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Hi there, Can anyone please guide on the advantage of having a constant primary and variable secondary pumping system compared to a variable primary only system? Also what happen if I close the valve on the decoupler for a primary-secondary pumping system? Would there be any risks on the...

After some research, we don't think we will recover the condensate but we would put a heat exchanger to recover the heat to heat up our makeup water before going to the deaerator. lilliput1 - you mentioned about temperature limitation on the economizer outlet. How low can the exhaust...

Yes. We have an economizer installed at the stack. and since we have touched the point, may I know what is the typical exhaust gas after the economizer if we are running on natural gas. I have seen the temperature after exhaust reached 90 deg C which I am sceptical because based on the boiler...

So if there is condensate returning to the boiler, say 50% at 80 deg C, and makeup at 30 deg c. my water going in to the boiler would be around 55 deg C. Which would then decrease the fuel consumption and increase steam generation efficiency, right? How about net efficiency: Net efficiency =...

Thanks racookpe1978 but can you explain a bit on what do you mean by useful energy supplied? Lets say Steam is going in the autoclaves at 10 bar and going out as condensate at 120 C. Would the useful energy supplied be: 15ton/hr X (Steam enthalpy @ 10 bar - condensate enthalpy @ 120 C)? But...

Hi there, I'm trying to figure out how can I assess a steam process plant efficiency? not a steam power plant. I try to scourge through the internet and most of my searches are related to a steam plant which is not my objective. So consider steam is produced by a 15 ton/hr boiler at saturated...

It is more on general question and not specific to any brands.

It's a three pass package boiler from Mechmar. I'm not sure if you are familiar with the brand.

Hi there, Is there a graph on how firing rate relates to boiler load? I'm wondering on how does combustion efficiency relates to boiler efficiency. On my perspective, a boiler with a burner turndown of 4:1 (25% lowest firing rate) for example, will have 4 different efficiencies (100% to 25%)...

Hi there, Can anyone explain or is there a graph on how firing rate relates to boiler load? I'm wondering on how does combustion efficiency relates to boiler efficiency. On my perspective, a boiler with a burner turndown of 4:1 (25% lowest firing rate) will have 4 different efficiencies (100%...

Thanks for the reply. I definitely need to have the technical manual looking at the reponse here.

Hi there, Steam is flowing through a pipe DN 100 from 5 barg and released it through the atmosphere. I'm thinking of how can I calculate the steam flow or velocity in the pipes. I've been looking through the internet and found two different formulas and I believe these implies to incompressible...

When upstream pressure increases, does the flow through a letdown valve increase as well due to the higher pressure drop? Introducing a pressure regulating device would give an advantage of controlling the flow if there is upstream pressure fluctuations right?

The current situation is that valves are manually throttled from 11 barg down to 9 barg. And because it was done manually depending on the operator it is usually above than 9 barg, exanple 9.6 barg. I'm thinking of installing a prv on the line to improve the control of th system Would it save...

Hi there, I'm wondering if there is any energy loss when steam flows through a let down valve. Example: Boiler is producing steam at 11 barg. Pressure drop to the end user is around 1 barg. End user only needs 9 barg so a valve was throttled to reach the pressure. Is there any energy loss...

We are using portable flue gas analyzer to log data for 7 days.

Hi, Does anyone have experience on installing portable flue gas analyzer? Can we do it while the boiler is running? The stack temperature is around 250C to 300C. Thanks

Hi there, Can anyone help to clarify the boiler efficiency calculation particularly on the output part? Control Volume is only on the boiler Example: Assuming that there is no blowdown, Mass balance: Mass of feedwater = mass of steam Energy Balance: Mass of feedwater X Feedwater enthalpy =...

I'm performing an energy audit on a boiler. Part of the audit is to identify the current combustion efficiency and how can it be improve.

Hi there, I'm trying to find combustion efficiency table for medium fuel oil 180cSt. Does anyone know where can I look at? Can I consider the particular fuel to be No 6 fuel oil as it is more common? Regards