Difficulties and key points in construction control of caustic soda plant
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This post was last edited by sunjl1981 on 2013-1-6 20:16 Everyone, someone said: Some newly built caustic soda plants are not as perfect as imagined, and there are still a lot of problems in design, construction, and startup. It’s time to invest in the project again. The civil construction is in progress. Equipment has begun to arrive and preparations for installation are underway. In order to better control the quality, progress, and costs, there are so many job numbers, and each job number has its own characteristics. Here is my advice from senior experts.: Difficulties and key points in construction control of caustic soda plant! ! ! :handshake :handshake :handshake # , , &
Compared with reconstruction and expansion projects, new installations are much better, and engineering design errors will be much less, but there are still problems of one kind or another, because after all, the design unit has much less practical experience in production. In fact, we can't provide much practical help. The best way is to have an engineer with experience in caustic soda production for each process to make timely design changes during the installation preparation and construction stages. It is crucial to find an experienced installation team. They can provide a lot of good suggestions during the construction process. It is best to use main materials and general construction contractors. This will reduce a lot of your workload. Of course, you must control the main materials purchased.
Sir, if you devote your whole body and mind to it, you will be able to master the caustic soda technology in less than a few months.
Which job number do you think is the most difficult to construct? Evaporate solid alkali? electrolysis? Rectification? Secondary brine? Dechlorination? Chlorine treatment? Or a PVC installation?
Electrolysis and PVC are relatively difficult!
What’s the difficulty! ? Special construction materials? Complex construction techniques? Sophisticated equipment? Trial control is subtle? Do you have high requirements for feeding products? Is there a large amount of construction work? Would love to hear the breakdown!
The installation accuracy of electrolysis is required to be higher, but everything else is the same, especially there are many specific operation requirements after membrane installation. Please refer to the specific requirements of the membrane supplier for details. Disalt and dechlorination piping are more complicated. In short, the project nodes are all important. If the work number is not completed, it will not be started and put into production. The key point from my experience is that owners should focus on involvement.
Does the following arrangement make sense? Test run with hydrogen chloride first and then electrolysis. Test run with secondary salt water, electrolysis and light salt water combined with electrolytic cell first with fake membrane.
I agree with your point of view. First use hydrogen chloride and then electrolysis test run. Secondary salt water, electrolysis, and light salt water combined with electrolytic tank should be added a little before fake membrane test run. The joint test run must be performed before driving.
Supplementary points include the welding of titanium and nickel, the purchase and installation of non-standard parts, if lining materials are used, the purchase and installation of this material, the debugging of the DCS chain system, the initial installation details of the electrolyzer, etc.
In order to prepare for starting, the exhaust gas treatment system should be started normally before the chlorine system can be started normally.
Should the fake film test run be regarded as a joint test run? !
If it is an expansion, how do you arrange the trial network plan?
Please help us take stock of the following: Which parts need attention during construction due to anti-corrosion requirements?
According to actual experience, it is troublesome not to use FRP in some important parts, such as circulating NAOH pipelines and light brine pipelines. Directly put one part in place to avoid dangerous operation and easy short break. In fact, there are many places that need attention, but I can’t name them all. Let's talk about what comes to mind
How to arrange the test sequence of the aggregation device?
Difficulties and key points in the control of caustic soda projects: 1. The construction of civil works has the greatest impact on the progress. Generally, civil works have a certain maintenance period. 2. The procurement and manufacturing of non-standard equipment, especially large equipment in primary salt water. 3. Delivery time of key equipment.
In fact, every position should be paid attention to, because every process must play its role during driving, and any problem in one place may affect the driving of the entire factory. In addition, each manufacturer's situation is different, and the selection of materials for some equipment and pipelines and the handling of some details during the design or construction process may be different, and there is no one-size-fits-all approach.
If the main materials are purchased by the owner, how to control them? Moreover, the purchasing department is independent of the supply and marketing department of the construction project department! ! ! There is no way to control it!
It is very important to find an experienced installation team. They can provide a lot of good suggestions during the construction process. At the same time, communicating with them can quickly improve your own.