65 results about "Incinerator bottom ash" patented technology

The invention relates to an application method of a double-layer continuous casting tundish covering agent, which belongs to the technical field of the continuous casting. The invention relates to a comprehensive using method of two covering agents when the low carbon and ultra-low carbon steel grades which have high requirements on the steel cleanliness are casted, bottom slag begins to be added after a large ladle is casted and is sufficiently added after the liquid lever of molten steel is positioned, and five minutes later, top slag is added at the temperature measuring and sampling location according to proportions; the percentages by weight between the bottom slag and the top slag are that: the top slag is 75-85 percent and the bottom slag is 15-25 percent. The invention has the advantages that the bottom slag keeps the characteristic that the high-basicity covering agent has strong absorbing and intermingling capability, at the same time, the second oxidation of the molten steel can be prevented and the carbolic content in the molten steel can be reduced; the top slag can cover the molten steel by taking a loose and porous shape, the incrusting phenomenon of the covering agent at the temperature measuring and sampling location can be improved obviously, the normal temperature measuring and sampling can be carried out and the invalidation loss caused by the incrusting of a temperature measuring head and a sampler can be reduced; the operation is simple, the covering agent of the common steel grades can be used as the bottom slag and the shell-broken operation is not carried out any more; the operational condition pollution caused by carbonizing rice huskes can be avoided.

In accordance with an embodiment, a method for producing an aggregate is disclosed comprising mixing incinerator bottom ash (“IBA”) from a municipal solid waste incinerator and pulverized fuel ash (“PFA”) from coal combustion. The method further comprises agglomerating the mixture, such as by pelletizing, and pyroprocessing the agglomerates, such as by sintering or vitrification, to form the aggregate. The addition of PFA to IBA has been found to facilitate production of lightweight and normal weight aggregates. Preferably, the IBA or the mixture of IBA and PFA is wet milled prior to agglomerating. A preferred proportion of IBA to PFA is 40% / 60%. The agglomerates may be coated with an inorganic material to create a surface layer on the aggregate. Organic material may be included in the mixture to increase the porosity of the aggregate. A lightweight sintered aggregate comprising IBA and PFA and an aggregate comprising IBA and PFA are also disclosed.

The invention discloses a circulating fluidized bed boiler bottom slag cooling system, and relates to combustion equipment bottom slag cooling technology. The system mainly comprises a slag cooler and a bottom slag thickness separator. The bottom slag thickness separator comprises a barrel, a bottom slag inlet, an air inlet, an air outlet and a bottom slag outlet. The bottom slag inlet is connected with a slag discharge port at the bottom of the circulating fluidized bed boiler through a boiler slag conveying pipe; the bottom slag outlet is connected with the inlet of the slag cooler; and the air inlet is connected with a secondary air pipe of the circulating fluidized bed boiler. Secondary air from an air pre-heater enters the bottom slag thickness separator through the air inlet to exchange heat with bottom slag before entering the hearth of the boiler and takes away fine granule materials in the bottom slag, finally the fine granule materials are returned to the hearth of the boiler through the air outlet to participate in material circulation, and the coarse granular slag falls to the slag cooler on the lower part for further cooling. The system can realize selective slag discharge, and solves the problems of local coking of the fluidized bed slag cooler and the like so as to further improve the running stability of the boiler.

In accordance with an embodiment, a method for producing an aggregate is disclosed comprising mixing incinerator bottom ash (“IBA”) from a municipal solid waste incinerator and pulverized fuel ash (“PFA”) from coal combustion. The method further comprises agglomerating the mixture, such as by pelletizing, and pyroprocessing the agglomerates, such as by sintering or vitrification, to form the aggregate. The addition of PFA to IBA has been found to facilitate production of lightweight and normal weight aggregates. Preferably, the IBA or the mixture of IBA and PFA is wet milled prior to agglomerating. A preferred proportion of IBA to PFA is 40% / 60%. The agglomerates may be coated with an inorganic material to create a surface layer on the aggregate. Organic material may be included in the mixture to increase the porosity of the aggregate. A lightweight sintered aggregate comprising IBA and PFA and an aggregate comprising IBA and PFA are also disclosed.

The invention discloses a garbage incineration ash slag heavy metal solidifying method, and belongs to the field of solid waste disposal and resource utilization. The method comprises the following steps of obtaining waste sundry metal and fine bottom slag after sorting and crushing of the garbage incineration ash slag; using the waste sundry metal for metal regeneration; performing mixing, fusingand water quenching on the bottom fine slag with the garbage incineration ash slag; using the water quenching slag for cement and crystallized glass, wherein the heavy metal in the product is lower than the limit value of Identification Standards for Hazardous Wastes-Identification for Extraction Toxicity (GB 5085.3-2007). The method provided by the invention has the advantages that the process is simple; the industrialization is easy; the goals of safely solidifying garbage incineration ash slag heavy metal and recycling the garbage incineration ash slag heavy metal for cement and crystallized glass can be achieved.

The invention discloses a method and a system for realizing NOx discharge reduction and stable combustion of a power station boiler, which belongs to the technical scope of coal powder power station environmental protection. In the system, a coal mill is connected to a fluidized bed gasifier and a boiler respectively, and a top syngas outlet of the fluidized bed gasifier is connected to a boiler combustor. The method particularly comprises the following steps: performing fluidized bed gasification of fire coal which is 5-20% of the boiler load, delivering the syngas generated in the fluidized bed to a boiler reburning combustor for reburning so as to reduce NOx discharge, or delivering the syngas to a boiler main fuel combustor so as to allow the syngas to be used as auxiliary fuel and to combust stably when the boiler combusts inferior coal of has a low load; after treatment, delivering the gasified top ash and bottom slag in the fluidized bed to a primary air channel of a boiler coal powder combustor, mixing with coal powder so as to combust the uncombusted components. During the cooling process, the heat of high-temperature bottom slag is taken away by supplying water into the boiler, and the bottom slag is delivered to a heating surface of the boiler for heating. The invention realizes the effect of NOx discharge reduction and stable combustion of a power station boiler.

The invention provides a hazardous waste disposal method which comprises the following steps: carrying out primary incineration disposal on a hazardous waste to obtain bottom dreg and first flue gas;carrying out secondary incineration disposal on the first flue gas to obtain first fly ash and second flue gas; and melting a melted raw material to prepare one or more of microcrystal glass, fiber cotton and a cement admixture, wherein the melted raw material comprises the bottom dreg and the first fly ash. According to the hazardous waste disposal method provided by the invention, the emitted flue gas reaches the standard and the hazardous waste can be recycled.

This invention provides a method for stabilization and treatment of heavy metal bearing materials and wastes subject to acid leaching tests or leach conditions and odor limits by addition of acid semi-soluble DiCalcium Phosphate DiHydrate such that the leaching potential is inhibited to desired levels and odors are reduced to desired levels and the material or waste is free flowing, more permeable, less weight and permits immediate handling and disposal or reuse. The resultant material or waste after stabilization is deemed suitable for on-site reuse, off-site reuse or disposal as RCRA non-hazardous waste.

The invention relates to a two-stage wind-water joint cooling scraper-type cold slag conveyer which comprises a primary slag cooler; an inlet of the primary slag cooler is communicated with an outlet of a circulating fluidized bed boiler slag discharge pipe; a primary slag cooler scraper is arranged at the middle lower part in the primary slag cooler; the cold slag conveyer also comprises a secondary slag cooler; the inlet of the secondary slag cooler is communicated with the outlet of the primary slag cooler; a secondary slag cooler scraper is arranged at the middle lower part in the secondary slag cooler, a cooling water heating surface is arranged below the secondary slag cooler, and a secondary slag cooler discharge pipe is arranged below the rear part of the secondary slag cooler; bottom flag enters a wind-water joint cooling primary slag cooler; when being cooled, the bottom slag is conveyed by the primary slag cooler scraper; hot air after heat exchange returns to a hearth through an air return pipe; the primarily cooled bottom slag enters the secondary slag cooler; a cooling water jacket further cools the bottom slag and sends the bottom slag to follow-up slag conveying equipment; and the cold slag conveyer has a good slag cooling effect, is not restricted by the grain size of the bottom slag, integrates slag cooling and slag conveying, so that the system is simpler and more reliable.

The invention discloses a waste treatment and recycle system, which is characterized in that solid wastes and liquid wastes are treated through a solid and liquid waste incineration treatment system;harmful collected dust and bottom slags produced by incineration are treated through a high-temperature hot melting treatment system so as to produce melting-regenerated aggregates; harmless collecteddust and bottom slags produced by incineration and the melting-regenerated aggregates are processed through a cement product system so as to produce a high-pressure concrete product or other cement products; and waste heat produced by the waste incineration treatment system can be connected to a cogeneration System so as to produce steam and electric power, so that the enterprise waste treatmentproblem is solved, meanwhile, the steam, the electric power, the melting-regenerated aggregates, and the high-pressure concrete product or other cement products are produced, and the effect on waste resource recovery is further achieved.

A boiler ash and slag removing system comprises a cooling mechanism, a conveying mechanism and a treatment mechanism. The cooling mechanism comprises a slag cooler set. The slag cooler set comprises a first slag cooler and a second slag cooler. The treatment mechanism comprises a dust collector and a slag bin. The cooling mechanism and the treatment mechanism are connected through the conveying mechanism. A chain conveyor is arranged at the bottom end of the slag cooler set. The slag outlet end of the first slag cooler and the slag outlet end of the second slag cooler are located at the upper end of the chain conveyor. Waste heat recycled by the slag coolers can be utilized, and waste is reduced. Through a sewage pump, fine dust in bottom slag conveyed on the chain conveyor can be removed, and the efficiency of the ash and slag removing system is improved. The slag bin can be connected with a wet ash and slag removing device or a dry coal ash removing device, the ash and slag removing efficiency is improved, the ash and slag removing manner is added, and the using efficiency of the system is improved.