CN113357689A - Method for improving adjusting capacity of heat supply unit - Google Patents
Method for improving adjusting capacity of heat supply unit Download PDFInfo
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- CN113357689A CN113357689A CN202110732810.6A CN202110732810A CN113357689A CN 113357689 A CN113357689 A CN 113357689A CN 202110732810 A CN202110732810 A CN 202110732810A CN 113357689 A CN113357689 A CN 113357689A
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 230000001105 regulatory effect Effects 0.000 claims abstract description 53
- 238000004146 energy storage Methods 0.000 claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 238000000605 extraction Methods 0.000 claims description 94
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 53
- 238000005259 measurement Methods 0.000 claims description 20
- 238000009530 blood pressure measurement Methods 0.000 claims description 16
- 238000009529 body temperature measurement Methods 0.000 claims description 16
- 230000001276 controlling effect Effects 0.000 claims description 12
- 229920006395 saturated elastomer Polymers 0.000 claims description 7
- 238000010248 power generation Methods 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 4
- 238000003303 reheating Methods 0.000 claims description 4
- 238000001704 evaporation Methods 0.000 claims description 3
- 230000008020 evaporation Effects 0.000 claims description 3
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- 238000004519 manufacturing process Methods 0.000 description 2
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Classifications
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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
- F24D1/00—Steam central heating systems
- F24D1/02—Steam central heating systems operating with live steam
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/02—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
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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
- F24D11/00—Central heating systems using heat accumulated in storage masses
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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
- F24D19/1003—Arrangement or mounting of control or safety devices for steam heating systems
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- Thermal Sciences (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
A method for improving the regulating capacity of a heat supply unit relates to the technical field of heat supply engineering. The invention aims to solve the problems that the work efficiency of a peak regulation system of a heat supply unit is improved by improving the regulation capacity of the heat supply unit, and the peak regulation of the heat supply unit is limited in a heat supply peak period. A method for improving the regulation capacity of a heat supply unit is characterized in that the condition of the heat supply unit is determined and judged, a steam energy storage peak regulation system is further utilized, the heat supply load and the power supply load of the heat supply unit are adjusted according to a heating power dispatching instruction and a power dispatching instruction, and the heat supply unit can efficiently meet thermoelectric requirements under emergency conditions. Meanwhile, the invention controls the opening degree of the EV or the LV to carry out peak regulation treatment on the heat supply unit by receiving a load change instruction, thereby improving the peak regulation capability. The invention can obtain a method for improving the adjusting capacity of the heat supply unit.
Description
Technical Field
The invention relates to the technical field of heat supply engineering, in particular to a method for improving the regulating capacity of a heat supply unit.
Background
The heat supply unit is a unit configured by full-automatic field control (manual inspection is needed), an electric regulating valve is matched on a primary network to control the temperature of water supplied by a secondary network; has the outdoor temperature compensation function; the circulating pump adopts frequency conversion control, the pressure difference of supply water and return water of the secondary network is used as a feedback signal, and the secondary network performs variable flow control; the water replenishing pump adopts variable frequency water replenishing and takes the return water pressure of the secondary network as a feedback signal; the water level sensor of the water replenishing tank can automatically control the water level of the water tank and has the function of protecting the water replenishing pump from water shortage; a pressure relief electromagnetic valve is additionally arranged on the secondary network water return pipeline, and if the secondary water return pressure exceeds a set value, the electromagnetic valve is automatically opened to relieve the pressure to a safe value and then is automatically closed; all actions of the unit are controlled by the controller in a fully automatic way.
The current heat supply unit, especially the heat supply unit facing the industrial users, has large variation range of day and night heat supply amount. During the production operation of the user in daytime, the steam extraction and heat supply of the unit are large, the load of the power grid is also large, and the problem of insufficient power generation caused by excessive steam extraction can be faced. When the user stops production operation at night, the steam extraction heat supply amount is reduced or even cancelled, the power grid load is small, the unit operates in a low-load state, the operation efficiency is low, and the problems that the heat supply unit cannot realize stable combustion, denitration and the like are caused by low load.
Meanwhile, the peak regulation of the power grid is difficult in winter in northern areas, namely, the peak regulation amplitude of a heat supply unit is limited, the peak regulation margin of the power grid is low, and the wind power generation capacity is large, so that the larger peak regulation demand is inevitably brought, which is the key problem that the direct power regulation plant of the power grid in northern areas needs to solve urgently at present. Aiming at the problem that peak regulation of a heat supply unit is limited in the heat supply peak period in the related art, the problem is not solved effectively all the time.
Disclosure of Invention
The invention aims to solve the problems that the work efficiency of a peak regulation system of a heat supply unit is improved by improving the regulation capacity of the heat supply unit and the peak regulation of the heat supply unit is limited in a heat supply peak period, and provides a method for improving the regulation capacity of the heat supply unit.
A method for improving the regulating capacity of a heat supply unit comprises the following steps:
firstly, determining the condition of a heat supply unit during the heat supply period of the heat supply unit, and specifically comprising the following steps:
(1) state feedback signals of 7 valves including a high-pressure bypass adjusting valve, a high-pressure bypass desuperheating water adjusting valve, a front shutoff valve of the high-pressure bypass adjusting valve, a low-pressure bypass desuperheating water adjusting valve, a low-pressure bypass to condenser shutoff valve and a low-pressure bypass to heat supply network heater shutoff valve are displayed as good quality in a unit Distributed Control System (DCS);
(2) state signals of 13 measurement values including a high bypass steam flow measurement value, a high bypass desuperheating water flow measurement value, a low bypass steam flow measurement value, a high pressure cylinder exhaust steam pressure measurement value, a high pressure cylinder exhaust steam temperature measurement value, a high pressure bypass regulating valve rear steam temperature measurement value, a low pressure bypass regulating valve rear steam temperature measurement value, a machine front pressure measurement value, a reheating steam pressure measurement value, a heating steam main pipe temperature measurement value, a machine set actual power generation power measurement value and a steam turbine regulating stage pressure measurement value are displayed as good quality in a machine set DCS;
judging the condition of the heat supply unit according to the step one, and further improving the adjusting capacity of the heat supply unit by using a steam energy storage peak shaving system through the following method:
1) adding water into the steam heat accumulator through a water supply device, and reserving a part of space at the top of the steam heat accumulator for storing steam; when the steam extraction and heat supply unit operates, steam generated by the steam extraction and heat supply unit enters the steam heat accumulator, and the steam heat accumulator heats and mixes with feed water in the steam heat accumulator; as the steam continuously enters, the pressure and the temperature of liquid water in the steam heat accumulator continuously increase to reach a saturated state; when a user needs to use steam, the steam in the steam heat accumulator is regulated to parameters required by the user through the temperature and pressure regulating device and then is supplied to the user for use; when the steam heat accumulator is in operation failure, steam generated by the steam extraction and heat supply unit is directly conveyed to the temperature and pressure regulating device to be supplied to a user, so that the normal use of the user is not influenced;
2) receiving a load change instruction, wherein the load change instruction is used for indicating that the load capacity of the heat supply unit is changed from a first load capacity to a second load capacity;
determining a total steam extraction instruction according to the load change instruction, wherein the total steam extraction instruction is used for indicating the extracted heat supply steam extraction flow; determining the opening degree of EV or LV in the heat supply network circulating system corresponding to the total steam extraction instruction according to the corresponding relation between the steam extraction instruction and the opening degrees of the heat supply steam extraction valve EV and the low-pressure cylinder steam inlet valve LV; sending a control instruction to the EV or the LV, wherein the control instruction is used for controlling and adjusting the opening degree of the EV or the LV; and carrying out peak shaving treatment on the heat supply unit by controlling the opening degree of the EV or the LV.
The invention has the beneficial effects that:
(1) according to the method for improving the adjusting capacity of the heat supply unit, the condition of the heat supply unit is determined and judged during heat supply of the heat supply unit, and then the heat supply load and the power supply load of the heat supply unit are adjusted according to the thermal scheduling instruction and the power scheduling instruction by using the steam energy storage peak shaving system, so that the heat supply unit can efficiently meet the thermoelectric requirement under the emergency condition. Meanwhile, the invention receives the load change instruction, determines the total steam extraction instruction according to the load change instruction, sends a control instruction to the EV or the LV, and performs peak regulation treatment on the heat supply unit by controlling the opening degree of the EV or the LV, thereby solving the problem that the peak regulation of the heat supply unit is limited in the heat supply peak period in the related technology, and improving the peak regulation capacity by the heat supply network energy storage auxiliary peak regulation treatment.
(2) The invention improves the adjusting capacity of the heat supply unit, further improves the working efficiency of the peak shaving system of the heat supply unit, reduces the low-load operation time of the heat supply unit in the heat supply low-peak period and reduces the low-load operation risk.
The invention can obtain a method for improving the adjusting capacity of the heat supply unit.
Detailed Description
The first embodiment is as follows: the method for improving the regulating capacity of the heat supply unit comprises the following steps:
firstly, determining the condition of a heat supply unit during the heat supply period of the heat supply unit, and specifically comprising the following steps:
(1) state feedback signals of 7 valves including a high-pressure bypass adjusting valve, a high-pressure bypass desuperheating water adjusting valve, a front shutoff valve of the high-pressure bypass adjusting valve, a low-pressure bypass desuperheating water adjusting valve, a low-pressure bypass to condenser shutoff valve and a low-pressure bypass to heat supply network heater shutoff valve are displayed as good quality in a unit Distributed Control System (DCS);
(2) state signals of 13 measurement values including a high bypass steam flow measurement value, a high bypass desuperheating water flow measurement value, a low bypass steam flow measurement value, a high pressure cylinder exhaust steam pressure measurement value, a high pressure cylinder exhaust steam temperature measurement value, a high pressure bypass regulating valve rear steam temperature measurement value, a low pressure bypass regulating valve rear steam temperature measurement value, a machine front pressure measurement value, a reheating steam pressure measurement value, a heating steam main pipe temperature measurement value, a machine set actual power generation power measurement value and a steam turbine regulating stage pressure measurement value are displayed as good quality in a machine set DCS;
judging the condition of the heat supply unit according to the step one, and further improving the adjusting capacity of the heat supply unit by using a steam energy storage peak shaving system through the following method:
1) adding water into the steam heat accumulator through a water supply device, and reserving a part of space at the top of the steam heat accumulator for storing steam; when the steam extraction and heat supply unit operates, steam generated by the steam extraction and heat supply unit enters the steam heat accumulator, and the steam heat accumulator heats and mixes with feed water in the steam heat accumulator; as the steam continuously enters, the pressure and the temperature of liquid water in the steam heat accumulator continuously increase to reach a saturated state; when a user needs to use steam, the steam in the steam heat accumulator is regulated to parameters required by the user through the temperature and pressure regulating device and then is supplied to the user for use; when the steam heat accumulator is in operation failure, steam generated by the steam extraction and heat supply unit is directly conveyed to the temperature and pressure regulating device to be supplied to a user, so that the normal use of the user is not influenced;
2) receiving a load change instruction, wherein the load change instruction is used for indicating that the load capacity of the heat supply unit is changed from a first load capacity to a second load capacity;
determining a total steam extraction instruction according to the load change instruction, wherein the total steam extraction instruction is used for indicating the extracted heat supply steam extraction flow; determining the opening degree of EV or LV in the heat supply network circulating system corresponding to the total steam extraction instruction according to the corresponding relation between the steam extraction instruction and the opening degrees of the heat supply steam extraction valve EV and the low-pressure cylinder steam inlet valve LV; sending a control instruction to the EV or the LV, wherein the control instruction is used for controlling and adjusting the opening degree of the EV or the LV; and carrying out peak shaving treatment on the heat supply unit by controlling the opening degree of the EV or the LV.
The second embodiment is as follows: the present embodiment differs from the present embodiment in that: in the step one, the specific range of the measured value of the actual generating power of the unit, which is lower than the value S, is 40-50% of the rated capacity of the unit.
Other steps are the same as those in the first embodiment.
The third concrete implementation mode: the first or second differences from the present embodiment are as follows: the automatic control command logic of the high-pressure bypass regulating valve in the step one is as follows:
a low-side steam flow measured value, a high-side desuperheating water flow measured value, a high-side steam flow measured value, a low-pressure bypass adjusting valve control instruction and a high-pressure bypass adjusting valve heat supply unit start and stop mode control instruction can be directly read from a DCS real-time database; switching conditions are as follows: the locking opening condition is met, the locking closing condition is met, the linkage opening condition is met, the linkage closing condition is met, the condition that the protection is closed to 0 is met, and the heat supply unit is in a bypass heat supply mode and is obtained through logic judgment; the locking opening condition, the locking closing condition, the interlocking opening condition and the interlocking closing condition are formed by judging the exhaust pressure of a high-pressure cylinder through threshold values, f2(x) is a self-carrying broken line function of the DCS, the input of the self-carrying broken line function is the pressure of a regulating stage of a steam turbine, the output of the self-carrying broken line function is a threshold value A, f3(x) is a self-carrying broken line function of the DCS, the input of the self-carrying broken line function of the steam turbine is the pressure of the regulating stage of the steam turbine, the output of the self-carrying broken line function of the DCS is a threshold value B, f4(x) is a self-carrying broken line function of the DCS, the input of the self-carrying broken line function of the steam turbine is the pressure of the regulating stage of the steam turbine, the output of the self-carrying broken line function of the DCS 5(x) is a threshold value E; f1(x) is a broken line function of the DCS, the input of the broken line function is a control instruction of the low-pressure bypass regulating valve, and the output of the broken line function is a follow-up control instruction of the high-pressure bypass regulating valve; the parameters of f1(x), f2(x), f3(x), f4(x) and f5(x) can be set on line according to a real-time curve, and the setting principle is that the deep peak regulation capability of the unit is improved on the premise of meeting the heat supply requirement through the conventional DCS bypass control system.
The other steps are the same as those in the first or second embodiment.
The fourth concrete implementation mode: the difference between this embodiment and one of the first to third embodiments is as follows: the steam energy storage and peak regulation system in the second step comprises a steam extraction and heat supply unit, wherein the steam extraction and heat supply unit is connected with a steam inlet of the temperature and pressure regulation device through a first steam conveying pipeline; the steam extraction heat supply unit is also connected with an inlet of a steam heat accumulator through a second steam conveying pipeline, an outlet of the steam heat accumulator is connected with a steam inlet of a temperature and pressure adjusting device through a third steam conveying pipeline, and a steam outlet of the temperature and pressure adjusting device is connected with a user through a fourth steam conveying pipeline; the steam heat accumulator is also connected with a plant heat exchange device through a fifth steam conveying pipeline and a steam backflow pipeline, and the water supply device is connected with the steam heat accumulator through a water supply pipeline.
The other steps are the same as those in the first to third embodiments.
The fifth concrete implementation mode: the difference between this embodiment and one of the first to fourth embodiments is: if the steam consumption of the user temporarily exceeds the maximum evaporation capacity of the steam extraction and heat supply unit or the steam consumption of the user changes too much in a short time, so that the steam quantity provided by the steam extraction and heat supply unit cannot immediately meet the quantity required by the user, the steam in the steam heat accumulator is reduced, the pressure is reduced, saturated water is flashed into steam, and a steam quantity gap is supplemented;
if the user stops using the steam, the steam extraction and heat supply unit is switched to a stable relatively low non-steam supply power state, the steam generated by the steam extraction and heat supply unit enters the steam heat accumulator, and the steam heat accumulator does not discharge the steam outwards any more;
if the steam in the steam heat accumulator is stored too much, the heat of the working medium in the steam heat accumulator is transferred to other working media through the in-plant heat exchange device, and the energy is fully utilized; the working medium after releasing heat returns to the steam heat accumulator through a return pipeline and is continuously heated by steam.
The other steps are the same as those in the first to fourth embodiments.
The sixth specific implementation mode: the difference between this embodiment and one of the first to fifth embodiments is as follows: before receiving the load change instruction in the second step, the method further comprises the following steps:
when the heat supply steam extraction valve EV is fully opened, the working point is M; when the heat supply steam extraction valve EV is closed, the pipeline resistance is increased, the flow is reduced, the pipeline characteristic curve is changed from I to I', and the working point is moved to the point A; adjusting the heat supply extraction flow to delta hj ═ HA-HB;
when the low-pressure cylinder inlet valve LV is fully opened, the working point is M1(ii) a When the low-pressure cylinder inlet valve LV is closed, the pipeline resistance is increased, the flow is reduced, and the pipeline characteristic curve is represented by I1Is changed into I1', the operating point is moved to A1Point; the flow rate of heat supply extraction steam is adjusted to delta hj1＝HA1-HB1。
The other steps are the same as those in the first to fifth embodiments.
The seventh embodiment: the difference between this embodiment and one of the first to sixth embodiments is: determining the total steam extraction instruction according to the load change instruction in the second step comprises the following steps:
detecting the actual heat supply steam extraction flow extracted from the heat supply network circulating system;
determining a flow deviation signal according to the actual heat supply extraction flow and a second heat supply extraction flow required by the second load, wherein the flow deviation signal is used for controlling the opening degree of the EV or the LV so as to compensate a difference value between the actual heat supply extraction flow and the second heat supply extraction flow; and correcting the total steam extraction instruction according to the flow deviation signal.
The other steps are the same as those in the first to sixth embodiments.
The following examples were used to demonstrate the beneficial effects of the present invention:
example 1: a method for improving the regulating capacity of a heat supply unit comprises the following steps:
firstly, determining the condition of a heat supply unit during the heat supply period of the heat supply unit, and specifically comprising the following steps:
(1) state feedback signals of 7 valves including a high-pressure bypass adjusting valve, a high-pressure bypass desuperheating water adjusting valve, a front shutoff valve of the high-pressure bypass adjusting valve, a low-pressure bypass desuperheating water adjusting valve, a low-pressure bypass to condenser shutoff valve and a low-pressure bypass to heat supply network heater shutoff valve are displayed as good quality in a unit Distributed Control System (DCS);
the automatic control command logic of the high-pressure bypass regulating valve is as follows:
a low-side steam flow measured value, a high-side desuperheating water flow measured value, a high-side steam flow measured value, a low-pressure bypass adjusting valve control instruction and a high-pressure bypass adjusting valve heat supply unit start and stop mode control instruction can be directly read from a DCS real-time database; switching conditions are as follows: the locking opening condition is met, the locking closing condition is met, the linkage opening condition is met, the linkage closing condition is met, the condition that the protection is closed to 0 is met, and the heat supply unit is in a bypass heat supply mode and is obtained through logic judgment; the locking opening condition, the locking closing condition, the interlocking opening condition and the interlocking closing condition are formed by judging the exhaust pressure of a high-pressure cylinder through threshold values, f2(x) is a self-carrying broken line function of the DCS, the input of the self-carrying broken line function is the pressure of a regulating stage of a steam turbine, the output of the self-carrying broken line function is a threshold value A, f3(x) is a self-carrying broken line function of the DCS, the input of the self-carrying broken line function of the steam turbine is the pressure of the regulating stage of the steam turbine, the output of the self-carrying broken line function of the DCS is a threshold value B, f4(x) is a self-carrying broken line function of the DCS, the input of the self-carrying broken line function of the steam turbine is the pressure of the regulating stage of the steam turbine, the output of the self-carrying broken line function of the DCS 5(x) is a threshold value E; f1(x) is a broken line function of the DCS, the input of the broken line function is a control instruction of the low-pressure bypass regulating valve, and the output of the broken line function is a follow-up control instruction of the high-pressure bypass regulating valve; the parameters of f1(x), f2(x), f3(x), f4(x) and f5(x) can be set on line according to a real-time curve, and the setting principle is that the deep peak regulation capability of the unit is improved on the premise of meeting the heat supply requirement through the conventional DCS bypass control system.
(2) State signals of 13 measurement values including a high bypass steam flow measurement value, a high bypass desuperheating water flow measurement value, a low bypass steam flow measurement value, a high pressure cylinder exhaust steam pressure measurement value, a high pressure cylinder exhaust steam temperature measurement value, a high pressure bypass regulating valve rear steam temperature measurement value, a low pressure bypass regulating valve rear steam temperature measurement value, a machine front pressure measurement value, a reheating steam pressure measurement value, a heating steam main pipe temperature measurement value, a machine set actual power generation power measurement value and a steam turbine regulating stage pressure measurement value are displayed as good quality in a machine set DCS; the specific range of the actual generating power measured value of the unit lower than the value S is 40-50% of the rated capacity of the unit.
Judging the condition of the heat supply unit according to the step one, and further improving the adjusting capacity of the heat supply unit by using a steam energy storage peak shaving system through the following method:
1) adding water into the steam heat accumulator through a water supply device, and reserving a part of space at the top of the steam heat accumulator for storing steam; when the steam extraction and heat supply unit operates, steam generated by the steam extraction and heat supply unit enters the steam heat accumulator, and the steam heat accumulator heats and mixes with feed water in the steam heat accumulator; as the steam continuously enters, the pressure and the temperature of liquid water in the steam heat accumulator continuously increase to reach a saturated state; when a user needs to use steam, the steam in the steam heat accumulator is regulated to parameters required by the user through the temperature and pressure regulating device and then is supplied to the user for use; when the steam heat accumulator is in operation failure, steam generated by the steam extraction and heat supply unit is directly conveyed to the temperature and pressure regulating device to be supplied to a user, so that the normal use of the user is not influenced;
if the user steam consumption temporarily exceeds the maximum evaporation capacity of the steam extraction and heat supply unit, or the user steam consumption changes too much in a short time, so that the steam quantity provided by the steam extraction and heat supply unit cannot immediately meet the quantity required by the user, the steam in the steam heat accumulator is reduced, the pressure is reduced, saturated water is flashed into steam, and a steam quantity gap is supplemented;
if the user stops using the steam, the steam extraction and heat supply unit is switched to a stable relatively low non-steam supply power state, the steam generated by the steam extraction and heat supply unit enters the steam heat accumulator, and the steam heat accumulator does not discharge the steam outwards any more;
if the steam in the steam heat accumulator is stored too much, the heat of the working medium in the steam heat accumulator is transferred to other working media through the in-plant heat exchange device, and the energy is fully utilized; the working medium after releasing heat returns to the steam heat accumulator through a return pipeline and is continuously heated by steam.
2) Receiving a load change instruction, wherein the load change instruction is used for indicating that the load capacity of the heat supply unit is changed from a first load capacity to a second load capacity;
determining a total steam extraction instruction according to the load change instruction, wherein the total steam extraction instruction is used for indicating the extracted heat supply steam extraction flow; determining the opening degree of EV or LV in the heat supply network circulating system corresponding to the total steam extraction instruction according to the corresponding relation between the steam extraction instruction and the opening degrees of the heat supply steam extraction valve EV and the low-pressure cylinder steam inlet valve LV; sending a control instruction to the EV or the LV, wherein the control instruction is used for controlling and adjusting the opening degree of the EV or the LV; and carrying out peak shaving treatment on the heat supply unit by controlling the opening degree of the EV or the LV.
Before receiving the load change instruction, the method further comprises the following steps:
when the heat supply steam extraction valve EV is fully opened, the working point is M; when the heat supply steam extraction valve EV is closed, the pipeline resistance is increased, the flow is reduced, the pipeline characteristic curve is changed from I to I', and the working point is moved to the point A; adjusting the heat supply extraction flow to delta hj ═ HA-HB;
when the low-pressure cylinder inlet valve LV is fully opened, the working point is M1(ii) a When the low-pressure cylinder inlet valve LV is closed, the pipeline resistance is increased, the flow is reduced, and the pipeline characteristic curve is represented by I1Is changed into I1', the operating point is moved to A1Point; the flow rate of heat supply extraction steam is adjusted to delta hj1＝HA1-HB1。
Determining the total steam extraction instruction according to the load change instruction comprises:
detecting the actual heat supply steam extraction flow extracted from the heat supply network circulating system;
determining a flow deviation signal according to the actual heat supply extraction flow and a second heat supply extraction flow required by the second load, wherein the flow deviation signal is used for controlling the opening degree of the EV or the LV so as to compensate a difference value between the actual heat supply extraction flow and the second heat supply extraction flow; and correcting the total steam extraction instruction according to the flow deviation signal.
The steam energy storage and peak regulation system comprises a steam extraction and heat supply unit, wherein the steam extraction and heat supply unit is connected with a steam inlet of the temperature and pressure regulation device through a first steam conveying pipeline; the steam extraction heat supply unit is also connected with an inlet of a steam heat accumulator through a second steam conveying pipeline, an outlet of the steam heat accumulator is connected with a steam inlet of a temperature and pressure adjusting device through a third steam conveying pipeline, and a steam outlet of the temperature and pressure adjusting device is connected with a user through a fourth steam conveying pipeline; the steam heat accumulator is also connected with a plant heat exchange device through a fifth steam conveying pipeline and a steam backflow pipeline, and the water supply device is connected with the steam heat accumulator through a water supply pipeline.
Claims (7)
1. A method for improving the regulating capacity of a heat supply unit is characterized by comprising the following steps:
firstly, determining the condition of a heat supply unit during the heat supply period of the heat supply unit, and specifically comprising the following steps:
(1) state feedback signals of 7 valves including a high-pressure bypass adjusting valve, a high-pressure bypass desuperheating water adjusting valve, a front shutoff valve of the high-pressure bypass adjusting valve, a low-pressure bypass desuperheating water adjusting valve, a low-pressure bypass to condenser shutoff valve and a low-pressure bypass to heat supply network heater shutoff valve are displayed as good quality in a unit Distributed Control System (DCS);
(2) state signals of 13 measurement values including a high bypass steam flow measurement value, a high bypass desuperheating water flow measurement value, a low bypass steam flow measurement value, a high pressure cylinder exhaust steam pressure measurement value, a high pressure cylinder exhaust steam temperature measurement value, a high pressure bypass regulating valve rear steam temperature measurement value, a low pressure bypass regulating valve rear steam temperature measurement value, a machine front pressure measurement value, a reheating steam pressure measurement value, a heating steam main pipe temperature measurement value, a machine set actual power generation power measurement value and a steam turbine regulating stage pressure measurement value are displayed as good quality in a machine set DCS;
judging the condition of the heat supply unit according to the step one, and further improving the adjusting capacity of the heat supply unit by using a steam energy storage peak shaving system through the following method:
1) adding water into the steam heat accumulator through a water supply device, and reserving a part of space at the top of the steam heat accumulator for storing steam; when the steam extraction and heat supply unit operates, steam generated by the steam extraction and heat supply unit enters the steam heat accumulator, and the steam heat accumulator heats and mixes with feed water in the steam heat accumulator; as the steam continuously enters, the pressure and the temperature of liquid water in the steam heat accumulator continuously increase to reach a saturated state; when a user needs to use steam, the steam in the steam heat accumulator is regulated to parameters required by the user through the temperature and pressure regulating device and then is supplied to the user for use; when the steam heat accumulator is in operation failure, steam generated by the steam extraction and heat supply unit is directly conveyed to the temperature and pressure regulating device to be supplied to a user, so that the normal use of the user is not influenced;
2) receiving a load change instruction, wherein the load change instruction is used for indicating that the load capacity of the heat supply unit is changed from a first load capacity to a second load capacity;
determining a total steam extraction instruction according to the load change instruction, wherein the total steam extraction instruction is used for indicating the extracted heat supply steam extraction flow; determining the opening degree of EV or LV in the heat supply network circulating system corresponding to the total steam extraction instruction according to the corresponding relation between the steam extraction instruction and the opening degrees of the heat supply steam extraction valve EV and the low-pressure cylinder steam inlet valve LV; sending a control instruction to the EV or the LV, wherein the control instruction is used for controlling and adjusting the opening degree of the EV or the LV; and carrying out peak shaving treatment on the heat supply unit by controlling the opening degree of the EV or the LV.
2. A method according to claim 1, wherein in step one said measured value of the actual generated power of the unit is less than a value S in the specific range of 40% to 50% of the rated capacity of the unit.
3. The method according to claim 1, wherein the automatic control command logic of the high pressure bypass regulating valve in the first step is as follows:
a low-side steam flow measured value, a high-side desuperheating water flow measured value, a high-side steam flow measured value, a low-pressure bypass adjusting valve control instruction and a high-pressure bypass adjusting valve heat supply unit start and stop mode control instruction can be directly read from a DCS real-time database; switching conditions are as follows: the locking opening condition is met, the locking closing condition is met, the linkage opening condition is met, the linkage closing condition is met, the condition that the protection is closed to 0 is met, and the heat supply unit is in a bypass heat supply mode and is obtained through logic judgment; the locking opening condition, the locking closing condition, the interlocking opening condition and the interlocking closing condition are formed by judging the exhaust pressure of a high-pressure cylinder through threshold values, f2(x) is a self-carrying broken line function of the DCS, the input of the self-carrying broken line function is the pressure of a regulating stage of a steam turbine, the output of the self-carrying broken line function is a threshold value A, f3(x) is a self-carrying broken line function of the DCS, the input of the self-carrying broken line function of the steam turbine is the pressure of the regulating stage of the steam turbine, the output of the self-carrying broken line function of the DCS is a threshold value B, f4(x) is a self-carrying broken line function of the DCS, the input of the self-carrying broken line function of the steam turbine is the pressure of the regulating stage of the steam turbine, the output of the self-carrying broken line function of the DCS 5(x) is a threshold value E; f1(x) is a broken line function of the DCS, the input of the broken line function is a control instruction of the low-pressure bypass regulating valve, and the output of the broken line function is a follow-up control instruction of the high-pressure bypass regulating valve; the parameters of f1(x), f2(x), f3(x), f4(x) and f5(x) can be set on line according to a real-time curve, and the setting principle is that the deep peak regulation capability of the unit is improved on the premise of meeting the heat supply requirement through the conventional DCS bypass control system.
4. The method for improving the regulating capacity of the heat supply unit according to claim 1, wherein the steam energy storage and peak regulation system in the second step comprises a steam extraction and heat supply unit, wherein the steam extraction and heat supply unit is connected with a steam inlet of the temperature and pressure regulating device through a first steam conveying pipeline; the steam extraction heat supply unit is also connected with an inlet of a steam heat accumulator through a second steam conveying pipeline, an outlet of the steam heat accumulator is connected with a steam inlet of a temperature and pressure adjusting device through a third steam conveying pipeline, and a steam outlet of the temperature and pressure adjusting device is connected with a user through a fourth steam conveying pipeline; the steam heat accumulator is also connected with a plant heat exchange device through a fifth steam conveying pipeline and a steam backflow pipeline, and the water supply device is connected with the steam heat accumulator through a water supply pipeline.
5. The method for improving the regulation capacity of the heat supply unit according to claim 1, wherein in the second step, if the steam consumption of the user temporarily exceeds the maximum evaporation capacity of the steam extraction and heat supply unit, or the steam consumption of the user changes too much in a short time, so that the steam quantity provided by the steam extraction and heat supply unit cannot immediately meet the quantity required by the user, the steam in the steam heat accumulator is reduced, the pressure is reduced, saturated water is flashed into steam, and a steam quantity gap is supplemented;
if the user stops using the steam, the steam extraction and heat supply unit is switched to a stable relatively low non-steam supply power state, the steam generated by the steam extraction and heat supply unit enters the steam heat accumulator, and the steam heat accumulator does not discharge the steam outwards any more;
if the steam in the steam heat accumulator is stored too much, the heat of the working medium in the steam heat accumulator is transferred to other working media through the in-plant heat exchange device, and the energy is fully utilized; the working medium after releasing heat returns to the steam heat accumulator through a return pipeline and is continuously heated by steam.
6. The method for improving the regulating capacity of the heating unit according to claim 1, wherein before receiving the load change instruction in the second step, the method further comprises the following steps:
when the heat supply steam extraction valve EV is fully opened, the working point is M; when the heat supply steam extraction valve EV is closed, the pipeline resistance is increased, the flow is reduced, the pipeline characteristic curve is changed from I to I', and the working point is moved to the point A; adjusting the heat supply extraction flow to delta hj ═ HA-HB;
when the low-pressure cylinder inlet valve LV is fully opened, the working point is M1(ii) a When the low-pressure cylinder inlet valve LV is closed, the pipeline resistance is increased, the flow is reduced, and the pipeline characteristic curve is represented by I1Is changed into I1', the operating point is moved to A1Point; the flow rate of heat supply extraction steam is adjusted to delta hj1＝HA1-HB1。
7. The method for improving the regulating capacity of the heating unit according to claim 1, wherein the step two of determining the total steam extraction command according to the load change command comprises the following steps:
detecting the actual heat supply steam extraction flow extracted from the heat supply network circulating system;
determining a flow deviation signal according to the actual heat supply extraction flow and a second heat supply extraction flow required by the second load, wherein the flow deviation signal is used for controlling the opening degree of the EV or the LV so as to compensate a difference value between the actual heat supply extraction flow and the second heat supply extraction flow; and correcting the total steam extraction instruction according to the flow deviation signal.
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