CN-117443146-B - Combined type multichannel multi-cutting full-automatic ultralow temperature cold trap water removal system

Abstract

The invention discloses a combined type multipath multi-cutting full-automatic ultralow temperature cold trap water removal system, which comprises a standard gas and quality control gas input unit, a multipoint sampling unit, a primary gas supply unit, a secondary gas supply unit, a double-temperature-zone refrigerating/heating unit and a main control unit; the multi-point sampling unit, the primary air supply unit, the primary temperature area in the double-temperature area refrigerating/heating unit, the secondary air supply unit and the secondary temperature area in the double-temperature area refrigerating/heating unit are sequentially communicated, the multi-point sampling unit is suitable for the technical field of cold traps, the system integration degree is high, air source switching of different purposes can be completed without additional components or equipment such as a rotary valve, the function independence of each unit is ensured, the flow speed of each air channel reaches a set target by adopting a two-stage air supply design, the switching frequency among cold trap modules is reduced by adopting a double-temperature area design, the service life of equipment is prolonged, and the water vapor contained in air to be tested is removed at maximum efficiency on the premise that the components of target air are not interfered.

Inventors

• ZHANG GUANGHUI

Assignees

• 北京普瑞亿科科技有限公司

Dates

Publication Date

20260512

Application Date

20231102

Claims (6)

1. 1. The composite multipath multi-cutting full-automatic ultralow temperature cold trap water removal system is characterized by comprising a standard gas and quality control gas input unit, a multipoint sampling unit, a primary gas supply unit, a secondary gas supply unit, a double-temperature-zone refrigerating/heating unit and a main control unit; the multi-point sampling unit, the primary air supply unit, the primary temperature area in the double-temperature-area refrigerating/heating unit, the secondary air supply unit and the secondary temperature area in the double-temperature-area refrigerating/heating unit are sequentially communicated; the primary air supply unit comprises two miniature air supply pumps with the same flow rate, the front end of the miniature air supply pumps is connected to the air outlet end of the water-air separation device (8) of the multipoint sampling unit, the rear end of the miniature air supply pumps is connected with a primary water removal coil (1) arranged in a primary temperature zone, and the rear end of the primary water removal coil (1) is provided with a water-air separator; The secondary air supply unit comprises two miniature air supply pumps and two floats or mass flow meters (4), wherein the front ends of the miniature air supply pumps are respectively connected with the air outlet ends of the water-gas separators of the two groups of primary water removal units through two-position three-way electromagnetic valves, the rear ends of the miniature air supply pumps are respectively connected with the floats or mass flow meters (4), and the rear ends of the flow meters are connected with the output ends of the standard air and the mass air control units through two-position three-way electromagnetic valves and are used for supplying air to the cold traps; The double-temperature-zone refrigerating/heating unit comprises two groups of cold trap modules A and B with independent functions, each cold trap module comprises a compressor (10) for refrigeration, two groups of heating units and two cold trap units, each cold trap unit comprises three cold trap pipes (12), and an upper opening and a lower opening of each cold trap pipe (12) are respectively provided with a two-position three-way electromagnetic valve or two-position two-way electromagnetic valves for controlling the flow direction of gas and/or liquid.
2. 2. The combined type multi-channel multi-cutting full-automatic ultralow temperature cold trap water removal system of claim 1, wherein the standard gas and quality control gas input unit is arranged on the right side above the rear panel of the case and comprises nine standard gas inlets (16) and a standard gas valve group (5) with nine electromagnetic valves, and the converging output ends are respectively connected with the gas supply pump of the secondary gas supply unit in parallel through two-position three-way electromagnetic valves.
3. 3. The combined type multipath multi-cutting full-automatic ultralow temperature cold trap water removal system is characterized in that the multipoint sampling unit is arranged on the left side above a rear panel of the case and comprises eight sample gas inlets (14) with different heights, eight sampling pipes, a sample gas valve group (3) with eight electromagnetic valves and an air inlet pump (6), and a multipoint sampling unit water-vapor separation device (8) is arranged behind the air inlet pump (6) and used for exhausting air from different heights to the front end of the primary air supply unit.
4. 4. The system of claim 1, further comprising a flow control and pressure balancing unit connected to the second temperature zone of the dual temperature zone refrigerating/heating unit, wherein the mass flowmeter is used to make the pressure balancing buffer overflow in the front and finally connected to the analyzer.
5. 5. The composite multipath multi-cutting full-automatic ultralow temperature cold trap water removal system of claim 1, further comprising a case, wherein the back plate of the case is provided with a sample gas inlet (14), a gas outlet (15), a standard gas inlet (16), a communication interface (17), an ice melting purging port (18) and a power interface (19), the sample gas inlet (14) is connected with a multipoint sampling unit and is connected with a bus in the case, the flow control and pressure balance unit is connected with an analyzer through the gas outlet (15), and the communication interface (17) is connected with an external control system.
6. 6. The system of claim 1, wherein the main control unit comprises a main control computer and two 32-bit relays, and is mainly used for switching gas paths, controlling refrigeration, controlling heating, controlling protection and communicating with other analyzers.

Description

Combined type multichannel multi-cutting full-automatic ultralow temperature cold trap water removal system Technical Field The invention belongs to the technical field of cold traps, and particularly relates to a combined multipath multi-cutting full-automatic ultralow temperature cold trap water removal system. Background Generally, we need to continuously draw the atmosphere with high precision greenhouse gas monitoring equipment for on-line measurement of target gases. But the water vapor content of different levels in the atmosphere can greatly influence the measurement precision and accuracy of the high-precision greenhouse gas monitoring equipment on target gas. Aiming at the high-precision greenhouse gas analyzer based on the spectrum technology at present, the World Meteorological Organization (WMO) clearly requires that the water vapor content in the target gas to be detected is lower than 500ppm, so that the high-level drying treatment is required to be carried out on the gas to be detected by professional equipment to obtain the gas to be detected with the water vapor content lower than 500ppm or lower. Aiming at atmospheric water removal, a low-temperature cold trap adopts more water removal devices at present. At present, a low-temperature cold trap device in the market mostly adopts a method of refrigerating by a semiconductor or a compressor, alternately removes water and ice from two cold traps, and the problems that the refrigerating efficiency is low, the cold traps are frequently switched, no sample pretreatment exists before the cold traps are switched, the water vapor exceeds the standard requirement after the cold traps are switched, the time consumption of the water vapor is reduced below 500ppm, the standard gas is too long, the standard gas cannot pass through the cold traps or the standard gas consumption is large, the stabilizing period is too long, the pressure change caused by the cold trap switching influences the measuring result and the like exist commonly, and the measurement of high-precision greenhouse gas is seriously influenced. Disclosure of Invention The invention aims to overcome the defects of the prior art and provides a combined type multipath multi-cutting full-automatic ultralow temperature cold trap water removal system. In order to achieve the above purpose, the invention adopts the following technical scheme: a combined multi-path multi-cutting full-automatic ultra-low temperature cold trap water removal system comprises 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 double-temperature-zone refrigerating/heating unit; The multi-point sampling unit, the primary air supply unit, the primary temperature area in the double-temperature-area refrigerating/heating unit, the secondary air supply unit and the secondary temperature area in the double-temperature-area refrigerating/heating unit are sequentially communicated. Preferably, the standard gas and quality control gas input unit is arranged on the right side above the rear panel of the case and comprises nine standard gas inlets and a standard gas valve group with nine electromagnetic valves, and the converging output end is respectively connected with the gas supply pump of the secondary gas supply unit in parallel through two-position three-way electromagnetic valves. Preferably, the multi-point sampling unit is arranged on the left side above the rear panel of the chassis and comprises eight sample gas inlets with different heights, eight sampling tubes, a sample gas valve group with eight electromagnetic valves and an air inlet pump, and a multi-point sampling unit water-vapor separation device is arranged behind the air inlet pump and used for exhausting air from different heights to the front end of the primary air supply unit. Preferably, the primary air supply unit comprises two micro air supply pumps, the front ends of the micro air supply pumps are connected to the air outlet ends of the water-gas separation devices of the multi-point sampling units, the rear ends of the micro air supply pumps are connected with a primary water removal coil arranged in the primary temperature zone, and the rear ends of the primary water removal coils are provided with a water-gas separator. Preferably, the secondary air supply unit comprises two micro air supply pumps and two floats or mass flow meters, the front ends of the two micro air supply pumps are respectively connected with the air outlet ends of the water-air separators of the two groups of primary water removal units through two-position three-way electromagnetic valves, the rear ends of the two micro air supply pumps are respectively connected with 1 float or mass flow meter, and then the two micro air supply pumps are connected with the output ends of the standard air supply unit and the mass air supply unit through two-position three-way electromagnetic valves f