Vapor treatment system for volatile liquid

A vapor treatment system incorporated with a storage tank for a volatile liquid, comprising:

• a vapor adsorbent canister containing therein vapor adsorbent;
• a first ventilation line having a first end section connected to an upper space inside the storage tank, and a second end section connected to said vapor adsorbent canister;
• a vapor control valve disposed in said first ventilation line to control flow of vapor of the volatile liquid passing through said first ventilation line;
• a second ventilation line having a first end section connected to a liquid supply pipe through which the volatile liquid is supplied into the storage tank, and a second end section connected to said vapor adsorbent canister;
• a vapor-liquid contacting device including a container disposed inside the storage tank;
• a return line through which the volatile liquid is returned into the storage tank, said return line having an end section located in said container of said vapor-liquid contacting device so as to fill said container with the returned volatile liquid;
• a purge line having a first end section located in said container and close to a bottom of said container of said vapor-liquid contacting device, and a second end section connected to said vapor adsorbent canister;
• and
• a pump disposed in said purge line, said pump being operated to purge the vapor from said vapor adsorbent and feed the purged vapor into said container of said vapor-liquid contacting device so that the vapor is absorbed in the volatile liquid in said container of said vapor-liquid contacting device.

A vapor treatment system incorporated with a storage tank for a volatile liquid, comprising:

• a vapor adsorbent canister containing therein vapor adsorbent;
• a first ventilation line having a first end section connected to an upper space inside the storage tank, and a second end section connected to said vapor adsorbent canister;
• a vapor control valve disposed in said first ventilation line to control flow of vapor of the volatile liquid passing through said first ventilation line;
• a second ventilation line having a first end section connected to a liquid supply pipe through which the volatile liquid is supplied into the storage tank, and a second end section connected to said vapor adsorbent canister;
• a vapor-liquid contacting device disposed outside the storage tank and including a container which is closed to maintain liquid and gas tight seal;
• a return line through which the volatile liquid is returned into the storage tank, said return line having an end section located in said container of said vapor-liquid contacting device so as to fill said container with the returned volatile liquid;
• a purge line having a first end section located in said container and close to a bottom of said container of said vapor-liquid contacting device, and a second end section connected to said vapor adsorbent canister;
• and
• a pump disposed in said purge line, said pump being operated to purge the vapor from said vapor adsorbent and feed the purged vapor into said container of said vapor-liquid contacting device so that the vapor is absorbed in the volatile liquid in said container of said vapor-liquid contacting device.

A vapor treatment system incorporated with a storage tank for a volatile liquid, comprising:

• a vapor adsorbent canister containing therein vapor adsorbent;
• a first ventilation line having a first end section connected to an upper space inside the storage tank, and a second end section connected to said vapor adsorbent canister;
• a vapor control valve disposed in said first ventilation line to control flow of vapor of the volatile liquid passing through said first ventilation line;
• a second ventilation line having a first end section connected to a liquid supply pipe through which the volatile liquid is supplied into the storage tank, and a second end section connected to said vapor adsorbent canister;
• a purge line having a first end section inserted into the storage tank, and a second end section connected to said vapor adsorbent canister;
• a cooling device for cooling and liquefying the vapor of the volatile liquid, said cooling device being disposed in said purge line;
• and
• a pump disposed in said purge line upstream of said cooling device with respect to flow of the vapor upon operation of said pump, said pump being operated to purge the vapor from said vapor adsorbent and to cause the purged vapor to pass through said cooling device so that the purged vapor is cooled and liquefied to be returned to the storage tank.

A gasoline vapor treatment system incorporated with a gasoline tank of an automotive vehicle, comprising:

• a vapor adsorbent canister containing therein vapor adsorbent for gasoline vapor;
• a first ventilation line having a first end section connected to an upper space inside the storage tank, and a second end section connected to said vapor adsorbent canister;
• a vapor control valve disposed in said first ventilation line to control flow of vapor of the gasoline passing through said first ventilation line;
• a second ventilation line having a first end section connected to a liquid supply pipe through which the gasoline is supplied into the storage tank, and a second end section connected to said vapor adsorbent canister;
• a purge line having a first end section inserted into the storage tank, and a second end section connected to said vapor adsorbent canister;
• a device for liquefying the vapor of the gasoline, said liquefying device being disposed in said purge;
• and
• a pump disposed in said purge line upstream of said liquefying device with respect to flow of the vapor upon operation of said pump, said pump being operated to purge the vapor from said vapor adsorbent and to cause the purged vapor to pass through said liquefying device so that the purged vapor is liquefied.