CN211462427U

CN211462427U - Filter bag with similar elliptical cross section applied to urea granulation process

Info

Publication number: CN211462427U
Application number: CN201921423695.9U
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: 2020-09-11
Anticipated expiration: 2029-08-29

Abstract

The utility model provides a be applied to oval cross-section's of class of urea granulation technology filter bag, the filter bag includes the outer bag of support frame and filter bag, the cross section of the outer bag of support frame and filter bag is the oval form of class, places the outer bag the inside of filter bag in the support frame in for prop up the outer bag of filter bag, support frame and the outer bag size looks adaptation of filter bag. The recycling device is suitable for recycling urea dust of the urea prilling tower, the occupation ratio of the filter bag in the production space is enlarged, and the production efficiency is greatly improved; the service life of the filter bag is prolonged, online maintenance is achieved, and production and operation economic indexes are improved.

Description

Filter bag with similar elliptical cross section applied to urea granulation process

Technical Field

The utility model belongs to the technical field of the industrial dust removal, concretely relates to be applied to oval cross-section-like filter bag of urea granulation technology, 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 bag-type dry dust removal technology is the mainstream research direction in the dry dust removal technology. In the technical field of environmental protection, a filter bag is a core component in a dry dedusting technology, but no report of applying the filter bag to a urea granulation process is found yet. In the research of dry granulation and dust removal by the applicant, the production environment of urea granulation not only has dry granular dust, but also has a large amount of moisture; and moreover, due to the characteristic of easy crystallization of urea, the traditional filter bag can be crystallized and blocked in a short period of time under the production environment, so that the filter bag cannot be normally used for a long time, and further frequent production has to be interrupted or the filter bag has to be overhauled or cleaned in a parking way, so that the production and operation are seriously influenced.

In addition, the cross section of the traditional filter bag is circular, when a plurality of filter bags with circular cross sections are used in parallel, a larger gap is formed between the adjacent filter bags, and urea particles are easily accumulated in the gap, so that the operation of equipment is influenced; secondly, the space ratio of effective dust removal is lower, and the improvement of the generation efficiency is hindered.

SUMMERY OF THE UTILITY MODEL

In order to improve the application of the dry dedusting technology, the applicant provides a filter bag with an oval-like cross section applied to a urea granulation process through a plurality of designs and researches, and the filter bag is suitable for recovering urea dust in a urea granulation tower. The occupation ratio of the filter bag in the production space is enlarged, and the production efficiency is greatly improved; the service life of the filter bag is prolonged, online maintenance is achieved, and production and operation economic indexes are improved.

According to the technical scheme of the utility model, a kind of oval cross-section's filter bag is provided, it includes the outer bag of support frame and filter bag, the cross section of the outer bag of support frame and filter bag is the oval form of class, places the outer bag the inside of filter bag in the support frame in for prop up the outer bag of filter bag, support frame and the outer bag size looks adaptation of filter bag. The ellipse-like shape is an ellipse shape and a runway shape containing a straight section.

The support frame main body is a rigid framework, and the support frame comprises a support opening section, a through section and a tail end section which are directly and rigidly connected in sequence; the support mouth section is hollow concentric elliptical ring structure, the cross section of the support mouth section is inverted 'concave', the inner concentric ring layer and the outer concentric ring layer are respectively connected with the upper mouth section through the sealing layer in a closed mode, the inner concentric ring layer, the outer concentric ring layer and the sealing layer form a hollow area, and the hollow area is adapted to the opening end of the outer bag of the filter bag. The straight section of the support frame comprises a straight radial rigid support keel and a transverse rigid support keel, and the transverse rigid support keel is fixed around the outer periphery or the inner periphery of the straight radial rigid support keel. The tail end section of the support frame is of an inverted cone structure, and the tail end section of the support frame is composed of rigid support keels.

The outer bag of the filter bag is a straight-through filter bag with a closed bottom end, and is preferably a dust removal cloth bag, and is further preferably an aramid or polyester dust removal cloth bag.

Furthermore, a dust thickness detection sensing unit is arranged on the filter bag and mainly comprises a warning device and a first voltage division electronic component arranged on the filter bag; the second voltage-dividing electronic component is connected with the first voltage-dividing electronic component in series and is used for matching with the first voltage-dividing electronic component to divide the voltage of a direct-current power supply connected to the second voltage-dividing electronic component; and the control module is used for detecting the voltage at two ends of the first voltage-dividing electronic component, and when the voltage is greater than a preset voltage threshold value, the control module controls the warning device to send warning information indicating that the filter bag needs to be cleaned.

Compared with the prior art, the utility model provides a class elliptical cross-section's filter bag and mounting method has following technical advantage:

the method is suitable for recovering the urea dust in the urea prilling tower. The occupation ratio of the filter bag in the production space is enlarged, and the production efficiency is greatly improved; the service life of the filter bag is prolonged, online maintenance is achieved, and production and operation economic indexes are improved.

The use of the filter bag support frame not only plays a role in supporting the outer bag of the filter bag, but also improves the effect of frequently spraying and cleaning the filter bag.

Drawings

FIG. 1 is a schematic structural view of a filter bag outer bag of a filter bag with an elliptical-like cross section according to the present invention;

FIG. 2 is an enlarged schematic view of a portion C of the filter bag of FIG. 1;

FIG. 3 is a schematic view of the filter bag outer bag of FIG. 1 taken along section A-A;

FIG. 4 is a schematic view of the groove of FIG. 2 taken along section B-B;

FIG. 5 is a second schematic view of the groove of FIG. 2 taken along section B-B;

FIG. 6 is a schematic illustration of a lower half of a support frame of a filter bag with an elliptical cross section according to the present invention;

FIG. 7 is a schematic illustration of the upper half of the support frame of the filter bag with an elliptical cross section according to the present invention;

FIG. 8 is a schematic structural view of a support frame of a filter bag with an elliptical-like cross section according to the present invention;

FIG. 9 is an enlarged schematic view of the upper section of the filter bag support frame of FIG. 8 taken along section A-A;

FIG. 10 is a schematic view of the lower section of the filter bag support frame shown in FIG. 8;

FIG. 11 is a schematic view of the filter bag outer bag assembled with the filter bag support frame;

FIG. 12 is a schematic view of a filter bag outer bag and a filter bag support frame about to be assembled together;

FIG. 13 is a front view of the filter bag outer bag assembled with the filter bag support frame.

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.

The utility model provides a kind of elliptical cross-section's filter bag, it includes the outer bag of support frame and filter bag, the cross section of the outer bag of support frame and filter bag is kind of ellipse circular, places the outer bag the inside of filter bag in the support frame in for prop up the outer bag of filter bag, support frame and the outer bag size looks adaptation of filter bag. The ellipse-like shape is an ellipse (as shown in fig. 3 and 4), a racetrack shape including straight segments (as shown in fig. 5), and the like.

The main body of the support frame is a rigid cage frame (as shown in fig. 6 and 7), and as shown in fig. 8, the support frame comprises a support opening section 1, a through section 2 and a tail end section 3 which are directly and rigidly connected in sequence; the support opening section 1 is of a hollow concentric elliptical ring-like structure, the cross section of the support opening section is in an inverted 'concave' shape (as shown in figure 9), the inner concentric ring layer 12 and the outer concentric ring layer 11 are connected in a closed mode through the sealing layer at the upper opening sections respectively, the inner concentric ring layer 12 (the keel inner ring 12), the outer concentric ring layer 11 (the keel outer ring 11) and the sealing layer 13 form a hollow area, and the hollow area 13 is adapted to the opening end of the outer bag of the filter bag. The straight section 2 of the support frame comprises a straight radial rigid support keel and a transverse rigid support keel, and the transverse rigid support keel is fixed around the outer periphery or the inner periphery of the straight radial rigid support keel. The tail end section 3 of the support frame is of an inverted cone-shaped structure, the tail end section 3 of the support frame is composed of rigid support keels, and the rigid support keels comprise upper keels 33, bottom keels 31 and middle through keels 32, and the upper keels 33 and the bottom keels 31 are fixedly connected together through the middle through keels 32. The support frame inside the filter bag is used for supporting the filter bag, preventing the filter bag from collapsing, and simultaneously facilitating the removal and redistribution of dust cakes.

As shown in fig. 11-13 and fig. 1-5, the outer bag of the filter bag is a straight-through filter bag with an open upper end and a closed bottom end, and the straight-through filter bag is preferably a dust removal bag. The upper end opening of the filter bag outer bag comprises a concave ring-shaped clamping structure, namely a bag ring, and the concave ring-shaped bag ring is a concave ring-shaped clamping structure C (bag ring) shown in figure 2. When the mounting is carried out, the flower plate 7 is clamped at the position of the concave ring-shaped bag ring C. The filter bag outer bag comprises a filter bag lower section 5. The fabric of the straight-through filter bag is made of a material which is efficient in filtering, easy in dust stripping and durable in use, and the straight-through filter bag is preferably an aramid fiber or polyester fiber dust removal cloth bag. In use, dust is attached to the outer surface of the outer bag of the filter bag. When the dust-containing gas passes through the filter bag, the dust is trapped on the outer surface of the filter bag, and the clean gas enters the interior of the filter bag through the filter material. Because the filter cloth is filtered by depending on the thickness of the whole filter layer and belongs to deep filtration, a three-dimensional loose porous structure is formed by fibers in the depth direction of the whole filter layer of the straight-through filter bag, and gradient filtration is formed from loose to compact from inside to outside, and the filter cloth has the advantages of high dirt capacity, long filter life, low pressure difference and the like.

As shown in FIG. 1, the filter bag outer bag is a straight-through oval shape, the section A-A is shown in FIG. 3, preferably an oval shape, the length of the long axis side a1 is more than the length of the short axis side b1, the shape of the clamping structure C (bag ring) of the filter bag outer bag is shown in FIG. 2, the cross section is shown in FIG. 4, and the length of the long axis side a2 is more than the length of the short axis side b 2. Further, the outer bag of the filter bag is a straight-through ellipse-like shape, the cross section of which is shown in fig. 5, the outer ring of the cross section is similar to a flattened runway, and the outer bag comprises

elliptical sections

61 and 63 and a straight section 62, the first elliptical section 61 is connected with the second elliptical section 63 through the straight section 62, and the length a3 of the long axis side is greater than the length b3 of the short axis side.

FIG. 11 is a schematic view of the filter bag outer bag assembled with the filter bag support frame; FIG. 12 is a schematic view of a filter bag outer bag and a filter bag support frame about to be assembled together; FIG. 13 is a front view of the filter bag outer bag assembled with the filter bag support frame. The card 7 is clamped in a groove 4 (clamping structure C, namely a bag ring) of the outer bag of the filter bag, the card 7 is fixed under the clamping of the groove 4, and the card 7 is used for integrally fixing the filter bag. At this time, the outer bag layer 41 of the filter bag is in contact with the card 7, and the inner bag layer 43 of the filter bag is in contact with the support frame. Application scenarios: the dust removal box body is divided into an upper layer and a lower layer by the pattern plate, the upper layer of the pattern plate is a clean room, the lower layer of the pattern plate is a dust removal recovery room, and the assembled filter bag is positioned in the dust removal recovery room; the card is provided with an opening, and the filter bag is vertically arranged at the opening.

As shown in fig. 12-13, the filter bag outer bag is inserted into the hole of the flower plate 7 lightly, and the outer bag opening of the filter bag is grasped at the same time, and the filter bag outer bag is slowly fed into the flower plate 7 until the outer bag body of the filter bag is vertical naturally; the groove-shaped spring ring (groove 4 (clamping structure C, namely bag ring)) of the outer bag of the filter bag is tightly held by two hands, the spring ring is bent to form a C shape, one side of the embedded bulged C-shaped spring ring is held by one hand, and the bulged C-shaped spring ring is fixed at the edge of the flower plate 7 by the other hand; slowly, the other side of the spring ring of the outer bag of the filter bag is stretched and opened, and the groove of the spring ring is just embedded into the inner side of the plate hole. After the filter bag outer bag is installed, the filter bag support frame is slowly placed into the filter bag outer bag, and the filter bag support frame is forbidden to fall freely, so that the flanging of the filter bag support frame is damaged. An inner concentric ring layer 12 (a keel inner ring 12) and an outer concentric ring layer 11 (a keel outer ring 11) of the filter bag support frame are embedded and sleeved on the opening of the filter bag outer bag.

The utility model discloses a filter bag is used for urea prilling tower's dust pelletizing system, urea prilling tower's dust pelletizing system mainly includes top of the tower base, filter bag and clean room, card, and the filter bag passes through clean room and top of the tower base fixed connection, and the card is installed on the top of the tower base. The clean room is usually fixedly connected to a fixed beam at the top of the urea prilling tower, and the other end of the clean room is hermetically welded with the dust remover box body. The filter bag is fixedly positioned with the dust removal box body through the pattern plate, the pattern plate divides the dust removal box body into an upper layer and a lower layer, the upper layer of the pattern plate is a cleaning chamber, and the lower layer of the pattern plate is a dust recovery chamber; the card is provided with a plurality of openings, a plurality of filter bags are respectively and vertically arranged at the openings, the lower part of the dust removal box body is provided with an opening, and the upper edge of the dust removal box body is arranged on the clean room. Still be equipped with the draught fan on the clean room, the draught fan includes air inlet and gas vent, the air inlet of draught fan passes through the pipeline and is connected with the clean room. During dust removal operation, the draught fan constantly takes the air in the clean room above the dust removal box body out, consequently forms the air current of upflow in urea prilling tower, and the air current is mingled with the dust particulate matter and is washed towards the filter bag, and the dust particulate is adsorbed by the filter bag, and clean air passes through the filter bag and gets into the clean room from the trompil department of card, and the gas vent via the draught fan is discharged. The sonic ash cleaner is preferably mounted on a rigid drum wall or beam of the urea prilling tower.

Further, a method for installing and using the filter bag with the similar elliptic section is provided, and comprises the following steps:

firstly, assembling a support frame main body, and sequentially and directly and rigidly connecting a support port section, a straight-through section and a tail end section;

secondly, forming similar elliptical holes which are arranged in an array mode on the pattern plate by using engineering machinery, wherein the similar elliptical holes are matched with the concave clamping grooves of the outer bag of the filter bag to be installed;

thirdly, clamping the outer bag of each filter bag in the elliptical hole-like holes of the pattern plate;

and fourthly, installing the support frame main body into the filter bag outer bag, and sleeving the support opening section of the support frame main body on a bag ring of the filter bag outer bag.

Furthermore, a dust thickness detection sensing unit is arranged on the filter bag and mainly comprises a warning device and a first voltage division electronic component arranged on the filter bag; the second voltage-dividing electronic component is connected with the first voltage-dividing electronic component in series and is used for matching with the first voltage-dividing electronic component to divide the voltage of a direct-current power supply connected to the second voltage-dividing electronic component; and the control module is used for detecting the voltage at the two ends of the first voltage-dividing electronic component, and when the voltage is greater than a preset voltage threshold value, the control module controls the warning device to send warning information indicating that the filter bag needs to be cleaned, so that the warning information can be referred by workers. The input end of the first voltage-dividing electronic component is connected with the first end of the first resistor, and the comparison circuit is used for judging whether the voltage at the two ends of the first resistor is greater than a preset voltage threshold value or not, and if so, generating a high-level signal; if not, generating a low level signal; and the controller is connected with the output end of the comparison circuit and is used for controlling the warning device to send warning information indicating that the filter bag needs to be cleaned after receiving the high-level signal. The comparison circuit comprises a comparator, a third resistor and a fourth resistor; the positive input end of the comparator is used as the input end of the comparison circuit, the negative input end of the comparator is respectively connected with the first end of the third resistor and the first end of the fourth resistor, the second end of the third resistor is connected with the direct-current power supply, the second end of the fourth resistor is grounded, and the output end of the comparator is used as the output end of the comparison circuit. The control module comprises a controller connected with the first end of the first resistor, and is used for comparing the voltage at the two ends of the first resistor with a preset voltage threshold value by using a software program, and controlling the warning device to send warning information indicating that the filter bag needs to be cleaned when the voltage is greater than the preset voltage threshold value.

Consider that first partial voltage electronic components can lead to self impedance increase because of the accumulation of surface dust, so this application locates first partial voltage electronic components on the filter bag to utilize the voltage at first partial voltage electronic components both ends to characterize the dust volume of accumulation on the filter bag. When the voltage at the two ends of the first voltage-dividing electronic component is greater than a certain voltage threshold value, the accumulated dust amount on the filter bag is excessive, and the control module can control the warning device to send warning information indicating that the filter bag needs to be cleaned under the condition, so that a worker is informed that the filter bag needs to be cleaned. It can be seen that the dust detection circuit of this application need not the staff and examines the filter bag regularly to the managerial efficiency of filter bag has been 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. The filter bag with the similar elliptical section applied to the urea granulation process comprises a support frame and a filter bag outer bag, wherein the cross sections of the support frame and the filter bag outer bag are similar elliptical shapes, the support frame is arranged in the filter bag outer bag and used for supporting the filter bag outer bag, and the support frame is matched with the filter bag outer bag in size; the tail end section of the support frame is of an inverted cone structure, and the tail end section of the support frame is composed of rigid support keels.

2. The filter bag of elliptical-like cross-section for use in urea granulation process according to claim 1, wherein the through section of the support frame comprises a through radial rigid support keel and a transverse rigid support keel fixed around the outer or inner periphery of the through radial rigid support keel.

3. The filter bag of elliptical-like cross-section for use in urea granulation process according to claim 1 or 2, wherein the filter bag outer bag is a straight through filter bag closed at its bottom end.

4. The filter bag with an oval-like cross section for use in urea granulation process as claimed in claim 1 or 2, wherein the outer bag of the filter bag is a dust removal bag.

5. The filter bag with an oval-like cross section applied to the urea granulation process as claimed in claim 1 or 2, wherein the outer bag of the filter bag is an aramid or polyester dust removal bag.

6. The filter bag with an oval-like cross-section for application in a urea granulation process according to claim 1 or 2, characterized in that said oval-like shape is oval or racetrack comprising straight sections.

7. The filter bag with the similar elliptic section applied to the urea granulation process as claimed in claim 1 or 2, wherein a dust thickness detection sensing unit is arranged on the filter bag, and mainly comprises a warning device and a first voltage division electronic component arranged on the filter bag; the second voltage-dividing electronic component is connected with the first voltage-dividing electronic component in series and is used for matching with the first voltage-dividing electronic component to divide the voltage of a direct-current power supply connected to the second voltage-dividing electronic component; and the control module is used for detecting the voltage at two ends of the first voltage-dividing electronic component, and when the voltage is greater than a preset voltage threshold value, the control module controls the warning device to send warning information indicating that the filter bag needs to be cleaned.