CN113027546B - Low-pressure cylinder zero-output cooling effect evaluation method suitable for wet-cooling 300MW unit - Google Patents
Low-pressure cylinder zero-output cooling effect evaluation method suitable for wet-cooling 300MW unit Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
- F01D21/003—Arrangements for testing or measuring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/08—Cooling; Heating; Heat-insulation
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Abstract
The invention discloses a low-pressure cylinder zero-output cooling effect evaluation method suitable for a wet-cooling 300MW unit, which comprises the following steps of: 1) aiming at a wet-cooling 300MW unit, respectively obtaining the following components by a test method: and (3) a correction curve of the flow of the cooling steam, the temperature of the cooling steam, the backpressure of the unit and the desuperheating water flow of the low-pressure cylinder to the temperature of the penultimate stage and the final stage of the low-pressure cylinder. 2) Combining the correction curves to respectively obtain: and the corrected values of the cooling steam flow, the cooling steam temperature, the unit back pressure and the low-pressure cylinder desuperheating water flow on the secondary and final stages of the low-pressure cylinder. 3) Combining the correction values to obtain: and (4) integrating the correction value. 4) Obtaining the following comprehensive correction value according to the comprehensive correction value in the step 3): and (4) correcting the temperature of the penultimate stage and the final stage of the low-pressure cylinder. In the actual zero-output operation process, when the temperature, the pressure and the flow of the cooling steam and the backpressure of the unit deviate from the design values, the cooling effect of the cooling steam on the next-to-last-stage blade and the last-stage blade can be directly, qualitatively and quantitatively evaluated, and whether the cooling effect reaches the design values or not.
Description
Technical Field
The invention belongs to the technical field of operation of a steam turbine, and particularly relates to a low-pressure cylinder zero-output cooling effect evaluation method suitable for a wet-cooling 300MW unit.
Background
In recent years, the low-pressure cylinder zero-output technology can realize the flexible switching of a heat supply unit between steam extraction and condensation modes and low-pressure cylinder zero-output operation modes by greatly improving the heat supply capacity and the electric peak regulation capacity of the unit, and is widely applied to a wet cooling 300MW unit. In the zero-output operation process of the low-pressure cylinder, steam entering the low-pressure cylinder from the medium-pressure communicating pipe and the low-pressure communicating pipe is completely blocked, only a small amount of steam enters the low-pressure cylinder through the cooling steam pipeline in a steam cooling mode, and the steam and the desuperheating water of the low-pressure cylinder maintain the temperature of the penultimate stage and the final stage within a safe range.
However, in the actual operation process, the load and the ambient temperature of the unit cannot be always at the design values, the temperature, the pressure, the flow rate and the backpressure of the unit also have certain deviation from the design values, and the cooling effect of the cooling steam on the penultimate blade and the final blade cannot be directly and quantitatively evaluated, so that a new method needs to be provided for correcting the temperature of the penultimate blade and the final blade of the low-pressure cylinder so as to evaluate whether the cooling effect of the cooling steam reaches the design values or not.
Disclosure of Invention
The invention aims to solve the problems and provides a low-pressure cylinder zero-output cooling effect evaluation method suitable for a wet-cooling 300MW unit according to a low-pressure cylinder zero-output operation adaptability test method.
In order to achieve the above object, the present invention adopts the following technical means by
A low-pressure cylinder zero-output cooling effect evaluation method suitable for a wet-cooling 300MW unit comprises the following steps:
1) aiming at a wet-cooling 300MW unit, respectively obtaining the following results by a low-pressure cylinder zero-output operation adaptability test method: correction curves of cooling steam flow, cooling steam temperature, unit backpressure and low-pressure cylinder desuperheating water flow to the temperature of the penultimate stage and the final stage of the low-pressure cylinder are obtained;
2) based on the correction curve in the step 1), obtaining the following parameters according to the actual operation parameters of the low pressure cylinder with zero output force: the corrected values of the cooling steam flow, the cooling steam temperature, the unit back pressure and the low-pressure cylinder desuperheating water flow on the temperature of the penultimate stage and the final stage of the low-pressure cylinder;
3) obtaining the following correction value in the step 2): the comprehensive correction values of the cooling steam flow, the cooling steam temperature, the unit back pressure and the low-pressure cylinder desuperheating water flow on the temperature of the penultimate stage and the final stage of the low-pressure cylinder are as follows: c { theta [ theta ]) 1 }、C{θ 2 }；
4) Obtaining a comprehensive correction value of the temperature of the penultimate stage and the final stage of the low-pressure cylinder in the step 3): the corrected temperatures of the penultimate stage and the final stage of the low-pressure cylinder are as follows: theta' 1 、θ′ 2 ；
5) Obtaining the temperatures of the penultimate stage and the final stage of the low-pressure cylinder after the correction in the step 4): evaluation parameters of cooling effect of cooling steam on the penultimate and final stage blades: sub-last stage blade cooling effect deviation ratio delta 1 And the deviation ratio Delta of the cooling effect of the last-stage blade 2 And the method is used for quantitatively evaluating the cooling effect of the cooling steam on the penultimate and final-stage blades when the low-pressure cylinder of the wet-cooling 300MW unit runs with zero output.
The invention is further improved in that the correction value of the cooling steam flow to the penultimate temperature of the low-pressure cylinder is calculated from the actual operating value and the design value.
The invention is further improved in that the correction value of the cooling steam temperature to the penultimate temperature of the low-pressure cylinder is calculated from the actual operating value and the design value.
The invention is further improved in that the corrected value of the back pressure of the unit to the temperature of the penultimate stage of the low-pressure cylinder is calculated by an actual operation value and a design value.
The invention is further improved in that the corrected value of the low-pressure cylinder desuperheating water flow to the low-pressure cylinder penult-stage temperature is calculated by an actual operation value and a design value.
The invention is further improved in that the correction value of the cooling steam flow to the final stage temperature of the low-pressure cylinder is calculated from the actual operating value and the design value.
The invention is further improved in that the correction value of the cooling steam temperature to the final stage temperature of the low pressure cylinder is calculated from the actual operating value and the design value.
The invention is further improved in that the corrected value of the back pressure of the unit to the temperature of the penultimate stage of the low-pressure cylinder is calculated by an actual operation value and a design value.
The invention has the further improvement that the corrected temperature of the penultimate stage of the low pressure cylinder is obtained by calculating the comprehensive corrected value of the cooling steam flow, the cooling steam temperature, the unit back pressure, the low pressure cylinder desuperheating water flow to the temperature of the penultimate stage of the low pressure cylinder and the design value of the temperature of the penultimate stage of the low pressure cylinder;
the corrected final-stage temperature of the low-pressure cylinder is obtained by calculating a comprehensive correction value of the cooling steam flow, the cooling steam temperature, the unit back pressure, the low-pressure cylinder desuperheating water flow to the final-stage temperature of the low-pressure cylinder and a design value of the final-stage temperature of the low-pressure cylinder.
The invention is further improved in that the deviation rate of the cooling effect of the cooling steam on the penultimate blade is calculated by the corrected design values of the penultimate temperature of the low-pressure cylinder and the penultimate temperature of the low-pressure cylinder;
and calculating the deviation rate of the cooling effect of the cooling steam on the last-stage blade from the corrected low-pressure cylinder last-stage temperature and the low-pressure cylinder last-stage temperature design value.
The invention has at least the following beneficial technical effects:
in the actual zero-output operation process, when the temperature and flow of the cooling steam, the back pressure of the unit and the desuperheating water flow of the low-pressure cylinder have deviation from the design values, if the actual values of the temperature of the last stage and the last stage are directly compared with the design values, the cooling effect of the cooling steam on the last stage and the last stage blades cannot be reasonably evaluated.
Namely, the high cooling steam flow, the low cooling steam temperature, the low back pressure and the high-low pressure cylinder desuperheating water flow are beneficial to the temperature reduction of the penultimate stage and the final stage, so that the temperature of the penultimate stage and the final stage needs to be corrected according to the correction curves (obtained through a low-pressure cylinder zero-output operation adaptability test) of all the parameters, the influence of all the influencing factors on the temperature of the penultimate stage and the final stage is eliminated, and then the temperature is compared with a design value, so that the cooling effect of the cooling steam on the penultimate stage and the final stage blade is reasonably, scientifically and quantitatively evaluated whether the cooling effect reaches the design value.
Drawings
FIG. 1 is a logic diagram of the method steps of the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings and examples. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
Examples
As shown in fig. 1, for a wet-cooling 300MW unit, by a method of low-pressure cylinder zero-output operation adaptability test, the following results are obtained:
(1) correction curve of cooling steam flow to temperature of penultimate and final stages of low-pressure cylinder
θ 1 ＝f 1 (Q 1 )
θ 2 ＝f 2 (Q 1 )
(2) Correction curve of cooling steam temperature to temperature of penultimate and final stages of low-pressure cylinder
θ 1 ＝f 3 (T 1 )
θ 2 ＝f 4 (T 1 )
(3) Correction curve of backpressure to temperature of penultimate and final stages of low-pressure cylinder
θ 1 ＝f 5 (P 2 )
θ 2 ＝f 6 (P 2 )
(4) Correction curve of low-pressure cylinder temperature-reduction water flow to low-pressure cylinder penult-stage and last-stage temperatures
θ 1 ＝f 7 (Q 2 )
θ 2 ＝f 8 (Q 2 )
Step two:
based on the correction curve, according to the actual operation parameters of the low pressure cylinder with zero output, the following can be obtained:
(1) correction value of cooling steam flow to temperature of penultimate and final stages of low-pressure cylinder
C{θ 1 |Q 1 }＝f 1 (Q 10 )-f 1 (Q 1 )
C{θ 2 |Q 1 }＝f 2 (Q 10 )-f 2 (Q 1 )
(2) Correction value of cooling steam temperature to temperature of penultimate and final stages of low-pressure cylinder
C{θ 1 |T 1 }＝f 3 (T 1 )-f 3 (T 10 )
C{θ 2 |T 1 }＝f 4 (T 1 )-f 4 (T 10 )
(3) Correction value of back pressure to temperature of penultimate and final stages of low-pressure cylinder
C{θ 1 |P 2 }＝f 5 (P 2 )-f 5 (P 20 )
C{θ 2 |P 2 }＝f 6 (P 2 )-f 6 (P 20 )
(4) Correction value of low-pressure cylinder temperature-reduction water flow to low-pressure cylinder penult-stage and last-stage temperatures
C{θ 1 |Q 2 }＝f 7 (Q 20 )-f 8 (Q 2 )
C{θ 2 |Q 2 }＝f 8 (Q 20 )-f 8 (Q 2 )
Step three:
obtaining according to the step two: in the zero-output actual operation process of the low-pressure cylinder, the comprehensive correction values of the cooling steam flow, the cooling steam temperature, the unit back pressure and the low-pressure cylinder desuperheating water flow on the secondary and final stage temperatures of the low-pressure cylinder are respectively as follows:
C{θ 1 }＝C{θ 1 |Q 1 }+C{θ 1 |T 1 }+C{θ 1 |P 2 }+C{θ 1 |Q 2 }
C{θ 2 }＝C{θ 2 |Q 1 }+C{θ 2 |T 1 }+C{θ 2 |P 2 }+C{θ 2 |Q 2 }
step four:
the corrected temperatures of the penultimate stage and the final stage of the low-pressure cylinder are respectively as follows:
θ′ 1 ＝θ 1 +C{θ 1 }
θ′ 2 ＝θ 2 +C{θ 2 }
step five:
then, the following results were obtained: evaluation parameters of cooling effect of cooling steam on the penultimate and final stage blades: sub-last stage blade cooling effect deviation ratio (delta) 1 ) Final stage blade cooling effect deviation ratio (delta) 2 )：
Δ 1 When the absolute value is positive, the effect of the cooling steam on the next last stage blade is lower than the design value, and the larger the absolute value is, the worse the cooling effect is; when delta is 0, the cooling effect of the cooling steam on the last stage blade is consistent with the design value; when Δ is negative, the cooling effect of the cooling steam on the penultimate blade is better than the design value, and the larger the absolute value is, the better the cooling effect is.
Δ 2 When the number is positive, the cooling effect of the cooling steam on the last stage blade is lower than the design value, and the larger the absolute value is, the worse the cooling effect is; when delta is 0, the cooling effect of the cooling steam on the last stage blade is consistent with the design value; when Δ is negative, the cooling effect of the cooling steam on the last stage blade is better than the design value, and the larger the absolute value is, the better the cooling effect is.
Claims (1)
1. The low-pressure cylinder zero-output cooling effect evaluation method suitable for the wet-cooling 300MW unit is characterized by comprising the following steps of:
1) aiming at a wet-cooling 300MW unit, respectively obtaining the following results by a low-pressure cylinder zero-output operation adaptability test method: correction curves of cooling steam flow, cooling steam temperature, unit backpressure and low-pressure cylinder desuperheating water flow to the temperature of the penultimate stage and the final stage of the low-pressure cylinder are obtained;
2) based on the correction curve in the step 1), obtaining the following parameters according to the actual operation parameters of the low pressure cylinder with zero output force: the corrected values of the cooling steam flow, the cooling steam temperature, the unit back pressure and the low-pressure cylinder desuperheating water flow on the temperature of the penultimate stage and the final stage of the low-pressure cylinder;
the correction value of the cooling steam flow to the temperature of the penultimate stage of the low-pressure cylinder is obtained by calculating an actual operation value and a design value; the correction value of the cooling steam temperature to the penultimate temperature of the low-pressure cylinder is obtained by calculation from an actual operation value and a design value; the correction value of the backpressure of the unit to the temperature of the penultimate stage of the low-pressure cylinder is obtained by calculating an actual operation value and a design value; the correction value of the low-pressure cylinder desuperheating water flow to the low-pressure cylinder penultimate temperature is obtained by calculating an actual operation value and a design value; the correction value of the cooling steam flow to the final-stage temperature of the low-pressure cylinder is obtained by calculating an actual operation value and a design value; the correction value of the cooling steam temperature to the final-stage temperature of the low-pressure cylinder is obtained by calculation from an actual operation value and a design value; the correction value of the backpressure of the unit to the final-stage temperature of the low-pressure cylinder is obtained by calculating an actual operation value and a design value;
3) obtaining the following correction value in the step 2): the comprehensive correction values of the cooling steam flow, the cooling steam temperature, the unit back pressure and the low-pressure cylinder desuperheating water flow on the temperature of the penultimate stage and the final stage of the low-pressure cylinder are as follows: c { theta [ theta ]) 1 }、C{θ 2 }；
4) Obtaining a comprehensive correction value of the temperature of the penultimate stage and the final stage of the low-pressure cylinder in the step 3): the corrected temperatures of the penultimate stage and the final stage of the low-pressure cylinder are as follows: lambda' 1 、θ′ 2 ；
The corrected temperature of the penultimate stage of the low-pressure cylinder is obtained by calculating the comprehensive corrected value of the cooling steam flow, the cooling steam temperature, the unit back pressure, the low-pressure cylinder desuperheating water flow to the temperature of the penultimate stage of the low-pressure cylinder and the design value of the temperature of the penultimate stage of the low-pressure cylinder;
the corrected final-stage temperature of the low-pressure cylinder is obtained by calculating a comprehensive correction value of the cooling steam flow, the cooling steam temperature, the unit back pressure, the low-pressure cylinder desuperheating water flow to the final-stage temperature of the low-pressure cylinder and a design value of the final-stage temperature of the low-pressure cylinder;
5) obtaining the temperatures of the penultimate stage and the final stage of the low-pressure cylinder after the correction in the step 4): evaluation parameters of cooling effect of cooling steam on the penultimate and final stage blades: sub-last stage blade cooling effect deviation ratio delta 1 And the deviation ratio Delta of the cooling effect of the last-stage blade 2 The method is used for quantitatively evaluating the cooling effect of the cooling steam on the penultimate and final-stage blades when the low-pressure cylinder of the wet-cooling 300MW unit runs with zero output;
calculating the deviation rate of the cooling effect of the cooling steam on the penultimate blade according to the corrected penultimate temperature of the low-pressure cylinder and the final penultimate temperature design value of the low-pressure cylinder;
and calculating the deviation rate of the cooling effect of the cooling steam on the last-stage blade from the corrected low-pressure cylinder last-stage temperature and the low-pressure cylinder last-stage temperature design value.
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