Two-section dry-type magnetic separation purification process before combustion of pulverized coal

Abstract

The invention discloses a two-section dry-type magnetic separation purification process before the combustion of pulverized coal; the process comprises the step that after sampling is carried out by a ball mill, coal used for power generation firstly enters a coarse separator firstly and the process is characterized by also comprising the steps as follows: granule pulverized coal meeting the requirements of combustion granularity by the coarse separator directly enters a fine powder separator while the coarse powder burning coal is delivered to a microwave mixer, and treated simultaneously by adding a magnetic seed and a catalyst, and then conveyed to a first-section magnetic separator to carry out desulfurization and ash removal after treatment, later, cleaned coal after magnetic separation is returned to the ball mill again, and then tail coal is separated out; micro-powder fine coal which is separated out by the fine powder separator is directly conveyed to a burner while qualified pulverized coal which is separated out enters another microwave mixer, and also treated simultaneously by adding the magnetic seed and the catalyst, and then conveyed to a second-section magnetic separator to carry out desulfurization and ash removal after treatment, later, cleaned coal after magnetic separation is delivered to the burner for combustion, and then tail coal is separated out; and the process has the advantages of high efficiency, quick effect, energy conservation and electricity conservation, cleanness and safety, and good desulfurization effect.

Description

Technical field: [0001] The invention belongs to the technical field of pulverized coal desulfurization. Background technique: [0002] Coal provides 75% of my country's industrial fuel, 76% of power generation energy and 80% of civilian commercial energy. Coal occupies the most important position in my country's primary energy consumption structure. However, coal emits a large amount of SO during the combustion process. 2 Gas, which accounts for about 85% of the pollutants emitted by coal combustion, so the prevention and control of coal combustion SO 2 Pollution is an important and urgent task at present. Current coal-fired SO 2 Pollution control technologies can be divided into three categories according to the sequence of implementation: pre-combustion, mid-combustion and post-combustion. Pre-combustion desulfurization mainly reduces sulfur and ash through gravity separation, flotation, magnetic separation and chemical, microbial desulfurization and other desulfuriza...

AI Technical Summary

Problems solved by technology

The current dry-type high-gradient magnetic separation technology for pulverized coal has the outstanding problems of easy clogging of the magnetic gathering medium and small processing capacity of the equipment, so there is no report of industrial application so far

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