Device and method for pretreatment of biological natural gas synthesis through coupling between brown coal base and biomass

Abstract

The invention discloses a device for the pretreatment of biological natural gas synthesis through coupling between brown coal base and biomass. The device comprises a brown coal powder chamber, a straw powder chamber, a carbon powder chamber, and a calcium oxide powder chamber. The device is characterized in that the outlets of four abovementioned chambers are all connected to a converging belt conveyor through respective electronic belts. The converging belt conveyor is sequentially and serially connected to a mixing machine, a rotation type discharging chamber, and a derived fuel granulator. The invention also discloses a method the pretreatment of biological natural gas synthesis through coupling between brown coal base and biomass. The method has the advantages that the brown coal upgrading cost is low, the granulation is convenient, and the steps are simple. The gas yield in the post gasification step is increased. Moreover, the risk of catalyst inactivity in the post gas production step is largely reduced. The comprehensive cost for gas production is largely reduced. The brow coal powder can be efficiently utilized.

Description

technical field [0001] The invention relates to a pretreatment device and method for producing natural gas from coal, in particular to a pretreatment device and method for synthesizing biological natural gas by coupling lignite and biomass. Background technique [0002] China is a country rich in coal and poor in oil, and its energy structure is dominated by coal. In recent years, coal-based natural gas has also developed relatively maturely, which includes raw coal gasification, gasification gas catalytic production of methane and other processes; but lignite is the lowest degree of coalification Coal types account for about 13% of China's coal reserves. Due to the high external and internal water content of lignite as high as 52-55%, the combustion calorific value of lignite is affected. The lowest calorific value is only about 2800 kcal. A large amount of lignite powder is left behind, which is difficult to be effectively utilized. The large amount of lignite powder produ...

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Problems solved by technology

[0002] China is a country rich in coal and poor in oil, and its energy structure is dominated by coal. In recent years, coal-based natural gas has also developed relatively maturely, which includes raw coal gasification, gasification gas catalytic production of methane and other processes; but lignite is the lowest degree of coalification Coal types account for about 13% of China's coal reserves. Due to the high external and internal water content of lignite as high as 52-55%, the combustion calorific value of lignite is affected. The lowest calorific value is only about 2800 kcal. A large amount of lignite powder is left behind, which is difficult to be effectively utilized. The large amount of lignite powder produced is extremely poor in economy and environmental protection. If it cannot be handled well, it will not only cause a great waste of resources, but also bring great pollution to the local area; in order to improve For the calorific value of lignite powder, most domestic and foreign countries adopt the technical route of drying and upgrading, and the cost of upgrading is high, which affects the efficient utilization of lignite; if the granulation treatment is carried out before coal gas production, due to the low strength of lignite, it is difficult to granulate. Adhesives need to be added, which not only increases the cost, but also complicates the process; in addition to the high sulfur content of lignite, the existing coal-to-natural gas technology and pre-treatment cannot effectively reduce the sulfur content in the gas, which will lead to The deactivation of the catalyst in the methane process seriously affects the efficiency and cost of methanation

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