CN211872023U - Cooling system for slowing down damage of local cooling wall of blast furnace hearth - Google Patents
Cooling system for slowing down damage of local cooling wall of blast furnace hearth Download PDFInfo
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- CN211872023U CN211872023U CN202020493527.3U CN202020493527U CN211872023U CN 211872023 U CN211872023 U CN 211872023U CN 202020493527 U CN202020493527 U CN 202020493527U CN 211872023 U CN211872023 U CN 211872023U
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Abstract
The utility model provides a cooling system for slowing down the damage of a local cooling wall of a blast furnace hearth, which comprises an industrial water ring pipe, a soft water supply main pipe, a return water tank and a return water pipe, wherein the soft water supply main pipe, the second water inlet pipe, the fourth section cooling wall and the second water outlet pipe are sequentially communicated to form a first passage for soft water circulation; the industrial water ring pipe, the first section cooling wall, the second section cooling wall, the third section cooling wall, the first water outlet pipe, the water return pipe and the water return groove are sequentially communicated to form a second passage for industrial water circulation. The cooling system improves the cooling strength of the first section cooling wall, the second section cooling wall and the third section cooling wall corresponding to the serious erosion part of the hearth carbon brick, slows down the damage of the local cooling wall of the blast furnace hearth, reduces the maintenance cost, ensures the long-term operation of the blast furnace hearth, and meets the personalized requirement.
Description
Technical Field
The utility model relates to a blast furnace ironmaking metallurgy field, in particular to a cooling system for slowing down the damage of a local cooling wall of a blast furnace hearth.
Background
The blast furnace hearth is the most core part of the blast furnace, the working condition of the hearth basically determines the service life of a first-generation furnace, and the reduction of the damage of the cooling wall of the hearth is beneficial to the improvement of the service life of the blast furnace. The method is characterized in that high-temperature liquid metal molten iron is stored in the middle and the lower part of a hearth, the molten iron is not in a static state but has a circulation phenomenon, the circulated molten iron causes uneven erosion of hearth carbon bricks, so that uneven damage to a hearth cooling wall is caused, the probability of damage to the cooling wall tightly connected with the hearth carbon bricks is higher at the position with serious erosion of the hearth carbon bricks, the cooling strength of the cooling wall tightly connected with the hearth carbon bricks needs to be adjusted according to the erosion degree of the hearth carbon bricks, and the cooling strength of the cooling wall needs to be improved at the position with serious erosion of the carbon bricks.
The cooling strength of local cooling wall of furnace hearth is raised to complement short plate, the high-temp. liquid metal in furnace hearth is also suitable for "barrel effect", if only one cooling wall is damaged, the working condition of furnace hearth is greatly influenced, and even the furnace is stopped and overhauled in advance, and the blast furnace is overhauled in advance, its cost is high, and it is hundreds of millions yuan.
In the prior art, the cooling intensity of the hearth is basically uniform, and the requirement of local individuation cannot be met. There are difficulties in that local carbon brick erosion is severe and the cooling strength of the corresponding stave needs to be improved.
In view of the above, there is a need for a cooling system for a cooling stave of a blast furnace hearth and a method for mitigating local stave breakage to solve the above problems.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a slow down damaged cooling system of blast furnace hearth local cooling wall. The cooling system of the cooling system blast furnace is changed into a cooling mode of soft water and industrial water for cooling the cooling wall, the cooling efficiency of the blast furnace is obviously improved, the damage of the local cooling wall of the blast furnace hearth is effectively slowed down, and the maintenance cost is reduced.
In order to achieve the above object, the present invention provides the following technical solutions:
a cooling system for slowing down the damage of a local cooling wall of a blast furnace hearth is characterized in that a first section of cooling wall, a second section of cooling wall, a third section of cooling wall and a fourth section of cooling wall are sequentially arranged on a blast furnace from bottom to top, the cooling system comprises an industrial water ring pipe, a soft water supply main pipe, a water return tank and a water return pipe, wherein the first section of cooling wall is communicated with a first water inlet pipe, the third section of cooling wall is communicated with a first water outlet pipe, and the fourth section of cooling wall is communicated with a second water inlet pipe and a second water outlet pipe; the soft water supply main pipe, the second water inlet pipe, the fourth section cooling wall and the second water outlet pipe are sequentially communicated to form a first passage for soft water circulation, and the soft water in the first passage can cool the fourth section cooling wall; the industrial water ring pipe, the first section cooling wall, the second section cooling wall, the third section cooling wall, the first water outlet pipe, the water return pipe and the water return groove are sequentially communicated to form a second passage for industrial water circulation, and industrial water in the second passage can cool the first section cooling wall, the second section cooling wall and the third section cooling wall.
Further, in the cooling system for reducing the damage of the local cooling wall of the blast furnace hearth, the first section of cooling wall is communicated with the second section of cooling wall through the first connecting water pipe, and the second section of cooling wall is communicated with the third section of cooling wall through the second connecting water pipe.
Further, in the cooling system for reducing the damage of the local cooling wall of the blast furnace hearth, the soft water main water supply pipe is also communicated with the first water inlet pipe through a first water supply pipe, a first three-way ball valve and a second three-way ball valve are arranged on the first water supply pipe, the first three-way ball valve is respectively communicated with the soft water main water supply pipe, the second three-way ball valve and the second water supply pipe, the second water supply pipe is communicated with the second water inlet pipe, and the soft water main water supply pipe can be communicated with the second water inlet pipe by adjusting the first three-way ball valve; the second three-way ball valve is respectively communicated with the first three-way ball valve, the industrial water ring pipe and the first water inlet pipe, and the industrial water ring pipe can be communicated with the first water inlet pipe by adjusting the second three-way ball valve.
Furthermore, in the cooling system for slowing down the damage of the local cooling wall of the blast furnace hearth, the industrial water ring pipe is communicated with the second three-way ball valve sequentially through an industrial water supply branch pipe and a third water supply pipe; the industrial water supply system is characterized in that a distributor is arranged between the industrial water supply branch pipe and the third water supply pipe, a first gate valve is arranged at the joint of the industrial water ring pipe and the industrial water supply branch pipe, a plurality of water outlet pipes are arranged on the distributor, a second gate valve is arranged on each water outlet pipe, and the third water supply pipe is communicated with one water outlet pipe of the distributor.
Further, in the above cooling system for reducing the damage of the local cooling wall of the blast furnace hearth, the second water supply pipe is a metal hard pipe, the third water supply pipe is a metal hose, and the water return pipe is a metal hard pipe.
Further, in the cooling system for reducing the damage of the local cooling wall of the blast furnace hearth, the flow Q of the soft water in the first passage is 21t/h, and the flow speed V is 1.75 m/s;
the temperature of the soft water in the first passage before entering the fourth section cooling wall is 39-41 ℃.
Further, in the cooling system for reducing the damage of the local cooling wall of the blast furnace hearth, the flow rate Q of the industrial water in the second passage is 30t/h to 35t/h, and the flow speed V is 2.51m/s to 2.92 m/s.
Further, in the cooling system for alleviating the damage of the local cooling wall of the blast furnace hearth, the temperature of the industrial water in the second passage before entering the first section cooling wall is 24-28 ℃.
Further, in the cooling system for alleviating the damage of the local cooling wall of the blast furnace hearth, the temperature difference delta t of the industrial water in the second passage between the first section cooling wall and the third section cooling wall is 0.2-0.4 ℃.
Furthermore, in the cooling system for slowing down the damage of the local cooling wall of the blast furnace hearth, a drain pipe is connected with the distributor, and a drain valve is arranged on the drain pipe.
The analysis can know, the utility model discloses a slow down damaged cooling system of blast furnace hearth local cooling wall, this cooling system carries out refrigerated first route to the fourth section cooling wall including utilizing the soft water, utilize industrial water to first section cooling wall, second section cooling wall and third section cooling wall carry out refrigerated second route, the first section cooling wall that corresponds with the serious position of hearth carbon brick erosion has been improved, the cooling strength of second section cooling wall and third section cooling wall, it is damaged to have slowed down blast furnace hearth local cooling wall (first section cooling wall, second section cooling wall and third section cooling wall), maintenance cost has been reduced, the long-term operation of blast furnace hearth has been guaranteed, individualized requirement is satisfied.
Drawings
The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. Wherein:
fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Description of reference numerals: 1 a first section of stave; 2 a second section of cooling wall; 3 a third section of cooling wall; 4 a fourth segment stave; 5, an industrial water ring pipe; 6 soft water supply main pipe; 7, returning to the water tank; 8, a water return pipe; 9 a first water inlet pipe; 10 a first connecting water pipe; 11 a second connecting water pipe; 12 a first water outlet pipe; 13 a second water inlet pipe; 14 a second water outlet pipe; 15 a first water supply pipe; 16 a first three-way ball valve; 17 a second three-way ball valve; 18 a second water supply pipe; 19 industrial water supply branch pipes; 20 a third water supply pipe; 21 a dispenser; 22 a first gate valve; 23 a second gate valve; 24 sewage draining pipes; 25 a blowdown valve.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments. Each example is provided by way of explanation of the invention and not limitation of the invention. In fact, it will be apparent to those skilled in the art that modifications and variations can be made in the present invention without departing from the scope or spirit of the invention. For instance, features illustrated or described as part of one embodiment, can be used with another embodiment to yield a still further embodiment. It is therefore intended that the present invention encompass such modifications and variations as fall within the scope of the appended claims and equivalents thereof.
In the description of the present invention, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description of the present invention and do not require that the present invention must be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. The terms "connected", "connected" and "disposed" used in the present invention should be understood in a broad sense, and may be, for example, either fixedly connected or detachably connected; they may be directly connected or indirectly connected through intermediate members, and specific meanings of the above terms will be understood by those skilled in the art as appropriate.
A plurality of cooling walls are arranged between the furnace shell of the blast furnace and the hearth carbon bricks (refractory materials) in the circumferential direction, and are used for cooling the hearth carbon bricks. The plurality of cooling walls sequentially comprise four sections of cooling walls from bottom to top, namely a first section of cooling wall 1, a second section of cooling wall 2, a third section of cooling wall 3 and a fourth section of cooling wall 4. Each cooling wall is connected by a plurality of cooling walls at the same elevation, four cooling water pipes are usually arranged in each cooling wall, and each cooling water pipe respectively passes through a first section of cooling wall 1 (one cooling wall), a second section of cooling wall 2 (one cooling wall), a third section of cooling wall 3 (one cooling wall) and a fourth section of cooling wall 4 (one cooling wall) in sequence.
In the prior art, the cooling water of the first, second, third and fourth stages of staves 1, 2, 3 and 4 is cooled by soft water (water from which calcium and magnesium ions are removed), and the cooling structure is as follows: a third connecting water pipe (not shown in the figure) is arranged between the third section cooling wall 3 and the fourth section cooling wall 4, and the soft water supply main pipe 6, the first water supply pipe 15, the first water inlet pipe 9, the first section cooling wall 1, the first connecting water pipe 10, the second section cooling wall 2, the second connecting water pipe 11, the third section cooling wall 3, the third connecting water pipe, the fourth section cooling wall 4 and the second water outlet pipe 14 are sequentially communicated to form a soft water passage for soft water circulation. Cooling condition of the soft water passage: in a single cooling water pipe, the flow rate Q of soft water is 21t/h, the flow speed V is 1.75m/s, if four identical cooling water pipes are arranged according to a cooling wall, the total flow rate of water flowing through one cooling wall is 21 multiplied by 4 which is 48t/h, and the flow speed V is 1.75 m/s; the temperature of the soft water in the soft water passage before entering the first cooling stave 1 is 39-41 ℃, and the water temperature difference delta t of the soft water between the first cooling stave 1 and the fourth cooling stave 4 is 0.3-0.7 ℃.
The technical scheme of the utility model cooling structure among the prior art is reformed transform, takes the coexistent mode of industrial water and soft water to cool off at the furnace hearth part, and industrial water usually indicates not passing through the water of pharmaceutical processing, just simply filters impurity through the filter screen, and the soft water is with industrial water through pharmaceutical processing, reduces calcium, the magnesium cation of industrial water to certain concentration. For the blast furnace cooling wall, the industrial water has the advantages of high pressure (the water pressure can reach 1.2Mpa, and the soft water pressure is usually only 0.8Mpa), high flow (or called as fast flow rate, because the pipe diameter of a water pipe in the cooling wall of the same blast furnace is unchanged) and low water temperature, so that the industrial water has a good cooling effect compared with the soft water. Soft water is circulated in the blast furnace cooling system in a closed manner, so that fresh water supplement is greatly saved compared with industrial water. At one generation of campaign entering final stage, the hearth carbon brick receives the erosion of different degrees, refractory material (hearth carbon brick) temperature is high, the hearth carbon brick erodees seriously, if not reinforceed the cooling, the hearth carbon brick is eroded totally, the molten iron directly contacts with the cooling wall, very easily causes the hearth to burn through, consequently at the position that the hearth carbon brick temperature risees unusually, need reform transform the cooling wall rather than corresponding, the mode of adopting industrial water at its cooling wall that closely links to each other cools off.
For the same cooling wall, four identical cooling water pipes are usually arranged in the inner part, only one of the cooling water pipes is studied, and the cooling system is described by taking a cooling water pipe needing to be modified as an example. As shown in fig. 1, according to an embodiment of the present invention, a cooling system for reducing the damage of a local cooling wall of a blast furnace hearth is provided.
The technical scheme of the utility model cooling structure among the prior art is reformed transform, takes the coexistent mode of industrial water and soft water to cool off at the furnace hearth part, and in one generation campaign entering last stage, the furnace hearth carbon brick receives the erosion of different degree, at the carbon brick position that the thermocouple temperature that inserts the carbon brick risees unusually, takes the industrial water cooling at its stave that closely links to each other. The parts which are seriously corroded by molten iron circumfluence, harmful elements and the like are usually positioned at the middle part and the lower part of the hearth, and the cooling walls which are tightly connected with the furnace hearth are a first section cooling wall 1, a second section cooling wall 2 and a third section cooling wall 3. Therefore, the parts of the first section cooling wall 1, the second section cooling wall 2 and the third section cooling wall 3 are subjected to industrial water intensive cooling, and the fourth section cooling wall 4 is cooled by soft water.
The cooling system comprises an industrial water ring pipe 5, a soft water supply main pipe 6, a water return tank 7 and a water return pipe 8, wherein a first section cooling wall 1 is communicated with a first water inlet pipe 9, the first water inlet pipe 9 is arranged at a position close to the lower end of the first section cooling wall 1, the first section cooling wall 1 is communicated with a second section cooling wall 2 through a first connecting water pipe 10, the first connecting water pipe 10 is communicated with the upper end of the first section cooling wall 1 and the lower end of the second section cooling wall 2, the second section cooling wall 2 is communicated with the third section cooling wall 3 through a second connecting water pipe 11, the second connecting water pipe 11 is communicated with the upper end of the second section cooling wall 2 and the lower end of the third section cooling wall 3, the third section cooling wall 3 is communicated with a first water outlet pipe 12, the first water outlet pipe 12 is arranged at a position close to the upper end of the third section cooling wall 3, the fourth section cooling wall 4 is communicated with a second water inlet pipe 13 and a second water outlet pipe, a second water inlet pipe 13 is arranged near the lower end of the fourth segment stave 4 and a second water outlet pipe 14 is arranged near the upper end of the fourth segment stave 4.
The soft water supply main pipe 6, the second water inlet pipe 13, the fourth section cooling wall 4 and the second water outlet pipe 14 are sequentially communicated to form a first passage for soft water circulation, and soft water in the first passage can be cooled by the fourth section cooling wall 4. The cooling of the fourth section cooling wall 4 of the hearth is realized by soft water, and the heat of the carbon bricks is taken out of the furnace through the soft water.
The industrial water ring pipe 5, the first water inlet pipe 9, the first section cooling wall 1, the first connecting water pipe 10, the second section cooling wall 2, the second connecting water pipe 11, the third section cooling wall 3, the first water outlet pipe 12, the water return pipe 8 and the water return groove 7 are sequentially communicated to form a second passage for industrial water circulation, and industrial water in the second passage can cool the first section cooling wall 1, the second section cooling wall 2 and the third section cooling wall 3.
The parts which are seriously corroded by molten iron circumfluence, harmful elements and the like are usually positioned at the middle part and the lower part of the hearth, and the cooling walls which are tightly connected with the furnace hearth are a first section cooling wall 1, a second section cooling wall 2 and a third section cooling wall 3. After the modification, the industrial water only carries out the intensified cooling on the first section cooling wall 1, the second section cooling wall 2 and the third section cooling wall 3 which need the intensified cooling. The first-stage cooling wall 1 (one cooling wall), the second-stage cooling wall 2 (one cooling wall) and the third-stage cooling wall 3 (one cooling wall) which are contacted in sequence are connected in series and hermetically cooled between the cooling walls in the furnace (longitudinally, namely in the height direction). Because the temperature of the refractory materials (hearth carbon bricks) in the furnace is high, the hearth carbon bricks are corroded seriously, if the reinforced cooling is not carried out, the hearth carbon bricks are corroded completely, molten iron is directly contacted with a cooling wall, the hearth is easy to burn through, the corrosion of the furnace carbon bricks is irreversible, the corroded carbon bricks cannot be restored, and once the industrial water is cooled, the industrial water is not changed into the soft water for cooling.
The first section cooling wall 1, the second section cooling wall 2 and the third section cooling wall 3 are cooled intensively by using industrial water, so that the cooling strength is improved, the industrial water brings the heat of carbon bricks out of the furnace, the carbon bricks in the furnace hearth are protected, the erosion degree of the carbon bricks in the furnace hearth is greatly slowed down, the damage of the first section cooling wall 1, the second section cooling wall 2 and the third section cooling wall 3 is further slowed down, and the maintenance cost of the blast furnace is reduced. Since molten iron is mainly concentrated at the position between the first cooling wall section 1 and the third cooling wall section 3 of the hearth, the hearth corresponding to the fourth cooling wall section 4 has almost no molten iron accumulation, and the molten iron has less erosion to the hearth carbon bricks at the position of the fourth cooling wall section 4, the fourth cooling wall section 4 is cooled by soft water. Soft water is circulated in the cooling system in a closed manner, so that the supplement of new water can be saved.
Further, the soft water supply main pipe 6 is also communicated with the first water inlet pipe 9 through a first water supply pipe 15, and a first three-way ball valve 16 and a second three-way ball valve 17 are arranged on the first water supply pipe 15; the first three-way ball valve 16 is respectively communicated with the soft water main pipe 6, the second three-way ball valve 17 and the second water supply pipe 18, the second water supply pipe 18 is communicated with the second water inlet pipe 13, and the soft water main pipe 6 can be communicated with the second water inlet pipe 13 through the second water supply pipe 18 by adjusting the first three-way ball valve 16.
The second three-way ball valve 17 is respectively communicated with the first three-way ball valve 16, the industrial water ring pipe 5 and the first water inlet pipe 9, and the industrial water ring pipe 5 can be communicated with the first water inlet pipe 9 by adjusting the second three-way ball valve 17.
Further, the industrial water ring pipe 5 is communicated with the second three-way ball valve 17 through an industrial water supply branch pipe 19 and a third water supply pipe 20 in sequence; a distributor 21 is arranged between the industrial water supply branch pipe 19 and the third water supply pipe 20, the distributor 21 is similar to a water collecting bag, water guided by the industrial water main pipe 5 passes through the water collecting bag, and a plurality of gate valves (second gate valves 23) are arranged on the water collecting bag, so that the gate valves are prevented from being drilled and installed at a plurality of positions on the water supply main pipe (industrial water ring pipe 5). A first gate valve 22 is provided at the junction of the industrial water loop 5 and the industrial water supply branch pipe 19, and the industrial water can be flowed into the distributor 21 from the industrial water loop 5 by opening the first gate valve 22. The distributor 21 is provided with a plurality of water outlet pipes, each water outlet pipe is provided with a second gate valve 23, the third water supply pipe 20 is communicated with one water outlet pipe of the distributor 21, and the industrial water entering the distributor 21 can be conveyed to the second three-way ball valve 17 by opening the second gate valve 23 on the water outlet pipe; other water outlet pipes on the distributor 21 are used to deliver industrial water to other cooling water pipes in the current stave or to other stave cooling water pipes requiring intensive cooling. The distributor 21 can avoid drilling holes at multiple positions on the industrial water ring pipe 5 to install gate valves, and is convenient for installing system pipelines.
Three staves of the first stave segment 1 (one stave), the second stave segment 2 (one stave) and the third stave segment 3 (one stave) may be referred to as a cluster of staves. The function of the second gate valves 23 on the distributor 21 (or called the water collection bag) is the same. When the connection between the distributor 21 and the staves is completed, the gate valves are opened, because one gate valve on the distributor only manages one set of staves (the first stave segment 1 (one stave), the second stave segment 2 (one stave) and the third stave segment 3 (one stave) which are contacted from bottom to top in sequence), in fact, there may be multiple sets of staves that need intensive cooling, and therefore, there are multiple gate valves on the distributor. The second gate valve 23 serves to ensure that the industrial water path is cut off before the installation of the pipes and valves.
Further, the second water supply pipe 18 is a metal pipe, the third water supply pipe 20 is a metal hose, and the return pipe 8 is a metal pipe. Since the distributor 21 is located close to the industrial water loop 5 and away from the second three-way ball valve 17, the third water supply pipe 20 can be easily connected to the distributor 21 and the second three-way ball valve 17 by using a metal hose, and the reliability of the cooling system can be improved by using a metal hard pipe for the second water supply pipe 18 and the return pipe 8.
Further, the flow rate Q (single cooling water pipe) of the industrial water in the second passage is 30t/h to 35t/h (such as 30t/h, 31t/h, 32t/h, 33t/h, 34t/h and 35t/h), preferably 30t/h, and the flow velocity V of the industrial water in the second passage is 2.51m/s to 2.92m/s (such as 2.51m/s, 2.53m/s, 2.55m/s, 2.57m/s, 2.61m/s, 2.63m/s, 2.65m/s, 2.67m/s, 2.71m/s, 2.73m/s, 2.75m/s, 2.77m/s, 2.81m/s, 2.83m/s, 2.85m/s, 2.87m/s and 2.92m/s), preferably 2.51 m/s. According to different corrosion severity of refractory materials in the furnace, the flow rate of industrial water can be adjusted by adjusting the rotating speed of the industrial water supply motor, so that the cooling strength for cooling the first section cooling wall 1, the second section cooling wall 2 and the third section cooling wall 3 is met.
Further, the temperature of the industrial water in the second path before entering the first stage stave cooler 1 is 24 to 28 ℃ (e.g., 24 ℃, 24.5 ℃, 25 ℃, 25.5 ℃, 26 ℃, 26.5 ℃, 27 ℃, 27.5 ℃, 28 ℃). The temperature of the industrial water before entering the first section cooling wall 1 is lower than that of the soft water before modification when entering the first section cooling wall 1 (the temperature of the soft water before modification when entering the first section cooling wall 1 is 39-41 ℃), so that the cooling strength is improved, and the damage of the local cooling wall of the blast furnace hearth is further reduced.
Further, the temperature difference Δ t of the industrial water in the second path between the first stage stave 1 and the third stage stave 3 is 0.2 ℃ to 0.4 ℃ (e.g., 0.2 ℃, 0.22 ℃, 0.24 ℃, 0.26 ℃, 0.28 ℃, 0.3 ℃, 0.32 ℃, 0.34 ℃, 0.36 ℃, 0.38 ℃, 0.4 ℃). The lower the water temperature difference between the first-stage stave 1 to the third-stage stave 3 in the second pass, the better the cooling effect on the refractory material in the corresponding furnace, and the more favorable the protection of the refractory material. The refractory material is in a dangerous state when the water temperature difference between the first section cooling wall 1 and the third section cooling wall 3 exceeds more than 0.8 ℃, so that the refractory material can be ensured to be in a relatively safe state when the water temperature difference between the first section cooling wall 1 and the third section cooling wall 3 of the industrial water in the second passage is 0.2-0.4 ℃.
Further, a drain pipe 24 is connected to the distributor 21, and a drain valve 25 is provided on the drain pipe 24. The control blow-off valve 25 can discharge the industrial water in the system through the blow-off pipe 24, when the system is overhauled, the industrial water in the system is firstly discharged by the blow-off pipe, and then the system is overhauled.
Further, the flow Q of the soft water in the first passage is 21t/h, and the flow speed V is 1.75 m/s; the temperature of the soft water in the first passage before entering the fourth stage stave cooler is 39 to 41 ℃ (e.g., 39 ℃, 39.2 ℃, 39.4 ℃, 39.6 ℃, 39.8 ℃, 40 ℃, 40.2 ℃, 40.4 ℃, 40.6 ℃, 40.8 ℃ and 41 ℃).
Example 1
For a certain 1780m3The cooling structure of the blast furnace is reformed, which comprises the following steps:
1) preparing materials: a dispenser 21 having a length of 400mm and a width of 325 mm); a first gate valve 22, specification DN200 mm; a second gate valve 23, specification DN65 mm; blowdown valve 26, specification DN50 mm; a first three-way ball valve 16 and a second three-way ball valve 17, wherein the specification is DN65 mm; the specification of the metal hose (the third water supply pipe 20) is DN65mm, and the length is 4 meters; seamless steel pipes (second water supply pipe 18 and return pipe 8) phi 76 x 6mm, length 120m, return tank 7, etc.
2) In the state of non-stop, the industrial water loop pipe 5, the first gate valve 22, the industrial water supply branch pipe 19, the distributor 21, the second gate valve 23, and the third water supply pipe 20 are connected in sequence.
3) The short-term blowing down and production stopping of the blast furnace are arranged, a water pump for pumping soft water is shut down, the first water supply pipe 15 is cut off rapidly, the second three-way ball valve 17 is installed, an external connecting pipe (a third connecting water pipe) between the third section cooling wall 3 and the fourth section cooling wall 4 is disconnected, the first three-way ball valve 16 is adjusted, the first three-way ball valve 16 is communicated with the second water inlet pipe 13 through the second water supply pipe 18, the first water outlet pipe 12 is communicated with the water return groove 7 through the water return pipe 8, the third water supply pipe 20 is connected with the second three-way ball valve 17, the second three-way ball valve 17 is adjusted to communicate the third water supply pipe 20 with the first water inlet pipe 9, the water pump is started to pump the soft water into the first passage, the first gate valve 22 and the second gate valve 23 are opened in sequence to convey the industrial water into the second passage, and the.
As shown in fig. 1, in this embodiment, after removing the third connecting water pipe between the third-stage stave 3 and the fourth-stage stave 4 and modifying the original cooling structure, the soft water moves in the direction of (first path): the soft water supply main pipe 6 → the first water supply pipe 15 → the first three-way ball valve 16 → the second water supply pipe 18 → the second water inlet pipe 13 → the fourth stage stave 4 → the second water outlet pipe 14.
The industrial water runs (second path): the industrial water collar 5 → the first gate valve 22 → the industrial water supply branch pipe 19 → the distributor 21 → the second gate valve 23 → the third water supply pipe 20 → the second three-way ball valve 17 → the first water supply pipe 15 → the first water inlet pipe 9 → the first stave 1 → the first connecting water pipe 10 → the second stave 2 → the second connecting water pipe 11 → the third stave 3 → the first water outlet pipe 12 → the water return pipe 8 → the water return tank 7.
In the embodiment, the cooling system of the blast furnace is changed from a mode of soft water cooling to a mode of soft water and industrial water coexisting to cool the cooling wall, the cooling efficiency of the blast furnace is obviously improved, and the cooling wall of the blast furnace is zero damaged in 9 years of production.
From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects:
the utility model provides a slow down damaged cooling system of blast furnace hearth local cooling wall, this cooling system utilizes soft water to cool off fourth section stave 4, utilize industrial water to cool off first section stave 1, second section stave 2 and third section stave 3, the first section stave 1 that corresponds with the serious position of hearth carbon brick erosion has been improved, the cooling strength of second section stave 2 and third section stave 3, the damage of blast furnace hearth local cooling wall has been slowed down, maintenance cost is reduced, the long-term operation of blast furnace hearth has been guaranteed, individualized requirement is satisfied.
Because molten iron is mainly concentrated on the first section cooling wall 1, the second section cooling wall 2 and the third section cooling wall 3 of the furnace hearth, the fourth section cooling wall 4 almost has no molten iron accumulation, and the molten iron has an erosion effect on carbon bricks in the furnace, the fourth section cooling wall 4 does not need industrial water for enhanced cooling. Soft water enters from the fourth section cooling wall 4 and penetrates out of the uppermost part of the furnace body, and the soft water is circulated in the blast furnace cooling system in a closed manner, so that water can be saved, and fresh water is rarely supplemented. Industrial water enters from the first section of cooling wall 1, penetrates out from the upper part of the third section of cooling wall 3, and is subjected to series-connection closed cooling between the four sections of cooling walls in the furnace (longitudinally, namely in the height direction), so that the cooling strength of the cooling walls is improved, and the damage of the local cooling wall of the blast furnace hearth is relieved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A cooling system for slowing down the damage of a local cooling wall of a blast furnace hearth is characterized in that the cooling system comprises an industrial water ring pipe, a soft water supply main pipe, a water return tank and a water return pipe, wherein the industrial water ring pipe, the soft water supply main pipe, the water return tank and the water return pipe are sequentially arranged on a blast furnace from bottom to top,
the first section of cooling wall is communicated with a first water inlet pipe, the third section of cooling wall is communicated with a first water outlet pipe, and the fourth section of cooling wall is communicated with a second water inlet pipe and a second water outlet pipe;
the soft water supply main pipe, the second water inlet pipe, the fourth section cooling wall and the second water outlet pipe are sequentially communicated to form a first passage for soft water circulation, and the soft water in the first passage can cool the fourth section cooling wall;
the industrial water ring pipe, the first section cooling wall, the second section cooling wall, the third section cooling wall, the first water outlet pipe, the water return pipe and the water return groove are sequentially communicated to form a second passage for industrial water circulation, and industrial water in the second passage can cool the first section cooling wall, the second section cooling wall and the third section cooling wall.
2. The cooling system for slowing the breakage of the local cooling wall of the blast furnace hearth according to claim 1,
the first section of cooling wall is communicated with the second section of cooling wall through a first connecting water pipe, and the second section of cooling wall is communicated with the third section of cooling wall through a second connecting water pipe.
3. The cooling system for slowing the breakage of the local cooling wall of the blast furnace hearth according to claim 1,
the soft water main pipe is also communicated with the first water inlet pipe through a first water supply pipe, a first three-way ball valve and a second three-way ball valve are arranged on the first water supply pipe,
the first three-way ball valve is respectively communicated with the soft water main water supply pipe, the second three-way ball valve and a second water supply pipe, the second water supply pipe is communicated with the second water inlet pipe, and the soft water main water supply pipe can be communicated with the second water inlet pipe by adjusting the first three-way ball valve;
the second three-way ball valve is respectively communicated with the first three-way ball valve, the industrial water ring pipe and the first water inlet pipe, and the industrial water ring pipe can be communicated with the first water inlet pipe by adjusting the second three-way ball valve.
4. The cooling system for slowing the breakage of the local cooling wall of the blast furnace hearth according to claim 3,
the industrial water ring pipe is communicated with the second three-way ball valve sequentially through an industrial water supply branch pipe and a third water supply pipe;
the industrial water supply system is characterized in that a distributor is arranged between the industrial water supply branch pipe and the third water supply pipe, a first gate valve is arranged at the joint of the industrial water ring pipe and the industrial water supply branch pipe, a plurality of water outlet pipes are arranged on the distributor, a second gate valve is arranged on each water outlet pipe, and the third water supply pipe is communicated with one water outlet pipe of the distributor.
5. The cooling system for slowing the breakage of the local cooling wall of the blast furnace hearth according to claim 4, wherein the cooling system comprises a cooling system,
the second water supply pipe is a metal hard pipe, the third water supply pipe is a metal hose, and the water return pipe is a metal hard pipe.
6. The cooling system for slowing the breakage of the local cooling wall of the blast furnace hearth according to claim 1,
the flow Q of the soft water in the first passage is 21t/h, and the flow speed V is 1.75 m/s;
the temperature of the soft water in the first passage before entering the fourth section cooling wall is 39-41 ℃.
7. The cooling system for slowing the breakage of the local cooling wall of the blast furnace hearth according to claim 1,
the flow Q of the industrial water in the second passage is 30 t/h-35 t/h, and the flow speed V is 2.51 m/s-2.92 m/s.
8. The cooling system for slowing the breakage of the local cooling wall of the blast furnace hearth according to claim 1,
the temperature of the industrial water in the second passage before entering the first section of the cooling wall is 24-28 ℃.
9. The cooling system for slowing the breakage of the local cooling wall of the blast furnace hearth according to claim 1,
the temperature difference delta t of the industrial water in the second passage between the first section of cooling wall and the third section of cooling wall is 0.2-0.4 ℃.
10. The cooling system for slowing the breakage of the local cooling wall of the blast furnace hearth according to claim 4, wherein the cooling system comprises a cooling system,
and a drain pipe is connected with the distributor and is provided with a drain valve.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111270035A (en) * | 2020-04-07 | 2020-06-12 | 大冶特殊钢有限公司 | Cooling system for slowing down damage of local cooling wall of blast furnace hearth |
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