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Gas hot blast stove uses gas fuel as its name implies. The equipment is relatively simple and easy to operate. With the increasing efforts to strictly check environmental protection, many manufacturers will change coal-fired hot stoves to gas-fired hot stoves. In this way, not only energy saving and emission reduction, but also environmental protection is reliable. Do you know how to calculate the gas consumption of gas-fired hot stoves in use? What can be done to reduce the gas consumption of natural gas hot stoves and thereby reduce costs? 耗氣量計算︰1、確定容量2、確定受熱面熱阻3、根據上述兩個條件確定熱損失。4、確定熱損失之後即得到熱效率5、得到熱效率之後，根據總容量乘設計參數得出總熱焓6、然後用燃氣總熱焓乘鍋爐熱效率，得到數值再除介質的總熱焓。即得到燃氣的總量。 天然氣的熱值按照8500大卡計算，的熱效率按照90％計算。出力為1噸的燃氣在滿負荷的狀態下連續工作1小時，大約需要消耗天然氣75立方米左右。
Calculating the gas consumption of natural gas hot blast stove: 1. Determining the capacity of hot blast stove 2. Determining the heat resistance of heating surface 3. Determining the heat loss according to the above two conditions. 4. After determining the heat loss, the thermal efficiency is 5. After obtaining the thermal efficiency, the total heat enthalpy is 6 according to the design parameters of the total capacity multiplied. Then the total heat enthalpy of the gas is multiplied by the thermal efficiency of the boiler, and the total heat enthalpy of the medium is removed. That is to say, the total amount of gas is obtained. Calorific value of natural gas is calculated according to 8500 calories, and thermal efficiency of hot blast stove is calculated according to 90%. The gas hot blast stove with output of 1 ton works continuously for 1 hour at full load, which consumes about 75 cubic meters of natural gas.
Reducing the gas consumption of natural gas hot blast stoves can be as follows:
1. Improving the condition of gas flow encounter: Improving the condition of gas flow and air flow in gas hot blast stove, its purpose is to increase their contact area. The larger the contact area is, the larger the reaction area is, and the combustion is intensified. Specifically, the gas and air can be divided into multiple streams, so that two streams of air have a certain speed and intersect; one stream of air (usually gas) passes through and submerges in another stream of air, and so on.
2. Strengthen mixing and disturbance: The combustion of gas fuel in gas hot-blast stove is a single-phase reaction. It is easier to ignite and burn than solid fuel, but its combustion speed and combustion perfection are closely related to the mixing of gas and air. The better the mixture, the faster and more complete the combustion and the shorter the flame. Therefore, as long as the stability of the flame is not destroyed, the air velocity in the air outlet or combustion chamber should be increased as far as possible, and barriers with large resistance such as baffles should be set up at the entrance, so that they can press and blast the flame and increase the disturbance of the air flow to enhance mixing.
3. Preheating gas and air: Increasing the temperature of gas and air can enhance combustion reaction. Therefore, the waste heat of exhaust gas should be used to preheat the gas and air temperature, so as to improve the combustion temperature and flame propagation speed, so that the combustion process can be strengthened.
4. Rotating and circulating airflow: Promoting airflow rotation can enhance disturbance and mixing. At the same time, a reflux zone will be formed in the center of the rotating air flow to guide a large number of flue gas reflux and circulation, which not only strengthens the mixing, but also prolongs the flue gas flow route and stay time in the gas hot blast stove and reduces the incomplete combustion loss.
5. Flue gas recirculation: In order to increase the temperature of combustion reaction zone of gas hot blast stove, a part of high-temperature flue gas can be directed to combustion data to mix with end-burning or burning combustible mixture to improve combustion intensity. However, it should be noted that the amount of recycled flue gas should not be too large, otherwise the combustible mixing hook will be diluted due to excessive inert materials, which will slow down the combustion rate, even hypoxic pyrolysis, resulting in incomplete combustion loss of gas hot stove.
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