Sludge and microalgae supercritical co-rapid hydrothermal liquefaction oil production system and process based on aqueous phase algae culture

Abstract

The invention provides a sludge and microalgae supercritical co-rapid hydrothermal liquefaction oil production system and process based on aqueous phase algae culture. The system comprises a raw material conveying unit, a preheating reaction unit, a temperature and pressure reduction unit, a product separation unit, an oil phase upgrading unit and a microalgae culture unit. The microalgae cultivation unit is used for cultivating microalgae. The raw material conveying unit is used for buffering, deironing, grinding and homogenizing microalgae and sludge, then inputting the microalgae and the sludge into the preheating reaction unit, enabling the microalgae and the sludge to pass through a high-frequency electromagnetic induction heater and enter a supercritical rapid hydrothermal liquefaction reactor, and outputting a hydrothermal product. The temperature and pressure reduction unit recovers waste heat through an organic working medium Rankine cycle device. The hydrothermal product is centrifugally separated into a water-phase product, a solid-phase product and an oil-phase product through the product separation unit. The oil-phase product is converted into biological fuel oil through an oil phase upgrading unit. According to the method, the oil yield of the sludge and the microalgae is improved through rapid preheating, supercritical rapid hydrothermal and co-liquefaction technologies, and cyclic utilization of the water-phase product is achieved.

Description

technical field

[0001] The invention relates to the field of thermochemical conversion of biomass or the field of sludge treatment or the field of environmental protection, and in particular to a supercritical co-rapid hydrothermal liquefaction oil production system and process of sludge and microalgae based on water-phase algae cultivation. Background technique

[0002] Sludge is a by-product in the process of urban sewage treatment. It has large output, fast growth rate, high water content, difficult to remove water, high content of organic matter, heavy metals and refractory toxic pollutants. The traditional treatment methods of municipal sludge (landfill, composting, incineration, etc.) x , dioxin and other secondary pollution problems, and further drying of mechanically dewatered sludge is required to reduce the water content. The high drying cost leads to sludge treatment and disposal costs accounting for more than 50% of the operating costs of sewage treatment plants....

Examples

Embodiment 1

[0050] Such as figure 1 As shown, the oil production process of the sludge and microalgae supercritical co-rapid hydrothermal liquefaction oil production system based on water phase algae cultivation of the present invention comprises the following steps:

[0051] Raw material transportation: the sludge produced by the sewage treatment plant is transported to the inlet of the buffer pool 1, and the microalgae after cultivation are transported to the inlet of the buffer pool 1, and the sludge and microalgae are mixed in the buffer pool 1, and the sludge The moisture content of the microalgae and the microalgae is 70-95wt%, and the viscosity is 1000-200000mPa·s. The anchor agitator in the buffer tank 1 initially mixes the sludge and the microalgae; the preliminarily mixed sludge and microalgae enter the iron remover 2 The inlet port is used to remove ferromagnetic impurities in the raw materials to ensure the safe operation of the grinding pump 3; the raw materials after iron re...

Embodiment 2

[0058] The difference between Example 2 and Example 1 is that the sludge and microalgae are rapidly preheated to 500-600°C by the high-frequency electromagnetic induction heater 6 and then enter the supercritical rapid hydrothermal liquefaction reactor 7 to undergo supercritical co-rapid Hydrothermal liquefaction reaction, when the reaction temperature is 500°C and the reaction time is less than 1min or the reaction temperature is 550°C and the reaction time is less than 50s or the reaction temperature is 600°C and the reaction time is less than 40s, an oil phase product higher than 25wt% can be obtained 13 Yield.

technical field

[0001] The invention relates to the field of thermochemical conversion of biomass or the field of sludge treatment or the field of environmental protection, and in particular to a supercritical co-rapid hydrothermal liquefaction oil production system and process of sludge and microalgae based on water-phase algae cultivation. Background technique

[0002] Sludge is a by-product in the process of urban sewage treatment. It has large output, fast growth rate, high water content, difficult to remove water, high content of organic matter, heavy metals and refractory toxic pollutants. The traditional treatment methods of municipal sludge (landfill, composting, incineration, etc.) x , dioxin and other secondary pollution problems, and further drying of mechanically dewatered sludge is required to reduce the water content. The high drying cost leads to sludge treatment and disposal costs accounting for more than 50% of the operating costs of sewage treatment plants....

Examples

Embodiment 1

[0050] Such as figure 1 As shown, the oil production process of the sludge and microalgae supercritical co-rapid hydrothermal liquefaction oil production system based on water phase algae cultivation of the present invention comprises the following steps:

[0051] Raw material transportation: the sludge produced by the sewage treatment plant is transported to the inlet of the buffer pool 1, and the microalgae after cultivation are transported to the inlet of the buffer pool 1, and the sludge and microalgae are mixed in the buffer pool 1, and the sludge The moisture content of the microalgae and the microalgae is 70-95wt%, and the viscosity is 1000-200000mPa·s. The anchor agitator in the buffer tank 1 initially mixes the sludge and the microalgae; the preliminarily mixed sludge and microalgae enter the iron remover 2 The inlet port is used to remove ferromagnetic impurities in the raw materials to ensure the safe operation of the grinding pump 3; the raw materials after iron re...

Embodiment 2

[0058] The difference between Example 2 and Example 1 is that the sludge and microalgae are rapidly preheated to 500-600°C by the high-frequency electromagnetic induction heater 6 and then enter the supercritical rapid hydrothermal liquefaction reactor 7 to undergo supercritical co-rapid Hydrothermal liquefaction reaction, when the reaction temperature is 500°C and the reaction time is less than 1min or the reaction temperature is 550°C and the reaction time is less than 50s or the reaction temperature is 600°C and the reaction time is less than 40s, an oil phase product higher than 25wt% can be obtained 13 Yield.

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