Chimney white dust removal system

Abstract

The invention discloses a chimney whitening and dust removal system, comprising at least one stage of ionization device fixedly arranged on the top of the chimney and distributed along the axial direction of the chimney, each stage of the ionization device comprises a plurality of groups of coaxially arranged ionization components, each group of ionization components comprises a plurality of annularly connected wire electrodes and a cylinder electrode sleeved on the outer periphery of all the wire electrodes to form an ionization electrostatic field, the ionization electrostatic field ionizes the wet flue gas discharged from the chimney into ionized water vapor and charged dust, the ionized water vapor and the charged dust move radially from the inside to the outside to the cylinder electrode under the action of the ionization electrostatic field, and the ionized water vapor and the charged dust have a radial temperature gradient from the inside to the outside, the temperature of the ionized water vapor and the charged dust shows a gradual decreasing trend in the process of moving radially from the inside to the outside, the two are condensed on the cylinder electrode to form mixed liquid beads under the superposition of the ionization electrostatic field and the radial temperature gradient, the mixed liquid beads carrying dust reflux along the cylinder electrode to achieve demisting and dust removal, the process is relatively simple, and the whitening effect is good.

Description

Technical Field

[0001] The invention relates to the technical field of industrial environmental protection, and in particular to a chimney whitening and dust removal system. Background Art

[0002] After wet desulfurization, gas boilers and water spraying, coal-fired machines produce saturated or nearly saturated wet flue gas, which usually carries a certain amount of particulate matter, such as dust particles, desulfurization slurry, condensable particulate matter and soluble solid particles. After the wet flue gas is discharged into the atmosphere, it mixes with the air at a lower temperature and condenses to form droplets, i.e., chimney white smoke. Affected by the wet flue gas, the white smoke has a high moisture content, and the particulate matter it carries promotes the formation of haze, posing a serious threat to the environment. Therefore, it is particularly necessary to defog and whiten the chimney.

[0003] Based on the formation mechanism of white smoke, existing chimney demisting and whitening technologies mainly use thermal processes, such as flue gas heating or condensation technology. Flue gas heating technology heats the flue gas that is about to be discharged from the chimney to achieve chimney whitening by increasing the saturated vapor pressure, while condensation technology uses heat exchange equipment to cool and condense the saturated wet flue gas in the chimney by inputting cold energy to achieve the purpose of whitening by reducing the moisture content of the flue gas. However, the process of the chimney demisting and whitening technology of the above thermal process is relatively complicated, and the whitening effect is not good. Summary of the invention

[0004] In view of the above, the object of the present invention is to provide a chimney whitening and dust removal system, comprising at least one stage of ionization device, each stage of ionization device comprising a plurality of groups of coaxially arranged ionization components, each group of ionization components comprising a linear electrode and a cylindrical electrode for forming an ionization electrostatic field, the ionization electrostatic field ionizes the wet flue gas discharged from the chimney into ionized water vapor and charged dust, the ionized water vapor and the charged dust are condensed on the cylindrical electrode under the superposition of the ionization electrostatic field and the radial temperature gradient, so as to capture water vapor and dust and achieve dust removal and demisting effects, the process is relatively simple, and the whitening effect is better.

[0005] The specific plan is as follows:

[0006] The chimney white dust removal system provided by the present invention comprises at least one stage of ionization device fixedly mounted on the top of the chimney and distributed along the axial direction of the chimney, each stage of the ionization device comprises a plurality of groups of coaxially arranged ionization components, each group of ionization components comprises a plurality of annularly connected wire electrodes and a cylindrical electrode sleeved on the outer periphery of all the wire electrodes to form an ionization electrostatic field, the ionization electrostatic field is used to ionize the wet flue gas discharged from the chimney into ionized water vapor and charged dust so that the two move radially from the inside to the outside to the cylindrical electrode and at the same time condense dew on the cylindrical electrode by means of a radial temperature gradient from the inside to the outside to achieve capture.

[0007] Preferably, it also includes a high-voltage power supply connected to each stage of the ionization device, and all the line electrodes and all the cylinder electrodes are respectively connected to the high-voltage end and the low-voltage end of the high-voltage power supply.

[0008] Preferably, the side wall of the cylindrical electrode is provided with a penetrating condensation hole, and the condensation hole is used for heat exchange between the ionized water vapor and the charged dust and the outside air so that the two can condense and condense through cooling.

[0009] Preferably, each set of ionization components further includes an insulator for fixing and supporting the wire electrode and the barrel electrode.

[0010] Preferably, the ionization device includes a primary ionization device fixed on the top of the chimney and a secondary ionization device fixed axially on the top of the primary ionization device; the primary ionization electrostatic field of the primary ionization device is used to ionize the wet flue gas discharged from the chimney into ionized water vapor and charged dust so that the two can condense on the primary tube electrode with the help of a radial temperature gradient; the secondary ionization electrostatic field of the secondary ionization device is used to further ionize the wet flue gas that has not been ionized by the primary ionization device into ionized water vapor and charged dust so that the two can again condense on the secondary tube electrode with the help of a radial temperature gradient.

[0011] Preferably, the porosity of the primary tube electrode is greater than the porosity of the secondary tube electrode.

[0012] Preferably, the number of primary ionization components included in the primary ionization device is greater than the number of secondary ionization components included in the secondary ionization device.

[0013] Preferably, both the primary ionization device and the secondary ionization device are cylindrical, the outer diameter of the primary ionization device is greater than or equal to the outer diameter of the chimney, and the outer diameter of the secondary ionization device is greater than or equal to the outer diameter of the primary ionization device.

[0014] Preferably, it also includes a first connecting sleeve fixedly mounted on the chimney to support the primary ionization device and a second connecting sleeve fixedly connected between the primary ionization device and the secondary ionization device.

[0015] Preferably, the primary ionization device is integrally connected to the secondary ionization device.

[0016] Compared with the background technology, the chimney dust removal system provided by the present invention includes at least one stage of ionization device, and each stage of ionization device is distributed along the axial direction of the chimney and fixedly arranged on the top of the chimney. Each stage of the ionization device includes a plurality of groups of coaxially arranged ionization components, each group of ionization components includes a plurality of annularly connected wire electrodes and a cylindrical electrode sleeved on the periphery of all the wire electrodes, each group of wire electrodes and the cylindrical electrode are combined to form an ionization electrostatic field, the ionization electrostatic field ionizes the wet flue gas discharged from the chimney, the wet flue gas is ionized into ionized water vapor and charged dust, the ionized water vapor and the charged dust move radially from the inside to the outside to the cylindrical electrode under the action of the ionization electrostatic field, based on the particularity of the chimney structure, the ionization device itself has a radial temperature gradient from the inside to the outside, that is, the temperature of the ionized water vapor and the charged dust shows a gradual decreasing trend during the radial movement from the inside to the outside, so that the ionized water vapor and the charged dust are condensed into mixed liquid beads on the cylindrical electrode under the superposition of the ionization electrostatic field and the radial temperature gradient, the mixed liquid beads carrying dust flow back to the chimney along the cylindrical electrode under the action of gravity, so that the water vapor and dust are collected at the same time, the process is relatively simple, and the de-whitening effect is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0018] Figure 1 A schematic structural diagram of a chimney dust removal system provided in a first specific embodiment of the present invention;

[0019] Figure 2 for Figure 1 A top view of the middle-stage ionization device;

[0020] Figure 3 for Figure 1 A top view of the secondary ionization device;

[0021] Figure 4 A simplified structural diagram of a chimney white dust removal system provided for the second specific embodiment of the present invention.

[0022] The reference numerals are as follows:

[0023] Chimney 01;

[0024] Ionization device 1, high voltage power supply 2, condensation hole 3, first connecting sleeve 4 and second connecting sleeve 5;

[0025] A primary ionization device 11 and a secondary ionization device 12;

[0026] A primary wire electrode 111 and a primary cylinder electrode 112;

[0027] A secondary wire electrode 121 and a secondary cylindrical electrode 122 . DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0030] Please refer to Figures 1 to 3 , Figure 1 A schematic structural diagram of a chimney dust removal system provided in a first specific embodiment of the present invention; Figure 2 for Figure 1 A top view of the middle-stage ionization device; Figure 3 for Figure 1 Top view of the secondary ionization device.

[0031] The embodiment of the present invention discloses a chimney white dust removal system, which is suitable for purifying a chimney 01 that discharges wet flue gas, wherein the wet flue gas is a mixture of water vapor and dust.

[0032] The present invention includes at least one stage of ionization device, and the number of stages of ionization device 1 is determined by parameters such as the smoke exhaust volume and diameter of chimney 01, which are not specifically limited here. When the present invention includes at least two stages of ionization device 1, each stage of ionization device 1 is distributed along the axial direction of chimney 01, and the ionization device 1 at the bottom is fixedly arranged on the top of chimney 01.

[0033] Each stage of the ionization device 1 includes a plurality of groups of coaxially arranged ionization components. The coaxial arrangement of all the ionization components can make the temperature change direction of the ions coincide with the ionization movement direction, thus providing conditions for ion condensation.

[0034] Each set of ionization components includes a number of ring-shaped connected wire electrodes and a tube electrode sleeved on the outer circumference of all the wire electrodes. The tube electrode is sleeved outside the wire electrode so that the positional relationship between the tube electrode and the wire electrode conforms to the law that the temperature decreases from the inside to the outside along the radial direction of the chimney 01, which helps to achieve rapid condensation.

[0035] Each set of wire electrodes is combined with the cylindrical electrode to form an ionization electrostatic field, which ionizes the wet flue gas discharged from the chimney 01. The wet flue gas is ionized into ionized water vapor and charged dust. The ionized water vapor and charged dust move radially from the inside to the outside to the cylindrical electrode under the action of the ionization electrostatic field. Based on the particularity of the structure of the chimney 01, the ionization device 1 itself has a radial temperature gradient from the inside to the outside, that is, the temperature of the ionized water vapor and the charged dust gradually decreases during the radial movement from the inside to the outside, so that the ionized water vapor and the charged dust are condensed into mixed liquid beads on the cylindrical electrode under the superposition of the ionization electrostatic field and the radial temperature gradient. The mixed liquid beads carrying dust flow back to the chimney 01 along the cylindrical electrode under the action of gravity, so that the water vapor and dust are collected at the same time. The process is relatively simple and the de-whitening effect is better.

[0036] In order to form an ionization electrostatic field, the present invention further includes a high-voltage power supply 2, which is connected to each stage of the ionization device 1. All ionization devices 1 can share a set of high-voltage power supplies 2, and each stage of the ionization device 1 can also use a set of high-voltage power supplies 2 separately. All line electrodes and all cylinder electrodes are respectively connected to the high-voltage end and the low-voltage end of the high-voltage power supply 2, that is, the high-voltage end of the high-voltage power supply 2 is connected to all line electrodes and the low-voltage end is connected to all the cylinder electrodes, so that there is a voltage difference between the line electrodes and the cylinder electrodes of each group of ionization components, thereby forming an ionization electrostatic field for each group of ionization components.

[0037] In this specific embodiment, the high voltage power supply 2 can be a DC power supply, a pulse power supply, or a DC superimposed pulse power supply. To improve the degree of ionization, the high voltage power supply 2 specifically adopts a positive polarity high voltage DC power supply, with an output voltage greater than or equal to 45 kV and an output current density greater than or equal to 0.8 mA / m 2 , the output frequency range is 50~10Hz.

[0038] Taking stability into consideration, each set of ionization components in the present invention further includes an insulator for fixing and supporting the wire electrode and the barrel electrode.

[0039] Specifically, the ionization device 1 in the present invention includes two stages, namely a primary ionization device 11 and a secondary ionization device 12 . The primary ionization device 11 is fixedly mounted on the top of the chimney 01 , and the secondary ionization device 12 is axially fixedly mounted on the top of the primary ionization device 11 .

[0040] The primary ionization device 11 includes several groups of primary ionization components, each group of primary ionization components includes several ring-shaped connected primary wire electrodes 111 and a primary cylindrical electrode 112 sleeved on the outer circumference of all the primary wire electrodes 111. The primary wire electrodes 111 and the primary cylindrical electrodes 112 form a primary ionization electrostatic field, which preliminarily ionizes the wet flue gas discharged from the chimney 01 into ionized water vapor and charged dust. The ionized water vapor and the charged dust condense on the primary cylindrical electrode 112 with the help of the radial temperature gradient, and the mixed liquid beads formed by condensation flow back into the chimney 01 along the primary cylindrical electrode 112, thereby preliminarily achieving demisting and dust removal.

[0041] The secondary ionization device 12 includes several groups of secondary ionization components, each group of secondary ionization components includes several ring-shaped connected secondary wire electrodes 121 and secondary cylindrical electrodes 122 sleeved on the outer circumference of all the secondary wire electrodes 121, the secondary wire electrodes 121 and the secondary cylindrical electrodes 122 form a secondary ionization electrostatic field, the secondary ionization electrostatic field further ionizes the wet flue gas that has not been ionized by the primary ionization device 11 into ionized water vapor and charged dust, the secondary ionization electrostatic field can also further ionize the mixed liquid beads condensed after ionization by the primary ionization device 11 into ionized water vapor and charged dust, the ionized water vapor and the charged dust condense on the secondary cylindrical electrode 122 with the help of radial temperature gradient, the condensed mixed liquid beads flow back to the chimney 01 along the secondary cylindrical electrode 122, and the demisting and dust removal are realized again.

[0042] In this specific embodiment, a plurality of primary wire electrodes 111 and a plurality of secondary wire electrodes 121 are distributed in a circular ring shape, and two adjacent primary wire electrodes 111 or two adjacent secondary wire electrodes 121 are connected by wires. The primary wire electrodes 111 and the secondary wire electrodes 121 can be metal rods. The primary cylinder electrode 112 and the secondary cylinder electrode 122 are both cylindrical, and the primary cylinder electrode 112 and the secondary cylinder electrode 122 can be metal wire mesh, porous plate or foam metal, etc., which are not specifically limited here.

[0043] Taking the manufacturing cost into consideration, in this specific embodiment, the primary ionization device 11 and the secondary ionization device 12 share a set of high-voltage power supply 2, all the primary wire electrodes 111 are connected to the high-voltage end of the high-voltage power supply 2, and all the primary cylinder electrodes 112 are connected to the low-voltage end of the high-voltage power supply 2, that is, each group of primary wire electrodes 111 and primary cylinder electrodes 112 are respectively connected to the high-voltage end and the low-voltage end of the high-voltage power supply 2, providing conditions for the radial movement of ionized water vapor and charged dust along the chimney 01. Similarly, each group of secondary wire electrodes 121 and secondary cylinder electrodes 122 are respectively connected to the high-voltage end and the low-voltage end of the high-voltage power supply 2. It should also be added that using the high-voltage power supply 2 to supply power to the primary ionization device 11 and the secondary ionization device 12 is conducive to extending the stable operation period of the chimney whitening and dust removal system, and has low operating power consumption and high safety.

[0044] In order to achieve rapid condensation, the side wall of the cylindrical electrode is provided with a penetrating condensation hole 3, so that the ionized water vapor and charged dust attached to the inner wall of the cylindrical electrode can exchange heat with the outside air through the condensation hole 3, accelerate the reduction of the temperature of the ionized water vapor and charged dust, and accelerate the condensation of the ionized water vapor and charged dust. In addition, the setting of the condensation hole 3 can also reduce the weight of the cylindrical electrode, making it lighter and easier to assemble and construct. The condensation hole 3 is specifically a circular through hole, but is not limited to this.

[0045] In this specific embodiment, the side walls of the primary cylindrical electrode 112 and the side walls of the secondary cylindrical electrode 122 are both provided with penetrating condensation holes 3 , and the condensation holes 3 are specifically circular through holes, but are not limited thereto.

[0046] In order to take into account both the manufacturing cost and the condensation effect, the positional relationship between the primary ionization device 11 and the secondary ionization device 12 determines that the volume of wet flue gas to be ionized by the primary ionization device 11 is higher than that of the secondary ionization device 12. This requires that the porosity of the primary cylindrical electrode 112 is greater than that of the secondary cylindrical electrode 122, that is, the number of condensation holes 3 opened on the primary cylindrical electrode 112 is greater than the number of condensation holes 3 opened on the secondary cylindrical electrode 122, so that the electronic state water vapor ionized by the primary cylindrical electrode 112 is greater than that of the secondary cylindrical electrode 122, which complies with the law of reducing the moisture content of wet flue gas, thereby effectively reducing the manufacturing cost while ensuring the condensation effect.

[0047] In this specific embodiment, the porosity of the primary cylindrical electrode 112 is greater than or equal to 50%, and the porosity of all primary cylindrical electrodes 112 increases from the inside to the outside along the radial direction of the chimney 01. The porosity range of the primary cylindrical electrode 112 is preferably 50% to 70%, which is conducive to the rapid diffusion and condensation of ionized water vapor and charged dust. Correspondingly, the porosity of the secondary cylindrical electrode 122 is less than or equal to 50%, and the porosity range of the secondary cylindrical electrode 122 is preferably 20% to 50%. Of course, the porosity of the primary cylindrical electrode 112 and the porosity of the secondary cylindrical electrode 122 are specifically set according to actual working conditions and are not limited thereto.

[0048] Furthermore, based on the positional relationship between the primary ionization device 11 and the secondary ionization device 12, the number of primary ionization components included in the primary ionization device 11 is greater than the number of secondary ionization components included in the secondary ionization device 12, so that the volume of wet flue gas ionized by the primary ionization device 11 is greater than that of the secondary ionization device 12, which can also effectively reduce the manufacturing cost while ensuring the condensation effect.

[0049] In the first specific embodiment, the primary ionization device 11 and the secondary ionization device 12 are connected in a split type. Accordingly, the present invention also includes a first connecting sleeve 4 and a second connecting sleeve 5, wherein the first connecting sleeve 4 is fixedly arranged at the top of the chimney 01, and the first connecting sleeve 4 is provided with a supporting groove, and the primary ionization device 11 is installed in the supporting groove, so that the first connecting sleeve 4 can support the primary ionization device 11. The second connecting sleeve 5 is fixedly connected between the primary ionization device 11 and the secondary ionization device 12, so that the second connecting sleeve 5 supports the secondary ionization device 12. The first connecting sleeve 4 and the primary ionization device 11, the second connecting sleeve 5 and the primary ionization device 11, and the second connecting sleeve 5 and the secondary ionization device 12 can be fixedly connected by interference connection, or by threaded connection, which is not specifically limited here.

[0050] Considering that the chimney 01 is usually cylindrical, in this specific embodiment, the primary ionization device 11 and the secondary ionization device 12 are both cylindrical. Of course, the structures of the primary ionization device 11 and the secondary ionization device 12 are specifically set according to the structure of the chimney 01. The outer diameter of the primary ionization device 11 is greater than or equal to the outer diameter of the chimney 01, so that the primary ionization device 11 can fully ionize the wet flue gas discharged from the chimney 01. In addition, the outer diameter of the secondary ionization device 12 is greater than or equal to the outer diameter of the primary ionization device 11, ensuring that the secondary ionization device 12 can fully ionize the liquid water vapor ionized by the primary ionization device 11.

[0051] Please refer to Figure 4 , Figure 4 A simplified structural diagram of a chimney white dust removal system provided for the second specific embodiment of the present invention.

[0052] Compared with the first specific embodiment, the key of the second specific embodiment is to change the connection mode of the multi-stage ionization device 1, that is, the connection mode of the primary ionization device 11 and the secondary ionization device 12, and other schemes remain unchanged. Different from the split connection mode of the first specific embodiment, in the second specific embodiment, the primary ionization device 11 and the secondary ionization device 12 are connected in one piece.

[0053] The chimney white dust removal system provided by the present invention is introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; at the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A chimney dust removal system, characterized in that: The invention comprises at least one stage of ionization device (1) fixedly mounted on the top of a chimney (01) and distributed along the axial direction of the chimney (01), wherein each stage of the ionization device (1) comprises a plurality of groups of coaxially arranged ionization components, wherein each group of the ionization components comprises a plurality of annularly connected wire electrodes and a cylindrical electrode sleeved on the outer circumference of all the wire electrodes to form an ionization electrostatic field, wherein the ionization electrostatic field is used to ionize wet flue gas discharged from the chimney (01) into ionized water vapor and charged dust so that the two move radially from the inside to the outside to the cylindrical electrode and simultaneously condense dew on the cylindrical electrode by means of a radial temperature gradient from the inside to the outside to achieve capture; The side wall of the cylindrical electrode is provided with a penetrating condensation hole (3), and the condensation hole (3) is used for simultaneously allowing ionized water vapor and charged dust to exchange heat with the outside air so that the two can condense and condense through cooling; each group of the ionization components also includes an insulator for fixing and supporting the wire electrode and the cylindrical electrode.

2. The chimney dust removal system according to claim 1, characterized in that: It also includes a high-voltage power supply (2) connected to each stage of the ionization device (1), and all of the wire electrodes and all of the cylinder electrodes are respectively connected to the high-voltage end and the low-voltage end of the high-voltage power supply (2).

3. The chimney dust removal system according to any one of claims 1 to 2, characterized in that: The ionization device (1) comprises a primary ionization device (11) fixedly mounted on the top of a chimney (01) and a secondary ionization device (12) fixedly mounted on the top of the primary ionization device (11) along the axial direction; the primary ionization electrostatic field of the primary ionization device (11) is used to ionize wet flue gas discharged from the chimney (01) into ionized water vapor and charged dust, so that the two are condensed on a primary cylindrical electrode (112) by means of a radial temperature gradient; the secondary ionization electrostatic field of the secondary ionization device (12) is used to further ionize wet flue gas that has not been ionized by the primary ionization device (11) into ionized water vapor and charged dust, so that the two are condensed on a secondary cylindrical electrode (122) again by means of a radial temperature gradient.

4. The chimney dust removal system according to claim 3, characterized in that: The opening rate of the primary cylindrical electrode (112) is greater than the opening rate of the secondary cylindrical electrode (122).

5. The chimney dust removal system according to claim 3, characterized in that: The number of primary ionization components included in the primary ionization device (11) is greater than the number of secondary ionization components included in the secondary ionization device (12).

6. The chimney dust removal system according to claim 3, characterized in that: The primary ionization device (11) and the secondary ionization device (12) are both cylindrical, the outer diameter of the primary ionization device (11) is greater than or equal to the outer diameter of the chimney (01), and the outer diameter of the secondary ionization device (12) is greater than or equal to the outer diameter of the primary ionization device (11).

7. The chimney dust removal system according to claim 3, characterized in that: It also includes a first connecting sleeve (4) fixedly mounted on the chimney (01) to support the primary ionization device (11), and a second connecting sleeve (5) fixedly connected between the primary ionization device (11) and the secondary ionization device (12).

8. The chimney dust removal system according to claim 3, characterized in that: The primary ionization device (11) and the secondary ionization device (12) are connected in one piece.

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