A single-valve expander system and method for isothermal expansion

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 on the exhaust holes, and achieves an increase in the output power per unit of working fluid. The effect of improving work efficiency and reducing the number of expansion stages

Active Publication Date: 2017-01-04
华科超能(北京)能源科技有限公司
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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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  • A single-valve expander system and method for isothermal expansion
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  • A single-valve expander system and method for isothermal expansion

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Embodiment 1

[0029] figure 1 It is a schematic structural 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 connecting rod mechanism. The piston 5 is slidably mounted in the cylinder 3. The crank connecting rod 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 an intake valve 2 and an annular injector 4 are installed on the top of the cylinder 3. The intake valve 2 is in communication with an external high-pressure gas working medium source, and the annular injector 4 is in communication with an external heating medium source system for heating medium Atomize or form foam and inject the cylinder 3 with a certain mass flow. An exhaust hole 8 is provided on the cylinder side wall near the bottom dead center of ...

Embodiment 2

[0031] figure 2 This is a schematic diagram of the structure of Embodiment 2 of the present invention. In the figure, 5 is a part of the piston body and is mainly the top part of the piston, and 7 is the top rod. This embodiment lists the shape of the top of the piston 5, which is 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 an inclined plane, and the angle between it and the plane is greater than 0 degrees. When the piston runs to the bottom dead center attachment, this structure facilitates timely discharge of the liquid accumulated on the piston surface to the exhaust buffer 内内。 In the cavity 9.

Embodiment 3

[0033] image 3 This is a schematic diagram of the structure of Embodiment 3 of the present invention, and its main structure is the same as that of Embodiment 1, except that the flow loop of the heating medium is given in this embodiment. The heating medium enters the expander cylinder 3 at ambient temperature, passes through the expansion process of the expander, and is discharged. The 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 pressurized by a liquid pump 16 and injected 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 point alkane or fluorocarbon is added to the heating medium Compound etc.

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Abstract

The invention relates to a single-valve expander system and method for isothermal expansion, which can be applied to small / miniature compressed air energy storage systems or other power systems, and realize quasi-isothermal expansion by spraying mist or foam medium into the gas in the expansion process process, thereby increasing the output power per unit of working fluid and improving the overall efficiency of the system. The specific method is that the top of the cylinder is equipped with an intake valve and an annular injector, the intake valve communicates with an external high-pressure gas working medium source, and the annular injector communicates with an external heating medium source system, during the working process of the expander , the heated heating medium is atomized or foamed and injected into the cylinder at a certain mass flow rate. Compared with the traditional single-valve expander, the present invention can make the expansion process obviously deviate from the adiabatic process, obtain a "quasi-isothermal expansion" process close to isothermal, and improve the output power per unit of working fluid and the working efficiency of the expander.

Description

Technical field [0001] The invention relates to a single valve expander system and method applicable to isothermal expansion of small / micro compressed air energy storage systems or other power systems. The expander can spray mist or foamy liquid into the gas during expansion Realize the quasi-isothermal expansion process, so as to realize the isothermal energy release, increase the output of the unit expansion working fluid, and improve the overall efficiency of the system. Background technique [0002] Expanders are widely used in various power output systems, such as steam power cycles, gas turbines, organic Rankine cycles, compressed air energy storage systems, etc. Isothermal expanders can obtain greater power output and higher system efficiency, and are increasingly attracting attention. The research field has initially involved isothermal diesel engines, isothermal compressed air energy storage systems, and piston compressor water injection evaporative internal cooling proc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01B29/10F01B31/00
Inventor 张新敬薛皓白陈海生徐玉杰谭春青
Owner 华科超能(北京)能源科技有限公司
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