Q=8-10t/h P=1.3MPa T=193℃ Parameters and process of membrane wall waste heat boiler

 (1) Process description

After leaving the secondary combustion chamber, the high-temperature flue gas enters the waste heat boiler. On the one hand, heat energy can be recovered for industrial production,

On the other hand, the flue gas temperature is reduced to ensure the use of subsequent equipment. According to the "Technical Specifications for Centralized Incineration and Disposal of Hazardous Waste Project Construction" implemented on May 24, 2005, the flue gas of hazardous waste incineration needs to be cooled rapidly at 200-500°C, that is, the temperature at the outlet of the waste heat boiler must be greater than 500°C. The flue gas temperature is designed to be 500°C.

The heat source of the boiler comes from the flue gas discharged from the incineration of hazardous waste. The temperature of the boiler feed water is 104°C. The working medium directly enters the drum, and then leads out from the drum, and flows into the membrane water wall through the downcomer. The steam temperature reaches 183°C. The flue gas enters the radiation heat exchange chamber of the large space of the waste heat boiler from the combustion chamber of the incinerator through the flue. The dust concentration reduces the pressure on the dust collector. Avoid the most sensitive temperature range of HCl gas to the high temperature corrosion of the convection heating surface, which can avoid the relative reduction of HCl corrosion.

The waste heat boiler consists of a drum, a radiation heat exchange area, a convective heat exchange area, ash cleaning device, platform support and ash discharge system.

waste heat boiler

(2) Design parameters

1. Rated evaporation capacity: 8t/h;
2. Rated steam pressure: 1.25MPa;
3. Saturated steam temperature: 183°C;
4. Feed water temperature: 104°C;
5. Exhaust gas temperature: 500～550℃;
6. Setting type: membrane water wall radiation heat exchange;
7. Furnace tube wall thickness: 5mm (consider corrosion allowance to prolong life).