CN111412453B - Power control method under heat storage and heat release working condition of heat storage peak shaving system - Google Patents
Power control method under heat storage and heat release working condition of heat storage peak shaving system Download PDFInfo
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- CN111412453B CN111412453B CN202010282279.2A CN202010282279A CN111412453B CN 111412453 B CN111412453 B CN 111412453B CN 202010282279 A CN202010282279 A CN 202010282279A CN 111412453 B CN111412453 B CN 111412453B
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- 238000005338 heat storage Methods 0.000 title claims abstract description 113
- 238000000034 method Methods 0.000 title claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 193
- 230000001105 regulatory effect Effects 0.000 claims description 82
- 238000001514 detection method Methods 0.000 claims description 63
- 238000012545 processing Methods 0.000 claims description 61
- 239000007788 liquid Substances 0.000 claims description 30
- 230000008859 change Effects 0.000 claims description 19
- 238000006243 chemical reaction Methods 0.000 claims description 13
- 238000009825 accumulation Methods 0.000 claims description 12
- 238000004364 calculation method Methods 0.000 claims description 8
- 238000004458 analytical method Methods 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 4
- 230000009194 climbing Effects 0.000 abstract description 7
- 238000005516 engineering process Methods 0.000 abstract description 6
- 230000033228 biological regulation Effects 0.000 description 13
- 238000010248 power generation Methods 0.000 description 12
- 238000009833 condensation Methods 0.000 description 6
- 230000005494 condensation Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 230000007423 decrease Effects 0.000 description 4
- 230000004075 alteration Effects 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000006467 substitution reaction Methods 0.000 description 3
- 230000003750 conditioning effect Effects 0.000 description 2
- 238000011217 control strategy Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 230000007363 regulatory process Effects 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D3/00—Accumulators for preheated water
- F22D3/04—Accumulators for preheated water combined with steam accumulators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D5/00—Controlling water feed or water level; Automatic water feeding or water-level regulators
- F22D5/26—Automatic feed-control systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B9/00—Auxiliary systems, arrangements, or devices
- F28B9/08—Auxiliary systems, arrangements, or devices for collecting and removing condensate
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The invention provides a power control method under the heat storage and release working condition of a heat storage peak shaving system, which comprises the steps that under the heat storage mode, condensed water (cold water) sent out by a condensed water pump passes through a heater and then enters a deaerator, and the other path enters a water storage tank, and equivalent cold water is discharged to a condenser from the water storage tank. Because the total amount of the water entering the deaerator is relatively fixed, the flow entering the water storage tank is increased, the flow passing through the heater is also increased, and the unit power is reduced, and vice versa. Under the heat release mode, one path of condensed water sent by the condensed water pump enters the deaerator through the heater, the other path of condensed water enters the water storage tank, and the equal amount of hot water is pumped to the deaerator from the water storage tank by virtue of the booster pump. Because the total amount of the water entering the deaerator is relatively fixed, the flow pumped out of the water storage tank is increased, the flow passing through the heater is reduced, and the generating power of the unit is increased, and vice versa. The method for improving the climbing rate of the unit by utilizing the heat storage technology of the water storage tank is a novel mode for improving the climbing rate of the unit.
Description
Technical Field
The invention relates to the field of peak regulation of thermal power generation technology, in particular to a heat storage peak regulation system and a control method thereof.
Background
In order to meet the requirement of rapid development of renewable energy sources, the capability of the renewable energy sources for absorbing is improved, and the flexibility of a power grid is urgently required to be improved. Wherein the flexibility of load adjustment includes: deep peak shaving (low-load operation of a boiler and a steam turbine), quick start-stop of a unit, climbing speed of the unit and thermoelectric decoupling of a cogeneration unit.
At present, the generating power of a unit is quickly adjusted, and the heat accumulating capacity of a boiler is released in a short period mainly by using a steam turbine steam inlet valve; in the condensate throttling optimization mode, the condensate flow rate passing through the heater is changed for a short time.
The heat storage capacity of the boiler can quickly respond to a scheduling command, but the heat storage capacity is limited, the unit output can only be increased for a short time, and the main steam pressure is greatly fluctuated. The condensate water throttling optimization mode enables the output electric power of the steam turbine to be increased by closing the condensate water regulating valve flow and depending on the self-balancing capacity of the low-pressure heater of the unit, but when the condensate water flow is changed greatly, the water level of the deaerator and the water level of the condenser are disturbed greatly, the safe operation of the unit can be influenced by changing the condensate water flow for a long time, and the continuous capacity can not be ensured.
Disclosure of Invention
The invention designs a power control method under the heat storage working condition of the heat storage peak shaving system and a power control method under the heat release working condition of the heat storage peak shaving system, and realizes the rapid adjustment of the power generation power of a thermal generator set (hereinafter referred to as a set) by controlling the heat storage flow and the heat release flow of the heat storage system, thereby improving the adjustment rate of the set and further improving the capacity of the set to participate in peak shaving and frequency modulation of a power grid.
The invention firstly provides a power control method under a heat storage working condition of a heat storage peak shaving system, wherein the heat storage peak shaving system comprises a main regulator and a steam turbine generator unit, and the method comprises the following steps: the heat accumulation peak shaving system also comprises at least one heater, a deaerator, a water storage tank, a condenser, a condensate pump, a booster pump and a plurality of valve groups, wherein the valve groups comprise a lower main path and an upper bypass, and the lower main path comprises shutoff valves at two ends and a regulating valve in the middle;
The water supply adjusting pipeline is provided with a first valve group and a first pipeline flow detection processing device, and the heater is connected to a steam turbine generator unit;
The system comprises a water storage tank, a deaerator, a heat storage peak shaving system, a booster pump, a second pipeline flow detection processing device, a second valve group and a control unit, wherein a hot water pipeline of the heat storage peak shaving system is formed between the water storage tank and the deaerator, the water storage tank is connected with the booster pump, the booster pump is connected with the second pipeline flow detection processing device and the second valve group, and the second valve group comprises a lower main path and an upper bypass; the booster pump is connected in parallel with a branch line comprising a fifth pipeline flow detection processing device and a fifth valve group, a heat release branch line of a hot water pipeline is formed by the booster pump, the second pipeline flow detection processing device and a main line below the second valve group, a heat storage branch line of the hot water pipeline is formed by a bypass above the second valve group, the second pipeline flow detection processing device, the fifth pipeline flow detection processing device and the fifth valve group, the hot water pipeline is finally connected to the deaerator, and a fourth valve group and a fourth pipeline flow detection processing device are arranged on the main line where the deaerator is positioned;
The condensate pump is connected to the water storage tank through a third valve group and a third pipeline flow detection processing device, the condensate pump is connected to the condenser through a sixth valve group, and the water storage tank is connected to the condenser through the third valve group, the third pipeline flow detection processing device and the sixth valve group;
The heat storage working condition of the heat storage peak shaving system is as follows: one path of condensed water in the condenser is sent to the deaerator through the heater, the other path of condensed water is sent to the water storage tank through the heat storage branch line, and then the equivalent amount of cold water is discharged to the condenser from the water storage tank;
The heat storage flow obtained by the fifth pipeline flow detection processing device is the regulated quantity, the opening of the fifth valve group is the regulating quantity, the generating power instruction of the unit to be changed is converted into the corresponding flow through the conversion function of the power and the heat storage flow, the corresponding flow is overlapped with the heat storage flow set value, and the actual heat storage flow is subtracted and then used as the input of the main regulator, so that the opening of the fifth valve group is regulated.
Wherein: the liquid level signal of the deaerator is obtained as a regulated quantity, the rotating speed of the condensate pump is the regulated quantity, and the liquid level of the deaerator is maintained at a set value; the regulating valve and the front and back shutoff valves in the first/second/third valve group are closed, and the bypass valve is fully opened; the regulating valve and the front and back shutoff valves in the fifth/sixth valve group are fully opened, and the bypass valve is fully closed; the valve of the fourth valve group is maintained at a certain opening degree; the booster pump is stopped, and the front valve and the rear valve of the booster pump are closed.
And performing curve fitting on known data by analyzing the calculated data based on calculation data or engineering actual measurement data of the change of the power generation power of the unit under a plurality of typical working conditions of the unit, so as to obtain the corresponding relation between the heat storage flow and the change of the power generation power of the unit under different working conditions.
Wherein: the conversion function of the power and the heat storage and release flow adopts the following formula:
f(L,P)=（0.0137*L2-2.701*L+194.623）P
Wherein, the variable L represents the load rate (unit:%) of the unit corresponding to the THA working condition, and P represents the power (unit: MW) required to be regulated.
The invention also provides a power control method under the heat release working condition of the heat storage peak shaving system, wherein the heat storage peak shaving system comprises a main regulator and a generator set, and the heat storage peak shaving system comprises the following components: the heat accumulation peak shaving system also comprises at least one heater, a deaerator, a water storage tank, a condenser, a condensate pump, a booster pump and a plurality of valve groups, wherein the valve groups comprise a lower main path and an upper bypass, and the lower main path comprises shutoff valves at two ends and a regulating valve in the middle;
The water supply adjusting pipeline is provided with a first valve group and a first pipeline flow detection processing device, and the heater is connected to a steam turbine generator unit;
The system comprises a water storage tank, a deaerator, a heat storage peak shaving system, a booster pump, a second pipeline flow detection processing device, a second valve group and a control unit, wherein a hot water pipeline of the heat storage peak shaving system is formed between the water storage tank and the deaerator, the water storage tank is connected with the booster pump, the booster pump is connected with the second pipeline flow detection processing device and the second valve group, and the second valve group comprises a lower main path and an upper bypass; the booster pump is connected in parallel with a branch line comprising a fifth pipeline flow detection processing device and a fifth valve group, a heat release branch line of a hot water pipeline is formed by the booster pump, the second pipeline flow detection processing device and a main line below the second valve group, a heat storage branch line of the hot water pipeline is formed by a bypass above the second valve group, the second pipeline flow detection processing device, the fifth pipeline flow detection processing device and the fifth valve group, the hot water pipeline is finally connected to the deaerator, and a fourth valve group and a fourth pipeline flow detection processing device are arranged on the main line where the deaerator is positioned;
The condensate pump is connected to the water storage tank through a third valve group and a third pipeline flow detection processing device, the condensate pump is connected to the condenser through a sixth valve group, and the water storage tank is connected to the condenser through the third valve group, the third pipeline flow detection processing device and the sixth valve group;
the exothermic conditions are as follows: the condensation water pump sends out condensation water in the condenser, one path of the condensation water enters the deaerator through the heater, the other path of the condensation water enters the water storage tank through the cold water pipeline, and then the equal amount of hot water is pumped to the deaerator from the water storage tank by virtue of the booster pump;
The method comprises the steps that the condensate flow obtained by a first pipeline flow detection processing device is the regulated quantity, the opening of a first valve group is the regulated quantity, a generating power instruction of a unit to be changed is converted into corresponding flow through a conversion function of power and heat storage and release flow, the corresponding flow is overlapped with a condensate flow set value, and the actual condensate flow is subtracted and then used as the input of a main regulator, so that the opening of the first valve group is regulated.
Wherein: acquiring a liquid level signal of the deaerator as an adjusted quantity, wherein the opening of a regulating valve in the second valve group is the adjusted quantity, and maintaining the liquid level of the water storage tank at a set value; acquiring a booster pump outlet pressure signal as an adjusted quantity, wherein the booster pump rotating speed is an adjusted quantity, and maintaining the booster pump outlet pressure at a set value; acquiring a liquid level signal of the water storage tank as a regulated quantity, wherein the opening of a regulating valve in the third valve group is the regulated quantity, and maintaining the liquid level of the water storage tank at a set value; all valves in the fifth/sixth valve group are closed; the regulating valve and the front and back shutoff valves in the first/second/third valve group are fully opened, and the bypass valve is closed; all valves between the condensate pump and the third valve group are opened; the front valve and the rear valve of the booster pump are opened; the valve of the fourth valve group is fully opened; the condensate pump controls the total condensate flow and meets the requirement of the deaerator on the liquid level change.
Wherein: according to calculation data or engineering actual measurement data of the change of the power generation power of the unit under a plurality of typical working conditions of the unit, curve fitting is carried out on known data through analysis of the calculation data, and the corresponding relation between the heat storage flow and the change of the power generation power of the unit under different working conditions is obtained.
Wherein: the conversion function of the power and the heat storage and release flow adopts the following formula:
f(L,P)=（0.0137*L2-2.701*L+194.623）P
Wherein, the variable L represents the load rate (unit:%) of the unit corresponding to the THA working condition, and P represents the power (unit: MW) required to be regulated.
The beneficial effects of the invention are as follows: in the heat storage mode, the condensed water (cold water) sent by the condensed water pump passes through the heater and then (hot water), one path of the condensed water enters the deaerator, the other path of the condensed water enters the water storage tank, and the equivalent amount of cold water is discharged to the condenser from the water storage tank. Because the total amount of the water entering the deaerator is relatively fixed, the flow entering the water storage tank is increased, the flow passing through the heater is also increased, and the unit power is reduced, and vice versa. Under the heat release mode, one path of condensed water sent by the condensed water pump enters the deaerator through the heater, the other path of condensed water enters the water storage tank, and the equal amount of hot water is pumped to the deaerator from the water storage tank by virtue of the booster pump. Because the total amount of the water entering the deaerator is relatively fixed, the flow pumped out of the water storage tank is increased, the flow passing through the heater is reduced, and the generating power of the unit is increased, and vice versa. The method for improving the climbing rate of the unit by utilizing the heat storage technology of the water storage tank is a novel mode for improving the climbing rate of the unit.
Drawings
Fig. 1 is an overall structure diagram of the heat accumulation peak shaving system of the present invention.
Fig. 2 shows the heat storage condition of the heat storage peak shaving system.
FIG. 3 shows the exothermic conditions of the inventive heat accumulation peak shaving system.
Fig. 4 is a specific embodiment of the heat storage peak shaving system according to the present invention under the heat storage condition.
Fig. 5 is a schematic illustration of an embodiment of the heat storage peak shaving system according to the present invention under heat release conditions.
Fig. 6 is a schematic block diagram of a heat storage mode power conditioning circuit according to the present invention.
FIG. 7 is a schematic block diagram of a heat-release mode power conditioning circuit according to the present invention.
Fig. 8 is a schematic diagram of a specific structure of the valve assembly.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Related terms in the present invention will be first described:
unit regulation rate: the unit can increase or decrease power per minute, and the unit is MW/min.
And the unit coordination control system comprises: the boiler and the steam turbine of the unit are used as controlled objects, so that the boiler and the steam turbine are coordinated and matched to control the change of the generating power of the unit.
Load instruction: and the unit coordinates a target set value which is sent by the control system and responded by the control object.
And the regulating circuit is a closed loop circuit with negative feedback and is used for controlling the executing mechanism to maintain the target parameter at the set value.
PID controller: one of the controllers consists of a proportional unit (P), an integral unit (I) and a differential unit (D).
THA operating mode: the heat rate acceptance condition is one of the operation conditions of the steam turbine, and refers to the power generated by the continuous operation of the steam turbine when the steam turbine is normally operated under the rated air inlet parameter, the rated back pressure and the regenerative system, and the water supplementing rate is 0.
The method is realized in a programming configuration in an existing distributed control system (hereinafter referred to as DCS) of the machine set, and the control of the machine set is realized by matching with an existing control strategy of the machine set. The system specifically comprises a heat storage mode power regulation loop, a heat release mode power regulation loop, a conversion function of power and heat storage and release flow, and a control method of the system under different operation modes. According to different operation modes, only one of the two power regulating loops is put into use at any moment. And after the regulating loop receives a load instruction sent by the unit coordination control system, the regulating loop controls the change of heat storage/release flow of the heat storage system, so that the generating power of the unit is changed.
At present, the applicant proposes a new way for improving the climbing rate of a unit by utilizing a water storage tank heat storage technology to improve the climbing rate of the unit and quickly respond to a power grid dispatching instruction. Because the process system is initiated in China, no matched control strategy exists, the automation of the control process is realized, the process system is an important condition for perfecting and landing the technology, the automation level can be improved, the operation intensity of operators is reduced, and the support is provided for guaranteeing the safe operation of the unit.
The main principle of the heat storage technology of the water storage tank is that the steam turbine drives the rotor to rotate by means of steam to drive the generator to generate electricity. A part of steam in the steam turbine enters the heater through steam extraction to heat the passing condensed water. When the condensation water passing through the heater increases, the extraction amount increases, the steam pushing the turbine to generate electricity decreases, and the power generation is reduced; conversely, when the condensation water passing through the heater is reduced, the extraction amount is reduced, the steam which pushes the turbine to generate electricity is increased, and the power generation is increased. The operation of the system is divided into a heat storage mode and a heat release mode.
As shown in fig. 1 to 3, especially fig. 1, the heat storage peak regulation system of the present invention at least comprises a turbo generator set composed of a generator 1 and a steam turbine 2, and further comprises a heater 3, a deaerator 4, a water storage tank 5, a condenser 6, a condensate pump 7, a booster pump 8, a plurality of valve groups S (S1, S2, S3, S4, S5, S6) and a plurality of pipeline flow detection processing devices F, wherein the condensate pump 7 is connected with the condenser 6.
The condensate pump 7 is connected to a water supply adjusting pipeline 100 of the heat accumulation peak regulation system formed by the heater 3, the heater 3 is connected to the deaerator 4, a first valve set S1 and a first pipeline flow detection processing device F1 are arranged on the water supply adjusting pipeline 100, the heater 3 is connected with the steam turbine 2 for extracting steam, and exchanges heat with condensate water sent to the deaerator 4 by the condensate pump 7.
The heat storage peak shaving system comprises a water storage tank 5, a deaerator 4, a heat storage peak shaving system, a booster pump 8, a heat release branch line 200-1 and a heat storage peak shaving system, wherein a hot water pipeline of the heat storage peak shaving system is formed between the water storage tank 5 and the deaerator 4, and the water storage tank 5 is connected with the booster pump 8 to form the heat release branch line 200-1 of the hot water pipeline. In addition, the heat release branch line is also connected in parallel with a heat storage branch line 200-2, and the hot water pipeline is connected to the deaerator 4 and is provided with a second valve group S2 and a second pipeline flow detection processing device F2.
The condensate pump 7 is connected to the cold water pipeline 300 of the water storage tank 5 to form a heat storage peak shaving system, and a third valve group S3 is arranged on the cold water pipeline 300. The condensate pump 7, the condenser 6 and the water storage tank 5 are mutually communicated, and may be mutually connected through a third valve set S3, that is: the condensate pump 7 is connected with the condenser 6, the condensate pump 7 is connected with the water storage tank 5, and the condenser 6 is connected with the water storage tank 5.
The heat storage mode is shown in fig. 2, please see arrow direction, the water quantity of the condensed water (cold water) sent by the condensed water pump 7 is W0, after passing through the heater 3 (hot water), one path of the condensed water enters the deaerator 4, the water quantity is W1, the other path of the condensed water enters the water storage tank 5 through the heat storage branch line 200-2, the water quantity is W2, and correspondingly, the equivalent quantity of the cold water W2 is discharged from the water storage tank 5 to the condenser 6, wherein w0=w1+w2. Since the total amount (set value) entering the deaerator 4 is relatively fixed, that is, W1 is relatively fixed, the flow W2 entering the water storage tank is increased, the flow W0 passing through the heater is also increased, and the power generation of the generator set is reduced. Conversely, namely: since the total amount (set value) entering the deaerator is relatively fixed, that is, W1 is relatively fixed, the flow W2 entering the water storage tank is reduced, the flow W0 passing through the heater is also reduced, and the power generation of the generator set is increased.
In the heat storage mode, the condensate pump 7 controls the total condensate flow to meet the requirement of the deaerator on the change of the liquid level, and the first valve group S1 controls the liquid level of the deaerator 4 to be at a set value; the second valve group S2 controls the heat storage flow of the heater 3, the heat storage flow is obtained through the second pipeline flow detection processing device F2, the generating power of the unit is changed, the third valve group S3 controls the flow of cold water discharged from the water storage tank 5, and the water level of the water storage tank is maintained at a set value. The schematic block diagram of the heat storage mode power regulation loop is shown in fig. 6, and the regulation loop uses the heat storage flow obtained by the second pipeline flow detection processing device F2 as the regulated quantity and uses the second valve group S2 as the regulated quantity. On the basis of a single-loop control system, a generating power instruction of a unit to be changed is converted into corresponding flow through a function f (x), and then is overlapped with a heat storage flow set value, and the actual heat storage flow is subtracted to be used as the input of a main regulator. The main regulator adopts a PID controller to control the opening degree of a corresponding control valve in the second valve group S2, so that the heat storage flow is changed. When the power command changes, the regulating loop controls the heat storage flow to follow the increase and decrease change, and when the power command is zero, the heat storage flow is restored to the set value of the flow in normal operation.
As shown in fig. 3, in the heat release mode, please see the arrow direction, one path of condensed water sent by the condensed water pump 7 enters the deaerator 4 through the heater 3, the water quantity is W1', the other path of condensed water enters the water storage tank 5 through the cooling pipeline 300, and the water quantity is W2', wherein W0' =w1 ' +w2 '. An equal amount of hot water W2' is pumped from the water storage tank 5 to the deaerator 4 by means of the booster pump 8 via the hot branch line 200-1 of the hot water line described above. Because the total amount (set value) entering the deaerator is relatively fixed, the flow W2 'pumped out of the water storage tank is increased, the flow W1' passing through the heater is reduced, and the generating power of the unit is increased. Conversely, namely: because the total amount (set value) entering the deaerator is relatively fixed, the flow W2 'pumped out of the water storage tank is reduced, the flow W1' passing through the heater is increased, and the generating power of the unit is reduced.
Under the heat release mode, the liquid level of the deaerator 4 is controlled to be at a set value by the second valve group S2, the flow of cold water entering the water storage tank 5 is controlled by the third valve group S3, the water level of the water storage tank 5 is maintained to be at the set value, the total condensate flow is controlled by the condensate pump 7, the requirement of change of the liquid level of the deaerator is met, the flow of the condensate water flowing into the heater is controlled by the first valve group S1, and the flow is obtained by the first pipeline flow detection processing device F1, so that the generating power of a unit is changed. The schematic block diagram of the heat release mode power regulation loop is shown in fig. 7, and the regulation loop uses the condensate flow obtained by the first pipeline flow detection processing device F1 as a regulated quantity and uses the first valve group S1 as a regulated quantity. On the basis of a single-loop control system, a generating power instruction of a unit to be changed is converted into corresponding flow through a function f (x), and then is overlapped with a setting value of the condensate flow, and the actual condensate flow is subtracted to be used as the input of a main regulator. The main regulator adopts a PID controller to control the opening degree of a corresponding control valve in the first valve group S1, thereby changing the condensate flow. When the power command changes, the regulating loop controls the condensate flow to follow the increase and decrease change, and when the power command is zero, the condensate flow is restored to the set value of the flow in normal operation.
Please refer to fig. 4 and fig. 5, which are specific embodiments of the heat storage working condition and the heat release working condition, wherein each valve group includes a plurality of valves with various functions, and each pipeline flow detection processing device can adopt different flow detection principles and devices to realize detection of pipeline flow and remote transmission of flow signals. The valve group is a valve group formed by connecting a plurality of valves in series and parallel, realizes the functions of shutting off, adjusting and isolating pipelines and can be controlled on site or remotely, and specifically, the valve group comprises two parallel branches, a lower main road and an upper branch road, the lower main road is provided with shut-off valves 10 and 11 on two sides and a middle adjusting valve 12, the upper branch road is provided with a bypass shut-off valve 13, the shut-off valve of the lower main road comprises a manual shut-off valve 10 on one side, an electric shut-off valve 11 on the other side and the bypass shut-off valve 13 is generally an electric shut-off valve. The general path of the liquid is from the manual shut-off valve 10 of the lower main path to the intermediate regulating valve 12, to the electric shut-off valve 11, and the liquid can also pass through the bypass shut-off valve 13 to the upper branch path by switching with the upper branch path.
In fig. 4 and 5, the condensate pump 7 is sequentially connected to the first pipeline flow detection processing device F1, the first valve set S1, and the heater 3 to form the water supply adjusting pipeline 100 of the heat accumulation peak shaving system, the heater 3 is connected to the deaerator bus 400, and the deaerator bus 400 is provided with the fourth valve set S4, the fourth pipeline flow detection processing device F4, and the deaerator 4. The first valve set S1 has the same structure as the standard valve set, and the fourth valve set S4 is an electric shut-off valve.
The condensate pump 7 is connected to the water storage tank 5 through the third valve set S3 and the third pipeline flow detection processing device F3, the condensate pump 7 is connected to the condenser 6 through the sixth valve set S6, and the water storage tank 5 is connected to the condenser 6 through the third valve set S3, the third pipeline flow detection processing device F3 and the sixth valve set S6. The water storage tank 5 is connected to the deaerator bus 400 through a booster pump 8, a second valve group S2 and a second pipeline flow detection processing device F2. The two ends of the booster pump 8 are respectively provided with an electric shutoff valve, the booster pump 8 circuit is also connected in parallel with a standby booster pump 81, and two sides of the standby booster pump 81 are provided with the electric shutoff valves. The booster pump 8 is connected in parallel with the fifth valve set S5 and the fifth pipeline flow detection processing device F5, wherein the second valve set S2 is composed of the valve set as standard above, and in order to form the countercurrent to the water storage tank 5 in the fifth valve set S5, the main path below the valve set S5 is an electric shut-off valve, a regulating valve and a manual shut-off valve which are arranged according to the liquid retrograde. The heat release branch line 200-1 of the hot water pipeline is formed by a main line below the water storage tank 5, the booster pump 8, the second pipeline flow detection processing device F2 and the second valve group S2. The heat storage branch line 200-2 of the hot water pipeline is formed by an upper branch line of the second valve group S2, the second pipeline flow detection processing device F2, the fifth pipeline flow detection processing device F5 and the fifth valve group S5. The water supply adjusting pipeline 100 and the hot water pipeline 200 are summarized to the deaerator bus 400 and are connected to the deaerator 4. The heat storage working condition of the heat storage peak shaving system of the scheme is as follows: the condensate pump 7 sends one path of condensate water in the condenser 6 to the deaerator 4 through the heater 3, and the other path of condensate water is sent to the water storage tank 5 through the heat storage branch line 200-2, and then the equivalent amount of cold water is discharged to the condenser 6 from the water storage tank 5;
The heat storage flow obtained by the fifth pipeline flow detection processing device F5 is a regulated quantity, the opening of the fifth valve group S5 is a regulating quantity, a generating power instruction of the unit which needs to be changed is converted into a corresponding flow through a conversion function of power and heat storage and release flow, the corresponding flow is overlapped with a heat storage flow set value, the actual heat storage flow is subtracted and then is used as an input of a main regulator, the opening of the fifth valve group S5 is regulated to obtain a liquid level signal of the deaerator 4 as the regulated quantity, the rotating speed of the condensate pump 7 is the regulating quantity, and the liquid level of the deaerator 4 is maintained at a set value; the regulating valve and the front and back shutoff valves in the first/second/third valve group S1/S2/S3 are closed, and the bypass valve is fully opened; the regulating valve and the front and back shutoff valves in the fifth/sixth valve group S5/S6 are fully opened, and the bypass valve is fully closed; the valve of the fourth valve group S4 is maintained at a certain opening degree; the booster pump 8/81 is stopped and both front and rear valves thereof are closed.
The exothermic conditions of the scheme are as follows: the condensate pump 7 sends out condensate in the condenser 6, one path of the condensate enters the deaerator 4 through the heater 3, the other path of the condensate enters the water storage tank 5 through the cold water pipeline 300, and then the equal amount of hot water is pumped to the deaerator 4 from the water storage tank 5 by virtue of the booster pump 8;
The condensate flow obtained by the first pipeline flow detection processing device F1 is the regulated quantity, the opening of the first valve group S1 is the regulated quantity, the generating power instruction of the unit which needs to be changed is converted into the corresponding flow through the conversion function of power and heat storage and release flow, and then is overlapped with the condensate flow set value, and after the actual condensate flow is subtracted, the condensate flow is used as the input of the main regulator, so that the opening of the first valve group S1 is regulated.
Acquiring a liquid level signal of the deaerator 4 as a regulated quantity, wherein the opening of a regulating valve in the second valve group S2 is the regulated quantity, and maintaining the liquid level of the water storage tank 5 at a set value; acquiring an outlet pressure signal of the booster pump 8/81 as an adjusted quantity, and maintaining the outlet pressure of the booster pump 8/81 at a set value while the rotating speed of the booster pump 8/81 is an adjusted quantity; acquiring a liquid level signal of the water storage tank 5 as a regulated quantity, wherein the opening of a regulating valve in the third valve group S3 is the regulated quantity, and maintaining the liquid level of the water storage tank 5 at a set value; all valves in the fifth/sixth valve group S5/S6 are closed; the regulating valve and the front and back shutoff valves in the first/second/third valve group S1/S2/S3 are fully opened, and the bypass valve is closed; all valves between the condensate pump 7 and the third valve group S3 are opened; the front and rear valves of the booster pump 8/81 are opened; the fourth valve group S4 is fully opened; the condensate pump 7 controls the total condensate flow and meets the requirement of the deaerator for liquid level change.
The conversion of the power instruction and the heat storage flow is very complicated and is influenced by various operation conditions and parameters, and the invention takes calculation data of the change of the power generation power of the unit by different heat storage flows under the 40%THA working condition, the 50%THA working condition, the 75%THA working condition and the 100%THA working condition of the unit as the basis. Through analysis of the calculated data, curve fitting is carried out on the known data by using a least square method, and the corresponding relation between the heat storage flow and the change of the generating power of the unit under different working conditions is obtained:
f(L,P)=（0.0137*L2-2.701*L+194.623）P （1）
wherein the variable L represents the load rate (unit:%) of the unit corresponding to the THA working condition, and P represents the power (unit: MW) required to be regulated. Because the engineering conditions of different units are different, the method can be adopted, and the actual engineering data of the units are adopted for fitting.
The above functions are only one engineering example in the long term, and the results of different working conditions, different data points selected and different mathematical fitting methods are different, so that it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, and all the changes, modifications, substitutions and alterations are within the scope of the claims.
By means of which the system of functions can:
(1) Knowing the current corresponding THA working condition load rate and the current heat storage and release flow, calculating the power regulated by the current heat storage system.
(2) Knowing the current corresponding THA working condition load rate and the current heat storage and release flow, calculating the power range which can be regulated by the heat storage system.
(3) Knowing the current corresponding THA working condition load rate and the power to be regulated, calculating the heat storage and release flow to be changed.
The control method can realize the matched operation of the heat storage system and the original unit, and comprises a heat storage mode power regulation loop, a heat release mode power regulation loop, a conversion function of power and heat storage and release flow, and a control method of the system under different operation modes, wherein the control function is perfect; the programming configuration is realized in the existing DCS of the unit, and the compatibility is good; the power generation power of the unit is regulated, and the corresponding stored heat and heat release flow can be automatically converted according to the power instruction, so that the automatic control of the regulating process is realized, the operation intensity of operators is reduced, and the support is provided for ensuring the safe operation of the unit.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (2)
1. The power control method under the heat storage working condition of the heat storage peak shaving system comprises a main regulator and a steam turbine generator unit, and is characterized in that: the heat accumulation peak shaving system also comprises at least one heater (3), a deaerator (4), a water storage tank (5), a condenser (6), a condensate pump (7), a booster pump (8) and a plurality of valve groups, wherein the valve groups comprise a lower main path and an upper bypass, and the lower main path comprises shutoff valves at two ends and a regulating valve in the middle;
The water supply regulating pipeline (100) is connected to the deaerator (4), a first valve group (S1) and a first pipeline flow detection processing device (F1) are arranged on the water supply regulating pipeline (100), and the heater (3) is connected to the turbo generator set;
The heat accumulation peak shaving system comprises a water storage tank (5), a deaerator (4), a heat accumulation peak shaving system and a booster pump (8), wherein the water storage tank (5) is connected with the hot water pipeline, the booster pump (8) is connected with a second pipeline flow detection processing device (F2) and a second valve group (S2), and the second valve group (S2) comprises a lower main path and an upper bypass; the booster pump (8) is connected in parallel with a branch line comprising a fifth pipeline flow detection processing device (F5) and a fifth valve group (S5), a heat release branch line (200-1) of a hot water pipeline is formed by a main line below the booster pump (8), the second pipeline flow detection processing device (F2) and the second valve group (S2), a bypass above the second valve group (S2), the second pipeline flow detection processing device (F2), the fifth pipeline flow detection processing device (F5) and the fifth valve group (S5) form a heat storage branch line (200-2) of the hot water pipeline, the hot water pipeline is finally connected to the deaerator (4), and a main line (400) where the deaerator (4) is positioned is provided with a fourth valve group (S4) and a fourth pipeline flow detection processing device (F4);
The condensate pump (7) is connected to the water storage tank (5) through a third valve group (S3) and a third pipeline flow detection processing device (F3), the condensate pump (7) is connected to the condenser (6) through a sixth valve group (S6), and the water storage tank (5) is connected to the condenser (6) through the third valve group (S3), the third pipeline flow detection processing device (F3) and the sixth valve group (S6);
The heat storage working condition of the heat storage peak shaving system is as follows: the condensate pump (7) sends condensate in the condenser (6) to the deaerator (4) through the heater (3), and sends the condensate to the water storage tank (5) through the heat storage branch line (200-2), and then the equivalent amount of cold water is discharged to the condenser (6) from the water storage tank (5);
the heat storage flow obtained by the fifth pipeline flow detection processing device (F5) is the regulated quantity, the opening in the fifth valve group (S5) is the regulated quantity, the generating power instruction of the unit to be changed is converted into the corresponding flow through the conversion function of the power and the heat storage and release flow, the corresponding flow is overlapped with the heat storage flow set value, the actual heat storage flow is subtracted, and the heat storage flow is used as the input of the main regulator, so that the opening of the fifth valve group (S5) is regulated;
The method comprises the steps of obtaining a liquid level signal of a deaerator (4) as a regulated quantity, obtaining a rotating speed of a condensate pump (7) as a regulated quantity, and maintaining the liquid level of the deaerator (4) at a set value, obtaining a liquid level signal of a water storage tank (5) as the regulated quantity, and maintaining the liquid level of the water storage tank (5) at the set value by using an opening degree of a regulating valve in a sixth valve group (S6) as the regulated quantity; the regulating valve and the front and back shutoff valves in the first/second/third valve group (S1/S2/S3) are closed, and the bypass valve is fully opened; the regulating valve and the front and back shutoff valves in the fifth/sixth valve group (S5/S6) are fully opened, and the bypass valve is fully closed; the valve of the fourth valve group (S4) is maintained at a certain opening degree; the booster pump (8) is stopped, and the front valve and the rear valve of the booster pump are closed;
the method comprises the steps of taking calculation data or engineering actual measurement data of the change of the generating power of the unit under a plurality of typical working conditions of the unit as a basis, and carrying out curve fitting on known data through analysis of the calculation data to obtain the corresponding relation between the heat storage flow and the change of the generating power of the unit under different working conditions;
The conversion function of the power and the heat storage and release flow adopts the following formula:
f(L,P)=（0.0137*L2-2.701*L+194.623）P
Wherein, the variable L represents the load rate (unit:%) of the unit corresponding to the THA working condition, and P represents the power (unit: MW) required to be regulated.
2. The power control method under the exothermic working condition of the heat storage peak shaving system comprises a main regulator and a generator set, and is characterized in that: the heat accumulation peak shaving system also comprises at least one heater (3), a deaerator (4), a water storage tank (5), a condenser (6), a condensate pump (7), a booster pump (8) and a plurality of valve groups, wherein the valve groups comprise a lower main path and an upper bypass, and the lower main path comprises shutoff valves at two ends and a regulating valve in the middle;
The water supply regulating pipeline (100) is connected to the deaerator (4), a first valve group (S1) and a first pipeline flow detection processing device (F1) are arranged on the water supply regulating pipeline (100), and the heater (3) is connected to the turbo generator set;
The heat accumulation peak shaving system comprises a water storage tank (5), a deaerator (4), a heat accumulation peak shaving system and a booster pump (8), wherein the water storage tank (5) is connected with the hot water pipeline, the booster pump (8) is connected with a second pipeline flow detection processing device (F2) and a second valve group (S2), and the second valve group (S2) comprises a lower main path and an upper bypass; the booster pump (8) is connected in parallel with a branch line comprising a fifth pipeline flow detection processing device (F5) and a fifth valve group (S5), a heat release branch line (200-1) of a hot water pipeline is formed by a main line below the booster pump (8), the second pipeline flow detection processing device (F2) and the second valve group (S2), a bypass above the second valve group (S2), the second pipeline flow detection processing device (F2), the fifth pipeline flow detection processing device (F5) and the fifth valve group (S5) form a heat storage branch line (200-2) of the hot water pipeline, the hot water pipeline is finally connected to the deaerator (4), and a main line (400) where the deaerator (4) is positioned is provided with a fourth valve group (S4) and a fourth pipeline flow detection processing device (F4);
The condensate pump (7) is connected to the water storage tank (5) through a third valve group (S3) and a third pipeline flow detection processing device (F3), the condensate pump (7) is connected to the condenser (6) through a sixth valve group (S6), and the water storage tank (5) is connected to the condenser (6) through the third valve group (S3), the third pipeline flow detection processing device (F3) and the sixth valve group (S6);
The exothermic conditions are as follows: the condensate pump (7) sends out condensate in the condenser (6), one path of the condensate enters the deaerator (4) through the heater (3), the other path of the condensate enters the water storage tank (5) through the cold water pipeline (300), and then the equal amount of hot water is pumped to the deaerator (4) from the water storage tank (5) by virtue of the booster pump (8);
The method comprises the steps that the condensate flow obtained by a first pipeline flow detection processing device (F1) is the regulated quantity, the opening of a first valve group (S1) is the regulated quantity, a generating power command of a unit to be changed is converted into a corresponding flow through a conversion function of power and heat storage and release flow, the corresponding flow is overlapped with a condensate flow set value, and the actual condensate flow is subtracted to serve as the input of a main regulator, so that the opening of the first valve group (S1) is regulated;
The liquid level signal of the deaerator (4) is obtained as a regulated quantity, the opening of a regulating valve in the second valve group (S2) is the regulated quantity, and the liquid level of the water storage tank (5) is maintained at a set value; acquiring an outlet pressure signal of a booster pump (8) as an adjusted quantity, wherein the rotating speed of the booster pump (8) is an adjusted quantity, and maintaining the outlet pressure of the booster pump (8) at a set value; acquiring a liquid level signal of the water storage tank (5) as a regulated quantity, wherein the opening of a regulating valve in the third valve group (S3) is the regulated quantity, and maintaining the liquid level of the water storage tank (5) at a set value; all valves in the fifth/sixth valve group (S5/S6) are closed; the regulating valve and the front and back shutoff valves in the first/second/third valve group (S1/S2/S3) are fully opened, and the bypass valve is closed; all valves between the condensate pump (7) and the third valve group S3 are opened; the front valve and the rear valve of the booster pump (8) are opened; the fourth valve group (S4) is fully opened; the condensate pump (7) controls the total condensate flow and meets the requirement of the deaerator on the liquid level change;
the method comprises the steps of taking calculation data or engineering actual measurement data of the change of the generating power of the unit under a plurality of typical working conditions of the unit as a basis, and carrying out curve fitting on known data through analysis of the calculation data to obtain the corresponding relation between the heat storage flow and the change of the generating power of the unit under different working conditions;
The conversion function of the power and the heat storage and release flow adopts the following formula:
f(L,P)=（0.0137*L2-2.701*L+194.623）P
Wherein, the variable L represents the load rate (unit:%) of the unit corresponding to the THA working condition, and P represents the power (unit: MW) required to be regulated.
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