JPH0351601Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is an oil-fired boiler that burns fuel oil with a burner to create steam, and an exhaust gas boiler that creates steam by recovering the exhaust heat of exhaust gas from a diesel engine, etc. This invention relates to a composite boiler in which the boiler is integrated.

[Prior Art] Conventionally, as disclosed in Japanese Patent Publication No. 46-40041, the above-mentioned type of composite boiler has conventionally separated the steam and water mixture generated inside the boiler. A lower drum is placed at a predetermined distance below the upper drum that sends out steam, and both the upper and lower drums are connected by a cylindrical water tube wall to form a combustion gas flow path for the oil-fired boiler inside. There was one in which a large number of water tube groups were disposed within the combustion gas flow path, and an annular exhaust gas boiler portion was further formed outside the cylindrical water tube wall.

[Problems to be solved by the invention] However, the cylinder forming the combustion gas flow path of the oil-fired boiler of the conventional composite boiler has a large number of water pipes arranged in a cylindrical shape between the upper and lower drums,
The structure was complicated because it consisted of a water pipe wall in which these water pipes were connected by fins.

Further, in the conventional composite boiler described above, a downcomer must necessarily be provided between the upper and lower drums.

Furthermore, not only does the combustion gas flow path have a labyrinth structure in which buffer plates are arranged to cross a part of the flow path, but also a large number of water tube groups are arranged within the combustion gas flow path having the labyrinth structure. This extremely complicated structure requires the placement of gas-side heat transfer surfaces, which leads to the accumulation of soot and makes it difficult to clean the gas-side heat transfer surface.

This invention was devised to solve the above-mentioned conventional problems, and its objectives are to achieve good heat exchange efficiency, eliminate the downcomer pipe in the exhaust gas boiler, and have a simple structure. The object of the present invention is to provide a composite boiler with low manufacturing costs, low lining costs, etc.

[Means for Solving the Problems] The composite boiler of the present invention includes an upper drum that separates the steam and water mixture generated in the can and sends out steam; a lower drum arranged so as to maintain the combustion chamber of an oil-fired boiler inside; a cylinder arranged perpendicularly between the two drums and connected in communication with the two drums; a group of water tubes disposed on the outer annular portion of the cylinder and connected in a freely communicable manner within both drums; a casing for an exhaust gas boiler having an inlet and an outlet duct on opposing sides surrounding the group of water tubes; A plurality of smoke pipes are installed vertically on the top plate of the combustion chamber of the boiler, penetrate vertically through the cylinder, and have their upper ends opened above the upper drum; A stud tube that communicates with both drums;
The canned water around the smoke pipe and near the inner wall surface of the cylinder forms an upward flow air-water mixture part, and the canned water inside the cylinder other than the upward flow air-water mixture part forms a downward flow can water part. That is.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

In FIGS. 1 and 2, reference numeral 1 denotes an upper drum, which separates steam and water from the steam and water mixture generated within the can and sends out steam.

A lower drum 2 is arranged below the upper drum 1 at a predetermined interval. Upper drum 1
A tube sheet 1a is provided at the bottom of the drum 2, and a tube sheet 2a is provided at the top of the lower drum 2.

A cylinder 3 is arranged vertically between the upper and lower drums 1 and 2, and the upper end of the cylinder 3 is connected to the tube plate 1a, and the lower end of the cylinder 3 is connected to the tube plate 1a. 2a. Further, the connecting portion of the cylinder 3 is connected to the upper drum 1 and the lower drum 2.
The canned water in both drums 1 and 2 can freely flow through the cylinder 3.

Cylinder 3 sandwiched between upper drum 1 and lower drum 2
A large number of water pipes 4 are arranged in the annular part around the exhaust gas boiler, forming a water pipe group of the exhaust gas boiler, and the upper end of each water pipe 4 is attached to the tube plate 1a of the upper drum 1. Further, the lower end portion is attached to the tube plate 2a of the lower drum 2, and the lower end portion is attached to the tube plate 2a of the lower drum 2.
The air-water mixture inside can rise to the upper drum 1.

Reference numeral 5 denotes a downcomer pipe, and since its diameter is larger than that of the water pipe 4, the amount of heat absorbed by the canned water in the downcomer pipe is small, and the can water descends while remaining almost in the aqueous phase. Incidentally, in the present invention, the downcomer pipe 4 can be omitted.

A casing 6 is sheathed around the water tube group consisting of the large number of water tubes 4, and the inside thereof forms an annular exhaust gas boiler section, and an inlet duct 6a and an outlet duct for exhaust gas are located at opposite positions of the casing 6. A duct 6b is provided.

A combustion chamber 7 of an oil-fired boiler is disposed inside the lower drum 2, and fuel oil is combusted by a burner 7a. Three smoke pipes 8 are provided upright on the top end plate 7b of the combustion chamber 7. The upper part of the smoke pipe 8 passes vertically upward through the inside of the cylinder 3, and its upper end is attached to the top mirror plate 1b of the upper drum 1, and opens into the chimney 9.

Also, inside each smoke pipe 8 is a stud tube 1.
0 is built in and communicates with both the upper and lower drums 1 and 2. A large number of stud fins 10a are implanted on the outer surface of the stud tube 10.

Incidentally, the bottom of the combustion chamber 7 is constituted by a fireproof heat insulating layer 7c.

Next, the operation of the composite boiler of the above embodiment will be explained.

The combustion gas of the fuel oil combusted by the burner 7a transfers axial heat to the canned water in the lower drum 1 in the combustion chamber 7, and then is distributed to the three smoke pipes 8 and rises.

When the high-temperature combustion gas passes through the smoke pipe 8, the canned water around the smoke pipe 8 is heated and becomes a steam-water mixture, which flows upward.

When the canned water around the smoke tube 8 is heated, it moves upward toward the upper drum 1 without transmitting heat to the canned water outside. Therefore, among the canned water in the cylinder 3, the canned water that is far away from the surrounding area of the smoke pipe 8 is not subjected to the heating effect and is in the water phase state, so that the canned water becomes a downward flow. Move down towards the lower drum.

As described above, the combustion gas passing through the smoke pipe 8 while heating the canned water in the cylinder 3 reaches the chimney 9.

Further, a portion of the canned water in the lower drum 2 rises in the stud tube 10 and absorbs heat from the combustion gas in the smoke tube 8 to become a steam-water mixture, which flows out into the upper drum 1. Since the stud tube 10 is provided in this manner, the heat of the combustion gas in the smoke tube 8 is effectively used, and the number of smoke tubes can be reduced.

On the other hand, the exhaust gas from the diesel engine flows into the exhaust gas boiler section in the casing 7 from the inlet duct 6a, passes through a water tube group consisting of a large number of water tubes 4, heats the canned water in the water tubes 4, and then flows into the outlet duct 6b.
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The heated can water in the water can 4 becomes a steam-water mixture and moves upward toward the upper drum 1.

Further, the canned water inside the cylinder 3 is also heated by the exhaust gas, but since the temperature of the exhaust gas is not as high as the temperature of the combustion gas flowing inside the smoke pipe 8, only the canned water near the inner wall surface of the cylinder 3 is heated. The mixture becomes a mixture and flows upward.

[Effects of the invention] (1) Among the canned water in the cylinder, the canned water in the part that is away from the surrounding area of the smoke pipe and that is not near the inner wall surface of the cylinder is almost not subjected to the heating effect. There is no need to install any other downcomer pipes, as the water-phase remains in the downward flow.

(2) Since there is no need to provide a thick downcomer pipe inside the exhaust gas boiler, the entire interior of the exhaust gas boiler can be made into a group of water tubes for heat transfer.

(3) The structure of the combustion gas flow path is simple, so there is no soot buildup and the gas side heat transfer surface is easy to clean.

(4) Since the cylinder and its internal structure are very simple, it can be manufactured quickly and at low cost.

(5) Since the stud tube is installed inside the smoke pipe, not only can the heat of the combustion gas inside the smoke pipe be used effectively, but also the number of smoke pipes can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the composite boiler of the present invention, and FIG. 2 is a sectional view taken along line A--A in FIG. 1. 1... Upper drum, 1a... Tube plate, 1b... Top end plate, 2... Lower drum, 2a... Tube plate, 3...
... Cylinder, 4 ... Water tube, 5 ... Downpipe, 6 ... Casing, 6a ... Inlet duct, 6b ... Outlet duct, 7 ... Combustion chamber, 7a ... Burner, 7b ... Top end plate, 7c ... ...Fireproof insulation layer, 8... Smoke pipe, 9...
...Chimney, 10...Studded tube, 10a...
Studfin.

Claims (1)

[Scope of utility model registration request] An upper drum that separates the steam and water mixture generated in the can and sends out steam; a lower part that is placed below the upper drum at a predetermined interval and has a combustion chamber for an oil-fired boiler inside; a drum; a cylinder disposed perpendicularly between the two drums and connected so as to be freely communicable within both the drums; and a cylinder disposed in an annular portion outside the cylinder between the two drums so as to freely communicate within the both drums. A group of connected water tubes; A casing for an exhaust gas boiler having an inlet and an outlet duct on opposite sides surrounding the group of water tubes; A casing for an exhaust gas boiler that is erected on the top end plate of the combustion chamber of the oil-fired boiler, and consisting of a plurality of smoke tubes that penetrate vertically through the upper drum and whose upper ends open above the upper drum; and a stud tube that is built into the smoke tube and communicates with both the upper and lower drums; Of the canned water in the cylinder, the canned water around the smoke pipe and near the inner wall of the cylinder forms an upward flow air-water mixture part, and the canned water in the cylinder other than the upward flow air-water mixture part flows downward. A composite boiler characterized by a canned water section.