JPH087201Y2 - Waste heat boiler - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an exhaust heat boiler used for heat recovery of exhaust gas discharged from a prime mover such as a gas turbine, a diesel engine or a gas engine.

[Conventional technology]

As shown in FIGS. 3 and 4, the conventional waste heat boiler is composed of, for example, a superheater (23), an evaporation pipe section (4), and a economizer section (11). Also in FIGS. 3 and 4, the exhaust gas is discharged from the high temperature side (17) to the outside of the system through the superheater (23), the evaporation pipe section (4), and the economizer section (11), and these are arranged in the horizontal direction. (Fig. 3) or vertically stacked vertically (Fig. 4)
(Fig.) Was normal.

[Problems to be solved by the device]

Conventionally, in a prime mover such as a gas turbine, a diesel engine or a gas engine, the main body of the prime mover is mainly operated, and exhaust heat recovery for extracting steam or the like from the exhaust gas therefrom is usually followed. Therefore, even if the boiler for recovering the exhaust heat cannot be operated, the main requirement is to operate the prime mover side, so there were many requests to be able to operate the prime mover with the boiler stopped. .

As one of the countermeasures for satisfying the above requirements, conventionally, as shown in FIGS. 5 (a) and 5 (b), it was usual to provide a duct that bypasses the boiler portion. In that case, a duct (30) for bypassing the entire exhaust heat boiler portion is provided, and a bypass damper (20) and a boiler inlet damper (19) are provided. In such a conventional configuration, the size of the bypass duct (30), the bypass damper (20), and the boiler inlet damper (19) becomes too large, which causes a problem of high cost of the exhaust heat boiler.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object thereof is to solve the problems described above and to construct a structure of an exhaust heat boiler in a compact manner with a reduced cost.

[Means for solving the problem]

The present invention is an exhaust heat boiler that recovers heat from exhaust gas discharged from a prime mover, in which a superheater and a group of evaporation pipes of the exhaust heat boiler are arranged in an ascending section on the exhaust gas inlet side, and a descender on the exhaust gas outlet side is arranged. A coal economizer group is placed in the section to form a flow of exhaust gas in the exhaust heat boiler, and a bypass damper is installed in the lower part of the central partition wall to exhaust heat at the interface of the pipe group inlet of the exhaust gas inlet side rising part. If there is an inconvenience to the exhaust heat boiler by providing an inlet damper to the boiler, immediately open the bypass damper fully,
At the same time, an exhaust heat boiler is provided, in which an inlet damper to the exhaust heat boiler is provided so as to be fully closed.

Here, the prime mover is a general term for a device that converts natural energy into mechanical energy, and in the present invention, it means, for example, a gas turbine, a diesel engine, or a gas engine.

According to the present invention, the respective parts of the exhaust heat boiler are arranged in one direction (FIG. 3) or overlapped with each other as shown in FIG. 3, FIG. 4 or FIG. (Fig. 4) By completely ignoring the idea, the gas flow from the exhaust gas inlet duct (17) is formed into a mold as shown in Fig. 1 or 2, and the lower part of the partition wall (16) in the middle of the mold is constructed. A bypass damper (30) as shown in FIGS. 5 (a) and 5 (b) is provided by simply providing a bypass damper and providing a boiler inlet damper at the tube group inlet portion of the gas inlet side upper interface portion. It is a completely abolished configuration.

〔Example〕

 Next, the present invention will be described with reference to the drawings.

1 and 2 are schematic cross-sectional views of a waste heat boiler having a mold structure according to the present invention.

In Fig. 1 and Fig. 2, the exhaust gas enters from the inlet duct (17) and immediately passes through the boiler inlet damper provided at the inlet of the tube group at the upper interface of the gas inlet side to become an upper flow and overheat. After passing through the tube group (23), then through the evaporation tube group (4) of the boiler, making a U-turn, passing through the economizer tube group (11), reaching the outlet duct (18), and discharging to the outside of the system. To be done.

A bypass damper (20) is provided under the intermediate partition wall (16), and an inlet damper (19) to the boiler is also provided so that even if the waste heat boiler has a low water level or other inconvenience, these bypass dampers (20) are immediately provided. Also, by opening and closing the inlet damper (19) to bypass the boiler exhaust gas without the conventional bypass duct, the prime mover can be operated at any time. In addition, as shown in FIGS. 1 and 2, the structure of these exhaust gas boilers is provided with a superheater (23), an evaporation section (4), and a economizer section (11) so that the flow of gas in the exhaust gas boiler is modeled. By doing so, we succeeded in achieving a compact configuration for the entire boiler.

(1) is a steam drum, (2) is a downcomer pipe, (3) is an evaporation pipe inlet pipe alignment, (4) is an evaporation pipe group, (5) is an outlet pipe alignment,
(6) is a steam communication pipe, (7) is a water supply pipe, (8) is a water supply pump, (9) is a economizer inlet pipe, (10) is a economizer inlet pipe, and (11) is an economizer. Tube group, (12) outlet outlet, (13)
Is a connecting pipe, (14) is a main steam pipe, (15) is a boiler casing, (16) is a boiler inner partition wall, (17) is an exhaust gas inlet,
(18) is the exhaust gas outlet, (19) is the boiler inlet damper, (2
0) is a bypass damper, (21) is a superheater inlet pipe, (22)
Is an inlet pipe group, (23) is a superheater pipe group, (24) is an outlet pipe group, and (25) is a superheated steam pipe.

[Effect of device]

The present invention eliminates the need for a bypass damper as in a conventional exhaust heat boiler that recovers heat from the exhaust gas of a prime mover, so that the entire exhaust heat boiler can be compactly packaged.
Moreover, even if there is a problem with the exhaust heat boiler, the prime mover can be operated at any time, and as described above, the exhaust heat boiler can be operated without bypassing, as described above. The effect of the co-generation system that can be provided more easily and cheaply is great.

[Brief description of drawings]

1 and 2 are schematic sectional views of an embodiment of the present invention, and FIG.
Fig. 4 is a schematic diagram showing the structure of a conventional exhaust heat boiler, and Figs. 5 (a) and 5 (b) are schematic diagrams showing the bypass duct and damper of the conventional exhaust heat boiler of Figs. 3 and 4. FIG. 1 …… Steam drum, 2 …… Precipitation pipe 4 …… Evaporation pipe group, 7 …… Water supply pipe 8 …… Water supply pump, 11 …… Coalifier pipe group 13 …… Communication pipe, 14 …… Main steam pipe 15 ...... Boiler casing, 16 ...... Boiler partition wall 17 …… Exhaust gas inlet, 18 …… Exhaust gas outlet 19 …… Boiler inlet damper, 20 …… Bypass damper 21 …… Superheater inlet, 23 …… Superheater tube group 24 ...... Outlet pipe, 25 …… Superheated steam pipe 30 …… Bypass duct of conventional exhaust heat boiler

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Sentaro Miura 1-5-20 Kaigan, Minato-ku, Tokyo Tokyo Gas Co., Ltd. (72) Inventor Kazutaka Hosoi 1-5-20 Kaigan, Minato-ku, Tokyo Tokyo Gas Co., Ltd. (56) References JP-A-58-37401 (JP, A)

Claims (1)

[Scope of utility model registration request] 1. An exhaust heat boiler for recovering heat of exhaust gas discharged from a prime mover, wherein a partition wall is provided in the center to separate an exhaust gas passage into an inlet side and an outlet side, and a superheater of the exhaust heat boiler. And an evaporator tube group are arranged in the exhaust gas rising portion on the exhaust gas inlet side, and a economizer group is arranged in the exhaust gas outlet side descending portion,
The exhaust gas flow in the exhaust heat boiler is shaped as a mold, a bypass damper is installed in the lower part of the partition wall, and an inlet damper to the exhaust heat boiler is installed at the interface of the pipe group inlet part of the exhaust gas inlet side rising part. An exhaust heat boiler, wherein when the boiler is inconvenient, the bypass damper is immediately fully opened, and at the same time, an inlet damper to the exhaust heat boiler is fully closed.