JPS62210303A - Comgustion chamber structure of 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 [Technical Field of the Invention] The present invention relates to a combustion chamber structure of a multi-tubular once-through boiler that prevents noise generation.

[Technical background of the invention and its problems] In recent years, noise generation from industrial machinery has developed as a major social problem, and efforts are being made to reduce noise in various fields. The same is true for boilers, and prevention of combustion noise is a particularly important issue. This combustion noise is caused by a complex of factors, including the performance of the combustion equipment, fluctuations in combustion load, vibration combustion, the structure and size of the combustion chamber, and the compatibility of attached equipment. This is a difficult problem. Therefore, in recent years, a method has been adopted to reduce noise by installing sound absorbing materials in the combustion chamber outlet gas passage or in the chimney.

For this reason, the structure of the gas passage or chimney becomes complicated, resulting in high cost.

[Object of the Invention] The present invention has been made in view of the above-mentioned circumstances, and its object is to provide a combustion groove structure with a simple groove path that prevents the generation of combustion noise.

[Summary of the Invention] In order to achieve the above object, the present invention provides a multi-tubular mass flow boiler in which an upper header and a lower header are connected by a large number of water pipes, and a combustion chamber is provided inside the boiler. A combustion device is installed on one side of the upper space or the lower space, and a castable is placed on the other side facing this, and a buffer member with a soundproofing function is provided on the upper surface of the castable. It is characterized by:

[Embodiments of the Invention] The present invention will be described below based on embodiments shown in the drawings. Both the upper header (1) and the lower header (2) are formed in an annular shape. The upper and lower headers fl), f2) are connected by a number of vertical water pipes, which are arranged in two radially spaced concentric annular water pipe walls. Inner annular water tube wall (3) and outer annular water tube wall (4)
A combustion gas passage (5) is formed between the two. A combustion device (]6) is provided inside the upper header (1). If desired, this combustion device (6) can be installed in the lower header (2).
) can also be placed here by utilizing the space formed inside. In the figure (7) is the inner annular water pipe wall r: 3)
The combustion chamber is formed inside the combustion chamber. annular water pipe wall (3),
Both ends of each water tube (4) become diameter-reduced portions (8), which are temporarily fitted and welded to the tube plate of the upper header (1) and the tube of the lower header (2), respectively. The inner annular water tube wall (3) is provided with an opening (9) over the entire length of the tube, which opens into the combustion chamber (7).
) and the combustion gas passage (5) are in communication with each other.

In the outer annular water pipe wall (4) there is an opening (
1ffl is provided, and the combustion gas passage (5) and flue 0D are communicated with each other.

On the other hand, the gap between the inner side of the header and the reduced diameter part of the water pipe on the side facing the combustion equipment is filled with refractory castable (convex) to prevent leakage of J-brit combustion gas. ii'!l' as part + A'ID
The particles are formed in an i-layer.

To explain its function in the above configuration, the combustion gas generated in the combustion chamber (7) first exchanges heat with the inner annular water tube wall (3) by radiant heat transfer, and then flows through the combustion chamber ( 7) towards the opening (9), flows through the combustion gas passage (5) almost at right angles to the longitudinal direction of the tube, i.e. in a direction transverse to the tube, merges at the mouth of the opening, and from the flue fl. It is discharged to the outside. At this time, even if combustion noise is generated or vibration combustion that induces combustion noise occurs in the combustion chamber due to fluctuations in combustion amount or other factors, the inner side of the lower header, which is the wall of the combustion chamber facing the combustion device, Since sandy particle layers are provided as both M members, no resonance phenomenon occurs. This seems to be because the sandy particle layer is in a state where it can be freely deformed, so this part does not form a reflecting wall as a resonator. It is also thought that one of the reasons is that the sandy particle layer itself has a sound absorbing effect.

In the above embodiment, the combustion device is installed inside the upper header, and the sandy particle layer is installed inside the lower header. However, the present invention is not limited to this, and the combustion device is installed inside the lower header. The inner structure may be such that a sandy particle layer, such as a wire mesh, is provided on the upper pipe header, or a combustion device installation opening is provided on the water pipe wall, and the water pipe wall or combustion device facing the water pipe wall is provided with a combustion device installation opening. It is also possible to provide a structure in which sandy particles are provided inside the lower header, etc., where they do not face the lower pipe header.

In addition, the buffer material is not limited to the sand particle layer, but also fire-resistant porous or fibrous deformable materials such as glass fiber and asbestos, and sand particles with a binder (even one formed into the desired shape with a trowel). The same effect can be obtained.

[Effects of the Invention] Since the present invention is configured as described above, the following effects can be obtained.

・:1) The combustion chamber is prevented from acting as a resonator, and combustion vibrations are no longer leaked to the outside as combustion noise.

(2) The buffer member also exhibits a sound absorption effect, further reducing the problem of combustion noise.

(3) Manufacturing costs are significantly lower than conventional noise countermeasures, which involve simply laminating (simply adding appropriate amounts of) very cheap buffering materials such as sandy particles.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of one embodiment of the present invention, and FIG. 2 is a [-n sectional view of FIG. 1. <1)... Upper header (2)... Lower header (3)... Inner annular water pipe wall (4)... Outer annular water pipe wall (5)... Combustion gas passage (6)...
・Combustion device (7)...Combustion (8)...
・Reduced diameter part of water pipe (9)... Opening 11 of inner annular water pipe wall (D... Opening of outer annular water pipe wall (11)...
・Flute surface...Buffer member ■...Fireproof castable patent applicant Miura Kogyo Co., Ltd. Figure 1

Claims (4)

[Claims] (1) In a multi-tubular once-through boiler in which an upper header (1) and a lower header (2) are connected by a number of water pipes, and a combustion chamber (7) is provided inside the boiler, the space above or below the combustion chamber is A combustion device (6) is installed on one side of the space, a castable (13) is placed on the other side facing this, and a buffer member (12) having a soundproofing function is installed on the upper surface of the castable (13). ) Combustion chamber structure of a multi-tubular once-through boiler. (2) The combustion chamber structure of a multi-tubular once-through boiler according to claim 1, wherein the buffer member is formed of a layer of particles such as sand. (3) The combustion chamber structure of a multi-tubular once-through boiler according to item 1 or 2, wherein the buffer member is formed of a layer of glass fiber. (4) The combustion chamber structure of a multi-tubular once-through boiler according to item 1 or 2, wherein the buffer member is formed of a layer of asbestos.