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Method and equipment for generating electricity and preparing fresh water by use of low-temperature heat source

A low-temperature heat source, fresh water technology, applied in mechanical equipment, hydropower, chemical instruments and methods, etc., can solve problems such as no practical prospect, reduction of flow rate improvement ratio, and reduction of power generation costs, so as to reduce power generation costs. , Improve the effect of increasing traffic and reducing operating costs

Inactive Publication Date: 2013-12-18
JIMEI UNIV
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Problems solved by technology

The advantage of this cycle is that the bulky steam turbine is replaced by a small water turbine, and the bulky surface condenser is replaced by direct spray condensation, so that the cost of power generation is expected to be reduced, but this cycle also cannot by-produce fresh water
At present, there are mainly the following problems in this cycle: First, if the flash temperature of saturated steam is low, the enthalpy drop of the steam will be small and the lifting height will be low; This fundamentally restricts the output power of the cycle; second, the efficiency of transferring the kinetic energy of the steam to the droplets by the friction between the two phases is very low; third, the saturated steam is easy to condense on the tube wall and cause precipitation , so that the flow lifting ratio is reduced, the lifting height is reduced, and the output power is reduced; Fourth, the hot water pump and the cooling water pump consume a lot of power. According to theoretical analysis, only when the actual lifting height is greater than 80m can there be net power output.
Due to the influence of the above factors, the current highest effective lifting height of the droplet lifting cycle is only 21m, which was obtained through experiments by the Guangzhou Institute of Energy Research, Chinese Academy of Sciences, so this cycle still has no prospect of practical application

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  • Method and equipment for generating electricity and preparing fresh water by use of low-temperature heat source

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Embodiment Construction

[0028] 1. Method

[0029] Such as figure 1 Shown, the present invention is a kind of method utilizing low-temperature heat source to generate electricity and prepare fresh water, and it comprises the following steps:

[0030] (1) The seawater is transported by the seawater pump 1 to the heater 2, heated by a low-temperature heat source with a temperature between 40 and 100°C, and then enters the flash evaporator 3; the hot seawater undergoes a depressurization flash process in the flash evaporator 3 to generate low-pressure saturated Steam enters superheater 4;

[0031] (2) The low-pressure saturated steam is further heated in the superheater 4 by a low-temperature heat source with a temperature between 80 and 200°C to generate low-pressure superheated steam and enter the mixing chamber 5; at the same time, the fresh water in the fresh water tank 13 is transported by the water hammer pump 14 to the atomizing nozzle 15, and then spray in the inner cavity of the mixing chamber...

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Abstract

The invention discloses a method and equipment for generating electricity and preparing fresh water by use of a low-temperature heat source. The equipment consists of a seawater pump, a heater, a flash evaporator, a superheater, a mixing chamber, an ascending pipe, a chimney, an air condenser, a water tank, a vacuum pump, a descending pipe, a water turbine generator set, a fresh water pool, a hydraulic ram and an atomization nozzle. In the invention, the seawater is subjected to the steps of heating, flash evaporation, superheating and the like to form low-pressure superheated steam; the superheated steam contacts in the mixing chamber, carries fogdrop, enters the ascending pipe and flows into the air condenser at the top of the chimney to be cooled into condensed water; the condensed water enters the water tank and flows downward through the descending pipe to flush the water turbine generator set to do work and generate electricity and then is stored in the fresh water pool; part of the fresh water is conveyed to the atomization nozzle by the hydraulic ram to be sprayed into the mixing chamber. The equipment disclosed by the invention can make full use of the low-temperature heat source to generate electricity, has the characteristics of high conversion efficiency, high net output power, low generating cost, abundant production of byproduct freshwater and the like, and can be widely applied to the technical field of low-temperature heat source utilization.

Description

technical field [0001] The invention belongs to the technical field of utilization of low-temperature heat sources, and in particular relates to a method and equipment for generating electricity and preparing fresh water by utilizing low-temperature heat sources. Background technique [0002] Low-temperature heat sources include air heat energy, soil heat energy, industrial waste heat, geothermal energy, solar energy, ocean temperature difference energy, etc. Exploring new technologies for the utilization of low-temperature heat sources is a long-awaited and urgently needed issue for scholars from all over the world. At present, the practical method of converting low-temperature heat energy into mechanical energy or electrical energy is still to achieve this conversion through a thermodynamic cycle, generally using a steam power cycle, mainly a Rankine cycle that works in the saturated steam region. The realization of the Rankine cycle can be divided into an open cycle using...

Claims

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Application Information

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IPC IPC(8): C02F1/06C02F1/14C02F1/16F03B13/06C02F103/08
CPCY02A20/212Y02E10/20Y02E60/16
Inventor 陈志强何宏舟蒋俊尧蔡佳莹张亮连荣清
Owner JIMEI UNIV
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