Anti-corrosion air preheater

Abstract

The utility model discloses an anti-corrosion air preheater, and relates to the technical field of boilers. The device comprises an outer protective shell and a connecting cylinder, an auxiliary mechanism used for increasing the temperature of external entering air is arranged in the outer protective shell, the auxiliary mechanism comprises a mounting cylinder, an inner sleeve, a water inlet pipe and a water outlet pipe, the mounting cylinder is located in the outer protective shell, a plurality of enamel-plated heat exchange pipes are mounted in the mounting cylinder, and the enamel-plated heat exchange pipes are used for exchanging heat with tail flue gas; the inner sleeve is located in the mounting cylinder and used for allowing external air to enter, and the end of the water inlet pipe is fixedly sleeved with a bent pipe. According to the air preheater, the mounting barrel, the inner sleeve, the cold air pipe, the water inlet pipe and the water outlet pipe are matched with one another, the mounting barrel conducts heat exchange operation on tail gas and flue gas, high-temperature water of the deaerator flows through the water inlet pipe, the bent pipe and the water outlet pipe, and cold air enters the inner sleeve to conduct heat exchange through the high-temperature water of the deaerator; and therefore, the entering temperature of external cold air can be increased.

Description

Technical Field

[0001] The utility model relates to the technical field of boilers, in particular to an anti-corrosion air preheater. Background Art

[0002] An air preheater is usually a commonly used preheating device. The air preheater preheats the flue gas at the tail end of the boiler through the internal heat dissipation fins to a certain temperature for the air before entering the boiler. The air preheater can usually be used to improve the heat exchange performance of the boiler and reduce energy consumption.

[0003] The air preheater of the prior art usually includes a heat exchange tube bundle, an external guard plate, an inlet end and an outlet end, etc. The heat exchange tube bundle is located inside the external guard plate, and the inlet end and the outlet end are respectively located at both ends of the heat exchange tube bundle. When in use, the external cold air is introduced into the cold air inlet end and then enters the heat exchange tube bundle for heat exchange operation.

[0004] When the external cold air enters the inlet end, the inlet end is at the lowest temperature of the air and the flue gas at this time. However, after long-term use of the air inlet end, there will be a situation where the cold air enters at a low temperature and causes the condensation of sulfuric acid vapor, resulting in the corrosion of the inlet end. Furthermore, it is not convenient for the air preheater to carry out preheating and anti-corrosion protection on the inlet end, and there are certain limitations. Content of the Utility Model

[0005] Aiming at the deficiencies of the prior art, the utility model provides an anti-corrosion air preheater, which solves the problems that the cold air enters the air inlet end of the air preheater, resulting in the corrosion of the air inlet end due to long-term low temperature and the condensation of sulfuric acid vapor.

[0006] To achieve the above purposes, the utility model is realized through the following technical solutions: an anti-corrosion air preheater, including an outer housing and a connecting cylinder. The connecting cylinder is fixedly connected to the side of the outer housing. An auxiliary mechanism for increasing the temperature of the externally entering air is arranged inside the outer housing. The auxiliary mechanism includes:

[0007] An installation cylinder, which is located inside the outer housing. A plurality of enamel-coated heat exchange tubes are installed inside the installation cylinder, and the enamel-coated heat exchange tubes are used for heat exchange with the tail flue gas.

[0008] An inner sleeve, which is located inside the installation cylinder and is used for allowing the external air to enter.

[0009] An inlet pipe and an outlet pipe. The end of the inlet pipe is fixedly sleeved with a bent pipe, and the end of the bent pipe is sleeved with the end of the outlet pipe. The inlet pipe is used for allowing the high-temperature water from the deaerator to pass through for heat exchange with the external air.

[0010] Preferably, two circular grooves are formed at the top end of the inner sleeve, the outer walls of the water inlet pipe and the water outlet pipe are respectively fixedly inserted and connected to the inner cavities of the two circular grooves, a cold air pipe is fixedly inserted and connected to the side part of the inner sleeve, and an air outlet pipe is fixedly inserted and connected to the other side part of the inner sleeve.

[0011] Preferably, a support column is fixedly connected to the inner wall of the installation cylinder, an arc-shaped plate is fixedly connected to the end of the support column, and a guide plate is fixedly connected to the outer wall of the inner sleeve.

[0012] Preferably, a guide groove is formed in the inner wall of the arc-shaped plate, the guide plate is slidably inserted and connected to the inner cavity of the guide groove, and the guide plate and the arc-shaped plate are used for sliding guidance of the installation of the inner sleeve.

[0013] Preferably, bearing plates are symmetrically and fixedly connected to the side part of the installation cylinder, a through groove is formed at the top end of the bearing plate, and a limiting rod is slidably inserted and connected to the inner cavity of the through groove.

[0014] Preferably, fixing cylinders are fixedly connected to both the top end and the bottom end of the inner sleeve, the limiting rod is slidably inserted and connected to the inner cavity of the fixing cylinder, and a locking bolt for locking the relative position of the limiting rod and the fixing cylinder is threadedly inserted through the outer wall of the fixing cylinder.

[0015] Preferably, assembly plates are fixedly connected to both the top end and the bottom end of the outer casing, positioning bolts are threadedly inserted between adjacent assembly plates, an assembly plate is fixedly connected to the side of one of the outer casings, an assembly groove matching with the assembly plate is formed in the side of the other outer casing, a support plate is fixedly connected to the inner wall of the outer casing, and the inner wall of the support plate is attached to the outer wall of the installation cylinder.

[0016] Preferably, positioning plates are symmetrically and fixedly connected to the outer wall of the outer casing, and support legs are fixedly connected to the bottom ends of the positioning plates.

[0017] The utility model discloses an anti-corrosion air preheater, and the beneficial effects thereof are as follows:

[0018] Through the mutual cooperation of the installation cylinder, the inner sleeve, the cold air pipe, the water inlet pipe and the water outlet pipe, the installation cylinder performs heat exchange operation on the tail gas flue gas, the inner sleeve allows cold air to enter into it, the water inlet pipe, the elbow pipe and the water outlet pipe enable the high-temperature water of the deaerator to flow, the cold air enters into the inner sleeve and is heat-exchanged by the high-temperature water of the deaerator, which is beneficial to increasing the inlet temperature of the external cold air, and then is heat-exchanged with the tail flue gas through the installation cylinder, facilitating the prevention of corrosion at the inlet end of the air preheater, enabling the heat-exchanged hot air to enter the boiler to accelerate the drying, ignition and combustion of the fuel, and facilitating the improvement of the combustion efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 Schematic diagram of the overall structure of the present invention;

[0021] Figure 2 Schematic diagram of the structure at the inner sleeve of the present invention;

[0022] Figure 3 For the present invention Figure 2 Enlarged schematic diagram of the structure at position A in the present invention;

[0023] Figure 4 For the present invention Figure 2 Enlarged schematic diagram of the structure at position B in the present invention.

[0024] In the figure: 1, outer protective shell; 2, connecting cylinder; 3, auxiliary mechanism; 31, installation cylinder; 32, inner sleeve; 33, cold air duct; 34, water inlet pipe; 35, water outlet pipe; 4, support leg; 5, bearing plate; 6, limiting rod; 7, fixing cylinder; 8, locking bolt; 9, guiding plate; 10, arc plate; 11, support column; 12, positioning plate. Detailed implementation manners

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described below. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0026] In the embodiments of the present application, by providing an anti-corrosion air preheater, the problem of corrosion caused by long-term low-temperature use at the inlet end of the air preheater is solved. By introducing high-temperature water from an external deaerator into the interior of the water inlet pipe 34, then the high-temperature water from the deaerator flows inside the elbow pipe, and finally is discharged through the water outlet pipe 35. Thus, the high-temperature water from the deaerator forms a flow pattern. Then, through the cooperation of an external fan and the cold air duct 33, external cold air directly enters the interior of the inner sleeve 32. Then, the elbow pipe exchanges heat with the external cold air to increase the temperature of the external cold air, and then enters the interior of the installation cylinder 31. The enamel-coated heat exchange pipes inside the installation cylinder 31 exchange heat with the flue gas at the tail, and then the preheated cold air is exchanged heat by the enamel-coated heat exchange pipes and then enters the interior of the boiler.

[0027] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings of the specification and specific embodiments.

[0028] An embodiment of the present utility model discloses an anti-corrosion air preheater.

[0029] According to the appendix Figure 1As shown in Fig. -4, it includes an outer protective shell 1 and a connecting cylinder 2. The protective shell 1 is beneficial to protecting the outside of the enamel-coated heat exchange tube and the inner sleeve 32. The connecting cylinder 2 is beneficial to shielding and protecting the end of the protective shell 1, and is also beneficial to docking with the corresponding equipment. The connecting cylinder 2 is fixedly connected to the side of the outer protective shell 1. An auxiliary mechanism 3 for increasing the temperature of the air entering from the outside is arranged inside the outer protective shell 1. The auxiliary mechanism 3 includes an installation cylinder 31, an inner sleeve 32, a water inlet pipe 34 and a water outlet pipe 35. The installation cylinder 31 is beneficial to installing and fixing the enamel-coated heat exchange tube, and is also beneficial to supporting and fixing the inner sleeve 32, facilitating the installation of the inner sleeve 32. The inner sleeve 32 is beneficial to allowing the outside cold air to directly enter its interior, facilitating the preheating operation of the outside cold air, and facilitating the anti-corrosion protection of the inlet end of the air condenser. The water inlet pipe 34 is beneficial to allowing the high-temperature water from the outside deaerator to pass through, then enter the interior of the elbow, and then flow out through the water outlet pipe 35, so that the high-temperature water of the deaerator forms a flowing state, and further allows the outside cold air to enter and exchange heat with the high-temperature water of the deaerator, exchanging heat with the outside cold air. The installation cylinder 31 is located inside the outer protective shell 1. A plurality of enamel-coated heat exchange tubes are installed inside the installation cylinder 31, which is beneficial to allowing the tail gas to enter its interior to conduct heat exchange on the tail gas, exchange heat with the preheated air, make the air reach the corresponding temperature, accelerate the drying, ignition and combustion of the fuel in the boiler, and facilitate improving the combustion efficiency. The enamel-coated heat exchange tubes are located on the side of the inner sleeve 32, and the enamel-coated heat exchange tubes are connected to the inner wall of the installation cylinder 31 through brackets (not shown in the figure). The ends of the enamel-coated heat exchange tubes are connected to the corresponding equipment through pipelines. The enamel-coated heat exchange tubes are used for heat exchange with the tail gas. The inner sleeve 32 is located inside the installation cylinder 31 and is used to allow the outside air to enter. The end of the water inlet pipe 34 is fixedly sleeved with an elbow, which is beneficial to allowing the high-temperature water of the deaerator to flow inside it, and making the outside cold air exchange heat with the high-temperature water of the deaerator. The elbow is fixed by the water inlet pipe 34 and the water outlet pipe 35. The elbow is made of heat exchange tube material and is designed in a U shape or other shapes, allowing the air to enter and contact the outer wall of the elbow to raise the temperature of the cold air. The end of the elbow is sleeved with the end of the water outlet pipe 35. The water inlet pipe 34 is used to allow the high-temperature water of the deaerator to pass through to conduct heat exchange with the outside air. Two circular grooves are opened at the top of the inner sleeve 32. The outer walls of the water inlet pipe 34 and the water outlet pipe 35 are respectively fixedly inserted and connected to the inner cavities of the two circular grooves. A cold air pipe 33 is fixedly inserted and connected to the side of the inner sleeve 32, which is beneficial to directly connecting the outside fan to the inner sleeve 32, allowing the cold air to directly enter the interior of the inner sleeve 32. Another side of the inner sleeve 32 is fixedly inserted and connected with an air outlet pipe, facilitating the discharge of the preheated air to contact the enamel-coated heat exchange tube for heat exchange operation.

[0030] Specifically, a support column 11 is fixedly connected to the inner wall of the installation cylinder 31, which is beneficial to support the arc-shaped plate 10. The end of the support column 11 is fixedly connected to the arc-shaped plate 10, which is beneficial to connect with the guide plate 9, and further beneficial to slidably install the inner sleeve 32 inside it. A guide plate 9 is fixedly connected to the outer wall of the inner sleeve 32. A guide groove is formed in the inner wall of the arc-shaped plate 10. The guide plate 9 is slidably inserted into the inner cavity of the guide groove. The guide plate 9 and the arc-shaped plate 10 are used to slidably guide the installation of the inner sleeve 32.

[0031] Specifically, bearing plates 5 are symmetrically and fixedly connected to the side of the installation cylinder 31, which is beneficial to support the limiting rod 6 and facilitate the vertical sliding of the limiting rod 6. A through groove is formed at the top of the bearing plate 5. The limiting rod 6 is slidably inserted into the inner cavity of the through groove, which is beneficial to limit the relative positions of the bearing plate 5 and the fixed cylinder 7, and further beneficial to limit the position of the inner sleeve 32, facilitating the installation and disassembly of the inner sleeve 32. Fixed cylinders 7 are fixedly connected to both the top and bottom of the inner sleeve 32. The limiting rod 6 is slidably inserted into the inner cavity of the fixed cylinder 7. A locking bolt 8 for locking the relative position of the limiting rod 6 and the fixed cylinder 7 is threadedly inserted into the outer wall of the fixed cylinder 7, which is beneficial to limit the relative position of the limiting rod 6 and the fixed cylinder 7 and prevent the random sliding of the limiting rod 6.

[0032] Specifically, assembly plates are fixedly connected to both the top and bottom of the outer protective shell 1. The assembly plates and the positioning bolts are beneficial to connect and fix the two outer protective shells 1, facilitating the installation and fixation of the two outer protective shells 1. A positioning bolt is threadedly inserted between adjacent assembly plates. An assembly plate is fixedly connected to the side of one of the outer protective shells 1, which is beneficial to increase the docking stability of the two protective shells 1. An assembly groove matching with the assembly plate is formed in the side of the other outer protective shell 1. A support plate is fixedly connected to the inner wall of the outer protective shell 1, which is beneficial to hold the installation cylinder 1. The inner wall of the support plate is attached to the outer wall of the installation cylinder 31. Positioning plates 12 are symmetrically and fixedly connected to the outer wall of the outer protective shell 1. Support legs 4 are fixedly connected to the bottom of the positioning plates 12, which is beneficial to support the outer protective shell 1 and facilitate the support and use of the air preheater.

[0033] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. An anti-corrosion air preheater, comprising an outer casing (1) and a connecting cylinder (2), characterized in that, The connecting cylinder (2) is fixedly connected to the side of the outer protective shell (1), and an auxiliary mechanism (3) for increasing the temperature of the externally entering air is arranged inside the outer protective shell (1). The auxiliary mechanism (3) includes: An installation cylinder (31) located inside the outer protective shell (1). A plurality of enamel-coated heat exchange tubes are installed inside the installation cylinder (31), and the enamel-coated heat exchange tubes are used for heat exchange with the tail gas. An inner sleeve (32) located inside the installation cylinder (31), and the inner sleeve (32) is used for allowing external air to enter. A water inlet pipe (34) and a water outlet pipe (35). The end of the water inlet pipe (34) is fixedly sleeved with a bent pipe, and the end of the bent pipe is sleeved with the end of the water outlet pipe (35). The water inlet pipe (34) is used for allowing high-temperature water from the deaerator to pass through for heat exchange with the external air.

2. An anti-corrosion air preheater according to claim 1, characterized in that, Two circular grooves are formed at the top end of the inner sleeve (32). The outer walls of the water inlet pipe (34) and the water outlet pipe (35) are respectively fixedly inserted and connected to the inner cavities of the two circular grooves. A cold air pipe (33) is fixedly inserted and connected to the side of the inner sleeve (32), and an air outlet pipe is fixedly inserted and connected to the other side of the inner sleeve (32).

3. The anti-corrosion air preheater according to claim 1, characterized in that, Support columns (11) are fixedly connected to the inner wall of the installation cylinder (31), and arc-shaped plates (10) are fixedly connected to the ends of the support columns (11). A guide plate (9) is fixedly connected to the outer wall of the inner sleeve (32).

4. The anti-corrosion air preheater according to claim 3, characterized in that, A guide groove is formed in the inner wall of the arc-shaped plate (10), and the guide plate (9) is slidably inserted and connected to the inner cavity of the guide groove. The guide plate (9) and the arc-shaped plate (10) are used for slidingly guiding the installation of the inner sleeve (32).

5. The anti-corrosion air preheater according to claim 1, characterized in that Carrying plates (5) are symmetrically and fixedly connected to the side of the installation cylinder (31). A through groove is formed at the top end of the carrying plate (5), and a limiting rod (6) is slidably inserted and connected to the inner cavity of the through groove.

6. An anti-corrosion air preheater according to claim 5, characterized in that, Fixed cylinders (7) are fixedly connected to both the top end and the bottom end of the inner sleeve (32). The limiting rod (6) is slidably inserted and connected to the inner cavity of the fixed cylinder (7). A locking bolt (8) for locking the relative positions of the limiting rod (6) and the fixed cylinder (7) is threadedly inserted through the outer wall of the fixed cylinder (7).

7. An anti-corrosion air preheater according to claim 1, characterized in that, Assembly plates are fixedly connected to both the top end and the bottom end of the outer protective shell (1). Positioning bolts are threadedly inserted between adjacent assembly plates. An assembly plate is fixedly connected to the side of one of the outer protective shells (1), and an assembly groove matching the assembly plate is formed in the side of the other outer protective shell (1). A support plate is fixedly connected to the inner wall of the outer protective shell (1), and the inner wall of the support plate is attached to the outer wall of the installation cylinder (31).

8. An anti-corrosion air preheater according to claim 1, characterized in that, Positioning plates (12) are symmetrically and fixedly connected to the outer wall of the outer protective shell (1), and support legs (4) are fixedly connected to the bottom ends of the positioning plates (12).

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