Abstract:
Method for burning a fuel in a wood stove having a door to a combustion chamber with a base, which combustion chamber is isolated from the air by an exhaust and an intake at which intake there is provided an air regulator having at least primary, secondary and tertiary air intake ducts, wherein the stove ins controlled by a burn controller configured to operate between the different operating, i.e. different combustion states.
Abstract:
A control system for an incineration plant, comprising an incineration furnace with a combustion path along which the material to be burned is transported, air supply means, a steam generator, and control means with a steam controller and an oxygen controller which, depending on respectively the generated amount of steam and the oxygen in the furnace, generate control signals for adjusting the size and/or speed of a stream of material in the furnace and/or for adjusting the air supplied. The control signals control the generated amount of steam to a first adjusting value and via air supplied the amount of oxygen to a second adjusting value. The steam controller controls a summing device which forms a sum signal used which via calculating means modifies the output signals of control circuits controlled by the output signal of the oxygen controller for the air supply to the furnace and/or the size of the supply stream of material to the furnace and the speed of the stream of material through the furnace respectively, to obtain definitive control signals.
Abstract:
A gas burner (10) and method of controlling burning, the gas burner (10) including a controller disposed in a control cabinet (10), a burner cabinet (14), an actuator (16) and a blower (18), the blower (18) being fuidly coupled to the burner cabinet (14). The gas burner (10) has an air valve (40) that is operably, fluidly coupled to both the burner cabinet (14) and the blower (18) for controlling the flow of air from the blower (18) to the burner cabinet (14). A gas valve (36) is fluidly coupled to a source of gas for controlling the flow of gas from the source of gas. An actuator (16) is communicatively coupled to the controller and is linearly coupled to the air valve (40) and the gas valve (36) for simultaneously linear actuation thereof responsive to commands from the controller.
Abstract:
A method for operating a boiler with a deposited fuel bed and a movable grate is disclosed. The method for operating the boiler (10) comprises determining the desired output power of the boiler (10) and the amount of fuel, while adjusting the flow rate of a primary air flow (18) depending on the output power and the measured stoichiometric excess of oxygen, incrementally adjusting the bed height and continuously adjusting the speed of the grate. The method further comprises determining a recycling rate for the flue gas (34) exiting the boiler, and mixing the collected flue gas with the primary air so that the resulting mixture flows at a rate corresponding to the recycling rate. The method is useful for reducing the nitrogen oxide (NOx) content of boiler flue gas.
Abstract:
A method is shown for controlling the oxidation and calcination of waste foundry sands during a thermal reclamation process. The waste sands are passed to a calcining chamber having a floor, connecting sidewalls and a top. The floor of the calcining chambers provided with a plurality of vents. The calcining chambers also connected to a separate firebox which produces fluidizing hot gases for fluidizing waste sands within the calcining chamber and forming a fluidized sand bed. The fluidizing hot gases are introduced into the calcining chamber by means of the floor vents. By precisely controlling the temperature of the waste sands within the fluidized bed, a more consistent product is produced while maintaining the temperature of the waste sands below a critical temperature at which the organic binders present on the sand grains would be fused to the waste sand grains.
Abstract:
A combustion furnace and a method of its operation are described. The furnace comprises a chamber defining a combustion volume having at least one primary inlet for fuel and combustion supporting gases and at least one primary outlet for combustion product gases, which chamber is provided with one or more additional ports, for example in fluid communication with a supply of gas for secondary gas flow, allowing for secondary gas flow into and/ or out of the combustion volume.
Abstract:
Изобретение относится к энергетике и может быть использовано при разработке и эксплуатации энерготехнологических котлов. Суть изобретения в том, что осуществляют подачу топлива и воздуха и сжигание в топочной камере и камере дожигания котла, а при отводе продуктов сгорания из камеры дожигания делят их на два потока, первый поток направляют для охлаждения в теплообменник, а второй - в байпас, куда направляют дополнительный поток воздуха. Кроме того, предложена система управления работой котла, в которой блок управления соединен на входе с датчиком температуры, газоанализатором, регулятором подачи воздуха и топлива на горение, а на выходе - с регулятором подачи воздуха на смешение с продуктами сгорания, проходящими по байпасу. Такое выполнение котла уменьшит температурные нагрузки на байпас и стабилизирует температуру и состав продуктов сгорания на выходе из котла.
Abstract:
A method and/or apparatus for efficiently operating a combustion device including at least one control zone, with each control zone including at least one burner assembly, is disclosed and includes a) individually supplying fuel to each of the burner assemblies in each of the control zones, b) individually measuring a separate combustion characteristic of the collective combusted gas from each of the burner assemblies in each of the control zones, and c) individually adjusting the flow of air to each of the burner assemblies in response to the value of the combustion characteristic corresponding to each of the control zones to keep the value of each separate combustion characteristic within a predetermined range. In a preferred embodiment, primary air and secondary air are separately supplied and controlled to each of the burner assemblies in each of the control zones in response to the value of the combustion characteristic corresponding to each of the control zones.
Abstract:
A waste incinerator, comprising a combustion chamber for combusting waste, a plurality of sonic gas temperature measuring instruments, a means for estimating a temperature distribution in the combustion chamber, a means for recognizing block addresses, a means for estimating a temperature distribution in each block address, a comparison means for comparing the temperature distributions, a control means for controlling a gas temperature, and a waste heat boiler, wherein a gas temperature distribution in the waste heat boiler is measured by the temperature measuring instrument, and combined with the block addresses in the waste heat boiler.
Abstract:
The control of furnaces requires not only that the combustion-air supply be high enough for sufficient oxygen to be available for combustion, but also that the quantity of combustion air be as close as possible to the minimum possible amount for combustion in order to avoid an unnecessary surplus of air. The invention disclosed thus concerns a furnace control device which uses as its command or control variable the concentration of unburnt material in the flue gases. This concentration can be determined by means of simple prior art fire-alarm sensors, for instance.