| section Home
Production, Amateur Radio amateur Model aircraft, rocket- Useful, entertaining |
Stealth master
Electronics Physics Technologies invention |
space Mystery
Earth Mysteries Secrets of the Ocean Stealth section Map |
  |
| Use of material is permitted for reference (for websites - hyperlinks) | |||
Navigation: => |
Home / Products Patents / In the section of the catalog / back / |
|
INVENTION
Russian Federation Patent RU2287111
METHOD FOR PROCESSING MUNICIPAL SOLID WASTE IN BOF
Name of the inventor: Mokrinskiy Andrey Viktorovich (RU); Lavrik Aleksandr Nikitivich (RU); Eugene V. Protopopov (RU); Volynkina Ekaterina Petrovna (RU); Sokolov Valeriy (RU); Dolgopolov Vladimir Pavlovich (RU); Buymov Afanasievich Vladimir (RU); Goldfinches Mikhail (RU); Yermolaev Anatoly Ivanovich (RU); Makarchuk Vladimir (RU); Ganzer Lydia Albertovna (RU); Goldfinches Sergey (RU)
The name of the patentee: Open Joint Stock Company "West Siberian Iron & Steel Works" (RU); State Educational Institution of Higher Professional Education "Siberian State Industrial University" (RU)
Address for correspondence: 654043, Kemerovo region, Novokuznetsk, w.. Space, 16, JSC "West-Siberian Steel Works", Patent and License Department, OF Volodya
Starting date of the patent: 2005.02.02
The invention relates to processes for the thermal processing of municipal solid waste (MSW) and can be used in ferrous metallurgy. Method for processing of municipal solid waste in the BOF include burning of solid waste and carbon-containing materials in the liquid slag bath, flushed with oxygen-containing gas. At the bottom of the BOF charged with a mixture of combustible non-toxic components of solid waste in the form of agglomerates with a calorific value 4-15 MJ / kg in the amount of 0.5-20 kg / t of liquid steel, flooded with scrap carbonaceous materials have a seat and heated with oxygen at a rate of more than nominally 0,59-0,73 m 3 / kg of solid waste loaded, then pour the liquid iron and lead oxidation purge. As a non-toxic combustible components of MSW using food waste, textiles, rubber, leather, wood waste, bones. Using the process of the invention provides a combination of oxidative refining of metal and thermal processing of solid waste in the converter.
DESCRIPTION OF THE INVENTION
The invention relates to processes for the thermal processing of municipal solid waste (MSW) and can be used in the steel industry, particularly in the production of BOF.
There is a method for thermal processing of solid waste in boilers, furnaces grate / Grechko AV Thermal methods of recycling of solid waste: energy and environmental // Electrometallurgy 2000, №8, s.33-39 /.
The known method allows to burn solid waste and thus solve the problem of their disposal.
The disadvantage of this method is a low temperature process (600-900 ° C), in which, moreover, are formed secondary solid waste (25-30%), contaminated by these toxic substances generated most intensively highly toxic compounds such as dioxins, furans, et al., Which require disposal.
There is a method for thermal processing of solid waste in aggregates with liquid slag bath / US №4294433, F 27 B 001/20, 1981 /.
The known method allows to process (to recycle) of solid waste in high-temperature furnaces (1200-1400 ° C and above), widely used in non-ferrous metallurgy and furnaces called Vanyukov (PX), characterized by the absence of secondary solid waste.
The disadvantage of this method is the high energy consumption, emissions to the atmosphere and low technological processes associated with specific factors of a regional nature: the construction or reconstruction of the units with the liquid slag bath to work on the new technology, the availability of other wastes and their value to the co-processing of solid waste, the need and the volume processing-use products, etc.
The closest the technical essence and achieved result is a proposed method for thermal processing of solid waste, including loading the waste and carbonaceous fuels to the molten slag bath, purged with oxygen-containing gas / SU №1315738, 4 F 23 G 5/00, 1987 /.
The known method allows for rapid heating and combustion of MSW directly into the molten slag volume, delete selection at low temperature gases containing organic compounds, including these particularly dangerous as dioxins.
The disadvantage of this method is the high capital investment in the design and construction of MSW incinerators bubbling in the melted slag, the complexity of industrial operation, the additional costs of the flue gas cleaning dust and harmful gaseous inorganic compounds, continuously removing slag from the furnace is formed.
The object of the invention is to reduce the capital cost by combining oxidizing metal refining process and thermal processing of solid waste in the existing metallurgical units.
The problem is solved as follows.
In the method of processing municipal solid waste, comprising loading of the waste, carbonaceous materials and oxygen purge, the invention after loading at the bottom of the converter solid wastes in the form of a mixture of combustible agglomerates nontoxic solid waste components with a combustion heat of 4-15 MJ / kg in an amount of 0.5- 20 kg / t-molten steel, and heat the scrap bombarded with oxygen at a rate in the range of 110-200% of the nominal, then pour the liquid iron and lead oxidative refining.
As a non-toxic combustible components of MSW using food waste, textiles, rubber, leather, wood waste, bones.
This sequence of the method for thermal processing of municipal solid waste in the BOF process can significantly increase the temperature in the first few minutes of blowing and pointing to accelerate primary ferrous slag, which ensures complete combustion of the combustible components of MSW non-toxic in the volume of molten slag and does not hinder the oxidative refining of metal.
MSW is subjected to pre-sorting to separate valuable, non-flammable, toxic components and / or components that emit in the process of decomposition and combustion of toxic compounds. The residual portion of MSW after sorting okuskovyvayut in order to increase the density and reduce the possibility of the removal of the lungs and small components from the steelmaking unit. Dimensions pieces (briquettes packets, granules, etc.), They must ensure a convenient stacking feeders, unhindered introduction into an oxygen converter and complete combustion in the volume of the melted slag.
Warming oxygen charge materials after you download them to the bottom of the converter allows you to improve the process of slag formation, accelerate the mass transfer processes between the metal and slag, metal provides deep refining of contaminants, reduces the loss of metal from slag peroxidation.
Entering MSW in warming up of the charge materials increases the exothermic effect of combustion of carbon-containing materials due to the presence in the composition of MSW and legkozazhigaemyh bystrosgoraemyh components (paper, textiles, etc..) And helps to reduce oxygen flow due to the presence of their own oxygen-containing gas in the organic waste mass.
Rapid heating and burning MSW directly into the high volume molten slag completely eliminates the formation of highly toxic gaseous compounds such as dioxins, furans, etc., does not require additional costs for cleaning the flue gases from the dust and harmful gaseous inorganic compounds, and a special unit of deletion resultant slag.
The heat of combustion of the combustible mixture of non-toxic components of MSW is defined by its components: food waste, textiles, rubber, leather, wood waste, bones. The use of solid waste with a calorific value of less than 4 MJ / kg resulted in a "cold" the beginning of melting, a bad lime dissolution, reduction reaction slag capacity at the beginning of blowing, slowing mass transfer processes between the metal and the slag is not possible to combine the process of oxidative refining and thermal processing of solid waste in an oxygen converter.
Using a mixture of solid waste with a calorific value of combustible components nontoxic than 15 MJ / kg of waste requires more sorting and removal of solid waste mixtures of low-calorie components (such as food wastes) and increases the cost of solid waste thermal processing in an oxygen converter.
When the number of non-toxic mixture of combustible components of MSW at least 0.5 kg / ton of liquid steel exothermic effect reduces the combustion of carbonaceous materials, which leads to a "cold" fusion top slows slagging in the first minutes and blowing complicates oxidative metal refining, it is not possible to combine with the heat MSW processing in the basic oxygen furnace.
When the amount of the mixture of combustible non-toxic components of MSW to 20 kg / t of liquid steel increases the amount of generated slag and flue gases released by burning of solid waste that pollutes the metal secondary solid components, requires additional costs for flue gas cleaning from dust and inorganic compounds, and does not allow to combine thermal processing of solid waste from the oxidative refining of metal in the BOF.
When the flow of oxygen to the heating of the raw materials of less than 110% of the nominal applied to the metal heating decreases exotherm combustion of carbonaceous materials and legkozazhigaemyh and bystrosgoraemyh MSW components (paper, textiles, etc.), Does not provide the necessary heating the raw materials, which leads to a "cold "the beginning of the process, slows the slag formation in the beginning of the purge, complicates the oxidative refining of metal and does not allow it to combine with the thermal processing of solid waste in the BOF.
By increasing the oxygen flow to the heating of the raw materials more than 200% of the nominal applied to the heating metal reduced its degree of digestion, increases the cost of oxidative refining of metal and thermal processing of solid waste in the BOF.
New technical result of the invention is to achieve optimum conditions for rapid targeting of primary ferrous slag immediately after casting iron at the beginning of purging and burning of combustible non-toxic components of MSW in the amount of high-temperature molten slag without the formation of gaseous highly toxic compounds and secondary particulate components, contaminating the metal that allows to combine process metal refining oxidative and thermal processing MSW in a BOF.
The method is implemented at the West Siberian Metallurgical Combine in the oxygen-converter shop №2.
Example: In a 350-ton converter with top-blown oxygen were charged agglomerates 2 t MSW (6.25 kg / t-molten steel). Pre-sorting of solid waste and recover valuable (ferrous and non-ferrous metals, glass, plastic, paper and paperboard), incombustible (stones) and toxic (mercury lamps, galvanic cells) components. The remaining part of solid waste is a mixture of non-toxic combustible components of MSW with a calorific value of 11.6 MJ / kg of the following composition (wt.%): Food waste - 74; unsuitable for re-use of waste paper - 8; textiles - 12; Leather - 1.7; wood waste - 1.7; Rubber - 1.3; bone - 1.3, which is compressed into packets of 800 × 500 × 500 mm 3 rows and tied metal wire. After loading at the bottom of the converter SDW flooded with scrap metal, sits carbonaceous material (coal gas), lime and lime-magnesia flux. Further lowered oxygen lance and oxygen produce heating for 7.5 minutes at a flow rate of 200 m 3 / min, which is 140% of the nominal applied to the heating scrap. After warming up to the converter poured iron. Low iron poured 1400 ° C, chemical composition,%: Si 0,48; Mn 0,40; S 0,018; P 0.15. Further oxidation refining lead, sitting during purging slag materials (lime and manganese agglomerate) moving the lance in a vertical direction with the change in oxygen flow. The duration of the purge 18 minutes. povalke metal temperature 1650 ° C, contains metal,%: C 0.10; Mn 0,16; P 0.015; S 0,013. Slag basicity of 3.0; the content of FeO 18,5%; yield of 92.0%.
Application of the method of thermal processing of municipal solid waste in the converter can reduce capital costs by combining oxidizing metal refining process and thermal processing of solid waste in the existing metallurgical units.
CLAIM
1. A method for thermal processing of municipal solid waste, comprising loading of the waste, carbonaceous materials and oxygen purge, characterized in that the loading of municipal solid waste as a mixture of combustible agglomerates nontoxic components 4-15 calorific value MJ / kg in an amount of 0.5-20 kg / t of liquid steel with carbon-containing materials is carried out on the converter bottom, flooded with scrap metal and purged of oxygen with a flow rate in the redistribution of 110-200% of the nominal, then pour the liquid iron and lead oxidative refining.
2. A method according to claim 1, characterized in that as non-toxic solid combustible waste components, used food waste, textiles, rubber, leather, wood waste, bones.
print version
Publication date 12.12.2006gg
Comments
Commenting, keep in mind that the content and the tone of your messages can hurt the feelings of real people, show respect and tolerance to his interlocutors, even if you do not share their opinion, your behavior in terms of freedom of speech and anonymity offered by the Internet, is changing not only virtual, but real world. All comments are hidden from the index, spam control.