CN110348164B - Correction method for designed heat supply working condition diagram of thermoelectric unit - Google Patents
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Abstract
The invention discloses a method for correcting a designed heat supply working condition diagram of a thermoelectric unit, which selects an actual operation working condition breaking through the designed heat supply working condition diagram operation interval from the real historical operation data of the unit, and corrects the original designed heat supply working condition diagram by using the working condition, thereby greatly widening the output interval of the unit in the heat supply state; the real operation data of the unit is used for correcting the heat supply working condition diagram of the unit, on one hand, the output condition of the thermoelectric unit in the heat supply state can be more accurately reflected, reference is provided for operators, on the other hand, the operation interval of the unit is widened, the load carrying capacity of the unit is improved, the unit can participate in more auxiliary services to obtain peak regulation compensation benefits, and meanwhile, new energy consumption is promoted.
Description
Technical Field
The invention relates to a method for correcting a designed heat supply working condition diagram of a thermoelectric unit, and belongs to the technical field of thermoelectric unit design.
Background
The thermoelectric power generation unit is a unit that generates power and supplies heat. The thermoelectric power generating unit generally uses a steam turbine, and the steam extraction or exhaust of the steam turbine is used for supplying heat while the steam turbine is generating electricity.
The designed heat supply working condition diagram of the thermoelectric power unit represents the relationship among main steam flow, electric power, heat load of the unit and other parameters influencing the economy of the unit in a curve mode, the output interval of a steam turbine in an external heat supply state can be inquired by utilizing the designed heat supply working condition diagram of the unit, the use is simple and convenient, and the application is also high in accuracy in practical engineering application, so that the working condition diagram is very wide in the fields of design and operation of a thermoelectric power plant, on-line monitoring of peak regulation capacity of the thermoelectric power unit and the like.
The designed heat supply working condition diagram of the thermoelectric unit is provided by a steam turbine manufacturer and is obtained by adopting variable working condition calculation according to the design parameters of the unit, but the heat supply working condition diagram given by the manufacturer is generally conservative due to the protection of the steam turbine, and in addition, the difference between the parameters of the actual operation of the unit and the design parameters is large, so the unit always breaks through the operation working condition of the designed heat supply working condition diagram in the actual operation, and the designed heat supply working condition diagram needs to be corrected, thereby being closer to the actual operation condition of the unit.
Disclosure of Invention
Aiming at the defects of the method, the invention provides a method for correcting a designed heat supply working condition diagram of a thermoelectric unit, which can correct the designed heat supply working condition diagram of the thermoelectric unit to enable the designed heat supply working condition diagram to be closer to the actual operation condition of the thermoelectric unit.
The technical scheme adopted for solving the technical problems is as follows:
the embodiment of the invention provides a method for correcting a designed heat supply working condition diagram of a thermoelectric unit, which comprises the following steps:
step 1: designing a heat supply working condition diagram by using a thermoelectric unit, and acquiring the maximum power and the minimum power of the thermoelectric unit under several groups of typical heat supply steam extraction quantities;
step 2: the method comprises the steps of calling DCS historical data of steam extraction flow and electric power of a thermoelectric unit in a latest heating season, dividing the data into a plurality of time periods at an interval period of one hour, wherein each time period represents a steam extraction working condition, and calculating average steam extraction flow Q1 … Qn and actual operation electric power P1 … Pn of a generator under each steam extraction working condition;
and step 3: respectively judging which two typical heat supply steam extraction working conditions belong to the different steam extraction working conditions, and calculating the maximum theoretical electric power P1max … Pnmax and the minimum theoretical electric power P1min … Pnmin which the unit can generate at the heat supply steam extraction quantity by adopting a linear interpolation method;
and 4, step 4: comparing the actual operation electric power P1 … Pn in the step 2 with the minimum theoretical electric power P1min … Pnmin in the step 3, screening out an extraction working condition that the actual operation electric power is smaller than the minimum theoretical electric power, and screening out an extraction working condition of the minimum actual operation electric power;
and 5: and correcting the designed heat supply working condition diagram of the thermoelectric unit according to the minimum actual operation electric power Pmin 'and the corresponding steam extraction quantity Qmin'.
As a possible implementation manner of this embodiment, in step 1, the abscissa of the thermal power unit design heat supply operating condition diagram represents electric power, the ordinate represents main steam flow, the closed region surrounded by several lines in the middle of the operating condition diagram is the operating region of the unit under the heat supply operating condition, wherein several oblique lines in the middle are equal steam extraction amount lines of typical steam extraction amount, the uppermost straight line is the maximum main steam flow limiting line, the maximum electric power of the unit is limited, the lowermost straight line is the middle exhaust temperature limiting line (minimum input heat supply main steam flow limiting line), the leftmost line is the minimum exhaust steam flow limiting line, the two limit the minimum electric power of the unit, the abscissa value corresponding to the intersection point of the equal steam extraction amount line and the maximum main steam flow limiting line is the maximum electric power that the unit can generate under the steam extraction amount, and the abscissa value corresponding to the intersection point of the equal steam extraction amount line and the middle exhaust temperature limiting line or the minimum steam flow limiting line of the low pressure cylinder is the minimum electric power that the unit can generate under the steam extraction amount.
As a possible implementation manner of this embodiment, a calculation formula of the linear difference method is as follows:
in the formula:
q is the actual heat supply steam extraction quantity of the unit, t/h; q i Designing a typical steam extraction quantity value of an ith group in a heat supply working condition diagram, t/h, for the unit; p is the corresponding maximum power or minimum power, t/h, of the unit under the actual heat supply steam extraction quantity; p i Designing the maximum power or the minimum power, MW corresponding to the ith group of typical steam extraction in a heat supply working condition diagram for the unit; i =1,2, … n.
As a possible implementation manner of this embodiment, the step 5 specifically includes the following steps:
step 51: drawing an equal extraction steam quantity line corresponding to the selected minimum actual operation electric power extraction steam quantity in a design heat supply working condition diagram;
step 52: making points corresponding to the steam extraction working conditions with the minimum actual electric power in the step 4 at the periphery of the designed heat supply working condition diagram operation interval;
step 53: making a corrected middle exhaust temperature limit line at the periphery of the operation interval of the designed heat supply working condition diagram;
step 54: making a corrected minimum exhaust steam flow limiting line of the low-pressure cylinder at the periphery of the operation interval of the designed heat supply working condition diagram;
step 55: and (4) making a corrected operation interval at the periphery of the operation interval of the designed heat supply working condition diagram, and finishing the correction of the designed heat supply working condition diagram of the unit.
As a possible implementation manner of this embodiment, in step 51, in step 5, the process of drawing the equal extraction steam volume line is as follows:
and (4) calculating the maximum electric power and the minimum electric power which can be generated under the design working condition by utilizing an interpolation method, wherein the steam extraction quantity Qmin 'corresponding to the minimum actual operation electric power in the step (4), respectively making a vertical line, a maximum main steam flow limiting line and a middle exhaust temperature limiting line from the horizontal coordinates corresponding to the two powers upwards to form intersection points, and connecting the two intersection points to form the equal steam extraction quantity line corresponding to the steam extraction quantity Qmin'.
As a possible implementation manner of this embodiment, the specific process of step 52 is:
and (4) making an abscissa corresponding to the minimum actual operation electric power Pmin 'in the step (4) upwards as a vertical line, and making an intersection point with an extension line of the equal steam extraction amount line under the steam extraction amount Qmin', wherein the intersection point is the steam extraction working condition corresponding to the minimum actual operation electric power screened in the step (4).
As a possible implementation manner of this embodiment, the specific process of step 53 is:
and (4) translating the middle exhaust temperature limiting line of the design heat supply working condition diagram downwards until the middle exhaust temperature limiting line intersects with the intersection point in the step 52 to obtain the corrected middle exhaust temperature limiting line.
As a possible implementation manner of this embodiment, the specific process of step 54 is:
and translating the minimum exhaust steam flow limiting line in the design heat supply working condition diagram to the left until the minimum exhaust steam flow limiting line is intersected with the intersection point in the step 52 to obtain the corrected minimum exhaust steam flow limiting line.
As a possible implementation manner of this embodiment, the specific process of step 55 is:
all the equal steam extraction amount lines in the designed heat supply working condition diagram are taken as extension lines to intersect with the corrected middle exhaust temperature limiting line or the corrected minimum exhaust steam flow limiting line, and the maximum main steam flow limiting line, the corrected middle exhaust temperature limiting line, the corrected minimum exhaust steam flow limiting line and each typical equal steam extraction amount line form an operation interval under the corrected steam extraction working condition of the thermoelectric unit.
The technical scheme of the embodiment of the invention has the following beneficial effects:
the method for correcting the designed heat supply working condition diagram of the thermoelectric unit starts from the real historical operation data of the unit, selects the actual operation working condition which breaks through the designed heat supply working condition diagram operation interval, and corrects the original designed heat supply working condition diagram by using the working condition, thereby greatly widening the output interval of the unit in the heat supply state; the real operation data of the unit is utilized to correct the heat supply working condition diagram of the unit, on one hand, the output condition of the thermoelectric unit in the heat supply state can be more accurately reflected, reference is provided for operators, on the other hand, the operation interval of the unit is widened, the low load carrying capacity of the unit is improved, the unit can participate in more auxiliary services to obtain peak regulation compensation benefits, and meanwhile, new energy consumption is promoted.
Description of the drawings:
FIG. 1 is a flow diagram illustrating a method for modifying a thermoelectric generation set design heating profile in accordance with an exemplary embodiment;
FIG. 2 is a schematic diagram of a thermoelectric power plant design heating regime with 5 typical heating steam extractions;
FIG. 3 is a schematic diagram of a modified thermoelectric power unit design heating condition.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
in order to clearly explain the technical features of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings. The following disclosure provides many different embodiments, or examples, for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. It should be noted that the components illustrated in the figures are not necessarily drawn to scale. Descriptions of well-known components and processing techniques and procedures are omitted so as to not unnecessarily limit the invention.
FIG. 1 is a flow chart illustrating a method for modifying a design heating profile of a thermoelectric generation set according to an exemplary embodiment. As shown in fig. 1, a method for correcting a designed heat supply working condition diagram of a thermoelectric power unit according to an embodiment of the present invention includes the following steps:
step 1: designing a heat supply working condition diagram by utilizing the thermoelectric generating set, and acquiring the maximum power and the minimum power of the thermoelectric generating set under 5 groups of typical heat supply steam extraction quantities;
step 2: taking DCS historical data of steam extraction flow and electric power of a latest hot season of the thermoelectric unit, dividing the data into a plurality of time periods at an interval period of one hour, wherein each time period represents a steam extraction working condition, and calculating average steam extraction flow Q1 … Qn and actual running electric power P1 … Pn of a generator under each steam extraction working condition;
and 3, step 3: respectively judging which two typical heat supply steam extraction working conditions belong to the different steam extraction working conditions, and calculating the maximum theoretical electric power P1max … Pnmax and the minimum theoretical electric power P1min … Pnmin which the unit can generate at the heat supply steam extraction quantity by adopting a linear interpolation method;
and 4, step 4: comparing the actual operation electric power P1 … Pn in the step 2 with the minimum theoretical electric power P1min … Pnmin in the step 3, screening out an extraction working condition that the actual operation electric power is smaller than the minimum theoretical electric power, and screening out an extraction working condition of the minimum actual operation electric power;
and 5: and correcting the designed heat supply working condition diagram of the thermoelectric unit according to the minimum actual operation electric power and the corresponding steam extraction amount Pmin 'and Qmin' respectively.
The working condition that breaks through design heat supply working condition diagram is screened out from unit DCS historical operating data to this embodiment, revises the design working condition diagram on this basis, not only can revise thermoelectric generation set design heat supply working condition diagram, makes its actual behavior that more is close thermoelectric generation set moreover.
As a possible implementation manner of this embodiment, in step 1, as shown in fig. 2, the abscissa of the thermoelectric unit design heat supply operating condition diagram represents electric power, the ordinate represents main steam flow, the closed region surrounded by several lines in the middle of the operating condition diagram is the operation region of the unit under the heat supply operating condition, wherein the middle several oblique lines are equal extraction amount lines of typical extraction amount, the uppermost straight line is the maximum main steam flow limit line, the maximum electric power of the unit is limited, the lowermost straight line is the middle exhaust temperature limit line (minimum heat supply main steam flow limit line), the leftmost line is the minimum exhaust steam amount limit line, the two limit the minimum electric power of the unit, the abscissa value corresponding to the intersection point of the equal extraction amount line and the maximum main steam flow limit line is the maximum electric power that the unit can generate at the extraction amount, and the abscissa value corresponding to the intersection point of the equal extraction amount line and the middle exhaust temperature limit line or the minimum steam flow limit line of the low-pressure cylinder is the minimum electric power that the unit can generate at the extraction amount.
As a possible implementation manner of this embodiment, a calculation formula of the linear difference method is as follows:
in the formula:
q is the actual heat supply steam extraction amount of the unit, t/h; q i Designing a typical steam extraction quantity value of an ith group in a heat supply working condition diagram, t/h, for the unit; p is the corresponding maximum power or minimum power, t/h, of the unit under the actual heat supply steam extraction quantity; p i Designing the maximum power or the minimum power, MW corresponding to the ith group of typical steam extraction in a heat supply working condition diagram for the unit; i =1,2, … n.
As a possible implementation manner of this embodiment, the step 5 specifically includes the following steps:
step 51: drawing an equal extraction steam quantity line corresponding to the selected minimum actual operation electric power extraction steam quantity in a design heat supply working condition diagram;
step 52: making points corresponding to the steam extraction working conditions with the minimum actual electric power in the step 4 at the periphery of the designed heat supply working condition diagram operation interval;
step 53: making a corrected middle exhaust temperature limit line at the periphery of the operation interval of the designed heat supply working condition diagram;
step 54: making a corrected minimum exhaust steam flow limiting line of the low-pressure cylinder at the periphery of the operation interval of the designed heat supply working condition diagram;
step 55: and (4) making a corrected operation interval at the periphery of the operation interval of the designed heat supply working condition diagram, and finishing the correction of the designed heat supply working condition diagram of the unit.
As a possible implementation manner of this embodiment, in step 51, in step 5, the process of drawing the equal extraction steam volume line is as follows:
and (4) calculating the maximum electric power and the minimum electric power which can be generated under the design working condition by using an interpolation method, wherein the extraction steam quantity Qmin 'corresponding to the minimum actual operation electric power in the step (4), respectively making a vertical line, a maximum main steam flow limiting line and a middle exhaust temperature limiting line upwards from the abscissa corresponding to the two powers as intersection points, and connecting the two intersection points to form the equal extraction steam quantity line corresponding to the extraction steam quantity Qmin'.
As a possible implementation manner of this embodiment, the specific process of step 52 is:
and (4) making an abscissa corresponding to the minimum actual operation electric power Pmin 'in the step (4) upwards as a vertical line, and making an intersection point with an extension line of the equal steam extraction amount line under the steam extraction amount Qmin', wherein the intersection point is the steam extraction working condition corresponding to the minimum actual operation electric power screened in the step (4).
As a possible implementation manner of this embodiment, the specific process of step 53 is:
and (4) translating the middle exhaust temperature limiting line of the design heat supply working condition diagram downwards until the middle exhaust temperature limiting line intersects with the intersection point in the step 52 to obtain the corrected middle exhaust temperature limiting line.
As a possible implementation manner of this embodiment, the specific process of step 54 is:
and translating the minimum exhaust steam flow limiting line in the design heat supply working condition diagram to the left until the minimum exhaust steam flow limiting line is intersected with the intersection point in the step 52 to obtain the corrected minimum exhaust steam flow limiting line.
As a possible implementation manner of this embodiment, the specific process of step 55 is:
all the equal steam extraction amount lines in the design heat supply working condition diagram are taken as extension lines to intersect with the corrected middle exhaust temperature limiting line or the corrected minimum exhaust steam flow limiting line, the maximum main steam flow limiting line, the corrected middle exhaust temperature limiting line, the corrected minimum exhaust steam flow limiting line and each typical equal steam extraction amount line form an operation interval under the corrected steam extraction working condition of the thermoelectric unit, and the corrected design heat supply working condition diagram of the thermoelectric unit is shown in fig. 3.
The invention starts from the real historical operation data of the unit, selects the actual operation condition which breaks through the operation interval of the designed heat supply condition diagram, and corrects the original designed heat supply condition diagram by using the condition, thereby greatly widening the output interval of the unit in the heat supply state; the real operation data of the unit is utilized to correct the heat supply working condition diagram of the unit, on one hand, the output condition of the thermoelectric unit in the heat supply state can be more accurately reflected, reference is provided for operators, on the other hand, the operation interval of the unit is widened, the low load carrying capacity of the unit is improved, the unit can participate in more auxiliary services to obtain peak regulation compensation benefits, and meanwhile, new energy consumption is promoted.
The foregoing is only a preferred embodiment of the present invention, and it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and these modifications and improvements are also considered to be within the scope of the present invention.
Claims (5)
1. A correction method for a designed heat supply working condition diagram of a thermoelectric unit is characterized by comprising the following steps:
step 1: designing a heat supply working condition diagram by using a thermoelectric unit, and acquiring the maximum power and the minimum power of the thermoelectric unit under several groups of typical heat supply steam extraction quantities;
step 2: the method comprises the steps of calling DCS historical data of steam extraction flow and electric power of a thermoelectric unit in a latest heating season, dividing the data into a plurality of time periods at an interval period of one hour, wherein each time period represents a steam extraction working condition, and calculating average steam extraction flow Q1 … Qn and actual operation electric power P1 … Pn of a generator under each steam extraction working condition;
and step 3: respectively judging which two typical heat supply steam extraction working conditions belong to the different steam extraction working conditions, and calculating the maximum theoretical electric power P1max … Pnmax and the minimum theoretical electric power P1min … Pnmin which the unit can generate at the heat supply steam extraction quantity by adopting a linear interpolation method;
and 4, step 4: comparing the actual operation electric power P1 … Pn in the step 2 with the minimum theoretical electric power P1min … Pnmin in the step 3, screening out an extraction working condition that the actual operation electric power is smaller than the minimum theoretical electric power, and screening out an extraction working condition of the minimum actual operation electric power;
and 5: correcting a designed heat supply working condition diagram of the thermoelectric generating set according to the minimum actual operation electric power Pmin 'and the corresponding steam extraction quantity Qmin';
the step 5 specifically comprises the following steps:
step 51: drawing an equal extraction steam quantity line corresponding to the selected minimum actual operation electric power extraction steam quantity in a design heat supply working condition diagram;
step 52: making points corresponding to the steam extraction working conditions with the minimum actual electric power in the step 4 at the periphery of the designed heat supply working condition diagram operation interval;
step 53: making a corrected middle exhaust temperature limit line at the periphery of the operation interval of the designed heat supply working condition diagram;
step 54: making a corrected minimum exhaust steam flow limiting line of the low-pressure cylinder at the periphery of the operation interval of the designed heat supply working condition diagram;
step 55: the corrected operation interval is made at the periphery of the operation interval of the designed heat supply working condition diagram, and the correction of the designed heat supply working condition diagram of the unit is completed;
in step 51, the process of drawing the equal extraction steam volume line is as follows:
calculating the maximum electric power and the minimum electric power which can be generated under the design working condition by using an interpolation method for the steam extraction amount Qmin 'corresponding to the minimum actual operation electric power in the step 4, respectively making a vertical line, a maximum main steam flow limiting line and a middle exhaust temperature limiting line upwards from the horizontal coordinates corresponding to the two powers as intersection points, and connecting the two intersection points to form an equal steam extraction amount line corresponding to the steam extraction amount Qmin';
the specific process of step 52 is:
making an abscissa corresponding to the minimum actual operation electric power Pmin 'in the step 4 upwards as a vertical line, and making an intersection point with an extension line of the equal steam extraction amount line under the steam extraction amount Qmin', wherein the intersection point is the steam extraction working condition corresponding to the minimum actual operation electric power screened in the step 4;
the specific process of step 53 is as follows:
and (4) translating the middle exhaust temperature limiting line of the design heat supply working condition diagram downwards until the middle exhaust temperature limiting line intersects with the intersection point in the step 52 to obtain the corrected middle exhaust temperature limiting line.
2. The method as claimed in claim 1, wherein in step 1, the abscissa of the diagram represents the electric power, the ordinate represents the main steam flow, the closed region defined by several lines in the middle of the diagram is the operation region of the unit under the heating condition, the middle oblique lines are the equal extraction lines of the typical extraction steam volume, the uppermost straight line is the maximum main steam flow limit line, the highest electric power of the unit is limited, the lowermost straight line is the middle exhaust temperature limit line, the leftmost line is the minimum exhaust steam volume limit line, the two limit the lowest electric power of the unit, the abscissa value corresponding to the intersection point of the equal extraction steam volume line and the maximum main steam flow limit line is the maximum electric power that the unit can generate under the extraction steam volume, and the abscissa value corresponding to the intersection point of the equal extraction steam volume line and the middle exhaust steam temperature limit line or the minimum steam flow limit line of the low pressure cylinder is the minimum electric power that the unit can generate under the extraction steam volume.
3. The method for correcting the designed heating working condition diagram of the thermoelectric generating set as claimed in claim 1, wherein the calculation formula of the linear interpolation method is as follows:
in the formula:
4. the method for correcting the designed heating working condition diagram of the thermoelectric generating set according to claim 1, wherein the specific process of the step 54 is as follows:
and translating the minimum exhaust steam flow limiting line in the designed heat supply working condition diagram to the left until the minimum exhaust steam flow limiting line is intersected with the intersection point in the step 52 to obtain the corrected minimum exhaust steam flow limiting line.
5. The method for correcting the designed heating working condition diagram of the thermoelectric generating set according to claim 4, wherein the specific process of the step 55 is as follows:
all the equal steam extraction amount lines in the designed heat supply working condition diagram are taken as extension lines to intersect with the corrected middle exhaust temperature limiting line or the corrected minimum exhaust steam flow limiting line, and the maximum main steam flow limiting line, the corrected middle exhaust temperature limiting line, the corrected minimum exhaust steam flow limiting line and each typical equal steam extraction amount line form an operation interval under the corrected steam extraction working condition of the thermoelectric unit.
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