Dust collection and denitrification equipment and environmental systems including it

Abstract

The environmental system according to the present invention includes a desulfurization equipment that performs desulfurization of exhaust gas provided from a boiler, and a plurality of dust collection and denitrification equipment that performs dust collection and denitrification of the exhaust gas provided from the desulfurization equipment. The dust collection and denitrification equipment includes a main body into which the exhaust gas from the desulfurization equipment is introduced, a dust collection unit that forms a lower region of the main body and performs dust collection of the exhaust gas provided from the desulfurization equipment in the form of a bag filter, and a denitrification unit that forms an upper region of the main body and includes a honeycomb filter and performs denitrification of the exhaust gas provided from the dust collection unit.

Description

[Technical Field]

[0001] The present invention relates to a dust collection and denitrification facility and an environmental system including the same, and more particularly to a dust collection and denitrification facility for collecting dust and denitrifying exhaust gas discharged from a boiler or a combustion furnace, and an environmental system including the same. [Background technology]

[0002] In general, as regulations on environmental pollution become stricter, there has been an increase in research, development, and popularization of environmental systems that can reduce pollutant emissions in various processes such as power generation processes, incineration processes, and combustion processes. Environmental systems are systems that form a path for exhaust gases generated from boilers to be discharged to the outside air and remove pollutants contained in the exhaust gases.

[0003] FIG. 9 is a conceptual diagram that schematically illustrates a conventional environmental system.

[0004] As shown in Figure 9, in a conventional environmental system, exhaust gases generated from an incinerator 1 and a waste heat boiler 3 are discharged to the outside air via a chimney 11. A selective non-catalytic reduction (SNCR) device 2 is connected to the incinerator 1, and a first economizer 4, a desulfurization device 5, a dust collector 6, a heater 7, a denitrification device 8, a second economizer 9, and a wet scrubber 10 are sequentially arranged between the waste heat boiler 3 and the chimney 11. The desulfurization device 5 performs a desulfurization process for the exhaust gas. The dust collector 6 performs a dust removal process for the exhaust gas discharged from the desulfurization device 5, and the denitrification device 8 removes NOx from the exhaust gas, which is then discharged via the chimney 11. However, in a conventional environmental system, if the denitrification device 8 is installed before the chimney 11, the heater 7 must be used to raise the temperature of the exhaust gas in the denitrification device 8. More specifically, the temperature of the exhaust gas supplied to the denitrification equipment 8 is 160 to 170 degrees. However, since the filter installed in the denitrification equipment 8 can perform denitrification at a temperature of 200 degrees, the temperature of the exhaust gas must be raised via the heater 7 in order to enable denitrification of NOx in the denitrification equipment 8. This has led to the problem that conventional environmental systems inevitably waste energy in order to increase the temperature of the exhaust gas. Summary of the Invention [Problem to be solved by the invention]

[0005] An object of the present invention is to provide a dust collection and denitrification facility capable of performing dust collection and denitrification processes on exhaust gases having a temperature of 170° C. or less, and an environmental system including the same. [Means for solving the problem]

[0006] The environmental system according to the present invention includes a desulfurization equipment that performs desulfurization of exhaust gas provided from a boiler, and a plurality of dust collection and denitrification equipment that performs dust collection and denitrification of the exhaust gas provided from the desulfurization equipment. The dust collection and denitrification equipment includes a main body into which the exhaust gas from the desulfurization equipment is introduced, a dust collection unit that forms a lower region of the main body and performs dust collection of the exhaust gas provided from the desulfurization equipment in the form of a bag filter, and a denitrification unit that forms an upper region of the main body and includes a honeycomb filter and performs denitrification of the exhaust gas provided from the dust collection unit.

[0007] The environmental system further includes a selective non-catalytic reduction device provided in the waste heat boiler of the boiler and supplying a reducing agent to the exhaust gas of the waste heat boiler, the selective non-catalytic reduction device injecting the reducing agent at a location where the temperature of the exhaust gas is 850°C or higher.

[0008] An economizer is provided between the waste heat boiler and the desulfurization equipment, which heats the boiler's feedwater using heat of the exhaust gas, and a reducing agent injection unit is provided between the waste heat boiler and the economizer, which additionally injects a reducing agent toward the exhaust gas provided from the waste heat boiler to the economizer.

[0009] The environmental system further includes a reducing agent injection unit that additionally injects a reducing agent into a section between the waste heat boiler and the desulfurization equipment where the temperature of the exhaust gas is 300 to 400 degrees.

[0010] The dust collection and denitrification equipment further includes a reducing agent injection unit that injects a reducing agent toward the honeycomb filter below the honeycomb filter, and the reducing agent injected from the reducing agent injection unit is in a pre-heated and pre-vaporized state.

[0011] The dust collection and denitrification equipment further includes a pollutant removal unit disposed between the honeycomb filter and the dust collection unit, and the pollutant removal unit is connected to a compressed air unit that supplies compressed air and a reducing agent supply unit that supplies a reducing agent, so that the compressed air or the reducing agent is sprayed inside the dust collection and denitrification equipment.

[0012] The contaminant removal unit injects the compressed air into the dust collection unit to remove contaminants from the dust collection unit, or diffuses the reducing agent between the honeycomb filter and the dust collection unit.

[0013] The plurality of dust collection and denitrification equipments can each independently control the flow of exhaust gas flowing into them, and when one of the plurality of dust collection and denitrification equipments needs to remove pollutants from its dust collection section, the exhaust gas flow of the dust collection and denitrification equipment that needs to remove pollutants is blocked while maintaining operation of the entire system, and the compressed air is injected into the dust collection and denitrification equipment that needs to remove pollutants.

[0014] The honeycomb filter is manufactured using a catalyst powder method and is capable of removing NOx from exhaust gases having a temperature of 170 degrees or less.

[0015] The honeycomb filter is manufactured using a catalytic powder method and can remove NOx from exhaust gases with temperatures below 170°C through cleaning and coating processes. It can be regenerated through the cleaning and coating processes. The cleaning process involves spraying cleaning materials such as dry ice pellets onto the filter, and the coating process involves coating the filter with a catalytically active material containing an aqueous solution of vanadium oxide.

[0016] The plurality of dust collection and denitrification equipments can each independently control the flow of exhaust gas flowing into them, and when one of the plurality of dust collection and denitrification equipments requires regeneration of its honeycomb filter, the cleaning and coating operations are carried out while maintaining operation of the entire system and blocking the flow of exhaust gas from the dust collection and denitrification equipment requiring regeneration of its honeycomb filter.

[0017] Meanwhile, the dust collection and denitrification equipment according to the present invention includes a main body connected to a desulfurization equipment that desulfurizes exhaust gas provided from a boiler, a dust collection unit that forms a lower region of the main body and collects dust from the exhaust gas provided from the desulfurization equipment using a bag filter, and a denitrification unit that forms an upper region of the main body and includes a honeycomb filter and performs denitrification of the exhaust gas provided from the dust collection unit. [Effects of the Invention]

[0018] The dust collection and denitrification equipment and the environmental system including the same according to the present invention have the following effects.

[0019] First, the present invention has the effect of reducing energy waste in the operation of environmental systems by removing pollutants contained in exhaust gases without additionally heating the exhaust gases.

[0020] Second, the present invention has the effect that when the performance of a catalytic filter is deteriorated by various pollutants, the poisoned filter can be regenerated into a new catalytic filter by cleaning the poisoned filter on-site and coating it with vanadium oxide.

[0021] The technical effects of the present invention as described above are not limited to the effects mentioned above, and other technical effects not mentioned will be clearly understood by those skilled in the art from the following description. [Brief explanation of the drawings]

[0022] [Figure 1] 1 is a conceptual diagram illustrating an environmental system according to an embodiment of the present invention. [Figure 2] 1 is a conceptual diagram showing a dust collection and denitrification facility of an environmental system according to an embodiment of the present invention. [Figure 3] 1 is a conceptual diagram showing a honeycomb filter installed in a dust collection and denitrification facility of an environmental system according to an embodiment of the present invention. [Figure 4] 2 is a flow chart showing a honeycomb filter manufacturing process for the dust collection and denitrification equipment according to the present embodiment. [Figure 5] 3 is a flow chart showing a filter coating process in the honeycomb filter manufacturing process of the dust collection and denitrification equipment according to the present embodiment. [Figure 6] FIG. 2 is a conceptual diagram illustrating a first reducing agent injection unit of the environmental system according to the present embodiment. [Figure 7] FIG. 3 is a conceptual diagram schematically illustrating a second reducing agent injection unit of the environmental system according to the present embodiment. [Figure 8] FIG. 3 is a conceptual diagram illustrating a third reducing agent injection unit and a pollutant removal section of the dust collection and denitrification equipment according to the present embodiment. [Figure 9] FIG. 1 is a conceptual diagram illustrating a conventional environmental system. DETAILED DESCRIPTION OF THE INVENTION

[0023] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the embodiments are not limited to the embodiments disclosed below and may be embodied in various forms. Furthermore, the embodiments are provided merely to complete the disclosure of the present invention and to fully convey the scope of the invention to those skilled in the art. The shapes of elements in the drawings may be exaggerated for clarity, and elements denoted by the same reference numerals in the drawings refer to the same elements.

[0024] Fig. 1 is a conceptual diagram showing an outline of an environmental system according to this embodiment, Fig. 2 is a conceptual diagram showing a dust collection and denitrification equipment of the environmental system according to this embodiment, and Fig. 3 is a conceptual diagram showing a honeycomb filter installed in the dust collection and denitrification equipment of the environmental system according to this embodiment.

[0025] As shown in Figures 1 to 3, the environmental system 1000 of this embodiment forms a path through which exhaust gas discharged from the boiler 100 in various processes such as the power generation process, the incineration process, and the combustion process is discharged through the chimney 600.

[0026] First, the boiler 100 may include an incinerator 110 and a waste heat boiler 130, and may have a combustion space in which a burner is installed. In the boiler 100, fuel may be supplied to the burner, and air may be introduced into the combustion space. As a result, the boiler 100 generates steam using thermal energy in the combustion space. At this time, the fuel supplied to the boiler 100 may be, but is not limited to, fossil fuels such as pulverized coal or heavy oil, biomass fuels, or garbage.

[0027] For example, when pulverized coal is used as a fossil fuel in the boiler 100, the burner is a pulverized coal burner that injects air and pulverized coal into the combustion space. As a result, the pulverized coal dispersed in the combustion space is in a suspended state so that space combustion can occur. In this case, the pulverized coal burner may be a low NOx burner that applies a NOx combustion method, but is not limited thereto.

[0028] Meanwhile, a selective non-catalytic reduction (SNCR) device 120 may be connected to the boiler 100. The selective non-catalytic reduction device 120 is connected to a waste heat boiler 130. The selective non-catalytic reduction device 120 injects a reducing agent into the waste heat boiler 130 to remove NOx at high temperatures.

[0029] For example, the reducing agent may include urea, anhydrous ammonia (NH), and aqueous ammonia (NHOH). Urea has low chemical costs, simple storage facilities, is easy to handle, and is not subject to environmental regulations. Anhydrous aqueous ammonia has the advantages of low chemical costs, low energy consumption, less transportation frequency, and small-scale storage facilities, requiring less space for injection equipment. Ammonia water can be stored and transported under atmospheric pressure, making it safer than anhydrous ammonia and requiring simple storage facilities, making it suitable for installation in densely populated areas. Therefore, in this embodiment, urea, anhydrous ammonia, and aqueous ammonia can be selectively used.

[0030] Meanwhile, in this embodiment, the selective non-catalytic reduction device 120 is described as being connected to the waste heat boiler 130, but the selective non-catalytic reduction device 120 can also be installed inside the waste heat boiler 130 to perform primary denitrification of exhaust gas.

[0031] An economizer 200 may be provided in the path of the exhaust gas provided from the boiler 100 to the environmental system 1000. The economizer 200 may heat the feed water of the boiler 100 based on the heat of the exhaust gas.

[0032] Meanwhile, the environmental system 1000 may include a desulfurization facility 300 and a dust collection and denitrification facility 400. However, this is merely for the purpose of explaining this embodiment, and the configuration of the environmental system 1000 is not limited thereto.

[0033] First, the desulfurization equipment 300 is disposed between the economizer 200 and the dust collection and denitrification equipment 400, and removes sulfur oxides from the exhaust gas that has passed through the economizer 200 from the boiler 100. For example, the exhaust gas discharged from the boiler 100 may contain a large amount of sulfur oxides due to the combustion of sulfur content in fossil fuels. Therefore, the desulfurization equipment 300 removes sulfur oxides from the exhaust gas, and the exhaust gas is provided to each of the dust collection and denitrification equipments 400.

[0034] Each dust collection and denitrification equipment 400 independently collects dust and denitrifies the exhaust gas provided from the desulfurization equipment 300 .

[0035] The dust collection and denitrification equipment 400 performs dust collection of the exhaust gas in a lower region (hereinafter referred to as a dust collection unit 410) where the exhaust gas is provided from the desulfurization equipment 300. The dust collection and denitrification equipment 400 performs denitrification of the exhaust gas in an upper region (hereinafter referred to as a denitrification unit 430) so that the exhaust gas is provided to a chimney 600 via a wet scrubber 500.

[0036] The dust collecting unit 410 performs dust collection using a bag filter, and the denitrification unit 430 performs denitrification using a selective catalytic reduction filter (hereinafter referred to as honeycomb filter 431) having a honeycomb cross section in the height direction.

[0037] Generally, as shown in Figure 9, incinerators, biomass boilers, and coal-fired power plants typically perform the denitrification process by installing a separate dust collection system 6 and a selective catalytic reduction (SCR) type denitrification system 8 before the chimney 11. Since the exhaust gas supplied to the denitrification system 8 has a temperature of 160-170°C, an additional energy source must be used to heat the exhaust gas to 200°C, at which low-temperature denitrification catalyst operation is possible. Therefore, a heater 7 is required between the dust collection system 6 and the denitrification system 8.

[0038] However, the dust collection and denitrification equipment 400 according to this embodiment performs dust collection and denitrification in a single facility, and in particular, the honeycomb filter 431 enables denitrification of exhaust gases having a temperature of 170°C or less. As a result, the environmental system 1000 according to this embodiment has a simplified system and is capable of denitrifying exhaust gases having a temperature of 170°C or less, thereby reducing the waste of energy used to increase the temperature of the exhaust gas.

[0039] Furthermore, when the dust collection equipment 6 and the denitrification equipment 8 are constructed separately as in the conventional system, additional space is required, and the exhaust gas must pass through two to three layers of filters installed inside the denitrification equipment 8. This typically results in a pressure loss of 150 to 200 mmH2O between the heater 7, the filter layers, and the second economizer 9, resulting in a power loss. However, the dust collection and denitrification equipment 400 of this embodiment is equipped with a honeycomb filter 431 on top of the dust collection section 410, thereby reducing the pressure loss to 50 mmH2O or less.

[0040] Meanwhile, the manufacturing method of the honeycomb filter 431 will be described in detail below with reference to the accompanying drawings.

[0041] FIG. 4 is a flow chart showing the cleaning process in the honeycomb filter manufacturing process of the denitrification equipment according to this embodiment, and FIG. 5 is a flow chart showing the filter coating process in the honeycomb filter manufacturing process of the denitrification equipment according to this embodiment.

[0042] As shown in FIGS. 4 and 5, the honeycomb filter 431 according to this embodiment is manufactured by the catalyst powder method.

[0043] Generally, to manufacture an ultra-low temperature catalytic filter, a high concentration of 3-6% vanadium must be added to the catalytic filter. However, if the vanadium content exceeds 3%, the excessive vanadium content can cause self-ignition during the drying and plasticizing process of the catalytic filter, resulting in numerous cracks in the catalytic layer. In other words, the quality of the catalytic filter inevitably deteriorates during the manufacturing process.

[0044] Therefore, pellet-type catalytic filters, which are easy to manufacture, are used in the manufacture of ultra-low temperature catalytic filters. However, it is virtually impossible to remove poisoning substances from pellet-type catalytic filters when the catalyst is poisoned. In other words, pellet-type catalytic filters cannot be regenerated, so they require constant replacement, which is extremely expensive.

[0045] However, the honeycomb filter 431 according to this embodiment is manufactured using a catalyst powder method. In this case, the honeycomb filter 431 can be produced as a new catalyst filter through a catalyst powder manufacturing process, a soil manufacturing process, an extrusion process, and a drying plasticization process.

[0046] Then, in order to convert the new catalytic filter manufactured by the catalytic powder method into an industrially applicable honeycomb filter 431, the new catalytic filter is subjected to a cleaning operation (S100) and a coating operation (S200).

[0047] First, in the cleaning operation, a new catalytic filter is transferred to a work environment (S110). For example, the work environment is a predetermined work location where cleaning of the new catalytic filter is carried out, and if necessary, the cleaning may be carried out with the new catalytic filter attached to the denitrification unit 430.

[0048] Next, the new catalytic filter is cleaned using a cleaning material such as dry ice pellets (S120). At this time, the dry ice pellets are sprayed toward the new catalytic filter using compressed air, and the spray pressure of the dry ice pellets is 4 to 8 bar, but is not limited thereto. However, if the compressed air is sprayed at a pressure below a set range, the new catalytic filter may not be cleaned smoothly, and if the compressed air is sprayed at a pressure above the set range, the new catalytic filter may be damaged.

[0049] In this cleaning process, dry ice pellets and compressed air are sprayed toward the honeycomb of the new catalyst filter, and manufacturing residues remaining in the pores of the new catalyst filter are crushed and removed by the kinetic energy of the collision with the dry ice pellets. Here, the manufacturing residues remaining in the pores of the new catalyst filter include, but are not limited to, contaminants, such as binders, remaining during the production process of the new catalyst filter.

[0050] Meanwhile, when dry ice pellets are sprayed, the dry ice particles inside the honeycomb of the new catalytic filter penetrate and then sublimate (expanding 500 to 800 times in volume), causing the manufacturing residue to be expelled from the pores to the outside. In other words, the dry ice particles quickly passing between the inner walls of the honeycomb create an instantaneous vacuum, allowing the manufacturing residue inside the pores to be expelled to the outside.

[0051] After the cleaning process for the new catalytic filter is completed, a coating process is performed in which the new catalytic filter is coated with a catalytically active material and heated to manufacture the honeycomb filter 430. Here, the catalytically active material may include an aqueous solution of vanadium oxide.

[0052] In the coating process of the new catalytic filter, the new catalytic filter is transferred to the working environment (S210). However, the coating process of the new catalytic filter may be performed in the same environment as the cleaning environment, and if necessary, the coating process may be performed with the new catalytic filter attached to the denitrification unit 430.

[0053] Then, catalytic active material is sprayed toward the new catalytic filter (S220). The new catalytic filter coated with the catalytic active material may then be heated and subjected to a drying and plasticizing process (S230). For example, if the new catalytic filter is not installed in the denitrification unit 430, i.e., if coating is performed in a separate working environment, the drying and plasticizing process may be performed using a separate heating device or by transferring the new catalytic filter to a heated environment. For another example, if the new catalytic filter is installed in the denitrification unit 430, a separate drying and plasticizing process is not necessary, and the new catalytic filter may be dried and plasticized by operating the boiler 100 connected to the environmental system 1000. Even if coating is performed without installing the new catalytic filter in the denitrification unit 430, the coated new catalytic filter may be installed in the denitrification unit 430 and the boiler 100 may be operated to dry and plasticize the new catalytic filter.

[0054] Therefore, the new catalytic filter manufactured using the catalytic powder method can be converted into a honeycomb filter 431 suitable for low-temperature denitrification below 170 degrees by completing the drying and plasticization after cleaning with dry ice pellets and coating with vanadium oxide.

[0055] When the honeycomb filter 431 needs to be regenerated due to poisoning, it can be regenerated by sequentially performing the cleaning process and the coating process described above.

[0056] Meanwhile, referring again to FIGS. 1 to 3, the denitrification unit 430 of the dust collection and denitrification equipment 400 requires a reducing agent in the process of removing NOx.

[0057] As shown in FIG. 9, the conventional reducing agent supply is performed before the dust collection device 6. That is, the reducing agent is directly injected into the exhaust gas provided from the desulfurization device 5 to the dust collection device 6. As a result, the exhaust gas passes through the dust collection device 6 together with the reducing agent. However, when the reducing agent is supplied before the dust collection device 6, the reducing agent is injected into the exhaust gas having a temperature of 170°C or less. At this time, the reducing agent is not sufficiently vaporized due to the low exhaust gas temperature, resulting in an increased amount of reducing agent required. Furthermore, as the amount of reducing agent required increases, corrosion of subsequent equipment occurs more quickly due to the reducing agent. That is, when the reducing agent is supplied before the dust collection device 6, there are problems such as reduced energy efficiency and rapid equipment deterioration.

[0058] However, the denitrification unit 430 according to this embodiment may receive a reducing agent that has slipped from the selective non-catalytic reduction device 120. As described above, the selective non-catalytic reduction device 120 directly injects the reducing agent into the waste heat boiler 130, thereby removing NOx at a high temperature of 850°C or higher.

[0059] However, when removing NOx in the waste heat boiler 130 using the selective non-catalytic reduction device 120, the amount of reducing agent used must be about 1.5 to 2.0 times higher than when operating the denitrification equipment 8 (see FIG. 9). Therefore, to reduce the amount of reducing agent used, the amount of NOx removed by the selective non-catalytic reduction device 120 must be reduced and the amount of NOx removed by the denitrification unit 430 must be increased. In this case, the operation of the denitrification unit 430 may become difficult due to the slippage of the reducing agent injected from the selective non-catalytic reduction device 120 alone. Therefore, the environmental system 1000 includes an additional reducing agent injection unit.

[0060] Hereinafter, a reducing agent injection unit according to various embodiments will be described with reference to the accompanying drawings.

[0061] FIG. 6 is a conceptual diagram that schematically shows the first reducing agent injection unit of the environmental system according to this embodiment.

[0062] As shown in FIG. 6, the first reducing agent injection unit 810 according to this embodiment directly injects a reducing agent toward the exhaust gas before the economizer 200, thereby allowing the removal of NOx in the denitrification unit 430.

[0063] For example, the exhaust gas supplied from the waste heat boiler 130 to the economizer 200 has a temperature of approximately 300 to 400° C. Therefore, the first reducing agent injection unit 810 directly injects the reducing agent toward the exhaust gas having a sufficiently high temperature, thereby causing most of the reducing agent to be vaporized. As a result, the denitrification unit 430 can stably remove NOx.

[0064] Meanwhile, it may be difficult to directly connect the first reducing agent injection unit 810 to the path depending on the environment, structure, and conditions of the environmental system 1000. Therefore, the injection of the reducing agent may be performed in the denitrification unit 430 of the dust collection and denitrification equipment 400.

[0065] FIG. 7 is a conceptual diagram that schematically shows the second reducing agent injection unit of the environmental system according to this embodiment.

[0066] 7, the second reducing agent injection unit 820 according to this embodiment injects a reducing agent from inside the denitrification unit 430 toward the exhaust gas, thereby removing NOx in the denitrification unit 430. At this time, the reducing agent is pre-heated and pre-vaporized, and the second reducing agent injection unit 820 may include a plurality of nozzles corresponding to the entire area of ​​the honeycomb filter 431.

[0067] The second reducing agent injection unit 820 is disposed between the dust collecting part 410 and the honeycomb filter 431 to inject the reducing agent toward the honeycomb filter 431. As a result, the second reducing agent injection unit 820 is not affected by dust particles and can prevent the bag filter of the dust collecting part 410 from being clogged by the reducing agent.

[0068] Meanwhile, a bag filter is provided in the dust collection unit 410. Thus, the bag filter may be filled with contaminants during operation of the environmental system 1000. Therefore, the dust collection and denitrification equipment 400 may include a contaminant removal unit for removing contaminants from the bag filter.

[0069] FIG. 8 is a conceptual diagram that schematically illustrates the pollutant removal section of the dust collection and denitrification equipment according to this embodiment.

[0070] 8, the denitrification unit 430 according to this embodiment may include a pollutant removal unit 900 that discharges a reducing agent or compressed air toward the bag filter between the bag filter and the honeycomb filter 431. The pollutant removal unit 900 includes a plurality of nozzles and is connected to a third reducing agent supply unit 830 that supplies a reducing agent and a compressed air supply unit 850 that supplies compressed air.

[0071] Therefore, the pollutant removal unit 900 can receive the reducing agent from the third reducing agent supply unit 830 while the supply of compressed air is blocked by the valve. At this time, the pollutant removal unit 900 allows the reducing agent to be diffused inside the denitrification unit 430, thereby stably removing NOx.

[0072] In addition, the contaminant removal unit 900 may receive compressed air from the compressed air supply unit 850 while the supply of the reducing agent is blocked by a valve. In this case, the contaminant removal unit 900 may spray compressed air toward the bag filter to remove contaminants filled in the bag filter. In this case, the supply pressures of the third reducing agent supply unit 830 and the compressed air supply unit 850 may be different for the purpose of diffusion and cleaning.

[0073] As a result, the dust collection and denitrification equipment 400 can periodically cut off the supply of reducing agent required for denitrification catalyst operation based on the third reducing agent supply unit 830, and use the compressed air supply unit 850 to clean the bag filter and remove dust and the like.

[0074] Furthermore, the multiple dust collection and denitrification equipment 400 are provided so that they can be operated independently, and the flow of exhaust gas can be individually blocked for each dust collection and denitrification equipment 400 using a damper. This allows the bag filters to be cleaned independently while blocking the flow of exhaust gas for each required dust collection and denitrification equipment 400 without stopping the operation of the environmental system 1000. Furthermore, when the honeycomb filter 431 needs to be regenerated, cleaning and coating work for regenerating the honeycomb filter 431 can be performed without stopping the operation of the environmental system 1000 while blocking the flow of exhaust gas for the required dust collection and denitrification equipment 400.

[0075] As a result, the dust collection and denitrification equipment and the environmental system including the same according to the present invention have the following effects.

[0076] First, the present invention has the effect of reducing energy waste in the operation of environmental systems by removing pollutants contained in exhaust gases without additionally heating the exhaust gases.

[0077] Second, the present invention has the effect that when the performance of a catalytic filter is deteriorated by various pollutants, the poisoned filter can be regenerated into a new catalytic filter by cleaning the poisoned filter on-site and coating it with vanadium oxide.

[0078] The above description and the embodiments of the present invention shown in the drawings should not be construed as limiting the technical idea of ​​the present invention. The scope of protection of the present invention is limited only by the matters described in the claims, and those skilled in the art may improve or modify the technical idea of ​​the present invention in various forms. Therefore, such improvements and modifications, as long as they are obvious to those skilled in the art, fall within the scope of protection of the present invention.

Claims

1. a desulfurization facility for performing desulfurization of exhaust gas provided by the boiler; and a plurality of dust collection and denitrification units for performing dust collection and denitrification of the exhaust gas provided from the desulfurization unit; The dust collection and denitrification equipment comprises: a main body into which exhaust gas from the desulfurization equipment flows; a dust collector that forms a lower region of the main body and collects dust from the exhaust gas provided from the desulfurization equipment using a bag filter; a denitrification unit that forms an upper region of the main body and includes a honeycomb filter to perform denitrification of the exhaust gas provided from the dust collection unit.

2. The boiler further includes a selective non-catalytic reduction device provided in a waste heat boiler of the boiler and supplying a reducing agent to the exhaust gas of the waste heat boiler; The selective non-catalytic reduction device 2. The environmental system of claim 1, wherein the reducing agent is injected at a location where the temperature of the exhaust gas is 850 degrees or higher.

3. Between the waste heat boiler and the desulfurization equipment a coal economizer for heating the boiler feed water based on the heat of the exhaust gas; Between the waste heat boiler and the economizer 3. The environmental system according to claim 2, further comprising a reducing agent injection unit for additionally injecting a reducing agent toward the exhaust gas provided from the waste heat boiler to the economizer.

4. 3. The environmental system of claim 2, further comprising a reducing agent injection unit for additionally injecting a reducing agent into a section between the waste heat boiler and the desulfurization equipment where the temperature of the exhaust gas is 300 to 400 degrees.

5. The dust collection and denitrification equipment comprises: a reducing agent injection unit configured to inject a reducing agent toward the honeycomb filter from below the honeycomb filter, The reducing agent injected from the reducing agent injection unit is 3. The environmental system according to claim 2, wherein the gas is preheated and prevaporized.

6. The dust collection and denitrification equipment comprises: The honeycomb filter further includes a pollutant removal unit disposed between the honeycomb filter and the dust collection unit, The contaminant removal unit includes:

2. The environmental system according to claim 1, further comprising: a compressed air unit for supplying compressed air; and a reducing agent supply unit for supplying a reducing agent, wherein the compressed air or the reducing agent is sprayed inside the dust collection and denitrification equipment.

7. The contaminant removal unit includes: The environmental system according to claim 6, characterized in that the compressed air is injected into the dust collecting section to remove contaminants from the dust collecting section or to diffuse the reducing agent between the honeycomb filter and the dust collecting section.

8. The plurality of dust collection and denitrification facilities include: The flow of exhaust gas flowing into the interior can be controlled independently. The environmental system of claim 6, wherein when one of the plurality of dust collection and denitrification equipments requires removal of pollutants from its dust collection section, the exhaust gas flow of the dust collection and denitrification equipment requiring pollutant removal is blocked while maintaining operation of the entire system, and the compressed air is injected into the dust collection and denitrification equipment requiring pollutant removal.

9. The honeycomb filter is 2. The environmental system according to claim 1, which is manufactured using a catalyst powder method and is capable of removing NOx from exhaust gases having a temperature of 170 degrees or less.

10. The honeycomb filter is It is manufactured in a catalytic powder format and can remove NOx from exhaust gases with temperatures below 170 degrees through cleaning and coating processes, and can be regenerated through the cleaning and coating processes. The cleaning process involves spraying a cleaning substance, such as dry ice pellets, onto the filter.

2. The environmental system of claim 1, wherein the coating step involves coating a catalytically active material containing an aqueous solution of vanadium oxide.

11. The plurality of dust collection and denitrification facilities include: The flow of exhaust gas flowing into the interior can be controlled independently. The environmental system of claim 10, wherein when one of the plurality of dust collection and denitrification equipments requires regeneration of the honeycomb filter, the cleaning and coating operations are performed while maintaining operation of the entire system and blocking the flow of exhaust gas from the dust collection and denitrification equipment requiring regeneration of the honeycomb filter.

12. a main body for connecting to a desulfurization facility for performing desulfurization of exhaust gas provided by the boiler; a dust collecting unit that forms a lower region of the main body and collects dust from the exhaust gas provided from the desulfurization equipment in a bag filter manner; and a denitrification section that forms an upper region of the main body, includes a honeycomb filter, and performs denitrification of the exhaust gas provided from the dust collection section.

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