SCR denitration combined soot blowing system

Abstract

The utility model relates to the technical field of industrial flue gas treatment, provide a kind of SCR denitration combined soot blower system, including reactor, the reactor inside is arranged catalyst bed, the sound wave soot blower and harrow type steam soot blower are sequentially arranged above each catalyst bed, first pressure detection device is arranged above the catalyst bed, second pressure detection device is arranged below the catalyst bed.

Description

Technical Field

[0001] This utility model relates to the field of industrial flue gas treatment technology, specifically to an SCR denitrification combined soot blowing system. Background Technology

[0002] The catalyst is the core of SCR denitrification technology. In addition to its inherent active components, it is crucial to maintain the ambient temperature and specific surface area of ​​the catalyst during operation. Therefore, catalyst purging is an essential component of SCR denitrification technology. Currently, there are two main types of soot blowing technologies for SCR denitrification technology: steam soot blowers and sonic soot blowers.

[0003] SCR denitrification soot blowing technology is typically selected independently based on flue gas characteristics. In high-dust environments of cement clinker production lines, steam soot blowers are commonly used for SCR denitrification, achieving good results in soot removal. However, the high steam consumption impacts the thermal efficiency and power generation of downstream waste heat boilers, which cement companies consider unacceptable. Therefore, a combination of steam and acoustic soot blowing is proposed.

[0004] Due to the special nature of some boiler fuels, their flue gas has a high moisture content and the flue dust is highly viscous. Independent soot blowing technology makes the catalyst very easy to clog. This not only affects the denitrification efficiency of the catalyst, but in severe cases, it can also cause boiler shutdown, resulting in huge losses. In order to ensure that the entire catalyst bed surface is purged, the existing soot blowers are set at a certain distance from the catalyst bed. The soot blowers have insufficient purging force for flue dust and can only effectively blow away thin layers of accumulated flue dust. When the catalyst bed becomes clogged, it indicates that the flue dust has accumulated for a long time. At this time, the flue dust thickness has increased, and the existing fixed-position soot blowers cannot effectively clean the thicker flue dust. Utility Model Content

[0005] To achieve the above objectives, this utility model proposes an SCR denitrification combined soot blowing system, including a reactor. A catalyst bed is disposed inside the reactor. Above each catalyst bed, an acoustic soot blower and a rake-type steam soot blower are sequentially disposed. The rake-type steam soot blower includes an outlet cylinder extending inside the reactor. The end of the outlet cylinder is connected to an outlet via a telescopic hose. The top of the outlet is connected to a hydraulic cylinder via a hydraulic rod. The hydraulic cylinder is fixed to a support rod at the top of the outlet. A first pressure detection device, using an existing pressure sensor, is disposed above the catalyst bed. A second pressure detection device, also using an existing pressure sensor, is disposed below the catalyst bed.

[0006] Further configured, the first pressure detection device is fixed to the inner wall of the reactor and is centrally located above the catalyst layer. This central location ensures the representativeness and accuracy of the collected upstream pressure data.

[0007] Further configured, the second pressure detection device is fixed to the inner wall of the reactor, and the second pressure detection device is centrally located above the catalyst layer and centrally located below the catalyst layer, so that it can accurately measure the flue gas pressure in the central area downstream of the catalyst.

[0008] Further configured, the air outlet moves up and down along the catalyst bed under the push of the hydraulic rod. When the pressure difference between the second pressure detection device and the first pressure detection device is greater than a certain value, it indicates that the dust on the top surface of the catalyst bed has a certain thickness. At this time, the hydraulic cylinder is driven by the existing electrical system to push the hydraulic rod so that the air outlet is closer to the catalyst bed, so that the dust is more concentrated and the dust is subjected to a greater purging force. After vigorous purging, the dust thickness becomes thinner. When the pressure difference decreases to a certain value, the hydraulic rod drives the air outlet away from the catalyst bed, so that the dust receives a larger area of ​​purging.

[0009] A further configuration involves connecting a gun rod to an outlet cylinder located outside the reactor. The gun rod is fixedly mounted on a support frame, providing a robust external load-bearing foundation and reference point for the entire sootblower system.

[0010] Further configured, the gas outlet has several gas outlets. Compared with traditional single-point or double-point purging, the design of multiple gas outlets allows high-pressure steam to be sprayed onto a larger area of ​​catalyst surface simultaneously and evenly, achieving surface and comprehensive purging.

[0011] A further configuration is made whereby the acoustic soot blower includes a soot hopper, which is positioned toward the first pressure detection device, and the soot hopper serves to collect and guide acoustic wave energy. This specific orientation toward the first pressure detection device has significant preventative maintenance implications.

[0012] Further configured, the air outlet is located above the first pressure detection device. When high-pressure steam purging is started, the ejected steam and blown-up ash will move downward along the airflow direction, avoiding the direct scouring or reverse flow of high-temperature, high-speed steam and ash into the pressure measuring hole of the first pressure detection device.

[0013] A further configuration is that the acoustic soot blower is connected to a compressed air pipeline, which is connected to a compressed air source, providing powerful blowing energy for the acoustic soot blower.

[0014] A further configuration is that the rake-type steam soot blower is connected to a steam pipe, which is connected to a steam source, thus providing powerful purging energy to the rake-type soot blower.

[0015] The beneficial effects of one or more of the above technical solutions: The utility model uses a rake-type steam soot blower and a differential pressure detection device for interlocking. A first pressure sensor is installed below the sonic soot blower and the rake-type steam soot blower, and a second pressure sensor is also installed at the bottom of the reactor. The first and second pressure sensors adjust according to the differential pressure data, resulting in a high degree of automation. When the catalyst differential pressure increases, the blowing frequency of the steam soot blower is increased. To handle thicker soot, when the differential pressure between the second and first pressure detection devices exceeds a certain value, it indicates that the soot on the top surface of the catalyst bed has a certain thickness. At this time, the existing electrical system drives the hydraulic cylinder to push the hydraulic rod, bringing the air outlet closer to the catalyst bed, so that the soot is purged more concentratedly and with greater purging force. After vigorous purging, the soot thickness becomes thinner. When the differential pressure decreases to a certain value, the hydraulic rod moves the air outlet away from the catalyst bed, thus allowing the soot to be purged over a larger area. This design effectively purifies both thicker soot and thinner soot over a larger area, achieving efficient soot removal. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute a limitation thereof.

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] In the diagram, 1 represents the catalyst bed; 2 represents the acoustic soot blower. 3. Rake-type steam soot blower; 31. Air outlet; 32. Support rod; 33. Gun rod; 34. Support frame; 35. Air outlet; 4. First pressure detection device; 41. Second pressure detection device; 5. Compressed air pipeline; 6. Steam pipeline; 7. Reactor; 8. Soot blowing hopper. Detailed Implementation

[0019] The specific implementation of this embodiment will now be described with reference to the accompanying drawings.

[0020] Reference Figure 1 A combined SCR denitrification and soot blowing system, referring to Figure 1The system includes a reactor, inside which a catalyst bed is arranged. Above each catalyst bed layer, an acoustic sootblower and a rake-type steam sootblower are arranged sequentially. The rake-type steam sootblower includes an outlet cylinder extending into the reactor. The end of the outlet cylinder is connected to an outlet via a telescopic hose. The top of the outlet is connected to a hydraulic cylinder via a hydraulic rod. The hydraulic cylinder is fixed to a support rod at the top of the outlet. The rake-type steam sootblower uses a first pressure detection device above the catalyst bed, which employs an existing air pressure sensor. A second pressure detection device, also employing an existing air pressure sensor, is located below the catalyst bed, thus achieving intelligent and precise sootblowing strategy. By integrating the acoustic sootblower 2 (for daily, high-frequency loose purging) and the rake-type steam sootblower 3 (for periodic, high-intensity, high-energy purging) above each catalyst bed, a synergistic sootblowing mode of "acoustic prevention as the main method and steam unblocking as a supplementary method" is formed.

[0021] The first pressure detection device 4 is fixed to the inner wall of the reactor 7. The device is centrally positioned above the catalyst layer, ensuring stable installation and allowing it to withstand vibrations, high temperatures, and corrosive environments within the reactor 7. This centrally positioned arrangement above the catalyst layer offers significant advantages.

[0022] The second pressure detection device 41 is fixed to the inner wall of the reactor 7. Centered above the catalyst layer, similar to the first pressure detection device 4, its fixation to the inner wall ensures reliability. Its central placement below the catalyst layer allows for accurate measurement of the flue gas pressure in the central downstream region of the catalyst. The symmetrical arrangement of the two sensors in space ensures that their pressure measuring holes are located near the same streamline, minimizing measurement errors caused by uneven or skewed flue gas flow.

[0023] The rake-type steam soot blower 3 includes an exhaust pipe 31 extending inside the reactor 7. The exhaust pipe 31 is fixed to the reactor 7 by a support rod 32. The exhaust pipe 31 is the core component for performing steam injection operations, and its deep-penetration design ensures that high-pressure steam can cover the effective area of ​​the catalyst bed 1. The support rod 32 securely fixes it inside the reactor 7, providing extremely high rigidity and stability. It effectively resists the enormous recoil generated during steam injection, preventing the soot blower from shaking or shifting during operation, thus ensuring the accuracy and consistency of the purging trajectory.

[0024] The exhaust pipe 31 located outside the reactor 7 is connected to the gun rod 33, which is fixedly installed on the support frame 34. The gun rod 33 is a key transition component connecting the steam source and the internal exhaust pipe 31, bearing the pressure of the steam and the weight of the pipeline. It is fixedly installed on the support frame 34, which can be suspended from the wall by a hanger (the hanger structure is not shown), providing a robust external load-bearing foundation and reference point for the entire sootblower system. This design not only shares the load borne by the reactor 7 wall, but more importantly, ensures that the positioning accuracy of the sootblower remains constant during start-up, shutdown, extension, and rotation, allowing the steam jet to accurately act on the preset position, achieving a comprehensive and uniform soot-cleaning effect and preventing dead zones in soot cleaning.

[0025] The exhaust cylinder 31 has several exhaust ports 35, the core effect of which is to achieve surface-level, comprehensive purging. Compared with traditional single-point or double-point purging, the design of multiple exhaust ports 35 allows high-pressure steam to be simultaneously and evenly sprayed onto a larger area of ​​the catalyst surface, forming a "steam curtain." This greatly improves the efficiency and coverage of a single purging, avoiding the problem of repeated over-purging of local areas while other areas are insufficiently cleaned.

[0026] The acoustic soot blower 2 includes a soot hopper 8, which is positioned facing the first pressure detection device 4. The soot hopper 8 serves to gather and guide acoustic energy. This specific orientation towards the first pressure detection device 4 has significant preventative maintenance implications. The pressure measuring hole of the first pressure detection device 4 is one of the most vulnerable points to clogging due to dust accumulation. This design ensures that when the acoustic soot blower 2 is operating, the powerful acoustic energy can directly and effectively act on the pressure measuring hole area, dislodging any fly ash that may accumulate around it, effectively preventing clogging of the pressure measuring hole and ensuring the smooth and accurate transmission of pressure sensing signals.

[0027] The outlet 35 is located above the first pressure detection device 4. Positioning the outlet 35 above the first pressure detection device 4 means that the steam purging flow direction is from top to bottom. The advantage of this layout is that when high-pressure steam purging is started, the ejected steam and blown-up ash will move downwards along the airflow direction, avoiding direct scouring or reverse inflow of high-temperature, high-speed steam and ash into the pressure measuring hole of the first pressure detection device 4.

[0028] The sonic soot blower 2 is connected to the compressed air pipeline 5, which is connected to a compressed air source. Using compressed air as the energy medium for the sonic soot blower 2 has multiple benefits: First, compressed air is relatively easy to obtain and is a common energy source in factories; second, compared with high-pressure steam, compressed air is dry and clean, and it does not increase the humidity of the flue gas after working inside the reactor 7, thus avoiding problems such as ash adhesion, condensation and corrosion that may be caused by introducing additional moisture; finally, the operating cost of compressed air is usually lower than that of steam.

[0029] The rake-type steam soot blower 3 is connected to the steam pipe 6, which is connected to a steam source, providing powerful purging energy to the rake-type soot blower. The high-pressure steam contains a large amount of thermal and kinetic energy, which can effectively and powerfully remove thick, sticky ash deposits.

[0030] The working principle is as follows: The acoustic soot blower 2 operates on a long-term, timed basis, using acoustic vibration to remove floating dust from the surface of catalyst 1. The rake-type steam soot blower 3 is interlocked with the differential pressure detection device 4, allowing for intermittent, constant-pressure operation. When the differential pressure rises, the rake-type steam soot blower is activated to blow away the dust adhering to the catalyst. The compressed air pipeline 5 provides the acoustic soot blower 2 with the necessary compressed air, and the steam pipeline 6 provides the steam blower 3 with the necessary steam. Compared to traditional single soot blowing methods, this invention not only better removes dust from the catalyst surface, reducing the risk of catalyst blockage and significantly extending catalyst lifespan, but also overcomes the shortcomings of single soot blowing methods. A single acoustic soot blower lacks sufficient blowing power and struggles to remove highly viscous dust, while frequent operation of a single rake-type steam soot blower can damage the catalyst. It is particularly effective for conditions with high flue gas moisture content and highly viscous dust. To improve the cleaning effect and handle thicker dust, when the pressure difference between the second and first pressure detection devices exceeds a certain value, it indicates that the dust on the top surface of the catalyst bed has a certain thickness. At this time, the existing electrical system drives the hydraulic cylinder to push the hydraulic rod, bringing the air outlet closer to the catalyst bed. This allows the dust to be more concentratedly purged and subjected to greater purging force. After vigorous purging, the dust thickness thins out. When the pressure difference decreases to a certain value, the hydraulic rod moves the air outlet away from the catalyst bed, allowing the dust to be purged over a larger area. This method effectively purifies both thicker dust and thinner dust over a larger area, thus effectively cleaning the dust.

[0031] Although the specific embodiments of the present utility model have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present utility model. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solution of the present utility model are still within the scope of protection of the present utility model.

Claims

1. A combined SCR denitrification and soot blowing system, characterized in that, The device includes a reactor, inside which a catalyst bed is arranged. Above each catalyst bed, an acoustic soot blower and a rake-type steam soot blower are arranged in sequence. The rake-type steam soot blower includes an exhaust cylinder extending inside the reactor. The end of the exhaust cylinder is connected to an exhaust port via a telescopic hose. The top of the exhaust port is connected to a hydraulic cylinder via a hydraulic rod. The hydraulic cylinder is fixed to a support rod at the top of the exhaust port. The rake-type steam soot blower has a first pressure detection device above the catalyst bed and a second pressure detection device below the catalyst bed.

2. The SCR denitrification combined soot blowing system according to claim 1, characterized in that, The first pressure detection device is fixed to the inner wall of the reactor and is centrally located above the catalyst layer.

3. The SCR denitrification combined soot blowing system according to claim 1, characterized in that, The second pressure detection device is fixed to the inner wall of the reactor and is centrally located above the catalyst layer.

4. The SCR denitrification combined soot blowing system according to claim 1, characterized in that, The gas outlet moves up and down along the catalyst bed under the push of the hydraulic rod.

5. The SCR denitrification combined soot blowing system according to claim 1, characterized in that, An exhaust pipe located outside the reactor is connected to a gun rod, which is fixedly mounted on a support frame.

6. The SCR denitrification combined soot blowing system according to claim 1, characterized in that, The air outlet has several air outlets.

7. The SCR denitrification combined soot blowing system according to claim 1, characterized in that, The acoustic soot blower includes a soot blowing hopper, which is positioned toward a first pressure detection device.

8. The SCR denitrification combined soot blowing system according to claim 1, characterized in that, The air outlet is located above the first pressure detection device.

9. The SCR denitrification combined soot blowing system according to claim 1, characterized in that, The sonic soot blower is connected to a compressed air pipeline, which in turn is connected to a compressed air source.

10. The SCR denitrification combined soot blowing system according to claim 1, characterized in that, The rake-type steam soot blower is connected to a steam pipeline, which in turn is connected to a steam source.

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