Odor control assembly
View Patent ↗This assembly is an apparatus for recovering vapors during the dispensing of fluids from a storage tank to a receiving tank. More specifically, the assembly reduces odors from storage tanks and loading facilities at asphalt terminals. A dual carbon system was installed for the tanks and the loading rack. The system was operated continuously at a low flow rate to handle stray vapors from the tanks when they are not being filled. The system would be turned to a high flow rate whenever the tanks are receiving product. The blowers on this system are run at a speed proportional to the number of loading arms being used, based on vacuum transmission.
1. An apparatus for recovering vapors during the dispensing of liquid from a dispensing tank to a receiving tank comprising:
a vapor recovery system including two initial stages of filtering, a third carbon filter, and a variable speed blower-pulling vacuum on the vapor recovery system;
a loading arm having a spout adaptable for dispensing liquid in to the receiving tank from the dispensing tank;
a vapor recovery conduit attached to the spout for recovering vapors from the receiving tank;
a vapor recovery conduit adaptable for recovering vapors from the dispensing tank;
wherein the vapor recovery conduits for recovering vapors from the dispensing tank and the receiving tank are connected to the vapor recovery system.
2. An apparatus according to claim 1 wherein the two initial stages of filtering are a first coarse mesh pre-filter and a second coalescing filter.
3. An apparatus according to claim 1 wherein the variable speed blower is based on vacuum transmitter.
4. An apparatus according to claim 1 wherein the variable speed blower includes high speed and low speed actuation valves.
5. An apparatus according to claim 1 wherein the loading arm spout includes a vapor recovery nozzle between the spout and the vapor recovery conduit for recovering vapors from the dispensing tank.
6. An apparatus according to claim 1 including a vapor recovery hood around the loading spout partially covering the receiving tank, wherein the loading arm vapor recovery conduit is attached to the hood instead of the spout.
7. An apparatus according to claim 1 including a vapor recovery hood adjacent the dispensing tank partially covering the dispensing tank, wherein the dispensing tank vapor recovery conduit is attached to the dispensing tank vapor recovery hood instead of the dispensing tank.
8. An apparatus for recovering vapors during the dispensing of liquid from a storage tank to tank trailers comprising:
a loading arm having a spout adaptable for dispensing liquid in to the tank trailers from the storage tank;
a vapor recovery nozzle attached to the spout;
a first vapor recovery conduit attached to the spout;
a vapor recovery system including a prefilter; a second filter attached to the prefilter with a conduit; a first carbon canister attached to the second filter with a conduit; and a variable speed blower;
a vapor recovery conduit adaptable for recovering vapors from the dispensing tank;
wherein the vapor recovery conduits for recovering vapors from the storage tank and the trailers are connected to the vapor recovery system.
9. An apparatus according to claim 8 wherein the two initial stages of filtering are a first coarse mesh pre-filter and a second coalescing filter.
10. An apparatus according to claim 8 wherein the variable speed blower includes high speed and low speed actuation valves.
11. An apparatus according to claim 8 wherein the variable speed blower is based on vacuum transmission.
12. A process for recovering vapors during the dispensing of liquid from a dispensing tank to a receiving tank comprising the steps of:
providing a loading arm having a spout adaptable for dispensing liquid in to the receiving tank from the dispensing tank;
providing a vapor recover conduit to the spout;
providing a vapor recovery system including including two initial stages of filtering and a third carbon filter, a variable speed blower-pulling vacuum on the recovery system;
filtering the vapors from the loading arm spout through the first filter;
filtering the vapors from the first filter through the second filter;
filtering the vapors from the second filter through the carbon filter;
pulling a vacuum on the vapor recovery system with the variable speed blower;
providing a vapor recovery conduit to the dispensing tank;
connecting the vapor recovery conduit for the dispensing tank to the vapor recovery system;
filtering the vapors from the dispensing tank through the first filter;
filtering the vapors from the dispensing tank through the second filter; and
filtering the vapors from the dispensing tank through through carbon filter.
13. A process according to claim 12 wherein the first filter is a coarse mesh pre-filter and the second filter is a coalescing filter.
14. A process according to claim 12 wherein the carbon filters are carbon canisters.
15. A process according to claim 12 wherein the blowers are run at a low speed when the tanks are not being filled.
16. A process according to claim 12 wherein the blowers are run at a high speed when the tanks are being filled.
17. A process according to claim 12 wherein the blowers are run at speeds proportional to a number of loading arms being used.
18. A process according to claim 12 wherein the variable speed blower has a speed based on vacuum transmission.