A system and method for oil and gas recovery with asymmetric double-tank adsorption and desorption

Abstract

The invention discloses a recovery system and a recovery method for an oil gas absorbed and desorbed by asymmetric double pots. The recovery system comprises a first stop valve, a first-level oil gas condenser, a second-level oil gas condenser, a second stop valve, a first-level big activated carbon canister and a third stop valve, wherein an oil gas inlet is connected with one end of the first stop valve; a positive input end of the first-level oil gas condenser is connected with the other end of the first stop valve; a positive output end of the first-level oil gas condenser is connected with an input end of the second-level oil gas condenser; an output end of the second-level oil gas condenser is connected with a negative input end of the first-level oil gas condenser; a negative output end of the first-level oil gas condenser is connected with one end of the second stop valve; the other end of the second stop valve is connected with one end of the first-level big activated carbon canister; one end of the third stop valve is connected with the other end of the first-level big activated carbon canister; the other end of the third stop valve is connected with a first oil gas outlet; the first stop valve, the first-level oil gas condenser, the second-level oil gas condenser, the first-level oil gas condenser, the second stop valve, the first-level big activated carbon canister and the third stop valve are successively connected and form an oil gas recycling subsystem.

Description

technical field [0001] The invention relates to the field of oil and gas recovery equipment, in particular to an oil and gas recovery system and method for asymmetric double-tank absorption and desorption. Background technique [0002] Traditional oil and gas recovery equipment used for tertiary oil and gas recovery or oil depot generally adopts condensation adsorption method, adsorption absorption method and other processes for recovery. For condensation adsorption method, one-to-multi-level stepwise condensation is used to gradually change the phase of oil and gas. Liquefaction and separation, the concentration of the separated oil and gas gradually decreases, and then enters the subsequent activated carbon system for adsorption and purification to be discharged. [0003] Adsorption is to use two sets of adsorption tanks (possibly a group of multiple tanks) with the same volume. When one group of adsorption tanks is adsorbed, the other group of adsorption tanks is desorbed...

AI Technical Summary

Problems solved by technology

[0014] 1. After the tanker at the gas station is unloaded, some gas station operators need to manually check whether the tanker has been unloaded, and open the top cover of the tanker, causing the oil and gas in the tanker to be released into the atmosphere;

[0015] 2. The tank trucks that transport oil to the gas station may pull gasoline today, and then go to the oil depot to pull diesel tomorrow. However, the diesel stacks used by the oil depot to load the tank trucks are not equipped with oil vapor recovery equipment at all (for oil vapor recovery of diesel oil, There is no mandatory requirement in the country), which leads to the gasoline oil gas in the tanker running into the atmosphere in vain;

[0016] 3. The airtightness of the tank car is not tight, and the gas is easier than the liquid to cause a sharp change in volume due to temperature changes. The oil and gas in the tank car will increase the internal pressure of the tank car due to temperature changes. Many tank car covers, detection ports and other parts The airtightness is not tight, and the tank truck is running all over the street with the whole vehicle of oil and gas. When the oil is loaded in the oil depot next time, the internal oil and gas may have been greatly reduced;

[0017] 4. Many tank cars have not been modified to load oil at the bottom, and the size of the upper oil loading port is different. The crane pipe of the oil depot cannot effectively seal the tank mouth of the tank car at all, so that the oil gas recovery equipment of the oil depot cannot collect high-concentration oil gas. Affect the yield of oil gas recovery equipment in oil depot

Due to the very long intervals between each use of oil and gas recovery equipment in gas stations, if the oil and gas recovery equipment in gas stations directly adopts the traditional double-group activated carbon alternate adsorption and desorption process, only one hour in every 24 to 72 hours may be used at full capacity. , most of the rest of the time is idle, no doubt the utilization rate of the adsorption and desorption system is very low

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