Combined polar plate for eliminating fine particle dust of electrostatic dust collector and dust collection method

Abstract

The invention relates to a combined polar plate for eliminating fine particle dust of an electrostatic dust collector and a dust removal method, the combined polar plate comprises a dust collector shell with an input section, a working section and an output section which are sequentially arranged, a plurality of strip-shaped polar plates are at least divided into two polar plate groups, and the polar plates in the polar plate groups are connected in series through connecting rods; the polar plate groups are mounted in a manner that the centers of the strip-shaped polar plates are used as axes, and the polar plate groups rotate around the axes and are uniformly distributed at different phases, so that the polar plate groups form phase differences; and the polar plate plane of each strip-shaped polar plate and the airflow direction form a dust collection angle. The included angles are formed between the long-strip-shaped polar plates and flue gas flow, so that disturbance is generated when the gas flow flows through the polar plates, meanwhile, the polar plates are divided into a plurality of groups and installed at different phase angles, the effect of disturbing the gas flow is further generated, the electrostatic dust adsorption force is increased, and the dust removal efficiency is improved. And the specific dust collection area of the electric field is increased by 10-15% under the condition of not changing the equipment appearance and the power supply type selection, so that the equipment is ensured to reach the environmental protection standard.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of combination electrode plate and dust removal method of electrostatic precipitator eliminating fine particle dust, it is a kind of environmental protection equipment and dust removal process method for combustion furnace flue gas dust removal, it is a kind of key components and dust removal method of electric dust removal facility. BACKGROUND

[0002] Compared with other dust removal equipment, electrostatic precipitator has the advantages of high degree of automation, low energy consumption, high dust removal efficiency, and can be used to remove 1-50 μm dust in flue gas, and can be used in high temperature and high pressure occasions.Practice shows that the larger the amount of flue gas treated, the more economical the investment and operating cost of using electrostatic precipitator.The disadvantages are large initial investment, complex equipment, large floor area, strict requirements for operation, operation, maintenance and management, and dust removal may cause dust to fly again.

[0003] The discharge concentration of traditional electrostatic precipitator needs to increase the number of electric field and increase the specific dust collection area of equipment to meet the discharge requirements, which is low in cost performance and unreasonable when handling small amount of flue gas.How to greatly improve the efficiency of electrostatic precipitation within the volume range of traditional dust collector and with limited increase in funds is a problem to be solved. SUMMARY

[0004] In order to overcome the problems of the prior art, the present application provides a kind of combination electrode plate and dust removal method of electrostatic precipitator eliminating fine particle dust.The combination electrode plate and dust removal method adopt the dust collection angle of electrode plate, and form phase angle by grouping electrode plate, effectively forming the flow around of flue gas flow process, and improving the dust removal efficiency.

[0005] The purpose of the present application is achieved by a kind of combination electrode plate of electrostatic precipitator eliminating fine particle dust, comprising: dust collector shell of input section, working section, output section arranged in sequence, a plurality of long strip-shaped electrode plates are arranged in the working section, the plurality of long strip-shaped electrode plates are divided into at least two electrode plate groups, and each electrode plate in the electrode plate group is connected by connecting rod in series;Each of the electrode plate group is installed in the following manner: taking the center of long strip-shaped electrode plate as the axis, each electrode plate group is rotated around the axis with different phases to be evenly distributed, so that each electrode plate group forms a phase difference;The electrode plate plane of each long strip-shaped electrode plate forms a dust collection angle with the direction of airflow.

[0006] Further, the cross-sectional shape of the working section of the dust collector shell is one of circular, regular polygon and rectangular.

[0007] Further, the cross-sectional shape of the long strip-shaped electrode plate is that there is a semicircular reinforcing rib in the middle and the edges on both sides are rolled up.

[0008] Further, the width of the long strip-shaped electrode plate is 50-100 mm, and the length is ≤3 m.

[0009] Furthermore, the distance between the elongated electrode plates is 50-55 mm.

[0010] Furthermore, the working section of the dust collector housing has a rectangular cross-sectional shape, and there are two electrode plate groups. One electrode plate group has long strip-shaped electrode plates installed horizontally, and the other electrode plate group has long strip-shaped electrode plates installed vertically.

[0011] Furthermore, the dust collection angle between the elongated electrode plate and the airflow direction is 15-20 degrees.

[0012] Furthermore, the electrode assembly is provided with a multi-layered longitudinal and transverse frame.

[0013] Furthermore, the multi-layered longitudinal and transverse frame is equipped with multiple vibratory hammers.

[0014] A method for removing fine particulate dust using an electrostatic precipitator with the above-mentioned combined electrode plates: The steps of the method are as follows: Step 1, flue gas enters the dust collector: the flue gas velocity decreases when it enters the working section after passing through the flared inlet of the input section; Step 2, flue gas enters the electrode plate group: In the first electrode plate group, the flue gas changes under the action of the dust collection angle, forming an uneven airflow on the two sides of the long strip electrode plate. The flow velocity on one side is fast and the flow velocity on the other side is slow. When the two airflows converge after flowing through the long strip electrode plate, they are agitated due to the difference in flow velocity. This agitation is equivalent to prolonging the treatment time of fine particulate dust caused by secondary dust. Step 3, flue gas enters different electrode groups: Due to the phase difference between electrode groups, the flue gas will form turbulence again when passing between electrode groups of different phases, which will further prolong the treatment time of fine particulate dust. Step 4, flue gas discharge: The flue gas adsorbed by electrostatics is discharged through the output section.

[0015] The advantages and beneficial effects of this invention are as follows: This invention forms an angle between the elongated electrode plate and the flue gas flow, thereby generating disturbance when the airflow passes over the electrode plate. At the same time, the electrode plate is divided into multiple groups and installed with different phase angles, which further generates the effect of disturbing the airflow. This agitation is equivalent to extending the treatment time of fine particulate dust and increasing the electrostatic adsorption of dust. Without changing the shape of the equipment and the power supply selection, the specific dust collection area of ​​the electric field is increased by 10-15%, ensuring that the equipment meets environmental protection standards. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] Figure 1This is a schematic diagram of the electrostatic precipitator with four sets of electrode plates as described in Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the I group of electrode plates of the four groups described in Embodiment 1 of the present invention. Figure 1 Sectional view of AA in the middle; Figure 3 This is a schematic diagram of the second group of electrode plates in the four groups of electrode plates described in Embodiment 1 of the present invention. Figure 1 Cross-sectional view of the middle section (BB); Figure 4 This is a schematic diagram of the third group of electrode plates in the four groups of electrode plates described in Embodiment 1 of the present invention. Figure 1 CC section view; Figure 5 This is a schematic diagram of the VIth group of the four groups of electrode plates described in Embodiment 1 of the present invention. Figure 1 Cross-sectional view of DD in the middle; Figure 6 This is a perspective view of the vertically arranged electrode plate assembly as described in Embodiment 1 of the present invention; Figure 7 This is a perspective view of the horizontally arranged electrode plate assembly described in Embodiment 1 of the present invention; Figure 8 This is a cross-sectional schematic diagram of the elongated electrode plate described in Embodiment 3 of the present invention. Figure 2 Cross-sectional view of FF; Figure 9 This is a schematic diagram of the two sets of electrode plates described in Embodiment 7 of the present invention; Figure 10 This is a schematic diagram of the horizontally arranged electrode plate assembly described in Embodiment 7 of the present invention. Figure 9 Cross-sectional view of GG in China; Figure 11 This is a schematic diagram of the vertically arranged electrode plate assembly described in Embodiment 7 of the present invention. Figure 9 Cross-sectional view of HH section; Figure 12 This is a schematic diagram of the position of one layer of the multi-layer longitudinal and transverse frame and the vibratory hammer in embodiments eight and nine of the present invention; Figure 13 This is a flowchart of the dust removal method described in Embodiment 10 of the present invention. Detailed Implementation

[0018] Example 1: This embodiment describes a combined electrode plate for an electrostatic precipitator to eliminate fine particulate dust, such as... Figure 1 As shown. This embodiment includes: a dust collector housing consisting of an input section 1, a working section 2, and an output section 3 arranged sequentially. The working section contains multiple elongated electrode plates 2011, and these elongated electrode plates are divided into at least two groups of electrode plates (…). Figure 1There are four groups of electrode plates: Group I electrode plate group ( Figure 2 Group II electrode group ( Figure 3 Group III electrode group ( Figure 4 Group VI of the electrode group ( Figure 5 The elongated electrode plates in the electrode assembly are connected in series by connecting rods 2012, such as... Figure 6 , 7 As shown; the installation method of each electrode group is as follows: with the center of the long strip electrode as the axis 2013, each electrode group rotates around the axis and is evenly distributed with different phases, so that each electrode group forms a phase difference (see Figures 2-5 (The phase difference between the four sets of elongated plates in the figure is 45 degrees); the plate plane (line) 2015 of each of the elongated plates forms a dust collection angle with the airflow direction E. α ,like Figure 1 , 6 As shown in Figures 7 and 8.

[0019] This embodiment changes the electrode plate to be inclined instead of the traditional method where the electrode plate plane is parallel to the flue gas flow, so that the contact surface between the flue gas and the electrode plate is larger, and the electrostatic adsorption efficiency is higher. At the same time, the electrode plates are grouped, and the installation phase of different groups of electrode plates is different, thereby generating a stirring effect on the flue gas and improving the electrostatic adsorption effect of the long strip electrode plate.

[0020] Angle of tilt of the electrode plate α Called a dust collection corner, such as Figure 1 The figure shows the angle between the plate plane and the flue gas flow direction. It should be noted that the flue gas flow direction here refers to the overall flow direction of the flue gas, excluding turbulence caused by various factors. The longitudinal axis 2014 of the elongated substrate is perpendicular to the airflow direction, as shown... Figure 6 , 7 As shown This embodiment borrows the concept of phase in alternating current to describe the installation characteristics of the electrode assembly: one side of the long strip electrode is perpendicular to the airflow direction, and it rotates around the center line (which can be the center of gravity) to form different phase angles. β The four electrode groups are rotated 45 degrees in succession. The phase angle of electrode group I is... β =0, phase angle of plate group II β =45, Phase angle of plate group III β =90, Phase angle of plate group VI β =135, as Figure 2 , 3 As shown in Figures 4 and 5, this creates a phase difference, promoting contact between the elongated electrode and the flue gas, and enhancing the adsorption effect. The phase angles of each electrode group do not need to be arranged in order of magnitude, as long as the overall phase angles of each electrode group are uniform on the circumference.

[0021] The cross-sectional shape of the dust collector housing described in this embodiment can be circular or rectangular. If the installation phase difference between the electrode groups is between 0 and 90 degrees, a cylindrical or regular polygonal shape is preferred; if the phase difference between the electrode groups is 90 degrees, a square shape can be used.

[0022] The most important aspect of elongated electrode plates is maintaining the strength of the strip shape and preventing bending. Therefore, the elongated electrode plates should be reinforced with multiple ribs to ensure that the plates remain straight.

[0023] The elongated electrode plates are strung together by connecting rods to form a grid-like structure. The two ends of the connecting rods are welded to the frame, and the multi-layered frame forms a complete electrode array. The connecting rods can be straight or curved to fit the cylindrical outer shell.

[0024] To remove the dust accumulated on the electrode plates, a rapping hammer can be installed on the frame supporting the electrode plates to shake off the dust through vibration.

[0025] Example 2: This embodiment is an improvement on Embodiment 1, and is a refinement of Embodiment 1 regarding the dust collector housing. The cross-sectional shape of the working section of the dust collector housing described in this embodiment is one of a circle, a regular polygon, or a rectangle.

[0026] The cross-sectional shape of the working section of the dust collector shell is determined by the arrangement of the internal elongated electrode plates, such as... Figures 2~5 The image shows a working section with a circular cross-sectional shape. This elongated electrode plate configuration can also be achieved using a dust collector housing working section with a regular octagonal cross-sectional shape.

[0027] Example 3: This embodiment is an improvement upon the above embodiment, a refinement of the elongated electrode plate. The cross-sectional shape of the elongated electrode plate in this embodiment is: a semi-circular reinforcing rib 20111 in the middle, and rolled-up edges on both sides 20112, as shown below. Figure 8 As shown.

[0028] The elongated electrode plate shown in this embodiment can be made of SPCC with a thickness of 1-1.5mm. It is formed by rolling using a special rolling mill. The shape and length are determined by the system's process parameters and computer software simulation, and finally confirmed in conjunction with the working conditions. This ensures both product performance and overall strength after forming. Multiple small electrode plates are combined to form an electrode plate assembly, preparing for the subsequent assembly of composite electrode plates.

[0029] Example 4: This embodiment is an improvement on the above embodiment, and is a refinement of the above embodiment regarding the elongated electrode plate. The elongated electrode plate described in this embodiment has a width of 50-100mm and a length of ≤3m.

[0030] The width and length of the elongated electrode plate are determined based on the actual usage.

[0031] Example 5: This embodiment is an improvement on the above embodiment, and is a refinement of the above embodiment regarding the elongated electrode plates. The distance between the elongated electrode plates in this embodiment is 50-55mm.

[0032] The distance between the elongated electrode plates is determined by the connecting rod. The connecting rod passes through the holes on the spine of the elongated electrode plates and is securely welded around the holes (20113, as shown). Figure 8 As shown.

[0033] Example 6: This embodiment is an improvement upon the above embodiment, a refinement of the elongated electrode plate. The dust collection angle between the elongated electrode plate and the airflow direction described in this embodiment... α It should be 15-20 degrees Celsius, such as Figure 1 , 6 As shown in Figures 7 and 8.

[0034] Without altering the structural volume of the equipment, the elongated electrode plates are installed at a dust collection angle of 15–20°. α This can increase the specific dust collection area of ​​the electric field by 10-15%, maximizing the collection of fine particulate dust, especially fine dust of about 1μm caused by secondary dust, further reducing the difficulty of subsequent environmental protection facilities in treating dust and ensuring that the system's particulate matter emissions meet standards.

[0035] Example 7: This embodiment is an improvement upon the above embodiment, refining the electrode plate assembly. In this embodiment, the working section of the dust collector housing has a rectangular cross-sectional shape, and the electrode plate assembly consists of two plates, with the elongated electrode plates of one assembly installed horizontally. Figure 6 , 9 As shown in Figure 10, another set of electrode groups has long strip-shaped electrode plates installed vertically, such as... Figure 7 , 9 As shown in Figure 11.

[0036] In this embodiment, the two sets of electrode plates are positioned in a specific relative position, with a phase angle of 90 degrees, meaning the elongated electrode plates in each set are perpendicular to each other. The lengths of the two sets of electrode plates can be identical, allowing the dust collector housing to be designed as rectangular. The advantage of this design is its simple structure and low manufacturing cost. The disadvantage is that airflow is poor near the right-angled edges of the housing, easily leading to dust accumulation at the four corners. This drawback can be mitigated through a well-designed airflow channel.

[0037] Example 8: This embodiment is an improvement upon the above embodiment, a refinement of the electrode assembly described above. The electrode assembly in this embodiment has multiple layers of longitudinal and transverse frames, such as... Figure 12 As shown.

[0038] In some large-scale combustion furnace flue gas systems, the electrode design of electrostatic precipitators is quite large, with lengths and widths reaching tens of meters or even larger. However, due to their inherent function, the elongated electrode plates cannot be too long. Therefore, a frame is needed to fix the elongated electrode plates, and then the frame is fixed to other components of the dust collector to form a complete and robust whole. This fixing can be designed in a fishbone shape, such as... Figure 12 As shown, a main frame 401 is set in the middle of the frame, and two long wings 402 extend from both sides, which are stacked together in multiple layers to form a three-dimensional longitudinal and transverse frame. Figure 12 The diagram only shows the structure of one layer of the frame; in reality, multiple layers of such frames should be stacked to form a three-dimensional frame structure. The frame uses steel profiles, which are then fixed together using bolts, riveting, or welding to form a sturdy, integrated frame capable of withstanding the vibration of a vibratory hammer.

[0039] Example 9: This embodiment is an improvement upon the above embodiment, a refinement of the multi-layered longitudinal and transverse frame. In this embodiment, the multi-layered longitudinal and transverse frame is equipped with multiple vibratory hammers 403, such as... Figure 12 As shown.

[0040] The aforementioned rapping hammer is a device that converts electrical, hydraulic, or pneumatic energy into vibrational energy, using vibration to remove dust accumulated on elongated electrode plates. The rapping hammer can provide low-frequency or high-frequency vibration. Low-frequency vibration is typically a few times per minute, with a relatively large vibration amplitude, equivalent to manually striking the electrode plates, causing the dust to fall. High-frequency vibration utilizes the principle of resonance, primarily removing smaller dust particles. The rapping hammer is usually mounted at the end of a frame, utilizing the long arms on both sides of the frame to create a better vibration effect.

[0041] Example 10: This embodiment describes a dust removal method for the combined electrode plates of the electrostatic precipitator described in the above embodiment, used to remove fine particulate dust. The steps of the method are as follows, and the process is as follows: Figure 13 As shown: Step 1, flue gas enters the dust collector: the flue gas enters the working section through the flared inlet of the input section and the flow rate decreases.

[0042] The flow rate of flue gas slows down when it passes through the flared opening, which helps to reduce dust.

[0043] Step 2, flue gas enters the electrode plate group: In the first electrode plate group, the flue gas changes under the action of the dust collection angle, forming an uneven airflow on the two sides of the long strip electrode plate. The flow velocity on one side is fast and the flow velocity on the other side is slow. When the two airflows converge after flowing through the long strip electrode plate, they are agitated due to the difference in flow velocity. This agitation is equivalent to prolonging the treatment time of fine particulate dust caused by secondary dust.

[0044] This step utilizes the pressure difference created by the airflow passing over the plane, thereby generating disturbance in the incoming airflow.

[0045] Step 3: Flue gas enters different electrode groups: Due to the phase difference between electrode groups, the flue gas will form turbulence again when passing between electrode groups of different phases, which will further prolong the treatment time of fine particulate dust.

[0046] This step occurs after step 2 when the flue gas begins to enter the electrostatic precipitator, but occurs simultaneously with step 2 during the continuous flue gas treatment process.

[0047] Step 4, flue gas discharge: The flue gas adsorbed by electrostatics is discharged through the output section.

[0048] Finally, it should be noted that the above is only used to illustrate the technical solution of the present invention and not to limit it. Although the present invention has been described in detail with reference to the preferred arrangement, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of the present invention (such as the shape of the electrostatic precipitator, the form of the combustion furnace, the order of steps, etc.) without departing from the spirit and scope of the technical solution of the present invention.

Claims

1. A combined electrode plate for an electrostatic precipitator to remove fine particulate dust, comprising: The dust collector housing consists of an input section, a working section, and an output section arranged sequentially. The working section contains multiple elongated electrode plates. The elongated electrode plates are characterized by being divided into at least two groups, with each electrode plate in each group connected in series by a connecting rod. Each electrode plate group is installed such that, with the center of the elongated electrode plate as its axis, each group rotates around the axis and is evenly distributed with different phases, creating a phase difference between the groups. The plane of each elongated electrode plate forms a dust collection angle with the airflow direction.

2. The combined electrode plate according to claim 1, characterized in that, The cross-sectional shape of the working section of the dust collector shell is one of a circle, a regular polygon, or a rectangle.

3. The combined electrode plate according to claim 2, wherein the cross-sectional shape of the elongated electrode plate is: a semi-circular reinforcing rib in the middle and rolled-up edges on both sides.

4. The combined electrode plate according to claim 3, characterized in that, The width of the elongated electrode plate is 50-100mm and the length is ≤3m.

5. The combined electrode plate according to claim 4, characterized in that, The distance between the elongated electrode plates is 50-55 mm.

6. The combined electrode plate according to claim 5, characterized in that, The working section of the dust collector housing has a rectangular cross-sectional shape. There are two electrode groups: one group has long strip-shaped electrode plates installed horizontally, and the other group has long strip-shaped electrode plates installed vertically.

7. The combined electrode plate according to claim 6, characterized in that, The dust collection angle between the elongated electrode plate and the airflow direction is 15~20 degrees.

8. The combined electrode plate according to claim 7, characterized in that, The electrode assembly is provided with a multi-layered longitudinal and transverse frame.

9. The combined electrode plate according to claim 8, characterized in that, The multi-layered longitudinal and transverse frame is equipped with multiple vibratory hammers.

10. A dust removal method for eliminating fine particulate dust using an electrostatic precipitator with the combined electrode plates of claim 1: the method comprises the following steps: Step 1, flue gas enters the dust collector: the flue gas velocity decreases when it enters the working section after passing through the flared inlet of the input section; Its features are, Step 2, flue gas enters the electrode plate group: In the first electrode plate group, the flue gas changes under the action of the dust collection angle, forming an uneven airflow on the two sides of the long strip electrode plate. The flow velocity on one side is fast and the flow velocity on the other side is slow. When the two airflows flow through the long strip electrode plate and then converge, they are agitated due to the difference in flow velocity. This agitation is equivalent to prolonging the treatment time of fine particulate dust caused by secondary dust. Step 3, flue gas enters different electrode groups: Due to the phase difference between electrode groups, the flue gas will form turbulence again when passing between electrode groups of different phases, which will further prolong the treatment time of fine particulate dust. Step 4, flue gas discharge: The flue gas adsorbed by electrostatics is discharged through the output section.

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