A low water head liquid-gas energy conversion device and design method

A conversion device and design method technology, applied in hydropower, mechanical equipment, greenhouse gas reduction, etc., can solve the problems of high efficiency and power, misunderstanding, etc.

Inactive Publication Date: 2015-12-02
CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It should be said that their method is very helpful in understanding the performance of hydrodynamic air pumps, but it can also be misleading, leading people to think that designing the siphon in this way will achieve higher efficiency
Howey and Pullen carried out preliminary experiments on one such siphon system, examining the difference between theoretical predictions and measured efficiencies, and the results showed that the efficiency and power predicted by French and Widden's model were higher

Method used

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  • A low water head liquid-gas energy conversion device and design method
  • A low water head liquid-gas energy conversion device and design method
  • A low water head liquid-gas energy conversion device and design method

Examples

Experimental program
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Embodiment 1

[0036] This embodiment is a low water head liquid-gas energy conversion device, such as figure 1 shown. The device described in this embodiment includes: an ascending pipe 1 installed on the side of the high water level of the weir 2, the ascending pipe is connected to the baffle pipe 3, and the descending pipe 1 on the low water level side of the weir is connected to the baffle pipe 3. The pipe 6 is connected, the ventilation point 4 is set on the down pipe, the suction pipe connected to the air turbine 5 is set on the air point, the air turbine is connected to the generator, and the ventilation point is on the down pipe The location is:

[0037] z A = z C + H + p C - p A ρg - [ L ...

Embodiment 2

[0045] This embodiment is an improvement of the first embodiment, and is a refinement of the first embodiment on the air turbine. The air turbine described in this embodiment is one of an axial flow turbine or a centripetal turbine.

[0046] The centripetal turbine described in this embodiment is relative to the traditional centrifugal turbine. In a traditional centrifugal turbine, the air flows first along the axial direction of the center of the turbine, and then turns on the surface of the turbine, in a centrifugal form, from the center of the turbine along the radial direction of the turbine, and flows out from the edge of the turbine. This flow pattern is due to the fact that the air flow with kinetic energy in a conventional turbine is concentrated instead of diffuse. However, in the air turbine described in this embodiment, the flow direction of the air with kinetic energy changes from dispersion to concentration. The flow of the air on the turbine surface is just the...

Embodiment 3

[0049] This embodiment is a design method of the low water head liquid-gas energy conversion device described in the above embodiments, and the steps of the method are as follows:

[0050] The step of calculating the porosity, pressure and cross-sectional average flow velocity of the upstream pipe water flow at the ventilation point: it is used to calculate the porosity, pressure and flow velocity of the ventilation point based on the efficiency η of maximizing the conversion of water energy into gas energy, and according to the maximum efficiency formula:

[0051] max { η ( p A , V 1 , α A ) } = max { k k - 1 p ...

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Abstract

The invention relates to a low-head liquid and gas energy conversion device and a method for designing the same. The low-head liquid and gas energy conversion device comprises an ascending tube. The ascending tube is mounted on a high water level side of a dam and is connected with a baffling tube, the baffling tube is connected with a descending tube on a low water level side of the dam, a ventilation point is arranged on the descending tube, an air suction tube connected with an air turbine is arranged at the ventilation point, and the air turbine is connected with a power generator. In the method for designing the low-head liquid and gas energy conversion device, the low-head liquid and gas energy conversion device is designed on the basis of maximum output of a system, and various constraint conditions are set, so that two essential parameters, namely, the height of the ventilation point and the cross section of a siphon tube, of the liquid and gas energy conversion device with the siphon tube are derived. The low-head liquid and gas energy conversion device and the method for designing the low-head liquid and gas energy conversion device have the advantages that the method is simple and practical as compared with the traditional method for designing a liquid and gas energy conversion device with a siphon tube; the liquid and gas energy conversion efficiency computed by a process in the method is close to the measured liquid and gas energy conversion efficiency, and accordingly practical application of the liquid and gas energy conversion device with the siphon tube is promoted theoretically; the maximum efficiency of the liquid and gas energy conversion device designed by the method can reach 86% as shown theoretically.

Description

technical field [0001] The present invention relates to a low water head liquid-gas energy conversion device and design method, which is an energy conversion device and design method, a device for converting low water head water flow energy into gas energy for power generation or water pumping and the optimization of the device design method. Background technique [0002] Hydropower is currently the only renewable energy that can be developed commercially on a large scale in the world. The technically exploitable amount of hydropower resources in the world is estimated to be 15,000TWh / year, but about half, that is, 6,000-9,000TWh / year, is currently considered uneconomical. A major reason is the low head and low power of these hydropower resources. Although the use of water turbines can convert water energy into electrical energy, the system efficiency can only reach about 40%, and the high investment cost of the installation unit often makes it uneconomical to build hydrop...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): F03B13/00F03B11/00
CPCY02E10/226Y02E10/20
Inventor杨开林郭新蕾付辉王涛郭永鑫李甲振董兴林谢省宗
OwnerCHINA INST OF WATER RESOURCES & HYDROPOWER RES