CN108707713B - Hot blast stove heat preservation device and method - Google Patents
Hot blast stove heat preservation device and method Download PDFInfo
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- CN108707713B CN108707713B CN201810636017.4A CN201810636017A CN108707713B CN 108707713 B CN108707713 B CN 108707713B CN 201810636017 A CN201810636017 A CN 201810636017A CN 108707713 B CN108707713 B CN 108707713B
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- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B9/00—Stoves for heating the blast in blast furnaces
Abstract
The invention discloses a heat preservation device and a heat preservation method for a hot blast stove, and belongs to the technical field of blast furnace ironmaking. The hot blast stove heat preservation device comprises: a manhole is arranged on the cold air pipeline, an adjusting valve is arranged on the cold air pipeline, and the output end of the cold air pipeline is communicated with the bottom of the hot blast stove; the input end of the hot air pipeline is communicated with the top of the hot air furnace, and a blocking plate is detachably arranged at the communication part of the hot air pipeline and the blast furnace; the input end of the backflow damping-down pipeline is communicated with the hot air pipeline, and the input end of the backflow damping-down pipeline is arranged between the first stop valve and the blocking plate; the first temperature detector is arranged in a flue of the hot blast stove and is connected with the controller; the second temperature detector is arranged in the hot air pipeline and is connected with the controller. The hot blast stove heat preservation device and the method have the advantages of simple operation and small equipment maintenance amount, realize the long-term heat preservation operation of the hot blast stove which is safe, efficient and energy-saving, and can quickly and efficiently provide high air temperature for the blast furnace when the production is recovered.
Description
Technical Field
The invention relates to the technical field of blast furnace ironmaking, in particular to a heat preservation device and a heat preservation method for a hot blast stove.
Background
When the iron-making blast furnace is normally produced, blast air required by the blast furnace is provided by a high-power blast furnace fan, cold air is heated and heated after passing through the heat storage checker bricks of the hot blast furnace, and then enters the blast furnace after sequentially passing through a hot air main pipe, a hot air ring pipe, a gooseneck pipe and a blow pipe.
When the blast furnace needs to be stopped for a long time due to major and medium maintenance, braising and the like, the hot blast furnace needs to be subjected to heat preservation operation in order to ensure the service life of refractory materials and a flue grate in the hot blast furnace and timely and rapidly provide hot air for the blast furnace when production is recovered. The hot blast stove heat preservation operation mainly comprises two parts, on one hand, the temperature of the top of the hot blast stove is prevented from being too low through heating in a burning furnace, and on the other hand, the temperature of a flue is prevented from being too high through air supply and cooling.
And the traditional operation mode of preventing the flue temperature from being too high through air supply cooling is as follows:
blast furnaces and air supply systems are usually isolated by building retaining walls in hot air pipelines, and in addition, in order to reduce electric quantity consumption during air supply, required cold air is guaranteed by allocating other blast furnaces or by additionally arranging a temporary pipeline to be connected into a cold air pipeline by a combustion fan. However, this method not only has a large amount of construction and equipment maintenance, but also requires frequent furnace burning and air supply operations, and has a large consumption of gas and electricity, and the blast furnace cannot provide high air temperature for the blast furnace quickly and in time after the production of the blast furnace is resumed.
Disclosure of Invention
The invention provides a heat preservation device and a heat preservation method for a hot blast stove, which solve or partially solve the technical problems that in the prior art, cold air required by heat preservation operation is guaranteed by the way of allocating other blast furnaces or additionally arranging a temporary pipeline by a combustion fan to be connected into a cold air pipeline, so that the construction and equipment maintenance amount is large, the resource consumption is large, and high air temperature cannot be timely and rapidly provided for the blast furnace after the production of the blast furnace is recovered.
In order to solve the technical problem, the invention provides a heat preservation device of a hot blast stove, which is communicated with a blast furnace, and comprises: the device comprises a cold air pipeline, a hot air pipeline, a backflow damping-down pipeline, a first temperature detector, a second temperature detector and a controller; a manhole is formed in the cold air pipeline, an adjusting valve is arranged on the cold air pipeline, and the output end of the cold air pipeline is communicated with the bottom of the hot blast stove; the input end of the hot air pipeline is communicated with the top of the hot air furnace, the output end of the hot air pipeline is communicated with the blast furnace, a blocking plate is detachably arranged at the communication position of the hot air pipeline and the blast furnace, and a first stop valve is arranged on the hot air pipeline; the input end of the backflow damping-down pipeline is communicated with the hot air pipeline, the height of the output end of the backflow damping-down pipeline is higher than that of the input end of the backflow damping-down pipeline, the input end of the backflow damping-down pipeline is arranged between the first stop valve and the blocking plate, and a second stop valve is arranged on the backflow damping-down pipeline; the first temperature detector is arranged in a flue of the hot blast stove and is connected with the controller; the second temperature detector is arranged in the hot air pipeline and is connected with the controller; the controller is connected with the regulating valve, receives a first temperature signal sent by the first temperature detector and a second temperature signal sent by the second temperature detector, and sends an opening degree signal to the regulating valve according to the first temperature signal and the second temperature signal.
Further, the hot blast stove heat preservation device further comprises: a pressure equalizing pipeline and a pressure equalizing valve; the pressure equalizing pipeline is provided with the pressure equalizing valve; the input end and the output end of the pressure equalizing pipeline are both communicated with the cold air pipeline; the input end of the pressure equalizing pipeline is arranged between the manhole and the regulating valve, and the output end of the pressure equalizing pipeline is arranged between the regulating valve and the hot blast stove.
Further, the hot blast stove heat preservation device further comprises: and the third temperature detector is arranged on the top of the hot blast stove and connected with the controller, the third temperature detector sends a third temperature signal to the controller, and the controller controls the heating power of the top of the hot blast stove according to the third temperature signal.
Further, the blocking plate is made of asbestos felt and an iron plate.
Further, the hot blast stove heat preservation device further comprises: a blower and an air supply duct; the input end of the air supply pipeline is communicated with the air blower, the output end of the air supply pipeline is communicated with the input end of the cold air pipeline, and a third stop valve is arranged on the air supply pipeline; and blind plates are detachably arranged at the positions where the output end of the air supply pipeline is communicated with the input end of the cold air pipeline.
Based on the same inventive concept, the invention also provides a heat preservation method of the hot blast stove, which comprises the following steps: heating the top of the hot blast stove, and arranging a blocking plate at the communication part of the hot blast pipeline and the blast furnace; opening the regulating valve, the first stop valve and the second stop valve; natural wind is conveyed into a flue of the hot blast stove through an air inlet formed in a cold air pipeline; natural wind carrying away heat of a flue of the hot blast stove enters an input end of the backflow damping-down pipeline through a hot air pipeline and enters an output end of the backflow damping-down pipeline to be discharged, and the height of the output end of the backflow damping-down pipeline is higher than that of the input end of the backflow damping-down pipeline; the first temperature detector sends a first temperature signal of a flue of the hot blast stove to the controller, the second temperature detector sends a second temperature signal of the hot blast pipeline to the controller, and the controller sends an opening degree signal to the regulating valve according to the first temperature signal and the second temperature signal; the air supply quantity of the cold air pipeline is adjusted by controlling the opening of the adjusting valve, and then the temperature of the flue of the hot air furnace and the temperature of the hot air pipeline are controlled.
Further, the setting of the blocking plate at the communication position of the hot air pipeline and the blast furnace comprises: when residual gas in the blast furnace needs to be discharged, closing the first stop valve, withdrawing the blocking plate from the communication position of the hot air pipeline and the blast furnace, and allowing the residual gas in the blast furnace to enter the damping-down pipeline through the hot air pipeline and be discharged; after the residual gas in the blast furnace is discharged, the blocking plate is inserted into the communication position of the hot air pipeline and the blast furnace, and the first stop valve is opened.
Further, the controlling the temperature of the flue and the hot air pipeline of the hot blast stove comprises: the flue temperature of the hot blast stove is controlled at 200-280 ℃; the temperature of the hot air pipeline is controlled to be 400-600 ℃.
Further, the heat preservation method of the hot blast stove further comprises the following steps: a third temperature detector is arranged on the top of the hot blast stove; the third temperature detector sends a third temperature signal of the top of the hot blast stove to the controller, and the controller controls the heating power of the top of the hot blast stove according to the third temperature signal and controls the top temperature of the hot blast stove to be 800-.
Further, the heat preservation method of the hot blast stove further comprises the following steps: when the blast furnace is overhauled, a blind plate is arranged at the position where the output end of the air supply pipeline is communicated with the input end of the cold air pipeline; after the blast furnace is overhauled, the manhole and the second stop valve are closed, the blocking plate is withdrawn from the communication position of the hot air pipeline and the blast furnace, the air blower is started, the third stop valve is opened, air blown by the air blower sequentially passes through the air supply pipeline and the cold air pipeline to enter the hot air furnace, and the air is heated by the hot air furnace and then is conveyed into the blast furnace through the hot air pipeline.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
because the furnace top of the hot blast furnace is heated, and the connecting part of the hot blast pipeline and the blast furnace is provided with the blocking plate, hot blast can be generated in the hot blast furnace and the hot blast pipeline, and negative pressure can be generated by the hot blast in the hot blast pipeline, and because the manhole, the regulating valve, the first stop valve and the second stop valve which are arranged on the cold blast pipeline are opened, natural wind can be conveyed into the flue of the hot blast furnace through the manhole arranged on the cold blast pipeline under the action of the negative pressure, so the natural wind brings away heat in the flue of the hot blast furnace, the natural wind which brings away the heat in the flue of the hot blast furnace enters the input end of the backflow damping pipeline through the hot blast pipeline and enters the output end of the backflow damping pipeline to be discharged, the output end of the backflow damping pipeline is higher than the input end of the backflow damping pipeline, therefore, the flue can be cooled without external equipment, meanwhile, negative pressure is convenient to form, the first temperature detector sends a first temperature signal of a flue of the hot blast stove to the controller, the second temperature detector sends a second temperature signal of the hot blast pipeline to the controller, the controller sends an opening degree signal to the regulating valve according to the first temperature signal and the second temperature signal, the air supply quantity of the cold blast pipeline is adjusted by controlling the opening degree of the regulating valve, and further the temperature of the flue of the hot blast stove and the temperature of the hot blast pipeline is controlled, so that the temperature of the flue of the hot blast stove and the temperature of the hot blast pipeline can be ensured to be within a proper range, equipment damage can not be caused, the operation is simple, the equipment maintenance quantity is small, safe, efficient and energy-saving long-term heat preservation operation of the hot blast stove is realized, and high air temperature can be quickly and efficiently provided.
Drawings
Fig. 1 is a schematic structural diagram of a heat preservation device of a hot blast stove provided by an embodiment of the invention.
Detailed Description
Referring to fig. 1, the hot blast stove heat preservation device provided by the embodiment of the present invention is communicated with a blast furnace 13, and includes: a cold air pipeline 2, a hot air pipeline 10, a backflow damping-down pipeline 16, a first temperature detector 6, a second temperature detector 11 and a controller.
A manhole 1 is formed in the cold air pipeline 2, an adjusting valve 3 is arranged on the cold air pipeline 2, and the output end of the cold air pipeline 2 is communicated with the bottom of the hot air furnace 4.
The input end of the hot air pipeline 10 is communicated with the top of the hot air furnace 4, the output end of the hot air pipeline 10 is communicated with the blast furnace 13, a blocking plate 12 is detachably arranged at the communication position of the hot air pipeline 10 and the blast furnace 13, and a first stop valve 9 is arranged on the hot air pipeline 10.
The input end of the backflow damping-down pipeline 16 is communicated with the hot air pipeline 10, the output end of the backflow damping-down pipeline 16 is higher than the input end of the backflow damping-down pipeline 16, the input end of the backflow damping-down pipeline 16 is arranged between the first stop valve 9 and the blocking plate 12, and the backflow damping-down pipeline 16 is provided with a second stop valve 15.
The first temperature detector 6 is arranged in the flue 5 of the hot blast stove 4, and the first temperature detector 6 is connected with the controller.
The second temperature detector 11 is arranged in the hot air duct 10, and the second temperature detector 11 is connected with the controller.
The controller is connected with the regulating valve 3, receives the first temperature signal sent by the first temperature detector 6 and the second temperature signal sent by the second temperature detector 11, and sends an opening degree signal to the regulating valve 3 according to the first temperature signal and the second temperature signal.
In the embodiment of the present invention, since the top 7 of the hot-air furnace 4 is heated and the connection between the hot-air duct 10 and the blast furnace 13 is provided with the blocking plate 12, hot air is generated in the hot-air furnace 3 and the hot-air duct 10, and the hot air can generate negative pressure in the hot-air duct 10, since the manhole 1, the adjusting valve 3, the first stop valve and the second stop valve 15 provided on the cold-air duct 2 are opened, and since the hot-air furnace 3 and the hot-air duct 10 are hot air, natural air can convey natural air into the flue 5 of the hot-air furnace 4 through the manhole 1 provided on the cold-air duct 2 under the action of the negative pressure, the natural air carries away heat in the flue 5 of the hot-air furnace 4, and since the natural air carrying away the heat of the flue of the hot-air furnace 4 enters the input end of the backflow damping-down duct 16 through the hot-air duct 10 and, the output end of the backflow damping-down pipeline 16 is higher than the input end of the backflow damping-down pipeline 16, so that the flue 5 can be cooled, external equipment is not needed, and negative pressure is convenient to form, because the first temperature detector 6 sends a first temperature signal of the flue 5 of the hot air furnace 4 to the controller, the second temperature detector 11 sends a second temperature signal of the hot air pipeline 10 to the controller, the controller sends an opening degree signal to the adjusting valve 3 according to the first temperature signal and the second temperature signal, the air supply quantity of the cold air pipeline 2 is adjusted by controlling the opening degree of the adjusting valve 3, and then the temperatures of the flue 5 and the hot air pipeline 10 of the hot air furnace 4 are controlled, so that the temperatures of the flue 5 and the hot air pipeline 10 of the hot air furnace 4 can be ensured to be in a proper range, equipment damage can not be caused, the operation is simple, the equipment maintenance quantity is small, and safe, The high-efficiency and energy-saving hot blast stove is operated for long-term heat preservation, and can quickly and efficiently provide high blast temperature for the blast furnace when production is recovered.
The hot blast stove heat preservation device of the invention also comprises: a pressure equalizing pipe 17 and a pressure equalizing valve 18.
A pressure equalizing valve 18 is arranged on the pressure equalizing pipeline 17. The input end and the output end of the pressure equalizing pipeline 17 are both communicated with the cold air pipeline 2.
The input end of the pressure equalizing pipeline 17 is arranged between the air inlet 1 and the regulating valve 3, and the output end of the pressure equalizing pipeline 17 is arranged between the regulating valve 3 and the hot blast stove 4, so that the same pressure at the two ends of the regulating valve 3 is ensured, and the adjustment of the opening degree of the regulating valve 3 is facilitated.
The hot blast stove heat preservation device of the invention also comprises: and a third temperature detector 8.
The third temperature detector 8 is fixedly arranged on the top 7 of the hot blast stove 4. Specifically, in the present embodiment, the third temperature detector 8 is fixedly provided on the roof 7 of the hot blast stove 4 by bolts, and in other embodiments, the third temperature detector 8 may be fixedly provided on the roof 7 of the hot blast stove 4 by other means, such as shaft pins or the like. The present embodiment is not limited.
The third temperature detector 8 is connected with the controller, the third temperature detector 8 sends a third temperature signal to the controller, and the controller controls the heating power of the top 7 of the hot blast stove 4 according to the third temperature signal. The damage to equipment caused by overhigh temperature of the top 7 of the hot blast stove 4 can be avoided, and the influence on the subsequent air supply of the blast furnace caused by overlow temperature of the top 7 of the hot blast stove 4 can also be avoided.
The first temperature detector 6, the second temperature detector 11, and the third temperature detector 8 may be thermocouples.
The structure of the closure plate 12 will be described in detail.
The blocking plate 12 is made of asbestos felt and iron plate, can resist high temperature and has a sealing function.
The hot-blast furnace heat preservation device still includes: a blower 19 and a blower duct 20.
The input end of the air supply pipeline 20 is communicated with the air blower 19, the output end of the air supply pipeline 20 is communicated with the input end of the cold air pipeline 2, and the air supply pipeline 20 is provided with a third stop valve 21 which can supply air to the blast furnace 13 after the blast furnace 13 is overhauled.
A blind plate 22 is detachably arranged at the communication position of the output end of the air supply pipeline 20 and the input end of the cold air pipeline 2.
Based on the same inventive concept, the invention also provides a heat preservation method of the hot blast stove, which comprises the following steps:
step 1, heating the top 7 of the hot blast stove 4, and arranging a blocking plate 12 at the communication part of a hot blast pipeline 10 and a blast furnace 13.
And step 2, opening the regulating valve 3, the first stop valve 9 and the second stop valve 15.
And 3, conveying natural wind into a flue 5 of a hot blast stove 4 through a manhole 1 arranged on the cold air pipeline 2.
And 4, allowing the natural wind which takes away the heat of the flue 5 of the hot blast stove 4 to enter a backflow damping-down pipeline 16 through a hot air pipeline 10 and be discharged.
And 5, sending a first temperature signal of a flue 5 of the hot blast stove 4 to a controller by the first temperature detector 6, sending a second temperature signal of the hot blast pipeline 10 to the controller by the second temperature detector 11, and sending an opening degree signal to the regulating valve 3 by the controller according to the first temperature signal and the second temperature signal.
And step 6, adjusting the air supply quantity of the cold air pipeline 2 by controlling the opening degree of the adjusting valve 3, and further controlling the temperature of a flue 5 of the hot air furnace 4 and the temperature of the hot air pipeline 10.
Step 1 is described in detail.
Set up the closure plate in hot-blast pipeline and blast furnace intercommunication department and include: when residual gas in the blast furnace 13 needs to be discharged, the first stop valve 9 is closed, the blocking plate 12 is withdrawn from the communication position of the hot air pipeline 10 and the blast furnace 13, and the residual gas in the blast furnace 13 enters the backflow damping-down pipeline 16 through the hot air pipeline 10 to be discharged; after the residual gas in the blast furnace 13 is discharged, the blocking plate 12 is inserted into the communication position of the hot air pipeline 10 and the blast furnace 13, and the first stop valve 9 is opened, so that the residual gas in the blast furnace 13 can be discharged, and the safety of the blast furnace 13 is ensured.
Step 6 is described in detail.
Controlling the temperature of the flue 5 and the hot air duct 10 of the hot blast stove 4 comprises: the temperature of the flue 5 of the hot blast stove 4 is controlled to be 200 ℃ and 280 ℃, so that the safety of the flue 5 of the hot blast stove 4 is ensured; the temperature of the hot air pipeline 10 is controlled to be 400-600 ℃, so that the safety of the hot air pipeline 10 and the damping down pipeline 16 is ensured.
The heat preservation method of the hot blast stove further comprises the following steps: a third temperature detector 8 is arranged on the top 7 of the hot blast stove 4; the third temperature detector 8 sends a third temperature signal of the top 7 of the hot blast stove 4 to the controller, the controller controls the heating power of the top of the hot blast stove 4 according to the third temperature signal, the temperature of the top 7 of the hot blast stove 4 is controlled at 800 plus 1300 ℃, the safety of the hot blast stove 4 is ensured, the damage to equipment caused by the overhigh temperature of the top 7 of the hot blast stove 4 is avoided, and meanwhile, the influence on the subsequent air supply of the blast furnace caused by the overlow temperature of the top 7 of the hot blast stove 4 can be avoided.
The heat preservation method of the hot blast stove further comprises the following steps: when the blast furnace 13 is overhauled, the blind plate 22 is arranged at the communication position of the output end of the air supply pipeline 20 and the input end of the cold air pipeline 2, so that the hot-blast stove 4 and the air blower 19 are effectively isolated, and accidents caused by the fact that coal gas generated by burning of the hot-blast stove 4 flows into the air blower 19 are avoided. After the blast furnace 13 is overhauled, the manhole 2 and the second stop valve 15 are closed, the blocking plate 12 is withdrawn from the communication position of the hot air pipeline 10 and the blast furnace 13, the air blower 19 is started, the third stop valve is opened, air blown by the air blower 19 sequentially passes through the air supply pipeline 20 and the cold air pipeline 2 to enter the hot air furnace 4, the air is heated by the hot air furnace 4 and then is conveyed into the blast furnace 13 through the hot air pipeline 10, and the process of supplying hot air to the blast furnace can be rapidly carried out.
In order to make the embodiments of the present invention more clear, the following description is made of the methods of using the embodiments of the present invention.
When the blast furnace 13 needs to be shut down for a long time due to overhaul, overhaul and the like, a blind plate 22 is arranged at the communication position of the output end of the air supply pipeline 20 and the input end of the cold air pipeline 2, meanwhile, the furnace top 7 of the hot blast furnace 4 is heated, a third temperature detector 8 is arranged on the furnace top 7 of the hot blast furnace 4, the third temperature detector 8 sends a third temperature signal of the furnace top 7 of the hot blast furnace 4 to a controller, the controller controls the heating power of the furnace top of the hot blast furnace 4 according to the third temperature signal, the temperature of the furnace top 7 of the hot blast furnace 4 is controlled at 800-1300 ℃, the safety of the hot blast furnace 4 is ensured, the equipment is prevented from being damaged due to overhigh temperature of the furnace top 7 of the hot blast furnace 4, and meanwhile, the influence on the subsequent air. The communicated part of the hot air pipeline 10 and the blast furnace 13 is provided with a blocking plate 12 for isolating the contact between the blast furnace 13 and an air supply system, ensuring the safety of the air supply system and avoiding the influence on the overhaul or smoldering of the blast furnace 13 caused by the hot air of the hot air furnace 4 entering the blast furnace 13.
When the regulating valve 3, the first stop valve and the second stop valve 9 15 are opened, the top 7 of the hot blast stove 4 is heated, so that hot air is present in the hot blast stove 3 and the hot air duct 10, and the hot air can generate negative pressure in the hot air duct 10. Under the effect of negative pressure, carry natural wind to the flue 5 of hot-blast furnace 4 in through the manhole 1 of seting up on the cold air duct 2, because manhole 1 has just been seted up on the cold air duct 2 itself, just need not trompil on cold air duct 2, guaranteed the intensity of cold air duct 2 itself.
The heat in the flue 5 of the natural wind carrying hot blast stove 4 becomes hot air, hot air enters the backflow damping down pipeline 16 through the hot air pipeline 10 and is discharged, the flue 5 can be cooled, external equipment is not needed, the operation is simple, the equipment maintenance amount is small, the long-term heat preservation operation of the hot blast stove with safety, high efficiency and energy saving is realized, and the high wind temperature can be quickly and efficiently provided for the blast furnace when the production is recovered.
The first temperature detector 6 sends a first temperature signal of a flue 5 of the hot blast stove 4 to the controller, the second temperature detector 11 sends a second temperature signal of the hot blast stove 4 to the controller, the controller sends an opening degree signal to the regulating valve 3 according to the first temperature signal and the second temperature signal, the air supply quantity of the cold air pipeline 2 is regulated by controlling the opening degree of the regulating valve 3, the temperature of the flue 5 of the hot blast stove 4 is enabled to be at 280 ℃ through controlling the air supply quantity of the cold air pipeline 2, the safety of the flue 5 of the hot blast stove 4 can be ensured, the temperature of the hot air pipeline 10 is enabled to be at 600 ℃ through controlling the air supply quantity of the cold air pipeline 2, the safety of the hot air pipeline 10 and the backflow damping-down pipeline 16 can be ensured, the heat preservation effect of the hot air pipeline 10 is ensured, and the temperatures of the flue 5 and the hot air pipeline 10 of the.
When residual gas in the blast furnace 13 needs to be discharged, the first stop valve 9 is closed every 12 hours, and hot air in the hot air pipeline 10 is prevented from entering the blast furnace 13. The blocking plate 12 is withdrawn from the communication position of the hot air pipeline 10 and the blast furnace 13, residual gas in the blast furnace 13 enters the damping-down pipeline 16 through the hot air pipeline 10 to be discharged, after 20 minutes, the residual gas in the blast furnace 13 is completely discharged, the blocking plate 12 is inserted into the communication position of the hot air pipeline 10 and the blast furnace 13, the first stop valve 9 is opened, the residual gas in the blast furnace 13 can be discharged, the safety of the blast furnace 13 is ensured, and the combustion and air supply operation is forbidden when the operation is carried out.
The third temperature detector 8 is arranged on the top 7 of the hot blast stove 4, the third temperature detector 8 sends a third temperature signal of the top 7 of the hot blast stove 4 to the controller, the controller controls the heating power of the top of the hot blast stove 4 according to the third temperature signal, the temperature of the top 7 of the hot blast stove 4 is controlled to be 800-1300 ℃, the safety of the hot blast stove 4 is ensured, the damage to equipment due to overhigh temperature of the top 7 of the hot blast stove 4 is avoided, and meanwhile, the influence on the subsequent air supply of the blast furnace due to overlow temperature of the top 7 of the hot blast stove 4 can also be avoided.
When the blast furnace 13 needs to be stopped for a long time due to the reasons of overhaul, medium maintenance, furnace stewing and the like, the manhole 1 and the second stop valve 15 are closed, the blocking plate 12 is withdrawn from the communication position of the hot air pipeline 10 and the blast furnace 13, the air blower 19 is started, the third stop valve 21 is opened, air blown by the air blower 19 sequentially passes through the air supply pipeline 20 and the cold air pipeline 2 to enter the hot air furnace 4, and is heated by the hot air furnace 4 and then conveyed into the blast furnace 13 through the hot air pipeline 10, so that the process of supplying hot air to the blast furnace can be ensured to be carried out rapidly.
According to the application, the blind plate 22 is clamped behind the third stop valve 21, the heat insulation blocking plate 12 is used for blocking the blast furnace and the hot air pipeline 10, the hot air furnace system is separated from the air blower 19 and the blast furnace 13, and a safe and airtight circulating space is created for the hot air furnace to implement heat preservation operation. And the residual gas in the pipe is drawn by opening the blocking plate 12 every 12 hours on the premise of prohibiting the operation of burning and blowing, so that the safety of the hot blast stove system is further improved. In the embodiment of the application, a combustion system that the furnace top 7 of the hot blast furnace 4 starts to burn when the temperature is lower than 800 ℃ and stops burning when the temperature is higher than 1300 ℃ and an air supply system that the flue 5 of the hot blast furnace 4 starts to supply air when the temperature exceeds 280 ℃ and stops supplying air when the temperature is lower than 200 ℃ are adopted, so that the aim of reducing the operation times of burning and supplying air to the maximum extent is fulfilled. In addition, the air supply temperature, namely the temperature in the hot air pipeline 10, is controlled to be 400-600 ℃, so that the heat preservation effect of the hot air pipeline 10 can be ensured while the safety of the backflow damping down pipeline 16 is ensured. The air inlet 1 of the cold air pipeline is opened, natural air can be sucked through negative pressure, cold air is supplied without other blast furnaces by adjusting the cold air or adding a temporary pipeline into the cold air pipeline by a combustion fan, the problem of high coal gas and electric quantity consumption in the prior art is solved, the heat preservation operation of the hot blast stove with high efficiency and low consumption is realized, and high air temperature can be quickly and efficiently provided for the blast furnaces when production is recovered.
Taking a 2650 cubic meter blast furnace in a certain iron and steel plant as an example, in order to ensure the safety of refractory materials and a flue grate of the hot blast furnace during the blast furnace shutdown period of 49 days and simultaneously ensure that the high air temperature can be quickly obtained when the blast furnace recovers production, the heat preservation operation of the hot blast furnace is implemented in four internal combustion type hot blast furnaces during the blast furnace shutdown period. The blind plate 22 is clamped behind the third stop valve 21, the heat insulation blocking plate 12 is used for blocking the blast furnace and the hot air pipeline 10, the hot air furnace system is separated from the blast blower 19 and the blast furnace 13, and a safe and closed circulation space is created for the heat preservation operation of the hot air furnace. And opening the plugging plate 12 to pull the residual gas in the pipeline for 20 minutes every 12 hours under the premise of prohibiting the operation of furnace burning and air supply. The furnace 4 starts to burn when the temperature of the furnace top 7 is lower than 800 ℃ and stops burning when the temperature is higher than 1300 ℃. The temperature of the flue 5 of the hot blast stove 4 is higher than 280 ℃ and starts air supply, and the air supply is stopped when the temperature is lower than 200 ℃. And opening an air inlet 1 of the cold air pipeline 2, and utilizing the negative pressure suction force generated by hot air in the air supply pipeline when the hot air furnace supplies air to achieve the purpose that natural air enters from a manhole of the cold air pipeline and is discharged by a backflow damping valve so as to reduce the temperature of a flue of the hot air furnace. The air blowing path is as follows: the manhole of the cold air pipeline → the regulating valve → the hot air furnace → the first stop valve → the hot air pipeline → the second stop valve.
During the blast furnace shutdown period, the hot blast stove implements the heat preservation operation of a small circulation method, the ignition frequency of each hot blast stove is reduced from once a day to once a week on the premise of ensuring the safety of refractory materials and a flue grate in the hot blast stove, and a combustion-supporting fan is not needed to be matched during the air supply period of the hot blast stove, so that 29 thousands of coal gas is saved every day on average, and the electric quantity is saved by 780KWh through ignition every time. When the blast furnace is recovered, the hot air temperature of the hot blast stove reaches over 800 ℃ only in 2 hours and 35 minutes. Production practices prove that the hot blast stove adopting the small circulation method has safe and reliable heat preservation operation, energy conservation and high efficiency, and can quickly and efficiently provide high blast temperature for the blast furnace when the blast furnace recovers production.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (7)
1. A hot blast stove heat preservation method is based on a hot blast stove heat preservation device, the hot blast stove heat preservation device is communicated with a blast furnace, and the hot blast stove heat preservation device comprises: the device comprises a cold air pipeline, a hot air pipeline, a backflow damping-down pipeline, a first temperature detector, a second temperature detector and a controller; a manhole is formed in the cold air pipeline, an adjusting valve is arranged on the cold air pipeline, and the output end of the cold air pipeline is communicated with the bottom of the hot blast stove; the input end of the hot air pipeline is communicated with the top of the hot air furnace, the output end of the hot air pipeline is communicated with the blast furnace, a blocking plate is detachably arranged at the communication position of the hot air pipeline and the blast furnace, and a first stop valve is arranged on the hot air pipeline; the input end of the backflow damping-down pipeline is communicated with the hot air pipeline, the height of the output end of the backflow damping-down pipeline is higher than that of the input end of the backflow damping-down pipeline, the input end of the backflow damping-down pipeline is arranged between the first stop valve and the blocking plate, and a second stop valve is arranged on the backflow damping-down pipeline; the first temperature detector is arranged in a flue of the hot blast stove and is connected with the controller; the second temperature detector is arranged in the hot air pipeline and is connected with the controller; the controller is connected with the regulating valve, receives a first temperature signal sent by the first temperature detector and a second temperature signal sent by the second temperature detector, and sends an opening degree signal to the regulating valve according to the first temperature signal and the second temperature signal; the hot blast stove heat preservation device further comprises: the third temperature detector is arranged at the top of the hot blast stove; the method is characterized by comprising the following steps:
heating the top of the hot blast stove, and arranging a blocking plate at the communication part of the hot blast pipeline and the blast furnace;
opening the regulating valve, the first stop valve and the second stop valve;
natural wind is conveyed into a flue of the hot blast stove through a manhole arranged on a cold wind pipeline;
natural wind carrying away heat of a flue of the hot blast stove enters an input end of the backflow damping-down pipeline through a hot air pipeline and enters an output end of the backflow damping-down pipeline to be discharged, and the height of the output end of the backflow damping-down pipeline is higher than that of the input end of the backflow damping-down pipeline;
the first temperature detector sends a first temperature signal of a flue of the hot blast stove to the controller, the second temperature detector sends a second temperature signal of the hot blast pipeline to the controller, and the controller sends an opening degree signal to the regulating valve according to the first temperature signal and the second temperature signal;
the air supply quantity of the cold air pipeline is adjusted by controlling the opening of the adjusting valve, so that the temperature of a flue of the hot blast stove and the temperature of the hot air pipeline are controlled;
the third temperature detector is connected with the controller, the third temperature detector sends a third temperature signal to the controller, and the controller controls the heating power of the top of the hot blast stove according to the third temperature signal and controls the top temperature of the hot blast stove to be 800-1300 ℃.
2. The hot blast stove heat preservation method according to claim 1, wherein the hot blast stove heat preservation device further comprises: a pressure equalizing pipeline and a pressure equalizing valve;
the pressure equalizing pipeline is provided with the pressure equalizing valve;
the input end and the output end of the pressure equalizing pipeline are both communicated with the cold air pipeline;
the input end of the pressure equalizing pipeline is arranged between the manhole and the regulating valve, and the output end of the pressure equalizing pipeline is arranged between the regulating valve and the hot blast stove.
3. The method of preserving heat in a hot blast stove according to claim 1, characterized in that:
the blocking plate is made of asbestos felt and an iron plate.
4. The hot blast stove heat preservation method according to claim 1, wherein the hot blast stove heat preservation device further comprises: a blower and an air supply duct;
the input end of the air supply pipeline is communicated with the air blower, the output end of the air supply pipeline is communicated with the input end of the cold air pipeline, and a third stop valve is arranged on the air supply pipeline;
and blind plates are detachably arranged at the positions where the output end of the air supply pipeline is communicated with the input end of the cold air pipeline.
5. The heat preservation method of the hot blast stove according to claim 1, wherein the step of arranging the blocking plate at the communication position of the hot blast pipeline and the blast furnace comprises the following steps:
when residual gas in the blast furnace needs to be discharged, closing the first stop valve, withdrawing the blocking plate from the communication position of the hot air pipeline and the blast furnace, and allowing the residual gas in the blast furnace to enter the backflow damping-down pipeline through the hot air pipeline and be discharged;
after the residual gas in the blast furnace is discharged, the blocking plate is inserted into the communication position of the hot air pipeline and the blast furnace, and the first stop valve is opened.
6. The method of claim 1, wherein controlling the temperature of the flue and hot air duct of the hot blast stove comprises:
the flue temperature of the hot blast stove is controlled at 200-280 ℃;
the temperature of the hot air pipeline is controlled to be 400-600 ℃.
7. The hot blast stove heat preservation method according to claim 1, further comprising:
when the blast furnace is overhauled, a blind plate is arranged at the position where the output end of the air supply pipeline is communicated with the input end of the cold air pipeline;
after the blast furnace is overhauled, the manhole and the second stop valve are closed, the blocking plate is withdrawn from the communication position of the hot air pipeline and the blast furnace, the air blower is started, the third stop valve is opened, air blown by the air blower sequentially passes through the air supply pipeline and the cold air pipeline to enter the hot air furnace, and the air is heated by the hot air furnace and then is conveyed into the blast furnace through the hot air pipeline.
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| CN201810636017.4A CN108707713B (en) | 2018-06-20 | 2018-06-20 | Hot blast stove heat preservation device and method |
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| CN111088411B (en) * | 2020-01-16 | 2022-03-25 | 邯郸钢铁集团有限责任公司 | Air convection heat preservation method for blast furnace hot blast stove |
| CN111647702A (en) * | 2020-06-16 | 2020-09-11 | 山东莱钢永锋钢铁有限公司 | Heat preservation method for braising furnace of hot blast stove |
| CN114645106B (en) * | 2022-03-28 | 2023-03-14 | 中天钢铁集团(南通)有限公司 | Heat preservation and air supply system and method for hot blast stove burning |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104232825A (en) * | 2014-09-02 | 2014-12-24 | 莱芜钢铁集团有限公司 | Thermal insulation method of silica brick hot blast stove |
| CN108004358A (en) * | 2017-12-27 | 2018-05-08 | 中冶京诚工程技术有限公司 | Control System of Airheater |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104232825A (en) * | 2014-09-02 | 2014-12-24 | 莱芜钢铁集团有限公司 | Thermal insulation method of silica brick hot blast stove |
| CN108004358A (en) * | 2017-12-27 | 2018-05-08 | 中冶京诚工程技术有限公司 | Control System of Airheater |
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