Method for supercritical Rankine cycle recycling low-temperature waste heat power

A low-temperature waste heat and Rankine cycle technology, applied in the field of resources and environment, can solve the problems of unsatisfactory energy conversion efficiency and complex composition, and achieve the effects of improving the total utilization rate, increasing the total utilization rate, and expanding the temperature range.

Inactive Publication Date: 2008-11-05
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
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Problems solved by technology

Also aiming at the recovery of waste heat power in this temperature range, some scholars in the world have proposed the Kalina cycle using the mixture of ammonia and water as the circulating working medium. Energy conversion efficiency is not ideal
In general, the research on the use of organic Rankine cycle in low-temperature thermal energy conversion is still in its infancy.

Method used

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  • Method for supercritical Rankine cycle recycling low-temperature waste heat power

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Effect test

Embodiment 1

[0016] The displacement of 100°C hot water discharged by a smelter is 100t / h. Under the condition that the condensation temperature is set at 35°C, when the original R11 working fluid is used, the power output of 356Kw can be obtained, and the final discharge temperature of waste heat is 65°C; And adopt the technical solution of the present invention, promptly the proportioning of R290+R218 mixed working medium is 30% R290, when the evaporation pressure is 3.2Mpa, carry out the supercritical Rankine cycle of mixed working medium, then can obtain the power output of 509Kw, waste heat The final discharge temperature is 50°C, and the output power increases by 30.05%.

Embodiment 2

[0018] The outlet water temperature of a geothermal power generation production well is 95°C, and a 500Kw power station is built. Under the condition that the condensation temperature is set at 35°C, when R245fa is used as the working fluid, the groundwater extraction flow rate is 642.3t / h, and the geothermal flow is finally The discharge (or recharge) temperature is 88 DEG C; and adopt the technical scheme of the present invention, namely the proportioning of R290+R218 mixed working medium is 20% R290, when the evaporation pressure is 3.15Mpa, carry out the supercritical Lang of mixed working medium If the cycle is used, the groundwater extraction flow will be reduced to 136.4t / h, the final discharge (or recharge) temperature of the geothermal flow will be 62°C, and the groundwater extraction will drop by about 80%, which can greatly reduce the cost and initial investment of groundwater extraction.

Embodiment 3

[0020] The flue gas emission of a 350°C blast furnace in a smelter has been measured to be about 40,000kg / h. A 500Kw waste heat power station was originally built using F85. When the inlet temperature of the condenser is 25°C and the outlet temperature is 31.7°C, the evaporation pressure in the boiler is 49.2ata, 500Kw of power generation can be obtained, and the final exhaust temperature of the flue gas is 161°C; now the technical solution of the present invention is adopted, that is, the ratio of R290+R218 mixed working fluid is 10% R290, and the evaporation pressure is 4.0Mpa When the supercritical Rankine cycle of the mixed working fluid is carried out, the power generation power of 604KW can be obtained, the final discharge temperature of the flue gas is 118°C, the power generation power can be increased by 20%, and the final discharge temperature of the flue gas can be reduced by 43°C.

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Abstract

The present invention relates to a method of recovering low temperature energy power, especially aiming at the low temperature waste heat discharged in metallurgical industry, generation by solar energy temperature difference and resource utilization in bi-circular terrestrial heat generation, belonging to the technical field of resource and environment. The circular working substance of the present invention adopts duality mixed working substance configured by propane and octafluoropropane, directly heats to the supercritical state from the outlet of the compressing pump under the supercritical pressure, enters into the organic turbine to apply work, expands to the steam of the condensed pressure ensured by the condensing temperature, then condenses to liquid to the inlet of the compressing pump to be circularly used. The method is able to recover the available energy in the low temperature energy at a large extent and cause the final discharging temperature of the low temperature heat stream (or remaining heat stream) to reduce in the range permitted by the environment.

Description

technical field [0001] The invention relates to a method for power recovery of low-temperature thermal energy, especially for resource utilization of low-temperature waste heat discharged from metallurgical industry, solar thermoelectric power generation, and double-cycle geothermal power generation, and belongs to the field of resources and environment technology. Background technique [0002] In the process of industrial production, it is often accompanied by the discharge of a large amount of low-temperature waste heat. On the one hand, the discharge of waste heat reduces the efficiency of energy utilization, and at the same time causes thermal pollution to the environment. Therefore, the utilization of low-temperature waste heat should be comprehensively considered from two aspects: one is to maximize the use of waste heat, and the other is to reduce the final discharge temperature. At present, water is usually used as the working medium of the power cycle in my country,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01K25/06F01K25/10F01K27/02
CPCY02P80/15
Inventor 王华王辉涛王仕博黄晓艳
Owner KUNMING UNIV OF SCI & TECH
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