CN-121976932-A - Energy recovery system and method

CN121976932ACN 121976932 ACN121976932 ACN 121976932ACN-121976932-A

Abstract

The invention discloses an energy recovery system and an energy recovery method, and relates to the technical field of sea water desalination energy recovery, wherein the energy recovery system comprises a rotary energy recovery device unit, a reciprocating switching type energy recovery device unit, a water hydraulic control unit and a testing and monitoring unit, wherein the rotary energy recovery device unit and the reciprocating switching type energy recovery device unit are connected in parallel through a high-pressure pipeline and a low-pressure pipeline to form a pressure energy transmission loop, the water hydraulic control unit is arranged at a key node of the loop, the fluid distribution proportion between the two device units is dynamically regulated through a cartridge valve group, and the testing and monitoring unit is used for collecting system pressure, flow and rotating speed parameters and controlling the action of the water hydraulic control unit through feedback signals to realize the cooperative operation of the rotary energy recovery device unit and the reciprocating switching type energy recovery device unit. The invention has the function of high-efficiency energy recovery under different flow conditions.

Inventors

FENG ZHONGMING
WANG HAIFENG
Lan zhe
LI BAOLONG
ZHENG ZHOU

Assignees

浙江方威检验检测技术有限公司

Dates

Publication Date: 20260505
Application Date: 20260129

Claims (10)

1. The energy recovery system is characterized by comprising a rotary energy recovery device unit, a reciprocating switching type energy recovery device unit, a water hydraulic control unit and a testing and monitoring unit, wherein the rotary energy recovery device unit and the reciprocating switching type energy recovery device unit are connected in parallel through a high-pressure pipeline and a low-pressure pipeline to form a pressure energy transmission loop, the water hydraulic control unit is arranged at a key node of the loop and dynamically adjusts the fluid distribution ratio between the two device units through a cartridge valve group, and the testing and monitoring unit is used for collecting system pressure, flow and rotating speed parameters and controlling the water hydraulic control unit to act through a feedback signal so as to realize the cooperative operation of the rotary energy recovery device unit and the reciprocating switching type energy recovery device unit.
2. The energy recovery system of claim 1, wherein the rotary energy recovery device unit comprises a rotor, an end cover, a sleeve and a sealing assembly, wherein the rotor is arranged in a closed space formed by the end cover and the sleeve, an inclined flow passage is arranged in the end cover, an axial flow passage is arranged on the outer wall of the rotor, and the sealing assembly is distributed at a matching position between the rotor and the end cover and between the sealing assembly and the sleeve.
3. The energy recovery system of claim 2, wherein the end cap is made of a corrosion resistant metal material, the inclination angle of the inclined flow passage in the end cap is adjustable and has at least two different working angles, and the rotor is integrally formed from a high-hardness ceramic material.
4. The energy recovery system of claim 3, wherein the seal assembly comprises a static seal structure and a dynamic seal structure, the static seal structure employs a rubber seal ring, and the dynamic seal structure employs a combined seal structure of a composite friction ring and an elastomer.
5. The energy recovery system according to claim 1, wherein the reciprocating switching type energy recovery device unit comprises a hydraulic cylinder, a reciprocating type switcher and a check valve, a high-pressure chamber and a low-pressure chamber are respectively arranged at two ends of the hydraulic cylinder, and the reciprocating type switcher drives a valve plate to reciprocate between two ends of the hydraulic cylinder through a power executing mechanism to realize flow direction switching of working media.
6. The energy recovery system according to claim 5, wherein the reciprocating switch comprises a valve body and a hydraulic drive actuator, wherein a high-pressure flow passage and a low-pressure flow passage which are isolated from each other are arranged in the valve body, and the hydraulic drive actuator synchronously controls the opening and closing states of a plurality of sealing valve plates in the valve body through a linkage mechanism.
7. The energy recovery system of claim 1, wherein the hydraulic control unit comprises a pilot control valve block, the pilot control valve block adopts a plug-in structure with a conical valve core and a flexible sealing element matched, and the valve block realizes valve opening adjustment through a balance relation between pressure difference and spring force.
8. The energy recovery system of claim 1, wherein the test and monitoring unit comprises a multi-parameter sensing network and a distributed data processing module, the sensing network comprises a pressure sensor, a flow sensor and a rotation speed sensor, and the data processing module adopts a programmable logic controller to realize real-time parameter acquisition and control instruction output.
9. The energy recovery system of claim 1, further comprising a raw seawater pretreatment module and a strong brine buffer module, wherein the pretreatment module is connected in series in the low pressure seawater inlet line, and the buffer module is connected in parallel in the high pressure strong brine outlet line, both of which are provided with a pressure stabilizing regulator.
10. A seawater desalination energy recovery method based on the recovery system of any one of claims 1-9 is characterized by comprising the following steps of alternately inputting high-pressure strong brine and low-pressure raw seawater into a rotary energy recovery device unit to conduct direct pressure transmission, starting a reciprocating switching type energy recovery device unit to conduct pressure increasing and releasing circulation when system flow fluctuation exceeds a threshold value, dynamically adjusting load distribution proportion of each device by a water hydraulic control unit according to real-time pressure parameters, continuously monitoring blending rate and leakage quantity indexes by a testing and monitoring unit, and triggering parameter self-adaptive correction.

Description

Energy recovery system and method Technical Field The invention relates to the technical field of sea water desalination energy recovery, in particular to an energy recovery system and method. Background Energy is a core resource for human survival and social development, and global energy consumption continues to rise with population growth, economic expansion and living standard improvement. The energy utilization rate of China is only about 40%, which is far lower than the international advanced level, and the energy waste not only increases the production cost, but also aggravates the environmental pollution. In industrial production, a large amount of high-pressure fluid is depressurized through a depressurization valve or directly discharged, and the pressure energy contained in the high-pressure fluid is not effectively utilized, so that serious energy loss is caused. With the increasing shortage of global fresh water resources, sea water desalination has become one of the important means for solving the problem of water supply in coastal areas. The main current sea water desalination technology is reverse osmosis, and the basic principle is that fresh water molecules in sea water penetrate a semipermeable membrane to enter a water producing side by applying pressure (usually 5.5-6.9 MPa) higher than sea water osmotic pressure, and salt and other impurities are intercepted and discharged on a concentrated water side. However, in this process, about 40% -50% of the feed seawater is discharged as high pressure brine, which still has a pressure close to the inlet end, and if released directly through a pressure relief valve, a significant amount of energy is wasted. According to measurement and calculation, more than 50% of the energy consumption per ton of fresh water production is consumed on the high-pressure pump, so how to efficiently recycle the pressure energy becomes the key for improving the energy efficiency of the system. In the prior art, mechanical equipment such as a turbine and a hydraulic motor is mainly used in the prior art of sea water desalination, and in recent years, a rotary pressure exchanger has become the main stream due to a compact structure and high recovery efficiency. The core thought of the technology is that the pressure transmission between the high-pressure fluid and the low-pressure fluid is realized through a single type of energy recovery device, and the energy recovery efficiency of a part of inlet rotary device can reach more than 94%. The prior art has the obvious defects that the single rotary device is poor in adaptability when the single rotary device is used for coping with system flow fluctuation, the energy recovery efficiency is easy to suddenly drop, the traditional mechanical equipment is large in size and complex in maintenance, the inlet rotary device is large in noise, the rotor is easy to clamp, the maintenance cost is high, the core technology depends on the inlet, meanwhile, the device is poor in cooperativity due to the lack of an accurate fluid distribution adjusting mechanism and a real-time monitoring feedback system, the whole energy recovery efficiency is difficult to further improve, the blending rate and the leakage quantity are not well controlled, and the high-efficiency energy recovery under different flow working conditions cannot be considered. Disclosure of Invention The application provides an energy recovery system and an energy recovery method, which have the function of high-efficiency energy recovery under different flow conditions. The application provides an energy recovery system and method, which adopts the following technical scheme: The system comprises a rotary energy recovery device unit, a reciprocating switching type energy recovery device unit, a water hydraulic control unit and a testing and monitoring unit, wherein the rotary energy recovery device unit and the reciprocating switching type energy recovery device unit are connected in parallel through a high-pressure pipeline and a low-pressure pipeline to form a pressure energy transmission loop, the water hydraulic control unit is arranged at a key node of the loop and dynamically adjusts the fluid distribution proportion between the two device units through a cartridge valve group, and the testing and monitoring unit collects system pressure, flow and rotating speed parameters and controls the water hydraulic control unit to act through a feedback signal so as to realize the cooperative operation of the rotary energy recovery device unit and the reciprocating switching type energy recovery device unit. Preferably, the rotary energy recovery device unit comprises a rotor, an end cover, a sleeve and a sealing assembly, wherein the rotor is arranged in a closed space formed by the end cover and the sleeve, an inclined flow passage is arranged in the end cover, an axial flow passage is arranged on the outer wall of the rotor, and the sealing assembly is distributed at