Flue gas heat utilization and denitration integrated device

Abstract

The utility model relates to the technical field of SCR (Selective Catalytic Reduction) denitration, in particular to a flue gas heat utilization and denitration integrated device which comprises a gas inlet pipeline, the gas inlet pipeline is connected with a gas inlet of a heat exchange device, and a gas outlet of the heat exchange device is connected with a gas inlet of an SCR denitration device through a gas supply pipeline; a plurality of separation blades are arranged in the air inlet pipeline, the two ends of each separation blade are connected with the inner wall of the air inlet pipeline, the two sides of each separation blade and the inner wall of the air inlet pipeline form air passing ports, the separation blades are arranged in a front-back staggered mode, and every two adjacent separation blades are perpendicular to each other; a refrigerant inlet is formed in the bottom of the heat exchange device, a refrigerant outlet is formed in the top of the heat exchange device, a plurality of cooling pipes are arranged in the heat exchange device, and the two ends of each cooling pipe are connected with the refrigerant inlet and the refrigerant outlet respectively. According to the utility model, the flue gas temperature can be effectively adjusted, and the flue gas heat can be recycled.

Description

Technical Field

[0001] The utility model relates to the technical field of SCR denitration, in particular to a flue gas heat utilization and denitration integrated device. Background Art

[0002] Currently, the denitrification equipment available on the market is divided into three types according to the working temperature of the catalyst: high-temperature denitrification, medium-temperature denitrification, and low-temperature denitrification. Among them, the cost of high-temperature denitrification is higher, and the life of low-temperature denitrification is shorter. Medium-temperature denitrification has the highest cost-effectiveness, but the temperature of the flue gas entering the SCR equipment is strictly controlled, generally between 380-420℃, and the exhaust temperature of the internal combustion engine is around 520-550℃, which is much higher than the working temperature of medium-temperature SCR denitrification, resulting in the inability of conventional medium-temperature SCR denitrification to be put into operation. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide an integrated device for flue gas heat utilization and denitrification, which can effectively adjust the flue gas temperature and recycle the flue gas heat.

[0004] The integrated flue gas heat utilization and denitrification device described in the present invention includes an air intake duct, the air intake duct is connected to the air inlet of the heat exchange device, and the air outlet of the heat exchange device is connected to the air inlet of the SCR denitrification device through an air supply duct; a plurality of baffles are provided in the air intake duct, the two ends of the baffles are connected to the inner wall of the air intake duct, and the two sides of the baffles form gas passages with the inner wall of the air intake duct, the baffles are vertically staggered front and back, and two adjacent baffles are perpendicular to each other; a refrigerant inlet is provided at the bottom of the heat exchange device, a refrigerant outlet is provided at the top of the heat exchange device, and a plurality of cooling pipes are provided in the heat exchange device, and the two ends of the cooling pipes are respectively connected to the refrigerant inlet and the refrigerant outlet.

[0005] Preferably, multiple catalyst layers are provided in the SCR denitration device, and a flue gas outlet is provided on the SCR denitration device.

[0006] Preferably, a rectifying grid is provided between the heat exchange device and the air intake pipe, and between the air supply pipe and the SCR denitrification device.

[0007] Preferably, a temperature sensor is provided on the air inlet of the SCR denitrification device. The temperature sensor can be used to monitor the temperature of the gas entering the SCR denitrification device in real time, thereby timely adjusting the refrigerant flow of the heat exchange device to ensure that the flue gas temperature entering the SCR denitrification device is within an appropriate range.

[0008] Preferably, the cross section of the baffle is V-shaped, and the opening direction of the V-shaped structure is consistent with the direction of gas flow. The V-shaped structure is conducive to the passage of gas and is more convenient for cutting the gas flow.

[0009] Preferably, a flow regulating valve is provided on the refrigerant inlet to adjust the temperature of the cooling pipe by adjusting the flow of the refrigerant.

[0010] Preferably, both the air inlet and the air outlet of the heat exchange device are provided with ventilation plates, and the ventilation plates are provided with a plurality of ventilation holes.

[0011] Preferably, a sealing plate is provided at the bottom of the heat exchange device, and the cooling pipe passes through the sealing plate and is connected to the refrigerant inlet.

[0012] Preferably, a bellows for sealing and isolation is provided at the connection between the cooling pipe and the refrigerant inlet.

[0013] Valves can be installed on the pipeline according to control needs, and the flow of materials in the corresponding pipeline can be conveniently controlled and adjusted by opening and closing the valves.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. The flue gas enters the heat exchange device from the air intake pipe. After heat exchange, the temperature drops to the temperature range required by the medium-temperature SCR. The temperature of the flue gas entering the SCR denitrification device can also be adjusted according to the operating load of the internal combustion engine;

[0016] 2. The staggered baffles in the intake duct mix the flue gas, which is beneficial to sufficient heat exchange, and rectify and adjust the flue gas flow field to ensure the stability of the flue gas flow field entering the SCR;

[0017] 3. The refrigerant outlet is connected to the water supply network, and the recovered high-temperature heat can be used for bathing and heating and sent back to the waste heat boiler for secondary use, effectively saving energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of the utility model's flue gas heat utilization and denitrification integrated device;

[0019] Figure 2 This is a schematic diagram of the structure of the internal baffle of the air intake duct of the utility model;

[0020] Figure 3 Schematic diagram of the heat exchange device and ventilation plate structure;

[0021] Figure 4 yes Figure 1 A in the middle is an enlarged structural diagram;

[0022] In the figure: 1. Air intake pipe; 2. Heat exchange device; 3. Air supply pipe; 4. SCR denitrification device; 5. Baffle; 6. Gas passage; 7. Refrigerant inlet; 8. Refrigerant outlet; 9. Flue gas outlet; 10. Bellows; 11. Flow control valve; 12. Vent plate; 13. Vent hole; 14. Sealing plate; 15. Cooling pipe. DETAILED DESCRIPTION

[0023] The present invention will be described clearly and completely below with reference to the accompanying drawings.

[0024] like Figure 1 As shown, the integrated flue gas heat utilization and denitrification device described in the present invention includes an air intake pipe 1, the air intake pipe 1 is connected to the air inlet of the heat exchange device 2, the air outlet of the heat exchange device 2 is connected to the air inlet of the SCR denitrification device 4 through the air supply pipe 3, the SCR denitrification device 4 is provided with multiple catalyst layers, the SCR denitrification device 4 is provided with a flue gas outlet 9, and the air inlet of the SCR denitrification device 4 is provided with a temperature sensor.

[0025] like Figure 2 As shown, a number of baffles 5 are provided in the air intake pipe 1, and the two ends of the baffles 5 are connected to the inner wall of the air intake pipe 1. The two sides of the baffles 5 and the inner wall of the air intake pipe 1 form a gas passage 6. The baffles 5 are vertically staggered front and back, and two adjacent baffles 5 are perpendicular to each other. The cross-section of the baffles 5 is a V-shaped structure, and the opening direction of the V-shaped structure is consistent with the gas flow direction.

[0026] like Figure 1 As shown, a refrigerant inlet 7 is provided at the bottom of the heat exchange device 2, a refrigerant outlet 8 is provided at the top of the heat exchange device 2, a plurality of cooling pipes 15 are provided in the heat exchange device 2, and both ends of the cooling pipes 15 are respectively connected to the refrigerant inlet 7 and the refrigerant outlet 8. A flow regulating valve 11 is provided on the refrigerant inlet 7, and a rectifier grid is provided between the heat exchange device 2 and the air intake pipe 1, as well as between the air supply pipe 3 and the SCR denitrification device 4.

[0027] like Figure 3 As shown, a ventilation plate 12 is provided on the air inlet and the air outlet of the heat exchange device 2 , and a plurality of ventilation holes 13 are provided on the ventilation plate 12 .

[0028] like Figure 4 As shown, a sealing plate 14 is provided at the bottom of the heat exchange device 2, and a cooling pipe 15 passes through the sealing plate 14 and is connected to the refrigerant inlet 7. A bellows 10 is provided at the connection between the cooling pipe 15 and the refrigerant inlet 7 for sealing and isolation.

[0029] The working process is as follows: Flue gas enters from the air intake duct 1, passes through the baffle 5 to be mixed, then passes through the rectifier grid and enters the heat exchanger 2. After being cooled by the cooling pipe 15, it enters the air supply duct 3 from the outlet of the heat exchanger 2, passes through the rectifier grid and enters the SCR denitrification device 4 for denitrification, and is finally discharged from the flue gas outlet 9. The temperature sensor on the air inlet of the SCR denitrification device 4 can monitor in real time whether the temperature of the flue gas entering the SCR denitrification device 4 has reached the operating temperature of the denitrification catalyst. The flow rate of the refrigerant entering the cooling pipe 15 is adjusted by adjusting the flow control valve 11 on the refrigerant inlet 7, thereby adjusting the flue gas temperature.

Claims

1. A flue gas heat utilization and denitrification integrated device, characterized in that: The invention comprises an air intake pipe (1), wherein the air intake pipe (1) is connected to the air intake of a heat exchange device (2), and the air outlet of the heat exchange device (2) is connected to the air intake of an SCR denitration device (4) through an air supply pipe (3); a plurality of baffles (5) are provided in the air intake pipe (1), the two ends of the baffles (5) are connected to the inner wall of the air intake pipe (1), and the two sides of the baffles (5) and the inner wall of the air intake pipe (1) form a gas passage (6); the baffles (5) are vertically staggered in front and back, and two adjacent baffles (5) are perpendicular to each other; a refrigerant inlet (7) is provided at the bottom of the heat exchange device (2), and a refrigerant outlet (8) is provided at the top of the heat exchange device (2); a plurality of cooling pipes (15) are provided in the heat exchange device (2), and the two ends of the cooling pipes (15) are respectively connected to the refrigerant inlet (7) and the refrigerant outlet (8).

2. The integrated flue gas heat utilization and denitrification device according to claim 1, characterized in that: Multiple catalyst layers are provided in the SCR denitration device (4), and a flue gas outlet (9) is provided on the SCR denitration device (4).

3. The integrated flue gas heat utilization and denitrification device according to claim 1, characterized in that: Rectifying grids are provided between the heat exchange device (2) and the air intake pipe (1), and between the air delivery pipe (3) and the SCR denitration device (4).

4. The integrated flue gas heat utilization and denitrification device according to claim 1, characterized in that: A temperature sensor is provided on the air inlet of the SCR denitration device (4).

5. The integrated flue gas heat utilization and denitrification device according to claim 1, characterized in that: The cross section of the baffle (5) is in a V-shaped structure, and the opening direction of the V-shaped structure is consistent with the gas flow direction.

6. The integrated flue gas heat utilization and denitrification device according to claim 1, characterized in that: A flow regulating valve (11) is provided on the refrigerant inlet (7).

7. The integrated flue gas heat utilization and denitrification device according to claim 1, characterized in that: A ventilation plate (12) is provided on the air inlet and the air outlet of the heat exchange device (2), and a plurality of ventilation holes (13) are provided on the ventilation plate (12).

8. The integrated flue gas heat utilization and denitrification device according to claim 1, characterized in that: A sealing plate (14) is provided at the bottom of the heat exchange device (2), and a cooling pipe (15) passes through the sealing plate (14) and is connected to the refrigerant inlet (7).

9. The integrated flue gas heat utilization and denitrification device according to claim 8, characterized in that: A bellows (10) for sealing and isolation is provided at the connection between the cooling pipe (15) and the refrigerant inlet (7).

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