JP2715064B2 - Thermal power generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermal power generator, and more particularly, to a thermal power generator having a space partitioned at least around a burner of a boiler.

[0002]

2. Description of the Related Art Conventionally, in a thermal power plant, a boiler is surrounded by a wall to reduce noise to a surrounding area or to protect a boiler from salt damage in a thermal power plant constructed in a landfill. . However, in this state, flammable gas generated due to fuel leakage etc. may stay in the wall and ignite, so a space partitioned around the burner (hereinafter simply referred to as this space means this space) ) Is forcibly ventilated with a dedicated fan.

[0003]

Since the conventional thermal power plant is configured as described above, the air in the space which has become high temperature (atmospheric temperature +20 to 25 ° C.) due to the radiant heat of the boiler is wastefully exhausted, As a result, the power generation thermal efficiency was reduced.

Further, noise (about 105 phones) generated when the air in the space is released into the atmosphere is large.

[0005] Therefore, a main object of the present invention is to provide a thermal power generator having high heat generation efficiency and low noise.

[0006]

A thermal power generator according to the present invention has a boiler for heating water with a burner to generate high-temperature and high-pressure steam for power generation, and a partition surrounding at least the burner of the boiler. The ventilated space, a ventilation device for ventilating the air in the space, a combustion air supply device for taking in outside air and sending it to the boiler as combustion air, and an air exhausted from the ventilation device An air supply path for allowing the combustion air intake device to be taken in together with outside air is provided.

In this thermal power generator, the high-temperature air in the space is used as combustion air for the boiler, so that the amount of heat brought into the boiler is increased as compared with the conventional case where high-temperature air is exhausted wastefully, and the power generation thermal efficiency is increased. Will be higher.

[0008] Preferably, a detecting device for detecting the concentration of flammable gas in the space, and a ventilation device based on a detection result of the detecting device, when the flammable gas concentration is lower than a predetermined value. To take the discharged air into the combustion air intake device via the air supply path and release the air discharged from the ventilation device to the atmosphere in response to the flammable gas concentration being higher than a predetermined value. Is further provided.

Accordingly, when the flammable gas concentration in the space becomes higher than a predetermined value, the supply of the air in the space to the boiler is stopped, and the air in the space is released to the atmosphere. Fire in the boiler is prevented.

[0010]

FIG. 1 is a partially omitted block diagram showing a configuration of a thermal power plant according to an embodiment of the present invention.

Referring to FIG. 1, a thermal power plant is provided with a boiler 1 including a burner 1a. This burner 1a
The water is heated by the flame 2 to generate high-temperature and high-pressure steam for power generation.

A space 3 is provided so as to surround the burner 1a, and a ventilation device 4 for forcibly ventilating the space 3 is provided. The ventilation device 4 includes a pushing fan 5, a suction fan 8, and ducts 6, 7, and 9. The pushing fan 5 takes in outside air and sends it to the space 3 through the duct 6. The suction fan 8 takes in the high-temperature air in the space 3 via the duct 7 and discharges the high-temperature air to the outside via the duct 9.

This thermal power plant is provided with a combustion air supply device 10 for taking in outside air and sending it to the boiler 1 as combustion air. Combustion air supply device 10
Includes a pushing fan 11, ducts 12 and 14, and air preheaters 13 and 15. The pushing fan 11 takes in outside air,
The taken outside air is sent to the boiler 1 via the duct 12, the air preheater 13, the duct 14, and the air preheater 15. The air preheater 13 heats the outside air to about 70 ° C. using the steam generated by the boiler 1. The air preheater 15 heats the outside air heated by the air preheater 13 to about 300 ° C. using the exhaust gas of the boiler 1.

The above components are conventionally provided, and the thermal power plant further includes a duct 16,
A gas sensor 17 and a switching damper 18 are provided.

The duct 16 is provided between the side wall of the duct 9 and the vicinity of the suction port of the push-in fan 11 and is used to take the high-temperature air in the space 3 into the combustion air inlet device 10. .

The gas sensor 17 is provided in the space 3,
The concentration of the combustible gas in the space 3 is detected, and an electric signal (for example, a current) having a value corresponding to the detected concentration is output to the switching damper 18.

The switching damper 18 is provided at a branch portion between the ducts 9 and 16, and is provided in the movable damper 1 provided in the duct 16.
8b, a movable damper 18c provided in the duct 9,
In response to the output signal of the gas sensor 9, the movable damper 18b,
And a control device 18a for opening and closing 18c. The controller 18a opens the movable damper 18b and closes the movable damper 18c based on the output signal of the gas sensor 17 in response to the gas concentration in the space 3 being lower than a predetermined value,
When the gas concentration in the space 3 is higher than a predetermined value, the movable damper 18b is closed and the movable damper 18c is opened.

Next, the operation of the thermal power plant will be briefly described. When the gas concentration in the space 3 is lower than a predetermined value, the damper 18b is opened and the damper 18c is closed, and the high-temperature air in the space 3 is supplied to the duct 7, the suction fan 8, the duct 16, and the air supply for combustion. It is supplied to the boiler 1 via the device 10.

When the gas concentration in the space 3 is higher than a predetermined value, the damper 18b is closed and the damper 18c is opened, so that the high-temperature air in the space 3 passes through the duct 7, the suction fan 8 and the duct 9. Released to the atmosphere through the atmosphere.

As described above, in the thermal power plant according to this embodiment, the high-temperature air in the space 3 is used as the combustion air for the boiler 1, so that the high-temperature air in the space 3 is wastefully discharged into the atmosphere. Compared with the conventional case, the power generation heat efficiency can be improved by increasing the amount of heat carried into the boiler 1. Specifically, the power generation thermal efficiency is increased by 0.03%, and an average scale thermal power plant can save 1500 kiloliters / year of fuel. Thereby, emission of carbon dioxide gas of 4000 tons / year can be reduced, and global warming due to increase of carbon dioxide gas can be suppressed.

Further, since the air in the space 3 is sent to the boiler 1 without being released to the atmosphere, there is no noise when the air is released to the atmosphere.

Further, when the gas concentration in the space 3 becomes higher than a predetermined value, the air in the space 3 is released into the atmosphere without being sent to the boiler 1, so that the air containing a high concentration of flammable gas Is not sent to the boiler 1 and a fire does not occur.

In the thermal power plant according to this embodiment,
Although one end of the duct 16 is connected near the suction port of the combustion air supply device 10, one end of the duct 16 may be connected to the side wall of the duct 12 or 14.

[Brief description of the drawings]

FIG. 1 is a partially omitted block diagram showing a configuration of a thermal power plant according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Boiler 1a Burner 3 Space partitioned so as to surround the vicinity of burner 4 Ventilation device 10 Combustion air feeding device 16 Duct (supply path) 17 Gas sensor (detection device) 18 Switching damper (switching device)

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kiyoshi Fukuyama 3-2-2 Nakanoshima, Kita-ku, Osaka City, Osaka Prefecture Inside Kansai Electric Power Co., Inc. (72) Inventor Table Hideki 3-3-1 Nakanoshima, Kita-ku, Osaka City, Osaka Prefecture 22 Kansai Electric Power Co., Inc. (56) References Japanese Utility Model Sho 64-38416 (JP, U) Japanese Utility Model Utility Model Hei 4-33838 (JP, U)

Claims (2)

(57) [Claims] 1. A boiler for heating water with a burner to generate high-pressure steam for power generation, a space partitioned at least around a burner of the boiler, and ventilating air in the space. A combustion device for taking in outside air and feeding it to the boiler as combustion air, and supplying air discharged from the ventilation device to the combustion air supply device. A thermal power generator, comprising: an air supply path for intake along with outside air. 2. A detecting device for detecting a concentration of flammable gas in the space, wherein the flammable gas concentration is lower than a predetermined value based on a detection result of the detecting device. Air discharged from the ventilation device is taken into the combustion air supply device through the air supply path, and is discharged from the ventilation device in response to the flammable gas concentration being higher than the predetermined value. The thermal power generator according to claim 1, further comprising: a switching device for discharging air into the atmosphere.