Abstract: The advantages and disadvantages of the unloading pump for LPG tanker on direct unloading of LPG storage tank in gas filling station are introduced, and the improvement of the technology and the suggestion for the management of the special tanker truck are put forward.
In order to reduce the pollution of automobile exhaust to the atmospheric environment, purify and improve the urban atmospheric environment, and speed up the development of environmental protection undertakings, some large and medium-sized cities such as Beijing, Shanghai and Shenzhen in China have adopted liquefied petroleum gas as vehicle fuel to build liquefaction LPG filling station (hereinafter referred to as filling station). However, for the urban areas in urban areas, liquefied petroleum gas (LPG) car tankers (hereinafter referred to as tankers) are commonly used due to the very tight land use conditions, the restriction on the conditions of land use of individual refueling stations, or the saving of land. Gas station liquefied petroleum gas storage tank (hereinafter referred to as tank) directly unload LPG process. In view of the current more use of this technology, this paper analyzes the advantages and disadvantages of this technology in order to better and more secure to ensure the implementation of the process.
The use of tank truck unloading pump directly to the filling station tank unloading liquid, the following advantages:
First of all, to save land, make the construction of a station of oil, gas Taiwan more feasible. For the refueling station to set the compressor or the ground hydrocarbon pump to unload the tank, the compressor or the ground hydrocarbon pumping station and the filling stations shall maintain a certain fire prevention distance between the structures. According to the local standards of Guangdong Province, "liquefied petroleum gas Design Specification for Automobile Filling Stations "(DB44 / 99-1999), Shenzhen Special Economic Zone Technical Specification" Design Specification for LPG Filling Station for Automobiles "(SZJG2-1998)," Design Code for Urban Gas "of the People's Republic of China (GB50028 -93) and the People's Republic of China industry standard "Automotive Gas Filling Station Technical Specifications" (CJJ84-2000) requirements.
As the compressor or ground hydrocarbon pump set up need to occupy a larger gas stations. When using the tanker unloading pump to unload the filling station tank, the compressor or the ground hydrocarbon pump may not be provided in the filling station so as to make full use of the site of the filling station and provide some of the filling stations with difficulties in using the land It is possible, in particular, to provide favorable conditions for retrofitting existing gas stations to increase the functions of gas stations.
Second, save investment. The use of tank truck unloading pump directly to the filling station tank unloading liquid, the gas station no longer set a compressor or ground hydrocarbon pump, a tanker can be responsible for multiple gas stations, so as to reduce gas stations Equipment, housing construction and land investment.
Third, simplify the process. The use of tank truck unloading pump directly to the filling station tank unloading liquid tanker truck unloading pump as a part of the gas station process, the use of compressor unloading filling stations, the process is very simple and easy to operate .
Fourth, shorten the discharge time. With the compressor process, the tank truck unloading pump on the filling station tank unloading fluid. The principle is the use of pipeline pump on the liquefied petroleum gas liquefied petroleum gas directly pressure, and the use of compressor unloading principle is through the compressor to change tank car tank and filling station pressure tank to achieve. At the same time, the same energy consumption, unloading pump fluid volume is much greater than the discharge of the compressor.
Of course, there are also some shortcomings in the use of tanker dump trucks for filling stations. The main points are as follows:
First, the tanker unloading pump can not unload the liquid LPG in the tank tank; and a large amount of saturated LPG in the tank tank can not be unloaded. Based on a 20 m3 tank tanker, Approximately 220 kg of liquefied petroleum gas remains in the tanker truck after the liquid has been discharged.
Second, when the tankers are unloaded, the gas phase and liquefied petroleum gas in the liquid phase unloading tube can not be adequately treated; a certain amount of liquefied petroleum gas may easily run away during the process of removing the loading and unloading hoses; if not handled properly, Refueling station safety hazards.
Thirdly, the filling station adopts the unloading process of tanker unloading pump, when the storage tanks in the filling station need to be inverted or poured into tank trucks, the unloading pump can not be realized.
Fourth, tanker truck with unloading pump, not only can unload pump directly to the filling station tank unloading liquid, but also through some modifications can also use its dump truck directly to liquefied petroleum gas cylinders or other liquefied petroleum gas facilities Filling operations, if not properly managed, some units or individuals using tanker own pump directly bottled liquefied petroleum gas, and this filling operation is extremely insecure, will cause great safety of life and property of the people of the country Threats.
It can be seen from the above analysis that it is more advantageous to utilize the compressor or the ground hydrocarbon pump than the direct unloading of the tanker truck by the tanker truck in terms of saving land, saving investment, simplifying the process flow and shortening the unloading time. However, Pump tank tank residual liquefied gas, running large amount of run-off and can not be inverted and other deficiencies. How to solve these shortcomings, make filling station direct use of tanker unloading pump unloading process more reasonable and safe?
We have the following suggestions:
1. In strict accordance with the relevant technical standards, with the management of tanker trucks, increase penalties, to eliminate with a tanker directly to LPG cylinders and other filling facilities to provide liquefied petroleum gas filling operations, so that someone responsible for the special car.
2. A small compressor is installed on the tank truck, and the compressor is used to handle the residual liquid phase and gas-phase liquefied petroleum gas in the tank and the hose of the tank truck.
3. Appropriate revisions to the process pipeline of the gas station, the increase of high-pressure nitrogen system, the use of high-pressure nitrogen refueling tank station to achieve mutual tank or tank tank car tank inverted.
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