CN110812872A - Air suction type direct steam cooling system - Google Patents
Air suction type direct steam cooling system Download PDFInfo
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- CN110812872A CN110812872A CN201910640227.5A CN201910640227A CN110812872A CN 110812872 A CN110812872 A CN 110812872A CN 201910640227 A CN201910640227 A CN 201910640227A CN 110812872 A CN110812872 A CN 110812872A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D5/0027—Condensation of vapours; Recovering volatile solvents by condensation by direct contact between vapours or gases and the cooling medium
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Abstract
The invention discloses an air suction type direct steam cooling system which comprises an air suction type axial flow fan, a heat exchange tube bundle, a steam distribution pipeline, a condensate water collection pipeline, a supporting platform and a supporting column. 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 invention adopts a method of arranging the air suction type axial flow fan at a high position, improves the distribution condition of cold air, improves the heat exchange efficiency, arranges the kinetic energy recovery type air guide cylinder, reduces the operation cost, reduces the floor area for constructing the steam cooling system, simultaneously, is smooth recently, reduces the height of the support column, greatly saves the initial construction cost of the steam cooling system, and can reduce the interference influence of cross-cut air on the steam cooling system and improve the stability of the steam cooling system by the lower support column.
Description
Technical Field
The invention relates to the technical field of steam cooling and condensation of power plants, in particular to an air suction type 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.
Disclosure of Invention
The invention aims to provide an air suction type direct steam cooling system which can improve the heat exchange efficiency of the steam cooling system, reduce the operation cost and the initial construction cost, reduce the occupied area of equipment, reduce the influence of cross-cut air on the steam cooling system to a certain extent and improve the stability of the system.
In order to solve the technical problems, the invention adopts the 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, ventilation is facilitated, and the distance between the heat exchange tubes in the same heat exchange tube bundle is shortened. 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.
In order to further reduce energy consumption, the invention is also provided with a kinetic energy recovery type air duct, the kinetic energy recovery type air duct is connected with the top end of the air suction type axial flow fan, and cold air passing through the heat exchange tube bundle and the air suction type axial flow fan is discharged through the kinetic energy recovery type air duct. 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 invention also provides an improved design of the supporting platform, the supporting platform comprises a bearing frame, a heat exchange tube bundle support and a fan support, the bearing frame is of a truss structure and is arranged on the supporting column, the heat exchange tube bundle support and the fan support are arranged on the bearing frame, the heat exchange tube bundle support is used for fixing the heat exchange tube bundle, and the fan support is used for supporting the air suction type axial flow fan arranged above the heat exchange tube bundle.
The height of the supporting column is adjusted according to the environment of a construction place and the capacity of a unit, as mentioned above, the air suction type axial flow fan is adopted, the fan is arranged at a high position, cold air is smoothly fed, and the air inlet requirement of the steam cooling system can be met by adopting a lower height.
Compared with the prior art, the invention has the advantages that: 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 invention is further described with reference to the following figures and detailed description.
Detailed Description
Example 1 of the invention: 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 tubes 7 in the heat exchange tube bundle 2 are obliquely arranged on the supporting platform, the heat exchange tubes 7 and the horizontal direction form an acute angle, 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 condensate 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.
Example 2 of the invention: 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 heat exchange tubes 7 and the horizontal direction form an acute angle, 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 condensate 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.
Example 3 of the invention: 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 working principle of the invention is as follows: 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 invention changes the blast axial flow fan into the air suction axial flow fan 1 and is arranged above the heat exchange tube bundle 2, which not only can improve the distribution condition of cold air in the heat exchange tube bundle 2 and improve the heat exchange efficiency, but also has the advantages of high-position arrangement of the air suction axial flow fan, smooth air inlet, capability of reducing the height of the support column 6 and greatly saving the initial construction cost of the steam cooling system.
Example 3 is compared to a conventional steam cooling system as shown in the following table:
from the above table, under the same design conditions and under the same power consumption of the fans, the induced air type arrangement scheme can save about 1 ten thousand square meters of heat exchange area, which is about 2.42% of the original area, save about 100 tons of steel structure, which is about 11.45% of the original area, reduce the height of the air cooling platform by 5 meters, and have less influence on the invention by cross wind.
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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910640227.5A CN110812872A (en) | 2019-07-16 | 2019-07-16 | Air suction type direct steam cooling system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910640227.5A CN110812872A (en) | 2019-07-16 | 2019-07-16 | Air suction type direct steam cooling system |
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| Publication Number | Publication Date |
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| CN110812872A true CN110812872A (en) | 2020-02-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910640227.5A Pending CN110812872A (en) | 2019-07-16 | 2019-07-16 | Air suction type direct steam cooling system |
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| CN (1) | CN110812872A (en) |
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- 2019-07-16 CN CN201910640227.5A patent/CN110812872A/en active Pending
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