CN102914180A - Indirect air cooling system and antifreezing and pre-warming method thereof - Google Patents
Indirect air cooling system and antifreezing and pre-warming method thereof Download PDFInfo
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- CN102914180A CN102914180A CN2012104345558A CN201210434555A CN102914180A CN 102914180 A CN102914180 A CN 102914180A CN 2012104345558 A CN2012104345558 A CN 2012104345558A CN 201210434555 A CN201210434555 A CN 201210434555A CN 102914180 A CN102914180 A CN 102914180A
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Abstract
The invention discloses an indirect air cooling system and an antifreezing and pre-warming method thereof. The indirect air cooling system comprises an auxiliary boiler (1) and air cooling towers (2), wherein the air cooling towers comprise radiators (3) arranged surrounding the air cooling towers, the auxiliary boiler is internally provided with an air preheater, and warm-air pipes are connected between the air preheater and the radiators. When the indirect air cooling system is provided with the plurality of air cooling towers comprising a working tower in working state, and a start tower to be started, blowers (8) can be respectively arranged in each air cooling tower, the working tower and the start tower are enabled to be connected mutually by the warm-air pipes, the blower arranged in the working tower absorbd hot air in the working tower, the hot air is transferred to the blower in the start tower by the warm-air pipes, and the hot air is transferred to the radiators of the start tower through the blowers of the start tower so as to heat the radiators.
Description
Technical field
The present invention relates to the indirect air cooling technical field, particularly, relate to a kind of indirect air cooling system and be used for antifreeze pre-heating method on the indirect air cooling unit.
Background technology
(for example in China's Condition in North Xinjiang) is difficult to adapt to the requirement of water saving and sustainable development to traditional clammy thermal power generation unit in the water-deficient area, simultaneously also there are the characteristics such as cold in winter and hot in summer, that spring and autumn is windy in Condition in North Xinjiang, and surface-type indirect air cooling unit is with its water saving, energy-conservation, wind resistance and the first-selection that the advantages such as the vacuum system impact is little become this area's power plant construction.But when environment temperature is low, recirculated water in the heat radiator fin pipe of indirect air cooling system easily produces and freezes to cause the finned tube spalling, thereby the freezing accident that causes indirect air cooling unit frequent occurrence radiator, water circulation interruption, a cooling system and unit outage when serious, the freezing recovery technique difficulty of radiator is high, workload large, the time is also long, so the loss that causes is huge.In addition, the installation places such as each adpting flange and sealing ring may be revealed because the reasons such as strain and mechanical damage produce in air cooling tower, so that a large amount of recirculated cooling waters flow to outside the shutter outward, the shutter of indirect air cooling unit periphery leaks and can freeze together with radiator soon owing to this inside, so that have ice-melt problem after freezing, otherwise air cooling tower can not start work.Therefore use indirect air cooling system must at first solve a cooling system radiator preventing freeze in winter problem at extremely frigid zones.
Summary of the invention
The object of the present invention is to provide a kind of indirect air cooling system and antifreeze pre-heating method thereof, can prevent effectively that the indirect air cooling unit from starting freezing of fin finned tube bursting by freezing that the water filling stage may cause and shutter.
For achieving the above object, according to an aspect of the present invention, a kind of indirect air cooling system is provided, this indirect air cooling system comprises air cooling tower, described air cooling tower is included in peripheral part of this air cooling tower around the radiator of arranging, wherein, this indirect air cooling system also comprises the startup boiler, be provided with air preheater in this startup boiler, be connected with hot air duct between this air preheater and the described radiator.
Preferably, described air cooling tower is divided into a plurality of sectors described radiator around direction, described hot air duct comprises female pipeline and a plurality of sub-pipes, described female pipeline connects an end of described air preheater and described a plurality of sub-pipes, and the other end of described a plurality of sub-pipes is connected respectively in the described radiator in each described sector.
Preferably, be provided with the sector valve on the described sub-pipes.
Preferably, described radiator comprises a plurality of cooling sections that are the triangular prism shape, this cooling section comprises upper plate, lower shoe and the shutter between this upper plate and lower shoe and Duo Gen heat radiator fin pipe, described shutter is installed on the prismatic surface outside described air cooling tower, described many heat radiator fin pipes are spaced on two other prismatic surface in described air cooling tower of described cooling section vertically, described lower shoe is provided with hot-wind inlet, and this hot-wind inlet links to each other with the sub-pipes of described hot air duct.
Preferably, this indirect air cooling system also comprises the blower fan on the female pipeline that is connected to described hot air duct.
Preferably, described blower fan is arranged in the described air cooling tower.
Preferably, this antifreeze pre-warming system also comprises by first node and Section Point and is connected to parallel pipeline on described female pipeline, described assembling is to described parallel pipeline, the outlet air end of this blower fan links to each other with described first node and air intake links to each other with described Section Point, wherein, on described female pipeline, be provided with the first blower fan valve between described first node and the described sub-pipes, be provided with the second blower fan valve between described first node and the Section Point, parallel pipeline between the air intake of described Section Point and described blower fan is provided with the 3rd blower fan valve, also be connected with intake stack on the air intake of described blower fan, this intake stack is provided with the four fan device valve.
Preferably, above-mentioned air cooling tower comprises the first air cooling tower and the second air cooling tower, described hot air duct comprises first female pipeline, second female pipeline and the 3rd female pipeline, link to each other with second female pipeline by described first female pipeline between described the first air cooling tower and the second air cooling tower, the air preheater of described startup boiler connects respectively described first female pipeline and second female pipeline by the described the 3rd female pipeline.
Preferably, be provided with accordingly respectively the first opening/shutting valve, the second opening/shutting valve and the 3rd opening/shutting valve on described first female pipeline, second female pipeline and the 3rd female pipeline.
According to another aspect of the present invention, a kind of antifreeze pre-heating method of indirect air cooling system is provided, the air preheater that arranges on the startup boiler of the method with indirect air cooling system is connected to by hot air duct on the radiator in the air cooling tower of described indirect air cooling system, to utilize hot blast that described air preheater produces to described radiators heat.
According to also aspect of the present invention, the antifreeze pre-heating method of another kind of indirect air cooling system is provided, this indirect air cooling system has a plurality of air cooling towers, comprise in running order respectively work tower in these a plurality of air cooling towers and be in the startup tower for the treatment of starting state, the method comprises: in each described air cooling tower blower fan is set respectively, and described work tower and described startup tower be connected with each other by hot air duct, wherein, assembling in the described work tower for to absorb hot blast in this work tower, is sent to this hot blast on the blower fan in the described startup tower by described hot air duct and the described blower fan by this startup tower is sent on the radiator of described startup tower with to this radiators heat.
Pass through technique scheme, in indirect air cooling system according to the present invention and antifreeze pre-heating method thereof, can be handed on the radiator of air cooling tower by the air preheater after heat hearsay that hot air duct will start boiler, freeze or shutter freezes in the water-filling stage with the heat radiator fin pipe that prevents air cooling tower, perhaps, have in running order and treat in the indirect air cooling unit of a plurality of air cooling towers of starting state respectively, can introduce hot blast in the in running order air cooling tower in the air cooling tower for the treatment of starting state by blower fan is set, and by blower fan hot blast is sent on the finned tube and shutter of radiator.Whole system is energy-conservation, easy to operate, so that the indirect air cooling unit can safely and reliably operation in psychro-environment.
Other features and advantages of the present invention will partly be described in detail in the specific embodiment subsequently.
Description of drawings
Accompanying drawing is to be used to provide a further understanding of the present invention, and consists of the part of specification, is used from explanation the present invention with the following specific embodiment one, but is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the fundamental diagram of indirect air cooling system;
Fig. 2 is the structural representation that the pipeline of the indirect air cooling system of a preferred embodiment of the invention connects;
Fig. 3 is the structural representation of the cooling section of the radiator in the air cooling tower shown in Fig. 1.
Description of reference numerals
1 starts boiler 2 air cooling towers
3 radiators, 4 sub-pipes
5 sector valves, 6 cooling sections
7 hot-wind inlets, 8 blower fans
9 parallel pipelines, 10 intake stacks
11 first female pipeline 12 second female pipelines
13 the 3rd female pipeline 14 first opening/shutting valves
15 second opening/shutting valves 16 the 3rd opening/shutting valve
21 first air cooling towers, 22 second air cooling towers
61 upper plates, 62 lower shoes
63 shutters, 64 heat radiator fin pipes
J1 first node J2 Section Point
A the first blower fan valve B the second blower fan valve
C the 3rd blower fan valve D four fan device valve
The specific embodiment
Below, describe in detail according to the embodiment of the present invention with reference to the accompanying drawings.Should be understood that, the specific embodiment described herein only is used for description and interpretation the present invention, is not limited to the present invention.
In the present invention, in the situation that do opposite explanation, the noun of locality of use as " upper and lower " normally for direction shown in the drawings or for vertically, each parts mutual alignment relationship description word on the vertical or gravity direction.
Be illustrated in figure 1 as the fundamental diagram of indirect air cooling system.Wherein, the steam that produces from the steam boiler (not shown) forms the condensate water discharge after surperficial gas trap carries out heat exchange, the indirect air cooling unit carries out circulating cooling by recirculated cooling water effects on surface condenser, the high temperature circulation cooling water that produces is delivered on the air cooling tower 2 of indirect air cooling unit under the pressure of water circulating pump transmits, air cooling tower 2 is usually circular around forming all around by radiator 3, the peripheral part of radiator 3 arranges shutter, when shutter is opened, cool ambient air enters in the round cavity of air cooling tower 2, cold air produces heat exchange through radiator 3 time, the hot-air that forms is discharged from the mediad of air cooling tower 2, is back to surperficial condenser after the high temperature circulation water quench simultaneously and again carries out circulating cooling.Wherein, when the freezing accident of radiator occurs, two conditions are arranged usually: the one, environment temperature is lower than 0 ℃; The 2nd, the velocity of medium in the heat radiator fin pipe is less or stop to flow.Therefore the heat radiator fin pipe easily freezed when the time was carried out the radiator water-filling of indirect air cooling system and drain operation in the winter time, be exactly since in this process in the radiator water flow velocity little and outside air temperature is low.Especially water filling process, radiator temperature is low, and environment temperature is low, and water filling process is not finished namely and is freezed.In addition, if radiator is freezing or leak when causing freezing the outer shutter of radiator, then shutter is difficult to open, and air cooling tower is difficult to startup work.
Therefore, as shown in Figure 2, the invention provides a kind of indirect air cooling system, this indirect air cooling system comprises air cooling tower 2, and air cooling tower 2 is included in peripheral part of this air cooling tower 2 around the radiator 3 of arranging.In addition, this indirect air cooling system also comprises for the startup boiler 1 that starts steam boiler, can be provided with the air preheater (not shown) in this startup boiler 1, be connected with hot air duct between this air preheater and the radiator 3, providing hot blast by the air preheater that starts boiler 1 to air cooling tower 2, freeze or provide hot blast to be used for shutter is thawed in the water-filling stage to prevent the heat radiator fin pipe in the air cooling tower 2.
Wherein, air cooling tower 2 radiator 3 around direction on generally can be divided into a plurality of sectors, therefore hot air duct can comprise female pipeline and a plurality of sub-pipes 4, female pipeline connects an end of air preheater and a plurality of sub-pipes 4, and the other end of a plurality of sub-pipes 4 is connected respectively in the radiator 3 in each sector.Preferably, can be provided with sector valve 5 on each sub-pipes 4.Like this, can heat a plurality of sectors simultaneously, but optionally by opening and closing sector valve 5 single or some of sectors be passed into hot blast, and in passing into the sector of Hot-blast Heating, inject cooling water, thereby start the indirect air cooling unit., just can stop passing into hot blast in the air cooling tower 2 fully after the startup work until air cooling tower 2.
Particularly, when the sub-pipes 4 by hot air duct passes into hot blast to radiator 3, radiator 3 in the present embodiment comprises a plurality of cooling sections 6 that are the triangular prism shape, as shown in Figure 3, this cooling section 6 comprises upper plate 61, lower shoe 62 and the shutter 63 between this upper plate 61 and lower shoe 62 and Duo Gen heat radiator fin pipe 64, shutter 63 is installed on the prismatic surface (being the outer peripheral face of air cooling tower 2) outside air cooling tower, many heat radiator fin pipes 64 are spaced on two other prismatic surface in air cooling tower of cooling section 6 vertically, lower shoe 62 is provided with hot-wind inlet 7, and this hot-wind inlet 7 links to each other with the sub-pipes 4 of hot air duct.When passing into hot blast, first shutter 63 is closed, so that the hot blast that passes into carries out preheating to heat radiator fin pipe 64 cooling section 6 is interior.When the minimum temperature of heat radiator fin pipe 64 reaches 5 ℃ of left and right sides, can and keep rational waterflood injection rate to radiator 3 interior water fillings, freeze in case under severe cold condition, produce.But sector of sector water filling of a plurality of sectors pre-warm of air cooling tower 2 is until the equal water-filling in each sector is complete.
In order to play pressurization and to finish quickly preheating to radiator 3 with larger flow starting hot blast that boiler 1 sends here, indirect air cooling system in the present embodiment also can comprise the blower fan 8 on the female pipeline that is connected to hot air duct, and blower fan 8 preferably is arranged in the air cooling tower 2.Blower fan 8 also can be used as the hot blast that aspirates this air cooling tower 2 in and to another air cooling tower 2 interior transmission hot blasts that are about to startup, below will address when an air cooling tower 2 operation.As shown in Figure 2, when blower fan 8 is installed, also can comprise by first node J1 and Section Point J2 according to antifreeze pre-warming system of the present invention and to be connected to parallel pipeline 9 on female pipeline, blower fan 8 can be installed on the parallel pipeline 9, the outlet air end of this blower fan 8 links to each other with first node J1 and air intake links to each other with Section Point J2, wherein, on female pipeline, be provided with the first blower fan valve A between first node J1 and the sub-pipes 4, be provided with the second blower fan valve B between first node J1 and the Section Point J2, parallel pipeline 9 between the air intake of Section Point J2 and blower fan 8 is provided with the 3rd blower fan valve C, also be connected with intake stack 10 on the air intake of blower fan 8, this intake stack 10 is provided with four fan device valve D.Blower fan 8 successively mode is installed, can be so that blower fan 8 opens the effect of exhausting or air-supply easily.
Particularly, as shown in Figure 2, when air cooling tower comprises the first air cooling tower 21 and the second air cooling tower 22, hot air duct can comprise first female pipeline 11, second female pipeline 12 and the 3rd female pipeline 13, link to each other with second female pipeline 12 by first female pipeline 11 between the first air cooling tower 21 and the second air cooling tower 22, the air preheater that starts boiler 1 connects respectively first female pipeline 11 and second female pipeline 12 by the 3rd female pipeline 13.Preferably, can be provided with accordingly respectively the first opening/shutting valve 14, the second opening/shutting valve 15 and the 3rd opening/shutting valve 16 on first female pipeline 11, second female pipeline 12 and the 3rd female pipeline 13.In the situation that two units are all stopped transport, then will start boiler 1 and start to drive steam boiler generation steam.At this moment, the hot blast of the air preheater of the desirable self-starting boiler 1 of hot blast.When a unit operation is arranged, i.e. air cooling tower 2 work, in the time of can producing hot blast, hot blast can be from the air cooling tower 2 interior extractions of operation.Therefore, the antifreeze pre-heating method of a kind of indirect air cooling system provided by the invention is: the air preheater that arranges on the startup boiler 1 of indirect air cooling system is connected to by hot air duct on the radiator 3 in the air cooling tower 2 of indirect air cooling system, to utilize hot blast that air preheater produces to radiator 3 heating.
In addition, the antifreeze pre-heating method of a kind of indirect air cooling system that also provides is: this indirect air cooling system has when comprising in running order respectively work tower in a plurality of air cooling towers 2 and this a plurality of air cooling towers 2 and being in the startup tower for the treatment of starting state, at each air cooling tower 2 interior blower fans 8 that arrange respectively, and with work tower with start tower and be connected with each other by hot air duct, wherein, blower fan 8 in the work tower is installed as in this work tower absorbs hot blast, this hot blast is sent to by hot air duct on the blower fan 8 that starts in the tower and the blower fan 8 by this startups tower is sent on the radiator 3 that starts tower so that this radiator 3 is heated.The method has been saved the energy that starts boiler 1, has effectively utilized the hot blast that the air cooling tower 2 under the duty is discharged.
Below take the indirect air cooling system that comprises two air cooling towers shown in Figure 2 as example, set forth the antifreeze pre-heating method of this indirect air cooling system.Wherein, when injecting hot gas for by startup boiler 1 the first air cooling tower 21, start boiler 1 in running order, can close the second opening/shutting valve 15, open the first opening/shutting valve 14 and the first opening/shutting valve 16, and the sector valve 5 of opening the first air cooling tower 21 interior required pre-warm sectors, and with the second blower fan valve B with four fan device valve D closes and the first blower fan valve A and the 3rd blower fan valve C are opened, start blower fan 8, thereby the hot blast that the air preheater that starts boiler 1 is sent here carries out supercharging and air-supply.At this moment, when air cooling tower 2 to be started or shutter 63 freezed, shutter 63 all need be in closed condition, to prevent that hot blast is to shutter 63 outer losses.Then foregoing hot blast in turn or is fully injected in each sectors in the air cooling tower 2, to add heat radiator 3 or heating shutter 63 thaws.
When the second air cooling tower 22 normally moves, and the first air cooling tower 21 is waited to start when maybe needing to thaw, and then can utilize the hot gas in the second air cooling tower 22 to inject in the first air cooling tower 21.At this moment, start boiler 1 in running order, can close the 3rd opening/shutting valve 16 and open the first opening/shutting valve 14 and the second opening/shutting valve 15, make it possible between the first air cooling tower 21 and the second air cooling tower 22, form hot-air channel.It should be noted that each valve in the first air cooling tower 21 is still opened as described above or closure this moment, but the blower fan 8 in the second air cooling tower 22 need to be installed as and can extract hot blast from the central portion of the second air cooling tower 22.Therefore in the second air cooling tower 22, with the second blower fan valve B with four fan device valve D opens and the 3rd blower fan valve C and the first blower fan valve A are closed (perhaps close the 3rd blower fan valve C and all sector valves 5), start blower fan 8, so that the air intake of the blower fan 8 in the second air cooling tower 22 can extract hot blast from the central portion of the second air cooling tower 22 by intake stack 10, this hot blast enters in the first air cooling tower 21 through second female pipeline 12 and first female pipeline 11 successively.Below only the indirect air cooling system that comprises two indirect air cooling units and the implementation process of antifreeze pre-heating method thereof have been set forth with way of example.For the indirect air cooling system that comprises more indirect air cooling units, can process with reference to aforesaid way fully, thereby also be encompassed in protection scope of the present invention with it will be appreciated by those skilled in the art that.
Below describe by reference to the accompanying drawings preferred embodiment of the present invention in detail; but; the present invention is not limited to the detail in the above-mentioned embodiment; in technical conceive scope of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
Need to prove in addition, each concrete technical characterictic described in the above-mentioned specific embodiment in reconcilable situation, can make up by any suitable mode, for fear of unnecessary repetition, the present invention is to the no longer separately explanation of various possible combinations.
In addition, also can carry out any combination between the various embodiment of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (11)
1. indirect air cooling system, this indirect air cooling system comprises air cooling tower (2), described air cooling tower (2) is included in peripheral part of this air cooling tower around the radiator (3) of arranging, it is characterized in that, this indirect air cooling system also comprises startup boiler (1), be provided with air preheater in this startup boiler (1), be connected with hot air duct between this air preheater and the described radiator (3).
2. indirect air cooling system according to claim 1, it is characterized in that, described air cooling tower (2) is divided into a plurality of sectors described radiator (3) around direction, described hot air duct comprises female pipeline and a plurality of sub-pipes (4), described female pipeline connects an end of described air preheater and described a plurality of sub-pipes (4), and the other end of described a plurality of sub-pipes (4) is connected respectively in the described radiator (3) in each described sector.
3. indirect air cooling system according to claim 2 is characterized in that, is provided with sector valve (5) on the described sub-pipes (4).
4. indirect air cooling system according to claim 2, it is characterized in that, described radiator (3) comprises a plurality of cooling sections (6) that are the triangular prism shape, this cooling section (6) comprises upper plate (61), lower shoe (62) and be positioned at this upper plate (61) and lower shoe (62) between shutter (63) and many heat radiator fin pipes (64), described shutter (63) is installed on the prismatic surface outside described air cooling tower, described many heat radiator fin pipes (64) are spaced on two other prismatic surface in described air cooling tower of described cooling section (6) vertically, described lower shoe (62) is provided with hot-wind inlet (7), and this hot-wind inlet (7) links to each other with the sub-pipes (4) of described hot air duct.
5. indirect air cooling system according to claim 2 is characterized in that, this indirect air cooling system also comprises the blower fan (8) on the female pipeline that is connected to described hot air duct.
6. indirect air cooling system according to claim 5 is characterized in that, described blower fan (8) is arranged in the described air cooling tower (2).
7. indirect air cooling system according to claim 5, it is characterized in that, this antifreeze pre-warming system also comprises by first node (J1) and Section Point (J2) and is connected to parallel pipeline (9) on described female pipeline, described blower fan (8) is installed on the described parallel pipeline (9), the outlet air end of this blower fan (8) links to each other with described first node (J1) and air intake links to each other with described Section Point (J2), wherein, on described female pipeline, be provided with the first blower fan valve (A) between described first node (J1) and the described sub-pipes (4), be provided with the second blower fan valve (B) between described first node (J1) and the Section Point (J2), parallel pipeline (9) between the air intake of described Section Point (J2) and described blower fan (8) is provided with the 3rd blower fan valve (C), also be connected with intake stack (10) on the air intake of described blower fan (8), this intake stack (10) is provided with four fan device valve (D).
8. according to the described indirect air cooling system of any one in the claims 1 to 7, it is characterized in that, described air cooling tower comprises the first air cooling tower (21) and the second air cooling tower (22), described hot air duct comprises first female pipeline (11), second female pipeline (12) and the 3rd female pipeline (13), link to each other with second female pipeline (12) by described first female pipeline (11) between described the first air cooling tower (21) and the second air cooling tower (22), the air preheater of described startup boiler (1) connects respectively described first female pipeline (11) and second female pipeline (12) by the described the 3rd female pipeline (13).
9. indirect air cooling system according to claim 8, it is characterized in that, be provided with accordingly respectively the first opening/shutting valve (14), the second opening/shutting valve (15) and the 3rd opening/shutting valve (16) on described first female pipeline (11), second female pipeline (12) and the 3rd female pipeline (13).
10. the antifreeze pre-heating method of indirect air cooling system, it is characterized in that, the method is connected to the upper air preheater that arranges of the startup boiler (1) of indirect air cooling system on the radiator (3) in the air cooling tower (2) of described indirect air cooling system by hot air duct, with the hot blast that utilizes described air preheater to produce described radiator (3) is heated.
11. the antifreeze pre-heating method of indirect air cooling system, this indirect air cooling system has a plurality of air cooling towers (2), comprise in running order respectively work tower in these a plurality of air cooling towers (2) and be in the startup tower for the treatment of starting state, it is characterized in that, the method comprises: in each described air cooling tower (2) blower fan (8) is set respectively, and described work tower and described startup tower be connected with each other by hot air duct, wherein, blower fan in the described work tower (8) is installed as in this work tower absorbs hot blast, this hot blast is sent to the radiator (3) that blower fan (8) in the described startup tower described blower fan (8) upper and by this startup tower is sent to described startup tower by described hot air duct goes up so that this radiator (3) is heated.
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