32 results about "Trace heating" patented technology

An electrical installation for an electrical system for trace heating a fluid transport pipe (8) made of metal, at least one polyphase circuit having three main electric cables (6-1, 6-4, and 6-7) in a star connection, and one additional electric cable (6-2, 6-3, 6-5, 6-6, 6-8, and 6-9), the main cables and the additional cable positioned around the pipe and connected at the pipeline end to a common connection ring (10) forming a point of zero electric potential, and detector for detecting a failure, if any, of the polyphase circuit to identify a failed main cable in order to replace it with the additional cable.

A skin effect heating system for long pipelines includes a heater cable disposed in a ferromagnetic or other conductive heat tube. A semiconductive jacket contacts the inner surface of the heat tube, where the charge density of the return current carried by the heat tube is at its highest. The semiconductive jacket material has a resistivity that is sufficiently low to reduce or eliminate arcing events such as corona discharge by allowing accumulated charge on the heat tube to dissipate. The resistivity is also high enough to prevent the return current from flowing into or through the semiconductive outer layer, so that heat production capacity of the system is maximized.

The present invention is related to the separator for separating solid particles from a vapour-gas mixture, and particularly to the structure of a dust chamber (2) as installed in the plant for processing fossil fuels or materials containing organic matter. The dust chamber (2) comprises a main body (4) having an inlet (14) for a vapour-gas mixture containing semi-coke particles and an outlet chute (9) for removal of semi-coke particles, wherein the upper part of the main body (4) is connected to the inlet of a cyclone (3) for removal of fine semi-coke particles from the vapour-gas mixture and wherein a screw conveyor unit (13) is connected to the bottom part of the main body (4). Said main body (4) is covered with an external insulation (5). Electrical trace heating cables (7) are in contact with the external surface of the main body (4) of the dust chamber (2).

The invention relates to a flashing and pressure holding combined retention tower electric tracing heating temperature holding modified pitch production technology. The production technology is a single-heat production technology, only one tube furnace is adopted for heating in the process, energy-saving effect is remarkable, and flashing separation and continuous heating temperature holding thermal polymerization are combined. Flashing separation is conducted firstly on pitch, then oxidization thermal polymerization is conducted by controlling electric heating temperature holding accurately, an obtained target product meets the requirement of the carbon industry for pitch better, cohesiveness is excellent during mixed kneading of a carbon element mixture, and coking value is higher after roasting.

The invention discloses a method for determining setting depth of a heating cable passing a hollow sucker rod. The method is applied to high-solidification-point high-wax-content crude oil wells of oil fields, and the heating cable is enabled to go down into a hollow of the hollow sucker rod for heat-tracing heating oil production. The method includes collecting oil well parameters and technical parameters of the hollow sucker rod waiting for being set; building a conventional oil pumping well temperature drop model and a heat-source oil pumping well temperature drop model; constructing according to setting depth calculated by the models, and checking polished rod load of an oil pumping machine. The method has the advantages that under the premise that maximum polished rod load of the oil pumping machine is met, normal production of oil wells larger than 35 DEG C in solidification point; thermal washing and chemical adding are not needed, effective time efficiency of the oil wells is improved by 10% averagely, production and running cost is saved, and labor intensity of staff is reduced.

The invention discloses an electric tracing heat preservation device for a cold region underground pipeline device. The electric tracing heat preservation device comprises electric tracing heating cables, a heat preservation protective layer and a temperature monitoring system. The electric tracing heating cables are laid along a pipeline, the heat preservation protective layer is arranged on the outer side of the pipeline, the temperature monitoring system is connected with the electric tracing heating cables, and temperature sensors of the temperature monitoring system are tightly attached to the outer wall of the pipeline. The heat preservation protective layer is composed of a composite silicate heat insulating layer, a glass cloth composite aluminum foil damp-proof layer and an aluminum alloy sheet protective layer. The temperature monitoring system comprises the temperature sensors and a comprehensive control device. The temperature sensors are connected with the comprehensive control device through connection terminals. Thermistors serve as the temperature sensors and are tightly attached to the outer wall of the pipeline, and each electric tracing heating cable is matched with two temperature sensors. The temperature monitoring system achieves remote monitoring, any failure of the electric tracing heat preservation device is found in time, and safety running of the cold region underground pipeline device is ensured.