JP2850052B2 - UF type boiler - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial application field> The present invention provides a boiler structure suitable for easy assembling, compactness, easy installation for transportation, small installation surface, easy increase in evaporation, and renewal of existing boiler. It is.

<Conventional Technology> As shown in FIG. 15 (FIG. 15 is abbreviated as FIG. 15; the same applies hereinafter), a conventional boiler has an upper body and a lower body connected by a number of evaporating tubes, and the furnace cross section is substantially It is square. For this reason, a large number of holes must be machined and provided in the upper and lower body according to the number of evaporating tubes, there are problems of square corners, combustion gas leakage from the corners, and furthermore, furnace furnaces according to the characteristics of the fuel burner When the depth width or the like is changed, it is necessary to change the evaporating water pipe and the drum, and there is a problem that the number of operations is greatly increased, which is not preferable. From the viewpoint of the latter measure and ease of processing, the inventors first
Proposed the structure of a type furnace boiler (Japanese Patent Application No. 2-97538)
issue). However, from the viewpoint of easy processing, assembly and transportation,
It is not always satisfactory, and further improvement is being demanded.

<Problems to be Solved by the Invention> The problems to be solved by the present invention are as follows: (1) To reduce the number of drum holes to reduce the number of drum holes, to standardize members for easy assembly, and to make components. (2) The width, depth, etc. of the furnace can be easily changed according to the characteristics of the fuel and the burner irrespective of the evaporator tube group.

<Example 1> The structure of the boiler of the first example will be described with reference to Figs. The boiler 1 has a main body composed of an upper body 2, a lower body 3, and a U-shaped membrane wall 4 in which upper and lower U-shaped headers are connected by a water pipe. The combustion air is sent from the blower 5 to the duct 6 and the wind box 7, and is used for burning fuel sprayed from the burner 8 into the furnace. Reference numeral 10 is an ignition burner, and reference numeral 11 is an air port for pollution control NOx adjustment. The combustion gas is indicated by the arrow,
From the furnace 9, it flows through the evaporating tube group 12 consisting of bare tubes for a high temperature region, and flows perpendicularly to the drum axis from left to right in FIG.
Invert and flow through the second evaporator tube group 13 and again invert to save economizer 14
Flows to the right and is discharged from the chimney. The second evaporating pipe group and the water pipe of the economizer have a pipe structure with a line for the middle and low temperature range, so that a compact and effective heat absorption is obtained.

The combustion gas passage is partitioned by the respective partition walls 12a, 13a, 14a. A first combustion gas passage forming a first combustion gas passage;
FIG. 6 shows the partition wall 12a. The partition wall 12a is constructed by constructing a refractory material with a flag type membrane wall in which an upper header 12u and a lower header 12d are connected by a water pipe 12c. As this tube wall, a standard type flag type membrane wall forming the evaporating tube group 12 can be employed as it is. Here, the so-called flag type evaporation tube group refers to a plate-like panel (referred to as a flag type because the external shape is a flag shape) by connecting upper and lower headers in parallel with a plurality of evaporation tubes. The high temperature section is a so-called bare pipe without fins, and the evaporating pipe and the economizer pipe in the middle temperature range are finned pipes or spiral spiral finned pipes. The pitch of the fin and the height of the fin from the surface of the tube are appropriately selected according to the temperature of the passing combustion gas, and two or more types of tube groups are provided to enhance the heat transfer efficiency. The heat transfer tubes may be staggered with respect to the gas flow. As shown in the perspective views of FIGS. 4 and 5, the upper header 12u and the lower header 12d are welded to the stubs of the upper body 2 and the lower body 3, respectively. The stubs on the drum side are staggered in both the upper and lower trunks so as not to affect the strength of the drum. If necessary, the heat transfer surface may be formed as a two heat transfer surface type in which heat transfer surfaces are formed in parallel in a line on the left and right with respect to the axis of the header. [Refer to FIG. 3 (B)] In this case, the connection welding between the stub and the header and the connection between the pipe and the header can be performed by using an automatic pipe beveling device or a pipe automatic welding device.

For the economizer, a plurality of evaporating tubes with fins are assembled into a flag type, which is further divided into blocks, which can be taken out of the furnace for inspection and cleaning.

As for the ceiling pipe 15, a single pipe may be provided between the facing portions of the upper header of a plurality of furnaces as shown in FIG. The furnace bottom tube has a similar structure.

FIG. 6 shows a partition wall 12a, FIG. 7 shows a flag type heat transfer tube group for high temperature gas, FIG. 8 shows a partition wall 13a, FIG. 9 shows a flag type heat transfer tube group for a middle temperature part, and FIG. FIG.

As shown in FIG. 3A, a conical cyclone-type baffle 16 can be provided inside the upper drum corresponding to the stub hole into which the air-water mixture flows. A well-known baffle plate having a key-shaped cross section extending in the axial direction of the drum may be used.

<Embodiment 2> When it is necessary to further cope with an increase in the amount of evaporation within the vehicle limit of freight car transportation, as shown in FIG. 11, the upper trunk is moved outward by about 1500 mm from the vertical plane including the axis of the lower trunk. It can be eccentric to some degree. Thus, the number of the flag type heat transfer tubes can be increased by two, and the legs of the upper body support bracket can be provided within the vehicle limit.

Third Embodiment FIGS. 12A and 12B are schematic plan views of an apparatus in which a burner axis is orthogonal to a drum axis.

Fourth Embodiment FIGS. 12C and 12D are schematic plan views when the burner axis is parallel to the drum axis.

Embodiment 5 FIG. 13A is a side sectional view of a so-called two-stage UF type 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. FIG. 2 is a sectional view taken along the line II of FIG.

Sixth Embodiment FIG. 14 is a schematic plan view when an incinerator 20 for incinerating waste and the like is used as a combustion chamber.

<Effects of the Invention> The following effects can be obtained by implementing the present invention.

(1) The number of holes in the drum can be reduced to about 1/20 of the number of holes, and the efficiency of operation, the delivery time, and the price can be significantly reduced.

(2) Since the evaporating tube group is formed in a flag type, the assembling time, the construction period, and the cost can be greatly reduced.

(3) For boilers of 5T / Hr or less, trucks can be transported by assembling factories.

(4) It became easy to enter the furnace from a door (not shown) provided on the side wall or the like for inspection of the evaporation tube group and replacement of the tube.

(5) The use of heat transfer tubes with fins significantly improved the heat transfer efficiency, resulted in a compact structure, and reduced the installation area by about 40% compared to the existing boiler.

(6) The boiler structure can easily cope with an increase in the amount of evaporation because a flag type standard evaporation tube group is employed.

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

(8) In accordance with the characteristics of the fuel burner, the furnace can be easily changed to a single furnace regardless of the evaporating tube group.

[Brief description of the drawings]

FIG. 1 is a side view of the boiler according to the first embodiment, FIG.
FIG. 3 (A) is a perspective view of a conical cyclone-water separator,
3B is a cross-sectional view of a flag-type heat transfer tube group in which two rows (two surfaces) of evaporator tube groups are provided in one header, and FIG. A needle view, FIG. 5 is a partial perspective view of a flag-type heat transfer tube group using finned tubes of a middle temperature part, FIG. 6 is a front view of a partition wall 12a, FIG. 7 is a front view of a flag type heat transfer tube group of a high-temperature part, FIG. 8 is a front view of the partition wall 13a, FIG. 9 is a front view of a flag type heat transfer tube group formed by pipes with fins for the middle temperature section, FIG. 10 is a front view of the economizer, and FIG. FIG. 12 (A) is a sectional view in which the upper torso is positioned slightly to the right of the drawing so that it can be increased.
(B) is a schematic plan view of a furnace arrangement in which the burner axis is orthogonal to the drum axis, and (C) and (D) are schematic plan views of a furnace arrangement in which the burner axis is parallel to the drum axis. 13 (A) is a side view when the furnace and the evaporating tube group are stacked in two stages,
(B) is a sectional view taken along the line II of (A), FIG. 14 is a plan view of a boiler with an incinerator, and FIG. 15 is a side view of a conventional boiler. 1 ... boiler 2 ... upper body 3 ... lower body 4 ... U-shaped membrane wall 8 ... burner 9 ... furnace 11 ... air port 12 ... evaporating tube group 13 ... evaporating tube group 14 ... coal saving Vessel 15… Ceiling tube 16… Cyclone baffle 20… Incinerator

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Eitaro Kataoka 1-2-10 Isogo, Isogo-ku, Yokohama-shi, Kanagawa Bab Hitachi Engineering Services Co., Ltd. (56) References JP-A-54-130701 (JP, A (58) Field surveyed (Int.Cl. ⁶ , DB name) F22B 21/04

Claims (6)

(57) [Claims] In a boiler having a U-shaped membrane wall, an evaporating tube group is formed in one block of a flag type tube group, and a partition wall forming a bent combustion gas passage is provided with a refractory material on one flag type surface. Is characterized by
UF type boiler. 2. The UF according to claim 1, wherein the flag type tubes are formed and arranged so that the evaporating tube group is arranged in a staggered manner in a cross section.
Type boiler. 3. The UF type boiler according to claim 1, wherein the burner axis is arranged parallel to the axis of the drum. 4. The UF type boiler according to claim 1, wherein the burner axis is arranged orthogonal to the axis of the drum. 5. The combustion chamber as an incinerator for waste or the like.
Or the UF type boiler according to 2. 6. The UF type boiler according to claim 1, wherein a combustion chamber is provided on the left and right sides with respect to the drum axis in plan view.