Process for on-line heating and oxidation of desulfurized fly ash by virtue of flue gas from power generating boiler or sintering machine

Abstract

The invention relates to a process for on-line heating and oxidation of desulfurized fly ash by virtue of flue gas from a power generating boiler or a sintering machine. The high-temperature flue gas from the power generating boiler or the sintering machine is adopted as a heat source for a heating furnace of the process system and meanwhile the waste heat of the flue gas from the heating furnace is recovered so as to preheat the desulfurized fly ash inside a two-section type rotary oxidation kiln and the heat-exchanged flue gas of the heating furnace and the waste heat of the finished product cooling bin are sent back to the combustion air system of the power generating boiler or the sintering machine together to be used as combustion air. Compared with the prior art, the process has the beneficial effects that: (1) the existing resources are fully utilized and the waste caused by the repeated construction is avoided; (2) by virtue of the process, the on-line heating oxidation and modification treatment of desulfurized fly ash generated in the power generating plant or a sintering plant are facilitated by virtue of the technological reconstruction, the investment is low, the energy consumption is low, the operating cost is low and the process is suitable for industrial and scale production; (3) oxidized desulfurized fly ash can be directly applied in industries, such as building materials, construction and decoration which is beneficial to the energy conservation and emission reduction and the protection of the land and environment and (4) economic benefits are considerable after the process is applied.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of dry and semi-dry flue gas desulfurization by-products, in particular to a desulfurization ash oxidation process based on an externally heated two-stage rotary kiln. 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, the flue gas desulfurization methods used in industrial production at home and abroad can be generally divided into three categories: wet process, dry process and semi-dry process. Dry and semi-dry flue gas desulfurization technology with CaCO 3 or Ca(OH) 2 It is a desulfurization agent, and the by-product is light white dry powder, w...

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Problems solved by technology

Some are directly used to produce various building materials without treatment, but due to the influence of CaSO in desulfurization ash 3 The physical and chemical pro

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