Bag-type dust collector applied to high-humidity gas
By setting up a flue gas preheating chamber in the bag dust collector and using a steam preheater to heat and dry the damp flue gas, and using PTFE coated filter bags, the problem of failure of conventional bag dust collectors in high humidity gas is solved, achieving efficient dust removal and cost reduction.
Patent Information
- Application Number
- CN202422242175.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-13
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-09-13
AI Technical Summary
Conventional bag dust collectors are prone to failure when dealing with high humidity gases, and the wet dust removal investment and operation costs are high, and the dust removal pipelines are prone to clogging.
The bag dust collector mode is arranged nearby. The flue gas preheating chamber is set up to increase the flue gas temperature to above the dew point, the PTFE coated filter bag is used, and the damp flue gas is heated through the steam preheater.
It effectively avoids dust scaling on the surface of the filter bag, maintains the air permeability of the filter bag, reduces dust removal costs, and avoids pipeline blockage.
Smart Images
Figure CN223026972U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of bag filters, and particularly relates to a bag filter applied to high-humidity gases. Background Technique
[0002] In industrial production, there are some materials with high moisture content due to the addition of water during production. For example, the steel slag in the steel industry is a by-product of steelmaking. When the high-temperature steel slag is produced, it is about 1000°C. To cool it to room temperature for subsequent treatment, the method of spraying water for cooling is often used. However, the cooled steel slag has a high moisture content. When using a conventional bag filter, dust is extremely easy to cake on the surface of the filter bag, affecting the air permeability of the bag and causing the bag filter to fail. Therefore, wet dust collectors are mostly selected for the dust generated during subsequent crushing and iron separation operations. Based on the environmental protection concept of zero emissions, the wet dust collector also needs to treat the wastewater and sludge generated therefrom, resulting in high investment and operating costs for the entire environmental protection dust removal.
[0003] Some materials with high moisture content need to be dried during application, such as iron oxide scale and filter press mud in steel mills. During the drying process, water vapor is generated along with dust. If the conventional bag is used and the pipeline path is long, the dust will also cake on the pipeline due to temperature drop, resulting in pipeline blockage and affecting the dust removal effect.
[0004] In view of the problems that the conventional bag is easy to fail when treating high-humidity gases, the investment and operating costs of wet dust removal are relatively high, and the dust removal pipeline is easy to block, a bag filter suitable for high-humidity gases is proposed. Content of the Utility Model
[0005] The purpose of the utility model is to provide a bag filter applied to high-humidity gases. The bag filter of the utility model adopts a nearby layout mode. Generally, one dust collector is set for one dust generation point to reduce pipelines. A flue gas preheating chamber is arranged in the air inlet chamber of the bag filter to raise the flue gas temperature above the dew point, which can effectively avoid dust scaling on the surface of the filter bag and maintain the air permeability of the filter bag. The filter bag inside the bag filter adopts a PTFE-coated filter bag, and the surface of the filter bag is smooth, which is convenient for dust cleaning, and solves the problem that water vapor is generated along with dust during the drying process of the existing dust collector. If the conventional bag is used and the pipeline path is long, the dust will also cake on the pipeline due to temperature drop, resulting in pipeline blockage and affecting the dust removal effect.
[0006] To solve the above technical problems, the utility model is realized through the following technical solutions:
[0007] The utility model relates to a bag filter applied to high-humidity gas, which comprises a preheater. A bag filter is fixedly connected to the top of the preheater. It is characterized in that a preheater is arranged at the air inlet of the bag filter, and a dust removal fan is arranged at the air outlet. The hot end of the preheater is connected with steam, and the cold end is connected with a steam condensate tank. A water pump is arranged at the condensate water outlet end of the steam condensate tank.
[0008] Furthermore, the preheater is arranged at the air inlet of the dust collector. The wet flue gas first passes through the preheater for heating and drying and then enters the bag filter. A plurality of filter bags are arranged inside the bag filter. The filter bags are made of PTFE coated film material. The clean flue gas filtered by the bag filter is discharged outside through the dust removal fan arranged at the air outlet.
[0009] Furthermore, the wet flue gas first passes through the preheater for heating and drying. The preheater uses saturated steam as a heat source. The wet flue gas and the steam exchange heat inside the preheater. After the temperature of the wet flue gas rises, it becomes unsaturated steam. After the steam releases heat, its temperature drops and it condenses into water and enters the steam condensate tank. A water pump is arranged at the outlet of the steam condensate tank to discharge and recycle the condensate water.
[0010] Furthermore, the water outlet pipe of the preheater is fixedly connected to the water inlet of the steam condensate tank through a pipeline, and the water outlet of the steam condensate tank is fixedly connected to the water inlet of the water pump through a pipeline.
[0011] The utility model has the following beneficial effects:
[0012] 1. The bag filter of the utility model adopts a nearby layout mode. Generally, one dust collector is set for one dust-producing point, reducing pipelines. A flue gas preheating chamber is arranged in the air inlet chamber of the bag filter to raise the temperature of the flue gas above the dew point, which can effectively prevent dust from scaling on the surface of the filter bag and maintain the air permeability of the filter bag. The filter bags inside the bag filter are PTFE coated film filter bags, and the surface of the filter bags is smooth, which is convenient for dust cleaning.
[0013] 2. The bag filter of the utility model uses steam for preheating. The steam can be the steam in the factory area or the waste steam generated during the production process. For example, a large amount of steam is released during the water spraying cooling of steel slag and the cooling of steel billets during casting. This part of steam is generally directly discharged, causing waste of heat and water. This part of heat can be used as the heat source for the preheating chamber of the dust collector.
[0014] Of course, it is not necessary for any product implementing the utility model to achieve all the above advantages simultaneously. Description of the Drawings
[0015] To more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0016] Figure 1 It is a schematic structural diagram of a bag filter for high-humidity gas of the present utility model.
[0017] In the drawings, the list of components represented by each reference numeral is as follows:
[0018] 1. Preheater; 2. Bag filter; 3. Dust removal fan; 4. Steam condensate tank; 5. Water pump. Specific embodiments
[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.
[0020] Please refer to Figure 1 As shown, the present utility model is a bag filter applied to high-humidity gas, including a preheater 1. The outlet of the preheater 1 is connected to the inlet of the bag filter 2. It is characterized in that: a dust removal fan 3 is arranged at the outlet of the bag filter 2, a steam condensate tank 4 is arranged at the cold end of the preheater 1, and a water pump 5 is arranged at the condensate outlet end of the steam condensate tank 4. The bag filter 2 adopts a nearby layout mode, generally setting one dust collector for one dust-producing point to reduce pipelines. A preheater 1 is arranged in the inlet chamber of the bag filter 2 to raise the flue gas temperature above the dew point, which can effectively avoid dust scaling on the surface of the filter bag and maintain the air permeability of the filter bag. The filter bag inside the bag filter 2 adopts a PTFE-coated filter bag, and the surface of the filter bag is smooth, which is convenient for ash cleaning.
[0021] The hot end of the preheater 1 is connected to the high-temperature steam pipe, and the cold end is connected to the low-temperature steam pipe. A plurality of filter bags are arranged inside the bag filter 2, and the filter bags adopt PTFE-coated materials. The bag filter 2 is preheated by steam, and the steam can be the plant steam or the waste steam generated during the production process. For example, a large amount of steam is released during the water spraying cooling of steel slag and the cooling of steel billets during casting. This part of the steam is generally directly discharged, resulting in waste of heat and water. This part of the heat can be used as the heat source for the preheating chamber of the dust collector.
[0022] The flue gas outlet of the bag filter 2 is connected to the dust removal fan 3. After the flue gas is heated by the heat source and the temperature rises above the dew point, it enters the bag filter 2. After being filtered by the bag filter 2, the clean flue gas is discharged outside through the dust removal fan 3.
[0023] The steam condensate tank 4 is connected to the air outlet end of the preheater 1. A water pump 5 is provided at the water outlet of the steam condensate tank 4. After the heat source exchanges heat with the low-temperature flue gas in the preheater 1, it condenses into water, and the condensed water is collected in the steam condensate tank 4.
[0024] The outlet pipe of the preheater 1 is fixedly connected to the inlet of the steam condensate tank 4 through a pipeline. The outlet of the steam condensate tank 4 is fixedly connected to the inlet of the water pump 5 through a pipeline. The condensed water in the steam condensate tank 4 returns to the softened water system through the water pump 5.
[0025] A specific application of this embodiment is as follows: A preheater 1 is provided at the inlet end of the dust collector. After the flue gas is heated by the heat source and the temperature rises above the dew point, it enters the bag filter 2. After being filtered by the bag filter 2, the clean flue gas is discharged outside through the dust removal fan 3. After the heat source exchanges heat with the low-temperature flue gas in the preheater 1, it condenses into water, and the condensed water is collected in the steam condensate tank 4 and returns to the softened water system through the water pump 5. This bag filter 2 breaks the conventional idea of centralized collection and treatment of dust collectors and adopts a layout mode of nearby arrangement. Generally, one bag filter 2 is set for one dust-producing point, reducing pipelines; A flue gas preheating chamber is provided in the inlet chamber of the bag filter 2 to raise the temperature of the flue gas above the dew point, which can effectively avoid the scaling of dust on the surface of the filter bag and maintain the air permeability of the filter bag; Steam preheating is adopted. The steam can be the steam in the factory area or the waste steam generated during the production process. For example, a large amount of steam will be released during the water spraying and cooling of steel slag and the cooling of steel billets during casting. This part of the steam is generally directly discharged, causing waste of heat and water. This part of the heat can be used as the heat source of the preheating chamber of the bag filter 2. The filter bags inside the bag filter 2 adopt PTFE coated filter bags, and the surface of the filter bags is smooth, which is convenient for dust cleaning.
[0026] In the description of this specification, the description with reference to terms such as "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.
[0027] The preferred embodiments of the present utility model disclosed above are only used to help illustrate the present utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the present utility model to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principle and practical application of the present utility model, so that those skilled in the relevant technical field can well understand and utilize the present utility model. The present utility model is only limited by the claims and their full scope and equivalents.
Claims
1. A bag filter for high-humidity gas, comprising a preheater (1), the top of which is fixedly connected to a bag filter (2), characterized in that: The bag filter (2) is provided with a preheater (1) at the air inlet and a dust removal fan (3) at the air outlet. The preheater (1) is connected to steam at its hot end and to a steam condensate tank (4) at its cold end. A water pump (5) is provided at the condensate outlet of the steam condensate tank (4).
2. The bag filter for high-humidity gas according to claim 1, characterized in that: The preheater (1) is arranged at the air inlet of the dust collector. The wet flue gas first passes through the preheater (1) for heating and drying before entering the bag dust collector (2). A plurality of filter bags are arranged inside the bag dust collector (2). The filter bags are made of PTFE film material. The clean flue gas filtered by the bag dust collector (2) is discharged through a dust removal fan (3) arranged at the air outlet.
3. The bag filter for high-humidity gas according to claim 2, characterized in that: The wet flue gas is first heated and dried in a preheater (1). The preheater (1) uses saturated steam as a heat source. The wet flue gas and the steam exchange heat in the preheater (1). After the temperature of the wet flue gas increases, it becomes unsaturated steam. After the steam releases heat, its temperature decreases and condenses into water, which enters a steam condensation water tank (4). A water pump (5) is provided at the outlet of the steam condensation water tank (4) to discharge the condensed water for reuse.
4. The bag filter for high-humidity gas according to claim 3, characterized in that: The water outlet pipe of the preheater (1) is fixedly connected to the water inlet of the steam condensate tank (4) through a pipeline, and the water outlet of the steam condensate tank (4) is fixedly connected to the water inlet of the water pump (5) through a pipeline.