Application background:
As more and more steel plants are processed, a large amount of dust and flue gas will be generated during the production process, which will cause serious pollution to the atmosphere and human body. Therefore, the state has formulated strict requirements for the atmospheric emissions of such enterprises, while The bag filter is an ideal dust removal method that is widely used. The dust bag is called the heart of the bag filter and plays a very important role in the dust removal effect. The converter will generate a large amount of primary flue gas during the steelmaking process. The commonly used purification process is the OG wet method. At present, the coal gasification purification and recovery system of the two 150-ton converter primary dust collectors in the Second Steelmaking Plant of WISCO adopts this method. From the perspective of operation, regardless of operating cost, environmental impact, dust removal effect, labor occupation, energy recovery, etc., the principles of energy saving, emission reduction, cost reduction and efficiency increase cannot be met, and the national and local people will not be able to achieve. Special limit emission standard requirements. At the same time, a large amount of steelmaking sludge produced by wet dust removal is difficult to handle, and secondary pollution is generated during transportation and use, which has serious constraints and impacts on the transformation and upgrading of enterprises in the current severe form. .
On-site requirements:
In modern smelting and dust removal, the site environment is relatively harsh. It is particularly important to establish a control system with process level and operation level. In the automatic control system of dust removal in steel mills, it is required to monitor the site pressure, temperature and pressure difference, which is mainly used for monitoring The remote detection instrument for the air pressure difference at both ends of the filter can monitor the timely data of positive pressure, negative pressure, differential pressure and bidirectional pressure of non-corrosive gases through the air pressure transmitter, and is equipped with a pitot tube pressure taking device. It can realize the calculation and detection of wind speed and air volume. Secondly, the temperature value in the air duct determines the valve opening, the operation of the on-site motor, and the real-time monitoring of the valve switching state, and centrally manages the pressure difference, pipeline pressure, temperature, and other data. Analyze on-site operating status, transmit test data to data management center, system real-time data collection, real-time data and historical data display, curve, on-site alarm, etc., and automatically control solenoid valves through correlation to ensure the safe operation of the overall equipment
system structure
An Introduction:
Use JYB-KO-PAGZG series pressure sensor, JWB/PT100/C series temperature sensor, JYB-3151 differential pressure sensor, isolation module KLP-3111, CH6 instrument, all output signals to the field instrument CH6 display, then KLP-3111 isolate. It is transmitted to Siemens PLC module, and the control software can realize special functions: multi-pump switching, manual/automatic switching, bypass function, detection of broken belt and water shortage, energy-saving operation mode, etc. Robust EMC design; fast response to control signals; linear v/f control with Flux Current Control (FCC) for enhanced motor dynamic response and control characteristics, multi-point v/f control; built-in PID controller; fast current Limit to prevent unnecessary tripping during operation; Integrated RS485 communication interface. It is transmitted to the central control system, and the software adopts force control, which has real-time data, historical data, curve query and other functions, and can control the field equipment in real time.
Product advantages:
The on-site display of the pressure sensor JYB-KO-PAGZG is convenient for direct observation, and the JYB-3151 small-range differential pressure sensor is stable in use and can adapt to the changes in the small pressure of the customer's on-site gas. After the sensor signal passes through the isolation module KLP-3111, the interference of the high-power motor on site is eliminated, the on-site signal is stable, and the CH6 instrument in the control room is displayed, and the overall cost-effectiveness is high.
Live pictures
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