CN210543450U - Air suction type direct steam cooling system - Google Patents

Air suction type direct steam cooling system Download PDF

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CN210543450U
CN210543450U CN201921117365.7U CN201921117365U CN210543450U CN 210543450 U CN210543450 U CN 210543450U CN 201921117365 U CN201921117365 U CN 201921117365U CN 210543450 U CN210543450 U CN 210543450U
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heat exchange
exchange tube
cooling system
support
steam cooling
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刘学
李国栋
张建伟
林伟宁
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Huadian Heavy Industries Co Ltd
China Huadian Engineering Group Co Ltd
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Huadian Heavy Industries Co Ltd
China Huadian Engineering Group Co Ltd
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    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
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Abstract

The utility model discloses a formula of induced drafting direct steam cooling system, including formula of induced drafting axial fan, heat exchanger tube bank, steam distribution pipeline, comdenstion water collection pipeline, supporting platform and support column, on support platform was located to heat exchanger tube bank, constitute by a plurality of heat exchange tubes, the one end of heat exchange tube was connected on steam distribution pipeline, and the other end of heat exchange tube is connected on comdenstion water collection pipeline. The air suction type axial flow fan is arranged above the heat exchange tube bundle, and the support columns are arranged below the supporting platform. The utility model discloses a high-order method that sets up formula axial fan that induced drafts improves the distribution of cold air, improves heat exchange efficiency, sets up kinetic energy recovery formula guide duct, reduces the running cost, reduces the area of building steam cooling system, and simultaneously, recently smooth, reduces the height of support column, saves the cost of steam cooling system initial stage construction by a wide margin to lower support column can also reduce the interference influence of crosscut wind to steam cooling system, improves steam cooling system's stability.

Description

Air suction type direct steam cooling system
Technical Field
The utility model relates to a power plant's steam cooling technical field that condenses, especially a formula of induced drafting direct steam cooling system.
Background
The steam condensation process is a part of the basic cycle of the power plant, the steam generated after the boiler is combusted is recovered in the form of condensed water, then the pressure is applied through a pressure water pump, and the condensed water enters the boiler again to complete the cycle process. At present, the method for realizing steam condensation mainly comprises two types of water cooling and air cooling, and the air cooling is divided into direct air cooling and indirect air cooling, wherein the direct air cooling depends on cold air provided by a fan to complete heat exchange, so that the steam is cooled and condensed, and the recovery circulation of condensed water is realized. The direct air cooling system is widely applied to steam condensation and recovery of the thermal power plant due to the advantages of simple equipment, low operation cost, water resource saving and the like.
The traditional direct air-cooling steam condensing system adopts a blast axial flow fan to provide cold air, the blast axial flow fan is arranged below a heat exchange tube, and the cold air passes through the heat exchange tube from bottom to top under the drive of the blast axial flow fan to complete heat exchange. This arrangement has the following drawbacks: firstly, the blast axial flow fan is arranged below the heat exchange pipe, the wind resistance of the fan is large, the power of the fan needs to be improved, and the operation cost of the system is increased; secondly, the heat exchange efficiency is low, the number of heat exchange pipes needs to be increased to maintain the normal operation of the power plant, and the occupied area of equipment is large; third, because fan-type axial fan sets up in the heat exchange tube below, in order to guarantee that the cold air inlet is smooth, need set up supporting platform at the high level, initial stage construction is with high costs, need a large amount of steel, and is further, the supporting platform high-order is arranged, the crosscut wind that receives is great, the crosscut wind can disturb the cold air flow, influence the heat transfer effect, and be unfavorable for preventing frostbite in winter, consequently, need to improve direct air cooling steam condensing system's structure urgently.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a direct steam cooling system of formula of induced drafting can improve steam cooling system's heat exchange efficiency, reduces running cost and initial construction expense, reduces equipment area to can reduce the influence of crosscut wind to steam cooling system to a certain extent, improve system's stability.
In order to solve the technical problem, the utility model discloses a following technical scheme: an air suction type direct steam cooling system comprises an air suction type axial flow fan, a plurality of groups of heat exchange tube bundles, a steam distribution pipeline, a condensate water collection pipeline, a supporting platform and supporting columns. On supporting platform was located to the heat exchanger tube bank, the heat exchanger tube bank comprises a plurality of heat exchange tubes, and the one end of heat exchange tube is connected on steam distribution pipeline, and boiler steam gets into the heat exchange tube via steam distribution pipeline and condenses, and the other end of heat exchange tube is connected on the comdenstion water collecting pipe, meets the steam inflow comdenstion water collecting pipe that the cold condenses, collects in unison. The air suction type axial flow fan is arranged above the heat exchange tube bundle, and is used for guiding cold air to pass through the heat exchange tube bundle from bottom to top, the cold air exchanges heat with steam in the heat exchange tube, condensation of the steam is achieved, the cold air is then discharged from the top, and the support column is arranged below the support platform and plays a supporting role.
In the aforementioned suction direct steam cooling system, the number of heat exchange tube bundles is an important component, and is selected according to the scale of the power plant and the boiler unit. The heat exchange tubes in each group of heat exchange tube bundles are arranged in parallel, a gap is reserved between the heat exchange tubes in each group of heat exchange tube bundles, ventilation is facilitated, and the distance between the heat exchange tubes in the same heat exchange tube bundle is 0.2mm-1 mm. The heat exchange tube slope sets up on supporting platform, and both ends one is high one low, and the higher one end of heat exchange tube is connected with steam distribution pipe, and the lower one end of heat exchange tube is collected the pipe connection with the comdenstion water, and the comdenstion water of being convenient for flows out, avoids the comdenstion water to be detained in the heat exchange tube and freezes jam etc., influences the normal heat transfer of steam. The heat exchange tubes in two adjacent groups of heat exchange tube bundles are respectively inclined towards two sides and arranged in a V shape, namely, the higher ends of the heat exchange tubes in the two adjacent groups of heat exchange tube bundles are inclined towards the outer side, the acute angle range formed by the heat exchange tubes and the horizontal direction is 54-72 degrees, the air suction type axial flow fan is arranged above the V shape, namely, the upper portion between the two adjacent groups of heat exchange tube bundles, the heat exchange tubes in the two adjacent groups of heat exchange tube bundles are inclined outwards at the top ends, and the air suction type axial flow fan simultaneously provides cold air for the two groups of heat exchange. The high-position arranged air suction type axial flow fan improves the distribution of cold air, can enable the cold air to more uniformly penetrate through the heat exchange tube bundle, improves the heat exchange efficiency, reduces the heat dissipation area of the heat exchange tube bundle, can reduce the equipment construction investment, and can also reduce the floor area of a steam cooling system.
The utility model discloses a further reduce the energy consumption, still set up kinetic energy recovery formula guide duct, kinetic energy recovery formula guide duct is connected with the top of formula axial fan that induced drafts, and the cold air that passes heat exchanger tube bank and formula axial fan that induced drafts passes through kinetic energy recovery formula guide duct and discharges. The kinetic energy recovery type air duct is an air guide device capable of recovering kinetic energy, is smooth in interior, and can further reduce energy consumption of a fan, and outlet air flow is uniform and smooth.
The utility model discloses still carried out improved design to supporting platform, supporting platform includes bearing frame, heat exchanger tube bank support and fan support, the bearing frame is the truss structure, locates on the support column, and on the bearing frame was located to heat exchanger tube bank support and fan support, the heat exchanger tube bank support was used for fixed heat exchanger tube bank, and the fan support is used for supporting the formula axial fan that induced drafts that sets up in the heat exchanger tube bank top.
The utility model discloses the height of well support column is according to the environment and the unit capacity adjustment of construction ground, as before, the utility model discloses a formula axial fan induced drafts, and the fan setting is at the high-order, and the cold air is admitted air smoothly, adopts lower height can satisfy steam cooling system's requirement of admitting air, the utility model discloses reduce the height of support column, can reduce initial construction cost to reduce the adverse effect of crosscut wind to this system, cancel the deep bead among the traditional steam cooling system, can further reduce construction cost.
Compared with the prior art, the utility model discloses an useful part lies in: the utility model provides a direct steam cooling system of formula of induced drafting, adopt the method of high-order formula axial fan that induced drafts that sets up, improve the distribution condition of cold air, improve heat exchange efficiency, set up kinetic energy recovery formula guide duct, reduce steam cooling system's running cost, reduce the area of building steam cooling system, and simultaneously, reduce the height of support column, save the cost of steam cooling system initial stage construction by a wide margin, and lower support column can also reduce the interference influence of crosscut wind to steam cooling system, improve steam cooling system's stability.
Drawings
Fig. 1 is a front view of the present invention;
fig. 2 is a top view of the present invention;
FIG. 3 is a front view of the support platform of the present invention;
FIG. 4 is a front view of a conventional steam cooling system;
FIG. 5 is a top view of a conventional steam cooling system;
fig. 6 is a top view of a suction axial fan and two sets of heat exchanger bundles.
The meaning of the reference numerals: the system comprises a suction type axial flow fan 1, a heat exchange tube bundle 2, a steam distribution pipeline 3, a condensate water collecting pipeline 4, a support platform 5, a support column 6, a heat exchange tube 7, a kinetic energy recovery type air guide cylinder 8, a bearing frame 9, a heat exchange tube bundle support 10 and a fan support 11.
The present invention will be further described with reference to the accompanying drawings and the detailed description.
Detailed Description
Embodiment 1 of the utility model: as shown in fig. 1, an induced draft direct steam cooling system includes an induced draft axial flow fan 1, eighteen heat exchange tube bundles 2, a steam distribution pipeline 3, a condensed water collection pipeline 4, a support platform 5 and a support column 6. As shown in fig. 6, the heat exchange tube bundles 2 are arranged on the supporting platform 5, each group of heat exchange tube bundles 2 is composed of six heat exchange tubes 7 which are arranged in parallel, a gap is left between the heat exchange tubes 7, so that cold air can pass through the gaps conveniently, and the distance between the heat exchange tubes 7 in the same group of heat exchange tube bundles 2 is 0.2 mm. One end of the heat exchange tube 7 is connected to the steam distribution pipeline 3, steam generated by boiler combustion enters the heat exchange tube 7 along the steam distribution pipeline 3, the other end of the heat exchange tube 7 is connected to the condensed water collection pipeline 4, the steam completes heat exchange in the heat exchange tube 7, and is condensed into water, and the condensed water flows into the condensed water collection pipeline 4 to be collected uniformly. Air suction type axial flow fan 1 is arranged above heat exchange tube bundle 2, support column 6 is arranged below support platform 5, and height of support column 6 is 8 m.
As shown in fig. 1 and fig. 2, in the present embodiment, there are 9 air-suction axial fans 1 arranged in a square, and each air-suction axial fan 1 supplies cold air to two sets of heat exchange tube bundles 2, and there are 18 sets of heat exchange tube bundles 2. The heat exchange tube 7 in the heat exchange tube bundle 2 is obliquely arranged on the supporting platform, the acute angle formed by the heat exchange tube 7 and the horizontal direction is 60 degrees, the higher end of the heat exchange tube 7 is connected on the steam distribution pipeline 3, and the lower end of the heat exchanger 7 is connected on the condensed water collecting pipeline 4. The heat exchange tubes 7 in two sets of adjacent heat exchange tube bundles 2 incline to both sides respectively, and heat exchange tube bundles 2 become the V font and arrange, and formula of induced drafting axial fan 1 sets up the top between two sets of adjacent heat exchange tubes 7, and the higher one end of heat exchange tube 7 all inclines to the outside in these two sets of adjacent heat exchange tube bundles 2, and formula of induced drafting axial fan 1 is to providing cold air for these two sets of heat exchange tube bundles 2.
Embodiment 2 of the utility model: as shown in fig. 1, an induced draft direct steam cooling system includes an induced draft axial flow fan 1, a heat exchange tube bundle 2, a steam distribution pipeline 3, a condensed water collection pipeline 4, a support platform 5, a support column 6 and a kinetic energy recovery type air guide duct 8. As shown in fig. 6, the heat exchange tube bundle 2 is fixedly arranged on the supporting platform 5, the heat exchange tube bundle 2 is composed of six heat exchange tubes 7 which are arranged in parallel, a gap is left between the heat exchange tubes 7 for allowing cold air to pass through, and the distance between the heat exchange tubes 7 in the same group of heat exchange tube bundles 2 is 0.5 mm. The heat exchange tube 7 is obliquely arranged, the higher end of the heat exchange tube is connected to the steam distribution pipeline 3, steam generated by boiler combustion enters the heat exchange tube 7 along the steam distribution pipeline 3, the lower end of the heat exchange tube 7 is connected to the condensate water collection pipeline 4, the steam completes heat exchange in the heat exchange tube 7 and is condensed into water, and the condensate water flows into the condensate water collection pipeline 4 to be collected uniformly. Air suction type axial flow fan 1 is arranged above heat exchange tube bundle 2, support column 6 is arranged below support platform 5, and height of support column 6 is 9 m. The kinetic energy recovery type air duct 8 is arranged at an air outlet of the air suction type axial flow fan 2, air which is subjected to heat exchange is discharged, the kinetic energy recovery type air duct 8 can prevent heat exchange from being completed, air with increased temperature enters the steam cooling system from the lower side again, the heat exchange effect is reduced, kinetic energy can be recovered, and the energy consumption of the system is reduced.
As shown in fig. 1 and fig. 2, in the present embodiment, there are 9 air-suction axial fans 1 arranged in a square, and each air-suction axial fan 1 supplies cold air to two sets of heat exchange tube bundles 2, and there are 18 sets of heat exchange tube bundles 2. The heat exchange tubes 7 in the heat exchange tube bundle 2 are obliquely arranged on the supporting platform, the acute angle formed by the heat exchange tubes 7 and the horizontal direction is 70 degrees, the higher end of the heat exchange tubes 7 is connected to the steam distribution pipeline 3, and the lower end of the heat exchanger 7 is connected to the condensed water collection pipeline 4. The heat exchange tubes 7 in two sets of adjacent heat exchange tube bundles 2 incline to both sides respectively, and heat exchange tube bundles 2 become the V font and arrange, and formula of induced drafting axial fan 1 sets up the top between two sets of adjacent heat exchange tubes 7, and the higher one end of heat exchange tube 7 all inclines to the outside in these two sets of adjacent heat exchange tube bundles 2, and formula of induced drafting axial fan 1 is to providing cold air for these two sets of heat exchange tube bundles 2.
Embodiment 3 of the utility model: as shown in fig. 1, an induced draft direct steam cooling system includes an induced draft axial flow fan 1, a heat exchange tube bundle 2, a steam distribution pipeline 3, a condensed water collection pipeline 4, a support platform 5, a support column 6 and a kinetic energy recovery type air guide duct 8. As shown in fig. 6, the heat exchange tube bundles 2 are fixedly arranged on the supporting platform 5, each heat exchange tube bundle 2 is composed of six heat exchange tubes 7 which are arranged in parallel, a gap is reserved between the heat exchange tubes 7, so that cold air can pass through the gaps conveniently, and the distance between the heat exchange tubes 7 in the same heat exchange tube bundle 2 is 1 mm. The heat exchange tube 7 is obliquely arranged, the higher end of the heat exchange tube is connected to the steam distribution pipeline 3, steam generated by boiler combustion enters the heat exchange tube 7 along the steam distribution pipeline 3, the lower end of the heat exchange tube 7 is connected to the condensate water collection pipeline 4, the steam completes heat exchange in the heat exchange tube 7 and is condensed into water, and the condensate water flows into the condensate water collection pipeline 4 to be collected uniformly. Air suction type axial flow fan 1 is arranged above heat exchange tube bundle 2, support column 6 is arranged below support platform 5, and height of support column 6 is 10 m. The kinetic energy recovery type air duct 8 is arranged at an air outlet of the air suction type axial flow fan 2, air which is subjected to heat exchange is discharged, the kinetic energy recovery type air duct 8 can prevent heat exchange from being completed, air with increased temperature enters the steam cooling system from the lower side again, the heat exchange effect is reduced, kinetic energy can be recovered, and the energy consumption of the system is reduced.
As shown in fig. 1 and fig. 2, in the present embodiment, there are 9 air-suction axial fans 1 arranged in a square, and each air-suction axial fan 1 supplies cold air to two sets of heat exchange tube bundles 2, and there are 18 sets of heat exchange tube bundles 2. The heat exchange tube 7 in the heat exchange tube bundle 2 is obliquely arranged on the supporting platform, the acute angle formed by the heat exchange tube 7 and the horizontal direction is 60 degrees, the higher end of the heat exchange tube 7 is connected on the steam distribution pipeline 3, and the lower end of the heat exchanger 7 is connected on the condensed water collecting pipeline 4. The heat exchange tubes 7 in two sets of adjacent heat exchange tube bundles 2 incline to both sides respectively, and heat exchange tube bundles 2 become the V font and arrange, and formula of induced drafting axial fan 1 sets up the top between two sets of adjacent heat exchange tubes 7, and the higher one end of heat exchange tube 7 all inclines to the outside in these two sets of adjacent heat exchange tube bundles 2, and formula of induced drafting axial fan 1 is to providing cold air for these two sets of heat exchange tube bundles 2.
As shown in fig. 3, the supporting platform 5 in this embodiment includes a bearing frame 9, a heat exchange tube bundle support 10 and a fan support 11, where the bearing frame 9 is a truss structure and is disposed on the supporting column 6, the heat exchange tube bundle support 10 and the fan support 11 are disposed on the bearing frame 9, the heat exchange tube bundle support 10 is used to support and fix the heat exchange tube bundle 2, and the fan support 11 is used to support the air-suction type axial flow fan 1. The bearing frame 9, the heat exchange tube bundle support 10 and the fan support 11 are connected and fixed through bolts, and are convenient to assemble and disassemble. The air suction type axial flow fan 1 and the two groups of heat exchange tube bundles 2 form a heat exchange unit with the corresponding bearing frame 9, the heat exchange tube bundle support 10 and the fan support 11, as shown in fig. 2, a plurality of heat exchange units are combined into a steam cooling system, the installation is convenient, and the construction period of the steam cooling system can be greatly shortened.
The utility model discloses a theory of operation: as shown in fig. 4 and 5, the conventional steam cooling system provides cold air to the heat exchange tube bundle 2 by using a low-position arrangement method of a blower type axial flow fan, which may cause uneven distribution of the cold air between the heat exchange tube bundles 2, especially, the position near the bottom of the heat exchange tube 7 may hardly contact the cold air, the heat exchange effect is poor, the fan power needs to be increased, and the heat exchange tube bundle 2 needs to be increased to meet the requirements of the power plant. In addition, because the fan-type axial flow fan is arranged below the heat exchange tube bundle 2, in order to ensure smooth air intake, the supporting column 6 needs to be arranged higher and is generally more than 15m, so that the supporting platform 5 is too high, the interference influence of cross-cut air on the steam cooling system is increased, and the heat exchange efficiency is further reduced. The utility model discloses change formula axial fan that induced drafts 1 with blast type axial fan to the setting can enough improve the distribution of cold air in heat exchanger tube bank 2 top, improves heat exchange efficiency, and formula axial fan high-order setting induced drafts moreover admits air smoothly, can reduce support column 6's height, can save steam cooling system's initial construction expense by a wide margin.
Example 3 is compared to a conventional steam cooling system as shown in the following table:
Figure DEST_PATH_GDA0002240268310000051
known by last table, same design condition, and under the same condition of fan power consumption, induced air formula's arrangement scheme can realize saving heat transfer area about 1 ten thousand square meters, is original 2.42%, practices thrift about 100 tons of steel construction, is original about 11.45%, and the air cooling platform height has reduced 5 meters, and it is right to violently cut the wind the utility model discloses an influence is also littleer.

Claims (7)

1. The utility model provides an induced draft formula direct steam cooling system which characterized in that: the steam-cooled steam generator comprises an air suction type axial flow fan (1), a plurality of groups of heat exchange tube bundles (2), a steam distribution pipeline (3), a condensate water collection pipeline (4), a support platform (5) and support columns (6), wherein the heat exchange tube bundles (2) are arranged on the support platform (5), the heat exchange tube bundles (2) are composed of a plurality of heat exchange tubes (7), one ends of the heat exchange tubes (7) are connected to the steam distribution pipeline (3), and the other ends of the heat exchange tubes (7) are connected to the condensate water collection pipeline (4); the air suction type axial flow fan (1) is arranged above the heat exchange tube bundle (2), and the support column (6) is arranged below the support platform (5).
2. The aspiration direct steam cooling system of claim 1, further comprising: the heat exchange tubes (7) in each group of heat exchange tube bundles (2) are arranged in parallel and are obliquely arranged on the supporting platform (5), the higher ends of the heat exchange tubes (7) are connected with the steam distribution pipeline (3), and the lower ends of the heat exchange tubes (7) are connected with the condensed water collecting pipeline (4); the heat exchange tubes (7) in two adjacent groups of heat exchange tube bundles (2) are respectively inclined towards two sides.
3. The aspiration direct steam cooling system of claim 2, further comprising: the air suction type axial flow fan (1) is arranged above the space between the two adjacent groups of heat exchange tube bundles (2), the heat exchange tubes (7) in the two adjacent groups of heat exchange tube bundles (2) are inclined outwards, and the joints of the heat exchange tubes (7) and the steam distribution pipeline (3) are far away from the air suction type axial flow fan (1).
4. The aspiration direct steam cooling system of claim 2, further comprising: the distance between the heat exchange tubes (7) in each group of heat exchange tube bundles (2) is 0.2mm-1 mm.
5. The aspiration direct steam cooling system of claim 1, further comprising: the device is characterized by further comprising a kinetic energy recovery type air duct (8), wherein the kinetic energy recovery type air duct (8) is connected with the top end of the air suction type axial flow fan (1).
6. The aspiration direct steam cooling system of claim 1, further comprising: supporting platform (5) are including bearing frame (9), heat exchanger tube bank support (10) and fan support (11), bearing frame (9) are the truss structure, locate on support column (6), and on bearing frame (9) was located in heat exchanger tube bank support (10) and fan support (11), on heat exchanger tube bank support (10) was located in heat exchanger tube bank (2), on fan support (11) was located in induced-draught axial fan (1).
7. The aspiration direct steam cooling system of claim 2, further comprising: the acute angle formed by the heat exchange tube (7) and the horizontal direction ranges from 54 degrees to 72 degrees.
CN201921117365.7U 2019-07-16 2019-07-16 Air suction type direct steam cooling system Active CN210543450U (en)

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