Value setting device for concentration of ultrahigh-concentration ethanol

Abstract

The utility model discloses a constant value device for the concentration of ultrahigh-concentration ethanol. The constant value device comprises an ethanol generating source, a secondary diluting device connected with the ethanol generating source, an ethanol gas analyzer with a first gas input port connected with the secondary diluting device, and a gas pumping structure communicated with a second gas input port of the ethanol gas analyzer. According to the ultrahigh-concentration ethanol concentration valuing device, the dilution difficulty of high-purity ethanol gas is effectively reduced, the influence caused by physical adsorption or chemical reaction is reduced, the high-purity ethanol gas can be more accurately diluted, meanwhile, the dosage of dilution gas is greatly reduced, and the dilution efficiency is improved. And the development and progress of the industry are effectively promoted.

Description

Technical Field

[0001] This application relates to the field of ethanol concentration determination, and more specifically to a device for determining the concentration of ultra-high concentration ethanol. Background Technology

[0002] With the continuous transformation and upgrading of my country's liquor industry, more and more liquor production lines, especially automated production lines, are installing ethanol alarms to monitor the leakage of flammable and explosive ethanol during production. To calibrate these alarms, ethanol generators based on the dynamic saturation method have been developed. These generators vaporize liquid ethanol into gaseous ethanol by accurately controlling parameters such as temperature, pressure, and flow rate, thus obtaining the high-concentration ethanol gas needed for alarm calibration. However, these ethanol generators cannot accurately provide the concentration of the generated ethanol gas because their measurement principle assumes that the generator produces saturated ethanol vapor. The volume fraction of ethanol in the generator is obtained by the ratio of the saturated vapor pressure of ethanol at the current temperature to the total pressure of the gas inside the generator (Dalton's law of partial pressures). However, this principle is only an ideal state, because saturation is a dynamic equilibrium; ethanol is constantly in a dynamic transition state between liquefaction and volatilization, making it very unstable. Therefore, the ethanol gas produced by existing ethanol generators is generally below complete saturation, but the degree of saturation cannot be accurately measured. Thus, the concentration of ultra-high concentration ethanol gas produced by these generators cannot be accurately determined, and the traceability chain for measurement still has significant deficiencies.

[0003] Existing dilution devices such as Figure 1 As shown, it controls two flow rates separately through a dual-channel mass flow controller (MFC, usually a thermal mass flow controller), and the resulting mixture yields the target low-concentration gas. Assuming the high-concentration gas concentration is x, its flow rate is q, and the dilution gas (usually nitrogen or air) flow rate is Q, the low-concentration gas concentration x1 is calculated according to equation (1), and q / Q is the dilution ratio a of the conventional dilution method:

[0004] According to the working principle of thermal mass flow controllers (MFC) (GB / T 5275.7), their response value is related to the specific heat capacity of the gas medium. Different gas media exhibit different response coefficients due to their varying specific heat capacities. Existing flow measurement standards typically use nitrogen or air as the medium. Directly using MFC to measure other gases will introduce certain deviations, especially in the high-concentration ethanol-air mixture involved in this invention. Due to the extremely high ethanol concentration, the response deviation caused by the difference in the ethanol gas medium is significant and cannot be ignored. Therefore, the accuracy of the flow rate q in the above formula is very low, resulting in an inaccurate dilution ratio a, and consequently, an inaccurate final diluted concentration. Furthermore, ethanol molecules are relatively reactive and easily undergo physical adsorption or chemical reactions with conventional gas path materials (such as stainless steel and rubber), causing a loss of component concentration x. Moreover, gas path structures, such as valves, seals, and connectors, all have a certain dead volume, which also contributes to the loss of component concentration x. All of these factors will cause the final diluted concentration to deviate from the expected concentration. Moreover, when dilution is performed using the aforementioned device, a large amount of dilution gas is required when the dilution ratio is large, which may even cause the amount of dilution gas used to far exceed the conventional gas supply capacity. Utility Model Content

[0005] To address the shortcomings of existing technologies, this application provides a device for determining the concentration of ultra-high concentration ethanol, which effectively reduces the difficulty of diluting high-purity ethanol gas, reduces the impact of physical adsorption or chemical reactions, enables more accurate dilution of high-purity ethanol gas, and greatly reduces the amount of dilution gas used, effectively promoting the development and progress of the industry.

[0006] A device for determining the concentration of ultra-high concentration ethanol includes an ethanol generation source, a secondary dilution device connected to the ethanol generation source, an ethanol gas analyzer with a first gas inlet connected to the secondary dilution device, and a gas pumping structure connected to a second gas inlet of the ethanol gas analyzer.

[0007] Furthermore, the secondary dilution device consists of a primary dilution section and a secondary dilution section connected to the primary dilution section.

[0008] Furthermore, the primary dilution unit consists of a dry piston flow calibrator, a No. 1 three-way valve whose inlet is connected to the ethanol generation source and whose first output port is connected to the dry piston flow calibrator, a needle valve and a No. 2 three-way valve whose inlet is connected to the second output port of the No. 1 three-way valve, a No. 1 flow meter whose inlet is connected to the output port of the needle valve and whose output port serves as the venting port of the No. 1 gas path, and a No. 2 flow meter whose inlet is connected to the first output port of the No. 2 three-way valve and whose output port serves as the venting port of the No. 2 gas path.

[0009] Furthermore, the secondary dilution section consists of a dilution gas discharge device and a flow controller whose input port is connected to the dilution gas discharge device and whose output port serves as the fourth gas path; the second output port of the second three-way valve serves as the third gas path, and the third and fourth gas paths are simultaneously connected to the same mixing gas pipeline that is connected to the first gas input port of the ethanol gas analyzer.

[0010] In addition, the gas pumping structure consists of a certified gas standard substance introduction component and an ethanol-containing air pumping component; only one of the certified gas standard substance introduction component and the ethanol-containing air pumping component is connected to the second gas input port of the ethanol gas analyzer at any given time.

[0011] Compared with the prior art, the embodiments of this application have the following beneficial effects:

[0012] This invention effectively reduces the difficulty of diluting high-purity ethanol gas, reduces the impact of physical adsorption or chemical reactions, enables more accurate dilution of high-purity ethanol gas, and greatly reduces the amount of dilution gas used, effectively promoting the development and progress of the industry.

[0013] Some of the additional features of this application will be described in the following description. These additional features will become apparent to those skilled in the art upon examination of the following description and the accompanying drawings, or upon understanding the production or operation of the embodiments. The features disclosed in this application can be implemented and achieved through the practice or use of various methods, means, and combinations thereof with respect to the specific embodiments described below. Attached Figure Description

[0014] The accompanying drawings, which are provided to further illustrate this application and constitute a part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute a limitation thereof. In the drawings, the same reference numerals denote the same components.

[0015] Figure 1 This refers to the existing dilution device structure.

[0016] Figure 2 This is a structural block diagram of the present invention.

[0017] Figure 3 This is a structural block diagram of the secondary dilution device of this utility model.

[0018] Explanation of reference numerals in the attached diagram: 100, Ethanol generator; 200, Secondary dilution device; 201, Dry piston flow calibrator; 202, Flow meter No. 1; 203, Flow meter No. 2; 204, Flow controller; 205, Dilution gas discharge device; 211, Three-way valve No. 1; 212, Needle valve; 213, Three-way valve No. 2; 221, Gas path No. 1; 222, Gas path No. 2; 223, Gas path No. 3; 224, Gas path No. 4; 300, Ethanol gas analyzer; 400, Certified gas standard substance introduction assembly; 500, Ethanol-containing air pumping assembly. Detailed Implementation

[0019] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings 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 in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0020] It should be noted that if the terms "first," "second," etc., are used in the specification, claims, and accompanying drawings of this application, they are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0021] In this application, when terms such as "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" are used, they indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are mainly for better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0022] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0023] Furthermore, in this application, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] Example 1

[0026] like Figure 2 As shown, a device for setting the concentration of ultra-high concentration ethanol includes an ethanol generation source 100, a secondary dilution device 200 connected to the ethanol generation source 100, an ethanol gas analyzer 300 with a first gas inlet connected to the secondary dilution device 200, and a gas pumping structure connected to the second gas inlet of the ethanol gas analyzer 300.

[0027] like Figure 3 As shown, the secondary dilution device 200 consists of a primary dilution section and a secondary dilution section connected to the primary dilution section.

[0028] The primary dilution unit consists of a dry piston flow calibrator 201, a first three-way valve 211 whose input port is connected to the ethanol generator 100 and whose first output port is connected to the dry piston flow calibrator 201, a needle valve 212 and a second three-way valve 213 whose input port is connected to the second output port of the first three-way valve 211, a first flow meter 202 whose input port is connected to the output port of the needle valve 212 and whose output port serves as the first gas path 221 for venting, and a second flow meter 203 whose input port is connected to the first output port of the second three-way valve 213 and whose output port serves as the second gas path 222 for venting.

[0029] It should be noted that the ethanol gas discharged during the purging of gas lines one and two should not be discharged into the room. The preferred solution is to discharge the ethanol gas into a recovery device. This method is existing technology, and those skilled in the art can complete the purging of ethanol gas without creative effort, so it will not be elaborated here.

[0030] The secondary dilution section consists of a dilution gas discharge device 205 and a flow controller 204 whose inlet is connected to the dilution gas discharge device 205 and whose outlet serves as the fourth gas path 224. The second outlet of the second three-way valve 213 serves as the third gas path 223. The third gas path 223 and the fourth gas path 224 are simultaneously connected to the same mixing gas pipeline that is connected to the first gas inlet of the ethanol gas analyzer 300.

[0031] The gas pumping structure consists of a certified gas standard substance introduction component 400 and an ethanol-containing air pumping component 500; only one of the certified gas standard substance introduction component 400 and the ethanol-containing air pumping component 500 is connected to the second gas input port of the ethanol gas analyzer 300 at any given time.

[0032] High-concentration ethanol gas generated by ethanol sources cannot be directly and accurately measured because there is no corresponding metrological standard for this concentration range (3000–18000) μmol / mol, making it impossible to calibrate the analyzer's measurement results. Therefore, the concentration must be accurately diluted to a range where an ethanol concentration metrological standard exists. The core of this invention is... Figure 3 The secondary dilution device in the instrument can dilute the high-concentration ethanol gas of concentration x generated by the ethanol source to a concentration of x / a at a certain dilution ratio a (which can be set according to actual needs). The concentration of ethanol gas of concentration x / a can reach the concentration range of the existing certified gas standard material for ethanol in the air, that is, (0~500) μmol / mol. The gas analyzer can be calibrated by the certified gas standard material within this range. Therefore, the calibrated gas analyzer can accurately measure the value of concentration x / a.

[0033] The specific working process and principles are as follows:

[0034] 1. Ethanol generation source produces high-concentration ethanol gas.

[0035] 2. Adjust the No. 1 three-way valve so that it switches to the first output port. The high-concentration ethanol gas enters the dry piston flow calibrator through the No. 1 three-way valve to measure the ethanol gas flow rate. This instrument is based on the volume tube principle and is different from the thermal mass flow controller. It is not affected by the type of molecule and records the flow rate Q of the high-concentration ethanol gas generated by the ethanol source.

[0036] 3. Switch the No. 1 three-way valve to the second output port, and simultaneously switch the No. 2 three-way valve to the first output port. This allows the high-concentration ethanol gas to be discharged through both the No. 1 and No. 2 gas paths. The two high-concentration ethanol gas paths pass through the No. 1 and No. 2 flow meters, respectively. The reading of the No. 1 flow meter is q1, and the reading of the No. 2 flow meter is q2. Adjust q1 and q2 by adjusting the needle valve using the formula... Calculate the dilution ratio a1;

[0037] The dilution ratio a1 is determined based on the target dilution ratio and can typically be between 0.1 and 0.5.

[0038] The purpose of this step is to initially determine the dilution ratio a1. Although the flow meter is affected by the response factor, both gas lines one and two use the same gas and have the same response factor, so the dilution ratio a1 is unaffected and an accurate value can be obtained. By following these steps, the approximate dilution ratio can be quickly determined, saving time.

[0039] 4. Switch the No. 2 three-way valve to the second output port, thereby opening the No. 3 gas path, and record the reading of the No. 1 flow meter at this time. The change in the gas path structure may cause a change in the reading of flow meter No. 1, but the total inlet flow rate will remain unchanged. Therefore, the dilution ratio is calculated according to the formula... The flow rate q3 of gas path 3 is calculated using the formula q3=Q×q1.

[0040] The purpose of switching the split gas to gas path number three is that gas path number three has a simple structure with only a two-way valve. However, gas path number two has a flow meter, which has a great influence on the adsorption of ethanol active components. Switching to gas path number three will significantly reduce the loss of ethanol components and improve the accuracy of the final dilution concentration.

[0041] 5. Adjust the flow controller of gas line 4 to make the dilution gas flow rate reach q4, and then use the formula... Calculate the dilution ratio 'a' of the output secondary dilution device.

[0042] 6. Ethanol gas with a concentration of x / a and ethanol gas of a standard concentration introduced by the certified gas standard substance introduction component are simultaneously introduced into the ethanol gas analyzer. This allows us to obtain the specific concentration of x / a, and also to deduce the specific value of the concentration x of the high-concentration ethanol gas.

[0043] 7. Adjust the flow controller according to the requirements to obtain ethanol gas of a certain concentration. Disconnect the certified gas standard substance introduction component from the ethanol gas analyzer, and at the same time connect the ethanol-containing air pumping component to the ethanol gas analyzer. Finally, the ethanol concentration of the ethanol gas can be compared with the pumped ethanol-containing air to determine whether the ethanol in the air exceeds the standard.

[0044] The two-stage dilution device of this application adopts a method of first diverting and then diluting, which can effectively control the amount of dilution gas used, so that the amount of dilution gas used can be controlled within the gas supply capacity, thus ensuring the accuracy of detection.

[0045] Furthermore, the product of this application is also applicable to various special gases. This application takes into account the influence of response factors of different gas media, and in terms of structure, it tries to avoid flow deviation caused by response factors. At the same time, the gas path design has also been specially considered to minimize the loss of components caused by the gas path structure.

[0046] It should be noted that all features disclosed in this specification, or all steps in all methods or processes disclosed, may be combined in any way, except for mutually exclusive features and / or steps.

[0047] Furthermore, the specific embodiments described above are exemplary. Those skilled in the art can devise various solutions inspired by the disclosure of this utility model, and these solutions all fall within the scope of this utility model and its protection. Those skilled in the art should understand that this utility model specification and its drawings are illustrative and not intended to limit the scope of the claims. The scope of protection of this utility model is defined by the claims and their equivalents.

Claims

1. A device for determining the concentration of ultra-high concentration ethanol, characterized in that, It includes an ethanol generator (100), a secondary dilution device (200) connected to the ethanol generator (100), an ethanol gas analyzer (300) with a first gas inlet connected to the secondary dilution device (200), and a gas pumping structure connected to the second gas inlet of the ethanol gas analyzer (300).

2. The device for determining the concentration of ultra-high concentration ethanol according to claim 1, characterized in that, The secondary dilution device (200) consists of a primary dilution section and a secondary dilution section connected to the primary dilution section.

3. The device for determining the concentration of ultra-high concentration ethanol according to claim 2, characterized in that, The primary dilution unit consists of a dry piston flow calibrator (201), a first three-way valve (211) whose inlet is connected to the ethanol generator (100) and whose first output is connected to the dry piston flow calibrator (201), a needle valve (212) whose inlet is connected to the second output of the first three-way valve (211) and a second three-way valve (213), a first flow meter (202) whose inlet is connected to the output of the needle valve (212) and whose output serves as the outlet of the first gas path (221), and a second flow meter (203) whose inlet is connected to the first output of the second three-way valve (213) and whose output serves as the outlet of the second gas path (222).

4. The device for determining the concentration of ultra-high concentration ethanol according to claim 3, characterized in that, The secondary dilution section consists of a dilution gas discharge device (205) and a flow controller (204) whose inlet is connected to the dilution gas discharge device (205) and whose outlet serves as the fourth gas path (224). The second outlet of the second three-way valve (213) serves as the third gas path (223). The third gas path (223) and the fourth gas path (224) are simultaneously connected to the same mixing gas pipeline that is connected to the first gas inlet of the ethanol gas analyzer (300).

5. The device for determining the concentration of ultra-high concentration ethanol according to claim 4, characterized in that, The gas pumping structure consists of a certified gas standard substance introduction component (400) and an ethanol-containing air pumping component (500); only one of the certified gas standard substance introduction component (400) and the ethanol-containing air pumping component (500) is connected to the second gas input port of the ethanol gas analyzer (300) at any given time.

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