CN110594722B - Drainage control system and method for low pressure drain cooler regenerator system - Google Patents
Drainage control system and method for low pressure drain cooler regenerator system Download PDFInfo
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- CN110594722B CN110594722B CN201810601963.5A CN201810601963A CN110594722B CN 110594722 B CN110594722 B CN 110594722B CN 201810601963 A CN201810601963 A CN 201810601963A CN 110594722 B CN110594722 B CN 110594722B
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- 238000000034 method Methods 0.000 title claims abstract description 34
- 239000012530 fluid Substances 0.000 claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 27
- 238000010438 heat treatment Methods 0.000 claims abstract description 10
- 238000004891 communication Methods 0.000 claims abstract description 8
- 238000000605 extraction Methods 0.000 claims abstract description 6
- 238000009833 condensation Methods 0.000 claims abstract description 4
- 230000005494 condensation Effects 0.000 claims abstract description 4
- 239000007788 liquid Substances 0.000 claims description 45
- 230000002209 hydrophobic effect Effects 0.000 claims description 31
- 230000008929 regeneration Effects 0.000 claims description 6
- 238000011069 regeneration method Methods 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 238000012546 transfer Methods 0.000 claims description 2
- 230000001172 regenerating effect Effects 0.000 abstract description 7
- 230000001105 regulatory effect Effects 0.000 description 17
- 230000008569 process Effects 0.000 description 7
- 230000001276 controlling effect Effects 0.000 description 5
- 239000002918 waste heat Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000010248 power generation Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003631 expected effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B35/00—Control systems for steam boilers
-
- 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
- F22D1/32—Feed-water heaters, i.e. economisers or like preheaters arranged to be heated by steam, e.g. bled from turbines
-
- 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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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
- Sorption Type Refrigeration Machines (AREA)
Abstract
The invention discloses a drainage control system and a drainage control method for a low-pressure drainage cooler regenerative system, wherein drainage of a low-pressure heater of a certain stage is in fluid communication with a high-temperature drainage inlet of a low-pressure drainage cooler through a first valve, and drainage of the low-pressure heater of the certain stage is discharged into a condenser after being cooled by the low-pressure drainage cooler; a part of drain water of a low-pressure heater of a next stage of low-pressure heater of a certain stage is in fluid communication with a low-temperature drain inlet of a low-pressure drain cooler through a second valve, enters the low-pressure heater of the next stage after being heated and vaporized by the low-pressure drain cooler, and is used for heating condensation water, and the other part of drain water of the low-pressure heater of the next stage of low-pressure heater of the certain stage automatically flows to a condenser or the next low-pressure heater through a third valve; the controller is respectively connected with the first valve, the second valve and the third valve in a signal way. The drainage control system realizes the purposes of indirectly heating the condensed water, reducing the steam extraction amount and improving the economy of the unit through the linkage control of the drainage valve.
Description
Technical Field
The invention relates to the field of power generation, in particular to a drainage control system and a drainage control method for a low-pressure drainage cooler regenerative system.
Background
In a regenerative system of the existing steam turbine power plant, a step-by-step self-flowing drainage mode is adopted between two adjacent low-pressure heaters, particularly between two last-stage low-pressure heaters, and drainage is utilized to heat main condensate in a drainage cooling section of the last-stage low-pressure heater, so that heat is recovered, and the aim of improving the heat economy of a unit is achieved.
However, in many subcritical and supercritical units currently operated in China, the problem of unsmooth drainage of the last two-stage low-pressure heater is mainly caused by the fact that the pressure difference between the two-stage low-pressure heaters is too small, so that the pressure difference is insufficient to overcome the resistance of a drainage pipeline and a corresponding valve, and in many units, critical drainage valves are required to be opened for a long time in the normal operation or low-load operation stage, so that heat loss is caused, and the economy of the units is reduced.
Therefore, the art is not provided with a drainage control system and a drainage control method of a low-pressure drainage cooler regenerative system so as to optimize the regulation and control of a drainage valve and improve the thermal economy of a unit.
Disclosure of Invention
The invention aims to provide a drainage control system and a drainage control method for a low-pressure drainage cooler regenerative system, wherein the drainage control system adopts an optimized control scheme, the efficient linkage control of the drain valve on the main pipeline effectively utilizes the waste heat of the drain working medium, indirectly heats the condensed water, reduces the extraction quantity and improves the economy of the unit.
In a first aspect of the invention, there is provided a charge control system for a low pressure charge trap regenerator system, in particular comprising a multi-stage low pressure heater, a condenser, a first valve, a second valve, a third valve, a low pressure charge trap and a controller, wherein the charge of a low pressure heater of a certain stage is in fluid communication with a high temperature charge inlet of the low pressure charge trap via the first valve, and the charge of the low pressure heater of the certain stage is discharged into the condenser after being cooled by the low pressure charge trap; a part of drain water of a low-pressure heater of a next stage of the low-pressure heater of a certain stage is in fluid communication with a low-temperature drain inlet of the low-pressure drain cooler through the second valve, enters the low-pressure heater of the next stage after being heated and gasified by the low-pressure drain cooler, and is used for heating condensed water, and the other part of drain water of the low-pressure heater of the next stage of the low-pressure heater of the certain stage automatically flows to the condenser or the next low-pressure heater through the third valve; the controller is respectively connected with the first valve, the second valve and the third valve in a signal way.
In another preferred embodiment, the low pressure hydrophobic cooler is a surface heat exchanger.
In another preferred embodiment, the regeneration system includes a deaerator.
In another preferred embodiment, the low-pressure heater of a certain stage is a penultimate low-pressure heater of the regenerator system, and the low-pressure heater of a next stage of the certain stage is a final low-pressure heater of the regenerator system.
In another preferred embodiment, a part of the drain of the final low pressure heater is communicated to the condenser via a pipe and the third valve, and another part of the drain of the final low pressure heater is communicated to the low temperature drain inlet of the low pressure drain cooler via another pipe and the second valve.
In another preferred embodiment, the drain cooler is disposed between two low pressure heaters where there is a drain obstruction.
In another preferred embodiment, the operating pressure of the low pressure heater is less than 0.2MPa (a).
In another preferred embodiment, the operating pressure of the low pressure hydrophobic cooler is less than 0.2MPa (a).
In another preferred embodiment, the low-pressure drain cooler is arranged at a position lower than the low-pressure heater.
In a second aspect of the invention there is provided a method of controlling the regeneration of a low pressure charge trap regenerator system, in particular comprising
A) Providing a hydrophobic control system as claimed in claim 1;
b) The controller determines the opening degree of the first valve according to the liquid level value of the low-pressure heater of a certain level and considering the liquid level set value and the condensation water flow value of the low-pressure heater of the certain level;
c) The controller determines the opening degree of the second valve according to the heat conversion relation in the low-pressure drain cooler;
d) The controller determines the opening degree of the third valve according to the opening degree of the second valve and the liquid level of the lower-pressure heater of the next stage.
In another preferred example, the heat transfer relationship in the low pressure hydrophobic cooler satisfies a function F * (x):
Q＝G1c1(t′1-t″1)＝G2c2(t″2-t′2)；
Wherein:
G 1,G2: mass flow of hot and cold fluid, kg/s;
c 1,c2: specific heat of hot and cold fluids, J/(kg. Deg.C);
t' 1,t′2: inlet temperature of hot and cold fluid, DEG C;
t "1,t″2: outlet temperature of hot and cold fluid, DEG C;
g 1c1,G2c2: the heat capacity of the hot and cold fluids, W/. Degree.C.
In another preferred embodiment, the controller calculates the opening parameter of the first valve in a delayed manner and then uses the calculated opening parameter as a basis for adjusting the opening of the third valve.
In a third aspect of the invention, a generator set is provided, in particular comprising a hydrophobic control system as described above.
In another preferred embodiment, the generator set is a subcritical generator set, a supercritical generator set, or an ultra supercritical generator set.
In another preferred embodiment, the low pressure heater of the certain stage and the low pressure heater of the next stage of the certain stage draw steam are both from a low pressure cylinder.
It is understood that within the scope of the present invention, the above-described technical features of the present invention and technical features specifically described below (e.g., in the examples) may be combined with each other to constitute new or preferred technical solutions. And are limited to a space, and are not described in detail herein.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a system diagram of a charge-back control system for a low pressure charge-back cooler regenerator system in one example of the present invention;
fig. 2 is a system control flow diagram of the hydrophobic control system of fig. 1.
In the drawings, each is indicated as follows:
101-a hydrophobic control system;
1-a condenser;
2-a condensate pump;
3-1,3-2,3-3: a low pressure heater;
4-deaerator;
5-a low pressure drain cooler;
61-high temperature hydrophobic inlet;
62-a low temperature hydrophobic inlet;
63-steam outlet;
7-a controller.
Detailed Description
The inventor has developed a kind of drainage control system and method used for low-pressure drain cooler backheating system for the first time through extensive and intensive research, compared with existing design, the drainage control system of the invention has realized utilizing the hydrophobic heat of the low-pressure heater through the coordinated control of the drain valve on the main pipeline, through the low-pressure drain cooler system, the drainage of the low-pressure heater with lower heating pressure, the steam produced is led back to the low-pressure heater with lower pressure after the drainage is heated and vaporized, and then realize the accurate regulation and control, in order to indirectly heat the condensed water, reduce the steam extraction amount, raise the economic purpose of the machine set, have completed the invention on this basis.
Terminology
As used herein, the term "hydrophobic cooler" refers to a surface heat exchanger, called a hydrophobic cooler, that is used to cool the hydrophobic water appropriately before it flows into the next stage low pressure heater or condenser. The operating pressure of the trap is herein between 0.02MPa (a) and 0.2MPa (a), so is also called low-pressure trap.
As used herein, the term "low pressure heater" refers to a surface heater rated for pressures between 0.015MPa (a) and 0.2MPa (a). Herein, the low-pressure heater may be single-row or double-row. In ultra supercritical units, it is generally referred to as surface heaters rated at pressures between 0.015MPa (a) and 0.2MPa (a). In supercritical units, it is generally referred to as surface heaters rated at pressures between 0.015MPa (a) and 0.15MPa (a). In other units, it is generally referred to as surface heaters rated at a pressure between 0.015MPa (a) and 0.1MPa (a).
The invention provides a drainage control system and a drainage control method for a low-pressure drainage cooler regenerative system. The hydrophobic control system of the present invention has a specific structure.
Typically, the hydrophobic control system of the present invention is shown in FIG. 1: the drain of the penultimate low-pressure heater 3-2 flows to the drain cooler 5 through the first valve (V1) and is discharged into the condenser 1. One drain of the final low-pressure heater 3-1 is discharged into the condenser 1 through a third valve (V3), and the other drain is discharged into the drain cooler 6 through a second valve (V2), and the drain is heated by high-temperature drain and then returns to the final low-pressure heater 3-1 for heating condensation water. The scheme can achieve the purposes of indirectly heating the condensed water, reducing the extraction quantity and improving the heat economy of the unit. The system effectively utilizes the waste heat of the hydrophobic working medium, and improves the economy of the unit to a greater extent. The expected effect of the process system is influenced by the corresponding control scheme, and the whole system is free to use and greatly increases the efficiency if the control scheme is implemented well; poor implementation of the control scheme can significantly detract from the desired effect of the process system. Therefore, the drainage control system of the invention further comprises a controller, and the controller adjusts the opening degrees of the first valve (V1), the second valve (V2) and the third valve (V3) according to the real-time condition so as to realize the optimal control of the whole water delivery control system and improve the heat economy of the system.
It should be noted that, in the automatic control process, the low-temperature drain inlet regulating valve (V2) of the drain cooler is always in a function of coordinating and controlling with the main control valve, namely the next-last-stage low-pressure heater 3-2 drain regulating valve (V1), so that the low-temperature drain inlet regulating valve is in a following valve state, and thus a role is divided into work, so that the main and the auxiliary of the system are engaged with each other to ensure the stability of the system.
In order to better realize the rhythm that the follow-up valve (V2) follows the main control valve (V1), the scheme adopts a control instruction of the main control valve (V1), and calculates the corresponding flow by applying a functional relation F * (x) after a delay according to the regulation characteristic of the regulating valve; the function F * (x) is determined according to the following thermal equilibrium equation.
Q＝G1c1(t′1-t″1)＝G2c2(t″2-t′2)；
Wherein:
G 1,G2: mass flow of hot and cold fluid, kg/s;
c 1,c2: specific heat of hot and cold fluids, J/(kg. Deg.C);
t' 1,t′2: inlet temperature of hot and cold fluid, DEG C;
t "1,t″2: outlet temperature of hot and cold fluid, DEG C;
g 1c1,G2c2: the heat capacity of the hot and cold fluids, W/. Degree.C.
The control of the distribution of the drain volume of the drain cooler is to accurately incorporate the branch flow elements in real time. The drain quantity value of the drain cooler is to represent the drain diversion quantity caused by the regulating characteristic of a low-temperature drain inlet regulating valve (V2) of the drain cooler, and a certain advance quantity is considered, so that the drain regulating valve (V3) of the final low-pressure heater 3-1 is regulated more accurately when the drain diversion is considered.
The main advantages of the invention include:
(a) The drainage control system is optimized through linkage control of the drainage valve on the main pipeline so as to reduce hydrodynamic resistance and keep the system running in an optimal state;
(b) The drain water of a low-pressure heater of a certain stage is used for heating a part of the drain water of a low-pressure heater of a next stage, and after the drain water of the low-pressure heater of the next stage is heated and vaporized, the condensed water can be heated, so that the efficiency of the regenerative system is improved;
(c) The working pressure of the drain cooler reduces the manufacturing cost of drain cooler equipment and piping (including pipelines, pipe fittings, valves and the like) and improves the investment yield;
(d) The low-pressure drain cooler system has no corresponding flow resistance, smooth flow and high efficiency, and the running power of the condensate pump is not increased;
(e) The drain cooler adopts low-flow drain as a cooling medium, has small equipment external dimension, small pipe system and small occupied area, and creates a powerful condition for a technical improvement project with limited field;
(f) The method has good applicability, is suitable for new thermal power generation engineering, and particularly has better applicability to energy-saving technical improvement of the put-into-operation unit, and is also particularly suitable for high-parameter thermal power generation engineering.
Therefore, the drainage control system solves the problem of integral coordination and stable control of the low-pressure drainage cooler heat regeneration system according to the principles of energy conservation and heat balance, so that the whole system can better utilize the waste heat of the recovered working medium, save energy sources and effectively improve the efficiency of the system.
The invention will be further illustrated with reference to specific examples. It is to be understood that these examples are illustrative of the present invention and are not intended to limit the scope of the present invention. Furthermore, the drawings are schematic representations, and thus the apparatus and device of the present invention are not limited by the dimensions or proportions of the schematic representations.
In this context, the term "upper low-pressure heater" and the term "lower low-pressure heater" refer to the term "lower low-pressure heater" in the regenerator system, and the term "upper low-pressure heater" in the lower stage than the term "lower low-pressure heater" in the condenser position in the flow direction of the condensate water is also referred to as "upper low-pressure heater" in the lower stage than the term "lower low-pressure heater in the condenser position.
Furthermore, in the claims and the description of this patent, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Example 1
In order to solve the problem of poor drainage between low-pressure heaters, the drainage control system of this embodiment is shown in fig. 1. The drain control system 101 includes a multi-stage low pressure heater (3-1, 3-2, 3-3), a condenser 1, a first valve (V1), a second valve (V2), a third valve (V3), a deaerator 4, a low pressure drain cooler 5, and a controller 7. Wherein the low-pressure drain cooler 5 is a surface heat exchanger.
The drain of the penultimate low pressure heater (3-2) is in fluid communication with the high temperature drain inlet 61 of the low pressure drain cooler 5 via a first valve (V1), wherein the first valve (V1) is in primary control with the liquid level L 3-2 of the penultimate low pressure heater (3-2), and the drain of the penultimate low pressure heater (3-2) is cooled by the low pressure drain cooler 5 and then discharged into the condenser. A part of the drain water of the final low-pressure heater (3-1) is in fluid communication with the low-temperature drain inlet 62 of the low-pressure drain cooler 5 through the second valve (V2), flows out of the steam outlet 63 and enters the final low-pressure heater (3-1) after being heated and vaporized by the low-pressure drain cooler 5, is used for heating condensate, and the other part of the drain water of the final low-pressure heater (3-1) automatically flows to the condenser 1 through the third valve (V3), wherein the third valve (V3) is used for controlling the liquid level L 3-1 corresponding to the final low-pressure heater (3-1). The controller 7 is electrically connected with the first valve (V1), the second valve (V2) and the third valve (V3) respectively and is used for controlling the opening degree of each valve according to the operation condition of the system, so that the system always keeps high-efficiency operation.
A system control flow chart of the hydrophobic control system of the present embodiment is shown in fig. 2. The controller 7 collects the liquid level L 3-2 of the penultimate low-pressure heater (3-2) through a liquid level detector and other sensors, the liquid level value is processed by an inertial link module (LEAD/LAG) to remove disturbance of the data, the liquid level L 3-2 after disturbance removal is processed by a superposition module (Sigma), the liquid level L 3-2 is compared with a set value of L 3-2 in the superposition module (Sigma), the difference value of the liquid level L 3-2 is amplified by a proportional integral derivative module (PID) module and introduced into a condensate flow parameter, the adder (+) substitutes the condensate flow into a flow influence function to calculate a required liquid level L 3-2 value, the required liquid level L 3-2 and the set value of L 3-2 together determine a final value of L 3-2, and the controller controls the opening of the first valve (V1) according to the final L 3-2.
The controller 7 delays the opening parameter of the first valve (V1) by the hysteresis module (LAG), and then substitutes the delay parameter into the heat balance relation function F * (x) to calculate:
Q＝G1c1(t′1-t″1)＝G2c2(t″2-t′2)；
Wherein:
G 1,G2: mass flow of hot and cold fluid, kg/s;
c 1,c2: specific heat of hot and cold fluids, J/(kg. Deg.C);
t' 1,t′2: inlet temperature of hot and cold fluid, DEG C;
t "1,t″2: outlet temperature of hot and cold fluid, DEG C;
g 1c1,G2c2: the heat capacity of the hot and cold fluids, W/. Degree.C.
In the above expression, the opening parameter of the first valve (V1), that is, the flow parameter at the first valve (V1) is G 1, and G 2, that is, the flow parameter at the second valve (V2), is calculated from F * (x), thereby controlling the opening of the second valve (V2).
The flow parameter at the second valve (V2), namely the opening of the second valve (V2), is processed by an inertial link module (LEAD/LAG) to remove disturbance of the data, and then is carried into a function F (x) for calculation, wherein the function F (x) is a functional relation between a regulating valve control command and corresponding flow determined according to specific regulating characteristics of the second valve (V2), and a dynamic influence factor of hydrophobic diversion of the final low-pressure heater (3-1) is introduced according to the functional relation.
The data processing process of the liquid level L 3-1 of the final-stage low-pressure heater is similar to that of the liquid level L 3-2 of the penultimate low-pressure heater (3-2), namely, the controller 7 collects the liquid level L 3-1 of the final-stage low-pressure heater (3-1) through a liquid level detector and other sensors, the liquid level value is processed by an inertia link module (LEAD/LAG), disturbance of the data is removed, the data is processed by a superposition module (sigma), the liquid level L 3-1 is compared with the set value of the L 3-1 in the superposition module (sigma), the difference value of the liquid level L 3-1 is amplified by a proportional integral derivative module (PID) and is introduced into a condensate flow parameter, the condensate flow is substituted into a flow influence function in the adder (+) to calculate the required liquid level L 3-1 value, the value of the L 3-2 determined by the required liquid level L 3-1 and the set value of the L 3-1 is input into the superposition module (sigma), the opening degree of the second valve (V2) calculated by a function F (x) is also input into the superposition module (sigma), and the difference value is the opening degree of the third valve (V3) in the superposition module (sigma). The controller 7 controls the opening of the third valve (V3) based on the opening value.
In summary, the hydrophobic regulating valve of the penultimate low pressure heater (3-2), i.e. the first valve (V1), acts as a main control valve, and plays a leading and pilot role, which is a heat source of the low pressure hydrophobic cooler 5, and when the liquid level L 3-2 of the corresponding low pressure heater is opportunistically regulated, the amount of hydrophobic of the final low pressure heater (3-1) under heating specific parameters is directly determined according to energy determined by parameters such as temperature difference, specific heat and flow, so as to determine a control command of the low temperature hydrophobic inlet regulating valve of the low pressure hydrophobic cooler 5, i.e. the second valve (V2). The drain regulator valve of the final low-pressure heater (3-1), i.e. the third valve (V3), focuses on the distribution of the drain while opportunistically regulating the corresponding low-pressure heater level L 3-1, thus introducing the drain quantity element distributed to the low-pressure drain cooler 5.
Finally, the hydrophobic regulating valve of the penultimate low-pressure heater (3-2), namely the first valve (V1), the low-temperature hydrophobic inlet regulating valve of the low-pressure hydrophobic cooler 5 and the hydrophobic regulating valve of the final low-pressure heater (3-1), namely the third valve (V3) are tightly matched with each other and run in a coordinated manner, and the rings are buckled with each other, so that the whole system runs orderly according to the principle of conservation of energy.
The embodiment is particularly beneficial to the unit transformation of the poor drainage between certain two-stage low-pressure heaters, and the drainage cooler can be additionally arranged behind the low-pressure heater with the poor drainage according to the steam extraction pressure, so that the problem of poor drainage is solved.
It is to be noted that only 3 low-pressure heaters and 1 deaerator are shown in the drawing for clarity, but those of ordinary skill in the art will understand that the number of low-pressure heaters is not limited to 3, and that a specific number of low-pressure heaters may be provided as needed. Furthermore, although only one low pressure drain cooler system is shown in the figures, a plurality of low pressure drain cooler systems may be provided as needed to solve the problem of drain obstruction between a plurality of low pressure heaters.
According to the embodiment, the whole coordination and stable control of the low-pressure drain cooler heat regeneration system is realized according to the principles of energy conservation, heat balance and the like, so that the whole system can better utilize and recycle the waste heat of working media, energy is saved, and the efficiency of the system is effectively improved.
Example 2
This example is a generator set comprising the hydrophobic control system as described in example 1. The generator set is a subcritical set.
All documents mentioned in this disclosure are incorporated by reference in this disclosure as if each were individually incorporated by reference. Further, it will be appreciated that various changes and modifications may be made by those skilled in the art after reading the above teachings, and such equivalents are intended to fall within the scope of the application as defined in the appended claims.
Claims (13)
1. A method for controlling the regeneration system of a low pressure charge trap, the method comprising
A) There is provided a charge-back control system for a low pressure charge-back cooler regenerator system, the charge-back control system comprising a multi-stage low pressure heater, a condenser, a first valve, a second valve, a third valve, a low pressure charge-back cooler, and a controller, wherein
The drain of the penultimate low pressure heater is in fluid communication with the high temperature drain inlet of the low pressure drain cooler via the first valve, and the drain of the penultimate low pressure heater is discharged into the condenser after being cooled by the low pressure drain cooler;
A part of drain water of a final low-pressure heater is in fluid communication with a low-temperature drain inlet of the low-pressure drain cooler through the second valve, enters the final low-pressure heater after being heated and vaporized by the low-pressure drain cooler and is used for heating condensation water, and the other part of drain water of the final low-pressure heater automatically flows to the condenser through the third valve;
The controller is respectively connected with the first valve, the second valve and the third valve in a signal manner;
b) The controller collects the liquid level value of the penultimate low-pressure heater through a liquid level detector, the liquid level value of the penultimate low-pressure heater is processed through an inertia link module to remove disturbance of the data, the liquid level value of the penultimate low-pressure heater after disturbance is removed is processed through a superposition module, in the superposition module, the liquid level value of the penultimate low-pressure heater is compared with a liquid level set value of the penultimate low-pressure heater, the difference value of the liquid level value of the penultimate low-pressure heater and the liquid level set value of the penultimate low-pressure heater is processed through a proportional integral derivative module, a condensate flow parameter is introduced, in an adder, the condensate flow is substituted into a flow influence function to calculate the required liquid level value of the penultimate low-pressure heater, the required liquid level value and the liquid level set value of the penultimate low-pressure heater together determine the final liquid level value of the penultimate low-pressure heater, and the controller determines the opening degree of the first valve according to the final liquid level value of the penultimate low-pressure heater;
c) The controller determines the opening degree of the second valve according to the heat conversion relation in the low-pressure drain cooler, wherein the opening degree of the second valve is processed by an inertia link module so as to remove disturbance of the data;
d) The controller collects the liquid level value of the final low-pressure heater through a liquid level detector, the liquid level value of the final low-pressure heater is processed through an inertia link module, disturbance of the data is removed, the liquid level value is processed through a superposition module, in the superposition module, the liquid level value of the final low-pressure heater is compared with a set value of the final low-pressure heater, a difference value of the liquid level value and the set value of the final low-pressure heater is processed through a proportional integral derivative module, the parameter of the condensate flow is introduced, in an adder, the condensate flow is substituted into a flow influence function to calculate the required liquid level value, the liquid level value of the final low-pressure heater determined by the required liquid level and the set value of the final low-pressure heater is input into the superposition module, the opening of the second valve is also input into the superposition module, and in the superposition module, the difference value is the opening of the third valve.
2. The method according to claim 1, wherein the heat transfer relationship in the low pressure drain cooler satisfies a function F * (x):
Q＝G1c1(t′1-t″1)＝G2c2(t″2-t′2)；
Wherein:
G 1,G2: mass flow of hot and cold fluid, kg/s;
c 1,c2: specific heat of hot and cold fluids, J/(kg. Deg.C);
t' 1,t′2: inlet temperature of hot and cold fluid, DEG C;
t "1,t″2: outlet temperature of hot and cold fluid, DEG C;
g 1c1,G2c2: the heat capacity of the hot and cold fluids, W/. Degree.C.
3. The method according to claim 1, wherein the controller calculates the opening parameter of the first valve with a delay and then uses the calculated opening parameter as a basis for adjusting the opening of the third valve.
4. The method of claim 1, wherein the low pressure hydrophobic cooler is a surface heat exchanger.
5. The method of claim 1, wherein the regeneration system comprises a deaerator.
6. The method of claim 1, wherein a portion of the drain of the final low pressure heater is communicated to the condenser via a conduit and the third valve, and another portion of the drain of the final low pressure heater is communicated to a low temperature drain inlet of the low pressure drain cooler via another conduit and the second valve.
7. The method of claim 1, wherein the drain cooler is disposed between two low pressure heaters where there is a drain fault.
8. The method of claim 1, wherein the operating pressure of the low pressure heater is less than 0.2MPa.
9. The method of claim 1, wherein the low pressure hydrophobic cooler operates at a pressure of less than 0.2MPa.
10. The water drain control method according to claim 1, wherein the low-pressure water drain cooler is disposed at a position lower than the low-pressure heater.
11. The method according to any one of claims 1 to 10, wherein the hydrophobic control system is comprised in a generator set.
12. The method of claim 11, wherein the generator set is a subcritical generator set, a supercritical generator set, or a ultra supercritical generator set.
13. The water repellency control method of claim 11, wherein the extraction of steam from both the penultimate low pressure heater and the final low pressure heater is from a low pressure cylinder.
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|---|---|---|---|---|
| CN103836608A (en) * | 2014-03-10 | 2014-06-04 | 中国电力工程顾问集团华东电力设计院 | Regenerative system of low-pressure drain water cooler |
| CN206419968U (en) * | 2017-01-22 | 2017-08-18 | 华能南京金陵发电有限公司 | A kind of station boiler low-temperature flue gas heat recovering device |
| CN208703903U (en) * | 2018-06-12 | 2019-04-05 | 中国电力工程顾问集团华东电力设计院有限公司 | Low pressure drainage control system and its generating set |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB854410A (en) * | 1956-06-11 | 1960-11-16 | Jaroslav Nekolny | A method for increasing the efficiency of multistage feed-water heating by extractedsteam |
| CN101886804B (en) * | 2010-05-26 | 2011-07-20 | 中国电力工程顾问集团华北电力设计院工程有限公司 | All-backheating drainage system of heat supply network heater for supercritical concurrent boiler thermal power plant |
| CN102519033B (en) * | 2011-12-19 | 2014-01-15 | 中国电力工程顾问集团西北电力设计院 | Supercritical/super-supercritical unit heating drain recovery method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103836608A (en) * | 2014-03-10 | 2014-06-04 | 中国电力工程顾问集团华东电力设计院 | Regenerative system of low-pressure drain water cooler |
| CN206419968U (en) * | 2017-01-22 | 2017-08-18 | 华能南京金陵发电有限公司 | A kind of station boiler low-temperature flue gas heat recovering device |
| CN208703903U (en) * | 2018-06-12 | 2019-04-05 | 中国电力工程顾问集团华东电力设计院有限公司 | Low pressure drainage control system and its generating set |
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