Anti-corrosion device for air pre-heater

Abstract

The utility model relates to the technical field of air pre-heaters, in particular to an anti-corrosion device of an air pre-heater. According to the technical scheme, the device comprises a condensation box, an air pre-heater and a sleeve, the condensation box is welded to the outer end face of one side of the air pre-heater, a condensation pipe is fixedly embedded in the condensation box, a refrigerator is installed in the condensation pipe, the outer end face of one side of the condensation pipe communicates with an air inlet pipe, and an adsorption plate is fixedly embedded in the air inlet pipe; a sleeve is fixedly embedded into the air pre-heater, a heat exchange pipe is fixedly embedded into the sleeve, the outer end face of one side of the heat exchange pipe communicates with a supporting pipe, the upper surface of the sleeve communicates with a fixing pipe penetrating through the air pre-heater, and the outer surface of the fixing pipe is in threaded connection with a fixing valve. The upper surface of the sleeve communicates with a connecting pipe penetrating through the air pre-heater, and the outer surface of the connecting pipe is in threaded connection with a connecting valve. The device can reduce the pickling corrosion of the air pre-heater, improve the boiler efficiency, prolong the service life of the air pre-heater and reduce the maintenance cost of the air pre-heater.

Description

Technical Field

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

[0002] Air preheater is a heating surface that preheats the flue gas in the tail flue of the boiler to a certain temperature through the internal heat sink. It is a device used to improve the heat exchange performance of the boiler and reduce energy consumption. Air preheaters are generally divided into three types: plate type, rotary type and tube type. The working principle of air preheater is introduced by taking the rotary type as an example.

[0003] The prior art discloses a combined air preheater anti-corrosion joint of CN214198749U, which includes: a connecting pipe plugged into one end of the air preheater away from the boiler, a diversion branch pipe plugged into the bottom of the connecting pipe, a diversion assembly fixedly connected to the diversion branch pipe, and a butt flange sleeved on the other end of the connecting pipe; the diversion assembly includes: a diversion plate arranged inside the connecting pipe, and a diversion groove arranged in the connecting pipe; one side of the diversion plate is connected to the alkaline water micro-spray pipe; the air preheater is a horizontal structure; the diversion groove is arranged at the bottom of the connecting pipe; the diversion plate is arranged at the top of the connecting pipe. The utility model neutralizes and diverts the sulfuric acid mist condensed at low temperature through the diversion assembly, avoids the sulfuric acid liquid from overflowing and corroding the metal parts, and assists the sealing effect.

[0004] Low-temperature corrosion is a common corrosion mode of air preheater. This is because the flue gas produced by combustion contains a certain amount of water vapor and sulfuric acid vapor. When the flue gas enters the tail flue and the air preheater for heat exchange, due to the drop in flue gas temperature or the flue gas contacts the air preheater tube wall with a lower temperature, when the tube wall temperature is less than or equal to the flue gas acid dew point, the sulfuric acid vapor in the flue gas will undergo a phase change on the tube wall when it contacts it, condense into liquid and cause acid corrosion. After the air preheater is corroded by acid, the heat exchange efficiency of the air and flue gas entering the air preheater decreases, the air cannot fully exchange heat with the flue gas, and the temperature of the air entering the boiler decreases, affecting the stability and efficiency of the mixed combustion of air and gas, resulting in an increase in heat loss from incomplete combustion of the gas. Utility Model Content

[0005] The utility model aims to provide an air preheater anti-corrosion device to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an air preheater anti-corrosion device, comprising a condenser box, an air preheater and a sleeve, a condenser box is welded to an outer end surface of one side of the air preheater, and a condenser tube is embedded and fixed inside the condenser box, a refrigerator is installed inside the condenser tube, a connecting rod is welded to the lower surface of the condenser box, and a bottom plate is welded to the lower surface of the connecting rod, the bottom plate is welded to an outer end surface of one side of the workbench, a sleeve is embedded and fixed inside the air preheater, and a heat exchange tube is embedded and fixed inside the sleeve, and one outer end surface of the heat exchange tube is connected to a support tube.

[0007] When using an air preheater anti-corrosion device in the technical solution, the gas is sent into the air inlet pipe, and the gas is adsorbed by the adsorption plate to remove the acidic substances in the gas. Then the gas enters the condenser tube. The refrigerator can cool the gas under the action of the power device. The condensed water can enter the liquid outlet pipe. The liquid outlet valve is opened and the condensed water can flow out. After the gas is dehumidified, the gas enters the air preheater through the outlet pipe. The gas can be deacidified and dehumidified before entering the air preheater, which can reduce the pickling corrosion of the air preheater, improve the boiler efficiency, extend the service life of the air preheater, and reduce its maintenance cost.

[0008] Preferably, an air inlet pipe is connected to one side of the condenser tube, and an adsorption plate is embedded and fixed inside the air inlet pipe, and the adsorption plate is filled with alkaline substances. By arranging the air inlet pipe and the adsorption plate on one side of the condenser tube, it is convenient to adsorb acidic gas.

[0009] Preferably, a workbench is welded on the lower surface of the air preheater, and supporting legs are welded on the lower surface of the workbench. By arranging the workbench and supporting legs on the lower surface of the air preheater, it is convenient to support the air preheater.

[0010] Preferably, the lower surface of the condenser is connected with a liquid outlet pipe, and the outer surface of the liquid outlet pipe is threadedly connected with a liquid outlet valve. By arranging the liquid outlet pipe on the lower surface of the condenser, liquid outlet is convenient.

[0011] Preferably, an air outlet pipe is connected to an outer end surface of one side of the condenser tube, and the air outlet pipe is connected to the heat exchange tube. By arranging the air outlet pipe on one side of the condenser tube, it is convenient to send the gas into the heat exchange tube.

[0012] Preferably, the upper surface of the sleeve is connected with a fixed pipe penetrating the air preheater, and the outer surface of the fixed pipe is threadedly connected with a fixed valve. By arranging the fixed pipe on the upper surface of the sleeve, feeding is facilitated.

[0013] Preferably, the upper surface of the sleeve is connected with a connecting pipe that penetrates the air preheater, and the outer surface of the connecting pipe is threadedly connected with a connecting valve. By arranging the connecting pipe on the upper surface of the sleeve, feeding is convenient.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] 1. The utility model achieves the effect of reducing the pickling corrosion of the air preheater, improving the boiler efficiency, extending the service life of the air preheater, and reducing its maintenance cost by arranging a condensing box, an air inlet pipe and an adsorption plate. The gas is sent into the air inlet pipe, and the gas is adsorbed by the adsorption plate to remove the acidic substances in the gas. Then the gas enters the condenser pipe. The refrigerator can cool the gas under the action of the power device. The condensed water can enter the liquid outlet pipe. The liquid outlet valve is opened and the condensed water can flow out. After the gas is dehumidified, the gas enters the air preheater through the air outlet pipe. The gas can be deacidified and dehumidified before entering the air preheater, which can reduce the pickling corrosion of the air preheater, improve the boiler efficiency, extend the service life of the air preheater, and reduce its maintenance cost.

[0016] 2. The utility model achieves the effect of facilitating heat exchange by arranging the casing, the heat exchange tube and the fixed tube. The gas enters the heat exchange tube through the outlet pipe, and the gas flows inside the heat exchange tube. The fixed valve is opened, and the heat source is sent into the casing through the fixed tube. The heat source flows inside the casing, which is convenient for heat exchange. After the heat exchange, the gas is discharged through the supporting tube, and the heat source is discharged through the connecting tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0018] Figure 2 It is an enlarged structural schematic diagram of the condensation box of the utility model;

[0019] Figure 3 This is a schematic diagram of the main cross-sectional structure of the condensation box of the utility model;

[0020] Figure 4 It is a schematic diagram of the main cross-sectional structure of the air preheater of the utility model.

[0021] In the figure: 1. condenser box; 2. air preheater; 3. air inlet pipe; 4. connecting rod; 5. bottom plate; 6. workbench; 7. supporting leg; 8. liquid outlet valve; 9. liquid outlet pipe; 10. adsorption plate; 11. refrigerator; 12. condenser pipe; 13. air outlet pipe; 14. fixed pipe; 15. fixed valve; 16. connecting valve; 17. connecting pipe; 18. supporting pipe; 19. heat exchange pipe; 20. casing. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] Embodiment 1

[0024] See also Figures 1 to 4 The utility model provides an embodiment: an air preheater anti-corrosion device, comprising a condenser box 1, an air preheater 2 and a sleeve 20, a workbench 6 is welded to the lower surface of the air preheater 2, and a supporting leg 7 is welded to the lower surface of the workbench 6, a condenser box 1 is welded to the outer end surface of one side of the air preheater 2, and a condenser tube 12 is embedded and fixed inside the condenser box 1, a connecting rod 4 is welded to the lower surface of the condenser box 1, and a bottom plate 5 is welded to the lower surface of the connecting rod 4, and the bottom plate 5 is welded to the outer end surface of one side of the workbench 6, a refrigerator 11 is installed inside the condenser tube 12, an outer end surface of one side of the condenser tube 12 is connected with an air inlet pipe 3, and an adsorption plate 10 is embedded and fixed inside the air inlet pipe 3, the interior of the adsorption plate 10 is filled with alkaline substances, the lower surface of the condenser tube 12 is connected with a liquid outlet pipe 9, and the outer surface of the liquid outlet pipe 9 is threadedly connected with a liquid outlet valve 8.

[0025] Of course, as is well known to those skilled in the art, the air preheater 2, refrigerator 11, condenser 12 and heat exchange tube 19 of the utility model also need to be provided with a power device to enable them to work normally, and as is well known to those skilled in the art, the provision of the power is commonplace, and they all belong to conventional means or common knowledge, and will not be elaborated here. Those skilled in the art can make any optional selections according to their needs or convenience.

[0026] An air preheater anti-corrosion device based on Example 1, gas is sent into the interior of the air inlet pipe 3, the gas is adsorbed by the adsorption plate 10, the acidic substances in the gas can be removed, and then the gas enters the interior of the condenser 12, the refrigerator 11 can cool the gas under the action of the power device, the condensed water can enter the liquid outlet pipe 9, open the liquid outlet valve 8, the condensed water can flow out, after the gas is dehumidified, the gas enters the interior of the air preheater 2 through the outlet pipe 13, the gas can be deacidified and dehumidified before entering the air preheater 2, which can reduce the pickling corrosion of the air preheater 2, improve the boiler efficiency, extend the service life of the air preheater 2, and reduce its maintenance cost.

[0027] Embodiment 2

[0028] like Figure 1-Figure 4As shown, the utility model proposes an air preheater anti-corrosion device. Compared with the first embodiment, this embodiment also includes a condenser box 1, an air preheater 2 and a sleeve 20. The outer end surface of one side of the condenser tube 12 is connected with an air outlet pipe 13, and the air outlet pipe 13 is connected with a heat exchange tube 19. The sleeve 20 is embedded and fixed inside the air preheater 2, and the heat exchange tube 19 is embedded and fixed inside the sleeve 20. The outer end surface of one side of the heat exchange tube 19 is connected with a support tube 18. The upper surface of the sleeve 20 is connected with a fixed tube 14 passing through the air preheater 2, and the outer surface of the fixed tube 14 is threadedly connected with a fixed valve 15. The upper surface of the sleeve 20 is connected with a connecting tube 17 passing through the air preheater 2, and the outer surface of the connecting tube 17 is threadedly connected with a connecting valve 16.

[0029] In this embodiment, the gas enters the heat exchange tube 19 through the outlet pipe 13, and the gas flows inside the heat exchange tube 19. The fixed valve 15 is opened, and the heat source is sent into the sleeve 20 through the fixed pipe 14. The heat source flows inside the sleeve 20 to facilitate heat exchange. After the heat exchange, the gas is discharged through the support pipe 18, and the heat source is discharged through the connecting pipe 17.

[0030] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. An air preheater anti-corrosion device, comprising a condenser box (1), an air preheater (2), a workbench (6) and a sleeve (20), characterized in that: A condenser box (1) is welded to the outer end surface of one side of the air preheater (2), and a condenser tube (12) is embedded and fixed inside the condenser box (1), a refrigerator (11) is installed inside the condenser tube (12), a connecting rod (4) is welded to the lower surface of the condenser box (1), and a bottom plate (5) is welded to the lower surface of the connecting rod (4), the bottom plate (5) is welded to the outer end surface of one side of the workbench (6), a sleeve (20) is embedded and fixed inside the air preheater (2), and a heat exchange tube (19) is embedded and fixed inside the sleeve (20), and one outer end surface of the heat exchange tube (19) is connected to a support tube (18).

2. The air preheater anti-corrosion device according to claim 1, characterized in that: One side outer end surface of the condenser tube (12) is connected to an air inlet pipe (3), and an adsorption plate (10) is embedded and fixed inside the air inlet pipe (3), and the interior of the adsorption plate (10) is filled with alkaline substances.

3. The air preheater anti-corrosion device according to claim 1, characterized in that: A workbench (6) is welded to the lower surface of the air preheater (2), and a supporting leg (7) is welded to the lower surface of the workbench (6).

4. The air preheater anti-corrosion device according to claim 1, characterized in that: The lower surface of the condenser tube (12) is connected to a liquid outlet pipe (9), and the outer surface of the liquid outlet pipe (9) is threadedly connected to a liquid outlet valve (8).

5. The air preheater anti-corrosion device according to claim 1, characterized in that: One outer end surface of the condenser tube (12) is connected to an air outlet pipe (13), and the air outlet pipe (13) is connected to a heat exchange tube (19).

6. The air preheater anti-corrosion device according to claim 1, characterized in that: The upper surface of the sleeve (20) is in communication with a fixed pipe (14) that passes through the air preheater (2), and a fixed valve (15) is threadedly connected to the outer surface of the fixed pipe (14).

7. The air preheater anti-corrosion device according to claim 1, characterized in that: The upper surface of the sleeve (20) is connected to a connecting pipe (17) that passes through the air preheater (2), and the outer surface of the connecting pipe (17) is threadedly connected to a connecting valve (16).

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