Raw coal bunker heating system

Abstract

The utility model relates to a raw coal bunker heating system. The raw coal bunker heating system comprises a raw coal bunker, a heating cover body, a hot air pipeline, a first adjusting valve, a hot air conveying source, a cold air pipeline, a second adjusting valve and a cold air conveying source; the heating cover is arranged around the bottom of the raw coal bunker, an inlet of the hot air pipeline communicates with a hot air conveying source, an outlet of the hot air pipeline communicates with an inlet of the heating cover, and the first adjusting valve is arranged on the hot air pipeline; an inlet of the cold air pipeline communicates with a cold air conveying source, an outlet of the cold air pipeline communicates with an inlet of the heating cover body, the second adjusting valve is arranged on the cold air pipeline, and an outlet of the heating cover body is used for communicating with a hearth of the power generation boiler. And hot air in the heating cover body is used for heating the bottom of the raw coal bunker, pulverized coal in the raw coal bunker is prevented from being damped, discharging blockage is avoided, combustion of the pulverized coal and smooth proceeding of ignition operation are facilitated, and the stability of pulverized coal discharging is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of raw coal storage, and in particular, to a raw coal bunker heating system. Background Art

[0002] Raw coal bunker refers to the storage bunker for raw coal, coal slime and other granular materials in thermal power plants. The piled raw coal has a tendency to spontaneously combust, so in the process of logistics transportation, coal yard storage, belt transportation, etc., water is sprayed on the surface to prevent or extinguish early spontaneous combustion. Therefore, the raw coal in the raw coal bunker has a large amount of moisture, which makes it easy to freeze into large blocks at low temperatures, resulting in the failure of the raw coal bunker to unload coal, blocking the coal drop pipe and affecting the operation of the equipment.

[0003] The raw coal bunker used in power plants is an important storage link in the pulverizing system of thermal power plants. The continuity of its operation is directly related to the combustion conditions of the furnace and affects the safe operation of the unit. The blockage of the raw coal bunker is mainly determined by the structure of the raw coal bunker and the quality of the coal. The blockage of the coal bunker tube will lead to material blocking and bridging in the bunker, which will in turn cause failures such as coal shortage in the coal mill. Especially in rainy weather with high air humidity, coal is prone to compaction, which is not conducive to the combustion of coal powder and the normal ignition operation.

[0004] In order to increase the fluidity of materials, the raw coal bunkers in thermal power plants are mostly shaped like inverted cones or hyperbolic cones. When the coal is not flowing smoothly, people have to use a hammer or a vibrating device, which consumes a lot of physical energy, is inefficient, and the hammer is easy to fall off and injure people, which has a serious impact on the safe and stable operation of the boiler. Utility Model Content

[0005] The purpose of the present invention is to provide a raw coal bunker heating system to solve the technical problems existing in the related art.

[0006] In order to achieve the above-mentioned object, the present disclosure provides a raw coal bunker heating system, the raw coal bunker heating system comprising a raw coal bunker, a heating cover, a hot air pipeline, a first regulating valve, a hot air delivery source, a cold air pipeline, a second regulating valve and a cold air delivery source;

[0007] The heating cover is used to be arranged around the bottom of the raw coal bin, the inlet of the hot air pipeline is connected to the hot air delivery source, the outlet of the hot air pipeline is connected to the inlet of the heating cover, and the first regulating valve is arranged on the hot air pipeline;

[0008] The inlet of the cold air pipeline is connected to the cold air delivery source, the outlet of the cold air pipeline is connected to the inlet of the heating cover, the second regulating valve is arranged on the cold air pipeline, and the outlet of the heating cover is used to communicate with the furnace of the power generation boiler.

[0009] Optionally, the raw coal bin heating system also includes a mixing pipeline, the outlet of the hot air pipeline is connected to the inlet of the mixing pipeline, the outlet of the cold air pipeline is connected to the inlet of the mixing pipeline, and the outlet of the mixing pipeline is connected to the inlet of the heating cover.

[0010] Optionally, the raw coal bunker heating system further comprises a three-way connecting valve, wherein the three-way connecting valve comprises a first valve inlet, a second valve inlet and a valve outlet;

[0011] The first valve inlet is communicated with the outlet of the hot air pipeline, the second valve inlet is communicated with the outlet of the cold air pipeline, and the valve outlet is communicated with the inlet of the mixing pipeline.

[0012] Optionally, the raw coal bunker heating system further includes a switch valve, and the switch valve is arranged in the mixing pipeline.

[0013] Optionally, the raw coal bunker heating system further includes a first temperature detection element, a second temperature detection element and a third temperature detection element;

[0014] The first temperature detecting element is arranged in the mixing pipeline and is located downstream of the switch valve, and the second temperature detecting element and the third temperature detecting element are arranged at different positions of the heating cover.

[0015] Optionally, the mixing pipeline includes a main pipeline, a first branch pipeline and a second branch pipeline;

[0016] The inlet of the main pipeline is connected with the outlet of the hot air pipeline and the outlet of the cold air pipeline, and the first temperature detection component and the switch valve are arranged on the main pipeline;

[0017] The inlet of the first branch pipeline is communicated with the outlet of the main pipeline, and the outlet of the first branch pipeline is communicated with the inlet of the heating cover;

[0018] The inlet of the second branch pipeline is communicated with the outlet of the main pipeline, and the outlet of the second branch pipeline is communicated with the inlet of the heating cover.

[0019] Optionally, the raw coal bunker comprises a raw coal bunker body, a conical bunker section and a pipe bunker section, the lower end of the raw coal bunker body is connected to the upper end of the conical bunker section, the lower end of the conical bunker section is connected to the upper end of the pipe bunker section, and the lower end of the pipe bunker section is used to communicate with the inlet of the coal feeder;

[0020] The conical bin section is tapered from top to bottom, the tube bin section extends in the up and down directions and the tube diameter is the same from top to bottom, and the heating cover is used to be arranged around the tube bin section.

[0021] Optionally, the heating cover body includes an upper cover, a lower cover and a sleeve, the upper cover is formed with a first opening for the tube bin section to pass through, the lower cover is formed with a second opening for the tube bin section to pass through, wherein the first opening is sealed with the tube bin section, the second opening is sealed with the tube bin section, and the sleeve connects the upper cover and the lower cover and is arranged around the tube bin section at intervals; wherein the inlet of the heating cover body is arranged at the lower cover, and the outlet of the heating cover body is arranged at the upper cover.

[0022] Optionally, the hot air pipeline and the cold air pipeline are both made of metal.

[0023] Optionally, the raw coal bunker heating system further includes a thermal insulation layer, and the thermal insulation layer is coated on the outer surface of the heating cover.

[0024] In the above technical solution, a hot air pipeline and a cold air pipeline are provided, and the outlets of the hot air pipeline and the cold air pipeline are both connected to the heating cover body. In addition, a first regulating valve is provided on the hot air pipeline, and a second regulating valve is provided on the cold air pipeline. By adjusting the first regulating valve and the second regulating valve, the air volume of the hot air and the air volume of the cold air can be adjusted, so that the temperature of the hot air entering the heating cover body can be adjusted to avoid the air temperature entering the heating cover body being too high or too low. Then, the hot air in the heating cover body is used to heat the bottom of the raw coal bin to prevent the coal powder inside the raw coal bin from getting damp and the material discharge being blocked, which is conducive to the smooth combustion and ignition of the coal powder and improves the stability of the coal powder discharge. In addition, the outlet of the heating cover body is used to communicate with the furnace of the power generation boiler, which can effectively recover the heat energy and avoid the waste of heat energy.

[0025] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0027] Figure 1 It is a structural schematic diagram of a raw coal bunker heating system according to an embodiment of the present invention.

[0028] Description of Reference Numerals

[0029] 1. Raw coal bunker; 11. Conical bunker section; 12. Pipe bunker section;

[0030] 2. Heating cover; 21. Upper cover; 22. Lower cover; 23. Sleeve;

[0031] 3. Hot air pipeline; 4. First regulating valve; 5. Cold air pipeline; 6. Second regulating valve;

[0032] 7. Mixing pipeline; 71. Main pipeline; 72. First branch pipeline; 73. Second branch pipeline;

[0033] 8. On-off valve; 9. First temperature detection element; 10. Second temperature detection element; 13. Third temperature detection element; 200. Coal feeder. DETAILED DESCRIPTION

[0034] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0035] Reference Figure 1 As shown, the present disclosure provides a raw coal bunker heating system, which includes a raw coal bunker 1, a heating cover 2, a hot air pipeline 3, a first regulating valve 4, a hot air delivery source, a cold air pipeline 5, a second regulating valve 6 and a cold air delivery source. The heating cover 2 is used to be arranged around the bottom of the raw coal bunker 1, the inlet of the hot air pipeline 3 is connected to the hot air delivery source, the outlet of the hot air pipeline 3 is connected to the inlet of the heating cover 2, and the first regulating valve 4 is arranged on the hot air pipeline 3. The inlet of the cold air pipeline 5 is connected to the cold air delivery source, the outlet of the cold air pipeline 5 is connected to the inlet of the heating cover 2, the second regulating valve 6 is arranged on the cold air pipeline 5, and the outlet of the heating cover 2 is used to be connected to the furnace of the power generation boiler.

[0036] In the above technical scheme, by setting the hot air pipeline 3 and the cold air pipeline 5, and the outlets of the hot air pipeline 3 and the cold air pipeline 5 are both connected with the heating cover 2, and the hot air pipeline 3 is provided with a first regulating valve 4, and the cold air pipeline 5 is provided with a second regulating valve 6. By adjusting the first regulating valve 4 and the second regulating valve 6, the air volume of the hot air and the air volume of the cold air can be adjusted, so that the temperature of the hot air entering the heating cover 2 can be adjusted to avoid the air temperature entering the heating cover 2 being too high or too low, and then the hot air in the heating cover 2 is used to heat the bottom of the raw coal bunker 1 to prevent the coal powder inside the raw coal bunker 1 from being damp and the material discharge being blocked, which is conducive to the combustion and ignition of the coal powder and improves the stability of the coal powder discharge. In addition, the outlet of the heating cover 2 is used to communicate with the furnace of the power generation boiler, which can effectively recover the heat energy and avoid the waste of heat energy.

[0037] Optionally, the above-mentioned hot air delivery source and cold air delivery source can be constructed as any appropriate structure, as long as they can deliver hot air and cold air respectively. For example, the cold air delivery source can be an air conditioning refrigerator, and the hot air delivery source can be a dryer, but the present disclosure does not limit the specific structural form of the hot air delivery source and the cold air delivery source. Alternatively, in other embodiments, the hot air delivery source can be the hot air duct of the thermal power plant itself, and the cold air delivery source can also be the cold air duct of the power plant itself, and the present disclosure does not limit this.

[0038] In one embodiment, referring to Figure 1 As shown, the raw coal bunker heating system further includes a mixing pipeline 7, the outlet of the hot air pipeline 3 is connected to the inlet of the mixing pipeline 7, the outlet of the cold air pipeline 5 is connected to the inlet of the mixing pipeline 7, and the outlet of the mixing pipeline 7 is connected to the inlet of the heating cover 2. By providing the mixing pipeline 7, it is convenient to effectively mix the hot air and the cold air, and ensure the uniformity of the temperature of the gas entering the heating cover 2.

[0039] Optionally, the raw coal bunker heating system further includes a three-way connecting valve, which includes a first valve inlet, a second valve inlet and a valve outlet; the first valve inlet is connected to the outlet of the hot air pipeline 3, the second valve inlet is connected to the outlet of the cold air pipeline 5, and the valve outlet is connected to the inlet of the mixing pipeline 7. By providing the three-way connecting valve, the connection of the hot air pipeline 3, the cold air pipeline 5 and the mixing pipeline 7 is facilitated, and the convenience of pipeline connection is improved.

[0040] In addition, the raw coal bunker heating system also includes a switch valve 8, which is arranged in the mixing pipeline 7. By arranging the switch valve 8, it is convenient to control the opening and closing of the gas flowing into the heating cover body 2, so as to facilitate the maintenance personnel to carry out maintenance work.

[0041] In another embodiment, referring to Figure 1 As shown, the raw coal bunker heating system also includes a first temperature detection component 9, a second temperature detection component 10 and a third temperature detection component 13; the first temperature detection component 9 is arranged in the mixing pipeline 7 and is located downstream of the switch valve 8, and the second temperature detection component 10 and the third temperature detection component 13 are arranged at different positions of the heating cover 2. By setting the temperature detection components, the temperature of the mixed gas can be effectively detected, which is convenient for the operator to detect the temperature of the gas in real time, so as to timely adjust the opening of the first regulating valve 4 and the second regulating valve 6, so as to adjust the temperature of the gas to meet the use requirements.

[0042] Optionally, the mixing pipeline 7 includes a main pipeline 71, a first branch pipeline 72, and a second branch pipeline 73; the inlet of the main pipeline 71 is connected to the outlet of the hot air pipeline 3 and the outlet of the cold air pipeline 5, and the first temperature detection member 9 and the switch valve 8 are arranged on the main pipeline 71; the inlet of the first branch pipeline 72 is connected to the outlet of the main pipeline 71, and the outlet of the first branch pipeline 72 is connected to the inlet of the heating cover 2; the inlet of the second branch pipeline 73 is connected to the outlet of the main pipeline 71, and the outlet of the second branch pipeline 73 is connected to the inlet of the heating cover 2. By providing the first branch pipeline 72 and the second branch pipeline 73, the gas entering the heating cover 2 can be distributed faster and more evenly, but the present disclosure does not limit the specific structure of the mixing pipeline 7.

[0043] Reference Figure 1 As shown, the raw coal bin 1 includes a raw coal bin body, a conical bin section 11 and a pipe bin section 12, the lower end of the raw coal bin body is connected to the upper end of the conical bin section 11, the lower end of the conical bin section 11 is connected to the upper end of the pipe bin section 12, and the lower end of the pipe bin section 12 is used to communicate with the inlet of the coal feeder 200; wherein, the conical bin section 11 is tapered from top to bottom, the pipe bin section 12 extends in the up and down directions and the pipe diameter is the same from top to bottom, and the heating hood 2 is used to be arranged around the pipe bin section 12.

[0044] In this embodiment, the conical bin section 11 is tapered from top to bottom, which is convenient for the raw coal to fall, and the arrangement of the pipe bin section 12 is convenient for communication with the inlet of the coal feeder 200, thereby improving the convenience of communication. The heating cover 2 is arranged around the pipe bin section 12, and can heat the raw coal to be fed into the coal feeder 200, thereby increasing the efficiency of raw coal entering the bin and effectively avoiding the occurrence of blockage of high-moisture coal.

[0045] In an alternative embodiment, referring to Figure 1 As shown, the heating cover 2 includes an upper cover 21, a lower cover 22 and a sleeve 23, the upper cover 21 is formed with a first opening for the pipe bin section 12 to pass through, the lower cover 22 is formed with a second opening for the pipe bin section 12 to pass through, wherein the first opening is sealed with the pipe bin section 12, the second opening is sealed with the pipe bin section 12, the sleeve 23 connects the upper cover 21 and the lower cover 22 and is arranged around the pipe bin section 12 at intervals; wherein the inlet of the heating cover 2 is arranged at the lower cover 22, and the outlet of the heating cover 2 is arranged at the upper cover 21. The heating cover 2 has a simple structure and is easy to arrange and install, but the present disclosure does not limit the specific structure of the heating cover 2, and it can be constructed in any appropriate shape and structure.

[0046] In addition, the hot air duct 3 and the cold air duct 5 are both made of metal materials to improve strength and service life. However, the present disclosure does not limit the specific materials of the hot air duct 3 and the cold air duct 5.

[0047] In addition, the raw coal bunker heating system may further include an insulation layer, which is coated on the outer surface of the heating cover 2 to ensure the stability of the temperature inside the heating cover 2 and avoid the inability to achieve the heating effect due to excessive temperature loss. For example, the insulation layer may be insulation asbestos, but the present disclosure does not limit the specific material of the insulation layer.

[0048] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0049] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0050] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A raw coal bunker heating system, characterized in that: The raw coal bunker heating system comprises a raw coal bunker, a heating cover, a hot air pipeline, a first regulating valve, a hot air delivery source, a cold air pipeline, a second regulating valve and a cold air delivery source; The heating cover is used to be arranged around the bottom of the raw coal bin, the inlet of the hot air pipeline is connected to the hot air delivery source, the outlet of the hot air pipeline is connected to the inlet of the heating cover, and the first regulating valve is arranged on the hot air pipeline; The inlet of the cold air pipeline is connected to the cold air delivery source, the outlet of the cold air pipeline is connected to the inlet of the heating cover, the second regulating valve is arranged on the cold air pipeline, and the outlet of the heating cover is used to communicate with the furnace of the power generation boiler.

2. The raw coal bunker heating system according to claim 1, characterized in that: The raw coal bunker heating system also includes a mixing pipeline, the outlet of the hot air pipeline is connected to the inlet of the mixing pipeline, the outlet of the cold air pipeline is connected to the inlet of the mixing pipeline, and the outlet of the mixing pipeline is connected to the inlet of the heating cover.

3. The raw coal bunker heating system according to claim 2, characterized in that: The raw coal bunker heating system further comprises a three-way connecting valve, wherein the three-way connecting valve comprises a first valve inlet, a second valve inlet and a valve outlet; The first valve inlet is communicated with the outlet of the hot air pipeline, the second valve inlet is communicated with the outlet of the cold air pipeline, and the valve outlet is communicated with the inlet of the mixing pipeline.

4. The raw coal bunker heating system according to claim 2, characterized in that: The raw coal bunker heating system also includes a switch valve, which is arranged in the mixing pipeline.

5. The raw coal bunker heating system according to claim 4, characterized in that: The raw coal bunker heating system also includes a first temperature detection element, a second temperature detection element and a third temperature detection element; The first temperature detecting element is arranged in the mixing pipeline and is located downstream of the switch valve, and the second temperature detecting element and the third temperature detecting element are arranged at different positions of the heating cover.

6. The raw coal bunker heating system according to claim 5, characterized in that: The mixing pipeline includes a main pipeline, a first branch pipeline and a second branch pipeline; The inlet of the main pipeline is connected with the outlet of the hot air pipeline and the outlet of the cold air pipeline, and the first temperature detection component and the switch valve are arranged on the main pipeline; The inlet of the first branch pipeline is communicated with the outlet of the main pipeline, and the outlet of the first branch pipeline is communicated with the inlet of the heating cover; The inlet of the second branch pipeline is communicated with the outlet of the main pipeline, and the outlet of the second branch pipeline is communicated with the inlet of the heating cover.

7. The raw coal bunker heating system according to any one of claims 1 to 6, characterized in that: The raw coal bunker comprises a raw coal bunker body, a conical bunker section and a pipe bunker section, the lower end of the raw coal bunker body is connected to the upper end of the conical bunker section, the lower end of the conical bunker section is connected to the upper end of the pipe bunker section, and the lower end of the pipe bunker section is used to communicate with the inlet of the coal feeder; The conical bin section is tapered from top to bottom, the tube bin section extends in the up and down directions and the tube diameter is the same from top to bottom, and the heating cover is used to be arranged around the tube bin section.

8. The raw coal bunker heating system according to claim 7, characterized in that: The heating cover body includes an upper cover, a lower cover and a sleeve, the upper cover is formed with a first opening for the tube storehouse section to pass through, the lower cover is formed with a second opening for the tube storehouse section to pass through, wherein the first opening is sealed with the tube storehouse section, the second opening is sealed with the tube storehouse section, the sleeve connects the upper cover and the lower cover and is arranged around the tube storehouse section at intervals; wherein the inlet of the heating cover body is arranged at the lower cover, and the outlet of the heating cover body is arranged at the upper cover.

9. The raw coal bunker heating system according to any one of claims 1 to 6, characterized in that: The hot air pipeline and the cold air pipeline are both made of metal material.

10. The raw coal bunker heating system according to any one of claims 1 to 6, characterized in that: The raw coal bunker heating system also includes a heat-insulating layer, which is coated on the outer surface of the heating cover.

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