JPH0232734A - Emergency hydrogen gas discharger - Google Patents

Abstract

PURPOSE:To prevent explosion of hydrogen gas effectively by encapsulating inert gas such as N2 gas or CO2 gas into a discharge pipe thereby preventing firing of hydrogen gas flowing through the atmospheric pipe even if it is mixed. CONSTITUTION:Hydrogen gas flowing through a machinery such as a generator 5 is discharged, upon emergency of the machinery, to the atmosphere through a discharge pipe 7. Inert gas such as N2 gas or CO2 gas is normally fed through a feed nozzle 9 and encapsulated in the discharging pipe 1. When abnormality occurs in the machinery, an emergency hydrogen gas discharge valve 2 is opened and when the pressure of hydrogen gas in the discharge pipe 1 exceeds over a predetermined level, a pressure discharge partition board 6 is pushed up and rotated around a pin as shown by an arrow thus opening the discharge pipe 7 instantaneously and discharging the residual hydrogen gas to the atmosphere. Operational pressure of the partition board 6 is set lower than that of the hydrogen gas flowing through the generator but higher than the atmospheric pressure.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to an emergency hydrogen gas release device, and particularly to an emergency hydrogen gas release device that can prevent ignition and explosion of released hydrogen gas. Regarding equipment.

(Prior Art) A large-capacity generator is equipped with a cooling device that circulates a coolant inside the components in order to remove heat generated during operation and prevent thermal deformation of the components. This cooling device is constructed by forming a refrigerant flow path inside or between structural members such as an iron core, a rotor, and a stator, and providing a refrigerant supply device. Liquid cooling such as water or oil is also available as a refrigerant, but hydrogen gas, which has a large heat capacity, is generally used to cool the rotor of a large-capacity generator.

Hydrogen gas is sucked in by the rotating horn from an air supply/exhaust port provided on the rotor surface of the generator, directly cooling the inside of the coil, and then being discharged to the outside of the system. The discharged hydrogen gas is cooled in a heat exchanger and then sent to the supply and exhaust ports again.

By the way, hydrogen gas is flammable, especially if it is present in the air (
A mixed gas with a mixing ratio of 4 to 75% has the property of explosive combustion. Therefore, if an emergency situation such as a failure of the generator itself that uses hydrogen gas as a refrigerant or a fire occurs in the surrounding equipment, or if the hydrogen gas flowing inside the generator leaks into the building from a bearing, etc. Hydrogen gas is easily diluted to a concentration within the explosive limit, and the mixture can easily ignite, causing an explosion and causing secondary disasters.

In order to prevent the above secondary disaster, the generator is equipped with a hydrogen gas emergency release device that releases hydrogen gas into the atmosphere in an emergency.

Conventional hydrogen gas emergency release equipment generally consists of an atmosphere discharge pipe 1 that is raised outside the building from a hydrogen gas flow path inside the equipment, and a hydrogen gas discharge pipe that is opened between the atmosphere discharge pipe 1 and the hydrogen gas flow path inside the equipment. It is composed of an automatic gas emergency release valve 2. The tip of the atmospheric discharge pipe 1 is bent into a zero shape to prevent rainwater from entering. Further, a bypass pipe 3 is provided to bypass the automatic hydrogen gas emergency release valve 2, and an on-off valve 4 is interposed in the bypass pipe 3.

i If an abnormality occurs in each unit or a fire occurs around the equipment, an operation command is transmitted to the hydrogen gas emergency release bag, the hydrogen gas supply valve is shut off, and at the same time the hydrogen gas is The automatic emergency release valve 2 suddenly opens, and the hydrogen gas that has been circulating inside the equipment is released into the atmosphere outside the building via the atmosphere release pipe 1. Meanwhile, a non-flammable gas such as nitrogen gas or CO2 gas is fed into the equipment to purge the remaining hydrogen gas and dilute the remaining hydrogen gas so that it does not reach a concentration within the explosive limit. .

(Problem to be solved by the invention) However, conventional hydrogen gas emergency release devices usually
As shown in the figure, since it has an atmospheric discharge pipe whose open end is open to the atmosphere, it has the disadvantage that dust and water vapor easily enter the inside of this discharge pipe, and rust etc. easily occur.

When the hydrogen gas emergency release device is activated, foreign substances such as dust and rust accumulated in the atmosphere discharge pipe flow together with hydrogen gas at a high speed inside the atmosphere discharge pipe and are ejected into the atmosphere.

At this time, it is known that when the foreign matter is accelerated in the atmosphere discharge pipe, it becomes significantly charged due to friction between the cheap objects or the foreign matter and the inner wall of the pipe. When these charged particles are discharged in a mixture of hydrogen gas and air diluted to a concentration within the explosion limit, the slight discharge energy causes the mixture to ignite and explode inside or outside the atmospheric discharge pipe, causing the surrounding area to explode. There is a risk of damaging the establishment.

The present invention has been made to solve the above problems, and provides a safe hydrogen gas emergency release device that greatly reduces the risk of ignition and explosion inside and outside the popular hydrogen gas release pipe, which has a wide explosion limit. The purpose is to provide.

[Structure of the invention]

(Means for Solving the Problems) The present invention provides a hydrogen gas emergency release device that releases hydrogen gas flowing through the equipment into the atmosphere through an atmosphere release pipe when an equipment abnormality occurs, and in which a nonflammable gas is introduced into the atmosphere release pipe. At the same time, a pressure relief partition plate is attached to the tip of the atmospheric discharge pipe that seals the end of the atmospheric discharge pipe under normal conditions, but opens the atmospheric discharge pipe in the event of an abnormality such as when the pressure inside the atmospheric discharge pipe exceeds a specified value. It is characterized by

(Function) According to the hydrogen gas emergency release bokubi having the above configuration, since non-flammable gas such as N2 gas or CO2 gas is sealed in the atmosphere discharge pipe, even if the hydrogen gas flowing inside the atmosphere discharge pipe is mixed. , will not cause ignition or explosion.

In addition, since the atmospheric discharge pipe is equipped with a pressure relief partition plate that seals the end of the atmospheric discharge pipe under normal conditions, there is no possibility that dust/υ or water vapor may enter the atmospheric discharge pipe and generate foreign substances such as rust. There is no.

Therefore, it is possible to significantly reduce the amount of foreign matter in the atmosphere discharge pipe, and the I! i! F! A prevents electrostatic discharge of charged foreign matter, and effectively prevents ignition and explosion of hydrogen gas.

<Example> Next, an example of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a system diagram showing an embodiment of the hydrogen gas emergency release device according to the present invention, and FIG. 2 is a side view showing its structure.

The hydrogen gas emergency release device according to the present embodiment is a popular hydrogen gas emergency release device that releases hydrogen gas flowing through a generator such as a generator 5 into the atmosphere through the atmosphere release pipe 1 in the event of an equipment abnormality. In addition to filling the pipe 1 with non-flammable gas, the end of the atmospheric discharge pipe 1 is sealed during normal times, but the atmospheric discharge pipe 1 is always opened for 5 seconds, such as when the pressure inside the popular discharge pipe 1 exceeds a specified value. It is constructed by attaching a pressure relief partition plate 6 to the tip of the popular discharge pipe 1.

Further, the popular discharge pipe 1 is provided with an automatic hydrogen gas emergency release valve 2 that is opened and closed in response to an abnormal signal, and is further provided with a bypass pipe 3 that bypasses the automatic hydrogen gas emergency release valve 2. This bypass pipe 3 is provided with an on-off valve 4 .

The pressure relief partition plate 6 is installed so as to cover the tip opening of the atmosphere discharge pipe 1 which is formed to be inclined as shown in FIG. The lower part of the pressure relief partition plate 6 is pivotally supported on the upper side surface of the atmosphere discharge pipe 1 via a pin 7, and the pressure relief partition plate 6 is configured to be freely rotatable about the pin 7. There is.

Further, a backfire prevention buckle 18 is provided inside the upper end of the atmosphere discharge pipe 1 to prevent sparks and flames floating outside the tube from entering the atmosphere discharge pipe 1. Backfire prevention wire mesh 8
For example, it is constructed by laminating a plurality of mesh-like wire meshes.

Furthermore, a supply nozzle 9 is provided in the bypass pipe 3 on the secondary side of the on-off valve 4 to supply nonflammable gas into the popular discharge pipe 1, and a discharge nozzle 10 is further provided on the top side of the atmospheric discharge pipe 1. . The supply nozzle 9 and the discharge nozzle 10 are also used as ringing nozzles for checking the filling of non-flammable gases.

Under normal conditions, nitrogen gas (N2) and carbon dioxide gas (Co
, , ) are passed through the supply nozzle 9 and sealed in the atmosphere discharge pipe 1. Further, during normal operation, the pressure relief partition plate 6 seals the space between the atmosphere discharge pipes 1, so that dust, water vapor, etc. do not enter into the atmosphere discharge pipes 1. Therefore, accumulation of foreign matter such as dust/υ and rusting are less likely to occur in the atmosphere discharge pipe 1.

On the other hand, if an abnormality occurs in the equipment or peripheral equipment and the automatic hydrogen gas emergency release valve 2 is opened and the pressure of hydrogen gas in the atmospheric release pipe 1 exceeds a predetermined value, the pressure will cause the pressure release partition plate 6 to is pushed up.

The pressure relief partition plate 6 is connected to the pin 7 as shown by the arrow in FIG.
The device rotates around the center and instantly releases the atmospheric release pipe 1, releasing the hydrogen gas remaining in the device into the atmosphere.

Here, the pressure at which the pressure relief partition plate 6 operates is set to a predetermined pressure value that is lower than the operating pressure of hydrogen gas flowing in the generator and higher than atmospheric pressure. This operating pressure is determined by the pressure relief partition plate 6
This can be adjusted by changing the inclination angle at which the pressure relief partition plate 6 is mounted or by increasing or decreasing the volume of the pressure relief partition plate 6 itself. Further, the pressure relief partition plate 6 is designed to maintain that state once the opening operation is performed.

In this embodiment, since the atmosphere discharge pipe 1 is sealed by the pressure relief partition plate 6 during normal times, foreign matter such as dust and rust is less likely to accumulate inside the atmosphere discharge pipe 1, and when hydrogen gas is released. Less electrostatic discharge.

Therefore, there is no danger of ignition and explosion of hydrogen gas, and hydrogen gas can be safely released.

In addition, the atmosphere discharge pipe 1 is filled with nonflammable gas in advance, and the hydrogen gas that flows out mixes with it, causing the atmosphere to fall within the explosive limit.
This also eliminates the risk of ignition and explosion.

Furthermore, the backfire prevention wire mesh 8 traps sparks and flames, preventing sources of fire from entering the popular discharge pipe 1.
Hydrogen gas can be safely released into the atmosphere.

In addition, in FIG. 2, the pressure relief partition plate 6 is shown to be reset manually once it has been opened, but as a modification, the pressure relief partition plate 6 can be linked to the opening/closing signal of the hydrogen gas emergency release automatic valve 2. It can also be configured to open and close automatically.

(Effects of the Invention) As explained above, according to the hydrogen gas emergency release bokubi of the present invention, the atmosphere discharge pipe is filled with nonflammable gas such as N2 gas or Co2 gas. Even if flowing hydrogen gas mixes, there will be no ignition or explosion.

In addition, since the atmospheric discharge pipe is provided with a pressure relief partition plate that seals the end of the atmospheric discharge pipe under normal conditions, dust and water vapor do not enter the atmospheric discharge pipe and generate foreign substances such as rust.

Therefore, it is possible to significantly reduce the amount of foreign matter in the atmosphere discharge pipe, preventing electrostatic discharge of foreign matter that is charged due to friction during discharge, and effectively preventing ignition and explosion of hydrogen gas.

[Brief explanation of the drawing]

Fig. 1 is a system diagram showing an embodiment of the hydrogen gas emergency release device according to the present invention, Fig. 2 is a side view showing an embodiment of the present invention, and Fig. 3 is the structure of a conventional hydrogen gas emergency release device. There is a side view showing the 1...Atmospheric release pipe, 2...Hydrogen gas release automatic valve, 3
... Bypass pipe, 4... Opening/closing valve, 5... Generator,
6... Pressure release partition plate, 7... Bin, 8... Backfire prevention wire mesh, 9... Supply nozzle, 10... Discharge nozzle.

Claims (1)

[Claims] In a hydrogen gas emergency release device that releases the hydrogen gas flowing through the equipment into the atmosphere through an atmospheric release pipe in the event of an abnormality, the atmospheric release pipe is filled with nonflammable gas and the end of the atmospheric release pipe is sealed during normal times. On the other hand, a hydrogen gas emergency release device characterized in that a pressure relief partition plate is attached to the tip of the atmosphere release pipe to open the atmosphere release pipe in the event of an abnormality such as when the pressure inside the atmosphere release pipe exceeds a specified value.