A deaerator exhaust filter device

Abstract

The utility model belongs to the technical field of deaerator equipment, especially, relate to a exhaust filter device for deaerator, include: deaerator exhaust pipe, the discharge end of deaerator exhaust pipe is connected with exhaust filter pipe, still include: main filter mechanism, main filter mechanism sets up in exhaust filter pipe away from deaerator exhaust pipe one end, and main filter mechanism includes filter screen, prefilter mechanism, prefilter mechanism sets up in exhaust filter pipe and is located main filter mechanism's upstream side, wherein, prefilter mechanism carries out the capture to the particle contained in exhaust gas flow through inertia. Relative to prior art, the utility model discloses through setting up prefilter mechanism, utilizes the particle in exhaust gas flow and carries out the pre-capture through inertia effect, reduced the particle number of entering main filter mechanism filter screen, reduced the frequency of filter screen under high particle load and blocked, reduced the frequency of cleaning filter screen, reduced the working strength of staff.

Description

Technical Field

[0001] This utility model belongs to the technical field of deaerator equipment, and in particular relates to an exhaust filtration device for deaerators. Background Technology

[0002] A deaerator is a device used to remove dissolved oxygen from water. It is commonly used in boiler feedwater systems to prevent oxygen-induced corrosion, especially in boiler water circulation systems with high temperature and high pressure. Oxygen is a corrosive substance in water, which accelerates the corrosion of metal pipes and equipment inside boilers. Therefore, the role of deaerators is very important. Among deaerators, the exhaust filtration device is an important component. For example, the exhaust filtration device for deaerators disclosed in patent application number CN202121845562.8 includes a deaerator outlet pipe and a connecting pipe. A first ring and a second ring are respectively fixed to one end of the deaerator outlet pipe and the connecting pipe, and the two are detachably connected by two screws. A bearing plate and a support plate are fixed on the connecting pipe. A drive motor is fixed on the bearing plate, and its output end is connected to a first helical gear. A round rod is connected to the side of the support plate through a bearing. A first round tube and a second round tube are fixed on the round rod, and a second helical gear is fixed to one end of the round rod. A first filter screen and a second filter screen are respectively fixed on the first round tube through two first connecting rods. A third filter screen and a fourth filter screen are respectively fixed on the second round tube through two second connecting rods. The existing deaerator exhaust filtration device becomes frequently clogged under high particulate loads, requiring frequent cleaning of the filter screen and increasing workload. Therefore, it is necessary to make improvements. Utility Model Content

[0003] The purpose of this invention is to address the aforementioned technical problems by providing an exhaust filtration device for deaerators, which effectively reduces the frequency of filter cleaning and lowers workload.

[0004] In view of this, the present invention provides an exhaust gas filtration device for a deaerator, comprising: A deaerator exhaust pipe, wherein the exhaust end of the deaerator exhaust pipe is connected to an exhaust filter pipe; Also includes: A main filtration mechanism is located at the end of the exhaust filter pipe away from the deoxygenated exhaust pipe, and the main filtration mechanism includes a filter screen. A pre-filter mechanism is disposed in the exhaust filter pipe and located upstream of the main filter mechanism; The pre-filtration mechanism captures particles contained in the exhaust gas flow through inertia.

[0005] In this technical solution, the exhaust airflow generated by the deaerator is discharged outward through the deaerator exhaust pipe and exhaust filter pipe. By setting up a pre-filtration mechanism, particles in the exhaust airflow are pre-captured by inertia, which reduces the number of particles entering the main filter screen, reduces the frequency of filter screen clogging under high particle load, reduces the number of times the filter screen needs to be cleaned, and reduces the workload of the staff.

[0006] In the above technical solution, the pre-filtering mechanism further includes: An inertial filtration section, which is composed of several inertial filter plates; A collection box is located at the bottom of the exhaust filter pipe; The collection box is located directly below the inertial filter section, and the top of the collection box has a collection port that communicates with the inside of the exhaust filter pipe. Several inertial filter plates are evenly spaced along the width direction of the exhaust filter plate. The inertial force of the inertial filter plate causes the particles contained in the exhaust airflow to collide with and be captured on the inertial filter plate.

[0007] Furthermore, the above technical solution also includes: A baffle assembly, comprising two baffles symmetrically distributed along the width of the exhaust filter pipe, wherein the two baffles are controlled by a drive unit to move closer to or separate from each other to adjust the flow rate of the exhaust airflow; The linkage unit is used to transmit the driving force of the baffle plate to the inertial filter unit to synchronously adjust the spacing of several inertial filter plates. The baffle assembly is located at the air inlet end of the exhaust filter pipe.

[0008] In the above technical solution, the collection box further includes: The guide plate has two pieces, which are distributed vertically and at intervals in the collection box; The guide plates are distributed at an angle from top to bottom. The high side of the guide plate is connected to the inner wall of one side of the collection box, and a material discharge gap is formed between the low side of the guide plate and the inner wall of the other side of the collection box. The two guide plates are staggered in the width direction of the collection box.

[0009] In the above technical solution, the main filtration mechanism further includes: A frame is installed in the exhaust filter pipe, and a static pressure probe is integrated on the frame for measuring the pressure difference before and after filtration. The filter screen is mounted on the frame.

[0010] The beneficial effects of this utility model are: 1. By setting up a pre-filtration mechanism, particles in the exhaust airflow are pre-captured using inertia, reducing the number of particles entering the main filter screen, lowering the frequency of filter screen clogging under high particle load, reducing the number of times the filter screen needs to be cleaned, and reducing the workload of staff.

[0011] 2. The inertial filter plate in the pre-filtration mechanism adopts a multi-stage bent plate structure to form multiple groove-shaped capture zones, which can more effectively capture particles of different sizes and motion trajectories, thus improving the pre-filtration effect.

[0012] 3. The baffle assembly can adjust its spacing based on the particle concentration detected by the sensor, thereby changing the exhaust airflow velocity. When the particle concentration is high, the baffle spacing is reduced to increase the airflow speed and enhance the inertial filtration effect; when the particle concentration is low, the baffle spacing is increased to reduce airflow resistance, ensure smooth exhaust, and reduce energy consumption. Simultaneously, the linkage unit transmits the driving force of the baffles to the inertial filtration unit, synchronously adjusting the spacing of the inertial filter plates to match the airflow velocity, further improving filtration efficiency.

[0013] 4. The guide plates inside the collection box are staggered to form a tortuous channel, allowing the captured particles to fall smoothly under the action of gravity and be collected, preventing the particles from being stirred up again by the airflow after being collected, thus ensuring the collection effect.

[0014] 5. The static pressure probe in the main filtration mechanism can measure the pressure difference before and after filtration in real time, which makes it easy for staff to understand the clogging of the filter screen in a timely manner, so as to clean or replace it at the appropriate time, ensuring the normal operation of the filtration device. In addition, the probe is directly integrated into the filter, reducing external components and making it convenient for installation and use. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of a specific embodiment of the present utility model.

[0017] Figure 2 This is a schematic diagram of the main structure of this utility model.

[0018] Figure 3 This is a schematic diagram of the main filtration mechanism of this utility model.

[0019] Figure 4 This is a schematic diagram of the pre-filtration mechanism of this utility model.

[0020] Figure 5 This is a schematic diagram of the inertial filter plate structure of this utility model.

[0021] Figure 6 This is a schematic diagram of the collection box structure of this utility model.

[0022] The markings in the diagram are as follows: 1. Deaerator exhaust pipe; 2. Exhaust filter pipe; 3. Main filter mechanism; 30. Filter screen; 31. Frame; 32. Static pressure probe; 4. Pre-filtration mechanism; 40. Inertial filter plate; 400. Guide plate; 401. Connecting plate; 402. Bending plate; 41. Collection box; 410. Collection port; 411. Guide plate; 5. Baffle plate; 6. Drive unit; 7. Linkage part; 70. Hinge linkage structure; 71. Slide rod. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] In the description of this application, it should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. For ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0025] Overall structure The exhaust filtration device for the deaerator in this embodiment mainly consists of a deaerator exhaust pipe 1, an exhaust filter pipe 2, a main filter mechanism 3, a pre-filter mechanism 4, a baffle plate assembly, and a linkage part 7. One end of the deaerator exhaust pipe 1 is connected to the deaerator, and the other end is connected to the inlet end of the exhaust filter pipe 2, which is used to guide the gas containing particles discharged from the deaerator into the exhaust filter pipe 2 for filtration. The exhaust filter pipe 2 is a hollow tubular structure made of corrosion-resistant and high-temperature-resistant metal materials, such as stainless steel, to adapt to the working environment of the deaerator exhaust. Inside, there are baffle plate groups, pre-filtration mechanism 4, and main filtration mechanism 3 arranged sequentially. The parts are fixed together by welding or bolting to ensure the stability of the structure. Pre-filtration unit 4 Inertial filtration section: Composed of several inertial filter plates 40, evenly spaced along the width of the exhaust filter pipe 2. The inertial filter plates 40 employ a multi-stage bent plate 402 structure. Each inertial filter plate 40 includes two guide plates 400 at the beginning and end, a connecting plate 401 connecting the two guide plates 400, and three bent plates 402. The angles between the two connecting plates 401 and between the connecting plate 401 and the guide plates 400 are both 120 degrees (obtuse angles). This angle design ensures smooth airflow and allows particles to smoothly impact the capture area under inertial action. Of the three bending plates 402, one bending plate 402 is located at the connection point of the two connecting plates 401 and is on the left side, forming a groove-shaped capture area protruding to the left with the connecting plates 401, with the protruding end on the left side of the connection point of the two connecting plates 401; one bending plate 402 is located at the connection point of the connecting plate 401 and the tail guide plate 400 and is on the right side, forming a groove-shaped capture area protruding to the right with the connecting plate 401 and the tail guide plate 400; and one bending plate 402 is located at the tail end of the tail guide plate 400 and is on the left side, forming a groove-shaped capture area protruding to the left with the tail guide plate 400, further enhancing the particle capture effect. When the exhaust gas flows through the inertial filter plate 40, the airflow moves along the surfaces of the guide plate 400 and the connecting plate 401. Due to their greater inertia, the particles continue to maintain their original direction of motion and collide with the groove-shaped capture area formed by the bending plate 402 and the connecting plate 401 or the guide plate 400, thus being captured on the inertial filter plate 40. The groove-shaped capture areas at different locations can capture particles with different motion trajectories, greatly improving the efficiency of pre-filtration. Collection box 41: Located at the bottom of the exhaust filter pipe 2, directly below the inertial filter section, its top has a collection port 410 communicating with the inside of the exhaust filter pipe 2, used to collect particles falling from the inertial filter plate 40. Inside the collection box 41, there are two guide plates 411 spaced vertically, the guide plates 411 are inclined from top to bottom at an angle of 30 degrees. The upper guide plate 411 is bolted to the left inner wall of the collection box 41 on its high side, and forms a discharge gap between its low side and the right inner wall of the collection box 41. The lower guide plate 411 is bolted to the right inner wall of the collection box 41 on its high side, and forms a discharge gap between its low side and the left inner wall of the collection box 41. The two guide plates 411 are staggered in the width direction of the collection box 41. When particles fall from the inertial filter plate 40, they first land on the upper guide plate 411. Under the influence of gravity, they slide down the guide plate 411, pass through the feeding gap, and fall onto the lower guide plate 411. They then slide down the lower guide plate 411 and finally fall into the bottom of the collection box 41. This staggered distribution of guide plates 411 creates a tortuous channel, preventing particles from being re-entrained by the airflow during their fall, ensuring smooth particle collection, and also preventing particles from accumulating in the collection box 41 and clogging the collection port 410. The bottom of the collection box 41 is also equipped with a removable drain cover. When the particles in the collection box 41 accumulate to a certain amount, the staff can open the drain cover for cleaning, which is convenient to operate. Baffle assembly and linkage 7 Baffle assembly: Composed of two baffles symmetrically distributed along the width of the exhaust filter pipe 2. The baffles 5 can be made of rectangular steel plates with smooth surfaces to reduce airflow resistance. The two ends of the two baffles 5 are slidably connected to slide rails provided on the inner walls of both sides of the exhaust filter pipe 2 via sliders, ensuring that the baffles 5 can move smoothly left and right. The drive unit 6 uses a cylinder, model SC63-500, which is fixed on both sides of the exterior of the exhaust filter pipe 2. The piston rod of the cylinder passes through the side wall of the exhaust filter pipe 2 and connects to the middle of the outer side of the baffle plate 5. By controlling the extension and retraction of the cylinder piston rod, the two baffle plates 5 are moved closer or further apart, thereby adjusting the distance between the two baffle plates 5 and changing the flow rate of the exhaust air. Linkage Unit 7 includes a hinge link structure 70 and a slide rod 71. The hinge link structure 70 is arranged between adjacent inertial filter plates 40 and consists of several hinges and links. Adjacent inertial filter plates 40 are connected by hinges and links, enabling the inertial filter plates 40 to move synchronously. The slide rod 71 is horizontally arranged, with both ends welded to the inner walls of the two sides of the exhaust filter pipe 2. The slide rod 71 passes through several sliding holes opened on the inertial filter plates 40 in sequence. The slide rod 71 and the inertial filter plates 40 are fitted with a clearance to ensure that the inertial filter plates 40 can slide smoothly along the slide rod 71. Two of the inertial filter plates 40 located on both sides are connected to the piston rod of the cylinder via connecting arms. One end of the connecting arm is fixedly connected to the inertial filter plate 40, and the other end is bolted to the piston rod. When the cylinder drives the baffle plate 5 to move, the piston rod simultaneously drives the inertial filter plates 40 on both sides to move along the slide rod 71. Under the action of the hinge linkage structure 70, all the inertial filter plates 40 adjust their spacing synchronously. A sensor for detecting particle concentration is also arranged at the inlet end of the exhaust filter pipe 2, installed on the inner wall of the exhaust filter pipe 2, with its detection probe facing the direction of airflow. The sensor is electrically connected to a controller (such as a PLC controller, model S7-200), and the controller is electrically connected to the control valve of the cylinder. When the sensor detects a high particle concentration, it transmits a signal to the controller, which controls the control valve of the cylinder to actuate, causing the piston rod to retract and move the two baffle plates 5 closer together, reducing the distance between them and accelerating the airflow. At the same time, the linkage 7 reduces the distance between the inertial filter plates 40, enhancing the inertial filtration effect. When the particle concentration is low, the controller controls the distance between the baffle plates 5 to increase, and the distance between the inertial filter plates 40 also increases accordingly, reducing airflow resistance.

[0026] Main filtration unit 3 Frame 31: Employs a metal frame structure, bolted to the inside of the exhaust filter pipe 2, located downstream of the pre-filtration mechanism 4. The dimensions of frame 31 match the cross-section of the exhaust filter pipe 2, ensuring that all airflow can pass through the filter screen 30 for filtration. Filter 30: Located on the frame 31, this multi-layer composite filter 30 consists of a metal wire mesh and non-woven fabric. The metal wire mesh provides support, while the non-woven fabric offers high filtration precision, effectively filtering out fine particles not captured by the pre-filtration mechanism 4. The filter 30 is sealed to the frame 31 with sealant to prevent unfiltered airflow from escaping through the gaps. Static pressure probe 32: Integrated into the frame 31, it includes an L-shaped probe made of copper. The side hole at the probe end has a diameter of 1mm for measuring static pressure; the center hole at the other end has a diameter of 2mm and is connected to a pressure sensor (model MPX5700) via a long tube (made of polytetrafluoroethylene). The L-shaped probe is fixed through a connection hole in the frame using a threaded connection for easy installation and replacement. Static pressure probe 32 is located upstream of filter screen 30 to measure the pressure upstream of filter screen 30. The downstream pressure can be a set reference value, or a probe can be simultaneously placed downstream, such as at the outlet of exhaust filter pipe 2 to measure the pressure downstream of filter screen 30. Both pressure sensors are electrically connected to the controller, which calculates the pressure difference before and after filtration. When the pressure difference exceeds a set threshold, it indicates severe clogging of filter screen 30, and the controller issues an alarm signal to remind personnel to clean or replace filter screen 30 promptly. Working principle The particulate-containing gas discharged from the deaerator first enters the deaerator exhaust pipe 1, and then flows into the inlet end of the exhaust filter pipe 2. At this time, the particulate concentration sensor at the inlet end detects the particulate concentration in the airflow and transmits the signal to the controller. The controller controls the drive unit 6 (cylinder) to operate according to the particulate concentration signal, adjusting the distance between the two baffles 5 of the baffle assembly, and simultaneously adjusting the distance of the inertial filter plate 40 through the linkage 7. When the airflow passes through the baffle assembly, the airflow velocity changes due to the action of the baffle 5. Subsequently, the airflow enters the inertial filtration section of the pre-filtration mechanism 4. As it flows through the multi-stage bending structure of the inertial filter plate 40, the airflow direction changes continuously, while the particles, due to inertia, continue to maintain their original direction of motion and collide with the groove-shaped capture area of ​​the inertial filter plate 40 and are captured. Over time, the particles captured on the inertial filter plate 40 will fall off under the influence of gravity and enter the collection box 41 through the collection port 410 at the top of the collection box 41. The particles slide down the staggered guide plates 411 inside the collection box 41 and eventually fall to the bottom of the collection box 41. The pre-filtered airflow continues to the main filtration mechanism 3, where it undergoes further filtration through the filter screen 30 on the frame 31, removing any remaining fine particles. Simultaneously, the static pressure probe 32 measures the pressure difference across the filter screen 30 in real time and transmits the data to the controller, allowing operators to monitor the clogging status of the filter screen 30. The filtered clean gas is discharged from the outlet of exhaust filter pipe 2, completing the entire filtration process.

[0027] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. An exhaust gas filtration device for a deaerator, comprising: Deaerator exhaust pipe (1), the exhaust end of which is connected to an exhaust filter pipe (2); Its characteristic is that it further includes: The main filtration mechanism (3) is located at the end of the exhaust filter pipe (2) away from the deoxygenated exhaust pipe, and the main filtration mechanism (3) includes a filter screen (30); A pre-filtering mechanism (4) is disposed in the exhaust filter pipe (2) and located upstream of the main filter mechanism (3); The pre-filter mechanism (4) captures particles contained in the exhaust gas flow through inertia.

2. The exhaust gas filtration device for a deaerator according to claim 1, characterized in that, The pre-filtration mechanism (4) further includes: An inertial filtration section, which is composed of a plurality of inertial filter plates (40); A collection box (41) is provided at the bottom of the exhaust filter pipe (2); The collection box (41) is located directly below the inertial filter section and has a collection port (410) at the top of the collection box (41) that communicates with the interior of the exhaust filter pipe (2). Several inertial filter plates (40) are evenly spaced along the width direction of the exhaust filter pipe (2). The inertial filter plates (40) cause the particles contained in the exhaust airflow to collide with and be captured on the inertial filter plates (40) by inertial force.

3. The exhaust gas filtration device for a deaerator according to claim 2, characterized in that, Also includes: The baffle assembly consists of two baffles (5) symmetrically distributed along the width direction of the exhaust filter pipe (2). The two baffles (5) are controlled by a drive unit (6) to move closer to or separate from each other to adjust the flow rate of the exhaust airflow. Linkage unit (7), which is used to transmit the driving force of the baffle plate (5) to the inertial filter unit to synchronously adjust the spacing of a plurality of inertial filter plates (40); The baffle assembly is located at the air inlet end of the exhaust filter pipe (2).

4. The exhaust gas filtration device for a deaerator according to claim 3, characterized in that, The collection box (41) also includes: Guide plate (411), the guide plate (411) has two pieces and is distributed vertically and horizontally in the collection box (41); The guide plates (411) are distributed at an angle from top to bottom. The high side of the guide plate (411) is connected to the inner wall of one side of the collection box (41). A material discharge gap is formed between the low side of the guide plate (411) and the inner wall of the other side of the collection box (41). The two guide plates (411) are staggered in the width direction of the collection box (41).

5. The exhaust gas filtration device for a deaerator according to claim 1, characterized in that, The main filtration mechanism (3) also includes: A frame (31) is installed in the exhaust filter pipe (2), and a static pressure probe (32) is integrated on the frame (31) for measuring the pressure difference before and after filtration. The filter (30) is disposed on the frame (31).

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