Device and method for accurately supplying freon and removing impurities

Abstract

A device and method for accurately supplying Freon to remove impurities, including a feeding container, a receiving container, and a purification container, the feeding container is connected to a container automatic switch Φ25 valve, the container automatic switch Φ25 valve is connected to a Φ valve of a feeding pipeline through a metal hose, the Φ10 valve of the feeding pipeline is connected to a feeding main pipe through two pipelines, the feeding main pipe is connected to a unit, and a VAT electric regulating valve, a throttling orifice plate, and an electric regulating valve A are installed on the feeding main pipe; and a detection instrument is connected to the feeding main pipe; the unit is connected to a receiving container through a receiving pipeline, the receiving container is placed in a condenser, and liquid nitrogen is poured in the condenser; there is an electric valve B on the receiving pipeline, the electric valve B is connected to the receiving container through a receiving container valve, and the receiving container and the purification container are connected in series and then connected to a vacuum pump; and there is a valve between the receiving container and the purification container. The present invention is remotely controlled by a VAT regulating valve, which reduces labor costs and reduces the intensity and difficulty of on-site operations.

Description

Technical Field

[0001] This patent relates to the field of isotope separation technology, and specifically to a device and method for accurate feeding of freon. Background Art

[0002] In order to ensure the safe and stable operation of the special equipment for isotope separation, the isotope separation plant needs to use Freon treatment to remove organic matter and moisture in the special equipment and related pipelines before the materials are introduced, and to eliminate dirt and impurities on the inner surface of the equipment and connecting pipelines. Freon treatment is carried out when the unit machine is running at high speed. Therefore, it is necessary to ensure the pressure of the feed main pipe and the receiving pressure to meet the necessary working pressure of the unit machine Freon treatment and avoid machine damage caused by the unit machine in the high-speed and high-pressure state. Only under the specified pressure can the Freon treatment effect be best, and various impurities inside the machine can be reduced to the maximum extent to ensure the quality and operating life of the machine after it is put into production. The traditional method of adjusting the feed pressure by manual valve cannot provide accurate pressure.

[0003] Freon feeding is the most critical link in the batch startup and commissioning of special equipment. Its feeding quality control will directly affect the quality of key technical indicators of the project. In the past commissioning, Freon feeding was manually controlled by the DN25 hand valve or DN10 hand valve at the outlet of the 24L container. The unit charging and pressure adjustment were achieved through micro-opening and micro-closing. Manual control relied on factors such as personnel experience, linkage between the site and the central control room, and personnel's proficiency in micro-opening and micro-closing valves. However, the original commissioning method has many shortcomings in actual use, such as:

[0004] 1. Freon charging is manually controlled by using a DN25 hand valve at the outlet of a 24L container in conjunction with a DN10 hand valve on the feed pipeline. The unit is charged by micro-opening and micro-closing. Manual control relies on personnel experience and the linkage between the site and the central control room to complete the charging. The site requires (3-4) operators per shift and 1 person in the control room.

[0005] 2. Manual control relies on personnel experience and the linkage between the site and the central control room. The entire filling process lasts for more than 48 hours, the pressure is adjusted frequently, and the on-site operators have a lot of operations to do;

[0006] 3. Manual control has a lag. During the Freon feeding process, the detection personnel in the central control room use the data detected by the on-site instruments to notify the on-site personnel to make adjustments. After the on-site adjustments, the control room signal feedback is used to wait for further instructions. Therefore, there is a time difference between the adjustment process and internal communication, and real-time dynamic adjustment cannot be achieved.

[0007] 4. During the Freon feeding process, frequent manual adjustments of the feeding valve and large opening and closing of the valve will cause system pressure fluctuations. Pressure imbalance will bring the risk of damage to special equipment during high-speed operation. Summary of the invention

[0008] The purpose of the present invention is to address the above-mentioned deficiencies in the prior art, to achieve precise control of Freon charging, to achieve remote control of Freon feeding, precise pressure regulation, real-time adjustment, reduce labor costs, and improve Freon charging quality control through automatic feeding.

[0009] The technical scheme of the present invention is as follows: a device for accurately feeding freon, comprising a feeding container, a receiving container, and a purification container, the feeding container is connected to a container automatic switch Φ25 valve, the container automatic switch Φ25 valve is connected to a Φ valve of a feeding pipeline through a metal hose, the Φ10 valve of the feeding pipeline is connected to a feeding main pipe through two pipelines, the feeding main pipe is connected to a unit, and a VAT electric regulating valve, a throttling orifice plate, and an electric regulating valve A are installed on the feeding main pipe; and a detection instrument is connected to the feeding main pipe; the unit is connected to a receiving container through a receiving pipeline, the receiving container is placed in a condenser, and liquid nitrogen is poured in the condenser; there is an electric valve B on the receiving pipeline, the electric valve B is connected to the receiving container through a receiving container valve, the receiving container and the purification container are connected in series and then connected to a vacuum pump; and there is a valve between the receiving container and the purification container.

[0010] There are multiple machines in the unit for gas exchange, reaction, separation and vacuuming.

[0011] A method for accurately supplying freon to remove impurities comprises the following steps:

[0012] Step 1: Vacuum freezing measurement of pipeline equipment;

[0013] Step 2, preparing the freon supply;

[0014] Step 2.1: Close the container switch Φ25 valve, VAT electric regulating valve, electric valve A, electric valve B, receiving container valve, and valve 7;

[0015] Step 2.2: Continue to cool down the unit;

[0016] Step 2.3: Start the machines in the unit, wait for all machines in the unit to reach the rated speed, and then run at no load;

[0017] Step 1: Adjust the freon feed pressure;

[0018] Step 3.1: Open the container switch Φ25 valve, VAT electric regulating valve, electric valve A, electric valve B, and valve in sequence, and the Freon gas evaporates from the supply container, is regulated by the VAT electric regulating valve, and then enters the supply main pipe after passing through the throttling orifice plate, and then supplies Freon to the unit;

[0019] Step 3.2: Monitor the pressure before and after the throttling orifice plate and the pressure of the inlet and outlet pipelines of the unit through the detection instrument, and make real-time corrections through the opening of the VAT electric regulating valve to ensure the pressure of the supply dry pipe and the receiving dry pipe;

[0020] Step 3.3: When the Freon gas pressure on the feed main reaches the action value of 600Pa, the electric valve is closed;

[0021] Step 4: Freon recovery and disposal: Open the vacuum pump and the receiving container valve, valve, and electric valve B to evacuate the contaminated Freon from the unit, and the contaminated Freon is condensed and recovered in the receiving container.

[0022] The step 1 comprises:

[0023] Step 1.1, evacuate the entire Freon precision feeding device to a pressure of ≤11Pa;

[0024] Step 1.2, connect the refrigeration device through the Φ10 valve of the feed pipeline, open the Φ10 valve and all valves of the entire Freon precise feed device, and balance the refrigeration device for 1 hour after connection;

[0025] Step 1.3, close the Φ10 valve, immerse the freezing device in a liquid nitrogen insulation barrel and freeze for 5 minutes, remove the liquid nitrogen insulation barrel and open the Φ10 valve to balance for 1 hour;

[0026] Step 1.4: Repeat step 1.3 and measure once every hour for 6 hours. If the pressure rise does not exceed 0.133Pa per hour, the vacuum sealing of the entire Freon precision feeding device is considered qualified.

[0027] In step 2.2, the operating temperature of the unit is adjusted to (15-20)°C, and (11-15)°C cooling water is required to continuously cool the unit.

[0028] In step 3.2, the feed flow rate is corrected in real time by the VAT electric regulating valve opening to ensure that the pressure of the feed main pipe is within the range of 450-580Pa and the pressure of the receiving main pipe is within the range of 3500-5800Pa.

[0029] In step 4, the remaining gas and impurities after the Freon is condensed and recovered are filtered in the purification container and discharged through the vacuum pump 15, while new Freon is continuously replenished through the supply container.

[0030] In step 4, the container switch Φ25 valve is closed to continuously evacuate the unit until the pressure inside the unit is no more than 26.6Pa.

[0031] The remarkable effects of the present invention are:

[0032] 1. Freon charging is remotely controlled through the VAT regulating valve, replacing on-site manual control. On-site personnel only need to monitor the system status and complete necessary purification operations, reducing labor costs;

[0033] 2. The unit is treated with Freon for at least 48 hours, and VAT regulating valve control replaces manual adjustment, which reduces the intensity and difficulty of on-site operation;

[0034] 3. Freon charging is remotely operated and precisely controlled by the electric regulating valve, which avoids the pressure fluctuation caused by human factors and improves the quality control of Freon charging;

[0035] 4. Remote control is fast and timely. When the unit machine rotates at high speed, the system pressure requirement is extremely high. Adjusting the system pressure within a safe range in real time can reduce the risk of damage to the special equipment during high-speed operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the device for accurately feeding freon according to the present invention;

[0037] In the figure, a feed container (1), a container switch Φ25 valve (2), a metal hose (3), a Φ10 valve (4) of a feed pipeline, a VAT electric regulating valve (5), a detection instrument (6), a throttling orifice plate (7), an electric valve A (8), a feed main pipe (9), a unit (10), a receiving container (11), a condenser (12), liquid nitrogen (13), a purification container (14), a vacuum pump (15), a receiving container valve (16), a valve (17), an electric valve B (18), and a receiving pipeline (19). DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] In the description of the present invention, it should be noted that the terms "upper / lower end", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0040] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "setting / sleeving", "sleeve connection", "connection", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] A device for accurately feeding freon, comprising a container, a pipeline, a valve, an instrument, a vacuum pump, and a unit; Figure 1 As shown, the container includes a feeding container 1, a receiving container 11, and a purification container 14. The feeding container 1 is connected to a container automatic switch Φ25 valve 2, and the container automatic switch Φ25 valve 2 is connected to a Φ10 valve 4 of a feeding pipeline through a metal hose 3. The Φ10 valve 4 of the feeding pipeline is connected to a feeding main pipe 9 through two pipelines. The feeding main pipe 9 is connected to a unit 10, and a VAT electric regulating valve 5, a throttling orifice plate 7, and an electric regulating valve A8 are installed on the feeding main pipe 9; and a detection instrument 6 is connected to the feeding main pipe 9;

[0042] Freon is used to remove light impurities such as organic matter and water on the inner surface of the machine in the unit 10; the machine in the unit 10 can perform gas exchange, reaction, separation, and vacuum.

[0043] The unit 10 is connected to the receiving container 11 through the receiving pipeline 19. The receiving container 11 is placed in the condenser 12. The liquid nitrogen 13 is poured in the condenser 12. There is an electric valve B18 on the receiving pipeline 19. The electric valve B18 is connected to the receiving container 11 through the receiving container valve 16. The receiving container 11 and the purification container 14 are connected in series and then connected to the vacuum pump 15. There is a valve 17 between the receiving container 11 and the purification container 14.

[0044] A method for accurately supplying freon to remove impurities comprises the following steps:

[0045] Step 1: Vacuum freezing measurement of pipeline equipment;

[0046] Step 1.1, after all pipelines and equipment are correctly connected, use the freezing measurement method to test. Evacuate the pipelines and equipment of the entire Freon precision feeding device to a pressure of ≤11Pa;

[0047] Step 1.2, connect the refrigeration device through the Φ10 valve 4 of the feed pipeline, open the Φ10 valve 4 and open all valves of the entire Freon precise feed device, and balance the refrigeration device for 1 hour after connection;

[0048] Step 1.3, close the Φ10 valve 4, immerse the freezing device in the liquid nitrogen insulation barrel and freeze for 5 minutes to measure and record the pressure, remove the liquid nitrogen insulation barrel and open the Φ10 valve to balance for 1 hour;

[0049] Step 1.4, repeat step 1.3, measure once every hour, measure for 6 hours, if the pressure rise does not exceed 0.133Pa per hour, the vacuum tightness of the entire Freon precise feeding device is considered qualified. If the freezing measurement value is unqualified, it is necessary to find and eliminate the leak and then re-measure the freezing.

[0050] Step 2, preparing the freon supply;

[0051] Step 2.1: After the freezing measurement is qualified, close the container switch Φ25 valve 2, VAT electric regulating valve 5, electric valve A8, electric valve B18, valve 16, valve 17;

[0052] Step 2.2: The unit is under an operating temperature of (15-20)℃ and (11-15)℃ cooling water is required to continuously cool the unit;

[0053] Step 2.3: Start the machines in the unit 10, and wait for all the machines in the unit 10 to reach the rated speed and run at no load for no less than 1.5 hours;

[0054] Step 3, regulating the freon supply pressure;

[0055] Step 3.1: Open the container switch Φ25 valve 2, VAT electric regulating valve 5, electric valve A8, electric valve B18, valve 17 in sequence, and the Freon gas evaporates from the supply container 1, is regulated by the VAT electric regulating valve 5, passes through the throttling orifice plate 7, and then enters the supply main pipe 9, and then supplies Freon to the unit 10;

[0056] Step 3.2: The pressure is adjusted by changing the opening of the electric control valve, that is, the process of changing the fluid flow to control the pressure. Since the valve body uses a cam mechanism for linear compensation, the opening and flow of the electric control valve meet the percentage flow characteristics. That is, the valve opening is directly proportional to the logarithm of the relative flow, and the mathematical expression is:

[0057]

[0058] In the formula: R = Qmax / Qmin is the adjustable ratio of the electric control valve; q is the relative flow rate; L is the actual opening of the electric control valve; Lmax is the maximum opening of the electric control valve.

[0059] The controller adjusts according to the deviation between the pressure return value and the set value. The controller adopts the traditional PID control algorithm. The output PWM control signal controls the motor forward and reverse rotation and motor speed through the power drive circuit, thereby achieving the purpose of controlling the valve opening and further realizing precise control of the controlled pressure.

[0060] Step 3.3 In order to keep the flow rate of the material flow stable, a throttling orifice plate 7 is set. Freon passes through the trumpet-shaped circular hole of the throttling orifice plate 7 through the VAT electric regulating valve 5. When the pressure before and after the throttling orifice plate 7 meets the orifice sound velocity condition, the flow rate of the gas passing through the throttling orifice plate 7 is proportional to the pressure before the orifice plate. The pressure before the feed orifice plate 7 is adjusted by the VAT electric regulating valve 5 to ensure the feed flow rate, the feed main pipe 9, and the receiving main pipe 19.

[0061] Step 3.4

[0062] The pressure before and after the throttling orifice plate 7 and the pressure of the inlet and outlet pipelines of the unit 10 are monitored by the detection instrument 6. The pressure parameters can be monitored in real time by the central control through the monitoring control system to ensure that the pressure parameters are within the controlled range. The opening of the VAT electric regulating valve 5 is used to correct the feed flow in real time to ensure that the pressure of the feed main pipe 9 is within the range of 450-580Pa, and the pressure of the receiving main pipe 19 is within the range of 3500-5800Pa for Freon treatment;

[0063] Step 3.5: The Freon system provides an accident protection function. A pressure accident protection sensor is installed on the supply main pipe 9. When the Freon gas pressure on the supply main pipe reaches the action value of 600Pa, an accident signal is issued, and the electric valve 8 is quickly closed to temporarily stop the Freon supply.

[0064] Step 4: Freon recovery and disposal;

[0065] Step 4.1: Open the vacuum pump 15 and valve 16, valve 17, and electric valve B18 to evacuate the contaminated Freon (mixed gas formed by Freon gas and impurities after entering the pipeline and the unit) from the unit 10, and the contaminated Freon is condensed by liquid nitrogen 13 in the condenser 12 and recovered in the receiving container 11;

[0066] Step 4.2: After the Freon is condensed and recovered, the remaining gas and impurities are filtered in the purification container 14 and discharged through the vacuum pump 15. At the same time, new Freon is continuously replenished through the feed container 1. The Freon treatment time is not less than 48 hours;

[0067] Step 4.3: Close the container switch Φ25 valve 4 to continuously evacuate the unit 10 until the pressure in the unit 10 is no more than 26.6 Pa, and the Freon treatment is completed.

[0068] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions. The sentence "includes an element defined by ... does not exclude the existence of other identical elements in the process, method, article or device including the element".

[0069] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for accurately feeding freon, characterized in that: The invention comprises a feeding container (1), a receiving container (11), and a purification container (14); the feeding container (1) is connected to a container automatic switch Φ25 valve (2); the container automatic switch Φ25 valve (2) is connected to a Φ10 valve (4) of a feeding pipeline through a metal hose (3); the Φ10 valve (4) of the feeding pipeline is connected to a feeding main pipe (9) through two pipelines; the feeding main pipe (9) is connected to a unit (10); and a VAT electric regulating valve (5), a throttling orifice plate (7), and an electric regulating valve A (8) are installed on the feeding main pipe (9); and a detection valve (5) is connected to the feeding main pipe (9). The unit (10) is connected to a material receiving container (11) through a material receiving pipeline (19), the material receiving container (11) is placed in a condenser (12), and liquid nitrogen (13) is poured in the condenser (12); an electric valve B (18) is provided on the material receiving pipeline (19), the electric valve B (18) is connected to the material receiving container (11) through a material receiving container valve (16), the material receiving container (11) and the purification container (14) are connected in series and then connected to a vacuum pump (15); and a valve (17) is provided between the material receiving container (11) and the purification container (14).

2. The device for accurately feeding freon according to claim 1, characterized in that: The unit (10) includes a plurality of machines for gas exchange, reaction, separation and evacuation.

3. A method for accurately supplying Freon to remove impurities, using the device for accurately supplying Freon as claimed in claim 2, characterized in that: The following steps are involved: Step 1: Vacuum freezing measurement of pipeline equipment; Step 2, preparing the freon supply; Step 2.1: Close the container switch Φ25 valve (2), VAT electric regulating valve (5), electric valve A (8), electric valve B (18), receiving container valve (16), and valve (17); Step 2.2: Continuously cooling the unit (10); Step 2.3: Start the machines in the unit (10), wait for all the machines in the unit (10) to reach the rated speed, and then run at no load; Step 3, regulating the freon supply pressure; Step 3.1: The container switch Φ25 valve (2), VAT electric regulating valve (5), electric valve A (8), electric valve B (18), and valve (17) are opened successively, and the Freon gas evaporates from the supply container 1, is regulated by the VAT electric regulating valve (5), and then passes through the throttling orifice plate (7) and enters the supply main pipe (9), and then supplies Freon to the unit (10); Step 3.2: The pressures before and after the throttling orifice plate (7) and the pressures of the inlet and outlet pipelines of the unit (10) are monitored by the detection instrument (6), and the opening of the VAT electric regulating valve (5) is corrected in real time to ensure the pressures of the supply main pipe (9) and the receiving main pipe (19); Step 3.3: When the Freon gas pressure on the supply main pipe (9) reaches the action value of 600Pa, the electric valve B (8) is closed; Step 4, Freon recovery and disposal; open the vacuum pump (15) and the material receiving container valve (16), valve (17), and electric valve B (18), evacuate the contaminated Freon from the unit (10), and condense the contaminated Freon and recover it in the material receiving container (11).

4. The method for accurately supplying Freon to remove impurities according to claim 3, characterized in that: The step 1 comprises: Step 1.1, evacuate the entire Freon precision feeding device to a pressure of ≤11Pa; Step 1.2, connect the refrigeration device through the Φ10 valve (4) of the supply pipeline, open the Φ10 valve (4) and open all valves of the entire Freon precise supply device, and balance the refrigeration device for 1 hour after connection; Step 1.3, close the Φ10 valve (4), immerse the freezing device in a liquid nitrogen insulation barrel and freeze for 5 minutes, remove the liquid nitrogen insulation barrel and open the Φ10 valve (4) to balance for 1 hour; Step 1.4: Repeat step 1.3 and measure once every hour for 6 hours. If the pressure rise does not exceed 0.133Pa per hour, the vacuum sealing of the entire Freon precision feeding device is considered qualified.

5. The method for accurately supplying Freon to remove impurities according to claim 3, characterized in that: In step 2.2, the operating temperature of the unit (10) is adjusted to (15-20)°C, and cooling water at (11-15)°C is provided to continuously cool the unit (10).

6. The method for accurately supplying Freon to remove impurities according to claim 3, characterized in that: In step 3.2, the feed flow rate is corrected in real time by the opening of the VAT electric regulating valve (5) to ensure that the pressure of the feed main pipe (9) is within the range of 450-580Pa and the pressure of the receiving main pipe (19) is within the range of 3500-5800Pa.

7. The method for accurately supplying Freon to remove impurities according to claim 3, characterized in that: In step 4, the remaining gas and impurities after the Freon is condensed and recovered are filtered in the purification container (14) and discharged through the vacuum pump (15), while new Freon is continuously replenished through the supply container (1).

8. The method for accurately supplying Freon to remove impurities according to claim 7, characterized in that: In the step 4, the container switch Φ25 valve (4) is closed to continuously evacuate the unit (10) until the pressure in the unit (10) is no greater than 26.6 Pa.

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