Safety engraved in DNA FAW Liberation LNG car is safe and guaranteed

Posted by bruce zhu on February 27th, 2024

Safety engraved in DNA FAW Liberation LNG car is safe and guaranteed

 

 

According to the corporate ticket caliber data, the annual sales volume of the heavy card in 2023 was scheduled for 911,000 units, a year -on -year increase of 36%. Among them, the gas heavy truck sales exceeded 160,000 units throughout the year, an increase of 142,000 units from the same period last year, a significant increase of 543.8%year -on -year. It is one of the market segments that are particularly dazzling in 2023. Looking forward to 2024, the industry's expected sales of heavy trucks may be from 100-11 million vehicles, and the growth of gas heavy trucks will undoubtedly still be the main driving force.

 

With the continuous changes in market demand and the improvement of highway transportation efficiency, the sinotruk engine heavy card is gradually developing towards more horsepower, longer battery life, and more high -end configuration. The key to achieving longer battery life is the gas cylinder, so there are more and more concerns about gas cylinders in the industry. More and more card friends are worried, the LNG gas cylinder does so big? Is safety performance be guaranteed?

 

Under normal circumstances, LNG fuel is to reduce natural gas through the temperature of natural gas through the temperature of its condensate point (-161.5 ° C) to liquid, and stores it in a low-pressure LNG gas tank. After liquefaction, the volume is greatly reduced, about 60 % of the natural gas volume in the normal pressure state.

 

Compared with common gasoline and diesel, these fuels have large differences in physical characteristics.

 

Comparison of combustion points: diesel burning points are 220 ° C, gasoline burning point is 427 ° C, and natural gas burning points are 650 ° C. From the perspective of the ignition point, the natural gas burning point is higher, and it is more difficult to ignite directly. Dean comparison: In the normal pressure state, the density of LNG is about 430-470kg/m³ (slightly different due to the composition), and the air density is about 1.29kg/m³. In other words, even if the LNG gas tank is leaked, the LNG of more than 100 degrees Celsius will quickly occur at normal temperature environment temperature. Far smaller than the air density and quickly volatilize in the air.

 

From the perspective of LNG's 5%-15%explosion limit, it can be ignited or even exploded in this range. However, compared to the explosion concentration of 1%-7.6%of gasoline and 0.5%-4.1%of diesel, the explosion concentration range of LNG is higher. In addition, its density is smaller than air. In an open environment, it is generally not easy to reach the range of this concentration. The chance of burning and explosion is less.

 

Many card friends mentioned the LNG gas vehicle, and the first thing I thought of was flammable and explosive. These are actually two concepts. Under normal circumstances, the normal working pressure of LNG is less than 1.6MPa, which is basically a low pressure state. Internal pressure is relatively greater than external pressure. Even if the external concentration range is appropriate, it will not cause the internal ultra -low temperature liquid to reverse the inside and the internal ultra -temperature liquid state. LNG with a high concentration range, so LNG is more controllable, it is difficult to meet the explosion conditions.

 

It should be noted that if LNG leaks in a relatively closed environment, the concentration is exactly in the range of 5%-15%, and it will be easily ignited or even exploded when it encounters an open flame. However, our trucks are running in a relatively empty area most of the time. After LNG leaks gasification, it will spread quickly. When encountering such accidents, we must evacuate in time and avoid bright fires.

 

From the perspective of LNG fuel itself, there will be no major problems in relative security. So, what about LNG gas storage tanks? Nowadays, in order to achieve longer battery life, many heavy cards have a LNG gas storage tank that costs 2000L and 3000L. Will there be hidden safety hazards?

 

First of all, although there are various capacity LNG gas tanks on the market, without exception, all production and manufacturing must "abide by the rules". Like the production and sales of trucks, the LNG gas cylinder also has relevant standards. According to the "Automobile LPG GB/T34510", all natural gas gas cylinders must meet strict testing of blasting pressure, carrying capacity, impact experiment, combustion testing, and ultrasonic detection to ensure the use of liquefied natural gas gas for cars. The quality and safety of the bottle.

 

In short, no matter what specifications and brand of gas cylinders, before they flow to the market, they must be tested strictly to ensure the safety requirements of the gas cylinder itself materials, structures, and mechanics. In addition, in the LNG gas cylinder structure, it is not the single -layer structure we imagine. In fact, it can be imagined as a "thermos" with the inner and outer structure. In fact, the LNG gas cylinder is a low -temperature high -heat pressure vessel with a double -layer vacuum structure.

 

The inner liquid is used to store the liquefied natural gas of low temperature liquid. It has multiple layers of thermal insulation materials on its outer wall. It has super insulation performance. At the same time The insulation system. The design of the shell and the support system can withstand the related external forces generated by the vehicle when driving.

 

According to the regulations, the internal and external wall materials used in it need to meet the requirements of the "GB ∕ T 24511-2017 Under pressure steel and heat-resistant steel plate and steel belt". The problem.

 

Under normal circumstances, the LNG truck is kept between 0.8-1.4MPa in the working state of the entire vehicle. However, with the changes in temperature, environment, and vehicle status, the pressure inside the gas cylinder will also change at the same time.

 

In order to maintain the stable work pressure inside the gas cylinder, there are multi -level safety valves. In the case of over pressure, the first thing that is opened is the main safety valve (the pressure is about 1.9MPa), and its effect is disperse due to the rising pressure caused by the thermal insulation layer and supporting normal heat leakage loss, after the vacuum is damaged, and under the condition of fire, under the fire conditions The pressure caused by accelerated heat leakage. The pressure setting point with a secondary safety valve (generally more than 2.4MPa) is higher than that of the main safety valve. When the main safety valve fails or occurs, the secondary safety valve is started. Through these two sets of safety valves, it can further guarantee Qi Qi. Bottle safety.

 

In addition, the current LNG gas heavy truck marked gas leakage alarm device. In the LNG gas cylinder, there are abnormal pressure and leakage. See, LNG gas vehicle is not a tiger down the mountain. Relatively speaking, we may focus on how to use it safely to avoid low temperature frostbite and emergency treatment.

 

For truck companies and truck drivers, safety is always the first place. Without safety protection, efficient transportation is just empty talk. As the "elder brother" in heavy truck companies, FAW's liberation in the "oil turning gas" opportunity period actively seizes the changes in market demand. The layout of the field of gas heavy trucks can be described as extremely rich, and security has always been the insistence of FAW's liberation into DNA.

 

J6V lead version LNG traction vehicle: Using high -strength body frames and steel plates, "multi -cavity" connecting patent structure, it is not easy to deform and damage, providing a safe fortress for card friends. The liquid is equipped with a liquid speed device, which is safer to the long slope. It is equipped with a square image and has a video recording function. It has a wide field of vision when turning and reversing. It is safer to drive the rearview mirror with electric power. Standard the front warning (FCW) +lane departure warning (LDW) +body stabilization system (ESC), design with peace of mind to give foot card friends sports car security.

 

J6V Elite LNG traction vehicle: Long -term operation requires reliable quality to ensure. The J6V elite version of the LNG traction vehicle overcome core technical problems to achieve a natural gas engine of 100,000 kilometers long oil replacement cycle. 200,000 kilometers of maintenance, 500,000 kilometers of autonomous long -life wheels, and a wide range of images provide a broad field of vision. A number of active safety systems are standard, stable and reliable, and enjoy the "fast track" to get rich.

 

In short, LNG trucks still have significant advantages in terms of safety, which can not only improve the level of transportation safety, but also effectively reduce environmental pollution and waste of resources.

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bruce zhu

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bruce zhu
Joined: February 8th, 2021
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