CN111140547A - Online scale removal device of fan - Google Patents

Abstract

The invention discloses an online descaling device for a fan, which comprises sound wave equipment arranged on an online pipeline connected with the fan, wherein the sound wave equipment comprises a pressure reducing valve, a pressure switch, a first electromagnetic valve, a sound wave generator, a second electromagnetic valve and a horn which are sequentially connected, and the horn is arranged on the online pipeline and faces the inside of the online pipeline. According to the fan online descaling device provided by the invention, the sound wave generated by the device has the characteristics of wide frequency band, high power and no dead zone in action, and can effectively remove various scales at all positions in the fan.

Description

Online scale removal device of fan

Technical Field

The invention relates to a descaling device, in particular to an online descaling device for a fan.

Background

The fan is a driven fluid machine, can convert electric energy into mechanical energy, generates pressure through rotation of an impeller to convey gas, and is widely used for ventilation and air induction of industrial flue gas of boilers, industrial furnaces and the like.

In order to meet the policy requirements of flue gas emission, the dedusted industrial flue gas usually contains more water and smoke dust. The water in the flue gas makes the impeller in a wet state, and the salt in the deposit attached to the blade is dissolved in the water film to generate chemical corrosion on the surface of the blade and gradually permeate inwards, so that the corrosion pit on the surface of the blade is deepened, and the deposited ash scale is firmer in a root pit. Along with the flowing of coal gas, tiny particles in the coal gas can generate charged particles through collision friction, when the coal gas meets blades running at a high speed, due to the inertia effect, an ash layer deposited is tamped, so that the ash layer is more easily adhered to the surface of a impeller, after a certain amount of coal gas reaches, the vibration and the efficiency of a fan are reduced, the amount of conveyed flue gas is reduced, and finally the machine is stopped for maintenance.

At present, the problem of scaling in the operation of a fan is mainly solved by adopting an online water washing method, and washing is carried out by arranging washing nozzles in front of and behind a fan impeller and blades. However, the coverage area of the nozzle has a dead zone, so that the inside of the fan cannot be completely covered, the nozzle is easy to scale and block in flue gas, uneven washing is caused, regular maintenance is needed, pressure exists in water flow of the nozzle, and the fan cannot be descaled at any time period in order to protect the fan. Because online water washing has above defect, need regularly clear up the maintenance to and measure such as shut down and wash, can only alleviate to a certain extent, can't solve the problem of fan scale deposit completely.

Disclosure of Invention

Aiming at the problems, the invention provides an online descaling device for a fan, which can effectively solve the problem of fan scaling by using an acoustic wave descaling technology. The invention is realized by the following technical scheme:

the utility model provides an online scale removal device of fan, includes the sound wave equipment that sets up on the online pipeline that the fan is connected, sound wave equipment is including relief pressure valve, pressure switch, first solenoid valve, sonic generator, second solenoid valve and the horn that connects gradually, the horn sets up on the online pipeline and inside towards the online pipeline.

Furthermore, the first electromagnetic valve and the sound generator are connected through a metal hose.

Furthermore, the online fan descaling device further comprises a controller, and the controller is respectively connected with the pressure switch, the first electromagnetic valve, the sound wave generator and the second electromagnetic valve.

Furthermore, the input end of the pressure reducing valve of the fan online descaling device is connected with a filter, and gas generated by sound waves enters the pressure reducing valve after passing through the filter.

In the device provided by the invention, the horn can be welded on the line pipe, and the sound wave generator has the characteristics of wide frequency band and high power and can send out sound waves of specified signals according to requirements. The controller can receive the feedback signal of the pressure switch and can transmit the control signal to the first electromagnetic valve, the second electromagnetic valve and the sound generator.

The invention provides an online descaling device for a fan, which comprises the fan, a pipeline and sound wave equipment additionally arranged on the pipeline in front of an inlet of the fan. The sound wave that the device sent can completely cover the fan inside, under the effect of the sound wave that excels in, can effectively get rid of the inside dirt that has concretied of fan, and the dirt can not gather in the pyrolysis oven simultaneously, can effectively prevent the growth of dirt, guarantees the long-term reliable operation of equipment. The invention can solve the problem of fan scaling, and can also avoid the defects that the traditional online flushing device is easy to damage impellers and blades, cannot operate at any time interval, cannot completely cover all scaling positions in the fan, is easy to block when operating in smoke dust, and the like.

According to the fan online descaling device, sound waves generated by the device have the characteristics of wide frequency band, high power and no dead zone in action, and can effectively remove various scales at all positions in the fan; in addition, because the sound waves have no side effects such as blowing loss on the impeller and blades of the fan, and no mechanical structure which is easy to block and needs frequent maintenance exists, the device can operate at any time interval, scale is removed on line, the stable operation of the fan is ensured, and the dynamic balance problem caused by scale formation is avoided.

Drawings

Fig. 1 is a schematic view of the fan online descaling device provided in embodiment 1, wherein 1 is a filter, 2 is a pressure reducing valve, 3 is a pressure switch, 4 is a first electromagnetic valve, 5 is a metal hose, 6 is a sound wave generator, 7 is a second electromagnetic valve, 8 is a horn, 9 is an online pipeline, 10 is a fan, and 11 is a controller.

Detailed Description

Example 1

As shown in fig. 1, the online blower descaling device installed in a converter dedusting system of a steel mill provided in this embodiment includes: the device comprises a filter 1, a pressure reducing valve 2, a pressure switch 3, a first electromagnetic valve 4, a metal hose 5, a sound wave generator 6, a second electromagnetic valve 7, a horn 8 and a controller 11. An online pipeline 9 of the converter dust removal system is connected with an air inlet of a fan 10, a filter 1, a pressure reducing valve 2, a pressure switch 3, a first electromagnetic valve 4, a metal hose 5, a sound wave generator 6, a second electromagnetic valve 7 and a horn 8 are sequentially arranged and connected and are connected through a compressed air pipeline flange, and the horn 8 is welded on the online pipeline 9 and faces the inside of the online pipeline 9. The controller 11 is respectively connected with the pressure switch 3, the first electromagnetic valve 4, the sound wave generator 6 and the second electromagnetic valve 7.

The working principle and the working process of the device are as follows:

(1) before the system runs, nitrogen from a plant nitrogen main pipe reaches a pressure switch 3 through a filter 1 and a pressure reducing valve 2, a controller 11 receives a pressure meeting signal fed back by the pressure switch 3, and the system is in a normal running state at the moment.

(2) When the system operates, the controller 11 transmits an on signal to the first electromagnetic valve 4 and the second electromagnetic valve 7 respectively, the first electromagnetic valve 4 and the second electromagnetic valve 7 are opened, and at the moment, nitrogen is sprayed out of the first electromagnetic valve 4, the sound wave generator 6, the second electromagnetic valve 7 and the horn 8 in sequence; and then the controller 11 transmits a preset descaling sound wave signal to the sound wave generator 6, the sound wave generator 6 generates vibration sound according to the signal, and the sound wave is changed into high-strength sound wave under the coordination of nitrogen and acts on the inside of the fan along with the smoke.

When sound waves are transmitted in the fan, molecules in the fan vibrate due to the energy of the sound waves, and the molecules vibrating on the boundary layer drive adjacent medium molecules to vibrate, so that two effects are generated: firstly, the mechanical energy of the sound wave is transmitted to adjacent media to form solid sound waves, and secondly, the acting force applied to the adjacent media by the sound wave is cooperated with the viscous force among molecules, so that the molecules are constantly pulled back and forth by the sound wave. If the frequency of the acoustic wave is equal to the resonance frequency of the molecule, the resulting resonance effect enhances both effects.

The dirt attached to the fan absorbs the high-intensity sound waves and generates fine vibration under the first effect. At this time, the surface of the scale is deformed to become loose and broken. The gradual process is a process of absorbing and accumulating sound energy by the scale, once micro cracks are formed on the surface of the scale, sound waves can propagate along the micro cracks, and the scale is separated from the fan. The second effect is to continuously pull the dirt inside the fan back and forth, so that the dirt is continuously extruded and stretched. Due to the repeated action of sound waves on the scale from tens to hundreds of times per second, the scale breaks due to acoustic fatigue and gradually loosens and falls off. In addition, under the action of high-intensity sound waves, scale cannot be accumulated in the pyrolysis furnace, so that the growth of the scale can be effectively prevented, and the long-term reliable operation of equipment is ensured.

Aiming at the problems of fan scaling and impeller blockage and damage of an online washing device, the fan online descaling device provided by the invention can automatically operate at any time period of high-intensity sound waves, can effectively remove the scale in the fan through online descaling, ensures stable operation of the fan, does not generate a dynamic balance problem due to scaling, greatly prolongs the off-line descaling period of the fan, and saves the cost.

Claims (4)

1. The utility model provides an online scale removal device of fan, includes the sound wave equipment that sets up on online pipeline (9) that the fan is connected, its characterized in that, sound wave equipment is including relief pressure valve (2), pressure switch (3), first solenoid valve (4), acoustic generator (6), second solenoid valve (7) and horn (8) that connect gradually, horn (8) set up on online pipeline (9) and inside towards online pipeline.

2. The fan online descaling device according to claim 1, wherein the first solenoid valve (4) and the sound generator (6) are connected through a metal hose (5).

3. The online blower descaling device according to claim 1, further comprising a controller (11), wherein the controller (11) is respectively connected with the pressure switch (3), the first electromagnetic valve (4), the sound wave generator (6) and the second electromagnetic valve (7).

4. The online blower descaling device according to claim 1, wherein a filter (1) is connected to an input end of the pressure reducing valve (2), and the gas generated by the sound waves enters the pressure reducing valve (2) after passing through the filter (1).

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