CN-121990647-A - Gas engine driven multifunctional coupling sea water desalination and power generation system

CN121990647ACN 121990647 ACN121990647 ACN 121990647ACN-121990647-A

Abstract

The invention relates to the technical field of sea water desalination and power generation, and discloses a gas engine driven multifunctional coupling sea water desalination and power generation system, which comprises a refrigerant circulation unit, a power generation unit and a power generation unit, wherein the refrigerant circulation unit comprises a compressor, a condenser and an evaporator which are connected with each other; the gas engine driving unit comprises a gas engine, a cylinder sleeve heat exchanger and a flue gas heat exchanger, wherein the gas engine is connected with a compressor, the cylinder sleeve heat exchanger and the flue gas heat exchanger are respectively connected with the gas engine, the membrane distillation unit comprises a seawater storage tank, a membrane assembly, a concentrated solution storage tank and a condensed water tank, the seawater storage tank is connected with the membrane assembly through a condenser, the membrane assembly is connected with the concentrated solution storage tank through an evaporator, the membrane assembly is connected with the condensed water tank, and the reverse electrodialysis galvanic pile unit comprises a reverse electrodialysis galvanic pile, a user and a waste liquid tank, and the reverse electrodialysis galvanic pile is respectively connected with the user and the waste liquid tank. The invention improves the sea water desalination and power generation efficiency through multi-energy coupling and waste heat cascade utilization.

Inventors

DONG FUJIANG
LIU CHUHAN
Li Hepu
LI XUELI

Assignees

烟台大学

Dates

Publication Date: 20260508
Application Date: 20260319

Claims (9)

1. A gas engine driven multi-energy coupled desalination and power generation system comprising: a refrigerant circulation unit including a compressor, a condenser, an expansion valve, and an evaporator connected to each other; The gas engine driving unit comprises a gas engine, a cylinder sleeve heat exchanger and a smoke heat exchanger, wherein the gas engine is connected with the compressor, and the cylinder sleeve heat exchanger and the smoke heat exchanger are respectively connected with the gas engine; the membrane distillation unit comprises a seawater storage tank, a membrane assembly, a concentrated solution storage tank and a condensed water tank, wherein the seawater storage tank is connected with the membrane assembly through a condenser, the membrane assembly is connected with the concentrated solution storage tank, and the membrane assembly is also respectively connected with the evaporator and the condensed water tank; The reverse electrodialysis galvanic pile unit comprises a reverse electrodialysis galvanic pile, a user and a waste liquid tank, wherein the reverse electrodialysis galvanic pile is connected with the membrane assembly through a concentrated solution storage tank, and the reverse electrodialysis galvanic pile is respectively connected with the user and the waste liquid tank.
2. The gas turbine driven multi-energy coupled seawater desalination and power generation system of claim 1, wherein the condenser comprises a condenser tube and a condenser shell, and the evaporator comprises an evaporator tube and an evaporator shell; the outlet of the compressor is connected with the inlet of the condensing pipe, the outlet of the condensing pipe is connected with the inlet of the evaporating pipe through the expansion valve, and the outlet of the evaporating pipe is connected with the inlet of the compressor; The refrigerant vapor with low temperature and low pressure enters the compressor and is compressed into high temperature and high pressure superheated vapor, the high temperature and high pressure superheated vapor enters the condensing pipe of the condenser and is condensed into refrigerant liquid with high pressure and normal temperature after heat release, the refrigerant liquid flows through the expansion valve, is throttled and depressurized and becomes a low temperature and low pressure gas-liquid mixture, the gas-liquid mixture enters the evaporating pipe of the evaporator and becomes low temperature and low pressure refrigerant vapor again after heat absorption and evaporation, and the refrigerant vapor returns to the compressor to complete one-time refrigerant cycle and cycle reciprocation.
3. The gas turbine driven multi-energy coupled seawater desalination and power generation system of claim 2, wherein the gas engine is coupled to the compressor, the gas engine for driving the compressor in operation; The cylinder sleeve heat exchanger comprises an outer cylinder sleeve and an inner cylinder sleeve, and the flue gas heat exchanger comprises a flue gas liner and a heat exchanger shell; The inner cylinder sleeve is arranged in the gas engine, the inlet of the outer cylinder sleeve is connected with the outlet of the condensing shell, the outlet of the outer cylinder sleeve is connected with the inlet of the heat exchanger shell, the outlet of the heat exchanger shell is connected with the inlet of the membrane component, the flue gas outlet of the gas engine is connected with the inlet of the flue gas liner, and the outlet of the flue gas liner is connected with the outside.
4. A gas turbine driven multi-energy coupled seawater desalination and power generation system as claimed in claim 3, wherein the membrane distillation unit further comprises a seawater pump, the seawater storage tank inlet is connected to a source of pretreated seawater, the seawater storage tank outlet is connected to the seawater pump inlet, and the seawater pump outlet is connected to the condensing shell inlet.
5. The gas turbine-driven multi-energy coupled seawater desalination and power generation system of claim 4, wherein the membrane distillation unit further comprises a condensate pump and a fresh water storage tank; The concentrated solution outlet of the membrane component is connected with the concentrated solution storage tank inlet, the fresh water outlet of the membrane component is connected with the condensed water tank inlet through an auxiliary cooler, the condensed water tank outlet is connected with the condensed water pump inlet, and the condensed water pump outlet is connected with the fresh water storage tank inlet.
6. The gas turbine driven multi-energy coupled seawater desalination and power generation system of claim 5, wherein the membrane distillation unit further comprises a fresh water storage tank connected to the condensate tank.
7. The gas turbine driven multi-energy coupled seawater desalination and power generation system of claim 6, wherein the reverse electrodialysis stack inlet is connected to a source of pretreated seawater, and the reverse electrodialysis stack outlet is connected to the waste tank inlet.
8. The gas turbine driven multi-energy coupled seawater desalination and power generation system of claim 7, wherein the reverse electrodialysis stack inlet is further connected to the concentrate tank outlet via a concentrate pump.
9. The gas turbine driven multi-energy coupled desalination and power generation system of claim 8 wherein the power generation side of the reverse electrodialysis stack is connected to a user.

Description

Gas engine driven multifunctional coupling sea water desalination and power generation system Technical Field The invention relates to the technical field of sea water desalination and power generation, in particular to a gas engine driven multi-energy coupling sea water desalination and power generation system. Background With the increasing shortage of global fresh water resources, sea water desalination technology is receiving a great deal of attention as an important means for alleviating the crisis of water resources. The traditional sea water desalination method such as Reverse Osmosis (RO), multistage flash evaporation (MSF), multi-effect distillation (MED) and the like generally has the problems of high energy consumption, high operation cost, obvious influence on the environment and the like. Meanwhile, the coupling development of efficient clean utilization of fossil energy and renewable energy is a new trend of energy system development. In recent years, membrane Distillation (MD) is a novel heat driven seawater desalination technology, and is gradually becoming a research hot spot due to the advantages of low requirements on the quality of inlet water, high purity of produced water and the like, and the membrane distillation can be operated at a lower temperature. However, the membrane distillation process still requires stable heat source supply, and the energy efficiency is low when the membrane distillation process is operated alone, so that large-scale application is difficult to realize. The existing membrane distillation system usually only focuses on the heat source supply problem, and the condensation side cold energy recovery and cold and heat cooperative reinforcement mechanism are not fully considered, so that the overall energy utilization efficiency of the system is limited. In addition, the strong brine is used as a sea water desalination byproduct, and if the strong brine is directly discharged, not only is the resource wasted, but also ecological problems can be caused. On the other hand, when the gas engine is used as a high-efficiency internal combustion power device, the cylinder liner cooling water and the high-temperature flue gas contain a large amount of medium-low temperature waste heat while generating electricity or driving a compressor, and if the gas engine is not effectively recycled, energy waste is caused. Most of the existing waste heat utilization modes are single-stage heat exchange or simple heat supply modes, deep coupling is not formed with the sea water desalination process, and a multi-stage cascade utilization structure is not constructed. The Reverse Electrodialysis (RED) technology can utilize the salinity difference between the strong brine and the fresh water to generate electric energy, and provides a new path for the resource utilization of the strong brine. However, in the prior art, the reverse electrodialysis exists as an independent power generation module, and a system-level cooperative design is lacked between the reverse electrodialysis and the heat driven desalination system. Therefore, a multi-energy coupling system integrating gas engine driving, refrigeration cycle, membrane distillation and reverse electrodialysis power generation is needed, and integrated cooperation of energy cascade utilization, efficient seawater desalination and strong brine resource power generation is realized. Disclosure of Invention The invention aims to provide a gas engine driven multi-energy coupling sea water desalination and power generation system, which aims to solve the problems and realize energy cascade utilization, sea water high-efficiency desalination and strong brine resource power generation. The invention provides a gas engine driven multifunctional coupling sea water desalination and power generation system, which comprises: a refrigerant circulation unit including a compressor, a condenser, an expansion valve, and an evaporator connected to each other; The gas engine driving unit comprises a gas engine, a cylinder sleeve heat exchanger and a smoke heat exchanger, wherein the gas engine is connected with the compressor, and the cylinder sleeve heat exchanger and the smoke heat exchanger are respectively connected with the gas engine; the membrane distillation unit comprises a seawater storage tank, a membrane assembly, a concentrated solution storage tank and a condensed water tank, wherein the seawater storage tank is connected with the membrane assembly through a condenser, the membrane assembly is connected with the concentrated solution storage tank, and the membrane assembly is also respectively connected with the evaporator and the condensed water tank; The reverse electrodialysis galvanic pile unit comprises a reverse electrodialysis galvanic pile, a user and a waste liquid tank, wherein the reverse electrodialysis galvanic pile is connected with the membrane assembly through a concentrated solution storage tank, and the reverse electrodia