A method for desulfurization of coal before combustion with ultrasonic equipment combined with composite extraction liquid

Abstract

The invention especially relates to an ultrasonic equipment and composite extract combined method for coal desulfurization before combustion. According to the ultrasonic equipment and composite extract combined method for coal desulfurization before combustion, microwave irradiation and ultrasonic cleaning are combined. Thus, coal reaction conditions can be improved, internal reaction speed of coal is accelerated, and selective modification and quality improvement of coal are realized. Meanwhile, the method has advantages of high efficiency, no corrosion, no pollution, direct treatment of 0-13 mm fine coal, no change of coking coal characteristic and further quality improvement of coal, and is of great significance for raising efficiency of coal desulfurization before combustion.

Description

technical field [0001] The invention relates to the technical field of coal desulfurization, in particular to a method for desulfurizing coal before combustion with an ultrasonic device combined with a composite extraction liquid. Background technique [0002] The sulfur in coal is not only harmful to the conversion and processing of coal, but also causes serious pollution to the environment. Therefore, the removal of sulfur in coal before combustion is an important issue in the process of coal utilization. [0003] At present, coal desulfurization technologies and processes are mainly divided into pre-combustion desulfurization, mid-combustion sulfur fixation and post-combustion desulfurization. Among them, pre-combustion desulfurization has low efficiency in removing sulfur in coal, so it is difficult to meet the requirements of environmental protection. In-combustion desulfurization is mainly to add some sulfur-fixing agents to coal. During the process of coal combustion...

AI Technical Summary

Problems solved by technology

[0015] Most chemical desulfurization methods are carried out under high temperature and high pressure, and some use different oxidants, so the operating cost and equipment investment cost are relatively high

In addition, the reaction conditions are relatively strong, which may lead to changes in coal quality

[0016] To sum up, although physical desulfurization is economical and the process is simple, it can only remove inorganic sulfur in coal, but cannot remove organic sulfur; and although chemical desulfurization can remove almost all inorganic sulfur and most organic sulfur, but The process is complex and often needs to be carried out under certain acid-base conditions, and sometimes even requires a higher temperature, which has a greater impact on the properties of the coal, such as causing poor coal cohesiveness and lower calorific value.

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