On-line heating process of oxidation and desulfurization ash by using flue gas of power generation boiler or sintering machine

Abstract

The invention relates to a process for online heating of oxidized desulfurization ash by using the flue gas of a power generation boiler or a sintering machine. The high-temperature flue gas of a power generation boiler or a sintering machine is used as the heat source of the heating furnace of the process system, and at the same time, the waste heat of the flue gas of the heating furnace is recovered to heat the air into The desulfurized ash in the two-stage rotary oxidation kiln is preheated, and the flue gas of the heating furnace after heat exchange and the waste heat of the finished product cooling chamber are sent back to the combustion air system of the power plant or sintering plant for use as combustion air. Compared with the prior art, the beneficial effects of the present invention are: 1) make full use of existing resources and avoid waste caused by repeated construction; 2) facilitate the on-line oxidation of desulfurization ash produced by power plants or sintering plants through technological transformation Modification treatment, and less investment, low energy consumption, low operating costs, and suitable for industrial and large-scale production. 3) The oxidized desulfurization ash can be directly used in building materials, construction and decoration industries, which is beneficial to energy saving, emission reduction, land protection and environmental protection; 4) The economic benefits are considerable after application.

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...

AI Technical Summary

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 properties have not changed, the amount of addition is very limited, and the resource utilization and large-scale utilization of desulfurization ash have not been realized

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