A high-temperature flue gas circulation system for preventing and treating waste heat corrosion of a boiler economizer

Abstract

The utility model discloses a kind of high-temperature flue gas circulation systems for preventing and treating boiler economizer waste heat corrosion, it is related to the technical field of boiler economizer waste heat corrosion.Boiler economizer main body is included, by the mixed component of setting, so that it is convenient to introduce the inside of boiler economizer main body by the mixed passage of external high-temperature flue gas, so that high-temperature flue gas mixes with the boiler evaporator flue gas of the entrance of boiler economizer main body inside, after mixing in the mixing zone in the inside of boiler economizer main body, thereby improve the temperature of boiler evaporator flue gas, and then reduce the probability that low-temperature flue gas is caused to the surface of heat exchange tube by heat exchange of boiler evaporator flue gas and heat exchange tube, simultaneously, by the turbulence component of setting, so that it is convenient for the flue gas in the inside of mixed passage to enter the inside of boiler economizer main body by uniform flow plate evenly, and then improve the uniformity of high-temperature flue gas and evaporator flue gas mixing, improve mixing efficiency.

Description

Technical Field

[0001] This utility model relates to the field of waste heat corrosion technology of boiler economizers, specifically a high-temperature flue gas circulation system for preventing waste heat corrosion of boiler economizers. Background Technology

[0002] In the boiler operation system, the boiler economizer, as a key waste heat recovery device, needs to exchange heat with the flue gas discharged from the boiler evaporator through heat exchange tubes to achieve efficient energy utilization.

[0003] However, the flue gas temperature in boiler evaporators is usually low. After heat exchange with the heat exchange tubes, the low-temperature flue gas easily forms a corrosive environment on the surface of the heat exchange tubes, leading to corrosion and damage, shortening the service life of the economizer, and affecting the waste heat recovery efficiency. Existing boiler economizer systems lack an effective high-temperature flue gas introduction and mixing mechanism, making it difficult to fully integrate the external high-temperature flue gas with the low-temperature flue gas in the boiler evaporator to increase the overall flue gas temperature. The low-temperature flue gas is in direct contact with the heat exchange tubes, which can still easily cause corrosion. Secondly, even if traditional boiler economizer systems attempt to introduce external flue gas, the lack of a targeted turbulence and flow equalization structure leads to uneven mixing between the external flue gas and the evaporator flue gas, making it difficult to achieve the ideal temperature regulation effect. Therefore, a high-temperature flue gas circulation system that prevents waste heat corrosion in boiler economizers is urgently needed to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a high-temperature flue gas circulation system for preventing waste heat corrosion of boiler economizers, in order to solve the problem mentioned in the background art that the existing boiler economizer system lacks an effective high-temperature flue gas introduction and mixing mechanism, making it difficult to fully integrate external high-temperature flue gas with low-temperature flue gas from the boiler evaporator to increase the overall flue gas temperature.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a high-temperature flue gas circulation system for preventing waste heat corrosion of boiler economizers, comprising a boiler economizer body, wherein a heat exchange tube is fixedly connected inside the boiler economizer body, and further comprising: A mixing component is disposed on the side wall of the boiler economizer body and is used to mix high-temperature flue gas with the boiler evaporator flue gas that has just entered the boiler economizer body through the inlet. A turbulence-disrupting component is disposed between the boiler economizer body and the mixing component to turbulent the high-temperature flue gas inside the mixing component that is about to enter the boiler economizer body.

[0006] Preferably, the mixing component includes a mixing channel, which is fixedly connected to the side wall of the boiler economizer body. The inner wall of the boiler economizer body has a flue gas inlet, and the side wall of the mixing channel is fixedly connected to a connection port.

[0007] Preferably, the turbulence component includes a fixing frame, which is fixedly connected to the inner wall of the smoke inlet. A plurality of flow equalization plates are fixedly connected to the inner wall of the fixing frame, and a snap-fit ​​groove is provided on the periphery of the fixing frame. The inner wall of the snap-fit ​​groove is fixedly connected to the inner wall of the smoke inlet.

[0008] Preferably, multiple temperature sensors are installed inside both the boiler economizer body and the mixing channel. The temperature sensor located inside the mixing channel is fixedly connected to the inner wall of the mixing channel, and the temperature sensor located inside the boiler economizer body is fixedly connected to the inner wall of the boiler economizer body.

[0009] Preferably, a flue gas controller is fixedly connected to the inner wall of the mixing channel, a control motor is fixedly connected to the top surface of the mixing channel, and the control shaft of the flue gas controller is fixedly connected to the output end of the control motor.

[0010] Preferably, a flue gas inlet is fixedly connected to the top surface of the main body of the boiler economizer, a flue gas outlet is fixedly connected to the bottom surface of the main body of the boiler economizer, and an induced draft fan is fixedly connected to the lower end of the flue gas outlet.

[0011] Compared with the prior art, the beneficial effects of this utility model are: The mixing components facilitate the introduction of high-temperature external flue gas into the interior of the boiler economizer body through the mixing channel. This allows the high-temperature flue gas to mix with the boiler evaporator flue gas entering through the inlet of the boiler economizer body. After mixing in the mixing zone inside the boiler economizer body, the temperature of the boiler evaporator flue gas is increased, thereby reducing the probability of corrosion of the heat exchange tube surface by the low-temperature flue gas after heat exchange between the boiler evaporator flue gas and the heat exchange tube. At the same time, the turbulence components facilitate the turbulence of the flue gas entering the boiler economizer body through the mixing channel by multiple flow equalization plates on the inner wall of the fixed frame. This allows the flue gas inside the mixing channel to enter the interior of the boiler economizer body evenly through the flow equalization plates, thereby improving the uniformity of the mixing of high-temperature flue gas and evaporator flue gas and increasing the mixing efficiency. Attached Figure Description

[0012] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a partial cross-sectional view of the turbulence-causing component of this utility model; Figure 3 This is a partial cross-sectional view of the hybrid component of this utility model; Figure 4 for Figure 2 Enlarged structural diagram at point A in the middle.

[0013] In the diagram: 1. Main body of the boiler economizer; 2. Heat exchange tube; 301. Mixing channel; 302. Flue gas inlet; 303. Connection port; 304. Flue gas inlet; 305. Flue gas outlet; 306. Exhaust fan; 307. Flue gas controller; 308. Control motor; 309. Temperature sensor; 401. Fixing frame; 402. Flow equalization plate; 403. Clip groove. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] Please see Figure 1 - Figure 4 This utility model provides a high-temperature flue gas circulation system for preventing waste heat corrosion of boiler economizers, including a boiler economizer body 1, with heat exchange tubes 2 fixedly connected inside the boiler economizer body 1, and further including: A mixing component is disposed on the side wall of the boiler economizer body 1 and is used to mix the high-temperature flue gas with the boiler evaporator flue gas that has just entered the boiler economizer body 1 through the inlet. The turbulence component is located between the boiler economizer body 1 and the mixing component, and is used to turbulent the high-temperature flue gas inside the mixing component that is about to enter the boiler economizer body 1. The mixing components facilitate the mixing of high-temperature flue gas with the boiler evaporator flue gas entering through the inlet of the boiler economizer body 1. This reduces the probability of corrosion of the heat exchange tube 2 surface by low-temperature flue gas after heat exchange between the boiler evaporator flue gas and the heat exchange tube 2. At the same time, the turbulence components facilitate the turbulence of the flue gas entering the boiler economizer body 1, thereby ensuring that the high-temperature flue gas enters the interior of the boiler economizer body 1 evenly. This improves the uniformity of the mixing between the high-temperature flue gas and the evaporator flue gas and increases the mixing efficiency.

[0016] Furthermore, the mixing component includes a mixing channel 301, which is fixedly connected to the side wall of the boiler economizer body 1. The inner wall of the boiler economizer body 1 has a flue gas inlet 302. A connection port 303 is fixedly connected to the side wall of the mixing channel 301. A flue gas inlet 304 is fixedly connected to the top surface of the boiler economizer body 1, and a flue gas outlet 305 is fixedly connected to the bottom surface of the boiler economizer body 1. An induced draft fan 306 is fixedly connected to the lower end of the flue gas outlet 305. Through this mixing component, the mixing channel 301 is connected to an external high-temperature flue gas channel via the connection port 303, thereby facilitating the introduction of external high-temperature flue gas through the flue gas inlet 302. The high-temperature flue gas enters the interior of the economizer body 1 and mixes with the flue gas from the boiler evaporator that enters through the inlet of the economizer body 1. After mixing in the mixing zone inside the economizer body 1, the temperature of the flue gas from the boiler evaporator increases, thereby reducing the probability of corrosion of the surface of the heat exchange tube 2 by the low-temperature flue gas after heat exchange between the flue gas from the boiler evaporator and the heat exchange tube 2. The flue gas is fed into the boiler evaporator through the flue gas inlet 304, mixed in the mixing zone, heat exchanged in the heat exchange zone, and then discharged through the flue gas outlet 305 under the action of the induced draft fan 306.

[0017] Furthermore, the turbulence-disrupting component includes a fixing frame 401, which is fixedly connected to the inner wall of the flue gas inlet 302. Multiple flow equalization plates 402 are fixedly connected to the inner wall of the fixing frame 401. A snap-fit ​​groove 403 is provided on the periphery of the fixing frame 401, and the inner wall of the snap-fit ​​groove 403 is fixedly connected to the inner wall of the flue gas inlet 302. Through this turbulence-disrupting component, the multiple flow equalization plates 402 on the inner wall of the fixing frame 401 facilitate the turbulence of the flue gas entering the boiler economizer body 1 through the mixing channel 301. This allows the flue gas inside the mixing channel 301 to enter the boiler economizer body 1 evenly through the flow equalization plates 402, thereby improving the uniformity of the mixing of high-temperature flue gas and evaporator flue gas and increasing mixing efficiency. The snap-fit ​​grooves 403 facilitate the snap-fit ​​and limiting of the fixing frame 401 to the flue gas inlet 302, preventing displacement of the fixing frame 401 during use and improving the stability of the uniform turbulence of the flow equalization plates 402.

[0018] Furthermore, multiple temperature sensors 309 are installed inside both the boiler economizer body 1 and the mixing channel 301. The temperature sensors 309 inside the mixing channel 301 are fixedly connected to the inner wall of the mixing channel 301, and the temperature sensors 309 inside the boiler economizer body 1 are also fixedly connected to the inner wall of the boiler economizer body 1. A flue gas controller 307 is fixedly connected to the inner wall of the mixing channel 301, and a control motor 308 is fixedly connected to the top surface of the mixing channel 301. The control shaft of the flue gas controller 307 is fixedly connected to the output end of the control motor 308. By installing multiple temperature sensors 309, which are respectively located at the inlet of the mixing channel 301, the inlet of the boiler economizer body 1, the mixing zone inside the boiler economizer body 1, the heat exchange zone inside the boiler economizer body 1, and the boiler economizer body 1... The internal low-temperature zone facilitates precise detection of the high-temperature flue gas temperature inside the mixing channel 301, the evaporator flue gas temperature at the inlet of the boiler economizer body 1, the mixing zone flue gas temperature inside the boiler economizer body 1, the heat exchange zone flue gas temperature inside the boiler economizer body 1, and the low-temperature zone flue gas temperature after heat exchange inside the boiler economizer body 1. Based on the detected flue gas temperature, the flue gas controller 307 precisely controls the flow rate of the high-temperature flue gas entering the boiler economizer body 1 through the mixing channel 301, thereby reducing the probability of corrosion of the heat exchange tube 2 surface caused by low-temperature flue gas. The flue gas controller 307 and the control motor 308 work together to facilitate the control of the flow rate of flue gas entering the boiler economizer body 1 through the mixing channel 301, thereby facilitating the adjustment of the flue gas flow rate according to specific needs.

[0019] Working principle: The flue gas from the boiler evaporator is fed into the boiler through the flue gas inlet 304, mixed in the mixing zone, and then heat-exchanged in the heat exchange zone. Finally, it is discharged through the flue gas outlet 305 under the action of the induced draft fan 306. The mixing component connects the mixing channel 301 to the external high-temperature flue gas channel via the connection port 303, which facilitates the introduction of external high-temperature flue gas into the interior of the boiler economizer body 1 through the flue gas inlet 302. The high-temperature flue gas is mixed with the boiler evaporator flue gas entering the interior of the boiler economizer body 1. After mixing in the mixing zone inside the boiler economizer body 1, the temperature of the boiler evaporator flue gas is increased, thereby reducing the probability of corrosion of the surface of the heat exchange tube 2 by the low-temperature flue gas after heat exchange between the boiler evaporator flue gas and the heat exchange tube 2.

[0020] Meanwhile, the turbulence-disrupting components facilitate the turbulence of the flue gas entering the boiler economizer body 1 through the mixing channel 301 via multiple flow equalization plates 402 on the inner wall of the fixed frame 401. This allows the flue gas inside the mixing channel 301 to enter the boiler economizer body 1 evenly through the flow equalization plates 402, thereby improving the uniformity of the mixing of high-temperature flue gas and evaporator flue gas and increasing the mixing efficiency. The snap-fit ​​groove 403 facilitates the snap-fit ​​and limiting of the fixed frame 401 with the flue gas inlet 302, thereby preventing displacement of the fixed frame 401 during use and improving the stability of the uniform turbulence of the flow equalization plates 402.

[0021] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A high-temperature flue gas circulation system for preventing waste heat corrosion of boiler economizers, comprising a boiler economizer body (1), wherein a heat exchange tube (2) is fixedly connected inside the boiler economizer body (1), characterized in that, Also includes: A mixing component is provided on the side wall of the boiler economizer body (1) for mixing high-temperature flue gas with the boiler evaporator flue gas that has just entered the boiler economizer body (1) through the inlet. A turbulence-disrupting component is disposed between the boiler economizer body (1) and the mixing component, and is used to turbulent the high-temperature flue gas entering the boiler economizer body (1) from the mixing component.

2. The high-temperature flue gas circulation system for preventing waste heat corrosion of boiler economizers according to claim 1, characterized in that: The mixing component includes a mixing channel (301), which is fixedly connected to the side wall of the boiler economizer body (1). The inner wall of the boiler economizer body (1) is provided with a flue gas inlet (302), and the side wall of the mixing channel (301) is fixedly connected with a connection port (303).

3. A high-temperature flue gas circulation system for preventing waste heat corrosion of boiler economizers according to claim 2, characterized in that: The turbulence component includes a fixing frame (401), which is fixedly connected to the inner wall of the smoke inlet (302). Multiple flow equalization plates (402) are fixedly connected to the inner wall of the fixing frame (401). The fixing frame (401) is provided with snap-fit ​​grooves (403) on its periphery. The inner wall of the snap-fit ​​grooves (403) is fixedly connected to the inner wall of the smoke inlet (302).

4. A high-temperature flue gas circulation system for preventing waste heat corrosion of boiler economizers according to claim 2, characterized in that: Multiple temperature sensors (309) are provided inside the boiler economizer body (1) and the mixing channel (301). The temperature sensors (309) located inside the mixing channel (301) are fixedly connected to the inner wall of the mixing channel (301), and the temperature sensors (309) located inside the boiler economizer body (1) are fixedly connected to the inner wall of the boiler economizer body (1).

5. A high-temperature flue gas circulation system for preventing waste heat corrosion of boiler economizers according to claim 2, characterized in that: A flue gas controller (307) is fixedly connected to the inner wall of the mixing channel (301), and a control motor (308) is fixedly connected to the top surface of the mixing channel (301). The control shaft of the flue gas controller (307) is fixedly connected to the output end of the control motor (308).

6. A high-temperature flue gas circulation system for preventing waste heat corrosion of boiler economizers according to claim 2, characterized in that: The top surface of the boiler economizer body (1) is fixedly connected to a flue gas inlet (304), the bottom surface of the boiler economizer body (1) is fixedly connected to a flue gas outlet (305), and the lower end of the flue gas outlet (305) is fixedly connected to an induced draft fan (306).

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