Semi-water gas and shift gas MDEA synergistic desulfurization device

Abstract

The invention discloses a semi-water gas and shift gas MDEA synergistic desulfurization device. A desulfurization tower is composed of an upper desulfurization tower section and a lower desulfurization tower section, semi-water gas passes through a cold air inlet of a heat exchanger and an electric heater and then is connected with a detoxification tank, an outlet of the detoxification tank passes through a heat exchange pre-corroder and then is connected with an inlet of the heat exchanger, and an outlet of the heat exchanger is connected with an inlet of the lower desulfurization tower section; MDEA barren liquor and shift gas are respectively connected with a top inlet and a bottom inlet of the upper desulfurizing tower section, the desulfurized shift gas is discharged from an outlet of the upper desulfurizing tower section, a liquid outlet of the upper desulfurizing tower section is connected with a liquid inlet of the lower desulfurizing tower section, and a top outlet of the lower desulfurizing tower section is connected with a saturated section of the saturated hot water tower; and an outlet of the saturated section of the saturated hot water tower is connected with the heat exchange pre-corroder after being converged with water vapor, and the heat exchange pre-corroder is connected with the conversion furnace. The MDEA barren liquor can simultaneously remove gases such as hydrogen sulfide and the like, so that the process flow is simplified, process wastewater is not generated, the corrosion threat to mass transfer and heat transfer equipment after the sulfur-containing semi-water gas is humidified and heated by a saturated hot water tower is avoided, the CO2 loss can be effectively reduced, and a relatively high CO2 recovery rate is kept.

Description

technical field [0001] The invention relates to an MDEA synergistic desulfurization device for semi-water gas and shift gas. Background technique [0002] Sulfide is the main poison of methanol, ammonia synthesis, methanation and other catalysts. At present, the H contained in industrial semi-water gas 2 Sulfides such as S are generally removed by two sets of semi-water gas desulfurization and shift gas desulfurization devices, respectively, using alkali liquid phase catalytic process, which has prominent problems such as high power consumption, poor on-site sanitary conditions, difficult wastewater treatment, and high operating costs. Contents of the invention [0003] The invention provides a MDEA synergistic desulfurization device for semi-water gas and shift gas to overcome the defects in the prior art. [0004] In order to realize the purpose of the present invention, this semi-water gas and shift gas MDEA synergistic desulfurization device includes a desulfurizatio...

AI Technical Summary

Problems solved by technology

At present, the H contained in industrial semi-water gas 2 Sulfides such as S are generally removed by two sets of semi-water gas desulfurization and shift gas desulfurization by using alkali liquid-phase catalytic process respectively, and there are outstanding problems such as high power consumption, poor on-site sanitation conditions, difficult wastewater treatment, and high operating costs.

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