Fluidized bed boiler electrostatic dust collection device

Abstract

The utility model belongs to the technical field of fluidized bed boilers, and particularly relates to an electrostatic dust collection device of a fluidized bed boiler, which comprises a dust collection shell, a dust collection cover and a dust collection cover, the interior of the dust removal shell is sequentially divided into a first electric area, a second electric area, a first bag area, a second bag area and a third bag area from the air inlet to the air outlet, the dust removal mechanisms are arranged in the first bag area, the second bag area and the third bag area, each dust removal mechanism comprises a plurality of filter bags, and the filter bags are arranged in the first bag area, the second bag area and the third bag area. The electrostatic dust collector comprises a dust collection shell which is connected with the dust collection shell through a plurality of communicating pipes, a plurality of air bags which are connected with the communicating pipes on the dust collection shell, and an air purification chamber which is arranged on the dust collection shell. And the dust removal effect and the dust removal efficiency are greatly improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of fluidized bed boilers, and particularly relates to an electrostatic dust removal device for a fluidized bed boiler. Background Art

[0002] The circulating fluidized bed boiler adopts the clean coal combustion technology with the highest industrialization degree. The circulating fluidized bed boiler adopts fluidized combustion, and its main structure includes two major parts: a combustion chamber (including a dense phase zone and a dilute phase zone) and a circulating return furnace (including a high-temperature gas-solid separator and a return feeding system).

[0003] During the use of the circulating fluidized bed boiler, each original boiler is equipped with an electrostatic precipitator, which mainly treats the dust in the flue gas during the combustion process of the boiler. The dust removal system processes a single air volume of 517327 m³ / h (operating condition), and the double-chamber five-field electrostatic precipitator is used for the purification of the dust-containing gas. However, the dust concentration of the flue gas treated by this double-chamber five-field electrostatic precipitator is ≤30 mg / Nm³, which cannot better meet the requirements of the current emission standards, and the dust removal effect for relatively fine particulate dust is not good.

[0004] Therefore, the utility model provides an electrostatic dust removal device for a fluidized bed boiler. Summary of the Utility Model

[0005] The purpose of the utility model is to solve the problem that the existing electrostatic dust removal cannot adsorb and remove relatively fine particulate dust, and realizes the adsorption and removal of fine particulate dust, greatly improving the dust removal effect and efficiency.

[0006] To achieve the above purpose, the utility model adopts the following technical scheme: an electrostatic dust removal device for a fluidized bed boiler, comprising: a dust removal outer shell, one end of the dust removal outer shell is provided with an air inlet, and the other end is provided with an air outlet; the interior of the dust removal outer shell is sequentially divided into a first electric area, a second electric area, a first bag area, a second bag area and a third bag area from the air inlet to the air outlet, and further comprises:

[0007] A plurality of dust removal mechanisms are respectively arranged in the first bag area, the second bag area and the third bag area for further adsorbing and removing fine particulate dust in the flue gas; the dust removal mechanism comprises:

[0008] A plurality of filter bags are connected to the dust removal outer shell through a plurality of connecting pipes for adsorbing fine particulate dust in the flue gas;

[0009] A plurality of air bags are connected to the connecting pipes on the dust removal outer shell, and the filter bags are inflated through the connecting pipes to make the particulate dust on the outer surface of the filter bags fall off;

[0010] The clean gas chamber is arranged in the dust removal housing, communicates with the ends of the first bag area, the second bag area and the third bag area and is connected to the air outlet, and is used for collecting the treated tail gas and introducing it to the other end of the dust removal housing for discharging from the air outlet.

[0011] Preferably, a plurality of electrode plates and a plurality of electrode wires are respectively arranged on the first electric area and the second electric area of the dust removal housing, the plurality of electrode plates and the plurality of electrode wires are arranged at intervals, and vibration motors are arranged on the electrode plates.

[0012] Preferably, the first electric area is a high-voltage electric area and the second electric area is a low-voltage electric area.

[0013] Preferably, the plurality of filter bags are respectively arranged vertically in a rectangular array, the tops of the plurality of filter bags are communicated with the communicating pipe, and the bottoms are free ends.

[0014] Preferably, the filter bag is of a cylindrical structure and can expand radially.

[0015] Preferably, the length of the filter bag is 2 / 3 of the height of the dust removal housing.

[0016] Preferably, a dust hopper is arranged at the bottom of the dust removal housing, and the dust hopper is communicated with the dust removal housing for collecting the falling dust particles.

[0017] Preferably, the air outlet is communicated with the clean gas chamber through a trachea, and the air outlet is not communicated with the internal space of the dust removal housing.

[0018] Preferably, an air pump is connected to the air bag.

[0019] Advantages of the present utility model:

[0020] 1. By providing a dust removal mechanism on the dust removal housing, the present utility model can thoroughly remove the fine dust in the flue gas and collect the removed fine dust particles, greatly improving the dust removal efficiency and at the same time greatly reducing the soot emission.

[0021] 2. By providing filter bags on the dust removal mechanism, the present utility model adsorbs the relatively fine particles of the flue gas through the plurality of filter bags, thereby reducing the dust content in the flue gas, and fills the air into the interior of the filter bags through an air pump to expand the filter bags, so that the fine particles attached to the surface of the filter bags fall off, thereby cleaning the filter bags, and reducing the original flue gas dust concentration from ≤30 mg / Nm3 to ≤10 mg / Nm3, greatly improving the dust removal efficiency and reducing the soot emission.

[0022] 3. In the present utility model, electrodes and electrode wires are provided in the first electric area and the second electric area of the dust removal housing. By energizing the electrodes and electrode wires to generate positive and negative ions, large particulate dust in the flue gas is adsorbed, thereby removing most of the dust particles, reducing the load on the filter bag, and extending the service life of the filter bag. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a three-dimensional structure schematic diagram of the whole present utility model.

[0024] Figure 2 It is a three-dimensional structure schematic diagram of the present utility model without a clean gas chamber.

[0025] Figure 3 It is a three-dimensional structure schematic diagram of the dust removal housing of the present utility model without a top cover.

[0026] Figure 4 It is a three-dimensional structure schematic diagram of the interior of the dust removal housing of the present utility model.

[0027] In the figure: 1. Dust removal housing; 11. First electric area; 12. Second electric area; 13. First bag area; 14. Second bag area; 15. Third bag area; 16. Electrode; 17. Electrode wire; 18. Ash hopper; 19. Air pipe; 2. Air inlet; 3. Air outlet; 4. Dust removal mechanism; 41. Filter bag; 42. Air bag; 43. Clean gas chamber; 5. Connecting pipe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The following further describes the usage method of the present utility model in conjunction with the drawings and specific embodiments.

[0029] As Figures 1 to 4 shown, a fluidized bed boiler electrostatic dust removal device includes: a dust removal housing 1, with an air inlet 2 provided at one end and an air outlet 3 provided at the other end; the interior of the dust removal housing 1 is sequentially divided into a first electric area 11, a second electric area 12, a first bag area 13, a second bag area 14, and a third bag area 15 from the air inlet 2 to the air outlet 3, and further includes:

[0030] A plurality of dust removal mechanisms 4, respectively arranged in the first bag area 13, the second bag area 14, and the third bag area 15, for further adsorbing and removing fine particulate dust in the flue gas; the dust removal mechanism 4 includes:

[0031] A plurality of filter bags 41, connected to the dust removal housing 1 through a plurality of connecting pipes 5, for adsorbing fine particulate dust in the flue gas;

[0032] A plurality of air bags 42, connected to the connecting pipes 5 on the dust removal housing 1, and inflating the filter bags 41 through the connecting pipes 5 to make them expand, so that the particulate dust on the outer surface of the filter bags 41 falls off;

[0033] The clean gas chamber 43 is provided in the dust removal housing 1, communicates with the ends of the first bag area 13, the second bag area 14 and the third bag area 15 and is connected to the air outlet 3, and is used for collecting the treated tail gas and introducing it to the other end of the dust removal housing 1, and discharging it from the air outlet 3.

[0034] By combining the first electric area 11, the second electric area 12, the first bag area 13, the second bag area 14 and the third bag area 15, most of the soot particles are removed before reaching the filter bag 41, significantly reducing the load on the filter bag 41 and extending the service life of the filter bag 41; the electric area and the bag area are installed in the same housing, and the flue gas channels are connected; it meets the requirements of ultra-low flue gas emissions, ensures the continuous operation of the boiler device, reduces the environmental protection pressure, greatly improves the dust removal efficiency, and reduces the soot emissions.

[0035] And 90% of the soot particles are removed before reaching the filter bag 41, significantly reducing the load on the filter bag 41 and extending the service life of the filter bag 41.

[0036] Without changing the size, it improves the flue gas treatment accuracy and the efficiency of a single dust removal device: the outlet of the electrostatic precipitator is 30mg / Nm3, and the current outlet of the electric bag precipitator is 10mg / Nm3, and the dust removal efficiency is increased by 67%, greatly reducing the soot emissions.

[0037] On the dust removal housing 1, a plurality of electrode plates 16 and a plurality of electrode wires 17 are respectively provided in the first electric area 11 and the second electric area 12. The plurality of electrode plates 16 and the plurality of electrode wires 17 are arranged at intervals, and a vibration motor is provided on the electrode plate 16. The vibration motor is used to generate vibration and shake off the particulate dust attached to the electrode plate 16, so as to fall into the ash hopper 18 for collection.

[0038] The first electric area 11 is a high-voltage area, and the second electric area 12 is a low-voltage area. The high-voltage area first adsorbs and removes the large particulate dust, and then the flue gas enters the low-voltage area for dust removal.

[0039] It should be noted that if the first bag area 13, the second bag area 14 and the third bag area 15 are all electrostatic precipitators, then the annual power consumption of the electrostatic precipitator in the first bag area 13, the second bag area 14 and the third bag area 15 is: 252 * 8000 * 3 = 6048000 KWh. After adopting the electric bag precipitator, the power consumption is greatly reduced and the energy is saved.

[0040] The plurality of filter bags 41 are respectively arranged vertically in a rectangular array, and the tops of the plurality of filter bags 41 are connected to the connecting pipe 5, and the bottoms are free ends.

[0041] The filter bag 41 is of a cylindrical structure and can expand radially. This is to be able to remove the particulate dust on the filter bag 41, so as to maintain the dust removal efficiency of the filter bag 41.

[0042] The length of the filter bag 41 is 2 / 3 of the height of the dust removal housing 1. This is to improve the dust removal effect of the filter bag 41, increase the contact area between the flue gas and the filter bag 41, and thus improve the dust removal efficiency.

[0043] The pre-stage electrostatic area removes 80 - 90% of the dust in the flue gas. The remaining dust is collected by the post-stage bag area. The dust passing through the electrostatic dust removal area is charged by the electric field, and the charged dust is captured by the bag. The captured dust is regularly and loosely arranged on the surface of the bag. Therefore, the resistance of the bag dust removal area is lower than that of the conventional pure bag dust removal area, and it is easier to clean the ash, with high flue gas treatment accuracy and the efficiency of a single dust removal device, meeting the requirements of ultra-low flue gas emissions, ensuring the continuous operation of the boiler device, and reducing the environmental protection pressure.

[0044] A hopper 18 is provided at the bottom of the dust removal housing 1, and the hopper 18 is communicated with the dust removal housing 1 for collecting the falling dust particles.

[0045] The air outlet 3 is communicated with the clean gas chamber 43 through a gas pipe 19, and the air outlet 3 is not communicated with the internal space of the dust removal housing 1.

[0046] An air bag 42 is connected with an air pump. The air pump is used to inflate the filter bag 41 to remove the particulate dust on the filter bag 41.

[0047] Working process: When the boiler flue gas enters from the air inlet 2, the first electric area 11 and the second electric area 12 in the dust removal housing 1 will be powered on, so that the electrode plates 16 and the electrode wires 17 are respectively charged with positive and negative electrons. The large particulate dust in the flue gas will be adsorbed on the electrode plates 16. When the dust particles on the electrode plates 16 are adsorbed to a certain amount, the vibration motor on the electrode plates 16 will be started and drive the electrode plates 16 to vibrate, so as to vibrate and shed the dust particles attached to the electrode plates 16. The dust particles will fall into the lower hopper 18.

[0048] After the flue gas removes large particulate dust in the first electric area 11 and the second electric area 12, the flue gas will continue to enter the first bag area 13, the second bag area 14 and the third bag area 15. If the flue gas volume is large, it will be continuously dust-removed through the first bag area 13, the second bag area 14 and the third bag area 15. If the flue gas volume is small, it may directly enter the clean gas chamber 43 after being dust-removed by the first bag area 13. The flue gas passes through the vertically placed filter bag 41, and the filter bag 41 will filter out the fine particulate dust in the flue gas and make the dust adhere to the outer surface of the filter bag 41, so as to further dust-remove the flue gas. The dust-removed flue gas will move upward through the filter bag 41 and enter the internal of the clean gas chamber 43, and then flow into the other end of the dust removal housing 1 through the gas pipe 19 on the clean gas chamber 43, and finally discharge the flue gas from the air outlet 3, thus realizing the dust removal of the flue gas.

[0049] When a certain amount of flue gas is processed, the externally connected air pump will start and inflate the air bag 42. After the gas enters the air bag 42, it will enter the interior of the filter bag 41 along the connecting pipe 5, causing the filter bag 41 to inflate and expand, thereby removing the fine dust particles on the filter bag 41 and falling into the ash hopper 18 below for collection. During the dust removal process, the removal and collection of the fine dust particles on the filter bag 41 are carried out simultaneously, greatly improving the efficiency of flue gas dust removal.

[0050] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. However, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An electrostatic precipitator for a fluidized bed boiler, comprising: A dust removal housing (1), wherein one end of the dust removal housing (1) is provided with an air inlet (2), and the other end is provided with an air outlet (3); the dust removal housing (1) is characterized in that the interior of the dust removal housing (1) is divided into a first electric area (11), a second electric area (12), a first bag area (13), a second bag area (14), and a third bag area (15) in sequence from the air inlet (2) to the air outlet (3), and further comprises: A plurality of dust removal mechanisms (4) are respectively arranged in the first bag area (13), the second bag area (14) and the third bag area (15), and are used to further absorb and remove fine dust particles in the flue gas; the dust removal mechanism (4) comprises: A plurality of filter bags (41) are connected to the dust removal housing (1) via a plurality of connecting pipes (5) and are used to absorb fine dust particles in the flue gas; A plurality of air bags (42) are connected to the connecting pipe (5) on the dust removal housing (1), and are used to inflate the filter bag (41) through the connecting pipe (5), thereby causing the dust particles on the outer surface of the filter bag (41) to fall off; A clean air chamber (43) is provided in the dust removal housing (1), is in communication with the ends of the first bag area (13), the second bag area (14) and the third bag area (15) and is connected to the gas outlet (3), and is used for collecting the treated exhaust gas and passing it into the other end of the dust removal housing (1) to be discharged from the gas outlet (3).

2. The electrostatic precipitator for a fluidized bed boiler according to claim 1, characterized in that: The first electric zone (11) and the second electric zone (12) on the dust removal housing (1) are respectively provided with a plurality of pole plates (16) and a plurality of pole lines (17); the plurality of pole plates (16) and the plurality of pole lines (17) are arranged at intervals; and a vibration motor is provided on the pole plate (16).

3. The electrostatic precipitator for a fluidized bed boiler according to claim 2, characterized in that: The first electric region (11) is a high voltage electric region, and the second electric region (12) is a low voltage electric region.

4. The electrostatic precipitator for a fluidized bed boiler according to claim 1, characterized in that: The plurality of filter bags (41) are respectively arranged vertically in a rectangular array; the top ends of the plurality of filter bags (41) are connected to the connecting pipe (5), and the bottom ends are free ends.

5. The electrostatic precipitator for a fluidized bed boiler according to claim 1, characterized in that: The filter bag (41) is a cylindrical structure and can expand radially.

6. The electrostatic precipitator for a fluidized bed boiler according to claim 1, characterized in that: The length of the filter bag (41) is 2 / 3 of the height of the dust removal housing (1).

7. The electrostatic precipitator for a fluidized bed boiler according to claim 1, characterized in that: An ash hopper (18) is provided at the bottom of the dust removal housing (1), and the ash hopper (18) is in communication with the dust removal housing (1) and is used to collect falling dust particles.

8. The electrostatic precipitator for a fluidized bed boiler according to claim 1, characterized in that: The air outlet (3) is in communication with the clean air chamber (43) via an air pipe (19), and the air outlet (3) is not in communication with the internal space of the dust removal housing (1).

9. The electrostatic precipitator for a fluidized bed boiler according to claim 1, characterized in that: The air bag (42) is connected to an air pump.

Images