CN104948244A - Supercritical thermal power generation system constructed through subcritical thermal power generation system - Google Patents
Supercritical thermal power generation system constructed through subcritical thermal power generation system Download PDFInfo
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Abstract
The invention relates to a supercritical thermal power generation system constructed through a subcritical thermal power generation system. The supercritical thermal power generation system comprises a supercritical once-through boiler, a front steam turbine, a booster pump and a downstream generator unit of the subcritical thermal power generation system. The main steam of the supercritical once-through boiler drives the front steam turbine set to work. The parameter of steam which is done with work in the front steam turbine is transformed into subcritical steam, and the subcritical steam enters the downstream generator unit of the subcritical thermal power generation system through a pipeline to work. The efficiency of the supercritical unit thermal power generation system is equal to that of an existing co-content supercritical thermal power generation system and is higher than that of the original subcritical thermal power generation system. Through the design of the supercritical thermal power generation system constructed through the subcritical thermal power generation system, the construction cost of the supercritical thermal power generation system is decreased, waste caused by the detachment of the subcritical thermal power generation system in the service period due to reconstruction is avoided at the same time, the cost performance is high, the advantages of being economical and practical are achieved, the construction speed is high, and the ideal approaches to replace a big one with a small one and replace the supercritical thermal power generation system with the subcritical thermal power generation system are realized through a thermal system.
Description
Technical field
The present invention relates to a kind of thermodynamic system, particularly utilize the supercritical thermodynamic power generation system that subcritical heat power generating system builds.
Background technique
The main steam pressure of subcritical heat power generating system at 15.7-19.6Mpa, the main steam pressure >=22MPa of supercritical thermodynamic power generation system.Supercritical thermodynamic power generation system is the representative of advanced technology in current field of thermal power, and because the temperature and pressure of main steam is higher, therefore generating efficiency is also higher.For the supercritical thermodynamic power generation system of a 600MW, compare the subcritical heat power generating system of the higher 600MW of existing efficiency, within 1 year, about can save 50,000 tons of standard coals, energy-saving effect is very remarkable.In addition, supercritical thermodynamic power generation system can reduce the pollution to environment while economizing on coal, and 600MW supercritical thermodynamic power generation system compares the discharge amount that the subcritical heat power generating system of 600MW can reduce by the harmful matter such as lime-ash and a large amount of carbon dioxide, sulfur dioxide and nitrogen oxide of about 7000 tons for a year.Therefore supercritical thermodynamic power generation system is a kind of energy saving environmental protection product with development prospect.At present, thermal power industry has a large amount of subcritical heat power generating systems in operation, particularly the subcritical heat power generating system of 300MW capacitance grade occupies sizable ratio, and require according to energy-conserving and environment-protective and country's " upper large pressure is little " policy, these thermodynamic systems will progressively be removed superseded.But in view of the large percentage of the total amount that generates electricity shared by existing subcritical heat power generating system generated energy, and a considerable amount of subcritical heat power generating system is also not long for service time, if the subcritical heat power generating system of remove these in repowering phase still under arms will certainly cause great waste.Therefore, make full use of the capital equipment of existing subcritical heat power generating system, with less investment reconstruction supercritical thermodynamic power generation system, thus significantly reducing the construction cost of supercritical thermodynamic power generation system, is a kind of desirable route had compared with high performance-price ratio and very fast reconstruction speed.
Summary of the invention
The object of the present invention is to provide a kind of supercritical thermodynamic power generation system utilizing subcritical heat power generating system to build, described supercritical unit thermodynamic system makes full use of existing subcritical heat power generating system device resource, significantly can reduce supercritical thermodynamic power generation system investment cost, accelerate the reconstruction paces of the subcritical heat power generating system of high energy consumption.
Problem of the present invention realizes with following technical proposals:
A kind of supercritical thermodynamic power generation system utilizing subcritical heat power generating system to build, comprise supercritical once-through boiler, top turbine, suction booster, the downstream generator set of hybrid heater and subcritical heat power generating system, described downstream generator set comprises high-pressure cylinder, intermediate pressure cylinder, low pressure (LP) cylinder, vapour condenser, condensate pump, oxygen-eliminating device, low-pressure heater group and high-pressure heater group, the major steam line of supercritical once-through boiler is communicated with the steam inlet of top turbine, top turbine steam (vapor) outlet pipeline is communicated with high-pressure cylinder steam inlet line, high-pressure cylinder steam (vapor) outlet pipeline is communicated with reheated steam cold section of pipeline of supercritical once-through boiler, the reheated steam hot arc pipeline connection intermediate pressure cylinder steam inlet line of supercritical once-through boiler, intermediate pressure cylinder steam (vapor) outlet pipeline is communicated with the steam inlet of low pressure (LP) cylinder, low pressure (LP) cylinder steam (vapor) outlet pipeline connects vapour condenser, vapour condenser connects condensate pump, condensate pump connects low-pressure heater group, low-pressure heater group connects oxygen-eliminating device, oxygen-eliminating device connects feed water pump, feed water pump connects high-pressure heater group, high-pressure heater group rising pipe is communicated with hybrid heater, hybrid heater is communicated with suction booster, suction booster is communicated with supercritical once-through boiler delivery (pipe) line.
The above-mentioned supercritical thermodynamic power generation system utilizing subcritical heat power generating system to build, the number of described downstream generator set is 1-4 cover, downstream generator set arrange two covers above time, each cover downstream generator set specification, structure are identical, the high-pressure cylinder steam inlet line of each cover downstream generator set is connected in parallel top turbine steam (vapor) outlet pipeline, and the intermediate pressure cylinder steam inlet line of each cover downstream generator set is connected in parallel reheated steam hot arc pipeline; The high-pressure heater group rising pipe of each cover downstream generator set is all communicated with hybrid heater, high-pressure cylinder steam (vapor) outlet pipeline all cold section of pipeline connections with reheated steam of each cover downstream generator set.
The above-mentioned supercritical thermodynamic power generation system utilizing subcritical heat power generating system to build, the pressure in major steam line is 23-26.5MPa, temperature 590-605 DEG C, and the pressure in supercritical once-through boiler delivery (pipe) line is 25-29.5MPa, temperature 290-320 DEG C; Pressure in reheated steam cold section of pipeline is 3.3-3.7MPa, and temperature is 306-325 DEG C, and the pressure in reheated steam hot arc pipeline is 3.1-3.5MPa, and temperature is 527-542 DEG C.
The above-mentioned supercritical thermodynamic power generation system utilizing subcritical heat power generating system to build, described top turbine is provided with top turbine extraction line, puts extracted steam from turbine pipeline communication hybrid heater.
The above-mentioned supercritical thermodynamic power generation system utilizing subcritical heat power generating system to build, the high-pressure heater group of each cover downstream generator set comprises the first high-pressure heater, the second high-pressure heater and third high pressure heater, first high-pressure heater is communicated with the intermediate pressure cylinder extraction opening of this cover downstream generator set, and the second high-pressure heater, third high pressure heater is communicated with the high-pressure cylinder steam (vapor) outlet pipeline of this cover downstream generator set high-pressure cylinder respectively; The low-pressure heater group of each cover downstream generator set comprises the first low-pressure heater, the second low-pressure heater, the 3rd low-pressure heater and the 4th low-pressure heater, and each low-pressure heater is communicated with the low pressure (LP) cylinder extraction opening of this cover downstream generator set respectively.
Supercritical thermodynamic power generation system provided by the invention comprises the downstream generator set of supercritical once-through boiler, top turbine and the existing subcritical heat power generating system of number cover.Described supercritical thermodynamic power generation system substitutes the drum boiler of subcritical heat power generating system with supercritical once-through boiler, the main steam of supercritical once-through boiler drives top turbine acting, the steam finishing merit in top turbine changes Sub-critical Parameter steam into, then the downstream generator set acting of subcritical heat power generating system is entered by pipeline, farthest utilize existing subcritical heat power generating system equipment, thus reduce newly-built Large Copacity supercritical thermodynamic power generation system construction investment expense, improve the utilization ratio of existing equipment.Supercritical thermodynamic power generation system provided by the present invention is suitable with existing same Capacity Supercritical heat power generating system efficiency, far above former subcritical heat power generating system efficiency.Adopt design of the present invention, while reduction supercritical thermodynamic power generation system construction cost, can avoid removing because of reconstruction the waste that military service phase subcritical heat power generating system causes, be that one has compared with high performance-price ratio, economical and practical, and very fast reconstruction velocity interpolation thermodynamic system change large, change " surpassing " with " Asia " desirable route with little.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the invention will be further described.
Fig. 1 is the schematic diagram of first embodiment of the invention;
Fig. 2 is the schematic diagram of second embodiment of the invention;
Fig. 3 is the schematic diagram of third embodiment of the invention;
Fig. 4 is the schematic diagram of four embodiment of the invention.
In figure, each list of reference numerals is: 1, supercritical once-through boiler; 2, major steam line; 3, top turbine; 4, top turbine steam (vapor) outlet pipeline; 5, high-pressure cylinder steam inlet line; 6, high-pressure cylinder; 7, high-pressure cylinder steam (vapor) outlet pipeline; 8, reheated steam cold section of pipeline; 9, supercritical once-through boiler delivery (pipe) line; 10, reheated steam hot arc pipeline; 11, intermediate pressure cylinder steam inlet line; 12, intermediate pressure cylinder; 13, intermediate pressure cylinder steam (vapor) outlet pipeline; 14, low pressure (LP) cylinder; 15, generator; 16, low pressure (LP) cylinder steam (vapor) outlet pipeline; 17, vapour condenser; 18, condensate pump; 19-1, the first low-pressure heater; 19-2, the second low-pressure heater; 19-3, the 3rd low-pressure heater; 19-4, the 4th low-pressure heater; 20, oxygen-eliminating device, 21, feed water pump; 22-1, the first high-pressure heater; 22-2, the second high-pressure heater; 22-3, third high pressure heater; 23, high-pressure heater group rising pipe; 24, hybrid heater; 25, suction booster; 26, top turbine extraction line; 27, top turbine generator.
Embodiment
Supercritical thermodynamic power generation system is compared with subcritical heat power generating system, and in its high-pressure cylinder, what steam is supercritical parameter at first, and what rear steam parameter is down to subcritical by this.Therefore, supercritical thermodynamic power generation system of the present invention makes full use of the existing downstream generator set relevant device compared with the subcritical heat power generating system of small capacity, by the reasonable disposition of parameter, the parameter matching when steam parameter (top turbine steam discharge parameter) entering downstream generator set high-pressure cylinder is run with former Subcritical Units, meet the condition range of equipment, farthest reduce reconstruction expense.
Referring to Fig. 1, this is preferred first embodiment (one drag two) of the present invention.This embodiment utilizes the downstream generator set device of the subcritical thermodynamic system of the existing 300MW of two covers (part of empty wire frame representation in accompanying drawing) to become the supercritical thermodynamic power generation system of 660MW grade with device build such as the supercritical once-through boiler 1 set up, top turbine 3, suction booster 25, hybrid heaters 24.The downstream generator unit structure of the former subcritical thermodynamic system of two covers arranges identical, is called the first downstream generator set, the second downstream generator set.Each downstream generator set comprises high-pressure cylinder 6, intermediate pressure cylinder 12, low pressure (LP) cylinder 14, generator 15, vapour condenser 17, condensate pump 18, oxygen-eliminating device 20, feed water pump 21, low-pressure heater group and high-pressure heater group respectively.Join vapour owing to reconstructing rear downstream unit high-pressure cylinder without the need to carrying out, therefore high-pressure cylinder is without the need to arranging governing stage again.The high-pressure heater group of each cover downstream generator set comprises the first high-pressure heater 22-1, the second high-pressure heater 22-2 and third high pressure heater 22-3; The low-pressure heater group of each cover downstream generator set comprises the first low-pressure heater 19-1, the second low-pressure heater 19-2, the 3rd low-pressure heater 19-3 and the 4th low-pressure heater 19-4.The concrete structure of embodiment shown in Fig. 1 is as follows: the major steam line 2 of supercritical once-through boiler 1 is communicated with the steam inlet of top turbine 3, and top turbine steam (vapor) outlet pipeline 4 is connected in parallel the high-pressure cylinder steam inlet line 5 of the first downstream generator set, the second downstream generator set; The high-pressure cylinder steam (vapor) outlet pipeline 7 of the first downstream generator set, the second downstream generator set is all connected with the reheated steam of supercritical once-through boiler cold section of pipeline 8, reheated steam hot arc pipeline 10 parallel communication of supercritical once-through boiler is communicated with the steam inlet of the low pressure (LP) cylinder 14 of respective unit respectively to the intermediate pressure cylinder steam (vapor) outlet pipeline 13 of intermediate pressure cylinder steam inlet line 11, the first downstream generator set of the first downstream generator set, the second downstream generator set, the second downstream generator set; At each downstream generator set, low pressure (LP) cylinder steam (vapor) outlet pipeline 16 connects vapour condenser 17, and vapour condenser connects condensate pump 18, condensate pump connects low-pressure heater group, low-pressure heater group connects oxygen-eliminating device 20, and oxygen-eliminating device connects feed water pump 21, and feed water pump connects high-pressure heater group; The high-pressure heater group rising pipe 23 of the first downstream generator set, the second downstream generator set is all communicated with hybrid heater 24, and hybrid heater is communicated with suction booster 25, and suction booster is communicated with supercritical once-through boiler delivery (pipe) line 9.
Still referring to Fig. 1, shown in Fig. 1, the thermal procession of the first embodiment is as follows: the supercritical parameter main steam that supercritical DC furnace 1 produces enters top turbine 3 by major steam line 2 and does work, pressure in major steam line is 23-26MPa, temperature is 590-605 DEG C, and top turbine 3 drags a top turbine generator 27 separately.The vapor (steam) temperature pressure finishing merit in top turbine all reduces, pressure is 8.6-11.7Mpa, temperature is 465-490 DEG C, flow 1650-1850t/h, all mate with the pressure of former subcritical heat power generating system, temperature, flow after shunting, under making the operating mode of downstream generator set operating energy loss operating mode of former subcritical heat power generating system, play maximal efficiency.The two strands of steam entering high-pressure cylinder steam inlet line 5 by top turbine steam (vapor) outlet pipeline 4 are equivalent by valve regulated, enter the first downstream generator set respectively, the high-pressure cylinder 6 of the second downstream generator set does work, the two strands of steam finishing merit in two high-pressure cylinders enter reheated steam cold section of pipeline 8 respectively by high-pressure cylinder steam (vapor) outlet pipeline 7 and converge for one steam enters supercritical once-through boiler 1 reheating, reheated steam cold section of temperature 306-321 DEG C, pressure 3.3-3.7MPa, enters the reheated steam flow 1380-1580t/h of boiler; Vapor pressure after reheating is 3.1-3.5MPa, and temperature is 527-542 DEG C.The intermediate pressure cylinder steam inlet line 11 of the first downstream generator set, the second downstream generator set is entered by reheated steam hot arc pipeline 10, enter the first downstream generator set again, the intermediate pressure cylinder 12 of the second downstream generator set does work, the two strands of steam entering intermediate pressure cylinder are equivalent by valve regulated.Ensuing thermal procession first downstream generator set, second downstream generator set is identical, therefore illustrate for the first downstream generator set: the steam discharge of intermediate pressure cylinder 12 enters low pressure (LP) cylinder 14 by intermediate pressure cylinder steam (vapor) outlet pipeline 13, low pressure (LP) cylinder steam discharge enters vapour condenser 17 through low pressure (LP) cylinder steam (vapor) outlet pipeline 16 to carry out condensation and becomes water of condensation, water of condensation enters the first low-pressure heater 19-1 after being boosted by condensate pump 18 successively, second low-pressure heater 19-2, 3rd low-pressure heater 19-3, 4th low-pressure heater 19-4 enters oxygen-eliminating device 20 deoxygenation after heating, water outlet enters the first high-pressure heater 22-1 after being boosted by feed water pump 21 successively, second high-pressure heater 22-2, third high pressure heater 22-3, 4th high-pressure heater 22-4 heats.The high-pressure heater group rising pipe 23 of the first downstream generator set, the second downstream generator set converges into one feedwater, enter contact(-type) heater 24 to heat, the thermal source of hybrid heater 24 draws gas for introducing top turbine through preposition extracted steam from turbine pipeline 26, contact(-type) heater water outlet enter suction booster 25 carry out supercharging after pressure be 26-29MPa, temperature 290-320 DEG C, flow 1950-2150t/h, squeeze into supercritical once-through boiler heating through supercritical once-through boiler delivery (pipe) line 9, again become supercritical parameter steam.So far, whole thermodynamic system one is taken turns carbonated drink flow process and is terminated.The supercritical unit thermodynamic system top turbine generator power that this embodiment builds is about 100MW, and every platform downstream generator power is about 280MW, and complete machine is 660MW grade, and efficiency can reach 48.6%.The supercritical thermodynamic power generation system efficiency built with same capacity conventional method is suitable, far above the efficiency of former Subcritical Units 45.0%.
The number of units of the subcritical heat power generating system that current most power plant runs is even number, therefore the supercritical thermodynamic power generation system that utilizes two to build a larger capacity compared with the downstream generator set of the former subcritical heat power generating system of small capacity is as the supercritical thermodynamic power generation system being built into 660MW grade with the downstream generator set of two subcritical heat power generating systems of 300MW that embodiment 1 provides, or the supercritical thermodynamic power generation system of 1300MW grade is built into the downstream generator set of two subcritical heat power generating systems of 600MW, it is the embodiment of a kind of most Economy and feasibility.Its structure of supercritical thermodynamic power generation system of 1300MW grade and thermal procession and the first embodiment is built into roughly the same with the downstream generator set of two subcritical heat power generating systems of 600MW, the running parameter of capital equipment is as follows: supercritical once-through boiler feed temperature 290-320 DEG C, pressure 25-29.5MPa, flow 3950-4250t/h; Main steam temperature 590-605 DEG C, pressure 23-26.5MPa; Top turbine exhaust temperature 465-495 DEG C, pressure 8.6-12MPa flow 3350-3650t/h; Temperature 315-325 DEG C, pressure 3.3-3.7MPa in reheated steam cold section of pipeline; Temperature 527-542 DEG C in reheated steam hot arc pipeline, pressure 3.1-3.5MPa, enter the reheated steam flow 2820-3120t/h of supercritical once-through boiler; Top turbine generator power is about 180MW, and every platform downstream generator power is about 560MW; Complete machine is 1300MW grade.
Referring to Fig. 2, this is the schematic diagram (one-to-one) of second embodiment of the invention.This embodiment utilizes the downstream generator set device of a subcritical heat power generating system of existing 600MW to build a 660MW grade supercritical heat power generating system.The subcritical heat power generating system of highly energy-consuming that this embodiment is applicable to larger capacity reconstructs the supercritical thermodynamic power generation system into low power consuming on the spot.Structure difference compared with the first embodiment of the second embodiment is the downstream generator set that make use of a set of subcritical heat power generating system, and its thermal procession and the first embodiment roughly the same, do not repeat herein.The running parameter of the second embodiment capital equipment is as follows: supercritical once-through boiler feed temperature 290-320 DEG C, pressure 25-28MPa, flow 1940-2140t/h; Main steam temperature 590-605 DEG C, pressure 23-26MPa; Top turbine exhaust temperature 465-495 DEG C, pressure 8.6-12MPa, flow 1620-1820t/h; Temperature 315-325 DEG C, pressure 3.3-3.7MPa in reheated steam cold section of pipeline; Hot arc temperature 527-542 DEG C, pressure 3.1-3.5MPa, enter the reheated steam flow 1350-1550t/h of supercritical once-through boiler; Top turbine generator power is about 100MW, and downstream generator power is about 560MW; Complete machine 660MW grade.
Referring to Fig. 3, this is the schematic diagram (drags three) of third embodiment of the invention.3rd embodiment utilizes the downstream generator set device of the subcritical heat power generating system of three cover 300MW to build a 1000MW grade supercritical heat power generating system, the structure of the 3rd embodiment is the downstream generator set that make use of a set of subcritical heat power generating system more compared with the first embodiment, first downstream generator set, the second downstream generator set, the 3rd downstream generator set are arranged in parallel, 3rd embodiment thermal procession and the first embodiment roughly the same, do not repeat herein.The running parameter of the 3rd embodiment capital equipment is as follows: supercritical once-through boiler feed temperature 290-320 DEG C, pressure 26-29MPa, flow 2970-3220t/h; Temperature 590-605 DEG C in major steam line, pressure 23-26MPa; Top turbine exhaust temperature 465-490 DEG C, pressure 8.6-11.7MPa, flow 2570-2820t/h; Temperature 306-321 DEG C, pressure 3.3-3.7MPa in reheated steam cold section of pipeline; Temperature 527-542 DEG C in reheated steam hot arc pipeline, pressure 3.1-3.5MPa, enter the reheated steam flow 2150-2400t/h of supercritical once-through boiler; Top turbine generator power is about 160MW, every platform downstream generator power about 280MW; Complete machine 1000MW grade.
Referring to Fig. 4, this is the schematic diagram (drags four) of four embodiment of the invention.4th embodiment can utilize the downstream generator set of the subcritical heat power generating system of four cover 300MW to build the supercritical thermodynamic power generation system of a 1300MW grade; The structure of the 4th embodiment make use of the downstream generator set of the subcritical heat power generating system of two covers more compared with the first embodiment, first downstream generator set, the second downstream generator set, the 3rd downstream generator set, the 4th downstream generator set are arranged in parallel, 4th embodiment thermal procession and the first embodiment roughly the same, do not repeat herein.The running parameter of the 4th embodiment capital equipment is as follows: supercritical once-through boiler feed temperature 290-320 DEG C, pressure 26-29.5MPa, flow 4000-4300t/h; Main steam temperature 590-605 DEG C, pressure 23-26.5MPa; Top turbine exhaust temperature 465-490 DEG C, pressure 8.6-11.7MPa, flow 3440-3740t/h; Temperature 306-321 DEG C, pressure 3.3-3.7MPa in reheated steam cold section of pipeline; Temperature 527-542 DEG C in the cold and hot pipeline of reheated steam, pressure 3.1-3.5MPa, enter the reheated steam flow 2900-3200t/h of supercritical once-through boiler; Top turbine generator power is about 180MW, and every platform downstream generator power is about 280MW; Complete machine 1300MW grade.
Claims (5)
1. the supercritical thermodynamic power generation system utilizing subcritical heat power generating system to build, it is characterized in that: comprise supercritical once-through boiler (1), top turbine (3), suction booster (25), the downstream generator set of hybrid heater (24) and subcritical heat power generating system, described downstream generator set comprises high-pressure cylinder (6), intermediate pressure cylinder (12), low pressure (LP) cylinder (14), vapour condenser (17), condensate pump (18), oxygen-eliminating device (20), low-pressure heater group and high-pressure heater group, the major steam line (2) of supercritical once-through boiler is communicated with the steam inlet of top turbine, top turbine steam (vapor) outlet pipeline (4) is communicated with high-pressure cylinder steam inlet line (5), high-pressure cylinder steam (vapor) outlet pipeline (7) is communicated with reheated steam cold section of pipeline (8) of supercritical once-through boiler, the reheated steam hot arc pipeline (10) of supercritical once-through boiler is communicated with intermediate pressure cylinder steam inlet line (11), intermediate pressure cylinder steam (vapor) outlet pipeline (13) is communicated with the steam inlet of low pressure (LP) cylinder (14), low pressure (LP) cylinder steam (vapor) outlet pipeline (16) connects vapour condenser (17), vapour condenser connects condensate pump (18), condensate pump connects low-pressure heater group, low-pressure heater group connects oxygen-eliminating device (20), oxygen-eliminating device connects feed water pump (21), feed water pump connects high-pressure heater group, high-pressure heater group rising pipe (23) is communicated with hybrid heater (24), hybrid heater is communicated with suction booster (25), suction booster is communicated with supercritical once-through boiler delivery (pipe) line (9).
2. the supercritical thermodynamic power generation system utilizing subcritical heat power generating system to build according to claim 1, it is characterized in that: the number of described downstream generator set is 1-4 cover, downstream generator set arrange two covers above time, each cover downstream generator set specification, structure are identical, the high-pressure cylinder steam inlet line (5) of each cover downstream generator set is connected in parallel top turbine steam (vapor) outlet pipeline (4), and the intermediate pressure cylinder steam inlet line (11) of each cover downstream generator set is connected in parallel reheated steam hot arc pipeline (10); The high-pressure heater group rising pipe (23) of each cover downstream generator set is all communicated with hybrid heater, and all cold with the reheated steam section pipeline (8) of high-pressure cylinder steam (vapor) outlet pipeline (7) of each cover downstream generator set is communicated with.
3. the supercritical thermodynamic power generation system utilizing subcritical heat power generating system to build according to claim 2, it is characterized in that: the pressure in major steam line (2) is 23-26.5MPa, temperature 590-605 DEG C, pressure in supercritical once-through boiler delivery (pipe) line (9) is 25-29.5MPa, temperature 290-320 DEG C; Pressure in reheated steam cold section of pipeline is 3.3-3.7MPa, and temperature is 306-325 DEG C, and the pressure in reheated steam hot arc pipeline is 3.1-3.5MPa, and temperature is 527-542 DEG C.
4. the supercritical thermodynamic power generation system utilizing subcritical heat power generating system to build according to claim 3, it is characterized in that: described top turbine is provided with top turbine extraction line (26), put extracted steam from turbine pipeline communication hybrid heater (24).
5. the supercritical thermodynamic power generation system utilizing subcritical heat power generating system to build according to claim 4, it is characterized in that: the high-pressure heater group of each cover downstream generator set comprises the first high-pressure heater (22-1), the second high-pressure heater (22-2) and third high pressure heater (22-3), first high-pressure heater is communicated with the intermediate pressure cylinder extraction opening of this cover downstream generator set, and the second high-pressure heater, third high pressure heater is communicated with the high-pressure cylinder steam (vapor) outlet pipeline of this cover downstream generator set high-pressure cylinder respectively; The low-pressure heater group of each cover downstream generator set comprises the first low-pressure heater (19-1), the second low-pressure heater (19-2), the 3rd low-pressure heater (19-3) and the 4th low-pressure heater (19-4), and each low-pressure heater is communicated with the low pressure (LP) cylinder extraction opening of this cover downstream generator set respectively.
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