首页
哪里都是你
影响力0.00
经验值0.00
粉丝11
设备维修
滤过洗水含氨? 滤过洗水一般含氨多少?有什么影响 多了 有什么影响 少了又会怎么样??大家说下子查看更多 4个回答 . 1人已关注
SIL 是什么意思,如何做? SIL 是什么意思,如何做? 查看更多 4个回答 . 3人已关注
关于不锈钢焊缝热处理问题? 盖德们: 请问为什么 不锈钢 焊缝一般不进行热处理?谢谢,大家畅所欲言 查看更多 7个回答 . 5人已关注
甲烷化加热器中设计温度怎么选取?用不用考虑甲烷化合成 ...? 甲烷化 加热器 中设计温度怎么选取?用不用考虑甲烷化合成 塔内件 升温 还原的 工况?查看更多 0个回答 . 5人已关注
关于合成汽油一个问题? 我用 甲醇 50%,混合苯30%, 93#汽油 20%混合一起 辛烷 值大概有多少? 哪位知道回答下,或者关于这方面介绍下,谢谢先!查看更多 3个回答 . 4人已关注
加热盘管的水压试验压力是如何计算的?按照容器还是管材 ...? 加热盘管的水压试验压力是如何计算的?按照容器还是管材? 查看更多 20个回答 . 3人已关注
在校学生可以考注册化工工程师么? 我听说注册工程师需要五年的工作经历才能考,可是我又听说我一些同学报名工程师考试了,这是怎么回事啊?查看更多 3个回答 . 1人已关注
注意变频器的外部配备几大要素? 1、当变频器和电动机之间的接线超长时,随着变频器输出电缆的长度增加,其分布电容明显增大,从而造成变频器逆变输出的容性尖峰电流过大引起变频器跳闸保护,因此必须使用 输出电抗器 或滤波器或正弦波滤波器等装置对这种容性尖峰电流进行限制。 2、变频调速的多速电动机,在运行中不能改变极对数。如果在变频调速系统中,为了扩大调速范围而必须选用多速电动机时,由于多速电动机是用改变定子绕组接线方法,改变极对数,实现调速目的。如果在变频器运行中改变电动机的绕组接线,就会引起很大的冲击电流,造成变频器过载跳闸,甚至烧毁的严重事故。所以,要安全切换多速电动机的绕组,必须要等到变频器停止输出后才能进行。 3、变频器的端子“n”为中间直流回路的低电平端,严禁与三相四线制供电线路中的零线或大地相接,否则会造成三相整流桥因电源短路而损坏变频器。 4、在起动、停止频繁的场合,不要用主电路电源的通、断来控制变频器的起动、停止,应使用变频器控制面板上的stop键或sr控制端子。因为变频器启动时,首先要给直流回路的大容量电解电容充电,如果频繁启动变频器势必造成电容充电用限流电阻发热严重,同时也缩短了大容量电解电容的使用寿命。 5、把变频器连接在大容量电源变压器电网中,或者在同一电源变压器上连接有晶闸管变流器而未使用换流电抗器,或者同一电网上有功率改善用切换电容器组时,应配置ac电抗器或dc电抗器,它们也有改善变频器电源侧功率因数和降低输入高次谐波电流的效果。 6、变频器的输出侧一般不能安装电磁接触器,若必须安装,则一定要注意满足以下条件:变频器若正在运行中,严禁切换输出侧的电磁接触器;要切换接触器必须等到变频器停止输出后才可以。因为,如果在变频器正常输出时切换输出侧的接触器,将会在接触器触点断开的瞬间产生很高的过电压而极易损坏变频器中的电力电子器件。因此,要切换变频器输出侧的接触器,必须在变频器的功率管被封锁状态下才可进行。 7、变频器低速运行时的特点及对策。常规设计的自通风异步电动机在额定工况下及规定的环境温度范围内,是不会超过额定温升的,但处于变频调速系统中,情况就有所不同。自通风异步电动机在20hz以下运行时,转子风叶的冷却能力下降,再如果在恒转矩负载条件下长期运行,势必造成电机温升增加,使调速系统的特性变坏。所以,当自通风异步电动机在低频运行并且拖动恒转矩负载时,必须采取强制冷却措施,改善电机的散热能力,保证变频调速系统的稳定性。 8、变频器的漏电流及其对策。由于在变频器的输入、输出布线和电动机绕组中存在分布电容,而现在的变频器大多采用pwm调制方式,因此会有漏电流流过它们,其值正比于分布电容量和变频器的载波频率。因此,要降低变频器的漏电流,一是尽可能缩短变频器和电动机之间的接线长度,二是尽量降低变频器的载波频率。   9、遇有内装制动单元而需外加制动电阻的变频器,一定要注意制动电阻的正确接线。制动电阻要接在p与db之间,不能接在p、n之间,否则会造成变频器的逆变器在未运行时三相整流桥就满载工作,造成变频器无法正常工作,制动电阻也有烧毁的可能。 10、机械制动器在变频调速系统中的正确使用。在脉宽调制的变频器中,其输出频率与输出电压之比为一常数,即v/f=c。在输出频率低时,其输出电压也低,如果机械制动器的电磁抱闸线圈接在u、v、w端,则在变频器低速时机械抱闸始终处于抱紧状态,变频器会因过载而跳闸,所以机械制动器的电磁线圈只能接在变频器的输入端r、s、t端。 11、变频器与供电电源之间应装设带有短路及过载保护的低压断路器、 交流接触器 ,以免变频器发生故障时事故扩大。电控系统的急停控制应使变频器电源侧的交流接触器开断,彻底切断变频器的电源供给,保证设备及人身安全。 12、变频器输入端r、s、t与输出端u、v、w不能接错。变频器的输入端r、s、t是与三相整流桥输入端相连接,而输出端u、v、w是与 三相异步电动机 相连接的逆变电路。若两者接错,轻则不能实现变频调速,电机也不会运转,重则烧毁变频器。 13、不要在变频器输出侧安装电力电容器、浪涌抑制器和无线电噪声滤波器,这将导致变频器故障或电容器和浪涌抑制器的损坏。 查看更多 0个回答 . 2人已关注
煤化工工程行业动态报告:后续投资空间巨大,上调龙头公司 ...? 本文由 盖德化工论坛转载自互联网 中石化加码 煤化工 或至6000亿,成本优势及原料多元化推动下,现代煤化工后续投资空间巨大 据21世纪经济等媒体报道,“中石化将加大煤化工领域投资,未来10年内其投资额将高达6000亿元。这也许是中国煤化工领域迄今为止最大的投资。”在中东石化产能和美国页岩气革命的推动下,以原油为原料的石化工业在成本上是处于劣势。为了应对这种挑战,国内最大的石化产品供应商中石化开始谋划转型,即将业务向以 煤炭 为原料的化工业务拓展。为了统一管理层思想,4月初中石化组织召开关于煤化工的专题讲座,指出大力发展煤化工是集团公司党组从中国国情出发,结合公司实际做出的一项“战略决策”。目前中石化在煤化工领域的投资包括新浙粤煤制气管道和位于内蒙古、宁夏及新疆的三处煤化工项目,未来10年煤化工投资将有望加码至6000亿。我们认为,在成本优势及原料多元化推动下,相关企业投资煤化工非常积极,在煤化工后续中长期投资空间仍然巨大。 煤化工审批三月份以来已然放闸,预计招投标二三季度或开启,订单爆发在即 3月以来现代煤化工审批悄然放闸,已陆续10个项目获批,包括5个煤制天然气、4个煤烯烃和1个煤制油项目。其中值得注意的是,已获审批的并非全部属于“十二五”15个示范项目之列,15示范项目仍有8个待批。这充分证明了我们的观点,即“十二五”煤化工投资并不限于15示范项目,而是示范项目以点带面,实际项目要远远多于15示范项目,预计后续项目仍将继续释放。我们预计煤化工项目招投标二三季度或开启,三四季度或将密集出现,煤化工工程订单爆发在即。 发改委项目审批权限放松,长期利好化学工程及煤化工工程投资 一直被认为是难以撼动的国家发改委投资审批权日前出现松动迹象。根据国务院日前公布的取消和下放117项行政审批项目,属于发改委的投资审批权多达25项。其中涉及到化学工程投资领域的有4项,投资300吨及以上 聚酯 、 乙烯 改扩建和投资PTA\TDA\PX等三类项目取消原发改委审批,投资钾矿肥、磷矿肥项目核准审批权下放到省级部门。化工投资领域发改委项目审批权限被放松或将持续推进,长期利好化学工程及煤化工工程投资。 对比2011年煤化工行情,目前煤化工工程公司估值仍处于低位,强烈推荐中国化学、东华科技及整个煤化工工程板块 对比2011年煤化工行情,目前煤化工工程企业估值,绝对估值及相对估值仍处于低位,强烈推荐中国化学、东华科技及整个煤化工工程板块。目前中国化学股价已接近我们前期目标价位15元,上调目标价至18-20元,对应2013年EPS、20-22倍PE;同时东华科技距我们前期目标价35元仅不到10%,上调目标价至45元,对应2014年EPS、32倍PE。同时,我们建议关注延长化建、三维工程、中化岩土的行业性投资机会。查看更多 0个回答 . 2人已关注
备考注册化工工程师? 本小孩在读研一,明年打算报考,对这方面还一无所知,一般准备多久合适查看更多 2个回答 . 1人已关注
求化学反应式? 请高手解答一下这个反应式的生成物,谢谢!查看更多 3个回答 . 4人已关注
第一年的专业基础和第二年的专业选择题区别在哪里? 如题,请各位过来这给科普一下,第一年的专业基础和第二年的专业选择题,在体量,难易程度,考点分配啥的,有啥区别,我在网上下了很多资料,但是没有明确的区分,不知道是第一年的还是第二年的,担心在一处地方钻得太深,反而贻误了其他科目的复习,多谢多谢。查看更多 7个回答 . 5人已关注
天然气含水量怎么算?? 算天然气的含水量: 我知道一种方法就是必须有天然气成分表 ,可是现在只告诉了我露点为-10℃,谁知道露点和含水量的关系?有公式的给个,不然就讲讲算法,再次表示感谢查看更多 6个回答 . 2人已关注
负压系统,泵的安装高度的问题? 有一罐与 真空泵 相接,罐底放一泵,将罐内高温液体打到塔内,根据安装高度公式,罐上方的压力P。怎么算? 查看更多 2个回答 . 2人已关注
间歇式煤气发生炉下渣箱设计成圆形的方案? 各位大侠:求 间歇式 煤气发生炉 下渣箱设计成圆形的方案。查看更多 2个回答 . 3人已关注
采用臭氧氧化法处理有机废水bod5含量为什么比进水时还高? 采用 臭氧 氧化法处理有机废水bod5含量为什么比进水时还高 查看更多 0个回答 . 5人已关注
净化工段吸收塔? 在低温 甲醇 洗工艺中,若酸性气体 吸收塔 为单塔,其上段主要吸收CO2下段主要吸收H2S,那在具体设计计算中是否可以将其分为上下两段分别计算,都看做单组份吸收过程,也就是说上段对H2S的吸收忽略不计,下段对CO2的吸收忽略不计?查看更多 12个回答 . 3人已关注
螺旋卸料机和螺旋给料机的计算区别? 如题,在计算时, 好像对物料的大小要求都不一样。 查看更多 1个回答 . 2人已关注
氟化工现场问题技术交流? 请一线的朋友找点现场的问题出来,大家讨论一下。奖励丰厚!查看更多 13个回答 . 5人已关注
对2010年的再思考? 对2010年的再思考 Double dipping in 2010 Andy Xie April 11, 2009 At the beginning of 2009, I wrote that the global economy would stabilize in the second half and a bear market rally could start in the second quarter of 2009. I thought that stagflation would be the dominant characteristic for the next few years. I am still sticking to the story. The bear market rally began earlier than I expected. The reason was that major governments have been introducing subsidies for speculation. They believe that the main problems are liquidity and confidence. Hence, if investors or speculators are brought back in the game, the world economy could be back to a virtuous cycle again. I think that this type of approach would lead to a second dip in 2010 Subsidizing risk taking does inflate asset prices, mainly stocks for now. However, the hope that rising stock prices will lead to economic revival will not be fulfilled. We are in the middle of a debt bubble bursting. Rising asset prices lift economy through boosting borrowing for investment and consumption. As the current levels of indebtedness are already too high, we won’t see rising debt demand for consumption or investment. When the dream of a quick economic recovery is dashed, stock prices will slump again, which could expose more problems in the financial system and trigger a second dip in the global economy. The world is amidst a burst after a speculative boom. Boom-burst cycle is quite frequent in history (see ‘Manias, Panics, and Crashes: A History of Financial Crises’ by Charles Kindleburger). A synchronized global one is rare. The last one comparable to the current one was the boom-burst of 1920s and 30s. A synchronized global cycle requires trade and cross-border capital flow to be large. A synchronized global burst is difficult to overcome, because devaluation and export promotion no longer work. If one country has a burst, it can devalue, boost exports, and make money from foreigners to reflate its financial system. East Asia came back this way from its banking crisis ten years ago. Policymakers are frustrated that their stimuli are not working so far. The US government and the Federal Reserve have spent or committed $12 trillion to bail out its financial system. Its budgeted fiscal deficit for 2009 is $1.75 trillion (12% 0f GDP) but will probably surpass $2 trillion. ECB, Bank of England, and Bank of Japan have all cut interest rates to historical lows. Their governments are already running high fiscal deficits. But, employment, business confidence, and consumer confidence continue to deteriorate around the world. Major economies probably suffered similar contraction in the first quarter of 2009 as in the last quarter of 2008. For the whole year of 2009, euro zone, the UK, and the US may contract by 4-5%. Germany and Japan could contract by 7-8%. This sort of global economic collapse is unprecedented. Moreover, it is difficult to see how the world would grow again when the collapse is over. If history is guidance, political crisis tends to follow such an economic collapse. When an economic crisis triggers a political one, it makes a quick economic recovery virtually impossible. Out of desperation, governments are trying to support asset prices either directly or incentivizing reluctant speculators to play. Without understanding what governments are doing, most people think that things are either getting better or well soon. After all, shouldn’t stock prices tell us about the future, according to theory (Unfortunately not true in practice when you really need it)? The positive thinking is leading many to chase this market. This is a bear rally that will swallow many smart investors. This phase of government policy-targeting asset prices began with the Fed’s announcement for buying up to $1.15 trillion of treasuries, commercial and mortgage papers. It was targeting mortgage interest rate in order to stabilize property price. However, this sort of policy meant that the Fed knew what property price should be. The US property price was 100% overvalued relative to income. After the bubble burst, it should go back. What the Fed is doing is to slow the adjustment and shift a big chunk of the adjustment through general inflation rather than property price decline. What the Fed is doing will impact the dollar for years to come. The second part came with the Geithner plan for stripping toxic assets from the US’s troubled banks. Hank Paulson, Tim Geithner’s predecessor, wanted to focus on stripping the bad assets off the banks too. His plan didn’t fly because the market prices for the bad assets were too low for the banks to survive. Most banks have questionable assets more than twice their equity capital. As these assets are trading at 30 cents on the dollar, if the toxic assets are sold at market price, most banks are bankrupt. This is why Hank Paulson shifted to injecting money directly into the banks first. The hope was that it would stabilize the financial system and the toxic asset prices would rise sufficiently for the banks to survive. This hasn’t happened. The Geithner Plan tries to boost the prices of toxic assets by subsidizing speculation. The centerpiece of the plan was offering government-guaranteed 6-1 leverage. If an investor risks one dollar, the plan caps his loss at one 1 but offers the reward equivalent to risking 7. The current toxic asset price is 30 cents on the dollar. The price reflects the expected return on the bad asset. It is equivalent to 70% chance of bankruptcy and total wipeout for creditors and 30% chance of survival for the borrowers that support the assets. Under the Geithner Plan, an investor that puts down one dollar can buy $7 worth of toxic assets. At the current price of 30 cents on the dollar, he could buy $23.3 of toxic assets. There is 30% chance that the investor gets $23.3 and, after paying off $6 of debt, and has $16.3 in income. There is 70% that he loses everything. Hence, his expected income for his $1 investment is $16.3*0.3=$4.9. This plan should have boosted demand for toxic assets tremendously. Indeed, based on the simple example above, investors should be willing to pay more than twice the current price. This would save the banks. For the investors in toxic assets, they reap rewards from the 30% of the performing asset bundles that they have bought and leave the 70% non performing ones to the taxpayers. This ‘beautiful plan’ works by robbing taxpayers. But, the prices for toxic assets have not risen that much. Why? I think that the market doesn’t think that the plan could work. The public opinions may torpedo it before it goes into implementation. If it goes ahead, the US Congress may pass retroactive laws to confiscate the profits from the investors who participate in this scheme. Essentially, the Geithner Plan is giving speculators free money. But they are not taking it because they are terrified of the consequences. The third piece is changing the mark-to-market rule. The Financial Accounting Standards Board of the US has changed its rule for accounting asset value. It now allows financial institutions to value their assets according to their ‘judgment’ rather than market price if they think that the market isn’t working. Market may not value asset prices perfectly. But, who could do better? This rule change is to allow the banks in trouble to stop reporting losses from asset quality deterioration. When this change happened, the share prices of the troubled banks rose sharply. The market was not just reacting to a superficial change. The change is meaningful for the share prices. If the banks can name their prices for the assets on their books, they don’t have to raise capital to stay in business. This means that they might make enough money over time to recapitalize. Hence, the risk of their bankruptcy has declined. The increased survival chance has boosted their share prices. Shouldn’t this be a good thing that banks don’t go burst? Not necessarily so. Look at what happened in Japan. Its banks essentially didn’t report their losses and tried to make money to recapitalize. It kept the economy down for ten years without succeeding in their getting out of capital shortfall. The reality won’t change with a change in the accounting rule. These banks know they don’t have enough capital. Hence, they won’t increase lending and will try to milk their existing assets for profits to recapitalize. They will be a drag on the economy for years to come. The US seems to be copying from Japan. In addition to the US’s policies for targeting asset prices, most other major economies are encouraging their banks to lend. What does ‘encouraging’ mean? Banks normally lend to maximize profits by balancing between risk and reward. When governments encourage them to lend, it really means pressuring banks to lower standards, i.e., taking on more risk for the same or less reward. This sort of policy is really to exchange non-performing loans in future for boosting demand today. The argument in favor such an approach is that, if every bank lends, the economy improves, which would decrease non-performing assets. This sort of ‘free lunch’ thinking works temporarily by inflating another bubble. Of course, it will create a bigger mess in future. Reflating an asset bubble to support the economy is widely hoped for by distressed investors around the world. Policymakers, in addition to their concerns for economic weakness and political stability, are responding to investors’ cry for help. This is why we are seeing so many policies that are pumping air into a deflating bubble. It seems the air-pumping is working now. But, it won’t last. As governments throw everything at it, more air is going in than coming out. But, government actions can’t put in air on a sustainable basis. The air leakage will last with rising unemployment, falling corporate profits, and collapsing trade. I think that the air leakage will overwhelm government air pumping in 2010. Another major dip in asset prices is likely. Further, I think that inflation will become a problem, which would cause treasuries and other government bonds to drop. Government bonds are the last bubble to burst. Other asset prices will bottom when this bubble deflates. This force will reverse all the air that governments are putting in now. The global economy would have a second dip then. The debate over inflation or deflation has been raging on. The low bond yield suggests that the consensus is for deflation. In September 2006 at the IMF-World Bank annual meeting in Singapore I predicted a financial crisis in 2007, economic crisis in 2008, and stagflation beyond. The last prediction has not happened yet. What governments and central banks are doing have strengthened my conviction that stagflation will haunt the global economy for years to come. Historically, the burst following a speculative boom is deflationary for two reasons. First, a speculative boom is investment biased. Hence, there is overcapacity during the burst, as the demand during the boom was exaggerated. Second, bankruptcies of banks and production businesses drive up unemployment, which decreases demand and pushes more businesses into bankruptcies. This vicious cycle prolongs price decline. The current burst won’t lead to sustained deflation for two reasons. First, the speculation was centered on unproductive assets like property and financial product. Automobile and electronics are two global industries with considerable overcapacity. The automobile industry has had overcapacity for a long time. The problem was covered up by the credit bubble that exaggerated demand, as buyers were incentivized to change cars more frequently with zero down-and-zero interest rate financing. The deflationary pressure would end with the bankruptcy of one or two major producers. The deflation would last if governments prop up their auto companies with taxpayers’ money. At least the Obama government has shown unwillingness to do so. The electronics industry is used to deflation. It is usually good deflation-rising productivity supporting declining price from that industry. What’s going on now is not good deflation. The drastic cuts of capital expenditure by global companies have caused a demand collapse for IT products. The pressure is causing the industry to cut back quickly. This industry is shrinking without government prodding. The bad deflation in this industry will end quickly with capacity reduction. China’s manufacturing expansion is also a source of overcapacity. When the Asian Financial Crisis depressed demand one decade ago, I thought China’s overcapacity was deflationary, because manufacturers in other countries would have match Chinese prices. Now is different. Manufacturing prices are Chinese. Manufacturing value added has shrunk dramatically relative to the costs of raw materials. The manufacturing capacity in China is unlikely to sustain deflation. For example, three quarters of the cost for steel production are raw materials like iron ore and coking coal. The overcapacity in steel production can’t sustain price decline of steel product. Second, the vicious cycle between bankruptcy, especially banks, and demand contraction is unlikely now. Governments and central banks are propping up virtually every bank in the world. They are lending to industries to keep them afloat. The current dynamic suggests that a bottom for the global economy would be reached soon. As mentioned above, I thought it would be the first half of 2009. Now, with a second a second dip forecast, it would be likely in 2010. Despite demand weakness, inflation could emerge through commodity inflation and labor unions pushing wage increase, the same factors in the 1970s. Commodity inflation is already visible as investors who are frightened of monetary expansion seek safe haven. Oil is back above $50/barrel despite demand collapse because so much money has flowed into exchange traded funds that buy oil. As central banks keep printing money, more and more money will flow into commodities. I always believe that labor union is mostly demand driven. During prosperity labor unions are weak as a rising tide lifts everyone’s living standard. When hard time hits, more people support union activism. During economic stagnation, especially stagflation, without union power, average workers will see declining living standard. The national strikes in France and other European countries are a harbinger for what could come. I have argued above for a second dip in 2010 and stagflation beyond. I want to add some comments on the nature of bear market rallies. In a structural bear market that lasts for years stock markets can have big bounces from time to time. These bounces can be as big as 40% from bottom to top. Obviously, rallies of such size are mouthwatering. It is difficult for investors to stay on the side line. I am not against playing such bear rallies. But, one must remember that bear rallies are at best zero-sum games and often negative-sum games, i.e., making new lows after each bounce. One’s profit is someone else’s loss. Timing is everything in playing bear bounces. Getting in and out early are the basic principles. The most harmful behavior is chasing. After a rally of 30% has happened, it is very bad for your financial health to chase. The last structural bear market happened in the 1970s and lasted for ten years. It is obviously difficult for investors to stay on the sideline for a decade. After all, how long does one live? This is why a structural bear market swallows more and more people through such rallies. The ones that jump in later tend to be more patient and probably smarter. The last ones that perish in a structural bear market may have IQ over 200. I am afraid that the current bear market won’t end until it brings down Warren Buffett. [ ]查看更多 0个回答 . 5人已关注
简介
职业:福建申远新材料有限公司 - 设备维修
学校:聊城大学 - 化学化工学院
地区:云南省
个人简介:无聊的生活成了我年轻放肆的资本,白天黑夜的扭曲也成了我活动的习性。查看更多
已连续签到天,累积获取个能量值
  • 第1天
  • 第2天
  • 第3天
  • 第4天
  • 第5天
  • 第6天
  • 第7天
 
这是一条消息提示
 
提醒
您好,您当前被封禁天,这天内您将不能登陆盖德问答,离解封时间还有
我已了解
提醒
提问需要5个能量值,您当前能量值为,请完成任务提升能量值
去查看任务