Cement rotary kiln flue gas purification device integrating desulfurization, dust removal and denitrification

Abstract

The invention discloses a cement rotary kiln flue gas purification device integrating desulfurization, dust removal and denitrification, comprising a box body, a reaction tower, an ammonia water mechanism and a desulfurization mechanism are arranged in the box body; a flue gas pipeline connected to the reaction tower is arranged on the box body, the ammonia water mechanism is connected to the flue gas pipeline through an ammonia water atomization injection port, and the desulfurization mechanism is connected to the flue gas pipeline behind the ammonia water atomization injection port through a desulfurizer injection port; a plurality of dust removal and denitrification devices connected to the bottom of the reaction tower are arranged around the reaction tower, a flue gas outlet pipe connected to a chimney is arranged at the top of the dust removal and denitrification device, and a main fan is arranged on the flue gas outlet pipe. The invention arranges flue gas desulfurization, dust removal and denitrification operation equipment in a box body, and completes desulfurization, dust removal and denitrification operations by arranging a multi-stage technical structure in the box body, and has the characteristics of simple structure, small equipment footprint, etc., and also reduces equipment investment, energy consumption and operation cost of equipment operation.

Description

Technical Field

[0001] The invention relates to the technical field of flue gas treatment, in particular to a cement rotary kiln flue gas purification device integrating desulfurization, dust removal and denitrification. Background Art

[0002] The kiln will produce a lot of flue gas during the combustion process, which contains a lot of dust, SO2, NO X Furnace flue gas desulfurization, dust removal and denitrification refer to the removal of SO2, dust, NO X .

[0003] At present, dust, SO2, NO in flue gas at home and abroad X Purification technology is divided into three systems, namely dust removal system, desulfurization system and denitrification system. In the process of flue gas treatment, structural parts and pipelines are needed to connect these three systems together. Moreover, the resistance of such structural parts connection is relatively large. The three systems are connected separately, which not only occupies a large area, but also has a relatively high equipment investment cost. The energy consumption of equipment operation increases, resulting in increased operating costs. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a cement rotary kiln flue gas purification device integrating desulfurization, dust removal and denitrification, which can reduce the equipment footprint, reduce equipment investment, and reduce energy consumption and operating costs.

[0005] In order to solve the above technical problems, the technical solutions adopted by the present invention are as follows.

[0006] A cement rotary kiln flue gas purification device integrating desulfurization, dust removal and denitrification comprises a box body, in which a reaction tower for treating flue gas, an ammonia water mechanism for denitrifying flue gas and a desulfurization mechanism for desulfurizing flue gas are arranged; a flue gas pipeline connected to the reaction tower and used for accessing flue gas is arranged on the box body, the ammonia water mechanism is connected to the flue gas pipeline through an ammonia water atomizing injection port, and the desulfurization mechanism is connected to the flue gas pipeline behind the ammonia water atomizing injection port through a desulfurizer injection port; a plurality of dust removal and denitrification devices connected to the bottom end of the reaction tower and used for dust removal, filtration and denitrification of flue gas are arranged around the reaction tower, a flue gas outlet pipe connected to a chimney is arranged on the top of the dust removal and denitrification device, and a main fan for discharging purified flue gas is arranged on the flue gas outlet pipe.

[0007] The above-mentioned cement rotary kiln flue gas purification device integrating desulfurization, dust removal and denitrification, the dust removal and denitrification device is a cylindrical structure, including a filter layer arranged on the outer layer for filtering the flue gas and a catalytic layer arranged on the inner layer for catalyzing the denitrification of the flue gas, and the center of the dust removal and denitrification device is an outlet connected to the flue gas outlet pipe.

[0008] The above-mentioned cement rotary kiln flue gas purification device integrating desulfurization, dust removal and denitrification has a denitrification catalyst for denitrifying the flue gas arranged in the catalytic layer.

[0009] The above-mentioned cement rotary kiln flue gas purification device integrating desulfurization, dust removal and denitrification has a pulse soot blower for removing dust in the filter layer at the top of the dust removal and denitrification device, and an ash hopper for collecting dust in the flue gas at the bottom of the dust removal and denitrification device.

[0010] In the cement rotary kiln flue gas purification device integrating desulfurization, dust removal and denitrification, a lifting valve for opening and closing a channel connected to the flue gas outlet pipe is arranged at the top of the dust removal and denitrification device (10).

[0011] The above-mentioned cement rotary kiln flue gas purification device integrating desulfurization, dust removal and denitrification, the desulfurization mechanism includes a desulfurizer reservoir for storing desulfurizer and a circulating ash reservoir connected to the ash hopper through a pipeline for storing circulating ash with active ingredients, the bottom ends of the desulfurizer reservoir and the circulating ash reservoir are connected to the desulfurizer injection port through a desulfurizer pipeline, and the desulfurizer pipeline is provided with a second Roots blower for delivering the desulfurizer into the desulfurizer pipeline.

[0012] The above-mentioned cement rotary kiln flue gas purification device integrating desulfurization, dust removal and denitrification, the pipeline between the circulating ash bin and the ash hopper is provided with a first Roots blower for conveying the circulating ash into the circulating ash bin.

[0013] The above-mentioned cement rotary kiln flue gas purification device integrating desulfurization, dust removal and denitrification, the desulfurizer is sodium bicarbonate and calcium hydroxide.

[0014] The above-mentioned cement rotary kiln flue gas purification device integrating desulfurization, dust removal and denitrification, wherein the ammonia water mechanism is provided with ammonia water with an ammonia ratio of 20%.

[0015] Due to the adoption of the above technical scheme, the technical progress achieved by the present invention is as follows.

[0016] The present invention arranges the flue gas desulfurization, dust removal and denitrification equipment in a box, and completes the desulfurization, dust removal and denitrification operations by arranging a multi-stage technical structure in the box. It has the characteristics of simple structure and small equipment footprint, while also reducing equipment investment, energy consumption and operating costs of equipment operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention;

[0018] Figure 2 It is a structural schematic diagram of the dust removal and denitrification device of the present invention;

[0019] Figure 3 It is a working principle diagram of the present invention;

[0020] Among them: 1. Flue gas duct, 2. Ammonia atomizing nozzle, 3. Ammonia mechanism, 4. Desulfurizer nozzle, 5. Flue gas deflector, 6. Reaction tower, 7. Flue gas outlet pipe, 8. Lifting valve, 9. Pulse injector, 10. Dust removal and denitrification device, 11. Ash hopper, 12. First Roots blower, 13. Circulating ash storage, 14. Desulfurizer storage, 15. Second Roots blower, 16. Main fan, 17. Chimney, 18. Box, 19. Filter layer, 20. Catalytic layer, 21. Air outlet. DETAILED DESCRIPTION

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] The cement rotary kiln flue gas purification device integrates desulfurization, dust removal and denitrification. Its structure is as follows: Figure 1-2 As shown, it includes a box body 18, in which a reaction tower 6, an ammonia water mechanism 3, a desulfurization mechanism and a dust removal and denitrification device 10 are arranged. The reaction tower 6 is used to treat the flue gas, the ammonia water mechanism 3 is used to denitrify the flue gas, the desulfurization mechanism is used to desulfurize the flue gas, and the dust removal and denitrification device 10 is used to remove dust, filter and denitrify the flue gas.

[0023] A flue gas duct 1 is provided on the box body 1, and the flue gas duct 1 is connected to the reaction tower 6 for connecting the reaction tower 6 to the flue gas. The ammonia mechanism 3 is connected to the flue gas duct 1 through the ammonia atomizing injection port 2. The desulfurization mechanism is connected to the flue gas duct 1 behind the ammonia atomizing injection port 2 through the desulfurizer injection port 4. A plurality of dust removal and denitrification devices 10 are provided, which are respectively arranged around the reaction tower 6. The top of the dust removal and denitrification device 10 is connected to the chimney 17 through the flue gas outlet pipe 7. The flue gas outlet pipe 7 is provided with a main fan 16 for discharging the purified flue gas.

[0024] The denitrification dust collector 10 is configured as a cylindrical structure, including a filter layer 19 and a catalytic layer 20. The filter layer 19 is configured as an outer layer for filtering the flue gas and removing dust in the flue gas. The catalytic layer 20 is configured as an inner layer for catalyzing the denitrification of the flue gas. The center of the denitrification dust collector 10 is configured as an air outlet 21, which is connected to the flue gas outlet pipe 7 to discharge the purified flue gas.

[0025] A denitration catalyst is arranged in the catalytic layer 20 to catalyze the denitration of flue gas. The catalyst is generally composed of tungsten, vanadium, and titanium metal elements, and ammonia water is used as a reactant, which is reduced to nitrogen N2 and water H2O after catalytic reaction.

[0026] The dust removal and denitrification device 10 is connected to the bottom end of the reaction tower 6. After the flue gas enters the dust removal and denitrification device, the dust in the flue gas is first filtered through the filter layer, and then the flue gas passes through the catalytic layer for denitrification.

[0027] The ammonia water mechanism 3 is arranged on the flue gas pipeline 1 through the ammonia water atomizing injection port 2. Ammonia water is arranged in the ammonia water mechanism 3. The proportion of ammonia water is 20%. The ammonia water in the ammonia water mechanism 3 is sprayed into the flue gas pipeline 1 through the ammonia water atomizing injection port 2, and enters the reaction tower 6 through the flue gas pipeline to react with NO in the reaction tower. X Since the dust removal and denitrification device 10 is provided with a denitration catalyst, the flue gas is denitrated. After the flue gas containing ammonia water enters the dust removal and denitrification device 10, NO is removed under the catalytic action of the denitration catalyst. X , remove NO X The purified flue gas is introduced into the chimney 17 by the main fan 16 and discharged.

[0028] A smoke deflector 5 is provided at the top of the reaction tower 6 for guiding the smoke so that the smoke enters the reaction tower 6 evenly.

[0029] The dust collector and denitrifier 10 is provided with a pulse soot blower 9 for removing dust from the filter layer 19. The bottom of the dust collector and denitrifier 10 is provided with an ash hopper 11 for collecting dust in the flue gas. The top of the dust collector and denitrifier 10 is provided with a lift valve 8 for opening and closing the connection channel with the flue gas outlet pipe 7. When the dust in the dust collector and denitrifier 10 accumulates a lot and the resistance is large, the lift valve 8 is closed, and the pulse soot blower 9 performs pulse online cleaning on the filter layer 19 in the dust collector and denitrifier 10, and the cleaned dust falls into the ash hopper 11 at the bottom.

[0030] The desulfurization mechanism includes a desulfurizer reservoir 14 and a circulating ash reservoir 13. The desulfurizer reservoir 14 is used to store desulfurizers, and the circulating ash reservoir 13 is used to store circulating ash with active ingredients. The bottom ends of the desulfurizer reservoir 14 and the circulating ash reservoir 13 are connected to the desulfurizer injection port 4 through a desulfurizer pipeline to inject desulfurizer into the flue gas pipeline 1. A second Roots blower 15 is provided on the desulfurizer pipeline to deliver the desulfurizer into the desulfurizer pipeline and spray the desulfurizer out through the desulfurizer injection port 4.

[0031] The desulfurizer reservoir 14 stores a desulfurizer, and the desulfurizer is sodium bicarbonate or calcium hydroxide.

[0032] The circulating ash bin 13 is connected to the ash hopper 11 via a pipeline, and a first Roots blower 12 is provided on the pipeline to send the circulating ash in the ash hopper into the circulating ash bin 13 for recycling.

[0033] The desulfurizer in the desulfurizer bin and the circulating ash bin enters the reaction tower from the top of the reaction tower through the second Roots blower via the desulfurizer injection port for desulfurization reaction. The circulating ash with active ingredients falling into the ash hopper is transported to the circulating ash bin through the first Roots blower for recycling, thus avoiding waste of desulfurizer.

[0034] The desulfurizing agent and dust in the flue gas after desulfurization are filtered through the dust removal and denitrification device 10 installed around the reaction tower 6. The flue gas is denitrated again during filtration. The increased denitration efficiency of the flue gas after the second denitration can reach more than 95%.

[0035] The working principle diagram of the present invention is as follows Figure 3 As shown in the figure, when the flue gas is treated, after the flue gas passes through the flue gas pipeline, the ammonia water mechanism and the desulfurizer injection port respectively spray ammonia water and desulfurizer into the flue gas in the flue gas pipeline, and the flue gas containing ammonia water and desulfurizer enters the reaction tower for reaction. The desulfurizer reacts with SO2 in the flue gas in the reaction tower to desulfurize the flue gas, and the ammonia water reacts with NO in the flue gas in the reaction tower. X The reaction is used for denitrification. The flue gas after desulfurization and denitrification enters the dust removal and denitrification device for flue gas filtration. At the same time, the dust is denitrified again to increase the denitrification efficiency. After the flue gas passes through the dust removal and denitrification device for dust removal and denitrification, it is introduced into the chimney by the main fan and discharged into the atmosphere.

Claims

1. A cement rotary kiln flue gas purification device integrating desulfurization, dust removal and denitrification, characterized by: The invention comprises a box (18), wherein a reaction tower (6) for treating flue gas, an ammonia water mechanism (3) for denitrifying the flue gas, and a desulfurization mechanism for desulfurizing the flue gas are arranged in the box (18); a flue gas pipeline (1) connected to the reaction tower (6) and used for receiving the flue gas is arranged on the box (18); the ammonia water mechanism (3) is connected to the flue gas pipeline (1) through an ammonia water atomizing injection port (2); the desulfurization mechanism is connected to the flue gas pipeline (1) behind the ammonia water atomizing injection port (2) through a desulfurizer injection port (4); a plurality of dust removal and denitrification devices (10) connected to the bottom end of the reaction tower and used for dust removal, filtration and denitrification of the flue gas are arranged around the reaction tower (6); a flue gas outlet pipe (7) connected to a chimney (17) is arranged at the top of the dust removal and denitrification device (10); and a main fan (16) for discharging the purified flue gas is arranged on the flue gas outlet pipe (7).

2. The cement rotary kiln flue gas purification device integrating desulfurization, dust removal and denitrification according to claim 1 is characterized in that: The dust removal and denitrification device (10) is a cylindrical structure, comprising a filter layer (19) arranged on an outer layer for filtering flue gas and a catalytic layer (20) arranged on an inner layer for catalyzing denitrification of flue gas, and the center of the dust removal and denitrification device (10) is an outlet (21) connected to a flue gas outlet pipe (7).

3. The cement rotary kiln flue gas purification device integrating desulfurization, dust removal and denitrification according to claim 2 is characterized in that: A denitration catalyst for denitrifying flue gas is arranged in the catalytic layer (20).

4. The cement rotary kiln flue gas purification device integrating desulfurization, dust removal and denitrification according to claim 2 is characterized in that: A pulse soot blower (9) for removing dust from the filter layer (19) is provided at the top end of the dust removal and denitrification device (10), and an ash hopper (11) for collecting dust in the flue gas is provided at the bottom end of the dust removal and denitrification device (10).

5. The cement rotary kiln flue gas purification device integrating desulfurization, dust removal and denitrification according to claim 2 is characterized in that: A lifting valve (8) for opening and closing a channel connected to the flue gas outlet pipe (7) is provided at the top of the dust removal and denitrification device (10).

6. The cement rotary kiln flue gas purification device integrating desulfurization, dust removal and denitrification according to claim 4 is characterized in that: The desulfurization mechanism comprises a desulfurization agent reservoir (14) for storing desulfurization agent and a circulating ash reservoir (13) connected to an ash hopper (11) via a pipeline for storing circulating ash containing active components. The bottom ends of the desulfurization agent reservoir (14) and the circulating ash reservoir (13) are connected to a desulfurization agent injection port (4) via a desulfurization agent pipeline. The desulfurization agent pipeline is provided with a second Roots blower (15) for delivering the desulfurization agent into the desulfurization agent pipeline.

7. The cement rotary kiln flue gas purification device integrating desulfurization, dust removal and denitrification according to claim 6 is characterized in that: A first Roots blower (12) for conveying circulating ash into the circulating ash bin is arranged on the pipeline between the circulating ash bin (13) and the ash hopper (11).

8. The cement rotary kiln flue gas purification device integrating desulfurization, dust removal and denitrification according to claim 6 is characterized in that: The desulfurizing agent is sodium bicarbonate or calcium hydroxide.

9. The cement rotary kiln flue gas purification device integrating desulfurization, dust removal and denitrification according to claim 1 is characterized in that: The ammonia water mechanism (3) is provided with ammonia water having an ammonia ratio of 20%.

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