Brown coal upgrading-power generation co-production system

Abstract

The invention relates to a brown coal upgrading-power generation co-production system. The brown coal upgrading-power generation co-production system is characterized in that the system comprises a raw coal crusher and a flue gas drier which is connected with the raw coal crusher, a coal outlet of the flue gas drier is connected with a coal inlet of an intermediate wall type roller dryer, a gas inlet of the flue gas drier is connected with a flue gas outlet of a boiler through a pipeline, a gas outlet of the flue gas drier is connected with a flue gas treatment system, a heating unit pipe bundle of the intermediate wall type roller dryer is connected with a steam turbine through the pipeline, extracted steam from the steam turbine flows through the heating unit pipe bundle of the intermediate wall type roller dryer, dries raw coal in the intermediate wall type roller dryer and then is input to a heat regenerative system through the pipeline, the dried upgrading coal is output through a conveyer device, and tail gases output by the intermediate wall type roller dryer are used for preheating air supplied by a boiler in a tail gas air boiler through the pipeline. For the brown coal upgrading-power generation co-production system, flue gas discharged by the boiler is used for carrying out first-stage drying on the brown coal in the flue gas drier, and then extracted steam from the steam turbine is used for carrying out second-stage drying on the brown coal, thereby enabling the brown coal to be at a higher drying degree.

Description

technical field [0001] The invention relates to a power generation cogeneration system, in particular to a lignite upgrading-power generation cogeneration system. Background technique [0002] my country's proven reserves of lignite are more than 100 billion tons, accounting for more than 13% of my country's total coal reserves. Its supply is sufficient and its price is low. It will be widely used in power generation and various industrial fields in the future. However, the high water content and low calorific value of lignite make its transportation cost high and its utilization efficiency low. Drying lignite to produce upgraded coal with a moisture content close to that of bituminous coal is an effective means for efficient utilization of lignite. [0003] Most of the energy lost in the coal-fired power generation process is taken away by boiler exhaust and steam turbine exhaust. This energy is waste heat in the coal-fired power generation process. Trying to use this ener...

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Problems solved by technology

However, the high water content and low calorific value of lignite make its transportation cost high and its utilization efficiency low

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