JPH05146667A - Inert gas generating system - Google Patents

Abstract

PURPOSE:To reduce the manufacturing cost of inert gas and suppress the emission of harmful substances. CONSTITUTION:A process for operating an inert gas generating system comprises introducing partly or wholly the exhaust gas from a main engine 1 and an auxiliary boiler 2, removing the residual oxygen from the exhaust gas by an afterburning device 3, passing the exhaust gas through a purification device 4, thereafter removing moisture therefrom through a dehumidifier 10, storing the inert gas liquefied by a liquefying device 5 in a cylinder 6 and removing the same therefrom as required.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inert gas generation system.

[0002]

2. Description of the Related Art LPG is loaded into a tank by an LPG ship or the like,
At the time of unloading, in order to prevent the inside of the tank from being in a flammable atmosphere, replacement with an inert gas having a low oxygen concentration is performed. At this time, the required amount of the inert gas is produced by the inert gas generator and used at the same time.

Further, the inert gas generator used at this time completely burns the fuel with an almost theoretical amount of air, and cools, cleans and dehumidifies the resulting combustion gas having a relatively low oxygen concentration for use.

In this case, the problem is that the apparatus becomes large in size because a required amount of inert gas is first generated during use. Furthermore, in order to obtain combustion gas (exhaust gas) with low oxygen concentration, soot and carbon monoxide, unburned hydrocarbons are generated by combustion near the theoretical air amount, and fuel cost for combustion to generate inert gas, etc. There is a problem. Further, a method of using nitrogen gas or the like manufactured and stored by a completely different system as the inert gas is also used, but this has a problem that the cost of the inert gas increases.

[0006]

Among the problems of the above-mentioned prior art, the present invention intends to downsize the device, suppress the generation of harmful exhaust gas, and significantly reduce the fuel cost required for the production of inert gas. It is to reduce.

[0007]

The present invention introduces a part or all of exhaust gas from a main engine and an auxiliary boiler,
It is characterized by removing residual oxygen in exhaust gas with a reburning device, passing through a purifying device, dehumidifying with a dehumidifying device, storing liquefied inert gas in a cylinder, and taking it out from the cylinder when necessary. I am trying.

[0008]

First of all, according to the present invention, when the inert gas is generated, a dedicated combustion device is not required, so that the fuel cost can be greatly reduced, and the harmful emissions such as soot and the total emission of carbon dioxide are small. .. In addition, since inert gas is manufactured and stored by this device before use,
It can be manufactured in a very small volume of equipment compared to the amount of gas required per hour in use.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings. In the figure, 1 is a main engine such as a diesel engine. 2 is an auxiliary organization such as a boiler. Exhaust gas discharged from the main engine 1 and the auxiliary boiler 2 is discharged through the flue 7. Exhaust gas from the auxiliary boiler 2 is branched by a device 8
Thus, a part or all of it is introduced, the residual oxygen is reduced by the reburning device 3, and harmful substances such as soot are removed by the purifying device 4. The purifying device 4 may be provided upstream of the reburning device 3 or the branching device 8 if necessary. After that, the dehumidifying device 10 dehumidifies. The thus produced inert gas is liquefied by the liquefying device 5 and injected into the cylinder 6 through the switching valve 9. In this case, a cooling device may be provided as needed to cool the gas. When using the inert gas, it is taken out from the cylinder 6 and used by operating the switching valve 9.

[0010]

As described above, according to the present invention, it is possible to reduce the size of the apparatus, suppress harmful emissions, and reduce the cost of producing inert gas.

[Brief description of drawings]

FIG. 1 is a system diagram showing an embodiment of the present invention.

[Explanation of symbols]

 1 Main Engine 2 Auxiliary Boiler 3 Re-combustion Device 4 Purification Device 5 Liquefaction Device 6 Cylinder 7 Flue 8 Branch Device 9 Switching Valve 10 Dehumidification Device

Claims (1)

[Claims] 1. A dehumidifying device after introducing a part or all of exhaust gas from the main engine 1 and the auxiliary boiler 2 and removing residual oxygen in the exhaust gas by a reburning device 3 and passing it through a purifying device 4. An inert gas generation system characterized in that the inert gas dehumidified by 10 and liquefied by the liquefying device 5 is stored in a cylinder 6 and taken out from the cylinder 6 when necessary.