A kind of on-line pH detection device for desulfurization slurry
Patent Information
- Application Number
- CN202522024280.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-20
- Publication Date
- 2026-09-18
- Estimated Expiration
- 2035-09-20
AI Technical Summary
[0004]为使锅炉或炉窑来的污染物烟气的酸性物质得到连续不断的吸收反应，使烟气中酸性物质和吸收剂保持连续性的物料平衡，必须不断地向吸收塔循环浆液内添加新鲜的吸收剂石灰石（石灰）浆液，以补充吸收反应消耗的吸收剂，必须控制吸收塔下部氧化反应槽的循环浆液有合理的连续吸收、反应、氧化成副产物的环境，就是必须控制循环浆液的PH值范围，反应氧化槽内循环浆液的实时在线PH值范围，是自动调节加入循环浆液内吸收剂石灰石(石灰)浆液流量的依据之一，也是湿法脱硫吸收塔系统烟气中酸性污染物和吸收剂连续吸收、反应、氧化成副产物物料平衡关键依据之一，现有的PH检测方式是直接在反应槽内安装PH计，由于反应槽内环境复杂，循环浆液流动（介质）不均匀、不能实时全面反映循环浆液的PH值情况、维护保养不方便的问题
[0008] With this invention, the pH value is not directly measured inside the desulfurization absorption tower. Instead, the slurry in the bottom reaction oxidation tank is carried out to the outer cylinder, where it is accurately measured by two online pH meters in two dynamic measuring tanks. Furthermore, the outer cylinder is located outside the desulfurization absorption tower, making maintenance and upkeep convenient.
Smart Images
Figure CN224773004U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of wet desulfurization reaction slurry or liquid measurement technology, specifically to an online pH detection device for desulfurization slurry. Background Technology
[0002] The flue gas from boilers or kilns generates significant amounts of pollutants and is treated using an advanced limestone (lime)-gypsum wet desulfurization process. The flue gas from the boiler or industrial kiln enters the lower part of the desulfurization absorption tower and flows upwards. The washing circulating slurry at the bottom of the absorption tower is atomized and sprayed downwards through a circulating pipeline by a desulfurization circulating pump into the spray layer pipeline at the top of the absorption tower. During the spraying process, acidic components in the flue gas, such as SO2, SO3, HF, and HCl, are absorbed and sprayed downwards into the circulating slurry oxidation reaction tank at the bottom of the absorption tower. The desulfurization absorbent, limestone CaCO3 (or lime CaO), reacts with the acidic substances in the desulfurization tower (oxidation reaction tank) and is oxidized into gypsum slurry CaSO4·2H2O (circulating slurry). (See attached diagram). Figure 1 Schematic diagram of a wet desulfurization tower system.
[0003] The functions of the circulating oxidation reaction tank are: to store circulating slurry, oxidize sulfite to sulfate (CaSO4·2H2O), dissolve new absorbent limestone (lime), react sulfate with the newly dissolved absorbent to form gypsum, and allow the slurry in the oxidation reaction tank to have sufficient absorption, reaction and oxidation time under the multiple circulation of the circulating pump to generate by-product sulfate (CaSO4·2H2O) in the oxidation reaction tank. A certain residence time of the circulating slurry in the oxidation reaction tank is a condition for the formation of good by-product gypsum crystals (CaSO4·2H2O).
[0004] To ensure the continuous absorption and reaction of acidic substances in the flue gas from boilers or kilns, and to maintain a continuous material balance between the acidic substances and the absorbent, fresh limestone (lime) slurry must be continuously added to the circulating slurry of the absorption tower to replenish the absorbent consumed in the absorption reaction. It is essential to control the pH range of the circulating slurry in the oxidation reaction tank at the bottom of the absorption tower to provide a suitable environment for continuous absorption, reaction, and oxidation into by-products. The real-time online pH range of the circulating slurry in the oxidation reaction tank is one of the bases for automatically adjusting the flow rate of limestone (lime) slurry added to the circulating slurry, and is also a key basis for maintaining the material balance of acidic pollutants in the flue gas and the absorbent in the wet desulfurization absorption tower system. The existing pH detection method involves directly installing a pH meter in the reaction tank. However, due to the complex environment inside the reaction tank, uneven flow of the circulating slurry (medium), and the inability to comprehensively reflect the pH value of the circulating slurry in real time, maintenance is inconvenient. Summary of the Invention
[0005] To address the aforementioned technical problems, this utility model provides an online pH detection device for desulfurization slurry, which can conveniently and accurately detect pH online and is easy to maintain.
[0006] The technical solution is as follows: an online pH detection device for desulfurization slurry, characterized in that it includes an outer cylinder disposed outside the desulfurization absorption tower, wherein a measuring tank partition is disposed inside the outer cylinder to separate a dynamic measuring tank one and a dynamic measuring tank two, and an online pH meter one extending into the dynamic measuring tank one and an online pH meter two extending into the dynamic measuring tank two are installed on the top of the outer cylinder, the medium outlet of the dynamic measuring tank one is connected to the desulfurization absorption tower through a medium outlet pipe one, and the medium inlet is connected to a medium inlet pipe one, the medium outlet of the dynamic measuring tank two is connected to the desulfurization absorption tower through a medium outlet pipe two, and the medium inlet is connected to a medium inlet pipe two, the medium inlet pipe one and the medium inlet pipe two are connected to a slurry circulation pipe, and overflow baffles are disposed near the medium outlet in both the dynamic measuring tank one and the dynamic measuring tank two.
[0007] A further feature is that both the first medium inlet pipe and the second medium inlet pipe are equipped with an inlet control valve and a cut-off flow rate control valve plate and are connected to a flushing pipe, and a flushing water control valve is installed on the flushing pipe. The first dynamic measurement pool and the second dynamic measurement pool are respectively connected to the drain pipe; The top of the outer cylinder is equipped with a top cover plate, and a pH meter flange mounting seat is installed on the top cover plate by fasteners. Both the online pH meter one and the online pH meter two are installed on the pH meter flange mounting seat through pH meter flanges.
[0008] With this invention, the pH value is not directly measured inside the desulfurization absorption tower. Instead, the slurry in the bottom reaction oxidation tank is carried out to the outer cylinder, where it is accurately measured by two online pH meters in two dynamic measuring tanks. Furthermore, the outer cylinder is located outside the desulfurization absorption tower, making maintenance and upkeep convenient. Attached Figure Description
[0009] Figure 1 This is a schematic diagram of a wet desulfurization tower system; Figure 2 This is a schematic diagram of the application of this utility model in a wet desulfurization tower; Figure 3 This is a front view of the structure of this utility model; Figure 4 This is a top view of the connecting medium inlet pipe of this utility model; Figure 5 for Figure 4 Rotational view of the cross section in the CC direction. Detailed Implementation
[0010] See Figures 2 to 5 As shown, an online pH monitoring device for desulfurization slurry includes an outer cylinder 15 disposed outside the desulfurization absorption tower. The bottom of the outer cylinder 15 is sealed by a bottom plate, and an upper cover plate 7 is installed on the top. The upper cover plate 7 is supported on an upper cover plate seat 9 on the inner wall of the outer cylinder 15. The upper cover plate 7 is fixed by upper cover plate fasteners 6, and an upper cover plate sealing gasket 8 is provided between the upper cover plate seat 9 and the upper cover plate 7. A measuring cell partition 12 is provided inside the outer cylinder 15 to separate a dynamic measuring cell 11 and a dynamic measuring cell 2 13. An online pH meter 3 extending into the dynamic measuring cell 11 and an online pH meter 2 extending into the dynamic measuring cell 2 13 are installed on the upper cover plate 7. Both the online pH meter 3 and the online pH meter 2 are installed on the pH meter flange 1. The pH meter flange mounting base 5 is installed on the upper cover plate 7 via flange fasteners 4. The medium outlet of dynamic measuring tank 11 is connected to the desulfurization absorption tower via medium outlet pipe 24, and the medium inlet is connected to medium inlet pipe 19. The medium outlet of dynamic measuring tank 23 is connected to the desulfurization absorption tower via medium outlet pipe 22, and the medium inlet is connected to medium inlet pipe 27. Medium inlet pipe 19 and medium inlet pipe 27 are connected to slurry circulation pipe 17. A slurry inlet main control valve 16 is installed on slurry circulation pipe 17. The slurry circulation pipe 17 sends the medium (slurry) out of the oxidation reaction tank through a detection pump. Overflow baffles 10 are installed near the medium outlet in both dynamic measuring tank 11 and dynamic measuring tank 23.
[0011] The continuous slurry delivered by the slurry detection pump (or gypsum slurry discharge pump) of the desulfurization absorption tower system enters the dynamic measurement tank 11 and the dynamic measurement tank 23. After the measurement tank is full of slurry, the pH meter electrode has been submerged in the slurry to meet the measurement conditions. The slurry overflows through the overflow baffle 10 to the medium outlet and is continuously discharged. At this time, the device has realized the function of real-time online continuous detection of slurry (liquid) medium.
[0012] Under normal circumstances, online pH meter 3 and online pH meter 2 are used simultaneously to detect pH values, and the average value of the two is taken as the real-time pH value. Lower limit values PHX, PHXX, PHS, and PHSS are set. The pH value of the circulating slurry should be controlled within the range of the lower limit PHXX and the upper limit PHSS. This is the most favorable condition for the continuous absorption, reaction, and oxidation of acidic pollutants and absorbent into byproducts in the flue gas of the wet desulfurization absorption tower system. When the real-time pH value is ≥ the upper limit PHS, the automatic absorbent addition valve is depressurized to reduce the absorbent flow rate, controlling the pH value to prevent it from rising above the upper limit PHSS. When the real-time pH value is ≤ the lower limit PHX, the automatic absorbent addition valve is depressurized to increase the absorbent flow rate, controlling the pH value to prevent it from falling below the lower limit PHXX.
[0013] When one of them needs maintenance or replacement, the other one will run independently.
[0014] For pipeline maintenance, flushing pipes and drain valves are designed: Medium inlet pipe 19 is equipped with inlet control valve 18 and flow rate control valve plate 34 and is connected to flushing pipe 20; medium inlet pipe 27 is equipped with inlet control valve 26 and flow rate control valve plate 35 and is connected to flushing pipe 28; flushing water control valve 21 is installed on flushing pipe 20, and flushing water control valve 29 is installed on flushing pipe 28. Dynamic measurement tanks 11 and 23 are connected to drain pipes 22 and 30 respectively; drain control valve 23 is installed on drain pipe 22, and drain control valve 31 is installed on drain pipe 30.
[0015] When any pH meter circuit requires manual surface cleaning or replacement maintenance, first close inlet control valve 18 or inlet control valve 26, then close outlet control valve 25 on medium outlet pipe 24 or outlet control valve 23 on medium outlet pipe 32, open vent control valve 23 or vent control valve 21, open flushing water control valve 21 or flushing water control valve 29 to flush and then close, after venting, close vent control valve 23 or vent control valve 21, then manually remove the corresponding pH meter flange 1, and then clean or replace the pH electrode. After completion, install the electrode and pH meter flange 1, and then open outlet control valve 25 or outlet control valve 23 and inlet control valve 18 or inlet control valve 26 in sequence to enter the working state.
Claims
1. A device for on-line detection of pH of desulfurization slurry, characterized in that, The system includes an outer cylinder located outside the desulfurization absorption tower. Inside the outer cylinder, a measuring tank partition separates a dynamic measuring tank 1 and a dynamic measuring tank 2. An online pH meter 1 extending into the dynamic measuring tank 1 and an online pH meter 2 extending into the dynamic measuring tank 2 are installed on the top of the outer cylinder. The medium outlet of the dynamic measuring tank 1 is connected to the desulfurization absorption tower via a medium outlet pipe 1, and the medium inlet is connected to a medium inlet pipe 1. The medium outlet of the dynamic measuring tank 2 is connected to the desulfurization absorption tower via a medium outlet pipe 2, and the medium inlet is connected to a medium inlet pipe 2. Both the medium inlet pipe 1 and the medium inlet pipe 2 are connected to a slurry circulation pipe. Overflow baffles are installed near the medium outlet in both the dynamic measuring tank 1 and the dynamic measuring tank 2.
2. The PH on-line detection device for desulfurization slurry according to claim 1, characterized in that, Both the first and second medium inlet pipes are equipped with inlet control valves and cut-off flow rate control valve plates and are connected to flushing pipes. A flushing water control valve is installed on the flushing pipes.
3. The PH on-line detection device for desulfurization slurry according to claim 1, characterized in that, The first dynamic measurement pool and the second dynamic measurement pool are respectively connected to the drain pipe.
4. The PH on-line detection device for desulfurization slurry according to claim 1, characterized in that, The top of the outer cylinder is equipped with a top cover plate, and a pH meter flange mounting seat is installed on the top cover plate by fasteners. Both the online pH meter one and the online pH meter two are installed on the pH meter flange mounting seat through pH meter flanges.