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Device for Improving the Efficiency of Rankine Cycle of Non-azeotropic Working Fluid Using Secondary Flow Mechanism

A technology of Rankine cycle and secondary flow, which is applied to steam engine devices, mechanical equipment, machines/engines, etc., can solve problems such as hindering the condensation of low-boiling point gases, increasing mass and heat transfer resistance, and increasing the temperature of the gas-liquid interface. The effect of overcoming mass transfer and heat transfer resistance, enhancing mixing, and reducing expansion ratio

Inactive Publication Date: 2015-12-30
SOUTHEAST UNIV
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Problems solved by technology

On the other hand, due to the increase of the proportion of high boiling point components on the surface of the liquid film, the temperature of the gas-liquid interface increases, and there is a temperature difference between the surface of the liquid film and the gas layer, so that part of the incoming heat will be consumed in the gas layer Sensible heat for additional heat transfer resistance
Therefore, the heat transfer of non-azeotropic mixtures will deteriorate due to the increase of mass transfer and heat transfer resistance in the process of evaporation and heat transfer.
Similarly, in the condenser, when the mixed working fluid releases heat at the wall surface, the high boiling point working medium tends to condense first, and forms a liquid boundary layer film, which hinders the condensation of low boiling point gases, resulting in the increase of mass and heat transfer resistance at the interface. heat transfer deterioration

Method used

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  • Device for Improving the Efficiency of Rankine Cycle of Non-azeotropic Working Fluid Using Secondary Flow Mechanism
  • Device for Improving the Efficiency of Rankine Cycle of Non-azeotropic Working Fluid Using Secondary Flow Mechanism
  • Device for Improving the Efficiency of Rankine Cycle of Non-azeotropic Working Fluid Using Secondary Flow Mechanism

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Embodiment Construction

[0028] Hereinafter, the present invention will be described in detail through specific embodiments in conjunction with the accompanying drawings.

[0029] The steam generator 1 in this circulation device adopts a single helical tube heat exchanger, the non-azeotropic mixed working medium is selected as two components, and the composition ratio of the refrigerant is R152a:R245fa is 0.3:0.7.

[0030] Such as figure 1 , as shown in 2, the present invention is a device for improving the efficiency of the non-azeotropic working medium Rankine cycle by using a secondary flow mechanism, including a steam generator 1, a single helical tube steam generator, an expander 2, and a generator 3 in this embodiment , a condenser 4, a liquid receiver 5, a working medium pump 6, a preheater 7, a three-way valve 8, and a control mechanism 9; the refrigerant outlet 1-d of the single helical tube steam generator is connected to the expander The inlet 2-a of the expander is connected; the first ou...

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Abstract

The invention discloses a device capable of adopting a secondary flow mechanism and improving the non-azeotropic working medium Rankine cycle efficiency. The device comprises a steam generator, an expansion mechanism, an electric generator, a condenser, a liquid accumulator, a working medium pump, a preheater and a control mechanism. The device solves the heat transfer deterioration problem generated in the evaporation heat transfer process of non-azeotropic mixed working media, and heating of high-pressure side working medium fluid is divided into two steps carried out by the preheater and an evaporator, and a plate type heat exchanger with the small resistance loss and high heat exchange coefficients is adopted by the preheater and is used for removing supercooling of the working media. The optimized-design secondary flow mechanism is adopted by the evaporator, the disturbance and mixing action is introduced, the heat transfer mass transfer resistance added by the non-azeotropic working media is overcome, and the cycle efficiency is improved. The device is widely applied to efficient utilization of medium and low temperature heat energy, the medium and low temperature heat energy can be efficiently converted into mechanical energy and electric energy, and waste heat utilization of renewable energy sources is promoted.

Description

technical field [0001] The invention relates to the field of high-efficiency utilization of medium and low temperature heat energy, in particular to a device for improving the efficiency of a non-azeotropic working medium Rankine cycle by adopting a secondary flow mechanism. Background technique [0002] With the increasing shortage of renewable energy, the development and utilization of new energy is becoming increasingly important. The organic Rankine cycle power generation that uses medium and low temperature solar energy, geothermal energy, biomass energy and waste heat in industrial production as driving heat energy is the solution to this problem. One of the effective ways to solve a problem. But at present, the actual power generation efficiency of the organic Rankine cycle system studied at home and abroad is not very high, and its energy loss mainly comes from the expander and heat exchanger. For a certain fixed expander, its irreversible loss depends not only on i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01K25/10F01K27/00
Inventor 陈九法刘玉兰曹政
Owner SOUTHEAST UNIV
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