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High-alkali coal pretreatment system and high-alkali coal pretreatment method using electrodynamic sodium removal

A high-alkali coal and electric power technology, applied in the field of high-alkali coal pretreatment system, can solve the problems of reducing ash melting point, reducing boiler efficiency, pipe bursting, etc., to improve grade and utilization efficiency, enhance removal effect, and ensure moisture. desired effect

Inactive Publication Date: 2019-11-29
XI AN JIAOTONG UNIV
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  • Claims
  • Application Information

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Problems solved by technology

However, Zhundong coal has a high content of alkali and alkaline earth metals, which will cause serious ash accumulation and slagging and affect the combustion and utilization of coal
Sodium volatilizes at high temperature and forms corresponding inorganic salts with other inorganic elements, such as sulfur and chlorine, and deposits on the heat exchange surface of the boiler through condensation, agglomeration, bonding, etc. At the same time, these alkali metals can promote the interaction between other elements , generate low-temperature eutectic, reduce the melting point of ash, and cause ash accumulation and slagging to intensify, which will cause corrosion, wear, tube burst and other phenomena in the boiler, reduce boiler efficiency, and threaten the economic and safe operation of the boiler at all times. The content of metallic sodium in coal has become a research hotspot in high-alkali coal

Method used

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  • High-alkali coal pretreatment system and high-alkali coal pretreatment method using electrodynamic sodium removal

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Embodiment Construction

[0031] The present invention is described in further detail below in conjunction with accompanying drawing:

[0032] see figure 1 , a high-alkali coal pretreatment system for electrodynamic desodiumization provided by the present invention, including a crusher 1, a coal mill 2, an electrolytic cell 3, a power distribution cabinet 4, a stirring device 5, a filter press 6, and a scraper conveyor Machine 7, drum dryer 8, furnace 9, economizer 10, SCR denitrification device 11, air preheater 12, high temperature induced draft fan 13, primary fan 15, secondary fan 14, dust collector 16, desulfurization device 17 and chimney 18.

[0033]After raw coal enters the crusher 1, it passes through the coal mill 2 to pulverize, and then enters the mixing chamber of the electrolytic cell 3 to form a uniform coal-water slurry under the action of the stirring device 5. At the same time, DC voltage is connected between the cathode and anode electrodes, and the water The cations such as sodium...

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Abstract

The invention discloses a high-alkali coal pretreatment system and a high-alkali coal pretreatment method using electrodynamic sodium removal. According to the present invention, by using an electrochemical sodium removal technology, the removal efficiency of the sodium metal in coal is improved by electrolyzing coal water slurry, wherein coal powder and water are mixed to form uniform coal waterslurry, current can pass through the coal water slurry when a direct-current voltage is connected between a negative electrode and a positive electrode, sodium and other positive ions can be separatedout of the coal and are enriched in a negative electrode chamber, negative ions can be enriched in a positive electrode chamber, and the treatment time and the effect can be controlled by adjusting the direct-current voltage so as to achieve efficient sodium removal; and the electrolyzed coal water slurry is dehydrated and dried by combining a filter press and a roller dryer, such that the coal powder meets the moisture requirement of boiler feeding, wherein part of high-temperature flue gas in front of a coal economizer is used as the heat source of a drying machine, and enters a dust remover after being cooled, and the condensed water of the filter press and the drying machine is used as circulating water to return to an electrolytic tank.

Description

technical field [0001] The invention relates to a high-alkali coal pretreatment system and method for electrodynamic desodiumization. Background technique [0002] Today, coal still occupies a dominant position in my country's primary energy production and consumption, and the Zhundong coalfield is currently the largest integrated coalfield in my country, with a predicted reserve of about 390 billion tons. Zhundong coal is not only rich in reserves, but also has the advantages of low ash, low sulfur, and high calorific value. It is a high-quality steam coal. However, Zhundong coal has a high content of alkali and alkaline earth metals, which will cause serious ash accumulation and slagging and affect the combustion and utilization of coal. Sodium volatilizes at high temperature and forms corresponding inorganic salts with other inorganic elements, such as sulfur and chlorine, and deposits on the heat exchange surface of the boiler through condensation, agglomeration, bondin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L9/00C10L5/04
CPCC10L5/04C10L9/00
Inventor 王长安孙瑞金胡广涛赵磊杜勇博车得福
Owner XI AN JIAOTONG UNIV
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