CN111442658A - Air cooling island tube bundle frost crack prevention device - Google Patents
Air cooling island tube bundle frost crack prevention device Download PDFInfo
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- CN111442658A CN111442658A CN202010347378.4A CN202010347378A CN111442658A CN 111442658 A CN111442658 A CN 111442658A CN 202010347378 A CN202010347378 A CN 202010347378A CN 111442658 A CN111442658 A CN 111442658A
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- fan
- crack prevention
- frost crack
- cooling
- air cooling
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B9/00—Auxiliary systems, arrangements, or devices
- F28B9/005—Auxiliary systems, arrangements, or devices for protection against freezing
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- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses an air cooling island tube bundle anti-freezing cracking device which comprises a cooling fan device and a tube bundle arranged above the cooling fan device, wherein the tube bundle is connected with a steam distribution pipe, the steam distribution pipe is connected with a steam exhaust pipeline, the steam exhaust pipeline is connected with a terminal steam exhaust device, an anti-freezing adjusting plate is arranged above the cooling fan device, the anti-freezing adjusting plate is connected with an electric actuating mechanism, and the electric actuating mechanism is arranged on the cooling fan device. According to the invention, the anti-freezing adjusting plate is arranged above the cooling fan device, and the opening of the anti-freezing adjusting plate is adjusted by the electric actuating mechanism to control the air inlet quantity, so that the rotating speed of the fan of the cooling fan device is influenced by the air inlet quantity. The invention has simple operation, and is economical and practical.
Description
Technical Field
The invention relates to an anti-freezing device for a tube bundle of an air cooling island, and belongs to the field of air cooling island equipment.
Background
The air cooling island mainly exchanges heat between air and exhaust gas to cool the exhaust steam exhausted by the steam turbine to form condensed water, thus forming a complete thermodynamic cycle. The condenser with direct air cooling is called as air cooling condenser and is composed of a tube bundle of elliptic flat base tubes brazed with aluminum fins. The cooling air required by the direct air cooling system is usually supplied directly by mechanical ventilation. The exhaust steam of the steam turbine is sent to an outdoor air-cooled condenser through an exhaust pipe, and the axial flow cooling fan enables air to flow through the outer surface of the radiator, so that the exhaust steam is condensed into water to enter a lower header and then is sent to a heat regenerative system of the steam turbine through a condensate pump.
At present, freezing prevention in winter is an important problem in the operation of the air cooling island. The phenomenon of frost crack easily appears in the air cooling island tube bank in operation and start-stop process to strong wind, cooling, in addition radiator heat distribution inequality, threatens the safe operation of air cooling island unit. Meanwhile, in order to ensure the safe operation of the unit and avoid the occurrence of frost cracking, the steam discharge quantity of the unit must be increased to improve the temperature of the surface of the radiator and the temperature of condensed water during the operation of the unit in winter, but the energy consumption of the unit can be greatly increased under the condition.
Disclosure of Invention
The invention aims to provide an air cooling island tube bundle frost crack prevention device which can effectively prevent the tube bundle from frost crack in a low-temperature environment and ensure the safe operation of an air cooling island unit; meanwhile, when the steam turbine runs in winter, the steam discharge amount of the unit running in winter can not be increased or reduced through the set of device, and the purpose of reducing energy consumption is achieved.
In order to solve the technical problems, the invention adopts the following technical scheme: the utility model provides an air cooling island tube bank frost crack prevention device, includes the cooling blower device, sets up in the tube bank of cooling blower device top, and the tube bank is connected with the steam distribution pipe, and the steam distribution pipe is connected with the exhaust steam pipe, and the exhaust steam pipe is connected with terminal exhaust steam device, and the top of cooling blower device is provided with the regulating plate that prevents frostbite, prevents frostbite the regulating plate and is connected with electric actuator, electric actuator set up in on the cooling blower device.
In the air cooling island tube bundle frost crack prevention device, the cooling fan device comprises an air duct, a fan motor, a fan bridge and a fan blade, the fan bridge is fixed at the top of the air duct, the fan motor is arranged at the top of the air duct and fixed on the fan bridge, and the fan blade is connected with the fan motor.
In the air cooling island tube bundle frost cracking prevention device, the electric actuator is mounted on a side frame rod of the fan bridge.
The anti-freezing and anti-cracking device for the air cooling island tube bundle further comprises a motor-driven connecting rod, and the electric actuating mechanism is connected with the anti-freezing adjusting plate through the motor-driven connecting rod.
In the air cooling island tube bundle anti-freezing cracking device, the adjusting angle of the anti-freezing adjusting plate is 0-180 degrees.
In the air cooling island tube bundle anti-freezing device, the anti-freezing device further comprises a supporting beam, the supporting beam is arranged above the cooling fan device, and the anti-freezing adjusting plate is arranged on the supporting beam.
Several groups of backpressure set values are preset in an air cooling control system of the air cooling island, the backpressure actually measured after processing is compared with the set values, and therefore an instruction is sent out, the rotating speed of a fan motor is changed, the flow rate of cooling air is coordinated with operation conditions (steam load and atmospheric temperature), and the exhaust pressure (set value) of the steam turbine is kept constant. When the actual measurement back pressure is higher than a set value, the rotating speed of the fan motor in operation is increased or more fan motors are started; and when the measured back pressure is lower than the set value, reducing the rotating speed of the running fan motor or stopping the running part of the fan motor. The frequency converter of the air cooling control system controls the fan motor to drive the fan blade to rotate, and the frequency converter is unstable and is easy to jump, so that the minimum speed of the frequency converter controlling the fan motor is 10 Hz. When the ambient temperature is <20 degrees, the rotation speed is limited to below 50 Hz. When the temperature values of the three measuring points of the environmental temperature of the air cooling island are all kept at more than 4 ℃ for 5 minutes, the operation of the air cooling island is in a summer mode. When the temperature values of the three measuring points of the ambient temperature are all less than 2 ℃, the air cooling island is operated in a winter mode, and at the moment, the isolation valve and the vacuum pumping valve on the steam distribution pipe need to be closed.
Temperature detectors are uniformly distributed on a condensed water pipeline and the surface of the bottom of the radiator, and through the temperature detectors, the air cooling control system can obtain the condensed water temperature of each position of the radiator at any time and timely ensure the operation safety of the tube bundle by adjusting the operation state of the fan electrode. However, the minimum speed of the fan motor controlled by the frequency converter is 10Hz, so that after the rotating speed of the fan unit is reduced to 10Hz, if the water temperature continues to drop, all the fan motors can only be stopped, but the back pressure of the steam turbine can also be increased, and only all the fan motors can be started to cause anti-freezing pressure. Meanwhile, all fan motors can stop running sometimes in winter, but in the case of the above situation, strong wind can be poured into the radiator through the wind barrel to cause anti-freezing pressure, and at the moment, the safety of the radiator can be ensured only by increasing the steam discharge of the unit.
In the air cooling island tube bundle frost crack prevention device, the air cooling island tube bundle frost crack prevention device further comprises a radiator, wherein the radiator is arranged above the cooling fan device, and temperature detectors are uniformly distributed on the surface of the radiator and a condensed water pipeline at the bottom of the radiator. The temperature of condensed water at the bottom of the radiator or the surface of the radiator is obtained through a temperature detector, and if the condensed water is lower than the set process temperature or the local temperature of the surface of the radiator is uneven, the temperature of the condensed water of the radiator cannot be increased to be higher than the set temperature or the local temperature of the surface of the radiator is uneven after starting and stopping the fan or adjusting the rotating speed of the fan, and the angle of the anti-freezing adjusting plate can be adjusted until the angle is 0.
In the air cooling island tube bundle frost crack prevention device, the inverted-V-shaped shed cover body is arranged above the cooling fan device, and the anti-freezing adjusting plate arranged above the cooling fan device is fixedly arranged on the inverted-V-shaped shed cover body through the supporting beam.
Compared with the prior art, the anti-freezing adjusting plate is arranged above the cooling fan device, the amount of cold air entering the area above the anti-freezing adjusting plate from the air duct is adjusted by the anti-freezing adjusting plate, the cold air can be prevented from entering the radiator above the anti-freezing adjusting plate by the anti-freezing adjusting plate, the contact area of the cold air and the radiator is reduced, the surface temperature of the radiator can be further improved, and frost cracking of a tube bundle is avoided.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the arrangement structure of the antifreeze adjusting plate of the invention;
FIG. 3 is a schematic plan view of an antifreeze adjustment plate of the present invention;
fig. 4 is an enlarged view of a in fig. 3 of the present invention.
Reference numerals: 1-cooling fan device, 101-wind barrel, 102-fan motor, 103-fan bridge, 104-fan blade, 2-pipe bundle, 3-steam distribution pipe, 4-steam exhaust pipeline, 5-terminal steam exhaust device, 6-anti-freezing adjusting plate, 7-electric actuator, 8-motor connecting rod, 9-supporting beam, 10-radiator and 11-shed cover body.
The invention is further described with reference to the following figures and detailed description.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention.
Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example 1 of the invention: the utility model provides an air cooling island tube bank frost crack prevention device, includes cooling blower device 1, sets up in tube bank 2 of cooling blower device 1 top, and tube bank 2 is connected with steam distribution pipe 3, and steam distribution pipe 3 is connected with exhaust pipe 4, and exhaust pipe 4 is connected with terminal exhaust apparatus 5, and cooling blower device 1's top is provided with frostproofing regulating plate 6, and frostproofing regulating plate 6 is connected with electric actuator 7, and electric actuator 7 sets up on cooling blower device 1.
Example 2 of the invention: the utility model provides an air cooling island tube bank frost crack prevention device, includes cooling blower device 1, sets up in tube bank 2 of cooling blower device 1 top, and tube bank 2 is connected with steam distribution pipe 3, and steam distribution pipe 3 is connected with exhaust pipe 4, and exhaust pipe 4 is connected with terminal exhaust apparatus 5, and cooling blower device 1's top is provided with frostproofing regulating plate 6, and frostproofing regulating plate 6 is connected with electric actuator 7, and electric actuator 7 sets up on cooling blower device 1. Specifically, the cooling fan device 1 includes an air duct 101, a fan motor 102, a fan bridge 103 and a fan blade 104, the fan blade 104 is disposed at a duct opening of the air duct 101 and connected to the fan motor 102, the fan bridge 103 is fixed to the top of the air duct 101, and the fan motor 102 is mounted at the top of the air duct 101 and fixed to the fan bridge 103. Further, the electric actuator 7 is mounted on a side frame rod of the fan bridge 103.
Example 3 of the invention: the utility model provides an air cooling island tube bank frost crack prevention device, includes cooling blower device 1, sets up in tube bank 2 of cooling blower device 1 top, and tube bank 2 is connected with steam distribution pipe 3, and steam distribution pipe 3 is connected with exhaust pipe 4, and exhaust pipe 4 is connected with terminal exhaust apparatus 5, and cooling blower device 1's top is provided with frostproofing regulating plate 6, and frostproofing regulating plate 6 is connected with electric actuator 7, and electric actuator 7 sets up on cooling blower device 1. The electric actuator 7 is electrically connected with a DCS (distributed Control System) Control system, the electric actuator 7 is controlled in real time through the DCS Control system according to parameters such as unit exhaust steam pressure, environment temperature, condensation water temperature and unit load, and the purpose of adjusting the angle of the anti-freezing adjusting plate 6 is achieved through the electric actuator 7. The cooling fan device 1 comprises an air duct 101, a fan motor 102 and a fan bridge 103, wherein the fan bridge 103 is fixed on the top of the air duct 101, and the fan motor 102 is installed on the top of the air duct 101 and fixed on the fan bridge 103. The device also comprises a motor-driven connecting rod 8, and the electric actuating mechanism 7 is connected with the anti-freezing adjusting plate 6 through the motor-driven connecting rod 8. In this embodiment, the anti-freezing adjusting plate 6 is of a louver structure, and the electric actuator 7 drives the motor-driven link 8 to move, so as to drive the anti-freezing adjusting plate 6 connected with the motor-driven link 8, so that the anti-freezing adjusting plate 6 can adjust the angle within the range of 0-180 degrees.
Furthermore, the adjusting angle of the anti-freezing adjusting plate 6 is 0-180 degrees. The device also comprises a supporting beam 9, the supporting beam 9 is arranged above the cooling fan device 1, and the anti-freezing adjusting plate 6 is arranged on the supporting beam 9. The device also comprises a radiator 10, wherein the radiator 10 is arranged above the cooling fan device 1, and temperature detectors are uniformly distributed on a condensed water pipeline and the surface of the bottom of the radiator 10. The top of cooling blower device 1 still is provided with the canopy lid 11 that is the type of falling V form, the frostproofing regulating plate 6 that sets up in cooling blower device 1 top is through a supporting beam 9 fixed mounting on the canopy lid 11 that is the type of falling V form, and a supporting beam 9 is fixed on canopy lid 11, and frostproofing regulating plate 6 is installed on a supporting beam 9.
According to the invention, the anti-freezing adjusting plate 6 is arranged above the cooling fan device 1, and the amount of cold air entering the area above the anti-freezing adjusting plate 6 from the air duct 101 is adjusted by the anti-freezing adjusting plate 6. In winter, in order to improve the anti-freezing pressure of the radiator 10, when the temperature of the radiator 10 needs to be improved, the adjusting angle of the anti-freezing adjusting plate 6 is adjusted to 0 degree, cold air blown from the air duct 101 is prevented from entering the radiator 10 above the anti-freezing adjusting plate 6, the contact area between the cold air entering from the air duct 101 and the radiator 10 is reduced, the surface temperature of the radiator 10 is further improved, the pipe bundle 2 is prevented from being frozen and cracked, the surface temperature of the radiator 10 does not need to be improved by increasing the steam discharge amount of a unit, and the overall operation energy consumption of the air cooling island is reduced; when the radiator 10 has the anti-freezing pressure, the adjusting angle of the anti-freezing adjusting plate 6 is increased, so that cold air entering from the air duct 101 can blow to the radiator 10 above the anti-freezing adjusting plate 6 through the anti-freezing adjusting plate 6, and the purpose of heat dissipation is achieved.
Claims (8)
1. The utility model provides an air cooling island tube bank frost crack prevention device, its characterized in that, includes cooling blower device (1), sets up in tube bank (2) of cooling blower device (1) top, tube bank (2) are connected with steam distribution pipe (3), steam distribution pipe (3) are connected with exhaust pipe (4), exhaust pipe (4) are connected with terminal exhaust apparatus (5), the top of cooling blower device (1) is provided with frostproofing regulating plate (6), frostproofing regulating plate (6) are connected with electric actuator (7), electric actuator (7) set up in on cooling blower device (1).
2. The air cooling island tube bundle frost crack prevention device of claim 1, wherein the cooling fan device (1) comprises an air duct (101), a fan motor (102), a fan bridge (103) and a fan blade (104), the fan bridge (103) is fixed on the top of the air duct (101), the fan motor (102) is installed on the top of the air duct (101) and fixed on the fan bridge (103), and the fan blade (104) is connected with the fan motor (102).
3. The air cooling island pipe bundle frost crack prevention device as claimed in claim 2, wherein the electric actuator (7) is mounted on a side frame rod of the fan bridge (103).
4. The air cooling island tube bundle frost crack prevention device according to claim 3, characterized by further comprising a motor-driven connecting rod (8), wherein the electric actuator (7) is connected with the frost crack prevention adjusting plate (6) through the motor-driven connecting rod (8).
5. The air cooling island pipe bundle frost crack prevention device according to claim 4, wherein the adjusting angle of the frost crack prevention adjusting plate (6) is 0-180 degrees.
6. The air cooling island tube bundle frost crack prevention device according to claim 5, further comprising a support beam (9), wherein the support beam (9) is arranged above the cooling fan device (1), and the frost adjusting plate (6) is arranged on the support beam (9).
7. The air cooling island tube bundle frost crack prevention device according to claim 6, further comprising a radiator (10), wherein the radiator (10) is disposed above the cooling fan device (1), and temperature detectors are uniformly distributed on the surface of the radiator (10) and a condensed water pipeline at the bottom of the radiator (10).
8. The air cooling island pipe bundle frost crack prevention device according to claim 1 or 7, wherein a shed cover body (11) in an inverted V shape is arranged above the cooling fan device (1), and the frost crack prevention adjusting plate (6) arranged above the cooling fan device (1) is fixedly mounted on the shed cover body (11) in the inverted V shape through a supporting beam (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010347378.4A CN111442658A (en) | 2020-04-28 | 2020-04-28 | Air cooling island tube bundle frost crack prevention device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010347378.4A CN111442658A (en) | 2020-04-28 | 2020-04-28 | Air cooling island tube bundle frost crack prevention device |
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| Publication Number | Publication Date |
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| CN111442658A true CN111442658A (en) | 2020-07-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010347378.4A Pending CN111442658A (en) | 2020-04-28 | 2020-04-28 | Air cooling island tube bundle frost crack prevention device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113883915A (en) * | 2021-08-24 | 2022-01-04 | 中国大唐集团科学技术研究总院有限公司华北电力试验研究院 | Air cooling island cooling device of direct air cooling unit |
-
2020
- 2020-04-28 CN CN202010347378.4A patent/CN111442658A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113883915A (en) * | 2021-08-24 | 2022-01-04 | 中国大唐集团科学技术研究总院有限公司华北电力试验研究院 | Air cooling island cooling device of direct air cooling unit |
| CN113883915B (en) * | 2021-08-24 | 2023-11-03 | 中国大唐集团科学技术研究总院有限公司华北电力试验研究院 | Air cooling island cooling device of direct air cooling unit |
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