Sludge steam conditioning and high-dryness dewatering coupled incineration integrated method and device

Abstract

The invention discloses a sludge steam conditioning and high-dryness dewatering coupled incineration integrated method and device, and belongs to the technical field of sludge dewatering incineration.The problems that the investment is large in a conventional sludge dewatering and incinerating process, the operation cost is high and the like are solved; the method comprises the steps: sludge withthe water content of 80%, water and a hardening and tempering agent PAM (1-2% tDS) or PAC (4-5% tDS) are added into a mixing and stirring tank and uniformly stirred, the sludge with the water contentof 90% is obtained, and then the sludge with the water content of 90% is fed into a steam heating tank and is heated to 90-100 DEG C; then the sludge with the water content of 90% and with the temperature of 90-100 DEG C is fed into a high-pressure plate-and-frame filter press and is subjected to filter press dewatering under the pressure of 5.0 MPa, and a sludge filter cake with the water content of 30-35% is obtained; and finally, the sludge filter cake with the water content of 30-35% is crushed, then is fed into a fluidized bed incinerator and is subjected to self-sustaining incineration.The device comprises the mixing and stirring tank, the steam heating tank, the high-pressure plate-and-frame filter press, the fluidized bed incinerator, a spray tower and a waste heat boiler; the method and the device are used for sludge dewatering incineration.

Description

technical field [0001] The invention belongs to the technical field of sludge dehydration and incineration, and in particular relates to an integrated method and device for sludge steam conditioning and high-dry dehydration coupled incineration. Background technique [0002] At present, most sewage treatment plants use stacked screw sludge dewatering machines or belt filter presses for sludge dehydration, and the moisture content of sludge after dehydration is about 80%. This kind of sludge has high water content and low calorific value. In order to adapt to the subsequent dry incineration treatment, it is necessary to further dehydrate the sludge with a water content of 80% to below 60%. This requires the addition of more conditioning agents, such as PAM (1-5%tDS) or PAC (2-5%tDS), FeCl 3 (8-10%tDS) and a large amount of CaO (20-30%tDS), the dewatered sludge can reach a water content of about 60% through the plate and frame filter press. This not only consumes a large amo...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the above-mentioned problems of large investment and high operating cost in the current sludge dehydration and incineration process, and provides an integrated method and device for sludge steam conditioning and high-dry dehydration coupled incineration. The technical scheme is as follows:

Images