Charcoal burning kilns are units that operate at rather high temperatures; the pyrolysis process is composed of complex chemical reactions. We pay particular attention to the basis of this equipment design. This basis is made by three elements: correct calculations, correct selection of materials, and correct manufacturing technique. Based on these “three pillars”, we manufacture kilns that operate and fit for their purposes, are easily controlled and monitored, and are reliable and durable.
All our models, being similar in appearance and processes, actually have a subtle, but deep difference. We do not manufacture one model and we do not declare that it can control both dry (relative humidity of up to 25 %) and wet feedstock (newly felled) such as briquettes and small-sized wood. We propose different models of charcoal burning kilns for each type of feedstock, which fit perfectly for set targets and solve them successfully.
Our basic model is ModEco 4-60 kiln
It is used to char the feedstock with a moisture content of up to 25 % and at least 50 mm in size. Its basis is primarily accurate calculations. Accurate calculations of all the units and their fitness for the processes in various kiln sections allowed developing a computer program to control the kiln. In general, the ACS (automated control system) and the kiln corresponding to the calculations became the product, which is the dream of charcoal burners.
To char large-sized wood with a moisture content exceeding 25 % (this is often freshly felled wood with a moisture content of up to 70 %), we propose the ModEco 4-60 PS model.
This kiln is completed with a drying complex, with two-stage drying of wood. The heat transfer medium proven in the kiln is used for preliminary drying of wood. Wood is dried by the “through layer” method, which is most efficient. The heat transfer medium is supplied to each wood piece and purges the piece with heat that entrains the moisture from the feedstock
The correctly designed drying complex eliminates moisture condensation. The kiln control software has been developed for new conditions and includes not only the automated control system for the kiln, but also automatic control of temperatures for the heat supplied to the drier.
Many charcoal burners still char coco shells by the very ancient and not always environmentally friendly and technically feasible method. We received an order from one of the countries in the South-East Asia for the design of a high capacity kiln, which could operate successfully with the use of such feedstock, considering the climatic conditions in this locality. This made us design the ModEco 4-60 CS model specifically for the coco shell charring. It was tested successfully at our site.
As against the basic model, this kiln for coco shell charring required multiple modifications. Below are some of them:
Flue gas ducts have been modified (the wet equatorial climate made own adjustments to the calculations).
The kiln was additionally completed with retort extension pieces (the feedstock charge method must be safe).
The automatic control program was completely changed. Due to the completely different operating procedure, the program was adopted for both new process requirements and the language demands of staff.
We are also designing a Pini Kay kiln for briquette charring. The process at the initial stage now, so it is early to present a new model. As the early models, it will not pass an easy way, from a pilot sample to a prototype. We wish it to pass this thorny and difficult way and become a good, stable model as three previous ModEсo units.