Let’s talk about fire management!

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What is “fire fall”? “Fire fall” is a phenomenon that occurs objectively during the coking production process; it is a sign that the coke cake has reached basic maturity. ““The fire drop time” can quantitatively express the maturity of the coke cake. “\"Fire fall management\" is a thermological management process that focuses directly on product quality. What is the \"fire drop time\"? By taking advantage of certain inherent characteristics of the coal during the carbonization process in the carbonization chamber, it is possible to determine the moment when the fire drop phenomenon occurs; this moment is called the \"fire drop moment\". The time that passes from the moment coal is loaded until the fire drop moment is known as the \"fire drop time\". Several time concepts and characteristics of flame drop: (1) The temperature at various points on the cake is relatively uniform, all reaching around 900–950°C ； ⑵ The color of waste gas changes from yellow to blue-white ； ⑶ The flame after the combustion of waste gas is a transparent rice-yellow color ； ⑷ In the composition of waste gas, CH4 decreases sharply while H2 increases rapidly ； ⑸ The calorific value of waste coal gas is significantly reduced ； ⑹ The generation of waste gas has decreased significantly ； ⑺ The temperature of the waste gas rises significantly at a certain time before the flame goes out, and then drops sharply. Method for determining fire fall: Fire fall can be determined by using any one of the seven characteristics of this phenomenon. Currently, the features that are more convenient and mature to use include the 2nd (color of raw coal gas), 3rd (flame of raw coal gas), 6th (generation amount of raw coal gas), 7th (temperature of raw coal gas), etc. Methods for manually determining the time of fire drop: Determining the time of fire drop based on the amount of raw gas produced; determining it based on the temperature of the raw gas. Factors affecting the time of fire drop: During the carbonization process, the time of fire drop is a variable. The main factors affecting the cooling time are: the temperature of the furnace ； Furnace temperature distribution ； Properties of the coal charged to the furnace (moisture, bulk density, volatile matter) ； The thermal conductivity of the furnace wall, as well as the width of the carbonization chamber, and so on. The importance of combustion management: The quality of coke oven combustion management has a direct impact on the yield and quality of coke ； Heat consumption for coking ； Furnace life ； Properties and yield of by-products ； Environment, etc. The goal of combustion management is to adjust all burners to achieve the most optimal temperature distribution and combustion conditions, and to maintain this optimal state on a long-term, continuous, and stable basis ； When the furnace conditions may or have already changed, it is possible to promptly identify the factors causing these changes, and to make rapid and appropriate adjustments and actions. Applications of fire drop management ⑴ The \"fire drop time\" can be used as the main control parameter for coke oven heating ； ⑵ It facilitates the automation of coke oven heating control ； ⑶ It can reduce the quality differences among the coke in each furnace ； ⑷ It prevents the emergence of defective products (coke). Comparison with traditional thermal management models 1. Management of retorting conditions (process) versus management of retorting results (products) ； 2. Progress through \"remaining unchanged\" in the face of constant change and \"adapting through change\". 3. Production efficiency has been improved.