Air-cooling flue gas heat exchanger
By designing an air-cooled flue gas heat exchanger, the high-temperature and low-temperature heat exchange sections are used to reduce the flue gas temperature, the problem of high residual temperature of the flue gas is solved, the desulfurization effect is improved and the equipment life is extended.
Patent Information
- Application Number
- CN202422328819.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-24
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2034-09-24
AI Technical Summary
In the prior art, the residual temperature after the heat energy of the flue gas is recovered is high, resulting in unsatisfactory desulfurization effect and shortening the life of the desulfurization system.
An air-cooled flue gas heat exchanger is designed, including a flue gas inlet transformer, a high-temperature heat exchange section, a first flue gas connection box, a low-temperature heat exchange section and a flue gas outlet transformer. The flue gas temperature is reduced to meet the requirements of the desulfurization process through the high-temperature and low-temperature heat exchange sections, and a flue gas connection box is set up to discharge accumulated water and clean dust.
Effectively reduce the flue gas temperature to the desulfurization process requirements, improve the desulfurization effect and extend the service life of the desulfurization system, and prevent equipment corrosion and water accumulation.
Smart Images
Figure CN223154047U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of flue gas desulfurization, and particularly relates to an air-cooled flue gas heat exchanger.
Background Art
[0002] In the production processes such as steel rolling and iron smelting in the metallurgical industry, many hot blast stoves, heating furnaces, combustion furnaces, and boilers are used. A large amount of flue gas is generated during the operation of these devices. This part of the flue gas contains a large amount of nitrogen oxides and sulfur oxides, which are also one of the main sources of air pollution. The current production process flow is to heat the combustion-supporting air and blast furnace gas through an air / gas preheater for this part of the flue gas. Currently, most of the waste flue gas after heat energy recovery is directly discharged into the atmosphere.
[0003] According to the current environmental protection requirements, this part of the flue gas needs to enter the desulfurization system for treatment again before it can be discharged into the atmosphere. However, the residual temperature of the flue gas after heat energy recovery through the air / gas preheater is still relatively high. This temperature is not ideal for the current desulfurization process in terms of desulfurization effect, and it is easy to significantly reduce the service life of the components inside the desulfurization system, increasing the cost expenditure of enterprises for this part. Therefore, it is necessary to reduce the temperature of this part of the flue gas to meet the temperature requirements of the current desulfurization process before entering the desulfurization system.
[0004] In view of this, this case conducts in-depth research on the above problems, and thus this case is generated.
Content of the Utility Model
[0005] The utility model aims to solve the technical problem in the prior art that the residual temperature of the flue gas after heat energy recovery is relatively high, resulting in an unsatisfactory desulfurization effect of the desulfurization process and significantly reducing the service life of the internal components of the desulfurization system. It provides an air-cooled flue gas heat exchanger, which introduces high-temperature flue gas into the air-cooled flue gas heat exchanger to reduce the temperature of the flue gas to meet the temperature requirements of the desulfurization process, improve the desulfurization effect, and increase the service life of the desulfurization system.
[0006] The utility model is realized as follows: An air-cooled flue gas heat exchanger includes a heat exchanger body. The heat exchanger body includes a flue gas inlet reducer pipe, a high-temperature heat exchange section, a first flue gas header, a low-temperature heat exchange section, a second flue gas header, and a flue gas outlet reducer pipe that are fixedly connected in sequence. The high-temperature flue gas enters from the flue gas inlet reducer pipe and passes through the high-temperature heat exchange section, the first flue gas header, the low-temperature heat exchange section, and the second flue gas header in sequence, and then is discharged from the flue gas outlet reducer pipe.
[0007] Further, a first cold air channel for cold air to enter the heat exchanger body from bottom to top is formed in the high-temperature heat exchange section. A first cold air reducer is provided at the top of the high-temperature heat exchange section, and a first fan is fixedly provided at the top of the first cold air reducer; the high-temperature heat exchange section is respectively communicated with a flue gas inlet reducer, a first flue gas header, and a first cold air reducer.
[0008] Further, a second cold air channel for cold air to enter the heat exchanger body from bottom to top is formed in the low-temperature heat exchange section. A second cold air reducer is provided at the top of the low-temperature heat exchange section, and a second fan is fixedly provided at the top of the second cold air reducer; the low-temperature heat exchange section is respectively communicated with the first flue gas header, a second flue gas header, and a second cold air reducer.
[0009] Further, a first drain port is opened at the bottom of the first flue gas header.
[0010] Further, a first inspection door is opened on the first flue gas header.
[0011] Further, a second drain port is opened at the bottom of the second flue gas header.
[0012] Further, a second inspection door is opened on the second flue gas header.
[0013] The advantages of the present utility model are as follows:
[0014] 1. The air-cooled flue gas heat exchanger of the present utility model introduces high-temperature flue gas into the heat exchanger body, and passes through two stages of a high-temperature heat exchange section and a low-temperature heat exchange section in sequence, reducing the flue gas temperature to a temperature meeting the requirements of the desulfurization process, improving the desulfurization effect and increasing the service life of the desulfurization system.
[0015] 2. The present utility model has the following beneficial technical effects by arranging a second flue gas header between the high-temperature heat exchange section and the low-temperature heat exchange section: the flue gas first passes through the high-temperature heat exchange section to reduce its temperature by a certain amount, and then passes through the low-temperature heat exchange section to reduce its temperature to a temperature meeting the requirements of the desulfurization process; since the flue gas temperature is lowered to the dew point temperature during the temperature reduction, a large amount of water will be diluted out. If this part of the water accumulates in the equipment for a long time, the internal environment of the equipment will become humid, and in addition, the flue gas contains a large amount of nitrogen oxides and sulfur oxides, which will cause corrosion to the equipment, thus affecting the service life of the equipment. Therefore, a first flue gas header is arranged between the high-temperature heat exchange section and the low-temperature heat exchange section, and a first drain port is arranged at the bottom of the first flue gas header to relieve this situation by draining water regularly; after the second flue gas header has been in production operation for a certain period of time, a large amount of dust may adhere to the internal components. Then, during maintenance, the inside of the second flue gas header can be entered through the second inspection door, and special cleaning tools can be used to clean it. The water and dirt washed down can be discharged outside the equipment through the second drain port.
Description of the Drawings
[0016] The present utility model will be further described below with reference to the accompanying drawings and embodiments.
[0017] Figure 1 It is a schematic structural view of the air-cooled flue gas heat exchanger of the present utility model.
[0018] Figure 2 It is a left view of the air-cooled flue gas heat exchanger of the present utility model.
[0019] Figure 3 It is a top view of the air-cooled flue gas heat exchanger of the present utility model.
[0020] Heat exchanger body 1, flue gas inlet reducer 2, high-temperature heat exchange section 3, first flue gas header 4, low-temperature heat exchange section 5, second flue gas header 6, flue gas outlet reducer 7, first cold air channel 8, first cold air reducer 9, first fan 10, second cold air channel 11, second cold air reducer 12, second fan 13, first drain port 14, first inspection door 15, second drain port 16, second inspection door 17.
Specific Embodiments
[0021] In order to better understand the technical solution of the present utility model, the technical solution of the present utility model will be described in detail below in conjunction with the accompanying drawings of the specification and specific embodiments.
[0022] It should be noted here that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing these embodiments and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features.
[0023] Please refer to Figures 1 to 3 As shown, the present utility model provides an air-cooled flue gas heat exchanger, including a heat exchanger body 1. The heat exchanger body 1 includes a flue gas inlet reducer 2, a high-temperature heat exchange section 3, a first flue gas header 4, a low-temperature heat exchange section 5, a second flue gas header 6, and a flue gas outlet reducer 7 that are fixedly connected in sequence. High-temperature flue gas enters from the flue gas inlet reducer 2, passes through the high-temperature heat exchange section 3, the first flue gas header 4, the low-temperature heat exchange section 5, and the second flue gas header 6 in sequence, and then is discharged from the flue gas outlet reducer 7.
[0024] In the utility model, a first cold air channel 8 for cold air to enter the heat exchanger body 1 from bottom to top is formed in the high-temperature heat exchange section 3. A first cold air reducer 9 is provided at the top of the high-temperature heat exchange section 3, and a first fan 10 is fixedly provided at the top of the first cold air reducer 9. The high-temperature heat exchange section 3 is respectively communicated with a flue gas inlet reducer 2, a first flue gas header 4, and a first cold air reducer 9.
[0025] In the utility model, a second cold air channel 11 for cold air to enter the heat exchanger body 1 from bottom to top is formed in the low-temperature heat exchange section 5. A second cold air reducer 12 is provided at the top of the low-temperature heat exchange section 5, and a second fan 13 is fixedly provided at the top of the second cold air reducer 12. The low-temperature heat exchange section 5 is respectively communicated with the first flue gas header 4, a second flue gas header 6, and a second cold air reducer 12.
[0026] The air-cooled flue gas heat exchanger of the present utility model introduces high-temperature flue gas into the heat exchanger body, and successively passes through two stages of a high-temperature heat exchange section 3 and a low-temperature heat exchange section 5 to reduce the temperature of the flue gas to a temperature meeting the requirements of the desulfurization process, improve the desulfurization effect, and increase the service life of the desulfurization system.
[0027] In the utility model, a first drain port 14 is opened at the bottom of the first flue gas header 4. The flue gas first passes through the high-temperature heat exchange section 3 to reduce its temperature by a certain amount. Since the temperature of the flue gas drops to the dew point temperature when cooling in the high-temperature heat exchange section 3, a large amount of water will be diluted. If this part of the water accumulates in the equipment for a long time, the internal environment of the equipment will become humid. Coupled with the fact that the flue gas contains a large amount of nitrogen oxides and sulfur oxides, it will cause corrosion to the equipment, thereby affecting the service life of the equipment. Therefore, a first flue gas header 4 is provided between the high-temperature heat exchange section 3 and the low-temperature heat exchange section 5, and a first drain port 14 is provided at the bottom of the first flue gas header 4 to relieve this situation by draining regularly.
[0028] In the utility model, a first inspection door 15 is opened on the first flue gas header 4. After the first flue gas header 4 has been in production operation for a certain period of time, a large amount of dust may adhere to the internal components. Then, during maintenance, it is possible to enter the inside of the first flue gas header 4 through the first inspection door 15 and use special cleaning tools to clean it. The water and dirt washed down can be discharged outside the equipment through the first drain port 14.
[0029] In the utility model, a second drain port 16 is opened at the bottom of the second flue gas header 6. A second drain port 16 is provided at the bottom of the second flue gas header 6 for regular drainage.
[0030] A second inspection door 17 is provided on the second flue gas header 6. After the second flue gas header 6 has been in production operation for a certain period of time, a large amount of dust may accumulate on the internal components. During maintenance, it is possible to enter the interior of the second flue gas header 6 through the second inspection door 17 and use special cleaning tools to clean it. The water and dirt washed off can be discharged outside the equipment through the second drain port 16.
[0031] Working principle: High-temperature flue gas enters the heat exchanger body 1 from the flue gas inlet reducer pipe 2, and then the flue gas is cooled through the high-temperature heat exchange section 3 and the low-temperature heat exchange section 5. After the flue gas temperature drops to meet the desulfurization process temperature, it is sent to the desulfurization system for reaction through the flue gas outlet reducer pipe 7. The cooling medium in the air-cooled flue gas heat exchanger is cold air (cooling air). The cold air enters the first cold air channel 8 through the action of the first fan 10 to cool the flue gas at the high-temperature heat exchange section 3, and enters the second cold air channel 11 through the action of the second fan 13 to cool the flue gas at the high and low-temperature heat exchange section 5, and finally is directly discharged into the atmosphere.
[0032] Although the specific embodiments of the present invention have been described above, those skilled in the art should understand that the specific embodiments we described are illustrative rather than used to limit the scope of the present invention. Equivalent modifications and variations made by those skilled in the art in accordance with the spirit of the present invention should be covered by the scope protected by the claims of the present invention.
Claims
1. An air-cooled flue gas heat exchanger, comprising a heat exchanger body, characterized in that: The heat exchanger body includes a flue gas inlet reducer pipe, a high-temperature heat exchange section, a first flue gas header, a low-temperature heat exchange section, a second flue gas header, and a flue gas outlet reducer pipe that are fixedly connected in sequence; high-temperature flue gas enters from the flue gas inlet reducer pipe, passes through the high-temperature heat exchange section, the first flue gas header, the low-temperature heat exchange section, and the second flue gas header in sequence, and then is discharged from the flue gas outlet reducer pipe. A first drain port is provided at the bottom of the first flue gas header; a first inspection door is provided on the first flue gas header; a second drain port is provided at the bottom of the second flue gas header; a second inspection door is provided on the second flue gas header.
2. The air-cooled flue gas heat exchanger according to claim 1, wherein: The high-temperature heat exchange section forms a first cold air passage for cold air to enter the heat exchanger body from bottom to top. A first cold air reducer pipe is provided at the top of the high-temperature heat exchange section, and a first fan is fixedly provided at the top of the first cold air reducer pipe; the high-temperature heat exchange section is respectively communicated with the flue gas inlet reducer pipe, the first flue gas header, and the first cold air reducer pipe.
3. The air-cooled flue gas heat exchanger according to claim 2, wherein: The low-temperature heat exchange section forms a second cold air passage for cold air to enter the heat exchanger body from bottom to top. A second cold air reducer pipe is provided at the top of the low-temperature heat exchange section, and a second fan is fixedly provided at the top of the second cold air reducer pipe; the low-temperature heat exchange section is respectively communicated with the first flue gas header, the second flue gas header, and the second cold air reducer pipe.