Multifunctional flue gas flow equalizing device

Abstract

The utility model relates to the technical field of industrial flue gas treatment, in particular to a multifunctional flue gas flow equalizing device which comprises a flow equalizing unit, a dust removal unit and a cooling unit, and the flow equalizing unit comprises a pore plate I, a pore plate II, a flow equalizing pipe, an upper sealing plate, a side sealing plate, a lower sealing plate, a connecting flange, reinforcing ribs and supporting legs; the dust removal unit comprises a dust collection hopper and a dust discharge valve; the cooling unit comprises an air inlet valve, an air inlet cavity, an air exhaust valve and an air exhaust cavity. According to the scheme, the flow equalizing pipe structure with the small air inlet diameter and the large air outlet diameter is adopted, the flow equalizing distribution effect of inlet smoke is improved, the uniform diffusion process of the smoke at the outlet of the device is accelerated, and the uniformity of the flow field of the smoke at the inlet of the fluoroplastic heat exchanger is effectively guaranteed; and the dust in the flue gas is captured, intercepted and collected, and the captured dust is discharged out of the device regularly through the automatic dust discharging system, so that the dust content of the flue gas passing through the device is effectively reduced, and the abrasion risk of the fluoroplastic heat exchange tube is reduced.

Description

Technical Field

[0001] This utility model relates to the field of industrial flue gas treatment technology, and in particular to a multifunctional flue gas flow equalization device. Background Technology

[0002] Tubular fluoroplastic flue gas heat exchangers, as excellent corrosion-resistant flue gas heat exchangers, have been widely used in waste heat recovery from coal-fired flue gas in the past decade. However, due to the weak wear resistance of fluoroplastic material itself, in practical applications, heat exchange tube wear and leakage problems often occur due to flue gas overheating, excessive dust content, and flow field deviation. This seriously affects the operational reliability of the equipment, greatly increases maintenance costs, and significantly reduces energy-saving benefits, thus restricting the market promotion and application of tubular fluoroplastic flue gas heat exchangers.

[0003] Currently, the commonly used flue gas flow equalization devices in the field of industrial flue gas treatment are mainly guide plates or perforated grid plates. According to the actual shape of the flue, the guide plates or perforated grid plates are arranged in different forms to achieve the goal of improving the uniformity of the flue gas flow field, thereby reducing the wear of heat exchange tubes and improving the overall heat exchange capacity of the heat exchanger.

[0004] However, the aforementioned flow guiding device:

[0005] 1. It can only solve the problem of uniformity of flue gas flow field, and has no effect on flue gas overheating or excessive dust content;

[0006] 2. It has poor adaptability to different projects, requires a large amount of design work, high installation accuracy, and is difficult to debug. Utility Model Content

[0007] The purpose of this invention is to address the aforementioned shortcomings in the existing technology by proposing a multifunctional flue gas flow equalization device. Through its unique structural design, it not only effectively achieves a uniform distribution of the flue gas flow field but also enables the regulation of flue gas temperature. Furthermore, it has a certain effect on capturing and removing dust from the flue gas, thus providing effective technical support for the long-term, safe, and efficient operation of fluoroplastic heat exchangers.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: a multifunctional flue gas flow equalization device, comprising a flow equalization unit, a dust removal unit, and a cooling unit, wherein the flow equalization unit comprises an orifice plate one, an orifice plate two, a flow equalization pipe, an upper sealing plate, a side sealing plate, a lower sealing plate, a connecting flange, reinforcing ribs, and support legs;

[0009] The dust removal unit includes a dust collection hopper and a dust discharge valve;

[0010] The cooling unit includes an air inlet valve, an air inlet chamber, an air outlet valve, and an air outlet chamber;

[0011] The upper sealing plate, lower sealing plate, and side sealing plate are welded together in pairs to form the outer shell of the flow equalization unit, and the flue gas inlet and outlet end faces of the outer shell are respectively welded with connecting flanges.

[0012] The outer casing has a flue gas inlet inside, and a second perforated plate is installed on one side of the flue gas inlet. The outer casing also has a flue gas outlet inside, and a first perforated plate is installed on one side of the flue gas outlet. A flow channel for cold air circulation is formed between the outer casing, the first perforated plate, the second perforated plate, and the outer wall of the flow equalization pipe. A side sealing plate is provided on each side of the flow channel. An air inlet is opened below each of the two side sealing plates and is connected to the air inlet cavity.

[0013] The upper part of the flow channel is provided with an upper sealing plate, and an exhaust port is opened in the middle of the upper sealing plate, which is connected to the exhaust cavity.

[0014] A lower sealing plate is provided below the flow channel one, and the upper part of the lower sealing plate is sealed to the lower part of the orifice plate one and the orifice plate two.

[0015] In detail, a flow channel two for flue gas circulation is formed between the orifice plate two, the orifice plate one, the inner wall of the flow equalization pipe and the outer shell. The lower sealing plate in the flow channel two is provided with an ash discharge port adjacent to the orifice plate two, and the ash discharge port is connected to the ash collection hopper.

[0016] In detail, the flow equalization pipe has a horn-shaped structure with a small inlet diameter and a large outlet diameter.

[0017] In detail, several vertical grooves are formed on one side of the perforated plate 2.

[0018] In detail, the ash discharge valve is an automatic ash discharge valve.

[0019] In detail, the air inlet valve is an automatic regulating valve.

[0020] In detail, the lower sealing plate is provided with a ash discharge port, and the ash discharge port is a narrow and elongated structure.

[0021] Innovations of this invention:

[0022] 1. This device has three functions: flue gas flow equalization, dust removal, and cooling.

[0023] 2. This device adopts a gradually expanding flow equalization tube, which integrates the uniform division and uniform diffusion technology of flue gas, resulting in a better flue gas flow field homogenization effect.

[0024] 3. This device adopts a perforated plate surface groove structure design, which achieves a certain dust removal effect;

[0025] 4. This device utilizes the principle of natural air convection heat transfer to achieve the target control of the inlet flue gas temperature of the fluoroplastic heat exchanger.

[0026] The design scheme proposed in this utility model has the following beneficial effects in application:

[0027] 1. This scheme adopts a flow equalization pipe structure with a small inlet diameter and a large outlet diameter, which not only improves the flow equalization distribution effect of the inlet flue gas, but also accelerates the uniform diffusion process of the outlet flue gas, effectively ensuring the uniformity of the flue gas flow field at the inlet of the fluoroplastic heat exchanger.

[0028] 2. As described in 1, the windward face plate adopts a vertical groove structure design, which plays the role of capturing, intercepting and collecting dust in the flue gas. The captured dust is periodically discharged from the device through an automatic dust discharge system, which effectively reduces the dust content of the flue gas passing through the device and reduces the wear risk of fluoroplastic heat exchange tubes.

[0029] 3. As described in 2, through the unique structural design between the flow equalization tube and the shell, the goal of reducing flue gas temperature with zero power consumption is achieved by utilizing the natural ambient air, effectively avoiding the risk of overheating operation of fluoroplastic heat exchangers.

[0030] 4. As described in point 3, the flange connection method is used to connect with the flue, which facilitates the installation, inspection and maintenance of the device. Attached Figure Description

[0031] Figure 1 This is a front view of a multifunctional flue gas equalization device according to the present invention;

[0032] Figure 2 This is a side view of a multifunctional flue gas equalization device according to the present invention;

[0033] Figure 3 This is a bottom view of a multifunctional flue gas equalization device according to the present invention;

[0034] Figure 4 This is an AA view of a multifunctional flue gas equalization device according to the present invention;

[0035] Figure 5 This is a BB view of a multifunctional flue gas equalization device according to the present invention;

[0036] Figure 6 This is a CC view of a multifunctional flue gas equalization device according to the present invention;

[0037] Figure 7 This is a schematic diagram of the overall structure of a multifunctional flue gas equalization device according to the present invention;

[0038] Figure 8 This is a schematic diagram of the arrangement of a multifunctional flue gas equalization device according to the present invention.

[0039] In the diagram: 1. Orifice plate one; 2. Connecting flange; 3. Exhaust valve; 4. Flow equalization pipe; 5. Side sealing plate; 6. Inlet valve; 7. Ash discharge valve; 8. Support leg; 9. Reinforcing rib; 10. Ash collection hopper; 11. Orifice plate two; 12. Upper sealing plate; 13. Lower sealing plate; 14. Exhaust chamber; 15. Inlet chamber. Detailed Implementation

[0040] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0041] Example 1

[0042] Reference Figures 1-8 A multifunctional flue gas flow equalization device includes a flow equalization unit, a dust removal unit and a cooling unit. The flow equalization unit includes an orifice plate 1, an orifice plate 2, a flow equalization pipe 4, an upper sealing plate 12, a side sealing plate 5, a lower sealing plate 13, a connecting flange 2, a reinforcing rib 9 and a support leg 8.

[0043] The dust removal unit includes a dust collection hopper 10 and a dust discharge valve 7;

[0044] The cooling unit includes an air inlet valve 6, an air inlet chamber 15, an air outlet valve 3, and an air outlet chamber 14;

[0045] The upper sealing plate 12, the lower sealing plate 13, and the side sealing plate 5 are welded in pairs to form the outer shell of the flow equalization unit. The flue gas inlet and outlet end faces of the outer shell are respectively welded with connecting flanges 2. The connecting flange 2 at the flue gas outlet end face is connected to the inlet flue flange of the fluoroplastic heat exchanger.

[0046] The outer casing has a flue gas inlet, and a second perforated plate 11 is installed on one side of the flue gas inlet. The outer casing also has a flue gas outlet, and a first perforated plate 1 is installed on one side of the flue gas outlet. A flow channel 1 for cold air circulation is formed between the outer casing, the first perforated plate 1, the second perforated plate 11, and the outer wall of the flow equalization pipe 4. A side sealing plate 5 is installed on each side of the flow channel 1. An air inlet is opened below each of the two side plates 5. The air inlet is connected to the air inlet cavity 15. The air inlet cavity 15 is connected to the outside atmosphere through the air inlet valve 6.

[0047] An upper sealing plate 12 is provided above the flow channel 1. An exhaust port is provided in the middle of the upper sealing plate 12. The exhaust port is connected to the exhaust chamber 14. The exhaust chamber 14 is connected to the atmosphere through the exhaust valve 3.

[0048] A lower sealing plate 13 is provided below the flow channel 1. The upper part of the lower sealing plate 13 is sealed to the lower part of the orifice plate 1 and the orifice plate 2 11 to seal and isolate the air flow area and the flue gas flow area.

[0049] It should be further explained that a flow channel 2 for flue gas circulation is formed between the inner wall of the orifice plate 2 11, the orifice plate 1, the flow equalization pipe 4, and the outer shell. The lower sealing plate 13 located in the flow channel 2 is provided with an ash discharge port adjacent to the orifice plate 2 11. The ash discharge port is connected to the ash collection hopper 10, and the ash collection hopper 10 is connected to the outside through the ash discharge valve 7.

[0050] It should be further noted that the flow equalization pipe 4 is a trumpet-shaped structure with a small inlet diameter and a large outlet diameter. Its advantage is that it is conducive to the flow equalization effect on the inlet side and forms a certain diffusion effect in the flow equalization pipe 4, which is conducive to the uniform distribution of the flue gas flow field after the device.

[0051] It should be further explained that several vertical grooves are opened on one side of the orifice plate 11. The grooves are mainly used to capture dust in the flue gas and guide it to the ash collection hopper 10 at the bottom through the grooves, and finally discharge it through the ash discharge valve 7.

[0052] It should be further noted that the ash discharge valve 7 is an automatic ash discharge valve, model EV-100, which facilitates automatic ash discharge and prevents flue gas from leaking from the dust removal unit into the atmosphere.

[0053] It should be further noted that the air inlet valve 6 is an automatic regulating valve, model PDV-100, which enables online regulation of the flow rate of cold air entering the airflow area, facilitating the control of flue gas temperature.

[0054] It should be further noted that the lower sealing plate 13 is provided with a ash discharge port, and the ash discharge port is a narrow and elongated structure to ensure that all the dust falling from the perforated plate 11 falls into the ash collection hopper 10.

[0055] Example 2

[0056] High-temperature dusty flue gas enters the multi-functional flue gas equalization device through the flue. Under the equalization distribution effect of the orifice plate 11, the high-temperature flue gas is divided into many streams and enters each equalization pipe 4. When the flue gas collides with the surface of the orifice plate 11, the large dust particles that collide with it in the groove are difficult to escape from the groove under the action of wind pressure, and fall down along the groove under the action of gravity. They enter the ash collection hopper 10 through the ash discharge port, and are finally discharged from the device through the ash discharge valve 7, achieving the effect of dust removal. Each stream of flue gas entering the equalization pipe 4 is gradually guided by the structure of the equalization pipe 4 and discharged through the orifice plate 1. The flue gas discharged from the orifice plate 1 has completed a certain degree of diffusion, which accelerates the uniform diffusion process of the subsequent flue gas and fully ensures the uniformity of the flue gas flow field at the inlet of the fluoroplastic heat exchanger.

[0057] When the temperature of the incoming flue gas exceeds the safe operating temperature of the fluoroplastic heat exchanger, the inlet valve 6 and the exhaust valve 3 are opened. The dense cold air enters the outer wall space of the flow equalization pipe 4 through the inlet valve 6. It absorbs the heat of the flue gas through the pipe wall of the flow equalization pipe 4. After the cold air absorbs heat and its temperature rises, its density decreases and it rises. It is then discharged into the atmosphere through the exhaust valve 3. In this way, the cold air achieves the cooling effect on the high-temperature flue gas through natural convection heat exchange, and ultimately achieves the goal of protecting the safe operation of the fluoroplastic heat exchanger.

[0058] In practice

[0059] 1. Flue gas flow equalization process

[0060] High-temperature flue gas enters the outer casing of the device through the connecting flange 2, and first undergoes initial flow equalization through the vertical groove structure of the orifice plate 11.

[0061] The flue gas then enters flow channel two (formed by orifice plate two 11, orifice plate one 1, the inner wall of the flow equalization tube 4, and the outer shell), where secondary flow equalization is achieved under the diffusion effect of the trumpet-shaped flow equalization tube 4. The gradually expanding structure of the flow equalization tube 4 (small inlet, large outlet) can reduce the flue gas velocity, form a uniform flow field, and ensure that the flue gas is evenly distributed and flows to the downstream fluoroplastic heat exchanger.

[0062] 2. Dust removal process

[0063] When flue gas passes through the perforated plate 21, the vertical grooves on its surface can capture dust particles in the flue gas, and the dust will slide down the grooves under the action of gravity.

[0064] The dust eventually falls into the narrow ash discharge port of the lower sealing plate 13 and enters the ash collection hopper 10 for temporary storage. When the ash amount reaches the set value, the electric ash discharge valve 7 automatically opens to discharge the ash from the device, while the sealing structure prevents flue gas leakage.

[0065] 3. Cooling process

[0066] Cold air conditioning: External cold air is regulated by the pneumatic air inlet valve 6 and enters the flow channel one (the interlayer between the outer shell and the outer wall of the flow equalization pipe, and the orifice plate one / two) through the air inlet chamber 15 from the air inlet below the side sealing plate 5.

[0067] Heat exchange: Cold air indirectly exchanges heat with high-temperature flue gas in the flow channel 1 through the uniform flow pipe wall. After absorbing heat from the flue gas, the temperature of the cold air rises, and it finally enters the exhaust chamber 14 through the exhaust port of the upper sealing plate 12, and is discharged to the atmosphere by the exhaust valve 3. This process can effectively reduce the flue gas temperature and protect downstream equipment.

[0068] 4. Collaborative Control

[0069] Temperature control: By adjusting the opening of the air inlet valve 6, the flow rate of cold air is controlled to achieve dynamic balance of flue gas temperature.

[0070] Automated operation: Ash discharge valve 7 automatically opens and closes according to the amount of ash collected, and air inlet valve 6 adjusts in real time according to the flue gas temperature signal to ensure efficient and stable operation of the device.

[0071] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A multifunctional flue gas flow equalization device, comprising a flow equalization unit, a dust removal unit, and a cooling unit, characterized in that: The flow equalization unit includes an orifice plate one (1), an orifice plate two (11), a flow equalization pipe (4), an upper sealing plate (12), a side sealing plate (5), a lower sealing plate (13), a connecting flange (2), a reinforcing rib (9), and a support leg (8); The dust removal unit includes a dust collection hopper (10) and a dust discharge valve (7); The cooling unit includes an air inlet valve (6), an air inlet chamber (15), an air outlet valve (3), and an air outlet chamber (14); The upper sealing plate (12), lower sealing plate (13), and side sealing plate (5) are welded together to form the outer shell of the flow equalization unit, and the flue gas inlet and outlet end faces of the outer shell are respectively welded with connecting flanges (2); The interior of the outer shell is provided with a flue gas inlet, and a second perforated plate (11) is installed on one side of the flue gas inlet. The interior of the outer shell is provided with a flue gas outlet, and a first perforated plate (1) is installed on one side of the flue gas outlet. A flow channel for cold air circulation is formed between the outer shell, the first perforated plate (1), the second perforated plate (11), and the outer wall of the flow equalization pipe (4). A side sealing plate (5) is provided on each side of the flow channel. An air inlet is opened below the two side sealing plates (5), and the air inlet is connected to the air inlet cavity (15). An upper sealing plate (12) is provided above the flow channel 1, and an exhaust port is provided in the middle of the upper sealing plate (12), which is connected to the exhaust cavity (14). A lower sealing plate (13) is provided below the flow channel one, and the upper part of the lower sealing plate (13) is sealed to the lower part of the orifice plate one (1) and the orifice plate two (11).

2. The multifunctional flue gas equalization device according to claim 1, characterized in that: A flow channel 2 for flue gas circulation is formed between the inner wall of the orifice plate 2 (11), the orifice plate 1 (1), the flow equalization pipe (4) and the outer shell. The lower sealing plate (13) in the flow channel 2 is provided with an ash discharge port adjacent to the orifice plate 2 (11), and the ash discharge port is connected to the ash collection hopper (10).

3. The multifunctional flue gas equalization device according to claim 2, characterized in that: The flow equalization pipe (4) has a horn-shaped structure with a small inlet diameter and a large outlet diameter.

4. The multifunctional flue gas equalization device according to claim 3, characterized in that: Several vertical grooves are provided on one side of the perforated plate (11).

5. A multifunctional flue gas equalization device according to claim 4, characterized in that: The ash discharge valve (7) is an automatic ash discharge valve.

6. A multifunctional flue gas equalization device according to claim 5, characterized in that: The air inlet valve (6) is an automatic regulating valve.

7. A multifunctional flue gas equalization device according to claim 6, characterized in that: The lower sealing plate (13) has a ash discharge port, which is a narrow and elongated structure.

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