CN201293584Y

CN201293584Y - Air cooling island antifreezing heat radiator of direct air cooling generating set

Info

Publication number: CN201293584Y
Application number: CNU2008201238873U
Authority: CN
Inventors: 高春芳
Original assignee: BEIJING CE BLUESKY ENERGY SAVING TECHNOLOGY Co Ltd
Current assignee: TIANJIN ZHONGNENG BLUE SKY ENERGY SAVING TECHNOLOGY DEVELOPMENT CO., LTD.
Priority date: 2008-11-24
Filing date: 2008-11-24
Publication date: 2009-08-19
Anticipated expiration: 2018-11-24

Abstract

In order to solve the contradiction of economic operation and radiator antifreeze in the existing steam calandria type radiator, the utility model provides a direct air-cooled generator set generator air-cooled island antifreeze type radiator, including a steam joint box, a lower joint box, a plurality of hot pipes, wherein, the hot pipe is mounted between the steam joint box and the lower joint box, heat sinking fins are also provided between two hot pipes, a water conduit is respectively connected at both ends between the steam joint box and the lower joint box. The hot pipe is a tubular structure with sealed both ends, including a tube shell and a tube core, wherein, the tube core is filled with heat exchange medium, Freon. The radiator of the utility model will not frost at a very low temperature, and the steam turbine can operate at a very low pressure, thereby achieve the object of controlling the economic operation of steam turbine under limit favorable back pressure while the frost of the radiator tube rows will not take place.

Description

Direct Air-Cooled generating set air cooling island anti-freeze type radiator

Technical field

The utility model relates to a kind of heat abstractor, especially a kind of radiator that is used for Direct Air-Cooled generating set air cooling island.

Background technology

Area at the rich coal of northern China lack of water, there has been a large amount of Direct Air-Cooled generating sets to go into operation, steam calandria radiator is adopted on the air cooling island usually, its operation principle is, exhaust steam (generally being moist steam) by the steam turbine discharge, enter the steam header of radiator top, and then enter into each comb of radiator.The fin that links together with the steam comb can amplify area of dissipation doubly a lot, when cold air passes between comb and fin, the heat of steam in the comb is taken away, gradually the steam in the comb is condensed into water, thereby finished the cooling of steam turbine being discharged exhaust steam.

But because steam calandria radiator, when summer, atmospheric temperature height, air movement viscosity increase, and atmospheric density reduces, and cause the MAF that flows through radiator to descend, and the coefficient of heat transfer descends, thereby reduces cooling effect.Even this moment, cooling blower reached maximum speed, to the minimum requirements of steam discharge absolute pressure (hereinafter to be referred as back pressure), this will not reduce back pressure by the operate power of restriction steam turbine, so economy is very poor when still reaching steam turbine operation yet.

In the time of in the winter time, because northern area temperature is very low, most of regional minimum temperatures will drop to subzero below 20 ℃, in the process of steam heat release, condensation, the steam comb has the possibility of bursting by freezing, so steam calandria radiator operation will have antifreezing measures, like this winter steam turbine the operation back pressure generally still maintain more than the 10kPa, to reach the vapor (steam) temperature that improves in the radiator, prevent the purpose of radiator comb bursting by freezing.The meteorological condition in winter can make steam turbine hang down back pressure operation originally, brought into play its operational efficiency to greatest extent, but because antifreeze requirement, steam turbine still moves under high relatively back pressure, causes very big energy waste.

The utility model content

In order to solve existing steam calandria radiator economical operation and the antifreeze contradiction of radiator, the utility model provides a kind of Direct Air-Cooled generating set air cooling island anti-freeze type radiator, i.e. heat-pipe type radiator.

The technical solution of the utility model is a kind of Direct Air-Cooled generating set air cooling island anti-freeze type radiator, comprise steam header, lower collecting box, also comprise some heat pipes, heat pipe is installed between steam header and the lower collecting box, between per two heat pipes radiating fin is installed also, respectively connects an aqueduct between steam header and the lower collecting box respectively at two ends.

Described heat pipe is the airtight tubular structures in two ends, comprises shell and tube core, is filled with heat transferring medium in the tube core, and described heat transferring medium is a freon.

The beneficial effects of the utility model are, radiator bursting by freezing can not take place under very low temperature, and steam turbine can move under very low back pressure, thereby reach the purpose of control steam turbine economical operation under the favourable back pressure of the limit.

Description of drawings

Fig. 1 is existing steam calandria radiator schematic diagram;

Fig. 2 is the utility model heat-pipe type radiator schematic diagram;

Fig. 3 is the heat pipe structure schematic diagram.

The specific embodiment

A kind of heat pipe-type Direct Air-Cooled generating set air cooling island anti-freeze type radiator as shown in Figure 2, comprise steam header 1, lower collecting box 2, also comprise some heat pipes 4, heat pipe 4 is installed between steam header 1 and the lower collecting box 2, between per two heat pipes 4 radiating fin 5 is installed also, steam header 1 is one, and lower collecting box 2 is two, respectively connects an aqueduct 6 between steam header 1 and the lower collecting box 2 respectively at two ends.Described heat pipe 4 is the airtight tubular structures in two ends, comprises shell 7 and tube core 8, and working chamber 9, is filled with heat transferring medium 10 in the tube core 8, and heat transferring medium 10 is a freon.Steam header 1 is connected with the steam comb of air cooled generator group steam turbine, and downcomer is equipped with in lower collecting box 2 bottoms, and this downcomer is connected with header tank.

As shown in Figure 3, because the freon in the heat pipe is inner medium to be undergone phase transition and transmits heat, absorb heat when promptly liquid state is changeed gaseous state, heat release when gaseous state changes liquid, therefore the thermal conduction characteristic of heat pipe is very good, in case very little heat transfer temperature difference is arranged, just can pass to the other end to heat from an end, and the heat transfer uniformity is very good, and the temperature of whole heat pipe body is consistent.When heat pipe was connected with steam header, the steam in the steam header was that heat release thermal source, heat pipe are heat carriers, belonged to the heat conduction that does not have the temperature difference between thermal source and the heat carrier, so the temperature of heat pipe equals the interior vapor (steam) temperature of steam header at this moment.Because the interior vapor (steam) temperature of the surface temperature of heat pipe body and header is consistent, so heat-pipe type radiator is compared with steam calandria radiator, under the identical boundary condition of steam parameter, air themperature, wind direction, the thermal discharge of unit are equates.

In addition because the freezing point temperature of freon is-107 ℃ (subzero 107 degree), split so rise even the temperature of severe cold can not take place freezing yet.

As shown in Figure 2, during work, the moist steam that steam turbine is discharged enters steam header.This moment, the condensation exothermic process of steam was: by the steam in the steam header of top heat is passed to heat pipe, simultaneously heat pipe again with cooling air generation heat exchange, heat is passed to air, finish the heat release condensation of steam.The water that steam condenses into all concentrates on upper header, flows into lower collecting box by the aqueduct between steam header and the lower collecting box, enters into header tank by downcomer again.

Heat-pipe type radiator is compared with steam comb radiator like this, and the season heat exchange effect higher in temperature is identical, just can play in the winter time and not only reduce back pressure, economical operation but also prevent freezing purpose.Expectation can make back pressure be low to moderate 7kPa, can make thermal loss of steam turbine descend 1% like this, make electric coal consumption (3.5 grams/kwh) that descend 1%, the general winter operation time is about 2500 hours, generating set for a 600MW, by its average load rate 75%, generating electricity in winter 1,100,000,000 kwh, can save more than 3600 ton of standard coal every year.

It should be noted that should be installed in the cardinal wind in winter to heat-pipe type radiator, be prone to freezing position, is the part that cold air directly washes away because bursting by freezing appears in radiator, is not that the air cooling island is whole.As long as prevent local freezing safety, the economical operation that just can realize whole air cooling island, do not advocate whole air cooling island and all use heat-pipe type radiator.

Claims

1, a kind of Direct Air-Cooled generating set air cooling island anti-freeze type radiator, comprise steam header, lower collecting box, it is characterized in that, also comprise some heat pipes, heat pipe is installed between steam header and the lower collecting box, between per two heat pipes radiating fin is installed also, respectively connects an aqueduct between steam header and the lower collecting box respectively at two ends.

2, Direct Air-Cooled generating set air cooling as claimed in claim 1 island anti-freeze type radiator is characterized in that described heat pipe is the airtight tubular structures in two ends, comprises shell and tube core, is filled with heat transferring medium in the tube core.

3, Direct Air-Cooled generating set air cooling as claimed in claim 2 island anti-freeze type radiator is characterized in that described heat transferring medium is a freon.

4, as arbitrary described Direct Air-Cooled generating set air cooling island anti-freeze type radiator among the claim 1-3, it is characterized in that described steam header is one, lower collecting box is two; Steam header is connected with the steam comb of air cooled generator group steam turbine; Downcomer is equipped with in the lower collecting box bottom, and this downcomer is connected with header tank.