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广州省东莞金属粉尘作业现场防爆電氣檢測分区和依据标准

2021-5-6 15:31:11

在粉塵作業環境中，往往會存在各類粉塵和粉塵雲堆積，當這些粉塵雲堆積到一定的厚度，並遇到高溫、火花、靜電、摩擦、雷電等條件，在一定的密閉空間會發生爆炸事故。2014.8.2昆山金屬粉塵爆炸、2015.6.27台灣遊樂園面粉爆炸事故，2019.11.1廣東中山的鎂合金粉爆炸事故……一則則觸目驚心的粉塵爆炸事故給人們生命和財産造成嚴重的危害和損失，也給安全生産事故敲響了警鍾。

在可燃性粉塵中，金屬粉塵是屬于最爲危險的爆炸性粉塵。常見的金屬粉塵包括：鋁粉、鋅粉、钛粉、锆粉等。這類金屬粉塵都是屬于導電性粉塵，屬于ⅢC類。最危險級別的爆炸性粉塵。如鋁粉的高溫表面堆積粉塵層（5mm）的引燃溫度爲320℃，粉塵雲的引燃溫度爲590℃，粉塵平均粒徑爲5-15μm，爆炸下限爲37-50g/m3。

按照IEC的標准，可燃性粉塵危險場所區域劃分：20區、21區和22區

1、20區：指空氣中爆炸性環境以可燃性粉塵雲的狀態連續出現，長時間存在或者頻繁出現的場所。在金屬粉塵場所中20區包括管道、除塵器內部；持續進行金屬制品磨削、打磨、抛光、抛丸噴砂的作業部位和機械加工設備內部的粉塵收塵系統及裝置等。

2、21區：指在正常操作過程中，空氣中爆炸性環境以可燃性粉塵雲的狀態可能出現或偶爾出現的場所。在金屬粉塵場所中21區往往是指非持續進行鋁鎂制品磨削、打磨、抛光的作業部位；沒有GB/T16758的要求設置吸塵排風罩，存在粉塵飄散的整個廠區；除塵系統管道、除塵器的清灰口及清灰口作業周圍2米區域；機械加工設備的粉塵收塵系統及裝置的清灰口及清灰口作業周圍2米區域等；

3、22區：在正常操作過程中，空氣中爆炸性環境以可燃性粉塵雲的狀態不可能出現的場所，如果出現也僅僅是短時間存在的場所。範圍包括超出21區周圍3米的距離（垂直向下延伸至地面或樓板水平面）；存在兩處（含兩處）以上的22區的整個廠房。

定期对这些爆炸性粉尘环境进行#防爆電氣檢測#和防爆检查是防止和降低爆炸事故发生率的手段之一。国家对这类型场所的防爆检查出台了一系列的标准，并规定必须3年/次由具备相关资质的第三方检测机构对此进行检测，以此规范其现场东莞防爆電氣檢測的相關技術要求。主要依據標准有：

1、GB 15577-2007《粉尘防爆安全规程》

2、GB 50016-2006《建筑设计防火规范》

3、GB 50058-2014《爆炸危险环境电力装置设计拠范》

4、GB 3836.1-2010《爆炸性环境第部分通用要求》

5、GB/T 17919-2008《粉尘爆炸危险场所用收尘器防爆导则》

6、GB 17269-2003《铝镁粉加工粉尘防爆安全规程》，针对镁铝加工场所

7、AQ3009-2007《危險場所電氣防爆安全規範》

8、《嚴防企業粉塵爆炸五條規定》(國家安全監管總局令第68號)安全操作要點等

…

安全無止境，防範不可松懈！只有國家、企業、個人都對粉塵爆炸事故重視起來，做到防患于未然，才能最大限度降低事故的發生。

东莞防爆電氣檢測

以上文章由东莞防爆電氣檢測机构-國瑞檢測整理發布，文章鏈接：/html/news59.html。國瑞檢測是通過國家檢驗檢測機構資質認定，ISO9001質量管理體系、ISO14001環境管理體系、OHSAS18001職業健康安全管理體系、企業信用“AAA”級等認證。

國瑞檢測承接全國各地防爆電氣檢測、有毒/可燃氣體探測器檢測、防靜電檢測等业务，欢迎新老客户前来咨询：4000881280，手機：18118125550（田经理） 18914965888（王经理）

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"Yes, men, what the gentleman says is true." But a profounder analysis of experience is necessary before we can come to the real roots of Plato’s scheme. It must be remembered that our philosopher was a revolutionist of the most thorough-going description, that he objected not to this or that constitution of his time, but to all existing consti254tutions whatever. Now, every great revolutionary movement, if in some respects an advance and an evolution, is in other respects a retrogression and a dissolution. When the most complex forms of political association are broken up, the older or subordinate forms suddenly acquire new life and meaning. What is true of practice is true also of speculation. Having broken away from the most advanced civilisation, Plato was thrown back on the spontaneous organisation of industry, on the army, the school, the family, the savage tribe, and even the herd of cattle, for types of social union. It was by taking some hints from each of these minor aggregates that he succeeded in building up his ideal polity, which, notwithstanding its supposed simplicity and consistency, is one of the most heterogeneous ever framed. The principles on which it rests are not really carried out to their logical consequences; they interfere with and supplement one another. The restriction of political power to a single class is avowedly based on the necessity for a division of labour. One man, we are told, can only do one thing well. But Plato should have seen that the producer is not for that reason to be made a monopolist; and that, to borrow his own favourite example, shoes are properly manufactured because the shoemaker is kept in order by the competition of his rivals and by the freedom of the consumer to purchase wherever he pleases. Athenian democracy, so far from contradicting the lessons of political economy, was, in truth, their logical application to government. The people did not really govern themselves, nor do they in any modern democracy, but they listened to different proposals, just as they might choose among different articles in a shop or different tenders for building a house, accepted the most suitable, and then left it to be carried out by their trusted agents. We've accepted, so please don't object, Daddy dear. heat of the going they get so breathless and panting that they lose The young prince then goes on his way in search of the magical flower. He is about to rest awhile in a cavern, but at the moment when he lies down on a stone it is transformed into a monster made of bladder, which rears itself enraged in the air with a trumpet-cry. By good luck the king's son calls upon the aid of the prophet Suleiman, whom the dragon also reveres, and the pacified monster conveys Tazulmulook to the garden of Bakaoli, and, moreover, gives him a ring which will be a talisman in danger. But the minister still refused to see it. 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