Smoke moisture and waste heat recovery device based on hollow micro-nano porous ceramic membranes

Abstract

The invention belongs to the technical field of energy conservation of thermal power plants, and particularly relates to a smoke moisture and waste heat recovery device based on hollow micro-nano porous ceramic membranes. The smoke moisture and waste heat recovery device is applied to smoke moisture and waste heat recovery before discharged smoke of a thermal power plant enters a flue; and the device mainly comprises the following systems: a hollow micro-nano porous ceramic membrane component system, a water supply system (which mainly comprises a water tank and a water pump) and an auxiliary system (which mainly comprises a valve, a pipeline and a sensor). According to the device, hollow micro-nano porous ceramic membrane pipes are fully filled with cooling water by utilizing the water supply system, and micro-negative pressure is formed on the inner sides of the membranes after the water pump is opened; when the smoke passes through the membrane component, differential pressure is formed on the two sides of the membrane pipes; vapour in the smoke is condensed in nanopores in the surface of the ceramic membranes due to the capillary condensation effect, enters the membrane pipes in virtue of the differential pressure on the two sides of the ceramic membranes, and is mixed with the cooling water, so that the smoke moisture is recovered. In the meantime, heat is transferred on the two sides of the membrane pipes, so that the smoke waste heat is recovered. The smoke moisture and waste heat recovery device has good spontaneity, is high-efficient and environment-friendly, and is applicable to recovery of a large quantity of moisture and waste heat resources in the smoke, and the operation cost of the thermal power plant is reduced.

Description

technical field [0001] The invention relates to a flue gas moisture waste heat recovery device based on a hollow micro-nano porous ceramic membrane, and belongs to the technical field of energy saving and emission reduction in thermal power plants. Background technique [0002] The potential for moisture recovery in thermal power plants is huge. Under normal circumstances, the exhaust gas of coal-fired power plants contains water vapor with a volume fraction of 4% to 13%, and the volume fraction of water vapor in gas-fired power plants is 15% to 20%. According to estimates, the amount of water discharged into the atmosphere with flue gas from thermal power plants alone in the country can reach 1.1 billion tons every year. If 20% of the water vapor in the flue gas exhaust can be recovered and high-quality water recovery can be realized, the boiler water supply of thermal power plants can be self-sufficient. At the same time, the boiler exhaust smoke contains rich waste heat...

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Problems solved by technology

[0003] At present, the technology used for the recovery of flue gas moisture and waste heat in thermal power plants is mainly concentrated on the heat exchanger condensation technology. Although the design cost is not high, and there are many mature and reliable operation technologies for reference, there are several problems And more difficult problems: 1) Condensed water is acidic and cannot be directly recycled, it needs further treatment; 2) The working temperature is mostly below the dew point temperature of flue gas water, and the working environment is harsh, and acidic substances and mercury will be condensed, so Pipes need to use corrosion-resistant materials, such as commonly used fluoroplastics, which have good corrosion resistance, but they are expensive, have low thermal conductivity and are not easy to process; Regular ash removal; 4) It needs to provide a huge surface area for low-temperature flue gas and equipment materials are more susceptible to corrosion

The United States has also applied this ceramic membrane to flue gas moisture and waste heat recovery in gas-fired power plants and conducted related demonstrations, but so far, there has been no relevant research in China

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