Combined method for removing trace nitrogen

Abstract

The invention relates to a combined method for removing trace nitrogen, a steam injection system is arranged at the bottom of a fractionating tower, and a flow divider is arranged at the top of the fractionating tower; an oil outlet of the stabilizing tower is provided with two connecting lines, the first connecting line is connected with an outlet device to output stable gasoline, and the first connecting line is provided with an online analyzer and a first regulating valve and used for monitoring the nitrogen content of the gasoline in the first connecting line and monitoring the flow of the first connecting line; a second connecting line is connected with a flow divider at the top of the fractionating tower, and a second regulating valve and a flow meter are arranged on the second connecting line and used for monitoring and regulating the flow of the second connecting line; the online analyzer, the regulating valve and the flow meter are all connected with a PLC automatic control system to form a regulating system, and the denitrification effect is controlled by controlling the flow through the regulating valve. According to the invention, the emission of pollutants is not increased, the energy consumption is not increased, the nitrogen content in the gasoline at the bottom of the stabilizing tower is reduced from 3ppm to 0.5 ppm or below, the energy is saved, the environment is protected, and the enterprise benefit is improved.

Description

technical field [0001] The present invention relates to a method for denitrification, and more specifically, relates to a method for combined removal of trace nitrogen. Background technique [0002] At present, the process of hydrogenation desulfurization first, and then absorption and stabilization is adopted. The rich gas and liquefied gas are desulfurized by N-methyldiethanolamine. The nitrogen content in the bottom oil exceeds the standard, and the nitrogen content in this part will be enriched to about 3ppm, which cannot be removed through physical separation or distillation, which will greatly affect the subsequent processing technology. Contents of the invention [0003] In order to overcome the shortcomings of the above-mentioned technical problems, the present invention provides a combined method for removing trace nitrogen. [0004] The combined method for removing trace nitrogen of the present invention is used to remove the residual amine liquid in the gasolin...

AI Technical Summary

Problems solved by technology

[0002] At present, the process of hydrodesulfurization first, and then absorption and stabilization is adopted. The rich gas and liquefied gas are desulfurized by N-methyldiethanolamine. After desulfurization, the rich gas and liquefied gas are carried by a small amount of amine liquid, which is enriched during absorption and stability, resulting in stability. The nitrogen content of the bottom oil exceeds the standard, and the nitrogen content of this part will be enriched to about 3ppm, which cannot be removed by physical separation or distillation, which will have a great impact on the subsequent processing technology

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