Acid liquor flow constant adding device

Abstract

The utility model relates to the technical field of medium conveying, in particular to an acid liquor flow constant adding device which comprises a feeding valve, an acid tank and a pipeline main valve, and the feeding valve and the pipeline main valve are respectively connected with an inlet and an outlet of the acid tank through pipelines. The pipeline main valve is respectively connected with an electric diaphragm regulating valve and a manual valve through the pipelines, the electric diaphragm regulating valve is connected with the inlet end of an ultrasonic flowmeter, the manual valve is connected with the inlet end of an impeller flowmeter, and the impeller flowmeter is connected with the pipeline main valve. And the outlet end of the ultrasonic flowmeter and the outlet end of the impeller flowmeter are connected with a reaction tank through pipelines. Compared with a traditional method, according to the acid liquor flow constant adding device in the technical scheme, the acid liquor can be added into the reaction tank according to the constant flow through closed-loop flow adjustment and acidity automatic adjustment, the acidity of the tank liquor and the stability of the production process are kept, precision is high, and implementation is easy.

Description

Technical Field

[0001] The utility model relates to the technical field of medium transportation, in particular to an acid liquid flow rate constant adding device. Background Technique

[0002] During the corrosion production process, the acidity of the tank liquid in each reaction tank needs to be controlled within a certain range. The current method is that the operator titrates and tests the tank liquid, and manually adjusts the valve according to the test result to adjust the flow rate of the acid liquid added to the tank.

[0003] The above method is an open-loop control method. And due to certain errors that may exist in the test results, when the liquid delivery flow rate or the pressure in the liquid delivery pipeline is abnormal, it will cause the flow rate of the acid liquid added to the reaction tank to fluctuate, and further cause the acidity to be abnormal during the production process. Summary of the Invention

[0004] In order to overcome the above technical problems, the purpose of the utility model is to provide an acid liquid flow rate constant adding device, which solves the problem that the flow rate of the acid liquid added to the reaction tank is not stable enough during the corrosion production process.

[0005] The purpose of the utility model can be realized by the following technical solutions:

[0006] An acid liquid flow rate constant adding device includes a feed valve, an acid tank, and a pipeline main valve. The feed valve and the pipeline main valve are respectively connected to the inlet and outlet of the acid tank through pipelines;

[0007] The pipeline main valve is respectively connected with an electric diaphragm regulating valve and a manual valve through the pipeline. Among them, the inlet end of an ultrasonic flowmeter is connected to the electric diaphragm regulating valve, the inlet end of an impeller flowmeter is connected to the manual valve, and the outlet ends of the ultrasonic flowmeter and the impeller flowmeter are connected to a reaction tank through pipelines;

[0008] The reaction tank is connected with a sampling switch valve through a pipeline, and the sampling switch valve is connected with an acidity analyzer.

[0009] Furthermore, the pipeline is a CPVC pipeline.

[0010] Furthermore, the feed valve includes a first feed regulating valve and a second feed regulating valve.

[0011] Furthermore, the acid tank is made of stainless steel or polyethylene.

[0012] Furthermore, a liquid level sensor is installed inside the acid tank.

[0013] Furthermore, the electric diaphragm regulating valve can receive a 4-20 mA current signal to achieve flow regulation.

[0014] Furthermore, the sampling switch valve is located at the middle-lower position of the reaction tank.

[0015] Furthermore, the pH value range that the acidity analyzer can measure is between 0 and 14, and its measurement accuracy is 0.01 pH.

[0016] Advantages of the present utility model:

[0017] Compared with the traditional method, the acid liquid flow rate constant addition device in the present technical solution enables the acid liquid to be added to the reaction tank at a constant flow rate through closed-loop regulation of the flow rate and automatic regulation of the acidity, maintaining the stability of the bath acidity and the production process. It not only has high accuracy but also is easy to implement. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present utility model will be further described below in conjunction with the accompanying drawings.

[0019] Figure 1 is a structural schematic diagram of the present utility model;

[0020] Figure 2 is a system framework diagram of the acid liquid flow rate regulation in the present utility model;

[0021] Figure 3 is a process schematic diagram of the automatic regulation of the acid liquid concentration in the present utility model.

[0022] In the figure: 1, feed regulating valve one; 2, feed regulating valve two; 3, acid tank; 4, main pipeline valve; 5, electric diaphragm regulating valve; 6, ultrasonic flowmeter; 7, manual valve; 8, impeller flowmeter; 9, reaction tank; 10, sampling switch valve; 11, acidity analyzer; 12, pipeline. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0024] Appendix Figure 1 shows an overall structural view of the acid liquid flow rate constant addition device;

[0025] Figure 2 is a system framework diagram of the acid liquid flow rate regulation in the present utility model;

[0026] Figure 3 is a process schematic diagram of the automatic regulation of the acid liquid concentration in the present utility model.

[0027] As Figure 1 shown, an acid liquid flow rate constant addition device includes a feed valve, an acid tank 3, and a pipeline main valve 4. The feed valve and the pipeline main valve 4 are respectively connected to the inlet and outlet of the acid tank 3 through pipelines 12. The feed valve includes a feed regulating valve 1 and a feed regulating valve 2. The acid tank 3 has two inlets which are respectively connected to the feed regulating valve 1 and the feed regulating valve 2; the pipeline main valve 4 is used to control the connection and disconnection of the entire liquid delivery pipeline.

[0028] The pipeline main valve 4 is respectively connected with an electric diaphragm regulating valve 5 and a manual valve 7 through pipelines 12. The electric diaphragm regulating valve 5 has good linear fluid characteristics and is used as an automatic regulating actuator. The manual valve 7 is connected to an impeller flowmeter 8 and is used for manual flow regulation.

[0029] Among them, the inlet end of an ultrasonic flowmeter 6 is connected to the electric diaphragm regulating valve 5, and the inlet end of an impeller flowmeter 8 is connected to the manual valve 7. The outlet ends of the ultrasonic flowmeter 6 and the impeller flowmeter 8 are connected to a reaction tank 9 through pipelines 12; the reaction tank 9 is connected to a sampling switch valve 10 through pipelines 12, and the sampling switch valve 10 is connected to an acidity analyzer 11. The sampling switch valve 10 is used for automatically quantitatively sampling the tank liquid, and the acidity analyzer 11 is used for automatically titrating and analyzing the acidity of the acid liquid in the reaction tank 9.

[0030] Specifically, the ultrasonic flowmeter 6 here adopts a non-contact detection method, which is applicable to acidic fluids such as strong corrosiveness and high conductivity, to measure the instantaneous flow rate value in the pipeline 12 and is used as an input parameter for automatic regulation.

[0031] Specifically, the ends of the ultrasonic flowmeter 6 and the impeller flowmeter 8 are connected through pipelines 12. During automatic regulation, after the acid liquid is regulated by the electric diaphragm regulating valve 5 to reach the set flow rate, it is transported to the reaction tank 9 through pipelines 12. During manual regulation, the acid liquid passes through the manual valve 7 and the impeller flowmeter 8 and then is transported to the reaction tank 9 through pipelines 12.

[0032] As Figure 2 shown, this device can, according to different situations, achieve automatic closed-loop regulation of the acid liquid flow rate or manual open-loop regulation of the acid liquid flow rate, where:

[0033] Automatic closed-loop regulation of acid liquid flow: The outside of this constant acid liquid flow addition device is electrically connected with a touch screen. The touch screen is connected to the PLC through Ethernet communication. The operator can set the acid liquid flow value through the touch screen and close the manual valve 7 at the same time. The system converts the real-time flow data of the ultrasonic flowmeter 6 into an analog signal of 4 - 20 mA through the analog input module and inputs it to the PLC. The PLC first compares the received flow data with the set target value. When the difference between the real-time feedback acid liquid flow value and the target value is within the regulation dead zone, the current analog output remains unchanged at this time, that is, the electric diaphragm regulating valve 5 maintains the current valve opening; when the difference between the real-time feedback flow value and the target value is greater than the regulation dead zone, the PLC outputs a 4 - 20 mA analog signal to the electric diaphragm regulating valve 5 after PID operation. At this time, the valve actuator of the electric diaphragm regulating valve 5 acts according to the signal to adjust the valve opening size to complete the closed-loop regulation of the acid liquid flow.

[0034] Manual open-loop regulation of acid liquid flow: When the electric diaphragm regulating valve 5 fails and its valve opening is 0, manual regulation can be switched to at this time. The PLC reads the real-time flow value of the impeller flowmeter 8 through the analog input module and adjusts the manual valve 7 to provide temporary acid liquid addition.

[0035] As an example, the pipeline 12 is a CPVC pipeline. The CPVC pipeline is a new type of material pipeline obtained by chlorination modification of polyvinyl chloride resin. This modification has significantly improved the physical properties, chemical stability and processing performance of CPVC, and thus has excellent properties such as high strength, durability, high temperature resistance, corrosion resistance, insulation, flame retardancy, antibacterial and environmental protection.

[0036] As an example, the acid tank 3 is made of stainless steel or polyethylene to ensure the corrosion resistance of the acid tank 3 to the acid liquid. And a liquid level sensor is installed inside the acid tank 3 to monitor the acid liquid inventory in real time and avoid over - filling or under - filling.

[0037] As an example, in this embodiment, the electric diaphragm regulating valve 5 can accept a 4 - 20 mA current signal to achieve flow regulation.

[0038] Such as Figure 3As shown, the automatic adjustment of the acid solution concentration can be achieved through this device. The implementation method includes: the PLC regularly opens the sampling switch valve 10 according to the sampling volume set by the operator to sample the reaction tank 9, and automatically closes the sampling switch valve 10 after sampling. At this time, the acidity analyzer 11 detects the total acid and free acid acidity of the reaction tank 9. After the detection is completed, the detection results are fed back to the PLC through RS485 communication, and it is judged whether the acidity result is within the process control range. If it is within the normal parameter range, the acid solution flow rate is automatically adjusted in a closed loop to complete the constant flow addition; if the acidity is abnormal, that is, lower or higher than the normal parameter range, then at this time the PLC controls the actions of the feed regulating valve 1 and the feed regulating valve 2 according to the process recipe requirements, waits for the recipe to be completed and the reaction tank 9 to be stable, and then repeats the detection for judgment to complete the automatic acidity adjustment process.

[0039] Specifically, in this embodiment, the pH value range that the acidity analyzer 11 can measure is between 0 and 14, and its measurement accuracy is 0.01pH.

[0040] As an example, the sampling switch valve 10 is located at the middle and lower part of the reaction tank 9. This is because in the reaction tank 9 without a stirring device or with an obvious stirring effect, since gas and lighter liquid components tend to float to the upper part of the reaction tank 9, while heavier liquid components and solid particles may deposit at the bottom, the middle and lower part position can better balance the influence of these two parts, making the sampling result more representative. Therefore, the sampling switch valve 10 should be set at the middle and lower part of the reaction tank 9.

[0041] In the acid solution flow rate constant addition device in this solution, through the closed-loop adjustment of the flow rate and the automatic adjustment of the acidity, the acid solution can be added to the reaction tank 9 at a constant flow rate, maintaining the stability of the tank solution acidity and the production process. It not only has high accuracy but also is easy to implement.

[0042] In the description of this specification, the description with reference to terms such as "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0043] The above content is only an example and explanation of the present invention. Those skilled in the art of this technology make various modifications or supplements to the described specific embodiments or use similar methods to replace them. As long as they do not deviate from the invention or exceed the scope defined by this claim book, they should fall within the protection scope of the present invention.

Claims

1. An acid liquid flow rate constant addition device, characterized in that, It includes a feed valve, an acid tank and a pipeline main valve. The feed valve and the pipeline main valve are respectively connected to the inlet and outlet of the acid tank through pipelines. The pipeline main valve is respectively connected with an electric diaphragm regulating valve and a manual valve through the pipelines. Among them, the inlet end of an ultrasonic flowmeter is connected to the electric diaphragm regulating valve, and the inlet end of an impeller flowmeter is connected to the manual valve. The outlet ends of the ultrasonic flowmeter and the impeller flowmeter are connected to a reaction tank through pipelines. The reaction tank is connected with a sampling switch valve through a pipeline, and the sampling switch valve is connected with an acidity analyzer.

2. The constant acid liquid flow rate addition device according to claim 1, characterized in that The pipeline is a CPVC pipeline.

3. The acid liquid flow rate constant addition device according to claim 1, characterized in that, The feed valve includes a first feed regulating valve and a second feed regulating valve.

4. The acid liquid flow rate constant addition device according to claim 1, characterized in that The acid tank is made of stainless steel or polyethylene.

5. The acid liquid flow rate constant addition device according to claim 1, characterized in that A liquid level sensor is installed inside the acid tank.

6. The acid liquid flow rate constant addition device according to claim 1, characterized in that, The electric diaphragm regulating valve can accept a 4-20 mA current signal to achieve flow regulation.

7. The acid liquid flow rate constant addition device according to claim 1, characterized in that, The sampling switch valve is located at the middle and lower part of the reaction tank.

8. The constant acid solution flow rate addition device according to claim 1, characterized in that, The acidity analyzer can measure the pH value in the range of 0-14, and its measurement accuracy is 0.01 pH.

Images