SU1643017A1 - Inert gas system on vessel - Google Patents

Description

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(21) 4276415/12 (22) 06 07.8 (46) 2304.91 Bul. Number 15

(71) Odessa Higher Marine Engineering School

(72) D.Yu.Krokhmal AND O.Semirenko, EG Badaln and K.B. Shchiglovsky

(53) 628.74 (088 8)

(56) Gen inert-gas system to eiiminate soot

Carry-over Motorship 75, 56, Ne 658 p 8990

(54) INERT GAS SYSTEM ON SHIPS

(57) The invention relates to shipbuilding, in particular, to the inert gas systems of oil tankers, to improve the efficiency of operation of the inert gas systems by installing a foam generating device inside the pipeline and to exclude air supply to the system to form a foam. The inert gas system consists of a receiving pipe 1. soy

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chimney flue 2 of the boiler with a scrubber 3 of the foam generating device 4 installed inside the pipeline of the inert gas system, the foam destructor 5, the discharge pipe of which is connected by means of the pipeline 6 with the drain pipe 7 of the scrubber of the inert gas blowers 8, the deck water gate 9, the deck pipeline 10 gases, control devices, protection and alarm systems 11, remotely controlled valves 12-14 and a mixer 15. The mixer 15 is connected to the discharge pipe 16 of the cooling pump

The invention relates to shipbuilding, in particular, to ship technical conditioning systems, in particular, to the inert gas systems of oil tankers, and can be used to provide explosion and fire safety of sea and river fleet tankers by supplying purified and cooled flue gases to their tanks.

The purpose of the invention is to increase the efficiency of operation of the inert / gas system by eliminating the ingress of air into the tanks.

The drawing shows a diagram of the inert gas-in system, in which the dotted line shows the electrical circuit.

The inert gas system consists of a receiving pipe 1, connecting the flue 2 of the boiler with a scrubber 3, a foam generating device 4, a foam expansion device 5, the drain pipe of which is connected via a pipe 6 to the drain pipe 7 of the scrubber, inert gas blowers 8, one of which is redundant , deck water gate 9, deck pipeline of inert gases 10, control devices, protection and alarm systems 11, remotely controlled gates 12,13, 14, mixer 15 connected to discharge pipeline 16 cooling water pump 17 by means of a non-return valve 18 and with a capacity of 19 for foaming concentrate by means of a non-return valve 20 and a hydraulic seal 2 I, a also installed in the tank 19 of the lower level sensor 22.

The inert gas system works as follows.

When the pressure of the inert gases in the tanks decreases to the lower limit, the cooling water pump 17 is started up, which supplies water to the scrubs 17 by means of a non-return valve 18. Mixer 15 is also connected to tank 19 for foaming concentrate by means of a non-return valve 20 and (air trap 21). It does not prevent the ingress of atmospheric air into the inert gas system in case of a decrease in the level of the foaming concentrate in the tank 19 below the limit. layer provides a warning alarm to reduce the level of concentrate in the container 19 to the limit. 1 yl.

3 and into the mixer 15 from the pipeline 16 Simultaneously with the start of the pump 17, the valves 12 and 13 are opened. After the valve 12 is opened, the outboard water begins to flow

through the ejector mixer 15, creating razrezhek /. e in the diffuser of the ejector and thereby sucking pevoobrazuyushchy concentrate from the tank 19

Formed with the emulsion enters

the sprinkler unit of the foam generating device 4, as a result of which the grid of the foam generating device 4 is irrigated. After this, the compressor 8 is started, which you work for some time with the closed shutter 14 in order to reduce the starting current of the electric drive. With the opening of 1l for the air, inert gases from the chimney 2 of the boiler through the receiving pipe 1 begin to spread g tanks on

deck pipeline of inert gases 10, previously passed through the foam generating device 4, foam defrosting 5 and deck water sluice 9,

When inert gases purified in the scrubber from coarse soot particles pass through the foam generating device 4, a high-speed furnace is formed by blowing foam bubbles on the ground with frother. The foam bubbles formed are in contact with fine soot particles in inert gases. Due to the fact that foam bubbles form when the irrigated

grids with inert (ats, inert gases with fine particles are outside the bubbles and inside them. During the movement of the foam-gas flow through the pipeline of inert gases from the foaming device 4 to the foam destructor 5, there is a deposition of scum particles on the bubbles of the foam. Particles inside the bubbles precipitated on his

internal surface in accordance with the turbulent-diffusion deposition mechanism. As a result of the destruction of the bubbles during the movement of the foam-gas flow through the pipeline, films and drops are formed, on which particles carried by the gas from the bubbles during their destruction precipitate. The deposition of these particles on the resulting films and drops occurs due to the adhesion forces between them. With the passage of the foam-gas stream. Through the foam injector 5, the frother is separated from the inert gases. The inert gases enter the suction of the inert gas blowers 8, and the foaming agent flowing into the lower part of the foam destructor 5 enters through the scrubber drain pipe 7 through the pipe b.

After the inert gas pumping stations 8 are shut down, the cooling water pump 17 is turned off, the gates are closed, 12. 13, 14. To prevent the foam concentrate from being drained by gravity from the tank 19 to the discharge pipe 16, a non-return valve 18 is provided In the tank 19 through the mixer 15 in the initial period after the start of the pump 17, when the water velocity in the ejector of the mixer 15 is not high enough to create a vacuum, the non-return valve 20 is installed.

In order to signal the low level of foaming concentrate in tank 19, a level sensor 22 is provided, the signal from which is fed to the control, protection and signaling device 11.

In order to protect the inert gas system from the entry of air from the tank 19 into the tanks through the ejector of the mixer 15 in the event of a decrease in the level of concentrate in the tank 19 to the limit, a hydraulic lock 21 is provided.

Similarly, the inert gas system operates during unloading of the group, washing and

inerting empty tanks when changing the atmosphere of tanks from air to inert. Thus, the proposed inert gas system, by installing a foam generating device inside the pipeline of an inert gas system, protecting the system from air leaks from the atmosphere at a low level in the tank for foaming concentrate by installing a hydraulic seal and supplying the system with a foam destructor, provides an explosion compared to the prototype - fire safety of the vessel by eliminating the supply of air to the foam generating device for the formation of foam, as well as to ensure that ffektivnosti inert gas cleaning by fine carbon particles and 90%.

Claims (1)

Invention Formula An inert gas system on ships, containing a scrubber, one of the inlets of which is connected to the outlet of the blower through a non-return valve, the second inlet is connected to the water supply pipeline from the cooling water pump, a foam generating device with a mixer connected to the water supply pipeline by means of a non-return valve, which that. In order to increase the efficiency of operating the inert gas system by eliminating the ingress of air into the tanks, the foam generating device is installed inside the pipeline and has a foam breaker, the drain pipe of which is connected to the scrubber drain pipe, and the foam pipe breaker inlet goes out of the foam generating device, the foam generating device is installed inside the pipe connecting the scrubber with a gas blower, and the mixer has an ejector and is connected to the tank for the foaming concentrate through evozvratnogo valve and hydraulic lock.