CN-121976842-A - Deep well filling decompression and grading pressure energy recovery power generation system, energy efficiency monitoring method and operation control method

CN121976842ACN 121976842 ACN121976842 ACN 121976842ACN-121976842-A

Abstract

The invention belongs to the technical field of deep well mine filling and energy recovery intersection, and particularly relates to a deep well filling decompression and grading pressure energy recovery power generation system, an energy efficiency monitoring method and an operation control method, wherein the deep well filling decompression and grading pressure energy recovery power generation system comprises a ground surface filling preparation station, a filling vertical pipe, a decompression chamber, a primary coupling rotational flow driving device, a secondary coupling rotational flow driving device, a pressure stabilizing buffer tank and a terminal filling working surface; the surface filling preparation station conveys slurry into a pressure reducing chamber through a filling vertical pipe, the slurry is conveyed into a first-stage coupling rotational flow driving device in the pressure reducing chamber through pressure reduction, the first-stage coupling rotational flow driving device drives a first-stage permanent magnet generator to generate power, the slurry is conveyed to a second-stage coupling rotational flow driving device through a transition pipe after coming out of the first-stage coupling rotational flow driving device, the second-stage coupling rotational flow driving device drives a second-stage permanent magnet generator to generate power, and the slurry enters a pressure stabilizing buffer tank after coming out of the second-stage coupling rotational flow device and is conveyed to a terminal filling working surface through the pressure stabilizing buffer tank.

Inventors

HU XIAOGE
ZHOU YUAN
WANG RUIPENG
SUI XIN
CHEN CHEN
LI ZHENG
Diao Xiangri
ZHANG SHAOHE

Assignees

中冶沈勘秦皇岛工程设计研究总院有限公司

Dates

Publication Date: 20260505
Application Date: 20260331

Claims (6)

1. The deep well filling decompression and grading pressure energy recovery power generation system is characterized by comprising a ground surface filling preparation station, a filling vertical pipe, a pressure reducing chamber, a primary coupling rotational flow driving device, a secondary coupling rotational flow driving device, a pressure stabilizing buffer tank and a tail end filling working surface; The ground surface filling preparation station conveys slurry into the pressure reducing chamber through a filling vertical pipe, and the slurry is conveyed into the first-stage coupling rotational flow driving device in the pressure reducing chamber through pressure reduction, and the first-stage coupling rotational flow driving device drives the first-stage permanent magnet generator to generate power; the slurry enters a pressure stabilizing buffer tank after coming out of the secondary coupling cyclone device, and is then conveyed to a terminal filling working surface by the pressure stabilizing buffer tank.
2. The deep well filling decompression and grading pressure energy recovery power generation system according to claim 1, wherein a foldback type resistance-increasing decompression device is arranged in the pressure-reducing chamber.
3. The deep well filling decompression and grading pressure energy recovery power generation system according to claim 2, wherein the decompression cylinder wall in the foldback type resistance-increasing decompression device is lined with high-alumina ceramic and polyurethane composite lining board.
4. A deep well filling depressurization and staged pressure energy recovery power generation system in accordance with claim 3 wherein power from said primary permanent magnet generator and said secondary permanent magnet generator is incorporated into a downhole power network.
5. The method for monitoring the energy efficiency of the deep well filling decompression and grading pressure energy recovery power generation system is characterized by comprising the following steps of: S100, calculating the total energy of the filling slurry by the system, wherein the total energy E Total (S) of the slurry is the sum of potential energy E p and kinetic energy E K : ; ; Wherein, the Is slurry density, unit kg/m3; The unit is the gravity acceleration, m/s2; For conveying the height difference, the unit m; the unit is m3/s for the slurry flow; The unit s is the conveying time; is the slurry flow rate, unit m/s; S200, calculating friction energy loss of the pipeline, and quantifying friction loss in the slurry conveying process : ; Wherein: Is the coefficient of friction; The length of the pipeline is expressed as m; the diameter of the pipeline is the unit m; s300, describing the energy change of inlet and outlet slurry of the pressure reducing chamber based on Bernoulli equation: ; Wherein: The inlet and outlet pressures of the chamber are respectively shown in Pa; the flow rate of slurry at the inlet and outlet of the chamber is respectively in m/s; The heights of the inlets and outlets of the chambers are respectively the unit m; To reduce the energy loss of the pressure-reducing chamber (accounting for 5 to 8 percent of the total energy), unit J S400, calculating the recovery efficiency of the classified energy, wherein the recovery efficiency of the single-stage subunit and the total efficiency formula of the system are as follows: ; ; Wherein: For the number of hierarchical subunits.
6. An operation control method of a deep well filling decompression and grading pressure energy recovery power generation system is characterized by comprising the following steps: S100, establishing a linear state space model by taking slurry flow, pressure of an inlet of a pressure reducing chamber, rotation speed of a driving rotor in a primary coupling rotational flow driving device and a secondary coupling rotational flow driving device, guide vane angles and opening of a bleeder valve as control amounts; s200, taking the secondary error of the total recovery rate and the power grid demand power as a performance index, and adding an actuator increment penalty; S300, restraining upper and lower limits of the rotation speed of a driving rotor, the guide vane angle and the change rate of a leakage valve in the primary coupling rotational flow driving device and the secondary coupling rotational flow driving device; S400, coupling the nonlinearity of the processing model with constraint, embedding a real number coding genetic algorithm into a rolling optimization kernel to solve an optimal control sequence on line, starting an optimal solution in the last period, and combining an EKF (extended Kalman filter) real-time estimation state and disturbance compensation to realize the robust, efficient and low-abrasion operation of the deep well filling decompression and grading pressure energy recovery power generation system.

Description

Deep well filling decompression and grading pressure energy recovery power generation system, energy efficiency monitoring method and operation control method Technical Field The invention belongs to the technical field of deep well mine filling and energy recovery intersection, and particularly relates to a deep well filling decompression and grading pressure energy recovery power generation system, an energy efficiency monitoring method and an operation control method. Background With the rapid development of global economy, the demand for mineral resources continues to grow, and deep well mining has become an important trend in mining development. In the deep well exploitation process, the filling mining method is used as a key exploitation method, so that the earth pressure can be effectively controlled, the earth surface subsidence can be reduced, the recycling of solid wastes such as tailings can be realized, and the method has important significance for environmental protection and sustainable development of resources. However, the filling slurry in deep well filling needs to be conveyed from the ground to the underground, and the deep well filling slurry generally has the characteristics of high pressure (8-16 MPa), high drop (> 800 m) and high concentration (65-75%) due to the action of gravity difference, and the traditional filling system decompresses through a fixed throttle plate or a valve, so that the energy is totally dissipated into heat and noise, and the energy waste is caused. Moreover, the existing cyclone power generation device is only partially applied to a ground ore dressing loop, has core pain points such as low energy recovery efficiency, poor system coupling, lack of a grading recovery mechanism and the like, and is extremely easy to cause pipe blockage, pipe explosion and equipment abrasion failure. Moreover, the current research is focused on the research and development of a single technology or equipment, the comprehensive optimization and the integrated research of the whole deep well filling energy recovery system are lacked, and no decompression-grading energy recovery-filling integrated system is available at home and abroad. The above problems severely restrict the energy-saving and intelligent development of deep well filling technology, so that development of a high-efficiency, strong-coupling and good-adaptability hierarchical energy recovery power generation system and method is needed. In view of this, the present invention has been made. Disclosure of Invention The invention provides a deep well filling decompression and grading pressure energy recovery power generation system, an energy efficiency monitoring method and an operation control method. According to the invention, a concept of graded energy recovery is adopted according to the potential energy-kinetic energy gradient of the slurry, and a plurality of energy recovery units are designed according to the energy characteristics of the filling slurry in different conveying stages, so that the cascade utilization of energy is realized, the energy recovery efficiency is greatly improved, and the filling safety and the power generation stability are considered. In order to achieve the above purpose, the present invention provides the following technical solutions: a deep well filling decompression and grading pressure energy recovery power generation system comprises a ground surface filling preparation station, a filling vertical pipe, a decompression chamber, a primary coupling rotational flow driving device, a secondary coupling rotational flow driving device, a pressure stabilizing buffer tank and a tail end filling working surface; The ground surface filling preparation station conveys slurry into the pressure reducing chamber through a filling vertical pipe, and the slurry is conveyed into the first-stage coupling rotational flow driving device in the pressure reducing chamber through pressure reduction, and the first-stage coupling rotational flow driving device drives the first-stage permanent magnet generator to generate power; the slurry enters a pressure stabilizing buffer tank after coming out of the secondary coupling cyclone device, and is then conveyed to a terminal filling working surface by the pressure stabilizing buffer tank. Preferably, a foldback type resistance-increasing and pressure-reducing device is arranged in the pressure-reducing chamber. Preferably, the wall of the pressure reducing cylinder in the foldback type resistance-increasing pressure reducing device is lined with high-alumina ceramic and polyurethane composite lining plates. Preferably, the electricity generated by the primary permanent magnet generator and the secondary permanent magnet generator is incorporated into a downhole power network. The energy efficiency monitoring method of the deep well filling decompression and grading pressure energy recovery power generation system comprises the following steps: S100, calc