Hydrogen-rich gas fuel self-preheating injection blast furnace

Abstract

The utility model discloses a hydrogen-rich gas fuel self-preheating injection blast furnace. The system at least comprises a blast furnace; a blowing pipe is arranged on the blast furnace; a heat exchange cooling wall is arranged on the inner side of the blast furnace above the injection pipe; a cooling water pipe is arranged on the side, close to the blast furnace shell, of the heat exchange cooling wall; a heat exchange coil pipe is arranged on the side, far away from the blast furnace shell, of the heat exchange cooling wall; the air inlet end of the heat exchange coil pipe is led out from the side wall of the blast furnace and is communicated with a hydrogen-rich gas fuel supply pipe; and the gas outlet end of the heat exchange coil pipe is led out from the side wall of the blast furnace and is communicated with a hydrogen-rich gas fuel gas inlet pipe of the injection pipe. The hydrogen-rich fuel gas firstly enters the blast furnace body, is preheated to a certain temperature by utilizing waste heat at the middle upper part of the blast furnace body, and then is uniformly injected into the blast furnace body from the injection pipe, so that the consumption of coke and pulverized coal per ton of iron of the blast furnace can be reduced. Meanwhile, the overall temperature of the cooling wall is reduced, and the service life of the heat exchange cooling wall is prolonged.

Description

Technical Field

[0001] The utility model relates to a self-preheating and blowing blast furnace of hydrogen-rich gas fuel in a blast furnace ironmaking workshop. Background Art

[0002] Blast furnace ironmaking is a major energy consumer in long-process steel enterprises. According to statistics, its process energy consumption index accounts for more than 70% of the total carbon emissions of the entire steel process, which is a low carbon content per ton of iron in blast furnaces. Injection of hydrogen-rich gas fuel is a very promising technical route. However, due to the low density and heat capacity of hydrogen, the reduction reaction after injection into the furnace requires heat absorption. Excessive injection will reduce the heat in the furnace, reduce the activity of the furnace, and affect the operation of the blast furnace. The currently feasible technical route is to increase the injection volume of the gas by increasing the preheating temperature of the hydrogen-rich fuel gas. Utility Model Content

[0003] In view of the defects and shortcomings of the prior art, the utility model provides a self-preheating and injection blast furnace with hydrogen-rich gas fuel, which preheats the hydrogen-rich fuel gas for injection by using the waste heat originally carried away by the cooling water of the cooling wall in the middle and upper part of the furnace body, and preheats the hydrogen-rich fuel gas to a certain temperature to increase the injection amount, thereby reducing the consumption of coke and pulverized coal per ton of iron in the blast furnace.

[0004] In order to achieve the above-mentioned object, the hydrogen-rich gas fuel self-preheating injection blast furnace of the utility model at least comprises:

[0005] A blast furnace; a blow pipe is arranged on the blast furnace; a heat exchange cooling wall is arranged on the inner side of the blast furnace above the blow pipe; a cooling water pipe is arranged on the heat exchange cooling wall near the blast furnace shell; a heat exchange coil is arranged on the heat exchange cooling wall far from the blast furnace shell; the heat exchange air inlet end of the heat exchange coil is led out from the blast furnace side wall and connected to the hydrogen-rich gas fuel supply pipe; the air outlet end of the heat exchange coil is led out from the blast furnace side wall and connected to the hydrogen-rich gas fuel inlet pipe of the blow pipe.

[0006] Furthermore, the heat exchange cooling wall comprises a wall body, a cooling water pipe is arranged on one side of the wall body; a groove is arranged on the other side of the wall body, and the heat exchange coil is arranged in the groove.

[0007] Furthermore, the hydrogen-rich gas fuel supply pipe outside the blast furnace includes an air intake main pipe and an air intake surrounding pipe arranged around the circumference of the blast furnace; the heat exchange coil is composed of a plurality of heat exchange branch coils in different phases connected in parallel, and the upper end of each heat exchange branch coil is led out from the side wall of the blast furnace and connected to the air intake surrounding pipe;

[0008] An exhaust pipe is arranged around the circumference of the blast furnace near the injection pipe outside the blast furnace; the lower end of each heat exchange branch coil is led out from the side wall of the blast furnace and connected to the exhaust pipe; the exhaust pipe is connected to the injection pipe.

[0009] Furthermore, it also includes:

[0010] Temperature sensor, used to monitor the outlet water temperature of the cooling water pipe in real time;

[0011] A controlled solenoid valve for controlling the flow of the cooling water pipe is arranged on the cooling water pipe;

[0012] The control device is used to output a control signal according to the temperature detected by the temperature sensor to control the water output of the cooling water pipe.

[0013] Furthermore, the heat exchange coil adopts a serpentine tube structure and is spirally placed in the cooling wall groove.

[0014] Furthermore, the heat exchange coil side of the cooling wall is cast with heat-conductive and wear-resistant castable material.

[0015] Furthermore, the heat exchange coil is flexibly fixed in the groove of the heat exchange cooling wall by means of buckles.

[0016] In order to achieve the above-mentioned object, the utility model provides a blast furnace hydrogen-rich gas fuel injection self-preheating method, wherein the method comprises:

[0017] A cooling water pipe is arranged on the side of the heat exchange cooling wall inside the blast furnace close to the inner wall of the blast furnace;

[0018] A heat exchange coil is arranged on the side of the heat exchange cooling wall far from the inner wall of the blast furnace;

[0019] A blowing pipe is provided on the blast furnace;

[0020] The hydrogen-rich gas fuel is preheated through the heat exchange coil and then output to the injection pipe.

[0021] Furthermore, the heat exchange cooling wall comprises a wall body, a cooling water pipe is arranged on one side of the wall body; a groove is arranged on the other side of the wall body, and the heat exchange coil is arranged in the groove.

[0022] Furthermore, the method further comprises the following steps:

[0023] Real-time monitoring of the outlet water temperature of the cooling water pipe;

[0024] When the outlet water temperature of the cooling water pipe is greater than the first predetermined temperature, the water outlet of the cooling water pipe is increased;

[0025] When the outlet water temperature of the cooling water pipe is lower than the second predetermined temperature, the outlet water volume of the cooling water pipe is reduced.

[0026] The hydrogen-rich fuel gas of the utility model first enters the interior of the blast furnace body, and is preheated to a certain temperature by utilizing the waste heat in the middle and upper part of the blast furnace body, and then is evenly sprayed into the blast furnace body from the injection pipe, thereby reducing the consumption of coke and pulverized coal per ton of iron in the blast furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the hydrogen-rich gas fuel self-preheating injection blast furnace of the utility model.

[0028] Figure 2 for Figure 1 Schematic diagram of the plane expansion.

[0029] Figure 3 for Figure 1 Partial schematic diagram of the heat exchange cooling wall.

[0030] In the figure: 1. Blast furnace body; 2. Air intake main pipe; 3. Air intake surrounding pipe; 4. Air intake branch pipe; 5. Heat exchange cooling wall;

[0031] 6. Inter-wall connecting pipe; 7. Air outlet branch pipe; 8. Air outlet surrounding pipe; 9. Injection branch pipe;

[0032] 501, heat exchange coil; 502, cooling water pipe; 503, wall; 504, cooling wall groove; DETAILED DESCRIPTION

[0033] The embodiments of the utility model are described in detail below with reference to the accompanying drawings.

[0034] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0035] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "plurality" means two or more.

[0036] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] Example

[0038] like Figure 1 , Figure 2 , Figure 3 As shown, a hydrogen-rich gas-fired self-preheating material injection blast furnace of this embodiment comprises a blast furnace body (1), an air intake main pipe (2), an air intake surrounding pipe (3), an air intake branch pipe (4), a heat exchange cooling wall (5), an inter-wall connecting pipe (6), an air outlet branch pipe (7), an air outlet surrounding pipe (8), and an injection branch pipe (9).

[0039] The blast furnace body (1) is the service object of the utility model and has universality and generality.

[0040] The heat exchange cooling wall (5) comprises a heat exchange coil (501), a cooling water pipe (502), a wall body (503), and a cooling wall groove (504).

[0041] The working principle of this embodiment is as follows: the hydrogen-rich gas fuel for blast furnace injection enters the air intake pipe (3) through the air intake main pipe (2); the air intake pipe (3) is arranged along the circumference of the blast furnace and has a plurality of air intake branch pipes (4) evenly distributed thereon; the hydrogen-rich gas fuel enters the heat exchange cooling wall (5) inside the blast furnace body (1) evenly through the air intake branch pipes (4) in the air intake pipe (3); the heat exchange cooling wall (5) is provided with a heat exchange coil (501); the hydrogen-rich gas fuel is preheated to a set temperature through the series connection of the plurality of heat exchange coils (501); the hydrogen-rich gas fuel preheated to a specific temperature is enriched in the air outlet pipe (8) through the air outlet branch pipe (7); and the high-temperature hydrogen-rich gas fuel is sprayed into the furnace through the injection branch pipes (9) evenly distributed on the air outlet pipe (8).

[0042] As an improvement of the above embodiment, a temperature sensor is used to monitor the outlet water temperature of the cooling water pipe in real time, and the temperature of the wall (503) can be adjusted by adjusting the water volume in the cooling water pipe (502) to reach the preheating temperature of the adjusted gas. That is, when the outlet water temperature of the cooling water pipe is greater than the first predetermined temperature, the outlet water volume of the cooling water pipe is increased; when the outlet water temperature of the cooling water pipe is less than the second predetermined temperature, the outlet water volume of the cooling water pipe is reduced.

[0043] As an improvement of the above embodiment, the heat exchange coil is located on the hot surface of the heat exchange cooling wall, adopts a serpentine tube structure, and is spirally placed inside the cooling wall groove. The hot surface is integrally cast with high thermal conductivity and wear-resistant castable.

[0044] As an improvement of the above embodiment, the cooling water pipe is provided with a bypass water pipe, which adjusts and balances the preheating temperature of the hydrogen-rich fuel gas and the temperature of the wall by adjusting the cooling water volume inside the cooling water pipe, thereby protecting the wall from damage while preheating the gas.

[0045] As an improvement of the above embodiment, the hydrogen-rich fuel gas can be sprayed into the blast furnace through the tuyere, or can be sprayed into the blast furnace through re-opening holes in the furnace belly or the furnace waist.

[0046] As an improvement of the above embodiment, the heat exchange coil adopts a thick-walled metal tube with high thermal conductivity, wear resistance and pressure resistance, and is flexibly fixed to the inside of the groove of the heat exchange cooling wall by means of a buckle.

[0047] The embedding depth of the heat exchange coil in the groove can be adjusted according to the design requirements. While preheating the hydrogen-rich fuel gas, the heat exchange coil also reduces the overall temperature of the cooling wall, provides certain protection for the cooling wall, and prolongs the service life of the heat exchange cooling wall. The self-preheating process of the hydrogen-rich gas fuel injection blast furnace body utilizes the harmful waste heat inside the blast furnace, which improves the utilization efficiency of the blast furnace waste heat.

[0048] In summary, the utility model reduces the carbon consumption of the blast furnace by increasing the temperature of the hydrogen-rich gas fuel injected into the blast furnace and increasing the injection amount of the hydrogen-rich gas fuel. At the same time, the preheating heat comes from the waste heat of the blast furnace itself, which improves the waste heat utilization efficiency of the blast furnace and further reduces the carbon consumption of the blast furnace.

[0049] The utility model is described in detail above in conjunction with the accompanying drawings, but the utility model is not limited to the above embodiments, and various changes can be made within the knowledge of ordinary technicians in the field without departing from the purpose of the utility model. Many other changes and modifications that do not depart from the concept and scope of the utility model should be considered as the protection scope of the utility model.

[0050] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0051] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A hydrogen-rich gas fuel self-preheating injection blast furnace, characterized in that: At least: A blast furnace; a blow pipe is arranged on the blast furnace; a heat exchange cooling wall is arranged on the inner side of the blast furnace above the blow pipe; a cooling water pipe is arranged on the heat exchange cooling wall near the blast furnace shell; a heat exchange coil is arranged on the heat exchange cooling wall far from the blast furnace shell; the heat exchange air inlet end of the heat exchange coil is led out from the blast furnace side wall and connected to the hydrogen-rich gas fuel supply pipe; the air outlet end of the heat exchange coil is led out from the blast furnace side wall and connected to the hydrogen-rich gas fuel inlet pipe of the blow pipe.

2. The hydrogen-rich gas fuel self-preheating injection blast furnace according to claim 1, characterized in that: The heat exchange cooling wall comprises a wall body, a cooling water pipe is arranged on one side of the wall body; a groove is arranged on the other side of the wall body, and the heat exchange coil is arranged in the groove.

3. The hydrogen-rich gas fuel self-preheating injection blast furnace according to claim 1, characterized in that: The hydrogen-rich gas fuel supply pipe outside the blast furnace includes an air intake main pipe and an air intake surrounding pipe arranged around the circumference of the blast furnace; the heat exchange coil is composed of a plurality of heat exchange branch coils in different phases connected in parallel, and the upper end of each heat exchange branch coil is led out from the side wall of the blast furnace and connected to the air intake surrounding pipe; An exhaust pipe is arranged around the circumference of the blast furnace near the injection pipe outside the blast furnace; the lower end of each heat exchange branch coil is led out from the side wall of the blast furnace and connected to the exhaust pipe; the exhaust pipe is connected to the injection pipe.

4. The hydrogen-rich gas fuel self-preheating injection blast furnace according to claim 1, characterized in that: Also includes: Temperature sensor, used to monitor the outlet water temperature of the cooling water pipe in real time; A controlled solenoid valve for controlling the flow of the cooling water pipe is arranged on the cooling water pipe; The control device is used to output a control signal according to the temperature detected by the temperature sensor to control the water output of the cooling water pipe.

5. The hydrogen-rich gas fuel self-preheating injection blast furnace according to claim 1, characterized in that: The heat exchange coil adopts a serpentine tube structure and is spirally placed in the cooling wall groove.

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