A high-temperature flue gas dust removal device for coal gasification

Abstract

The utility model discloses a kind of high-temperature flue gas dust removal devices for coal gas, it is related to cloth bag dust removal technical field, including tank body, several cloth bags are equipped in tank body, tank body is connected with air inlet pipe;At least two air supplement pipes are connected with air inlet pipe side;Fan is connected with air supplement pipe air inlet side, valve is connected between fan air outlet side and air supplement pipe air inlet side, filter cloth is equipped in fan air inlet side;The utility model introduces normal temperature air by air supplement pipe and fan, mixes with high-temperature flue gas, promotes high-temperature flue gas to enter tank body and quickly cools down;New dust impurities are avoided by filter cloth mixing;More than two air supplement pipes cooperate valve opening and closing, and the filter cloth can be replaced without stopping.

Description

Technical Field

[0001] This utility model relates to the field of baghouse dust collection technology, and in particular to a high-temperature flue gas dust removal device for coal gasification. Background Technology

[0002] High-temperature flue gas generated during coal gasification is an industrial waste gas with specific components and characteristics. Its treatment and utilization are crucial for the environmental protection and energy efficiency of the coal gasification industry. Coal gasification is the process of converting coal into syngas (mainly composed of CO, H2, etc.) through a gasification reaction. During the gasification process, the combustion or partial oxidation of coal releases a large amount of heat and generates high-temperature flue gas.

[0003] The dust particles are relatively small and require treatment using a bag filter before being discharged. However, the flue gas produced by coal gasification has a high temperature, typically ranging from 300 to 1000°C, depending on the gasification process and waste heat recovery stage. For example, the flue gas temperature at the outlet of a fluidized bed gasifier can reach over 1000°C, and even after being transported by a fan and undergoing waste heat recovery, the flue gas temperature can still reach over 100°C.

[0004] Excessively high flue gas temperatures can significantly shorten the lifespan of filter bags when they are subjected to prolonged high temperatures. For example, aramid filter bags will experience amide bond breakage when operating at temperatures above 260°C for extended periods; polyester filter bags will slowly shrink at temperatures above 130°C, leading to friction damage between the filter bag and the cage. Utility Model Content

[0005] The purpose of this utility model is to solve at least one of the problems in the prior art mentioned above, and to provide a high-temperature flue gas dust removal device for coal gasification, which can reduce the temperature of high-temperature flue gas and ensure the normal operation of the filter bag.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A high-temperature flue gas dust removal device for coal gasification includes a tank body with several filter bags inside. The tank body is connected to an air inlet pipe. At least two make-up air pipes are connected to the side of the air inlet pipe. A fan is connected to the air inlet side of the make-up air pipe. A valve is connected between the air outlet side of the fan and the air inlet side of the make-up air pipe. A filter cloth is provided on the air inlet side of the fan.

[0008] Furthermore, the supplemental air pipe is inclinedly connected to one side of the intake pipe.

[0009] Furthermore, an expansion joint is connected to the air intake end of the air intake pipe.

[0010] Furthermore, a filter screen is provided between the filter cloth and the air inlet side of the fan.

[0011] Furthermore, the air supply pipe is equipped with a backflow preventer.

[0012] Furthermore, the anti-backflow damper includes a baffle plate with two air holes, and two sealing plates corresponding to the two air holes are hinged to the side of the baffle plate facing away from the fan.

[0013] Furthermore, the tank is connected to an exhaust pipe, and a horizontal partition is provided on the upper part of the tank. The air inlet pipe and the exhaust pipe are located on the upper and lower sides of the partition, respectively. The opening of the cloth bag is connected to the partition, and the partition is provided with a through hole corresponding to the opening of the cloth bag.

[0014] Furthermore, an air duct is connected to the lower side of the partition, and all the cloth bags are located inside the air duct.

[0015] Furthermore, the inner and outer sides of the tank sidewall are provided with several vertical heat dissipation ribs.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] This invention introduces room temperature air through an air supply pipe and a fan, which mixes with high-temperature flue gas, causing the high-temperature flue gas to cool down rapidly when it enters the tank; the filter cloth prevents the mixing of new dust impurities; and with two or more air supply pipes and valve opening and closing, the filter cloth can be replaced without stopping the machine. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0019] Figure 2 This is a schematic diagram of the air intake structure of this utility model.

[0020] Figure 3 This is an explosion diagram of the gas replenishment structure of this utility model.

[0021] Figure 4 This is a bottom side view of the anti-backflow door of this utility model.

[0022] Figure 5 This is a schematic diagram of the internal structure of the tank of this utility model.

[0023] In the diagram: 1. Tank; 2. Filter bag; 3. Inlet pipe; 4. Make-up pipe; 5. Fan; 6. Valve; 7. Filter cloth; 8. Flange cover; 9. Filter screen; 10. Baffle; 11. Sealing plate; 12. Limiting rod; 13. Expansion joint; 14. Exhaust pipe; 15. Baffle; 16. Air duct; 17. Heat dissipation fins; 18. Insulation layer. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0025] Specific embodiments of the high-temperature flue gas dust removal device for coal gasification provided by this utility model:

[0026] This embodiment is applied to a centralized clean industrial gas production project, with a total investment of 1.03 billion yuan, covering an area of ​​162 mu, and a designed annual production capacity of 2.4 billion Nm³ of clean industrial gas. 3 Among them, the coal-to-gas project has an annual output value of approximately 1.15 billion yuan, becoming an important support for breaking through the energy bottleneck in the healthy development of green ceramics. Using baghouse dust collectors for waste gas treatment presents challenges. Due to the high temperature of the flue gas, the lifespan of the filter bags is significantly reduced under prolonged high temperatures. Initially, water mist cooling devices were installed at the inlet of the dust collector to lower the flue gas temperature. However, this increased the moisture content in the flue gas, easily causing bag clogging and shortening the bag cleaning cycle. Therefore, improvements were made.

[0027] Please see Figure 1-5 A high-temperature flue gas dust removal device for coal gasification includes a tank 1, the bottom of which is inverted conical in shape. A dust collection bin is connected to the lower side of the tank 1. Several cloth bags 2 are installed inside the tank 1. An air inlet pipe 3 is connected to the tank 1.

[0028] The intake pipe 3 has a flange at its intake end, through which an expansion joint 13 is connected. The expansion joint 13 has flanges at both ends; one end is connected to the intake pipe 3, and the other end is connected to the upstream pipeline that transports high-temperature flue gas. The expansion joint 13 can compensate for changes in the size of the pipeline in the axial direction. The upstream pipeline undergoes size changes due to thermal expansion and contraction, and the expansion joint 13 can adapt to these changes, ensuring a stable and reliable connection.

[0029] In this embodiment, two supplementary air pipes 4 are connected to the side of the air inlet pipe 3. The supplementary air pipes 4 are inclinedly connected to the upper side of the air inlet pipe 3, and the lower end of the supplementary air pipe 4 is closer to the tank body 1 than the upper end, so that the air moves towards the tank body 1, reducing the obstruction to the gas flow of high-temperature flue gas. The air supplemented by the supplementary air pipe 4 can quickly mix with the high-temperature flue gas in the air inlet pipe 3, quickly reducing the temperature of the high-temperature flue gas, thereby reducing the temperature of the flue gas in contact with the filter bag 2 in the tank body 1, avoiding rapid damage to the filter bag 2, and ensuring the long-term normal use of the filter bag 2. In some other embodiments, the supplementary air pipe 4 is inclinedly connected to the horizontal side of the air inlet pipe 3.

[0030] A valve 6 is connected sequentially to the outside of the air supply pipe 4, and a fan 5 is connected to the outside of the valve 6. The fan 5 is located on the air inlet side of the air supply pipe 4, and the valve 6 is located on the air outlet side of the fan 5. The fan 5 delivers ambient temperature air into the air supply pipe 4. When using a particular air supply pipe 4 for air supply, open the valve 6 and the fan 5. When not using a particular air supply pipe 4 for air supply, close the corresponding valve 6 and the fan 5 to maintain the seal of the air supply pipe 4.

[0031] The air supply pipe 4 has a flange at its outer end. The valve 6 is a manual slide gate valve with flanges at both ends. The blower 5 includes a cylindrical structure, inside which a motor and blades are installed. Both ends of the cylindrical structure have flanges. The air supply pipe 4 and the valve 6 are connected by flanges and bolts. The blower 5 and the valve 6 are also connected by flanges and bolts. The flange and bolt connection ensures the stability of the connection and allows for disassembly, facilitating the maintenance and replacement of components.

[0032] To prevent the introduction of external dust when introducing ambient air into the air inlet pipe 3, a filter cloth 7 is provided on the air inlet side of the fan 5. At the same time, to prevent the filter cloth 7 from being excessively deformed under the influence of airflow, a filter screen 9 is provided between the filter cloth 7 and the air inlet side of the fan 5.

[0033] Both the filter cloth 7 and the filter screen 9 are circular in shape, and both are connected to the outer ring side with flange rings. The flange cover 8 is provided on the outside of the flange ring of the filter cloth 7. The flange cover 8 can be fixed to the outside of the fan 5 by bolts. At the same time, the flange cover 8 presses the flange rings on the outer ring side of the filter cloth 7 and the filter screen 9 to fix the filter cloth 7 and the filter screen 9.

[0034] When the filter cloth 7 needs cleaning, close the corresponding valve 6, remove the flange cover 8, and the filter cloth 7 and filter screen 9 can be removed for cleaning. The filter cloths 7 outside the two air supply pipes 4 can be cleaned without stopping the machine, ensuring continuous operation of the equipment, reducing the interference of maintenance work on equipment operation and production, and improving efficiency and economic benefits.

[0035] To prevent high-temperature flue gas from leaking from the air supply pipe 4 and to improve safety, a backflow preventer is installed inside the air supply pipe 4. The backflow preventer includes a baffle 10, which is a circular plate connected to the inside of the air supply pipe 4 to separate it. Two semi-circular air holes are symmetrically provided on the baffle 10. Two sealing plates 11, corresponding to the two air holes, are symmetrically hinged to the side of the baffle 10 facing away from the fan 5.

[0036] The sealing plate 11 is a semi-circular plate structure, with its straight edge hinged to the baffle 10. The sealing plate 11 adopts a hollow structure to reduce weight. When the fan 5 brings airflow into the air supply pipe 4, the airflow causes the sealing plate 11 to open automatically. When there is reverse airflow, the airflow causes the sealing plate 11 to automatically close the air hole, thereby preventing the leakage of high-temperature flue gas.

[0037] In some cases of misoperation, such as valve 6 opening when it should not, the backdraft damper can effectively improve safety.

[0038] The lower part of the air supply pipe 4 is provided with a limiting rod 12. When the sealing plate 11 is in contact with the baffle 10, the angle is zero. After rotating 60 degrees, the middle part of the arc edge contacts the limiting rod 12. The limiting rod 12 restricts the opening angle of the sealing plate 11, and at the same time, it makes it easier for the sealing plate 11 to close the air hole when there is reverse airflow. In some embodiments, the sealing plate 11 is provided with a rubber sealing gasket on the side facing the baffle 10 to improve the sealing effect.

[0039] In this embodiment, the tank body 1 is connected to an exhaust pipe 14, and a horizontal partition 15 is provided on the upper part of the tank body 1. The air inlet pipe 3 and the exhaust pipe 14 are located on the upper and lower sides of the partition 15, respectively. The opening of the cloth bag 2 is connected to the partition 15. The partition 15 has a through hole corresponding to the opening of the cloth bag 2, and a bag cage supporting the cloth bag 2 is provided on the lower side of the edge of the through hole. The flue gas entering through the air inlet pipe 3 passes through the cloth bag 2, the dust is left on the outside of the cloth bag 2, the clean gas passes through the cloth bag 2, and then passes through the through hole of the partition 15 to enter the upper side of the partition 15, and finally is discharged from the exhaust pipe 14. In some embodiments, a backflush pipe corresponding to the cloth bag 2 is provided on the upper side of the partition 15. Backflush of the cloth bag 2 is prior art and will not be described in detail in this embodiment.

[0040] A guide duct 16 is connected to the lower side of the partition 15. The vertical center line of the guide duct 16 and the vertical center line of the tank 1 are on the same vertical line. An annular gap is formed between the guide duct 16 and the inner side of the tank 1. The cloth bags 2 are all located inside the guide duct 16.

[0041] The lower end of the air guide duct 16 extends to the lower part of the tank body 1, and has a vertical gap with the tapered part at the lower end of the tank body 1. The lower end of the air guide duct 16 is connected to the inner wall of the tank body 1 by several support rods. The flue gas from the air inlet pipe 3 first enters the gap between the air guide duct 16 and the tank body 1. The air inlet pipe 3 is tangentially connected to the tank body 1, and the airflow spirals downward. Some of the larger dust particles fall against the wall, while the smaller dust particles bypass the lower end of the air guide duct 16, turn upward, and pass through the filter bag 2 to achieve dust removal.

[0042] The air duct 16 ensures that the flue gas entering the tank 1 first makes full contact with the inner wall of the tank 1. Several vertical heat dissipation ribs 17 are provided on both the inner and outer sides of the side wall of the tank 1. The inner heat dissipation ribs 17 increase the contact area with the flue gas, while the outer heat dissipation ribs 17 increase the heat dissipation area, improving the heat dissipation and cooling capacity of the tank 1, further reducing the flue gas temperature, slowing down the rate of heat accumulation, and further lowering the temperature of the flue gas before it comes into contact with the filter bag 2. In this embodiment, the heat dissipation ribs 17 also serve to improve the strength of the tank 1. A heat insulation layer 18 is provided on the inner side of the air duct 16. If a high-temperature heat insulation cloth is used, it reduces heat transfer to the filter bag 2 and facilitates heat transfer to the side wall of the tank 1.

[0043] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A high-temperature flue gas dust removal device for coal gasification, comprising a tank (1), wherein a plurality of cloth bags (2) are provided inside the tank (1), and an air inlet pipe (3) is connected to the tank (1); characterized in that, At least two supplementary air pipes (4) are connected to the side of the air inlet pipe (3); a fan (5) is connected to the air inlet side of the supplementary air pipe (4), a valve (6) is connected between the air outlet side of the fan (5) and the air inlet side of the supplementary air pipe (4), and a filter cloth (7) is provided on the air inlet side of the fan (5).

2. The high-temperature flue gas dust removal device for coal gasification according to claim 1, characterized in that, The supplemental air pipe (4) is inclinedly connected to one side of the intake pipe (3).

3. The high-temperature flue gas dust removal device for coal gasification according to claim 1, characterized in that, The intake pipe (3) has an expansion joint (13) connected to its intake end.

4. The high-temperature flue gas dust removal device for coal gasification according to claim 1, characterized in that, A filter screen (9) is provided between the filter cloth (7) and the air inlet side of the fan (5).

5. The high-temperature flue gas dust removal device for coal gasification according to claim 1, characterized in that, The air supply pipe (4) is equipped with a backflow preventer.

6. The high-temperature flue gas dust removal device for coal gasification according to claim 5, characterized in that, The backflow preventer includes a baffle (10), which has two air holes. Two sealing plates (11) corresponding to the two air holes are hinged to the side of the baffle (10) facing away from the fan (5).

7. The high-temperature flue gas dust removal device for coal gasification according to claim 1, characterized in that, The tank (1) is connected to an exhaust pipe (14), and a horizontal partition (15) is provided on the upper part of the tank (1). The air inlet pipe (3) and the exhaust pipe (14) are located on the upper and lower sides of the partition (15), respectively. The opening of the cloth bag (2) is connected to the partition (15), and the partition (15) is provided with a through hole corresponding to the opening of the cloth bag (2).

8. The high-temperature flue gas dust removal device for coal gasification according to claim 7, characterized in that, The partition (15) is connected to the air duct (16) on the lower side, and the cloth bags (2) are all located inside the air duct (16).

9. The high-temperature flue gas dust removal device for coal gasification according to claim 8, characterized in that, The tank (1) has several vertical heat dissipation ribs (17) on both the inner and outer sides of its sidewall.

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