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CNG Cylinder

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CNG Cylinders

CNG Cylinders

CNG cylinders are divided into two categories according to their application conditions: one is the ground cylinder group, is a buffer from the buffer and improve the efficiency of the filling station fixed bottle group; the other for CNG cylinders The car is a mobile bottle set for CNG long distance transport. This paper mainly analyzes how to improve the volumetric utilization of ground gas cylinders.

Product Details

CNG cylinders are divided into two categories according to their application conditions: one is the ground cylinder group, is a buffer from the buffer and improve the efficiency of the filling station fixed bottle group; the other for CNG cylinders The car is a mobile bottle set for CNG long distance transport. This paper mainly analyzes how to improve the volumetric utilization of ground gas cylinders.

In the CNG filling station early development, the main equipment configuration only compressor, and no gas cylinder group. After years of exploration and practice, people have come to realize that the compressor system is equipped with the appropriate cylinder group (or buffer tank), can significantly improve the stability and reliability of the filling system and other technical performance, greatly improving the system work effectiveness.

The CNG filling station has a greater demand for gas filling capacity (flow rate) than the gas supply capacity of the compressor, and also to avoid compression due to the uncertainty of the aerated vehicle The compressor is often damaged and the compressed gas is temporarily stored in the container, and the compressed high pressure natural gas is charged into the cylinder group for use.

① CNG compressor for the reciprocating compressor, the work of the output pressure of the gas fluctuations, an increase of the cylinder group, you can compress the impact of the compressor to play a buffer effect to ensure the stability of the output airflow.

② increase the capacity of the cylinder group, can not change the gas supply capacity of the gas station under the conditions of appropriate to reduce the compressor displacement, reduce the cost of filling stations. Foreign experience has shown that its cost is about 30% lower than that of a direct inflatable refueling station without a gas cylinder.

③ equipped with a gas cylinder group, can make the compressor in the system work when there is a chance to stop. When the gas cylinder group is filled with gas, the first gas cylinder group to the car cylinder gas, gas cylinders gas is not enough, and then start the compressor. This will reduce the compressor working time, reduce equipment wear and prolong the service life. The volume of the cylinders is appropriately larger and the effect is even more pronounced.

④ liquid fuel (gasoline or diesel) is through the liquid pump to join the car inside the tank. Natural gas and liquid fuel is different from the gas cylinder group by gas, by pressure difference added to the car cylinder. This determines that the filling station to the car cylinder filling compressed natural gas rate is very slow. If the compressor to the filling station is equipped with more gas cylinders, the gas filling rate can be improved due to the increase of the gas storage capacity and the relative increase in the gas volume. However, due to gas pressure alone gas, air pressure can not be added after the gas balance, gas cylinders of the total gas is also used, in some technical information summed up the lowest only 9% or so, which will cause Waste of resources. After the long-term operation of foreign refueling stations, and finally found a better way. After the gas cylinders are divided into groups according to a certain proportion, the volume utilization rate of the cylinder group can be improved, and the air filling rate can be further improved.

⑤ equipped with the appropriate capacity of the cylinder group, the buffer effect can make the compressor pulsating shock caused by the air flow greatly reduced, the pipeline, valves, instruments between the connection is not easy to loose, gas leakage greatly reduced, the system safe and reliable Sex has been significantly improved.

In order to achieve a higher utilization rate of gas storage capacity, we have adopted a three-stage sequential gas filling system. In such a system, the cylinder group is divided into three completely separate separate parts. The three-stage gas cylinders are divided into high pressure (third gas), medium pressure (second gas), low pressure (first gas) bottle set according to the sequence of gas from the bottle group. This division is not divided according to the pressure level of the container, when the gas storage system is full, the three bottles of the initial pressure is 24.8MPa. Three levels of gas storage volume is best to press the low pressure of 50%, the pressure of 30%, 20% of the proportion of high pressure.

The filling machine first gas from the low-pressure bottle group to the vehicle gas, and other low-pressure bottle group and the car bottle group pressure equal (actually through the flow down to an unacceptable level to judge), the filling machine in the control system The gas source of the filling machine is switched to the middle pressure bottle group, and the automobile bottle group is also inflated by the pressure difference until the flow rate is reduced to a certain level and then switched to the high pressure bottle group. Once the high-pressure bottle out of the gas flow down to a certain level, start the compressor directly to the car bottle group until the fill up.

The volume of the three-stage gas cylinders in this scheme can be equal, or they can be divided into three groups of different sizes. In order to make more efficient use of the gas storage volume, the volume ratio of the three groups is divided into 50%, the medium pressure is 30% and the high pressure is 20%. Three-stage gas storage system can greatly improve the efficiency of the use of gas cylinders, but also can improve the gas rate. Table 1 shows the typical three-stage gas cylinders operating parameters, which uses some approximations. The volumetric utilization rates of the low pressure bottle group, the middle pressure bottle group and the high pressure bottle group were 58%, 28% and 11% respectively, and the average volume utilization rate was 39.6%.

By setting up a three-stage gas storage system, we can use about 32% of the total gas storage volume, much higher than the system that uses only differential pressure rather than gas cylinders. In addition, when the filling machine in the three groups of gas cylinders switch between the car bottle group can get three high-speed inflation, the inflation rate has also been greatly improved, but also to the three gas cylinders were depressurized deal with.

Welcome to buy the high standard and ultra light cng cylinders with new design from our professional manufacturers and suppliers in China. We are one of the world's leading brands. Please be free to contact our factory for more details.

cylinders quantity:from 1 to 8 cylinders

capacity: from 1000L to 16000L

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