A short-process clean treatment system for steel slag

Abstract

A short-process clean steel slag treatment system includes a steel slag pretreatment system and a slag-sealing system. The steel slag pretreatment system includes a closed chamber containing a slag-removing pool. A roller slag remover capable of moving along the length of the slag-removing pool is installed in the slag-removing pool. A movable door that can be opened and closed is installed on the closed chamber, and a slag-discharging position is located at the position of the movable door. A slag discharge hole is opened at the bottom of the slag-removing pool, and a slag-sealing system is installed at the bottom of the slag discharge hole. The advantages of this invention are: it compensates for the time interval between slag-sealing operations, avoids the need for additional lifting and transportation using cranes or other lifting equipment when moving between the slag-loading position and the slag-sealing position, reduces the steel slag processing cycle, and effectively improves the production efficiency of steel slag treatment.

Description

Technical Field

[0001] This invention relates to the field of steel slag treatment technology, specifically a short-process clean treatment system for steel slag. Background Technology

[0002] Steel slag, produced during steelmaking, exhibits large temperature fluctuations and complex physical forms, leading to significant challenges in its handling and numerous safety hazards. This necessitates high standards for the reliability, stability, and safety of the processes and equipment. Currently, steel companies generally employ a closed-loop, heat-sealing treatment method for steel slag generated during steelmaking. This typically involves placing a slag-sealing tank below the slag removal pit. After slag is loaded, it is transferred to the slag-sealing position using cranes or similar lifting equipment. Once slag sealing is complete, it is dumped and then transported back to the slag removal pit for reloading. Because the slag-sealing process takes significantly longer than the loading operation, and loading cannot be performed during slag sealing, the entire steel slag treatment cycle is lengthy, resulting in low production efficiency. Summary of the Invention

[0003] The purpose of this invention is to provide a short-process clean treatment system for steel slag. The steel slag pretreatment system has two movable slag-sealing tanks installed below the slag-removing pool. The two slag-sealing tanks can perform slag loading and slag-sealing operations respectively. Moreover, they can move by rail without the need for additional cranes or other lifting equipment, allowing the slag loading and slag-sealing operations to be carried out simultaneously, making up for the time interval between slag-sealing operations, and solving the problems in the prior art.

[0004] The technical solution adopted by this invention to solve its technical problem is as follows: A short-process clean treatment system for steel slag, comprising a steel slag pretreatment system and a slag-sealing system, wherein the steel slag pretreatment system includes a closed chamber, a slag-removing pool within the closed chamber, a roller slag remover installed in the slag-removing pool capable of moving along its length, a movable door installed on the closed chamber, a slag-discharging position located at the movable door, a slag discharge hole at the bottom of the slag-removing pool, and a slag-sealing system at the bottom of the slag discharge hole. The slag-sealing system includes a track, on which two sets of movable transfer trolleys are installed, each transfer trolley is equipped with a sealed tank, and a slag-sealing tank is installed inside the sealed tank. A slag-loading position is located on the track at the bottom of the slag discharge hole, and lifting positions are located at both ends of the track along its length. A slag-sealing position is located on the track between the slag-loading position and the lifting position, and a vertically lifting sealing cover assembly is installed at the slag-sealing position. The sealing cover assembly cooperates with the sealing tank, and a water spray pipe is installed inside the sealing cover assembly. The movable door is located at one end of the length of the enclosed chamber, and the slag discharge hole is located at the end of the slag removal pool away from the movable door. A set of slag-sealing systems is installed at the bottom of the steel slag pretreatment system. The movable door is located in the middle of the enclosed chamber, and the slag discharge holes are located at both ends of the length of the slag removal pool. Each slag discharge hole has a track at its bottom, and two sets of slag-sealing systems are installed at the bottom of the steel slag pretreatment system. A dust collection hood is installed on the enclosed chamber, and the dust collection hood and the sealing cover assembly are equipped with interconnected dust removal pipes. The roller slag remover includes a slag removal trolley, on which are mounted rotatable wheels and rollers. The rollers include roller cylinders, and roller shafts are installed at both ends of the roller cylinders. Circumferentially arranged protruding plates are provided on the outer circumference of the roller cylinders. Several slag removal plates are installed on each protruding plate, and detachable bolts are installed on the slag removal plates. Through holes that mate with the bolts are opened on the protruding plates, and the slag removal plates on adjacent protruding plates are arranged alternately. The sealing cover assembly includes a sealing cover body, a water spray pipe installed inside the sealing cover body, a movable sealing pipe installed at the top of the sealing cover body, a first raised edge at the upper end of the movable sealing pipe, a fixed sealing pipe fitted around the outer periphery of the movable sealing pipe, a second raised edge at the lower end of the fixed sealing pipe, a flange sealing ring between the first and second raised edges, the inner cavity of the fixed sealing pipe engaging with the first raised edge, and the inner periphery of the second raised edge engaging with the movable sealing pipe. Vertical lifting mechanisms are installed on both sides of the sealing cover body, each including a hydraulic cylinder. The cylinder body of the hydraulic cylinder is fixedly connected to the sealing cover body via a lifting arm. A guide plate is also installed on one side of the hydraulic cylinder, and a guide wheel engaging with the guide plate is provided on the cylinder body. A cover sealing ring engaging with the sealing tank is also installed at the bottom of the sealing cover body. The extension and retraction of the piston rod of the hydraulic cylinder can move the sealing cover body closer to or away from the sealing tank. A venting chimney connects the fixed sealing pipes of the two sets of slag-sealing positions on the same track.The dynamic water spray control process for the slag curing process includes the following steps: ① Steel slag is successively loaded into the slag curing tank. The loading amount is monitored in real time by a track scale. When the loading amount reaches the set value, the weighing data of the loading amount is transmitted to the computer, and the loading is stopped; ② During the process from the start to the completion of loading, the temperature measuring element measures the temperature of the steel slag in the slag curing tank. After several interval measurements, the average value is taken and transmitted to the computer; ③ After the initial data of the steel slag in the slag curing tank is obtained by weighing and temperature measurement, the computer calculates the total amount of water sprayed for the steel slag curing based on the water spray volume model. The computer establishes the water spray system according to the set water distribution equation to realize the automated control of the slag curing process. The water spray volume calculation model is as follows:

[0005] Steel slag weight (weighing value): M0

[0006] Initial temperature of steel slag (measured value): (t1+t2+t3+......+tn) / n=T0

[0007] Slag temperature after slag curing (empirical value): T1

[0008] Specific heat capacity of steel slag (isobaric): 1.248 kJ / kg℃

[0009] The total heat released by the steel slag: Q0=M0*(T0-T1)*1.248kJ / kg℃

[0010] Moisture content per ton of slag (set value): 0.08

[0011] Sludge supply water temperature (measured value): T2

[0012] Slag temperature after slag curing: T1

[0013] Water carried away by steel slag: 0.08M0

[0014] Specific heat capacity of water: 4.2 kJ / kg℃

[0015] The heat carried away by water in steel slag: Q1 = 0.08M0 * (T2 - T1) * 4.2 kJ / kg℃

[0016] Sludge supply water temperature (measured value): T2

[0017] Specific heat capacity of water: 4.2 kJ / kg℃

[0018] Steam temperature (measured value): T3

[0019] Specific heat capacity of steam: 1.84 kJ / kg℃

[0020] Phase transition enthalpy of water: 2257 kJ / kg

[0021] Evaporation rate of slag water:

[0022] M1=(Q0-Q1) / [(100℃-T2)4.2kJ / kg℃+2257kJ / kg+(T3-100℃)1.84kJ / kg℃]

[0023] Water supply for sludge treatment: M2 = 0.08M0 + M1

[0024] Sludge spraying time: t

[0025] Average water spray volume for slag removal: q = M2 / t

[0026] Water distribution equation: q(t) = 1.5q(0 - 0.25t),

[0027] 1.25q(0.25t-0.5t),

[0028] q(0.5t-0.75t),

[0029] 0.25q(0.75tt);

[0030] ④ After the slag loading is completed, the transfer trolley moves the slag-sealing tank from the slag loading position to the slag-sealing position. After the sensor obtains the position signal, the sealing cover assembly descends to the slag-sealing tank to seal it, realizing slag sealing under pressurized and micro-pressurized conditions; ⑤ The slag-sealing cover and the sealing tank are equipped with thermocouples. The temperature is measured, statistically analyzed, and corrected by the computer. When the temperature drops to the set value, the water spraying stops, the slag-sealing cover rises automatically, the slag sealing ends, and the transfer trolley is moved to the hoisting position.

[0031] The positive effects of this invention are as follows: The steel slag short-process clean treatment system of this invention includes a steel slag pretreatment system and a slag-sealing system. The steel slag pretreatment system is equipped with a closed chamber and a slag removal pool. The bottom of the slag removal pool is provided with a slag discharge hole. The slag-sealing system is provided below the slag discharge hole. The slag-sealing system includes a track, on which two sets of transfer trolleys are installed. Each trolley is equipped with a slag-sealing tank. The slag-sealing tank can move and transfer between the slag loading position, the slag-sealing position, and the hoisting position. The alternating movement of the two sets of slag-sealing tanks allows for simultaneous slag loading and slag-sealing operations, compensating for the time interval between slag-sealing operations. At the same time, it avoids the need for additional hoisting and transfer using cranes or other lifting equipment when moving between the slag loading position and the slag-sealing position, reducing the steel slag treatment cycle and effectively improving the production efficiency of steel slag treatment. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of the present invention;

[0033] Figure 2 yes Figure 1 The left view is rotated 90 degrees counterclockwise;

[0034] Figure 3 yes Figure 1 A bottom view;

[0035] Figure 4 This is a schematic diagram of a steel slag pretreatment system with two sets of slag-sealing systems.

[0036] Figure 5 yes Figure 4 The left view is rotated 90 degrees counterclockwise;

[0037] Figure 6 This is a schematic diagram of the structure of a roller-type muck remover;

[0038] Figure 7 yes Figure 6 The left view is rotated 90 degrees counterclockwise;

[0039] Figure 8 This is a schematic diagram of the roller structure;

[0040] Figure 9 This is a structural schematic diagram of the sealing cover assembly;

[0041] Figure 10 yes Figure 9 A bottom view;

[0042] Figure 11 This is a schematic diagram showing the opening state of the sealing cover assembly when the slag-sealing tank is moved to the slag-sealing position;

[0043] Figure 12 This is a schematic diagram showing the closed state of the sealing cover assembly when the slag-sealing tank is moved to the slag-sealing position. Detailed Implementation

[0044] The present invention provides a short-process clean treatment system for steel slag, such as... Figure 1-3 As shown, it includes a steel slag pretreatment system and a slag-sealing system. The steel slag pretreatment system is used to perform preliminary slag removal treatment on the steel slag, making it into high-temperature blocky steel slag with a relatively uniform physical morphology, and then it is loaded into the slag-sealing system for subsequent slag-sealing treatment.

[0045] The steel slag pretreatment system includes a closed chamber 1, which fully encloses the slag removal area, forming a closed structure and centrally collecting the fumes generated during production. The closed chamber 1 contains a slag removal pool 2, which is a structure for storing and processing initial high-temperature steel slag. This pool can be constructed of reinforced concrete with internal protective lining, and its length, width, and depth dimensions can be calculated and designed based on the steel slag production volume. A roller slag remover 3, capable of moving along its length, is installed within the slag removal pool 2. The roller slag remover 3 crushes and turns the steel slag within the pool 2, serving as equipment for the initial high-temperature steel slag pretreatment.

[0046] A movable door 4 that can be opened and closed is installed on the enclosed chamber 1. A slag dumping position 32 is set at the position of the movable door 4, through which steel slag can be transported to the slag removal pool 2. The movable door 4 can be driven by a motor and moved horizontally along a track to open and close the slag dumping position 32. When the movable door 4 is opened, steel slag is dumped into the slag removal pool 2. After the slag dumping is completed, the movable door 4 is closed, so that the steel slag pretreatment is always carried out in a closed environment.

[0047] A slag discharge hole 5 is provided at the bottom of the slag removal pit 2. A slag sealing system is installed at the bottom of the slag discharge hole 5, allowing the steel slag in the slag removal pit 2 to enter the slag sealing system through the slag discharge hole 5. The slag sealing system includes a track 6, on which two sets of movable transfer trolleys 7 are installed. Each transfer trolley 7 is equipped with a sealing tank 8, and a slag sealing tank 9 is installed inside the sealing tank 8.

[0048] A slag loading position 33 is set on the track 6 at the bottom of the slag discharge hole 5. Slag loading is carried out on the slag loading position 33. Lifting positions 35 are set at both ends of the track 6 along its length. After the slag is sealed, it is moved to the lifting position 35 and can be transferred to the next process by a crane or other lifting equipment. A slag sealing position 34 is set on the track 6 between the slag loading position 33 and the lifting position 35. A sealing cover assembly that can be raised and lowered vertically is installed on the slag sealing position 34. The sealing cover assembly cooperates with the sealing tank 8. A water spray pipe 10 is installed in the sealing cover assembly. After the slag tank 9 is moved to the slag sealing position 34, the sealing cover assembly seals it and sprays water to achieve the slag sealing operation.

[0049] The slag-sealing tank 9 is a container used to hold steel slag and slag-sealing material. The tank body can be made of welded steel structure and lined with wear-resistant and high-temperature resistant plates. The sealing tank 8 is a sealing device for the slag-sealing process. It is installed on the transfer trolley 7 and can move back and forth between the slag loading position 33, the slag-sealing position 34, and the hoisting position 35.

[0050] The steel slag pretreatment system and slag-sealing system may also include temperature measuring elements, automation and control systems, hydraulic systems and auxiliary facilities to control the orderly operation of each component and to perform real-time temperature measurement and action monitoring during the steel slag treatment process. The auxiliary facilities may include water supply and drainage facilities, dust removal systems, power supply and distribution systems and instrumentation facilities to realize dust removal, water spraying, power supply and data monitoring functions during the steel slag treatment process.

[0051] The steel slag pretreatment system and slag-sealing system can be configured as follows: Figure 1 The arrangement shown has the movable door 4 located at one end of the length of the enclosed room 1, the slag discharge hole 5 located at one end of the slag removal tank 2 away from the movable door 4, and a set of slag sealing system at the bottom of the steel slag pretreatment system, that is, a set of roller slag remover 3 is equipped with two slag sealing tanks 9, i.e., a "one-to-two" arrangement.

[0052] To improve the overall efficiency of steel slag treatment, the steel slag pretreatment system and the slag-sealing system can also be configured as follows: Figure 4 and Figure 5 The arrangement is as follows: the movable door 4 is located in the middle of the enclosed room 1, the slag discharge hole 5 is located at both ends of the length of the slag removal pool 2, and each slag discharge hole 5 is equipped with a track 6 at the bottom. The bottom of the steel slag pretreatment system is equipped with two sets of slag sealing systems, that is, one set of roller slag remover 3 is equipped with four slag sealing tanks 9, i.e., a "one-to-four" arrangement.

[0053] The steel slag treatment process for the "one-to-two" arrangement is described below:

[0054] A movable door 4 is installed at one end of the enclosed chamber 1. Before slag dumping, the movable door 4 is opened, and the roller slag remover 3 moves away simultaneously. Steel slag from the steel plant is dumped into the slag removal pool 2. After dumping, the movable door 4 is closed, and the roller slag remover 3 moves towards the steel slag position to remove the slag. Liquid, solid-liquid two-phase, and high-temperature solid steel slag are transformed into relatively uniform high-temperature blocky steel slag by the mechanical force of the slag remover. The roller slag remover 3 moves and pushes the steel slag to the slag discharge hole 5 at the other end, where it falls into the slag-sealing tank 9 below. During the slag loading process, the temperature of the steel slag in the slag-sealing tank 9 is measured, and several discrete temperature values ​​are obtained. When the slag loading amount in the slag-sealing tank 9 reaches the design value, the roller slag remover 3 stops loading. The slag-sealing tank 9 moves from the slag loading position 33 to the slag-sealing position 34, the sealing cover assembly descends, and water is sprayed to seal the slag under sealed conditions. After the slag curing is completed, the sealing cover assembly is raised, the transfer trolley 7 moves to the hoisting position 35, and the overhead crane lifts the slag curing tank 9 out of the sealing tank 8 and transports it to the unloading platform for slag unloading. After unloading, the empty slag curing tank 9 is loaded into the sealing tank 8 and then moved to the slag loading position 33 for the next slag loading operation.

[0055] The steel slag treatment process of the "one-to-four" configuration is as follows:

[0056] A movable door 4 is installed in the middle of the enclosed chamber 1. Before slag dumping, the movable door 4 is opened, and the roller slag remover 3 moves away simultaneously. Steel slag from the steel plant is dumped into the slag removal pool 2. After dumping, the movable door 4 is closed, and the roller slag remover 3 moves towards the steel slag position to remove the slag. Liquid, solid-liquid two-phase, and high-temperature solid steel slag are transformed into relatively uniform high-temperature blocky steel slag by the mechanical force of the slag remover. The roller slag remover 3 moves and pushes the steel slag to the slag discharge hole 5 at one end, where it falls into the slag-sealing tank 9 below. During the slag loading process, the temperature of the steel slag in the slag-sealing tank 9 is measured, and several discrete temperature values ​​are obtained. When the slag loading amount in the slag-sealing tank 9 reaches the design value, the roller slag remover 3 stops loading. The slag-sealing tank 9 moves from the slag loading position 33 to the slag-sealing position 34, the sealing cover assembly descends, and water is sprayed to seal the slag under sealed conditions. After the slag curing is completed, the sealing cover assembly is raised, the transfer trolley 7 moves to the hoisting position 35, and the overhead crane lifts the slag curing tank 9 out of the sealing tank 8 and transports it to the unloading platform for slag unloading. After unloading, the empty slag curing tank 9 is loaded into the sealing tank 8 and then moved to the slag loading position 33 for the next slag loading operation.

[0057] Furthermore, in order to achieve unified collection and treatment of dust during the steel slag processing, a dust collection hood 11 is installed on the enclosed chamber 1, and dust collection pipes 12 are connected to the dust collection hood 11 and the sealing cover assembly.

[0058] Furthermore, such as Figure 6-8 As shown, the roller slag remover 3 includes a slag removal trolley 13, on which rotatable traveling wheels 14 and rollers are installed. Tracks that cooperate with the traveling wheels 14 can be installed on both sides of the slag removal pool 2 along the length direction, so that the roller slag remover 3 can travel back and forth along the length direction of the slag removal pool 2. The rotation of the rollers can crush and turn over the steel slag inside.

[0059] The roller includes a roller cylinder 15, with roller shafts 16 installed at both ends. Circularly arranged protruding plates 17 are provided on the outer periphery of the roller cylinder 15. Several slag-removing plates 18 are fitted onto each protruding plate 17, and detachable bolts 19 are installed on each slag-removing plate 18. Through holes that mate with the bolts 19 are provided on the protruding plates 17. The slag-removing plates 18 on adjacent protruding plates 17 are arranged in a staggered pattern. The slag-removing plates 18 are wear parts that can be replaced promptly to reduce costs. The staggered arrangement of the slag-removing plates 18 allows the roller to perform a more even and thorough slag removal operation during rotation.

[0060] When the rollers rotate, the slag-removing plates 18 on their outer periphery remove slag. When the slag-removing trolley 13 moves horizontally, the slag-removing plates 18 can push the steel slag. The roller slag remover 3 has the functions of crushing, loosening, and pushing steel slag. Liquid, solid-liquid two-phase, and high-temperature solid steel slag can be transformed into high-temperature blocky steel slag with a relatively uniform physical morphology by the mechanical force of the slag remover, which is convenient for subsequent slag-sealing operations. The slag-removing plates 18 installed on the rollers 15 directly act on the high-temperature steel slag during the working process. They are vulnerable parts and are easy to replace. The structure of the slag-removing plates 18 is conducive to crushing and turning the steel slag, and has a higher efficiency in pushing steel slag. It is easy to maintain, has high processing efficiency, and strong slag-breaking ability. It can be better used in conjunction with the subsequent high-efficiency slag-sealing tank 9, so as to improve the production efficiency of the entire production line.

[0061] The rotational force on the rollers can be matched with the traveling speed of the slag-removing trolley 13. The magnitude of the force is inversely proportional to the traveling speed. Within the set maximum force range, data is collected based on actual operating conditions to establish a database of rotational speed and traveling speed values. An equation is fitted to establish an operating control model for the roller slag remover 3. Specifically, during the slag removal process, when the upward force of the steel slag on the rollers reaches the set value, the trolley will stop moving forward and rotate in place to remove the slag. When the force decreases to 75% of the maximum value, it will gradually move forward.

[0062] like Figure 9 and Figure 10 As shown, the sealing cover assembly includes a sealing cover body 20, and a water spray pipe 10 is installed inside the sealing cover body 20. The water spray pipe 10 can spray water into the slag-sealing tank 9 for slag-sealing operations. In order to realize the emission of flue gas and water vapor during the slag-sealing process, a movable sealing pipe 21 is installed at the top of the sealing cover body 20. The upper end of the movable sealing pipe 21 is provided with a first protruding edge 22. A fixed sealing pipe 23 is also fitted on the outer periphery of the movable sealing pipe 21. The lower end of the fixed sealing pipe 23 is provided with a second protruding edge 24. The movable sealing pipe 21 can be vertically raised and lowered relative to the fixed sealing pipe 23. In order to ensure the sealing connection between the movable sealing pipe 21 and the fixed sealing pipe 23, a flange sealing ring 25 is provided between the first protruding edge 22 and the second protruding edge 24. The inner cavity of the fixed sealing pipe 23 cooperates with the first protruding edge 22, and the inner periphery of the second protruding edge 24 cooperates with the movable sealing pipe 21. The first protruding edge 22 and the second protruding edge 24 can form a vertical movement limit.

[0063] To achieve vertical lifting of the sealing cover body 20, vertical lifting mechanisms are installed on both sides of the sealing cover body 20. Each vertical lifting mechanism includes a hydraulic cylinder 26. The cylinder body of the hydraulic cylinder 26 is fixedly connected to the sealing cover body 20 via a lifting arm 27. A guide plate 28 is also installed on one side of the hydraulic cylinder 26. The cylinder body of the hydraulic cylinder 26 is equipped with a guide wheel 29 that cooperates with the guide plate 28. The extension and retraction of the piston rod of the hydraulic cylinder 26 can drive the sealing cover body 20 closer to or further away from the sealing tank 8. To ensure the sealing performance of the slag-sealing tank 9 at the slag-sealing position 34, a cover sealing ring 30 that cooperates with the sealing tank 8 is also installed at the bottom of the sealing cover body 20. When the transfer trolley 7 moves to the slag-sealing position 34, the sealing cover body 20 moves down to cooperate with the sealing tank 8 for sealing connection. At the same time, the moving sealing pipe 21 and the fixed sealing pipe 23 are aligned, and the entire slag-sealing device is sealed, forming a sealed container for slag sealing.

[0064] After slag loading, the mobile slag-sealing tank 9 is directly moved to the slag-sealing position 34, and after slag sealing, it is directly moved to the hoisting position 35. The process requires no overhead crane, resulting in higher production efficiency. Through computer-controlled precision water spraying technology and tank temperature measurement technology, along with a superior dynamic water spraying system, slag sealing efficiency is higher, the slag sealing effect is better, and the slag sealing time is shortened. Simultaneously, no water accumulation occurs inside the sealed tank, eliminating the need for wastewater discharge and treatment, making the production process highly efficient and energy-saving.

[0065] Furthermore, in order to facilitate the discharge of excess flue gas during the ash-sealing process, a venting chimney 31 is connected to the fixed sealing pipes 23 of the two sets of ash-sealing positions 34 on the same track 6.

[0066] The dynamic water spray control process for the slag curing process is characterized by the following steps:

[0067] ① Steel slag is continuously loaded into the slag-filling hopper. The loading amount is monitored in real time by a track scale. When the loading amount reaches the set value, the weighing data of the loading amount is transmitted to the computer and the loading is stopped.

[0068] ② During the process from the start of slag loading to the completion of slag loading, the temperature measuring element measures the temperature of the steel slag in the slag-filling pot. After several intervals, the average value is taken and the temperature value is transmitted to the computer.

[0069] ③ After the initial data of the steel slag in the slag-sealing tank is obtained through weighing and temperature measurement, the computer calculates the total amount of water to be sprayed for slag sealing based on the water spray volume model. The computer establishes the water spraying system according to the set water distribution equation to realize the automated control of the slag sealing process. The water spray volume calculation model is as follows:

[0070] Steel slag weight (weighing value): M0

[0071] Initial temperature of steel slag (measured value): (t1+t2+t3+......+tn) / n=T0

[0072] Slag temperature after slag curing (empirical value): T1

[0073] Specific heat capacity of steel slag (isobaric): 1.248 kJ / kg℃

[0074] The total heat released by the steel slag: Q0=M0*(T0-T1)*1.248kJ / kg℃

[0075] Moisture content per ton of slag (set value): 0.08

[0076] Sludge supply water temperature (measured value): T2

[0077] Slag temperature after slag curing: T1

[0078] Water carried away by steel slag: 0.08M0

[0079] Specific heat capacity of water: 4.2 kJ / kg℃

[0080] The heat carried away by water in steel slag: Q1 = 0.08M0 * (T2 - T1) * 4.2 kJ / kg℃

[0081] Sludge supply water temperature (measured value): T2

[0082] Specific heat capacity of water: 4.2 kJ / kg℃

[0083] Steam temperature (measured value): T3

[0084] Specific heat capacity of steam: 1.84 kJ / kg℃

[0085] Phase transition enthalpy of water: 2257 kJ / kg

[0086] Evaporation rate of slag water:

[0087] M1=(Q0-Q1) / [(100℃-T2)4.2kJ / kg℃+2257kJ / kg+(T3-100℃)1.84kJ / kg℃]

[0088] Water supply for sludge treatment: M2 = 0.08M0 + M1

[0089] Sludge spraying time: t

[0090] Average water spray volume for slag removal: q = M2 / t

[0091] Water distribution equation: q(t) = 1.5q(0 - 0.25t),

[0092] 1.25q(0.25t-0.5t),

[0093] q(0.5t-0.75t),

[0094] 0.25q(0.75tt);

[0095] Where q represents the average water spraying volume during the slag curing process, and q(t) represents the total water spraying volume within a certain time period. The above water spraying process is divided into four water spraying time periods: 0-0.25t, 0.25t-0.5t, 0.5t-0.75t, and 0.75tt. When the water spraying time period is 0-0.25t, the total water spraying volume is 1.5q; when the water spraying time period is 0.25t-0.5t, the total water spraying volume is 1.25q; when the water spraying time period is 0.5t-0.75t, the total water spraying volume is q; and when the water spraying time period is 0.75tt, the total water spraying volume is 0.25q.

[0096] ④ After the slag loading is completed, the transfer trolley moves the slag-sealing tank from the slag loading position to the slag-sealing position. After the sensor obtains the position signal, the sealing cover assembly descends to the slag-sealing tank to seal it, realizing slag sealing under pressure and micro-pressure conditions.

[0097] ⑤ The slag cover and sealing tank are equipped with thermocouples. The temperature is measured, statistically analyzed, and corrected by computer. When the temperature drops to the set value, the water spraying stops, the slag cover rises automatically, the slag sealing ends, and the transfer trolley is moved to the hoisting position.

[0098] Furthermore, when the pressure inside the slag-sealing tank exceeds the upper limit of the set value, water spraying stops; when the pressure drops to the lower limit of the set value, water spraying starts again. When the measured temperature inside the slag-sealing tank drops to 100℃, water spraying stops, and the tank is left to stand for 15 minutes. If the temperature does not rise, the slag-sealing process ends. If the temperature rises by ΔT, the water spraying calculation model is restarted to calculate the water spraying volume, obtaining the evaporation rate M2. The average water spraying volume is set to q / 2, and the slag-sealing time is t1 = M2 / (q / 2). This process continues until the temperature drops to 100℃ and does not rise again after 15 minutes. If the actual water spraying volume is compared with the initially calculated water supply volume and is within the set error range, the slag-sealing process is confirmed to be complete, and the slag-sealing cover is automatically opened. The slag-sealing tank then automatically moves to the hoisting position.

[0099] By adopting dynamic water spray control technology for the slag curing process, the system achieves a higher degree of automation. The water spray volume during the slag curing process is precisely controlled, and no high-alkalinity water accumulates in the sealed tank 8. There is no need to set up a wastewater collection and treatment system, reducing engineering investment. The water used for slag curing is brand new water, avoiding the scaling problem of the slag curing water supply system. The system is more stable in operation and simpler to maintain.

[0100] Furthermore, the water spraying control during the slag removal process is as follows: the initial weight of the steel slag from the steel plant is given. After the steel slag is poured into the slag removal pool, the temperature of the steel slag is measured. If the initial temperature exceeds 1100℃, water spraying is implemented to cool it down. The amount of water sprayed is calculated based on the weight of the steel slag, the measured temperature, and the principle of heat balance. The water spraying system is water spraying.

[0101] The dynamic water spray control of the slag curing process is as follows: Steel slag processed by the roller slag remover 3 is continuously loaded into the slag curing tank 9. A track scale is installed under the transfer trolley 7. When the slag loading reaches the set value, the weighing data is transmitted to the computer. The computer stops loading after determining the set value. Three temperature measuring elements can be installed above the slag curing tank 9. Temperature is measured every few seconds from the start of loading (every time the weight of the steel slag changes, a signal is fed back to the computer, and the computer controls the temperature measuring elements to take a value once). The temperature data is transmitted to the computer, and temperature measurement continues until loading is complete, obtaining three sets of data. The computer calculates and averages these values ​​to obtain a relatively accurate steel slag temperature value. The steel slag in the slag curing tank obtains initial data through weighing and temperature measurement. The computer calculates the total amount of water sprayed for one tank of steel slag based on the water spray volume model. The computer establishes a water spray system based on the set water distribution equation, realizing automated control of the slag curing process.

[0102] The slag-sealing tank 9 can achieve slag sealing under both pressurized and micro-pressurized conditions. The slag-sealing cover and the sealing tank 8 are equipped with thermocouples. The temperature is measured, statistically analyzed, and corrected by a computer. When the temperature drops to the set value, the water spraying stops, the slag-sealing cover automatically rises, the slag sealing ends, and the trolley moves to the hoisting position 35. The water spraying volume is calculated through a dynamic water spraying control model, and the slag sealing time is calculated based on the initial temperature, the amount of steel slag, and the slag loading depth.

[0103] The technical solutions of this invention are not limited to the embodiments described herein. All technical contents not described in detail herein are well-known technologies.

Claims

1. A short-process clean treatment system for steel slag, characterized in that: The system includes a steel slag pretreatment system and a slag-sealing system. The steel slag pretreatment system includes a closed chamber (1), a slag-removing pool (2) inside the closed chamber (1), a roller slag remover (3) that can move along the length direction installed in the slag-removing pool (2), a movable door (4) that can be opened and closed installed on the closed chamber (1), a slag-pouring position (32) set at the position of the movable door (4), a slag discharge hole (5) opened at the bottom of the slag-removing pool (2), and a slag-sealing system set at the bottom of the slag discharge hole (5). The slag-sealing system includes a track (6), and two movable sets of equipment are installed on the track (6). Each transfer trolley (7) is equipped with a sealed tank (8), and a slag-sealing tank (9) is installed inside the sealed tank (8). A slag loading position (33) is set on the track (6) at the bottom of the slag discharge hole (5). A hoisting position (35) is set at both ends of the track (6) in the length direction. A slag-sealing position (34) is set on the track (6) between the slag loading position (33) and the hoisting position (35). A sealing cover assembly that can be vertically lifted and lowered is installed on the slag-sealing position (34). The sealing cover assembly cooperates with the sealed tank (8). A water spray pipe (10) is installed inside the sealing cover assembly. The roller slag remover (3) includes a slag removal trolley (13), on which are mounted rotatable traveling wheels (14) and rollers. The rollers include roller cylinders (15), and roller shafts (16) are mounted at both ends of the roller cylinders (15). Circularly arranged protruding plates (17) are provided on the outer periphery of the roller cylinders (15). Several slag removal plates (18) are installed on each protruding plate (17). Detachable bolts (19) are installed on the slag removal plates (18). Through holes that cooperate with the bolts (19) are opened on the protruding plates (17). The slag removal plates (18) on adjacent protruding plates (17) are arranged in an alternating manner. The sealing cover assembly includes a sealing cover body (20), a water spray pipe (10) installed inside the sealing cover body (20), a movable sealing pipe (21) installed at the top of the sealing cover body (20), a first protruding edge (22) provided at the upper end of the movable sealing pipe (21), a fixed sealing pipe (23) also fitted around the outer periphery of the movable sealing pipe (21), a second protruding edge (24) provided at the lower end of the fixed sealing pipe (23), wherein a flange sealing ring (25) is provided between the first protruding edge (22) and the second protruding edge (24), the inner cavity of the fixed sealing pipe (23) cooperates with the first protruding edge (22), and the inner periphery of the second protruding edge (24) cooperates with the movable sealing pipe (23). The sealing pipe (21) is matched with the vertical lifting mechanism installed on both sides of the sealing cover body (20). Each vertical lifting mechanism includes a hydraulic cylinder (26). The cylinder body of the hydraulic cylinder (26) is fixedly connected to the sealing cover body (20) through the lifting arm (27). A guide plate (28) is also installed on one side of the hydraulic cylinder (26). The cylinder body of the hydraulic cylinder (26) is provided with a guide wheel (29) that matches the guide plate (28). The bottom of the sealing cover body (20) is also equipped with a cover sealing ring (30) that matches the sealing tank (8). The extension and retraction of the piston rod of the hydraulic cylinder (26) can drive the sealing cover body (20) to move closer to or away from the sealing tank (8). The movable door (4) is located in the middle of the enclosed room (1), and the slag discharge holes (5) are opened at both ends of the length direction of the slag removal pool (2). Each slag discharge hole (5) is equipped with a track (6) at the bottom. Two sets of slag sealing systems are set at the bottom of the steel slag pretreatment system. A dust collection hood (11) is installed on the enclosed room (1), and a connected dust removal pipe (12) is installed on both the dust collection hood (11) and the sealing cover assembly. A venting chimney (31) is connected to the fixed sealing pipe (23) of the two sets of slag filling positions (34) on the same track (6).

2. The dynamic water spraying control process for the slag-sealing process in the short-process clean treatment system for steel slag as described in claim 1, characterized in that: Includes the following steps: ① Steel slag is continuously loaded into the slag-filling hopper. The loading amount is monitored in real time by a track scale. When the loading amount reaches the set value, the weighing data of the loading amount is transmitted to the computer and the loading is stopped. ② During the process from the start of slag loading to the completion of slag loading, the temperature measuring element measures the temperature of the steel slag in the slag-filling pot. After several intervals, the average value is taken and the temperature value is transmitted to the computer. ③ After the initial data of the steel slag in the slag-sealing tank is obtained through weighing and temperature measurement, the computer calculates the total amount of water to be sprayed for slag sealing based on the water spray volume model. The computer establishes the water spraying system according to the set water distribution equation to realize the automated control of the slag sealing process. The water spray volume calculation model is as follows: Weighing value of steel slag: M0 The measured value of the initial temperature of the steel slag: (t1+t2+t3+......+tn) / n=T0 Empirical value of slag temperature after slag curing: T1 Specific heat capacity of steel slag under isobaric conditions: 1.248 kJ / kg℃ The total heat released by the steel slag: Q0 = M0 * (T0 - T1) * 1.248 kJ / kg℃ The set value for moisture content per ton of slag is 0.

08. Measurement value of the sludge supply water temperature: T2 Slag temperature after slag curing: T1 Water carried away by steel slag: 0.08M0 Specific heat capacity of water: 4.2 kJ / kg℃ The heat carried away by water in the steel slag: Q1 = 0.08M0 * (T2 - T1) * 4.2 kJ / kg℃ Measurement value of the sludge supply water temperature: T2 Specific heat capacity of water: 4.2 kJ / kg℃ Measured steam temperature: T3 Specific heat capacity of steam: 1.84 kJ / kg℃ Phase transition enthalpy of water: 2257 kJ / kg Evaporation rate of slag water: M1=(Q0-Q1) / [(100℃-T2)4.2kJ / kg℃+2257kJ / kg+(T3-100℃)1.84kJ / kg℃] Water supply for sludge removal: M2 = 0.08M0 + M1 Sludge spraying time: t Average spray volume of slag: q = M2 / t Water distribution equation: q(t) = 1.5q (0 - 0.25t), 1.25q (0.25t-0.5t), q (0.5t-0.75t), 0.25q (0.75tt); ④ After the slag loading is completed, the transfer trolley moves the slag-sealing tank from the slag loading position to the slag-sealing position. After the sensor obtains the position signal, the sealing cover assembly descends to the slag-sealing tank to seal it, realizing slag sealing under pressure and micro-pressure conditions. ⑤ The slag cover and sealing tank are equipped with thermocouples. The temperature is measured, statistically analyzed and corrected by computer. When the temperature drops to the set value, the water spraying stops, the slag cover rises automatically, the slag sealing ends, and the transfer trolley is moved to the hoisting position. When the pressure inside the slag-sealing tank exceeds the upper limit of the set value, water spraying stops. When the pressure drops to the lower limit of the set value, water spraying starts again. When the measured temperature inside the slag-sealing tank drops to 100℃, water spraying stops and the tank is left to stand for 15 minutes. If the temperature does not rise, the slag-sealing process ends. If the temperature rises by ΔT, the water spraying volume calculation model is restarted to calculate the water spraying volume and obtain the evaporation volume M2. The average water spraying volume is set to q / 2. The slag-sealing time is t1 = M2 / (q / 2) until the temperature drops to 100℃ and the tank stops rising after standing for 15 minutes. The actual water spraying volume is compared with the initial calculated water supply volume. If the actual water spraying volume is within the set error range, the slag-sealing process is confirmed to be complete. The slag-sealing cover is automatically opened, and the slag-sealing tank is automatically moved to the hoisting position.

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