CN109779891B - Method for optimizing backpressure and circulating water quantity of steam turbine generator unit - Google Patents
Method for optimizing backpressure and circulating water quantity of steam turbine generator unit Download PDFInfo
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Abstract
The invention relates to a method for optimizing backpressure and circulating water amount of a steam turbine generator unit, which comprises the steps of testing a group of ⑴ ambient temperature changes by 2-3 ℃ and circulating water flow by 50-100%, recording test parameters by ⑵, correcting deviation values of main steam temperature and pressure parameters by ⑶, determining the optimal circulating water flow and the optimal economic backpressure value by ⑷, making ⑸ optimal circulating water flow corresponding values of different ambient temperatures and unit loads, operating ⑹ units, verifying optimal backpressure, drawing ⑺ to obtain an optimal circulating water flow curve to obtain an optimal circulating water flow expression, correcting the circulating water flow corresponding to the optimal backpressure by ⑻, obtaining an optimal circulating water flow formula of different loads in a section by taking 3 degrees of ambient temperature change as an section by ⑼, and obtaining the optimal circulating water flow formula for adjusting backpressure of each ambient temperature by ⑽.
Description
Technical Field
The invention belongs to the technical field of energy conservation of a generator unit, and relates to a method for optimizing backpressure and circulating water quantity of a steam turbine generator unit.
Background
The pressure at the steam outlet of the low-pressure cylinder of the steam turbine is called the back pressure of the steam turbine. The change of the back pressure of the steam turbine generator unit has important influence on the circulating heat efficiency of the steam turbine generator unit, the coal consumption is increased by 0.1-0.15% when the vacuum is reduced by 1%, so that the back pressure of the steam turbine generator unit is well controlled, the steam turbine generator unit is ensured to operate under the optimal back pressure, and the method has important significance on the economy of the steam turbine generator unit. The operation backpressure of the condensing turbine in the power plant is influenced by parameters in various aspects, such as unit load, environment temperature, condenser operation condition, circulating water flow, indirect cooling system heat exchange effect and the like. The determination of the optimal economic backpressure can be calculated and deduced through a theoretical formula, or obtained through experiments, but the determination is a complex process, and the optimal economic backpressure operation cannot be maintained in real time in the current actual operation. In actual operation, the influence of factors such as the exhaust resistance of the steam turbine, the supercooling degree of condensed water, boiler make-up water and the like on the back pressure of the condenser is also considered. The optimal vacuum calculation of the condenser is very complex, and the real-time measurement, calculation and adjustment during the operation are difficult to realize. Therefore, the best backpressure value can be obtained after data are optimized through a large number of tests under different working conditions, and the best backpressure of the condenser can be actually controlled.
Disclosure of Invention
The invention aims to provide an optimization method of backpressure and circulating water quantity of a steam turbine generator unit, which obtains a relational expression corresponding to the optimal economic backpressure corresponding to typical loads at different environmental temperatures and the optimal circulating water flow at different environmental temperatures by comparing and analyzing load micro-increase, circulating pump power consumption micro-increase, steam consumption rate and coal consumption, so that the steam turbine generator unit is kept to operate in the optimal state.
The technical scheme of the invention is as follows: the method for optimizing the backpressure and the circulating water quantity of the steam turbine generator unit utilizes a computer DCS system to adjust the frequency of a main engine circulating pump in real time according to the environment temperature and the unit load and maintain the running of the steam turbine generator unit under the circulating water flow with the optimal economic backpressure value. The optimization steps are as follows:
⑴ in different load points of the turbo generator set, the environment temperature is from 16 ℃ to 33 ℃, each 2 ℃ to 3 ℃ is a group of tests, the tests are carried out between 50% (v) to 100% (v) of the circulating water flow of the main machine, the adjustment range is based on the micro increment of the power consumption of the circulating water pump, and the stable operation is carried out for 30 minutes to 1 hour after each adjustment;
⑵ recording test parameters including environment temperature, unit load, main machine circulating water flow, back pressure, main steam temperature, pressure, main steam flow, coal consumption, plant power consumption and main machine circulating water pump power consumption;
⑶ correcting the deviation values of main steam flow, main steam temperature and pressure parameters affecting coal consumption in step ⑵ according to the performance of the steam turbine generator unit;
⑷ converting the variation of the micro-increased power of the turbo generator unit according to the variation of the steam consumption rate, comparing the variation of the micro-increased power consumption of the main circulating pump to determine the optimal circulating water flow, and determining the optimal economic back pressure value of the turbo generator unit according to the optimal circulating water flow;
⑸, carrying out the test of step ⑷ under the set environmental temperature and the unit load, and making the optimal circulating water flow value of the set environmental temperature and the unit load after accumulating the test data;
⑹ the turbo generator set operates according to the recommended value of the optimal circulating water flow, and the optimal back pressure is verified according to the comprehensive power supply coal consumption and the unit heat consumption change;
⑺ obtaining the optimal circulating water flow under the set environmental temperature and different loads by testing, drawing the circulating water flow curve corresponding to different loads, and obtaining the approximate expression of the optimal circulating water flow;
⑻ calculating the optimal main machine circulating water flow under the corresponding load condition by using the approximate expression of the optimal circulating water flow in step ⑺, verifying and correcting the circulating water flow corresponding to the optimal back pressure by a comprehensive cost coal consumption method;
⑼, setting the environment temperature to an interval of every 3 ℃, obtaining an approximate formula of the optimal circulating water flow corresponding to each interval, and finally obtaining all corresponding optimal circulating water flow formulas of which the environment temperature is 16-33 ℃ and the unit load is 175-350 MW;
⑽ adjust the optimum circulating water flow rate for backpressure under load for each ambient temperature interval as determined in step ⑼.
In step ⑸, the ambient temperature is set to 16 ℃, 20 ℃, 24 ℃, 28 ℃ and 32 ℃, the unit load is set to 175MW, 250MW, 200MW, 300MW and the optimal circulating water flow at 23 ℃ in step ⑺ of 350 MW. is approximately expressed as:
Dw＝0.00002W3-0.0099W2+2.1881W-105.92
wherein: dw is the circulating water flow,% (v);
w is the unit load, MW.
In step ⑼, the optimal circulating water flow formulas corresponding to 175-350 MW of each 3 degrees interval are as follows:
16～18℃：Dw＝a1w3–b1w2+c1w–d1；
19～21℃：Dw＝a2w3–b2w2+c2w–d2；
22～24℃：Dw＝0.00002w3-0.0099w2+2.1881w-105.92；
25～27℃：Dw＝a4w3–b4w2+c4w–d4；
28～30℃：Dw＝a5w3–b5w2+c5w–d5；
31～33℃：Dw＝a6w3–b6w2+c6w–d5；
wherein: dw is the circulating water flow,% (v);
w is the unit load, MW;
ai. bi and ci are constants, i is 1, 2, 3, 4, 5 and 6.
When the load and the ambient temperature of the unit are fixed, the variable influencing the backpressure of the unit is mainly the circulating water flow. When the power of the circulating pump is increased, the circulating water quantity of the condenser is also increased, and the back pressure of the steam turbine is reduced, the power of the steam turbine unit is increased. On the contrary, the power of the circulating pump is reduced, the circulating water quantity of the condenser is also reduced, and when the back pressure of the steam turbine rises, the power of the steam turbine unit is reduced. When the increase of the power of the circulating pump and the power of the steam turbine reaches the best economical efficiency, namely, the back pressure value generated by the condensing steam turbine is the best operation back pressure.
Variables influencing the backpressure of the condenser mainly include unit load, ambient temperature and circulating water flow. Under the condition of certain environmental temperature, the unit load changes along with AGC, and the optimal main machine circulating water flow is kept by adjusting the running quantity of the main machine circulating water pumps and the frequency of the variable frequency pump.
The invention relates to a method for optimizing backpressure and circulating water quantity of a steam turbine generator unit, which comprises the steps of testing different unit loads and environmental temperatures, correcting deviation values of main steam temperature and pressure parameters influencing main steam flow and coal consumption according to unit performances, determining the optimal circulating water flow optimal economic backpressure value, obtaining a relational expression corresponding to the optimal economic backpressure corresponding to typical loads at different environmental temperatures, the optimal circulating water flow at different environmental temperatures and the optimal circulating water flow of adjusting backpressure under the load condition in each environmental temperature interval, enabling the steam turbine generator unit to operate in the optimal state, being beneficial to reducing the comprehensive coal consumption rate and the main unit circulating water consumption rate, efficiently utilizing energy and improving the economy of the steam turbine generator unit.
Drawings
FIG. 1 is a schematic view of the process for optimizing the back pressure and the amount of circulating water of the steam turbine generator unit according to the present invention;
FIG. 2 is a graph of optimum circulating water flow for different loads.
Detailed Description
The present invention will be described in detail with reference to the following examples and drawings. The scope of protection of the invention is not limited to the embodiments, and any modification made by those skilled in the art within the scope defined by the claims also falls within the scope of protection of the invention.
The invention relates to a method for optimizing backpressure and circulating water quantity of a steam turbine generator unit, which utilizes a computer DCS system to adjust the frequency of a main machine circulating pump in real time according to the environmental temperature and the load of the unit and maintain the unit to operate under the circulating water flow with the optimal economic backpressure value.
Variables influencing the backpressure of the condenser mainly include unit load, ambient temperature and circulating water flow. Under the condition of certain environmental temperature, the unit load changes along with AGC, and the optimal main machine circulating water flow is kept by adjusting the running quantity of the main machine circulating water pumps and the frequency of the variable frequency pump. As shown in fig. 1, the optimization steps are as follows:
⑴ in different load points of the turbo generator set, the environment temperature is from 16 ℃ to 33 ℃, each 2 ℃ to 3 ℃ is a group of tests, the tests are carried out between 50% (v) to 100% (v) of the circulating water flow of the main machine, the adjustment range is based on the micro increment of the power consumption of the circulating water pump, and the stable operation is carried out for 30 minutes to 1 hour after each adjustment;
⑵ recording test parameters including environment temperature, unit load, main machine circulating water flow, back pressure, main steam temperature, pressure, main steam flow, coal consumption, plant power consumption and main machine circulating water pump power consumption;
⑶ correcting the deviation values of main steam flow, main steam temperature and pressure parameters affecting coal consumption in step ⑵ according to the performance of the steam turbine generator unit;
⑷ converting the variation of the micro-increased power of the turbo-generator unit according to the variation of the steam consumption rate, comparing the variation of the micro-increased power consumption of the main engine circulating pump to determine the optimal circulating water flow, determining the optimal economic backpressure value of the unit according to the optimal circulating water flow, when the micro-increased power consumption of the main engine circulating pump is equal to the micro-increment of the unit load by increasing the main engine circulating water flow, the circulating water flow of the unit is the critical point of the optimal circulating water flow, and the optimal economic backpressure value of the unit is determined by combining the variation of the comprehensive coal consumption, as shown in table 1, when the environmental temperature is 25 ℃, the unit load is 300MW, the rated flow of the main engine circulating water is 85% (v), and the corresponding backpressure.
Table 1 unit data corresponding to the ambient temperature of 25 ℃ and the unit load of 300MW
⑸ setting the environmental temperature at 16 ℃, 20 ℃, 24 ℃, 28 ℃ and 32 ℃, setting the unit load at 175MW, 250MW, 200MW, 300MW and 350MW, carrying out the test of step ⑷, and making the optimal circulating water flow values of the set environmental temperature and the unit load after accumulating the test data, wherein Table 2 is the optimal circulating water flow values under the environmental temperature and the unit load;
TABLE 2 optimal circulating water flow values under set environmental temperature and unit load conditions
⑹ the steam turbine generator unit operates according to the recommended value of the optimal circulating water flow, and the optimal back pressure is verified according to the comprehensive power supply coal consumption and the heat consumption change of the steam turbine generator unit;
⑺ test to obtain the optimum circulation water flow under the set environment temperature and different loads, and drawing the circulation water flow curve corresponding to different loads to obtain the optimum circulation water flow approximate expression, drawing the circulation water flow curve corresponding to different loads when the environment temperature is constant, and FIG. 2 is the optimum circulation water flow trend corresponding to different loads when the environment temperature is 23 deg.C, and the optimum circulation water flow approximate expression is obtained from FIG. 2:
Dw＝0.00002W3-0.0099W2+2.1881W-105.92
wherein: dw is the circulating water flow,% (v);
w is the unit load, MW;
⑻ calculating the optimal main machine circulating water flow under the corresponding load condition by using the approximate expression of the optimal circulating water flow in step ⑺, verifying and correcting the circulating water flow corresponding to the optimal back pressure by a comprehensive cost coal consumption method;
⑼, setting the environment temperature to an interval of every 3 degrees, obtaining an approximate formula of the optimal circulating water flow corresponding to each interval, and finally obtaining all corresponding optimal circulating water flow formulas of the environment temperature of 16-33 ℃ and the unit load of 175-350 MW, wherein all corresponding optimal circulating water flow formulas of 175-350 MW of every 3 degrees are as follows:
16～18℃：Dw＝a1w3–b1w2+c1w–d1；
19～21℃：Dw＝a2w3–b2w2+c2w–d2；
22～24℃：Dw＝0.00002w3-0.0099w2+2.1881w-105.92；
25～27℃：Dw＝a4w3–b4w2+c4w–d4；
28～30℃：Dw＝a5w3–b5w2+c5w–d5；
31～33℃：Dw＝a6w3–b6w2+c6w–d5；
wherein: dw is the circulating water flow,% (v);
w is the unit load, MW;
ai. bi and ci are constants.
⑽ adjust the optimum circulating water flow rate for backpressure under load for each ambient temperature interval as determined in step ⑼.
And determining the optimal circulating water flow under different working conditions through test data under different working conditions and different environmental temperatures for a long time, and completing the optimization of the optimal economic backpressure of the steam turbine generator unit after the analysis and verification of a comprehensive cost coal consumption method to obtain optimal circulating water flow formulas corresponding to all working conditions. A main machine circulating water flow regulating loop is arranged in the DCS, the frequency of a main machine circulating pump is regulated in real time according to the environment temperature and the machine set load, the steam turbine generator unit is maintained to operate under the optimal economic backpressure value, and the real-time control of the optimal economic backpressure of the steam turbine generator unit is achieved.
Claims (4)
1. A method for optimizing backpressure and circulating water quantity of a steam turbine generator unit utilizes a computer DCS system to adjust the frequency of a main engine circulating pump in real time according to the environmental temperature and the load of the unit and maintain the unit to operate under the circulating water flow with the optimal economic backpressure value, and is characterized in that: the optimization steps are as follows:
⑴ in different load points of the turbo generator set, the environment temperature is from 16 ℃ to 33 ℃, each 2 ℃ to 3 ℃ is a group of tests, the tests are carried out between 50% (v) to 100% (v) of the circulating water flow of the main machine, the adjustment range is based on the micro increment of the power consumption of the circulating water pump, and the stable operation is carried out for 30 minutes to 1 hour after each adjustment;
⑵ recording test parameters including environment temperature, unit load, main machine circulating water flow, back pressure, main steam temperature, pressure, main steam flow, coal consumption, plant power consumption and main machine circulating water pump power consumption;
⑶ correcting the deviation values of main steam flow, main steam temperature and pressure parameters affecting coal consumption in step ⑵ according to the performance of the steam turbine generator unit;
⑷ converting the variation of the micro-increased power of the turbo generator set according to the variation of the steam consumption rate, comparing the variation of the micro-increased power consumption of the main circulating pump to determine the optimal circulating water flow, and determining the optimal economic back pressure value of the unit according to the optimal circulating water flow;
⑸, carrying out the test of step ⑷ under the set environmental temperature and the unit load, and making the optimal circulating water flow value of the set environmental temperature and the unit load after accumulating the test data;
⑹ the steam turbine generator unit operates according to the recommended value of the optimal circulating water flow, and the optimal back pressure is verified according to the comprehensive power supply coal consumption and the heat consumption change of the steam turbine generator unit;
⑺ obtaining the optimal circulating water flow under the set environmental temperature and different loads by testing, drawing the circulating water flow curves corresponding to different loads, and obtaining the approximate expression of the optimal circulating water flow;
⑻ calculating the optimal main machine circulating water flow under the corresponding load condition by using the approximate expression of the optimal circulating water flow in step ⑺, and correcting the circulating water flow corresponding to the optimal back pressure by verifying through a comprehensive cost coal consumption method;
⑼, setting the environment temperature to an interval of every 3 ℃, obtaining an approximate formula of the optimal circulating water flow corresponding to each interval, and finally obtaining all corresponding optimal circulating water flow formulas of which the environment temperature is 16-33 ℃ and the unit load is 175-350 MW;
⑽ adjust the optimum circulating water flow rate for backpressure under load for each ambient temperature interval as determined in step ⑼.
2. The method for optimizing back pressure and circulating water amount of a steam turbine generator unit as claimed in claim 1, wherein the ambient temperature is set to 16 ℃, 20 ℃, 24 ℃, 28 ℃ and 32 ℃ in the step ⑸, and the set load is set to 175MW, 250MW, 200MW, 300MW and 350 MW.
3. The method for optimizing back pressure and circulating water amount of a steam turbine generator unit as claimed in claim 1, wherein the approximate expression of the optimal circulating water flow rate at 23 ℃ in the step ⑺ is as follows:
Dw＝0.00002W3-0.0099W2+2.1881W-105.92
wherein: dw is the circulating water flow,% (v);
w is the unit load, MW.
4. The method for optimizing back pressure and circulating water amount of a steam turbine generator unit as claimed in claim 1, wherein in the step ⑼, all corresponding optimal circulating water flow formulas of 175-350 MW for every 3 degrees are as follows:
16～18℃：Dw＝a1w3–b1w2+c1w–d1；
19～21℃：Dw＝a2w3–b2w2+c2w–d2；
22～24℃：Dw＝0.00002w3-0.0099w2+2.1881w-105.92；
25～27℃：Dw＝a4w3–b4w2+c4w–d4；
28～30℃：Dw＝a5w3–b5w2+c5w–d5；
31～33℃：Dw＝a6w3–b6w2+c6w–d5；
wherein: dw is the circulating water flow,% (v);
w is the unit load, MW;
ai. bi and ci are constants.
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| CN113188341A (en) * | 2021-05-31 | 2021-07-30 | 华能威海发电有限责任公司 | Multi-dimensional online optimization control method for optimal vacuum of condenser |
| CN113432370A (en) * | 2021-07-05 | 2021-09-24 | 蔚海建 | Circulating water system with balanced supply and demand under different loads and water supply temperatures and control method |
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