Control system for full-automatic operation of coal blending process of metallurgical enterprise

Abstract

The invention relates to a control system for full-automatic operation of a coal blending process of a metallurgical enterprise. The control system comprises an automatic heat value adjusting module,an automatic flow adjusting module and a pressure and fan load control module. The heat value automatic adjustment module is responsible for determining a target heat value and calculating the high coking coal ratio; the flow automatic adjustment module determines the opening degree of the coking coal adjustment valve on the basis of user gas consumption fluctuation and the operation state of thepressurization station, and the defects that a calorific value instrument is poor in accuracy, large in calorific value indication fluctuation and high in failure rate in the calorific value control process can be overcome; and the defects of more manual operations, poor adjustment precision and lagging adjustment action caused by no control parameters in the flow, pressure and load adjustment process are avoided. According to the scheme, under the condition that the gas supply requirement is met, heat value, flow, pressure and unit load control data are accurate and stable.

Description

technical field [0001] The invention relates to a control system, in particular to a control system for fully automatic operation of a coal mixing process in a metallurgical enterprise, belonging to the fields of energy environmental protection and industrial automation control. Background technique [0002] Blast furnace gas and coke oven gas are by-products of metallurgical enterprises in the process of blast furnace smelting and coke oven smelting respectively. Among them, coke oven gas has a higher calorific value, while high coal has a lower calorific value. In order to fully utilize the gas, it is necessary to combine the two The gas is mixed in a certain proportion. The two kinds of gas enter the blast furnace gas main pipe and the coke oven gas main pipe respectively, and then pass through the processing conversion unit to form high-coke mixed gas, which is transported to users as fuel for heating various furnaces and kilns. The processing conversion process is divi...

AI Technical Summary

Problems solved by technology

[0012] In the above process control process, there are the following problems: 1. The flow rate of coke oven gas needs to be manually adjusted. According to the fluctuation of gas consumption by users, the on-site worker on duty manually adjusts the coking coal regulating valve to increase or decrease the coking coal flow rate. The control accuracy is extremely low, and there are large The hysteresis of coke oven gas and the waste of high calorific value coke oven gas, especially in the current situation that the country strictly restricts the coke oven production capacity of metallurgical enterprises and the serious shortage of coke oven gas, the full and reasonable use of coke oven gas is particularly important for the normal production of metallurgical enterprises Important; 2. The requirements for the manufacture and maintenance of the calorific value instrument are relatively high. In the actual operation of metallurgical enterprises, the online calorific value instrument has not been able to meet the required accuracy requirements, and even some enterprises have not installed it at all. As a result, there has been a lack of calorific value data in the on-site operating parameters, the quality of the gas supply cannot meet the needs of users, and the control reliability is poor. There are often phenomena that the calorific value is too high to cause waste and the calorific value is too low to prolong the heating time of the user; 3. Due to the fluctuation of flow pressure caused by the control accuracy of the mixing station in front of the pressurizer at the press station, the stability of the load fluctuation of the pressurizer cannot be guaranteed, which affects the life of the pressurizer; 4. The control logic between the regulating valves of the mixing station and the pressurization station Chaos, arbitrariness in the process of manual adjustment

In summary, under the mode of "mixing first and pressurizing later", there has been a lack of a control scheme to realize fully automatic operation; therefore, a new solution is urgently needed to solve this technical problem

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