Online dilute sulfuric acid concentration control device in chlorine drying process based on DCS control system

Abstract

The invention relates to an online dilute sulfuric acid concentration control device in a chlorine drying process based on a DCS control system. The device comprises a concentrated sulfuric acid elevated tank, a packing drying tower, a bubble cap drying tower, a dilute sulfuric acid circulating pump and a dilute sulfuric acid cooler. An acid discharging control valve and an acid discharging flow meter are arranged on an acid discharging pipeline of the concentrated sulfuric acid elevated tank, the packing drying tower is provided with a liquid level sensor, and a sulfuric acid densimeter and an acid discharging adjusting valve are arranged on a dilute sulfuric acid discharging pipeline. The acid discharging adjusting valve is electrically connected with the liquid level sensor, the sulfuric acid densimeter is electrically connected with the overhead tank acid discharging control valve and the acid discharge flow meter, and the sulfuric acid densimeter, the acid discharging adjusting valve, the overhead tank acid discharging control valve, the acid discharging flow meter and the DCS form a control loop. On the basis of a DCS, a control loop is formed by the online density and the flow through a certain logic relationship, so that the consumption of concentrated sulfuric acid is reduced, the manual sampling frequency is reduced, the energy is saved, the consumption is reduced, and the safety and environmental protection risks are effectively reduced while fine control is realized.

Description

technical field [0001] The invention relates to a chlorine gas drying device in the chlor-alkali industry, in particular to an online control device for dilute sulfuric acid concentration in the chlorine gas drying process based on a DCS control system. Background technique [0002] At present, in the chlorine gas drying process, the acid in the high tank is manually controlled by the acid valve, and the amount of acid can only be adjusted manually, and the automation level is low; the discharge of dilute sulfuric acid is also manually controlled, and the concentration of dilute sulfuric acid It can only rely on manual analysis, the reaction is lagging, and there are safety and environmental risks when sampling. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide an online control device for the concentration of dilute sulfuric acid in the chlorine drying process based on the DCS control system. The online density an...

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Problems solved by technology

[0002] At present, in the chlorine gas drying process, the acid in the high tank is manually controlled by the acid valve, and the amount of acid can only be adjusted manually, and the automation level is low; the discharge of dilute sulfuric acid is also manually controlled, and the concentration of dilute sulfuric acid Can only rely on manual analysis, the response is lagging, and there are safety and environmental risks when sampling

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