CN205518212U - Tube bundle dust removal defogging device - Google Patents

Abstract

The utility model discloses a tube bundle type dust and mist removal device with wet electric dust removal function. The wall of the guide cylinder on the upper part of the tube bundle dust and fog removal device is used as the anode plate, and the cathode tube is set in the center of the tube bundle type dust and fog removal device, forming a stable electric field between the anode plate and the central cathode tube to realize the tube bundle dust removal. The charging operation of dust particles and slurry droplets in the flue gas in the fog device, the charged dust particles and slurry droplets move in the direction of the anode plate in the electric field, so that the tube-bundle dust and fog removal device can remove dust particles and slurry droplets The efficiency is greatly improved, especially the removal effect of airgel and Hg ⁰ , which are difficult to remove by general physical removal processes, is greatly improved.

Description

A tube-bundle dust and mist removal device

technical field

The utility model relates to the technical field of dust removal and fog removal, in particular to a tube bundle type dust removal and fog removal device with wet electric dust removal function.

Background technique

At present, the dust and mist removal effect of the dust collector can reach 5mg/Nm ³ , but its physical removal mechanism also limits its ability to obtain higher removal efficiency and removal effect. For example, a deep dedusting and demisting device (patent number: CN201420674592.0) is a single physical separation and removal mechanism. The removal efficiency is low, and the removal effect on pollutants such as SO ₃ aerogel, NH ₃ aerogel, and Hg ⁰ with smaller particle sizes is basically close to no removal effect. The wet electrostatic precipitator process has a good effect on the removal of this part of the pollutants.

The wet electrostatic precipitator process is a mature and reliable dust removal technology. It is generally used in the deep dust removal and fog removal process of clean flue gas. It can effectively remove small particle size dust particles, slurry droplets, especially airgel, Hg ⁰ and other pollutants. However, the weight and volume of the existing wet electrostatic precipitator are huge and cannot be installed in the desulfurization tower. For example, CN201410171136 is a flue gas deep purification device and its application. By optimizing the process layout, the device realizes the integrated application of flue gas conditioning, desulfurization electric demisting, and wet electrostatic precipitator. Through flue gas conditioning, desulfurization electric demisting The synergistic effect of wet electrostatic precipitator and wet electrostatic precipitator can realize ultra-low emission of fine particles and real near-zero emission. But this device is suitable for large-scale industrial application, and it can only be realized when the new absorption tower is designed according to this process route.

In addition, the "fog eliminator + wet electrostatic precipitator" process uses a high-voltage electric field to capture fog droplets and dust particles. There are many high-voltage electrical equipment in the equipment, and the electrode wires are made of high-grade alloy materials. The construction cost is high and the power consumption for operation is high. Big. For example, CN201310670077.5 is an electric demisting method and device for capturing fine particles in flue gas after wet desulfurization.

Utility model content

The utility model solves the problem of removing and defogging pollutants with small particle diameters in the flue gas, and provides a tube-bundle type dedusting and demisting device aiming at the above-mentioned state of the prior art.

The purpose of this utility model is achieved through the following technical solutions:

A tube-bundle dust and mist removal device, comprising a guide tube, m separators, m ≥ 1, the guide tube is a vertically placed circular tube with a smooth inner wall; the separator includes several smooth surface The blades and the smooth outer central cylinder are vertically arranged vertically to the wall of the guide cylinder; a cathode tube and a power supply are also included, and the upper part of the inner wall of the guide cylinder is set as an anode plate electrically connected to the power supply, wherein,

The cathode tube is a tubular object fixed with p cathode wires, set on the center line of the diversion tube and vertically passing through the separator, p≥1;

The upper part of the cathode tube is the power access section, and the lower part of the cathode tube is the electric field charging section.

Further, the material of the upper part of the inner wall of the guide cylinder is a conductive material.

Further, the lower part of the draft tube is provided with n separators, and the separators are located below the bottom of the cathode tube, n≥0.

Further, the aspect ratio of the guide tube is not less than 6.

Further, the height of the anode plate accounts for 20%-100% of the total height of the draft tube.

Further, the cross section of the cathode tube is less than 10% of the cross section of the draft tube.

Further, the power supply connection section of the cathode tube accounts for 1% to 10% of the total length of the cathode tube, and the vertical height of the electric field charging section of the cathode tube accounts for 15% to 100% of the height of the guide tube.

Further, the cathode wires of the cathode tubes are arranged in a spiral arrangement of fishbone needles. The spiral arrangement of fishbone needles means that the cathode wires fixed on the cathode tube are provided with fishbone needles of the same material. discharge tip.

Further, the surface of the cathode tube is smooth and grooved, and the cathode wire is wound in the groove of the cathode tube.

Further, the herringbone needle-shaped discharge tips of the plurality of cathode wires are evenly distributed on the cross-section of the cathode tube.

The beneficial effects of the utility model are:

The utility model combines the physical separation of the ordinary tube bundle dust and mist removal device with the wet electrostatic precipitator, adopts the compound removal mechanism, and realizes the improvement of the removal efficiency and removal effect without increasing the running resistance. The removal efficiency of small-sized dust particles and slurry droplets has been greatly improved, and more importantly, the removal of airgel and Hg ⁰ pollutants that are difficult to deal with by a simple physical removal mechanism has been realized. The utility model has the advantages of simple structure, convenient installation and cost saving.

Description of drawings

Fig. 1 is the schematic diagram that the utility model is installed in the desulfurization absorption tower;

Fig. 2 is the structural representation of the tube bundle type dedusting and demisting device of the present invention;

Fig. 3 is the structural representation of separator of the present utility model;

Fig. 4 is a schematic diagram of the arrangement of a single cathode wire on the cathode tube of the present invention;

5a-5d are schematic diagrams of the arrangement of fishbone spike-shaped discharge tips on multiple cathode lines on the cathode tube of the present invention.

Reference signs: a-wet desulfurization absorption tower; b-bundle-type mist eliminator with wet electrostatic precipitator; c-high-frequency power supply; c1-anode plate power board (closed plate on the tube-bundle type dust and mist removal device); c2-cathode tube power supply (cathode power supply joint);

1-drain tube; 2-cathode tube; 23-cathode wire; 24-fishbone spike-shaped power generation tip; 3-separator; 4-water retaining ring; 21-power access section; 22-electric field charging segment; 23-cathode line; 24-discharge tip; 31-blade; 32-central tube.

detailed description

The specific implementation of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be noted that these specific descriptions are only for those of ordinary skill in the art to understand the present invention more easily and clearly, rather than limiting interpretation of the present invention. .

As shown in Figure 1, the utility model solves the problem of removing pollutants with small particle sizes in the flue gas, and improves the efficiency of dust and fog removal. In practical application, a plurality of tube-bundle dust and mist removal devices b of the utility model are combined side by side in an array, and installed in the desulfurization tower to form a dust and mist removal layer.

The dedusting and mist removal layer is installed above the spray layer a of the wet desulfurization absorption tower. After the original flue gas is washed, cooled and absorbed by the wet desulfurization layer, it becomes saturated and clean flue gas, entraining a large number of liquid droplets, mist droplets and untreated The dust removed by washing enters the tube bundle dust and fog removal device b, and under the action of the mechanical dust removal mechanism composed of the separator and the guide tube at the lower part of the tube bundle dust and fog removal device, most of the large particle size slurry droplets and The fog droplets enter the wet electrostatic precipitator area composed of the anode plate and cathode tube 2 on the upper part of the tube bundle dedusting and mist removal device.

The power supply of wet electrostatic precipitator comes from the external high-frequency power supply c, and its working voltage range is 10KV ~ 150KV. The removal efficiency was adjusted. The anode power supply of the wet electrostatic precipitator supplies power to the anode plate of each tube bundle dust and mist removal device through the upper closed plate c1 of the tube bundle dust and fog removal device; The cathode tubes 2 in each tube bundle dust and mist removal device are powered. Since the mist and dust on the upper part of the tube-bundle dust and mist removal device have been removed, it becomes clean smoke and lacks an environment for short-circuit discharge of the power supply. The risk of electric leakage is eliminated.

As shown in Figure 2, the inner wall of the guide cylinder 1 of the tube bundle type dedusting and mist removal device of the present utility model is used as the anode plate for wet electrostatic precipitator; Uniform distribution of the electric field. Guide tube 1 diameter The height is 800-6000mm, and the aspect ratio is not less than 6; the height of the anode plate accounts for 20%-100% of the total height of the guide tube, and the minimum height is not less than 500mm.

The cathode tube 2 is placed in the center of the guide tube 1, and is positioned and fixed on the separator 3, so that the distance between the anode plate and the cathode tube 2 is constant, and an electric field is formed between the anode plate and the cathode plate 2, and the constant distance ensures the electric field Uniform and stable, so as to realize the charging operation of dust particles and slurry droplets in the flue gas in the device. The charged dust particles and slurry droplets move towards the anode plate in the electric field, which improves the dust removal performance of the tube bundle dust removal and mist removal device. The capture efficiency of particles and slurry droplets, especially the capture efficiency of extremely small dust particles and slurry droplets. However, the addition of wet electrostatic precipitator does not destroy the flue gas flow field and its separation mechanism in the tube-bundle type dust and mist removal device, and the removal effect and removal efficiency of the tube-bundle type itself are still maintained. In this way, the overall removal efficiency and removal effect of the tube-bundle dust and mist removal device can be greatly improved. The setting and fixing of the cathode tubes 2 do not affect the number and spacing of the separators 3 . As an embodiment of the present utility model, the number of separators 3 is 3 (the number of separators can be increased or decreased according to the dust particle removal requirements and efficiency), wherein the cathode tube 2 is fixed on the upper part of the draft tube 1 and the two separated On the device, there is also a separator below the bottom of the cathode tube 2.

The cathode tube 2 is provided with a flow field dead zone in the center of the tube bundle dust and mist removal device, and its cross section is less than 10% of the cross section area of the draft tube. The upper part of the cathode tube 2 is a power supply access section 21, and its lower part is an electric field charging section 22. The power supply access section 21 accounts for 1% to 10% of the total length of the cathode tube, and the vertical height of the electric field charging section 22 accounts for 1% of the total length of the cathode tube. 15% to 100% of the height of the cylinder 1. The flow velocity of the flue gas in the charging section 22 of the electric field is close to 0m/s, and dust particles, slurry droplets, etc. are rarely deposited on the surface of the cathode tube 2, so as to realize the continuous and stable charging effect of the cathode tube 2 and reduce the flushing of the cathode tube 2 Frequency and flushing intensity.

As an embodiment of the present invention, the bottom of the cathode tube 2 is higher than the bottom of the guide tube 1 , and a separator is provided at the lower part of the guide tube 1 and the bottom of the cathode tube 2 . This separator is located below the bottom of the cathode tube 2 and is not passed through by the cathode tube 2, thereby forming a structure for mechanical dust removal and mist removal, which coexists with the dust removal electric field. The dust removal electric field formed by the anode plate and the cathode tube 2 requires that the concentration of mist droplets entrained in the flue gas entering the wet electric dust removal field is small, so as to avoid the formation of a continuous conductor between the cathode tube 2 and the anode plate, causing the anode plate and the cathode A short circuit discharge occurs between the tubes 2. Therefore, for the flue gas with a large content of dust and mist droplets, it is required to use the separator 3 and the lower guide tube 1 to perform mechanical dedusting and demisting pre-removal, and then enter the dust removal electric field section for the next step of dust removal and demisting work. Of course, multiple separators may be arranged at the bottom of the draft tube 1 and the bottom of the cathode tube 2, or no separator may be provided, depending on the content of dust and mist in the flue gas.

The electric field height, voltage, power density and other conditions of the anode plate and the cathode tube 2 are related to the service conditions and service requirements. Generally speaking, the higher the requirements for removal efficiency and removal effect, the higher the requirements for electric field height, voltage, power density, etc.; The working voltage, power density, etc. are reduced until they are completely out of operation, so as to achieve the purpose of energy saving.

The tube bundle dust and mist removal device also includes a water retaining ring 4, the water retaining ring 4 is an annular component with a certain thickness and height, attached to the inner wall of the guide tube 1, and used to control the flow guide tube 1 The height of the liquid film layer attached to the inner wall.

As shown in Fig. 3, the separator 3 is an airflow guiding part for the flow of flue gas from the dedusting and demisting device to change from the top-down movement direction to the high-speed rotation movement, and is composed of blades 31 and a central tube 32. Several vanes 31 of the separator 3 are uniformly distributed at a certain inclination angle in the annular area between the outer wall of the central cylinder 32 and the inner wall of the guide cylinder 5 . The height of the separator is 30-200 mm, and its height is determined by the diameter of the guide tube 1 and the inclination angle of the separator blades. The central cylinder 32 is a circular cylinder with a smooth exterior and a closed top. The blade 31 is a thin sheet-shaped curved fan-shaped part with a smooth surface.

As shown in Fig. 4, 5a-5d, n (n≥1) tubular objects of cathode wires 23 are fixed on the cathode tube 2, and the cathode wires 23 are made of corrosion-resistant alloy. As an embodiment of the present utility model, the cathode wires 23 are arranged in a spiral arrangement of fishbone needles; the cathode wires 23 are alloy steel strips with a thickness of 0.5-5 mm and a width of 5-15 mm. There is a fishbone needle-like discharge tip 24 of the same material; a groove is provided on the cathode tube 2 (or no groove is required), and the cathode wire 23 is spirally wound in the groove of the cathode tube 2 in a fishbone needle-like shape. The surface of the outer cathode tube of the discharge tip 24 is a smooth wall surface; the herringbone needle-shaped discharge tip 24 of each cathode line 23 is evenly distributed on the cross-sectional view of the cathode tube 2, and does not differ from the herringbone needles of other cathode lines 23. The thorn-shaped discharge tips 24 overlap, that is, the fishbone needle-shaped discharge tips 24 of the same cathode line 23 are consistent and do not overlap with the fishbone needle-shaped discharge tips 24 of other cathode lines 23 . The vertical distance between any adjacent herringbone needle-like discharge tips 24 is not less than 50mm and not more than 200mm. The length from the herringbone needle-like discharge tip 24 to the center of the cathode tube 2 does not exceed 100% of the diameter of the cathode tube 2; Simply put, the greater the concentration of dust and mist droplets in the overcurrent flue gas, the higher the removal efficiency requirements, the greater the number of cathode wires 23, the smaller the helical pitch of cathode wires 23, and the fishbone acupuncture The denser the discharge tips 24 are, the smaller the distance between adjacent tips is.

5a-5d show four embodiments of the herringbone needle-like discharge tip 24 of the present invention. Figure 5a shows the situation where four herringbone needle-like discharge tips 24 are located at 0 degrees, 90 degrees, 180 degrees, and 270 degrees respectively; the positions of the four fishbone needle-like discharge tips 24 in Figures 5b and 5c deviate from horizontal or vertical Direction; Figure 5d shows the situation of 12 herringbone needle-like discharge tips 24.

The arrangement form of the cathode wires 23 of the present utility model can also be a star-shaped wire, or a sawtooth spiral wire. The cathode wire 23 is made of corrosion-resistant alloy.

Through the above method, the beneficial effect of the utility model is: on the basis of not increasing the running resistance, the removal efficiency and removal effect of the deep dust removal and mist removal device are improved, not only small-sized dust particles and slurry droplets are removed The removal efficiency has been greatly improved, and more importantly, the removal of airgel and Hg ⁰ pollutants that are difficult to deal with by a simple physical removal mechanism has been achieved.

Finally, it should be noted that the above description is only the best embodiment of the utility model, and does not limit the utility model in any form. Any person familiar with the art, without departing from the scope of the technical solution of the present utility model, can make many possible changes and simple replacements to the technical solution of the present invention by using the methods and technical contents disclosed above, all of which belong to the technical solution of the utility model. The scope of protection for new technical solutions.

Claims (10)

1. A tube-bundle type dedusting and mist removal device, comprising a guide tube, m separators, m≥1, the guide tube is a vertically placed circular tube with a smooth inner wall surface, and the separator includes A plurality of blades with smooth surfaces and a smooth outer central cylinder are arranged up and down perpendicular to the wall of the guide cylinder, and are characterized in that it also includes a cathode tube and a power supply, and at the same time, the upper part of the inner wall of the guide cylinder is set to be electrically connected to the power supply the anode plate, where, The cathode tube is a tubular object with p cathode wires fixed on it, which is arranged on the center line of the diversion tube and vertically passes through the separator, p≥1; The upper part of the cathode tube is the power access section, and the lower part of the cathode tube is the electric field charging section. 2. A tube-bundle dust and mist removal device according to claim 1, characterized in that the material of the upper part of the inner wall of the guide tube is a conductive material. 3. A tube bundle type dedusting and demisting device according to claim 1, characterized in that, the lower part of the guide cylinder is provided with n separators, and the separators are located below the bottom of the cathode tube, n≥0. 4 . The tube-bundle dust and mist removal device according to claim 1 , wherein the height-to-diameter ratio of the guide tube is not less than 6. 5 . 5 . The tube-bundle dust and mist removal device according to claim 1 , wherein the height of the anode plate accounts for 20% to 100% of the total height of the guide tube. 6. A tube-bundle dust and mist removal device according to claim 1, characterized in that, the section of the cathode tube is less than 10% of the section of the guide tube. 7. A tube bundle type dedusting and mist removal device according to claim 1, characterized in that, the power access section of the cathode tube accounts for 1% to 10% of the total length of the cathode tube, and the electric field charging section of the cathode tube The vertical height accounts for 15% to 100% of the height of the guide tube. 8. A tube-bundle dust and mist removal device according to claim 1, wherein the cathode wires of the cathode tubes are arranged in a spiral arrangement of fishbone needles, and the spiral arrangement of fishbone needles is Form, that is, the cathode line fixed on the cathode tube is provided with a fishbone needle-shaped discharge tip of the same material. 9. A tube bundle dust and mist removal device according to claim 1 or 8, characterized in that the surface of the cathode tube is smooth and has a groove, and the cathode wire is wound in the groove of the cathode tube . 10. A tube-bundle dust and mist removal device according to claim 8, characterized in that, the herringbone needle-shaped discharge tips of the plurality of cathode wires are evenly distributed on the cross-section of the cathode tube.