US-20260125992-A1 - HIGH-EFFICIENCY STEAM POWER CYCLE SYSTEM FOR CASCADED UTILIZATION OF ENERGY

Abstract

A high-efficiency steam power cycle system for cascaded utilization of energy includes a steam cycle system and an organic working fluid Rankine cycle system. The steam cycle system includes a steam generator, a steam turbine, a condenser, and a separation device. The separation device is provided with a first outlet and a second outlet. An outlet of the steam generator, the steam turbine, the condenser, an inlet of the separation device, the first outlet, and an inlet of the steam generator are sequentially connected. The organic working fluid Rankine cycle system includes a heat exchanger; the heat exchanger is provided with a water-based absorbent inlet and a water-based absorbent outlet. The water-based absorbent outlet, an inlet of the condenser, the inlet of the separation device, the second outlet, and the water-based absorbent inlet are sequentially connected.

Inventors

• Kelong Zhang
• Guangming CAO
• Lie Chen
• RUIQI WANG
• Zhaoxu CHEN
• Ziping Liu
• Hongkuan ZHOU
• Can Ma
• Wei Wang
• Zhiwu Ke
• Zhenxing Zhao
• Tao He
• Xiaohu Yang
• LU DAI
• Jinlan GOU

Assignees

• WUHAN SECOND SHIP DESIGN AND RESEARCH INSTITUTE

Dates

Publication Date

20260507

Application Date

20251023

Priority Date

20241106

Claims (10)

1. 1 . A high-efficiency steam power cycle system for cascaded utilization of energy, comprising: a steam cycle system and an organic working fluid Rankine cycle system; wherein the steam cycle system comprises a steam generator, a steam turbine, a condenser, and a separation device, the separation device is provided with a first outlet and a second outlet; and an outlet of the steam generator, the steam turbine, the condenser, an inlet of the separation device, the first outlet, and an inlet of the steam generator are sequentially connected; the organic working fluid Rankine cycle system comprises a heat exchanger, the heat exchanger is provided with a water-based absorbent inlet and a water-based absorbent outlet; and the water-based absorbent outlet, an inlet of the condenser, the inlet of the separation device, the second outlet, and the water-based absorbent inlet are sequentially connected; and the separation device is configured to separate a mixed liquid discharged from the condenser into water and a water-based absorbent solution; and the water flows to the steam generator through the first outlet, and the water-based absorbent solution flows to the heat exchanger through the second outlet.
2. 2 . The high-efficiency steam power cycle system for cascaded utilization of energy according to claim 1 , wherein an outlet of the condenser is connected to the water-based absorbent inlet.
3. 3 . The high-efficiency steam power cycle system for cascaded utilization of energy according to claim 2 , wherein the organic working fluid Rankine cycle system further comprises an expansion turbine, the heat exchanger is further provided with an organic working fluid inlet and an organic working fluid outlet, and the organic working fluid outlet, the expansion turbine, and the organic working fluid inlet are sequentially connected; and the expansion turbine is configured to convert thermal energy into mechanical energy or electrical energy.
4. 4 . The high-efficiency steam power cycle system for cascaded utilization of energy according to claim 3 , wherein the organic working fluid Rankine cycle system further comprises a cooler, an inlet of the cooler is connected to an outlet of the expansion turbine, and an outlet of the cooler is connected to the organic working fluid inlet.
5. 5 . The high-efficiency steam power cycle system for cascaded utilization of energy according to claim 4 , wherein the organic working fluid Rankine cycle system further comprises a first pumping member, and the first pumping member is disposed between the outlet of the cooler and the organic working fluid inlet.
6. 6 . The high-efficiency steam power cycle system for cascaded utilization of energy according to claim 1 , wherein the steam cycle system further comprises a second pumping member, and the second pumping member is disposed between the first outlet and the steam generator.
7. 7 . The high-efficiency steam power cycle system for cascaded utilization of energy according to claim 1 , wherein a regulating member is disposed between the outlet of the condenser and the water-based absorbent inlet or between the outlet of the condenser and the inlet of the separation device.
8. 8 . The high-efficiency steam power cycle system for cascaded utilization of energy according to claim 1 , wherein the steam cycle system further comprises a third pumping member, an inlet of the third pumping member is connected to the outlet of the condenser, and an outlet of the third pumping member is connected to the water-based absorbent inlet and the inlet of the separation device, respectively.
9. 9 . The high-efficiency steam power cycle system for cascaded utilization of energy according to claim 1 , wherein the water-based absorbent solution comprises a salt solution.
10. 10 . The high-efficiency steam power cycle system for cascaded utilization of energy according to claim 1 , wherein the separation device comprises a membrane distillation separation device.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priority to Chinese Patent Application No. 202411575070.X, filed on Nov. 6, 2024, which is incorporated herein by reference in its entirety. TECHNICAL FIELD The present disclosure relates to the technical field of energy and power engineering, and particularly relates to a high-efficiency steam power cycle system for cascaded utilization of energy. BACKGROUND In the technical field of energy and power engineering, the steam Rankine cycle system plays a crucial role. This system converts thermal energy into mechanical energy to provide power for industrial production or for power generation, and constitutes a core component of modern energy conversion technology. The basic operating principle of the steam Rankine cycle system involves using water as a working fluid. The water is heated in a boiler to generate steam, the steam expands through a steam turbine to perform work, is then exhausted into a condenser to be condensed back into water, and is finally pumped back to the boiler, forming a closed cycle. The thermal efficiency of the steam Rankine cycle system reflects the system's capability to convert thermal energy into mechanical energy and is a key indicator for measuring its performance. Existing steam Rankine cycle systems have low thermal efficiency, leading to substantial energy waste. SUMMARY The present disclosure provides a high-efficiency steam power cycle system for cascaded utilization of energy, aimed at solving the problem in the prior art where steam Rankine cycle systems have low thermal efficiency, leading to substantial energy waste. The present disclosure provides a high-efficiency steam power cycle system for cascaded utilization of energy, including: a steam cycle system and an organic working fluid Rankine cycle system; the steam cycle system includes a steam generator, a steam turbine, a condenser, and a separation device; the separation device is provided with a first outlet and a second outlet; an outlet of the steam generator, the steam turbine, the condenser, an inlet of the separation device, the first outlet, and an inlet of the steam generator are sequentially connected; the organic working fluid Rankine cycle system includes a heat exchanger; the heat exchanger is provided with a water-based absorbent inlet and a water-based absorbent outlet; the water-based absorbent outlet, an inlet of the condenser, the inlet of the separation device, the second outlet, and the water-based absorbent inlet are sequentially connected; the separation device is configured to separate a mixed liquid discharged from the condenser into water and a water-based absorbent solution; the water flows to the steam generator through the first outlet, and the water-based absorbent solution flows to the heat exchanger through the second outlet. According to the high-efficiency steam power cycle system for cascaded utilization of energy provided by the present disclosure, an outlet of the condenser is connected to the water-based absorbent inlet. According to the high-efficiency steam power cycle system for cascaded utilization of energy provided by the present disclosure, the organic working fluid Rankine cycle system further includes an expansion turbine, the heat exchanger is further provided with an organic working fluid inlet and an organic working fluid outlet, and the organic working fluid outlet, the expansion turbine, and the organic working fluid inlet are sequentially connected; and the expansion turbine is configured to convert thermal energy into mechanical energy or electrical energy. According to the high-efficiency steam power cycle system for cascaded utilization of energy provided by the present disclosure, the organic working fluid Rankine cycle system further includes a cooler, an inlet of the cooler is connected to an outlet of the expansion turbine, and an outlet of the cooler is connected to the organic working fluid inlet. According to the high-efficiency steam power cycle system for cascaded utilization of energy provided by the present disclosure, the organic working fluid Rankine cycle system further includes a first pumping member, and the first pumping member is disposed between the outlet of the cooler and the organic working fluid inlet. According to the high-efficiency steam power cycle system for cascaded utilization of energy provided by the present disclosure, the steam cycle system further includes a second pumping member, and the second pumping member is disposed between the first outlet and the steam generator. According to the high-efficiency steam power cycle system for cascaded utilization of energy provided by the present disclosure, a regulating member is disposed between the outlet of the condenser and the water-based absorbent inlet or between the outlet of the condenser and the inlet of the separation device. According to the high-efficiency steam power cycle system for cascaded utilization of ene