• 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:
    By a triple-acting cyclone combination consisting of cyclone (4) with integrated fine filter (6) and gas cooler (5) is effective in vacuum generation by steam jet ejector pumps or mechanical pumps in steel degassing processes effective cleaning and cooling of the sucked exhaust gas flow.
    公开号:AT511613A4
    申请号:T71/2012
    申请日:2012-01-24
    公开日:2013-01-15
    发明作者:Johannes Dipl Ing Obitz；Michael Dipl Ing Luven；Arno Dipl Ing Luven
    申请人:Inteco Special Melting Technologies Gmbh；
    IPC主号:
    专利说明:

    «· * · · *«
    Process and plant for exhaust gas purification in vacuum steel treatment processes
    In the so-called secondary metallurgical processes, in particular in the oxygen blowing processes such as VOD, RH-TB, DETEM, the liquid steel is treated under vacuum. The so-called steel degassing and the production of low-carbon steels by blowing oxygen are treatment variants that are used worldwide.
    The systems for carrying out the aforementioned methods consist essentially of two core components. The recipient on the one hand, are treated in the ladles with liquid steel to over 300 t under vacuum and on the other hand, the vacuum generator, which is connected via a suction line with the recipient. In the processes which take place under reduced pressure of between 200 and 0.6 mbar, dissolved gases and reaction gases are liberated, which are extracted by the vacuum generator while maintaining the respective absolute working pressure. This entrained entrained or formed by evaporation and condensation metallic and non-metallic dust particles in the exhaust gas flow. Depending on the process variant, the dust at an exhaust gas temperature up to 500 ° C and a grain size of 0.5 μ to > 100 μ in a mass accumulation of 3 - 4 kg of dust per ton of liquid steel. Today, two different types of vacuum pumping systems are in use for the high suction volumes at low suction pressure. On the one hand, it is the largely dust-insensitive steam jet ejector pumps, which have a higher energy requirement, and on the other, the dust-prone mechanical pump sets.
    In systems in which the vacuum is generated by means of multi-stage steam jet ejector, the dust load in the exhaust gas is no direct functional impairment. The exhaust gases are compressed here via multi-stage ejectors to atmospheric pressure, with the dust contained in the exhaust gas to about 5 - 10% attach to the walls of the pipes and ejectors and the remaining 90 - 95% of the circulating cooling water in the injection condensers
    Page 1 of 5 «· **« · · · · · ··················································································································································································· High expenditures * for 'labor-intensive' manual cleaning as well as for the filtration of the circulating water are the unpleasant consequence here. The vacuum generation by steam jet is also characterized by a high steam consumption, which must be generated locally in a steam generator high power, which causes high costs.
    By contrast, the operation of mechanical vacuum pumps is considerably more energy-efficient, but they are sensitive to high temperatures and the dust in the sucked-in gas. For this reason, gas / dust separation and gas cooling between the recipient and the vacuum pump are always prescribed for mechanical vacuum pumps. In the previously installed systems, the extracted gas is first passed before entering the vacuum pump through a cyclone, in which a deposition of coarse particles takes place, then the gas is passed for cooling in a gas cooler and passes from there through a fine dust filter for depositing smallest particles.
    The components listed above are installed one behind the other in the vacuum line, which apart from the space required has a corresponding length of the vacuum line result. This contradicts the demand for the shortest possible line between recipient and vacuum pump set in order to achieve the greatest possible efficiency in the vacuum generation in the recipient.
    The problems described above with the use of both steam jet ejector pumps and mechanical pumps can be largely eliminated by the present invention.
    The object of the invention is that all necessary process steps such as dedusting, fine filtering and gas cooling in a vacuum-tight compact cyclone with built-in fine dust filter with connected gas cooler perform, wherein the entering into the cyclone raw gas is forced by helical baffles in a rotating motion, whereby on the one hand the Grobstaubabscheidung is favored and on the other hand, a precooling of the gas flow is effected on the outer jacket of the built-in heat exchanger. The gas is then passed through the fine dust filter equipped with micro-stainless steel filter mats and the connected filters
    Page 2 of 5 «« water-cooled gas cooler and led via the gas funnel into the vacuum gas * to * * * the vacuum pumps.
    Due to the compact design, the length of the vacuum line is considerably shortened, whereby the pressure loss can be kept low.
    The assembled filter cooling unit is loosely supported on the exhaust funnel, so that a simple expansion upwards is possible.
    The cyclone has at the lower funnel-shaped end of a vacuum-tight dust flap over which the resulting coarse and fine dust can be discharged.
    The fine filter is cleaned pneumatically using inert gas. Regardless, a separate flooding of the cyclone interior by means of inert gas is advantageous.
    Fig. 1 shows a current state of the art arrangement with a in the suction line (2) between the recipient (1) and vacuum generator (3) built-in cyclone (4) for coarse dedusting, a separately arranged gas cooler (5) and a subsequently arranged fine filter (6). The fine filter (6) is arranged here after the gas cooler (5), since these are often equipped with cloth filter bags, which do not endure higher gas temperatures.
    Fig. 2 shows an inventive arrangement with a in the cyclone (4) integrated dust filter (6) and gas cooler (5).
    Fig. 3 shows the detailed structure of a cyclone separator according to the invention with built-in fine dust filter (6) and gas cooler (5).
    The apparatus unit consists of the cyclone (4) for the pre-dedusting, the water-cooled shell-and-tube heat exchanger (5) for the gas cooling and the filter element (6) for the fine filtration.
    Filter element (6) and heat exchanger (5) are interconnected and arranged concentrically in the vacuum-tight cyclone housing (4) such that the lower part (7) of the heat exchanger (5) is conical and loose in the conical counter funnel (8) of the gas outlet nozzle (9) seated. Flierdurch is after opening the cyclone cover (10) and after releasing the water inlet and
    Page 3 of 5 • ·
    Exit connections (11) and (12) a simple removal door warning purposes " * guaranteed. Depending on requirements, the filter element (6) can be removed without the gas cooler (5). For the dust discharge, a vacuum-tight closure flap (13), preferably with a pneumatic or hydraulic drive, is installed on the lower cyclone cone (16). To support the dust discharge, a vibrator with electric or pneumatic drive is attached (14).
    The dust-laden hot gas is guided by the suction force of the vacuum generator in the tangentially arranged inlet nozzle (15). Due to the high inlet velocity and the resulting rotational movement, the centrifugal forces act on the larger particles, which are then collected in a known manner in the cyclone cone (16). Screw-shaped baffles (17) on the inner wall of the cyclone housing (4) support the deposition process. Partial cooling of the gas through the water-cooled jacket (18) of the heat exchanger (5) is already achieved by the initially vertically directed gas flow.
    The entire gas volume with the residual dusts is sucked through the filter element (6) and then through the tube bundle heat exchanger (5). The
    Filter element (6) preferably consists of close-meshed micro-stainless steel filter mats and is matched to the fine particle size. For the cleaning of the filter (6) pneumatic impulse shocks, preferably by means of inert gas, from the interior of the filter in the direction of plant downtime
    Cyclone housing (4) provided, which promote the dust down into the cyclone cone (16).
    The water-cooled heat exchanger (5) is designed according to the cross flow principle - gas through the pipes, water around the pipes. The cooled and shrunk in volume clean gas leaves the cyclone (4) in the direction of vacuum generator (3) through the gas outlet nozzle (9). Depending on the particle size distribution, it is planned to rotate the central filter and cooler unit in the cyclone housing by 180 °.
    At the end of the process, the flooding of the entire system usually takes place with atmospheric air. The high level of fines may be due to 02 enrichment at the grain surface for autoignition or in concatenation with other operating conditions, e.g. Spark with sufficient capacity to explode
    Page 4 of 5 * »lead. Therefore, at the end of the process, the cyclone compartment * is separated from the remaining system volume and flooded with inert gas.
    Page 5 of 5
    权利要求:
    Claims (7)
    [1]


    * * · · «* * * * * * * * * * * * * ··· PATENT CLAIMS 1. Method for exhaust gas purification in degassing with steam jet ejector pumps or mechanical vacuum pumps, characterized in that the coming of the degassing (1) Crude gas is passed into a cyclone separator (4) and that the process steps coarse and fine dust separation and gas cooling in this cyclone are carried out one behind the other in such a way that the gas stream after coarse cleaning directly via a Zyklonabscheider (4) built-in fine dust filter (6) and then is guided by a gas cooler (5) flanged to the fine filter into a gas line (2) connected to the vacuum pumps (3).
    [2]
    2. The method according to claim 1, characterized in that from the entering into the cyclone (4) raw gas by a screw-shaped by baffles coarse dust particles are deposited and on the other hand, the outer wall (18) of a heat exchanger (5) is flowed around, whereby a precooling the exhaust stream is reached.
    [3]
    3, Device for carrying out the method according to claims 1 and 2, characterized in that in a cyclone separator (4) with gas inlet nozzle (15) and dust discharge (13) a fine dust filter (6) with flanged gas cooler (5) with a with the Vacuum pump (3) connected gas outlet line (9) is installed so that the entering into the cyclone (4) raw gas from this forcibly on the fine dust filter (6) and subsequent gas cooler (5) to the vacuum pump (3) is passed.
    [4]
    4. Apparatus according to claim 3, characterized in that in the cyclone (4) helical baffles (17) are mounted.
    [5]
    5. Apparatus according to claim 3 or 4, characterized in that in the cyclone (4) built-in elements fine dust filter (6) and gas cooler (5) are interconnected and loosely on the Abgastrichter (7) sit. Page 1 of 2 • *
    [6]
    6. Device according to claims 3 or 5, characterized in that the fine filter (6) is constructed from micro-stainless steel filter mats and can be pneumatically cleaned by means of inert gas.
    [7]
    7. Device according to claims 3 or 4, characterized in that the cyclone (4) has a vacuum-tight dust flap (13) and the Staubaustragsunterstützung via a vibrator (14) with electric or pneumatic drive. Page 2 of 2
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    法律状态:
    2020-09-15| MM01| Lapse because of not paying annual fees|Effective date: 20200124 |
    优先权:
    申请号 | 申请日 | 专利标题
    ATA71/2012A|AT511613B1|2012-01-24|2012-01-24|METHOD AND APPARATUS FOR EXHAUST GAS CLEANING IN VACUUM STEEL TREATMENT PROCESSES|ATA71/2012A| AT511613B1|2012-01-24|2012-01-24|METHOD AND APPARATUS FOR EXHAUST GAS CLEANING IN VACUUM STEEL TREATMENT PROCESSES|
    PCT/EP2013/051224| WO2013110647A1|2012-01-24|2013-01-23|Method and arrangement for waste-gas purification in vacuum steel treatment processes|
    US14/373,643| US20150033944A1|2012-01-24|2013-01-23|Method and arrangement for waste-gas purification in vacuum steel treatment processes|
    EP13704886.4A| EP2806976B1|2012-01-24|2013-01-23|Method and arrangement for waste-gas purification in vacuum steel treatment processes|
    JP2014553698A| JP2015511172A|2012-01-24|2013-01-23|Waste gas purification method and equipment in steel vacuum treatment process|
    CN201380005521.XA| CN104144750A|2012-01-24|2013-01-23|Method and arrangement for waste-gas purification in vacuum steel treatment processes|
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