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Process for producing sintered ore and sintering machine

A manufacturing method and technology for sintering ore, which are applied in the directions of liquid carbonaceous fuel, lighting and heating equipment, furnace types, etc., can solve the problems of increased exhaust SOx, difficulty in supplying combustible gas, and heat supply limit for sintering raw material layers, etc. Reduce the effect of backfire

Inactive Publication Date: 2011-01-26
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the spreading range of the heavy oil in this technology is limited to a limited high-temperature area immediately after the ignition furnace, so it is effective for improving the strength of the uppermost layer part, but it is difficult to freely control the sintering reaction of the middle layer and the lower layer
[0011] The second problem is the risk of disaster prevention and safety and health
[0014] The third problem is the increase of exhaust SOx
However, even with this safe supply method, in the sintering method of supplying combustible gas as an auxiliary fuel, it is difficult to supply combustible gas in an amount exceeding the lower explosive limit concentration, so there is a theoretical limit to the heat supply to the sintering raw material layer.
[0023] The second problem is the incompleteness of the airtight seal between the outer cover for flammable gas supply and the upper surface of the sintering pallet
Therefore, when the negative pressure of the suction blower is reduced, or the suction blower is stopped due to a sudden accident, it is impossible to prevent these toxic and flammable gases from passing through the gap between the outer cover and the surface of the sintering raw material layer, or Possibility of spraying to the surroundings from the gap between the housing and the sintering machine pallet
Usually, since the sintering machine is installed in the house, when these gases flow out, not only the safety of the workers is concerned, but also the danger of flammable gases staying in the safe house for disaster prevention is concerned.
[0025] The third problem is that in order to supply combustible gases to the sintering raw material layer, it is unavoidable to install a large-scale cover above the sintering raw material layer in the direction of the machine length of the sintering machine.
When installing a flammable gas supply cover or supply device above the sintering raw material layer in the longitudinal direction of the sintering machine, they will become an obstacle to the replacement of sintering pallets, causing disadvantages such as greatly extending the repair time

Method used

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  • Process for producing sintered ore and sintering machine
  • Process for producing sintered ore and sintering machine
  • Process for producing sintered ore and sintering machine

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment

[0134] Using a sintering test device with an inner diameter of 300 mmφ x a height of 600 mm, the blended raw materials shown in Table 1 were loaded, and a sintering test was performed. Within 5 minutes from 3 minutes to 8 minutes after the start of ignition on the surface of the sintered raw material layer, 7 kg of various liquid fuels shown in Table 3 were sprinkled per 1 ton of the blended raw material, and a sintering test was carried out to measure the productivity of the sintered ore, Changes in qualified rate, quality and exhaust oxygen concentration of finished products. A summary of the test results is shown in Table 4. In addition, regarding the heavy oil spreading test shown in Comparative Example 5, the heavy oil remained without burning under the test conditions in which the spreading started 3 minutes after ignition, so the test conditions were changed to 1.5 minutes to 3.0 minutes after ignition. Dispersion takes place within 1.5 minutes.

[0135]

[0136] ...

no. 2 Embodiment

[0143] For a sintering area of ​​600m 2 , a sintering machine with a trolley width of 5m and a machine length of 120m, set figure 2 With the liquid fuel spray nozzle shown, the liquid fuel spray amount and spray position were changed, and the operation test was carried out. Table 5 shows the composition of raw materials used in this test. In this test, the raw material mix was not changed, and the operation test was carried out under stable conditions in which the layer thickness of the sintering machine was set to 580 mm and the negative pressure was set to 1600 mmAq.

[0144] The test standards for liquid fuel dispersion are shown in Table 6. Using ethanol as the liquid fuel, spraying an amount corresponding to 3.5 kg or 7.0 kg per 1 ton of compounding raw materials was performed to perform a comparison test with an operation in which no liquid fuel was sprayed. The scattered positions are divided into 3 areas: Area A (range of 5-30% of the captain), area B (range of 30-...

no. 3 Embodiment

[0156] Under the same sintering machine, raw material mix, operating conditions, and liquid fuel spraying conditions as in Example 11 in Table 7, the test was performed by adjusting the spraying amount in the width direction of the liquid fuel spraying nozzle. In this test, 50% more liquid fuel was sprayed than the central part to the part in the range of 500 mm from the side walls on both sides of the sintering pallet. However, the total amount of sprayed liquid fuel is the same as in Examples, and corresponds to a total of 7.0 kg per 1 ton of compounded raw materials.

[0157] The survey results of the pass rate distribution of the sintered cake obtained in this test are as follows: Figure 7 shown. Conditions for spreading ethanol uniformly in the width direction ( Figure 7 Under (a)), it was found that the pass rate near the side wall decreased, and under the condition of increasing the amount of dispersion near the side wall ( Figure 7 (b)), a sintered cake having a ...

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Abstract

A process for producing a sintered ore with an auxiliary heat source is provided which improves the yield and strength of a sintered ore, attains a reduction in discharge gas amount itself, inhibits the generation of controlled substances for the atmospheric environment, e.g., NOx, and can avoid operational dangers. Also provided is a sintering machine. The process for sintered-ore production comprises: introducing a sintering feed material obtained by mixing iron ore, a minor raw material, a solid fuel, etc. into a Dwight-Lloyd sintering machine; igniting the solid fuel in a surface layer part with an ignition furnace; and sucking air from above to cause a sintering reaction to continuously proceed downward. In the process, a highly volatile liquid fuel is sprayed as an auxiliary heat source from above over the surface of the sintering feed layer in that given region of the sintering pallet which ranges from the ignition-furnace outlet side to the completion of sintering.

Description

technical field [0001] The present invention relates to a method and a sintering machine for producing sintered ore for blast furnace raw materials. Background technique [0002] use figure 1 Schematic steps of a conventional method for producing sintered ore will be described. [0003] First, iron ore as the main raw material containing iron, limestone as the auxiliary raw material, coke as the solid fuel, and returned ore (fine-grained sintered ore produced in the sintering process that is smaller than the specified particle size for the blast furnace) are each Raw materials are poured out of the specified amount from the raw material mixing hopper 1 composed of iron ore hopper, limestone hopper, coke hopper, ore returning hopper, etc. to form sintering raw material 3, which is loaded into one or more sintering machines configured in series. In the mixer 2, the humidity is adjusted to about 5.5% to 8.5% by adding water as necessary to perform granulation. [0004] Next,...

Claims

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Application Information

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IPC IPC(8): C22B1/20C10L1/02C10L1/04F27B21/08F27B21/14
CPCC22B1/205F27B21/06
Inventor 笠间俊次
Owner NIPPON STEEL CORP
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