Pulverized coal gas composite spray gun

Abstract

The utility model belongs to the field of pulverized coal and coal gas composite spray guns, and relates to a pulverized coal and coal gas composite spray gun, which comprises a pulverized coal channel, a coal gas channel, a gun body channel and a three-way pipe, and valves are respectively arranged on the pulverized coal channel, the coal gas channel and the gun body channel and are used for controlling injection media and realizing independent or common injection of pulverized coal and coal gas. The pulverized coal channel and the coal gas channel are both provided with reducing sections, the injection amount can be controlled by adjusting the pipe diameter, and the included angle of the channels is designed to be 0 degree lt. And theta is less than or equal to 90 degrees so as to optimize the blowing effect. The pulverized coal channel adopts a straight pipe section, the coal gas channel is a bent pipe section, the pipe walls of the three-way pipe and the reducing section of the pulverized coal channel are thickened so as to prolong the service life, and the reducing section is an integrated machining part and is provided with a reducing section and a broadening section so as to stabilize airflow. According to the utility model, the pulverized coal channel and the gas channel are combined, and the injection mode is flexibly switched by virtue of the valve, so that the high cost of tuyere equipment transformation is avoided, and the high-efficiency support of low-carbon operation of the blast furnace is realized.

Description

TECHNICAL FIELD

[0001] The utility model belongs to a kind of coal powder gas composite spray gun field, and relate to a kind of coal powder gas composite spray gun. BACKGROUND

[0002] As the core equipment in the steel industry, traditional blast furnaces have long been one of the main sources of carbon emissions, and the large amount of carbon dioxide generated during their operation has had a significant impact on the environment. Therefore, how to achieve effective carbon emission reduction in blast furnace production has become one of the key issues that need to be addressed in the industry, and the urgent demand for carbon reduction has driven the research and improvement of related technologies. In the blast furnace smelting process, both hydrogen and carbon can be used as key reducing agents for reducing iron ore, and the application of hydrogen has significant environmental potential. If hydrogen can be used to replace part of the traditional carbon-based reducing agent, not only can it significantly reduce the amount of carbon dioxide emissions during blast furnace operation, but also can provide a new direction and possibility for the low-carbon development of the steel industry. With the continuous progress and innovation of science and technology, more and more steel enterprises have begun to try to inject hydrogen-rich gas or coal gas from the tuyere of the blast furnace in the hope of optimizing the reduction process and reducing the carbon footprint to achieve a more environmentally friendly production mode.

[0003] However, despite the broad application prospects of this technical direction, its actual promotion and implementation face many difficulties and challenges. One of the significant problems is that the spatial position of the blast furnace tuyere is very limited, and this spatial limitation greatly restricts the applicability of traditional lance design. Traditional lances can usually only spray a single medium, and cannot simultaneously achieve the function of co-injection of pulverized coal and coal gas. In order to overcome this limitation, the current common practice is to make large-scale modifications to the tuyere equipment to adapt to the co-injection needs of pulverized coal and coal gas. However, this modification method has obvious disadvantages: on the one hand, the scale of the modification project is usually large, involving adjustment and redesign of the equipment structure, and the construction process is complex and time-consuming; on the other hand, the cost of modification is quite high, which is a considerable economic burden for many enterprises, increasing the cost threshold of technology promotion. In addition, the coaxial lance design widely used in the industry currently, while solving some problems to some extent, also has significant shortcomings. For example, the coaxial lance cannot achieve the function of separate injection of pulverized coal or coal gas, and this limitation in design greatly reduces the flexibility of operation and cannot meet the diversified needs in the production process. At the same time, the weight of the coaxial lance is generally heavy, which not only increases the difficulty of installation and maintenance, but also shortens the service life due to its structural characteristics. In actual production, due to the frequent impact of high temperature, high pressure and particle erosion on the lance, the problem of insufficient durability is particularly prominent, leading to an increase in replacement frequency and further increasing maintenance costs. More importantly, the injection effect of this lance in actual use is often not ideal, making it difficult to fully meet the requirements of low-carbon operation of blast furnaces.

[0004] In summary, the traditional lance design and the existing technical solutions of blast furnace tuyere equipment have exposed many shortcomings when facing the demand for co-injection of pulverized coal and coal gas, including spatial limitations, high modification costs, insufficient operational flexibility, short service life of the lance, and poor use effect. The existence of these technical bottlenecks not only limits the further optimization and development of low-carbon technology for blast furnaces, but also to some extent hinders the pace of the steel industry towards a more green and environmentally friendly direction. Therefore, a new technical solution is urgently needed that can achieve co-injection of pulverized coal and coal gas at low cost and high efficiency without relying on large-scale modification of the tuyere, thereby promoting the widespread application and industrialization of low-carbon technology for blast furnaces. Practical new type content

[0005] Therefore, the purpose of the present application is to provide a coal-pulverized coal gas composite lance to solve the problem of co-injection of pulverized coal and coal gas, to inject pulverized coal / gas into the blast furnace at low cost and high efficiency, and to realize online switching of pulverized coal / gas injection.

[0006] To achieve the above object, the utility model provides the following technical scheme: a kind of pulverized coal gas composite spray gun, including pulverized coal passage, gas passage, gun body passage and tee pipe, pulverized coal passage, gas passage, gun body passage are communicated with tee pipe respectively;Pulverized coal passage, gas passage and gun body passage are equipped with pulverized coal passage valve, gas passage valve and gun body passage valve respectively on it, for controlling blowing medium.

[0007] Optionally, the pulverized coal passage is provided with a pulverized coal passage variable diameter section.

[0008] Optionally, the pulverized coal passage variable diameter section is an integrated machining part.

[0009] Optionally, the pulverized coal passage variable diameter section is provided with a gradually tapered section and a gradually widened section in front and behind respectively.

[0010] Optionally, the gas passage is provided with a gas passage variable diameter section.

[0011] Optionally, the included angle θ between the pulverized coal passage and the gas passage satisfies 0° < θ ≤ 90°.

[0012] Optionally, the pulverized coal passage is a straight pipe section, and the gas passage is a bent pipe section.

[0013] The utility model has the advantages that:

[0014] 1) The utility model combines the pulverized coal passage and the gas passage together ingeniously, thereby realizing the common blowing function of pulverized coal and gas. This design not only greatly improves the flexibility of the spray gun, but also enables the operator to accurately control the blowing amount of pulverized coal and gas according to needs. Specifically, the pulverized coal passage is provided with a pulverized coal passage variable diameter section, and the gas passage is provided with a gas passage variable diameter section. By adjusting the pipe diameter size of these variable diameter sections, the flow of pulverized coal and gas can be accurately regulated.

[0015] 2) The utility model also significantly prolongs the service life of the spray gun. The service life of the traditional spray gun is usually short due to the influence of high temperature, high pressure and particle erosion. Frequent replacement not only increases the maintenance cost, but also affects the production efficiency. The pulverized coal gas composite spray gun of the utility model adopts the design of tee pipe and thickened wall of the pulverized coal passage variable diameter section, thereby enhancing the structural strength of the spray gun and effectively slowing down the wear rate. At the same time, the pulverized coal passage variable diameter section is an integrated machining part and is provided with a gradually tapered section and a gradually widened section to stabilize the airflow, thereby further reducing the impact and wear of the airflow on the inside of the spray gun, and greatly prolonging the service life of the spray gun.

[0016] In summary, the utility model combines the pulverized coal passage and the gas passage together, thereby realizing the common blowing of pulverized coal and gas, controlling the blowing amount of pulverized coal and gas, assisting in reducing carbon in blast furnace, prolonging the service life of the spray gun, and reducing the replacement cost of the spray gun and the cost of changing the tuyere equipment.

[0017] Other advantages, objects, and features of the present application will be apparent to those skilled in the art from the following specification, which is to be taken in conjunction with the accompanying drawings. The objects and other advantages of the present application can be realized and attained by the structure particularly pointed out in the specification. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to make the purpose, technical scheme and advantages of the present application clearer, the preferred embodiments of the present application will be described in detail below with reference to the drawings, in which:

[0019] Figure 1 The figure is a structural schematic diagram of the present application.

[0020] Reference signs: 1-pulverized coal passage, 2-gas passage, 3-gun body passage, 4-three-way pipe, 5-pulverized coal passage variable diameter section, 6-gas passage variable diameter section, 11-pulverized coal passage valve, 22-gas passage valve, 33-gun body passage valve. DETAILED DESCRIPTION

[0021] The embodiments of the present application will be described below through specific concrete examples, and those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the specification. The present application can also be implemented or applied through other different concrete embodiments, and each detail in the specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that the drawings provided in the following embodiments only illustrate the basic concept of the present application in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0022] Among them, the drawings are only used for exemplary illustration, and the representation is only a schematic diagram, not a physical diagram, and cannot be understood as a limitation of the present application; in order to better illustrate the embodiments of the present application, some components in the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some known structures and their descriptions in the drawings may be omitted.

[0023] The same or similar reference signs in the drawings of the embodiments of the present utility model correspond to the same or similar components; in the description of the present utility model, it is understood that if the orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "front", "back" and the like is based on the orientation or position relationship shown in the drawings, it is only for the convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, therefore the terms describing the position relationship in the drawings are only used for exemplary illustration, and cannot be understood as a limitation on the present utility model, for ordinary skilled persons in the art, the specific meanings of the above terms can be understood according to the specific circumstances.

[0024] Please refer to Figure 1 It is a kind of coal powder gas composite spray gun, including the following main components: coal powder channel 1, gas channel 2, gun body channel 3 and three-way pipe 4.Cooling channel 1 is used to transport coal powder medium, gas channel 2 is used to transport coal gas medium, and gun body channel 3 is used as the output channel of spray gun, and is connected with blast furnace tuyere, three-way pipe 4 is used to connect coal powder channel 1, gas channel 2 and gun body channel 3, to form an integrated injection system.

[0025] In the embodiment, coal powder channel 1 is provided with coal powder channel valve 7, gas channel 2 is provided with gas channel valve 8, and gun body channel 3 is provided with gun body channel valve 9.These valves are used to control the injection state of coal powder and coal gas respectively.By adjusting the opening and closing of coal powder channel valve 7, gas channel valve 8 and gun body channel valve 9, the functions of coal powder injection alone, coal gas injection alone or coal powder and coal gas injection together can be realized, so as to flexibly adapt to different needs in blast furnace production.

[0026] In the embodiment, coal powder channel 1 is provided with coal powder channel variable diameter section 5, and gas channel 2 is provided with gas channel variable diameter section 6.The design of coal powder channel variable diameter section 5 and gas channel variable diameter section 6 allows the injection amount of coal powder and coal gas to be accurately controlled by adjusting the pipe diameter size.For example, when the coal powder injection amount needs to be increased, the diameter of coal powder channel variable diameter section 5 can be increased to achieve this purpose; similarly, when the gas flow needs to be adjusted, the size of gas channel variable diameter section 6 can be changed to meet the requirements.This design can ensure the stable operation of blast furnace under different working conditions, while optimizing the injection effect.

[0027] Further, in the present embodiment, the included angle θ between the pulverized coal passage 1 and the gas passage 2 is set to 0° < θ ≤ 60°. This included angle design is optimized to effectively reduce the resistance loss of the gas during transportation, thereby improving the injection efficiency of the gas passage 2 and improving the injection effect of the mixed pulverized coal and gas. The pulverized coal passage 1 adopts a straight pipe section structure to reduce the erosion and wear of the pipe wall by the pulverized coal particles, while the gas passage 2 is designed as a bent pipe section to facilitate connection with the tee pipe 4 and the barrel passage 3, and to adapt to the spatial layout of the tuyere.

[0028] To enhance the durability of the injection lance, the wall thickness of the tee pipe 4 and the pulverized coal passage reducing section 5 is thickened to 9 mm. By thickening the pipe wall, the high-speed flow of the pulverized coal can be significantly slowed down to reduce the wear of the pipe wall, thereby prolonging the service life of the entire injection lance. In addition, the pulverized coal passage reducing section 5 is manufactured in the form of an integrated piece to avoid weak points that may occur at the welding or connection points, further improving the stability and durability of the structure. A tapered section and a broadening section are respectively provided before and after the pulverized coal passage reducing section 5. This gradual change structure can stabilize the airflow of the pulverized coal, reduce the impact of turbulence on the inside of the injection lance, thereby reducing wear and improving the uniformity of injection.

[0029] During the operation of the present embodiment, when pulverized coal needs to be injected, the operator can open the pulverized coal passage valve 7 and close the gas passage valve 8, while keeping the barrel passage valve 9 open. The pulverized coal enters the tee pipe 4 through the pulverized coal passage 1 and the pulverized coal passage reducing section 5, and finally enters the blast furnace tuyere through the barrel passage 3. When gas needs to be injected, the pulverized coal passage valve 7 is closed and the gas passage valve 8 is opened. The gas enters the tee pipe 4 through the gas passage 2 and the gas passage reducing section 6, and is then output through the barrel passage 3. If both pulverized coal and gas need to be injected, the pulverized coal passage valve 7 and the gas passage valve 8 are opened simultaneously. This flexible control method not only realizes the online switching of pulverized coal and gas, but also avoids the cumbersome process of replacing the traditional injection lance or reforming the tuyere, thereby reducing production costs.

[0030] In summary, the present embodiment provides a pulverized coal and gas composite injection lance with reasonable structure and flexible operation. Through the coordinated design of the pulverized coal passage 1, the gas passage 2, the barrel passage 3, the tee pipe 4, the pulverized coal passage reducing section 5, and the gas passage reducing section 6, combined with the control function of the pulverized coal passage valve 7, the gas passage valve 8, and the barrel passage valve 9, the injection of both pulverized coal and gas is successfully realized, the service life of the injection lance is prolonged, the use and maintenance costs are reduced, and the injection lance is suitable for the popularization and application of low-carbon technology in blast furnaces.

[0031] Finally, it is explained that the above embodiments are only used to illustrate the technical solutions of the present application and are not limited. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced by equivalents without departing from the purpose and scope of the present application, and all should be covered in the scope of the claims of the present application.

Claims

1. A pulverized coal and coal gas composite spray gun, characterized in that: It includes a pulverized coal channel, a gas channel, a gun body channel, and a T-pipe, with the pulverized coal channel, gas channel, and gun body channel each connected to the T-pipe; The pulverized coal channel, the gas channel, and the gun body channel are respectively equipped with pulverized coal channel valves, gas channel valves, and gun body channel valves for controlling the injection medium.

2. The pulverized coal and gas composite spray gun according to claim 1, characterized in that: The pulverized coal channel is equipped with a variable diameter section.

3. The pulverized coal and gas composite spray gun according to claim 2, characterized in that: The variable diameter section of the pulverized coal channel is an integrated machined component.

4. A pulverized coal and gas composite spray gun according to claim 2, characterized in that: The coal powder channel has a narrowing section and a widening section before and after the diameter-changing section.

5. A pulverized coal and gas composite spray gun according to claim 1, characterized in that: The gas passage is equipped with a variable diameter section.

6. A pulverized coal and gas composite spray gun according to claim 1, characterized in that: The included angle θ between the pulverized coal channel and the gas channel satisfies 0° < θ ≤ 90°.

7. A pulverized coal and gas composite spray gun according to claim 1, characterized in that: The pulverized coal channel is a straight pipe section, and the gas channel is a curved pipe section.

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