Process for removing sodium in high-sodium coal and system thereof

A high-sodium coal and sodium system technology, which is applied to the high-sodium coal removal process and its system field, can solve the problems that are not described, and achieve the effects of improving quality, good sodium removal effect, and shortening production cycle.

Active Publication Date: 2012-09-12
WUHUAN ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Through the search of the coal washing process technology, it is found that there is no rel

Method used

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  • Process for removing sodium in high-sodium coal and system thereof
  • Process for removing sodium in high-sodium coal and system thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The main indicators of raw coal are as follows:

[0036] Total water content 31.9 wt%, dry basis ash content 8.92 wt%, Na 2 The content of O is as high as 12.78wt%.

[0037] (1) High-sodium coal is sent to the mixing tank 2 through the lock hopper 1, and water (including fresh water and condensate from the steam drum circulation) is added to stir to make water-coal slurry. The weight ratio of water to coal is 2.5:1~1: 3. The stirring speed is 500-1500 rpm;

[0038] (2) The coal-water slurry obtained in step (1) passes through the high-pressure pump 5, the tube side of the primary heat exchanger 6 and the secondary heat exchanger 7, and the flash water from the low-pressure flash tank 11 and the high-pressure flash tank 12 After the steam is preheated to 130-170°C, it is sent to the heating furnace 8 to be heated to 200-270°C, and then sent to the autoclave 9 to pressurize to 80-160 barg;

[0039] (3) Send the coal-water slurry obtained in step (2) into the high-press...

Embodiment 2

[0044] The main indicators of raw coal are as follows:

[0045] Total water content 25.4 wt%, dry basis ash content 7.35 wt%, Na 2 The content of O is 6.53 wt%.

[0046] Except that the heating temperature of the coal-water slurry in step (2) is changed to 320-380° C., and the pressure is changed to 220-280 barg, the rest is the same as that of Example 1.

[0047] The water content in the sodium-removed coal obtained by the above-mentioned sodium-removal process method is about 2.8 wt%, the dry basis ash content is 2.8 wt%, and the Na 2 The content of O is 0.2 wt%.

[0048] The resulting clean water has a water content ≥ 99.9 wt%, ash content ≤ 20 ppm, Na 2 O content ≤ 2.5 ppm.

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Abstract

The invention relates to a process technology for removing sodium in high-sodium coal, which can solve the problems that a special removal process for the high-sodium coal is absent in the prior art, and follow-up processes and equipment are seriously affected. According to the process disclosed by the invention, sodium element in the coal can be removed by utilizing the principle of dissolving asodium compound at high temperature and high pressure and performing clarification and centrifugal separation through a black water treatment system to separate the sodium element from coal solid particles, the coal particles after sodium removal and ash removal and clean water can be simultaneously obtained, and the process is environment-friendly and has the advantages of simple process, high sodium removal efficiency, energy conservation and consumption reduction, and is suitable for purification, development and utilization of the sodium-containing coal and particularly suitable for coal gasification, IGCC (integrated gasification combined cycle) power generation and other technologies of the high-sodium coal after the sodium removal.

Description

technical field [0001] The invention relates to the field of fuel purification, in particular to a process for removing sodium from high-sodium coal and a system thereof. Background technique [0002] my country's low-rank coal resources are rich in low-rank coal resources, and low-rank coal can be effectively utilized through pyrolysis and gasification. process has some influence. For example, alkali metal salts can lower the melting point of ash and cause slagging; volatilization of alkali metals into the gas phase can cause corrosion and blockage of waste heat boiler pipes. For coal combustion and utilization, sodium in coal is a harmful component. Usually, it is related to the ash on the high-temperature heating area of ​​the boiler, which directly causes ash deposition and corrosion of combustion and gas utilization equipment. As a new generation of clean coal power generation technology, IGCC has attracted great attention from all over the world due to its high power ...

Claims

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Application Information

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IPC IPC(8): C10L9/00
Inventor 张宗飞唐凤金章卫星赵涛徐建民
Owner WUHUAN ENG
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