CN210584107U

CN210584107U - Dust pelletizing system of urea prilling tower

Info

Publication number: CN210584107U
Application number: CN201921423009.8U
Authority: CN
Inventors: 周列
Original assignee: Shanghai Jingye Environmental Protection And Energy Technology Co ltd
Current assignee: Shanghai Jingye Environmental Protection And Energy Technology Co ltd
Priority date: 2019-08-29
Filing date: 2019-08-29
Publication date: 2020-05-22
Anticipated expiration: 2029-08-29

Abstract

The utility model provides a dust removal system of a urea prilling tower, which comprises a top draught fan, a clean room, a filter component mounting part shell and a tower body, wherein the top draught fan is arranged on the top of the urea prilling tower above the clean room, and the top draught fan is only arranged along the peripheral edge of the top of the urea prilling tower; the top of the tower that installs the top draught fan is all marginal and the coaxial setting of filtering component installation department casing all around, and its diameter is greater than the diameter of filtering component installation department casing to the vertical projection position of top draught fan all is outside the vertical projection of filtering component installation department casing. The mode of a plurality of top induced draft fans is adopted for distributed induced draft, so that the influence of the load of the whole induced draft fan on the tower body is reduced; the draught fan is installed in a mode of avoiding the filtering component, so that convenience in daily maintenance of the filtering component is improved, the filtering component can be conveniently and directly replaced, the shutdown maintenance time is further shortened, and the production efficiency of the urea granulation tower is greatly improved.

Description

Dust pelletizing system of urea prilling tower

Technical Field

The utility model belongs to the technical field of the industry removes dust, concretely relates to dust pelletizing system of urea prilling tower, its recovery that is applicable to the urea dust of urea prilling tower.

Background

The urea granulation process can discharge a large amount of tail gas in the production process, the tail gas contains a large amount of urea dust, and the untreated urea dust scatters and settles with the air everywhere to cause serious environmental pollution. In order to solve the problem of exhaust emission pollution of a urea prilling tower, a water washing dust removal device is usually adopted at present, the water washing dust removal device is arranged on the ground or the top of a tower, atomized fine water drops are used for adsorbing dust particles in exhaust, a liquid collecting tank is arranged for recovering washing liquid, the washing liquid is subjected to processes such as evaporation and the like to remove moisture, and a urea raw material is recovered. However, these washing dust-removing devices need to be provided with a large number of pipelines, water pumps, showers and other equipment to convey the washing liquid to the designated dust-removing part, and the cost is high. Secondly, in the operation and maintenance process of the water washing equipment, a large amount of water resources and electric power resources are consumed, and the energy consumption is remarkable. These add considerably to the production costs of the urea granulation process.

In order to overcome the defects of the prior art and reduce the production cost of the urea granulation process, scientific research technicians invest a large amount of manpower and material resources to research a dry dedusting technology, and compared with water washing dedusting, the dry technology not only reduces an extra air supply and liquid conveying pipeline of equipment, but also greatly reduces the complexity of the equipment and further reduces the operation and maintenance cost of the equipment; meanwhile, the raw material loss is reduced, and the production economic benefit is greatly improved. The installation of the dust removal fan is a problem to be continuously solved, the current solution is to install an integral fan at the top of the urea prilling tower for dust removal or use a large fan for integral dust removal, but because the dry granulation technology belongs to the transformation of the existing water washing technology or the transformation of the existing urea prilling tower, the construction of a newly-built urea prilling tower for integral overall layout installation does not exist; the whole fan or the big fan arranged on the original prilling tower aggravates the bearing load of the urea prilling tower, and the risk load when the urea prilling tower runs is further increased. In addition, because the load distribution at the top of the tower is unbalanced, the load of the urea prilling tower is unbalanced, and the resonance is influenced by the vibration of a fan, so that the service life of the top of the tower is further shortened.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects in the prior art, the applicant provides a dust removal system of a urea prilling tower through multiple designs and researches, and the dust removal system is suitable for recovering urea dust of the urea prilling tower. The influence of uneven load in the prior art is solved, the occupation ratio of the filter bag in the production space is enlarged, and the production efficiency is greatly improved; still further promoted the life of filter bag to realized online maintenance, and then promoted production and operation economic indicator.

According to the technical scheme of the utility model, a dust removal system of a urea prilling tower is provided, which comprises a top draught fan, a clean room, a filter component mounting part shell and a tower body, wherein the clean room is arranged on the filter component mounting part shell, the shape of the filter component mounting part shell is matched with that of the urea prilling tower, the top draught fan is arranged on the top of the urea prilling tower on the clean room, and the top draught fan is only arranged along the peripheral edge of the clean room of the urea prilling tower and is used for providing distributed air flow; the edge all around on installing the clean room of top draught fan sets up with filtering component installation department casing is coaxial, installs the diameter that the edge all around on the clean room of top draught fan is greater than filtering component installation department casing to the vertical projection position of top draught fan all is outside the vertical projection of filtering component installation department casing.

Preferably, the top induced draft fan is a variable frequency fan; the top draught fan is an axial flow fan.

Further, the dust removal system of the urea prilling tower comprises a blowing system, wherein the blowing system is arranged above the cleaning chamber and is arranged at a certain distance from the cleaning chamber. The tower body is provided with a filter assembly mounting part shell, and the filter assembly mounting part shell is arranged on the side edge of the top of the tower body and is used for providing high-pressure blowing air flow of a blowing system. Further, including the fan support, the fan support mounting is on the lateral wall at clean room top for fixed mounting top draught fan makes the top draught fan firmly as an organic whole with the clean room rigid coupling.

Preferably, the cleaning chamber is formed with a "flange-like" structure on the filter assembly mounting housing, where steel structures are used to support the "flange-like" structure of the cleaning chamber.

Furthermore, the bag washing system is hung on the bottom surface of the cleaning chamber and used for spraying operation, namely cleaning operation, on the filter assembly from the outer side of the filter assembly. The central diameter of the shell of the filter component mounting part is slightly smaller than that of the tower body.

Further, a dust removal system of a urea prilling tower is provided, which is different from the dust removal system in that: the clean room adopts the structure rather than the equal diameter of filter component installation department casing below, and top draught fan and filter component all surround the empty space above the granulation and set up, and top draught fan sets up the installation with the filter component is each other spaced apart and the projection of top draught fan in vertical direction does not overlap with the projection of filter component in vertical direction.

Further, a dust removal system of a urea prilling tower is provided, which is different from the dust removal system in that: the clean room adopts the structure rather than the equal diameter of filter component installation department casing below, and top draught fan sets up around same center pin with filter component, and top draught fan sets up the installation and the projection of top draught fan in vertical direction and filter component on vertical direction is not overlapped with filter component at filter component mutual interval.

Compared with the prior art, the utility model provides a dust pelletizing system of urea prilling tower has following technical advantage:

firstly, distributed induced draft is carried out by adopting a mode of a plurality of top induced draft fans, so that the influence of the load of the whole induced draft fan on a tower body is reduced; the draught fan is installed in a mode of avoiding the filtering component, so that convenience in daily maintenance of the filtering component is improved, the filtering component can be conveniently and directly replaced, the shutdown maintenance time is further shortened, and the production efficiency of the urea granulation tower is greatly improved.

And secondly, the use of distributed air flow promotes the air flow situation distribution inside the prilling tower, and is favorable for the recovery of urea dust of the urea prilling tower.

The filter assembly is suitable for the intensive parallel arrangement of the filter assemblies, so that the occupation ratio of the filter assemblies in the production space is enlarged, and the production efficiency is greatly improved; still promoted filtering component's life to realized online maintenance, and then promoted production and operation economic indicator.

Drawings

Fig. 1 is an overall schematic view of a dedusting system of a urea prilling tower according to the present invention;

FIG. 2 is a schematic half-sectional view of the dusting system shown in FIG. 1;

FIG. 3 is a top view of the dusting system shown in FIG. 1;

FIG. 4 is a perspective view of a quarter section of the dusting system shown in FIG. 1, taken along the central axis;

FIG. 5 is a schematic top view of a second top fan installation of a dedusting system for a urea prilling tower according to the present invention;

FIG. 6 is a schematic top view of a third top fan installation of a dedusting system for a urea prilling tower according to the present invention.

The reference numbers in the figures are as follows: the top draught fan 1, the jetting system 2, the clean room 3, the filter assembly installation part shell 4, the air source system 5, the tower body 6, the fan bracket 7, the steel structure 8, the bag washing system 9, the filter assembly 10 and the granulation room 11.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. Additionally, the scope of the present invention should not be limited to the particular structures or components described below or to the particular parameters.

The invention is further explained by combining the attached drawings of the specification.

As shown in fig. 1-4, the utility model provides a dust removal system of urea prilling tower, it mainly includes top draught fan 1, clean room 3 and filter assembly installation department casing 4, tower body 6, wherein clean room 3 sets up on filter assembly installation department casing 4, the shape of filter assembly installation department casing 4 and the shape looks adaptation of urea prilling tower, top draught fan 1 sets up on the urea prilling tower top of clean room 3, top draught fan 1 only sets up along the edge all around on the clean room of urea prilling tower, be used for providing the distributed air current; install the edge all around on the clean room of top draught fan 1 and filter assembly installation department casing 4 coaxial setting, install the diameter that the edge all around on the clean room of top draught fan 1 is greater than filter assembly installation department casing 4's diameter to the vertical projection position of top draught fan 1 all is outside filter assembly installation department casing 4's vertical projection. The top induced draft fan 1 is a variable frequency fan, and is preferably an axial flow fan. When reforming transform to original washing unit, filtering component installation department casing 4 is washing installation department casing.

Further, the dust removal system of the urea prilling tower further comprises a blowing system 2, an air source system 5, a fan bracket 7, a steel structure 8, a bag washing system 9 and a filtering assembly 10. The blowing system 2 is arranged above the clean room, is arranged at a distance from the clean room and is used for intermittently providing strong blowing air flow, and the blowing air flow can intermittently blow the filter assembly 10, so that the filtering efficiency of the filter assembly 10 is improved. The air supply system 5 is a high-pressure air compressor, which is installed at the top side of the tower body 6 and close to the filter assembly installation part shell 4, and is used for providing high-pressure blowing air flow of the blowing system 2. The fan bracket 7 is arranged on the side wall of the top of the clean room and is used for fixedly mounting the top draught fan 1, so that the top draught fan 1 is fixedly connected with the clean room into a whole, and the possibility that the top draught fan 1 causes the clean room to generate resonance is further reduced; because the top induced draft fan 1 is only installed around the peripheral edge of the top of the clean room and far away from the central axis of the clean room, the top of the filter assembly is avoided, namely the top of the filter assembly is not installed and is not overlapped with the filter assembly in the vertical position, and therefore the reinforcing effect of the fan bracket 7 on the top induced draft fan 1 can resist strong wind and other unpredictable vibration.

The utility model discloses technical scheme and prior art scheme's very big difference lie in, with clean room increase on horizontal, the central radius of clean room is greater than the central radius of the filter assembly installation department casing 4 below it promptly, and the clean room forms the structure of "flange form" on filter assembly installation department casing 4, adopts steel construction 8 to support the structure of "flange form" of clean room here. The steel structure 8 may take the form of an i-beam or spider or other support structure that is secured to the side of the filter assembly mounting portion housing 4 and supports the underside of the "flange-like" structure of the cleaning chamber.

The bag washing system 9 is suspended on the bottom surface of the clean room and is used for spraying, namely cleaning, the filter assembly from the outer side of the filter assembly. The bag washing system 9 adopts a water flow spraying device, preferably a columnar sector spraying device, also can adopt a point spraying device, and most preferably adopts a shower type spraying device; furthermore, the adopted spraying device can surround the filter assemblies which are densely arranged, and the filter assembly group is sprayed in a surrounding manner from the periphery; or the spraying device can be arranged at the gap between the filter assemblies to rotationally spray and wash the filter assemblies at the periphery.

The filtering component 10 is a core component of a dust removal system of the urea prilling tower, is densely and parallelly arranged and is used for filtering out dust in the urea prilling tower, the urea dust is isolated outside the filtering component 10, and clean gas is conveyed to a cleaning room from a cavity of the filtering component 10. The central diameter of the shell of the filter component mounting part is slightly smaller than that of the tower body.

The technical scheme of the utility model among, many top draught fans 1 produce powerful distributed air current, and the confluence of distributed air current forms powerful air current, further makes dusty gas in the tower body form to the dusty gas stream that the top of the tower flows, and dusty gas flows through filtering component 10 and filters and become clean gas entering clean room 3.

As shown in fig. 1, according to the production area of the urea prilling tower and the number of the filter assemblies, the number of the blowing systems arranged on the tower top is generally 5-8 nozzles arranged in parallel in one blowing system, and each nozzle corresponds to 3-6 sub-nozzles of the filter assemblies; or the blowing system is arranged by adopting an airflow pipeline, the airflow pipeline is respectively provided with sub-nozzles corresponding to each filter assembly, and the airflow pipeline forms grid distribution. Furthermore, the gas supply pipelines adopted by the blowing system are arranged in parallel in a plurality of rows, when the gas collection box is arranged in the middle of the cleaning room, the two rows of gas supply pipelines are respectively arranged at two sides of the gas collection box, and the number of the gas supply pipelines in each row can be arranged according to the requirement; when the gas collection box is arranged on one side of the clean room, a single-row gas supply pipeline is used. Each row of gas supply pipelines preferably consists of 3-30 blowing pipes, and preferably 7-15 blowing pipes; the lower end of each injection pipe is connected with a plurality of nozzles, and the nozzles are connected with filter bags (filter components).

As shown in fig. 1, compare in the deashing system that uses among the prior art to come from whole fan, the utility model discloses use independent high pressurized air source system 5 and jetting system linkage, it has the fault rate low, the controllable obvious advantage of jetting effect. The independent high-pressure air source system 5 is matched with an independent power supply and control system, so that the spraying and blowing of the filtering component are further realized under the condition that the urea granulation operation is not interrupted frequently or the interruption time is very short; meanwhile, the defects that urea granulation downtime is long and the failure rate is high when the last generation of dry cleaning and dust removing system is used for spraying only by using one spraying and blowing system and by using the air flow of a draught fan are overcome. The utility model discloses a jetting system and 9 preferred uses same set of control system of washing bag system be integrated logic control system promptly, has realized redundant control, further promotes work efficiency.

As shown in FIG. 2, the utility model discloses a steel frame construction consolidates former filter assembly installation department casing 4, and intensive side by side installation has filter assembly 10 in filter assembly installation department casing 4, but connect the jetting of installing the automatic control closure or opening and link the festival in filter assembly 10 upper end, and the jetting is linked festival upper end and the fixed flexonics of jetting system, and the jetting is linked festival lower extreme and is connected with the meshing of filter assembly movable. When the air needs to be blown, the lower end of the blowing link joint is meshed with the filtering component through the control system, and the air flow generated by the blowing system enters the filtering component at a high speed through the blowing link joint; when the blowing is not needed, the lower end of the blowing link joint is connected with the filtering component in a staggered mode through the control system, and the cleaning airflow generated by the filtering component enters the cleaning chamber.

As shown in fig. 3, top induced draft fans 1 (shown as small right circles) are provided at the peripheral edges of the clean room, which do not overlap the filter assembly 10 at the coaxial center of the clean room. A left blowing system and a right blowing system are arranged in the middle of the densely arranged filter assemblies 10. As shown in fig. 4, the filter assembly mounting portion housing is reinforced by a diagonal bracket. In addition, the outside of the tower body 6 is provided with a special maintenance elevator or a step ladder or a climbing frame, which is convenient for the upper and lower tower tops of the working personnel.

In further embodiments, the top fans are arranged in other ways, for example as shown in fig. 5-6, fig. 5 is a schematic top view of a second top fan installation of the dedusting system of the urea prilling tower, and fig. 6 is a schematic top view of a third top fan installation of the dedusting system of the urea prilling tower. In the second and third top fan installations, the clean room may be of the same construction as described herein above, i.e. the clean room is enlarged laterally, i.e. the center radius of the clean room is greater than the center radius of the filter assembly mounting housing below it, the clean room forming a "flange-like" structure on the filter assembly mounting housing; the cleaning chamber may also be configured differently from that described above, i.e., the cleaning chamber may be configured to have a diameter (in the same body housing) that is the same as the diameter of the filter assembly mounting housing below it. That is, in an embodiment, the clean room has a structure with the same diameter as the housing of the filter component mounting part below the clean room, the top induced draft fan 1 and the filter component 10 are arranged around the empty space above the granulation chamber 11, the top induced draft fan 1 and the filter component 10 are arranged at intervals, and the projection of the top induced draft fan 1 in the vertical direction is not overlapped with the projection of the filter component 10 in the vertical direction.

In another embodiment, the clean room adopts the structure of the same diameter as the filter component installation part shell below the clean room, the top induced draft fan 1 and the filter component 10 are arranged around the same central shaft, the top induced draft fan 1 and the filter component 10 are arranged at intervals, and the projection of the top induced draft fan 1 in the vertical direction is not overlapped with the projection of the filter component 10 in the vertical direction.

Referring to the drawings in detail, in a top view of a second top fan mounting structure of a dust removing system of a urea prilling tower shown in fig. 5, in a top view direction, a top induced draft fan 1 and a filter assembly 10 are arranged around an empty space above a prilling compartment 11, and the top induced draft fan 1 and the filter assembly 10 are arranged at intervals to mount the filter assembly 10 as many as possible, so as to obtain a better filtering and dust removing effect. In the vertical direction of the tower body, a top induced draft fan 1 is arranged on the clean room, and a filtering component 10 is arranged at the position below the clean room and not overlapped with the projection of the top induced draft fan 1. The granulating room 11 is positioned at the center of the tower body, the horizontal plane of a granulating nozzle or a granule spraying or liquid spraying device arranged in the granulating room is lower than the horizontal plane of the bottom of the filtering component 10, or the horizontal plane of the granulating nozzle or the granule spraying or liquid spraying device arranged in the granulating room is slightly higher than the lowest horizontal plane of the filtering component 10, so that dust removal and filtration are better performed during granulation operation. As shown in fig. 5, the top induced draft fan 1 and the filter assembly 10 are preferably arranged in a concentric manner; more preferably, a plurality of groups of top induced draft fans and filter assemblies are arranged, wherein each group of top induced draft fans is three top induced draft fans 1 and are arranged into an inverted triangle, two rows of filter assemblies 10 are arranged adjacent to each group of top induced draft fans, and the like, so that the top induced draft fans and the filter assemblies arranged in a circular ring shape are formed. Still further, those skilled in the art can modify the number of induced draft fans or the number of rows or the number of filter assemblies at the top of each group based on the design concept of the present invention.

Fig. 6 is a schematic top view of a third top fan installation of a dedusting system for a urea prilling tower, and fig. 6 differs from the one shown in fig. 5 above in that the empty space in the central ring is provided with a filter assembly, i.e. the empty space above the original prilling compartment 11 is filled with a filter assembly. In the structure shown in fig. 6, the level at which the granulating nozzle or the granulating or spraying device provided in the granulating chamber is disposed is lower than the level at which the bottom of the filter assembly 10 is disposed, i.e., there is only such a positional relationship at which the granulating nozzle or the granulating or spraying device provided in the granulating chamber is disposed.

To sum up, the utility model adopts a mode of a plurality of top draught fans 1 to carry out distributed air induction, and compared with the prior art, reduces the influence of the whole fan load on the tower body 6; and the installation mode that the projection of the top induced draft fan is not overlapped with the projection of the filtering component is adopted for installation on the clean room, so that the installation mode that the induced draft fan avoids the filtering component 10 is adopted, the convenience of daily maintenance of the filtering component is improved, the filtering component 10 can be conveniently and directly replaced, the shutdown and overhaul time is further shortened, and the production efficiency of the urea granulation tower is greatly improved.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims.

Claims

1. A dust removal system of a urea prilling tower comprises a top draught fan (1), a clean room (3), a filtering component mounting part shell (4) and a tower body (6), and is characterized in that the clean room (3) is arranged on the filtering component mounting part shell (4), the shape of the filtering component mounting part shell (4) is matched with that of the urea prilling tower, the top draught fan (1) is arranged on the top of the urea prilling tower on the clean room (3), and the top draught fan (1) is only arranged along the peripheral edges of the upper part of the clean room of the urea prilling tower and used for providing distributed air flow; the periphery edge and the filter component mounting part shell (4) on the clean room provided with the top draught fan (1) are coaxially arranged, the diameter of the periphery edge on the clean room provided with the top draught fan (1) is larger than that of the filter component mounting part shell (4), and the vertical projection position of the top draught fan (1) is outside the vertical projection of the filter component mounting part shell (4).

2. The dust removal system of a urea prilling tower according to claim 1, wherein the top induced draft fan (1) is a variable frequency fan or an axial flow fan.

3. A urea prilling tower dust removal system as claimed in claim 1, wherein the filter assembly mounting portion casing (4) has a central diameter slightly smaller than the central diameter of the tower body.

4. The dust extraction system of a urea prilling tower according to claim 1, further comprising a blowing system (2), the blowing system (2) being arranged above the cleaning chamber.

5. The dust removal system of a urea prilling tower according to claim 1, further comprising a gas source system (5), wherein the gas source system (5) is a high pressure gas compressor, which is mounted on the top side of the tower (6) and adjacent to the filter assembly mounting housing (4).

6. The dust pelletizing system of urea prilling tower of claim 1, characterized in that, it further includes a fan bracket (7), the fan bracket (7) is installed on the side wall of the clean room top for the fixed installation of the top induced draft fan (1).

7. A dust extraction system for a urea prilling tower according to claim 1, wherein the cleaning chamber is formed with a "flange-like" structure on the filter assembly mounting housing (4), the "flange-like" structure of the cleaning chamber being supported by steel structures (8).

8. The dust removal system of a urea prilling tower according to claim 1, further comprising a bag washing system (9), wherein the bag washing system (9) is suspended from the bottom surface of the clean room for spraying, i.e. cleaning, the filter assembly from the outside of the filter assembly.

9. The utility model provides a dust pelletizing system of urea prilling tower, its characterized in that, the clean room adopts the structure with the equal diameter of filtering component installation department casing below the clean room, and top draught fan (1) and filtering component (10) all surround the vacant space above the granulation room (11) and set up, and top draught fan (1) and filtering component (10) set up the installation and projection of top draught fan (1) in vertical direction and filtering component (10) are the projection of vertical direction do not overlap each other at interval.

10. The utility model provides a dust pelletizing system of urea prilling tower, its characterized in that, the clean room adopt with the structure of the equal diameter of filter assembly installation department casing below the clean room, top draught fan (1) and filter assembly (10) set up around same center pin, top draught fan (1) and filter assembly (10) set up the installation and projection of top draught fan (1) in vertical direction and filter assembly (10) are at the non-overlapping of projection in vertical direction each other at interval.