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May 14, 2020

Working Principle of Slipp Activated Carbon Production furnace 2 (one of the activated carbon production equipment)

Working principle of activated carbon produced by Snape Activation Furnace 2 (one of Activated Carbon Production Equipment)
The main principles of the oven drying of Activated Carbon Equipment are as follows:
(1) manhole shall be opened on both sides of the fire passage, and a pair of furnaces shall be simply stacked with refractory bricks to burn block raw coal. The hot flue gas generated by combustion is pumped into the furnace due to the negative pressure inside the furnace body, and the furnace body is heated to 50-100 ℃ by heat exchange. The main purpose of this step is to remove the moisture in the refractory brick wall as much as possible by heating.
(2) fill the activation furnace with material and start to heat up formally. The theoretical ignition point of coke in blast furnace is 450-600 ℃. According to the actual observation, the carbonized material can be ignited at 400-550 ℃, but it can not be stably burned until 600-650 ℃. Obvious flame can be seen in the combustion chamber at each point (2) the main cooling reaction can occur stably above 600 ℃, and the generated carbon monoxide can be burned in the combustion chamber.
Therefore, there are three main stages of heating up: ① the residual volatiles in the carbonized materials are heated to volatilize and burn at 200-300 ℃, and the coke particles are ignited by exothermic auxiliary ignition; ② at 400-550 ℃, the carbonized material itself is ignited, and the exothermic heat is further heated and heated; ③ when the inner wall temperature of the furnace body rises to above 600 ℃, the main cooling reaction begins; ② the carbon monoxide generated is ignited in the combustion chamber at each point Burning, so that the temperature can be raised rapidly.
Once the third stage is reached, the intensity of combustion can be adjusted by adjusting the air to control the temperature. At this stage, all combustion has met the requirements of chain operation. If the operation is improper, the combustion is easy to get out of control, resulting in severe temperature rise or even rapid reaching above 1000 ℃, eventually leading to danger.
If the temperature begins to rise sharply, measures should be taken in advance before reaching 900 ℃, such as: 1) steam is introduced into the combustion chamber at the corresponding point to absorb heat through water gas reaction, so as to control the temperature (high temperature will increase the conversion rate of the reaction, produce more water gas, and contact with air will make the combustion more intense, which will lead to more uncontrollable temperature); ② hopper steam seal, The main source of combustion supporting oxygen is the air pressure pulling plate at the top of the hopper. When the cycle is opened, the air drawn through the negative pressure of the furnace body is pumped through the hopper, so that the air can not enter the furnace body from the hopper, so as to achieve the function of flame retardant and cooling (generally, this method is only effective for the two-layer combustion chamber at the lower part of the furnace body, and the furnace body is heated during the heating process When the air gate is closed, the negative pressure inside the furnace body will decrease rapidly, and the air pumping force will be reduced, so that the flame retardant and cooling can be achieved (when only one half of the furnace air gate is closed, the negative pressure of the other end of the furnace body will still conduct the negative pressure through the fire channel, so that the side half furnace can still draw air from the outside Burning. Moreover, once the gate is closed, the temperature on the upper part of the furnace will drop rapidly and the drying time will be prolonged).
The best way is to use three kinds of emergency operation reasonably to deal with the situation of temperature rising out of control. The most correct operation mode is to adjust the negative pressure to make the furnace body temperature rise steadily, and to inject steam in advance to prevent the occurrence of temperature out of control.
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