CN212930043U - Dry slag cooling air recovery system of thermal power generating unit and thermal power generating unit - Google Patents
Dry slag cooling air recovery system of thermal power generating unit and thermal power generating unit Download PDFInfo
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- CN212930043U CN212930043U CN202021973698.2U CN202021973698U CN212930043U CN 212930043 U CN212930043 U CN 212930043U CN 202021973698 U CN202021973698 U CN 202021973698U CN 212930043 U CN212930043 U CN 212930043U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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Abstract
The utility model provides a dry slag cooling air recovery system of a thermal power generating unit, which comprises a cold air pipeline, a hot air recovery pipeline and a dust remover; the cooling air pipeline is sleeved on the periphery of the steel belt conveyor, one end of the cooling air pipeline is closed, the top wall close to the closed end is provided with two slag falling ports which are respectively aligned with two slag discharging ports of the boiler, and the other end of the cooling air pipeline is used for discharging ash at the discharge end of the steel belt conveyor and introducing cold air into the cooling air pipeline; the hot air recovery pipeline comprises a trunk pipe and three branch pipes which are separated from the air inlet end of the trunk pipe, and the three branch pipes are respectively communicated with the cold air pipeline at two outer sides of the two slag falling ports and at three positions between the two slag falling ports; the air inlet of the dust remover is connected with the air outlet end of the main pipeline, the air outlet is provided with an exhaust fan, and the output end of the exhaust fan is communicated with a secondary air pipeline of the boiler. The utility model also provides a thermal power unit that has adopted above-mentioned thermal power unit dry slag cooling air recovery system.
Description
Technical Field
The utility model belongs to the technical field of thermal power generating unit, more specifically say, relate to a thermal power generating unit does sediment cooling air recovery system and thermal power generating unit.
Background
The thermal power generating unit comprises three main devices of a boiler, a steam turbine and a generator, and a related matched boiler water treatment system, a fuel supply system, an ash treatment system, a steam turbine heat recovery system and the like. Wherein, when the boiler normally operates, hot ash falls to the steel band conveyer of boiler below by the row's cinder notch (two that set up for the interval usually) of its below, the steel band conveyer carries the lime-ash to broken mechanism and breaks, when hot ash moves on the steel band conveyer, the cladding forms hot-blastly after steel band conveyer outlying air conveying pipeline gets into cold wind and carries out heat exchange to hot ash, because the negative pressure effect in the furnace of boiler, the hot-blastly that reachs row cinder notch position can be inhaled furnace, though warm up after the heat of cold wind absorption hot ash converts into hot-blastly, but still lower for the temperature in the furnace, consequently can be to the combustion efficiency who influences the boiler after getting into furnace, and then influence the working effect of whole thermal power generating unit.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a thermal power unit dry slag cooling air recovery system and thermal power unit aims at solving the problem that thermal power unit dry slag cooling air gets into boiler furnace influences the boiler burning.
In order to achieve the above object, the utility model adopts the following technical scheme: the dry slag cooling air recovery system for the thermal power generating unit comprises a cold air pipeline, a hot air recovery pipeline and a dust remover; the cooling air pipeline is sleeved on the periphery of the steel belt conveyor, one end of the cooling air pipeline is closed, the top wall close to the closed end is provided with two slag falling ports which are respectively aligned with two slag discharging ports of the boiler, and the other end of the cooling air pipeline is used for discharging ash at the discharge end of the steel belt conveyor and introducing cold air into the cooling air pipeline; the hot air recovery pipeline comprises a trunk pipe and three branch pipes which are separated from the air inlet end of the trunk pipe, and the three branch pipes are respectively communicated with the cold air pipeline at three positions of the outer side parts of the two slag falling ports and the part between the two slag falling ports; the air inlet of the dust remover is connected with the air outlet end of the main pipeline, the air outlet is provided with an exhaust fan, and the output end of the exhaust fan is communicated with a secondary air pipeline of the boiler.
As another embodiment of the application, the thermal power generating unit dry slag cooling air recovery system further comprises a controller; the three branch pipes are respectively and sequentially provided with a first air pressure sensor and a first electromagnetic pressure regulating valve along the direction of the air flow inside the three branch pipes, and the three first air pressure sensors and the three first electromagnetic pressure regulating valves are respectively and electrically connected with the controller.
In another embodiment of the present application, a second air pressure sensor and a second electromagnetic pressure regulating valve are sequentially disposed on the trunk pipe along an air flow direction inside the trunk pipe, and the second air pressure sensor, the second electromagnetic pressure regulating valve, and the exhaust fan are electrically connected to the controller, respectively.
As another embodiment of the present application, the output end of the exhaust fan is connected in parallel with a first exhaust pipe and a second exhaust pipe; the first exhaust pipe is used for being communicated with a secondary air pipeline at the front end of the air preheater, and a first stop valve is arranged on the first exhaust pipe; the second exhaust pipe is used for being communicated with the position, located at the rear end of the air preheater, of the secondary air pipeline, and a second stop valve is arranged on the second exhaust pipe.
As another embodiment of this application, first stop valve, second stop valve are the electromagnetism stop valve of being connected with the controller electricity, and the air outlet of dust remover is equipped with first temperature sensor, and first temperature sensor is connected with the controller electricity.
As another embodiment of this application, the air inlet end of cold air duct is equipped with air regulation subassembly, and air regulation subassembly is used for adjusting the air inlet end opening size of cold air duct to the adjustment lets in the cold air amount of wind in the cold air duct.
As another embodiment of the application, the air quantity adjusting component comprises an air door and a motor; the air door is rotatably connected to the air inlet end of the cold air pipeline along the radial direction of the cold air pipeline; the motor is arranged on the cold air pipeline, the output end of the motor is connected with the rotating shaft of the air door, and the motor is electrically connected with the controller.
As another embodiment of this application, the air inlet end of cold-blast pipeline is equipped with second temperature sensor, and second temperature sensor is connected with the controller electricity for detect the lime-ash temperature of steel band conveyer's discharge end.
As another embodiment of the application, the periphery of the slag falling port is provided with a guide cylinder extending into the cold air pipeline, and the guide cylinder is of an inverted cone-shaped structure and is used for guiding hot air near the two slag falling ports to enter the three branch pipes.
The utility model provides a pair of thermal power generating unit dry slag cooling air recovery system's beneficial effect lies in: compared with the prior art, the utility model relates to a thermal power generating unit dry slag cooling air recovery system, the hot lime-ash that falls by two row cinder mouths of boiler falls on the steel band conveyer through the cinder mouth that falls, hot lime-ash arrives the discharge end under the drive of steel band conveyer and then discharges from the cold wind inlet end of cold air duct, in the walking process of hot lime-ash, carry out the heat exchange with the cold wind that reversely lets in the cold air duct and cool, and the cold wind that arrives near two cinder mouths that fall warms up because of the heat exchange turns into hot-blast, partial hot-blast can pass through two cinder mouths that fall, two row cinder mouths get into furnace, the surplus hot-blast can get into three branch road pipe under the twitch effect of air exhauster, then collect and get into the dust remover in the trunk in the lump, get into the secondary air duct of boiler after the dust remover removes, thereby realize hot-blast recycle;
because the junction position of three branch road pipe and cold air duct is in two outsides and two between the cinder notch that fall of two cinder notches respectively, the hot-blast meeting that arrives near two cinder notches can be under the twitch effect of air exhauster, and most hot-blast can get into hot-blast recovery pipeline to can reduce hot-blast amount of wind that gets into furnace through the cinder notch that falls, avoid getting into furnace's hot-blast amount of wind too big and influence boiler combustion temperature and combustion efficiency, and then improve thermal power unit's work efficiency.
The utility model discloses still provide a thermal power unit who has adopted above-mentioned thermal power unit dry slag cooling air recovery system, have the beneficial effect the same with above-mentioned thermal power unit dry slag cooling air recovery system, no longer give unnecessary details here.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural view of a dry slag cooling air recovery system of a thermal power generating unit provided by an embodiment of the present invention;
fig. 2 is a schematic circuit block diagram of a dry slag cooling air recovery system of a thermal power generating unit provided by the embodiment of the utility model.
In the figure: 1. a cold air duct; 10. a slag falling port; 11. a draft tube; 12. an air volume adjusting component; 121. a damper; 122. a motor; 13. a second temperature sensor; 2. a hot air recovery pipeline; 21. a trunk pipe; 211. a second air pressure sensor; 212. a second electromagnetic pressure regulating valve; 22. a branch pipe; 221. a first air pressure sensor; 222. a first electromagnetic pressure regulating valve; 3. a dust remover; 30. a first temperature sensor; 4. an exhaust fan; 41. a first exhaust duct; 411. a first shut-off valve; 42. a second exhaust duct; 421. a second stop valve; 5. a secondary air duct; 50. an air preheater; 6. a boiler; 7. a steel belt conveyor; 8. a flue gas duct.
Detailed Description
In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, a thermal power generating unit dry slag cooling air recovery system provided by the present invention will now be described. The dry slag cooling air recovery system for the thermal power generating unit comprises a cold air pipeline 1, a hot air recovery pipeline 22 and a dust remover 3; the cold air pipeline 1 is sleeved on the periphery of the steel belt conveyor 7, one end of the cold air pipeline is closed, the top wall close to the closed end is provided with two slag falling ports 10 which are respectively aligned with two slag discharging ports of the boiler 6, and the other end of the cold air pipeline is used for discharging ash at the discharging end of the steel belt conveyor 7 and introducing cold air into the cold air pipeline 1; the hot air recovery pipeline 22 comprises a trunk pipe 21 and three branch pipes 22 which are separated from a cold air input end of the trunk pipe 21, and the three branch pipes 22 are respectively communicated with three positions which are positioned on the outer side parts of the two slag falling ports 10 and between the two slag falling ports 10 on the cold air pipeline 1; an air inlet of the dust remover 3 is connected with a cold air output end of the trunk pipe 21, an exhaust fan 4 is arranged on an air outlet, and an output end of the exhaust fan 4 is communicated with a secondary air pipeline 5 of the boiler 6.
It should be noted that the boiler 6 is provided with a secondary air system for inputting oxygen (air) into the boiler 6, so that the fuel in the hearth can be fully combusted, the secondary air system is provided with an air preheater 50, the high-temperature flue gas in the boiler 6 is introduced into the air preheater 50, and the high-temperature flue gas and the secondary air entering the hearth exchange heat, so that the temperature of the secondary air is raised and then enters the hearth, and the combustion temperature in the hearth is prevented from being influenced due to the over-low temperature of the secondary air.
The utility model provides a thermal power generating unit dry slag cooling air recovery system's theory of operation is: when the exhaust fan 4 starts to work, negative pressure can be generated in the dust remover 3 and the hot air recovery pipeline 22, when cold air is converted into hot air through heat exchange with ash residues and reaches the closed end of the cold air pipeline 1, namely the positions near the two slag falling ports 10, the hot air can enter the three branch pipes 22 under the action of the negative pressure, and it is understood that the negative pressure generated by the exhaust fan 4 is higher than the negative pressure in the hearth of the boiler 6, so that most of the hot air can enter the three branch pipes 22, and only a small part of the hot air can enter the hearth through the two slag falling ports 10 to provide combustion oxygen, and the proportion of the two branch pipes can be adjusted by adjusting the working power of the exhaust fan 4, so that the air quantity entering the hearth is matched with the combustion oxygen quantity, and the influence on the combustion temperature and the combustion; after the hot air entering the three branch pipes 22 is dedusted by the deduster 3, clean hot air enters the secondary air pipeline 5 from the output end of the exhaust fan 4, and the temperature of the hot air rises after the heat exchange process with high-temperature ash, so that the hot air can enter the hearth of the boiler 6 through the secondary air pipeline 5, and the recycling of dry slag cooling air is realized.
The utility model provides a thermal power generating unit dry slag cooling air recovery system, compared with the prior art, the hot lime-ash that falls down by two row cinder notch of boiler 6 falls on steel band conveyer 7 through the cinder notch 10 that falls, the hot lime-ash arrives the discharge end under the drive of steel band conveyer 7 after and discharges from the cold wind admission end of cold air duct 1, in the walking process of hot lime-ash sediment, carry out the heat exchange with the cold wind that reversely lets in cold air duct 1 and cool, and the cold wind that arrives near two cinder notches 10 heats up because of the heat exchange turns into hot-blast, part hot-blast can pass through two cinder notches 10, two row cinder notches get into furnace, the surplus hot-blast can get into three branch road pipe 22 under the pumping action of air exhauster 4, then collect and get into dust remover 3 in the trunk pipe 21 in the lump, get into secondary air duct 5 of boiler 6 after dust remover 3 removes dust, thereby realize hot-blast recycle, because the junction position of three branch road pipe 22 and cold air duct 1 is in two outsides and two between the cinder notch 10 that fall of two cinder notches 10 respectively, reach two hot-blasts that fall near cinder notch 10 and can get into hot-blast recovery pipeline 22 under the twitch effect of air exhauster 4, most hot-blasts to can reduce the hot-blast amount of wind that gets into furnace through the cinder notch 10 that falls, avoid getting into furnace's hot-blast amount of wind too big and influence boiler 6 combustion temperature and combustion efficiency, and then improve thermal power unit's work efficiency.
As a specific embodiment of the dry slag cooling air recovery system for the thermal power generating unit provided by the present invention, please refer to fig. 1 and 2, the dry slag cooling air recovery system for the thermal power generating unit further includes a controller; the three branch pipes 22 are respectively provided with a first air pressure sensor 221 and a first electromagnetic pressure regulating valve 222 along the air flow direction inside the three branch pipes, and the three first air pressure sensors 221 and the three first electromagnetic pressure regulating valves 222 are respectively and electrically connected with the controller.
The three first air pressure sensors 221 can respectively detect the air pressures in the three branch pipes 22, the controller judges whether the air pressures in the three branch pipes 22 are balanced according to air pressure detection values, and when the three air pressure detection values are different, the opening size of the corresponding first electromagnetic pressure regulating valve 222 is automatically adjusted by controlling, so that the air pressures in the three branch pipes 22 reach a balanced state, the interference caused by the difference of the air pressures when hot air in each branch pipe 22 enters the branch pipe 21 is avoided (the high-pressure air flow blocks the normal circulation of the low-pressure air flow), the hot air in each branch pipe 22 can be smoothly collected to the branch pipe 21, and the hot air recovery rate is improved.
As an embodiment of the present invention, please refer to fig. 1 and 2, a second air pressure sensor 211 and a second electromagnetic pressure regulating valve 212 are sequentially disposed on the trunk pipe 21 along the inner airflow direction thereof, and the second air pressure sensor 211, the second electromagnetic pressure regulating valve 212 and the exhaust fan 4 are electrically connected to the controller respectively.
The air pressure in the main pipe 21 is detected by the second air pressure sensor 211, and the air pressure in the main pipe 21 is equivalent to the air pressure of the whole system, so that the controller can judge the system pressure according to the detection data of the second air pressure sensor 211, correspondingly adjust the opening of the second electromagnetic pressure regulating valve 212 according to the detection data, and maintain the system pressure in a set range, thereby enabling the cold air in the cold air pipeline 1 to enter the hot air recovery pipeline 22 and the air volume entering the hearth to be kept in a set proportion range, and avoiding the influence on the combustion efficiency of the boiler 6 due to the overlarge air volume entering the hearth.
As a specific implementation manner of the embodiment of the present invention, please refer to fig. 1, the output end of the exhaust fan 4 is connected in parallel with a first exhaust duct 41 and a second exhaust duct 42; the first exhaust pipe 41 is used for communicating with the secondary air pipeline 5 at the front end of the air preheater 50, and a first stop valve 411 is arranged on the first exhaust pipe 41; the second exhaust duct 42 is used for communicating with the secondary air duct 5 at the rear end of the air preheater 50, and a second stop valve 421 is arranged on the second exhaust duct 42.
It should be understood that the air preheater 50 has a secondary air input end, a secondary air output end and a flue gas input end, and the high-temperature flue gas generated in the boiler 6 enters the air preheater 50 through the flue gas pipeline 8, and the secondary air is subjected to heat exchange heating in the air preheater 50. One end of the secondary air entering the air preheater 50 is the rear end of the air preheater 50, and one end of the secondary air discharged from the air preheater 50 after exchanging heat with the high-temperature flue gas in the air preheater 50 is the front end of the air preheater 50. Because the temperature of the secondary air entering the boiler 6 is insufficient to influence the combustion temperature of the boiler 6, the secondary air is required to be ensured to be hot air (cold air after heat exchange and temperature rise), the temperature of the hot air discharged by the exhaust fan 4 depends on the slag discharge amount of the boiler 6, when the boiler 6 runs at full load, the slag discharge amount is large, so that the temperature of the hot air formed after heat exchange with ash and slag on the steel strip conveyor 7 is high, at this time, the hot air discharged by the exhaust fan 4 enters the secondary air pipeline 5 through the first exhaust pipe 41 at the front end of the air preheater 50 by opening the first stop valve 411 and closing the second stop valve 421, and then directly enters the boiler 6 without being heated through the air preheater 50 again, when the boiler 6 runs at low load, the slag discharge amount is small, so that the temperature of the hot air formed after heat exchange with the ash and slag on the steel strip conveyor is low, at this time, the, The first stop valve 411 is closed, so that the hot air exhausted by the exhaust fan 4 enters the secondary air pipeline 5 through the second exhaust pipe 42 at the rear end of the air preheater 50, then enters the air preheater 50 to exchange heat with high-temperature flue gas to heat up and then enters the boiler 6, thereby avoiding the influence on the combustion temperature and the combustion efficiency of the boiler 6 due to insufficient temperature of the secondary air entering the boiler 6.
As a specific implementation manner of the embodiment of the present invention, please refer to fig. 1 and fig. 2, the first stop valve 411 and the second stop valve 421 are electromagnetic stop valves electrically connected to the controller, the air outlet of the dust collector 3 is provided with a first temperature sensor 30, and the first temperature sensor 30 is electrically connected to the controller.
The temperature of the hot air passing through the exhaust fan 4 is detected by the first temperature sensor 30, the controller judges whether the hot air enters the secondary air pipeline 5 from the first exhaust pipe 41 or enters the secondary air pipeline 5 from the second exhaust pipe 42 according to the detected temperature value, normally, when the detected temperature value is 20 ℃ lower than the temperature of the secondary air heated by the air preheater 50, the controller controls the first stop valve 411 to be opened and the second stop valve 421 to be closed, the hot air directly enters the boiler 6 from the first exhaust pipe 41 without passing through the air preheater 50, thereby avoiding the temperature reduction caused by the heat exchange with the secondary air with lower temperature in the air preheater 50, when the detected temperature value is lower than the temperature of the secondary air heated by the air preheater 50 and exceeds 20 ℃, the controller controls the second stop valve 421 to be opened and the first stop valve 411 to be closed, the hot air enters the secondary air pipeline 5 from the second exhaust pipe 42 at the rear end of the air preheater 50, then enters the air preheater 50 to exchange heat with the high-temperature flue gas, and then enters the boiler 6 after the temperature is raised again. The opening and closing of the first stop valve 411 and the second stop valve 421 are automatically controlled by the controller according to the detection value of the first temperature sensor 30, so that the temperature of secondary air entering the boiler 6 meets the requirement, and the influence on the combustion temperature and the combustion efficiency of the boiler 6 due to insufficient temperature of hot air entering the boiler 6 is avoided.
As a specific implementation manner of the embodiment of the present invention, please refer to fig. 1, the air inlet end of the cold air duct 1 is equipped with the air volume adjusting assembly 12, and the air volume adjusting assembly 12 is used for adjusting the air inlet end opening size of the cold air duct 1, so as to adjust the amount of cold air introduced into the cold air duct 1. Can carry out the adaptability adjustment to the cold wind amount of wind that lets in cold air duct 1 according to boiler 6's row of sediment volume, avoid the too big and 6 inside influence boiler 6 combustion efficiency of boiler that get into of cold wind amount of wind on the one hand, on the other hand can let in the volume through increasing cold wind fast when 6 full load operation of boiler to ensure the cooling efficiency to the lime-ash, avoid because of the lime-ash volume is big, cold wind is not enough to cause the exhaust ash temperature on the guipure conveyer too high.
As a specific implementation manner of the embodiment of the present invention, please refer to fig. 1 and fig. 2, the air volume adjusting assembly 12 includes an air door 121 and a motor 122; wherein, the air door 121 is rotatably connected to the air inlet end of the cold air duct 1 along the radial direction of the cold air duct 1; the motor 122 is arranged on the cold air duct 1, the output end of the motor is connected with the rotating shaft of the air door 121, and the motor 122 is electrically connected with the controller. The relative angle of air door 121 and cold air duct 1 is different, then the opening size that can pass cold wind is different, rotates through controller control motor 122 to drive air door 121 and rotate, thereby realize cold wind air regulation, easy operation is convenient.
As a specific implementation manner of the embodiment of the present invention, please refer to fig. 1 and fig. 2, the air inlet end of the cold air duct 1 is provided with the second temperature sensor 13, and the second temperature sensor 13 is electrically connected to the controller for detecting the ash temperature at the discharge end of the steel belt conveyor 7. The controller controls the motor 122 to rotate according to the ash temperature value detected by the second temperature sensor 13, so that the angle of the air door 121 is correspondingly adjusted, the cold air inlet amount is matched with the ash temperature, the ventilation amount is increased when the ash temperature is high, otherwise, the ventilation amount is reduced, and the high-temperature ash is prevented from being discharged.
As a specific implementation manner of the embodiment of the present invention, please refer to fig. 1, the periphery of the slag falling opening 10 is provided with a guide cylinder 11 extending into the cold air duct 1, the guide cylinder 11 is of an inverted cone-shaped structure for guiding two hot air near the slag falling opening 10 to enter into the three branch pipes 22. By utilizing the guiding function of the guide cylinder 11, hot air circulates to the three branch pipes 22, so that the hot air recovery rate can be improved, and the amount of hot air entering the hearth through the slag falling port 10 is reduced.
The utility model also provides a thermal power generating unit. Referring to fig. 1 and 2, the thermal power generating unit includes the thermal power generating unit of the dry slag cooling air recovery system of the thermal power generating unit.
The utility model provides a thermal power generating unit, thermal power generating unit who has adopted above-mentioned thermal power generating unit dry slag cooling air recovery system, the hot lime-ash that falls down by two row cinder notch of boiler 6 falls on steel band conveyer 7 through the cinder notch 10 that falls, the hot lime-ash arrives the discharge end under the drive of steel band conveyer 7 and then discharges from the cold wind admission end of cold air duct 1, in the walking process of hot lime-ash, carry out the heat exchange with the cold wind that reversely lets in cold air duct 1 and cool, when cold wind reachs the blind end of cold air duct 1, part cold wind can be through two cinder notches 10 that fall, two row cinder notches get into furnace, surplus cold wind can get into three branch road pipe 22 under the pumping action of air exhauster 4, then collect and get into dust remover 3 in the trunk road pipe 21 after, get into secondary air duct 5 of boiler 6 after dust remover 3 removes dust, thereby realize the recycle of cold wind, because the junction position of three branch road pipe 22 and cold air duct 1 is in two outsides and two between the slag hole 10 that fall of two slag holes 10 respectively, the cold wind that arrives near two slag holes 10 that fall can be under the twitch effect of air exhauster 4, and most cold wind can get into hot-blast recovery pipeline 22 to can reduce the amount of wind that cold wind got into furnace through the slag hole 10 that falls, avoid getting into furnace's cold wind amount of wind too big and influence boiler 6 combustion efficiency, and then improve thermal power unit's work efficiency.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. Thermal power generating unit dry slag cooling air recovery system, its characterized in that includes:
the cold air pipeline is sleeved on the periphery of the steel belt conveyor, one end of the cold air pipeline is closed, the top wall close to the closed end is provided with two slag falling ports which are respectively aligned with two slag discharging ports of the boiler, and the other end of the cold air pipeline is used for discharging ash at the discharge end of the steel belt conveyor and reversely introducing cold air into the cold air pipeline along the traveling direction of the ash;
the hot air recovery pipeline comprises a trunk pipe and three branch pipes which are separated from the air inlet end of the trunk pipe, and the three branch pipes are respectively communicated with the cold air pipeline at the outer side parts of the two slag falling ports and the three positions between the two slag falling ports;
and the air inlet of the dust remover is connected with the air outlet end of the trunk pipe, the air outlet is provided with an exhaust fan, and the output end of the exhaust fan is communicated with a secondary air pipeline of the boiler.
2. The thermal power unit dry slag cooling air recovery system as claimed in claim 1, further comprising a controller; the three branch pipes are respectively and sequentially provided with a first air pressure sensor and a first electromagnetic pressure regulating valve along the direction of the air flow inside the branch pipes, and the three first air pressure sensors and the three first electromagnetic pressure regulating valves are respectively and electrically connected with the controller.
3. The dry slag cooling air recovery system of the thermal power generating unit as claimed in claim 2, wherein a second air pressure sensor and a second electromagnetic pressure regulating valve are sequentially arranged on the main line pipe along an air flow direction inside the main line pipe, and the second air pressure sensor, the second electromagnetic pressure regulating valve and the exhaust fan are respectively and electrically connected to the controller.
4. The dry slag cooling air recovery system of the thermal power generating unit as claimed in claim 2, wherein the output end of the exhaust fan is connected in parallel with a first exhaust duct and a second exhaust duct; the first exhaust pipe is used for being communicated with the position, located at the front end of the air preheater, of the secondary air pipeline, and a first stop valve is arranged on the first exhaust pipe; the second exhaust pipe is used for communicating with the secondary air pipeline at the rear end of the air preheater, and a second stop valve is arranged on the second exhaust pipe.
5. The thermal power generating unit dry slag cooling air recovery system as set forth in claim 4, wherein the first stop valve and the second stop valve are electromagnetic stop valves electrically connected with the controller, and an air outlet of the dust remover is provided with a first temperature sensor electrically connected with the controller.
6. The thermal power generating unit dry slag cooling air recovery system as claimed in claim 2, wherein an air volume adjusting assembly is arranged at an air inlet end of the cold air duct, and the air volume adjusting assembly is used for adjusting the size of an opening of the air inlet end of the cold air duct, so as to adjust the volume of the cold air introduced into the cold air duct.
7. The thermal power generating unit dry slag cooling air recovery system as recited in claim 6, wherein the air volume adjusting assembly comprises:
the air door is rotatably connected to the air inlet end of the cold air pipeline along the radial direction of the cold air pipeline;
the motor is arranged on the cold air pipeline, the output end of the motor is connected with the rotating shaft of the air door, and the motor is electrically connected with the controller.
8. The thermal power generating unit dry slag cooling air recovery system as claimed in claim 7, wherein a second temperature sensor is disposed at the air inlet end of the cold air duct, and the second temperature sensor is electrically connected to the controller and is used for detecting the ash temperature at the discharge end of the steel belt conveyor.
9. The thermal power generating unit dry slag cooling air recovery system as claimed in any one of claims 1 to 8, wherein a guide cylinder extending into the cold air duct is arranged on the periphery of the slag falling port, and the guide cylinder is of an inverted cone-shaped truncated cone structure and is used for guiding hot air near the two slag falling ports to enter the three branch pipes.
10. A thermal power generating unit characterized by comprising the thermal power generating unit dry slag cooling air recovery system according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021973698.2U CN212930043U (en) | 2020-09-10 | 2020-09-10 | Dry slag cooling air recovery system of thermal power generating unit and thermal power generating unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021973698.2U CN212930043U (en) | 2020-09-10 | 2020-09-10 | Dry slag cooling air recovery system of thermal power generating unit and thermal power generating unit |
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| CN212930043U true CN212930043U (en) | 2021-04-09 |
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| CN202021973698.2U Active CN212930043U (en) | 2020-09-10 | 2020-09-10 | Dry slag cooling air recovery system of thermal power generating unit and thermal power generating unit |
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2020
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