Closed dust removal system
By adopting a closed dust removal system during the production of flake alkali, using molten salt fillers for heat exchange and dust recovery, the problem of difficult dust removal in high-temperature and high-pressure flue gas during the drying process is solved, and efficient heat recovery and dust removal effect is achieved.
Patent Information
- Application Number
- CN202422578709.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-24
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-10-24
AI Technical Summary
During the production process of flake alkali, the high-temperature and high-pressure flue gas generated in the drying stage contains dust, which is difficult to effectively remove dust. At the same time, the heat recovery rate is not high, and the existing dust removal system has the problem of difficulty in achieving efficient dust removal and heat recovery.
The closed dust removal system is adopted, and the molten salt filler is used as the heat transfer medium to exchange heat through the heat exchange pipe and the bent pipe, reduce the flue gas temperature, and perform preliminary dust recovery in the exhaust chamber to improve the dust removal effect.
It realizes efficient recovery of flue gas heat and effective dust removal, reduces flue gas temperature and dust volume, and improves the overall performance of the dust removal system.
Smart Images
Figure CN223026973U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of industrial environmental protection technologies, and in particular, to a closed dust removal system. Background Art
[0002] Sodium hydroxide can be produced by methods such as the brine method, the diaphragm method, and the ion exchange membrane method. After obtaining the concentrated alkali solution by these production methods, it is necessary to use a drying method to remove the moisture and impurities in the concentrated alkali solution to obtain a high-purity product. In the drying stage, the currently more commonly used method is the three-pot method, which can make relatively full use of the combustion heat.
[0003] The flue gas generated during the drying process contains a large amount of heat and also contains a certain amount of dust. It is necessary to further recover the heat and at the same time remove the dust in the flue gas. However, at this time, the flue gas temperature is high, and the use of bag dust removal is restricted. Centrifugal dust removal will also result in a low heat recovery rate due to long-term heat transfer. Of course, there have also been attempts to use a combined treatment method of atomization cooling and dust removal. However, at this time, the high-temperature and high-pressure mixed gas generated is doped with dust at the same time, and there are difficulties in separation. Summary of the Invention
[0004] This application provides a closed dust removal system, which uses molten salt filler to recover the heat in the flue gas, and while effectively reducing the flue gas temperature, it can also make the flue gas enter the dust removal system for dust removal treatment.
[0005] The above object of this application is achieved through the following technical solutions:
[0006] This application provides a closed dust removal system, including:
[0007] A box body, in which an air inlet chamber, a first heat exchange chamber, a heat exchange space, a second heat exchange chamber, and an exhaust chamber are sequentially arranged from top to bottom;
[0008] An air extraction device, connected to the air inlet chamber;
[0009] A dust removal module, connected to the exhaust chamber;
[0010] Heat exchange pipes, arranged in an array in the heat exchange space, and both ends of the heat exchange pipes are respectively connected to the air inlet chamber and the exhaust chamber;
[0011] Molten salt filler, arranged in the heat exchange space;
[0012] A heat exchange elbow, located in the heat exchange space and communicating with the second heat exchange chamber.
[0013] In a possible implementation manner of this application, the first end of the heat exchange elbow communicates with the second heat exchange chamber, and the second end bends toward the direction of the second heat exchange chamber.
[0014] In a possible implementation manner of the present application, the heat exchange elbow pipes are uniformly arranged in the heat exchange space.
[0015] In a possible implementation manner of the present application, heat dissipation fins are evenly distributed on the outer wall of the heat exchange pipeline.
[0016] In a possible implementation manner of the present application, the dust removal module is any one of a cyclone dust collector, a bag filter, and an electrostatic precipitator.
[0017] In a possible implementation manner of the present application, a recycler is arranged in the exhaust cavity, and the recycler is used to collect the aggregates on the bottom surface of the exhaust cavity.
[0018] In a possible implementation manner of the present application, in the direction close to the middle position of the bottom surface of the exhaust cavity, the height of the exhaust cavity tends to decrease.
[0019] In a possible implementation manner of the present application, the recycler includes a driver arranged on the box body and a scraper located in the exhaust cavity and connected to the driver.
[0020] The beneficial effects of the present application are as follows:
[0021] In the present application, molten salt is used as the heat transfer medium to recover the heat in the flue gas. This method does not generate high-temperature and high-pressure media, and the dust in the flue gas can also be preliminarily recovered in the exhaust cavity. The temperature and dust content of the treated flue gas are both reduced. At this time, it is sent to the dust collector for dust removal, and a better dust removal effect can be obtained. Brief Description of the Drawings
[0022] Figure 1 It is a schematic diagram of the flow path of the flue gas in a closed dust removal system provided by the present application.
[0023] Figure 2 It is a schematic diagram of the flow path of the heat exchange gas in a closed dust removal system provided by the present application.
[0024] Figure 3 It is a schematic diagram of the internal structure of a box body provided by the present application.
[0025] Figure 4 It is a cross-sectional schematic diagram of a heat exchange pipeline provided by the present application.
[0026] Figure 5 It is another schematic diagram of the internal structure of a box body provided by the present application.
[0027] In the figure, 1 is the box body, 2 is the air extraction device, 3 is the dust removal module, 4 is the heat exchange pipeline, 5 is the molten salt filler, 6 is the heat exchange elbow, 7 is the recycler, 11 is the air inlet chamber, 12 is the first heat exchange chamber, 13 is the heat exchange space, 14 is the second heat exchange chamber, 15 is the exhaust chamber, 41 is the heat dissipation fin, 71 is the driver, and 72 is the scraper. Detailed implementation mode
[0028] The following further elaborates on the technical solutions in this application with reference to the accompanying drawings.
[0029] This application discloses a closed dust removal system. In some examples, the closed dust removal system disclosed in this application includes a box body 1, an air extraction device 2, a dust removal module 3, a heat exchange pipeline 4, a molten salt filler 5, and a heat exchange elbow 6.
[0030] The flow direction of the flue gas is as Figure 1 shown by the arrow in the figure.
[0031] The flow direction of the heat exchange gas (low-temperature gas - high-temperature gas) is as Figure 2 shown by the arrow in the figure.
[0032] Please refer to Figure 3 , inside the box body 1, an air inlet chamber 11, a first heat exchange chamber 12, a heat exchange space 13, a second heat exchange chamber 14, and an exhaust chamber 15 are sequentially arranged from top to bottom. The heat exchange pipelines 4 are arranged in an array in the heat exchange space 13 and are respectively connected to the air inlet chamber 11 and the exhaust chamber 15 at both ends.
[0033] The top surface of the first heat exchange chamber 12 is a closed end, and the bottom surface of the first heat exchange chamber 12 is an open end. For example, a grille can be used.
[0034] The flue gas generated during the drying process first enters the air inlet chamber 11, then enters each heat exchange pipeline 4 through the air inlet chamber 11, enters the exhaust chamber 15 again, and finally enters the dust removal module 3 through the exhaust chamber 15. This process is the cooling process of the flue gas.
[0035] During the above process, the dust in the flue gas will impact the inner wall of the exhaust chamber 15, and part of the dust with large particle size will stay in the exhaust chamber 15. The flue gas in the heat exchange pipeline 4 flows from top to bottom and is not prone to blockage.
[0036] In some possible implementation manners, the heat exchange pipeline 4 uses a silicon carbide ceramic heat exchange pipe.
[0037] The air extraction device 2 is connected to the air inlet chamber 11, and its function is to send the flue gas into the air inlet chamber 11. Generally speaking, a fan is used for the air extraction device 2.
[0038] The dust removal module 3 is connected to the exhaust cavity 15, and its function is to remove dust from the flue gas. The dust removal module 3 can be any one of a cyclone dust collector, a bag filter, and an electrostatic precipitator.
[0039] The molten salt filler 5 is located in the heat exchange space 13 and serves as a heat transfer medium.
[0040] The heat exchange elbow 6 is located in the heat exchange space 13 and communicates with the second heat exchange cavity 14. After the low-temperature gas enters the heat exchange elbow 6 through the second heat exchange cavity 14, it will enter the interior of the molten salt filler 5 and exchange heat with the molten salt filler 5. During the heat exchange process, the low-temperature gas becomes a high-temperature gas, and the high-temperature gas enters the first heat exchange cavity 12 and then leaves the box body 1 through a pipeline.
[0041] This heat exchange process does not limit the flow range of the low-temperature gas, resulting in the low-temperature gas being able to fully exchange heat with the molten salt filler 5, effectively improving the transfer of the heat stored in the molten salt. Moreover, the molten salt remains solid during this process, does not generate high pressure, and does not require additional high-pressure protection measures.
[0042] In some examples, the first end of the heat exchange elbow 6 communicates with the second heat exchange cavity 14, and the second end bends towards the direction of the second heat exchange cavity 14, aiming to prevent the molten salt filler 5 from entering the heat exchange elbow 6.
[0043] In some possible implementation manners, the heat exchange elbows 6 are evenly arranged in the heat exchange space 13.
[0044] In some possible implementation manners, the heat exchange elbows 6 are evenly arranged around the heat exchange pipeline 4.
[0045] In some possible implementation manners, please refer to Figure 4 , heat dissipation fins 41 are evenly distributed on the outer wall of the heat exchange pipeline 4, and the heat dissipation fins 41 can increase the contact area and further improve the heat exchange effect.
[0046] In some examples, please refer to Figure 5 , a recycler 7 is arranged in the exhaust cavity 15. The recycler 7 is used to collect the aggregates on the bottom surface of the exhaust cavity 15. Here, the aggregates refer to the dust temporarily remaining in the exhaust cavity 15. The recycler 7 consists of a driver 71 installed on the box body 1 and a scraper 72 located in the exhaust cavity 15 and connected to the driver 71. The driver 71 drives the scraper 72 to rotate, gather the aggregates at the bottom of the exhaust cavity 15, and then recycle them through a pipeline.
[0047] Here, the driver 71 can be directly deployed inside the pipeline at the bottom of the exhaust cavity 15.
[0048] In some possible implementation manners, in the direction at the middle position near the bottom surface of the exhaust cavity 15, the height of the exhaust cavity 15 tends to decrease.
[0049] The embodiments of the specific implementation manners are all preferred embodiments of the present application, and do not limit the protection scope of the present application accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application shall be covered within the protection scope of the present application.
Claims
1. A closed dust removal system, characterized in that: include: A box body (1), wherein an air inlet chamber (11), a first heat exchange chamber (12), a heat exchange space (13), a second heat exchange chamber (14) and an exhaust chamber (15) are sequentially arranged in the box body (1) from top to bottom; An air extraction device (2) connected to the air inlet chamber (11); A dust removal module (3) connected to the exhaust chamber (15); Heat exchange pipes (4) are arranged in an array in the heat exchange space (13), and two ends of the heat exchange pipes (4) are respectively connected to the air inlet cavity (11) and the air outlet cavity (15); A molten salt filler (5) is arranged in the heat exchange space (13); The heat exchange elbow (6) is located in the heat exchange space (13) and is connected to the second heat exchange cavity (14).
2. The closed dust removal system according to claim 1, characterized in that: The first end of the heat exchange elbow (6) is in communication with the second heat exchange cavity (14), and the second end is bent in a direction toward the second heat exchange cavity (14).
3. The closed dust removal system according to claim 1 or 2, characterized in that: The heat exchange elbows (6) are evenly arranged in the heat exchange space (13).
4. The closed dust removal system according to claim 1, characterized in that: Heat dissipation fins (41) are evenly distributed on the outer wall of the heat exchange pipe (4).
5. The closed dust removal system according to claim 1, characterized in that: The dust removal module (3) is any one of a cyclone dust collector, a bag dust collector and an electrostatic precipitator.
6. The closed dust removal system according to claim 1, characterized in that: A collector (7) is provided in the exhaust cavity (15), and the collector (7) is used to collect aggregates on the bottom surface of the exhaust cavity (15).
7. The closed dust removal system according to claim 6, characterized in that: In a direction close to the middle position of the bottom surface of the exhaust cavity (15), the height of the exhaust cavity (15) tends to decrease.
8. The closed dust removal system according to claim 6, characterized in that: The recycler (7) comprises a driver (71) disposed on the housing (1) and a scraper (72) located in the exhaust chamber (15) and connected to the driver (71).