JPH07103982B2 - How to start a boiler with a turbo hot air generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention provides a burner that supplies a high temperature gas to the heat exchanger provided between a water supply passage and a steam recovery passage, and burns into the burner. A compressor for supplying pressurized air and a turbo hot air generator comprising a gas turbine interlockingly connected to the compressor and provided in a high temperature gas supply path from the heat exchanger are provided on the upstream side of the compressor. The present invention relates to a method for starting a boiler with a turbo hot air generator in which an electric fan for start-up and an intake passage with a check valve are connected in parallel.

[Conventional technology]

Conventionally, only one electric fan for start-up is provided to provide a large air volume required for quick cold start, and in both cold start and warm start, the electric fan for start-up is operated until the self-operating state is reached. The burner was rotated at a constant rotation speed to supply a constant amount of combustion air.

[Problems to be solved by the invention]

However, in the case of warm starting, since the temperature of the boiler is high, the gas turbine is supplied with gas at a fairly high temperature and pressure from the beginning, and the amount of combustion air supplied by the compressor is considerably large from the beginning, and therefore a large amount of starting electric motor for starting is used. As a result of excessive supply of combustion air from the fan, there was a disadvantage that the electric power consumption by the electric starting fan was unnecessarily increased during warm starting, and the object of the present invention is not only to perform cold starting quickly. No, there is a point to be able to reduce the power consumption by the electric fan for starting at the time of warm starting.

[Means for solving problems]

The characteristic means of the present invention is, as an electric fan for starting, a first electric fan having an air amount substantially equal to the maximum air amount required for warm starting, and a total air amount of the first electric fan is a maximum air amount required for cold starting. And a second electric fan having an air volume substantially equal to that of the first electric fan are operated in cold start, and only the first electric fan is operated in warm start. In particular, the action and effect are as follows.

[Work]

That is, at the time of cold start, the first and second electric fans are operated to send a large amount of combustion air to the burner, and the increase rate of the fuel supply amount is increased at the time when the combustion air supply amount by the compressor is small. Therefore, cold start can be performed quickly.

At the time of warm start, only the first electric fan is operated, and the gas sent to the gas turbine is at a high temperature and high pressure, so that the combustion air supply amount from the compressor to the burner is considerably large, which is effectively utilized. A large amount of combustion air is sent to the burner by the cooperation of the first electric fan and the compressor to increase the fuel supply amount increasing speed to speed up warm start, while ensuring sufficient electric consumption of the electric start fan. Can be reduced.

〔The invention's effect〕

As a result, not only the cold start can be performed quickly, but also the warm start can be executed in a state of low power consumption, and the warm start can be more advantageously performed in terms of operating cost.

〔Example〕

 Next, examples will be shown.

First, the configuration of the boiler, which is the operation target, will be described with reference to FIGS. 1 and 2.

A combustion chamber (3) for the burner (2) is formed in the lower part of the first water tank (1), and a large number of first smoke pipes (4) connected to the combustion chamber (3) are placed in the upper and lower middle of the first water tank (1). A first heat exchanger (A) is provided in which the high temperature gas from the burner (2) evaporates the stored water in the first water tank (1).

A plurality of second smoke pipes (5) connected to the first smoke pipe (4) are provided above the water storage surface (WL) of the first water tank (1), and high temperature gas from the burner (2) causes the first water tank ( A second heat exchanger (B) is formed which superheats the steam generated in 1) and sends it to the recovery passageway (6).

The second connected to the water supply channel (7) above the first water tank (1)
A water tank (8) is provided, and a large number of third smoke tubes (10) connected to the second smoke pipe (5) and the exhaust passage (9) are provided in the second water tank (8).
The water from the water supply passage (7) is preheated by the high temperature gas from the burner (2), and the hot water supply passage (27) having a known flow rate automatic control means (26) allows the water storage surface ( W
A water supply preheater (C) for supplying hot water so that L) is maintained within a set range is formed.

In short, water and steam are made to flow in the order of the feed water preheater (C), the first heat exchanger (A) and the second heat exchanger (B) and heated by the high temperature gas from the burner (2) so that steam can be generated with good thermal efficiency. It is constructed so that it can be obtained from the recovery path (6).

The pilot burner (31) is connected to the compressor (12), and the amount of air that can completely combust the fuel pressurized and supplied from the fuel passage (33) with the opening / closing valve (32) is generated by the pilot burner (3).
It is configured to be supplied under pressure to 1).

A gas turbine (16) driven by the high-temperature gas is provided in a supply path (15) for feeding the high-temperature gas from the first heat exchanger (A) to the second heat exchanger (B). The compressor (12) is linked and connected, and the compressor (12) is driven by the energy of the high temperature gas.

The intake passage (17) of the compressor (12) is provided with a filter (18) and a check valve (19), and first and second electric fans (20a) and (20b) for starting are connected to the second electric motor. A check valve (28) for allowing the independent operation of the first electric fan (20a) is provided on the discharge side of the fan (20b) so that the first electric fan (20a) has the maximum air volume required for warm starting. The air volume is set to be almost equal and the second electric fan (20
b) is set to a small volume of air volume such that the total air volume with the first electric fan (20a) is substantially equal to the maximum air volume required for cold start.

The oil tank (21), the electric oil pump (22), the oil cooler (23) that uses the cold water in the water supply passage (7), and the bearing part of the rotating shaft (which interlocks the gas turbine (16) and the compressor (12) ( It is provided in the lubricating oil circuit (25) for 24).

A vapor pressure detector (29) is provided in the vapor recovery passage (6), and an air pressure detector (3) is provided in the intake passage (17) of the compressor (12).
0) is provided.

Next, a method of operating the boiler will be described with reference to FIG.

(A) At the cold start, the first and second electric fans (20
a), (20b), and at the time of warm start, only the first electric fan (20a) is operated to open the on-off valve (32) to supply a small amount of fuel suitable for ignition to the pilot burner (31). Then
Ignite the pilot burner (31).

(B) The fuel supply amount to the burner (2) is gradually increased from the initial amount Q _S , the fuel supply amount to the burner (2) is increased to Q ₁ , and the negative pressure is detected by the air pressure detector (30). Then, the first and second electric fans (20a), (20b) are stopped, and the air from the intake passage (17) is supplied to the burner (2) by driving the compressor (12) by the gas turbine (16).

(C) If it becomes the self-driving state, the fuel is increased to the fuel supply amount Q ₂ to the burner (2) commensurate with 100% load of the boiler, and the detection value of the steam pressure detector (29) is increased to P ₁ . Let

(D) After that, in order to maintain the detected value of the steam pressure detector (29) at the set value P ₁ , the fuel supply amount to the burner (2) is adjusted to Q _{1 to} Q ₂ in accordance with the load change of the boiler. Adjust in the range,
Continue self-driving.

(E) During self-powered operation, even if the fuel supply amount to the burner (2) is maintained at the minimum value Q ₁ that enables self-powered operation, the detected value of the steam pressure detector (29) increases and reaches the set value P ₂ . When it reaches, only the small capacity second electric fan (20b) is operated, and the burner (2) is extinguished while the pilot burner (31) is still ignited.

(F) If the detected value of the steam pressure detector (29) decreases to the above set value P ₁ after extinguishing the burner (2) in (e) above, set the fuel supply amount to the burner (2) to Q _1. After the self-driving state, the second electric fan (20b) is stopped, and thereafter the same operation as in the above (d) is performed.

[Another embodiment]

 Next, another embodiment will be described.

The combustion method of the burner (2) and the type of fuel can be changed appropriately.

One or both of the first and second electric fans (20a) and (20b) may be composed of a plurality of units that are connected in parallel, and the first electric fan (20a) to the second electric fan (20b).
May have a large capacity.

The heating load of the burner (2) has decreased below the set value during self-powered operation, or the first or second electric fan (20
Appropriate information can be used to detect that the heating load of the burner (2) has increased above the set value during operation of a) and (20b). For example, the hot air and exhaust gas supplied to the gas turbine (16) can be detected. It may be temperature, air suction pressure from the air pressure detector (30), or the like.

The operation and stop operation of the first and second electric fans (20a), (20b) may be manual operation or automatic operation by a controller.

Whether it is cold start or warm start may be determined artificially or by a controller based on appropriate information such as steam pressure and water temperature of the boiler.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a boiler showing an embodiment of the present invention,
FIG. 2 is a principle diagram of the boiler, and FIG. 3 is a graph for explaining the operating state of the boiler. (2) …… Burner, (12) …… Compressor, (16)
...... Gas turbine, (17) ...... Intake passage, (19) ...... Check valve, (20a) ...... First electric fan, (20b) ...... Second electric fan, (A) ...... First heat Exchanger, (B) ... Second heat exchanger.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Norihiro Nishi, 5-1, Hirano-cho, Higashi-ku, Osaka-shi, Osaka, Osaka, Osaka Gas Co., Ltd. (72) Keimitsu Mori 5-chome, Hirano-cho, Higashi-ku, Osaka, Osaka Address: Osaka Osaka Gas Co., Ltd. (72) Inventor Shinichi Adachi 5-chome, Hirano-cho, Higashi-ku, Osaka City, Osaka Prefecture Osaka City Gas Co., Ltd. (72) Hiroshi Kobayashi 1-9, Oyodokita, Osaka City, Osaka Prefecture No.36 Hirakawa Iron Works Co., Ltd. (72) Inventor Hiroaki Imaya 1-9-9 Oyodokita, Oyodo-ku, Osaka-shi, Osaka Prefecture No.36 Hirakawa Iron Works Co., Ltd. (72) Yoshiharu Ueda 1-chome, Oyodo-kita, Osaka-shi, Osaka 9-36 Hirakawa Iron Works Co., Ltd. (72) Inventor Atsumi Kaminashi 1-9-36, Oyodokita, Oyodo-ku, Osaka City, Osaka Prefecture Hirakawa Iron Works Co., Ltd.

Claims (2)

[Claims] 1. A heat exchanger (A), (B) is provided between a water supply passage (7) and a vapor recovery passage (6), and the heat exchanger (A),
A burner (2) for supplying high temperature gas to (B), and a compressor (1) for supplying combustion air to the burner (2) under pressure.
2) and a turbo hot air generator comprising a gas turbine (16) interlockingly connected to the compressor (12) and provided in a hot gas supply path from the heat exchanger (A), and the compressor ( A method for starting a boiler with a turbo hot air generator in which the electric fans (20a), (20b) for start-up and an intake passage (17) with a check valve (19) are connected in parallel on the upstream side of 12). The first electric fan (20a), (20b) for use with an air volume almost equal to the maximum air volume required for warm starting.
An electric fan (20a) and a second electric fan (20b) having an air volume such that the total air volume of the first electric fan (20a) is substantially equal to the maximum air volume required for cold start are provided in parallel, At the time of cold start, the first and second electric fans (20
A method of starting a boiler with a turbo hot air generator, which operates a) and (20b), and operates only the first electric fan (20a) during warm starting. 2. A boiler with a turbo hot air generator according to claim 1, wherein the capacity of the first electric fan (20a) is set to be larger than that of the second electric fan (20b). Method.