In recent years, with the continuous improvement of domestic economic development, relevant departments pay more and more attention to environmental pollution. In such an environment, many car companies have launched more environmentally friendly new products, such as electric vehicles and gas vehicles. However, transportation commercial vehicles such as semi trailers mainly run long distances, have high requirements for endurance and charging places, and it is difficult to realize comprehensive electrification. Therefore, at present, gas vehicles are mainly used.

Gas semi-trailer refers to a semi-trailer model that uses natural gas as fuel and replaces fuel. Its fuel can generally be divided into LNG (liquefied natural gas) or CNG (compressed natural gas). However, CNG models are relatively few now, mostly LNG models.

With the implementation of national VI emission standard, the exhaust emission monitoring of heavy-duty diesel vehicles is becoming more and more strict. Many car owners have replaced their fuel vehicles with gas vehicles, and some car owners are thinking about replacing their models with gas vehicles.

So, how to choose gas semi-trailer and fuel semi-trailer more appropriate? When it comes to how to choose, we must first weigh the pros and cons.

Advantages of gas semi-trailer:

1. Cheaper fuel

In most cases, natural gas is cheaper than diesel. It is understood that at the same equivalent calorific value, countries around the world will generally 3 The price of natural gas is controlled at about half of the price of 1 litre of diesel. If the thermal efficiency of various engines is relatively close, the fuel cost of gas vehicles is about half that of fuel vehicles. In this way, a lot of money can be saved on vehicle fuel in a year.

2. Protect the engine

As far as the engine at the top of the vehicle window is concerned, natural gas is easier to integrate evenly with the air in the engine, the combustion is more complete and clean, and carbon deposition is not easy to occur. Therefore, it can greatly reduce the wear degree of parts in the engine cylinder, prolong the service life of the engine, and improve the use restriction of lubricating oil, so as to reduce the maintenance or repair cost of the vehicle.

3. Better low temperature starting performance

Car owners in the North may experience this more deeply. It's really not easy to bake the car in the morning. However, there is no such trouble when using gas vehicles, because the vehicle gas tank itself is low-temperature gaseous or liquid, which will not freeze like diesel.

4. Stronger environmental protection

Compared with fuel vehicles, the tail gas of gas vehicles is cleaner, in which the CO2 emission is reduced by about 20%, the CO is reduced by about 97%, the HC (hydrocarbon) is reduced by about 72%, and the NOx (nitrogen oxide) is reduced by about 30%. It basically contains no harmful substances such as lead, sulfide and benzene. There is no need to add additional vehicle urea, and there is no need to worry about fines for excessive tail gas detection. In addition, it can also be encouraged and supported by the state, There are certain tax incentives when buying a car.

5. Not afraid of "fuel consumption" stealing

For semi-trailer owners, "fuel consumption" is quite annoying. Many owners have to sleep on the fuel tank in cold weather. After replacing the gas car, it's different. After all, natural gas can't be stolen if you want to steal it. After all, the risk of stealing gas is much higher than stealing oil. Besides, the price is not as expensive as fuel. Therefore, when the owner is tired, he can stop and rest directly without worrying about fuel being stolen.

Disadvantages of gas semi-trailer:

1. Poor coverage of gas station

At present, the coverage of gas stations in China is far less than that of gas stations. No matter where the owner goes, even in remote mountain villages, he can find gas stations, but gas stations are different. Many counties and even prefecture level cities don't have gas stations. Once the transportation distance is long, it is necessary to calculate at all times, which is quite troublesome. It is also for this reason that there are regional restrictions on the use of gas semi-trailer, so the route must be planned, and the area without gas station cannot go.

2. Gas cars are expensive

It has to be admitted that at present, the selling price of gas semi-trailer is generally higher than that of fuel semi-trailer. Even for refitting, replacing the gas engine and installing the vehicle air tank, pressure reducing valve, mixer, etc., the price is about 100000. This price has directly deterred many car owners.

3. High maintenance costs

Although many Trailer enterprises have made a lot of efforts on the difficulty of gas vehicle maintenance and pay attention to the training of service station maintenance workers, according to some car owners, the repair of gas semi-trailer costs at least more than 1000 yuan at a time, even if one pipe is changed, and the maintenance cost is higher than that of fuel vehicle.

4. Insufficient power

Since the gas fuel occupies a certain volume in the combustible mixture in the cylinder (the volume of fluid fuel in the diesel engine cylinder is ignored), less work is done when using natural gas as fuel under the same cylinder working volume. At present, most of the engines of gas vehicles are refitted from the original diesel engine, so the power tends to decrease by about 10% - 20% after switching to natural gas. This is what the owner said, such as boring climbing and slow acceleration response.

5. Not suitable for long distance

A gas vehicle with a full tank can travel about 700 kilometers, but the fuel vehicle is basically two large fuel tanks. After filling up, it can run more than 2000 kilometers. If it is a long-distance transportation, the gas vehicle will look very weak.

Therefore, when considering the choice of gas semi-trailer or fuel semi-trailer, it is necessary to fully consider the factors such as supply, route, region and so on. For example, for vehicles that transport large goods, green goods or express goods at high speed, they have high requirements for timeliness, so they are not suitable for gas vehicles, because gas vehicles often need to refuel at high speed when running at high speed; For another example, car owners who often run fixed transportation routes and have more gas stations beside the routes are more suitable for gas vehicles, while car owners who need to run nationwide are not suitable for gas vehicles; In addition, it also depends on the area where the owner is located. For example, the northern gas station has a larger coverage, the vehicle is more convenient for gas filling and maintenance, and the Southern gas station has fewer gas stations and less supporting services. In contrast, it is not suitable for gas vehicles.

Some car owners said that the self weight of gas semi-trailer is heavier than that of fuel semi-trailer, which is not appropriate under the background of clear limits on the total weight of semi-trailer. However, with the continuous fermentation and upgrading of lightweight theme in the trailer industry, both gas semi-trailer and fuel semi-trailer can make greater progress in self weight. Just like the lightweight axle developed and produced by Darong group, it provides more possibilities for semi-trailer weight reduction. The new disc brake lightweight axle of Darong can reduce the weight of each axle by about 15% compared with the ordinary axle, which can not only reduce the body weight, but also help to save fuel, reduce tire damage and reduce the cost of comprehensive vehicles.