Abstract:
The present invention relates to a method of improving the operation of a boiler plant in a chemical pulp mill. At least part of the black liquor flow of the chemical pulp mill is divided into several batches being substantially in a solid form, which are mechanically turned into substantially equal-sized pieces for deeding into the recovery boiler and for combustion taking place therein. Waste liquor batches may be stored prior to the combustion. The invention also relates to a system for carrying out the method.
Abstract:
A thermal dechlorinating apparatus for collected ash, having a vertically elongated cylindrical apparatus body, a collected ash inlet and a collected ash outlet which are provided on the apparatus body and spaced in a vertical direction thereof, an inlet port for heated air provided on the portion of the apparatus body between the inlet and the outlet, an exhaust gas outlet provided on the portion of the apparatus body above the collected ash inlet, a rotary shaft provided along the axial direction of the apparatus body, a screw provided on the rotary shaft, and heating means provided on the portion of the apparatus body between the collected ash inlet and the collected ash outlet. Heated air is led into the apparatus body through the heated air inlet port. A stirred fluidized layer is formed in the portion of the apparatus body above the heated air inlet port, and a moving layer is formed below the heated air inlet port. Combustibles in the collected ash are burned in the stirred fluidized layer, and partial or entire decomposition and removal of chlorine compounds are performed in the moving layer using the combustion heat generated by burning the combustibles.
Abstract:
The present invention provides a method of processing waste material and a blend stock which provides a suitable fuel and includes the steps of grinding the waste material in a tank containing the blend stock with the grinding being in at least part provided by the coaction between a rotating impeller and a stationary plate so that the degree to which the waste material is ground is controlled by controlling the spacing between the plate and the impeller.
Abstract:
A system for remediating soil containing contaminants. The system comprises a rotary volatilizer, a thermal dust conductor, a soil cooler, a separator and an afterburner. The rotary volatilizer includes a rotatable, counterflow volatilizer drum with a drying zone, a heating zone and a burn zone. The burn zone of the volatilizer has an outer shell and a stainless steel inner liner supported by spring brackets within the outer shell. A separator is provided to receive exhaust gases from the volatilizer and the soil cooler and to remove dust from the exhaust gases. Dust from the separator and hot soil from the volatilizer is introduced into the thermal dust conductor. Hot gases from the thermal dust conductor are returned to the volatilizer to preheat combustion air for the volatilizer and to incinerate contaminants in the returned gases. Soil is transferred from the thermal dust conductor to the soil cooler, where water injection cools the remediated soil and adds moisture to the soil. The cool remediated soil is conveyed from the soil cooler to a load out hopper.
Abstract:
An apparatus for removing viscous material from barrels includes a conventional drum dumper, an auger formed of a double helix of metal ribbon, a motor for rotating the auger, and a carriage assembly for supporting the motor and auger and advancing the auger into and out of an inverted barrel. As the auger is advanced into the open end of an inverted barrel, the motor rotates the auger to insert the double helix into the viscous material and urge the viscous material rearwardly out of the open barrel end. The carriage assembly includes a carriage which supports a central shaft of the auger and the auger motor, and four guide rails which constrain the movement of the carriage to rectilinear motion. The tolerances between the carriage assembly and rails are such that the auger can skew slightly relative to the direction of travel so that the auger can negotiate around a side bung formed on the barrel, and yet provide a relatively close tolerance between the outer periphery of the auger and the inner surface of the barrel. Also, the leading edge of the auger includes cross bars provided with adjustable and/or removable teeth for digging into the viscous material, and the shaft includes a steam supply system for projecting jets of steam and/or other fluids from the sides and ends of the auger to loosen the viscous material. Limits of forward and rearward travel of the frame are controlled by a programmable logic controller.
Abstract:
The present invention provides methods for the reduction and recycling of papermaking sludge. Papermaking sludge is incinerated in a rotary heater, typically a rotary cement kiln, asphalt dryer, or specially designed rotary kiln or incinerator. Aggregate may be combined with the sludge to provide better dispersion of the sludge within the heater, and to facilitate heat transfer. Once in operation, the heat of sludge combustion is added to the process heat, resulting in markedly reduced energy requirements. Papermaking sludge is typically fed continuously into said rotary heater while temperatures in the combustion zone are maintained in the range of approximately 800.degree. to 3500.degree. F. During incineration, mixing catalysts (typically casein or soy protein) and wood fibers are burned, while moisture is evaporated. The resulting product consists essentially of carbonate particles which are collected for subsequent use.
Abstract:
A transportable processing unit for producing a pumpable, essentially homogeneous admixed material suitable for use as substitute fuel or for thermal destruction by incineration, the processing unit including a closed mixing vessel mounted on a movable base member the vessel adapted to receive feedstock material from an adjacent on site holding facility through at least one entry port and to receive intermediate process material through at least one inlet port and a process material exit port as well as a mixing device located in the vessel interior. The processing unit of the present invention also has a conduit for conveying process material away from said mixing vessel, which is connected to the mixing vessel exit port, and at least one particle sizing device mounted on the moveable base member which has an inlet in fluid communication with a second end of the process material conveying conduit and at least one diverter outlet which is in fluid communication with the intermediate process material inlet port of the mixing vessel. The moveable base is preferably a transportable member such as a tractor trailer or a transportation skid.
Abstract:
The present invention relates to a process for restoration of barren land devoid of vegetation or requiring biological recultivation,, wherein the surface of a native ground is covered with a basic layer of semi-liquid recultivation mass prepared on a basis of waste fibrous materials, the layer having thickness of several to several dozens centimeters; in that basic layer there are watering pipes uniformly distributed; after its hardening the basic layer is covered with a top layer of dry mass prepared on a basis of waste fibrous materials, the layer having thickness of several to several dozens centimeters and comprising a hydrogel, adsorbents, as well as plant seeds optionally enveloped with symbiotic mycelium and/or microorganism strains, adjusted to climatic conditions, the character and nature of the native ground, further comprising additives supporting and enhancing vegetation of those plants; and next on the surface of the thus prepared top layer, remaining plant seeds are sown and/or the plants to be cultivated or seedlings thereof are planted; and the degree of wetness of both layers is controlled according to the plants' vegetation phase and climatic conditions prevailing at the recultivated spot of land According to the invention as the additive supporting and enhancing plants' vegetation, there is used a fertilizer in form of cinder(s) and flue gas dust from high temperature process of combustion of pre-segregated and sorted, properly chipped and mixed wastes, in particular municipal wastes, that are unsuitable for a direct use as a soil-forming material, optionally with an addition of very fine grain coal and chemical compounds neutralizing aggressive substances, supplemented with missing nutritive components. The fertilizer is obtained in result of combustion of the above indicated wastes in temperature of minimum 1200°C. The invention relates also to a method for manufacturing a mineral fertilizer, especially for the purpose of land recultivation, in which the properly pre-segregated and sorted, chipped and mixed wastes that are unsuitable for a direct use as a soil-forming material, are subjected to incineration and the thus obtained - and positively verified in the course of respective chemical analysis, cinder(s) and flue gas dust free from any substance adversely affecting natural environment and plants' vegetation are optionally supplemented with missing mineral components, while the heat energy resulting from combustion of pre-segregated and sorted wastes is either utilized directly for the purpose of municipal and/or industrial heating, or cumulated for the future municipal and/or industrial heating purposes.
Abstract:
Methods and systems are disclosed for direct conversion of a used or waste material into a burnable fuel and to burnable fuels derived therefrom.
Abstract:
The disclosure is concerned with generating power using new organic fuel that is generated at wastewater purification plants in the form of sewage sludge with moisture content up to 90-95%. The world supplies this new orgabic fuel in very high quantites that are estimated to be more than 25-40 gr of dry mass/man/day. The new composite fuel comprises a coal suspension with the new dispersed medium, which is the liquid sewage sludge. The composite fuel is introduced into a furnace for combustion and generating power.