Beijing 2000 gas taxi goes on the road this month

50 km/h collision test gas cylinder is undamaged

In July, Beijing is expected to have about 2,000 gas taxis on the road. Together with the natural gas buses and driving school coaches that have been on the road, this year, the city will have 10,000 natural gas vehicles on the road. "There are 10,000 natural gas bottles for 10,000 natural gas vehicles. They run on the road all day. Is it safe in the end?"

Yesterday, the reporter learned from the “Niangjia” of these cylinders that Beijing Tianhai Industrial Co., Ltd., a subsidiary of Beijing Jingcheng Machinery & Electrical Holding Co., Ltd., learned that this kind of cylinder has experienced a real crash test of a vehicle at a domestic manufacturer a few days ago—at a speed of about At a speed of 50 km/h, which is the normal speed of the city, the gas cylinder was undamaged and there was no gas leakage due to the broken bottle body.

Modified cylinders with 1.2 cubic meters

Whether it is a natural gas bus or a taxi that has risen in recent years, natural gas bottles have been regarded as the "heart" of the gas system. Therefore, any cylinder that has been diagnosed as suffering from "congenital heart disease" is absolutely not allowed to leave the factory in Tianhai Industrial Co., Ltd.

It was this factory that had produced the first oxygen cylinder in North China that Premier Zhou Enlai referred to as the “flare bottle” and has now developed into the largest professional cylinder manufacturer in Asia. A seemingly ordinary CNG (compressed natural gas) bottle has actually gone through an extraordinary journey from R&D to manufacturing.

At 1 a.m. in the production hall outside the East Fifth Ring, the lights were bright and the employees were working nervously. A 1.2-meter-long, 3.56-meter-diameter alloy steel pipe is to be "smelted" into a gas cylinder. It needs to pass through the mouth, bottom, airtight at the bottom, heat treatment, shot blasting, painting, threading, winding, curing, water pressure, and gas. Close to a dozen complex processing links, and the rigorous sampling process gave people a glimpse of the real skill of the “Golden Bell cover”: stretch, impact, blasting, fire and even shooting...

After multiple tests, the improved glass-wrapped cylinders have been reduced by more than one-third of their quality compared to previous cylinders. Because the wrap-around gas cylinders follow the shape of the taxi's trunk, changing the semi-circular shape of the gas cylinders from elliptical to (half-shaped) not only saves space, but almost does not increase the weight of the cylinders. Another 1.2 cubic meters of natural gas was installed.

Medium-speed chase gas cylinder will not be damaged

Ms. Minkang Kang just sat on a taxi marked “natural gas” on the door yesterday. She was worried that the green taxis on the road were hybrid vehicles. If the fuel system caught fire, would the gas in the bottle be detonated?

In the circle of friends, anyone who knows where Shi Fengwen's company is a gas cylinder will almost always ask the same question.

In order to ensure the safety of the cylinders, the gas cylinders have to pass the fire test before the product is shaped. “It's like the Sun Wukong passes the Flame Mountain, and the gas cylinders are subjected to flames.” He said, 1 minute, 2 minutes... ... The test equipment connected to the gas cylinder shows the number of the beating. When the pressure reaches a certain value, the gas in the bottle will pass through the safety discharge device of the bottle valve to prevent the gas from being affected by the high temperature. explosion occurs.

A few days ago, this kind of gas cylinder experienced a physical collision test with a vehicle at a domestic manufacturer. The collision occurred at a vehicle speed of about 50 km/h, which is the normal speed of the urban area. Natural gas cylinders were undamaged without damage to the bottle body. A gas leak occurred.

The most important test for the overload test of a cylinder is to be carried out in water. When it is full of high pressure gas, the normal pressure in the cylinder is 20 MPa - usually a standard atmospheric pressure is only 0.1 megapascal. Even if the household pressure cooker is used, the maximum internal pressure is only 0.19 megapascals. During the test, even if the internal pressure continues to exceed the cylinder design capacity (50 MPa), at most, it will cause a crack of 30 to 40 centimeters in the cylinder liner and bottle body, and it will never be like a home thermos bottle. Explosive crushing occurs after internal overload.

30 meters before firing a cylinder with more than 10 guns

For this "Sun Wukong", the true test of its "supernatural powers" is the shooting experiment that must be completed under the supervision of a designated supervision and inspection agency. Speaking of shooting experiments a year ago, Shi Fengwen still remembers.

“Bang! 砰! 砰!” A sniper rifle at a 45-degree angle above the cylinder and a straight-line distance of 30 meters fired continuously into the cylinder. However, due to the very hard surface of the cylinder, the bullet was bounced off by the smooth glass fiber. In order to complete the experiment, the inspector used a sniper rifle to aim at the same position on the tank and fired more than a dozen shots before finally shooting through the bottle wall.

There is no market for excellent quality. At present, only the city's auto manufacturers wind up gas cylinder orders will have 3,000 per month, which has accounted for more than 10% of Tianhai's monthly average output last year.