Judging from the energy consumption indicators of the masking and retreating process in the annealing operation area, the natural gas consumption of the masking and retreating process in March decreased by 2.02 yuan/ton of steel year-on-year, and the consumption of nitrogen and hydrogen decreased by 0.56 yuan/ton of steel and 0.34 yuan/ton of steel respectively. On March 29, the head of the annealing operation area said at the production scheduling meeting of the Hegang Hegang Plate Industry Division.
Since the first quarter of 2022, focusing on cost reduction work, by benchmarking advanced enterprises in the industry, we will further optimize the consumption of environmentally friendly energy media, and create favorable conditions for cost reduction in the cover retreat process. The research team has repeatedly explored key indicators such as heating and heating time, natural gas consumption, nitrogen purging and hydrogen flow of BA material process products.
The team collected data based on the heating curve and found that in the heating section of individual furnaces, under normal circumstances, it takes 6 hours to heat to reach 450 degrees Celsius, but individual furnaces need to be heated for 8 hours to reach 450 degrees Celsius, and there will be a heating delay. At this time, the hydrogen is still added at the normal flow rate, thus causing waste. After continuous research and practice, the team maintained and upgraded the natural gas filtration device and the control valve with inflexible rotation. At the same time, the process variables in the PLC program were optimized and dynamically compensated. After a period of operation, the problem was completely solved. The problem of over-temperature delay and waste of energy and medium.
On the premise of ensuring safety, the team also shortened the secondary nitrogen purge time, from the original 20 minutes to 15 minutes of purging; under the condition of ensuring product quality, the hydrogen flow was changed from 10 cubic meters / The hour is reduced to 9 cubic meters per hour, further reducing the consumption of energy media.
In addition, the department has carried out technological upgrading and transformation of production equipment, the manufacturing cost has dropped by about 25 yuan/ton steel year-on-year, and the environmental protection benefits have been improved.
