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        十六、糧食立筒倉粉塵爆炸的綜合防治措施

        十六、糧食立筒倉粉塵爆炸的綜合防治措施

        • 分類:常見問題
        • 作者:
        • 來源:
        • 發布時間:2013-05-09 18:10
        • 訪問量:

        概要:隨著糧食立筒倉應用技術的日臻完善,尤其鋼板立筒倉已成為糧油行業的主流倉型。但是,近20年來糧食立筒倉在糧油加工廠、飼料廠發生的粉塵爆炸事故率呈上升趨勢。據報道,在一些具有先進技術設備的發達國家,粉塵爆炸現象都很嚴重。

        十六、糧食立筒倉粉塵爆炸的綜合防治措施

        概要:隨著糧食立筒倉應用技術的日臻完善,尤其鋼板立筒倉已成為糧油行業的主流倉型。但是,近20年來糧食立筒倉在糧油加工廠、飼料廠發生的粉塵爆炸事故率呈上升趨勢。據報道,在一些具有先進技術設備的發達國家,粉塵爆炸現象都很嚴重。

        • 分類:常見問題
        • 作者:
        • 來源:
        • 發布時間:2013-05-09 18:10
        • 訪問量:
        詳情

        隨著糧食立筒倉應用技術的日臻完善,尤其鋼板立筒倉已成為糧油行業的主流倉型。但是,近20年來糧食立筒倉在糧油加工廠、飼料廠發生的粉塵爆炸事故率呈上升趨勢。據報道,在一些具有先進技術設備的發達國家,粉塵爆炸現象都很嚴重。粉塵爆炸不僅帶來環境污染,更重要是造成嚴重人身傷亡事故和重大經濟損失。因此,采取安全有效的防治措施,防止粉塵爆炸,非常必要,應引起人們的足夠重視。筆者認為,從設計入手,考慮各種影響因素,采取綜合防治措施,以達到有效控制粉塵、防止粉塵爆炸事故的發生。

        1.加強管理,提高認識,增強責任心

        1.1加強筒倉粉塵爆炸及安全知識的教育,積極開展安全訓練,強化防塵、防火防爆意識,制定嚴格的安全工作制度并嚴格遵守,嚴格按照操作規程操作,積極搞好庫區內外清潔衛生,保持筒倉內良好的通風條件。同時認真做好日常安全管理工作。

        1.2認真做好全面的安全檢查工作,必須認真分析粉塵爆炸的各種危險性因素,安全檢查要具有全面性和針對性,發現問題及時解決,決不留任何隱患。

        1.3加強安全設施的的配備與管理。庫區內要有完備的消防系統;操作人員要熟悉設備及使用工具的性能、使用條件和操作要領,并做好養護工作;嚴禁在不具備帶火作業條件下,在庫區內進行電氣割焊等易產生熱源的作業。必須進行此類作業時,要采取較為安全的預防措施。作業結束后,要做徹底檢查,消除一切隱患,確保筒倉儲糧安全。

        2.從設計入手,盡量消除影響粉塵爆炸的因素

        2.1做好庫區整體規劃設計,遵循整體設防的原則。生產過程盡量密閉化、自動化;對具有爆炸危險的建筑物、機械設備等應設置特制的安全壁和隔離帶(如:防火墻、綠化帶、防火門等),并適當采用防火材料;對避雷、接地、防靜電及消防設計,應全面考慮,采取安全可靠的預防措施。

        2.2在立筒倉的結構設計時,立筒倉應設置通風窗、泄爆口、檢查孔等安全裝置,以保持倉內常壓;筒倉及料倉內應設置料位器,以便發出滿倉信號,防止提升機、輸送機堵塞;對局部易損壞的場所(如:通廊、棧橋等),設置防爆窗,以達到泄爆的目的;采用避雷針或避雷帶等。

        2.3通風除塵工藝設計。合理的通風除塵工藝對防止粉塵爆炸起到積極作用。設計時選擇合適的參數和方式至關重要。風管風速以15-17m/s為佳;在粉塵產生點直接收集,經除塵器凈化后排至室外;采用局部排風和吸風相結合的方式,全面通風或自然通風(利用外風壓或溫差)。同時,考慮到吸風管內負壓的均勻性,糧粒、塵粒、設備及其相互之間碰撞、摩擦,管道內速度的均勻性等,出風口處應設置風帽。設計風網時,去石、清理等設備應獨立設計風網,輸送提升系統宜設組合風網。通風除塵系統應與相關的電氣設備聯鎖。

        盡量采用吸塵罩、防護罩。選擇合適的吸點位置及風罩結構形式,尤其對下糧部位,做到下糧時與外界形成風帶,以杜絕粉塵飛揚。在靠近塵源處安裝吸塵罩,使粉塵限制在較小的范圍內,即保證吸風罩內有足夠的負壓,又不會引起粉塵擴散。罩內氣流均勻,收縮角不大于60°,風速一般選取3-5m/s(糧粒),0.5-1.5m/s(粉料)。粉塵濃度大,比重大,吸口與塵源距離長時,吸口風速應取大值,反之取小值。否則會使粉塵飛揚擴散嚴重。吸塵罩四周加法蘭后,應減少無效氣流,吸風量可節省25%,設計時風速可采用0.5-2.5m/s。因工藝限制,機械設備無法密封時可選用敞口吸風罩和外部吸風罩。風機等吸風口處應有防護罩。

        2.4糧食輸送工藝的設計中,工藝流程要簡短,設備選用布置合理,具有防塵防爆配套裝置并盡量密封,盡量采用磁選設備。含塵濃度較高部位宜采用二次凈化。皮帶輸送機的進料端、拋料端必須設計合理的防塵罩。倉頂的輸送機因采用卸料小車,塵源是流動的,應設計合理的防塵裝置。斗式提升機宜在底座處安裝吸風裝置并采用具有導電性和非燃性的膠帶,畚斗宜采用塑料型。螺旋輸送機結構較嚴密,一般不設防塵裝置,但糧食落差較大時,應在吸風罩下部設擴大箱。斗式提升機,輸送機等輸送設備應裝配速度檢測裝置、噴霧消防裝置、輸送帶打滑和跑偏等裝置。在氣候和作業條件允許時,倉頂刮板、提升機頭、除塵器等露天布置。所有機電設備采取接地措施,以防靜電積累。

        2.5電器設計中,燈具、電線選用正確的規格型號,應采用防爆型,達到《爆炸和火災危險環境電力裝置設計規范》第三章的要求及相關標準。電機宜采用減振裝置,減少粉塵飛揚和擴散。設計時,應遵循整體設防的原則,做好防塵防爆的配套設計。

        3.采用防塵防爆新技術

        噴霧抑塵技術不僅完善了當前粉塵控制方法,而且拓寬了現有的粉塵防治新思路。該技術對于粒度30 μm以下的細微粉塵起到較好的抑制效果,可將粉塵及工藝過程中的再生性粉塵吸附于谷物表面,避免飛揚,有利于從根本上控制粉塵爆炸。據有關資料介紹,以美國埃索公司生產的白油作為防塵劑,使用劑量為物料流量的0.02%進行噴霧,可使糧食中的粉塵得到有效控制。世界上,許多發達國家已在糧食儲運管理中廣泛應用這種新技術,取得了較好的效果。但是該技術需要進一步研究和完善。另外,應用《噴灑水霧防爆除塵技術》,可有效地抑制粉塵飛揚,抑塵效果較好,較適合于糧油加工廠和糧食中轉庫。

        另外,為有效地預防糧食立筒倉的粉塵爆炸,在積極采取除塵防爆措施的同時,還應加強筒倉使用過程中除塵防爆技術管理和技術培訓工作。

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