Solar-driven lignite multi-generation power generation system and operation method

Abstract

The invention discloses a solar-driven lignite multi-generation power generation system and an operation method. The system comprises a steam dryer, a tower type solar pyrolyzer, a tower type solar gasifier, a mixer, a combustion chamber and a gas turbine which sequentially communicate, and further comprises a waste heat utilization system which is formed by sequentially communicating a waste heatboiler, a steam turbine, a condenser and a water pump; a tower type solar reflector field is used for focusing solar energy as a heat source of the tower type solar gasifier and the tower type solarpyrolyzer, and a groove type solar energy collector is used for focusing solar energy as a heat source of the steam dryer, and the purpose is that the heat sources of the tower type solar gasifier, the tower type solar pyrolyzer and the steam dryer are maintained at the optimal temperature on the basis of fully utilizing solar energy; and the water and waste steam flow entering the tower type solar gasifier are adjusted through waste steam regulating valves, and the purpose is that water and the semi-coke ratio in the tower type solar gasifier is guaranteed to maintain at an optimal value. Thesystem realizes the multi-cogeneration of electricity and tar, and is clean and efficient.

Description

technical field [0001] The invention relates to the technical field of lignite drying, pyrolysis and gasification, in particular to a solar-driven lignite polygeneration power generation system and an operating method. Background technique [0002] Coal-based fossil fuels occupy a dominant position in my country's energy structure. my country has large lignite reserves, with proven lignite reserves exceeding 130 billion tons. Lignite is the mineral coal with the lowest degree of coalification. Its characteristics of high ash, high volatile matter, high moisture and low calorific value lead to low power generation efficiency and heavy pollution by directly burning lignite; therefore, efficient and clean utilization of lignite is a key technology. Lignite drying, pyrolysis, and gasification technologies are effective means to improve its utilization efficiency. However, the current independent lignite drying, pyrolysis or gasification technology faces the difficulties of exha...

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Problems solved by technology

However, the current independent lignite drying, pyrolysis or gasification technology faces the difficulties of exhaust steam, volatile gas and phenol water energy and quality recovery; at the same time, the heat source of lignite pyrolysis or gasification may come from part of the semi-coke produced by direct combustion, or pyrolysis gas produced by direct combustion, etc. This process causes a lot of waste of high-grade heat, which does not conform to the principle of energy cascade utilization; at the same time, directly extracting part of the boiler flue gas for lignite drying, pyrolysis or gasification is faced with Many problems caused by excessive extraction of flue gas

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