• 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:
    Method and system for scrubbing exhaust gas stream from a wet process cement plant wherein a supply of alkaline water and a supply of compressed air are delivered to spray nozzles which are located within the existing exhaust stream ducting. The alkali water is sprayed as a finely divided mist into the duct where it rapidly reacts with the oxides of sulfur and nitrogen present in the exhaust gas. The water, being in the form of very small droplets, and having small volume and large surface area to water volume ratio, rapidly evaporates. The water, therefore, does not cause a problem of wetting and clogging of the ducting and the oxides of sulfur and nitrogen are converted to dry solid particulates which are removed by normal dust collection systems downstream of the scrubber.
    公开号:SU1757444A3
    申请号:SU874203093
    申请日:1987-07-24
    公开日:1992-08-23
    发明作者:Л.Моррисон Гарретт
    申请人:Пассамакводди Трайб Д.Б.А. Дрэгон Продактс Компани (Фирма)；
    IPC主号:
    专利说明:

    The invention relates to the purification of waste gas from waste streams of cement kilns operating in a wet process.
    In cement plants with a wet process and burning coal, oil or other fuels, waste gases contain S02. NOx, dust particles and water vapor. The water vapor concentration is 25-30% of the total mass of the exhaust gas stream.
    The purpose of the invention is to reduce the cost of the process.
    The drawing shows schematically a part of the technological equipment for cement production by the wet method during coal combustion and a plant for the purification of flue gases.
    In tank 1, an alkaline solution is obtained, having a pH of 12.0-12.3, which is obtained by leaching the alkaline material from dust-like waste from the cement production process.
    The alkaline solution is pumped into the storage tank 2. The storage tank 2 may also receive the solution from the non-alkaline reserve source 3 for temporary use or use in the event of an accident. The solution is pumped from tank 2 via one of two high pressure pumps 4 and 5, each of which is reserved to the other, through filter b or 7 to spray nozzles 8. Valves 9 regulate the relative ratio of flow to nozzles 8 or reverse circulation into tank 2. Valves 10 shut off one of the systems of pumps 4, 5 and filters 6 and 7 so that at the same time there is only one way for the IO
    M
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    , and the reserve system was envisaged.
    The air compressor 1 supplies the compressed air to the nozzles with 8 liters of spraying liquor. There is also a .- a source of compressed air 12 pspas.andogo on line 13, which allows for maintenance of the compressor 11, do not stop the gas cleaning process. A source of compressed air about this case should provide 2.84 m / min of air at doy- | chi 5985 n / m, the required pressure of the air; i is an enumeration value and depends on the type of nozzles 8 used, the desired droplet size and the number of nozzles used B. If used in others, the required air pressure and / or volume may be higher or lower.
    The alkaline solution is sprayed at the exit of the kiln: And for cement firing and at the inlet from the dust collector connected to the kiln 15 (g. Gdsdzor is fed through the water line 6 of exhaling pressure.
    Example. In the case of the wet method, it is produced: the initial material is introduced into the oven of the oCxura D type of an aqueous slurry, approximately 30% by weight. Direct burning of the flame is in contact with the material along the entire length of the kiln, which slopes from one end to the other. Liquid cement dough slowly moves to the downward end of the kiln, where the fuel is burned, heat and exhaust gases are directed to the rising end of the kiln. The operation of the furnace leads to the evaporation of water from the slip. The water vapor is transferred to the exhaust gas, along with the odes formed during the combustion of the fuel. The waste gases have a high dew point, so their smallest cooling is a challenge. There is condensation of vapors in an air duct or in a device for collecting particles, which interferes with the normal operation of the furnace,
    In the proposed method in the flow of waste. leaving the kiln, an aqueous solution with a high pH value (12.0–12.3) is introduced in the form of a top dispersed mist with droplet sizes of 35-100 microns, easily evaporated at the temperature of the exhaust gas.
    The alkaline solution is obtained by leaching cement dust, which is a waste of cement production. Typical cement dust contains, wt%: CaO 43.76; SiO2 14.09; AOR 5.36; MDO 2.84; K20 2.81; ABOz 2.48; Re203 1.47; NazOO.SO, loss on ignition - the rest.
    The solution after leaching this valuable dust contains the following substances, wt%: KOH 91.31 NaOH 8.33, Ca (OH) 2 0.16; CaSO / i 2H20 0.20; N20 - the rest.
    In waste gases, the reactions between bo- ple, air, and oxides of sulfur and nitrogen give
    acids, including sulfurous, sulfuric, nitrogenous and nitric. The use of an alkaline solution leads to the neutralization of acids with the formation of salts and water. The amount of the supplied solution corresponds to
    0 the stoichiometric ratio of alkalis and acids formed in the exhaust gases. The sprayed mist is introduced into the waste gases at the exit of the cement kiln and at the inlet to the dust collector connected to the kiln. The resulting solid neutralization products are collected in a dust collector and removed from the process.
    With a variable S02 content in the waste gases from 13.6 to 453.6 kg / h and an average of 93.4 kg / h, the residual content is on average 38.6 kg / h. The average degree of purification from SO2 is 58.74%. The degree of gas purification from KYuh is 50%.
    5The cost of the method is achieved in
    the expense of replacing the alkali with cement dust, which is the waste of the main production, and also due to the fact that a special unit is not required in the cleaning technological equipment where the alkaline solution is injected.
    权利要求:
    Claims (1)
    [1]
    DETAILED DESCRIPTION OF THE INVENTION A method for purifying humidified hot gas effluent streams from sulfur oxides, nitrogen and dust, including leaching an alkaline material, spraying the resulting alkaline solution to form a mist and introducing it into the waste gases, neutralizing acids formed by contact of sulfur oxides and of nitrogen with a mist spray mist, collecting solid neutralization products in the form of dry salts with dust and collecting waste gases from a dust collector with a temperature above the dew point, about t5 l and h and u and in that, to reduce the cost of the process, the purification of exhaust gases in cement production is subjected to wet leaching residues pulverulent cement production
    Based on potassium, sodium and calcium oxides, a solution with a pH of 12.0-12.3 is fed to the spray in an amount corresponding to the stoichiometric ratio of alkalis and acids formed in the exhaust gases,
    5, the sprayed mist is introduced into the waste gases at the exit of the cement kiln in its wet production and at the inlet to the dust collector connected to the kiln.
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    Licata et al.2001|New FGD Developments In Europe
    MX2008003648A|2008-09-02|Method of removing sulfur trioxide from a flue gas stream
    同族专利:
    公开号 | 公开日
    YU140187A|1989-08-31|
    PL267000A1|1989-01-05|
    NO873110L|1988-01-26|
    CH676088A5|1990-12-14|
    CN1009248B|1990-08-22|
    FR2601884A1|1988-01-29|
    DK386687A|1988-01-26|
    GB2193201A|1988-02-03|
    AU607923B2|1991-03-21|
    BE1001656A3|1990-01-23|
    CN87105779A|1988-03-09|
    ES2004453A6|1989-01-01|
    KR880001994A|1988-04-28|
    FR2601884B1|1990-08-24|
    IT1227195B|1991-03-25|
    TR23706A|1990-06-29|
    KR920007875B1|1992-09-18|
    GB8716019D0|1987-08-12|
    ZA875386B|1988-04-27|
    DE3724446A1|1988-02-04|
    ATA184487A|1992-01-15|
    YU46322B|1993-05-28|
    NO170317C|1992-10-07|
    CA1240122A|1988-08-09|
    US4708855A|1987-11-24|
    SG51092G|1992-07-24|
    NO873110D0|1987-07-24|
    AT394954B|1992-08-10|
    DK386687D0|1987-07-24|
    IT8767649D0|1987-07-24|
    BR8703848A|1988-03-29|
    NO170317B|1992-06-29|
    JPS6393328A|1988-04-23|
    GB2193201B|1990-05-30|
    AU7597487A|1988-01-28|
    引用文献:
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    CN103575846B|2013-11-05|2015-05-13|江南大学|Method for quantitatively identifying turbid matters in malt juice|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    US06/890,991|US4708855A|1985-11-07|1986-07-25|Method and system for exhaust gas stream scrubbing|
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