Device and method of utilizing blast furnace slag as heat carrier to prepare biomass oil

Abstract

The invention discloses a device and method of utilizing blast furnace slag as a heat carrier to prepare biomass oil. The device comprises a granulating cavity, a dryer, a pyrolysis reactor, a counterflow moving bed heat exchanger, a vibration separator and a condensation separator, a granulator is arranged in the granulation cavity, and a blast furnace slag fluidizing cabin is arranged at the bottom of the granulation cavity. The device is characterized in that the granulation cavity is used for smashing and granulating blast furnace slag through the granulator to obtain blast furnace slag grains; at the same time, the blast furnace slag fluidizing cabin outputs fluidizing air to exchange heat with the blast furnace slag grains, the blast furnace slag grains after heat exchange are output into the pyrolysis reactor, and generated high-temperature flue gas is output into the dryer to dry microalgae biomass; the pyrolysis reactor is used for mixing microalgae powder with granulated blast furnace slag grains, and the microalgae powder is pyrogasified to generate biomass pyrolysis gas. The device and method can be widely applied in the field of power, environment protection, chemical industry and steel and iron.

Description

technical field [0001] The invention relates to the technical field of preparing biomass oil, in particular to a device and a method for preparing biomass oil using blast furnace slag as a heat carrier. Background technique [0002] The iron and steel industry is a pillar industry for the development of my country's national economy. Over the past few decades, steel production technology and scale have developed rapidly. In 2013, global steel production reached 1.527 billion tons, and China's steel production was about 779 million tons, accounting for nearly half of global steel production. The total energy consumption of the iron and steel industry accounts for about 16% of the total industrial energy consumption of the country. Calculated by the energy input of 1.757GJ per ton of steel production, a total of 417 million standard coal is consumed, and 1.9 tons of carbon dioxide emissions per ton of steel are calculated, a total of 13.21 billion tons of carbon dioxide, whic...

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Problems solved by technology

However, the water quenching method has obvious defects: it consumes a lot of water resources; it cannot recover the heat of slag; it pollutes the environment; after water quenching, the slag particles need to be dried, and the additional energy consumption is high.

However, fast pyrolysis requires pretreatment of raw materials such as drying and crushing, and the moisture content of microalgae is extremely high, which consumes a lot of energy, which limits the use of fast pyrolysis technology in the preparation of bio-oil from microalgae

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