A steam-coupled ignition and heat preservation furnace

Abstract

This invention provides a steam-coupled ignition and heat preservation furnace, comprising a furnace body, a preheating component, an ignition component, and a heat preservation component. The furnace body includes a preheating section, an ignition section, and a heat preservation section. The air inlet ends of both the preheating and heat preservation components are used to receive hot steam at a preheating temperature. Thus, a sintering trolley carrying a mixture of sintered ore first passes through the preheating section, where the sintered ore is fully preheated by the hot steam emitted from the preheating component. After preheating, the ignition intensity decreases, and the steam preheating increases the heat transfer of the material layer and is accompanied by a "water-gas" reaction. This allows the surface-ignited combustion zone of the material layer to move better downwards under the action of the exhaust system, improving the ignition effect. After ignition, the hot steam emitted from the heat preservation component reacts with the high-temperature carbon-based solid fuel in the material layer, thereby improving the combustion efficiency of the carbon-based fuel and the uniformity of the combustion layer.

Description

Technical Field

[0001] This utility model relates to the field of ignition and heat preservation technology for sintered ore, and in particular to a steam-coupled ignition and heat preservation furnace. Background Technology

[0002] The ignition and holding furnace is a core piece of equipment in the sintering production line of the iron and steel metallurgy industry. Its performance directly determines the output, quality and ignition energy consumption of sintered ore.

[0003] Existing ignition and heat preservation furnaces typically have both ignition and heat preservation functions. Ignition is used to ignite the solid carbon-based fuel on the surface of the sintered ore mixture to sinter the lower layer of material, and heat preservation is used to maintain the temperature to promote the continuous combustion of the solid fuel. In order to reach a sufficient ignition point for sintering, the furnace needs to stay at the ignition point for a long time and achieve a high ignition intensity, which increases ignition energy consumption and reduces production efficiency. Heat preservation is achieved by using hot air or hot flue gas to heat the sintered ore layer or by using heat exchangers or adding heat preservation burners. However, the heat preservation effect is generally poor and it is impossible to maintain uniform heating, which may affect the stability of sintering quality.

[0004] Therefore, it is necessary to propose a steam-coupled ignition and heat preservation furnace to solve or at least alleviate the above-mentioned defects. Utility Model Content

[0005] The main purpose of this utility model is to provide a steam-coupled ignition and heat preservation furnace to solve the problems of excessive ignition time in existing ignition and heat preservation furnaces, which affect production efficiency and ignition energy consumption, and have mediocre heat preservation effect.

[0006] To achieve the above objectives, this utility model provides a steam-coupled ignition and heat preservation furnace, comprising a furnace body and a preheating assembly, an ignition assembly, and a heat preservation assembly, all connected to the furnace body; wherein, The bottom of the furnace body has a conveying space for the sintering trolley to pass through. The furnace body includes a preheating section, an ignition section, and a heat preservation section arranged sequentially along the conveying direction of the sintering trolley. The preheating component is connected to the preheating section, the ignition component is connected to the ignition section, and the heat preservation component is connected to the heat preservation section. The air inlet end of the preheating component and the air inlet end of the heat preservation component are used to introduce hot steam with preheating temperature through pipes. The air outlet end of the preheating component, the ignition end of the ignition component, and the air outlet end of the heat preservation component are all arranged vertically at intervals above the sintering trolley and their openings face the sintering trolley. The heat preservation component is located at the end of the heat preservation section away from the ignition section.

[0007] Preferably, the preheating assembly includes multiple preheating units arranged side-by-side along the conveying direction of the sintering trolley, and the preheating section is a cantilever structure protruding outward from the ignition section; wherein, Each of the preheating units includes a preheating jet pipe array and multiple preheating nozzles spaced apart along the width direction of the sintering trolley. The preheating nozzles are connected to the cantilever structure. The preheating jet pipe array is connected to the top of the preheating nozzles and communicates with the interior of the multiple preheating nozzles. The air inlet of the preheating jet pipe array is used to receive hot steam with preheating temperature through a pipe. The air outlet of the preheating nozzles passes through the cantilever structure and opens towards the sintering trolley.

[0008] Preferably, the insulation component includes multiple insulation units arranged side by side along the conveying direction of the sintering trolley. Each insulation unit includes an insulation spray pipe array and multiple insulation nozzles spaced apart along the width direction of the sintering trolley. The insulation nozzles are internally connected to the insulation section of the furnace body. The insulation spray pipe array is connected to the top of the insulation nozzles and communicates with the interior of the multiple insulation nozzles. The air inlet end of the insulation spray pipe array is used to access hot steam with a preheating temperature through a pipe. The bottom end of the insulation section has an air outlet corresponding to each insulation nozzle. The air outlet end of the insulation nozzle is flush with the air outlet.

[0009] Preferably, the outlet end of the heat-insulating nozzle is funnel-shaped, narrow at the top and wide at the bottom.

[0010] Preferably, the length of the heat preservation section is greater than the length of the ignition section.

[0011] Preferably, it also includes a flow monitoring system, which is connected to the preheating jet pipe bank and the insulated jet pipe bank for connecting to hot steam. The flow monitoring system includes a flow meter and a flow control valve arranged sequentially in the flow direction of the self-heating steam.

[0012] Preferably, the flow monitoring system further includes a shut-off valve, and the shut-off valve is provided between the preheating jet pipe bank, the heat-insulating jet pipe bank and the flow control valve.

[0013] Preferably, the preheating temperature of the hot steam is 150℃~320℃.

[0014] Preferably, the preheating assembly has two preheating units, and the insulation assembly has four insulation units.

[0015] Preferably, it also includes a protective cover, which is connected to the outside of the preheating section to cover the space between the preheating section and the sintering trolley.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This utility model provides a steam-coupled ignition and heat preservation furnace, including a furnace body and a preheating component, an ignition component, and a heat preservation component all connected to the furnace body. The bottom of the furnace body has a conveying space for the passage of the sintering trolley. The furnace body includes a preheating section, an ignition section, and a heat preservation section arranged sequentially along the conveying direction of the sintering trolley. The preheating component is connected to the preheating section, the ignition component is connected to the ignition section, and the heat preservation component is connected to the heat preservation section. The air inlet end of the preheating component and the air inlet end of the heat preservation component are used to introduce hot steam with preheating temperature through pipes. The air outlet end of the preheating component, the ignition end of the ignition component, and the air outlet end of the heat preservation component are all arranged vertically at intervals above the sintering trolley and open towards the sintering trolley. The heat preservation component is located at the end of the heat preservation section away from the ignition section. The sintering trolley carrying the sintered ore mixture first passes through the preheating section. Under the action of hot steam emitted from the preheating components, the sintered ore is fully preheated. After preheating, the ignition intensity decreases. At the same time, steam preheating increases the heat transfer of the material layer and is accompanied by a "water-gas" reaction. This allows the surface-ignited combustion zone of the material layer to move better downwards under the action of the exhaust system, improving the ignition effect. After ignition, under the action of hot steam emitted from the insulation components, the steam reacts with the high-temperature carbon-based solid fuel in the material layer through a "water-gas" reaction, which interacts with the combustion layer in the material layer. This improves the combustion efficiency of the carbon-based fuel and the uniformity of the combustion layer, thereby reducing the proportion of the original solid carbon-based fuel in the sintered ore and promoting the conversion of CO to CO2, thus reducing CO pollutants in the sintering flue gas. Furthermore, the insulation components are set far away from the ignition section to avoid interfering with the initial combustion stability and to make full use of the residual heat of the ignition section combined with the hot steam of the insulation section to better improve the insulation performance. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a perspective view of the overall structure of this utility model in an application scenario according to one embodiment; Figure 2 This is a cross-sectional schematic diagram of the preheating section in one embodiment of the present invention; Figure 3 This is a connection diagram of the flow monitoring system of the insulation component in one embodiment of the present invention.

[0019] The purpose, features, and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings.

[0020] Explanation of icon numbers: 10. Furnace body; 110. Preheating section; 120. Ignition section; 130. Insulation section; 140. Preheating unit; 141. Preheating jet pipe array; 142. Preheating nozzle; 150. Insulation unit; 151. Insulation jet pipe array; 152. Insulation nozzle; 210. Flow meter; 220. Flow control valve; 230. Shut-off valve; 30. Sintering trolley. Detailed Implementation

[0021] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0024] Furthermore, the use of terms such as "first" and "second" in this utility model 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, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0025] Please see the appendix Figure 1-3 This utility model provides a steam-coupled ignition and heat preservation furnace in one embodiment, comprising a furnace body 10 and a preheating assembly, an ignition assembly, and a heat preservation assembly all connected to the furnace body 10. It should be noted that the "order" in the text refers to the arrival and departure positions of the sintering trolley 30, respectively, and the specific arrangement is as follows: The bottom of the furnace body 10 has a conveying space for the sintering trolley 30 to pass through. The furnace body 10 includes a preheating section 110, an ignition section 120, and a heat preservation section 130 arranged sequentially along the conveying direction of the sintering trolley 30. The preheating component is connected to the preheating section 110, the ignition component is connected to the ignition section 120, and the heat preservation component is connected to the heat preservation section 130. The air inlet end of the preheating component and the air inlet end of the heat preservation component are used to introduce hot steam with preheating temperature through pipes. The air outlet end of the preheating component, the ignition end of the ignition component, and the air outlet end of the heat preservation component are arranged vertically at intervals above the sintering trolley 30 and open towards the sintering trolley 30. The heat preservation component is located at the end of the heat preservation section 130 away from the ignition section 120.

[0026] Specifically, the steam-coupled ignition and heat preservation furnace of this application includes a furnace body 10, a preheating component, an ignition component, and a heat preservation component. The furnace body 10 is used to install each component. A conveying space is provided at the bottom of the furnace body 10 for the passage of the sintering trolley 30. After the sintering trolley 30 carrying the sintered ore mixture passes through, the sintered ore mixture undergoes different action stages under the action of different components. These mainly include a preheating section 110, an ignition section 120, and a heat preservation section 130 arranged sequentially along the conveying direction of the sintering trolley 30. It can be understood that each section is equipped with a corresponding component. When the sintering trolley 30 first enters the preheating section 110, The sinter is fully preheated by the hot steam emitted from the preheating component. After preheating, the ignition intensity decreases. At the same time, steam preheating increases the heat transfer of the material layer and is accompanied by a "water-gas" reaction, which allows the surface-ignited combustion zone of the material layer to move better downwards under the action of the exhaust system, improving the ignition effect. Therefore, the air inlet of the preheating component needs to be connected to hot steam with a certain preheating temperature to achieve the preheating effect. The ignition section 120 provides a high-temperature flame to quickly ignite the solid carbon-based fuels (such as pulverized coal and coke powder) in the surface sinter mixture, forming a combustion layer. The negative pressure generated by the exhaust system transfers heat from top to bottom, causing the combustion layer to move downwards. The ignition component can be a conventional combustion igniter, with an opening to allow combustible gases such as coal gas to be introduced for ignition and combustion. This is well known to those skilled in the art and will not be described in detail here. The main function of the insulation section 130 is to maintain the surface temperature of the material layer, promote the continuous combustion of solid fuel, and prevent the surface sinter from cooling rapidly and becoming brittle, thereby increasing the yield. This is usually achieved by using hot air or hot flue gas to heat the sinter layer, or by using a heat exchanger or adding insulated burners. However, this method generally has limited insulation effect and cannot maintain uniform heating. The application utilizes the hot steam emitted from the insulation component to conduct a "water-gas" reaction with the high-temperature carbon-based solid fuel in the material layer, thereby interacting with the combustion layer in the material layer. This improves the combustion efficiency and uniformity of the carbon-based fuel, thereby reducing the proportion of the original solid carbon-based fuel in the sinter and promoting the conversion of CO to CO2, thus reducing CO pollutants in the sintering flue gas (i.e., C+H2O→CO+H2, CO+H2O→CO2+H2). Therefore, the air inlet of the insulation component also needs to be connected to hot steam. The hot steam used for preheating and insulation can maintain the preheating temperature at 150℃~320℃.

[0027] Therefore, the target of each component is the sintered ore mixture. Thus, the air outlet of the preheating component, the ignition end of the ignition component, and the air outlet of the heat preservation component must all be set facing the sintering trolley 30 to ensure the effect. Furthermore, when setting the heat preservation component, it can be set at the end of the heat preservation section 130 away from the ignition section 120. In this way, when it leaves the ignition section 120, it is accompanied by the residual heat of the ignition section 120 to retain a certain temperature. After traveling a certain distance, it arrives at the heat preservation section 130, where it is kept warm by the heat preservation component. This improves the heat preservation effect and duration. At the same time, setting it away from the ignition section 120 can also avoid interfering with the initial combustion stability and avoid affecting the sintering process.

[0028] In a preferred embodiment of this utility model, the preheating assembly includes multiple preheating units 140 arranged side by side along the conveying direction of the sintering trolley 30. The preheating section 110 is a cantilever structure protruding outward from the ignition section 120. Each preheating unit 140 includes a preheating jet pipe array 141 and multiple preheating nozzles 142 spaced apart along the width direction of the sintering trolley 30. The preheating nozzles 142 are connected to the cantilever structure. The preheating jet pipe array 141 is connected to the top of the preheating nozzles 142 and communicates with the interior of the multiple preheating nozzles 142. The air inlet of the preheating jet pipe array 141 is used to access hot steam with a preheating temperature through a pipe. The air outlet of the preheating nozzles 142 passes through the cantilever structure and opens towards the sintering trolley 30.

[0029] It should be noted that the preheating assembly adopts a method of arranging multiple preheating units 140 side by side to improve the preheating coverage. Considering the structural characteristics of the furnace body 10 and the need to facilitate the formation of a preheating and then ignition method, a cantilever structure is formed by protruding outward from the ignition section 120 of the furnace body 10 along the travel path of the sintering trolley 30. The cantilever structure is used for the installation and connection of the preheating units 140. Specifically, each preheating unit 140 includes a preheating jet pipe row 141 and multiple preheating nozzles 142 spaced apart along the width direction of the sintering trolley 30. The preheating jet pipe row 141 is used to receive hot steam as a hot steam collection source, and then sprays it out through each preheating nozzle 142 to the surface of the sintered ore on the sintering trolley 30 for preheating. During installation, the air outlet of the preheating nozzle 142 needs to penetrate through the bottom end of the cantilever structure to extend into it. The distance between it and the sintering trolley 30 can be set by those skilled in the art as needed, and then fixed and connected after setting.

[0030] In a preferred embodiment of this utility model, the heat preservation component includes multiple heat preservation units 150 arranged side by side along the conveying direction of the sintering trolley 30. Each heat preservation unit 150 includes a heat preservation spray pipe row 151 and multiple heat preservation nozzles 152 arranged at intervals along the width direction of the sintering trolley 30. The heat preservation nozzles 152 are internally connected to the heat preservation section 130 of the furnace body 10. The heat preservation spray pipe row 151 is connected to the top of the heat preservation nozzles 152 and communicates with the interior of the multiple heat preservation nozzles 152. The air inlet end of the heat preservation spray pipe row 151 is used to access hot steam with a preheating temperature through a pipe. The bottom end of the heat preservation section 130 is provided with an air outlet corresponding to each heat preservation nozzle 152. The air outlet end of the heat preservation nozzle 152 is flush with the air outlet.

[0031] It should be noted that, similar to the preheating component, the insulation component also employs multiple insulation units 150 to increase the insulation coverage. The insulation unit 150 is combined with a jet pipe array and nozzles, specifically including an insulation jet pipe array 151 and multiple insulation nozzles 152 spaced apart along the width of the sintering trolley 30. It is directly installed within the insulation section 130 of the furnace body 10. The jet pipe array is used to receive hot steam, also serving as a hot steam collection source, which is then sprayed out through the various insulation nozzles 152 and dispersed onto the surface of the sintering furnace of the sintering trolley 30. Preheating is performed; during installation, a heat preservation channel needs to be set inside the furnace body 10 for each heat preservation nozzle 152 to be installed, so that it extends to the bottom of the furnace body 10 to form an air outlet, so that the air outlet end of the heat preservation nozzle 152 is flush with the air outlet, so that the heat preservation nozzle 152 is embedded in the heat preservation section, which can protect the heat preservation nozzle 152 from being exposed to the high temperature atmosphere but is within the structure of the heat preservation section 130, thereby improving the service life of the nozzle. In this way, the distance between the air outlet end of the heat preservation nozzle 152 and the surface of the sintering trolley 30 is maximized, so that the heat preservation coverage is the widest, thereby achieving a better heat preservation effect.

[0032] In a preferred embodiment of the present invention, the outlet end of the heat-insulating nozzle 152 is shaped like a trumpet, narrow at the top and wide at the bottom.

[0033] It is worth noting that this expands the air outlet range, creating a curtain-like insulation effect. The narrow top and wide bottom design allows for slow diffusion, resulting in a more uniform insulation effect. At the same time, it reduces the number of insulation nozzles 152 required, thus lowering costs.

[0034] In a preferred embodiment of this utility model, the length of the heat preservation section 130 is greater than the length of the ignition section 120.

[0035] It is worth noting that the insulation section 130 is longer than the ignition section 120, which causes the sintering trolley 30 to travel a longer insulation path, thereby extending the insulation effect.

[0036] Furthermore, it also includes a flow monitoring system, which is connected to the preheating jet pipe 141 and the insulated jet pipe 151 for connecting to the hot steam pipe. The flow monitoring system includes a flow meter 210 and a flow control valve 220 arranged sequentially in the flow direction of the self-heating steam.

[0037] It should be noted that in the case of hot steam induction, if the steam injection rate is too low, the expected effect will not be achieved; if the injection rate is too high, the H2O content in the sintering flue gas will increase, which can easily lead to an overly wet layer and affect the sintering process. Therefore, a flow monitoring system is required to detect the hot steam flow rate in real time. The flow meter 210 is used to detect the real-time flow rate of the incoming hot steam, and then the flow control valve 220 is used to control the amount of hot steam flowing into the preheating jet pipe 141 and the heat preservation jet pipe 151 as needed. Preferably, both can be electrically connected to the PLC control system, so that the effect of automatic control can be achieved after the parameters are set. The specific connection and setting method is a well-known and mature technology, so it will not be described in detail.

[0038] Furthermore, the flow monitoring system also includes a shut-off valve 230, which is provided between the preheating jet pipe row 141, the heat preservation jet pipe row 151 and the flow control valve 220.

[0039] It should be understood that the shut-off valve 230 is used to cut off the incoming hot steam in an emergency to avoid the formation of an overly wet layer due to the inability to close the flow control valve 220 in an emergency, which would affect sintering. Therefore, the shut-off valve 230 is set as an emergency protection measure. Preferably, the amount of steam injected into the heat preservation section 130 is in the range of 13~30 kg / ton of sinter. The specific value can be set by those skilled in the art according to the actual situation.

[0040] Furthermore, the preheating assembly has two preheating units 140, and the insulation assembly has four insulation units 150.

[0041] It should be noted that the number of preheating units 140 can be set according to the desired preheating effect. There doesn't need to be too many; they only serve as auxiliary preheating units for the sintered ore mixture. However, more insulation units 150 can be set to increase the insulation coverage and ensure the insulation effect. Therefore, preferably, the number of preheating units 140 in the preheating assembly of this application is two, and the number of insulation units 150 in the insulation assembly is four. Those skilled in the art can set this as needed. It is worth mentioning that in other preferred embodiments, adjacent units (along the conveying direction of the sintering trolley 30) can also be arranged in a gradient or with an inclined angle. The gradient arrangement can adapt to changes in the temperature gradient of the material layer, improving the accuracy of preheating and insulation; the inclined angle arrangement can optimize the direction of steam action and improve penetration.

[0042] Furthermore, it also includes a protective cover, which is connected to the outside of the preheating section 110 to cover the space between the preheating section 110 and the sintering trolley 30.

[0043] It is understood that the protective cover (not shown in the figure) is used to improve the preheating effect of the preheating section 110, so that the sintered ore mixture can rise to the preheating temperature required for ignition more quickly, thereby improving the sintering efficiency; alternatively, protective covers can also be set on both sides of the heat preservation section 130 to similarly improve the heat preservation effect.

[0044] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A steam-coupled ignition and heat-preservation furnace, characterized in that, It includes a furnace body and preheating components, ignition components, and insulation components, all connected to the furnace body; wherein, The bottom of the furnace body has a conveying space for the sintering trolley to pass through. The furnace body includes a preheating section, an ignition section, and a heat preservation section arranged sequentially along the conveying direction of the sintering trolley. The preheating component is connected to the preheating section, the ignition component is connected to the ignition section, and the heat preservation component is connected to the heat preservation section. The air inlet end of the preheating component and the air inlet end of the heat preservation component are used to introduce hot steam with preheating temperature through pipes. The air outlet end of the preheating component, the ignition end of the ignition component, and the air outlet end of the heat preservation component are all arranged vertically at intervals above the sintering trolley and their openings face the sintering trolley. The heat preservation component is located at the end of the heat preservation section away from the ignition section.

2. The steam-coupled ignition and heat-preserving furnace according to claim 1, characterized in that, The preheating assembly includes multiple preheating units arranged side-by-side along the conveying direction of the sintering trolley, and the preheating section is a cantilever structure protruding outward from the ignition section; wherein... Each of the preheating units includes a preheating jet pipe array and multiple preheating nozzles spaced apart along the width direction of the sintering trolley. The preheating nozzles are connected to the cantilever structure. The preheating jet pipe array is connected to the top of the preheating nozzles and communicates with the interior of the multiple preheating nozzles. The air inlet of the preheating jet pipe array is used to receive hot steam with preheating temperature through a pipe. The air outlet of the preheating nozzles passes through the cantilever structure and opens towards the sintering trolley.

3. The steam-coupled ignition and heat-preserving furnace according to claim 2, characterized in that, The insulation component includes multiple insulation units arranged side-by-side along the conveying direction of the sintering trolley. Each insulation unit includes an insulation spray pipe array and multiple insulation nozzles spaced apart along the width direction of the sintering trolley. The insulation nozzles are internally connected to the insulation section of the furnace body. The insulation spray pipe array is connected to the top of the insulation nozzles and communicates with the interior of the multiple insulation nozzles. The air inlet of the insulation spray pipe array is used to access hot steam with a preheating temperature through a pipe. The bottom of the insulation section has an air outlet corresponding to each insulation nozzle. The air outlet of the insulation nozzle is flush with the air outlet.

4. The steam-coupled ignition and heat preservation furnace according to claim 3, characterized in that, The outlet end of the heat-insulating nozzle is shaped like a trumpet, narrow at the top and wide at the bottom.

5. The steam-coupled ignition and heat-preserving furnace according to claim 1, characterized in that, The length of the heat preservation section is greater than the length of the ignition section.

6. The steam-coupled ignition and heat-preserving furnace according to claim 3, characterized in that, It also includes a flow monitoring system, which is connected to the preheating jet pipe bank and the insulated jet pipe bank for connecting to hot steam. The flow monitoring system includes a flow meter and a flow control valve arranged sequentially in the flow direction of the self-heating steam.

7. The steam-coupled ignition and heat-preserving furnace according to claim 6, characterized in that, The flow monitoring system also includes a shut-off valve, which is installed between the preheating jet pipe bank, the heat-insulating jet pipe bank and the flow control valve.

8. The steam-coupled ignition and heat-preserving furnace according to claim 1, characterized in that, The preheating temperature of the hot steam is 150℃~320℃.

9. The steam-coupled ignition and heat-preserving furnace according to claim 3, characterized in that, The preheating assembly has two preheating units, and the insulation assembly has four insulation units.

10. The steam-coupled ignition and heat-preserving furnace according to claim 1, characterized in that, It also includes a protective cover, which is connected to the outside of the preheating section to cover the space between the preheating section and the sintering trolley.

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