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每日学一点环保知识:固(危)废人须知的十三条知识,硬 ...? 一、依据环境影响评价报告、批复及竣工环保验收文件,弄清本单位固体废物产生的环节、种类、数量及处置方式。 二、如实申报固体废物产生的种类、数量、处置方式。从即日起应将沾染危险废物的各类包装物、容器(废矿物油桶、废溶剂瓶和桶、检修产生的废油漆桶等);各环节产生的含矿物油废物(机泵产生的废润滑油、机修产生的废机油、废 液压油 、废导热油、含油污水及隔油后的废水、含油污泥和浮渣等);办公类废物(废含汞灯管、含油墨废墨盒/硒鼓等);检修产生的石棉废物;清洗容器设备过程中产生的残夜(渣);废气、废水处理产生的废 活性炭 等吸附介质及废弃的 离子交换树脂 ;自有运输车辆产生的废铅酸电池等;分析化验室产生的各类废液、冲洗废水、过期废溶剂、废弃的包装桶及试剂瓶等全部纳入申报范围。 三、规范建设危险废物贮存场所,依法进行环境影响评价,并完成“三同时”验收。危险废物贮存场所要按规定张贴危险废物管理制度和识别标志;包装容器或包装物上的危险废物标签要填写完整(特别是入库时间和数量);危险废物贮存库内不能放置一般固废和其他物品,危险废物要按照特性进行分类存放且摆放整齐。经营单位收集、贮存危险废物要符合国家环境保护标准,贮存时间不得超过1年,确需延长期限的,必须报当地环保部门批准。 四、准确记录固体废物出入库台账,及时填写并在包装物上贴好标签,确保标签上相关信息准确无误。 五、经营单位对收集的每一批危险废物都要进行危险特性分析,并存档备查。 六、严格按照《危险废物转移联单管理办法》填写转移联单。转移联单上危险废物的种类、数量、转移时间要与出入库台账相符合,特别注意危险废物代码、处置方式等信息的准确性。转移联单不能委托他人代替签字,并及时报当地环保部门备案。 七、有自行利用或处置设施的产废单位,对危险废物利用、处置设施要依法进行环境影响评价,并完成“三同时”验收,建立危险废物利用、处置台账,并按要求定期对有关污染物排放进行环境监测。 八、危险废物管理计划要有针对性,确实按照本单位的实际情况进行编制,并将第二条中所列的危险废物全部纳入管理计划进行管理。 九、危险废物应急预案的编制要准确实用,认真做好应急演练,演练影像资料存档备查。 十、完整保存职工培训记录、设备检修记录等。 十一、一般固体废物不能露天存放,保持厂区内卫生整洁。 十二、生产车间的环保治理设施要保持正常运行,确保各类污染物达标排放,委托环境监测的项目要全面,不能漏项。 十三、五种情况无须申领危废许可证(附案例) (一)产生危险废物的单位在其厂区(场所)内,自行或者委托第三方专业机构对本单位产生的危险废物进行利用或者处置。 案例: A公司产生危险废物废硫酸,目前在厂区内建设废酸中和设施,对废硫酸自行处置,A公司免于领取危险废物经营许可证; B公司产生的废液为危险废物,该废液可通过本公司自建的焚烧炉处置或委托第三方专业机构在B公司厂内建设焚烧装置(装置所有权属于B公司)专门处理该股废液,B公司免于领取危险废物经营许可证。 (二)在同一省级行政区内,同一母公司或集团公司所属的子公司之间使用共享设施,对各子公司产生的危险废物进行利用或者处置。 案例: C集团公司下有C1、C2……公司(位于同一省级行政区域内),C、C1、C2……公司可共享危险废物处置装置,均免于领取危险废物经营许可证。 (三)仅将位于同一工业园区内的特定企业产生的特定种类的危险废物作为生产原料进行定向利用。 案例: D1公司与D2公司位于同一工业园区内,D1公司产生的危险废物废酸,D2公司生产原料中可利用此特定废酸,D2公司定向接收D1公司的该股废酸,D2公司免于领取危险废物经营许可证。 (四)以技术研发、验证为目的对危险废物进行利用或者处置。 案例: E公司为危险废物利用或者处置技术研发机构,需要搜集相应的危险废物进行研究,寻找其最佳处置或者利用方法,E公司免于领取危险废物经营许可证。 (五)根据《国家危险废物名录》,可以实行豁免管理的危险废物经营活动。 对照《国家危险废物名录》(2016年版)属于豁免管理清单内的废物,可不按危险废物管理。前款所述免于领取危险废物经营许可证的具体范围和管理办法,由省、自治区、直辖市环境保护主管部门规定。以上免于领取危险废物经营许可证的情况,需要待省、自治区、直辖市环境保护主管部门出台相关细则后,方可实施。 查看更多 7个回答 . 4人已关注
甲醇企业生产过程中配套业务? 和 甲醇 企业有哪些配套业务可以做?有个朋友在煤化工企业,年产60万吨甲醇。年销售收入20亿元,利润4亿元。有什么可以和他做的生意?长期 稳定的。比如搞个和甲醇生产过程中业务相关的厂子,可投资金200~300万。请师兄,师姐指点指点,非常感谢!!查看更多 0个回答 . 5人已关注
图标什么意思? 图标什么意思?查看更多 13个回答 . 1人已关注
因锁斗冲洗水罐上水慢而延迟锁斗下渣都有哪些危害? 我们的渣锁斗是自动控制的,每30分钟下一次渣,最近因水泵问题,使冲洗水罐的液位不能按时满足,造成下渣计时钟到时集渣阀切断而等待液位的情况,此时锁斗 循环泵 自身循环,渣沉集在集渣阀上部管道中,这样长时间的运行下去会对设备有哪些危害?查看更多 5个回答 . 3人已关注
职业病防治:消除高温职业危害的措施? 消除高温职业危害的措施?查看更多 7个回答 . 3人已关注
水煤浆气化事故案例汇编? 各位大侠! 哪位有水煤浆气化装置及后续工序事故案例!发来共享!不吝赐教!好么! liuyoufeng06@sina.com 查看更多 0个回答 . 4人已关注
航天炉中电动纤维分离器的作用是啥? 航天炉中调动纤维 分离器 的作用是啥? 查看更多 2个回答 . 5人已关注
化工填料哪里生产品种齐全质量过硬? 我公司 甲醇 项目的填料要招标了,化工填料哪里生产的品种齐全质量过硬?查看更多 8个回答 . 1人已关注
翻译求助-一个协议,怎么翻译都很别扭,请大家帮忙? "Confidential Information" as used herein shall mean any and all information embodied in data, technical knowledge, specifications, chemical make-up, equipment, materials and/or other communications, relating to Disclosing Party and/or its parent company and any of its direct or indirect subsidiaries, the Technology (including but not limited to the nature or the existence of research and/or development projects, formulas, designs, products, processes, stocks, manufacture, costs, prices, sales plans, customer lists and all data connected herewith) and/or the Project, including but not limited to the design, construction or operation of the facilities, equipment and/or feedstock and/or products and/or business of the Disclosing Party, (a) that has been disclosed or provided by the Disclosing Party to the Receiving Party in written, graphical or other tangible form including but not limited to information disclosed previously to Receiving Party or, (b) that may be learned, acquired or derived by the Receiving Party during any examination of the said information or during any negotiation or discussions concerning the Project, or, (c) that may be prepared by the Receiving Party which contains or otherwise reflects the said information or any results pursuant to the examination of the information. 1.2 “Agreement” as used herein shall mean this, the present confidentiality agreement. 1.3 ”Affiliate(s)” of a party as used herein shall mean any natural or legal person which directly or indirectly controls, is controlled by or is under common control with such party. For purposes of this definition, the term control shall mean the ownership of more than fifty percent (50%) of the voting rights of a person. Article 2 – Disclosure and Confidentiality Arrangements 2.1 Disclosing Party may disclose so much of its Confidential Information to the Receiving Party as the Disclosing Party deems appropriate in the circumstances but Disclosing Party is, remains and will be exclusively entitled to and owner of any and all Confidential Information, and no right or license is or will be deemed to be or have been granted to Receiving Party on account of such disclosure. Such disclosure will always be subject to Receiving Party being the enduser to Disclosing Party for the above Project. 2.2 In consideration of any Confidential Information received, learned, acquired, derived or prepared pursuant to this Agreement, Receiving Party undertakes: (a) to treat the Confidential Information as strictly confidential, not to divulge to any third party (including but not limited to Affiliates) or sell, trade, publish, reproduce or reverse engineer any of the Confidential Information and, to use any Confidential Information only for the Purpose and not for any other purpose in any manner, without Disclosing Party’s prior written consent; (b) not to make known or cause to be made known to any third party, including but not limited to Affiliates, affiliated parties nor to any company or organization, any knowledge of or on Project or the agreements in connection with the Purpose unless such knowledge previously was or became “of public record”, without any reason attributable to Receiving Party; (c) not to make or have made any analysis or any observation of the physical or structural characteristics and/or chemical composition of any Confidential Information provided in material form, directly or indirectly (other than those physical analyses reasonably necessary for the Purpose); (d) not to use any Confidential Information for any other purpose than the Purpose, and not to file any patent application or other similar protection for inventions solely or partly based on Confidential Information. 2.3 The obligations and restrictions set forth in Article 2 paragraph 2.2 of this Agreement shall not apply to Confidential Information of which: (a) Receiving Party can prove by documentary evidence to have been in its lawful and free possession or in the public domain prior to the Disclosing Party’s first direct or indirect disclosure thereof to the Receiving Party; (b) Receiving Party can prove by documentary evidence to have become, after its disclosure to it, part of the public domain by publication or otherwise through no reason attributable to Receiving Party; (c) Receiving Party can prove by documentary evidence to have received from a third party who did not acquire it directly or indirectly from the Disclosing Party and who was entitled to disclose same to the Receiving Party without restrictions. Specific Confidential Information shall not be deemed to be within any of these exclusions merely because it is embraced by more general published or available information. In addition, any combination of features shall not be deemed to be within the exclusions merely because individual features are within the exclusions, but only if the combination itself and its principle of operation are within the exclusions. 2.4 In addition to the above obligations, and without prejudice to the other obligations of Receiving Party, Receiving Party shall, in the handling and storage of the Confidential Information, employ controls, protections and safeguards at least as stringent as it would employ in the handling and storage of its own proprietary data and information and shall restrict access to the Confidential Information only to such limited number of its employees: (a) who are directly concerned in the Receiving Party’s work for the Project, and (b) whose knowledge of the Confidential Information is essential for such work, and (c) who are under a written obligation of sufficient scope to obligate them to maintain the confidentiality of confidential information of third parties in the Receiving Party’s possession, and (d) who are advised of the obligation undertaken herein by Receiving Party, as well as of the confidentiality of Confidential Information, and that such Confidential Information is Disclosing Party’s property; The Receiving Party so disclosing Confidential Information to its representatives shall ensure compliance by such employees and be liable to the Disclosing Party for the due compliance with said obligations. 2.5 In the event Confidential Information received must be disclosed to authorized government agencies pursuant to an irrevocable court order on the basis of the operation of law, or governmental regulation, Receiving Party undertakes to inform the Disclosing Party forthwith of such obligation in order to allow such Party to seek remedy against such disclosure, or to take other measures at its discretion. In the mean time Receiving Party undertakes to: - advise such governmental agencies of the fact Receiving Party has no rights to Confidential Information, and that all rights vest in Disclosing Party, and, - it is under an obligation of confidentiality and is not allowed to disclose any Confidential Information, and, - take any and all applicable preventive procedures and measures to oppose such requests for and on behalf of Contractor and/or Disclosing Party, and - in case all procedural means are exhausted and Confidential Information has to be disclosed to such governmental agency pursuant to such irrevocable court order to: - disclose only that portion of the Confidential Information as strictly required needed to comply with such court order, and, - disclose the Confidential Information only to such persons as such court order requires, but always subject to appropriate binders of Confidentiality, Non Disclosure and Restrictions to use. Receiving Party and/or Disclosing Party has the right in such case to terminate Receiving Party’s use and application of Confidential Information in accordance herewith, and Receiving Party undertakes to desist and terminate use and application of Confidential Information. Receiving Party shall in such case return all Confidential Information to Disclosing Party. 2.6 Receiving Party further undertakes: (a) in the event Confidential Information becomes part of the public domain, or (b) was in its possession, or (c) is received by it as provided in this Agreement, all in accordance with Article 2 above, not to divulge to any third party that it received such information from Disclosing Party or that Parties are developing or applying such information in their works and/or laboratories. 2.7 All rights to the Confidential Information shall remain vested in the Disclosing Party and the Disclosing Party may demand the return thereof at any time, upon giving written notice to the Receiving Party. Within 30 days of receipt of such notice, the Receiving Party shall return all of the original Confidential Information and shall destroy all copies and reproductions (including in electronic form) in its possession and in the possession of its representatives to whom it was disclosed pursuant to this Agreement. Disclosing Party shall record any Confidential Information provided. 2.8 Neither this Agreement nor any Confidential Information disclosed shall be construed to grant any rights in or licenses to the Confidential Information, to the Receiving Party, nor be construed to grant any such rights. 2.9 Receiving Party shall apply any Confidential Information for its own risk and without any liability for Disclosing Party, including but not limited to its obligations as Subcontractor during basic or further engineering, construction and (putting into) operation of the Project, the distribution and use or application of Confidential Information by Receiving Party and/or any third party having acquired same directly or indirectly from Receiving Party or using it for or on behalf of Receiving Party. 2.10 Receiving Party will indemnify, defend and hold Disclosing Party and its Affiliates harmless from any and all claims and damages in this respect. Article 3 – Miscellaneous 3.1 This Agreement covers all Confidential Information. Confidential Information may only be disclosed to Receiving Party and Receiving Party shall only be permitted to use it for the Purpose, as long it is the enduser for the Project. Immediately upon Receiving Party no longer being the enduser of the Project, Receiving Party shall no longer be entitled to use or apply Confidential Information and return the same to Disclosing Party. 3.2 This Agreement is not assignable or transferable without the prior written consent of the Disclosing Party. For purposes hereof, a change of the direct or indirect ownership or control of Company will require Disclosing Party written consent. 3.3 The Disclosing Party makes no representations or warranties, express or implied, as to the quality, accuracy and completeness of the Confidential Information disclosed hereunder. The Receiving Party accepts all risk of reliance on the Confidential Information. 3.4 This Agreement shall be governed by and interpreted in accordance with the laws of the Netherlands excluding any choice of law rules, which may direct the application of the laws of any other jurisdiction. 3.5 In the event of any dispute arising out of or relating to this Agreement, the parties hereto will attempt to reach an amicable settlement of their differences. Failing such settlement the dispute shall be referred to arbitration and settled by arbitration according to the rules then in effect of the International Chamber of Commerce. Such arbitration shall be held in Rotterdam, The Netherlands and conducted in the English language before one arbitrator appointed in accordance with the said rules. The arbitration will be governed by the substantive law chosen by the parties hereto elsewhere in this Agreement and any award will be final and not subject to appeal. This agreement to arbitrate shall be enforceable in, and judgement upon any award may be entered in any court of any country having appropriate jurisdiction. A dispute shall be deemed to have arisen when either party notifies the other party in writing to that effect. These provisions shall not prevent either party to approach any court or other judicial forum in any country having appropriate jurisdiction to obtain timely injunctive or other relief in cases of urgency. 3.6 This Agreement comprises the entire agreement between the Parties concerning the Subject and no representations, warranties or negotiations between the Parties concerning the Subject shall have any legal effect whatsoever unless contained in this Agreement. 3.7 No amendments, changes or modifications to this Agreement shall be valid except if the same are in writing and signed by a duly authorised representative of each of the Parties. 查看更多 4个回答 . 4人已关注
甲醇合成催化剂介绍及使用寿命? 合成 甲醇 工业的进展很大程度上取决于催化剂的研制成功以及质量的改进。在生产中,很多 工艺 指标和操作条件都由所用催化剂的性质决定。所以催化剂对 甲醇 合成 而言是至关重要的。 甲醇 合成催化剂 目前分为两大类:Zn-Cr催化剂和Cu基催化剂。在1966年以前国外的甲醇合成工厂几乎都使用Zn-Cr催化剂,30MPa高压 工艺 流程。1966年以后以英国ICI公司和德国鲁奇(LURGI)公司先后提出使用铜基催化剂,操作压力为5MPa。目前由于甲醇合成流程的总趋势是由高压向低压、中压发展,而中低压流程所用的催化剂都是铜基催化剂。铜基催化剂的主要特点是活性温度低,对生产甲醇的平衡有利,选择性好,允许在较低的压力下操作。目前铜基催化剂有两大类:Cu-Zn-Al系,Cu-Zn-Cr系,由于Cr对人体有害,故工业上采用Cu-Zn-Al系比Cu-Zn-Cr系更多。 不同型号的Cu-Zn-Al系催化剂中,CuO、ZnO、Al2O3的含量不尽相同,但三种 氧化物 的作用是一致的,纯的氧化铜只具有非常低的活性,而且氧化铜本身会很快地被还原为单质铜,并迅速地结晶出来。氧化锌对甲醇合成的选择性非常好,而且它的催化活性与晶体的大小成反比,晶体较小的氧化锌活性较高。 氧化铝 对氧化铜有非常好的助催化作用。由于CuO-ZnO二元催化剂虽然有很高的活性,但还原后催化剂强度差、易粉化,且对毒物十分敏感,而Al2O3或Cr2O3可以形成催化剂骨架,维持催化剂还原后的强度,所以它们是催化剂中必不可少的部分。 催化剂的使用寿命是指催化剂的使用周期,催化剂使用到后期活性变差,表现在生产上主要是产品产量下降,合成气放空量增加,单位产品物耗增加,影响整个装置的经济性,因此必须进行更换。由于催化剂 价格 很贵,而且装卸催化剂要浪费保贵的生产时间,所以如何延长催化剂的使用寿命,是增加产品产量、降低产品能耗的重要因素。 合成催化剂 的使用管理也是甲醇合成工段的重要工作内容。催化剂的主要管理要点如下: (1)在催化剂的升温还原操作中严格按照催化剂的升温还原曲线进行。严禁超温或出水过快。 (2)在催化剂使用初期,应在低温、低负荷下运行一段时间。 (3) 装置前工序应当尽可能将合成气中的有害物质脱除干净,有害物质(主要是硫、羰基铁/镍)是催化剂使用寿命的重要影响因素。 (4) 严格控制操作温度,防止催化剂的热老化。生产中可以通过控制汽包产汽压力来控制催化剂反应床层的温度,一般可控制产汽压力2.5~2.6MPa(a)。 (5) 在催化剂的使用后期可按照需要适当提高操作温度,为保产量可以提高空速操作。 (6)催化剂装填应当要均匀,防止“架桥”现象,造成催化剂使用不均匀。 (7) 在正常生产时,要尽可能保证生产负荷平稳,系统平稳操作。 (8)停车时,严禁催化剂处于反应气的环境中,否则会造成催化剂活性的急剧下降,要求对催化剂进行氮封保护。 正常情况下, 甲醇合成催化剂 的使用寿命为2-3年。 查看更多 1个回答 . 2人已关注
MTBE是什么物质? MTBE是什么物质?查看更多 5个回答 . 1人已关注
H2作载气,He能出峰吗?柱子是13x? H2作载气,He能出峰吗?柱子是13x现在出了一大峰,请问He能出峰吗?如果不能,用什么柱子可以?谢谢查看更多 6个回答 . 1人已关注
电子产品安全距离及其要求? 电子产品安全距离及其要求.所谓安全距离,就是为保护人在使用电子产品的时候,危险电压带电部分与人不能轻易接 触到,也不能让它来引起危险导致威胁人身安全。 因此必须在一般情况下,安全距离是在产品设计中最重要的部分之一。检查安全距离从设 计阶段开始。结构检查人员会首先检查PCB板上的安全距离(最好拿空的PCB板用透明薄尺 或游标卡尺来测量),之后,就是检查危险电压带电部分与其它部分(如外壳、安全电压 部分等)距离等等。总之,一切关乎与安全的部分都要测量,特别重点会在电源部分。 具体参考各种安全标准: IEC60950\ IEC60065\UL60950\GB8898\GB4943等 以下引自其他文章: 安全距离包括电气间隙(空间距离),爬电距离(沿面距离)和绝缘穿透距离 1、电气间隙:两相邻导体或一个导体与相邻电机壳表面的沿空气测量的最短距离。 2、爬电距离:两相邻导体或一个导体与相邻电机壳表面的沿绝绝缘表面测量的最短距离。 电气间隙的决定: 根据测量的工作电压及绝缘等级,即可决定距离 一次侧线路之电气间隙尺寸要求,见表3及表4 二次侧线路之电气间隙尺寸要求见表5 但通常:一次侧交流部分:保险丝前L―N≥2.5mm,L.N PE(大地)≥2.5mm,保险丝 装置之后可不做要求,但尽可能保持一定距离以避免发生短路损坏电源。 一次侧交流对直流部分≥2.0mm 一次侧直流地对大地≥2.5mm (一次侧浮接地对大地) 一次侧部分对二次侧部分≥4.0mm,跨接于一二次侧之间之元器件 二次侧部分之电隙间隙≥0.5mm即可 二次侧地对大地≥1.0mm即可 附注:决定是否符合要求前,内部零件应先施于10N力,外壳施以30N力,以减少其距离, 使确认为最糟情况下,空间距离仍符合规定。 爬电距离的决定: 根据工作电压及绝缘等级,查表6可决定其爬电距离 但通常:(1)、一次侧交流部分:保险丝前L―N≥2.5mm,L.N 大地≥2.5mm,保险丝 之后可不做要求,但尽量保持一定距离以避免短路损坏电源。 (2)、一次侧交流对直流部分≥2.0mm (3)、一次侧直流地对地≥4.0mm如一次侧地对大地 (4)、一次侧对二次侧≥6.4mm,如光耦、Y电容等元器零件脚间距≤6.4mm要开 槽。 (5)、二次侧部分之间≥0.5mm即可 (6)、二次侧地对大地≥2.0mm以上 (7)、变压器两级间≥8.0mm以上 3、绝缘穿透距离: 应根据工作电压和绝缘应用场合符合下列规定: ――对工作电压不超过50V(71V交流峰值或直流值),无厚度要求; ――附加绝缘最小厚度应为0.4mm; ――当加强绝缘不承受在正常温度下可能会导致该绝缘材料变形或性能降低的任何机械应 力时的,则该加强绝缘的最小厚度应为0.4mm。 如果所提供的绝缘是用在设备保护外壳内,而且在操作人员维护时不会受到磕碰或擦伤, 并且属于如下任一种情况,则上述要求不适用于不论其厚度如何的薄层绝缘材料; ――对附加绝缘,至少使用两层材料,其中的每一层材料能通过对附加绝缘的抗电强度试 验;或者: ――由三层材料构成的附加绝缘,其中任意两层材料的组合都能通过附加绝缘的抗电强度 试验;或者: ――对加强绝缘,至少使用两层材料,其中的每一层材料能通过对加强绝缘的抗电强度试 验;或者: ――由三层绝缘材料构成的加强绝缘,其中任意两层材料的组合都能通过加强绝缘的抗电 强度试验。 4、有关于布线工艺注意点: 如电容等平贴元件,必须平贴,不用点胶 如两导体在施以10N力可使距离缩短,小于安规距离要求时,可点胶固定此零件,保证其电 气间隙。 有的外壳设备内铺PVC胶片时,应注意保证安规距离(注意加工工艺) 零件点胶固定注意不可使PCB板上有胶丝等异物。 在加工零件时,应不引起绝缘破坏。 5、有关于防燃材料要求: 热缩套管 V―1或VTM―2以上;PVC套管 V―1或VTM―2以上 铁氟龙套管 V―1或VTM―2以上;塑胶材质如硅胶片,绝缘胶带V―1或VTM―2以上 PCB板 94V―1以上 6、有关于绝缘等级 (1)、工作绝缘:设备正常工作所需的绝缘 (2)、基本绝缘:对防电击提供基本保护的绝缘 (3)、附加绝缘:除基本绝缘以外另施加的独立绝缘,用以保护在基本绝缘一旦失效 时仍能防止电击 (4)、双重绝缘:由基本绝缘加上附加绝缘构成的绝缘 (5)、加强绝缘:一种单一的绝缘结构,在本标准规定的条件下,其所提供的防电击 的保护等级相当于双重绝缘 各种绝缘的适用情形如下: A、操作绝缘oprational insulation a、介于两不同电压之零件间 b、介于ELV电路(或SELV电路)及接地的导电零件间。 B、基本绝缘 basic insulation a、介于具危险电压零件及接地的导电零件之间; b、介于具危险电压及依赖接地的SELV电路之间; c、介于一次侧的电源导体及接地屏蔽物或主电源变压器的铁心之间; d、做为双重绝缘的一部分。 C、补充绝缘 supplementary insulation a、一般而言,介于可触及的导体零件及在基本绝缘损坏后有可能带有危险电压的零件之间 ,如: Ⅰ、介于把手、旋钮,提柄或类似物的外表及其未接地的轴心之间。 Ⅱ、介于第二类设备的金属外壳与穿过此外壳的电源线外皮之间。 Ⅲ、介于ELV电路及未接地的金属外壳之间。 b、做为双重绝缘的一部分 D、双重绝缘 Double insulation Reinforced insulation 一般而言,介于一次侧电路及 a、可触及的未接地导电零件之间,或 b、浮接(floating)的SELV的电路之间或 c、TNV电路之间 双重绝缘=基本绝缘+补充绝缘 注:ELV线路:特低电压电路 在正常工作条件下,在导体之间或任一导体之间的交流峰值不超过42.4V或直流值不超过6 0V的二次电路。 SELV电路:安全特低电压电路。 作了适当的设计和保护的二次电路,使得在正常条件下或单一故障条件下,任意两个可触 及的零部件之间,以及任意的可触及零部件和设备的保护接地端子(仅对I类设备)之间的 电压,均不会超过安全值。 TNV:通讯网络电压电路 在正常工作条件下,携带通信信号的电路。查看更多 0个回答 . 2人已关注
精馏塔中气相量哪个部位最多? 精馏塔 中气相量哪个部位最多?是 再沸器 返塔口还是塔顶?查看更多 13个回答 . 1人已关注
请教关于塔吊耳的问题? 一整体(无设备法兰) 填料塔 ,为二氧化碳 吸收塔 。设计压力0.01MPa,塔总高18500,直径DN2800,壳体厚度分为3段,0~4000为第一段10mm,3960~15390为第二段8mm,15360~18500为第三段6mm。4245~13245为填料段,填料为 聚乙烯 。第三段由直边段和锥体段组焊,直边段长度1000,锥体段长度2140,锥顶角60度。为避免运输过程中设备变形,塔体设置加强圈。 第一次设计塔,请教吊耳应如何设置才能在吊装时塔不会变形? 谢谢.查看更多 6个回答 . 1人已关注
宁波福基石化丙烷综合利用项目? 宁波福基项目从去年4月份动工到现在已经1年了, (1)有没有哪位盖德知道该项目现在进展到什么阶段了? (2)为什么宁波福基的固定电话一直无人接听? (3)该项目PP 挤出机 厂商确定为WP了吗? (4)有没有哪位盖德有该项目相关的联系人及联系方式? 不甚感激,还希望各位盖德多多帮忙! 谢谢!!!查看更多 2个回答 . 5人已关注
什么是大吹汽,小吹汽? 经常听到焦化的人说大小吹汽 什么是大吹,什么又是小吹 吹的应该是蒸汽吧,吹得什么设备,什么时候吹? 两种方式对蒸汽有要求吗? 很想知道查看更多 7个回答 . 1人已关注
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变换的热副线是从什么位置引出的?到什么位置的? 变换的热副线是从什么位置引出的?到什么位置的?采用热副线调节变换炉的温度较冷副线有什么好处?查看更多 5个回答 . 5人已关注
蒽油加氢和催化重整的区别? 产出的石脑油是不是去重整了查看更多 0个回答 . 5人已关注
简介
职业:江苏明化合晟生物科技有限公司 - 售后技术工程师
学校:广东财经职业学院 - 文化应用与传播系
地区:云南省
个人简介:你要知道科学方法的实质,不要去听一个科学家对你说些什么,而要仔细看他在做什么。查看更多
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