Engineering Stack Exchange
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Questions tagged [boilers]

24 questions
11
votes
6 answers

Why isn't heatpump technology used for solar collector panels and boiler tanks?

All solar collector and boiler tank systems that I can find on the market use a liquid to circulate the heat between solar collector panels (or PVT panels) and boiler tanks. Is there a reason why they do not use expandable gas and a compressor…
Louis Somers
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7
votes
2 answers

Questions about making stainless steel boiler

I am currently working on a project (or actually returning to a project) and need to have a heat exchanger boiler made. The hx boiler will be relatively small, a 10" long cylinder around 4" in diameter. One end can be capped, but the other should…
e6r339b
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6
votes
1 answer

Why do boiler exhaust stacks use tapered transitions?

We have a boiler exhaust stack with a base dimension of 120" ID and an overall height of 84'. 21' up, the stack begins a slow transition to 7'6" ID. The transition takes approximately 35' to reach its smallest diameter in the stack. In designing…
Lawrence
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3
votes
1 answer

Is Vapor Compression Distillation inherently more efficient than a thermal-only boiler-condensor?

I'm having a hard time understanding the benefits of VCD (like Slingshot) over a conventional boiler in terms of volume of condensate produced per unit of energy input. I've found quite a few resources explaining (in too much detail for me to fully…
Rhubarb_Tau
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2
votes
1 answer

How efficient would a monotube steam generator without a pump in generating steam pressure?

So, the objective is to generate a water flow similar to a household water system (60 PSI) inside copper pipes that have 30 coil turns that are inside a stove that burns wood. A monotube steam generator is basically a "boiler" without a pressure…
Fulano
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2
votes
0 answers

Yellow/Purple Flue gas in the stack

I was informed today by one of the on-site operators that they saw the colour of the stack flue gas change from colourless to a yellow/purple gas for a short period (~5mins) before returning back to colourless It's a heavy-fuel oil steam boiler…
SimpleJack
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2
votes
1 answer

Placement of supporting boiler in heating circuit

In my thesis, I deal with heating circuits, where several heat generators are present, e.g. a combined heat and power unit and a supporting boiler. Usually, the boiler is placed in front of the heat storage tank, but I have also repeatedly seen…
MerklT
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1
vote
2 answers

In crude oil refinery, does fractional distillation done in one batch or multiple batches?

Does the plant starts by boiling crude oil in low temperature to extract the "lightest" product first, and then subsequently increase it's temperature until achieve the "heaviest"? Or all done in single batch, where it condensed separately? From…
Lorenz
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1
vote
0 answers

Sizing a flash tank

I have to size a vertical flash tank that is located on the blowdown line of a steam generator. General data: Steam generator pressure: 15 bars Blowdown flow rate: 1 t/h of water at 198°C Pressure in the flash tank: 1.1 bar % of flash steam forming…
Snite
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1
vote
2 answers

Are these oscillations normal in a boiler?

I recently helped upgrade an old (±20years) 4ton boiler (heavy fuel oil) with some monitoring instrumentation. I decided to have a look at the data and I'm not sure if these kind of oscillations are normal for an older boiler? I haven't really…
SimpleJack
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1
vote
1 answer

pH calculations for boiler water

For water steam cycle in a "combined cycle power plant" containing 3 boiler drums and dosing of 5% ammonia solution in the condenser. How can I calculate the pH of the boiler water in each of the drums? (LP- 4.6 bar, IP- 36 bar, HP- 162 bar)
Efrat Brayer
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1 answer

Energy consumption of a boiler

I have a question that maybe will be very easy for you. I am working on a district heating model using Dymola, and now I have to incorporate a boiler into my model, such as this one. I was asked to present my results in the form of "energy curve…
Ricardo de Castro
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1
vote
1 answer

How to calculate the start-up cost of a natural gas boiler

How I can calculate or find a value for the start-up cost of a natural gas boiler? The boiler will have a capacity of about 700 kW and is intended for heating the water for a greenhouse.
user5026
1
vote
2 answers

Why is more steam required to turn a steam turbine when electric power consumption is higher

I'm recently under industrial training at a plywood mill. My supervisor is from foreign country so there are some difficulties for me to understand what he is trying to say. In the power plant, the turbine is speed is maintain at 5600 rpm, no matter…
kch5775
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1
vote
3 answers

Rate of flow of steam going from one pressure to another

A closed steam boiler in a coffee machine idles at around 124 °C, the steam and water inside at 1.2 barg. When a steam valve is opened, steam rushes out through a steam wand inserted in milk, to aerate and heat it. What I'm trying to determine is…
jontyc
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