Marine nitrogen preparation device integrating multiple functions and having safety redundancy and control method thereof

Abstract

The invention discloses a marine nitrogen preparation device integrating multiple functions and having safety redundancy and a control method thereof. The device comprises an air compressor (A1), a compressed air storage tank (A2), a refrigeration dryer (A3), a filter (A4), a membrane inlet flow transmitter (C1), a membrane inlet pressure transmitter (C2), a membrane inlet temperature transmitter (C3), a membrane inlet electromagnetic valve (B1), a membrane air separation device (A5), an oxygen analyzer (C4), a dew point thermometer (C5), a membrane outlet pressure transmitter (C6), an adjusting valve (B3), a membrane outlet three-way valve (B2), and a nitrogen storage tank (A6). By detecting parameters such as O2 content, dew point temperature, membrane inlet and outlet pressure and the like in real time, nitrogen quality is detected in real time in each stage of equipment operation, optimal matching of process variables and membrane performance is realized, and whether emptying occurs or not is determined in real time according to detected conditions, so that nitrogen purity is guaranteed, and nitrogen productivity is improved.

Description

technical field [0001] The invention relates to a safety redundant marine nitrogen preparation device integrating multiple functions and a control method thereof. Background technique [0002] Nitrogen, as the most abundant gas in the air (content in air: 78.084%, boiling point: -195.8°C, condensation point: -210°C), is inexhaustible and inexhaustible. Because of its characteristics, it is a sub-inert gas. as a protective gas. It can be used in LNG storage tank inerting, pipeline purging, atmosphere replacement and other fields. With the current development and application of LNG technology, nitrogen generators have gradually become a key component of the explosion-proof system of LNG tankers and chemical tankers. [0003] Current technical status, shortcomings and deficiencies of several conventional nitrogen preparation systems: [0004] At present, there are three kinds of nitrogen production methods commonly used in industry - cryogenic air separation method, molecular...

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Problems solved by technology

[0006] The disadvantages are that the cryogenic air separation nitrogen production equipment is complex, occupies a large area, the infrastructure cost is high, the one-time investment of equipment is large, the operation cost is high, and the gas production is slow (12-24h), which is not suitable for marine use.

[0008] The disadvantage is that pressure swing adsorption requires frequent switching of valves and other components, the loss of equipment components is large, and the failure rate is high, so it is not suitable for marine use

[0010] The characteristic of this type of device is that the membrane modules used for nitrogen production are consumables and need to be replaced regularly

Nitrogen quality (O2 content) and nitrogen production rate are affected by many parameters such as membrane module performance, membrane inlet temperature, membrane inlet / outlet pressure, membrane inlet / outlet flow rate, etc. If you want to obtain stable nitrogen quality and nitrogen production rate, the parameters affect each other greatly. There are many coupling factors and the control is more complicated

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