Heat recovery method and system for recovering energy in water-rich biomass

Abstract

The invention provides a heat recovery method and system for recovering energy in water-rich biomass. The method comprises the steps of putting the water-rich biomass with the content of water of less than 99.9% into a high-pressure closed container, and heating the high-pressure closed container until the temperature T is more than or equal to 100 DEG C and less than 250 DEG C and the pressure P is more than or equal to 0.1MPa and less than 3.97MPa; maintaining the temperature and the pressure in the high-pressure closed container to be constant and standing still for a period of time to enable the water-rich biomass to be liquefied and various biomasses and solid inorganic impurities to be separated; heating the high-pressure closed container until the temperature T is more than or equal to 100 DEG C and less than 350 DEG C and the pressure P is more than or equal to 0.1MPa and less than 16.52MPa, and enabling most biomass components not to be chemically decomposed; boiling the water in the high-pressure closed container, and then guiding out high-temperature and high-pressure water vapor, recycling the energy and enabling the water-rich biomass to be dehydrated; stopping heating, cooling the high-pressure closed container and recovering waste heat; and opening the high-pressure closed container, and taking out the separated and dehydrated dry biomass and the solid inorganic impurities, wherein the separated and dehydrated dry biomass is used for energy recovery, and the separated and solid inorganic impurities are used for mineral substance and heavy metal recovery.

Description

Technical field: [0001] The invention relates to the field of water-containing solid and liquid treatment with high COD content, in particular to a heat recovery method for recovering energy in water-rich biomass and a heat recovery system using the method for recovering energy in water-rich biomass. Background technique: [0002] Today, with the rapid development of industry and agriculture, pollution reduction, energy shortage and carbon emissions have become the focus of attention of all countries in the world. At present, most developed countries have begun to save energy, reduce emissions and search for low-carbon energy to ensure the sustainable development of society. Therefore, how to save energy, reduce emissions and develop new low-carbon energy has become a new hot spot and important task in scientific and industrial application research. The development of urbanization is a remarkable feature of industrial civilization. Human settlements, industrial agglomeration...

AI Technical Summary

Problems solved by technology

However, its structure is complex and its manufacture is very difficult, so its equipment investment cost is extremely expensive, and it needs to be operated under high temperature, high pressure and oxygen enriched state, which consumes a lot of energy and has high potential safety hazards

In addition, due to the complex composition of sludge, which is usually corrosive, it is more likely to cause damage to the ultra-high temperature and high pressure reactor under high temperature and high pressure conditions, thus bringing expensive equipment maintenance and replacement costs

Ultra-high temperature and high pressure reactors are expensive to manufacture and difficult to operate. Although they can generate a large amount of heat energy, compared with the energy consumed, manufacturing, and operating costs, their cost performance is low, so they are not practical

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