A method for distributing and operating a molten iron tank

Abstract

The invention discloses a molten iron tank distribution and operation method in the technical field of molten iron tank transportation. The method adopts a double-tank operation mode, arranges three tanks for use on railway line II, and arranges one tank for use on railway line I. When two tanks are delivered from railway line II, they are arranged to be transported to a steel mill. Meanwhile, a locomotive is arranged to hang two empty tanks to a blast furnace on railway line I, and then the two empty tanks are combined with an unfilled tank on the original railway line I through a tractor to form a new railway line II. The remaining tank on the original railway line II is the new railway line I. Each time two heavy tanks are delivered, the tanks are delivered to the steel mill, and railway line II and railway line I are switched. The number of molten iron tanks in online operation is small, the operation efficiency of the molten iron tanks is high, and the maintenance cost of the molten iron tanks is effectively reduced. The situation of unfilled tanks in each trip is easy to control. The operation steps are simplified. With the same number of locomotives, the tank distribution time is greatly shortened, and the production efficiency is improved. The production connection between the steel mill and the blast furnace is compact, and the temperature loss of the molten iron transported to the steel mill is low.

Description

Technical Field

[0001] The invention relates to the technical field of molten iron tank transportation, and in particular to a molten iron tank distribution and operation method. Background Art

[0002] The environment of the iron-making yard under the blast furnace is complex. For safety reasons, the tanks need to be loaded at one time before the iron mouth opens, and the number of tanks must meet the demand for this iron-making (the maximum number of molten iron tanks required is calculated based on the previous iron-making volume). Empty tanks can be added under special circumstances; the loading and unloading of tanks, alignment, and delivery of heavy tanks to the steel mill are all completed in front of the blast furnace by the locomotive "pulling" and "pushing"; usually, only after the iron-making is completed once, it will be hung to the steel mill by a hook of the locomotive for use, and then the empty tanks will be hung from the steel mill / station to the blast furnace for loading and unloading, and so on.

[0003] Existing tank distribution mode Figure 2 As shown: tanks are distributed in the mode of "5 (railway line II) + 1 (railway line I)". After one trip of iron is produced by railway line II, the swing nozzle hits railway line I to produce iron. Railway line II is aligned with the next position, and the swing nozzle hits railway line II to produce iron again. This is repeated until the current iron is produced. During this process, "big head tanks / small head tanks" (tanks that are not full of molten iron) will appear. When the next trip of iron is produced, railway line I will be replaced by railway line II, and railway line II will be replaced by railway line I. In order to prevent serious capping and sill formation, the "big head tanks / small head tanks" of the previous trip of iron need to be arranged in the first 3 positions of iron production as much as possible.

[0004] "Pulling" and "pushing" tank operations: "Pulling" tank operations are to pull out molten iron tanks one by one during the iron-casting process to match them with the tanks. After the iron-casting is completed, the heavy tanks and "big-end tanks / small-end tanks" are pulled out to the station for uncoupling. The heavy tanks are sent to the steelmaking plant, and the empty tanks and "big-end tanks / small-end tanks" are hung on "Railway Line Ⅰ". Then the "big-end tanks / small-end tanks" on "Railway Line Ⅰ" are hung to make the "Railway Line Ⅱ" for the next trip of iron and start the "pushing" tank operation. The remaining empty molten iron tanks on "Railway Line Ⅱ" from the previous trip of iron (if there are tank replenishment or iron-casting is abnormal, there will be 1-3 empty tanks) will be used as the "Railway Line Ⅰ" for the next trip of iron. The "pushing" tank operation is to push the molten iron tanks one by one to the back of the furnace to match the tanks during the iron-tapping process. After the iron-tapping is completed, no matter how many empty tanks are left, they are hooked out and taken to the station for unhooking. The heavy tanks are sent to the steelmaking plant, and the corresponding empty tanks are hung. Then, the original empty tanks and "big head tanks / small head tanks" are reversed under the furnace, and the "big head tanks / small head tanks" are arranged as much as possible in the first 3 positions of the iron-tapping, and the iron-tapping is switched to the "Railway Line II" and "Railway Line I" lines.

[0005] The existing methods for distributing and operating molten iron have the following disadvantages:

[0006] 1. A train trip needs to be equipped with enough empty iron tanks at one time. Sometimes not all the iron tanks can be filled. When the locomotives use different methods of "pulling" and "pushing" to align the tanks, a large number of iron tanks need to be circulated, resulting in a large number of iron tanks running online, affecting the operation efficiency of the iron tanks;

[0007] 2. Except when the last molten iron tank is just full, each blast furnace has at least two "big head tanks / small head tanks". The next trip of iron needs to be arranged first. The locomotive operation process is cumbersome and the tank alignment time is long;

[0008] 3. The heavy tanks of molten iron are sent to the steel mill only after a trip of iron is finished. The heavy tanks of molten iron are piled up under the blast furnace, affecting the rhythm of steel production. The molten iron tanks will have lids and ridges, and the tank condition is poor. Many molten iron tanks need to be repaired and refurbished. Summary of the invention

[0009] The present invention provides a molten iron ladle distribution and operation method to solve the problems raised in the above background technology.

[0010] The present invention provides a molten iron tank distribution and operation method, which adopts the following technical scheme: the molten iron tank distribution and operation method adopts a double tank operation mode, and the tank distribution adopts 3+1 to tap iron at the tapping hole of a single blast furnace, a heavy tank is pulled in front of the blast furnace, and an empty tank is supplemented by a tractor behind the blast furnace, which specifically includes:

[0011] Arrange 3 tanks for use on Railway Line II and 1 tank for use on Railway Line I. When 2 tanks are produced on Railway Line II, arrange to transport them to the steel plant. At the same time, arrange a locomotive to hang 2 empty tanks to the blast furnace on Railway Line I, and then use a traction vehicle to combine them with the 1 unfilled tank on the original Railway Line I to form a new Railway Line II. The remaining tank on the original Railway Line II is the new Railway Line I. Each time 2 heavy tanks are produced, they are sent to the steel plant, and Railway Line II and Railway Line I are switched, and this cycle is repeated until the iron production is completed.

[0012] Optionally, the blast furnace predicts the end time of iron tapping in advance based on the under-furnace weighing system and iron tapping conditions.

[0013] Optionally, the unfilled tanks are used for the next batch of iron and are combined with empty tanks to form the first and second positions of the iron hauling tank distribution mode, and are sent to the steel mill after being filled with molten iron.

[0014] Optionally, each time two heavy tanks are delivered, they are sent to the steel mill, and the railway line II and railway line I are switched, including dragging a single heavy tank to the steel mill or railway yard, and then the railway line II and railway line I are switched after the two heavy tanks are delivered.

[0015] Optionally, after the railway line II has discharged one tank, the swing nozzle on the blast furnace is used to hit the railway line I to discharge iron. When the railway line II is aligned with the next tank, the swing nozzle is driven back to the railway line II to discharge iron again, and this is repeated until the iron is discharged this time.

[0016] In summary, the present invention includes at least one of the following beneficial effects:

[0017] 1. The number of hot metal ladle running online is small, the hot metal ladle operation efficiency is high, and the maintenance cost of hot metal ladle is effectively reduced;

[0018] 2. The situation of underfilled tanks in each trip is easy to control;

[0019] 3. Although the frequency of locomotives going back and forth between steel mills and stations has increased relatively, the operation steps are simplified. With the same number of locomotives, the tank distribution time is greatly shortened, and the production efficiency is improved;

[0020] 4. The production of steel mills and blast furnaces is closely connected, and the temperature loss of molten iron transported to the steel mill is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0022] Figure 1 This is a schematic diagram of the molten iron tank distribution structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the process of dispensing tanks using the 5+1 mode in the present invention;

[0024] Figure 3 It is a schematic diagram of the process of the present invention.

[0025] Explanation of the accompanying drawings: 1. Steel mill; 2. Railway station; 3. Blast furnace; 4. In front of blast furnace; 5. Behind blast furnace; 6. Swinging spout; 7. Iron outlet. DETAILED DESCRIPTION

[0026] The following is combined with Figure 1 and Figure 3 The present invention is described in further detail.

[0027] Reference Figure 1 The present invention discloses a method for distributing and operating a molten iron ladle, wherein the method adopts a double-tank operation mode, wherein the molten iron ladle is distributed in a 3+1 manner to discharge iron at a tapping hole 7 of a single blast furnace 3, wherein 4 traction ladle is provided in front of the blast furnace, and 5 empty ladle is supplemented by a tractor behind the blast furnace, and specifically includes:

[0028] Arrange 3 tanks for use on Railway Line II and 1 tank for use on Railway Line I. After Railway Line II has produced one tank, it is hit to Railway Line I through the swing nozzle 6 on the blast furnace 3 to produce iron. When Railway Line II is aligned with the next tank, the swing nozzle 6 is hit back to Railway Line II to produce iron again, and this is repeated until the iron is produced this time.

[0029] When two tanks are delivered from Railway Line II, they are arranged to be transported to Steel Plant 1. At the same time, a locomotive is arranged to hang two empty tanks to the blast furnace behind Railway Line I. 5 Through the traction vehicle, they are combined with the one unfilled tank on the original Railway Line I to form a new Railway Line II. The remaining tank of the original Railway Line II is the new Railway Line I. Each time two heavy tanks are delivered, they are sent to Steel Plant 1, and Railway Line II and Railway Line I are switched, and this cycle is repeated until the iron production is completed.

[0030] Blast furnace 3 predicts the end time of iron tapping in advance according to the weighing system under the furnace and the iron tapping situation. The unfilled tanks are used for the next iron batch optimization and combined with the empty tanks to form the first and second positions of the iron tapping tank distribution mode, and are sent to steel mill 1 after being filled with molten iron.

[0031] If the steel plant's production rhythm is tight, you can also drag a single heavy tank to Steel Plant 1 or Railway Yard 2, and then wait until two heavy tanks are delivered before switching between Railway Line II and Railway Line I.

[0032] Among them, the empty tanks returned from Steel Plant 1 are grouped into groups of 3. The empty tanks are placed in order from outside to inside according to the time they enter the plant. When the 3 empty tanks on Railway Line II or Railway Line I of Steel Plant 1 are placed in groups, a locomotive is arranged to transport the group of empty tanks to the station or distribute them to Blast Furnace 3. During the operation, the number of abnormal hot metal tanks to be inspected and processed must be synchronously arranged to be put into operation for rotation.

[0033] Example:

[0034] Reference Figure 3 The present invention provides a method for distributing and operating a molten iron tank: three tanks are arranged for use as railway line II and one tank is arranged for use as railway line I in one trip of iron:

[0035] 1. Assume that the tanks used to load iron under blast furnace 3 in a certain trip are numbered "tank A, tank B, tank C, tank D", and are pushed to blast furnace 3 according to the arrangement of "locomotive → tank A → tank B → tank C → tank D": tank D is used for railway line I;

[0036] 2. When "Tank A and Tank B" are filled with molten iron, they will be transported to Steel Plant 1.

[0037] 3. The "A tank and B tank" filled with molten iron arrive at the railway yard 2. At the same time, a locomotive is arranged to transport two empty tanks "E tank and F tank" into the railway line I and combine them with tank D. The remaining tank on the original railway line II becomes the new railway line I, and the unfilled tank on the original railway line I forms the new railway line II.

[0038] 4. If tank C is not full of molten iron, it can be left under the furnace and used as the original railway line I to continue to hold the next batch of molten iron until the railway line II and railway line I are switched again, and then the new railway line I is filled with molten iron and arranged to be transported to steel plant 1.

[0039] The present invention has a significant effect compared with the following schemes:

[0040] ① If the "double tank" operation mode is used, the tank allocation is "2+1". When switching between "railway line II and railway line I", railway line I needs to allocate one more tank. If the tank allocation is not timely, "iron leakage" may occur, affecting on-site safety (so the number of tanks on railway line II in the tank allocation mode is 1 more than that in the operation mode of the present invention);

[0041] ② If the "double tank" operation mode is used and the tank allocation is "4+1", there will be one more empty tank on Railway Line II. After switching to "Railway Line II, Railway Line I", there will be one more empty tank on Railway Line I, which will affect the turnover rate of the molten iron tank;

[0042] ③ If the "single tank" operation mode is adopted, the tanks are allocated according to "2+1" / "2+2", the tanks are frequently replenished and allocated under the furnace, and a locomotive needs to be added on another line, and the locomotive frequently travels back and forth between the blast furnace and the steel mill / station;

[0043] ④ If the "single tank" operation mode is used and the tank allocation is "3+1", there will be one more empty tank on Railway Line II. After switching to "Railway Line II, Railway Line I", there will be one more empty tank on Railway Line I, which will affect the turnover rate of the molten iron tank;

[0044] ⑤ If the “three tanks” operation mode is followed and the tanks are allocated according to “4+1”, there will be many empty tanks left after the iron is tapped, the operation efficiency of the molten iron tank is low, and the “first” heavy tank may have a lid or a sill. This is almost the same as the traditional molten iron tank distribution and allocation mode.

[0045] The above are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for distributing and operating a molten iron ladle, characterized in that: The iron molten ladle distribution and operation method adopts a double-tank operation mode, and the ladle distribution adopts 3+1 to tap iron at the tapping hole of a single blast furnace, with a heavy ladle pulled in front of the blast furnace and an empty ladle filled by a tractor behind the blast furnace, specifically including: Arrange 3 cans for use on Railway Line II and 1 can for use on Railway Line I. First, the swing nozzle on the blast furnace hits Railway Line II. After Railway Line II has produced a heavy can, it is hit to Railway Line I through the swing nozzle on the blast furnace to produce iron. When Railway Line II is aligned with the next can, the swing nozzle is hit back to Railway Line II to produce iron again. This is repeated until 2 heavy cans are produced on Railway Line II. The can on Railway Line I is an unfilled can. When two heavy tanks are produced on Railway Line II, they are arranged to be transported to the steel plant. At the same time, a locomotive is arranged to hang two empty tanks to the blast furnace on Railway Line I, and then they are combined with an unfilled tank on the original Railway Line I by a traction vehicle to form a new Railway Line II. The remaining tank on the original Railway Line II becomes the new Railway Line I. Each time two heavy tanks are produced, they are sent to the steel plant, and Railway Line II and Railway Line I are switched, and this cycle is repeated until the iron production is completed.

2. A method for distributing and operating a molten iron ladle according to claim 1, characterized in that: The blast furnace predicts the end time of iron tapping in advance according to the under-furnace weighing system and the iron tapping situation.

3. A method for distributing and operating a molten iron ladle according to claim 1, characterized in that: The unfilled tanks are used for the next iron trip and combined with empty tanks to form the first and second positions of the iron hauling tank distribution mode, and are sent to the steel mill after being filled with molten iron.

4. A method for distributing and operating a molten iron ladle according to claim 1, characterized in that: Every time two heavy tanks are shipped out, they are sent to the steel mill, and Railway Line II and Railway Line I are switched, including dragging a single heavy tank to the railway yard. Then, after two heavy tanks are shipped out, Railway Line II and Railway Line I are switched.

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