CN214064965U

CN214064965U - Middle storage type fly ash conveying system for boiler mixed burning

Info

Publication number: CN214064965U
Application number: CN202022978220.5U
Authority: CN
Inventors: 李仁�; 陈赢展; 张广文; 张方炜; 谈琪英; 彭红文
Original assignee: North China Power Engineering Co Ltd of China Power Engineering Consulting Group
Current assignee: North China Power Engineering Co Ltd of China Power Engineering Consulting Group; North China Power Engineering Beijing Co Ltd
Priority date: 2020-12-09
Filing date: 2020-12-09
Publication date: 2021-08-27
Anticipated expiration: 2030-12-09

Abstract

The utility model relates to a well storage formula flying dust conveying system for boiler mixes fever, warehouse in the flying dust is add between the bunker, warehouse and bunker are located feeder operation layer top equally in the flying dust, the bottom of warehouse is branch ash bucket in the flying dust, branch ash bucket below sets up the operation platform with feeder operation layer UNICOM, the warehouse passes through pipeline and upper reaches ash storehouse intercommunication in the flying dust, branch ash bucket bottom export communicates on sending grey tuber pipe, this send the export of grey wind pipeline to communicate in coal pulverizer or CFB furnace, utilize wind as sending grey wind, the utility model discloses set up a surge bin between ash storehouse and boiler, warehouse in the flying dust is arranged to the close coal bunker unilateral promptly, the structure of being convenient for supports, and is close to bottom coal pulverizer or CFB boiler, grey pipeline is short, and flow resistance is little, and regulatory function is reliable, overhauls and maintains conveniently.

Description

Middle storage type fly ash conveying system for boiler mixed burning

Technical Field

The utility model belongs to the power engineering field for fly ash transport problem when solving the boiler and mixing the ash and burn together.

Background

The utilization approach of the high-carbon fly ash is basically to send the fly ash into a power boiler for reburning, the boiler capable of burning the fly ash comprises a pulverized coal furnace and a CFB furnace, the conveying mode and the mixing point selection of the fly ash are very important, and the fly ash cannot be effectively utilized due to the wrong system configuration.

If a certain engineering power boiler is a CFB furnace, the fly ash is uniformly mixed into the coal in the coal feeding process and then is fed into a hearth through a powder feeder, and as a result, the carbon content of the fly ash of the boiler is still high, and only the co-firing can be abandoned.

The other engineering boiler is a pulverized coal furnace, and fly ash is directly fed into a coal mill by a bin pump, so that the fly ash cannot be mixed into the coal mill when the coal mill normally operates.

SUMMERY OF THE UTILITY MODEL

The technical problem solved by the utility model is to provide a well storage type fly ash conveying system for boiler blending burning.

The technical means adopted by the utility model are as follows.

A fly ash conveying system for boiler mixed burning is characterized in that a fly ash middle storage bin is arranged close to one side of a coal bin, the fly ash middle storage bin is located above a coal feeder operation layer, a branch ash hopper is arranged at the bottom of the fly ash middle storage bin, an operation platform is arranged at a position, close to the branch ash hopper, of the coal feeder operation layer, the fly ash middle storage bin is communicated with an upstream ash bin through a pipeline, an outlet at the bottom of the branch ash hopper is communicated with an ash delivery pipeline through an ash dropping pipeline, and an outlet of the ash delivery pipeline is communicated with a coal mill or a CFB furnace chamber.

Preferably, a powder feeder and an upstream shutoff valve thereof are arranged on the ash falling pipeline.

Preferably, the distance between the operating platform and the powder feeder and the distance between the operating platform and the upstream shutoff valve meet the requirement of manual operation and control.

Preferably, still contain once cold-blast main and once hot-blast main, connect the ash conveying air pipe way after the export of once cold-blast main, once hot-blast main joins, all set up the regulation door of control temperature and flow and the isolated door that control was opened and close on once cold-blast main, once hot-blast main, set up the regulation door of control flow, the isolated door and the flowmeter that control was opened and close on the ash conveying air pipe way.

Preferably, for the CFB boiler, the ash feeding air pipeline is internally and separately filled with primary hot air

Preferably, for the pulverized coal furnace, the ash feeding air pipeline is filled with temperature-adjusting air which is mixed by cold and hot air.

The utility model discloses produced beneficial effect: the utility model discloses set up a surge bin between ash storehouse and boiler, storage bin in the flying dust is arranged to the close coal bunker unilateral promptly, and the structure of being convenient for supports, and is close to bottom coal pulverizer or CFB boiler, and the conveying line is short, and flow resistance is little, and regulatory function is reliable, overhauls and maintains the convenience.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic diagram of the system structure and transportation of the present invention.

Detailed Description

The utility model discloses a focus lies in, warehouse 1 in the flying dust is set up by the boiler coal bunker, and warehouse 1 is located the top on feeder operation layer 8 in this coal bunker and the flying dust.

The bottom of the fly ash middle storage bin 1 is provided with branch ash hoppers 2, and the number of the branch ash hoppers can be designed according to the actual situation. An operation platform 7 and an escalator are arranged at the position of the coal feeder running layer 8 close to the branch ash bucket 2 for people to walk and stop.

The fly ash intermediate storage bin 1 is communicated with an upstream ash storage bin through a pipeline, the bottom outlet of a branch ash hopper 2 of the fly ash intermediate storage bin 1 is communicated with an ash conveying air pipeline 6 through an ash falling pipeline 5, and a powder feeder 51 and an upstream shutoff valve 52 are arranged on the ash falling pipeline 5. The distance between the operating platform 7 and the powder feeder 51 and the upstream shutoff valve 52 is enough to realize manual operation and maintenance.

For the pulverized coal furnace, the outlet of the ash feeding air pipeline 6 is communicated with a coal mill; for a CFB boiler, the outlet of the ash feeding air pipeline 6 is communicated with the CFB furnace.

For a coal powder furnace, the air-ash ratio and the air-coal ratio are close to each other during mixing, the temperature of the conveyed air is close to the temperature of the coal powder airflow, the maximum pressure drop of the air-ash double-phase flow does not exceed the ventilation resistance of a coal mill under BMCR working conditions, the flow rate is controlled to be 18-20 m/s, the air-solid double-phase flow in the ash conveying air and the coal mill powder outlet pipe is preferably mixed at the same temperature, and the temperature cannot be too high, so that the temperature-adjusting air-conveying fly ash mixed by cold air and hot air is introduced into the ash conveying air pipeline 6, as shown in figure 2, the fly ash-conveying air-conveying fly ash comprises a primary cold air pipe 61 and a primary hot air pipe 62, the outlets of the primary cold air pipe 61 and the primary hot air pipe 62 are connected with the ash conveying air pipeline 6 after being converged, adjusting doors for controlling the temperature and the flow and the opening and closing of the primary hot air pipe 62, check valves are also required to be arranged on the primary hot air pipe 62, and the ash conveying air-conveying pipeline 6 is provided with the adjusting doors for controlling the flow, An isolation door for controlling opening and closing and a flowmeter.

For the CFB boiler, because the volatile component of the fly ash is extremely low, the hot air is directly conveyed into the hearth for combustion, and no side effect is caused, so that single primary hot air is introduced into the ash conveying air pipeline 6 to be used as conveying air of the fly ash, the fly ash is directly conveyed into the CFB hearth, and only the primary hot air pipe 62 is communicated with the ash conveying air pipeline 6 corresponding to the figure 2.

Claims

1. A middle storage type fly ash conveying system for boiler co-combustion is characterized in that a fly ash middle storage bin (1) is arranged close to one side of a coal bin, the fly ash middle storage bin (1) is located above a coal feeder running layer (8), a branch ash hopper (2) is arranged at the bottom of the fly ash middle storage bin (1), an operation platform (7) is arranged at the position, close to the branch ash hopper (2), of the coal feeder running layer (8), the storage bin in the fly ash middle storage bin (1) is communicated with an upstream ash bin through a pipeline, an outlet at the bottom of the branch ash hopper (2) is communicated with an ash conveying air pipeline (6) through an ash falling pipeline (5), and an outlet of the ash conveying air pipeline (6) is communicated with a coal mill or a CFB hearth.

2. The fly ash storage system for boiler co-firing according to claim 1, wherein the ash dropping pipe (5) is provided with a powder feeder (51) and an upstream shutoff valve (52).

3. The fly ash storage system for boiler co-firing according to claim 2, wherein the operating platform (7) is separated from the powder feeder (51) and the upstream shutoff valve (52) by a distance satisfying manual operation requirements.

4. The system for transporting the fly ash stored in the boiler in a blending manner according to claim 1, further comprising a primary cold air pipe (61) and a primary hot air pipe (62), wherein outlets of the primary cold air pipe (61) and the primary hot air pipe (62) are merged and then connected with the ash air supply pipeline (6), the primary cold air pipe (61) and the primary hot air pipe (62) are respectively provided with a regulating door for controlling temperature and flow and an isolation door for controlling opening and closing, and the ash air supply pipeline (6) is provided with a regulating door for controlling flow, an isolation door for controlling opening and closing and a flow meter.

5. The fly ash transfer system of any one of claims 1 to 4, wherein the primary hot air is separately introduced into the ash supply duct (6) for the CFB boiler.

6. The fly ash transfer system of any one of claims 1 to 4, wherein the ash supply duct (6) is supplied with a cold and hot mixed temperature-adjusting air for the pulverized coal furnace.