Pneumatic ash conveying device for ash hopper of economizer

Abstract

The utility model discloses a coal economizer ash hopper pneumatic ash conveying device which comprises a compressed air supply piece, a blocking blowing pipe, a conveying pipe, a fly ash conveyor and a coal economizer ash hopper, the air inlet end of the blocking blowing pipe and the air inlet end of the conveying pipe are both communicated with an air outlet of the compressed air supply piece, and a first valve and a second valve are arranged at the communication positions respectively. A feed port of the fly ash conveyor is communicated with a feed port of the economizer ash hopper, a feed valve is arranged at the communication position, an air inlet valve and a discharge valve are arranged on the conveying pipe at intervals in the air supply direction, the fly ash conveyor is installed on the conveying pipe and located between the air inlet valve and the discharge valve, and the tail end of the blowing and blocking pipe is blocked. And the blockage blowing pipe is communicated with the conveying pipe through the branch blowing pipe, the communicating position of the branch blowing pipe and the conveying pipe is located at the downstream position of the discharging valve, the third valve is arranged on the branch blowing pipe, pulverized coal conveying is smooth, and timely communication can be achieved even if blockage occurs.

Description

Technical Field

[0001] The utility model belongs to the technical field of pneumatic conveying of pulverized coal, in particular to a pneumatic ash conveying device for an economizer ash hopper. Background Art

[0002] Coal-fired power plants use a large amount of coal, and coal powder is mostly stored in coal bunkers. In order to reduce the pollution caused by coal powder dust in the plant area, coal powder is mostly pressurized and pneumatically transported in a boiling state when it is used. During pneumatic transportation, the transportation distance is long and it is not easy to generate dust during transportation. However, the coal delivery flow rate should not be too large. Once the coal delivery flow rate is large, coal powder is prone to block the pipe and affect the normal transportation of coal powder. For example, although a blow-blocking valve is provided in the announcement number CN215325733U "A Fly Ash Transportation System for Coal-fired Power Plants", which has a certain anti-blocking function, it can only blow and block at a single point, and its blowing and blocking effect is poor. Utility Model Content

[0003] In order to solve the above technical problems, the purpose of the utility model is to provide a pneumatic ash conveying device for an economizer ash hopper which has a simple structure and can smoothly convey coal powder.

[0004] In order to achieve the above-mentioned purpose, the technical scheme of the utility model is as follows: an economizer ash hopper pneumatic ash conveying device, comprising a compressed air supply part, a blow-off pipe, a conveying pipe, a fly ash conveyor and an economizer ash hopper, the air inlet ends of the blow-off pipe and the conveying pipe are both connected to the air outlet of the compressed air supply part, a first valve is provided at the connection between the air inlet end of the blow-off pipe and the air outlet of the compressed air supply part, a second valve is provided at the connection between the air inlet end of the conveying pipe and the air outlet of the compressed air supply part, and the fly ash conveyor is connected to the compressed air supply part. The feed port of the conveyor is connected with the feed port of the economizer ash hopper, and a material valve is arranged at the connection point. The conveying pipe is provided with an air intake valve and a discharge valve at intervals along the air supply direction. The fly ash conveyor is installed on the conveying pipe and is located between the air intake valve and the discharge valve. The end of the blowing and blocking pipe is blocked, and the blowing and blocking pipe is connected to the conveying pipe through an air blowing branch pipe. The connection point between the air blowing branch pipe and the conveying pipe is located downstream of the discharge valve, and a third valve is arranged on the air blowing branch pipe.

[0005] The beneficial effect of the above technical solution is that when coal powder is transported, coal powder is first supplied from the economizer ash hopper to the fly ash conveyor, and then compressed air is supplied to the conveying pipe. The compressed air blows the coal powder in the fly ash conveyor into a fluidized state and sends it out along the conveying pipe. When there is blockage in the conveying pipe, compressed air can be blown into the conveying pipe through the blowing pipe through the blowing branch pipe to clear the blockage in the conveying pipe.

[0006] In the above technical solution, a plurality of air blowing branch pipes are provided, and the connecting points between the plurality of air blowing branch pipes and the conveying pipe are spaced apart along the length direction of the conveying pipe.

[0007] The beneficial effect of the above technical solution is that: in this way, the downstream of the conveying pipe is provided with a plurality of spaced-apart purge points along its length direction, and the connection point between each blowing branch pipe and the conveying pipe constitutes a purge point. At this time, when blockage occurs in the conveying pipe, the blowing branch pipe corresponding to the purge point close to the blockage point can be used to blow out the blockage.

[0008] The above technical solution also includes a boosting pipe, both ends of which are respectively connected to the conveying pipe, and the fly ash conveyor is located between the two ends of the boosting pipe on the conveying pipe, the end of the boosting pipe is located between the fly ash conveyor and the discharge valve, and a fourth valve is arranged on the boosting pipe.

[0009] The beneficial effect of the above technical solution is that after all the coal powder in the fly ash conveyor is delivered, the booster pipe can pass through the fly ash conveyor to pressurize the conveying pipe.

[0010] In the above technical solution, there are multiple fly ash conveyors and economizer ash hoppers, and the multiple fly ash conveyors correspond one-to-one to the multiple economizer ash hoppers. The feed port of each fly ash conveyor is connected with the feed port of the corresponding economizer ash hopper, and the feed valve is provided at the connection point. The multiple fly ash conveyors are installed on the conveying pipe and are located between the air intake valve and the discharge valve.

[0011] The beneficial effect of the above technical solution is that multiple fly ash conveyors are connected in series on the conveying pipe, and one or more fly ash conveyors and the corresponding economizer ash hoppers can be flexibly selected to deliver coal powder.

[0012] The above technical solution also includes multiple boosting pipes, and the multiple boosting pipes correspond one-to-one to the multiple fly ash conveyors, both ends of each of the boosting pipes are connected to the conveying pipe, and the end of each of the boosting pipes is located downstream of the corresponding fly ash conveyor, the head ends of the multiple boosting pipes merge and are connected to the upstream of the conveying pipe, and the positions of the multiple fly ash conveyors on the conveying pipe are all located downstream of the head ends of the multiple boosting pipes, and a fourth valve is provided on each of the boosting pipes.

[0013] The beneficial effect of the above technical solution is that it is more flexible to select a booster pipe corresponding to the fly ash conveyor to pressurize the downstream of the conveying pipe to convey the coal powder.

[0014] In the above technical solution, pressure gauges are provided at the connection points between the delivery pipe and the blow-off pipe and the compressed air supply member.

[0015] The beneficial effect of the above technical solution is that the pressure of the compressed air in the delivery pipe and the blow-off pipe can be easily known.

[0016] The compressed air supply component in the above technical solution includes an air storage tank, which has an air inlet and an air outlet. The air inlet of the air storage tank is connected to the factory compressed air supply pipe, and a fifth valve is provided at the connection point. The blowing and blocking pipe and the delivery pipe are both connected to the air outlet of the air storage tank.

[0017] The beneficial effect of the above technical solution is that the air storage tank is pressurized by the factory compressed air supply pipe, and the air storage tank stores and stabilizes the compressed air, while the delivery pipe and the blow-off pipe are both supplied with compressed air by the air storage tank.

[0018] The gas storage tank in the above technical solution is provided with a pressure gauge and a safety valve.

[0019] The beneficial effect of the above technical solution is that the pressure inside the gas storage tank can be monitored by the pressure gauge on the gas storage tank, and the safety valve serves as a safety redundancy of the gas storage tank.

[0020] A sixth valve is also provided at the gas outlet of the gas storage tank in the above technical solution.

[0021] The beneficial effect of the above technical solution is that when the first valve or the second valve fails, the sixth valve can be used to close the gas outlet of the gas storage tank to avoid gas leakage.

[0022] A flow meter is also provided at the gas outlet of the gas storage tank in the above technical solution.

[0023] The beneficial effect of the above technical solution is that the flow rate of the airflow discharged from the air storage tank can be monitored by the flow meter. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the structure of the pneumatic ash conveying device for the economizer ash hopper described in Example 1 of the utility model;

[0025] Figure 2 This is a schematic diagram of the structure of the pneumatic ash conveying device for the economizer ash hopper described in Example 2 of the utility model;

[0026] Figure 3 This is a structural schematic diagram of the pneumatic ash conveying device for the economizer ash hopper described in Example 3 of the utility model.

[0027] In the figure: 1 compressed air supply parts; 11 air storage tank; 12 compressed air supply pipe for plant; 2 blowing and plugging pipe; 3 conveying pipe; 4 fly ash conveyor; 5 economizer ash hopper; 61 first valve; 62 second valve; 63 material valve; 64 air inlet valve; 65 discharge valve; 66 third valve; 67 fourth valve; 68 fifth valve; 69 sixth valve; 7 blowing branch pipe; 8 booster pipe; 91 pressure gauge; 92 flow meter; 93 safety valve. DETAILED DESCRIPTION

[0028] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention. The present invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become clearer according to the following description and claims. It should be noted that the drawings are all in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0029] Example 1

[0030] like Figure 1 As shown, the present embodiment provides a pneumatic ash conveying device for an economizer ash hopper, comprising a compressed air supply part 1, a blow-off pipe 2, a conveying pipe 3, a fly ash conveyor 4 and an economizer ash hopper 5, the air inlet ends of the blow-off pipe 2 and the conveying pipe 3 are both connected with the air outlet of the compressed air supply part 1, a first valve 61 is provided at the connection between the air inlet end of the blow-off pipe 2 and the air outlet of the compressed air supply part 1, a second valve 62 is provided at the connection between the air inlet end of the conveying pipe 3 and the air outlet of the compressed air supply part 1, the feed port of the fly ash conveyor 4 is connected with the feed port of the economizer ash hopper 5, and a feed valve 63 is provided at the connection, an air inlet valve 64 and a discharge valve 65 are provided at intervals along the air supply direction on the conveying pipe 3, and the fly ash conveyor 4 is provided with a plurality of air inlet valves 64 and a discharge valve 65. It is installed on the conveying pipe 3 and is located between the air inlet valve 64 and the discharge valve 65. The end of the blowing pipe 2 is blocked, and the blowing pipe 2 is connected to the conveying pipe 3 through the blowing branch pipe 7. The connecting point between the blowing branch pipe 7 and the conveying pipe 3 is located downstream of the discharge valve 65, and a third valve 66 is provided on the blowing branch pipe 7. In this way, when the coal powder is transported, the economizer ash hopper first supplies the coal powder to the fly ash conveyor, and then supplies compressed air to the conveying pipe. The compressed air blows the coal powder in the fly ash conveyor to a fluidized state and sends it out along the conveying pipe. When there is blockage in the conveying pipe, the compressed air can be blown into the conveying pipe through the blowing branch pipe to clear the blockage in the conveying pipe.

[0031] In this embodiment, the fly ash conveyor 4 further has an air inlet and an air outlet. The conveying pipe is cut off at the installation location of the fly ash conveyor 4, and the cut-off location is respectively connected to the air inlet and the air outlet of the fly ash conveyor.

[0032] In the above technical solution, the blowing branch pipes 7 are provided in plurality, and the connecting points of the plurality of blowing branch pipes 7 and the conveying pipe 3 are spaced apart along the length direction of the conveying pipe 3, so that the downstream of the conveying pipe has a plurality of spaced apart blowing points along its length direction, and the connecting point of each blowing branch pipe and the conveying pipe constitutes a blowing point. At this time, when blockage occurs in the conveying pipe, the blowing branch pipe corresponding to the blowing point close to the blockage point can be used to blow and remove the blockage.

[0033] The above technical solution also includes a boosting pipe 8, both ends of which are connected to the conveying pipe 3 respectively, and the fly ash conveyor 4 is located between the two ends of the boosting pipe 8 on the conveying pipe 3, and the end of the boosting pipe 8 is located between the fly ash conveyor 4 and the discharge valve 65. A fourth valve 67 is provided on the boosting pipe 8, so that after the coal powder in the fly ash conveyor is sent out, the boosting pipe can pass over the fly ash conveyor to pressurize the conveying pipe.

[0034] In this embodiment, one end of the boost pipe 8 is located between the air inlet valve 64 and the air inlet of the fly ash conveyor 4, and the other end of the boost pipe 8 is located between the air outlet of the fly ash conveyor 4 and the discharge valve.

[0035] As for the fly ash conveyor 4, compressed air is sent into the air inlet of the fly ash conveyor 4, so that the coal ash in the fly ash conveyor 4 is in a boiling state and is sent out through the air outlet of the fly ash conveyor.

[0036] In this embodiment, the first valve 61, the second valve 62, the material valve 63, the air inlet valve 64, the discharge valve 65, the third valve 66 and the fourth valve 67 can all be pneumatic ball valves.

[0037] Example 2

[0038] like Figure 2 As shown, the same as Example 1, the difference is that this embodiment provides that the fly ash conveyor 4 and the economizer ash hopper 5 in the above technical solution are both provided in plurality, and the plurality of fly ash conveyors 4 correspond one-to-one to the plurality of economizer ash hoppers 5, and the feed port of each fly ash conveyor 4 is connected with the corresponding feed port of the economizer ash hopper 5, and the feed valve 63 is provided at the connection point, and the plurality of fly ash conveyors 4 are all installed on the conveying pipe 3, and are all located between the air intake valve 64 and the discharge valve 65, so that the plurality of fly ash conveyors are connected in series on the conveying pipe, which can also flexibly select one or more fly ash conveyors and the corresponding economizer ash hoppers to deliver the coal powder.

[0039] The above technical solution also includes multiple boosting pipes 8, and the multiple boosting pipes 8 correspond one-to-one to the multiple fly ash conveyors 4. Both ends of each boosting pipe 8 are connected to the conveying pipe 3, and the end of each boosting pipe 8 is located downstream of the corresponding fly ash conveyor 4. The head ends of the multiple boosting pipes 8 merge and are connected to the upstream of the conveying pipe 3, and the positions of the multiple fly ash conveyors 4 on the conveying pipe 3 are all located downstream of the head ends of the multiple boosting pipes 8. A fourth valve 67 is provided on each boosting pipe 8, so that the boosting pipe corresponding to the fly ash conveyor can be more flexibly selected to pressurize the downstream of the conveying pipe to convey coal powder.

[0040] In this embodiment, the connection point where one end of the multiple boosting pipes 8 merge and connect with the conveying pipe is located between the air intake valve 64 and the air inlet of the most upstream fly ash conveyor 4, and the other end of each boosting tank 8 is connected to the air outlet of the corresponding fly ash conveyor.

[0041] When delivering ash, the pneumatic ash conveying device for the economizer ash hopper described in the present embodiment needs to open the material valve corresponding to the economizer ash hopper that needs to discharge (at this time, a single economizer ash hopper can deliver coal or multiple economizer ash hoppers can deliver coal at the same time), and then the conveying pipe can be used to deliver the coal. In order to prevent the accumulation of coal powder in the fly ash conveyor 4 from affecting the smoothness of the material delivery downstream of the conveying pipe, the fourth valve 67 on the boosting pipe corresponding to the corresponding fly ash conveyor can be opened to allow part of the compressed air to bypass the corresponding fly ash conveyor through the boosting pipe and discharge it directly to the downstream of the conveying pipe, thereby ensuring smooth coal powder transportation downstream of the conveying pipe.

[0042] Example 3

[0043] like Figure 2 As shown, the same as Example 1 or Example 2, the difference is that in this embodiment, the connection points between the delivery pipe 3 and the blow-blocking pipe 2 and the compressed air supply part 1 are provided with pressure gauges 91, so that the pressure of the compressed air in the delivery pipe and the blow-blocking pipe can be conveniently known.

[0044] The compressed air supply component 1 in the above technical solution includes an air storage tank 11, which has an air inlet and an air outlet. The air inlet of the air storage tank 11 is connected to the factory compressed air supply pipe 12, and a fifth valve 68 is provided at the connection point. The blowing and plugging pipe 2 and the delivery pipe 3 are both connected to the air outlet of the air storage tank 11, so that the air storage tank is pressurized by the factory compressed air supply pipe, and the air storage tank stores and stabilizes the pressure of compressed air, and the delivery pipe and the blowing and plugging pipe are both supplied with compressed air by the air storage tank.

[0045] In the above technical solution, the gas storage tank 11 is provided with a pressure gauge 91 and a safety valve 93, so that the pressure gauge on the gas storage tank can be used to monitor the pressure inside the gas storage tank, and the safety valve serves as a safety redundancy of the gas storage tank.

[0046] The gas outlet of the gas storage tank 11 in the above technical solution is also provided with a sixth valve 69, so that when the first valve or the second valve fails, the gas outlet of the gas storage tank can be closed by the sixth valve to avoid gas leakage.

[0047] In the above technical solution, a flow meter 92 is also provided at the gas outlet of the gas storage tank 11, so that the flow rate of the gas flow discharged from the gas storage tank can be monitored by the flow meter.

[0048] In this embodiment, the fifth valve 68 and the sixth valve 69 can both be manual valves.

[0049] The above description is only a preferred embodiment of the utility model and does not limit the utility model in any form. Any ordinary technician in the industry can smoothly implement the utility model as shown in the drawings of the specification and described above. However, any equivalent changes, modifications and evolutions made by technicians familiar with the profession without departing from the scope of the technical solution of the utility model using the technical content disclosed above are all equivalent embodiments of the utility model. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the utility model are still within the protection scope of the technical solution of the utility model.

Claims

1. A pneumatic ash conveying device for economizer ash hopper, characterized in that: The invention comprises a compressed air supply component (1), a blow-off pipe (2), a conveying pipe (3), a fly ash conveyor (4) and an economizer ash hopper (5), wherein the air inlet ends of the blow-off pipe (2) and the conveying pipe (3) are both connected to the air outlet of the compressed air supply component (1), a first valve (61) is provided at the connection point between the air inlet end of the blow-off pipe (2) and the air outlet of the compressed air supply component (1), a second valve (62) is provided at the connection point between the air inlet end of the conveying pipe (3) and the air outlet of the compressed air supply component (1), a feed port of the fly ash conveyor (4) is connected to a feed port of the economizer ash hopper (5), and A material valve (63) is provided at the connection point, an air intake valve (64) and a discharge valve (65) are provided on the conveying pipe (3) at intervals along the air supply direction, the fly ash conveyor (4) is installed on the conveying pipe (3) and is located between the air intake valve (64) and the discharge valve (65), the end of the blow-off pipe (2) is blocked, and the blow-off pipe (2) is connected to the conveying pipe (3) through an air blowing branch pipe (7), and the connection point between the air blowing branch pipe (7) and the conveying pipe (3) is located downstream of the discharge valve (65), and a third valve (66) is provided on the air blowing branch pipe (7).

2. The economizer ash hopper pneumatic ash conveying device according to claim 1 is characterized in that: A plurality of the air blowing branch pipes (7) are provided, and the connecting points between the plurality of air blowing branch pipes (7) and the conveying pipe (3) are spaced apart along the length direction of the conveying pipe (3).

3. The economizer ash hopper pneumatic ash conveying device according to claim 1, characterized in that: It also includes a boosting pipe (8), the two ends of which are respectively connected to the conveying pipe (3), and the fly ash conveyor (4) is located between the two ends of the boosting pipe (8) on the conveying pipe (3), the end of the boosting pipe (8) is located between the fly ash conveyor (4) and the discharge valve (65), and a fourth valve (67) is provided on the boosting pipe (8).

4. The economizer ash hopper pneumatic ash conveying device according to claim 1, characterized in that: The fly ash conveyor (4) and the economizer ash hopper (5) are provided in plurality, and the plurality of fly ash conveyors (4) correspond one-to-one to the plurality of economizer ash hoppers (5). The feed port of each fly ash conveyor (4) is connected to the feed port of the corresponding economizer ash hopper (5), and the feed valve (63) is provided at the connection point. The plurality of fly ash conveyors (4) are installed on the conveying pipe (3) and are located between the air intake valve (64) and the discharge valve (65).

5. The economizer ash hopper pneumatic ash conveying device according to claim 4, characterized in that: It also includes a plurality of boosting pipes (8), and the plurality of boosting pipes (8) correspond one-to-one to the plurality of fly ash conveyors (4), both ends of each of the boosting pipes (8) are connected to the conveying pipe (3), and the end of each of the boosting pipes (8) is located downstream of the corresponding fly ash conveyor (4), the head ends of the plurality of boosting pipes (8) merge and are connected to the upstream of the conveying pipe (3), and the positions of the plurality of fly ash conveyors (4) on the conveying pipe (3) are all located downstream of the head ends of the plurality of boosting pipes (8), and a fourth valve (67) is provided on each of the boosting pipes (8).

6. The economizer ash hopper pneumatic ash conveying device according to claim 1, characterized in that: A pressure gauge (91) is provided at the connection point between the delivery pipe (3) and the blow-off pipe (2) and the compressed air supply member (1).

7. The economizer ash hopper pneumatic ash conveying device according to claim 1, characterized in that: The compressed air supply component (1) comprises an air storage tank (11), the air storage tank (11) having an air inlet and an air outlet, the air inlet of the air storage tank (11) being connected to a plant compressed air supply pipe (12), and a fifth valve (68) being provided at the connection point, and the blowing and blocking pipe (2) and the delivery pipe (3) are both connected to the air outlet of the air storage tank (11).

8. The economizer ash hopper pneumatic ash conveying device according to claim 7, characterized in that: The gas storage tank (11) is provided with a pressure gauge (91) and a safety valve (93).

9. The economizer ash hopper pneumatic ash conveying device according to claim 7, characterized in that: A sixth valve (69) is also provided at the gas outlet of the gas storage tank (11).

10. The economizer ash hopper pneumatic ash conveying device according to claim 7, characterized in that: A flow meter (92) is also provided at the gas outlet of the gas storage tank (11).

Images