JP2001263602A - Horizontal exhaust heat recovery boiler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the remodeling of the peripheral equipment and facility of an HRSG as much as possible by arranging the equipment and facility in such a way that no temporarily removed facility occurs by taking the removed of a panel into consideration at the time of replacing the panel with a new panel. SOLUTION: The peripheral equipment and facility of the HRSG are concentrately arranged on one side face of an HRSG casing 10 and no equipment nor facility is arranged on the other side face of the casing 10 in the removal allowance for the panel 7. In addition, the other side face of the casing 10 is constituted so that an opening for removing a heat exchanger 7 may be made through the side face. Consequently, the replacement of the heat exchanger 7 can be performed economically without removing temporarily the equipment nor facility including external accessory pipelines.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat recovery boiler (hereinafter, referred to as HRSG) used in a combined cycle power plant, in which a heat exchanger such as an evaporator, a superheater, and a reheater can be easily replaced. The present invention relates to a horizontal HRSG provided with a heat exchanger (hereinafter, referred to as a panel).

[0002]

2. Description of the Related Art In a combined cycle power plant, a gas turbine open cycle section, an HRSG and a steam turbine cycle section are provided with a generator. In the gas turbine open cycle section, while generating power with the gas turbine, the exhaust gas that worked in the gas turbine is introduced into the HRSG,
The heat in the exhaust gas is recovered. In the steam turbine cycle section, cycle power generation is performed by a steam turbine using steam generated by HRSG.

As shown in the side sectional view of FIG. 2, a HRSG which is a steam generator is introduced into a panel 7 composed of a economizer and an evaporator via a water supply pipe 1 from a water supply pump chamber (not shown). The supplied water is heated by exhaust gas introduced into the HRSG to generate steam. The steam generated in the panel 7 is sent to a steam system via a steam drum 3, superheated by a panel 7 such as a reheater and a superheater, and sent to a steam turbine (not shown) via a steam pipe 2. Used for power generation.

In the HRSG equipped with a reheater, the steam worked in the high pressure section of the steam turbine is sent to a panel 7 constituting a reheater through a pipe (not shown) in order to reuse the steam, and the steam turbine is overheated. To the medium pressure section.

Also, since the horizontal HRSG has a self-standing structure,
Ancillary equipment and facilities located around the RSG are HRSG
You need to support yourself. Therefore, conventionally, the attached devices and equipment are arranged by effectively using the upper surface of the HRSG casing 10, but the devices and equipment related to the HRSG main body such as the steam drum 3 and the communication pipe 4 are provided on the upper surface of the casing 10. Since piping and the like are installed, it is impossible to arrange all attached devices and equipment on the upper surface of the casing 10.
Therefore, as shown in FIG. 3, the frame 6 projects from the side surface of the casing 10 to form a floor serving as a space for arranging the attached equipment / equipment 5.

As described above, conventionally, the frame 6 is generally connected to the structure shown in FIG.
Are installed on both sides of the HRSG, and equipment and facilities 5 including attached piping are arranged. A number of panels 7 are installed inside the HRSG which is a steam generator. HRSG casing 1 when replacement is required
It is necessary to open panel 0 and take out panel 7 after installing a temporary monorail (not shown).

[0007]

The above prior art HRS
In the general arrangement of G, with the opening work of the casing 10, equipment and facilities including piping and the like that interfere with the opening are temporarily removed collectively, and a number of panels 7 are taken out inside the HRSG to repair the panels. For example, after work such as replacement with a new panel 7, it is necessary to largely perform a recovery work.

[0008] The object of the present invention is to take out the internal panel of equipment and facilities around the casing of HRSG,
HRSG by arranging such that temporary removal facilities do not occur
The purpose of the present invention is to minimize the amount of work for repairing and remodeling equipment and facilities.

[0009]

The object of the present invention is to provide an H
HRSG only on one side of both sides of RSG casing
This is achieved by arranging peripheral devices and equipment in a concentrated manner, and by not arranging the devices and equipment on the side surface on the opposite side of the casing within the range where the panel is taken out.

That is, according to the present invention, in a horizontal HRSG in which a panel is arranged in a casing constituting an exhaust gas flow path in which exhaust gas flows in a substantially horizontal direction, attached devices and equipment are centrally arranged on one side of the casing, This is a horizontal HRSG in which an opening from which a panel can be taken out can be installed on the other side of the casing.

The panel of the horizontal HRSG of the present invention comprises a economizer,
It consists of an evaporator and a superheater or consists of a economizer, an evaporator, a superheater and a reheater.

[0012]

According to the present invention, in consideration of replacement of a panel installed inside a horizontal HRSG used in a combined cycle power plant, a device / equipment including attached piping outside the HRSG which needs to be installed on the side of the casing is required. By centrally disposing the panels on one side, panel replacement can be economically performed without temporarily removing externally attached devices and equipment.

[0013]

FIG. 1 is a schematic front sectional view of an HRSG according to an embodiment of the present invention. As shown in FIG. 1, one side of a casing 10 serving as a space 9 for extracting a panel 7 of the HRSG is provided with devices around the HRSG.
Instead of disposing the equipment, the frame 6 is protruded from the side surface on the opposite side of the casing 10, and a floor is provided as a space for disposing the accessory device / equipment 5. The devices and equipment around the HRSG are intensively arranged on the bridge 6 and only the one side of the casing 10 where the frame 6 is not provided is opened when the panel 7 is replaced, so that the panel 7 can be taken out. .
At this time, it is desirable that the opening for taking out the panel 7 is constituted by a lid that can be freely opened and closed, always closed completely, and opened only when the panel 7 is taken out.

In the embodiment of the present invention having the above configuration, H
In the RSG, when the panel 7 needs to be replaced, one side surface of the HRSG casing 10 is opened, and a temporary monorail 8 as shown in FIG. The panel 7 is taken out to the extraction space 9.

By arranging the devices and equipment around the HRSG intensively only on the side surface of the casing 10 provided with the bridge 6 as described above, the number of the devices and equipment to be temporarily removed prior to the replacement of the panel 7 can be reduced. It is possible to greatly reduce the number of the panels 7 and easily replace the panel 7.

[0016]

According to the present invention, when replacing a panel in the HRSG, there is no need to remove extra equipment such as equipment and facilities including piping around the HRSG prior to removing the panel, thereby reducing the restoration range. Therefore, both the amount of work and the process are reduced, and the repair cost can be reduced. In addition, by arranging the equipment and facilities usually arranged on both sides of the casing on one side, the physical quantity of facilities such as pipes, cables, floors, walkways, etc. is reduced, resulting in an economical design. With the centralized arrangement of equipment and facilities,
The distance of the corridor at the time of the operator's inspection is also reduced, and the time required for the operator's daily inspection is reduced.

[Brief description of the drawings]

FIG. 1 is a front sectional view showing a schematic floor arrangement around a HRSG according to an embodiment of the present invention.

FIG. 2 is a side sectional view showing an outline of a HRSG panel configuration.

FIG. 3 is a front sectional view showing an example of a conventional floor arrangement around an HRSG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Water supply pipe 2 Steam pipe 3 Steam drum 4 Communication pipe 5 Auxiliary equipment and facilities 6 Frame (extended floor) 7 Panel 8 Temporary monorail 9 Panel extraction space 10 Casing

Claims (2)

[Claims] 1. A horizontal exhaust heat recovery boiler in which a heat exchanger is disposed in a casing constituting an exhaust gas flow path through which exhaust gas flows in a substantially horizontal direction, wherein attached equipment and facilities are concentratedly arranged on one side of the casing. A horizontal exhaust heat recovery boiler, wherein an opening through which a heat exchanger can be taken out can be installed on the other side of the casing. 2. A heat exchanger in a casing comprising a economizer, an evaporator and a superheater or an economizer, an evaporator, a superheater and a reheater. Horizontal waste heat recovery boiler.