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Power generation device

A technology for generating devices and power, applied in safety devices, steam engine devices, engine components, etc., can solve problems such as contact and bearing damage, and achieve the effect of avoiding bad conditions

Active Publication Date: 2013-03-27
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to this reverse thrust, new problems such as surface contact between the upstream side (inlet side) end surface of the screw rotor constituting the screw turbine (14) and the housing opposite to the end surface, or bearing damage may occur.

Method used

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Examples

Experimental program
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Effect test

no. 1 Embodiment approach ）

[0042] figure 1 The structure of the power generator 1 which is the 1st Embodiment of the power generator of this invention is shown. The power generation device 1 is a Rankine cycle heat engine including a circulation flow path 6 including an evaporator 2 , a screw expander 3 , a condenser 4 , and a working medium pump 5 . A working medium (for example, a Freon-based heat medium such as R245fa) is sealed in the circulation flow path 6 .

[0043] The evaporator 2 is a heat exchanger for exchanging heat between a heating medium supplied from a heat source outside the device (for example, steam extracted from a pit or steam produced by a boiler) and a working medium to evaporate the working medium. The working medium evaporated in the evaporator 2 is introduced into the screw expander 3 through the circulation flow path 6 . In the screw expander 3 , a screw rotor (not shown) is driven to rotate by the expansion of the working medium. The operating medium discharged in a stat...

no. 2 Embodiment approach ）

[0065] Figure 4 A power generator 1a as a second embodiment of the power generator of the present invention is shown. In addition, in the description of the following embodiments, the same reference numerals are assigned to the same components as those of the above-described embodiments, and overlapping descriptions will be omitted.

[0066] In addition to the configuration of the power generating device 1 of the first embodiment, the power generating device 1 a of the second embodiment further includes a pressure sensor (evaporating pressure sensor) 21 provided in the flow path 6 a between the evaporator 2 and the on-off valve 15 . There is one difference, and other points have the same configuration as the above-mentioned power generating device 1 . The evaporation pressure sensor 21 is a member that detects the pressure of the working medium downstream of the evaporator 2 in the circulation flow path 6 , and the evaporation pressure in the evaporator 2 can be detected by ...

no. 3 Embodiment approach ）

[0075] Figure 7 A power generation device 1b that is a third embodiment of the power generation device of the present invention is shown.

[0076] The power generator 1b of the third embodiment has the same structure as the power generator 1a of the second embodiment in many respects, but it is different from the second embodiment in that a discharge pressure sensor 22 is provided in addition to the structure of the power generator 1a described above. different. The discharge pressure sensor 22 is provided in the flow path 6 b between the expander 3 and the condenser 4 in the circulation flow path 6 .

[0077] The calculation unit 20b of the controller 20 is configured as described later so that the pressure difference ΔP between the pressure Pv detected by the evaporation pressure sensor 21 and the pressure Pd detected by the discharge pressure sensor 22 becomes a predetermined value when the operation is stopped. When the value ΔPH is greater than or equal to ΔPH, the pre...

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Abstract

The invention provides a power generation device, which comprises an on-off valve; a pressure-sharing flow path, wherein in a circulation flow path, the part between the on-off valve and an evaporator is communicated with the part between a screw expander and a condenser; an expander bypass flow path, wherein in the circulation flow path, the part between the on-off valve and the screw expander is communicated with the part between the screw expander and the condenser; a controller used for turning off the on-off valve upon the shutdown of the device and then opening the bypass valve and the pressure-sharing valve of the expander after the shutdown of a pump action pump. In this way, after the stopping of the circulation of the action medium, the essential early stop of the power generation device is realized. Therefore, no inverse push force is exerted on the screw expander.

Description

technical field [0001] The present invention relates to power generating devices. Background technique [0002] As a power generation device that is a power generation device, flash evaporation that drives a generator by flash evaporation of water vapor has been widely introduced. However, in recent years, from the viewpoint of energy saving, there has been an increasing demand for a system capable of generating electricity at such low-temperature heat as cannot be utilized by flash evaporation in order to utilize it in waste heat recovery or the like. [0003] As such a power generation device, there is a binary power generation system that utilizes a Rankine cycle in which a working fluid is passed through an evaporator that transfers the working fluid to drive a turbine or an expander (expander) with a low-boiling-point working medium. , a turbine used to expand the operating fluid vapor, a condenser used to condense the operating fluid vapor, and a circulating pump used...

Claims

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Application Information

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IPC IPC(8): F01C13/00F01C20/06
CPCF01D17/10F01D21/00F01K13/02F01K25/10
Inventor 足立成人松村昌义成川裕高桥和雄
Owner KOBE STEEL LTD
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