A dust removal device and system for dust-laden gas that is saturated or nearly saturated with steam.

Abstract

This utility model provides a dust removal device and system for dust-laden gas containing saturated or near-saturated steam, relating to the field of dust removal technology. It includes a horizontal centrifugal mixer and a bag filter. The horizontal centrifugal mixer comprises a horizontally arranged cylindrical shell, dust-laden gas pipes located at both ends of the cylindrical shell, and a mixed gas outlet. The mixed gas outlet, dust-laden gas pipes, and cylindrical shell are coaxially arranged. The inlet of the bag filter is connected to the mixed gas outlet. A spiral blade is provided inside the cylindrical shell, and a hot flue gas pipe is provided at one end of the cylindrical shell near the dust-laden gas pipe. The inlet direction of the hot flue gas pipe is tangential to the rotation direction of the spiral blades. This invention solves the technical problem in existing technologies where dust removal of saturated or near-saturated steam dust-laden gas results in condensation, causing dust to adhere to the surface of the filter element, leading to poor cleaning effect, filter element blockage, and dust collector failure.

Description

Technical Field

[0001] This utility model relates to the field of dust removal technology, and in particular to a dust removal device and dust removal system for dust-laden gas that is saturated or nearly saturated with steam. Background Technology

[0002] In the field of pulverized coal pyrolysis, whether it is the drying of coal or the extraction of some water vapor in the low-temperature section of the pyrolysis kiln for pulverized coal containing water, the water vapor contains a large amount of coal dust. The treatment of this dust often employs bag filters, spray towers, impact wet scrubbers, wet electrostatic precipitators, water film cyclone dust collectors, Venturi scrubbers, or air scrubbers.

[0003] When using only a bag filter, if dust-laden gas with saturated or near-saturated steam enters the bag filter where the ambient temperature is low, a large amount of condensate will be generated when the steam temperature is close to the dew point temperature. This causes dust to adhere to the surface of the filter element, resulting in poor dust removal, filter element blockage, and filter failure.

[0004] Similar to spray towers and water film cyclone dust collectors, coal powder with a fineness of less than 100 micrometers, especially when the particles are less than 20 micrometers, is difficult to dissolve in water, the dust is easily scattered, the environment is harsh, and the difficulty and cost of water treatment make it difficult for enterprises to survive.

[0005] Wet electrostatic precipitators are typically used as "fine" dust collectors in conjunction with other wet dust collectors. They have strict requirements on the dust concentration at the equipment inlet. In addition, they have high energy consumption, complex equipment, high maintenance costs, and are not suitable for hydrophobic dust. In particular, the dust is conductive, and internal electrical sparks can cause production and safety accidents.

[0006] In view of the above, this utility model is hereby proposed. Utility Model Content

[0007] One of the objectives of this invention is to provide a dust removal device for dust-laden gas that is saturated or nearly saturated with steam, in order to solve the technical problem that dust removal of dust-laden gas that is saturated or nearly saturated with steam will produce a large amount of condensate water, causing dust to adhere to the surface of the filter element, resulting in poor dust removal effect, filter element blockage, and dust collector failure.

[0008] The second objective of this invention is to provide a dust removal system for dust-laden gas that is saturated or nearly saturated with steam.

[0009] In order to achieve the above-mentioned objectives of this utility model, the following technical solution is adopted:

[0010] In the first aspect, this utility model provides a dust removal device for dust-laden gas that is saturated or nearly saturated with steam, including a horizontal centrifugal mixer and a bag filter.

[0011] The horizontal centrifugal mixer includes a horizontally arranged barrel-shaped outer shell, dust-laden gas pipes located at both ends of the barrel-shaped outer shell, and a mixed gas outlet. The mixed gas outlet, dust-laden gas pipes, and barrel-shaped outer shell are arranged coaxially. The air inlet of the bag filter is connected to the mixed gas outlet.

[0012] The barrel-shaped outer shell is equipped with spiral blades. A hot flue gas pipe is provided at one end of the barrel-shaped outer shell near the dust-laden gas pipe. The air inlet direction of the hot flue gas pipe is set along the tangential direction of the barrel-shaped outer shell. A dust hopper for collecting dust is provided at one end of the barrel-shaped outer shell near the mixed gas outlet.

[0013] Furthermore, the bag filter is equipped with a tube sheet, which divides the bag filter into an upper chamber and a middle chamber. A filter unit is correspondingly provided on the tube sheet and located in the middle chamber, and the air inlet is located on the middle chamber.

[0014] Furthermore, a second ash hopper for collecting dust is provided below the middle box;

[0015] Preferably, the upper housing is provided with a gas outlet;

[0016] Preferably, the top of the filter unit is provided with a backflushing unit;

[0017] Preferably, the filter material of the filter unit is any one of PTFE, PPS or acrylic.

[0018] Furthermore, the middle box is provided with an upward air guide channel, which is connected to the air inlet.

[0019] Furthermore, the air guiding channel includes a flat plate and a vertical plate, and the vertical plate, the flat plate and the middle box cooperate with each other to form an air guiding channel;

[0020] Preferably, the vertical distance between the top plane of the upright plate and the lower end face of the flower plate is 0.3 to 1 m;

[0021] Preferably, the gas guiding channel is provided with a plurality of flow dividers, which cooperate with the gas guiding channel to disperse the gas in different directions;

[0022] Preferably, the bottom of the manifold is connected to the flat plate, and the top surface height of the manifold is the same as the top surface height of the air inlet;

[0023] Preferably, the plurality of the diverter plates are distributed in a fan shape along the surface of the flat plate.

[0024] Furthermore, the air guiding channel is a pipe structure;

[0025] Preferably, the vertical distance between the plane of the air outlet end of the pipe structure and the lower end face of the tube sheet is 1 / 3 to 1 / 3 of the diameter of the pipe structure;

[0026] Preferably, the pipe structure includes a vertical straight pipe and an elbow, with one end of the elbow connected to the air inlet and the other end of the elbow connected to the bottom of the vertical straight pipe.

[0027] Furthermore, the barrel-shaped outer shell is provided with an annular shell one and an annular shell two at its two ends, and the annular shell one is provided at the outlet of the mixed gas as the outlet of the mixed gas, while the annular shell two is connected to the dust-containing gas pipeline;

[0028] Preferably, the outlet of the mixed gas is connected to the inlet via a pipe.

[0029] Secondly, this utility model provides a dust removal system for dust-laden gas that is saturated or nearly saturated with steam, including the aforementioned dust removal device, induced draft fan, and dust collection equipment. The induced draft fan is connected to the outlet of the bag filter, and the dust collection equipment is located below the dust removal device.

[0030] Furthermore, the dust collection and recovery equipment includes a finished product silo, which is connected to ash hopper one and ash hopper two respectively;

[0031] Preferably, the dust collection and recovery equipment further includes a closed belt conveyor connected to the finished product silo;

[0032] Preferably, the finished product silo is connected to the ash hopper via a screw conveyor or a disc-type airlock discharge valve;

[0033] Preferably, the finished product silo is connected to the ash hopper via a screw conveyor or a disc-type airlock discharge valve.

[0034] Furthermore, the induced draft fan is connected to the gas outlet via pipe two.

[0035] This invention provides a dust removal device and system for dust-laden gas containing saturated or near-saturated steam. A hot flue gas duct transports the hot flue gas tangentially along a cylindrical outer shell into the inner cavity of a horizontal centrifugal mixer, facilitating uniform distribution and preheating. Simultaneously, the hot flue gas mixes and heats with the dust-laden gas input through the dust-laden gas duct in the direction of rotation, transforming it into dry dust-laden gas. This dry dust-laden gas then passes through a bag filter to remove dust. This invention solves the technical problem in existing technologies where dust removal of saturated or near-saturated steam dust-laden gas produces large amounts of condensate, causing dust to adhere to the filter element surface, resulting in poor cleaning, filter element blockage, and dust collector failure. Furthermore, it eliminates the water treatment pressure associated with spray-based dust removal methods, offering significant advantages over any other dust removal solution. Attached Figure Description

[0036] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0037] Figure 1 A schematic diagram of the structure of a dust removal device and dust removal system for dust-laden gas containing saturated or near-saturated steam, provided by this utility model. Figure 1 ;

[0038] Figure 2 A schematic diagram of the air guiding channel in the bag filter provided by this utility model;

[0039] Figure 3 A schematic diagram of the air guiding channels in a bag filter with multiple parallel arrangements provided by this utility model;

[0040] Figure 4 A schematic diagram of the structure of a dust removal device and dust removal system for dust-laden gas containing saturated or near-saturated steam, provided by this utility model. Figure 2 .

[0041] Icons: 1-Dust-laden gas duct; 2-Hot flue gas duct; 3-Horizontal centrifugal mixer; 31-Barrel-shaped outer shell; 32-Spiral blade; 33-Annular shell one; 34-Annular shell two; 35-Dust hopper one; 4-Pipe one; 5-Bag collector; 51-Upper box; 52-Tube plate; 53-Middle box; 54-Air inlet; 55-Dust hopper two; 56-Air guide channel; 561-Flat plate; 562-Vertical plate; 563-Diverter plate; 57-Filter unit; 58-Gas outlet; 59-Backflush unit; 6-Pipe two; 7-Exhaust fan; 81-Screw unloader; 82-Disc-type airlock unloading valve; 9-Enclosed belt conveyor; 10-Finished product silo. Detailed Implementation

[0042] Unless otherwise defined herein, the scientific and technical terms used in connection with this utility model shall have the meanings commonly understood by one of ordinary skill in the art. The meaning and scope of terms shall be clear; however, in any case of potential ambiguity, the definitions provided herein shall prevail over any dictionary or foreign definitions. In this application, unless otherwise stated, the use of "or" means "and / or". Furthermore, the use of the term "comprising" and other forms is non-limiting.

[0043] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0044] This utility model provides a dust removal device for dust-laden gas that is saturated or nearly saturated with steam, including a horizontal centrifugal mixer 3 and a bag filter 5.

[0045] The horizontal centrifugal mixer 3 includes a horizontally arranged barrel-shaped outer shell 31, a dust-laden gas pipeline 1 located at both ends of the barrel-shaped outer shell 31, and a mixed gas outlet. The mixed gas outlet, the dust-laden gas pipeline 1, and the barrel-shaped outer shell 31 are coaxially arranged. The air inlet 54 of the bag filter 5 is connected to the mixed gas outlet.

[0046] The barrel-shaped outer shell 31 is provided with a spiral blade 32. A hot flue gas pipe 2 is provided on one end of the barrel-shaped outer shell 31 near the dust-laden gas pipe 1. The air inlet direction of the hot flue gas pipe 2 is set along the tangential direction of the barrel-shaped outer shell 31. A dust hopper 35 for collecting dust is provided at the lower end of the barrel-shaped outer shell 31 near the mixed gas outlet.

[0047] The hot flue gas duct 2 can transport hot flue gas tangentially along the cylindrical outer shell 31 to the inner cavity of the horizontal centrifugal mixer 3, which facilitates uniform distribution and achieves uniform preheating. Simultaneously, it mixes and heats with the dust-laden gas input from the dust-laden gas duct 1 along the rotation direction, turning it into dry dust-laden gas. This dry dust-laden gas then passes through the bag filter 5, where dust is filtered out. This solves the technical problem in existing technologies where dust removal of saturated or near-saturated steam produces a large amount of condensate, causing dust to adhere to the filter element surface, resulting in poor cleaning effect, filter element blockage, and dust collector failure. Furthermore, it eliminates the water treatment pressure associated with spray dust removal methods, offering significant advantages over any other dust removal solution.

[0048] In some specific embodiments, the bag filter 5 is provided with a tube sheet 52, which divides the bag filter 5 into an upper chamber 51 and a middle chamber 53. A filter unit 57 is provided on the tube sheet 52 and is located inside the middle chamber 53. The air inlet 54 is located on the middle chamber 53.

[0049] In some specific embodiments, the middle housing 53 is provided with an upward air guide channel 56, which is connected to the air inlet 54.

[0050] The mixed gas is guided to the upper part of the middle chamber 53 through the upward air guide channel 56, and then turns back downward, which is consistent with the direction of dust falling in the filter chamber, thus improving the dust removal efficiency; otherwise, if the gas moves from bottom to top and the airflow direction is opposite to the direction of dust falling, the dust will repeatedly fall and rise under the influence of the airflow, and be filtered repeatedly, thus affecting the filtration efficiency.

[0051] In some specific embodiments, a second ash hopper 55 for collecting dust is provided below the middle box 53.

[0052] In some specific embodiments, the upper housing 51 is provided with a gas outlet 58. The gas outlet 58 may be located on the top or side of the upper housing 51.

[0053] In some specific embodiments, the top of the filter unit 57 is provided with a backflush unit 59.

[0054] In some specific embodiments, the filter material of the filter unit 57 is any one of PTFE, PPS, or acrylic. Optionally, the filter material includes a filter element or a filter bag, preferably a filter bag.

[0055] In some specific embodiments, the air guiding channel 56 includes a flat plate 561 and a vertical plate 562, which cooperate with each other to form the air guiding channel 56. In some specific embodiments, the vertical distance between the top plane of the vertical plate 562 and the lower end face of the perforated plate 52 is 0.3 to 1 m.

[0056] The vertical distance between the top plane of the vertical plate 562 and the bottom surface of the flower plate 52 can be, but is not limited to, 0.3m, 0.4m, 0.5m, 0.6m, 0.7m, 0.8m, 0.9m or 1m, or any value between 0.3m and 1m.

[0057] In some specific embodiments, the air guiding channel 56 is provided with a plurality of flow dividers 563, which cooperate with the air guiding channel 56 to disperse the gas in different directions, so that the airflow is evenly distributed inside. In some specific embodiments, the bottom of the flow divider 563 is connected to the plate 561, and the top height of the flow divider 563 is consistent with the top height of the air inlet 54. In some specific embodiments, the plurality of flow dividers 563 are distributed in a fan shape along the surface of the plate 561.

[0058] In some specific embodiments, the air guide channel 56 is a pipe structure; in some specific embodiments, the vertical distance between the plane where the air outlet of the pipe structure is located and the lower end face of the perforated plate 52 is 1 / 3 to 1 of the pipe structure diameter. In some specific embodiments, the pipe structure includes a vertical straight pipe and an elbow, one end of the elbow being connected to the air inlet 54, and the other end of the elbow being connected to the bottom of the vertical straight pipe.

[0059] In some specific embodiments, the barrel-shaped outer shell 31 is provided with annular shell 33 and annular shell 34 at both ends, and the mixed gas outlet is provided with annular shell 33 as the mixed gas outlet, and annular shell 34 is connected to the dust-containing gas pipeline 1.

[0060] In some specific embodiments, the mixed gas outlet is connected to the air inlet 54 via pipe 4.

[0061] In some specific embodiments, the barrel-shaped outer shell 31 is provided with a spiral blade 32.

[0062] To facilitate gas flow rate adjustment, a shut-off valve and a flow regulating valve are installed on the hot flue gas duct 2. This allows for duct opening and closing, and adjustment of flue gas flow rate, changing the mixing ratio of flue gas with dust-laden gas in saturated or near-saturated steam. This ensures the mixed gas has a suitable temperature, maintaining a dry state while ensuring the dust has appropriate humidity.

[0063] According to another aspect of the present invention, a dust removal system for dust-laden gas that is saturated or nearly saturated with steam is also provided, comprising the aforementioned dust removal device, induced draft fan 7, and dust collection equipment, wherein the induced draft fan 7 is connected to the outlet of the bag filter 5, and the dust collection equipment is located below the dust removal device.

[0064] The filtered gas is drawn out by the induced draft fan 7, and the dust collected by the dust removal equipment is recovered by the dust collection device. The system is reliable, requires little investment, is environmentally friendly, and has low operating costs.

[0065] To reduce the difficulty of dust collection, in some specific embodiments, the dust collection and recovery equipment includes a finished product silo 10, which is connected to ash hopper 35 and ash hopper 55 respectively. The dust collected by the dust collector falls into the finished product silo 10 and mixes with the finished product, so that the dust (fine coal powder) collected by the dust collector is directly mixed with the upgraded coal after pyrolysis to become the finished product, which greatly reduces the difficulty of dust collection.

[0066] In some specific embodiments, the dust collection and recovery equipment also includes a closed belt conveyor 9 connected to the finished product silo 10.

[0067] In some specific embodiments, the finished product silo 10 is connected to the ash hopper 35 via a screw conveyor 81 or a disc-type airlock discharge valve 82; in some specific embodiments, the finished product silo 10 is connected to the ash hopper 55 via a screw conveyor 81 or a disc-type airlock discharge valve 82.

[0068] In some specific embodiments, the induced draft fan 7 is connected to the gas outlet 58 via pipe 6.

[0069] The present invention will be further illustrated below through embodiments. Unless otherwise specified, the materials in the embodiments are prepared according to existing methods or purchased directly from the market.

[0070] The dust-laden gas in the following examples is a dust-laden gas containing saturated or near-saturated vapor.

[0071] Example 1

[0072] Combination Figure 1 The present invention describes a dust removal device for dust-laden gas containing saturated or near-saturated steam, comprising a horizontal centrifugal mixer 3 and a bag filter 5. The horizontal centrifugal mixer 3 includes a horizontal cylindrical shell 31, with spiral blades 32 disposed inside the cylindrical shell 31. An annular shell 33 is disposed at one end of the cylindrical shell 31, and the inner circle of the annular shell 33 is connected to the air inlet 54 of the bag filter by a pipe 4. An annular shell 34 is disposed at the other end of the cylindrical shell 31, and the inner circle of the annular shell 34 is connected to the dust-laden gas pipe 1. A hot flue gas pipe 2 is disposed near the annular shell 34 and tangentially to the cylindrical shell 31, and is connected to the inner cavity of the horizontal centrifugal mixer 3. A dust hopper 35 is disposed at the lower part of the cylindrical shell 31 near the annular shell 33 and is connected to the interior of the cylindrical shell 31.

[0073] The bag filter 5 consists of an upper housing 51, a middle housing 53, and a second ash hopper 55 arranged sequentially from top to bottom. A tube sheet 52 is installed between the upper housing 51 and the middle housing 53, and a filter unit 57 is installed corresponding to the tube sheet 52. A back-blowing unit 59 is installed on the top of the filter unit 57. A gas outlet 58 is provided on the top or side of the upper housing 51 and is connected to the induced draft fan 7. An air inlet 54 is provided on the side of the middle housing 53 and is connected to the annular shell of the horizontal centrifugal mixer. The upper end of the second ash hopper 55 is connected to the lower end of the middle housing 53. A disc-type airlock discharge valve 82 is installed below the second ash hopper 55. The disc-type airlock discharge valve has the function of isolating the air passage above and below the valve to prevent the gas in the ash hopper from escaping, while ensuring smooth material discharge.

[0074] In this example, the diameter of the inlet pipe for the dust-laden gas is DN250, and the diameter of the inlet pipe for the hot flue gas is DN125. The hot flue gas enters radially and forms turbulence with the axially input dust-laden gas under the spiral guidance, making it easy for the two gases to mix evenly. This causes the dust-laden gas to heat up and become dry dust-laden gas. Furthermore, under the action of centrifugal force, some dust can be pre-removed and enter the ash hopper, reducing the load on the bag filter.

[0075] A shut-off valve and a flow regulating valve are installed at the front end of the hot flue gas duct 2 entering the centrifugal mixer 3 to open and close the duct and regulate the flow rate of the hot flue gas, control the ratio of flue gas flow rate to dust-laden gas, and keep the temperature of the mixed gas in the bag filter between 110 and 180°C and the moisture content of the dust collected between 5 and 16%.

[0076] The baghouse dust collector consists of an upper housing 51, a middle housing 53, and a dust hopper 55 arranged from top to bottom. A gas outlet 58 is located at the top of the upper housing 51, which serves as the gas collection chamber and employs an integrated welded structure. A sealed manhole is located on its side. A tube sheet 52 is installed between the upper housing 51 and the middle housing 53, and a filter unit 57 is installed corresponding to the tube sheet 52. The filter material of the filter unit 57 is a PTFE filter bag with high temperature resistance, acid and alkali resistance, and good hydrophobicity. A back-flushing unit 59 is located at the top of the filter unit 57. An air inlet 54 located on the side of the middle housing 53 connects to the annular shell 33 of the horizontal centrifugal mixer. An upward-directing gas guide channel 56 is located at the position opposite the air inlet 54, connecting to the air inlet 54. The top of the gas guide channel 56 is 0.6 meters from the lower surface of the tube sheet 52.

[0077] Combination Figure 2 As explained, the air guide channel 56 consists of a vertical plate 562 and a flat plate 561. The flat plate 561 is positioned below the lower edge of the air inlet 54. One end of the flat plate 561 is fixedly connected to the side wall of the middle housing 53 on the air inlet side, and the other end is fixedly connected to the vertical plate 562. The cavity formed by the vertical plate 562, the flat plate 561, and the middle housing 53 is the air guide channel 56. According to the structure of the bag filter 5, multiple fan-shaped vertical diversion plates 563 can be installed inside the air guide channel 56.

[0078] Example 2

[0079] Combination Figure 3 To illustrate, unlike Example 1, this embodiment includes three baghouse dust collectors 5 arranged in parallel.

[0080] Example 3

[0081] Combination Figure 4To illustrate, unlike Embodiment 1, the air guide channel 56 is a pipe, which includes an upper vertical straight section and a lower elbow. One end of the elbow is connected to the straight section and the other end is connected to the air inlet 54. The distance between the top of the air guide channel and the lower surface of the tube sheet is 0.7 times the diameter of the air guide channel. No vertical diverter plate is installed in the air guide channel 56.

[0082] Example 4

[0083] Combination Figure 1 The following describes a dust removal system for saturated or near-saturated steam-laden dust-containing gas, comprising the dust removal device provided in Example 1, an induced draft fan 7, and a dust collection device. The inlet of the induced draft fan 7 is connected to the gas outlet 58 of the bag filter 5 via a second pipe 6. The dust collection device includes a finished product silo 10 and a closed belt conveyor 9.

[0084] The dust removal device is installed above the enclosed belt conveyor 9, which cools and humidifies the solid materials after coal pyrolysis, and the finished product silo 10. Specifically, a disc-type airlock discharge valve 82 is installed below the ash hopper 2 55 of the bag filter 5, allowing dust to fall directly into the finished product silo 10 through the valve. A screw conveyor 81 is installed below the ash hopper 1 37 to transport the dust into the finished product silo 10.

[0085] Example 5

[0086] Combination Figure 4 To illustrate, unlike Example 4, the dust removal device provided in Example 3 is used instead of the dust removal device provided in Example 1.

[0087] Working principle:

[0088] Combination Figure 1 The process involves first opening the hot flue gas duct 2 to preheat the horizontal centrifugal mixer 3 and the bag filter 5 to 130–160°C. Then, dust-laden gas containing saturated or near-saturated steam is introduced. The flow rate of the hot flue gas is adjusted according to the flow rate of the dust-laden gas containing saturated or near-saturated steam, the temperature of the mixed gas, and the humidity of the dust collected. The inlet temperature of the bag filter is controlled to be 110–180°C to obtain a dust moisture content of 5–16%, thus avoiding the dust from becoming too dry and easily causing dust to be generated.

[0089] The temperature of the hot flue gas is 150–300℃, preferably 180–260℃. The hot flue gas is industrial flue gas. By using this temperature range of waste flue gas as a mixture to heat saturated or near-saturated steam containing dust, the steam is kept in a dry state, thus realizing the utilization of industrial flue gas resources while saving costs.

[0090] Preheating prevents condensation from occurring in the dust-laden gas after it enters due to temperature drop. The dust-laden gas is heated by hot flue gas to obtain dry dust-laden gas, ensuring continuous and stable operation of the filter. This avoids the problem of dust ash not falling smoothly due to excessive moisture content, and in particular, it can prevent dust ash from sticking to the bag and causing filter failure.

[0091] Application examples

[0092] The dust concentration in the steam obtained during the pyrolysis of low-rank coal using low-temperature rotating bed technology is 10–15 g / m³. 3 The temperature is between 80 and 110°C, the humidity is between 50 and 100%, and the steam contains some oil and gas; the flue gas temperature for coal pyrolysis is between 150 and 300°C.

[0093] Using the dust removal system provided in Example 3, before production, the dust removal system is preheated to 130-160°C using waste heat flue gas at 180-260°C, and then dust-laden gas is introduced. The flow rate of the hot flue gas is adjusted according to the temperature of the mixed gas and the humidity of the dust, and the inlet temperature of the bag filter is controlled to be ≥110°C. The dust collector discharges continuous dry ash, and the moisture content of the discharged ash is about 10%. This not only meets the economic requirements of mixed air but also meets the gas transportation requirements of the dust. After long-term operation, the surface of the filter bags was inspected after disassembling the dust collector, and no bag clogging was found. The gas collection chamber was clean and dust-free, meeting the emission standards.

[0094] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A dust removal device for a dust-laden gas saturated or nearly saturated with steam, characterized by, Including a horizontal centrifugal mixer (3) and a bag filter (5); The horizontal centrifugal mixer (3) includes a horizontally arranged barrel-shaped shell (31), dust-laden gas pipes (1) located at both ends of the barrel-shaped shell (31), and a mixed gas outlet. The mixed gas outlet, dust-laden gas pipes (1) and barrel-shaped shell (31) are arranged coaxially. The air inlet (54) of the bag filter (5) is connected to the mixed gas outlet. The barrel-shaped outer shell (31) is provided with a spiral blade (32). A hot flue gas pipe (2) is provided at one end of the barrel-shaped outer shell (31) near the dust-laden gas pipe (1). The air inlet direction of the hot flue gas pipe (2) is set along the tangential direction of the barrel-shaped outer shell (31). A dust hopper (35) for collecting dust is provided at one end of the barrel-shaped outer shell (31) near the outlet of the mixed gas.

2. The dust extraction device of claim 1, wherein The bag filter (5) is provided with a tube sheet (52), which divides the bag filter (5) into an upper box (51) and a middle box (53). A filter unit (57) is provided on the tube sheet (52) and is located in the middle box (53). The air inlet (54) is located on the middle box (53).

3. The dust extraction device of claim 2, wherein, Below the middle box (53) is a ash hopper (55) for collecting dust. The upper housing (51) is provided with a gas outlet (58); The top of the filter unit (57) is provided with a backflush unit (59). The filter material of the filter unit (57) is any one of PTFE, PPS or acrylic.

4. The dust extraction device of claim 2, wherein The middle box (53) is provided with an upward air guide channel (56), which is connected to the air inlet (54).

5. The dust extraction device of claim 4, wherein, The air guide channel (56) includes a flat plate (561) and a vertical plate (562), and the vertical plate (562), the flat plate (561) and the middle box (53) cooperate with each other to form the air guide channel (56). The vertical distance between the top plane of the vertical plate (562) and the bottom surface of the flower plate (52) is 0.3~1m; The gas guiding channel (56) is provided with a plurality of flow dividers (563), which cooperate with the gas guiding channel (56) to disperse the gas to different directions; The bottom of the splitter plate (563) is connected to the flat plate (561), and the top surface height of the splitter plate (563) is consistent with the top surface height of the air inlet (54). Several of the aforementioned diverter plates (563) are distributed in a fan shape along the surface of the flat plate (561).

6. The dust extraction device of claim 4, wherein The air guide channel (56) is a pipe structure; The vertical distance between the plane where the air outlet of the pipe structure is located and the lower end face of the tube sheet (52) is 1 / 3 to 1 / 3 of the diameter of the pipe structure. The pipeline structure includes a vertical straight pipe and an elbow. One end of the elbow is connected to the air inlet (54), and the other end of the elbow is connected to the bottom of the vertical straight pipe.

7. The dust extraction device of claim 1, wherein The barrel-shaped outer shell (31) is provided with an annular shell one (33) and an annular shell two (34) at both ends respectively. The annular shell one (33) is provided at the mixed gas outlet as the mixed gas outlet, and the annular shell two (34) is connected to the dust-containing gas pipeline (1). The outlet of the mixed gas is connected to the inlet (54) through pipe 1 (4).

8. A dust removal system for a dust-laden gas saturated or nearly saturated with steam, characterized in that, The device includes the dust removal device, the induced draft fan (7) and the dust collection equipment as described in any one of claims 1 to 7, wherein the induced draft fan (7) is connected to the outlet of the bag filter (5) and the dust collection equipment is located below the dust removal device.

9. The dust extraction system of claim 8, wherein, The dust collection and recovery equipment includes a finished product silo (10), which is connected to ash hopper one (35) and ash hopper two (55) respectively; The dust collection and recycling equipment also includes a closed belt conveyor (9) connected to the finished product silo (10); The finished product silo (10) is connected to the ash hopper (35) via a screw unloader (81) or a disc-type airlock unloading valve (82); The finished product silo (10) is connected to the second ash hopper (55) via a screw unloader (81) or a disc-type airlock unloading valve (82).

10. The dust extraction system of claim 8, wherein, The induced draft fan (7) is connected to the gas outlet (58) through pipe two (6).

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