CN112818516A - Drainage optimization method for regenerative system of full-high-position steam turbine generator unit - Google Patents
Drainage optimization method for regenerative system of full-high-position steam turbine generator unit Download PDFInfo
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Abstract
A drainage optimization method for a heat recovery system of a full-high-position steam turbine generator unit comprises the following steps: s1, designing a plurality of feasible optimization schemes for counteracting the negative effects caused by the super-long pipeline and the vertical height difference according to the design characteristics of drainage of the full-high-position arrangement steam turbine generator unit heat recovery system; s2, analyzing the design data of the unit, S3, calculating and analyzing the economy and the safety reliability of the schemes proposed in S1, and S4, comparing the economy and the safety of each optimized scheme obtained from S3 to obtain an optimal solution. Aiming at the characteristics of a regenerative system of a full-high-position arranged steam turbine generator unit, the invention calculates the performance parameters of various solutions under different unit loads, analyzes the performance parameters, and comprehensively compares the various solutions by combining the factors of equipment investment, operation cost and safety and reliability to obtain the optimal hydrophobic scheme of the regenerative system so as to improve the safety and the economical efficiency of the unit.
Description
Technical Field
The application relates to the technical field of design optimization of a steam turbine, in particular to a drainage optimization method for a regenerative system of a full-high-position arrangement steam turbine generator unit.
Background
The turbine regenerative system is the most basic and most core part in the thermodynamic system of the thermal power plant, the regenerative heater is the main equipment used for improving the heat economy of the modern thermal power plant, and the operation performance of the regenerative heater directly influences the heat economy of the whole unit. According to the research result of high-efficiency clean brown coal-fired power generation initiated in 90 s of 20 th century and Germany, the actual thermal efficiency of the ultra-supercritical unit is improved by 7.7% compared with that of the ordinary subcritical 600MW unit at that time, wherein the benefit brought by the improvement of the thermal economy of a regenerative system accounts for about 1/7. Therefore, while paying attention to the capacity and parameters of the unit, the optimization of the turbine regenerative system should be paid attention to. And compared with the improvement of unit parameters, the thermodynamic system of the steam turbine is optimized, so that the method has the advantages of small investment, small technical risk, relatively easy realization and the like.
For a regenerative system of a generator set, two basic drainage modes are provided, namely a drainage step-by-step self-flow mode and a drainage pump mode are adopted;
the drainage mode of drainage step-by-step self-flow means that a regenerative system drains water by drainage step-by-step self-flow, drainage of a heater sequentially flows into a heater with lower pressure from a heater with high pressure by utilizing pressure difference between adjacent heaters, and drainage of a last-stage heater automatically flows into a deaerator or a condenser/condensation water tank of a steam turbine. The hydrophobic water of the upper stage heater enters the lower stage heater and releases heat energy.
The drainage mode by using a drainage pump means that a heat recovery system adopts the drainage pump to drain water, and most of the drainage pump is used for directly sending the drained water into a main condensation water pipeline at the outlet of the heater.
The heat economy is higher in this way than in the hydrophobic step-by-step gravity flow. The drain pump increases the plant power consumption, and makes the system complicated, thereby reducing the safety and reliability. The system has more water pumps, so that the system is complex, the investment is increased, more station power is consumed, the overhaul cost and the operation cost are increased, and the operation reliability is poorer.
Therefore, the surface heater generally adopts a drainage pump drainage mode not all, only adopts a drainage pump at the last stage or the next last stage of the low-pressure heater with larger drainage quantity, and adopts a drainage mode of step-by-step self-flow for the rest; the regenerative system of the modern large-capacity unit almost completely adopts a drainage step-by-step self-flow mode.
For a steam turbine generator unit arranged at a full high position, heaters, deaerators and condensation water tanks/condensers of all stages of a regenerative system are arranged in a vertical space with a great height difference, and due to the limitation of arrangement, the arrangement position of a heater at the previous stage is obviously lower than that of a heater at the next stage; the distance between the heaters is far, and the drain pipes between the heaters are often extremely long; due to the reasons, the hydrophobic flow of each stage of heater needs to overcome the influence caused by on-way resistance and height difference caused by an overlong pipeline; especially for the last few stages of low-pressure heaters, the influence of low steam extraction pressure and low drainage pressure is particularly obvious, and if a conventional drainage stage-by-stage gravity flow mode is adopted, the following problems can occur:
(1) affect the economy
Partial hydrophobic vaporization influences the through-flow capacity of the hydrophobic regulating valve, so that the hydrophobic is directly discharged into a condenser through the critical hydrophobic system due to the fact that the hydrophobic system is not smooth in flow, heat carried by the hydrophobic system is not fully utilized, cold source loss is increased, and economy is reduced.
(2) Affecting safety
For the last-stage and the next-stage low-pressure steam generators of the thermal power plant, as the steam extraction pressure is low, the drainage is positioned near the critical point of saturated water and saturated steam, and the influence of the change of the operation parameters on the flow state of the drainage is large. In the design process, if the pipeline trend changes greatly, the number of sharp turns is large, the selection of a hydrophobic junction point is unreasonable and the like due to the limitation of the position of a factory building, hydrophobic vaporization is easily caused, the vibration of a hydrophobic pipeline is caused, and finally, a welded junction of the pipeline is torn, the hydrophobic pipeline is damaged by fatigue, and the material fails. The final-stage low-pressure drainage pipeline is positioned in a negative pressure area, and if crater cracks are caused by vibration, the vacuum of a unit is easily deteriorated, dissolved oxygen is increased, and the oxidation corrosion of equipment and a system is aggravated. Moreover, the weld crater of the drain pipe can cause the vacuum of the unit to drop, and the unit is forced to stop running. The noise that hydrophobic pipeline vibration produced can produce the adverse effect to power plant's staff health. The drainage leakage caused by the vibration of the drainage pipeline can cause personnel scalding and personal injury accidents.
Disclosure of Invention
The embodiment of the application provides a drainage optimization method for a heat recovery system of a full-high-position arrangement steam turbine generator unit, wherein a drainage pipeline of a drainage abnormal heater is directly connected into a condenser/a condensation water tank and does not enter a next-stage low-pressure heater.
The embodiment of the application also provides a hydrophobic optimization method of a full high-order regenerative system of arranging the turbo generator set, a hydrophobic pump is added on a hydrophobic pipeline of the hydrophobic abnormal heater, and the method can be subdivided into two types according to the difference of hydrophobic confluence points: the B1 scheme is used for properly boosting the pressure of the drain water and merging the drain water into the drain water section of the next stage heater, and the B2 scheme is used for properly boosting the pressure of the drain water and guiding the drain water into the main condensation water pipeline at the outlet of the current stage heater.
The embodiment of the application also provides a drain optimization method of a full-high-position arrangement steam turbine generator unit's regenerative system, a branch pipe is added on the drain pipeline of the drain abnormal heater and is provided with a corresponding valve, when the high load working condition is met, the influence caused by the on-way resistance and the height difference can be overcome by the pressure difference with the next level drain, the drain flows into the drain section of the next level heater, when the low load working condition is met, the influence caused by the on-way resistance and the height difference can not be overcome by the pressure difference with the next level drain, and the drain directly flows into the condenser/condensate tank.
The embodiment of the application adopts the following technical scheme: a drainage optimization method for a regenerative system of a full-high-position arranged steam turbine generator unit aims to solve the problem of unsmooth drainage caused by the original design of the regenerative system of the full-high-position arranged steam turbine generator unit. Aiming at the characteristics of a regenerative system of a full-high-position arranged steam turbine generator unit, the invention calculates the performance parameters of various solutions under different unit loads, analyzes the performance parameters, and comprehensively compares the various solutions by combining the factors of equipment investment, operation cost and safety and reliability to obtain the optimal hydrophobic scheme of the regenerative system so as to improve the safety and the economical efficiency of the unit.
The embodiment of the application adopts at least one technical scheme which can achieve the following beneficial effects:
(1) good accuracy
Various influencing factors are considered in the calculation of the invention, including: the steam extraction amount of the heater is squeezed after the drain is converged into the system, and the influence on the generating capacity of the unit is avoided; the operating cost of the equipment is increased; the optimization schemes need to increase the cost of equipment and pipeline reconstruction;
the optimal solution is selected after the influence factors are comprehensively considered, so that the result is more accurate.
(2) The implementation method is simple
The invention does not need to rebuild the existing heater and steam extraction pipeline, does not change the arrangement of main equipment of the unit, only needs to add the drainage pump, the drainage pipeline and the related valves (according to the specific optimization scheme), has simple operation and adjustment method, does not relate to complex system, equipment and operation and adjustment method, and has simple implementation method.
The optimization calculation process of the invention is also clear, and some complex factors are reasonably simplified and can be executed by a computer.
(3) Economic performance of elevator unit
According to the invention, after comparison and analysis, the scheme with the best economy in alternative schemes is selected for implementation, so that the economy of the unit is obviously improved.
(4) Safety of hoisting machine set
By optimizing the drainage mode, the invention solves a series of problems of drainage vaporization caused by unsmooth drainage of a full-high-position steam turbine generator unit regenerative system, vibration of a drainage pipeline, fatigue damage of the pipeline, tearing of a welded junction, deterioration of unit vacuum, increase of dissolved oxygen, further aggravation of oxidation corrosion of equipment and the system, noise of the pipeline, drainage leakage and harm to personal safety and the like, and obviously improves the safety of the unit.
In a word, the optimal scheme is obtained through analysis and comparison, the problem that a backheating system of a full-high-position steam turbine generator unit is unsmooth in drainage is solved, the accuracy is good, the implementation method is simple, and the economy and the safety of the unit are obviously improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application.
FIG. 1 is a schematic diagram of a full-high-position arranged steam turbine generator unit regenerative system;
FIG. 2 is a system diagram of the baseline scheme and alternatives.
Reference numerals: 1. 1 # Gaojia; 2.2 # Gaogan; 3. number 3 gao jia; 4. number 4 high plus; 5. a deaerator; 6. no. 6 low addition; 7. no. 7 low addition; 8. no. 8 low addition; 9. low plus No. 9; 10. a hydrophobic flash tank; 11. a condensation water tank; 12. a turbo generator unit body; 13. low pressure cylinder exhaust pipe.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
For example, two 660MW ultra supercritical direct air cooling units are built, the full-high-position arrangement of the steam turbine generator unit body 12 is realized, and a high-pressure cylinder, a medium-pressure cylinder, a low-pressure cylinder and a low-pressure cylinder steam exhaust pipeline 13 of the steam turbine generator unit are connected with a generator through the same shaft system and are integrally arranged on a working platform with the height of 65 meters. Heaters of all stages of the heat recovery system, a deaerator 5, a condensation water tank 11 and a drainage flash tank 10 are arranged at different heights according to specific requirements, and the detailed condition is shown in attached figure 1.
As can be seen in the attached figure 1, the installation heights of No. 8 and No. 9 are about 58 meters, the installation heights of No. 6 and No. 7 are on the 35.3 meter layer, the deaerator 5 is on the 27 meter layer, and the condensation water tank 11 is on the 13.7 meter layer.
The main design data of the scheme is shown in the following table by taking the drainage step-by-step self-flow of a regenerative system as a reference scheme:
| name (R) | Unit of | Number 6 low plus | Number 7 | Number | 8 | Number | 9 low plus |
| Inlet pressure of steam | MPa | 0.561 | 0.352 | 0.112 | 0.044 | ||
| Enthalpy of admission | kJ/kg | 3049.8 | 2951.7 | 2735.4 | 2610.2 | ||
| Enthalpy of effluent | kJ/kg | 647.9 | 574.4 | 419.9 | 316.3 | ||
| Enthalpy of water inflow | kJ/kg | 574.4 | 419.9 | 316.3 | 200.1 | ||
| Enthalpy of drainage | kJ/kg | 597 | 442.1 | 338.2 | 223.3 | ||
| Flow rate of inlet steam | t/h | 42.09 | 83.41 | 55.042 | 59.44 |
Selecting data of rated working conditions of the unit for calculation and comparison; the specific implementation process is as follows:
step 1, designing a plurality of feasible optimization schemes;
according to the design characteristic of drainage of a regenerative system of a full-high-position arranged steam turbine generator unit, in order to offset the negative influence caused by the overlong pipeline and the vertical height difference, various feasible optimization schemes are designed, and the design scheme specifically comprises the following steps:
in the scheme A, a drainage pipeline of a drainage abnormal heater is directly connected to a condenser/condensation water tank 11 and does not enter a next-stage low-pressure heater, and the reference is shown in the attached figure 2;
scheme B, increase hydrophobic pump on hydrophobic abnormal heating ware's hydrophobic pipeline, according to the difference of hydrophobic confluence point, can subdivide into two kinds: the scheme B1 is to properly boost the pressure of the drained water and to be converged into the drainage section of the next-stage heater, and the scheme B2 is to properly boost the pressure of the drained water and to be led into a main condensation water pipeline at the outlet of the current-stage heater, which is shown in the attached figure 2;
a branch pipe is added on a drainage pipeline of the drainage abnormal heater and is provided with a corresponding valve, when the high-load working condition is adopted (the pressure difference between the drainage pipeline and the next stage can overcome the influence caused by the on-way resistance and the height difference), drainage flows into the drainage section of the next stage heater, and when the low-load working condition is adopted (the pressure difference between the drainage pipeline and the next stage can not overcome the influence caused by the on-way resistance and the height difference), drainage directly flows into a condenser/condensation water tank 11, and the reference is shown in the attached figure 2;
step 2, analyzing the design data of the unit, and searching and determining unreasonable drainage arrangement of the regenerative system;
whether the hydrophobic flow of the regenerative system of the full-high-position arranged generator set can overcome the influence caused by on-way resistance and height difference needs to pass through the following steps:
step 2.1, according to the design data of the unit, obtaining the drainage pressure of each level of heater of the unit under different load working conditions; the calculation formula is as follows:
ps＝pc-pts (1)
in the formula, psHeater hydrophobic pressure, kPa; p is a radical ofcObtaining the inlet steam pressure of the heater through design data of various working conditions of a steam turbine, namely kPa; p is a radical oftsTaking a performance guarantee value, kPa, in a heater design file for the steam side pressure loss of the heater;
taking the rated working condition of the unit as an example, the calculation result is shown in the following table:
| name (R) | Number 6 low plus | Number 7 | Number | 8 | Number | 9 low plus |
| Admission pressure (MPa) | 0.561 | 0.352 | 0.112 | 0.044 | ||
| Steam side pressure loss (MPa) | 0.005 | 0.005 | 0.005 | 0.005 | ||
| Hydrophobic pressure of heater (MPa) | 0.556 | 0.347 | 0.107 | 0.039 |
Step 2.2, calculating the total pressure loss of the drainage pipe sections of the heaters at all stages, wherein the calculation formula is as follows:
pzs＝pw+ph (2)
in the formula, pwIs the flow pressure loss of the drainage pipe section, kPa; p is a radical ofhThe pressure difference, kPa, caused by the difference of the heights of the drain openings of the heater of the current stage and the heater of the next stage;
flow pressure loss p of the drainage pipe section in the formula (2)wThe calculation formula is:
pw＝∑pf+∑pj (3)
in the formula, Σ pfThe sum of the on-way pressure losses of the pipe section, kPa; sigma pjkPa, the sum of local pressure losses; the factors such as pipe diameter, pipe length, elbow number, valve resistance and the like need to be considered in the calculation process, and the detailed calculation method is referred to DL/T5054 and 2016 steam-water pipeline design specification of thermal power plants;
the total pressure loss of the drainage pipe section of each heater is as follows: the number 6 heater hydrophobic section is 0.00219MPa, the number 7 heater hydrophobic section is 0.236MPa, and the number 8 heater hydrophobic section is 0.00226 MPa;
step 2.3, comparing the drainage pressure difference between each stage of heater with the total pressure loss of a drainage pipe section;
according to the data obtained by calculation in the step 2.1 and the step 2.2, the difference between the No. 6 low plus hydrophobic pressure and the No. 7 low plus hydrophobic pressure is 0.209MPa, and the total pressure loss of the hydrophobic pipeline is 0.00219 MPa; the difference between the No. 7 low plus hydrophobic pressure and the No. 8 low plus hydrophobic pressure is 0.240MPa, and the total pressure loss of the hydrophobic pipeline is 0.236 MPa; the difference between the No. 8 low plus hydrophobic pressure and the No. 9 low plus hydrophobic pressure is 0.068MPa, and the total pressure loss of the hydrophobic pipeline is 0.00226 MPa;
the difference of the drainage pressure from No. 6 low to No. 7 low and from No. 8 low to No. 9 low is higher than the total pressure loss of the drainage pipe section, so that drainage between the two stages of heaters can normally flow without optimization; the difference of the drainage pressure from No. 7 low to No. 8 low is almost equal to the total pressure loss of the drainage pipe section, drainage cannot flow normally, and optimization is needed;
step 2.4, comparing and analyzing in the step 2.3, and if the hydrophobic pressure difference from No. 7 low to No. 8 low under the rated working condition is lower than the total pressure loss of the hydrophobic pipe section, removing the alternative scheme C and selecting the optimized scheme from the rest schemes;
for convenient analysis, the drainage step-by-step self-flow mode of each heater under the typical arrangement condition of the unit is used as a reference scheme for economic calculation, and each scheme is compared with the reference scheme; the equivalent enthalpy drop principle commonly used in thermodynamic analysis is used in calculation;
step 3.1, carrying out economic analysis on the scheme A;
as can be seen from the attached figure 2, the proposal A is that the drain pipeline of the No. 7 heater is directly connected with the condensation water tank 11 and does not enter the No. 8 low-pressure heater; according to the principle of equivalent enthalpy drop, if the temperature of each stage of low-addition inlet/outlet water is kept unchanged, the number 8 and 9 low-addition steam inlet quantities need to be increased, and the calculation formula of the steam inlet quantity is as follows:
in the formula, DwIs the flow rate of the condensate and has the value of 1399.48 t/h; h isc8、hj8The water inlet enthalpy of No. 8 low addition-discharge water is 419.9 and 316.3 kJ/kg; h iss8、hs9Respectively 8 and 9 low hydrophobic enthalpy, the value is 338.2 and 223.3 kJ/kg; h isc9、hj9The enthalpy of water feeding and discharging is No. 9, the value is 316.3 and 200.1 kJ/kg; h is8、h9The enthalpy of the low steam admission of No. 8 and No. 9 is 2735.4 and 2610.2 kJ/kg;
has values of 60.460, 65.220 t/h;
8. the low steam adding amount of No. 9 increases, which can reduce the working steam in the steam turbine, and affect the generating capacity, the variation value of the online electric quantity is equal to it, the calculation formula is:
in the formula, hpcThe enthalpy of the exhaust steam of the main engine is 2410.0 kJ/kg; etaeFor generator efficiency, value 0.99;
the calculation result of (a) is-803.095 kW;
the proposal A does not increase equipment, but only changes the trend of the drain pipeline, so no additional purchase, installation and maintenance cost exists.
Step 3.2, carrying out economic analysis of the B1 scheme;
as can be seen from the attached figure 2, the scheme B1 is that a hydrophobic pump is added on the No. 7 low plus hydrophobic pipeline, and the hydrophobic is properly boosted and then converged into the No. 8 low plus hydrophobic section;
compared with the reference scheme, the hydrophobic enthalpy rise value caused by hydrophobic pressure rise is very small, and the influence can be ignored in calculation, so that various parameters (particularly the steam inlet quantity, the water inlet and outlet temperature and the hydrophobic temperature of each heater) of the regenerative system in the scheme B1 are the same as those in the reference scheme;
compared with the reference scheme, the B1 scheme adds a drain pump, the power consumption of the drain pump reduces the power of the available network, and the calculation formula is as follows:
in the formula (I), the compound is shown in the specification,
the low hydrophobic density of No. 7 after the B1 scheme is adopted, and the value is 954.520kg/m3；
The volume flow rate of No. 7 low-plus-hydrophobic liquid after the B1 scheme is adopted is 131.480m3/s；
The head of the hydrophobic pump is 20 m; etap、ηeEfficiency of the drain pump and efficiency of the motor are respectively;
the calculation result of (a) was-9.000 kW;
the proposal B1 adds a drainage pump and corresponding valves and pipelines, and the trend of the drainage pipeline needs to be changed in order to ensure enough backflow height to avoid cavitation; the purchase, installation and maintenance costs of the above devices also need to be considered.
Step 3.3, carrying out economic analysis of the B2 scheme;
as can be seen from the attached figure 2, the scheme B2 is that a drain pump is added on the No. 7 low pressure drainage pipeline, and the drainage is properly boosted and then converged into the No. 7 low pressure drainage outlet condensed water pipeline; according to the principle of equivalent enthalpy drop, firstly, the temperature of No. 6 low inlet water is changed by the imported hydrophobic water (the temperature of No. 7 low inlet water is unchanged), so that the amount of No. 6 low inlet steam is changed; secondly, the amount of condensed water flowing through No. 7, No. 8 and No. 9 low-pressure steam inlet is reduced, so that the steam inlet amount is changed;
6. low top-up No. 7 is sufficient for the following relationship:
in the formula, tau is hydrophobic enthalpy rise caused by pressure rise of a hydrophobic pump, kJ/kg; h isc7、hj7The enthalpy of water inlet and outlet is No. 7, and the values are 574.1 and 419.9 kJ/kg; h iss6、hs7Respectively No. 6 and No. 7 low hydrophobicity enthalpy, the values are 597.0 and 442.1 kJ/kg; h isc6The enthalpy of the low added water of No. 6 is 647.9 kJ/kg; h is6、h7The enthalpy of low steam addition of No. 6 and No. 7 is 3049.8 and 2951.7 kJ/kg;
the enthalpy of the water is No. 6 low, kJ/kg;
the steam adding amount is low for No. 6 and No. 7, t/h;
the joint type (8), (9) and (10) can be calculated
Value (c),
Value (c),
Values of 48.691, 75.362t/h, 562.562kJ/kg, respectively;
8. the calculation formula of No. 9 low steam addition amount is:
wherein the definitions and values of the parameters are the same as above;
6. the change of the number 7, 8 and 9 low steam-adding amount can change the working steam in the steam turbine and influence the generated energy, and the calculation formula is as follows:
the power consumption calculation formula of the B2 scheme hydrophobic pump is as follows:
in the formula, the head of the hydrophobic pump is matched for the B2 scheme,
a value of 150 m;
after the scheme B2 is adopted, the on-line electricity quantity changes, and the calculation formula is as follows:
the proposal B1 adds a drainage pump and corresponding valves and pipelines, and the trend of the drainage pipeline needs to be changed in order to ensure enough backflow height to avoid cavitation; the purchase, installation and maintenance costs of the above devices also need to be considered.
Step 4, comparing the economy and the safety of each optimization scheme obtained in the step 3 to obtain an optimal solution;
comparison in terms of economy:
net earnings of the computer set after different optimization schemes are adopted; by adopting the scheme A, the purchase, installation and maintenance of new equipment are not involved, and the net income is as follows:
by adopting the scheme of B1, the purchase, installation and maintenance of new equipment are involved, and the net benefits are as follows:
by adopting the scheme of B2, the purchase, installation and maintenance of new equipment are involved, and the net benefits are as follows:
in the above formula, Y is the number of operational years of the unit; h is the number of annual hours of use; epThe unit is charged with electricity;
and
after the schemes B1 and B2 are adopted, the purchase and installation costs of the newly added equipment are respectively calculated,
and
respectively adding the maintenance cost of the new equipment after adopting the schemes B1 and B2;
the values obtained above are substituted for expressions (16) to (18), respectively.
The specific values of (a) are influenced by various factors (performance, service life, fund source and the like), the specific values are difficult to determine, but the influence of the specific values on net income is far less than the change of the internet surfing electric quantity.
Therefore, from the economical aspect, the B2 solution is the best, and the a solution is the worst;
comparison in terms of safety:
(1) each scheme can solve a series of safety problems caused by unsmooth drainage due to the original design of a regenerative system of the full-high-position arrangement steam turbine generator unit;
(2) for the scheme A, the drainage pipeline is only properly prolonged, the flow direction is changed, potential fault sources are not increased, and the safety is highest;
(3) for the schemes B1 and B2, a drain pump, a matched recirculation pipeline, a valve and other equipment are required to be additionally arranged, so that potential fault sources are increased, and the operation adjustment is more complicated; the difference between the safety and the scheme A is not large under the conditions of strengthening equipment maintenance, ensuring various interlocking and reliable protection;
(4) for the scheme C, a drainage branch pipe and a matched drainage throttle are added, potential fault sources are increased, and the safety is lower than that of the scheme A but obviously higher than that of the schemes B1 and B2;
from the above, the B2 scheme is comparable in safety to the B1 scheme, and is slightly better than the B1 scheme in economical efficiency; the economical efficiency of the B2 scheme is obviously better than that of the A scheme (even if the drainage pump stops running due to failure, the drainage pipe is drained away, the economical efficiency is equal to that of the A scheme), and the safety is slightly worse than that of the A scheme;
considering the economy and the safety comprehensively, the scheme B2 is the optimal scheme of a full-high-position arrangement steam turbine generator unit for the third-stage construction in the Jinqian world;
the invention provides a drainage optimization method for a regenerative system of a full-high-position steam turbine generator unit, and aims to solve the problem of unsmooth drainage caused by the original design of the regenerative system of the full-high-position steam turbine generator unit. Aiming at the characteristics of a regenerative system of a full-high-position arranged steam turbine generator unit, the invention calculates the performance parameters of various solutions under different unit loads, analyzes the performance parameters, and comprehensively compares the various solutions by combining the factors of equipment investment, operation cost and safety and reliability to obtain the optimal hydrophobic scheme of the regenerative system so as to improve the safety and the economical efficiency of the unit.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. A drainage optimization method for a regenerative system of a full-high-position steam turbine generator unit is characterized by comprising the following steps: the method comprises the following steps:
s1, designing a plurality of feasible optimization schemes for counteracting the negative effects caused by the super-long pipeline and the vertical height difference according to the design characteristics of drainage of the full-high-position arrangement steam turbine generator unit heat recovery system;
s2, analyzing the design data of the unit, and searching and determining unreasonable drainage arrangement of the regenerative system;
s3, calculating and analyzing the economy, safety and reliability of the schemes proposed in S1, and providing a basis for evaluation;
and S4, comparing the economy and the safety of each optimization scheme obtained in the S3 to obtain an optimal solution.
2. The drainage optimization method of the heat recovery system of the full-high-position steam turbine generator unit according to claim 1 is characterized in that: the scheme provided by the S1: a, directly connecting a drain pipeline of the abnormal drain heater into a condenser/a condensation water tank, and not entering a next-stage low-pressure heater, A, a net gain calculation formula:
3. the drainage optimization method of the heat recovery system of the full-high-position steam turbine generator unit according to claim 1 is characterized in that: another scheme provided by the SI: b, a hydrophobic pump is added on a hydrophobic pipeline of the hydrophobic abnormal heater, and the hydrophobic abnormal heater can be subdivided into two types according to the difference of hydrophobic confluence points: the B1 scheme is used for properly boosting the pressure of the drained water and merging the drained water into the drainage section of the next-stage heater, the B2 scheme is used for properly boosting the pressure of the drained water and guiding the drained water into a main condensation water pipeline at the outlet of the current-stage heater, and the B1 net gain calculation formula is as follows:
b2 net profit calculation formula:
4. the drainage optimization method of the heat recovery system of the full-high-position steam turbine generator unit according to claim 1 is characterized in that: the S1 further provides a scheme: and C, adding a branch pipe on a drainage pipeline of the drainage abnormal heater and matching with a corresponding valve, wherein when the high-load working condition is adopted, the pressure difference between the drainage abnormal heater and the next drainage stage can overcome the influence caused by the on-way resistance and the height difference, the drainage flows into the drainage section of the next heater, when the low-load working condition is adopted, the pressure difference between the drainage abnormal heater and the next drainage stage can not overcome the influence caused by the on-way resistance and the height difference, and the drainage directly flows into a condenser/a condensate tank.
5. The drainage optimization method of the heat recovery system of the full-high-position steam turbine generator unit according to claim 1 is characterized in that: the specific operation mode of the S2 is as follows: 1, according to the design data of the unit, obtaining the drainage pressure of each level of heater of the unit under different load working conditions, wherein the calculation formula is as follows: p is a radical ofs＝pc-pts。
6. The drainage optimization method of the heat recovery system of the full-high-position steam turbine generator unit according to claim 5 is characterized in that: the specific operation mode of the S2 is as follows: 2, calculating the total pressure loss of the drain pipe sections of the heaters at all levels, wherein the total pressure loss comprises the on-way head loss and the local head loss of the drain pipe sections and the pressure difference caused by the difference of the heights of the drain openings of the heaters at the current level and the next level, and the calculation formula is as follows: p is a radical ofzs＝pw+ph、pw＝∑pf+∑pj。
7. The drainage optimization method of the heat recovery system of the full-high-position steam turbine generator unit according to claim 6, is characterized in that: the specific operation mode of the S2 is as follows: and 3, comparing the drainage pressure difference between the heaters of all stages with the total pressure loss of the drainage pipe section to determine the heater with drainage abnormality.
8. The drainage optimization method of the heat recovery system of the full-high-position steam turbine generator unit according to claim 7 is characterized in that: the specific operation mode of the S2 is as follows: 4, determining the rationality of the alternative proposed in the step S1 through the comparative analysis of the operation flows 2 and 3.
9. The drainage optimization method of the heat recovery system of the full-high-position steam turbine generator unit according to claim 1 is characterized in that: when the S3 calculates the A scheme, the calculation formula is as follows:
the calculation formula of the S3 in the calculation of the B1 scheme is as follows:
the calculation formula of the S3 in the calculation of the B2 scheme is as follows:
the S3 needs to consider the following factors when performing the economic analysis:
compared with a reference scheme, after various optimization schemes are implemented, due to the fact that positions of drain water of a drain water abnormal heater converging into a system are different, steam extraction quantities of a higher-level heater and a lower-level heater can be squeezed, work steam quantity in a turbine is increased or reduced, and power generation quantity is influenced;
2, the running power consumption of the drainage pump reduces the on-line electric quantity of the unit, and the factor needs to be considered when the drainage pump is designed into an optimization scheme;
3, the optimization schemes need to increase equipment and the cost of modifying pipelines needs to be considered.
10. The drainage optimization method of the heat recovery system of the full-high-position steam turbine generator unit according to claim 1 is characterized in that: after the optimal scheme is obtained in the S4, the problem that a regenerative system of the full-high-position steam turbine generator unit is unsmooth in drainage can be solved in a targeted manner in practical application.
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