CN112947609A - Main steam pressure setting control strategy and system for sliding pressure operation unit - Google Patents
Main steam pressure setting control strategy and system for sliding pressure operation unit Download PDFInfo
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Abstract
The invention relates to a main steam pressure setting control system and a main steam pressure setting control method for a sliding pressure operation unit, wherein the unit is judged to be in a load-increasing stage through the change of a unit load instruction, and when the reduction rate of the main steam pressure exceeds a first set value, the change rate of the set value of the main steam pressure is zero; and judging that the unit is in a load reduction stage through the change of the unit load instruction, and when the rising rate of the main steam pressure exceeds a second set value, the change rate of the set value of the main steam pressure is zero. The change rate of the pressure set value is adjusted according to the load change condition, so that the difference between the main steam pressure set value and the actual pressure in the pressure control process is reduced, the pressure great fluctuation caused by the boiler combustion response delay is reduced, and the stability of the unit sliding pressure operation is realized.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to a main steam pressure setting control strategy and a main steam pressure setting control system for a sliding pressure operation unit.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
When the sliding pressure runs, the regulating valve is in full opening or unchanged in opening, and the fuel quantity, the water supply quantity and the air quantity entering the boiler are regulated according to the fluctuation of the load, so that the steam pressure and the flow quantity at the outlet of the boiler are changed along with the change of the load, the steam temperature is unchanged in the process, and the regulation of the power generation power is realized. When the turbine operates under the sliding pressure, the change of the power of the unit is realized by adjusting the size of the main steam pressure, so the main steam pressure and the change of the power of the unit are synchronous. The turbine sliding pressure operation mode comprises three modes of pure sliding pressure operation, throttling sliding pressure and composite sliding pressure. The pure sliding pressure operation and the throttling sliding pressure operation can adopt throttling steam distribution or nozzle steam distribution, and the composite sliding pressure operation mode generally adopts nozzle steam distribution.
The unit adopts a composite sliding pressure operation mode in variable load, so that better thermal economy can be kept, and better load response capability can be ensured, so that the unit is more applied in practical application.
In the existing large-capacity unit, especially an ultra-supercritical million units, the whole-process sliding-pressure operation is realized, and the requirements of power grid dispatching are met while the unit efficiency and the economy are met. For a steam turbine, the change of the power grid dispatching requirement means the change of the unit load, the sliding pressure operation controls the output power of the steam turbine by means of the steam pressure and the temperature output by a boiler, and the steam pressure set value of the steam turbine changes along with a load instruction, so that the control deviation between the steam pressure set value and an actual value is overlarge in the process of changing the load, and the relevant control parameters (water supply flow, fuel quantity and air quantity) of a main control system of the boiler are overregulated to influence the stability of the subsequent parameters of the unit.
Disclosure of Invention
In order to solve the technical problems in the background art, the invention provides a main steam pressure setting control strategy and a main steam pressure setting control system for a sliding pressure operation unit, which can adjust the change rate of the boiler pressure setting value according to the load change condition of the unit, thereby reducing the pressure great fluctuation caused by the boiler combustion response delay and realizing the stability of the sliding pressure operation of the unit.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a main steam pressure setting control strategy of a slip pressure operation unit, which comprises the following steps:
judging the variable load stage of the unit according to the change of the load instruction of the unit;
when the unit is in a load-up stage and the descending rate of the main steam pressure exceeds a first set value, the change rate of the set value of the main steam pressure is cut to be zero;
when the unit is in the load reduction stage and the rising rate of the main steam pressure exceeds a second set value, the change rate of the set value of the main steam pressure is cut to be zero.
The unit load instruction is an instruction for controlling the output power of the unit formed according to the power grid dispatching.
The main steam pressure set value is a steam pressure set value which is set according to the unit output power target value and meets the unit load change requirement.
And when the change rate of the main steam pressure set value is in a load increasing stage or a load reducing stage, the change amount of the main steam pressure set value in unit time meeting the load change requirement is met.
In the load increasing stage, the actual main steam pressure of the boiler is firstly reduced, and then the actual main steam pressure is increased back to the pressure set value after the combustion response of the boiler is carried out for a period of time.
The main steam pressure is decreased at the rate of the first decreasing part of the actual main steam pressure in the boiler during the load-up stage.
In the load reduction stage, the actual main steam pressure of the boiler is firstly increased, and then falls back to the pressure set value after the combustion response of the boiler is carried out for a period of time.
The rising rate of the main steam pressure is the rate of the first rising part of the actual main steam pressure of the boiler in the load reduction stage.
During the unit slip pressure operation load-lifting process, the rate of the boiler responding to the load change lags behind the rate of the steam turbine load-lifting change.
During the unit slip pressure operation load reduction process, the boiler response load change rate lags behind the steam turbine load reduction change rate.
A second aspect of the present invention provides a main steam pressure setting control system for a slip pressure operation unit, including:
the load judging module is used for judging the load stage of the unit according to the change of the load instruction of the unit;
the main steam pressure setting module adjusts the change rate of the main steam pressure setting value according to the unit load stage given by the load judging module, and specifically comprises the following steps:
when the unit is in a load-up stage and the descending rate of the main steam pressure exceeds a first set value, the change rate of the set value of the main steam pressure is cut to be zero;
when the unit is in the load reduction stage and the rising rate of the main steam pressure exceeds a second set value, the change rate of the set value of the main steam pressure is cut to be zero.
Compared with the prior art, the above one or more technical schemes have the following beneficial effects:
1. the change rate of the pressure set value is adjusted according to the load change condition, so that the difference between the main steam pressure set value and the actual pressure in the pressure control process is reduced, the pressure great fluctuation caused by the boiler combustion response delay is reduced, and the stability of the unit sliding pressure operation is realized.
2. The main steam pressure set value is prevented from rising along with a load instruction in the load rising process, and steam provided by the boiler cannot rise to the set value immediately, so that the deviation between the main steam pressure set value and an actual value is overlarge, and the influence on the subsequent parameter stability of a unit caused by the overshoot of related control parameters (water supply flow, fuel quantity and air quantity) of the main control of the boiler is avoided.
3. In the load reduction process, the main steam pressure set value is reduced along with the load instruction, and the steam provided by the boiler cannot be immediately reduced to the set value, so that the deviation of the main steam pressure set value and an actual value is overlarge, and the influence on the subsequent parameter stability of the unit caused by the overshoot of related control parameters (water supply flow, fuel quantity and air quantity) of the main control of the boiler is avoided.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
Fig. 1 is a schematic diagram of a control process provided by one or more embodiments of the invention.
Detailed Description
The invention is further described with reference to the following figures and examples.
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As described in the background, the operation of a steam turbine is closely related to the scheduling of the power grid, a change in the scheduling requirement of the power grid means a change in the load of the unit, and the slip pressure operation is to control the output power of the steam turbine depending on the steam pressure and temperature output from the boiler.
Under the general condition, a turbine has sliding pressure operation and constant pressure operation, the constant pressure operation has better economy and faster load reflecting speed when a unit is in high load, and the throttling loss is large when the unit is in low load, so that the power consumption of a pump is high. When the unit operates under the condition of sliding pressure, the speed of reflecting the load is low, the loss is less when the load is low, and the efficiency is low when the load is high, so that the conventional unit generally operates under the condition of sliding pressure when the load is low, and the unit operates under the condition of constant pressure when the load is high.
In a large-capacity unit which realizes whole-course sliding pressure operation, particularly an ultra-supercritical million unit, a required steam pressure set value is set for a steam turbine according to a load instruction, a boiler provides more or less steam for the steam turbine according to the steam pressure set value, combustion response delay exists in the boiler, the rate of responding to load of the boiler is not matched with the rate of changing load of the steam turbine in unit time, so that the deviation of the steam pressure set value and an actual value is overlarge, and related control parameters (water supply flow, fuel quantity and air quantity) of a main control system of the boiler are overregulated to influence the subsequent parameter stability of the unit.
For example: when the load of the steam turbine is increased, the unit needs the boiler to provide more steam to support the gradually increased load, a steam pressure set value meeting the load increasing requirement is set, the set value is continuously increased, a parameter of pressure set value change rate exists between the set value and the actual steam pressure value output by the boiler, the parameter is used for monitoring the change rate between the actual steam pressure output by the boiler and the required set steam pressure, and therefore accidents caused by too fast steam pressure increase are prevented, the boiler needs to provide more steam for the steam turbine according to the continuously increased steam pressure set value, the boiler needs a series of actions of increasing air quantity, consuming more fuel, supplementing water and the like to meet the 'more steam quantity' required by the load increase of the steam turbine, the process is not immediate response, combustion response delay exists, and the load increase of the unit can cause, the rate of the boiler response load lags behind the load-increasing rate of the steam turbine, if the rate is reflected on a steam curve output by the boiler, the actual main steam pressure is firstly reduced and then is increased back to a pressure set value, and under the condition, the deviation between the main steam pressure set value and the actual value is overlarge, the related control parameters (water supply flow, fuel quantity and air quantity) of the main control of the boiler can be excessively adjusted, or certain interlocking protection mechanisms are triggered. After the pressure is increased back to the pressure set value, the actual steam pressure exceeds the steam pressure set value required by the steam turbine due to the influence of the combustion response delay of the boiler, so that the boiler cannot provide stable and balanced steam pressure, a subsequent unit cannot complete load-increasing operation, and the subsequent parameter stability of the unit is influenced.
When the load of the steam turbine is reduced, the influence that the speed of the response load of the boiler lags behind the load increasing speed of the steam turbine similarly exists in the process, and the related parameters of the main control of the boiler are adjusted excessively to cause the unbalance of a unit.
The first embodiment is as follows:
as shown in fig. 1, a main steam pressure setting control strategy for a slip pressure operation unit includes the following steps:
judging the load stage of the unit according to the change of the load instruction of the unit;
when the unit is in a load-up stage and the descending rate of the main steam pressure exceeds a first set value, the change rate of the set value of the main steam pressure is cut to be zero;
when the unit is in the load reduction stage and the rising rate of the main steam pressure exceeds a second set value, the change rate of the set value of the main steam pressure is cut to be zero.
During the unit sliding pressure operation process, the unit is judged to be in a load-increasing stage through load instruction change, according to the normal operation condition, the rate of the boiler responding to load change is behind the rate of the steam turbine load-increasing change, and the actual main steam pressure is firstly reduced, then the boiler is raised again after the boiler combustion responds for a period of time and is followed to a pressure set value.
Therefore, when the falling rate of the main steam pressure exceeds a first set value, the set change rate of the main steam pressure is cut to zero, and the purpose is to avoid that the main steam pressure set value rises along with a load instruction in the load increasing process, and the steam provided by the boiler cannot rise to the set value immediately, so that the deviation of the main steam pressure set value and an actual value is overlarge, and the main control related control parameters (water supply flow, fuel quantity and air quantity) of the boiler are overregulated to influence the subsequent parameter stability of the unit.
During the unit sliding pressure operation process, the load instruction change is used for judging that the unit is in a load reduction stage, according to the normal operation condition, the rate of the boiler responding to the load change is behind the rate of the steam turbine load reduction change, and the actual main steam pressure is firstly increased, then falls back after the boiler responds for a period of time and follows the pressure set value.
Therefore, when the rising rate of the main steam pressure exceeds a second set value, the set change rate of the main steam pressure is cut to zero, and the purpose is to avoid that the main steam pressure set value is reduced along with a load instruction in the load reduction process, and the steam provided by the boiler cannot be immediately reduced to the set value, so that the deviation of the main steam pressure set value and an actual value is overlarge, and the main steam pressure set value and the actual value are over-adjusted, so that the subsequent parameter stability of the unit is influenced.
Regarding the 'first set point' and the 'second set point', the two values are determined according to different types of boilers, turbines and different types of fuels, and by combining actual operation experience of the boilers and the turbines, in the actual load change process, the main steam pressure passively changes along with the pressure set point, and the response rate of boiler combustion is slower relative to the unit load change rate.
Under the load-lifting condition, the boiler cannot immediately generate enough steam to support the unit requirement of the load-lifting condition, a steam requirement notch can be formed in a short time, the steam requirement notch can be supplemented after a period of time, and the condition that the main steam pressure is firstly reduced and then is lifted is visually shown in the load-lifting process.
Under the load reduction, the boiler can not immediately reduce the generated steam quantity, redundant steam surplus can be generated in a short time, redundant steam is consumed or is shunted to other equipment after a period of time, and therefore the main steam pressure is intuitively reflected to rise and then fall in the load reduction process.
In addition, at some load change stages, because the heat storage capacity of the boiler can not meet the load change demand, the main steam pressure can be caused to drop rapidly, the pressure change rate at the moment can be faster than the variation of the boiler combustion response delay, the deviation of a pressure set value and an actual pressure value is overlarge at a certain time point in the load change process, and related parameters of the main control of the boiler are also caused to be unbalanced in a short time, so that the main parameters of the boiler are overshot after the follow-up load change stage is finished, and the stable control of a unit is not facilitated.
And by judging the change rate of the actual pressure of the boiler, when the pressure set value is about to trigger the overshoot of the main control parameter of the boiler, the change rate of the pressure is artificially cut to zero, the change of the pressure is stopped, so that the overshoot of the boiler is avoided, and after the response delay of the boiler is finished and the actual pressure rises stably, the change rate monitoring in the load rising process is carried out.
Accordingly, the mechanism of the load shedding phase is similar to the load shedding phase.
The change rate of the pressure set value is adjusted according to the load change condition, so that the difference between the main steam pressure set value and the actual pressure in the pressure control process is reduced, the pressure great fluctuation caused by the boiler combustion response delay is reduced, and the stability of the unit sliding pressure operation is realized.
Example two
The embodiment provides a main steam pressure setting control system of a sliding pressure operation unit, which comprises:
the load judging module judges the load stage of the unit according to the change of the load instruction of the unit;
the main steam pressure setting module adjusts the change rate of the main steam pressure setting value according to the unit load stage given by the load judging module, and specifically comprises the following steps:
when the unit is in a load-up stage and the descending rate of the main steam pressure exceeds a first set value, the change rate of the set value of the main steam pressure is cut to be zero;
when the unit is in the load reduction stage and the rising rate of the main steam pressure exceeds a second set value, the change rate of the set value of the main steam pressure is cut to be zero.
The change rate of the pressure set value is adjusted according to the load change condition, so that the difference between the main steam pressure set value and the actual pressure in the pressure control process is reduced, the pressure great fluctuation caused by the boiler combustion response delay is reduced, and the stability of the unit sliding pressure operation is realized.
EXAMPLE III
The present embodiment provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps in a main steam pressure setting control strategy for a skid-run power unit as described above.
The change rate of the pressure set value is adjusted according to the load change condition, so that the difference between the main steam pressure set value and the actual pressure in the pressure control process is reduced, the pressure great fluctuation caused by the boiler combustion response delay is reduced, and the stability of the unit sliding pressure operation is realized.
Example four
The embodiment provides a computer device, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor executes the program to realize the steps in the main steam pressure setting control strategy of the sliding pressure running unit.
The change rate of the pressure set value is adjusted according to the load change condition, so that the difference between the main steam pressure set value and the actual pressure in the pressure control process is reduced, the pressure great fluctuation caused by the boiler combustion response delay is reduced, and the stability of the unit sliding pressure operation is realized.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of a hardware embodiment, a software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A main steam pressure setting control strategy of a sliding pressure operation unit is characterized in that: the method comprises the following steps:
judging the variable load stage of the unit according to the change of the load instruction of the unit;
when the unit is in a load-up stage and the descending rate of the main steam pressure exceeds a first set value, the change rate of the set value of the main steam pressure is cut to be zero;
when the unit is in the load reduction stage and the rising rate of the main steam pressure exceeds a second set value, the change rate of the set value of the main steam pressure is cut to be zero.
2. The main steam pressure setting control strategy of the slip pressure operation unit as claimed in claim 1, wherein: the unit load instruction is an instruction for controlling the output power of the unit formed according to the power grid dispatching.
3. The main steam pressure setting control strategy of the slip pressure operation unit as claimed in claim 1, wherein: the main steam pressure set value is a steam pressure set value which is set according to the set output power target value and meets the set requirement.
4. The main steam pressure setting control strategy of the slip pressure operation unit as claimed in claim 1, wherein: the change rate of the main steam pressure set value is the change amount of the main steam pressure set value required in the load increasing stage or the load reducing stage in unit time.
5. The main steam pressure setting control strategy of the slip pressure operation unit as claimed in claim 1, wherein: in the load increasing stage, when the boiler normally operates, the actual main steam pressure firstly drops, and then the boiler is raised again after a period of combustion response to the set pressure value.
6. The main steam pressure setting control strategy of the slip pressure operation unit as claimed in claim 5, wherein: the rate of decrease of the main steam pressure is: the rate at which the actual main steam pressure of the boiler first drops during the load-up phase.
7. The main steam pressure setting control strategy of the slip pressure operation unit as claimed in claim 1, wherein: and in the load reduction stage, when the boiler normally operates, the actual main steam pressure is firstly increased, and then the main steam pressure falls back and follows the set pressure value after the boiler is subjected to combustion response for a period of time.
8. The main steam pressure setting control strategy of the slip pressure operation unit as claimed in claim 7, wherein: the rising rate of the main steam pressure is the rate of the first rising part of the actual main steam pressure of the boiler in the load reduction stage.
9. The main steam pressure setting control strategy of the slip pressure operation unit as claimed in claim 1, wherein: in the process of increasing the load during the unit sliding pressure operation, the rate of the boiler responding to the load change lags behind the rate of the load change of the steam turbine; during the unit slip pressure operation load reduction process, the boiler response load change rate lags behind the steam turbine load reduction change rate.
10. The utility model provides a slip pressure operation unit owner steam pressure's settlement control system which characterized in that: the method comprises the following steps:
the load judging module is used for judging the load stage of the unit according to the change of the load instruction of the unit;
the main steam pressure setting module adjusts the change rate of the main steam pressure setting value according to the unit load stage given by the load judging module, and specifically comprises the following steps:
when the unit is in a load-up stage and the descending rate of the main steam pressure exceeds a first set value, the change rate of the set value of the main steam pressure is cut to be zero;
when the unit is in the load reduction stage and the rising rate of the main steam pressure exceeds a second set value, the change rate of the set value of the main steam pressure is cut to be zero.
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| CN114153239A (en) * | 2021-11-15 | 2022-03-08 | 国网山东省电力公司电力科学研究院 | RB sliding pressure instruction adjusting method and device based on unit load and computer equipment |
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