CN-121976954-A - Percolate lifting pump system with multistage dynamic filtration and anti-blocking structure and control method

CN121976954ACN 121976954 ACN121976954 ACN 121976954ACN-121976954-A

Abstract

The invention provides a percolate lifting pump system with a multistage dynamic filtering and blocking-resisting structure and a control method, wherein the percolate lifting pump system comprises a reverse rotation cutting mechanism, a primary coarse filtering device, a forward crushing mechanism, a secondary precise filtering device, a vortex centrifugal separation device and a main driving unit which are sequentially arranged in the percolate lifting direction, the main driving unit drives a main pump impeller of the percolate lifting pump system and the forward crushing mechanism which is coaxially connected with the main pump impeller to rotate through a main pump motor, and the percolate lifting pump system also comprises a vibration monitoring module, a viscosity monitoring module arranged at an inlet of the main pump and a percolate channel, a pressure difference monitoring module arranged at each filtering device, a flow monitoring module arranged at an outlet of the main pump and a liquid level monitoring module arranged at a percolate collecting tank; the invention has bionic anti-blocking conveying structure, has screening and separating functions, and can realize efficient multistage dynamic filtration and crushing.

Inventors

LIN BINGCHENG
Cai Chengjie
GUO BIN
CHEN ZHILONG
YANG PENG

Assignees

厦门市政环能股份有限公司

Dates

Publication Date: 20260505
Application Date: 20260316

Claims (10)

1. The system is characterized by comprising a reverse rotation cutting mechanism, a primary coarse filtration device, a forward crushing mechanism, a secondary precise filtration device, a vortex centrifugal separation device and a main driving unit which are sequentially arranged in the direction of the lifting of the percolate, wherein the main driving unit drives a main pump impeller of the system and the forward crushing mechanism which is coaxially connected with the main pump impeller to rotate through a main pump motor, the system also comprises a vibration monitoring module arranged at a main pump bearing and the main pump motor, a viscosity monitoring module arranged at an inlet of the main pump and a position of a percolate channel, a pressure difference monitoring module arranged at each filtration device, a flow monitoring module arranged at an outlet of the main pump and a liquid level monitoring module arranged at a percolate collecting tank at the tail end of the percolate channel, and the vortex centrifugal separation device is used for driving the percolate to flow in a screening mode and separating solid matters and liquid matters of the percolate through centrifugal force when the percolate flows.
2. The system of claim 1, wherein the reverse rotation cutting mechanism is disposed at a forefront end of the system and comprises a reverse rotation blade set driven by a reverse rotation cutting motor and having a rotation direction opposite to a rotation direction of the main pump impeller, and is used for performing powerful cutting and preliminary crushing on large-size impurities in the permeate sucked into the system.
3. The system of claim 2, wherein the primary coarse filtration device is arranged at a percolate channel at the downstream of the anti-rotation cutting mechanism, comprises a coarse filter screen, and further comprises a primary anti-blocking cleaning blade of a reverse rotation blade group matched with the coarse filter screen and used for intercepting solid scraps still larger after preliminary crushing, wherein the primary anti-blocking cleaning blade is driven by a separate power source or is in linkage with the reverse rotation blade during working, and is matched with the coarse filter screen to continuously scrape the surface of the coarse filter screen to prevent blockage and push scraped impurities to a crushing area or a slag discharging port.
4. The system of claim 3, wherein the forward crushing mechanism is located at a percolate passage downstream of the primary coarse filtration device and comprises a forward rotating alloy crushing blade coaxially connected with the main pump impeller, and the main pump is operated to drive the forward rotating alloy crushing blade to rotate so as to secondarily crush impurities passing through the coarse filter screen.
5. The system of claim 4, wherein the secondary precise filtering device is positioned at the percolate channel downstream of the forward crushing mechanism and comprises a wedge-shaped filter screen and a secondary anti-blocking reverse blade matched with the wedge-shaped filter screen; The gap of the wedge-shaped filter screen is adjustable and is used for finely intercepting smaller particle impurities; The second-stage anti-blocking reverse blade is used for stripping impurities attached to the wedge-shaped filter screen to prevent the wedge-shaped filter screen from being blocked.
6. The multi-stage dynamic filtration and anti-clogging structure percolate lift pump system of claim 5, characterized by: the coarse filter screen and the wedge filter screen are cylindrical, the wedge filter screen is positioned on the inner side of the coarse filter screen to form a nested cylindrical structure, the upper end of the nested cylindrical structure is communicated with the inlet of the vortex centrifugal separation device, when the percolate lifting pump system works, percolate enters from the side wall of the nested cylindrical structure, and after being filtered by the coarse filter screen and the wedge filter screen, the percolate enters the vortex centrifugal separation device to be separated and screened.
7. The system of claim 6, wherein the rotary cutting path of the primary anti-blocking cleaning blade is positioned between the coarse filter screen and the wedge-shaped filter screen, the rotary cutting path of the forward rotary alloy crushing blade is positioned at the inner side of the coarse filter screen, and the rotary cutting path of the secondary anti-blocking reversing blade is positioned at the inner side of the wedge-shaped filter screen.
8. The system of claim 1, wherein the vortex centrifugal separator is located in the percolate channel downstream of the secondary precise filter, and comprises a vortex double-channel centrifugal cabin and a vane with a diversion function. When the vortex centrifugal separation device operates, solid matters in the percolate are separated from liquid by utilizing centrifugal force, and a percolate flow field is optimized by the flow guiding function of the double flow channels and the blades of the vortex double flow channel centrifugal cabin.
9. The system of claim 8, wherein the vortex centrifugal separator comprises an inner flow path in a central region and an outer flow path at a side wall of the vortex centrifugal separator, wherein when the vortex centrifugal separator drives the percolate to flow in a screening manner by the blades, the percolate rotates around the central region of the vortex centrifugal separator, A centrifugal cavity is arranged in a pump shell of the vortex centrifugal separation device and is radially divided into an inner flow channel and an outer flow channel by a flow separation structure: In the screening process, under the action of centrifugal force, solid matters in the percolate move to the external flow passage and are discharged from a slag discharge outlet through the external flow passage, and after the percolate in the central area of the vortex centrifugal separation device forms clear liquid, the clear liquid is discharged from a pump outlet of the lifting pump.
10. A method for controlling a percolate lifting pump system with a multistage dynamic filtration and anti-blocking structure, which uses the percolate lifting pump system with the multistage dynamic filtration and anti-blocking structure as set forth in claims 1, 2, 3, 4, 5, 6, 7, 8 and 9, characterized in that: the control method comprises the following steps: the method A, the two-stage anti-blocking reverse rotation blade executes reverse rotation in a specific period or according to a pressure difference signal output by the pressure difference monitoring module, peels off impurities attached to the wedge-shaped filter screen, and keeps the permeability of the wedge-shaped filter screen; The method B comprises the steps that a controller of a pump system monitors states of a pump and a motor bearing in real time through a vibration sensor of a vibration monitoring module, the controller analyzes frequency spectrums, and when a characteristic frequency indicating faults is identified, early warning is sent out; The method C, a controller of the pump system monitors the characteristic change of the medium through a viscosity sensor and a flowmeter of a flow monitoring module, and the controller dynamically adjusts the rotating speed of a main pump motor according to the characteristic change; The method D comprises the steps that a controller of a pump system continuously monitors pressure difference through pressure sensors arranged on the front and rear sides of a primary coarse filter screen and a secondary wedge filter screen through a pressure difference monitoring module, the controller judges the blocking degree of the filter screen according to the increasing rate and the absolute value of the pressure difference, and when the pressure difference rises to reach a preset threshold value or the blocking is predicted to be about to happen according to a control model of the controller, the automatic triggering operation comprises ① reinforcing the running strength or frequency of a counter-rotating cutting mechanism, an anti-blocking cleaning blade and an anti-blocking counter-rotating blade; the controller collects the differential pressure in real time, calculates the differential pressure delta P, and calculates the differential pressure increase rate k in a preset time window T; the controller judges the blockage degree and triggers the action based on the following rules: a) When Δp exceeds a first threshold Δp1_th, determining that the vehicle is lightly jammed and entering a reinforced cleaning mode; b) When deltaP exceeds a second threshold deltaP2_th or k continuously exceeds a threshold k_th for a preset number of times N, judging that the blocking degree is accelerated and triggering the secondary filter screen cleaning and/or the auxiliary action of the cutting mechanism; c) Executing deceleration, shutdown or alarm protection when Δp exceeds a protection threshold Δp3_th or abnormal vibration/flow jerk occurs; the method E, a controller of the pump system realizes automatic start-stop control of the pump through signal input of a liquid level meter at the percolate pool; and F, the controller of the pump system processes all sensor data in real time, and when serious abnormality occurs, a speed reduction or shutdown protection instruction is executed to prevent equipment from being damaged.

Description

Percolate lifting pump system with multistage dynamic filtration and anti-blocking structure and control method Technical Field The invention relates to the technical field of solid waste treatment, in particular to a percolate lifting pump system with a multistage dynamic filtering and anti-blocking structure and a control method thereof, in particular to a percolate conveying system for a garbage incineration power plant, and particularly relates to a percolate lifting conveying system containing high-concentration suspended matters, fibers and solid impurities and an intelligent control method thereof. Background The percolate lifting pump is core equipment of a percolate conveying system of the garbage incineration power plant and is used for conveying percolate containing high-concentration organic pollutants and suspended matters (such as plastic fragments, fibrous matters, dendritic sundries, dehydrated sludge lumps and the like) from a garbage pit bottom collecting pool to a factory treatment facility so as to regulate and control the liquid level of the pit, prevent corrosion and malodor dissipation of a pit body and ensure stable calorific value of garbage entering the furnace. The prior art mainly has the following defects: 1. The filtering efficiency is low and the filtering is easy to block, a single-layer plane filter screen (such as CN222641385U and CN 222650852U) is adopted in the main flow scheme, and mixed impurities with large scale difference (branches 5-30cm, fibers 10-50cm and sludge flocs 0.1-1 mm) and different forms (rigid fragments and flexible winding fibers) are difficult to effectively classify and intercept. Especially in rainy seasons or when the garbage components are complex, the blockage rate is high, so that the flow suddenly drops (for example, the flow is reduced from 50m3/h to 12m 3/h), frequent manual cleaning is needed, safety risks exist (the concentration of CO in a percolate pool is often more than 5000 ppm), and the maintenance is time-consuming (4-6 hours/time). 2. The pump body structure has poor blocking resistance, when a traditional closed centrifugal impeller (such as a conventional centrifugal pump and a screw pump) conveys long fibers (> 30cm and <2 mm), the fibers are easy to wind the impeller (form a fiber-impeller winding system) under the centrifugal force, so that the pump efficiency is rapidly reduced (such as 82% to 38%), the flow rate is rapidly attenuated (up to 15%/h), and the overload of a motor is possibly caused. 3. The intelligent degree is low, the existing system is only provided with a basic pressure gauge and a liquid level gauge (such as CN 213738998U) generally, and the on-line monitoring of key parameters (such as vibration, medium viscosity and fiber content) is lacked. The method cannot realize ① early warning of mechanical seal failure (72-120 hours before failure) based on vibration spectrum, ② dynamically adjusting rotation speed according to medium viscosity to optimize energy consumption (the energy consumption under a high-viscosity working condition can be increased by 40%), ③ predicting filter screen blocking trend, and relying on manual periodic inspection (for example, every 4 hours). 4. The energy efficiency level is low, and the running efficiency of the existing pump set is generally lower than the IE3 energy efficiency level (full load efficiency is more than or equal to 92%) required by the GB/T2331-2020 standard. Disclosure of Invention The invention provides a percolate lifting pump system with a multistage dynamic filtering and anti-blocking structure and a control method thereof, which are provided with a bionic anti-blocking conveying structure, have a screening and separating function, and can realize efficient multistage dynamic filtering and crushing. The invention adopts the following technical scheme. The system comprises a reverse rotation cutting mechanism, a primary coarse filtration device, a forward crushing mechanism, a secondary precise filtration device, a vortex centrifugal separation device and a main driving unit which are sequentially arranged in the direction of the lifting of the percolate, wherein the main driving unit drives a main pump impeller of the system and the forward crushing mechanism which is coaxially connected with the main pump impeller to rotate through a main pump motor, the system also comprises a vibration monitoring module arranged at a main pump bearing and the main pump motor, a viscosity monitoring module arranged at a main pump inlet and a percolate channel, a pressure difference monitoring module arranged at each filtration device, a flow monitoring module arranged at a main pump outlet and a liquid level monitoring module arranged at a percolate collecting tank at the tail end of the percolate channel, and the vortex centrifugal separation device is used for driving the percolate to flow in a screening mode and separating solid matters and liquid matters of the percolat