Heat transfer area of titanium cooler

Our capacity is 150,000 tons, with two 240 m2 cryocoolers

With a capacity of 200,000 tons, just one titanium cooler of 290 m2 is definitely not sufficient – in fact, it’s far from enough. I assume your design institute wouldn’t make such a basic mistake. Is there a brine heat exchanger in the preceding stage during the electrolysis process, used to preheat the brine with chlorine? Is the chlorine temperature reduced to around 60 degrees before it is sent to the chlorohydrogen process, with a chlorine water scrubber being used first to lower the temperature, and only then is it sent to this titanium cooler? With such a process, using a 290 m2 titanium cooler for cooling with chilled water in the final stage is more than sufficient. The key is to look at the cooling effect of the first two stages; in this way, it can actually be considered as two stages of titanium cooling.

The electrolysis cell does not have a brine cooler. It’s a simple process: chlorine goes to the scrubber tower, is cooled with titanium, and then passed through a water mist collector, with cooling using 7°C water. It doesn’t seem enough. It would be best if an expert could do the calculation. I’m not majoring in crafts. Thank you!

It must be due to the small size; the algorithm is based on the law of conservation of energy and mass balance

What kind of cooling is used for the circulating chlorinated water in the chlorine washing tower? If 7-degree cold water is also used, the temperature of the chlorine gas exiting the washing tower should be below 25 degrees, which should meet the requirements. I guess the manufacturer in question couldn’t design it that way – the energy consumption would be too high. How about constructing one with a area of 290 square meters instead?

This post was last edited by huawei on 2010-6-7 21:19. If the outlet temperature of the chlorine scrubber is below 40 degrees, the designed area of the titanium cooler is sufficient to meet the cooling requirements. I have done a simple calculation. A 200,000-ton titanium cooler requires only 131.613 square meters of heat exchange area. So 290 square meters is already enough. Details are as follows: Chiller load calculation table Chiller load calculation table Unit unit Entering the tower 1 ton caustic soda kilogram 886.729 Water content kilogram 148.151 80℃ water vapor saturated vapor pressure 47.4Kpa Composition of chlorine entering the tower Dry chlorine gas kilogram 886.729 kmol12.48914398 Other gases kilogram 13.503 kmol0.46563761 Moisture kg 148.151 kmol8.230593321 converted to 200,000 tons kg/h 25.000 kmol/h0.625 Dry chlorine kg/h 22168.231 kmol/h312.2285995 Other gases kg/h 337.587 kmol/h11.64094026 Moisture kg/h 3703.767 kmol/h205.764833 Scrubber air inlet kmol/h529.6343728 Water vapor saturated vapor pressure at 35℃ leaving the tower 5.62Kpa Moisture content kg 11.210 Gas composition dry basis chlorine kg leaving the tower 886.729 kmol12.48914398 Other gases kg 13.503 kmol0.517241379 Water content kg 11.210 kmol0.517241379 Water vapor cooling kg/h 3423.522 Solubility of chlorine at 50℃ kg/kg0.004 Lost chlorine kg/h13.437 The composition of the gas leaving the scrubber is dry chlorine kg/h 22154.793 kmol/h312.0393414 Other gases kg/h 337.587 kmol/h11.64094026 Moisture content kg/h 280.245 kmol/h15.56918264 339.2494643 Heat is brought into the gas phase of the scrubber: The specific heat of chlorine at 80℃ is kcal/kmol. ℃8.364 kJ/mol·k35.0183952 The thermal enthalpy of water vapor at 80℃ is kcal/kg 631.400 KJ/kg2643.54552 The specific heat of other gases at 80℃ is kcal/kmol. ℃6.900 KJ/mol·k28.88892 The heat kilocalories brought by dry chlorine gas is 208918.400 kJ874699.5591 The heat kilocalories brought by wet chlorine gas is 2338558.480 kJ9791076.645 The heat kilocalories brought by other gases is 6425.799 kJ26903.53535 The total heat kilocalories brought by the gas phase is 2553902.680 kJ10692679.74 The heat taken out of the scrubber. The specific heat of chlorine at 35℃ is kcal/kmol. ℃8.276 kJ/mol·k34.6499568 Thermal enthalpy of water vapor at 35℃ kcal/kg 611.200 KJ/kg2558.97216 The specific heat of other gases at 35℃ kcal/kmol. ℃6.900 KJ/mol·k28.88892 The heat kilocalories brought out by dry chlorine gas is 90385.316 kJ378425.2395 The heat kilocalories brought out by wet chlorine gas containing water is 171285.920 kJ717139.8886 The heat kilocalories brought out by other gases is 2811.287 kJ11770.29671 The heat kilocalories brought out by the chlorine water is 171847.951 kJ719493.0033 The total heat kilocalories brought out by the gas phase is 436330.474 kJ1826828.428 The heat kilocalories taken away by the chlorine water spray is 2117572.206 kJ8865851.312 Calculation of chlorine water spray volume kg/h162890.170 m3162.8901697 The diameter of the circulating chlorine water pipe is m0.196 The diameter of the round pipe is DN125m0.125 3. Calculation of chlorine water plate heat exchanger 1. Calculate the area of chlorine water plate heat exchanger The average temperature difference of the plate heat exchanger is ℃ 5.279. Take k2500.000 10467 Area of heat exchanger m2160.441 160.4412079 Amount of circulating water kg529393.051 m3529.3930515 Pipe diameter of circulating water m0.353 Take the pipe diameter as DN219m0.200 Calculation of titanium cooler 1. Heat balance: The temperature entering the cooler is 40°C, the temperature leaving the cooler is 12°C, the temperature of chlorine water is 15°C, the heat brought by the gas phase components into the cooler is kilocalories 264482.522 kJ1107335.425, the saturated vapor pressure of water at 12°C is 1.71KPa, the water content of caustic soda chlorine gas per ton kg3.325 The water content of 50,000 tons of chlorine is kg/h83.124. The solubility of chlorine at 15℃ is kg/kg0.008. The loss of chlorine is kg/h1.675 kmol/h0.02358513. The amount of chlorine water generated is kg/h198.796. The heat brought out by the gas phase cooler is the specific heat of chlorine at 12℃, kcal/Kmol.℃ 8.214 kJ/mol·k34.3903752 Thermal enthalpy of water vapor kcal/kg 602.600 KJ/kg2522.96568 Specific heat of other gases kcal/Kmol.℃ 6.900 kJ/mol·k28.88892 Dry chlorine gas of titanium air conditioning kilogram/hour 22153.119 kmol/h312.0157563 Other gases kg/h 337.587 kmol/h11.64094026323.6566965 Moisture content kg/h 83.124 kmol/h4.618007223 Heat kcal brought out by dry chlorine gas 30754.769 kJ128764.067151.15366254 Wet chlorine gas contains water and brings out heat kilocalories 50090.601 kJ209719.3272 Other gases bring out heat kilocalories 963.870 kJ4035.53030220.46146502 Chlorine water brings out heat kilocalories 2981.936 kJ12484.767662.557683127 The total heat kilocalories brought out by the gas phase is 84791.175 kJ355003.692362.663 The heat kilocalories brought out by Lengdong water is 179691.347 kJ752331.7325 is equivalent to 208.981KW114.6627 Hot spray volume of sulfuric acid dilution in drying tower m3/h50.000 KG/H114.662665 Heat released by sulfuric acid dilution kcal/h114662.665 kw133.199795855.55555556 kw89.4108205847619.04762 Total load kw431.5916532561.0691492 Calculation of heat exchange area of cooler 133.3271988 Chilled water supply temperature ℃ 7.0 89.41082058 Return water temperature 11 ℃ 11.0 208.9810368 Inlet chlorine temperature of titanium cooler ℃ 40.0 431.7190562 The outlet temperature is ℃12.0 123.3119009561.234773 The average temperature difference is ℃13.6529805769.90378 Take K1006.568709054 The area of the heat exchanger is 131.613 Calculation of the chilled water consumption of the cooler. The amount of cold east water is kg/h44922.837 m3/h44.9228368. The cold east water pipe diameter is 0.102944199678.4426456. The rounded pipe diameter is 0.8. The acid pipe diameter is calculated. The acid flow rate is m3/h50.000. The pipe diameter is m0.109. The rounded pipe diameter is m0.125. Supplementary acid amount dm3/h100.000 Pipe diameter m0.005 0.108605869 Rounded pipe diameter is m0.025 Sulfuric acid heat exchanger calculation 1.1 Sulfuric acid drying tower sulfuric acid exchange heat kcal/h 136733.286 kJ/h 574279.8025 Chilled water inlet ℃ 8.0 Outlet temperature ℃ 11.0 Specific heat of water kcal/Kg.℃ 1.0 Amount of cooling water kg/h45577.8 m3/h45.57776211 Flow rate of cold east water m/s1.5 Chilled water pipe diameter m0.104 Round pipe diameter is m0.065 Ⅰ Area calculation of sulfuric acid plate heat exchanger in packed drying tower Sulfuric acid inlet temperature ℃ 16.0 Outlet temperature ℃ 12.0 The average temperature difference ℃ is 4.481. Take the heat transfer coefficient K1500. The area of the heat exchanger is m220.341. Calculate the diameter of the chlorine pipe entering the chlorine scrubber. Under the standard gas condition (1atm, 0℃), 1 kilogram molecule is equal to 22.4m3 of gas. The number of moles of chlorine entering the tower per hour is. The standard air inlet volume of the scrubber is m3/h11863.810. The chlorine gas temperature before the scrubber is ℃80.000. Pressure kpa-0.5 Actual air inlet volume of scrubber m3/h15414.540 Flow rate of chlorine gas m/s12.000 Diameter of chlorine main pipe m0.674 Take DNm350.000 8. Calculate the outlet diameter of scrubber tower gas standard flow rate m3/h7599.188 Outlet temperature ℃40.000 Pressure kpa-1.5 Actual flow rate m3/h8842.920 Flow rate m/s10.000 Pipe diameter m0.559 Rounded pipe diameter is m0.300

There is a washing tower ahead, and the space is sufficient. It’s just that the margin is a bit smaller.

The titanium cooling area of the original poster is a bit small; with your drying system, a facility of 200,000 tons in capacity should require around 330 square meters.