Industrial kiln flue gas cleaning equipment

Abstract

This utility model discloses an industrial kiln flue gas purification device that solves the technical problem of insufficient SCR denitrification reaction temperature. It includes: a waste heat recovery device for waste heat recovery and treatment, then outputting flue gas from the waste heat recovery device; a first dust removal device for first dust removal and treatment, then outputting flue gas from the first dust removal device; a reactive desulfurization device for contact reaction with a desulfurizing agent, then outputting flue gas from the reactive desulfurization device; a second dust removal device for second dust removal and treatment, then outputting flue gas from the second dust removal device; an SCR denitrification reaction device for SCR denitrification, then outputting flue gas from the SCR denitrification reaction device; and a flue gas distribution device for inputting and mixing a portion of the industrial kiln output flue gas with at least one of the flue gas output from the waste heat recovery device, the flue gas output from the first dust removal device, and the flue gas output from the reactive desulfurization device, without passing through the waste heat recovery device.

Description

Technical Field

[0001] This utility model relates to the field of flue gas purification technology, specifically to dust removal devices and industrial kiln flue gas purification equipment. Background Technology

[0002] The technical solution involved in this application is based on the technical solution proposed by the applicant in patent application document with publication number CN119951316A (hereinafter referred to as the prior application). In the prior application, the applicant not only provided a dust collector, but also a purification and treatment device for industrial silicon smelting flue gas.

[0003] In one of the embodiments of the prior application, a dust collector is used to remove a first solid phase impurity and a first gaseous phase impurity from the flue gas to be treated in steps, and then outputs the treated flue gas. The dust collector 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 reaction compartment is provided with a reactant addition structure to form a first... The reaction unit includes a reactant addition structure for adding reactant to the first reaction unit. The reactant reacts with a first gaseous impurity, causing it to precipitate as a second solid impurity. A second dust removal compartment contains a second filtration structure, forming a second filtration unit. This second filtration unit separates the gas and solid phases and recovers 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. The first solid impurity may contain microsilica powder, the first gaseous impurity may contain sulfur dioxide, and the reactant includes a desulfurizing agent.

[0004] The dust collector described in the above embodiment is characterized by integrating a first filtration unit, a first reaction unit, and a second filtration unit, and can be constructed by modifying an existing dust collector housing. However, since the first reaction unit of this embodiment is confined within the dust collector housing, workers mainly operate inside the housing during the modification process, which presents operational inconvenience. Furthermore, it is difficult to conceive of any other location for the first reaction unit besides constructing it.

[0005] The industrial silicon smelting flue gas purification and treatment device in the prior application specifically includes: a first filtration unit, 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 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 a 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 includes microsilica powder, and the first gas phase impurity mainly includes sulfur dioxide; and a first reaction unit, used to receive the flue gas output from the first filtration unit after the first gas-solid filtration separation and pass it through the first... A reactant is added to the flue gas after gas-solid filtration separation to allow the reactant to react with the first gaseous impurities, thereby causing the first gaseous impurities to precipitate as second solid impurities. The reactant includes a desulfurizing agent. A second filtration unit is used to receive the flue gas containing the second solid impurities from the first filtration unit and perform a second gas-solid filtration separation on the flue gas containing the second solid impurities. An SCR denitrification reaction unit is also provided after the second filtration unit. The temperature of the flue gas after the second gas-solid filtration separation output from the second filtration unit 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.

[0006] Generally speaking, low-temperature SCR denitrification reaction units are more suitable for this type of SCR denitrification reaction unit. In this case, due to the significant reduction in flue gas temperature caused by the waste heat recovery device, coupled with factors such as operating condition fluctuations, the temperature of the flue gas output from the second filtration unit after the second gas-solid filtration separation is easily lower than that required by the SCR denitrification reaction unit, thus affecting the denitrification efficiency. Utility Model Content

[0007] The primary objective of this invention is to provide a dust removal device that addresses the technical problems of inconvenient construction and insufficient equipment configuration flexibility caused by the first reaction unit being confined inside the dust collector housing in the dust collectors of the prior art embodiments. Secondly, the objective of this invention is to provide an industrial kiln flue gas purification device that addresses the technical problem of insufficient SCR denitrification reaction temperature that easily occurs in the industrial silicon smelting flue gas purification devices of the prior art embodiments.

[0008] In a first aspect, a dust removal device is provided, comprising: a dust collector housing with an internal flue gas filtration structure forming a flue gas filter dust collector; an inlet structure disposed on the dust collector housing for inputting the flue gas to be removed; an exhaust structure disposed on the dust collector housing for outputting the removed flue gas; a bracket disposed below the dust collector housing to support the entire dust collector housing; and a portion of the dust collector housing is partially removed to form an opening for installing additional equipment that opens to the outside of the dust collector housing, wherein the side of the dust collector housing facing the opening for installing additional equipment forms an outer wall, thereby dividing the dust collector housing into sections. The first and second housings are located on either side of the installation opening of the additional equipment. The first housing contains a first flue gas filtration structure to form a first flue gas filter dust collector, and the second housing contains a second flue gas filtration structure to form a second flue gas filter dust collector. Each of the first and second flue gas filter dust collectors has an air inlet and an exhaust outlet. An additional flue gas treatment device is installed in the installation opening of the additional equipment. The additional flue gas treatment device is connected between the first and second flue gas filter dust collectors, so that it can operate in conjunction with the first and second flue gas filter dust collectors.

[0009] As an optimization and / or instantiation of the dust removal device in the first aspect above, further: a flue gas treatment device is installed between the exhaust port of the first flue gas filter dust collector and the inlet of the second flue gas filter dust collector, thereby connecting the exhaust port of the first flue gas filter dust collector and the inlet of the second flue gas filter dust collector, with the inlet of the first flue gas filter dust collector serving as the air intake structure and the exhaust port of the second flue gas filter dust collector serving as the exhaust structure.

[0010] As an optimization and / or instantiation of the above-mentioned dust removal device, further: the flue gas treatment equipment includes a reaction purification device, and the flue gas flow channel of the reaction purification device is provided with a reactant addition structure. The reactant addition structure is used to add reactant into the flue gas flow channel of the reaction purification device. The reactant is used to contact and react with the target substance in the flue gas, thereby causing the target substance to precipitate in the form of a set solid phase.

[0011] As an optimization and / or instantiation of the dust removal device of the first aspect above, further: the target substance comprises sulfur dioxide, and the reactant comprises a desulfurizing agent.

[0012] As an optimization and / or instantiation of the dust removal device in the first aspect above, further: the addition of flue gas treatment equipment includes waste heat recovery equipment.

[0013] As an optimization and / or instantiation of the dust removal device in the first aspect above, further: the waste heat utilization equipment adopts a waste heat boiler.

[0014] As an optimization and / or instantiation of the dust removal device in the first aspect above, further: the waste heat utilization equipment itself also serves as a reaction purification device, or a reaction purification device is connected in series on the waste heat utilization equipment, and a reactant addition structure is provided on the flue gas flow channel of the reaction purification device. The reactant addition structure is used to add reactant to the flue gas flow channel of the reaction purification device, and the reactant is used to contact and react with the target substance in the flue gas so that the target substance is precipitated in the form of a set solid phase.

[0015] As an optimization and / or instantiation of the dust removal device in the first aspect above, further: an SCR denitrification reaction module is also assembled on the top of the first flue gas filter dust collector. The SCR denitrification reaction module is used to perform SCR denitrification on the filtered flue gas of the first flue gas filter dust collector, and then output it from the exhaust port of the first flue gas filter dust collector.

[0016] As an optimization and / or instantiation of the dust removal device in the first aspect above, further: the exhaust port of the first flue gas filter dust collector is higher than the inlet of the second flue gas filter dust collector, and the flue gas flow channel with the added flue gas treatment equipment is designed so that the flue gas discharged from the exhaust port of the first flue gas filter dust collector flows into the inlet of the second flue gas filter dust collector from top to bottom.

[0017] As an optimization and / or instantiation of the dust removal device in the first aspect above, further: the flue gas treatment equipment is installed in the installation opening of the equipment by means of a bracket.

[0018] As an optimization and / or instantiation of the dust removal device in the first aspect above, further: the first housing and the second housing are obtained by partially dismantling and modifying the dust collector housing of an original bag filter; both the first flue gas filtration structure and the second flue gas filtration structure use metal filter elements or ceramic filter elements; the filtration velocities of the first flue gas filtration dust collector and the second flue gas filtration dust collector are both greater than the filtration velocities of the original bag filter dust collector.

[0019] The dust removal device of the first aspect above divides the dust collector housing into a first housing and a second housing by partially dismantling the dust collector housing to create an installation opening that opens to the outside of the dust collector housing. An additional flue gas treatment device is installed in the installation opening, connecting the first flue gas filter dust collector and the second flue gas filter dust collector. This solves the construction inconvenience problem caused by the first reaction unit being confined to the inside of the dust collector housing in the prior application. Workers can perform the installation of the additional flue gas treatment device from the outside of the dust collector housing, greatly improving construction convenience. At the same time, the installation opening provides flexible configuration space for different types of additional flue gas treatment devices, overcoming the technical limitations of the prior application's lack of other possibilities for equipment configuration, and significantly improving the adaptability and scalability of the dust removal device.

[0020] Secondly, an industrial kiln flue gas purification device is provided for the stepwise removal of dust, sulfur dioxide, and nitrogen oxides from the flue gas output from an industrial kiln and the recovery of heat from the flue gas. The device includes: a waste heat recovery unit for treating the flue gas output from the industrial kiln for waste heat recovery, and then outputting the flue gas from the waste heat recovery unit; a first dust removal unit for treating the flue gas output from the waste heat recovery unit for first dust removal, and then outputting the flue gas from the first dust removal unit; and a reaction desulfurization unit for adding a desulfurizing agent to the flue gas output from the first dust removal unit, causing the sulfur dioxide in the flue gas to react with the desulfurizing agent, thereby reacting the sulfur dioxide with the desulfurizing agent. The products generated by the reaction precipitate out as solids and are then output as flue gas from the desulfurization reaction unit. A second dust removal unit is used to perform a second dust removal treatment on the flue gas output from the desulfurization reaction unit, and then output as flue gas from the second dust removal unit. An SCR denitrification reaction unit is used to perform SCR denitrification on the flue gas output from the second dust removal unit, and then output as flue gas from the SCR denitrification reaction unit. The system also includes a flue gas distribution device, which is used to input and mix a portion of the flue gas output from the industrial kiln with at least one of the flue gas output from the waste heat recovery unit, the flue gas output from the first dust removal unit, and the flue gas output from the desulfurization reaction unit without passing through the waste heat recovery device.

[0021] As an optimization and / or instantiation of the industrial kiln flue gas purification equipment mentioned in the second aspect above, further: a dust collector housing is used, which is provided with an air inlet structure and an exhaust structure, and a support bracket is provided below the dust collector housing to support the entire dust collector housing; wherein, a portion of the dust collector housing is removed to form an installation opening for the installation of additional equipment that opens to the outside of the dust collector housing, and the side of the dust collector housing facing the installation opening for the installation of additional equipment forms an outer wall, thereby dividing the dust collector housing into a first housing and a second housing located on both sides of the installation opening for the installation of additional equipment. The first housing is provided with a first flue gas filtration structure to form a first flue gas filtration dust collector, and the second housing is provided with a second flue gas filtration structure to form a second flue gas filtration dust collector. The first flue gas filtration dust collector and the second flue gas filtration dust collector each have... Equipped with an air inlet and an exhaust outlet, the first flue gas filter dust collector and the second flue gas filter dust collector respectively constitute the first dust removal device and the second dust removal device; an additional flue gas treatment device is installed in the equipment installation opening, and the additional flue gas treatment device is connected between the first flue gas filter dust collector and the second flue gas filter dust collector, so as to cooperate with the first flue gas filter dust collector and the second flue gas filter dust collector in operation. The additional flue gas treatment device includes a reaction desulfurization device, which is connected between the exhaust outlet of the first flue gas filter dust collector and the air inlet of the second flue gas filter dust collector, so as to conduct the exhaust outlet of the first flue gas filter dust collector and the air inlet of the second flue gas filter dust collector. The air inlet of the first flue gas filter dust collector serves as the air intake structure, and the exhaust outlet of the second flue gas filter dust collector serves as the exhaust structure.

[0022] As an optimization and / or instantiation of the industrial kiln flue gas purification equipment in the second aspect above, further: the exhaust port of the first flue gas filter dust collector is higher than the air inlet of the second flue gas filter dust collector, and the flue gas flow channel of the added flue gas treatment equipment is designed so that the flue gas discharged from the exhaust port of the first flue gas filter dust collector flows into the air inlet of the second flue gas filter dust collector from top to bottom.

[0023] As an optimization and / or instantiation of the industrial kiln flue gas purification equipment mentioned in the second aspect above, further: the reaction desulfurization unit is supported by a bracket in the installation opening of the added equipment.

[0024] As an optimization and / or instantiation of the industrial kiln flue gas purification equipment mentioned in the second aspect above, further: the first and second housings are obtained by partially dismantling and modifying the dust collector housing of an original bag filter; both the first and second flue gas filtration structures use metal or ceramic filter elements; the filtration velocities of both the first and second flue gas filtration dust collectors are greater than the filtration velocities of the original bag filter dust collector.

[0025] As an optimization and / or instantiation of the industrial kiln flue gas purification equipment in the second aspect above, further: the flue gas distribution device inputs a portion of the industrial kiln output flue gas into and mixes it with at least one of the three types of flue gas output from the waste heat recovery device, the first dust removal device, and the reaction desulfurization device, without passing through the waste heat recovery device, so that the temperature of the flue gas output from the second dust removal device is 180℃-250℃.

[0026] As an optimization and / or instantiation of the industrial kiln flue gas purification equipment mentioned in the second aspect above, further: the industrial kiln output flue gas is industrial silicon furnace smelting flue gas.

[0027] The industrial kiln flue gas purification equipment mentioned in the second aspect above, by setting up a flue gas distribution device, inputs and mixes a portion of the industrial kiln output flue gas into at least one of the three types of flue gas: the output flue gas from the waste heat recovery device, the output flue gas from the first dust removal device, and the output flue gas from the reaction desulfurization device. This effectively solves the problem of insufficient SCR denitrification reaction temperature caused by factors such as the significant reduction in flue gas temperature by the waste heat recovery device and fluctuations in operating conditions, as described in the previous application. Through the temperature regulation function of the flue gas distribution device, it ensures that the output flue gas from the second dust removal device can be maintained within the appropriate temperature range required by the SCR denitrification reaction device, thereby ensuring denitrification efficiency and achieving efficient stepwise removal of dust, sulfur dioxide, and nitrogen oxides from the industrial kiln output flue gas.

[0028] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Additional aspects and advantages of the present invention 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

[0029] The accompanying drawings, which form part of this specification, are used to aid in understanding the present invention. The contents provided in the drawings and their related descriptions in this specification can be used to explain the present invention, but do not constitute an undue limitation on the present invention.

[0030] Figure 1 This is a schematic diagram of the dust removal device according to Embodiment 1 of this utility model.

[0031] Figure 2 This is a schematic diagram of the dust removal device according to Embodiment 2 of this utility model.

[0032] The following are marked in the diagram: Dust collector housing 1; air inlet structure 11; exhaust structure 12; equipment installation opening 13; first housing 14; second housing 15; bracket 2; reaction purification device 3; reactant addition structure 31; flue gas distribution device 4; waste heat utilization device 5. Detailed Implementation

[0033] The present invention 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 invention based on these descriptions. Before describing the present invention in conjunction with the accompanying drawings, it should be particularly noted that:

[0034] 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.

[0035] The embodiments of the present invention described below are generally only some embodiments and not all embodiments. Based on these embodiments, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of patent protection.

[0036] Regarding terminology and units in this specification: The term "comprising" and any variations thereof in this specification, the corresponding claims, and related sections are intended to cover a non-exclusive inclusion. Furthermore, other related terms and units can be reasonably interpreted based on the relevant information provided in this specification.

[0037] Example 1

[0038] See Figure 1 This embodiment provides a dust removal device, including a dust collector housing 1, with an internal flue gas filtration structure forming a flue gas filter dust collector. The dust collector housing 1 is equipped with an air inlet structure 11 for inputting the flue gas to be removed, and an exhaust structure 12 for outputting the removed flue gas. A support 2 is provided below the dust collector housing 1 to support the entire dust collector housing 1.

[0039] A portion of the dust collector housing 1 is removed to create an opening 13 for installing additional equipment, which opens to the outside of the housing 1. The side of the dust collector housing 1 facing the opening 13 forms an outer wall, thus dividing the dust collector housing 1 into a first housing 14 and a second housing 15 located on either side of the opening 13. The first housing 14 contains a first flue gas filtration structure, forming a first flue gas filter dust collector, and the second housing 15 contains a second flue gas filtration structure, forming a second flue gas filter dust collector. Each of the first and second flue gas filter dust collectors has an inlet and an outlet.

[0040] In this embodiment, an auxiliary flue gas treatment device, namely a reaction purification device 3, is installed in the installation opening 13. The reaction purification device 3 is connected between the first flue gas filter and the second flue gas filter, specifically between the exhaust port of the first flue gas filter and the inlet of the second flue gas filter, thereby connecting the exhaust port of the first flue gas filter and the inlet of the second flue gas filter. The inlet of the first flue gas filter serves as the inlet structure 11, and the exhaust port of the second flue gas filter serves as the exhaust structure 12.

[0041] The flue gas flow channel of the reaction purification device 3 is equipped with a reactant addition structure 31, which is used to add reactant into the flue gas flow channel of the reaction purification device 3. The reactant is used to react with the target substance in the flue gas, thereby causing the target substance to precipitate in the form of a predetermined solid phase. In specific applications, the target substance contains sulfur dioxide, and the reactant contains a desulfurizing agent.

[0042] The reaction purification device 3 is supported by bracket 2 within the installation opening 13. The first housing 14 and the second housing 15 are obtained by partially dismantling and modifying the dust collector housing of an original bag filter. Both the first and second flue gas filtration structures use metal filter elements. The filtration velocities of both the first and second flue gas dust collectors are higher than those of the original bag filter.

[0043] Based on the aforementioned dust removal device, this embodiment further provides an industrial kiln flue gas purification device for stepwise removal of dust, sulfur dioxide, and nitrogen oxides from the industrial kiln output flue gas and recovery of the heat from the industrial kiln output flue gas. This industrial kiln flue gas purification device includes a waste heat recovery device, a first dust removal device, a reaction purification device 3, a second dust removal device, and an SCR denitrification reaction device.

[0044] Waste heat recovery devices are used to recover waste heat from the flue gas output from industrial kilns, and then output the waste heat recovery device's flue gas.

[0045] The first flue gas filter dust collector constitutes the first dust removal device, which is used to perform first dust removal treatment on the flue gas output from the waste heat recovery device, and then output the flue gas from the first dust removal device.

[0046] The reaction purification device 3 constitutes a reaction desulfurization device, which is used to add a desulfurizing agent to the flue gas output from the first dust removal device so that the sulfur dioxide in the flue gas output from the first dust removal device comes into contact with the desulfurizing agent and reacts, thereby causing the product generated by the reaction of sulfur dioxide and desulfurizing agent to precipitate out in the form of a solid phase, and then the flue gas output from the reaction desulfurization device is discharged.

[0047] The second flue gas filter dust collector constitutes the second dust removal device, which is used to perform second dust removal treatment on the flue gas output from the reaction desulfurization unit, and then output the flue gas from the second dust removal device.

[0048] The SCR denitrification reactor (a low-temperature SCR denitrification reactor with an operating temperature of 180℃-250℃) is used to perform SCR denitrification on the flue gas output from the second dust removal device, and outputs the flue gas from the SCR denitrification reactor.

[0049] In addition, the industrial kiln flue gas purification equipment also includes a flue gas distribution device 4, which is used to input and mix a portion of the industrial kiln output flue gas into at least one of the three: the output flue gas of the waste heat recovery device, the output flue gas of the first dust removal device, and the output flue gas of the reaction desulfurization device, without passing through the waste heat recovery device, so that the temperature of the output flue gas of the second dust removal device is 180℃-250℃.

[0050] In practical applications, the flue gas output from the industrial kiln is the smelting flue gas from an industrial silicon furnace. The industrial silicon furnace smelting flue gas first undergoes waste heat recovery treatment via a waste heat recovery device. Simultaneously, through the flue gas distribution device 4, a portion of the high-temperature industrial silicon furnace smelting flue gas is mixed with the flue gas output from the first dust removal device to regulate the temperature. The high-temperature industrial silicon furnace smelting flue gas then enters the first dust removal device for primary dust removal treatment, removing and recovering microsilica powder from the industrial silicon furnace smelting flue gas. The flue gas output from the first dust removal device then enters the reactive desulfurization device, where a desulfurizing agent is added to the flue gas flow channel through the reactant addition structure 31, causing the sulfur dioxide in the industrial silicon furnace smelting flue gas to react with the desulfurizing agent. The products generated from the reaction of sulfur dioxide and the desulfurizing agent precipitate out as solids. The flue gas output from the reactive desulfurization device then enters the second dust removal device for secondary dust removal treatment, further removing the reacted solids and residual dust. After precise adjustment by the flue gas distribution device 4, the temperature of the flue gas output from the second dust removal device is maintained within the range of 180℃-250℃ to meet the operating temperature requirements of the low-temperature SCR denitrification reactor. Finally, the flue gas output from the second dust removal device enters the SCR denitrification reactor for SCR denitrification treatment to remove nitrogen oxides from the industrial silicon furnace smelting flue gas. The flue gas is then output from the SCR denitrification reactor, completing the full-process purification treatment of the industrial silicon furnace smelting flue gas.

[0051] Example 2

[0052] See Figure 2 This embodiment provides another dust removal device. The basic structure of this dust removal device is the same as that of Embodiment 1, including a dust collector housing 1, an air inlet structure 11, an exhaust structure 12, a support 2, and an installation opening 13 for additional equipment formed by partial dismantling. The dust collector housing 1 is divided into a first housing 14 and a second housing 15, which respectively form a first flue gas filter dust collector and a second flue gas filter dust collector.

[0053] In this embodiment, the flue gas treatment equipment installed in the installation opening 13 is a waste heat utilization device 5. The waste heat utilization device 5 adopts a waste heat boiler and is connected between the exhaust port of the first flue gas filter and the inlet of the second flue gas filter.

[0054] Another feature of this embodiment is that the waste heat recovery device 5 also functions as a reaction purification device 3. A reactant addition structure 31 is provided on the flue gas flow channel of the waste heat recovery device 5. The reactant addition structure 31 is used to add reactant into the flue gas flow channel of the waste heat recovery device 5. The reactant is used to react with the target substance in the flue gas, thereby causing the target substance to precipitate in the form of a set solid phase.

[0055] The exhaust port of the first flue gas filter dust collector is higher than the inlet of the second flue gas filter dust collector. The flue gas flow channel of the added flue gas treatment equipment is designed so that the flue gas discharged from the exhaust port of the first flue gas filter dust collector flows into the inlet of the second flue gas filter dust collector from top to bottom.

[0056] The top of the first flue gas filter dust collector is also equipped with an SCR denitrification reaction module. This SCR denitrification reaction module is a medium-high temperature SCR denitrification reaction module, which is used to perform SCR denitrification on the filtered flue gas of the first flue gas filter dust collector, and then output it from the exhaust port of the second flue gas filter dust collector.

[0057] Based on the aforementioned dust removal device, this embodiment further provides an industrial kiln flue gas purification device for stepwise removal of dust, sulfur dioxide, and nitrogen oxides from the industrial kiln output flue gas and recovery of the heat from the industrial kiln output flue gas. This industrial kiln flue gas purification device includes a waste heat recovery device, a first dust removal device (with an SCR denitrification reaction module assembled on top), a waste heat utilization device 5 (also serving as a reaction purification device 3), and a second dust removal device.

[0058] Waste heat recovery devices are used to recover waste heat from the flue gas output from industrial kilns, and then output the waste heat recovery device's flue gas.

[0059] The first flue gas filter dust collector constitutes the first dust removal device, used to perform first dust removal treatment on the flue gas output from the waste heat recovery device, and then output the flue gas from the first dust removal device. The SCR denitrification reaction module is used to perform SCR denitrification on the filtered flue gas from the first flue gas filter dust collector, and then output it from the exhaust port of the second flue gas filter dust collector.

[0060] The waste heat utilization equipment 5, which also serves as the reaction purification device 3, constitutes a reaction desulfurization device. It is used to add desulfurizing agent to the flue gas output from the first dust removal device, so that the sulfur dioxide in the flue gas output from the first dust removal device comes into contact with the desulfurizing agent and reacts. As a result, the products generated by the reaction of sulfur dioxide and desulfurizing agent are released in the form of solid phase. At the same time, the flue gas is subjected to secondary waste heat recovery, and then the flue gas output from the reaction desulfurization device is discharged.

[0061] The second flue gas filter dust collector constitutes the second dust removal device, which is used to perform second dust removal treatment on the flue gas output from the reaction desulfurization unit, and then output the flue gas from the second dust removal device.

[0062] In practical applications, the flue gas output from industrial kilns is industrial silicon furnace smelting flue gas. The industrial silicon furnace smelting flue gas first undergoes waste heat recovery treatment through a waste heat recovery device. After temperature regulation, the flue gas enters a first dust removal device for primary dust removal treatment, removing and recovering microsilica powder from the industrial silicon furnace smelting flue gas. The filtered flue gas from the first dust removal device enters a medium-high temperature SCR denitrification reaction module assembled at the top of the first flue gas filter dust collector for SCR denitrification treatment, removing nitrogen oxides from the industrial silicon furnace smelting flue gas. The flue gas after SCR denitrification treatment then enters a reaction desulfurization device that also serves as waste heat utilization equipment 5. A desulfurizing agent is added to the flue gas flow channel through the reactant addition structure 31, causing sulfur dioxide in the flue gas to react with the desulfurizing agent. The products generated from the reaction of sulfur dioxide and the desulfurizing agent precipitate out as solids, while simultaneously performing secondary waste heat recovery from the flue gas. The flue gas output from the reaction desulfurization unit flows from the exhaust port of the first flue gas filter dust collector into the inlet of the second flue gas filter dust collector from top to bottom. The second dust collector performs a second dust removal process to further remove the solid phase generated by the reaction and the remaining dust. Then, the flue gas is discharged from the exhaust port of the second flue gas filter dust collector, completing the whole process purification treatment of the industrial silicon furnace smelting flue gas.

[0063] In Example 2, the medium-high temperature SCR denitrification reaction module is located immediately after the first dust removal device. At this time, the flue gas passes through the waste heat recovery device (primary waste heat recovery) and the first dust removal device, but the secondary waste heat recovery has not yet been carried out. Therefore, the flue gas temperature is still relatively high, which can meet the working temperature requirements of the medium-high temperature SCR denitrification reaction module. There is no need to mix the high temperature flue gas through the gas distribution device for additional temperature adjustment.

[0064] Example 3

[0065] This embodiment provides another dust removal device. The basic structure of this dust removal device is the same as that of Embodiment 2, including a dust collector housing 1, an air inlet structure 11, an exhaust structure 12, a support 2, and an installation opening 13 for additional equipment formed by partial dismantling. The dust collector housing 1 is divided into a first housing 14 and a second housing 15, which respectively form a first flue gas filter dust collector and a second flue gas filter dust collector.

[0066] In this embodiment, the flue gas treatment equipment installed in the installation opening 13 consists of a waste heat recovery device 5 and a reaction purification device 3. The waste heat recovery device 5 is a waste heat boiler, connected between the exhaust port of the first flue gas filter and the inlet of the second flue gas filter. The reaction purification device 3 is connected in series between the waste heat recovery device 5 and the inlet of the second flue gas filter. A reactant addition structure 31 is provided on the flue gas flow channel of the reaction purification device 3. The reactant addition structure 31 is used to add reactant to the flue gas flow channel of the reaction purification device 3. The reactant is used to react with the target substance in the flue gas, thereby causing the target substance to precipitate in the form of a set solid phase.

[0067] The exhaust port of the first flue gas filter dust collector is higher than the inlet of the second flue gas filter dust collector. The flue gas flow channel (formed by the waste heat utilization device 5 and the reaction purification device 3) with the flue gas treatment equipment is designed so that the flue gas discharged from the exhaust port of the first flue gas filter dust collector flows into the inlet of the second flue gas filter dust collector from top to bottom.

[0068] The top of the first flue gas filter dust collector is also equipped with an SCR denitrification reaction module. This SCR denitrification reaction module is a medium-high temperature SCR denitrification reaction module, which is used to perform SCR denitrification on the filtered flue gas of the first flue gas filter dust collector, and then output it from the exhaust port of the second flue gas filter dust collector.

[0069] Based on the aforementioned dust removal device, this embodiment further provides an industrial kiln flue gas purification device for stepwise removal of dust, sulfur dioxide, and nitrogen oxides from the industrial kiln output flue gas and recovery of the heat from the industrial kiln output flue gas. This industrial kiln flue gas purification device includes a waste heat recovery device, a first dust removal device (with an SCR denitrification reaction module assembled on top), a waste heat utilization device 5, a reaction purification device 3, and a second dust removal device.

[0070] Waste heat recovery devices are used to recover waste heat from the flue gas output from industrial kilns, and then output the waste heat recovery device's flue gas.

[0071] The first flue gas filter dust collector constitutes the first dust removal device, used to perform first dust removal treatment on the flue gas output from the waste heat recovery device, and then output the flue gas from the first dust removal device. The SCR denitrification reaction module is used to perform SCR denitrification on the filtered flue gas from the first flue gas filter dust collector, and then output it from the exhaust port of the second flue gas filter dust collector.

[0072] Waste heat recovery equipment 5 is used for secondary waste heat recovery of the flue gas output from the first dust removal device, and then the flue gas output from the waste heat recovery equipment is discharged. Reaction purification device 3 constitutes a reaction desulfurization device, which is used to add desulfurizing agent to the flue gas output from the waste heat recovery device, so that the sulfur dioxide in the flue gas output from the waste heat recovery device comes into contact with the desulfurizing agent and reacts, thereby causing the product generated by the reaction of sulfur dioxide and desulfurizing agent to precipitate out in the form of solid phase, and then the flue gas output from the reaction desulfurization device is discharged.

[0073] The second flue gas filter dust collector constitutes the second dust removal device, which is used to perform second dust removal treatment on the flue gas output from the reaction desulfurization unit, and then output the flue gas from the second dust removal device.

[0074] In practical applications, the flue gas output from industrial kilns is industrial silicon furnace smelting flue gas. The industrial silicon furnace smelting flue gas first undergoes waste heat recovery treatment through a waste heat recovery device. After temperature regulation, the flue gas enters a first dust removal device for primary dust removal treatment, removing and recovering microsilica powder from the industrial silicon furnace smelting flue gas. The filtered flue gas from the first dust removal device enters a medium-high temperature SCR denitrification reaction module assembled at the top of the first flue gas filter dust collector for SCR denitrification treatment, removing nitrogen oxides from the industrial silicon furnace smelting flue gas. The flue gas after SCR denitrification treatment then enters waste heat utilization equipment 5 for secondary waste heat recovery, and then enters a reactive desulfurization device. A desulfurizing agent is added to the flue gas flow channel through the reactant addition structure 31, causing sulfur dioxide in the flue gas to react with the desulfurizing agent. The products generated from the reaction of sulfur dioxide and the desulfurizing agent precipitate out as solid phases. The flue gas output from the reaction desulfurization unit flows from the exhaust port of the first flue gas filter dust collector into the inlet of the second flue gas filter dust collector from top to bottom. The second dust collector performs a second dust removal process to further remove the solid phase generated by the reaction and the remaining dust. Then, the flue gas is discharged from the exhaust port of the second flue gas filter dust collector, completing the whole process purification treatment of the industrial silicon furnace smelting flue gas.

[0075] The advantage of Example 3 compared to Example 2 is that the reaction purification device 3 is independently set up and connected in series between the waste heat recovery device 5 and the inlet of the second flue gas filter dust collector. This allows the waste heat recovery device 5 to focus on the secondary waste heat recovery function, while the reaction purification device 3 is specifically responsible for the desulfurization reaction. This is beneficial for optimizing the respective process parameters and equipment performance, and also facilitates independent maintenance. The disadvantage is that the addition of the independent reaction purification device 3 makes the overall equipment structure more complex.

[0076] The foregoing has described the relevant content of this utility model. Those skilled in the art will be able to implement this utility model 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. Industrial kiln flue gas purification equipment, used to remove dust, sulfur dioxide, and nitrogen oxides from the flue gas output from industrial kilns in stages and to recover the heat from the flue gas output from industrial kilns, including: Waste heat recovery device is used to recover waste heat from the flue gas output from industrial kilns, and then output the waste heat recovery device flue gas. The first dust removal device is used to perform first dust removal treatment on the flue gas output from the waste heat recovery device, and then output the flue gas output from the first dust removal device. The reactive desulfurization unit is used to add a desulfurizing agent to the flue gas output from the first dust removal unit, so that the sulfur dioxide in the flue gas output from the first dust removal unit comes into contact with the desulfurizing agent and reacts, thereby causing the products generated by the reaction of sulfur dioxide and desulfurizing agent to precipitate out in the form of solid phases, and then the flue gas output from the reactive desulfurization unit is discharged. The second dust removal device is used to perform a second dust removal treatment on the flue gas output from the reaction desulfurization device, and then output the flue gas from the second dust removal device. The SCR denitrification reactor is used to perform SCR denitrification on the flue gas output from the second dust removal device, and then output the flue gas from the SCR denitrification reactor. Its features are: It also includes a flue gas distribution device, which is used to input and mix a portion of the flue gas output from the industrial kiln into at least one of the flue gas output from the waste heat recovery device, the flue gas output from the first dust removal device, and the flue gas output from the reaction desulfurization device without passing through the waste heat recovery device.

2. The industrial kiln flue gas purification equipment as described in claim 1, characterized in that: A dust collector housing is used, which is equipped with an air inlet structure and an air outlet structure, and a support bracket is provided at the bottom of the dust collector housing to support the entire dust collector housing. The dust collector housing is partially dismantled to create an opening for the installation of additional equipment that faces the outside of the dust collector housing. The side of the dust collector housing facing the opening for the installation of additional equipment forms an outer wall, thereby dividing the dust collector housing into a first housing and a second housing located on both sides of the opening for the installation of additional equipment. The first housing is equipped with a first flue gas filtration structure to form a first flue gas filtration dust collector, and the second housing is equipped with a second flue gas filtration structure to form a second flue gas filtration dust collector. The first flue gas filtration dust collector and the second flue gas filtration dust collector are each equipped with an air inlet and an exhaust outlet. The first flue gas filtration dust collector and the second flue gas filtration dust collector respectively constitute the first dust removal device and the second dust removal device. An additional flue gas treatment device is installed in the installation opening. The additional flue gas treatment device is connected between the first flue gas filter and the second flue gas filter, so that it can operate in conjunction with the first and second flue gas filter. The additional flue gas treatment device includes a reaction desulfurization device, which is connected between the exhaust port of the first flue gas filter and the inlet of the second flue gas filter, so that the exhaust port of the first flue gas filter and the inlet of the second flue gas filter are connected. The inlet of the first flue gas filter serves as the air intake structure, and the exhaust port of the second flue gas filter serves as the exhaust structure.

3. The industrial kiln flue gas purification equipment as described in claim 2, characterized in that: The exhaust port of the first flue gas filter dust collector is higher than the inlet of the second flue gas filter dust collector. The flue gas flow channel of the added flue gas treatment equipment is designed so that the flue gas discharged from the exhaust port of the first flue gas filter dust collector flows into the inlet of the second flue gas filter dust collector from top to bottom.

4. The industrial kiln flue gas purification equipment as described in claim 2 or 3, characterized in that: The reactive desulfurization unit is supported by a bracket in the equipment installation opening.

5. The industrial kiln flue gas purification equipment as described in claim 2 or 3, characterized in that: The first and second housings were obtained by partially dismantling and modifying the housing of an original bag filter dust collector; both the first and second flue gas filtration structures use metal or ceramic filter elements; the filtration velocities of the first and second flue gas filtration dust collectors are both greater than the filtration velocities of the original bag filter dust collector.

6. The industrial kiln flue gas purification equipment as described in claim 1, characterized in that: The flue gas distribution device inputs a portion of the flue gas output from the industrial kiln into and mixes it with at least one of the flue gas output from the waste heat recovery device, the flue gas output from the first dust removal device, and the flue gas output from the reaction desulfurization device without passing through the waste heat recovery device, so that the temperature of the flue gas output from the second dust removal device is 180℃-250℃.

7. The industrial kiln flue gas purification equipment as described in claim 1, characterized in that: The flue gas output from the industrial kiln is the smelting flue gas from the industrial silicon furnace.

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