CN104963728A - Ultrahigh pressure impulse steam turbine - Google Patents
Ultrahigh pressure impulse steam turbine Download PDFInfo
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- CN104963728A CN104963728A CN201510357413.XA CN201510357413A CN104963728A CN 104963728 A CN104963728 A CN 104963728A CN 201510357413 A CN201510357413 A CN 201510357413A CN 104963728 A CN104963728 A CN 104963728A
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Abstract
The invention relates to an ultrahigh pressure impulse steam turbine. The ultrahigh pressure impulse steam turbine comprises a single steam cylinder, a single rotor and multiple blade stages. The single steam cylinder is provided with a high pressure cylinder body and a middle-low pressure cylinder body. The single rotor is installed in the steam cylinder and stretches through the high pressure cylinder body and the middle-low pressure cylinder. Each blade stage comprises multiple stationary blades arranged on the inner wall of the steam cylinder and multiple moving blades arranged on the rotor. The steam cylinder comprises a high pressure cylinder steam inlet and a high pressure cylinder steam outlet which are located on the high pressure cylinder body, a high pressure intermediate-discharge extraction opening located on the high pressure cylinder body and a middle-low pressure cylinder steam inlet located on the middle-low pressure cylinder body. The high pressure cylinder steam inlet is directly communicated with the middle-low cylinder steam inlet through a connecting pipe. The ultrahigh pressure impulse steam turbine has the advantage that a large amount of industrial steam can be provided while electric power is generated.
Description
Technical field
The present invention relates to steam turbine field, more particularly, the present invention relates to a kind of superhigh pressure impact steam turbine, especially a kind of ultrahigh pressure black soy sauce vapour impulsion condensing steam turbine.
Background technique
Steam turbine is one of thermal power industry main production equipments.The complicated energy conversion machinery of steam turbine to be one with water vapor be medium, playing the thermal energy of steam is mechanical energy, and changes mechanical energy is the effect of electric energy by final drive electrical generators.After the high-temperature high-pressure overheat steam that boiler produces enters steam turbine, the conversion of heat energy and kinetic energy is produced between every one-level rotor and stator blade of steam turbine, by expansion working step by step, swiftly flowing Steam Actuation rotor high-speed rotates, drive electrical generators long-term work, converts mechanical energy to huge electric energy.
Steam turbine can be divided into impulse steam turbine and reaction turbine according to the performance characteristic of vapor stream between turbine moving-stator blade.Vapor stream in impulse steam turbine only changes direction between movable vane, and mainly expand between stator blade and accelerate, the level reaction degree of turbine is little.The steam turbine great majority that Current Domestic design is produced are impulse steam turbine.
The steam turbine of 100MW ~ 200MW power level, adopts superhigh pressure impact structure usually.The admission initial conditions optimum valuing range of superhigh pressure impact steam turbine is: pressure 12.7Mpa ~ 13.7Mpa, temperature 530 DEG C ~ 560 DEG C.
In the superhigh pressure impact steam turbine design of existing 100MW ~ 200MW power level, generally adopt twin-tub, double rotor, many steam exhaust structures, this is main because this power level steam turbine admission initial conditions is ultrahigh pressure decision.For superhigh pressure turbine, to reach the output power of 100MW ~ 200MW, corresponding steam flow must be had to mate with outlet back pressure.Steam turbine carries out relevant heating power, steam-operating, through-flow, structural design according to admission steam discharge parameter.Consider turbine materials intensity, manufacturing process, steam-operating performance, domestic and international steam turbine producer generally all adopts double rotor, twin-tub, many steam exhaust structures to this power level steam turbine simultaneously, mainly twin-tub, double flow structure.Existing steam turbine in steam turbine working pressure class, can be divided into multiple independently cylinder, such as high-pressure cylinder, intermediate pressure cylinder and low pressure (LP) cylinder according to steam.Be provided with independently rotor or a joint rotor in each cylinder, linked together by coupling between multiple rotor.Steam discharge after steam work done is discharged from multiple low pressure steam-expelling ports of turbine low pressure cylinder.
The shortcomings such as existing ultrahigh pressure steam inlet condition steam turbine exists multi-cylinder, many rotors, many steam discharges feature, its complex structure, and the boundary dimension such as unit total length are large, and weight is large, and manufacture cost is high are with not enough.
Summary of the invention
The object of the present invention is to provide a kind of new superhigh pressure impact steam turbine, it can have simple compact structure, at least one shortcoming that existing steam turbine exists can be overcome with not enough, and there is the non-adjustment of high pressure draw gas and the black soy sauce vapour function of middle pressure adjustable steam extraction.
According to technological scheme of the present invention, a kind of superhigh pressure impact steam turbine, comprising: single cylinder, and it has high pressure cylinder body and mesolow cylinder body; Single rotor, it to be arranged in described cylinder and to extend past described high pressure cylinder body and described mesolow cylinder body; Multiple leaf-level, wherein each leaf-level comprises and is arranged on multiple stator blade on described cylinder inner wall and is arranged on described epitrochanterian multiple moving vane; Wherein, described cylinder comprises and is arranged in high-pressure cylinder steam inlet on described high pressure cylinder body and high-pressure cylinder steam ouput, the high pressure be positioned on described high pressure cylinder body are arranged extraction opening and be positioned at the mesolow cylinder steam inlet on described mesolow cylinder body, and described high-pressure cylinder steam ouput was directly communicated with described mesolow cylinder steam inlet by connecting tube.
Single cylinder single rotor structure can make the length of whole steam turbine greatly shorten, and volume reduces greatly, and structure is simple, compact, intensity and Security increase substantially.Steam is made between high pressure cylinder body and mesolow cylinder body, to be directly communicated with the link can saving resuperheat, further simplified structure.Meanwhile, medium pressure steam can be extracted in a large number out be supplied to downstream industry vapour user by arranging extraction opening in high pressure.Such as, steam turbine 100, when rated power 150MW is constant, presses the middle pressure extraction flow maximum value at extraction opening place can reach the 30%-35% of high-pressure cylinder steam inlet flow in high row.
Preferably, described connecting tube is provided with expansion compensation device.Expansion compensation device can absorb the thermal expansion curve difference between connecting tube and cylinder, prevents connecting tube and cylinder stressed and tensile buckling or damage.
Preferably, described expansion compensation device comprises: body, and its first end was connected with described connecting tube and the second end is closed; The first bellows that contiguous described first end is arranged; The second bellows that contiguous described second end is arranged; And be connected to the described first end of described body and the pull bar of described second end.
Preferably, be provided with described connecting tube for adjusting the flow rate adjusting mechanism arranging the flow of extraction opening in described high-pressure cylinder steam ouput and described high pressure simultaneously.
Preferably, described flow rate adjusting mechanism comprises the butterfly valve arranged near described high pressure cylinder body place, and the opening degree of described butterfly valve can regulate between minimum safe aperture to full open.This can guarantee that the steam flow flowed in mesolow cylinder body has a minimum value ensureing trouble free service.According to the opening degree of this butterfly valve, not only effectively can regulating from high-pressure cylinder steam ouput to the steam of mesolow cylinder steam inlet for driving the leaf-level effect in mesolow cylinder body, also correspondingly can regulate in high row and pressing the extraction steam flow at bleeding point place for industrial user.
Preferably, in described high pressure cylinder body, cylinder body is double-deck cylinder body at least partially, at least the first mezzanine space comprising outer cylinder block, internal layer cylinder body and formed betwixt, the outlet side of described internal layer cylinder body is communicated in described high pressure cylinder body steam ouput and described height row and presses extraction opening by described first mezzanine space.Double-deck cylinder body can reduce the working pressure of outer cylinder block and temperature and improve intensity and the Security of outer cylinder block, and provides in a favourable high-pressure cylinder steam ouput and high row and press extraction opening Install and configure.
Preferably, described high pressure cylinder body is also provided with the high pressure extraction mouth being positioned at described high-pressure cylinder steam ouput upstream, second mezzanine space is also formed between described internal layer cylinder body and described outer cylinder block, described internal layer cylinder body comprises the internal layer cylinder part and high pressure blade ring that are fixed to described outer cylinder block respectively, the narrow annular channel being communicated with described internal layer cylinder interior and described second mezzanine space is limited between described internal layer cylinder part and described high pressure blade ring, described second mezzanine space and described high pressure extraction mouth are interconnected, described first mezzanine space and described second mezzanine space are mutually isolated opening.The demand of downstream industry system high pressure vapour can be met like this, while improving turbine efficiency, utilize multiple independent internal layer cylinder part installed to provide the simple industrial high pressure extraction configuration of structure.
Preferably, described high pressure cylinder body is also provided with the high pressure extraction mouth being positioned at described high-pressure cylinder steam ouput upstream.The demand of downstream industry system high pressure vapour can be met like this, improve turbine efficiency.
Preferably, described high pressure extraction mouth is that flow is nonadjustable.This can maintain the stable operation of steam turbine effectively, ensures the harmony of steam turbine and industrial system.
Preferably, the air inflow of described steam turbine be adjustable and maximum draw gas operating mode time throttle flow reach specified pure condensate operating mode time 1.8-2 doubly.Such as, steam turbine 100 at rated power 150MW and maximum extraction steam for factories amount operating mode time the 1.8-2 of throttle flow when can reach the specified pure condensate operating mode of 150MW doubly, throttle flow is almost equivalent to the throttle flow of a 300MW pure condensate formula steam turbine.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of superhigh pressure impact steam turbine according to an embodiment of the invention;
Fig. 2 is the A place enlarged view according to Fig. 1;
Fig. 3 is the B place enlarged view according to Fig. 1;
Fig. 4 is the C place enlarged view according to Fig. 1;
Fig. 5 is the schematic diagram of superhigh pressure impact steam turbine rotor according to an embodiment of the invention;
Fig. 6 is the schematic diagram of final stage moving blade in superhigh pressure impact steam turbine according to an embodiment of the invention;
Fig. 7 is the final stage moving blade root shape enlarged view according to Fig. 6.
Description of reference numerals:
100, steam turbine; 1, cylinder; 21, center line; 2, rotor; 3, leaf-level; 30, stator blade; 32, moving vane; 24, impeller; 4, separatrix; 40, high pressure section; 42, mesolow section; 10, high pressure cylinder body; 11, mesolow cylinder body; 107, high-pressure cylinder steam inlet; 101, high-pressure cylinder steam ouput; 105, high pressure extraction mouth; 103, extraction opening is pressed in high row; 111, mesolow cylinder steam inlet; 12, connecting tube; 108, outer cylinder block; 109, internal layer cylinder body; 1090, internal layer cylinder part; 1091, high pressure blade ring; 102, first mezzanine space; 1092, narrow annular channel; 106, second mezzanine space; 1082, convex ridge is installed; 104, shaft seal; 115, individual layer cylinder body; 117, mesolow dividing plate; 113, low pressure steam-expelling port; 13, expansion compensation device; 121, first paragraph body; 122, second segment body; 130, body; 133, the first bellows; 134, the second bellows; 1301, first end; 1302, the second end; 1320, the first flange; 1323, the second flange; 1321, pull bar; 1322, guide sleeve; 14, butterfly valve; 26, rotor high pressure section; 28, rotor mesolow section; 20, front end; 22, rear end; 15, fore bearing; 16, rear bearing; 34, perforate; 320, blade root; 322, Ye Ding; 36, shroud
Embodiment
Description, describes the exemplary scheme of superhigh pressure impact steam turbine disclosed in the present invention in detail.Although provide accompanying drawing to be to present some embodiments of the present invention, accompanying drawing need not be drawn by the size of specific embodiments, and some feature can be exaggerated, to remove or office cuts open to illustrate and explain disclosure of the present invention better.The phrase " in the accompanying drawings " occurred in the description or similar term need not with reference to institute's drawings attached or examples.
Term " about " in the present invention or " roughly " will be understood by those of ordinary skill in the art and change according to the context using this term within the specific limits.
As shown in Figure 1, superhigh pressure impact steam turbine 100 of the present invention comprises cylinder-shaped with the cylinder of integral form structure in turning circle, namely single cylinder 1, to be arranged in this single cylinder 1 single rotor 2 and multiple leaf-level 3 that can rotate around center line 21.Wherein each leaf-level 3 comprises multiple stator blade 30 and multiple moving vane 32, and described stator blade 30 is arranged on the inwall of cylinder 1, and described moving vane 32 is arranged on the impeller 24 of integral form structure with on rotor 2.
As shown in Figure 1, for the superhigh pressure impact steam turbine 100 of 100MW ~ 200MW output power grade, after the high temperature and high pressure steam meeting steam inlet condition enters steam turbine 100, flow through between each leaf-level 3, drive rotor 2 work done of steam turbine 100.Along with steam work done in steam turbine 100, along the travel path of steam in steam turbine 100, the pressure of steam is also reducing gradually.Therefore, in the present invention, according to the size of steam in steam turbine 100 internal pressure, with separatrix 4 for boundary, the high pressure section 40 being roughly divided into by described steam turbine 100 left and right to arrange and mesolow section 42.
The setting of rotor 2 of the present invention and each leaf-level 3 can see more clearly in Figure 5.As shown in Figure 5, rotor 2 of the present invention is single rotor, i.e. an integral rotor.This rotor 2 to be arranged in cylinder 1 and to extend transversely through high pressure cylinder body 10 and mesolow cylinder body 11.According to the high pressure section 40 of Fig. 1 to steam turbine 100 and the division of mesolow section 42, rotor 2 is also correspondingly divided into the rotor high pressure section 26 and rotor mesolow section 28 arranged left and right by separatrix 4.Should be appreciated that carrying out segmentation according to separatrix 4 is here only carry out segmentation according to the working pressure of steam and following description is better understood, and rotor 2 itself is still the rotor of a monobloc forging.
The front end 20 of rotor 2 and rear end 22 be arranged on rotationally be respectively positioned at cylinder 1 two ends fore bearing 15 and rear bearing 16 on.When practical application, the span between the front end 20 of rotor 2 and rear end 22 is chosen usually between 6000mm ~ 7000mm, and front end 20 and rear end 22 span are 5950mm in a specific embodiment.The rear end 22 of rotor 2 to be connected with generator (not shown) by coupling.
In conjunction with see Fig. 5, rotor 2 is provided with multiple moving vane 32.In the present invention, preferably by impeller 24 monobloc forging on rotor 2, unitary moulding is an integral rotor 2, improves impeller intensity, improves the reliability of rotor, and rotor 2 does not have center hole and equalizing orifice, also improves intensity and the Security of rotor 2.Moving vane 32 is arranged on impeller 24 to complete the assembling of rotor 2 and moving vane 32.Moving vane 32 on rotor high pressure section 26 is arranged in the mode of anti-steam flow, with the end thrust of balancing rotor 2.In Fig. 5, the direction of arrow shown in dotted line is the flow direction of steam in cylinder 1 inside by a-f.
In order to the output power making superhigh pressure impact steam turbine 100 reach 100MW ~ 200MW, rotor high pressure section 26 8-11 level moving vane 32 can be arranged usually, and in the rotor low pressure stage 28 10-15 level moving vane 32 can be arranged.In fact be readily appreciated that, all corresponding one-level of every one-level moving vane 32 is fixed on the stator blade 30 on cylinder 1 inwall, and dynamic and static blade 32 and 30 interlaced arrangement, composition steam turbine numerical simulation 3.That is, the high pressure section 40 of steam turbine 100 has 8-11 leaf-level 3, is high pressure leaf-level.And the mesolow section 42 of steam turbine 100 has 9-15 leaf-level 3, it is mesolow leaf-level.In the embodiment shown in fig. 5, the high pressure section 40 of steam turbine 100 has 9 grade blades, and the mesolow section 42 of steam turbine 100 has 9 grade blades.
Because steam turbine 100 provided by the invention is the steam inlet conditions being applied to ultrahigh pressure, extra high pressure steam is by cooling after multiple leaf-level 3, step-down, expansion working, its volume flow sharply increases, and this just requires that the outlet of the final stage of steam turbine 100 has enough large flow area.As shown in Figure 1 and Figure 5, on rotor 2, the height of the moving vane 32 of mesolow leaf-level increases gradually, highly reaches maximum at the moving vane 32 in final stage outlet port.Usually, the design height of final stage outlet moving vane 32 is chosen between 800mm ~ 1000mm.Be 900mm in a preferred embodiment.
Final stage outlet moving vane 32 sees more clearly in figure 6 and figure 7, and moving vane 32 centre is with one for wearing the perforate 34 of loose lacing wire, and this designs to prevent this movable vane generation flutter from damaging.The blade root 320 of final stage moving blade 32 is fir shape, and concrete shape refers to Fig. 7.The leaf top 322 of moving vane 32 is with the shroud 36 also realizing vibrationproof self-locking for round linking in the running.
Continue with reference to figure 1, the horizontal expansion in the horizontal direction of described single cylinder body 1, and for the object easily illustrated also with high pressure cylinder body 10 and mesolow cylinder body 11 that described separatrix 4 is arranged left and right for boundary is roughly divided into.High pressure cylinder body 10 such as forms an entirety by the vertical Flange joint of built-in bolt with mesolow cylinder body 11.It should be noted that in the present invention, high pressure cylinder body 10 and mesolow cylinder body 11 form a cylinder on the whole, namely described single cylinder 1, and are different from multiple cylinder of the prior art.
As shown in Figure 1, high pressure cylinder body 10 is provided with the high-pressure cylinder steam ouput 101 of the high-pressure cylinder steam inlet 107 being positioned at high pressure cylinder body 10 middle rank and the fluid expulsion side being arranged in high pressure cylinder body 10 with this high-pressure cylinder steam inlet 107 separately, and for pressing extraction opening 103 in the high pressure extraction mouth 105 that meets downstream industry vapour demand and high row.This two places factory steam extraction opening is all arranged on the downstream of high-pressure cylinder steam inlet 107.
Here, " high row in pressure " means from the discharge side of high pressure cylinder body 10, the gas namely exporting discharge; Now, although this steam comes from high pressure cylinder body 10, its pressure because the leaf-level 3 promoted in high pressure cylinder body 10 done work and be down to middle pressure, as further described." high-pressure cylinder steam inlet " means the steam inlet of the inflow side being connected to high pressure cylinder body 10, and these steam do work being used for the leaf-level 3 promoted in high pressure cylinder body 10." high-pressure cylinder steam ouput " means the steam inlet of the discharge side being connected to high pressure cylinder body 10; Usually flow through during " high-pressure cylinder steam ouput " steam generally can be arranged with flowing through height and press the vapor phase of extraction opening same and there is substantially identical pressure." high pressure extraction " means the steam extracted out in high pressure cylinder body 10 " pressing extraction opening in high row " or " high-pressure cylinder steam ouput " upstream.Such as when having 8-11 high pressure leaf-level, from the steam that such as 4-7 level extracts.
Described mesolow cylinder body 11 is provided with mesolow cylinder steam inlet 111, and this mesolow cylinder steam inlet 111 was directly communicated with high-pressure cylinder steam ouput 101 by connecting tube 12.Here the implication " be directly communicated with " refers to do not have resuperheat link between high-pressure cylinder steam ouput 101 and mesolow cylinder steam inlet 111.Many places shaft seal 104 is provided with in high pressure cylinder body 10 with the gap of rotor 2.
In conjunction with see Fig. 2, inner at cylinder 1, the high pressure cylinder body 10 shown in it be double shell cylinder body structure at least partially.Specifically, the multiple mezzanine spaces comprising outer cylinder block 108, internal layer cylinder body 109 in described outer cylinder block 108 inside and formed between outer cylinder block 108 and internal layer cylinder body 109.This internal layer cylinder body 109 comprises one or more internal layer cylinder part 1090 (only illustrating) and is positioned at the high pressure blade ring 1091 of internal layer cylinder body 109 end (i.e. fluid expulsion side), and internal layer cylinder part 1090 and the spaced apart setting of high pressure blade ring 1091 are to form the narrow annular channel 1092 be communicated with internal layer cylinder body 109 inside.Formed between high pressure blade ring 1091 with outer cylinder block 108 be communicated with the outlet side of high pressure blade ring 1091, high-pressure cylinder steam ouput 101 and high arrange in press first mezzanine space 102 of extraction opening 103.What formed between internal layer cylinder part 1090 with outer cylinder block 108 is second mezzanine space 106 be communicated with narrow annular channel 1092 and high pressure extraction mouth 105.Here mutually isolatedly between first mezzanine space 102 and second mezzanine space 106 to open.Wherein, this high pressure blade ring 1091 is connected to outer cylinder block 108 by means of the installation convex ridge 1082 on outer cylinder block 108.Preferably, utilize this installation convex ridge 1082 by this first mezzanine space 102 and second mezzanine space 106 is mutually isolated opens.Multiple stator blade 30 is arranged in internal layer cylinder part 1090 and high pressure blade ring 1091.
In conjunction with see Fig. 3, mesolow cylinder body 11 is single-shell casing body structure.Specifically, the mezzanine space comprising individual layer cylinder body 115, mesolow diaphragm housing ring 117 in described individual layer cylinder body 115 inside and be formed between individual layer cylinder body 115 and mesolow diaphragm housing ring 117.Multiple stator blade 30 is provided with equally in mesolow diaphragm housing ring 117.
Refer again to Fig. 1, after flowing into high pressure cylinder body 10 along arrow a direction from the high-pressure cylinder steam inlet 107 of steam turbine 100 from the high temperature and high pressure steam of boiler (not shown) outflow, rotate at high pressure section 40 expansion working rotor driven 2.Wherein a part of steam presses extraction opening 103 to extract out for factory steam user along arrow b, d direction respectively in high pressure extraction mouth 105 and high row, and the factory steam flow extracted out from this high pressure extraction mouth 105 is uncontrollable, is also called non-adjustment and draws gas.Another part vapor flow is to high-pressure cylinder steam ouput 101 and along arrow c direction outflow high pressure cylinder body 10 (high pressure section 40).As previously mentioned, steam is after high pressure section 40 work done, and its pressure is down to middle pressure usually, such as 2.0Mpa ~ 3.0Mpa.The steam flowed out from high-pressure cylinder steam ouput 101 with after flow into mesolow cylinder body 11 along arrow e direction through mesolow cylinder steam inlet 111 through connecting tube 12.Steam for delivering to acting in mesolow cylinder body 11 during this achieves and directly enter mesolow cylinder body 11 after high pressure cylinder body 10 flows out, and eliminates the step by boiler or other means heating steam again (i.e. resuperheat).Steam continues work done rotor driven 2 in mesolow section 42 and rotates afterwards, finally flow to single steam-expelling port 113 to discharge along arrow f direction, enter the huge condenser (not shown) of below, condensed water of condensation is got back to boiler by drainage pump and is reheated, and completes the heat of water vapor, merit transmission circulation.
In order to prevent, because causing tensile buckling or damage (difference of thermal expansion amount is generally 8-12mm) between connecting tube 12 from cylinder 1 because thermal expansion amount is different, being preferably provided with expansion compensation device 13 on connecting tube 12 in this direct handshaking procedures.
In the embodiment of shown in Fig. 1 and Fig. 4, comprise the first paragraph body 121 be communicated with high-pressure cylinder steam ouput 101 and the second segment body 122 be communicated with mesolow cylinder steam inlet 111 connecting tube 12.This expansion compensation device 13 comprises body 130, first bellows 133, second bellows 134 and pull bar 1321.The first end 1301 of its middle tube body 130 is communicated with the first paragraph body 122 of connecting tube 12 and the second end 1302 extends to the direction away from connecting tube 12 and close, thus body 130 and second segment body 122 formed one end close three-port structure.And the first bellows 133 near the first end 1301 of body 130 is connected between first paragraph body 121 and second segment body 122.The second end 1302 that second bellows 134 closes on body 130 is arranged on the closed end of expansion compensation device 13.
The first end 1301 of body 130 is provided with the first flange 1320 or other mounting structure, second end 1302 of body 130 is provided with the second flange 1323 or other mounting structure, and these two flanges 1320,1323 are connected by symmetrically arranged multiple pull bar 1321.Under the restriction of pull bar 1321, the deformation direction of the first bellows 133 and the second bellows 134 is always contrary, greatly can reduce the stress in bellows tube wall like this.
Preferably, body 130 is provided with the guide sleeve 1322 being connected to pull bar 1321, as shown in Figure 1 and Figure 4, a guide sleeve 1322 is arranged on the side of first flange 1320 dorsad of the first bellows 133.Another guide sleeve 1322 is connected to pull bar 1321, and guides this body 130 in the side of second flange 1323 dorsad of the second bellows 134.
But in a unshowned embodiment, comprise the first paragraph body be communicated with high-pressure cylinder steam ouput 101 and the second segment body be communicated with mesolow cylinder steam inlet 111 connecting tube 12, the bellows be connected between first paragraph body with second segment body.
Preferably, in connecting tube 12 and high row, the steam flow flow through in extraction opening 103 is pressed to be all adjustable, and preferably by same flow rate adjusting mechanism.
In a preferred embodiment, can realize pressing in high-pressure cylinder steam ouput 101 (connecting tube 12) and high row by arranging butterfly valve 14 on connecting tube 12 distribution at any time and the adjustment of the steam flow of extraction opening 103 simultaneously.Preferably, the opening degree of this butterfly valve 14 can regulate between minimum safe aperture to full open." minimum safe aperture " is even if mean when butterfly valve 14 is in minimum opening degree, still can ensure enough steam and enter mesolow cylinder body 11 work done by connecting tube 12 from high pressure cylinder body 10, to guarantee that the steam flow flowed in mesolow cylinder body has a minimum value ensureing trouble free service.The opening degree of butterfly valve 14 can change the vapor pressure at first mezzanine space 102 place of high-pressure cylinder steam ouput 101.When the opening degree of butterfly valve 14 is less, the pressure at first mezzanine space 102 place raises.Under this pressure effect, the steam flow of pressing extraction opening 103 to flow out in being arranged by height increases.And by flowing through the corresponding minimizing of steam flow entering mesolow cylinder body 11 connecting tube 12 after butterfly valve 14, on the contrary, when butterfly valve 14 opening degree is larger, middle pressure extraction steam for factories flow can corresponding minimizing, enters the flow then corresponding increase of mesolow cylinder body 11.The opening degree of butterfly valve 14 can be determined by the demand of downstream industry vapour user, i.e. adjustable steam extraction.The middle pressure extraction steam for factories flow regulating function that Here it is utilizes the throttle effect of butterfly valve 14 to produce.
Preferably, superhigh pressure impact steam turbine 100 of the present invention, the throttle flow of the high-pressure cylinder steam inlet 107 of its cylinder 1 can on a large scale in regulate.In a specific embodiment, steam turbine 100, when rated power 150MW is constant, is changed by the aperture of butterfly valve 14, can realize pressing the middle pressure extraction flow at extraction opening 103 place in high row by less to the maximum amount of drawing gas.Press the amount of drawing gas maximum value can reach the 30%-35% of high-pressure cylinder steam inlet 107 flow in this, add the non-adjustment amount of drawing gas at high pressure extraction mouth 105 place, total amount of drawing gas can reach the 35%-40% of high-pressure cylinder steam inlet 107 flow.That is, in this specific embodiment, steam turbine 100 at rated power 150MW and maximum extraction steam for factories amount operating mode time the 1.8-2 of throttle flow when can reach the specified pure condensate operating mode of 150MW doubly.So large throttle flow is almost equivalent to the throttle flow of a 300MW pure condensate formula steam turbine.Here " pure condensate operating mode " and " specified pure condensate operating mode " has those skilled in the art's implication to understand.Wherein " pure condensate operating mode " means working condition or the working condition of steam turbine when not drawing gas of the steam turbine without function of drawing gas.Visible, steam turbine 100 of the present invention, while sending a large amount of electric power, can also provide to factory steam user that a large amount of high and medium voltage is industrial to draw gas.
Steam turbine 100 provided by the invention can be applied to the various power station steam turbines of high pressure or subcritical steam inlet condition equally, and its working principle and technical characteristics are all identical.
Be to be understood that, although this specification describes according to each embodiment, but not each embodiment only comprises an independently technological scheme, this narrating mode of specification is only for clarity sake, those skilled in the art should by specification integrally, technological scheme in each embodiment also through appropriately combined, can form other mode of execution that it will be appreciated by those skilled in the art that.
The foregoing is only the schematic embodiment of the present invention, and be not used to limit scope of the present invention.Any those skilled in the art, the equivalent variations done under the prerequisite not departing from design of the present invention and principle, amendment and combination, all should belong to the scope of protection of the invention.
Claims (10)
1. a superhigh pressure impact steam turbine (100), comprising:
Single cylinder (1), it has high pressure cylinder body (10) and mesolow cylinder body (11);
Single rotor (2), it to be arranged in described cylinder (1) and to extend past described high pressure cylinder body (10) and described mesolow cylinder body (11);
Multiple leaf-level (3), wherein each leaf-level (3) comprises the multiple stator blades (30) be arranged on described cylinder (1) inwall and the multiple moving vanes (32) be arranged on described rotor (2);
Wherein, described cylinder (1) comprises and is arranged in high-pressure cylinder steam inlet (107) on described high pressure cylinder body (10) and high-pressure cylinder steam ouput (101), the high pressure be positioned on described high pressure cylinder body (10) are arranged extraction opening (103) and be positioned at the mesolow cylinder steam inlet (111) on described mesolow cylinder body (11), and described high-pressure cylinder steam ouput (101) was directly communicated with described mesolow cylinder steam inlet (111) by connecting tube (12).
2. superhigh pressure impact steam turbine according to claim 1 (100), is characterized in that, is provided with expansion compensation device (13) described connecting tube (12).
3. superhigh pressure impact steam turbine according to claim 2 (100), is characterized in that, described expansion compensation device (13) comprising:
Body (130), its first end (1301) was connected with described connecting tube (12) and the second end (1302) is closed;
The first bellows (133) that contiguous described first end (1301) is arranged;
The second bellows (134) that contiguous described second end (1302) is arranged; And
Be connected to the described first end (1301) of described body (130) and the pull bar (1321) of described second end (1302).
4. superhigh pressure impact steam turbine according to claim 1 (100), it is characterized in that, be provided with the flow rate adjusting mechanism for adjusting the flow arranging extraction opening (103) in described high-pressure cylinder steam ouput (101) and described high pressure simultaneously described connecting tube (12).
5. superhigh pressure impact steam turbine according to claim 4 (100), it is characterized in that, described flow rate adjusting mechanism comprises the butterfly valve (14) arranged near described high pressure cylinder body (10) place, and the opening degree of described butterfly valve (14) can regulate between minimum safe aperture to full open.
6. superhigh pressure impact steam turbine according to claim 1 (100), it is characterized in that, in described high pressure cylinder body (10), cylinder body is double-deck cylinder body at least partially, at least the first mezzanine space (102) comprising outer cylinder block (108), internal layer cylinder body (109) and formed betwixt, the outlet side of described internal layer cylinder body (109) is communicated in described high-pressure cylinder steam ouput (101) and described height row and presses extraction opening (103) by described first mezzanine space (102).
7. superhigh pressure impact steam turbine according to claim 6 (100), it is characterized in that, described high pressure cylinder body (10) is also provided with the high pressure extraction mouth (105) being positioned at described high-pressure cylinder steam ouput (101) upstream, second mezzanine space (106) is also formed between described internal layer cylinder body (109) and described outer cylinder block (108), described internal layer cylinder body (109) comprises the internal layer cylinder part (1090) and high pressure blade ring (1091) that are fixed to described outer cylinder block (108) respectively, the narrow annular channel (1092) being communicated with described internal layer cylinder body (109) inside and described second mezzanine space (106) is limited between described internal layer cylinder part (1090) and described high pressure blade ring (1091), described second mezzanine space (106) and described high pressure extraction mouth (105) are interconnected, described first mezzanine space (102) and described second mezzanine space (106) is mutually isolated opens.
8. superhigh pressure impact steam turbine according to claim 1 (100), it is characterized in that, described high pressure cylinder body (10) is also provided with the high pressure extraction mouth (105) being positioned at described high-pressure cylinder steam ouput (101) upstream.
9. the superhigh pressure impact steam turbine (100) according to claim 7 or 8, is characterized in that, described high pressure extraction mouth (105) is that flow is nonadjustable.
10. superhigh pressure impact steam turbine according to claim 1 (100), it is characterized in that, the air inflow of described steam turbine (100) be adjustable and maximum draw gas operating mode time throttle flow reach specified pure condensate operating mode time 1.8-2 doubly.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510357413.XA CN104963728B (en) | 2015-06-25 | 2015-06-25 | A kind of superhigh pressure impact steam turbine |
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