Flue gas heat exchange device

Abstract

A flue gas heat exchange device comprises a box body, a main air releasing pipeline and an auxiliary air releasing pipeline, the main air releasing pipeline and the auxiliary air releasing pipeline both penetrate through the box body from top to bottom, a filtering mechanism is arranged outside one side of the box body, a conveying pipe is arranged in the box body, and one end of the conveying pipe penetrates through the bottom end of one side of the box body and is connected with the filtering mechanism; one side of the filtering mechanism is connected with an air outlet of the flue gas heat exchanger through a pipeline, the other end of the conveying pipe penetrates through the top end of one side of the box body, the conveying pipe is wound on the main air releasing pipeline and the auxiliary air releasing pipeline, the bottom end of the box body is connected with a condensate water discharging pipe, and the other side of the box body is provided with a temperature control mechanism. When the main air releasing pipeline goes wrong, the auxiliary air releasing pipeline is started, and the auxiliary air releasing pipeline can be heated through heat in the box body.

Description

Technical Field

[0001] The utility model belongs to the technical field of heat exchange equipment, and specifically relates to a flue gas heat exchange device. Background Art

[0002] As one of the important ways to supply ammonia for denitrification, urea hydrolysis process has been more and more widely used in power plant denitrification projects in recent years. The dilution air system matched with urea hydrolysis needs to use a low-dust air source above 160°C. The flue gas heat exchange dilution air system has the advantages of safety, stability, high efficiency and energy saving. The dilution air temperature of the currently commonly used flue gas heat exchange dilution air system is affected by the unit operating load and cannot be adjusted. The unstable dilution air temperature will cause the actual dilution air flow to fluctuate, thus affecting the denitrification effect.

[0003] Moreover, in the existing method, steam heat exchange is used, which may cause omissions and fail to meet the temperature requirements, or electric heating is used, which increases energy consumption, thus causing problems in use. Utility Model Content

[0004] In order to solve the above-mentioned deficiencies in the prior art, the utility model provides a flue gas heat exchange device.

[0005] The present application proposes a flue gas heat exchange device, comprising a box body, a main air release duct, and an auxiliary air release duct. The main air release duct and the auxiliary air release duct both pass through the box body from top to bottom. A filtering mechanism is arranged on the outside of one side of the box body. A delivery pipe is arranged in the box body. One end of the delivery pipe passes through the bottom end of one side of the box body and is connected to the filtering mechanism. One side of the filtering mechanism is connected to the air outlet of the flue gas heat exchanger through a pipe. The other end of the delivery pipe passes through the top end of one side of the box body. The delivery pipe is wound around the main air release duct and the auxiliary air release duct. The bottom end of the box body is connected to the condensate discharge pipe. A temperature control mechanism is arranged on the other side of the box body.

[0006] Specifically, the filtering mechanism includes a box body, a filter plate is arranged in the box body, telescopic rods are arranged on the inner walls at the upper and lower ends of the box body, and shielding plates are arranged on the inner wall of one side of the box body. Slide grooves are respectively provided at the opposite ends of the two shielding plates, and sliders that always move in the slide grooves are arranged in the slide grooves. The movable end of the telescopic rod is movably connected to the outer side of the corresponding slider.

[0007] Specifically, the temperature control mechanism includes a window on the inner wall of the other side of the box, a cover plate is arranged in the window, the top outer wall of the other side of the box is connected to the air inlet duct, and the bottom outer wall of the other side of the box is connected to the air outlet duct.

[0008] Specifically, a filter screen is arranged at one end of the air inlet pipe, and the filter screen is located in the box.

[0009] Compared with the prior art, the utility model has the following beneficial effects:

[0010] The hot gas in the flue gas heat exchanger is transported to the filter mechanism through a pipeline, and the gas is filtered again by the components in the filter mechanism to make the gas better meet the emission standards. The filtered gas enters the delivery pipe and flows in the delivery pipe, causing the temperature in the box to rise. The dilution air in the main air release duct is affected by the temperature in the box, and the temperature of the dilution air rises, reducing the loss of electric heating or steam heating. That is, the waste heat in the flue gas is utilized, and the dilution air can be heated. It has various functions. When the temperature in the box exceeds the required temperature, the temperature control mechanism starts to work to cool down the temperature in the box to avoid the temperature in the box being too high, and also prevents the dilution air temperature from being too high. The condensed water generated on the outer wall of the main air release duct naturally drips and is discharged from the condensed water discharge pipe to avoid the storage of condensed water in the box. When there is a problem with the main air release duct, the auxiliary air release duct is started, and the auxiliary air release duct can also be heated by the heat in the box. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0012] Figure 1 It is a structural schematic diagram of the utility model. DETAILED DESCRIPTION

[0013] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of 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.

[0014] A flue gas heat exchange device, such as Figure 1As shown, it includes a box body 1, a main air release duct 2, and an auxiliary air release duct 4. The main air release duct 2 and the auxiliary air release duct 4 both pass through the box body 1 from top to bottom. A filtering mechanism is arranged on the outside of one side of the box body 1. A delivery pipe 3 is arranged in the box body 1. One end of the delivery pipe 3 passes through the bottom end of one side of the box body 1 and is connected to the filtering mechanism. One side of the filtering mechanism is connected to the air outlet of the flue gas heat exchanger through a pipe. The other end of the delivery pipe 3 passes through the top end of one side of the box body 1. The delivery pipe 3 is wound around the main air release duct 2 and the auxiliary air release duct. The bottom end of the box body 1 is connected to the condensate discharge pipe. A temperature control mechanism is arranged on the other side of the box body 1. A temperature sensor is arranged in the box body 1. The gas with heat in the flue gas heat exchanger is transported to the filtering mechanism through a pipeline. The gas is filtered again by the components in the filtering mechanism to make the gas better meet the emission standards. The filtered gas enters the conveying pipe 3 and flows in the conveying pipe 3, so that the temperature in the box body 1 rises. The dilution air in the main air release duct 2 is affected by the temperature in the box body 1. The temperature of the dilution air rises, which reduces the loss of electric heating or steam heating. That is, the waste heat in the flue gas is utilized, and the dilution air can be heated. It has various functions. When the temperature in the box body 1 exceeds the required temperature, the temperature control mechanism starts to work to cool down the temperature in the box body 1 to avoid the temperature in the box body from being too high, and also to prevent the dilution air temperature from being too high. The condensed water generated on the outer wall of the main air release duct naturally drips and is discharged from the condensed water discharge pipe to avoid the storage of condensed water in the box body 1. When there is a problem with the main air release duct, the auxiliary air release duct is started, and the auxiliary air release duct can also be heated by the heat in the box body.

[0015] Specifically, the filtering mechanism described in this embodiment includes a box body 5, a filter plate 6 is arranged in the box body 5, a telescopic rod 7 is arranged on the inner wall of the upper and lower ends of the box body 5, a shielding plate 8 is arranged on the inner wall of one side of the box body 5, and a slide groove is respectively provided at the opposite ends of the two shielding plates 8, and a slider that always moves in the slide groove is arranged in the slide groove, and the movable end of the telescopic rod 7 is movably connected with the outer side of the corresponding slider. The filter plate 6 can be an activated carbon filter plate, and the two shielding plates 8 are respectively located at the upper and lower ends of the conveying pipe 3. The gas in the flue gas heat exchanger first passes through the filter plate 6 and enters the right space of the box body 5. When the temperature in the box body 1 is too high, the two telescopic rods 7 are extended to control the shielding plate 8 to be folded around the hinge point with the box body 5, that is, the two shielding plates 8 are relatively folded to block the gas, so that the amount of gas entering the conveying pipe is reduced, the conveying is reduced, and the temperature in the box body 1 is reduced. Moreover, by folding the two shielding plates 8, the gas flow in the conveying pipe can also be controlled, and different flow rates can be selected according to needs.

[0016] Furthermore, the temperature control mechanism described in this embodiment includes a window on the inner wall of the other side of the box body 1, a cover plate 9 is arranged in the window, the outer wall of the top end of the other side of the box body 1 is connected to the air inlet pipe 10, and the outer wall of the bottom end of the other side of the box body 1 is connected to the air outlet pipe 11. When the temperature in the box body 1 exceeds the set temperature, and the excess is not large, cooling air enters the box body 1 from the air inlet pipe 10 to cool down the temperature in the box body 1, and the gas flows out from the air outlet pipe 11. When the temperature exceeds the set temperature, and the excess is large, the cover plate 9 is opened to allow hot air to flow out from the larger window to quickly cool down. The selection is made according to needs. When not in use, the air inlet pipe 10 and the air outlet pipe 11 are in a closed state.

[0017] Furthermore, a filter screen 12 is provided at one end of the air inlet pipe 10 of the present embodiment, and the filter screen 12 is located in the box body 1. Through the interception of the filter screen 12, impurities can be prevented from entering the box body 1, so that the box body 1 is clean.

[0018] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A flue gas heat exchange device, characterized in that: The invention comprises a box body (1), a main air release duct (2), and an auxiliary air release duct (4), wherein the main air release duct (2) and the auxiliary air release duct (4) both pass through the box body (1) from top to bottom, a filtering mechanism is arranged outside one side of the box body (1), a delivery pipe (3) is arranged inside the box body (1), one end of the delivery pipe (3) passes through the bottom end of one side of the box body (1) and is connected to the filtering mechanism, one side of the filtering mechanism is connected to the air outlet of the flue gas heat exchanger through a pipe, the other end of the delivery pipe (3) passes through the top end of one side of the box body (1), the delivery pipe (3) is wound around the main air release duct (2) and the auxiliary air release duct, the bottom end of the box body (1) is connected to a condensate discharge pipe, and a temperature control mechanism is arranged on the other side of the box body (1).

2. A flue gas heat exchange device according to claim 1, characterized in that: The filtering mechanism comprises a box body (5), a filtering plate (6) is arranged in the box body (5), telescopic rods (7) are respectively arranged on the inner walls of the upper and lower ends of the box body (5), a shielding plate (8) is respectively arranged on the inner wall of one side of the box body (5), and slide grooves are respectively provided at the opposite ends of the two shielding plates (8), and a slider that always moves in the slide groove is arranged in the slide groove, and the movable end of the telescopic rod (7) is movably connected to the outer side of the corresponding slider.

3. A flue gas heat exchange device according to claim 1, characterized in that: The temperature control mechanism comprises a window provided on the inner wall of the other side of the box body (1), a cover plate (9) being arranged in the window, the top outer wall of the other side of the box body (1) being connected to the air inlet pipe (10), and the bottom outer wall of the other side of the box body (1) being connected to the air outlet pipe (11).

4. A flue gas heat exchange device according to claim 3, characterized in that: A filter screen (12) is provided at one end of the air inlet pipe (10), and the filter screen (12) is located inside the box body (1).

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