CN209978005U - Primary frequency modulation control system for secondary reheating unit - Google Patents
Primary frequency modulation control system for secondary reheating unit Download PDFInfo
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- CN209978005U CN209978005U CN201920706062.2U CN201920706062U CN209978005U CN 209978005 U CN209978005 U CN 209978005U CN 201920706062 U CN201920706062 U CN 201920706062U CN 209978005 U CN209978005 U CN 209978005U
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Abstract
The utility model provides a primary frequency modulation control system for secondary reheating unit, include: a heating section comprising multi-stage high pressure heaters connected in series; the water inlet section comprises a deaerator, and the deaerator is connected to the upstream of the heating section and used for supplying water to the heating section; the cooling section comprises a plurality of high-pressure external steam coolers connected in parallel, is connected to the downstream of the heating section and is used for carrying out steam cooling on water heated by the heating section; the water supply section comprises a grading coal economizer which is connected to the downstream of the cooling section and is used for supplying water to the boiler; the water supply bypass control loop comprises a regulating valve and an isolating valve which are connected in series; and the opening control device is connected with the regulating valve and controls the opening of the regulating valve according to the rotating speed deviation of the steam turbine. When the rotation speed of the unit deviates, the regulating valve in the control loop controls the opening according to the rotation speed deviation of the steam turbine, and the steam extraction amount of the bypassed high-pressure heater is reduced, so that the output of the unit is improved, and the primary frequency modulation requirement of the unit is met.
Description
Technical Field
The utility model relates to a control technical field of thermal power plant especially relates to a primary control system for secondary reheat unit.
Background
With the great development of the electric power manufacturing technology in China, high-parameter and low-heat-consumption units, particularly thermal power generating units utilizing the secondary intermediate reheating technology, are gradually put into operation. In order to ensure the stable frequency of the power grid, the thermal power generating unit must undertake the main tasks of peak shaving and frequency modulation of the power grid, and because the thermal power generating unit is usually in a low-load or rapid large-amplitude variable-load operation state at present, the thermal power generating unit must have reliable primary frequency modulation capability, and becomes an index for judging whether the thermal power generating unit is operated reliably and safely by the power grid.
For the double reheating unit, the primary frequency modulation is completed by the ultrahigh pressure cylinder regulating valve, although the response speed is high, the subsequent output of the ultrahigh pressure cylinder is insufficient due to the relatively low heat storage capacity of the boiler of the double reheating unit, and the load amplification is slowed down; meanwhile, the combustion of the boiler changes slowly, so that the load change of the unit cannot meet the requirement.
SUMMERY OF THE UTILITY MODEL
To the above problem, the utility model provides a primary control system for secondary reheat unit effectively solves the technical problem that current thermal power generating unit load change can't satisfy the requirement.
The utility model provides a technical scheme as follows:
a primary frequency modulation control system for a double reheat unit, comprising:
a heating section comprising multi-stage high pressure heaters connected in series;
the water inlet section comprises a deaerator, and the deaerator is connected to the upstream of the heating section and used for supplying water to the heating section;
the cooling section comprises a plurality of high-pressure external steam coolers connected in parallel, is connected to the downstream of the heating section and is used for evaporating and cooling the water heated by the heating section;
a water supply section comprising a staged economizer connected downstream of the cooling section for providing feed water to a boiler;
the water supply bypass control loop comprises a regulating valve and an isolating valve which are connected in series, one end of the water supply bypass control loop is connected to a water supply outlet of the high-pressure heater closest to the deaerator, and the other end of the water supply bypass control loop is connected to a water supply outlet of the high-pressure heater closest to the external steam cooler;
and the opening control device is connected with the regulating valve and controls the opening of the regulating valve according to the rotation speed deviation of the steam turbine.
Further preferably, the cooling section comprises two high-pressure external steam coolers connected in parallel.
Further preferably, the heating section comprises: first high pressure feed water heater, second high pressure feed water heater, third high pressure feed water heater and the fourth high pressure feed water heater of establishing ties each other, wherein, first high pressure feed water heater is located the low reaches of heating section, fourth high pressure feed water heater is located the upper reaches of heating section, first high pressure feed water heater's feedwater export is connected with the cooling zone, fourth high pressure feed water heater with the feedwater exit linkage of oxygen-eliminating device, just second high pressure feed water heater's air supply is in the cooling zone one high with external steam cooler steam cooling, and another high with external steam cooler steam cooling in fourth high pressure feed water heater's air supply process cooling zone.
Further preferably, the feed water bypass control circuit includes: and the regulating valve is connected between the two isolating valves, one isolating valve is connected with a water supply outlet of the fourth high-pressure heater, and the other isolating valve is connected with a water supply inlet of the grading economizer.
Further preferably, the opening degree control device includes:
the data acquisition module is used for acquiring the actual rotating speed of the steam turbine, the actual load of the unit and the inlet water supply temperature of the grading economizer;
the calculating module is used for calculating the opening value of the regulating valve according to the signals acquired by the data acquiring module;
and the opening switching module is used for controlling the opening of the regulating valve according to the opening value of the regulating valve calculated by the calculating module, and is connected with the regulating valve.
Further preferably, the data obtaining module includes:
a turbine speed measuring part for measuring an actual speed of the turbine;
the load measuring part is used for measuring the actual load of the unit and is connected with the generator;
and the temperature measuring piece is used for measuring the feed water temperature at the inlet of the grading economizer and is arranged at the feed water inlet of the grading economizer.
The utility model provides an among the primary control system for secondary reheating unit, add the feedwater bypass control circuit in current frequency modulation control system, when the deviation takes place for the unit rotational speed, governing valve in the control circuit is according to steam turbine rotational speed deviation control aperture, reduce the steam extraction volume by the high pressure feed water heater (above-mentioned second high pressure feed water heater, third high pressure feed water heater and fourth high pressure feed water heater) of bypass, promote the unit fast and exert oneself, thereby improve the unit and exert oneself, satisfy the unit primary control requirement.
Drawings
The foregoing features, technical features, advantages and embodiments are further described in the following detailed description of the preferred embodiments, which is to be read in connection with the accompanying drawings.
Fig. 1 is a schematic diagram of a primary frequency modulation control system of the present invention;
FIG. 2 is a schematic flow chart of the operation module of the present invention;
fig. 3 is a schematic diagram of a primary frequency modulation control system according to an embodiment of the present invention.
100-heating section, 200-cooling section, 300-water supply bypass control loop, 400-water inlet section, 500-water supply section, 600-opening control device, 101-first high-pressure heater, 102-second high-pressure heater, 103-third high-pressure heater, 104-fourth high-pressure heater, 201-first high-pressure external steam cooler, 202-second high-pressure external steam cooler, 301-first isolating valve, 302-second isolating valve and 303-regulating valve.
Detailed Description
In order to more clearly illustrate embodiments of the present invention or technical solutions in the prior art, specific embodiments of the present invention will be described below with reference to the accompanying drawings. It is obvious that the drawings in the following description are only examples of the invention, and that for a person skilled in the art, other drawings and embodiments can be obtained from these drawings without inventive effort.
Because the lower technical problem such as the super high pressure cylinder is exerted oneself afterwards that leads to of secondary reheat unit boiler heat accumulation ability that appears among the prior art is not enough, the load amplification slows down, the utility model provides a primary control system for secondary reheat unit when the deviation takes place for the unit rotational speed, governing valve in the control loop is according to steam turbine rotational speed deviation control aperture to reduce the steam extraction volume by the high pressure heater of bypass, promote the unit fast and exert oneself, satisfy unit primary control requirement. As shown in fig. 1, the primary frequency modulation control system includes: a heating section 100 including multi-stage high-pressure heaters connected in series (a water outlet of a previous stage high-pressure heater is connected with a water inlet of a next stage high-pressure heater); a water inlet section 400 including a deaerator connected upstream of the heating section 100 for supplying feed water to the heating section 100; the cooling section 200 comprises a plurality of high-pressure external steam coolers connected in parallel, is connected to the downstream of the heating section 100, and is used for evaporating and cooling water heated by the heating section 100; a water supply section 500 including a staged economizer connected downstream of the cooling section 200 for supplying feed water to the boiler; a feed water bypass control loop 300 including a regulating valve and an isolation valve connected in series, one end of the feed water bypass control loop 300 being connected to a feed water outlet of the high pressure heater closest to the deaerator, and the other end being connected to a feed water outlet of the high pressure heater closest to the external steam cooler; and an opening control device 600 connected to the regulating valve, the opening control device 600 controlling the opening of the regulating valve according to the deviation of the turbine rotation speed.
In the primary frequency modulation control system, the steam source of each high-pressure heater and each high-pressure external steam cooler is respectively from a steam turbine ultrahigh-pressure cylinder and a high-pressure cylinder for steam extraction/steam exhaust, and according to the equipment arrangement characteristics of the secondary reheating unit, a main economizer is positioned at the outlet of a flue at the upper part of a boiler, and a grading economizer is positioned between the outlet of a denitration device and the inlet of an air preheater. Boiler feed water passes through a grading coal economizer and then passes through a main coal economizer from the front of the boiler; the boiler flue gas enters the denitration device after passing through the main coal economizer, and enters the grading coal economizer after passing through the denitration device.
When the unit is in operation, feed water is sent out from the deaerator in the water inlet section 400, flows through the high-pressure heaters in the heating section 100 after being pressurized by the feed water pump, respectively flows through the high-pressure external steam coolers in the cooling section 200, enters the grading economizer and then enters the main economizer to provide feed water for the boiler. Meanwhile, the opening control device 600 obtains the current system operation parameters in real time, and controls the opening of the regulating valve according to the steam turbine rotation speed deviation. After the regulating valve is opened, the feed water flowing into the high pressure heater is branched, flows through the feed water bypass control loop 300, and then enters the staged economizer of the boiler through the high pressure external steam cooler in the cooling section 200. In the process, the larger the opening of the regulating valve is, the larger the water supply quantity flowing through the water supply bypass control loop 300 is, the corresponding reduction of the steam extraction quantity of the steam turbine is realized, so that the steam quantity doing work in the steam turbine is increased, the load of the unit can be quickly increased, and the primary frequency modulation requirement of the unit is met. In addition, in order to ensure that the exhaust gas temperature of the grading economizer is not excessively reduced, which causes the problem of low-temperature corrosion of the air preheater, the inlet feed water temperature of the grading economizer must reach the minimum standard of a manufacturing plant.
Opening degree control device 600 includes: the data acquisition module is used for acquiring the actual rotating speed of the steam turbine, the actual load of the unit (the active power of the generator of the steam turbine generator unit) and the inlet feed water temperature of the grading economizer; the calculating module is used for calculating the opening value of the regulating valve according to the signals acquired by the data acquiring module; and the opening switching module is used for controlling the opening of the regulating valve according to the opening value of the regulating valve calculated by the calculating module, and is connected with the regulating valve. Specifically, the data acquisition module includes: a turbine speed measuring part for measuring an actual speed of the turbine; the load measuring part is used for measuring the actual load of the unit and is connected with the generator; and the temperature measuring piece (such as a thermocouple and the like) is used for measuring the feed water temperature at the inlet of the grading economizer and is arranged at the feed water inlet of the grading economizer.
After acquiring various parameters of the unit operation, as shown in fig. 2, the calculation module, in the operation process:
1) and calculating to obtain a turbine rotating speed deviation according to the actual rotating speed of the turbine, and obtaining a target opening instruction of the regulating valve according to a preset functional relation F1(x) between the turbine rotating speed deviation and the target opening of the feed water bypass regulating valve. As shown in table 1, the function F1(x) is a function in which the opening degree of the regulating valve is increased as the deviation of the turbine rotational speed is increased:
table 1:
| steam turbine speed deviation (r/min) | -2 | -3 | -5 |
| Target opening of bypass control valve (%) | 0 | 90 | 95 |
2) The actual speed deviation of the steam turbine is calculated through a function F2(x) to generate a unit load change command, and the function F2(x) is a functional relation between the speed deviation of the steam turbine and a unit load change set value, and is shown in Table 2:
table 2:
| steam turbine speed deviation (r/min) | -2 | -11 |
| Set load change set value (MW) | 0 | 40 |
3) When the actual rotating speed deviation of the steam turbine is lower than a set value, outputting the current actual load capacity of the unit; and when the actual rotating speed deviation of the steam turbine is higher than a set value, outputting the actual load of the unit at the moment of deviation. And subtracting the current actual load of the unit from the actual load of the unit when the rotating speed deviation occurs to obtain the real-time load variation of the unit.
4) And (3) performing integral operation by taking the unit load change instruction and the unit real-time load change quantity as the input of a PID controller, and outputting a signal as a target opening instruction correction coefficient 1 of the water supply bypass regulating valve. Specifically, the PID controller performs integral operation on the deviation between the unit load change instruction and the unit real-time load change amount, and outputs a signal as a water supply bypass regulating valve target opening instruction correction coefficient 1.
5) The correction factor 2 for the target opening of the regulating valve is obtained from the correspondence between the inlet feedwater temperature of the staged economizer, which is input to the function F3(x), and the correction factor for the target opening of the regulating valve, which is denoted as the function F3 (x). In order to ensure that the temperature of the feed water entering the boiler must meet the requirements of boiler manufacturers under different working conditions of the unit, the opening of the feed water bypass regulating valve is limited. Functional relationship F3(x) is as in Table 3:
table 3:
| inlet feed water temperature (deg.C) of staged economizer | 270 | 290 | 300 | 310 |
| Correction value 2 | 0 | 0.5 | 0.9 | 1 |
6) According to the above description, the opening degree of the feedwater bypass regulating valve is corrected during the change of the unit load and the feedwater temperature (corresponding to the correction coefficient 1 and the correction coefficient 2, respectively), and a command (corresponding to the feedwater small bypass regulating valve control command in fig. 3) is sent to the feedwater bypass valve regulating manual/automatic switching module T. The regulating valve comprises a manual mode and an automatic mode, and when the regulating valve is in the manual mode, a signal is directly and manually input to control the opening degree of the water supply bypass regulating valve; when the manual/automatic switching module is regulated to be in an automatic mode through the water supply bypass valve, the water supply bypass regulating valve is controlled according to the received regulating valve opening instruction, so that the water supply flow is regulated, wherein the conditions for switching the manual mode and the automatic mode of the regulating valve are as follows: when the unit is not put into primary frequency modulation or the water supply bypass regulating valve fails, the module is switched to a manual mode.
In an example, as shown in fig. 3, the cooling section 200 includes two high-pressure external steam coolers connected in parallel, which are a first high-pressure external steam cooler 201 and a second high-pressure external steam cooler 202, respectively, and the water outlets are connected to the staged economizer, respectively; 4 high-pressure heaters which are connected in series are arranged in the heating section 100 and respectively comprise a first high-pressure heater 101, a second high-pressure heater 102, a third high-pressure heater 103 and a fourth high-pressure heater 104, wherein the first high-pressure heater is positioned at the downstream of the heating section 100, a water supply outlet is connected with the cooling section 200, the fourth high-pressure heater is positioned at the upstream of the heating section 100 and is connected with a water supply outlet of a deaerator, an air source of the second high-pressure heater is subjected to evaporative cooling through a high-pressure external steam cooler in the cooling section 200, and an air source of the fourth high-pressure heater is subjected to evaporative cooling through another high-pressure external steam cooler in the cooling section 200; each high-pressure heater and the high-pressure external steam cooler are respectively provided with an air source, such as air sources 1-6 in the figure, which are respectively from an ultrahigh-pressure cylinder and a high-pressure cylinder of the steam turbine for steam extraction/steam exhaust, and the air sources of the second high-pressure heater and the fourth high-pressure heater are high-pressure external steam cooling incoming air. The feed water bypass control circuit 300 includes: two isolation valves (including a first isolation valve 301 and a second isolation valve 302) and a regulating valve 303 are connected in series, and the regulating valve is connected between the two isolation valves, wherein one isolation valve is connected with the feed water outlet of the fourth high-pressure heater, and the other isolation valve is connected with the feed water inlet of the staged economizer.
In the working process, feed water is sent out from the deaerator in the water inlet section 400, is pressurized by the feed water pump, then enters the fourth high-pressure heater, sequentially flows through the third high-pressure heater, the second high-pressure heater and the first high-pressure heater, enters the two high-pressure external steam coolers, enters the grading economizer, and then enters the main economizer to provide the feed water for the boiler. Meanwhile, the opening control device 600 obtains the current system operation parameters in real time, and controls the opening of the water supply bypass regulating valve according to the steam turbine rotation speed deviation. After the regulating valve is opened, the feed water flowing out of the fourth high-pressure heater is shunted to the bypass, and then enters the grading economizer of the boiler through the two high-pressure external steam coolers. The water inflow in the two high-pressure external steam coolers can be set according to the actual conditions, such as 1: 1. In this example, to ensure that the unit can be boosted by 2% of the unit load, the feedwater bypass flow is 35% of the main feedwater flow when the regulating valve in the feedwater bypass control loop 300 is fully open.
It should be noted that the above embodiments can be freely combined as necessary. The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for persons of ordinary skill in the art, a plurality of improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention.
Claims (6)
1. A primary frequency modulation control system for a secondary reheating unit is characterized by comprising:
a heating section comprising multi-stage high pressure heaters connected in series;
the water inlet section comprises a deaerator, and the deaerator is connected to the upstream of the heating section and used for supplying water to the heating section;
the cooling section comprises a plurality of high-pressure external steam coolers connected in parallel, is connected to the downstream of the heating section and is used for evaporating and cooling the water heated by the heating section;
a water supply section comprising a staged economizer connected downstream of the cooling section for providing feed water to a boiler;
the water supply bypass control loop comprises a regulating valve and an isolating valve which are connected in series, one end of the water supply bypass control loop is connected to a water supply outlet of the high-pressure heater closest to the deaerator, and the other end of the water supply bypass control loop is connected to a water supply outlet of the high-pressure heater closest to the external steam cooler; and
and the opening control device is connected with the regulating valve and controls the opening of the regulating valve according to the rotation speed deviation of the steam turbine.
2. A primary frequency modulation control system according to claim 1 wherein said cooling section includes two high-plus-external steam coolers connected in parallel.
3. A primary frequency modulation control system as claimed in claim 1 or claim 2, wherein said heating section comprises: first high pressure feed water heater, second high pressure feed water heater, third high pressure feed water heater and the fourth high pressure feed water heater of establishing ties each other, wherein, first high pressure feed water heater is located the low reaches of heating section, fourth high pressure feed water heater is located the upper reaches of heating section, first high pressure feed water heater's feedwater export is connected with the cooling zone, fourth high pressure feed water heater with the feedwater exit linkage of oxygen-eliminating device, just second high pressure feed water heater's air supply is in the cooling zone one high with external steam cooler steam cooling, and another high with external steam cooler steam cooling in fourth high pressure feed water heater's air supply process cooling zone.
4. A primary frequency modulation control system as set forth in claim 3 wherein said feed water bypass control loop includes: and the regulating valve is connected between the two isolating valves, one isolating valve is connected with a water supply outlet of the fourth high-pressure heater, and the other isolating valve is connected with a water supply inlet of the grading economizer.
5. A primary frequency modulation control system according to claim 1, 2 or 4, wherein said opening degree control means comprises:
the data acquisition module is used for acquiring the actual rotating speed of the steam turbine, the actual load of the unit and the inlet water supply temperature of the grading economizer;
the calculating module is used for calculating the opening value of the regulating valve according to the signals acquired by the data acquiring module; and
and the opening switching module is used for controlling the opening of the regulating valve according to the opening value of the regulating valve calculated by the calculating module, and is connected with the regulating valve.
6. A primary frequency modulation control system according to claim 5 wherein the data acquisition module comprises:
a turbine speed measuring part for measuring an actual speed of the turbine;
the load measuring part is used for measuring the actual load of the unit and is connected with the generator;
and the temperature measuring piece is used for measuring the feed water temperature at the inlet of the grading economizer and is arranged at the feed water inlet of the grading economizer.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112910017A (en) * | 2021-01-21 | 2021-06-04 | 国网山东省电力公司电力科学研究院 | Method for improving primary frequency modulation capability of ultra-supercritical secondary reheating unit under high-power gap of power grid |
| CN114198804A (en) * | 2021-11-25 | 2022-03-18 | 广西电网有限责任公司电力科学研究院 | Steam extraction and heat supply system of steam turbine generator unit with secondary heating function |
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2019
- 2019-05-16 CN CN201920706062.2U patent/CN209978005U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112910017A (en) * | 2021-01-21 | 2021-06-04 | 国网山东省电力公司电力科学研究院 | Method for improving primary frequency modulation capability of ultra-supercritical secondary reheating unit under high-power gap of power grid |
| CN114198804A (en) * | 2021-11-25 | 2022-03-18 | 广西电网有限责任公司电力科学研究院 | Steam extraction and heat supply system of steam turbine generator unit with secondary heating function |
| CN114198804B (en) * | 2021-11-25 | 2023-02-28 | 广西电网有限责任公司电力科学研究院 | Steam extraction and heat supply system of steam turbine generator unit with secondary heating function |
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