A composite multi-path multi-cut full-automatic ultra-low temperature cold trap water removal system

Abstract

The application discloses a kind of composite multi-path multi-cut full-automatic ultra-low temperature cold trap water removal system, including standard gas and quality control gas input unit, multi-point sampling unit, first-stage gas delivery unit, second-stage gas delivery unit, double-temperature-zone refrigeration / heating unit, main control unit;Multi-point sampling unit, first-stage gas delivery unit, double-temperature-zone refrigeration / heating unit in first-stage temperature zone, second-stage gas delivery unit, double-temperature-zone refrigeration / heating unit in second-stage temperature zone are sequentially communicated, the application is applicable to cold trap technical field, system integration degree is high, without additional additional components or equipment such as rotary valve can complete the gas source switching of different purposes, simultaneously using two-stage gas delivery design, ensure that the function of each unit is independent and the flow rate of each gas channel reaches the set target, and using double-temperature-zone design, reduce the switching frequency between cold trap module, prolong the service life of equipment, under the premise of guaranteeing that target gas composition is not disturbed, maximum efficiency removes water vapor contained in the gas to be measured.

Description

Technical Field

[0001] This invention belongs to the field of cold trap technology, specifically a composite multi-channel multi-switching fully automatic ultra-low temperature cold trap water removal system. Background Technology

[0002] Typically, high-precision greenhouse gas monitoring equipment is used to continuously extract atmospheric data for online measurement of target gases. However, varying levels of water vapor content in the atmosphere significantly affect the accuracy and precision of these measurements. For current high-precision greenhouse gas analyzers based on spectral technology, the World Meteorological Organization (WMO) explicitly requires that the water vapor content in the target gas be below 500 ppm. Therefore, specialized equipment is needed to perform high-level drying of the gas to be measured to obtain a water vapor content below 500 ppm or even lower.

[0003] For atmospheric dehydration, cryogenic cold traps are currently the most widely used dehydration devices. Most cryogenic cold trap devices on the market employ semiconductor or compressor refrigeration, with two cold traps alternating for dehydration and de-icing. However, these methods generally suffer from low refrigeration efficiency, frequent switching between cold traps, lack of sample pretreatment before switching, excessively long time required to reduce water vapor levels below 500 ppm after switching, inability of standard gas to pass through the cold trap, high standard gas consumption with excessively long stabilization periods, and pressure changes caused by cold trap switching affecting measurement results. These issues severely impact the measurement of high-precision greenhouse gases. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a composite multi-channel multi-switching fully automatic ultra-low temperature cold trap dewatering system.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A composite multi-channel multi-switching fully automatic ultra-low temperature cold trap dehydration system includes a standard gas and quality control gas input unit, a multi-point sampling unit, a primary gas supply unit, a secondary gas supply unit, and a dual-temperature zone refrigeration / heating unit;

[0007] The multi-point sampling unit, the primary air supply unit, the primary temperature zone of the dual-temperature zone cooling / heating unit, the secondary air supply unit, and the secondary temperature zone of the dual-temperature zone cooling / heating unit are connected in sequence.

[0008] Preferably, the standard gas and quality control gas input unit is located on the upper right side of the rear panel of the chassis, including nine standard gas inlets, a standard gas valve group with nine solenoid valves, and the confluence output end is connected to the gas pump of the secondary gas delivery unit in parallel through two-position three-way solenoid valves.

[0009] Preferably, the multi-point sampling unit is located on the upper left side of the rear panel of the chassis, and includes eight sample gas inlets at different heights, eight sampling tubes, a sample gas valve group with eight solenoid valves, and an air pump. A water vapor separation device for the multi-point sampling unit is provided after the air pump for drawing air from different heights to the front end of the primary air delivery unit.

[0010] Preferably, the primary air supply unit includes two miniature air supply pumps, the front end of which is connected to the air outlet of the water-air separation device of the multi-point sampling unit, and the rear end of which is connected to a primary water removal coil placed in the primary temperature zone. A water-air separator is provided at the rear end of the primary water removal coil.

[0011] Preferably, the secondary air supply unit includes two miniature air supply pumps and two floats or mass flow meters. Its front end is connected to the air outlet of the water-air separator of the two primary water removal units through a two-position three-way solenoid valve, and its rear end is connected to a float or mass flow meter. Then, it is connected to the output of the standard gas and quality control gas units through a two-position three-way solenoid valve for supplying gas to the cold trap.

[0012] Preferably, the dual-temperature zone refrigeration / heating unit includes two functionally independent cold trap modules A and B, each including a refrigeration compressor, two heating units, and two cold trap units. Each cold trap unit includes three cold trap tubes, and each cold trap tube is provided with a two-position three-way solenoid valve or two two-position two-way solenoid valves at its upper and lower ends for controlling the flow direction of gas and / or liquid.

[0013] Preferably, it also includes a flow control and pressure balancing unit, which is connected to the secondary temperature zone in the dual-temperature zone cooling / heating unit. It adopts a structure with the mass flow meter in front and the pressure balancing buffer overflow behind, and is finally connected to the analyzer.

[0014] Preferably, it also includes a chassis, the back panel of which is provided with a sample gas inlet, an outlet, a standard gas inlet, a communication interface, a de-icing purge port, and a power interface. The sample gas inlet is connected to the multi-point sampling unit and to the internal manifold of the chassis. The flow control and pressure balancing unit is connected to the analyzer through the outlet, and the communication interface is connected to the external control system.

[0015] Preferably, the main control unit includes a main control computer, two 32-bit relays, etc., and mainly performs functions such as gas path switching, refrigeration control, heating control, protection control, and communication with other analyzers.

[0016] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0017] In this invention, the system has a high degree of integration, and can complete the switching of gas sources for different purposes without the need for additional components or equipment such as rotary valves. At the same time, it adopts a two-stage gas delivery design to ensure that the function of each unit is independent and the flow rate of each gas channel reaches the set target. Furthermore, it adopts a dual-temperature zone design to reduce the switching frequency between cold trap modules and extend the service life of the equipment. Under the premise of ensuring that the target gas composition is not disturbed, it removes water vapor contained in the gas to be tested with maximum efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the gas path of the present invention;

[0019] Figure 2 This is a schematic diagram of the chassis back panel structure of the present invention;

[0020] Figure 3 This is an internal top view of the present invention;

[0021] Figure 4 This is an internal side view A of the present invention;

[0022] Figure 5 This is an internal side view B of the present invention.

[0023] Reference numerals in the attached diagram: 1. Primary dewatering coil; 2. Purge pump; 3. Sample gas valve assembly; 4. Float or mass flow meter; 5. Standard gas valve assembly; 6. Inlet pump; 7. Heating module; 8. Multi-point sampling unit water vapor separation device; 9. Buffer bottle; 10. Compressor; 11. Control board; 12. Cold trap tube; 13. Compressor controller; 14. Sample gas inlet; 15. Outlet; 16. Standard gas inlet; 17. Communication interface; 18. De-icing purge port; 19. Power interface. Detailed Implementation

[0024] The following is in conjunction with the appendix Figures 1-5 This further illustrates the specific implementation of the composite multi-channel multi-switching fully automatic ultra-low temperature cold trap dewatering system of the present invention. The composite multi-channel multi-switching fully automatic ultra-low temperature cold trap dewatering system of the present invention is not limited to the description of the following embodiments.

[0025] Example:

[0026] This embodiment provides a specific implementation method for a composite multi-channel multi-cut fully automatic ultra-low temperature cold trap dehydration system, such as... Figure 1 As shown, it includes a standard gas and quality control gas input unit, a multi-point sampling unit, a primary gas delivery unit, a secondary gas delivery unit, and a dual-temperature zone cooling / heating unit;

[0027] The multi-point sampling unit, the primary air supply unit, the primary temperature zone of the dual-temperature zone cooling / heating unit, the secondary air supply unit, and the secondary temperature zone of the dual-temperature zone cooling / heating unit are connected in sequence.

[0028] Furthermore, the system includes a two-stage air supply unit and a two-stage water removal unit, having at least two primary air supply pumps and at least two primary water removal units. Each primary water removal unit includes at least one water-air separator at its end. It also has at least two secondary air supply pumps and at least two secondary water removal units, wherein the front end of the secondary air supply pumps is connected to the air outlet of the water-air separator of the primary water removal unit.

[0029] Furthermore, the two temperature zones are used for primary low-temperature dewatering (0-2℃) and secondary ultra-low-temperature dewatering (down to -78℃), respectively.

[0030] Furthermore, the system includes at least two sets of compressors 10, controlled by a compressor controller 13. Each compressor 10 provides cooling capacity to a secondary refrigeration module containing two sets of cold trap units and to a primary refrigeration module. Each of the two sets of cold trap units contains at least one cold trap tube 12.

[0031] Furthermore, the cold trap tube 12 adopts a spiral upper and lower structure, with the compressor refrigeration coils wrapped around it and the cold trap tube installed vertically; the upper end of the metal tube outlet is equipped with a ventilation isolation pad to prevent frost and snow from being blown out with the airflow.

[0032] Furthermore, each cold trap unit comprises cold trap tubes 12 integrated into a single manifold, wherein the bottom air inlet manifold includes at least two independent air supply channels and one drain / backflush channel. The upper air outlet includes at least one independent air outlet channel and one vent / backflush channel. The air outlets of at least two cold trap units are connected in series and lead to the analysis direction.

[0033] Furthermore, the system includes a control board 11, which includes sample pretreatment control logic. Specifically, before the end of the set working time of one cold trap tube 12 in a certain group of cold traps (e.g., A1), the control point of one cold trap tube 12 in the secondary group of cold traps (e.g., A2) starts according to the set time and begins to purge and prepare the gas to be tested and discharge the gas. The current cold trap tube 12 (A1) stops working, and the secondary cold trap tube 12 (A2) simultaneously incorporates the gas to be tested into the measurement gas path.

[0034] Furthermore, the main control unit includes a main control computer, two 32-bit relays, etc., and mainly performs functions such as gas path switching, refrigeration control, heating control, protection control, and communication with other analyzers.

[0035] By adopting the above technical solution:

[0036] Through the intake pump 6, the multi-point sampling unit draws sample gas from different heights to the front end of the primary gas delivery unit. The primary gas delivery unit then draws the sample gas to the primary temperature zone of the dual-temperature cooling / heating unit for primary water removal. After primary water removal, the sample gas is drawn by the secondary active gas delivery unit to the secondary temperature zone of the dual-temperature cooling / heating unit for secondary water removal. After secondary water removal, the sample gas leaves the dual-temperature cooling / heating unit and is sent to the flow control and pressure balancing unit, and finally reaches the outlet 15 on the back panel of the cold trap.

[0037] In one possible implementation, such as Figure 2 As shown, it also includes a chassis. The back panel of the chassis is provided with a sample gas inlet 14, an outlet 15, a standard gas inlet 16, a communication interface 17, a de-icing purge port 18, and a power interface 19. The sample gas inlet 14 is connected to the multi-point sampling unit and to the internal manifold of the chassis. The flow control and pressure balancing unit is connected to the analyzer through the outlet 15, and the communication interface 17 is connected to the external control system.

[0038] Furthermore, the side and back panels of the chassis are equipped with air ducts; the chassis air duct design includes ventilation for system components, cooling system, and heating system. The side panels of the chassis use louvered air inlets, and the back panel uses circular air outlets, both equipped with fans. During operation, outside air is drawn in through the air inlets, and internal heat is blown out through the air outlets by the fans, thus achieving ventilation for system components and various systems, keeping the temperature inside the chassis consistent with the outside temperature, and extending the equipment's lifespan.

[0039] In one possible implementation, the standard gas and quality control gas input unit is located on the upper right side of the rear panel of the chassis, including nine standard gas inlets (including four standard gas inlets, two long-term and short-term target gas inlets, and three inspection gas inlets), a standard gas valve group 5 with nine solenoid valves, and the confluence output end is connected to the gas pump of the secondary gas delivery unit in parallel through two-position three-way solenoid valves.

[0040] In one possible implementation, such as Figures 2-3 As shown, the multi-point sampling unit is located on the upper left side of the rear panel of the chassis. It includes eight sample gas inlets at different heights, eight sampling tubes, a sample gas valve group 3 with eight solenoid valves, and an air pump 6 (flow rate > 11L / min). A water vapor separation device 8 for the multi-point sampling unit is located after the air pump 6, which is used to draw air from different heights to the front end of the primary air delivery unit.

[0041] In one possible implementation, such as Figure 3As shown, the primary air supply unit includes two miniature air supply pumps (with flow rates generally > 2 L / min) with the same flow rate. The front end of the pump is connected to the air outlet of the water-air separation device 8 of the multi-point sampling unit, and the rear end of the pump is connected to a primary water removal coil 1 placed in the primary temperature zone. A water-air separator is provided at the rear end of the primary water removal coil 1.

[0042] In one possible implementation, such as Figure 3 As shown, the secondary gas delivery unit includes two miniature gas delivery pumps (with a flow rate generally not less than 1 L / min) and two floats or mass flow meters 4. The front ends of the two miniature gas delivery pumps are respectively connected to the gas outlets of the two sets of water-gas separators of the primary water removal unit through a two-position three-way solenoid valve. The rear end of each miniature gas delivery pump is connected to a float or mass flow meter 4. Both flow meters can adjust the flow rates of the two sets of gases entering the cold trap to be the same, and can adjust the flow rate to meet the flow requirements of different analyzers. The total flow rate when the two flow meters are working simultaneously must exceed twice the flow rate of a single primary gas delivery pump. The rear end of the flow meters is connected to the output end of the standard gas and quality control gas units through a two-position three-way solenoid valve to supply gas to the cold trap.

[0043] In one possible implementation, such as Figures 3-5 As shown, the dual-temperature zone refrigeration / heating unit includes two functionally independent cold trap modules A and B, each including a refrigeration compressor, two heating units, and two cold trap units. Each cold trap unit includes three cold trap tubes 12, distinguished by odd-numbered cold trap tubes A1 / A3 / A5 and even-numbered cold trap tubes A2 / A4 / A6. Each cold trap tube 12 is equipped with a two-position three-way solenoid valve or two two-position two-way solenoid valves at its upper and lower ends to control the flow direction of gas and / or liquid.

[0044] It should be noted that the bottom of the odd-numbered cold trap tubes A1 / A3 / A5 are connected to the output of one of the secondary air supply units via a manifold, and are connected in parallel with another set of odd-numbered cold trap tubes B1 / B3 / B5 units via one two-position three-way solenoid valve or two two-position two-way solenoid valves; the connection method for even-numbered cold trap tubes A2 / A4 / A6 is similar to that of B2 / B4 / B6. The backflush / drainage air passage at the bottom of each cold trap module is a common air passage, with a two-position two-way solenoid valve control switch at the end. The upper measuring air outlet and exhaust / backflush port of each cold trap module are converged through a manifold. All measuring air outlets of modules A and B are connected in series, and then connected to the flow control and pressure balancing unit; the exhaust / backflush port is connected to a vent solenoid valve via a three-way valve, and is connected to the backflush air pump via a two-position three-way solenoid valve.

[0045] It should be noted that each cold trap unit contains one heating module 7, and the two modules A and B contain a total of four heating modules 7, which provide a heat source for heating and de-icing the cold trap. During the heating and de-icing stage, the heating modules 7 raise the temperature to above 0°C before activating the purge pump 2 to prevent the purge gas from condensing after entering the cold trap in the low-temperature environment, which would affect the purging effect.

[0046] It should be noted that each cold trap contains a low-temperature zone (0-2℃) at the top for primary water removal and an ultra-low-temperature zone (down to -78℃) at the bottom for secondary water removal.

[0047] In one possible implementation, such as Figures 3-5 As shown, it also includes a flow control and pressure balancing unit, which is connected to the secondary temperature zone in the dual-temperature zone cooling / heating unit. It adopts a structure with the mass flow meter in front and the pressure balancing buffer overflow behind, and is finally connected to the analyzer.

[0048] Based on the above scheme, further, such as Figures 3-5 As shown, the flow control and pressure balancing unit includes a flow-adjustable mass flow controller and a buffer bottle 9 with an overflow port. The mass flow meter is connected to the AB trap outlet, and then connected to the buffer bottle 9 and the analyzer inlet.

[0049] Based on the above scheme, further, such as Figure 3 As shown, the main control unit includes a main control computer, two 32-bit relays, etc., and mainly performs functions such as gas path switching, refrigeration control, heating control, protection control, and communication with other analyzers.

[0050] The present invention has the following advantages:

[0051] High degree of integration: The device includes 9 standard gas / quality control gas units and 8 sample gas units, and can switch gas sources for different purposes without the need for additional components or equipment such as rotary valves.

[0052] Two-stage gas delivery design: The device includes two primary gas delivery units and two secondary gas delivery units, ensuring that each unit functions independently and that the flow rate of each gas channel reaches the set target.

[0053] Dual-temperature zone design: The device includes two temperature zones. The first-level temperature zone has a temperature as low as 0 ~ 2℃, which is used to remove most of the water vapor in the target gas, improve the water removal efficiency of the second-level cold trap tube, reduce the switching frequency between cold trap modules, and extend the service life of the equipment. The second-level temperature zone has a temperature as low as -78℃, which removes water vapor in the gas to be tested with maximum efficiency while ensuring that the composition of the target gas is not disturbed (such as the target gas is not captured by the low temperature).

[0054] Seamless gas path switching: Two cold trap units (odd-numbered and even-numbered) within the same cold trap module are functionally identical and independent, with their cold trap tubes switching alternately. Before switching to the next channel, the gas path logic is controlled to flush the pipeline of the next channel with a homogeneous gas, ensuring that the analyte gas in that channel has the same substance content (except for water vapor content) as the gas in the previous channel. After sufficient pre-cooling in the rotation sequence, the AB cold trap modules switch between the A6-B1 and B6-A1 cold trap tubes to complete the functional alternation of the two modules. Simultaneously, the pressure balancing unit eliminates pressure fluctuations caused by solenoid valve switching that are transmitted to the analyzer. Through sample pretreatment and pressure balancing of the next channel, seamless gas path switching is achieved, eliminating invalid data introduced by gas path switching.

[0055] Test gas and standard / control gas subcooling trap: The internal volume of the cold trap tube is as small as 60ml, which allows for the fastest flushing of the pipeline and the fastest turnover rate. This means minimal consumption of standard and control gas. At the same time, all gases pass through the cold trap, which keeps the gas temperature and moisture content at the outlet similar, improving the accuracy of gas measurement.

[0056] The cold trap has a scientifically designed air inlet and outlet direction: This design uses a bottom air inlet and top air outlet to remove water and obtain dry air; ice is melted and water is drained through top backflushing and bottom drainage.

[0057] It adopts single-compressor cascade refrigeration technology: a single compressor achieves ultra-low temperature refrigeration, and dual compressors achieve module alternation.

[0058] In summary, the present invention has the following advantages:

[0059] 1. High degree of integration: The device includes nine standard gas / quality control gas units and eight sample gas units, which can complete the switching of gas sources for different purposes without the need for additional components or equipment such as rotary valves.

[0060] 2. Two-stage gas delivery design: The device includes two primary gas delivery units and two secondary gas delivery units, ensuring that the function of each unit is independent and that the flow rate of each gas channel reaches the set target.

[0061] 3. Dual-temperature zone design: The device includes two temperature zones. The first-level temperature zone has a temperature as low as 0 ~ 2℃, which is used to remove most of the water vapor in the target gas, extend the water removal time of the second-level cold trap tube, reduce the switching frequency between cold trap modules, and extend the service life of the equipment. The second-level temperature zone has a temperature as low as -78℃, which removes water vapor in the gas to be tested with maximum efficiency while ensuring that the composition of the target gas is not disturbed (such as the target gas is not captured by the low temperature).

[0062] 4. Seamless Gas Path Switching: Two cold trap units (odd-numbered and even-numbered) within the same cold trap module are functionally identical and independent, with their cold trap tubes switching alternately. Before switching to the next channel, the gas path logic is controlled to flush the next channel's tubing with a homogeneous gas, ensuring the analyte gas in that channel has the same content (except for water vapor) as the gas in the previous channel. After sufficient pre-cooling in the rotation sequence, the A6-B1 and B6-A1 cold trap modules switch to complete the functional transition between the two modules. Simultaneously, a pressure balancing unit eliminates pressure fluctuations caused by solenoid valve switching that are transmitted to the analyzer. Seamless gas path switching is achieved through sample pretreatment and pressure balancing in the next channel, eliminating invalid data introduced by gas path switching.

[0063] 5. Test gas and standard / control gas subcooling trap: The internal volume of the cold trap tube is as small as 60ml, which can flush the pipeline the fastest and obtain the fastest turnover rate. This means minimal consumption of standard and control gas. At the same time, all gases pass through the cold trap, which will keep the gas temperature and moisture content at the outlet similar, improving the accuracy of gas measurement.

[0064] 6. Scientific air inlet and outlet direction of the cold trap: This design adopts the bottom air inlet and top air outlet method to remove water and obtain dry air; ice is melted and drained by top backflushing and bottom drainage.

[0065] 7. Adopting single-compressor cascade refrigeration technology: a single compressor achieves ultra-low temperature refrigeration, and dual compressors achieve module alternation.

[0066] Working principle: such as Figures 1-5 As shown, the above-mentioned composite multi-channel multi-slice fully automatic ultra-low temperature cold trap dehydration device is used for sample gas pretreatment and dehydration, including the following steps:

[0067] 1) System Startup: Upon initial startup, the software determines the cold trap status at the time of the last system shutdown. If cold trap A has been purged or the dewatering time of channel A1 is less than the set time when the system was shut down, cold trap A directly enters the cooling stage upon system startup. After the set cooling time is reached, channel A1 begins dewatering. If the dewatering time of channel A1 is greater than the set time when the system was shut down, cold trap A is first heated and purged after system startup. Cooling begins after the purging of cold trap A is completed. After the set cooling time is reached, channel A1 begins dewatering.

[0068] 2) Sample Gas Preparation and Ice-melting Purging: After reaching the set cooling temperature, cold trap A is in a low-temperature environment. The control system issues a command, and the primary gas delivery unit draws ambient air through the primary dehydration system before entering the A1 cold trap tube. The sample gas, after being dehydrated by the cold trap, passes through the pressure balancing system (buffer bottle) and finally enters the analyzer for measurement. While dehydration begins in channel A1, cold trap B begins heating and purging. After cold trap tube A1 has been running for a period of time, before A1 stops measuring, the control system issues a command, and pump P4 starts. By controlling solenoid valves 4 and 10, the sample gas enters the A2 cold trap tube in advance for pretreatment. When A1 stops measuring, solenoid valve 10 actuates, and the sample gas from the A2 cold trap tube enters the analyzer for measurement. This cycle continues until all six channels of the A group of cold traps have completed operation, then switching to the B group of cold traps. When the B group of cold traps starts running, the heating system of the A group of cold traps begins to work, and the temperature of the A group of cold traps gradually rises. The solid ice in the cold trap tube melts into liquid water, which flows out of the system by controlling solenoid valve 13. When the temperature in the cold trap of group A rises to 0℃, pump P6 is turned on, and reverse purging is initiated by controlling solenoid valve No. 30 to purge the cold trap of group A.

[0069] 3) Analyzer calibration: The calibration time and interval of the standard gas can be set in the system and controlled by the control module. When the set standard gas inlet time is reached, the control module issues a command, and solenoid valves 25 or 26 are activated, closing the sample gas channel and opening the standard gas channel.

[0070] By adopting the above technical solution:

[0071] This system can pre-treat sample gas and standard gas. Through a two-stage dehydration design, the first stage uses cryogenic dehydration at temperatures as low as 0-2℃, while the second stage uses ultra-low temperature dehydration at temperatures as low as -78℃, solving the problem of ice blockage caused by long single-channel cold trap operation. Before the previous cold trap channel finishes dehydration, the next cold trap channel enters the pre-preparation state in advance, ensuring seamless gas path switching and eliminating invalid data introduced during cold trap channel switching. The single-channel cold trap operation time can be adjusted according to the ambient atmospheric humidity, and the sample pre-preparation time can be adjusted according to the distance between the sampling port and the cold trap sample gas inlet, maximizing the single-channel cold trap operation time while ensuring effective dehydration. The dehydration time of the channels is reduced, decreasing the cold trap switching frequency; the use of compressor refrigeration solves the problems of poor refrigeration effect and the need for regular maintenance; the use of single-compressor cascade refrigeration and dual-compressor duplex alternating mode extends the equipment's service life; a buffer device is installed inside the cold trap to solve the pressure and flow fluctuations that may occur during cold trap switching, avoiding the impact of pressure and flow fluctuations on the analyzer's high-precision measurement of sample gas; a total of 8 sample gas channels, 4 standard gas channels, 2 target gas channels (1 long-term target gas channel and 1 short-term target gas channel), and 3 inspection standard gas channels are designed to meet different application conditions.

[0072] It is worth noting that this system is compatible with various brands of analyzers, integrating technology and functionality.

[0073] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A composite multi-channel multi-switching fully automatic ultra-low temperature cold trap dehydration system, characterized in that: It includes a standard gas and quality control gas input unit, a multi-point sampling unit, a primary gas delivery unit, a secondary gas delivery unit, a dual-temperature zone cooling / heating unit, and a main control unit; The multi-point sampling unit, the primary air supply unit, the primary temperature zone of the dual-temperature zone cooling / heating unit, the secondary air supply unit, and the secondary temperature zone of the dual-temperature zone cooling / heating unit are connected in sequence; The primary air supply unit includes two micro air supply pumps with the same flow rate. The front end of the pump is connected to the air outlet of the water-air separation device (8) of the multi-point sampling unit, and the rear end of the pump is connected to a primary water removal coil (1) placed in the primary temperature zone. A water-air separator is provided at the rear end of the primary water removal coil (1). The secondary air supply unit includes two miniature air supply pumps and two floats or mass flow meters (4). The front end of each miniature air supply pump is connected to the outlet of the water-air separator of the two primary water removal units through a two-position three-way solenoid valve, and the rear end is connected to the float or mass flow meter (4). The rear end of the flow meter is connected to the output of the standard gas and quality control gas units through a two-position three-way solenoid valve for supplying gas to the cold trap. The dual-temperature zone refrigeration / heating unit includes two sets of functionally independent cold trap modules A and B, each including a refrigeration compressor (10), two sets of heating units, and two cold trap units. Each cold trap unit includes three cold trap tubes (12). Each cold trap tube (12) is equipped with a two-position three-way solenoid valve or two two-position two-way solenoid valves at its upper and lower openings to control the flow direction of gas and / or liquid.

2. The composite multi-channel multi-switching fully automatic ultra-low temperature cold trap dehydration system as described in claim 1, characterized in that: The standard gas and quality control gas input unit is located on the upper right side of the rear panel of the chassis, including nine standard gas inlets (16) and a standard gas valve group (5) with nine solenoid valves. The confluence output end is connected to the gas pump of the secondary gas delivery unit in parallel through two-position three-way solenoid valves.

3. The composite multi-channel multi-switching fully automatic ultra-low temperature cold trap dehydration system as described in claim 1, characterized in that: The multi-point sampling unit is located on the upper left side of the rear panel of the chassis. It includes eight sample gas inlets (14) at different heights, eight sampling tubes, a sample gas valve group (3) with eight solenoid valves, and an air pump (6). A multi-point sampling unit water vapor separation device (8) is provided after the air pump (6) to draw air from different heights to the front end of the primary air delivery unit.

4. The composite multi-channel multi-switching fully automatic ultra-low temperature cold trap dewatering system as described in claim 1, characterized in that: It also includes a flow control and pressure balancing unit, which is connected to the secondary temperature zone in the dual-temperature zone cooling / heating unit. It adopts a structure with the mass flow meter in front and the pressure balancing buffer overflow behind, and is finally connected to the analyzer.

5. The composite multi-channel multi-switching fully automatic ultra-low temperature cold trap dewatering system as described in claim 1, characterized in that: It also includes a chassis, the back panel of which is provided with a sample gas inlet (14), an outlet (15), a standard gas inlet (16), a communication interface (17), a de-icing purge port (18), and a power interface (19). The sample gas inlet (14) is connected to the multi-point sampling unit and to the internal busbar of the chassis. The flow control and pressure balancing unit is connected to the analyzer through the outlet (15), and the communication interface (17) is connected to the external control system.

6. The composite multi-channel multi-switching fully automatic ultra-low temperature cold trap dehydration system as described in claim 1, characterized in that: The main control unit includes a main control computer and two 32-bit relays, and is mainly responsible for gas path switching, refrigeration control, heating control, protection control, and communication with other analyzers.

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