JP7099864B2 - Multi-tube once-through boiler - Google Patents

Description

Application of Article 30, Paragraph 2 of the Patent Law Takayuki Ino requested Nippon Kikan Co., Ltd. to exhibit the multi-tube once-through boiler invented by Tadayuki Ino at the 21st Fabex 2018. It was released from April 11, 2018 to April 13, 2018.

The present invention relates to a multi-tube once-through boiler that generates steam by heating a large number of water pipes, and more particularly to a structure of a multi-tube once-through boiler that can use recycled oil as a fuel.

In a multi-tube once-through boiler, for example, as shown in FIGS. 8 and 9 disclosed in Patent Document 1, a plurality of water pipes are arranged in a vertical direction in a cylindrical combustion cylinder with upper and lower bottoms, and an annular upper portion is provided. The pipes 1 and the lower pipes 2 are connected by two rows of water pipes, the inner water pipe row 3 and the outer water pipe row 4, and the adjacent inner water pipe row 3 and the adjacent outer water pipe row 4 are closed (closed). Fins 8) and a part of the water pipes in the inner water pipe row 3 are opened (inner smoke vent 5) to form a combustion gas passage 7 between the inner water pipe row 3 and the outer water pipe row 4, and the lower part is formed. It is configured to supply boiler water to each water pipe from the pipe gathering 2.
In the above structure, by supplying fuel to the burner 10 installed in the combustion cylinder and burning it, combustion gas is generated in the combustion chamber 9, and the combustion gas is supplied from the combustion gas passage 7 to the outside of a plurality of water pipes. The structure is such that the boiler water in the water pipe is heated and evaporated, and the consumed steam is taken out from the upper pipe gathering 1. Further, the combustion exhaust gas is discharged from the flue 12 as combustion exhaust gas whose temperature has dropped through the combustion gas passage 7 and the outer flue port 6.
The peripheral portions of the upper pipe gathering 1 and the lower pipe gathering 2 are covered with the refractory material 13, and the entire combustion cylinder is covered with the heat insulating material 14.

Japanese Patent No. 2914647

However, according to the above-mentioned multi-tube once-through boiler, the combustion chamber 9 is sealed and the inside of the combustion cylinder is difficult to clean, so that the combustion gas to be burned is limited and waste oil that easily generates residual ash, etc. There was a problem that it could not be used.
Further, impurities contained in water adhering to the inside of the water pipe are cleaned by using chemicals for cleaning, but there is a problem that a sufficient cleaning effect cannot be obtained.

The present invention has been made in view of the above circumstances, and provides a multi-tube once-through boiler capable of using waste oil as a combustion gas for generating consumed steam and easily cleaning a water pipe. The purpose is.

In order to achieve the above object, in the present invention (claim 1), both ends of each of a plurality of water pipes are communicated with each other to supply boiler water to each water pipe, while a combustion chamber is formed inside each water pipe and the combustion is performed. In a multi-tube once-through boiler in which the combustion gas from the chamber is supplied to the outside of multiple water pipes to heat and evaporate the boiler water in the water pipes and the consumed steam is taken out.
Using recycled oil as fuel,
A door (cover 22) is formed on one end side facing the combustion chamber (9), and a burner (10) for supplying combustion gas to the combustion chamber (9) is installed on the outer surface of the door (cover 22). death,
The combustion chamber (9) has a cylindrical shape extending in the horizontal direction.
Each water pipe has an arc shape arranged on the left and right sides of the combustion chamber (9).
The water pipe row arranged on the left side of the combustion chamber (9) is connected by a linear left upper pipe alignment (1L) provided at the upper end and a linear left lower pipe alignment (2L) provided at the lower end, respectively. death,
The water pipe row arranged on the right side of the combustion chamber (9) is connected by a linear right upper pipe alignment (1R) provided at the upper end and a linear right lower pipe alignment (1R) provided at the lower end, respectively. death,
The water pipe row is composed of an inner water pipe row (3) and an outer water pipe row (4), and each water pipe of the outer water pipe row (4) is arranged between each water pipe of the inner water pipe row (3), and is left and right. The water pipes constituting the inner water pipe row (3) are connected by the closing fins (8) , and the water pipes constituting the left and right outer water pipe rows (4) are connected by the closing fins (8) . ,
By installing a partition wall (30) near the end of the inner water pipe row (3) to which the combustion gas is injected to partition the combustion chamber (9), the combustion gas supplied to the partition wall (30). After the collision, all the gas flows backward and returns to the door (lid 22) side .
An inner smoke vent (5) is provided between the end water pipe of the inner water pipe row (3) on the door (lid 22) side of the combustion chamber (9) and the combustion chamber wall on the door (lid 22) side. It is characterized in that a notch (inner smoke vent 5A) is formed only in three closing fins (8) from the door (lid 22) side connecting the water pipes of the inner water pipe row (3). There is.

According to claim 2, both ends of each of the plurality of water pipes are communicated with each other to supply boiler water to each water pipe, while a combustion chamber is formed inside each water pipe, and the combustion gas from the combustion chamber is supplied to the plurality of water pipes. In a multi-tube once-through boiler that is supplied to the outside to heat and evaporate the boiler water in the water pipe and take out the consumed steam.
Using recycled oil as fuel,
A door (cover 22) is formed on one end side facing the combustion chamber (9), and a burner (10) for supplying combustion gas to the combustion chamber (9) is installed on the outer surface of the door (cover 22). death,
The combustion chamber (9) has a cylindrical shape extending in the horizontal direction.
Each water pipe has an arc shape arranged on the left and right sides of the combustion chamber (9).
The water pipe row arranged on the left side of the combustion chamber (9) is connected by a linear left upper pipe alignment (1L) provided at the upper end and a linear left lower pipe alignment (2L) provided at the lower end, respectively. death,
The water pipe row arranged on the right side of the combustion chamber (9) is connected by a linear right upper pipe alignment (1R) provided at the upper end and a linear right lower pipe alignment (1R) provided at the lower end, respectively. death,
The water pipe row is composed of an inner water pipe row (3) and an outer water pipe row (4), and each water pipe of the outer water pipe row (4) is arranged between each water pipe of the inner water pipe row (3), and is left and right. The water pipes constituting the inner water pipe row (3) are connected by the closing fins (8) , and the water pipes constituting the left and right outer water pipe rows (4) are connected by the closing fins (8) . ,
By installing a partition wall (30) near the end of the inner water pipe row (3) to which the combustion gas is injected to partition the combustion chamber (9), the combustion gas supplied to the partition wall (30). After the collision, all the gas flows backward and returns to the door (lid 22) side .
An inner smoke vent (5) is provided between the end water pipe of the inner water pipe row (3) on the door (lid 22) side of the combustion chamber (9) and the combustion chamber wall on the door (lid 22) side. It is characterized in that a notch (inner smoke vent 5B) is formed only in three closing fins (8) from the door (lid 22) side connecting the water pipes of the outer water pipe row (4). There is.

3. The third aspect of the present invention is the multi-tube once-through boiler according to the first or second aspect.
The notch area of each notch (inner smoke vent 5A or inner smoke vent 5B) formed only in the three closing fins (8) from the door side is the widest on the door (cover 22) side . It is characterized by being formed with three stages of openings.

A fourth aspect of the present invention is the multi-tube once-through boiler according to the first or second aspect.
The front surface of the left upper pipe (1L) and the right upper pipe (1R) on the door (cover 22) side, and the door (cover) of the left lower pipe (2L) and the right lower pipe (2R). 22) It is characterized in that a hole that can be opened and closed is formed on each front surface on the side.

5. The fifth aspect of the present invention is the multi-tube once-through boiler according to the fourth aspect.
The water pipe row group composed of the inner water pipe row (3) and the outer water pipe row (4) is arranged so that the door (cover 22) side is lower than the inner side of the combustion chamber (9). It is characterized by that.

According to claim 1, the combustion chamber (9) has a cylindrical shape extending in the horizontal direction, and a door (lid 22) is formed on one end side facing the combustion chamber (9), whereby a door (lid) is formed. The inside can be seen by opening and closing the body 22), and the combustion chamber (9) can be easily cleaned, so that waste oil can be used as combustion fuel.

According to claim 2, the opening / closing operation can be performed while the burner (10) is installed on the door (cover body 22).

According to claim 3, by arranging each water pipe of the outer water pipe row (4) between each water pipe of the inner water pipe row (3), a large number of water pipes can be compactly stored.

According to claim 4, by providing a hole (screw lid 25) that can be opened and closed in the upper pipes (1) and the lower pipes (2), it is possible to easily clean the inside of each water pipe with a liquid. Can be done.

According to claim 4, the angle makes it easier for the fluid to flow, and it is possible to prevent the liquid from remaining in each water pipe during cleaning.

It is a side explanatory view which shows the multi-tube type once-through boiler which concerns on one Embodiment of this invention. It is a front explanatory view which shows the multi-tube type once-through boiler which concerns on one Embodiment of this invention. It is a front explanatory view of the inner water pipe row and the outer water pipe row. It is a partial cross-sectional explanatory view which shows the connection structure of an upper pipe group, an inner water pipe, and an outer water pipe. It is a side explanatory view which shows the inner water pipe row and the outer water pipe. It is a plane explanatory view which shows an example of the flow passage of the combustion gas in the main body of a multi-tube type once-through boiler. It is a plane explanatory view which shows the other example of the flow passage of the combustion gas in the main body of a multi-tube type once-through boiler. It is a block diagram which shows the schematic structure of the conventional multi-tube type once-through boiler. FIG. 8 is an explanatory view of a cross section taken along the line AA of FIG.

An embodiment of the multi-tube once-through boiler of the present invention will be described with reference to the drawings.
1 and 2 show the appearance of a multi-tube once-through boiler, which is a door that opens and closes the front side of the main body 20 with respect to the hinge portion 21 mounted on the cylindrical main body 20 arranged sideways. The lid 22 is rotatably attached. A burner 10 is installed on the outer surface of the lid 22, and by supplying fuel to the burner 10 and burning it, combustion gas is generated in the combustion chamber 9 inside the main body 20.
The combustion gas generated in the combustion chamber 9 of the main body 20 heats a plurality of water pipes installed inside the main body 20 from the outside, and is carried out as combustion exhaust gas from the flue 12 provided above the main body 20.

Next, the internal structure of the main body 20 of the multi-tube once-through boiler will be described with reference to FIGS. 3 to 6.
A cylindrical combustion chamber 9 extending in the horizontal direction is formed in the center of the main body 20, and a plurality of arc-shaped water pipes are arranged so as to surround the periphery of the combustion chamber 9.
Of the plurality of arcuate water pipes, the water pipe group arranged on the left inner side of the combustion chamber 9 is the inner water pipe row 3L, and the upper ends are connected by a linear left upper pipe gathering 1L, and the lower ends are linear left side. Connect with 2L of lower pipe. Similarly, the water pipe group arranged on the right inner side of the combustion chamber 9 is the inner water pipe row 3R, each upper end is connected by a linear right upper pipe alignment 1R, and each lower end is connected by a linear right lower pipe alignment 2R. connect. Further, the water pipes constituting the left and right inner water pipe rows 3L and 3R are connected by the closing fins 8 .

On the outside of the inner water pipe row 3, water pipes arranged between the water pipes of the inner water pipe row 3 are arranged, and these water pipe groups form the outer water pipe row 4. The outer water pipe row 4 is arranged on the outside of the left and right inner water pipe rows 3, respectively. It is connected to the lower pipes 2L, each upper end of the right water pipe group is connected to the right upper pipes 1R, and each lower end is connected to the right lower pipes 2R. Further, the water pipes constituting the left and right outer water pipe rows 4 are connected by closing fins 8 as in the inner water pipe row 3.

On the combustion gas supply side (lid 22 side), an inner smoke vent 5 is formed between the inner side wall of the lid 22 and the end water pipe, and a closing fin connecting the water pipes of the inner water pipe row 3 is formed. A notch (inner smoke vent 5A) is formed in 8. That is, as shown in FIG. 6, notches (hatched portions) are formed for each of the three closing fins 8 from the lid 22 side. This notch is formed by a three-stage opening in which the notch area is widest on the lid 22 side. This is done by enlarging the notch at the position near the outlet of the combustion gas of the burner 10 (see FIG. 5) so that the combustion gas that collides with the partition wall 30 and flows back can easily return to the vicinity of the lid 22 side. ing.

Further, the combustion chamber 9 is partitioned by installing a partition wall 30 made of heat-resistant stainless steel having a thickness near the end of the inner water pipe row 3 where the combustion gas is injected inside the main body 20, and the burner is used. The combustion gas injected from No. 10 is configured to flow back after colliding with the partition wall 30.

A water supply port 23 is provided on the lower surfaces of the left lower pipe gathering 2L and the right lower pipe gathering 2R, respectively, and a steam discharge port 24 is provided on the upper surfaces of the left upper pipe gathering 1L and the right upper pipe gathering 1R, respectively.
Further, the water pipe row group composed of the inner water pipe row 3 (left inner water pipe row 3L and right inner water pipe row 3R) and the outer water pipe row 4 (left outer water pipe row 4L and right outer water pipe row 4R) is relative to the back side. The lid (door) 22 side is inclined and arranged in the main body 20 so as to be in a low position. The inclination angle is preferably, for example, about 5 degrees.

A screw lid 25 is attached to the lid (door) 22 side of the upper pipes 1L and 1R and the lower pipes 2L and 2R, respectively. By removing the screw lid 25, a hole can be opened in the upper pipe and the lower pipe.
Then, by supplying water for cleaning from the holes on the 1L and 1R sides of the upper pipes and discharging it from the holes on the 2L and 2R sides of the lower pipes, it is possible to clean the inside of each water pipe. At this time, since the lid 22 side is arranged at a position lower than the back side, the water for cleaning the inside of the water pipe can be easily discharged from the holes on the lower pipe approaching 2L and 2R sides.
The peripheral portions of the upper pipes 1L and 1R and the lower pipes 2L and 2R are covered with the refractory material 13, and the entire combustion cylinder is covered with the heat insulating material 14 (FIG. 6).

According to the above-mentioned structure, when water is supplied from each of the water supply ports 23 of the left lower pipe gathering 2L and the right lower pipe gathering 2R, the boiler water is supplied to each of the plurality of water pipes arranged in an arc shape, and the boiler 10 is supplied. When the combustion gas is supplied to the combustion chamber 9, the combustion gas from the combustion chamber 9 comes into contact with the inner surface (the surface on the combustion chamber 9 side) of each water pipe of the inner water pipe row 3 to heat the boiler water in the water pipe.
The combustion gas is returned to the rebound lid 22 side by the partition wall 30 installed at the end of the combustion chamber 9, and as shown in FIG. 6, the inner smoke vent 5 and the notch (inner smoke vent 5A) are returned. Is guided to the combustion gas passage 7A between the inner water pipe row 3 and the outer water pipe row 4 and contacts the inner side surface of the inner water pipe row 3 and the inner side surface of the outer water pipe row 4 to heat the boiler water in the water pipe.
The boiler water in the water pipes of the inner water pipe row 3 and the outer water pipe row 4 is heated to become steam, which is taken out from the steam discharge port 24 provided in the left upper pipe gathering 1L and the right upper pipe gathering 1R and consumed at the desired supply location. To.
The temperature of the combustion gas drops by heating the boiler water in the water pipe, and the combustion gas is discharged to the outside from the flue 12.

According to the structure of the multi-tube once-through boiler having the above-mentioned structure, it is possible to use waste oil as the combustion fuel of the burner 10.
That is, by forming the combustion chamber 9 into a cylindrical shape extending in the horizontal direction, the lid (door) 22 can be formed on one end side facing the combustion chamber 9, so that the lid (door) 22 can be opened and closed. The operation makes it possible to open the inside of the combustion chamber 9.
Therefore, even when the combustion chamber 9 is contaminated with impurities by using the waste oil as the fuel for the combustion gas, the inside can be easily cleaned from the side by opening the waste oil to remove the impurities.

FIG. 7 shows another embodiment of the multi-tube once-through boiler, and is an example in which the formation position of the notch portion to be the inner smoke vent is different from that of FIG. That is, in the multi-tube once-through boiler of FIG. 7, each water pipe of the inner water pipe row 3 and the outer water pipe row 4 is connected by the closing fin 8, but the combustion gas supply side (cover body 22) of the outer water pipe row 4 is connected. Notches (inner smoke vents 5B) are formed in the closing fins 8 at three locations on both sides of the side). Other configurations are the same as those of the multi-tube once-through boiler of FIGS. 3 to 6.

With this configuration, the combustion gas injected from the burner 10 into the combustion chamber 9 and rebounded by the partition wall 30 at the end and returned to the lid 22 side is transferred from the inner smoke vent 5 to the inner water pipe row as shown in FIG. It is guided to the combustion gas passage 7A between the outer water pipe rows and also to the combustion gas passage 7B between the outer water pipe row 4 and the outer wall (boiler outer wall) of the outer water pipe row 4 and the main body 20 from the notch (inner smoke vent 5B). The boiler water in the water pipe is heated by contacting the outer surfaces on both sides of each water pipe in the outer water pipe row 4. Therefore, since the contact area to be heated by the combustion gas is increased for each water pipe in the outer water pipe row, each water pipe in the outer water pipe row 4 can be efficiently heated.

1 ... Upper pipe alignment 2 ... Lower pipe alignment 3,3L, 3R ... Inner water pipe row 4,4L, 4R ... Outer water pipe row 5,5A, 5B ... Inner smoke outlet 6 ... Outer smoke outlet 7,7A, 7B ... Combustion gas passage 8 ... Closing fin 9 ... Combustion chamber 10 ... Burner 12 ... Smoke path 13 ... Fireproof material 14 ... Insulation material 20 ... Main body 21 ... Hinge part 22 ... Lid (door)
23 ... Water supply port 24 ... Steam discharge port 25 ... Screw lid 30 ... Section wall

Claims (5)

Boiler water is supplied to each water pipe by communicating both ends of each of the plurality of water pipes, while a combustion chamber is formed inside each water pipe and the combustion gas from the combustion chamber is supplied to the outside of the plurality of water pipes. In a multi-tube once-through boiler in which the boiler water in the water pipe is heated and evaporated to take out the consumed steam.
Using recycled oil as fuel,
A door is formed on one end side facing the combustion chamber, and a burner for supplying combustion gas to the combustion chamber is installed on the outer surface of the door.
The combustion chamber has a cylindrical shape extending in the horizontal direction.
Each water pipe has an arc shape arranged on the left and right sides of the combustion chamber.
The water pipes arranged on the left side of the combustion chamber are connected to each other by the linear left upper pipes provided at the upper end and the linear left lower pipes provided at the lower end.
The water pipes arranged on the right side of the combustion chamber are connected to each other by the linear right upper pipes provided at the upper end and the straight right lower pipes provided at the lower end.
The water pipe row is composed of an inner water pipe row and an outer water pipe row, and each water pipe of the outer water pipe row is arranged between each water pipe of the inner water pipe row and between each water pipe constituting the left and right inner water pipe rows. Connect with closing fins , and connect between the water pipes that make up the left and right outer water pipe rows with closing fins .
By installing a partition wall near the end of the inner water pipe row at the injection destination of the combustion gas to partition the combustion chamber, all the supplied combustion gas collides with the partition wall and then flows back to the door side. With the composition
An inner smoke vent is formed between the end water pipe of the inner water pipe row on the door side of the combustion chamber and the combustion chamber wall on the door side, and three closures from the door side connecting the water pipes of the inner water pipe row. A multi-tube once-through boiler characterized by forming a notch only in the fins. Boiler water is supplied to each water pipe by communicating both ends of each of the plurality of water pipes, while a combustion chamber is formed inside each water pipe and the combustion gas from the combustion chamber is supplied to the outside of the plurality of water pipes. In a multi-tube once-through boiler in which the boiler water in the water pipe is heated and evaporated to take out the consumed steam.
Using recycled oil as fuel,
A door is formed on one end side facing the combustion chamber, and a burner for supplying combustion gas to the combustion chamber is installed on the outer surface of the door.
The combustion chamber has a cylindrical shape extending in the horizontal direction.
Each water pipe has an arc shape arranged on the left and right sides of the combustion chamber.
The water pipes arranged on the left side of the combustion chamber are connected to each other by the linear left upper pipes provided at the upper end and the linear left lower pipes provided at the lower end.
The water pipes arranged on the right side of the combustion chamber are connected to each other by the linear right upper pipes provided at the upper end and the straight right lower pipes provided at the lower end.
The water pipe row is composed of an inner water pipe row and an outer water pipe row, and each water pipe of the outer water pipe row is arranged between each water pipe of the inner water pipe row and between each water pipe constituting the left and right inner water pipe rows. Connect with closing fins , and connect between the water pipes that make up the left and right outer water pipe rows with closing fins .
By installing a partition wall near the end of the inner water pipe row at the injection destination of the combustion gas to partition the combustion chamber, all the supplied combustion gas collides with the partition wall and then flows back to the door side. With the composition
An inner smoke vent is formed between the end water pipe of the inner water pipe row on the door side of the combustion chamber and the combustion chamber wall on the door side, and three closures from the door side connecting the water pipes of the outer water pipe row. A multi-tube once-through boiler characterized by forming a notch only in the fins. The multi-tube once-through boiler according to claim 1 or 2, wherein the notch area of each notch formed only in the three closing fins from the door side is formed by a three-stage opening in which the door side is the widest. .. Claim 1 or claim 1 in which an openable / closable hole is formed on each front surface of the left upper pipe and right upper pipes on the door side, and on each front of the left lower pipe and right lower pipes on the door side. The multi-tube once-through boiler according to 2 . The multi-tube once-through boiler according to claim 4, wherein the water pipe row group composed of the inner water pipe row and the outer water pipe row is arranged so that the door side is at a lower position with respect to the inner side of the combustion chamber.

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