Process system of sludge incinerator
Sludge incinerator is a common sludge disposal method, which can destroy all organic matter, kill all pathogens, and minimize the volume of sludge. The sludge with a relative water content of about 75% is only 10% of the original volume. When the burning calorific value of the sludge is high, the demand for urban sanitation is higher, or the content of toxic substances in the sludge is high. Sludge can not be used in the comprehensive utilization of sludge and can not be used in sludge incineration treatment. Before sludge incineration, dehydration and thermal drying should be carried out to reduce load and energy consumption, and corresponding flue gas treatment facilities should be established to ensure flue gas emissions. At present, sludge incineration is incinerated by waste incinerators, incineration of industrial furnaces, incineration of coal-fired power plants and sludge incineration.
The sludge incinerator consists of three subsystems: pretreatment, combustion, flue gas treatment and waste heat utilization. In the aspect of pretreatment, the main requirements are the requirements of pretreatment and the application of pre drying technology. The main raw materials of sludge incineration system are dewatered sludge cake, and the pretreatment process includes concentration, conditioning, digestion and mechanical dehydration. In view of the requirement of incineration on the calorific value of sludge, the incinerated sludge should not be digested again. The selection of sludge dewatering agent should not only consider its influence on sludge calorific value, but also consider the influence of combustion equipment safety and combustion transfer conditions. Therefore, caution should be made to the strong corrosion of the ferric chloride stabilizer. Lime has the function of improving sludge incineration conversion rate. Yes. Pre-drying is very helpful to the self-sustaining combustion of sludge incineration. The pre-drying unit technology has been applied to the new large-scale sludge incineration device 1990.
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