Automatic cleaning device and method for steam induced draft fan

Abstract

This invention discloses an automatic cleaning device and method for a steam induced draft fan, belonging to the field of continuous casting machine production technology. The automatic cleaning device includes a first pipe connected to a water pipe system, a second pipe connected to the first pipe, an aerosol nozzle connected to the second pipe via a third pipe, and a valve body connected between the second and third pipes. The side wall of the first pipe has a first interface matching the second pipe, and the side wall of the steam pipe has a second interface matching the third pipe. One end of the second pipe is connected to the first interface, and the other end is connected to the valve body. One end of the third pipe is connected to the second interface, and the other end is connected to the valve body. The aerosol nozzle is connected to the second interface on the side away from the valve body, and the aerosol nozzle corresponds to the impeller. This invention realizes online automatic cleaning of the steam induced draft fan impeller without stopping the machine, effectively solving the pain points of limited maintenance space and high difficulty in rotor maintenance and replacement in the prior art.

Description

Technical Field

[0001] This invention belongs to the field of continuous casting machine production technology, and particularly relates to an automatic cleaning device and method for a steam induced draft fan. Background Technology

[0002] During continuous casting, the secondary cooling chamber generates a large amount of high-temperature steam and corrosive water vapor containing oxides and oil mist. If not removed in time, this can lead to a humid environment around the continuous casting machine, damaging electrical equipment and mechanical components, and causing equipment overheating and environmental pollution. The steam induced draft fan, as a key auxiliary device, effectively removes water vapor from the secondary cooling chamber through forced ventilation, ensuring the normal operation of the continuous casting machine. The efficiency of its core rotating component, the fan rotor, directly determines the steam removal effect. Although not a core component of the continuous casting machine itself, it is crucial to the continuity and efficiency of the continuous casting process.

[0003] Currently, during the production process, the rotor of the steam induced draft fan is prone to the adhesion of corrosive water vapor, protective slag, and other substances, causing the blades to become unevenly oriented during rotation, disrupting the rotor's dynamic balance, and leading to impeller wear, reduced fan efficiency, and in severe cases, equipment failure, resulting in continuous casting machine shutdown for maintenance. Furthermore, due to the structural limitations and maintenance space constraints of the steam induced draft fan, rotor repair and replacement are extremely difficult. Existing technologies lack effective automatic cleaning methods for this scenario, making it impossible to achieve long-term rotor operation and failing to solve the aforementioned technical problems, seriously affecting production stability. Therefore, there is an urgent need for an automatic cleaning device and method for steam induced draft fans. Summary of the Invention

[0004] To address some or all of the technical problems existing in the prior art, the present invention provides an automatic cleaning device and method for a steam induced draft fan.

[0005] In one aspect of the invention, an automatic cleaning device for a steam draft fan is provided. A water pipe system is provided on one side of the steam draft fan. The steam draft fan includes a rotor, an impeller connected to the output end of the rotor, and a steam pipe with a sealing cover disposed on the impeller. The automatic cleaning device includes a first pipe connected to the water pipe system, a second pipe connected to the first pipe, an aerosol nozzle connected to the second pipe via a third pipe, and a valve body connected between the second pipe and the third pipe, wherein: The first pipe has a first interface on its side wall that matches the second pipe, and the steam pipe has a second interface on its side wall that matches the third pipe. One end of the second pipe is connected to the first interface and the other end is connected to the valve body. One end of the third pipe is connected to the second interface and the other end is connected to the valve body. The aerosol nozzle is connected to the second interface on the side away from the valve body and corresponds to the impeller.

[0006] Furthermore, in the aforementioned automatic cleaning device for the steam induced draft fan, the first pipe is a continuous casting secondary cooling water inlet pipe.

[0007] Furthermore, in the aforementioned automatic cleaning device for the steam induced draft fan, the second pipe is a metal flexible hose.

[0008] Furthermore, in the aforementioned automatic cleaning device for the steam induced draft fan, the third pipe is a stainless steel pipe.

[0009] Furthermore, in the automatic cleaning device of the aforementioned steam induced draft fan, the aerosol nozzle is a brass fan-shaped aerosol nozzle.

[0010] In another aspect of the invention, an automatic cleaning method for a steam induced draft fan is also provided, comprising: Step 1: After starting the steam induced draft fan, the rotor drives the impeller to rotate, and the impeller generates airflow to draw water vapor in the secondary cooling chamber into the steam pipe; Step 2: Cooling water flows sequentially through the water pipe system, the first pipe, the first interface, the second pipe, the valve body, the third pipe, and the second interface into the aerosol nozzle, whereby the aerosol nozzle converts the cooling water into aerosol and sprays it onto the rotating impeller. Step 3: The rotating impeller completes automatic cleaning under the combined action of centrifugal force and the aerosol scouring.

[0011] Furthermore, in the above-mentioned automatic cleaning method for steam induced draft fans, the aerosol nozzle can be stopped from spraying aerosol by closing the valve body.

[0012] The automatic cleaning device and method for steam induced draft fans of the present invention have the following advantages and positive effects: (1) By laying out pipelines, valve bodies and aerosol nozzles connected to the existing water supply system, the present invention realizes the online non-stop automatic cleaning of the steam induced draft fan impeller without disassembling the main fan equipment, effectively solving the pain points of the existing technology that are limited by maintenance space and difficult to repair and replace rotors, greatly reducing the difficulty of equipment maintenance and ensuring the continuity and stability of continuous casting production. (2) The present invention converts cooling water into a uniform mist with a wide coverage area through a mist nozzle. Combined with the centrifugal force generated by the high-speed rotation of the impeller, it forms a dual cleaning effect, which can completely remove corrosive water vapor condensate, protective slag and other impurities attached to the impeller surface, avoid impeller sinking and dynamic balance damage caused by impurity attachment, effectively reduce impeller wear, maintain stable operating efficiency of the fan, greatly extend rotor service life, and reduce equipment failure probability and maintenance and replacement frequency. (3) The present invention directly reuses the existing secondary cooling water system of the continuous casting machine as the water source for cleaning, without the need to add an independent water supply power unit. The overall structure of the device is simple and does not require major modification to the main structure of the steam induced draft fan. It is compatible with the equipment layout and space constraints of the existing continuous casting workshop. The valve body realizes flexible control of the cleaning pipeline opening and closing and water supply status. The cleaning operation can be started and stopped as needed according to the operating conditions of the steam induced draft fan and the impeller impurity attachment. It has good practicality. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for further understanding of the embodiments of the present invention and constitute a part of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings: Figure 1 This is a schematic diagram of the automatic cleaning device for the steam draft fan of the present invention.

[0014] Explanation of reference numerals in the attached figures: 1. First pipe; 11. First interface; 2. Second pipe; 22. Second interface; 3. Third pipe; 4. Valve body; 5. Aerosol nozzle; 6. Rotor; 7. Impeller; 8. Steam pipe. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0016] This invention provides an automatic cleaning device and method for a steam induced draft fan, wherein a water pipe system is installed on one side of the steam induced draft fan, such as... Figure 1 As shown, the steam induced draft fan includes a rotor 6, an impeller 7 connected to the output end of the rotor 6, and a steam pipe 8 with a sealing cover on the impeller 7. The steam pipe 8 is used to form a closed airflow channel to ensure that the negative pressure airflow generated when the impeller 7 rotates can stably draw water vapor from the secondary cooling chamber and complete its discharge. The automatic cleaning device includes a first pipe 1 connected to the water pipe system, a second pipe 2 connected to the first pipe 1, an aerosol nozzle 5 connected to the second pipe 2 via a third pipe 3, and a valve body 4 connected between the second pipe 2 and the third pipe 3. The first pipe 1 has a first interface 11 on its side wall that matches the second pipe 2, and the steam pipe 8 has a second interface 22 on its side wall that matches the third pipe 3. One end of the second pipe 2 is connected to the first interface 11, and the other end is connected to the valve body 4. One end of the third pipe 3 is connected to the second interface 22, and the other end is connected to the valve body 4. The aerosol nozzle 5 is connected to the second interface 22 on the side away from the valve body 4, and the aerosol nozzle 5 corresponds to the impeller 7. More specifically, the spray end of the aerosol nozzle 5 is set to correspond to the working surface of the blades of the impeller 7, ensuring that the sprayed aerosol can fully cover the rotating area of ​​the impeller 7. The core function of the aerosol nozzle 5 is to convert the incoming pressurized cooling water into a uniform fan-shaped aerosol, which is then sprayed onto the surface of the high-speed rotating impeller 7 to continuously flush and clean the corrosive water vapor condensate, protective slag, and other impurities adhering to the surface of the impeller 7. The atomized aerosol has a larger coverage area, which can fully cover all working surfaces and structural gaps of the impeller 7, ensuring that there are no dead corners in the cleaning and avoiding the problem of impeller 7 sinking due to localized adhesion of impurities. At the same time, the atomized aerosol has a uniform texture and will not cause rigid impact damage to the high-speed rotating impeller 7, thus ensuring the structural integrity and operational stability of the impeller 7.

[0017] As a specific implementation, in the automatic cleaning device of the steam induced draft fan of the present invention, the first pipe 1 is the continuous casting secondary cooling water inlet pipe, which directly reuses the existing secondary cooling water supply system in the continuous casting production process. There is no need to add additional water supply equipment and power unit, which greatly reduces the installation cost and modification difficulty of the device. At the same time, it can rely on the stable pressure of the existing water supply system to ensure a continuous and stable supply of cleaning water, which is fully adapted to the continuous operation conditions of continuous casting production.

[0018] As a specific implementation, in the automatic cleaning device of the steam induced draft fan of the present invention, the second pipe 2 is a metal flexible hose. The metal flexible hose has good flexibility and structural strength, and can be flexibly bent to adapt to the complex equipment layout and narrow installation space of the continuous casting workshop. At the same time, it has excellent high temperature resistance, corrosion resistance and aging resistance, and can adapt to the harsh working conditions of high temperature, dust and corrosive media in the continuous casting workshop for a long time, ensuring the service life and operational stability of the pipeline, and avoiding water supply interruption and pressure loss caused by pipeline damage.

[0019] As a specific implementation, in the automatic cleaning device of the steam induced draft fan of the present invention, the third pipe 3 is a stainless steel pipe. Stainless steel pipe has excellent structural rigidity, corrosion resistance and high temperature resistance, and can adapt to the harsh environment of high temperature, high humidity and corrosive media inside the steam pipe 8 for a long time, avoiding water supply abnormalities and blockages caused by pipe corrosion and deformation. At the same time, it can form a stable sealed connection with the second interface 22 of the steam pipe 8 to prevent the high temperature steam inside the steam pipe 8 from leaking out, and ensure the safety of equipment operation and the stability of the site environment.

[0020] As a specific implementation, in the automatic cleaning device of the steam induced draft fan of the present invention, the aerosol nozzle 5 is a brass fan-shaped aerosol nozzle. Brass material has excellent wear resistance, corrosion resistance and thermal shock resistance, and can adapt to the harsh working conditions of high temperature and corrosive media for a long time, ensuring the atomization effect and service life of the nozzle. The fan-shaped spray structure can form a large-area uniform water curtain, fully covering the rotation area of ​​the impeller 7, further improving the uniformity and comprehensiveness of the cleaning effect.

[0021] As a specific embodiment, in the automatic cleaning device of the steam induced draft fan of the present invention, all connection parts between the first interface 11 and the second pipe 2, between the second pipe 2 and the valve body 4, between the valve body 4 and the third pipe 3, and between the third pipe 3 and the aerosol nozzle 5 are equipped with suitable sealing structures. The sealing structures are used to ensure the sealing of each connection part, avoid pressure loss caused by cooling water leakage, ensure the atomization effect and flushing pressure of the aerosol nozzle 5, and at the same time prevent external dust and impurities from entering the pipeline and causing blockage, thus ensuring the long-term stable operation of the device.

[0022] On the other hand, the automatic cleaning method for the steam induced draft fan of the present invention is implemented using the above-mentioned automatic cleaning device, and specifically includes the following steps: Step 1: Start the steam induced draft fan. The rotor 6 drives the impeller 7 to rotate synchronously at high speed. During the rotation of the impeller 7, a stable negative pressure airflow is formed in the internal cavity of the steam pipe 8. This negative pressure airflow continuously draws the high-temperature corrosive water vapor, dust and other media generated in the secondary cooling chamber of the continuous casting machine into the steam pipe 8 and discharges them through the outlet end of the steam pipe 8, thus completing the continuous ventilation and exhaust operation of the secondary cooling chamber and ensuring the stability of the production environment and equipment operation of the continuous casting machine.

[0023] Step 2: When cleaning the impeller 7 is required, the control valve 4 is opened. The pressurized cooling water in the water pipe system flows sequentially through the first pipe 1, the first interface 11, the second pipe 2, the valve 4, and the third pipe 3, before continuously and stably entering the aerosol nozzle 5. The aerosol nozzle 5, through its internal structure, transforms the incoming pressurized cooling water into a uniform fan-shaped mist, which is continuously sprayed onto the surface of the high-speed rotating impeller 7. This continuously and uniformly washes away impurities adhering to the impeller 7 surface, causing the impurities to peel off. During this process, the flow rate and pressure of the cooling water entering the aerosol nozzle 5 can be adjusted by regulating the opening of the valve 4, thereby adjusting the spray range and washing force of the mist to adapt to different impurity adhesion conditions and impeller 7 operating conditions, ensuring cleaning effectiveness while avoiding unnecessary cooling water consumption.

[0024] Step 3: The high-speed rotating impeller 7, under the combined action of centrifugal force generated by its own rotation and continuous scouring by the aerosol, thoroughly and completely removes corrosive water vapor condensate, protective slag, and other impurities adhering to its surface. The removed impurities are discharged from the steam pipe 8 along with the cooling water and airflow within the steam pipe 8, completing the online automatic cleaning of the impeller 7. Specifically, the centrifugal force generated by the rotation of the impeller 7 can throw liquid water and impurities from its surface radially outwards. Combined with the frontal scouring by the aerosol, this achieves comprehensive cleaning of all parts of the impeller 7, including the working surface, back surface, and blade root gaps, preventing impurity residue. This fundamentally solves the problems of impeller 7 unevenness and dynamic balance disruption caused by impurity adhesion, ensuring the long-term stable operation of the impeller 7 and rotor 6, significantly reducing the frequency of rotor 6 maintenance and replacement, and minimizing production losses due to equipment failure.

[0025] As a specific implementation method, in the automatic cleaning method of the steam induced draft fan of the present invention, closing the valve body 4 can stop the aerosol nozzle 5 from spraying aerosol. More specifically, the core function of the valve body 4 is to control the opening and closing of the water supply path of the cleaning device, thereby controlling the start and stop of the cleaning operation. At the same time, the water supply flow and pressure can be adjusted by adjusting the opening degree of the valve body 4 to adapt to different cleaning conditions. The operator can flexibly control the opening and closing state and opening degree of the valve body 4 according to the operating conditions of the steam induced draft fan and the impurity adhesion of the impeller 7, so as to realize the on-demand start and stop and intensity adjustment of the cleaning operation, adapting to different conditions of continuous casting production. At the same time, during equipment maintenance, the water supply can be completely cut off by closing the valve body 4 to ensure the safety of maintenance operations.

[0026] In summary, compared with the prior art, the automatic cleaning device and method for steam induced draft fans of the present invention have the following advantages and positive effects: (1) By laying out pipelines, valve bodies 4 and aerosol nozzles 5 connected to the existing water supply system, the present invention realizes the online non-stop automatic cleaning of the steam induced draft fan impeller 7 without disassembling the main fan equipment, effectively solving the pain points of the existing technology that are limited by maintenance space and difficult to repair and replace rotor 6, greatly reducing the difficulty of equipment maintenance and ensuring the continuity and stability of continuous casting production. (2) The present invention converts cooling water into a uniform mist with a wide coverage area through the aerosol nozzle 5. Combined with the centrifugal force generated by the high-speed rotation of the impeller 7, it forms a dual cleaning effect, which can completely remove corrosive water vapor condensate, protective residue and other impurities attached to the surface of the impeller 7, avoid the problem of impeller 7 sinking and dynamic balance damage caused by impurity attachment, effectively reduce impeller 7 wear, maintain stable operating efficiency of the fan, greatly extend the service life of the rotor 6, and reduce the probability of equipment failure and the frequency of maintenance and replacement. (3) The present invention directly reuses the existing secondary cooling water system of the continuous casting machine as the water source for cleaning, without the need to add an independent water supply power unit. The overall structure of the device is simple and does not require major modification of the main structure of the steam induced draft fan. It is compatible with the equipment layout and space constraints of the existing continuous casting workshop. The valve body 4 realizes flexible control of the cleaning pipeline opening and closing and water supply status. The cleaning operation can be started and stopped as needed according to the operating conditions of the steam induced draft fan and the impeller 7 impurity attachment. It has good practicality.

[0027] It should be noted that, unless otherwise expressly specified and limited, the term "connection" or its synonyms should be interpreted broadly in this document. For example, "connection" can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two elements or the interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. Furthermore, expressions such as "first" and "second" are merely used to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Meanwhile, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. In addition, the terms "front," "rear," "left," "right," "upper," and "lower" in this document refer to the placement states shown in the accompanying drawings.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An automatic cleaning device for a steam induced draft fan, wherein a water pipe system is provided on one side of the steam induced draft fan, the steam induced draft fan includes a rotor, an impeller connected to the output end of the rotor, and a steam pipe with a sealing cover disposed on the impeller, characterized in that, The automatic cleaning device includes a first pipe connected to the water pipe system, a second pipe connected to the first pipe, an aerosol nozzle connected to the second pipe via a third pipe, and a valve body disposed between the second pipe and the third pipe, wherein: The first pipe has a first interface on its side wall that matches the second pipe, and the steam pipe has a second interface on its side wall that matches the third pipe. One end of the second pipe is connected to the first interface and the other end is connected to the valve body. One end of the third pipe is connected to the second interface and the other end is connected to the valve body. The aerosol nozzle is connected to the second interface on the side away from the valve body and corresponds to the impeller.

2. The automatic cleaning device for the steam induced draft fan according to claim 1, characterized in that, The first pipeline is the inlet pipeline for the secondary cooling water of continuous casting.

3. The automatic cleaning device for the steam induced draft fan according to claim 1, characterized in that, The second pipe is a metal flexible tube.

4. The automatic cleaning device for the steam induced draft fan according to claim 1, characterized in that, The third pipe is a stainless steel pipe.

5. The automatic cleaning device for the steam induced draft fan according to claim 1, characterized in that, The aerosol nozzle is a brass fan-shaped aerosol nozzle.

6. An automatic cleaning method for a steam induced draft fan, the automatic cleaning method being implemented using the automatic cleaning device as described in any one of claims 1 to 5, comprising: Step 1: After starting the steam induced draft fan, the rotor drives the impeller to rotate, and the impeller generates airflow to draw water vapor in the secondary cooling chamber into the steam pipe; Step 2: Cooling water flows sequentially through the water pipe system, the first pipe, the first interface, the second pipe, the valve body, the third pipe, and the second interface into the aerosol nozzle, whereby the aerosol nozzle converts the cooling water into aerosol and sprays it onto the rotating impeller. Step 3: The rotating impeller completes automatic cleaning under the combined action of centrifugal force and the aerosol scouring.

7. The automatic cleaning method for a steam induced draft fan according to claim 6, characterized in that, Closing the valve body can stop the aerosol nozzle from spraying aerosol.

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