CN111412453A - Power control method under heat storage and release working condition of heat storage peak regulation system - Google Patents
Power control method under heat storage and release working condition of heat storage peak regulation system Download PDFInfo
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- CN111412453A CN111412453A CN202010282279.2A CN202010282279A CN111412453A CN 111412453 A CN111412453 A CN 111412453A CN 202010282279 A CN202010282279 A CN 202010282279A CN 111412453 A CN111412453 A CN 111412453A
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- 238000005338 heat storage Methods 0.000 title claims abstract description 120
- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000033228 biological regulation Effects 0.000 title claims description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 192
- 238000001514 detection method Methods 0.000 claims description 61
- 238000012545 processing Methods 0.000 claims description 59
- 230000001105 regulatory effect Effects 0.000 claims description 59
- 239000007788 liquid Substances 0.000 claims description 27
- 230000008859 change Effects 0.000 claims description 19
- 238000006243 chemical reaction Methods 0.000 claims description 13
- 238000010248 power generation Methods 0.000 claims description 11
- 238000009825 accumulation Methods 0.000 claims description 8
- 230000001276 controlling effect Effects 0.000 claims description 4
- 238000004458 analytical method Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 6
- 230000009194 climbing Effects 0.000 abstract description 2
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- 238000005457 optimization Methods 0.000 description 2
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- 230000005540 biological transmission Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
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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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Abstract
The invention provides a power control method under the working condition of heat storage and heat release of a heat storage peak shaving system, which comprises the heat storage peak shaving system. 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, the generating power of the unit is reduced, and vice versa. Under the heat release mode, the condensate water that condensate pump sent out gets into the oxygen-eliminating device through the heater all the way, and another way gets into the water storage tank, and equivalent hot water relies on the booster pump to be pumped to the oxygen-eliminating device by the water storage tank. Because the total amount of the water entering the deaerator is relatively fixed, the flow pumped out by the water storage tank is increased, the flow passing through the heater is reduced, the generating power of the unit is increased, and vice versa. The applicant provides a new way for improving the climbing speed of the unit by utilizing the heat storage technology of the water storage tank and quickly responding to the power grid dispatching instruction.
Description
Technical Field
The invention relates to the field of peak shaving of thermal power generation technology, in particular to a heat storage peak shaving system and a control method thereof.
Background
In order to meet the requirement of rapid development of renewable energy sources and improve the consumption capacity of the renewable energy sources, the flexibility of a power grid needs to be improved urgently. Wherein the flexibility of load adjustment includes: deep peak regulation (low-load operation of a boiler and a steam turbine), quick start and stop of a unit, ramp rate of the unit and thermoelectric decoupling of a cogeneration unit.
At present, the generating power of a unit is quickly adjusted, and the heat storage capacity of a boiler is released in a short time mainly by using a steam inlet valve of a steam turbine; the condensate throttling optimization mode changes the flow of the condensate passing through the heater in a short time.
Although the heat storage capacity of the boiler can quickly respond to the dispatching instruction, the heat storage capacity is limited, the output of the unit can be increased only in a short time, and the pressure of the main steam is greatly fluctuated. The condensate throttling optimization mode is characterized in that the flow of a condensate regulating valve is reduced, the self-balancing capacity of a low-pressure heater of the unit is relied on, the output electric power of the steam turbine is increased, the water level of the deaerator and the water level of the condenser can be greatly disturbed when the flow of the condensate is greatly changed, the safe operation of the unit can be influenced by changing the flow of the condensate for a long time, and the sustainable capacity cannot be guaranteed.
Disclosure of Invention
The invention designs a power control method under the heat storage working condition of a heat storage peak shaving system and a power control method under the heat release working condition of the heat storage peak shaving system, realizes the quick adjustment of the power generation power of a thermal power generating set (hereinafter referred to as a set) by controlling the heat storage flow and the heat release flow of the heat storage system, and improves the adjustment rate of the set, thereby increasing the capacity of the set participating in the peak shaving and frequency modulation of a power grid.
The invention firstly provides a power control method of a heat storage peak regulation system under a heat storage working condition, wherein the heat storage peak regulation system comprises a main regulator and a steam turbine generator unit, wherein: the heat storage peak regulation 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 each valve group comprises 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 condensed water pump is connected to a heater to form a water supply adjusting pipeline of the heat storage peak regulation system, the heater is connected to a deaerator, a first valve group and a first pipeline flow detection processing device are arranged on the water supply adjusting pipeline, and the heater is connected to a turbo generator unit;
the system comprises a water storage tank, a deaerator, a first pipeline flow detection processing device, a second valve group and a control system, wherein a hot water pipeline of a heat storage peak regulation system is formed between the water storage tank and the deaerator; the booster pump is connected with a branch line comprising a fifth pipeline flow detection processing device and a fifth valve group in parallel, the booster pump, the second pipeline flow detection processing device and a main line below the second valve group form a heat release branch line of the hot water pipeline, an upper bypass of the second valve group, the second pipeline flow detection processing device, the fifth pipeline flow detection processing device and the fifth valve group form a heat storage branch line of the hot water pipeline, the hot water pipeline is finally connected to a deaerator, and a fourth valve group and a fourth pipeline flow detection processing device are arranged on the main line where the deaerator is located;
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 regulation system is as follows: one path of condensed water in the condenser is sent to the deaerator through the heater by the condensed water pump, the other path of condensed water is sent to the water storage tank through the heat storage branch line, and then, the same amount of cold water is discharged to the condenser from the water storage tank;
the heat storage flow acquired by the fifth pipeline flow detection processing device is regulated, the opening of the fifth valve group is regulated, a unit power generation power instruction needing to be changed is converted into corresponding flow through a conversion function of power and heat storage and release flow, the corresponding flow is superposed with a heat storage flow set value, and the heat storage flow is subtracted to be used as the input of a main regulator, so that the opening of the fifth valve group is regulated.
Wherein: acquiring a liquid level signal of a water storage tank as the regulated quantity, and an opening degree of a regulating valve in a sixth valve group as the regulated quantity, and maintaining the liquid level of the water storage tank at the 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 rear shutoff valves in the fifth/sixth valve group are fully opened, and the bypass valve is fully closed; the fourth valve group valve is maintained at a certain opening degree; the booster pump stops, and the front valve and the rear valve of the booster pump are closed.
The method comprises the steps of obtaining corresponding relations between heat storage flow and unit generating power changes under different working conditions by analyzing calculated data and performing curve fitting on known data according to calculated data or engineering measured data of the unit on which the different heat storage flows change the generating power of the unit under the typical 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) to be regulated.
The invention also provides a power control method under the heat release working condition of the heat storage peak regulation system, wherein the heat storage peak regulation system comprises a main regulator and a generator set, wherein: the heat storage peak regulation 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 each valve group comprises 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 condensed water pump is connected to a heater to form a water supply adjusting pipeline of the heat storage peak regulation system, the heater is connected to a deaerator, a first valve group and a first pipeline flow detection processing device are arranged on the water supply adjusting pipeline, and the heater is connected to a turbo generator unit;
the system comprises a water storage tank, a deaerator, a first pipeline flow detection processing device, a second valve group and a control system, wherein a hot water pipeline of a heat storage peak regulation system is formed between the water storage tank and the deaerator; the booster pump is connected with a branch line comprising a fifth pipeline flow detection processing device and a fifth valve group in parallel, the booster pump, the second pipeline flow detection processing device and a main line below the second valve group form a heat release branch line of the hot water pipeline, an upper bypass of the second valve group, the second pipeline flow detection processing device, the fifth pipeline flow detection processing device and the fifth valve group form a heat storage branch line of the hot water pipeline, the hot water pipeline is finally connected to a deaerator, and a fourth valve group and a fourth pipeline flow detection processing device are arranged on the main line where the deaerator is located;
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 release working condition is as follows: the condensed water pump sends out condensed water in the condenser, one path of the condensed water enters the deaerator through the heater, the other path of the condensed water enters the water storage tank through the cold water pipeline, and then equivalent hot water is pumped to the deaerator from the water storage tank by the booster pump;
the condensate flow acquired by the first pipeline flow detection processing device is regulated, the opening of the first valve group is regulated, a unit power generation power instruction needing to be changed is converted into corresponding flow through a conversion function of power and heat storage flow, the corresponding flow is superposed with a condensate flow set value, and the superposed flow is used as the input of a main regulator after the actual condensate flow is subtracted, so that the opening of the first valve group is regulated.
Wherein: acquiring a liquid level signal of the deaerator as an adjusted quantity, and maintaining the liquid level of the water storage tank at a set value, wherein the opening degree of an adjusting valve in the second valve group is the adjusted quantity; acquiring a booster pump outlet pressure signal as a regulated quantity, and maintaining the booster pump outlet pressure at a set value, wherein the booster pump rotating speed is a regulated quantity; acquiring a liquid level signal of the water storage tank as an adjusted quantity, and maintaining the liquid level of the water storage tank at a set value by using the opening degree of an adjusting valve in a third valve group as an adjusted quantity; all valves in the fifth/sixth valve group are closed; the regulating valve and the front and rear shutoff valves in the first/second/third valve group are fully opened, and the bypass valve is closed; all valves from the condensate pump to the third valve group are opened; both front and rear valves of the booster pump are opened; the fourth valve group is fully opened; the condensate pump controls the total condensate flow to meet the requirement of the deaerator for liquid level change.
Wherein: according to the method, under the typical working conditions of the unit, calculated data or engineering measured data of the change of the generating power of the unit caused by different heat storage flows are used as the basis, and curve fitting is carried out on known data through analysis of the calculated data, so that the corresponding relation between the heat storage flows and the change of the generating power of the unit under the 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) to be regulated.
The invention has the beneficial effects that: under the heat storage mode, condensed water (cold water) sent by a condensed water pump passes through a heater (hot water), one path of the condensed water enters a deaerator, the other path of the condensed water enters a water storage tank, and the equivalent amount of the 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, the generating power of the unit is reduced, and vice versa. Under the heat release mode, the condensate water that condensate pump sent out gets into the oxygen-eliminating device through the heater all the way, and another way gets into the water storage tank, and equivalent hot water relies on the booster pump to be pumped to the oxygen-eliminating device by the water storage tank. Because the total amount of the water entering the deaerator is relatively fixed, the flow pumped out by the water storage tank is increased, the flow passing through the heater is reduced, the generating power of the unit is increased, and vice versa. The applicant provides a new way for improving the climbing speed of the unit by utilizing the heat storage technology of the water storage tank and quickly responding to the power grid dispatching instruction.
Drawings
Fig. 1 is an overall structural view of the regenerative peak shaving system of the present invention.
Fig. 2 shows the heat storage condition of the heat storage peak shaving system of the invention.
FIG. 3 shows the heat release condition of the thermal storage peak shaving system of the invention.
Fig. 4 shows a specific embodiment of the heat storage peak shaving system according to the present invention under the heat storage condition.
Fig. 5 shows an embodiment of the heat-storing peak-shaving system according to the present invention under the heat-releasing condition.
FIG. 6 is a schematic block diagram of a heat storage type power conditioning circuit according to the present invention.
FIG. 7 is a schematic block diagram of a heat-release power conditioning circuit of the present invention.
Fig. 8 is a schematic diagram of a specific structure of the valve set.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
First, the related terms in the present invention are introduced:
the unit adjusting rate: the unit can increase or decrease power per minute in MW/min.
The unit coordination control system: the boiler and the steam turbine of the unit are used as controlled objects, and the boiler and the steam turbine are coordinated and matched to control the change of the generating power of the unit.
And (3) load instruction: and the set coordination control system sends out a target set value for controlling the response of the object.
The adjusting loop is a closed loop with negative feedback and controls the actuating mechanism to maintain the target parameter at a set value.
A PID controller: one type of controller consists of a proportional unit (P), an integral unit (I) and a differential unit (D).
THA working condition: the heat consumption 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 under the rated air inlet parameter, the rated back pressure and the normal operation of a regenerative system, wherein the water replenishing rate is 0.
The method is realized by programming configuration in the existing distributed control system (hereinafter referred to as DCS) of the unit, and the control of the unit is realized by matching with the existing control strategy of the unit. The system specifically comprises a heat storage mode power regulating circuit, a heat release mode power regulating circuit, a conversion function of power and heat storage and release flow and control methods of the system in different operation modes. According to different operation modes, only one of the two power regulating loops is used at any time. And when the regulating loop receives a load instruction sent by the unit coordination control system, the change of the heat storage/release flow of the heat storage system is controlled, so that the generating power of the unit is changed.
At present, the applicant provides a new way for improving the ramp rate of a unit by utilizing a water storage tank heat storage technology and quickly responding to a power grid dispatching instruction. The process system is initiated in China, has no matched control strategy, realizes automation of the control process, is an important condition for perfecting and landing the technology, can improve the automation level, reduce the operation intensity of operators and provide support for ensuring safe operation of the unit.
The main principle of the water storage tank heat storage technology is that a steam turbine drives a rotor to rotate by means of steam to drive a generator to generate electricity. A part of steam in the steam turbine enters the heater through extraction steam to heat passing condensed water. When the amount of condensed water passing through the heater is increased, the extraction steam amount is increased, the steam for pushing the steam turbine to generate power is reduced, and the power generation power is reduced; on the contrary, when the amount of the condensed water passing through the heater is reduced, the extraction amount is reduced, the steam for pushing the steam turbine to generate power is increased, and the power generation power is increased. The system operation is divided into a heat storage mode and a heat release mode.
As shown in fig. 1 to 3, especially fig. 1, the heat accumulation peak shaving system of the present invention at least includes a turbo generator unit composed of a generator 1 and a turbine 2, and further includes 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 sets S (S1, S2, S3, S4, S5, S6), and a plurality of pipeline flow rate detection processing devices F, wherein the condensate pump 7 is connected to the condenser 6.
The condensed water pump 7 is connected to a water supply adjusting pipeline 100 of the heater 3 to form a heat storage peak shaving system, the heater 3 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 adjusting pipeline 100, the heater 3 is connected with the steam turbine 2 to extract steam, and the steam and the condensed water sent to the deaerator 4 by the condensed water pump 7 exchange heat.
Wherein, a hot water pipeline of a heat accumulation peak regulation system is formed between the water storage tank 5 and the deaerator 4, and the water storage tank 5 is connected with a booster pump 8 to form a heat release branch line 200-1 of the hot water pipeline. In addition, the heat release branch line is also connected with a heat storage branch line 200-2 in parallel, the hot water pipeline is connected to the deaerator 4, and the hot water pipeline is provided with a second valve group S2 and a second pipeline flow detection processing device F2.
Wherein the condensate pump 7 is connected to the cold water pipeline 300 of the water storage tank 5 to form a heat accumulation peak shaving system, and the cold water pipeline 300 is provided with a third valve set S3. The condensate pump 7, the condenser 6 and the water storage tank 5 are communicated with each other, and can be connected with each other through a third valve set S3, namely: 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.
Referring to fig. 2, the amount of the condensed water (cold water) sent by the condensed water pump 7 in the arrow direction is W0, and after passing through the heater 3 (hot water), one path enters the deaerator 4 with the amount of W1, and the other path enters the water storage tank 5 through the heat storage branch line 200-2 with the amount of W2, and accordingly, the same amount of the cold water W2 is discharged from the water storage tank 5 to the condenser 6, wherein W0= W1+ W2. Because the total amount (set value) entering the deaerator 4 is relatively fixed, namely 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 efficiency of the generator set is reduced. Otherwise, the following steps are carried out: because the total amount (set value) entering the deaerator is relatively fixed, namely W1 is relatively fixed, the flow W2 entering the water storage tank is reduced, the flow W0 passing through the heater is reduced, and the power generation rate 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 liquid level change, 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 rate of the heater 3, which is obtained by the second line flow rate detection processing device F2 to change the power generated by the unit, and the third valve group S3 controls the flow rate of cold water discharged from the water storage tank 5 to maintain the water level of the water storage tank at a set value. Fig. 6 is a schematic block diagram of a heat storage type power control circuit, which uses the heat storage flow rate obtained by the second line flow rate detection processing device F2 as a controlled variable and uses the second valve group S2 as a controlled variable. On the basis of a single-loop control system, a generating power command of a unit needing to be changed is converted into corresponding flow through a function f (x), and then is superposed with a heat storage flow set value, and the 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 the corresponding control valve in the second valve group S2, thereby changing the heat storage flow. When the power instruction changes, the regulating circuit controls the heat storage flow to change along with increase and decrease, and when the power instruction is zero, the heat storage flow is restored to the set value of the flow during normal operation.
Referring to the arrow direction shown in fig. 3, one path of the condensed water sent by the condensed water pump 7 enters the deaerator 4 through the heater 3, and the water amount is W1 ', and the other path of the condensed water enters the water storage tank 5 through the cold pipeline 300, and the water amount is W2 ', where W0 ' = W1 ' + W2 '. An equal amount of hot water W2' is pumped by means of a booster pump 8 from the water storage tank 5 to the deaerator 4 through the hot branch 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 by the water storage tank is increased, the flow W1' passing through the heater is reduced, and the generating power of the unit is increased. Otherwise, the following steps are carried out: because the total amount (set value) entering the deaerator is relatively fixed, the flow W2 'pumped out by 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 cold water flow 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 at the set value, the total condensed water flow is controlled by the condensed water pump 7, the requirement of liquid level change of the deaerator is met, the flow of the condensed water flowing into the heater is controlled by the first valve group S1, and the condensed water is obtained through the first pipeline flow detection processing device F1, so that the generating power of the unit is changed. Fig. 7 is a schematic block diagram of a heat-releasing type power control circuit in which the flow rate of the condensate obtained by the first line flow rate detection processing device F1 is controlled and the first valve group S1 is controlled. On the basis of a single-loop control system, a unit generating power instruction needing to be changed is converted into corresponding flow through a function f (x), and then is superposed with a condensate flow set value, and the superposed flow is used as the input of a main regulator after the actual condensate flow is subtracted. The main regulator uses a PID controller to control the opening of the corresponding control valve in the first valve set S1, thereby changing the flow of condensate. When the power instruction changes, the regulating circuit controls the condensate flow to change along with increase and decrease, and when the power instruction is zero, the condensate flow is restored to the set value of the flow during normal operation.
Please refer to fig. 4 and fig. 5, which are specific embodiments under the heat storage condition and the heat release condition, respectively, wherein each valve set includes a plurality of valves with each function, and each pipeline flow detection processing device can adopt different flow detection principles and devices to realize the detection of the pipeline flow and the remote transmission of the flow signal. Specifically, the present embodiment includes two parallel branches, a lower main branch and an upper branch, the lower main branch is provided with two shut-off valves 10 and 11 at two sides and a middle regulating valve 12, the upper branch is provided with a bypass shut-off valve 13, the shut-off valve of the lower main branch includes a manual shut-off valve 10 at one side, an electric shut-off valve 11 at 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 a manual shutoff valve 10 of a lower main path to a middle regulating valve 12 and then to an electric shutoff valve 11, or can be switched with an upper branch path to go to the upper branch path through a bypass shutoff valve 13.
In fig. 4 and 5, the condensate pump 7 is sequentially connected to a first pipeline flow detection processing device F1, a first valve group S1, and a heater 3 to form a water supply adjusting pipeline 100 of the thermal storage peak shaving system, the heater 3 is connected to a deaerator bus 400, and the deaerator bus 400 is provided with a fourth valve group S4, a fourth pipeline flow detection processing device F4, and a deaerator 4. The first valve set S1 has the same structure as the standard valve set, and the fourth valve set S4 is an electrically operated shutoff valve.
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 a third valve group S3, a third pipeline flow detection processing device F3 and a sixth valve group S6. The water storage tank 5 is connected to the deaerator bus 400 through the booster pump 8, the second valve group S2 and the second pipeline flow detection processing device F2. The both ends of booster pump 8 are provided with electronic shutoff valve respectively, just 8 parallelly connected reserve booster pumps 81 of booster pump still, reserve booster pump 81 both sides are provided with electronic shutoff valve. The booster pump 8 is connected in parallel with a fifth valve group S5 and a fifth pipeline flow detection processing device F5, wherein the second valve group S2 is composed of the valve group of the standard, the fifth valve group S5 is used for forming the counter flow to the water storage tank 5, and a main circuit below S5 is an electric shutoff valve, a regulating valve and a manual shutoff valve which are arranged according to the liquid reverse running mode. The heat release branch line 200-1 of the hot water line is formed by the lower main line of the water storage tank 5, the booster pump 8, the second line flow rate detection processing device F2 and the second valve group S2. The hot water storage branch line 200-2 is formed by the upper branch of the second valve set S2, the second pipeline flow detection processing device F2, the fifth pipeline flow detection processing device F5 and the fifth valve set S5. The water supply adjusting pipeline 100 and the hot water pipeline 200 are collected to a deaerator bus 400 and are connected to a deaerator 4. The heat storage working condition of the heat storage peak regulation system in the scheme is as follows: one path of condensed water in the condenser 6 is conveyed to the deaerator 4 through the heater 3 by the condensed water pump 7, the other path of condensed water is conveyed to the water storage tank 5 through the heat storage branch line 200-2, and then, the same amount of cold water is discharged to the condenser 6 from the water storage tank 5;
the heat storage flow acquired by the fifth pipeline flow detection processing device F5 is a regulated flow, the opening in the fifth valve group S5 is a regulated flow, a unit power generation power instruction needing to be changed is converted into a corresponding flow through a conversion function of power and heat storage and storage flow, the corresponding flow is superposed with a heat storage flow set value, the superposed flow is used as the input of a main regulator after the actual heat storage flow is subtracted, the opening of the fifth valve group S5 is further regulated to acquire a liquid level signal of the deaerator 4 as the regulated flow, the rotating speed of the condensate pump 7 is the regulated flow, and the liquid level of the deaerator 4 is maintained at the 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 rear shutoff valves in the fifth/sixth valve group S5/S6 are fully opened, and the bypass valve is fully closed; the fourth valve group S4 is maintained at a certain opening; the booster pump 8/81 is stopped with both front and rear valves closed.
The heat release working condition of the scheme is 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 equivalent hot water is pumped to the deaerator 4 from the water storage tank 5 by the booster pump 8;
the condensate flow obtained by the first pipeline flow detection processing device F1 is regulated, the opening of the first valve group S1 is regulated, the generated power command of the unit needing to be changed is converted into corresponding flow through a conversion function of power and heat storage and release flow, the corresponding flow is superposed with a condensate flow set value, and the superposed flow is used as the input of a main regulator after the actual condensate flow is subtracted, so that the opening of the first valve group (S1) is regulated.
Acquiring a liquid level signal of the deaerator 4 as an adjusted quantity, and maintaining the liquid level of the water storage tank 5 at a set value by using the opening degree of an adjusting valve in a second valve group S2 as an adjusted quantity; acquiring a signal of the outlet pressure of the booster pump 8/81 as a regulated quantity, and the rotating speed of the booster pump 8/81 as a regulated quantity, and maintaining the outlet pressure of the booster pump 8/81 at a set value; acquiring a liquid level signal of the water storage tank 5 as an adjusted quantity, and maintaining the liquid level of the water storage tank 5 at a set value by using the opening degree of an adjusting valve in a third valve group S3 as an adjusted quantity; 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 from the condensate pump 7 to the third valve group S3 are opened; 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 to meet the requirement of the deaerator for liquid level change.
The conversion of the power instruction and the heat storage flow is very complex and is influenced by various operation conditions and parameters, and the method is based on the calculation data of the change of the generating power of the unit caused by different heat storage flows under the 40% THA condition, the 50% THA condition, the 75% THA condition and the 100% THA condition of the unit. By analyzing the calculated data and utilizing a least square method, curve fitting is carried out on the known data, 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）
the variable L represents the load rate (unit:%) of the unit corresponding to the THA working condition, and P represents the power (unit: MW) to be adjusted.
The above-described function is only an engineering example, and the results of different working conditions, different data points, different mathematical fitting methods are different, and it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the present invention, and all of them fall within the scope of the appended claims.
Through the function system, the following functions can be performed:
(1) and (4) knowing the current corresponding THA working condition load rate and the current heat storage and release flow, and calculating the current power regulated by the heat storage system.
(2) And (4) calculating the adjustable power range of the heat storage system according to the current corresponding THA working condition load rate and the current heat storage and release flow.
(3) And (4) calculating the heat storage and release flow needing to be changed according to the current corresponding THA working condition load rate and the power needing to be adjusted.
The control method can realize the matched operation of the heat storage system and the original unit, comprises a heat storage mode power adjusting loop, a heat release mode power adjusting loop, a conversion function of power and heat storage and release flow and control methods of the system under different operation modes, and has perfect control function; the programming configuration is realized in the existing DCS of the unit, and the compatibility is good; the generated power of the unit is adjusted, and the corresponding storage and heat release flow can be automatically converted according to the power instruction, so that the automatic control of the adjusting 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 appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The power control method of the heat accumulation peak shaving system under the heat accumulation working condition, wherein the heat accumulation peak shaving system comprises a main regulator and a steam turbine generator unit, characterized in that: the heat storage peak regulation 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 sets, wherein each valve set comprises a lower main path and an upper bypass, and the lower main path comprises shut-off valves at two ends and a regulating valve in the middle;
the condensed water pump (7) is connected to the heater (3) to form a water supply adjusting pipeline (100) of the heat storage peak shaving system, the heater (3) 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 adjusting pipeline (100), and the heater (3) is connected to the turbo generator unit;
a hot water pipeline of a heat accumulation peak shaving system is formed between the water storage tank (5) and the deaerator (4), the water storage tank (5) is connected with a booster pump (8), 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 with a branch line comprising a fifth pipeline flow detection processing device (F5) and a fifth valve group (S5) in parallel, a heat release branch line (200-1) of the hot water pipeline is formed by the booster pump (8), the second pipeline flow detection processing device (F2) and a main line below the second valve group (S2), an upper bypass 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) form a branch line heat storage (200-2) of the hot water pipeline, the hot water pipeline is finally connected to the deaerator (4), and a fourth valve group (S4) and a fourth pipeline flow detection processing device (F4) are arranged on a main line (400) where the deaerator (4) is located;
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 regulation system is as follows: one path of condensed water in the condenser (6) is conveyed to the deaerator (4) through the heater (3) by the condensed water pump (7), the other path of condensed water is conveyed to the water storage tank (5) through the heat storage branch line (200-2), and then the same 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 regulated, the opening in the fifth valve group (S5) is regulated, a unit power generation power command needing to be changed is converted into corresponding flow through a conversion function of power and heat storage and storage flow, the corresponding flow is superposed with a heat storage flow set value, and the heat storage flow is subtracted to be used as the input of a main regulator, so that the opening of the fifth valve group (S5) is regulated.
2. The power control method of claim 1 under the heat storage condition of the heat storage peak shaving system, characterized in that: acquiring a liquid level signal of a deaerator (4) as a regulated quantity, 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; 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 rear shutoff valves in the fifth/sixth valve group (S5/S6) are fully opened, and the bypass valve is fully closed; the fourth valve group (S4) maintains the valves at a certain opening degree; the booster pump (8/81) is stopped with both front and rear valves closed.
3. The power control method of claim 2 under the heat storage condition of the heat storage peak shaving system, characterized in that: according to the method, under the typical working conditions of the unit, calculated data or engineering measured data of the change of the generating power of the unit caused by different heat storage flows are used as the basis, and curve fitting is carried out on known data through analysis of the calculated data, so that the corresponding relation between the heat storage flows and the change of the generating power of the unit under the different working conditions is obtained.
4. The power control method of claim 3 under the heat storage condition of the heat storage peak shaving system, characterized in that: 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) to be regulated.
5. The power control method under the heat release working condition of the heat storage peak regulation system, wherein the heat storage peak regulation system comprises a main regulator and a generator set, and is characterized in that: the heat storage peak regulation 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 sets, wherein each valve set comprises a lower main path and an upper bypass, and the lower main path comprises shut-off valves at two ends and a regulating valve in the middle;
the condensed water pump (7) is connected to the heater (3) to form a water supply adjusting pipeline (100) of the heat storage peak shaving system, the heater (3) 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 adjusting pipeline (100), and the heater (3) is connected to the turbo generator unit;
a hot water pipeline of a heat accumulation peak shaving system is formed between the water storage tank (5) and the deaerator (4), the water storage tank (5) is connected with a booster pump (8), 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 with a branch line comprising a fifth pipeline flow detection processing device (F5) and a fifth valve group (S5) in parallel, a heat release branch line (200-1) of the hot water pipeline is formed by the booster pump (8), the second pipeline flow detection processing device (F2) and a main line below the second valve group (S2), an upper bypass 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) form a branch line heat storage (200-2) of the hot water pipeline, the hot water pipeline is finally connected to the deaerator (4), and a fourth valve group (S4) and a fourth pipeline flow detection processing device (F4) are arranged on a main line (400) where the deaerator (4) is located;
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 release working condition is as follows: the condensed water in the condenser (6) is sent out by the condensed water pump (7), one path of the condensed water enters the deaerator (4) through the heater (3), the other path of the condensed water enters the water storage tank (5) through the cold water pipeline (300), and then the same amount of hot water is pumped to the deaerator (4) from the water storage tank (5) by the booster pump (8);
the condensate flow acquired by the first pipeline flow detection processing device (F1) is regulated, the opening of the first valve group (S1) is regulated, a unit power generation power command to be changed is converted into corresponding flow through a conversion function of power and heat storage and release flow, the corresponding flow is superposed with a condensate flow set value, and the superposed flow is subtracted by an actual condensate flow to be used as the input of a main regulator, so that the opening of the first valve group (S1) is regulated.
6. The method for controlling power under the heat release condition of the heat storage peak shaving system according to claim 5, wherein: acquiring a liquid level signal of the deaerator (4) as an adjusted quantity, and maintaining the liquid level of the water storage tank (5) at a set value by adjusting the opening of an adjusting valve in a second valve group (S2) as an adjusted quantity; acquiring a signal of the outlet pressure of the booster pump (8/81) as a regulated quantity, and the rotating speed of the booster pump (8/81) as a regulated quantity, and maintaining the outlet pressure of the booster pump (8/81) at a set value; acquiring a liquid level signal of the water storage tank (5) as an adjusted quantity, and adjusting the opening of an adjusting valve in a third valve group (S3) as an adjusted quantity to maintain 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 from the condensate pump (7) to the third valve group S3 are opened; both 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 to meet the requirement of the deaerator on liquid level change.
7. The method for controlling power under the heat release condition of the heat storage peak shaving system according to claim 6, wherein: according to the method, under the typical working conditions of the unit, calculated data or engineering measured data of the change of the generating power of the unit caused by different heat storage flows are used as the basis, and curve fitting is carried out on known data through analysis of the calculated data, so that the corresponding relation between the heat storage flows and the change of the generating power of the unit under the different working conditions is obtained.
8. The method for power control under the heat release condition of the thermal storage peak shaving system according to claim 7, 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) to be regulated.
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