Cloth bag powder pre-coating device suitable for waste incineration flue gas deacidification system

Abstract

The utility model discloses a cloth bag powder pre-coating device suitable for a waste incineration flue gas deacidification system. The cloth bag powder pre-coating device comprises a Roots blower, a feeding hopper, a spiral conveyor, an air supply pipe, a conveying hose and a moving trolley, the Roots blower, the feeding hopper and the spiral conveyor are all arranged on the moving trolley, an air supply pipe is arranged at an air outlet of the Roots blower, the discharging end of the feeding hopper is connected with the feeding end of the spiral conveyor, the discharging end of the spiral conveyor is connected with the air supply pipe, and the feeding end of the conveying hose is connected with the air supply pipe. The discharging end of the conveying hose is detachably connected with a flange connector on the side portion of the flue. When the cloth bag needs to be coated with powder, sodium hydroxide powder in the feeding hopper is sprayed into the flue through the air supply pipe and the conveying hose under the action of the Roots blower, enters the smoke chamber along with air inlet flow and is attached to the outer surface of the cloth bag. The semi-automatic sodium hydroxide spraying device has the advantages of being compact in structure, convenient to use, high in stability and the like, semi-automatic sodium hydroxide spraying is achieved, and the risk of bag hanging operation is reduced.

Description

Technical Field

[0001] This utility model relates to the field of waste incineration flue gas treatment technology, specifically to a bag pre-coating powder device suitable for waste incineration flue gas deacidification systems. Background Technology

[0002] Before starting up a waste incinerator, sodium hydroxide is typically manually sprinkled into the inlet of the baghouse dust collector to coat the surface of the filter bags, forming a protective layer. This process is commonly known in the industry as "bag hanging." Bag hanging prevents incomplete combustion of oil particles from the oil gun during the start-up and heating process, which could cause the bags to become clogged, lose their dust-filtering ability, and increase the differential pressure of the baghouse dust collector.

[0003] The amount of sodium hydroxide added before each furnace start-up varies, and the inlet is approximately 10 meters above the ground. This requires manual transport of the sodium hydroxide to a high position, which is labor-intensive and easily pollutes the surrounding environment. During the bag-hanging and dispensing process, the sodium hydroxide packaging bags are manually cut open, and the powdered sodium hydroxide is drawn into the flue through the negative pressure. The high negative pressure in the flue means that even slight carelessness during operation can easily lead to the packaging bags or other objects being sucked into the flue, posing a significant risk to the operators. Furthermore, the weight of sodium hydroxide cannot be precisely controlled during each bag-hanging process. To prevent exceeding flue gas emission standards, excessive sodium hydroxide may be added to control flue gas parameters, resulting in wasted sodium hydroxide and increased costs. Utility Model Content

[0004] The technical problem this utility model aims to solve is to overcome the shortcomings of existing methods where the process of applying sodium hydroxide to hanging bags relies entirely on manual labor, which is not only labor-intensive and risky, but also unable to accurately control the quality of the applied sodium hydroxide. This utility model provides a bag pre-coating powder device that is compact, easy to use, highly stable, and can accurately control the amount of sodium hydroxide applied, suitable for waste incineration flue gas desulfurization systems.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] A pre-coating device for filter bags suitable for a waste incineration flue gas desulfurization system is disclosed. The filter bags are installed on a partition between the dust chamber and the exhaust chamber. The pre-coating device is connected to a flange interface on the side of the flue. The pre-coating device includes: a Roots blower, a feed hopper, a screw conveyor, an air supply pipe, a conveying hose, and a mobile trolley. The Roots blower, feed hopper, and screw conveyor are all mounted on the mobile trolley. The air outlet of the Roots blower is equipped with an air supply pipe. The discharge end of the feed hopper is connected to the feed end of the screw conveyor. The discharge end of the screw conveyor is connected to the air supply pipe through a pipe. The feed end of the conveying hose is connected to the air supply pipe. The discharge end of the conveying hose is detachably connected to the flange interface on the side of the flue. When it is necessary to coat the filter bags with powder, sodium hydroxide powder in the feed hopper is sprayed into the flue through the air supply pipe and conveying hose under the action of the Roots blower, and enters the dust chamber with the incoming airflow, adhering to the outer surface of the filter bags.

[0007] As a further improvement of this utility model, it also includes a weighing sensor located below the feed hopper for detecting changes in the weight of the feed hopper.

[0008] As a further improvement of this utility model, it also includes a control cabinet, which is connected to the Roots blower, the weighing sensor and the screw conveyor respectively. The control cabinet controls the start and stop of the Roots blower and the screw conveyor according to the weight information of the feed hopper fed back by the weighing sensor.

[0009] As a further improvement of this utility model, an ash discharge valve is provided on the pipe between the discharge end of the screw conveyor and the air supply pipe.

[0010] As a further improvement of this utility model, the feed end of the feed hopper is provided with a filter screen.

[0011] As a further improvement of this utility model, the air supply pipe is made of corrosion-resistant hard alloy pipe.

[0012] Compared with the prior art, the advantages of this utility model are:

[0013] 1. This utility model relates to a pre-coating device for filter bags in a waste incineration flue gas desulfurization system. The device comprises a Roots blower, a feed hopper, and a screw conveyor, all mounted on a mobile trolley. The screw conveyor is connected to the discharge port of the feed hopper and the air supply pipe of the Roots blower. The air supply pipe is then detachably connected to a flange interface on the side of the flue via a flexible conveying hose. This forms a compact and easy-to-operate pre-coating device for filter bags, which can be flexibly moved according to actual coating needs. When powder coating is required, the operator adds sodium hydroxide to the feed hopper and uses the Roots blower to spray it into the flue. The sodium hydroxide then enters the dust chamber with the incoming airflow and adheres to the outer surface of the filter bags. The powdered sodium hydroxide is transported to the inlet flue of the filter bag through the Roots blower and the negative pressure of the flue, significantly saving manpower and reducing operational risks.

[0014] 2. The bag pre-coating powder device of this utility model, applicable to the flue gas desulfurization system of waste incineration, achieves precise control of the added weight of sodium hydroxide by setting a weighing sensor, thereby avoiding material waste and saving costs. Attached Figure Description

[0015] Figure 1 This is a schematic diagram illustrating the structural principle of the pre-coating powder device in a specific embodiment of this utility model;

[0016] Legend: 1. Roots blower; 2. Control cabinet; 3. Filter screen; 4. Feed hopper; 5. Weighing sensor; 6. Screw conveyor; 7. Ash discharge valve; 8. Air supply duct; 9. Conveying hose; 10. Mobile trolley; 11. Flange interface; 12. Flue. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and specific preferred embodiments, but this does not limit the scope of protection of the present invention.

[0018] In the description of this utility model, it should be understood that the terms "side", "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0019] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "multiple" means two or more, unless otherwise explicitly specified.

[0020] Example

[0021] This utility model discloses a bag filter pre-coating device suitable for a waste incineration flue gas desulfurization system. According to conventional settings in the field, the filter bag is installed on a partition between the dust chamber and the exhaust chamber, and the pre-coating device is connected to the flange interface 11 on the side of the flue 12. For example... Figure 1 As shown, the pre-coating device includes: a Roots blower 1, a feed hopper 4, a screw conveyor 6, an air supply pipe 8, a conveying hose 9, and a mobile trolley 10. The Roots blower 1, feed hopper 4, and screw conveyor 6 are all mounted on the mobile trolley 10. The air outlet of the Roots blower 1 is equipped with the air supply pipe 8. The discharge end of the feed hopper 4 is connected to the feed end of the screw conveyor 6, and the discharge end of the screw conveyor 6 is connected to the air supply pipe 8 via a pipe. The feed end of the conveying hose 9 is connected to the air supply pipe 8, and the discharge end of the conveying hose 9 is detachably connected to the flange interface 11 on the side of the flue 12. When powder coating of the filter bags is required, the operator stands on the side of the mobile trolley 10 and pours sodium hydroxide powder into the feed hopper 4. Under the action of the Roots blower 1, the sodium hydroxide powder in the feed hopper 4 is sprayed into the flue 12 through the air supply pipe 8 and the conveying hose 9, and enters the dust chamber with the incoming airflow, adhering to the outer surface of the filter bags.

[0022] In this embodiment, the Roots blower 1, the feed hopper 4, and the screw conveyor 6 are all mounted on the mobile trolley 10. The screw conveyor 6 is connected to the discharge port of the feed hopper 4 and the air supply pipe 8 of the Roots blower 1. The air supply pipe 8 is then detachably connected to the flange interface 11 on the side of the flue 12 via the conveying hose 9. This forms a compact and easy-to-operate pre-coating device for the bag filter dust collector, which can be flexibly moved according to actual powder coating needs. When powder coating of the filter bags is required, the operator puts sodium hydroxide into the feed hopper 4, and then uses the Roots blower 1 to spray the sodium hydroxide into the flue. The sodium hydroxide enters the dust chamber with the incoming airflow and adheres to the outer surface of the filter bags. The powdered sodium hydroxide is transported to the inlet flue of the bag filter dust collector by the Roots blower 1 and the negative pressure of the flue. This greatly saves manpower and reduces operational risks.

[0023] like Figure 1As shown, it also includes a weighing sensor 5. The weighing sensor 5 is mounted on the mobile trolley 10 and located below the feed hopper 4 to detect changes in the weight of the feed hopper 4 in real time, thereby achieving precise control of the sodium hydroxide dosage. It can be understood that both the feed hopper 4 and the weighing sensor 5 can be mounted on the mobile trolley 10 using appropriate mounting brackets, which will not be described in detail here.

[0024] like Figure 1 As shown, it also includes a control cabinet 2. The control cabinet 2 is mounted on the mobile chute 12 and connected to the Roots blower 1, the weighing sensor 5, and the screw conveyor 6. Based on the weight information of the feed hopper 4 fed back by the weighing sensor 5, the control cabinet 2 controls the start and stop of the Roots blower 1 and the screw conveyor 6 to automatically dispense sodium hydroxide powder into the flue 12 and coat the outside of the filter bag. Specifically, the control cabinet 2 can be a PLC control cabinet, which is simple in principle and provides precise control.

[0025] like Figure 1 As shown, an ash discharge valve 7 is installed on the pipe between the discharge end of the screw conveyor 6 and the air supply pipe 8. The ash discharge valve 7 is used to control the opening and closing of the screw conveyor 6 and the air supply pipe 8, thereby precisely controlling the amount of sodium hydroxide powder dispensed. It can be understood that in other embodiments, the ash discharge valve 7 can also be connected to the control cabinet 2, and the opening and closing of the ash discharge valve 7 can be controlled by the control cabinet 2 to improve the degree of automation.

[0026] like Figure 1 As shown, the feed end of the feed hopper 4 is equipped with a filter screen 3. The filter screen 3 can be in the form of a grid filter screen. After the sodium hydroxide powder is filtered, it enters the feed hopper 4 to prevent external impurities from falling into the feed hopper 4 and improve the purity of the feed.

[0027] In this embodiment, the air supply duct 8 is made of corrosion-resistant hard alloy pipe, which has high structural strength, long service life and can ensure stable air output.

[0028] Before starting the furnace, the pre-coating powder device is moved to the bottom of the bag filter flue using a mobile trolley 10, and the conveying hose 9 is connected to the temporary interface of the flue 12. When sprinkling bagged sodium hydroxide, the sodium hydroxide is fed into the feed hopper 4 after passing through the filter screen 3. The weight of the feed hopper 4 is monitored in real time by the weighing sensor 5. When the preset weight is reached, the Roots blower 1, screw conveyor 6, and ash discharge valve 7 are started. The sodium hydroxide powder is sprayed into the flue 12 through the air supply pipe 8 and the conveying hose 9, and enters the dust chamber with the airflow, adhering to the outer surface of the filter bags. This effectively avoids the operational risks of operators standing at the flue manhole to sprinkle bagged sodium hydroxide, and by precisely controlling the weight of the added material, waste is avoided and costs are reduced.

[0029] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A bag pre-coating powder device suitable for a waste incineration flue gas deacidification system, the bag is installed on the partition plate between the dust chamber and the exhaust chamber, the pre-coating powder device is connected with the flange interface (11) of the side part of the flue (12), characterized in that, The pre-coating powder device comprises a Roots blower (1), a feeding hopper (4), a screw conveyor (6), an air supply pipe (8), a conveying hose (9) and a mobile trolley (10); the Roots blower (1), the feeding hopper (4) and the screw conveyor (6) are all arranged on the mobile trolley (10), the air outlet of the Roots blower (1) is provided with the air supply pipe (8), the discharge end of the feeding hopper (4) is connected with the feeding end of the screw conveyor (6), the discharge end of the screw conveyor (6) is connected with the air supply pipe (8) through a pipeline, the feeding end of the conveying hose (9) is connected with the air supply pipe (8), and the discharge end of the conveying hose (9) is detachably connected with a flange interface (11) on the side of a flue (12); when it is needed to coat the bag with powder, the sodium hydroxide powder in the feeding hopper (4) is sprayed into the flue (12) through the air supply pipe (8) and the conveying hose (9) under the action of the Roots blower (1), and enters a dust chamber along with the air flow, and is attached to the outer surface of the bag.

2. The bag pre-coating powder device suitable for the waste incineration flue gas deacidification system according to claim 1, characterized in that, A weighing sensor (5) is further arranged below the feeding hopper (4) to detect the weight change of the feeding hopper (4).

3. The bag pre-coating powder device suitable for the waste incineration flue gas deacidification system according to claim 2, characterized in that, A control cabinet (2) is further arranged and connected with the Roots blower (1), the weighing sensor (5) and the screw conveyor (6), respectively; the control cabinet (2) controls the Roots blower (1) and the screw conveyor (6) to start or stop according to the weight information of the feeding hopper (4) fed back by the weighing sensor (5).

4. The bag pre-coating powder device for the waste incineration flue gas deacidification system according to any one of claims 1 to 3, characterized in that, A dust valve (7) is arranged on the pipeline between the discharge end of the screw conveyor (6) and the air supply pipe (8).

5. The bag pre-coat powder applicator suitable for use in a waste incineration flue gas deacidification system according to any one of claims 1 to 3, characterized in that, A filter screen (3) is arranged at the feeding end of the feeding hopper (4).

6. The bag pre-coat powder applicator suitable for use in a waste incineration flue gas deacidification system according to any one of claims 1 to 3, characterized in that, The air supply pipe (8) is made of a corrosion-resistant hard alloy pipe. The air supply pipe (8) is made of a corrosion-resistant hard alloy pipe.

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