A cogeneration system of waste heat, electricity and water

A technology of electricity, water and waste heat, applied in general water supply conservation, seawater treatment, water/sewage treatment, etc., to achieve full utilization of heat energy and low thermal efficiency

Inactive Publication Date: 2016-08-24
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technical solution not only makes up for the problem of low thermal efficiency in the traditional low-temperature waste heat power generation system, but also recycles and utilizes the heat of the low-temperature exhaust steam at the outlet of the steam turbine to produce fresh water, realizes energy cascade utilization, and cogeneration of electricity and water

Method used

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  • A cogeneration system of waste heat, electricity and water
  • A cogeneration system of waste heat, electricity and water

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Embodiment 1

[0031] A set of porous media with an effective evaporation area of ​​50cm was developed in the laboratory 2 , The thermal conductive ribs and base and the evaporator shell are made of copper. The NaCl solution with a salt content of 17g / L is used to simulate "sea water", and the water-cooled condenser is used to condense fresh water vapor. Set the vertical height between the liquid level of the seawater storage tank and the brine storage tank and the top of the seawater chamber to be 9.5 meters and 10 meters respectively, and the vertical height between the liquid level of the fresh water storage tank and the condenser to be 10 meters. In the experiment, the electric heating rod was used to simulate the exhaust steam heat source at the outlet of the steam turbine, and the temperature of the heating rod, the temperature of seawater steam, the temperature of the inlet and outlet of the condenser and the ambient temperature were recorded by thermocouples.

[0032] In order to ach...

Embodiment 2

[0035] According to relevant data of "Exergy Analysis of R245fa Rankine Cycle Waste Heat Power Generation System" published by Luo Xianglong et al. in the Journal of Energy Saving Technology, the following working example of the system of the present invention is derived. When the steam waste heat in the factory is about 110°C, the steam flows into the heat exchanger to exchange heat with the working medium R245fa, and heats the R245fa into high-pressure steam. The high-pressure steam washes the turbine blades and drives the generator to generate electricity. At this time, the temperature of the steam is about 36°C after the steam turbine generates electricity, and the exhaust steam enters the seawater desalination evaporator, and exchanges heat with the seawater in the porous medium through the heat conduction fins to cool it into a liquid state, and the liquid R245fa is transported again under the action of the pump to the heat exchanger, and complete the entire low-temperatu...

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Abstract

The invention discloses a waste heat electricity-water coproduction system. The water heat electricity-water coproduction system comprises a low-temperature Rankine cycle power generation system and a steam exhaust seawater desalting system. An energy staircase-type utilization system for generating the electric power by utilizing the primary waste heat and desalting the seawater by utilizing the secondary waste heat can be realized by utilizing a great amount of exhaust steam and smoke discharged from enterprises such as iron and steel, cement and petroleum chemistry. The waste heat electricity-water coproduction system is characterized in that the low-temperature seawater desalting technology for establishing a vacuum environment by utilizing the water column height and sucking the seawater by utilizing the capillary force is combined with the low-temperature Rankine cycle power generation. In the seawater desalting system, the discharge of the concentrated salty water utilizes a siphon effect, and the seawater replenishment utilizes the capillary suction force, so that no additional pump power input is needed for operating the desalting system. According to the technical scheme, a seawater desalting evaporator is used for substituting the traditional Rankine circulating condenser, so that the Rankine circulation low-temperature exhaust steam is further recycled, not only is the electricity-water coproduction realized, but also the problem of the low heat efficiency in a waste heat power generation system can be solved, and energy conservation and emission reduction can be realized.

Description

technical field [0001] The invention relates to a cogeneration system of waste heat, electricity and water, belonging to the field of waste heat utilization and energy saving and emission reduction. Background technique [0002] Seawater desalination provides an unrestricted and stable freshwater replenishment pathway and is one of the most promising approaches to address the scarcity of natural freshwater resources. Whether it is thermal method or reverse osmosis, they all consume high-grade energy in exchange for fresh water, and they are dependent on electricity. For now, it is still an energy-intensive industry, and the increasingly tense energy problem is difficult to cope with the growing demand for fresh water. The volume of traditional seawater desalination equipment is too large, the initial investment is high, and the energy consumption is high. This has always been regarded as the main problem that seawater desalination is difficult to use in large quantities. R...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/16F01D15/10C02F103/08
CPCY02A20/124
Inventor 胡雪蛟章先涛洪子鑫
Owner WUHAN UNIV
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