CN101476823A - Internal steam conduction apparatus of direct air cooling branch-shaped exhaustion duct system - Google Patents
Internal steam conduction apparatus of direct air cooling branch-shaped exhaustion duct system Download PDFInfo
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- CN101476823A CN101476823A CNA2009100771677A CN200910077167A CN101476823A CN 101476823 A CN101476823 A CN 101476823A CN A2009100771677 A CNA2009100771677 A CN A2009100771677A CN 200910077167 A CN200910077167 A CN 200910077167A CN 101476823 A CN101476823 A CN 101476823A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/15—On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply
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Abstract
The invention discloses a flow guide device in a direct air cooling branch-shaped exhaust duct system, which is applied in the field of heat energy power engineering. The device solves the problem of even flow distribution of steam exhaust of a steam turbine among various steam distribution pipes. The device prevents the danger of the freezing of a direct air cooled condenser which is possibly caused by the unreasonable design of the direct air cooling branch-shaped exhaust duct system, and ensures safe operation of the steam turbine in winter. The device ensures that a system prevents the pressure loss of water vapor from being overhigh and the supercooling area from being overlarge, prevents the reduction of heat exchange amount, and reduces the thermal efficiency of power plants when realizing the even distribution of the flow of water vapor. The device fully plays the cooling capacity of various parts of the direct air cooled condenser, and ensures that the steam turbine runs economically in other seasons. For realizing the even distribution of the flow of the water vapor, the distribution of the area of a diversion cross-section depends on the resistances of two branch pipe sections, and a branch pipe with a high resistance should obtain larger diversion area. The device is mainly used for steam diversion and cooling systems of power stations, petrochemical industry, and the like.
Description
Technical field
The present invention is a guiding device in the dendritic blow-off line of a kind of Direct Air-Cooled system, is applied to Thermal Power Engineering, thermal power engineering field.
Background technology
Air cooling is the main type of cooling of " rich coal lack of water " regional thermal power plant, and it has changed the passive situation of original " fixed with water ", the today at the water resource growing tension, has great importance.Power industry is the resource consumption rich and influential family, along with water resource lacks, improve the production of electric power and service efficiency, reduction consumption, particularly save and reduce water resource, consumption of petroleum resources, to the saving of Chinese grand strategy resource with distribute rationally and be significant.According to Chinese Eleventh Five-Year Plan electric power development planning, China's electrical production in the period of quite growing future is still the general layout based on the coal electricity.China Shanxi, Shaanxi, Ningxia, West Inner Mongolia are the coal resources enrichments, and water resource lacks the area.Cause thermoelectricity power supply point layout unreasonable, the development ﹠ construction of western part of China mining area, electric power stations near coal-mines are slow relatively.The Eleventh Five-Year Plan period, China builds the big moulded coal electricity of active development base near coal-mine big unit and begins to take shape scale, and the electric power stations near coal-mines ratio reaches 47%.For coal-fired thermoelectricity, adopt water saving measures such as Air-cooled Unit, will solve the generating water shortage problem of electric power stations near coal-mines to a great extent.
The air cooling application except that coal-fired station, has expanded fuel gas-steam circulation power station, rubbish power station, industrial enterprise's private station etc. to.From the climatic condition aspect, the power station air cooling technology not only is applied to the arid area, desert, and is applied to area plentifully, water source; Not only be applied to the hot area, and be applied to cold district.Range of application constantly enlarges, promise well.
Steam discharge uniform distribution with steam turbine is being undertaken to each steam-distributing pipe by Direct Air-Cooled blow-off line system, and enters the task of direct air cooled condenser cooling.The quality of Direct Air-Cooled blow-off line system design is directly connected to the cooling effect of direct air cooled condenser (ACC, Air Cooled Condenser) and safety, the economical operation of direct air cooling system.
The arrangement of Direct Air-Cooled blow-off line system has experienced low level layout, the high-order layout and dendritic layout.Dendritic arrangement has plurality of advantages, just progressively is applied in the Direct Air-Cooled power plant construction.Publication number CN1576520A, the disclosed name of open day 2005.2.9 is called and relates to the content that steam flow distributes in " the steam discharge delivery pipe of apparatus of steam power plants ".The guiding device of this invention adopts steam circulation area equisection method, can't solve steam flow uniform distribution problem, brings adverse influence will for the safety and the economical operation of direct air cooled condenser.
The quality of Direct Air-Cooled blow-off line system design is related to the cooling effect of direct air cooled condenser and safety, the economical operation of direct air cooling system.Whether the steam discharge distributed uniform, is related to direct air cooled condenser preventing freeze in winter and safe operation, and the back pressure of steam turbine economical operation.
Summary of the invention
Technical problem to be solved by this invention is: guarantee water vapour uniform distribution between each steam-distributing pipe of dendritic blow-off line system, and reduce the resistance that flows as far as possible.
The present invention adopts following technical scheme for guaranteeing the uniform distribution of flow between each steam-distributing pipe of Direct Air-Cooled:
This device comprises threeway and guide vane.The threeway inlet face is vertical with the steam flow direction with exit face, and the steam flow direction is a z axle positive direction.
Threeway inlet face outline line is a circle.Section has two intersection points in the middle of circular wheel profile and the Direct Air-Cooled blow-off line system.The left side intersection point is the O point, and the right side intersection point is the C point.With the O point is initial point, is x axle positive direction along the OC direction.The x axle is rotated counterclockwise 90 degree, places the O point, determine the y axle.
The intersection of guide vane and threeway inlet face is a line segment; D is a threeway inlet face internal diameter of the pipeline; Guide vane and inlet face intersection are positioned at the x direction of principal axis greater than 0.5d, smaller or equal to the position of 0.65d, and parallel with the y axle, this position is the original position or the final position of guide vane;
The water conservancy diversion direction (bearing of trend) of guide vane is along the laying direction of higher drag arm in the Direct Air-Cooled blow-off line system.The length of guide vane is extended along the water conservancy diversion direction.The guide vane integral solder is on the tube wall of threeway inside.
Guide vane changes along the length on the water conservancy diversion direction, and length intercepts along the water conservancy diversion direction: the shortest guide vane should be more than or equal to 0.4d along the length of water conservancy diversion direction; The longest guide vane, an end originate in threeway inlet face position, and the other end ends at threeway exit face position; Or original position, final position are exchanged.
Technique scheme is based on following reason:
1) threeway place of dendritic blow-off line system must be provided with guiding device, could guarantee the uniform distribution of water vapour.The key of Direct Air-Cooled blow-off line system design is the threeway design in the blow-off line system.
2) optimal design of each threeway of dendritic blow-off line system is interrelated, should unify in the design to consider.Connect each other between each threeway of Direct Air-Cooled blow-off line system, close fit.The design of each threeway not only influences self resistance and system's drag overall, and influences the water conservancy diversion effect and the overall system assignment of traffic of other threeways.
3) the area equipartition principle can not solve the problem of dendritic blow-off line system steam flow uniform distribution.The prerequisite of simple geometry shunting principle is the even or symmetry that flows of incoming flow velocity flow profile, and the downstream flow situation is roughly the same.Therefore, at the dendritic blow-off line of different Direct Air-Cooled system, must carry out detailed optimal design.
4) to realize the uniform distribution of steam flow, divide the area distributions of flow section to depend on the resistance of two branch's pipeline sections.The branched pipe of high-drag should obtain bigger diversion area.
5) multi-form dendritic blow-off line system should carry out detailed optimal design.
6) the straight guide vane that is adopted in the optimization can also be converted into the circular arc guide vane, and the design basic ideas are constant.
The present invention compares the beneficial effect that is had with prior art:
The invention solves the flow uniform distribution problem of exhaust steam in steam turbine between each steam-distributing pipe.Prevent that because the design of blow-off line system is improper, the danger that the direct air cooled condenser that may cause is freezed guarantees steam turbine safe operation in the winter time.The assurance system prevents that the water vapour crushing is too high in the uniform distribution that realizes steam rates, it is long-pending excessive to cross huyashi-chuuka (cold chinese-style noodles), causes the heat exchange amount to reduce, and has reduced the thermal efficiency of power plant.Given full play to the cooling capacity of direct air cooled condenser each several part, guaranteed that steam turbine is in other economical operation in season.
Description of drawings
Fig. 1 is a guiding device short blade profile in the dendritic blow-off line of the Direct Air-Cooled system;
Fig. 2 is a guiding device linear leaf profile in the dendritic blow-off line of the Direct Air-Cooled system;
Fig. 3 is the position view of guide vane at the threeway inlet face;
Fig. 4 is a guide vane length schematic diagram;
Fig. 5 is the instance graph of certain dendritic blow-off line system.
The specific embodiment
The present invention will be further described in conjunction with the accompanying drawings.
Fig. 1 and Fig. 2 are respectively guiding device short blade and linear leaf profile in the dendritic blow-off line of the Direct Air-Cooled system.Main blow-off line is divided into two blow-off lines, and each blow-off line branch again is two blow-off lines, is called the steam discharge distributing pipe.Assignment of traffic relies on the interior guiding device of the dendritic blow-off line of Direct Air-Cooled to realize.
Guiding device comprises threeway 1 and guide vane 2 in the dendritic blow-off line of the Direct Air-Cooled system.
As shown in Figure 3, threeway 1 inlet face is vertical with the steam flow direction with exit face, and the steam flow direction is a z axle positive direction.Threeway 1 inlet face outline line is a circle.Suppose that threeway 1 inlet face internal diameter of the pipeline is d.Section has two intersection points in the middle of circular wheel profile and the Direct Air-Cooled blow-off line system.The left side intersection point is the O point, and the right side intersection point is the C point.With the O point is initial point, is x axle positive direction along the OC direction.The x axle is rotated counterclockwise 90 degree, places the O point, determine the y axle.
The water conservancy diversion direction of guide vane 2 is along the laying direction of higher drag arm in the Direct Air-Cooled blow-off line system.Guide vane 2 integral solder are on the tube wall of threeway 1 inside.
Be illustrated in figure 5 as certain Direct Air-Cooled blow-off line and adopt dendritic arrangement, main blow-off line diameter is 6.0m, and branching into diameter is two arms of 4.2m, and four steam-distributing pipe diameters are 3.0m; The spacing of each steam-distributing pipe is 11.31m.
The position of guide vane 2 lays respectively at 0.58d, 0.55d and 0.65d, and the numerical experimentation result of assignment of traffic and passage pressure drop is as shown in the table.By table as seen, the flow of each steam-distributing pipe and the deviation of target flow are no more than 5.5%, and assignment of traffic is even substantially.As seen, when the position of guide vane 2 is positioned at greater than 0.50d, smaller or equal between the 0.65d time, can realize the uniform distribution of flow between each steam-distributing pipe.
The assignment of traffic table of the dendritic blow-off line of Direct Air-Cooled system under certain operating mode
To the further fine setting of guide vane 2 positions, length and direction, can guarantee average assignment of traffic fully.Example shows, adopts the technical program can solve the problem of steam flow uniform distribution between each distributing pipe fully.
The position of guide vane is greater than 0.50d, between 0.65d.How much shunting principles can't solve flow uniform distribution problem, and pipe centerline should be departed from the position of guide vane, and its lower position is 0.50d.
The size of deviation position is decided by the drag losses between the different laterals.Drag losses difference between the lateral is big more, and deviation position is also big more.For Direct Air-Cooled blow-off line system,, therefore, be limited to 0.65d on the guide vane installation site because the drag losses difference between each steam-distributing pipe is little.
When the deviation position of guide vane surpasses 0.65d, the assignment of traffic uneven phenomenon that also can occur.At this moment, the flow of the lateral that resistance is big is higher than the little lateral steam flow of resistance on the contrary.
Be the even or local fine setting that guarantees that shunting back fluid velocity distributes, the two parts after the shunting can be provided with several auxiliary guide vanes again.
Claims (3)
1. guiding device in the dendritic blow-off line of the Direct Air-Cooled system, it is characterized in that: this device comprises threeway (1) and guide vane (2); The inlet face of threeway (1) is vertical with the steam flow direction with exit face; The steam flow direction is a z axle positive direction;
Guide vane (2) is a line segment with the intersection of threeway (1) inlet face; D is threeway (a 1) inlet face internal diameter of the pipeline; Guide vane (2) is positioned at the x direction of principal axis greater than 0.5d with the inlet face intersection, smaller or equal to the position of 0.65d, and parallel with the y axle, this position is position (a);
The water conservancy diversion direction of guide vane (2) is along the laying direction of higher drag arm in the Direct Air-Cooled blow-off line system; Guide vane (2) integral solder is on the inner tube wall of threeway (1).
2. guiding device in the dendritic blow-off line of Direct Air-Cooled according to claim 1, it is characterized in that: guide vane (2) originates in position (a) and ends at position (b); Guide vane (2) extends along the water conservancy diversion direction is crooked gradually; Guide vane (2) changes along the length on the water conservancy diversion direction; The length of guide vane (2) intercepts along the water conservancy diversion direction on demand: the shortest guide vane (2) should be more than or equal to 0.4d along the length of water conservancy diversion direction; The longest guide vane (2), an end originate in position (a) to be located, and the other end ends at the position (b) of threeway (1) exit face and locates.
3. guiding device in the dendritic blow-off line of Direct Air-Cooled according to claim 2, it is characterized in that: guide vane (2) originates in position (b), ends at position (a).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100771677A CN101476823A (en) | 2009-01-19 | 2009-01-19 | Internal steam conduction apparatus of direct air cooling branch-shaped exhaustion duct system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100771677A CN101476823A (en) | 2009-01-19 | 2009-01-19 | Internal steam conduction apparatus of direct air cooling branch-shaped exhaustion duct system |
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| CN101476823A true CN101476823A (en) | 2009-07-08 |
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| CNA2009100771677A Pending CN101476823A (en) | 2009-01-19 | 2009-01-19 | Internal steam conduction apparatus of direct air cooling branch-shaped exhaustion duct system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102809305A (en) * | 2012-08-21 | 2012-12-05 | 哈尔滨工业大学（威海） | Steam distribution device for direct air-cooled condenser for power station |
| CN101704064B (en) * | 2009-09-28 | 2013-02-13 | 侯马市模范机械制造有限公司 | Z-shaped tower type highly-efficient dry sand cooling device with internal water-cooled tube and external water-cooled tube |
| CN109323599A (en) * | 2018-10-19 | 2019-02-12 | 华北电力大学 | A kind of direct air cooling unit with internal diversion device |
| CN110959065A (en) * | 2017-08-15 | 2020-04-03 | 三菱日立电力系统株式会社 | Steam turbine |
-
2009
- 2009-01-19 CN CNA2009100771677A patent/CN101476823A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101704064B (en) * | 2009-09-28 | 2013-02-13 | 侯马市模范机械制造有限公司 | Z-shaped tower type highly-efficient dry sand cooling device with internal water-cooled tube and external water-cooled tube |
| CN102809305A (en) * | 2012-08-21 | 2012-12-05 | 哈尔滨工业大学（威海） | Steam distribution device for direct air-cooled condenser for power station |
| CN110959065A (en) * | 2017-08-15 | 2020-04-03 | 三菱日立电力系统株式会社 | Steam turbine |
| CN110959065B (en) * | 2017-08-15 | 2022-04-01 | 三菱动力株式会社 | Steam turbine |
| CN109323599A (en) * | 2018-10-19 | 2019-02-12 | 华北电力大学 | A kind of direct air cooling unit with internal diversion device |
| CN109323599B (en) * | 2018-10-19 | 2020-04-10 | 华北电力大学 | Direct air cooling unit with internal flow guide device |
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Open date: 20090708 |