With the improvement of refined management level of cement production enterprises and stricter cost control, cement production enterprises focus on energy saving on the firing system and grinding system, paying less attention to other production links. In the cement production process, the energy-saving potential of each piece of equipment and each production link should be explored. For example, more accurate metering equipment should be used to stabilize the cement production batching process during the production process, thereby stabilizing the process stability of the entire production system and reducing human intervention. Adjustments in the production process cause unnecessary waste of energy, stabilize the thermal system, and improve the quality of clinker and cement.
Metering control in cement production
Cement production is a dynamic and continuous process. Especially with the development of modern industrial technology and the continuous improvement of the automation level of the production process, the control requirements for the production process are becoming more and more complex and strict. The measurement of various raw materials and finished products of cement enterprises The feeding device puts forward higher requirements, which not only require accuracy and reliability, but also respond to the control system in a short time to improve the stability of the feeding. At present, the measuring equipment commonly used in new dry process cement plants can be roughly divided into three categories according to their uses:
1. For batching measurement: The various raw materials constituting raw meal or cement are mixed into the mill according to the set proportion, and the flow of various materials is adjusted and controlled in a timely manner with the help of the control system to meet the requirements of production quality performance indicators and cement labels. and breed requirements. Most of the ingredients are used for measuring solid materials. Commonly used equipment include quantitative feeders, belt scales, and spiral weighing scales for adding fly ash and slag powder during the cement production process.
2. Measurement of various materials in the production process, such as truck scales used in and out of the factory, belt weighing feeders on measuring stations, and the use of weighing sensors under the warehouse to measure various load-bearing warehouses, bulk warehouses, and bulk warehouses. Cement metering equipment.
3. More accurate metering equipment is required for raw materials and pulverized coal feeding into the kiln to achieve accurate measurement, timely adjustment and stable feeding of raw materials and pulverized coal entering the kiln. The raw meal feeding adopts Coriolis raw meal powder weighing and feeding equipment, and a flow control valve is installed in the discharge chute at the bottom of the warehouse. The pulverized coal measurement adopts the Coriolis pulverized coal weighing and feeding system.
The role of measuring equipment in cement production
General metering equipment can only be designed to be accurate when the material flow is stable, but conversely, our original intention of installing metering equipment is to feed back the stability of incoming materials through the accuracy of metering. Only when the two complement each other can stable cement process production be achieved.
The homogenized raw meal is discharged from the raw meal homogenization warehouse, enters the inflatable metering bin through the electronically controlled pneumatic flow valve at the bottom of the warehouse, and is discharged by controlling the opening of the electronically controlled pneumatic flow valve according to the amount of feed into the kiln. , and then through the transportation of the air chute and the measurement of the Coriolis raw meal powder weighing feeder, it is lifted by the kiln entry elevator to the kiln end frame, and enters the kiln end preheater to complete the process of raw meal from the warehouse to the kiln. the whole process. Among them, the Coriolis raw meal powder weighing feeder is installed at the entrance of the elevator, and the flow rate of the raw meal entering the kiln is controlled by metering feedback to adjust the flow valve. The current fluctuation of the elevator entering the kiln is large, which will seriously affect the stability of the kiln system and increase the difficulty of operating the coal feeding system. The stability of the metering equipment reduces frequent adjustment operations and stabilizes the thermal system of the kiln system, which has significant effects on improving clinker output and quality as well as energy conservation and emission reduction. After using accurate metering equipment, the raw materials entering the kiln are stable, the kiln thermal power is significantly improved compared to before, the clinker qualification rate and clinker strength out of the kiln are greatly improved, the coal feeding system is stable, and the coal consumption per ton of clinker is saved by about 3kg.
Ultra-fine fly ash or slag powder can be fed stably using a double-layer rotor weighing feeder, which has a better effect on later clinker firing or cement homogenization, improving the stability of the firing system and the quality of cement.
The amount of materials entering the kiln and grinding during the cement production process is directly related to the material balance of the system, and the material balance determines the heat balance of the system. The two complement each other. Metering is an important part of cement production. Stable and accurate metering equipment can improve the stability of ingredients, ensure the balance of the thermal system of the production line, and improve the production quality of cement clinker. Cement production companies should pay equal attention to measurement, firing and grinding systems.
The measurement and control system of powder materials is an organic whole. On the basis of manufacturing precision measurement equipment, measurement companies propose appropriate solutions based on on-site conditions, coupled with appropriate control systems, to achieve the purpose of stable material discharging. This is What the business needs most. In addition, the measurement accuracy of measuring equipment is getting higher and higher, and companies should actively adopt new technologies and new equipment to promote the progress of the cement production industry.