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Questions tagged [boilers]

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Consumption modeling of wood in a boiler

I know very little about thermodynamics, and I need it to do my master's dissertation in Operations Research. I don't know if what I did is correct, and if it is, I don't know how to model the amount ...
Josa Ferreira's user avatar
11 votes
6 answers
4k views

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 ...
Louis Somers's user avatar
2 votes
1 answer
358 views

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 ...
Fulano's user avatar
  • 51
0 votes
1 answer
83 views

Predicting the behaviour of a boiler system if we modify temperatures

I am currently studying a boiler without many technical data. Below a short description: Fuel is put inside the boiler furnace. Primary (F1) and secondary air (F2) fans allow fresh air to go through ...
Snite's user avatar
  • 23
0 votes
0 answers
59 views

Recreate mini fractional distillation column for oil refinery

I am planning to recreate fractional distillation column in my warehouse, size not an issue however want to keep it as compact as possible (ideally should not exceed 8 meters high) Where can I find ...
Lorenz's user avatar
  • 19
1 vote
2 answers
57 views

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"? ...
Lorenz's user avatar
  • 19
1 vote
0 answers
197 views

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 ...
Snite's user avatar
  • 23
0 votes
2 answers
87 views

PID or AI or other approaches to this thermal control problem?

I have this boiler controlled manually at the moment, and I am wondering what would be the most proper approach to automate this process. The boiler in this question basically burns fuel (saw dust, ...
Dave's user avatar
  • 101
0 votes
2 answers
63 views

Building a coffee maker - food grade, heat resistant material?

Background I want to build a drip-style coffee maker for fun. My "design" features a sealable cylindrical housing for the water and heating element. Silicon tubes will carry boiling water ...
EssentialAnonymity's user avatar
3 votes
0 answers
54 views

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 ...
SimpleJack's user avatar
1 vote
2 answers
169 views

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 ...
SimpleJack's user avatar
2 votes
1 answer
48 views

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 ...
MerklT's user avatar
  • 197
0 votes
3 answers
1k views

Does kettle shape affect the speed at which water boils?

Consider I have two type of cooking kettles, which the shape is just like a pure tube with the volume is 1000 cc (1 liter) with the radius and the height as below (volume=pi*r^2*h): The first kettle: ...
AirCraft Lover's user avatar
1 vote
1 answer
312 views

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 ...
Efrat Brayer's user avatar
0 votes
2 answers
289 views

Thermal oil in Boiler not reaching desired temperature

The thermal oil Feroline U in Boiler is not gaining the desired temp of 240 Degrees. We have physically measured the temp using digital thermometer at a distance of 20 cm where the boiler temp sensor ...
Jahangir's user avatar
  • 101
0 votes
0 answers
38 views

Ineffective purging of a flame monitor lens

There is a wall-opposed flame monitor detecting coal, oil and gas combustion in the burners, attached to the furnace walls in a coal-fired power plant. I'm looking for suggestions to clear the dust ...
udidosa's user avatar
  • 161
0 votes
1 answer
116 views

Model of a domestic boiler

I have to design a model of a domestic boiler. I represent the boiler as a heat exchanger (HEX1), as shown in the figure. In many articles I have found that it is schematized with this equation: $$ ...
Ugo Mela's user avatar
1 vote
1 answer
307 views

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 ...
Ricardo de Castro's user avatar
0 votes
1 answer
132 views

Can a water pressure switch be used as a low-water cutoff means for a steam boiler?

Steam boilers obviously need to be protected from the catastrophe of running out of water -- you then either get a meltdown if the boiler is fired unwatered for an extended period of time or a boiler ...
ThreePhaseEel's user avatar
1 vote
1 answer
519 views

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.
user avatar
1 vote
2 answers
323 views

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 ...
kch5775's user avatar
  • 11
3 votes
1 answer
343 views

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 ...
Rhubarb_Tau's user avatar
1 vote
3 answers
525 views

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 ...
jontyc's user avatar
  • 111
7 votes
2 answers
1k views

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 ...
e6r339b's user avatar
  • 85
6 votes
1 answer
768 views

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 ...
Lawrence's user avatar