A waste heat boiler system suitable for a vanadium-titanium alloy smelting furnace

Abstract

The utility model relates to a waste heat boiler technical field provides a kind of waste heat boiler system suitable for vanadium titanium alloy smelting furnace, cooperate with steam turbine, it include: entrance flue;First vertical flue, the entrance of the first vertical flue with the entrance flue intercommunication, the inner wall of the first vertical flue is fixed sequentially installed with high-temperature superheater, high-temperature reheater, medium-temperature superheater, low-temperature reheater and first low-temperature superheater;Second vertical flue, the entrance of the second vertical flue with the outlet of the first vertical flue intercommunication, second low-temperature superheater, evaporator and coal economizer are fixedly installed on the inner wall of the second vertical flue;Outlet flue, the outlet flue with the outlet of the second vertical flue intercommunication.The waste heat boiler system suitable for vanadium titanium alloy smelting furnace provided by the utility model can carry out environmental protection and utilize treatment to high-temperature flue gas generated in the smelting process of vanadium titanium alloy.

Description

Technical Field

[0001] This utility model relates to the field of waste heat boiler technology, specifically to a waste heat boiler system suitable for vanadium-titanium alloy smelting furnaces. Background Technology

[0002] Vanadium-titanium alloys, due to their unique properties of high strength, corrosion resistance, high temperature resistance, and energy storage, have become irreplaceable materials in the steel industry, aerospace and high-end equipment, and new energy fields. However, vanadium and titanium are both globally scarce mineral resources, with highly concentrated distributions and often existing as associated minerals. Currently, global vanadium-titanium resources are mainly found in vanadium-titanium magnetite, where vanadium, titanium, and iron are closely associated. Furthermore, titanium oxide (TiO2) has an extremely high melting point (1843℃) and stable chemical properties, making it impossible to effectively separate vanadium and titanium using conventional steelmaking techniques.

[0003] Currently, electric arc furnaces are generally used as smelting furnaces for vanadium-titanium alloys. However, electric arc furnaces generate a large amount of high-temperature flue gas during the smelting process, requiring companies to invest heavily in environmental protection. Furthermore, the low-energy consumption and zero-emission technologies under the "dual carbon" target impose very strict environmental requirements on companies. Therefore, how to utilize and treat the high-temperature flue gas generated during the smelting process of vanadium-titanium alloys in an environmentally friendly manner is an urgent problem to be solved. Utility Model Content

[0004] In view of the deficiencies in the existing technology, the purpose of this utility model is to provide a waste heat boiler system suitable for vanadium-titanium alloy smelting furnaces, which can environmentally utilize and treat the high-temperature flue gas generated during the smelting process of vanadium-titanium alloys.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a waste heat boiler system suitable for vanadium-titanium alloy smelting furnaces, used in conjunction with a steam turbine, comprising:

[0006] Inlet flue;

[0007] The first vertical flue has an inlet connected to the inlet flue, and the inner wall of the first vertical flue is sequentially fixed with a high-temperature superheater, a high-temperature reheater, a medium-temperature superheater, a low-temperature reheater, and a first low-temperature superheater.

[0008] The second vertical flue has an inlet that is connected to the outlet of the first vertical flue, and a second low-temperature superheater, an evaporator, and an economizer are fixedly installed on the inner wall of the second vertical flue.

[0009] An outlet flue is provided, which is connected to the outlet of the second vertical flue.

[0010] Furthermore, it also includes a first radiating flue and a second radiating flue, wherein the inlet of the first radiating flue is connected to the inlet flue, the inlet of the second radiating flue is connected to the outlet of the first radiating flue, and the outlet of the second radiating flue is connected to the inlet of the first vertical flue through a connecting flue.

[0011] A first membrane water-cooled wall and a second membrane water-cooled wall are fixedly installed on the inner walls of the first and second radiant flues, respectively.

[0012] Furthermore, it also includes a water pump and a boiler drum, wherein the outlet of the water pump is connected to the inlet of the economizer, and the inlet of the boiler drum is connected to the outlet of the economizer;

[0013] The outlet of the boiler drum is connected to the inlet of the first membrane water-cooled wall, the inlet of the second membrane water-cooled wall, and the inlet of the evaporator, respectively. The outlet of the first membrane water-cooled wall, the outlet of the second membrane water-cooled wall, and the outlet of the evaporator are all connected to the inlet of the boiler drum.

[0014] The steam outlet of the boiler drum is heated by the superheater and then used to power the steam turbine.

[0015] Furthermore, the steam outlet of the boiler drum is connected to the inlet of the second low-temperature superheater, the outlet of the second low-temperature superheater is connected to the inlet of the first low-temperature superheater, the outlet of the first low-temperature superheater is connected to the inlet of the medium-temperature superheater, the outlet of the medium-temperature superheater is connected to the inlet of the high-temperature superheater, and the outlet of the high-temperature superheater is connected to the high-pressure cylinder of the steam turbine.

[0016] Furthermore, the outlet of the steam turbine is connected to the inlet of the low-temperature reheater, the outlet of the low-temperature reheater is connected to the inlet of the high-temperature reheater, and the outlet of the high-temperature reheater is connected to the low-pressure cylinder of the steam turbine.

[0017] Furthermore, it also includes a primary desuperheater, the inlet of which is connected to the outlet of the first low-temperature superheater, and the outlet of which is connected to the inlet of the medium-temperature superheater.

[0018] Furthermore, it also includes a secondary desuperheater, the inlet of which is connected to the outlet of the intermediate-temperature superheater, and the outlet of which is connected to the inlet of the high-temperature superheater.

[0019] Furthermore, it also includes a three-stage desuperheater, the inlet of which is connected to the outlet of the low-temperature reheater, and the outlet of which is connected to the inlet of the high-temperature reheater.

[0020] Furthermore, a first ash hopper is installed at the bottom of the first radiating flue, and a second ash hopper is installed at the bottom of the connecting flue.

[0021] The beneficial effects of this utility model are as follows: This utility model provides a waste heat boiler system suitable for vanadium-titanium alloy smelting furnaces. When the high-temperature flue gas generated during the smelting process of vanadium-titanium alloy passes through the first vertical flue and the second vertical flue, on the one hand, a large amount of its heat will be absorbed and utilized; on the other hand, the dust and fly ash in the high-temperature flue gas and the temperature can be reduced. Therefore, this system can carry out environmentally friendly utilization and treatment of the high-temperature flue gas generated during the smelting process of vanadium-titanium alloy. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model.

[0023] Figure reference numerals: 10-Inlet flue, 20-First vertical flue, 21-High-temperature superheater, 22-High-temperature reheater, 23-Medium-temperature superheater, 24-Low-temperature reheater, 25-First low-temperature superheater, 30-Second vertical flue, 31-Second low-temperature superheater, 32-Evaporator, 33-Economizer, 40-Outlet flue, 50-First radiant flue, 51-First ash hopper, 60-Second radiant flue, 61-Connecting flue, 62-Second ash hopper, 70-Boiler drum, 71-Water inlet pipe, 72-Water outlet pipe, 81-First steam pipe, 82-Second steam pipe, 83-Third steam pipe, 91-First stage desuperheater, 92-Second stage desuperheater, 93-Third stage desuperheater, 101-High-pressure cylinder of the steam turbine, 102-Low-pressure cylinder of the steam turbine, 103-Steam turbine outlet. Detailed Implementation

[0024] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0025] In this application, unless otherwise expressly specified and limited, the terms "connection" and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0026] In the description of this application, it should be understood that the terms "longitudinal", "horizontal", "level", "top", "bottom", "upper", "lower", "inner" and "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0027] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly defined.

[0028] like Figure 1 As shown, this utility model provides a waste heat boiler system suitable for vanadium-titanium alloy smelting furnaces, used in conjunction with a steam turbine. The steam turbine is existing technology, and its specific structure will not be described in detail here. This system includes an inlet flue 10, a first vertical flue 20, a second vertical flue 30, and an outlet flue 40.

[0029] The inlet flue 10 is connected to the exhaust port of the electric arc furnace.

[0030] The inlet of the first vertical flue 20 is connected to the inlet flue 10. The inner wall of the first vertical flue 20 is sequentially fixed with a high-temperature superheater 21, a high-temperature reheater 22, a medium-temperature superheater 23, a low-temperature reheater 24, and a first low-temperature superheater 25.

[0031] The inlet of the second vertical flue 30 is connected to the outlet of the first vertical flue 20. The inner wall of the second vertical flue is fixedly installed with a second low-temperature superheater 31, an evaporator 32 and an economizer 33.

[0032] The outlet flue 40 is connected to the outlet of the second vertical flue 30.

[0033] The specific working process of this system is as follows: the high-temperature flue gas generated during the smelting of vanadium-titanium alloy in the electric arc furnace enters the inlet flue 10. When it passes through the first vertical flue 20 and the second vertical flue 30, on the one hand, its heat is largely absorbed and utilized by the high-temperature superheater 21, high-temperature reheater 22, medium-temperature superheater 23, low-temperature reheater 24, first low-temperature superheater 25, second low-temperature superheater 31, evaporator 32 and economizer 33; on the other hand, it can also reduce the dust and fly ash and temperature in the high-temperature flue gas. Therefore, this system can carry out environmentally friendly utilization treatment of the high-temperature flue gas generated during the smelting of vanadium-titanium alloy.

[0034] In one embodiment, the system further includes a first radiating flue 50 and a second radiating flue 60. The inlet of the first radiating flue 50 is connected to the inlet flue 10, the inlet of the second radiating flue 60 is connected to the outlet of the first radiating flue 50, and the outlet of the second radiating flue 60 is connected to the inlet of the first vertical flue 20 through a connecting flue 61.

[0035] A first membrane water-cooled wall and a second membrane water-cooled wall are respectively fixedly installed on the inner walls of the first radiant flue 50 and the second radiant flue 60.

[0036] The high-temperature flue gas generated during the smelting of vanadium-titanium alloy in an electric arc furnace enters the inlet flue 10, passes through the first radiant flue 50 and the second radiant flue 60 in sequence, and then enters the first vertical flue 20. The high-temperature flue gas uses a lower flow rate in the first and second radiant flues 50 and 60 to ensure sufficient settling of dust and fly ash. After cooling through the first and second radiant flues 50 and 60, the temperature of the high-temperature flue gas is approximately 1070℃.

[0037] In this embodiment, the system also includes a water pump and a boiler drum 70. The outlet of the water pump is connected to the inlet of the economizer 33, and the inlet of the boiler drum 70 is connected to the outlet of the economizer 33 through a water supply pipe 71.

[0038] The outlet of the boiler drum 70 is connected to the inlet of the first membrane water-cooled wall, the inlet of the second membrane water-cooled wall, and the inlet of the evaporator 32 via a drain pipe 72. The outlets of the first membrane water-cooled wall, the second membrane water-cooled wall, and the evaporator 32 are all connected to the inlet of the boiler drum 70 via riser pipes.

[0039] The steam outlet of boiler drum 70 is heated by a superheater and then used to power the steam turbine.

[0040] During operation, the feedwater pump pressurizes and preheats the boiler feedwater to 278°C. The boiler feedwater enters the economizer 33, absorbs heat, and is then sent to the boiler drum 70 via the upper water pipe 71. From there, it flows through the lower water pipe 72 to the first membrane water-cooled wall, the second membrane water-cooled wall, and the evaporator 32. The heated steam-water mixture then returns to the boiler drum 70 via the riser pipe. The boiler drum 70 separates the steam and water mixture, with the saturated steam being heated to power the turbine.

[0041] In this embodiment, the steam outlet of the boiler drum 70 is connected to the inlet of the second low-temperature superheater 31 via a first steam pipe 81. The outlet of the second low-temperature superheater 31 is connected to the inlet of the first low-temperature superheater 25. The outlet of the first low-temperature superheater 25 is connected to the inlet of the medium-temperature superheater 23. The outlet of the medium-temperature superheater 23 is connected to the inlet of the high-temperature superheater 21. The outlet of the high-temperature superheater 21 is connected to the high-pressure cylinder 101 of the steam turbine.

[0042] During operation, the saturated steam separated from the boiler drum 70 enters the second low-temperature superheater 31 through the steam pipe, then enters the first low-temperature superheater 25 and the medium-temperature superheater 23, and finally enters the high-temperature superheater 21. After being heated by the high-temperature superheater 21, the parameters of the saturated steam are 571℃±5℃ and 13.7MPa. At this time, the superheated steam is output to the high-pressure cylinder 101 of the steam turbine through the second steam pipe 82, thereby providing power to the steam turbine.

[0043] In this embodiment, the steam turbine outlet 103 is connected to the inlet of the low-temperature reheater 24, the outlet of the low-temperature reheater 24 is connected to the inlet of the high-temperature reheater 22, and the outlet of the high-temperature reheater 22 is connected to the low-pressure cylinder 102 of the steam turbine through a third steam pipe 83.

[0044] During operation, low-pressure steam (temperature 357℃, pressure approximately 2.74MPa) from the turbine outlet 103 enters the low-temperature reheater 24 and is heated into superheated steam. The superheated steam then enters the high-temperature reheater 22, where it is heated to a temperature of 571℃±5℃ and a pressure of approximately 2.45MPa. This superheated steam is then output to the low-pressure cylinder 102 of the turbine via the third steam pipe 83, thus achieving the recycling of thermal energy.

[0045] In one embodiment, a primary desuperheater 91 is also included, the inlet of which is connected to the outlet of the first low-temperature superheater 25, and the outlet of the primary desuperheater 91 is connected to the inlet of the medium-temperature superheater 23.

[0046] During operation, the superheated steam discharged from the low-temperature superheater is cooled by water spraying in the first-stage desuperheater 91 before entering the medium-temperature superheater 23.

[0047] In one embodiment, a secondary desuperheater 92 is also included, the inlet of which is connected to the outlet of the intermediate-temperature superheater 23, and the outlet of which is connected to the inlet of the high-temperature superheater 21.

[0048] During operation, the superheated steam discharged from the intermediate temperature superheater 23 is cooled by water spraying in the secondary desuperheater 92 before entering the high temperature superheater 21.

[0049] In one embodiment, a three-stage desuperheater 93 is also included, with its inlet connected to the outlet of the low-temperature reheater 24 and its outlet connected to the inlet of the high-temperature reheater 22.

[0050] During operation, the superheated steam discharged from the low-temperature reheater 24 is cooled by water spraying in the three-stage desuperheater 93 before entering the high-temperature reheater 22.

[0051] In one embodiment, a first ash hopper 51 is installed at the bottom of the first radial flue 50, and a second ash hopper 62 is installed at the bottom of the connecting flue 61. The first ash hopper 51 and the second ash hopper 62 are used to collect dust and fly ash falling from the first radial flue 50, the second radial flue 60, and the first vertical flue 20. This dust and fly ash is transported to a specialized treatment device via an ash conveying device.

[0052] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model.

[0053] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A waste heat boiler system suitable for vanadium-titanium alloy smelting furnaces, used in conjunction with a steam turbine, characterized in that: include: Inlet flue; The first vertical flue has an inlet connected to the inlet flue, and the inner wall of the first vertical flue is sequentially fixed with a high-temperature superheater, a high-temperature reheater, a medium-temperature superheater, a low-temperature reheater, and a first low-temperature superheater. The second vertical flue has an inlet that is connected to the outlet of the first vertical flue, and a second low-temperature superheater, an evaporator, and an economizer are fixedly installed on the inner wall of the second vertical flue. An outlet flue is provided, which is connected to the outlet of the second vertical flue.

2. The waste heat boiler system suitable for vanadium-titanium alloy smelting furnace according to claim 1, characterized in that: It also includes a first radiating flue and a second radiating flue, the inlet of the first radiating flue being connected to the inlet flue, the inlet of the second radiating flue being connected to the outlet of the first radiating flue, and the outlet of the second radiating flue being connected to the inlet of the first vertical flue through a connecting flue. A first membrane water-cooled wall and a second membrane water-cooled wall are fixedly installed on the inner walls of the first and second radiant flues, respectively.

3. A waste heat boiler system suitable for vanadium-titanium alloy smelting furnaces according to claim 2, characterized in that: It also includes a water pump and a boiler drum, wherein the outlet of the water pump is connected to the inlet of the economizer, and the inlet of the boiler drum is connected to the outlet of the economizer; The outlet of the boiler drum is connected to the inlet of the first membrane water-cooled wall, the inlet of the second membrane water-cooled wall, and the inlet of the evaporator, respectively. The outlet of the first membrane water-cooled wall, the outlet of the second membrane water-cooled wall, and the outlet of the evaporator are all connected to the inlet of the boiler drum. The steam outlet of the boiler drum is heated by the superheater and then used to power the steam turbine.

4. A waste heat boiler system suitable for vanadium-titanium alloy smelting furnaces according to claim 3, characterized in that: The steam outlet of the boiler drum is connected to the inlet of the second low-temperature superheater, the outlet of the second low-temperature superheater is connected to the inlet of the first low-temperature superheater, the outlet of the first low-temperature superheater is connected to the inlet of the medium-temperature superheater, the outlet of the medium-temperature superheater is connected to the inlet of the high-temperature superheater, and the outlet of the high-temperature superheater is connected to the high-pressure cylinder of the steam turbine.

5. A waste heat boiler system suitable for vanadium-titanium alloy smelting furnaces according to claim 4, characterized in that: The turbine's outlet is connected to the inlet of the low-temperature reheater, the low-temperature reheater's outlet is connected to the inlet of the high-temperature reheater, and the high-temperature reheater's outlet is connected to the turbine's low-pressure cylinder.

6. A waste heat boiler system suitable for vanadium-titanium alloy smelting furnaces according to claim 5, characterized in that: It also includes a primary desuperheater, the inlet of which is connected to the outlet of the first low-temperature superheater, and the outlet of which is connected to the inlet of the medium-temperature superheater.

7. A waste heat boiler system suitable for vanadium-titanium alloy smelting furnaces according to claim 5, characterized in that: It also includes a secondary desuperheater, the inlet of which is connected to the outlet of the intermediate-temperature superheater, and the outlet of which is connected to the inlet of the high-temperature superheater.

8. A waste heat boiler system suitable for vanadium-titanium alloy smelting furnaces according to claim 5, characterized in that: It also includes a three-stage desuperheater, the inlet of which is connected to the outlet of the low-temperature reheater, and the outlet of which is connected to the inlet of the high-temperature reheater.

9. A waste heat boiler system suitable for vanadium-titanium alloy smelting furnaces according to claim 2, characterized in that: A first ash hopper is installed at the bottom of the first radiating flue, and a second ash hopper is installed at the bottom of the connecting flue.

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