Flue gas treatment assembly for boiler SCR (Selective Catalytic Reduction) transformation

Abstract

The invention relates to the technical field of boiler flue gas treatment, in particular to a flue gas treatment assembly for boiler SCR transformation, which comprises a high-temperature economizer for treating flue gas and a low-temperature economizer arranged at one end of the high-temperature economizer, and the two ends of the high-temperature economizer are connected with the low-temperature economizer through flues; through the design of the positioning holes in the butt joint area of the extension pipe, the accuracy and stability of connection between the extension pipe and the high-temperature flue gas bypass valve and the SCR denitration system are guaranteed, meanwhile, through the corresponding design of the ventilation openings and the flow guide strips, smooth flowing of flue gas is guaranteed, the structural stability of the assembly is improved, and the service life of the assembly is prolonged. And the guide holes, the dome and the flow guide strips of the splitter plate play a role in uniformly dispersing the flue gas. The flue gas is prevented from locally accumulating and disorderly flowing in the pipeline, so that the flue gas is more reasonably distributed on the cross section of the whole pipeline, good conditions are created for subsequent dust reduction and temperature rise treatment, local abrasion to the pipeline and equipment is reduced, and the service life of the equipment is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of boiler flue gas treatment, and specifically to a flue gas treatment component for boiler SCR retrofit. Background Art

[0002] In industrial production, reducing the emission of nitrogen oxides (NO2) in flue gas is crucial for environmental protection. As an efficient denitrification technology, the SCR (Selective Catalytic Reduction) flue gas denitrification system has been widely used. This system mainly consists of an ammonia supply system, an ammonia / air injection system, a catalytic reaction system, and a control system, etc.

[0003] To avoid energy consumption during the flue gas reheating process, the SCR reactor is usually arranged at the high-dust section position behind the economizer and in front of the air preheater. Under this arrangement, ammonia is added at the horizontal pipe in front of the air preheater and is fully mixed with the flue gas. Through the action of the SCR system, NO2 in the flue gas can be effectively reduced to non-toxic and pollution-free N2 and H2O, significantly improving the efficiency of flue gas denitrification, and the secondary pollutants generated by the entire process are extremely few.

[0004] However, during the operation of the SCR system, temperature control is a crucial link. If the temperature of the SCR system cannot meet the requirements, a series of serious problems will occur. For example, the boiler denitrification catalyst will fail, resulting in excessive nitrogen oxides in the flue gas emissions and being difficult to control; the ammonia slip phenomenon will intensify, further causing blockages in the boiler economizer and air preheater tubes, leading to the failure of bag dust removal, and even making the boiler ash conveying system unable to operate normally.

[0005] Due to technical defects, the original SCR temperature control system often fails to reach the required temperature and cannot operate normally, which has a serious impact on normal production. Therefore, how to optimize the SCR temperature control system to ensure its stable and accurate temperature control has become an urgent problem to be solved. Summary of the Invention

[0006] Aiming at the deficiencies of the prior art, the present invention provides a flue gas treatment component for boiler SCR retrofit, which solves the problem that in the prior art, due to technical defects, the original SCR temperature control system often fails to reach the required temperature and cannot operate normally, which has a serious impact on normal production.

[0007] The flue gas treatment component for boiler SCR retrofit of the present invention includes a high-temperature economizer for treating flue gas and a low-temperature economizer arranged at one end of the high-temperature economizer. Both ends of the high-temperature economizer are connected to the low-temperature economizer through flue ducts; One end of the low-temperature economizer is provided with an SCR denitration system. The SCR denitration system is connected to the low-temperature economizer through a dust-removing and heat-insulating component. One end of the dust-removing and heat-insulating component is provided with a high-temperature flue gas bypass valve, and the high-temperature flue gas bypass valve heats up the flue gas flowing through the inside of the dust-removing and heat-insulating component. The dust-removing and heat-insulating component is connected to the SCR denitration system. The dust-removing and heat-insulating component includes an extension pipe. An inner cavity is arranged inside the extension pipe, and one or more positioning convex rings are arranged inside the inner cavity. The positioning convex rings are used to fix the flow dividing plate and the dust-removing and temperature-rising component.

[0008] As a further improvement of the present invention, docking areas are arranged at both ends of the extension pipe. Positioning holes are opened on the outside of the docking areas, and sealing rings are arranged at the outside of the positioning holes at the docking areas for connecting the high-temperature flue gas bypass valve and the SCR denitration system.

[0009] As a further improvement of the present invention, the flow dividing plate includes a plate body. Guide holes are arranged at equal intervals on the outside of the plate body for guiding the flue gas to pass through.

[0010] As a further improvement of the present invention, a convex ring is arranged in the middle of the other side of the plate body, and one or more high-temperature steam hollow plates are arranged in the middle of the inner side of the convex ring for dust-removing treatment of the passing flue gas.

[0011] As a further improvement of the present invention, one or more air outlet holes are opened on the outside of the high-temperature steam hollow plate for spraying high-temperature steam.

[0012] As a further improvement of the present invention, the dust-removing and temperature-rising component includes a dome. One or more diversion strips are arranged in an annular array on the outside of the dome for dispersing the passing flue gas.

[0013] As a further improvement of the present invention, a groove is arranged on the outside of the diversion strip, and an adhesion medium is filled in the groove for dust-removing treatment of the passing flue gas.

[0014] As a further improvement of the present invention, a heating component is arranged on one side of the dome. The heating component is distributed in an annular array on one side of the dome for heating the passing flue gas.

[0015] As a further improvement of the present invention, a threaded groove is arranged at the bottom of one side of the dome close to the diversion strip and the heating component for positioning the dome.

[0016] As a further improvement of the present invention, a thread is provided on the inner side of one of the positioning convex rings for fixing the dome in cooperation with the thread groove of the dome. A ventilation opening is provided on the outer side of the positioning convex ring, and the ventilation openings correspond to the guiding strips of the dome one by one for guiding the flue gas to pass through.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: Through the design of positioning holes in the docking area of the extension pipe, the present invention ensures the accuracy and stability of its connection with the high-temperature flue gas bypass valve and the SCR denitration system. At the same time, the corresponding design of the ventilation openings and the guiding strips ensures the smooth flow of the flue gas, improves the structural stability of the component, and the guiding holes, dome and guiding strips of the flow splitting plate all play a role in evenly dispersing the flue gas, avoiding local accumulation and disordered flow of the flue gas in the pipeline, making the flue gas distribution more reasonable across the entire pipeline cross-section, creating good conditions for subsequent dust reduction and temperature increase treatment, reducing local wear on the pipeline and equipment, and extending the service life of the equipment. Moreover, by using the high-temperature steam hollow plate of the flow splitting plate to spray high-temperature steam, it collides and adsorbs with the dust particles in the flue gas, making them coagulate and settle; the adhesion medium in the guiding strip groove of the dust reduction and temperature increase component can directly adsorb the dust particles. These two methods effectively reduce the dust content in the flue gas, protect the catalyst of the SCR denitration system, prevent its activity from decreasing, and improve the denitration efficiency and system stability. At the same time, the heating components of the dust reduction and temperature increase component are distributed in an annular array. In cooperation with the control system, the flue gas can be accurately heated to the optimal working temperature according to the real-time temperature of the flue gas and the working requirements of the SCR denitration system, improving the SCR denitration reaction efficiency, reducing nitrogen oxide emissions, and meeting environmental protection requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present application, and constitute a part of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application, and do not constitute an improper limitation of the present application. In the drawings: Figure 1 It is a front view structural schematic diagram of the high-temperature economizer, flue, low-temperature economizer, high-temperature flue gas bypass valve and SCR denitration system of the present invention; Figure 2 It is a top view structural schematic diagram of the high-temperature economizer, flue, low-temperature economizer, high-temperature flue gas bypass valve and SCR denitration system of the present invention; Figure 3 It is a three-dimensional structural schematic diagram of the dust reduction and heat preservation component of the present invention; Figure 4 It is a three-dimensional structural schematic diagram of the dust reduction and heat preservation component of the present invention from another angle; Figure 5 It is a front view structural schematic diagram of the dust reduction and heat preservation component of the present invention; Figure 6 This is a three-dimensional structural schematic diagram of another angle of the dust reduction and heat preservation component of the present invention; Figure 7 This is a side view structural schematic diagram of the dust reduction and heat preservation component of the present invention; Figure 8 This is the present invention Figure 7 Schematic diagram of the A-A cross-sectional structure in it.

[0019] In the figure: 1. High-temperature economizer; 2. Flue; 3. Low-temperature economizer; 4. High-temperature flue gas bypass valve; 5. Dust reduction and heat preservation component; 6. SCR denitration system; 7. Diverting plate; 8. Dust reduction and temperature increase component; 51. Extension pipe; 52. Docking area; 53. Positioning hole; 54. Sealing ring; 55. Positioning convex ring; 86. Inner cavity; 71. High-temperature steam hollow plate; 72. Plate body; 73. Air outlet hole; 81. Heating component; 82. Dome; 83. Flow guiding strip; 84. Threaded groove. Specific embodiments

[0020] The following will disclose multiple embodiments of the present invention with illustrations. For the sake of clarity, many physical details will be described together in the following narrative. However, it should be understood that these physical details are not used to limit the present invention. That is to say, in some embodiments of the present invention, these physical details are unnecessary. In addition, for the sake of simplifying the illustrations, some conventional structures and components will be shown in a simple schematic manner in the illustrations.

[0021] In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0022] Please refer to Figures 1-8 , the SCR flue gas denitration system is composed of an ammonia supply system, an ammonia / air injection system, a catalytic reaction system, a control system, etc. To avoid energy consumption for reheating the flue gas, generally, the SCR reactor is placed behind the economizer and before the air preheater, that is, arranged in the high-dust section. Ammonia is added to the horizontal pipeline before the air preheater and mixed with the flue gas.

[0023] The application of the SCR system effectively improves the efficiency of flue gas denitration, reduces NOX to non-toxic and pollution-free N₂ and H₂O, and makes the secondary pollutants generated by the whole process very few.

[0024] In the SCR system, temperature control is a crucial step. If the SCR temperature fails to meet the standard, it will cause the denitration catalyst of the boiler to fail, the nitrogen oxides in the flue gas emissions to exceed the standard and be uncontrollable, and the ammonia escape will also cause blockage of the economizer, air preheater tubes, and bag filters of the boiler, as well as the failure of the boiler ash conveying system and the inability of the boiler ash conveying system to operate normally.

[0025] The temperature of the original SCR temperature control system often fails to meet the standard, resulting in abnormal operation and affecting normal production. Based on this, the present application provides a flue gas treatment component for boiler SCR transformation, including a high-temperature economizer 1 for treating flue gas and a low-temperature economizer 3 provided at one end of the high-temperature economizer 1. Both ends of the high-temperature economizer 1 are connected to the low-temperature economizer 3 through a flue 2. One end of the low-temperature economizer 3 is provided with an SCR denitration system 6. The SCR denitration system 6 is connected to the low-temperature economizer 3 through a dust reduction and heat preservation component 5. One end of the dust reduction and heat preservation component 5 is provided with a high-temperature flue gas bypass valve 4, and the high-temperature flue gas bypass valve 4 heats up the flue gas flowing through the inside of the dust reduction and heat preservation component 5. The dust reduction and heat preservation component 5 is connected to the SCR denitration system 6. The dust reduction and temperature increase component 8 includes an extension pipe 51. The inside of the extension pipe 51 is provided with an inner cavity 56, and one or more positioning convex rings 55 are provided inside the inner cavity 56. The positioning convex rings 55 are used to fix the flow dividing plate 7 and the dust reduction and temperature increase component 8.

[0026] This flue gas treatment component includes a high-temperature economizer 1 for treating flue gas and a low-temperature economizer 3 provided at one end of the high-temperature economizer 1. Both ends of the high-temperature economizer 1 and the low-temperature economizer 3 are connected to each other through a flue 2. The high-temperature flue gas generated by the boiler first enters the high-temperature economizer 1. In the high-temperature economizer 1, the flue gas exchanges heat with the water in the economizer, enabling the water to absorb the heat in the flue gas, thereby increasing the temperature of the water and reducing the temperature of the flue gas at the same time. The flue gas preliminarily cooled by the high-temperature economizer 1 enters the low-temperature economizer 3 through the flue 2, where heat exchange continues to further reduce the temperature of the flue gas and recover the waste heat in the flue gas, improving the energy utilization efficiency.

[0027] An SCR denitration system 6 is provided at one end of the low-temperature economizer 3. This system is used to denitrate the flue gas treated by the economizer, reducing the nitrogen oxides in the flue gas to harmless nitrogen and water. The SCR denitration system 6 is connected to the low-temperature economizer 3 through a dust reduction and heat preservation component 5. The dust reduction and heat preservation component 5 can not only reduce the dust content in the flue gas, prevent dust from entering the SCR denitration system 6 and affecting the activity of the catalyst, but also play a heat preservation role for the flue gas, avoiding the temperature of the flue gas from being too low during the transmission process.

[0028] One end of the dust reduction and heat preservation component 5 is provided with a high-temperature flue gas bypass valve 4. When the temperature of the flue gas flowing through the inside of the dust reduction and heat preservation component 5 is too low, which may affect the normal operation of the SCR denitration system 6, the high-temperature flue gas bypass valve 4 is opened to introduce a part of the high-temperature flue gas into the dust reduction and heat preservation component 5, heating the flowing flue gas to raise its temperature so that the temperature of the flue gas reaches the optimal working temperature range of the SCR denitration system 6.

[0029] The dust reduction and heat preservation component 5 is connected to the SCR denitration system 6. It includes an extension pipe 51. An inner cavity 56 is provided inside the extension pipe 51. One or more positioning convex rings 55 are provided inside the inner cavity 56. These positioning convex rings 55 are used to fix the flow distribution plate 7 and the dust reduction and temperature raising component 8. The flow distribution plate 7 is installed on the positioning convex ring 55. Its function is to evenly distribute the flue gas entering the dust reduction and temperature raising component 8, so that the flue gas can more fully contact the temperature raising structure inside the dust reduction and temperature raising component 8, improving the temperature raising effect and the dust reduction efficiency. At the same time, the positioning convex ring 55 also plays a role in supporting and fixing the internal structure of the dust reduction and temperature raising component 8 to ensure its stable operation.

[0030] To ensure the stable operation of the entire flue gas treatment component, corresponding control systems and monitoring devices are also equipped. The control system can automatically adjust the opening degree of the high-temperature flue gas bypass valve 4 according to the working requirements of the SCR denitration system 6 and the actual parameters of the flue gas, controlling the amount of high-temperature flue gas entering the dust reduction and heat preservation component 5, thereby precisely controlling the temperature of the flue gas. The monitoring device can real-time monitor parameters such as the temperature, pressure, flow rate, and dust content of the flue gas, and feed back these data to the control system to timely adjust the operating state of the component.

[0031] By setting the high-temperature economizer 1 and the low-temperature economizer 3, two-stage heat exchange is carried out on the high-temperature flue gas generated by the boiler, fully recovering the waste heat in the flue gas, improving the energy utilization efficiency, and reducing the operating cost of the boiler.

[0032] The setting of the dust reduction and heat preservation component 5 can reduce the dust in the flue gas from entering the SCR denitration system 6, avoid the abrasion and pollution of the catalyst by the dust, and extend the service life of the catalyst. At the same time, the heat preservation function can prevent the temperature of the flue gas from being too low during the transmission process, ensure that the SCR denitration system 6 works in a suitable temperature environment, and improve the denitration efficiency.

[0033] The setting of the high-temperature flue gas bypass valve 4 enables the flue gas flowing through the dust reduction and heat preservation component 5 to be heated according to actual needs, ensuring that the temperature of the flue gas entering the SCR denitration system 6 reaches the optimal working range, and avoiding problems such as catalyst failure and excessive nitrogen oxide emissions caused by non-compliant temperature.

[0034] The design of the positioning convex ring 55 and the shunt plate 7 in the dust reduction and temperature increase component 8 ensures the uniform flow and efficient treatment of flue gas in the component, improves the dust reduction and temperature increase effects, and at the same time enhances the stability of the internal structure of the component, ensuring that the entire flue gas treatment component can operate stably and reliably.

[0035] Both ends of the extension pipe 51 are provided with docking areas 52. Positioning holes 53 are opened on the outer sides of the docking areas 52. A sealing ring 54 is arranged at the outer sides of the positioning holes 53 at the docking areas 52 for connecting the high-temperature flue gas bypass valve 4 and the SCR denitration system 6.

[0036] Both ends of the extension pipe 51 are provided with docking areas 52, which are key parts for connecting the high-temperature flue gas bypass valve 4 and the SCR denitration system 6. Positioning holes 53 are opened on the outer sides of the docking areas 52, which are important bases for precise installation and fixation.

[0037] During installation, first, clean and inspect the connection ports of the high-temperature flue gas bypass valve 4 and the SCR denitration system 6 to ensure that their surfaces are flat and free of debris. At the same time, prepare the appropriate connection bolts and the sealing ring 54. The sealing ring 54 is placed at a specific position in the docking area 52, and it will play a key role in sealing during the connection process.

[0038] Installation process Align one docking area 52 at one end of the extension pipe 51 with the connection port of the high-temperature flue gas bypass valve 4, and use the connection bolts for preliminary fixation through the positioning holes 53. During the process of tightening the bolts, ensure that the connection between the extension pipe 51 and the high-temperature flue gas bypass valve 4 is tight and the position is accurate. Then, connect the other docking area 52 at the other end of the extension pipe 51 to the connection port of the SCR denitration system in the same way. During the whole installation process, pay attention to observing the state of the sealing ring 54 to ensure that it does not shift or get damaged.

[0039] After installation, conduct a comprehensive inspection of the connection part to check whether the bolts are tightened and whether the sealing ring 54 is well sealed. Then, start the flue gas treatment system and conduct commissioning. Observe whether there is any flue gas leakage, and at the same time monitor parameters such as the temperature and flow rate of the flue gas to ensure that the whole system can operate normally.

[0040] During the operation of the boiler, the high-temperature flue gas enters the SCR denitration system through the extension pipe 51 from the high-temperature flue gas bypass valve 4. The design of the docking area 52 ensures that the flue gas can flow smoothly between the two components. The positioning holes 53 ensure the accuracy and stability of the connection, preventing the connection part from loosening due to factors such as vibration during operation. And the sealing ring 54 effectively prevents flue gas leakage, avoiding heat loss and environmental pollution.

[0041] The design of the positioning holes 53 enables the extension pipe 51 to be more precisely connected to the high-temperature flue gas bypass valve 4 and the SCR denitration system. During the installation process, the connection ports can be quickly and accurately aligned through the positioning holes 53. After being fixed with bolts, the stability of the connection part can be ensured, reducing loosening caused by factors such as vibration and ensuring the reliable operation of the entire flue gas treatment system.

[0042] The setting of the sealing ring 54 effectively improves the sealing performance of the connection part. It can prevent the leakage of high-temperature flue gas, avoid heat loss, and improve energy utilization efficiency. At the same time, it also reduces the pollution of the flue gas to the surrounding environment, meeting the environmental protection requirements.

[0043] The design of the docking area 52 makes the installation process of the extension pipe 51 and other components more convenient and fast. During the maintenance process, if a certain component needs to be repaired or replaced, only the connection bolts need to be loosened, and the extension pipe 51 can be easily separated from other components, reducing the maintenance cost and time.

[0044] By ensuring the accuracy and tightness of the connection, the design of the docking area 52 helps to guarantee the performance of the entire flue gas treatment system. Stable connection and good sealing can ensure that the flue gas flows along the predetermined path, enabling the high-temperature flue gas bypass valve 4 to accurately heat the flue gas, and the SCR denitration system 6 to efficiently carry out denitration treatment, thereby improving the flue gas treatment efficiency and denitration effect of the entire system.

[0045] The shunt plate 7 includes a plate body 72, and guide holes are arranged at equal intervals on the outer side of the plate body 72 for guiding the flue gas to pass through.

[0046] On the other side of the plate body 72, a convex ring is arranged in the middle, and one or more high-temperature steam hollow plates 71 are arranged in the middle of the inner side of the convex ring for dedusting the passing flue gas.

[0047] One or more air outlet holes 73 are arranged on the outer side of the high-temperature steam hollow plate 71 for spraying high-temperature steam.

[0048] In the flue gas treatment component for boiler SCR transformation, when the flue gas after preliminary treatment by the economizer and temperature adjustment by the high-temperature flue gas bypass valve 4 enters the extension pipe 51 of the dedusting and temperature-raising component 8, the shunt plate 7 begins to play its key role.

[0049] The shunt plate 7 is precisely fixed through the positioning convex ring 55 in the inner cavity 56 of the extension pipe 51. During the installation process, technicians need to ensure that the plate body 72 of the shunt plate 7 is closely attached to the positioning convex ring 55 to ensure that the shunt plate 7 can still remain stable under the impact of high-speed flue gas. After installation, the shunt plate 7 reasonably divides the inner cavity 56 space of the entire extension pipe 51, enabling the flue gas to pass through orderly.

[0050] The guiding holes are equidistantly spaced on the outer side of the plate body 72, and their diameters and spacings are precisely calculated and experimentally verified. When the flue gas enters the extension pipe 51 and contacts the flow dividing plate 7, these guiding holes will evenly disperse the flue gas. For example, for flue gas with different flow rates and velocities, the guiding holes can divide the flue gas into multiple smaller airflows according to its characteristics, avoiding the formation of eddies or turbulence in local areas, enabling the flue gas to pass through the flow dividing plate 7 more smoothly, and creating good conditions for subsequent dust reduction and temperature increase treatments.

[0051] The convex ring in the middle of the other side of the plate body 72 plays a role in fixing and supporting the high-temperature steam hollow plate 71. The high-temperature steam hollow plate 71 is filled with high-temperature steam, which is provided by a dedicated steam supply system. When the flue gas passes through the guiding holes, it will enter the area where the high-temperature steam hollow plate 71 is located.

[0052] The air outlet holes 73 opened on the outer side of the high-temperature steam hollow plate 71 will eject high-temperature steam. The high-temperature steam collides with and adsorbs the dust particles in the flue gas. On the one hand, the humidity of the high-temperature steam can cause the dust particles to agglomerate and become larger, making them easier to capture; on the other hand, the heat of the high-temperature steam can cause some volatile pollutants to decompose or transform. For example, for some fine dust particles, the high-temperature steam can moisten their surfaces, increase their weights, and make them settle more easily under the action of gravity. At the same time, the ejection of the high-temperature steam can also, to a certain extent, destroy the agglomeration structure of the dust particles in the flue gas, making the dust reduction effect more significant.

[0053] The entire flue gas treatment component is a system that operates in coordination. The control system will regulate the steam supply system according to the real-time parameters of the flue gas, such as temperature, flow rate, dust content, etc. When the dust content in the flue gas is relatively high, the control system will increase the supply of high-temperature steam, causing more high-temperature steam to be ejected from the air outlet holes 73 to improve the dust reduction efficiency; when the flue gas temperature is relatively low, the ejection of the high-temperature steam can also play a certain role in increasing the temperature, ensuring that the flue gas entering the SCR denitration system 6 meets the optimal working conditions.

[0054] The setting of the guiding holes enables the flue gas to pass through the flow dividing plate 7 evenly, avoiding local accumulation and disordered flow of the flue gas in the pipeline. This helps to improve the effects of subsequent dust reduction and temperature increase treatments, making the entire flue gas treatment process more stable and efficient. The uniform flue gas distribution can also reduce the local impact on the catalyst of the SCR denitration system 6 and extend the service life of the catalyst.

[0055] The design of the high-temperature steam hollow plate 71 and the air outlet holes 73 achieves an efficient dust reduction function. By injecting high-temperature steam, it can effectively capture and agglomerate dust particles in the flue gas, reducing the dust content in the flue gas. This not only protects the catalyst of the SCR denitration system 6 from being covered by dust and becoming ineffective, but also reduces the wear and blockage of subsequent equipment (such as air preheaters, bag filters, etc.), improving the reliability and operational stability of the entire flue gas treatment system.

[0056] The high-temperature steam hollow plate 71 not only has a dust reduction effect but also can increase the temperature of the flue gas to a certain extent. In the case of low-temperature flue gas, the heat of the high-temperature steam can increase the temperature of the flue gas to meet the requirements of the SCR denitration system 6 for the flue gas temperature. This multi-functional design reduces additional heating equipment, lowering the construction cost and operating energy consumption of the system.

[0057] The combination of the entire diverter plate 7 and the related systems with the control system makes the flue gas treatment process highly controllable. According to different flue gas conditions, it can adjust the supply quantity and injection method of high-temperature steam in real time to ensure the best dust reduction and temperature increase effects in various situations, improving the adaptability and flexibility of the system.

[0058] The dust reduction and temperature increase component 8 includes a dome 82, and one or more guide strips 83 are arranged in an annular array on the outer side of the dome 82 for dispersing the flue gas flowing through.

[0059] A groove is provided on the outer side of the guide strip 83, and an adhesion medium is filled in the groove for dust reduction treatment of the flue gas flowing through.

[0060] A heating component 81 is provided on one side of the dome 82, and the heating component 81 is distributed in an annular array on one side of the dome 82 for heating the flue gas flowing through.

[0061] A threaded groove 84 is provided at the bottom of the dome 82 near the guide strip 83 and the heating component 81 on one side for positioning the dome 82.

[0062] Internal threads are provided on the inner side of one of the positioning convex rings 55 for fixing the dome 82 in cooperation with the threaded groove 84 of the dome 82. Ventilation openings are provided on the outer side of the positioning convex ring 55, and the ventilation openings correspond to the guide strips 83 of the dome 82 one by one for guiding the flue gas to pass through.

[0063] In the flue gas treatment component for boiler SCR retrofit, the dust reduction and temperature increase component 8 is installed in the extension pipe 51 connecting the low-temperature economizer 3 and the SCR denitration system 6. It is an important treatment link before the flue gas enters the SCR denitration system 6, undertaking multiple tasks of dispersing, dust reducing, and temperature increasing the flue gas to ensure that the state of the flue gas entering the SCR denitration system 6 meets the requirements of efficient denitration.

[0064] When the flue gas that has been preliminarily treated by the economizer and diverted by the diverter plate 7 enters the dust reduction and temperature increase assembly 8, it first encounters the dome 82. The special shape of the dome 82 can change the flow direction of the flue gas, causing it to spread around. The guide strips 83 arranged in an annular array on the outer side of the dome 82 further disperse the flue gas.

[0065] For example, in the case of high-flow flue gas, the guide strips 83 can evenly disperse the flue gas into multiple smaller airflows, preventing the flue gas from concentrating in the center of the pipeline, so that the flue gas is more evenly distributed across the cross-section of the entire extension pipe 51. This is not only beneficial for subsequent dust reduction and temperature increase treatments, but also reduces the impact of the flue gas on the pipeline wall and decreases the wear of the pipeline.

[0066] The grooves on the outer side of the guide strips 83 are filled with an adhesion medium, such as viscous resin or special adsorption materials. When the dispersed flue gas passes through the guide strips 83, the dust particles in it will come into contact with the adhesion medium and be adsorbed. As the flue gas continues to flow, more and more dust is adhered in the grooves, effectively reducing the dust content in the flue gas.

[0067] To ensure the dust reduction effect, the adhesion medium needs to be replaced or supplemented regularly. An openable maintenance port can be set on the extension pipe 51 to facilitate the inspection and maintenance of the guide strips 83 by the staff. When replacing the adhesion medium, the staff can use special tools to remove the old medium and then fill in the new adhesion medium.

[0068] The heating assembly 81 distributed in an annular array on one side of the dome 82 is usually heated by means of electric heating wires or high-temperature steam coils, etc. When the dispersed and preliminarily dust-reduced flue gas passes through the heating assembly 81, the heating assembly 81 will transfer heat to the flue gas, raising the temperature of the flue gas to the optimal operating temperature range required by the SCR denitration system.

[0069] The control system will automatically adjust the power of the heating assembly 81 or the steam flow according to the real-time temperature of the flue gas and the operating requirements of the SCR denitration system 6. For example, when the flue gas temperature is low, the control system will increase the power of the heating assembly 81 to speed up the heating rate of the flue gas; when the flue gas temperature approaches the optimal operating temperature, the control system will appropriately reduce the heating power to maintain the stability of the flue gas temperature.

[0070] The dome 82 is fixed by the threaded fit between the threaded groove 84 and the inner thread of the positioning convex ring 55. When installing the dome 82, the staff needs to align the threaded groove 84 of the dome 82 with the thread of the positioning convex ring 55, and then rotate the dome 82 to firmly fix it on the positioning convex ring 55. The ventilation openings provided on the outer side of the positioning convex ring 55 correspond one by one to the guide strips 83 of the dome 82, ensuring that the flue gas can smoothly pass through the guide strips 83 and the ventilation openings and enter the next treatment step.

[0071] The entire dust reduction and temperature increase component 8 operates in coordination with other parts of the flue gas treatment component. During operation, the monitoring device will monitor parameters such as the temperature, flow rate, and dust content of the flue gas in real time, and feedback this data to the control system. The control system makes real-time adjustments to the high-temperature flue gas bypass valve 4, steam supply system, heating component 81, etc. according to the feedback information to ensure the efficient and stable operation of the entire flue gas treatment process.

[0072] The design of the dome 82 and the guide strips 83 can effectively disperse the flue gas evenly, making the distribution of the flue gas in the pipeline more reasonable. This not only improves the effect of subsequent dust reduction and temperature increase treatment, but also reduces the local wear of the pipeline and equipment by the flue gas, and extends the service life of the equipment.

[0073] The adhesion medium in the grooves of the guide strips 83 can adsorb the dust particles in the flue gas, significantly reducing the dust content in the flue gas. This helps to protect the catalyst of the SCR denitration system, prevent the catalyst from being covered by dust and reducing its activity, and improves the denitration efficiency and stability of the SCR denitration system.

[0074] The annular array distribution of the heating component 81 and the precise control of the control system can ensure that the flue gas is accurately heated to the optimal working temperature required by the SCR denitration system when passing through the dust reduction and temperature increase component 8. This improves the efficiency of the SCR denitration reaction, reduces the emission of nitrogen oxides, and meets the environmental protection requirements.

[0075] The dome 82 is fixed through the cooperation of the threaded groove 84 and the positioning convex ring 55. The installation process is simple and convenient, and the fixation is firm. The corresponding design of the ventilation port and the guide strips 83 ensures the smooth flow of the flue gas, and also improves the structural stability of the entire dust reduction and temperature increase component 8.

[0076] The dust reduction and temperature increase component 8 operates in coordination with other parts of the flue gas treatment component. Through the real-time control of the monitoring device and the control system, it can make dynamic adjustments according to the actual situation of the flue gas, making the operation of the entire flue gas treatment system more efficient, stable and reliable.

[0077] The above description is only for the implementation manner of the present invention and is not used to limit the present invention. For those skilled in the art, various changes and modifications can be made to the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the scope of the claims of the present invention.

Claims

1. A flue gas treatment component for the SCR retrofit of a boiler, comprising a high-temperature economizer (1) for treating flue gas and a low-temperature economizer (3) provided at one end of the high-temperature economizer (1). Both ends of the high-temperature economizer (1) are connected to the low-temperature economizer (3) through flue ducts (2). It is characterized in that: One end of the low-temperature economizer (3) is provided with an SCR denitration system (6). The SCR denitration system (6) is connected to the low-temperature economizer (3) through a dust reduction and heat preservation component (5). One end of the dust reduction and heat preservation component (5) is provided with a high-temperature flue gas bypass valve (4). The high-temperature flue gas bypass valve (4) heats up the flue gas flowing through the inside of the dust reduction and heat preservation component (5). The dust reduction and heat preservation component (5) is connected to the SCR denitration system (6). The dust reduction and heat preservation component (5) includes an extension pipe (51). An inner cavity (56) is provided inside the extension pipe (51). One or more positioning convex rings (55) are provided inside the inner cavity (56). The positioning convex rings (55) are used to fix the flow distribution plate (7) and the dust reduction and temperature increase component (8).

2. The flue gas treatment component for boiler SCR retrofit according to claim 1, characterized in that: Docking areas (52) are provided at both ends of the extension pipe (51). Positioning holes (53) are opened on the outer side of the docking areas (52). Sealing rings (54) are provided at the outer side of the positioning holes (53) at the docking areas (52) for connecting the high-temperature flue gas bypass valve (4) and the SCR denitration system (6).

3. A flue gas treatment component for boiler SCR retrofit according to claim 1, characterized in that: The flow distribution plate (7) includes a plate body (72). Guide holes are provided at equal intervals on the outer side of the plate body (72) for guiding the flue gas to pass through.

4. The flue gas treatment component for boiler SCR retrofit according to claim 3, characterized in that: A convex ring is provided in the middle of the other side of the plate body (72). One or more high-temperature steam hollow plates (71) are provided in the middle of the inner side of the convex ring for dust reduction treatment of the passing flue gas.

5. The flue gas treatment component for boiler SCR retrofit according to claim 4, characterized in that: One or more air outlet holes (73) are opened on the outer side of the high-temperature steam hollow plate (71) for spraying high-temperature steam.

6. The flue gas treatment component for boiler SCR retrofit according to claim 1, characterized in that: The dust reduction and temperature increase component (8) includes a dome (82). One or more flow guiding strips (83) are arranged in an annular array on the outer side of the dome (82) for dispersing the passing flue gas.

7. A flue gas treatment component for boiler SCR retrofit according to claim 6, characterized in that: A groove is provided on the outer side of the flow guiding strip (83). An adhesion medium is filled in the groove for dust reduction treatment of the passing flue gas.

8. The flue gas treatment component for boiler SCR retrofit according to claim 6, characterized in that: A heating component (81) is provided on one side of the dome (82). The heating component (81) is distributed in an annular array on one side of the dome (82) for heating the passing flue gas.

9. The flue gas treatment component for boiler SCR retrofit according to claim 6, wherein: A threaded groove (84) is provided at the bottom of one side of the dome (82) near the flow guiding strip (83) and the heating component (81) for positioning the dome (82).

10. A flue gas treatment component for boiler SCR retrofit according to claim 1, characterized in that: Threads are provided inside one of the positioning convex rings (55) for fixing the dome (82) in cooperation with the threaded groove (84) of the dome (82). Ventilation openings are opened on the outer side of the positioning convex ring (55). The ventilation openings correspond to the flow guiding strips (83) of the dome (82) one by one for guiding the flue gas to pass through.

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