CN204386667U - A kind of supercharging main frame coaxial drive feed water pump system of the little machine that draws gas containing pure condensate - Google Patents
A kind of supercharging main frame coaxial drive feed water pump system of the little machine that draws gas containing pure condensate Download PDFInfo
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- CN204386667U CN204386667U CN201520011881.7U CN201520011881U CN204386667U CN 204386667 U CN204386667 U CN 204386667U CN 201520011881 U CN201520011881 U CN 201520011881U CN 204386667 U CN204386667 U CN 204386667U
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- 230000005494 condensation Effects 0.000 claims abstract description 7
- 238000009833 condensation Methods 0.000 claims abstract description 7
- 239000003245 coal Substances 0.000 abstract description 11
- 230000005611 electricity Effects 0.000 abstract description 3
- 238000010438 heat treatment Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 239000000284 extract Substances 0.000 description 3
- 238000003303 reheating Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000006392 deoxygenation reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009998 heat setting Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Abstract
The utility model provides a kind of supercharging main frame coaxial drive feed water pump system of the little machine that draws gas containing pure condensate, this system is set up the second back pressure and to be drawn gas cylinder, the described second back pressure admission end of cylinder that draws gas is connected with the steam output end of high-pressure cylinder, and the draw gas steam output end of cylinder of the second back pressure is connected with the feed-water end of condensate pump after the second vapour condenser condensation.Of the present utility modelly a kind ofly can improve the generating thermal efficiency further containing the draw gas supercharging main frame coaxial drive feed water pump system of little machine of pure condensate, reduce net coal consumption rate, increase the multiple electricity of unit output simultaneously, increase return on investment.
Description
Technical field
The utility model relates to the thermodynamic system of a kind of feed water pump and preposition unit Driven by Coaxial, particularly, relates to one and to draw gas the supercharging main frame coaxial drive feed water pump system of little machine containing pure condensate.
Background technique
In order to improve the subcritical efficiency waiting low parameter thermal power generation unit, be currently suggested the preposition steam turbine technology of a kind of double reheat, to low parameter steam turbine, set up the preposition cylinder of high parameter, by improving the main vapour parameter of fired power generating unit, and adopt double reheat, reach the object improving overall efficiency of thermal cycle.
But, use this technology to upgrade to subcritical low parameter fired power generating unit, the double reheat boiler needing more to renew, increase preposition cylinder, change the main auxiliary machine equipment such as heater, Overall Reconstruction construction investment is very high, cause investment yield lower, economic aspect does not possess feasibility.
Therefore, related domain in the urgent need to develop a kind of investment yield higher, there is drawing gas the supercharging main frame coaxial drive feed water pump system of little machine containing pure condensate of economic feasibility.
Model utility content
The purpose of this utility model be to provide a kind of earning rate higher, there is drawing gas the supercharging main frame coaxial drive feed water pump system of little machine containing pure condensate of economic feasibility.
The utility model first aspect provides a kind of supercharging main frame coaxial drive feed water pump system of the little machine that draws gas containing pure condensate, and described system comprises:
High parameter Turbo-generator Set, this high parameter Turbo-generator Set is provided with ultra-high pressure cylinder, the first back pressure draws gas cylinder and the first generator;
Low parameter Turbo-generator Set, this low parameter Turbo-generator Set is connected with described high parameter Turbo-generator Set, and there is high-pressure cylinder, intermediate pressure cylinder, low pressure (LP) cylinder and the second generator, between wherein said high-pressure cylinder and described ultra-high pressure cylinder, be connected with the first reheater; And
Backheat and circulation system, this backheat and circulation system are connected with low parameter Turbo-generator Set with described high parameter Turbo-generator Set, and are provided with (i) for the first high-pressure heater of backheat, the second high-pressure heater, oxygen-eliminating device and low-pressure heater and (ii) for the first vapour condenser of thermodynamic cycle, condensate pump and feed water pump group;
Wherein, described high parameter Turbo-generator Set is also provided with the second back pressure and draws gas cylinder, the draw gas admission end of cylinder of described second back pressure is connected with the steam output end of described high-pressure cylinder, and the draw gas steam output end of cylinder of the second back pressure is connected with the feed-water end of condensate pump after the second vapour condenser condensation.
In another preference, the connecting path that described second back pressure is drawn gas between cylinder and high-pressure cylinder is also provided with the second reheater.
In another preference, draw gas with the described second back pressure respectively admission end of cylinder of the steam output end of described high-pressure cylinder is connected with the admission end of described intermediate pressure cylinder.
In another preference, described system is also provided with and is positioned at the second back pressure and draws gas second vapour condenser in cylinder downstream, the draw gas steam output end of cylinder of admission end and second back pressure of described second vapour condenser is connected, and the waterexit end of described second vapour condenser is connected with the feed-water end of described condensate pump.
In another preference, the Processing capacity of described second vapour condenser is the 25%-150% of the first vapour condenser, preferably, and 50%-100%.
In another preference, draw gas draw gas (5,6,7) of cylinder of described second back pressure directly enter low-pressure heater, for heat-setting water.
In another preference, described feed water pump group comprises feedwater main pump and pre feedwater pump, and described feedwater main pump is driven by the first back pressure cylinder that draws gas.
In another preference, draw gas draw gas (1,2,3) of cylinder of described first back pressure directly enter the first high-pressure heater, for heated feed water.
In another preference, described second back pressure draw gas cylinder and the first generator coaxle of cylinder and the first back pressure that draw gas is arranged.
In another preference, described second back pressure draw gas cylinder, the first generator, ultra-high pressure cylinder and feed water pump group of cylinder and the first back pressure of drawing gas is coaxially arranged.
In another preference, described feed water pump is arranged by timing gear roller box and the first back pressure draw gas cylinder and the first generator coaxle of cylinder, ultra-high pressure cylinder, the second back pressure that draw gas.
In another preference, the described first back pressure steam output end of cylinder that draws gas is connected with the admission end of oxygen-eliminating device.
In another preference, described first back pressure draw gas cylinder draw gas end be directly connected with the admission end of the second high-pressure heater.
In another preference, the described second back pressure cylinder that draws gas is not coaxially arranged with ultra-high pressure cylinder.
In another preference, described second back pressure simultaneously also do not draw gas with the first back pressure cylinder, the first generator and the feed water pump of cylinder that draw gas is coaxially arranged.
In another preference, the described second back pressure cylinder that draws gas is connected with the 3rd generator, and drives the 3rd generator.
In another preference, directly draw gas with the admission end of the second high-pressure heater and the first back pressure admission end of cylinder of the steam output end of described ultra-high pressure cylinder is connected.
In another preference, described system is also provided with feed water booster pump, described feed water booster pump by the second back pressure draw gas cylinder drive.
In another preference, the waterexit end of described feed water booster pump is connected with the feed-water end of the second high-pressure heater.
In another preference, the feed-water end of described feed water booster pump is connected with the waterexit end of feed water pump group.
Should be understood that within the scope of the utility model, above-mentioned each technical characteristics of the present utility model and can combining mutually between specifically described each technical characteristics in below (eg embodiment), thus form new or preferred technological scheme.As space is limited, tiredly no longer one by one to state at this.
Accompanying drawing explanation
Fig. 1 is that the back pressure of joining of prior art is drawn gas the structural drawing of supercharging steam turbine thermodynamic system of cylinder.
Fig. 2 is that the back pressure of joining of another kind of prior art is drawn gas the structural drawing of supercharging steam turbine thermodynamic system of cylinder.
Fig. 3 to draw gas containing pure condensate the structural drawing of supercharging main frame coaxial drive feed water pump system of little machine for a kind of shown in the utility model embodiment 1.
Fig. 4 to draw gas containing pure condensate the structural drawing of supercharging main frame coaxial drive feed water pump system of little machine for a kind of shown in the utility model embodiment 2.
Fig. 5 to draw gas containing pure condensate the structural drawing of supercharging main frame coaxial drive feed water pump system of little machine for a kind of shown in the utility model embodiment 3.
Fig. 6 to draw gas containing pure condensate the structural drawing of supercharging main frame coaxial drive feed water pump system of little machine for a kind of shown in the utility model embodiment 4.
Fig. 7 to draw gas containing pure condensate the structural drawing of supercharging main frame coaxial drive feed water pump system of little machine for a kind of shown in the utility model embodiment 5.
Reference character:
C1 low pressure (LP) cylinder
C2 intermediate pressure cylinder
C3 high-pressure cylinder
C4 ultra-high pressure cylinder
BEST back pressure is drawn gas cylinder
BEST-1 first back pressure is drawn gas cylinder
BEST-2 second back pressure is drawn gas vapour
A0 first reheater
A1 second reheater
A2 first vapour condenser
A3 condensate pump
A4 oxygen-eliminating device
A5 feed water pump group
A6 economizer
A7 superheater
A8 feeds water main pump
A9 pre feedwater pump
A10 second vapour condenser
A11 feed water booster pump
B0 timing gear roller box
H1 low-pressure heater
H2 first high-pressure heater
H3 second high-pressure heater
G1 first generator
G2 second generator
G3 the 3rd generator
Embodiment
Claimant of the present utility model finds through research extensive and deep for a long time, set up the second back pressure to draw gas cylinder (BEST-2), make the increase of exerting oneself of corresponding first generator, and the generating thermal efficiency can be improved further, reduce net coal consumption rate, increase the multiple electricity of unit output simultaneously, increase return on investment.On this basis, claimant of the present utility model completes the utility model.
Terminological interpretation
Little machine: small turbine is the auxiliary turbine in main steam turbine thermodynamic system.
Back pressure type: steam discharge is called condensed steam type steam turbine to the steam turbine of subatmospheric vacuum vapour condenser, and steam discharge is called back-pressure turbine to the steam turbine higher than atmospheric piping or heat exchanger.
Draw gas: in the middle of before steam turbine steam discharge, extract steam out.
Cylinder: the through-flow constituent element of steam turbine, usual pressing force is divided into: ultra-high pressure cylinder, high-pressure cylinder, intermediate pressure cylinder, low pressure (LP) cylinder.
Reheating: the steam having done part merit in steam turbine is drawn and again heats, then lead back steam turbine and continue acting.This mode is called reheating.By rational reheating, can exhaust steam moisture be reduced, improve efficiency of thermal cycle.
Supercharging: to low parameter steam turbine, the cylinder of high parameter of connecting above, to improve overall efficiency of thermal cycle, lifting unit generated output.
Preposition unit: to be drawn gas the small generation set that cylinder (BEST), generator, timing gear roller box, feed water pump be connected into by ultra-high pressure cylinder, back pressure.
Major advantage of the present utility model:
(1) the technical solution of the utility model can improve the generating thermal efficiency further, reduce net coal consumption rate, increase the multiple electricity of unit output simultaneously, increase return on investment, technology is made to become economically feasible, for extensive use creates conditions, and meet part engineering when upgrading to the demand of arranging.
(2) for typical 300MW Subcritical Units, the technical solution of the utility model can reduce >=net coal consumption rate of 30g/kW.h, increase 150MW and exert oneself above, pay off period was less than 6 years; For typical 600MW Subcritical Units, adopt the technical solution of the utility model, can reduce >=the net coal consumption rate of 30g/kW.h, increase 300MW and exert oneself above, pay off period was less than 6 years.While there is good energy-saving and environmental protection social benefit, also there is good economic feasibility.
(3) technical solutions of the utility model are used, can flexible arrangement relevant device, be applicable to the improvement project that part restrictive condition is more.
(4) the low parameter fired power generating unit that the technical solution of the utility model can be used for having run is transformed, and also can be used for newly-built high pressure high temperature turbosets.
Below in conjunction with specific embodiment, set forth the utility model further.Should be understood that following examples are only not used in restriction scope of the present utility model for illustration of the utility model.
Embodiment 1
Fig. 3 is the structural drawing of supercharging main frame coaxial drive feed water pump system of a kind of little machine that draws gas containing pure condensate in the utility model embodiment 1.
With shown in Fig. 2 join back pressure draw gas cylinder supercharging steam turbine thermodynamic system compared with, the second back pressure that the utility model has set up prior art not to be had is drawn gas cylinder (BEST-2) and the second vapour condenser, as shown in the figure, the first reheater should be had containing the draw gas supercharging main frame coaxial drive feed water pump system of little machine of pure condensate, second reheater, first vapour condenser, second vapour condenser, condensate pump, oxygen-eliminating device, superheater, economizer, feedwater main pump, pre feedwater pump, timing gear roller box, first generator, second generator, first back pressure is drawn gas cylinder (BEST-1), second back pressure is drawn gas cylinder (BEST-2), ultra-high pressure cylinder, high-pressure cylinder, intermediate pressure cylinder, low pressure (LP) cylinder, low-pressure heater, first high-pressure heater, second high-pressure heater.Wherein, high-pressure cylinder, intermediate pressure cylinder, low pressure (LP) cylinder and the second generator etc. constitute low parameter Turbo-generator Set; Draw gas cylinder, the first generator of ultra-high pressure cylinder, the first back pressure constitutes high parameter Turbo-generator Set; Low parameter Turbo-generator Set is connected with high parameter Turbo-generator Set.For the first high-pressure heater of backheat, the second high-pressure heater, oxygen-eliminating device, low-pressure heater and for thermodynamic cycle, the first vapour condenser, the second vapour condenser, condensate pump, feedwater main pump, pre feedwater pump etc. constitute backheat and circulation system, backheat and circulation system are connected with low parameter Turbo-generator Set with described high parameter Turbo-generator Set.Low-pressure heater and high-pressure heater can be multistage heaters.
In Fig. 3, the flow process of system is as follows:
Ultra-high pressure cylinder is entered by boiler superheater high parameter main steam out, acting rear portion steam discharge enters the first reheater heating, single reheat steam after intensification enters high-pressure cylinder and continues acting, the steam discharge of high-pressure cylinder enters the heating of boiler second reheater, a double reheat steam part after intensification enters intermediate pressure cylinder, intermediate pressure cylinder steam discharge after acting enters low pressure (LP) cylinder and continues acting, and the low pressure (LP) cylinder steam discharge after acting enters the first vapour condenser, and cooling becomes water of condensation.
A part of steam discharge of ultra-high pressure cylinder enters the first back pressure and to draw gas cylinder (also referred to as BEST-1), extracts steam out, as the vapour source of the first high-pressure heater, oxygen-eliminating device in many places from front to back from the draw gas centre of cylinder of the first back pressure.
A double reheat steam part after intensification enters the second back pressure and to draw gas cylinder (also referred to as BEST-2), from the second back pressure draw gas cylinder centre from front to back many places extract out steam, as the vapour source of part low-pressure heater, steam discharge removes the second vapour condenser, and cooling becomes water of condensation.
First vapour condenser and the second vapour condenser water of condensation are out boosted through condensate pump, enter low-pressure heater heating, enter oxygen-eliminating device heating subsequently and deoxygenation.Oxygen-eliminating device water of condensation out, through feed water pump front-mounted pump and the boosting of feedwater main pump, enters the first high-pressure heater heating, finally enters boiler economizer, carry out thermodynamic cycle.
Feedwater main pump is composed in series preposition unit, Driven by Coaxial by timing gear roller box and ultra-high pressure cylinder, the first back pressure cylinder, the first generator, the second back pressure cylinder that draws gas that draws gas;
With shown in Fig. 2 join back pressure draw gas cylinder supercharging steam turbine thermodynamic system compared with, the utility model embodiment 1 adds the second back pressure to draw gas the increase of exerting oneself of cylinder (BEST-2), corresponding first generator containing the draw gas supercharging main frame coaxial drive feed water pump system of little machine of pure condensate.Further, the discharge capacity of ultra-high pressure cylinder increases further, the increase of exerting oneself of corresponding first generator; The minimizing of drawing gas of high-pressure cylinder, intermediate pressure cylinder, the increase of exerting oneself of corresponding second generator; Realize vapour amount balance by the second vapour condenser, strengthen steam flow.
The technological scheme of embodiment 1 can reduce >=net coal consumption rate of 30g/kW.h.
Embodiment 2
Fig. 4 is the structural drawing of supercharging main frame coaxial drive feed water pump system of a kind of little machine that draws gas containing pure condensate in the utility model embodiment 2.
Embodiment 2 of the present utility model is similar to embodiment 1, and difference is: drawing gas from the first back pressure of the second high-pressure heater is drawn gas drawing gas to draw and connecing of cylinder, and the draw gas discharge capacity of cylinder of ultra-high pressure cylinder and the first back pressure increases, the increase of exerting oneself of corresponding first generator.
The technological scheme of embodiment 2 can reduce >=net coal consumption rate of 30g/kW.h.
Embodiment 3
Fig. 5 is the structural drawing of supercharging main frame coaxial drive feed water pump system of a kind of little machine that draws gas containing pure condensate in the utility model embodiment 3.
Embodiment 3 of the present utility model is similar to embodiment 2, and difference is: the second back pressure no longer draw gas with ultra-high pressure cylinder, the first back pressure cylinder, the first generator, feed water pump of cylinder that draw gas is coaxially arranged, and according to requirement of engineering, can arrange separately, flexibility increases.The second back pressure cylinder that draws gas sets up the 3rd generator, and surplus power is by the 3rd electrical power generators.
The technological scheme of embodiment 3 can reduce >=net coal consumption rate of 30g/kW.h.
Embodiment 4
Fig. 6 is the structural drawing of supercharging main frame coaxial drive feed water pump system of a kind of little machine that draws gas containing pure condensate in the utility model embodiment 4.
Embodiment 4 of the present utility model is similar to embodiment 3, and difference is: before the second inlet of high pressure heater, increase feed water booster pump, by the second back pressure draw gas cylinder drive.To old low parameter Transformation of Unit, feed water pump group can be changed and drive little machine or motor, former multistage pressure heater need not be changed, significantly can reduce engineering cost.Simultaneously feed water booster pump the second back pressure cylinder that draws gas drives, saving station service.
The technological scheme of embodiment 4 can reduce >=net coal consumption rate of 30g/kW.h.
Embodiment 5
Fig. 7 is the structural drawing of supercharging main frame coaxial drive feed water pump system of a kind of little machine that draws gas containing pure condensate in the utility model embodiment 5.
The utility model embodiment 5 is similar to embodiment 4, and difference is: feed water booster pump is located at the outlet of feed water pump group.Compared with embodiment 4, the inlet temperature of feed water booster pump is lower, and the technical difficulty of booster pump is low, and operational reliability is high.
The technological scheme of embodiment 5 can reduce >=net coal consumption rate of 30g/kW.h.
Comparative example 1
Compared with embodiment 1, difference is: the second back pressure admission end of cylinder that draws gas is connected with the steam output end of ultra-high pressure cylinder, and the draw gas steam output end of cylinder of the second back pressure is connected with oxygen-eliminating device.
Compared with embodiment 1, the technological scheme of comparative example 1 can only reduce the net coal consumption rate of about 10g/kW.h.
The all documents mentioned at the utility model are quoted as a reference all in this application, are just quoted separately as a reference as each section of document.In addition should be understood that those skilled in the art can make various changes or modifications the utility model, and these equivalent form of values fall within the application's appended claims limited range equally after having read above-mentioned instruction content of the present utility model.
Claims (9)
1. to draw gas the supercharging main frame coaxial drive feed water pump system of little machine containing pure condensate, it is characterized in that, comprising:
High parameter Turbo-generator Set, this high parameter Turbo-generator Set is provided with ultra-high pressure cylinder, the first back pressure draws gas cylinder and the first generator;
Low parameter Turbo-generator Set, this low parameter Turbo-generator Set is connected with described high parameter Turbo-generator Set, and there is high-pressure cylinder, intermediate pressure cylinder, low pressure (LP) cylinder and the second generator, between wherein said high-pressure cylinder and described ultra-high pressure cylinder, be connected with the first reheater; And
Backheat and circulation system, this backheat and circulation system are connected with low parameter Turbo-generator Set with described high parameter Turbo-generator Set, and are provided with (i) for the first high-pressure heater of backheat, the second high-pressure heater, oxygen-eliminating device and low-pressure heater and (i i) for the first vapour condenser of thermodynamic cycle, condensate pump and feed water pump group;
Wherein, described high parameter Turbo-generator Set is also provided with the second back pressure and draws gas cylinder, the draw gas admission end of cylinder of described second back pressure is connected with the steam output end of described high-pressure cylinder, and the draw gas steam output end of cylinder of the second back pressure is connected with the feed-water end of condensate pump after the second vapour condenser condensation.
2. the system as claimed in claim 1, is characterized in that, described second back pressure draw gas cylinder and the first generator coaxle of cylinder and the first back pressure that draw gas is arranged.
3. the system as claimed in claim 1, is characterized in that, described second back pressure draw gas cylinder, the first generator, ultra-high pressure cylinder and feed water pump group of cylinder and the first back pressure of drawing gas is coaxially arranged.
4. the system as claimed in claim 1, is characterized in that, the described second back pressure cylinder that draws gas is not coaxially arranged with ultra-high pressure cylinder.
5. system as claimed in claim 4, is characterized in that, the described second back pressure cylinder that draws gas is connected with the 3rd generator, and drives the 3rd generator.
6. system as claimed in claim 4, is characterized in that, directly draw gas with the admission end of the second high-pressure heater and the first back pressure admission end of cylinder of the steam output end of described ultra-high pressure cylinder is connected.
7. system as claimed in claim 4, it is characterized in that, described system is also provided with feed water booster pump, and described feed water booster pump is driven by the second back pressure cylinder that draws gas.
8. system as claimed in claim 7, it is characterized in that, the waterexit end of described feed water booster pump is connected with the feed-water end of the second high-pressure heater.
9. system as claimed in claim 7, it is characterized in that, the feed-water end of described feed water booster pump is connected with the waterexit end of feed water pump group.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520011881.7U CN204386667U (en) | 2015-01-08 | 2015-01-08 | A kind of supercharging main frame coaxial drive feed water pump system of the little machine that draws gas containing pure condensate |
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| CN201520011881.7U CN204386667U (en) | 2015-01-08 | 2015-01-08 | A kind of supercharging main frame coaxial drive feed water pump system of the little machine that draws gas containing pure condensate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105822360A (en) * | 2015-01-08 | 2016-08-03 | 国电浙江北仑第发电有限公司 | Pressurization main machine coaxial driving feed water pump system comprising pure condensing steam extraction small steam turbine |
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2015
- 2015-01-08 CN CN201520011881.7U patent/CN204386667U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105822360A (en) * | 2015-01-08 | 2016-08-03 | 国电浙江北仑第发电有限公司 | Pressurization main machine coaxial driving feed water pump system comprising pure condensing steam extraction small steam turbine |
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