JPS6021601Y2 - boiler water cooling wall - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a boiler water-cooled wall in which a combustion gas chamber wall is formed of wood pipes in a boiler.

[Prior art]

Conventionally, this type of water cooling wall has been constructed by arranging water pipes 3 closely between an upper header 1 and a lower header 2 provided at both the upper and lower ends, as shown in FIGS. 1 to 3. The combustion gas chamber has a water-cooled wall.

One side of this water-cooled wall faces the combustion gas chamber and the other side faces the flue, but in order to guide the combustion gas to the flue, parts of the water pipe 3 near the top end are alternately bent in opposite directions. The pipe portions 4 and 5 form a gap, and this gap serves as a smoke port through which combustion gas passes as shown by arrow 6 and is guided to the flue.

[Problem that the invention attempts to solve]

However, with this structure, the water pipe 3 needs to be bent, which increases the number of man-hours, and it is difficult to provide sufficient clearance for the combustion gas vent, so the gas flow velocity at the smoke vent becomes large and there is resistance. In addition, particularly in boilers that utilize waste gas containing a large amount of dust, the amount of dust adhering to the boiler increases, resulting in severe corrosion due to the erosion effect caused by the dust.

Another conventional example is shown in FIG. 4, in which a water-cooled wall 7 having a water pipe 3 is provided over the entire height of the combustion chamber 3, and no smoke vent is provided in the water-cooled wall.

Instead, a communication passage 10 is provided above the combustion chamber 8 and the flue 9 to guide the combustion gas, but such a structure increases the size of the boiler, which is disadvantageous for packaging.

In addition, there are some cases in which an intermediate pipe header is installed in the middle part in the height direction, and separate groups of wood pipes are provided from the middle part to the upper and lower parts, but the flow rate of the upper and lower wood pipe groups cannot be adjusted, and the circulation Water did not flow smoothly and effective heating was not achieved.

The present invention solves the above-mentioned problems of the conventional method by providing an intermediate pipe header in the middle and making the total cross-sectional area of the upper and lower wood pipe groups almost equal. The object of the present invention is to provide a boiler water cooling wall that allows for smooth circulation flow and stable operation.

[Means for solving problems]

This invention, as a means to solve the above problems,
An intermediate header is provided between the upper header and the lower header,
A plurality of straight wood pipes are connected between the upper header and the middle header to form an upper wood pipe group, and a plurality of straight wood pipes are connected between the middle header and the lower header. connecting to form a lower woodwind group, and closing one of the upper woodwind group and the lower woodwind group between adjacent woodwinds to form a woodwind wall that is sealed over the entire length of the woodwinds; forming the other group of woodwinds into a group of woodwinds with smoke holes by opening at least some of the adjacent woodwinds to form smoke holes;
The present invention provides a boiler water-cooled wall characterized in that the total cross-sectional area of the wood pipes in the group of wood pipes with smoke vents is approximately equal to the total cross-sectional area of the wood pipes in the wood pipe wall.

Embodiment The present invention will be described with reference to the drawings. In FIG. 5, an intermediate header 11 is provided between an upper header 1 and a lower header 2.

Water pipes 12 and 13 are provided on both sides of the middle header 11, and the straight water pipes 12 between the upper header 1 and the middle header 11 form an upper wood pipe group, and the lower header 2 and the middle The straight water pipes 13 between the header 11 and the header 11 are brought into close contact with each other and are closed to form a wood pipe wall.

The number of water pipes 12 on the upper header 1 side is smaller than the number of water pipes 13 on the lower header 2 side.

Adjacent water pipes 13 are in a closed state because they are in close contact with each other, but water pipes 12 are larger in size and fewer in number than water pipes 13, and their total cross-sectional area is approximately the same as the total cross-sectional area of water pipes 13. Therefore, the total width of the front projection of the water pipes 13 (the width shown in the front view of FIG. 5) is larger than the total width of the front projection of the water pipes 12, and a gap is provided between the water pipes 12 as the smoke vent 14. This allows combustion gas to pass through the smoke vent 14.

The space between the intermediate header 11 and the lower header 2 is sealed and closed over the entire length of the water pipe 12, and a wooden pipe wall is formed to maximize the radiation heat transfer area and prevent combustion gas from escaping. ing.

Therefore, effective radiation heat transfer can be performed.

In this embodiment, by changing the number, length, or position of the water pipes 12, the area or surface shape of the smoke vent 14 can be optimally set depending on the type and properties of the combustion gas, and the work is easy. At the same time, it is possible to reduce the passage velocity of combustion gas to reduce resistance, and to prevent dust accumulation and corrosion due to erosion effect.

Also, since the smoke vent 14 can be made quite large,
The ventilation loss is said to be small, and maintenance workers can enter the building, making it easier to repair the wood pipes 12 and 13.

The number of water pipes 12 is reduced compared to the water pipes 13, but the size is increased, and the total cross-sectional area of the wood pipes is kept equal, so the total width in frontal projection is small and the smoke vent 14 can be left.

In this case, since the total cross-sectional area of the wood pipes is the same, the gas-liquid mixture generated by the water pipes 13 is sent to the upper header 1 without having its flow rate restricted, allowing good flow.

If the cross section of the water pipe 12 is made rectangular and arranged so that the short side appears in FIG. 5, the smoke opening 14 can be made wide.

FIG. 6 shows an example of a waste heat boiler using a water cooling wall as shown in FIG.

17, 18, and 19 are other water cooling walls, 20 is a drum, 21 is a drum connection pipe, 22 is a gas inlet nozzle, 23 is a gas outlet nozzle, 24 is a combustion gas, and 25 is a hopper.

[Effect of idea]

With this invention, the position, size, and number of smoke vents can be optimally selected according to the surrounding conditions, regardless of the position, size, and number of wood pipes forming the wood pipe wall, making it easier to construct and work. The number of man-hours is reduced, the area of the smoke vent can be made relatively large, the passage speed of combustion gas is lowered, resistance is reduced, and dust adhesion is prevented, erosion effect is weakened, corrosion is prevented, and radiation By maximizing the heat transfer surface, effective heat transfer can be performed, and there is little ventilation loss. Furthermore, the boiler can be made compact without increasing the height, making it suitable for packaging. It enables stable operation by smoothing the flow passing through the wood pipe group without changing the cross-sectional area, and provides a highly reliable boiler water cooling wall with a long life. It has a huge effect.

[Brief Description of the Drawings] Fig. 1 is a perspective view of the conventional example, Fig. 2 is a side view thereof, Fig. 3 is a cross-sectional plan view taken along the line I-I, and Fig. 4 is a cross-sectional side view of another conventional example. 5 and 6 show an embodiment of the present invention; FIG. 5 is a front view, and FIG. 6 is a sectional side view of an example of application to a boiler. 1... Upper header, 2... Lower header, 3... Water pipe, 4, 5... Bent pipe section, 6
...Arrow, 7...Water cooling wall, 8...
... Combustion chamber, 9 ... Flue, 10 ... Communication passage, 11 ... Middle pipe header, 12, 13 ...
...Water pipe, 14...Smoke vent, 17,18,
19...Water cooling wall, 20...Drum, 2
1...Drum connection pipe, 22...Gas inlet nozzle, 23...Gas outlet nozzle, 24...
... Combustion residue, 25 ... Hopper.

Claims (1)

[Scope of utility model registration request] An intermediate header is provided between the upper header and the lower header,
A plurality of straight wood pipes are connected between the upper header and the middle header to form an upper wood pipe group, and a plurality of straight wood pipes are connected between the middle header and the lower header. connecting to form a lower woodwind group, and closing one of the upper woodwind group and the lower woodwind group between adjacent woodwinds to form a woodwind wall that is sealed over the entire length of the woodwinds; forming the other group of woodwinds into a group of woodwinds with smoke holes by opening at least some of the adjacent woodwinds to form smoke holes;
A boiler water-cooled wall characterized in that the total cross-sectional area of the wood pipes in the wood pipe group with smoke vents is approximately equal to the total cross-sectional area of the wood pipes in the wood pipe wall.