Continuous bin type pneumatic conveying pump

Abstract

The invention discloses a continuous bin type pneumatic conveying pump, which relates to the technical field of pneumatic conveying, and comprises a material storage unit comprising a material bin, a crushing assembly arranged in the inner cavity of the material bin, and a circulating cylinder arranged in the center of the crushing assembly; the screw rod comprises a rotating shaft, a screw blade arranged on the outer wall of the rotating shaft, a plurality of material distribution holes formed in the surface of the screw blade and a limiting piece arranged on the outer wall of the lower end of the rotating shaft. The pulverized coal screening device has the beneficial effects that fine pulverized coal suitable for fluidization can be screened out, wet and caked pulverized coal balls which can cause blockage in the conveying process are circularly dried, and the pulverized coal balls are crushed in the circulating process. Moreover, under the condition that pulverized coal particles are not caked, the feeding efficiency is not influenced, and if impurities are mixed in the pulverized coal, the impurities can be filtered, and the discharge port, the gasification chamber and the conveying pipe are prevented from being blocked.

Description

Technical Field

[0001] The invention relates to the technical field of pneumatic conveying, in particular to a continuous bin type pneumatic conveying pump. Background Art

[0002] The continuous silo pneumatic conveying pump is a key equipment in the coal powder conveying system of thermal power plants and cogeneration power plants. It is mainly used to convey the coal powder ground by the coal mill to the boiler burner. The continuous silo pneumatic conveying pump in the prior art is usually composed of a storage silo, a feeding device, a gasification silo and a conveying pipeline, etc., and conveys the coal powder to the destination through compressed air. During the operation of the thermal power unit, the stability of the coal powder conveying directly affects the combustion efficiency of the boiler and the power generation capacity of the unit.

[0003] In the process of conveying coal powder by continuous bin pneumatic conveying pump, coal powder itself has strong hygroscopicity and is easily affected by environmental humidity. When the air humidity is high, coal powder will absorb moisture in the air, resulting in adhesion between particles and forming agglomerates of varying sizes. These agglomerates will not only reduce the conveying efficiency, but also cause blockage of the conveying pipeline and gasification bin. Especially at the entrance of the gasification bin, due to the large pressure change, the agglomeration phenomenon is more serious. Once blockage occurs, it is necessary to shut down the equipment for processing, which not only increases the maintenance cost of the equipment, but also affects the continuity of production. In addition, agglomeration will also lead to uneven conveying and affect the normal operation of downstream equipment. Summary of the invention

[0004] In view of the above problems or problems existing in the prior art, the present invention is proposed.

[0005] Therefore, an object of the present invention is to provide a continuous bin type pneumatic conveying pump which can solve the problems mentioned in the background art.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a continuous bin type pneumatic conveying pump, comprising a material storage unit, including a bin, a crushing assembly arranged in the inner cavity of the bin, and a circulation cylinder arranged in the center of the crushing assembly; The spiral rod comprises a rotating shaft, a spiral blade arranged on the outer wall of the rotating shaft, a plurality of material distribution holes arranged on the surface of the spiral blade, and a limiting plate arranged on the outer wall of the lower end of the rotating shaft; The fluidization unit comprises a gasification bin and a conveying pipe which is arranged through both sides of the outer wall of the gasification bin.

[0007] As a preferred solution of the continuous silo type pneumatic conveying pump of the present invention, the silo includes a feed port arranged at the top thereof, a discharge port arranged at the bottom of the silo, and a connecting pipe arranged around the feed port.

[0008] As a preferred solution of the continuous bin type pneumatic conveying pump of the present invention, the connecting pipe is connected to the inner cavity of the bin.

[0009] As a preferred solution of the continuous bin type pneumatic conveying pump of the present invention, the crushing assembly includes a plurality of support rods arranged on the inner wall of the bin, and a plurality of blocking bars connecting the support rods.

[0010] As a preferred solution of the continuous bin type pneumatic conveying pump of the present invention, wherein: the gasification bin includes a limiting groove arranged at the bottom thereof; the gasification bin opening is fixedly connected to the discharge port.

[0011] As a preferred solution of the continuous bin type pneumatic conveying pump of the present invention, the two conveying pipes are both connected to the inner cavity of the gasification bin.

[0012] As a preferred solution of the continuous bin type pneumatic conveying pump of the present invention, wherein: the rotating shaft passes through the bottom of the gasification bin; the rotating shaft is connected to the motor.

[0013] As a preferred solution of the continuous bin type pneumatic conveying pump of the present invention, wherein: the bottom of the circulation cylinder is not connected to the discharge port; and the spiral blades extend to the inside of the discharge port.

[0014] The beneficial effects of the present invention are as follows: the present invention can screen out coal powder particles suitable for fluidization, and circulate and dry the wet and agglomerated coal powder agglomerates that may cause blockage in the conveying process, and crush them in the circulation process until the coal powder particles meet the conveying conditions. Moreover, in the case where the coal powder particles are not agglomerated, the feeding efficiency will not be affected. If there are foreign objects mixed in the coal powder, they can also be filtered to prevent the discharge port, the gasification chamber and the conveying pipe from being blocked. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 It is an overall three-dimensional view of the present invention.

[0017] Figure 2 It is an overall partial cross-sectional view of the present invention.

[0018] Figure 3 It is an overall half-section view of the present invention.

[0019] In the figure: 100, storage unit; 101, silo; 102, crushing assembly; 103, circulation cylinder; 200, screw rod; 201, rotating shaft; 202, spiral blade; 203, material distribution hole; 204, limiting plate; 300, fluidizing unit; 301, gasification silo; 302, conveying pipe; 101a, feed port; 101b, discharge port; 101c, connecting pipe; 102a, support rod; 102b, blocking bar; 301a, limiting groove. DETAILED DESCRIPTION

[0020] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0021] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0022] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

[0023] Example 1 Reference Figure 1 to Figure 3 , which is the first embodiment of the present invention, and provides a continuous bin type pneumatic conveying pump, which includes a material storage unit 100, including a bin 101, a crushing assembly 102 disposed in the inner cavity of the bin 101, and a circulation cylinder 103 disposed in the center of the crushing assembly 102; The spiral rod 200 includes a rotating shaft 201, a spiral blade 202 disposed on the outer wall of the rotating shaft 201, a plurality of material distribution holes 203 disposed on the surface of the spiral blade 202, and a limiting piece 204 disposed on the outer wall of the lower end of the rotating shaft 201; The fluidizing unit 300 includes a gasification chamber 301 and a conveying pipe 302 penetrating through both sides of the outer wall of the gasification chamber 301 .

[0024] Furthermore, the silo 101 includes a feed port 101a disposed at the top thereof, a discharge port 101b disposed at the bottom of the silo 101, and a connecting pipe 101c disposed around the feed port 101a.

[0025] Furthermore, the connecting pipe 101c is connected to the inner cavity of the silo 101 .

[0026] Furthermore, the crushing assembly 102 includes a plurality of support rods 102a disposed on the inner wall of the silo 101, and a plurality of blocking bars 102b connecting the support rods 102a.

[0027] Furthermore, the gasification bin 301 includes a limiting groove 301a arranged at the bottom thereof; the opening of the gasification bin 301 is fixedly connected to the discharge port 101b.

[0028] Furthermore, the two delivery pipes 302 are both connected to the inner cavity of the gasification bin 301 .

[0029] Furthermore, the rotating shaft 201 passes through the bottom of the gasification bin 301; the rotating shaft 201 is connected to the motor.

[0030] Furthermore, the bottom of the circulation drum 103 is not connected to the discharge port 101b; the spiral blades 202 extend to the inside of the discharge port 101b.

[0031] It should be noted that the silo 101 is cylindrical, with a columnar upper part and a conical lower part. The silo 101 is in a closed state as a whole. A feed port 101a is provided at the top of the silo 101, through which pulverized coal can be transported to the silo 101, and a discharge port 101b is provided at the bottom of the silo 101, through which pulverized coal can be transported into the gasification silo 301.

[0032] Preferably, a heating resistor can be fixed on the outer wall of the silo 101 to heat the coal inside the silo 101. The moisture in the coal will form water vapor after heating and overflow through the connecting pipe 101c. The connecting pipe 101c is fixed to the bottom of the silo 101 and the two are connected.

[0033] Preferably, in order to prevent the coal powder from overflowing with the water vapor, a labyrinth exhaust hood needs to be installed at the connecting end of the connecting pipe 101c, and a dust filter is installed therein.

[0034] Preferably, a pressure balancing valve may be installed at the connection end of the connecting pipe 101c to maintain an appropriate positive pressure in the system, and to balance the exhaust demand and the system pressure by adjusting the valve opening.

[0035] Preferably, support rods 102a evenly distributed circumferentially are fixed to the inner wall of the silo 101, and a vertical circulation drum 103 is fixed at the center of the support rods 102a. The bottom of the circulation drum 103 does not contact the discharge port 101b, so the coal powder inside the silo 101 will gather toward the discharge port 101b.

[0036] Blocking bars 102b are also installed between the support rods 102a, and the blocking bars 102b need to be arranged relatively densely.

[0037] Preferably, the screw rod 200 is arranged inside the circulation barrel 103, and its rotating shaft 201 completely penetrates the bottom of the gasification bin 301 and extends outward, so that the reducer and the motor can be connected to each other and a transmission relationship can be established, so that the screw rod 200 can rotate inside the circulation barrel 103. The outer edge of the spiral blade 202 fixed on the outer wall of the rotating shaft 201 is close to the inner wall of the circulation barrel 103. In order to prevent the screw rod 200 from dislocating, a limiting plate 204 is fixed on the outer wall of the lower end of the rotating shaft 201, which can cooperate with the limiting groove 301a opened at the bottom of the gasification bin 301, so that the screw rod 200 can rotate but cannot move axially.

[0038] Preferably, the bottom of the spiral blade 202 needs to extend into the discharge port 101b, so that when the coal powder gathers toward the discharge port 101b, it can directly reach the surface of the spiral blade 202. The surface of the spiral blade 202 is also provided with a plurality of through-holes 203, and the size of the holes 203 depends on the degree of coal powder agglomeration, so as not to hinder the fluidized transportation process and not to cause blockage.

[0039] Preferably, the fixed delivery pipes 302 on both sides of the gasification bin 301 are interconnected, and high-pressure air enters the gasification bin 301 from one side and mixes with the coal powder to form a gas-solid two-phase flow, and is then delivered to the destination from the other side.

[0040] When the coal powder particles are dispersed and not agglomerated, they will fall directly into the gasification bin 301 from the distribution holes 203 at the discharge port 101b. As the screw rod 200 rotates, the coal powder accumulated at the bottom of the bin 101 will be stirred and continuously enter the gasification bin 301, ensuring the efficiency of coal powder transportation.

[0041] When the coal powder particles are agglomerated, they cannot fall from the distribution hole 203 and are continuously transported upward by the screw rod 200. If the coal powder agglomerates break during this process, the coal powder particles will continue to fall from the distribution hole 203 until they reach the gasification bin 301. If they are still in agglomerates, they will be transported to the top of the circulation cylinder 103 and then thrown around. The agglomerated coal powder will hit the dense blocking bars 102b or support rods 102a and then be broken, so that they can reach the distribution hole 203. If they are still in agglomerates, the above process is repeated.

[0042] When foreign objects appear, the circulation process of the spiral rod 200 can also continuously remove them from the discharge port 101b to prevent the discharge port 101b from being blocked.

[0043] In addition, the silo 101 is continuously heated to heat the coal powder, thereby accelerating the evaporation of water in the coal powder or coal powder agglomerates while the coal powder or coal powder agglomerates are being scattered, and the coal powder or coal powder agglomerates can be heated evenly during the entire circulation process.

[0044] In summary, the present invention can screen out coal powder particles suitable for fluidization, and circulate and dry the wet and agglomerated coal powder agglomerates that will cause blockage in the conveying process, and crush them in the circulation process until the coal powder particles meet the conveying conditions. Moreover, if the coal powder particles are not agglomerated, the feeding efficiency will not be affected. If there are foreign objects mixed in the coal powder, they can also be filtered to prevent the discharge port, gasification chamber and conveying pipe from being blocked.

[0045] It is important to note that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A continuous bin type pneumatic conveying pump, characterized in that: include, A material storage unit (100) comprises a material bin (101), a crushing assembly (102) arranged in the inner cavity of the material bin (101), and a circulation cylinder (103) arranged in the center of the crushing assembly (102); The spiral rod (200) comprises a rotating shaft (201), a spiral blade (202) arranged on the outer wall of the rotating shaft (201), a plurality of material distribution holes (203) arranged on the surface of the spiral blade (202), and a limiting plate (204) arranged on the outer wall of the lower end of the rotating shaft (201); The fluidizing unit (300) comprises a gasification bin (301) and a conveying pipe (302) penetrating through two sides of the outer wall of the gasification bin (301).

2. The continuous bin type pneumatic conveying pump according to claim 1, characterized in that: The silo (101) comprises a material inlet (101a) arranged at the top thereof, a material outlet (101b) arranged at the bottom of the silo (101), and a connecting pipe (101c) arranged around the material inlet (101a).

3. The continuous bin type pneumatic conveying pump according to claim 2, characterized in that: The connecting pipe (101c) is connected to the inner cavity of the silo (101).

4. The continuous bin type pneumatic conveying pump according to claim 3, characterized in that: The crushing assembly (102) comprises a plurality of support rods (102a) arranged on the inner wall of the silo (101), and a plurality of blocking bars (102b) connecting the support rods (102a).

5. The continuous bin type pneumatic conveying pump according to claim 4, characterized in that: The gasification bin (301) comprises a limiting groove (301a) arranged at the bottom thereof; the opening of the gasification bin (301) is fixedly connected to the discharge port (101b).

6. The continuous bin type pneumatic conveying pump according to claim 5, characterized in that: The two delivery pipes (302) are both in communication with the inner cavity of the gasification bin (301).

7. The continuous bin type pneumatic conveying pump according to claim 6, characterized in that: The rotating shaft (201) passes through the bottom of the gasification bin (301); the rotating shaft (201) is connected to a motor; and the bin (101) is capable of being heated and conducting heat.

8. The continuous bin type pneumatic conveying pump according to claim 7, characterized in that: The bottom of the circulation cylinder (103) is not connected to the discharge port (101b); and the spiral blade (202) extends to the inside of the discharge port (101b).

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