On-line Monitoring System for Residual Oxygen Content in Acid Regenerative Roaster

Abstract

The invention relates to a system for monitoring the content of residual oxygen in an acid regeneration calcinator on line. The system comprises a measurement system, a signal conditioning and data processing system and a terminal treatment system, wherein the measurement system consists of a condensation device, a measurement chamber I, a de-acidifying device, an oxygen sensor, a measurement chamber II and a suction pump, which are connected with one another through a gas pipeline; the signal conditioning and data processing system consists of a filter and amplification unit, a signal input unit, a singlechip microcomputer and a DA (digital / analog) converter, which are connected with one another in sequence; the terminal treatment system consists of a PLC (programmable logic controller) and an upper computer; after multiple paths of signals are conditioned and processed by the singlechip microcomputer, data enters the upper computer through the PLC for performing terminal treatment of online monitoring on oxygen concentration. Compared with the prior art, the system has the beneficial effects that the oxygen content can be measured in a high-temperature corrosive gas environment, a circuit system is directly connected with a gas sampling and sensing unit, the reaction time of the system is shortened, and the protection on measurement elements and the requirement on environment protection are satisfied by an acid-base neutralization filter device.

Description

technical field [0001] The invention relates to the technical field of oxygen content monitoring in industrial production, in particular to an online monitoring system for residual oxygen content of an acid regeneration roaster. Background technique [0002] In the production process of hydrochloric acid regeneration by spray roasting method in the metallurgical industry, the core equipment of the acid regeneration unit is the roaster, which burns natural gas and air in the furnace, and the main components of the combustion waste gas are HCL (gas), N2, H2O (gas), CO2 Wait. [0003] The temperature of the burner chamber of the roaster is between 1000 and 1200 ° C. The combustion gas is composed of gas and combustion air. The ratio of gas and combustion air is called the air-fuel ratio. If the air-fuel ratio is not properly proportioned, it may cause an explosion. Therefore, on-line monitoring of the oxygen content in the combustion exhaust gas of the roaster is a necessary m...

AI Technical Summary

Problems solved by technology

It is difficult to accurately control the full combustion of gas and air by the manual empirical ratio measurement method. If the air coefficient is too large, the reaction temperature in the roaster is not enough, the waste acid cannot be completely oxidized and decomposed, and the quality of the produced iron oxide powder is unqualified; if the air coefficient is too small, It causes incomplete combustion, wastes energy and is prone to gas explosion

The mechanical connection parts of the semiconductor laser measurement method are not resistant to corrosion and high-temperature furnace gas, and require pre-treatment of the sample gas, which is costly; the zirconia sensor is not resistant to corrosion, and its working temperature is higher than 600°C, and the heating gas will cause the unit to operate normally. bring security risks

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