Low-rank coal upgrading and power generation integrated system based on the combination of solar energy and coal gasification

Abstract

The invention discloses a low-order coal quality improvement and power generation integrated system based on solar energy and coal gasification combination, belonging to the field of low-order coal quality improvement. The system mainly comprises a solar heat collector, a pyrolyzer, a coal / semicoke cooler, a predrying device, a boiler, a steam turbine and a power generator. According to the system, the solar heat collector, a low-order coal quality improvement system and a small-sized power generation system are coupled; the solar heat collector provides hot air for the boiler and the pyrolyzer; and a combustible gas from the low-order coal quality improvement system enters the boiler of the small-sized power generation system for combustion, and boiler flue gas of the small-sized power generation system and steam extracted by the steam turbine enter the pyrolyzer. The system disclosed by the invention realizes the coupling of the solar heat collector, the low-order coal quality improvement system and the small-sized power generation system, sufficiently utilizes a solar resource, thereby achieving the effects of low cost and high yield; in addition, the system disclosed by the invention prevents the energy waste, achieves the effects of waste heat utilization, sufficient gradient energy utilization and can be sued for producing a coal / semicoke product.

Description

technical field [0001] The invention belongs to the field of low-rank coal upgrading, in particular to a low-rank coal upgrading and power generation integrated system based on the combination of solar energy and coal gasification. Background technique [0002] China's energy structure has always been dominated by coal, and for a long period of time, coal will still occupy a dominant position in my country's primary energy. Due to the excessive development and utilization of bituminous coal and anthracite in the world, the development and utilization of low-rank coal has been paid more and more attention by various countries. [0003] Low-rank coal accounts for a large proportion of the world's total coal reserves, and its utilization has become more and more extensive. In China, low-rank coal reserves exceed 200 billion tons, mainly distributed in the sparsely populated Xinjiang and Inner Mongolia Autonomous Regions. However, low-rank coal has high moisture and volatile c...

AI Technical Summary

Problems solved by technology

However, low-rank coal has high moisture and volatile content, low calorific value and easy spontaneous combustion, and is not conducive to long-distance transportation. Direct use will lead to low efficiency, damage to boiler equipment, and damage to the environment. Therefore, low-rank coal with huge reserves Improve the quality of resources, process comprehensive utilization, reduce their ash and water content by certain means, thereby increasing the calorific value, or produce high value-added products, which will alleviate the increasingly tense energy pressure in our country, reduce energy consumption, and protect the environment. is of great significance

[0004] The traditional low-rank coal upgrading system only focuses on the improvement of coal quality, and does not comprehensively utilize heat sources for upgrading, resulting in a lot of energy waste. At the same time, it does not introduce clean and cheap energy such as solar energy for quality improvement. higher cost

[0005] The present invention proposes a low-rank coal upgrading and power generation integrated system based on solar energy and coal gasification, which solves the above-mentioned problems of energy waste and high cost. The system is aimed at solar collectors and low-rank coal upgrading systems And the small power generation system is efficiently coupled, and the energy is used in a reasonable cascade, and the dual output of coal / semi-coke and electric energy is realized, which can effectively reduce costs and make full use of energy. It is a suitable for low-rank coal development. Promising New Technology

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