Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
  • B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
  • B65G53/34—Details
  • B65G53/52—Adaptations of pipes or tubes
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
  • F23C10/00—Fluidised bed combustion apparatus
  • F23C10/16—Fluidised bed combustion apparatus specially adapted for operation at superatmospheric pressures, e.g. by the arrangement of the combustion chamber and its auxiliary systems inside a pressure vessel
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
  • F23J3/00—Removing solid residues from passages or chambers beyond the fire, e.g. from flues by soot blowers
  • F23J3/06—Systems for accumulating residues from different parts of furnace plant

Definitions

• the invention relates to a pneumatic transport system for transferring particulate material from a first pressurized container to a second container which is under a lower pressure, while successively reducing the pressure. It is built up of a number of parallel tubes, arranged in series, which at their ends are joined to transfer chambers for the gas/material flow from an upstream tube to a downstream tube. Transport systems of this kind may advantageously be used for discharging dust (ashes) from gas cleaners in a PFBC power plant or bed material from a combustor in such a plant.
• PFBC are the initial letters of the English expression Pressurized Fluidized Bed (Combustion.
• a transport device of the above kind for successive reduc ⁇ tion of the pressure by repeatedly changing a gas/particle stream is disclosed in European Patent 0 108 505 applied to a PFBC power plant.
• a combustor and a cleaner for combustion gases are enclosed within a pressure vessel and surrounded by compressed combustion air.
• the operating pressure in the plant may amount to about 20 bar.
• the material to be fed out from a gas cleaner or a combus ⁇ tor is often abrasive and has a high temperature, up to about 900°C. Since the transport device is able to work continuously and without valves, as in the lock hopper sys ⁇ tem, it is most suitable for feeding out dust/ashes from gas cleaners.
• the object of the invention is to provide a compact trans ⁇ port device of such a design that it becomes an effective cooler.
• the transfer chambers are formed with tubular inlets and outlets with hexagonal flanges for connection to parallel tubes in the transport device.
• the transfer chambers are cast in a heat-resis ⁇ tant and abrasion-resistant alloy and the flanges are joined together at one of the sides so as to obtain a con ⁇ tinuous flange with ten of the two sides of the hexagonal flanges.
• the transport device can be formed, in a simple manner, as an effective cooler.
• the hexagonal shape makes it possible to obtain in a simple manner, at the transition of a horizontal tube layer to the subsequent tube layer, a displacement of the tubes by half a tube pitch and a small vertical distance between two tube layers.
• Figure 1 shows a PFBC power plant in which the invention is utilized as a pressure-reducing discharge device and cooler of ashes separated in a gas cleaner
• Figure 2 shows a diagram of such an ash discharge device and cooler comprising 30 tube parts and 29 transfer cham ⁇ bers connecting the tube parts,
• Figure 3 shows a side view of an ash discharge device/ cooler
• Figure 4 shows a section through this along A-A in Figure 3
• Figure 5 shows a longitudinal section through a transfer chamber according to C-C in Figure 6,
• Figure 6 shows a section through a transfer chamber accor ⁇ ding to B-B in Figure 5
• Figure 7 shows an end view of a transfer chamber accor ⁇ ding to D-D in Figure 5.
• 10 designates a pressure vessel which sur ⁇ rounds a combustor 12 and a gas cleaning plant 14 which is symbolized by a cyclone.
• gas cleaning plant 14 dust from combustion gases are separated from the combus ⁇ tor 12 before being supplied to a gas turbine (not shown) via the conduit 16.
• the gas turbine drives a compressor which, via the conduit 18, feeds the space 20 between the combustor 12, the cleaning plant 14 and the pressure vessel 10 with compressed combustion air.
• the combustion is per ⁇ formed in a bed 22 of particulate material in the combustor 12.
• Fuel is supplied to the combustor 12 in the lower part of the bed 22 via the conduit 24 and nozzles (not shown).
• the combustor 12 is supplied with compressed air from the space 20 for fluidization of the bed 22 and combustion of supplied fuel via the duct 26 and the bottom 28 with air nozzles 30.
• the combustor 12 includes tubes 32 for cooling of the bed 22 and generation of steam for a steam turbine. Dust separated in the gas cleaner 14 and consisting of ashes and residues of bed material is fed out via the con ⁇ duit 25 and a pressure-reducing pneumatic discharge device 34, formed as a cooler and placed in the duct 26.
• the device 34 is composed of a number of tubes 36 and transfer chambers 38 connecting an upstream tube 36 to a subsequent downstream tube 36. The dust is forwarded in the conduit 40 to a collecting container 42 with a filter 44 for cleaning the transport gas.
• FIG 2 shows a diagram of a discharge device with 30 parallel tubes 36 connected together by means of 29 trans- fer chambers 38, an inlet tube 46 and an outlet tube 48.
• the conduit 46 is connected to the conduit 25 from .the cleaning plant 14 and the outlet conduit 48 is connected to the conduit 40 in the container 42.
• the numbers 1-30 in the tubes 36 in Figure 2 and Figure 4 denote the ordinal numbers of the tubes 36 forming part of the discharge device 34.
• the tubes 36 and the transfer chambers 38 in the discharge device 34 used as a cooler are arranged in six layers in a frame 50 with the tubes 36 in contiguous layers being displaced in lateral direction by a distance corresponding to half the distance between two tubes 36. In this way the best cooling of a cooling gas stream passing through the discharge device 34 is obtained.
• the transfer chambers are formed with a tubular inlet 52, a space 54, a tubular outlet 56 and a flange 58.
• the flange 58 is composed of two parts 58a and 58b of hexagonal shape joined to each other at one of the sides.
• the transfer chambers 38 are manufactured by casting of a wear-resistant alloy.
• the tubes 36 are provided at their ends with flanges 60, suita ⁇ bly also of hexagonal shape.
• the tubes 46 and 48 are provided with suitably hexagonal flanges 62 and 64, res ⁇ pectively, for connection to the first and last tubes, 36 (1) and 36 (30), respectively.
• the tubes 36 and the transfer chambers 38 are joined together by means of these flanges 58, 60 and bolted joints.
• the shape of the flanges with two hexagonal parts is exceedingly advantageous.
• the tubes 36 and the transfer chambers 38 may be placed in a simple manner in several layers with a small distance between the layers of the tubes 36.
• the flanges of an upper layer rest on the flanges of an underlying layer.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Fluidized-Bed Combustion And Resonant Combustion (AREA)
• Air Transport Of Granular Materials (AREA)
• Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
• Gasification And Melting Of Waste (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=20374758

Family Applications (1)

Country Status (6)

Family Cites Families (4)

• 1989
  • 1989-01-16 SE SE8900133A patent/SE462797B/sv not_active IP Right Cessation
• 1990
  • 1990-01-12 CA CA 2047172 patent/CA2047172A1/en not_active Abandoned
  • 1990-01-12 WO PCT/SE1990/000023 patent/WO1990008084A1/en not_active Ceased
  • 1990-01-12 JP JP2502203A patent/JPH04502746A/ja active Pending
  • 1990-01-12 EP EP19900901927 patent/EP0453479A1/de not_active Withdrawn
• 1991
  • 1991-07-15 FI FI913402A patent/FI97124C/fi not_active IP Right Cessation

Non-Patent Citations (1)

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