CN217646189U

CN217646189U - Corrosion-resistant ammonia pyrolysis device

Info

Publication number: CN217646189U
Application number: CN202221315395.0U
Authority: CN
Inventors: 刘文东; 刘怡铭
Original assignee: Foshan Ruiqi Environmental Protection Equipment Co ltd
Current assignee: Foshan Ruiqi Environmental Protection Equipment Co ltd
Priority date: 2022-05-30
Filing date: 2022-05-30
Publication date: 2022-10-25
Anticipated expiration: 2032-05-30

Abstract

The utility model discloses a corrosion-resistant ammonia pyrolysis device, belong to pyrolysis device technical field, including outer cavity, outer cavity below and top are equipped with air intake and air outlet respectively, the high temperature flue gas gets into outer cavity by the air intake, and discharge from air outlet department, be equipped with the inner tube in the outer cavity and fuse the chamber, it is located the inner tube top to fuse the chamber, inner tube below import department is equipped with the equal wind reposition of redundant personnel module, equal wind reposition of redundant personnel module top is equipped with following current spraying layer, inner tube top exit is equipped with the spraying layer against the current, be formed with laminar flow chamber between inner tube lateral wall and outer cavity inboard wall, laminar flow chamber communicates the air intake respectively and fuses the chamber, because the laminar flow protective layer forms the isolation between the lateral wall of atomizing urea solution granule and outer cavity, can effectually avoid atomizing urea solution granule and outer cavity inside wall contact, play the protection outer cavity inside wall, avoid the effect that the outer cavity inside wall is corroded.

Description

Corrosion-resistant ammonia pyrolysis device

Technical Field

The utility model relates to a pyrolysis device technical field, in particular to corrosion-resistant ammonolysis device.

Background

In the current SCR method and SNCR method denitration technology, there are three main reducing agents used: liquid ammonia, ammonia water and urea. Liquid ammonia belongs to dangerous chemicals, the transportation and storage requirements of the dangerous chemicals are strict, potential safety hazards exist in the transportation and storage processes of ammonia water, and more power plants tend to adopt a urea pyrolysis ammonia production process.

The process for preparing ammonia by pyrolyzing urea has the advantages of simple system, low investment cost, stable operation, high response speed, small maintenance amount and the like. However, in practical applications, there are still more defects, such as: the urea pyrolysis furnace has the problem that the urea solution and hot air are not fully mixed, so that the pyrolysis effect is influenced; the urea pyrolysis furnace needs to be made of urea-grade stainless steel materials, the service life is short, the manufacturing cost is high, crystals in the furnace can occupy the space of a pyrolysis chamber, a tail pipe at the bottom is blocked, the outlet air quantity is reduced, the ammonia supply quantity of a system is insufficient, and the reliability of a denitration device is influenced.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects existing in the prior art, the utility model provides a corrosion-resistant ammonolysis device.

The utility model provides a technical scheme that its technical problem adopted is: the utility model provides a corrosion-resistant ammonia pyrolysis device, includes outer cavity, outer cavity below and top are equipped with air intake and air outlet respectively, are equipped with the inner tube in the outer cavity and fuse the chamber, fuse the chamber and are located the inner tube top, and inner tube below import department is equipped with the samming and shunts the module, and the samming is shunted the module top and is equipped with following current and spouts the fog layer, and inner tube top exit is equipped with against the current and spouts the fog layer, is formed with the laminar flow chamber between inner tube lateral wall and outer cavity inboard wall, and the laminar flow chamber communicates the air intake respectively and fuses the chamber.

Preferably, a plurality of groups of downstream rotary atomizing nozzles are arranged in the downstream spraying layer, the air-equalizing and shunting module comprises a plurality of groups of cyclone modules, each cyclone module comprises a guide cylinder and cyclone blades rotatably arranged in the guide cylinder through a cyclone rotating shaft, the downstream rotary atomizing nozzles and the cyclone blades are coaxially arranged, and the rotary spraying direction of the downstream rotary atomizing nozzles is opposite to the rotary direction of the cyclone blades.

Preferably, the lower end of the rotational flow shaft is provided with a tapered portion, and an outer tapered surface of the tapered portion faces downward.

Preferably, a plurality of groups of countercurrent rotary atomizing nozzles are arranged in the countercurrent spray layer.

Preferably, the inner cylinder is fixedly connected with the outer cavity through a fixing plate.

Preferably, the inner diameter of the upper part of the fusion cavity is gradually reduced towards the air outlet.

The beneficial effects of the utility model are that:

1. because the advection airflow protective layer is isolated between the atomized urea solution particles and the side wall of the outer cavity, the atomized urea solution particles can be effectively prevented from contacting with the inner side wall of the outer cavity, and the effects of protecting the inner side wall of the outer cavity and preventing the inner side wall of the outer cavity from being corroded are achieved;

2. due to the adoption of a downward-in and upward-out airflow flowing mode and the utilization of a hot air rising principle, the heat energy absorbed by pyrolysis evaporation can be compensated, so that the temperature difference at the tail end of the pyrolysis device is reduced;

3. owing to set up two sets of spray layers, the pyrolysis reaction in the pyrolysis device is gone on in two-layerly, and wherein the first layer pyrolysis is the inflation compression in the inner tube, and the second floor pyrolysis evaporates the pressure boost in inner tube top exit, and the expanded speed of whole evaporation is more mitigateed, can improve the solubility of ammonia in the air, avoids urea pyrolysis incomplete, formation crystallization.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 isbase:Sub>A schematic cross-sectional view taken along line A-A of FIG. 1;

FIG. 3 is a schematic cross-sectional view taken along line B-B of FIG. 1;

FIG. 4 is a schematic structural diagram of a cyclone module (including a downstream rotary atomizing nozzle) according to an embodiment of the present invention;

fig. 5 is a schematic view of the spiral disturbance and impact convection effect of the swirl module and the downstream rotary atomizing nozzle in the embodiment of the present invention;

fig. 6 is a schematic diagram of the working state of the embodiment of the present invention (the arrows and the spiral curves are schematic diagrams of the fluid flow traces).

In the figure, 10, the outer cavity; 11. an air inlet; 12. an air outlet; 21. an inner barrel; 22. a fixing plate; 31. a fusion chamber; 40. an air equalizing and shunting module; 41. a swirling flow module; 42. a draft tube; 43. a rotational flow rotating shaft; 44. a tapered portion; 45. a swirl vane; 51. a forward flow spray layer; 52. rotating the atomizing nozzle downstream; 61. a countercurrent spray layer; 62. a counter-current rotating atomizing nozzle; 71. a laminar flow chamber.

Detailed Description

The following describes the present invention with reference to the accompanying drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features related to the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

As shown in fig. 1-6, the utility model provides a corrosion-resistant ammonia pyrolysis device, including outer cavity 10, outer cavity 10 below and top are equipped with air intake 11 and air outlet 12 respectively, high temperature flue gas gets into outer cavity 10 by air intake 11, and discharge from air outlet 12, the device adopts the air current flow mode of entering from top to bottom (in this embodiment, the heat energy source of pyrolysis is high temperature flue gas self-heat, wherein air outlet 12 department, high temperature flue gas temperature is greater than or equal to 650 ℃, the acquirement of high temperature flue gas does not belong to the innovation point of this scheme, therefore do not give unnecessary details), be equipped with inner tube 21 and fusion chamber 31 in outer cavity 10, wherein inner tube 21 passes through fixed plate 22 and outer cavity 10 fixed connection, fusion chamber 31 is located inner tube 21 top, inner tube 21 below import department is equipped with even wind reposition of redundant personnel module 40, even wind reposition of redundant personnel module 40 top is equipped with downstream spraying layer 51, inner tube 21 top is equipped with downstream spraying layer 61, upstream spraying layer 51 and upstream spraying layer 61 all are used for atomizing to form urea solution granule, inner tube 21 lateral wall and outer cavity 10 inboard are formed with the laminar flow and are 71, laminar flow chamber 71, laminar flow and laminar flow chamber 31 are connected respectively.

When the device works, after high-temperature flue gas enters the outer cavity 10 from the air inlet 11, the high-temperature flue gas is shunted, one part of the high-temperature flue gas enters the inner cylinder 21 through the air equalizing and shunting module 40, the other part of the high-temperature flue gas enters the laminar flow cavity 71 between the inner cylinder 21 and the outer cavity 10, and the laminar flow cavity 71 is guided, so that the high-temperature flue gas can flow along the inner side wall of the outer cavity 10 after entering the fusion cavity 31, namely, an advection airflow protective layer flowing towards the air outlet 12 is formed on the outer side of the fusion cavity 31, the high-temperature flue gas is fully mixed with atomized urea solution particles after entering the inner cylinder 21, and is subjected to pyrolysis reaction to generate ammonia gas, and then enters the fusion cavity 31, compared with the prior art, because the advection airflow protective layer forms isolation between the atomized urea solution particles and the side wall of the outer cavity 10, the atomized urea solution particles can be effectively prevented from contacting the inner side wall of the outer cavity 10, the inner side wall of the outer cavity 10 can be protected, the inner side wall of the outer cavity 10 can be prevented from being corroded, after the scheme is adopted, only the inner cylinder 21 needs to be subjected to anticorrosion treatment, if a urea-grade stainless steel material is adopted, the outer cavity 10 can adopt a common carbon steel, and the overall cost of the device can be reduced, and the service life of the device can be effectively prolonged; in addition, due to the adoption of a downward-inlet and upward-outlet airflow flowing mode, the heat energy absorbed by pyrolysis evaporation can be compensated by utilizing a hot air rising principle, so that the temperature difference at the tail end of the pyrolysis device is reduced; owing to set up two sets of spray layers, the pyrolysis reaction in the pyrolysis device is gone on in two-layerly, and wherein the first layer pyrolysis is the inflation compression in inner tube 21, and the second floor pyrolysis evaporates the pressure boost in inner tube 21 top exit, and the expanded speed of whole evaporation is more mitigateed, can improve the solubility of ammonia in the air, avoids urea pyrolysis incomplete, formation crystallization.

Furthermore, a plurality of sets of downstream rotary atomizing nozzles 52 are arranged in the downstream spraying layer 51, a plurality of sets of upstream rotary atomizing nozzles 62 are arranged in the upstream spraying layer 61, the air-equalizing and flow-dividing module 40 comprises a plurality of sets of cyclone modules 41, each cyclone module 41 comprises a guide cylinder 42 and a cyclone blade 45 rotatably arranged in the guide cylinder 42 through a cyclone rotating shaft 43, the downstream rotary atomizing nozzles 52 and the cyclone blades 45 are coaxially arranged, the rotary spraying direction of the downstream rotary atomizing nozzle 52 is opposite to the rotary direction of the cyclone blade 45, after the high-temperature flue gas enters the air-equalizing and flow-dividing module 40, part of the high-temperature flue gas enters the cyclone modules 41, the cyclone blades 45 form spiral disturbance airflow, and part of the high-temperature flue gas passes through gaps among the cyclone modules 41 to form jet-like airflow, wherein the rotary spraying direction of the downstream rotary atomizing nozzle 52 is opposite to the rotary direction of the cyclone blades 45, namely the rotary flowing direction of the atomized urea solution particles is opposite to the rotary flow direction of the spiral disturbance airflow, so that the atomized urea solution particles and the spiral disturbance airflow form continuous impact convection, the atomized urea solution particles can be further refined, and the mixing efficiency of the high-temperature flue gas is improved; then the atomized urea solution particles and the high-temperature flue gas form mixed diffusion turbulence at an outlet above the inner cylinder 21, and the mixed diffusion turbulence is blocked by the advection airflow protective layer, so that the mixed diffusion turbulence is prevented from corroding the outer cavity 10.

Furthermore, the lower end of the rotational flow rotating shaft 43 is provided with a conical part 44, the outer conical surface of the conical part 44 faces downwards, and when high-temperature flue gas enters from the lower part of the rotational flow module, the high-temperature flue gas is compressed and accelerated under the action of the conical part 44.

Further, the inner diameter of the upper part of the fusion chamber 31 in the direction of the air outlet 12 is gradually reduced, and the gas in the fusion chamber 31 is compressed by gradually reducing the inner diameter of the upper part of the fusion chamber 31, so that the dissolving uniformity of ammonia in the air is improved.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in the embodiments without departing from the principles and spirit of the invention, and these embodiments are still within the scope of the invention.

Claims

1. The utility model provides a corrosion-resistant ammonolysis device, a serial communication port, including outer cavity (10), outer cavity (10) below and top are equipped with air intake (11) and air outlet (12) respectively, be equipped with inner tube (21) in outer cavity (10) and fuse chamber (31), it is located inner tube (21) top to fuse chamber (31), inner tube (21) below import department is equipped with wind-uniforming reposition of redundant personnel module (40), wind-uniforming reposition of redundant personnel module (40) top is equipped with following current spraying layer (51), inner tube (21) top exit is equipped with adverse current spraying layer (61), inner tube (21) lateral wall and outer cavity (10) inboard wall are formed with laminar flow chamber (71), laminar flow chamber (71) communicate air intake (11) and fuse chamber (31) respectively.

2. The corrosion-resistant ammonia pyrolysis device according to claim 1, wherein a plurality of sets of downstream rotary atomizing nozzles (52) are arranged in the downstream spraying layer (51), the air-equalizing and flow-dividing module (40) comprises a plurality of sets of cyclone modules (41), each cyclone module (41) comprises a guide shell (42) and a cyclone blade (45) rotatably arranged in the guide shell (42) through a cyclone rotating shaft (43), the downstream rotary atomizing nozzles (52) are coaxially arranged with the cyclone blades (45), and the rotary spraying direction of the downstream rotary atomizing nozzles (52) is opposite to the rotary direction of the cyclone blades (45).

3. The corrosion-resistant ammonia pyrolysis apparatus according to claim 2, wherein the lower end of the swirling flow rotary shaft (43) is provided with a tapered portion (44), and an outer tapered surface of the tapered portion (44) is directed downward.

4. The apparatus according to claim 1, wherein a plurality of sets of counter-current rotary atomizing nozzles (62) are provided in the counter-current spray bed (61).

5. The corrosion-resistant ammonia pyrolysis apparatus of claim 1, wherein the inner drum (21) is fixedly connected to the outer chamber (10) by a fixing plate (22).

6. The apparatus according to claim 1, wherein the upper portion of the fusion chamber (31) has a gradually decreasing inner diameter in a direction towards the outlet (12).