Abstract:
The process that is the object of the invention is a process for preparation of biomass mixed with a heavy hydrocarbon fraction for the purpose of supplying a gasification unit with said feedstock. The process according to the invention comprises a first mixing stage followed by a grinding stage and makes it possible to deliver a suspension of biomass particles that are dispersed in the heavy hydrocarbon fraction that is less than 500 microns in size.
Abstract:
The present invention provides a method for treating the wastes of polyester-manufacturing processes. The method of the invention comprises combining the fuel with a first waste byproduct stream to form a combined fuel and first waste byproduct stream mixture that is combusted in a furnace. The present invention also provides certain useful variations of this method in which one or more of the following steps are performed: a second waste byproduct stream is introduced and treated in a regenerative thermal oxidizer, a third waste byproduct stream is introduced and treated in a waste water treatment plant, or a fourth waste byproduct stream is introduced and treated in a fluid bed incinerator. The present invention also provides an apparatus that executes the methods of the invention.
Abstract:
A municipal or like refuse, from which large articles of metals have been removed, is mixed with an alkaline substance like limestone preferably in a triple screw mixer, and then advanced along the pyrolysis path in which the refuse mixture is subjected to heat from combustion gases from an incineration chamber therebelow. A portion of the pyrolyzed product is recycled to the upstream side of that path and the remainder of the pyrolyzed product is scrubbed with an aqueous medium, e.g. water and/or aqueous acetic acid and the washed pyrolyzed product is then incinerated to produce the combustion gas.
Abstract:
A process for feeding solid industrial and special waste to combustion installations. The waste materials are separated from the combustion chamber by a lock system, are comminuted and homogenized in an inert-gas atmosphere.
Abstract:
In an improved system for recovering heat from a combustion gas produced by burning wastes, the combustion gas or combustible gas produced by partial burning of the wastes subjected to dust filtration in a temperature range of 450-650.degree. C. at a filtration velocity of 1-5 cm/sec under a pressure of from -5 kPa (gage) to 5 MPa before heat recovery is effected. The dust filtration is preferably performed using a filter medium which may or may not support a denitration catalyst. Heat recovery is preferably effected using a steam superheater. The dust-free gas may partly or wholly be reburnt with or without an auxiliary fuel to a sufficiently high temperature to permit heat recovery. The combustion furnace may be a gasifying furnace which, in turn, may be combined with a melting furnace. If desired, the reburning to a higher temperature may be performed under pressure and the obtained hot combustion gas is supplied to a gas turbine to generate electricity, followed by introduction of the exhaust gas from the gas turbine into a steam superheater for further heat recovery. The system can raise the temperature of superheated steam to a sufficient level to enhance the efficiency of power generation without possibility of corrosion of heat transfer pipes by the combustion gas or combustible gas.
Abstract:
Oil shale having a relatively wide range of heating value is combusted by supplying the oil shale and a further fuel having a heating value greater than the heating value of the oil shale to a combustor. The oil shale is fed to the combustor at a substantially fixed rate, independently of the heating value of the oil shale, and the further fuel is fed to the combustor at a rate such that the heating value of the fuel in the combustor remains substantially constant in the face of variations in the heating value of the oil shale. Preferably, the temperature of combustion of the products of combustion is the parameter used to control the rate at which the further fuel is fed to the combustor.
Abstract:
A method and apparatus for heat treating waste materials including pyrolysing the waste materials in a first heating zone to produce pyrolysis gas containing dust and impurities, removing at least 90% of the dust from the pyrolysis gas, and burning the pyrolysis gas to produce flue gas. The flue gas produced is either immediately denitrogenated non-catalytically or first cooled and then catalytically denitrogenated. Following denitrogenation the flue gas is filtered to purify the gas.
Abstract:
Secondary sludge produced in the papermaking process is dewatered by adding a material capable of absorbing water together with dry fibers to the secondary sludge, and mixing the secondary sludge with the dried fibers to produce a modified secondary sludge which has sufficient structure and low enough moisture that it may be further dewatered by mechanical means. The preferred fiber adding materials are those readily produced in the papermaking process, particularly dry primary sludge, dried fines and bark and fly ash from boilers.
Abstract:
A method of treatment of waste material includes the steps of mixing the waste material with binder and pelletizing the mixture. The pellets are then coated with a non-agglomerating material selected to permit firing of the mixture without pellet agglomeration at a temperature above 1300.degree. C. The coated pellets are fed to a kiln and fired at a temperature above 1300.degree. C. before being discharged from the kiln. At least some of the heat of firing the pellets is recovered and recycled to the kiln.
Abstract:
본 발명은 분진의 재순환 처리 장치 및 방법에 관한 것으로서, 유해폐기물 특히 방사성폐기물의 소각·용융처리설비에서 발생하는 분진을 슬러리 형태로 제조하고 기존 용융로 내로 재순환하여 처리하는 유해폐기물의 소각·용융처리설비에서 발생한 분진의 재순환 처리 장치 및 방법에 관한 것이다. 유해폐기물, 방사성폐기물, 분진, 슬러리, 재순환, 용융, 유리고화