PH meter measuring device for tail gas emission control

Abstract

The utility model discloses a PH meter measuring device for tail gas emission control, which comprises a detection branch pipe, one end of the detection branch pipe is communicated and connected with a circulating pipe, the other end of the detection branch pipe is communicated and connected with a tail gas absorption tower, and the heights of the two ends of the detection branch pipe are different; the device further comprises a solution bin, the solution bin comprises a detection bin and a cleaning bin, the detection bin is arranged on the detection branch pipe in a communicated mode, and the cleaning bin is fixedly arranged on the side edge of the detection bin. A PH meter probe is arranged at the position of the solution bin, the PH meter probe is installed on a support, and the support is connected with the solution bin and controls the PH meter probe to move; according to the utility model, the detection branch pipe is arranged, the higher end of the detection branch pipe is communicated and connected with the circulating pipe, and the lower end of the detection branch pipe is communicated and connected with the tail gas absorption tower, so that the detection branch pipe can be communicated and connected with the circulating pipe, liquid can conveniently flow back to the tail gas absorption tower, and waste of the liquid is avoided.

Description

Technical Field

[0001] This utility model relates to the field of pH detection technology for exhaust gas absorption towers, specifically a pH meter measuring device for exhaust gas emission control. Background Technology

[0002] The main function of exhaust gas absorption towers is to treat exhaust gases emitted during industrial production or other processes. Through absorption and other operations, harmful substances in the exhaust gases are removed to achieve the purposes of purifying exhaust gases, protecting the environment, and recovering valuable substances.

[0003] pH meters are widely used in the detection and monitoring of pH values ​​in tail gas absorption towers to ensure that acidic tail gas reaches a neutral to alkaline state after absorption by alkaline washing solution / absorption liquid, before being sent to RTO for incineration to meet emission standards. In actual operation, due to the varying flow rates and contents of tail gas in different production stages, it is difficult to determine the saturation level of the alkaline washing solution, which can easily lead to tail gas being incinerated and discharged without sufficient treatment, failing to meet environmental protection requirements.

[0004] In existing designs, pH meters for detecting alkaline washing solutions are typically mounted directly on the reactor vessel using a threaded fastener. This means the pH meter needs to be in prolonged contact with the liquid. The sensing element at the tip of the pH meter, which contacts the liquid, is an electrode ball, suitable for systems with pH values ​​of 2-12. Prolonged contact with strong acid or alkaline solutions in the reactor vessel severely impacts the lifespan of the pH meter. For example, with the current design, the pH meter will fail within 7-15 days, requiring disassembly, repair, or replacement. This inevitably affects the acid-base detection of the liquid. Furthermore, the electrode element is expensive; frequent replacements significantly increase production and labor costs for the company.

[0005] In summary, the existing design method is difficult to accurately determine the saturation level of the absorbent, and is prone to pH meter malfunction, increasing maintenance costs and making it unsuitable for long-term use.

[0006] Therefore, there is an urgent need for a method and device that can accurately determine the saturation level of alkaline washing solution absorption, extend the service life of pH meters, and reduce maintenance costs. Utility Model Content

[0007] The purpose of this invention is to provide a pH meter measuring device for exhaust gas emission control, which aims to improve the problems of pH meters used in exhaust gas absorption towers being easily damaged, not conducive to long-term use, and having high maintenance costs.

[0008] This invention is implemented as follows: A pH meter measuring device for exhaust emission control includes a detection branch pipe, one end of which is connected to a circulation pipe, and the other end of which is connected to an exhaust gas absorption tower. The two ends of the detection branch pipe are at different heights. It also includes a solution chamber, which comprises a detection chamber and a cleaning chamber. The detection chamber is connected to the detection branch pipe, and the cleaning chamber is fixedly located on the side of the detection chamber. A pH meter probe is installed in the solution chamber, mounted on a bracket connected to the solution chamber, which controls the movement of the pH meter probe.

[0009] As one embodiment of this utility model, the two ends of the circulation pipe are respectively connected and set at different positions of the tail gas absorption tower, and a circulation pump, control valve and instrument are connected on the circulation pipe.

[0010] As one embodiment of this utility model, the detection branch pipe includes a vertical pipe and two horizontal pipes that are respectively connected to each other at the upper and lower ends of the vertical pipe. A first solenoid valve and a second solenoid valve are respectively connected to each other on the two horizontal pipes of the detection branch pipe, and a connection port is provided at the top of the detection branch pipe.

[0011] In one embodiment of this utility model, the detection chamber is configured with an opening at the top and bottom, and the bottom of the detection chamber is connected at the connection port; a liquid level sensor is provided on the side wall of the detection chamber.

[0012] In one embodiment of this utility model, the cleaning chamber is also configured with an opening at the top and bottom, and an inlet pipe is provided in communication with the side wall of the cleaning chamber, a third solenoid valve is provided in communication with the inlet pipe, and a third solenoid valve is provided in communication with the bottom of the cleaning chamber.

[0013] In one embodiment of this utility model, the bracket is configured as a U-shaped structure, and a transmission belt is provided at both ends of the inner side of the bracket. The transmission belt is configured as a rectangular structure, and a support wheel is provided at each end corner of the inner side of the transmission belt. The central shaft of the support wheel is connected through the bracket by a bearing.

[0014] As one embodiment of this utility model, a motor is provided on the outside of the bracket, and the power vertical output shaft of the motor is connected to the central shaft of a support wheel located on the lower side.

[0015] As one embodiment of this utility model, a drive column is provided on the outer side of the transmission belt, and a convex shaft is fixedly provided at the end of the two drive columns that are close to each other. The convex shaft is inserted into the end of the connecting frame, and the connecting frame is installed on the top of the pH meter probe.

[0016] As one embodiment of this utility model, the connecting frame is threaded onto the pH meter probe, and the connecting frame is arranged along the length direction of the space formed by the two transmission belts. At the same time, slots are provided at the ends of the two connecting frames, and the convex shaft is inserted into the slot through a bearing connection.

[0017] The beneficial effects of this utility model are:

[0018] 1. This utility model is equipped with a detection branch pipe, and the higher end of the detection branch pipe is connected to the circulation pipe, while the lower end of the detection branch pipe is connected to the tail gas absorption tower. The connection between the detection branch pipe and the circulation pipe facilitates the return of liquid to the tail gas absorption tower and avoids waste of liquid.

[0019] 2. The present invention has a first solenoid valve and a second solenoid valve connected in communication on the detection branch pipe. The liquid can be trapped in the detection branch pipe by the cooperation of the first solenoid valve and the second solenoid valve, so that the liquid rises to the solution chamber, so that the pH meter probe can be inserted into the solution chamber to realize the acid and alkalinity detection of the liquid.

[0020] 3. This utility model is equipped with a transmission belt, and two transmission belts are distributed on both sides of the pH meter probe. At the same time, the transmission belt can rotate under the action of the motor, so as to control the pH meter probe to move back and forth along a predetermined route, so as to move between the cleaning chamber and the detection chamber, and insert the pH meter probe into the cleaning chamber and the detection chamber, thus providing support for cleaning the pH meter probe and detecting the acidity and alkalinity of the solution. Attached Figure Description

[0021] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model, making other features, objects, and characteristics of the utility model more apparent. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model.

[0022] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0023] Figure 2 This is a schematic diagram of the structure of the detection branch tube, solution chamber, and pH meter of this utility model;

[0024] Figure 3 This is a schematic diagram of the structure of the detection branch pipe of this utility model;

[0025] Figure 4 This is a schematic diagram of the solution chamber of this utility model;

[0026] Figure 5 This is a structural schematic diagram of the pH meter and its support of this utility model;

[0027] Figure 6 This is a schematic diagram of the structure of the pH meter of this utility model.

[0028] In the diagram: 1. Tail gas absorption tower; 11. Circulation pipe; 12. Circulation pump; 13. Control valve; 14. Instrument; 2. Detection branch pipe; 21. Pipe body; 22. First solenoid valve; 23. Second solenoid valve; 24. Connection port; 3. Solution chamber; 31. Cleaning chamber; 32. Detection chamber; 33. Liquid level sensor; 34. Liquid inlet pipe; 4. pH meter probe; 41. Connecting frame; 42. Slot; 5. Support; 51. Motor; 52. Transmission belt; 53. Support wheel. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0031] like Figure 1 As shown, in order to extend the service life of the pH meter and reduce the probability of damage, this embodiment provides a new pH meter measuring device. This device is installed on the circulation pipe 11 of the exhaust gas absorption tower 1, with the end furthest from the circulation pipe 11 connected to the exhaust gas absorption tower. The flow of the pH meter can be controlled as needed to store an appropriate amount of the liquid to be tested, enabling the detection of the liquid's acidity or alkalinity. After detecting the liquid's acidity or alkalinity, the pH meter is cleaned to reduce the probability of corrosion.

[0032] like Figure 2 , Figure 5 As shown, the pH meter measuring device specifically includes a detection branch tube 2, a solution chamber 3, a pH meter probe, and a support 5. The solution chamber 3 is installed at the bend of the detection branch tube 2 and is higher than the detection branch tube 2. Therefore, when the detection branch tube 2 is connected to the circulation pipe 11, a suitable amount of the liquid to be tested can be stored in the solution chamber 3. The pH meter probe 4 is mounted on the support 5, which is mounted on the solution chamber 3. The support 5 can control the movement of the pH meter probe 4 on the solution chamber 3, facilitating the determination of the acidity or alkalinity of the liquid to be tested and the cleaning of the pH meter probe 4.

[0033] The pH meter probe 4 described above is connected to the pH meter main unit via a wire. Since the pH meter is already publicly available and in practical use, it will only be briefly described here. The pH meter probe 4 includes a measuring electrode and a reference electrode. The pH meter main unit includes a high-impedance transducer, a display device, an operation panel, and a temperature compensation device. Therefore, after the pH meter probe 4 is inserted into the solution to be tested, the detection information is transmitted to the pH meter main unit, and the detection result can then be obtained from the pH meter main unit.

[0034] like Figure 3 As shown, in order to store an appropriate amount of the test liquid in the solution chamber 3 and avoid wasting the test liquid, the detection branch pipe 2 includes a vertical pipe body 21 and two horizontal pipe bodies 21 that are respectively connected to the upper and lower ends of the vertical pipe. Therefore, the two ends of the detection branch pipe 2 are at different heights. The higher end is connected to the circulation pipe 11, and the lower end is connected to the tail gas absorption tower. Therefore, when the detection branch pipe 2 is connected to the circulation pipe 11, the test liquid can flow back from the detection branch pipe 2 to the tail gas absorption tower.

[0035] like Figure 3 As shown, in order to achieve acid-base detection by retaining the liquid to be tested, a first solenoid valve 22 and a second solenoid valve 23 are respectively connected on the two horizontal pipes. Through the cooperation of the first solenoid valve 22 and the second solenoid valve 23, the liquid to be tested can be retained in the vertical pipe, and the liquid can be conveniently returned to the tail gas absorption tower 1.

[0036] like Figure 3 As shown, a connection port 24 is provided at the top of the detection branch pipe 2, and the solution chamber 3 is connected to the connection port 24. Therefore, when the liquid in the vertical pipe increases, the liquid can flow into the solution chamber 3, and thus a suitable amount of the liquid to be tested can be stored in the solution chamber 3.

[0037] like Figure 4 As shown, in order to realize the detection of the liquid to be tested and the cleaning of the pH meter probe 4, the solution chamber 3 includes a detection chamber 32 and a cleaning chamber 31. The detection chamber 32 is designed with an open top and bottom, and the bottom of the detection chamber 32 is connected to the connection port 24, so that the liquid in the vertical pipe can flow into the detection chamber 32. The cleaning chamber 31 is fixedly installed on the side of the detection chamber 32, and the cleaning chamber 31 is also designed with an open top and bottom. At the same time, an inlet pipe 34 is provided on the side wall of the cleaning chamber 31, and a third solenoid valve is provided on the inlet pipe 34. The inlet pipe 34 is connected to the cleaning liquid pipe or to the tap water, so that cleaning liquid can be injected into the cleaning chamber 31 to clean the pH meter probe 4 that is inserted into the cleaning chamber 31.

[0038] like Figure 4As shown, in order to drain the liquid from the cleaning chamber 31, a third solenoid valve is also installed at the bottom of the cleaning chamber 31. The flow of cleaning fluid can be controlled by operating the third solenoid valve. In order to detect the depth of the liquid in the cleaning chamber 31 and the detection chamber 32, and thus control the flow of liquid, a liquid level sensor 33, such as a hydrostatic level gauge, is installed on the side wall of both the cleaning chamber 31 and the detection chamber 32. The liquid level sensor 33 monitors the depth of the liquid in the cleaning chamber 31 and the detection chamber 32 in real time.

[0039] like Figure 5 As shown, in order to control the movement of the pH meter probe 4 between the cleaning chamber 31 and the detection chamber 32, and to control the insertion of the pH meter probe 4 into the cleaning chamber 31 and the detection chamber 32, the bracket 5 is set with a U-shaped structure, and a transmission belt 52 is set at both ends of the inner side of the bracket 5. The transmission belt 52 is set with a rectangular structure, and a support wheel 53 is set at the corner of the inner side of the transmission belt 52. The central shaft of the support wheel 53 is connected through the bracket 5 by a bearing. Therefore, the transmission belt 52 is stably supported by the support wheel 53. A drive column is provided on the outer side of each drive belt 52. A convex shaft is fixedly provided at the end of each drive column that is close to each other. The convex shaft is inserted into the end of the connecting frame 41, so that the connecting frame 41 is movably connected to the drive belt 52. The connecting frame 41 is installed on the top of the pH meter probe 4. Therefore, the connecting frame 41 and the pH meter probe 4 can be moved during the rotation of the drive belt 52. Under the action of gravity, the pH meter probe 4 is kept in a vertical state. Therefore, the connecting frame 41 can be controlled to move to the top of the cleaning chamber 31 and the detection chamber 32 under the action of the drive belt 52. As the drive belt 52 moves vertically upward, the pH meter probe 4 is inserted into the cleaning chamber 31 and the detection chamber 32, providing support for the acidity and alkalinity detection of the liquid to be tested and the cleaning of the pH meter probe 4.

[0040] like Figure 5 As shown, to control the movement of the transmission belt 52, a motor 51 (which can be a servo motor, stepper motor, etc.) is installed on the outside of the bracket 5. The vertical output shaft of the motor 51 is connected to the central shaft of a support wheel 53 located on the lower side. Therefore, the operation of the motor 51 controls the reciprocating rotation of the transmission belt 52, thereby controlling the movement of the pH meter probe 4 between the cleaning chamber 31 and the detection chamber 32. To control the synchronous rotation of the two transmission belts 52, a drive shaft can be connected to the central shaft of the two support wheels 53 directly opposite each other at the bottom of the two transmission belts 52 via a coupling. The drive shaft then transmits the power of the motor 51, thereby controlling the rotation of the two transmission belts 52 under the action of the motor 51. The aforementioned transmission belts 52 and support wheels 53 can be configured similarly to synchronous belts and synchronous pulleys.

[0041] like Figure 5 , Figure 6As shown, to achieve the movable connection between the connecting frame 41 and the driving column, the connecting frame 41 is arranged along the length of the space formed by the two transmission belts 52, and slots 42 are provided at the ends of both connecting frames 41. The convex shaft is inserted into the slot 42 through a bearing connection. Therefore, under the action of gravity, the pH meter probe 4 can be kept in a vertical state. In addition, the connecting frame 41 is threaded onto the pH meter probe 4.

[0042] like Figure 1 As shown, in order to inject liquid into the detection branch pipe 2, the two ends of the circulation pipe 11 are respectively connected and set at different positions of the tail gas absorption tower 1. The circulation pipe 11 is connected with a circulation pump 12, a control valve 13 and an instrument 14 (such as a pressure gauge, flow meter, etc.). Therefore, under the action of the circulation pump 12, the liquid can be pumped and circulated, and the liquid can be injected into the detection branch pipe 2 for convenience.

[0043] The aforementioned instruments 14, control valves 13, circulating pumps 12, motors 51, solenoid valves, etc. are connected to the DCS control system, and the DCS control system controls the various devices to work together.

[0044] When in use, open the solenoid valve of the detection branch pipe 2. The liquid in the tower is transported to the pH meter probe 4 by the circulation pump 12 for detection. Compare the pH value of the liquid in the tower with the set value to determine whether the alkaline washing solution in the tower needs to be replenished or replaced.

[0045] After each pH test, the pH meter is cleaned for 3-5 minutes via DCS control.

[0046] set up:

[0047] After 2 hours of continuous use, open the solenoid valve of detection branch pipe 2. The liquid in the tower is pumped to the pH meter for detection. If the detected pH is >12, close the solenoid valve of detection branch pipe 2, clean the pH meter, and set the next detection time to 2 hours later.

[0048] If the measured pH is 10-12, close the solenoid valve of the measuring branch pipe 2, clean the pH meter, and set the next measurement time to 1 hour later.

[0049] If the pH value is 8-10, close the solenoid valve of the detection branch pipe 2, clean the pH meter, and open the alkaline washing solution delivery valve to replenish or replace the alkaline washing solution in the tower. Set the next detection time to 0.5 hours later.

[0050] The specific testing time and corresponding pH range can be set according to the reaction scale or the specifications of the absorption tower.

[0051] In this embodiment, the pH meter is installed on the outlet bypass of the circulating pump, and a valve is set to intermittently detect the pH of the absorbent, which can extend the service life of the pH meter and reduce maintenance costs. Furthermore, based on the pH detection results, this embodiment compares the pH value of the liquid in the column bottom with the set value, which can accurately control the replenishment or replacement of the alkaline washing solution in the column bottom.

[0052] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0053] The above-described embodiments are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the appended claims.

Claims

1. A pH meter measuring device for exhaust emission control, characterized in that, It includes a detection branch pipe (2), one end of which is connected to the circulation pipe (11) and the other end of which is connected to the tail gas absorption tower (1). The two ends of the detection branch pipe (2) are at different heights. It also includes a solution chamber (3), which includes a detection chamber (32) and a cleaning chamber (31). The detection chamber (32) is connected to the detection branch pipe (2), and the cleaning chamber (31) is fixedly installed on the side of the detection chamber (32). A pH meter probe (4) is provided at the solution chamber (3). The pH meter probe (4) is mounted on a bracket (5). The bracket (5) is connected to the solution chamber (3) and controls the movement of the pH meter probe (4).

2. The pH meter measuring device for exhaust emission control according to claim 1, characterized in that, The two ends of the circulation pipe (11) are respectively connected and set at different positions of the tail gas absorption tower (1). A circulation pump (12), a control valve (13) and an instrument (14) are connected and set on the circulation pipe (11).

3. A pH meter measuring device for exhaust emission control according to claim 1, characterized in that, The detection branch pipe (2) includes a vertical pipe and two horizontal pipes that are connected to each other at the upper and lower ends of the vertical pipe. A first solenoid valve (22) and a second solenoid valve (23) are respectively connected to each other on the two horizontal pipes of the detection branch pipe (2), and a connection port (24) is provided at the top of the vertical pipe of the detection branch pipe (2).

4. A pH meter measuring device for exhaust emission control according to claim 3, characterized in that, The detection chamber (32) is configured with an opening at the top and bottom, and the bottom of the detection chamber (32) is connected to the connection port (24); a liquid level sensor (33) is provided on the side wall of the detection chamber (32).

5. A pH meter measuring device for exhaust emission control according to claim 4, characterized in that, The cleaning chamber (31) is also configured with an opening at the top and bottom, and an inlet pipe (34) is provided in communication with the side wall of the cleaning chamber (31). A third solenoid valve is provided in communication with the inlet pipe (34), and a third solenoid valve is provided in communication with the bottom of the cleaning chamber (31).

6. A pH meter measuring device for exhaust emission control according to claim 1, characterized in that, The bracket (5) is configured as a U-shaped structure, and transmission belts (52) are respectively provided at both ends of the inner side of the bracket (5). The transmission belts (52) are configured as rectangular structures, and support wheels (53) are provided at the corners of the inner side of the transmission belts (52). The central axis of the support wheel (53) is connected through the bracket (5) by a bearing.

7. A pH meter measuring device for exhaust emission control according to claim 6, characterized in that, A motor (51) is provided on the outside of the bracket (5), and the power vertical output shaft of the motor (51) is connected to the central shaft of a support wheel (53) located on the lower side.

8. A pH meter measuring device for exhaust emission control according to claim 7, characterized in that, A drive column is provided on the outside of the transmission belt (52). A convex shaft is fixedly provided at one end of the two drive columns that are close to each other. The convex shaft is inserted into the end of the connecting frame (41), and the connecting frame (41) is installed on the top of the pH meter probe (4).

9. A pH meter measuring device for exhaust emission control according to claim 8, characterized in that, The connecting frame (41) is threaded onto the pH meter probe (4), and the connecting frame (41) is arranged along the length of the space formed by the two transmission belts (52). At the same time, slots (42) are provided at the ends of the two connecting frames (41), and the convex shaft is inserted into the slot (42) through a bearing connection.

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