A method for leaching and removing sodium in coal by using hydrostatic pressure

A static pressure, sodium element technology, applied in the petroleum industry, solid fuels, fuels, etc., can solve the problems of insufficient sodium removal effect, high energy consumption, and difficulty, and achieve expanded utilization scale, high removal efficiency, and applicable wide-ranging effect

Active Publication Date: 2016-08-31
HUADIAN ELECTRIC POWER SCI INST CO LTD
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Problems solved by technology

For example, in the Chinese patent whose publication date is July 04, 2012, the publication number is CN102533383A, a high-sodium coal desodium purification circulation system disclosed, and the publication date is October 03, 2012, and the Chinese patent publication number is CN202465627U In the patent, a high-sodium coal ash and sodium removal system is disclosed, all of which belong to the water elution sodium technology under different conditions; generally speaking, the water washing method under normal pressure takes a long time, consumes a lot of water, and the sodium removal effect is not enough Significantly; although the effect of sodium removal under normal pressure can be improved by adding some additives, but the cost is relatively high
Another example is that the publication date is September 12, 2012, and the publication number is CN102660347A in the Chinese patent, which discloses a high-sodium coal sodium removal process and its system, which realizes the removal of sodium in coal under high temperature and high pressure conditions, but provides Continuous or intermittent high temperature and high pressure conditions require very large energy consumption, and it is difficult to scale up the processing scale, and the practicability is low
[0004] To sum up, there is still no low-energy, water-saving, and environmentally-friendly technology that can effectively remove sodium from high-sodium coal

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  • A method for leaching and removing sodium in coal by using hydrostatic pressure

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Experimental program
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Effect test

Embodiment 1

[0021] see figure 1 , The characteristics of the high-sodium coal raw coal in the present embodiment are shown in Table 1.

[0022] Table 1. Analysis results of raw coal ash components of high-sodium coal

[0023] Ash component Na 2 o K 2 o CaO MgO Fe 2 o 3 SiO 2 al 2 o 3 TiO 2 SO 2 content(%) 6.55 0.30 30.84 6.95 8.51 13.5 6.35 0.32 19.5

[0024] The percentages in Table 1 are all mass percentages. From the analysis results of the coal ash composition in Table 1, the Na in the coal ash 2 The O content is 6.55%, the CaO content is 30.84%, and the MgO content is about 6.95%, all of which are much higher than the common coal types in the world, while the acidic oxide SiO 2 Content about 13.5%, Al 2 o 3 The content is only 6.35%. Slagging index calculated according to its coal ash composition R s and dust index R f They are 1.21 and 17.26 respectively, which belong to coal with moderate slagging and serious ash acc...

Embodiment 2

[0038] In this embodiment, the method for leaching and removing sodium in coal by using hydrostatic pressure is as follows.

[0039] A. Applicable coal type is coal ash with sodium content greater than 1.5% (w / w, expressed as Na 2 O meter) of coal.

[0040]B. Apply high temperature and high pressure to the coal slurry, so that the coal slurry undergoes hydrothermal reaction underground. The concentration of coal in the coal slurry can be 30-70% (w / w). Coal slurry can be obtained by dry grinding followed by mixing with water, directly by wet grinding technology, or a combination of dry and wet grinding.

[0041] C. The underground reaction pipeline is one or more reaction pipelines perpendicular to the ground or at a certain angle to the ground. It can be constructed by using the existing local mines. The outer wall of the pipeline is rock or supported by underground rock. The technical requirements for pipeline materials The high pressure resistance performance requirement ...

Embodiment 3

[0051] In this embodiment, the method of using hydrostatic pressure to realize the leaching and removal of sodium in coal is suitable for coal ash with a sodium content greater than 1.5% (w / w, expressed as Na 2 In this method, the raw coal is first ground to a particle size below 0.2mm, and mixed with water to make a coal slurry with a concentration of 30% to 70% (w / w); then the coal slurry is transported to the reaction pipeline , and the residence time of the coal slurry in the reaction pipeline is 5 to 30 minutes, the reaction pipeline is located underground, the distance between the bottom of the reaction pipeline and the ground is 200 to 1200 meters, and the static pressure generated by the water in the coal slurry is utilized , instead of the energy consumption required to provide continuous high pressure for the reaction, the temperature of the coal slurry in the reaction pipeline is controlled to increase with the increase of the depth of the reaction pipeline. The temp...

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Abstract

The invention provides a method for leaching and removing sodium in high-sodium coal by utilizing the high-temperature and high-pressure environment generated by hydrostatic pressure and underground heating technology. In this method, the coal is ground to a certain particle size range, so that the coal slurry formed can meet the requirements of being pumped; the coal slurry is pumped from the ground inlet into the underground reaction pipeline of a certain depth, flows in the pipeline at a certain speed, and then flows from the ground inlet into the underground reaction pipeline of a certain depth. The ground outlet is pumped out; through the underground heating temperature control system, the temperature of different positions of the reaction pipeline is controlled to be below the boiling point of the water corresponding to the pressure of the position. Using the pressure of the coal slurry itself and the high temperature provided by the underground heating, the physical and chemical structure of the coal changes during the stay in the underground reaction pipeline. The water-soluble sodium and organic sodium in the coal are released from the internal structure of the coal and dissolve in the process. water, which is then further removed. This technology will provide a low-energy-consumption, water-saving and high-efficiency technical approach for the processing and utilization of high-sodium coal.

Description

technical field [0001] The invention relates to a method for leaching and removing sodium element in coal, in particular to a method for leaching and removing sodium element in coal by using hydrostatic pressure, including coal paddle forming, coal slurry pumping, coal The technical fields of underground high-temperature and high-pressure hydrothermal treatment, solid-liquid separation of coal and water, and water recovery belong to the technical field of coal processing and clean utilization. Background technique [0002] Alkali metal sodium is one of the main inorganic elements in coal, and the mass percentage of sodium in coal ash (as Na 2 O calculation) is generally less than 1.5%, while some low-rank coals, such as Xinjiang Zhundong coal in my country, have a sodium content of more than 5%, and some even as high as 7%. Higher sodium content will lead to contamination and slagging of the boiler, affect boiler output, and bring harm to the safe and economical operation o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L9/00
Inventor 王嘉瑞李小江
Owner HUADIAN ELECTRIC POWER SCI INST CO LTD
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