JPH04101A - U-shaped furnace boiler - Google Patents

Abstract

PURPOSE:To obtain a boiler having no corner due to surface connection of which manufacturing can be easily performed, having a sufficient efficiency of thermal conduction, no accident of gas leakage and the capacity thereof is varied by varying the length of the side wall of a furnace rather than varying the drum size by a method wherein a U-shaped upper header and a U-shaped lower header comprising an arcular part and a straight part are connected by a plurality of water pipes so as to form a U-shaped furnace. CONSTITUTION:U-shaped realized headers 3 and 4 are comprised of an arcular part 13 and two straight line parts 14 and they can easily be formed by heating and bending one steel pipe. Due to this shape, no corner having surfaces crossed at a right angle is generated, so that a gas leakage is not generated from the corner part and its machining may easily be carried out. A front wall 6 having a fuel supplying means is connected to an opening of a furnace 15. Combustion gas passes through smoke tubes 16 of a smoke tube boiler, absorbs heat effectively with the smoke tubes, then passes through a gas discharging duct 17 and is discharged. The boiler manufactured at a factory can be divided into a smoke tube boiler, a U-shaped furnace and a front wall and transported. A small-sized boiler can be transported as an assembled boiler and can reduce a period required for performing an installation at site. The water pipe wall at a rear part of the furnace is enclosed by a plate- like covering 22a to form the third air chamber 22 and the third air is supplied from a nozzle 23.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention provides a boiler structure that is easy to assemble, easy to design and produce a boiler corresponding to the capacity, and easy to maintain and handle.

<Conventional technology and its problems> Conventional small low-pressure boilers include smoke tube boilers, vertical boilers with spiral evaporation tubes, and water tube boilers in which a furnace is formed by a series of ceiling tubes, front wall tubes, and floor tubes. However, the diameter and length of the boiler drum were determined according to the amount of evaporation, and there was the inconvenience that the design and manufacturing had to be made for each different amount of evaporation and pressure.

Further, there are various difficulties in creating an airtight structure to prevent gas leakage at the corners connecting the bent pipe surface and the left and right side wall surfaces. This is because when the wall forming the furnace starts operating, it undergoes complicated movement and deformation due to the radiation of heated boiler water and flame inside, causing cracks. Corner part (marked a99b in Figures 16 and 17,
One of the reasons is the existence of There is also the problem that the corner portion absorbs little heat and does not function effectively as a heat transfer surface.

<Purpose of the Invention> This invention does not change the dimensions of the drum when changing the capacity, but by changing the length of the side wall of the furnace wall, requires fewer processing steps, can be divided for easy transportation, and can be easily and effectively assembled on-site. U has a furnace with a U-shaped header that allows for good heat transfer.
To provide the structure of type furnace boiler.

Summary of the means for achieving this> In short, the present invention connects a U-shaped upper header and a lower header consisting of an arcuate part and a straight part with a plurality of wood pipes to form a U-shaped furnace, and has a U-shaped furnace with a fuel supply means attached to the U-shaped opening. A connecting piece that connects the front wall, surrounds the rear water pipe wall for the gas flow of the U-shaped furnace, provides a tertiary air supply chamber, and interconnects the water pipes forming the enclosed water pipe wall. The present invention discloses a structure of a U-shaped furnace boiler in which a plurality of nozzles for supplying tertiary air are provided in each of the U-shaped furnaces, and a smoke tube type boiler drum is provided in the upper part of the U-shaped furnace.

<Example 1> Figures 1 to 3 show the first embodiment of the present invention, in which Figure 1 is a side view of a partially cutaway, Figure 2 is a cross-sectional view of the FIG. 3 is a sectional view taken along line B--B in FIG. 1. code 1
is a smoke tube boiler, 2 is a torch furnace wall, 3 is a U-shaped upper header,
4 is a lower header, 5 is a plurality of water pipes that make up the furnace wall, 6 is
7 is a front wall, 7 is a stoker, 8 is a downcomer, 9 is a fuel supply means, and 10.11 is an ascender. The fuel supply means is shown in Figure 4.
As shown in FIG. 5, a burner structure for burning liquid fuel can be provided.

The U-shaped upper and lower headers 3 and 4 have arcuate parts 1 as shown in FIG.
3 and two straight portions 14 and 91 straight steel pipes can be easily formed by heat bending or the like. By forming the structure in this way, there will be no corners where the surfaces are perpendicular to each other, so that the processing can be facilitated without causing gas leakage from the corners as described above. U-shaped opening of U-shaped header (opening of furnace 15)
A front wall 6 with fuel supply means is connected to. The combustion gas passes through the smoke tube 16 of the fire tube boiler, where it effectively absorbs heat, and is then discharged through the gas outlet duct 17. Factory-manufactured boilers can be shipped separately into smoke tube boilers, U-shaped furnaces, and front walls. Small-sized boilers can be shipped as fully assembled boilers, significantly reducing the time required for on-site installation.

Further, as a means for supplying tertiary air, a plate-shaped cover shown by the reference numeral 1 in FIG. 6 surrounds the wall of the water tube at the rear of the furnace to form a tertiary air chamber 22, and tertiary air is supplied from a nozzle 23. The water pipe wall covered with this plate-like cover is provided with connection pieces 24 for connecting the wood pipes to each other as shown in FIG. 7, and each of these connection pieces is provided with a plurality of nozzles 25 as shown. Tertiary air is supplied through this nozzle 25. The combustion gas flows along the arcuate surface at the rear of the furnace and mixes well with the tertiary air, and the unburned gas burns and rises and reverses, flowing into the smoke tube 16 of the smoke tube boiler from the left side of Figure 1 and heating the boiler water in the can. It then flows from the outlet duct 17 to the chimney.

<Embodiment 2> The front wall 6 with fuel supply means has a structure of a refractory wall with a steel frame as shown in FIG. Although the water pipe wall can be installed to close the opening of the U-shaped furnace, it is preferable to provide a metal fitting 21 (FIGS. 5 and 17) to prevent gas leakage from the furnace. The inspection nipple shown by reference numeral 2o in FIG. 5 is used for inspecting the inside of the header by cutting off its end during periodic inspections.

In addition, if the pressure is relatively low, you can replace the inspection nipple with a 7-lunge type as shown in the figure, and eliminate the work of cutting the nipple and blind cover welding every time you inspect, and doing the work of removing the 7-lunge bolt, which saves time. It can be shortened. During inspection and cleaning, a fiberscope electric wire brush can be easily inserted through this inspection nipple.

Embodiment 3 The water tube wall surrounding the furnace can be formed of a membrane panel, and the front wall can also be formed of a membrane panel as shown in FIG. Similarly, the tertiary air nozzle has a connecting piece (
rug).

FIG. 6 shows a state in which a tertiary air chamber 22 is provided in the rear arc of the furnace, and FIG. 7 shows a partial cross-sectional view of the tertiary air chamber 22. The water pipes are fillet welded from the furnace side to a connecting plate 24 to form a membrane, which is surrounded by a plate-shaped cover 22a spaced apart from the membrane surface to form a tertiary air chamber 22. A plurality of nozzles 25 are provided on the connecting plate 24 at the positions of the membrane panels in the arcuate portion, taking into consideration the number of holes and the pitch (the nozzle density on the panel surface) so that after-combustion can be performed appropriately.

Note that using triangular fillet welding as shown in the figure prevents distortion and deformation of the membrane panel surface. In addition, if necessary, when the connecting plate is provided so as to be located within a virtual plane that includes the fine points of the water pipes, the effect of preventing deformation of the panel due to welding distortion can be achieved6. FIG. 9 is a side view of the device showing the embodiment, and is a sectional view taken along line C-a in FIG. 8. This device has means for switching the flow path of combustion gas under low load. The damper 26 on the front wall side is closed during normal operation, the damper 27 at the rear of the furnace is open, and the combustion gas is reversed from the rear wall side of the furnace and enters the smoke pipe from the front wall side of the fire tube boiler/sent out from the flO duct 17. It is something that will be done.

When the load is low, the damper 27 is closed to reduce the gas flow to the rear of the furnace and reduce the amount of heat transferred from the furnace wall.Since the damper 26 on the front wall side is open, the combustion gas flows through the opening where the damper 26 is located to the υ smoke tube boiler. Inflow. This allows low load operation. The dampers 26 and 27 are driven by an air cylinder (not shown).

<Embodiment 5> Figures 10, 11, and 12 show the device of the fifth embodiment, where Figure 10 is a side view and Figure 11 is a side view of Figure 10.
-D observation, Fig. 12 is the grandfather of E- in Fig. 10. In this embodiment, a steam-water separator 28 is provided in place of the smoke tube boiler, and a downcomer pipe 30 is connected to the lower header, and a riser pipe 31 is connected to the upper header, and combustion gas is sent from the furnace ceiling to the chimney through an outlet duct 29. ing. With this structure, equipment costs can be reduced by using a simple steam-water separator instead of a smoke tube boiler. When used as a garbage incinerator, it can also be used as a hot water generator if the customer does not need steam.

<Embodiment 6> Fig. 13 and Fig. 14 are drawings of the device showing the sixth embodiment, Fig. 13 is a partially cutaway side view, and Fig. 14 is a view taken from F-F in Fig. 13.
He is my grandfather. The combustion gas flows from the drum rear partition chamber 32 to the drum front reverse flow chamber 33 as shown by the arrow, through the lower half pipe group 34, which is about half of the smoke pipe group, and then reverses and flows through the upper half smoke pipe group 35 to the outlet. It flows into duct 36. As a result, since the temperature of the boiler water in the can is higher in the lower half than in the upper half, the circulation of the can water can be improved and the heat transfer effect in the smoke tube boiler can be enhanced.

Effect By implementing this invention, the following effects can be obtained.

(1) Since the header is U-shaped, there is no corner part due to surface connection, making it easy to manufacture, efficient heat transfer, effective heat absorption, and no gas leakage accidents.

(2) There is an invection nipple (including 7 runci type) at the end of the header, making it easy to inspect and clean the inside of the U-shaped header. The inspection nipple of the header on the front wall can be constructed easily as shown in FIG. 15 to facilitate assembly of the front wall.

(3) The tertiary air chamber and nozzle are located at the rear of the furnace, allowing for good combustion and increasing combustion efficiency.

(4) Ordinary U-shaped furnace (shown in Figures 16 and 17) (
Water pipes can be designed and manufactured in a figure-9 shape with one pipe for the ceiling, sides, and floor. Therefore, according to the present invention, a vertical furnace,
You can freely choose a horizontal furnace.

(5) The evaporator is a smoke pipe and is easy to maintain.

(6) In the present invention, only a part of the rear part of the water pipe wall can be made into a membrane structure, or if necessary, the whole water pipe wall can be made into a membrane structure.

(7) A U-shaped furnace similar to a smoke tube boiler can also be used.

(8) The U-shaped furnace can support the drum and does not require a drum stand.

(9) Incinerator boiler (Fluidized bed furnace as a vertical furnace including fixed bed, stoker-fired, and pressurized types) Can be used as is in general heavy oil, gas, and stoker-fired boilers.

(10) The drum can have a vertical structure.

(11) When used as an incinerator for general waste or factory waste to incinerate materials with a high ash content, the furnace should be configured as a horizontal furnace with a short water pipe length, and incinerate polymeric materials with a low ash content. The furnace is configured as a tall vertical furnace, allowing for flexible design and suitable incineration.

[Brief explanation of drawings]

1 is a partially cutaway side view of the first embodiment of the present invention, FIG. 2 is a sectional view taken along line AA in FIG. 1, and FIG. 3 is a sectional view taken along line B-- in FIG.
Bli side view observation Figure 4 is a perspective view of the front wall with a liquid fuel burner, Figure 5 is a partial view showing the connection between the front wall of Figure 4 and the header of the U-shaped furnace, and Figure 6 is FIG. 7 is a partially cutaway enlarged view showing the connection plate 24 and nozzle 25, FIG. 8 is a side view of the device showing the combustion gas flow path switching damper, and FIG. 9 is a plan view showing the tertiary air chamber. Fig. 10 is a side view of the device with air/moisture 11W, Fig. 11 is a visual observation taken along DD in Fig. 10, Fig. 12 is an observation taken along E- in Fig. 10, 1st
Figure 3 is a side view of a device in which combustion gas is diverted in a fire tube boiler, Figure 14 is a cross-sectional view taken along line FF in Figure 13, and Figure 15 is an inspection view of the end of the header on the front wall. FIG. 16 is a side sectional view of a water tube boiler with a conventional D-type furnace, and FIG. 17 is a cross sectional view thereof. 1...Fire tube boiler 2...U torch furnace wall 3...Upper header 4...Lower header 5...Water pipe 6... ...Front Wall 7...Stoker 8...Descent pipe 9...Fuel supply device 10...Rising pipe 11...Rising Pipe 12... Burner 22... Tertiary air chamber 24... Connection plate 25... Nozzle 26.27... Damper 28... ... Steam separator 29 ... Outlet duct 32 ... Drum rear partition chamber 33 ... All reverse flow chambers Figure 6 Figure 7 Figure 22a @ Figure 2 Figure 8 Figure 9

Claims (1)

[Claims] 1. A U-shaped furnace is formed by connecting a U-shaped upper header and a lower header consisting of an arcuate part and a straight part with a plurality of water pipes, and a front wall with a fuel supply means in the U-shaped opening. A tertiary air supply chamber is provided surrounding the rear water pipe wall for the gas flow of the U-shaped furnace, and a plurality of connecting pieces are provided for interconnecting the water pipes constituting the enclosed water pipe wall. The U-type furnace is equipped with a nozzle for supplying tertiary air, and a smoke tube boiler drum is installed on the upper part of the U-type furnace.
type furnace boiler. 2. The U-type furnace boiler according to claim 1, wherein the U-type furnace water tube wall is formed into a membrane wall. 3. The U-type furnace boiler according to claim 1 or 2, further comprising a drum having a steam/water separation means in place of the smoke tube type boiler drum, and a gas outlet duct for delivering combustion gas from the upper part of the furnace. 4. A switching device according to claim 1 or 2, further comprising a switching means for forming a gas flow path in which the combustion gas rises from the front wall side and flows into the smoke tube of the smoke tube boiler drum at low load without reversely flowing from the rear wall side. U-type furnace boiler. 5. A reverse flow chamber at the front of the drum and a partition at the rear of the drum to form a group of smoke tubes in the smoke tube type boiler drum into a group of smoke tubes in which combustion gas flows in the front direction of the can and a group in which combustion gas flows in the rear direction of the can. The U-type furnace boiler according to claim 1 or 2, further comprising a chamber.