JP2745329B2 - Exhaust gas combustion processing equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas combustion treatment device, and particularly to safely combust exhaust gas (combustible gas) discharged from safety valves of plants in an emergency. Device for

[Conventional technology]

FIG. 3 shows a known apparatus for safely combusting combustible gas rapidly discharged from safety valves of plants in an emergency. In this apparatus, a main burner (main discharge pipe) 1 for burning the combustible gas, a pilot burner 2a as a pilot flame for igniting the main burner 1, and an igniter 3 for igniting the pilot burner 2a
And a pilot gas supply facility (a fuel gas supply pipe 6a, a fuel gas supply line 6b, a fuel gas supply valve 6c, etc.) for keeping the pilot burner 2a at a pilot flame at all times.

In an emergency, flammable gas is introduced from the plants into the main burner 1 through a gas supply line 10, a safety valve 9, a water sealing drum 8, and a main discharge line 7. This combustible gas is ignited by the ignition device power switch 5a and the ignition device 3, and is combusted by the pilot flame in the pilot burner 2a.

In this case, the pilot burner 2a is always supplied with flammable gas for pilot fire regardless of whether or not the flammable gas is released from the main burner 1. (Chemical Factory, Vol. 14, No. 3, pp. 124-134) Further, a sub-burner (sub-discharge pipe) for introducing fuel from an external system to the main burner (main discharge pipe) is provided for combustion. At the same time, a device has been proposed in which the fuel of the sub-burner is supplied by detecting a pressure increase in an exhaust gas pipe. [Problem to be Solved by the Invention] In the case of the former device (FIG. 3), when the amount of gas released from plants is small, for example, in the early stage of gas release, Since the burner is designed for the maximum flow rate of the released gas, the gas flow rate inside the main burner is slow, and the flame enters the main burner, burning the main burner and damaging the main burner. is there.

In the latter device, the above-mentioned problem is solved, but the pilot burner for igniting the sub-burner is always supplied with gas to make it a pilot flame. For this reason, when the frequency of emergency release of flammable gas from plants is low, the running cost of pilot gas becomes enormous throughout the year and there is a problem from the viewpoint of energy saving.

An object of the present invention is to solve the above-mentioned problems of the prior art,
Exhaust gas combustion processing equipment that can safely ignite and combust the released gas regardless of the flow rate of gas urgently released from the plants, regardless of the flow rate and the size of the gas, and without constantly supplying gas for pilot fire Is to provide.

[Means for solving the problem]

The above-mentioned object is to provide a sub-discharge pipe branched from the main discharge pipe, and to dispose a rupturable plate safety device which is opened at an opening of the main discharge pipe by an exhaust gas pressure equal to or more than a pressure loss (pressure rise) of the sub-discharge pipe, This is achieved by arranging the flammable gas to be burned at the combustion port of the secondary discharge pipe by an igniter activated by a signal from a pressure switch installed in the gas supply line.

[Action]

In the event of an emergency in a plant or the like, in the early stage of gas release at a low gas flow rate, all flammable gas is introduced into the secondary discharge pipe, where it is ignited by the ignition device and burned.
When the amount of flammable gas released from the sub-discharge pipe is equal to or higher than the set value, the gas pressure in the main discharge pipe increases, and the rupture disc safety device installed at the opening of the main discharge pipe operates at a constant pressure. Then, the combustible gas is released from the main discharge pipe opening. At this time, the combustible gas has already been combusted at the combustion port of the sub-discharge pipe, and the combustible gas released from the main discharge pipe is ignited and burned using this as a pilot flame.

Therefore, it is not necessary to always supply fuel gas for pilot fire.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic system diagram showing an embodiment of an exhaust gas combustion treatment apparatus according to the present invention, and FIG. 2 is a main part configuration diagram showing an operation state in the apparatus shown in FIG.

This exhaust gas combustion treatment device branches off from the main discharge pipe 1,
A branch pipe 6 having a smaller inner diameter than the main discharge pipe 1 is provided, and a sub discharge pipe 2 is provided at a tip end of the branch pipe 6. Secondary discharge pipe 2
The ignition device 3 is operated via an ignition device power switch 5 which is activated by a signal from a pressure detector 11 installed on the upstream side (plant side) of the safety valve 9.

At the discharge port (opening) of the main discharge pipe 1, a lid 4 as a rupturable plate safety device which is opened and operated by exhaust gas pressure equal to or higher than the pressure loss (pressure rise) of the sub discharge pipe 2 is installed.

In the apparatus shown in FIG. 1, in the case of an abnormal reaction accident or the like in a plant, it is necessary to release combustible gas in the plant and perform safe combustion treatment. In this case, the gas supply line 10
Safety valve 9 installed in operates the pressure within the plant is P ₂ or more, the combustible gas within the plant will come to flow into the main discharge pipe 1 through the main discharge pipe line 7. Main discharge tube 1
The the outlet pressure P ₃ of the main discharge pipe 1 becomes a P ₂ or more, the lid 4 opening operation is provided. Therefore,
Until the pressure P ₃ in the main discharge pipe 1 becomes equal to or higher than P ₂ , the combustible gas accumulated in the main discharge pipe 1 flows into the branch pipe 6 branched from the main discharge pipe 1 and discharged from the sub discharge pipe 2. Is done. Secondary discharge pipe 2
The flammable gas discharged from the auxiliary discharge pipe 2 by the igniter 3 is ignited and burned at the discharge port of.

The pressure of the gas supply line 10 becomes P _1, when it is detected by the pressure sensor 11, an ignition device power switch 3a is turned ON, the ignition device 3 operates. When the amount of the flammable gas supplied from the main discharge pipe 1 line 7 is larger than the amount of the flammable gas discharged from the sub discharge pipe 2, the pressure P ₃ in the main discharge pipe 1 increases, and it reaches the opening pressure P _2. Then, as shown in FIG. 2, when the lid 4 is opened and the discharge port of the main discharge pipe 1 is opened, the combustible gas is also discharged from the main discharge pipe 1.

At this time, the flammable gas has already been ignited in the sub-discharge pipe 2, and the flammable gas discharged from the main discharge pipe 1 as an ignition source is reliably burned. Note that the following relationship is established between the pressure P ₂ for opening the lid 4, the operating pressure P ₁ of the safety valve 9, and the atmospheric pressure.

Atmospheric pressure << P ₂ << P _{1 In} FIG. 1, when the flow rate of the flammable gas in the main discharge pipe 11 is low, the opening diameter of the sub-discharge pipe 2 is reduced so that an appropriate flow rate of the flammable gas is obtained. Can be secured,
The flame to the main discharge pipe 1 does not flash back, and the combustible gas can be reliably burned.

In FIG. 2, when the pressure P ₃ in the main discharge pipe 1 exceeds the opening pressure P ₂ of the lid 4 and the lid 4 is opened and the flammable gas is released from the main discharge pipe 1, the auxiliary discharge pipe 2 has already been discharged. Serves as an ignition source, and the combustible gas discharged from the main discharge pipe 1 can be reliably burned. Therefore, it is not necessary to always supply fuel gas to the auxiliary discharge pipe 2 as a pilot flame.

〔The invention's effect〕

As described above, according to the present invention, when the amount of flammable gas to be released is small in an abnormal situation of a plant or the like, the flammable gas can be securely ignited and burned in the auxiliary discharge pipe, so that the flame flashes back. No flammable gas is released to the surrounding environment. In addition, when the amount of combustible gas released from the plants is large, the rupture safety plate device of the main discharge pipe operates, and the combustible gas is ignited and burned reliably using the discharge port of the sub discharge pipe as an ignition source. be able to.

Therefore, it is not necessary to always supply the pilot fire fuel gas, and the supply equipment for the pilot fire fuel gas is not required, and the enormous running cost can be reduced. Further, since the rupture safety plate device is provided at the opening of the main discharge pipe, it is possible to prevent rainwater, birds, and the like from entering the main discharge pipe.

[Brief description of the drawings]

FIG. 1 is a schematic system diagram showing an embodiment of an exhaust gas combustion processing apparatus according to the present invention, FIG. 2 is a main part configuration diagram showing an operation state in the apparatus shown in FIG. 1, and FIG. It is a system diagram showing an example of a device. DESCRIPTION OF SYMBOLS 1 ... Main discharge pipe, 2 ... Sub discharge pipe, 3 ... Ignition device, 4
... lid, 5 ... ignition device power switch, 6 ... branch pipe, 7
… Main discharge pipe line, 8… Water seal drum, 9… Safety valve, 10… Gas supply line, P ₃ …… Safe valve operating pressure, P ₂
… Lid opening pressure, P ₁ … pressure in the main discharge pipe.

Claims (1)

(57) [Claims] 1. A pressure switch for detecting a gas pressure in a discharge pipe through which exhaust gas discharged from plants located upstream flows, a safety valve for preventing an excessive rise in pressure of the discharge pipe, and a main discharge pipe. An exhaust gas combustion treatment device, comprising: a sub-discharge pipe branched from the main discharge pipe and burning exhaust gas at a pipe end; an igniter for igniting exhaust gas discharged by the sub-discharge pipe; and a discharge port of the main discharge pipe. A rupturable plate safety device that is opened by an exhaust gas pressure equal to or higher than the pressure loss of the sub-discharge pipe is provided, and the ignition device is activated by a signal from the pressure switch, and the exhaust gas is discharged at a combustion port of the sub-discharge pipe. An exhaust gas combustion treatment device characterized by igniting.