Flue gas desulfurization and denitrification device

Abstract

The utility model relates to a flue gas desulfurization and denitrification device, which belongs to the technical field of waste gas treatment and comprises a desulfurization tower, a denitrification tower, a flue gas outlet, a flue gas inlet, a flue gas inlet pipe, a flue gas conveying pipe, a flue gas outlet pipe, a desulfurization agent spraying device and a denitrification agent spraying device. An annular cooling ring pipe is fixed to the outer side wall of the upper portion of the ammonia water storage tank, a cooling water inlet pipe is arranged at the top of the cooling ring pipe, a plurality of liquid spraying holes spraying towards the outer wall of the ammonia water storage tank are evenly formed in the lower portion of the cooling ring pipe, the outer side of the ammonia water storage tank is sleeved with a cooling jacket, and a drainage pipe is arranged at the bottom of the cooling jacket. When the temperature of the ammonia water storage tank is too high, the valve of the cooling water inlet pipe can be opened, the ammonia water storage tank is cooled, potential safety hazards are reduced, the cooling jacket is arranged, sprayed cooling water can be collected and discharged from the drainage pipe in a centralized mode, and the cooling water is prevented from polluting the surrounding environment.

Description

Technical Field

[0001] The utility model relates to a flue gas desulfurization and denitration device, belonging to the technical field of waste gas treatment. Background Art

[0002] In the process of refractory production, sintering kilns are used. Sintering kilns produce a large amount of flue gas when sintering refractory materials. These flue gases contain a large amount of sulfur oxides and nitrogen oxides. Therefore, desulfurization and denitrification treatment is required before the flue gas is discharged. The current desulfurization and denitrification device includes a desulfurization tower and a denitrification tower connected in sequence, and then a desulfurizer spray device and a denitrification agent spray device are designed in the desulfurization tower and the denitrification tower respectively. The current denitrification agent often uses ammonia water, which is stored in an ammonia water storage tank. In the high temperature in summer, the temperature in the ammonia water storage tank rises, which will cause ammonia gas to accumulate and generate, and the pressure in the ammonia water storage tank increases, which has a high safety hazard of ammonia gas leakage. Utility Model Content

[0003] The utility model provides a flue gas desulfurization and denitrification device to solve the problems in the above-mentioned background technology.

[0004] The utility model relates to a flue gas desulfurization and denitration device, comprising a desulfurization tower and a denitration tower, the tops of the desulfurization tower and the denitration tower are both provided with smoke outlets, the lower side walls of the desulfurization tower and the denitration tower are both provided with smoke inlets, the smoke inlet of the desulfurization tower is connected with a smoke inlet pipe, the smoke outlet of the desulfurization tower and the smoke inlet of the denitration tower are connected with a smoke conveying pipe, the smoke outlet of the denitration tower is connected with a smoke outlet pipe, a desulfurizer spraying device is arranged in the desulfurization tower, a denitration agent spraying device is arranged in the denitration tower, the denitration agent spraying device comprises an ammonia water storage tank and a denitration agent spraying pipe arranged in the denitration tower The other end of the denitrification agent spray pipe is connected to a spray liquid pump 1, and the inlet of the spray liquid pump 1 is connected to the ammonia water storage tank through a pipe 1. An annular cooling ring pipe is fixed on the upper outer wall of the ammonia water storage tank, and a cooling water inlet pipe is arranged on the top of the cooling ring pipe. A plurality of spray holes spraying toward the outer wall of the ammonia water storage tank are evenly arranged on the lower part of the cooling ring pipe. A cooling jacket is arranged on the outer side of the ammonia water storage tank, and the top of the cooling jacket is fixed on the outer side wall of the cooling ring pipe, and the bottom of the cooling jacket is fixed on the bottom outer side wall of the ammonia water storage tank, and a drain pipe is arranged at the bottom of the cooling jacket.

[0005] As a preferred embodiment, a temperature sensor is provided in the ammonia water storage tank, the temperature sensor is connected to a PLC controller, and electric valves connected to the PLC controller are provided on the drain pipe and the cooling water inlet pipe, which can be automatically controlled and more automated.

[0006] As a preferred embodiment, a pressure gauge and an ammonia filling pipe are provided on the top of the ammonia storage tank to facilitate the filling of ammonia.

[0007] As a preferred embodiment, the desulfurizer spraying device includes a desulfurizer spraying pipe arranged in the desulfurization tower, the other end of the desulfurizer spraying pipe is connected to a spray liquid pump 2, the inlet of the spray liquid pump 2 is connected to the desulfurizer storage tank through a pipeline 2, and a desulfurizer filling pipe is provided on the top of the desulfurizer storage tank to facilitate spray desulfurization.

[0008] As a preferred embodiment, pipeline 2 is connected to circulation pipe 2, circulation pipe 2 is provided with filter 2, pipeline 1 is connected to circulation pipe 1, circulation pipe 1 is provided with filter 1, circulation pipe 1, circulation pipe 2, pipeline 1 and pipeline 2 are all provided with valves, so that desulfurization agent and denitrification agent can be circulated and sprayed for use, saving cost and reducing waste.

[0009] As a preferred embodiment, a packing layer 1 is provided below the denitrification agent spray pipe, and a packing layer 2 is provided below the desulfurization agent spray pipe.

[0010] As a preferred embodiment, the lower outer walls of the desulfurization tower and the denitrification tower are provided with observation liquid outlet pipes, the top of which is fixed with a transparent observation tube, the top of which is fixed with an overflow pipe, valves are provided on the observation liquid outlet pipe and the overflow pipe, and the overflow pipe is located below the smoke inlet, which is convenient for observing the liquid level height in the desulfurization tower and the denitrification tower, and observing the dust in the liquid, so as to discharge the turbid liquid in time, and the overflow pipe can prevent the liquid from entering the smoke inlet.

[0011] As a preferred embodiment, a sewage pump is provided at the bottom of the desulfurization tower and the denitrification tower, and a valve is provided on the sewage pump to facilitate sewage discharge.

[0012] The utility model has the following beneficial effects:

[0013] A cooling loop is provided on the outer wall of the ammonia storage tank, and a plurality of spray holes are provided on the cooling loop for spraying toward the outer wall of the ammonia storage tank. The cooling loop is connected to a cooling water inlet pipe. When the temperature of the ammonia storage tank is too high, the valve of the cooling water inlet pipe can be opened to cool the ammonia storage tank and reduce potential safety hazards. In addition, the cooling jacket can collect the sprayed cooling water and discharge it from the drain pipe to prevent the cooling water from polluting the surrounding environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0015] Figure 2 for Figure 1 Partial structure diagram Figure 1 ;

[0016] Figure 3 for Figure 1 Partial structure diagram Figure 2 ;

[0017] In the figure: 1. desulfurization tower; 2. desulfurizer spray pipe; 3. Packing layer two; 4. Circulation pipe two; 5. Desulfurizer storage tank; 6. Spray liquid pump two; 7. Smoke conveying pipe; 8. Smoke outlet pipe; 9. Denitrification tower; 10. Packing layer one; 11. Denitrification agent spray pipe; 12. Circulation pipe one; 13. Spray liquid pump one; 14. Drain pipe; 15. Cooling jacket; 16. Ammonia storage tank; 17. Cooling loop pipe; 18. Cooling water inlet pipe; 19. Ammonia filling pipe; 20. Observation outlet pipe; 21. Overflow pipe; 22. Observation pipe; 23. Sewage extraction pipe. DETAILED DESCRIPTION

[0018] The utility model is further described below in conjunction with embodiments.

[0019] Embodiment 1, as Figures 1 to 3 As shown, the utility model is a flue gas desulfurization and denitration device, including a desulfurization tower 1 and a denitration tower 9, the tops of the desulfurization tower 1 and the denitration tower 9 are both provided with smoke outlets, the lower side walls of the desulfurization tower 1 and the denitration tower 9 are both provided with smoke inlets, the smoke inlet of the desulfurization tower 1 is connected with a smoke inlet pipe, the smoke outlet of the desulfurization tower 1 and the smoke inlet of the denitration tower 9 are connected with a smoke conveying pipe 7, the smoke outlet of the denitration tower 9 is connected with a smoke outlet pipe 8, a desulfurizer spraying device is provided in the desulfurization tower 1, a denitration spraying device is provided in the denitration tower 9, the denitration spraying device includes an ammonia water storage tank 16 and a denitration spraying pipe 11 arranged in the denitration tower 9, and the denitration spraying pipe The other end of 11 is connected to a spray liquid pump 13, and the inlet of the spray liquid pump 13 is connected to an ammonia storage tank 16 through a pipe 1. An annular cooling loop 17 is fixed on the upper outer wall of the ammonia storage tank 16, and a cooling water inlet pipe 18 is provided on the top of the cooling loop 17. A plurality of spray holes spraying toward the outer wall of the ammonia storage tank 16 are evenly provided on the lower part of the cooling loop 17. A cooling jacket 15 is sleeved on the outer side of the ammonia storage tank 16, and the top of the cooling jacket 15 is fixed on the outer wall of the cooling loop 17, and the bottom of the cooling jacket 15 is fixed on the bottom outer wall of the ammonia storage tank 16. A drain pipe 14 is provided at the bottom of the cooling jacket 15.

[0020] During operation, the flue gas enters the lower part of the desulfurization tower 1 from the smoke inlet pipe, and then the flue gas is sprayed by the desulfurizer spraying device during the rising process of the desulfurization tower 1 to perform desulfurization, and then the flue gas enters the denitrification tower 9 from the smoke conveying pipe 7, and then reacts with the ammonia water sprayed by the denitrification agent spraying pipe 11 during the rising process in the denitrification tower 9 to complete the denitrification, and the denitrified flue gas is discharged from the smoke outlet pipe 8. When the temperature is too high in summer, the cooling water inlet pipe 18 can be opened regularly to convey the cooling water into the cooling loop pipe 17, and then sprayed from the spray hole toward the ammonia water storage tank 16 to cool the ammonia water storage tank 16. The cooled cooling water is collected by the cooling jacket 15 and then discharged from the drain pipe 14 to prevent the cooling water from flowing freely.

[0021] Embodiment 2, on the basis of embodiment 1, a temperature sensor is provided in the ammonia water storage tank 16, the temperature sensor is connected to a PLC controller, and an electric valve connected to the PLC controller is provided on the drain pipe 14 and the cooling water inlet pipe 18. The temperature sensor is a PT100 sensor. When the temperature detected by the temperature sensor reaches the set temperature control value, generally 45 degrees Celsius, a signal will be sent to the PLC controller, and the PLC controller will open the electric valves on the drain pipe 14 and the cooling water inlet pipe 18, and then automatically spray water on the ammonia water storage tank 16. When the temperature detected by the temperature sensor reaches the set lower limit, the PLC controller controls the electric valve to close, thereby realizing automatic control cooling of the ammonia water storage tank 16, reducing the accumulation of ammonia caused by high temperature, reducing the pressure in the tank, and preventing ammonia leakage and other safety hazards.

[0022] A pressure gauge and an ammonia filling pipe 19 are provided on the top of the ammonia storage tank 16. Liquid level sensors connected to the PLC controller are provided above and below the inside of the ammonia storage tank 16, and an electric valve connected to the PLC controller is provided on the ammonia filling pipe 19, which can automatically fill ammonia.

[0023] The desulfurizer spraying device comprises a desulfurizer spraying pipe 2 arranged in the desulfurization tower 1, the other end of the desulfurizer spraying pipe 2 is connected to a spraying liquid pump 6, the inlet of the spraying liquid pump 6 is connected to the desulfurizer storage tank 5 through a pipeline 2, and a desulfurizer filling pipe is arranged on the top of the desulfurizer storage tank 5.

[0024] Pipeline 2 is connected with circulation pipe 2 4, on which filter 2 is arranged, and pipeline 1 is connected with circulation pipe 1 12, on which filter 1 is arranged, and valves are arranged on circulation pipe 1 12, circulation pipe 2 4, pipeline 1 and pipeline 2. During the initial spraying treatment, the valves on circulation pipe 1 12 and circulation pipe 2 4 are closed, and the valves on pipeline 1 and pipeline 2 are opened. Spraying liquid pump 2 6 and spraying liquid pump 1 13 will respectively extract the liquid in ammonia water storage tank 16 and desulfurizer storage tank 5 and spray them from desulfurizer spray pipe 11 and desulfurizer spray pipe 2 for desulfurization and denitrification. When the liquid in desulfurization tower 1 and denitrification tower 9 is sufficiently circulated, the valves on circulation pipe 1 12 and circulation pipe 2 4 are opened, and the valves on pipeline 1 and pipeline 2 are closed, and the liquid is circulated and sprayed, and the valves on pipeline 1 and pipeline 2 can be opened regularly to replenish the liquid to prevent the liquid concentration from being too low and affecting the desulfurization and denitrification treatment.

[0025] A packing layer 10 is provided below the denitrification agent spray pipe 11, and a packing layer 2 3 is provided below the desulfurization agent spray pipe 2. A denitrification catalyst is provided in the packing layer 10.

[0026] The lower outer wall of the desulfurization tower 1 and the denitration tower 9 is provided with an observation liquid outlet pipe 20, a transparent observation pipe 22 is fixed on the top of the observation liquid outlet pipe 20, an overflow pipe 21 is fixed on the top of the observation pipe 22, and valves are provided on the observation liquid outlet pipe 20 and the overflow pipe 21, and the overflow pipe 21 is located below the smoke inlet. The inner ends of the two overflow pipes 21 are respectively fixed on the outer walls of the desulfurization tower 1 and the denitration tower 9. The overflow pipe 21 can be opened during cyclic spraying.

[0027] A sewage pumping pipe 23 is provided at the bottom of the desulfurization tower 1 and the denitration tower 9, and a valve is provided on the sewage pumping pipe 23. The sewage pumping pipe 23 is connected to a sewage pump.

[0028] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0029] In the description of the present invention, the terms "inside", "outside", "longitudinal", "lateral", "upper", "lower", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention.

Claims

1. A flue gas desulfurization and denitration device, comprising a desulfurization tower (1) and a denitration tower (9), wherein the tops of the desulfurization tower (1) and the denitration tower (9) are both provided with smoke outlets, the lower side walls of the desulfurization tower (1) and the denitration tower (9) are both provided with smoke inlets, the smoke inlet of the desulfurization tower (1) is connected to a smoke inlet pipe, the smoke outlet of the desulfurization tower (1) and the smoke inlet of the denitration tower (9) are connected to a smoke conveying pipe (7), the smoke outlet of the denitration tower (9) is connected to a smoke outlet pipe (8), a desulfurization agent spraying device is provided in the desulfurization tower (1), and a denitration agent spraying device is provided in the denitration tower (9), wherein: The denitrification agent spraying device comprises an ammonia water storage tank (16) and a denitrification agent spraying pipe (11) arranged in a denitrification tower (9), the other end of the denitrification agent spraying pipe (11) is connected to a spraying liquid pump (13), the inlet of the spraying liquid pump (13) is connected to the ammonia water storage tank (16) through a pipe, an annular cooling ring pipe (17) is fixed on the upper outer wall of the ammonia water storage tank (16), a cooling water inlet pipe (18) is arranged on the top of the cooling ring pipe (17), a plurality of spraying holes for spraying toward the outer wall of the ammonia water storage tank (16) are evenly arranged on the lower part of the cooling ring pipe (17), the outer side of the ammonia water storage tank (16) is covered with a cooling jacket (15), the top of the cooling jacket (15) is fixed on the outer wall of the cooling ring pipe (17), the bottom of the cooling jacket (15) is fixed on the bottom outer wall of the ammonia water storage tank (16), and a drainage pipe (14) is arranged on the bottom of the cooling jacket (15).

2. A flue gas desulfurization and denitrification device according to claim 1, characterized in that: A temperature sensor is provided in the ammonia water storage tank (16), and the temperature sensor is connected to a PLC controller. The drain pipe (14) and the cooling water inlet pipe (18) are both provided with electric valves connected to the PLC controller.

3. A flue gas desulfurization and denitrification device according to claim 2, characterized in that: A pressure gauge and an ammonia filling pipe (19) are provided on the top of the ammonia storage tank (16).

4. A flue gas desulfurization and denitrification device according to claim 1, characterized in that: The desulfurizing agent spraying device comprises a desulfurizing agent spraying pipe (2) arranged in a desulfurizing tower (1), the other end of the desulfurizing agent spraying pipe (2) is connected to a second spraying liquid pump (6), the inlet of the second spraying liquid pump (6) is connected to a desulfurizing agent storage tank (5) through a second pipeline, and a desulfurizing agent filling pipe is arranged on the top of the desulfurizing agent storage tank (5).

5. A flue gas desulfurization and denitrification device according to claim 4, characterized in that: Pipeline 2 is connected to circulation pipe 2 (4), circulation pipe 2 (4) is provided with filter 2, pipeline 1 is connected to circulation pipe 1 (12), circulation pipe 1 (12) is provided with filter 1, and circulation pipe 1 (12), circulation pipe 2 (4), pipeline 1 and pipeline 2 are all provided with valves.

6. A flue gas desulfurization and denitrification device according to claim 4, characterized in that: A packing layer 1 (10) is provided below the denitrification agent spray pipe (11), and a packing layer 2 (3) is provided below the desulfurization agent spray pipe (2).

7. A flue gas desulfurization and denitrification device according to claim 1, characterized in that: An observation liquid outlet pipe (20) is provided on the lower outer side wall of the desulfurization tower (1) and the denitrification tower (9), a transparent observation pipe (22) is fixed on the top of the observation liquid outlet pipe (20), an overflow pipe (21) is fixed on the top of the observation pipe (22), valves are provided on the observation liquid outlet pipe (20) and the overflow pipe (21), and the overflow pipe (21) is located below the smoke inlet.

8. The flue gas desulfurization and denitrification device according to claim 1, characterized in that: A sewage extraction pipe (23) is provided at the bottom of the desulfurization tower (1) and the denitration tower (9), and a valve is provided on the sewage extraction pipe (23).

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