JPH0820044B2 - Combustion chamber structure of multi-tube once-through boiler - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a combustion chamber structure of a multi-tube through-flow boiler in which noise is prevented from occurring.

[Conventional technology]

In recent years, noise generation of industrial machines has developed as a major social problem, and efforts have been made to reduce noise in various fields.
The same applies to boilers, and the prevention of combustion noise is a major issue. This combustion noise is caused by various factors such as the performance of the combustion device, fluctuations in combustion load, oscillatory combustion and the structure and size of the combustion chamber, and the compatibility of auxiliary equipment. Preventing is a difficult problem.

Therefore, in recent years, a method of reducing noise by providing a sound absorbing material in the gas passage at the exit of the combustion chamber or in the chimney has been adopted. Therefore, there is a drawback that the structure of the gas passage or the chimney becomes complicated and the cost becomes high.

[Problems to be Solved by the Invention]

The present invention has been made in view of the above problems, and an object thereof is to provide a combustion chamber structure having a simple structure in which combustion noise is prevented.

[Means for solving the problem]

The present invention has been made to solve the above problems, and an upper pipe header and a lower pipe header are connected by a large number of vertical water pipes, and each vertical water pipe forms an annular water pipe wall. In a multi-tube through-flow boiler having a combustion chamber inside, a combustion device is installed on either side of the upper space or the lower space of the combustion chamber, and the other side facing the combustion device is installed. A refractory castable is disposed on the upper surface of the fireproof castable, and a cushioning member having a soundproof function is provided on the upper surface of the fireproof castable on the combustion chamber side.

〔Example〕

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings.

In the drawing, both the upper header 1 and the lower header 2 are formed in an annular shape. The upper and lower headers 1 and 2 are connected by a large number of vertical water pipes, and these vertical water pipes are arranged as two inner and outer annular water pipe walls with a radial interval. A combustion gas passage 5 is formed between the inner annular water pipe wall 3 and the outer annular water pipe wall 4.

A combustion device 6 is provided inside the upper header 1. If desired, this combustion device 6 utilizes a space formed inside the lower header 2 and is preferably arranged there. A combustion chamber 7 is formed inside the inner annular water pipe wall 3.

Both ends of each vertical water pipe of both annular water pipe walls 3 and 4 are formed as a reduced diameter portion 8, respectively, and a pipe sheet of the upper header 1 (reference numeral omitted) and a pipe sheet of the lower header 2 (reference numeral), respectively. (Omitted) and welded.

The inner annular water pipe wall 3 is provided with an inner opening 9 extending over substantially the entire length of the vertical water pipe, and the combustion chamber 7 and the combustion gas passage 5 are communicated with each other through the inner opening 9. There is. Further, the outer annular water pipe wall 4 is provided with an outer opening 10 extending over substantially the entire length of the vertical water pipe.
The combustion gas passage 5 and the flue 11 are communicated with each other via 10.

On the other hand, the gap between the inner side of the lower header 2 on the side facing the combustion device 6 and the reduced diameter portion 8 of the vertical water pipe is filled with a refractory castable 13 to prevent leakage of combustion gas. Then, on the upper surface of the refractory castable 13 inside the lower header 2, sandy particles as a buffer member 12 are laminated.

The operation of the above-described structure will be described below.
The combustion gas generated in the combustion chamber 7 first exchanges heat with the inner annular water pipe wall 3 by radiant heat transfer, moves from the combustion chamber 7 toward the inner opening 9, branches there, and flows into the combustion gas passage 5. Then, the combustion gas passage 5 flows in a direction substantially orthogonal to the longitudinal direction of the vertical water pipe, that is, in a direction crossing the vertical water pipe,
In this flow, heat is exchanged with both annular water pipes 3 and 4 by contact heat transfer, and then they merge at the outer opening 10 and are discharged from the flue 11 to the outside. At this time, even if a combustion noise is generated or an oscillating combustion that induces the combustion noise is generated in the combustion chamber 7 due to the fluctuation of the combustion load and other factors, the combustion chamber wall facing the combustion device 6 is Since a sandy particle layer as a buffer member 12 is provided inside the lower header 2 which does not cause a resonance phenomenon. This is because the sandy particle layer is in a state in which it can be freely deformed, and this portion does not form a reflection wall as a resonator. Also,
One of the reasons is that the sandy particle layer itself also has a sound absorbing effect.
One.

In addition, in the said Example, although the combustion apparatus 6 was provided inside the upper header 1, and the sandy particle layer was provided inside the lower header 2, it was not limited to this and combustion was carried out. A configuration in which the device 6 is provided inside the lower header 2 and the sandy particle layer is provided in the portion of the upper header 2 using, for example, a wire net is also suitable.

Further, the cushioning member 12 is not limited to the sandy particle layer, but a fireproof porous or fibrous deformable material such as glass fiber or asbestos, or sandy particles are formed into a desired shape with an appropriate binder Even if it is done, the same effect can be obtained.

〔The invention's effect〕

As described above, according to the present invention, since the cushioning member having the soundproof function is provided in the portion facing the combustion device in the combustion chamber, the combustion chamber is prevented from acting as a resonator, and the vibration combustion is performed. Will not leak outside as combustion noise. Further, the cushioning member also exhibits a sound absorbing effect, so that the combustion noise is further reduced. Then, since only a very cheap cushioning member such as sandy particles is laminated, the manufacturing cost is significantly reduced as compared with the conventional noise countermeasure.
Further, since the structure of the combustion chamber can be made very simple, it is effective as a multi-tube once-through boiler of this type.

[Brief description of drawings]

The drawings show one embodiment of the present invention. FIG. 1 is a longitudinal sectional view and FIG. 2 is a sectional view taken along line II-II of FIG. 1 ...... Upper heading 2 ...... Lower heading 3 ...... Inner annular water tube wall 4 ...... Outer annular water tube wall 5 ...... Combustion gas passage 6 ...... Combustion device 7 ...... Combustion chamber 8 ...... Diameter 9 …… Inner opening 10 …… Outer opening 11 …… Flue 12 …… Cushioning member 13 …… Fireproof castable

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-56-158704 (JP, A) JP-A-49-78938 (JP, A) JP-A-49-60029 (JP, A) Actual publication 44- 19924 (JP, Y1) Showa 52-46336 (JP, Y1)

Claims (4)

[Claims] 1. An upper pipe header 1 and a lower pipe header 2 are connected by a number of vertical water pipes, an annular water pipe wall is formed by each vertical water pipe, and a combustion chamber 7 is provided inside the annular water pipe wall. In the multi-tube once-through boiler, the combustion device 6 is installed on either side of the upper space or the lower space of the combustion chamber 7, and the refractory castable 13 is installed on the other side facing the combustion device 6. A combustion chamber structure for a multi-tube through-flow boiler, which is arranged and provided with a cushioning member 12 having a soundproof function on the upper surface of the fireproof castable 13 on the combustion chamber side. 2. The combustion chamber structure for a multi-tube through-flow boiler according to claim 1, wherein the buffer member 12 is formed of a layer of particles such as sand. 3. The combustion chamber structure for a multi-tube through-flow boiler according to claim 1, wherein the buffer member 12 is formed of a glass fiber layer. 4. The combustion chamber structure for a multi-tube through-flow boiler according to claim 1, wherein the buffer member 12 is formed of a layer of asbestos.