Industrial silicon smelting flue gas purification treatment device

Abstract

The utility model discloses an industrial silicon smelting flue gas purification treatment device, which comprises a first filter unit, a second filter unit, a waste heat recovery device, a waste heat recovery device and a waste heat recovery device, the first reaction unit is used for receiving the flue gas which is output by the first filtering unit and is subjected to the first gas-solid filtering separation and adding a reactant into the flue gas which is subjected to the first gas-solid filtering separation, so that the reactant and the first gas-phase impurities are subjected to contact reaction; the first gas phase impurity is separated out in the form of a second solid phase impurity, and the reactant comprises a desulfurizing agent; and the second filtering unit is used for receiving the flue gas which is output by the first reaction unit and contains second solid phase impurities and carrying out second gas-solid filtering separation on the flue gas containing the second solid phase impurities, and an SCR denitration reaction unit is further arranged behind the second filtering unit. The risk of denitration catalyst poisoning caused by ammonium sulfate generated by reaction of sulfur dioxide and a denitration reducing agent is reduced.

Description

Technical Field

[0001] This disclosure relates to the field of flue gas purification technology. Specifically, the embodiments of this disclosure relate to dust collectors, methods for constructing dust collectors, flue gas purification systems, and industrial silicon smelting flue gas purification devices. Background Technology

[0002] Traditional industrial silicon smelting flue gas purification processes often employ a waste heat boiler combined with a baghouse dust collector. This involves first recovering heat from the industrial silicon smelting flue gas using a waste heat boiler to lower its temperature to within the design operating temperature range of the baghouse dust collector. The cooled flue gas is then passed into the baghouse dust collector for dust removal and purification. Since industrial silicon smelting flue gas contains sulfur dioxide and nitrogen oxides, desulfurization and / or denitrification are also necessary. Currently, a commonly used process route is: waste heat boiler → (dry) desulfurization unit → baghouse dust collector → (low-temperature) SCR denitrification reactor.

[0003] With the technological development and evolution of industrial silicon smelting flue gas purification processes, the applicant has proposed a series of improvement schemes. Firstly, a system for treating industrial silicon smelting flue gas is provided in patent document CN218034491U (Reference 1). Reference 1 (see appendix to the specification) Figure 5 The industrial silicon smelting flue gas treatment system (and related explanations) includes a first waste heat boiler unit, a flue gas filter dust collector unit, an SCR denitrification reactor unit, a second waste heat boiler unit, and a desulfurization device arranged in sequence. The first waste heat boiler unit and the second waste heat boiler unit form an integrated heat exchange device, and the SCR denitrification reactor unit and the flue gas filter dust collector unit form an integrated dust removal and denitrification device.

[0004] For the industrial silicon smelting flue gas treatment system in Reference Document 1, since the desulfurization device is located at the end of the system, it is not only prone to problems such as acid condensation and corrosion of the equipment due to the low flue gas temperature, but also the fact that the desulfurization device usually adopts wet desulfurization technology (mainly because dry desulfurization has certain requirements for flue gas temperature and setting dry desulfurization at the end of the system leads to excessive dust emissions), which increases the difficulty of treating desulfurization products.

[0005] To address the aforementioned issues, the applicant provided an improved industrial silicon smelting flue gas treatment system in patent document CN218011732U (Reference 2). Specifically, Reference 2 (see appendix to the specification) Figure 12 The industrial silicon smelting flue gas treatment system (and related instructions) has adjusted the location of the desulfurization device, placing it between the first waste heat boiler unit and the flue gas filter dust collector unit, and requiring that sulfur in the gas phase be removed in the form of a solid phase or carrier during desulfurization.

[0006] Regarding the industrial silicon smelting flue gas treatment system in Reference Document 2, although it overcomes the problems of acid condensation and wet desulfurization, there is a problem that the dust intercepted by the flue gas filtration and dust removal unit contains both microsilica powder and desulfurizing agent, as well as sulfur (such as sulfate) recovered through the desulfurizing agent, which makes it difficult to recycle and utilize the dust.

[0007] To further optimize the performance of the industrial silicon smelting flue gas treatment system, the applicant provided a new improvement scheme in patent document CN221815756U (Reference 3). Specifically, Reference 3 (see appendix to the specification) Figure 1 The industrial silicon smelting flue gas treatment system (and related explanations) has arranged the desulfurization device between the SCR denitrification reactor unit and the second waste heat boiler unit, and added a second flue gas filter dust collector unit between the desulfurization device and the second waste heat boiler unit.

[0008] For the industrial silicon smelting flue gas treatment system in Reference Document 3, it can avoid the contamination of microsilica powder with desulfurizing agent and sulfur (e.g., sulfate) recovered through the desulfurizing agent, while also recovering the desulfurizing agent before the second waste heat boiler unit. The industrial silicon smelting flue gas treatment system in Reference Document 3 requires the addition of a second flue gas filtration and dust removal unit, leading to increased construction and operating costs. Furthermore, the process in Reference Document 3 is: first flue gas filtration and dust removal unit → SCR denitrification unit → desulfurization unit → first flue gas filtration and dust removal unit. Because the sulfur content in the industrial silicon smelting flue gas is high during SCR denitrification, sulfur dioxide easily reacts with the denitrification reducing agent (usually ammonia) to form ammonium sulfate, thus causing poisoning of the denitrification catalyst.

[0009] In conclusion, although the applicant has continuously improved the setup of the desulfurization device in the industrial silicon smelting flue gas treatment system, there is still room for further optimization and improvement.

[0010] It is worth noting that many currently operating industrial silicon projects still largely employ the aforementioned traditional industrial silicon smelting flue gas purification processes. These industrial silicon projects have already made significant investments in baghouse dust collectors. Utility Model Content

[0011] Against this backdrop, the inventors proposed a technical approach to develop an industrial silicon smelting flue gas treatment system that can fully utilize existing baghouse dust collectors (which can be modified based on existing baghouse dust collectors) and further optimize the desulfurization device setup. Based on this technical approach, the present disclosure proposes the following technical solutions. Although these technical solutions are based on the above technical approach, they each address specific technical problems and produce different technical effects.

[0012] In a first aspect, a dust collector is provided for stepwise removal of a first solid phase impurity and a first gaseous phase impurity from a flue gas to be treated, and then outputting the treated flue gas; it includes: a dust collector housing; an inlet structure disposed in the dust collector housing and used to input the flue gas to be treated; an exhaust structure disposed in the dust collector housing and used to output the treated flue gas; an internal partition system disposed in the dust collector housing and used to divide the dust collector housing into required compartments; the internal partition system divides the dust collector housing into a first dust removal compartment, a first reaction compartment, and a second dust removal compartment; the first dust removal compartment is provided with a first filter structure to form a first filter unit, the first filter unit being used to achieve first gas-solid filtration separation and recover the first solid phase impurity; the first... A reaction compartment is provided with a reactant adding structure to form a first reaction unit. The reactant adding structure is used to add reactant to the first reaction unit. The reactant reacts with a first gaseous impurity, causing the first gaseous impurity to precipitate as a second solid impurity. A second dust removal compartment is provided with a second filtration structure to form a second filtration unit. The second filtration unit is used to achieve second gas-solid filtration separation and recover the second solid impurity. The flue gas inlet of the first filtration unit is connected to the air inlet structure, the flue gas inlet of the first reaction unit is connected to the flue gas outlet of the first filtration unit, the flue gas outlet of the first reaction unit is connected to the flue gas inlet of the second filtration unit, and the flue gas outlet of the second filtration unit is connected to the exhaust structure. The flue gas to be treated can be industrial silicon smelting flue gas. Therefore, the first solid impurity may contain microsilica powder, the first gaseous impurity may contain sulfur dioxide, and the reactant includes a desulfurizing agent.

[0013] Secondly, a flue gas purification system is provided, including a dust collector, wherein the dust collector adopts the dust collector described in the first aspect above.

[0014] Thirdly, a method for constructing a dust collector is provided, which involves modifying the dust collector housing of an existing dust collector to obtain the dust collector described in the first aspect.

[0015] The first aspect of the dust collector achieves a step-by-step treatment process by constructing a first dust collection compartment, a first reaction compartment, and a second dust collection compartment within the dust collector housing. This process involves first removing the first solid-phase impurities (such as microsilica), then reacting the first gaseous-phase impurities (such as sulfur dioxide) with a reactant to generate a second solid-phase impurity, and finally removing the second solid-phase impurity. Furthermore, this step-by-step treatment is completed within a single dust collector housing, significantly reducing the construction and operating costs and land area required for the second aspect of the flue gas purification system. The construction method of the third aspect of the dust collector can significantly reduce retrofitting costs.

[0016] Fourthly, an industrial silicon smelting flue gas purification and treatment device is provided, comprising: a first filtration unit for receiving the flue gas to be treated output from a waste heat recovery device, performing a first gas-solid filtration separation on the flue gas to be treated, and recovering a first solid phase impurity; the waste heat recovery device is used to receive the industrial silicon furnace smelting flue gas emitted from the industrial silicon smelting furnace and, after performing the first waste heat recovery utilization, output cooled flue gas with a temperature reduced to 180℃-450℃; the first cooled flue gas is the flue gas to be treated and contains a first solid phase impurity and a first gas phase impurity; the first solid phase impurity mainly comprises microsilica powder, and the first gas phase impurity mainly comprises sulfur dioxide; and a first reaction unit for receiving the flue gas output from the first filtration unit after the first gas-solid filtration separation and reacting it with the first gas-solid... A reactant is added to the filtered flue gas to allow it to react with the first gaseous impurity, causing the first gaseous impurity to precipitate as a second solid impurity. The reactant includes a desulfurizing agent. A second filtration unit is used to receive the flue gas containing the second solid impurity from the first filtration unit and perform a second gas-solid filtration separation on the flue gas containing the second solid impurity. An SCR denitrification reaction unit is also provided after the second filtration unit. The temperature of the flue gas output from the second filtration unit after the second gas-solid filtration separation can meet the requirements of the SCR denitrification reaction unit. The SCR denitrification reaction unit is used to receive the flue gas output from the second filtration unit with added SCR denitrification reducing agent and output denitrified flue gas after passing through the SCR denitrification catalyst.

[0017] The industrial silicon smelting flue gas purification device of the fourth aspect mentioned above can adopt the dust collector of the first aspect mentioned above. In this case, the dust collector includes a dust collector housing and an air inlet structure and an exhaust structure disposed within the dust collector housing; the dust collector housing is provided with an internal partition system, which divides the dust collector housing into a first dust removal compartment, a first reaction compartment, and a second dust removal compartment; the first dust removal compartment is provided with a first filter structure to form a first filter unit, which is used to achieve first gas-solid filtration separation and recover the first solid phase impurities; the first reaction compartment is provided with a reactant addition structure to form a first reaction unit, which is used to add reactant to the first reaction unit. The reactant is used to react with the first gaseous impurity, thereby causing the first gaseous impurity to precipitate as a second solid impurity; the second dust removal compartment is provided with a second filtration structure to form the second filtration unit, which is used to achieve second gas-solid filtration separation and recover the second solid impurity; the flue gas inlet of the first filtration unit is connected to the air inlet structure, the flue gas inlet of the first reaction unit is connected to the flue gas outlet of the first filtration unit, the flue gas outlet of the first reaction unit is connected to the flue gas inlet of the second filtration unit, and the flue gas outlet of the second filtration unit is connected to the exhaust structure.

[0018] The fourth aspect of the industrial silicon smelting flue gas purification and treatment device can realize the industrial silicon smelting flue gas purification process of waste heat recovery device → first filtration unit → first reaction unit (desulfurization) → second filtration unit → SCR denitrification reaction unit. In this industrial silicon smelting flue gas purification process, desulfurization is located before SCR denitrification, which significantly reduces the risk of sulfur dioxide in industrial silicon smelting flue gas reacting with denitrification reducing agent to generate ammonium sulfate and causing denitrification catalyst poisoning.

[0019] Fifthly, a dust collector is provided, comprising: a dust collector housing; an inlet structure disposed within the dust collector housing for inputting flue gas to be treated; an exhaust structure disposed within the dust collector housing for outputting treated flue gas; and an internal partition system disposed within the dust collector housing for dividing the dust collector housing into required compartments; wherein the internal partition system divides the dust collector housing into vertical compartments arranged in a grid pattern on a horizontal plane; a filter structure is provided in a vertical compartment located in a portion of the dust collector housing to form a filter unit, the filter unit being used to achieve gas-solid filtration separation of the flue gas to be treated, the gas-solid filtration separation being a first treatment; a filter function extension structure is provided in a vertical compartment located in another portion of the dust collector housing to form a filter function extension unit, the filter function extension unit being used to achieve a second treatment of the flue gas to be treated; the flue gas to be treated becomes the treated flue gas after passing through the first treatment and the second treatment and is discharged from the dust collector housing through the exhaust structure, the second treatment being located before or after the first treatment.

[0020] The filtration function extension structure can be a reactant addition structure, a temperature regulation structure, or a gravity sedimentation structure; the reactant addition structure is used to add a reactant to the flue gas to be treated, and the reactant is used to react with the target substance in the flue gas to remove the target substance from the flue gas.

[0021] In a sixth aspect, a flue gas purification system is provided, including a dust collector, wherein the dust collector adopts the dust collector described in the fifth aspect above.

[0022] The fifth aspect of the dust collector adopts a grid-like vertical compartment layout, which flexibly realizes multiple treatment functions for the flue gas to be treated by setting up filtration units and filtration function extension units in different areas.

[0023] The present disclosure will now be further described in conjunction with the accompanying drawings and specific embodiments. Additional aspects and advantages of the present disclosure will be set forth in part in the description which follows, and in part will be obvious from the description or may be learned by practice. Attached Figure Description

[0024] The accompanying drawings, which form part of this specification, are used to aid in understanding this disclosure. The contents provided in the drawings and their related descriptions in this specification may be used to interpret this disclosure, but do not constitute an undue limitation of this disclosure.

[0025] Figure 1 This is a schematic diagram of the external shape of a bag filter used in the traditional industrial silicon smelting flue gas purification process.

[0026] Figure 2 for Figure 1 The image shows a cross-sectional view of one of the vertical compartments of a bag filter.

[0027] Figure 3 for Figure 1 The image shows a cross-sectional view of the transverse flue of a bag filter.

[0028] Figure 4 for Figure 1 The image shows a transparent view of the transverse flue of a bag filter.

[0029] Figure 5 This is a transparent view of one side of the transverse flue of the dust collector according to Embodiment 1 of this disclosure.

[0030] Figure 6 This is a transparent view of the other side of the transverse flue of the dust collector according to Embodiment 1 of this disclosure.

[0031] Figure 7 This is a transparent view of the dust collector as described in Embodiment 1 of this disclosure.

[0032] Figure 8 This is a transparent view of the dust collector according to Embodiment 1 of this disclosure from another angle.

[0033] Figure 9 for Figure 8 Sectional view along line AA.

[0034] Figure 10 for Figure 8 Sectional view along the BB direction.

[0035] Figure 11 This is a schematic diagram of the dust collector according to Embodiment 2 of this disclosure.

[0036] Figure 12 This is a schematic diagram of the horizontal layout of the internal structure of the dust collector according to Embodiment 2 of this disclosure.

[0037] Figure 13 This is a schematic diagram of the dust collector according to Embodiment 3 of this disclosure.

[0038] Figure 14 This is a schematic diagram of the dust collector according to Embodiment 4 of this disclosure.

[0039] Figure 15 This is a schematic diagram of the horizontal layout of the internal structure of the dust collector according to Embodiment 4 of this disclosure.

[0040] Figure 16 for Figure 15 Sectional view along line AA. Detailed Implementation

[0041] The present disclosure will now be clearly and completely described in conjunction with the accompanying drawings. Those skilled in the art will be able to implement the present disclosure based on these descriptions. Before describing the present disclosure in conjunction with the accompanying drawings, it should be particularly noted that:

[0042] The technical solutions and features provided in the various sections, including the following description, can be combined with each other without conflict. Furthermore, where possible, these technical solutions, features, and related combinations can be given specific technical subject matter and protected by relevant patents.

[0043] The embodiments described below are generally only some embodiments and not all embodiments. All other embodiments obtained by those skilled in the art based on these embodiments without inventive effort should fall within the scope of patent protection.

[0044] Regarding the terminology and units in this specification: The terms "comprising," "including," "having," and any variations thereof in this specification, the corresponding claims, and related sections are intended to cover non-exclusive inclusion. Furthermore, other related terms and units can be reasonably interpreted based on the relevant content provided in this specification.

[0045] Figure 1 This is a schematic diagram of the external shape of a bag filter used in the traditional industrial silicon smelting flue gas purification process. Figure 2 for Figure 1 The image shows a cross-sectional view of one of the vertical compartments of a bag filter. Figure 3 for Figure 1 The image shows a cross-sectional view of the transverse flue of a bag filter. Figure 4 for Figure 1 A transparent view of the transverse flue of a bag filter dust collector is shown. Figures 1-4 As shown, the bag filter includes: a dust collector housing 1; an air inlet structure 2, which is disposed in the dust collector housing 1 and used to input the flue gas to be treated; an exhaust structure 3, which is disposed in the dust collector housing 1 and used to output the treated flue gas; and an internal partition system 4, which is disposed in the dust collector housing 1 and used to divide the dust collector housing 1 into the required compartments.

[0046] Specifically, the internal partition system 4 divides the dust collector housing 1 into vertical compartments 11 arranged in a grid pattern on the horizontal plane (for an understanding of "vertical compartments arranged in a grid pattern on the horizontal plane", please refer to the appendix to the specification of patent document with publication number CN214182230U). Figure 1-3 Each vertical compartment 11 is equipped with a lower compartment (original air compartment) and an upper compartment (clean air compartment). A bag-mounting structure (usually a perforated plate) is provided between the lower compartment and the upper compartment. Bags 5 extending into the lower compartment are arranged and installed on the bag-mounting structure. Each vertical compartment 11 has an ash hopper 13 at its bottom, and each ash hopper 13 has an ash discharge device at its bottom. In addition, the dust collector housing 1 is also equipped with a transverse flue 12 that runs horizontally between the vertical compartments, which is used to connect the air intake structure 2 to the lower compartment of each vertical compartment 11 and to connect the exhaust structure 3 to the upper compartment of each vertical compartment 11.

[0047] Typically, the dust collector housing 1 is a rectangular housing in the horizontal plane, and the internal partition system divides the rectangular housing into rectangular vertical compartments 11 arranged in a grid pattern in the horizontal plane. These vertical compartments are arranged in the following manner in the horizontal Y-axis direction (see...). Figure 2 Two rows of vertical compartments are formed on the surface, each row of vertical compartments having a horizontal X-axis direction (see...). Figure 2 The vertical compartments (specifically 10) are arranged in a row. The transverse flue 12 is located between these two rows of vertical compartments.

[0048] Typically, the transverse flue 12 is equipped with an inclined baffle 14, which divides the main flue of the transverse flue 12 into an upper transverse flue and a lower transverse flue. The lower transverse flue is connected to the air inlet of the air intake structure 2, and the upper transverse flue is connected to the exhaust outlet of the exhaust structure 3. Additionally, from... Figure 3 As can be seen, the inclined baffle 14 causes the cross-sectional area of ​​the lower transverse flue to gradually decrease from the air inlet of the air intake structure 2 to the exhaust outlet of the exhaust structure 3, and causes the cross-sectional area of ​​the upper transverse flue to gradually increase from the air inlet of the air intake structure 2 to the exhaust outlet of the exhaust structure 3.

[0049] In addition, a dedicated air guiding structure is provided at the top of the upper transverse flue, allowing the upper compartments of each vertical chamber 11 to be connected to the upper transverse flue through independent clean air channels. Each clean air channel is controlled by a corresponding lift valve 6. Furthermore, a dedicated air guiding structure 21 is provided at the bottom of the lower transverse flue, allowing the lower compartments of each vertical chamber 11 to be connected to the lower transverse flue through independent raw air channels (the air guiding structure 21 is generally connected between the lower transverse flue and each ash hopper 13). Each raw air channel can also be controlled by a corresponding valve (not shown in the figure).

[0050] Patent document CN214182230U describes a bag filter similar to the aforementioned bag filter, and this patent document can be used to aid in understanding the working principle of the bag filter structure. Combined with... Figures 1-4 The working principle of this type of bag filter is as follows: the flue gas to be treated enters the lower horizontal flue through the air inlet of the air inlet structure 2, and enters the lower compartment of each vertical compartment 11 through the raw gas channel between the lower horizontal flue and the lower compartment of each vertical compartment 11. It is then cleaned by the filter bag 5. The cleaned flue gas enters the upper compartment of each vertical compartment 11, and then enters the upper horizontal flue through the corresponding clean gas channel. Finally, it flows out from the exhaust port of the exhaust structure 3.

[0051] An existing industrial silicon smelting flue gas purification process utilizes the aforementioned baghouse dust collector. This process employs a waste heat boiler combined with a baghouse dust collector, specifically following the following route: waste heat boiler → (dry) desulfurization unit → baghouse dust collector → (low-temperature) SCR denitrification reactor → fan → chimney. The main problems with this industrial silicon smelting flue gas purification process are: First, the denitrification efficiency of low-temperature SCR denitrification is low, limited by the relatively low temperature limit of the baghouse dust collector, and medium-to-high temperature SCR denitrification cannot be used. Second, the dust intercepted by the baghouse dust collector contains both microsilica powder and desulfurizing agents, as well as sulfur (e.g., sulfates) recovered through the desulfurizing agents, making the recycling of this dust difficult.

[0052] This embodiment modifies the above-mentioned industrial silicon smelting flue gas purification process. The modification scheme is as follows: the above-mentioned bag filter is modified into a high-temperature flue gas filtration dust collector (modified on the dust collector housing of the bag filter), and then the industrial silicon smelting flue gas purification process is adjusted accordingly.

[0053] Figure 5 This is a transparent view of one side of the transverse flue of the dust collector according to Embodiment 1 of this disclosure. Figure 6 This is a transparent view of the other side of the transverse flue of the dust collector according to Embodiment 1 of this disclosure. Figure 7 This is a transparent view of the dust collector as described in Embodiment 1 of this disclosure. Figure 8 This is a transparent view of the dust collector according to Embodiment 1 of this disclosure from another angle. Figure 9 for Figure 8 Sectional view along line AA. Figure 10 for Figure 8 Sectional view along the BB direction. (See below for reference.) Figures 5-10 The specific renovation plan is described below.

[0054] First, the horizontal flue 12 needs to be modified. For example... Figures 5-6As shown, based on the existing transverse flue 12 structure, a longitudinal baffle 15 is first added to the transverse flue 12. The longitudinal baffle 15 and the inclined baffle 14 are arranged intersectingly to divide the main flue of the transverse flue 12 into four flues, namely the first intake flue 121, the first exhaust flue 122, the second intake flue 123, and the second exhaust flue 124. Then, a first baffle 16 is set in the intake port of the intake structure 2 to separate the second intake flue 123 from the intake port of the intake structure 2. In addition, a second baffle 17 is set in the exhaust port of the exhaust structure 3 to separate the first exhaust flue 122 from the exhaust port of the exhaust structure 3. Finally, a third baffle 18 is inserted in the first intake flue 121 near the exhaust port of the exhaust structure 3 to close the end of the first exhaust flue 122, and an opening 19 is reserved on the longitudinal baffle 15 in the area below the inclined baffle 14 between the third baffle 18 and the exhaust port of the exhaust structure 3. Note that the position of the third baffle 18 should be such that the flue gas to be treated entering the first intake flue 121 from the intake port of the intake structure 2 cannot directly enter the last two vertical compartments 11 (as the first reaction compartment 11a) in the row of vertical compartments 11 on the left side of the first intake flue 121.

[0055] Secondly, the last two vertical compartments 11 (serving as the first reaction compartment 11a) on the left side of the first intake flue 121 / first exhaust flue 122 are modified. For example... Figures 7-8 As shown, the filter bags in the last two vertical compartments 11 (serving as the first reaction compartment 11a) on the left side of the first intake flue 121 / first exhaust flue 122 are all removed, and the filter bag mounting structure (orifice plate) is also disassembled, thus forming a cavity in these two vertical compartments 11. Furthermore, a reactant adding structure is installed in this cavity. This reactant adding structure is used to add reactant into the cavity, and the reactant reacts with the first gaseous impurity, causing the first gaseous impurity to precipitate as a second solid impurity. When the flue gas to be treated is industrial silicon smelting flue gas, the first gaseous impurity mainly contains sulfur dioxide, and the reactant includes a desulfurizing agent. The reactant adding structure may include a reactant adding pipe inserted into the cavity (…). Figures 5-10 (Not shown in the image). Finally, ventilation holes 20 are opened on the side wall of the last two vertical compartments 11 (as the first reaction compartment 11a) on the left side of the first intake flue 121 / first exhaust flue 122, which are separated from the first exhaust flue 122 (here, "louvered" ventilation holes are used to improve the uniformity of airflow).

[0056] Finally, all the filter bags in the remaining vertical compartments 11 are replaced with metal or ceramic filter elements. In this embodiment, the metal membrane filter element developed and manufactured by the applicant is specifically used. Since the length of the metal membrane filter element is currently shorter than that of the filter bag, the height of the filter bag mounting structure (perforated plate) can be lowered by a certain distance, depending on the length specifications of the selected metal membrane filter element.

[0057] Through the above modifications, the dust collector of Embodiment 1 of this disclosure is obtained. It includes: a dust collector housing 1; an air inlet structure 2, disposed within the dust collector housing 1 and used to input the flue gas to be treated; an exhaust structure 3, disposed within the dust collector housing 1 and used to output the treated flue gas; and an internal partition system 4, disposed within the dust collector housing 1 and used to divide the dust collector housing 1 into required compartments; wherein, the internal partition system 4 divides the dust collector housing 1 to form a first dust collection compartment, a first reaction compartment 11a, and a second dust collection compartment; the first dust collection compartment is provided with a first filter structure to form a first filter unit, the first filter unit being used to achieve first gas-solid filtration separation and recover the first solid phase impurities; the first reaction compartment is provided with a reactant addition structure to form a first reaction unit. The reactant addition structure is used to add reactant to the first reaction unit, and the reactant is used to react with the first gaseous impurity to precipitate the first gaseous impurity as a second solid impurity; the second dust removal compartment is provided with a second filtration structure to form a second filtration unit, and the second filtration unit is used to achieve second gas-solid filtration separation and recover the second solid impurity; wherein, the flue gas inlet of the first filtration unit is connected to the air inlet structure 2, the flue gas inlet of the first reaction unit is connected to the flue gas outlet of the first filtration unit, the flue gas outlet of the first reaction unit is connected to the flue gas inlet of the second filtration unit, and the flue gas outlet of the second filtration unit is connected to the exhaust structure 3.

[0058] Specifically, the flue gas to be treated is industrial silicon smelting flue gas, the first solid phase impurity mainly contains microsilica powder, the first gas phase impurity mainly contains sulfur dioxide, and the reactant includes a desulfurizing agent.

[0059] More specifically, the internal partition system 4 divides the dust collector housing 1 into vertical compartments 11 arranged in a grid pattern on a horizontal plane. The dust collector housing 1 is provided with transverse flues 12 that connect the vertical compartments 11. These transverse flues include a first intake flue 121, a first exhaust flue 122, a second intake flue 123, and a second exhaust flue 124. Multiple vertical compartments located in the first region of the dust collector housing 1 (i.e., the remaining two vertical compartments 11 in a row to the left of the first intake flue 121 / first exhaust flue 122) each constitute an independent first dust collector. The dust collector housing 1 has several vertical compartments located in the second region (i.e., a row of vertical compartments 11 on the right side of the second inlet flue 123 / second exhaust flue 124), each forming an independent second dust collection compartment. The first reaction compartment 11a (i.e., the last two vertical compartments 11 in a row of vertical compartments 11 on the left side of the first inlet flue 121 / first exhaust flue 122) is located in the third region of the dust collector housing 1. Each first dust collection compartment is provided with a first lower compartment and a first upper compartment. A first filter element mounting structure is provided between the first lower compartment and the first upper compartment. The first filter element mounting structure is used to install filters that extend into the first filter element. The first filter element (specifically a metal membrane filter element) in the lower compartment is used to trap the first solid phase impurities in the first lower compartment; each second dust removal compartment is provided with a second lower compartment and a second upper compartment, and a second filter element mounting structure is provided between the second lower compartment and the second upper compartment. The second filter element mounting structure is used to install a second filter element (specifically a metal membrane filter element) extending into the second lower compartment, and the second filter element is used to trap the second solid phase impurities in the second lower compartment; the first air inlet flue 121 is simultaneously connected to the flue gas inlet of each first lower compartment, and the first... The air intake end of the first air intake flue 121 constitutes the air intake port of the air intake structure 2. The first exhaust flue 122 is simultaneously connected to the flue gas outlet of each of the first upper compartments. The exhaust end of the first exhaust flue 122 is connected to the flue gas inlet of the first reaction unit (through the vent 20). The second air intake flue 123 is simultaneously connected to the flue gas inlet of each of the second lower compartments. The air intake end of the second air intake flue 123 is connected to the flue gas outlet of the first reaction unit. The second exhaust flue 124 is simultaneously connected to the flue gas outlet of each of the second upper compartments. The exhaust end of the second exhaust flue 124 constitutes the exhaust port of the exhaust structure 3.

[0060] More specifically, the dust collector housing 1 is a rectangular housing on the horizontal plane, and the internal partition system 4 divides the rectangular housing into rectangular vertical compartments arranged in a grid pattern on the horizontal plane; the first region constitutes the first side of the rectangular housing, the second region constitutes the second side of the rectangular housing, and the first side and the second side are opposite sides; the third region constitutes the third side of the rectangular housing, and the third side is the side adjacent to the first side.

[0061] More specifically, the vertical compartments located in the first region and the vertical compartments located in the second region are arranged in the horizontal plane as follows: two rows of vertical compartments are formed in the horizontal Y-axis direction, and each row of vertical compartments has multiple vertical compartments arranged in the horizontal X-axis direction; the main flue of the transverse flue 12, which is composed of the first air intake flue, the first exhaust flue, the second air intake flue, and the second exhaust flue, is arranged between the two rows of vertical compartments; the first region and the second region are distributed on the left and right sides of the main flue.

[0062] like Figures 9-10 As shown (the arrows in the figure indicate the direction of flue gas flow), the working principle of the dust collector in Embodiment 1 of this disclosure is as follows: The flue gas to be treated (industrial silicon smelting flue gas) first enters the first inlet flue 121, and then enters each of the first dust removal compartments (first filter units) through the corresponding air guiding structures 21. Then, it undergoes first gas-solid filtration separation through the first filter element and recovers the first solid phase impurities (micro silica powder). The third baffle 18 prevents the flue gas to be treated from the first inlet flue 121 of the inlet structure from directly entering the last two vertical compartments 11 (as the first reaction compartment 11a) in the row of vertical compartments 11 on the left side of the first inlet flue 121. After passing through the first gas-solid filtration separation, the flue gas enters the first exhaust flue 122. Since a second baffle 17 is provided in the exhaust port of the exhaust structure 3, the first exhaust flue 122 is separated from the exhaust port of the exhaust structure 3. At the same time, the lift valve corresponding to the first reaction compartment 11a is also closed. At this time, the flue gas in the first exhaust flue 122 can only enter the first reaction compartment 11a (first reaction unit) through the ventilation hole 20 opened on the side wall separating the first reaction compartment 11a from the first exhaust flue 122. The first reaction unit receives the flue gas after passing through the first gas-solid filtration separation output by the first filtration unit and adds a reactant (including a desulfurizing agent) to the flue gas after passing through the first gas-solid filtration separation, so that the reactant reacts with sulfur dioxide, thereby causing sulfur dioxide to precipitate out as a second solid phase impurity (if the desulfurizing agent is a calcium-based desulfurizing agent, then the second solid phase impurity is calcium sulfate). The flue gas containing the second solid phase impurities then enters the second inlet flue duct 123 through the air guide structure 21 of the first reaction compartment 11a, and is subsequently subjected to second gas-solid filtration separation by each of the second dust removal compartments (second filter units). Finally, the treated flue gas is discharged from the exhaust port of the exhaust structure 3.

[0063] An industrial silicon smelting flue gas purification process utilizes the dust collector described in Example 1. The specific process route is as follows: First waste heat boiler unit (outputting flue gas with a temperature of 300℃-450℃) → Dust collector → SCR denitrification reactor unit → Second waste heat boiler unit → Fan → Chimney.

[0064] The dust collector of Embodiment 1 of this disclosure can not only recover microsilica powder separately, but also, since all the filter bags are replaced with metal membrane filter elements, the temperature of the treated flue gas can be significantly increased. In this way, the subsequent SCR denitrification reactor unit can achieve medium and high temperature SCR denitrification, thereby improving the denitrification efficiency.

[0065] It should be noted that the dust collector in Embodiment 1 of this disclosure is a modified two-stage dust collector connected in series, based on a conventional bag filter. This inevitably leads to an increase in the filtration velocity of each stage (the two-stage dust collector in series results in an increase in the airflow per unit area). Metal or ceramic filter elements are well-suited to higher filtration velocities (their high structural strength allows them to withstand larger filtration velocities and maintain stable filtration efficiency even at high velocities), thus allowing the advantages of metal or ceramic filter elements to be fully utilized. During operation of the dust collector in Embodiment 1 of this disclosure, the filtration velocities of the first and second filtration units can typically be set to 0.8 m / min-1.5 m / min.

[0066] Figure 11 This is a schematic diagram of the dust collector according to Embodiment 2 of this disclosure. Figure 12 This is a schematic diagram of the horizontal layout of the internal structure of the dust collector according to Embodiment 2 of this disclosure. Figures 11-12 As shown, the dust collector of Embodiment 2 of this disclosure can still be modified based on the existing bag dust collector, but the internal structure of the dust collector is different from the internal structure of the dust collector of Embodiment 1.

[0067] The specific modification scheme for transforming the above-mentioned bag filter into the dust collector of Embodiment 2 of this disclosure is described below. First, the transverse flue 12 is modified. The original inclined baffle 14 is removed, and two shorter inclined baffles are installed at the front and rear sections of the transverse flue 12 respectively. The two ends of the middle section of the transverse flue 12 located between the front and rear sections are sealed with corresponding baffles, thereby dividing the main flue of the transverse flue 12 into four flues, namely the first intake flue 121, the first exhaust flue 122, the second intake flue 123, and the second exhaust flue 124. The first exhaust flue 122 is located above the first intake flue 121 (with independent inclined baffles between them), and the second exhaust flue 124 is located above the second intake flue 123 (also with independent inclined baffles between them). Second, all the filter bags in the vertical compartments 11 on both sides of the middle section are removed, and the filter bag mounting structure (perforated plate) is also disassembled, thereby making these vertical compartments 11 form cavities. Furthermore, these cavities are connected to form a first reaction compartment, in which a reactant addition structure is installed, and an internal flow guiding structure is set to form a tortuous flow channel. Finally, all the filter bags in the remaining vertical compartments 11 are replaced with metal membrane filter elements.

[0068] The dust collector of this second embodiment includes: a dust collector housing 1; an air inlet structure 2, disposed in the dust collector housing 1 and used to input the flue gas to be treated; an exhaust structure 3, disposed in the dust collector housing 1 and used to output the treated flue gas; and an internal partition system 4, disposed in the dust collector housing 1 and used to divide the dust collector housing 1 into the required compartments; wherein, the internal partition system 4 divides the dust collector housing 1 to form a first dust removal compartment, a first reaction compartment 11a, and a second dust removal compartment; the first dust removal compartment is provided with a first filter structure to form a first filter unit, the first filter unit being used to achieve first gas-solid filtration separation and recover the first solid phase impurities; the first reaction compartment is provided with a reactant addition structure. A first reaction unit is formed, and the reactant addition structure is used to add reactant to the first reaction unit. The reactant is used to react with the first gaseous impurity, thereby causing the first gaseous impurity to precipitate as a second solid impurity. A second filter structure is provided in the second dust removal compartment to form a second filter unit. The second filter unit is used to achieve second gas-solid filtration separation and recover the second solid impurity. The flue gas inlet of the first filter unit is connected to the air inlet structure 2, the flue gas inlet of the first reaction unit is connected to the flue gas outlet of the first filter unit, the flue gas outlet of the first reaction unit is connected to the flue gas inlet of the second filter unit, and the flue gas outlet of the second filter unit is connected to the exhaust structure 3.

[0069] Specifically, the flue gas to be treated is industrial silicon smelting flue gas, the first solid phase impurity mainly contains microsilica powder, the first gas phase impurity mainly contains sulfur dioxide, and the reactant includes a desulfurizing agent.

[0070] More specifically, the internal partition system 4 divides the dust collector housing 1 into vertical compartments 11 arranged in a grid pattern on a horizontal plane. The dust collector housing 1 is provided with transverse flues 12 connecting the vertical compartments 11. The transverse flues 12 include a first inlet flue 121, a first exhaust flue 122, a second inlet flue 123, and a second exhaust flue 124. The first exhaust flue 122 is located above the first inlet flue 121 (with independent inclined partitions between them), and the second exhaust flue 124 is located above the second inlet flue 123 (also with independent inclined partitions between them). The first exhaust flue 122 is located above the second inlet flue 123. Multiple vertical compartments in the area (i.e., vertical compartments 11 on both sides of the first intake flue 121 and the first exhaust flue 122) constitute independent first dust removal compartments. Multiple vertical compartments in the second area of ​​the dust collector housing 1 (i.e., vertical compartments 11 on both sides of the second intake flue 123 and the second exhaust flue 124) constitute independent second dust removal compartments. The first reaction compartment 11a is located in the third area of ​​the dust collector housing 1. Each first dust removal compartment is provided with a first lower compartment and a first upper compartment. A first filter element mounting structure is provided between the first lower compartment and the first upper compartment. The first filter element mounting structure is used to install filters that extend into the filter housing. The first filter element (specifically a metal membrane filter element) in the first lower compartment is used to trap the first solid impurities in the first lower compartment; each second dust removal compartment is provided with a second lower compartment and a second upper compartment, and a second filter element mounting structure is provided between the second lower compartment and the second upper compartment. The second filter element mounting structure is used to install a second filter element (specifically a metal membrane filter element) extending into the second lower compartment, and the second filter element is used to trap the second solid impurities in the second lower compartment; the first air inlet flue 121 is simultaneously connected to the flue gas inlet of each first lower compartment. The first intake flue 121 has its intake end forming the intake port of the intake structure 2. The first exhaust flue 122 is connected to the exhaust outlet of each of the first upper compartments. The exhaust end of the first exhaust flue 122 is connected to the exhaust inlet of the first reaction unit (through the vent 20). The second intake flue 123 is connected to the exhaust inlet of each of the second lower compartments. The intake end of the second intake flue 123 is connected to the exhaust outlet of the first reaction unit. The second exhaust flue 124 is connected to the exhaust outlet of each of the second upper compartments. The exhaust end of the second exhaust flue 124 forms the exhaust port of the exhaust structure 3.

[0071] More specifically, the dust collector housing 1 is a rectangular housing on the horizontal plane, and the internal partition system 4 divides the rectangular housing into rectangular vertical compartments arranged in a grid pattern on the horizontal plane; the first region constitutes the first side of the rectangular housing, the second region constitutes the second side of the rectangular housing, and the first side and the second side are opposite sides; the third region is located between the first region and the second region.

[0072] More specifically, the vertical compartments located in the first region and the vertical compartments located in the second region are arranged in the horizontal plane as follows: two rows of vertical compartments are formed in the horizontal Y-axis direction, and each row of vertical compartments has multiple vertical compartments arranged in the horizontal X-axis direction; the main flue of the transverse flue 12, which is composed of the first air intake flue, the first exhaust flue, the second air intake flue, and the second exhaust flue, is arranged between the two rows of vertical compartments; the first region and the second region are distributed along the front-rear direction of the transverse flue 12 as a whole.

[0073] The dust collector in Example 2 retains the basic advantages of Example 1, while improving the rationality of flue gas flow through structural layout improvements.

[0074] Figure 13 This is a schematic diagram illustrating the principle of the dust collector according to Embodiment 3 of this disclosure. Figure 13 As shown, the dust collector of Embodiment 3 of this disclosure, based on the dust collector of Embodiment 2, further includes an SCR denitrification reaction unit assembled on the dust collector. The SCR denitrification reaction unit is located between the flue gas outlet of the second filter unit and the exhaust structure. Specifically, the SCR denitrification reaction unit is located in the second exhaust flue duct 124. The SCR denitrification reaction unit receives the flue gas output from the second filter unit, which has been supplemented with SCR denitrification reducing agent, and outputs denitrified treated flue gas after passing through the SCR denitrification catalyst.

[0075] Based on Example 2, the dust collector in Example 3 directly integrates the SCR denitrification reaction unit into the dust collector (located in the second exhaust flue), thereby improving the system integration.

[0076] Figure 14 This is a schematic diagram of the dust collector according to Embodiment 4 of this disclosure. Figure 15 This is a schematic diagram of the horizontal layout of the internal structure of the dust collector according to Embodiment 4 of this disclosure. Figure 16 for Figure 15 Sectional view along line AA. (See example) Figures 14-16 As shown, the dust collector of Embodiment 4 of this disclosure, based on the dust collector of Embodiment 2, reduces the occupation of the first reaction compartment 11a on the overall length of the dust collector, and through the design of related partitions, the first reaction compartment 11a has an annular flow channel surrounding the main flue of the transverse flue. Figures 14-15The reactant addition tube is inserted from top to bottom into the inlet of the annular flow channel. The flue gas inlet of the annular flow channel is connected to the exhaust end of the first exhaust flue, and the flue gas outlet of the annular flow channel is connected to the inlet end of the second intake flue. Figure 16 The wavy line indicates the flow direction of the flue gas in the annular flow channel. Furthermore, to reduce costs, filter bags continue to be used in the second dust removal compartment.

[0077] By reducing the footprint of the first reaction compartment 11a on the overall length of the dust collector, the space utilization of the first reaction compartment is optimized, thus providing conditions for the continued use of filter bags.

[0078] An industrial silicon smelting flue gas purification process utilizes the dust collector described in Example 4. The specific process route is as follows: First waste heat boiler unit (output flue gas temperature is 180℃) → Dust collector → (low-temperature) SCR denitrification reactor unit → Fan → Chimney.

[0079] The foregoing has described the relevant content of this disclosure. Those skilled in the art will be able to implement this disclosure based on these descriptions. All other embodiments obtained by those skilled in the art based on the foregoing content of this specification without inventive effort should fall within the scope of patent protection.

Claims

1. An industrial silicon smelting flue gas purification and treatment device, characterized in that: include: The first filtration unit is used to receive the flue gas to be treated output from the waste heat recovery device, perform a first gas-solid filtration separation on the flue gas to be treated, and recover the first solid phase impurities. The waste heat recovery device is used to receive the industrial silicon furnace smelting flue gas emitted from the industrial silicon smelting furnace and, after performing the first waste heat recovery utilization, output cooled flue gas with a temperature drop of 180℃-450℃. The cooled flue gas is the flue gas to be treated and contains the first solid phase impurities and the first gas phase impurities. The first solid phase impurities mainly contain microsilica powder, and the first gas phase impurities mainly contain sulfur dioxide. The first reaction unit is used to receive the flue gas after the first gas-solid filtration and separation output from the first filter unit, and to add a reactant to the flue gas after the first gas-solid filtration and separation so that the reactant comes into contact with the first gas phase impurity and reacts, thereby causing the first gas phase impurity to precipitate as a second solid phase impurity. The reactant includes a desulfurizing agent. The second filtration unit is used to receive the flue gas containing the second solid phase impurities output from the first reaction unit and perform a second gas-solid filtration separation on the flue gas containing the second solid phase impurities. An SCR denitrification reaction unit is also provided after the second filtration unit. The temperature of the flue gas output from the second filtration unit after the second gas-solid filtration separation can meet the requirements of the SCR denitrification reaction unit. The SCR denitrification reaction unit is used to receive the flue gas output from the second filtration unit with added SCR denitrification reducing agent and output denitrified flue gas after passing through the SCR denitrification catalyst.

2. The industrial silicon smelting flue gas purification and treatment device as described in claim 1, characterized in that: A dust collector is used, which includes a dust collector housing and an air inlet structure and an air outlet structure disposed in the dust collector housing; The dust collector housing is provided with an internal partition system, which divides the dust collector housing into a first dust removal compartment, a first reaction compartment and a second dust removal compartment. The first dust removal compartment is provided with a first filter structure to form the first filter unit, which is used to realize the first gas-solid filtration separation and recover the first solid phase impurities. The first reaction compartment is provided with a reactant addition structure to form the first reaction unit. The reactant addition structure is used to add reactant to the first reaction unit. The reactant is used to react with the first gaseous impurity, thereby causing the first gaseous impurity to precipitate as a second solid impurity. The second dust removal compartment is provided with a second filter structure to form the second filter unit, which is used to realize the second gas-solid filtration separation and recover the second solid phase impurities; The flue gas inlet of the first filter unit is connected to the air intake structure, the flue gas inlet of the first reaction unit is connected to the flue gas outlet of the first filter unit, the flue gas outlet of the first reaction unit is connected to the flue gas inlet of the second filter unit, and the flue gas outlet of the second filter unit is connected to the exhaust structure.

3. The industrial silicon smelting flue gas purification and treatment device as described in claim 2, characterized in that: The internal partition system divides the dust collector housing into vertical compartments arranged in a grid pattern on a horizontal plane. The dust collector housing is provided with transverse flues that run horizontally between the vertical compartments. The transverse flues include a first air intake flue, a first exhaust flue, a second air intake flue, and a second exhaust flue. Multiple vertical compartments located in the first area of ​​the dust collector housing constitute an independent first dust removal compartment, multiple vertical compartments located in the second area of ​​the dust collector housing constitute an independent second dust removal compartment, and the first reaction compartment is located in the third area of ​​the dust collector housing. Each of the first dust removal compartments is provided with a first lower compartment and a first upper compartment. A first filter element mounting structure is provided between the first lower compartment and the first upper compartment. The first filter element mounting structure is used to install a first filter element that extends into the first lower compartment. The first filter element is used to trap the first solid phase impurities in the first lower compartment. Each of the second dust removal compartments is provided with a second lower compartment and a second upper compartment. A second filter element mounting structure is provided between the second lower compartment and the second upper compartment. The second filter element mounting structure is used to install a second filter element that extends into the second lower compartment. The second filter element is used to trap the second solid phase impurities in the second lower compartment. The first air intake flue is simultaneously connected to the flue gas inlet of each of the first lower compartments, and the air intake end of the first air intake flue constitutes the air intake port of the air intake structure. The first exhaust flue is simultaneously connected to the flue gas outlet of each of the first upper compartments, and the exhaust end of the first exhaust flue is connected to the flue gas inlet of the first reaction unit. The second intake flue is connected to the flue gas inlet of each of the second lower compartments, the intake end of the second intake flue is connected to the flue gas outlet of the first reaction unit, the second exhaust flue is connected to the flue gas outlet of each of the second upper compartments, and the exhaust end of the second exhaust flue constitutes the exhaust port of the exhaust structure.

4. The industrial silicon smelting flue gas purification and treatment device as described in claim 3, characterized in that: The dust collector housing is a rectangular housing on the horizontal plane, and the internal partition system divides the rectangular housing into rectangular vertical compartments arranged in a grid pattern on the horizontal plane; The first region constitutes the first side of the rectangular box, and the second region constitutes the second side of the rectangular box. The first side and the second side are opposite sides. The third region is located between the first region and the second region or forms the third side of the rectangular box, and the third side is the adjacent side of the first side and / or the second side.

5. The industrial silicon smelting flue gas purification and treatment device as described in claim 4, characterized in that: The vertical compartments located in the first region and the vertical compartments located in the second region are arranged in the following manner on the horizontal plane: two rows of vertical compartments are formed in the horizontal Y-axis direction, and each row of vertical compartments has multiple vertical compartments arranged in the horizontal X-axis direction; The main flue of the transverse flue, which is formed by the first intake flue, the first exhaust flue, the second intake flue, and the second exhaust flue, is located between the two rows of vertical compartments; When the third region is located between the first region and the second region, the first region and the second region are distributed along the front-back direction of the main flue. When the third region constitutes the third side of the rectangular box, the first region and the second region are distributed on the left and right sides of the main flue.

6. The industrial silicon smelting flue gas purification and treatment device as described in claim 5, characterized in that: The first reaction compartment has an annular flow channel surrounding the main flue, the flue gas inlet of which is connected to the exhaust end of the first exhaust flue, and the flue gas outlet of which is connected to the intake end of the second intake flue.

7. The industrial silicon smelting flue gas purification and treatment device according to any one of claims 3-6, characterized in that: Each vertical compartment is equipped with an ash hopper at the bottom, and each ash hopper is equipped with an ash unloading device at the bottom.

8. The industrial silicon smelting flue gas purification and treatment device according to any one of claims 3-6, characterized in that: At least one vertical compartment located in the third region of the dust collector housing constitutes the first reaction compartment, and a tortuous flow channel is formed in the first reaction compartment through an internal flow guiding structure.

9. The industrial silicon smelting flue gas purification and treatment device according to any one of claims 2-6, characterized in that: In the first filtration structure and the second filtration structure, at least the first filtration structure uses a metal filter element or a ceramic filter element.

10. The industrial silicon smelting flue gas purification and treatment device according to any one of claims 2-6, characterized in that: The dust collector is also equipped with the SCR denitrification reaction unit, which is located between the flue gas outlet of the second filter unit and the exhaust structure.

11. The industrial silicon smelting flue gas purification and treatment device according to any one of claims 2-6, characterized in that: The dust collector was constructed by modifying the dust collector housing of an existing dust collector.

12. The industrial silicon smelting flue gas purification and treatment device according to any one of claims 2-6, characterized in that: During operation, the filtration velocity of at least one of the first and second filter units is 0.8 m / min to 1.5 m / min.

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