A smelt reduction furnace gas treatment system

Abstract

The application discloses a molten reduction furnace coal gas treatment system, which solves the technical problem of high maintenance frequency of a waste heat boiler in the prior art. The molten reduction furnace coal gas treatment system comprises, in sequence along a flow direction of coal gas, a molten reduction furnace, a first vaporization cooling flue, a settling chamber, a cyclone dust collector, a second vaporization cooling flue and a waste heat boiler; the first vaporization cooling flue and / or the second vaporization cooling flue comprises a body provided with a pipe cavity for the flow of the coal gas; and a water cooling pipe group is located in the pipe cavity. The molten reduction furnace coal gas treatment system provided by the application reduces the temperature of the coal gas entering the waste heat boiler, reduces the risk of low-melting-point particles in the coal gas sticking to the heat exchange pipes of the waste heat boiler, and reduces the maintenance frequency of the waste heat boiler.

Description

Technical Field

[0001] This application belongs to the field of flue gas treatment technology, specifically relating to a molten reduction furnace gas treatment system. Background Technology

[0002] In the molten reduction gas treatment process, high-temperature gas exiting from the top of the molten reduction furnace first enters the vaporization cooling flue for heat exchange and cooling, reducing its temperature from the initial 1450-1600℃ to 650-750℃. Then, as the gas passes through the settling chamber, larger particles settle due to gravity. Next, the gas enters a high-temperature cyclone dust collector, which removes some of the particulate matter, lowering the gas temperature to approximately 550-650℃. This 550-650℃ gas then enters a waste heat boiler for further cooling and heat recovery. After passing through the waste heat boiler, the gas temperature drops to 100-200℃, and then it enters a gas purification device for fine dust removal. Finally, the gas pressure is reduced from 60 kPa to 15-20 kPa by a pressure regulating valve group before entering the gas pipeline network.

[0003] In the actual application of this molten reduction gas treatment system, when the gas temperature rises or the gas volume increases due to production load fluctuations or other reasons, the inlet gas temperature of the waste heat boiler may become too high, for example, exceeding 650°C. Low-melting-point particles in the gas will adhere to the heat exchange pipes of the waste heat boiler, which may cause blockage of the waste heat boiler over time, increasing the maintenance frequency. Summary of the Invention

[0004] To address the technical problems of particulate matter in the heat exchange tubes of waste heat boilers and the high maintenance frequency, this application provides a gas treatment system for molten reduction furnaces.

[0005] This application provides a molten reduction furnace gas treatment system, comprising a molten reduction furnace, a first vaporization cooling flue, a settling chamber, a cyclone dust collector, a second vaporization cooling flue, and a waste heat boiler, which are sequentially connected along the gas flow direction; the first vaporization cooling flue and / or the second vaporization cooling flue include: The main body is provided with a cavity for the gas to flow through; The water-cooled pipe assembly is located inside the pipe cavity.

[0006] In some embodiments, the water-cooled tube assembly includes a plurality of water-cooled tubes extending axially along the cavity, and the plurality of water-cooled tubes are arranged sequentially along the radial direction of the body.

[0007] In some embodiments, the water-cooled pipe assembly further includes a plurality of first connecting plates, and any two adjacent water-cooled pipes are connected through the first connecting plates; The first connecting plate is welded to the water-cooling pipe.

[0008] In some embodiments, the water-cooled pipe group further includes a first main pipe and a second main pipe, with the input end of each water-cooled pipe connected to the first main pipe and the output end of each water-cooled pipe connected to the second main pipe.

[0009] In some embodiments, multiple water-cooled pipe assemblies are provided, and the multiple water-cooled pipe assemblies are arranged around the central axis of the body.

[0010] In some embodiments, the dimension of the water-cooled tube assembly along the radial direction of the body is smaller than the radius of the body.

[0011] In some embodiments, the water-cooled pipe assembly includes an inlet section, a heat exchange section, and an outlet section that are sequentially connected along the flow direction of the cooling water. The water inlet section and the heat exchange section are arranged at an angle, and the air outlet section is also arranged at an angle to the heat exchange section. The middle portions of both the water inlet section and the air outlet section pass through the pipe wall of the main body. The input end of the water inlet section is located outside the main body, and the output end is located inside the pipe cavity. The output end of the air outlet section is located outside the main body, and the input end is located inside the pipe cavity. The heat exchange section is located inside the pipe cavity.

[0012] In some embodiments, the water inlet section and the air outlet section are located on the same side of the body.

[0013] In some embodiments, the water inlet section is connected to the outer peripheral surface of the body via a first reinforcing plate, and the air outlet section is connected to the outer peripheral surface of the body via a second reinforcing plate.

[0014] In some embodiments, the molten reduction furnace gas treatment system further includes a first water inlet pipe and a second water inlet pipe, wherein the first water inlet pipe is connected to the heat exchange pipe of the first vaporization cooling flue, and the second water inlet pipe is connected to the heat exchange pipe of the second vaporization cooling flue. The first water inlet pipe and the second water inlet pipe are respectively equipped with a first flow regulating valve and a second flow regulating valve.

[0015] According to the embodiments of this application, the molten reduction furnace gas treatment system includes a molten reduction furnace, a first vaporization cooling flue, a settling chamber, a cyclone dust collector, a second vaporization cooling flue, and a waste heat boiler, which are connected sequentially along the flow direction of the gas. The first vaporization cooling flue and / or the second vaporization cooling flue include a body and a water-cooled pipe assembly. The body is provided with a cavity for gas to flow through. The water-cooled pipe assembly is located in the cavity.

[0016] By adding a second vaporization cooling flue and water-cooled pipe assembly, the cooling capacity of the gas treatment process is improved. When the gas temperature rises, the temperature of the gas entering the waste heat boiler can be reduced, which reduces the risk of low-melting-point particles in the gas adhering to the heat exchange tubes of the waste heat boiler and reduces the maintenance frequency of the waste heat boiler. Attached Figure Description

[0017] Figure 1 A schematic diagram of the molten reduction furnace gas treatment system of this application is shown.

[0018] Figure 2 It shows Figure 1 A schematic diagram of the structure of the second vaporization cooling flue.

[0019] Figure 3 It shows Figure 2 AA diagram in the diagram.

[0020] Figure 4 It shows Figure 2 A magnified view of a portion of the image.

[0021] Explanation of reference numerals in the attached figures: 110-Melting reduction furnace, 120-First vaporization cooling flue, 130-Settling chamber, 140-Cyclone dust collector, 150-Second vaporization cooling flue, 151-Main body, 1511-Heat exchange tube, 152-Water-cooled tube assembly, 1521-Water-cooled tube, 1522-First connecting plate, 1523-Water inlet section, 1524-Heat exchange section, 1525-Gas outlet section, 1526-First main pipe, 1527-Second main pipe, 153-First reinforcing plate, 154-Second reinforcing plate, 160-Waste heat boiler, 170-Purification device, 180-Pressure regulating valve assembly. Detailed Implementation

[0022] To enable those skilled in the art to more clearly understand this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0023] This application provides a molten reduction furnace gas treatment system that can reduce the gas temperature entering the waste heat boiler when the gas temperature rises, thereby reducing the risk of low-melting-point particles in the gas adhering to the heat exchange tubes of the waste heat boiler and reducing the maintenance frequency of the waste heat boiler.

[0024] This application is described below with reference to the accompanying drawings and specific embodiments: Please see Figure 1 as well as Figure 2 The molten reduction furnace gas treatment system provided in this application embodiment includes a molten reduction furnace 110, a first vaporization cooling flue 120, a settling chamber 130, a cyclone dust collector 140, a second vaporization cooling flue 150, and a waste heat boiler 160, which are connected sequentially along the gas flow direction. The first vaporization cooling flue 120 and / or the second vaporization cooling flue 150 include a body 151 and a water-cooled pipe assembly 152. The body 151 is provided with a cavity for gas flow. The water-cooled pipe assembly 152 is located inside the cavity.

[0025] The smelting reduction furnace 110 is a piece of equipment used for ironmaking. Preheated iron ore powder and crushed coal powder enter the smelting reduction furnace through their respective injection systems. After the coal powder is injected into the molten pool, the coal begins to crack, carbon dissolves in the molten iron, gangue in the coal powder melts to form slag, and iron oxides enter the molten pool and react with carbon to produce elemental iron. At the same time, the volatiles in the coal powder and the injected nitrogen form a mixture, which meets the oxygen-enriched hot air from the upper spray gun, producing a violent combustion reaction and maintaining the high temperature of the smelting reduction furnace. The coal gas produced at the top of the smelting reduction furnace 110 is first cooled by the first vaporization cooling flue 120, then large particles settle in the settling chamber 130, while also experiencing a certain temperature drop. It then enters the cyclone dust collector 140 for further dust removal, then enters the second vaporization cooling flue 150 for further cooling, and finally enters the waste heat boiler 160 for heat exchange.

[0026] Because the molten reduction furnace gas treatment system provided in this application adds a second vaporization cooling flue 150 between the cyclone dust collector 140 and the waste heat boiler 160, the gas can be further cooled. Even if the gas temperature rises due to factors such as production load fluctuations, the newly added second vaporization cooling flue 150 improves the cooling capacity of the gas, thereby reducing the temperature of the gas entering the waste heat boiler 160. This reduces the risk of low-melting-point particles in the gas adhering to the heat exchange tubes 1511 of the waste heat boiler 160, and reduces the number of maintenance operations required for the waste heat boiler 160.

[0027] Meanwhile, in the first vaporization cooling flue 120 and / or the second vaporization cooling flue 150, a water-cooled pipe assembly 152 is installed inside the conventional vaporization cooling flue. The water in the water-cooled pipe assembly 152 can exchange heat with the flue gas, i.e., the coal gas, flowing in the pipe cavity, further reducing the temperature of the coal gas. This further reduces the temperature of the coal gas entering the waste heat boiler 160, thereby reducing the risk of low-melting-point particles in the coal gas adhering to the heat exchange tubes 1511 of the waste heat boiler 160 and reducing the number of maintenance operations for the waste heat boiler 160.

[0028] As can be seen from the above, this application improves the cooling effect of the gas by setting up a two-stage vaporization cooling flue and adding a water-cooled pipe group 152 inside at least one of the two-stage vaporization cooling flues. Even if the gas temperature suddenly rises, it can still reduce the gas temperature, reduce the risk of low melting point particles in the gas adhering to the heat exchange tubes 1511 of the waste heat boiler 160, and reduce the number of maintenance times for the waste heat boiler 160.

[0029] The following section uses the example of a water-cooled pipe assembly 152 installed in the second vaporization cooling flue 150 to further illustrate the content of this application.

[0030] The water-cooled tube assembly 152 is installed in the cavity of the vaporization cooling flue. Please refer to [link / reference]. Figure 2 The water-cooled pipe assembly 152 may include multiple water-cooled pipes 1521 extending axially along the pipe cavity. Water flows through the water-cooled pipes 1521, and the water can exchange heat with the gas in the flue, thereby reducing the temperature of the gas. The multiple water-cooled pipes 1521 extending axially along the pipe cavity reduces turbulence on the gas flow. In other embodiments, the water-cooled pipes 1521 may also have a certain angle with the axial direction of the pipe cavity, such as an acute or obtuse angle. The water inside the water-cooled pipes 1521 can still exchange heat with the gas, reducing its temperature.

[0031] In some embodiments, please refer to Figure 3 Multiple water-cooled pipes 1521 are arranged sequentially along the radial direction of the body 151, forming a row of water-cooled pipes 1521. The arrangement is compact and provides good heat exchange. In other embodiments, the multiple water-cooled pipes 1521 can also be arranged in an array of multiple rows and columns, which can also reduce the temperature of the gas.

[0032] In some embodiments, please refer to Figure 4 The water-cooled pipe assembly 152 may also include a first connecting plate 1522. Any two adjacent water-cooled pipes 1521 are connected through the first connecting plate 1522, thus forming a water-cooled pipe 1521 wall module, also known as a water-cooled membrane wall. This module can be installed and disassembled as a whole, making the assembly and disassembly of the vaporization cooling flue more convenient. In specific implementations, the first connecting plate 1522 can be welded to the water-cooled pipes 1521. The first connecting plate 1522 can extend axially along the pipe cavity, and its two opposite ends are respectively connected to the outer walls of two adjacent water-cooled pipes 1521.

[0033] In some embodiments, the water-cooled pipe assembly 152 further includes a first main pipe 1526 and a second main pipe 1527. The input end of each water-cooled pipe 1521 is connected to the first main pipe 1526, and the output end of each water-cooled pipe 1521 is connected to the second main pipe 1527. The first main pipe 1526 and the second main pipe 1527 serve as trunk lines, and each water-cooled pipe 1521 serves as a branch line, forming a main-branch-main flow pattern, which facilitates overall control of each water-cooled pipe 1521. In other embodiments, the first main pipe 1526 and the second main pipe 1527 may not be provided, and cooling of the gas can still be achieved.

[0034] In some embodiments, multiple water-cooled pipe assemblies 152 may be provided, and the multiple water-cooled pipe assemblies 152 are arranged radially around the central axis of the main body 151. The increased water volume in the water-cooled pipes 1521 increases the heat exchange area with the gas, further reducing the gas temperature. In other embodiments, the multiple water-cooled pipe assemblies 152 may also be arranged at intervals along an extension direction perpendicular to themselves, still achieving heat exchange with the gas and reducing the gas temperature.

[0035] In some embodiments, please refer to Figure 2 The radial dimension of the water-cooled pipe assembly 152 along the body 151 is smaller than the radius of the body 151. This ensures that the water-cooled pipe assembly 152 does not contact the inner wall of the body 151. When the gas flows through the water-cooled pipe assembly 152, it can still exchange heat with the heat exchange tubes 1511 on the body 151, thus guaranteeing the heat exchange effect between the heat exchange tubes 1511 and the gas. In other embodiments, the water-cooled pipe assembly 152 can also be connected to the inner wall of the body 151, still reducing the temperature of the gas.

[0036] In some embodiments, please continue reading Figure 2 The water-cooled pipe assembly 152 may include a water inlet section 1523, a heat exchange section 1524, and an air outlet section 1525 arranged sequentially along the medium flow direction. When the vaporization cooling flue extends along the height direction, the water inlet section 1523 and the heat exchange section 1524 are arranged at an angle, and the air outlet section 1525 is arranged at an angle to the heat exchange section 1524. The middle parts of the water inlet section 1523 and the air outlet section 1525 both pass through the pipe wall of the main body 151. The input end of the water inlet section 1523 is located outside the main body 151 and is connected to the first main pipe 1526. The output end is located inside the pipe cavity. The output end of the air outlet section 1525 is located outside the main body 151 and is connected to the second main pipe 1527. The input end is located inside the pipe cavity, and the heat exchange section 1524 is located inside the pipe cavity.

[0037] The heat exchange section 1524 is located inside the pipe cavity and is the main part for heat exchange with the gas. Multiple water-cooled pipes 1521 of the heat exchange section 1524 are arranged sequentially along the radial direction of the pipe cavity, and each water-cooled pipe 1521 extends along the axial direction of the pipe cavity. The water inlet section 1523 is a structure that connects the outside and inside of the heat exchange section 1524 to the vaporization cooling zone flue. Multiple water-cooled pipes 1521 of the water inlet section 1523 are arranged sequentially along the height direction, and each water-cooled pipe 1521 extends along the radial direction of the pipe cavity. The water inlet section 1523 is set at an angle to the heat exchange section 1524, so that the input end of the water inlet section 1523 can be located outside the main body 151, communicating with an external water source to send cooling water into the heat exchange section 1524. The exhaust section 1525 is a structure that connects the heat exchange section 1524 inside the vaporization cooling flue to an external structure such as a steam drum. Multiple water-cooled pipes 1521 of the exhaust section 1525 are arranged sequentially along the height direction, and each water-cooled pipe 1521 extends radially along the pipe cavity. The exhaust section 1525 is set at an angle to the heat exchange section 1524 so that the steam of the heat exchange section 1524 can be introduced into the steam drum.

[0038] In other embodiments, the vaporization cooling flue can also be bent, and the outlet end can be collinear with the heat exchange section 1524, so that steam can still be led out to the steam drum.

[0039] In some embodiments, where multiple water-cooled pipe assemblies 152 are provided, please refer to Figure 2 The water inlet section 1523 and the air outlet section 1525 are located on the same side of the main body 151, with the water inlet section 1523 at the bottom and the air outlet section 1525 at the top. This facilitates the arrangement of multiple water-cooled pipe assemblies 152 without interference between them. In other embodiments, when the number of water-cooled pipe assemblies 152 is small, such as only one, the water inlet section 1523 and the air outlet section 1525 can also be located on different sides of the main body 151. For example, the water inlet section 1523 and the air outlet section 1525 can be located on opposite sides of the main body 151, or the water inlet section 1523 and the air outlet section 1525 can be located on adjacent sides of the main body 151.

[0040] The main body 151 includes heat exchange tubes 1511 and second connecting plates. Multiple heat exchange tubes 1511 and multiple connecting plates are provided. The heat exchange tubes 1511 are arranged around the central axis of the tube cavity. The second connecting plates are staggered with the heat exchange tubes 1511. Any two adjacent heat exchange tubes 1511 are connected by the second connecting plates. Multiple second connecting plates and multiple heat exchange tubes 1511 together form a tube cavity. This is a conventional structure for a vaporization cooling flue. Based on this, a water inlet section 1523 and an air outlet section 1525 need to be inserted through the flue wall formed by the heat exchange tubes 1511 and the second connecting plates. The second connecting plates are provided with a first mounting hole and a second mounting hole. The water inlet section 1523 is inserted into the first mounting hole, and the air outlet section 1525 is inserted into the second mounting hole.

[0041] The water inlet section 1523 can be connected to the outer peripheral surface of the body 151 through the first reinforcing plate 153, and the air outlet section 1525 can be connected to the outer peripheral surface of the body 151 through the second reinforcing plate 154, which can increase the strength here and solve the problem of strength reduction caused by the opening here.

[0042] At the location where the mounting hole is set in the main body 151, the gap between two adjacent heat exchange tubes 1511 may be too small to accommodate the water inlet section 1523 and the air outlet section 1525. This can be achieved by bending the heat exchange tubes 1511 to avoid them. Alternatively, the gap between the two heat exchange tubes 1511 on both sides of the mounting hole can be increased, but this will also increase the gap between the two heat exchange tubes 1511 in other locations without mounting holes, reducing the heat exchange area.

[0043] In some embodiments, the molten reduction furnace gas treatment system further includes a first water inlet pipe and a second water inlet pipe. The first water inlet pipe is connected to the heat exchange tube 1511 of the first vaporization cooling flue 120, and the second water inlet pipe is connected to the heat exchange tube 1511 of the second vaporization cooling flue 150. The first water inlet pipe and the second water inlet pipe are respectively provided with a first flow regulating valve and a second flow regulating valve.

[0044] When the gas temperature is normal, only the opening of the first flow regulating valve can be increased, while the second flow regulating valve is adjusted to its minimum opening. The gas is primarily cooled through the first vaporization cooling flue 120, reducing the temperature entering the waste heat boiler 160. When the gas temperature rises, the openings of both the first and second flow regulating valves can be adjusted to their maximum. The gas is then cooled through the first vaporization cooling flue 120 and the second vaporization cooling flue 150 to lower its temperature, ensuring that the gas entering the waste heat boiler 160 is not too hot and reducing the risk of low-melting-point particles adhering to the waste heat boiler 160 pipes.

[0045] In some embodiments, when a water-cooled pipe assembly 152 is provided in the first vaporization cooling flue 120, the first water inlet pipe can also be connected to all water inlet sections 1523 of the water-cooled pipe assembly 152, so that the first flow regulating valve can simultaneously regulate the flow rate of the heat exchange tube 1511 and the water-cooled pipe 1521 of the first vaporization cooling flue 120. When a water-cooled pipe assembly 152 is provided in the second vaporization cooling flue 150, the second water inlet pipe can also be connected to all water inlet sections 1523 of the water-cooled pipe assembly 152 in the second vaporization cooling flue 150, so that the second flow regulating valve can simultaneously regulate the flow rate of the heat exchange tube 1511 and the water-cooled pipe 1521 of the second vaporization cooling flue 150.

[0046] The second vaporization cooling flue 150 provided in this application can be set vertically, so that the water in the heat exchange tube 1511 forms high-temperature saturated steam and enters the steam drum along the exhaust section. The steam in the steam drum can be sent to generate electricity together with the saturated steam of the waste heat boiler 160.

[0047] The molten reduction furnace gas treatment system may also include a gas purification device 170 connected in series with the waste heat boiler 160 and a pressure regulating valve group 180. After passing through the waste heat boiler 160, the gas temperature drops to 100-200℃, and then the gas enters the gas purification device 170 for fine dust removal. Finally, the gas pressure is reduced from 60kPa to 15-20kPa by the pressure regulating valve group 180 before entering the gas pipeline network. Fine dust removal of the gas can be achieved using bag filters. A second vaporization cooling flue 150 ensures that the gas temperature reaching the bag filter is below 200℃, within the working temperature range of the bag filters, thus extending the service life of the bags.

[0048] The molten reduction furnace gas treatment system provided in this application has at least the following advantages: (1) By adding a second vaporization cooling flue 150, it can be opened when the gas temperature rises, thereby reducing the gas temperature entering the waste heat boiler 160, reducing the risk of low melting point particles in the gas sticking to the heat exchange tube 1511 of the waste heat boiler 160, and reducing the maintenance frequency of the waste heat boiler 160.

[0049] (2) A water-cooled pipe group 152 is installed in the vaporization cooling flue, which further improves the cooling capacity of the vaporization cooling flue. The high-temperature saturated steam formed can be used for power generation, realizing the recovery of the sensible heat of the coal gas, which has dual significance for stabilizing production and reducing costs and increasing efficiency.

[0050] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0051] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application 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. Therefore, they should not be construed as limitations on this application.

[0052] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean 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 application according to the specific circumstances.

[0053] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0054] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A molten reduction furnace gas treatment system, characterized in that, It includes a melting reduction furnace, a first vaporization cooling flue, a settling chamber, a cyclone dust collector, a second vaporization cooling flue, and a waste heat boiler, which are connected sequentially along the flow direction of the gas; the first vaporization cooling flue and / or the second vaporization cooling flue include: The main body is provided with a cavity for the gas to flow through; The water-cooled pipe assembly is located inside the pipe cavity.

2. The molten reduction furnace gas treatment system according to claim 1, characterized in that, The water-cooled pipe assembly includes multiple water-cooled pipes extending axially along the cavity, and the multiple water-cooled pipes are arranged sequentially along the radial direction of the body.

3. The molten reduction furnace gas treatment system according to claim 2, characterized in that, The water-cooled pipe assembly also includes multiple first connecting plates, and any two adjacent water-cooled pipes are connected through the first connecting plates; The first connecting plate is welded to the water-cooling pipe.

4. The molten reduction furnace gas treatment system according to claim 2, characterized in that, The water-cooled pipe assembly also includes a first main pipe and a second main pipe. The input end of each water-cooled pipe is connected to the first main pipe, and the output end of each water-cooled pipe is connected to the second main pipe.

5. The molten reduction furnace gas treatment system according to any one of claims 1-4, characterized in that, The water-cooled pipe assembly is provided in multiple units, and the multiple water-cooled pipe assemblies are arranged around the central axis of the main body.

6. The molten reduction furnace gas treatment system according to claim 5, characterized in that, The dimension of the water-cooled pipe assembly along the radial direction of the body is smaller than the radius of the body.

7. The molten reduction furnace gas treatment system according to any one of claims 1-5, characterized in that, The water-cooled pipe assembly includes an inlet section, a heat exchange section, and an outlet section that are connected sequentially along the flow direction of the cooling water. The water inlet section and the heat exchange section are arranged at an angle, and the air outlet section is also arranged at an angle to the heat exchange section. The middle portions of both the water inlet section and the air outlet section pass through the pipe wall of the main body. The input end of the water inlet section is located outside the main body, and the output end is located inside the pipe cavity. The output end of the air outlet section is located outside the main body, and the input end is located inside the pipe cavity. The heat exchange section is located inside the pipe cavity.

8. The molten reduction furnace gas treatment system according to claim 7, characterized in that, The water inlet section and the air outlet section are located on the same side of the main body.

9. The molten reduction furnace gas treatment system according to claim 7, characterized in that, The water inlet section is connected to the outer peripheral surface of the main body through a first reinforcing plate, and the air outlet section is connected to the outer peripheral surface of the main body through a second reinforcing plate.

10. The molten reduction furnace gas treatment system according to claim 7, characterized in that, The molten reduction furnace gas treatment system also includes a first water inlet pipe and a second water inlet pipe. The first water inlet pipe is connected to the heat exchange pipe of the first vaporization cooling flue, and the second water inlet pipe is connected to the heat exchange pipe of the second vaporization cooling flue. The first water inlet pipe and the second water inlet pipe are respectively equipped with a first flow regulating valve and a second flow regulating valve.

Images