Apparatus for hydrocarbon vapor recovery

A vapor recovery unit (VRU), comprising:

• a first shell and tube VRU heat exchanger that comprises
• a plurality of tubes each forming a sorbent material chamber,
• a sorbent material contained within each sorbent material chamber,
• a shell, defining a heat transfer fluid chamber for housing a thermal transfer fluid wherein each of the plurality of tubes is within the heat transfer fluid chamber,
• a manifold in fluid communication with an ullage space of a tank, wherein during operation, the sorbent material captures vapors that originated in the ullage space of the tank or releases fluids to the tank;
• and
• a second shell and tube VRU heat exchanger that comprises
• a plurality of tubes each forming a sorbent material chamber,
• a sorbent material contained within each sorbent material chamber,
• a shell, defining a heat transfer fluid chamber wherein each of the plurality of tubes is within the heat transfer fluid chamber,
• a manifold in fluid communication with the ullage space of a tank, wherein during operation, the sorbent material captures vapors that originated in the ullage space of the tank or releases fluids to the tank,
• a temperature control device for heating or cooling the thermal transfer fluid, and
• a thermal transfer fluid connection between the first VRU heat exchanger and the second VRU heat exchanger, wherein the thermal transfer fluid connection permits thermal transfer fluid to be exchanged between the first VRU heat exchanger and the second VRU heat exchanger,
• further comprising a thermal transfer fluid storage medium for storing and dispensing the thermal transfer fluid to the first VRU heat exchanger, the second VRU heat exchanger, or both.