CN-122018415-A - Automatic control system of annular lump ore dryer

CN122018415ACN 122018415 ACN122018415 ACN 122018415ACN-122018415-A

Abstract

The invention relates to an automatic control system of an annular lump ore dryer, which comprises a lump ore feeding buffer bin, an adjustable hydraulic baffle for adjusting the opening of a gate of the feeding buffer bin, a plurality of belt conveyors, an electronic balance of the belt conveyors, a high-temperature flue gas air pipe, an electromagnetic valve for controlling high-temperature flue gas flow, a front thermometer for measuring the flue gas temperature at a high-temperature flue gas inlet of the dryer, a flow monitor for measuring the flue gas flow at the high-temperature flue gas inlet of the dryer, an annular dryer, a thermometer for measuring the internal temperature of the annular dryer, a scanner for measuring the thickness of a lump ore material layer, a rear thermometer for measuring the flue gas temperature at a high-temperature flue gas outlet of the dryer, a high-temperature flue gas outlet and a PLC control system.

Inventors

WANG WEI
WANG ZHENGQIANG
JIA FANGJUN

Assignees

南京宝地梅山产城发展有限公司
上海梅山钢铁股份有限公司

Dates

Publication Date: 20260512
Application Date: 20241112

Claims (9)

1. The automatic control system of the annular lump ore dryer is characterized by comprising a lump ore feeding buffer bin, an adjustable hydraulic baffle for adjusting the opening degree of a gate of the feeding buffer bin, a plurality of belt conveyors, a belt conveyor electronic scale, a high-temperature flue gas air pipe, an electromagnetic valve for controlling the flow of high-temperature flue gas, a front thermometer for measuring the temperature of the flue gas at a high-temperature flue gas inlet of the dryer, a flow monitor for measuring the flow of the flue gas at the high-temperature flue gas inlet of the dryer, an annular dryer, a thermometer for measuring the internal temperature of the annular dryer, a scanner for measuring the thickness of a lump ore material layer, a rear thermometer for measuring the temperature of the flue gas at a high-temperature flue gas outlet of the dryer, a high-temperature flue gas outlet and a PLC control system; The adjustable hydraulic baffle for adjusting the opening degree of the gate is arranged at the bin opening of the lump ore feeding buffering bin, materials in the bin fall to the belt conveyor after the gate is opened, the materials are transported to the dryer through the belt conveyor, the belt conveyor electronic scale is arranged at the belt head pulley, the front thermometer is arranged at the high-temperature flue gas inlet of the dryer, the rear thermometer is arranged at the high-temperature flue gas outlet, the scanner for measuring the thickness of the lump ore material layer is arranged at the upper cover plate of the dryer after the material level is stable, and the electromagnetic valve for controlling the flow of the high-temperature flue gas is arranged on a pipeline for inputting the high-temperature flue gas.
2. The automatic control system of an annular lump ore dryer as set forth in claim 1, wherein the control method is as follows: Step 1, starting the process of the belt conveyor, starting the loop-type dryer trolley, Step 2, high-temperature flue gas with certain flow and fixed temperature is introduced, the ring dryer begins to preheat, Step 3, after time delay, a thermometer for measuring the internal temperature of the annular dryer feeds back the internal temperature T1 of the annular dryer until the temperature reaches the requirement of a discharging process, Step 4, opening an adjustable hydraulic baffle at the outlet of the lump ore surge bin to a certain opening degree, starting discharging lump ore and entering the ring dryer, step 5, after time delay, monitoring temperature difference delta T by two thermometers for measuring the temperature of flue gas at the inlet and the temperature difference delta T at the outlet of high-temperature flue gas of the dryer, automatically judging whether the delta T is qualified or not by a PLC according to the delta T standard range input in the earlier stage, returning to the step 4 if the delta T is qualified, entering the next step if the delta T is unqualified, Step 6, feeding back the high-temperature flue gas input flow by a flow monitor for measuring the flue gas flow at the inlet of the high-temperature flue gas of the dryer, judging whether the inlet flue gas flow is qualified according to the flow qualification range input in advance by the PLC system, if so, entering the next step, if not, increasing the opening L1 of an electromagnetic valve for controlling the high-temperature flue gas flow, and returning to the step 6 again, Step 7, a scanner for measuring the thickness of the lump ore material layer feeds back the thickness of the lump ore material layer like a PLC system, judges whether the thickness H of the lump ore material layer is qualified, if so, the rotating speed r of the ring dryer is increased, the thickness of the lump ore material layer is reduced, the heating effect of the lump ore is improved, and the step 5 is returned, if not, the next step is carried out, Step 8, feeding back the layer thickness H of the lump ore material by a scanner for measuring the layer thickness of the lump ore material, automatically judging whether the H is qualified or not by a PLC according to the standard range of the layer thickness value H input in the earlier stage, if the H is qualified, lifting the rotating speed r of a trolley of a dryer, reducing the layer thickness to lift the heating effect of the lump ore material and returning to the step 5, if the H is not qualified, adjusting the opening L of a gate of a buffer bin, and returning to the step 5 after time delay, And 9, stopping discharging and shutting down after the operation is completed.
3. The automatic control system of the annular lump ore dryer as set forth in claim 2, wherein in the step 2, the high-temperature flue gas temperature is 260 ℃, the initial flow rate of the flue gas is 50000m 3 /min, and the annular dryer starts preheating.
4. The automatic control system of the annular lump ore dryer as set forth in claim 2, wherein in the step 3, the internal temperature T1 of the annular dryer is 120-130 ℃ in conformity with the process requirements.
5. The automatic control system of an annular lump ore dryer as set forth in claim 2, wherein in step 4, the opening degree of the lump ore surge bin outlet is adjusted to 220mm.
6. The automatic control system of an endless lump ore dryer as set forth in claim 2, wherein the difference Δt between the two is set to 170-185 ℃ in step 5.
7. The automatic control system of an annular lump ore dryer as set forth in claim 2, wherein the flow rate of the high temperature flue gas is set to 100000m 3 /min-110000m 3 /min in step 6.
8. The automatic control system of an annular lump ore dryer as set forth in claim 2, wherein the layer thickness H is set to 120mm to 150mm in step 7.
9. The automatic control system of an annular lump ore dryer as set forth in claim 2, wherein in the step 8, the lump ore flow rate Q is set to be 400t/h to 500t/h, the trolley rotation speed r is set to be 18 °/min to 22 °/min, and the surge bin gate opening degree L is set to be 180mm to 220mm.

Description

Automatic control system of annular lump ore dryer Technical Field The invention relates to a control system, in particular to an automatic control system of an annular lump ore dryer, and belongs to the technical field of iron-making control systems. Background Lump ore is one of main raw materials for blast furnace ironmaking, and the lower the powder content is, the more favorable the blast furnace production is. In order to improve the screening effect of lump ore, the proportion of the powder of the lump ore after screening is reduced, and a plurality of domestic iron and steel enterprises dry and heat the lump ore before screening the lump ore, so that the purposes of reducing the moisture content of the lump ore and improving the screening effect are achieved. Because lump ore is conveyed into the dryer through the belt, the lump ore is unevenly distributed on the trolley of the dryer, and the drying effect is affected. If the block ore is paved by the material leveling mechanism, the block ore is easy to block, the abrasion is quick, and more manpower is required to be input for maintenance. Increasing the temperature or flow of the flue gas improves the drying effect, so that energy waste and overhigh temperature of the discharged flue gas can be caused, and the dust removal cloth bag is ignited. Therefore, a new solution is urgently needed to solve the technical problem. Disclosure of Invention The invention provides an automatic control system of an annular lump ore dryer, which aims at the technical problems in the prior art, and in the annular lump ore dryer, the drying effect of lump ores is influenced by a plurality of factors such as the moisture content of the lump ores before drying, the flow and the temperature of high-temperature flue gas, the thickness of a lump ore layer, the ambient temperature and the like. According to the invention, the parameters such as the thickness of the material layer, the rotating speed of the trolley of the annular dryer, the temperature of the flue gas, the opening of the buffer bin and the like are automatically adjusted by the PLC system, so that the temperature difference of high-temperature flue gas before and after drying the lump ore is stabilized within the range of process requirements, and the aim of easy screening after drying the lump ore is fulfilled. In order to achieve the aim, the technical scheme is that the automatic control system of the annular lump ore dryer is characterized by comprising a lump ore feeding buffer bin, an adjustable hydraulic baffle for adjusting the opening of a gate of the feeding buffer bin, a plurality of belt conveyors, an electronic balance of the belt conveyors, a high-temperature flue gas air pipe and an electromagnetic valve for controlling the flow rate of high-temperature flue gas, a front thermometer for measuring the flue gas temperature at a high-temperature flue gas inlet of the dryer, a flow monitor for measuring the flue gas flow rate at the high-temperature flue gas inlet of the dryer, an annular dryer, a thermometer for measuring the internal temperature of the annular dryer, a scanner for measuring the thickness of a lump ore layer, a rear thermometer for measuring the flue gas temperature at a high-temperature flue gas outlet of the dryer, a high-temperature flue gas outlet and a PLC control system, wherein the hydraulic baffle for adjusting the opening of the gate is arranged at the gate of the lump ore feeding buffer bin, material in the bin falls to the belt conveyors after the gate is opened, the material is transported to the dryer through the belt conveyors, the electronic balance of the belt conveyors is arranged at the head pulley of the belt conveyors, the front thermometer is arranged at the high-temperature flue gas inlet of the dryer, the thermometer is arranged at the rear thermometer for measuring the high-temperature flue gas inlet of the dryer, the scanner is arranged at the high-temperature outlet of the high-temperature layer, the scanner is arranged at the high-temperature flue gas temperature control pipeline, and is arranged at the position of the high-temperature control pipeline, and is used for the flue gas temperature control device is arranged at the high-level and is arranged at the high temperature scanner. An automatic control system of an annular lump ore dryer comprises the following control methods: Step 1, starting the process of the belt conveyor, starting the loop-type dryer trolley, Step 2, high-temperature flue gas with certain flow and fixed temperature is introduced, the ring dryer begins to preheat, Step 3, after time delay, a thermometer for measuring the internal temperature of the annular dryer feeds back the internal temperature T1 of the annular dryer until the temperature reaches the requirement of a discharging process, Step 4, opening an adjustable hydraulic baffle at the outlet of the lump ore surge bin to a certain opening degree, starting dischargin