An energy-saving coal-loading system for power plant boilers

Abstract

The present invention discloses an energy-saving coal-loading system for a power plant boiler, including a boiler, a coal mill, a flue gas treatment device, a flue gas drying device, and a heating device. A coal storage chamber is provided on one side of the boiler for storing coal powder. A coal dropping pipe is provided between the boiler and the combustion aid, so that the coal mill grinds the coal and sends it into the coal storage chamber through the coal dropping pipe. A smoke exhaust pipe is provided between the exhaust gas treatment device and the boiler, so that the exhaust gas treatment device treats the flue gas discharged by the boiler. An air intake pipe is provided between the flue gas drying device and the flue gas treatment device, so that the flue gas drying device dries the flue gas in the flue gas treatment device. The smoke exhaust pipe is connected to the heating device, an air outlet pipe is connected between one end of the heating device and the flue gas drying device, and a combustion-supporting pipe is provided between the other end and the boiler. The present invention utilizes the flue gas generated by the boiler to transport coal powder, and at the same time heats the flue gas and sends it into the boiler, thereby increasing the heating area of ​​the boiler, which is both energy-saving and environmentally friendly.

Description

Technical Field

[0001] The invention relates to the technical field of thermal power plants, and in particular to an energy-saving coal feeding system for a boiler in a power plant. Background Art

[0002] Thermal power plant is abbreviated as thermal power plant, which is a factory that uses combustibles (such as coal) as fuel to produce electricity. Its basic production process is: when the fuel is burned, it heats water to generate steam, converting the chemical energy of the fuel into thermal energy, and the steam pressure drives the turbine to rotate, converting the thermal energy into mechanical energy, and then the turbine drives the generator to rotate, converting the mechanical energy into electrical energy. When the existing thermal power plant carries out air transportation, it uses different fans to transport air to the power plant separately. At the same time, when the fan is used to extract the air in the boiler, the air extracted from the boiler contains a large amount of heat and will be directly discharged into the atmosphere, resulting in heat loss and waste of resources. In addition, the coal used for boiler combustion has some particles that are too large after being processed by the coal mill, which cannot meet the particle size requirements of high-efficiency industrial pulverized coal boilers for fine coal powder. Summary of the invention

[0003] The technical problem to be solved by the embodiments of the present invention is to provide an energy-saving coal-feeding system for a power plant boiler, which utilizes the flue gas generated by the boiler to transport pulverized coal, and at the same time heats the flue gas and feeds it into the boiler, thereby increasing the heating area of ​​the boiler, which is both energy-saving and environmentally friendly, and ensures that the particle size of the pulverized coal is uniform, which is convenient for boiler combustion.

[0004] In order to achieve the above object, the present invention discloses an energy-saving coal feeding system for a power plant boiler, comprising:

[0005] A boiler, wherein a coal storage chamber is provided on one side of the boiler for storing pulverized coal;

[0006] A coal mill, wherein a coal dropping pipe is provided between the coal mill and the coal storage chamber, so that the coal mill grinds the coal and delivers the coal into the coal storage chamber through the coal dropping pipe;

[0007] A flue gas treatment device, wherein a flue gas exhaust pipe is provided between the flue gas treatment device and the boiler, so that the flue gas treatment device can treat the flue gas discharged by the boiler;

[0008] A flue gas drying device, wherein an air intake duct is provided between the flue gas drying device and the flue gas treatment device, so that the flue gas drying device dries the flue gas in the flue gas treatment device;

[0009] The heating device is connected to the smoke exhaust pipe, an air outlet pipe is connected between one end of the heating device and the smoke drying device, and a combustion-supporting pipe is arranged between the other end of the heating device and the boiler.

[0010] Preferably, an air supply pipeline is provided between the air outlet pipeline and the coal storage chamber.

[0011] Preferably, it also includes a crusher, a discharge pipe is arranged between the crusher and the coal dropping pipe, a coal screening net is arranged on the inner wall of the coal dropping pipe below the discharge pipe, and the coal screening net is used to screen coal powder, so that the coal powder that fails to pass the screening falls into the crusher through the discharge pipe for secondary crushing.

[0012] Preferably, a receiving box is provided below the pulverizer, a coal delivery pipe is connected between the receiving box and the coal mill, a first fan is provided on the coal delivery pipe, the coal powder in the pulverizer falls into the receiving box, and the coal powder in the receiving box is delivered into the coal mill through the coal delivery pipe under the action of the first fan.

[0013] Preferably, a pair of lower silos are provided above the coal mill for storing coal, and a feeding device is provided at the bottom of each of the lower silos so that the feeding device can deliver the coal in the lower silos into the coal mill.

[0014] Preferably, a second fan is provided on the air outlet duct.

[0015] Preferably, the flue gas treatment device comprises a treatment tank, a filter screen is arranged in the middle of the treatment tank, an air outlet of the treatment tank is connected to the air inlet pipe, and an air inlet of the treatment tank is connected to the air inlet of the smoke exhaust pipe.

[0016] Preferably, the fume drying device comprises a drying tower, an air inlet of the drying tower is connected to the air inlet pipe, and an air outlet of the drying tower is connected to the air outlet pipe.

[0017] Implementing the embodiments of the present invention has the following beneficial effects:

[0018] In the present invention, after the coal is ground into coal powder by the coal mill, it is sent to the coal storage chamber for storage. At the same time, large pieces of coal powder are screened out through the coal screening net, and are crushed again by the pulverizer and sent back to the coal mill, thereby ensuring that the particle size of the coal powder is uniform and convenient for combustion in the boiler.

[0019] The present invention recycles the hot smoke generated by the boiler so that the hot smoke is dusted and dried. A part of the smoke is used for heating and sent into the boiler to increase the combustion effect of the boiler and reduce the energy consumption of the boiler. The other part is directly sent into the coal storage chamber to blow the coal powder in the coal storage chamber into the boiler to realize automatic coal adding of the boiler. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 To show Figure 1 Schematic diagram of the structure of part A in . DETAILED DESCRIPTION

[0022] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings.

[0023] Reference Figure 1 As shown, an energy-saving coal feeding system for a power plant boiler includes a boiler 1, a coal mill 2, a flue gas treatment device 3, a flue gas drying device 4, a heating device 5, and a pulverizer 6.

[0024] A coal storage chamber 11 is provided on one side of the boiler 1 for storing coal powder. A coal dropping pipe 21 is provided between the coal storage chamber 11 and the coal mill 2 so that the coal mill 2 grinds the coal and delivers it into the coal storage chamber 11 through the coal dropping pipe 21 .

[0025] A pair of lower bins 7 are provided above the coal mill 2, and a feeding device 71 is provided at the bottom of the lower bins 7. In this embodiment, the feeding device preferably adopts a screw transmission method for feeding, so that the feeding device 71 feeds the coal in the lower bin 7 into the coal mill 2. The coal mill grinds the coal into carbon slag and sends it into the coal storage chamber through the coal dropping pipe.

[0026] Recombination Figure 2 As shown, a discharge pipe 22 is provided between the pulverizer 6 and the coal dropping pipe 21, and a coal screening net 21 is provided on the inner wall of the coal dropping pipe 22 below the discharge pipe 22. When the coal powder in the pulverizer 2 is fed into the coal storage chamber 11, the coal powder is screened and filtered by the coal screening net 211, so that the coal powder with larger particles is screened out and falls into the pulverizer through the discharge pipe 22 for secondary crushing.

[0027] A receiving box 61 is provided below the pulverizer 6, and a coal delivery pipe 62 is connected between the receiving box 61 and the coal mill 2. A first fan 63 is provided on the coal delivery pipe 62. The pulverized coal in the pulverizer 6 falls into the receiving box 61, so that the pulverized coal in the receiving box 61 is sent into the coal mill 2 through the coal delivery pipe 62 under the action of the first fan 63, so that the coal mill 2 continues to send the secondary pulverized coal into the coal storage chamber 11, thereby ensuring that the particle size of the pulverized coal is uniform, which is convenient for combustion in the boiler.

[0028] Reference Figure 1As shown, a smoke exhaust pipe 12 is arranged between the smoke treatment device 3 and the boiler 1, and the smoke treatment device 3 includes a treatment tank 31, a filter screen 32 is arranged in the middle of the treatment tank 31, and the air inlet of the treatment tank 31 is connected to the smoke exhaust pipe 12. There is a solution in the treatment tank 12. The hot smoke discharged by the boiler 1 enters the treatment tank 31 through the smoke exhaust pipe 12, so that the smoke dust in the hot smoke is precipitated in the solution, and the hot smoke continues to rise and is filtered by the filter screen 32 to reduce the smoke dust content in the hot smoke.

[0029] An air intake duct 33 is arranged between the flue gas drying device 4 and the flue gas treatment device 3. The flue gas drying device 4 includes a drying tower 41. The air inlet of the drying tower 41 is connected to one end of the air intake duct 33, and the other end of the air intake duct 33 is connected to the air outlet of the treatment tank 31. The drying tower in this embodiment is a conventional technology and will not be repeated again. After being filtered, the hot smoke enters the drying tower 41 through the air intake duct 31, so that the drying tower 41 removes moisture from the hot smoke, thereby generating dry flue gas.

[0030] An outlet pipe 42 is connected between one end of the heating device 5 and the drying tower 41, and a combustion-supporting pipe 51 is provided between the other end and the boiler 1. The outlet pipe 42 is provided with a second fan 421. In this embodiment, the heating device preferably adopts a preheater, and the smoke exhaust pipe 11 is connected to the heating device 5. The flue gas in the drying tower 41 enters the heating device 5 through the outlet pipe 42 under the action of the second fan 421, and the heat in the smoke exhaust pipe 12 is used to heat the flue gas, so that the heated flue gas is sent to the boiler 1 through the combustion-supporting pipe 51, thereby improving the combustion effect of the boiler and reducing the energy consumption of the boiler.

[0031] An air supply pipe 43 is arranged between the air outlet pipe 42 and the coal storage chamber 11, and a first solenoid valve 431 is arranged on the air supply pipe 43. Under the action of the second fan 431, part of the flue gas in the drying tower 41 enters the heating device 5, and the other part is sent into the coal storage chamber 11 through the air supply pipe 43. When the boiler 1 needs to add pulverized coal, the first solenoid valve 431 is opened, so that the pulverized coal in the coal storage chamber 11 is blown into the boiler 1 under the action of the air supply pipe 43, so that the combustion of the boiler is more stable.

[0032] An oxygen detection device is provided on one end of the outlet pipe 43 adjacent to the heating device 5. In this embodiment, an oxygen detector is preferably used. An air inlet pipe is provided on the outlet pipe 43, and a second solenoid valve is provided on the air inlet pipe. When the oxygen detection device detects that the oxygen content of the flue gas in the outlet pipe is too low, the second solenoid valve of the air inlet pipe controls the valve opening to increase, thereby increasing the air intake of the air inlet pipe, thereby increasing the oxygen content of the exhaust gas in the outlet pipe 43. When the oxygen detection device detects that the oxygen content of the exhaust gas in the outlet pipe 43 is too high, the second solenoid valve of the air inlet pipe 432 controls the valve opening to decrease, thereby reducing the air intake of the air inlet pipe.

[0033] Of course, the above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any modifications made according to the spirit of the main technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. An energy-saving coal-loading system for a power plant boiler, characterized in that: include: A boiler, wherein a coal storage chamber is provided on one side of the boiler for storing pulverized coal; A coal mill, wherein a coal dropping pipe is provided between the coal mill and the coal storage chamber, so that the coal mill grinds the coal and delivers the coal into the coal storage chamber through the coal dropping pipe; A pair of lower bins are provided above the coal mill for storing coal, and a feeding device is provided at the bottom of each of the lower bins so that the feeding device can feed the coal in the lower bins into the coal mill; A flue gas treatment device, wherein a flue gas exhaust pipe is provided between the flue gas treatment device and the boiler, so that the flue gas treatment device can treat the flue gas discharged by the boiler; A flue gas drying device, wherein an air intake duct is provided between the flue gas drying device and the flue gas treatment device, so that the flue gas drying device dries the flue gas in the flue gas treatment device; A heating device, wherein the exhaust pipe is connected to the heating device, an exhaust pipe is connected between one end of the heating device and the flue gas drying device, and a combustion-supporting pipe is provided between the other end of the heating device and the boiler; A pulverizer is provided with a discharge pipe between the pulverizer and the coal dropping pipe, and a coal screening net is provided on the inner wall of the coal dropping pipe below the discharge pipe. The coal screening net is used to screen coal powder, so that the coal powder that fails to pass the screening falls into the pulverizer through the discharge pipe for secondary crushing.

2. The energy-saving coal-loading system for a power plant boiler according to claim 1 is characterized in that: An air delivery pipeline is arranged between the air outlet pipeline and the coal storage chamber.

3. The energy-saving coal-loading system for a power plant boiler according to claim 1 is characterized in that: A receiving box is provided below the pulverizer, a coal delivery pipe is connected between the receiving box and the coal mill, and a first fan is provided on the coal delivery pipe. The coal powder in the pulverizer falls into the receiving box, so that the coal powder in the receiving box is delivered into the coal mill through the coal delivery pipe under the action of the first fan.

4. The energy-saving coal-loading system for a power plant boiler according to claim 2 is characterized in that: The air outlet duct is provided with a second fan.

5. The energy-saving coal-loading system for a power plant boiler according to claim 1 is characterized in that: The flue gas treatment device comprises a treatment tank, a filter screen is arranged in the middle of the treatment tank, an air outlet of the treatment tank is connected to the air inlet pipe, and an air inlet of the treatment tank is connected to the air inlet of the smoke exhaust pipe.

6. The energy-saving coal-loading system for a power plant boiler according to claim 1, characterized in that: The fume drying device comprises a drying tower, an air inlet of the drying tower is connected to the air inlet pipeline, and an air outlet of the drying tower is connected to the air outlet pipeline.

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