JPS6037362B2 - Waste heat steam generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a steam generation device that generates steam from high-temperature waste gas, and in particular to a steam generation device that utilizes waste heat.

In waste heat boilers, the waste gas conduit and the boiler inlet pipe usually have different cross-sectional areas through which the gas flows, and one pipe must be connected through an enlarged transition chamber.
This transition chamber is made of cast steel to withstand the gas pressure, and is lined with refractory material to maintain the permissible metal temperature.

This design has a number of drawbacks, especially at high gas temperatures.
Some of the disadvantages are the need for frequent maintenance of the refractory, the possibility of the refractory becoming dislodged, the steel shell being exposed to hot gases, and the possibility of the refractory cracking. There are other problems, such as hot gas condensing on the casting and causing corrosion. The present invention has been developed with these problems in mind, and it is an object of the present invention to provide a transition chamber and a waste heat boiler device that do not cause problems.

The waste heat steam boiler device according to the invention consists of a waste heat boiler and a transition chamber that connects the boiler and a waste gas conduit and guides the waste gas from the conduit to the boiler.

The walls of this transition chamber are surrounded by an airtight water-cooled tube panel made of finned water tubes, and the cross section of the transition chamber gradually increases and changes from its inlet to its outlet. The transition chamber does not require fireproof walls and therefore does not pose the problems associated with the use of refractories.

Also, the walls of the transition chamber are maintained at a suitable temperature by water cooling and are not overheated.

Further, this transition chamber can also serve as a furnace for the waste heat boiler. That is, if appropriate equipment for a burner is provided on the wall surface, fuel can be combusted within this chamber if additional heating is required beyond the calorific value of the waste gas. The water pipes that make up the walls of the transition chamber include
Water can conveniently be supplied from circulating water in the waste heat boiler, and the generated steam or heated water can be returned to the waste heat boiler.

For example, the water pipes forming the walls of the transition chamber can be connected to the air-water drum of the waste heat boiler. It is desirable that at least some of the water pipes forming the ceiling, walls, and floor of the transition chamber be piped from the ceiling through the side walls and into the floor. Extra water pipes are usually required on each side wall, and these pipes are preferably routed within the transition chamber parallel to the ceiling water pipes and parallel to the floor water pipes. Furthermore, it is desirable that at least some of the water pipes passing through the ceiling and floor be arranged so as to constitute a water pipe grid that traverses the waste gas inlet to the transition chamber, rather than through the side wall surface.

These water pipes perform a rectifying action on the waste gas flow. Hereinafter, the present invention will be described with reference to embodiments of the accompanying drawings.

The waste heat boiler device 20 shown in FIGS. 1 and 2 consists of a waste heat boiler 22 and a transition chamber 24.

This transition chamber connects the end of the waste gas conduit 26 and the boiler 22. The waste heat boiler 22 is quite conventional and has an upper steam drum 28 and a lower steam/water drum 30, although not described in detail. Since the cross-sectional area of the boiler 22 is considerably larger than that of the conduit 26, the ceiling 32 of the transition chamber
, floor 34, and sidewalls 40 all taper from the boiler to the conduit.

The water tubes 29 drawn out from the drum 28 are joined with adjacent tubes by fins, forming part of an airtight finned water tube panel and becoming the ceiling 32 of the transition chamber 24 . This airtight finned water tube panel extends to the left front end of the transition chamber where the waste gas enters, as shown in Figures 1 and 2, and then the water tubes stagger downwards, allowing the waste gas to pass through. A water tube grid 33 is formed. This grate acts as a rectifier. At the bottom of the water tube grate, the water tubes are bent back to form another airtight finned water tube panel that becomes the floor surface 34, and then the water tubes are joined to the lower drum 3. Ru.

The side wall 40 is similarly constructed of an airtight water tube panel made of finned water tubes, and the diameter and pitch of the water tubes are the same as those of the water tubes forming the ceiling and floor.

The side wall water pipes are bent where they meet the ceiling and floor, a portion 42 of which forms the remaining triangular portion of the panel forming the ceiling 32 and floor 34, as shown in FIG. The remaining water pipes 44 on the side wall are pulled out individually and are piped parallel to the ceiling and floor, passing below the water pipes on the ceiling and above the water pipes on the floor. The exact proportion of the water pipes in the side walls forming the ceiling and floor is determined by the angle 8' (FIG. 3), which is determined by the difference in cross-sectional area between the waste gas conduit 26 and the boiler inlet pipe; Its approximate value is given by sino.

For example, in the case of 8=300, there will be every other water pipe on the side wall surface forming the ceiling and floor. In this way, the angle of the transition chamber can be defined on the basis of the relative dimensions of the waste gas conduit and the boiler inlet pipe, and the proportion of the water pipes in the side walls forming the ceiling and floor can be determined. As mentioned above, this intermediate chamber does not require a fireproof wall and is cooled by water pipes.

As can be understood from the diagram, those water-cooled pipes, whose upper end is connected to the steam drum and whose lower end is connected to the air-water drum, always face upward from the air-water drum to the steam drum. This means that Therefore, steam easily flows from the steam-water drum toward the steam drum. In other words, the flow of steam will not be stopped due to such pipes turning horizontally or downwards midway. If it is necessary to burn additional fuel, an auxiliary burner can be installed in one of the side walls and the transition chamber can be connected to the boiler 22.
It can also be used as a furnace.

The words "water" and "steam" used here are
Unless the context otherwise requires, the appropriate meanings of "liquid" and "vaporized substance thereof" should be taken.

In the foregoing disclosure, the freedom to modify, change and substitute is reserved, and in some cases it may be possible to adopt only some of the features of the invention and not others. It is therefore appropriate that the following claims be interpreted broadly and consistent with the spirit and scope of the invention.

[Brief explanation of the drawing]

Figure 1 is a side sectional view of the waste heat boiler equipment, Figure 2 is
3 is a plan sectional view of the waste heat boiler device, and FIG. 3 is a plan sectional view showing the transition chamber of FIG. 2 in detail, 20: waste heat boiler device, 22: waste heat boiler, 24: transition chamber, 26 : Waste gas pipe, 28: Upper steam drum, 29: Water pipe, 30: Lower air/water drum, 32: Ceiling of transition chamber, 33: Water pipe grid, 3
4: Floor surface of the transition chamber, 40: Side wall of the transition chamber, 42: Water pipe extending from the side wall surface and forming the ceiling and floor surface, 44:
A water pipe that extends from the side wall and is placed inside the transition room parallel to the ceiling and floor. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1 a(i) A steam drum located near the top of the boiler, (
ii) a steam drum residing near the bottom of the boiler; (iii) a downcomer connecting the steam drum to the steam drum; and (iv) a riser pipe connecting the steam drum to the steam drum. A waste heat boiler device comprising: (b) a waste gas conduit; and (c) a tapered transition chamber that connects the waste gas conduit and the waste heat boiler, wherein each of the transition chambers is airtight. , a ceiling sloped upwardly from the waste gas conduit, a floor sloped downwardly from the waste gas conduit, and side walls disposed at an angle;
The cross-sectional area of the transition chamber gradually increases from the waste gas conduit towards the waste heat boiler, and the side walls, floor and ceiling are composed of water-cooled pipes rigidly connected to each other, and the cross-sectional area of the transition chamber The sections extend to the front end of the transition chamber to form a water tube lattice through which the waste gas flows, and whose upper ends are connected to the steam drum and whose lower ends are connected to the air-water drum. A waste heat boiler device, characterized in that the water-cooled pipes are always oriented upwards from the air-water drum to the steam drum.