{"id":5721,"date":"2016-07-06T05:42:16","date_gmt":"2016-07-06T03:42:16","guid":{"rendered":"http:\/\/www.mtechnology.com.ua\/?p=5721"},"modified":"2023-12-14T14:49:52","modified_gmt":"2023-12-14T12:49:52","slug":"modernization-of-the-bf-gas-cleaning-systems","status":"publish","type":"post","link":"https:\/\/mtechnology.com.ua\/en\/modernization-of-the-bf-gas-cleaning-systems\/","title":{"rendered":"Modernization of the BF gas cleaning  systems"},"content":{"rendered":"\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-lq53lyhi-ae19279c881c879f6684f21af19fe1e0\">\n\n@media only screen and (min-width: 480px) and (max-width: 767px){ \n.flex_column.av-lq53lyhi-ae19279c881c879f6684f21af19fe1e0{\npadding:50px 0 0 0;\n}\n}\n\n@media only screen and (max-width: 479px){ \n.flex_column.av-lq53lyhi-ae19279c881c879f6684f21af19fe1e0{\npadding:50px 0 0 0;\n}\n}\n<\/style>\n<div  class='flex_column av-lq53lyhi-ae19279c881c879f6684f21af19fe1e0 av_one_full  avia-builder-el-0  el_before_av_one_full  avia-builder-el-first  first flex_column_div  '     ><section  class='av_textblock_section av-lq53kyji-1ec625f2715f0df8070fe2f80251fae0 '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='av-desktop-hide av-medium-hide avia_textblock'  itemprop=\"text\" ><h2 style=\"text-align: center;\"><span style=\"font-size: 18pt;\">Modernization of the BF gas cleaning systems<\/span><\/h2>\n<\/div><\/section><\/div>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-lq53n8xa-235e48352e9b599d3ab4de31befb6c13\">\n.flex_column.av-lq53n8xa-235e48352e9b599d3ab4de31befb6c13{\nborder-radius:0px 0px 0px 0px;\npadding:0px 0px 0px 0px;\n}\n\n@media only screen and (min-width: 480px) and (max-width: 767px){ \n.flex_column.av-lq53n8xa-235e48352e9b599d3ab4de31befb6c13{\npadding:30px 0 0 0;\n}\n}\n\n@media only screen and (max-width: 479px){ \n.flex_column.av-lq53n8xa-235e48352e9b599d3ab4de31befb6c13{\npadding:30px 0 0 0;\n}\n}\n<\/style>\n<div  class='flex_column av-lq53n8xa-235e48352e9b599d3ab4de31befb6c13 av_one_full  avia-builder-el-2  el_after_av_one_full  el_before_av_image  first flex_column_div av-zero-column-padding  column-top-margin'     ><style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-lq53sam9-5fe99ed4001d1eea13b0d3439caa382d\">\n#top .av_textblock_section.av-lq53sam9-5fe99ed4001d1eea13b0d3439caa382d .avia_textblock{\ntext-align:justify;\n}\n<\/style>\n<section  class='av_textblock_section av-lq53sam9-5fe99ed4001d1eea13b0d3439caa382d '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><p><span style=\"font-size: 18pt;\">Existing blast furnace gas cleaning systems at Iron and Steel Works include several successive treatment stages:<\/span><\/p>\n<p><span style=\"font-size: 18pt;\"><strong>stage 1<\/strong> &#8211; inertial dry-type dust catcher;<\/span><\/p>\n<p><span style=\"font-size: 18pt;\"><strong>stage 2<\/strong> &#8211; a scrubber with multi-tiered water spraying;<\/span><\/p>\n<p><span style=\"font-size: 18pt;\"><strong>stage 3<\/strong> &#8211; a high-pressure venturi pipe;<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-size: 18pt;\"><strong>stage 4<\/strong> &#8211; a throttle unit.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-size: 18pt;\"><!--more--><\/span><\/p>\n<p><span style=\"font-size: 18pt;\">Effectiveness of the first purification stage of a blast furnace dust catcher, operating at gravity principle, currently does not exceed <strong>40 &#8211; 50%<\/strong>. It catches only the largest dust fraction (&gt; <strong>100<\/strong> microns).<\/span><\/p>\n<p><span style=\"font-size: 18pt;\">The main blast furnace gas purification takes place at subsequent wet stages, where a huge amount of sludge is formed, requiring special preparation procedure for disposal.<\/span><\/p>\n<p><span style=\"font-size: 18pt;\">Existing sludge dewatering and disposal technologies are difficult and expensive, require large areas for sludge thickeners and sludge dumps, as well as significant operating expenditures that affect production profitability. The costs related to sludge disposal (handling, dewatering, etc.), even with the existing law efficiency dewatering system at the factory, are 8 to 15 times higher than the costs of dry dust disposal.<\/span><\/p>\n<p><span style=\"font-size: 18pt;\">Currently, the operational efficiency of gravity dust catchers does not exceed <strong>40 &#8211; 50%<\/strong>, which is clearly not enough both for the efficient operation of the entire blast furnace gas cleaning system, and for the efficient\u00a0 production waste (sludge) disposal.<\/span><\/p>\n<p><span style=\"font-size: 18pt;\">Analysis of design features of the existing blast furnace dust catchers has shown that they have all necessary conditions for upgrading them to combined inertial-cyclone-type units, the efficiency of which, by the output dust content in gases, is much higher than the existing one.<\/span><\/p>\n<p><span style=\"font-size: 18pt;\">The main idea of the proposed modernization of the blast furnace dust catchers is that two stages of cleaning are conventionally combined in the existing casing of the unit:<\/span><\/p>\n<ul>\n<li style=\"list-style-type: none;\">\n<ul>\n<li><span style=\"font-size: 18pt;\">an inertial dust precipitation stage in the central (axial) zone of the dust catcher body;<\/span><\/li>\n<li><span style=\"font-size: 18pt;\">a centrifugal-vortex dust separation stage in the peripheral (wall) zone of the dust catcher body.<\/span><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><span style=\"font-size: 18pt;\">The layout of such an upgraded dust catcher is shown in <strong>Fig. 1<\/strong>.<\/span> <span style=\"font-size: 18pt;\"> As we can see from the figure, the dust catcher modernization is quite simple and consists only of the partial re-equipment of its internal part with complete preservation of existing structures and auxiliary equipment.<\/span><\/p>\n<p><span style=\"font-size: 18pt;\">The degree of dust catching at the second (cyclone) stage of the dust catcher will be <strong>80 &#8211;<\/strong> <strong>90%<\/strong>. Moreover, the overall performance of the dust catcher is expected to be at the level of <strong>90 &#8211; 95%<\/strong>.<\/span><\/p>\n<p><span style=\"font-size: 18pt;\">The collected dust settles in the bunker part of the dust hopper, from where it is periodically forwarded through the existing dust-removal system to the consumer (sinter plant).<\/span><\/p>\n<p><span style=\"font-size: 18pt;\">According to calculations, by the degree of dust collecting of the upgraded dust catcher at the level of <strong>90%<\/strong>, the output of sludge from wet cleaning stages is reduced by <strong>3-4<\/strong> times and makes <strong>~ 15-20<\/strong> t \/ day from one blast furnace.<\/span><\/p>\n<p><span style=\"font-size: 18pt;\">At that, the zinc content in the sludge increases proportionally and can reach (other conditions being equal) <strong>20-30%<\/strong>, which allows its efficient use as a commercial product for zinc production. In any case, the iron content in this sludge will be significantly reduced, and its disposal in the own production is unpractical.<\/span><\/p>\n<p><span style=\"font-size: 18pt;\">This sludge should be taken out of the production cycle, and it will effectively remove zinc from the turn-over, prevent its accumulation in circulating products and stabilize the situation. Moreover, as a result of the dust catcher modernization, the amount of <strong>Zn<\/strong>-containing sludge that needs to be taken out of circulation will sharply decrease (<strong>3-4<\/strong> times) and iron losses will be minimal.<\/span><\/p>\n<\/div><\/section><\/div>\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-lq53oz0u-b99742f195b266ed52597ea5d40456ef\">\n@keyframes av_boxShadowEffect_av-lq53oz0u-b99742f195b266ed52597ea5d40456ef {\n0%   { box-shadow:  0 0 0 0 ; opacity: 1; }\n100% { box-shadow:  0 0 10px 0 ; opacity: 1; }\n}\n.avia-image-container.av-lq53oz0u-b99742f195b266ed52597ea5d40456ef img.avia_image{\nbox-shadow: 0 0 10px 0 ;\n}\n.avia-image-container.av-lq53oz0u-b99742f195b266ed52597ea5d40456ef .av-image-caption-overlay-center{\ncolor:#ffffff;\n}\n<\/style>\n<div  class='avia-image-container av-lq53oz0u-b99742f195b266ed52597ea5d40456ef av-styling- avia_animated_image av-animated-when-visible-95 pop-up avia-align-center  avia-builder-el-4  el_after_av_one_full  el_before_av_textblock  av-img-box-shadow av-box-shadow-not-animated'   itemprop=\"image\" itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/ImageObject\" ><div class=\"avia-image-container-inner\"><div class=\"avia-image-overlay-wrap\"><img fetchpriority=\"high\" class='wp-image-4315 avia-img-lazy-loading-not-4315 avia_image shadow-not-animated' src='https:\/\/mtechnology.com.ua\/wp-content\/uploads\/2016\/07\/ziclon1111-min.jpg' alt='' title=''  height=\"700\" width=\"495\"  itemprop=\"thumbnailUrl\"  \/><\/div><\/div><\/div><\/p>\n<section  class='av_textblock_section av-lq53prze-fd03374363e6adf552c79f483d03f7e0 '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><p style=\"text-align: left;\"><span style=\"font-size: 18pt;\"><strong>1.<\/strong> Supporting metal structures;<\/span><\/p>\n<p style=\"text-align: left;\"><span style=\"font-size: 18pt;\"><strong>2.<\/strong> Block-type multi-cyclone element;<\/span><\/p>\n<p style=\"text-align: left;\"><span style=\"font-size: 18pt;\"><strong>3.<\/strong> Exhaust pipes;<\/span><\/p>\n<p style=\"text-align: left;\"><span style=\"font-size: 18pt;\"><strong>4.<\/strong> Dust hopper;<\/span><\/p>\n<p style=\"text-align: left;\"><span style=\"font-size: 18pt;\"><strong>5.<\/strong> Separator shell.<\/span><\/p>\n<\/div><\/section>\n","protected":false},"excerpt":{"rendered":"<p>Existing blast furnace gas cleaning systems at Iron and Steel Works include several successive treatment stages: stage 1 &#8211; inertial dry-type dust catcher; stage 2 &#8211; a scrubber with multi-tiered water spraying; stage 3 &#8211; a high-pressure venturi pipe; stage 4 &#8211; a throttle unit.<\/p>\n","protected":false},"author":2,"featured_media":4315,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[32],"tags":[],"class_list":["post-5721","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-stati"],"_links":{"self":[{"href":"https:\/\/mtechnology.com.ua\/en\/wp-json\/wp\/v2\/posts\/5721","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mtechnology.com.ua\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mtechnology.com.ua\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mtechnology.com.ua\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/mtechnology.com.ua\/en\/wp-json\/wp\/v2\/comments?post=5721"}],"version-history":[{"count":0,"href":"https:\/\/mtechnology.com.ua\/en\/wp-json\/wp\/v2\/posts\/5721\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/mtechnology.com.ua\/en\/wp-json\/wp\/v2\/media\/4315"}],"wp:attachment":[{"href":"https:\/\/mtechnology.com.ua\/en\/wp-json\/wp\/v2\/media?parent=5721"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mtechnology.com.ua\/en\/wp-json\/wp\/v2\/categories?post=5721"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mtechnology.com.ua\/en\/wp-json\/wp\/v2\/tags?post=5721"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}