Single valve expander system capable of realizing isothermal expansion and method

An isothermal expansion and expander technology, applied in mechanical equipment, engine components, machines/engines, etc., can solve problems such as affecting the normal operation of the machine, increasing costs, and frosting of the exhaust holes, and achieves the improvement of output power per unit of working fluid, The effect of reducing the number of expansion stages and improving the overall efficiency

Active Publication Date: 2015-02-18
中储国能(北京)技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Practice has proved that the effect of using water or air to heat the expansion gas outside the cylinder wall is not obvious, which leads to the actual expansion process close to adiabatic expansion, which not only reduces the system efficiency of the expander, but also easily causes frost in the vent hole, affecting normal operation of the machine
However, the multi-stage expansion and inter-stage heating operation mode often used in industry will inevitably lead to complex system structure, increased cost and increased additional power consumption.

Method used

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  • Single valve expander system capable of realizing isothermal expansion and method
  • Single valve expander system capable of realizing isothermal expansion and method
  • Single valve expander system capable of realizing isothermal expansion and method

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Embodiment 1

[0029] figure 1It is a structural schematic diagram of Embodiment 1 of the isothermal expansion single-valve expander system and method of the present invention. The single-valve isothermal expander includes a piston 5, a cylinder 3 and a crank-link mechanism. The piston 5 is slidably installed in the cylinder 3. The crank-link mechanism includes a connecting rod 12 and a crank 13. One end of the connecting rod 12 is connected to the piston 5, and the other end is connected to the The crank 13 is connected, and the intake valve 2 and the annular injector 4 are installed on the top of the cylinder 3. The intake valve 2 communicates with the external high-pressure gas working medium source, and the annular injector 4 communicates with the external heating medium source system, which is used to transfer the heating medium Atomize or form foam and inject into cylinder 3 with a certain mass flow. An exhaust hole 8 is provided on the side wall of the cylinder near the bottom dead c...

Embodiment 2

[0031] figure 2 It is a structural schematic diagram of embodiment 2 of the present invention, in the figure 5 is a part of the piston body, and mainly the top part of the piston, 7 is the ejector rod, the present embodiment has listed the shape of the top of the piston 5, given in embodiment 1 The top of the piston is flat. Such as figure 2 As shown, the top of the piston can also be a slope, and the angle between it and the plane is greater than 0 degrees. When the piston runs to the bottom dead center, this structure facilitates the timely discharge of the liquid accumulated on the piston surface to the exhaust buffer. Inside cavity 9.

Embodiment 3

[0033] image 3 It is a schematic structural diagram of Embodiment 3 of the present invention, and its main structure is the same as that of Embodiment 1. The difference is that the flow loop of the heating medium is given in this embodiment. The heating medium enters the expander cylinder 3 at ambient temperature, goes through the expansion process of the expander, and is discharged, and its temperature drops, and the discharged heating medium enters the liquid tank 14, and then passes through an air cooler 15, where the ambient temperature is used to heat the fluid medium , and then pressurize through a liquid pump 16, and inject it into the cylinder again. It should be noted that Embodiment 2 can also be used in this embodiment; if the heating medium is sprayed into the cylinder in the form of foam, a special additive such as propylene glycol, low-boiling alkanes or fluorocarbons has been added to the heating medium compounds etc.

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Abstract

The invention relates to a single valve expander system capable of realizing isothermal expansion and a method. The single valve expander system can be applied to a small-sized/micro compressed air energy storage system or other power systems; a quasi isothermal expansion process is realized by ejecting vaporous or foamy mediums into gas in the expansion process, so that the output work of unit working mediums is improved, and the overall efficiency of the system is improved. Specifically, the single valve expander system is characterized in that an air inlet valve and an annular ejector are mounted at the top of an air cylinder, the air inlet valve is communicated with an external high-pressure gas working medium source, and the annular ejector is communicated with an external heating medium source system; in the working process of an expander, heated heating mediums are atomized or form foam and are fed into the air cylinder at a certain mass flow rate. Compared with a traditional single valve expander, the single valve expander system has the benefits that the expansion process can obviously deviate from an adiabatic process, the quasi isothermal expansion process close to the isothermal temperature is obtained, and the output work of the unit working mediums and the working efficiency of the expander are improved.

Description

technical field [0001] The present invention relates to a single-valve expander system and method applicable to isothermal expansion of small / miniature compressed air energy storage systems or other power systems. The expander can spray mist or foamy liquid into the gas in the expansion process Realize the quasi-isothermal expansion process, thereby realizing isothermal energy release, increasing the work output per unit of expansion working medium, and improving the overall efficiency of the system. Background technique [0002] Expanders are widely used in various power output systems, such as steam power cycle, gas turbine, organic Rankine cycle, compressed air energy storage system, etc. The isothermal expander can obtain greater output power and higher system efficiency, which has attracted people's attention day by day. The research field has initially involved the fields of isothermal diesel engine, isothermal compressed air energy storage system and water spray evapo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01B29/10F01B31/00
CPCF01B29/10F01B31/00
Inventor 张新敬薛皓白陈海生徐玉杰谭春青
Owner 中储国能(北京)技术有限公司
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