Smoke exhaust device of heating furnace

Abstract

Provided is a heating furnace smoke exhaust device. The problems that an existing heating furnace is high in smoke exhaust stability, and energy is wasted are solved. The device comprises a heating furnace; the air preheater is used for preheating air passing through the air preheater; the first fan is connected with the air preheater; the fuel gas preheater is used for preheating the fuel gas passing through the fuel gas preheater; the fuel gas preheater comprises a fuel gas channel and a second preheating channel; an outlet of the second preheating channel on the fuel gas preheater is connected with the air preheater through a first pipeline and used for preheating air passing through the air preheater. And the chimney is connected with an outlet of the first preheating channel of the air preheater and is used for discharging flue gas. The utility model has the beneficial effects that the air preheater and the fuel gas preheater are arranged, so that the flue gas in the fuel gas preheater can be reutilized to heat the cavity preheater, the energy consumption is reduced, the energy is saved, the environment is protected, and the flue gas emission temperature is reduced.

Description

Technical Field

[0001] The utility model relates to a smoke exhaust device for a heating furnace. Background Art

[0002] The flue gas waste heat recovery system for the cylindrical furnace of the continuous reforming unit utilizes a portion of the flue gas (approximately 1 / 5) generated by the heating furnace to heat the square furnace fuel gas through a fuel gas preheater. After the fuel gas is heated, it enters the reactor for desulfurization. Effective reaction requires the fuel gas temperature to be controlled above 225°C. To achieve this temperature, the flue gas temperature after heat exchange in the fuel gas preheater reaches as high as 175°C. This causes the flue gas temperature after heat exchange in the cylindrical furnace air preheater and mixing with the fuel gas to reach as high as 140°C. To prevent dew point corrosion in the air preheater, simply lowering the exhaust temperature of the cylindrical furnace air preheater is not feasible. This excessively high exhaust temperature results in significant energy waste. Utility Model Content

[0003] In order to solve the problem in the background technology that the smoke exhaust of the existing heating furnace is high in stability and causes energy waste, the utility model provides a smoke exhaust device for the heating furnace.

[0004] The technical solution of the utility model is: a fume exhaust device for a heating furnace, comprising a heating furnace, and further comprising:

[0005] An air preheater is used to preheat air passing through the air preheater; the air preheater includes an air channel and a first preheating channel; the air channel on the air preheater is connected to the inlet of the heating furnace; the outlet of the heating furnace is connected to the first preheating channel on the air preheater, and the outlet flue gas of the heating furnace is used to preheat the air passing through the air preheater;

[0006] a first fan connected to the air preheater and used to deliver air to the heating furnace through the air preheater;

[0007] A fuel gas preheater is configured to preheat the fuel gas passing through the fuel gas preheater; the fuel gas preheater comprises a fuel gas channel and a second preheating channel; the outlet of the heating furnace is connected to the second preheating channel of the fuel gas preheater, and the flue gas at the outlet of the heating furnace is used to preheat the fuel gas passing through the fuel gas preheater; the fuel gas channel on the fuel gas preheater is connected to the reactor; the outlet of the second preheating channel on the fuel gas preheater is connected to the inlet of the first preheating channel on the air preheater via a first pipeline for preheating the air passing through the air preheater;

[0008] A chimney is connected to the outlet of the first preheating channel of the air preheater and is used for exhausting flue gas.

[0009] As a further improvement of the present invention, it also includes a first regulating baffle, which is arranged between the outlet of the heating furnace and the first preheating channel of the air preheater, and is used to regulate the amount of flue gas entering the first preheating channel from the outlet of the heating furnace.

[0010] As a further improvement of the present invention, the outlet of the first pipeline is arranged behind the first adjustment baffle.

[0011] As a further improvement of the present invention, it also includes a second adjusting baffle, which is arranged between the outlet of the heating furnace and the second preheating channel of the fuel gas preheater, and is used to adjust the amount of flue gas entering the second preheating channel from the outlet of the heating furnace. The second adjusting baffle and the first adjusting baffle cooperate with each other to adjust the amount of flue gas at the inlet of the air preheater.

[0012] As a further improvement of the present invention, it also includes a third regulating baffle, which is arranged at the outlet of the second preheating channel of the fuel gas preheater; the third regulating baffle and the first regulating baffle cooperate with each other to regulate the flue gas volume at the inlet of the air preheater.

[0013] As a further improvement of the present invention, it further includes a first sealing baffle, which is arranged on the first pipeline. The first sealing baffle has a first position that is normally open so that the second preheating channel is connected to the first preheating channel and a second position that is closed.

[0014] As a further improvement of the present invention, it also includes a second sealing baffle, which is arranged at the outlet of the second preheating channel. The second sealing baffle has a first position that is normally closed and a second position that is opened to connect the second preheating channel to the chimney.

[0015] As a further improvement of the present invention, a second fan is further included for discharging the flue gas at the outlet of the first preheating channel and the flue gas at the outlet of the second preheating channel toward the chimney.

[0016] As a further improvement of the present invention, the second fan is arranged behind the second sealing baffle.

[0017] As a further improvement of the present invention, the first fan is a blower, and the second fan is an induced draft fan.

[0018] The beneficial effects of this utility model are that the air preheater and the fuel gas preheater are provided, and the flue gas in the fuel gas preheater can be reused to heat the cavity preheater, thereby reducing energy consumption, saving energy and protecting the environment, and lowering the flue gas emission temperature. The utility model also has the advantages of simple structure, easy assembly, reliable operation, and long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Attachment Figure 1 It is a structural schematic diagram of an embodiment of the present utility model.

[0020] In the figure, 1. heating furnace; 2. air preheater; 3. first fan; 4. fuel gas preheater; 5. chimney; 6. first regulating baffle; 7. second regulating baffle; 8. third regulating baffle; 9. first sealing baffle; 10. second sealing baffle; 11. second fan; 12. first pipeline; 13. reactor. DETAILED DESCRIPTION

[0021] The following is a further description of the embodiments of the present invention in conjunction with the accompanying drawings:

[0022] Depend on Figure 1 As shown, a fume exhaust device for a heating furnace includes a heating furnace 1 and further includes:

[0023] The air preheater 2 is configured to preheat air passing through the air preheater. The air preheater includes an air channel and a first preheating channel. The air channel of the air preheater is connected to the inlet of the heating furnace. The outlet of the heating furnace is connected to the first preheating channel of the air preheater, and the flue gas at the outlet of the heating furnace is used to preheat the air passing through the air preheater. Specifically, the air channel and the first preheating channel can be a combination of a chamber and a tube. When heated flue gas flows through the tube, air flows through the chamber, or when heated flue gas flows through the chamber, air flows through the tube.

[0024] The first fan 3 is connected to the air preheater and is used to send the air preheated by the air preheater to the heating furnace; specifically, the first fan is used to send the air into the air channel;

[0025] A fuel gas preheater 4 is configured to preheat the fuel gas passing through the fuel gas preheater; the fuel gas preheater includes a fuel gas channel and a second preheating channel; the outlet of the heating furnace is connected to the second preheating channel of the fuel gas preheater, and the flue gas from the heating furnace outlet is used to preheat the fuel gas passing through the fuel gas preheater; the fuel gas channel on the fuel gas preheater is connected to the reactor 13; the outlet of the second preheating channel on the fuel gas preheater is connected to the inlet of the first preheating channel on the air preheater via a first pipeline 12, for preheating the air passing through the air preheater;

[0026] Chimney 5 is connected to the outlet of the first preheating channel of the air preheater and is used for flue gas discharge. The beneficial effect of this utility model is that the provision of an air preheater and a fuel gas preheater allows the flue gas in the fuel gas preheater to be reused to heat the cavity preheater, reducing energy consumption, saving energy and protecting the environment, and lowering the flue gas discharge temperature. This utility model also has the advantages of a simple structure, easy assembly, reliable operation, and a long service life.

[0027] The utility model can reduce the exhaust temperature of the heating furnace and maximize the recovery of waste heat from the flue gas. The flue gas that has passed through the fuel gas preheater is now reintroduced into the cylindrical furnace air preheater, so that the fuel gas preheater and the cylindrical furnace air preheater are used in series. The heat of the flue gas preheated by the fuel gas is recovered for a second time, which can increase the air temperature entering the cylindrical furnace to a certain extent. At the same time, it can ensure that the final exhaust temperature of the heating furnace is controlled within 120°C. Under the same load, the device saves about 80 standard cubic meters of fuel gas per hour (referring to the gas volume per hour at 0 degrees Celsius and 1 standard atmospheric pressure), thereby achieving energy saving.

[0028] The present invention also includes a first regulating baffle 6, located between the outlet of the heating furnace and the first preheating channel of the air preheater, for regulating the amount of flue gas entering the first preheating channel from the outlet of the heating furnace. Specifically, the outlet of the first pipeline is located behind the first regulating baffle. More specifically, the present invention also includes a second regulating baffle 7, located between the outlet of the heating furnace and the second preheating channel of the fuel gas preheater, for regulating the amount of flue gas entering the second preheating channel from the outlet of the heating furnace. The second regulating baffle and the first regulating baffle cooperate to regulate the amount of flue gas at the inlet of the air preheater. The first regulating baffle at the inlet of the air preheater and the second regulating baffle on the inlet side of the fuel gas preheater jointly regulate the flow ratio of the hot flue gas to the air preheater and the fuel gas preheater. The second regulating baffle on the inlet side of the fuel gas preheater must be kept fully open. The opening of the first regulating baffle of the flue gas at the inlet of the air preheater is adjusted by the high-pressure gas temperature of the fuel gas preheater and with reference to the load of the second fan.

[0029] The present invention also includes a third regulating baffle 8, which is located at the outlet of the second preheating channel of the fuel gas preheater. The third regulating baffle cooperates with the first regulating baffle to regulate the amount of flue gas entering the air preheater. The third regulating baffle can regulate the flue gas at the outlet of the second preheating channel of the fuel gas preheater, thereby facilitating control of the amount of flue gas entering the air preheater.

[0030] The present invention also includes a first sealing baffle 9, disposed on the first pipeline. The first sealing baffle has a first position (normally open) connecting the second preheating channel to the first preheating channel, and a second position (closed). Specifically, the present invention also includes a second sealing baffle 10, disposed at the outlet of the second preheating channel. The second sealing baffle has a first position (normally closed) and a second position (open) connecting the second preheating channel to the chimney. The present invention also includes a second fan 11, which is used to discharge flue gas from the outlets of the first and second preheating channels toward the chimney. Specifically, the second fan is disposed behind the second sealing baffle. More specifically, the first fan is a blower, and the second fan is an induced draft fan. A first pipeline is provided, and a first sealing baffle is disposed on the first pipeline. The first pipeline is added between the outlet flue of the fuel gas preheater and the inlet flue of the air preheater. Two manual sealing baffles (a first sealing baffle and a second sealing baffle) are also provided. Under normal operating conditions, the first sealing damper on the first pipeline is fully open, while the second sealing damper is fully closed. The outlet flue of the second preheating channel of the fuel gas preheater (downstream of the crossover line) is connected to the first preheating channel of the air preheater, connecting the fuel gas preheater and air preheater in series and reducing heat waste. Under abnormal operating conditions (such as fan failure and insufficient static pressure), the second sealing damper is fully open and the first sealing damper is fully closed, ensuring reliable flue gas discharge and enhancing safety.

[0031] In the description of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific direction, be constructed, or operate in a specific direction. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified or limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0033] Technical personnel please note: Although the utility model has been described according to the above specific implementation methods, the utility model concept is not limited to this utility model. Any modification using the utility model concept will be included in the scope of protection of the utility model patent right.

Claims

1. A fume exhaust device for a heating furnace, comprising a heating furnace, characterized in that Also includes: An air preheater is used to preheat air passing through the air preheater; the air preheater includes an air channel and a first preheating channel; the air channel on the air preheater is connected to the inlet of the heating furnace; the outlet of the heating furnace is connected to the first preheating channel on the air preheater, and the outlet flue gas of the heating furnace is used to preheat the air passing through the air preheater; a first fan connected to the air preheater and used to deliver air to the heating furnace through the air preheater; A fuel gas preheater is configured to preheat the fuel gas passing through the fuel gas preheater; the fuel gas preheater comprises a fuel gas channel and a second preheating channel; the outlet of the heating furnace is connected to the second preheating channel of the fuel gas preheater, and the flue gas at the outlet of the heating furnace is used to preheat the fuel gas passing through the fuel gas preheater; the fuel gas channel on the fuel gas preheater is connected to the reactor; the outlet of the second preheating channel on the fuel gas preheater is connected to the inlet of the first preheating channel on the air preheater via a first pipeline for preheating the air passing through the air preheater; A chimney is connected to the outlet of the first preheating channel of the air preheater and is used for exhausting flue gas.

2. A heating furnace smoke exhaust device according to claim 1, characterized in that It also includes a first regulating baffle, which is arranged between the outlet of the heating furnace and the first preheating channel of the air preheater and is used to regulate the amount of flue gas entering the first preheating channel from the outlet of the heating furnace.

3. A heating furnace smoke exhaust device according to claim 2, characterized in that The outlet of the first pipeline is arranged behind the first regulating baffle.

4. A heating furnace fume exhaust device according to claim 2, characterized in that It also includes a second regulating baffle, which is arranged between the outlet of the heating furnace and the second preheating channel of the fuel gas preheater, and is used to regulate the amount of flue gas entering the second preheating channel from the outlet of the heating furnace. The second regulating baffle and the first regulating baffle cooperate with each other to regulate the amount of flue gas at the inlet of the air preheater.

5. A heating furnace fume exhaust device according to claim 4, characterized in that It also includes a third regulating baffle, which is arranged at the outlet of the second preheating channel of the fuel gas preheater; the third regulating baffle and the first regulating baffle cooperate with each other to regulate the flue gas volume at the inlet of the air preheater.

6. A heating furnace fume exhaust device according to claim 1, characterized in that It also includes a first sealing baffle, which is arranged on the first pipeline. The first sealing baffle has a first position that is normally open so that the second preheating channel is connected to the first preheating channel and a second position that is closed.

7. A heating furnace fume exhaust device according to claim 1, characterized in that It also includes a second sealing baffle, which is arranged at the outlet of the second preheating channel. The second sealing baffle has a first position that is normally closed and a second position that is opened to connect the second preheating channel to the chimney.

8. The fume exhaust device for a heating furnace according to claim 1, characterized in that It also includes a second fan for discharging the flue gas at the outlet of the first preheating channel and the flue gas at the outlet of the second preheating channel to the chimney.

9. A heating furnace fume exhaust device according to claim 8, characterized in that The second fan is arranged behind the second sealing baffle.

10. A heating furnace fume exhaust device according to claim 8, characterized in that The first fan is a blower, and the second fan is an induced draft fan.

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