• 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:

    公开号:AU2009266109A1
    申请号:U2009266109
    申请日:2009-06-13
    公开日:2010-01-07
    发明作者:Nikola Anastasijevic；Edgar Gasafi；Frank Siewert；Dietrich Werner
    申请人:Outotec Oyj；
    IPC主号:C04B33-32
    专利说明:
    WO 2010/000383 PCT/EP2009/004271 Process for Operating a Plant for Producing Calcined Clay 5 This invention relates to a process for operating a plant for producing calcined clay. At present, cement primarily is made of ground cement clinker, which is, however, very energy-intensive and leads to high CO 2 emissions. Beside the CO 2 emission from the combustion for achieving the clinker temperature as high as about 1450*C, CO 2 is 10 separated and emitted from limestone - the main raw material of clinker production. One possibility for reducing CO 2 emissions is the admixture of cement substitutes, such as calcined clay. Conventional plants for cement production by the dry or semidry process consist of a 15 precalciner (for instance series-connected cyclone preheaters) and a succeeding rotary kiln, alternatively a grate preheater (Lepol process) in the semiwet process. Calcining fine-grained mineral solids, such as clay, conventionally is effected in rotary kilns or multiple-hearth furnaces. This ensures the maintenance of a low temperature 20 with a retention time necessary for treatment in this process. U.S. patent 4,948,362 for instance describes a process for calcining clay, in which kaolin clay is treated in a multiple-hearth furnace by means of a hot calcining gas to increase gloss and minimize abrasiveness. In an electrostatic precipitator, the calcined clay powder is separated from the waste gas of the calcining furnace and processed to obtain the desired prod 25 uct. Due to the described demand of calcined clay for cement production, an inexpensive production process herefor is of particular interest. It is the object of the present inven tion to satisfy this demand close to the place of cement production. 30 This object in particular is solved with the invention in that for manufacturing calcined clay, the plant for producing cement by the dry or semiwet process is used itself, with a precalciner, for instance comprising at least one line of series-connected preheating WO 2010/000383 PCT/EP2009/004271 -2 stages, such as cyclone preheaters or grate preheaters, and a rotary kiln or roaster, wherein in accordance with the invention the rotary kiln or roaster for producing heating gas is utilized as combustion chamber, replaced by a combustion chamber and/or completed by an additional combustion chamber. The heating gases are used for 5 calcining clay and are guided through the preheating stages in counterflow to the sol ids. In accordance with the invention, an existing cement plant thus can be converted to operation for calcining clay at low cost by using the existing precalcining stages. The clay preferably is heated by the respective combustion chamber heating waste 10 gases to a temperature of up to 900 0 C, preferably between 650 and 850*C; with a corresponding retention time, these temperatures are sufficient to completely calcine the clay. In accordance with the invention, it may be advantageous when preheating is effected 15 in at least two preheating lines, wherein the one preheating line serves for preheating the clay and the other one for heating clinker raw material. A particularly flexible operation is possible when beside the rotary kiln or roaster for cement production an additional combustion chamber is operated, to which a separate 20 heating line for the clay possibly is associated. In a further aspect of the invention, a fuel/air mixture can be supplied to the heating gas stream of the respective combustion chamber before entry into the preheating line, so that enough heat is available in the possibly two or more preheating lines. 25 For the purpose of a flexible and economic utilization of the process of the invention, the fuel and/or air supply for the respective combustion chamber can be controllable. In the rotary kiln or roaster, relatively poor fuels, such as coal, carbonaceous minerals with sufficiently positive calorific value, biomass, sewage sludge and/or wastes can be 30 used, which further increases the economy of the process. With a suitable mineralogical composition, the combustion residues can be admixed to the mass flow "calcined clay".
    WO 2010/000383 PCT/EP2009/004271 -3 Further objectives, features, advantages and possible applications of the invention can be taken from the following description of embodiments and the drawing. All features described and/or illustrated form the subject-matter of the invention per se or in any 5 combination, also independent of their inclusion in individual claims or their back reference. The only Figure illustrates an example for performing the process of the invention. 10 The illustration in the only Figure represents the fundamental principle of the operation of a plant for producing cement. The same includes a precalciner 1 with a plurality of preheating stages 2, which for instance can be formed as cyclone preheaters. Further more, it includes a rotary kiln 3, which in accordance with the invention can, however, (also) be operated as combustion chamber 3' by supplying fuel and air. To the heating 15 gas obtained in the combustion chamber 3', a fuel/air mixture can be supplied before entry into the precalciner 1. As a result, heating of the clay to be calcined, which is added as solid in counterflow to the heating gases, can be effected up to 900*C, pref erably to 650 to 8500C. 20 Variants of the process shown in the drawing in particular consist in that either to the one rotary kiln 3 with one preheating line a combustion chamber 3' additionally is asso ciated or that to the one rotary kiln 3 operated as combustion chamber 3' at least two preheating lines from preheating stages 2 are associated, wherein for instance in the one preheating line clinker raw materials are preheated and in the other preheating line 25 the clay to be calcined is preheated. To make this process more flexible, combinations of these variants can also be used.
    WO 2010/000383 PCT/EP2009/004271 -4 List of Reference Numerals 1 precalciner 2 preheating stages 5 3 rotary kiln or roaster 3' combustion chamber
    权利要求:
    Claims (9)
    [1] 1. A process for operating a plant for producing calcined clay by using a plant known per se for producing cement by the dry or semiwet process, with a precalciner 5 (1), for instance comprising at least one preheating line of series-connected preheating stages (2), such as cyclone preheaters or grate preheaters, and a rotary kiln or roaster (3), wherein the rotary kiln or roaster (3) for producing heating gas is utilized as com bustion chamber (3'), replaced by a combustion chamber (3') and/or completed by an additional combustion chamber (3'). 10
    [2] 2. The process according to claim 1, characterized in that the clay to be calcined is guided through the precalciner (1) in counterflow to the heating gases of the respec tive combustion chamber (3') and is heated by the heating gases to a temperature of up to 9000C, preferably between 650 and 850 0 C. 15
    [3] 3. The process according to claim 1 or 2, characterized in that preheating is effected in at least two preheating lines, wherein the one preheating line serves for preheating the clay and the other one serves for heating clinker raw material. 20
    [4] 4. The process according to any of the preceding claims, characterized in that beside the rotary kiln or roaster (3) for cement production an additional combustion chamber (3') is operated, to which possibly a separate preheating line for the clay is associated. 25
    [5] 5. The process according to any of the preceding claims, characterized in that a fuel/air mixture is supplied to the heating gas stream of the respective combustion chamber (3') before entry into the respective preheating line.
    [6] 6. The process according to any of the preceding claims, characterized in that the 30 fuel and/or air supply for the respective combustion chamber (3') is controllable. WO 2010/000383 PCT/EP2009/004271 -6
    [7] 7. The process according to any of the preceding claims, characterized in that in the respective combustion chamber (3') coal, carbonaceous minerals with sufficiently positive calorific value, biomass, sewage sludge and/or wastes are burnt. 5
    [8] 8. The process according to any of the preceding claims, characterized in that the combustion residues obtained in the respective combustion chamber/rotary kiln are added to the mass flow "calcined clay".
    [9] 9. A plant for performing a process according to any of the preceding claims, 10 comprising a precalciner (1) and a rotary kiln and/or roaster (3) operable as combustion chamber (3') and/or a combustion chamber (3') for generating heating gas.
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    同族专利:
    公开号 | 公开日
    UA106588C2|2014-09-25|
    EA018769B1|2013-10-30|
    BRPI0913910B1|2020-04-22|
    DE102008031165A1|2010-01-07|
    WO2010000383A1|2010-01-07|
    AU2009266109B2|2014-07-10|
    EA201100137A1|2011-06-30|
    BRPI0913910A2|2015-10-13|
    DE102008031165B4|2017-11-23|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE2149149C3|1971-10-01|1978-08-31|Kloeckner-Humboldt-Deutz Ag, 5000 Koeln|Method for regulating a distillation system for fine-grained material with several parallel-connected preheating devices for the feed material|
    US3891382A|1974-02-27|1975-06-24|Fuller Co|Apparatus for calcining raw material|
    US4260369A|1979-11-19|1981-04-07|Fuller Company|Method of converting a rotary kiln cement making plant to a calcining furnace cement making plant|
    DE3244943A1|1982-12-04|1984-06-07|Klöckner-Humboldt-Deutz AG, 5000 Köln|METHOD AND SYSTEM FOR BURNING CEMENT CLINKER|
    US4948362A|1988-11-14|1990-08-14|Georgia Kaolin Company, Inc.|Energy conserving process for calcining clay|
    DE102005057346A1|2005-12-01|2007-06-06|Khd Humboldt Wedag Gmbh|Plant for the production of cement clinker, and method of operating such a plant|
    DE102008023899B4|2008-05-16|2012-01-19|Polysius Ag|Process and plant for reducing CO2 emissions in the production of cement clinker|DE102011014498B4|2011-03-18|2013-04-25|Outotec Oyj|Process for the production of a clinker substitute, clinker substitute, use of the clinker substitute, cement clinker, cement, mortar or concrete, process for the production of the cement clinker or a building material and building|
    DE102013113475A1|2013-12-04|2015-06-11|Thyssenkrupp Ag|Process for the preparation of a pozzolanic or latent-hydraulic cement clinker substitute|
    DE102016005285B3|2016-04-30|2017-08-10|Khd Humboldt Wedag Gmbh|Method and apparatus for activating clays as an additive for concrete|
    WO2021023567A1|2019-08-02|2021-02-11|Thyssenkrupp Industrial Solutions Ag|Thermal treatment of mineral materials in a reducing atmosphere using alternative fuels|
    BE1027476B1|2019-08-02|2021-03-05|Thyssenkrupp Ind Solutions Ag|Substoichiometric calcination of mineral substances|
    WO2021140095A1|2020-01-09|2021-07-15|Thyssenkrupp Industrial Solutions Ag|Apparatus and process for thermal treatment of mineral solids|
    DE102020200186A1|2020-01-09|2021-07-15|Thyssenkrupp Ag|Process for heat treatment and color optimization of natural clays|
    BE1027979B1|2020-01-09|2021-08-10|Thyssenkrupp Ind Solutions Ag|Process for heat treatment and color optimization of natural clays|
    法律状态:
    2014-11-06| FGA| Letters patent sealed or granted (standard patent)|
    优先权:
    申请号 | 申请日 | 专利标题
    DE102008031165.0A|DE102008031165B4|2008-07-03|2008-07-03|Method for operating a plant for the production of calcined clay|
    DE102008031165.0||2008-07-03||
    PCT/EP2009/004271|WO2010000383A1|2008-07-03|2009-06-13|Process for operating a plant for producing calcined clay|
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