Desulfurization digester dust removal system with fluidizing air heating device

Abstract

The utility model relates to the technical field of desulfurization devices, in particular to a desulfurization digester dust removal system with a fluidizing air heating device, which comprises a digester main body internally provided with a cloth bag dust removal device, and the upper part of the digester main body conveys gas back to an absorption tower through a dust remover exhaust fan and a pipeline. The fluidization air pipeline is provided with a fluidization fan for providing fluidization air, the fluidization air pipeline extends into the digester main body and faces the bag-type dust removal device, and a steam heater for heating the fluidization air is arranged on the fluidization air pipeline. According to the utility model, the cloth bag dust removal device in the digester is heated and fluidized by utilizing the heated fluidizing air, and the water vapor content is reduced, so that the problems of cloth bag hardening and water vapor condensation generated in the operation process of the digester are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of desulfurization devices, in particular to a desulfurization digester dust removal system with a fluidized air heating device. Background Art

[0002] The desulfurization digester generates a large amount of water vapor during operation, and the condensation phenomenon is extremely obvious especially under low ambient temperature. As a result, the dust bag of the digester becomes seriously compacted. Secondly, the service life of the dust removal fan at the top of the digester is greatly shortened. Because the dust removal air duct of the digester is connected to the absorption tower body, a large amount of steam condensate enters the absorption tower, and part of the condensate enters the auger at the bottom of the tower, causing lumps and affecting the use of the auger. The specific causes of the above problems are all due to the condensation of water vapor generated during the operation of the digester. For this reason, this application proposes a desulfurization digester dust removal system with a fluidized air heating device. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides a desulfurization digester dust removal system with a fluidized air heating device. By adding a steam heater in the desulfurization digester dust removal system, the heated fluidized air is used to heat and fluidize the bag dust removal device in the digester, reducing the water vapor content, thereby solving the bag caking phenomenon and the problem of water vapor condensation generated during the operation of the digester.

[0004] The desulfurization digester dust removal system with fluidized air heating device in this scheme is mainly used for the treatment of heat and steam dust generated by the digester during the quicklime digestion process. It includes a digester main body with a bag dust removal device installed inside. The gas is transported back to the absorption tower through the dust collector exhaust fan and pipeline above the digester main body. It also includes a fluidized air duct for providing fluidized air. The fluidized air duct extends into the digester main body toward the bag dust removal device, wherein a steam heater for heating the fluidized air is provided on the fluidized air duct. Specifically, the fluidized air duct can provide fluidized air by installing a fluidizing fan.

[0005] The technical solution further defined in the present utility model is:

[0006] Furthermore, the fluidizing air duct is also connected to a fluidizing air branch duct, the other end of which is connected to a buffer silo pump. During the ash placement process, the fluidizing air maintains fluidization and heat preservation inside the silo pump, reduces silo blockage, and ensures the stability of the ash conveying system.

[0007] Furthermore, an air volume valve is provided on the fluidizing air branch pipe to control the air volume and opening and closing of the fluidizing air entering the buffer bin pump.

[0008] Furthermore, the steam heater is connected to a steam inlet pipe for providing steam, and the steam heater is also provided with a steam trap for conveying steam and discharging condensed water respectively.

[0009] Furthermore, the fluidizing air duct extends into the digester body through a U-shaped dust removal branch duct, and the opposite sides of the dust removal branch duct are distributed at the front and rear sides of the digester body, and the fluidizing air is input from the opposite sides of the digester body at the same time.

[0010] Furthermore, a plurality of dust removal branch pipes are connected to opposite sides of the dust removal branch pipe and extend into the digester body.

[0011] Furthermore, the bag dust removal device includes a plurality of bag dust collectors arranged in a row, and the front and rear sides of each bag dust collector correspond to the dust removal branch pipe, which can specifically be bags used to filter and collect dust.

[0012] The beneficial effects of the present invention are as follows: the present invention adds a steam heater to the desulfurization digester dust removal system, utilizes the heated fluidized air to heat and fluidize the bag dust removal device in the digester, reduces the water vapor content, and thus solves the problem of bag compaction and water vapor condensation generated during the operation of the digester. On the other hand, the desulfurization digester dust removal system of the present application connects the fluidized air after heat exchange to the buffer silo pump through another branch. During the ash placement process, the fluidized air maintains fluidization and heat preservation inside the silo pump, reduces silo blockage, and ensures the stability of the ash conveying system. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of a desulfurization digester dust removal system in an embodiment of the present utility model;

[0014] Figure 2 This is a top view of the digester body in the embodiment of the present utility model;

[0015] Among them: 10. Digester body; 11. Bag dust removal device; 12. Dust collector exhaust fan; 20. Fluidizing air duct; 21. Steam heater; 22. Steam inlet pipe; 23. Steam trap; 24. Dust removal branch pipe; 25. Dust removal branch pipe; 30. Fluidizing air branch pipe; 31. Buffer bin pump; 32. Air volume valve. DETAILED DESCRIPTION

[0016] like Figure 1As shown, this embodiment provides a desulfurization digester dust removal system with a fluidized air heating device, including a digester main body 10 with a bag dust removal device 11 arranged inside. The gas is transported back to the absorption tower through a dust collector exhaust fan 12 and a pipeline above the digester main body 10. The bottom of the digester main body 10 is provided with a multi-stage digester motor. The digester main body 10 is a conventional lime digester, so this embodiment does not elaborate on other additional accessories.

[0017] The desulfurization digester dust removal system in this embodiment also includes a fluidizing air duct 20 for providing fluidizing air. A fluidizing fan is installed on the fluidizing air duct 20. The fluidizing air duct 20 extends into the digester main body 10 toward the bag dust removal device 11. A steam heater 21 for heating the fluidizing air is provided on the fluidizing air duct 20. A steam inlet pipe 22 for providing steam is connected to the steam heater 21, and a steam trap 23 is also provided on the steam heater 21 to discharge condensed water generated after heat exchange. A fluidizing air branch pipe 30 is also connected to the fluidizing air duct 20. The other end of the fluidizing air branch pipe 30 is connected to a buffer bin pump 31. The buffer bin pump 31 is heated by the heated fluidizing air. An air volume valve 32 is provided on the fluidizing air branch pipe 30 to control the fluidizing air volume.

[0018] See also Figure 2 In this embodiment, the fluidizing air duct 20 extends into the digester main body 10 through a U-shaped dust removal branch duct 24. The opposite sides of the dust removal branch duct 24 are distributed on the front and rear sides of the digester main body 10. Specifically, the opposite sides of the dust removal branch duct 24 are connected with a plurality of dust removal branch pipes 25 extending into the digester main body 10, so that the dust removal branch pipes 25 can transport the fluidizing air after heat exchange from the front and rear sides to blow toward the bag dust removal device 11.

[0019] In some specific embodiments, the bag dust removal device 11 can be a number of bag dust collectors arranged in a row, and the front and rear sides of each bag dust collector correspond one-to-one to the dust removal branch pipes 25 on both sides. Specifically, it can be a filter (bag) for collecting dust, and the commonly used materials are polyester fiber, glass fiber, polypropylene, etc.

[0020] It should be noted that the traditional digester dust removal system operation method is prone to generate a large amount of water vapor (lime reacts with water to release a large amount of hot steam, and the high humidity of the steam will affect the service life of the bag. Secondly, dust hanging on the bag will cause the bag to stick), damaging the bag and reducing the service life of the dust collector exhaust fan 12. A large amount of steam condensate also poses a hidden danger to the bottom ash discharge system, affecting the normal ash discharge operation of the system; this embodiment is improved by using the fluidized air heated by the steam heater 21 to heat and fluidize the bag dust removal device 11 in the digester body 10, reducing the water vapor content and condensation phenomenon. On the other hand, the fluidized air after heat exchange is connected to the buffer bin pump 31 through a branch line. During the ash placement process, the fluidized air keeps the internal fluidization and heat preservation of the bin pump to reduce bin blockage.

[0021] In addition to the above embodiments, the present invention may also have other implementation methods; any technical solutions formed by equivalent replacement or equivalent transformation fall within the protection scope required by the present invention.

Claims

1. A desulfurization digester dust removal system with a fluidized air heating device, comprising a digester body (10) with a bag dust removal device (11) disposed therein, wherein the gas is transported back to an absorption tower via a dust collector exhaust fan (12) and a pipeline above the digester body (10), characterized in that: It also includes a fluidizing air duct (20) equipped with a fluidizing fan to provide fluidizing air, the fluidizing air duct (20) extending into the digester body (10) toward the bag dust removal device (11), wherein the fluidizing air duct (20) is provided with a steam heater (21) for heating the fluidizing air.

2. The desulfurization digester dust removal system according to claim 1, characterized in that: The fluidizing air duct (20) is further connected to a fluidizing air branch duct (30), and the other end of the fluidizing air branch duct (30) is connected to a buffer bin pump (31).

3. The desulfurization digester dust removal system according to claim 2, characterized in that: An air volume valve (32) is provided on the fluidizing air branch pipe (30).

4. The desulfurization digester dust removal system according to claim 1, characterized in that: The steam heater (21) is connected to a steam inlet pipe (22) for supplying steam, and the steam heater (21) is also provided with a steam trap (23).

5. The desulfurization digester dust removal system according to claim 1, characterized in that: The fluidizing air duct (20) extends into the digester body (10) through a U-shaped dust removal branch duct (24), and opposite sides of the dust removal branch duct (24) are distributed at the front and rear sides of the digester body (10).

6. The desulfurization digester dust removal system according to claim 5, characterized in that: A plurality of dust removal branch pipes (25) are connected to opposite sides of the dust removal branch pipe (24) and extend into the digester body (10).

7. The desulfurization digester dust removal system according to claim 6, characterized in that: The bag dust removal device (11) includes a plurality of bag dust collectors arranged in a row, and the front and rear sides of each bag dust collector correspond to the dust removal branch pipe (25).

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