CN113359886B - Low-load time interval heating steam pressure adjusting method, equipment, controller and medium - Google Patents
Low-load time interval heating steam pressure adjusting method, equipment, controller and medium Download PDFInfo
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- CN113359886B CN113359886B CN202110576297.6A CN202110576297A CN113359886B CN 113359886 B CN113359886 B CN 113359886B CN 202110576297 A CN202110576297 A CN 202110576297A CN 113359886 B CN113359886 B CN 113359886B
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- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D16/00—Control of fluid pressure
- G05D16/20—Control of fluid pressure characterised by the use of electric means
- G05D16/2006—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means
- G05D16/2013—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means
- G05D16/2026—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means with a plurality of throttling means
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Abstract
The invention relates to a method, equipment, a controller and a medium for regulating the pressure of heat supply steam in a low-load period, which comprise the following steps: s1: obtaining heat supply unit data, judging whether a control loop input condition is met, if so, entering a step S2, otherwise, returning to the step S1 until the loop input condition is met; s2: acquiring the load of the unit in real time, and when the load is greater than or equal to a set peak load, adjusting the opening of the medium-pressure regulating valve to 100%, otherwise, adjusting the opening of the medium-pressure regulating valve to a medium-pressure regulating valve opening value corresponding to the load of the unit; and S2, acquiring heat supply unit data in real time, judging whether a loop exit condition is met, and stopping adjusting the opening value of the middle door adjusting door when the loop exit condition is met. Compared with the prior art, the invention realizes stable and reliable external steam supply in a wide load interval and improves the flexibility of unit operation.
Description
Technical Field
The invention relates to the field of thermal power generation, in particular to a method, equipment, a controller and a medium for adjusting heat supply steam pressure in a low-load time period.
Background
In recent years, with the gradual release of the tension condition of the electricity load of the whole society and the increase of the pressure of energy conservation and emission reduction, a heat supply pipe network is paved on a plurality of large-scale power plants to extract steam and supply heat to adjacent industrial parks. The heat supply is to extract the steam with certain temperature and pressure after expansion work from the steam turbine for use by external heat users, and is one of the important ways of energy saving and consumption reduction of the unit. With the increasing of the power generation proportion of renewable energy sources, the operation mode of the thermal generator set is gradually changed from basic load bearing to operation at middle and peak loads, and the load changes frequently. The pressure and temperature parameters of the steam required by industrial heat users are relatively stable due to the special requirements of the production process, and the steam supply parameters of the power plant have the requirements that the industrial steam parameters are stable due to load fluctuation, and especially when a unit is in a low-load period, the steam extraction parameters of the unit are difficult to ensure the heat supply requirements of the users.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a method, equipment, a controller and a medium for regulating the pressure of heating steam in a low-load period.
The purpose of the invention can be realized by the following technical scheme:
a method for adjusting the pressure of heating steam in a low-load period comprises the following steps:
s1: obtaining heat supply unit data, judging whether a control loop input condition is met, if so, entering a step S2, otherwise, returning to the step S1 until the loop input condition is met;
s2: acquiring the load of the unit in real time, adjusting the opening of the medium-pressure regulating valve to 100% when the load is greater than or equal to a set peak load, or adjusting the opening of the medium-pressure regulating valve to a medium-pressure regulating valve opening value corresponding to the load of the unit;
and S2, acquiring heat supply unit data in real time, judging whether a loop exit condition is met, and stopping adjusting the opening value of the middle door adjusting door when the loop exit condition is met.
Preferably, the heat supply unit data comprises a high-pressure cylinder exhaust pressure signal, an actual load signal, a load size and a related control signal.
Preferably, the step S1 specifically includes:
s11: acquiring heat supply unit data in real time;
s12: judging whether the high-pressure cylinder exhaust pressure signal is normal, if so, entering a step S13, otherwise, returning to the step S11;
s13: judging whether the actual load signal is normal, if so, entering a step S14, otherwise, returning to the step S11;
s14: judging whether the load is larger than the input load, if so, entering a step S15, otherwise, returning to the step S11;
s15: and judging whether the relevant control signals are received or not, if so, entering the step S2, and otherwise, returning to the step S11.
Preferably, the loop exit conditions are:
and if the heat supply unit data meet one or more of the abnormal high-pressure cylinder exhaust pressure signal, the abnormal actual load signal, the load smaller than the withdrawal load and the received related control signals, the heat supply unit meets the loop withdrawal condition.
Preferably, the medium-voltage governing valve opening value corresponding to the unit load is obtained through a medium-voltage governing valve adjustment test in a low-load section.
Preferably, the step of the door pressure regulation adjustment test in the low load section comprises: setting a test load area, stabilizing the high discharge pressure at a preset test pressure value, adjusting the unit load in the test load area, and obtaining the opening degree of the medium-pressure regulating valve corresponding to different unit loads.
Preferably, the test load region is 130 MW-170 MW.
A low-load time interval heating steam pressure regulating device comprises an input module, a regulating module and an exit module,
the input module acquires heat supply unit data and judges whether the input condition of the control loop is met or not, if so, the input adjusting module adjusts the input condition, otherwise, the heat supply unit data are continuously acquired until the input condition of the loop is met;
the adjusting module acquires the unit load in real time, when the load is greater than or equal to a set peak load, the opening degree of the medium-pressure regulating valve is adjusted to 100%, otherwise, the opening degree of the medium-pressure regulating valve is adjusted to a medium-pressure regulating valve opening degree value corresponding to the unit load;
the exit module acquires heat supply unit data in real time, judges whether a loop exit condition is met or not, and stops adjusting the opening value of the middle door when the loop exit condition is met.
A controller, comprising: the system 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 computer program to realize the low-load period heating steam pressure adjusting method.
A computer readable storage medium having stored thereon computer executable instructions for performing the above-described low load period heating steam pressure adjustment method.
Compared with the prior art, the invention has the following advantages:
(1) According to the invention, the load interval of the heat supply unit is effectively expanded by utilizing the data of the low-load section obtained by the door pressure regulating and adjusting test in the load section and matching with the input and exit logics of the middle-pressure regulating door regulation, so that stable and reliable external steam supply in a wide load interval is realized, and the flexibility of unit operation is improved.
(2) The medium-pressure regulating valve participates in the regulation of steam pressure, and the high exhaust pressure is increased in a medium-pressure regulating valve throttling control mode, so that the heat supply requirement is ensured, the condition that the steam extraction parameter of the unit cannot ensure the heat supply requirement when the unit is in a low-load section can be effectively improved, the economy of the unit can be improved, and the stable and reliable external heat supply of the coal-fired generator set in a wide-load area can be realized.
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FIG. 1 is a flow chart of the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. Note that the following description of the embodiment is merely a substantial example, and the present invention is not intended to be limited to the application or the use thereof, and is not limited to the following embodiment.
Examples
A method for regulating the pressure of heat supply steam in a low-load period takes an N325-16.18/535/535 subcritical parameter, a single intermediate reheating, a four-cylinder four-steam-discharge, single-shaft and condensing steam turbine as an example, and the steam turbine is provided with 2 high-pressure main steam valves, 8 high-pressure regulating valves and 4 medium-pressure regulating valves.
When the method is implemented, firstly, the medium-pressure governor opening value corresponding to the unit load is obtained through a medium-pressure governor adjustment test in a low-load section. The step of the door pressure regulating adjustment test in the low-load section comprises the following steps: setting a test load area, stabilizing the high discharge pressure at a preset test pressure value, adjusting the unit load in the test load area, and obtaining the opening degree of the medium-pressure regulating valve corresponding to different unit loads. In this embodiment, the test load region is a 130 MW-170 MW section, and the preset test pressure value is 1.8MPa, so that the high discharge pressure is controlled to be stable at 1.8MPa, and the relevant test data is observed and recorded, that is, the corresponding relationship between the unit load and the opening of the medium pressure regulating valve is obtained on the premise that the high discharge pressure is constant at 1.8 MPa.
The steps of the invention are shown in fig. 1, and specifically, the step S1 includes:
s11: and acquiring heat supply unit data in real time, wherein the heat supply unit data comprises a high-pressure cylinder exhaust pressure signal, an actual load signal, a load size and a related control signal.
S12: judging whether the high-pressure cylinder exhaust pressure signal is normal, if so, entering a step S13, otherwise, returning to the step S11;
s13: judging whether the actual load signal is normal, if so, entering a step S14, otherwise, returning to the step S11;
s14: and judging whether the load size is larger than the input load, if so, entering the step S15, otherwise, returning to the step S11, wherein in the embodiment, the input load is 130MW.
S15: and judging whether the relevant control signal is received or not, if so, entering the step S2, and otherwise, returning to the step S11.
In this embodiment, the related control signals include a manual mode, a medium-pressure governor full-stroke test, a loosening test, OPC, and a trip signal.
S2: and acquiring the load of the unit in real time, and when the load is greater than or equal to the set peak load, adjusting the opening of the medium-pressure regulating valve to 100%, otherwise, adjusting the opening of the medium-pressure regulating valve to the opening value of the medium-pressure regulating valve corresponding to the load of the unit. In this example, the peak load is 180MW.
S2, specifically, setting a medium-pressure regulating valve control and regulation logic based on test data of a medium-pressure regulating valve regulation test in a low-load section: the high exhaust pressure of the medium pressure regulating valve consists of a high exhaust pressure control loop and a load feedforward loop. The load feedforward loop forms a medium-pressure governor opening instruction feedforward value according to the current load, the high-exhaust pressure control loop adjusts the pressure through a PID (proportion integration differentiation) loop, a high-exhaust pressure fixed value is set to be 1.8MPa, deviation correction setting of +/-0.1 MPa can be carried out on the fixed value during operation, the output range of the high-exhaust pressure control loop is +/-10%, a medium-pressure governor instruction is formed by the sum of the output value of the high-exhaust pressure control loop and the medium-pressure governor opening instruction feedforward value of the load feedforward loop, and cannot be smaller than 30%, when the load is larger than 180MW, the medium-pressure governor opening is cut to be 100%, and when the load is smaller than 175MW, the medium-pressure governor opening is adjusted to be a medium-pressure governor opening value corresponding to the unit load.
In step S2, heat supply unit data is obtained in real time, whether a loop exit condition is met or not is judged, adjustment of the opening degree value of the middle door is stopped when the loop exit condition is met, and the loop exit condition is as follows: and if the heat supply unit data meet one or more of the abnormal high-pressure cylinder exhaust pressure signal, the abnormal actual load signal, the load smaller than the withdrawal load and the received related control signals, the heat supply unit meets the loop withdrawal condition. In this embodiment, the exit load is 120MW.
A low-load time interval heating steam pressure regulating device comprises an input module, a regulating module and an exit module,
the input module acquires heat supply unit data, judges whether the input condition of the control loop is met or not, if so, the input adjusting module adjusts, otherwise, the heat supply unit data are continuously acquired until the input condition of the loop is met;
the adjusting module acquires the unit load in real time, when the load is greater than or equal to a set peak load, the opening degree of the medium-pressure regulating valve is adjusted to 100%, otherwise, the opening degree of the medium-pressure regulating valve is adjusted to a medium-pressure regulating valve opening degree value corresponding to the unit load;
the exit module acquires heat supply unit data in real time, judges whether a loop exit condition is met or not, and stops adjusting the opening value of the middle door adjusting door when the loop exit condition is met.
A controller, comprising: the system 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 computer program to realize the low-load period heating steam pressure adjusting method.
A computer readable storage medium having stored thereon computer executable instructions for performing the above-described low load period heating steam pressure adjustment method.
The above embodiments are merely examples and do not limit the scope of the present invention. These embodiments may be implemented in other various manners, and various omissions, substitutions, and changes may be made without departing from the technical spirit of the present invention.
Claims (8)
1. A method for adjusting the pressure of heating steam in a low-load period is characterized by comprising the following steps:
s1: obtaining heat supply unit data, judging whether a control loop input condition is met, if so, entering a step S2, otherwise, returning to the step S1 until the loop input condition is met;
s2: acquiring the load of the unit in real time, and when the load is greater than or equal to a set peak load, adjusting the opening of the medium-pressure regulating valve to 100%, otherwise, adjusting the opening of the medium-pressure regulating valve to a medium-pressure regulating valve opening value corresponding to the load of the unit;
step S2, obtaining heat supply unit data in real time, judging whether a loop exit condition is met, and stopping adjusting the opening value of the middle door adjusting door when the loop exit condition is met;
the medium-voltage governing valve opening value corresponding to the unit load is obtained through a medium-voltage governing valve adjusting test in a low-load section;
the step of the door pressure regulating adjustment test in the low-load section comprises the following steps: setting a test load area, stabilizing the high discharge pressure at a preset test pressure value, adjusting the unit load in the test load area, and acquiring the opening degree of the medium-pressure control valve corresponding to different unit loads.
2. The method as claimed in claim 1, wherein the heating unit group data includes high pressure cylinder exhaust pressure signal, actual load signal, load size, and related control signal.
3. A method according to claim 2, characterized in that said step S1 specifically comprises:
s11: acquiring heat supply unit data in real time;
s12: judging whether the high-pressure cylinder exhaust pressure signal is normal, if so, entering a step S13, otherwise, returning to the step S11;
s13: judging whether the actual load signal is normal, if so, entering a step S14, otherwise, returning to the step S11;
s14: judging whether the load is larger than the input load, if so, entering a step S15, otherwise, returning to the step S11;
s15: and judging whether the relevant control signals are received or not, if so, entering the step S2, and otherwise, returning to the step S11.
4. A method according to claim 2, characterized in that said loop exit conditions are:
and if the heat supply unit data meet one or more of the abnormal high-pressure cylinder exhaust pressure signal, the abnormal actual load signal, the load smaller than the withdrawal load and the received related control signals, the heat supply unit meets the loop withdrawal condition.
5. A method according to claim 1, wherein the test load range is 130MW to 170MW.
6. A heating steam pressure regulating device in a low-load period is characterized by comprising an input module, a regulating module and an exit module,
the input module acquires heat supply unit data and judges whether the input condition of a control loop is met or not, if so, the input adjusting module adjusts the input condition, and otherwise, the heat supply unit data are continuously acquired until the input condition of the loop is met;
the adjusting module acquires the unit load in real time, when the load is greater than or equal to a set peak load, the opening degree of the medium-pressure regulating valve is adjusted to 100%, otherwise, the opening degree of the medium-pressure regulating valve is adjusted to a medium-pressure regulating valve opening degree value corresponding to the unit load;
the exit module acquires heat supply unit data in real time, judges whether a loop exit condition is met or not, and stops adjusting the opening value of the middle door when the loop exit condition is met;
the medium-pressure governor opening value corresponding to the unit load is obtained through a low-load section medium-pressure governor adjustment test;
the step of the door pressure regulating adjustment test in the low-load section comprises the following steps: setting a test load area, stabilizing the high discharge pressure at a preset test pressure value, adjusting the unit load in the test load area, and obtaining the opening degree of the medium-pressure regulating valve corresponding to different unit loads.
7. A controller, comprising: memory, processor and computer program stored on the memory and executable on the processor, the processor when executing the computer program implementing a low load period heating steam pressure regulating method as claimed in any one of claims 1 to 5.
8. A computer-readable storage medium having stored thereon computer-executable instructions for performing a method of low load interval heating steam pressure regulation as claimed in any one of claims 1 to 5.
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