CN208621325U - A kind of device measuring exhaust enthalpy of low pressure cylinder of steam turbine value - Google Patents
A kind of device measuring exhaust enthalpy of low pressure cylinder of steam turbine value Download PDFInfo
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- CN208621325U CN208621325U CN201821565668.0U CN201821565668U CN208621325U CN 208621325 U CN208621325 U CN 208621325U CN 201821565668 U CN201821565668 U CN 201821565668U CN 208621325 U CN208621325 U CN 208621325U
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Abstract
The utility model relates to a kind of devices for measuring exhaust enthalpy of low pressure cylinder of steam turbine value, it include: First Heat Exchanger, First Heat Exchanger has the first steam inlet, the first steam (vapor) outlet, the first flow inlet and the first water export, and the steam discharge of turbine low pressure cylinder enters First Heat Exchanger by the first steam inlet；High-temperature water enters First Heat Exchanger by the first flow inlet；Second heat exchanger, second heat exchanger has the second steam inlet, the second steam (vapor) outlet, the second flow inlet and the second water export, second steam inlet is connected with the first steam (vapor) outlet, second flow inlet is connected with the first water export, and the enthalpy of turbine low pressure cylinder steam discharge can be calculated using the device combination conservation of energy principle.Enthalpy is exhausted using the device, and to calculate acquisition parameter few, and it is higher to calculate easy and measurement accuracy, can provide theoretical reference for work such as energy saving optimizing, the diagnosis of fired power generating unit.
Description
Technical field
The utility model relates to the parametric measurement field of exhaust enthalpy of low pressure cylinder of steam turbine value, in particular to a kind of measurement steamer
The device of machine low pressure (LP) cylinder steam discharge enthalpy.
Background technique
Steam turbine is the key equipment in thermal power station, in order to guarantee its normal operating, needs periodically to carry out heating power to it
The thermal performance diagnostic analysis of performance test, either Steam Turbine and its related system, or to the calculating of test result, repair
Just etc., it requires to calculate exhaust enthalpy of low pressure cylinder of steam turbine value.
During steam turbine operation, moist steam region, the pressure of moist steam are belonged to from final stage steam extraction to low pressure (LP) cylinder steam discharge
It is not independent variable with temperature, needs the mass dryness fraction of moist steam that can determine the state parameter of moist steam, otherwise can not obtain vapour
Turbine low pressure (LP) cylinder steam discharge enthalpy.However, the measurement for dryness of wet steam, current basic not mature and stable engineering survey side
Method, therefore exhaust enthalpy of low pressure cylinder of steam turbine value also just can not be obtained accurately, be related to steam discharge enthalpy measuring both at home and abroad and ground with what is calculated
Studying carefully has very much, but mostly complex, and influence factor is more, precision is not high.
Therefore, how accurately measure exhaust enthalpy of low pressure cylinder of steam turbine value, so as to for fired power generating unit energy saving optimizing, examine
It is disconnected that work is waited to provide with reference to the technical issues of being current those skilled in the art's urgent need to resolve.
Utility model content
The first purpose of the utility model is to disclose a kind of device for measuring exhaust enthalpy of low pressure cylinder of steam turbine value, so as to energy
It is enough simply and accurately to measure exhaust enthalpy of low pressure cylinder of steam turbine value, thermal performance diagnosis point is carried out to steam turbine using the enthalpy
Analysis, to provide reference for work such as energy saving optimizing, the diagnosis of fired power generating unit.
In order to achieve the above objectives, the device of measurement exhaust enthalpy of low pressure cylinder of steam turbine value provided by the utility model includes:
First Heat Exchanger, the First Heat Exchanger have the first steam inlet, the first steam (vapor) outlet, the first flow inlet and
The steam discharge of first water export, turbine low pressure cylinder enters the First Heat Exchanger by first steam inlet；High-temperature water by
First flow inlet enters the First Heat Exchanger；
Second heat exchanger, second heat exchanger have the second steam inlet, the second steam (vapor) outlet, the second flow inlet and
Second water export, second steam inlet are connected with first steam (vapor) outlet, second flow inlet and described the
One water export is connected；
The steam discharge is heated to be a superheated steam, the primary overheat by the high-temperature water at the First Heat Exchanger
Steam is heated to be secondary superheated steam at second heat exchanger；The high-temperature water after the First Heat Exchanger is put
Temperature lowering water of thermosetting, the temperature lowering water heat release after second heat exchanger form reducing temperature twice water；
Enthalpy measuring device, the enthalpy of the steam discharge are h1, the enthalpy measuring device is for measuring the primary overheat
The enthalpy h of steam2, measure the enthalpy h of the secondary superheated steam3；Measure the enthalpy H of the high-temperature water1, measure described primary
The enthalpy H of temperature lowering water2, measure the enthalpy H of the reducing temperature twice water3；
It is calculated according to conservation of energy principle:
It preferably, further include vapor collecting apparatus for collecting the steam discharge of the turbine low pressure cylinder, the steam is received
Acquisition means include one or more steam collector units, and any one steam collector unit includes more collection branch pipes and one
Root collecting pipe, wherein described collecting pipe one end is connected with the collection branch pipe, and the other end is connected with first steam inlet；
The branch pipe of collecting offers multiple for being distributed in the cross-section of condenser throat on any one collection branch pipe
Steam collects hole, and the steam flow that each steam collects hole is equal.
Preferably, adjacent two spacing collected between branch pipe are equal.
Preferably, the vapor collecting apparatus includes multiple steam collector units, multiple steam collector units
In the collecting pipe be connected with main steam range, the main steam range is directly connected with first steam inlet.
Preferably, throttle is additionally provided in the main steam range.
Preferably, second steam (vapor) outlet is connect with cooling equipment, the condensation-water drain and condensing of the cooling equipment
Device connection.
Preferably, the cooling equipment is additionally provided with steam outlet, and the steam outlet passes through vacuum pump and condensing
Device connection.
Preferably, second water export is connect with condenser.
In the device of measurement exhaust enthalpy of low pressure cylinder of steam turbine value disclosed in the utility model, it is assumed that pass through First Heat Exchanger
Flow with the high-temperature water of the second heat exchanger is Q, is q by the exhaust steam flow of First Heat Exchanger and the second heat exchanger, passes through height
Warm water in First Heat Exchanger and heats the steam discharge of turbine low pressure cylinder in the second heat exchanger respectively, inhales steam discharge respectively
Thermal transition is a superheated steam and secondary superheated steam, and the high-temperature water after First Heat Exchanger and the second heat exchanger heat release
It is separately converted to a temperature lowering water and reducing temperature twice water, a superheated steam enthalpy h2, secondary superheated steam enthalpy h3It can pass through
The pressure and temperature of measurement superheated steam accurately measures；High-temperature water enthalpy H1, a temperature lowering water enthalpy H2With reducing temperature twice water enthalpy
H3It can also accurately be measured by measuring the pressure and temperature of water, since heat-exchange time is very short, in the feelings for not considering heat exchange loss
Under condition, energy should conservation, it therefore follows that:
(h1-h2) q=(H1-H2)Q (1)
(h2-h3) q=(H2-H3)Q (2)
By (1) formula and (2) formula it follows thatAs it can be seen that public using the utility model institute
The steam discharge of turbine low pressure cylinder can be heated to be superheated steam by the device opened, and can calculate steamer in conjunction with conservation of energy principle
The enthalpy of machine low pressure (LP) cylinder steam discharge, using the device carry out exhaust enthalpy of low pressure cylinder of steam turbine value calculating when acquisition parameter it is few, calculate
Easy and measurement accuracy is higher, can provide theoretical reference for work such as energy saving optimizing, the diagnosis of fired power generating unit.
Detailed description of the invention
Fig. 1 is the original of the device of the measurement exhaust enthalpy of low pressure cylinder of steam turbine value disclosed in a kind of embodiment of the utility model
Manage schematic diagram；
Fig. 2 is that the vapor collecting apparatus disclosed in a kind of embodiment of the utility model is illustrated in the distribution of condenser throat
Figure.
Wherein, 1 is First Heat Exchanger, and 2 be the second heat exchanger, and 3 be condenser, and 4 is collect branch pipe, and 5 be collecting pipe, and 6 are
Main steam range, 7 be throttle, and 8 be cooling equipment, and 9 be vacuum pump, and 10 be first switch valve, and 11 be second switch valve, and 12 are
Steam collects hole.
Specific embodiment
One of core of the utility model is to provide a kind of device for measuring exhaust enthalpy of low pressure cylinder of steam turbine value, so as to energy
It is enough simply and accurately to measure exhaust enthalpy of low pressure cylinder of steam turbine value, thermal performance diagnosis point is carried out to steam turbine using the enthalpy
Analysis, to provide reference for work such as energy saving optimizing, the diagnosis of fired power generating unit.
It is disclosed in an embodiment of the present invention as shown in Figures 1 and 2 incorporated by reference to Fig. 1 and Fig. 2, the arrow in Fig. 1
The flow direction of steam or water flow is represented, the device of the measurement exhaust enthalpy of low pressure cylinder of steam turbine value disclosed in the utility model, including
First Heat Exchanger 1, the second heat exchanger 2 and enthalpy measuring device, First Heat Exchanger 1 have the first steam inlet, the first steam
The steam discharge of outlet, the first flow inlet and the first water export, turbine low pressure cylinder enters the first heat exchange by the first steam inlet
In device, high-temperature water is entered in First Heat Exchanger 1 by the first flow inlet, and there is the second heat exchanger 2 second steam inlet, second to steam
Vapor outlet, the second flow inlet and the second water export, the second steam inlet are connected with the first steam (vapor) outlet, and the second water flows into
Mouth is connected with the first water export；
Turbine low pressure cylinder steam discharge is heated to be a superheated steam by high-temperature water at First Heat Exchanger 1, and primary overheat is steamed
Vapour is heated to be secondary superheated steam at the second heat exchanger 2；High-temperature water heat release after First Heat Exchanger 1 forms primary drop
Warm water, a temperature lowering water heat release after the second heat exchanger 2 form reducing temperature twice water；
The enthalpy of turbine low pressure cylinder steam discharge is set as h1, enthalpy measuring device is for measuring the enthalpy of a superheated steam
h2, measure the enthalpy h of secondary superheated steam3；Measure the enthalpy H of high-temperature water1, measure the enthalpy H an of temperature lowering water2, measure secondary
The enthalpy H of temperature lowering water3；
Assuming that being Q by the flow of First Heat Exchanger and the high-temperature water of the second heat exchanger, pass through First Heat Exchanger and second
The exhaust steam flow of heat exchanger be q, do not consider heat exchange loss in the case where, energy should conservation, it therefore follows that:
(h1-h2) q=(H1-H2)Q (1)
(h2-h3) q=(H2-H3)Q (2)
By (1) formula and (2) formula it follows that
As it can be seen that the steam discharge of turbine low pressure cylinder can be heated to be superheated steam using device disclosed in the utility model
Afterwards, the enthalpy that turbine low pressure cylinder steam discharge is calculated in conjunction with conservation of energy principle carries out turbine low pressure cylinder row using the device
The parameter of vapour enthalpy required acquisition when calculating is few, calculates simplicity and measurement accuracy is higher, can be excellent for the energy conservation of fired power generating unit
The work such as change, diagnosis provide theoretical reference.
The flow q of steam discharge and the flow Q unit of high-temperature water are t/h (ton/hour), by steam discharge enthalpy h1Calculating it is public
Formula can be seen that steam discharge enthalpy h1Calculating will not use the flow q of the steam discharge and flow Q of high-temperature water, therefore, above-mentioned implementation
The flow q of steam discharge in example and the flow Q specific size of high-temperature water are unrestricted, can be adjusted according to physical device
It is whole.
The unit of enthalpy is kJ/kg (kilojoule per kilogram), the enthalpy h of a superheated steam2, secondary superheated steam enthalpy
h3, high-temperature water enthalpy measuring H1, temperature lowering water enthalpy H2And the enthalpy H of reducing temperature twice water3Measurement by pressure and
Temperature can obtain, and the measurement of the enthalpy of dry saturated steam and water has been techniques known, in present specification not to this
It is repeated again.
It is specifically that will be arranged from the throat of condenser 3 in the present embodiment in order to facilitate the extraction of the steam discharge of turbine low pressure cylinder
Vapour is drawn, and the position that can draw high-temperature water is more, such as water outlet, water outlet of high-pressure heater of low-pressure heater etc., this
High-temperature water is drawn from the water outlet of the lower low-pressure heater of pressure in embodiment.Further, first is entered in steam discharge
It before heat exchanger 1, is also throttled to steam discharge in the present embodiment, to improve the mass dryness fraction of steam discharge, guarantees that steam discharge is changed by first
It can be heated to form superheated steam after hot device 1, facilitate the measurement of enthalpy.
In order to guarantee the authenticity and accuracy of collected turbine low pressure cylinder steam discharge, use is also provided in the present embodiment
In the vapor collecting apparatus for collecting steam discharge, vapor collecting apparatus includes one or more steam collector unit, each steam
Collector unit includes more collection branch pipes 4 and a collecting pipe 5, and 5 one end of collecting pipe passes through banjo connector and collection 4 phase of branch pipe
Even, the other end is directly or indirectly connected with the first steam inlet, collects branch pipe 4 and is distributed at the cross section of 3 throat of condenser, such as
Multiple steam are offered shown in Fig. 1 and Fig. 2, and on each collection branch pipe 4 and collect hole 12, so as to collect condensing
The steam discharge of each position of 3 throat of device, steam are collected hole 12 and are opened up along the axial direction for collecting branch pipe 4, and its more intensive sampling is reliable
Property it is higher, in order to guarantee accuracy, the flow for needing each steam to collect hole 12 is equal, at each position of condenser 3
Steam flow rate is different, it is therefore desirable to steam collection hole is designed as by different sizes according to the flow velocity at each position of condenser 3,
To guarantee that the steam flow for collecting hole 12 by each steam is equal.
As shown in Figures 1 and 2, any adjacent two spacing collected between branch pipe 4 is equal, this can guarantee as far as possible
The authenticity for the steam discharge sample being collected into, according to the difference of 3 quantity of condenser, different number has been can be set in vapor collecting apparatus
Steam collector unit, steam collector unit is identical as the quantity of condenser 3, the collecting pipe in multiple steam collector units
5 are connected with main steam range 6 by connector (such as threeway), and main steam range 6 is directly connected with the first steam inlet.
In order to improve the mass dryness fraction of steam discharge, guarantee that steam discharge can be heated to form superheated steam after First Heat Exchanger 1, originally
Throttle 7 is also provided in embodiment in main steam range 6, as shown in fig. 1.
As shown in fig. 1, the second steam (vapor) outlet is also connect with cooling equipment 8, and the cooling of circulation is connected in cooling equipment 8
Water, under the action of cooling equipment 8, a part of steam condensation is liquid water, which will deposit to cooling 8 bottom of equipment
The liquid water of deposition can be delivered to if necessary in condenser 3 by portion by way of switch valve is arranged.
In order to make not formed the steam circulation of liquid water, steam outlet, discharge of steam are additionally provided in cooling equipment 8
Mouth is connect by vacuum pump 9 with condenser 3.
As shown in fig. 1, high-temperature water is drawn from the water outlet of low-pressure heater, after opening first switch valve 10, high-temperature water
It can enter in First Heat Exchanger 1 and the second heat exchanger 2, the second water flow in order to realize the circulation of high-temperature water, in the present embodiment
Outlet is connect with condenser 3, after opening second switch valve 11, reducing temperature twice water can be sent into condenser 3 and realize high-temperature water
Circulation.
The method and device of measurement exhaust enthalpy of low pressure cylinder of steam turbine value provided by the utility model has been carried out in detail above
It is thin to introduce.Specific case used herein is expounded the principles of the present invention and embodiment, above embodiments
Explanation be merely used to help understand the method and its core concept of the utility model.It should be pointed out that for the art
For those of ordinary skill, without departing from the principle of this utility model, several change can also be carried out to the utility model
Into and modification, modifications and modifications also fall within the protection scope of the claims of the utility model.
Claims (8)
1. a kind of device for measuring exhaust enthalpy of low pressure cylinder of steam turbine value characterized by comprising
First Heat Exchanger (1), the First Heat Exchanger (1) have the first steam inlet, the first steam (vapor) outlet, the first flow inlet
The First Heat Exchanger (1) is entered by first steam inlet with the steam discharge of the first water export, turbine low pressure cylinder；High temperature
Water enters the First Heat Exchanger (1) by first flow inlet；
Second heat exchanger (2), second heat exchanger (2) have the second steam inlet, the second steam (vapor) outlet, the second flow inlet
With the second water export, second steam inlet is connected with first steam (vapor) outlet, second flow inlet with it is described
First water export is connected；
The steam discharge is heated to be a superheated steam, the primary overheat by the high-temperature water at the First Heat Exchanger (1)
Steam is heated to be secondary superheated steam at second heat exchanger (2)；The height after the First Heat Exchanger (1)
Warm water heat release forms a temperature lowering water, and the temperature lowering water heat release after second heat exchanger (2) forms secondary drop
Warm water；
Enthalpy measuring device, the enthalpy of the steam discharge are h1, the enthalpy measuring device is for measuring a superheated steam
Enthalpy h2, measure the enthalpy h of the secondary superheated steam3；Measure the enthalpy H of the high-temperature water1, measure a temperature lowering water
Enthalpy H2, measure the enthalpy H of the reducing temperature twice water3；
It is calculated according to conservation of energy principle:
2. the device of measurement exhaust enthalpy of low pressure cylinder of steam turbine value according to claim 1, which is characterized in that further include being used for
The vapor collecting apparatus of the steam discharge of the turbine low pressure cylinder is collected, the vapor collecting apparatus includes that one or more steam are received
Collect unit, any one steam collector unit includes more collection branch pipe (4) He Yigen collecting pipes (5), wherein the remittance
Flow tube (5) one end is connected with the collection branch pipe (4), and the other end is connected with first steam inlet；The collection branch pipe (4)
For being distributed in the cross-section of condenser (3) throat, multiple steam are offered on any one collection branch pipe (4) and are received
Collect hole (12), and the steam flow that each steam collects hole (12) is equal.
3. the device of measurement exhaust enthalpy of low pressure cylinder of steam turbine value according to claim 2, which is characterized in that adjacent two institutes
It is equal to state the spacing collected between branch pipe (4).
4. the device of measurement exhaust enthalpy of low pressure cylinder of steam turbine value according to claim 2, which is characterized in that the steam is received
Acquisition means include multiple steam collector units, and the collecting pipe (5) in multiple steam collector units is and steam
General pipeline (6) is connected, and the main steam range (6) is directly connected with first steam inlet.
5. the device of measurement exhaust enthalpy of low pressure cylinder of steam turbine value according to claim 4, which is characterized in that the steam is total
Throttle (7) are additionally provided on pipe (6).
6. the device of measurement exhaust enthalpy of low pressure cylinder of steam turbine value according to claim 1, which is characterized in that described second steams
Vapor outlet is connect with cooling equipment (8), and the condensation-water drain of the cooling equipment (8) is connect with condenser (3).
7. the device of measurement exhaust enthalpy of low pressure cylinder of steam turbine value according to claim 6, which is characterized in that the cooling is set
Standby (8) are additionally provided with steam outlet, and the steam outlet is connect by vacuum pump (9) with condenser (3).
8. the device of measurement exhaust enthalpy of low pressure cylinder of steam turbine value according to claim 6, which is characterized in that second water
Outflux is connect with condenser.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821565668.0U CN208621325U (en) | 2018-09-25 | 2018-09-25 | A kind of device measuring exhaust enthalpy of low pressure cylinder of steam turbine value |
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| CN201821565668.0U CN208621325U (en) | 2018-09-25 | 2018-09-25 | A kind of device measuring exhaust enthalpy of low pressure cylinder of steam turbine value |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108931378A (en) * | 2018-09-25 | 2018-12-04 | 国电科学技术研究院有限公司 | A kind of method and device measuring exhaust enthalpy of low pressure cylinder of steam turbine value |
| CN114235896A (en) * | 2021-12-23 | 2022-03-25 | 中国核动力研究设计院 | Saturated steam dryness measuring device |
-
2018
- 2018-09-25 CN CN201821565668.0U patent/CN208621325U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108931378A (en) * | 2018-09-25 | 2018-12-04 | 国电科学技术研究院有限公司 | A kind of method and device measuring exhaust enthalpy of low pressure cylinder of steam turbine value |
| CN108931378B (en) * | 2018-09-25 | 2024-01-05 | 国家能源集团科学技术研究院有限公司 | Method and device for measuring exhaust enthalpy value of low-pressure cylinder of steam turbine |
| CN114235896A (en) * | 2021-12-23 | 2022-03-25 | 中国核动力研究设计院 | Saturated steam dryness measuring device |
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Address after: No. 10 Wonderland Road, Qixia District, Nanjing City, Jiangsu Province Patentee after: National Energy Group Science and Technology Research Institute Co.,Ltd. Address before: No. 10 Wonderland Road, Qixia District, Nanjing City, Jiangsu Province Patentee before: GUODIAN SCIENCE AND TECHNOLOGY RESEARCH INSTITUTE Co.,Ltd. |
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