Microalgae high-pressure continuous tower-type liquefying process

Abstract

The invention provides a microalgae high-pressure continuous tower-type liquefying process, which comprises the following steps of: pressurizing microalgae-containing suspension by using a high-pressure pump, making the suspension flow through a heat exchanger to exchange heat with liquefied liquid, heating to be between 180 and 250 DEG C according to a certain heating curve by using a heating furnace, and preserving heat in a gelatinizing tower for certain time to make solid biomass changed into flowable slurry; quickly heating gelatinized liquid to be between 270 and 350 DEG C at a certain heating rate by using a secondary heating furnace, and adding into a liquefying tower for hydrothermal liquefying to prepare a liquid fuel; separating coke slurry from a hydrothermal liquefying product by using a high-pressure settling tank, discharging the coke slurry from a coke slurry outlet, and making liquefied gas liquid pass through the top of the high-pressure settling tank, exchange heat with the microalgae suspension through the heat exchanger and flow into a three-phase separator; separating the liquefied gas liquid into a water phase, an oil phase and a gas phase in the three-phase separator, circulating and discharging the water phase by connecting the water phase with the high-pressure pump and a discharging port from the lower part of the three-phase separator, concentrating to prepare a foliar fertilizer, biological gasoline or a snow-melting agent and the like, discharging the oil phase from a biological oil outlet in the middle of the three-phase separator to obtain a product, and discharging the gas phase from a tail gas outlet on the top of the three-phase separator to serve as a fuel; and discharging the solid-phase coke slurry to serve as an activated carbon material or a fuel.

Description

1. Technical field [0001] The invention provides a microalgae high-pressure continuous tower liquefaction process, which belongs to the field of biological energy. 2. Background technology [0002] Converting biomass into high-grade gaseous and liquid fuels can reduce dependence on fossil fuels such as oil and coal. At the same time, the use of biomass energy can slow down CO2 emissions and has become a research hotspot in the chemical industry around the world. The direct conversion of biomass into liquid fuels can be divided into rapid pyrolysis liquefaction and high-pressure liquefaction. Rapid pyrolysis liquefaction is suitable for biomass with low water content, such as straw and sawdust, and high-pressure liquefaction is suitable for biomass with high water content. The process of thermal decomposition reaction of high-water content biomass in high-pressure and medium-temperature hot water does not require dehydration, drying and crushing. As with the high temperatu...

AI Technical Summary

Problems solved by technology

However, since the research on high-pressure liquefaction of biomass is just in its infancy, most of the research is in the batch operation of autoclaves, and it is difficult to realize large-scale industrial production

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