Clean coal and preparation method thereof

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By uniformly adsorbing the soluble sulfur-fixing agent dissolved in starch gelatinization liquid in coal particles, the problems of unevenness of the sulfur-fixing agent and low combustion efficiency are solved, and efficient sulfur-fixing effect and combustion performance improvement are achieved.

CN118772930BActive Publication Date: 2025-10-03NINGBO JIUFENG THERMOELECTRICITY CO LTD +1

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Patent Information

Application Number: CN202410786318.0
Authority / Receiving Office: CN · China
Patent Type: Patents(China)
Current Assignee / Owner
Filing Date: 2024-06-18
Publication Date: 2025-10-03
Estimated Expiration: 2044-06-18

Application Information

Patent Timeline

18 Jun 2024

Application

CN202410786318.0

03 Oct 2025

Publication

CN118772930B

IPC: C10L5/04; C10L9/10

CPC: C10L5/04; C10L9/10; C10L5/366; C10L2290/24; C10L2290/06; C10L2290/08; C10L2290/141; C10L2290/18

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Application Domain

Solid fuels Fuel additives

Technology Topics

Starch gelatinization Fluidized bed

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AI Technical Summary

Technical Problem

Existing sulfur-fixing agents have problems of unevenness, coking and low combustion efficiency during coal combustion, which affects boiler efficiency and pollutes the environment.

Method used

Soluble sulfur-fixing agents are dissolved in starch gelatinized liquid, and are uniformly adsorbed into coal particles through the regulation of amylase. A mixture of Ba(OH)2, Ca(HCO3)2 and Mg(HCO3)2 is used as a sulfur-fixing agent to improve the sulfur-fixing effect and combustion efficiency.

Benefits of technology

The improvement of sulfur fixation effect and combustion efficiency is achieved, while the negative impact on boilers is avoided, ensuring efficient sulfur emission control.

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Abstract

The present invention provides a clean coal and a preparation method thereof, belonging to the technical field of coal products. The method comprises the following steps: (1) dispersing starch in water, stirring evenly, and then fully gelatinizing the mixture; (2) adding a sulfur-fixing agent to the gelatinized liquid, and centrifuging to obtain a starch gelatinized liquid containing the sulfur-fixing agent; (3) crushing the coal to obtain coal particles; (4) transporting the coal particles to a fluidized bed, spraying the starch gelatinized liquid containing the sulfur-fixing agent on the particles while the particles are suspended, and drying to obtain coal particles adsorbed with the sulfur-fixing agent and gelatinized starch. The method dissolves a soluble sulfur-fixing agent in the starch gelatinized liquid, and then in situ adsorbs the starch liquid onto the coal particles, so that the soluble sulfur-fixing agent is uniformly adsorbed into the coal. The sulfur in the coal reacts efficiently in situ with the adsorbed soluble sulfur-fixing agent, effectively improving the combustion efficiency and sulfur-fixing effect of the coal, while not causing any negative effects on the boiler.

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