Anti-corrosion tubular air pre-heater

Abstract

The utility model discloses an anti-corrosion tubular air pre-heater, and relates to the technical field of heating of air for combustion. The anti-corrosion tubular air preheater comprises a preheating pipeline, the surface of the preheating pipeline is fixedly connected with a stepped pipeline, and the surface of the stepped pipeline is fixedly connected with a smoke inlet pipe; the surface of the preheating pipeline is fixedly connected with four air flow dividing pipes, the surfaces of the four air flow dividing pipes are fixedly connected with an air inflow pipe, and four air flow dividing holes are formed in the air inflow pipe. By arranging the last section of stepped pipeline with the small size, the temperature difference, conveyed to a certain section of the interior of the smoke outlet pipe, of the stepped pipeline can be reduced, and therefore the temperature uniformity of the four side walls of the smoke outlet pipe can be better improved; as the cross sections of the four air shunting holes are the same, the temperature change uniformity of the four side walls of the smoke outlet pipe can be improved.

Description

Technical Field

[0001] This utility model relates to the field of heating technology for supplying combustion air, and in particular to a corrosion-resistant tubular air preheater. Background Technology

[0002] A tubular air preheater refers to an air preheater in which flue gas and air flow inside and outside the pipe respectively, and heat exchange occurs through the pipe wall. A Chinese utility model patent, authorized announcement number "CN217519897U", discloses a heat pipe air preheater, which includes an air inlet and a preheater. The preheater is fixedly installed at one end of the air inlet, and several sets of flow pipes are evenly installed inside the preheater.

[0003] The above technical solution employs baffles, baffle rings, heat-conducting rods, and tin foil layers. During flue gas flow, the gaps formed between the baffles weaken the flow velocity of the flue gas, ensuring that the flue gas remains in the device for a longer period of time, thus achieving better preheating of the air. When the flue gas flows through the baffles, it flows into the heat-conducting rod through the surface holes, increasing the contact area with the air and improving the preheating effect. However, the air can only contact the left and right ends of the preheater, resulting in the overall temperature of the preheater being lower at the left and right ends than at the top and bottom ends. Since preheaters are generally made of iron, this uneven temperature over time leads to inconsistent thermal expansion and contraction of the pipes, which can easily cause uneven deformation of the preheater. Utility Model Content

[0004] The purpose of this invention is to at least solve one of the technical problems existing in the prior art, and to provide a corrosion-resistant tubular air preheater that can solve the problem of excessively uneven surface temperature of the preheater.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a corrosion-resistant tubular air preheater, comprising a preheating pipe, wherein a stepped pipe is fixedly connected to the surface of the preheating pipe, and a smoke inlet pipe is fixedly connected to the surface of the stepped pipe.

[0006] The preheating pipe has four air distribution pipes fixedly connected to its surface, and air inlet pipes fixedly connected to the surface of the four air distribution pipes. The air inlet pipes have four air distribution holes inside, which are symmetrical along the central axis of the air inlet pipes. The positions of the four air distribution holes coincide with the corresponding air distribution pipes.

[0007] Preferably, the preheating pipe has four air preheating holes inside, and each of the four air preheating holes corresponds to one of the four air distribution pipes.

[0008] Preferably, each of the four air preheating holes is fixedly connected to a plurality of vertical pipes;

[0009] Each of the four air preheating holes has multiple horizontal pipes fixedly connected inside.

[0010] Preferably, the preheating pipe has a smoke outlet pipe inside;

[0011] The smoke outlet pipe includes a square pipe body, the inside of which is fixedly coated with an anti-corrosion layer.

[0012] Preferably, the smoke outlet pipe is internally fixedly connected with multiple cross-shaped tubes;

[0013] Among them, multiple cross tubes each include a cross tube body, and the surface of multiple cross tube bodies is coated with the same anti-corrosion layer.

[0014] Preferably, the material of all of the multiple anti-corrosion layers is RLHY-high temperature resistant flue gas anti-corrosion paint.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] (1) The corrosion-resistant tubular air preheater concentrates the hot smoke from the smoke inlet pipe by setting up a smaller stepped pipe, and then the smoke enters the interior of the smoke outlet pipe. Compared with the smoke directly entering the interior of the smoke outlet pipe, the smaller stepped pipe at the last section can reduce the temperature difference at a certain cross section of the stepped pipe, thereby improving the temperature uniformity of the four side walls of the smoke outlet pipe. The air enters the interior of the four air distribution holes through the air inlet pipe. Since the cross section of the four air distribution holes is the same, the amount of air entering for preheating is consistent, making the heat dissipation of the outer wall of the smoke outlet pipe more uniform. In summary, it can improve the uniformity of the temperature change of the four side walls of the smoke outlet pipe and reduce the possibility of instability and unevenness of the preheater.

[0017] (2) The anti-corrosion tubular air preheater has multiple anti-corrosion layers made of RLHY-9035 high-temperature resistant flue gas anti-corrosion paint. RLHY-9035 high-temperature resistant flue gas anti-corrosion paint has extremely high mechanical strength and hardness, excellent toughness and shock resistance, good integrity, good environmental compatibility, good anti-corrosion performance, and no environmental pollution. Multiple anti-corrosion layers are in contact with its flue gas, and multiple anti-corrosion layers have good corrosion resistance, which can improve the corrosion resistance of the preheater.

[0018] (3) In this corrosion-resistant tubular air preheater, the smoke flows out of the preheating pipe through the smoke inlet pipe and finally through the smoke outlet pipe. By setting the air inlet pipe to restrict the flow of smoke, the smoke is partially retained inside the air inlet pipe for preliminary heating of the air inside the four air distribution pipes, thereby improving the utilization rate of smoke heat. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a schematic diagram showing the connection relationship between the air distribution pipe and the preheating pipe of this utility model;

[0022] Figure 3 This is a schematic diagram of the internal structure of the preheating pipe of this utility model;

[0023] Figure 4 This utility model Figure 3 Enlarged view of point A in the middle;

[0024] Figure 5 This is a schematic diagram of the cross-shaped tube of this utility model.

[0025] Reference numerals: 1. Air diversion hole; 2. Air inlet pipe; 3. Air diversion pipe; 4. Preheating pipe; 5. Stepped pipe; 6. Smoke inlet pipe; 7. Vertical pipe; 8. Cross pipe; 9. Horizontal pipe; 10. Air preheating hole; 11. Smoke outlet pipe; 111. Anti-corrosion layer; 112. Square pipe body; 81. Cross pipe body. Detailed Implementation

[0026] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0027] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] In the description of this utility model, terms such as greater than, less than, and exceeding are understood to exclude the stated number, while terms such as above, below, and within are understood to include the stated number. The use of terms like "first" and "second" is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the quantity or sequence of the indicated technical features.

[0029] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0030] Please see Figure 1-5 This utility model provides a technical solution: a corrosion-resistant tubular air preheater, including a preheating pipe 4, the preheating pipe 4 being used in a tubular air preheater, a stepped pipe 5 being fixedly connected to the surface of the preheating pipe 4, and a smoke inlet pipe 6 being fixedly connected to the surface of the stepped pipe 5.

[0031] Among them, four air diversion pipes 3 are fixedly connected to the surface of the preheating pipe 4, and air inlet pipes 2 are fixedly connected to the surface of the four air diversion pipes 3. Four air diversion holes 1 are opened inside the air inlet pipe 2. The four air diversion holes 1 are axially symmetrical along the central axis of the air inlet pipe 2, and the positions of the four air diversion holes 1 coincide with the corresponding air diversion pipes 3.

[0032] The preheating pipe 4 has four air preheating holes 10 inside, and each of the four air preheating holes 10 corresponds to one of the four air distribution pipes 3.

[0033] Each of the four air preheating holes 10 has multiple vertical pipes 7 fixedly connected inside;

[0034] Among them, multiple horizontal pipes 9 are fixedly connected inside the four air preheating holes 10.

[0035] The preheating pipe 4 has a smoke outlet pipe 11 inside;

[0036] The smoke outlet pipe 11 includes a square pipe body 112, and the inside of the square pipe body 112 is fixedly coated with an anti-corrosion layer 111.

[0037] Multiple cross tubes 8 are fixedly connected inside the smoke outlet pipe 11;

[0038] Among them, each of the multiple cross tubes 8 includes a cross tube body 81, and the surface of the multiple cross tube bodies 81 is coated with the same anti-corrosion layer 111.

[0039] The material of multiple anti-corrosion layers 111 is RLHY-9035 high-temperature resistant flue gas anti-corrosion paint. RLHY-9035 high-temperature resistant flue gas anti-corrosion paint has extremely high mechanical strength and hardness, excellent toughness and shock resistance, good integrity, good environmental compatibility, good anti-corrosion performance, and no environmental pollution.

[0040] When using this tubular air preheater, the center line connecting the smoke inlet pipe 6 and the air diversion hole 1 is perpendicular to the ground to ensure that the smoke enters from the smoke inlet pipe 6 and exits from the inside of the smoke outlet pipe 11. The air enters the inside of the four air diversion holes 1. The four air diversion holes 1 are the same size and have the same air flow. Then the air from the four air diversion holes 1 enters the inside of the corresponding air preheating hole 10 through the corresponding air diversion pipe 3 for preheating.

[0041] By using a smaller stepped pipe 5 to concentrate the hot smoke from the smoke inlet pipe 6, the smoke then enters the smoke outlet pipe 11. Compared to the smoke directly entering the smoke outlet pipe 11, when the last section of the stepped pipe 5 is infinitely small, the temperature of a certain cross-section of the stepped pipe 5 is completely uniform. Without considering external factors, the heat dissipated to each inner wall of the smoke outlet pipe 11 should be uniform. Therefore, the smaller size of the last section of the stepped pipe 5 can reduce the heat loss at a certain cross-section of the smoke outlet pipe 11. The temperature difference further enhances the uniformity of the temperature on the four side walls of the smoke outlet pipe 11, making the heat received on each surface more even. Air enters the interior of the four air diversion holes 1 through the air inlet pipe 2. Since the cross-sections of the four air diversion holes 1 are the same, the amount of air entering them is consistent. The same amount of cold air inside the four air diversion holes 1 eventually enters the interior of the air preheating hole 10 for preheating, making the heat dissipation of the outer wall of the smoke outlet pipe 11 more even. In summary, this can improve the uniformity of the temperature change of the four side walls of the smoke outlet pipe 11 and reduce the possibility of instability and unevenness in the preheater.

[0042] The material of the multiple anti-corrosion layers 111 is RLHY-9035 high-temperature resistant flue gas anti-corrosion paint. RLHY-9035 high-temperature resistant flue gas anti-corrosion paint has extremely high mechanical strength and hardness, excellent toughness and shock resistance, good integrity, good environmental compatibility, good anti-corrosion performance, and no environmental pollution. The multiple anti-corrosion layers 111 are in contact with the flue gas, and the multiple anti-corrosion layers 111 have good corrosion resistance, which can improve the corrosion resistance of the preheater.

[0043] The smoke flows out of the preheating pipe 4 through the smoke inlet pipe 6 and finally through the smoke outlet pipe 11. By setting the air inlet pipe 2 to restrict the flow of smoke, part of the smoke is left inside the air inlet pipe 2 to preheat the air inside the four air distribution pipes 3, thereby improving the utilization rate of smoke heat.

[0044] Working principle: When using this tubular air preheater, the center line connecting the smoke inlet pipe 6 and the air diversion hole 1 is perpendicular to the ground, ensuring that the smoke enters from the smoke inlet pipe 6 and exits from the inside of the smoke outlet pipe 11, and the air enters the inside of the four air diversion holes 1. Then, the air from the four air diversion holes 1 enters the inside of the corresponding air preheating hole 10 through the corresponding air diversion pipe 3 for preheating.

[0045] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A corrosion-resistant tubular air preheater, comprising a preheating pipe (4), characterized in that: The surface of the preheating pipe (4) is fixedly connected to a stepped pipe (5), and the surface of the stepped pipe (5) is fixedly connected to a smoke inlet pipe (6); Among them, four air diversion pipes (3) are fixedly connected to the surface of the preheating pipe (4), and air inlet pipes (2) are fixedly connected to the surface of the four air diversion pipes (3). Four air diversion holes (1) are opened inside the air inlet pipe (2). The four air diversion holes (1) are centrally symmetrical along the central axis of the air inlet pipe (2), and the positions of the four air diversion holes (1) coincide with the corresponding air diversion pipes (3).

2. The corrosion-resistant tubular air preheater according to claim 1, characterized in that: The preheating pipe (4) has four air preheating holes (10) inside, and each of the four air preheating holes (10) corresponds to one of the four air diversion pipes (3).

3. The corrosion-resistant tubular air preheater according to claim 2, characterized in that: Each of the four air preheating holes (10) is fixedly connected to a number of vertical pipes (7); Among them, multiple horizontal pipes (9) are fixedly connected inside the four air preheating holes (10).

4. A corrosion-resistant tubular air preheater according to claim 1, characterized in that: The preheating pipe (4) is provided with a smoke outlet pipe (11) inside; The smoke outlet pipe (11) includes a square pipe body (112), and the inside of the square pipe body (112) is fixedly coated with an anti-corrosion layer (111).

5. A corrosion-resistant tubular air preheater according to claim 4, characterized in that: The smoke outlet pipe (11) is internally fixedly connected to multiple cross tubes (8); Among them, multiple cross tubes (8) each include a cross tube body (81), and the surface of multiple cross tube bodies (81) is coated with the same anti-corrosion layer (111).

6. A corrosion-resistant tubular air preheater according to claim 4, characterized in that: The material of all of the aforementioned anti-corrosion layers (111) is RLHY-9035 high-temperature resistant flue gas anti-corrosion paint.

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