This article presents a mathematical model of cold gas-solid two-phase flow which is based on the cement rotary kiln in service. By altering the parameters of air supply system of fourchannels pulverized burner, investigations are taken of that motion trajectory and particle distributions in the very turbulent field. The results show that motion trail of most particles in rotary kiln is a combi...

In the Refractories world three decades ago, very few people were acquainted to silica fume and its usage. After a few years, it was used as an additive to brick. When added to high Alumina brick, mullite was formed in the matrix of the brick on firing, giving the brick good volume stability, strength and chemical resistance. When used in basic brick, high hot strengths resulted, at least at 27...

Rotary kilns are widely used for the thermal treatment of highly toxic waste. The waste (mostly organic compounds) is packed in barrels before it is fed in the kiln. Depending on the compound the heating inside the kiln leads to deflagrations of the barrels associated with an incomplete burnout. In this paper we present a new method to detect and track waste barrels in infrared image sequences ...

A one-dimensional mathematical model was developed for the simulation of limestone calcination in rotary kilns. The model is comprised of ordinary differential equations derived from mass and energy conservation principles. The system of equations is solved by a fourth-order Runge-Kutta method. The model predicts, in the axial direction, temperature profiles for the bed of particles, the gas ph...

An r-graph is an r-regular graph where every odd set of vertices is connected by at least r edges to the rest of the graph. Seymour conjectured that any r-graph is r + 1edge-colorable, and also that any r-graph contains 2r perfect matchings such that each edge belongs to two of them. We show that the minimum counter-example to either of these conjectures is a brick. Furthermore we disprove a va...

This paper investigates the combined effect of kiln or brick surface roughness and lattice setting density on fluid flow heat transfer characteristics in tunnel kilns. The uniformity, pressure drop, convective coefficient (CHTC), pumping power are studied. A high-density (HDS), which comprises 768 bricks, a low-density (LDS), 512 tested for boundaries levels 0, 1, 2, 3, 4 mm. investigation is c...

PT. Semen Indonesia Tbk. (Persero) merupakan salah satu pabrik yang menghasilkan semen sebagai bahan baku pembangunan atau konstruksi dari skala kecil sampai proyek besar, mana utama 80% batu kapur, 15% tanah liat dan 5% campuran lainnya. Dimana terdapat beberapa proses terjadi meliputi crusher, raw mill, kiln, finish mill packing. Proses kiln adalah bagian pembentukan setengah jadi. Kiln digun...

This paper presents the modular robotic system SafeBot to air autonomous nuclear security applications. This research serves many Department of Energy applications for inspection and surveillance in hazardous areas. Currently four kinds of sensors are available through the SafeBot robotics system: laser ranger sensor brick, thermal sensor brick, visual sensor brick and gamma and neutron sensor ...