Coal sticking prevention system for middle section of coal drop pipe

Abstract

The utility model discloses a coal drop pipe middle section coal sticking prevention system which comprises a unit, the unit is provided with a coal drop pipe and a coal feeder, the coal drop pipe is connected with the coal feeder through a lower compensation joint and an upper compensation joint, a vibration motor is fixed on the coal drop pipe, a coal outlet is formed in the bottom of the unit, a coal inlet is formed in the top of the coal feeder, and the vibration motor is fixed on the vibration motor. The unit and the coal feeder are both fixed with the carrier, a medium pipeline is arranged at the top of the coal feeder, and the medium pipeline is provided with a valve body. According to the coal drop pipe middle section coal sticking prevention system, the vibration motor and the compensation joint are additionally arranged, intermittent starting and cleaning of blocked waste in the coal drop pipe are achieved through exciting force, the personnel maintenance cost and the labor intensity are reduced, and the problems that an air cannon at a coal feeding port cannot clean blocked coal from the coal feeding port to the middle section of the expansion joint, and the coal drop pipe is prone to red burning due to boiler blowback are solved. And a flaming fire hazard is easily caused.

Description

Technical Field

[0001] The utility model relates to the technical field of machine units, in particular to a coal dropping pipe middle section anti-sticking coal system. Background Art

[0002] The unit can accurately adjust the coal feeding amount of the coal mill according to the load requirements. It is arranged between the raw coal hopper and the coal mill. In the direct-blowing pulverizing system, the coal feeding amount is directly adapted to the boiler load.

[0003] Since gangue thermal power plants generally burn low-quality fuels such as coal slime, gangue, and sludge with high humidity, the coal drop pipe is prone to coal blockage during operation. The incoming coal also has weather content and coal slag agglomeration, resulting in insufficient coal supply and load limitation during boiler operation, which brings major safety hazards to operation and increases the workload of operation and maintenance personnel. The existing coal feeding port air cannon cannot clear the coal blockage in the middle section from the coal feeding port to the expansion joint, and the boiler backblowing can easily burn the coal drop pipe red, which can easily cause a flame-spraying fire. Utility Model Content

[0004] The utility model aims to provide a system for preventing coal from sticking in the middle section of a coal drop pipe, so as to solve the problems raised in the above-mentioned background technology.

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

[0006] A system for preventing coal from sticking in the middle section of a coal dropping pipe comprises a unit. The unit is provided with a coal dropping pipe and a coal feeder. The coal dropping pipe is connected to the coal feeder through a lower compensation joint and an upper compensation joint. A vibration motor is fixed on the coal dropping pipe.

[0007] As a further solution of the utility model: a coal outlet is arranged at the bottom of the unit, a coal inlet is arranged at the top of the coal feeder, and the unit and the coal feeder are both fixed to the carrier.

[0008] As a further solution of the utility model: a medium pipeline is arranged on the top of the coal feeder, and the medium pipeline is provided with a valve body.

[0009] As a further solution of the utility model: it also includes a hot air system;

[0010] The hot air system includes a circulation pipeline, a return pipeline, a fan and a heat exchanger. The unit is connected to the fan and the heat exchanger in sequence through the return pipeline, and the heat exchanger is connected to the medium pipeline through the circulation pipeline.

[0011] As a further solution of the utility model: the heat exchanger is located in the smoke pipe of the pulverized coal furnace, and the airflow passes through the heat exchanger to perform heat exchange in the smoke pipe.

[0012] As a further solution of the utility model: a gas volume compensation pipeline is arranged on the return pipeline.

[0013] As a further solution of the utility model: the valve body is a three-way valve, the other end of the valve body is connected to the cooling water pipeline, and a drain outlet is arranged at the bottom of the unit.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] 1. The anti-sticking coal system in the middle section of the coal drop pipe is installed with a vibration motor and a compensation joint, and is started intermittently by the exciting force to clean the waste blocked in the coal drop pipe, reduce the maintenance cost and labor intensity of personnel, and solve the problem that the air cannon at the coal feeding port cannot clear the coal blockage in the middle section from the coal feeding port to the expansion joint, and the boiler backblowing easily burns the coal drop pipe red, which is easy to cause flames.

[0016] 2. The anti-sticking coal system in the middle section of the coal drop pipe recovers the waste heat of flue gas through the hot air system, increases the temperature inside the coal drop pipe, and prevents coal slag from agglomerating and causing blockage due to the cold environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The figure is a structural schematic diagram of a system for preventing coal from sticking in the middle section of a coal drop pipe.

[0018] In the figure: 1. Unit; 2. Lower compensation section; 3. Coal drop pipe; 4. Upper compensation section; 5. Coal feeder; 6. Vibration motor; 7. Air inlet pipeline; 8. Circulation pipeline; 9. Return pipeline; 10. Gas volume compensation pipeline; 11. Fan; 12. Heat exchanger; 14. Cooling water pipeline; 15. Drain outlet. DETAILED DESCRIPTION

[0019] See also Figure 1In the embodiment of the utility model, a system for preventing coal from sticking in the middle section of a coal drop pipe comprises a unit 1, wherein the unit 1 is provided with a coal drop pipe 3 and a coal feeder 5, and is characterized in that the coal drop pipe 3 is connected to the coal feeder 5 through a lower compensation section 2 and an upper compensation section 4, and a vibration motor 6 is fixed on the coal drop pipe 3. After the vibration motor 6 is installed in the middle section of the boiler coal drop pipe 3, when the coal sticks in the middle section of the coal drop pipe 3 and cannot be knocked off by external force, the vibration motor 6 is started, and the starting time is about 5 seconds, and intermittent vibration is performed, so that the coal sticking in the coal drop pipe can be removed, which effectively saves manpower and relieves the pressure of equipment maintenance. A three-phase asynchronous vibration motor is installed in the middle section of each coal drop pipe 3, and the maximum exciting force is 10KN. Through this renovation by adding a vibration motor 6 to the coal drop pipe 3, when the burning coal in the middle section of the coal drop pipe is sticky and cannot be knocked off by human power, the vibration motor is started intermittently for 3 to 5 seconds to quickly and effectively remove the burning coal in the middle section of the coal drop pipe. Before the renovation, it took an average of 6 to 12 hours to manually clear the coal drop pipe 3 of each coal feeder. After the renovation, according to the severity of the coal blockage in the coal drop pipe 3 of each coal feeder, the fastest manual clearing time is about 30 minutes and a maximum of about 2 hours. It can be seen that after the renovation, the company can reduce personnel maintenance costs, etc., contribute to the company's efforts to create profits, and solve the problem that the air cannon at the coal feeding port cannot clear the coal blockage in the middle section from the coal feeding port to the expansion joint, and the boiler backblowing is easy to burn the coal drop pipe red, which is easy to cause flames.

[0020] In a preferred embodiment, a coal outlet is provided at the bottom of the unit 1, and a coal inlet is provided at the top of the coal feeder 5. The unit 1 and the coal feeder 5 are both fixed to a carrier. The unit 1 and the coal feeder 5 need to bear a huge weight during operation, and the coal drop pipe 3 is equipped with a lower compensation section 2 and an upper compensation section 4, resulting in a lack of rigidity. Therefore, the unit 1 and the coal feeder 5 need to be fixed to the carrier to bear the weight.

[0021] See also Figure 1 In the embodiment of the utility model, a medium pipeline 7 is also provided on the top of the coal feeder 5, and the medium pipeline 7 is provided with a valve body to prevent backblowing.

[0022] In a preferred embodiment, it also includes a hot air system;

[0023] The hot air system includes a circulation pipeline 8, a return pipeline 9, a fan 11 and a heat exchanger 12. The unit 1 is connected to the fan 11 and the heat exchanger 12 in sequence through the return pipeline 9. The heat exchanger 12 is connected to the medium pipeline 7 through the circulation pipeline 8. The heat exchanger 12 is located in the smoke pipe of the pulverized coal furnace. The airflow exchanges heat in the smoke pipe through the heat exchanger 12. During the coal feeding stage of the boiler, the coal slag is affected by the cold environment and agglomerated, and sticks to the pipe wall, causing blockage. The hot air flow is sent inward through the circulation pipeline 8. The hot air flow exchanges heat with the smoke pipe of the pulverized coal furnace through the heat exchanger 12, thereby increasing the air flow temperature, and is sent into the coal drop pipe 3 to increase the temperature in the coal drop pipe 3 to prevent the coal slag from agglomerating and causing blockage.

[0024] In a preferred embodiment, a gas volume compensation pipeline 10 is provided on the return pipeline 9, and the airflow is reused through the return pipeline 9. A filtering device can be provided in the return pipeline 9 to reduce the entry of dust, and the gas volume compensation pipeline 10 compensates for the airflow.

[0025] In a preferred embodiment, the valve body is a three-way valve, the other end of the valve body is connected to the cooling water pipeline 14, and a drain port 15 is provided at the bottom of the unit 1. When the boiler waste is discharged, the humidity is high and the poor fuels such as coal slime, gangue, sludge, etc. are cooled by water to avoid the agglomeration of high-temperature coal slag. To prevent the agglomeration of high-temperature coal slag, the temperature can be suppressed in time when the boiler has a backblowing phenomenon.

[0026] It should be noted that the above embodiments all belong to the same utility model concept, and the description of each embodiment has its own focus. For matters that are not described in detail in some embodiments, reference can be made to the description in other embodiments.

[0027] The above-mentioned embodiments only express the implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A system for preventing coal from sticking in the middle section of a coal chute, comprising a unit (1), wherein the unit (1) is provided with a coal chute (3) and a coal feeder (5), and characterized in that: The coal drop pipe (3) is connected to the coal feeder (5) via a lower compensation joint (2) and an upper compensation joint (4), and a vibration motor (6) is fixed to the coal drop pipe (3).

2. The system for preventing coal from sticking in the middle section of a coal drop pipe according to claim 1, characterized in that: The bottom of the unit (1) is provided with a coal outlet, and the top of the coal feeder (5) is provided with a coal inlet. Both the unit (1) and the coal feeder (5) are fixed to a carrier.

3. The system for preventing coal from sticking in the middle section of a coal drop pipe according to claim 1, characterized in that: A medium pipeline (7) is provided at the top of the coal feeder (5), and the medium pipeline (7) is provided with a valve body.

4. The system for preventing coal from sticking in the middle section of a coal drop pipe according to claim 3, characterized in that: Also includes hot air system; The hot air system comprises a circulation pipeline (8), a return pipeline (9), a fan (11) and a heat exchanger (12); the unit (1) is connected to the fan (11) and the heat exchanger (12) in sequence via the return pipeline (9); and the heat exchanger (12) is connected to the medium pipeline (7) via the circulation pipeline (8).

5. The system for preventing coal from sticking in the middle section of a coal drop pipe according to claim 4, characterized in that: The heat exchanger (12) is located in the smoke pipe of the pulverized coal furnace, and the airflow passes through the heat exchanger (12) to perform heat exchange in the smoke pipe.

6. The system for preventing coal from sticking in the middle section of a coal drop pipe according to claim 4, characterized in that: A gas volume compensation pipeline (10) is provided on the return pipeline (9).

7. The system for preventing coal from sticking in the middle section of a coal drop pipe according to claim 3, characterized in that: The valve body is a three-way valve, the other end of the valve body is connected to a cooling water pipeline (14), and a drain outlet (15) is provided at the bottom of the unit (1).

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