Abstract: With the system of the present invention, high sulfur content coal—a mixture of coal, sulfur compounds and ash (e.g., stone and slate)—is crushed, and a proportion of the higher density sulfur compounds and ash are separated from the lower density coal. The result of the separation process, the continuous supply of the separated coal mixture, is then continuously monitored for sulfur content. The system uses electronic controls to vary the proportion of sulfur compounds and ash which are separated out and removed from the coal mixture so as to maximize the economics of reducing the sulfur content, and of generating power. A centrifugal separator is used for continuously separating the relatively dense high sulfur content coal and ash from the coal mixture. This separator preferably has a substantially rotationally symmetric drum element which rotates about a horizontal central axis.

Abstract: The present invention makes possible the economic and environmental use of high sulfur coal by removing the sulfur at the power generating plant. This process reduces the risk of fire, explosion, and freezing in storing and transporting reclaimed, ground coal, and moves the reclamation process to the site of the power plant, while providing electronic controls to monitor and adjust the reclamation process to produce controlled feedstock for the power plant.

Abstract: A system protocol for the composite shift key communication of binary signals in which a transmitting transceiver transmits a first summed signal having a first qualifying signal at a qualifying signal frequency Wqt as one of the summed signal components only when a binary signal is desired to be transmitted. The transmitting transceiver ceases transmission of the first qualifying signal Wqt as a transmitted signal or as a component of a composite summed signal when neither a binary zero nor a binary one is desired to be transmitted. The receiving transceiver signals to the transmitting transceiver when the binary signal transmission is being successfully received by transmitting thereto a second qualifying signal Wqr. The receiving transceiver drops the transmission of the second qualifying signal Wqr when the binary signal transmission is not being successfully received, or is being received with perceived errors therein.

Abstract: A Composite Shift Keying (CSK) modulation technique is described which provides enhanced error detection capability in a noisy transmission medium, such as an AC power line. A modulating binary signal causes the generation of two of three possible transmitted signals, and when the modulating binary signal is idle, no signal is transmitted. When the modulating signal is active, a single frequency qualifying signal (of radian frequency Wqt) is transmitted. If the active binary signal is a logical 0, an additional single frequency (of radian frequency W0) is transmitted along with Wqt. If the active binary signal is a logical 1, a different single frequency (of radian frequency W1) is transmitted with Wqt.