How to determine the time of fire fall
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Characteristics of fire drop: 1. The temperature at various points on the scorched cake is relatively uniform, all reaching around 900–950°C； 2. The color of raw coal gas changes from yellow to blue-white ； 3. The flame after the combustion of waste gas is a transparent rice-yellow color ； 4. In the composition of waste gas, CH4 decreases sharply while H2 increases rapidly ； 5. The calorific value of waste gas is significantly reduced ； 6. The generation of waste gas has decreased significantly ； 7. The temperature of the waste gas rises significantly at a certain time before the flame goes out, and then drops sharply. Method for determining when the flame goes out: It seems simple; it is possible to determine when the flame goes out by using any one of the seven characteristics associated with this phenomenon. The characteristics that are more convenient and well-developed for application include the color of raw coal gas, its flame, the amount generated, and its temperature. The question is: in practice, how do you determine it? Article 1: Measure the center temperature of the coke cake once per furnace? Article 2: The color of waste gas changes from yellow to blue-white; where should it be observed? Open the riser cover? Fire fall observation hole? Article 3: The flame after the combustion of waste gas is a transparent rice-yellow color; from where should one observe the burning gas? When should I watch it? Article 4: How is it determined that CH4 decreases sharply while H2 increases rapidly in the components of waste coal gas? Test one batch and then another? When should samples be taken for testing? Article 5: The calorific value of waste coal gas is significantly reduced; should the calorific value be tested once per furnace batch? It’s difficult for humans on-site to judge, right? Article 6: How do on-site operators determine that the generation of waste gas has significantly decreased? Article 7: The temperature of the waste gas rises significantly at a certain time before the flame goes out, followed by a sharp drop; a thermocouple can be installed to monitor this continuously. What is the typical maximum temperature of waste gas?
Determining the onset of fire requires operators with professional knowledge and practical experience. Regarding the questions you raised, here are the relevant answers: 1. Measuring the temperature at the center of the cake usually requires specialized equipment; it is not measured for each batch, but rather checked on a regular basis. 2. The color of raw coal gas is usually observed through an observation window or hole on the equipment, without the need to open the cover of the rising tube. 3. The color of the flame is usually observed through an observation window or hole on the device, during the burning process. 4. Changes in the composition of waste gas need to be determined using laboratory gas analysis equipment; sampling for testing is not done for every batch, but usually on a regular basis or as required by the operating conditions. 5. The determination of the reduced calorific value of gas is also carried out through laboratory equipment, rather than being decided by on-site operators. 6. The reduction in the amount of waste gas generated is usually monitored by observing the instrument readings on the equipment, or it can also be determined by comparing the operating conditions of the equipment before and now. 7. Changes in the temperature of the waste gas are monitored in real time using temperature sensors installed on the equipment. As for the maximum temperature, it depends on the specific type of coke oven and the mode of operation; generally, it can reach 900°C to 950°C. The above answers are based on general circumstances; adjustments can be made according to the actual equipment and operating conditions. .
I believe that to determine the moment of flameout at present, it is sufficient to install temperature measurement devices at the base of the rising pipe; by observing the temperature variation curve throughout the coking process, it is possible to identify the time of flameout. The combustion end time is related to the entire heating regime, pressure regime, and the characteristics of the coal fed into the furnace; it is not necessarily fixed.