Device for removing CO and NOx in sintering flue gas based on heat circulation

Abstract

The utility model relates to the field of waste gas treatment, and discloses a device for removing CO and NOx in sintering flue gas based on heat circulation, which comprises a treatment bin, the output end of one side of the bottom of the treatment bin is fixedly connected with a flue inlet channel, and the output end of one side, far away from the flue inlet channel, of the treatment bin is fixedly connected with a flue outlet channel. The sintering flue gas treatment device is compact and reasonable in structural design, CO and NOx in sintering flue gas are effectively removed through a series of physical and chemical processes, meanwhile, cyclic utilization of heat is achieved, the overall treatment efficiency and environmental protection benefits are improved, and the sintering flue gas treatment device is suitable for industrial production. The problems that a device for removing CO and NOx in sintering flue gas based on heat circulation is high in operation cost and poor in pollutant removal effect are solved.

Description

Technical Field

[0001] The utility model relates to the field of waste gas treatment, specifically a method for treating CO and NO in sintering flue gas based on heat circulation x Remove the device. Background Art

[0002] Sintering flue gas is an important waste gas generated in the steel production process, which contains a large amount of CO and NO x The presence of these pollutants not only causes serious environmental pollution, but also leads to energy waste. Specifically, the CO concentration in sintering flue gas is relatively high, usually reaching 1% to 2% (about 8000 to 20000 mg / m 3 ), and the energy it carries accounts for about 15% to 20% of the total energy consumed in sintering. x As another major pollutant, its emission concentration also needs to be strictly controlled to meet environmental protection standards.

[0003] The sintering flue gas in the steel industry contains a large amount of combustible CO, and its concentration is generally 6000-12000mg / Nm 3 , its emissions account for about 70% of steel plants, and the sintering flue gas contains 16% oxygen. If the relevant technology can be used to realize the combustion of CO in the flue gas and the recovery of CO resources in the flue gas, it will produce great economic and social environmental benefits. For this reason, we proposed a method for the recovery of CO and NO in sintering flue gas based on heat cycle. x Remove the device. Utility Model Content

[0004] 1. Technical issues to be resolved

[0005] Aiming at the shortcomings of the prior art, the utility model provides a method for removing CO and NO in sintering flue gas based on heat cycle. x Removing the device solves the above problems.

[0006] (II) Technical solution

[0007] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions: a method for removing CO and NO in sintering flue gas based on heat circulation xThe removal device comprises a treatment chamber, wherein an output end on one side of the bottom of the treatment chamber is fixedly connected to a smoke inlet, an output end on a side of the treatment chamber away from the smoke inlet is fixedly connected to a smoke outlet, an outer wall of the treatment chamber near the smoke inlet is fixedly connected to an injection device, an inner wall of the treatment chamber near the smoke inlet is fixedly connected to a sensor, an inner wall of one side of the treatment chamber is fixedly connected to a GGH heat exchanger, and the GGH heat exchanger is located above the sensor, an output end on one side of the GGH heat exchanger passes through the inner wall of the treatment chamber near the smoke outlet, a plasma ignition device is fixedly connected to the outer wall of one end of the treatment chamber, and an output end of one end of the plasma ignition device passes through the inner wall of one end of the treatment chamber, and the plasma The sub-ignition device is located above the output end on one side of the GGH heat exchanger, an oxygen injection device is fixedly connected to the outer wall of one end of the treatment chamber close to the plasma ignition device, and the oxygen injection device is located above the plasma ignition device, the injection device includes a control box, a control computer, an ammonia shunt pipeline, and an ammonia spray head, a control box is fixedly connected to the outer wall of one end of the treatment chamber, the control box is fixedly connected to the outer wall of one end away from the treatment chamber, the ammonia shunt pipeline is fixedly connected to the output end of the top of the control box, and the output end of the ammonia shunt pipeline away from the control box runs through one end of the inner wall of the treatment chamber, and the output end of the ammonia shunt pipeline away from the control box is fixedly connected to the ammonia spray head.

[0008] Preferably, the jet device is located above the oxygen jet device.

[0009] Preferably, a second sensor is fixedly connected to the inner wall of the treatment chamber on a side away from the sensor, and the second sensor is located above the jet device.

[0010] Preferably, a wind collecting plate is fixedly connected to the top of the inner wall of the treatment chamber, a second wind collecting plate is fixedly connected to the top of the inner wall of the treatment chamber close to the wind collecting plate, a third sensor is fixedly connected to the inner wall of the treatment chamber away from the second sensor, and the second sensor, wind collecting plate, second wind collecting plate and third sensor are parallel.

[0011] Preferably, a denitration catalyst is fixedly connected to the inner wall of the treatment chamber near the third sensor, a CO low-temperature combustion catalyst is fixedly connected to the inner wall of the treatment chamber near the denitration catalyst, and the denitration catalyst is located above the CO low-temperature combustion catalyst, and a fourth sensor is fixedly connected to the inner wall of the treatment chamber near the CO low-temperature combustion catalyst, and the fourth sensor is located above the top output end of the flue gas outlet.

[0012] (III) Beneficial effects

[0013] Compared with the prior art, the utility model provides a method for reducing CO and NO in sintering flue gas based on heat circulation. x The removal device has the following beneficial effects:

[0014] 1. CO and NO in sintering flue gas based on heat cycle x Removal device, through the chemical reaction or catalytic process in the treatment chamber, the device can effectively remove CO and NO in the sintering flue gas x , reduce the emission concentration of these pollutants and meet environmental protection standards.

[0015] 2. CO and NO in sintering flue gas based on heat cycle x Removal device, a large amount of heat released during CO oxidation can be recovered and used to preheat sintering flue gas or other process, thus improving energy utilization efficiency.

[0016] 3. CO and NO in sintering flue gas based on heat cycle x By removing the device and using technical means such as heat recovery and self-heating maintenance, the device can significantly reduce energy consumption during operation, thereby reducing operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the utility model;

[0018] Figure 2 It is a cross-sectional schematic diagram of the utility model;

[0019] Figure 3 This is a cross-sectional schematic diagram of the reverse side of the utility model;

[0020] Figure 4 It is a schematic diagram of the jet device of the utility model.

[0021] In the figure: 1. Treatment chamber; 2. Smoke inlet; 3. Smoke outlet; 4. Injection device; 5. Sensor; 6. GGH heat exchanger; 7. Plasma ignition device; 8. Oxygen injection device; 9. Second sensor; 10. Wind gathering plate; 11. Second wind gathering plate; 12. Third sensor; 13. Denitrification catalyst; 14. CO low-temperature combustion catalyst; 15. Fourth sensor; 16. Control box; 17. Control computer; 18. Ammonia diversion pipeline; 19. Ammonia spray head. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in 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.

[0023] See also Figure 1-4 , a method for the determination of CO and NO in sintering flue gas based on heat cycle xThe removal device comprises a treatment chamber 1, wherein an output end on one side of the bottom of the treatment chamber 1 is fixedly connected to a smoke inlet 2, an output end on the side of the treatment chamber 1 away from the smoke inlet 2 is fixedly connected to a smoke outlet 3, an outer wall of the treatment chamber 1 close to the smoke inlet 2 is fixedly connected to an injection device 4, an inner wall of the treatment chamber 1 close to the smoke inlet 2 is fixedly connected to a sensor 5, an inner wall of one side of the treatment chamber 1 is fixedly connected to a GGH heat exchanger 6, and the GGH heat exchanger 6 is located above the sensor 5, an output end on one side of the GGH heat exchanger 6 passes through the inner wall of the treatment chamber 1 close to the smoke outlet 3, a plasma ignition device 7 is fixedly connected to the outer wall of one end of the treatment chamber 1, and an output end of the plasma ignition device 7 passes through the inner wall of one end of the treatment chamber 1, and the plasma ignition device 7 is located at the GG Above the output end on one side of the H heat exchanger 6, an oxygen injection device 8 is fixedly connected to the outer wall of one end of the treatment chamber 1 close to the plasma ignition device 7, and the oxygen injection device 8 is located above the plasma ignition device 7. The injection device 4 includes a control box 16, a control computer 17, an ammonia diversion pipeline 18, and an ammonia spray head 19. The outer wall of one end of the treatment chamber 1 is fixedly connected to the control box 16, and the outer wall of the control box 16 away from the control computer 17 is fixedly connected, the top output end of the control box 16 is fixedly connected to the ammonia diversion pipeline 18, and the output end of the ammonia diversion pipeline 18 away from the control box 16 runs through one end of the inner wall of the treatment chamber 1, and the output end of the ammonia diversion pipeline 18 away from the control box 16 is fixedly connected to the ammonia spray head 19.

[0024] Furthermore, the injection device 4 is located above the oxygen injection device 8 .

[0025] Furthermore, a second sensor 9 is fixedly connected to the inner wall of the treatment chamber 1 on the side away from the sensor 5 , and the second sensor 9 is located above the jet device 4 .

[0026] Furthermore, a wind collecting plate 10 is fixedly connected to the top of the inner wall of the treatment chamber 1, a second wind collecting plate 11 is fixedly connected to the top of the inner wall of the treatment chamber 1 close to the wind collecting plate 10, and a third sensor 12 is fixedly connected to the inner wall of the treatment chamber 1 away from the second sensor 9. The second sensor 9, the wind collecting plate 10, the second wind collecting plate 11, and the third sensor 12 are parallel.

[0027] Furthermore, a denitration catalyst 13 is fixedly connected to the inner wall of the treatment chamber 1 near the third sensor 12, a CO low-temperature combustion catalyst 14 is fixedly connected to the inner wall of the treatment chamber 1 near the denitration catalyst 13, and the denitration catalyst 13 is located above the CO low-temperature combustion catalyst 14, and a fourth sensor 15 is fixedly connected to the inner wall of the treatment chamber 1 near the CO low-temperature combustion catalyst 14, and the fourth sensor 15 is located above the top output end of the flue 3.

[0028] Working principle: First, the flue gas generated by sintering enters the treatment chamber 1 through the flue duct 2. The sensor 5 is located on the side of the treatment chamber 1 close to the flue duct 2 to monitor the CO and NO in the flue gas entering the treatment chamber.x The flue gas continues to flow in the treatment chamber 1 and passes through the GGH heat exchanger 6 (flue gas-flue gas heat exchanger). The heat of the high-temperature flue gas is used to preheat the low-temperature flue gas that subsequently enters the treatment chamber, thereby realizing the recycling of heat and improving the efficiency of the subsequent treatment process. The injection device 4 controls the ammonia shunt pipeline 18 through the control computer 17 to inject ammonia (NH3) into the treatment chamber, and the ammonia injection head 19 is uniformly injected to provide a reducing agent for the subsequent SCR (selective catalytic reduction) denitrification reaction. The plasma ignition device 7 is used to ignite the combustible substances in the flue gas when necessary, especially to promote the combustion of CO, and may also promote the combustion of NO x The oxygen injection device 8 supplements oxygen during the ignition or combustion process to ensure that the combustion reaction is fully carried out, especially to promote the complete combustion of CO. The injection of oxygen and ammonia, as well as the plasma ignition, promotes the combustion reaction of CO in the flue gas and converts it into harmless carbon dioxide (CO2). Ammonia and NO in the flue gas are x Under the action of the denitration catalyst 13, an SCR reaction occurs to convert NO x Converted into nitrogen (N2) and water (H2O) to achieve NO x After denitration, the flue gas continues to flow to the CO low-temperature combustion catalyst 14, which promotes the complete combustion of the remaining CO at a lower temperature, further reducing the CO content in the flue gas. The second sensor 9, the third sensor 12 and the fourth sensor 15 are respectively located at different positions in the treatment chamber, and are used to monitor the CO and NO in the flue gas during the treatment process and before emission. x The concentration is reduced to ensure that the emission meets the standard. The treated flue gas is discharged into the atmosphere through the flue duct 3. During the whole treatment process, the GGH heat exchanger 6 works continuously to recover the heat of the high-temperature flue gas to preheat the low-temperature flue gas, forming a heat cycle and improving energy efficiency.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for the determination of CO and NO in sintering flue gas based on heat cycle x The removal device comprises a treatment chamber (1), characterized in that: The output end of one side of the bottom of the treatment chamber (1) is fixedly connected to a smoke inlet (2), the output end of the side of the treatment chamber (1) away from the smoke inlet (2) is fixedly connected to a smoke outlet (3), the outer wall of the treatment chamber (1) close to the smoke inlet (2) is fixedly connected to an injection device (4), the inner wall of the treatment chamber (1) close to the smoke inlet (2) is fixedly connected to a sensor (5), the inner wall of one side of the treatment chamber (1) is fixedly connected to a GGH heat exchanger (6), and the GGH heat exchanger (6) is located above the sensor (5), the output end of one side of the GGH heat exchanger (6) passes through the inner wall of the treatment chamber (1) close to the smoke outlet (3), the outer wall of one end of the treatment chamber (1) is fixedly connected to a plasma ignition device (7), and the output end of one end of the plasma ignition device (7) passes through the inner wall of one end of the treatment chamber (1), and the plasma ignition device (7) is located at the GGH heat exchanger ( 6) above the output end on one side, an oxygen injection device (8) is fixedly connected to the outer wall of one end of the treatment chamber (1) close to the plasma ignition device (7), and the oxygen injection device (8) is located above the plasma ignition device (7), the injection device (4) comprises a control box (16), a control computer (17), an ammonia shunt pipeline (18), and an ammonia spray head (19), the outer wall of one end of the treatment chamber (1) is fixedly connected to the control box (16), the outer wall of one end of the control box (16) away from the treatment chamber (1) is fixedly connected to the control computer (17), the top output end of the control box (16) is fixedly connected to the ammonia shunt pipeline (18), and the output end of the ammonia shunt pipeline (18) away from the control box (16) passes through one end of the inner wall of the treatment chamber (1), and the output end of the ammonia shunt pipeline (18) away from the control box (16) is fixedly connected to the ammonia spray head (19).

2. A method for removing CO and NO from sintering flue gas based on heat cycle according to claim 1 x The removal device is characterized in that: The injection device (4) is located above the oxygen injection device (8).

3. A method for removing CO and NO from sintering flue gas based on heat cycle according to claim 1 x The removal device is characterized in that: A second sensor (9) is fixedly connected to the inner wall of the treatment chamber (1) on the side away from the sensor (5), and the second sensor (9) is located above the jetting device (4).

4. A method for removing CO and NO from sintering flue gas based on heat cycle according to claim 1 x The removal device is characterized in that: A wind collecting plate (10) is fixedly connected to the top of the inner wall of the treatment chamber (1); a second wind collecting plate (11) is fixedly connected to the top of the inner wall of the treatment chamber (1) on the side close to the wind collecting plate (10); a third sensor (12) is fixedly connected to the inner wall of the treatment chamber (1) on the side away from the second sensor (9); and the second sensor (9), the wind collecting plate (10), the second wind collecting plate (11), and the third sensor (12) are parallel.

5. A method for removing CO and NO from sintering flue gas based on heat cycle according to claim 1 x The removal device is characterized in that: A denitration catalyst (13) is fixedly connected to the inner wall of the treatment chamber (1) on the side close to the third sensor (12); a CO low-temperature combustion catalyst (14) is fixedly connected to the inner wall of the treatment chamber (1) on the side close to the denitration catalyst (13); and the denitration catalyst (13) is located above the CO low-temperature combustion catalyst (14); a fourth sensor (15) is fixedly connected to the inner wall of the treatment chamber (1) on the side close to the CO low-temperature combustion catalyst (14); and the fourth sensor (15) is located above the top output end of the flue gas outlet (3).

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