1. PetroChina: Pay attention to the metal sign next to the invoice window of the gas station. If it is directly operated, it will have the name PetroChina and so on. If it is a franchise, it will have the word "franchised". In addition, generally gas stations will have a signboard at the entrance, which will indicate the types of oil the gas station provides, business hours, etc., and will also indicate "PetroChina" or "China Petroleum Corporation".

2. When you get another invoice, you can also look at the company number on it and it will also say "China Petroleum Corporation."

3. Sinopec: direct-operated gas stations and franchises Different logos are hung at the stations, and it is not difficult to distinguish them. Direct-operated stations are marked with gold signs, while franchise stations are marked with silver signs. China Petroleum gas stations are not divided in this way, and are divided into asset 4, gas stations and non-operated stations. Asset-type gas stations include wholly-owned, holding and leasing, and non-asset-type gas stations include joint-stock operations and franchises. Most of the oil products in non-asset-type gas stations are provided by PetroChina, but the management rights do not belong to PetroChina, so the oil products are not owned by PetroChina. The quality is not guaranteed by PetroChina.

5. PetroChina’s gas stations are mainly asset-based, including wholly-owned, holding, leasing, acquisition, etc. In addition, there are also franchise stores. It also carries the PetroChina brand, but it should be labeled as a franchise according to regulations. The refined oil it distributes is also self-produced and has nothing to do with PetroChina.

Extended information:

Gas stations. of static electricity

1. Analysis of the electrostatic electrification mechanism of flammable and explosive liquids

Liquids are flowing, stirring, settling, filtering, shaking, spraying, splashing, scouring, pouring and other processes Static electricity may be generated in any liquid, and static electricity often causes fires and explosions in flammable and explosive liquids. The electrification mechanism is based on the electric double layer theory. When liquids and solids come into contact, equal electric charges with opposite signs will be formed at their interfaces. The two layers of charges are called the double layer.

The main reason for the formation of the double layer is that the liquid medium can be dissociated into positive and negative ions in different ways. For example, polar molecular liquids or impurity molecules can be directly dissociated. /p>

2. Analysis of the electrostatic electrification mechanism of flammable and explosive gases

Pure gas is not charged under normal conditions. The reason why high-pressure gas is charged with static electricity when it is ejected is because it is electrostatically charged. There are solid or liquid particles suspended in these gases. When the high-pressure gas is mixed with solid particles, the particles and the gas flow together in the tube when the gas is ejected at high speed. The particles and the inner wall of the tube undergo frequent contact-separation processes, causing the particles and the tube to separate. The walls are respectively charged with equal amounts and different signs.

When high-pressure gas is ejected, if there is liquid (non-solid particles) mixed in the pipe, spray electrification will occur along with the ejection of high-pressure gas. . This is because when the high-pressure gas is ejected, the liquid in the gas comes into contact with the inner wall surface of the pipe or nozzle, and a liquid film is formed on the inner wall surface of the pipe or nozzle, and an electrostatic layer is formed on the solid-liquid interface. When the liquid is peeled off the wall with the movement of the air flow, charge separation occurs, and the charged droplets are dispersed in the gas and ejected, resulting in charging.

3. Several links and reasons for the generation of static electricity in gas stations

There are many facilities in the gas station area, but static electricity mainly accumulates in oil storage tank areas, oil pipelines and refueling areas, and oil tank trucks. Due to the different structures and locations of various facilities and equipment, Therefore, the steps and reasons for the generation of static electricity are also different.

The generation of static electricity in oil storage tanks is generally filled with oil from the bottom when the oil storage tanks are filled with oil or oil products are poured between tanks. Although this method is more reasonable than the upper oil injection method, when the oil is ejected from the oil injection pipe at high speed, the oil tank is charged due to the injection electrification. At the same time, the impact of oil on the tank wall causes oil mist, which can also easily cause charge accumulation and discharge.

Baidu Encyclopedia-Gas Station