CN110332021A - A kind of DEH system adjusting valve overlap standardization setting method - Google Patents
A kind of DEH system adjusting valve overlap standardization setting method Download PDFInfo
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- CN110332021A CN110332021A CN201910499388.7A CN201910499388A CN110332021A CN 110332021 A CN110332021 A CN 110332021A CN 201910499388 A CN201910499388 A CN 201910499388A CN 110332021 A CN110332021 A CN 110332021A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
- F01D21/003—Arrangements for testing or measuring
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Abstract
A kind of DEH system adjusts valve overlap identification and setting method, the method establishes the quantizating index of DEH system degree of overlapping, and valve position measuring device is provided with based on all Steam Turbine regulating valves in scene, therefrom determining and verifying valve position stepping safety limit is the unique constraints condition for influencing to adjust valve overlap adjusting, realizes and is detached from the identification of the adjusting valve overlap of pressure piling degree and close association control valve position and standardization adjusting.Through emulation and field demonstration, the method of the present invention institute promoting or transferring section valve overlap standardize setting method and 6%~10% valve position stepping safety limit, both it can guarantee that large-amplitude sloshing did not occurred in regulating valve overlapping region flow linear smoothing, high-pressure governing valve, it realizes into vapour precise control of flew and speed-regulating system safe operation, it can reduce again and adjust the restriction loss of valve group overlapping region, give full play to the power savings advantages of multistep sequence valve control unit valve point operation；Work can be adjusted for same type units discharge characteristic and adjusts valve overlap setting, and reference is provided.
Description
Technical field
The present invention relates to a kind of DEH systems to adjust valve overlap standardization setting method, belongs to steam turbine operation technical field.
Background technique
DEH (Digital Electro-Hydraulic Control System) number has been widely used in modern Steam Turbine
Word electrohydraulic control system implements management valve, and generallys use nozzle governing, pure throttling with vapour or overload filling throttling with vapour etc.
Distribution way of steam.
Valve control mode into steam control valve is directly related with vapour function with DEH system, has single step sequence valve control mode (i.e. synchronous
Sequence), for example, the homophony valve method of synchronization of steam turbine group is matched in the single valve mode of nozzle governing unit and pure throttling；Also there is multistep sequence valve
Prosecutor formula (i.e. asynchronous sequence), for example, configuration four is suitable into steam control valve nozzle governing unit " GV1/2 → GV3 → GV4 " three step sequences
" homophony valve-filling valve " two step sequence sequence valve valve control mode of steam turbine group is matched in sequence valve valve control mode and overload filling throttling.
When Steam Turbine uses multistep sequence valve control mode, back sequence regulating valve (group) opens the practical stream flowed through to it
When amount reaches some value with the ratio between the maximum stream flow (referring to valve wide open) that can be flowed through, subsequent adjustment valve (group) must be opened in advance,
To compensate the nonlinear characteristic of preceding valve (group), this amount opened in advance, referred to as adjusting valve overlap.Due to passing through regulating valve
Steam flow operating condition is complicated and can not survey, and generallys use pressure piling degree in the industry as the measurement and reference for adjusting valve overlap
Standard, it is generally recognized that when the forward and backward pressure ratio of valve is 0.95~0.98, valve standard-sized sheet, thus, it is considered that it opens in preceding valve to pressure
When than 0.85~0.90, rear valve unlatching is more appropriate, i.e., between pressure piling degree ξ p value 0.10~0.15.However, most of
Electro-hydraulic adjusting unit does not arrange the forward and backward pressure-measuring-point of standby regulating valve, therefore, it is impossible to measure and supervise pressure piling degree.
Adjusting valve overlap adjusting is the important ring using the steam turbine discharge characteristic adjusting work of multistep sequence valve control mode
Section.Currently, for the understanding of DEH system adjusting valve overlap, there is also the understanding that previous hydraulic speed regulation system carries in the industry
Mistaken ideas.Adjust the operation or work standard that valve overlap adjusting missing more standardizes.Firepower peak load regulation frequency modulation task it is increasingly serious with
And under the more urgent dual prospect of Power Plant Energy Saving, specification Steam Turbine adjusts the importance of valve overlap adjusting work
And urgency gradually shows, and is the major issue of field technician's general concern.
For objective, single index as such as " stroke degree of overlapping " or " pressure piling degree " both can not be examined comprehensively
Or all intensions of evaluation degree of overlapping, it is also difficult to which reply adjusts all links in the valve overlap adjusting course of work.To be formed
Degree of overlapping identification and standardization setting method, it is necessary to start with from theory and practice experience, it is established that the amount of DEH system degree of overlapping
Change index.
Publication number CN106014500 discloses a kind of steam turbine and debates knowledge and setting method, the party into steam control valve degree of overlapping
Method proposes a series of quantizating index of degrees of overlapping, including regulating valve stepping amplitude, flow linearity and valve point operating condition restriction loss；
And think when violating any of these three indexs, adjusting valve overlap should all be adjusted again.In this way, make regulating valve
Complicated cumbersome, the inefficiency of degree of overlapping work.Therefore, it is necessary to determine to influence from three indexs by further studying
Even determine that the unique constraints condition for adjusting valve overlap adjusting promotes working efficiency to simplify field conduct workload.
According to practical experience, single valve mode (being equivalent to 100% degree of overlapping) and both poles of sequence valve zero lap mode
End situation can be implemented to correct into the linearisation of steam flow amount ideally；That is, the flow linearity that overlapping region is set
It is unrelated with degree of overlapping size, therefore, it is not suitable for as unique constraints condition.It is well known that the valve point under zero lap is transported
Row economy highest, and safety should be placed on economy, therefore, the restriction loss of degree of overlapping background is also not suitable for as unique
Property constraint condition.
Regulating valve idle stroke operation stability and the intrinsic flow behavior of regulating valve (refer to flow characteristics of regulating valve and restriction loss
Characteristic) it is closely bound up, it is also the substantiality safety hidden danger that DEH system faces.After setting stepping safety limit, regulating valve is invalid
The hidden danger that idle stroke unstability is shaken can be readily solved.Meanwhile according to Principles of Steam Turbine, for portion's nested structure and stroke is installed
It is determining into for steam control valve, state parameter of the control valve position as all Steam Turbine regulating valve indispensability in scene has
There are geometric meaning and thermodynamic significance double attribute.
Summary of the invention
The object of the present invention is in order to meet regulating valve overlapping region into vapour flow linearity, DEH system safety operation with
And the demand of valve point operating condition restriction loss is reduced, propose that a kind of DEH system adjusts valve overlap standardization setting method.
Realize that technical scheme is as follows, a kind of DEH system adjusting valve overlap standardization setting method, including build
Vertical DEH system degree of overlapping quantizating index, and valve position measuring device, the side are provided with based on all Steam Turbine regulating valves in scene
Method determines that stepping safety limit in valve position is the uniqueness for influencing to adjust valve overlap adjusting from DEH system degree of overlapping quantizating index
Constraint condition realizes the regulating valve weight being detached from pressure piling degree and close association control valve position according to the constraint condition
Folded degree identification and standardization adjusting.
A kind of DEH system adjusting valve overlap standardization setting method, specifically includes the following steps:
(1) for nozzle governing unit, the degree of overlapping between each regulating valve of sequence valve is removed, completes unit zero lap flow
Attribute testing；For overloading filling unit, the degree of overlapping between homophony valve-filling valve is removed, it is special to complete unit zero lap flow
Property test.
(2) mark each control valve position instruction during zero lap Flow characteristic test real with corresponding steam turbine one by one
Border obtains the actual flow gain curve of single regulating valve into steam flow amount per unit value.
(3) the valve position stepping amplification for calculating back sequence regulating valve under different main valve bit instructions one by one, when the stepping of valve position increases
When width exceeds valve position stepping safety limit, labeled as the overlapping initial position of the valve；Hereafter, it is linear with safety limit to set the valve
It opens, until standard-sized sheet, i.e. overlapping end position；Generated flow gain deficiency is opened to make up preceding valve delay, passes through flow
Characteristic back mapping determines the valve bit instruction of subsequent adjustment valve, to guarantee that overlapping region meets necessary flow linearity；Institute
Valve position stepping safety limit value in 6%~10% range is stated, and takes ceiling value as far as possible；If there is regulating valve pendulum in valve point operating condition
It is dynamic to cause EH oil system oil pressure unstability, it should first check whether the performance of EH oil pump and accumulator meets system requirements, when necessary may be used
The appropriate accumulator quantity that increases is alleviated.
(4) the degree of overlapping setting of other valve point positions is completed one by one according to step (3) for nozzle governing unit；For
Overload matches steam turbine group, only need to complete the setting of the degree of overlapping between homophony valve-filling valve by step (3).
The degree of overlapping quantizating index, including flow linearity, the restriction loss of degree of overlapping background, valve position stepping amplification and valve
Position stepping safety limit.
The flow linearity refers to steam turbine actual flow amplification size corresponding when main valve bit instruction amplification 1%,
A reference value is 1:1.
The degree of overlapping background restriction loss is defined as after setting adjusts valve overlap, the practical valve point operating condition of steam turbine
Heat consumption compares the amplification of ideal " zero lap " valve point operating condition.
The growth of valve position stepping safety limit control valve position instruction corresponding when being main valve bit instruction amplification 1%
Clipping；The safety limit is suitable for the value in 6%~10% range, and takes ceiling value as far as possible.
The valve position stepping safety limit is the core for adjusting valve overlap standardization setting method, safety limit value mistake
It is low, it on the one hand adjusts valve lap starting valve position and accordingly reduces, degree of overlapping background restriction loss is caused to increase；On the other hand, it adjusts
Valve standard-sized sheet is excessively postponed, so that the main valve bit instruction span of overlapping region is excessive, is increased overlapping region and is linearly rectified into steam flow amount
Positive workload；Safety limit value is excessively high, be disadvantageous in that increase that the easy unstability of the invalid idle stroke of regulating valve shakes can
Energy property is advantageous in that adjusting valve lap starting valve position increases accordingly, and can reduce degree of overlapping background restriction loss, zero lap
It is the extreme situation of this situation.
From the point of view of never with the simulation result under safety limit, being increased with safety limit, maximum stream flow deviation has reduction trend,
But it is able to satisfy the necessary flow linearity in overlapping region and under live steam turbine Flow characteristic test precision；Degree of overlapping
Background restriction loss is substantially reduced trend.Meanwhile pressure degree of overlapping is below under 6%~10% valve position stepping safety limit
10%~15% empirical value of hydraulic speed regulation system.It is assumed that safety limit takes 8%, and compared with pressure piling degree takes 10%, two valves
Point and three valve points can reduce restriction loss 72.64kJ (kW.h) respectively-1With 20.05kJ (kW.h)-1.Equally, it is assumed that safety
Clipping takes 8%, in terms of AGC Changing load-acceleration 2%Pe/min, then under 100% nameplate operating condition, control valve position step rate
Substantially 16%/min, i.e. 0.3%/s, under 50% nameplate operating condition, control valve position step rate substantially 32%/min, i.e.,
0.6%/s.According to DL/T 996-2006, itself opening time of oil motor total travel should be not more than 3s, be equivalent to regulating valve stepping
Rate >=33.3%/s；At the scene in regulating valve total travel movement test, DEH system default step rate is 1%~2%/s,
Therefore, the corresponding regulating valve step rate of 8% safety limit is feasible for executing agency.Currently, the stepping of valve position is pacified
Full clipping value is entirely with field experience.According to simulation result, it is proposed that the value in 6%~10% range, and high limit is taken as far as possible；If
There is regulating valve swing and causes EH oil system oil pressure unstability in valve point operating condition, should first check whether the performance of EH oil pump and accumulator is full
Pedal system requirement, can increase accumulator quantity in right amount when necessary and be alleviated.
The invention has the advantages that the present invention proposes that stepping safety limit in valve position is to influence adjusting valve overlap to adjust
Unique constraints condition, according to the condition, the method for the present invention both can guarantee regulating valve overlapping region flow linear smoothing, high pressure tune
There is not large-amplitude sloshing in door, realizes into vapour precise control of flew and speed-regulating system safe operation, and can reduce and adjust valve group overlapping
Region restriction loss gives full play to the power savings advantages of multistep sequence valve control unit valve point operation, can be same type units discharge characteristic
It adjusts work and adjusts valve overlap setting and reference is provided.
The present invention is suitable for DEH system and adjusts valve overlap standardization adjusting.
Detailed description of the invention
It is forward and backward with vapour curve that Fig. 1 is that the degree of overlapping under different safety limits is adjusted；
Fig. 2 is the actual flow gain curve of single regulating valve；
Fig. 3 is zero lap regulating valve stepping amplification under 8% safety limit；
Fig. 4 is that degree of overlapping adjusting is forward and backward into vapour flow deviation simulation result under 8% safety limit；
Fig. 5 is discharge characteristic field demonstration result after degree of overlapping adjusting；
Fig. 6 is the unit heat consumption simulation result that setting degree of overlapping is forward and backward under 8% safety limit；
Fig. 7 is the restriction loss characteristic Simulation result of CV3 regulating valve；
Fig. 8 is the practical restriction loss characteristic field demonstration result of CV3 regulating valve.
Specific embodiment
A kind of DEH system of the embodiment of the present invention adjusts valve overlap standardization setting method, below in conjunction with of the invention real
The attached drawing in example is applied, technical scheme in the embodiment of the invention is clearly and completely described:
By taking certain four valve of 660MW grade supercritical, three step sequence nozzle governing unit (valve sequence is GV1/2 → GV3 → GV4) as an example,
It adjusts valve overlap standardization adjusting, and steps are as follows:
Step 1: for nozzle governing unit, removing the degree of overlapping between each regulating valve of sequence valve, complete unit zero lap
Flow characteristic test；For overloading filling unit, the degree of overlapping between homophony valve-filling valve is removed, unit zero lap stream is completed
Flow characteristic test.
Step 2: mark during zero lap Flow characteristic test one by one the instruction of each control valve position with it is corresponding " with
The steam turbine being worth on the basis of VWO floor data is practical into steam flow amount per unit value ", the actual flow gain for obtaining single regulating valve is bent
Line, as shown in Figure 2.
Step 3: calculating the valve position stepping amplification of back sequence regulating valve under different main valve bit instructions one by one, as shown in Figure 3.
When stepping amplification in valve position exceeds safety limit, labeled as the overlapping initial position of the valve；Hereafter, the valve is set with safety limit
It is linear to open, until standard-sized sheet, i.e. overlapping end position；Generated flow gain deficiency is opened to make up preceding valve delay, is passed through
Discharge characteristic back mapping determines the valve bit instruction of subsequent adjustment valve, to guarantee that it is linear that overlapping region meets necessary flow
Degree, as shown in Figure 1.
Step 4: for nozzle governing unit, according to step 3, completing the degree of overlapping setting of other valve point positions one by one；It is right
Match steam turbine group in overload, only need to complete the setting of the degree of overlapping between homophony valve-filling valve by step 3.By Fig. 4 simulation result it is found that
The present invention overlapping region maximum into vapour flow deviation not Football Association into steam flow amount 0.06%；Meanwhile according to live discharge characteristic
Verification experimental verification as a result, adjusting after discharge characteristic and 1:1 line of reference deviation it is little, meet requirement of engineering precision, as shown in Figure 5.
Fig. 6 is the unit heat consumption simulation result that setting degree of overlapping is forward and backward under 8% safety limit；Fig. 7 and Fig. 8 is respectively unit CV3 tune
Valve is saved under 480MW operating condition with the simulation calculation and field demonstration of the restriction loss characteristic that " unit heat consumption " is evaluation index
As a result.
Table 1 is the simulation result comparison under different safety limits.
Simulation result comparison under the different safety limits of table 1
| Project name | 6% | 8% | 10% |
| Two valve point maximum stream flow deviations/t.h-1 | 0.88 | 0.74 | 0.68 |
| Two valve point restriction losses/kJ. (kWh)-1 | 10.32 | 7.92 | 6.73 |
| Two valve point pressure piling degree/% | 4.69 | 4.13 | 3.95 |
| Three valve point maximum stream flow deviations/t.h-1 | 0.65 | 0.53 | 0.47 |
| Three valve point restriction losses/kJ. (kWh)-1 | 6.81 | 5.33 | 4.42 |
| Three valve point pressure piling degree/% | 6.81 | 5.53 | 4.56 |
Zero lap operating condition charge flow rate under two valve points and three valve points is respectively 1396.96t.h-1And 1775.40t.h-1；Unit heat consumption is respectively 7636.54kJ. (kWh)-1With 7569.09kJ. (kWh)-1；Regulating valve standard-sized sheet pressure difference ratio is respectively
1.40% and 1.59%.
Seen from table 1, it is increased with safety limit, maximum stream flow deviation has reduction trend, but being able to satisfy overlapping region must
The flow linearity wanted and under live steam turbine Flow characteristic test precision；Degree of overlapping background restriction loss has obvious drop
Low tendency, this is consistent with qualitative analysis.Meanwhile pressure degree of overlapping is low under 6%~10% valve position stepping safety limit
In 10%~15% empirical value of hydraulic speed regulation system.It is assumed that safety limit takes 8%, and compared with pressure piling degree takes 10%, two
Valve point and three valve points can reduce restriction loss 72.64kJ (kW.h) respectively-1With 20.05kJ (kW.h)-1.Equally, it is assumed that peace
Full clipping takes 8%, in terms of AGC Changing load-acceleration 2%Pe/min, then under 100% nameplate operating condition, control valve position stepping speed
Rate substantially 16%/min, i.e. 0.3%/s, under 50% nameplate operating condition, control valve position step rate substantially 32%/min,
That is 0.6%/s.According to DL/T 996-2006, itself opening time of oil motor total travel should be not more than 3s, be equivalent to regulating valve step
Into rate >=33.3%/s；At the scene in regulating valve total travel movement test, DEH system default step rate be 1%~2%/
S, therefore, the corresponding regulating valve step rate of 8% safety limit are feasible for executing agency.Currently, the stepping of valve position
Safety limit value is entirely with field experience.According to simulation result, it is proposed that the value in 6%~10% range, and high limit is taken as far as possible；
If regulating valve occurs in valve point operating condition, swing causes EH oil system oil pressure unstability, should first check EH oil pump and accumulator performance whether
Meet system requirements, accumulator quantity can be increased in right amount when necessary and alleviated.
Claims (5)
1. a kind of DEH system adjusts valve overlap standardization setting method, including establishes DEH system degree of overlapping quantizating index,
It is characterized in that, the method determines that stepping safety limit in valve position is to influence regulating valve weight from DEH system degree of overlapping quantizating index
The folded unique constraints condition for spending adjusting is realized and is detached from pressure piling degree and close association adjusting according to the constraint condition
The adjusting valve overlap of valve valve position recognizes and standardization adjusting.
2. a kind of DEH system according to claim 1 adjusts valve overlap standardization setting method, which is characterized in that institute
State method specifically includes the following steps:
(1) for nozzle governing unit, the degree of overlapping between each regulating valve of sequence valve is removed, completes unit zero lap discharge characteristic
Test；For overloading filling unit, the degree of overlapping between homophony valve-filling valve is removed, the examination of unit zero lap discharge characteristic is completed
It tests；
(2) mark one by one during zero lap Flow characteristic test the instruction of each control valve position and corresponding steam turbine actually into
Steam flow amount per unit value obtains the actual flow gain curve of single regulating valve；
(3) the valve position stepping amplification for calculating back sequence regulating valve under different main valve bit instructions one by one, when stepping amplification in valve position is super
Out when valve position stepping safety limit, labeled as the overlapping initial position of the valve；Hereafter, the valve is set linearly to open with safety limit
It opens, until standard-sized sheet, i.e. overlapping end position；Generated flow gain deficiency is opened to make up preceding valve delay, it is special to pass through flow
Property back mapping determines the valve bit instruction of subsequent adjustment valve, to guarantee that overlapping region meets necessary flow linearity；It is described
Valve position stepping safety limit value in 6%~10% range, and ceiling value is taken as far as possible；If regulating valve occurs in valve point operating condition, swing is drawn
EH oil system oil pressure unstability is played, should first check whether the performance of EH oil pump and accumulator meets system requirements, it when necessary can be appropriate
Increase accumulator quantity to be alleviated；
(4) the degree of overlapping setting of other valve point positions is completed one by one according to step (3) for nozzle governing unit；For overload
With steam turbine group, the setting of the degree of overlapping between homophony valve-filling valve only need to be completed by step (3).
3. a kind of DEH system according to claim 1 adjusts valve overlap standardization setting method, which is characterized in that institute
State degree of overlapping quantizating index, including flow linearity, valve position stepping amplification and valve position stepping safety limit and degree of overlapping this coxopodite
Stream loss.
4. a kind of DEH system according to claim 1 adjusts valve overlap standardization setting method, which is characterized in that institute
State the growth clipping of control valve position instruction corresponding when stepping safety limit in valve position is main valve bit instruction amplification 1%；The peace
Full clipping is suitable for the value in 6%~10% range, and takes ceiling value as far as possible, both can guarantee that regulating valve overlapping region flow line is mild-natured
There is not large-amplitude sloshing in sliding, high-pressure governing valve, realizes into vapour precise control of flew and speed-regulating system safe operation, and can reduce adjusting
The restriction loss of valve group overlapping region.
5. a kind of DEH system according to claim 1 adjusts valve overlap standardization setting method, which is characterized in that institute
Stating valve position stepping safety limit is the core for adjusting valve overlap standardization setting method, and safety limit value is too low, on the one hand
It adjusts valve lap starting valve position accordingly to reduce, degree of overlapping background restriction loss is caused to increase；On the other hand, regulating valve standard-sized sheet is excessively
It postpones, so that the main valve bit instruction span of overlapping region is excessive, increases the workload that overlapping region is linearly corrected into steam flow amount；
Safety limit value is excessively high, is disadvantageous in that and increases a possibility that easy unstability of the invalid idle stroke of regulating valve is shaken, it is advantageous it
It is in and is increased accordingly in adjusting valve lap starting valve position, degree of overlapping background restriction loss can be reduced, zero lap is this situation
Extreme situation.
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| CN112145241A (en) * | 2020-09-08 | 2020-12-29 | 国网江西省电力有限公司电力科学研究院 | Flow characteristic fine setting method for multi-sequence valve control mode of steam turbine set |
| CN112989613A (en) * | 2021-03-18 | 2021-06-18 | 南昌科晨电力试验研究有限公司 | Steam turbine set simulation calculation method based on component characteristic parameters |
| CN113341691A (en) * | 2021-05-20 | 2021-09-03 | 中铝中州铝业有限公司 | Steam turbine DEH system setting method |
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| CN112096466A (en) * | 2020-09-22 | 2020-12-18 | 哈电发电设备国家工程研究中心有限公司 | Nozzle-adjustment-based online optimization method for adjusting overlap degree of adjusting valve of steam turbine |
| CN112096466B (en) * | 2020-09-22 | 2022-12-20 | 哈电发电设备国家工程研究中心有限公司 | Nozzle-adjustment-based online optimization method for adjusting overlap degree of adjusting valve of steam turbine |
| CN112989613A (en) * | 2021-03-18 | 2021-06-18 | 南昌科晨电力试验研究有限公司 | Steam turbine set simulation calculation method based on component characteristic parameters |
| CN112989613B (en) * | 2021-03-18 | 2022-11-08 | 南昌科晨电力试验研究有限公司 | Steam turbine set simulation calculation method based on component characteristic parameters |
| CN113341691A (en) * | 2021-05-20 | 2021-09-03 | 中铝中州铝业有限公司 | Steam turbine DEH system setting method |
| CN113341691B (en) * | 2021-05-20 | 2022-08-12 | 中铝中州铝业有限公司 | Steam turbine DEH system setting method |
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