CN102829647A - Finned-tube bundle freezing prevention device for direct air-cooling unit of power station - Google Patents
Finned-tube bundle freezing prevention device for direct air-cooling unit of power station Download PDFInfo
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- CN102829647A CN102829647A CN2012103511048A CN201210351104A CN102829647A CN 102829647 A CN102829647 A CN 102829647A CN 2012103511048 A CN2012103511048 A CN 2012103511048A CN 201210351104 A CN201210351104 A CN 201210351104A CN 102829647 A CN102829647 A CN 102829647A
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- nylon wire
- nylon net
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Abstract
The invention relates to a finned-tube bundle freezing prevention device for a direct air-cooling unit of a power station. The freezing prevention device comprises an inverted-V-shaped finned-tube bundle and an axial flow cooling fan, wherein the axial flow cooling fan is arranged just below the inverted-V-shaped finned-tube bundle through a fan bridge frame, the fan bridge frame below the inverted-V-shaped finned-tube bundle is provided with a conical support, a nylon net is sleeved on the outer side of the conical support and comprises an upper layer nylon net, a middle layer nylon net and a lower layer nylon net, and the porosities of the upper layer nylon net, the middle layer nylon net and the lower layer nylon net are reduced gradually. The finned-tube bundle freezing prevention device provided by the invention is reasonable in construction, firm in connection and easy to disassemble and assemble, can effectively improve the distribution of cold air in the air cooling unit, fulfills the purpose that the headwind speed of the finned-tube bundle is gradually reduced from top to bottom, does not completely hinder inlet air at a fan, and can effectively alleviate the situation that the middle and lower parts of the tube bundle are easy to freeze in winter and improve the security and economy of the operation of the unit.
Description
Technical field
The invention belongs to the energy source and power technical field, particularly a kind of power station direct air-cooling unit finned-tube bundle defroster.
Background technology
In northern China, can near coal-mine power plant location water resource serious lack especially be difficult to bear big water consumption in dry season more, thereby have influence on the problem that build power plant.Direct Air-Cooling Technology; Because the water saving characteristics that it is outstanding; Can solve the bottleneck problem of water resource well, the used Direct Air-Cooled of this technology island comprises tens air cooling blower fans by column-row arrangement, utilizes surrounding air that direct air cooled condenser is carried out forced-convection heat transfer.It is air cooling tubes condenser unit (being called for short the air cooling unit) that the minimum of direct air cooled condenser is formed unit; Tens air cooling unit are arranged according to some row several rows; Form air cooling tubes condenser (air cooling island), each row comprises one tunnel horizontal steam-distributing pipe, the horizontal condensate collecting pipe of two-way.Each unit is made up of one tunnel horizontal steam-distributing pipe, the horizontal condensate collecting pipe of two-way, " Λ " type finned-tube bundle and an axial flow cooling blower.Axial flow cooling blower and drive motors thereof are installed under " Λ " type finned-tube bundle through fan bridge.The course of work of air cooling unit is: steam is sent into the condenser finned-tube bundle by the vapor level distributing pipe; The axial flow cooling blower forces cold air to flow through in the condenser finned-tube bundle outside; Saturated vapor in the finned tube is condensed into condensate, and condensed water runs down comes together in the condensate collecting pipe.
Because NORTHWEST CHINA area winter climate is cold, chill temperature has reached-50 ℃.No matter find through the operation of power plant in recent years, be single row of tubes or multi coil, and some power plant all have the phenomenon of freezing in various degree to take place in the winter time.Freeze the position and mainly occur in the middle and lower part of finned-tube bundle, and be uneven freezing.For avoiding freezing, some power plant with the winter operation back pressure be provided with higher, even in the winter time for antifreeze or disappear and freeze insulation materials such as adding a cover cotton in the finned-tube bundle bottom and solved.And the wind speed profile of the inner cooling in air cooling unit air is for increasing from top to bottom gradually, and restrains the middle and lower part that the easy freezing position mainly occurs in tube bank.
Also not to improving the inner cold air assignment of traffic in air cooling unit, increase the blower fan resistance to flow output, so far to improve the correlative study content of restraining middle and lower part easy freezing problem winter.
Summary of the invention
Technical problem to be solved by this invention is to propose a kind of structure rationally; Be connected firmly, be easy to dismounting, can effectively improve the distribution of the inner cold air in air cooling unit; Realize the purpose that the finned-tube bundle face velocity reduces from top to bottom gradually; And not exclusively hinder the air intake of fans entrance, effectively improve and restrain middle and lower part easy freezing problem winter, improve the power station direct air-cooling unit finned-tube bundle defroster of unit operation security and economy.
The technical scheme that the present invention solves the problems of the technologies described above employing is: a kind of power station direct air-cooling island finned-tube bundle defroster; It includes " Λ " type finned-tube bundle and axial flow cooling blower; The axial flow cooling blower is installed under " Λ " type finned-tube bundle through fan bridge; It is characterized in that: said " Λ " type finned-tube bundle below fan bridge is provided with a conical stent, and the conical stent outside is set with nylon wire.
Said nylon wire comprises upper strata nylon wire, middle level nylon wire, lower floor's nylon wire, and the porosity of said upper strata nylon wire, middle level nylon wire, lower floor's nylon wire is descending successively.
Conical stent base diameter according to the invention equates that with the blower fan cylindrical shell outlet diameter of axial flow cooling blower the bus of conical stent and bottom surface angle are between 35 °-60 °.
The conical net that the present invention is made up of the nylon wire of three layers of different porosities, mounting arrangements be blower fan exit, condenser air cooling unit on the air cooling island.Whether size decision according to environment temperature is used.The invention has the advantages that; Under the cold snap, according to existing meteorologic parameter, finding needs antifreeze date range in the winter time; In this scope; Device of the present invention is rack-mount, realize that through the assignment of traffic that changes cold air and the resistance of increasing export the low temperature cold air enters into the probability of tube bank bottom, reaches antifreeze purpose.The present invention uses flexibly, can choose the upper, middle and lower-ranking nylon wire according to the height of environment temperature and work simultaneously, in, the following antifreezing measures of two-layer nylon wire work or lower floor's nylon wire work; When environment temperature is high slightly, can the upper strata nylon wire be taken off, reduce the blower fan resistance to flow output; When environment temperature continue to increase, again the middle level nylon wire is taken off, continue to reduce the blower fan resistance to flow output, when being elevated to, environment temperature do not need all nylon wires to be taken off when antifreeze; In a word, the present invention only uses when antifreeze, can the heat radiation on air cooling island not had a negative impact.
Description of drawings
Below in conjunction with accompanying drawing the present invention is further specified.
Fig. 1 is that the present invention assembles sketch map.
Fig. 2 is a conical stent structural representation of the present invention.
Fig. 3 is the simulation sketch map that air cooling of the present invention unit cooling air velocity vector is installed.
Fig. 4 is the simulation sketch map of air cooling unit cooling air velocity vector in the prior art.
Label among the figure is: 1. " Λ " type finned-tube bundle, 2. upper strata nylon wire, 3. middle level nylon wire, 4. conical stent, 5. lower floor's nylon wire, 6. axial flow cooling blower, 7. blower fan cylindrical shell, 8. fan bridge.
The specific embodiment
As can be seen from Figure 1; A kind of power station direct air-cooling island finned-tube bundle defroster; It includes " Λ " type finned-tube bundle 1 and axial flow cooling blower 6 etc., and axial flow cooling blower 6 and drive motors thereof are installed under " Λ " type finned-tube bundle 1 through fan bridge 8.In the air cooling unit between vapor level distributing pipe and " Λ " type finned-tube bundle 1, be connected through welding between " Λ " type finned-tube bundle 1 and the condensate collecting pipe, guarantee the air-tightness requirement, antirust processing is carried out on its surface." Λ " type finned-tube bundle 1 of each vapor level distributing pipe below, road laterally is provided with a brace summer.The above-mentioned prior art that belongs to no longer details.
Characteristics of the present invention are: said " Λ " type finned-tube bundle 1 below fan bridge 8 is provided with a conical stent 4, and conical stent 4 outsides are set with nylon wire.
Fig. 2 is the conical stent structural representation, and it is made up of longitudinal bracing 41 and annular brace 42, directly is welded on the fan bridge 8, and is corresponding with 7 outlets of blower fan cylindrical shell.Conical stent 4 materials are No. 45 round steel.Said conical stent 4 base diameters equate with blower fan cylindrical shell 7 outlet diameters of axial flow cooling blower 6; The bus of conical stent 4 and bottom surface angle have angle
, and they are between 35 °-60 °.
Said nylon wire comprises upper, middle and lower-ranking, is respectively upper strata nylon wire 2, middle level nylon wire 3, lower floor's nylon wire 5.The porosity of said upper strata nylon wire 2, middle level nylon wire 3, lower floor's nylon wire 5 is descending successively.That is to say that nylon wire 2 porositys in upper strata are maximum, lower floor's nylon wire 5 porositys are minimum, and nylon wire 3 porositys in middle level are between the two.Upper strata nylon wire 2, middle level nylon wire 3, lower floor's nylon wire 5 directly are sleeved on the conical stent 4, are connected firmly, and dismounting is easy.The upper, middle and lower-ranking nylon wire is the windproof net of nylon rope, plays a part windproof, antifreeze.
Mounting arrangements of the present invention is blower fan exit, condenser air cooling unit on the air cooling island, whether uses according to the size decision of environment temperature.The invention has the advantages that; Under the cold snap, according to existing meteorologic parameter, finding needs antifreeze date range in the winter time; In this scope; Device of the present invention is rack-mount, realize that through the assignment of traffic that changes cold air and the resistance of increasing export the low temperature cold air enters into the probability of tube bank bottom, reaches antifreeze purpose; The present invention uses flexibly, can choose three layers of nylon wire 2,3,5 according to the height of environment temperature and work simultaneously, the antifreezing measures of two-layer nylon wire 3,5 work or 5 work of individual layer nylon wire; When environment temperature is high slightly, can the superiors' nylon wire 2 be taken off, reduce the blower fan resistance to flow output; When environment temperature continue to increase, again middle level nylon wire 3 is taken off, continue to reduce the blower fan resistance to flow output, when being elevated to, environment temperature do not need all nylon wires to be taken off when antifreeze; In a word, the present invention only uses when antifreeze, can the heat radiation on air cooling island not had a negative impact.
Fig. 3 is the simulation sketch map that air cooling of the present invention unit cooling air velocity vector is installed.Fig. 4 is the simulation sketch map of air cooling unit cooling air velocity vector in the prior art.Visible by Fig. 3, Fig. 4, install the present invention additional after, the inner cold air distribution effects in air cooling unit obviously is superior to the distribution effects that prior art is not taken measures.Install additional behind the present invention the cooling air by water conservancy diversion to the middle and upper part, unit, reduced the probability that has freezed bottom the tube bank greatly.The present invention transfers and uses flexibly, and is easy to operate.The present invention is mainly used in high and cold weather in winter, and north of china in winter wind is big, and dust is many, because the material that the present invention is is the windproof net of nylon rope, therefore can also play certain dust suppression effect.
Claims (3)
1. power station direct air-cooling island finned-tube bundle defroster; It includes " Λ " type finned-tube bundle and axial flow cooling blower; The axial flow cooling blower is installed under " Λ " type finned-tube bundle through fan bridge; It is characterized in that: said " Λ " type finned-tube bundle below fan bridge is provided with a conical stent, and the conical stent outside is set with nylon wire.
2. power station direct air-cooling according to claim 1 island finned-tube bundle defroster; It is characterized in that: said nylon wire comprises upper strata nylon wire, middle level nylon wire, lower floor's nylon wire, and the porosity of said upper strata nylon wire, middle level nylon wire, lower floor's nylon wire is descending successively.
3. power station direct air-cooling according to claim 1 island finned-tube bundle defroster; It is characterized in that: said conical stent base diameter equates that with the blower fan cylindrical shell outlet diameter of axial flow cooling blower the bus of conical stent and bottom surface angle are between 35 °-60 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103511048A CN102829647A (en) | 2012-09-20 | 2012-09-20 | Finned-tube bundle freezing prevention device for direct air-cooling unit of power station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103511048A CN102829647A (en) | 2012-09-20 | 2012-09-20 | Finned-tube bundle freezing prevention device for direct air-cooling unit of power station |
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| CN102829647A true CN102829647A (en) | 2012-12-19 |
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| CN2012103511048A Pending CN102829647A (en) | 2012-09-20 | 2012-09-20 | Finned-tube bundle freezing prevention device for direct air-cooling unit of power station |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201306935Y (en) * | 2008-11-12 | 2009-09-09 | 江苏双良空调设备股份有限公司 | Wind-shielding blade-type wind shield for direct air-cooling condenser |
| CN202018208U (en) * | 2011-03-18 | 2011-10-26 | 哈尔滨空调股份有限公司 | Internal electric roller shutter freeze-proofing device for direct air cooling condenser A-shaped frame |
| CN202836257U (en) * | 2012-07-27 | 2013-03-27 | 中国电能成套设备有限公司 | Direct air cooling device for power station |
-
2012
- 2012-09-20 CN CN2012103511048A patent/CN102829647A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201306935Y (en) * | 2008-11-12 | 2009-09-09 | 江苏双良空调设备股份有限公司 | Wind-shielding blade-type wind shield for direct air-cooling condenser |
| CN202018208U (en) * | 2011-03-18 | 2011-10-26 | 哈尔滨空调股份有限公司 | Internal electric roller shutter freeze-proofing device for direct air cooling condenser A-shaped frame |
| CN202836257U (en) * | 2012-07-27 | 2013-03-27 | 中国电能成套设备有限公司 | Direct air cooling device for power station |
Non-Patent Citations (1)
| Title |
|---|
| 杨建国等: "加装导流网以改善横向风对直接空冷凝汽器的影响", 《中国电机工程学报》 * |
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Application publication date: 20121219 |