Hot air furnace system

Abstract

The present invention discloses a hot blast furnace system, comprising: a hot blast furnace, the hot blast furnace having an air inlet and an exhaust gas outlet, the exhaust gas outlet being connected to a chimney through a flue pipe, and a grate being arranged in the hot blast furnace; an air supply pipe, one end of which is connected to the atmosphere and the other end is connected to the air inlet, and a combustion-supporting fan is connected in series on the air supply pipe; a reverse air supply pipe, one end of which is connected to the air supply pipe and is located between the combustion-supporting fan and the air inlet, and the other end of which is connected to the exhaust gas outlet, and a reverse air supply valve is arranged on the reverse air supply pipe, and the opening of the reverse air supply valve is adjustable. According to the hot blast furnace system of the present invention, the reverse air supply valve can be controlled to open so that air is blown into the hot blast furnace to cool the grate, so that the reverse air supply operation can be performed without additionally configuring a blower, and the grate temperature can be controlled within a normal temperature range by controlling the opening of the reverse air supply valve, thereby improving safety, simplifying the hot blast furnace system, and saving costs.

Description

Technical Field

[0001] The invention relates to the technical field of metallurgy, and in particular to a hot blast furnace system. Background Art

[0002] The hot blast furnace system in the related art has to stop the furnace baking once the grate temperature exceeds the allowable value during the hot blast furnace baking stage, and temporarily open a hole in the flue pipe to connect a blower to emergency cool the grate. After the furnace baking is completed, the temporary opening in the flue pipe is closed. The operation time is long and there are safety hazards. There are also defects such as large footprint and high cost. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a hot blast stove system, which can control the reverse air supply valve to open so that air is blown into the hot blast stove to cool the grate, so that the reverse air supply operation can be performed without additionally configuring a blower, and the grate temperature can be controlled within a normal temperature range by controlling the opening of the reverse air supply valve, thereby improving safety, simplifying the hot blast stove system, and saving costs.

[0004] According to an embodiment of the present invention, the hot blast stove system includes: a hot blast stove, the hot blast stove having an air inlet and an exhaust gas outlet, the exhaust gas outlet being connected to the chimney through a flue pipe, and a grate being provided in the hot blast stove; an air supply pipe, one end of which is connected to the atmosphere and the other end is connected to the air inlet, and a combustion-supporting fan is connected in series on the air supply pipe; a reverse air supply pipe, one end of which is connected to the air supply pipe and is located between the combustion-supporting fan and the air inlet, and the other end of which is connected to the exhaust gas outlet, and a reverse air supply valve is provided on the reverse air supply pipe, and the opening degree of the reverse air supply valve is adjustable.

[0005] According to the hot blast furnace system of the embodiment of the present invention, the reverse air supply valve can be controlled to open so that air is blown into the hot blast furnace to cool the grate, thereby performing reverse air supply operation without additionally configuring a blower. At the same time, the grate temperature can be controlled within a normal temperature range by controlling the opening of the reverse air supply valve, thereby improving safety, simplifying the hot blast furnace system, and saving costs.

[0006] In some embodiments of the present invention, an air discharge valve is provided on the air supply pipeline, one end of the reverse air supply pipeline is located between the air discharge valve and the combustion-supporting fan, and the air discharge valve is used to control whether the gas in the air supply pipeline is discharged into the atmosphere.

[0007] In some embodiments of the present invention, a fan outlet control valve is connected in series to the air supply pipeline, and the fan outlet control valve is located between one end of the reverse air supply pipeline and the air discharge valve, and the opening of the fan outlet control valve is adjustable.

[0008] In some embodiments of the present invention, a fan inlet regulating valve is connected in series on the air supply pipeline, and the fan inlet regulating valve is located at the air inlet end of the combustion-supporting fan to control the air inlet volume flowing into the combustion-supporting fan.

[0009] In some embodiments of the present invention, the flue pipeline includes a main flue pipeline and two branch flue pipelines, one end of the two branch flue pipelines is respectively connected to the exhaust gas outlet and the other end is respectively connected to the main flue pipeline, and a flue branch pipe control valve is provided on the flue branch pipe, and the opening of the flue branch pipe control valve is adjustable.

[0010] In some embodiments of the present invention, the other end of the reverse air supply pipeline is connected to the exhaust gas outlet through one of the flue branch pipelines, and the other end of the reverse air supply pipeline is located between the exhaust gas outlet and the flue branch pipe control valve.

[0011] In some embodiments of the present invention, it includes: an induced draft duct, one end of which is connected to the air supply duct and is located at the air inlet end of the combustion-supporting fan, the other end of which is connected to the exhaust gas outlet, and an induced draft valve is connected in series on the induced draft duct, and the opening of the induced draft valve is adjustable.

[0012] In some embodiments of the present invention, the hot air furnace system also includes an air duct pipeline, the reverse air supply pipeline and the induced air pipeline are connected in parallel at one end of the air duct pipeline, the other end of the air duct pipeline is connected to the exhaust gas outlet, and an air duct branch control valve is provided on the air duct pipeline, and the opening of the air duct branch control valve is adjustable.

[0013] In some embodiments of the present invention, the air duct pipeline includes an air duct main pipeline and an air duct branch pipeline, there are multiple hot air furnaces, there are multiple air duct branch pipelines, one end of the multiple air duct branch pipelines is connected to the multiple hot air furnaces one-to-one, and the other ends of the multiple air duct branch pipelines are respectively connected to the air duct main pipeline.

[0014] In some embodiments of the present invention, one end of the air supply pipeline is connected to the atmosphere through a muffler.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0017] Figure 1 Schematic diagram of the structure of a hot blast stove system according to an embodiment of the present invention.

[0018] Reference numerals:

[0019] Hot air furnace system 100;

[0020] Hot air furnace 1; air inlet 11; exhaust gas outlet 12;

[0021] Air supply pipeline 2; combustion-supporting fan 21; fan inlet regulating valve 22; fan outlet control valve 23; air discharge valve 24; combustion-supporting control main pipe 25; combustion-supporting control branch pipe 251; air bypass valve 26; air release pipe 27; air branch pipe regulating valve 28; air branch pipe cut-off valve 29;

[0022] Reverse air supply pipeline 3; reverse air supply valve 31;

[0023] Air induced pipe 4; air duct pipe 41; air duct main pipe 42; air duct branch pipe 421; air duct branch pipe control valve 43; air induced valve 44;

[0024] Combustion air pipeline 5;

[0025] Heat exchanger 6; heat exchanger inlet valve 61; heat exchanger outlet valve 62;

[0026] Flue pipe 7; flue main pipe 71; flue branch pipe 711; flue branch pipe control valve 72; chimney 73;

[0027] Silencer 8. DETAILED DESCRIPTION

[0028] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0029] Reference below Figure 1 A hot blast stove system 100 according to an embodiment of the present invention is described.

[0030] According to the hot blast stove system 100 of the embodiment of the present invention, refer to Figure 1 As shown, it may include a hot air stove 1 , an air supply pipeline 2 , a reverse air supply pipeline 3 , a reverse air supply valve 31 , an air discharge valve 24 and an induced air pipeline 4 .

[0031] Reference Figure 1As shown, the hot blast furnace 1 has an air inlet 11 and an exhaust gas outlet 12. The exhaust gas outlet 12 is connected to the chimney 73 through the flue pipe 7. A grate is provided in the hot blast furnace 1. One end of the air supply pipe 2 is connected to the atmosphere, and the other end is connected to the air inlet 11. A combustion-supporting fan 21 is connected in series on the air supply pipe 2. The combustion-supporting fan 21 is used to provide combustion-supporting air to the hot blast furnace 1.

[0032] Reference Figure 1 As shown, one end of the reverse air supply pipeline 3 is connected to the air supply pipeline 2 and is located between the combustion-supporting fan 21 and the air inlet 11, and the other end of the reverse air supply pipeline 3 is connected to the exhaust gas outlet 12. A reverse air supply valve 31 is provided on the reverse air supply pipeline 3, and the opening of the reverse air supply valve 31 is adjustable. The hot blast furnace system 100 can be operated with reverse air supply. Specifically, in the reverse air supply operation, the combustion-supporting fan 21 is turned on, and the reverse air supply valve 31 is opened. Under the drive of the combustion-supporting fan 21, the outside air flows into the air supply pipeline 2 through one end of the air supply pipeline 2, and then flows to the exhaust gas outlet 12 through the reverse air supply pipeline 3, so that the air is blown into the hot blast furnace 1 to cool the grate, so that the reverse air supply operation can be performed without additionally configuring a blower. At the same time, the grate temperature can be controlled within the normal temperature range by controlling the opening of the reverse air supply valve 31, thereby improving safety, simplifying the hot blast furnace system 100, and saving costs.

[0033] In view of this, according to the hot blast furnace system 100 of the embodiment of the present invention, the reverse air supply valve 31 can be controlled to open so that air is blown into the hot blast furnace 1 to cool the grate, thereby performing reverse air supply operation without additionally configuring a blower. At the same time, by controlling the opening of the reverse air supply valve 31, the grate temperature can be controlled within a normal temperature range, thereby improving safety, simplifying the hot blast furnace system 100, and saving costs.

[0034] In some embodiments of the present invention, reference Figure 1As shown, an air discharge valve 24 is provided on the air supply pipeline 2, and one end of the reverse air supply pipeline 3 is located between the air discharge valve 24 and the combustion-supporting fan 21. The air discharge valve 24 is used to control whether the gas in the air supply pipeline 2 is discharged to the atmosphere. Among them, the hot blast furnace system 100 can be operated to quickly cool down the furnace. Under the rapid cooling down operation, the combustion-supporting fan 21 is turned on, the reverse air supply valve 31 is turned on, and the air discharge valve 24 is turned on. Driven by the combustion-supporting fan 21, the outside air flows into the air supply pipe 2 through one end of the air supply pipe 2, and then flows to the intersection of the reverse air supply pipe 3 and the air supply pipe 2, and forms a negative pressure at the intersection, so that the high-temperature gas in the hot blast furnace 1 is drawn to the air discharge valve 24, and finally the air discharge valve 24 is discharged to the atmosphere to quickly reduce the temperature in the hot blast furnace 1, so that when the hot blast furnace 1 ends its life and needs maintenance, the hot blast furnace 1 can be quickly cooled down to save overhaul time, and the cold air introduced by the combustion-supporting fan 21 can be mixed with the high-temperature gas to cool down the high-temperature gas, which can prevent the air supply pipe 2 and the air discharge valve 24 from being damaged by high temperature.

[0035] It should be noted that in the related art, during overhaul of a hot blast furnace, the furnace can only be cooled down through temporary pipelines or natural ventilation, which prolongs the maintenance time. However, according to the hot blast furnace system 100 of the embodiment of the present invention, the combustion-supporting fan 21 can be used to quickly cool down the hot blast furnace system 100, thereby avoiding cooling down through temporary pipelines or natural ventilation. The cooling down operation is efficient and low-cost.

[0036] In some optional embodiments of the present invention, referring to Figure 1 As shown, a fan outlet control valve 23 is connected in series on the air supply pipeline 2, and the fan outlet control valve 23 is located between one end of the reverse air supply pipeline 3 and the air discharge valve 24, and the opening of the fan outlet control valve 23 is adjustable. It can be understood that when the hot blast furnace 1 is blown, when the opening of the fan outlet control valve 23 is increased, the air volume of the combustion-supporting air entering the hot blast furnace 1 can be increased, thereby enhancing the combustion-supporting effect on the hot blast furnace 1 and increasing the temperature of the hot blast furnace 1; when the opening of the fan outlet control valve 23 is reduced, the air volume entering the hot blast furnace 1 can be reduced, thereby reducing the temperature in the hot blast furnace 1. Therefore, by setting the fan outlet control valve 23, it is beneficial to control the temperature in the hot blast furnace 1 within a safe range.

[0037] In some embodiments of the present invention, reference Figure 1As shown, a fan inlet regulating valve 22 is connected in series on the air supply pipeline 2, and the fan inlet regulating valve 22 is located at the air inlet end of the combustion-supporting fan 21 to control the air inlet amount flowing into the combustion-supporting fan 21. It can be understood that when the hot blast furnace 1 is blown, when the opening of the fan inlet regulating valve 22 is increased, the air volume of the combustion-supporting air entering the hot blast furnace 1 can be increased, thereby enhancing the combustion-supporting effect on the hot blast furnace 1 and increasing the temperature of the hot blast furnace 1; when the opening of the fan inlet regulating valve 22 is reduced, the air volume entering the hot blast furnace 1 can be reduced, thereby reducing the temperature in the hot blast furnace 1. Therefore, by setting the fan inlet regulating valve 22, it is beneficial to control the temperature in the hot blast furnace 1 within a safe range.

[0038] In some embodiments of the present invention, reference Figure 1 As shown, the flue pipe 7 includes a flue main pipe 71 and two flue branch pipes 711, one end of the two flue branch pipes 711 is respectively connected to the exhaust gas outlet 12 and the other end is respectively connected to the flue main pipe 71, and a flue branch pipe control valve 72 is provided on the flue branch pipe 711, and the opening of the flue branch pipe control valve 72 is adjustable. It can be understood that by providing two flue branch pipes 711, and each flue branch pipe 711 is provided with a flue branch pipe control valve 72, the exhaust gas emission of the hot blast stove 1 can be controlled by controlling the opening of the two flue branch pipe control valves 72, so as to ensure the reliable exhaust of the hot blast stove 1.

[0039] In some optional embodiments of the present invention, referring to Figure 1 As shown, the other end of the reverse air supply pipeline 3 is connected to the exhaust gas outlet 12 through one of the flue branch pipelines 711, and the other end of the reverse air supply pipeline 3 is located between the exhaust gas outlet 12 and the flue branch pipe control valve 72. Therefore, during the reverse air supply operation, the combustion-supporting fan 21 can be controlled to open, the reverse air supply valve 31 can be controlled to open, and the flue branch pipe control valve 72 on the flue branch pipeline 711 connected to the reverse air supply pipeline 3 can be controlled to close, so as to ensure that in the reverse air supply operation, all the cold air flowing out of the reverse air supply pipeline 3 flows into the hot blast furnace 1, which is beneficial to improving the cooling efficiency of the hot blast furnace 1.

[0040] For example, in the reverse air supply operation, the flue branch pipe control valve 72 on the flue branch pipe 711 connected to the reverse air supply pipe 3 can be controlled to be closed, and the flue branch pipe control valve 72 on the other flue branch pipe 711 can be controlled to be opened. Therefore, in the reverse air supply operation, after the gas flowing out of the reverse air supply pipe 3 cools the grate at the bottom of the hot blast furnace 1, it can flow to the chimney 73 through the other flue branch pipe 711, thereby realizing the exhaust gas discharge in the reverse air supply operation.

[0041] In some optional embodiments of the present invention, referring to Figure 1As shown, one end of the induced air duct 4 is connected to the air supply duct 2 and is located at the air inlet end of the combustion-supporting fan 21, and the other end of the induced air duct 4 is connected to the exhaust gas outlet 12. An induced air valve 44 is connected in series on the induced air duct 4, and the opening of the induced air valve 44 is adjustable. Among them, the hot blast furnace system 100 can be operated with induced draft. Under the induced draft operation, the combustion-supporting fan 21 is opened, the reverse air valve 31 is closed, the induced draft valve 44 is opened, and the air discharge valve 24 is opened. Driven by the combustion-supporting fan 21, the high-temperature gas in the hot blast furnace 1 flows to the air inlet end of the combustion-supporting fan 21 through the induced draft pipeline 4, and then flows to the air discharge valve 24 through the air outlet end of the combustion-supporting fan 21, and finally is discharged to the atmosphere through the air discharge valve 24, thereby forming a negative pressure in the hot blast furnace 1, and then only ambient air can flow into the hot blast furnace 1. When the hot blast furnace 1 needs to overhaul the air valve, it can effectively prevent the high-temperature gas in the hot blast furnace 1 from overflowing and causing harm to the maintenance personnel. In addition, the opening of the induced draft valve 44 is adjustable. By adjusting the opening of the induced draft valve 44, it is helpful to avoid excessively high or low pressure in the hot blast furnace 1, which is helpful to reduce safety hazards.

[0042] It should be noted that, in the related art, if the hot air valve of the hot air stove system needs to be replaced urgently, in order to prevent the safety hazard of hot air overflow to the operators, an external fan can only be used to blow air on the outside or extend the maintenance time. However, according to the hot air stove system 100 of the embodiment of the present invention, by induced draft operation of the hot air stove system 100, the combustion-supporting fan 21 can be used to form a negative pressure in the hot air stove 1, and only ambient air can flow into the hot air stove 1. When the air valve of the hot air stove 1 needs to be repaired, the high-temperature gas in the hot air stove 1 can be effectively prevented from overflowing and causing harm to the maintenance personnel, thereby avoiding the use of an external fan to blow air on the outside or extending the maintenance time, which can reduce maintenance costs and help reduce maintenance time.

[0043] Further, refer to Figure 1 As shown, a fan inlet regulating valve 22 is connected in series on the air supply pipeline 2, and the fan inlet regulating valve 22 is located at the air inlet end of the combustion-supporting fan 21 to control the air inlet amount flowing into the combustion-supporting fan 21. It can be understood that under the induced draft operation, the high-temperature gas can easily cause damage to the combustion-supporting fan 21. By controlling the fan inlet regulating valve 22 to open, the cold air in the atmosphere can be mixed with the high-temperature gas flowing out of the hot blast furnace 1 at the air inlet end of the combustion-supporting fan 21, thereby reducing the temperature of the gas flowing to the combustion-supporting fan 21, which is beneficial to avoiding the temperature of the combustion-supporting fan 21 from being too high, and by controlling the opening of the fan inlet regulating valve 22, the air volume of the cold air introduced into the atmosphere can be controlled, which is beneficial to ensuring that the combustion-supporting fan 21 operates within a suitable temperature range.

[0044] In some optional embodiments of the present invention, referring to Figure 1As shown, the hot blast furnace system 100 further includes an air duct pipeline 41, the reverse air supply pipeline 3 and the induced air pipeline 4 are connected in parallel to one end of the air duct pipeline 41, the other end of the air duct pipeline 41 is connected to the exhaust gas outlet 12, and an air duct branch pipe control valve 43 is provided on the air duct pipeline 41, and the opening of the air duct branch pipe control valve 43 is adjustable. It can be understood that by connecting the reverse air supply pipeline 3 and the induced air pipeline 4 in parallel to the inlet end of the air duct main pipeline 42, and providing the air duct branch pipe control valve 43 on the air duct pipeline 41, and the air duct branch pipe control valve 43 is used in conjunction with the reverse air supply valve 31 and the induced air valve 44, respectively, the structure of the hot blast furnace system 100 can be simplified, which is conducive to further saving the floor space and manufacturing cost of the hot blast furnace system 100.

[0045] In some optional embodiments of the present invention, referring to Figure 1 As shown, the air duct pipeline 41 includes an air duct main pipeline 42 and an air duct branch pipeline 421, there are multiple hot blast furnaces 1, there are multiple air duct branch pipelines 421, one end of the multiple air duct branch pipelines 421 is connected to the multiple hot blast furnaces 1 in a one-to-one correspondence, and the other ends of the multiple air duct branch pipelines 421 are respectively connected to the air duct main pipeline 42. It can be understood that by arranging multiple hot blast furnaces 1 to be connected to one end of multiple air duct branch pipelines 421 in a one-to-one correspondence, the multiple hot blast furnaces 1 can be respectively operated for reverse air supply and air induction, which is conducive to ensuring the reliable operation of each hot blast furnace 1 and facilitating the maintenance of the hot blast furnace 1. At the same time, by making the hot blast furnace system 100 include multiple hot blast furnaces 1, it is conducive to improving the energy efficiency of the hot blast furnace system 100 and reducing costs.

[0046] Optionally, there are multiple air duct branch pipes 421 and flue branch pipe control valves 72. During induced draft operation, both flue branch pipe control valves 72 are closed to prevent dust in the chimney 73 from being introduced into the pipes and the hot blast furnace 1 during induced draft, thereby ensuring the reliable operation of the hot blast furnace 1.

[0047] In some optional embodiments of the present invention, referring to Figure 1 As shown, one end of the air supply pipe 2 is connected to the atmosphere through a muffler 8. It is understandable that when the air from the atmosphere enters the pipe of the hot air stove system 100, friction will be generated and noise will be generated. By providing a muffler 8 at the end connected to the atmosphere, it is helpful to reduce noise pollution.

[0048] The hot blast stove system 100 according to a specific embodiment of the present invention is described below with reference to the drawings. It is worth noting that the following description is only exemplary and intended to be used to explain the present invention, and cannot be construed as limiting the present invention.

[0049] Reference Figure 1As shown, the hot blast furnace system 100 according to an embodiment of the present invention may include a hot blast furnace 1, an air supply pipeline 2, a reverse air supply pipeline 3, a reverse air supply valve 31, an air discharge valve 24, an induced air pipeline 4, a combustion-supporting air pipeline 5, a heat exchanger 6, a combustion-supporting control main pipe 25, a combustion-supporting control branch pipe 251, an air bypass valve 26, an air duct main pipeline 42, an air duct branch pipeline 421, a heat exchanger inlet valve 61 and a heat exchanger outlet valve 62.

[0050] There are multiple hot blast furnaces 1, each of which has an air inlet 11 and an exhaust gas outlet 12. The exhaust gas outlet 12 is connected to the chimney 73 through a flue pipe 7. A grate is provided in the hot blast furnace 1. Specifically, each flue pipe 7 includes a main flue pipe 71 and two flue branch pipes 711. One end of the two flue branch pipes 711 is respectively connected to the exhaust gas outlet 12 and the other end is respectively connected to the main flue pipe 71. A flue branch pipe control valve 72 is provided on the flue branch pipe 711, and the opening of the flue branch pipe control valve 72 is adjustable.

[0051] The air inlet 11 of the hot blast furnace 1 is connected to the heat exchanger outlet valve 62 of the heat exchanger 6 through the combustion-supporting control main pipe 25 and the combustion-supporting control branch pipe 251. The combustion-supporting control branch pipe 251 is provided with an air branch pipe regulating valve 28 and an air branch pipe shut-off valve 29.

[0052] One end of the combustion-supporting air pipeline 5 is connected to the atmosphere and the other end is connected to the heat exchanger inlet valve 61 of the heat exchanger 6, one end of the air supply pipeline 2 is connected to the atmosphere and the other end is connected to the heat exchanger outlet valve 62 of the heat exchanger 6, and the air bypass valve 26 is connected between the combustion-supporting air pipeline 5 and the air supply pipeline 2 to connect or cut off the combustion-supporting air pipeline 5 and the air supply pipeline 2. Further, the combustion-supporting air pipeline 5 is also provided with a muffler 8, a combustion-supporting fan 21, a fan outlet control valve 23 and an air discharging pipe 27.

[0053] The air supply pipeline 2 is provided with a silencer 8, a combustion-supporting fan 21, a fan outlet control valve 23 and an air discharge valve 24. One end of the reverse air supply pipeline 3 is connected with the air supply pipeline 2 and is located at the air outlet end of the combustion-supporting fan 21. One end of the induced air pipeline 4 is connected with the air supply pipeline 2 and is located at the air inlet end of the combustion-supporting fan 21. The other end of the reverse air supply pipeline 3 and the other end of the induced air pipeline 4 are connected in parallel to one end of the air duct main pipeline 42. The reverse air supply pipeline 3 is provided with a reverse air supply valve 31, and the induced air pipeline 4 is provided with an induced air valve 44.

[0054] The main air duct line 42 is connected to the exhaust gas outlet 12 of the corresponding hot blast furnace 1 through the corresponding branch air duct line 421 , and the branch air duct line 421 is provided with a branch air duct control valve 43 .

[0055] Specifically, the hot blast furnace system 100 can be operated with a blast. Under the blast operation, the combustion-supporting fan 21 is turned on, the fan inlet regulating valve 22 is turned on, the fan outlet control valve 23 is turned on, and the air bypass valve 26 is turned on. The outside air passes through the muffler 8, the fan inlet regulating valve 22, the combustion-supporting fan 21, the fan outlet control valve 23, the air bypass valve 26, the heat exchanger inlet valve 61, the heat exchanger 6, the heat exchanger outlet valve 62, the air branch regulating valve 28, and the air branch shut-off valve 29 into the hot blast furnace 1. The combustion-supporting air has a combustion-supporting effect on the hot blast furnace 1, and the opening of the fan inlet regulating valve 22 is adjustable, so that the air intake of the hot blast furnace 1 can be more accurately controlled, and thus the temperature in the hot blast furnace 1 can be more accurately controlled.

[0056] The hot blast furnace system 100 can be operated with reverse air supply. In the reverse air supply operation, the combustion-supporting fan 21 is turned on, the reverse air supply valve 31 is opened, the induced draft valve 44 is closed, and the air duct branch pipe control valve 43 is opened. External cold air passes through the muffler 8, the fan inlet regulating valve 22, the combustion-supporting fan 21, the reverse air supply valve 31, and the air duct branch pipe control valve 43 and enters the hot blast furnace 1, thereby blowing air into the hot blast furnace 1 to cool the grate. In this way, reverse air supply operation can be performed without additionally configuring a blower. At the same time, the grate temperature can be controlled within a normal temperature range by controlling the opening of the reverse air supply valve 31, thereby improving safety and simplifying the hot blast furnace system 100, thereby saving costs.

[0057] The hot blast furnace system 100 can be subjected to a rapid cooling operation. In the rapid cooling operation, the combustion-supporting fan 21 is opened, the reverse air supply valve 31 is opened, the air discharge valve 24 is opened, the draft valve 44 is closed, and the air duct branch pipe control valve 43 is opened. The high-temperature gas in the hot blast furnace 1 flows through the air duct branch pipe control valve 43, the reverse air supply valve 31, the fan outlet control valve 23, and the air discharge valve 24 into the external environment. Therefore, when the hot blast furnace 1 is repaired at the end of its generation life, the hot blast furnace 1 can be cooled quickly to save overhaul time. In addition, the cold air introduced by the combustion-supporting fan 21 can be mixed with the high-temperature gas to cool the high-temperature gas, thereby preventing the air supply pipeline 2 and the air discharge valve 24 from being damaged by high temperature.

[0058] The hot blast furnace system 100 can be operated with induced draft. Under the induced draft operation, the combustion-supporting fan 21 is opened, the reverse air supply valve 31 is closed, the induced draft valve 44 is opened, the air discharge valve 24 is opened, and the air duct branch pipe control valve 43 is opened. The high-temperature gas in the hot blast furnace 1 enters the atmosphere through the air duct branch pipe control valve 43, the induced draft valve 44, the combustion-supporting fan 21, the fan outlet control valve 23, and the air discharge valve 24. When the hot blast furnace 1 needs to overhaul the air valve, it can effectively prevent the high-temperature gas in the hot blast furnace 1 from overflowing and causing harm to the maintenance personnel. In addition, the opening of the induced draft valve 44 is adjustable. By adjusting the opening of the induced draft valve 44, it is helpful to avoid excessively high or low pressure in the hot blast furnace 1, thereby reducing safety hazards.

[0059] Other structures and operations of the hot blast stove system 100 according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0060] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0061] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0062] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A hot air stove system, characterized in that: include: A hot blast furnace, wherein the hot blast furnace has an air inlet and an exhaust gas outlet, the exhaust gas outlet is connected to the chimney through a flue pipe, and a grate is provided in the hot blast furnace; An air supply pipeline, one end of which is connected to the atmosphere and the other end of which is connected to the air inlet, and a combustion-supporting blower is connected in series to the air supply pipeline; A reverse air supply pipeline, one end of which is connected to the air supply pipeline and is located between the combustion-supporting fan and the air inlet, and the other end of which is connected to the exhaust gas outlet. A reverse air supply valve is provided on the reverse air supply pipeline, and the opening of the reverse air supply valve is adjustable; An air discharge valve is provided on the air supply pipeline, one end of the reverse air supply pipeline is located between the air discharge valve and the combustion-supporting fan, and the air discharge valve is used to control whether the gas in the air supply pipeline is discharged to the atmosphere; An induced air pipeline, one end of which is connected to the air supply pipeline and is located at the air inlet end of the combustion-supporting fan, the other end of which is connected to the exhaust gas outlet, and an induced air valve is connected in series on the induced air pipeline, and the opening of the induced air valve is adjustable; An air duct pipeline, wherein the reverse air supply pipeline and the induced air pipeline are connected in parallel to one end of the air duct pipeline, the other end of the air duct pipeline is connected to the exhaust gas outlet, and an air duct branch pipe control valve is provided on the air duct pipeline, and the opening degree of the air duct branch pipe control valve is adjustable; A fan inlet regulating valve is connected in series on the air supply pipeline, and the fan inlet regulating valve is located at the air inlet end of the combustion-supporting fan to control the air inlet volume flowing into the combustion-supporting fan.

2. The hot blast stove system according to claim 1, characterized in that: A fan outlet control valve is connected in series on the air supply pipeline. The fan outlet control valve is located between one end of the reverse air supply pipeline and the air discharge valve. The opening of the fan outlet control valve is adjustable.

3. The hot blast stove system according to claim 1, characterized in that: The flue pipeline includes a main flue pipeline and two branch flue pipelines, one end of the two branch flue pipelines is respectively connected to the exhaust gas outlet and the other end is respectively connected to the main flue pipeline, and a flue branch pipe control valve is provided on the flue branch pipe, and the opening of the flue branch pipe control valve is adjustable.

4. The hot blast stove system according to claim 3, characterized in that: The other end of the reverse air supply pipeline is connected to the exhaust gas outlet through one of the flue branch pipelines, and the other end of the reverse air supply pipeline is located between the exhaust gas outlet and the flue branch pipe control valve.

5. The hot blast stove system according to claim 1, characterized in that: The air duct pipeline includes an air duct main pipeline and an air duct branch pipeline. There are multiple hot air furnaces and multiple air duct branch pipelines. One end of the multiple air duct branch pipelines is connected to the multiple hot air furnaces one by one, and the other ends of the multiple air duct branch pipelines are respectively connected to the air duct main pipeline.

6. The hot blast stove system according to any one of claims 1 to 5, characterized in that: One end of the air supply pipeline is connected to the atmosphere through a muffler.

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