Denitration device of rotary cement kiln

Abstract

The utility model discloses a rotary cement kiln denitration device which comprises a dust removal box, an air inlet pipe is fixedly connected to the left side wall of the dust removal box, a top groove is formed in the top face in the dust removal box, a vibration motor is fixedly arranged in the top groove, the output end of the bottom of the vibration motor is fixedly connected with a connecting shaft, and the bottom of the connecting shaft is fixedly connected with an air inlet pipe. An upper filter plate is fixedly connected to the bottom of the connecting shaft, a lower filter screen is fixedly connected to the bottom of the dust removal box, a collecting box is fixedly connected to the bottom of the dust removal box, a first drying box is fixedly connected to the right side wall of the dust removal box, and a drying plate is fixedly connected to the interior of the first drying box; the number of the drying plates is multiple. By arranging the dust removal box, the air inlet pipe, the top groove, the vibration motor, a connecting shaft, an upper filter plate, a lower filter screen, a collecting box, a first drying box and a drying plate, smoke is firstly subjected to dust removal and filtration, impurities such as internal dust are removed, and follow-up pollution is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of industrial flue gas treatment, in particular to a cement rotary kiln denitrification device. Background Art

[0002] During the cement production process, the operation of cement kilns will produce a large amount of nitrogen oxide exhaust gas, which will cause serious pollution to the natural environment if discharged directly. Therefore, it is necessary to denitrify this exhaust gas.

[0003] In the existing cement rotary kiln denitrification device, liquid ammonia is generally sprayed on the flue gas to reduce the nitrogen compounds in the flue gas into nitrogen and water vapor. However, since the flue gas also contains a large amount of dust and alkaline metals, it is easy to cause other pollution. In addition, in the denitrification process, liquid ammonia is used, and the liquid ammonia state is unstable and easy to volatilize. The higher the concentration, the more it volatilizes, resulting in a lot of waste and causing ammonia pollution. Utility Model Content

[0004] The utility model aims to provide a cement rotary kiln denitrification device, which first performs dust removal and filtration on the flue gas to remove impurities such as internal dust to avoid subsequent pollution, then performs denitrification treatment on the filtered flue gas, and separates and recovers the internal volatile ammonia and the product nitrogen through drying and refrigeration of the reacted gas, thereby improving the utilization rate of ammonia, saving resources, and obtaining nitrogen, an important industrial resource.

[0005] To achieve the above-mentioned purpose, a cement rotary kiln denitrification device is provided, comprising: a dust removal box, an air intake pipe is fixedly connected to the left side wall of the dust removal box, a top groove is arranged on the inner top surface of the dust removal box, a vibration motor is fixedly arranged inside the top groove, a connecting shaft is fixedly connected to the bottom output end of the vibration motor, an upper filter plate is fixedly connected to the bottom of the connecting shaft, a lower filter screen is fixedly connected to the bottom of the dust removal box, a collecting box is fixedly connected to the bottom of the dust removal box, a first drying box is fixedly connected to the right side wall of the dust removal box, a drying plate is fixedly connected to the inside of the first drying box, a plurality of drying plates are arranged, and are evenly and staggeredly distributed inside the first drying box, and a first connecting plate is fixedly connected to the right side wall of the first drying box. Taking over, a denitrification box is fixedly connected to the right side of the first connecting pipe, an ammonia supply mechanism is fixedly connected to the rear side wall of the denitrification box, a spray pipe is fixedly connected to the interior of the denitrification box, a nozzle is fixedly connected to the circumferential surface of the spray pipe, a plurality of nozzles are arranged and evenly and staggeredly distributed on the circumferential surface of the spray pipe, a second connecting pipe is fixedly connected to the right side wall of the denitrification box, a second drying box is fixedly connected to the right side of the second connecting pipe, a third connecting pipe is fixedly connected to the right side wall of the second drying box, a liquefaction tank is fixedly connected to the right side of the third connecting pipe, a refrigerator is fixedly connected to the rear side wall of the liquefaction tank, a nitrogen recovery tank is fixedly connected to the top of the liquefaction tank, and a liquid ammonia recovery tank is fixedly connected to the bottom of the liquefaction tank.

[0006] According to the cement rotary kiln denitrification device, the internal structure of the second drying box is consistent with that of the first drying box.

[0007] According to the cement rotary kiln denitrification device, the number of the top troughs is multiple and evenly distributed inside the dust removal box, and the number of the vibration motors and connecting shafts is multiple and all located inside the top troughs.

[0008] According to the cement rotary kiln denitrification device, there are multiple upper filter plates, and they are all fixedly connected to the connecting shaft. The mesh sizes of the multiple upper filter plates increase from left to right.

[0009] According to the cement rotary kiln denitrification device, the bottom of the upper filter plate passes through the lower filter screen.

[0010] According to the cement rotary kiln denitrification device, flow valves are arranged on the circumferential surfaces of the first connecting pipe, the second connecting pipe and the third connecting pipe.

[0011] The above scheme has the following beneficial effects:

[0012] 1. By setting up a dust removal box, an air intake pipe, a top slot, a vibration motor, a connecting shaft, an upper filter plate, a lower filter screen, a collection box, a first drying box and a drying plate, the flue gas is first dust-filtered to remove internal dust and other impurities to avoid subsequent pollution;

[0013] 2. By setting up a denitration box, an ammonia water supply mechanism, a spray pipe, a nozzle, a second connecting pipe, a second drying box, a third connecting pipe, a liquefaction box, a refrigerator, a nitrogen recovery box and a liquid ammonia recovery box, the filtered flue gas is denitrated, and the reacted gas is dried and refrigerated to separate and recover the internal volatile ammonia and the product nitrogen, thereby improving the utilization rate of ammonia, saving resources, and obtaining nitrogen, an important industrial resource.

[0014] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The utility model is further described below in conjunction with the accompanying drawings and embodiments;

[0016] Figure 1 This is a front view of a cement rotary kiln denitrification device of the utility model;

[0017] Figure 2 This is a cross-sectional view of a dust removal box of a cement rotary kiln denitration device of the utility model;

[0018] Figure 3 This is a cross-sectional view of a drying box of a cement rotary kiln denitration device of the utility model;

[0019] Figure 4 The utility model is a cross-sectional view of a denitration box of a cement rotary kiln denitration device.

[0020] Legend:

[0021] 1. Dust removal box; 2. Air intake pipe; 3. Top groove; 4. Vibration motor; 5. Connecting shaft; 6. Upper filter plate; 7. Lower filter; 8. Collecting box; 9. First drying box; 10. Drying plate; 11. First connecting pipe; 12. Denitrification box; 13. Ammonia water supply mechanism; 14. Spray pipe; 15. Spray head; 16. Second connecting pipe; 17. Second drying box; 18. Third connecting pipe; 19. Liquefaction box; 20. Refrigeration machine; 21. Nitrogen recovery box; 22. Liquid ammonia recovery box. DETAILED DESCRIPTION

[0022] This section will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.

[0023] Reference Figure 1-4The utility model embodiment is a cement rotary kiln denitrification device, which includes: a dust removal box 1, an air intake pipe 2 is fixedly connected to the left side wall of the dust removal box 1, a top groove 3 is arranged on the inner top surface of the dust removal box 1, a plurality of top grooves 3 are arranged and evenly distributed inside the dust removal box 1, a plurality of vibration motors 4 and connecting shafts 5 are arranged and are all located inside the top grooves 3, a vibration motor 4 is fixedly arranged inside the top grooves 3, a connecting shaft 5 is fixedly connected to the bottom output end of the vibration motor 4, an upper filter plate 6 is fixedly connected to the bottom of the connecting shaft 5, the vibration motor 4 is started, the upper filter plate 6 is vibrated up and down, so that dust falls below, and the upper filter plate 6 There are multiple numbers of them, and they are all fixedly connected to the connecting shaft 5. The mesh numbers of the multiple upper filter plates 6 increase from left to right, so as to fully filter the passing flue gas and remove impurities and dust. The bottom of the dust removal box 1 is fixedly connected with a lower filter screen 7. The bottoms of the upper filter plates 6 all penetrate the lower filter screen 7, so that the filtered dust falls into the collecting box 8 below. The bottom of the dust removal box 1 is fixedly connected with a collecting box 8. The right side wall of the dust removal box 1 is fixedly connected with a first drying box 9. The interior of the first drying box 9 is fixedly connected with a drying plate 10. There are multiple numbers of drying plates 10, and they are evenly and staggeredly distributed inside the first drying box 9. The right side of the first drying box 9 is fixedly connected with a first drying box 9. A first connecting pipe 11 is fixedly connected to the side wall, a denitration box 12 is fixedly connected to the right side of the first connecting pipe 11, an ammonia supply mechanism 13 is fixedly connected to the rear side wall of the denitration box 12, a spray pipe 14 is fixedly connected to the inside of the denitration box 12, a nozzle 15 is fixedly connected to the circumferential surface of the spray pipe 14, a plurality of nozzles 15 are arranged, and are evenly and staggeredly distributed on the circumferential surface of the spray pipe 14, a second connecting pipe 16 is fixedly connected to the right side wall of the denitration box 12, a second drying box 17 is fixedly connected to the right side of the second connecting pipe 16, and the internal structure of the second drying box 17 is consistent with the first drying box 9, and is used to filter the gas after denitration to remove In addition to water vapor, a third connecting pipe 18 is fixedly connected to the right side wall of the second drying box 17, and a liquefaction box 19 is fixedly connected to the right side of the third connecting pipe 18. A refrigerator 20 is fixedly connected to the rear side wall of the liquefaction box 19 for refrigerating the interior of the liquefaction box 19 to liquefy the ammonia in the internal gas. The liquefaction temperature of ammonia is -33.35°, and the liquefaction temperature of nitrogen is -195.79°, thereby separating the ammonia from the product nitrogen. A nitrogen recovery box 21 is fixedly connected to the top of the liquefaction box 19 for recovering gaseous nitrogen. A liquid ammonia recovery box 22 is fixedly connected to the bottom of the liquefaction box 19, and the liquefied ammonia enters the liquid ammonia recovery box 22 below.

[0024] Flow valves are provided on the circumferential surfaces of the first connecting pipe 11 , the second connecting pipe 16 and the third connecting pipe 18 for controlling the denitration speed.

[0025] Working principle: The flue gas generated by the cement rotary kiln enters the dust removal box 1 from the air inlet pipe 2, and the internal vibration motor 4 is started to make the upper filter plate 6 below vibrate up and down, thereby filtering the passing flue gas and removing internal dust and impurities. The removed dust and impurities enter the collecting box 8 below and are collected. The filtered gas is dried by the first drying box 9 and then enters the denitrification box 12. The ammonia water is provided by the ammonia water supply mechanism 13 and enters the spray pipe 14, and then is sprayed out through the nozzle 15 to react with the nitride in the flue gas to generate nitrogen and water vapor. At the same time, part of the ammonia in the ammonia water volatilizes, and then passes through the second drying box 17 and enters the liquefaction box 19. Under the action of the refrigerator 20, the ammonia gas is liquefied into liquid and enters the liquid ammonia recovery box 22, while the gaseous nitrogen and other gases enter the upper nitrogen recovery box 21 to complete recycling and reuse.

[0026] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A cement rotary kiln denitrification device, characterized in that: include: A dust removal box (1), wherein an air intake pipe (2) is fixedly connected to the left side wall of the dust removal box (1), a top groove (3) is provided on the inner top surface of the dust removal box (1), a vibration motor (4) is fixedly provided inside the top groove (3), a connecting shaft (5) is fixedly connected to the bottom output end of the vibration motor (4), an upper filter plate (6) is fixedly connected to the bottom of the connecting shaft (5), a lower filter screen (7) is fixedly connected to the bottom of the dust removal box (1), a collecting box (8) is fixedly connected to the bottom of the dust removal box (1), a first drying box (9) is fixedly connected to the right side wall of the dust removal box (1), a drying plate (10) is fixedly connected to the inside of the first drying box (9), a plurality of drying plates (10) are provided and are evenly and staggeredly distributed inside the first drying box (9), a first connecting pipe (11) is fixedly connected to the right side wall of the first drying box (9), and a denitration box is fixedly connected to the right side of the first connecting pipe (11) (12), an ammonia water supply mechanism (13) is fixedly connected to the rear side wall of the denitration box (12), a spray pipe (14) is fixedly connected inside the denitration box (12), a nozzle (15) is fixedly connected to the circumferential surface of the spray pipe (14), a plurality of nozzles (15) are arranged, and are evenly and staggeredly distributed on the circumferential surface of the spray pipe (14), a second connecting pipe (16) is fixedly connected to the right side wall of the denitration box (12), and the second connecting pipe A second drying box (17) is fixedly connected to the right side of the drying box (16); a third connecting pipe (18) is fixedly connected to the right side wall of the second drying box (17); a liquefaction box (19) is fixedly connected to the right side of the third connecting pipe (18); a refrigerator (20) is fixedly connected to the rear side wall of the liquefaction box (19); a nitrogen recovery box (21) is fixedly connected to the top of the liquefaction box (19); and a liquid ammonia recovery box (22) is fixedly connected to the bottom of the liquefaction box (19).

2. A cement rotary kiln denitrification device according to claim 1, characterized in that: The internal structure of the second drying box (17) is consistent with that of the first drying box (9).

3. A cement rotary kiln denitrification device according to claim 1, characterized in that: The number of the top grooves (3) is multiple and evenly distributed inside the dust removal box (1); the number of the vibration motors (4) and the connecting shafts (5) is multiple and all are located inside the top grooves (3).

4. A cement rotary kiln denitrification device according to claim 1, characterized in that: There are a plurality of upper filter plates (6), all of which are fixedly connected to the connecting shaft (5), and the mesh sizes of the plurality of upper filter plates (6) increase sequentially from left to right.

5. A cement rotary kiln denitrification device according to claim 1, characterized in that: The bottom of the upper filter plate (6) passes through the lower filter screen (7).

6. A cement rotary kiln denitrification device according to claim 1, characterized in that: Flow valves are arranged on the circumferential surfaces of the first connecting pipe (11), the second connecting pipe (16) and the third connecting pipe (18).

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