1 cylinder
2 upper dished bottom
3 lower dished bottom
4 pressure Transmitter
5 insulation
6 upper coiled tubing
7 lower coiled tubing
8th intermediate medium / propane
8.1 intermediate medium gaseous condensing / propane-saturated steam,
8.2 intermediate medium / propane, liquid or boiling
9 level of the liquid intermediate medium 8th in the boiling state,
10 inflow of LNG, e.g., to the coiled tubing 6, and outflow of regasified LNG
11 safety valve
13 for emptying and filling with intermediate medium / propane
14 inflow and outflow of cooling agent through the coiled tubing 7
1 cooling agent, CO₂
2 cold consumer
3 LNG inlet
6 replacement chiller, conventional, electrically driven
12 intermediate medium, propane, natural circulation, heat transfer by evaporation and condensation
Operating data
• LNG taken from the storage tank and after pressure boosting, at 80 bar and -130 °C with mass flow rate 99560 kg/h, which corresponds to 126000 m³/h natural gas at 1 bar and 0°C
• heat transfer from the liquid cooling agent CO2 (from -40 °C to -50 °C) via intermediate medium propane (at -55 °C, 0,5 bar) to LNG, which is regasified up to -65 °C
• the available cooling capacity is 7800 kW.
Operating data
• LNG taken from the storage tank at 8,5 bar and -127,5 °C with massflow rate 1247 kg/h, which corresponds to 1580 m³/h natural gas at 1 bar and 0°C
• heat transfer from liquid brine (ethylene glycol/water), which is used as cooling agent and is cooled down from -15 °C to -20°C, via intemediate medium propane at -30 °C and 1,68 bar to LNG, which is regasified up to -35 °C
• the available cooling capacity is 223 kW
1 cooling chamber air
5 heat transferring intermediate medium
9 pipe-bundle heat exchanger
(having a floating head and two mantle paths)
14 LNG inlet
15 gasified LNG outlet
21 protective pipe (coaxial to the LNG-carrying pipe)
22 dry gas as a hermetically sealed protective gas
The REGASCOLD heat exchanger device enables to supply the cold storage chamber, which is placed on the semitrailer, with the required refrigeration.Typical operating data:
• withdrawal from LNG tank to produce
100 kW engine power: 19,6 kg/h at -135 °C
• regasification by heat transfer from first cooling agent, the cooling chamber air (- 45 °C), via second cooling agent, the liquid intermediate medium, and via the gas layer as a hermetically sealed protective gas and a thermal resistance
• available cooling capacity is 3,3 kW
The development of a preliminary application,
„REGASCOLD-Logistic“ by means of LNG powered trucks,
has been supported by ESF Europäischer Sozialfonds
see under Basic
1 tube-in-tube heat exchanger (u-type tubes)
2 inner tube
3 outer tube
4 tube sheet
5 cryogenic liquefied gas inlet
6 regasified liquefied gas outlet
7 cooling agent inlet
8 cooling agent outlet
The air heated vaporizer, which has been used before to regasify liquid oxygen, now, in order to recover cooling capacity, is replaced by the REGASCOLD heat transfer system.
Oxygen withdrawal from cryogenic storage tank:
liquid oxygen LO₂, – 147 °C, 53 kg/h, resp. 0,06 m³/h, which after regasification supplies 38 m³/h gaseous oxygen O₂ (1 bar; 0 °C) to the foundry.
Result of replacing the air heated vaporizer:
recovery of 4,8 kW cooling capacity for the air conditioning of the factory workshop.