A method and system for detecting gas pressure in argon recovery and purification process

Abstract

The present invention provides a method and system for detecting air pressure in an argon gas recovery and purification process, wherein the method comprises: before the preheating phase of the argon-using equipment begins, closing the first valve assembly of the first air pressure detection chamber arranged at the first air outlet of the argon-using equipment and closing the second valve assembly of the second air pressure detection chamber arranged at the second air outlet of the purification unit; after the preheating phase is completed, after a preset amount of argon gas is introduced into the argon-using equipment, opening the first valve assembly and the second valve assembly; detecting the air pressure in the first gas detection chamber to obtain a first air pressure value; detecting the air pressure in the second gas detection chamber to obtain a second air pressure value. The method and system for detecting air pressure in an argon gas recovery and purification process of the present invention realizes air pressure detection in the purification process and provides an analytical basis for the gas replenishment operation of the argon-using equipment.

Description

Technical Field

[0001] The present invention relates to the field of measurement technology, and in particular to a method and system for detecting gas pressure in an argon gas recovery and purification process. Background Art

[0002] During the production process of metal powder (e.g. titanium powder) used in 3D printing process, argon is used to protect the production process. Impurities will inevitably penetrate during the production process. If it is discharged directly, it will cause waste. The argon recovery and purification process can be recycled and reused, that is, the argon discharged from the argon equipment has an outlet pressure of 0-30Kpa, which is cooled to below 45°C by a cooler, and then passed through an argon compressor to increase the pressure to 0.8-1.3Mpa, and then passed through a buffer tank and a three-stage filter to remove trace oil and gas and solid impurities contained in the compressed argon. Then enter the purification unit. The purification unit is divided into three parts: deoxygenation unit, drying unit (also called water removal unit) and denitrification unit. The deoxygenation unit adopts a catalytic oxidation process to react the trace oxygen contained in the argon with the MnO loaded in the reactor to generate MnO2, so that the oxygen content in the argon is less than 1ppm. This process is called oxygen absorption process. The dehydration unit uses a molecular sieve dehydration process. This unit also contains at least two adsorption towers, which are filled with water-absorbing molecular sieves or other adsorption materials that preferentially adsorb water. When argon passes through the adsorption tower, the trace moisture contained in the argon is adsorbed, making the argon dry to a dew point below -65°C (water content below 5.35ppm) at normal pressure. The denitrification unit uses a zirconium-aluminum alloy. This material can adsorb other residual impurities in the argon at a high temperature of more than 250°C, including nitrogen, oxygen and water. Through this unit, the impurity content in the argon is controlled within the allowable range.

[0003] In actual use, if the gas volume of the entire argon recovery system is small and the circulating argon purity is good, the deoxygenation unit and the drying unit can be omitted, and the denitrification unit can be used directly to remove the impurity components in the argon, which can also meet the requirements.

[0004] The pressure of argon coming out of the purification unit is about 0.6-1.2Mpa, which often cannot meet the user's requirements, and needs to be pressurized by an argon compressor. First, the high-temperature argon coming out of the purification unit is cooled to the compressor inlet requirement (generally less than 45°C) by a cooler, and then compressed by the argon compressor to increase the pressure of the argon to the pressure required by the user's argon equipment. Then, it is passed through a heater to increase the temperature of the pressurized argon to the temperature required by the user's argon equipment, and then enters the user's argon equipment for use.

[0005] During the entire circulation process, due to factors such as loss and venting during the regeneration process, the air pressure of the entire circulation system will gradually decrease, and regular air replenishment is required; how to achieve air pressure detection during the purification process is the basis for the air replenishment action. Summary of the invention

[0006] One of the purposes of the present invention is to provide a method and system for detecting gas pressure during argon gas recovery and purification, so as to realize gas pressure detection during the purification process and provide an analytical basis for gas replenishment operation of argon equipment.

[0007] An embodiment of the present invention provides a method for detecting gas pressure in an argon gas recovery and purification process, comprising:

[0008] Before the preheating step of the argon-using device begins, close the first valve assembly of the first air pressure detection chamber arranged at the first air outlet of the argon-using device and close the second valve assembly of the second air pressure detection chamber arranged at the second air outlet of the purification unit;

[0009] After the preheating step is completed, a preset amount of argon is introduced into the argon-using equipment, and the first valve assembly and the second valve assembly are opened;

[0010] Detecting the air pressure in the first gas detection chamber to obtain a first air pressure value;

[0011] The air pressure in the second gas detection chamber is detected to obtain a second air pressure value.

[0012] Preferably, the first valve assembly comprises: a first air inlet valve and a first air outlet valve; the first air inlet valve and the first air outlet valve are both connected to the first air outlet.

[0013] Preferably, the second valve assembly comprises: a second air inlet valve and a second air outlet valve; the second air inlet valve and the second air outlet valve are both connected to the second air outlet.

[0014] Preferably, the method for detecting gas pressure during argon recovery and purification process further comprises:

[0015] At every preset first time interval, verification gas is introduced into the first air pressure detection chamber to perform detection and verification on the first air pressure detection module disposed in the first air pressure detection chamber.

[0016] Preferably, the method for detecting gas pressure during argon recovery and purification process further comprises:

[0017] At every preset second time interval, the verification gas is introduced into the second air pressure detection chamber to perform detection and verification on the second air pressure detection module arranged in the second air pressure detection chamber.

[0018] The present invention also provides an air pressure detection system in an argon gas recovery and purification process, comprising: a control module and a detection module; wherein, before the preheating phase of the argon-using equipment begins, the control module closes a first valve component of a first air pressure detection chamber arranged at a first air outlet of the argon-using equipment and closes a second valve component of a second air pressure detection chamber arranged at a second air outlet of the purification unit; after a preset amount of argon gas is introduced into the argon-using equipment after the preheating phase is completed, the control module opens the first valve component and the second valve component; the detection module detects the air pressure in the first gas detection chamber to obtain a first air pressure value, and detects the air pressure in the second gas detection chamber to obtain a second air pressure value.

[0019] Preferably, the first valve assembly comprises: a first air inlet valve and a first air outlet valve; the first air inlet valve and the first air outlet valve are both connected to the first air outlet.

[0020] Preferably, the second valve assembly comprises: a second air inlet valve and a second air outlet valve; the second air inlet valve and the second air outlet valve are both connected to the second air outlet.

[0021] Preferably, the air pressure detection system during the argon gas recovery and purification process further includes: a verification module, which is used to connect the verification gas to the first air pressure detection chamber at every preset first time interval to detect and verify the first air pressure detection module arranged in the first air pressure detection chamber.

[0022] Preferably, the air pressure detection system during the argon gas recovery and purification process further includes: a verification module, which is used to connect the verification gas to the second air pressure detection chamber at every preset second time interval to detect and verify the second air pressure detection module set in the second air pressure detection chamber.

[0023] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description and the accompanying drawings.

[0024] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0026] Figure 1 A schematic diagram of a method for detecting gas pressure in an argon gas recovery and purification process according to an embodiment of the present invention;

[0027] Figure 2 is a schematic diagram of a first air pressure detection chamber in an embodiment of the present invention;

[0028] Figure 3 Schematic diagram of a gas pressure detection system in an argon gas recovery and purification process in an embodiment of the present invention. DETAILED DESCRIPTION

[0029] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0030] The embodiment of the present invention provides a method for detecting gas pressure during argon gas recovery and purification. Figure 1 As shown, including:

[0031] Step 1: before the preheating step of the argon-using equipment begins, close the first valve assembly of the first air pressure detection chamber provided at the first air outlet of the argon-using equipment and close the second valve assembly of the second air pressure detection chamber provided at the second air outlet of the purification unit;

[0032] Step 2: After the preheating step is completed, a preset amount of argon is introduced into the argon-using equipment, and the first valve assembly and the second valve assembly are opened;

[0033] Step 3: Detect the air pressure in the first gas detection chamber to obtain a first air pressure value;

[0034] Step 4: Detect the air pressure in the second gas detection chamber to obtain a second air pressure value.

[0035] Wherein, the first valve assembly includes: a first air inlet valve and a first air outlet valve; the first air inlet valve and the first air outlet valve are both connected to the first air outlet.

[0036] Wherein, the second valve component comprises: a second air inlet valve and a second air outlet valve; the second air inlet valve and the second air outlet valve are both connected to the second air outlet.

[0037] The working principle and beneficial effects of the above technical solution are:

[0038] Argon equipment is a production equipment for producing metal powder. Argon gas discharged from the first outlet of the argon equipment will carry impurities, including oxygen, nitrogen, water, etc., and also contains some solid particles. The purification system includes: deoxygenation unit, drying unit (also called dehydration unit) and denitrification unit; the purification system has absorption, pressurization and other work in the treatment of gas, and pressure detection cannot be used as the analysis basis of gas replenishment operation; the gas replenishment operation can be performed by comprehensively analyzing the gas pressure conditions of the first gas outlet and the second gas outlet; the first gas outlet is the connection between the argon equipment and the purification system, the second gas outlet is the connection between the purification system and the argon equipment, and the second gas outlet is specifically the gas outlet of the cooler of the post-processing of the purification unit (because the purification unit comes out of high-temperature argon gas, it needs to be cooled to a certain temperature before measurement to have a guiding role); the second gas outlet is connected to the compressor and the heater, and its pressure is not suitable as the analysis basis of the gas replenishment operation; because the purification unit is used, the gas replenishment pipe and the vacuum pump are first used to perform multiple vacuum, argon gas replenishment and vacuumization processes on the argon recycling system, which corresponds to the preheating of the argon equipment In the process, there is no need to perform pressure detection at this time, and operations such as vacuuming may damage the detection part. Therefore, the first valve assembly and the second valve assembly are closed to seal the first air pressure detection chamber and the second detection chamber. After a preset amount (configured and stored by professionals) of argon gas is introduced into the argon equipment, that is, when the internal pressure does not cause damage to the detection unit, the first valve assembly and the second valve assembly are opened, and the gases from the first gas outlet and the second gas outlet flow into the first gas detection chamber and the second gas detection chamber respectively. The first air pressure value and the second air pressure value are detected by the detection components respectively arranged in the detection chambers. The specific gas replenishment operation is to sample the first air pressure value and the second air pressure value, and arrange the sampled data into a preset sampling template to obtain an analysis data set (the analysis data set is formed by arranging a preset number of sampling data in order), and use the analysis data set as an index keyword to determine the gas filling amount from a preset gas filling analysis database, and then perform a gas filling operation on the argon equipment according to the gas filling amount. Among them, the gas filling analysis database is analyzed and constructed in advance by professionals; the analysis data set in the database is associated with the gas filling amount in a one-to-one correspondence.

[0039] like Figure 2 As shown, the first gas detection chamber includes: a semicircular chamber 14; a first air inlet valve 11 is arranged on the first air inlet pipe; a first air outlet valve 12 is arranged on the first air outlet pipe; the air inlet of the first air inlet pipe and the air outlet of the first air outlet pipe are respectively arranged at the extended ends of the arc-shaped inner wall of the semicircular chamber 14; a detection component 15 (such as an electronic diaphragm barometer, an electronic barometer, etc.) for air pressure detection is arranged in the middle of the plane inner wall of the semicircular chamber 14; since the detection component 15 is arranged in the middle of the plane inner wall, the impact of the gas entering the detection chamber is avoided, and the accuracy of the detection is improved. The configuration of the second gas detection chamber is consistent with that of the first gas detection chamber, and no further explanation is given here.

[0040] Since the loss of argon is gradual when it circulates in the argon equipment and the recovery and purification unit, the gas filling operation needs to be configured with a time interval, and there is no need to frequently add gas, so as to avoid shortening the service life due to excessive use frequency of computing power and gas filling equipment. In terms of time control of the gas filling operation, it can be precisely the sampling time interval of the sampling data and the number of sampling data included in the analysis data set; in one embodiment, the gas pressure detection method in the argon gas recovery and purification process also includes:

[0041] Obtain control data and status monitoring data of argon equipment and purification units; wherein control data includes: switch instructions of each valve, movement instructions of each movable component, control instructions of each pressurizing equipment, etc.; status monitoring data includes: pressure monitoring data, flow monitoring data, voltage and current monitoring data, etc.;

[0042] Extract features from control data and condition monitoring data and construct time interval analysis vectors based on the extracted feature data;

[0043] The time interval analysis vector is matched with each standard analysis vector in the pre-configured interval analysis library, and the time interval corresponding to the standard analysis vector matching the time interval analysis vector is extracted; the interval analysis library is analyzed and configured by professionals in advance, and the standard analysis vectors in the library are associated with the time intervals one by one; the matching is to calculate the angle between the two vectors using the cosine angle calculation method, and when the angle is less than or equal to the preset threshold and is the smallest in the library, the two are matched. The time interval analysis vector represents the state of the equipment processing, and the appropriate sampling time interval is determined after comprehensive analysis, and then the timing of gas filling is controlled, that is, by controlling the sampling time of the air pressure detection process, the time of the gas filling operation is further controlled to ensure the use of argon gas in argon equipment.

[0044] In one embodiment, the method for detecting gas pressure during argon recovery and purification further includes:

[0045] At every preset first time interval, the verification gas is connected to the first air pressure detection chamber, and the first air pressure detection module arranged in the first air pressure detection chamber is tested and verified; and / or, at every preset second time interval, the verification gas is connected to the second air pressure detection chamber, and the second air pressure detection module arranged in the second air pressure detection chamber is tested and verified.

[0046] In order to ensure accurate and effective gas filling, the first thing is to ensure the accuracy of air pressure detection, by regularly performing accuracy verification of the detection components in the first air pressure detection chamber and the second gas detection chamber; specifically, verification gas is introduced through the third air inlet valve and the fourth air inlet valve arranged next to the first air inlet valve or the second air inlet valve, and the third air inlet valve and the fourth air inlet valve are one-way valves. During verification, the first air inlet valve and the first air outlet valve are closed, and the third air inlet valve is opened. Due to the one-way valve, the air pressure in the verification space connected to the first air pressure detection chamber and the third air inlet valve is balanced, and the detection value of the verification space detected by the standard gas detection component is compared with the detection value of the detection component in the first air pressure detection chamber to determine whether the detection component in the first air pressure detection chamber is normal; similarly, the detection component in the second air pressure detection chamber can also be verified;

[0047] like Figure 2 As shown, in order to avoid the influence of the third air intake valve 13 on the air intake of the first air pressure detection chamber during normal detection; the angle between the air intake passage of the third air intake valve 13 and the air intake passage of the first air intake valve 11 is less than or equal to 45 degrees;

[0048] In addition, the current operating status of the analytical argon equipment and the purification unit is verified based on the first interval time and the second interval time specified in the operating status table.

[0049] In order to further optimize the gas filling operation, in one embodiment, the gas pressure detection method in the argon gas recovery and purification process also includes: obtaining the gas filling time and gas filling amount of the preset number of gas filling operations before the current moment; constructing a negative feedback analysis data set based on the gas filling time and gas filling amount (forming by quantifying the gas filling time and sorting the gas filling amount in order); retrieving the sampling time interval correction value from the pre-configured sampling time interval analysis library based on the negative feedback analysis data set; and correcting the sampling time interval based on the sampling time interval correction value to make the time interval of data collection more reasonable. Among them, the smaller the amount of gas added each time, the larger the correction value, and the smaller the time interval of gas filling each time, the larger the correction value.

[0050] The present invention also provides a gas pressure detection system in the process of argon recovery and purification, such as Figure 3 As shown, it includes: a control module 1 and a detection module 2; wherein, before the preheating phase of the argon-using equipment begins, the control module 1 closes the first valve component of the first air pressure detection chamber arranged at the first air outlet of the argon-using equipment and closes the second valve component of the second air pressure detection chamber arranged at the second air outlet of the purification unit; after a preset amount of argon gas is introduced into the argon-using equipment after the preheating phase is completed, the control module 1 opens the first valve component and the second valve component; the detection module 2 detects the air pressure in the first gas detection chamber to obtain a first air pressure value, and detects the air pressure in the second gas detection chamber to obtain a second air pressure value.

[0051] Wherein, the first valve assembly includes: a first air inlet valve and a first air outlet valve; the first air inlet valve and the first air outlet valve are both connected to the first air outlet.

[0052] Wherein, the second valve component comprises: a second air inlet valve and a second air outlet valve; the second air inlet valve and the second air outlet valve are both connected to the second air outlet.

[0053] In one embodiment, the air pressure detection system during the argon gas recovery and purification process also includes: a verification module, which is used to connect the verification gas to the first air pressure detection chamber at every preset first time interval, and to detect and verify the first air pressure detection module arranged in the first air pressure detection chamber, and / or, which is used to connect the verification gas to the second air pressure detection chamber at every preset second time interval, and to detect and verify the second air pressure detection module arranged in the second air pressure detection chamber.

[0054] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for detecting gas pressure during argon recovery and purification, characterized in that: include: Before the preheating step of the argon-using device begins, close the first valve assembly of the first air pressure detection chamber arranged at the first air outlet of the argon-using device and close the second valve assembly of the second air pressure detection chamber arranged at the second air outlet of the purification unit; After the preheating step is completed, a preset amount of argon is introduced into the argon-using equipment, and the first valve assembly and the second valve assembly are opened; Detecting the air pressure in the first gas detection chamber to obtain a first air pressure value; Detecting the air pressure in the second gas detection chamber to obtain a second air pressure value; Wherein, the first valve assembly includes: a first air inlet valve and a first air outlet valve; the first air inlet valve and the first air outlet valve are both connected to the first air outlet; The second valve assembly includes: a second air inlet valve and a second air outlet valve; the second air inlet valve and the second air outlet valve are both connected to the second air outlet; The first gas detection chamber includes: a semicircular chamber; a first air inlet valve is arranged on the first air inlet pipe; a first air outlet valve is arranged on the first air outlet pipe; the air inlet of the first air inlet pipe and the air outlet of the first air outlet pipe are respectively arranged at the extended ends of the arc-shaped inner wall of the semicircular chamber; a detection component for air pressure detection is arranged in the middle of the plane inner wall of the semicircular chamber; the configuration of the second gas detection chamber is consistent with that of the first gas detection chamber.

2. The method for detecting gas pressure in the argon recovery and purification process according to claim 1, characterized in that: Also includes: At every preset first time interval, verification gas is introduced into the first air pressure detection chamber to perform detection and verification on the first air pressure detection module disposed in the first air pressure detection chamber.

3. The method for detecting gas pressure in the argon recovery and purification process according to claim 1, characterized in that: Also includes: At every preset second time interval, the verification gas is introduced into the second air pressure detection chamber to perform detection and verification on the second air pressure detection module arranged in the second air pressure detection chamber.

4. A gas pressure detection system in an argon gas recovery and purification process, characterized in that: include: A control module and a detection module; wherein, before the preheating phase of the argon-using device begins, the control module closes the first valve assembly of the first air pressure detection chamber arranged at the first air outlet of the argon-using device and closes the second valve assembly of the second air pressure detection chamber arranged at the second air outlet of the purification unit; after the preheating phase is completed, after a preset amount of argon gas is introduced into the argon-using device, the control module opens the first valve assembly and the second valve assembly; the detection module detects the air pressure in the first gas detection chamber to obtain a first air pressure value, and detects the air pressure in the second gas detection chamber to obtain a second air pressure value; Wherein, the first valve assembly includes: a first air inlet valve and a first air outlet valve; the first air inlet valve and the first air outlet valve are both connected to the first air outlet; The second valve assembly includes: a second air inlet valve and a second air outlet valve; the second air inlet valve and the second air outlet valve are both connected to the second air outlet; The first gas detection chamber includes: a semicircular chamber; a first air inlet valve is arranged on the first air inlet pipe; a first air outlet valve is arranged on the first air outlet pipe; the air inlet of the first air inlet pipe and the air outlet of the first air outlet pipe are respectively arranged at the extended ends of the arc-shaped inner wall of the semicircular chamber; a detection component for air pressure detection is arranged in the middle of the plane inner wall of the semicircular chamber; the configuration of the second gas detection chamber is consistent with that of the first gas detection chamber.

5. The gas pressure detection system in the argon recovery and purification process according to claim 4, characterized in that: Also includes: The verification module is used to connect the verification gas to the first air pressure detection chamber at every preset first time interval to detect and verify the first air pressure detection module arranged in the first air pressure detection chamber.

6. The gas pressure detection system in the argon recovery and purification process according to claim 4, characterized in that: Also includes: The verification module is used to connect the verification gas to the second air pressure detection chamber at every preset second time interval to detect and verify the second air pressure detection module set in the second air pressure detection chamber.

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