Sale of high pressure plunger pump of bog pumping compressor in Huaqi Houpu LNG filling station

  Sale of Huaqi Houpu LNG filling station , Bog pumping compressor , High pressure plunger pump
Introduction to L-CNG filling station
Our company has recently introduced a new type of gas filling station, namely the liquefied compressed natural gas filling station (i
e
L-CNG filling station), which has only sprung up in recent years
L-CNG gas station technology is a new CNG gas station, which has great application prospects and considerable economic and social benefits

1、 Characteristics of L-CNG filling station
L-CNG filling station gasifies LNG after being pressurized by high-pressure plunger pump to fill CNG vehicles, and the investment and operation cost are lower than that of CNG filling station with the same capacity
In addition, L-CNG gas station has the following advantages:
① There is no need to lay natural gas pipeline, only LNG tanker is needed to carry LNG
Although the price of tank car is high, one tank car can serve multiple filling stations at the same time, which can save costs
With the expansion of the scale of L-CNG filling station, the additional costs will gradually decrease

② The compressors, cooling devices, dehydration and desulfurization devices used in the traditional CNG gas station consume a lot of power, while the L-CNG gas station only uses low-temperature pumps, which consume less power and other costs
Generally, the power of CNG compressor is 5-15 times that of cryogenic pump
This is because in the natural gas liquefaction plant, a lot of energy has been used to change the natural gas from gaseous state to liquid state
After being transported to the gas filling station, the liquid state is directly pressurized, and the liquid is almost incompressible
The energy consumption required to pressurize a certain amount of LNG to 25MPa by high-pressure plunger pump is only 1 / 6-1 / 8 of that required to compress the same amount of gas to 25MPa

③ Low temperature LNG storage tank has high storage density per unit volume and less land
However, ordinary CNG filling stations need huge high-pressure natural gas storage tanks
This is more obvious than CNG filling station

2、 Main work flow of L-CNG filling station
The main work flow of the newly introduced L-CNG filling station of our company is to transport LNG to the filling station and store it, convert LNG into CNG through LNG high-pressure plunger pump and LNG high-pressure vaporizer, and fill CNG tank car
The main work flow of L-CNG filling station includes the following points:
 
 
· Unloading process: pressure unloading (self pressurized unloading) is adopted, that is, the LNG gasified in the unloading supercharger is returned to the tank car storage tank, and the pressure difference between the tank car storage tank and the LNG storage tank in the gas station is increased to realize unloading

· LNG pressurization process: liquid pressurization mainly adopts high-pressure plunger pump, which pressurizes LNG to 25MPa
After the high-pressure plunger pump is started, it will not run directly, but there is a precooling process
This process is to automatically flow the LNG in the storage tank into the high-pressure plunger pump through the pipeline
When the temperature in the high-pressure plunger pump reaches - 162 ℃, it will be started to pressurize the LNG liquid

· Gasification and gas filling process: pressurized LNG is transported to high-pressure air temperature gasifier through pipeline, gasified into CNG, and then gas is added to CNG tank car
The gasified CNG becomes a high-pressure gas with a temperature of - 5 ℃
In order to prevent the low outlet temperature of the high-pressure air temperature gasifier in winter and rainy days, which is easy to freeze in the pipeline, block and damage the subsequent pipeline, a high-pressure water bath gasifier is usually connected in series at the outlet end of the high-pressure air temperature vaporizer to heat the medium in the pipeline when necessary, and the CNG temperature after reheating can reach 5-10 ℃

3、 Conclusion:
L-CNG filling station can be separated from the construction of natural gas pipeline network, creating conditions for the development of natural gas vehicles in areas without pipeline network
Secondly, L-CNG filling station does not use high-pressure compressor and replaces it with low-temperature pump, which greatly reduces the operation cost, investment cost and floor area
With its high flexibility, L-CNG gas station can be used as the standby gas source of the current CNG gas station
It usually reserves LNG and plays a role in case of interruption or insufficient gas supply of CNG gas station, so as to ensure the continuity of gas supply
It is believed that lcng filling station will continue to appear with the maturity of various related technologies