CN212375300U

CN212375300U - Double-furnace type fine ore flying melting reduction steelmaking kiln

Info

Publication number: CN212375300U
Application number: CN202021946687.5U
Authority: CN
Inventors: 陈志伟
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-09-04
Filing date: 2020-09-04
Publication date: 2021-01-19
Anticipated expiration: 2030-09-04

Abstract

The utility model discloses a double-furnace type fine ore flying melting reduction steelmaking kiln, which belongs to the technical field of steelmaking. At present, steelmaking production mainly has converter method and electric furnace method two kinds, two kinds of methods can not directly use the iron ore steelmaking, the utility model discloses a two regenerator are used for preheating oxygen-containing gas and cold exact high temperature waste gas in turn, by two reacting furnace feeding in turn, the fuel dispersion can burn rapidly in the oxygen-containing gas of preheating and produce the high temperature reducing gas more than 1550 ℃, likepowder iron ore raw materials dispersion is in high temperature reducing gas, be in flight state, heat and mass transfer efficiency is very high, can control suitable fuel and oxygen-containing gas proportion through oxygen-containing gas input device or fuel flow regulation controlgear, can make the carbon content in the liquid molten iron that likepowder iron ore raw materials high temperature reduction produced reach the requirement of steelmaking.

Description

Double-furnace type fine ore flying melting reduction steelmaking kiln

Technical Field

The utility model belongs to the technical field of the steelmaking, specifically be a two stove type steelmaking kilns that carry out high temperature melting reduction steelmaking with likepowder steelmaking raw materials under flight state are related to.

Background

At present, steel-making production mainly comprises a converter method and an electric furnace method, wherein raw materials used in the converter method and the electric furnace method are pig iron, molten iron, scrap steel, direct reduced iron and the like, and iron ore can not be directly used for steel making.

SUMMERY OF THE UTILITY MODEL

In order to solve the above problem, the utility model provides a new technical scheme:

a double-furnace type fine ore flying melting reduction steelmaking kiln comprises two reaction furnaces, two regenerative chambers, two gas reversing flashboards, two flue gas reversing flashboards, oxygen-containing gas input equipment and flue gas discharge equipment; when one of the two regenerators is used for preheating the oxygen-containing gas, the other regenerator is used for cold determination of high-temperature exhaust gas, the regenerator used for preheating the oxygen-containing gas is provided with an oxygen-containing gas inlet and a preheated gas outlet, and the regenerator used for cold determination of the high-temperature exhaust gas is provided with a high-temperature exhaust gas inlet and a cold determination exhaust gas outlet; the oxygen-containing gas input device is communicated with the oxygen-containing gas inlet through one gas reversing flashboard in an open state and is connected with the cold waste gas outlet through the other gas reversing flashboard in a closed state; the flue gas discharge equipment is communicated with the cold waste gas outlet through one flue gas reversing gate plate in an open state and is connected with the oxygen-containing gas inlet through the other flue gas reversing gate plate in a closed state; the reaction furnace comprises raw material feeding equipment, a raw material feeding pipeline, a furnace wall, a feeding hole, an air inlet, a hearth and an air outlet; the raw material feeding pipeline of the reaction furnace comprises an outlet end and an inlet end, wherein the outlet end of the raw material feeding pipeline is communicated with the feeding hole of the reaction furnace, and the inlet end of the raw material feeding pipeline is communicated with raw material feeding equipment of the reaction furnace; the preheating gas outlet is communicated with the gas inlet of one reaction furnace through a preheating gas channel, the raw material feeding equipment of the reaction furnace is in a starting feeding state, the gas outlet of the reaction furnace is communicated with the gas inlet of the other reaction furnace, the raw material feeding equipment of the other reaction furnace is in a stopping feeding state, and the gas outlet of the other reaction furnace is communicated with the high-temperature waste gas inlet through a waste gas channel; a fuel inlet is arranged on the raw material feeding pipeline or near the feed inlet; the fuel input port is connected with a fuel flow regulation control device.

The raw material feeding equipment is used for inputting the powdery steelmaking raw material into the feeding hole through a raw material feeding pipeline; the powdered steelmaking raw material comprises a powdered iron ore raw material.

The hearth is basically cylindrical, and the air inlet and the air outlet are respectively positioned near two ends of the cylindrical hearth and are in tangential connection with the cylindrical hearth; the feed inlet is located substantially in the center of the top of the cylindrical furnace.

The double-furnace type fine ore flying melting reduction steelmaking kiln further comprises a liquid discharge port, and the liquid discharge port is located at the bottom of the hearth or near the bottom of the hearth.

As an improvement of the double-furnace type powder ore flying, melting and reducing steelmaking kiln of the utility model, the preheating gas channel and the waste gas channel are both provided with vent holes, and the vent holes arranged on the preheating gas channel and the vent holes arranged on the waste gas channel are connected by vent pipes; and the air pipe is provided with a gas flow regulating valve.

Drawings

The following describes the dual-furnace type fine ore flying smelting reduction steelmaking furnace and its advantageous technical effects in detail with reference to the accompanying drawings and the specific embodiments.

Fig. 1 is a schematic structural diagram of a first embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a second embodiment of the present invention.

Fig. 3 is a schematic structural diagram of a third embodiment of the present invention.

Detailed Description

Example 1

Referring to fig. 1, fig. 1 shows a double-furnace type fine ore flying melting reduction steelmaking kiln, which comprises two reaction furnaces, two regenerators 3, two gas reversing gates 4, two flue gas reversing gates 5, an oxygen-containing gas input device 6 and a flue gas exhaust device 7; when one of the two regenerators 3 is used for preheating the oxygen-containing gas and the other is used for cold-confirmation of high-temperature exhaust gas, the regenerator 3 for preheating the oxygen-containing gas has an oxygen-containing gas inlet 18 and a preheated gas outlet 19, and the regenerator 3 for cold-confirmation of high-temperature exhaust gas has a high-temperature exhaust gas inlet 20 and a cold-confirmation exhaust gas outlet 21; the oxygen-containing gas input device 6 is communicated with the oxygen-containing gas inlet 18 through one gas reversing shutter 4 in an open state (the gas reversing shutter 4 on the right side in fig. 1) and is connected with the cold waste gas outlet 21 through the other gas reversing shutter 4 in a closed state (the gas reversing shutter 4 on the left side in fig. 1); the flue gas discharge device 7 is connected to the cold flue gas outlet 21 via one flue gas reversing damper 5 in the open state (the flue gas reversing damper 5 on the left side of fig. 1) and to the oxygen-containing gas inlet 18 via another flue gas reversing damper 5 in the closed state (the flue gas reversing damper 5 on the right side of fig. 1); the reaction furnace comprises raw material feeding equipment 1, a raw material feeding pipeline 9, an air inlet 10, a hearth 11, an air outlet 12, a feeding hole 13 and a furnace wall 14; the raw material feeding pipeline 9 of the reaction furnace comprises an outlet end 15 and an inlet end 16, wherein the outlet end 15 is communicated with the feeding hole 13 of the reaction furnace, and the inlet end 16 is communicated with the raw material feeding equipment 1 of the reaction furnace; the preheating gas outlet 19 is communicated with the gas inlet 10 of one reaction furnace through a preheating gas channel 24, the raw material feeding equipment 1 of the reaction furnace is in a starting feeding state, the gas outlet 12 of the reaction furnace is communicated with the gas inlet 10 of the other reaction furnace, the raw material feeding equipment 1 of the other reaction furnace is in a stopping feeding state, and the gas outlet 12 of the other reaction furnace is communicated with the high-temperature waste gas inlet 20 through a waste gas channel 25; the raw material feeding pipeline 9 is provided with a fuel inlet 23; the fuel inlet 23 is connected to the fuel flow rate regulation control device 8.

The double-furnace type fine ore flying melting reduction steelmaking kiln further comprises a liquid discharge port 2, and the liquid discharge port 2 is positioned at or near the bottom of the hearth 11.

The gas reversing flashboards 4 and the flue gas reversing flashboards 5 are used for reversing operation, when one of the gas reversing flashboards 4 and one of the flue gas reversing flashboards 5 are in an opening state, the other gas reversing flashboard 4 and the other flue gas reversing flashboard 5 are in a closing state. And the gas reversing gate plate 4 and the smoke reversing gate plate 5 are reversed once every a period of time, the gas reversing gate plate 4 and the smoke reversing gate plate 5 which are in an open state before reversing are in a closed state after reversing, and the gas reversing gate plate 4 and the smoke reversing gate plate 5 which are in a closed state before reversing are in an open state after reversing.

The reversing operation is generally performed once every 10 to 60 minutes.

Example 1 two reactors are used to feed alternately, the reactor connected to a regenerator for preheating oxygen-containing gas is in a feed state, and in the hearth of the reactor, fuel is dispersed in the preheated oxygen-containing gas to burn rapidly, and can reach more than 1550 ℃ to produce a gas containing CO and H₂A powdery iron ore raw material is supplied from a raw material supply means 1 connected to the reaction furnace, and the powdery iron ore raw material is dispersedIn high-temperature reducing gas, the slag is in a flying state, has very high heat and mass transfer efficiency, is rapidly melted into a liquid state, and is reduced to separate out liquid iron and molten slag; molten dust such as iron ore raw material in a molten state, liquid iron and slag in a molten state is flushed through a furnace wall 14 in a hearth along with the flow of high-temperature reducing gas, most of the molten dust adheres to the furnace wall 14, the liquid iron and the slag in the molten state flow downwards to a liquid outlet 2 near the bottom of the hearth 11 under the action of gravity and are output, a small part of the molten dust is carried in high-temperature reducing gas output from an exhaust port of the reactor, but the high-temperature reducing gas still carries a small part of the molten dust, the high-temperature reducing gas enters a second reactor, the second reactor is in a feeding stop state, the small part of the molten dust carried by the high-temperature reducing gas adheres to the furnace wall of the second reactor and is purified and separated, and the purified high-temperature reducing gas is input into a heat storage. Since both the raw material and the fuel of the powdery iron ore are in flight, the fuel is substantially gasified into a gas containing CO and H in the furnace by the oxygen-containing gas as long as the appropriate ratio of the fuel and the oxygen-containing gas is controlled by the oxygen-containing gas feed means 6 or the fuel flow rate adjusting control means 8₂The high-temperature reducing gas does not cause excessive carbon to be mixed into the liquid molten iron, and the carbon content in the liquid molten iron produced by the high-temperature reduction of the powdery iron ore raw material can be controlled to meet the steel-making requirement.

Example 2

Referring to FIG. 2, FIG. 2 shows a twin-furnace type fine ore flying smelting reduction steelmaking furnace which is substantially the same in construction as in example 1 except that a fuel feed port 23 is not provided in the raw material feed pipe 9 but is provided in the vicinity of the feed port 13; the fuel inlet 23 opens in the furnace wall 14 near the inlet opening 13.

Example 3

Referring to fig. 3, fig. 3 shows a twin-furnace type fine ore flying, melting, reducing and steelmaking kiln, which has substantially the same structure as that of example 1 except that vent holes 22 are provided in both a preheating gas channel 24 and an exhaust gas channel 25, and the vent holes 22 provided in the preheating gas channel 24 and the vent holes 22 provided in the exhaust gas channel 25 are connected by a vent pipe 26; the vent pipe 26 is provided with a gas flow rate regulating valve 27.

The air duct 26 can mix and burn the preheated oxygen-containing gas and the high-temperature reducing exhaust gas, and then introduce the mixed gas into a regenerator for cooling and recovering heat from the high-temperature exhaust gas, and can control the flow rate of the introduced oxygen-containing gas by adjusting the gas flow rate adjusting valve 27, thereby sufficiently burning the high-temperature reducing exhaust gas.

In the above embodiment, the flue gas discharging device 7 may adopt an induced draft fan or a chimney, and the oxygen-containing gas input device 6 may adopt an air blower, and the difference between the suction force of the flue gas discharging device 7 and the pressure of the oxygen-containing gas input device 6 is adjusted, so that any value from negative pressure to positive pressure of the furnace pressure can be controlled; the feed inlet 13, the air inlet 10 and the air outlet 12 are respectively arranged on the furnace wall 14; the raw material feeding device 1 is used for inputting the powdery steelmaking raw material into a feeding hole 13 through a raw material feeding pipeline 9; the raw material feeding device 1 can adopt a device for feeding powdery materials, such as an impeller feeder, a screw feeder and the like, and can also adopt other conventional devices as long as the powdery steel-making materials can be fed into the inlet end 16 of the raw material feeding pipeline 9; the hearth 11 is basically cylindrical, and the air inlet 10 and the air outlet 12 are respectively positioned near two ends of the cylindrical hearth 11 and are connected with the two ends in a tangent mode; the feed opening 13 is located substantially in the center of the top of the cylindrical furnace 11.

In the above embodiments, the powdered steelmaking material generally includes iron ore fines, powdered flux minerals, alloying elements; the flux mineral is typically limestone. The oxygen-containing gas can be air or oxygen-enriched air; the fuel input port can input liquid fuel, gas fuel and powdery solid fuel, and the powdery solid fuel is usually pulverized coal.

The converter and the electric furnace steel making need to intensively stir molten iron and blow oxygen to uniformly decarbonize the molten iron and uniformly mix alloy elements with the molten iron, and the furnace body refractory material is very easy to damage. The utility model discloses need not stir and just can control the molten iron carbonaceous content and reach the carbonaceous content requirement of steelmaking, with the raw materials charge-in pipeline 9 input furnace 11 together of alloy element and iron ore powder, alloy element can mix in high temperature molten iron evenly in furnace 11, also need not stir molten iron, is difficult to harm the refractory material on the oven 14.

The present invention is not limited to the above-described specific embodiments. In light of the above teachings, those skilled in the art can make appropriate modifications to the above embodiments, and such modifications are intended to fall within the scope of the present invention. Certain terminology is used in the description for convenience only and is not limiting.

Claims

1. A kind of double-furnace type fine ore flies the melting and reduces the steel-making kiln, it includes two reaction furnaces, two heat storage chambers, two gas reversal flashboards, two flue gas reversal flashboards, oxygen-containing gas input device and flue gas discharge device, characterized by that, one of said two heat storage chambers is used for preheating the oxygen-containing gas, another is used for cold and confirming the high-temperature waste gas, the heat storage chamber used for preheating the oxygen-containing gas has oxygen-containing gas inlet and preheated gas outlet, the heat storage chamber used for cold and confirming the high-temperature waste gas has high-temperature waste gas inlet and cold and confirming the waste gas outlet; the oxygen-containing gas input device is communicated with the oxygen-containing gas inlet through one gas reversing flashboard in an open state and is connected with the cold waste gas outlet through the other gas reversing flashboard in a closed state; the flue gas discharge equipment is communicated with the cold waste gas outlet through one flue gas reversing gate plate in an open state and is connected with the oxygen-containing gas inlet through the other flue gas reversing gate plate in a closed state; the reaction furnace comprises raw material feeding equipment, a raw material feeding pipeline, an air inlet, a hearth, an air outlet, a feeding hole and a furnace wall; the raw material feeding pipeline of the reaction furnace comprises an outlet end and an inlet end, wherein the outlet end of the raw material feeding pipeline is communicated with the feeding hole of the reaction furnace, and the inlet end of the raw material feeding pipeline is communicated with raw material feeding equipment of the reaction furnace; the preheating gas outlet is communicated with the gas inlet of one reaction furnace through a preheating gas channel, the raw material feeding equipment of the reaction furnace is in a starting feeding state, the gas outlet of the reaction furnace is communicated with the gas inlet of the other reaction furnace, the raw material feeding equipment of the other reaction furnace is in a stopping feeding state, and the gas outlet of the other reaction furnace is communicated with the high-temperature waste gas inlet through a waste gas channel; and a fuel inlet is arranged on the raw material feeding pipeline or near the feed inlet.

2. The twin-furnace type fine ore flying smelting reduction steelmaking kiln as set forth in claim 1, wherein: the fuel input port is connected with a fuel flow regulation control device.

3. The twin-furnace type fine ore flying smelting reduction steelmaking kiln as set forth in claim 1, wherein: the preheating gas channel and the waste gas channel are both provided with vent holes, and the vent holes arranged on the preheating gas channel and the vent holes arranged on the waste gas channel are connected through vent pipelines.

4. The twin-furnace type fine ore flying smelting reduction steelmaking kiln as set forth in claim 3, wherein: and the air pipe is provided with a gas flow regulating valve.

5. The twin-furnace type fine ore flying smelting reduction steelmaking according to any one of claims 1 to 4, characterized in that: the hearth is basically cylindrical, and the air inlet and the air outlet are respectively positioned near two ends of the cylindrical hearth and are in tangential connection with the cylindrical hearth.

6. The twin-furnace type fine ore flying smelting reduction steelmaking kiln as set forth in claim 5, wherein: the feed inlet is located substantially in the center of the top of the cylindrical furnace.

7. The twin-furnace type fine ore flying smelting reduction steelmaking according to any one of claims 1 to 4, characterized in that: the double-furnace type fine ore flying melting reduction steelmaking kiln further comprises a liquid discharge port, and the liquid discharge port is located at the bottom of the hearth or near the bottom of the hearth.