JPH0571602U - Boiler structure - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a boiler structure capable of miniaturizing a vertical cylindrical pressure vessel by increasing the storage efficiency of the boiler in the vertical cylindrical pressure vessel. [Composition] Combining three diamond-shaped boiler blocks 4
An outer wall 3 of a furnace wall of a fluidized bed boiler 2 is formed in a hexagonal shape having six corners when viewed from above, and the fluidized bed boiler 2 is housed in a vertical cylindrical pressure vessel 5 coaxially. Therefore, the storage efficiency of the fluidized bed boiler 2 in the vertical cylindrical pressure vessel 5 can be increased,
The vertical cylindrical pressure vessel 5 can be miniaturized.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 In the present invention, in the coal-fired thermal power generation, the boiler used for the pressurized fluidized bed combined cycle power generation and the coal gasification combined cycle power generation system, which has been developed with the aim of achieving both environmental protection and economic efficiency, is symmetrical. In order to balance and protect the pressure operation boiler, the ratio of the boiler to the vertical cylindrical pressure vessel that stores the boiler is increased, that is, the storage efficiency is increased and the diameter of the vertical cylindrical pressure vessel is reduced to reduce the boiler. The present invention relates to a boiler structure that can reduce the size of equipment and make effective use of space.

[0002]

[Prior Art]

 Currently, in the coal-fired thermal power generation, the pressurized fluidized bed combined cycle power generation and coal gasification combined cycle power generation system, which have been developed with the aim of achieving both environmental protection and economic efficiency, have high thermal efficiency and are less likely to generate environmental pollutants. Various studies have been conducted to find that it is optimal.

The pressurized fluidized bed boiler is a boiler used in the pressurized fluidized bed combined cycle power generation, in which the fluidized bed boiler is housed in a pressure vessel and operated under pressurized conditions. In addition to guiding the steam generated in the boiler to a steam turbine to generate electricity, the exhaust gas generated in the fluidized bed boiler can be used to rotate the gas turbine to generate electricity and drive the compressor. In addition to high thermal efficiency, low combustion temperature and long internal residence time of exhaust gas, supply of desulfurizing agent together with fuel reduces the amount of sulfur oxides and nitrogen oxides generated and increases It is expected and considered that the equipment can be downsized due to its thermal efficiency. Also, there is a crude gas cooler that is used for combined coal gasification combined cycle power generation, and the crude gas cooler is a boiler that performs heat exchange by convective heat transfer with gas under pressure.

Of these, a pressurized fluidized bed boiler currently under study will be described as an example with reference to FIGS. 4 and 5.

Reference numeral 11 in the figure is a pressurized fluidized bed boiler, and the pressurized fluidized bed boiler 11 has a vertical cylindrical pressure vessel 12 and a proper number of square-shaped boiler blocks 14 when viewed from above (one in the figure). ), Which is housed in the vertical cylindrical pressure vessel 12 and is capable of performing pressure combustion, and ash in the boiler exhaust gas discharged from the fluidized bed boiler 13 through a duct. And a dust collector (not shown) for removal. In the figure, reference numeral 15 is a header provided in each boiler block 14.

[0006]

[Problems to be solved by the device]

 However, in the pressurized fluidized bed boiler 11 in which the fluidized bed boiler 13 is housed in the vertical cylindrical pressure vessel 12 as described above, since the fluidized bed boiler 13 has a rectangular shape when viewed from above, the vertical cylindrical pressure vessel The vertical cylindrical pressure vessel 12 is inevitably large in size as compared with the size of the fluidized bed boiler 13 because the storage efficiency of the vertical cylindrical pressure vessel 12 is large. It was a problem from the viewpoint of effective use of space.

In view of the above situation, the present invention can improve the storage efficiency of the boiler in the vertical cylindrical pressure vessel, downsize the vertical cylindrical pressure vessel, and in turn, downsize the boiler equipment itself, and save space. The purpose is to provide a boiler structure that can be used.

[0008]

[Means for Solving the Problems]

 According to the present invention, the outer wall of the boiler furnace wall to be housed in the vertical cylindrical pressure vessel is formed in a polygonal shape having five or more corners when viewed from above, and the loop tube is housed in the boiler furnace wall. It relates to a characteristic boiler structure.

[0009]

[Action]

 By forming the outer wall of the boiler furnace wall to be housed in the vertical cylindrical pressure vessel into a polygonal shape with five or more corners when viewed from above, the ratio of the boiler to the vertical cylindrical pressure vessel can be increased and the vertical cylinder The diameter of the pressure vessel can be reduced, and the vertical cylindrical pressure vessel can be miniaturized.

[0010]

【Example】

 Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 and 2 by taking a pressurized fluidized bed boiler as an example.

In the pressurized fluidized bed boiler 1, three diamond-shaped boiler blocks 4 are combined so that the outer wall 3 of the furnace wall of the fluidized bed boiler 2 has a hexagonal shape with six corners when viewed from above. The fluidized bed boiler 2 is housed coaxially in the vertical cylindrical pressure vessel 5. In the figure, 6 is a horizontal loop pipe, 7 is a pipe holder provided in each boiler block 4, and 8 is a partition wall for partitioning each boiler block 4.

The occupying area of the fluidized bed boiler 2 configured as described above with respect to the vertical cylindrical pressure vessel 5 will be specifically described based on FIGS. 3A and 3B in comparison with the conventional case. For the sake of explanation, it is assumed that the vertical cylindrical pressure vessel 5 is inscribed with the outer wall 3 of the furnace wall of the fluidized bed boiler 2, and the vertical cylindrical pressure vessel 12 is inscribed with the outer wall of the furnace wall of the fluidized bed boiler 13. The description will be made assuming that the outer wall of the single-layer boiler 13 furnace wall is a square.

When the radii of the vertical cylindrical pressure vessels 5 and 12 are R, the dimension from the axis of the fluidized bed boiler 2 to the corner is also R, and the dimension from the axis of the conventional fluidized bed boiler 13 to the corner. Also becomes R, and therefore the occupied area of the fluidized bed boiler 2 with respect to the vertical cylindrical pressure vessel 5 (hatched portion in FIG. 3 (A)) is (3/2) 3 ^1/2 R ² (≈2.6 R ² ). Also, the occupied area of the fluidized bed boiler 13 for the vertical cylindrical pressure vessel 12 (the hatched portion in FIG. 3 (B)) is 2R ² , which clearly indicates the occupied area of the fluidized bed boiler ² for the vertical cylindrical pressure vessel 5 in the present invention. It can be seen that the area is increased by 0.6R ² as compared with the case of the conventional fluidized bed boiler 13 having a rectangular shape when viewed from above.

Therefore, the occupied area of the fluidized bed boiler 2 with respect to the vertical cylindrical pressure vessel 5 can be increased, and the diameter of the vertical cylindrical pressure vessel 5 can be made smaller than the size of the fluidized bed boiler 2 to achieve downsizing. As a result, the size of the boiler equipment can be reduced, and the outer wall 3 of the fluidized-bed boiler 2 furnace wall is hexagonal with 6 corners when viewed from above. Can be equalized to achieve uniform heat exchange in each boiler block 4, and the headers 7 can be symmetrically arranged, which is convenient for pressure balance in the vertical cylindrical pressure vessel 5.

It should be noted that the present invention is not limited to the illustrated and described embodiments, and for example, the partition walls 8, 8a, 8b are simply omitted and the heat flow movement is performed by using the boiler blocks 4, 4a, 4b as free spaces. It is optional to make it possible to apply it, to apply it to a heat exchanger under pressure other than the pressurized fluidized bed boiler, and various modifications can be made without departing from the gist of the present invention. is there.

[0016]

[Effect of the device]

 As described above, according to the boiler structure of the present invention, the storage efficiency of the boiler in the vertical cylindrical pressure vessel can be increased, so that the vertical cylindrical pressure vessel can be downsized and the boiler equipment can be downsized. Various excellent effects such as the obtained space can be effectively used can be obtained.

[Brief description of drawings]

FIG. 1 is a schematic plan view showing a boiler structure of the present invention and is a view taken in the direction of arrows II in FIG.

FIG. 2 is a schematic side view of FIG.

3A and 3B are views for explaining the occupancy state of the boiler with respect to the vertical cylindrical pressure vessel, FIG. 3A is a diagram showing the occupancy state of the boiler with respect to the vertical cylindrical pressure vessel in the boiler structure of the present invention; [Fig. 4] is a diagram showing a state in which a boiler is occupied by a vertical cylindrical pressure vessel in a conventional boiler.

4 is a schematic plan view showing a currently developed pressurized fluidized bed boiler, which is a view taken in the direction of arrows IV-IV in FIG.

5 is a schematic side view of FIG.

[Explanation of symbols]

 1 Pressurized fluidized bed boiler 2,2a, 2b Fluidized bed boiler 3,3a, 3b Outer wall 4,4a, 4b Boiler block 5 Vertical cylindrical pressure vessel 6,6a, 6b Horizontal loop pipe 7,7a, 7b Pipe shifter 8, 8a, 8b partition wall

Claims (1)

[Scope of utility model registration request] 1. An outer wall of a boiler furnace wall housed in a vertical cylindrical pressure vessel is formed into a polygonal shape having five or more corners when viewed from above, and a loop pipe is housed in the boiler furnace wall. Characteristic boiler structure.