CN205057041U - Molten iron pretreatment is stained with and attaches formula dross removal mechanism - Google Patents

Abstract

The utility model relates to an attachment type slag removal device for molten iron pretreatment, which comprises a slag-sticking plate, a rotary mechanism, a lifting mechanism, a water cooling system and a slag-cleaning device. The slag-sticking plate is fixed on the rotary mechanism through the lifting mechanism, The mechanism drives to rotate between the slag removal position and the slag removal position. The slag staining tray is also connected to the water cooling system, and the slag removal device is set above the slag tray at the slag removal position. The slag cleaning device is composed of multiple high-pressure water guns and multiple mechanical air shovels, which are arranged alternately along the circumferential direction. The slag staining tray is provided with a temperature measuring device, specifically a plurality of thermocouples. The utility model adopts the attachment type slag removal method, and utilizes the characteristics of light specific gravity and fast cooling speed of desulfurization slag to make it solidify rapidly under the chilling condition and adhere to the slag staining plate, and then clean the slag staining plate; It has the characteristics of high slag removal rate, small iron loss and high slag removal efficiency; the device has a simple structure, is easy to realize, works reliably, and can realize automatic control.

Description

A kind of molten iron pretreatment adhesion type slag removal device

technical field

The utility model relates to the technical field of molten iron refining, in particular to an attachment type slag removal device for molten iron pretreatment.

Background technique

Hot metal pretreatment is of great significance to improve the quality of molten steel and expand varieties. Hot metal desulfurization is one of the important means of hot metal pretreatment, and the quality of molten iron will be greatly improved after desulfurization. However, the sulfur content of iron slag after hot metal desulfurization treatment is very high, which is very harmful to the steelmaking process and quality. If this part of iron slag with higher sulfur content enters the steelmaking furnace, the amount of lime will be increased, and sulfur may also enter the molten steel from the slag, so that the effect of desulfurization pretreatment of molten iron will be significantly reduced. Therefore, after the pretreatment of molten iron, it is necessary to increase the slag removal process to remove the sulfur-containing solid slag on the surface of the molten iron. Especially for smelting molten iron of low-sulfur steel grades and steel mills that realize less slag smelting operations, it is particularly important to remove slag from molten iron.

At present, the molten iron slag removal methods mainly include mechanical slag removal method, slag removal method, slag dumping method, slag skimming method, vacuum slag suction method and slag retaining plate slag retaining method, etc. Among them, the mechanical slag removal method is widely adopted by iron and steel enterprises because of its advantages of high slag removal efficiency, simple equipment, and easy operation. Put into the slag tray. However, due to the movement of the slag removal device on the molten iron surface in this kind of slag removal process, wave-making driving force and friction driving force will be generated on the molten iron, so as the slag is removed, the molten iron must also be taken out. The immersion depth of the slag removal plate is visually measured. It is impossible to ensure that the immersion depth of the slag removal board is consistent with the thickness of the slag layer, and the thickness of the slag layer is also different in each part. If the board is immersed deeply, the molten iron will be pulled out directly. In order to remove the solid slag, the depth of slag removal is generally greater than the thickness of the slag layer, so it is inevitable to carry out molten iron during slag removal. The scraped slag can often condense into lumps, indicating that there is a lot of iron in the slag.

The Chinese patent with application number 200710015162.2 (application date is July 30, 2007) discloses a "air-blowing and slag removal device through narrow slits of molten iron tanks and its operating process". The mechanical arm composed of the hydraulic cylinder and the second hydraulic cylinder, the first horn and the second horn, and movable joints. The mechanical arm is equipped with a blowpipe, and the blowpipe is equipped with a gas connection pipe and a nozzle. The nozzle is a narrow slit nozzle. The operation process is: first connect the gas connecting pipe to the nitrogen pipe or the air compressor; tilt the molten iron tank at a certain angle at the slag removal position, and adjust the narrow slit nozzle and the slag surface of the molten iron tank by the variable amplitude mechanical arm Then spray nitrogen or compressed air on the slag surface through a narrow slit nozzle to drive the liquid slag out of the mouth of the molten iron tank. The method has the advantages of high slag removal rate, low labor intensity and little environmental pollution. The slag removal process is a molten iron pretreatment slag removal process that combines pneumatic slag removal and slag removal. It is based on the mechanical slag removal method with gas slag removal. The upper slag layer will quickly cool down and crust due to the injection of gas. , resulting in a low rate of gas slag removal and slag removal, and the solid slag that cannot overflow automatically still needs to be removed with a slag removal board, so the problems of the mechanical slag removal method cannot be avoided.

Utility model content

The utility model provides an attachment type slag removal device for molten iron pretreatment, adopts the attachment type slag removal method, utilizes the characteristics of light specific gravity and fast cooling speed of desulfurization slag, so that it can be rapidly solidified and attached to the It has the characteristics of high slag removal rate, small iron loss and high slag removal efficiency; the device has a simple structure, is easy to implement, reliable in operation, and can realize automatic control.

In order to achieve the above object, the utility model adopts the following technical solutions to realize:

An attachment-type slag removal device for molten iron pretreatment, including a slag-sticking tray, a rotary mechanism, a lifting mechanism, a water cooling system, and a slag-cleaning device. Rotate between the slag position and the slag cleaning position, the slag staining tray is additionally connected to the water cooling system, and the slag cleaning device is set above the slag tray at the slag cleaning position.

The middle part of the slewing mechanism is supported by the base, and one slag-staining tray is provided on the extension arms at both ends, and the 2 slag-staining trays are respectively connected to the water cooling system, and an independent lifting mechanism is provided.

The slag cleaning device is composed of a plurality of high-pressure water guns and a plurality of mechanical air shovels, and the high-pressure water guns and mechanical air shovels are arranged alternately along the circumferential direction.

The slag staining tray is provided with a temperature measuring device, specifically a plurality of thermocouples.

The slag staining tray, rotary mechanism, lifting mechanism, water cooling system and slag removal device are respectively connected to the PLC control system, wherein the temperature measuring device on the slag staining tray is connected to the input end of the PLC, and the rotary mechanism, lifting mechanism, water cooling system and slag removal device are connected to the PLC control system. The driving part of the device is respectively connected to the output terminals of the PLC.

Compared with the prior art, the beneficial effects of the utility model are:

1) According to the difference between the physical properties of desulfurization slag and molten iron, the desulfurization slag has light specific gravity, fast cooling speed, and rapid solidification under chilling conditions to carry out adhesion-type slag removal. The principle and method are completely different from the existing molten iron removal. slag method;

2) The slag staining tray is equipped with a water cooling system, which can quickly cool and solidify the desulfurization slag into a slag cake and adhere to the slag staining tray. The slag cake is broken by a high-pressure water gun and a mechanical wind shovel, and the broken hot metal desulfurization slag is discharged on the slag It is recycled and reused in the plate, and the molten iron will not be entrained during the slag removal process, so the iron loss is small;

3) Two sets of slag-staining devices can be set up to carry out slag-staining and slag-cleaning operations in turn, and the rotary alternate operation can be easily realized through the rotary mechanism. The structure of the device is simple and compact, and the floor space is small; The dipping slag removal method is flexible and convenient to operate, and the slag removal efficiency is high;

4) A temperature measurement system is installed on the slag staining tray, which can monitor temperature changes in real time and accurately control the immersion depth of the slag staining tray. The molten slag after desulfurization can be removed quickly and accurately, and the slag removal rate is high;

5) The whole process can be automatically controlled by connecting with PLC, with a high degree of automation, ensuring the effect of slag removal and reducing labor intensity.

Description of drawings

Fig. 1 is the structural representation of the utility model.

In the figure: 1. Rotary mechanism 2. Base 3. Lifting mechanism 4. Water cooling system 5. Slag staining plate 6. Temperature measuring device 7. Hot metal tank 8. Hot metal tank car 9. Mechanical air shovel 10. Slag pan 11. High pressure water gun 12 .Molten iron 13.Slag layer

detailed description

The specific embodiment of the utility model will be further described below in conjunction with accompanying drawing:

See Fig. 1, which is a structural schematic diagram of the utility model. The utility model is a molten iron pretreatment attachment type slag removal device, which includes a slag staining tray 5, a rotary mechanism 1, a lifting mechanism 3, a water cooling system 4 and a slag removal device. The slag staining plate 5 is fixed on the rotary mechanism 1 through the lifting mechanism 3, and is driven by the rotary mechanism 1 to rotate between the slag removal position and the slag cleaning position. The top of the slag pan 10 of the bit.

The middle part of the slewing mechanism 1 is supported by the base 2, and one slag-staining tray 5 is provided on each extending arm at both ends.

The slag cleaning device is composed of multiple high-pressure water guns 11 and multiple mechanical air shovels 9, and the high-pressure water guns 11 and mechanical air shovels 9 are arranged alternately along the circumferential direction.

The slag staining tray 5 is provided with a temperature measuring device 6, specifically a plurality of thermocouples.

The slag staining tray 5, the rotary mechanism 1, the lifting mechanism 3, the water cooling system 4 and the slag cleaning device are respectively connected to the PLC control system, wherein the temperature measuring device 6 on the slag staining tray 5 is connected to the input end of the PLC, and the rotary mechanism 1, the lifting mechanism The mechanism 3, the water cooling system 4 and the driving part of the slag cleaning device are respectively connected to the output ends of the PLC.

In the utility model, the rotary mechanism 1 is fixed on the base 2, and the rotary action in the horizontal direction is realized through the driving and transmission device; Connect the slag-staining tray 5, and when two slag-staining trays 5 are used, the rotary mechanism 1 is provided with two-way symmetrical extension arms, and connects the slag-staining tray 5 through the independent lifting mechanism 3 . The lifting mechanism 3 can adopt the screw drive mode, and is respectively driven by the corresponding motor to realize the lifting action. That is to say, the two slag-staining trays share a water cooling system and a slewing mechanism, and have their own independent lifting mechanisms. The slag-staining and slag-cleaning operations of the two slag-staining trays are carried out alternately.

The shape of the slag staining tray 5 is consistent with the shape of the mouth of the molten iron tank 7, and its diameter is 80% to 90% of the diameter of the mouth of the molten iron tank. The slag staining plate 5 adopts a hollow plate structure, on which a water inlet and a water outlet are respectively connected to the water inlet pipe and the water outlet pipe of the water cooling system 4, and a circulating cooling water channel is provided in the slag staining plate 5 to perform circulating water cooling on the slag staining plate 5, The pressure of the cooling water is 0.5-1.0 MPa, the water inlet pipe and the water outlet pipe adopt hoses, and the rotary mechanism 1 rotates reciprocally within the range of 180°.

4 to 8 thermocouples are evenly arranged on each slag-staining tray 5 along the circumferential direction to monitor the temperature. Generally, the temperature of the molten iron 12 is about 1400°C, and the temperature of the slag layer 13 is about 20°C lower than the temperature of the molten iron 12. The monitoring of the temperature can determine whether the depth of the slag staining tray 5 is the molten iron 12 or the slag layer 13, so that the slag staining tray 5 can be accurately positioned in the slag layer 13 for quick slag staining operation. There is a protective device on the outer layer of the thermocouple, which is a commercially available product as a whole, and its structure will not be described here.

A slag pan 10 is set at the slag cleaning position to collect the desulfurization slag cleaned from the slag staining pan 5, and 4 to 6 high-pressure water guns 11 and 2 to 4 mechanical air shovels 9 are respectively set above the slag pan 10, which can be evenly distributed along the circumferential direction. , Alternately set, thereby guaranteeing that all directions of the slag-smearing tray 5 can be cleaned evenly.

After the utility model is connected by PLC, it can realize the automatic control of the whole process of slag removal operation, and control the immersion depth of the slag-sticking plate 5 in the molten iron tank 7 and the water cooling system through the temperature signal input by the temperature measuring device 6 on the slag-sticking plate 5 . The cooling water flow rate is 4, through the pre-set program to realize the automatic control of the lifting of the slag tray 5, staying in the slag layer 13, reversing the position and cleaning the slag, which has a high degree of automation and can greatly reduce the labor intensity of the operator .

The working principle and operation process of a molten iron pretreatment attachment type slag removal device of the utility model are as follows:

The molten iron tank 7 containing the molten iron 12 after dusting and desulfurization is transported to the slag removal position by the molten iron tank car 8, and the lifting mechanism 3 is started to lower the slag staining plate 5 into the molten iron tank 7, and the water cooling system 4 passes the circulating cooling water to the slag removal position. The slag tray 5 is cooled; according to the temperature of the external medium fed back by the temperature measuring device 6 provided on the slag tray 5, the immersion depth of the slag tray 5 is controlled so that the slag tray 5 stays in the slag layer 13; Stay in the slag layer 13 for 60-120 seconds to carry out water cooling and slag dipping, so that the desulfurization slag is rapidly cooled and solidified into a slag cake and adhered to the slag staining plate 5, and then the lifting mechanism 3 is started to lift the slag staining plate 5 to the top of the molten iron tank 7 ;

Rotate the slag staining tray 5 with solid slag attached to the slag cleaning position through the rotary mechanism 1, and clean the solid slag on the slag staining tray 5. First, use high-pressure water gun 11 to perform high-pressure spraying treatment, and the processing time is 30-60 minutes. Seconds, if there is residue after spraying, adopt mechanical wind shovel 9 to process again, until the residue on the slag tray 5 is all cleaned up, and the cleaned solid slag is discharged into the slag tray 10;

Repeat the above-mentioned slag-staining and slag-cleaning processes until the desulfurization slag in the molten iron tank 7 is completely removed.

In the later stage of slag removal, when the amount of solid slag attached to the slag-staining tray 5 at one time decreases, after the slag-staining is completed and lifted to the top of the molten iron tank 7, the immersion depth can be re-determined to carry out multiple slag-staining operations, and then cleaning can be performed. Slag work.

The following examples are carried out on the premise of the technical solution of the utility model, and detailed implementation and specific operation process are provided, but the protection scope of the utility model is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.

【Example 1】

In the smelting laboratory, a "500kg multifunctional experimental furnace" was used to simulate the molten iron tank 7, and the attachment type slag removal device of the present utility model was used to carry out a slag removal experiment on the molten iron tank 7 with a capacity of 400 kg. The diameter of the slag pan 5 that is used is 80% of the diameter of the mouth of the molten iron tank 7, the cooling water pressure of the water cooling system 4 is 0.5MPa, and the temperature measurement system 6 is 4 thermocouples installed on the slag pan 5. 4 high-pressure water guns 11 and 4 mechanical wind shovels 9 are installed above the 10; adopt once to dip slag during the slag removal operation, and the slag-stick pan 5 stays in the slag layer 13 for 60 seconds, and the high-pressure water gun 11 spray processing time is In 30 seconds, the residue can be cleaned up without the need for a mechanical wind shovel 9 to remove the residue.

[Example 2]

In the smelting laboratory, a "500kg multifunctional experimental furnace" was used to simulate the molten iron tank 7, and the attachment type slag removal device of the present utility model was used to carry out a slag removal experiment on the molten iron tank 7 with a capacity of 400 kg. The diameter of the slag pan 5 that is used is 85% of the diameter of the 7 tank mouths of the molten iron tank, the cooling water pressure of the water cooling system 4 is 0.8MPa, and the temperature measurement system 6 is 6 thermocouples installed on the slag pan 5. 5 high-pressure water guns 11 and 3 mechanical air shovels 9 are installed above the 10; the slag removal operation adopts secondary slag dipping, and the slag-sticking tray 5 stays in the slag layer 13 for 90 seconds each time the slag is stained; 11 The spray treatment time is 45 seconds, and the remaining small amount of residue is cleaned by mechanical air shovel 9.

[Example 3]

In the smelting laboratory, a "500kg multifunctional experimental furnace" was used to simulate the molten iron tank 7, and the attachment type slag removal device of the present utility model was used to carry out a slag removal experiment on the molten iron tank 7 with a capacity of 400 kg. The diameter of the slag pan 5 that is used is 90% of the diameter of the mouth of the molten iron tank 7, the cooling water pressure of the water cooling system 4 is 1.0MPa, and the temperature measurement system 6 is 8 thermocouples installed on the slag pan 5, and the slag pan is installed on the slag pan. 6 high-pressure water guns 11 and 2 mechanical wind shovels 9 are installed above the 10; adopt once to dip slag during the slag removal operation, and the slag-stick pan 5 stays in the slag layer 13 for 120 seconds, and the high-pressure water gun 11 spraying treatment time is For 60 seconds, the remaining small amount of residue is cleaned by mechanical wind shovel 9.

In the above three embodiments, the slag removal rate is 90-96%, the average slag removal rate is 92.67%, the iron loss is 3-5kg/t iron, and the average iron loss is 4kg/t iron; the slag removal time is 5-7min, The average slag removal time is 6 minutes; compared with the conventional slag removal method, the slag removal rate is increased by more than 7%, the iron loss is reduced by 9kg/t iron, which is only about 31% of the iron loss of the conventional slag removal method, and the slag removal time is shortened by 3 minutes. It is only about 67% of the conventional slag removal method.

To sum up, the adoption of a hot metal pretreatment attachment type slag removal device of the present utility model has a greater improvement in the slag removal rate, iron loss, slag removal time and other indicators than the conventional slag removal method for molten iron. The utility model realizes a great innovative breakthrough of slag removal in molten iron pretreatment.

Claims (5)

1. A molten iron pretreatment attachment type slag removal device is characterized in that it comprises a slag tray, a rotary mechanism, a lifting mechanism, a water cooling system and a slag removal device, and the slag tray is fixed on the rotary mechanism by a lifting mechanism, Driven by the rotary mechanism to rotate between the slag removal position and the slag cleaning position, the slag staining tray is additionally connected to the water cooling system, and the slag cleaning device is set above the slag tray at the slag removal position. 2. A molten iron pretreatment adhesion type slag removal device according to claim 1, characterized in that, the middle part of the slewing mechanism is supported by a base, and one slag-sticking tray and two The slag staining trays are respectively connected with the water cooling system and equipped with an independent lifting mechanism. 3. A kind of molten iron pretreatment adhesion type slag removal device according to claim 1, characterized in that, the slag removal device is composed of a plurality of high-pressure water guns and a plurality of mechanical wind shovels, and the high-pressure water guns and mechanical wind shovels are The circumferential direction is arranged alternately. 4 . The molten iron pretreatment adhesion type slag removal device according to claim 1 , wherein a temperature measuring device, specifically a plurality of thermocouples, is provided on the slag staining plate. 5. A kind of molten iron pretreatment adhesion type slag removing device according to claim 1, is characterized in that, described slag staining plate, rotary mechanism, lifting mechanism, water cooling system and slag cleaning device are respectively connected with PLC control system, wherein The temperature measuring device on the slag staining tray is connected to the input end of the PLC, and the driving parts of the slewing mechanism, the lifting mechanism, the water cooling system and the slag cleaning device are respectively connected to the output end of the PLC.