System and method for regenerating active coke

Abstract

The invention belongs to the field of chemical engineering, and discloses a system and a method for regenerating active coke. The system for regenerating active coke comprises a regeneration tower anda regeneration fan, and the regeneration tower is sequentially provided with a feeding distribution section, a preheating section, a regeneration tail gas extraction section, a heating section, a redistribution and activation section, a cooling section and an outlet collection section from top to bottom. A process flow of circulating the regeneration tail gas to the bottom of the heating sectionis adopted to generate new oxygen-containing and nitrogen-containing functional groups on the surface of the active coke and improve the desulfurization and denitrification performance of the active coke; the flow and composition stability of regeneration tail gas can be guaranteed, the flow and the SO3 content of the regeneration tail gas can be reduced, the SO2 concentration is improved, the salt deposition temperature of a regeneration tail gas system is reduced, and the salt deposition tendency is reduced, so stable operation of a downstream regeneration tail gas treatment system is facilitated; and the process flow is simple, and is safe and reliable to operate, so the stability and reliability of the active coke regeneration technology are improved.

Description

technical field [0001] The invention belongs to the field of chemical industry, and more specifically relates to an active coke regeneration system and regeneration method. Background technique [0002] The activated coke dry flue gas purification process began to be applied industrially in the 1980s. With the increasing environmental protection requirements, activated coke dry purification technology has attracted more and more attention due to its outstanding advantages such as high desulfurization efficiency, no water consumption in reaction, no waste water and residue discharge, and equipment corrosion problems. widely. [0003] Typical activated coke dry purification includes two parts: adsorption and regeneration, both of which are moving bed. In the adsorption part, the activated coke is in contact with the flue gas, and the SO in it is adsorbed 2 and convert it to H 2 SO 4 stored in the pores of the active coke. When the adsorption tower sprays ammonia for deni...

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Problems solved by technology

At the same time, in order to ensure that the regeneration tail gas flows downward with the active coke in the heating section, it is necessary to introduce more sealed nitrogen gas at the top of the regeneration tower to increase the flow rate of the regeneration tail gas and reduce the SO 2 Concentration, which will adversely affect the downstream regeneration tail gas treatment system;

[0008] (3) A certain amount of SO will be produced during active coke regeneration 3 , since the regeneration tail gas outlet is located in the lower part of the heating section, which is the area with the highest active coke temperature, SO 3 Directly enter the regeneration tail gas, which brings difficulties to the downstream regeneration tail gas treatment system

Meanwhile, SO 3 Will interact with NH in regeneration exhaust gas 3 The reaction generates ammonium (hydrogen) sulfate, and there is a risk of blockage of the regeneration pipeline system;

[0009] (4) Since the regeneration tail gas is directly extracted from the high temperature section, more activated coke fine powder is produced at high temperature, resulting in a higher content of coke powder in the regeneration tail gas;

[0010] (5) The operating temperature of the regeneration tail gas is as high as 350-400°C, which affects the long-term stable operation of the regeneration fan

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