CN216457980U - Cement rotary kiln flue gas purification device integrating desulfurization, dust removal and denitration - Google Patents

Abstract

The utility model discloses a cement rotary kiln flue gas purification device integrating desulfurization, dust removal and denitrification. In the flue gas pipeline of the tower, the ammonia water mechanism is connected to the flue gas pipeline through the ammonia water atomization injection port, and the desulfurization mechanism is connected to the flue gas pipeline behind the ammonia water atomization injection port through the desulfurization agent injection port; Several dust removal and denitrification devices are connected to the bottom end of the reaction tower. The top of the dust removal and denitration device is provided with a flue gas outlet pipe connected to the chimney, and a main fan is arranged on the flue gas outlet pipe. The utility model sets the flue gas desulfurization, dust removal, and denitration operation equipment in a box, and completes the desulfurization, dust removal, and denitrification operations by arranging a multi-stage technical structure in the box, and has the characteristics of simple structure and small equipment footprint. At the same time, it also reduces equipment investment, reduces energy consumption and operating costs for equipment operation.

Description

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

technical field

The utility model 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 technique

During the combustion process of the kiln, a large amount of flue gas will be generated, and the flue gas contains a large amount of dust, _{SO 2} , NO _X . _NOx .

At present, the purification technologies of dust, SO ₂ and NO _X in flue gas at home and abroad are divided into three systems, namely dust removal system, desulfurization system and denitration system. In the process of flue gas treatment, it is necessary to use structural parts and pipes to connect these three systems together, and the connection of such structural parts has relatively large resistance. The connection of the three systems not only covers a large area, but also the investment cost of equipment will be relatively high. high, the energy consumption of equipment operation increases, resulting in increased operating costs.

SUMMARY OF THE INVENTION

The technical problem to be solved by the utility model is to provide a cement rotary kiln flue gas purification device integrating desulfurization, dust removal and denitrification, which can reduce the area of the equipment, reduce equipment investment, and reduce energy consumption and operating costs.

In order to solve the above-mentioned technical problems, the technical solutions adopted by the present invention are as follows.

A cement rotary kiln flue gas purification device integrating desulfurization, dust removal and denitrification, including a box body, which is provided with a reaction tower for flue gas treatment, an ammonia water mechanism for flue gas denitration treatment, and a flue gas treatment. A desulfurization mechanism for desulfurization treatment of gas; the box is provided with a flue gas pipeline connected to the reaction tower and used to connect to the flue gas, the ammonia water mechanism is connected to the flue gas pipeline through the ammonia water atomization injection port, and the desulfurization mechanism The injection port is connected to the flue gas pipeline behind the ammonia water atomization injection port; around the reaction tower, there are several dust removal and denitrification devices connected to the bottom end of the reaction tower and used for dust removal, filtration and denitration of the flue gas. The top of the chimney is provided with a flue gas outlet pipe connected to the chimney, and a main fan for discharging the purified flue gas is arranged on the flue gas outlet pipe.

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

In the above-mentioned cement rotary kiln flue gas purification device integrating desulfurization, dust removal and denitration, a denitration catalyst for denitration of flue gas is arranged in the catalytic layer.

In the above-mentioned cement rotary kiln flue gas purification device integrating desulfurization, dust removal and denitrification, the top end of the dust removal and denitrification device is provided with a pulse soot blower for removing dust in the filter layer, and the bottom end of the dust removal and denitration device is provided with a dust collector for collecting smoke Ash hopper for dust in the air.

In the above-mentioned cement rotary kiln flue gas purification device integrating desulfurization, dust removal and denitrification, the top of the dust removal and denitrification device (10) is provided with a lift valve for opening and closing the connection channel with the flue gas outlet pipe.

The above-mentioned cement rotary kiln flue gas purification device integrating desulfurization, dust removal and denitrification, the desulfurization mechanism includes a desulfurization agent storehouse for storing desulfurization agents and a pipeline connected to an ash hopper for storing circulating ash with active components. The bottom ends of the ash storage, the desulfurizing agent storage and the circulating ash storage are connected to the desulfurizing agent injection port through the desulfurizing agent pipeline, and the desulfurizing agent pipeline is provided with a second roots blower for sending the desulfurizing agent into the desulfurizing agent pipeline.

In the above-mentioned cement rotary kiln flue gas purification device integrating desulfurization, dust removal and denitrification, the pipeline between the circulating ash storage and the ash hopper is provided with a first roots blower for feeding the circulating ash into the circulating ash storage.

In the above-mentioned cement rotary kiln flue gas purification device integrating desulfurization, dust removal and denitration, the desulfurization agent is sodium bicarbonate and calcium hydroxide.

In the above-mentioned cement rotary kiln flue gas purification device integrating desulfurization, dust removal and denitrification, ammonia water with an ammonia water ratio of 20% is arranged in the ammonia water mechanism.

Due to the adoption of the above technical solutions, the technical progress achieved by the present utility model is as follows.

The utility model sets the flue gas desulfurization, dust removal, and denitration operation equipment in a box, and completes the desulfurization, dust removal, and denitrification operations by arranging a multi-stage technical structure in the box, and has the characteristics of simple structure and small equipment footprint. At the same time, it also reduces equipment investment, reduces energy consumption and operating costs for equipment operation.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is the structural representation of the dust removal and denitrification device of the utility model;

Fig. 3 is the working principle diagram of the utility model;

Among them: 1. Flue gas pipeline, 2. Ammonia atomization injection port, 3. Ammonia water mechanism, 4. Desulfurization agent injection port, 5. Flue gas deflector, 6. Reaction tower, 7. Flue gas outlet pipe, 8 .Lifting valve, 9. Pulse blower, 10. Dust removal and denitrification device, 11. Ash hopper, 12. The first Roots blower, 13. Circulating ash storehouse, 14. Desulfurization agent storehouse, 15. The second Roots blower, 16. Main fan, 17. Chimney, 18. Box, 19. Filter layer, 20. Catalytic layer, 21. Air outlet.

Detailed ways

The present utility model will be described in further detail below with reference to the accompanying drawings and specific embodiments.

A cement rotary kiln flue gas purification device integrating desulfurization, dust removal and denitration, its structure is shown in Figure 1-2, including a box 18, a reaction tower 6, an ammonia water mechanism 3, a desulfurization mechanism and a dust removal mechanism are arranged in the box 18. The denitrification device 10, the reaction tower 6 are 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 dedust and filter the flue gas. and denitrification treatment.

The box body 1 is provided with a flue gas pipeline 1. The flue gas pipeline 1 is connected to the reaction tower 6 and used to connect the flue gas to the reaction tower 6. The ammonia water mechanism 3 is connected to the flue gas pipeline 1 through the ammonia water atomization nozzle 2. , the desulfurization mechanism is connected to the flue gas pipeline 1 behind the ammonia water atomization injection port 2 through the desulfurization agent injection port 4, and the dust removal and denitrification devices 10 are arranged in several, which are respectively arranged around the reaction tower 6, and the top of the dust removal and denitrification device 10 passes through The flue gas outlet pipe 7 is connected to the chimney 17, and a main fan 16 is arranged on the flue gas outlet pipe 7 to discharge the purified flue gas.

The denitrification and dust collector 10 is arranged in a cylindrical structure, including a filter layer 19 and a catalytic layer 20. The filter layer 19 is arranged on the outer layer and is used to filter the flue gas and remove the dust in the flue gas. The catalytic layer 20 is arranged in the inner layer. To denitrify and catalyze the flue gas, the center of the denitration dust collector 10 is set as an outlet 21, which is connected to the flue gas outlet pipe 7 to discharge the purified flue gas.

A denitration catalyst is arranged in the catalytic layer 20 to catalyze the denitration of the 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 N ₂ and water H ₂ O after catalytic reaction.

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 denitration device, the dust in the flue gas is filtered through the filter layer, and then the denitration treatment is carried out through the catalytic layer.

The ammonia water mechanism 3 is arranged on the flue gas pipeline 1 through the ammonia water atomization injection port 2, the ammonia water mechanism 3 is provided with ammonia water, and the proportion of the ammonia water is 20%, and the ammonia water in the ammonia water mechanism 3 is sprayed through the ammonia water atomization injection port 2. The flue gas pipeline 1 enters the reaction tower 6 through the flue gas pipeline, and reacts with NO _X in the reaction tower. Since a denitration catalyst is arranged in the dust removal and denitrification device 10, the flue gas is denitrified. After the flue gas containing ammonia water enters the dust removal and denitration device 10, _NOx is removed under the catalytic action of the denitration catalyst, and the purified _NOx is removed. The flue gas is introduced into the chimney 17 by the main fan 16 and discharged.

The top of the reaction tower 6 is provided with a flue gas guide 5 for guiding the flue gas so that the flue gas enters the reaction tower 6 uniformly.

The dust removal and denitration device 10 is provided with a pulse soot blower 9, which is used to remove dust in the filter layer 19, and an ash hopper 11 is provided at the bottom end of the dust removal and denitration device 10, which is used to collect dust in the flue gas. The top of the dust removal and denitrification device 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 removal and denitrification device 10 accumulates a lot and the resistance is large, the poppet valve 8 is closed, and the pulse soot blower 9 performs pulse on-line cleaning on the filter layer 19 in the dedusting and denitrification device 10, and the cleaned dust falls into the bottom. inside the ash hopper 11.

The desulfurization mechanism includes a desulfurization agent warehouse 14 and a circulating ash warehouse 13. The desulfurization agent warehouse 14 is used to store the desulfurization agent, the circulating ash warehouse 13 is used to store the circulating ash with active components, and the bottom ends of the desulfurization agent warehouse 14 and the circulating ash warehouse 13 It is connected to the desulfurizer injection port 4 through the desulfurizer pipeline, which is used to inject the desulfurizer into the flue gas pipeline 1. The desulfurizer pipeline is provided with a second Roots blower 15, which is used to send the desulfurizer into the desulfurizer pipeline, and the The desulfurizing agent is ejected through the desulfurizing agent injection port 4 .

Desulfurizing agent storage 14 stores desulfurizing agent, and the desulfurizing agent adopts sodium bicarbonate and calcium hydroxide.

The circulating ash storage 13 and the ash hopper 11 are connected by a pipeline, and the first roots blower 12 is arranged on the pipeline, and the circulating ash in the ash hopper is sent into the circulating ash storage 13 for recycling.

The desulfurization agent in the desulfurization agent storehouse and the circulating ash storehouse enters the reaction tower from the top of the reaction tower through the desulfurization agent injection port through the second Roots fan for desulfurization reaction, and the circulating ash with active components falling into the ash hopper passes through the first The Roots blower is transported to the circulating ash warehouse for recycling, avoiding the waste of desulfurization agent.

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

The working principle diagram of the utility model is shown in Figure 3. When the flue gas is processed, after the flue gas passes through the flue gas pipeline, the ammonia water mechanism and the desulfurizing agent injection port respectively spray ammonia water and desulfurizing agent to the flue gas in the flue gas pipeline. , the flue gas containing ammonia water and desulfurizer enters the reaction tower for reaction, and the desulfurizer reacts with SO ₂ in the flue gas in the reaction tower to desulfurize the flue gas, and the ammonia water in the reaction tower reacts with NO _X in the flue gas The reaction is denitrified, and 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 efficiency of denitration. in the atmosphere.

Claims (8)

1. A cement rotary kiln flue gas purification device integrating desulfurization, dust removal and denitration, characterized in that it comprises a box body (18), and the box body (18) is provided with a reaction tower (6) for processing the flue gas , an ammonia water mechanism (3) for denitrification of flue gas and a desulfurization mechanism for desulfurization of flue gas; the box (18) is provided with a connection reaction tower (6) for connecting the flue gas The flue gas pipeline (1), the ammonia water mechanism (3) is connected to the flue gas pipe (1) through the ammonia water atomization injection port (2), and the desulfurization mechanism is connected to the ammonia water atomization injection port (4) through the desulfurization agent injection port (4). 2) On the rear flue gas pipeline (1); around the reaction tower (6), there are several dust removal and denitrification devices (10) connected to the bottom end of the reaction tower and used for dust removal, filtration and denitration of the flue gas. The top of the denitrator (10) is provided with a flue gas outlet pipe (7) connected to the chimney (17), and the flue gas outlet pipe (7) is provided with a main fan (16) for discharging purified flue gas. 2. The cement rotary kiln flue gas purification device integrating desulfurization, dust removal and denitrification according to claim 1, characterized in that: the dust removal and denitrification device (10) is a cylindrical structure, and includes an outer layer for cleaning The filter layer (19) for filtering the flue gas and the catalytic layer (20) arranged in the inner layer for denitrification and catalysis of the flue gas, the center of the dust removal and denitrification device (10) is the air outlet connected to the flue gas outlet pipe (7). (twenty one). The flue gas purification device of cement rotary kiln integrating desulfurization, dust removal and denitration according to claim 2, characterized in that: a denitration catalyst for denitrification of 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, characterized in that: the top of the dust removal and denitrification device (10) is provided with a filter layer (19) for cleaning An ash hopper (11) for collecting dust in the flue gas is arranged at the bottom end of the pulse dust blower (9) and 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, characterized in that: the top of the dust removal and denitrification device (10) is provided with a device for opening and closing the flue gas outlet. The air duct (7) is connected to the poppet valve (8) of the passage. 6. The cement rotary kiln flue gas purification device integrating desulfurization, dust removal and denitrification according to claim 4, characterized in that: the desulfurization mechanism comprises a desulfurization agent storehouse (14) for storing desulfurization agents and a pipeline through which the desulfurization agent is stored. Connected to the ash hopper (11) for storing the circulating ash storage (13) with active components, the bottom ends of the desulfurizing agent storage (14) and the circulating ash storage (13) are connected to the desulfurizing agent injection port ( 4), the desulfurizing agent pipeline is provided with a second roots blower (15) for sending the desulfurizing agent into the desulfurizing agent pipeline. 7. The cement rotary kiln flue gas purification device integrating desulfurization, dust removal and denitrification according to claim 6, characterized in that: a pipeline between the circulating ash storehouse (13) and the ash hopper (11) is provided with There is a first roots blower (12) for feeding the circulating ash into the circulating ash storehouse. 8. The cement rotary kiln flue gas purification device integrating desulfurization, dust removal and denitrification according to claim 6, wherein the desulfurizer is one of sodium bicarbonate or calcium hydroxide.

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