying sample gas and arranged in parallel and a standard gas distribution pipe used for conveying standard gas, and gas outlet ports of the sample gas distribution pipes and the standard gas distribution pipe are connected with the analyzer. The sample gas distribution pipe is provided with a manual stop valve for manually and directly controlling the sample gas distribution pipe, a first automatic regulating valve for automatically controlling the sample gas distribution pipe, a sampling pump for providing power for gas delivery, a pressure reducing valve for regulating the pressure of the sample gas, a filter for removing impurities in the sample gas and a dehydrator for drying the sample gas; and the first automatic regulating valve and the analyzer are both connected with the control unit. According to the pretreatment device of the gas online analyzer, multi-point sampling is realized, samples are pretreated, the measurement requirement is met, and the measurement is accurate.

Description

Technical Field

[0001] The utility model belongs to the field of gas analysis, and in particular relates to a preprocessing device for a gas online analyzer. Background Art

[0002] An online gas analyzer is a high-precision measurement device used in chemical production processes, designed to continuously or periodically monitor the chemical composition or physical properties of a substance. Online gas analyzers play an indispensable role in modern industry. They are widely used in the chemical, petroleum, pharmaceutical, food, wastewater treatment, and other fields, providing fast, accurate, real-time data to ensure process stability and improve product quality. The analyzer is preceded by a pretreatment unit that extracts a representative sample from the production process and performs the necessary pretreatment to ensure it meets the analyzer's requirements for sample state or condition. Currently, most analyzers use single-point sampling, with the sampling valve installed directly on the online analyzer. This makes multi-point sampling and online analysis impossible. Implementing multi-point sampling requires purchasing a new analyzer, which is costly. Direct piping connected to the analyzer can be affected by unstable flow rates and pressures, resulting in poor sampling and measurement results due to low pressure. Simply drying the sampled gas fails to remove impurities, affecting measurement accuracy and contaminating the online analyzer's sensors, shortening the lifespan of the sensor probes and reducing their service life. Utility Model Content

[0003] In view of the problems existing in the prior art, the utility model provides a pretreatment device for a gas online analyzer, which realizes multi-point sampling and pretreatment of samples to meet measurement requirements and achieve accurate measurement.

[0004] The technical solutions adopted in this utility model are as follows:

[0005] A pretreatment device for a gas online analyzer comprises a multi-channel sample gas distribution pipe for conveying sample gas and arranged in parallel, and a standard gas distribution pipe for conveying standard gas. The gas outlet ports of the sample gas distribution pipe and the standard gas distribution pipe are both connected to the analyzer. The sample gas distribution pipe is provided with a manual stop valve for manually and directly controlling the sample gas distribution pipe, a first automatic regulating valve for automatically controlling the sample gas distribution pipe, a sampling pump for providing power for gas delivery, a pressure reducing valve for regulating the sample gas pressure, a filter for removing impurities in the sample gas, and a dehumidifier for drying the sample gas. The first automatic regulating valve and the analyzer are both connected to a control unit.

[0006] Furthermore, the control unit has data storage, logical operation and programming functions, which are used for data processing and information reception and output to realize central control. The control unit includes a PLC controller and a DCS controller. The information output end of the PLC controller is connected to the first automatic regulating valve and the DCS controller. The PLC controller is provided with a touch screen for displaying a human-computer interaction interface. The touch screen is provided with a manual control button and an automatic control button. Human-computer interaction is performed through the manual control button and the automatic control button. A plurality of cut-off buttons and open buttons are provided under the manual control button. A cut-off button and an open button are set as a group. Each group of cut-off buttons and open buttons controls a first automatic regulating valve. Multiple groups of cut-off buttons and open buttons are arranged in parallel to realize separate manual control of the first automatic regulating valve. A first automatic regulating valve control module is provided in the PLC controller. The first automatic regulating valve control module includes a manual control module and an automatic control module. The priority level of the manual control module is higher than that of the automatic control module. When the manual control module is in action, the automatic control module does not act.

[0007] The manual control module includes multiple manual control submodules arranged in parallel. The multiple manual control submodules correspond one-to-one to multiple first automatic regulating valves and multiple groups of cut-off buttons and open buttons. Each manual control submodule includes an opening module for controlling the opening of the first automatic regulating valve and a cut-off module for controlling the cut-off of the first automatic regulating valve. The opening module receives instruction information from the opening button, and the cut-off module receives instruction information from the cut-off button. Pressing the manual control button enters an interface displaying the opening button and the cut-off button. Pressing the opening button inputs an opening instruction. The opening module receives the opening instruction and sends it to the corresponding first automatic regulating valve. The first automatic regulating valve opens and sampling begins. Pressing the cut-off button in the same group inputs a cut-off instruction. The cut-off module receives the cut-off instruction and sends it to the first automatic regulating valve in the open state. The first automatic regulating valve is cut off and sampling stops. In this way, each first automatic regulating valve is manually controlled individually through the touch screen.

[0008] The automatic control module includes a plurality of automatic control submodules corresponding to the first automatic regulating valves. The automatic control module receives the instruction information of the automatic control button on the touch screen. Each automatic control submodule presets a sampling time (for example, 1-10 minutes), a cyclic sampling interval (15-60 minutes) and the number of cyclic samplings. The cyclic sampling interval set by each automatic control submodule is greater than the sum of the sampling times of all automatic control submodules to ensure that only one first automatic regulating valve is in the open state. The first automatic control submodule sends an open instruction to the first automatic regulating valve corresponding to it. The first automatic regulating valve receives the instruction and opens the first automatic regulating valve to start sampling. When the sampling time arrives, the first automatic control submodule sends a cut-off instruction to the first automatic regulating valve corresponding to it and sends information to the second automatic control submodule at the same time. The first automatic regulating valve receives the cut-off instruction, cuts off the first automatic regulating valve and stops sampling. The second automatic control submodule receives the information and determines whether the next sampling cycle has arrived (the second automatic control submodule does not make a determination when receiving the information for the first time. The time interval between the last sampling time and the time of receiving the information is compared with the preset cyclic sampling interval. The time interval between the last sampling time and the time of receiving the information is used to determine whether the next sampling cycle has arrived). If the interval is less than the preset cyclic sampling interval, it is determined that the next sampling interval has not arrived; if the time interval between the last sampling time and the received information is not less than the preset cyclic sampling interval, it is determined that the next sampling interval has arrived). If the next sampling interval has arrived, an action is taken. If the next sampling interval has not arrived, an action is taken when it is determined that the time interval between the last sampling time and the received information meets the cyclic sampling interval. The last automatic control submodule sends a cut-off instruction to the first automatic regulating valve corresponding thereto and simultaneously sends information to the first automatic control submodule. When a cyclic sampling interval ends, the first automatic control submodule receives the information and determines whether the next sampling interval has arrived and whether to start a second cyclic sampling. When the cyclic sampling number is met, the automatic control submodule stops sending instructions to the first automatic regulating valve. Pressing the automatic control button sends an automatic sampling instruction to the automatic control module. The automatic control module receives the instruction and sends it to the first automatic control submodule. The first automatic control submodule receives the instruction and sends it to the first automatic control valve corresponding thereto. The first automatic regulating valve receives the instruction and opens for sampling. After sampling is completed, information is sent to the second automatic control submodule. Sampling is performed in sequence. The first automatic regulating valve can be, for example, a solenoid valve.

[0009] Furthermore, the information input end of the PLC controller is connected to the analyzer, the PLC controller receives and stores the measurement data sent by the analyzer, and the PLC controller sends the measurement data to the DCS controller for display. The DCS controller is provided with a judgment unit and an alarm unit. The judgment unit presets an upper limit and a lower limit to determine the measurement result. When the measurement result is lower than the lower limit or higher than the upper limit, the judgment unit sends an instruction to the alarm unit, and the alarm unit executes the instruction to alarm, promptly reminding the process personnel to adjust the process. The alarm unit includes, for example, an alarm light and an alarm.

[0010] Furthermore, the sample gas distribution pipes are at least two, for example, 4-10, and the air inlet ports of the sample gas distribution pipes are arranged at different sampling positions, such as the liquid oxygen discharge port in the condenser evaporator of the air cooling device, the purifier inlet, the purifier outlet and the air intake of the air separation device and other positions where sampling is required. Each sample gas distribution pipe is provided with a manual shut-off valve and a first automatic regulating valve. A part of the sample gas distribution pipes (for example, the sample gas distribution pipes that need to be pressurized) merge into a first sample gas distribution main pipe, and the remaining sample gas distribution pipes (for example, the sample gas distribution pipes that need to be depressurized) merge into a second sample gas distribution main pipe. The first sample gas distribution main pipe and the second sample gas distribution main pipe are merged into a total sample gas distribution pipe and then connected to the analyzer, or all the sample gas distribution pipes are merged into a total sample gas distribution pipe and then connected to the analyzer. A connecting valve is provided at the junction of the sample gas distribution pipe, the first sample gas distribution main pipe and the second sample gas distribution main pipe. The connecting valve can be, for example, a three-way valve to realize the merging of multiple pipelines.

[0011] Furthermore, the sampling pump is arranged on the first sample gas distribution main pipe, and the pressure reducing valve is arranged on the second sample gas distribution main pipe. The power supply voltage of the sampling pump can be, for example, 220V, the power can be, for example, 0.06KW, and the pressure can be, for example, 250KPa.

[0012] Furthermore, the sampling pump, the pressure reducing valve and the water remover are sequentially arranged on the main sample gas distribution pipe along the sample gas conveying direction.

[0013] Furthermore, the total sample gas distribution pipe and the standard gas distribution pipe merge into a total air intake pipe, and the total air intake pipe is divided into a first branch pipe and a second branch pipe after passing through a first three-way automatic switching valve. The first three-way automatic switching valve is connected to the PLC controller, and the first branch pipe is connected to the exhaust port after passing through an exhaust flow meter and an exhaust valve in turn, and the second branch pipe is connected to the analyzer. A first switching valve is provided at the junction of the total sample gas distribution pipe and the standard gas distribution pipe. The first switching valve can be, for example, a three-way valve. The first switching valve is used to realize switching between sample gas and standard gas. When the sample gas needs to be measured, the sample gas port connected to the total sample gas distribution pipe through the first switching valve is opened. At this time, the standard gas port connected to the standard gas distribution pipe is closed, and the standard gas cannot enter. When calibrating the analyzer, the standard gas port connected to the standard gas distribution pipe through the first switching valve is opened. At this time, the sample gas port is closed, and the sample gas cannot enter. The analyzer is calibrated. The standard gas can be, for example, nitrogen.

[0014] Furthermore, the filter includes a mist filter arranged on the total sample gas distribution pipe, which is used to remove mist from the sample gas and impurities at the same time to protect the analyzer. Preferably, the mist filter is arranged upstream of the dehydrator, and the upstream is the position that first contacts the sample gas, that is, the sample gas first passes through the mist filter and then passes through the dehydrator. More preferably, the mist filter is arranged between the dehydrator and the pressure reducing valve.

[0015] Furthermore, a first manual regulating valve for manually adjusting the stable air pressure and a first pressure gauge for displaying the air pressure are provided in sequence along the sample gas delivery direction on the total sample gas distribution pipe between the water eliminator and the first switching valve. The first manual regulating valve manually controls the sample gas flow rate, and manually adjusts the sample gas pressure according to the pressure value displayed by the first pressure gauge.

[0016] Furthermore, a multi-stage filter for finely removing impurities, a second three-way automatic switching valve, a second automatic regulating valve, a first pressure gauge and a hygrometer are sequentially provided on the total sample gas distribution pipe between the water eliminator and the first switching valve along the sample gas delivery direction. The outlet of the second three-way automatic switching valve not connected to the total sample gas distribution pipe is connected to the pressure relief pipe to avoid gas accumulation in the multi-stage filter. A control valve is provided on the pressure relief pipe. The second three-way automatic switching valve, the second automatic regulating valve, the first pressure gauge and the hygrometer are all connected to the PLC controller. The first pressure gauge can be, for example, a remote pressure gauge. The first pressure gauge is used to monitor the air pressure of the total sample gas distribution pipe. The PLC controller adjusts the opening of the second automatic regulating valve through the pressure value transmitted by the first pressure gauge to stabilize the total sample gas distribution pipe pressure; the hygrometer sends the monitored sample gas humidity information to the PLC controller. When the humidity value is higher than the preset humidity threshold, the PLC controller controls the first three-way automatic switching valve to be connected to the first branch pipe to discharge the high-humidity sample gas. The interlocking control between the PLC controller and the second three-way automatic switching valve, the second automatic regulating valve, the first pressure gauge and hygrometer and the first three-way automatic shut-off valve adopts conventional technology well known to those skilled in the art.

[0017] Furthermore, a constant temperature box is provided on the total sample gas distribution pipe between the hygrometer and the first switching valve to keep the temperature of the sample gas constant and avoid errors caused by temperature differences.

[0018] Furthermore, the filter also includes a primary filter, which is arranged at the air inlet of the sample gas distribution pipe.

[0019] Furthermore, the analyzer is provided with a vent pipe, which is connected to the vent port after passing through a vent flow meter and a vent valve in sequence.

[0020] Furthermore, a second manual regulating valve and a second pressure gauge are provided on the sample gas distribution pipe. When the analyzer needs to be calibrated, the analyzer is manually switched to the calibration state, the manual control button is pressed on the touch screen, all the first automatic regulating valves are closed, the sample gas input is stopped, and the standard gas port connected to the first switching valve and the standard gas distribution pipe is opened. The standard gas enters the analyzer and the analyzer enters the calibration mode.

[0021] Beneficial effects of the utility model:

[0022] The utility model provides a pretreatment device for a gas online analyzer, which arranges multiple sample gas distribution pipes in parallel, and the multiple sample gas distribution pipes are respectively connected to different sampling positions. A first automatic regulating valve is arranged on each sample gas distribution pipe, and the first automatic regulating valve receives control from an automatic control module in a PLC controller to perform cyclic opening and cutting actions, thereby switching the multiple sample gases in a cycle, and realizing that one analyzer can sample and measure multiple sample gases at the same time; the first automatic regulating valve can also receive control from a manual control module in the PLC controller, and a certain first automatic cut-off valve can be opened or cut off separately through a touch screen to perform selective sampling, thereby increasing the flexibility of the use of the entire device; the PLC controller The information input end is connected to the analyzer, the PLC controller receives and stores the measurement data sent by the analyzer, the PLC controller sends the measurement data to the DCS controller for display, the DCS controller judges the measurement results and promptly reminds the process personnel to adjust the process; a mist filter and a dehumidifier are set on the total sample gas distribution pipe, the mist filter removes the mist and impurities in the sample gas to protect the analyzer, the dehumidifier dries the sample gas, and the hygrometer monitors the humidity of the sample gas. The PLC controller automatically controls the first three-way automatic switching valve to discharge the high-humidity sample gas; the PLC controller adjusts the opening of the second automatic regulating valve according to the pressure value transmitted by the first pressure gauge to stabilize the pressure of the total sample gas distribution pipe. The utility model provides a gas online analyzer pretreatment device, which realizes multi-point sampling, stabilizes the sample gas pressure, filters the sample gas impurities, and dries the sample gas at the same time, meeting the measurement requirements while ensuring the measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of a gas online analyzer pretreatment device of the utility model Figure 1 .

[0024] Figure 2 A schematic diagram of a gas online analyzer pretreatment device of the utility model Figure 2 .

[0025] Figure 3 Control block diagram for loop sampling of multiple sample gas distribution pipes.

[0026] Reference numerals:

[0027] 1-sample gas distribution pipe, 101-first sample gas distribution main pipe, 102-second sample gas distribution main pipe, 103-total sample gas distribution pipe, 2-standard gas distribution pipe, 3-analyzer, 4-manual stop valve, 5-first automatic regulating valve, 6-sampling pump, 7-pressure reducing valve, 8-water remover, 9-PLC controller, 10-DCS controller, 11-touch screen, 12-connecting valve, 13-total air inlet pipe, 131-first branch pipe, 132-second branch pipe, 14-first three-way automatic cut-off valve Changing valve, 15-exhaust flow meter, 16-exhaust valve, 17-first switching valve, 18-mist filter, 19-first manual regulating valve, 20-first pressure gauge, 21-multi-stage filter, 22-second three-way automatic switching valve, 23-second automatic regulating valve, 24-humidity meter, 25-pressure relief pipe, 26-constant temperature box, 27-primary filter, 28-vent pipe, 29-vent flow meter, 30-vent valve, 31-second manual regulating valve, 32-second pressure gauge. DETAILED DESCRIPTION

[0028] The present invention will be further described below with reference to the accompanying drawings.

[0029] like Figure 1-3 As shown, a gas online analyzer pretreatment device includes a multi-channel sample gas distribution pipe 1 for conveying sample gas and arranged in parallel, and a standard gas distribution pipe 2 for conveying standard gas. The gas outlet ports of the sample gas distribution pipe 1 and the standard gas distribution pipe 2 are both connected to the analyzer 3. The sample gas distribution pipe 1 is provided with a manual stop valve 4 for manually directly controlling the sample gas distribution pipe 1, a first automatic regulating valve 5 for automatically controlling the sample gas distribution pipe 1, a sampling pump 6 for providing power for gas delivery, a pressure reducing valve 7 for adjusting the sample gas pressure, a filter for removing impurities in the sample gas, and a water remover 8 for drying the sample gas. The first automatic regulating valve 5 and the analyzer 3 are both connected to a control unit.

[0030] The control unit has the functions of data storage, execution of logical operations and programming, and is used for data processing and information reception and output to realize central control. The control unit includes a PLC controller 9 and a DCS controller 10. The information output end of the PLC controller 9 is connected to the first automatic regulating valve 5 and the DCS controller 10. The PLC controller 9 is provided with a touch screen 11 for displaying the human-computer interaction interface. The touch screen 11 is provided with a manual control button and an automatic control button. Human-computer interaction is carried out through the manual control button and the automatic control button. A plurality of cut-off buttons and open buttons are provided under the manual control button. A cut-off button and an open button are set as a group. Each group of cut-off buttons and open buttons controls a first automatic regulating valve 5. Multiple groups of cut-off buttons and open buttons are arranged in parallel to realize separate manual control of the first automatic regulating valve 5. A first automatic regulating valve control module is provided in the PLC controller 9. The first automatic regulating valve control module includes a manual control module and an automatic control module. The priority level of the manual control module is higher than that of the automatic control module. When the manual control module is in action, the automatic control module does not act.

[0031] The manual control module includes multiple manual control sub-modules arranged in parallel, and the multiple manual control sub-modules correspond one-to-one to multiple first automatic regulating valves 5 and multiple groups of cut-off buttons and open buttons. Each manual control sub-module includes an opening module for controlling the opening of the first automatic regulating valve 5 and a cut-off module for controlling the cut-off of the first automatic regulating valve 5. The opening module receives the instruction information of the opening button, and the cut-off module receives the instruction information of the cut-off button. Press the manual control button to enter the interface displaying the open button and the cut-off button. Press the open button to input the opening instruction. The opening module receives the opening instruction and sends it to the corresponding first automatic regulating valve 5. The first automatic regulating valve 5 opens and starts sampling. Press the cut-off button of the same group to input the cut-off instruction. The cut-off module receives the cut-off instruction and sends it to the first automatic regulating valve 5 in the open state. The first automatic regulating valve 5 is cut off and sampling stops. In this way, each first automatic regulating valve 5 is manually controlled individually through the touch screen 11.

[0032] The automatic control module includes a plurality of automatic control submodules corresponding to the first automatic regulating valve 5. The automatic control module receives the instruction information of the automatic control button on the touch screen 11. Each automatic control submodule presets the sampling time (for example, 1-10 minutes), the cycle sampling interval (15-60 minutes) and the number of cycle sampling. The cycle sampling interval set by each automatic control submodule is greater than the sum of the sampling times of all automatic control submodules to ensure that only one first automatic regulating valve 5 is in the open state. The first automatic control submodule sends an opening instruction to the first automatic regulating valve 5 corresponding to it. The first automatic The regulating valve 5 receives the instruction, opens the first automatic regulating valve 5 and starts sampling. When the sampling time is reached, the first automatic control submodule sends a cut-off instruction to the first automatic regulating valve 5 corresponding to it and sends information to the second automatic control submodule at the same time. The first automatic regulating valve 5 receives the cut-off instruction, cuts off the first automatic regulating valve 5, and stops sampling. The second automatic control submodule receives the information and determines whether it has reached the next sampling cycle (the second automatic control submodule does not make a judgment when receiving the information for the first time. It compares the time interval between the last sampling time and the time interval between the received information and the preset cyclic sampling interval. The time interval between the last sampling time and the time interval between the received information is the same as the preset cyclic sampling interval). If the time interval is less than the preset cyclic sampling interval, it is determined that the next sampling interval has not arrived. If the time interval between the last sampling time and the received information is not less than the preset cyclic sampling interval, it is determined that the next sampling interval has arrived. If the next sampling interval has arrived, an action is taken. If the next sampling interval has not arrived, an action is taken when it is determined that the time interval between the last sampling time and the received information meets the cyclic sampling interval. The last automatic control submodule sends a cut-off instruction to the first automatic control valve 5 corresponding thereto and sends information to the first automatic control submodule at the same time. When a cyclic sampling interval ends, the first automatic control submodule receives the information and determines whether the next sampling interval has arrived and whether to start the second cyclic sampling. When the cyclic sampling number is met, the automatic control submodule stops sending instructions to the first automatic control valve. Pressing the automatic control button sends an automatic sampling instruction to the automatic control module. The automatic control module receives the instruction and sends it to the first automatic control submodule. The first automatic control submodule receives the instruction and sends it to the first automatic control valve 5 corresponding thereto. The first automatic control valve 5 receives the instruction and opens for sampling. After sampling is completed, information is sent to the second automatic control submodule. Sampling is performed in sequence. The first automatic control valve 5 can be, for example, a solenoid valve.

[0033] The information input end of the PLC controller 9 is connected to the analyzer 3. The PLC controller 9 receives and stores the measurement data sent by the analyzer 3. The PLC controller 9 sends the measurement data to the DCS controller 10 for display. The DCS controller 10 is provided with a judgment unit and an alarm unit. The judgment unit presets an upper limit and a lower limit to determine the measurement result. When the measurement result is lower than the lower limit or higher than the upper limit, the judgment unit sends an instruction to the alarm unit. The alarm unit executes the instruction and issues an alarm, promptly reminding the process personnel to adjust the process. The alarm unit includes, for example, an alarm light and an alarm.

[0034] The sample gas distribution pipe 1 has at least 2 routes, for example, it can be 4-10 routes. The gas inlet port of the sample gas distribution pipe 1 is set at different sampling positions, as long as the detection performance requirements of the gas to be monitored in the equipment or pipeline at the sampling position are the same, for example, the liquid oxygen discharge port in the condenser evaporator of the air cooling device, the purifier inlet, the purifier outlet and the air intake of the air separation device and other locations that need to be sampled have the same detection performance requirements for the gas component indicators to be monitored. Each route of the sample gas distribution pipe 1 is provided with a manual shut-off valve 4 and a first automatic regulating valve 5. A part of the sample gas distribution pipe 1 (for example, the sample gas distribution pipe 1 that needs to be pressurized) The sample gas delivery pipes 1 and the second sample gas delivery pipes 102 are combined into a first sample gas distribution main pipe 101, and the remaining sample gas distribution pipes 1 (for example, the sample gas distribution pipes that need to be decompressed) are combined into a second sample gas distribution main pipe 102. The first sample gas distribution main pipe 101 and the second sample gas distribution main pipe 102 are combined into a total sample gas distribution pipe 103 and then connected to the analyzer 3, or all the sample gas distribution pipes 1 are combined into a total sample gas distribution pipe 103 and then connected to the analyzer 3. A connecting valve 12 is provided at the confluence point of the sample gas distribution pipe 1, the first sample gas distribution main pipe 101 and the second sample gas distribution main pipe 102. The connecting valve 12 can be, for example, a three-way valve to realize the confluence of multiple pipelines.

[0035] like Figure 1 As shown, the sampling pump 6 is arranged on the first sample gas distribution main pipe 101, and the pressure reducing valve 7 is arranged on the second sample gas distribution main pipe 102. The power supply voltage of the sampling pump 6 can be, for example, 220V, the power can be, for example, 0.06KW, and the pressure can be, for example, 250Kpa.

[0036] like Figure 2 As shown, the sampling pump 6, the pressure reducing valve 7 and the water remover 8 are sequentially arranged on the main sample gas distribution pipe 103 along the sample gas conveying direction.

[0037] The total sample gas distribution pipe 103 and the standard gas distribution pipe 2 are combined into a total air intake pipe 13. The total air intake pipe 13 is divided into a first branch pipe 131 and a second branch pipe 132 after passing through a first three-way automatic switching valve 14. The first three-way automatic switching valve 14 is connected to the PLC controller 9. The first branch pipe 131 is connected to the exhaust port after passing through an exhaust flow meter 15 and an exhaust valve 16 in sequence. The second branch pipe 132 is connected to the analyzer 3. A first switching valve 17 is provided at the junction of the total sample gas distribution pipe 103 and the standard gas distribution pipe 2. The switching valve 17 can be, for example, a three-way valve. The first switching valve 17 is used to switch between the sample gas and the standard gas. When the sample gas needs to be measured, the sample gas port connected to the first switching valve 17 and the total sample gas distribution pipe 103 is opened. At this time, the standard gas port connected to the standard gas distribution pipe 2 is closed, and the standard gas cannot enter. When calibrating the analyzer 3, the standard gas port connected to the first switching valve 17 and the standard gas distribution pipe 2 is opened. At this time, the sample gas port is closed, and the sample gas cannot enter, and the analyzer 3 is calibrated. The standard gas can be, for example, nitrogen.

[0038] The filter includes a mist filter 18 arranged on the total sample gas distribution pipe 103. The mist filter 18 is used to remove mist from the sample gas and impurities at the same time to protect the analyzer 3. Preferably, the mist filter 18 is arranged upstream of the water eliminator 8. The upstream is the position where it first contacts the sample gas, that is, the sample gas first passes through the mist filter 18 and then passes through the water eliminator 8. More preferably, the mist filter 18 is arranged between the water eliminator 8 and the pressure reducing valve 7.

[0039] like Figure 1 As shown, a first manual regulating valve 19 for manually adjusting the stable air pressure and a first pressure gauge 20 for displaying the air pressure are provided in sequence along the sample gas delivery direction on the total sample gas distribution pipe 103 between the water eliminator 8 and the first switching valve 17. The first manual regulating valve 19 manually controls the sample gas flow rate and manually adjusts the sample gas pressure according to the pressure value displayed by the first pressure gauge 20.

[0040] like Figure 2As shown, a multi-stage filter 21 for finely removing impurities, a second three-way automatic switching valve 22, a second automatic regulating valve 23, a first pressure gauge 20 and a hygrometer 24 are sequentially provided on the total sample gas distribution pipe 103 between the water remover 8 and the first switching valve 17 along the sample gas delivery direction. The outlet of the second three-way automatic switching valve 22 that is not connected to the total sample gas distribution pipe 103 is connected to a pressure relief pipe 25 to avoid gas accumulation in the multi-stage filter 21. A control valve is provided on the pressure relief pipe 25. The second three-way automatic switching valve 22, the second automatic regulating valve 23, the first pressure gauge 20 and the hygrometer 24 are all connected to the PLC controller 9. The first pressure gauge 20 can be, for example, a remote pressure gauge. The first pressure gauge 20 is used to monitor the air pressure of the total sample gas distribution pipe 103. The PLC controller 9 adjusts the opening of the second automatic regulating valve 23 through the pressure value transmitted by the first pressure gauge 20 to stabilize the pressure of the total sample gas distribution pipe 103; the hygrometer 24 sends the monitored sample gas humidity information to the PLC controller 9. When the humidity value is higher than the preset humidity threshold, the PLC controller 9 controls the first three-way automatic switching valve 14 to connect with the first branch pipe 131 to discharge the high-humidity sample gas. The interlocking control between the PLC controller and the second three-way automatic switching valve 22, the second automatic regulating valve 23, the first pressure gauge 20 and the hygrometer 24 and the first three-way automatic shut-off valve 14 adopts conventional technology well known to those skilled in the art.

[0041] A constant temperature box 26 is provided on the total sample gas distribution pipe 103 between the hygrometer 24 and the first switching valve 17 for maintaining a constant temperature of the sample gas to avoid errors caused by temperature differences.

[0042] like Figure 2 As shown, the filter further includes a primary filter 27, which is disposed at the air inlet of the sample gas distribution pipe.

[0043] The analyzer 3 is provided with a vent pipe 28, which is connected to the vent port after passing through a vent flow meter 29 and a vent valve 30 in sequence.

[0044] A second manual regulating valve 31 and a second pressure gauge 32 are provided on the sample gas distribution pipe 1. When the analyzer 3 needs to be calibrated, the analyzer 3 is manually switched to the calibration state, and the manual control button is pressed on the touch screen 11 to close all the first automatic regulating valves 5, stop the sample gas input, open the standard gas port connected to the first switching valve 17 and the standard gas distribution pipe 2, and the standard gas enters the analyzer 3, and the analyzer 3 enters the calibration mode.

[0045] The pretreatment device of the utility model is applied to multi-point sampling and measurement of various gas analyzers such as oxygen content analyzers, acetylene gas analyzers, nitrogen measurement analyzers, etc.

[0046] The above describes preferred embodiments of the present invention. However, the above description is not intended to be limiting. Those skilled in the art may make numerous changes or modifications to the present invention without departing from the spirit and scope of the present invention. Such changes or modifications are intended to fall within the scope of the appended claims.

Claims

1. A gas online analyzer pretreatment device, characterized in that: The invention comprises a multi-channel sample gas distribution pipe (1) for conveying sample gas and arranged in parallel, and a standard gas distribution pipe (2) for conveying standard gas. The gas outlet ports of the sample gas distribution pipe (1) and the standard gas distribution pipe (2) are both connected to an analyzer (3). The sample gas distribution pipe (1) is provided with a manual stop valve (4) for manually and directly controlling the sample gas distribution pipe (1), a first automatic regulating valve (5) for automatically controlling the sample gas distribution pipe (1), a sampling pump (6) for providing power for gas delivery, a pressure reducing valve (7) for regulating the sample gas pressure, a filter for removing sample gas impurities, and a dehumidifier (8) for drying the sample gas. The first automatic regulating valve (5) and the analyzer (3) are both connected to a control unit.

2. The gas online analyzer pretreatment device according to claim 1, characterized in that: The control unit includes a PLC controller (9) and a DCS controller (10). The information output end of the PLC controller (9) is connected to the first automatic regulating valve (5) and the DCS controller (10). The PLC controller (9) is provided with a touch screen (11). The touch screen (11) is provided with a manual control button and an automatic control button. The manual control button is provided with a plurality of cut-off buttons and open buttons. A cut-off button and an open button are set as a group. Each group of cut-off buttons and open buttons controls a corresponding first automatic regulating valve (5). The plurality of cut-off buttons and open buttons are arranged in parallel. The PLC controller (9) is provided with a first automatic regulating valve control module. The first automatic regulating valve control module includes a manual control module and an automatic control module. The manual control module comprises a plurality of manual control submodules arranged in parallel, the plurality of manual control submodules corresponding one-to-one to the plurality of first automatic regulating valves (5) and the plurality of groups of cut-off buttons and opening buttons, each manual control submodule comprising an opening module for controlling the opening of the first automatic regulating valve (5) and a cut-off module for controlling the opening of the first automatic regulating valve (5), the opening module receiving instruction information from the opening button, and the cut-off module receiving instruction information from the cut-off button, the automatic control module comprising a plurality of automatic control submodules corresponding one-to-one to the first automatic regulating valves (5), the automatic control module receiving instruction information from the automatic control buttons on the touch screen (11), and each automatic control submodule presetting a sampling time, a cyclic sampling interval period, and a cyclic sampling number of times.

3. The gas online analyzer pretreatment device according to claim 1 or 2, characterized in that: The sample gas distribution pipe (1) is at least two-way, and the gas inlet port of the sample gas distribution pipe (1) is set at different sampling positions. A manual stop valve (4) and a first automatic regulating valve (5) are provided on each of the sample gas distribution pipes (1). A part of the sample gas distribution pipes (1) are merged into a first sample gas distribution main pipe (101), and the rest of the sample gas distribution pipes (1) are merged into a second sample gas distribution main pipe (102). The first sample gas distribution main pipe (101) and the second sample gas distribution main pipe (102) are merged into a total sample gas distribution pipe (103) and then connected to the analyzer (3), or all the sample gas distribution pipes (1) are merged into the total sample gas distribution pipe (103) and then connected to the analyzer (3). A connecting valve (12) is provided at the merging point of the sample gas distribution pipe (1), the first sample gas distribution main pipe (101) and the second sample gas distribution main pipe (102).

4. The gas online analyzer pretreatment device according to claim 3, characterized in that: The sampling pump (6) is arranged on the first sample gas distribution main pipe (101), and the pressure reducing valve (7) is arranged on the second sample gas distribution main pipe (102).

5. The gas online analyzer pretreatment device according to claim 3, characterized in that: The sampling pump (6), the pressure reducing valve (7) and the water remover (8) are sequentially arranged on the main sample gas distribution pipe (103) along the sample gas conveying direction.

6. The gas online analyzer pretreatment device according to claim 3, characterized in that: The total sample gas distribution pipe (103) and the standard gas distribution pipe (2) merge into a total air intake pipe (13). The total air intake pipe (13) is divided into a first branch pipe (131) and a second branch pipe (132) after passing through a first three-way automatic switching valve (14). The first three-way automatic switching valve (14) is connected to a PLC controller (9). The first branch pipe (131) is connected to an exhaust port after passing through an exhaust flow meter (15) and an exhaust valve (16) in sequence. The second branch pipe (132) is connected to an analyzer (3). A first switching valve (17) is provided at the junction of the total sample gas distribution pipe (103) and the standard gas distribution pipe (2).

7. The gas online analyzer pretreatment device according to claim 1 or 6, characterized in that: The filter comprises a mist filter (18) arranged on the total sample gas distribution pipe (103).

8. The gas online analyzer pretreatment device according to claim 6, characterized in that: A first manual regulating valve (19) for manually regulating and stabilizing air pressure and a first pressure gauge (20) for displaying air pressure are sequentially provided on the total sample gas distribution pipe (103) between the dehydrator (8) and the first switching valve (17) along the sample gas delivery direction.

9. The gas online analyzer pretreatment device according to claim 6, characterized in that: A multi-stage filter (21) for finely removing impurities, a second three-way automatic switching valve (22), a second automatic regulating valve (23), a first pressure gauge (20) and a hygrometer (24) are sequentially provided on the total sample gas distribution pipe (103) between the dehydrator (8) and the first switching valve (17) along the sample gas delivery direction. The second three-way automatic switching valve (22), the second automatic regulating valve (23), the first pressure gauge (20) and the hygrometer (24) are all connected to the PLC controller (9).

10. The gas online analyzer pretreatment device according to claim 2, characterized in that: The information input end of the PLC controller (9) is connected to the analyzer (3), the PLC controller (9) receives and stores the measurement data sent by the analyzer (3), and the PLC controller (9) sends the measurement data to the DCS controller (10) for display. The DCS controller (10) is provided with a judgment unit and an alarm unit.

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