Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F22—STEAM GENERATION
  • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
  • F22B11/00—Steam boilers of combined fire-tube type and water-tube type, i.e. steam boilers of fire-tube type having auxiliary water tubes
  • F22B11/04—Steam boilers of combined fire-tube type and water-tube type, i.e. steam boilers of fire-tube type having auxiliary water tubes the fire tubes being in horizontal arrangement

Definitions

• the present invention relates to a steam boiler comprising a flue positioned centrally in the bottom area of the boiler, said flue having a burner unit and a number of fire tubes with matched turn chambers and a smoke box, possibly comprising an economizer, of which all are surrounded by water chambers and a boiler shell having a discharge nozzle for steam.
• Such boilers are used for the production of steam for many different purposes, both low-pressure steam mainly for heating purposes and high-pressure steam, which can be used for various power supply purposes and for heating purposes.
• steam boilers are usually provided with more uptakes, i.e. the smoke and the hot gasses pass more heat exchanger surfaces surrounded by water chambers, so that the main part of the thermal energy is passed to the water to be converted into steam.
• the smoke is hereafter led through a so-called economizer before it is led to the chimney, for instance by means of a flue gas blower.
• the smoke is further cooled and the collected heat is used for the preheating of prime water for the boiler, preheating of the fuel and/or the air, which is blown in for use by the combustion, in that hereby the efficiency of the boiler is increased.
• the object of the invention is to provide a steam boiler where the configuration of the fire tubes and the smoke boxes has been particularly considered in order to achieve a compact boiler with a very high efficiency, while at the same time the fire tubes are easily cleaned.
• the two uptakes are led through two sets of fire tubes in a compact manner, in that the flue gas is first led from the flue to two fire tubes, which carry the flue gas forwards towards the front of the boiler, and from here the flue gas is led back to the rearmost smoke box of the boiler through a number of fire tubes and leaves the boiler.
• This particular configuration permits complete cleaning of all fire tubes, the flue and the frontmost turn chambers from the front end of the boiler, for instance through suitable caps which can be opened, through which cleaning means can be introduced.
• the fire tubes in the second uptake can be cleaned by arranging automatic tube cleaning means on the rear- most smoke box of the boiler.
• another medium can be heated in tube coils in the fire tubes of the boiler, which medium can also be saturated steam from the boiler which should be superheated in order to obtain dry superheated steam.
• This particu ⁇ lar configuration provides a simple replacement pro ⁇ cedure when repairing or replacing a tube coil, and especially if the boiler according to the invention is configured as presented and characterized in claim 4, the tube coil can be replaced particularly quickly as a joint unit which is removed through the front of the boiler. Replacement of the superheater tube thus only brings the boiler to a very short standstill.
• the possib ⁇ ility is provided of cleaning the cylindrical fire tubes and any tube coils placed herein while the boiler is operating in full, since the steam or the amount of water which is blown in through the clean ⁇ ing nozzle will pass the boiler surfaces downstream, first through the large cylindrical fire tubes and thereafter through the smaller fire tubes for the second uptake and tear off any soot. The main part of the soot will collect in the turn chambers where it can be removed through cleaning caps.
• the steam boiler according to the invention is pref ⁇ erably configured to be used in the production of superheated steam as presented in claim 6, in that a very dependable and compact boiler is achieved, which is easily maintained both in respect of the cleaning of the boiler and the replacement of superheater tube coils.
• Fig. 1 shows a boiler as a whole axonometric and partly sectionalized
• Fig. 2 shows a horisontal section II-II in Fig. 1 in the first uptake
• Fig. 3 shows a section 111-III in Fig. 2 in the tube coil.
• 1 refers to a boiler shell surrounding a steam boiler with a flue 2' comprising a cap 2 for a burner and a supply nozzle for fuel at the front of the boiler.
• the flue 2' opens into the rearmost smoke turn chamber 3, and the flue gas is again led forwards towards the front of the boiler through two cylindrical fire tubes 4, one at each side of the flue 2', said fire tubes constituting the first uptake.
• the fire tubes 4 open into each their smoke turn chamber 5 at the front of the boiler, and the flue gas is hereafter in the second uptake led through a large number of fire tubes 6 having a substantially smaller width in the clear than the first-mentioned fire tubes 4. From the many fire tubes 6 the flue gas is led out into the smoke box 7 and from there to the chimney, possibly through an economizer for the heating of prime water or for the heating of fuel and/or combustion air.
• each fire tube 4 for the first uptake is provided a tube coil 8 ending in pipe nozzles 9 and 10 pro ⁇ truding through a cap or a front plate 11.
• Fig. 3 shows the configuration of the tube coil with the inlet nozzle 9 and the outlet nozzle 10.
• the tube coil 8, which is preferably designed for use by the superheating of saturated steam, can be pulled out of the fire tube 4 as a unit in connection with repair or replacement.
• soot blowing nozzles 12 can be provided, see Fig. 2, in order that steam or water can be added downstream for soot cleaning, partly of the flue 4 and partly of the tube coil 8. The soot blowing is performed while the boiler is in full operation.
• Fig. 2 show the direction of the flue gas through the boiler.
• the boiler is configured in the usual way, i.e. constructed of cast or forged parts being joined and sealed in the usual way and in such a manner that the flue 2' , the turn chambers 3, 5 and the fire tubes 4, 6 are surrounded by water chambers for boiler water to be heated to a desired steam pressure and temperature.

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• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Incineration Of Waste (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=8106085

Family Applications (1)

Country Status (3)

Cited By (2)

Citations (5)

• 1988
  • 1988-03-22 DK DK156288A patent/DK156288A/da not_active IP Right Cessation
• 1989
  • 1989-03-17 WO PCT/DK1989/000060 patent/WO1989009363A1/en unknown
  • 1989-03-17 AU AU33627/89A patent/AU3362789A/en not_active Abandoned

Patent Citations (5)

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