An air preheating system arrangement

Abstract

The utility model discloses an air preheating system arrangement structure, including air preheater, be provided with flue gas warm air blower below air preheater, and the vertical arrangement of heat exchange pipe of flue gas warm air blower, and the flue gas import of flue gas warm air blower is connected air preheater through flue one, is provided with flue one at the air export of flue gas warm air blower, is provided with flue two at the flue gas export of flue gas warm air blower, and the air import of flue gas warm air blower is provided with flue two, and flue two is located the bottom of flue gas warm air blower, and flue one is arranged in the side of flue gas warm air blower and is located below air preheater. The utility model discloses the flue and flue structure of connecting flue gas warm air blower and the land space is small, especially the flue and flue of air side are very short, and the fluid resistance in flue and flue is small, and the fluid stability is good, and the wear and tear of fluid in flue and flue is small.

Description

Technical Field

[0001] This utility model relates to the technical field of flue gas systems for coal-fired boilers, and specifically to an air preheating system layout structure. Background Technology

[0002] Existing document CN222760916U discloses a flue gas bypass system for increasing the overall cold-end temperature of a rotary air preheater in a boiler. This system includes a rotary air preheater and a flue gas heater installed in a flue gas heater system. A hot flue gas bypass pipe is provided at the inlet flue of the rotary air preheater. The lower end of the hot flue gas bypass pipe is connected to the primary air side flue gas tube box of the flue gas heater, used to introduce a portion of the high-temperature flue gas fed into the rotary air preheater into the primary air side flue gas tube box to heat the primary air side flue gas tube box of the flue gas heater. The hot flue gas bypass pipe includes a main pipe, with multiple branch pipes arranged side-by-side at the lower end of the main pipe, and the branch pipes are connected to the primary air side flue gas tube box of the heater. By heating the primary air side tube box of the heater with high-temperature flue gas, the cold-end wall temperature of the primary air side of the rotary air preheater is increased, solving the problem of ammonium bisulfate ash blockage in the rotary air preheater.

[0003] As mentioned earlier, air preheating systems that install flue gas heaters downstream of rotary air preheaters are quite common. However, existing duct and flue structures that connect to the flue gas heaters occupy a large space, have high fluid resistance, and poor fluid stability. Utility Model Content

[0004] In order to at least solve the problems mentioned in the background art, the present invention aims to provide an air preheating system layout structure.

[0005] The present invention adopts the following technical solution.

[0006] An air preheating system layout includes an air preheater, a flue gas heater located below the air preheater, and the heat exchange tubes of the flue gas heater being arranged vertically. The flue gas inlet of the flue gas heater is connected to the air preheater via a flue duct 1. A duct 1 is located at the air outlet of the flue gas heater, and a second flue duct is located at the flue gas outlet of the flue gas heater. The air inlet of the flue gas heater is also connected to a second duct, which is located at the bottom of the flue gas heater. The first duct is located to the side of the flue gas heater and below the air preheater.

[0007] Furthermore, it also includes a flue gas dry-burning system, the damper of which is located at the top of the flue gas heater. The flue gas dry-burning system is used to introduce high-temperature flue gas into the heat exchange tubes of the flue gas heater.

[0008] Furthermore, a blower is installed on the second air duct.

[0009] To further reduce fluid resistance within the flue, flue 2 has a horizontal flue section and a vertical flue section. The horizontal flue section and the vertical flue section are connected only by elbows, and the width of the horizontal flue section is no greater than the width of the flue gas heater.

[0010] Furthermore, the second air duct has a horizontal air duct section and a vertical air duct section. The vertical air duct section is basically equal to the outer diameter of the horizontal air duct section, and the horizontal air duct section is located below the horizontal air duct section.

[0011] Preferably, the air duct and the vertical flue section are located on the left and right sides of the flue gas heater.

[0012] To further reduce the footprint of the air preheating system, the outer contour of the air duct is basically flush with the outer edge of the air preheater in the same vertical area.

[0013] To make the air preheating system layout more compact, each pair of symmetrically arranged air ducts is located outside the two adjacent sets of flue gas heaters, and two adjacent air ducts are arranged between the two sets of adjacent flue gas heaters.

[0014] Beneficial effects: Compared with the existing duct and flue structure for connecting flue gas heaters, the duct and flue structure for connecting flue gas heaters in this utility model occupies less space, especially the air-side duct and flue are very short, the fluid resistance in the duct and flue is small, the fluid stability is good, and the wear of the fluid on the duct and flue is small. Attached Figure Description

[0015] Figure 1 This is a schematic diagram (plan layout) of the air preheating system in Example 1. Figure 2 This is a schematic diagram (side view) of the air preheating system layout in Example 1. Figure 3 This is a schematic diagram (top view) of the flue gas dry-burning system in Example 1, showing the air preheating system layout. Figure 4 This is a schematic diagram of the air duct 2 in the air preheating system layout structure of Example 1; Figure 5 This is a schematic diagram of the second flue of the air preheating system layout structure in Example 1. Detailed Implementation

[0016] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model. Example 1

[0017] Combination Figures 1 to 5 As shown, an air preheating system layout includes an air preheater 7, with a flue gas heater 4 positioned below it. The heat exchange tubes of the flue gas heater 4 are arranged vertically. The flue gas inlet of the flue gas heater 4 is connected to the air preheater 7 via a first flue 6. A first air duct 8 is located at the air outlet of the flue gas heater 4, and a second flue duct 3 is also located at the flue gas outlet. A second air duct 2 is located at the air inlet of the flue gas heater 4, situated at its bottom. The first air duct 8 is located to the side of the flue gas heater 4 and below the air preheater 7. The system also includes a flue gas dry-burning system 5, with a baffle valve located at the top of the flue gas heater 4. The flue gas dry-burning system 5 is used to introduce high-temperature flue gas into the heat exchange tubes of the flue gas heater 4. A blower 1 is installed on the second air duct 2.

[0018] In this embodiment, combined with Figure 2 and Figure 5 As shown, flue 2 3 has a horizontal flue section 31 and a vertical flue section 32. The horizontal flue section 31 and the vertical flue section 32 are connected only by a 90-degree bend. The width of the horizontal flue section 31 is no greater than the width of the flue gas heater 4. (Combined with...) Figure 2 and Figure 4 As shown, the second air duct 2 has a horizontal air duct section 21 and a vertical air duct section 22. The vertical air duct section 22 is basically equal to the outer diameter of the horizontal flue section 31, and the horizontal air duct section 21 is located below the horizontal flue section 31. Among them, the first air duct 8 and the vertical flue section 32 are located on the left and right sides of the flue gas heater 4.

[0019] In this embodiment, within the same vertical region 9, the outer contour of duct 1 8 is substantially flush with the outer edge of the air preheater 7. Each pair of symmetrically arranged ducts 1 8 is located outside two adjacent sets of flue gas heaters 4, and two closely spaced ducts 2 are arranged between the two sets of adjacent flue gas heaters 4. Figure 1 In the scheme shown, there are two sets of two symmetrically arranged air ducts 8 located outside the two adjacent flue gas heaters 4.

[0020] Compared to existing duct and flue structures connecting to flue gas heaters (such as the heater assembly and boiler exhaust and intake system in document CN216481081U), the duct and flue structure in this embodiment occupies less space. In particular, the length of the air-side duct and flue can be shortened by about half, reducing fluid resistance within the duct and flue by about half, resulting in better fluid stability and less wear from the fluid. Furthermore, the air preheating system in this embodiment has a simple layout and is easy to install and disassemble.

Claims

1. An air preheating system layout structure, comprising an air preheater (7), characterized in that: A flue gas heater (4) is installed below the air preheater (7), and the heat exchange tubes of the flue gas heater (4) are arranged vertically. The flue gas inlet of the flue gas heater (4) is connected to the air preheater (7) through flue duct one (6). A duct one (8) is installed at the air outlet of the flue gas heater (4), and a duct two (3) is installed at the flue gas outlet of the flue gas heater (4). A duct two (2) is installed at the air inlet of the flue gas heater (4). The duct two (2) is located at the bottom of the flue gas heater (4), and the duct one (8) is arranged on the side of the flue gas heater (4) and below the air preheater (7).

2. The air preheating system layout structure according to claim 1, characterized in that: It also includes a flue gas dry burning system (5), the baffle of which is located at the top of the flue gas heater (4). The flue gas dry burning system (5) is used to introduce high-temperature flue gas into the heat exchange tube of the flue gas heater (4).

3. The air preheating system layout structure according to claim 1, characterized in that: A blower (1) is installed on the second (2) air duct.

4. The air preheating system layout structure according to any one of claims 1-3, characterized in that: The second flue (3) has a horizontal flue section (31) and a vertical flue section (32). The horizontal flue section (31) and the vertical flue section (32) are connected only by an elbow. The width of the horizontal flue section (31) is not greater than the width of the flue gas heater (4).

5. The air preheating system layout structure according to claim 4, characterized in that: The second air duct (2) has a horizontal air duct section (21) and a vertical air duct section (22). The vertical air duct section (22) is basically equal to the outer diameter of the horizontal flue section (31). The horizontal air duct section (21) is located below the horizontal flue section (31).

6. The air preheating system layout structure according to claim 5, characterized in that: The air duct (8) and the vertical flue section (32) are located on the left and right sides of the flue gas heater (4).

7. The air preheating system layout structure according to claim 6, characterized in that: In the same vertical area (9), the outer contour of the air duct (8) is basically flush with the outer edge of the air preheater (7).

8. The air preheating system layout structure according to any one of claims 5-7, characterized in that: Two symmetrically arranged air ducts (8) are located outside two adjacent sets of flue gas heaters (4), and two adjacent air ducts (2) are arranged between the two sets of adjacent flue gas heaters (4).

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