Method for recovery of pressure energy in ethylene plant
A pressure and energy technology, applied in the field of pressure energy recovery in ethylene plants, can solve the problems of high power and electricity costs and high energy consumption
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Embodiment 1
[0033] Taking the 115,000-ton / year ethylene plant of the production scale as an example, a method for recovering pressure energy of the ethylene plant of the present invention is adopted, such as figure 1 As shown, the process flow is as follows: the quenched and compressed cracked gas 11 flowing out from the ethylene cracking furnace outside the boundary enters the bottom of the absorption tower 1, and the low-temperature lean liquid absorbent 23 after the temperature is reduced and the pressure is increased enters the top of the absorption tower 1 , in the absorption tower 1, the cracked gas 11 is in countercurrent contact with the low-temperature lean liquid absorbent 23, the acid gas hydrogen sulfide H2S and carbon dioxide CO2 in the cracked gas 11 are absorbed by the low-temperature lean liquid absorbent 23, and the purified cracked gas is removed from the acid gas 12 flows out from the top of the absorption tower 1 and sends it out of bounds. The high-pressure rich liqui...
Embodiment 2
[0040] Same as [Example 1], only the production scale is changed to 300,000 tons / year ethylene plant, the cracking raw material is changed to 100% heavy naphtha, and the composition of the cracked gas entering the separation unit is changed accordingly, as shown in Table 3.
[0041] The cracked gas composition list of table 3 separation unit
[0042] component name methane hydrogen carbon dioxide Vinyl carbon two Propylene carbon three carbon four heavy component total Yield / wt% 14.00 0.15 19.90 3.10 12.00 0.10 8.10 42.65 100.00
[0043] The process parameters are as follows: the cracked gas 11 entering the bottom of the absorption tower 1 contains acid gas carbon dioxide CO2 with a mass fraction of 0.15%; the purified cracked gas 12 flowing out of the top of the absorption tower 1 contains acid gas carbon dioxide CO2 The mole fraction is ≤ 2.0ppm. The operating pressure of absorption tower 1 is 1.9MPa, the operating temperature at...
Embodiment 3
[0046] Same as [Example 1], except that the production scale is changed to 700,000 tons / year ethylene plant, the cracking raw material is changed to 100% ethane, and the composition of the cracked gas entering the separation unit is changed accordingly, as shown in Table 4.
[0047] The cracked gas composition list of table 4 separation unit
[0048] component name methane hydrogen acid gas Vinyl carbon two Propylene carbon four heavy component water total Yield / vol% 38.39 0.19 31.51 24.54 0.76 0.18 0.09 4.34 100.00
[0049] The process parameters are as follows: the cracked gas 11 entering the bottom of the absorption tower 1 contains acid gas hydrogen sulfide H S and carbon dioxide CO The mole fraction is 0.19%; the purified crack gas 12 flowing out of the top of the absorption tower 1 contains acid gas hydrogen sulfide H S and carbon dioxide CO The score is ≤ 2.0 ppm. The operating pressure of absorption tower 1 is 2.0MPa, the ...
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