The concept of hazardous waste incineration in a rotary kiln was developed more than 40 years ago and is still an ideal method for incinerating hazardous waste for throughputs of more than 2 t/h. All types of waste and special waste can be treated here, irrespective of contamination, calorific value and consistency. Due to the high incineration temperatures of more than 1,100° C, rotary kilns are mainly used for special waste incineration. At two seconds above this minimum temperature, all organic substances are safely destroyed. Furthermore, incineration provides the possibility to gain energy in the form of steam or electricity from polluted, contaminated and mixed waste.
The concept of classic special waste incineration with a rotary kiln plant involves separate waste storage, feed devices for all types of waste, the rotary kiln, a secondary combustion chamber, a heat recovery steam generator, and flue gas cleaning.
Our rotary kilns are up to twelve metres long, with a diameter of up to five metres. The lining with refractory bricks enables them to be operated at the high temperatures that prevail there. Lengthwise, the rotary kiln is inclined slightly to allow the transport of the waste and slag. Bulky solid materials, barrels and containers, paste-like, liquid and gaseous waste can be incinerated in the rotary kiln. The waste is fed directly in at the front of the rotary kiln either by means of a conventional waste feed chute, an automatic barrel lift for containers, or a lance for gaseous, liquid or paste-like waste. Depending on suitability or calorific value, liquid and gaseous waste can also be fed into the secondary combustion chamber. The high temperatures and rotation of the waste during incineration generate a sintered to vitrified slag in the rotary kiln.
In the secondary combustion chamber, which is downstream from the rotary kiln, full post-combustion of the combustion gases, and thus also residual organics and entrained solid particles, takes place. Suitable liquid waste and gaseous pollutants are introduced at the beginning of the secondary combustion chamber, to ensure that this waste is also burned off completely. The rotary kiln and the secondary combustion chamber form an interrelated system with two-stage combustion, which allows the treatment of special waste with strongly varying consistencies.
Steinmüller Babcock Environment plans, constructs and supports turnkey special waste incineration plants. These plants are designed according to individual requirements. We guarantee a highly developed technology that has proven its worth in countless applications. Our thermal treatment uses the energetic potential of the special waste to extract steam, electricity and heat, while at the same time guaranteeing safe and environmentally-friendly disposal.
An alternative for disposing of hazardous waste is gasification and melting with the Direct Melting System (DMS). Talk to us, we will be happy to explain which system presents the best solution for you.