CS258697B1 - Large space fluidized bed steam boiler - Google Patents

Abstract

The solution concerns a large-space steam* boiler with fluid coupling, where the solution is to create a space suitable for fluid combustion©. The essence is that the combustion chamber is formed by a front and no disk chamber, between which are welded shaped all-metal gas-tight tubular side walls in the lower part forming two walls of a fluidic* hearth, further bounded by a heavy wall and a fluidic grate. In the space of the fluid focus, immersed in the fluid layer, the tubes of the evaporator are slanted.

Description

258697

The invention relates to a large-capacity steam boiler in which the formation of a space suitable for fluidized combustion is solved. From the hitherto known types of large-scale steam boilers for the combustion of solid and liquid fuels, the execution of cylindrical, flame-retardant, radiotraced, box-type and combined (such as: locomotive, locomotive, Fairbaln, Tischbain, ship, Holander, etc.) Today, the built-in boiler is a combined or pure tubular boiler, usually compacted, easy to transport and easy to assemble. The current large-scale steam boiler is predominantly, by combining a flame-tube and a quartz-tube with a non-heated cylindrical surface. The flame is shifted parallel to the heat pipes and is connected to the flue gas side by a reversing chamber where the temperature of the fuel moves in the range of 950 to 1050 ° C. The boiler is usually built with an upstream cooled grouting space, into which the grate type grates and the transfer are incorporated, such as combustion plants. The advantage of these boilers is that they are only able to burn relatively high-grade coal.

The aforementioned drawbacks are eliminated by a large-scale, fluidized-bed steam boiler, the fact that the combustion chamber is formed by a front and no disk chamber, between which the molded all-metal ply-welded tubular side walls are formed. the portions forming the two walls of the flush focal point - further delimited by the heavy gauge and fluidized grate. In the fluidized-bed space, submerged in the fluidized bed, the concavity of the evaporator pipes extending from and through the orifice to the sidewall pipes.

By using two disc dienes and a support-bonding all-metal gas-tight tubular wall, which in the lower part passes into the fluidized bed, the basic conditions for fluidized combustion of the solid fuels are produced. Another great advantage of such large-volume steam boilers is that it is possible to dispense with the flame retardant at a combustion temperature (about 850 ° C). The space thus released is replaced by heat pipes, whereby the unfavorable ratio of the heating surface to the enclosed space is improved. Choosing three flue gas ducts with two reversing chambers reduces the lead loss and increases the separation, often with 4 abrasive properties, characterized by a sapoplane.

In the accompanying drawings, Fig. 1 shows a schematic diagram of a large-volume steam boiler with fluidized bed and hot tubes. Fig. 2 is a sectional view B-B through the combustion chamber.

The fuel is fed into the boiler by gravity lead 18 directly into the flush furnace 5, below the level of the fluidized bed 8. After burning the fuel by the burner 22 while simultaneously supplying fluidizing air through the air box 13 and the air nozzles 23, the exhaust gas is released. they pass d0 'of the combustion chamber 1 and pass through the flue gas outlet 19 into the cooling chamber 20 with the horizontal guided heat pipes 21. The flue gas is passed through the rear and front chamber 24, 25. The flue gas from the boiler leaves through the flue gas chamber 26. The flue gas flue ash 5 is discharged through the outlet neck 35 and from the reversing chambers 24, 25 through the front and rear hoppers 36, 37. The supply line is fed into the cylinder 27 of the cooling section 20 via a supply throat 28. the boiler water is introduced into the irrigation chambers 15, through which the side wall tubes 12 forming part of the suitably shaped all-gas gas-welded walls 4 are discharged. The fluidized bed 8 is partially discharged by the tapered tubes 9 of the evaporator 10 connected by the tubes 12 of the side walls. The front and rear disk chambers 2, 3 forming part of the wall of the combustion chamber 1 are fed by connecting tubes 31. The steam chamber from the disk chambers 3, 3 with the transfer tubes 33 leads to the steam chamber 34 of the cylinder 27. throat 32 into the parojem. The lower part of the fluidized-bed 5 is also partly formed by the walls of the heavy-duty buckle 6 with gas-tight sheet metal 16 and the fluidized grate 7, which are supported by beams 14 suspended on the chambers 15. - in the pressure system of the boiler is transferred, through the 17 located in the front disk chamber 2.

Further, the advantages of the present invention, which have not been mentioned so far, are that the large-scale fluidized bed steam boiler reduces the harmful emissions of sulfur oxides (SOX) and nitrogen (NOX) to a great extent. As a result, this device is particularly useful in areas with particularly stringent environmental criteria, such as new urban development and the like.

Claims (5)

A large-volume fluidized-bed steam boiler comprising a fluidized bed combustion chamber and a cylindrical cooling section with horizontal heat pipes, characterized in that the combustion chamber (1) is formed by a front and no disk chamber (2), (3) between brewed shaped all-metal gas-tight welded tubular side walls (4J in the bottom) of the part forming the two walls of the fluidized bed (5) further delimited by a heavy screen (6) and a fluid bed (7). A large-scale steam boiler according to claim 1, characterized in that in the fluidized bed space (5) immersed in the fluidized bed (8), bundles of tubes (9) of the evaporator (10) extending obliquely into the tubes (12) of the side walls ( 4). 3. A large-scale steam boiler has fallen into position 1 and 2, characterized in that the fluid grate (7) with the air box (13) as well as the heavy gauge (6) are supported on the beams (14) supported by the irrigation chambers (15J). tubes (12 J side walls (4)). 4. A large-scale steam boiler according to claim 1, 2 and 3, characterized in that the heavy liner (6) is surrounded by a gas-tight sheeting (16). 5. A large-capacity steam boiler according to claim 1, 2, 3 and 4, characterized in that holes are provided in the front disk chamber (2) for the hatch (17) and the gravitational downcomer (18) of the fuel and the chamber (3) is an opening (19) for outlet of the flue gas into the cooling section (20) with horizontal heat pipes (21).