Energy-saving control device of primary air system

Abstract

The utility model discloses a primary air system energy-saving control device which comprises a main body, a cold air duct and a hot air duct, the cold air duct and the hot air duct are connected with the main body, a heat exchange cavity and an installation cavity are formed in the main body through a partition plate, a movable pipe is installed at the center of the partition plate by forming a through hole, and a heat insulation sleeve is arranged on the outer side of the middle of the movable pipe. The heat insulation sleeve is slidably connected with the partition plate, first sleeves are arranged in the heat exchange cavity and the mounting cavity correspondingly, the connecting mechanism is connected with the two ends of the movable pipe, and an adjusting assembly connected with the heat insulation sleeve is arranged in the mounting cavity. The temperature and the flow of air in the conveying pipe are monitored through the detection box, the control box regulates and controls the inserting plate and the stepping motor according to monitoring data, then the temperature and the flow of the air can be quickly and effectively regulated, primary air can be conveniently regulated and controlled, and the operation stability of a unit is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field related to energy conservation and emission reduction in power stations, and particularly relates to an energy-saving control device for a primary air system. Background Technique

[0002] The regulation of the primary air volume directly affects the combustion performance of the furnace and plays a crucial role in the safe, stable, and economic operation of the entire unit. If the inlet air volume is too low, it may cause blockage of the pulverized coal pipe or blockage of the coal mill, and in severe cases, even lead to an explosion of the coal pulverizing system; if the inlet air volume is too high, it will reduce the pulverized coal concentration. Especially when the unit is operating at low load, it may cause unstable combustion, and it will also exacerbate the wear of the elbows of the pulverized coal pipe. Therefore, reasonably and accurately controlling the primary air system is crucial for ensuring the safe and stable operation of the unit.

[0003] Existing control devices for primary air systems usually include a cold air duct and a hot air duct, and adjustable baffles are installed in these ducts. Temperature measuring elements are generally provided at the outlets of the hot air duct and the main duct, and a flow monitoring element is also provided at the outlet of the main duct. Through these monitoring elements, the system can monitor the outlet air volume and temperature in real time and control the air volume and temperature by adjusting the baffles. However, in the actual operation process, the existing system has the following deficiencies: during the adjustment process, due to the frequent operation of the cold and hot air baffles, the change of the air flow field is large and irregular, resulting in insufficient accuracy of the air volume adjustment, making the actual air volume inconsistent with the set value and affecting the combustion stability; the action of the cold and hot air baffles lags behind, making it difficult to quickly adapt to the change of the boiler load and affecting the overall operation efficiency of the system; the current system's control of air volume and temperature depends on the monitoring data at the outlet, making it difficult to achieve real-time precise control and resulting in the combustion performance of the boiler being difficult to reach the optimal state. Summary of the Invention

[0004] The purpose of the utility model is to provide an energy-saving control device for a primary air system to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solution: an energy-saving control device for a primary air system, including a main body and a cold air duct and a hot air duct connected to the main body, wherein:

[0006] An inner part of the main body is provided with a heat exchange chamber and an installation chamber through a partition board. A movable pipe is installed at the center of the partition board by opening a through hole. A heat insulation sleeve is arranged on the outer side of the middle part of the movable pipe. The heat insulation sleeve is slidably connected with the partition board. A first sleeve, a connecting mechanism are respectively arranged in the heat exchange chamber and the installation chamber and are connected to both ends of the movable pipe. An adjusting component connected to the heat insulation sleeve is arranged inside the installation chamber. A conveying pipe and an exhaust pipe are also arranged outside the main body;

[0007] The cold air duct and the conveying pipe are respectively communicated with the first sleeve and the connecting mechanism;

[0008] The hot air duct and the exhaust pipe are both communicated with the inside of the heat exchange chamber;

[0009] It further includes a detection box, and the detection box is arranged at the connection of the conveying pipe and the connecting mechanism;

[0010] It further includes a control box, the control is installed on the outer side of the main body, and the control box is connected to the detection box and the adjustment component.

[0011] Preferably, an adjustment baffle for adjusting the flow rate is installed at the port of the cold air duct, and the adjustment baffle is electrically connected to the control box through a wire.

[0012] Preferably, the adjustment component includes a stepping motor arranged outside the main body, a lead screw and a guide rod arranged in parallel in the installation cavity. One end of the lead screw is connected to the output shaft of the stepping motor. An adjustment plate is arranged outside the lead screw and the guide rod, and the adjustment plate is fixedly connected to the heat insulation sleeve.

[0013] Preferably, the first sleeve is sleeved on the outer side of the end of the movable pipe, and a first sealing ring is arranged on the inner wall of the end of the first sleeve.

[0014] Preferably, a temperature sensor and a flow sensor are arranged on the detection box. The detection probes of the temperature sensor and the flow sensor are both placed inside the detection box, and the temperature sensor and the flow sensor are both electrically connected to the control box through wires.

[0015] Preferably, a coal mill is connected to the end of the conveying pipe away from the main body.

[0016] Preferably, the connecting mechanism includes a first mounting plate, a second mounting plate, several conduits and a second sleeve. The first mounting plate is arranged on the inner wall of the heat exchange chamber, the second mounting plate is arranged at the end of the movable pipe, several conduits are arranged on one side surface of the second mounting plate, the second sleeve is arranged on the surface of the first mounting plate, and the second sleeve corresponds to the conduit one by one.

[0017] Preferably, several second sleeves are communicated with the conveying pipe through a first cavity inside the first mounting plate, and several conduits are communicated with the movable pipe through a second cavity inside the second mounting plate.

[0018] Preferably, the port of the second sleeve is sleeved on the outer side of one end of the conduit, and a second sealing ring is arranged on the inner wall of the port of the second sleeve.

[0019] Preferably, a heat preservation lining is arranged on the inner wall of the heat exchange chamber and on the side surface of the partition facing the heat exchange chamber.

[0020] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0021] 1. By arranging a detection box and a control box on the main body, electrically connecting the temperature sensor and the flow sensor of the detection box to the control box, and connecting the control box to the stepping motor and the adjusting baffle, during the use process, the temperature and flow of the air in the conveying pipe are monitored by the detection box, and the control box adjusts the plug board and the stepping motor respectively according to the monitored data, effectively improving the stability of the unit operation.

[0022] 2. By arranging a heat exchange cavity and an installation cavity inside the main body, arranging an adjusting component inside the installation cavity, and connecting the cold air duct and the conveying pipe through a movable pipe and a connecting mechanism, during the actual use process, the cold air is heated through heat exchange in the heat exchange cavity, and subsequently, only the temperature and flow of the air in the conveying pipe need to be measured, and the adjusting baffle of the cold air duct and the stepping motor of the adjusting component can be controlled through the control box to achieve adjustment, avoiding the situation that the traditional control device frequently controls the baffles of the cold air duct and the hot air duct respectively, resulting in changes in air pressure and inaccurate actual air volume.

[0023] 3. Through the precise control of the air volume and air temperature, the stable air volume adjustment makes the combustion of the unit more stable under low load, further ensuring the safe and stable operation of the entire system. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic structural diagram of the whole of the present utility model;

[0025] Figure 2 It is a schematic structural diagram of the connecting mechanism of the present utility model;

[0026] Figure 3 It is a schematic installation diagram of the second sealing ring of the present utility model.

[0027] In the figure: 1. Main body; 2. Cold air duct; 3. Hot air duct; 4. Partition board; 5. Heat exchange cavity; 6. Installation cavity; 7. Movable pipe; 8. Heat insulation sleeve; 9. First sleeve; 10. Conveying pipe; 11. Exhaust pipe; 12. Detection box; 13. Control box; 14. Adjusting baffle; 15. Stepping motor; 16. Lead screw; 17. Guide rod; 18. Adjusting plate; 19. First sealing ring; 20. Temperature sensor; 21. Flow sensor; 22. First mounting plate; 23. Second mounting plate; 24. Duct; 25. Second sleeve; 26. Second sealing ring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0029] Please refer to Figures 1 - 3 , the present invention provides a technical solution: an energy-saving control device for a primary air system, including a main body 1 and a cold air duct 2 and a hot air duct 3 connected to the main body 1, where:

[0030] Inside the main body 1, a heat exchange chamber 5 and an installation chamber 6 are arranged through a partition 4. A movable pipe 7 is installed at the center of the partition 4 by opening a through hole. An insulating sleeve 8 is arranged on the outer side of the middle part of the movable pipe 7. The insulating sleeve 8 is slidably connected to the partition 4. The inner parts of the heat exchange chamber 5 and the installation chamber 6 are respectively provided with a first sleeve 9, a connection mechanism and the two ends of the movable pipe 7 are connected. An adjustment component connected to the insulating sleeve 8 is arranged inside the installation chamber 6. A delivery pipe 10 and an exhaust pipe 11 are also arranged outside the main body 1;

[0031] The cold air duct 2 and the delivery pipe 10 are respectively communicated with the first sleeve 9 and the connection mechanism;

[0032] The hot air duct 3 and the exhaust pipe 11 are both communicated with the inside of the heat exchange chamber 5;

[0033] It further includes a detection box 12, and the detection box 12 is arranged at the connection part of the delivery pipe 10 and the connection mechanism;

[0034] It further includes a control box 13, and the control box is installed on one side outside the main body 1. The control box 13 is connected to the detection box 12 and the adjustment component.

[0035] An adjustment baffle 14 for adjusting the flow rate is installed at the port of the cold air duct 2. The adjustment baffle 14 is electrically connected to the control box 13 through a wire, specifically, the driving mechanism of the adjustment baffle 14 is electrically connected to the control box 13 through a wire.

[0036] The adjustment component includes a stepping motor 15 arranged outside the main body 1 and a lead screw 16 and a guide rod 17 arranged in parallel in the installation chamber 6. One end of the lead screw 16 is connected to the output shaft of the stepping motor 15. An adjustment plate 18 is arranged outside the lead screw 16 and the guide rod 17. The adjustment plate 18 is fixedly connected to the insulating sleeve 8.

[0037] The first sleeve 9 is sleeved on the outer side of the end of the movable pipe 7, and a first sealing ring 19 is arranged on the inner wall of the end of the first sleeve 9.

[0038] A temperature sensor 20 and a flow sensor 21 are arranged on the detection box 12. The detection probes of the temperature sensor 20 and the flow sensor 21 are both placed inside the detection box 12, and the temperature sensor 20 and the flow sensor 21 are both electrically connected to the control box 13 through wires.

[0039] One end of the conveying pipe 10 far away from the main body 1 is connected with a coal mill.

[0040] The connecting mechanism includes a first mounting plate 22, a second mounting plate 23, a plurality of conduits 24, and a second sleeve 25. The first mounting plate 22 is arranged on the inner wall of the heat exchange cavity 5, the second mounting plate 23 is arranged at the end of the movable pipe 7, a plurality of the conduits 24 are all arranged on one side surface of the second mounting plate 23, the second sleeve 25 is arranged on the surface of the first mounting plate 22, and the second sleeve 25 corresponds to the conduit 24 one by one.

[0041] A plurality of the second sleeves 25 are communicated with the conveying pipe 10 through a first cavity inside the first mounting plate 22, and a plurality of the conduits 24 are communicated with the movable pipe 7 through a second cavity inside the second mounting plate 23.

[0042] The port of the second sleeve 25 is sleeved on the outer side of one end of the conduit 24, and a second sealing ring 26 is arranged on the inner wall of the port of the second sleeve 25.

[0043] Heat preservation linings are arranged on the inner wall of the heat exchange cavity 5 and on one side surface of the partition plate 4 facing the heat exchange cavity 5.

[0044] Specifically, when using the utility model, cold air and hot air are respectively conveyed through the cold air duct 2 and the hot air duct 3. The cold air sequentially enters the interiors of a plurality of conduits 24 through the first sleeve 9, the movable pipe 7, and the second cavity of the second mounting plate 23, and finally enters the coal mill through the second sleeve 25, the first cavity of the first mounting plate 22, and the conveying pipe 10. The hot air enters the heat exchange cavity 5 of the main body 1 through the hot air duct 3, exchanges heat with the cold air in the conduits 24 in the heat exchange cavity 5, realizes heating and temperature rise of the cold air, and finally discharges from the exhaust pipe 11.

[0045] In the above process, the temperature sensor 20 and the flow sensor 21 in the detection box 12 monitor the temperature and flow of the air in the conveying pipe 10 in real time, and send the monitored data to the control box 13. The control box 13 respectively controls and adjusts the baffle 14 and the stepping motor 15 to work, so as to realize rapid adjustment of the temperature and flow of the air.

[0046] Among them, when the temperature is lower than the set value, the control box 13 controls the stepper motor 15 to work, driving the lead screw 16 to rotate. Then, under the action of the adjusting plate 18, the movable tube 7, the second mounting plate 23, and the conduit 24 are driven to move synchronously toward the side of the installation cavity 6, so that the length of the conduit 24 in the heat exchange cavity 5 is extended, thereby prolonging the time for the air inside the conduit 24 to exchange heat and increasing the temperature of the air. On the contrary, when the air temperature is higher than the set value, the control box 13 controls the stepper motor 15 to rotate in the reverse direction, shortening the length of the conduit 24 in the heat exchange cavity 5.

Claims

1. An energy-saving control device for a primary air system, characterized in that, It includes a main body (1), a cold air duct (2) and a hot air duct (3) connected to the main body (1), where: Inside the main body (1), a heat exchange chamber (5) and an installation chamber (6) are arranged through a partition plate (4). A through hole is opened at the center of the partition plate (4) to install a movable pipe (7). An insulating sleeve (8) is arranged on the outer side of the middle part of the movable pipe (7). The insulating sleeve (8) is slidably connected to the partition plate (4). Inside the heat exchange chamber (5) and the installation chamber (6), a first sleeve (9), a connection mechanism are respectively arranged and connected to both ends of the movable pipe (7). An adjustment component connected to the insulating sleeve (8) is arranged inside the installation chamber (6). A delivery pipe (10) and an exhaust pipe (11) are also arranged outside the main body (1); The cold air duct (2) and the delivery pipe (10) are respectively communicated with the first sleeve (9) and the connection mechanism; The hot air duct (3) and the exhaust pipe (11) are both communicated with the inside of the heat exchange chamber (5); It further includes a detection box (12), and the detection box (12) is arranged at the connection part of the delivery pipe (10) and the connection mechanism; It further includes a control box (13). The control box is installed on one side outside the main body (1). The control box (13) is connected to the detection box (12) and the adjustment component.

2. The energy-saving control device for the primary air system according to claim 1, wherein: An adjustment baffle (14) for adjusting the flow rate is installed at the port of the cold air duct (2). The adjustment baffle (14) is electrically connected to the control box (13) through a wire.

3. The energy-saving control device for the primary air system according to claim 1, wherein: The adjustment component includes a stepping motor (15) arranged outside the main body (1), a lead screw (16) and a guide rod (17) arranged in parallel in the installation chamber (6). One end of the lead screw (16) is connected to the output shaft of the stepping motor (15). An adjustment plate (18) is arranged outside the lead screw (16) and the guide rod (17). The adjustment plate (18) is fixedly connected to the insulating sleeve (8).

4. The energy-saving control device for the primary air system according to claim 1, characterized in that: The first sleeve (9) is sleeved on the outer side of the end of the movable pipe (7), and a first sealing ring (19) is arranged on the inner wall of the end of the first sleeve (9).

5. The energy-saving control device for the primary air system according to claim 1, wherein: A temperature sensor (20) and a flow sensor (21) are arranged on the detection box (12). The detection probes of the temperature sensor (20) and the flow sensor (21) are both placed inside the detection box (12). The temperature sensor (20) and the flow sensor (21) are both electrically connected to the control box (13) through wires.

6. The energy-saving control device for the primary air system according to claim 1, characterized in that: One end of the delivery pipe (10) far from the main body (1) is connected to a coal mill.

7. The energy-saving control device for the primary air system according to claim 1, wherein: The connection mechanism includes a first mounting plate (22), a second mounting plate (23), a plurality of conduits (24) and a second sleeve (25). The first mounting plate (22) is arranged on the inner wall of the heat exchange chamber (5). The second mounting plate (23) is arranged at the end of the movable pipe (7). A plurality of the conduits (24) are all arranged on one side surface of the second mounting plate (23). The second sleeve (25) is arranged on the surface of the first mounting plate (22), and the second sleeve (25) corresponds to the conduit (24) one by one.

8. An energy-saving control device for a primary air system according to claim 7, characterized in that: A plurality of the second sleeves (25) communicate with the conveying pipe (10) through a first cavity inside the first mounting plate (22), and a plurality of the conduits (24) communicate with the movable pipe (7) through a second cavity inside the second mounting plate (23).

9. The energy-saving control device for the primary air system according to claim 7, wherein: The port of the second sleeve (25) is sleeved on the outer side of one end of the conduit (24), and a second sealing ring (26) is arranged on the inner wall at the port of the second sleeve (25).

10. The energy-saving control device for the primary air system according to claim 1, characterized in that: Heat-insulating linings are arranged on the inner wall of the heat exchange cavity (5) and on the surface of the partition plate (4) facing the heat exchange cavity (5).

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