A molten reduction furnace gas treatment device

Abstract

The application discloses a molten reduction furnace coal gas treatment device, which solves the technical problem of high maintenance frequency of the existing technology that waste heat boiler heat exchange pipelines are bonded with particulate matters in coal gas. The treatment device comprises a coal gas treatment pipeline, a return pipeline and a gas pipeline network. The coal gas treatment pipeline comprises a molten reduction furnace, a first vaporization cooling flue, a cyclone dust collector, a waste heat boiler and the gas pipeline network which are sequentially connected through pipelines. The return pipeline is connected to the waste heat boiler. The input end of the return pipeline is close to the input end of the gas pipeline network. The output end of the return pipeline is close to the output end of the cyclone dust collector. The return pipeline is provided with an air blower. The molten reduction furnace coal gas treatment device provided by the application reduces the risk of particulate matter bonding with the heat exchange pipeline 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 device. 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 device, 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 adhering to the gas in the heat exchange pipes of current waste heat boilers and the high maintenance frequency, this application provides a gas treatment device for molten reduction furnaces.

[0005] This application provides a gas treatment device for a molten reduction furnace, comprising: The gas treatment pipeline includes a molten reduction furnace, a first vaporization cooling flue, a cyclone dust collector, a waste heat boiler, and a gas pipeline network, which are connected in sequence through the pipeline. A return pipeline is connected in parallel to the waste heat boiler. The input end of the return pipeline is close to the input end of the gas pipeline network, and the output end of the return pipeline is close to the output end of the cyclone dust collector. The return pipeline is equipped with an induced draft fan.

[0006] In some embodiments, the return pipeline further includes a shut-off valve connected to the induced draft fan; the gas treatment pipeline further includes a temperature sensor for detecting the gas temperature at the gas inlet of the waste heat boiler. The processing device also includes a controller, and the shut-off valve, the induced draft fan, and the temperature sensor are all electrically connected to the controller.

[0007] In some embodiments, there are two shut-off valves, namely a first shut-off valve and a second shut-off valve, which are connected in sequence along the gas flow direction.

[0008] In some embodiments, the return pipeline further includes a flow regulating valve and a flow meter for detecting the flow rate of the gas in the return pipeline, the flow regulating valve being located between the second shut-off valve and the induced draft fan; Both the flow regulating valve and the flow meter are electrically connected to the controller.

[0009] In some embodiments, the return pipeline is equipped with a one-way valve, which is located between the first shut-off valve and the second shut-off valve.

[0010] In some embodiments, the gas treatment pipeline further includes a second vaporization cooling flue; The second vaporization cooling flue is connected between the cyclone dust collector and the waste heat boiler, and the output end of the second vaporization cooling flue is close to the output end of the return pipeline.

[0011] In some embodiments, the system further includes a water source and a first branch and a second branch, wherein the water source is connected to the water channel of the first vaporization cooling flue via the first branch; and the water source is connected to the water channel of the second vaporization cooling flue via the second branch. The first branch is equipped with a first regulating valve to control its own water flow, and the second branch is equipped with a second regulating valve to control its own water flow.

[0012] In some embodiments, the gas treatment pipeline further includes a settling chamber connected in series between the first vaporization cooling flue and the cyclone dust collector.

[0013] In some embodiments, the gas treatment pipeline further includes a gas purifier located between the waste heat boiler and the gas pipeline network. The input end of the return pipeline is close to the output end of the gas purifier. In some embodiments, the gas treatment pipeline further includes a pressure regulating valve assembly located between the gas purifier and the gas pipeline network. The input end of the pressure regulating valve assembly is close to the input end of the return pipeline.

[0014] According to the molten reduction furnace gas treatment device provided in the embodiments of this application, by setting up a return pipeline and installing an induced draft fan on the return pipeline, the low-temperature gas after the waste heat boiler can be returned to the gas treatment pipeline. After the low-temperature gas is mixed with the high-temperature gas, the temperature of the gas entering the waste heat boiler is reduced, which reduces the risk of low-melting-point particles in the gas adhering to the heat exchange channel of the waste heat boiler, thereby reducing the maintenance frequency of the waste heat boiler. Attached Figure Description

[0015] Figure 1 A schematic diagram of the molten reduction furnace gas treatment device of this application is shown.

[0016] Figure 2 It shows Figure 1 A schematic diagram of the structure of the molten reduction furnace gas treatment device.

[0017] Explanation of reference numerals in the attached figures: 100 - Processing device; 110 - Gas processing pipeline; 111 - Melting reduction furnace; 112 - First vaporization cooling flue; 113 - Settling chamber; 114 - Cyclone dust collector; 115 - Second vaporization cooling flue; 116 - Waste heat boiler; 117 - Gas purifier; 118 - Pressure regulating valve group; 120 - Return pipeline; 121 - First shut-off valve; 122 - Second shut-off valve; 123 - Exhaust fan; 124 - Flow regulating valve; 125 - Flow meter; 126 - Check valve. Detailed Implementation

[0018] 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.

[0019] This application provides a gas treatment device for a molten reduction furnace, which can reduce the temperature of the gas entering the waste heat boiler, reduce the risk of low-melting-point particles in the gas adhering to the heat exchange pipes of the waste heat boiler, and reduce the maintenance frequency of the waste heat boiler.

[0020] This application is described below with reference to the accompanying drawings and specific embodiments: Please see Figure 1 as well as Figure 2The molten reduction furnace gas treatment device 100 provided in this application embodiment includes a gas treatment pipeline 110 and a return pipeline 120. The gas treatment pipeline 110 includes a molten reduction furnace 111, a first vaporization cooling flue 112, a cyclone dust collector 114, a waste heat boiler 116, and a gas pipeline network, all connected sequentially via pipes. The return pipeline 120 is connected in parallel to the waste heat boiler 116. The input end of the return pipeline 120 is close to the input end of the gas pipeline network, and the output end of the return pipeline 120 is close to the output end of the cyclone dust collector 114. The return pipeline 120 is equipped with an induced draft fan 123.

[0021] The molten reduction furnace 111 is a piece of equipment used for ironmaking. Preheated iron ore powder and crushed coal powder are separately injected into the molten reduction furnace 111 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 sent from the upper lance, producing a violent combustion reaction and maintaining the high temperature of the molten reduction furnace 111.

[0022] The gas produced at the top of the molten reduction furnace 111 contains a large amount of heat and particulate matter. Therefore, the gas is first cooled by the first vaporization cooling flue 112, which can heat some of the heat to water to form water vapor. Then it enters the cyclone dust collector 114 to remove dust and some particulate matter. After that, it enters the waste heat boiler 116 to undergo heat exchange. The gas after heat exchange is then transported to other reuse devices through the gas pipeline network, such as being sent to a hot blast stove to burn and heat air.

[0023] The return pipeline 120 is connected in parallel to the waste heat boiler 116. The input end of the return pipeline 120 is located between the waste heat boiler 116 and the gas pipeline network. Therefore, the low-temperature gas after the waste heat boiler 116 can enter the return pipeline 120. The output end of the return pipeline 120 is located between the cyclone dust collector 114 and the waste heat boiler 116. Therefore, the returned low-temperature gas can be mixed with the high-temperature gas in the main pipeline 110, which can reduce the temperature of the main pipeline gas before entering the waste heat boiler 116. During the flow of this low-temperature gas in the heat exchange pipe of the waste heat boiler 116, the low-melting-point particles have low temperature and low viscosity, and are not easy to stick to the heat exchange pipe of the waste heat boiler 116, thereby reducing the risk of blockage in the heat exchange pipe of the waste heat boiler 116 and reducing the number of maintenance operations for the waste heat boiler 116.

[0024] The output end of the return pipeline 120 is close to the output end of the cyclone dust collector 114, so the returned low-temperature coal gas will not enter the cyclone dust collector 114. This will reduce the impact on the coal gas flow rate inside the cyclone dust collector 114, improve the stability of the working process of the cyclone dust collector 114, and ensure the dust removal efficiency of the cyclone dust collector 114. At the same time, it can also reduce the amount of coal gas entering the cyclone dust collector 114 and reduce the load on the cyclone dust collector 114.

[0025] For the return pipeline 120, since the main pipeline, i.e., the gas treatment pipeline 110, runs from the input end to the output end of the waste heat boiler 116, and the main pipeline has a large gas flow rate and high pressure, under this pressure, the gas flow may enter the return pipeline 120 from the output end. The induced draft fan 123 is installed to allow the main pipeline gas after the waste heat boiler 116 to be returned to the front of the waste heat boiler 116, ensuring the gas flow direction of the return pipeline 120. Simultaneously, the flow rate of the returned gas can be adjusted by regulating the speed of the induced draft fan 123 to meet the main pipeline's requirement for low-temperature gas flow. In some embodiments, the return pipeline 120 may include a shut-off valve connected to the induced draft fan 123. The shut-off valve allows for the opening and closing of the return pipeline 120, so that the shut-off valve is only opened when the gas temperature in the gas treatment pipeline 110 is too high, saving wear and tear on the induced draft fan 123 and extending its service life. In other embodiments, a shut-off valve may not be installed on the return pipe 120, keeping the return pipe 120 in a continuous state. This can also reduce the temperature of the gas entering the waste heat boiler 116, thereby reducing the risk of blockage in the heat exchange pipes of the waste heat boiler 116 and reducing the number of maintenance operations required for the waste heat boiler 116.

[0026] In some embodiments, the processing device 100 may further include a controller, and the gas processing pipeline 110 may further include a temperature sensor for detecting the gas temperature at the gas inlet of the waste heat boiler; the shut-off valve, the induced draft fan 123, and the temperature sensor are all electrically connected to the controller. The temperature sensor acquires the gas temperature at the gas inlet of the waste heat boiler 116 and transmits the temperature signal to the controller. The controller can then control the opening and closing of the shut-off valve and the operation of the induced draft fan 123 based on the temperature, thus automatically controlling the operation of the induced draft fan 123 and the shut-off valve, achieving a high degree of automation. In other embodiments, the shut-off valve and the induced draft fan 123 can also be manually opened, allowing the low-temperature gas to be returned to the main pipeline.

[0027] In some embodiments, please continue reading Figure 2Two shut-off valves can be provided, namely a first shut-off valve 121 and a second shut-off valve 122. Along the gas flow direction, the first shut-off valve 121, the induced draft fan 123, and the second shut-off valve 122 are connected in sequence. Shut-off valves are installed at both the input and output ends of the induced draft fan 123. If one shut-off valve is damaged, the other shut-off valve can still operate, thereby improving the stability and reliability of the processing device 100.

[0028] Without these two shut-off valves, if the induced draft fan 123 malfunctions, the gas from the gas treatment pipeline 110 will bypass the waste heat boiler 116 and directly enter the downstream via the return pipeline 120, causing production shutdowns for downstream users. Therefore, installing two shut-off valves effectively isolates the return pipeline 120 from the main gas treatment pipeline 110. In the event of a malfunction in the induced draft fan 123, the first shut-off valve 121 and the second shut-off valve 122 can be used to close and cut off the return pipeline 120, allowing for maintenance of the induced draft fan 123. This ensures that the treatment unit 100 can still operate without affecting downstream user production.

[0029] In some embodiments, the return pipeline 120 may further include a flow regulating valve 124 and a flow meter 125 for detecting the flow rate of the gas. The flow regulating valve 124 is located between the second shut-off valve 122 and the induced draft fan 123. Both the flow regulating valve 124 and the flow meter 125 are electrically connected to the controller. By setting the flow meter 125 and the flow regulating valve 124, the controller can automatically adjust the opening of the flow regulating valve 124, thereby coordinating with the fan to adjust the flow rate of the low-temperature gas and meet the cooling requirements of the high-temperature gas. In other embodiments, the flow regulating valve 124 may also be integrated with the flow meter 125 to form an integrated regulating valve with flow detection and flow regulation, which simplifies the structure and improves space utilization.

[0030] In some embodiments, please refer to Figure 2 The return pipeline 120 may be equipped with a check valve 126. The check valve 126 ensures that gas flows only from the input end to the output end of the return pipeline 120, improving the stability of gas flow within the return pipeline 120. In some embodiments, the check valve 126 may be positioned between the second shut-off valve 122 and the first shut-off valve 121. This allows for maintenance in case of a malfunction, by closing both the second shut-off valve 122 and the first shut-off valve 121, isolating the check valve 126 from the system without shutting down the entire unit.

[0031] In some embodiments, please continue reading Figure 2The gas treatment pipeline 110 may also include a second vaporization cooling flue 115, which is connected between the cyclone dust collector 114 and the waste heat boiler 116. The output end of the second vaporization cooling flue 115 is close to the output end of the return pipeline 120.

[0032] The second vaporization cooling flue 115 can further cool the gas discharged from the cyclone dust collector 114. In this way, even if the gas discharged from the melting reduction furnace 111 is too hot, it can be cooled by the second vaporization cooling flue 115, so that the gas temperature entering the waste heat boiler 116 will not be too high, reducing the risk of particulate matter sticking to the heating pipes of the waste heat boiler 116. Furthermore, the second vaporization cooling flue 115 can be used in conjunction with the return pipe 120. When the gas temperature entering the waste heat boiler 116 is greater than the first set value but less than the second set value, the induced draft fan 123 of the return pipe 120 can be turned on to mix the low-temperature gas with the high-temperature gas, thereby reducing the inlet gas temperature entering the waste heat boiler 116. When the gas temperature entering the waste heat boiler 116 is not less than the second set value, simply reducing the gas temperature in the gas treatment pipe 110 through the return pipe 120 is still too high. Therefore, both the induced draft fan 123 of the return pipe 120 and the cooling water of the second vaporization cooling flue 115 can be turned on. The two work together to reduce the temperature of the main gas, reducing the risk of particulate matter adhering to the heating pipes of the waste heat boiler 116; at the same time, efficient recovery of gas heat is also achieved. The first set value is less than the second set value.

[0033] In other embodiments, the second vaporization cooling flue 115 may not be provided, but the gas temperature in the gas treatment pipeline 110 can still be reduced to a certain extent, thereby reducing the risk of particulate matter adhering to the heating pipes of the waste heat boiler 116.

[0034] The second vaporization cooling flue 115 can be set vertically, so that the water in the flue forms high-temperature saturated steam that can move upward to the steam drum, and the steam in the steam drum can be sent together with the saturated steam of the waste heat boiler 116 to generate electricity.

[0035] In some embodiments, the processing device 100 may further include a water source and a first branch and a second branch (not shown in the figure). The water source is connected to the water channel of the first vaporization cooling flue 112 through the first branch; the water source is connected to the water channel of the second vaporization cooling flue 115 through the second branch; the first branch is provided with a first regulating valve to control its own water flow rate, and the second branch is provided with a second regulating valve to control its own water flow rate.

[0036] Water is supplied to the water channels of the first vaporization cooling flue 112 and the second vaporization cooling flue 115 via two branch lines, and each branch line is equipped with a flow regulating valve, allowing the valve opening to be controlled according to cooling requirements. The presence of regulating valves on both the first and second branch lines enables independent control of the water flow in the water channels of the first vaporization cooling flue 112 and the second vaporization cooling flue 115, ensuring that the flow does not interfere with each other.

[0037] When the gas temperature entering the waste heat boiler 116 is normal, for example, if the gas temperature entering the waste heat boiler 116 is not greater than the first set value, the opening of the first regulating valve can be increased, while the second regulating valve can be adjusted to its minimum opening. The gas is cooled primarily through the first vaporization cooling flue 112, thus reducing the temperature entering the waste heat boiler 116. When the gas temperature increases, for example, if the gas temperature entering the waste heat boiler 116 is not less than the second set value, the openings of the first and second regulating valves can be adjusted to their maximum. The gas is cooled through the first vaporization cooling flue 112 and the second vaporization cooling flue 115 to reduce the gas temperature, ensuring that the gas temperature entering the waste heat boiler 116 is not too high and reducing the risk of low-melting-point particles adhering to the pipes of the waste heat boiler 116.

[0038] The vaporization cooling flue has a cavity for flue gas flow. Water channels are installed within the flue wall. As cooling water flows through the water channels and flue gas flows through the cavity, heat exchange occurs between the flue gas and cooling water, causing the flue gas to cool down and the cooling water to heat up, forming steam. The vaporization cooling flue is a common structure in converter flue gas treatment systems; further details can be found in existing technical disclosures and will not be elaborated upon here.

[0039] In some embodiments, please refer to Figure 2 The gas treatment pipeline 110 may also include a settling chamber 113, which is connected in series between the first vaporization cooling flue 112 and the cyclone dust collector 114. The settling chamber 113 allows large particles in the gas cooled by the first vaporization cooling flue 112 to settle, thus completing coarse dust removal.

[0040] In some embodiments, please refer to Figure 2The gas treatment pipeline 110 may also include a gas purifier 117, located between the waste heat boiler 116 and the gas pipeline network; the input end of the return pipeline 120 is close to the output end of the gas purifier 117. The cooled gas discharged from the waste heat boiler 116, after being treated by the gas purifier 117, can reduce the small particles in the gas, meeting downstream utilization needs. In other words, the gas purifier 117 can perform fine dust removal on the gas, further reducing the particulate content. The gas purifier 117 can use a bag filter. Due to the presence of the return pipeline 120 and / or the second vaporization cooling flue 115, the gas temperature reaching the bag filter is below 200℃, within the working temperature range of the bag filter, extending the service life of the bag filter. Using the low-temperature gas after the gas purifier 117 as the return gas source can reduce the particulate content in the main gas pipeline, further reducing the risk of blockage in the heating pipeline of the waste heat boiler 116.

[0041] In some embodiments, please refer to Figure 2 The gas treatment pipeline 110 may also include a pressure regulating valve assembly 118, which is located between the gas purifier 117 and the gas pipeline network; the input end of the pressure regulating valve assembly 118 is close to the input end of the return pipeline 120. The pressure regulating valve assembly 118 can regulate the pressure of the gas to meet the pressure requirements of downstream applications.

[0042] The operation process of the molten reduction furnace gas treatment device 100 provided in this application is described below: When the temperature of the gas entering the waste heat boiler 116 is not greater than the first set value, the first regulating valve can be adjusted to the maximum opening, the second regulating valve can be adjusted to the minimum opening, and the first shut-off valve 121 and the second shut-off valve 122 on the return pipeline 120 are both in the closed state, and the gas of the molten reduction furnace 111 is cooled by the first vaporization cooling flue 112.

[0043] When the temperature of the gas entering the waste heat boiler 116 is greater than the first set value but less than the second set value, the first regulating valve remains at its maximum opening, the second regulating valve remains at its minimum opening, the first shut-off valve 121 and the second shut-off valve 122 on the return pipeline 120 are opened, the induced draft fan 123 is turned on, and the gas from the molten reduction furnace 111 is cooled by the first vaporization cooling flue 112. At the same time, the low-temperature gas after the gas purifier 117 is returned to the gas treatment pipeline 110. The two work together to cool the gas and reduce the risk of low-melting-point particles adhering to the pipeline of the waste heat boiler 116.

[0044] When the temperature of the gas entering the waste heat boiler 116 is not less than the second set value, the first regulating valve remains at its maximum opening, the second regulating valve is adjusted to its maximum opening, the first shut-off valve 121 and the second shut-off valve 122 on the return pipeline 120 remain open, and the induced draft fan 123 is also open. The gas from the molten reduction furnace 111 is cooled by the first vaporization cooling flue 112 and the second vaporization cooling flue 115. At the same time, the low-temperature gas after the gas purifier 117 is returned to the gas treatment pipeline 110. The three work together to cool the gas and reduce the risk of low-melting-point particles adhering to the pipeline of the waste heat boiler 116.

[0045] The molten reduction furnace gas treatment device 100 provided in this application has at least the following advantages: (1) By adding a return pipeline 120, the low-temperature gas (temperature of about 100℃~200℃) after the gas purifier 117 is returned to the gas inlet of the waste heat boiler 116 of the gas treatment pipeline 110. When the gas temperature rises and the gas volume increases due to production load fluctuations or other reasons, it is mixed with the gas in the main pipeline, reducing the temperature of the gas entering the waste heat boiler 116 to below 650℃, thereby reducing the risk of low melting point particles in the gas sticking to the heat exchange pipeline of the waste heat boiler 116 and reducing the maintenance frequency of the waste heat boiler 116.

[0046] (2) The output end of the return pipeline 120 is set in front of the gas inlet of the waste heat boiler 116, which can ensure that the high temperature gas of the main pipeline and the low temperature gas of the return pipeline 120 can be fully mixed and reduced to below 650°C after entering the smoke box of the waste heat boiler 116.

[0047] (3) A second vaporization cooling flue 115 is set up to cooperate with the return pipeline 120. Under different gas temperatures, only the return pipeline 120 can be opened, or both the return pipeline 120 and the second vaporization cooling flue 115 can be opened, which further improves the stability of the gas temperature entering the waste heat boiler 116 under gas temperature fluctuations and reduces the maintenance frequency of the waste heat boiler 116; at the same time, it improves the efficient utilization of gas waste heat. (4) This application provides a more reasonable molten reduction furnace gas treatment device 100, which can not only ensure the stable operation of each device, but also fully recover the sensible heat of the gas, which has dual significance for stable production and cost reduction and efficiency improvement.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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 gas treatment device for a molten reduction furnace, characterized in that, include: The gas treatment pipeline includes a molten reduction furnace, a first vaporization cooling flue, a cyclone dust collector, a waste heat boiler, and a gas pipeline network, which are connected in sequence through the pipeline. A return pipeline is connected in parallel to the waste heat boiler. The input end of the return pipeline is close to the input end of the gas pipeline network, and the output end of the return pipeline is close to the output end of the cyclone dust collector. The return pipeline is equipped with an induced draft fan.

2. The molten reduction furnace gas treatment device according to claim 1, characterized in that, The return pipeline also includes a shut-off valve, which is connected to the induced draft fan; the gas treatment pipeline also includes a temperature sensor for detecting the gas temperature at the gas inlet of the waste heat boiler. The processing device also includes a controller, and the shut-off valve, the induced draft fan, and the temperature sensor are all electrically connected to the controller.

3. The molten reduction furnace gas treatment device according to claim 2, characterized in that, There are two shut-off valves, namely a first shut-off valve and a second shut-off valve. Along the flow direction of the gas, the first shut-off valve, the induced draft fan, and the second shut-off valve are connected in sequence.

4. The molten reduction furnace gas treatment device according to claim 3, characterized in that, The return pipeline also includes a flow regulating valve and a flow meter for detecting the gas flow rate of the return pipeline. The flow regulating valve is located between the second shut-off valve and the induced draft fan. Both the flow regulating valve and the flow meter are electrically connected to the controller.

5. The molten reduction furnace gas treatment device according to claim 3, characterized in that, The return pipeline is equipped with a one-way valve, which is located between the first shut-off valve and the second shut-off valve.

6. The gas treatment apparatus for a molten reduction furnace according to any one of claims 1-5, characterized in that, The gas treatment pipeline also includes a second vaporization cooling flue; The second vaporization cooling flue is connected between the cyclone dust collector and the waste heat boiler, and the output end of the second vaporization cooling flue is close to the output end of the return pipeline.

7. The molten reduction furnace gas treatment device according to claim 6, characterized in that, It also includes a water source and a first branch and a second branch, wherein the water source is connected to the water channel of the first vaporization cooling flue through the first branch; and the water source is connected to the water channel of the second vaporization cooling flue through the second branch. The first branch is equipped with a first regulating valve to control its own water flow, and the second branch is equipped with a second regulating valve to control its own water flow.

8. The gas treatment apparatus for a molten reduction furnace according to any one of claims 1-5, characterized in that, The gas treatment pipeline also includes a settling chamber, which is connected in series between the first vaporization cooling flue and the cyclone dust collector.

9. The gas treatment apparatus for a molten reduction furnace according to any one of claims 1-5, characterized in that, The gas treatment pipeline also includes a gas purifier, which is located between the waste heat boiler and the gas pipeline network. The input end of the return pipeline is close to the output end of the gas purifier.

10. The molten reduction furnace gas treatment device according to claim 9, characterized in that, The gas treatment pipeline also includes a pressure regulating valve group, which is located between the gas purifier and the gas pipeline network. The input end of the pressure regulating valve assembly is close to the input end of the return pipeline.

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