Calcining kiln flue temperature monitoring explosion-proof system

Abstract

The invention discloses a temperature monitor for flue duct and explosion protection system, especially temperature monitor for flue duct and explosion protection system of carbon furnace. The temperature of main points in flue duct of furnace is displayed on the displayer in time and indication of trouble state and temperature setting so on are realized as equidistance multipoint measure temperature apparatus is designed in plant duct; meanwhile once overtemperature signal appears it is sent to PLC control system for gas purification out of workshop by A / D transferring and PLC controller, and it is realized by PLC control system for gas purification out of workshop that high temperature alarming, high pressure valve controlling, ventilating butterfly valve switching, temperature decreasing and fire fighting so that ultra-high temperature smoke does not appear, the possibility for firing by smoke is decreased, the safety and efficiency of equipment is improved and productive environment in workshop is improved largely.

Description

technical field [0001] The invention relates to a temperature monitoring system, in particular to a carbon roasting furnace flue temperature monitoring and explosion-proof system. Background technique [0002] The raw materials used in aluminum anode factories, cathode factories, graphite electrode factories and other carbon factories are mainly petroleum coke and pitch. In the high temperature state, the roasting workshop completes the roasting of the green carbon block formed by vibration into a qualified cooked carbon block. The temperature of raw carbon block is 200-1200°C during the roasting process, and a large amount of roasting flue gas is released during this process. The main components of the roasting furnace flue gas are asphalt fume, tar and various combustible dust, and the flue gas outlet temperature is as high as 900°C. At high temperature, these flue gases must be removed from the flue in time, otherwise it is easy to overheat and burn, and even cause an ex...

AI Technical Summary

Problems solved by technology

At present, many manufacturers have experienced flue gas combustion or explosion accidents in the flue. There are three main reasons: one is due to the raw materials and formula for making carbon blocks, which release too much smoke and dust during combustion, and the other is fuel addition. The amount and speed of addition are unstable, resulting in unstable flue gas temperature and local ultra-high temperature; third, the temperature monitoring of the purification system is not comprehensive, the temperature monitoring system is not chained with related systems, and the response is not timely

For example, many manufacturers have installed multiple sensors from the exit of the roasting workshop to the dust collector for the safety of their own equipment when making the flue gas dust removal system, so that when the system has abnormal overtemperature or fire alarms, corresponding measures can be taken in time, but for many years The effect of actual use and the comprehensive analysis of the fire situation of individual manufacturers. Once a fire occurs, the damage and the size of the loss are directly related to the distance between the fire source and the purification system, and the length of the flue in the workshop is often There are more than 100-200 meters, so objectively, the sensitivity of the system to fire alarms is greatly reduced

The temperature monitoring that comes with the purification system has many problems such as incomplete function and slow response. Therefore, it is necessary to improve and expand the function of the temperature monitoring module that comes with the purification system, and increase the monitoring of the flue temperature in the workshop.

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