Mounting structure for compressed air heater in SCR (Selective Catalytic Reduction) denitration system

Abstract

The utility model discloses a mounting structure for a compressed air heater in an SCR (Selective Catalytic Reduction) denitration system, the compressed air heater is mounted in a reactor outlet of the SCR denitration system through a fixing assembly, and hot flue gas passes through from top to bottom and exchanges heat with the compressed air heater; the compressed air heater comprises a compressed air inlet distribution pipe, a compressed air outlet distribution pipe and a compressed air heat exchange pipe. The heat exchanger is arranged in the outlet section of the reactor, the longitudinal section of the section is of a big-end-up trapezoidal structure, space is sufficient, heat exchange pipelines are convenient to arrange, heat exchange efficiency is improved, pipeline resistance is reduced, the heat exchanger is embedded into the outlet of the reactor, the heat exchanger and the reactor are combined into one, a shell plate of the heat exchanger section is omitted, and cost is reduced. The heat exchanger section shell and the expansion joint between the heat exchanger section shell and the reactor outlet section are arranged, the height space is fully utilized, the total height of equipment is reduced, an external steel support beam and a complex overhanging supporting beam structure in an original supporting mode are omitted, steel materials are saved, and meanwhile the structural stability is higher.

Description

Technical Field

[0001] The utility model belongs to the technical field of compressed air heating equipment installation structures, and in particular relates to an installation structure of a compressed air heater used in an SCR denitration system. Background Art

[0002] The catalyst used in SCR denitrification technology has a porous structure. When denitrifying dusty flue gases, particularly in the cement industry where dust concentrations are high, dust can settle and clog the catalyst pores. To ensure the proper and stable operation of the SCR denitrification system, dust must be removed from the catalyst surface simultaneously with denitrification to minimize dust accumulation. Therefore, a certain number of sootblowers are required for cleaning. Currently, rake sootblowers are the primary method of cleaning, using compressed air at a constant pressure to remove dust from the catalyst surface. The cleaning air source is heated compressed air. Currently, compressed air is heated using an air heater, which heats the high-temperature denitrification flue gas through convection on the walls of the heat exchange tubes with the room-temperature compressed air from the air compressor. The heated compressed air then passes through the rake sootblowers to clean the catalyst. Using hot compressed air for cleaning avoids the adverse effects of flue gas temperature reduction, which can affect denitrification efficiency and prevent condensation on the catalyst surface.

[0003] Existing air heaters commonly utilize reactor height limitations, resulting in a relatively low heat exchanger height, low heat utilization efficiency during convective heat transfer, and increased resistance when heat exchange tubes are densely packed. The air heater is located in a straight section of pipe connecting the outlet of the denitrification reactor, typically about 2 to 3 meters high. Depending on the flue gas temperature and the difference in compressed air temperature before and after heat exchange, a certain heat exchange area must be maintained to achieve the required heat transfer capacity. The cross-sectional area and layout height of the heat exchanger are determined by the flue gas-air contact time and convection velocity during heat exchange. To maximize heat exchange area, heat exchange tubes are arranged closely together, using a small-diameter design. This increases resistance within the heat exchange tubes and in the hot flue gas path. This results in significant compressed air pressure loss, impacting the sootblower's cleaning pressure and effectiveness, and increasing air compressor energy consumption. This sometimes necessitates the use of a higher-pressure-rating or higher-power air compressor, increasing procurement costs. Increased flue gas resistance within the reactor also increases energy consumption for the denitrification system's high-temperature blower, creating numerous operational inconveniences. If the equipment height of the heat exchanger section is increased, the investment cost of the overall steel structure support of the denitrification equipment will increase, and the economic efficiency will be reduced. Utility Model Content

[0004] In view of this, the main purpose of the present invention is to provide an installation structure for a compressed air heater in an SCR denitration system.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the utility model is achieved as follows:

[0006] Embodiment 1 of the present invention provides an installation structure for a compressed air heater in an SCR denitrification system, wherein the compressed air heater is installed in the reactor outlet of the SCR denitrification system through a fixing assembly, and hot flue gas passes from top to bottom to perform heat exchange with the compressed air heater, and the compressed air heater comprises a compressed air inlet distribution pipe, a compressed air outlet distribution pipe, and a compressed air heat exchange pipe, a row of air vents on the side of the compressed air inlet distribution pipe are connected one-to-one with the head ends of several columns of compressed air heat exchange pipes, and the ends of several columns of the compressed air heat exchange pipes are connected one-to-one with a row of air vents on the side of the compressed air outlet distribution pipe, and the several columns of the compressed air heat exchange pipes are arranged in parallel, and each column of the compressed air heat exchange pipes has a wide-upper-narrow-lower structure, which is used to adapt to the structure of the reactor outlet and is sealed and welded to the wall panel of the reactor outlet.

[0007] In the above scheme, the fixed assembly includes a support beam and a fixed frame. The support beam is arranged at the end of the reactor outlet, and the fixed frame is fixed on the support beam. The compressed air inlet distribution pipe, the compressed air outlet distribution pipe and the compressed air heat exchange pipe are all fixed on the fixed frame.

[0008] In the above solution, both ends of the support beam have inclined surfaces, and the inclined surfaces are connected to the reactor outlet.

[0009] In the above solution, the inclination angle of the inclined surface is adapted to the inclination angle of the inner wall of the reactor outlet, and is used for welding and fixing the support beam to the wall plate of the reactor outlet, so as to improve the bearing capacity of the support beam.

[0010] In the above solution, the compressed air intake distribution pipe is arranged outside the reactor outlet and is connected to an intake distribution pipe joint, and the intake distribution pipe joint is connected to the compressed air intake main pipe through a flange.

[0011] In the above solution, the compressed air outlet distribution pipe is arranged outside the reactor outlet and is connected to a gas outlet distribution pipe joint, and the gas outlet distribution pipe joint is connected to the compressed air outlet main pipe through a flange.

[0012] Compared with the prior art, the present invention arranges the heat exchanger in the outlet section of the reactor. The longitudinal cross-section of this section of space is a trapezoidal structure with a larger upper portion and a smaller lower portion. The space is ample and convenient for arranging the heat exchange pipeline, which is beneficial to improving the heat exchange efficiency and reducing the pipeline resistance. The heat exchanger is embedded in the reactor outlet, combining the two into one, eliminating the shell plate of the heat exchanger section and the expansion joint between the heat exchanger section shell and the reactor outlet section, making full use of the height space to reduce the total height of the equipment, eliminating the external steel support beam and the complex cantilever support beam structure of the original support method, which not only saves steel materials but also has higher structural stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The drawings described herein are used to further understand the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0014] Figure 1 This is a schematic diagram of the main structure of an installation structure for a compressed air heater in an SCR denitration system according to an embodiment of the present utility model;

[0015] Figure 2 This is a left-side structural schematic diagram of an installation structure for a compressed air heater in an SCR denitration system according to an embodiment of the present utility model;

[0016] Figure 3 This is a schematic diagram of a top view of the installation structure of a compressed air heater for an SCR denitrification system according to an embodiment of the utility model.

[0017] Figure 4 This is a structural diagram of the support beam described in an embodiment of the utility model. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0019] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0020] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, article, or device comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, article, or device comprising the element.

[0021] like Figure 1-Figure 4 As shown, embodiment 1 of the present invention provides an installation structure for a compressed air heater in an SCR denitrification system, wherein the compressed air heater is installed in the reactor outlet 1 of the SCR denitrification system through a fixing assembly, and the hot flue gas passes from top to bottom to perform heat exchange with the compressed air heater, and the compressed air heater comprises a compressed air inlet distribution pipe 3, a compressed air outlet distribution pipe 4, and a compressed air heat exchange pipe 11, a row of air vents on the side of the compressed air inlet distribution pipe 3 are connected one-to-one with the head ends of several columns of compressed air heat exchange pipes 11, and the ends of several columns of the compressed air heat exchange pipes 11 are connected one-to-one with a row of air vents on the side of the compressed air outlet distribution pipe 4, and several columns of the compressed air heat exchange pipes 11 are arranged in parallel, and each column of the compressed air heat exchange pipes has a wide upper and narrow lower structure, which is used to adapt to the structure of the reactor outlet 1, and is sealed and welded to the wall panel of the reactor outlet.

[0022] In the above solution, since the longitudinal cross-section of the reactor outlet 1 is a trapezoidal structure, the space of the reactor outlet 1 can be utilized to the maximum extent by setting the compressed air heat exchange pipe 11 to a structure that is wide at the top and narrow at the bottom.

[0023] like Figure 1-Figure 4 As shown, the fixed assembly includes a support beam 2 and a fixing frame 6. The support beam 2 is arranged at the end of the reactor outlet 1, and the fixing frame 6 is fixed on the support beam 2. The compressed air inlet distribution pipe 3, the compressed air outlet distribution pipe 4 and the compressed air heat exchange pipe 11 are all fixed on the fixing frame 6.

[0024] In the above solution, by setting the fixing frame 6 on the support beam 2, it is convenient to arrange the compressed air inlet distribution pipe 3, the compressed air outlet distribution pipe 4 and the compressed air heat exchange pipe 11 above the support beam 2.

[0025] like Figure 1-Figure 4 As shown, both ends of the support beam 2 have inclined surfaces 21 , and the inclined surfaces 21 are connected to the reactor outlet 1 .

[0026] like Figure 1-Figure 4As shown, the inclination angle of the inclined surface 21 is adapted to the inclination angle of the inner wall of the reactor outlet 1 , and is used for welding and fixing the support beam 2 to the wall plate of the reactor outlet 1 , so as to improve the bearing performance of the support beam 2 .

[0027] In the above scheme, by setting both ends of the support beam 2 as inclined surfaces 21, the inclined surface 21 is adapted to the inclination angle of the inner wall of the reactor outlet 1 at the lowest position, and the length of the support beam 2 is equal to the width of the lowest position of the reactor outlet 1, so that the support beam 2 is engaged at the lowest position of the reactor outlet 1, providing the largest installation space for the compressed air heat exchanger, and the inclined surface 21 is welded to the inner wall of the reactor outlet 1, which is convenient for fixing the support beam 2 and improving the load-bearing performance of the support beam 2.

[0028] like Figure 1-Figure 4 As shown, the compressed air intake distribution pipe 3 is arranged outside the reactor outlet 1 and is connected to an intake distribution pipe joint 7. The intake distribution pipe joint 7 is connected to the compressed air intake main pipe 8 through a flange 5.

[0029] like Figure 1-Figure 4 As shown, the compressed air outlet distribution pipe 4 is arranged outside the reactor outlet 1 and is connected to a gas outlet distribution pipe joint 9. The gas outlet distribution pipe joint 9 is connected to the compressed air outlet main pipe 10 through a flange 5.

[0030] In the above scheme, by connecting the air inlet distribution pipe joint 7 to the compressed air inlet distribution pipe 3 and the air outlet distribution pipe joint 9 to the compressed air outlet distribution pipe 4, it is convenient to connect with the compressed air inlet main pipe 8 of the external air compressor and the heated compressed air outlet main pipe 10.

[0031] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention.

Claims

1. A mounting structure for a compressed air heater in an SCR denitration system, characterized in that: The compressed air heater is installed in the reactor outlet of the SCR denitrification system through a fixed component. The hot flue gas passes from top to bottom and exchanges heat with the compressed air heater. The compressed air heater includes a compressed air inlet distribution pipe, a compressed air outlet distribution pipe, and a compressed air heat exchange pipe. A row of air vents on the side of the compressed air inlet distribution pipe are connected one-to-one with the head ends of several columns of compressed air heat exchange pipes. The ends of several columns of compressed air heat exchange pipes are connected one-to-one with a row of air vents on the side of the compressed air outlet distribution pipe. Several columns of compressed air heat exchange pipes are arranged in parallel. Each column of compressed air heat exchange pipes has a wide upper and narrow lower structure, which is used to adapt to the structure of the reactor outlet and is sealed and welded to the wall panel of the reactor outlet.

2. The installation structure for a compressed air heater in an SCR denitration system according to claim 1, characterized in that: The fixing assembly includes a support beam and a fixing frame. The support beam is arranged at the end of the reactor outlet. The fixing frame is fixed on the support beam. The compressed air inlet distribution pipe, the compressed air outlet distribution pipe and the compressed air heat exchange pipe are all fixed on the fixing frame.

3. The installation structure for the compressed air heater in the SCR denitration system according to claim 2, characterized in that: Both ends of the support beam are provided with inclined surfaces, and the inclined surfaces are connected with the reactor outlet.

4. The installation structure for a compressed air heater in an SCR denitration system according to claim 3, characterized in that: The inclination angle of the inclined surface is adapted to the inclination angle of the inner wall of the reactor outlet, and is used for welding and fixing the support beam to the wall plate of the reactor outlet, so as to improve the bearing performance of the support beam.

5. The installation structure for a compressed air heater in an SCR denitration system according to claim 4, characterized in that: The compressed air inlet distribution pipe is arranged outside the reactor outlet and is connected to an inlet distribution pipe joint, and the inlet distribution pipe joint is connected to the compressed air inlet main pipe through a flange.

6. The installation structure for a compressed air heater in an SCR denitration system according to claim 5, characterized in that: The compressed air outlet distribution pipe is arranged outside the reactor outlet and is connected to an outlet distribution pipe joint, and the outlet distribution pipe joint is connected to the compressed air outlet main pipe through a flange.

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