A method for regenerating granular activated carbon by arc initiation and discharge includes steps of the granular activated carbon continuously flowing through a heating passage, and applying a DC (direct current) to two electrode plates in the heating passage. Under a combined action of conductive Joule heating and arc heat release, the activated carbon heats up rapidly and an adsorbate is pyrolyzed by high temperature, thereby achieving regeneration. Moreover, a device for regenerating granular activated carbon by arc initiation and discharge includes a feeding device, a heating passage, an aggregate device and an adjustable DC power supply. Two ends of the heating passage are connected with the feeding device and the aggregate device respectively; two electrode plates are provided within the heating passage; the two electrode plates are connected with an output positive pole and an output negative pole of the DC power supply respectively.

Method for generating heat energy comprising supplying electrical energy to a heating element where the heating element heats a negatively charged cathode, electrons are emitted from the heated cathode towards a positively charged anode through a positively charged grid, wherein the positively charged grid is provided with greater charge potential value that the anode and the anode is forced to constantly generate heat energy, wherein at least part of the cathode, the positively charged grid and at least part of the anode are provided in hydrogen gas filled chamber of a container. A device for carrying out said method is also disclosed.

A rectifier arrangement includes at least one input alternating voltage terminal to which an alternating current can be supplied, at least two output direct voltage terminals at which direct current can be tapped and at least one series circuit with at least two sub-modules connected in series. Each sub-module of the series circuit includes at least one converter module, an inverter module and a transformer module. Each sub-module of the series circuit additionally includes a rectifier module. The outputs of the rectifier modules are connected in parallel and form the output direct voltage terminals of the rectifier arrangement.

A rectifier arrangement includes at least one input alternating voltage terminal to which an alternating current can be supplied, at least two output direct voltage terminals at which direct current can be tapped and at least one series circuit with at least two sub-modules connected in series. Each sub-module of the series circuit includes at least one converter module, an inverter module and a transformer module. Each sub-module of the series circuit additionally includes a rectifier module. The outputs of the rectifier modules are connected in parallel and form the output direct voltage terminals of the rectifier arrangement.

A method of detecting an open arc in a DC plasma arc furnace which is based on detecting a linear decrease in the log of the magnitude of the frequency spectrum of the voltage between the anode and cathode.

A method of detecting an open arc in a DC plasma arc furnace which is based on detecting a linear decrease in the log of the magnitude of the frequency spectrum of the voltage between the anode and cathode.

A method for providing a region of inert gas around the electrodes in an electric arc furnace is provided. This electric arc furnace includes consumable graphite electrodes, a melting zone, and at least one lance including an inlet and an outlet, wherein the inlet is connected to a liquid inert fluid source. The method includes introducing the consumable graphite electrodes into the melting zone, wherein the distal ends of the electrodes form arcs with a solid charge of scrap metal. The method also includes introducing the liquid inert fluid into the inlet end of the at least one lance, wherein the inert fluid exits the outlet end and is introduced into the melting zone proximate to the distal ends of the electrodes, thereby providing an inert gaseous blanket, once the liquid vaporizes, around the distal ends of the electrodes

A joining method for connecting a first component to a second component without pre-punching. The first component and the second component are positioned relative to one another prior to the connection by an auxiliary joining element, which is joined via a joining device to the components positioned relative to one another. The auxiliary joining element firstly passes through the first component without pre-punching and is then connected to the second component without pre-punching. Before the components are connected by the auxiliary joining element, the first component is thermally pre-treated at the joining area via an electric arc formed between the first component and an electrode of the joining device. A heat-affected zone is formed on the first component in the joining area, and the first component in is weakened or melted in the heat-affected zone.

A joining method for connecting a first component to a second component without pre-punching. The first component and the second component are positioned relative to one another prior to the connection by an auxiliary joining element, which is joined via a joining device to the components positioned relative to one another. The auxiliary joining element firstly passes through the first component without pre-punching and is then connected to the second component without pre-punching. Before the components are connected by the auxiliary joining element, the first component is thermally pre-treated at the joining area via an electric arc formed between the first component and an electrode of the joining device. A heat-affected zone is formed on the first component in the joining area, and the first component in is weakened or melted in the heat-affected zone.

A method for operating an electric arc furnace having at least one electrode, the method including the following steps: introducing material that is to be melted in the form of an actual mass flow into the electric arc furnace and feeding electrical energy via at least one electrode into the electric arc furnace in order to melt the introduced material depending on a previously determined, necessary electrical energy input. The necessary electrical energy input into the arc furnace is determined depending on the mass flow input into the furnace.