CN219714769U - Performance monitoring and energy consumption metering system for exhaust steam waste heat utilization system of steam turbine - Google Patents
Performance monitoring and energy consumption metering system for exhaust steam waste heat utilization system of steam turbine Download PDFInfo
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Abstract
The utility model relates to a performance monitoring and energy consumption metering system of a waste steam waste heat utilization system of a steam turbine, in particular to the field of heat supply and energy saving modification of a thermal power plant unit, which is additionally arranged in the waste steam waste heat utilization system of the steam power plant and comprises a heat supply network circulating water flowmeter arranged in a heat supply network, a medium-pressure cylinder steam extraction to steam turbine flowmeter arranged on a power steam inlet pipeline of the steam turbine, a steam turbine steam extraction thermometer and a steam turbine steam extraction pressure meter arranged on a steam turbine steam extraction pipeline, a steam turbine condenser water outlet thermometer arranged on a steam turbine condenser water outlet pipeline, a steam turbine condenser water outlet thermometer arranged on a steam turbine condenser water outlet pipeline, and a high back pressure condenser water outlet thermometer arranged on a high back pressure condenser water outlet pipeline. The utility model can fully exert the design performance of the steam turbine, so that the waste steam waste heat utilization system of the steam turbine can be maintained to run nearby the high-efficiency point, and the waste steam waste heat utilization efficiency is improved.
Description
Technical Field
The utility model relates to the field of heat supply and energy saving transformation of units of a thermal power plant, in particular to a performance monitoring and energy consumption metering system of a waste steam and waste heat utilization system of a steam turbine.
Background
At present, with the improvement of energy conservation and emission reduction consciousness, more and more thermal power generation enterprises carry out cogeneration transformation, and the exhaust steam waste heat utilization technology is one of the mainstream technologies adopted by the cogeneration transformation. The exhaust steam waste heat utilization technology of the steam adding machine (steam injector) is increasingly adopted due to the advantages of high exhaust steam utilization rate, good economy and the like.
The system for utilizing the waste heat of the steam turbine by utilizing the waste heat utilization technology is mainly based on a steam turbine set and an air cooling island in a steam-water system of a thermal power plant, and specifically comprises the following steps:
referring to fig. 1, the steam turbine unit 1 includes a high pressure cylinder 11, a middle pressure cylinder 12 and a low pressure cylinder 13 which are sequentially communicated, a main steam 111 of a steam turbine is introduced into the high pressure cylinder 11, reheat steam 121 of the steam turbine is introduced into the middle pressure cylinder 12, a heat supply butterfly valve 122 of a medium-low pressure communicating pipe of the steam turbine is installed on a communicating pipe between the middle pressure cylinder 12 and the low pressure cylinder 13, the low pressure cylinder 13 is connected to a generator 2, a steam exhaust pipe of the low pressure cylinder 13 is simultaneously connected to an air cooling island 3, a low pressure cylinder steam exhaust to air cooling island isolation valve 31 is installed on a pipeline from which the low pressure cylinder 13 exhausts steam to the air cooling island 3, and condensate 32 of the air cooling island is exhausted to a hot well through the pipeline.
The exhaust steam waste heat utilization part in the exhaust steam turbine exhaust heat utilization system comprises a heat supply network circulating pipe network 4, a high back pressure condenser 41, a steam turbine 421, a steam turbine condenser 42, a heat supply network circulating water pump 43 and a heat supply network heater 44, wherein the high back pressure condenser 41, the steam turbine condenser 42, the heat supply network circulating water pump 43 and the heat supply network heater 44 are sequentially connected into the heat supply network circulating pipe network 4 along the hot water flow direction, and the steam turbine 421 is connected with the steam turbine condenser 42, specifically: the exhaust steam outlet of the steam adding machine 421 is communicated with the steam adding machine condenser 42, the exhaust steam inlet is communicated with a steam exhaust pipeline of the low pressure cylinder 13, and the power steam inlet is communicated with a steam exhaust pipeline of the medium pressure cylinder 12; in addition, the exhaust steam inlet of the high back pressure condenser 41 is also communicated with the exhaust steam pipeline of the low pressure cylinder 13, and the steam inlet of the heat supply network heater 44 is communicated with the exhaust steam pipeline of the medium pressure cylinder 12.
The exhaust steam waste heat utilization system of the steam turbine comprises the main equipment and also comprises a pipeline installed on the corresponding pipeline: the low pressure cylinder discharges steam to exhaust steam waste heat utilization part isolation valve 411, the low pressure cylinder discharges steam to high back pressure condenser valve 412, the low pressure cylinder discharges steam to steam booster valve 422, the medium pressure cylinder discharges steam to steam booster valve 423 and the medium pressure cylinder discharges steam to heat supply network heater valve 441.
In the operation of the exhaust steam waste heat utilization system of the steam turbine, various performance parameters such as temperature, pressure, flow and the like exist, the performance parameters are used as variables to determine whether the system operates at a high-efficiency point, whether the performance of the steam turbine reaches a design value or not is directly related to the exhaust steam waste heat utilization efficiency of the system, and therefore, the system capable of monitoring the performance of the exhaust steam waste heat utilization system of the steam turbine and even measuring the energy consumption of the system is needed to be provided.
Disclosure of Invention
In order to fully exert the design performance of the steam turbine, ensure that a steam turbine exhaust steam waste heat utilization system can be maintained to run nearby a high-efficiency point, and improve the exhaust steam waste heat utilization efficiency, the utility model provides a performance monitoring and energy consumption metering system of the steam turbine exhaust steam waste heat utilization system.
The utility model provides a performance monitoring and energy consumption metering system of a waste steam waste heat utilization system of a steam turbine, which adopts the following technical scheme:
the system comprises a heat supply network circulating water flowmeter arranged in a heat supply network circulating pipe network, a medium-pressure cylinder steam exhaust-to-steam turbine flow meter arranged on a power steam inlet pipeline of the steam turbine, a steam turbine exhaust-steam thermometer and a steam turbine exhaust-steam pressure meter arranged on a steam turbine exhaust-steam pipeline, a steam turbine condenser outlet-water thermometer arranged on a steam turbine condenser outlet pipeline, a steam turbine condenser condensation-water thermometer arranged on a steam turbine condenser condensation-water outlet pipeline, and a high back pressure condenser outlet-water thermometer arranged on a high back pressure condenser outlet pipeline.
By adopting the technical scheme, the injection ratio of the steam-increasing machine can be calculated by using the measured parameters, and the injection ratio is a key performance parameter of the core equipment steam-increasing machine in the waste steam waste heat utilization system of the steam-increasing machine, the injection ratio can change along with the change of other parameter values in the system, the deviation between the injection ratio and the design value of the system can reflect the deviation between the actual operation working condition and the design working condition, and the greater the deviation, the more the system is operated and the more the deviation is deviated from the high-efficiency point of the system, so the performance monitoring of the waste steam waste heat utilization system of the steam-increasing machine can be realized by measuring the key parameters.
Optionally, the device further comprises a low-pressure cylinder exhaust pressure gauge arranged on the low-pressure cylinder exhaust pipeline.
By adopting the technical scheme, the measured low-pressure cylinder exhaust steam pressure and the measured high-pressure steam turbine exhaust steam pressure can be used for calculating the high-pressure ratio of the high-pressure steam turbine, and as the high-pressure ratio is also a key performance parameter of the core equipment high-pressure steam turbine in the high-pressure steam turbine exhaust steam waste heat utilization system, the high-pressure ratio can also change along with the change of other parameters in the system, the deviation between the high-pressure ratio and the design value of the system can also reflect the deviation between the actual operation condition and the design condition, and the greater the deviation is, the more the system is deviated from the high-efficiency point of the system, so that the further monitoring of the performance of the high-pressure steam turbine exhaust steam waste heat utilization system can be realized through the measurement of the key parameters.
Optionally, the device also comprises a low-pressure cylinder steam exhaust thermometer arranged on the low-pressure cylinder steam exhaust pipeline and a high-backpressure condenser condensate water thermometer arranged on the high-backpressure condenser condensate water outlet pipeline.
By adopting the technical scheme, the exhaust steam utilization amount of the exhaust steam waste heat utilization system can be further calculated, and the exhaust steam utilization amount of the exhaust steam waste heat utilization system is also one of key performance data of the exhaust steam waste heat utilization system of the steam adding machine, and the higher the initiating utilization amount of the exhaust steam waste heat utilization system is, the better the performance of the exhaust steam waste heat utilization system is shown.
Optionally, the device also comprises an air cooling island condensed water flowmeter arranged on the air cooling island condensed water outlet pipeline.
By adopting the technical scheme, the exhaust steam quantity of the low-pressure cylinder can be calculated, and then the exhaust steam utilization rate is calculated, the exhaust steam utilization rate is maintained at a high point, and the performance of the exhaust steam waste heat utilization system is more excellent.
Optionally, the device further comprises an air cooling island condensation water channel U-shaped bend additionally arranged on the air cooling island condensation water outlet pipeline, and the air cooling island condensation water channel U-shaped bend is arranged at the water outlet end of the air cooling island condensation water flowmeter.
By adopting the technical scheme, the U-shaped bend of the condensation waterway of the air cooling island is additionally arranged, so that the full pipe of the pipeline where the condensation water flowmeter of the air cooling island is positioned can be ensured, and the accurate measurement result is ensured.
Optionally, the device further comprises a medium pressure cylinder steam extraction pressure gauge and a medium pressure cylinder steam extraction temperature gauge which are arranged on a medium pressure cylinder steam extraction pipeline, a medium pressure cylinder steam extraction to heat supply network heater flowmeter which is arranged on a heat supply network heater steam inlet pipeline, and a heat supply network heater drainage temperature gauge which is arranged on a heat supply network heater drainage pipeline.
By adopting the technical scheme, the medium-pressure cylinder steam extraction heat supply coal consumption, the medium-pressure cylinder steam extraction heat supply quantity, the high-back-pressure exhaust steam heat supply coal consumption and the high-back-pressure exhaust steam heat supply quantity can be calculated, so that the whole heat supply coal consumption of the exhaust steam waste heat utilization system of the steam increasing machine is calculated, the system heat supply economy is intuitively analyzed, and the energy consumption metering of the exhaust steam waste heat utilization system of the steam increasing machine is realized.
Optionally, the system also comprises a heat supply network heater water outlet thermometer additionally arranged in the heat supply network circulation pipe network.
Through adopting above-mentioned technical scheme, can judge directly perceivedly whether the heat supply network heater goes out water temperature and reaches standard and its concrete temperature, the condition is robbed to the exhaust steam waste heat utilization system performance of the more audio-visual judgement of being convenient for, convenient quick adjustment.
Optionally, the system is accessed into a DCS (distributed control system) of a power plant unit.
By adopting the technical scheme, the DCS system is used for controlling and adjusting all main parameters in the exhaust heat utilization system of the steam turbine in real time, and the exhaust heat utilization system of the steam turbine is kept to operate efficiently.
In summary, the present utility model includes at least one of the following beneficial technical effects:
1. the injection ratio of the steam turbine is conveniently calculated in real time, whether the waste steam waste heat utilization system of the steam turbine runs at a high-efficiency point is judged according to the deviation from the design value, and the performance monitoring of the waste steam waste heat utilization system of the steam turbine is realized;
2. the pressure-increasing ratio of the steam-increasing machine can be calculated by using the measured steam-discharging pressure of the low-pressure cylinder and the steam-increasing machine, and the operation condition of the waste steam waste heat utilization system of the steam-increasing machine can be judged more accurately by combining the calculated injection ratio of the steam-increasing machine, so that performance monitoring can be carried out more objectively and reasonably;
3. the method can calculate and obtain the medium-pressure cylinder exhaust steam extraction heat supply coal consumption, the medium-pressure cylinder exhaust steam extraction heat supply quantity, the high-back pressure exhaust steam heat supply coal consumption and the high-back pressure exhaust steam heat supply quantity, further calculate the whole heat supply coal consumption of the exhaust steam waste heat utilization system of the steam adding machine, realize the energy consumption metering of the exhaust steam waste heat utilization system of the steam adding machine, and intuitively analyze the heat supply economical efficiency of the system.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a waste steam waste heat utilization system of a steam turbine in the related art;
FIG. 2 is a schematic diagram of the overall structure of the system for monitoring the performance of the exhaust steam waste heat utilization system of the steam turbine and measuring the energy consumption under the application condition of the system in the embodiment of the utility model;
FIG. 3 is a schematic view of the overall structure of the extraction steam of the intermediate pressure cylinders of the other turbine units introduced into the system shown in FIG. 2.
Reference numerals illustrate: 1. a turbine unit; 11. a high-pressure cylinder; 111. a steam turbine main steam; 12. a medium pressure cylinder; 121. reheat steam of the steam turbine; 122. a medium-low pressure communicating pipe heat supply butterfly valve of the steam turbine; 13. a low pressure cylinder; 2. a generator; 3. air cooling island; 31. exhausting the steam from the low-pressure cylinder to an air cooling island isolation valve; 32. air cooling island condensation water;
4. a heat supply network circulating pipe network; 41. a high back pressure condenser; 411. the low-pressure cylinder discharges steam to a waste heat utilization part isolation valve of exhaust steam; 412. the low-pressure cylinder discharges steam to a high-back pressure condenser valve; 413. a low pressure cylinder exhaust pressure gauge; 414. a low pressure cylinder exhaust thermometer; 415. a heat supply network circulating water backwater thermometer; 416. a high back pressure condenser water outlet thermometer; 417. condensing water of the high back pressure condenser; 418. a high back pressure condenser condensation water thermometer; 42. a condenser of the steam turbine; 421. a steam adding machine; 422. exhausting the steam from the low-pressure cylinder to a valve of the steam adding machine; 423. exhausting and extracting steam from the medium pressure cylinder to a valve of a steam adding machine; 424. a condenser outlet thermometer of the steam turbine; 425. a steam exhaust thermometer of the steam adding machine; 426. a steam exhaust pressure gauge of the steam adding machine; 427. condensing water of a condenser of the steam turbine; 428. condensing water thermometer of condenser of the booster; 43. a heat supply network circulating water pump; 44. a heating network heater; 441. exhausting steam to a valve of a heating network heater by the medium pressure cylinder; 442. in addition, the medium-pressure cylinder discharges steam and is extracted to a dead steam waste heat utilization system stop valve; 443. a water outlet thermometer of the heating network heater; 444. a medium pressure cylinder exhaust steam extraction pressure gauge; 445. a medium pressure cylinder exhaust steam extraction thermometer; 446. draining water by a heat supply network heater; 447. a heat supply network heater drain thermometer;
51. air cooling island condensed water flowmeter; 511. u-shaped bend of condensation waterway of air cooling island; 52. a heat supply network circulating water flowmeter; 53. exhausting and extracting steam from the medium pressure cylinder to a steam turbine flow meter; 54. the medium pressure cylinder discharges steam to the flowmeter of the heater of the heat supply network.
Detailed Description
The utility model is described in further detail below with reference to fig. 2-3.
The embodiment of the utility model discloses a performance monitoring and energy consumption metering system of a waste steam waste heat utilization system of a steam turbine, and the embodiment is exemplified by being applied to the waste steam waste heat utilization system of the steam turbine shown in fig. 1. Referring to fig. 1, the performance monitoring and energy consumption metering system of the exhaust steam waste heat utilization system of the steam turbine comprises a plurality of parameter measuring devices additionally arranged in the exhaust steam waste heat utilization system of the steam turbine, all the parameter measuring devices are connected into a DCS system of a power plant unit, and the parameter measuring devices specifically comprise:
a low pressure cylinder exhaust pressure gauge 413 and a low pressure cylinder exhaust temperature gauge 414 which are additionally arranged on the exhaust main pipeline of the low pressure cylinder 13, a heat supply network circulating water backwater temperature gauge 415 which is additionally arranged on the water inlet pipeline of the high back pressure condenser 41, a high back pressure condenser water outlet temperature gauge 416 which is additionally arranged on the water outlet pipeline of the high back pressure condenser 41, and a high back pressure condenser condensed water temperature gauge 418 which is additionally arranged on the water outlet pipeline of the high back pressure condenser condensed water 417;
a steam turbine exhaust thermometer 425 and a steam turbine exhaust manometer 426 which are additionally arranged on a steam turbine 421 exhaust pipeline, a steam turbine condenser outlet thermometer 424 which is additionally arranged on a steam turbine 42 outlet pipeline, and a steam turbine condenser condensation water thermometer 428 which is additionally arranged on a steam turbine condenser condensation water 427 outlet pipeline;
also included are a heat supply network heater outlet thermometer 443 incorporated into heat supply network circulation pipe network 4, a medium pressure cylinder exhaust gas extraction pressure gauge 444 and a medium pressure cylinder exhaust gas extraction thermometer 445 incorporated into the medium pressure cylinder 12 exhaust gas extraction pipeline, and a heat supply network heater drain thermometer 447 incorporated into the heat supply network heater drain 446 pipeline.
The system also comprises an air cooling island condensed water flowmeter 51 which is additionally arranged on an outlet pipeline of the air cooling island condensed water 32, a heat supply network circulating water flowmeter 52 which is additionally arranged in the heat supply network circulating pipe network 4, a medium-pressure cylinder exhaust steam extraction to steam booster flowmeter 53 which is additionally arranged on a power steam inlet pipeline of the steam booster 421 and a medium-pressure cylinder exhaust steam extraction to heat supply network heater flowmeter 54 which is additionally arranged on a steam inlet pipeline of the heat supply network heater 44.
In addition, an air cooling island condensation water path U-shaped bend 511 is additionally arranged on a pipeline at the water outlet end of the air cooling island condensation water flow meter 51, and the bending part of the air cooling island condensation water path U-shaped bend 511 faces upwards, so that the pipeline where the air cooling island condensation water flow meter 51 is located can be in a full pipe state, and accurate measurement results are ensured.
The real-time parameters measured by the parameter measuring device can be used for calculating the following performance key parameters of the exhaust steam waste heat utilization system of the steam turbine: the injection ratio of the steam increasing machine, the boosting ratio of the steam increasing machine, the exhaust steam utilization amount of the exhaust steam waste heat utilization system, the exhaust steam amount of the low-pressure cylinder, the exhaust steam utilization rate of the low-pressure cylinder, the exhaust steam heat supply coal consumption of the medium-pressure cylinder and the high-back pressure exhaust steam heat supply coal consumption. The specific calculation method is as follows: injection ratio eta of the steam turbine:
wherein: q (Q) d The power steam quantity used for the steam booster is measured by a flowmeter 53 for exhausting steam to the steam booster for the additionally arranged medium-pressure cylinder; q (Q) f In order to increase the amount of exhaust steam emitted by the steam turbine,
Q f ＝Q zp -Q d
wherein: q (Q) zp In order to increase the exhaust steam quantity of the steam turbine,
wherein: q (Q) rx The flow rate of the circulating water of the heat supply network is measured by a heat supply network circulating water flow meter 52; c is the specific heat capacity of water; t (T) zc To increase the vaporThe outlet water temperature of the condenser is measured by a water outlet thermometer 424 of the condenser of the booster turbine, T zr The water inlet temperature of the condenser of the turbine is equal to the water outlet temperature of the high-back pressure condenser, and is measured by a water outlet thermometer 416 of the high-back pressure condenser. h is a z To increase the exhaust enthalpy value of the steam turbine, h z ＝h_pt(p zp ,t zp )，p zp For the exhaust pressure of the steam turbine, t is measured by a steam turbine exhaust pressure gauge 426 zp For the exhaust temperature of the steam turbine, the exhaust temperature of the steam turbine is measured by a steam turbine exhaust thermometer 425, h zs For increasing the enthalpy value of condensation water of a condenser of the steam turbine, h zs ＝t zs X c, wherein t zs For the condenser condensate thermometer 428, c is the specific heat capacity of water.
Boost ratio α of the booster:
wherein: p is p zp For the exhaust pressure of the steam turbine, p is measured by a steam turbine exhaust pressure gauge 426 dp The low-pressure cylinder exhaust pressure is measured by a low-pressure cylinder exhaust pressure gauge 413.
Waste steam utilization amount Q of waste steam waste heat utilization system l
Q l ＝Q f +Q g
Wherein: q (Q) f The exhaust steam quantity for the steam turbine is obtained according to a calculation formula provided by a steam turbine injection ratio part, Q g For the utilization amount of the exhaust steam of the high back pressure condenser,
in which Q rx The flow rate of the circulating water of the heat supply network is measured by a heat supply network circulating water flow meter 52; t (T) gc The outlet water temperature of the high back pressure condenser is measured by a high back pressure condenser outlet water thermometer 416, T gr The water inlet temperature of the high back pressure condenser is measured by a heat supply network circulating water backwater thermometer 415, h b Is the exhaust enthalpy value of the low-pressure cylinder, h b ＝h_pt(p bp ,t bp )，p bp The exhaust pressure of the low-pressure cylinder is measured by a low-pressure cylinder exhaust pressure gauge 413, t bp The exhaust temperature of the low-pressure cylinder is measured by a low-pressure cylinder exhaust thermometer 414; h is a gs Is the enthalpy value of condensation water of the high back pressure condenser, h gs ＝t gs ×c，t gs And c is the specific heat capacity of water measured by the high back pressure condenser condensation water thermometer 418.
Low pressure cylinder exhaust Q dp
Q dp ＝Q l +Q sd
Wherein: q (Q) l The exhaust steam utilization amount of the exhaust steam waste heat utilization system is calculated according to the formula; q (Q) sd The amount of exhaust steam cooled by the air cooling island is measured by the condensation water flowmeter 51 of the air cooling island.
Exhaust steam utilization rate gamma
Wherein: q (Q) l The waste steam utilization amount Q of a waste steam waste heat utilization system dp Is the exhaust steam quantity of the low-pressure cylinder.
Medium-pressure cylinder steam extraction and heat supply coal consumption b zc
Wherein: h is a zc Is the vapor extraction enthalpy value of the medium-pressure cylinder, h zc ＝h_pt(p zc ,t zc )，p zc The extraction pressure of the medium pressure cylinder is measured by an extraction pressure meter 444 of the medium pressure cylinder, t zc B is the exhaust steam extraction temperature of the medium pressure cylinder, which is measured by the exhaust steam extraction temperature meter 445 of the medium pressure cylinder fd The coal consumption value for pure condensation power supply of the steam turbine generator unit is a power plant statistical value, h zcs The heat supply network heater drainage enthalpy value is measured by a heat supply network heater drainage thermometer 447.
High back pressure exhaust steam heat supply coal consumption b gb
Wherein: h is a c The enthalpy value of exhaust gas under the back pressure of normal exhaust gas of the turbine unit is a turbine unit design value, and can be detected; h is a gs Is the enthalpy value of condensation water of the high back pressure condenser, h gs ＝t gs X c, wherein t gs C is the specific heat capacity of water measured by a high back pressure condenser condensation water thermometer 418; gamma is the utilization rate of exhaust steam.
The method for guiding the efficient operation of the exhaust steam waste heat utilization system of the steam turbine comprises the following steps:
through monitoring and calculating the key parameters of the exhaust steam waste heat utilization system performance, the following data can be obtained:
exhaust steam waste heat utilization system medium-pressure cylinder steam extraction heat supply q zc
q zc ＝(Q d +Q rj )×(h zc -h zcs )
Wherein: q (Q) d The power steam quantity used for the booster is measured by a flowmeter 53 for exhausting and extracting steam from the medium-pressure cylinder to the booster; q (Q) rj The steam extraction amount of the medium pressure cylinder used for the heating network heater is measured by a flowmeter 54 for extracting steam from the medium pressure cylinder to the heating network heater; h is a zc Is the vapor extraction enthalpy value of the medium-pressure cylinder, h zc ＝h_pt(p zc ,t zc )，p zc The extraction pressure of the medium pressure cylinder is measured by an extraction pressure meter 444 of the medium pressure cylinder, t zc The extraction temperature of the medium pressure cylinder is measured by the extraction temperature meter 445; h is a zcs Is the water-repellent enthalpy value of a heating network heater, h zcs ＝t zcs X c, wherein t zcs Measured by a heat supply network heater hydrophobic thermometer 447, c is the specific heat capacity of water.
High back pressure exhaust steam heat supply q of exhaust steam waste heat utilization system fq
q fq ＝Q l ×(h b -h gs )
Wherein: q (Q) l The waste steam utilization amount of the waste steam waste heat utilization system is used; h is a b Is the exhaust enthalpy value of the low-pressure cylinder, h b ＝h_pt(p bp ,t bp )，p bp Is a low-pressure cylinder rowThe steam pressure is measured by a low-pressure cylinder steam discharge pressure gauge 413, t bp The exhaust temperature of the low-pressure cylinder is measured by a low-pressure cylinder exhaust thermometer 414; h is a gs Is the enthalpy value of condensation water of the high back pressure condenser, h gs ＝t gs ×c，t gs And c is the specific heat capacity of water measured by the high back pressure condenser condensation water thermometer 418.
The high-efficiency operation principle of the exhaust steam waste heat utilization system of the steam turbine is as follows:
mix(b zc ×q zc +b gb ×q fq )
and after the exhaust steam waste heat utilization system of the steam turbine is put into operation, the value is kept to be the minimum value under the variable boundary condition at the required time.
According to the calculation formulas of the injection ratio, the boosting ratio and the exhaust steam heat supply coal consumption of the medium pressure cylinder and the high back pressure exhaust steam heat supply coal consumption, the injection ratio and the boosting ratio of the steam booster are controlled to influence the exhaust steam heat supply coal consumption of the medium pressure cylinder and the high back pressure exhaust steam heat supply coal consumption, and the injection ratio and the boosting ratio of the steam booster are in a low position when the system heat supply coal consumption is near a design value. Therefore, the preferable control mode is to control the injection ratio and the boost ratio of the steam-increasing machine to be near the design value, and the high-efficiency operation principle of the waste steam waste heat utilization system of the steam-increasing machine is kept to be a minimum value under the variable boundary condition.
It should be noted that, for each exhaust enthalpy value h (h b 、h z ) If the exhaust steam is saturated steam, the exhaust steam enthalpy value can be inquired on an enthalpy entropy diagram according to the exhaust steam pressure and the exhaust steam temperature; if the exhaust steam is unsaturated steam, the exhaust steam enthalpy value h, h=h ' +x× (h "-h ') can be calculated according to the exhaust steam pressure and the exhaust steam dryness, h ' is the saturated water enthalpy under the corresponding exhaust steam pressure, h" is the dry saturated steam enthalpy under the corresponding exhaust steam pressure, and x is the exhaust steam dryness. The back pressure is 25-28 kPa, and the dryness value is 0.96; the back pressure is 28-31 kPa, and the dryness value is 0.97; the back pressure is 31-34 kPa, and the dryness value is 0.98; the back pressure is 34 to 37kPa, and the dryness value is 0.99. In other embodiments, the exhaust dryness is also 0.96 according to a fixed value, which can reflect the actual practice more accuratelyThe exhaust dryness is all right.
In other preferred embodiments, referring to fig. 3, the exhaust steam from the middle pressure cylinder 12 of the other steam turbine set 1 may be led to the main pipeline of the exhaust steam from the middle pressure cylinder 12 of the present steam turbine set 1, and the main pipeline is used to supply steam to the steam booster 421 and the heat supply network heater 44 together, and when the main pipeline is connected, the stop valve 442 of the exhaust steam waste heat utilization system from the exhaust steam from the other middle pressure cylinder is added to the corresponding steam guide pipeline.
The above embodiments are not intended to limit the scope of the present utility model, so: all equivalent changes in structure, shape and principle of the utility model should be covered in the scope of protection of the utility model.
Claims (8)
1. The performance monitoring and energy consumption metering system of the exhaust steam waste heat utilization system of the steam turbine is additionally arranged in the exhaust steam waste heat utilization system of the steam turbine, and is characterized in that: including setting up heat supply network circulating water flowmeter (52) in heat supply network circulating pipe network (4), set up middling pressure jar exhaust steam extraction to increase turbine flowmeter (53) on the power steam inlet pipeline of increase turbine (421), set up increase turbine exhaust steam thermometer (425) and increase turbine exhaust steam pressure gauge (426) on the exhaust pipeline of increase turbine (421), set up increase turbine condenser outlet water thermometer (424) on the exhaust pipeline of increase turbine condenser (42), set up increase turbine condenser water thermometer (428) on the exhaust pipeline of increase turbine condenser water (427), and set up high back pressure condenser outlet water thermometer (416) on the exhaust pipeline of high back pressure condenser (41).
2. The system for monitoring the performance and measuring the energy consumption of the exhaust steam waste heat utilization system of the steam turbine according to claim 1, wherein the system is characterized in that: the device also comprises a low-pressure cylinder exhaust pressure gauge (413) arranged on the exhaust pipeline of the low-pressure cylinder (13).
3. The system for monitoring the performance and measuring the energy consumption of the exhaust steam waste heat utilization system of the steam turbine according to claim 2, wherein the system is characterized in that: the device also comprises a low-pressure cylinder steam exhaust thermometer (414) arranged on a low-pressure cylinder (13) steam exhaust pipeline, a heat supply network circulating water backwater thermometer (415) arranged on a water inlet pipeline of the high-back pressure condenser (41) and a high-back pressure condenser condensed water thermometer (418) arranged on a water outlet pipeline of the high-back pressure condenser condensed water (417).
4. The system for monitoring and measuring the performance of the exhaust steam waste heat utilization system of the steam turbine according to claim 3, wherein the system is characterized in that: the air cooling island condensation water flow meter (51) is arranged on the water outlet pipeline of the air cooling island condensation water (32).
5. The system for monitoring and measuring the performance of the exhaust steam waste heat utilization system of the steam turbine according to claim 4, wherein the system is characterized in that: the air cooling island condensation water channel U-shaped bend (511) is additionally arranged on the air cooling island condensation water (32) outlet pipeline, and the air cooling island condensation water channel U-shaped bend (511) is arranged at the water outlet end of the air cooling island condensation water flowmeter (51).
6. The system for monitoring the performance and measuring the energy consumption of the exhaust steam waste heat utilization system of the steam turbine according to claim 4 or 5, wherein the system is characterized in that: the system also comprises a medium pressure cylinder exhaust steam extraction pressure gauge (444) and a medium pressure cylinder exhaust steam extraction temperature gauge (445) which are arranged on the medium pressure cylinder (12) exhaust steam extraction pipeline, a medium pressure cylinder exhaust steam extraction to heat supply network heater flowmeter (54) which is arranged on the heat supply network heater (44) steam inlet pipeline and a heat supply network heater drain temperature gauge (447) which is arranged on the heat supply network heater drain (446) pipeline.
7. The system for monitoring the performance and measuring the energy consumption of the exhaust steam waste heat utilization system of the steam turbine according to claim 1, wherein the system is characterized in that: the water outlet thermometer (443) of the heat supply network heater is additionally arranged in the heat supply network circulating pipe network (4).
8. The system for monitoring the performance and measuring the energy consumption of the exhaust steam waste heat utilization system of the steam turbine according to claim 1, wherein the system is characterized in that: and accessing into a DCS system of the power plant unit.
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| CN202321055124.0U CN219714769U (en) | 2023-05-05 | 2023-05-05 | Performance monitoring and energy consumption metering system for exhaust steam waste heat utilization system of steam turbine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202321055124.0U CN219714769U (en) | 2023-05-05 | 2023-05-05 | Performance monitoring and energy consumption metering system for exhaust steam waste heat utilization system of steam turbine |
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