CN109854952B - Gas pressure adjusting method - Google Patents
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Abstract
本发明公开了一种气体压力调节方法，应用于气体压力调节系统，系统包括：气源、增压泵、两通电磁阀、液体压力控制器、三通电磁阀以及控制系统，判断目标压力是否大于调节系统当前输出压力；若是，在当前输出压力高于气体临界压力时，利用液压控制器将当前输出压力调节至目标压力；在当前输出压力和目标压力均低于气体临界压力时，将液体压力控制器中的压力调至目标压力的第一预设数量倍，再将当前输出压力调节至目标压力。在当前输出压力低于临界压力，目标压力高于气体临界压力时，将液体压力控制器中的压力调节至临界压力以上，然后将气体压力调节系统的当前输出压力调节至目标压力。应用本发明实施例，可以实现液体压力的跨液化点调节。
The invention discloses a gas pressure regulating method, which is applied to a gas pressure regulating system. The system comprises: a gas source, a booster pump, a two-way solenoid valve, a liquid pressure controller, a three-way solenoid valve and a control system, which judges whether a target pressure is is greater than the current output pressure of the regulating system; if it is, when the current output pressure is higher than the gas critical pressure, the hydraulic controller is used to adjust the current output pressure to the target pressure; when the current output pressure and target pressure are both lower than the gas critical pressure, the liquid The pressure in the pressure controller is adjusted to a first preset number of times the target pressure, and then the current output pressure is adjusted to the target pressure. When the current output pressure is lower than the critical pressure and the target pressure is higher than the gas critical pressure, the pressure in the liquid pressure controller is adjusted to be above the critical pressure, and then the current output pressure of the gas pressure regulating system is adjusted to the target pressure. By applying the embodiments of the present invention, it is possible to realize the regulation of the liquid pressure across the liquefaction point.
Description
技术领域technical field
本发明涉及一种压力调节方法，更具体涉及一种气体压力调节方法。The present invention relates to a pressure regulation method, and more particularly to a gas pressure regulation method.
背景技术Background technique
提高压力控制精度需要依托压力控制器，目前压力控制器分为气体压力控制器和液体压力控制，分别针对介质为气态和液态时使用。众所周知，当气体压力进一步提升到临界压力时，会变成液态。例如，二氧化碳超临界压力值为7.4MPa，也就是说压力在7.4MPa以下呈气体状态，压力在7.4MPa以上为液体状体。为实现高精度压力控制，当介质处于气体状态时，需要用气体压力控制器；介质处于液体状态时，需要用液体压力控制器。如果单纯用气体压力控制器的话，液体状态时精度不能保证(因为气体的压缩比很大，液体状态下，气体控制器的压缩活塞稍微运动就会引起液体压力很大变化)；如果仅用液体压力控制器的话，其有限的压缩范围不能使气体压力压缩至预定目标压力值。To improve the pressure control accuracy, it is necessary to rely on a pressure controller. At present, the pressure controller is divided into a gas pressure controller and a liquid pressure controller, which are used when the medium is gaseous and liquid. As we all know, when the gas pressure is further increased to the critical pressure, it will become liquid. For example, the supercritical pressure value of carbon dioxide is 7.4 MPa, that is to say, the pressure is below 7.4 MPa, and it is in a gaseous state, and when the pressure is above 7.4 MPa, it is in a liquid state. In order to achieve high-precision pressure control, when the medium is in a gas state, a gas pressure controller is required; when the medium is in a liquid state, a liquid pressure controller is required. If the gas pressure controller is simply used, the accuracy cannot be guaranteed in the liquid state (because the compression ratio of the gas is very large, in the liquid state, a slight movement of the compression piston of the gas controller will cause a large change in the liquid pressure); if only the liquid is used In the case of a pressure controller, its limited compression range cannot compress the gas pressure to a predetermined target pressure value.
发明人发现，由于液体压力控制器的压缩范围较小，无法使用液体压力控制器大范围调节气体的压力；而且气体压力控制器具有很大的压缩比，当介质转变为液态后，压缩活塞的轻微运动就会引起液体压力的巨大波动，无法保证液体状态时的压力精度。因此，导致现有技术存在气体压力调节范围不能跨液化点实现压力调节的技术问题。The inventor found that, due to the small compression range of the liquid pressure controller, it is impossible to use the liquid pressure controller to adjust the pressure of the gas in a wide range; and the gas pressure controller has a large compression ratio. A slight movement will cause huge fluctuations in the liquid pressure, and the pressure accuracy in the liquid state cannot be guaranteed. Therefore, there is a technical problem in the prior art that the gas pressure regulation range cannot achieve pressure regulation across the liquefaction point.
发明内容SUMMARY OF THE INVENTION
本发明所要解决的技术问题在于提供了一种气体压力调节方法，以实现气体压力的跨液化点时的压力调节。The technical problem to be solved by the present invention is to provide a gas pressure regulation method, so as to realize the pressure regulation when the gas pressure crosses the liquefaction point.
本发明是通过以下技术方案解决上述技术问题的：The present invention solves the above-mentioned technical problems through the following technical solutions:
本发明实施例提供了一种气体压力调节方法，应用于气体压力调节系统，所述系统包括：气源、增压泵、两通电磁阀、液体压力控制器、三通电磁阀以及控制系统，其中，所述气源、所述增压泵、所述两通电磁阀、所述液体压力控制器、所述三通电磁阀依次连接；所述两通电磁阀、所述液体压力控制器、所述三通电磁阀均与控制电脑通讯连接；An embodiment of the present invention provides a method for regulating gas pressure, which is applied to a gas pressure regulating system. The system includes: a gas source, a booster pump, a two-way solenoid valve, a liquid pressure controller, a three-way solenoid valve, and a control system, Wherein, the air source, the booster pump, the two-way solenoid valve, the liquid pressure controller, and the three-way solenoid valve are connected in sequence; the two-way solenoid valve, the liquid pressure controller, The three-way solenoid valves are all connected with the control computer in communication;
所述方法包括：The method includes:
使用所述增压泵将增压泵与两通电磁阀之间的压力提升至气体临界压力的设定数量倍；再获取目标压力，并根据所述目标压力以及所述气体压力调节系统当前输出压力，判断所述目标压力是否大于所述气体压力调节系统的当前输出压力；Use the booster pump to increase the pressure between the booster pump and the two-way solenoid valve to a set number of times the critical gas pressure; then obtain the target pressure, and adjust the current output of the system according to the target pressure and the gas pressure pressure, to determine whether the target pressure is greater than the current output pressure of the gas pressure regulation system;
若是，在所述当前输出压力高于所述气体的临界压力时，直接利用所述液体压力控制器将液化的气体压力调节至所述目标压力；在所述当前输出压力和目标压力均低于所述气体的临界压力时，开启所述两通电磁阀，将所述液体压力控制器中的压力调节至所述目标压力的第一预设数量倍，然后，利用所述液体压力控制器将所述气体压力调节系统的当前输出压力调节至所述目标压力；在当前输出压力低于临界压力，而目标压力高于气体临界压力时，打开所述两通电磁阀，使用增压泵将液体压力控制器中的压力调节至临界压力以上至第一设定压力，然后利用液体压力控制器将当前输出压力调节至目标压力，其中，所述第一预设数量小于1，且第一预设数量与所述目标压力之积位于所述液体压力控制器的调压范围内。If so, when the current output pressure is higher than the critical pressure of the gas, directly use the liquid pressure controller to adjust the pressure of the liquefied gas to the target pressure; when both the current output pressure and the target pressure are lower than When the critical pressure of the gas is reached, the two-way solenoid valve is opened, the pressure in the liquid pressure controller is adjusted to a first preset number of times the target pressure, and then the liquid pressure controller is used to The current output pressure of the gas pressure regulating system is adjusted to the target pressure; when the current output pressure is lower than the critical pressure and the target pressure is higher than the gas critical pressure, the two-way solenoid valve is opened, and the liquid is pumped by a booster pump. The pressure in the pressure controller is adjusted to above the critical pressure to the first set pressure, and then the current output pressure is adjusted to the target pressure by using the liquid pressure controller, wherein the first preset number is less than 1, and the first preset The product of the quantity and the target pressure is within the pressure regulation range of the liquid pressure controller.
可选的，在所述判断所述目标压力是否大于所述气体压力调节系统的当前输出压力的判断结果为否的情况下，所述方法还包括：Optionally, in the case where the judging result of judging whether the target pressure is greater than the current output pressure of the gas pressure regulating system is no, the method further includes:
在所述目标压力高于所述气体临界压力时，利用所述液体压力控制器将所述气体压力调节系统的当前输出压力调节至所述目标压力；在所述目标压力低于所述气体临界压力，且所述目标压力与第二预设数量之积高于所述气体临界压力时，开启所述三通电磁阀将所述液体压力控制器中的压力泄压至所述气体临界压力以下至第二设定压力，然后，利用所述液体压力控制器将所述气体压力调节系统的当前输出压力调节至所述目标压力；在所述目标压力低于所述气体临界压力，且所述目标压力与第二预设数量之积低于所述气体临界压力时，开启所述三通电磁阀，将所述液体压力控制器的压力降至所述目标压力与第二预设数量之积处，利用所述液体压力控制器将所述气体压力调节系统的当前输出压力调节至所述目标压力，其中，所述第二预设数量大于1，且第二预设数量与所述目标压力之积位于所述液体压力控制器的调压范围内。When the target pressure is higher than the gas critical pressure, the liquid pressure controller is used to adjust the current output pressure of the gas pressure regulation system to the target pressure; when the target pressure is lower than the gas critical pressure When the product of the target pressure and the second preset amount is higher than the gas critical pressure, open the three-way solenoid valve to release the pressure in the liquid pressure controller to below the gas critical pressure to the second set pressure, and then use the liquid pressure controller to adjust the current output pressure of the gas pressure regulation system to the target pressure; when the target pressure is lower than the gas critical pressure, and the When the product of the target pressure and the second preset quantity is lower than the gas critical pressure, open the three-way solenoid valve to reduce the pressure of the liquid pressure controller to the product of the target pressure and the second preset quantity At , the liquid pressure controller is used to adjust the current output pressure of the gas pressure regulating system to the target pressure, wherein the second preset number is greater than 1, and the second preset number is the same as the target pressure The product is within the pressure regulation range of the liquid pressure controller.
可选的，所述气源为二氧化碳气源。Optionally, the gas source is a carbon dioxide gas source.
本发明相比现有技术具有以下优点：Compared with the prior art, the present invention has the following advantages:
应用本发明实施例，在当前输出压力和目标压力高于气体临界压力时，使用液体压力控制器将气体压力调节系统的当前输出压力调节至目标压力；在当前输出压力或目标压力低于气体临界压力时，利用电磁阀以及增压泵将液体压力控制器中的压力调节至液体压力控制器的调节范围内，然后利用液体压力控制器将气体压力调节系统的当前输出压力调节至目标压力，因此，可以通过液体压力控制器进行气体的跨液化点调节。Applying the embodiment of the present invention, when the current output pressure and the target pressure are higher than the gas critical pressure, the liquid pressure controller is used to adjust the current output pressure of the gas pressure regulation system to the target pressure; when the current output pressure or the target pressure is lower than the gas critical pressure At the time of pressure, use the solenoid valve and booster pump to adjust the pressure in the liquid pressure controller to the adjustment range of the liquid pressure controller, and then use the liquid pressure controller to adjust the current output pressure of the gas pressure regulation system to the target pressure, so , which can be adjusted across the liquefaction point of the gas by the liquid pressure controller.
附图说明Description of drawings
图1为本发明实施例提供的一种气体压力调节方法的流程示意图；1 is a schematic flowchart of a gas pressure regulating method provided by an embodiment of the present invention;
图2为本发明实施例提供的一种气体压力调节方法的原理示意图；2 is a schematic diagram of the principle of a gas pressure regulating method provided by an embodiment of the present invention;
图3为本发明实施例提供的一种气体压力调节系统的结构示意图。FIG. 3 is a schematic structural diagram of a gas pressure regulating system according to an embodiment of the present invention.
具体实施方式Detailed ways
下面对本发明的实施例做详细说明，本实施例在以本发明技术方案为前提下进行实施，给出了详细的实施方式和具体的操作过程，但本发明的保护范围不限于下述的实施例。The embodiments of the present invention will be described in detail below. This embodiment is implemented on the premise of the technical solution of the present invention, and provides detailed implementation modes and specific operation processes, but the protection scope of the present invention is not limited to the following implementations example.
图1为本发明实施例提供的一种气体压力调节方法的流程示意图；图2为本发明实施例提供的一种气体压力调节方法的原理示意图，图3为本发明实施例提供的一种气体压力调节系统的结构示意图。如图1-3所示，应用于气体压力调节系统，所述系统包括：气源、增压泵、两通电磁阀、液体压力控制器、三通电磁阀以及控制系统，其中，所述气源、所述增压泵、所述两通电磁阀、所述液体压力控制器、所述三通电磁阀依次连接；所述两通电磁阀、所述液体压力控制器、所述三通电磁阀均与控制电脑通讯连接；FIG. 1 is a schematic flowchart of a gas pressure adjustment method provided by an embodiment of the present invention; FIG. 2 is a schematic schematic diagram of a gas pressure adjustment method provided by an embodiment of the present invention, and FIG. 3 is a gas pressure adjustment method provided by an embodiment of the present invention. Schematic diagram of the structure of the pressure regulation system. As shown in Figures 1-3, it is applied to a gas pressure regulation system, the system includes: a gas source, a booster pump, a two-way solenoid valve, a liquid pressure controller, a three-way solenoid valve and a control system, wherein the gas The source, the booster pump, the two-way solenoid valve, the liquid pressure controller, and the three-way solenoid valve are connected in sequence; the two-way solenoid valve, the liquid pressure controller, the three-way solenoid valve The valves are all connected with the control computer;
所述方法包括：The method includes:
S101：使用所述增压泵将增压泵(内置高压存储罐)与两通电磁阀之间的压力提升至气体临界压力的设定数量倍；再获取目标压力，并根据所述目标压力以及所述气体压力调节系统的当前输出压力，判断所述目标压力是否大于所述气体压力调节系统的当前输出压力；在S101步骤的判断结果为是的情况下，执行S102步骤；在S101步骤的判断结果为否的情况下，执行S103步骤(图中未示出)；S101: Use the booster pump to boost the pressure between the booster pump (built-in high-pressure storage tank) and the two-way solenoid valve to a set number of times the gas critical pressure; then obtain a target pressure, and determine the target pressure according to the target pressure and The current output pressure of the gas pressure regulating system is to determine whether the target pressure is greater than the current output pressure of the gas pressure regulating system; if the judgment result in step S101 is yes, step S102 is executed; the judgment in step S101 If the result is no, step S103 is performed (not shown in the figure);
例如，以二氧化碳气体为例，可以使用增压泵预先将增压泵与两通电磁阀之间的管道内的压力提升至12MPa，然后判断目标压力是否大于气体压力调节系统的当前输出压力，例如，我们的目标压力为10MPa，当前输出压力为6MPa，则执行S102步骤。For example, taking carbon dioxide gas as an example, you can use a booster pump to boost the pressure in the pipeline between the booster pump and the two-way solenoid valve to 12MPa in advance, and then judge whether the target pressure is greater than the current output pressure of the gas pressure regulation system, for example , our target pressure is 10MPa, and the current output pressure is 6MPa, then step S102 is performed.
S102：在所述当前输出压力已高于所述气体临界压力时，利用所述液体压力控制器将自身中液化气体的压力调节至所述目标压力；在所述当前输出压力和目标压力均低于所述气体的临界压力时，需要开启所述两通电磁阀，使用增压泵将所述液体压力控制器中的压力调节至所述目标压力的第一预设数量倍，然后，利用所述液体压力控制器将所述气体压力调节系统的当前输出压力调节至所述目标压力；在所述当前输出压力低于气体临界压力，而目标压力高于气体临界压力时，开启所述两通电磁阀，使用增压泵将所述液体压力控制器内压力升至临界压力以上至第一设定压力，使气体液化后，利用所述液体压力控制器将所述气体压力调节系统的当前输出压力调节至所述目标压力，其中，所述第一预设数量小于1，且第一预设数量与所述目标压力之积位于所述液体压力控制器的调压范围内。S102: When the current output pressure is higher than the gas critical pressure, use the liquid pressure controller to adjust the pressure of the liquefied gas in itself to the target pressure; when both the current output pressure and the target pressure are low At the critical pressure of the gas, it is necessary to open the two-way solenoid valve, use a booster pump to adjust the pressure in the liquid pressure controller to a first preset number of times the target pressure, and then use the The liquid pressure controller adjusts the current output pressure of the gas pressure regulating system to the target pressure; when the current output pressure is lower than the gas critical pressure and the target pressure is higher than the gas critical pressure, the two-way is opened Solenoid valve, use the booster pump to raise the pressure inside the liquid pressure controller to above the critical pressure to the first set pressure, after liquefying the gas, use the liquid pressure controller to adjust the current output of the gas pressure control system The pressure is adjusted to the target pressure, wherein the first preset number is less than 1, and the product of the first preset number and the target pressure is within the pressure regulation range of the liquid pressure controller.
具体的，气源可以采用普通的二氧化碳气瓶；电动增压泵(如APC950型增压泵)，用于为气体压力调节系统提供一个较高压力环境源，可将二氧化碳气体加压至12兆帕左右，呈液体状体，增压泵精度1％；两通电磁阀和三通电磁阀就是市售的耐高压的电磁阀，可根据控制电脑的指令进行开关操作；压力控制器为液体压力控制器，系统自带高精度压力控制系统，精度优于万分之五；控制电脑为常规电脑，以二氧化碳气体为例，对本发明实施例的工作过程说明如下：Specifically, the gas source can be an ordinary carbon dioxide gas cylinder; an electric booster pump (such as APC950 type booster pump) is used to provide a higher pressure environment source for the gas pressure regulation system, which can pressurize the carbon dioxide gas to 12 trillion It is a liquid body, the accuracy of the booster pump is 1%; the two-way solenoid valve and the three-way solenoid valve are commercially available high-pressure solenoid valves, which can be switched on and off according to the instructions of the control computer; the pressure controller is liquid pressure The controller, the system comes with a high-precision pressure control system, the accuracy is better than 5/10,000; the control computer is a conventional computer, taking carbon dioxide gas as an example, the working process of the embodiment of the present invention is described as follows:
升压过程(目标压力高于当前输出压力的情况下)：Boosting process (when the target pressure is higher than the current output pressure):
1、在当前输出压力为7.4MPa，或者当前输出压力高于7.4MPa以上时(介质呈液体状态)，就直接利用液体压力控制器来实现压力调节(精度为万分之五)。1. When the current output pressure is 7.4MPa, or when the current output pressure is higher than 7.4MPa (the medium is in a liquid state), the liquid pressure controller is directly used to realize the pressure adjustment (the accuracy is 5/10,000).
2、在当前输出压力低于7.4MPa时(介质呈气体状态)，需要再判断目标压力是否大于气体的临界压力7.4MPa，若是，开启所述两通电磁阀，使用增压泵将所述液体压力控制器内压力升至第一设定压力如，7.5MPa，或者第一设定压力可以为气体临界压力的设定倍数处，如1.1倍，或者1.5倍等，使二氧化碳气体液化后利用液体压力控制器将所述气体压力调节系统的当前输出压力调节至所述目标压力。原则上讲，第一设定压力可以高于目标压力，比如目标压力为7.41MPa，第一设定压力为7.5MPa也可以。2. When the current output pressure is lower than 7.4MPa (the medium is in a gas state), it is necessary to judge whether the target pressure is greater than the critical pressure of the gas, which is 7.4MPa. If so, open the two-way solenoid valve and use a booster pump to pump the liquid. The pressure in the pressure controller rises to the first set pressure, such as 7.5MPa, or the first set pressure can be a set multiple of the gas critical pressure, such as 1.1 times, or 1.5 times, etc., so that the carbon dioxide gas is liquefied and then the liquid is used. A pressure controller regulates the current output pressure of the gas pressure regulation system to the target pressure. In principle, the first set pressure can be higher than the target pressure, for example, the target pressure is 7.41MPa, and the first set pressure can also be 7.5MPa.
如果目标压力低于气体临界压力7.4MPa，需要开启所述两通电磁阀，使用增压泵将所述液体压力控制器中的压力调节至所述目标压力的第一预设数量倍，如90％，后关闭电磁阀，然后，利用所述液体压力控制器自带的调节系统将所述气体压力调节系统的当前输出压力调节至所述目标压力。如果升压幅度较大时，可以按照上述方式处理。可以理解的是升压幅度可以根据预先设定的幅度确定。If the target pressure is lower than the gas critical pressure of 7.4MPa, it is necessary to open the two-way solenoid valve, and use a booster pump to adjust the pressure in the liquid pressure controller to a first preset number of times the target pressure, such as 90 %, then close the solenoid valve, and then use the adjustment system of the liquid pressure controller to adjust the current output pressure of the gas pressure adjustment system to the target pressure. If the boost range is large, it can be handled in the above manner. It can be understood that the boosting amplitude can be determined according to a preset amplitude.
另外，如果仅是小幅度升压，当前输出压力已经在目标值的90％以内时，则不需要开启两通电磁阀，直接利用控制器调节至目标压力。在实际应用中，如果连续多次小幅升压，当最后一次开启电磁阀时的输出压力小于目标压力值的90％时，系统将开启所述两通电磁阀，使用增压泵将所述液体压力控制器内压力升至最新目标压力的90％，然后，利用所述液体压力控制器自带的调节系统将所述气体压力调节系统的当前输出压力调节至所述目标压力。In addition, if it is only a small boost, and the current output pressure is already within 90% of the target value, there is no need to open the two-way solenoid valve, and the controller is directly adjusted to the target pressure. In practical applications, if the pressure is continuously increased several times, when the output pressure when the solenoid valve is opened for the last time is less than 90% of the target pressure value, the system will open the two-way solenoid valve, and use the booster pump to pump the liquid The pressure in the pressure controller rises to 90% of the latest target pressure, and then, the current output pressure of the gas pressure regulation system is adjusted to the target pressure by using the regulation system of the liquid pressure controller.
如果需要连续小幅升压，比如从5.0MPa升到5.1MPa，5.1MPa升到5.2MPa；5.2MPa升到5.3MPa；判断最新的目标压力和最后一次开启两通电磁阀时压力的关系，再决定是否要打开两通电磁阀补充介质。If it is necessary to continuously increase the pressure slightly, for example, from 5.0MPa to 5.1MPa, 5.1MPa to 5.2MPa, and 5.2MPa to 5.3MPa; judge the relationship between the latest target pressure and the pressure when the two-way solenoid valve was opened for the last time, and then decide Whether to open the two-way solenoid valve to replenish the medium.
应用本发明图1所示实施例，在当前输出压力高于气体临界压力时，使用液体压力控制器将气体压力调节系统的当前输出压力调节至目标压力；在当前输出压力低于气体临界压力时，利用电磁阀以及增压泵将液体压力控制器中的压力调节至液体压力控制器的调节范围内，然后利用液体压力控制器将气体压力调节系统的当前输出压力调节至目标压力，因此，可以通过液体压力控制器进行气体的跨液化点调节。Applying the embodiment shown in FIG. 1 of the present invention, when the current output pressure is higher than the gas critical pressure, the liquid pressure controller is used to adjust the current output pressure of the gas pressure regulating system to the target pressure; when the current output pressure is lower than the gas critical pressure , use the solenoid valve and the booster pump to adjust the pressure in the liquid pressure controller to the adjustment range of the liquid pressure controller, and then use the liquid pressure controller to adjust the current output pressure of the gas pressure adjustment system to the target pressure. Therefore, you can Regulation of the gas across the liquefaction point by means of a liquid pressure controller.
另外，在本发明实施例中，由于液体压力控制器在自身的调节范围内的调节精度较高，在将当前输出压力调节至液体压力控制器的调节范围内后，可以实现气体在跨液化点调节过程中的高精度控制。In addition, in the embodiment of the present invention, since the adjustment accuracy of the liquid pressure controller within its own adjustment range is high, after the current output pressure is adjusted to the adjustment range of the liquid pressure controller, the gas can be realized across the liquefaction point. High precision control during adjustment.
在本发明实施例的一种具体实施方式中，在所述判断所述目标压力是否大于所述气体压力调节系统的当前输出压力的判断结果为否的情况下，所述方法还包括：In a specific implementation of the embodiment of the present invention, in the case that the judgment result of judging whether the target pressure is greater than the current output pressure of the gas pressure regulating system is NO, the method further includes:
S103(图中未示出)：在所述目标压力高于所述气体临界压力时，利用所述液体压力控制器将所述气体压力调节系统的当前输出压力调节至所述目标压力；在所述目标压力低于所述气体临界压力，且所述目标压力与第二预设数量之积高于所述气体临界压力时，开启所述三通电磁阀将所述液体压力控制器中的压力泄压至所述气体临界压力以下至第二设定压力，然后，利用所述液体压力控制器将所述气体压力调节系统的当前输出压力调节至所述目标压力；在所述目标压力低于所述气体临界压力，且所述目标压力与第二预设数量之积低于所述气体临界压力时，开启所述三通电磁阀，将所述液体压力控制器的压力降至所述目标压力与第二预设数量之积处，利用所述液体压力控制器将所述气体压力调节系统的当前输出压力调节至所述目标压力，其中，所述第二预设数量大于1，且第二预设数量与所述目标压力之积位于所述液体压力控制器的调压范围内。S103 (not shown in the figure): when the target pressure is higher than the gas critical pressure, use the liquid pressure controller to adjust the current output pressure of the gas pressure regulating system to the target pressure; When the target pressure is lower than the gas critical pressure, and the product of the target pressure and the second preset quantity is higher than the gas critical pressure, the three-way solenoid valve is opened to reduce the pressure in the liquid pressure controller. Relieve the pressure below the gas critical pressure to a second set pressure, and then use the liquid pressure controller to adjust the current output pressure of the gas pressure regulating system to the target pressure; when the target pressure is lower than When the gas critical pressure and the product of the target pressure and the second preset amount are lower than the gas critical pressure, the three-way solenoid valve is opened to reduce the pressure of the liquid pressure controller to the target At the product of the pressure and a second preset number, the liquid pressure controller is used to adjust the current output pressure of the gas pressure regulating system to the target pressure, wherein the second preset number is greater than 1, and the first The product of the two preset numbers and the target pressure is within the pressure regulation range of the liquid pressure controller.
降压过程(当前输出压力高于目标压力的情况下)：Decompression process (when the current output pressure is higher than the target pressure):
1、当目标压力大于7.4MPa时(比如从20MPa下降至15MPa，介质呈液体状态)，可直接用液体压力控制器来实现调节。1. When the target pressure is greater than 7.4MPa (for example, from 20MPa to 15MPa, the medium is in a liquid state), the liquid pressure controller can be directly used for adjustment.
2、当目标压力小于7.4MPa，且目标压力的第二预设数量倍小于气体临界压力时，先打开三通电磁阀泄掉部分二氧化碳以降低液压控制器内的压力至目标值的110％时关闭排气电磁阀，然后，启动压力控制器精确调节至目标压力。另外，如果仅是小幅度降压，即当前输出压力已经低于目标值的110％以下时，则不需要开启三通电磁阀，直接利用液压控制器调节至目标压力。如果连续多次小幅度降压时，当最后一次开启电磁阀时的输出压力大于最新目标压力的110％时，系统将开启所述三通电磁阀，使所述液体压力控制器内压力降至最新目标压力的110％后，利用所述液体压力控制器自带的调节系统将所述气体压力调节系统的当前输出压力调节至所述目标压力。2. When the target pressure is less than 7.4MPa, and the second preset number of times the target pressure is less than the gas critical pressure, first open the three-way solenoid valve to release part of the carbon dioxide to reduce the pressure in the hydraulic controller to 110% of the target value Close the exhaust solenoid valve, then activate the pressure controller to precisely adjust to the target pressure. In addition, if the pressure is only reduced by a small amount, that is, when the current output pressure is already lower than 110% of the target value, there is no need to open the three-way solenoid valve, and the hydraulic controller is directly used to adjust to the target pressure. If the pressure is reduced several times in a row, when the output pressure when the solenoid valve is opened for the last time is greater than 110% of the latest target pressure, the system will open the three-way solenoid valve, so that the pressure in the liquid pressure controller drops to 110%. After 110% of the latest target pressure, the current output pressure of the gas pressure regulation system is adjusted to the target pressure by using the regulation system of the liquid pressure controller.
当目标压力小于7.4MPa，且目标压力的第二预设数量倍大于气体临界压力时，先打开三通电磁阀泄掉部分二氧化碳以降低液体压力控制器内的压力至第二设定压力，如7.3MPa，然后，启动液体压力控制器来实现调节。When the target pressure is less than 7.4MPa, and the second preset number of the target pressure is greater than the gas critical pressure, first open the three-way solenoid valve to release part of the carbon dioxide to reduce the pressure in the liquid pressure controller to the second set pressure, such as 7.3MPa, and then start the liquid pressure controller to realize the adjustment.
需要强调的是，当目标压力低于临界压力7.4MPa，但目标压力的110％大于临界压力7.4MPa时，还可以先将压力控制器内的压力降至临界压力以下，如7.3MPa，当介质确定为气体后启动压力控制器精确调节至目标压力。由于，液体压力控制器运动范围有限，气体压缩比较大，如果不提前释放部分压力，可能运动到极限位置也降不到目标压力，因此，应用本发明实施例，可以进行跨液化点的压力精确调节。It should be emphasized that when the target pressure is lower than the critical pressure of 7.4MPa, but 110% of the target pressure is greater than the critical pressure of 7.4MPa, the pressure in the pressure controller can also be lowered to below the critical pressure, such as 7.3MPa, when the medium After confirming that it is gas, start the pressure controller to precisely adjust to the target pressure. Because the movement range of the liquid pressure controller is limited and the gas compression ratio is relatively large, if part of the pressure is not released in advance, it may move to the limit position and not drop the target pressure. Therefore, by applying the embodiment of the present invention, the pressure across the liquefaction point can be accurately measured adjust.
在本发明实施例的一种具体实施方式中，所述气源为二氧化碳气源。In a specific implementation of the embodiment of the present invention, the gas source is a carbon dioxide gas source.
超临界二氧化碳微乳液作为一种新兴绿色溶剂，具有无毒性、无腐蚀性、化学惰性等优点，在分离提纯、化学反应和纳米材料制备等领域有潜在应用前景。目前实验中合成超临界二氧化碳微乳液时，常用手动加压和单纯的电动增压泵进行加压，不仅费时费力，而且精度较低。As a new green solvent, supercritical carbon dioxide microemulsion has the advantages of non-toxicity, non-corrosiveness, chemical inertness, etc., and has potential application prospects in the fields of separation and purification, chemical reaction and nanomaterial preparation. At present, when synthesizing supercritical carbon dioxide microemulsion in experiments, manual pressurization and simple electric booster pump are often used for pressurization, which is not only time-consuming and labor-intensive, but also has low precision.
应用本发明实施例，可以实现对二氧化碳气体压力的大范围高精度调节。By applying the embodiments of the present invention, a wide range of high-precision adjustment of carbon dioxide gas pressure can be realized.
以上所述仅为本发明的较佳实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明的保护范围之内。The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the protection of the present invention. within the range.
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