JPS60202260A - Hot water boiler - Google Patents

Abstract

PURPOSE:To obtain enough thermal efficiency by a constitution wherein a baffle body is arranged in a combustion chamber so as to disturb combustion gas and at the same time to flow along water tubes. CONSTITUTION:The high temperature combustion gas 19 generated in a combustion chamber 4 collides against the lower end of a baffle body 21 and, after that, flows through combustion gas passages 23. In this case, the combustion gas 19 exchanges heat with a second header 2 and water tubes 3 in order and escapes through an exhaust port 16. The combustion gas 19 collides against two kinds of baffle plates 20a and 20b arranged in the combustion gas passage 23, resulting in throttlingly passing through gaps 26b and 27a, each of which is larger than the other gap of the baffle plate. The gas 19 changes its flow direction at the gap 26b, disturbs itself, collides against the water tubes 3 again changes its flow direction at the gap 27a. Similar is the case that the gas 19 flows from the gap 27a to the gap 26b. Accordingly, because the combustion gas 19 changes its flow direction and collides against the water tubes 3 while being disturbed, the thermal transfer coefficient turns to be higher, resulting in improving thermal efficiency.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention provides a multi-tubular once-through heat exchanger that improves thermal efficiency by arranging a buckle body in the combustion chamber and inserting and fixing baffles into the water tube walls. Regarding the equipped hot water boiler.

Structure of the conventional example and its problems Conventionally, a hot water boiler equipped with this type of multi-tubular once-through heat exchanger has a first header 1 which is formed in an annular shape as shown in Figs. Two headers 2 were connected by a large number of water pipes 3, and a water pipe wall was formed by these water pipes 3, and a combustion chamber 4 was formed inside this water pipe wall. A partition plate 5 having a disk shape and having semicircular notches arranged therein was disposed and fixed in the combustion chamber 4 so that the notches were arranged alternately. A bottom plate 6 was disposed on the lower surface of the second header 2, and an air passage 9 communicating with the fan 7 and the air outlet 8 was disposed on the lower surface of the bottom plate 6. A nozzle 11 connected to a fuel pump 10 on the same axis as the air jet hole 8 was directed toward substantially the center of the combustion chamber 4 . The heat insulating material 12 was in close contact with the first header 1 and the second header 2, and was wound around the outside of the water tube wall with an appropriate interval.

Further, a heat insulating material 12 was also wrapped around a lid 13 disposed on the top surface of the first header 1. Furthermore, the insulation material 12 is
14, was supported and fixed by the exhaust top 15. An exhaust hole 16 was arranged approximately in the center of the lid 13. Gap 1
7 is formed between the notch of the partition plate 5 and the heat insulating material 12,
A gap 18 was formed between the circumferential portion of the partition plate 50 and the heat insulating material 12.

After the high temperature combustion gas 19 generated in the combustion chamber 4 collides with the lowermost partition plate 5 as shown by the arrow, the gap 17 and the gap 18
, flowed along the partition plate 5 , and was exhausted from the exhaust hole 16 . In this configuration, most of the combustion gas 19 flows along the partition plate 5 and becomes a step-like flow with a sudden direction change at the gap 17, and a portion of the combustion gas 19 passes through the gap 191. . At this time, a sudden change in direction at gap 17,
The combustion gas 19 passing through the gap 18 joins the flow along the partition plate 5, and vice versa? Although the flow of the combustion gas 19 is greatly turbulent and the heat transfer coefficient is improved because the flow is divided to pass through the combustion gas 19, it has the following problems.

The velocity distribution of the combustion gas 19 flowing along the partition plate 5 is fastest near the center, and becomes slower as it approaches the ends because it becomes more susceptible to the passage resistance of the water pipe 3. The combustion gas 19 reverses in the gap 17, but due to the influence of the buoyancy of the combustion gas 19, the combustion gas 19 tends to reverse around the water pipe 3 and the partition plate 6. Therefore, the combustion gas 19 mainly flowed through the center of the partition plate 5 and away from the water pipe wall. Even if the flow of combustion gas 19 is disturbed and the heat transfer coefficient is increased by rapid reversal, branching, or merging, this combustion gas 19
If the flow is biased, sufficient thermal efficiency cannot be obtained.

Since the partition plate 5 is fixed to the water pipe 3 and arranged to cover the burner, cleaning and
Maintenance is not possible.

Purpose of the Invention The present invention solves these conventional problems.By arranging combustion gas to flow along the water pipe while turbulent, sufficient thermal efficiency can be obtained, and cleaning and maintenance can be performed from the first header. The purpose is to

Structure of the Invention In order to achieve this object, the present invention provides a removable baffle body that leaves a combustion gas path between the combustion chamber and the outer cylinder, and a baffle body on the water pipe wall located in the combustion gas path. fixed,
A gap is formed between this baffle and the outer cylinder and baffle body located outside the water pipe wall.

With this configuration, the combustion gas flowing through the combustion gas path flows along the water tube while being disturbed by the baffle, so thermal efficiency is improved. The baffle body is removably arranged, making it easy to remove the baffle body.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 3 to 6. An annularly formed baffle /L/20a and a baffle 20b having a smaller outer diameter and inner diameter than the buff /'l/20a are alternately inserted into the water pipe wall and fixed at appropriate intervals. An elliptical-cylindrical pubflu body 21 with closed upper and lower ends is supported by the lid 13 via an ω metal fitting 22 so as to be located inside the water pipe wall formed by the water pipe 3, and is connected to the heat insulating material 12 and the baffle body. A combustion gas path 23 is formed between the two. A middle cylinder 24 in which a plurality of air jet holes 8 are arranged, and a ring-shaped auxiliary combustion cylinder 25 on a concentric axis with the middle cylinder 24 are arranged in the path of the bottom plate 6.
) A burner is constructed by arranging a nozzle /L/11 in the center and facing the middle cylinder 24 on the circumferential surface of the second header 2, and an air jet hole 8 arranged on the same axis as this nozzle /L711. are doing. The air outlet 8 communicates with a blowing passage 9.

A gap 26a is formed between the insulation material 12 and the baffle 20a, and a gap 26b is formed between the insulation material 12 and the baffle 20b. A gap 27a is formed between the buff/L/20a and the baffle body 21, and a gap 127b is formed between the buff/L/20a and the baffle body 21.
20b and the baffle body 2117). Further, the gap 111278 is larger than the gap Un 26 a, and the gap 26b is larger than the gap 2Th. Note that the same members as in FIG. 1 are given the same numbers.

2, the high-temperature combustion gas 19 generated in the combustion chamber 4 collides with the lower end of the buckle body 21 and then flows through the combustion gas path 23 as shown by the arrow. At this time, heat exchange is performed in the order of the second header 2 and the water tube 3, and the air is exhausted from the exhaust hole 16. Two types of buffs/I/20a are provided in which the combustion gas 19 is disposed in the combustion gas path 23.

Collision with 20b, large gap, gap 26b, gap 27
It is narrowed down and passes through a. After changing direction at the gap 26b, it is disturbed, collides with the water pipe 3, and changes direction at the gap 27a. The same holds true when flowing from the gap 27a to the gap 26b. Therefore, the combustion gas 19 changes direction and collides with the water tube 3 while being turbulent, so that the heat transfer coefficient is increased and the thermal efficiency is improved.

Since the baffle body 21 is supported only by the ω metal fittings 22, it is detachable. Therefore, cleaning and maintenance of the combustion chamber 4 can be easily performed from the first header 1 side by removing the baffle body 21.

Next, another embodiment of the present invention will be described using FIGS. 7 and 8. The difference in FIGS. 7 and 8 from the above embodiment is that a vent hole 28 is provided in one type of baffle 1L/20,
This vent hole 28 is fixed to the water pipe 3 so that it does not overlap, and the gap 26 and the gap @27 are about 2 marks. According to this configuration, the combustion gas 19 flows into the combustion gas path 23 as shown by the arrow, and then flows into the baffle 20. Q, the water flows toward the ventilation hole 28 while colliding with the water pipe 3 at right angles, and undergoes a sudden direction change before and after passing through the ventilation hole 28. Therefore, since the combustion gas 19 is greatly turbulent, the heat transfer coefficient is further increased, and the thermal efficiency is improved.

Effects of the Invention As described above, according to the hot water boiler of the present invention, (1) Since the combustion gas is violently turbulent and collides with the water pipe, the heat transfer coefficient is increased and the thermal efficiency is improved.

娑) Since the baffle body is removably arranged, cleaning and maintenance of the combustion chamber can be easily performed from the first belly button side by removing the baffle body.

It has the following effects.

[Brief explanation of the drawing]

Figure 1 is a vertical sectional view of a hot water boiler equipped with a conventional multi-tubular once-through heat exchanger, Figure 2 is a sectional view taken along line A-p in Figure 1,
The figure is a longitudinal sectional view of a hot water boiler that is an embodiment of the present invention, FIG. 4 is a sectional view taken along line A-A in FIG. 3, and FIG.
-B' line sectional view, FIG. 6 is an enlarged view of the main part of FIG. 3, FIG. 7 is a vertical sectional view of a hot water boiler which is another embodiment of the present invention, and FIG. -p: Line sectional view. 1...first header, 2...second header, 3...
・Water pipe, 4... Combustion chamber, 8... Air nozzle, 11.
... Nozzle, 20.20a, 20b... Baffle,
21...Panful body, 24...Middle cylinder, 25...Auxiliary combustion cylinder, 26.26a. 26b=・Gap, 27.27a, 27b-・Gap, 2
8...Vent hole. Name of agent: Patent attorney Toshio Nakao and one other person
1 Figure 2 Figure 3 Figure 4

Claims (3)

[Claims] (1) A first header formed in an annular shape and a second header are connected by a number of water pipes, these water pipes are arranged in a groove ring shape with the water pipe wall, and a combustion chamber is formed inside the water pipe wall, An outer cylinder is provided on the outside of the water tube wall, a burner is disposed on the second header side of the combustion chamber, and a baffle body is freely attachable and detachable while leaving a combustion gas path between the outer cylinder and the combustion chamber. A plurality of baffles formed in an annular shape are fixed to the water pipe wall at appropriate intervals, and gaps are formed between the baffles and the outer cylinder and the baffle body, respectively. boiler. (2) The hot water boiler according to claim 1, wherein two types of baffles having different sizes in both outer diameter and inner diameter are alternately arranged. (3) Claim 1 in which a ventilation hole is provided in the baffle
Hot water boiler as described in section. 4) The burner has a plurality of air blowing holes arranged in a mud cylinder, a ring-shaped auxiliary combustion cylinder on an axis concentric with this cylinder, and a water pipe or between the inner peripheral surface of the second header and directed toward the cylinder. A hot water boiler according to claim 1, which comprises a fuel injection nozzle!