(1) high temperature: under the action of high temperature, some organic substances depolymerize to form combustible gas;
(2) anoxia: in the process of high temperature treatment, limited combustion is realized by limiting oxygen supply;
(3) Low moisture content: waste (such as sludge) should be reduced in moisture content (pre-drying) before pyrolysis;
2. Hydrothermal drying: it is equivalent to cooking meat in a pressure cooker, which is cooked quickly. Mature sludge has good dehydration performance and can be dehydrated to semi-dry state by mechanical force.
Concrete analysis of hydrothermal drying
Hydrothermal drying sludge treatment technology is to break the cytoplasm of sludge through hydrothermal drying after sludge is concentrated, thus breaking through the technical bottleneck that sludge is difficult to dehydrate. Hydrothermal drying technology can improve the dewatering performance of sludge, sterilize and decompose organic matter, recover biomass energy, achieve the purpose of reduction, harmlessness and resource utilization, and greatly reduce operating costs and treatment energy consumption.
Combined technology of hydrothermal drying sludge treatment realizes system optimization through the combination of mechanical concentration, hydrothermal reaction, secondary concentration, dehydration, heat exchange between hot and cold sludge, incineration and other technologies, further improves the overall treatment efficiency of the system, reduces the content of harmful substances in sludge, reduces the water load of subsequent dehydration treatment, reduces the energy consumption of hydrothermal treatment, and increases the calorific value of decalcified cakes.