Equipment and method for directly using coal gasification hot gas to produce direct reduced iron in a gas-based shaft furnace
A gas-based shaft furnace and hot gas technology, applied to shaft furnaces, furnaces, furnace types, etc., can solve the problems of low efficiency and high investment in the rotary kiln process, and achieve the effects of high efficiency, good economy, and small investment
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Embodiment 1
[0035] Such as figure 1 As shown, it includes a fluidized bed coal gasifier 1, in which pulverized coal is placed, and oxygen and water vapor are introduced into it. By adjusting the ratio of oxygen and water vapor, the H of the synthesized gas produced is 2 and CO molar ratio is 1.2-1.7. 8-12%wt, preferably 10%wt, of dolomite powder can be mixed into the coal powder to reduce the sulfur content in the synthesis gas. The operating pressure in the fluidized bed coal gasifier 1 is 0.3 MPa-0.6 MPa, the temperature of the generated syngas can reach as high as 980°C, and the generated slag can be used as raw material for cement plants.
[0036] The syngas is mixed with the shaft furnace top gas that has been heat-exchanged and dedusted, and the lower-temperature heat-exchanged and dedusted shaft furnace top gas quenches the syngas to 800°C-850°C, in fact, it can be no higher than 850°C. The mixed gas is called hot raw gas.
[0037] The hot crude gas is passed into the gravity du...
Embodiment 2
[0049] A kind of iron making method, uses pulverized coal, steam and oxygen to prepare syngas under 0.3MPa operation pressure, the H of syngas 2 / CO is 1.2. The shaft furnace top gas with heat exchange and dedusting at 50°C is fed into the synthesis gas, and the two are mixed to obtain hot crude gas at 850°C. Dedust the hot crude gas to obtain a dust content of 9g / m 3 Purified crude gas.
[0050] Pass the purified crude gas into the reforming workspace, the temperature of the workspace is 1200°C, and the workspace is provided with a reforming furnace charge with a particle size of 50mm, including 65%wt coke, 25%wt dolomite and 10%wt converter Steel slag. CO removal in reforming space 2 and H 2 After S, reformed gas is obtained, its temperature is 1100°C, H 2 / CO is 1.2.
[0051] Pass the heat-exchanged and dedusted shaft furnace top gas at 50°C into the reformed gas to obtain synthetic reformed gas. Centrifugal dedusting of synthetically upgraded coal gas. Purified sy...
Embodiment 3
[0053] A kind of ironmaking method, use steam, oxygen and pulverized coal containing 12%wt dolomite powder to prepare synthesis gas under 0.5MPa operating pressure, by adjusting the ratio of water vapor and oxygen, the H of synthesis gas 2 / CO is 1.7. The shaft furnace top gas with heat exchange and dedusting at 30°C is fed into the synthesis gas, and the two are mixed to obtain hot crude gas at 800°C. Gravity dedusting is carried out on the hot crude gas first, and the carryover obtained by gravity dedusting is added back to the pulverized coal; then cyclone dedusting is carried out, and the dust obtained by cyclone dedusting is used to recover waste heat. Get dust content 3g / m 3 Purified crude gas.
[0054] Pass the purified crude gas into the reforming workspace, the temperature of the workspace is 1100°C, and the workspace is provided with reforming furnace charge with a particle size of 100mm, including 85%wt coke, 10%wt dolomite and 5%wt converter Steel slag. CO remo...
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