CN104913287B - The control method for preventing superheater from largely intaking in direct current cooker shutdown process - Google Patents
The control method for preventing superheater from largely intaking in direct current cooker shutdown process Download PDFInfo
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- CN104913287B CN104913287B CN201510293996.4A CN201510293996A CN104913287B CN 104913287 B CN104913287 B CN 104913287B CN 201510293996 A CN201510293996 A CN 201510293996A CN 104913287 B CN104913287 B CN 104913287B
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Abstract
The present invention prevents a large amount of control methods intake of superheater in disclosing a kind of direct current cooker shutdown process, comprises the following steps：(1) upstream pressure value and downstream pressure value, the locking pressure value of designated water level regulating valve during the level control valve standard-sized sheet of selection storage tank output end, set steam turbine hydrophobic development unit pressure value, define hygrometric state and dry state operating condition；(2) three below logic is added in the configuration of the scattered control system of generating set, logic one, when under hygrometric state operating condition, when the pressure in the exit that steam-water separator is connected with storage tank inlet tube is more than the first pre-set threshold value, it is too high with the outlet pressure that storage tank inlet tube is connected to send police instruction steam-water separator, then forbid fuel master control refuelling；Logic two, when under hygrometric state operating condition, control high pressure turbine by throws automatic main vapour pressure and is less than or equal to the second pre-set threshold value；Logic three, when under hygrometric state operating condition, before coal pulverizer is started, high pressure turbine by throws automatic main vapour pressure and need to be less than or equal to the 3rd pre-set threshold value.
Description
Technical field
The present invention relates to prevent superheater big in boiler start-up system field, more particularly to a kind of direct current cooker shutdown process
Measure the control method of water inlet.
Background technology
Overcritical, ultra supercritical direct current cooker atmosphere flash-off start-up system working medium flow is as follows：Condenser → condensed water
Pump → condenser clarifier → low-pressure heater → oxygen-eliminating device → direct current cooker feed pump → high-pressure heater → economizer → water
Cold wall → steam-water separator → steam-water separator storage tank → level control valve → condenser is discharged into when water quality is qualified or is worked as
Oxygen-eliminating device is discharged into when water quality is qualified, circulating water outlet is discharged into when water quality is unqualified.Working-medium water is still after direct current cooker is lighted a fire
It is circulated by above-mentioned flow, working substance steam enters low temperature superheater → pendant superheater → height from after steam-water separator separation
Warm superheater.Require that working-medium water enters steam-water separator storage tank → water level regulation from after steam-water separator separation in the process
Valve → condenser or oxygen-eliminating device.This process status is the hygrometric state method of operation of direct current cooker.
From described above, show two kinds of flow directions of working medium in the case of hygrometric state, if there is carbonated drink point in the process
From device pressure more than to a certain degree, only by the risk for having damage after the throttling action decompression of level control valve to hydrophobic development unit,
When the design pressure of thermal power plant steam turbine hydrophobic development unit is 0.2MPa, when the wind for having damage hydrophobic development unit more than this pressure
Danger.The locking pressure of the designated water level regulating valve of science is needed to avoid hydrophobic development unit from being damaged.But, set water level regulation
Can be produced again in operating process after the locking pressure of valve once there is steam-water separator pressure higher than locking pressure, level control valve
Then close, steam water interface forms water directly into steam after steam-water separator storage tank is full of in water-cooling wall
Plug, superheater metal temperature will be raised significantly, can booster when serious.
At present, to the operation of direct current cooker wet-dry state transfer, improved around water level regulation valve blocking pressure mostly, steady
The method of coal realizes quick very hot startup, the safeguard measure without unified standard, with great utilitarian, against electric power
The principle of system requirements " guarantor's body, guarantor's power network, guarantor's equipment ".
Therefore, it is badly in need of wanting preventing the control method that superheater is largely intake come on overcoming in a kind of direct current cooker shutdown process
State the problem of presence.
The content of the invention
It is an object of the invention to provide the controlling party for preventing superheater from largely intaking in a kind of direct current cooker shutdown process
Method, it can protect steam turbine hydrophobic development unit, the superheater system of direct current cooker, and meet power system requirements " guarantor's body, guarantor
The principle of power network, guarantor's equipment ".
To realize above-mentioned purpose, the invention provides preventing superheater from largely intaking in a kind of direct current cooker shutdown process
Control method, comprise the following steps：
(1) level control valve of the storage tank output end of selection direct current cooker upstream pressure value and downstream pressure in standard-sized sheet
Value, sets the locking pressure value of the level control valve, sets the steam turbine hydrophobic development unit pressure value of the direct current cooker, and fixed
The hygrometric state operating condition and dry state operating condition of the justice direct current cooker；
(2) three below logic is added in the configuration of the scattered control system of generating set, until the direct current cooker
The dry state operating condition is switched to by the hygrometric state operating condition,
Logic one, when the direct current cooker be in the hygrometric state operating condition under, the steam-water separator of the direct current cooker
When the pressure in the exit being connected with the storage tank inlet tube is more than the first pre-set threshold value, the direct current cooker sends alarm,
The hypertonia in the exit that the steam-water separator is connected with the storage tank inlet tube is indicated, then forbids fuel master control to add combustion
Material；
Logic two, when the direct current cooker is under the hygrometric state operating condition, control by the high pressure of the direct current cooker
Throw automatic main vapour pressure and be less than or equal to the second pre-set threshold value in road；
Logic three, when the direct current cooker is under the hygrometric state operating condition, starting the coal-grinding of the direct current cooker
Before machine, the high pressure turbine by of the direct current cooker throws automatic main vapour pressure need to be less than or equal to the 3rd pre-set threshold value.
It is preferred that ought meet simultaneously：The evaporation capacity that the burner hearth of the direct current cooker has fire, direct current cooker master control is more than the 4th
Pre-set threshold value, the intermediate point degree of superheat are turned off more than the level control valve of the 5th pre-set threshold value and the storage tank output end
When, define the direct current cooker and be in the dry state operating condition.
It is preferred that the 4th pre-set threshold value is the 25% of the direct current cooker maximum continuous evaporation amount, the described 5th is pre-
If threshold values is 3 DEG C.
It is preferred that obtaining whether the intermediate point degree of superheat exports more than the 5th pre-set threshold value and the storage tank
When whether the level control valve at end is turned off, it was provided with for the first input time delay time；It is in the direct current cooker is defined
Before the dry state operating condition, output delay time is provided with.
It is preferred that ought meet simultaneously：The level control valve of the storage tank output end is opened and intermediate point overheat
When degree is less than six pre-set threshold values, defines the direct current cooker and be in the hygrometric state operating condition.
It is preferred that the 6th pre-set threshold value is 1 DEG C.
It is preferred that the level control valve in the acquisition storage tank output end is opened and the intermediate point degree of superheat is less than
During six pre-set threshold values, it was provided with for the second input time delay time；The hygrometric state operating condition is in the direct current cooker is defined
Before, it is provided with output delay time.
It is preferred that selecting upstream pressure value of the level control valve in standard-sized sheet for 9.42MPa, downstream pressure value is
0.5MPa, sets the locking pressure value 13Mpa of the level control valve；Set the steam turbine hydrophobic development unit pressure value as
0.2MPa。
It is preferred that the level control valve includes the 361 valve A and 361 valve B located at the storage tank output end.
It is preferred that first pre-set threshold value is 12MPa, second pre-set threshold value is 10MPa, the described 3rd default valve
It is 10MPa to be worth.
Compared with prior art, the present invention is by after the hygrometric state operating condition and dry state operating condition for defining direct current cooker,
Three logics are added under hygrometric state operating condition, locking pressure of the steam-water separator pressure higher than level control valve is prevented from,
To prevent level control valve from closing, so as to steam water interface fills in steam-water separator storage tank in the water-cooling wall for avoiding direct current cooker
Directly into formation water plug in steam after full, it is to avoid the contingency of booster occurs, so that in direct current cooker by hygrometric state
During operating condition switchs to dry state operating condition, the steam turbine hydrophobic development unit and superheater system of direct current cooker are protected, made
Obtaining direct current cooker can smoothly switch to dry state operating condition by hygrometric state operating condition, and meet power system requirements " guarantor's body, guarantor
The principle of power network, guarantor's equipment ".Method specification hygrometric state operating condition the turning to dry state operating condition that the present invention is solidified by logic
Change, operation is scientific and reasonable, can eliminate risk.
Brief description of the drawings
Fig. 1 is the flow chart that a large amount of control methods of water inlet of superheater are prevented in direct current cooker shutdown process of the invention.
Fig. 2 is the logic diagram that definition direct current cooker of the invention is in hygrometric state operating condition or dry state operating condition.
Specific embodiment
In order to describe technology contents of the invention, structural feature in detail, below in conjunction with implementation method and coordinate accompanying drawing make into
One step explanation.
Fig. 1 is referred to, the control method 100 for preventing superheater from largely intaking in direct current cooker shutdown process of the invention is wrapped
Include following steps：(S001) level control valve of the storage tank output end of selection direct current cooker upstream pressure value and valve in standard-sized sheet
Pressure value, the locking pressure value of designated water level regulating valve, set the steam turbine hydrophobic development unit pressure value of direct current cooker afterwards, and define
The hygrometric state operating condition and dry state operating condition of direct current cooker.Then the scattered control system of (S002) in generating set is performed
(DCS) three below logic is added in configuration, until direct current cooker switchs to dry state operating condition, logic by hygrometric state operating condition
First, when direct current cooker is under hygrometric state operating condition, the outlet that the steam-water separator of direct current cooker is connected with storage tank inlet tube
When the pressure at place is more than the first pre-set threshold value, direct current cooker sends alarm, indicates steam-water separator to be connected with storage tank inlet tube
Exit hypertonia, then forbid fuel master control refuelling；Logic two, when direct current cooker be in hygrometric state operating condition under,
Control the high pressure turbine by of direct current cooker to throw automatic main vapour pressure and be less than or equal to the second pre-set threshold value；Logic three, work as direct current cooker
Under hygrometric state operating condition, before the coal pulverizer for starting direct current cooker, the high pressure turbine by of direct current cooker throws automatic main vapour pressure
The 3rd pre-set threshold value need to be less than or equal to.That is, the present invention runs work by defining the hygrometric state operating condition and dry state of direct current cooker
After condition, three logics are added under hygrometric state operating condition, be prevented from locking of the steam-water separator pressure higher than level control valve
Pressure, to prevent level control valve from closing, so as to steam water interface is stored up in steam-water separator in the water-cooling wall for avoiding direct current cooker
Water tank be full of after directly into forming water plug in steam, it is to avoid there is the contingency of booster, so as in direct current cooker
During switching to dry state operating condition by hygrometric state operating condition, steam turbine hydrophobic development unit and the superheater system of direct current cooker are protected
System so that direct current cooker can smoothly switch to dry state operating condition by hygrometric state operating condition, and meet power system requirements " guarantor
The principle of body, guarantor's power network, guarantor's equipment ".The present invention runs work by the method specification hygrometric state operating condition that logic solidifies to dry state
The conversion of condition, operation is scientific and reasonable, can eliminate risk.Specifically, it is as follows：
It should be noted that in logic one, when direct current cooker is under hygrometric state operating condition, the steam-water separation of direct current cooker
When the pressure in the exit that device is connected with storage tank inlet tube is more than the first pre-set threshold value, direct current cooker sends alarm, indicates vapour
The hypertonia in the exit that separator is connected with storage tank inlet tube, then forbid fuel master control (FUEL MASTER) plus combustion
Material.This logic limits operator by quick before direct current cooker switchs to dry state operating condition completely by hygrometric state operating condition
Refuelling realizes switching to dry state operating condition completely by hygrometric state operating condition that the working medium that can avoid enter into steam-water separator is
On the one hand water level regulation valve blocking during steam water interface, so remind operator to strengthen intervening in advance, is on the other hand transported in hygrometric state
Before row operating mode is completely converted into dry state operating condition, ensure that level control valve is in adjustment state.
In logic two, when direct current cooker is under hygrometric state operating condition, the high pressure turbine by of direct current cooker is controlled to throw automatic master
Steam pressure is less than or equal to the second pre-set threshold value.This logic limits operator under hygrometric state operating condition by main vapour pressure setting value
What is set is higher, and influence direct current cooker passes through hygrometric state operating condition to the conversion of dry state operating condition under normal circumstances,
Avoid level control valve under hygrometric state operating condition that locking occurs from high pressure turbine by control angle.
In logic three, when direct current cooker is under hygrometric state operating condition, before the coal pulverizer for starting direct current cooker, direct current pot
The high pressure turbine by of stove throws automatic main vapour pressure and need to be less than or equal to the 3rd pre-set threshold value.This logic is added to coal pulverizer entry condition
In, this logic limits operator, and in direct current cooker generation MFT, (MFT refers to the automatic guarantor in the middle of direct current cooker operation to equipment
Shield measure：When abnormal burst accident occurs or alarm, or it is automatically stopped equipment operation；Reservation is sent, air-introduced machine operation is blown
Sweep；When needing starting device after defect or Failure elimination, it is necessary to first by MFT reset can starting device, otherwise motor device cannot
Start；MFT is main fuel trip) after do not carry out enough step-downs and just carry out very hot startup, coal pulverizer is once starting coal-grinding
The coal of depositing of machine blows into hearth combustion, then steam-water separator pressure moment rises to the locking pressure of level control valve, causes water
Steam water interface forms water plug directly into steam in cold wall, and superheater metal temperature will be raised significantly, meeting when serious
Booster.The pressure release of very hot startup direct current cooker is not enough the operating mode that locking most easily occurs in level control valve after direct current cooker MFT, this
It is also the marrow of this logic.
Wherein, meet when simultaneously：The burner hearth of direct current cooker has the evaporation capacity of fire, direct current cooker master control more than the 4th default valve
When value, the intermediate point degree of superheat are turned off more than the level control valve of the 5th pre-set threshold value and storage tank output end, direct current pot is defined
Stove is in dry state operating condition.It is more excellent to be, obtaining whether the intermediate point degree of superheat is more than the 5th pre-set threshold value and institute
When whether the level control valve for stating storage tank output end is turned off, it was provided with for the first input time delay time；Defining direct current
Before boiler is in dry state operating condition, output delay time is provided with such that it is able under the working condition of direct current cooker stabilization,
Obtain more accurate parameter so that whether the judgement in dry state operating condition is more accurate for the direct current cooker of output.Furthermore,
Meet when simultaneously：It is fixed when the level control valve of storage tank output end is opened and the intermediate point degree of superheat is less than six pre-set threshold values
Adopted direct current cooker is in hygrometric state operating condition.It is more excellent to be, the level control valve of the storage tank output end open and in
Between put the degree of superheat be less than six pre-set threshold values when, be provided with for the second input time delay time；Transported in hygrometric state direct current cooker is defined
Before row operating mode, above-mentioned output delay time is provided with such that it is able under the working condition of direct current cooker stabilization, obtain more
Accurate parameter so that whether the judgement in hygrometric state operating condition is more accurate for the direct current cooker of output.It should be noted that
Above-mentioned definition direct current cooker is in the judgement of dry state operating condition or hygrometric state operating condition in direct current cooker by hygrometric state operating condition
During switching to dry state operating condition, the working condition to direct current cooker is detected in real time, to obtain above-mentioned direct current pot
The working status parameter of stove is circulated judgement, until direct current cooker switchs to dry state operating condition by hygrometric state operating condition.
Compared with the superior, level control valve includes the 361 valve A and 361 valve B located at storage tank output end, defeated to meet storage tank
Go out use demand of the end to level control valve, but, it is not limited thereto.
Specifically, logic judgment principle of the direct current cooker in hygrometric state operating condition or dry state operating condition is defined to be preferably
Box Figure 200 as shown in Figure 2, wherein, the first input module 11 output quantity when the burner hearth of direct current cooker has fire is " 1 ",
Otherwise output quantity is " 0 "；Second input module 12 output quantity when the evaporation capacity of direct current cooker master control is more than four pre-set threshold values
It is " 1 " that otherwise output quantity is " 0 "；3rd input module 13 when the intermediate point degree of superheat be more than five pre-set threshold values when output quantity be
" 1 ", otherwise output quantity are " 0 "；4th input module 14 output quantity when 361 valve A are closed is " 1 ", and otherwise output quantity is " 0 "；
5th input module 15 output quantity when 361 valve B are closed is " 1 ", and otherwise output quantity is " 0 "；6th input module 16 is when centre
The point degree of superheat is that output quantity is " 1 " less than the 6th pre-set threshold value, and otherwise output quantity is " 0 "；Logic selecting module 51 works as upper input
End input quantity is " 1 " and lower input input quantity when being " 0 ", and the output quantity of output end is " 1 "；The input of dry state output module 61
Measure during for " 1 ", output defines direct current cooker and is in dry state operating condition；When the input quantity of hygrometric state output module 62 is " 1 ", output
Define direct current cooker and be in hygrometric state operating condition.
With continued reference to Fig. 2, define the box Figure 200 of direct current cooker in hygrometric state operating condition or dry state operating condition
Attachment structure is：4th input module 14 and the input of the 5th input module 15 are all connected to the input of first and door module 21
End, the output end of the 3rd input module 13 and the first input for being all connected to second and door module 22 with the output end of door module 21
End, second is connected to the input of the first input time delay module 31, the first input time delay module 31 with the output end of door module 22
For setting for the first input time delay time, the first input module 11, the second input module 12 and the first input time delay module 31
Output end is all connected to the input of the 3rd and door module 23, and the 3rd is connected to logic selecting module with the output end of door module 23
51 upper input.First input that the first not gate module 41 is also attached to the output end of door module 21, the 6th input mould
The output end of the not gate module 41 of block 16 and first is all connected to the input of the 4th and door module 24, and the 4th is defeated with door module 24
Go out the input that end is connected to the second input time delay module 32, when the second input time delay module 32 is used to set the second input time delay
Between, the output end of the second input time delay module 32 is connected to the lower input for being connected to logic selecting module 51.Logic selecting module
51 output end is connected to the input of output time delay module 33, and output time delay module 33 is used to set output delay time, defeated
The output end for going out time delay module 33 is connected to the input of dry state output module 61；And the output end of output time delay module 33 is also connected with
In the input of the second not gate module 42, the output end of the second not gate module 42 is connected to the input of hygrometric state output module 62.
Then, when the evaporation capacity that the burner hearth of direct current cooker has fire, direct current cooker master control is more than the 4th pre-set threshold value, intermediate point mistake
When temperature is turned off more than the 5th pre-set threshold value and 361 valve A and 361 valve B, the output quantity of logic selecting module 51 is " 1 ", dry state
The input quantity of output module 61 is " 1 ", then output defines direct current cooker and is in dry state operating condition.When 361 valve A and 361 valve B are equal
When unlatching and the intermediate point degree of superheat are less than six pre-set threshold values, the output quantity of logic selecting module 51 is " 0 ", the second not gate module
42 output quantity is " 1 ", and when the input quantity of hygrometric state output module 62 is " 1 ", then output defines direct current cooker and run in hygrometric state
Operating mode.Explanation is needed also exist for, the definition direct current cooker shown in above-mentioned Fig. 2 is in dry state operating condition or hygrometric state operating condition
Box Figure 200 during direct current cooker switchs to dry state operating condition by hygrometric state operating condition, in real time to direct current cooker
Working condition detected, entered according to the box Figure 200 shown in Fig. 2 with obtaining above-mentioned direct current cooker working status parameter
Row cycle criterion, until direct current cooker switchs to dry state operating condition by hygrometric state operating condition.
So as to realize that defining direct current cooker is in hygrometric state operating condition or dry state fortune by the box Figure 200 shown in Fig. 2
Row operating mode.
Selectively, in the present embodiment, upstream pressure value of the selection level control valve in standard-sized sheet is 9.42MPa, valve
Afterwards pressure value be 0.5MPa, the locking pressure value 13Mpa of designated water level regulating valve, set steam turbine hydrophobic development unit pressure value as
0.2MPa；First pre-set threshold value is 12MPa, and the second pre-set threshold value is 10MPa, and the 3rd pre-set threshold value is 10MPa, the 4th default valve
It is direct current cooker maximum continuous evaporation amount (English name to be worth：Boiler maximum continuous rating, English contracting
Write：BMCR) 25%, the 5th pre-set threshold value is 3 DEG C, and the 6th pre-set threshold value is 1 DEG C, the first input time delay module 31 set the
One input time delay time was 120s, and the second input time delay time that the second input time delay module 32 is set is 3s, exports time delay mould
The output delay time that block 33 is set is 180s, and, it should be noted that intermediate point degree of superheat dead band is 1 DEG C.I.e.：Work as direct current
The burner hearth of boiler has fire, the evaporation capacity of direct current cooker master control is more than the 25% of direct current cooker maximum continuous evaporation amount, intermediate point mistake
When temperature is turned off more than 3 DEG C and 361 valve A and 361 valve B, the output quantity of logic selecting module 51 is " 1 ", dry state output module
61 input quantity is " 1 ", then output defines direct current cooker and is in dry state operating condition.When 361 valve A and 361 valve B open and in
Between when putting the degree of superheat and being less than 1 DEG C, the output quantity of logic selecting module 51 is " 0 ", and the output quantity of the second not gate module 42 is " 1 ",
When the input quantity of hygrometric state output module 62 is " 1 ", then output defines direct current cooker and is in hygrometric state operating condition.But not with above-mentioned
The parameter of selected setting is limited, and in other embodiments, can carry out selection setting according to actual working condition, herein
Repeat no more.
The person of being worth noting, the present invention is applicable not only to overcritical, ultra supercritical direct current cooker air expanding type and starts system
Unite come the protection setting for preventing superheater from intaking, can equally be well applied to the hydrophobic heat of overcritical, ultra supercritical direct current cooker band and hand over
Parallel operation activation system and tape starting circulating pump activation system are come the protection setting that prevents superheater from intaking.
Compared with prior art, the present invention is by after the hygrometric state operating condition and dry state operating condition for defining direct current cooker,
Three logics are added under hygrometric state operating condition, locking pressure of the steam-water separator pressure higher than level control valve is prevented from,
To prevent level control valve from closing, so as to steam water interface fills in steam-water separator storage tank in the water-cooling wall for avoiding direct current cooker
Directly into formation water plug in steam after full, it is to avoid the contingency of booster occurs, so that in direct current cooker by hygrometric state
During operating condition switchs to dry state operating condition, the steam turbine hydrophobic development unit and superheater system of direct current cooker are protected, made
Obtaining direct current cooker can smoothly switch to dry state operating condition by hygrometric state operating condition, and meet power system requirements " guarantor's body, guarantor
The principle of power network, guarantor's equipment ".Method specification hygrometric state operating condition the turning to dry state operating condition that the present invention is solidified by logic
Change, operation is scientific and reasonable, can eliminate risk.
Above disclosed is only presently preferred embodiments of the present invention, can not limit the right of the present invention with this certainly
Scope, therefore the equivalent variations made according to the claims in the present invention, still fall within the scope that the present invention is covered.
Claims (10)
1. the control method for preventing superheater from largely intaking in a kind of direct current cooker shutdown process, it is characterised in that including following
Step：
(1) level control valve of the storage tank output end of selection direct current cooker upstream pressure value and downstream pressure value in standard-sized sheet,
The locking pressure value of the level control valve is set, the steam turbine hydrophobic development unit pressure value of the direct current cooker is set, and defined
The hygrometric state operating condition and dry state operating condition of the direct current cooker；
(2) three below logic is added in the configuration of the scattered control system of generating set, until the direct current cooker is by institute
State hygrometric state operating condition and switch to the dry state operating condition,
Logic one, it is under the hygrometric state operating condition when the direct current cooker, the steam-water separator of the direct current cooker and institute
When the pressure for stating the exit of storage tank inlet tube connection is more than the first pre-set threshold value, the direct current cooker sends alarm, indicates
The hypertonia in the exit that the steam-water separator is connected with the storage tank inlet tube, then forbid fuel master control refuelling；
Logic two, when the direct current cooker is under the hygrometric state operating condition, control the high pressure turbine by of the direct current cooker to throw
Automatic main vapour pressure is less than or equal to the second pre-set threshold value；
Logic three, it is under the hygrometric state operating condition when the direct current cooker, before the coal pulverizer for starting the direct current cooker,
The high pressure turbine by of the direct current cooker throws automatic main vapour pressure and need to be less than or equal to the 3rd pre-set threshold value.
2. the control method for preventing superheater from largely intaking in direct current cooker shutdown process as claimed in claim 1, its feature exists
In when while meeting：The burner hearth of the direct current cooker have fire, direct current cooker master control evaporation capacity more than the 4th pre-set threshold value, in
Between when putting the degree of superheat and being turned off more than the level control valve of the 5th pre-set threshold value and the storage tank output end, definition is described
Direct current cooker is in the dry state operating condition.
3. the control method for preventing superheater from largely intaking in direct current cooker shutdown process as claimed in claim 2, its feature exists
In the 4th pre-set threshold value is the 25% of the direct current cooker maximum continuous evaporation amount, and the 5th pre-set threshold value is 3 DEG C.
4. the control method for preventing superheater from largely intaking in direct current cooker shutdown process as claimed in claim 2, its feature exists
In in the acquisition intermediate point degree of superheat whether more than the 5th pre-set threshold value and the water level of the storage tank output end
When whether regulating valve is turned off, it was provided with for the first input time delay time；Run in the dry state the direct current cooker is defined
Before operating mode, output delay time is provided with.
5. the control method for preventing superheater from largely intaking in direct current cooker shutdown process as claimed in claim 1, its feature exists
In when while meeting：The level control valve of the storage tank output end is opened and the intermediate point degree of superheat is pre- less than the 6th
If during threshold values, defining the direct current cooker and being in the hygrometric state operating condition.
6. the control method for preventing superheater from largely intaking in direct current cooker shutdown process as claimed in claim 5, its feature exists
In the 6th pre-set threshold value is 1 DEG C.
7. the control method for preventing superheater from largely intaking in direct current cooker shutdown process as claimed in claim 5, its feature exists
In being opened in the level control valve for obtaining the storage tank output end and the intermediate point degree of superheat be less than the 6th pre-set threshold value
When, it was provided with for the second input time delay time；Before defining the direct current cooker and being in the hygrometric state operating condition, output is provided with
Delay time.
8. the control method for preventing superheater from largely intaking in direct current cooker shutdown process as claimed in claim 1, its feature exists
In it is 9.42MPa to select upstream pressure value of the level control valve in standard-sized sheet, and downstream pressure value is 0.5MPa, sets institute
State the locking pressure value 13Mpa of level control valve；It is 0.2MPa to set the steam turbine hydrophobic development unit pressure value.
9. the control method for preventing superheater from largely intaking in direct current cooker shutdown process as claimed in claim 1, its feature exists
In the level control valve includes the 361 valve A and 361 valve B located at the storage tank output end.
10. the control method for preventing superheater from largely intaking in direct current cooker shutdown process as claimed in claim 1, its feature exists
In first pre-set threshold value is 12MPa, and second pre-set threshold value is 10MPa, and the 3rd pre-set threshold value is 10MPa.
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| CN111650905B (en) * | 2020-05-29 | 2023-04-21 | 内蒙古蒙达发电有限责任公司 | Transformation method of high-pressure bypass control system of thermal power generating unit |
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| US3313111A (en) * | 1965-04-30 | 1967-04-11 | Electrodyne Res Corp | Startup system for a once through steam generator including a startup balancing heatexchanger |
| JP4197667B2 (en) * | 2004-08-17 | 2008-12-17 | 中国電力株式会社 | Preparation method before boiler ignition |
| CN103017133B (en) * | 2012-12-30 | 2016-03-30 | 哈尔滨锅炉厂有限责任公司 | Start-up Systems for Direct-through Boilers with circulating pump and starting method thereof |
| CN103574589B (en) * | 2013-10-31 | 2015-07-22 | 广东电网公司电力科学研究院 | Tube wall overtemperature control method for platen superheater in 1045-megawatt ultra supercritical boiler |
| EP2871336B1 (en) * | 2013-11-06 | 2018-08-08 | General Electric Technology GmbH | Method for managing a shut down of a boiler |
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