CN110500645A - A kind of optimal control method promoting unit bypass heat supply running reliability - Google Patents
A kind of optimal control method promoting unit bypass heat supply running reliability Download PDFInfo
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- CN110500645A CN110500645A CN201910668073.0A CN201910668073A CN110500645A CN 110500645 A CN110500645 A CN 110500645A CN 201910668073 A CN201910668073 A CN 201910668073A CN 110500645 A CN110500645 A CN 110500645A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
- F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
- F24D19/1015—Arrangement or mounting of control or safety devices for water heating systems for central heating using a valve or valves
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Abstract
The present invention relates to fired power generating unit automatic control technology fields, especially a kind of optimal control method for promoting unit bypass heat supply running reliability, it include: when heat supply fired power generating unit is in bypass heat-supplying mode, by the control logic of configuration heat supply fired power generating unit distributed monitoring control system, judge that unit bypasses heating system failure；The size of judgement bypass heating steam flow carries out interlock protection movement in conjunction with unit bypass heating system failure, guarantees the safe and stable operation of unit；Increase and automatically controls logic, the stabilization of control unit bypass heating system operating parameter；The history data and design data for inquiring heat supply fired power generating unit distributed monitoring control system, adjust each automatic control logic parameter.The present invention is able to achieve thermal power plant unit and ensures device security in the case where guaranteeing Heating quality operating condition, and the labor intensity of operations staff, technical level of the control effect independent of operations staff is effectively reduced；Real-time is good, and field adjustable process is simple, is convenient for Project Realization.
Description
Technical field
The present invention relates to fired power generating unit automatic control technology field, especially a kind of promotion unit bypass heat supply running is reliable
The optimal control method of property.
Background technique
The operation characteristic of thermal power plant unit and the method for operation of " electricity determining by heat " limit the regulating power of electricity power output, cause tight
Abandonment/abandoning optical issue of weight.For the digestion capability for improving new energy, National Energy Board proposes development thermoelectricity flexibility transformation bright
Really require, the method for promoting thermoelectricity flexibility is divided into according to unit pattern: cogeneration units carry out thermoelectricity decoupling and reduce peak
Unit output when thermic load, pure condensate unit carry out Transformation of Unit and realize depth peak regulation；It is divided into according to reforming mode: changes outside unit
It makes and the thermal energy such as electric energy consumptions device or heat-accumulator tank such as electric boiler, battery, compressed-air energy storage consumption device is set, inside unit
Transformation progress boiler surely fires, pulverized coal preparation system, boiler circuit, heat power engineering system are transformed.Wherein supplied by the bypath system of unit
Heat is to improve a kind of effective way of thermal power plant unit flexibility, and the regulating power of thermal power plant unit can be significantly increased, pass through unit
Bypath system carry out heat supply after, be related to the safety problem of unit, brought to the bypath system control of unit many tired
Difficulty needs the interlock protection control logic for bypassing heat supply to unit targetedly to be optimized.
Numerous domestic scholars had carried out research and discussion to the bypath system relevant issues of fired power generating unit in recent years, such as
" 100% bypath system is used for the feasibility analysis of 350MW supercritical boiler direct heating " of " Hebei power technology ", introduces
100% bypath system carries out the concrete scheme of boiler direct heating, is above carried out from heating load and system arrangement with conventional capacity bypass
Compare, demonstrates the effect that 100% bypath system plays in boiler direct heating.Chinese patent be " a kind of complete thermoelectricity decoupling
Extraction for heat supply electric power station system and working method " number of patent application CN201710192352.5 is proposed a kind of for resuperheat machine
The modification scheme of group turbine system extraction for heat supply provides extraction for heat supply electric power station system and the work side of a kind of complete thermoelectricity decoupling
Method, which, which can not only accomplish to increase substantially, receives wind-powered electricity generation ability, achievees the purpose that complete thermoelectricity decoupling, and
The heat capacity of unit can be increased substantially.Chinese patent " improves cogeneration units depth peak regulation using unit bypass heat supply
System and method " number of patent application CN201611166629.9 proposes that a kind of utilization unit bypass heat supply improves cogeneration of heat and power machine
Group depth peak regulation system, comprising: boiler, the venthole connection high pressure cylinder of boiler, high pressure cylinder steam discharge are after boiler reheater heats
Intermediate pressure cylinder, intermediate pressure cylinder steam discharge connection low pressure (LP) cylinder are connected, low pressure (LP) cylinder connects condenser, and hp by-pass system connects from major steam line
Out, it is followed by through high pressure bypass valve decompression, desuperheat to the cold Duan Guanlu of reheating, low-pressure bypass system steam by-pass steam turbine mesolow cylinder
It is followed by through the decompression of low voltage bypass valve, desuperheat to condenser, before the other control valve of the height of high pressure cylinder and connects steam extraction pipeline, the extraction steam pipe
Control valve group and reducing-and-cooling plant are provided on line, the steam extraction pipeline is connected to heat exchangers for district heating.
The above document and patent are mainly compared from the arrangement of unit bypath system with conventional capacity bypass, are mentioned
It is directed to the modification scheme of resuperheat power generator turbine system extraction for heat supply out, proposes that improving thermoelectricity using unit bypass heat supply joins
It produces unit depth peak regulation system etc. to be expounded, but does not have to the optimal control for promoting unit bypass heat supply running reliability
Have and is targetedly studied.
Summary of the invention
In order to solve above-mentioned problems of the prior art, the present invention provides a kind of promotion units to bypass heat supply running
The optimal control method of reliability, its purpose is to solve the operational reliability control after heat supply is transformed in thermal power plant unit bypath system
Problem processed takes into account the safety for ensureing equipment, improves the depth peak modulation capacity of unit under the premise of meeting heating demand.
To achieve the goals above, the technical proposal for solving the technical problem of the invention is:
A kind of optimal control method promoting unit bypass heat supply running reliability, includes the following steps:
Step 1: passing through configuration heat supply fired power generating unit scattered control system when heat supply fired power generating unit is in bypass heat-supplying mode
The control logic of DCS judges that unit bypasses heating system failure；
Step 2: the size of judgement bypass heating steam flow, it is dynamic to carry out interlock protection in conjunction with unit bypass heating system failure
Make, guarantees the safe and stable operation of unit；
Logic is automatically controlled step 3: increasing, the stabilization of control unit bypass heating system operating parameter；
Step 4: the history data and design data of inquiry heat supply fired power generating unit distributed monitoring control system, adjusting are each certainly
The parameter of dynamic control logic.
In the first step, it is that Rule of judgment below meets simultaneously that heat supply fired power generating unit, which is in bypass heat-supplying mode,
Include:
(1) opening amount signal, each measured temperature, each pressure measuring value, each flow of each valve of heating system are bypassed
Measured value, unit actual generation power measured value show preferably quality in heat supply fired power generating unit distributed monitoring control system；
(2) unit actual generation power measured value is lower than numerical value A1；
(3) unit operations staff operates bypass heat-supplying mode in heat supply fired power generating unit distributed monitoring control system operation screen and throws
Enter button.
In the first step, the unit bypass heating system failure includes: that height side control valve accidentally closes failure, high other tune
Section valve open by mistake that failure, high other control valve jam faults, low other control valve accidentally close failure, low other control valve opens by mistake therefore
Barrier, low other control valve jam faults, bypass desuperheating water are cut off the water supply failure, heat exchangers for district heating failure.
The numerical value A1 range be 30%Pe to 50% Pe, Pe be rated generation power, numerical value B1 range be 350t/h extremely
450t/h, numerical value B2 range are 450t/h to 550t/h, and numerical value C1 range is 2% to 5%, and numerical value C2 range is 40% to 50%, number
Value C3 range is -2%/s to -1%/s, and numerical value C4 range is -45t/h/s to -40t/h/s, and numerical value D1 range is 55% to 60%, number
Value D2 range is 40% to 50%, and numerical value D3 range is 1%/s to 2%/s, and numerical value D4 range is 40t/h/s to 45t/h/s, numerical value E1
Range is 2% to 5%, and numerical value E2 range is 40% to 50%, and numerical value E3 range is -2%/s to -1%/s, and numerical value E4 range is -50t/
For h/s to -45t/h/s, numerical value F1 range is 55% to 60%, and numerical value F2 range is 40% to 50%, numerical value F3 range be 1%/s to 2%/
S, numerical value F4 range are 45t/h/s to 50 t/h/s, and numerical value G1 range is 15% to 20%, and numerical value G2 range is 15% to 20%, number
The maximum temperature that value H1 can allow for for pipeline material after high other control valve, is 350 DEG C, and numerical value H2 is lower than height side regulating valve
Can allow for 20 DEG C of maximum temperature of pipeline material behind the door are 330 DEG C, and numerical value H4 is that pipeline material can after low other control valve
The maximum temperature of permission is 300 DEG C, and numerical value H5 is lower than the maximum temperature 20 that pipeline material can allow for after low other control valve
DEG C, it is 280 DEG C, numerical value I1 range is 2% to 5%, and numerical value J1 range is 0 second to 200 seconds, and numerical value J2 range is Subcritical Units
17Mpa to 19Mpa, supercritical unit 26Mpa to 27Mpa, numerical value K1 range be 20% to 25%, numerical value L1 range be 1%/min extremely
5%/min, numerical value L2 range are 5%/min to 20%/min.
In the second step, the size for bypassing heating steam flow is judged, comprising the following steps:
(1) when heating steam flow is less than numerical value B1 or low other heating steam flow less than numerical value B2 by height, judge to bypass
Heating steam flow is small；
(2) heating steam flow is more than or equal to numerical value B1 by height or low other heating steam flow is more than or equal to number
When value B2, judge that bypass heating steam flow is big.
In the second step, the size for bypassing heating steam flow is judged, carry out in conjunction with unit bypass heating system failure
Interlock protection movement, step are as follows:
Step 1: when judgement bypass heating steam flow is small, unit bypasses the interlock protection movement after heating system failure occurs
When including: that control valve accidentally closes failure by height, chain unlatching steam turbine reheat control valve door is chain to close low other regulating valve
Door；When control valve opens by mistake failure by height, chain unlatching steam turbine reheat control valve door, if reheat control valve door is complete
It opens, continues starting after low other control valve and low other control valve to condenser electric isolating valve, to maintain high row pressure power to stablize；
When low other control valve accidentally closes failure, chain unlatching steam turbine reheat control valve door, the high other control valve of chain closing, when low
When other control valve opens by mistake failure, chain to close after low other control valve to heat supply network electric isolating valve, the high side of chain closing is adjusted
Valve, to maintain high row pressure power to stablize；When bypass desuperheating water cuts off the water supply failure, control valve and low other regulating valve by height are turned down
Door opens the desuperheating water of big corresponding downstream heating surface；When heat exchangers for district heating failure, the high other control valve of chain closing and low other tune
Save valve；Boiler master is cut to manually by coordinated control system automatically after any of the above-described unit bypass heating system failure occurs
Mode starts simultaneously at timing, if after timing numerical value is greater than J1, main steam pressure is higher than numerical value J2, then triggers unit bypass heat supply
System failure RB, quickly reduces load；
Step 2: when judgement bypass heating steam flow is big, unit bypasses the interlock protection movement after heating system failure occurs
In addition to the interlock protection movement for including above-mentioned judgement bypass heating steam flow hour, further includes: coordinated control system automatically will
Turbine main control is cut to manual mode, chain unlatching boiler pressure control valve PCV, and triggering unit bypasses heating system failure RB；
Step 3: by height when control valve jam faults, being latched low other control valve movement, while warning note operations staff；
When low other control valve jam faults, it is latched high other control valve movement, while warning note operations staff.
It is that Rule of judgment below meets simultaneously that the high other control valve, which accidentally closes failure, comprising:
(1) high other controlling opening of valve is less than numerical value C1；
(2) high other control valve instruction and the difference of aperture are greater than numerical value C2；
(3) high other controlling opening of valve rate of change is greater than numerical value C3；
(4) steam flow rate of change is greater than numerical value C4 after high other control valve；
(5) steam flow quality is non-bad point after high other control valve；
(6) high other controlling opening of valve quality is non-bad point；
(7) electric isolating valve does not close before high other control valve；
The high other control valve opens by mistake failure and is Rule of judgment below while meeting, comprising:
(1) high other controlling opening of valve is greater than numerical value D1；
(2) high other controlling opening of valve and the difference of instruction are greater than numerical value D2；
(3) high other controlling opening of valve rate of change is greater than numerical value D3；
(4) steam flow rate of change is greater than numerical value D4 after high other control valve；
(5) steam flow quality is non-bad point after high other control valve；
(6) high other controlling opening of valve quality is non-bad point；
(7) electric isolating valve does not close before high other control valve；
It is that Rule of judgment below meets simultaneously that the low other control valve, which accidentally closes failure, comprising:
(1) low other controlling opening of valve is less than numerical value E1；
(2) low other control valve instruction and the difference of aperture are greater than numerical value E2；
(3) low other controlling opening of valve rate of change is greater than numerical value E3；
(4) steam flow rate of change is greater than numerical value E4 after low other control valve；
(5) steam flow quality is non-bad point after low other control valve；
(6) low other controlling opening of valve quality is non-bad point；
(7) it is not closed after low other control valve to heat supply network electric isolating valve；
The low other control valve opens by mistake failure and is Rule of judgment below while meeting, comprising:
(1) low other controlling opening of valve is greater than numerical value F1；
(2) low other controlling opening of valve and the difference of instruction are greater than numerical value F2；
(3) low other controlling opening of valve rate of change is greater than numerical value F3；
(4) steam flow rate of change is greater than numerical value F4 after low other control valve；
(5) the non-bad point of steam flow after low other control valve；
(6) the non-bad point of low other controlling opening of valve；
(7) it is not closed after low other control valve to heat supply network electric isolating valve；
The Rule of judgment of the high other control valve jam faults is the absolute value of high other control valve instruction and the difference of aperture
Greater than numerical value G1, the Rule of judgment of low other control valve jam faults instructs absolute with the difference of aperture for low other control valve
Value is greater than numerical value G2；
The bypass desuperheating water cuts off the water supply failure as any satisfaction of Rule of judgment below, comprising:
(1) vapor (steam) temperature quality is good after high other control valve and is greater than numerical value H1；
(2) vapor (steam) temperature quality is good after the other control valve of height and is greater than numerical value H2 and high other pressure of desuperheating water lower than numerical value H3；
(3) vapor (steam) temperature quality is good after low other control valve and is greater than numerical value H4；
(4) vapor (steam) temperature quality is good after low other control valve and is greater than numerical value H5 and low other pressure of desuperheating water lower than numerical value H6；
The high other pressure of desuperheating water is lower than numerical value H3, and forming process is that cold pressure again adds 0.5MPa, low other pressure of desuperheating water
0.5MPa is added lower than numerical value H6 forming process for pressure after low other control valve；
The Rule of judgment of the heat exchangers for district heating failure is to have 2 heat exchangers for district heating admission valve instructions in 4 heat exchangers for district heatings
Numerical value I1 is respectively less than with aperture.
The action process of the unit bypass heating system failure RB are as follows: after unit bypasses heating system failure RB generation,
Fuel master control is cut to manual mode by coordinated control system, while judging whether the quantity of unit operation coal pulverizer is greater than 50% volume
Determine the quantity of generated output, if more than tripping top layer's coal pulverizer instruction is then issued, trip second coal-grinding again after being delayed 10 seconds
Machine, until the quantity of operation coal pulverizer is not more than the quantity of 50% rated generation power.
In the third step: increase and automatically controls logic, the stabilization of control unit bypass heating system primary operating parameter
The step of specifically:
(1) increase the high row pressure power PID regulator of steam turbine reheat control valve door, control the high row pressure power of steam turbine in zone of reasonableness
Interior, the setting value of this PID regulator is high row's pressure low limit setting value, passes through heat supply fired power generating unit by Steam Turhine Adjustment stage pressure
Distributed monitoring control system system is formed after carrying polygronal function f1 (x) operation, and the value of feedback of this PID regulator is high row pressure power
Measured value, shape after the output valve of this PID regulator is added summation with the instruction of original steam turbine reheat control valve door as biasing
It is instructed at final steam turbine reheat control valve door, the range of this PID regulator output valve is-K1 to 0%；
(2) switching rate for increasing high other control valve and low other control valve limits control logic, high other control valve with it is low
The switching rate of other control valve is limited to VARIABLE PARAMETER PID CONTROL, when unit is in bypass heat-supplying mode, the number of this rate limit
Value is L1, and when unit is not in bypass heat-supplying mode, the numerical value of this rate limit is L2；
(3) switching sequence that high other control valve and electric isolating valve before high other control valve are designed in control logic is latched item
Part, electric isolating valve before control valve is first opened by height in guarantee, then opens control valve by height, and high other control valve does not close and do not allow
Open by height electric isolating valve before control valve.
In 4th step: the history data and design data of inquiry heat supply fired power generating unit distributed monitoring control system,
The step of adjusting each parameter for automatically controlling logic specifically:
(1) the history fortune of relevant parameter is inquired in the database of heat supply fired power generating unit distributed monitoring control system history control station
Row data after rejecting abnormalities data, determine the range of the regime values of relevant parameter；
(2) according to the range of the regime values of relevant parameter, in conjunction with design data, determine that the model of abnormal numerical value occurs in relevant parameter
It encloses；
(3) numerical value in each Rule of judgment is determined according to the range of the range of the regime values of relevant parameter and abnormal numerical value.
Advantages of the present invention and beneficial effect are:
(1) when heat supply fired power generating unit is in bypass heat-supplying mode, pass through configuration heat supply fired power generating unit distributed monitoring control system
Control logic judges that unit bypasses heating system failure；The size of judgement bypass heating steam flow, bypasses in conjunction with above-mentioned unit
Heating system failure carries out interlock protection movement, guarantees the safe and stable operation of unit；Increase and automatically controls logic, control bypass
The stabilization of heating system primary operating parameter；It inquires the history data of heat supply fired power generating unit distributed monitoring control system and sets
Meter data adjusts each parameter for automatically controlling logic；Realize that thermal power plant unit ensures equipment under the operating condition for guaranteeing Heating quality
Safety.
(2) labor intensity of operations staff, and technical level of the control effect independent of operations staff be can effectively reduce.
(3) real-time is good, and field adjustable process is simple, is convenient for Project Realization.
Detailed description of the invention
Understand for the ease of those of ordinary skill in the art and implement the present invention, with reference to the accompanying drawing and specific embodiment
The present invention is described in further detail, it is to be understood that protection scope of the present invention is not by the limit of specific embodiment
System.
Fig. 1 is unit bypass heating system failure interlock protection logic chart of the present invention；
Fig. 2 is steam turbine reheat control valve door height row pressure control logic figure of the present invention；
Fig. 3 is workflow block diagram of the present invention.
Specific embodiment
The present invention is a kind of optimal control method of promotion unit bypass heat supply running reliability, as shown in figure 3, Fig. 3 is
Workflow block diagram of the present invention, includes the following steps:
Step 1: passing through configuration heat supply fired power generating unit scattered control system when heat supply fired power generating unit is in bypass heat-supplying mode
The control logic of DCS judges that unit bypasses heating system failure；
Step 2: the size of judgement bypass heating steam flow, it is dynamic to carry out interlock protection in conjunction with unit bypass heating system failure
Make, guarantees the safe and stable operation of unit；
Logic is automatically controlled step 3: increasing, the stabilization of control unit bypass heating system operating parameter；
Step 4: the history data and design data of inquiry heat supply fired power generating unit distributed monitoring control system, adjusting are each certainly
The parameter of dynamic control logic；
In the first step, it is that Rule of judgment below meets simultaneously that heat supply fired power generating unit, which is in bypass heat-supplying mode, comprising:
(1) opening amount signal, each measured temperature, each pressure measuring value, each flow of each valve of heating system are bypassed
Measured value, unit actual generation power measured value show preferably quality in heat supply fired power generating unit distributed monitoring control system；
(2) unit actual generation power measured value is lower than numerical value A1；
(3) unit operations staff operates bypass heat-supplying mode in heat supply fired power generating unit distributed monitoring control system operation screen and throws
Enter button；
In the second step, the size for bypassing heating steam flow is judged, comprising the following steps:
(1) when heating steam flow is less than numerical value B1 or low other heating steam flow less than numerical value B2 by height, judge to bypass
Heating steam flow is small；
(2) heating steam flow is more than or equal to numerical value B1 by height or low other heating steam flow is more than or equal to number
When value B2, judge that bypass heating steam flow is big；
In the first step, unit bypass heating system failure includes: that control valve accidentally closes failure, high other control valve misses by height
Opening failure, high other control valve jam faults, low side control valve, accidentally pass failure, low other control valve open by mistake failure, low other tune
Section valve jam faults, bypass desuperheating water are cut off the water supply failure, heat exchangers for district heating failure；
It is that Rule of judgment below meets simultaneously that the high other control valve, which accidentally closes failure, comprising:
(1) high other controlling opening of valve is less than numerical value C1；
(2) high other control valve instruction and the difference of aperture are greater than numerical value C2；
(3) high other controlling opening of valve rate of change is greater than numerical value C3；
(4) steam flow rate of change is greater than numerical value C4 after high other control valve；
(5) steam flow quality is non-bad point after high other control valve；
(6) high other controlling opening of valve quality is non-bad point；
(7) electric isolating valve does not close before high other control valve；
The high other control valve opens by mistake failure and is Rule of judgment below while meeting, comprising:
(1) high other controlling opening of valve is greater than numerical value D1；
(2) high other controlling opening of valve and the difference of instruction are greater than numerical value D2；
(3) high other controlling opening of valve rate of change is greater than numerical value D3；
(4) steam flow rate of change is greater than numerical value D4 after high other control valve；
(5) steam flow quality is non-bad point after high other control valve；
(6) high other controlling opening of valve quality is non-bad point；
(7) electric isolating valve does not close before high other control valve；
It is that Rule of judgment below meets simultaneously that the low other control valve, which accidentally closes failure, comprising:
(1) low other controlling opening of valve is less than numerical value E1；
(2) low other control valve instruction and the difference of aperture are greater than numerical value E2；
(3) low other controlling opening of valve rate of change is greater than numerical value E3；
(4) steam flow rate of change is greater than numerical value E4 after low other control valve；
(5) steam flow quality is non-bad point after low other control valve；
(6) low other controlling opening of valve quality is non-bad point；
(7) it is not closed after low other control valve to heat supply network electric isolating valve；
The low other control valve opens by mistake failure and is Rule of judgment below while meeting, comprising:
(1) low other controlling opening of valve is greater than numerical value F1；
(2) low other controlling opening of valve and the difference of instruction are greater than numerical value F2；
(3) low other controlling opening of valve rate of change is greater than numerical value F3；
(4) steam flow rate of change is greater than numerical value F4 after low other control valve；
(5) the non-bad point of steam flow after low other control valve；
(6) the non-bad point of low other controlling opening of valve；
(7) it is not closed after low other control valve to heat supply network electric isolating valve；
The Rule of judgment of the high other control valve jam faults is the absolute value of high other control valve instruction and the difference of aperture
Greater than numerical value G1, the Rule of judgment of low other control valve jam faults instructs absolute with the difference of aperture for low other control valve
Value is greater than numerical value G2；
The bypass desuperheating water cuts off the water supply failure as any satisfaction of Rule of judgment below, comprising:
(1) vapor (steam) temperature quality is good after high other control valve and is greater than numerical value H1；
(2) vapor (steam) temperature quality is good after the other control valve of height and is greater than numerical value H2 and high other pressure of desuperheating water lower than numerical value H3；
(3) vapor (steam) temperature quality is good after low other control valve and is greater than numerical value H4；
(4) vapor (steam) temperature quality is good after low other control valve and is greater than numerical value H5 and low other pressure of desuperheating water lower than numerical value H6；
The Rule of judgment of the heat exchangers for district heating failure is to have 2 heat exchangers for district heating admission valve instructions in 4 heat exchangers for district heatings
Numerical value I1 is respectively less than with aperture；
In the second step: the size of judgement bypass heating steam flow is carried out in conjunction with above-mentioned unit bypass heating system failure
The step of interlock protection acts, and guarantees the safe and stable operation of unit specifically:
(1) when judgement bypass heating steam flow is small, unit bypasses the interlock protection after heating system failure occurs and acts packet
Include: when control valve accidentally closes failure by height, chain unlatching steam turbine reheat control valve door is chain to close low other control valve；
When control valve opens by mistake failure by the height, chain unlatching steam turbine reheat control valve door, if reheat control valve door standard-sized sheet, after
To condenser electric isolating valve after the continuous low other control valve of unlatching and low other control valve, to maintain high row pressure power to stablize；When low
When other control valve accidentally closes failure, chain unlatching steam turbine reheat control valve door, the high other control valve of chain closing, when low side is adjusted
Section valve is when opening by mistake failure, chain to close after low other control valve to heat supply network electric isolating valve, the high side control valve of chain closings,
To maintain high row pressure power to stablize；When bypass desuperheating water cuts off the water supply failure, control valve and low other control valve by height are turned down, is opened big
The desuperheating water of corresponding downstream heating surface；When heat exchangers for district heating failure, the high other control valve of chain closing and low other control valve；
Boiler master is cut to manual mode automatically by coordinated control system after any of the above-described unit bypass heating system failure occurs, together
When start timing, if timing numerical value be greater than J1 after, main steam pressure be higher than numerical value J2, then trigger unit bypass heating system failure
RB quickly reduces load；
(2) when judgement bypass heating steam flow is big, the interlock protection movement after unit bypass heating system failure occurs is removed
Interlock protection movement including above-mentioned judgement bypass heating steam flow hour is outer, further includes: coordinated control system is automatically by vapour
Owner's control is cut to manual mode, chain unlatching boiler pressure control valve PCV, and triggering unit bypasses heating system failure RB；
(3) by height when control valve jam faults, low other control valve movement, while warning note operations staff are latched；When
When low other control valve jam faults, it is latched high other control valve movement, while warning note operations staff.
The action process of the unit bypass heating system failure RB are as follows: after unit bypasses heating system failure RB generation,
Fuel master control is cut to manual mode by coordinated control system, while judging whether the quantity of unit operation coal pulverizer is greater than 50% volume
Determine the quantity of generated output, if more than tripping top layer's coal pulverizer instruction is then issued, trip second coal-grinding again after being delayed 10 seconds
Machine, until the quantity of operation coal pulverizer is not more than the quantity of 50% rated generation power.
In the third step: increase and automatically controls logic, the stabilization of control unit bypass heating system primary operating parameter
The step of specifically:
(2) increase the high row pressure power PID regulator of steam turbine reheat control valve door, control the high row pressure power of steam turbine in zone of reasonableness
Interior, the setting value of this PID regulator is high row's pressure low limit setting value, passes through heat supply fired power generating unit by Steam Turhine Adjustment stage pressure
Distributed monitoring control system system is formed after carrying polygronal function f1 (x) operation, and the value of feedback of this PID regulator is high row pressure power
Measured value, shape after the output valve of this PID regulator is added summation with the instruction of original steam turbine reheat control valve door as biasing
It is instructed at final steam turbine reheat control valve door, the range of this PID regulator output valve is-K1 to 0%；
(2) switching rate for increasing high other control valve and low other control valve limits control logic, high other control valve with it is low
The switching rate of other control valve is limited to VARIABLE PARAMETER PID CONTROL, when unit is in bypass heat-supplying mode, the number of this rate limit
Value is L1, and when unit is not in bypass heat-supplying mode, the numerical value of this rate limit is L2；
(3) switching sequence that high other control valve and electric isolating valve before high other control valve are designed in control logic is latched item
Part, electric isolating valve before control valve is first opened by height in guarantee, then opens control valve by height, and high other control valve does not close and do not allow
Open by height electric isolating valve before control valve.
In 4th step: the history data and design data of inquiry heat supply fired power generating unit distributed monitoring control system,
The step of adjusting each parameter for automatically controlling logic specifically:
(2) the history fortune of relevant parameter is inquired in the database of heat supply fired power generating unit distributed monitoring control system history control station
Row data after rejecting abnormalities data, determine the range of the regime values of relevant parameter；
(2) according to the range of the regime values of relevant parameter, in conjunction with design data, determine that the model of abnormal numerical value occurs in relevant parameter
It encloses；
(3) numerical value in each Rule of judgment is determined according to the range of the range of the regime values of relevant parameter and abnormal numerical value；
The specific range of numerical value A1 is 30%Pe to 50% Pe, and Pe is rated generation power, and the specific range of numerical value B1 is 350t/h
To 450t/h, the specific range of numerical value B2 is 450t/h to 550t/h, and the specific range of numerical value C1 is 2% to 5%, the specific range of numerical value C2
It is 40% to 50%, the specific range of numerical value C3 is -2%/s to -1%/s, and the specific range of numerical value C4 is -45t/h/s to -40t/h/s, number
The specific range of value D1 is 55% to 60%, and the specific range of numerical value D2 is 40% to 50%, and the specific range of numerical value D3 is 1%/s to 2%/s, number
The specific range of value D4 be 40t/h/s to 45t/h/s, the specific range of numerical value E1 be 2% to 5%, the specific range of numerical value E2 be 40% to
The specific range of 50%, numerical value E3 is -2%/s to -1%/s, and the specific range of numerical value E4 is -50t/h/s to -45t/h/s, numerical value F1 tool
Body range is 55% to 60%, and the specific range of numerical value F2 is 40% to 50%, and the specific range of numerical value F3 is 1%/s to 2%/s, numerical value F4 tool
Body range is 45t/h/s to 50 t/h/s, and the specific range of numerical value G1 is 15% to 20%, and the specific range of numerical value G2 is 15% to 20%,
Numerical value H1 is the maximum temperature that pipeline material can allow for after high other control valve, generally 350 DEG C, numerical value H2 be lower than height by
Pipeline material can allow for after control valve 20 DEG C of maximum temperature, generally 330 DEG C, numerical value H4 is to manage after control valve by low
The maximum temperature that road material can allow for, generally 300 DEG C, numerical value H5 are that can permit lower than pipeline material after low other control valve
Perhaps 20 DEG C of maximum temperature, generally 280 DEG C, the specific range of numerical value I1 are 2% to 5%, and the specific range of numerical value J1 is 0 second to 200
Second, the specific range of numerical value J2 is Subcritical Units 17Mpa to 19Mpa, supercritical unit 26Mpa to 27Mpa, the specific model of numerical value K1
Enclosing is 20% to 25%, and the specific range of numerical value L1 is 1%/min to 5%/min, and the specific range of numerical value L2 is 5%/min to 20%/min；
The high other pressure of desuperheating water is lower than numerical value H3, and specific forming process is that cold pressure again adds 0.5MPa, low other desuperheating water
Pressure adds 0.5MPa lower than the specific forming process of numerical value H6 for pressure after low other control valve；
Core of the invention thought is to pass through configuration heat supply thermal motor component when heat supply fired power generating unit is in bypass heat-supplying mode
The control logic for dissipating control system DCS judges that unit bypasses heating system failure；The size of judgement bypass heating steam flow,
Interlock protection movement is carried out in conjunction with above-mentioned unit bypass heating system failure, guarantees the safe and stable operation of unit；Increase automatic
Control logic, the stabilization of control bypass heating system primary operating parameter；Inquire heat supply fired power generating unit distributed monitoring control system
History data and design data adjust each parameter for automatically controlling logic；Realize that thermal power plant unit is guaranteeing Heating quality
Operating condition under ensure equipment safety.
Inventive algorithm logic chart, i.e., a kind of system optimizing control for promoting unit bypass heat supply running reliability, unit
Heating system failure interlock protection logic is bypassed as shown in Figure 1, steam turbine reheat control valve door height arranges pressure control logic such as Fig. 2
It is shown.
In Fig. 1, high other control valve accidentally closes failure, high other control valve opens by mistake failure, low other control valve accidentally closes failure,
Low other control valve opens by mistake failure, bypass desuperheating water is cut off the water supply, and failure, heat exchangers for district heating failure, heat supply fired power generating unit are in bypass and supply
Hot mode, bypass heating steam flow are big, are obtained by logic judgment；Main steam pressure is directly from heat supply fired power generating unit decentralised control
It is read in system DCS real-time data base.
In Fig. 2, Steam Turhine Adjustment stage pressure, high row's pressure measuring value, the instruction of original steam turbine reheat control valve door are straight
It connects and is read from heat supply fired power generating unit distributed monitoring control system real-time data base；f1It (x) is heat supply fired power generating unit decentralised control system
DCS system of uniting carries polygronal function, and input is Steam Turhine Adjustment stage pressure, exports as the high row pressure of steam turbine reheat control valve door
Power PID regulator setting value, f1(x) parameter can be according to real-time curve on-line tuning.
Below by taking certain 350MW thermal power plant unit promotes the optimal control of unit bypass heat supply running reliability as an example, introduces and calculate
Method parameter tuning result.
Unit overview: the unit boiler is the HG-1125/25.4-HM2 type of Harbin Boiler Co., Ltd.'s manufacture
Super critical boiler is supercritical pressure, spirally-wound tubes, low NOx DC coal burner, a resuperheat, single burner hearth balance
Ventilation, closed seal, dry ash extraction, the transformation of all steel framework this life Once-through Boiler, pulverized coal preparation system: every boiler matches 5 medium-speed pulverizers
Coal machine, 4 operations, 1 spare；Steam turbine is the NC350-24.2/0.4/ of Beijing Automobile Workshop Bei Chong steam turbine Co., Ltd production
566/556 type is overcritical, resuperheat, twin-cylinder double flow, an extraction-condensing steam turbine；The power generator turbine uses high pressure
Bypass and low voltage bypass two-stage tandem bypath system device, design capacity 40%BMCR, heavy pressure by-pass cooling water be derived from high pressure to
Water, low-pressure by pass temperature-lowering water are derived from condensed water.
The unit rated capacity is 350MW, parameter tuning result are as follows: numerical value A1 is 175MW, and numerical value B1 is 400t/h, number
Value B2 is 500t/h, and numerical value C1 is 5%, and numerical value C2 is 50%, and numerical value C3 is -1%/s, and numerical value C4 is -40t/h/s, and numerical value D1 is
60%, numerical value D2 be 50%, numerical value D3 be 1%/s, numerical value D4 be 40t/h/s, numerical value E1 be 5%, numerical value E2 be 50%, numerical value E3 be-
1%/s, numerical value E4 are -50t/h/s, and numerical value F1 is 60%, and numerical value F2 is 50%, and numerical value F3 is 1%/s, and numerical value F4 is 50 t/h/s,
Numerical value G1 is 20%, and numerical value G2 is 20%, and numerical value H1 is 350 DEG C, and numerical value H2 is 330 DEG C, and numerical value H4 is 300 DEG C, and numerical value H5 is 280
DEG C, numerical value I1 is 5%, and numerical value J1 is 120 seconds, and numerical value J2 is 27Mpa, and numerical value K1 is 20%, and numerical value L1 is 1%/min, and numerical value L2 is
5%/min；
As shown in table 1, table 1 is the high row pressure power PID regulator set value calculation parameter tuning of steam turbine reheat control valve door.
In table 1 with f1(x) corresponding x is Steam Turhine Adjustment stage pressure, complete a kind of promotions unit bypass heat supply running can
By the optimal control method control loop Logical Configuration of property, system is put into actual motion, according to unit operation curve, is existed repeatedly
Line adjusts f1(x) parameter；Field adjustable process is simple, is convenient for Project Realization.
1 heat supply fired power generating unit distributed monitoring control system system of table carries the adjusting of polygronal function f1 (x) control parameter
| x(MPa) | 5.5 | 8.2 | 12.0 | 17.0 | 19.2 |
| f1(x)( MPa) | 1 | 1 | 2.2 | 3.7 | 4.25 |
Claims (10)
1. a kind of optimal control method for promoting unit bypass heat supply running reliability, it is characterized in that: including the following steps:
Step 1: passing through configuration heat supply fired power generating unit scattered control system when heat supply fired power generating unit is in bypass heat-supplying mode
The control logic of DCS judges that unit bypasses heating system failure；
Step 2: the size of judgement bypass heating steam flow, it is dynamic to carry out interlock protection in conjunction with unit bypass heating system failure
Make, guarantees the safe and stable operation of unit；
Logic is automatically controlled step 3: increasing, the stabilization of control unit bypass heating system operating parameter；
Step 4: the history data and design data of inquiry heat supply fired power generating unit distributed monitoring control system, adjusting are each certainly
The parameter of dynamic control logic.
2. a kind of optimal control method for promoting unit bypass heat supply running reliability according to claim 1, feature
Be: in the first step, it is that Rule of judgment below meets simultaneously that heat supply fired power generating unit, which is in bypass heat-supplying mode, comprising:
(1) opening amount signal, each measured temperature, each pressure measuring value, each flow of each valve of heating system are bypassed
Measured value, unit actual generation power measured value show preferably quality in heat supply fired power generating unit distributed monitoring control system；
(2) unit actual generation power measured value is lower than numerical value A1；
(3) unit operations staff operates bypass heat-supplying mode in heat supply fired power generating unit distributed monitoring control system operation screen and throws
Enter button.
3. a kind of optimal control method for promoting unit bypass heat supply running reliability according to claim 1, feature
Be: in the first step, the unit bypass heating system failure includes: that height side control valve accidentally closes failure, high other regulating valve
Door opens by mistake the other control valve jam faults of failure, height, low other control valve accidentally closes failure, low side control valve opens by mistake failure, low
Other control valve jam faults, bypass desuperheating water are cut off the water supply failure, heat exchangers for district heating failure.
4. a kind of optimal control method for promoting unit bypass heat supply running reliability according to claim 2, feature
Be: the numerical value A1 range is 30%Pe to 50% Pe, and Pe is rated generation power, and numerical value B1 range is 350t/h to 450t/h,
Numerical value B2 range is 450t/h to 550t/h, and numerical value C1 range is 2% to 5%, and numerical value C2 range is 40% to 50%, numerical value C3 range
For -2%/s to -1%/s, numerical value C4 range is -45t/h/s to -40t/h/s, and numerical value D1 range is 55% to 60%, numerical value D2 range
It is 40% to 50%, numerical value D3 range is 1%/s to 2%/s, and numerical value D4 range is 40t/h/s to 45t/h/s, and numerical value E1 range is 2%
To 5%, numerical value E2 range is 40% to 50%, and numerical value E3 range is -2%/s to -1%/s, numerical value E4 range be -50t/h/s to -
45t/h/s, numerical value F1 range are 55% to 60%, and numerical value F2 range is 40% to 50%, and numerical value F3 range is 1%/s to 2%/s, numerical value
F4 range is 45t/h/s to 50 t/h/s, and numerical value G1 range is 15% to 20%, and numerical value G2 range is 15% to 20%, and numerical value H1 is
The maximum temperature that pipeline material can allow for after high other control valve, is 350 DEG C, and numerical value H2 is to manage lower than after control valve by height
Material can allow for 20 DEG C of maximum temperature in road are 330 DEG C, and pipeline material can allow for after control valve by numerical value H4 is low
Maximum temperature is 300 DEG C, and numerical value H5 is to be lower than pipeline material can allow for after low other control valve 20 DEG C of maximum temperature
280 DEG C, numerical value I1 range be 2% to 5%, numerical value J1 range be 0 second to 200 seconds, numerical value J2 range be Subcritical Units 17Mpa extremely
19Mpa, supercritical unit 26Mpa to 27Mpa, numerical value K1 range are 20% to 25%, and numerical value L1 range is 1%/min to 5%/min,
Numerical value L2 range is 5%/min to 20%/min.
5. a kind of optimal control method for promoting unit bypass heat supply running reliability according to claim 1, feature
It is: in the second step, judges the size for bypassing heating steam flow, comprising the following steps:
(1) when heating steam flow is less than numerical value B1 or low other heating steam flow less than numerical value B2 by height, judge to bypass
Heating steam flow is small；
(2) heating steam flow is more than or equal to numerical value B1 by height or low other heating steam flow is more than or equal to number
When value B2, judge that bypass heating steam flow is big.
6. a kind of optimal control method for promoting unit bypass heat supply running reliability according to claim 1, feature
It is: in the second step, judges the size for bypassing heating steam flow, carries out chain guarantor in conjunction with unit bypass heating system failure
Shield movement, step are as follows:
Step 1: when judgement bypass heating steam flow is small, unit bypasses the interlock protection movement after heating system failure occurs
When including: that control valve accidentally closes failure by height, chain unlatching steam turbine reheat control valve door is chain to close low other regulating valve
Door；When control valve opens by mistake failure by height, chain unlatching steam turbine reheat control valve door, if reheat control valve door is complete
It opens, continues starting after low other control valve and low other control valve to condenser electric isolating valve, to maintain high row pressure power to stablize；
When low other control valve accidentally closes failure, chain unlatching steam turbine reheat control valve door, the high other control valve of chain closing, when low
When other control valve opens by mistake failure, chain to close after low other control valve to heat supply network electric isolating valve, the high side of chain closing is adjusted
Valve, to maintain high row pressure power to stablize；When bypass desuperheating water cuts off the water supply failure, control valve and low other regulating valve by height are turned down
Door opens the desuperheating water of big corresponding downstream heating surface；When heat exchangers for district heating failure, the high other control valve of chain closing and low other tune
Save valve；Boiler master is cut to manually by coordinated control system automatically after any of the above-described unit bypass heating system failure occurs
Mode starts simultaneously at timing, if after timing numerical value is greater than J1, main steam pressure is higher than numerical value J2, then triggers unit bypass heat supply
System failure RB, quickly reduces load；
Step 2: when judgement bypass heating steam flow is big, unit bypasses the interlock protection movement after heating system failure occurs
In addition to the interlock protection movement for including above-mentioned judgement bypass heating steam flow hour, further includes: coordinated control system automatically will
Turbine main control is cut to manual mode, chain unlatching boiler pressure control valve PCV, and triggering unit bypasses heating system failure RB；
Step 3: by height when control valve jam faults, being latched low other control valve movement, while warning note operations staff；
When low other control valve jam faults, it is latched high other control valve movement, while warning note operations staff.
7. a kind of optimal control method for promoting unit bypass heat supply running reliability according to claim 3, feature
Be: the high other control valve accidentally closes failure and is Rule of judgment below while meeting, comprising:
(1) high other controlling opening of valve is less than numerical value C1；
(2) high other control valve instruction and the difference of aperture are greater than numerical value C2；
(3) high other controlling opening of valve rate of change is greater than numerical value C3；
(4) steam flow rate of change is greater than numerical value C4 after high other control valve；
(5) steam flow quality is non-bad point after high other control valve；
(6) high other controlling opening of valve quality is non-bad point；
(7) electric isolating valve does not close before high other control valve；
The high other control valve opens by mistake failure and is Rule of judgment below while meeting, comprising:
(1) high other controlling opening of valve is greater than numerical value D1；
(2) high other controlling opening of valve and the difference of instruction are greater than numerical value D2；
(3) high other controlling opening of valve rate of change is greater than numerical value D3；
(4) steam flow rate of change is greater than numerical value D4 after high other control valve；
(5) steam flow quality is non-bad point after high other control valve；
(6) high other controlling opening of valve quality is non-bad point；
(7) electric isolating valve does not close before high other control valve；
It is that Rule of judgment below meets simultaneously that the low other control valve, which accidentally closes failure, comprising:
(1) low other controlling opening of valve is less than numerical value E1；
(2) low other control valve instruction and the difference of aperture are greater than numerical value E2；
(3) low other controlling opening of valve rate of change is greater than numerical value E3；
(4) steam flow rate of change is greater than numerical value E4 after low other control valve；
(5) steam flow quality is non-bad point after low other control valve；
(6) low other controlling opening of valve quality is non-bad point；
(7) it is not closed after low other control valve to heat supply network electric isolating valve；
The low other control valve opens by mistake failure and is Rule of judgment below while meeting, comprising:
(1) low other controlling opening of valve is greater than numerical value F1；
(2) low other controlling opening of valve and the difference of instruction are greater than numerical value F2；
(3) low other controlling opening of valve rate of change is greater than numerical value F3；
(4) steam flow rate of change is greater than numerical value F4 after low other control valve；
(5) the non-bad point of steam flow after low other control valve；
(6) the non-bad point of low other controlling opening of valve；
(7) it is not closed after low other control valve to heat supply network electric isolating valve；
The Rule of judgment of the high other control valve jam faults is the absolute value of high other control valve instruction and the difference of aperture
Greater than numerical value G1, the Rule of judgment of low other control valve jam faults instructs absolute with the difference of aperture for low other control valve
Value is greater than numerical value G2；
The bypass desuperheating water cuts off the water supply failure as any satisfaction of Rule of judgment below, comprising:
(1) vapor (steam) temperature quality is good after high other control valve and is greater than numerical value H1；
(2) vapor (steam) temperature quality is good after the other control valve of height and is greater than numerical value H2 and high other pressure of desuperheating water lower than numerical value H3；
(3) vapor (steam) temperature quality is good after low other control valve and is greater than numerical value H4；
(4) vapor (steam) temperature quality is good after low other control valve and is greater than numerical value H5 and low other pressure of desuperheating water lower than numerical value H6；
The high other pressure of desuperheating water is lower than numerical value H3, and forming process is that cold pressure again adds 0.5MPa, low other pressure of desuperheating water
0.5MPa is added lower than numerical value H6 forming process for pressure after low other control valve；
The Rule of judgment of the heat exchangers for district heating failure is to have 2 heat exchangers for district heating admission valve instructions in 4 heat exchangers for district heatings
Numerical value I1 is respectively less than with aperture.
8. a kind of optimal control method for promoting unit bypass heat supply running reliability according to claim 1, feature
It is: the action process of the unit bypass heating system failure RB are as follows: after unit bypasses heating system failure RB generation, coordinate control
Fuel master control is cut to manual mode by system processed, while judging whether the quantity of unit operation coal pulverizer is greater than 50% rated generation
The quantity of power, if more than tripping top layer's coal pulverizer instruction is then issued, trip second coal pulverizer again after being delayed 10 seconds, until
The quantity for running coal pulverizer is not more than the quantity of 50% rated generation power.
9. a kind of optimal control method for promoting unit bypass heat supply running reliability according to claim 1, feature
It is: in the third step: increase and automatically controls logic, the stable step of control unit bypass heating system primary operating parameter
Specifically:
(1) increase the high row pressure power PID regulator of steam turbine reheat control valve door, control the high row pressure power of steam turbine in zone of reasonableness
Interior, the setting value of this PID regulator is high row's pressure low limit setting value, passes through heat supply fired power generating unit by Steam Turhine Adjustment stage pressure
Distributed monitoring control system system is formed after carrying polygronal function f1 (x) operation, and the value of feedback of this PID regulator is high row pressure power
Measured value, shape after the output valve of this PID regulator is added summation with the instruction of original steam turbine reheat control valve door as biasing
It is instructed at final steam turbine reheat control valve door, the range of this PID regulator output valve is-K1 to 0%；
(2) switching rate for increasing high other control valve and low other control valve limits control logic, high other control valve with it is low
The switching rate of other control valve is limited to VARIABLE PARAMETER PID CONTROL, when unit is in bypass heat-supplying mode, the number of this rate limit
Value is L1, and when unit is not in bypass heat-supplying mode, the numerical value of this rate limit is L2；
(3) switching sequence that high other control valve and electric isolating valve before high other control valve are designed in control logic is latched item
Part, electric isolating valve before control valve is first opened by height in guarantee, then opens control valve by height, and high other control valve does not close and do not allow
Open by height electric isolating valve before control valve.
10. a kind of optimal control method for promoting unit bypass heat supply running reliability according to claim 1, feature
It is: in the 4th step: the history data and design data of inquiry heat supply fired power generating unit distributed monitoring control system, adjusting
The step of each parameter for automatically controlling logic specifically:
(1) the history fortune of relevant parameter is inquired in the database of heat supply fired power generating unit distributed monitoring control system history control station
Row data after rejecting abnormalities data, determine the range of the regime values of relevant parameter；
(2) according to the range of the regime values of relevant parameter, in conjunction with design data, determine that the model of abnormal numerical value occurs in relevant parameter
It encloses；
(3) numerical value in each Rule of judgment is determined according to the range of the range of the regime values of relevant parameter and abnormal numerical value.
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| CN114776405A (en) * | 2022-04-11 | 2022-07-22 | 华北电力科学研究院有限责任公司 | Heat supply protection control method and device for cogeneration unit |
| CN114776405B (en) * | 2022-04-11 | 2024-01-26 | 华北电力科学研究院有限责任公司 | Heat supply protection control method and device for cogeneration unit |
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