JP2000227030A - Antifreezing device for gas turbine intake - Google Patents

Abstract

(57) [Problem] To provide an intake-portion freezing prevention device for a gas turbine that can prevent freezing of an intake portion without causing a problem such as a decrease in efficiency. A heat exchanger (21) is provided at an intake port (18A) of an intake chamber (18) connected to an intake pipe (16) of a gas turbine (10), and the heat exchanger (21) and the exhaust pipe (17) are connected to an exhaust supply path (22). The heat exchanger 2 is connected via an exhaust discharge passage 23.
1, a part of the exhaust gas of the gas turbine 10
7 is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a freeze prevention device for preventing a suction portion from freezing in a gas turbine used for power generation or the like.

[0002]

2. Description of the Related Art An industrial gas turbine used for power generation or the like, as shown in FIG. Exhaust gas is exhausted through an exhaust path b, but the intake path a
A filter is provided at the entrance portion of the device, and the filter prevents the inhalation of dust.

[0003] By the way, in a cold place,
If the filter freezes to lower the intake efficiency, or if the frozen ice falls off and is sucked into the compressor C, it may cause damage or a failure, so it is necessary to take measures to prevent freezing.

[0004] The freeze prevention structure includes a structure for extracting compressed air from the compressor C to the combustor CC as shown by X in the drawing and injecting the compressed air into the intake passage a, and a structure for discharging the compressed air as shown by Y in the drawing. Some of the exhaust gas is returned to the intake air.

[0005]

However, in the case where the compressed air from the compressor of the gas turbine is injected into the intake passage, the efficiency is reduced. In the case where a part of the exhaust gas of the gas turbine is returned to the intake air, the exhaust gas is not exhausted. It produces fouling and corrosion due to combustion products in it. That is, there is a problem that any of the freeze prevention structures causes a problem such as a decrease in efficiency or a stain.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and provides an intake unit freezing prevention device for a gas turbine which can prevent freezing of an intake unit without causing a problem such as a reduction in efficiency. With the goal.

[0007]

According to a first aspect of the present invention, there is provided an apparatus for preventing freezing of an intake portion of a gas turbine, wherein a heat exchanger is provided in an intake passage of the gas turbine, and the heat exchanger and an exhaust passage are provided. Are connected via an exhaust gas supply passage, and a part of the exhaust gas of the gas turbine is supplied to the heat exchanger via the exhaust gas supply passage.

The exhaust supply path is provided with opening / closing means for opening and closing the passage, and opening means for opening the exhaust supply path to the outside in accordance with the closing of the exhaust supply path by the opening / closing means. It is characterized by being provided and configured.

Further, an opening for opening to the outside is formed in the wall surface of the exhaust supply passage, and a position between the position for closing the opening and the position for closing the exhaust supply passage in the exhaust supply passage. A swingable door body is provided, and when the door body closes the opening, the exhaust supply path is opened, and at the position where the exhaust supply path is closed, the opening is opened. It is characterized in that the means are integrally formed.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a configuration diagram conceptually showing gas turbine equipment to which an example of a configuration of an intake unit freezing prevention device for a gas turbine according to the present invention is applied.

The illustrated gas turbine equipment 1 is a gas turbine equipment for power generation.
The generator 12 is connected to the power supply through the enclosure 13, and the whole of them is disposed inside the enclosure 13. The enclosure 13 is connected to an intake / ventilation duct 14 and an exhaust / ventilation duct 15, and the air is ventilated through the intake / ventilation duct 14 and exhausted through the exhaust / ventilation duct 15 by a fan (not shown). It has become.

In the gas turbine 10, an intake pipe 16 is connected to an intake port of the compressor, and an exhaust pipe 17 as an exhaust passage is connected to an exhaust port of the turbine.
Air is sucked in through an intake pipe 16 and exhaust gas is exhausted through an exhaust pipe 17.

The front end of the intake pipe 16 is inserted into an intake chamber 18 having an intake port 18A as an intake passage, and air is sucked through the intake chamber 18. The exhaust pipe 17 is inserted into an exhaust chamber 19, and the exhaust chamber 19 is also connected to the exhaust ventilation pipe 15 of the enclosure 13.

A filter 18B for preventing inhalation of dust is provided at an intake port 18A of the intake chamber 18.

The intake unit freeze prevention device 20 is provided with a heat exchanger 2 at the intake port 18A of the intake chamber 18 upstream of the filter 18B.
1, an exhaust supply path 22 connected to the inlet side of the heat exchanger 21 is connected, and an exhaust discharge path 23 is connected to the outlet side.

The other ends of the exhaust gas supply passage 22 and the exhaust gas discharge passage 23 penetrate into the exhaust gas passage 17 and open. The opening position of the exhaust gas discharge passage 23 is located downstream of the exhaust gas supply passage 22 on the exhaust gas side. It has become. An orifice 17A is provided in the exhaust pipe 17 between the openings of the exhaust supply passage 22 and the exhaust discharge passage 23 so that a pressure difference is generated between the two openings. A part of the exhaust gas flowing through the exhaust pipe 17 is introduced into the exhaust supply path 22, passes through the heat exchanger 21, and is discharged to the exhaust pipe 17 via the exhaust discharge path 23.

As a result, heat is exchanged between the air taken in through the intake port 18A and the exhaust gas of the gas turbine supplied to the heat exchanger 21, and the intake air is heated to prevent freezing. it can.

Here, the exhaust supply passage 22 and the exhaust discharge passage 23
Is provided with a damper 30 as an opening / closing means, and the exhaust supply path 22 and the exhaust discharge path 23 can be opened and closed by these dampers 30. Thereby, when the outside air temperature is not likely to freeze, the heat exchanger 21
The supply of exhaust gas to can be stopped.

As shown in the enlarged view of FIG. 2, the damper 30 has a door 31 having a size capable of closing the passages (the exhaust supply passage 22 and the exhaust discharge passage 23). The passages 22 and 2 are movably pivoted, and their swings
3 is provided so as to be openable and closable, and with the passages 22 and 23 opened, the passage side walls 22A and 23 corresponding to the door body 31.
A is formed by opening openings 22B and 23B communicating with the outside.

That is, the door 31 is closed perpendicularly to the passages 22 and 23 as shown in FIG. 2A, and from the position as shown in FIG. The tip may be swung to the heat exchanger side to be in a state of opening the passages 22 and 23 in parallel with the side walls 22A and 23A. Openings 22B and 23B of 22A and 23A are opened,
When the door 31 opens the passages 22A and 23A, the openings 22B and 23B are closed.

In the intake unit freezing prevention device 20 configured as described above, in the case of an outside air temperature at which there is a risk of freezing, as shown in FIG. 23, and the exhaust supply passage 22 and the exhaust discharge passage 23 are opened. As a result, a part of the exhaust gas flowing through the exhaust pipe 17 is supplied to the heat exchanger 21 via the exhaust supply path 22 and is discharged to the exhaust pipe 17 via the exhaust discharge path 23 to heat the intake air. To prevent freezing.

In the case of an outside temperature at which there is no possibility of freezing,
As shown in FIG. 3B, the exhaust supply passage 22 and the exhaust discharge passage 2
The third damper 30 is closed, and the exhaust supply passage 22 and the exhaust discharge passage 23 are closed. In this manner, when the damper 30 is in the closed state, the exhaust supply passage 22 and the exhaust discharge passage 23 on the heat exchanger 21 side from the damper 30 are opened to the outside through the openings 22B and 23B. The supply to the heat exchanger 21 is not performed, and therefore, the heating of the intake air is not performed.

As described above, when the damper 30 is closed, the exhaust supply passage 22 and the exhaust discharge passage 23 on the heat exchanger 21 side from the damper 30 are opened to the outside through the openings 22B and 23B, thereby opening the opening. Leakage of exhaust gas, which may occur in the case of a damper without 22B and 23B, to the heat exchanger 21 side can be prevented, and the passages 22 and 23 can be completely shut off.

That is, the passage 2 has no openings 22B and 23B.
In the damper in which the doors 2 and 23 are closed by the door 31, a certain gap is inevitably provided between the door 31 and the wall surfaces 22 </ b> A and 23 </ b> A of the passages 22 and 23. It leaks into the passages 22 and 23. As described above, even if the passages 22 and 23 are closed by the door body 31, if exhaust gas flows into the heat exchanger 31, the intake air is unnecessarily heated, thereby lowering the efficiency.
The exhaust supply passage 22 and the exhaust discharge passage 23 are provided with openings 22B, 2B.
Since the heat exchanger 21 is opened to the outside through 3B, the heat exchanger 21 does not reach the outside temperature and does not heat the intake air. Therefore, it is possible to prevent a decrease in efficiency due to unnecessary heating of the intake air.

In the above configuration, both the exhaust supply passage 22 and the exhaust discharge passage 23 are provided with the dampers 30 having the openings 22B and 23B.
May be only on the exhaust supply path 22 side. Further, in the damper 30 having the above configuration, the passages 22 and 23 are closed and opened to the outside by one door body 31, but may be configured by independent door bodies. Things.

[0027]

As described above, according to the apparatus for preventing freezing of an intake portion of a gas turbine of a gas turbine according to the present invention, a heat exchanger is provided in an intake passage leading to a compressor, and the heat exchanger is provided. And the exhaust passage are connected via an exhaust supply passage, and a part of the exhaust gas of the gas turbine is supplied to the heat exchanger via the exhaust supply passage. The heat exchange is performed between the unit and the air that is supplied to the heat exchanger via the exhaust gas supply path and is sucked, and the suction air is heated to prevent freezing.

The exhaust supply path is provided with an opening / closing means capable of opening and closing the passage, and an opening means for opening the exhaust supply path to the outside when the exhaust supply path is closed by the opening / closing means. With this configuration, the exhaust supply path is opened by the opening / closing means in the case of an outside air temperature at which there is a possibility of freezing, and the exhaust supply path is closed and opened by the opening / closing means at the time of the outside temperature of which there is no risk of freezing. By opening to the outside by means, when the outside air temperature is low, the intake air is heated to prevent freezing, and when the outside air temperature is high, the leakage of exhaust gas to the exhaust supply path is prevented and the heating of the intake air is stopped. In addition, the efficiency of the gas turbine can be prevented from lowering.

Further, an opening opening to the outside is formed on the wall surface of the exhaust supply passage, and the opening can be swung between the position for closing the opening and the position for closing the exhaust supply passage in the exhaust supply passage. A door body is provided, and when the door body closes the opening, the exhaust supply path is opened and the opening is opened at the position where the exhaust supply path is closed, and the opening / closing means and the opening means are integrally configured. In addition, the opening and closing of the exhaust supply passage and the opening and closing of the opening can be performed by one door body, and the configuration can be simplified.

[Brief description of the drawings]

FIG. 1 is a configuration diagram conceptually showing gas turbine equipment to which an example of a configuration of an intake-portion freezing prevention device for a gas turbine according to the present invention is applied.

FIG. 2 is an enlarged view of a damper.

FIG. 3 shows a conceptual configuration of an intake-portion freezing prevention device, and (A)
FIG. 3B is a view in which dampers of an exhaust supply path and an exhaust discharge path are respectively opened, and FIG. 3B is a view in which dampers of an exhaust supply path and an exhaust discharge path are respectively closed.

FIG. 4 is a conceptual configuration diagram of a gas turbine having a conventional configuration.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gas turbine equipment 10 Gas turbine 17 Exhaust pipe (exhaust passage) 18A Intake port (intake passage) 20 Intake part freezing prevention device 21 Heat exchanger 22 Exhaust supply path 22A Wall surface 22B Opening 30 Damper (opening / closing means, opening means) 31 Door

Claims (3)

[Claims] 1. A heat exchanger is provided in an intake passage of a gas turbine, and the heat exchanger and an exhaust passage are connected via an exhaust supply passage. An intake unit freezing prevention device for a gas turbine, wherein a part of the device is configured to be supplied through the exhaust gas supply passage. 2. The exhaust supply path is provided with opening / closing means for opening and closing the passage, and opening means for opening the exhaust supply path to the outside as the exhaust supply path is closed by the opening / closing means. The device according to claim 1, wherein the device is provided with a freezing prevention device. 3. An exhaust opening is formed on a wall surface of the exhaust supply passage, and an opening is formed in the exhaust supply passage between a position for closing the opening and a position for closing the exhaust supply passage. A swingable door body is provided, and when the door body closes the opening, the exhaust supply path is opened, and at the position where the exhaust supply path is closed, the opening is opened. 3. The apparatus according to claim 2, wherein the means is integrally formed.