PH measuring device and PH measuring system for desulfurizing absorption tower

Abstract

The invention provides a PH measuring device and a PH measuring system for a desulfurizing absorption tower, and relates to the technical field of environmental protection engineering.The PH measuring device comprises an air inlet pipe, a PH measuring mechanism, a filtering mechanism and an air outlet pipe, an air inlet of a purifying box is connected with the air inlet pipe, the PH measuring mechanism is arranged in the air inlet pipe, and an air outlet of the purifying box is connected with the air outlet pipe; the purification box is divided into a first cavity and a second cavity through a partition plate, the filtering mechanism is arranged in the first cavity, the sulfur removal mechanism is arranged in the second cavity, discharged flue gas enters the first cavity and the second cavity from an air inlet pipe of the purification box, the PH value of the flue gas entering the air inlet pipe is detected through the PH measuring mechanism, and the flue gas enters the first cavity and the second cavity. Smoke dust, sulfur dioxide and oxynitride in the flue gas are removed through the filtering mechanism, then the flue gas is discharged to the outside through the air outlet pipe, the flue gas is purified to reach the standard of being discharged to the outside, and pollution to the environment is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of environmental protection engineering, and in particular to a pH measuring device and a pH measuring system for a desulfurization absorption tower. Background Art

[0002] With the development of the power industry, the pollutants generated by thermal power plants in the process of power production are also increasing. SO2 emitted during the combustion of coal is the main pollutant that causes acid rain and greenhouse effect.

[0003] According to national environmental protection requirements, thermal power plants are required to build desulfurization systems, and most of them use wet desulfurization treatment processes. Wet desulfurization treatment processes refer to the use of liquid containing limestone slurry to wash sulfur-containing flue gas to remove SO2, and can adapt to the desulfurization treatment of large-capacity units with high concentrations of SO2. The limestone absorbent consumed in the production process is low-priced and easy to obtain, and the gypsum by-product produced has high commercial value.

[0004] As one of the most important equipment in the process of exhaust gas desulfurization, the desulfurization absorber is used to convert harmful gases such as sulfur dioxide into harmless byproducts through the reaction of the alkaline solution in the absorber with the acidic gas. The desulfurization effect is closely related to the pH value of the solution in the absorber. Too high or too low pH value may lead to a decrease in desulfurization efficiency. Therefore, in view of the above situation, it is urgent to develop a desulfurization absorber pH measurement device and pH measurement system to overcome the shortcomings in current practical applications. Summary of the invention

[0005] The present invention provides a desulfurization absorption tower pH measurement device and a pH measurement system, which are used to solve the defects in the prior art.

[0006] The present invention provides a desulfurization absorption tower pH measurement device and a pH measurement system, comprising: an air inlet pipe, a pH measurement mechanism, a filtering mechanism, and an air outlet pipe, wherein the air inlet of a purification box is connected to the air inlet pipe, the air inlet pipe is provided with a pH measurement mechanism, the air outlet of the purification box is connected to the air outlet pipe, the purification box is divided into a first cavity and a second cavity by a partition, the filtering mechanism is arranged in the first cavity, and the desulfurization mechanism is arranged in the second cavity.

[0007] Preferably, the first cavity and the second cavity are arranged in a left-right spacing, and the filtering mechanism includes: A rotating shaft is rotatably arranged between the left and right inner walls of the first cavity, a fan is arranged on the rotating shaft, the cleaning brush is arranged on the right side of the fan blades, the cleaning brush rotates synchronously with the fan, a motor is arranged on the side wall of the air inlet pipe, the motor is connected to the rotating shaft in transmission, the filter assembly is arranged on the inner wall of the air inlet pipe, and the bristles of the cleaning brush are close to the filter mechanism.

[0008] Preferably, the filtering component includes sliding rods. Two groups of the sliding rods are arranged on the inner wall of the air inlet pipe. The mesh plate and the adsorption plate are slidably arranged on the sliding rods. Filter holes are formed in the mesh plate. Activated carbon is arranged in the adsorption plate. The water storage tank is arranged on the inner wall of the air inlet pipe. The top of the water storage tank is provided with a water inlet and a water outlet. The water outlet is connected to the water discharge port of the first water pump. The water suction port of the first water pump is arranged at the bottom of the air inlet pipe. A first spray head is arranged on one side of the water storage tank. A heat absorption frame is arranged at the bottom of the water storage tank. The inside of the heat absorption frame is communicated with the inside of the water storage tank.

[0009] Preferably, a flue gas purification system for a thermal power plant, characterized in that it includes a flue gas purification device for a thermal power plant as described in any one of the above, and the flue gas purification device for a thermal power plant further includes: a desulfurization mechanism. The desulfurization mechanism includes a liquid storage tank. Two baffle plates are arranged on the inner wall of the air inlet pipe. A demisting plate is arranged on the baffle plates. The liquid storage tank is arranged on the inner wall of the air inlet pipe between the two baffle plates. Sodium hydroxide solution is placed in the liquid storage tank. A second spray head is arranged on one side of the liquid storage tank. A first filter plate is inserted between the two baffle plates. A second water pump is arranged at the top of the air inlet pipe. The water suction end of the second water pump is arranged at the bottom of the air inlet pipe. The water discharge end of the second water pump is communicated with the liquid storage tank.

[0010] Preferably, a pH measurement system, characterized in that it includes a pH measurement device for a desulfurization absorption tower as described in any one of the above, and the pH measurement system further includes:.

[0011] Preferably, molecular sieves are arranged in the air outlet pipe. A nitride concentration detector and a rotating plate are arranged on the inner wall of the air outlet pipe above the molecular sieves. A second motor is arranged on the outer wall of the air outlet pipe. The second motor is in transmission connection with the rotating plate. The second motor is electrically connected to the nitride concentration detector.

[0012] Preferably, it further includes a maintenance mechanism disposed on one side of the air outlet pipe. The maintenance mechanism includes a maintenance cabin fixedly arranged on the outer wall of the air outlet pipe. The third motor is fixedly arranged on the top of the maintenance cabin. The output end of the third motor is connected with a threaded column. The first rotating wheel, the second rotating wheel and the third rotating wheel are respectively rotatably arranged on the inner wall of the maintenance cabin. The first rotating wheel and the second rotating wheel are respectively meshed with the threaded column. The first rotating wheel and the third rotating wheel are connected by a belt drive. The screw rod is rotatably arranged on the inner wall of the maintenance cabin. The top of the screw rod is meshed with the first rotating wheel. The first movable sleeve is sleeved on the screw rod, and the inner wall of the first movable sleeve is meshed with the external thread of the screw rod. One end of a telescopic rod is hinged to the first movable sleeve, and the other end of the telescopic rod is hinged to the second movable sleeve. A partition plate is rotatably arranged inside the outer wall of the air outlet pipe. A vertical rod is fixedly arranged on one side of the partition plate. The second movable sleeve is slidably sleeved on the vertical rod. A sliding plate is inserted at the bottom of the air outlet pipe and the maintenance cabin, and a lifting plate is inserted at the top of the maintenance cabin. The bottom of the sliding plate is meshed with the outer surface of the third rotating wheel. The lifting door is meshed with the third rotating wheel through teeth arranged on the inner wall.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The discharged flue gas enters the first cavity and the second cavity from the air inlet pipe 1 of the purification box. The PH measurement mechanism detects the PH value of the flue gas entering the air inlet pipe. The dust, sulfur dioxide and nitrogen oxides in the flue gas are removed through the filtering mechanism, and then discharged to the outside through the air outlet pipe, so as to purify the flue gas to meet the standard of discharging to the outside and reduce the pollution to the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0015] Figure 1 It is a schematic diagram of the overall structure provided by an embodiment of the present invention; Figure 2 It is a schematic diagram of a partial cross-sectional structure provided by an embodiment of the present invention; Figure 3 It is a schematic diagram of the structure of the maintenance mechanism provided by an embodiment of the present invention.

[0016] Reference numerals: 1. Air inlet pipe; 2. Filter mechanism; 21. Cleaning brush; 22. Motor 1; 23. Rotating shaft; 24. Fan; 25. Filter component; 251. Sliding rod; 252. Mesh plate; 253. Adsorption plate; 254. Water storage tank; 255. Heat absorption frame; 256. Water pump 1; 257. Sprinkler 1; 258. Water inlet; 259. Water outlet; 2591. Drain port; 2592. Water pumping port; 3. Desulfurization mechanism; 31. Liquid storage tank; 32. Sprinkler 2; 33. Filter plate 1; 34. Water pump 2; 35. Baffle plate; 4. Air outlet pipe; 41. Molecular sieve; 42. Nitride concentration detector; 43. Rotating plate; 44. Motor 2; 5. Demisting plate; 6. Maintenance mechanism; 61. Maintenance cabin; 62. Motor 3; 63. Threaded column; 64. Partition plate; 65. Sliding plate; 66. Rotating wheel 1; 67. Rotating wheel 2; 68. Rotating wheel 3; 69. Screw rod; 691. Moving sleeve 1; 692. Telescopic rod; 693. Moving sleeve 2; 694. Vertical rod; 695. Lifting door; 7. Purification tank; 8. PH measurement mechanism. Detailed implementation manners

[0017] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below with reference to the accompanying drawings in the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without creative efforts shall fall within the protection scope of the present invention.

[0018] In addition, in the present invention, descriptions such as "first" and "second" are only for descriptive purposes, and do not particularly refer to the meaning of order or sequence, nor are they used to limit the present invention. They are merely used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions and technical features between various embodiments may be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0019] The present invention provides the following embodiments Embodiment 1 The embodiment of the present invention provides a PH measurement device and a PH measurement system for a desulfurization absorption tower, as Figures 1 - 3As shown, it includes: an air inlet pipe 1, a pH measuring mechanism 8, a filtering mechanism 2, and an air outlet pipe 4. The air inlet of the purification box 7 is connected to the air inlet pipe 1, and the pH measuring mechanism 8 is arranged in the air inlet pipe 1. The air outlet of the purification box 7 is connected to the air outlet pipe 4. The purification box 7 is divided into a first cavity and a second cavity by a partition. The filtering mechanism 2 is arranged in the first cavity, and the desulfurization mechanism 3 is arranged in the second cavity.

[0020] The working principle and beneficial effects of the above technical solution are as follows: the discharged flue gas enters the first cavity and the second cavity from the air inlet pipe 1 of the purification box 7, the pH measuring mechanism 8 detects the pH value of the flue gas entering the air inlet pipe 1, and the smoke, sulfur dioxide and nitrogen oxides in the flue gas are removed by the filtering mechanism 2, and then discharged to the outside from the air outlet pipe 4, and the flue gas is purified to meet the standards for discharge to the outside, thereby reducing the pollution caused to the environment.

[0021] Example 2 On the basis of Example 1, Figures 1 - 3 As shown, the filtering mechanism 2 includes a rotating shaft 23, a rotating shaft 23 is rotatably arranged between the air inlet pipe 1 and the filtering mechanism 2, a fan 24 is arranged on the rotating shaft 23, the cleaning brush 21 is arranged on the right side of the blades of the fan 24, the cleaning brush 21 rotates synchronously with the fan 24, a motor 22 is arranged on the side wall of the air inlet pipe 1, the motor 22 is transmission-connected with the rotating shaft, the filtering assembly 25 is arranged on the inner wall of the air inlet pipe 1, and the bristles of the cleaning brush 21 are close to the filtering mechanism 2.

[0022] The working principle and beneficial effects of the above technical solution are as follows: the motor 22 provides power for the rotation of the rotating shaft 23, the rotating shaft 23 drives the fan 24 and the cleaning brush 21 to rotate, the fan 24 sucks the smoke into the air inlet pipe 1, and the cleaning brush 21 is arranged at the right end of the fan 24, which neither affects the rotation of the fan 24 to generate suction nor can it clean the mesh plate 252 in the filter mechanism 2, thereby preventing the filter mechanism 2 from being blocked by smoke accumulation due to long-term use, thereby maintaining the excellent filtering performance of the filter mechanism 2.

[0023] Example 3 On the basis of Example 2, Figures 1 - 3As shown in the figure, the filtering component 25 includes a sliding rod 251. Two groups of the sliding rods 251 are arranged on the inner wall of the air inlet pipe 1. A mesh plate 252 and an adsorption plate 253 are slidably arranged on the sliding rod 251. Filter holes are formed in the mesh plate 252, and activated carbon is arranged in the adsorption plate 253. A water storage tank 254 is arranged on the inner wall of the air inlet pipe 1. An inlet 258 and an outlet 259 are arranged at the top of the water storage tank 254. The outlet 259 is connected to the water discharge port 2591 of a first water pump 256. The water suction port 2592 of the first water pump 256 is arranged at the bottom of the air inlet pipe 1. A first spray head 257 is arranged on one side of the water storage tank 254. A heat absorption frame 255 is arranged at the bottom of the water storage tank 254, and the interior of the heat absorption frame 255 communicates with that of the water storage tank 254.

[0024] The working principle and beneficial effects of the above technical solution are as follows: The mesh plate 252 and the adsorption plate 253 move along the sliding rod 251, and the position distance between the mesh plate 252 and the adsorption plate 253 can be adjusted. The connection positions of the mesh plate 252 and the adsorption plate 253 with the sliding rod 251 are fastened by bolts. The mesh plate 252 filters the dust in the flue gas, and the activated carbon in the adsorption plate 253 adsorbs the nitrogen oxides in the flue gas. The water inlet pipe fixes the water storage tank 254. Water is poured into the water storage tank 254 from the inlet 258. Then the water enters the heat absorption frame 255 and sprays out from the first spray head 257 respectively. The water sprayed out from the first spray head 257 passes through the passing flue gas. The sprayed water absorbs the heat of the flue gas and further adsorbs the dust in the flue gas. The water falling to the bottom of the air inlet pipe 1 is sucked into the water discharge port 2591 from the water suction port 2592 by the first water pump 256 and then poured into the water storage tank 254. At the same time, the flue gas passing through the heat absorption frame 255 transfers heat into the heat absorption frame 255. The heat absorption frame 255 conducts the heat into the water therein. The water carries the heat into the water storage frame and then is discharged together from the outlet 259, realizing the collection and utilization of waste heat. The heat absorption frame 255 is arranged close to the air inlet pipe 1, increasing the contact area between the flue gas and the heat absorption frame 255 and improving the heat absorption efficiency.

[0025] Embodiment 4 On the basis of Embodiment 3, as Figures 1 - 3As shown, the present invention also provides a PH measurement system, characterized in that it includes a desulfurization absorption tower PH measurement device as described in any one of the items, and the PH measurement system also includes: a desulfurization mechanism 3, the desulfurization mechanism 3 includes a liquid storage tank 31, two baffles 35 are arranged on the inner wall of the air inlet pipe 1, and a defogger plate 5 is arranged on the baffle plate 35, the liquid storage tank 31 is arranged on the inner wall of the air inlet pipe 1 between the two baffle plates 35, a sodium hydroxide solution is placed in the liquid storage tank 31, a spray head 32 is arranged on one side of the liquid storage tank 31, a filter plate 33 is inserted between the two baffle plates 35, a water pump 34 is arranged at the top of the air inlet pipe 1, the water pumping end of the water pump 34 is arranged at the bottom of the air inlet pipe 1, and the water discharge end of the water pump 34 is connected to the liquid storage tank 31.

[0026] The working principle and beneficial effects of the above technical solution are as follows: the sodium hydroxide solution in the liquid storage tank 31 reacts with the sulfur dioxide in the flue gas passing through its bottom to generate water and calcium sulfite solids, the sieve plate 2 screens out the calcium sulfite solids, and the filter plate 1 33 is pulled out to remove the calcium sulfite solids, the barrier plate 35 blocks the liquid to prevent the sodium hydroxide solution of the demister plate 5 from entering the filter mechanism 2 and the air outlet pipe 4, the demister plate 5 absorbs the water vapor and solution contaminated by the flue gas when it passes through the air inlet pipe 1 and the air outlet pipe 4, so that the flue gas reaching the air outlet pipe 4 is kept as dry as possible, the water pump 2 34 draws the water and sodium hydroxide solution that falls into the bottom of the air inlet pipe 1 into the liquid storage tank 31, so as to achieve the purpose of multiple recycling, and when the concentration of the sodium hydroxide solution is too low, a new sodium hydroxide solution is replaced, thereby saving material costs.

[0027] Example 5 On the basis of Example 4, Figures 1 - 3 As shown, a molecular sieve 41 is arranged in the air outlet pipe 4, a nitride concentration detector 42 and a rotating plate 43 are arranged on the inner wall of the air outlet pipe 4 above the molecular sieve 41, and a motor 44 is arranged on the outer wall of the air outlet pipe 4, the motor 44 is transmission-connected to the rotating plate 43, and the motor 44 is electrically connected to the nitride concentration detector 42.

[0028] The working principle and beneficial effects of the above technical solution are as follows: the filtered flue gas enters the air outlet pipe 4 under the action of wind, the molecular sieve 41 (zeolite or natural zeolite) adsorbs the nitrogen oxides in the flue gas, and the nitride concentration detector 42 detects the flue gas in the air outlet pipe 4. When the nitride concentration meets the specified value, the motor 44 starts to drive the rotating plate 43 to rotate to a vertical state, and the air outlet pipe 4 opens to discharge the flue gas. When the nitride concentration does not meet the specified value, the motor 44 starts to drive the rotating plate 43 to rotate to a horizontal state, and the air outlet pipe 4 is closed to prohibit the flue gas from being discharged.

[0029] Example 6 Based on Embodiment 5, as Figures 1 - 3 shown, it further includes a maintenance mechanism 6. The maintenance mechanism 6 is arranged on one side of the air outlet pipe 4. The maintenance mechanism 6 includes a maintenance cabin 61. The maintenance cabin 61 is fixedly arranged on the outer wall of the air outlet pipe 4. A third motor 62 is fixedly arranged on the top of the maintenance cabin 61. The output end of the third motor 62 is connected with a threaded column 63. A first rotating wheel 66, a second rotating wheel 67 and a third rotating wheel 68 are respectively rotatably arranged on the inner wall of the maintenance cabin 61. The first rotating wheel 66 and the second rotating wheel 67 are respectively meshed with the threaded column 63. The first rotating wheel 66 is connected with the third rotating wheel 68 through a belt drive. A screw rod 69 is rotatably arranged on the inner wall of the maintenance cabin 61. The top of the screw rod 69 is meshed with the first rotating wheel 66. A first moving sleeve 691 is sleeved on the screw rod 69, and the inner wall of the first moving sleeve 691 is meshed with the external thread of the screw rod 69. One end of a telescopic rod 692 is hinged to the first moving sleeve 691. The other end of the telescopic rod 692 is hinged to a second moving sleeve 693. An isolation plate 64 is rotatably arranged inside the outer wall of the air outlet pipe 4. A vertical rod 694 is fixedly arranged on one side of the isolation plate 64. The second moving sleeve is slidably sleeved on the vertical rod 694. A sliding plate 65 is inserted at the bottom of the air outlet pipe 4 and the maintenance cabin 61. The bottom of the sliding plate 65 is meshed with the outer surface of the third rotating wheel 68. A lifting plate is inserted at the top of the maintenance cabin 61. The lifting door 695 is meshed with the third rotating wheel 68 through teeth arranged on the inner wall.

[0030] The working principle and beneficial effects of the above technical solution are as follows: It further includes a maintenance mechanism 6, which is arranged on one side of the air outlet pipe 4. The maintenance mechanism 6 includes a maintenance cabin 61, and the maintenance cabin 61 is fixedly arranged on the outer wall of the air outlet pipe 4. A third motor 62 is fixedly arranged on the top of the maintenance cabin 61. The output end of the third motor 62 is connected with a threaded column 63. A first rotating wheel 66, a second rotating wheel 67 and a third rotating wheel 68 are respectively rotatably arranged on the inner wall of the maintenance cabin 61. The first rotating wheel 66 and the second rotating wheel 67 are respectively meshed with the threaded column 63. The first rotating wheel 66 is connected with the third rotating wheel 68 through a belt drive. A screw rod 69 is rotatably arranged on the inner wall of the maintenance cabin 61. The top of the screw rod 69 is meshed with the first rotating wheel 66. A first moving sleeve 691 is sleeved on the screw rod 69, and the inner wall of the first moving sleeve 691 is meshed with the external thread of the screw rod 69. One end of a telescopic rod 692 is hinged to the first moving sleeve 691, and the other end of the telescopic rod 692 is hinged to a second moving sleeve 693. An isolation plate 64 is rotatably arranged inside the outer wall of the air outlet pipe 4. A vertical rod 694 is fixedly arranged on one side of the isolation plate 64. The moving sleeve is slidably sleeved on the vertical rod 694. A sliding plate 65 is inserted at the bottom of the air outlet pipe 4 and the maintenance cabin 61. The bottom of the sliding plate 65 is meshed with the outer surface of the third rotating wheel 68. A lifting plate is inserted at the top of the maintenance cabin 61. The lifting door 695 is meshed with the third rotating wheel 68 through teeth arranged on the inner wall.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. Desulfurization absorption tower pH measurement device, characterized in that, Comprising: An air inlet pipe (1), a PH measuring mechanism (8), a filtering mechanism (2), and an air outlet pipe (4). The air inlet of the purification box (7) is connected to the air inlet pipe (1). The PH measuring mechanism (8) is arranged inside the air inlet pipe (1). The air outlet of the purification box (7) is connected to the air outlet pipe (4). The purification box (7) is separated into a first cavity and a second cavity by a partition board. The filtering mechanism (2) is arranged in the first cavity, and the desulfurization mechanism (3) is arranged in the second cavity.

2. The pH measurement device for the desulfurization absorption tower according to claim 1, characterized in that The first cavity and the second cavity are arranged at intervals left and right. The filtering mechanism (2) includes: A rotating shaft (23). The rotating shaft (23) is rotatably arranged between the inner walls on the left and right sides of the first cavity. A fan (24) is arranged on the rotating shaft (23). A cleaning brush (21) is arranged on the right side of the fan blades of the fan (24). The cleaning brush (21) rotates synchronously with the fan (24). A first motor (22) is arranged on the side wall of the air inlet pipe (1). The first motor (22) is in transmission connection with the rotating shaft. A filtering component (25) is arranged on the inner wall of the air inlet pipe (1). The bristles of the cleaning brush (21) are close to the filtering mechanism (2).

3. The pH measurement device for a desulfurization absorption tower according to claim 2, wherein, The filtering component (25) includes sliding rods (251). Two groups of sliding rods (251) are arranged on the inner wall of the air inlet pipe (1). A mesh plate (252) and an adsorption plate (253) are slidably arranged on the sliding rods (251). Filter holes are formed in the mesh plate (252). Activated carbon is arranged inside the adsorption plate (253). A water storage tank (254) is arranged on the inner wall of the air inlet pipe (1). An inlet (258) and an outlet (259) are arranged at the top of the water storage tank (254). The outlet (259) is connected to the water discharge port (2591) of a first water pump (256). The water suction port (2592) of the first water pump (256) is arranged at the bottom of the air inlet pipe (1). A first spray head (257) is arranged on one side of the water storage tank (254). A heat absorption frame (255) is arranged at the bottom of the water storage tank (254). The inside of the heat absorption frame (255) is communicated with the inside of the water storage tank (254).

4. A pH measurement system, characterized in that, Including the desulfurization absorption tower PH measuring device according to any one of claims 1-3. The PH measuring system further includes: a desulfurization mechanism (3). The desulfurization mechanism (3) includes a liquid storage tank (31). Two baffle plates (35) are arranged on the inner wall of the air inlet pipe (1). A demisting plate (5) is arranged on the baffle plates (35). The liquid storage tank (31) is arranged on the inner wall of the air inlet pipe (1) between the two baffle plates (35). Sodium hydroxide solution is placed in the liquid storage tank (31). A second spray head (32) is arranged on one side of the liquid storage tank (31). A first filter plate (33) is inserted between the two baffle plates (35). A second water pump (34) is arranged at the top of the air inlet pipe (1). The water suction end of the second water pump (34) is arranged at the bottom of the air inlet pipe (1). The water discharge end of the second water pump (34) is communicated with the liquid storage tank (31).

5. The PH measurement system according to claim 4, characterized in that, A molecular sieve (41) is arranged in the air outlet pipe (4). A nitride concentration detector (42) and a rotating plate (43) are arranged on the inner wall of the air outlet pipe (4) above the molecular sieve (41). A second motor (44) is arranged on the outer wall of the air outlet pipe (4). The second motor (44) is in transmission connection with the rotating plate (43), and the second motor (44) is electrically connected with the nitride concentration detector (42).

6. The pH measurement system according to claim 5, wherein The maintenance mechanism (6) is arranged on one side of the air outlet pipe (4). The maintenance mechanism (6) includes a maintenance cabin (61). The maintenance cabin (61) is fixedly arranged on the outer wall of the air outlet pipe (4). A third motor (62) is fixedly arranged on the top of the maintenance cabin (61). The output end of the third motor (62) is connected with a threaded column (63). A first rotating wheel (66), a second rotating wheel (67) and a third rotating wheel (68) are respectively rotatably arranged on the inner wall of the maintenance cabin (61). The first rotating wheel (66) and the second rotating wheel (67) are respectively meshed with the threaded column (63). The first rotating wheel (66) is in belt transmission connection with the third rotating wheel (68). A screw rod (69) is rotatably arranged on the inner wall of the maintenance cabin (61). The top of the screw rod (69) is meshed with the first rotating wheel (66). A first moving sleeve (691) is sleeved on the screw rod (69), and the inner wall of the first moving sleeve (691) is meshed with the external thread of the screw rod (69). One end of a telescopic rod (692) is hinged to the first moving sleeve (691). The other end of the telescopic rod (692) is hinged to a second moving sleeve (693). An isolation plate (64) is rotatably arranged in the outer wall of the air outlet pipe (4). A vertical rod (694) is fixedly arranged on one side of the isolation plate (64). The second moving sleeve is slidably sleeved on the vertical rod (694). A sliding plate (65) is inserted at the bottom of the air outlet pipe (4) and the maintenance cabin (61). A lifting plate is inserted at the top of the maintenance cabin (61). The bottom of the sliding plate (65) is meshed with the outer surface of the third rotating wheel (68). A lifting door (695) is meshed with the third rotating wheel (68) through teeth arranged on the inner wall.

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