JPH05146668A - Inert gas generating system - Google Patents

Abstract

PURPOSE:To reduce the amt. of harmful exhaust substances emitted from an inert gas generating system. CONSTITUTION:Exhaust gases are partly or wholly introduced from burned exhaust gas supply sources such as a main engine 1 and a boiler 2 and residual oxygen is removed from the exhaust gases through an afterburning device 3 produce inert gas.

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 In an LPG ship or the like, when LPG is loaded into and unloaded from a tank, it is replaced with an inert gas having a low oxygen concentration so as not to create a flammable atmosphere in the tank. As the inert gas used at this time, generally, an exhaust gas obtained by completely burning an appropriate fuel with a theoretical air amount to remove residual oxygen is used. Such an inert gas is required to have a small amount of soot and other harmful substances, and low humidity and low temperature, in addition to the original purpose of low oxygen concentration.

In the conventional inert gas generation system, it is required to reduce the residual oxygen concentration of the combustion exhaust gas which is a raw material of the inert gas. In this case, a large amount of soot, carbon monoxide, etc. are contained in the combustion gas. Hazardous substances are emitted, which causes large-scale and complicated purification devices and cooling devices, and also causes marine pollution and air pollution.

Further, in order to reduce the oxygen concentration in the exhaust gas from the combustion device, it is necessary to perform combustion in a state substantially equal to the theoretical air amount, which results in deterioration of the combustion device and deterioration of durability. Is brought.

[0005]

SUMMARY OF THE INVENTION Among the problems of the above-mentioned prior art, the present invention aims to suppress the adverse effect on the device and the discharge of harmful substances due to the reduction of the residual oxygen concentration in the combustion exhaust gas. To do.

[0006]

The present invention has been made to solve the above problems, and introduces a part or all of exhaust gas from a combustion exhaust gas supply source such as a main engine or a boiler. It is an inert gas generation system characterized in that residual gas in exhaust gas is removed by a reburning device to produce inert gas.

[0007]

According to the present invention, the combustion exhaust gas from the exhaust gas supply source such as the main engine and the boiler can be further combusted by the re-combustion device to reduce the residual oxygen concentration which can be satisfied as the inert gas.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to FIG. In the figure, (1) is the main engine such as diesel engine, and (2) is the auxiliary engine such as boiler. The combustion exhaust gas discharged from the main engine (1) and the auxiliary boiler (2) as the exhaust gas supply source is discharged through the flue (7). The exhaust gas inside this flue (7) is
A part or all of them is introduced, residual oxygen is removed by the reburning device (3), and harmful substances such as soot are removed by the purification device (4). The purification device (4) is a re-combustion device if necessary.
(3) or may be provided upstream of the branching device (8). After that, the dehumidifying device (10) dehumidifies the inert gas thus formed, which is liquefied by the liquefying device (5) and is injected into the cylinder (6) through the switching valve (9). In this case, a cooling device may be provided as necessary to cool the inert gas. When using inert gas, it is taken out from the cylinder (6) and used by operating the switching valve (9).

Next, another preferred embodiment of the present invention will be described with reference to FIG. In the figure, (11) is a combustion device such as a burner, and (12) is a combustion gas generation device such as a boiler. Part or all of the combustion gas extracted from the combustion gas generator (12) is introduced into the re-combustion device (13) to remove the residual oxygen concentration, and the purification / cooling device (14) removes soot and other harmful substances. . The purifying / cooling device (14) may be provided in the preceding stage of the re-combustion device (13), if necessary, as in the above-mentioned embodiment. After that, it is dehumidified by the dehumidifier (15) and then used as an inert gas.

As the re-combustion devices (3) and (13) of the above embodiment and other embodiments, a combustion mechanism using a catalyst or
A combustion mechanism using a burner or the like can be applied.

[0011]

As described above, according to the present invention, since the residual oxygen concentration in the combustion exhaust gas can be lowered to a level at which it can be used as the inert gas by the re-combustion device, the exhaust gas of the device itself for generating the combustion gas can be reduced. It is possible to maintain a value suitable for combustion without forcibly reducing the residual oxygen concentration. Therefore, it is possible to reduce the emission amount of harmful emission substances such as soot and carbon monoxide, and it is possible to reduce the load on various processing devices such as the subsequent purification device.

[Brief description of drawings]

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

FIG. 2 is a system diagram showing another embodiment of the present invention.

[Explanation of symbols]

 (1) Main engine (exhaust gas supply source) (2) Boiler (exhaust gas supply source) (3) Reburner (4) Purification device (5) Liquefaction device (6) Cylinder (7) Flue (8) Branch Equipment (9) Switching valve (10) Dehumidification equipment (11) Combustion equipment (12) Combustion gas generator (exhaust gas supply source) (13) Recombustion equipment (14) Purification / cooling equipment (15) Dehumidification equipment

Claims (1)

[Claims] 1. A method for introducing a part or all of exhaust gas from a combustion exhaust gas supply source such as a main engine or a boiler to remove residual oxygen in the exhaust gas by a reburning device to produce an inert gas. Characteristic inert gas generation system.