Pickling system for percolate plate heat exchanger
By introducing a pH probe and an automatic control system in the data center into the plate heat exchanger, the problems of incomplete cleaning and complex operation of traditional cleaning methods are solved, an intelligent pickling process is realized, the cleaning effect and system stability are improved, and energy consumption and labor costs are reduced.
Patent Information
- Application Number
- CN202422586203.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-25
- Publication Date
- 2025-10-14
- Estimated Expiration
- 2034-10-25
AI Technical Summary
Traditional plate heat exchanger cleaning methods are not thorough, the operation process is cumbersome, and it is easy to cause equipment corrosion and shorten its life, and affect the normal operation of the production system.
A leachate plate heat exchanger pickling system was designed, which uses a pH probe and a data center for automatic control. By real-time monitoring of the sludge pH value, the pickling solution is accurately added, and combined with reasonable pipeline layout and equipment connection, intelligent cleaning is achieved.
It improves the cleaning effect and system stability, reduces the risk of manual operation errors, reduces energy consumption and labor costs, and ensures the safe and reliable operation of the system.
Smart Images
Figure CN223435504U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of environmental protection, in particular to a leachate plate heat exchanger pickling system. Background Art
[0002] The complex wastewater generated during the production process of waste incineration power plants contains high concentrations of pollutants such as organic matter, inorganic salts, and heavy metals. In leachate treatment systems, plate heat exchangers are key components of the AO (Anorexic / Oxide) process, providing heat exchange, nitrate return to the biochemical system, and replenishing the sludge concentration in the biochemical pool. However, after long-term operation, a difficult-to-remove scale layer easily forms on the surface of the heat exchanger plates, seriously affecting heat exchange efficiency and even leading to equipment clogging and corrosion.
[0003] Traditional methods for disassembling and cleaning heat exchangers often present numerous problems in practical applications. Their cleaning results are often unsatisfactory. Even after a long cleaning operation, the dirt on the heat exchanger fins is difficult to completely remove, which significantly affects the heat exchange efficiency of the fins and, in turn, reduces the performance of the entire heat exchange system. Furthermore, this traditional cleaning method is extremely complex, requiring professional technicians to perform a series of tedious steps, including disassembly, cleaning, and installation. This not only consumes a significant amount of time and labor costs, but is also prone to errors during operation, causing secondary damage to the equipment. Once secondary damage occurs to the equipment, it can shorten its service life, increase maintenance costs, and even affect the normal operation of the entire production system. Utility Model Content
[0004] In order to thoroughly solve the problems commonly found in current technologies, such as incomplete cleaning, cumbersome operation procedures, and possible equipment corrosion, the present invention proposes the following technical solutions:
[0005] A leachate plate heat exchanger pickling system comprises a membrane bioreactor system, a plate heat exchanger, and a controller, wherein the plate heat exchanger is respectively connected with a circulating water inlet pipe, a circulating water outlet pipe, a plate heat exchanger mud water inlet pipe, and a plate heat exchanger mud water outlet pipe; the circulating water inlet pipe is connected with the discharge port of the circulating water pump, the suction port of the circulating water pump is connected with a circulating water pool, and the circulating water pool is connected with the circulating water outlet pipe; the heat exchanger mud water inlet pipe is connected with the discharge port of the cooling sludge water pump, the cooling sludge water pump suction port is connected with the water outlet of the membrane bioreactor system, and the water inlet of the membrane bioreactor system is connected with the mud water outlet pipe of the plate heat exchanger; the heat exchanger mud water inlet pipe is provided with a branch pipe, the branch pipe is connected with the discharge port of the acid dosing water pump, and the suction port of the acid dosing water pump is connected with the acid storage tank.
[0006] Preferably, the acid storage tank stores pickling solution, and the acid storage tank is provided with a liquid level alarm.
[0007] Preferably, a pH probe is provided in the mud and water inlet pipe of the heat exchanger, and the pH probe and the acid dosing water pump are both connected to the data center.
[0008] Preferably, the pH probe detects and monitors the pH value of the pipeline sludge; when the pH value is ≥6.5, the data center controls the acid dosing water pump to start and introduces the pickling solution into the sludge inlet pipe of the heat exchanger; when the pH value is <6.5, the data center controls the acid dosing water pump to shut down.
[0009] Preferably, the data center is the controller.
[0010] Preferably, the circulating water outlet pipe is located above the circulating water pool.
[0011] Preferably, the mud and water outlet pipe of the plate heat exchanger is located above the water inlet of the membrane bioreactor system.
[0012] The beneficial effects of the utility model are:
[0013] 1. This utility model is equipped with a pH probe and a data center (controller), enabling highly intelligent automatic control. The pH probe monitors the pH value of the sludge in the heat exchanger's inlet pipe in real time. When the pH value reaches a preset threshold, the data center automatically activates and deactivates the acid dosing pump, precisely introducing the appropriate amount of pickling solution into the system. This intelligent control not only reduces the need for manual intervention and the risk of operational errors, but also dynamically adjusts the cleaning process based on actual conditions, ensuring effective cleaning while improving system stability and reliability.
[0014] 2. The acid storage tank of this utility model is equipped with a liquid level alarm, providing a key guarantee for the safe operation of the system. The liquid level alarm can promptly alert staff to the level of the pickling solution in the acid storage tank, avoiding safety accidents such as insufficient acid affecting the cleaning effect or leakage caused by excessive liquid level. At the same time, the system design fully considers various possible risk factors. Through reasonable piping layout and equipment connection, it ensures that the cleaning process will not cause harm to equipment and personnel, providing a safe and reliable guarantee for the leachate treatment process of waste incineration plants.
[0015] 3. In this utility model, the circulating water inlet pipe is connected to the discharge outlet of the circulating water pump, the circulating water pump's suction port is connected to the circulating water tank, and the circulating water tank is connected to the circulating water outlet pipe. This design allows the circulating water to circulate between the plate heat exchanger and the circulating water tank, significantly improving water resource utilization and reducing the demand for fresh water, in line with the development concept of energy conservation and environmental protection. Simultaneously, the cooling sludge water pump introduces water treated by the membrane bioreactor system into the sludge water inlet pipe of the plate heat exchanger, achieving rational use of water resources and reducing energy consumption of the entire system.
[0016] 4. The real-time monitoring function of this new pH probe allows operators to understand the system's operating status at all times. By accurately monitoring the pH value of pipeline sludge, abnormalities during the cleaning process can be promptly detected and adjustments can be made quickly. This real-time monitoring and adjustment capability not only improves cleaning effectiveness but also ensures safe and stable operation of the system, reducing production interruptions and losses caused by improper operation or equipment failure.
[0017] 5. This data center's intelligent control of equipment like the acid dosing pump reduces reliance on manual operation. Traditional cleaning methods typically require significant manpower, are cumbersome, and prone to errors. The system's intelligent control automatically completes key steps in the cleaning process, reducing labor costs while also improving operational accuracy and reliability. Staff only need to perform simple monitoring and maintenance to ensure the system's proper operation. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0019] Figure 1 This is a structural schematic diagram of a leachate plate heat exchanger pickling system of the utility model.
[0020] In the figure: 1. Data center; 2. Acid dosing pump; 3. pH probe; 4. Cooling sludge water pump; 5. Acid storage tank; 6. Heat exchanger sludge water inlet pipe; 7. Plate heat exchanger; 8. Circulating water inlet pipe; 9. Circulating water pump; 10. Circulating water tank; 11. Membrane Bio-Reactor (MBR) system; 12. Circulating water outlet pipe; 13. Plate heat exchanger sludge water outlet pipe. DETAILED DESCRIPTION
[0021] like Figure 1 As shown, an embodiment of the present invention provides a leachate plate heat exchanger pickling system, comprising an MBR system 11, a plate heat exchanger 7, and a controller. The plate heat exchanger 7 is connected to a circulating water inlet pipe 8, a circulating water outlet pipe 12, a plate heat exchanger mud water inlet pipe 6, and a plate heat exchanger mud water outlet pipe 13, respectively. The circulating water inlet pipe 8 is connected to the discharge port of a circulating water pump 9, the suction port of the circulating water pump 9 is connected to a circulating water tank 10, and the circulating water tank 10 is connected to the circulating water outlet pipe 12. The circulating water outlet pipe 12 is connected to the circulating water tank 10 and is located above the circulating water tank 10. The heat exchanger mud water inlet pipe 6 is connected to the discharge port of a cooling sludge water pump 4, the suction port of the cooling sludge water pump 4 is connected to the water outlet of the MBR system 11, and the water inlet of the MBR system 11 is connected to the plate heat exchanger mud water outlet pipe 13. The plate heat exchanger's muddy water outlet pipe 13 is connected to the water inlet of the MBR system 11 and is located above the water inlet of the MBR system 11. The heat exchanger's muddy water inlet pipe 6 is provided with a branch pipe, which is connected to the discharge outlet of the acid dosing water pump 2. The suction port of the acid dosing water pump 2 is connected to the acid storage tank 5. The acid storage tank 5 stores pickling solution. The acid storage tank 5 has a capacity of 10 tons and a liquid level of no less than 1.3m. The acid storage tank 5 is equipped with a liquid level detection alarm, which sounds an alarm when the liquid level in the acid storage tank 5 falls below 1.3m. A pH probe 3 is provided in the heat exchanger's muddy water inlet pipe 6. The pH probe 3 and the acid dosing water pump 2 are both connected to the data center 1, which serves as the controller. Preferably, the controller can be a PLC or DCS controller. The pH probe 3 detects and monitors the pH value of the pipeline sludge in real time; when the pH value is ≥6.5, the data center 1 controls the acid dosing water pump 2 to start and introduce the pickling solution into the sludge water inlet pipe 6 of the heat exchanger; when the pH value is <6.5, the data center 1 controls the acid dosing water pump 2 to shut down.
[0022] The working principle of the embodiment of the utility model is as follows:
[0023] The pH value of the pipeline sludge is monitored by the pH probe 3. When the pH value is ≥6.5 and the liquid level of the acid storage tank 5 is greater than 1.3m (the acid storage tank 5 is 10 tons, and an alarm is triggered when the liquid level is lower than 1.3m), the acid dosing water pump 2 is automatically started to add acid to the pipe; when the pH value is less than 6.5, the acid dosing water pump 2 stops adding acid.
[0024] Compared with the prior art, the embodiment of the present invention has the following advantages:
[0025] (1) Hardness refers to the total amount of metal ions such as lime, magnesium, calcium hydroxide, and magnesium hydroxide dissolved in water. Excessive hardness will affect the heat transfer effect of the plate heat exchanger and the subsequent life and treatment efficiency of the nanofiltration membrane group and reverse osmosis membrane group. For plate heat exchangers, the hardness of water cannot be too high, otherwise a scale layer will form on the surface of the plate, thereby affecting the heat transfer efficiency. The system of this embodiment can effectively prevent the scaling of the plate heat exchanger, while reducing the amount of acid added to the subsequent ultrafiltration clear liquid system, and can also prevent the scaling of nanofiltration membranes and reverse osmosis membranes (Note: For the leachate of the waste incineration plant, the pH of the MBR system effluent is generally 7.0, and the nanofiltration inlet process requires a pH less than 6.5, and the hardness is controlled below 2000 mg / l; the plate heat exchanger is designed according to the value. The pH range of the water used in the plate heat exchanger should be between 6.5 and 8.5 to avoid corrosion or damage to the plates in an overly acidic or overly alkaline environment. The hardness of the water should be controlled below 100 mg / L to prevent the formation of a scale layer on the plate surface. Taking all three conditions into consideration, it is most appropriate to control the pH at 6.5).
[0026] (2) It can effectively prevent secondary damage to the equipment. Compared with the traditional heat exchanger disassembly and cleaning method, the embodiment of the utility model can effectively prevent secondary damage to the plate heat exchanger during the disassembly process, and can also prevent corrosion from acidic chemicals.
[0027] (3) Environmental protection and energy saving: The pickling solution after cleaning is neutralized to meet the emission standards, reducing the impact on the environment.
[0028] (4)Automated control reduces energy consumption.
[0029] (5) Easy to operate: The entire cleaning process is automatically controlled, reducing manual operation and improving work efficiency.
[0030] The above content is a further detailed description of the present invention in conjunction with specific / preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, without departing from the concept of the present invention, they can also make several substitutions or modifications to these described embodiments, and these substitutions or modifications should be considered to belong to the scope of protection of the present invention. In the description of this specification, the reference terms "one embodiment", "some embodiments", "preferred embodiments", "examples", "specific examples" or "some examples" and the like mean that the specific features, structures, materials or characteristics described in conjunction 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 any one or more embodiments or examples in an appropriate manner. In the absence of mutual contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples. Although the embodiments of the present invention and their advantages have been described in detail, it should be understood that various changes, substitutions, and alterations can be made herein without departing from the scope of protection of the patent application.
Claims
1. A leachate plate heat exchanger pickling system, comprising a membrane bioreactor system (11), a plate heat exchanger (7), and a controller, characterized in that: The plate heat exchanger (7) is respectively connected to a circulating water inlet pipe (8), a circulating water outlet pipe (12), a plate heat exchanger mud water inlet pipe (6), and a plate heat exchanger mud water outlet pipe (13); The circulating water inlet pipe (8) is connected to the discharge port of the circulating water pump (9), the suction port of the circulating water pump (9) is connected to the circulating water pool (10), and the circulating water pool (10) is connected to the circulating water outlet pipe (12); The mud water inlet pipe (6) of the heat exchanger is connected to the discharge port of the cooling sludge water pump (4), the suction port of the cooling sludge water pump (4) is connected to the water outlet of the membrane bioreactor system (11), and the water inlet of the membrane bioreactor system (11) is connected to the mud water outlet pipe (13) of the plate heat exchanger; The heat exchanger mud water inlet pipe (6) is provided with a branch pipe, the branch pipe is connected to the discharge port of the acid dosing water pump (2), and the suction port of the acid dosing water pump (2) is connected to the acid storage tank (5).
2. A leachate plate heat exchanger pickling system according to claim 1, characterized in that: The acid storage tank (5) stores pickling solution, and a liquid level alarm is provided in the acid storage tank (5).
3. The leachate plate heat exchanger pickling system according to claim 1, characterized in that: A pH probe (3) is provided in the mud water inlet pipe (6) of the heat exchanger, and the pH probe (3) and the acid dosing water pump (2) are both connected to the data center (1).
4. A leachate plate heat exchanger pickling system according to claim 3, characterized in that: The pH probe (3) detects and monitors the pH value of the sludge in the pipeline; when the pH value is ≥6.5, the data center (1) controls the acid dosing water pump (2) to start and introduce the pickling solution into the sludge water inlet pipe (6) of the heat exchanger; when the pH value is <6.5, the data center (1) controls the acid dosing water pump (2) to shut down.
5. The leachate plate heat exchanger pickling system according to claim 3, characterized in that: The data center (1) is a controller.
6. The leachate plate heat exchanger pickling system according to claim 1, characterized in that: The circulating water outlet pipe (12) is located above the circulating water pool (10).
7. The leachate plate heat exchanger pickling system according to claim 1, characterized in that: The mud and water outlet pipe (13) of the plate heat exchanger is located above the water inlet end of the membrane bioreactor system (11).