A hot blast stove system for blast furnaces

Abstract

The present application relates to a kind of hot blast stove systems for blast furnace, applied in the technical field of steel blast furnace, including hot blast stove group I, hot blast stove group II and hot blast stove, respectively with auxiliary hot blast stove connection's coal gas pipeline, air pipe, hot blast pipe, air inlet pipe, flue gas pipeline are three-pronged pipeline, another two pipes in hot blast pipe are connected with blast furnace I, blast furnace II respectively, and two pipes are respectively provided with hot blast valve, diffusion valve, pressure control component is set on the pipe between hot blast valve and diffusion valve, the valve plate in the hot blast valve on two pipes is mirror image setting;Air control valve I is set on the pipe in air inlet pipe and the auxiliary hot blast stove connection, air control valve II is respectively set on another two pipes in the air inlet pipe;With auxiliary hot blast stove as standby furnace is put into use, realize that each blast furnace is still matched with three hot blast stoves, ensure that blast furnace hot blast temperature is not influenced by hot blast stove maintenance, improve production efficiency, reduce the effect of cost.

Description

Technical Field

[0001] This invention is applied in the field of blast furnace technology, and in particular relates to a hot blast stove system for blast furnaces. Background Technology

[0002] The existing patent publication number "CN1033202561A" discloses a hot blast stove system and method for achieving high blast temperature by burning pure blast furnace gas. It includes: a hot blast stove, a blast furnace gas pipeline, a combustion air pipeline, a hot blast pipeline, and a flue gas pipeline; the hot blast stove is connected to the blast furnace gas pipeline, the combustion air pipeline, the hot blast pipeline, and the flue gas pipeline respectively; the hot blast stove system also includes a heat exchange system for exchanging heat between the 30°C combustion air blown out by an external combustion fan, the 80°C blast furnace gas supplied from the external blast furnace gas pipeline, and the flue gas discharged from the hot blast stove. The heat exchange system is connected to the hot blast stove through the blast furnace gas pipeline, the combustion air pipeline, and the flue gas pipeline respectively.

[0003] The above description has the following problems: When supplying hot blast to a blast furnace, each blast furnace corresponds to a hot blast stove system. When one of the hot blast stoves in the system fails, the entire equipment needs to be shut down for repair. The repair is complicated, time-consuming, labor-intensive, reduces production efficiency, and increases costs. Summary of the Invention

[0004] The purpose of this invention is to provide a hot blast stove system for blast furnaces, which solves the problem that when one of the hot blast stoves in the existing system fails, the entire equipment needs to be shut down for repair, which is complex, time-consuming, labor-intensive, reduces production efficiency, and increases costs.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] This invention provides a hot blast stove system for a blast furnace. The blast furnace includes blast furnace I and blast furnace II. The hot blast stove system includes hot blast stove group I and hot blast stove group II. The hot blast stove system further includes:

[0007] An auxiliary hot blast stove, which cooperates with the hot blast stove group I to supply hot blast into the blast furnace I, or the auxiliary hot blast stove cooperates with the hot blast stove group II to supply hot blast into the blast furnace II;

[0008] Gas pipes, air pipes, hot air pipes, air inlet pipes, and flue gas pipes are respectively connected to the auxiliary hot air furnace. The hot air pipes and air inlet pipes are all three-way pipes, and one of the pipes in each three-way pipe is connected to the auxiliary hot air furnace.

[0009] Two other pipes in the hot air duct are respectively connected to blast furnace I and blast furnace II, and a hot air valve and a vent valve are respectively provided on the two other pipes in the hot air duct. A pressure control component is provided on the pipe located between the hot air valve and the vent valve. The valve plates of the hot air valves on the two pipes are mirror images of each other.

[0010] The other two pipes in the air inlet duct are respectively connected to the main air inlet pipes of the hot blast furnace group I and the hot blast furnace group II. An air control valve I is installed on the pipe in the air inlet duct that is connected to the auxiliary hot blast furnace. An air control valve II is installed on the other two pipes in the air inlet duct. The pressure control component includes a pressure control pipe and a pressure control valve installed on the pressure control pipe.

[0011] Furthermore, each of the hot air ducts is equipped with a corrugated pipe.

[0012] Furthermore, the hot air valve and the vent valve are also equipped with cooling components for cooling them.

[0013] Furthermore, it also includes a pressure stabilizing component, which includes a pressure stabilizing pipe and a pressure stabilizing valve disposed on the pressure stabilizing pipe. The two ends of the pressure stabilizing pipe are respectively connected to one of the pipes in the air inlet pipe and are located on the upper and lower sides of the air control valve I.

[0014] Furthermore, the number of air control valves II on two other pipes in the air inlet duct is two, and an exhaust duct is provided between the two air control valves II, and an exhaust valve is provided on the exhaust duct.

[0015] Furthermore, the gas pipeline, the flue gas pipeline, and the air pipeline are also three-way pipelines. One of the pipelines in each three-way pipeline is connected to the auxiliary hot blast stove. The other two pipelines in the gas pipeline are respectively connected to the main gas pipeline in the hot blast stove group I and the hot blast stove group II. The other two pipelines in the air pipeline are respectively connected to the main combustion air pipeline in the hot blast stove group I and the hot blast stove group II. The other two pipelines in the flue gas pipeline are respectively connected to the main exhaust pipe in the hot blast stove group I and the hot blast stove group II.

[0016] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0017] This invention provides a hot blast stove system for a blast furnace, comprising a hot blast stove group I, a hot blast stove group II, and an auxiliary hot blast stove. The auxiliary hot blast stove works in conjunction with hot blast stove group I to supply hot blast to blast furnace I, or works in conjunction with hot blast stove group II to supply hot blast to blast furnace II. Gas pipes, air pipes, hot blast pipes, air inlet pipes, and flue gas pipes are respectively connected to the auxiliary hot blast stoves. The hot blast pipes and air inlet pipes are all three-way pipes, with one pipe in each three-way pipe connected to the auxiliary hot blast stove. The other two pipes in the hot blast pipes are respectively connected to blast furnace I and blast furnace II. By setting up auxiliary hot blast stoves, when one of the hot blast stoves in hot blast stove group I or hot blast stove group II malfunctions and needs maintenance, the auxiliary hot blast stove is put into use as a backup stove, ensuring that each blast furnace still has three hot blast stoves, thus ensuring that the blast furnace hot blast temperature is not affected by hot blast stove maintenance.

[0018] Two other pipes in the hot blast duct are respectively equipped with a hot blast valve and a vent valve. A pressure control device is installed on the pipe located between the hot blast valve and the vent valve. The valve plates of the hot blast valves on the two pipes are mirror images of each other. Two other pipes in the air inlet duct are respectively connected to the main air inlet pipes of the hot blast stove group I and the hot blast stove group II. An air control valve I is installed on the pipe in the air inlet duct connected to the auxiliary hot blast stove. An air control valve II is installed on the other two pipes in the air inlet duct. When hot blast is supplied to the blast furnace, the pressure in the pipe is adjusted by the pressure control device. Under the action of pressure difference, the hot blast valve is sealed more tightly, and no air leakage occurs. Attached Figure Description

[0019] The following sections will describe some specific embodiments of the invention in detail by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or portions. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0020] Figure 1 This is a schematic diagram of the overall structure in a preferred embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the auxiliary hot air furnace in a preferred embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the gas pipeline and air pipeline in a preferred embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the flue gas duct in a preferred embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of the hot air duct structure in a preferred embodiment of the present invention;

[0025] Figure 6 This is a schematic diagram of the air inlet duct in a preferred embodiment of the present invention.

[0026] The reference numerals in the attached figures are explained as follows:

[0027] 1. Blast Furnace I; 2. Blast Furnace II; 3. Hot Blast Stove Group I; 4. Hot Blast Stove Group II; 5. Auxiliary Hot Blast Stove; 6. Gas Pipeline; 7. Air Pipeline; 8. Hot Blast Pipeline; 9. Air Inlet Pipeline; 10. Flue Gas Pipeline; 11. Butterfly Valve; 13. Switch Valve; 14. Air Control Valve I; 15. Air Control Valve II; 16. Hot Blast Valve; 17. Vent Valve; 18. Pressure Control Components; 181. Pressure Control Pipe; 182. Pressure Control Valve; 19. Exhaust Pipeline; 20. Exhaust Valve; 22. Corrugated Pipe. Detailed Implementation

[0028] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., 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 the invention and for 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 the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0031] refer to Figure 1 This invention provides a hot blast stove system for a blast furnace. The blast furnace includes blast furnace I1 and blast furnace II2, and the hot blast stove system includes hot blast stove group I3 and hot blast stove group II4. Both hot blast stove group I3 and hot blast stove group II4 include three hot blast stoves. The three hot blast stoves in hot blast stove group I3 and hot blast stove group II4 adopt a "two-burn-one-send" mode. When all three hot blast stoves in hot blast stove group I3 and hot blast stove group II4 are working normally without any faults, hot blast is supplied to the corresponding blast furnace I1 and blast furnace II2 through hot blast stove group I3 and hot blast stove group II4 respectively.

[0032] Further, refer to Figure 1 and Figure 2The hot blast stove system also includes an auxiliary hot blast stove 5, which is a Kalugin top-fired hot blast stove. When a hot blast stove in hot blast stove group I3 or hot blast stove group II4 has a problem and needs to be repaired, the auxiliary hot blast stove 5 is put into use as a backup stove. Therefore, by setting up the auxiliary hot blast stove 5, each blast furnace can still be equipped with three hot blast stoves to ensure that hot blast can be continuously delivered into the blast furnace.

[0033] refer to Figure 1 and Figure 2 The hot blast stove system also includes a gas pipe 6, an air pipe 7, a hot air pipe 8, an air inlet pipe 9, and a flue gas pipe 10, which are respectively connected to the auxiliary hot blast stove 5; the gas pipe 6, the flue gas pipe 10, the air pipe 7, the hot air pipe 8, and the air inlet pipe 9 are all three-way pipes, and one of the pipes in each three-way pipe is connected to the auxiliary hot blast stove 5.

[0034] refer to Figure 2 , Figure 3 , Figure 4 and Figure 6 The other two pipes in gas pipe 6 are connected to the main gas pipes of hot blast stove group I3 and hot blast stove group II4, respectively. Each of the other two pipes in gas pipe 6 is equipped with a butterfly valve 11, which is used to control the switching of gas. The other two pipes in air pipe 7 are connected to the main air pipes of hot blast stove group I3 and hot blast stove group II4, respectively. Each of the other two pipes in air pipe 7 is equipped with a switch valve 13, which is used to control the switching of combustion air. The other two pipes in flue gas pipe 10 are connected to the main flue gas pipes of hot blast stove group I3 and hot blast stove group II4, respectively. Each pipe is also equipped with a switch valve 13, which is used to control the switching of flue gas; the other two pipes in the air inlet pipe 9 are respectively connected to the main air inlet pipes of hot blast stove group I3 and hot blast stove group II4. The pipe in the air inlet pipe 9 connected to the auxiliary hot blast stove 5 is equipped with a wind control valve I14, and the other two pipes in the air inlet pipe 9 are respectively equipped with a wind control valve II15; through this structure, the auxiliary hot blast stove 5 can share the same main gas pipe, main combustion air pipe, main flue gas exhaust pipe and main air inlet pipe with hot blast stove group I3 or hot blast stove group II4, making full use of existing resources and reducing manufacturing costs.

[0035] refer to Figure 2 and Figure 5Two other pipes in the hot air duct 8 are connected to the hot air main pipes of blast furnace I1 and blast furnace II2, respectively. Hot air valve 16 and vent valve 17 are respectively installed on the other two pipes in the hot air duct 8. Both hot air valve 16 and vent valve 17 are gate valves. The valve plates of the hot air valve 16 on the two pipes are mirror images of each other. Heat-resistant sealing elements are provided on the valve plates of air control valve II15 and hot air valve 16 to improve the sealing performance of the valve plates. A pressure control component 18 is installed on the pipe between hot air valve 16 and vent valve 17. The pressure control component 18 includes a pressure control pipe 181 and a pressure control valve 182 installed on the pressure control pipe 181.

[0036] refer to Figure 2 and Figure 6 The air intake duct 9 has two air control valves II 15 on two other ducts. The two air control valves II 15 are butterfly valves, and the valve plates of the two air control valves II 15 are also mirrored. An exhaust duct 19 is provided between the two air control valves II 15, and an exhaust valve 20 is provided on the exhaust duct 19. It also includes a pressure stabilizing component, which includes a pressure stabilizing pipe and a pressure stabilizing valve provided on the pressure stabilizing pipe. The two ends of the pressure stabilizing pipe are respectively connected to one of the ducts in the air intake duct 9 and are located on the upper and lower sides of the air control valve I 14. The diameter of the pressure stabilizing pipe is smaller than the diameter of the air intake duct 9.

[0037] refer to Figures 1-6 When one of the hot blast stoves in hot blast stove group I3 or hot blast stove group II4 fails, the auxiliary hot blast stove 5 will be put into use to replace the faulty hot blast stove and the faulty hot blast stove will be repaired. In this example, the auxiliary hot blast stove 5 will be put into use to replace the faulty hot blast stove when one of the hot blast stoves in hot blast stove group I3 fails.

[0038] Before auxiliary hot blast stove 5 sends hot blast into the blast furnace:

[0039] First, open the switch valve 13 on the gas pipeline 6 connected to the main gas pipeline in the hot blast stove group I3, and at the same time open the switch valve 13 on the air pipeline 7 connected to the main combustion air pipeline in the hot blast stove group I3. Gas and air are then introduced into the combustion chamber of the auxiliary hot blast stove 5 through the gas pipeline 6 and the air pipeline 7 for complete combustion and to generate a large amount of heat. The heat is used to heat the heat storage checker bricks in the auxiliary hot blast stove 5 so that the temperature of the heat storage checker bricks reaches the predetermined temperature.

[0040] When auxiliary hot blast stove 5 sends hot blast into the blast furnace:

[0041] After high-temperature heating, the furnace temperature of the auxiliary hot air furnace 5 is high and the furnace pressure is low. Before a large amount of cold air is injected into the furnace, the furnace pressure needs to be adjusted. At this time, the pressure is stabilized by a pressure stabilizer.

[0042] During pressure stabilization, first close the air control valve I14 on the air inlet pipe 9. Then, exhaust air is drawn out through the exhaust pipe 19 connected to the hot blast furnace group II4, at which time the pressure in this pipe decreases. Then, air is introduced into the exhaust pipe 19 connected to the hot blast furnace group I3, increasing the pressure in this pipe. Under the action of greater pressure, the air control valve II15 on this pipe can be easily opened. Then, the cold air in the main air inlet pipe 9 of the hot blast furnace group I3 enters this pipe and enters the auxiliary hot blast furnace 5 through the pressure stabilization pipe. Air is continuously supplied into the furnace through the pressure stabilization pipe until the pressure in the furnace reaches the set pressure. Then, the air control valve I14 is opened and the pressure stabilization valve is closed. A large amount of cold air enters the auxiliary hot blast furnace 5 and is heated by the heat storage checker bricks to the set temperature. Then, it is discharged through the hot air pipe 8.

[0043] When air is introduced into the auxiliary hot blast furnace 5, the pressure between the two air control valves II15 is relatively high. The pressure inside the pipe connected to the hot blast furnace group II4 is relatively low due to the air being drawn out by the exhaust pipe 19. Under the action of the pressure difference, the air control valve II15 on the pipe connected to the hot blast furnace group II4 is sealed more tightly, and there will be no air leakage.

[0044] During the discharge process of hot air duct 8, hot air is present in the hot air duct 8 between hot air valve 16 and auxiliary hot air stove 5. The pipe pressure in this section of hot air duct 8 is relatively low. At this time, in order to ensure that the hot air flows to blast furnace I1, the pressure control pipe 181 set on the pipe connected to hot air stove group II4 is used to pressurize the pipe, thereby increasing the pressure in the pipe. Under the action of pressure difference, the hot air valve 16 on the pipe is sealed more tightly, and there will be no air leakage. At the same time, the pressure control pipe 181 set on the pipe connected to hot air stove group I3 exhausts the air, thereby reducing the pressure in the pipe. Under the action of pressure difference, the hot air valve 16 on the pipe can be opened easily, and the hot air flows into blast furnace I1 through this pipe.

[0045] refer to Figure 5 Each pipe of the hot air duct 8 is equipped with a corrugated pipe 22. When hot air flows through the hot air duct 8 to the blast furnace, the hot air duct 8 is prone to expansion and elongation after being heated by high temperature. The corrugated pipe 22 can play a buffering role to prevent the hot air duct 8 from exploding at high temperature.

[0046] refer to Figure 5The hot air valve 16 and the vent valve 17 are also equipped with cooling components (not shown in the figure) for cooling. When hot air flows from the hot air duct 8, the temperature of the hot air valve 16 and the vent valve 17 is high. If the hot air valve 16 and the vent valve 17 work at high temperature for a long time, they are prone to damage. At this time, the cooling components can cool down the hot air valve 16 and the vent valve 17 to prevent them from being damaged by high temperature. The cooling components are made by arranging multiple cooling water pipes around the valve seat and supplying cooling water into the cooling water pipes. The cooling water absorbs heat to achieve the purpose of cooling down the high temperature of the hot air valve 16 and the vent valve 17.

[0047] In summary: By setting up auxiliary hot blast stove 5, when one of the hot blast stoves in hot blast stove group I3 or hot blast stove group II4 malfunctions and needs maintenance, auxiliary hot blast stove 5 can be put into use as a backup stove, ensuring that each blast furnace is still equipped with three hot blast stoves, thus ensuring that the hot blast temperature of the blast furnace is not affected by the maintenance of the hot blast stoves, improving production efficiency and reducing costs; by setting hot blast valves 16 on two other pipes of hot blast duct 8, with the valve plates inside the two hot blast valves 16 mirrored, and by setting pressure control components 18 on two other pipes of hot blast duct 8, when hot blast is supplied to the blast furnace, the pressure in the pipe is adjusted by the pressure control components 18, and the hot blast valves 16 are sealed more tightly under the action of pressure difference, so that there will be no air leakage.

[0048] The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be used to limit the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A hot blast stove system for blast furnaces, the blast furnaces comprising a blast furnace I (1) and a blast furnace II (2), the hot blast stove system comprising a hot blast stove group I (3) and a hot blast stove group II (4), characterized in that, The hot blast furnace system also includes: Auxiliary hot blast stove (5), which cooperates with the hot blast stove group I (3) to supply hot air into the blast furnace I (1), or the auxiliary hot blast stove (5) cooperates with the hot blast stove group II (4) to supply hot air into the blast furnace II (2); Gas pipe (6), air pipe (7), hot air pipe (8), air inlet pipe (9), and flue gas pipe (10) are respectively connected to the auxiliary hot air furnace (5). The hot air pipe (8) and air inlet pipe (9) are both three-way pipes, and one of the pipes in each three-way pipe is connected to the auxiliary hot air furnace (5). Two other pipes in the hot air pipe (8) are respectively connected to blast furnace I (1) and blast furnace II (2), and hot air valve (16) and vent valve (17) are respectively provided on the other two pipes in the hot air pipe (8). A pressure control component (18) is provided on the pipe between the hot air valve (16) and the vent valve (17). The valve plates of the hot air valve (16) on the two pipes are mirror images of each other. The other two pipes in the air inlet pipe (9) are respectively connected to the main air inlet pipes in the hot blast furnace group I (3) and the hot blast furnace group II (4). The pipe in the air inlet pipe (9) connected to the auxiliary hot blast furnace (5) is equipped with a wind control valve I (14). The other two pipes in the air inlet pipe (9) are respectively equipped with a wind control valve II (15). The pressure control component (18) includes a pressure control pipe (181) and a pressure control valve (182) disposed on the pressure control pipe (181).

2. The hot blast stove system for blast furnaces according to claim 1, characterized in that, Each of the hot air ducts (8) is provided with a corrugated pipe (22).

3. The blast furnace hot blast stove system according to claim 1 or 2, characterized in that, The hot air valve (16) and the vent valve (17) are also equipped with cooling components for cooling them.

4. The hot blast stove system for blast furnaces according to claim 3, characterized in that, It also includes a pressure stabilizing component, which includes a pressure stabilizing pipe and a pressure stabilizing valve disposed on the pressure stabilizing pipe. The two ends of the pressure stabilizing pipe are respectively connected to one of the pipes in the air inlet pipe (9) and are located on the upper and lower sides of the air control valve I (14).

5. The hot blast stove system for blast furnaces according to claim 4, characterized in that, The number of air control valves II (15) on the other two pipes in the air inlet pipe (9) is two, and an exhaust pipe (19) is provided between the two air control valves II (15), and an exhaust valve (20) is provided on the exhaust pipe (19).

6. The hot blast stove system for blast furnaces according to claim 1 or 5, characterized in that, The gas pipeline (6), the flue gas pipeline (10), and the air pipeline (7) are also three-way pipelines. One of the pipelines in each three-way pipeline is connected to the auxiliary hot air furnace (5). The other two pipelines in the gas pipeline (6) are respectively connected to the main gas pipes in the hot air furnace group I (3) and the hot air furnace group II (4). The other two pipelines in the air pipeline (7) are respectively connected to the main combustion air pipes in the hot air furnace group I (3) and the hot air furnace group II (4). The other two pipelines in the flue gas pipeline (10) are respectively connected to the main exhaust pipes in the hot air furnace group I (3) and the hot air furnace group II (4).

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