Hello, we intend to construct a small furnace to burn excess syn gas from biomass pyrolysis. I would like to know the optimal position to place the chimney, i.e, should the chimney be placed at the center or at one extreme wall?
Thanks for your various inputs
Hello all, we are shutting down our vacuum distillation unit for a planned turnaround. This is the first time we are shutting down the unit after it was commissioned. I would like to ask from your various experiences which method is more preferable to empty the tower. Can we use the bottom pump...
Dear all, the refinery were I work had a fire incident that completely burn down the crude distillation unit, LPG unit, Light and heavy naphta splitting units. For now, detail inspection has not been done to evaluate the integrity of the main equipements like the distillation columns, lines...
Hello all, I have a demineralisation chain with a production cycle of 300m3 in 12 hours(25m3/hr). The demineralisation unit is made up of a cationic and anionic ion exchangers. We use hydrocloric acid and Sadium hydroxide solutions for regeneration.
Over the past 2 days, we have encountered a...
Hi all, we have just received FEED documents from a new demineralization unit we intend to buy. The demineralization chain is made up of a Carbon filter, Cationic drum, CO2 degasser, Anionic Drum and a mix bed drum to complete the demineralizing process. In the documents, it is stated that, the...
Hello All, I have a caustic soda scrubber (NaOH) to eliminate mercaptanes from butane. It is a batch. The concentration of NaOH at the begining of run is 30%. The solution usually gets spent when the concentration is around 10%. Recently, we discovered that, the NaOH solution gets spent when...
Dear All, Recently a small furnace for the hydrotreatment unit was upgraded. The specific consumption changed from 20kgst/t to 14kgst/t. I would like to evaluate the return of investment from this upgrade. How do we convert kgst/t to kg/t. The combustible is fuel oil. The PCI is 9856 kcal/kg...
Dear All, am working as operations engineer of an atmospheric distillation unit. Recently, the water content of light and heavy gasoil coming out from their respective coalescer drums gave a value of 0.1% for a maximum value of 0.05%. I reduced the stripping ratios of the 02 gas oils by half...
Dear All, I am presently monitoring 2 boilers with a pressure of 17 bars . The pH of the boiler waters has falling to below 10.5. I will like to note that the pH of the make up water is about 9.2, that of the feed water is 9.5. A phosphate agent is added to the feed water on its way to the...
Dear All, I am presently monitoring 2 boilers with a pressure of 17 bars . The pH of the boiler waters has falling to below 10.5. I will like to note that the pH of the make up water is about 9.2, that of the feed water is 9.5. A phosphate agent is added to the feed water on its way to the...
Dear All, I have been running a demineralising chain made up of cationic drum and an anionic drum. During regeneration of these resins, the operators don`t drain the ionic exchangers completely before starting the regeneration. I think that if those ionic exchangers are drained completely from...
Dear All, I would like to know how I can go about calculating the bridgewall temperature of a furnace. ( formula, software etc.) This is for safety measure as regards to daily monitoring of the furnace. Thanks.
Can somebody please help me with the calculation of the efficiency of a water tube boiler of 17 bars. Its production capacity is 35t/h. The guy before me use to calculate the efficiency using the effluent gas temperature and the excess air. I am thinking of using the heat absorbed/heat...
I would like somebody to advise me on the best ways of daily monitoring aircoolers. I am talking about methods which will indicate the fouling of the aircoolers. In the process division where I am working, there is nothing like that. Maintenance on the aircoolers are been carried out base on...
I would like to know what should be done if the resins are accidentally exchanged, i.e placing the cationic resins in the anionic drum and vice versa. Will it still be possible for ion exchange to take place? Will it be possible for regeneration of the resin to occur?
The demineralizing chain is...
The pH of water entering the demineralising chain is 7.02. The pH of this after passing through the cationic drum is 4. The pH of water leaving the anionic drum to the storage tank is 10.4. I would like to know if the pH of this demineralised water is normal to be 10.4. I understand there is...
I am writing my first end of month report as energy analyst in a small refinery. I have calculated the efficiency of the furnace of the hydrotreatment of naphtha using the formular which takes into consideration excess air and the temperature of flue gas leaving the stack. I would like to...
I would like to ask 3 questions.
1 -Is the duty found on the data sheet of a heat exchanger that of the heat released by the hot fluid or that absorbed by the cold fluid or the average of both?
2 - In an attempt to monitor the heat exchangers of the preheating train of a distillation column I...
I would like to know to what extent the pressure difference between atomization steam and fuel in a fuel oil gun can be increase. I discovered recently that, the pressure of fuel oil fluctuates between 6-8 bars. The present pressure difference is 2 bars. I intend to raise it to 2,5 bars. I...
I have just finished with the regeneration of the 5th cycleof our reforming catalyst. We experienced post combustion in the 3rd and 4th reactor for about 4 days when the oxygen concentration was raised to 2%vol.We contacted the patent holders and they advise us to stay at an inlet temperature of...
