JPS5812910A - Multitubular type once-through boiler - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multi-tube once-through boiler using a finned wood tube in which fins are attached circumferentially or spirally to the wood tube.

Conventionally, water tube Fi flannel type water tubes used in multi-tube once-through boilers had the disadvantage that the heat transfer area per unit volume was small and the installation space was large.

The object of the present invention is to provide a multi-tube type through-flow pot which requires a small installation space by using finned wood pipes.

Hereinafter, an embodiment of the present invention will be described based on the drawings. An upper header 1 and a lower J-header 2 are both formed in an annular shape. The upper and lower pipe headers are connected by one or two inner water pipes 3 and outer water pipes 4, and these inner water pipes 3 are arranged as an annular wooden pipe wall with a slight gap. The outer water pipe 4 is also arranged as an annular water pipe wall with a slight gap. It is desirable that the diameter of the outer water pipe 4 is larger than that of the inner water pipe 3, that the pitch angle of the inner water pipe 3 and the outer water pipe 4G are the same, and that the inner and outer water pipes are arranged with a half pitch offset. A boiler outer wall 5 is provided at intervals on the outside of the water tube wall. A partition wall 6 that horizontally partitions the inside of the water pipe wall is provided at a lower position inside the water pipe wall, and the space above the partition wall 6 is formed into a combustion chamber 7, and the space below it is a flue 8.
is formed.

A combustion device 9 is provided inside the upper header 1.

Fins 10 are attached to the inner water pipe 3 and outer water pipe 4 in the circumferential direction or in a spiral shape.
Although the fins 10 may be attached only to the inner water tube 3 or only the outer water tube 4, the fins 10 may be attached only to the outer water tube 4.

To explain its function in the above configuration, the combustion gas generated in the combustion chamber 7 first exchanges heat with the inner water pipe 3 by radiation heat transfer, flows almost perpendicularly to the water pipe, and flows into the wood pipe group. It passes through the gap formed by the pipes while exchanging heat by convection heat transfer, and passes between the wooden pipe groups to reach the flue 8 formed inside the lower pipe header 2, and one part of the flue 8. It is discharged at low temperature from a chimney (not shown) provided in the chamber. Since each water tube is fitted with a fin 10, heat transfer is good.

As explained above, the present invention can provide a multi-tubular once-through boiler that requires less installation space because it has a large heat transfer area per unit volume.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing an embodiment of the invention, and FIG. 2 is a partially enlarged cross-sectional view. 16-i upper header, 2 lower header, 3 inner woodwind,
4 is an outer water pipe, 5 is an outer wall of the boiler, 6 is a partition wall, 7 is a combustion chamber, 8 is a flue, 9 is a combustion device, and 10 is a fin attached to the water pipe in a circumferential direction or in a spiral shape. 1/ Patent Applicant Miura Kogyo Co., Ltd. Representative Yasushi Miura 1 Figure 2

Claims (1)

[Claims] Both the first header 1 and the lower header 2 are formed in an annular shape, and the upper and lower headers 1 and 2 are connected by a large number of inner water pipes 3 and outer water pipes 4, and these inner water pipes 3 are provided with a slight gap. Since the outer water pipe 4 is arranged as an annular water pipe wall, the outer water pipe 4 is also arranged as an annular water pipe wall with a slight gap, and the boiler outer wall 5 is provided at intervals on the outside of the water pipe wall. A partition wall 6 is provided at the lower position to horizontally partition the inside of the combustion chamber 7, creating a square space with a gap of 6 in the combustion chamber 7, and the lower space is formed into a flue 8. A multi-tubular once-through boiler characterized in that a combustion device 9 is provided at the inner water W3 and/or outer water pipe 4, and fins 10 are attached to the inner water W3 and/or the outer water pipe 4 in a circumferential direction or in a spiral shape.