CN218173907U - Pneumatic dense-phase material conveying system - Google Patents

Abstract

The utility model belongs to the technical field of the boiler dust removal, especially, relate to a strength dense phase material conveying system. A plurality of pressurizing devices are arranged between every two adjacent material transfer bins on a conveying pipeline of the pneumatic dense-phase material conveying system at intervals, each pressurizing device comprises a pressurizing valve and an air outlet, and the air outlets extend into the conveying pipeline at a certain angle with the conveying direction of the materials. Therefore, each pressurizing device of the pneumatic dense-phase material conveying system controls the plugging condition of one section, the materials are pushed by the boosting air source to automatically flow forwards, and the pipe plugging phenomenon of the plugging point is eliminated. Therefore, the utility model discloses an improve conveying system's transport capacity, eliminate the embolism point to reduce the wearing and tearing of pipeline and forcing valve, realized the dual purpose of system's energy-conservation and system's safety and stability operation.

Description

Pneumatic dense-phase material conveying system

Technical Field

The utility model belongs to the technical field of the boiler removes dust, especially, relate to a strength dense phase material conveying system.

Background

The pneumatic ash conveying system is a tail treatment system for boiler combustion, and the safe operation of the pneumatic ash conveying system is very important for the safety of a boiler dust removal system. The coal consumption of a power plant reaches tens of thousands of tons every day, the production cost of the power plant is overhigh along with the increasing of the coal price, and in order to reduce the cost, the coal type proportioning of the burnt coal is needed, namely, the coal types with different qualities are mixed according to a certain proportion according to a certain principle before high-quality coal powder enters a hearth, so that the coal blending combustion is formed. However, when the coal type changes, the ash yield increases, so that the dust concentration at the actual inlet exceeds the originally designed ash conveying value of the boiler, the output of the pneumatic ash conveying device is insufficient, and the original pneumatic ash conveying system is always in an overload running state along with the normalization of coal blending combustion, so that the problems of ash blockage of a pipeline, abrasion of the pipeline, ash leakage and the like occur. So the ability to increase the level of blending is the first to increase the ash transport capacity.

According to the density of granules in the conveying pipeline, the pneumatic ash conveying is divided into dilute-phase ash conveying and dense-phase ash conveying, and the dilute-phase ash conveying has a solid content lower than 1-10kg/m ³ The operating gas velocity is high (about 18-30 m/s), and the conveying distance is basically within 300 m; dense phase ash conveying is carried out with the solid content of 10-30kg/m ³ Or in the conveying process with the solid-gas ratio larger than 25, the operation gas speed is low, the gas is conveyed by higher air pressure, the conveying distance reaches more than 500m, and the gas conveying device is suitable for long-distance conveying.

In order to improve the ash conveying capacity and ensure that a pipeline is not blocked, a pneumatic turbulence double-sleeve conveying system is developed in a positive pressure concentrated phase pneumatic conveying technology applied in the nineties, and the basic components of the pneumatic turbulence double-sleeve conveying system are that an auxiliary inner pipe with a smaller diameter is arranged at the upper part of a conveying pipeline, a special opening is arranged in the inner pipe at certain intervals, and a nozzle is arranged in the opening. The air and material mixture enters the double sleeve to move forwards under the action of conveying air pressure. When the material in the pipe is deposited and blocked due to large amount and low flow rate, the air flows through the auxiliary air pipe and is sprayed out at the nozzle with higher flow rate, the deposited material is disturbed and blown through, and the material is continuously conveyed forwards.

However, the pneumatic turbulent flow double-sleeve conveying system can purge the deposition materials, so that the materials cannot enter the auxiliary inner pipe through the nozzle, and in the past, the materials can form a plug in the auxiliary inner pipe to block the air flow in the auxiliary inner pipe, or the purged deposition materials can increase the friction between the materials and the conveying pipeline and the auxiliary inner pipe, so that the pipe wall is abraded, and even the auxiliary inner pipe falls off to form more serious blockage in the pipeline.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

In order to solve the above problems in the prior art, the utility model provides a strength dense phase material conveying system to solved conveying system inefficiency, the technical problem of pipeline embolism.

(II) technical scheme

In order to achieve the above object, the utility model discloses a main technical scheme include:

the utility model provides a pneumatic dense-phase material conveying system, which comprises a plurality of material receiving bins, a plurality of material transfer bins, an air source pipeline and a conveying pipeline, wherein the conveying pipeline is provided with a plurality of feed inlets;

a plurality of pressurizing devices are arranged between every two adjacent material transfer bins on the conveying pipeline at intervals, each pressurizing device comprises a pressurizing valve and an air outlet, and the air outlets extend into the conveying pipeline at a certain angle with the conveying direction of the materials.

And the boosting device is connected with the air inlet of the pressurizing device through a connecting pipe, so that a boosting air source is provided for the pressurizing device.

Furthermore, a plurality of circular blocking pieces which correspond to the plurality of pressurizing devices one by one are arranged inside the conveying pipeline, each circular blocking piece is arranged on the front side of the air outlet of the corresponding pressurizing device, the circular blocking pieces are rotatably connected with the top of the inner wall of the conveying pipeline, the circular blocking pieces swing back and forth in the conveying pipeline along a rotation axis, and the swing amplitude of the circular blocking pieces is the rotation 1/4 circumference.

Furthermore, a semicircular ring is fixed at a position, corresponding to each circular separation blade, above the inner wall of the conveying pipeline, a round hole is formed in the edge of each circular separation blade, each circular separation blade penetrates through the corresponding round hole through the corresponding semicircular ring to be rotatably connected with the top of the inner wall of the conveying pipeline, and the rotation axis is the axis of the corresponding semicircular ring.

Furthermore, a plurality of reinforcing ribs are arranged on the inner wall of the conveying pipeline at intervals along the axial direction of the conveying pipeline, and the reinforcing ribs are annular and matched with the inner wall of the conveying pipeline in shape.

Further, the pressurizing device is a pressurizing device capable of providing a pressure of 0.3MPa or less.

Further, the air source pipeline is capable of providing an air source pressure of less than or equal to 0.35 MPa.

Furthermore, a pressure reducing valve is arranged at the air inlet of the material transfer bin.

Further, a sealing assembly is arranged at the joint of the pressurizing device and the conveying pipeline.

(III) advantageous effects

The utility model has the advantages that:

the utility model provides a strength dense phase material conveying system has changed the traditional operational mode of conveying system, according to material, pipe diameter, transport distance etc. and pressure device installs additional at the interval on pipeline, the one section embolism condition of every pressure device control, and when the material reached full pipe state, the pressure valve was opened and is supplemented the boosting air supply in the pipeline, and the material receives the promotion of boosting air supply, and automatic forward flow, the stifled pipe phenomenon of this embolism point is eliminated.

Therefore, the utility model discloses an improve conveying system's transport capacity, eliminate the embolism point to adopt the mode that does not have to sweep, reduce pipeline and forcing valve's wearing and tearing, also reduce conveying system's huge dependence to air supply compressed air simultaneously, thereby realize the dual purpose of system's energy-conservation and system's safety and stability operation.

Drawings

FIG. 1 is a schematic structural diagram of a pneumatic dense-phase material conveying system;

fig. 2 is a schematic view of a connecting structure of the circular baffle plate and the conveying pipeline.

[ instruction of reference ]

1: a material receiving bin;

2: a material transfer bin; 21: a pressure reducing valve;

3: a delivery conduit; 31: a feed inlet; 32: a gas source inlet; 33: a circular baffle plate; 34: a semicircular ring;

4: a pressurizing device; 41: a pressurizing valve; 42: an air outlet;

5: a pressurized conduit.

Detailed Description

In order to better understand the above technical solution, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

As shown in fig. 1 and 2, the utility model provides a pneumatic dense-phase material conveying system, as shown in fig. 1, the pneumatic dense-phase material conveying system comprises two paths, one path is an ash path for conveying ash generated by a boiler, and the other path is a gas path for supplying gas into the conveying system. The ash road comprises a plurality of material receiving bins 1, a plurality of material transfer bins 2, an air source pipeline and a conveying pipeline 3; the material receiving bins 1 are in one-to-one correspondence with the material transfer bins 2, the outlets of the material receiving bins 1 are connected with the inlets of the material transfer bins 2, and the outlets of the material transfer bins 2 are connected with the feed inlets 31 arranged on the conveying pipeline 3 in one-to-one correspondence.

For the gas path, the outlet of the gas source pipeline is connected with the gas source inlet 32 of the conveying pipeline 3, a plurality of pressurizing devices 4 are arranged between every two adjacent material transfer chambers 2 on the conveying pipeline 3 at intervals, and meanwhile, one pressurizing pipeline 5 is arranged in parallel along the conveying pipeline 3, and the pressurizing pipeline 5 is connected with the gas inlets of all the pressurizing devices 4 through connecting pipes and is used for providing boosting gas sources for all the pressurizing devices 4. The pressurizing device 4 comprises a pressurizing valve 41 and an air outlet 42, the pressurizing valve 41 can control the opening and closing of the air outlet 42, the air outlet 42 extends into the conveying pipeline 3 at an acute angle with the material conveying direction, and the included angle direction is convenient for boosting air source assistance.

The actual installation distance of the pressurizing devices 4 can be adjusted according to different conveying materials, such as dust remover ash, coal economizer ash, limestone powder, steel sand, coal dust and other working conditions, and the distance range of the adjacent pressurizing devices 4 is about 3-5 m. It should be noted that a sealing assembly is arranged at the joint of the pressurizing device 4 and the conveying pipeline 3 to prevent the conveyed materials from leaking.

The utility model discloses a system during operation, the ash that produces from the boiler at first falls into the material and receives storehouse 1 in, receives storehouse 1 from the material again and enters into material transfer storehouse 2, enters into pipeline 3 via material transfer storehouse 2 in, enters into the terminal-ash storehouse of transport at last. Because the abrasion amount of the pipe wall is in direct proportion to the cubic power of the flow velocity of the flue gas in the pipe wall, the conveying speed of the ash is reduced when the abrasion of the ash to each inner wall in the system is reduced, and the ash discharging speed is high when the pressure is high and is slow when the pressure is low, a pressure reducing valve 21 is arranged at the air inlet of the material transfer bin 2, so that a certain constant pressure lower than the pressure of an air source is kept in the material transfer bin 2. During actual conveying, the design of the pressure in the material transfer bin 2 depends on the pressure of the air source and the required conveying amount.

Moreover, the constant pressure in the material transfer bin 2, which is lower than the air source pressure, can also cause ash to accumulate at the outlet of the material transfer bin 2, thereby increasing the ash-to-air ratio, even to an ash-to-air ratio of more than 35:1, dense-phase ash conveying is achieved, and the more the ash is carried away by the same amount of gas, the more efficient the ash is, so the material transfer bin 2 controls the ash conveying to achieve high-efficiency ash conveying.

While the ash enters the conveying pipe 3, the air source pipe inputs compressed air with the pressure less than or equal to 0.35MPa to the conveying pipe 3. At this time, the pressurizing device 4 can detect the pressure in the conveying pipeline 3, or a pressure sensor is independently arranged on the conveying pipeline 3 to detect the pressure in the conveying pipeline 3, when the material reaches a full pipe state and reaches a preset pressure fixed value of opening of the pressurizing device 4, the pressurizing valve 41 is opened, the boosting air source is supplemented into the conveying pipeline 3 through the air outlet 42, the ash is pushed by the boosting air source to automatically flow forwards, the pipe blockage phenomenon of the plugging point is eliminated, the pressure is reduced, and the pressurizing valve 41 is closed. Wherein the pressure of the boosting air source is less than or equal to 0.3MPa.

In order to achieve full pipe conveying in the conveying pipeline 3, as shown in fig. 1 and 2, a plurality of circular blocking pieces 33 corresponding to the plurality of pressurizing devices 4 one by one are arranged in the conveying pipeline 3, and each circular blocking piece 33 is arranged at the front side of the air outlet 42 of the corresponding pressurizing device 4. As shown in fig. 2, a semicircular ring 34 is fixed above the inner wall of the conveying pipeline 3 at a position corresponding to each circular baffle 33, a circular hole is formed in the edge of each circular baffle 33, the circular baffle 33 penetrates through the circular hole through the semicircular ring 34 to be rotatably connected with the top of the inner wall of the conveying pipeline 3, the circular baffle 33 swings back and forth in the conveying pipeline 3 by taking the axis of the semicircular ring 34 as a rotation axis, and the swing amplitude of the circular baffle 33 is a rotation 1/4 circumference.

When ash is conveyed, the circular baffle plate 33 is naturally vertically hung at first, the conveyed ash is low in ash gas content, the ash gas content is blocked by the circular baffle plate 33 and cannot be conveyed forwards continuously, when the ash is accumulated to a certain amount and the ash gas content is high, the pressure at the position is increased, the pressurizing valve 41 of the pressurizing device 4 is opened, the boosting gas source is output from the gas outlet 42, and the circular baffle plate 33 can be jacked up with the accumulated ash under the assistance of the pressurizing device 4, so that full-pipe conveying can be realized, and high-efficiency conveying can be realized.

In addition, the inner wall of the conveying pipeline 3 is provided with a plurality of annular reinforcing ribs 34 matched with the inner wall of the conveying pipeline 3 in shape at intervals along the axial direction, on one hand, the reinforcing ribs 34 can further reduce the speed of ash in the conveying pipeline 3 and reduce the abrasion of the ash to the conveying pipeline 3 caused by friction, and on the other hand, the conveying pipeline 3 is also reinforced, so that the conveying pipeline 3 is more wear-resistant.

Above can find out, the utility model discloses the transport distance is far away and compare the quantity that more can save air supply compressed air with the current defeated grey system of same distance.

Additionally, the utility model discloses can also make the material receive storehouse 1 and keep the low limit operation, the ash in the material receive storehouse 1 is lower grey level all the time promptly, because conveying capacity has improved, the ash in the material receive storehouse 1 can in time be carried away, and the ash can not save the high ash level. And when the high ash level even the ash load greatly exceeds the design load of the material receiving bin 1, the material receiving bin 1 can fall off, even the equipment collapses, and the electric dust collector is forced to stop the transportation and other major accidents occur.

The utility model discloses changed the traditional operational mode of conveying system, adopted the energy-conserving defeated grey mode of the high-efficient abrasionproof of low pressure. Firstly, the operating pressure of the conveying system is reduced, the traditional conveying pressure which is more than or equal to 0.55MP is reduced to 0.35MP, and the average flow velocity range of the materials in the conveying pipeline 3 is controlled to be 6-10 m/s, so that the air consumption and the abrasion of ash to each inner wall are reduced. Secondly, single-point air inlet in the traditional conveying system is changed into interval additional pressurizing devices, so that conveyed materials can be conveyed forward continuously in a relay mode. And the ash is controlled to be conveyed in the system in a full pipe manner, so that the conveying efficiency is high, the conveying efficiency is improved, and the conveying frequency of the conveying system is reduced.

The utility model discloses an improve conveying system's transport capacity, eliminate the embolism point to adopt the mode that does not have to sweep, reduce the wearing and tearing of pipeline and ooze valve, also reduce conveying system's huge dependence to air supply compressed air simultaneously, thereby realize the dual purpose of system's energy-conservation and system's safety and stability operation.

In the description of the present specification, the description of "one embodiment", "some embodiments", "examples", "specific examples" or "some examples", etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

While embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that modifications, adaptations, substitutions and variations of the above embodiments may occur to one of ordinary skill in the art without departing from the scope of the present invention.

Claims (9)

1. A pneumatic dense-phase material conveying system comprises a plurality of material receiving bins (1), a plurality of material transfer bins (2), an air source pipeline and a conveying pipeline (3), wherein a plurality of feeding holes (31) are formed in the conveying pipeline (3), the material receiving bins (1) correspond to the material transfer bins (2) one by one, the outlets of the material receiving bins (1) are connected with the inlets of the material transfer bins (2), the outlets of the material transfer bins (2) are connected with the feeding holes (31) of the conveying pipeline (3) one by one, and the outlets of the air source pipeline are connected with the air source inlet (32) of the conveying pipeline (3); the material transfer bin is characterized in that a plurality of pressurizing devices (4) are arranged between every two adjacent material transfer bins (2) on the conveying pipeline (3) at intervals, each pressurizing device (4) comprises a pressurizing valve (41) and an air outlet (42), and the air outlets (42) extend into the conveying pipeline (3) at a certain angle with the conveying direction of the materials.

2. A pneumatic dense-phase material conveying system according to claim 1, further comprising a pressurizing pipeline (5), wherein the pressurizing pipeline (5) is arranged in parallel along the conveying pipeline (3), all the pressurizing devices (4) share the pressurizing pipeline (5), and the pressurizing pipeline (5) is connected with the air inlets of the pressurizing devices (4) through connecting pipes to provide a boosting air source for the pressurizing devices (4).

3. A pneumatic dense-phase material conveying system according to claim 1, wherein a plurality of circular blocking pieces (33) corresponding to a plurality of pressurizing devices (4) one by one are arranged inside the conveying pipeline (3), each circular blocking piece (33) is arranged at the front side of the air outlet (42) of the corresponding pressurizing device (4), the circular blocking piece (33) is rotatably connected with the top of the inner wall of the conveying pipeline (3), the circular blocking piece (33) swings back and forth in the conveying pipeline (3) along a rotation axis, and the swing amplitude of the circular blocking piece (33) is 1/4 of the circumference of rotation.

4. The pneumatic dense-phase material conveying system according to claim 3, wherein a semicircular ring (34) is fixed above the inner wall of the conveying pipeline (3) at a position corresponding to each circular baffle (33), a circular hole is formed in the edge of each circular baffle (33), the circular baffle (33) penetrates through the circular hole through the semicircular ring (34) to be rotatably connected with the top of the inner wall of the conveying pipeline (3), and the rotation axis is the axis of the semicircular ring (34).

5. A pneumatic dense-phase material conveying system according to claim 1, characterized in that the inner wall of the conveying pipe (3) is provided with a plurality of reinforcing ribs (34) at intervals along the axial direction thereof, and the reinforcing ribs (34) are annular and matched with the inner wall of the conveying pipe (3) in shape.

6. Pneumatic dense-phase material conveying system according to claim 1, characterised in that the pressure device (4) is a pressure device capable of providing a pressure of less than or equal to 0.3MPa.

7. The pneumatic dense-phase material conveying system according to claim 1, wherein the air source pipeline is an air source pipeline capable of providing an air source pressure of 0.35MPa or less.

8. A pneumatic dense-phase material conveying system according to claim 1, characterized in that a pressure reducing valve (21) is arranged at the air inlet of the material transfer bin (2).

9. Pneumatic dense-phase material conveying system according to claim 1, characterized in that a sealing assembly is arranged at the connection of the pressurizing device (4) and the conveying pipe (3).

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