The document summarizes the thermodynamic design of a fire-tube steam boiler. Key aspects of the design include calculations of temperature distributions, heat transfer within the boiler, sizing the boiler based on a given mass flow rate, and determining volume ratios and the number of tubes needed. The design outcome specifies dimensions of the boiler such as a length of 5m and diameter of 2m. Tables in an Excel file show additional design parameters and calculations.
Design With Solid works Software and Planning Calculation Analysis of Fire Tu...IJRES Journal
Steam boilers (boilers) is a closed vessel made of steel that is used to generate steam. In the modern era many industries such as household scale industries for the manufacture of oyster mushroom spawn to use aid as a supplier of steam boilers are used as a sterilization process baglog. Annually, the number of requests oyster mushroom spawn have been increases, so the boiler is very significant equipment to increase the number of baglog production as oyster mushroom growing media.To help to fulfill the small industryrequiremets for oyster mushroom nursery,plannedatype offire tubeboilerthatcanhelpthe availability ofsteam ina lowscalewithsteamoutputcapacity of70kg/ h, temperature120℃, pressure1.5barandusingmaterialsLPGfuelas a source ofheatenergy.From the results of this design, fire tube boiler have efficiency of 0.934 % . The kettle body is made from asphalt drums pertamina with the Cold Rolled Steel materials. Used asphalt drums because of its availability in the market more easier to obtained easily and the dimensions of asphalt drum capable of holding for temperature and pressure have been determined . As for the pipe material using Carbon Steel Tubing Boilers ASME SA - 178A GRADE A / SA - 214 (Plain Carbon).
Design With Solid works Software and Planning Calculation Analysis of Fire Tu...IJRES Journal
Steam boilers (boilers) is a closed vessel made of steel that is used to generate steam. In the modern era many industries such as household scale industries for the manufacture of oyster mushroom spawn to use aid as a supplier of steam boilers are used as a sterilization process baglog. Annually, the number of requests oyster mushroom spawn have been increases, so the boiler is very significant equipment to increase the number of baglog production as oyster mushroom growing media.To help to fulfill the small industryrequiremets for oyster mushroom nursery,plannedatype offire tubeboilerthatcanhelpthe availability ofsteam ina lowscalewithsteamoutputcapacity of70kg/ h, temperature120℃, pressure1.5barandusingmaterialsLPGfuelas a source ofheatenergy.From the results of this design, fire tube boiler have efficiency of 0.934 % . The kettle body is made from asphalt drums pertamina with the Cold Rolled Steel materials. Used asphalt drums because of its availability in the market more easier to obtained easily and the dimensions of asphalt drum capable of holding for temperature and pressure have been determined . As for the pipe material using Carbon Steel Tubing Boilers ASME SA - 178A GRADE A / SA - 214 (Plain Carbon).
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Presentation of Refrigeration SimulationShafiul Munir
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Water-cooled chiller systems have typically been designed around entering condenser water temperatures of 85°F with a Optimization of Water - Cooled Chiller – Cooling Tower Combinations The warm water leaving the chilled water coils is pumped to the evaporator of the chiller, where the unwanted heat from the building is transferred by the latent heat of vaporization of the refrigerant. The compressor of the chiller then compresses the refrigerant to a higher pressure, adding the heat of compression in the process. The high pressure refrigerant then moves to the economical condenser water flow of 3.0 USGPM/ton and a 10°F denser, where the unwanted heat is rerange. In recent years, there has been considerable debate on the merits of designing around lower condenser water flow rates with a higher range in order to improve system lifecycle costs. However, two other parameters must also be considered in any analysis - approach and design wet bulb. The question to be answered is: What nominal condenser water flow rate and approach is best from a first cost standpoint as well as from a full load energy standpoint at any given wet bulb.
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1. Thermodynamic Design of a Fire-Tube
Steam Boiler
Prepared for:
Professor Kamran Shavezipur
Prepared by:
(Team 16)
John Walter
Austen Kennedy
Muhammad Shuhaimi
December 11th, 2014
3. 3
Introduction:
The body of the boiler is usually the pressure vessel and contains the fluid. The fluid is normally
the water which will circulate for heating purposes and sometimes is converted to steam for
process use. The horizontal fire tube boiler has three passes. The first pass consists of furnace
while both of the second and third passes consist of tubes. While the fire tube boiler operates,
only the second and third passes are considered for the heat transfer process.
The advantages of the fire tube boiler are the cost is inexpensive, easy to clean, compact in size,
easy to replace tubes, and well suited for space heating and industrial process applications. The
disadvantages of the fire tube boiler are not suitable for high pressure applications and it has
limitation for high capacity steam generation.
This is the list of the main components in the fire tube boiler:
o Boiler shell is the outer component in a cylindrical shape that covers the pressure vessel.
o Burner is located in the vertical walls of the furnace and it brings fuel and air into the
furnace at the desired velocities, turbulence and concentration.
o Furnace is the enclosed space where the combustion takes place.
o Drain is the valve connection that removes all the water from the pressure parts.
o Feed Pump supplies water to the boiler
o Safety valve is a spring loaded valve that automatically opens when pressure attains the
valve setting. It is used to prevent excessive pressure from building up in the boiler.
o Steam separator removes the entrained water from steam
o Firebox absorbs radiant heat from the fire.
o Accumulator stores the heat of steam to be used during late period and at lower pressure.
o Insulation is made from a material of low thermal conductivity and is sued to reduce
heat losses.
o Safety shut-off valve is electrically operated to automatically shut off fuel when de-
energized.
o Circulator is used to pass steam or water between upper boiler drum which is usually
located where the heat absorption is low.
o Strainer is a filter that is used to retain solid particles allowing a liquid to get pass.
o Breeching transports the product for the production between parts of the generating unit.
5. 5
Areafor A2 and A3 are solvedforusingQ2 and Q3 valuesandQ/A values:
𝑄2
𝐴2
= 47.4662
𝐾𝑊
𝑚2 =
2692.112
𝐴2
→ 𝐴2 = 𝟓𝟔. 𝟕𝟏𝟔𝟑 𝒎 𝟐
𝑄3
𝐴3
= 18.0743
𝐾𝑊
𝑚2 =
1046.932
𝐴3
→ 𝐴3 = 𝟓𝟕. 𝟗𝟐𝟑𝟖𝟐 𝒎 𝟐
Volume Ratio
Volume valueswere determinedusingthe designthatwascompletedonthe solidworksprogramaswell
as the values thatare displayedinthe designoutcome.
𝑇𝑜𝑡𝑎𝑙 𝑉𝑜𝑙𝑢𝑚𝑒 𝑜𝑓 𝑏𝑜𝑖𝑙𝑒𝑟: 𝜋(1.95)2(5) = 59.7 𝑚3
𝑉𝑜𝑙𝑢𝑚𝑒 𝑜𝑓 𝐹𝑢𝑟𝑛𝑎𝑐𝑒 𝑜𝑢𝑡𝑒𝑟: 𝜋(0.475)2(5) = 3.54 𝑚3
𝑉𝑜𝑙𝑢𝑚𝑒 𝑤ℎ𝑒𝑟𝑒 𝑤𝑎𝑡𝑒𝑟 𝑜𝑟 𝑣𝑎𝑝𝑜𝑟 𝑖𝑠 𝑝𝑟𝑒𝑠𝑒𝑛𝑡: 59.7 − 3.54 = 56.16 𝑚3
The volume of vapor was determined by seeing that roughly 10 percent of the total front area
was empty at the top. This is where the vapor would be present above the water.
𝑉𝑜𝑙𝑢𝑚𝑒 𝑜𝑓 𝑉𝑎𝑝𝑜𝑟 ≈ (0.1)56.16 = 5.616 𝑚3
Tube area and number of tubes
The surface area of the tubeswere calculatedusingthe assumed tube diameter.
𝐴 𝑡𝑢𝑏𝑒 = 2𝜋(.025)(5) + 2𝜋(0.025)2 = 0.789 𝑚2
The numberof tubesforeachpass were foundbydividingA2andA3 by the tube A_tube.
𝑁𝑢𝑚𝑏𝑒𝑟 𝑜𝑓 𝑡𝑢𝑏𝑒𝑠, 𝑃𝑎𝑠𝑠 2 =
𝐴2
𝐴𝑡𝑢𝑏𝑒
=
56.79581
0.789
= 72 𝑡𝑢𝑏𝑒𝑠
𝑁𝑢𝑚𝑏𝑒𝑟 𝑜𝑓 𝑡𝑢𝑏𝑒𝑠, 𝑃𝑎𝑠𝑠 3 =
𝐴3
𝐴𝑡𝑢𝑏𝑒
=
58.00486
0.789
= 74 𝑡𝑢𝑏𝑒𝑠
6. 6
DesignOutcome:
There were many assumed and given values used for the design of the steam boiler system.
Given Values:
- The tube external diameter is 50mm, and its thickness is 3 mm.
-The thickness of furnace plate is 16mm
-The thickness of main shell is 12 mm.
-Tube diameter is 50mm
Values determined by team:
- Boiler length: 5m
- Boiler Diameter: 2m
- Furnace Diameter: 0.8m
7. 7
Excel Data (Also sent in a separate Excel File)
Assumed/Given
mass flowrate (kg/s) 1.39
pressure (Pa) 1000000
boilerlength(m) 5
boilerdiameter(m) 2
tubesdiameter(m) 0.8
h-w 700
h-air 75
k-tube 51
t-tube (m) 0.003
T1 (celsius) 1100
T3 (celsius) 230
T-w(celcius) 180
Calculated/Determined
T2 665 h2 2778.1
T2-air 882.5 h1 88.14
T3-air 447.5
Q-in 3739.044
Q2/A2 47.39983
Q3/A3 18.04905
Q2 2692.112
Q3 1046.932
A2 56.79581
A3 58.00486
Areaof tube 0.789
Numberof tubes:Pass2 72
Numberof tubes:Pass3 74
Total Numberof Tubes 146
8. 8
References
Godil. Junaid. Boiler. Web. 10 Dec 2014. <http://www.nedians.8m.com/boiler.htm>
Firetube or Watertube? What is the difference? P.C.Mc.Kenzie Company. Web. 10 Dec 2014.
http://www.mckenziecorp.com/boiler_tip_8.htm
http://www.energy.kth.se/compedu/webcompedu/ManualCopy/Steam_Boiler_Technology/Heat_
exchangers/thermal_design_of_heat_exchangers.pdf