描述

一般情況下，雜質(zhì)有增加靜電的趨勢。但如雜質(zhì)能降低原有材料的電阻率，加入雜質(zhì)則有利于靜電的泄漏。液體內(nèi)含有高分子材料(如橡膠、瀝青)的雜質(zhì)時，會增加靜電的產(chǎn)生。液體內(nèi)含有水分時，在液體流動、攪拌或噴射過程中會產(chǎn)生靜電。液體內(nèi)水珠的沉降過程中也會產(chǎn)生靜電。如果油罐或油槽底部積水，經(jīng)攪動后可能由靜電引發(fā)爆炸事故。

2)工藝設備和工藝參數(shù)的影響

接觸面積愈大，產(chǎn)生靜電愈多，接觸壓力愈大或摩擦愈強烈，會增加電荷的分離，以致產(chǎn)生較多的靜電。工藝速度越高，產(chǎn)生的靜電越強。下列是容易產(chǎn)生和積累靜電典型工藝過程：

①紙張與輥軸摩擦、傳動皮帶與皮帶輪或輥軸摩擦等;橡膠的碾制、塑料壓制、上光等;塑料的擠出、賽璐珞的過濾等。

②固體物質(zhì)的粉碎、研磨過程;粉體物料的篩分、過濾、輸送、干燥過程;懸浮粉塵的高速運動等。

③在混合器中各種高電阻率物質(zhì)的攪拌。

④高電阻率液體在管道中流動且流速超過1m/s;液體噴出管口;液體注入容器發(fā)生沖擊、沖刷和飛濺等。

⑤液化氣體、壓縮氣體或高壓蒸氣在管道中流動和由管口噴出，如從氣瓶放出壓縮氣體、噴漆等。

五、射頻電磁場危害

射頻指無線電波的頻率或者相應的電磁振蕩頻率，泛指100kHz以上的頻率。射頻傷害是由電磁場的能量造成的。射頻電磁場的危害主要有：

1.在射頻電磁場作用下，人體因吸收輻射能量會受到不同程度的傷害。過量的輻射可引起中樞神經(jīng)系統(tǒng)的機能障礙，出現(xiàn)神經(jīng)衰弱癥候群等臨床癥狀;可造成植物神經(jīng)紊亂。出現(xiàn)心率或血壓異常，如心動過緩、血壓下降或心動過速、高血壓等;可引起眼睛損傷，造成晶體渾濁，嚴重時導致白內(nèi)障;可使睪丸發(fā)生功能失常，造成暫時或永久的不育癥，并可能使后代產(chǎn)生疾患;可造成皮膚表層灼傷或深度灼傷等。

2.在高強度的射頻電磁場作用下，可能產(chǎn)生感應放電，會造成電引爆器件發(fā)生意外引爆。

歐美品牌停產(chǎn)的，常用的“PLC”備品備件

我司產(chǎn)品應用于以下領域：

1,《發(fā)電廠DCS監(jiān)控系統(tǒng)》

2,《智能平鋼化爐系統(tǒng)制造》

3,《PLC可編程輸送控制系統(tǒng)》

4,《DCS集散控制系統(tǒng)》
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5,《智能型消防供水控制系統(tǒng)》

6,《化工廠藥液恒流量計算機控制系統(tǒng)》

7,《電氣控制系統(tǒng)》造紙,印染生產(chǎn)線,變電站綜合自動化控制系列

本特利，英維思，伍德沃德，福克斯波羅、西屋、瑞恩、施耐德莫迪康、ABB、AB、西門子、摩托羅拉、GE發(fā)那科、安川、博世力士樂，ACSO，力士樂等各大品牌的DCS系統(tǒng)配件，機器人系統(tǒng)配件，大型伺服系統(tǒng)備件。

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