Marine nitrogen informatization preparation device and control method thereof

Abstract

The invention discloses a marine nitrogen informatization preparation device and a control method thereof. The marine nitrogen informatization preparation device is jointly composed of a mechanical system and an electrical control system. The mechanical system comprises a compressed air preparation unit, an air pretreatment unit, a nitrogen generation unit (membrane air separation device) and a nitrogen storage unit; the electrical control system is composed of a power distribution unit and a control unit. By detecting the O2 content, the dew point temperature, the membrane inlet and outlet pressure and other parameters in real time, the nitrogen quality is detected in real time in each stage of equipment operation, optimal matching of process variables and membrane performance is achieved, whether emptying is conducted or not is determined in real time according to the detected conditions, the nitrogen purity is guaranteed, and the nitrogen productivity is improved; meanwhile, the film loss is reduced, and the service life of the whole machine is prolonged. The nitrogen quality meets the requirements, and the nitrogen use safety is ensured.

Description

technical field [0001] The invention relates to a marine nitrogen information preparation device 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] Technical status, shortcomings and deficiencies of several current conventional nitrogen production systems [0004] At present, there are three kinds of nitrogen production methods commonly used in industry - cryogenic air separation method, molecular sieve air separation method (PSA) and...

AI Technical Summary

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

Images