Two-stage rotary oxygen-enriched external heating oxidation process and device for dry and semi-dry desulfurization ash

Abstract

The invention relates to a two-section rotation oxygen-enrichment external heating oxidation technology and device for dry-method and semi-dry method desulfurized ash. A two-section type rotation oxidation kiln is adopted, oxygen is introduced into the kiln and heating is implemented by adopting an external heating furnace, so that the oxidizing process for converting CaSO3 in the desulfurized ash into CaSO4 is completed. Compared with the prior art, the technology and the device have the benefits as follows: (1), during the oxidation of the desulfurized ash in the oxidation kiln, stable oxidation time, balanced oxidation temperature, sufficient oxygen content and appropriate oxidation atmosphere are realized, the technical measures such as automatic control, surplus heat utilization, dust removal and environment protection are adopted, so that the low-cost oxidation and industrialized production are realized; (2), the provided systematic desulfurized ash oxidation production line is suitable for the industrialized and large-scale production requirements; (3), the processing parameters such as oxidation temperature, time and oxygen content are controlled through a PC (Personal Computer), so that the appropriate oxidation conditions are ensured; (4), the promotion of the development of a dry-method and semi-dry method desulfuration technology is facilitated; (5), the resource utilization of the desulfurized ash is realized, and the energy conservation, emission reduction and environment protection are facilitated.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of by-products of dry and semi-dry flue gas desulfurization, in particular to CaCO in dry and semi-dry desulfurization ash 3 Oxidation treatment process and equipment. Background technique [0002] my country is a big country of coal production and consumption, and also a SO 2 big emitters. National Industrial SO 2 50% of the emissions come from coal-fired power plants, 11% from the iron and steel industry, and 70% of the emissions from the iron and steel industry come from ore sintering. 2 Emission reduction is important. [0003] At present, my country's flue gas desulfurization mainly adopts wet, dry and semi-dry processes, of which dry and semi-dry processes include rotary spray drying absorption (SDA), circulating fluidized bed (CFB), and calcium spraying furnace in the furnace. After flue gas humidification and activation method (LIFAC), and MEROS method, NID method, et...

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Problems solved by technology

[0006] The present invention overcomes the CaSO in dry and semi-dry desulfurization ash in the prior art 3 Oxidation has the disadvantages of long oxidation time, low efficiency, high energy consumption and cost, and difficulty in industrialization and large-scale production. It provides a dry and semi-dry desulfurization ash with low energy consumption, low cost, and suitable for industrial large-scale production. Segment rotary oxygen-enriched external heating oxidation process and supporting equipment

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