A biomass boiler flue dust capturing device for wet electrostatic precipitators

Abstract

The utility model discloses a biomass boiler smoke dust trapping device for wet electric dust collector, including hollow vertical distribution's cylinder, and the inner chamber of cylinder forms has water collecting chamber, pretreatment chamber and wet dust removal chamber, and the lower part side wall of cylinder is provided with air inlet pipe, and the top of cylinder is provided with air outlet pipe, pretreatment chamber is provided with cyclone atomization shower nozzle located air inlet pipe top, and cyclone atomization shower nozzle is connected with water circulating device between water collecting chamber, wet dust removal chamber is provided with smoke dust collection module, and smoke dust collection module is composed of dust collecting electrode and discharge electrode, and dust collecting electrode has a plurality of vertical through distribution's gas guide channel, and discharge electrode is connected with the cathode wire of the gas guide channel of inlaying. The utility model discloses through the water mist spray treatment before adsorbing and collecting dust first, removes the large particle dust and partial moisture in flue gas in advance, reduces the temperature and the ascending speed of flue gas simultaneously, and makes flue gas can evenly dispersed ascending, can more efficient and completely trap the dust in flue gas.

Description

Technical Field

[0001] This utility model relates to the field of biomass boiler exhaust gas treatment technology, and in particular to a biomass boiler flue gas collection device for a wet electrostatic precipitator. Background Technology

[0002] A wet electrostatic precipitator is a new type of dust removal equipment used to treat dust and particulate matter containing trace amounts of dust. It is mainly used to remove dust, acid mist, water droplet aerosols, odors and other harmful substances from humid gases, making it an ideal device for controlling atmospheric dust pollution. Wet electrostatic precipitators have a strong adaptability to dust and can achieve high dust removal efficiency. They are also suitable for treating high-temperature and high-humidity flue gas without secondary dust generation.

[0003] The existing structure of wet electrostatic precipitators (WEEPs) can be referenced in CN207521157U. When treating flue gas emitted from biomass boilers, the flue gas is typically fed directly into the lower part of the WEEP. Fixed dust collection plates or pipes serve as collecting electrodes, adsorbing and collecting dust particles charged by corona discharge. The purified flue gas is then discharged from the top of the WEEP. However, due to the high temperature of the incoming flue gas, its free-rising velocity is rapid without pretreatment, resulting in insufficient dust collection and low efficiency.

[0004] Therefore, it is of great significance to design a wet electrostatic precipitator for biomass boiler flue gas collection that features uniform flue gas distribution, pre-treatment of flue gas, and efficient dust collection. Utility Model Content

[0005] The purpose of this invention is to provide a biomass boiler flue gas dust collection device for a wet electrostatic precipitator. By subjecting the flue gas to water mist spraying before adsorbing and collecting the dust, large dust particles and some moisture in the flue gas are removed in advance. At the same time, the temperature and rising speed of the flue gas are reduced, and the flue gas can be evenly dispersed and rise as it passes through the cone-shaped water mist. This effectively solves the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A biomass boiler flue gas dust collection device for a wet electrostatic precipitator includes a hollow, vertically distributed cylinder. The inner cavity of the cylinder contains a water collection chamber, a pretreatment chamber, and a wet dust collection chamber arranged sequentially from bottom to top. An air inlet pipe communicating with the pretreatment chamber is provided on the lower side wall of the cylinder, and an air outlet pipe communicating with the wet dust collection chamber is provided on the top of the cylinder. The pretreatment chamber is equipped with a swirling atomizing nozzle for forming a downward-facing cone-shaped water mist. The swirling atomizing nozzle is located above the air inlet pipe, and a circulating water supply device connects the swirling atomizing nozzle to the water collection chamber. The wet dust collection chamber is equipped with a flue gas collection module, which consists of a dust collecting electrode and a discharge electrode. The dust collecting electrode has multiple vertically distributed air guiding channels, and the discharge electrode is connected to a cathode wire extending into the air guiding channels.

[0008] Furthermore, the swirling atomizing nozzle is located on the central axis of the cylinder.

[0009] Furthermore, the circulating water supply device includes a water outlet communicating with the water collection chamber, a circulating pipe connected to the water outlet, and a circulating pump and a circulating valve installed on the circulating pipe. The end of the circulating pipe away from the water outlet is connected to the swirl atomizing nozzle.

[0010] Furthermore, a filter screen covering the water outlet is installed on the inner wall of the water collection chamber.

[0011] Furthermore, a drain pipe communicating with the water collection chamber is provided at the bottom of the cylinder, and a drain valve is installed on the drain pipe.

[0012] Furthermore, the water collection chamber is in the shape of an inverted cone.

[0013] Furthermore, the wet dust removal chamber is equipped with a spray pipe located above the dust collection module. The pipe wall of the spray pipe is provided with several water spray nozzles that spray and flush towards the air guide channel. The spray pipe is connected to a water supply pipe for introducing spray water.

[0014] Furthermore, an airflow distribution plate is provided between the pretreatment chamber and the wet dust removal chamber, and the airflow distribution plate has evenly distributed ventilation holes.

[0015] Furthermore, the airflow distribution plate is horizontally distributed.

[0016] Furthermore, the upper part of the cylinder is provided with a return air pipe that communicates with the wet dust removal chamber. The return air pipe is located above the dust collection module. The lower part of the cylinder is provided with an air inlet pipe that communicates with the pretreatment chamber. A return air duct is connected between the return air pipe and the air inlet pipe. A return air valve and a blower are installed in the return air duct.

[0017] Compared with the prior art, this utility model provides a biomass boiler flue gas dust collection device for wet electrostatic precipitators, which has the following beneficial effects:

[0018] This invention features a swirling atomizing nozzle positioned below the flue gas collection module. This nozzle forms a downward-facing cone-shaped water mist to spray the incoming flue gas, removing large dust particles and some moisture in advance. Simultaneously, it reduces the flue gas temperature and rising speed, allowing the flue gas to disperse and rise evenly as it passes through the cone-shaped water mist. This results in more efficient and thorough dust collection, significantly improving the flue gas collection effect. Attached Figure Description

[0019] 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.

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the cross-sectional structure of the dust collection module.

[0022] Reference numerals: 1. Cylinder; 11. Water collection chamber; 12. Pretreatment chamber; 13. Wet dust removal chamber; 14. Air inlet pipe; 15. Air outlet pipe; 16. Sewage pipe; 161. Sewage valve; 17. Return air pipe; 18. Air inlet pipe; 2. Swirl atomizing nozzle; 3. Circulating water supply device; 31. Water outlet; 32. Circulating pipe; 33. Circulating pump; 34. Circulating valve; 4. Dust collection module; 41. Dust collecting electrode; 411. Air guide channel; 42. Discharge electrode; 421. Cathode wire; 5. Filter screen; 6. Spray pipe; 61. Spray nozzle; 7. Water supply pipe; 8. Airflow distribution plate; 9. Return air pipe; 91. Return air valve; 92. Blower. Detailed Implementation

[0023] The technical solution of this utility model will be clearly and completely described below through detailed embodiments and in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0024] Please refer to Figure 1 and Figure 2This embodiment provides a biomass boiler flue gas dust collection device for a wet electrostatic precipitator, including a hollow, vertically distributed cylinder 1. The inner cavity of the cylinder 1 contains a water collection chamber 11, a pretreatment chamber 12, and a wet dust collection chamber 13, arranged sequentially from bottom to top. An air inlet pipe 14 communicating with the pretreatment chamber 12 is provided on the lower side wall of the cylinder 1, and an air outlet pipe 15 communicating with the wet dust collection chamber 13 is provided on the top of the cylinder 1. The pretreatment chamber 12 is provided with a downward-facing... A swirling atomizing nozzle 2, shaped like a cone of water mist, is located above the air inlet pipe 14. A circulating water supply device 3 connects the swirling atomizing nozzle 2 to the water collection chamber 11. The wet dust removal chamber 13 is equipped with a dust collection module 4, which consists of a dust collecting electrode 41 and a discharge electrode 42. The dust collecting electrode 41 has multiple vertically distributed air guiding channels 411, and the discharge electrode 42 is connected to a cathode wire 421 extending into the air guiding channels 411. Thus, by setting the swirling atomizing nozzle below the dust collection module, a cone-shaped water mist can be formed downwards to spray the incoming flue gas, removing large dust particles and some moisture from the flue gas in advance. This also reduces the temperature and rising speed of the flue gas, allowing it to disperse and rise evenly as it passes through the cone-shaped water mist. This results in more efficient and thorough dust collection, significantly improving the dust collection effect.

[0025] In some specific implementation methods, refer to Figure 1 The circulating water supply device 3 includes a water outlet 31 connected to the water collection chamber 11, a circulation pipe 32 connected to the water outlet 31, and a circulation pump 33 and a circulation valve 34 installed on the circulation pipe 32. The end of the circulation pipe 32 away from the water outlet 31 is connected to the swirl atomizing nozzle 2. By turning on the circulation pump and circulation valve, the water in the water collection chamber can be pumped to the swirl atomizing nozzle, thereby achieving continuous spraying of water mist to pre-treat the incoming flue gas.

[0026] As an improved implementation method, refer to Figure 1 The inner wall of the water collection chamber 11 is equipped with a filter screen 5 that covers the water outlet 31. In this way, the circulating water can be filtered to separate dust particles and prevent clogging of the vortex atomizing nozzle.

[0027] As a preferred embodiment, refer to Figure 1 The swirl atomizing nozzle 2 is located on the central axis of the cylinder 1. In this way, the water mist sprayed by the swirl atomizing nozzle is in the shape of a 360-degree cone, which completely covers the pretreatment chamber, ensuring that the incoming flue gas can be fully sprayed and treated by the water mist.

[0028] In some implementations, reference Figure 1The wet dust collection chamber 13 is equipped with a spray pipe 6 located above the dust collection module 4. The spray pipe 6 has several spray nozzles 61 on its wall, spraying water towards the air guide channel 411. The spray pipe 6 is connected to a water supply pipe 7 for introducing spray water. Thus, water can be periodically introduced through the water supply pipe to rinse the dust adsorbed on the dust collection module, maintaining its efficient dust collection effect. More specifically, clean water is introduced into the water supply pipe. For example, process water formed by re-filtering water discharged from the water collection chamber can be re-introduced into the water supply pipe using a water pump, thereby improving water resource utilization.

[0029] In some implementations, reference Figure 1 The bottom of the cylinder 1 is provided with a drain pipe 16 that communicates with the water collection chamber 12, and the drain pipe 16 is equipped with a drain valve 161. In this way, the water in the water collection chamber can be drained periodically and clean water can be replenished through the water supply pipe.

[0030] As a preferred embodiment, refer to Figure 1 The water collection chamber 11 is in the shape of an inverted cone, which facilitates the drainage of water from the water collection chamber.

[0031] As an improved implementation method, refer to Figure 1 An airflow distribution plate 8 is provided between the pretreatment chamber 12 and the wet dust collection chamber 13. The airflow distribution plate 8 has evenly distributed ventilation holes. In this way, the rising flue gas can be evenly distributed, improving the collection efficiency. As a preferred embodiment, the airflow distribution plate 8 is horizontally distributed.

[0032] In some implementations, reference Figure 1 The upper part of the cylindrical body 1 is provided with a return air pipe 17 communicating with the wet dust removal chamber 13. The return air pipe 17 is located above the dust collection module 4. The lower part of the cylindrical body 1 is provided with an air inlet pipe 18 communicating with the pretreatment chamber 12. A return air duct 9 is connected between the return air pipe 17 and the air inlet pipe 18. The return air duct 9 is equipped with a return air valve 91 and a blower 92. In this way, the return air valve and the blower can be activated after the dust collection module has been sprayed and rinsed, thereby using circulating air to accelerate the drying of the dust collection module and the airflow distribution plate.

[0033] refer to Figure 1 and Figure 2During operation, the high-temperature flue gas discharged from the biomass boiler is input through the inlet pipe 14 at the bottom of the cylinder 1. The flue gas is treated by downward-distributed cone-shaped water mist formed by the swirl atomizing nozzle 2 in the pretreatment chamber 12, which removes large dust particles and some moisture from the flue gas in advance, while reducing the temperature and rising speed of the flue gas, and allowing the flue gas to be evenly dispersed and rise as it passes through the cone-shaped water mist. After that, the pretreated flue gas passes through the airflow distribution plate 8, which can evenly distribute the airflow of the rising flue gas. Then, the flue gas enters the wet dust removal chamber 13. The air guide channel 411 between the cathode wire 421 and the dust collecting electrode 41 forms an electrostatic field, which can charge the dust in the flue gas passing through the air guide channel 411 and adsorb it onto the dust collecting electrode 41. Finally, the clean flue gas is discharged from the outlet pipe 15 at the top of the cylinder 1.

[0034] After a certain period of dust collection and treatment, water is introduced through the water supply pipe 7 to flush the dust adsorbed on the dust collection module 4, so as to maintain its efficient dust collection effect. After flushing, the sewage containing a large amount of dust falls into the water collection chamber 11 and is emptied by opening the drain valve 161. Then, an appropriate amount of water is introduced into the water collection chamber 11 again through the water supply pipe 7 to maintain the circulating water mist spraying treatment in the pretreatment chamber 12. After the water replenishment is completed, the return air valve 91 and the blower 92 are started to use circulating air to accelerate the drying of the dust collection module 4 and the airflow distribution plate 8, so as to restore the optimal dust collection state.

[0035] The above embodiments are merely illustrative of the concept and technical solution of this utility model, and are not intended to limit this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

[0036] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A biomass boiler flue gas dust collection device for a wet electrostatic precipitator, comprising a hollow, vertically distributed cylinder, characterized in that, The inner cavity of the cylinder contains a water collection chamber, a pretreatment chamber, and a wet dust removal chamber arranged sequentially from bottom to top. An air inlet pipe communicating with the pretreatment chamber is located on the lower side wall of the cylinder, and an air outlet pipe communicating with the wet dust removal chamber is located on the top of the cylinder. The pretreatment chamber is equipped with a swirling atomizing nozzle for forming a downward-facing cone-shaped water mist. The swirling atomizing nozzle is located above the air inlet pipe, and a circulating water supply device connects the swirling atomizing nozzle to the water collection chamber. The wet dust removal chamber is equipped with a dust collection module, which consists of a dust collecting electrode and a discharge electrode. The dust collecting electrode has multiple vertically distributed air guiding channels, and the discharge electrode is connected to a cathode wire extending into the air guiding channels.

2. The biomass boiler flue gas dust collection device for wet electrostatic precipitators according to claim 1, characterized in that, The swirling atomizing nozzle is located on the central axis of the cylinder.

3. The biomass boiler flue gas dust collection device for wet electrostatic precipitators according to claim 1, characterized in that, The circulating water supply device includes an outlet connected to the water collection chamber, a circulating pipe connected to the outlet, and a circulating pump and a circulating valve installed on the circulating pipe. The end of the circulating pipe away from the outlet is connected to the swirl atomizing nozzle.

4. The biomass boiler flue gas dust collection device for wet electrostatic precipitators according to claim 3, characterized in that, The inner wall of the water collection chamber is fitted with a filter screen covering the water outlet.

5. The biomass boiler flue gas dust collection device for wet electrostatic precipitators according to claim 1, characterized in that, The bottom of the cylinder is provided with a drain pipe that communicates with the water collection chamber, and the drain pipe is equipped with a drain valve.

6. The biomass boiler flue gas dust collection device for wet electrostatic precipitators according to claim 5, characterized in that, The water collection chambers are in the shape of an inverted cone.

7. The biomass boiler flue gas dust collection device for wet electrostatic precipitators according to claim 1, characterized in that, The wet dust removal chamber is equipped with a spray pipe located above the dust collection module. The pipe wall of the spray pipe is provided with several water spray nozzles that spray and flush towards the air guide channel. The spray pipe is connected to a water supply pipe for introducing spray water.

8. The biomass boiler flue gas dust collection device for wet electrostatic precipitators according to claim 1, characterized in that, An airflow distribution plate is provided between the pretreatment chamber and the wet dust removal chamber, and the airflow distribution plate has evenly distributed ventilation holes.

9. The biomass boiler flue gas dust collection device for wet electrostatic precipitators according to claim 8, characterized in that, The airflow distribution plates are horizontally distributed.

10. The biomass boiler flue gas dust collection device for a wet electrostatic precipitator according to any one of claims 1 to 9, characterized in that, The upper part of the cylinder is provided with a return air pipe that communicates with the wet dust removal chamber. The return air pipe is located above the dust collection module. The lower part of the cylinder is provided with an air inlet pipe that communicates with the pretreatment chamber. A return air duct is connected between the return air pipe and the air inlet pipe. The return air duct is equipped with a return air valve and a blower.

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