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Organic Rankine cycle waste heat recovery power generation system with separation and expansion device

An expansion device and waste heat recovery technology, which is applied in steam engine devices, machines/engines, mechanical equipment, etc., to reduce exhaust temperature, increase average heat absorption temperature, and improve heat exchange efficiency

Active Publication Date: 2015-04-15
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing technology does not consider that the exhausted steam after multi-stage expansion can enter the heat exchanger again for reheating, so that more high-temperature and high-pressure steam can be obtained, the average heat transfer temperature difference can be reduced, and the performance of the cycle can be further improved.

Method used

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  • Organic Rankine cycle waste heat recovery power generation system with separation and expansion device
  • Organic Rankine cycle waste heat recovery power generation system with separation and expansion device
  • Organic Rankine cycle waste heat recovery power generation system with separation and expansion device

Examples

Experimental program
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Effect test

Embodiment 1

[0034] refer to figure 1 and figure 2 , this embodiment is an organic Rankine cycle waste heat recovery power generation system with a first-stage separation expansion device, which is suitable for a waste heat source with a temperature of 150°C. Here, it is assumed that the flow rate of the waste heat source is 1kg / s; the organic working medium of the system is R245fa; the organic working medium fluid with a flow rate of 0.322kg / s is condensed to a saturated liquid at 30°C through the condenser C (the corresponding saturation pressure is 0.177MPa), pressurized to 0.758MPa by the total working medium booster pump P, and then passed through The preheater H is preheated to a two-phase state where the molar composition of the gas phase accounts for 0.31, and then separated into two streams of the primary gas phase flow V1 and the primary liquid phase flow L1 by the primary vapor-liquid separator S1; the primary liquid phase flow L1 is pressurized to 1.78MPa by the first-stage w...

Embodiment 2

[0036] refer to image 3 , the organic Rankine cycle waste heat recovery power generation system with a one-stage separation expansion device in this embodiment: the exhaust steam discharged from the low-temperature expander E enters the preheater H again to release heat to the organic working medium, and then condenses into a liquid through the condenser C ; The other parts of the system and the system cycle parameters are the same as in Example 1; the system is suitable for a waste heat source with a temperature of 150°C, assuming that the flow rate of the waste heat source is 1kg / s; the net output power of the system is 10.16kW, and the thermal efficiency is 13.77% .

Embodiment 3

[0038] refer to Figure 4 , this embodiment is an organic Rankine cycle waste heat recovery power generation system with a two-stage separation expansion device, which is suitable for a waste heat source with a temperature of 200°C. Here, it is assumed that the flow rate of the waste heat source is 1kg / s. The organic working fluid of the system is acetone; the organic working fluid with a flow rate of 0.1564kg / s is condensed to a saturated liquid at 30°C through the condenser C (the corresponding saturation pressure is 0.0365MPa), and pressurized by the total working fluid The pump P is pressurized to 0.4MPa, and then preheated by the preheater H to a two-phase state where the molar composition of the gas phase accounts for 0.3, and then separated into a primary gas phase flow V1 and a primary liquid phase flow L1 by the primary vapor-liquid separator S1 Two fluids; the primary liquid phase flow L1 is pressurized to 0.75MPa by the primary working fluid booster pump P1, heated ...

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Abstract

An organic Rankine cycle waste heat recovery power generation system with a separation and expansion device comprises a condensation system, a total working medium booster pump, a pre-heater, the separation and expansion device and a low-pressure expansion machine which are sequentially connected and form a circulation loop. Waste heat sequentially passes through the separation and expansion device and the pre-heater to be discharged into the environment. The separation and expansion device can be a primary device, a secondary device, tertiary device and a quaternary device. Condensed organic working medium liquid is heated to be in a two-phase state through the booster pump and the pre-heater and then enters the separation and expansion device to be separated and expanded, a working medium from the separation and expansion device enters the low-pressure expansion machine again to expand and do work externally, discharged dead steam is condensed to be liquid through a condenser, and one power circle is finished through the working medium booster pump. A waste heat source transmits heat to an organic working medium through the separation and expansion device and the pre-heater, and the heat is discharged into the environment after the temperature is reduced. The organic Rankine cycle waste heat recovery power generation system can reduce irreversible loss of the waste heat source and the organic working medium in the heat exchange process, has high heat efficiency and is suitable for recovery of middle and low waste heat sources.

Description

technical field [0001] The invention belongs to the field of power generation systems, in particular to an organic Rankine cycle waste heat recovery power generation system with a separation expansion device, which is mainly used for recycling medium and low temperature waste heat, and belongs to the field of energy saving and emission reduction. Background technique [0002] In recent years, fossil energy consumption and CO 2 , SO 2 , NO x The emissions of greenhouse gases and environmental pollutants, such as greenhouse gases, make countries around the world face serious environmental problems and energy crises. How to improve the comprehensive utilization efficiency of existing energy and recover low-grade energy has become one of the ways to solve the current problems. [0003] The amount of waste heat resources is large and wide, involving many industrial fields. According to incomplete statistics, the proportion of low-grade heat in the industrial field is quite la...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01K27/02
CPCY02P80/15
Inventor 公茂琼郭浩吴剑峰程逵炜
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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