Pretreatment device for online pH measurement of methanol
By using a combination of collection container, refrigeration parts, temperature sensing parts and on-off valves in the methanol online pH measurement device, the problem of inaccurate pH measurement at high temperature and high concentrations in coal-to-methanol production is solved, and a more stable temperature is achieved and flow rate control improves measurement accuracy.
Patent Information
- Application Number
- CN202420625046.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-28
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2034-03-28
AI Technical Summary
In coal-to-methanol production, the existing pH measurement is inaccurate at high temperature and high concentrations of 85% crude methanol, which is mainly due to the lack of temperature control and flow rate stability, resulting in large measurement errors and affecting production guidance.
A pretreatment device including a collection container, a refrigeration part, a temperature sensing part and an on-off valve is designed. The methanol solution is temporarily collected by the collection container, the refrigeration part cools down, the temperature sensing part monitors the temperature, and controls the on-off valve through the control unit. The stability of temperature and flow rate ensures the accuracy of pH meter measurement.
Through this device, the temperature cooling and flow rate stability of the methanol solution are achieved, the accuracy of pH measurement is improved, the measurement error is reduced, and the reference significance for production is enhanced.
Smart Images
Figure CN222166680U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of methanol pH determination, in particular to a pretreatment device for online methanol pH determination. Background Art
[0002] At present, in the production of coal-to-methanol, the crude methanol medium with a methanol content of 85% is mostly measured by online monitoring using a composite pH electrode. The electrode potential difference generated by the pH electrode is converted into a standard electrical signal for display and transmission through a secondary instrument after temperature compensation.
[0003] The main measuring parts of the pH meter include the glass electrode and the reference electrode. The glass electrode can respond to changes in the concentration of hydrogen ions in the solution, while the potential of the reference electrode is relatively stable. When the two electrodes are placed in the same solution, they form a galvanic cell. The potential change of the galvanic cell is only related to the potential change of the glass electrode, and the potential follows the Nernst law. The potential difference formed by the two electrodes is logarithmically related to the pH of the solution. By measuring the potential difference, the pH value of the solution can be calculated.
[0004] The glass electrode is an ion-selective electrode, that is, it is sensitive to H + Ions have a selective response and can form a membrane potential on the glass membrane. The temperature, pressure, flow rate, etc. of the measured liquid medium have a significant effect on H + The activity of ions has a certain influence on the H + The penetration and potential formation will affect the response of the glass membrane.
[0005] Therefore, in the existing coal-to-methanol process, the temperature of 85% crude methanol is 76°C and the pressure is 0.5Mpa. It is difficult to measure the pH value relatively accurately under such conditions. In addition, only an ordinary flow cell is designed for pH value measurement under such working conditions in the market. Figure 2 As shown in the figure, when crude methanol passes through the flow cell, the temperature is high and the flow rate is large, which leads to large fluctuations in the measured values and large errors, and has little reference significance for guiding production. In summary, the traditional flow cell structure has two defects: 1. The temperature of the methanol solution is not controlled, resulting in excessively high temperature; 2. The flow rate of the methanol solution is not controlled, which has a great impact on the stability of the instrument measurement. Utility Model Content
[0006] In view of the above problems, the present application provides a pretreatment device for online pH measurement of methanol, which solves the problem of inaccurate online pH measurement of high-temperature and high-concentration methanol in the prior art.
[0007] To achieve the purpose of this application, this application provides the following technical solutions:
[0008] The utility model provides a pretreatment device for online pH determination of methanol, comprising:
[0009] A collecting container having a liquid inlet and a liquid outlet, wherein the collecting container is used to collect the online methanol solution;
[0010] Refrigeration components, used to cool the methanol solution;
[0011] Temperature sensing element, used to monitor the temperature of the methanol solution;
[0012] an on-off valve, connected to the liquid inlet and the liquid outlet, respectively, for on-off control of the inflow and outflow of the methanol solution;
[0013] The control unit is electrically connected to the refrigeration component, the temperature sensing component and the on-off valve respectively.
[0014] According to the pretreatment device provided by the utility model, the collection container is made of metal.
[0015] According to the pretreatment device provided by the utility model, the refrigeration component is arranged in the collection container.
[0016] According to the pretreatment device provided by the utility model, the temperature sensing component is arranged in the collection container.
[0017] According to the pretreatment device provided by the utility model, the refrigeration element is a semiconductor refrigeration sheet.
[0018] According to the pretreatment device provided by the utility model, the temperature sensing component is a temperature sensor.
[0019] According to the pretreatment device provided by the utility model, the on-off valve is an electrically controlled four-way valve.
[0020] According to the pretreatment device provided by the utility model, the collection container is a buffer tank.
[0021] According to the pretreatment device provided by the utility model, the semiconductor refrigeration sheet is attached to the outer side wall of the collection container.
[0022] The utility model provides a pretreatment device for online pH measurement of methanol. By setting a collecting container, the online methanol solution can be temporarily collected and placed in a static state, thereby stabilizing the flow rate of the methanol solution and achieving accurate measurement. By setting a refrigeration component, the methanol solution can be cooled to further accurately achieve the measurement value of the pH meter. By setting a temperature sensing component, the temperature of the methanol solution can be monitored in real time and fed back to the control unit. By setting an on-off valve, the methanol solution on the production line can be controlled to enter and flow out of the methanol solution, thereby achieving temporary storage in the methanol solution. By setting a control unit, the temperature signal can be collected, and the start and stop of the refrigeration component and the switch of the on-off valve can be controlled.
[0023] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] The accompanying drawings are used to provide a further understanding of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation on the present application.
[0025] Figure 1 A schematic diagram of the structure of a pre-processing device provided in an embodiment of the present application;
[0026] Figure 2 It is a schematic diagram of the structure of a methanol solution pH monitoring device in the prior art.
[0027] Reference numerals:
[0028] 1. Collection container; 101. Liquid inlet; 102. Liquid outlet;
[0029] 2. Refrigeration parts;
[0030] 3. Temperature sensing parts;
[0031] 4. On-off valve;
[0032] 5. Control unit;
[0033] 6. pH meter;
[0034] 7. Circulation pool; 701. Liquid inlet end; 702. Liquid outlet end. DETAILED DESCRIPTION
[0035] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with the drawings in this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
[0036] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features; in the description of this application, unless otherwise specified, "plurality" means two or more.
[0037] First, the existing technology is introduced:
[0038] In the existing coal-to-methanol process, the temperature of 85% crude methanol is 76°C and the pressure is 0.5Mpa. It is difficult to measure the pH value relatively accurately under such conditions. In addition, only an ordinary flow cell is designed for pH value measurement under such working conditions in the market. Figure 2 As shown, it is mainly composed of a circulation pool 7, a liquid inlet end 701 and a liquid outlet end 702;
[0039] When crude methanol passes through the flow cell, the temperature is high and the flow rate is large, which leads to large fluctuations in the measured values and large errors, and has little reference value for guiding production. In summary, the traditional flow cell structure has two defects: 1. The temperature of the methanol solution is not controlled, resulting in excessively high temperature; 2. The flow rate of the methanol solution is not controlled, which has a great impact on the stability of the instrument measurement.
[0040] In order to solve the above technical problems, the utility model proposes the following technical solutions and corresponding embodiments.
[0041] Combine the following Figure 1 The embodiment shown describes the technical solution of the utility model: wherein, Figure 1 As shown:
[0042] The embodiment of the utility model provides a pretreatment device for online pH determination of methanol, comprising: a collecting container 1, a refrigeration component 2, a temperature sensing component 3, an on-off valve 4 and a control unit 5, wherein the collecting container 1 has a liquid inlet 101 and a liquid outlet 102, and the collecting container 1 is used to collect online methanol solution; the refrigeration component 2 is used to cool the methanol solution; the temperature sensing component 3 is used to monitor the temperature of the methanol solution; the on-off valve 4 is respectively connected to the liquid inlet 101 and the liquid outlet 102, and is used to perform on-off control on the entry and outflow of the methanol solution; the control unit 5 is respectively electrically connected to the refrigeration component 2, the temperature sensing component 3 and the on-off valve 4.
[0043] In some embodiments, the collecting container 1 can be a square box body, a cylindrical box body, or a liquid storage tank, that is, as long as it can store methanol solutions below 100°C and does not react with methanol solutions; the refrigeration component 2 can be a semiconductor refrigeration plate or an evaporative refrigeration component, as long as it can lower the temperature of methanol; the on-off valve 4 can be two solenoid valves, which are respectively installed on the liquid inlet pipeline and the liquid outlet pipeline, or it can be a four-way valve, which realizes the on-off of two passages by rotation; the control unit 5 can be a PLC control system or a single-chip microcomputer control module, as long as it can receive temperature signals and control the refrigeration component 2 and the on-off valve 4.
[0044] The embodiment of the utility model provides a pretreatment device for online pH determination of methanol. Through the setting of the collecting container 1, the online methanol solution can be temporarily collected and placed in a static state, thereby stabilizing the flow rate of the methanol solution and achieving accurate measurement; through the setting of the refrigeration component 2, the methanol solution can be cooled, thereby further accurately achieving the measurement value of the pH meter 6; through the setting of the temperature sensing component 3, the temperature of the methanol solution can be monitored in real time and fed back to the control unit 5; through the setting of the on-off valve 4, the methanol solution on the production line can be controlled to enter and flow out of the methanol solution, thereby achieving temporary storage in the methanol solution; through the setting of the control unit 5, the temperature signal can be collected, and the start and stop of the refrigeration component 2 and the switch of the on-off valve 4 can be controlled.
[0045] According to the pre-processing device provided by the embodiment of the utility model, Figure 1 As shown, the collecting container 1 is made of metal.
[0046] In some embodiments, the collection container 1 is made of metal material, such as copper, stainless steel or nickel-chromium alloy. This design is conducive to heat exchange of the high-temperature methanol solution in the collection container 1, can dissipate the internal heat to the outside as quickly as possible, and is also conducive to heat conduction of the refrigeration component 2.
[0047] According to the pre-processing device provided by the embodiment of the utility model, Figure 1 As shown, the refrigeration element 2 is arranged in the collection container 1.
[0048] In some embodiments, the refrigeration component 2 is arranged on the collection container 1, which is convenient for the installation of the refrigeration component 2. If the collection container 1 is made of metal, the refrigeration component 2 can be directly installed on the collection container 1, avoiding direct contact with the methanol solution, and achieving good heat conduction effect. This is convenient for the repair and maintenance of the refrigeration component 2, and avoids long-term immersion and corrosion of the refrigeration component 2 by the methanol solution.
[0049] According to the pre-processing device provided by the embodiment of the utility model, Figure 1As shown, the temperature sensing element 3 is arranged in the collecting container 1 .
[0050] In some embodiments, the temperature sensing component 3 is arranged on the collecting container 1, which is conducive to the installation of the temperature sensing component 3. Under the premise that the collecting container 1 is made of metal, the temperature sensing component 3 can be directly installed on the collecting container 1, avoiding direct contact with the methanol solution. At the same time, it can also achieve a good heat conduction effect. The temperature measurement value is more accurate, which is conducive to the repair and maintenance of the temperature sensing component 3 and avoids long-term immersion and corrosion of the temperature sensing component 3 by the methanol solution.
[0051] According to the pre-processing device provided by the embodiment of the utility model, Figure 1 As shown, the refrigeration element 2 is a semiconductor refrigeration sheet.
[0052] In some embodiments, the refrigeration component 2 can be a semiconductor refrigeration plate, an evaporative refrigeration component, or a circulating water-cooled heat exchange system; in the present embodiment, a semiconductor refrigeration plate is preferred, which has the advantages of low cost, small size, easy installation and replacement, etc., and can meet the cooling requirements of methanol with a temperature of 76°C on the production line, and can cool it down to about 40°C.
[0053] According to the pre-processing device provided by the embodiment of the utility model, Figure 1 As shown, the temperature sensing element 3 is a temperature sensor.
[0054] In some embodiments, the temperature sensor may be a thermistor type, a thermocouple type, an RTD (resistance temperature detector), a digital thermometer IC, or the like.
[0055] According to the pre-processing device provided by the embodiment of the utility model, Figure 1 As shown, the on-off valve 4 is an electrically controlled four-way valve.
[0056] In some embodiments, the electrically controlled four-way valve can be opened and closed under the action of the control unit 5. When it is in the power-off state, the methanol solution on the production line passes through the electrically controlled four-way valve for external circulation; when it is in the power-on state, the external circulation is closed and the internal circulation connected to the inner cavity of the collection container 1 is opened. In this way, the methanol solution on the production line can be drained into the collection container 1, and the external circulation continues to be opened, the internal circulation is closed, and the temperature is lowered and the pH value is tested at the same time.
[0057] According to the pre-processing device provided by the embodiment of the utility model, Figure 1 As shown, the collecting container 1 is a buffer tank, and the semiconductor cooling sheet is attached to the outer wall of the collecting container 1.
[0058] In some embodiments, the collection container 1 is designed as a buffer tank, which is beneficial for real-time sampling of the solution, and the semiconductor cooling sheet is attached to the outer wall of the collection container 1 to facilitate installation and replacement.
[0059] The above embodiments are only used to illustrate the technical solution of the present application, but not to limit it. The present application is not limited to the exact structure described above and illustrated in the accompanying drawings, and it cannot be determined that the specific implementation of the present application is limited to these descriptions. For ordinary technicians in the technical field to which the present application belongs, various changes and modifications made without departing from the concept of the present application should be deemed to belong to the protection scope of the present application.
Claims
1. A pretreatment device for online pH determination of methanol, characterized in that: include: A collecting container having a liquid inlet and a liquid outlet, wherein the collecting container is used to collect the online methanol solution; Refrigeration components, used to cool the methanol solution; Temperature sensing element, used to monitor the temperature of the methanol solution; an on-off valve, connected to the liquid inlet and the liquid outlet, respectively, for on-off control of the inflow and outflow of the methanol solution; The control unit is electrically connected to the refrigeration component, the temperature sensing component and the on-off valve respectively.
2. The pretreatment device according to claim 1, characterized in that: The collecting container is made of metal.
3. The pretreatment device according to claim 2, characterized in that: The refrigeration component is arranged in the collection container.
4. The pretreatment device according to claim 2, characterized in that: The temperature sensing element is arranged on the collection container.
5. The pretreatment device according to claim 2, characterized in that: The refrigeration element is a semiconductor refrigeration sheet.
6. The pretreatment device according to claim 1, characterized in that: The temperature sensing element is a temperature sensor.
7. The pretreatment device according to claim 1, characterized in that: The on-off valve is an electrically controlled four-way valve.
8. The pretreatment device according to claim 2, characterized in that: The collection container is a buffer tank.
9. The pretreatment device according to claim 5, characterized in that: The semiconductor refrigeration sheet is attached to the outer side wall of the collection container.