阅读说明：本技术 一种煤粉输送系统 (Pulverized coal conveying system ) 是由 陈力 李士强 侯伟 桑超 耿雷 欧阳新军 于 2021-06-18 设计创作，主要内容包括：本发明设计了一种煤粉输送系统,其包括输送管道,所述输送管道的两端分别设置有风机、喷头,所述输送管道的上方设置有进料斗、三通接头、第一过滤罐和第二过滤罐,所述进料斗的出口端与三通接头的第三接头连通；所述第一过滤罐的出口端和第二过滤罐的出口端均与输送管道连通,所述第一过滤罐和第二过滤罐的出口端分别设置有第一连通开关和第二连通开关；所述第一过滤罐的进口端与三通接头的第一接头连通,所述第二过滤罐的进口端与三通接头的第二接头连通,所述第一接头和第二接头上分别设置有第三连通开关和第四连通开关。本发明的有益效果在于,其在清理、更换过滤组件时可以只关闭对应的过滤罐,不需要进行整机停机处理。(The invention designs a pulverized coal conveying system which comprises a conveying pipeline, wherein a fan and a spray head are respectively arranged at two ends of the conveying pipeline, a feed hopper, a three-way joint, a first filtering tank and a second filtering tank are arranged above the conveying pipeline, and the outlet end of the feed hopper is communicated with a third joint of the three-way joint; the outlet ends of the first filtering tank and the second filtering tank are communicated with a conveying pipeline, and a first communicating switch and a second communicating switch are respectively arranged at the outlet ends of the first filtering tank and the second filtering tank; the inlet end of the first filter tank is communicated with a first joint of the three-way joint, the inlet end of the second filter tank is communicated with a second joint of the three-way joint, and a third communicating switch and a fourth communicating switch are respectively arranged on the first joint and the second joint. The invention has the advantages that when the filter assembly is cleaned and replaced, only the corresponding filter tank can be closed, and the complete machine does not need to be stopped.)

1. The pulverized coal conveying system is characterized by comprising a conveying pipeline (2), wherein one end of the conveying pipeline (2) is provided with a fan (8), the other end of the conveying pipeline (2) is provided with a spray head (1), a feed hopper (14) and a three-way joint (21) are arranged above the conveying pipeline (2), and the outlet end of the feed hopper (14) is communicated with a third joint (15) of the three-way joint (21); a first filtering tank (4) and a second filtering tank (3) are further arranged above the conveying pipeline (2), a first filtering component and a second filtering component are respectively arranged in the first filtering tank (4) and the second filtering tank (3), and sealing doors (20) are respectively arranged on the first filtering tank (4) and the second filtering tank (3); the outlet end of the first filtering tank (4) and the outlet end of the second filtering tank (3) are both communicated with the conveying pipeline (2), and the outlet ends of the first filtering tank (4) and the second filtering tank (3) are respectively provided with a first communicating switch and a second communicating switch; the inlet end of the first filtering tank (4) is communicated with a first joint (16) of a three-way joint (21), the inlet end of the second filtering tank (3) is communicated with a second joint (17) of the three-way joint (21), and a third communicating switch and a fourth communicating switch are respectively arranged on the first joint (16) and the second joint (17).

2. A pulverized coal conveying system according to claim 1, characterized in that the first filter assembly comprises a filter screen (9), the filter screen (9) is detachably mounted at the lower part of the first filter tank (4); the top of filter screen (9) is provided with pivot (11), the rotatable upper portion of installing at first filter tank (4) of pivot (11), fixed mounting has broken dish (10) in pivot (11), be provided with the tooth on broken dish (10).

3. The pulverized coal conveying system according to claim 2, wherein the first filter assembly and the second filter assembly are identical in structure.

4. The pulverized coal conveying system according to claim 1, characterized in that an inert gas tank (7) is arranged above the conveying pipeline (2), and a first gas conveying pipe (12) and a second gas conveying pipe (19) are communicated with the inert gas tank (7); the first air delivery pipe (12) is communicated with the upper end of the first filtering tank (4), and a first control valve (13) is arranged on the first air delivery pipe (12); the second air delivery pipe (19) is communicated with the upper end of the second filter tank (3), and a second control valve (18) is arranged on the second air delivery pipe (19).

5. The pulverized coal conveying system according to claim 4, characterized in that the inert gas tank (7) is further communicated with a third gas conveying pipe (5), the third gas conveying pipe (5) is communicated with the conveying pipeline (2), and the third gas conveying pipe (5) is provided with a third control valve (6).

6. The pulverized coal conveying system according to claim 5, characterized in that the first control valve (13), the second control valve (18) and the third control valve (6) are all solenoid valves.

7. The pulverized coal conveying system according to claim 6, characterized by further comprising a controller, wherein the controller is in communication connection with the first control valve (13), the second control valve (18) and the third control valve (6), and the controller can control the opening and closing of the first control valve (13), the second control valve (18) and the third control valve (6) independently.

8. The pulverized coal conveying system according to claim 7, characterized in that an oxygen concentration measuring instrument is arranged in the conveying pipeline (2), and the oxygen concentration measuring instrument is in communication connection with the controller; the controller can receive the output signal of the oxygen concentration measuring instrument and control the opening and closing of the third control valve (6) according to the output signal of the oxygen concentration measuring instrument.

9. The pulverized coal conveying system according to claim 7 or 8, characterized in that a dust concentration detector is arranged in the conveying pipeline (2), and the dust concentration detector is in communication connection with the controller; the controller can receive the output signal of the dust concentration detector and independently control the opening and closing of the first control valve (13) and the second control valve (18) according to the output signal of the dust concentration detector.

10. The pulverized coal conveying system according to claim 7, wherein the first communicating switch, the second communicating switch, the third communicating switch and the fourth communicating switch are all solenoid valves, the controller is in communication connection with the first communicating switch, the second communicating switch, the third communicating switch and the fourth communicating switch, and the controller can independently control the first communicating switch, the second communicating switch, the third communicating switch and the fourth communicating switch.

Technical Field

The invention relates to the field of pulverized coal conveying, in particular to a pulverized coal conveying system.

Background

When thermal power generation is carried out, large thermal power plants burn pulverized coal for improving coal burning efficiency. Therefore, raw coal in the coal hopper is firstly sent to a coal mill to be milled into coal powder, and the milled coal powder is carried by hot air and sent to the hearth of the boiler through a powder discharge fan to be combusted. Therefore, certain requirements are made on the particle size and the impurity content in the coal dust, and the transportation and use effects of the coal dust are greatly influenced by the oversize particles or the high impurity content in the coal dust. Most of the existing coal conveying systems directly adopt a mode of arranging a layer of filter screen in the feed hopper to filter coal powder, but the filter structure is inconvenient to clean and replace the filter screen and is easy to block. And after the filter screen is blocked, the whole machine needs to be stopped to clean or replace the filter screen, thereby seriously influencing the whole working efficiency.

Disclosure of Invention

The invention aims to provide and design a pulverized coal conveying system aiming at the defect that the whole machine needs to be stopped when a filtering structure of the pulverized coal conveying system is cleaned in the prior art so as to solve the problem, and pulverized coal conveying work can still be carried out when the filtering structure is cleaned so as to improve the pulverized coal conveying efficiency.

In order to achieve the purpose, the invention provides the following technical scheme: a pulverized coal conveying system comprises a conveying pipeline, wherein a fan is arranged at one end of the conveying pipeline, a spray head is arranged at the other end of the conveying pipeline, a feed hopper and a three-way joint are arranged above the conveying pipeline, and the outlet end of the feed hopper is communicated with a third joint of the three-way joint; a first filtering tank and a second filtering tank are further arranged above the conveying pipeline, a first filtering component and a second filtering component are respectively arranged in the first filtering tank and the second filtering tank, and sealing doors are respectively arranged on the first filtering tank and the second filtering tank; the outlet ends of the first filtering tank and the second filtering tank are communicated with a conveying pipeline, and a first communicating switch and a second communicating switch are respectively arranged at the outlet ends of the first filtering tank and the second filtering tank; the inlet end of the first filter tank is communicated with a first joint of the three-way joint, the inlet end of the second filter tank is communicated with a second joint of the three-way joint, and a third communicating switch and a fourth communicating switch are respectively arranged on the first joint and the second joint. Therefore, under normal conditions, the pulverized coal can be filtered simultaneously through the first filter tank and the second filter tank; when a corresponding filtering component in a certain filtering tank is blocked or needs to be cleaned, the corresponding communicating switch is only required to be closed, so that the corresponding filtering tank is in a closed state, and the complete machine does not need to be stopped.

In a further improvement of the invention, the first filter assembly comprises a filter screen which is detachably arranged at the lower part of the first filter tank; the top of filter screen is provided with the pivot, the rotatable upper portion of installing at first filter tank of pivot, fixed mounting has broken dish in the pivot, be provided with tooth on the broken dish. The pulverized coal falling from the feeding hopper can be further crushed by the crushing disc, and the pulverized coal crushed by the crushing disc can enter a lower conveying pipeline after being filtered by the filter screen, so that larger particles in the pulverized coal sprayed by a conveying system are avoided.

In a further development of the invention, the first filter assembly and the second filter assembly are of identical construction. No matter the buggy in the feeder hopper falls into first filtration jar or falls into the second and filters the jar like this, this system all can filter the buggy.

The invention is further improved in that an inert gas tank is arranged above the conveying pipeline, and a first gas conveying pipe and a second gas conveying pipe are communicated with the inert gas tank; the first gas pipe is communicated with the upper end of the first filtering tank, and a first control valve is arranged on the first gas pipe; the second air delivery pipe is communicated with the upper end of the second filter tank, and a second control valve is arranged on the second air delivery pipe. Therefore, the pulverized coal adsorbed on the filter screen can be blown down by inert gas in the conveying process and blown into the conveying pipeline.

The invention is further improved in that the inert gas tank is also communicated with a third gas pipe, the third gas pipe is communicated with the conveying pipeline, and the third gas pipe is provided with a third control valve. Therefore, in the process of conveying the pulverized coal, the inert gas in the inert gas tank can be used for diluting the concentration of the air in the conveying pipeline, and the pulverized coal and the air are prevented from being combined to a certain degree and then spontaneous combustion is generated.

The invention further improves the structure that the first control valve, the second control valve and the third control valve are all electromagnetic valves, so that workers can conveniently control the first control valve, the second control valve and the third control valve.

The invention further improves the structure and the method, and further comprises a controller which is in communication connection with the first control valve, the second control valve and the third control valve, wherein the controller can independently control the opening and closing of the first control valve, the second control valve and the third control valve, so that a worker can remotely control the opening and closing of the first control valve, the second control valve and the third control valve.

The invention is further improved in that an oxygen concentration measuring instrument is arranged in the conveying pipeline, and the oxygen concentration measuring instrument is in communication connection with the controller; the controller can receive the output signal of the oxygen concentration measuring instrument and control the switch of the third control valve according to the output signal of the oxygen concentration measuring instrument, so that the system can automatically control the flow speed of inert gas in the third gas transmission pipe according to the oxygen concentration in the transmission pipe, and the oxygen concentration in the transmission pipe is ensured to be always in a normal range.

The invention is further improved in that a dust concentration detector is arranged in the conveying pipeline and is in communication connection with the controller; the controller can receive the output signal of the dust concentration detector and independently control the opening and closing of the first control valve and the second control valve according to the output signal of the dust concentration detector, so that the system can automatically control the flow rate of inert gas in the first gas transmission pipe and the second gas transmission pipe according to the concentration of pulverized coal in the conveying pipeline, thereby controlling the discharge amount of pulverized coal on the first filter tank and the second filter tank, and ensuring that the concentration of the pulverized coal and the concentration of oxygen in the conveying pipeline are always within a normal range.

The invention further improves the structure that the first communicating switch, the second communicating switch, the third communicating switch and the fourth communicating switch are all electromagnetic valves, the controller is in communication connection with the first communicating switch, the second communicating switch, the third communicating switch and the fourth communicating switch, and the controller can independently control the switches of the first communicating switch, the second communicating switch, the third communicating switch and the fourth communicating switch, so that when the filter assembly needs to be cleaned and replaced, the corresponding circulating switch can be directly controlled to be closed through the controller, and the corresponding filter tank is in a closed state. At this time, the worker can directly perform cleaning and replacement of the filter assembly.

The pulverized coal conveying system has the beneficial effects that the pulverized coal conveying system is provided with two filter tanks, and each filter tank is internally provided with a group of filter components, so that when the filter components need to be cleaned and replaced, only the corresponding communication switch on the filter tank to be replaced or cleaned needs to be closed, and the whole conveying system does not need to be stopped. Thereby greatly improving the conveying efficiency of the pulverized coal. The invention can control the concentration of the coal powder and the concentration of the oxygen in the conveying pipeline by controlling the flow rate of the inert gas in the gas conveying pipe, and ensures that the coal powder and the air can be perfectly combined, so that the coal powder can be ensured to be fully combusted in the next stage, and the spontaneous combustion of the coal powder in the conveying pipeline can be avoided.

In addition, the invention has reliable design principle, simple structure and very wide application prospect.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description will be briefly introduced, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.

FIG. 1 is a schematic diagram of a specific embodiment of the present invention.

In the figure: 1. the device comprises a spray head, 2. a conveying pipeline, 3. a second filter tank, 4. a first filter tank, 5. a third gas pipe, 6. a third control valve, 7. an inert gas tank, 8. a fan, 9. a filter screen, 10. a crushing disc, 11. a rotating shaft, 12. a first gas pipe, 13. a first control valve, 14. a feed hopper, 15. a third joint, 16. a first joint, 17. a second joint, 18. a second control valve, 19. a second gas pipe, 20. a sealing door and 21. a three-way joint.

Detailed Description

In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the present embodiment, and it is apparent that the embodiments described below are only a part of embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the scope of protection of this patent.

As shown in fig. 1, the present invention provides a pulverized coal conveying system, which includes a conveying pipe 2, wherein one end of the conveying pipe 2 is provided with a fan 8, and the other end of the conveying pipe 2 is provided with a nozzle 1. A feed hopper 14 and a three-way joint 21 are arranged above the conveying pipeline 2, and the outlet end of the feed hopper 14 is communicated with a third joint 15 of the three-way joint 21. The top of pipeline 2 still is provided with first filtration jar 4 and second filtration jar 3, wherein, the exit end of first filtration jar 4 and the exit end of second filtration jar 3 all communicate with pipeline 2, still be provided with first intercommunication switch and second intercommunication switch on the exit end of first filtration jar 4 and second filtration jar 3 respectively. In addition, the inlet end of the first filter tank 4 is communicated with the first joint 16 of the three-way joint 21, the inlet end of the second filter tank 3 is communicated with the second joint 17 of the three-way joint 21, and the first joint 16 and the second joint 17 are respectively provided with a third communication switch and a fourth communication switch. And the first communication switch, the second communication switch, the third communication switch and the fourth communication switch are all preferably solenoid valves. Furthermore, in order to conveniently control the switches of the first communication switch, the second communication switch, the third communication switch and the fourth communication switch, the controller is further arranged and is in communication connection with the first communication switch, the second communication switch, the third communication switch and the fourth communication switch, and the controller can independently control the switches of the first communication switch, the second communication switch, the third communication switch and the fourth communication switch.

A first filtering component and a second filtering component are respectively arranged in the first filtering tank 4 and the second filtering tank 3, and the structures of the first filtering component and the second filtering component are the same. Taking the first filtering assembly as an example, the first filtering assembly comprises a filtering net 9, and the filtering net 9 is detachably mounted at the lower part of the first filtering tank 4. Further, in order to avoid large particle substances in the pulverized coal, a rotating shaft 11 is arranged above the filter screen 9, the rotating shaft 11 is rotatably arranged at the upper part of the first filter tank 4, a crushing disc 10 is fixedly arranged on the rotating shaft 11, and teeth are arranged on the crushing disc 10. The pulverized coal is contacted with the teeth on the crushing disc 10 by rotating the rotating shaft 11, and part of the pulverized coal is further ground. In addition, a sealing door 20 is arranged on each of the first filter tank 4 and the second filter tank 3, so that the corresponding filter assembly can be detached or cleaned by opening the sealing door 20.

In addition, in order to ensure that the concentration of the pulverized coal in the conveying pipeline 2 is matched with the concentration of the oxygen, the invention is also provided with an inert gas tank 7, and the inert gas tank 7 is preferably arranged above the conveying pipeline 2, so that the length of the pipeline is reduced. Wherein, the inert gas tank 7 is communicated with a first gas pipe 12, a second gas pipe 19 and a third gas pipe 5. The first air conveying pipe 12 is communicated with the upper end of the first filtering tank 4, and a first control valve 13 is arranged on the first air conveying pipe 12; the second air delivery pipe 19 is communicated with the upper end of the second filtering tank 3, and a second control valve 18 is arranged on the second air delivery pipe 19; the third air delivery pipe 5 is communicated with the conveying pipeline 2, and a third control valve 6 is arranged on the third air delivery pipe 5. The first control valve 13, the second control valve 18 and the third control valve 6 are preferably solenoid valves, the first control valve 13, the second control valve 18 and the third control valve 6 are also in communication connection with a controller, and the controller can control the opening and closing of the first control valve 13, the second control valve 18 and the third control valve 6 independently.

In addition, an oxygen concentration measuring instrument and a dust concentration detector are also arranged in the conveying pipeline 2, and are both in communication connection with the controller; the controller can receive the output signal of the oxygen concentration measuring instrument and control the opening and closing of the third control valve 6 according to the output signal of the oxygen concentration measuring instrument; the controller can also receive the output signal of the dust concentration detector and independently control the opening and closing of the first control valve 13 and the second control valve 18 according to the output signal of the dust concentration detector, so that the coal powder concentration and the oxygen concentration in the conveying pipeline 2 are changed.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.