Technique and system for low-rank coal moisture resource utilization

A process method and low-rank coal technology, applied in separation methods, chemical instruments and methods, and dispersed particle separation, etc., can solve the problems of high water recovery efficiency and failure to consider the recovery and utilization of dry flue gas heat, etc., to achieve heat recovery utilization High efficiency, alleviating water scarcity, and simple technological process

Active Publication Date: 2015-01-14
WUHUAN ENG
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  • Application Information

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Problems solved by technology

Using direct contact heat and moisture exchange, the water recovery efficiency is high, and the patent also reports the subsequent upgrading and utilization of low-temperature and low-humidity flue gas after water recovery, but it does not consider fully recovering and utilizing the heat in the water vapor in the dry flue gas

Method used

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  • Technique and system for low-rank coal moisture resource utilization

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Embodiment Construction

[0027] The system of the present invention will be further explained below in conjunction with the accompanying drawings:

[0028] The cyclone separator 1.1 is sequentially connected with the pressurization system 2, the desulfurization system 3, the low-temperature heat energy utilization system 4, the gas-liquid separation tank 5, the cooling system 6 and the condensed water collection system 8, and a collection pool 1.2 is provided under the cyclone separator 1.1 , the collection tank 1.2 is connected to the condensed water collection system 8 through the filter 7. The low-temperature heat energy utilization system is at least one of a low-temperature power generation unit with an organic working fluid as a circulating medium, or a lithium bromide absorption refrigeration unit, or a low-temperature mechanical work unit. The specific implementation of each unit is an existing mature technology. This will not be described in detail.

[0029] working principle:

[0030]The w...

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Abstract

The invention relates to a technique and a system for low-rank coal moisture resource utilization and solves the problems of insufficient moisture and heat recovery and environmental pollution during existing low-rank coal drying. The technique is characterized in that water vapor generated after drying of low-rank coal is fed to cyclone separator for removing solid particles and water drops formed by disturbance, the water vapor with dust removed is pressurized via a pressurization system prior to entering a desulfurization system for removing sulphureous components, the desulfurized water vapor is fed into a low-temperature heat utilization system for recovering low-temperature heat in the vapor and then enters a gas-liquid separation tank for separating non-condensable gas and liquid water, the liquid water is cooled by a cooling system and then fed into a condensate collection system, and dust content in condensate in the condensate collection system is less than 5ppm. The technique and the system are capable of sufficiently recovering moisture in the water vapor generated after low-rank coal drying, are environmentally friendly and have remarkable economic benefit.

Description

technical field [0001] The invention relates to the field of comprehensive utilization of low-rank coal, in particular to a process method and system for water resource utilization of low-rank coal. Background technique [0002] my country is rich in low-rank coal resources, and low-rank coal represented by lignite / sub-bituminous coal accounts for more than 55%, with reserves reaching 561.2 billion tons. Recently, Xinjiang has added about 2.19 trillion tons of coal reserves, mostly sub-bituminous coal. Low-rank coal has low degree of coalification, developed capillary pores, high oxygen content (about 20% for anhydrous and ash-free base), rich internal water, up to 30-50% total moisture, low calorific value, and poor thermal stability. Long-distance transportation, direct use as large-scale gasification raw materials has great limitations, and is currently mainly used as power fuel in local areas, with a low development rate, accounting for only 4-5% of the national coal ou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F26B25/00B01D45/16
CPCY02P70/10
Inventor 陈风敬卢文新夏吴张大州王志刚游伟桂磊
Owner WUHUAN ENG
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