• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The main characteristic lies in the fact that the fumes leaving the calcining furnace (22) are used to heat a current of air which is then used, in its turn, to heat the sand to be treated at its inlet to the calcining furnace, and in that the current of air cooled by the sand to be treated is then heated by means of the purified sand leaving the calcining furnace and is then used as combustion air in the calcining furnace.
    公开号:SU1314951A3
    申请号:SU833535010
    申请日:1983-01-03
    公开日:1987-05-30
    发明作者:Селли Марино
    申请人:Фата Индустриалес П.А. (Фирма)；
    IPC主号:
    专利说明:

    Stages 19, 20 are interconnected by a double acting damper 26 for controlling the amount of sand in each stage. Air from chamber 22 is fed to furnace 2, into which, through channel 1, channels 4, 5, 6 are also fed fuel dp of burning sand in a fluidized bed 3 formed when sand comes in from the preheating chamber c. fluid bed 13. Furnace 2 also contains one or more shelves to form fluidized bed of the
    The invention relates to foundry, more specifically to a plant for recovering sand from foundry cores and molds.
    The aim of the invention is to save fuel and reduce harmful components in the sand.
    The drawing shows the installation diagram.
    The installation of 1 dp of sand regeneration from casting cores and molds contains a fluidized bed kiln 2. At the bottom of the furnace 2 is a layer 3 consisting of sand being processed, which is fluidized by air and gaseous fuels (e.g. methane) fed to the layer through a piping system 4-6. Inlet 7 is designed for combustion air that provides fuel combustion and fluidization of the bed.
    The furnace 2 has an outlet 8, through which the flue gases formed during the combustion of the agglomerated resins contained in the material being processed enter the channel 9 leading to the flue (not shown). A duct 9 is connected to a heat exchanger 10, in which flue gas heat is used to heat the air flowing through duct 11 from fan 12. Air heated in heat exchanger 10 flows into a duct ending at the top of the kiln. In this part of the furnace is located an additional boiling bed 13, sand comes in, under 14951
    battered sand. The gases enter the heat exchanger 10 and then to the emission. The specific feature of the installation is that the burning furnace 2 with a fluidized bed 3, the heat exchanger 18 dp of heating the air supplied to the burning furnace, and the heat exchanger for preheating the sand with the boiling layer 13 are connected to the heat recovery system with the exception of the contact of the sand with flue gas. 1 hp f-ly. 1 il.
    o
    five
    lying processing, which enters the furnace through the inlet chute 14. The heated air that passes through the channel enters the layer 13, fluidizes it, and then leaves the kiln through the channel 15. Channel 16 serves to transfer sand from layer 13 to layer 3 Kiln The furnace 2 has an output of 17 dp of purified sand through which the sand enters the heat exchange apparatus 18, containing two stages 19 and 20, which are fluidized by air coming from channel 15. Channel 15 is connected to channel 21 connected to the chamber 22, in which a heat exchanger 18 is located, the connection being made through a cyclone dust removal device 23, as well as through an electrically driven fan 24, which circulates air. Chamber 22 is also connected to nozzle 7, through which combustion air enters the furnace 2.
    In the partition separating the upper 19 and lower 20 stages, there is a channel 25 through which the cleaned sand passes from the upper stage 19 to the lower stage 20. The channel 25 is controlled by a double action damper 26 having two working positions (one shown in the drawing): the damper overlaps the lower end and exits from the upper end of the channel 25 and 5 borot.
    Chamber 22 is connected to outlet 27 for cleaned sand by chamber 28 to which air is supplied
    0
    five
    0
    the fan 29 through the channel 30. The chamber 28 has an outlet channel 31 connected to the channel 9, in which a spiral pipe 32 with cooling water passes through it.
    The installation works as follows.
    The sand to be processed is fed along chute 14 to layer 13 located in the upper part of kiln 2. This layer is fluidized by air supplied by fan 12 through channel 11 and heated in heat exchanger 10 by gases leaving the kiln. The sand heated in this way leaves layer 13 through channel 16 to the kiln, where agglomerated resins that are in the sand are burned. The flue gases generated during combustion exit through outlet 8 and are directed to the dust separator, after which they release a large portion of their heat to the air passing through heat exchanger 10.
    With the device, the sand to be processed is preheated by the latent heat of the flue gases leaving the kiln, and these flue gases are not enriched with harmful substances from agglomerated resins, as is the case when the sand is heated directly by the flue gases.
    Purified sand exits the kiln through outlet 17,
    passes to the upper stage 19 kip - 35 exchanger for preliminary
    layer and from there through the channel 25, regulated by the valve 26, enters the lower stage 20.
    At the same time, the air that is used to preheat the sand entering the bed 13, located in the upper part of the kiln, passes through the duct 15 into the dust separator 23, and from there, with the help of the fan 24, is fed into the chamber 22, the fluidized bed is heated of the exchange apparatus 18. The air entering through the channel 21 heats the heating 45 and the heat exchanger for preheating sand is connected to the heat recovery system with the exception of contact with smoke gases, while the heat exchanger
    sand coming out of the kiln, and then used as a 50 to preheat the sand of the air going to burn in the kiln contains one or more shelves, a rotary kiln, and it passes through laid one after the other to form the entrance pipe 7, associated with the fluidized bed killing of the processed sand 22, means for passing the pre-heating of the spirit-55 treatment from the heat exchanger to heat the Bay sand, carried out in the air layer by the flue gases and means 13, as well as preliminary heating for transporting the combustion-treated air that is heated in the kiln, and
    five
    carried out in layer 18 provides savings of gaseous fuel fed to the kiln.
    The valve 26 installed in the channel 25 prevents the passage of most of the air entering through the channel 21 into the chamber 22, and, being installed in the partition to the upper stage, prevents the passage of the layer 18 through the channel 25.
    The shutter 26 moves at set and time intervals using an actuator (not shown).
    The purified sand, cooled by air, which is then used for burning in a kiln, is further cooled with water flowing through the coil 32, as well as with a stream of cold air supplied by the fan 29.
    权利要求:
    Claims (2)
    [1]
    1. An apparatus for recovering sand from casting cores and molds, comprising a heat exchanger for heating the air stream with flue gases leaving the kiln, a burning furnace with a fluidized bed, means for feeding gas and air into the furnace chamber, a heat exchanger for heating purified sand of air supplied to the kiln and heat-transfer of sand in a fluidized bed before putting it into the kiln located in the upper part of the kiln, characterized in
    that, in order to save fuel and reduce harmful components in the sand, a fluidized bed kiln is a heat exchanger for heating the air supplied to the kiln,
    and a heat exchanger for preheating sand are connected to a heat recovery system with the exception of contact with sand gases, while the heat exchanger
    for preheating sand it contains one or more shelves arranged one behind the other to form a fluidized bed of sand being processed, means for passing air through
    heat exchanger for heating
    [2]
    2. Installation according to claim 1, about tl and h of air supplied to the kiln, yu and so that in the heat exchange is in the form of two or more folders, the apparatus for heating air, placed one above another, Diped into the kiln, between the formation of the fluidized bed cleaned 5kami, channels for sand bypass with double-acting dampers are made.
    类似技术:
    公开号 | 公开日 | 专利标题
    SU1314951A3|1987-05-30|Device for sand recovery from casting cores and moulds
    US4267801A|1981-05-19|Circulating fluidized bed boiler
    JPH04227402A|1992-08-17|Fluidized bed combustion method and apparatus including integral recirculation heat exchanger equipped with lateral outlet chamber
    EP0005964A1|1979-12-12|Boiler and combustion means therefor
    SU506305A3|1976-03-05|Method of firing materials
    JPH04278104A|1992-10-02|Fluidized bed combustion apparatus including recirculation heat exchanger equipped with non-mechanical solid controller, and method thereof
    US4332551A|1982-06-01|Process and equipment for firing pellets
    US4381916A|1983-05-03|Method and apparatus for roasting fine grained ores
    DK162112B|1991-09-16|PRESSED, CARBON HEATED STEAM GENERATOR
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    PL91398B1|1977-02-28|
    USRE29622E|1978-05-02|Apparatus and process for pellet preheating and volatile recycling in a glass making furnace
    EP0268606B1|1992-01-22|Method and device for pre-heating waste metal for furnaces
    JPH02286421A|1990-11-26|Fuel preheating device for heater
    RU2006108428A|2007-09-27|METHOD FOR TWO-STAGE COMBUSTION OF FUEL AND FUEL FOR ITS IMPLEMENTATION
    CN109982775A|2019-07-05|For heat-treating methods in fluidized-bed reactor and equipment
    JPS63180340A|1988-07-25|Method for regenerating molding sand
    SU494872A3|1975-12-05|The method of oxidizing roasting pellets
    US5191844A|1993-03-09|Process and apparatus for the treatment of dust or like material which is capable of trickle flow
    US4335663A|1982-06-22|Thermal processing system
    EP0035783B1|1984-09-05|Method and means of generating electricity and heat from fuel
    US4436286A|1984-03-13|Process of afterburning combustible constituents of exhaust gases from rotary kilns
    US2157553A|1939-05-09|Regenerating structure and method
    JPS63143409A|1988-06-15|Fluidized bed boiler of circulation type
    SU980636A3|1982-12-07|Fluidized bed furnace for roasting sulfurous materials
    同族专利:
    公开号 | 公开日
    ES518729A0|1983-12-01|
    EP0089927A1|1983-09-28|
    JPS58163545A|1983-09-28|
    DE3365498D1|1986-10-02|
    IT1155658B|1987-01-28|
    AT21638T|1986-09-15|
    US4478572A|1984-10-23|
    EP0089927B1|1986-08-27|
    IT8267368D0|1982-03-23|
    DE89927T1|1984-02-02|
    ES8400686A1|1983-12-01|
    引用文献:
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    CN104475675B|2014-11-07|2017-02-01|江苏科技大学|Batch-type high-temperature used sand atomizing cooling and heat recovery device, and cooling method|
    CN107091573B|2016-02-17|2019-01-11|沈阳博宇科技有限责任公司|A kind of pot type burner furnace roof hopper automatic feeding system|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    IT67368/82A|IT1155658B|1982-03-23|1982-03-23|SYSTEM AND METHOD FOR THE RECOVERY OF SANDS CONTAINED IN FOUNDRY SHAPES AND SOULS BY CALCINATION IN A FLUIDIZED BED OVEN|
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