Boiler

Patent metadata

Field	Value
Publication number	US-10330309-B2
Application number	US-201615556127-A
Country	US
Kind code	B2
Filing date	Feb 17, 2016
Priority date	Mar 24, 2015
Publication date	Jun 25, 2019
Grant date	Jun 25, 2019

Abstract

The boiler ( 1 ) according to an aspect of the present invention is provided with a boiler main body ( 3 ) and a steel support frame ( 5 ) that suspends and supports the boiler main body ( 3 ). The boiler main body ( 3 ) is provided with: a furnace wall ( 11 ) composed of water pipes ( 15 ) and plate-like fins ( 16 ) arranged in an alternating manner; an internal element ( 4 ) housed inside the furnace wall ( 11 ); and a buffering mechanism ( 20 ) configured to attenuate vibration energy when relative displacement, of the internal element ( 4 ) with respect to the furnace wall ( 11 ), occurs that exceeds a predetermined value. The buffering mechanism ( 20 ) is disposed between the furnace wall ( 11 ) and the internal element ( 4 ) in the main vibration direction of the internal element ( 4 ), and the load on the buffering mechanism ( 20 ) caused by interference is transmitted to the fins ( 16 ).

First claim

The invention claimed is:

1. A boiler, comprising:
a boiler main body; and
a steel support frame suspending and supporting the boiler main body,
wherein the boiler main body includes:
a furnace wall composed of water pipes and plate-like fins arranged in an alternating manner;
an internal element housed inside the furnace wall; and
a buffering mechanism configured to interfere with the internal element to attenuate vibration energy when relative displacement, of the internal element with respect to the furnace wall, occurs and exceeds a predetermined value,

wherein the furnace wall includes an inner surface facing the internal element and an outer surface opposite the inner surface,
the buffering mechanism is fixed to the inner surface of the furnace wall,
the buffering mechanism includes an energy attenuating body configured to compress to plastically deform due to the interference, and
the energy attenuating body is configured to have mechanical characteristics whereby the energy attenuating body yields prior to the internal element and the furnace wall becoming damaged when the internal element interferes with the energy attenuating body.

2. The boiler according to claim 1 , wherein a load on the buffering mechanism, caused by the interference resulting from the relative displacement in a main vibration direction of the internal element, is transmitted to the fins.

3. The boiler according to claim 1 ,
wherein the buffering mechanism includes a frame supporting the energy attenuating body and fixed to the furnace wall, and
wherein the frame is fixed to the fins of the furnace wall.

4. The boiler according to claim 2 ,
wherein the buffering mechanism includes a frame supporting the energy attenuating body and fixed to the furnace wall, and
wherein the frame is fixed to the fins of the furnace wall.

5. The boiler according to claim 3 , wherein the frame has energy attenuating capacity to compress to plastically deform due to the interference.

6. The boiler according to claim 4 , wherein the frame has energy attenuating capacity to compress to plastically deform due to the interference.

7. The boiler according to claim 1 , wherein the energy attenuating body comprises a honeycomb structure, and
an axial line of the honeycomb structure is disposed along the main vibration direction.

8. The boiler according to claim 3 , wherein the energy attenuating body and the frame of the buffering mechanism are made from heat-resistant steel.

9. The boiler according to claim 3 , wherein:
the frame includes a web, and a pair of flanges connected to both ends of the web;
the energy attenuating body is fixed to the web of the frame; and
the pair of flanges straddles the water pipes of the furnace wall and is fixed to the fins.

10. The boiler according to claim 9 , wherein:
the energy attenuating body is fixed to the web of the frame by welding; and
the pair of flanges is fixed to the fins by welding.

11. The boiler according to claim 10 , wherein the buffering mechanism is fixed to the fins such that the load caused by the interference is not directly transmitted to the water pipes.

12. The boiler according to claim 1 , wherein the internal element is piping.

13. The boiler according to claim 2 , wherein a pair of the buffering mechanisms is provided, on both a forward side and a return side of the main vibration direction.

14. The boiler according to claim 1 , wherein the buffering mechanism includes:
a damping element fixed to the furnace wall, in which bending and shearing occurs; and
an interference body fixed to the internal element, with which the damping element interferes.

15. The boiler according to claim 14 , wherein a pair of the interference bodies is provided, on both a forward side and a return side of the main vibration direction.

Assignees

• Mitsubishi Hitachi Power Sys

Inventors

• Morishita Kunihiro
• Shimono Masaki
• Kato Motoki

Classifications

• F22B37/107 Primary

  Protection of water tubes · CPC title

• F22B21/341

  Vertical radiation boilers with combustion in the lower part · CPC title

• F22B37/102

  Walls built-up from finned tubes · CPC title

• F22B37/10

  Water tubes; Accessories therefor · CPC title