JPH0249441Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a steam generator with improved earthquake resistance.

Figures 1 and 2 show a waste heat recovery boiler that recovers heat from gas turbine exhaust (gas), but as shown below, there are concerns about the earthquake resistance of this type of boiler due to its structure, and improvements are needed. desired. Reference numeral 1 denotes a large number of evaporation tubes arranged vertically in the direction of gravity, and headers 15' and 6 are attached to the upper and lower ends of each evaporation tube 1, respectively, and the whole constitutes one heat transfer panel. A plurality of heat transfer panels are arranged in relation to the gas flow. The upper header 15 of this header is connected to the drum 2 via the rising pipe 12.
On the other hand, the lower header 6 is connected to the manifold 4 via the water supply pipe 5. This manifold 4 is attached to the lower end of the downcomer pipe 3 attached to the drum 2, and is attached so that its axis is located in the gas flow direction, that is, in the direction perpendicular to the axis of the drum 2 (second (See Figures A and B).
Therefore, the weight of the drum 2 is supported by the boiler support member 14 via the downcomer support member 11 attached to the lower end of the downcomer pipe 3. However, in this structure, the rotational restraint of the manifold 4 in the support member 11 is weak, and in the event of an earthquake, the downcomer pipe 3 is bent around the axis of the manifold 4 as shown in FIG. There is a risk that an accident such as deformation of the item 8 may occur. For this reason, conventional measures have been taken such as attaching a reinforcing member 7 to the casing 8 and attaching a downcomer stopper 9 to the downcomer pipe 3, but even these measures are insufficient for earthquake resistance. This is the reality.

The purpose of this invention is to eliminate the above-mentioned problems and provide a structure for a steam generator configured to significantly increase seismic strength.

In short, this idea consists of boiler drums, downcomer pipes,
In a steam generator that connects a manifold and an evaporation pipe to circulate feed water and generate steam, the manifold is arranged directly below the boiler drum and parallel to the boiler drum, and the gravity direction is set between the boiler drum and the manifold. This is an earthquake-resistant steam generator with a rigid frame structure that provides bottom support for the entire structure, with multiple downcomer pipes interposed with their axes at the bottom.

Examples of this invention will be described below.

In FIGS. 3 and 4 A and B, one manifold 1 is connected to the lower end of the downcomer pipe 3 arranged in the direction of gravity so as to be orthogonal to the boiler drum 2.
0 is arranged so that it is parallel to the boiler drum 2. Boiler drum 2, downcomer pipe 3, manifold 1
When 0 is viewed as a framework, each member is rigidly connected, creating a rigid frame structure, which can significantly improve earthquake resistance. The load of the boiler drum 2 is transmitted to the manifold 10 via the downcomer pipe 3, and the manifold 10 itself is supported by the boiler support member 14 via the support member 11.

Manifold 10 and lower header 6 of each heat transfer panel
and are connected by a water supply pipe 5 located horizontally, so if the length of the evaporator pipe 1 is set to be the same as that of the vertical water supply pipe of a conventional boiler, the vertical portion of the water supply pipe will be However, the overall height of the boiler can be kept low. Further, by adopting the rigid frame structure, there is no need to prevent the drum 2 from rolling laterally through the casing 8, and as a result, reinforcing members such as the support member 7 and the downcomer stopper 9 shown in FIG. 1 are unnecessary.

Figure 5 shows a state in which three downcomer pipes 3 are arranged, and the number of downdown pipes installed is not limited to two. By interposing a tube, a rigid frame structure can be obtained.

By implementing this idea, the strength of the steam generator can be greatly increased without using any special support members, and existing equipment can also be modified.

[Brief explanation of the drawing]

Fig. 1 is a front view of a conventional steam generator, Fig. 2A is a sectional view taken along line A-A in Fig. 1, Fig. 2B is a perspective view showing the arrangement of the boiler drum, downcomer pipe, and manifold; The figure is a front view of the steam generator according to this invention, Figure 4A is a sectional view taken along line B-B in Figure 3, and Figure 4A is a boiler drum and downcomer pipe of the equipment shown in Figures 3 and 4. , FIG. 5 is a perspective view showing the arrangement of the manifold, and FIG. 5 is a front view of the steam generator showing a modification of FIG. 3. 1... Evaporation pipe, 2... Boiler drum, 3... Downcomer pipe, 10... Manifold.

Claims (1)

[Scope of utility model registration request] In a steam generator that connects a boiler drum, a downcomer pipe, a manifold, and an evaporator pipe to circulate feed water and generate steam, a manifold is disposed directly below the boiler drum and parallel to the boiler drum, and the boiler drum and the manifold are connected to each other. A plurality of downcomer pipes with their axes in the direction of gravity are interposed between the
An earthquake-resistant steam generator characterized by having a rigid frame structure that supports the entire bottom.