摘要:
A process for the conditioning of contaminated waste through cementing. Dry waste is cemented, especially waste which is recovered as ashes subsequent to the combustion of burnable waste, or as a dry residue during the treatment of sludge. In the process there is added to the dry waste a cement component not less than about 50% by weight of the weight of the waste, wherein subsequent to the admixing of the waste with the cement, there is mixed in water to the cement in a slightly excess stoichiometric ratio of effecting the setting, and the mixture is compacted under pressure and then encased.
摘要:
Sluice gate members mounted for swinging movement about a shaft offset from the center of a furnace and arranged to be moved both gradually and discontinuously are interposed between an upper pyrolysis and precombustion chamber and a lower afterburning chamber. The movement of these sluice gate members causes particles of the fire bed supported on them to drop down into the afterburning chamber, largely in the form of embers, at about the same rate as additional waste material is added to the fire bed, so as to maintain a fire bed of approximately constant size. The sluice gate members are hollow and secondary air is blown into them near the shafts on which they are mounted and flows out through holes on their bottom surfaces and in their facing tip edges and then proceeds downward to contribute to the afterburning process.
摘要:
A method and a combustion furnace are provided by means of which waste which is predominantly of organic nature can be burnt effectively and uniformly. The combustion furnace comprises two bottlenecks, one above the other, constituted by rocking grates. The upper rocking grate essentially serves to subject the solids to pre-combustion, namely to drying, degasifying, and partial gasifying, and to supply the material uniformly in doses to the fire bed which is located on the lower grate and in which complete gasification takes place. Rotational movements of both grates provide for uniform passage of the material through the shaft without the risk of burn-through occurring along the edges so that the entire combustion process becomes highly uniform.
摘要:
An incinerator, especially for burning waste material with a device for pfying flue gases derived from a combustion chamber for burning the waste material. In the combustion chamber or adjacent thereto, discharge openings of conduit means are provided for conveying fresh air thereto. The device for purifying the flue gases comprises a filter of high heat-resistant material which is interposed between the combustion chamber and a flue.
摘要:
A plant for burning waste which has a main combustion chamber to be chargedith the waste to be burnt and with fresh gases for burning the waste. From this main combustion chamber the burnt material and unburnt residual material including gases pass through a grate into a post-combustion chamber, the bottom of which is adapted to be closed, and which has lateral outlets for the waste gas. The post-combustion chamber which has a volume at least equalling the volume of the main combustion chamber has a wall structure extending from above into said post-combustion chamber for guiding gases passing through the grate toward the bottom of the post-combustion chamber. This wall structure is open at its lower end and is of highly heat resistant material as e.g. steel. The post-combustion chamber has a waste gas outlet through which the waste gas from the post-combustion chamber is discharged after it has, prior thereto, been purified by passing through filters between an outer wall and inner wall of the post-combustion chamber.
摘要:
Combustible gases produced by pyrolysis of combustible material undergo partial combustion in a combustion chamber to which air is admitted in substoichiometric quantity ratio, at a temperature of about 800.degree. C. A gas duct leading out of the combustion chamber and passing partly or all the way across the combustion chamber with one or more openings for entrance of the combustible gas is supplied with additional air in at least stoichiometric quantity ratio, with the result that complete combustion of the combustible gas takes place within the duct as the gases pass out of the combustion chamber, at a temperature of about 1100.degree. C., producing a flame jet that can be used to heat an adjacent boiler, heat exchanger, or the like.
摘要:
A method of and furnace for burning waste material. The furnace has a cenl chute for receiving the waste material, and a combustion chamber which is arranged below the chute and has a closed bottom. The transition between the central chute and the combustion chamber is designed as a constriction. The waste material is accumulated above the constriction, where it is dried and degasified up to the point of combustion by being heated up under the exclusion of air in the central chute. Heated up fresh air is supplied ahead of the constriction at below stoichiometric ratio to the heated up waste material and to the exhaust gases formed during the heating up of the waste material. The exhaust gases are withdrawn downwardly through the constriction, and further fresh air is supplied to the exhaust gases and to the degasified waste material for their common combustion at the constriction, so that essentially only ashes pass downwardly into the combustion chamber through the constriction. Fresh air supply lines discharge at the constriction and in the lower portion of the chute above the constriction. A portion of the combustible gases resulting during the degasification and the destructive distillation of the waste material are removed at the constriction. The flue gases formed in the combustion chamber are guided to a flue through discharge openings in the exhaust chamber of the combustion chamber. The exhaust chamber is designed in such a way that it surrounds the central chute. A device is provided in this chute for storing the waste material. Conduits, which extend into the chute from outside and are connectable to a suction device, discharge at the constriction.
摘要:
A furnace for waste material. The furnace has a central chute for receivinghe waste material, and a combustion chamber which is arranged below the chute and has a closed bottom. The transition between the central chute and the combustion chamber is designed as a constriction in such a way that the waste material remains above the constriction in the central chute for drying and degasification up to the point of combustion. Essentially, only ashes pass through the constriction downwardly into the combustion chamber. The gases which are withdrawn downwardly out of the chute are also guided through the constriction into the combustion chamber. Fresh air supply lines discharge at the constriction and in the lower portion of the chute above the constriction. The flue gases formed in the combustion chamber are guided to a flue through discharge openings in the exhaust chamber of the combustion chamber. The exhaust chamber is designed in such a way that it surrounds the central chute. A device is provided in the chute for stirring the waste material. A guide arrangement is provided below the transition area between the central chute and the combustion chamber. Starting from this transition area, the guide arrangement is formed as an intermediate wall in such a way that the combustion chamber is divided into an inwardly lying step-down flow portion, and an outwardly lying chamber which at the same time forms the lower portion of the exhaust chamber. Further fresh air supply lines discharge in the region of the lower portion of the exhaust chamber.
摘要:
A gasification shaft in the reactor collects a loose heap of solid waste matter on a support at the bottom of the shaft in the form of a triangular hollow prism having longitudinal edges leaving gaps between it and the walls of the shaft. The support can be swung about its axis to open the gaps wider and shake the solid material. Oxygen containing gas is supplied at the top of the shaft and supports partial combustion of the solid material. Gas and partly burned solid material pass down through the variable gaps into a combination chamber below the shaft into which more oxygen containing gas is fed both from above through the prismatic support and from below through an ash chamber at the bottom of the combustion chamber after passing through lower gaps between an emptying device of triangular prism shape, below which is an ash removal chamber. The additional oxygen supplied from below into the combustion chamber assures the complete combustion of the solid material so that treatment of the ash outside of the reactor becomes unnecessary.
摘要:
Separation of the apparatus for drying and degassing organic waste from the shaft furnace containing a gasification chamber and a combustion chamber increases the through-put capability of the shaft furnace gasification. The gasification is promoted by the addition, in the same direction of flow as the partly carbonized waste material, of a gas such as air, steam, carbon dioxide or oxygen adjusted in accordance with the changes in composition of the material that is gasified. The drying and degassing chamber is a rotary drum feeding the dried and degassed material into the top of the shaft furnace. An intermediate chamber may be imposed between the rotary drum and the shaft furnace at the top of the shaft furnace so that a sieve can separate incombustible material such as metal parts for withdrawal through a gas-tight sluice. A narrow gap, either a straight gap between moveable members or an annular gap defined by a rotary plug, provides the communication between the gasification chamber and the combustion chamber below. Material is held above the gap for completion of gasification and the actual combustion with additional air supply takes place in the combustion chamber.