Sampling and detection device for oil and gas concentration of storage tank with external floating roof and its sampling and detection method

Abstract

The invention discloses an oil-gas concentration sampling detection device for an external floating roof storage tank and a sampling detection method of the oil-gas concentration sampling detection device. Sampling gas paths of the oil-gas concentration sampling detection device for the external floating roof storage tank are radially distributed on the external floating roof storage tank by taking the circle center of a floating roof as a center and are used for sampling and detecting the oil-gas concentration in an annular sealing space. The oil-gas concentration sampling detection device can detect the oil-gas concentrations at multiple positions in the annular sealing space at any time and analyze the risk of fire and explosion. An alarm signal is sent according to a comparison with an alarm threshold value or a nitrogen filling protection device is driven to operate, so that the part where primary sealing is ineffective and the part where the oil-gas concentration is overproof on the external floating roof storage tank can be found as early as possible, and big fire and explosion accidents caused by ignition sources such as lightning and static electricity are prevented.

Description

technical field [0001] The invention relates to an oil and gas concentration sampling and detecting device, in particular to an oil and gas concentration sampling and detecting device and a sampling and detecting method for the sealed space of an outer floating roof storage tank. Background technique [0002] Large-scale crude oil storage mostly adopts an outer floating roof structure, and there is a gap of 200-300mm between the ring plate on the outer edge of the floating roof and the tank wall. The primary sealing wall adopts mechanical seal or soft seal, and the sealing device is in close contact with the tank body to eliminate gaps and reduce oil and gas volatilization. The secondary seal is composed of a sealing plate, a sealing tape and a rubber sealing strip. The elasticity of the sealing plate is close to the tank wall, and another seal is added on top of the primary sealing, which greatly reduces oil and gas leakage. An annular space is formed between the primary a...

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Problems solved by technology

[0003] In recent years, many large-scale floating roof oil storage tanks have been built in my country. However, during the construction process and after construction, it was found that some sealing forms were improperly used in the design and construction links, and oil and gas leakage occurred, and oil and gas explosions were prone to occur under lightning strikes or static electricity. Phenomenon

Since the large oil storage tanks currently under construction have a large volume and the diameter of the floating plate is large, oil and gas leakage may occur around the entire floating plate. Therefore, it is necessary to adopt the technology of multi-point sampling at multiple locations. How to carry out multi-point sampling is the key The problem that technology must solve first

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