JPH04187901A - Uf type boiler - Google Patents

Abstract

PURPOSE:To provide easiness in the assembly by forming the group of evaporation pipes as a block in the group of flag type pipes and constructing partition walls for forming a deflected combustion gas route by placing a refractory on the flag type faces in a boiler with a U-type membrane wall. CONSTITUTION:The combustion gas goes through a group 12 of evaporation pipes consisting of bare pipes because of its temperature in the range of temperature higher than that of a fire furnace 9, and flows from the left to the right and, then, reverses to go through a group 13 of evaporation pipes, and reverses again to go through an economizer 14 and flows to the right and is discharged from the chimney. The combustion gas route is constituted of respective partition walls, 12a, 13a, 14a. The first partition wall 12a that forms the first combustion route is a membrane wall of flag type that connects the upper side header 12u and the lower side header 12d with a water tube 12c, and the membrane wall is constructed with a refractory. Those pipe walls can adopt as it is the standard membrane wall of flag type that forms the group 12 of evaporation pipes. The flag type group of evaporation pipes means a plate shaped panel of evaporation pipes connecting the upper and lower headers that are parallel.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention provides a boiler structure that is easy to assemble, compact, easy to transport and install, has a small installation surface, easily increases the amount of evaporation, and is suitable for updating existing boilers. It provides:

The furnace is connected with a large number of evaporation tubes, and the cross section of the furnace is approximately square. For this reason, a large number of holes must be machined on the upper and lower sides according to the number of evaporator tubes, and there is also the problem of combustion gas leaking from the corners of the rectangle. When changing the depth and width, it is necessary to change the evaporating water pipe and the drum, which is not preferable because it increases the number of steps required. In view of the latter problem and ease of processing, the inventors first proposed the structure of a U-type furnace boiler (
% Application No. 2-97538). However, from the viewpoint of ease of processing, assembly, and transportation, it is not necessarily satisfactory, and further improvements are required.

<Problems to be solved by the invention> The problems to be solved by this invention are as follows: (1) Drum perforation reduces the number of drum holes to reduce machining, standardizes parts to facilitate assembly, and improves the number of constituent parts. (2) The width, depth, etc. of the furnace can be easily changed depending on the characteristics of the fuel and burner, regardless of the evaporator tube group.

<Example 1> The structure of a boiler of a first example will be explained with reference to FIGS. 1 and 2. The main body of the boiler 1 includes an upper shell 2, a lower shell 3, and a U-shaped membrane wall 4 in which upper and lower 8-shaped headers are connected by water pipes. , the combustion air is sent from the air blower tIIA5 to the duct 6.
, and is used to burn fuel that is sent to the wind box 7 and sprayed into the furnace from the burner 8. Reference numeral 10 is an ignition burner, reference numeral 11
is an air boat for NOx adjustment as a pollution control measure. As shown by the arrow, the combustion gas is in a higher temperature range than the furnace 9, so the evaporator tube group 12, which is a bare tube, is energized, flows from the left to the right in FIG. It flows through the evaporator tube group 13, reverses itself again, passes through the economizer 14, flows to the right, and is discharged from the chimney. The second evaporator tube group and the water tubes of the economizer have a finned tube structure for medium and low temperature ranges, and are designed to be compact and to obtain effective heat absorption.

The combustion gas passage is partitioned by partition walls 12a, 13a, and 14a, respectively. The first partition wall 12& forming the first combustion gas passage is shown in FIG. The partition wall 12flL is constructed of a flag-type membrane wall made of fireproof material and has an upper header 12u and a lower header 12d connected by a water pipe 12c. As this tube wall, the standard flag type membrane wall forming the evaporator tube group 12 can be used as is.

Here, the so-called flag-type evaporator tube group refers to a plate-shaped panel in which parallel upper and lower henders are connected by a plurality of evaporator tubes.

In addition, the tube in the high temperature section is a so-called bare tube without fins, and the evaporator tube and economizer tube in the medium temperature region are finned tubes or spiral finned tubes. The pinch of the fins and the height of the fins from the tube surface are appropriately selected depending on the temperature of the combustion gas passing through, and two or more types of tube groups are provided to increase heat transfer efficiency.

The heat exchanger tubes may be arranged in a staggered manner with respect to the gas flow.

For the header of each flag type evaporator tube group, see Figure 42.
As shown in a perspective view in FIG. 5, the upper header 12u and the lower header 12d are formed into the stands of the upper body 2 and the lower body 3, respectively. If necessary, it may be formed into a two-heat-transfer-surface type in which heat-transfer surfaces are formed parallel to each other in a row on the left and right about the axis of the header. [Figure 3
(See (B))] In this case, an automatic pipe beveling device or an automatic local welding device for pipes can be used for connection welding between the stub and the header, and between the pipe and the header.

It is constructed so that it can be taken out of the furnace.

As for the ceiling pipe 15, a plurality of single pipes may be connected between opposing parts of the upper header of the furnace as shown in Figure ^. The furnace bottom tube has a similar structure.

Figure 6 shows a partition wall 12a1, Figure 7 shows a group of flag-type heat transfer tubes for high-temperature gas, Figure 8 shows a partition wall 13a1, Figure 9 shows a group of flag-type heat transfer tubes for a medium temperature section, and Figure 10 shows an energy saver. be.

As shown in FIG. 3A, a conical cyclone baffle 16 can be provided inside the upper drum, corresponding to the stamp hole into which the air/water temperature mixture flows. Alternatively, a known panful plate having a key-shaped cross section extending in the direction of the drum axis may be used. -<Embodiment 2> The axis of the lower body can also be eccentrically outward by about 150 mm from a vertical plane including the axis. This makes it possible to add two shift flag type heat transfer tubes and to keep the legs of the upper body support fitting within the limits of the vehicle.

<Example 3> FIG. 3 is a schematic plan view of the device when

<Example 4> FIGS. 12(0) and 12(D) are schematic plan views when the burner axis is parallel to the drum axis.

<Example 5> FIG. 13(A) is a side sectional view of a so-called two-tiered UF boiler in which the ceiling of the combustion chamber 18 is the bottom of the combustion gas passage where the evaporation group is located, and FIG. 13(B) FIG. 2 is a cross-sectional view taken along line II in FIG.

<Embodiment 6> FIG. 14 is a schematic plan view when an incinerator 2o for incinerating waste etc. is used as a combustion chamber.

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

This resulted in a significant reduction in price.

transport became possible.

(4) It has become easier to enter the furnace through a door (not shown) provided on the side wall or the like to inspect the evaporation tube group or replace the tubes.

(5) The use of finned heat transfer tubes significantly improves heat transfer efficiency, resulting in a compact structure, and the installation area can be reduced by approximately 40% compared to existing boilers.

(6) Since a flag-type standard evaporation tube group is adopted, the boiler structure can easily accommodate an increase in the amount of evaporation.

(7) The membrane wall of the U-shaped furnace eliminates the risk of gas leakage.

(8) Depending on the characteristics of the fuel burner, it is now possible to easily and significantly change the furnace to a separate furnace regardless of the evaporator tube group.

[Brief explanation of the drawing]

FIG. 1 is a side view of the boiler of Example 1, FIG. 2 is a plan view thereof,
FIG. 3(A) is a perspective view of a conical cyclone steam/water separator;
Figure 3 (B) is a cross-sectional view of a flag-type heat exchanger tube group in which two rows (two sides) of evaporator tube groups are provided on one header, and Figure 4 is a section of the flag-type heat exchanger tube group in the high temperature section. 5 is a partial perspective view of a group of flag-type heat exchanger tubes made of finned tubes in a medium temperature section, FIG. 6 is a front view of the partition wall 12a, and FIG. 7 is a front view of a group of flag-type heat exchanger tubes in a high temperature section. FIG. 8 shows the partition wall 13a
Figure 9 is a front view of a flag-type heat transfer tube group using finned tubes for medium temperature sections, Figure 10 is a front view of a energy economizer, and Figure 11 is a front view of a fuel economizer that can increase capacity according to the range of freight car transportation. Figure 1 is a cross-sectional view of the upper body located slightly to the right of the drawing.
2 (A) and (B) are schematic plan views of a furnace arrangement in which the burner axis is perpendicular to the drum axis, and (0) and (D) are schematic plan views of a furnace arrangement in which the burner axis is parallel to the drum axis. A schematic plan view, FIG. 13(A) is a side view when the furnace and evaporation tube group are stacked in two stages, and FIG. 13(B) is a cross-sectional view taken along line II in FIG.
15 is a plan view of a boiler with an incinerator, and FIG. 15 is a side view of a conventional boiler. 1...Boiler 2...Top Body 3...Bottom Body 4...U-shaped membrane panel 8...
Burner 9... Fire Furnace 11... Airport 12... Evaporation tube group 13... Evaporation tube group 14... Energy saver 15. ...Ceiling pipe 16...--Cyclone type baffle 2θ...
・Incinerator Fig. 2 Fig. 8 Fig. 10 Fig. 9 Fig. 11 Fig. r Fig. 13 (B) Fig. 14 Furnace Figure 15

Claims (1)

[Claims] 1. In a boiler having a U-shaped membrane wall, the evaporator tube group is formed into one block of the flag-type tube group, and the partition wall forming the bent combustion gas passage has a refractory material on one flag-type surface. A UF boiler characterized by being equipped with. 2. The UF boiler according to claim 1, wherein the flag type tubes are formed and arranged so that the evaporator tube group is arranged in a staggered manner in the cross section. 3. The UF boiler according to claim 1 or 2, wherein the burner axis is arranged parallel to the drum axis. 4. The UF boiler according to claim 1 or 2, wherein the burner axis is orthogonal to the drum axis. 5. Claim 1 or 2 in which the combustion chamber is an incinerator for waste, etc.
UF type boiler described. 6. The UF boiler according to claim 1, 2 or 5, wherein the combustion chambers are provided on the left and right sides of the drum axis when viewed from a plan view.