CN210951294U - Air-water combined slag cooler air return system capable of avoiding leakage at return air pipe - Google Patents
Air-water combined slag cooler air return system capable of avoiding leakage at return air pipe Download PDFInfo
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- CN210951294U CN210951294U CN201921799163.5U CN201921799163U CN210951294U CN 210951294 U CN210951294 U CN 210951294U CN 201921799163 U CN201921799163 U CN 201921799163U CN 210951294 U CN210951294 U CN 210951294U
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Abstract
The utility model relates to an air-water combined slag cooler air return system for avoiding leakage of a return air pipe, which belongs to the technical field of slag coolers of circulating fluidized bed boilers. The technical scheme comprises a circulating fluidized bed boiler, an air-water slag cooler, a slag discharge pipe, an external bed material return pipe, an air return pipe, an isolating valve, a cooling fluidized air pipe and a cooling air box; one end of the slag discharging pipe is connected with a slag discharging port of the boiler, and the other end of the slag discharging pipe is connected with a slag inlet of the air-water slag cooler; the outlet of the cooling fluidization air pipe is connected with the lower air chamber of the air-water slag cooler; the inlet of the cooling fluidization air pipe is connected with the cooling air box; the circulating fluidized bed boiler is connected with the external bed through an external bed material return pipe; one end of the air return pipe is directly inserted into the external bed material return pipe, and the other end of the air return pipe is connected with the upper part of the air-water slag cooler; the isolating valve is installed on an air return pipe close to the external bed material return pipe. The utility model has the advantages of avoid the water-cooling wall to reveal, the maintenance volume reduces, long service life of system.
Description
Technical Field
The utility model belongs to the technical field of the cold sediment ware of circulating fluidized bed boiler, concretely relates to air-water joint cold sediment ware return air system who avoids return air duct department to reveal.
Background
The slag cooler is important equipment for ensuring the safe and efficient operation of the circulating fluidized bed boiler, and the operation effect of the slag cooler directly influences the load of the boiler and even causes the boiler to be shut down. At present, a slag cooler of a large circulating fluidized bed boiler mainly comprises a roller slag cooler and an air-water combined slag cooler. The air-water slag cooler has the advantages of low slag cooling temperature, large slag cooling amount and the like, but the running conditions of some domestic circulating fluidized bed boilers with the air-water slag cooler are not ideal at present. After the boiler slag enters the air-water-cooled slag cooler and exchanges heat with cold air, the cold air with increased temperature is changed into hot air and carries with part of fine particles, and the hot air enters the hearth through a hot air nozzle arranged near the height of a secondary air port of the boiler. The problem with this is that the water walls arranged at the hot blast outlets are often worn through by the dust carried by the return air, resulting in boiler leakage. This is one of the main reasons that the air-water cooled slag cooler cannot operate stably for a long time.
In view of the defects of the air-water combined slag cooler air return system of the existing circulating fluidized bed boiler, the development of the air-water combined slag cooler air return system which can avoid leakage at the air return pipe and can run safely and stably for a long time becomes a hot problem for research of researchers.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the shortcoming of the air-water combined slag cooler air return system of the existing circulating fluidized bed boiler, and providing an air-water combined slag cooler air return system for avoiding the leakage of an air return pipe. The system can obviously improve the operation stability of the circulating fluidized bed boiler, can prolong the operation period of the air-water slag cooler and improves the technical economy and safety.
In order to achieve the above object, the utility model adopts the following technical scheme: a wind-water combined slag cooler air return system for avoiding leakage at an air return pipe comprises a circulating fluidized bed boiler and a boiler slag discharge port arranged on the side wall of the circulating fluidized bed boiler; wherein: the device also comprises an air-water slag cooler, a slag discharge pipe, an external bed material return pipe, an air return pipe, an isolating valve, a cooling fluidized air pipe and a cooling air box; one end of the slag discharging pipe is connected with a slag discharging port of the boiler, and the other end of the slag discharging pipe is connected with a slag inlet of the air-water slag cooler; the outlet of the cooling fluidization air pipe is connected with the lower air chamber of the air-water slag cooler; the inlet of the cooling fluidization air pipe is connected with the cooling air box; the circulating fluidized bed boiler is connected with the external bed through an external bed material return pipe; one end of the air return pipe is directly inserted into the external bed material return pipe, and the other end of the air return pipe is connected with the upper part of the air-water slag cooler; the isolating valve is installed on an air return pipe close to the external bed material return pipe.
Compared with the prior art, the utility model has the advantages of it is following:
1. the hot air nozzle of the return air pipe of the air-water cooled slag cooler is arranged on the external bed return material pipeline, and a water-cooled wall does not exist at the position, so that the problem that the boiler is leaked due to the abrasion of the water-cooled wall in the prior art can be avoided.
2. The hot air nozzles of the return air pipe of the air-water-cooled slag cooler are arranged on the return material pipeline of the external bed, and the position of the hot air nozzles is reduced compared with the original position, so that the length of the return air pipe can be reduced, and the maintenance amount is reduced.
3. The system has less one-time investment in modification and is suitable for the modification of the return air pipe of the air-water slag cooler of the existing circulating fluidized bed boiler;
drawings
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
As shown in fig. 1, the air-water combined slag cooler air return system for preventing leakage at the return air pipe in the embodiment includes a circulating fluidized bed boiler 2 and a boiler slag discharge port 3 formed in a side wall of the circulating fluidized bed boiler 2; wherein: the device also comprises an air-water slag cooler 1, a slag discharge pipe 4, an external bed 5, an external bed feed back pipe 6, an air return pipe 7, an isolating valve 8, a cooling fluidized air pipe 9 and a cooling air box 10; one end of the slag discharging pipe 4 is connected with the slag discharging port 3 of the boiler, and the other end is connected with the slag inlet of the air-water slag cooler 1; the outlet of the cooling fluidization air pipe 9 is connected with the lower air chamber of the air-water slag cooler 1; the inlet of the cooling fluidization air pipe 9 is connected with a cooling air box 10; the circulating fluidized bed boiler 2 is connected with the external bed 5 through an external bed material return pipe 6; one end of the air return pipe 7 is directly inserted into the external bed material return pipe 6, and the other end of the air return pipe is connected with the upper part of the air-water slag cooler 1; the isolating valve 8 is arranged on an air return pipe 7 close to the external bed material return pipe 6.
Claims (1)
1. An air-water combined slag cooler air return system for preventing leakage at an air return pipe comprises a circulating fluidized bed boiler (2) and a boiler slag discharge port (3) arranged on the side wall of the circulating fluidized bed boiler (2); the method is characterized in that: the device also comprises an air-water slag cooler (1), a slag discharge pipe (4), an external bed (5), an external bed material return pipe (6), an air return pipe (7), an isolating valve (8), a cooling fluidized air pipe (9) and a cooling air box (10); one end of the slag discharging pipe (4) is connected with a slag discharging port (3) of the boiler, and the other end of the slag discharging pipe is connected with a slag inlet of the air-water slag cooler (1); the outlet of the cooling fluidization air pipe (9) is connected with the lower air chamber of the air-water slag cooler (1); the inlet of the cooling fluidization air pipe (9) is connected with a cooling air box (10); the circulating fluidized bed boiler (2) is connected with the external bed (5) through an external bed material return pipe (6); one end of the air return pipe (7) is directly inserted into the external bed material return pipe (6), and the other end of the air return pipe is connected with the upper part of the air-water slag cooler (1); the isolating valve (8) is arranged on an air return pipe (7) close to the external bed material return pipe (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921799163.5U CN210951294U (en) | 2019-10-24 | 2019-10-24 | Air-water combined slag cooler air return system capable of avoiding leakage at return air pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921799163.5U CN210951294U (en) | 2019-10-24 | 2019-10-24 | Air-water combined slag cooler air return system capable of avoiding leakage at return air pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210951294U true CN210951294U (en) | 2020-07-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921799163.5U Active CN210951294U (en) | 2019-10-24 | 2019-10-24 | Air-water combined slag cooler air return system capable of avoiding leakage at return air pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210951294U (en) |
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2019
- 2019-10-24 CN CN201921799163.5U patent/CN210951294U/en active Active
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