Brown coal pre-drying power-heat generation water recycling system of integrated absorption type heat pump

Abstract

The invention discloses a brown coal pre-drying power-heat generation water recycling system of an integrated absorption type heat pump. The brown coal pre-drying power-heat generation water recycling system is characterized in that boiler flue gas is used to pre-dry brown coal, the dried coal is combusted in a boiler to heat working medium water, the working medium water absorbs heat and becomes high-temperature and high-pressure steam which performs expansion work in a steam turbine, and mechanical work is converted into electric energy through a power generator; the integrated absorption type heat pump is used to recycle heat in pre-drying tail gas in a stepped manner so as to supply heat and recycle water at the same time, heat, power and water poly-generation is achieved, and efficient brown coal utilization is achieved. The brown coal pre-drying power-heat generation water recycling system has the advantages that the water in the brown coal drying tail gas is recycled by using a solution absorption, evaporation and recondensation method, and water recycling rate and recycled water quality are increased greatly.

Description

【Technical field】 [0001] The invention belongs to the technical field of waste heat recovery, and in particular relates to a lignite pre-drying power generation hot water recovery system integrated with an absorption heat pump. 【Background technique】 [0002] Lignite is the mineral coal with the lowest degree of coalification. In my country, its proven lignite reserves are about 130 billion tons, accounting for 13% of the country's total coal reserves. In my country, lignite is mainly distributed in the Eastern Sanmeng area, which is closely connected with the three northeastern provinces in the eastern part of Inner Mongolia. In addition, in the northern part of my country, due to the rapid development, many cities have insufficient heat supply. With the intensification of the contradiction between supply and demand of thermal coal in my country, lignite will gradually become the main fuel of thermal power plants in my country in the future. However, lignite has high mois...

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Problems solved by technology

[0003] However, there is no relatively complete system in the prior art, which can fully recover the waste heat and water vapor of the drying tail gas

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