CN201028567Y - Heat Pipe Air Preheater - Google Patents

Abstract

The utility model relates to a heat pipe type air preheater. The support is provided with a box, one side of the box is provided with an air outlet and a flue gas inlet, and the other side is provided with a flue gas outlet and an air inlet, and a soot blower is arranged on the box, and the box is installed vertically There is a heat pipe; the heat pipe is an independent heat transfer unit, and the inorganic solution is used as the heat transfer intermediate medium, and the phase change heat transfer can be performed in the heat pipe, which improves the heat transfer efficiency of the equipment and the system operation efficiency; the intermediate medium combines cold air and hot flue gas The two media are separated, which effectively increases the temperature of the metal wall on the high-temperature flue gas side, effectively avoids the dew point corrosion of the metal caused by the acid gas on the flue gas side, and prolongs the service life of the equipment; the heat pipes are arranged in a triangular staggered arrangement to expand the windward side of the preheater The area reduces the flow resistance of the two fluids; effectively reduces the exhaust gas temperature of the system; helps to eliminate the dust on the surface of the heat pipe and facilitates the collection and removal of the blown dust in the heat exchanger; it can be widely used in heat medium furnaces , Direct furnace and boiler system.

Description

Heat Pipe Air Preheater

technical field

The utility model belongs to the field of air preheaters and relates to a heat pipe type air preheater.

Background technique

At present, most heat medium furnaces, direct furnaces and boiler systems use tube-and-tube air preheaters. The two media in the tube-and-tube air preheaters flow laterally inside and outside the heat exchange tubes, and are directly heated through the partition walls of the heat exchange tubes. Heat transfer is a heat transfer process without phase change; however, since the hot and cold medium flows and transfers heat on both sides of the heat exchange tube, the surface wall temperature of the heat exchange tube is low and the heat transfer efficiency is low; at the same time, due to the flue gas The acid gas produced in the air is easy to cause dew point corrosion to the heat exchange tube, and a large amount of dust in the flue gas accumulates on the surface of the heat exchange tube, which is not easy to fall off, and hardens on the surface of the heat exchange tube for a long time, which seriously affects the heat transfer of the heat exchanger In addition, the gas flow in the shell and tube air preheater is multi-flow, and the flow resistance of hot and cold gas is large, which increases the power consumption of the equipment during operation.

Contents of the invention

The purpose of the utility model is to provide a heat pipe type air preheater which is beneficial to improve the heat transfer efficiency of the equipment, reduce the dust on the surface of the heat pipe, and prolong the service life of the equipment.

The technical solution adopted by the utility model: a heat pipe type air preheater, a box body is arranged on the support, an air outlet and a flue gas inlet are arranged on one side of the box body, and a flue gas outlet and an air inlet are arranged on the other side , a soot blower is arranged on the box body, and a heat pipe is vertically installed in the box body.

The heat pipes are arranged in a triangular staggered arrangement in the box body, and are connected with the box body through an upper tube sheet, a middle tube sheet, and a lower tube sheet.

Inorganic solution is added to the tube body of the heat pipe, a sealing block is arranged at the installation place between the tube body and the upper tube sheet, the middle tube sheet, and the lower tube sheet, the upper outer wall of the tube body is wound with circular air-side fins, and the lower outer wall is wound with There are circumferential smoke side fins.

The lower part of the box body is provided with a dust cleaning bucket.

The utility model successfully applies the heat pipe technology to the air preheater, and has the following positive and beneficial effects:

1. The vertical heat pipe is used as an independent heat transfer unit, and the inorganic solution is used as the heat transfer intermediate medium to transfer heat through phase change in the heat pipe, which improves the heat transfer efficiency of the equipment and the operating efficiency of the system;

2. The intermediate medium separates the cold air and the hot flue gas, which effectively increases the metal wall temperature on the high-temperature flue gas side. The calculated value of the heat pipe wall temperature on the flue gas side is about 135°C, avoiding the dew point corrosion temperature of the flue gas , effectively avoiding the dew point corrosion of the metal caused by the acid gas on the flue gas side, and prolonging the service life of the equipment;

3. Effectively reduce the exhaust gas temperature of the system. The heat pipe air preheater is applied to the 4650KW heat medium furnace system. The exhaust gas temperature of the system is reduced from 220°C to 140°C, and the effect is obvious;

4. The heat pipes of the heat transfer unit adopt triangular staggered distribution, which enlarges the area of the windward side of the preheater and reduces the flow resistance of the two fluids;

5. Increase the fin spacing on the flue gas side of the heat pipe, reduce the ash on the surface of the heat pipe, eliminate the dead angle of soot blowing on the side of the flue gas, and help eliminate the ash on the surface of the heat pipe;

6. The lower part of the air preheater is equipped with a dust cleaning bucket, which is more convenient to collect and remove the blown dust in the heat exchanger;

7. The pressure drop along the air side and the flue gas side is also significantly reduced, which are 610Pa and 270Pa respectively;

8. It is beneficial to environmental protection and energy saving. It is a new type of flue gas/air heat exchange equipment and can be widely used in heat medium furnaces, direct furnaces and boiler systems.

Description of drawings

Fig. 1 is the front view of the structural representation of the utility model;

Fig. 2 is the right side view of the structural representation of the utility model;

Fig. 3 is the top view of the structural representation of the utility model;

Fig. 4 is an enlarged view of part I in Fig. 3;

Fig. 5 is the structural schematic diagram of heat pipe of the present utility model;

Fig. 6 is a working principle diagram of the utility model.

Detailed ways

Referring to Figure 1, Figure 2, and Figure 3, a heat pipe air preheater mainly includes an air outlet 1, a flue gas inlet 2, a box body 3, a support 4, a heat pipe 5, a dust cleaning bucket 6, and a flue gas Outlet 7, air inlet 8, upper tube plate 9, middle tube plate 10, soot blower 11, lower tube plate 12, etc.; the support 4 is provided with a box 3, and one side of the box 3 is provided with an air outlet 1, The flue gas inlet 2, the other side is provided with a flue gas outlet 7, an air inlet 8, a soot blower 11 is arranged at the front of the box body 3, a dust cleaning bucket 6 is arranged at the lower part of the box body 3; an upper pipe is arranged inside the box body 3 The plate 9, the middle tube plate 10, the lower tube plate 12, and the heat pipes 5 of a large number of independent heat transfer units are vertically installed.

Referring to Fig. 4, Fig. 5, and Fig. 6, the heat pipes 5 are arranged in a triangular staggered arrangement in the box body 3, and the included angle a is 60°, and the heat pipes 5 are heated by the heat transfer intermediate medium inorganic solution to the box body 3. The heat transfer between the upper cold air and the lower hot flue gas; the heat pipe 5 includes a tube body 501, air side fins 502, sealing blocks 503, flue gas side fins 504, etc.; its tube body 501 Add an inorganic solution, such as water base, toluene, etc. as a heat transfer medium, and the inorganic solution is heated and evaporated at the lower part of the tube body 501, as shown in the direction of the arrow, until the upper part is cooled and condensed, and flows along the wall of the tube body 501 under the action of its own gravity Back to the lower end of the tube body 501, reciprocating cycle; the tube body 501 and the upper tube plate 9, the middle tube plate 10, and the lower tube plate 12 are installed with a sealing block 503, and the outer wall of the upper part of the tube body 501 is wound with a circumferential air side fin 502, To expand the heat transfer area and enhance heat transfer, the lower outer wall is wound with circumferential flue gas side fins 504, and at the same time the distance between each flue gas side fin 504 is increased. By adjusting the upper cold end of the tube body 501 and The length ratio of the lower hot end can effectively control the vapor pressure in the heat pipe 5 .

Claims (4)

1. heat pipe preheater, its bearing is provided with casing, and casing one side is provided with air outlet slit, smoke inlet, and opposite side is provided with exhanst gas outlet, air intake, casing is provided with soot blower, it is characterized in that erectting in the described casing (3) heat pipe (5) is installed.

2. heat pipe preheater according to claim 1 is characterized in that described heat pipe (5) stagger arrangement triangular in shape in casing (3) arranges, and connects with casing (3) by upper perforated plate (9), sagging plate (10), lower perforated plate (12).

3. heat pipe preheater according to claim 1 and 2, the body (501) that it is characterized in that described heat pipe (5) has inorganic solution middle the adding, body (501) is provided with sealing block (503) with upper perforated plate (9), sagging plate (10), lower perforated plate (12) installation place, body (501) external wall of upper portion is wound with hoop air side fins (502), and the bottom outer wall is wound with hoop fume side fin (504).

4. heat pipe preheater according to claim 1 is characterized in that described casing (3) bottom is provided with deashing bucket (6).

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