Buffer feeding device for inflammable solid waste fuel

Abstract

The utility model particularly relates to a flammable solid waste fuel buffering feeding device which comprises a feeding system, an inert gas protection system, a pneumatic conveying system, a buffering bin, a discharging conveying adjusting system and a circulating fluidized bed boiler. The discharging end of the feeding system is communicated with the feeding end of the surge bin through the pneumatic conveying system, the discharging end of the surge bin is communicated with the circulating fluidized bed boiler through the discharging conveying adjusting system, and a pressure monitoring unit and a temperature monitoring unit are arranged in the surge bin. Pipelines in the feeding system and the pneumatic conveying system and the surge bin are all communicated with the inert gas protection system. Wherein the inert gas protection system is arranged to carry out inert atmosphere protection on the whole fuel conveying process, so that the spontaneous combustion risk possibly existing in the air where flammable solid waste fuel is exposed is eliminated, and continuous and uniform boiler feeding is achieved in combination with the pneumatic conveying system, the surge bin and the unloading conveying adjusting system; and safe operation of the boiler is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of boiler feeding devices, in particular to a buffer feeding device for flammable solid waste fuel. Background Art

[0002] A boiler is a device that uses fuel combustion to heat boiler feed water to produce steam with a certain temperature and pressure. The generated steam can be heated into saturated steam or superheated steam as needed. Among them, the circulating fluidized bed boiler combustion technology is a high-efficiency, low-pollution clean combustion technology that has gradually developed in recent years. It has the advantages of high combustion efficiency, wide adaptability to coal types, low concentration of harmful gas emissions in flue gas, large load adjustment range, and comprehensive utilization of ash and slag. After further technological development, the suspended combustion circulating fluidized bed boiler can process industrial solid waste with a certain calorific value, thereby effectively alleviating the environmental problems caused by industrial solid waste and realizing the comprehensive utilization of solid waste.

[0003] At present, the conventional suspended combustion circulating fluidized bed boiler fuel feeding system is to send solid fuel to the fuel bin through the feeding system, and then send it to the boiler furnace by the feeder to burn and heat the boiler water. However, among the common solid waste fuels, there is a kind of dust ash that is easy to self-ignite. It cannot be transported in the open air like conventional coal fuel. It needs to be transported under the protection of inert gas to ensure normal transportation and boiler feeding. But how to send it into the boiler and ensure the safe combustion and operation of the boiler is the primary problem that needs to be overcome and solved. Summary of the invention

[0004] In order to overcome the shortcomings and deficiencies in the prior art, the utility model aims to provide a buffer feeding device for flammable solid waste fuel.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A buffer feeding device for flammable solid waste fuel comprises a feeding system, an inert gas protection system, a pneumatic conveying system, a buffer bin, a discharge conveying and regulating system and a circulating fluidized bed boiler. The discharge end of the feeding system is connected to the feed end of the buffer bin via the pneumatic conveying system. The discharge ends of the buffer bin are both connected to the circulating fluidized bed boiler via the discharge conveying and regulating system. A pressure monitoring unit and a temperature monitoring unit are arranged in the buffer bin. The feeding system, the pipelines in the pneumatic conveying system and the buffer bin are all connected to the inert gas protection system.

[0007] Furthermore, the feeding system includes a feeding bin, the inlet end of which is connected to a feed pipe, and the bottom of the feeding bin is connected to a discharge branch pipe; the feeding bin is respectively provided with a beating device, a level meter for detecting the material amount, and a first pressure gauge for detecting the pressure in the feeding bin.

[0008] Furthermore, the pneumatic conveying system includes a first conveying pipe and a venturi accelerator, one end of the first conveying pipe is connected to the outlet end of the feeding system, and the other end of the first conveying pipe is connected to the first end of the venturi accelerator.

[0009] Furthermore, the first conveying pipe is provided with a first gate valve and a discharge valve in sequence from one end close to the feeding system to the other end.

[0010] Furthermore, the pneumatic conveying system also includes a fan and a second conveying pipe, the wind output end of the fan is connected to the second end of the Venturi accelerator, one end of the second conveying pipe is connected to the third section of the Venturi accelerator, and the other end of the second conveying pipe is connected to the buffer bin.

[0011] Furthermore, the inert gas protection system includes an inert gas source main pipe, a first inert gas pipe and a second inert gas pipe, the inert gas source main pipe is connected to an external inert gas source device, the two ends of the first inert gas pipe are respectively connected to the inert gas source main pipe and the loading bin, and the two ends of the second inert gas pipe are respectively connected to the inert gas source main pipe and the second conveying pipe.

[0012] Furthermore, the pneumatic conveying system also includes a buffer bin isolation valve and a distributor. The buffer bin isolation valve is arranged at one end of the second conveying pipe close to the buffer bin. The end of the second conveying pipe close to the buffer bin is connected to the distributor. The outlet end of the distributor is respectively connected to the two buffer bins through pipelines.

[0013] Furthermore, the unloading, conveying and adjusting system includes a first unloading pipe, a screw feeder and a second unloading pipe, one end of the first unloading pipe is connected to the discharge end of the buffer bin, the other end of the first unloading pipe is connected to the feed pipe of the screw feeder, and the discharge end of the screw feeder is connected to the circulating fluidized bed boiler via the second unloading pipe.

[0014] Furthermore, the first discharge pipe is provided with a second gate valve, an air lock and a second pressure gauge in sequence from one end close to the buffer bin to the other end.

[0015] Furthermore, an air separator is provided between the buffer bin and the circulating fluidized bed, and an inlet end of the air separator is connected to the gas pipeline of the circulating fluidized bed boiler.

[0016] The beneficial effect of the utility model is that the utility model discloses a buffer feeding device for flammable solid waste fuel, which provides inert atmosphere protection for the entire process of fuel transportation through the setting of an inert gas protection system, thereby eliminating the risk of spontaneous combustion of flammable solid waste fuel exposed to the air, and combines the setting of a pneumatic conveying system, a buffer bin and a unloading conveying and regulating system to achieve continuous and uniform boiler feeding, thereby ensuring the safe operation of the boiler. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the inflammable solid waste fuel buffer feeding device of the utility model.

[0018] The accompanying drawings are marked as follows: 1. buffer bin; 2. circulating fluidized bed boiler; 3. pressure monitoring unit; 4. temperature monitoring unit; 5. loading bin; 6. feed pipe; 7. discharge branch pipe; 8. beating device; 9. level meter; 10. first pressure gauge; 11. first conveying pipe; 12. Venturi acceleration device; 13. first gate valve; 14. discharge valve; 15. fan; 16. second conveying pipe; 17. first inert gas pipe; 18. second inert gas pipe; 19. buffer bin isolation valve; 20. distributor; 21. first discharge pipe; 22. screw feeder; 23. second discharge pipe; 24. second gate valve; 25. air lock; 26. second pressure gauge; 27. air separator; 28. pressure relief valve. DETAILED DESCRIPTION

[0019] In order to facilitate the understanding of those skilled in the art, the present invention is further described below in conjunction with embodiments and drawings. The contents mentioned in the implementation modes are not intended to limit the present invention.

[0020] Example 1

[0021] like Figure 1 As shown, this embodiment provides a buffer feeding device for flammable solid waste fuel, including a feeding system, an inert gas protection system, a pneumatic conveying system, a buffer bin 1, a discharge conveying and regulating system and a circulating fluidized bed boiler 2. The discharge end of the feeding system is connected to the feed end of the buffer bin 1 via the pneumatic conveying system, and the discharge end of the buffer bin 1 is connected to the circulating fluidized bed boiler 2 by the discharge conveying and regulating system. A pressure monitoring unit 3 and a temperature monitoring unit 4 are provided in the buffer bin 1, and the feeding system, the pipelines in the pneumatic conveying system and the buffer bin 1 are all connected to the inert gas protection system.

[0022] In this embodiment, the flammable solid waste fuel buffer feeding device provides inert atmosphere protection for the entire fuel transportation process through the setting of an inert gas protection system, thereby eliminating the risk of spontaneous combustion of the flammable solid waste fuel exposed to the air, and combines the setting of the pneumatic conveying system, the buffer bin 1 and the unloading conveying and regulating system to achieve continuous and uniform boiler feeding, thereby ensuring the safe operation of the boiler.

[0023] Furthermore, the feeding system includes a feeding bin 5, the inlet end of the feeding bin 5 is connected to a feeding pipe 6, and the bottom of the feeding bin 5 is connected to a discharge branch pipe 7; the feeding bin 5 is provided with a beating device 8, a level meter 9 for detecting the amount of material, and a first pressure gauge 10 for detecting the pressure in the feeding bin 5. Specifically, the flammable solid waste fuel enters the feeding bin 5 through the feeding pipe 6, and the fuel is crushed and mixed by the beating device 8 in the feeding bin 5. The level gauge 9 is divided into a low level gauge 9 and a high level gauge 9. The continuity of the feeding is ensured by monitoring the amount of fuel in the feeding bin 5, and the first pressure gauge 10 is provided to detect the pressure in the feeding bin 5.

[0024] Furthermore, the pneumatic conveying system includes a first conveying pipe 11 and a venturi accelerator 12 , wherein one end of the first conveying pipe 11 is connected to the outlet end of the feeding system, and the other end of the first conveying pipe 11 is connected to the first end of the venturi accelerator 12 .

[0025] Furthermore, the first conveying pipe 11 is provided with a first gate valve 13 and a discharge valve 14 in sequence from one end close to the feeding system to the other end.

[0026] Furthermore, the pneumatic conveying system also includes a fan 15 and a second conveying pipe 16, the wind output end of the fan 15 is connected to the second end of the Venturi accelerator 12, one end of the second conveying pipe 16 is connected to the third section of the Venturi accelerator 12, and the other end of the second conveying pipe 16 is connected to the buffer bin 1.

[0027] In this embodiment, the fan 15 is preferably a Roots blower 15, and a regulating valve for controlling the air volume and flow rate is provided on the wind output end pipe of the fan 15. The fuel reaches the Venturi acceleration device 12 via the first delivery pipe 11 in turn, and under the action of the fan 15, it passes through the second delivery pipe 16 and the buffer bin 1 isolation valve, and then enters the buffer bin 1 through the distributor 20. The setting of the buffer bin 1 here can play the role of fuel transfer cache.

[0028] Furthermore, the inert gas protection system includes an inert gas source main pipe, a first inert gas pipe 17 and a second inert gas pipe 18. The inert gas source main pipe is connected to an external inert gas source device, the two ends of the first inert gas pipe 17 are respectively connected to the inert gas source main pipe and the upper bin 5, and the two ends of the second inert gas pipe 18 are respectively connected to the inert gas source main pipe and the second conveying pipe 16. Specifically, the inert gas is conveyed to the upper bin 5 through the first inert gas pipe 17, and the inert gas is brought into the pneumatic conveying system and the buffer bin 1 through the second inert gas pipe 18. The air in the device is removed under the protective effect of the inert gas to prevent the flammable fuel from being exposed to the air and spontaneously igniting.

[0029] In this embodiment, before starting the pneumatic conveying system, it is first necessary to confirm that the isolation valve of the buffer bin 1 is in the fully open state, and then start the fan 15, and purge the first conveying pipe 11, the Venturi accelerator 12, the fan 15 and the second conveying pipe 16 for 3-5 minutes. After confirming that the pipeline is unobstructed, open the discharge valve 14 on the first conveying pipe 11 for unloading, and transport the fuel to the buffer bin 1 through the pneumatic conveying system and the inert gas protection system.

[0030] Furthermore, the pneumatic conveying system further includes an isolation valve of the buffer bin 1 and a distributor 20. The isolation valve of the buffer bin 1 is arranged at one end of the second conveying pipe 16 close to the buffer bin 1. The end of the second conveying pipe 16 close to the buffer bin 1 is connected with the distributor 20. The outlet end of the distributor 20 is respectively connected to the two buffer bins 1 through pipelines. Specifically, a pressure relief valve 28 is arranged on the top of the buffer bin 1. When the pressure value in the buffer bin 1 exceeds the set value, the pressure relief valve 28 opens and releases the pressure to ensure the normal operation of the device.

[0031] Furthermore, the unloading, conveying and adjusting system includes a first unloading pipe 21, a screw feeder 22 and a second unloading pipe 23, one end of the first unloading pipe 21 is connected to the discharge end of the buffer bin 1, the other end of the first unloading pipe 21 is connected to the feed pipe 6 of the screw feeder 22, and the discharge end of the screw feeder 22 is connected to the circulating fluidized bed boiler 2 via the second unloading pipe 23.

[0032] Furthermore, the first discharge pipe 21 is provided with a second gate valve 24, an air lock 25 and a second pressure gauge 26 in sequence from one end close to the buffer bin 1 to the other end.

[0033] By setting up the buffer bin 1 and the unloading conveying regulating system, on the one hand, the fuel before entering the circulating fluidized bed boiler 2 can be transferred and buffered, and then the unloading conveying regulating system can adjust the fuel feed amount in time according to the operating load of the circulating fluidized bed boiler 2, and the operation is flexible.

[0034] Furthermore, an air separator 27 is provided between the buffer bin 1 and the circulating fluidized bed, and an inlet end of the air separator 27 is connected to the gas pipeline of the circulating fluidized bed boiler 2 .

[0035] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the present invention is within the protection scope of the present invention.

Claims

1. A buffer feeding device for flammable solid waste fuel, characterized in that: The invention comprises a feeding system, an inert gas protection system, a pneumatic conveying system, a buffer bin (1), a discharge conveying and regulating system and a circulating fluidized bed boiler (2); the discharge end of the feeding system is connected to the feed end of the buffer bin (1) via the pneumatic conveying system; the discharge end of the buffer bin (1) is connected to the circulating fluidized bed boiler (2) via the discharge conveying and regulating system; a pressure monitoring unit (3) and a temperature monitoring unit (4) are arranged in the buffer bin (1); the feeding system, the pipelines in the pneumatic conveying system and the buffer bin (1) are all connected to the inert gas protection system.

2. The inflammable solid waste fuel buffer feeding device according to claim 1, characterized in that: The feeding system comprises a feeding bin (5), the inlet end of the feeding bin (5) is connected to a feeding pipe (6), and the bottom of the feeding bin (5) is connected to a discharge branch pipe (7); a whipping device (8), a material level meter (9) for detecting the material amount, and a first pressure gauge (10) for detecting the pressure in the feeding bin (5) are respectively arranged in the feeding bin (5).

3. The inflammable solid waste fuel buffer feeding device according to claim 1, characterized in that: The pneumatic conveying system comprises a first conveying pipe (11) and a Venturi accelerator (12), wherein one end of the first conveying pipe (11) is connected to the outlet end of the feeding system, and the other end of the first conveying pipe (11) is connected to the first end of the Venturi accelerator (12).

4. The inflammable solid waste fuel buffer feeding device according to claim 3, characterized in that: The first conveying pipe (11) is provided with a first gate valve (13) and a discharge valve (14) in sequence from one end close to the feeding system to the other end.

5. The inflammable solid waste fuel buffer feeding device according to claim 4, characterized in that: The pneumatic conveying system further comprises a fan (15) and a second conveying pipe (16), wherein the wind output end of the fan (15) is connected to the second end of the Venturi accelerator (12), one end of the second conveying pipe (16) is connected to the third section of the Venturi accelerator (12), and the other end of the second conveying pipe (16) is connected to the buffer bin (1).

6. The inflammable solid waste fuel buffer feeding device according to claim 5, characterized in that: The inert gas protection system comprises an inert gas source main pipe, a first inert gas pipe (17) and a second inert gas pipe (18); the inert gas source main pipe is connected to an external inert gas source device; two ends of the first inert gas pipe (17) are respectively connected to the inert gas source main pipe and a loading bin (5); and two ends of the second inert gas pipe (18) are respectively connected to the inert gas source main pipe and a second delivery pipe (16).

7. The inflammable solid waste fuel buffer feeding device according to claim 6, characterized in that: The pneumatic conveying system further comprises a buffer bin (1) isolation valve and a distributor (20); the buffer bin (1) isolation valve is arranged at one end of the second conveying pipe (16) close to the buffer bin (1); the end of the second conveying pipe (16) close to the buffer bin (1) is connected to the distributor (20); the outlet end of the distributor (20) is connected to the two buffer bins (1) respectively through pipelines.

8. The inflammable solid waste fuel buffer feeding device according to claim 1, characterized in that: The unloading, conveying and regulating system comprises a first unloading pipe (21), a screw feeder (22) and a second unloading pipe (23), wherein one end of the first unloading pipe (21) is connected to the discharge end of the buffer bin (1), and the other end of the first unloading pipe (21) is connected to the feed pipe (6) of the screw feeder (22), and the discharge end of the screw feeder (22) is connected to the circulating fluidized bed boiler (2) via the second unloading pipe (23).

9. The inflammable solid waste fuel buffer feeding device according to claim 8, characterized in that: The first discharge pipe (21) is provided with a second gate valve (24), an air lock (25) and a second pressure gauge (26) in sequence from one end close to the buffer bin (1) to the other end.

10. The inflammable solid waste fuel buffer feeding device according to claim 1, characterized in that: An air separator (27) is provided between the buffer bin (1) and the circulating fluidized bed, and an inlet end of the air separator (27) is connected to the gas pipeline of the circulating fluidized bed boiler (2).

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