Energy-saving coal mill hot air taking system

Abstract

The utility model relates to the technical field of waste heat recycling, and discloses an energy-saving coal mill hot air taking system which comprises a bottom plate, a coal mill, a grate cooler, a kiln head dust collector and an AQC waste heat boiler are arranged at the top end of the bottom plate, a cyclone dust collector is arranged at the top end of the grate cooler, and a temperature detector for monitoring the internal temperature of the coal mill is arranged at the top end of the coal mill. A high-temperature opening and a low-temperature opening are formed in the top end of the grate cooler. High-temperature air and low-temperature air of a grate cooler are coordinated through a DCS central control center to synchronously take air, the high-temperature air is directly used for waste heat power generation of a coal mill, the low-temperature air is used for adjusting the temperature of entering the mill, and a gradient utilization mode of high-temperature power generation and low-temperature temperature adjustment is formed. The system can dynamically adjust the opening degrees of the first control valve, the third control valve and the fourth control valve, and the inlet temperature of the coal mill is accurately controlled within the range of 230-250 DEG C. And when the temperature is abnormal, an emergency protection mechanism is automatically started to ensure stable operation of the system.

Description

Technical Field

[0001] This utility model relates to the field of waste heat recovery and utilization technology, specifically to an energy-saving coal mill hot air intake system. Background Technology

[0002] In traditional industrial production processes, the efficiency of the coordinated operation of the kiln head waste heat power generation system and the coal mill system, as important links in heat energy utilization, directly affects the energy consumption and economic benefits of the entire production line. However, in existing technical solutions, a "wind competition" phenomenon generally exists between the kiln head waste heat power generation system and the coal mill system, and this contradiction seriously restricts the overall energy efficiency and stability of the system.

[0003] Specifically, in existing technologies, the hot air inlet for the coal mill is typically located separately in the high-temperature section of the cooler, close to the hot air duct leading to the AQC (Air Quenching Cooler) waste heat boiler. Because this hot air duct has a large diameter, the coal mill's exhaust fan often struggles to effectively extract the required hot air during waste heat power generation system operation. A large amount of high-temperature hot air, due to its lower negative pressure, preferentially flows to the larger-diameter waste heat power generation duct, causing the coal mill system to malfunction due to insufficient hot air supply, thus affecting the efficiency and quality of pulverized coal preparation.

[0004] On the other hand, when the waste heat power generation system is not operating, although high-temperature hot air continues to be generated, the coal mill system has strict requirements for the temperature of the air entering the mill, which usually needs to be controlled at around 250°C. At this time, in order to meet the air volume and temperature requirements of the coal mill system, operators have to frequently adjust the valves on the hot air ducts and open the cold air valves to supplement the air supply. However, this adjustment method not only increases the complexity and labor intensity of operation, but also significantly increases the system's energy consumption and reduces energy utilization efficiency due to the large amount of cold air mixed in, thus violating the original intention of energy conservation and emission reduction. Furthermore, existing technology cannot respond in real time to changes in the high-temperature and low-temperature air parameters of the grate cooler, making it difficult to ensure stable air intake quality and potentially leading to energy waste due to air intake deviations. Utility Model Content

[0005] The purpose of this utility model is to provide an energy-saving coal mill hot air intake system, which coordinates the synchronous intake of high-temperature air and low-temperature air from the grate cooler through the DCS central control center. The high-temperature air is directly used for waste heat power generation in the coal mill, and the low-temperature air is used to regulate the temperature entering the mill, forming a cascade utilization mode of "high-temperature power generation + low-temperature temperature regulation".

[0006] To achieve the above objectives, this utility model provides the following technical solution: an energy-saving coal mill hot air intake system, including a base plate, a coal mill, a grate cooler, a kiln head dust collector, and an AQC waste heat boiler are installed at the top of the base plate, a cyclone dust collector is installed at the top of the grate cooler, a temperature detector for monitoring the internal temperature of the coal mill is installed at the top of the coal mill, and a high-temperature port and a low-temperature port are opened at the top of the grate cooler.

[0007] A hot air extraction component for taking in high-temperature gas is provided outside the high-temperature port. The hot air extraction component includes a first connecting pipe, and a first control valve is provided outside the first connecting pipe to adjust the air intake according to the temperature in the coal mill.

[0008] A low-temperature air intake component is provided outside the low-temperature port to draw in low-temperature gas. The low-temperature air intake component includes a fourth connecting pipe, and a fourth control valve is provided outside the fourth connecting pipe to adjust the air intake volume.

[0009] Preferably, the hot air extraction component includes a second connecting pipe disposed outside the first connecting pipe, the second connecting pipe being connected to a cyclone dust collector, an air inlet pipe disposed outside the cyclone dust collector, the air inlet pipe being connected to the inside of the coal mill, an exhaust pipe being connected outside the air inlet pipe, and a second control valve disposed outside the exhaust pipe.

[0010] Preferably, a third connecting pipe is connected to the outside of the first connecting pipe, a third control valve is provided outside the third connecting pipe, and the end of the third connecting pipe away from the first connecting pipe is connected to the AQC waste heat boiler.

[0011] Preferably, the fourth connecting pipe is connected to the second connecting pipe on the side away from the low-temperature port.

[0012] Preferably, the low-temperature air extraction component includes a fifth connecting pipe disposed outside the fourth connecting pipe, a fifth control valve for controlling the opening and closing of the fifth connecting pipe is disposed outside the fifth connecting pipe, and a connecting pipe is connected to the side of the fifth connecting pipe away from the fourth connecting pipe.

[0013] The two ends of the connecting pipe are connected to the kiln head dust collector and the AQC waste heat boiler.

[0014] Preferably, a ventilator is also provided outside the coal mill, and a DCS control center is provided at the top of the base plate to control the progress of the hot air extraction component and the low temperature air extraction component.

[0015] Preferably, both the high-temperature port and the low-temperature port are provided with an air intake adjustment component for fine-tuning the air intake position. The air intake adjustment component includes two sets of storage frames symmetrically arranged in the high-temperature port and the low-temperature port. Each set of storage frames has a sliding plate, and a connecting plate is fixed between the two sets of sliding plates. An air intake pipe is provided in the connecting plate.

[0016] The air intake pipe in the high-temperature port is connected to the first connecting pipe.

[0017] The air intake pipe in the low-temperature port is connected to the fourth connecting pipe.

[0018] Preferably, the air intake adjustment assembly includes two sets of fixed frames installed at the top of the grate cooler, and each set of fixed frames is equipped with multiple telescopic rods.

[0019] The output end of the multi-stage telescopic rod located next to the high-temperature port is fixedly connected to the air intake pipe in the high-temperature port.

[0020] The output end of the multi-stage telescopic rod located next to the low-temperature port is fixedly connected to the air intake pipe in the low-temperature port.

[0021] Compared with the prior art, this utility model provides an energy-saving coal mill hot air intake system, which has the following beneficial effects:

[0022] 1. This energy-saving coal mill hot air intake system coordinates the simultaneous intake of high-temperature and low-temperature air from the grate cooler via the DCS central control center. The high-temperature air is directly used for waste heat power generation in the coal mill, while the low-temperature air is used to regulate the inlet temperature, forming a tiered utilization mode of "high-temperature power generation + low-temperature temperature regulation." This design avoids energy loss caused by the mixing of cold air, and simultaneously introduces the low-temperature air from the AQC waste heat boiler into the kiln head dust collector, achieving efficient integration of waste heat resources throughout the system. Based on real-time feedback from temperature detectors, the system can dynamically adjust the opening of the first, third, and fourth control valves to precisely control the coal mill inlet temperature within the range of 230℃–250℃. When the temperature is abnormal, an emergency protection mechanism is automatically activated (such as opening the second control valve) to ensure stable system operation.

[0023] 2. This energy-saving coal mill hot air intake system uses a multi-stage telescopic rod to drive the intake pipe, combined with the sliding of the slide plate within the storage frame, to achieve fine-tuning of the intake position. This allows the system to respond in real time to changes in the high-temperature and low-temperature air parameters of the grate cooler, ensuring stable air intake quality and avoiding energy waste due to intake deviations. For example, when the high-temperature airflow decreases, the system can automatically adjust the intake point to a more efficient area, maintaining waste heat power generation efficiency. The double slide plate structure forms a double sealing barrier, effectively preventing leakage of high-temperature and low-temperature air during the intake process. This design not only reduces heat loss but also avoids safety hazards caused by gas leaks. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the three-dimensional structure of an energy-saving coal mill hot air intake system according to the present invention. Figure 1 .

[0025] Figure 2 This is a schematic diagram of the three-dimensional structure of an energy-saving coal mill hot air intake system according to the present invention. Figure 2 .

[0026] Figure 3 This is a partial three-dimensional structural diagram of an energy-saving coal mill hot air intake system according to the present invention. Figure 1 .

[0027] Figure 4 This is a partial three-dimensional structural diagram of an energy-saving coal mill hot air intake system according to the present invention. Figure 2 .

[0028] Figure 5 This is a three-dimensional structural diagram of the air intake adjustment component in an energy-saving coal mill hot air intake system according to the present invention.

[0029] Figure 6 This is a schematic diagram showing the disassembled structure of the air intake adjustment component in an energy-saving coal mill hot air intake system according to this utility model.

[0030] In the diagram: 1. Base plate; 2. Coal mill; 21. Ventilator; 22. Temperature detector; 3. Grate cooler; 31. High-temperature inlet; 32. Low-temperature inlet; 41. Kiln head dust collector; 42. Cyclone dust collector; 5. AQC waste heat boiler; 6. Air intake adjustment assembly; 61. Storage frame; 62. Slide plate; 63. Connecting plate; 64. Air intake pipe; 65. Fixing frame; 66. Multi-stage telescopic rod; 7. Hot air extraction assembly; 71. First connecting pipe; 72. First control valve; 73. Second connecting pipe; 74. Air inlet pipe; 75. Exhaust pipe; 76. Second control valve; 77. Third connecting pipe; 78. Third control valve; 8. Low-temperature air extraction assembly; 81. Fourth connecting pipe; 82. Fourth control valve; 83. Fifth connecting pipe; 84. Fifth control valve; 85. Connecting pipe; 9. DCS central control center. Detailed Implementation

[0031] To further understand the features, technical means, and specific objectives and functions achieved by this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific embodiments.

[0032] Example 1: Please refer to Figures 1-5 This utility model provides a technical solution: an energy-saving coal mill hot air intake system, including a base plate 1, a coal mill 2, a grate cooler 3, a kiln head dust collector 41 and an AQC waste heat boiler 5 are arranged at the top of the base plate 1, a cyclone dust collector 42 is arranged at the top of the grate cooler 3, a temperature detector 22 is arranged at the top of the coal mill 2 to monitor the internal temperature of the coal mill 2, and a high temperature port 31 and a low temperature port 32 are opened at the top of the grate cooler 3.

[0033] A hot air extraction component 7 is installed outside the high-temperature port 31 to extract high-temperature gas. The hot air extraction component 7 includes a first connecting pipe 71, and a first control valve 72 is installed outside the first connecting pipe 71 to adjust the air extraction volume according to the temperature inside the coal mill 2. By adjusting the first control valve 72, the system can adjust the high-temperature air extraction volume in real time according to the internal temperature of the coal mill 2, ensuring maximum waste heat power generation efficiency while avoiding energy waste.

[0034] A low-temperature air intake assembly 8 is installed outside the low-temperature port 32 to draw in low-temperature gas. The low-temperature air intake assembly 8 includes a fourth connecting pipe 81, and a fourth control valve 82 is installed outside the fourth connecting pipe 81 to adjust the air intake volume. The fourth control valve 82 allows the air intake volume of the low-temperature air to be flexibly adjusted to meet the internal temperature regulation needs of the coal mill 2, thereby improving the stability and energy efficiency of the system operation.

[0035] Furthermore, the hot air extraction component 7 includes a second connecting pipe 73 disposed outside the first connecting pipe 71. The second connecting pipe 73 is connected to the cyclone dust collector 42. An air inlet pipe 74 is also disposed outside the cyclone dust collector 42, and the air inlet pipe 74 is connected to the inside of the coal mill 2. An exhaust pipe 75 is connected outside the air inlet pipe 74, and a second control valve 76 is disposed outside the exhaust pipe 75. The connection design between the second connecting pipe 73 and the cyclone dust collector 42, combined with the precise control of the second control valve 76, achieves effective circulation and purification of the gas inside the coal mill 2, improving the environmental performance of the system.

[0036] Furthermore, a third connecting pipe 77 is connected to the outside of the first connecting pipe 71, and a third control valve 78 is installed outside the third connecting pipe 77. The end of the third connecting pipe 77 away from the first connecting pipe 71 is connected to the AQC waste heat boiler 5. The installation of the third connecting pipe 77 and the third control valve 78 allows high-temperature air to be directly delivered to the AQC waste heat boiler 5 for waste heat power generation, improving energy utilization efficiency and reducing energy consumption.

[0037] Furthermore, the fourth connecting pipe 81, on the side furthest from the low-temperature port 32, is connected to the second connecting pipe 73. This connection between the fourth connecting pipe 81 and the second connecting pipe 73 enables the connection between the low-temperature air and the cyclone dust collector 42, providing a more flexible and efficient solution for regulating the internal temperature of the coal mill 2.

[0038] Furthermore, the low-temperature air extraction component 8 includes a fifth connecting pipe 83 located outside the fourth connecting pipe 81. A fifth control valve 84 is installed outside the fifth connecting pipe 83 to control its opening and closing. A connecting pipe 85 is connected to the side of the fifth connecting pipe 83 away from the fourth connecting pipe 81. Both ends of the connecting pipe 85 are connected to the kiln head dust collector 41 and the AQC waste heat boiler 5. The arrangement of the fifth connecting pipe 83 and the connecting pipe 85 allows the low-temperature air to be flexibly allocated to the kiln head dust collector 41 and the AQC waste heat boiler 5, realizing the efficient integration and utilization of waste heat resources throughout the system.

[0039] Furthermore, a ventilation fan 21 is installed outside the coal mill 2, and a DCS control center 9 is installed at the top of the base plate 1 to control the progress of the hot air extraction component 7 and the low-temperature air extraction component 8. The DCS control center 9 enables centralized control and coordination of the hot air extraction component 7 and the low-temperature air extraction component 8, improves the system's automation level and operating efficiency, and reduces manual intervention and maintenance costs.

[0040] Example 2: Please refer to Figures 5-6 Furthermore, in conjunction with Embodiment 1, both the high-temperature port 31 and the low-temperature port 32 are equipped with air intake adjustment components 6 for fine-tuning the air intake position. Each air intake adjustment component 6 includes two sets of storage frames 61 symmetrically arranged in the high-temperature port 31 and the low-temperature port 32. Each set of storage frames 61 has a sliding plate 62, and a connecting plate 63 is fixed between the two sets of sliding plates 62. An air intake pipe 64 is provided in the connecting plate 63. The air intake pipe 64 in the high-temperature port 31 is connected to the first connecting pipe 71. The air intake pipe 64 in the low-temperature port 32 is connected to the fourth connecting pipe 81. The air intake adjustment component 6 allows the air intake position to be fine-tuned according to changes in the high-temperature and low-temperature air parameters of the grate cooler 3, ensuring stable air intake quality and avoiding energy waste caused by air intake deviation.

[0041] Furthermore, the air intake adjustment component 6 includes two sets of fixed brackets 65 mounted on the top of the grate cooler 3, each set of fixed brackets 65 containing multi-stage telescopic rods 66. The output end of the multi-stage telescopic rod 66 located beside the high-temperature port 31 is fixedly connected to the air intake pipe 64 in the high-temperature port 31. The output end of the multi-stage telescopic rod 66 located beside the low-temperature port 32 is fixedly connected to the air intake pipe 64 in the low-temperature port 32. The multi-stage telescopic rods 66 allow the air intake pipe 64 to extend and retract flexibly, responding in real time to changes in the high-temperature and low-temperature air parameters of the grate cooler 3, ensuring air intake quality. At the same time, the double sliding plate structure 62 forms a double sealing barrier, effectively preventing leakage of high-temperature and low-temperature air during the air intake process, reducing heat loss and safety hazards.

[0042] In actual operation, when the coal mill 2, grate cooler 3, and AQC waste heat boiler 5 are running simultaneously, the first control valve 72 and the fourth control valve 82 are opened simultaneously by the DCS central control center 9 to draw air synchronously from the high-temperature port 31 and the low-temperature port 32 of the grate cooler 3. The second control valve 76 remains normally closed.

[0043] By adjusting the opening and closing degrees of the first control valve 72 and the fourth control valve 82, high-temperature gas and low-temperature gas are extracted from the grate cooler 3 through the first connecting pipe 71 and the fourth connecting pipe 81, and the gas volume and temperature entering the coal mill 2 are regulated by the cyclone dust collector 42. The dust-removed gas enters the coal mill 2 through the air inlet pipe 74.

[0044] When temperature detector 22 detects that the inlet hot air temperature of coal mill 2 is >250℃: reduce the opening of the fourth control valve 82 and increase the low-temperature air extraction rate. Adjust the temperature in coal mill 2 to 230℃-250℃.

[0045] When the inlet hot air temperature is <230℃: increase the opening of the first control valve 72 and the third control valve 78 to increase the high-temperature air volume, and at the same time decrease the opening of the fourth control valve 82 to reduce the low-temperature air volume and ensure the temperature in coal mill 2.

[0046] When the system experiences an emergency failure or the inlet air temperature exceeds 260℃: the DCS central control center 9 automatically opens the second control valve 76 to maintain system balance.

[0047] The low-temperature air from the AQC waste heat boiler 5 enters the kiln head dust collector 41 through the connecting pipe 85. The air volume of the waste air in the low-temperature section of the grate cooler 3 can be dynamically adjusted by the DCS central control center 9. The waste air is discharged through the fifth connecting pipe 83 by adjusting the opening and closing degree of the fifth control valve 84, and finally enters the kiln head dust collector 41 for treatment through the connecting pipe 85.

[0048] When the high-temperature and low-temperature air parameters of the grate cooler 3 change: the DCS central control center 9 controls the multi-stage telescopic rod 66 to push / pull the air intake pipe 64, so that the sliding plate 62 slides in the storage frame 61, thereby achieving fine adjustment of the air intake position. Furthermore, the double sliding plate 62 structure prevents leakage of high-temperature / low-temperature air.

[0049] The above embodiments only illustrate one or more implementations of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the appended claims.

Claims

1. An energy-saving coal mill hot air intake system, comprising a base plate (1), wherein a coal mill (2), a grate cooler (3), a kiln head dust collector (41), and an AQC waste heat boiler (5) are disposed at the top of the base plate (1), and a cyclone dust collector (42) is disposed at the top of the grate cooler (3), characterized in that: The top of the coal mill (2) is equipped with a temperature detector (22) to monitor the internal temperature of the coal mill (2), and the top of the grate cooler (3) is provided with a high temperature port (31) and a low temperature port (32). A hot air extraction component (7) for taking in high-temperature gas is provided outside the high-temperature port (31). The hot air extraction component (7) includes a first connecting pipe (71). A first control valve (72) is provided outside the first connecting pipe (71) to adjust the air intake according to the temperature in the coal mill (2). A low-temperature air intake assembly (8) for taking in low-temperature gas is provided outside the low-temperature port (32). The low-temperature air intake assembly (8) includes a fourth connecting pipe (81). A fourth control valve (82) for adjusting the air intake volume is provided outside the fourth connecting pipe (81).

2. The energy-saving coal mill hot air intake system according to claim 1, characterized in that: The hot air extraction component (7) includes a second connecting pipe (73) disposed outside the first connecting pipe (71). The second connecting pipe (73) is connected to the cyclone dust collector (42). An air inlet pipe (74) is also disposed outside the cyclone dust collector (42). The air inlet pipe (74) is connected to the inside of the coal mill (2). An exhaust pipe (75) is connected outside the air inlet pipe (74). A second control valve (76) is disposed outside the exhaust pipe (75).

3. The energy-saving coal mill hot air intake system according to claim 2, characterized in that: A third connecting pipe (77) is connected to the outside of the first connecting pipe (71). A third control valve (78) is provided outside the third connecting pipe (77), and the end of the third connecting pipe (77) away from the first connecting pipe (71) is connected to the AQC waste heat boiler (5).

4. The energy-saving coal mill hot air intake system according to claim 1, characterized in that: The fourth connecting pipe (81) is connected to the second connecting pipe (73) on the side away from the low temperature port (32).

5. The energy-saving coal mill hot air intake system according to claim 1, characterized in that: The low-temperature air extraction component (8) includes a fifth connecting pipe (83) disposed outside the fourth connecting pipe (81), and a fifth control valve (84) for controlling the opening and closing of the fifth connecting pipe (83) is disposed outside the fifth connecting pipe (83). A connecting pipe (85) is connected to the side of the fifth connecting pipe (83) away from the fourth connecting pipe (81). The two ends of the connecting pipe (85) are connected to the kiln head dust collector (41) and the AQC waste heat boiler (5).

6. The energy-saving coal mill hot air intake system according to claim 1, characterized in that: The coal mill (2) is also equipped with a ventilator (21), and the top of the base plate (1) is equipped with a DCS control center (9) that controls the progress of the hot air extraction component (7) and the low temperature air extraction component (8).

7. The energy-saving coal mill hot air intake system according to claim 1, characterized in that: Both the high-temperature port (31) and the low-temperature port (32) are equipped with air intake adjustment components (6) for fine-tuning the air intake position. The air intake adjustment components (6) include two sets of storage frames (61) symmetrically arranged in the high-temperature port (31) and the low-temperature port (32). Each set of storage frames (61) has a sliding plate (62) slidably arranged in it. A connecting plate (63) is fixed between the two sets of sliding plates (62). An air intake pipe (64) is arranged in the connecting plate (63). The air intake pipe (64) located in the high temperature port (31) is connected to the first connecting pipe (71); The air intake pipe (64) located in the low temperature port (32) is connected to the fourth connecting pipe (81).

8. The energy-saving coal mill hot air intake system according to claim 7, characterized in that: The air intake adjustment component (6) includes two sets of fixed frames (65) set at the top of the grate cooler (3), and each set of fixed frames (65) is provided with multi-stage telescopic rods (66); The output end of the multi-stage telescopic rod (66) located next to the high temperature port (31) is fixedly connected to the air intake pipe (64) in the high temperature port (31); The output end of the multi-stage telescopic rod (66) located next to the low temperature port (32) is fixedly connected to the air intake pipe (64) in the low temperature port (32).

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