CN105135415A - Automatic control method for dry state and wet state conversion of supercritical unit - Google Patents
Automatic control method for dry state and wet state conversion of supercritical unit Download PDFInfo
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- CN105135415A CN105135415A CN201510578055.5A CN201510578055A CN105135415A CN 105135415 A CN105135415 A CN 105135415A CN 201510578055 A CN201510578055 A CN 201510578055A CN 105135415 A CN105135415 A CN 105135415A
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Abstract
The invention discloses an automatic control method for dry state and wet state conversion of a supercritical unit. The automatic control method comprises the steps that 1, the unit is operated in a wet state, and the direct-current amount is regulated through feed-water control; 2, when the load of the unit is increased to a control point of converting the wet state into a dry state, feed-water control starts the process of converting the wet state into the dry state through automatic judgment or manual confirmation; 3, the process of converting the wet state into the dry state is completed, the unit is in the dry state operation stage, and feed-water control and intermediate point temperature control are normally regulated; 4, when the load is reduced to a control point of converting the dry state into the wet state, feed-water control starts the process of converting the dry state into the wet state is started through automatic judgment or manual confirmation; 5, the process of converting the dry state into the wet state is completed, the unit is in the wet state operation stage, the water level of a water storage tank meets the condition, then a boiler water circulating pump can be started, and automatic control regulation is performed according to the step 1. According to the automatic control method for dry state and wet state conversion of the supercritical unit, dry state and wet state conversion can be successfully achieved in an automatic control mode for once, the stability of main controlled parameters such as the power and throttle pressure of the unit is further enhanced, and meanwhile the significant advantage of capable of improving the safety and economical efficiency of unit operation are achieved.
Description
One, technical field
The invention belongs to Power Plant Thermal automation field, be a kind ofly both to have avoided doing/alternately the conversion of hygrometric state, effectively can avoid again the control method of boiler water wall generation overtemperatute.
Two, background technology
Due to the significant advantage of supercritical parameter thermal power generation unit in economy, environmental protection, the type machine consists of the object that Ge great electricity power group gives priority to.But, owing to there is no ripe control technology, current supercritical parameter unit dry/hygrometric state conversion adopts manual hand manipulation's mode, cause unit dry/hygrometric state frequently switches, the transition time is long, the water-cooling wall very easily problem such as overtemperature frequently occurs, affects the stable operation of unit.Therefore, a kind of supercritical unit is studied to do/an urgent demand that becomes a reality of control method that hygrometric state is changed automatically.
By method of the present invention, when Logic judgment reach dry/hygrometric state switch condition time, control logic realizes unit automatically to be done/conversion of hygrometric state, the regulated variable of the corresponding automatic adjustment of automatic no-harass switch and setting value; In polling, automatically can adopt dry/hygrometric state conversion and control parameter, ensure the reliable and stable of polling.
At present, to supercritical unit do/research that hygrometric state is changed automatically is still in the starting stage, to the effect that building by carrying out logic in fired power generating unit master control system of our research, realizes supercritical unit to do the/automatic conversion of hygrometric state.This method does not increase the expense of procuring equipment, and realization rate is easy, easy.
The key content of the technological approaches that the present invention is correlated with and enforcement was not all disclosed.
Three, summary of the invention
The object of the invention is: provide a kind of both can avoid doing/alternately the conversion of hygrometric state, can effectively avoid again the supercritical unit of boiler water wall generation overtemperatute dry/hygrometric state switching control method.By increasing control logic in supercritical unit DCS system, realize unit to do the/automatic decision of hygrometric state conversion, the self-adaptative adjustment of dry/hygrometric state transfer process feedwater flow regulation, the Self Adaptive Control of dry/hygrometric state transfer process controling parameters, reduce the artificial workload in polling, avoid doing/frequent the switching of hygrometric state, realize carrying out smoothly of dry/hygrometric state conversion, make the operation stability of unit higher.
The present invention seeks to realize like this, the steps include:
(1) supercritical unit hygrometric state runs, this life of feedwater control and regulation flow
When supercritical unit is in the hygrometric state method of operation, mainly regulate this life of boiler flow to water management, this life flow setting value is directly arranged by artificial.Now, boiler water circulating pump is in running status, and centrum's temperature does not produce the degree of superheat.
To water management regulated variable (F
pV):
F
pV=F
total confluent
Wherein, F
pV-feedwater Control PID regulated variable;
F
total confluent-economizer entrance total Feedwater Flow;
To water management setting value (F
sP):
F
sP=F
manual setting
Wherein, F
sP-feedwater Control PID setting value;
F
manual settingthe manual setting value of-feedwater Control PID;
(2) supercritical unit load rise to hygrometric state become a cadre state control point time, by automatic decision or manual confirmation, start hygrometric state and to become a cadre state process; Hygrometric state is become a cadre in state process, and boiler water circulating pump runs, and the clean feedwater flow of feedwater control and regulation, centrum's temperature controls to set up the degree of superheat
Supercritical unit hygrometric state is become a cadre in state process, be clean feedwater flow to water management regulated variable by this life of boiler traffic transformation, this life flow setting value set manually to water management setting value is converted into feedwater flow instruction corresponding to boiler master instruction and centrum's temperature controls the instruction correction amount sum that feeds water; It is centrum's temperature that centrum's temperature controls regulated variable, and setting value is the saturation temperature and the initial degree of superheat sum through rate limit that intermediate point pressure is corresponding, and the ratio of PID module, integral coefficient are dry/hygrometric state conversion coefficient.
To water management regulated variable (F
pV):
F
pV=F
total confluent-F
quantity of circulating water
Wherein, F
pV-feedwater Control PID regulated variable;
F
total confluent-economizer entrance total Feedwater Flow;
F
quantity of circulating water-boiler water circulating pump discharge;
To water management setting value (F
sP):
F
sP=F
bD+ F
degree of superheat correcting value
Wherein, F
sP-feedwater Control PID setting value;
F
bDthe corresponding feedwater flow instruction of-boiler master instruction;
F
degree of superheat correcting value-centrum's temperature controls feedwater instruction correction amount.
It is centrum's temperature F that centrum's temperature controls regulated variable
iPT-PV.
Centrum's temperature controls setting value F
iPT-SP:
F
iPT-SP=F
iPP+ F
the initial degree of superheat× F
lMT1
Wherein, F
iPT-PV-centrum's temperature Control PID regulated variable;
F
iPT-SP-centrum's temperature Control PID setting value;
F
the initial degree of superheat-centrum's temperature controls the initial degree of superheat of becoming a cadre in state process at hygrometric state;
F
lMT1-hygrometric state is become a cadre the rate limiting function of the initial degree of superheat in state process, and binding hours is according to technique initialization;
F
iPPthe saturation temperature that-intermediate point pressure is corresponding;
Centrum's temperature Control PID parameter:
F
pID-KP=F
dry/hygrometric state conversion KP
F
pID-TI=F
dry/hygrometric state conversion TI
Wherein, F
pID-KP-centrum's temperature Control PID module proportionality coefficient;
F
pID-TI-centrum's temperature Control PID module integral coefficient;
F
dry/hygrometric state conversion KP-centrum's temperature Control PID module does/hygrometric state conversion time proportionality coefficient;
F
dry/hygrometric state conversion TI-centrum's temperature Control PID module does/hygrometric state conversion time integral coefficient;
(3) the supercritical unit centrum's temperature degree of superheat exceedes dry state and judges threshold value and keep after certain hour, and namely unit is in the dry state operation phase; When dry state is run, boiler water circulating pump is stopped transport, the feedwater clean feedwater flow of control and regulation (clean feedwater flow=main feedwater flow), and centrum's temperature controls normal regulating centrum's temperature
The supercritical unit dry state operation phase, be that (boiler water circulating pump discharge is 0 to clean feedwater flow to water management regulated variable, clean feedwater flow=main feedwater flow), be that feedwater flow instruction corresponding to boiler master instruction and centrum's temperature control the instruction correction amount sum that feeds water to water management setting value; It is centrum's temperature that centrum's temperature controls regulated variable, and setting value is the corresponding degree of superheat, the biased three's sum of artificial setting of saturation temperature that intermediate point pressure is corresponding, current loads instruction, and the ratio of PID module, integral coefficient are dry state coefficient;
To water management regulated variable (F
pV):
F
pV=F
total confluent-F
quantity of circulating water
Wherein, F
pV-feedwater Control PID regulated variable;
F
total confluent-economizer entrance total Feedwater Flow;
F
quantity of circulating water-boiler water circulating pump discharge is 0 during dry state;
To water management setting value (F
sP):
F
sP=F
bD+ F
degree of superheat correcting value
Wherein, F
sP-feedwater Control PID setting value;
F
bDthe corresponding feedwater flow instruction of-boiler master instruction;
F
degree of superheat correcting value-centrum's temperature controls feedwater instruction correction amount;
It is centrum's temperature F that centrum's temperature controls regulated variable
iPT-PV;
Centrum's temperature controls setting value F
iPT-SP:
F
iPT-SP=F
iPP+ F
load instruction+ F
artificial biased
Wherein, F
iPT-PV-centrum's temperature Control PID regulated variable;
F
iPT-SP-centrum's temperature Control PID setting value;
F
iPPthe saturation temperature that-intermediate point pressure is corresponding;
F
load instructionthe degree of superheat that the instruction of-current loads is corresponding;
F
artificial biased-artificial the degree of superheat bias correction value arranged;
Centrum's temperature Control PID parameter:
F
pID-KP=F
dry state KP
F
pID-TI=F
dry state TI
Wherein, F
pID-KP-centrum's temperature Control PID module proportionality coefficient;
F
pID-TI-centrum's temperature Control PID module integral coefficient;
F
dry state KPproportionality coefficient when-centrum's temperature Control PID module dry state is run;
F
dry state TIintegral coefficient when-centrum's temperature Control PID module dry state is run;
(4) supercritical unit load is reduced to dry state when turning hygrometric state control point, by automatic decision or manual confirmation, starts dry state and turns hygrometric state process; Dry state turns in hygrometric state process, and boiler water circulating pump is stopped transport, and (when boiler water circulating pump is stopped transport, boiler water circulating pump discharge is 0 to the clean feedwater flow of feedwater control and regulation, clean feedwater flow=main feedwater flow; After transferring hygrometric state to, boiler water circulating pump opens according to condition connection, clean feedwater flow=main feedwater flow-boiler water circulating pump discharge), centrum's temperature controls to gradually reduce the degree of superheat to zero
Supercritical unit dry state turns in hygrometric state process, is that (when boiler water circulating pump is stopped transport, boiler water circulating pump discharge is 0 to clean feedwater flow, clean feedwater flow=main feedwater flow to water management regulated variable; After transferring hygrometric state to, boiler water circulating pump opens according to condition connection, clean feedwater flow=main feedwater flow-boiler water circulating pump discharge), be that feedwater flow instruction corresponding to boiler master instruction and centrum's temperature control the instruction correction amount sum that feeds water to water management setting value; It is centrum's temperature that centrum's temperature controls regulated variable, and setting value is the saturation temperature and zero degree of superheat sum through rate limit that intermediate point pressure is corresponding, and the ratio of PID module, integral coefficient are dry/hygrometric state conversion coefficient;
To water management regulated variable (F
pV):
F
pV=F
total confluent-F
quantity of circulating water
Wherein, F
pV-feedwater Control PID regulated variable;
F
total confluent-economizer entrance total Feedwater Flow;
F
quantity of circulating water-boiler water circulating pump discharge;
To water management setting value (F
sP):
F
sP=F
bD+ F
degree of superheat correcting value
Wherein, F
sP-feedwater Control PID setting value;
F
bDthe corresponding feedwater flow instruction of-boiler master instruction;
F
degree of superheat correcting value-centrum's temperature controls feedwater instruction correction amount;
It is centrum's temperature F that centrum's temperature controls regulated variable
iPT-PV;
Centrum's temperature controls setting value F
iPT-SP:
F
iPT-SP=F
iPP+ F
zero degree of superheat× F
lMT2
Wherein, F
iPT-PV-centrum's temperature Control PID regulated variable;
F
iPT-SP-centrum's temperature Control PID setting value;
F
zero degree of superheat-centrum's temperature controls zero degree of superheat turned in dry state in hygrometric state process;
F
lMT2-dry state turns the rate limiting function of zero degree of superheat in hygrometric state process, and binding hours is according to technique initialization;
F
iPPthe saturation temperature that-intermediate point pressure is corresponding;
Centrum's temperature Control PID parameter:
F
pID-KP=F
dry/hygrometric state conversion KP
F
pID-TI=F
dry/hygrometric state conversion TI
Wherein, F
pID-KP-centrum's temperature Control PID module proportionality coefficient;
F
pID-TI-centrum's temperature Control PID module integral coefficient;
F
dry/hygrometric state conversion KP-centrum's temperature Control PID module does/hygrometric state conversion time proportionality coefficient;
F
dry/hygrometric state conversion TI-centrum's temperature Control PID module does/hygrometric state conversion time integral coefficient;
(5) the centrum's temperature degree of superheat is reduced to hygrometric state and judges threshold value and keep after certain hour, namely unit is in the hygrometric state operation phase, water storage tank water level reaches condition and can join and open boiler water circulating pump, and automatic control and adjustment is carried out according to (one) step
Accompanying drawing explanation
Fig. 1 be supercritical unit of the present invention dry/the automatic conversion logic of hygrometric state judges control block diagram;
Fig. 2 be supercritical unit of the present invention dry/hygrometric state changes centrum's temperature control block diagram automatically;
Fig. 3 be supercritical unit of the present invention dry/hygrometric state changes feedwater flow control block diagram automatically.
Detailed description of the invention
The primary control logic block diagram of the automatic switching control method of the dry hygrometric state of supercritical unit is shown in Fig. 1, Fig. 2 and Fig. 3, and concrete control strategy is as follows:
(1) supercritical unit hygrometric state runs, this life of feedwater control and regulation flow
When supercritical unit is in the hygrometric state method of operation, mainly regulate this life of boiler flow to water management, this life flow setting value is directly arranged by artificial; Now, boiler water circulating pump is in running status, and centrum's temperature does not produce the degree of superheat;
To water management regulated variable (F
pV):
F
pV=F
total confluent
Wherein, F
pV-feedwater Control PID regulated variable;
F
total confluent-economizer entrance total Feedwater Flow;
To water management setting value (F
sP):
F
sP=F
manual setting
Wherein, F
sP-feedwater Control PID setting value;
F
manual settingthe manual setting value of-feedwater Control PID;
(2) supercritical unit load rise to hygrometric state become a cadre state control point time, by automatic decision or manual confirmation, start hygrometric state and to become a cadre state process; Hygrometric state is become a cadre in state process, and boiler water circulating pump runs, and the clean feedwater flow of feedwater control and regulation, centrum's temperature controls to set up the degree of superheat
Supercritical unit hygrometric state is become a cadre in state process, be clean feedwater flow to water management regulated variable by this life of boiler traffic transformation, this life flow setting value set manually to water management setting value is converted into feedwater flow instruction corresponding to boiler master instruction and centrum's temperature controls the instruction correction amount sum that feeds water; It is centrum's temperature that centrum's temperature controls regulated variable, and setting value is the saturation temperature and the initial degree of superheat sum through rate limit that intermediate point pressure is corresponding, and the ratio of PID module, integral coefficient are dry/hygrometric state conversion coefficient;
To water management regulated variable (F
pV):
F
pV=F
total confluent-F
quantity of circulating water
Wherein, F
pV-feedwater Control PID regulated variable;
F
total confluent-economizer entrance total Feedwater Flow;
F
quantity of circulating water-boiler water circulating pump discharge;
To water management setting value (F
sP):
F
sP=F
bD+ F
degree of superheat correcting value
Wherein, F
sP-feedwater Control PID setting value;
F
bDthe corresponding feedwater flow instruction of-boiler master instruction;
F
degree of superheat correcting value-centrum's temperature controls feedwater instruction correction amount.
It is centrum's temperature F that centrum's temperature controls regulated variable
iPT-PV.
Centrum's temperature controls setting value F
iPT-SP:
F
iPT-SP=F
iPP+ F
the initial degree of superheat× F
lMT1
Wherein, F
iPT-PV-centrum's temperature Control PID regulated variable;
F
iPT-SP-centrum's temperature Control PID setting value;
F
the initial degree of superheat-centrum's temperature controls the initial degree of superheat of becoming a cadre in state process at hygrometric state;
F
lMT1-hygrometric state is become a cadre the rate limiting function of the initial degree of superheat in state process, and binding hours is according to technique initialization;
F
iPPthe saturation temperature that-intermediate point pressure is corresponding.
Centrum's temperature Control PID parameter:
F
pID-KP=F
dry/hygrometric state conversion KP
F
pID-TI=F
dry/hygrometric state conversion TI
Wherein, F
pID-KP-centrum's temperature Control PID module proportionality coefficient;
F
pID-TI-centrum's temperature Control PID module integral coefficient;
F
dry/hygrometric state conversion KP-centrum's temperature Control PID module does/hygrometric state conversion time proportionality coefficient;
F
dry/hygrometric state conversion TI-centrum's temperature Control PID module does/hygrometric state conversion time integral coefficient.
(3) the supercritical unit centrum's temperature degree of superheat exceedes dry state and judges threshold value and keep after certain hour, and namely unit is in the dry state operation phase; When dry state is run, boiler water circulating pump is stopped transport, the feedwater clean feedwater flow of control and regulation (clean feedwater flow=main feedwater flow), and centrum's temperature controls normal regulating centrum's temperature
The supercritical unit dry state operation phase, be that (boiler water circulating pump discharge is 0 to clean feedwater flow to water management regulated variable, clean feedwater flow=main feedwater flow), be that feedwater flow instruction corresponding to boiler master instruction and centrum's temperature control the instruction correction amount sum that feeds water to water management setting value; It is centrum's temperature that centrum's temperature controls regulated variable, and setting value is the corresponding degree of superheat, the biased three's sum of artificial setting of saturation temperature that intermediate point pressure is corresponding, current loads instruction, and the ratio of PID module, integral coefficient are dry state coefficient;
To water management regulated variable (F
pV):
F
pV=F
total confluent-F
quantity of circulating water
Wherein, F
pV-feedwater Control PID regulated variable;
F
total confluent-economizer entrance total Feedwater Flow;
F
quantity of circulating water-boiler water circulating pump discharge is 0 during dry state;
To water management setting value (F
sP):
F
sP=F
bD+ F
degree of superheat correcting value
Wherein, F
sP-feedwater Control PID setting value;
F
bDthe corresponding feedwater flow instruction of-boiler master instruction;
F
degree of superheat correcting value-centrum's temperature controls feedwater instruction correction amount.
It is centrum's temperature F that centrum's temperature controls regulated variable
iPT-PV;
Centrum's temperature controls setting value F
iPT-SP:
F
iPT-SP=F
iPP+ F
load instruction+ F
artificial biased
Wherein, F
iPT-PV-centrum's temperature Control PID regulated variable;
F
iPT-SP-centrum's temperature Control PID setting value;
F
iPPthe saturation temperature that-intermediate point pressure is corresponding;
F
load instructionthe degree of superheat that the instruction of-current loads is corresponding;
F
artificial biased-artificial the degree of superheat bias correction value arranged;
Centrum's temperature Control PID parameter:
F
pID-KP=F
dry state KP
F
pID-TI=F
dry state TI
Wherein, F
pID-KP-centrum's temperature Control PID module proportionality coefficient;
F
pID-TI-centrum's temperature Control PID module integral coefficient;
F
dry state KPproportionality coefficient when-centrum's temperature Control PID module dry state is run;
F
dry state TIintegral coefficient when-centrum's temperature Control PID module dry state is run;
(4) supercritical unit load is reduced to dry state when turning hygrometric state control point, by automatic decision or manual confirmation, starts dry state and turns hygrometric state process; Dry state turns in hygrometric state process, and boiler water circulating pump is stopped transport, and (when boiler water circulating pump is stopped transport, boiler water circulating pump discharge is 0 to the clean feedwater flow of feedwater control and regulation, clean feedwater flow=main feedwater flow; After transferring hygrometric state to, boiler water circulating pump opens according to condition connection, clean feedwater flow=main feedwater flow-boiler water circulating pump discharge), centrum's temperature controls to gradually reduce the degree of superheat to zero
Supercritical unit dry state turns in hygrometric state process, is that (when boiler water circulating pump is stopped transport, boiler water circulating pump discharge is 0 to clean feedwater flow, clean feedwater flow=main feedwater flow to water management regulated variable; After transferring hygrometric state to, boiler water circulating pump opens according to condition connection, clean feedwater flow=main feedwater flow-boiler water circulating pump discharge), be that feedwater flow instruction corresponding to boiler master instruction and centrum's temperature control the instruction correction amount sum that feeds water to water management setting value; It is centrum's temperature that centrum's temperature controls regulated variable, and setting value is the saturation temperature and zero degree of superheat sum through rate limit that intermediate point pressure is corresponding, and the ratio of PID module, integral coefficient are dry/hygrometric state conversion coefficient;
To water management regulated variable (F
pV):
F
pV=F
total confluent-F
quantity of circulating water
Wherein, F
pV-feedwater Control PID regulated variable;
F
total confluent-economizer entrance total Feedwater Flow;
F
quantity of circulating water-boiler water circulating pump discharge;
To water management setting value (F
sP):
F
sP=F
bD+ F
degree of superheat correcting value
Wherein, F
sP-feedwater Control PID setting value;
F
bDthe corresponding feedwater flow instruction of-boiler master instruction;
F
degree of superheat correcting value-centrum's temperature controls feedwater instruction correction amount;
It is centrum's temperature F that centrum's temperature controls regulated variable
iPT-PV;
Centrum's temperature controls setting value F
iPT-SP:
F
iPT-SP=F
iPP+ F
zero degree of superheat× F
lMT2
Wherein, F
iPT-PV-centrum's temperature Control PID regulated variable;
F
iPT-SP-centrum's temperature Control PID setting value;
F
zero degree of superheat-centrum's temperature controls zero degree of superheat turned in dry state in hygrometric state process;
F
lMT2-dry state turns the rate limiting function of zero degree of superheat in hygrometric state process, and binding hours is according to technique initialization;
F
iPPthe saturation temperature that-intermediate point pressure is corresponding;
Centrum's temperature Control PID parameter:
F
pID-KP=F
dry/hygrometric state conversion KP
F
pID-TI=F
dry/hygrometric state conversion TI
Wherein, F
pID-KP-centrum's temperature Control PID module proportionality coefficient;
F
pID-TI-centrum's temperature Control PID module integral coefficient;
F
dry/hygrometric state conversion KP-centrum's temperature Control PID module does/hygrometric state conversion time proportionality coefficient;
F
dry/hygrometric state conversion TI-centrum's temperature Control PID module does/hygrometric state conversion time integral coefficient;
(5) the centrum's temperature degree of superheat is reduced to hygrometric state and judges threshold value and keep after certain hour, namely unit is in the hygrometric state operation phase, water storage tank water level reaches condition and can join and open boiler water circulating pump, and automatic control and adjustment is carried out according to (one) step.
The platform that the present invention's " automatic switching control method of the dry hygrometric state of a kind of supercritical unit " implements is the master control system of fired power generating unit.In the master control system of unit, carry out the control logic configuration of the automatic switching control method of the dry hygrometric state of supercritical unit, realize following controlling functions:
(1) increase supercritical unit and do/the decision logic of hygrometric state transfer point
Increase in control logic and start hygrometric state and to become a cadre the Rule of judgment of state process:
1) unit load is greater than " hygrometric state become a cadre state " Logic judgment threshold value
2) master control is fed water at auto state
3) unit is in the hygrometric state method of operation
In control logic, increase beginning dry state turn hygrometric state process Rule of judgment:
1) unit load is less than " dry state turns hygrometric state " Logic judgment threshold value
2) master control is fed water at auto state
3) centrum's temperature controls at auto state
4) unit is in the dry state method of operation
(2) dry/hygrometric state transfer process feedwater Control PID regulated variable switch logic is increased
1), when unit is in the hygrometric state method of operation, unit feedwater Control PID regulated variable is main feedwater flow;
2) unit in dry/hygrometric state transfer process and the dry state method of operation time, unit feedwater Control PID regulated variable is that main feedwater flow subtracts boiler water circulating pump discharge.
(3) dry/hygrometric state transfer process centrum's temperature degree of superheat setting value switch logic is increased
1) hygrometric state is become a cadre in state process, and the centrum's temperature degree of superheat is set as the initial degree of superheat, and through rate limit;
2) dry state turns in hygrometric state process, and the centrum's temperature degree of superheat is set as zero degree of superheat, and through rate limit.
(4) dry/hygrometric state transfer process centrum's temperature Control PID proportionality coefficient, integral coefficient switch logic is increased
1), in dry state process, the ratio of centrum's temperature Control PID module, integral coefficient are dry state operating factor;
2) dry state turns hygrometric state process, hygrometric state becomes a cadre in state process, and the ratio of centrum's temperature Control PID module, integral coefficient are dry/hygrometric state conversion coefficient.
Claims (1)
1. the automatic switching control method of the dry hygrometric state of supercritical unit, is characterized in that, comprise the following steps:
(1) supercritical unit hygrometric state runs, this life of feedwater control and regulation flow
When supercritical unit is in the hygrometric state method of operation, mainly regulate this life of boiler flow to water management, this life flow setting value is directly arranged by artificial; Now, boiler water circulating pump is in running status, and centrum's temperature does not produce the degree of superheat;
To water management regulated variable (F
pV):
F
pV=F
total confluent
Wherein, F
pV-feedwater Control PID regulated variable;
F
total confluent-economizer entrance total Feedwater Flow;
To water management setting value (F
sP):
F
sP=F
manual setting
Wherein, F
sP-feedwater Control PID setting value;
F
manual settingthe manual setting value of-feedwater Control PID;
(2) supercritical unit load rise to hygrometric state become a cadre state control point time, by automatic decision or manual confirmation, start hygrometric state and to become a cadre state process; Hygrometric state is become a cadre in state process, and boiler water circulating pump runs, the clean feedwater flow of feedwater control and regulation, and centrum's temperature controls to set up the degree of superheat;
Supercritical unit hygrometric state is become a cadre in state process, be clean feedwater flow to water management regulated variable by this life of boiler traffic transformation, this life flow setting value set manually to water management setting value is converted into feedwater flow instruction corresponding to boiler master instruction and centrum's temperature controls the instruction correction amount sum that feeds water; It is centrum's temperature that centrum's temperature controls regulated variable, and setting value is the saturation temperature and the initial degree of superheat sum through rate limit that intermediate point pressure is corresponding, and the ratio of PID module, integral coefficient are dry/hygrometric state conversion coefficient;
To water management regulated variable (F
pV):
F
pV=F
total confluent-F
quantity of circulating water
Wherein, F
pV-feedwater Control PID regulated variable;
F
total confluent-economizer entrance total Feedwater Flow;
F
quantity of circulating water-boiler water circulating pump discharge;
To water management setting value (F
sP):
F
sP=F
bD+ F
degree of superheat correcting value
Wherein, F
sP-feedwater Control PID setting value;
F
bDthe corresponding feedwater flow instruction of-boiler master instruction;
F
degree of superheat correcting value-centrum's temperature controls feedwater instruction correction amount;
It is centrum's temperature F that centrum's temperature controls regulated variable
iPT-PV;
Centrum's temperature controls setting value F
iPT-SP:
F
iPT-SP=F
iPP+ F
the initial degree of superheat× F
lMT1
Wherein, F
iPT-PV-centrum's temperature Control PID regulated variable;
F
iPT-SP-centrum's temperature Control PID setting value;
F
the initial degree of superheat-centrum's temperature controls the initial degree of superheat of becoming a cadre in state process at hygrometric state;
F
lMT1-hygrometric state is become a cadre the rate limiting function of the initial degree of superheat in state process, and binding hours is according to technique initialization;
F
iPPthe saturation temperature that-intermediate point pressure is corresponding;
Centrum's temperature Control PID parameter:
F
pID-KP=F
dry/hygrometric state conversion KP
F
pID-TI=F
dry/hygrometric state conversion TI
Wherein, F
pID-KP-centrum's temperature Control PID module proportionality coefficient;
F
pID-TI-centrum's temperature Control PID module integral coefficient;
F
dry/hygrometric state conversion KP-centrum's temperature Control PID module does/hygrometric state conversion time proportionality coefficient;
F
dry/hygrometric state conversion TI-centrum's temperature Control PID module does/hygrometric state conversion time integral coefficient;
(3) the supercritical unit centrum's temperature degree of superheat exceedes dry state and judges threshold value and keep after certain hour, and namely unit is in the dry state operation phase; When dry state is run, boiler water circulating pump is stopped transport, the feedwater clean feedwater flow of control and regulation (clean feedwater flow=main feedwater flow), and centrum's temperature controls normal regulating centrum's temperature;
The supercritical unit dry state operation phase is clean feedwater flow to water management regulated variable, is that feedwater flow instruction corresponding to boiler master instruction and centrum's temperature control the instruction correction amount sum that feeds water to water management setting value; It is centrum's temperature that centrum's temperature controls regulated variable, and setting value is the corresponding degree of superheat, the biased three's sum of artificial setting of saturation temperature that intermediate point pressure is corresponding, current loads instruction, and the ratio of PID module, integral coefficient are dry state coefficient;
To water management regulated variable (F
pV):
F
pV=F
total confluent-F
quantity of circulating water
Wherein, F
pV-feedwater Control PID regulated variable;
F
total confluent-economizer entrance total Feedwater Flow;
F
quantity of circulating water-boiler water circulating pump discharge is 0 during dry state;
To water management setting value (F
sP):
F
sP=F
bD+ F
degree of superheat correcting value
Wherein, F
sP-feedwater Control PID setting value;
F
bDthe corresponding feedwater flow instruction of-boiler master instruction;
F
degree of superheat correcting value-centrum's temperature controls feedwater instruction correction amount;
It is centrum's temperature F that centrum's temperature controls regulated variable
iPT-PV;
Centrum's temperature controls setting value F
iPT-SP:
F
iPT-SP=F
iPP+ F
load instruction+ F
artificial biasedwherein, F
iPT-PV-centrum's temperature Control PID regulated variable;
F
iPT-SP-centrum's temperature Control PID setting value;
F
iPPthe saturation temperature that-intermediate point pressure is corresponding;
F
load instructionthe degree of superheat that the instruction of-current loads is corresponding;
F
artificial biased-artificial the degree of superheat bias correction value arranged;
Centrum's temperature Control PID parameter:
F
pID-KP=F
dry state KP
F
pID-TI=F
dry state TI
Wherein, F
pID-KP-centrum's temperature Control PID module proportionality coefficient;
F
pID-TI-centrum's temperature Control PID module integral coefficient;
F
dry state KPproportionality coefficient when-centrum's temperature Control PID module dry state is run;
F
dry state TIintegral coefficient when-centrum's temperature Control PID module dry state is run;
(4) supercritical unit load is reduced to dry state when turning hygrometric state control point, by automatic decision or manual confirmation, starts dry state and turns hygrometric state process; Dry state turns in hygrometric state process, and boiler water circulating pump is stopped transport, the clean feedwater flow of feedwater control and regulation, and centrum's temperature controls to gradually reduce the degree of superheat to zero;
Supercritical unit dry state turns in hygrometric state process, is clean feedwater flow to water management regulated variable, is that feedwater flow instruction corresponding to boiler master instruction and centrum's temperature control the instruction correction amount sum that feeds water to water management setting value; It is centrum's temperature that centrum's temperature controls regulated variable, and setting value is the saturation temperature and zero degree of superheat sum through rate limit that intermediate point pressure is corresponding, and the ratio of PID module, integral coefficient are dry/hygrometric state conversion coefficient;
To water management regulated variable (F
pV):
F
pV=F
total confluent-F
quantity of circulating water
Wherein, F
pV-feedwater Control PID regulated variable;
F
total confluent-economizer entrance total Feedwater Flow;
F
quantity of circulating water-boiler water circulating pump discharge, it is 0 that dry state turns in hygrometric state process;
To water management setting value (F
sP):
F
sP=F
bD+ F
degree of superheat correcting value
Wherein, F
sP-feedwater Control PID setting value;
F
bDthe corresponding feedwater flow instruction of-boiler master instruction;
F
degree of superheat correcting value-centrum's temperature controls feedwater instruction correction amount;
It is centrum's temperature F that centrum's temperature controls regulated variable
iPT-PV;
Centrum's temperature controls setting value F
iPT-SP:
F
iPT-SP=F
iPP+ F
zero degree of superheat× F
lMT2
Wherein, F
iPT-PV-centrum's temperature Control PID regulated variable;
F
iPT-SP-centrum's temperature Control PID setting value;
F
zero degree of superheat-centrum's temperature controls zero degree of superheat turned in dry state in hygrometric state process;
F
lMT2-dry state turns the rate limiting function of zero degree of superheat in hygrometric state process, and binding hours is according to technique initialization;
F
iPPthe saturation temperature that-intermediate point pressure is corresponding;
Centrum's temperature Control PID parameter:
F
pID-KP=F
dry/hygrometric state conversion KP
F
pID-TI=F
dry/hygrometric state conversion TI
Wherein, F
pID-KP-centrum's temperature Control PID module proportionality coefficient;
F
pID-TI-centrum's temperature Control PID module integral coefficient;
F
dry/hygrometric state conversion KP-centrum's temperature Control PID module does/hygrometric state conversion time proportionality coefficient;
F
dry/hygrometric state conversion TI-centrum's temperature Control PID module does/hygrometric state conversion time integral coefficient;
(5) the centrum's temperature degree of superheat is reduced to hygrometric state and judges threshold value and keep after certain hour, namely unit is in the hygrometric state operation phase, water storage tank water level reaches condition and can join and open boiler water circulating pump, and automatic control and adjustment is carried out according to (one) step.
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| CN106439770A (en) * | 2016-09-20 | 2017-02-22 | 广东电网有限责任公司电力科学研究院 | Control method for steam temperature of meager coal boiler of 1045MW ultra supercritical unit |
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| CN109253442A (en) * | 2018-09-12 | 2019-01-22 | 国电南京电力试验研究有限公司 | One kind is become a cadre state control method |
| CN110966589B (en) * | 2019-12-04 | 2021-08-03 | 国网浙江省电力有限公司电力科学研究院 | Bypass system for reducing dry-wet critical load point of supercritical unit and operation method |
| CN110966589A (en) * | 2019-12-04 | 2020-04-07 | 国网浙江省电力有限公司电力科学研究院 | Bypass system for reducing dry-wet critical load point of supercritical unit and operation method |
| CN111473316A (en) * | 2020-04-09 | 2020-07-31 | 中国能源建设集团西北电力试验研究院有限公司 | Dry-state to wet-state control method for ultra-supercritical unit with furnace water circulating pump |
| CN111473316B (en) * | 2020-04-09 | 2022-04-15 | 中国能源建设集团西北电力试验研究院有限公司 | Dry-state to wet-state control method for ultra-supercritical unit with furnace water circulating pump |
| CN111637443A (en) * | 2020-06-19 | 2020-09-08 | 辽宁东科电力有限公司 | One-key whole-course automatic control method for water supply of supercritical once-through boiler |
| CN111637443B (en) * | 2020-06-19 | 2021-09-10 | 辽宁东科电力有限公司 | One-key whole-course automatic control method for water supply of supercritical once-through boiler |
| CN112462604A (en) * | 2020-10-28 | 2021-03-09 | 国家能源集团泰州发电有限公司 | Genetic algorithm-based ultra-supercritical unit dry-wet state modeling and coordination control method |
| CN113883496A (en) * | 2021-09-26 | 2022-01-04 | 华能巢湖发电有限责任公司 | Furnace circulating pump water level control method |
| CN113883496B (en) * | 2021-09-26 | 2023-08-11 | 华能巢湖发电有限责任公司 | Water level control method for circulating pump of furnace |
| CN114646051A (en) * | 2022-03-17 | 2022-06-21 | 国网湖南省电力有限公司 | Automatic control method and system for water supply of wet-state operation boiler of supercritical thermal power generating unit |
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