Air volume control device and method for mercury catalyst drying systems

Abstract

The invention discloses an air volume control device and method for mercury catalyst drying systems. The device comprises a sedimentation system, the drying system A and the drying system B, wherein the drying system A and the drying system B are arranged in a parallel connection mode. The drying system A is composed of an air blower A, an electric hot air furnace A, a drying furnace A and a pre-drying furnace A, wherein the air blower A, the electric hot air furnace A, the drying furnace A and the pre-drying furnace A are sequentially connected, and the outlet end of the pre-drying furnace A is connected with a draft fan A. The drying system B is composed of an air blower B, an electric hot air furnace B, a drying furnace B and a pre-drying furnace B, wherein the air blower B, the electric hot air furnace B, the drying furnace B and the pre-drying furnace B are sequentially connected, and the outlet end of the pre-drying furnace B is connected with a draft fan B. The outlet end of the draft fan A and the outlet end of the draft fan B are connected with the sedimentation system. The air volume control method mainly comprises the steps of air suction, air volume control during the earlier drying period and air volume control during the later drying period. According to the air volume control device and method, by adjusting the air volume, moisture in a mercury catalyst can be slowly removed, good adsorption of mercuric chloride in active carbon can be kept, the product quality can be improved, the total mercury emission can be decreased, the power consumption can be lowered, and therefore good economic and social benefits can be achieved.

Description

technical field [0001] The invention belongs to the technical field of mercury catalyst production, and in particular relates to a mercury catalyst drying system air volume control device and a control method thereof. Background technique [0002] At present, most of the drying process in the production of mercury catalysts relies on blowers to send air into the electric furnace for heating to obtain high-temperature gas. The top of the drying furnace comes out, so that the tail gas coming out of the drying furnace shares a 15KW induced draft fan with the tail gas of another drying system, and the tail gas is introduced into the sedimentation system for dust removal and then discharged up to the standard. [0003] The above-mentioned drying system mainly has the following disadvantages in the actual application process: (1) Due to the large air volume of the fan, and the two sets of drying systems share one fan, the degree of dryness and humidity of each drying furnace is di...

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Problems solved by technology

[0003] The above-mentioned drying system mainly has the following disadvantages in the actual application process: (1) Due to the large air volume of the fan, and the two sets of drying systems share one fan, the dryness and humidity of each drying furnace are different, resulting in different resistance and forming a bias flow; (2) Since the mercuric chloride in the mercury catalyst is HgCl before drying 2 ·H 2 The O form exists in the pores of activated carbon, so changes in temperature and airflow in the initial stage are most likely to cause mercury chloride to be decomposed with water, partly adsorbed on the surface of activated carbon, and partly lost with water vapor, which not only affects power consumption and baking Time and product quality will also increase the total amount of heavy metal pollution emissions, causing great harm to the human body and the environment

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