External floating roof petroleum storage tank water mist safe protection system and protection method

Abstract

The invention discloses an external floating roof petroleum storage tank water mist safe protection system and a protection method; the external floating roof petroleum storage tank water mist safe protection system comprises a control system, a gas detection analyzer and an inert medium generating system; the control system is connected with the gas detection analyzer; the gas detection analyzer is communicated with a primary sealing space and a secondary sealing space of a petroleum storage tank through a gas pipe for detection and analysis; the inert medium generating system is connected with water mist generators which are arranged in the primary and the secondary sealing spaces of the petroleum storage tank; and the inert medium generating system comprises a water tank which is communicated with the liquid input ends of the water mist generators through high-pressure water pumps and an inert gas storage device which is communicated with the gas input ends of the water mist generators through selection valves. According to the invention, because water mist with inert media is filled into the primary and the secondary sealing spaces of the petroleum storage tank, the petroleum-gas mixture content in the sealing spaces is controlled within a set range, so that the problem that the primary and the secondary sealing spaces of the external floating roof petroleum storage tank are easy to explode.

Description

technical field [0001] The invention relates to a fire safety protection system, in particular to a micro water mist safety protection system and a protection method of an external floating roof oil storage tank. Background technique [0002] Crude oil has a variety of storage equipment, and the external floating roof oil storage tank is currently the most widely used and most mature oil storage tank in the world. There are primary and secondary sealing devices between the edge of the floating roof of the external floating roof oil storage tank and the inner wall of the tank, because there will always be cases of poor sealing, so the oil gas in the primary and secondary sealing space and the oxygen in the air Mixed to form a flammable and explosive mixture of oil and gas. When factors such as terrorist attacks, arson, static electricity, earthquakes, sparks, and lightning make the oil-gas mixture reach the explosive limit, it is very easy to cause an explosion. There have ...

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Problems solved by technology

[0006] 2. The sprayed foam will fill the gap between the tank wall and the weir plate in about 9 minutes, and then the foam can enter the primary and secondary sealed spaces for fire extinguishing. The time delay will cause a large area of ​​oil and gas to burn, or even cause an explosion

[0007] 3. The poor fluidity of the foam makes the fire extinguishing efficiency low

[0008] 4. After the fire is extinguished, a large amount of foam gathers on the floating roof and is not easy to clean up, which will increase the load on the floating roof and even cause the roof to sink

Will increase the load on the floating roof, which may cause a sinking hazard

[0011] 2. Oil fires, especially high-temperature airtight oil storage tank fires, if extinguished directly with water, will cause oil boiling and splashing, which will easily cause the fire to spread rapidly and cause more serious fires

[0013] 1. Carbon dioxide is used as an inert gas to maintain an inert atmosphere in the annular space, but carbon dioxide will cause the greenhouse effect, global warming, glacier melting, and sea level rise. Its use will lead to an increase in the concentration of carbon dioxide in the atmosphere, which is contrary to The ideas and requirements of the Kyoto Protocol to the United Nations Framework Convention on Climate Change;

[0014] 2. In actual use, the sealing conditions of each large oil storage tank are different, and it is impossible to be completely sealed. The time for maintaining the inert atmosphere of different storage tanks will be different. Carbon dioxide is used as the inert gas to maintain the inertness of the annular space. The atmosphere is easy to make the concentration of carbon dioxide in the storage tank area high, thus threatening the safety of the staff;

[0015] 3. The carbon dioxide storage device is liquid carbon dioxide, which must pass through the inertization device to form gaseous carbon dioxide before it is passed into the primary and secondary sealed spaces of the oil storage tank. Although gaseous carbon dioxide can reduce the concentration of flammable gases and oxygen in the sealed space concentration, but it has no effect on reducing the ambient temperature of petroleum storage tanks;

[0016] 4. The transportation cost of liquid carbon dioxide is very high

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