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Brown coal upgrading-power generation co-production system

A technology of lignite and heat recovery system, which is applied in the direction of machines/engines, combustion methods, lighting and heating equipment, etc., and can solve the problems of high transportation costs, low calorific value, and low utilization efficiency

Active Publication Date: 2014-06-04
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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  • Brown coal upgrading-power generation co-production system

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Embodiment Construction

[0014] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0015] see figure 1 , the present invention includes a raw coal crusher 1 and a flue gas dryer 2 connected with the raw coal crusher 1, the coal outlet of the flue gas dryer 2 is connected with the coal inlet of the partition drum dryer 3, and the flue gas The gas inlet of the dryer 2 is connected to the flue gas outlet of the boiler 5 through the pipeline and the boiler flue gas dust collector 6, and the gas outlet of the flue gas dryer 2 is connected to the flue gas treatment system through the flue gas dryer dust collector 7. The heating unit tube bundle of the partition wall drum dryer 3 is connected to the steam turbine 8 through pipelines, and the steam extracted by the steam turbine flows through the heating unit tube bundle of the partition wall drum dryer 3 and dries the raw coal in it, and then is input to the recuperator through the condensate reco...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F26B11/04F26B21/14F23L15/00F01K17/06F01D15/10
CPCY02E20/34
Inventor 严俊杰刘明种道彤刘继平邢秦安王进仕
Owner XI AN JIAOTONG UNIV
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