Ore preheating device before smelting

Abstract

The utility model discloses an ore preheating device before smelting. The ore preheating device comprises a shell, a drying cylinder, a combustion chamber and a combustor, wherein the top of the shell is provided with an opening; a drying cylinder is fixedly arranged in the shell, a combustion chamber is fixedly arranged below the shell, a combustor is fixedly arranged on the combustion chamber, an air outlet of the combustion chamber is communicated with an air inlet of the drying cylinder, and a plurality of air outlet holes are formed in the drying cylinder. Compared with the prior art, the connecting structure has the advantages that the connecting structure is simple and easy to realize, the power consumption of the submerged arc furnace is reduced, the production cost is further reduced, meanwhile, moisture contained in the ore is dried, safety accidents caused by gasification of the moisture contained in the ore at high temperature in the submerged arc furnace are effectively avoided, and the production safety is improved; the resources of CO and H2 in the tail gas are fully utilized.

Description

Technical field:

[0001] The utility model relates to a preheating device, in particular to an ore preheating device before smelting. Background technology:

[0002] High carbon ferrochrome is the most important raw material for producing stainless steel, that is, it is used as a gold agent for steelmaking. Currently, the raw chromite is directly added to the submerged arc furnace for smelting. Since the ore contains moisture, it is very easy to cause the moisture to gasify at high temperature and cause safety accidents. At the same time, the low-temperature ore needs to be heated to a certain temperature in the submerged arc furnace before high-temperature smelting can be carried out, resulting in high power consumption for smelting in the submerged arc furnace. At the same time, about 20% of CO and about 5% of H2 in the exhaust gas discharged during the submerged arc furnace smelting process are directly sent to the subsequent exhaust gas treatment, resulting in a waste of resources. Utility model content:

[0003] The utility model aims to provide an ore preheating device before smelting which has a simple connection structure, reduces production costs and improves production safety.

[0004] The utility model is implemented by the following technical scheme: The purpose of this patent is to provide a device for preheating ore before smelting, which includes a shell with a top opening, a drying cylinder, a combustion chamber and a burner; the drying cylinder is fixedly arranged inside the shell, the combustion chamber is fixedly arranged below the shell, the burner is fixedly arranged on the combustion chamber, the air outlet of the combustion chamber is connected to the air inlet of the drying cylinder, and a plurality of air outlet holes are opened on the drying cylinder.

[0005] Furthermore, the center line of the shell and the center line of the drying cylinder are in a straight line; and a plurality of discharge ports are evenly arranged at the bottom of the shell around the drying cylinder.

[0006] Furthermore, the tail gas outlet of the submerged arc furnace is communicated with the fuel gas inlet of the burner.

[0007] Furthermore, the top opening of the shell is designed to be funnel-shaped.

[0008] Furthermore, it also includes a dust collector and an induced draft fan; the air outlet of the shell is connected to the air inlet of the dust collector, and the air outlet of the dust collector is connected to the air inlet of the induced draft fan.

[0009] Advantages of the utility model: 1. The connection structure of the utility model is simple and easy to implement. The ore is preheated by the preheating device of the utility model before entering the ore-heating furnace to increase the temperature of the ore. It can be directly smelted at high temperature in the ore-heating furnace, which reduces the power consumption of the ore-heating furnace and thus reduces the production cost. At the same time, the moisture contained in the ore is dried, which effectively avoids the safety accidents caused by the gasification of the moisture contained in the ore at the high temperature in the ore-heating furnace, thereby improving the safety of production; 2. The exhaust gas of the ore-heating furnace is used for combustion to generate hot air for preheating and drying the ore, thereby realizing the full utilization of CO and H2 resources in the exhaust gas. Description of the drawings:

[0010] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0011] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0012] Figure 2 for Figure 1 Schematic diagram of the cross section of the AA section.

[0013] Shell 1, discharge port 11, drying cylinder 2, air outlet 21, combustion chamber 3, burner 4, dust collector 5, induced draft fan 6, submerged arc furnace 7. Specific implementation method:

[0014] Example: Figure 1-2 As shown, a device for preheating ore before smelting comprises a shell 1 with an opening on the top, a drying cylinder 2, a combustion chamber 3, a burner 4, a dust collector 5 and an induced draft fan 6; the drying cylinder 2 is fixedly arranged inside the shell 1, the combustion chamber 3 is fixedly arranged below the shell 1, the burner 4 is fixedly arranged on the combustion chamber 3, the exhaust gas outlet of the ore-heating furnace 7 is connected with the fuel gas inlet of the burner 4, the exhaust gas of the ore-heating furnace 7 is used for combustion to generate hot air for preheating and drying the ore, thereby realizing full utilization of CO and H2 resources in the exhaust gas.

[0015] The air outlet of the combustion chamber 3 is connected with the air inlet of the drying cylinder 2, and a plurality of air outlet holes 21 are provided on the drying cylinder 2; the center line of the shell 1 is in a straight line with the center line of the drying cylinder 2; a plurality of discharge ports 11 are evenly provided at the bottom of the shell 1 around the drying cylinder 2, and the top opening of the shell 1 is designed to be funnel-shaped to ensure that the ore is added into the shell 1 while reducing the loss of heat in the shell 1; the air outlet of the shell 1 is connected with the air inlet of the dust collector 5, and the air outlet of the dust collector 5 is connected with the air inlet of the induced draft fan 6.

[0016] Working principle: Ore is fed into the shell 1 from the top, and the high-temperature gas generated by the combustion of the burner 4 enters the drying cylinder 2 and is discharged from the air outlet 21 on the drying cylinder 2 to preheat and dry the ore around it, and then is discharged from the discharge port 11 on the shell 1 to the submerged arc furnace 7 for smelting. The dried flue gas is sent to the dust collector 5 for dust removal through the induced draft fan 6 and then discharged to the outside.

[0017] The connection structure of the utility model is simple and easy to implement. The ore is preheated by the preheating device of the utility model before entering the ore-heating furnace 7 to increase the temperature of the ore. The ore can be directly smelted at high temperature in the ore-heating furnace 7, which reduces the power consumption of the ore-heating furnace 7 and thus reduces the production cost. At the same time, the moisture contained in the ore is dried, which effectively avoids the safety accidents caused by the gasification of the moisture contained in the ore at the high temperature in the ore-heating furnace 7, thereby improving the safety of production.

[0018] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for preheating ore before smelting, characterized in that: It includes a shell with a top opening, a drying cylinder, a combustion chamber and a burner; the drying cylinder is fixedly arranged inside the shell, the combustion chamber is fixedly arranged below the shell, the burner is fixedly arranged on the combustion chamber, the air outlet of the combustion chamber is connected to the air inlet of the drying cylinder, and a plurality of air outlet holes are opened on the drying cylinder.

2. The ore preheating device before smelting according to claim 1 is characterized in that: The center line of the shell and the center line of the drying cylinder are in a straight line; a plurality of discharge ports are evenly arranged at the bottom of the shell around the drying cylinder.

3. The ore preheating device before smelting according to claim 1 is characterized in that: The tail gas outlet of the submerged arc furnace is communicated with the fuel gas inlet of the burner.

4. The ore preheating device before smelting according to claim 1 is characterized in that: The top opening of the shell is designed to be funnel-shaped.

5. The ore preheating device before smelting according to any one of claims 1 to 4, characterized in that: It also includes a dust collector and an induced draft fan; the air outlet of the shell is connected to the air inlet of the dust collector, and the air outlet of the dust collector is connected to the air inlet of the induced draft fan.

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