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Due to the increasingly strict requirements of the international community for ship emissions, many countries have vigorously developed and promoted the application of liquefied natural gas (LNG) power vessels. Recently, the “Guiding Opinions on Promoting the Application of LNG in the Water Operation Industry†issued by the Ministry of Transport of China proposes that by 2020, the proportion of LNG in the energy consumption of inland waterways will exceed 10%. This indicates that the LNG power boat is ushering in a period of rapid development, and the LNG power boat supporting industry will also usher in huge business opportunities.
The reporter learned that in terms of LNG fuel storage tanks, which are important supporting facilities for LNG power vessels, China has fully equipped the relevant supporting capacity. However, due to the initial stage of the transformation and construction of China's LNG power vessels, people attach importance to the storage safety of LNG fuels. Not enough, leading to safety hazards in some LNG fuel tanks in China. According to industry insiders, relevant supporting enterprises should fully recognize the seriousness of this problem, strictly follow the relevant regulations of China Classification Society in manufacturing, and implement modular production to enhance product safety as much as possible.
China has the ability to support LNG storage tanks
In order to ensure that the ship has sufficient gas fuel supply during the life cycle, a certain amount of LNG needs to be stored on the ship. The fuel storage scheme for LNG powerboats has evolved from the independent tank and membrane tank regulations in the International Liquefied Gas Vessel Code. There are A, SPB, C independent fuel tanks and membrane fuel tanks in the world. Design. Among them, the C-type independent fuel tank has high pressure resistance, adopts vacuum insulation design, and has mature design and manufacturing technology. Although it occupies a relatively large ship space, it is still the most suitable type for LNG fuel storage of coastal and inland river vessels. Almost all of the existing LNG power boats in the world use C-type fuel tanks.
Many manufacturers in China have the ability to produce LNG storage tanks of different specifications, with a volume of several thousand cubic meters. According to actual demand and regulatory restrictions, LNG power ship fuel storage tanks do not need to achieve such a large volume. Therefore, China has full production capacity of LNG power ship fuel storage tanks. At present, the products of some LNG power tank fuel storage tank manufacturers have been approved by China Classification Society and have the conditions for loading.
The relevant person in charge of Hubei Jingmen Hongtu Special Aircraft Manufacturing Co., Ltd., which mainly produces 5~60 cubic meters of LNG storage tanks, pointed out that LNG storage tank production has the characteristics of relatively low difficulty, simple maintenance, no patent fees, etc. It should be said that it is not technically There are obstacles. However, there are also some problems in this market. For example, there is a lack of uniform special specifications and standards. All manufacturers are designed according to the relevant principles of China Classification Society and China Maritime Safety Administration and refer to the standard specifications of the pressure vessel industry. This has also led to a safety hazard in some of the LNG storage tanks that require high safety.
Minimize security risks
According to Xu Jianyong, director of the Code Regulation Department of the Wuhan Classification Institute of China Classification Society, there are some problems in the existing LNG power ship storage tanks: the tank casing is made of ordinary carbon steel, which is very likely to cause the tank to be brittle, which leads to Structure collapse; joints, valve parts, gasifiers, etc. are not protected, 70% of LNG leakage accidents occur; heat exchangers use "air temperature type", their gasification performance is greatly affected by the environment, and the volume is large, pipeline Long, increasing the probability of LNG leaks, etc.
To this end, China Classification Society has proposed a modular solution, the specific content includes the following points. First of all, the outer casing of the storage tank should be constructed of stainless steel, because the stainless steel outer tank can temporarily hold the leakage of LNG liquid, the fire resistance is higher than that of ordinary carbon steel, and the impact resistance or collision resistance is strong, and the corrosion resistance is good. The life of the marine tank can be guaranteed. Secondly, the joints, valve parts and gasifiers of the tank should be placed in a cold box with excellent air tightness, so as to contain the leaked LNG, prevent the flammable gas from diffusing and narrow the dangerous area. Again, the water bath heat exchanger is used, and the water bath heat exchanger has good reliability and is not subject to weather conditions. Finally, an integrated design scheme is adopted to integrally design and manufacture LNG storage tanks, cold boxes, heat exchangers, machine bases, and water curtain protection pipelines to form a “gas supply unitâ€, which is beneficial to the overall control risk and is convenient. Product approval.
It is understood that the modular solution proposed by China Classification Society enhances the safety of fuel storage tanks from the perspective of risk control. Although the total cost of fuel tanks will increase by about 15%, it can significantly reduce modular inspection and transportation. The cost of the link, especially in terms of risk control. The industry believes that if LNG storage tank manufacturers adopt this scheme, it will greatly improve the safety of products and improve the production level of the industry as a whole, which will obviously promote the development of China's LNG power vessels.