CN218994088U - Rotary hearth furnace production system capable of controlling pellet feeding amount - Google Patents
Rotary hearth furnace production system capable of controlling pellet feeding amount Download PDFInfo
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- CN218994088U CN218994088U CN202221217669.2U CN202221217669U CN218994088U CN 218994088 U CN218994088 U CN 218994088U CN 202221217669 U CN202221217669 U CN 202221217669U CN 218994088 U CN218994088 U CN 218994088U
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Abstract
The utility model discloses a rotary hearth furnace production system capable of controlling the feeding amount of pellets, which is sequentially provided with a preamble unit, a drying unit and a rotary hearth furnace unit, wherein a pellet storage and conveying unit is arranged between the drying unit and the rotary hearth furnace unit; the pellet storage and conveying unit comprises a drying pellet bin and a pellet feeding amount control unit connected with the drying pellet bin; the dried ball bin is connected with a green ball dryer of the drying unit through a belt conveyor; the pellet feeding amount control unit is connected with the vibration distributing device of the rotary hearth furnace unit. According to the utility model, the pellet charging amount control unit is used for controlling the pellet charging amount, the standard charging amount of the rotary hearth furnace is set, the real-time charging amount of the pellets is fed back to the PLC through the metering belt scale, and the purpose of automatically controlling the pellet charging amount is realized through the PLC, so that the pellet charging amount is stably controlled, the sintering quality of the rotary hearth furnace is further improved, the pulverization rate is reduced, and the product quality and the product yield of the rotary hearth furnace are improved.
Description
Technical Field
The utility model relates to the field of rotary hearth furnace production lines, in particular to a rotary hearth furnace production system capable of controlling the furnace feeding amount of pellets.
Background
A great amount of dust and mud is produced in the iron and steel smelting production process, mainly blast furnace gas ash or mud, electric furnace dust, converter dust and mud and the like. For a long time, most of the iron-containing dust mud is directly returned to sintering for use, and part of the iron-containing dust mud is piled up in factories or sold outside. In order to realize the comprehensive utilization of the dust and mud generated in the production process, reduce the discharge amount of waste, the metallurgical iron-containing zinc-containing dust and mud resources generated in the production process are treated through a rotary hearth furnace production line in China, metallized pellets (DRI) are produced for blast furnaces, converters and electric furnaces, the iron and zinc resources in the metallized pellets are recovered, the recycling of the resources is realized, and the environmental protection requirement is met. The rotary hearth furnace production line mainly comprises production procedures of raw material proportioning, raw material mixing and ball pressing, raw ball screening, drying, sintering and the like, wherein the operation content of the sintering procedure is that the dried pellets are directly conveyed to a vibration distributor 3 through a belt conveyor, the pellets are uniformly spread in a hearth of a rotary hearth furnace 4 through the vibration distributor 3, the pellets sequentially pass through a heating zone, a first reduction zone, a second reduction zone and a third reduction zone through rotation of the hearth, and finally the sintered pellets are discharged from the rotary hearth furnace through a discharging screw 5.
In the prior art, the furnace feeding amount of the pellets lacks a control method and a monitoring means, the pellets after being dried are directly conveyed into the vibration distributing device through the belt conveyor, the belt conveyor and the vibration distributing device do not have the function of adjusting and controlling the conveying amount, the problem of large fluctuation of the furnace feeding amount can occur in the direct conveying operation mode, and the problem of unstable sintering of the pellets in the rotary hearth furnace, which further affects the quality and the pulverization rate increase of the metallized pellets, is caused by the unstable furnace feeding amount of the pellets.
Disclosure of Invention
Aiming at the problems in the prior art, the utility model aims to provide a rotary hearth furnace production system capable of controlling the pellet feeding amount, wherein a pellet feeding amount control unit is added between a drying unit and a vibration distributor of a rotary hearth furnace, the pellet feeding amount is controlled by the pellet feeding amount control unit, the standard feeding amount of the rotary hearth furnace is set, the pellet feeding amount is fed back to a PLC (programmable logic controller) in real time by a metering belt scale, and the purpose of automatically controlling the pellet feeding amount is realized by the PLC, so that the pellet feeding amount is stably controlled, the sintering quality of the rotary hearth furnace is further improved, the pulverization rate is reduced, and the product quality and the product yield of the rotary hearth furnace are improved.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a rotary hearth furnace production system capable of controlling the feeding amount of pellets, which is sequentially provided with a preamble unit, a drying unit and a rotary hearth furnace unit, wherein a pellet storage and conveying unit is arranged between the drying unit and the rotary hearth furnace unit;
the pellet storage and conveying unit comprises a drying pellet bin and a pellet feeding amount control unit connected with the drying pellet bin; the ball drying bin is connected with a green ball dryer of the drying unit through a belt conveyor; the pellet feeding amount control unit is connected with the vibration distributing device of the rotary hearth furnace unit.
Preferably, the pellet charging amount control unit comprises a metering belt scale and a PLC (programmable logic controller) arranged on the metering belt scale;
the metering belt scale is connected with the discharge port of the drying ball bin, and the discharge port of the metering belt scale is connected with the vibration distributing device; the metering belt scale is used for weighing the feeding amount of the pellets entering the rotary hearth furnace unit in real time and outputting a signal to the PLC;
the PLC controller is connected with a driving motor of the metering belt scale through an electric signal.
Preferably, the PLC controller comprises a signal processing unit, a counting module, a PLC control unit, a driving unit and a motor control unit, wherein the signal processing unit is connected with a weighing sensor of the metering belt scale; the signal processing unit receives the output signal of the weighing sensor and feeds the output signal back to the counting module; the counting module is connected with the PLC control unit, the output signal of the PLC control unit is fed back to the driving unit, and the driving unit adjusts the motor frequency of the driving motor through the motor control unit to adjust the pellet feeding amount of the rotary hearth furnace unit.
Preferably, the PLC controller further includes a data processing display unit bidirectionally connected to the PLC control unit, and the data processing display unit receives and displays output information of the PLC control unit.
The utility model has the beneficial effects that: the pellet feeding amount control unit is added between the drying unit and the vibration distributor of the rotary hearth furnace, the pellet feeding amount is controlled by the pellet feeding amount control unit, the standard feeding amount of the rotary hearth furnace is set, the pellet feeding amount is fed back to the PLC in real time through the metering belt scale, and the purpose of automatically controlling the pellet feeding amount is achieved through the PLC, so that the pellet feeding amount is stably controlled, the sintering quality of the rotary hearth furnace is further improved, the pulverization rate is reduced, and the product quality and the product yield of the rotary hearth furnace are improved.
Drawings
FIG. 1 is a schematic diagram of a prior art rotary hearth furnace production system;
FIG. 2 is a schematic diagram of a rotary hearth furnace production system capable of controlling the amount of pellets fed into the furnace according to the present utility model;
FIG. 3 is a control schematic diagram of a rotary hearth furnace production system capable of controlling the amount of pellets fed into the furnace according to the present utility model;
FIG. 4 is a trend chart of the pellet charging amount of 15-23 days 1 month before the modification of the rotary hearth furnace production line in the embodiment 1 of the utility model;
FIG. 5 is a graph showing the tendency of pellets to be charged from 15 days to 23 days 4 months after the improvement of the rotary hearth furnace production line in example 1 of the present utility model.
Detailed Description
The technical scheme of the utility model is further described below with reference to the accompanying drawings and examples.
Referring to fig. 2, the utility model discloses a rotary hearth furnace production system capable of controlling the feeding amount of pellets, a drying pellet bin 6 is added in a drying unit 100 and a rotary hearth furnace unit 300, the dried pellets are stored in the drying pellet bin 6, a pellet feeding amount control unit is added at a discharging position of the drying pellet bin 6 to control the feeding amount of the pellets fed into a rotary hearth furnace 4, thereby realizing automatic control of the feeding amount, achieving the aim of stably controlling the feeding amount of the pellets, further improving the sintering quality of the rotary hearth furnace 4, reducing the pulverization rate of the pellets, and improving the product quality and the product yield of the rotary hearth furnace 4; the pellet storage and conveying unit 200 comprises a drying pellet bin 6 and a pellet charging amount control unit connected with the drying pellet bin 6; the drying ball bin 6 is connected with the green ball dryer 1 of the drying unit 100 through the belt conveyor 2; the pellet charge control unit is connected with the vibration distributor 3 of the rotary hearth furnace unit 300. In the rotary hearth furnace production system, after the raw materials are dried in the dryer of the drying unit 100, the pellets obtained after being processed by the preamble unit enter the drying ball bin 6 for temporary storage through the belt conveyor 2, then the pellet charging amount entering the rotary hearth furnace 4 is obtained and controlled through the pellet charging amount control unit, and when the pellet charging amount is lower than or exceeds the set weight range of the pellet charging amount control unit, the pellet charging amount is increased or decreased through the pellet charging amount control unit so as to achieve the purpose of stably controlling the pellet charging amount.
Referring to fig. 2, the pellet charging amount control unit includes a metering belt scale 7 and a PLC controller 8 provided on the metering belt scale 7; the weighing belt scale 7 is used for weighing the dried pellets from the drying pellet bin 6 and conveying the pellets to the vibration distributor 3 of the rotary hearth furnace unit 300, the weighing belt scale 7 is connected with a discharge port of the drying pellet bin 6, and a discharge port of the weighing belt scale 7 is connected with the vibration distributor 3; the weighing sensor 9 is arranged on the metering belt scale 7, the metering belt scale 7 conveys the dried pellets from the drying pellet bin 6 to the vibration distributing device 3 of the rotary hearth furnace unit 300 through a driving motor, can weigh the pellet feeding amount entering the rotary hearth furnace unit 300 in real time, and outputs a signal to the PLC 8; the PLC controller 8 is connected with a driving motor of the metering belt scale 7 through an electric signal. When the pellet charge amount is lower than or exceeds the set weight range of the pellet charge amount control unit, the PLC controller 8 adjusts the rotation speed of the driving motor by increasing or decreasing the motor frequency of the driving motor, thereby adjusting the transmission speed of the pellets into the rotary hearth furnace unit 300, and further controlling the pellet charge amount into the rotary hearth furnace unit 300 within the set weight range.
As shown in fig. 2 and 3, the PLC controller 8 includes a signal processing unit 10 connected to the weighing sensor 9 of the weighing belt scale 7, a counting module 11, a PLC control unit 12, a driving unit 14, and a motor control unit 15 connected to the driving unit 14; the signal processing unit 10 receives the analog signal output by the weighing sensor 9 and feeds the analog signal back to the counting module 11; the counting module 11 is connected with the PLC control unit 12, the PLC control unit 12 outputs a signal to feed back to the driving unit 14, and the driving unit 14 adjusts the frequency of a motor of the driving motor through the motor control unit 15 to adjust the feeding amount of pellets entering the rotary hearth furnace unit 300. The analog signal output by the weighing sensor 9 is processed by the signal processing unit 10 and then enters the counting module 11, and then is analyzed and calculated by the PLC control unit 12, the monitored quantity of the pellet entering amount is compared with the set weight range set in the PLC control unit 12, wherein the set weight range is divided into an upper limit value and a lower limit value, the upper limit value is set to 35 tons/hour, the lower limit value is set to 30 tons/hour, when the monitored quantity of the pellet entering amount is more than the upper limit value, the PLC control unit 12 outputs a signal to the driving unit 14, the driving unit 14 reduces the motor frequency of the driving motor of the metering belt scale 7 through the motor control unit 15, slows down the transmission speed of the pellet entering into the rotary hearth furnace unit 300, prolongs the time of the pellet entering into the rotary hearth furnace unit 300, and accordingly reduces the pellet entering amount; when the monitored quantity of the pellet charging quantity is less than the lower limit value, the PLC control unit 12 outputs a signal to the driving unit 14, the driving unit 14 increases the motor frequency of the driving motor of the metering belt scale 7 through the motor control unit 15, the transmission speed of the pellet entering the rotary hearth furnace unit 300 is increased, the time of the pellet entering the rotary hearth furnace unit 300 is reduced, and the pellet charging quantity is increased.
In a specific embodiment, as shown in fig. 3, the PLC controller 8 further includes a data processing display unit 13 bi-directionally connected to the PLC control unit 12, where the data processing display unit 13 receives and displays output information of the PLC control unit 12, so that data such as the amount of pellets charged into the furnace is conveniently displayed in the data processing display unit 13, so as to track the operation condition.
The rotary hearth furnace production system capable of controlling the feeding amount of pellets according to the utility model is further described below by referring to specific examples;
example 1
In the embodiment, the rotary hearth furnace production system for controlling the furnace feeding amount of the pellets is adopted to modify a certain rotary hearth furnace production line, wherein in the aspect of furnace feeding amount control, before modification: the pellet charging amount is controlled to be 25-37 tons/hour, and the fluctuation is large; actual data of the pellet charging amount of 1 month 15 days to 23 days are shown in table 1, and a trend chart of the pellet charging amount of 1 month 15 days to 23 days is shown in fig. 4; after transformation: the feeding amount of the pellets is controlled to be 31-33 tons/hour, and the flow is stable; actual data of the pellet charging amount of 4 months 15 days to 23 days are shown in table 2, and a trend chart of the pellet charging amount of 4 months 15 days to 23 days is shown in fig. 5;
table 1 pellet charge before modification
TABLE 2 pellet charge after modification
With reference to tables 1 and 2 and fig. 4 and 5, the furnace charge before transformation is 25-37 tons/hour, the furnace charge is unstable and has large fluctuation, and the furnace charge is basically stable and has small fluctuation after the rotary hearth furnace production system for controlling the pellet furnace charge is transformed.
Example 2
In the embodiment, the rotary hearth furnace production system for controlling the feeding amount of the pellets is adopted to reform a certain rotary hearth furnace production line, and the pulverization rate index is influenced before and after reforming: before transformation, the pulverization rate is 28-30%, the average pulverization rate is 29%, and the pulverization is higher; the actual data of the pulverization rate of 15 to 23 days 1 month are shown in Table 3. After transformation: the pulverization rate is 22-25%, the average pulverization rate is 24%, the pulverization rate is obviously reduced, and the average pulverization rate is reduced by about 5%; the actual data of the pulverization rate of 15 to 23 days 4 months are shown in Table 4.
TABLE 3 powdering Rate before transformation
TABLE 4 powdering Rate after transformation
The pulverization rate before transformation is 28-30% as shown in tables 3 and 4, and the pulverization rate is obviously reduced after the transformation of the rotary hearth furnace production system for controlling the feeding amount of pellets is adopted.
In summary, according to the rotary hearth furnace production system capable of controlling the pellet feeding amount, the pellet feeding amount control unit is added between the drying unit and the vibration distributor of the rotary hearth furnace, the pellet feeding amount is controlled through the pellet feeding amount control unit, the standard feeding amount of the rotary hearth furnace is set, the pellet feeding amount is fed back to the PLC in real time through the metering belt scale, and the purpose of automatically controlling the pellet feeding amount is achieved through the PLC, so that the pellet feeding amount is stably controlled, the sintering quality of the rotary hearth furnace is improved, the pulverization rate is reduced, and the product quality and the product yield of the rotary hearth furnace are improved.
It will be appreciated by persons skilled in the art that the above embodiments are provided for illustration only and not for limitation of the utility model, and that variations and modifications of the above described embodiments are intended to fall within the scope of the claims of the utility model as long as they fall within the true spirit of the utility model.
Claims (4)
1. The rotary hearth furnace production system capable of controlling the feeding amount of the pellets is characterized in that a preamble unit, a drying unit and a rotary hearth furnace unit are sequentially arranged on the rotary hearth furnace production system, and a pellet storage and conveying unit is further arranged between the drying unit and the rotary hearth furnace unit;
the pellet storage and conveying unit comprises a drying pellet bin and a pellet feeding amount control unit connected with the drying pellet bin; the ball drying bin is connected with a green ball dryer of the drying unit through a belt conveyor; the pellet feeding amount control unit is connected with the vibration distributing device of the rotary hearth furnace unit.
2. The rotary hearth furnace production system capable of controlling the feeding amount of pellets according to claim 1, wherein the pellet feeding amount control unit comprises a metering belt scale and a PLC (programmable logic controller) arranged on the metering belt scale;
the metering belt scale is connected with the discharge port of the drying ball bin, and the discharge port of the metering belt scale is connected with the vibration distributing device; the metering belt scale is used for weighing the feeding amount of the pellets entering the rotary hearth furnace unit in real time and outputting a signal to the PLC;
the PLC controller is connected with a driving motor of the metering belt scale through an electric signal.
3. The rotary hearth furnace production system capable of controlling the feeding amount of pellets according to claim 2, wherein the PLC controller comprises a signal processing unit, a counting module, a PLC control unit, a driving unit and a motor control unit, wherein the signal processing unit, the counting module, the PLC control unit and the motor control unit are connected with a weighing sensor of the metering belt scale; the signal processing unit receives the output signal of the weighing sensor and feeds the output signal back to the counting module; the counting module is connected with the PLC control unit, the output signal of the PLC control unit is fed back to the driving unit, and the driving unit adjusts the motor frequency of the driving motor through the motor control unit to adjust the pellet feeding amount of the rotary hearth furnace unit.
4. The rotary hearth furnace production system capable of controlling the feeding amount of pellets according to claim 3, wherein the PLC controller further comprises a data processing display unit bidirectionally connected with the PLC control unit, and the data processing display unit receives and displays the output information of the PLC control unit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221217669.2U CN218994088U (en) | 2022-05-20 | 2022-05-20 | Rotary hearth furnace production system capable of controlling pellet feeding amount |
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| CN202221217669.2U CN218994088U (en) | 2022-05-20 | 2022-05-20 | Rotary hearth furnace production system capable of controlling pellet feeding amount |
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