CN218191429U

CN218191429U - Sintering system denitration draught fan with online ash removal function

Info

Publication number: CN218191429U
Application number: CN202222003058.4U
Authority: CN
Inventors: 秦生; 谷秀柱
Original assignee: Hebei Tianyue Laser Remanufacturing Technology Co ltd
Current assignee: Hebei Tianyue Laser Remanufacturing Technology Co ltd
Priority date: 2022-07-31
Filing date: 2022-07-31
Publication date: 2023-01-03
Anticipated expiration: 2032-07-31

Abstract

The utility model provides a sintering system denitration draught fan with online ash removal function, which comprises a fan main body, wherein a rotor impeller, an air inlet and an air outlet are arranged in the fan main body; an air outlet of the fan main body is provided with an induced air pipe, the tail end of the induced air pipe is connected with a dust remover, the outlet end of the dust remover is connected with an air supply pipe, the air supply pipe extends into the vicinity of the non-working surface of the impeller at the air inlet end, and the tail end of the air supply pipe is provided with a spray head pointing to the non-working surface of the impeller; valves which are independently controlled are respectively arranged on the induced air pipe and the blast pipe; and a direction changing mechanism for finely adjusting the blowing direction of the spray head is also arranged between the blast pipe and the spray head. The utility model discloses draw forth the high-pressure flue gas of one sintering system draught fan export, return draught fan air inlet port to the non-working face of rotor impeller and sweep after the dust remover removes dust, in time sweep the soft deposition that will adhere on the impeller, avoid the deposition scale deposit to ensure the balanced rotation of fan impeller, reduce the emergence of vibration phenomenon.

Description

Sintering system denitration draught fan with online ash removal function

Technical Field

The utility model relates to a draught fan technical field, in particular to sintering system denitration draught fan with online dusting function.

Background

The induced draft fan is the most common gas medium conveying device in a factory; in iron and steel enterprises, a sintering induced draft fan plays a very important role in the sintering process, and in the sintering process, due to the continuous rotation of an impeller of the induced draft fan, smoke of an air inlet continuously flows to an exhaust port through a flow channel between blades, so that the sintering process can be carried out. The operation condition of the draught fan not only directly influences the sintering yield, quality and cost, but also influences the stability of iron-making production and the exertion of blast furnace capacity. However, in the operation process of the induced draft fan, the phenomena of high vibration, easy damage of bearings and the like generally exist, the conveying air quantity and pressure of flue gas are influenced, frequent shutdown is needed for cleaning, and the normal production of sintering is severely restricted.

The reason that the induced draft fan vibrates highly is because of the unbalanced rotation of fan impeller, and the impeller is unbalanced and mostly is related to the dust collector effect poor that the induced draft fan connects in front. Although a dry-method electrostatic dust removal device is arranged at a sintering machine head of the company, flue gas needs to pass through devices such as wet-method desulfurization and de-whitening before entering a denitration device, so that the flue gas not only contains dust which is not removed by an electric dust remover, but also contains relatively large moisture, the dust and the moisture can gradually deposit on a relatively static non-working surface of an impeller to form an ash layer after entering the impeller, and the ash layer on the non-working surface of the impeller can reach about 30mm when being thickest; when the ash scale layer automatically falls off, the dynamic balance of the impeller is damaged, so that vibration is generated, the double-amplitude vibration value of the bearing reaches 0.3mm to 0.4mm, and in the worst case, the double-amplitude vibration value reaches 0.6mm to 0.8mm (the normal value is below 0.08 mm), and the 'runaway' accident can be caused if the double-amplitude vibration value is not timely processed. In order to avoid the situation, a factory has to frequently shut down the induced draft fan to carry out manual ash removal, and in severe cases, the induced draft fan needs to be cleaned 2-3 times per month, so that not only is serious economic loss caused, but also potential safety hazards are caused, and meanwhile, the maintenance workload of operators is greatly increased.

At present, the method for solving the impeller scaling mainly comprises the following two methods:

1. water spraying and descaling: the water spraying system is arranged on a shell of the induced draft fan, and the surface of the non-working surface of the impeller is washed by high-pressure ash flushing water, so that descaling can be finished; however, the method needs to be carried out in a shutdown state, the descaling efficiency is low, the shutdown descaling time is long, the descaling interval is short, frequent shutdown descaling is needed, and the normal operation of the induced draft fan is seriously influenced;

2. high-pressure gas descaling: the system adopts a purging structure similar to a water spraying system, and adopts a high-pressure air source to purge the surface of a non-working surface of the impeller; the method can remove the scale in the clearance of the normal shutdown of the induced draft fan, does not need to shutdown intentionally, and is more convenient, but the method needs to be provided with a high-pressure air source conveying system, and has high energy consumption.

Therefore, how to solve the scaling of the impeller of the induced draft fan in the non-stop state becomes a problem which needs to be improved urgently.

SUMMERY OF THE UTILITY MODEL

For solving the above-mentioned problem that prior art exists, the utility model aims to provide a sintering system denitration draught fan with online dusting function.

In order to solve the technical problem, the utility model discloses the technical scheme who adopts is:

a sintering system denitration induced draft fan with an online ash removal function comprises a fan main body, wherein a rotor impeller, an air inlet and an air outlet are arranged in the fan main body; an induced air pipe is connected to an air outlet of the fan main body, the tail end of the induced air pipe is connected with a dust remover, the outlet end of the dust remover is connected with an air supply pipe, the air supply pipe extends to the position close to the non-working surface of the impeller at the air inlet end, and a spray head pointing to the non-working surface of the impeller is mounted at the tail end of the air supply pipe; a direction changing mechanism for finely adjusting the blowing direction of the spray head is also arranged between the blast pipe and the spray head;

the direction changing mechanism comprises a fixed cylinder, an air supply hard tube, an air supply hose and a fluted disc, the center of the bottom of the fixed cylinder is fixedly connected with the air supply hard tube, the front end of the air supply hard tube is fixedly connected with the air supply hose, and the end part of the air supply hose is connected with a spray head; the side wall of the fixed cylinder is also provided with an air cavity for communicating the air supply pipe and the air supply hard pipe; a circle of racks are arranged at the front end of the inner wall of the fixed cylinder, and the fluted disc is meshed and connected with the racks; a through hole for the air supply hose to pass through is formed in the center of the fluted disc, the through hole is in a cone frustum shape with the gradually increased aperture along the airflow direction, and the small end of the through hole is in clearance fit with the air supply hose; an arc-shaped convex block is arranged in the through hole.

The utility model discloses a further improvement lies in: and the nozzle is provided with a plurality of air nozzles facing the direction of the non-working surface of the impeller.

The utility model discloses a further improvement lies in: the air jet is an inverted cone-shaped port with the caliber gradually reduced.

The utility model discloses a further improvement lies in: and the induced draft pipe and the blast pipe are respectively provided with an independently controlled valve.

The utility model discloses a further improvement lies in: and the fan impeller is sleeved outside the air supply hard pipe, and the fluted disc is in transmission connection with the fan impeller through a connecting rod.

The utility model discloses a further improvement lies in: and a bearing is arranged between the fan impeller and the outer wall of the air supply hard tube.

The utility model discloses a further improvement lies in: the outer wall of the fixed cylinder is also provided with an air inlet gap pointing to the fan impeller, the air inlet gap is communicated with the air supply pipe through an air supply branch pipe, and the fixed cylinder wall opposite to the air inlet gap is also provided with an air outlet gap.

Since the technical scheme is used, the utility model discloses the technological progress who gains is:

the utility model provides a sintering system denitration draught fan with online dusting function draws forth the high-pressure flue gas of one draught fan export, returns draught fan air inlet port after the dust remover removes dust and sweeps the non-working face of rotor impeller, and the soft deposition that will adhere on the impeller in time sweeps, avoids the deposition scale deposit to ensure fan impeller's balanced rotation, reduce the emergence of vibration phenomenon. After the induced draft fan of the utility model is actually operated, the dust deposition phenomenon is basically eliminated, and the dust removing effect is obvious; in the operation period of one year, the vibration phenomenon of the impeller basically disappears, and the large vibration bearing damage accident caused by dust deposition does not occur. The vibration value of the draught fan after running for one year is still kept within a normal range of 0.02mm to 0.04mm through determination, and after shutdown inspection, the fact that only scattered and thin sticky ash with the thickness of less than 1mm is arranged on an impeller of the draught fan is found, and the ash removal effect is obvious.

Because fan wheel is the dysmorphism mostly, and ordinary shower nozzle is carried out one-way sweeping and is very easily produced the dead angle, and dead angle scaling still can cause the vibration of fan, consequently, the utility model discloses introduced deviator between blast pipe and shower nozzle, can realize the constantly changing and the fine setting of shower nozzle jetting angle, the jetting scope covers whole impeller, effectively avoids the dead angle to produce.

The utility model adopts the high-pressure flue gas generated by the draught fan as the gas source, and further pressurizes the high-pressure gas through the shape of the gas jet in the nozzle, thus realizing effective purging of the non-working surface of the impeller without pressurizing operation or introducing other power sources; the rotating power of the fan impeller in the direction changing mechanism also adopts high-pressure purified gas, other power sources are not introduced, the whole ash cleaning process is clean and environment-friendly, the original induced draft fan is convenient to reform, and the induced draft fan is suitable for large-scale popularization.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention;

fig. 2 is a schematic top view of the present invention;

FIG. 3 is a schematic cross-sectional view of a direction changing mechanism;

FIG. 4 is a schematic structural view of a showerhead;

FIG. 5 is a schematic top view of a chainring;

FIG. 6 is a cross-sectional structural view of the chainring;

in the figure, 1, a fan main body, 2, a motor, 3, a foundation, 4, a main body support, 5, a coupler, 6, a motor support, 7, an induced draft pipe, 8, a dust remover, 9, an air supply pipe, 10, a spray head, 11, an air nozzle, 12, a direction changing mechanism, 12-1, a fixed cylinder, 12-2, an air supply hard pipe, 12-3, an air supply hose, 12-4, a fan impeller, 12-5, a fluted disc, 12-5-1, a through hole, 12-5-2, a lug, 12-6, a rack, 12-7, a connecting rod, 12-8, an air cavity, 12-9, an air inlet gap, 12-10, an air outlet gap, 13, a connecting support, 14, a valve, 15 and a branch air supply pipe are arranged.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings.

A denitration induced draft fan with an online ash removal function for a sintering system is shown in figures 1-6 and comprises a fan main body 1 and a motor 2, wherein the front end and the rear end of the fan main body 1 are fixed on a foundation 3 through main body supports 4, and an air inlet, an air outlet and a rotor impeller are arranged in the fan main body 1; the motor 2 is installed on a motor base through a motor support 6, the motor base is fixed on the foundation 3, a power output shaft of the motor is in transmission connection with an impeller main shaft of the fan main body 1 through a coupler 5, the motor drives a rotor impeller of the fan main body 1 to rotate, air is introduced from an air inlet and is sent out from an air outlet, and continuous air induction is achieved.

The air outlet of the fan main body 1 is provided with an induced air pipe 7, the tail end of the induced air pipe 7 is connected with the inlet end of a dust remover 8, the outlet end of the dust remover 8 is connected with an air supply pipe 9, the air supply pipe 9 extends into the impeller non-working surface of the air inlet end, the tail end of the air supply pipe 9 is provided with a spray head 10 pointing to the impeller non-working surface, and the length of the spray head 10 is not less than 1/2 of the length of the impeller. The nozzle 10 is provided with a plurality of air nozzles 11, and the air nozzles 11 face the direction of the non-working surface of the impeller. The smoke with a certain pressure head at the air outlet of the draught fan is led out by an induced air pipe 7, purified by a dust remover 8 and returned to the air inlet end of the fan main body 1, and pressurized by a nozzle and then sprayed onto the non-working surface of the fan impeller to form a flow field of an eddy area, so that soft deposition just adhered to the impeller is blown off, the deposition and scaling of the fan impeller are prevented from being thickened continuously, and the deposition and scaling of the fan impeller are avoided.

The dust remover 8 is preferably a cyclone dust remover, the inlet end of the cyclone dust remover is the inlet end of a spiral volute, and the flue gas spirally descends in the cyclone dust remover to fully separate dust and gas.

The nozzle 10 is as shown in fig. 4, the outlet end of the nozzle 10 is provided with a plurality of air nozzles 11 side by side, the air nozzles 11 are inverted cone-shaped ports with gradually reduced calibers, so that secondary pressurization of air flow can be effectively realized, and the soot blowing effect of a non-working surface of a blade surface is improved. The air jets 11 may be in one or more rows, and preferably in a plurality of rows; when there are a plurality of rows of the gas ejection ports 11, the gas ejection ports 11 of the adjacent rows are arranged alternately.

The induced draft tube 7 and the blast tube 9 are both provided with valves 14 which can be independently controlled.

A direction changing mechanism 12 is further arranged between the blast pipe 9 and the spray head 10, and the direction changing mechanism 12 is fixed on the main body support 4 through a connecting support 13 so as to realize fine adjustment of the high-speed clean air blowing direction and ensure that the non-working surface of the special-shaped impeller is fully blown. The direction changing mechanism 12 comprises a fixed cylinder 12-1, an air supply hard pipe 12-2, an air supply hose 12-3, a fan impeller 12-4 and a fluted disc 12-5, wherein one end of the fixed cylinder 12-1 is open, and one open end of the fixed cylinder points to the non-working surface of the fan impeller. An air supply hard pipe 12-2 is fixedly arranged in the center of the fixed cylinder 12-1, the front end of the air supply hard pipe 12-2 is fixedly connected with an air supply hose 12-3, and the end part of the air supply hose 12-3 is connected with a spray head 10. An air cavity 12-8 communicated with the air supply pipe 9 and the air supply hard pipe 12-2 is formed in the side wall of the fixed cylinder 12-1.

The fan impeller 12-4 is sleeved outside the air supply hard pipe 12-2, a ball bearing is arranged between the fan impeller 12-4 and the outer wall of the air supply hard pipe 12-2, and the fan impeller 12-4 can freely rotate along the air supply hard pipe 12-2. An air inlet gap 12-9 pointing to the fan impeller 12-4 is further formed in the outer wall of the fixed cylinder 12-1, the air inlet gap 12-9 is communicated with the air supply pipe 9 through an air supply branch pipe 15, an air outlet gap 12-10 is further formed in the wall of the fixed cylinder 12-1 on the side opposite to the air inlet gap 12-9, and one strand of high-speed clean air is blown to the fan impeller 12-4 through the air supply branch pipe 15 and the air inlet gap 12-9 in sequence, drives the fan impeller 12-4 to rotate and then flows out of the air outlet gap 12-10. The air supply branch pipe 15 is provided with an independently controlled valve 14.

A fluted disc 12-5 is arranged outside the air supply hose 12-3, a rack 12-6 meshed with the fluted disc 12-5 is arranged on the inner wall of the fixed cylinder 12-1 corresponding to the fluted disc 12-5, and the fluted disc 12-5 can rotate along the rack 12-6. The fluted disc 12-5 is in transmission connection with the fan impeller 12-4 through a connecting rod 12-7, and when the fan impeller 12-4 rotates, the fluted disc 12-5 is driven to rotate synchronously.

The center of the fluted disc 12-5 is provided with a through hole 12-5-1 for the air supply hose 12-3 to pass through, the through hole 12-5-1 is in a cone frustum shape with gradually increased aperture along the airflow direction, and the small end of the through hole 12-5-1 is in clearance fit with the air supply hose 12-3. An arc-shaped bump 12-5-2 is arranged in the through hole 12-5-1, the front end of the bump 12-5-2 extrudes the air supply hose 12-3, so that the air supply hose 12-3 deforms under stress and inclines towards the opposite side of the air supply hose, the nozzle 10 is driven to incline in an angle, and the blowing direction of the air nozzle changes. When the air supply hose 12-3 is stressed and inclined, the tapered side edge of the through hole 12-5-1 supports the tube body of the air supply hose 12-3, so that a bending dead angle is prevented from being excessively formed, and normal air supply of the air supply hose 12-3 is ensured.

In order to avoid the air supply hose 12-3 from being damaged by being squeezed by the lug 12-5-2, a rubber wear-resistant sleeve is sleeved outside the part of the air supply hose 12-3 close to the through hole 12-5-1.

Generally, the air supply hose 12-3 needs to penetrate through a shell at the air inlet end of the induced draft fan to enable the spray head 10 to be close to the non-working surface of the impeller; because the gaps between the shell and the impellers in the induced draft fans with different specifications are different in size, the direction changing mechanism 12 can be arranged in the shell or outside the shell according to the actual conditions of equipment, when the direction changing mechanism 12 is arranged outside the shell, the aperture of a through hole of the induced draft fan shell for the air supply hose 12-3 to pass through is relatively large, the situation that the swing of the air supply hose 12-3 is limited by the through hole of the shell is avoided, and the sufficient change of the injection angle of the nozzle 10 is ensured.

The utility model discloses a working process does:

when the draught fan operates, a smoke with certain pressure is led out from an air outlet of the draught fan and sent into a dust remover for purification and dust removal; high-speed clean air returns to the air inlet end of the fan main body through the blast pipe, is further pressurized through the spray head and then is sprayed to the non-working surface of the rotor impeller, soft accumulated dust adhered to the impeller is blown off in time, the accumulated dust is prevented from scaling, and online dust removal is realized.

In the ash cleaning process, high-speed clean air blows the wind wheel to rotate through the air inlet gap, and then drives the fluted disc to rotate. When the nozzle rotates, the lug extrudes the air supply hose to enable the air supply hose to incline towards the opposite side, so that the spraying direction of the nozzle is changed; along with the continuous rotation of fluted disc, the air supply hose drives the shower nozzle and inclines along circumference, through the continuous adjustment to the jetting direction, realizes the thorough deashing to special-shaped impeller non-working face.

The above mentioned is only the preferred embodiment of the present invention, and all the equivalent changes and modifications made according to the claims of the present invention should be included in the scope of the present invention.

Claims

1. The utility model provides a sintering system denitration draught fan with online dusting function which characterized in that: the fan comprises a fan main body (1), wherein a rotor impeller, an air inlet and an air outlet are arranged in the fan main body (1); an air outlet of the fan main body (1) is connected with an induced air pipe (7), the tail end of the induced air pipe (7) is connected with a dust remover (8), the outlet end of the dust remover (8) is connected with an air supply pipe (9), the air supply pipe (9) extends to the position close to the non-working surface of the impeller of the air inlet end, and the tail end of the air supply pipe (9) is provided with a spray head (10) pointing to the non-working surface of the impeller; a direction changing mechanism (12) for finely adjusting the blowing direction of the spray head (10) is also arranged between the blast pipe (9) and the spray head (10);

the direction changing mechanism (12) comprises a fixed cylinder (12-1), an air supply hard pipe (12-2), an air supply hose (12-3) and a fluted disc (12-5), the center of the bottom of the fixed cylinder (12-1) is fixedly connected with the air supply hard pipe (12-2), the front end of the air supply hard pipe (12-2) is fixedly connected with the air supply hose (12-3), and the end part of the air supply hose (12-3) is connected with the spray head (10); an air cavity (12-8) used for communicating the air supply pipe (9) and the air supply hard pipe (12-2) is further formed in the side wall of the fixed cylinder (12-1); a circle of racks (12-6) are arranged at the front end of the inner wall of the fixed cylinder (12-1), and the fluted disc (12-5) is meshed with the racks (12-6); a through hole (12-5-1) for an air supply hose (12-3) to pass through is formed in the center of the fluted disc (12-5), the through hole (12-5-1) is in a cone frustum shape with the aperture gradually enlarged along the airflow direction, and the small end of the through hole (12-5-1) is in clearance fit with the air supply hose (12-3); an arc-shaped bump (12-5-2) is arranged in the through hole (12-5-1).

2. The denitration induced draft fan with the online ash removal function for the sintering system of claim 1, which is characterized in that: a plurality of air nozzles (11) are formed in the sprayer (10), and the air nozzles (11) face the direction of the non-working face of the impeller.

3. The denitration induced draft fan with the online ash removal function for the sintering system, according to claim 2, is characterized in that: the air injection port (11) is an inverted cone-shaped port with the caliber gradually reduced.

4. The denitration induced draft fan with the online ash removal function for the sintering system, according to claim 1, is characterized in that: and independently controlled valves (14) are respectively arranged on the induced draft tube (7) and the air supply tube (9).

5. The denitration induced draft fan with the online ash removal function for the sintering system, according to claim 1, is characterized in that: a fan impeller (12-4) is sleeved outside the air supply hard pipe (12-2), and a bearing is arranged between the fan impeller (12-4) and the outer wall of the air supply hard pipe (12-2); the fluted disc (12-5) is in transmission connection with the fan impeller (12-4) through a connecting rod (12-7).

6. The denitration induced draft fan with the online ash removal function for the sintering system, according to claim 5, is characterized in that: an air inlet gap (12-9) pointing to the fan wheel (12-4) is further formed in the outer wall of the fixed cylinder (12-1), the air inlet gap (12-9) is communicated with the air supply pipe (9) through an air supply branch pipe (15), and an air outlet gap (12-10) is further formed in the wall of the fixed cylinder (12-1) on the side opposite to the air inlet gap (12-9).