CN113088605B - Reverse air supply device and heat preservation method for braising stove of hot blast stove - Google Patents
Reverse air supply device and heat preservation method for braising stove of hot blast stove Download PDFInfo
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- CN113088605B CN113088605B CN202110395999.4A CN202110395999A CN113088605B CN 113088605 B CN113088605 B CN 113088605B CN 202110395999 A CN202110395999 A CN 202110395999A CN 113088605 B CN113088605 B CN 113088605B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B9/00—Stoves for heating the blast in blast furnaces
- C21B9/10—Other details, e.g. blast mains
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B9/00—Stoves for heating the blast in blast furnaces
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Abstract
The invention belongs to the technical field of blast furnace smelting, and particularly relates to an inverse air supply device and a smoldering furnace heat preservation method of a hot blast furnace. The two ends of the delivery pipe are opened, one end of the delivery pipe is detachably connected with an exhaust manhole of the hot blast stove, and a blind plate is arranged between the delivery pipe and the exhaust manhole and used for opening and closing the communication part; the water spraying pipe is arranged above the delivery pipe and used for providing water spraying for cooling; the support frame is used for supporting the delivery pipe, the delivery pipe is connected with the support frame in a sliding manner, and the plurality of support frames are arranged along the axial direction of the delivery pipe; the flexible adjusting chains penetrate through the fixed points, two ends of the flexible adjusting chains are detachably connected with the delivery pipe, and the flexible adjusting chains are arranged along the axial direction of the delivery pipe; the counter-blowing device can safely and efficiently discharge hot air for a long time, is simple and convenient to install, has a good cooling effect and a long service life, and does not have potential safety hazards of failure. The method for keeping the temperature of the braising furnace of the hot blast stove can increase the heat storage capacity, reduce the heat loss, prolong the heat preservation time of the braising furnace and greatly reduce the temperature reduction times of the counter-blowing.
Description
Technical Field
The invention relates to the technical field of blast furnace smelting, in particular to a reverse air supply device and a smoldering furnace heat preservation method of a hot blast furnace.
Background
When the conventional silica brick hot-blast stove cannot normally supply air during the maintenance of a blast furnace, the heat of the smoldering furnace is required to be preserved so as to protect the temperature of the silica bricks from being maintained at the upper limit of the safe crystal orientation transformation temperature. The purpose of the reverse air supply is to reduce the temperature of the grate and the support of the hot blast stove as much as possible so as to ensure that the vault temperature of the hot blast stove is heated as much as possible when the temperature of the waste gas is lower than the control standard, thereby achieving the purpose of long-time stewing and heat preservation. Therefore, on the premise of ensuring the temperature of the vault, the longer the heat preservation time of the braising furnace is, the less the times of reverse air supply are. After the conventional furnace is stewed, the heat preservation time is usually only 2 to 3 daysThe air supply and the furnace burning are required to be carried out again, the air supply and the furnace burning are carried out frequently, the operation is repeated, and the effect is poor. The existing conventional reverse air supply cooling air supply outlet is as follows: the hot-blast stove comprises a hot-blast stove body, a hot-blast outlet, a hot-blast valve, hot-blast branch pipes, a hot-blast main pipe (surrounding pipe) and a backflow pipe, wherein when a hot-blast pipeline is maintained, other manholes of the hot-blast stove are required to be selected to discharge hot air, and a delivery pipe is required to be led out from the manholes of the hot-blast stove to a safe position to discharge the hot air in order to prevent equipment around from being burnt and endanger operators during air supply. The process of the reverse air supply is characterized in that hot air exhausted from checker bricks of the regenerator is more than 1000 ℃, the discharge time is 2-24 hours each time, and the period of the reverse air supply is the maintenance period of the blast furnace, and is about 7-60 days; therefore, the safety of the simple welding reel pipe structure cannot meet the long-time safety control requirement. In addition, the connection part of the delivery pipe and the air exhaust manhole of the hot blast stove needs to be fully opened during air supply and sealed during furnace burning, and if a high-temperature butterfly valve is adopted, the high-temperature butterfly valve is difficult to bear the large air volume (the air volume is about 120000 m) during air supply 3 /h, the air pressure is 12 KPa), so that the service life is short; if a high-temperature water-cooling gate valve is used, the equipment cost is high, the field installation condition is limited, and a safe and stable reverse air supply device and a long-time braising furnace heat preservation method are urgently needed for the field.
Disclosure of Invention
The invention aims to provide a reverse air supply device and a stewing and heat preservation method of a hot blast stove, wherein the reverse air supply device can safely and efficiently discharge hot air for a long time, is simple and convenient to install, has a good cooling effect, long service life, low investment and no potential safety hazard of failure; the method for keeping the temperature of the braising furnace of the hot blast stove can increase the heat storage capacity, reduce the heat loss, prolong the heat preservation time of the braising furnace and greatly reduce the temperature reduction times of the counter-blowing.
In order to achieve the purpose, the invention adopts the following technical scheme:
in one aspect, there is provided an inverse air blowing device including:
the two ends of the delivery pipe are provided with openings, one end of the delivery pipe can be detachably connected with an exhaust manhole of the hot blast stove, and a blind plate is arranged at the communication position of the delivery pipe and the exhaust manhole of the hot blast stove and used for opening and closing the communication position; the delivery pipe is configured to discharge hot air inside the hot blast stove;
the water spraying pipe is arranged above the guide pipe and used for providing water spraying cooling for the guide pipe;
a plurality of support brackets configured to support the delivery tube, the delivery tube being slidably coupled to the support brackets, the plurality of support brackets being disposed along an axial direction of the delivery tube; and
a plurality of flexible adjustment chains, flexible adjustment chain can wear to establish and install at the fixed point, and both ends can dismantle connect in on the contact tube, it is a plurality of flexible adjustment chain is followed the axial setting of contact tube.
As a preferred structure of the present invention, the supporting frame further includes a pulley, the pulley is fixedly connected to the top of the supporting frame, and the pulley is slidably connected to the delivery pipe.
As a preferable structure of the invention, the hot blast stove further comprises an air supply pipe, the air supply pipe is fixedly connected with one end, far away from the air exhaust manhole of the hot blast stove, of the delivery pipe, the air supply pipe is in a trumpet shape, and an included angle is formed between the axial direction of the air supply pipe and the axial direction of the delivery pipe.
As a preferable structure of the present invention, an axial included angle between the axial direction of the blast pipe and the axial direction of the delivery pipe is 30 ° to 50 °, and an opening of the blast pipe is upward.
As a preferable structure of the present invention, the delivery pipe further includes a heat-resistant and refractory material layer, and the heat-resistant and refractory material layer is disposed on the inner pipe wall of the delivery pipe.
In a preferred structure of the present invention, the delivery tube further includes a plurality of anchors, the anchors are uniformly spaced on the inner wall of the delivery tube, and the anchors are configured to anchor the heat-resistant and refractory material layer.
As a preferable structure of the present invention, the thickness of the heat-resistant and heat-resistant material layer is 25mm to 30mm; the height of the anchoring piece is 20 mm-25 mm.
As a preferred structure of the present invention, the delivery pipe further comprises a connection flange configured to connect with the hot blast stove exhaust manhole; one side of the blind plate is connected with the connecting flange in an abutting mode, and the other side of the blind plate is connected with the air exhaust manhole of the hot blast stove in an abutting mode.
As a preferable structure of the present invention, the present invention further includes a water collecting device including:
the water spraying collecting tank is arranged on the other side, away from the water spraying pipe, of the guide pipe and is configured to collect water sprayed by the water spraying pipe;
the drain pipe is fixedly connected with the water spraying collecting tank and is configured to drain accumulated water in the water spraying collecting tank.
On the other hand, the method for keeping the temperature of the stewing furnace of the hot blast stove is used for cooling the hot blast stove by using the inverse air supply device and comprises the following steps:
s1, checking and confirming the air tightness of a hot blast stove body and a valve, wherein the valve comprises a gas combustion valve and/or an air combustion valve and/or a flue valve and/or a pressure discharge valve and/or a stamping valve and/or a regulating valve;
s2, burning the blast furnace by using a hot blast furnace, wherein the burning gas quantity of the 3200 cubic blast furnace is 200000 cubic/hour, and the air-fuel ratio is 1.1; the gas quantity of a 2500 cubic blast furnace is 160000 cubic/hour, and the air-fuel ratio is 0.8; the gas quantity of a burning furnace of the 1050 cubic blast furnace is 56000 cubic/hour, and the air-fuel ratio is 0.65;
s3, opening the blind plate, communicating the air exhaust manhole and the delivery pipe of the hot blast stove, opening a water spraying pipe, and executing the inverse air supply cooling operation of the hot blast stove;
and S4, after the hot blast stove is cooled, closing the blind plate and closing the water spraying pipe.
The invention has the beneficial effects that: according to the air supply reversing device, the blind plate is arranged between the guide pipe and the air exhaust manhole of the hot blast stove, so that the guide pipe and the air exhaust manhole of the hot blast stove can be conveniently communicated and blocked, the requirements of full opening of the guide pipe during air supply reversing and sealing of the guide pipe during furnace burning are met, hot air can be safely and efficiently discharged for a long time, the use is convenient, and the potential safety hazard of failure is avoided; the water spraying pipe provides water spraying for cooling, so that the cooling effect of the inverse air supply device is accelerated, the delivery pipe is durable, the service life is long, and the investment is low; the delivery pipe is connected with the support frame in a sliding way, and an inverted flexible adjusting chain is arranged for adjusting the distance of the delivery pipe relative to an exhaust manhole of the hot blast stove in the axial direction, so that the installation is convenient; the stewing heat preservation method of the hot blast stove optimizes the burning method, can increase the heat storage capacity, reduce the heat loss, prolong the stewing heat preservation time, greatly reduce the temperature reduction times of the reverse air supply, strengthen the temperature reduction effect through the double temperature reduction measures of the heat-resistant material layer of the guide pipe and the water spraying pipe, and prolong the service life.
Drawings
Fig. 1 is a schematic structural diagram of an inverse blowing device according to a first embodiment of the present invention;
fig. 2 is a sectional view of a delivery tube according to an embodiment of the present invention.
In the figure:
1. a delivery pipe; 11. a heat-resistant and material-resistant layer; 12. anchoring the member; 13. a connecting flange; 2. a water spraying pipe; 3. a support frame; 31. a pulley; 4. a flexible adjustment chain; 5. a blind plate; 6. an air supply pipe; 71. a water spraying collecting tank; 72. a drain pipe;
100. air exhaust manhole of hot blast stove.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless expressly stated or limited otherwise, the recitation of a first feature "on" or "under" a second feature may include the recitation of the first and second features being in direct contact, and may also include the recitation that the first and second features are not in direct contact, but are in contact via another feature between them. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. "beneath," "under" and "beneath" a first feature includes the first feature being directly beneath and obliquely beneath the second feature, or simply indicating that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used based on the orientations and positional relationships shown in the drawings, and are only for convenience of description and simplicity of operation, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
Example one
As shown in fig. 1 and 2, an embodiment of the present invention provides an inverse air blowing device, which includes a delivery pipe 1, a water spraying pipe 2, a plurality of support frames 3, and a plurality of flexible adjustment chains 4. Two ends of the delivery pipe 1 are opened, one end of the delivery pipe 1 is detachably connected with an air exhaust manhole 100 of the hot blast stove, a blind plate 5 is arranged between the delivery pipe 1 and the air exhaust manhole 100 of the hot blast stove, and the blind plate 5 is used for opening and closing a communication part; the delivery pipe 1 is configured to discharge hot air inside the hot blast stove. The water spraying pipe 2 is arranged above the guide pipe 1, and the water spraying pipe 2 is used for providing water spraying cooling for the guide pipe 1. The water spraying pipe 2 is used for cooling water, so that the cooling effect of the inverse air supply device is improved, and the delivery pipe 1 is durable. Preferably, the trickle 2 is on a parallel with contact tube 1, and trickle 2 has a plurality of apopores, and a plurality of apopores evenly set up along the axial interval of trickle 2, are convenient for carry out the trickle cooling to contact tube 1 evenly. The support frame 3 is configured to support the delivery tube 1, the delivery tube 1 is slidably connected to the support frame 3, and the plurality of support frames 3 are arranged along the axial direction of the delivery tube 1, so that the distance of the delivery tube 1 relative to the exhaust manhole 100 of the hot blast stove can be adjusted in the axial direction. The flexible adjusting chains 4 can be arranged at fixed points in a penetrating way, and the two ends of the flexible adjusting chains can be detachably connected to the guide pipe 1, and the flexible adjusting chains 4 are arranged along the axial direction of the guide pipe 1. Preferably, the fixed point sets up in the top of contact tube 1, can conveniently adjust the position of contact tube 1 through the flexible adjustment chain 4 of flip-chip for contact tube 1 can slide in a flexible way on support frame 3, and the one end opening of the contact tube 1 of being convenient for aligns simple to operate with hot-blast furnace exhaust manhole 100. The flexible adjusting chain 4 can be an iron ring chain, which is a common device in the industry, and the specific structure and material thereof are not described in detail in this embodiment. The blind plate 5 can be assembled and disassembled between the delivery tube 1 and the air exhaust manhole 100 of the hot blast stove, so that the communication and the plugging between the delivery tube 1 and the air exhaust manhole 100 of the hot blast stove are convenient to realize, the requirements of full opening of the delivery tube 1 during inverse air supply and sealing of the delivery tube 1 during stove burning are met, hot air can be safely and efficiently discharged for a long time, the use is convenient, and no failure potential safety hazard exists; long service life and less investment.
Further, the support frame 3 further comprises a pulley 31, the pulley 31 is fixedly connected to the top of the support frame 3, and the pulley 31 is slidably connected with the delivery pipe 1. The pulley 31 is convenient for adjusting the distance between the delivery pipe 1 and the hot blast stove exhaust manhole 100 in the axial direction, and the movement on the support frame 3 is smoother.
Further, the blast pipe 6 is fixedly connected with one end of the delivery pipe 1 far away from the hot blast stove exhaust manhole 100, the blast pipe 6 is trumpet-shaped, and an included angle is formed between the axial direction of the blast pipe 6 and the axial direction of the delivery pipe 1. Preferably, the axial included angle between the axial direction of the blast pipe 6 and the axial direction of the delivery pipe 1 is 30-50 degrees, and the opening of the blast pipe 6 faces upwards. The air supply pipe 6 can reduce noise generated by air supply and avoid harming surrounding equipment and operators when hot air is discharged.
Further, the delivery tube 1 further comprises a heat-resistant and resistant material layer 11 and a plurality of anchoring members 12, the heat-resistant and resistant material layer 11 is disposed on the inner wall of the delivery tube 1, the anchoring members 12 are uniformly disposed on the inner wall of the delivery tube 1 at intervals, and the anchoring members 12 are configured to anchor the heat-resistant and resistant material layer 11, so that the heat-resistant and resistant material layer 11 is not easy to fall off. The heat-resistant and material-resistant layer 11 can increase the high-temperature hot-air resistance of the delivery pipe 1. Preferably, the anchoring pieces 12 are uniformly welded on the inner wall of the delivery pipe 1 at intervals of 50 mm-60 mm along the axial direction, and the anchoring pieces 12 are uniformly distributed on the radial circumference of the inner wall of the delivery pipe 1; the height of the anchoring piece 12 is 20 mm-25 mm, and the thickness of the heat-resistant material-resistant layer 11 is 25 mm-30 mm. In the embodiment of the present invention, the high temperature resistance of the heat-resistant and flame-resistant material layer 11 is required to be higher than 1500 ℃.
Further, the delivery pipe 1 further comprises a connecting flange 13, and the connecting flange 13 is configured to be connected with the hot blast stove exhaust manhole 100; one side of the blind plate 5 is connected with the connecting flange 13 in an abutting mode, and the other side of the blind plate is connected with the air exhaust manhole 100 of the hot blast stove in an abutting mode. Preferably, the connecting flange 13 is connected with the hot blast stove exhaust manhole 100 through 6-8 bolts; when the reverse feeding and cooling needs to be carried out, the bolts are loosened, the blind plates 5 are taken out, the bolts are screwed down to seal the delivery pipe 1 and the air exhaust manhole 100 of the hot blast stove, and the operation is simple and labor-saving.
Further, the counter-blowing device further comprises a water collecting device, and the water collecting device comprises a water spraying collecting tank 71 and a water discharging pipe 72. The water spraying collecting tank 71 is arranged on the other side of the delivery pipe 1 far away from the water spraying pipe 2, and the water spraying collecting tank 71 is configured to collect the water spraying of the water spraying pipe 2; a drain pipe 72 is fixedly connected to the shower water collecting tank 71, and the drain pipe 72 is configured to drain accumulated water in the shower water collecting tank 71.
Example two
The embodiment of the invention provides a stewing heat preservation method for a hot blast stove, which is used for cooling the hot blast stove by using a reverse air supply device in the first embodiment and comprises the following steps:
s1, confirming the air tightness of a hot blast stove body and a valve, wherein the valve comprises a gas combustion valve and/or an air combustion valve and/or a flue valve and/or a pressure discharge valve and/or a punching valve and/or an adjusting valve, and reducing the heat loss in the hot blast stove through air tightness check;
because the gas combustion valve, the air combustion valve, the flue valve, the pressure discharge valve and the stamping valve are communicated with external media, the heat loss can be reduced by strengthening the air tightness of the inside of the hot blast stove body and related valves; by adjusting the valve in-place signal, the sealing performance of the adjusting valve is ensured to reach a good state when the adjusting valve is closed in place, the air blow-by rate is reduced, and the heat loss in the hot blast stove is reduced. Under the state that the hot blast stove is not burned and braised, if the condition that the flue valve and the pressure exhaust valve leak air loosely is existed, the air, the coal gas, the bypass valve of the smoke preheater and the pressure exhaust main valve are closed completely, thereby reducing the temperature reduction of the hot blast stove due to the air leakage and the air acceleration of the valve under the action of the draft force of the chimney.
S2, burning a hot blast stove, wherein the burning gas quantity of a 3200-cube blast furnace is 200000 cube/hour, and the air-fuel ratio is 1.1; the gas quantity of a 2500 cubic blast furnace is 160000 cubic/hour, and the air-fuel ratio is 0.8; the gas quantity of a burning furnace of the 1050 cubic blast furnace is 56000 cubic/hour, and the air-fuel ratio is 0.65;
by the optimized furnace burning method, the heat storage capacity is improved, the soaking time is prolonged, and for other blast furnaces with different volumes, the gas quantity of the furnace is controlled to be 50-60% of the normal furnace burning quantity, and the air-fuel ratio is reduced by 0.03-0.08 compared with the normal value; by reducing the amount of gas and the air-fuel ratio of the furnace, the flue gas generation amount in unit time is reduced, the rising rate of the exhaust gas temperature of the grate and the support is reduced (the grate and the support are communicated with a chimney through a flue pipeline and a valve and have a cooling effect under the action of chimney draft), the furnace burning time of the hot blast furnace is prolonged under the conditions that the exhaust gas temperature control standard is unchanged and the heat storage performance of the checker bricks of the regenerator is unchanged, and the heat absorption efficiency and the heat storage amount of the checker bricks of the regenerator are improved. The burning time can be prolonged to 3-4 times of that of a common burning furnace, and the heat preservation time of the braising furnace reaches more than 6 days. The vault temperature is based on the vault couple display temperature during burning, the silica brick interface couple display temperature is used as the main point during the heat preservation of the stewing furnace of the silica brick hot blast furnace, and the vault couple display temperature is used as the reference point.
S3, opening a blind plate 5, communicating an exhaust manhole 100 and a delivery pipe 1 of the hot blast stove, opening a water spraying pipe 2, and executing the inverse air supply cooling operation of the hot blast stove;
in this step, loosen the bolt of flange 13 and take out blind plate 5, tighten the bolt again and realize the sealed of delivery tube 1 and hot-blast furnace manhole 100 that airs exhaust, at this moment, delivery tube 1 intercommunication hot-blast furnace manhole 100 that airs exhaust can carry out hot-blast transport, open the trickle 2 and can carry out the trickle cooling.
S4, finishing the cooling of the hot blast stove, finishing the operation of cooling by inverse blowing, installing a blind plate 5 between an exhaust manhole 100 and a delivery pipe 1 of the hot blast stove, and closing a water spraying pipe 2;
in the step, the bolts of the connecting flange 13 are loosened, the blind plate 5 is installed, the bolts are screwed down to realize the fixed connection of the guide pipe 1 and the exhaust manhole 100 of the hot blast stove, at the moment, the guide pipe 1 is separated from the exhaust manhole 100 communicated with the hot blast stove, the water spraying pipe 2 is closed, and the operation of cooling by counter blowing is finished. And when the hot blast stove needs to be fired again, repeating the step S2 to the step S4.
Further, before step S3, a delivery pipe 1 is manufactured, and an inverse blowing device is installed. Preferably, the length of the delivery pipe 1 is determined according to the actual requirements on the site, the peripheral equipment and operators cannot be damaged when air supply is required, the inner diameter of the delivery pipe 1 is consistent with that of the air exhaust manhole 100 of the hot blast stove, and the sealing performance is good.
According to the method for preserving the heat of the hot blast stove in the embodiment of the invention, the heat loss of the hot blast stove is reduced, the stove burning method is optimized, the heat storage capacity is increased, the purpose of prolonging the heat preservation time of the stove is achieved, the heat preservation time of the stove can be longer than 6 days, and the frequency of reverse air supply is greatly reduced; the cooling effect is enhanced through the double cooling measures of the heat-resistant and material-resistant layer 11 of the delivery pipe 1 and the water spraying pipe 2, and the service life is prolonged; the structure of inserting the blind plate 5 between the air exhaust manhole 100 and the delivery pipe 1 of the hot blast stove can safely and reliably realize inverse air supply, does not harm surrounding equipment and personnel, and has low investment. The method of the embodiment of the invention can be popularized and used in the iron-making industry to meet the requirements of heat preservation of the annealing furnace and temperature reduction of the counter-blowing air of large, medium and small blast furnace hot blast furnaces.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (8)
1. An inverse air blowing device, comprising:
the hot blast stove comprises a delivery pipe (1), wherein two ends of the delivery pipe (1) are opened, one end of the delivery pipe (1) can be detachably connected with a hot blast stove exhaust manhole (100), and a blind plate (5) is arranged at the communication position of the delivery pipe (1) and the hot blast stove exhaust manhole (100) and used for opening and closing the communication position; the delivery pipe (1) is configured to discharge hot air inside the hot blast stove;
the water spraying pipe (2) is arranged above the guide pipe (1), and the water spraying pipe (2) is used for providing water spraying cooling for the guide pipe (1);
a plurality of support frames (3), wherein the support frames (3) are configured to support the delivery pipe (1), the delivery pipe (1) is slidably connected with the support frames (3), and the plurality of support frames (3) are arranged along the axial direction of the delivery pipe (1);
the flexible adjusting chains (4) can be arranged at fixed points in a penetrating manner, two ends of each flexible adjusting chain (4) are detachably connected to the delivery pipe (1), and the flexible adjusting chains (4) are arranged along the axial direction of the delivery pipe (1);
the air supply pipe (6) is fixedly connected with one end, far away from the hot blast stove exhaust manhole (100), of the guide pipe (1), the air supply pipe (6) is horn-shaped, and an included angle is formed between the axial direction of the air supply pipe (6) and the axial direction of the guide pipe (1);
a water collection device, the water collection device comprising:
a water spraying collecting tank (71), wherein the water spraying collecting tank (71) is arranged on the other side of the guide pipe (1) far away from the water spraying pipe (2), and the water spraying collecting tank (71) is configured to collect water sprayed from the water spraying pipe (2);
a drain pipe (72), the drain pipe (72) being fixedly connected to the water spray collection tank (71), the drain pipe (72) being configured to drain accumulated water within the water spray collection tank (71).
2. The apparatus of claim 1, wherein the support frame (3) further comprises a pulley (31), the pulley (31) is fixedly connected to the top of the support frame (3), and the pulley (31) is slidably connected to the delivery pipe (1).
3. The upwind device according to claim 1, characterized in that the axial included angle between the axial direction of the blast pipe (6) and the axial direction of the delivery pipe (1) is 30-50 degrees, and the opening of the blast pipe (6) is upward.
4. The headwind arrangement according to claim 1, wherein the delivery tube (1) further comprises a heat resistant and resistant material layer (11), the heat resistant and resistant material layer (11) being arranged to the inner tube wall of the delivery tube (1).
5. The overfire air supply apparatus according to claim 4, wherein the delivery tube (1) further comprises a plurality of anchoring members (12), the plurality of anchoring members (12) being arranged at regular intervals on the inner tube wall of the delivery tube (1), the anchoring members (12) being configured to anchor the heat-resistant and material-resistant layer (11).
6. The headwind device according to claim 5, wherein the thickness of the heat and resistance material layer (11) is 25mm to 30mm; the height of the anchoring piece (12) is 20 mm-25 mm.
7. The upwind arrangement according to claim 1, characterized in that the delivery tube (1) further comprises a connection flange (13), the connection flange (13) being configured to connect to the hot blast stove exhaust manhole (100); one side of the blind plate (5) is connected with the connecting flange (13) in an abutting mode, and the other side of the blind plate is connected with the hot blast stove exhaust manhole (100) in an abutting mode.
8. A method for keeping the temperature of a hot blast stove during braising, which uses the inverse blowing device of any one of claims 1 to 7 to cool the hot blast stove, and is characterized by comprising the following steps:
s1, checking and confirming the air tightness of a hot blast stove body and a valve, wherein the valve comprises a gas combustion valve and/or an air combustion valve and/or a flue valve and/or a pressure discharge valve and/or a stamping valve and/or a regulating valve;
s2, burning a hot blast stove, wherein the burning gas quantity of a 3200-cube blast furnace is 200000 cube/hour, and the air-fuel ratio is 1.1; the gas quantity of a 2500 cubic blast furnace is 160000 cubic/hour, and the air-fuel ratio is 0.8; the gas quantity of a burning furnace of the 1050 cubic blast furnace is 56000 cubic/hour, and the air-fuel ratio is 0.65;
s3, opening the blind plate (5), communicating the air exhaust manhole (100) of the hot blast stove with the delivery pipe (1), opening the water spraying pipe (2), and executing the inverse air supply cooling operation of the hot blast stove;
and S4, after the hot blast stove is cooled, closing the blind plate (5) and closing the water spraying pipe (2).
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| CN202110395999.4A CN113088605B (en) | 2021-04-13 | 2021-04-13 | Reverse air supply device and heat preservation method for braising stove of hot blast stove |
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