Collecting, purifying and recovering system and method for head space gases in storage tank areas
A storage tank area, top gas technology, applied in chemical instruments and methods, separation methods, gas treatment, etc., can solve the problems of high concentration at the discharge port, low absorption efficiency of light hydrocarbons, and purification efficiency that cannot stably meet the requirements of emission standards. , to achieve the effect of enhancing the desorption effect, saving the cost of waste gas treatment, and increasing the overall stability and reliability
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Embodiment 1
[0036] Attached figure 1 The treatment system is used to treat the breathing gas produced by the benzene storage tank farm, and the concentration of benzene in the exhaust gas on the top of the tank is 2.2×10 4 mg / m 3 .
[0037] The tank area is equipped with a nitrogen supplement pipeline. When the pressure on the top of the tank is lower than 50PaG, nitrogen supplement is started; when the pressure reaches 150PaG, nitrogen supplement is stopped. When the tank top pressure reaches 1200PaG, the remote switch valve is opened, and the exhaust gas in the tank enters the summarizing pipeline; when the exhaust gas pressure in the summarizing pipeline reaches 1100PaG, the liquid ring compressor is started to transport the exhaust gas to the adsorption separation device. Fill 10% alumina, 20% silica gel, 50% macroporous activated carbon, and 20% molecular sieve from the inlet to the outlet of the adsorption tank. The pore diameter of alumina is 50nm, the pore diameter of silica ge...
Embodiment 2
[0041] Attached figure 2 Said treatment system, the treatment pollution source is the waste gas from the top of the tank area of the waste oil tank, and the concentration of hydrogen sulfide in the waste gas is 1000mg / m 3 , the organic sulfide is 150mg / m 3 , non-methane total hydrocarbon concentration 4.2×10 5 mg / m 3 .
[0042] The difference from Example 1 is that the exhaust gas first enters the pretreatment device 7 for desulfurization, and the desulfurization is treated by low-temperature diesel absorption + desulfurizer. Straight-run gas oil is used for diesel absorption, the initial boiling point is 190°C, the absorption temperature is 10°C, the volume ratio of absorbent to diesel is 1:0.05; the desulfurizer is 30wt% N-methyldiethanolamine (MDEA). The volume ratio is 0.1.
[0043] After desulfurization treatment, the exhaust gas enters the adsorption separation equipment, and is filled with 5% alumina, 20% modified silica gel, 60% microporous activated carbon, an...
Embodiment 3
[0047] The treatment process and operating conditions are the same as in Example 2, except that the height of the adsorption zone is 60% of the filling height, and the switching time of the adsorption tower is 10 minutes. After 10 adsorption regeneration cycles, the concentration of benzene in the purified gas at the outlet of the adsorption tower is less than 4mg / m 3 , toluene concentration 3 , xylene concentration 3 , non-methane total hydrocarbon concentration 3 .
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