CN103383112A - Water-feeding pump turbine control method and system - Google Patents
Water-feeding pump turbine control method and system Download PDFInfo
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- CN103383112A CN103383112A CN2013103382855A CN201310338285A CN103383112A CN 103383112 A CN103383112 A CN 103383112A CN 2013103382855 A CN2013103382855 A CN 2013103382855A CN 201310338285 A CN201310338285 A CN 201310338285A CN 103383112 A CN103383112 A CN 103383112A
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Abstract
The invention provides a water-feeding pump turbine control method and system. According to the water-feeding pump turbine control method and system, the air feeding quantity is determined according to load power of a water-feeding pump turbine. The method comprises the steps of calculating the air feeing quantity according to an operation value of speed-limited turbine load power MW after functional operation, a final value obtained after filtering processing of the operation value of the speed-limited turbine load power MW after functional operation, blowing air quantity or minimum air quantity instruction value A=25; and generating air feeding control instructions according to the calculated air feeding quantity. Original tradition is broken by a modified control loop, and the air feeding quantity is determined according to a system load. When a load of machine set is certain, output of an air feeder is maintained corresponding to a certain air feeding quantity, oxygen amount signals serve as auxiliary adjustment for air feeding simultaneously, so that fluctuation of the air quantity caused by total fuel amount changes is eliminated, and burning in a hearth is stabilized.
Description
Technical field
The present invention relates to field of mechanical technique, refer to especially a kind of Feed Water Pump Turbine Control method and system.
Background technology
The Present Domestic thermal power generation is very important generation mode always, for better control combustion, need to blow by pressure fan when thermal power generation.In prior art, pressure fan is to carry out automatically controlling according to the working condition of total system, and the air-supply instruction is determined according to following parameter: the value after filtering is processed, total fuel quantity TOTAL FULE FLOW ON JD draw air quantity required value after filtering is processed through the Function generator computing through air quantity required value that functional operation draws through air quantity required value that functional operation draws, fuel master control instruction in fuel master control instruction.Purge air quantity or minimum air quantity command value A=25.
Its logic flow as shown in Figure 1, this method is under coordination mode, fuel master control instruction comes from the control output that boiler is coordinated PID, influence factor has load deviation Δ MW and main vapour pressure deviation delta PT.Total fuel quantity TOTAL FULE FLOW ON JD when not throwing oil directly depends on on-the-spot machine supplying powder speed feedback.Under practical operation situation, if the unexpected variation of ature of coal, the fuel combustion release heat reduces, the corresponding reduction of fire box temperature, in the situation that the constant machine supplying powder rotating speed of boiler load increases thereupon, produce loop air output by former air quantity this moment will inevitably sharply increase, and a large amount of cold wind enters the further reduction that burner hearth can cause fire box temperature, thereby causes combustion conditions further to worsen.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of can ature of coal the variation and causes the air-supply instruction significantly to change to cause burn deterioration better feed pump turbine is controlled to improve the Feed Water Pump Turbine Control method and system of combustion efficiency.
For solving the problems of the technologies described above, embodiments of the invention provide a kind of Feed Water Pump Turbine Control method, comprising: determine air output according to the bearing power of described feed pump turbine.
Preferred as technique scheme, described method also comprises:
Judge that current steam turbine load power whether greater than predetermined threshold value, if it is determines air output according to the bearing power of described feed pump turbine; If otherwise based on fuel instruction or total fuel quantity are determined air output.
Preferred as technique scheme, described method is specially:
End value, purge air quantity or minimum air quantity command value A=25 after filtering is processed calculates air output through the operation values after functional operation through the operation values after functional operation, steam turbine load power MW after speed limit according to the steam turbine load power MW after speed limit;
Generate the air-supply control instruction according to the described air output that calculates.
Preferred as technique scheme, described method also comprises:
Utilization is taken from the differential correction signal of total fuel quantity variation of the revised total fuel quantity of drum pressure differential described air output is adjusted.
Preferred as technique scheme, described method also comprises:
Utilization is taken from the differential correction signal of total fuel quantity variation of the revised total fuel quantity of drum pressure differential described air output is adjusted.
Preferred as technique scheme, described method also comprises: according to main steam temperature and reheat steam temperature so that air output is adjusted.
The beneficial effect of technique scheme of the present invention is as follows: the amended control loop of the present invention has been broken original tradition, adopts the load of system to determine air output.Concrete, adopt " the steam turbine load instruction after speed limit " and " after the steam turbine load instruction filtering after speed limit " and " minimum air quantity " to produce the air-supply instruction.In the certain situation of the load of unit, corresponding certain air output keeps exerting oneself of pressure fan, allows simultaneously " oxygen amount " signal transfer as the pair of air-supply, gets rid of total fuel quantity with this and changes the fluctuation that causes air quantity, stablizes the burning in burner hearth.The control loop of the prior art of comparing determines the air quantity instruction by fuel command or total fuel quantity, can solve when load is constant fuel quantity and significantly change the hearth combustion operating mode that causes air quantity sharply to change to cause and worsen.
Description of drawings
Fig. 1 is the logical schematic of existing Feed Water Pump Turbine Control method;
Fig. 2 is the logical schematic of the Feed Water Pump Turbine Control method of the embodiment of the present invention.
The specific embodiment
For making the technical problem to be solved in the present invention, technical scheme and advantage clearer, be described in detail below in conjunction with the accompanying drawings and the specific embodiments.
Embodiments of the invention provide a kind of Feed Water Pump Turbine Control method, comprising: determine air output according to the bearing power of described feed pump turbine.
The amended control loop of the present invention has been broken original tradition, adopts the load of system to determine air output.Concrete, adopt " the steam turbine load instruction after speed limit " and " after the steam turbine load instruction filtering after speed limit " and " minimum air quantity " to produce the air-supply instruction.In the certain situation of the load of unit, corresponding certain air output keeps exerting oneself of pressure fan, allows simultaneously " oxygen amount " signal transfer as the pair of air-supply, gets rid of total fuel quantity with this and changes the fluctuation that causes air quantity, stablizes the burning in burner hearth.The control loop of the prior art of comparing determines the air quantity instruction by fuel command or total fuel quantity, can solve when load is constant fuel quantity and significantly change the hearth combustion operating mode that causes air quantity sharply to change to cause and worsen.
Wherein, described method also comprises: judge that current steam turbine load power whether greater than predetermined threshold value, if it is determines air output according to the bearing power of described feed pump turbine; If otherwise based on fuel instruction or total fuel quantity are determined air output.
Amended like this Feed Water Pump Turbine Control method still keeps original air-supply command control method, the method that adopts existing based on fuel or quantity combusted to control during lower than 150MW when load, and when loading greater than 150MW by the duty control method that switches to the embodiment of the present invention.
Concrete, its logic is specially as shown in Figure 2:
Step 1, end value, purge air quantity or the minimum air quantity command value A=25 after filtering is processed calculates air output through the operation values after functional operation through the operation values after functional operation, steam turbine load power MW after speed limit according to the steam turbine load power MW after speed limit;
Step 2, generate the air-supply control instruction according to the described air output that calculates.
Wherein, in logic chart as shown in Figure 2, can also utilize the differential correction signal of total fuel quantity variation of taking from the revised total fuel quantity of drum pressure differential that described air output is adjusted.
After adding this corrected signal, during the ature of coal variation, the machine supplying powder rotating speed can significantly rise, and the drum pressure differential value can reduce, and this moment is the relative air output that reduces suitably; When the disconnected pin of machine supplying powder or lower powder when smooth, the rotating speed of all operation machine supplying powders all can abnormal ascending, but actual fuel quantity do not change, and the drum pressure differential of this moment can reduce, suitable elimination or reduced the ANOMALOUS VARIATIONS of air quantity is conducive to the stable operation of boiler; Unit load is stable, and in the situation that the actual speed of machine supplying powder fluctuates widely, increase suitable, by a small margin or reduce exerting oneself of pressure fan adapts to the variation of boiler internal combustion with this.When introducing this corrected signal, key will set speed and the amplitude of adjusting, will calculate in addition the time of filtering, makes it to be complementary with the process of regulating.
Wherein, described method also comprises: according to main steam temperature and reheat steam temperature so that air output is adjusted.
In sum, in embodiments of the present invention, cause burn deterioration for fear of causing the air-supply instruction significantly to change due to the ature of coal variation, modification scheme proposes the automatic control instruction of amended air-supply and is produced through general election by lower column signal, its principle has adopted the following parameter to adjust air output as shown in Figure 2:
Power instruction WM after speed limit is through the functional operation value;
Power instruction WM after speed limit is through the value of functional operation value after filtering is processed;
Purge air quantity or minimum air quantity command value A=25.
In addition, the differential correction that main steam temperature is proofreaied and correct and total fuel quantity changes is introduced in new loop.The air quantity instruction that draws so both can guarantee purge air quantity before ignition of the boiler and ignition of the boiler initial stage fuel quantity minimum airflow value hour, can guarantee again the relatively reasonable stable of under various operating modes air quantity command value.
The impact that in new loop, ature of coal changes the air-supply instruction weakens greatly, has avoided causing air quantity significantly to change because ature of coal changes, thereby has played the effect of smooth combustion.
2, air-supply autocontrol feature after the transformation
2.1 the modification of air-supply instruction
Mainly determine the air quantity instruction by fuel command or total fuel quantity in former control loop, the constant fuel quantity of load significantly changes and causes air quantity sharply to change, deterioration hearth combustion operating mode.Amended control loop has been broken original tradition, adopts " the steam turbine load instruction after speed limit " and " after the steam turbine load instruction filtering after speed limit " and " minimum air quantity " to produce the air-supply instruction.In the certain situation of the load of unit, corresponding certain air output keeps exerting oneself of pressure fan, allows simultaneously " oxygen amount " signal transfer as the pair of air-supply, gets rid of total fuel quantity with this and changes the fluctuation that causes air quantity, stablizes the burning in burner hearth.
In addition, amended air-supply automatic control loop still keeps original air-supply instruction and produces loop (fuel control loop), drops into the fuel control loop when loading lower than 150MW, manually switches to the load control loop by the operations staff when loading greater than 150MW.
2.2 increase the pair accent effect of large oxygen quantity
Because the adjusting leeway of present oxygen amount is 20% left and right, by the data analysis at scene, its regulating action of increase that should be suitable is revised the control characteristic at oxygen station, accelerates the governing speed of oxygen amount, eliminates or reduce the phenomenon of air quantity overshoot with this.
2.3 increase the differential correction that total fuel quantity changes
The differential correction signal that total fuel quantity changes is taken from the revised total fuel quantity of drum pressure differential.After adding this corrected signal, during the ature of coal variation, the machine supplying powder rotating speed can significantly rise, and the drum pressure differential value can reduce, and this moment is the relative air output that reduces suitably; When the disconnected pin of machine supplying powder or lower powder when smooth, the rotating speed of all operation machine supplying powders all can abnormal ascending, but actual fuel quantity do not change, and the drum pressure differential of this moment can reduce, suitable elimination or reduced the ANOMALOUS VARIATIONS of air quantity is conducive to the stable operation of boiler; Unit load is stable, and in the situation that the actual speed of machine supplying powder fluctuates widely, increase suitable, by a small margin or reduce exerting oneself of pressure fan adapts to the variation of boiler internal combustion with this.
When introducing this corrected signal, key will set speed and the amplitude of adjusting, will calculate in addition the time of filtering, makes it to be complementary with the process of regulating.
2.4 increase the corrective loop of main stripping temperature
In actual motion, the impact that the variation of air quantity changes main steam temperature and reheat steam temperature adds the correcting action of main steam temperature, to realize in the situation of equal load and equal caloric value still greatly, suitable adjustment air output is to satisfy the parameter of boiler live steam.By inquiry " carbonated drink characteristic curve ", can determine its corrected parameter.
2.5 the switching of logical circuit automatically
When boiler in start-up course, because unit also is not incorporated into the power networks, zero load instruction in this time, for the sake of security, the air-supply automatic loop adopts original loop, namely controls the motor-driven accent of air-supply by total fuel quantity and boiler instruction.Simultaneously, in the process of underload, also controlled by former logic, when load reaches 150MW, carry out manual switchover to the control loop of loading by the operations staff.
In addition, when the operations staff did not drop into coordination mode, steam turbine was thrown loop of power circuit usually, and the setting of its load comes from " DEH main menu ".So for this situation, the unit load instruction is the manual setting value of operations staff in " DEH main menu ".
2.6 the logic Modification under abnormal conditions
Only blow automatically, other are all in manual mode
" the ULD instruction after rate limit " as regulated variable, kept former rate limit loop, height limit circuit and close to increase to close subtracting the loop, and increase by one tunnel rate limit loop and close to subtract to close and increase the loop, special control instruction as air-supply.Will be without the signal of " coordinate under RB " as the rate limit condition.
Height adds and is cut to the crude fuel control loop when extremely withdrawing from
When height adds when extremely withdrawing from, in the situation that equal load, corresponding fuel quantity is not identical yet, and the function of coal-air ratio also will change, so, high adding occur to be cut to the crude fuel control loop when out of service.
When the RB signal produces.
Due in the RB situation, the instruction of ULD load has its independent cover automatic control loop, does not affect improved logical circuit.
The above is the preferred embodiment of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from principle of the present invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (6)
1. a Feed Water Pump Turbine Control method, is characterized in that, comprising: determine air output according to the bearing power of described feed pump turbine.
2. Feed Water Pump Turbine Control method according to claim 1, is characterized in that, described method also comprises:
Judge that current steam turbine load power whether greater than predetermined threshold value, if it is determines air output according to the bearing power of described feed pump turbine; If otherwise based on fuel instruction or total fuel quantity are determined air output.
3. Feed Water Pump Turbine Control method according to claim 1 and 2, is characterized in that, described method is specially:
End value, purge air quantity or minimum air quantity command value A=25 after filtering is processed calculates air output through the operation values after functional operation through the operation values after functional operation, steam turbine load power MW after speed limit according to the steam turbine load power MW after speed limit;
Generate the air-supply control instruction according to the described air output that calculates.
4. Feed Water Pump Turbine Control method according to claim 2, is characterized in that, described method also comprises:
Utilization is taken from the differential correction signal of total fuel quantity variation of the revised total fuel quantity of drum pressure differential described air output is adjusted.
5. Feed Water Pump Turbine Control method according to claim 2, is characterized in that, described method also comprises:
Utilization is taken from the differential correction signal of total fuel quantity variation of the revised total fuel quantity of drum pressure differential described air output is adjusted.
6. Feed Water Pump Turbine Control method according to claim 2, is characterized in that, described method also comprises: according to main steam temperature and reheat steam temperature so that air output is adjusted.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104633648A (en) * | 2014-12-05 | 2015-05-20 | 国家电网公司 | Analog quantity control method for feed pump set with different powers |
| CN112797437A (en) * | 2021-02-03 | 2021-05-14 | 华能武汉发电有限责任公司 | Intelligent air supply control method, equipment and storage medium |
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| CN101725999A (en) * | 2009-12-11 | 2010-06-09 | 中国电力科学研究院 | Method for controlling load of biomass vibration grate boiler |
| CN102032588A (en) * | 2009-09-28 | 2011-04-27 | 上海工业锅炉研究所 | Controlling, adjusting and remote monitoring system for fuel gas-fired boiler |
| CN202675352U (en) * | 2012-07-20 | 2013-01-16 | 大唐信阳发电有限责任公司 | Automatic air supply control system of boiler |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20080057451A1 (en) * | 2006-08-30 | 2008-03-06 | Miura Co., Ltd. | Boiler and combustion control method |
| CN102032588A (en) * | 2009-09-28 | 2011-04-27 | 上海工业锅炉研究所 | Controlling, adjusting and remote monitoring system for fuel gas-fired boiler |
| CN101725999A (en) * | 2009-12-11 | 2010-06-09 | 中国电力科学研究院 | Method for controlling load of biomass vibration grate boiler |
| CN202675352U (en) * | 2012-07-20 | 2013-01-16 | 大唐信阳发电有限责任公司 | Automatic air supply control system of boiler |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104633648A (en) * | 2014-12-05 | 2015-05-20 | 国家电网公司 | Analog quantity control method for feed pump set with different powers |
| CN112797437A (en) * | 2021-02-03 | 2021-05-14 | 华能武汉发电有限责任公司 | Intelligent air supply control method, equipment and storage medium |
| CN112797437B (en) * | 2021-02-03 | 2022-03-22 | 华能武汉发电有限责任公司 | Intelligent air supply control method, equipment and storage medium |
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