Forum Posts

Wesley
May 15, 2022
In Milling
Dear fellow PalmIngineers, our mill has TNB supply to our process main switchboard for the start up and standby power source. I was asked by my Chargeman what if the Turbine tripped and TNB supply happens to be unavailable? What shall the Boilerman do in this situation? Shall we purchase a standby genset as an additional standby source? When asked, has this situation ever happened over the last 8 years of our mill processing, he said it has never happened before. I am looking forward to your valuable experience for us to make a decision. Thank you guys.
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Wesley
May 05, 2022
In Milling
Our mill is one of those few which are doing Land Application for the final discharge of the treated POME. Over the years, struvite has scaled the pipings all the way from our pump discharge to the furrow sites. The pump Head has gone up and our pump rate has dropped tremendously. I have Googled for methods to descale these pipes but to no avail. Now looking forward to our dear members to advise and share their experiences in helping me to solve my problem. Thank you for your kind sharing.
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Wesley
Feb 08, 2022
In Milling
Recently due to black smoke problem our mill was compelled to operate at 60~70% loading. Our boiler is installed with superheater. I am concerned and have doubts if there will be any undesirable consequences to the Superheater? Will the Superheater gets overheated and bend? Will it affect the Steam and Power Balance of the mill? Members’ comments and supports would be highly appreciated.
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Wesley
Dec 14, 2021
In Milling
After failure to comply with the Clean Air Act of our Water Scrubber, our mill was advised by DOE to replace it with a 2 fields ESP. But I was made aware that some mills installed with single field ESP could meet and comply with the Act. So, I am rather confused about the present status of DOE’s stand on the new installation of ESP. My questions are: Is it true that DOE requires all new ESP to be 2 fields? If so, why? What are the criteria for selection of 1 field or 2 fields ESP for a mill? Some mills share a common ESP for multiple boilers. Will DOE approve that configuration? What if this ESP broke down, both boilers also cannot operate. Since some mills installed with single field ESP had proven that it works, why DOE or mills are going for the 2 fields ESP? I understand ESP is NOT all almighty. What are the operating factors/conditions that could possibly or likely affect or result in non-performance or non-compliance? The importance and sensitivity of Steam/Power/Fuel Balance of a mill has quite often been neglected. How will this affect the satisfactory performance of ESP?
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Wesley
Nov 15, 2021
In Milling
I noticed that whenever there is a delay in charging of any sterrilizer, and the start of a new sterilization cycle, the safety valves on the BPR starts to blow-off. The blow-off continues until the new Sterilizer Cycle starts with the opening and regulation of the Inlet Valve on the Sterilizer. In some instances, I noticed the Engine Driver has to open the By-Pass Exhaust Valve to prevent built-up of steam pressure (more than 45 psig) in the BPR that will cause the steam turbine cycle to drop. My questions are: 1. Is this normal in palm oil mills? 2. Why the continuous discharge from the safety Valves and no drop in pressure in the BPR? I noticed when the Safety Valves on the boilers blow, the pressure in the boiler drops quickly and the safety valves close immediately after. 3. How can I prevent the accumulation of pressure in the BPR automatically without intervention by the Engine Driver?
Is the excessive steam blowing out from the Safety Valves of the Back Pressure Receiver (BPR) normal content media
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Wesley
Oct 22, 2021
In Milling
I refer to Mr. Wee‘s excellent Case Study Paper on Steam & Power Balance. After downloaded the paper and studying in detail for 1 weeks, I found the paper so intriguing that it compels me to ask questions and want to understand this subject thoroughly. First of all, as a Mill Engineer for a while, I have heard of Steam & Power Balance of a Palm oil mill now and then but I could not really comprehend it more so, how is it represented in the mill. None of my Sifu Engineers has ever explained and guided me about it. So, my question is: 1. how do I know if the Steam & Power is balanced in my mill? 2. How do I go about correcting it? Thank you in advance. Hope other members would join in and take keen interest in this important and pertinent subject in all Palm oil mill Engineer’s career.
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Wesley
Sep 15, 2021
In Milling
Our mill throughput is 45MT/Hr FFB. The effluent from oil room goes to a concrete sludge pit with a RT of 3-4 hrs and without a oil skimmer. The overflow is then pumped through a Centrifugal pump to a Vertical Clarifier with 4 hrs RT acting as Oil Recovery Tank before been discharged to the POME cooling pond. The oil recovery tank has a stirrer and 100 mm of top layer is skimmed to recycle back to the oil room. I am doubtful of this design as we have heaps of sludge oil found in our cooling ponds year round. Please advise...
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Wesley

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