A system and method for coal desulfurization and recovery of elemental sulfur

A technology for recovering single and elemental sulfur, which is applied in the direction of sulfur preparation/purification, chemical instruments and methods, sulfur compounds, etc., and can solve the problem of not considering the microwave treatment process temperature, microwave leakage, failure to achieve continuous production, ignoring collection and sulfur Recycling and other issues, to achieve broad industrial application prospects, small footprint, and reduce the consumption of microwave energy

Active Publication Date: 2020-01-07
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

US4076607 first proposed this method, CN206051972A (a microwave pretreatment device for high-sulfur coal desulfurization), CN102816623A (a microwave low-temperature dehydration and desulfurization coal upgrading device) and CN105623775A (a microwave thermal decomposition desulfurization device) The methods for removing mercury, sulfur, and nitrogen in coal gangue) etc. all adopt microwave radiation to remove sulfur in coal / coal gangue, but the above-mentioned methods only consider the release method of sulfur in coal, and generally ignore the release of sulfur after the reaction. The collection of outgassing and the recovery of sulfur are limited by the type of reactor, and the existing patents may fail to achieve continuous production, or fail to consider safety issues such as microwave treatment process temperature and microwave leakage.

Method used

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  • A system and method for coal desulfurization and recovery of elemental sulfur

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] A system for desulfurizing high-sulfur coal and recovering elemental sulfur, such as figure 1 As shown, the system includes:

[0060] The raw coal crushing unit is used for crushing raw coal, including a crusher 1, and the crusher 1 is preferably a ring hammer crusher 1 and / or a hammer crusher 1;

[0061] Raw coal drying unit, used for drying raw coal, including dryer 2;

[0062] The microwave desulfurization unit is used for the microwave desulfurization of coal, including a microwave reactor 5, and the infrared temperature measuring probe 4, a humidity sensor and a pressure sensor connected to the control system are arranged in the microwave reactor 5; the microwave desulfurization unit also includes A microwave leakage suppression device 6, the microwave leakage suppression device 6 is made of graphite and / or alloy, and the microwave leakage suppression device 6 is arranged on the bottom and / or both sides of the microwave desulfurization unit;

[0063] The exhaust ...

Embodiment 2

[0073] Using the system described in Example 1, using the method for desulfurizing high-sulfur coal and producing elemental sulfur in Example 1, a high-sulfur coal desulfurization test was carried out. The details are as follows: In a 1000MW coal-fired power plant, the coal consumption is 360t / h, the sulfur content in the high-sulfur raw coal is 3.56%, and the moisture content is 6.11%. ℃ The boiler flue gas is introduced into the front end of the dryer, and the SO in the flue gas 2 The content is 2000mg / Nm 3 , O 2 The content is 6%, the flue gas flow rate is 15×10 4 N m 3 / h, the moisture content of raw coal after drying is reduced to 4.23%, the outlet flue gas temperature drops to 180°C, the raw coal after drying enters the conveyor belt, and the conveying capacity of the conveyor belt is 50t / h, and the raw coal enters the microwave reactor at 2540MHz , irradiation 3min in the microwave of power 300W, the sulfur content in the coal after desulfurization is reduced to 1.4...

Embodiment 3

[0076] Using the system described in Example 1, using the method for desulfurizing high-sulfur coal and producing elemental sulfur in Example 1, a high-sulfur coal desulfurization test was carried out. The details are as follows: In a 500MW coal-fired power plant, the coal consumption is 200t / h, the sulfur content in the high-sulfur raw coal is 6.24%, and the moisture content is 7.21%. ℃ The boiler flue gas is introduced into the front end of the dryer, and the SO in the flue gas 2 The content is 4000mg / Nm 3 , O 2 The content is 6%, the flue gas flow rate is 10×10 4 N m 3 / h, the moisture content of the raw coal after drying is reduced to 4.61%, the outlet flue gas temperature drops to 160°C, the dried raw coal enters the conveyor belt, and the conveying capacity of the conveyor belt is 30t / h, and the raw coal enters the microwave reactor at 2540MHz , the power of 500W microwave irradiation for 5 minutes, the sulfur content in the coal after desulfurization is reduced to 1...

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Abstract

A system and a method for desulfurizing coal and recovering elemental sulfur. The system comprises a microwave desulfurization unit, and further comprises a raw coal drying unit, an exhaust gas collecting unit, and an elemental sulfur reaction unit, a discharge port of the raw coal drying unit being connected to a feed port of the microwave desulfurization unit, the exhaust gas collecting unit being disposed at an air outlet of the microwave desulfurization unit, and an air inlet of the elemental sulfur reaction unit being respectively connected to an air outlet of the raw coal drying unit and an air outlet of the exhaust gas collecting unit. The system and method can simultaneously remove and recover sulfur from coal, producing treated coal with a total sulfur content of less than 2.0%, and a total recovery rate of elemental sulfur of not less than 40%. The system and the method are safe and energy-saving and are suitable for desulfurization and sulfur recovery of medium- and high-sulfur coals of varying quality.

Description

technical field [0001] The invention belongs to the technical field of coal cleaning, and relates to a system and method for desulfurizing coal and recovering and producing elemental sulfur. Background technique [0002] my country is rich in coal resources, and the average sulfur content in coal is 1.72%. Among them, the proven reserves of high-sulfur coal (S content ≥ 2.0%, including high-sulfur coal and medium-sulfur coal) account for about 1 / 3 of the total coal reserves, accounting for 1 / 3 of the raw coal production. 16.67%, which has great potential application value. [0003] There are huge sulfur resources in high-sulfur coal. In 2016, my country's raw coal output totaled 33.64 tons. If the S content in coal was 2.0%, the S content contained in high-sulfur coal was 11.21 million tons; in 2016, my country's sulfur production was only 5.16 million tons, 11.961 million tons of imported sulfur, more than 50% of foreign dependence, and my country's current use of high-sulfu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B17/04C10L9/02
CPCC01B17/0404C10L9/02Y02P20/10
Inventor 朱廷钰郭旸旸刘建民薛建明董月红
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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