CN104989470A - Energy gradient utilization system and method for small turbine of thermal power plant - Google Patents
Energy gradient utilization system and method for small turbine of thermal power plant Download PDFInfo
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- CN104989470A CN104989470A CN201510387881.1A CN201510387881A CN104989470A CN 104989470 A CN104989470 A CN 104989470A CN 201510387881 A CN201510387881 A CN 201510387881A CN 104989470 A CN104989470 A CN 104989470A
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Abstract
The invention relates to an energy gradient utilization system and method for a small turbine of a thermal power plant. Currently, steam feed pump systems and steam induced draft fan systems have many defects. The system comprises a main steam turbine, a main steam feeding pipe, a main steam feeding regulation valve, a feed pump drive small turbine, a feed pump connection shaft and a feed pump. The system is characterized by further comprising a first steam feeding pipe, a first regulation valve, a first induced draft fan drive small steam turbine, a first induced draft fan connection shaft and a first induced draft fan, wherein one end of the first steam feeding pipe is connected to the feed pump drive small turbine, the other end of the first steam feeding pipe is connected to the first induced draft fan drive small steam turbine, and the first regulation valve is arranged on the first steam feeding pipe. The method comprises the steps that the main steam turbine only provides steam for the feed pump drive small turbine directly, and then a part of steam obtained after acting in the feed pump drive small turbine is directly pumped to the induced draft fan drive small steam turbine to drive the small turbine to act. The energy gradient utilization system and method can conveniently and effectively achieve energy gradient utilization.
Description
Technical field
The present invention relates to a kind of cascaded utilization of energy system and method, especially relate to a kind of thermal power plant small turbine cascaded utilization of energy system and method, can the vapour system of reasonable Arrangement small turbine, thus reach the efficiency utilization of energy.
Background technique
At present, the feed water pump that thermal power plant's generator set is supporting and induced draught fan majority adopt motoring, and part adopts small turbine to drive.The feed water pump of motoring and induced draught fan, its electric energy is from the station service of thermal power plant, and this kind of mode adds station-service electricity, reduces electricity volume.And adopt small turbine to drive feed water pump and induced draught fan effectively can reduce the station service power consumption rate of thermal power plant, reduce cost of electricity-generating, and when unit load changes, there is good adjusting function.Therefore, increasing thermal power plant adopts small turbine to drive feed water pump and induced draught fan, such as publication date is on 02 11st, 2015, publication number is in the Chinese patent of CN204152560U, disclosing a kind of circulating power station Steam Turbine Driven feed-water pump adopts small turbine to drive feed water pump, this circulating power station Steam Turbine Driven feed-water pump uses main steam turbine unit to provide steam power source, vapor recycle enters small turbine from small turbine admission piping, steam driven small turbine runs, and the exhaust heat boiler feed water pump making small turbine drive to be attached thereto runs, the steam doing merit is discharged by small steam turbine exhaust steam piping and is circulated to low pressure main steam unit, finally get back to the acting of main steam turbine unit and reclaim heat.But, the small turbine system driving feed water pump and the small turbine system driving induced draught fan are separate, the driving steam of small turbine takes from the difference section of drawing gas of main steam turbine respectively, to supporting main steam turbine manufacture and design and safe operation is had higher requirement; In addition, after driving a large amount of steam actings of feed water pump small turbine, the direct form with exhaust enters vapour condenser, and energy is not fully utilized, and causes huge low-temperature receiver energy loss.To sum up, also there is above-mentioned deficiency and shortcoming in current steam feed pump system and steam-driven induced draft fan system, finds the energy utilization rate that solution to the problems described above will contribute to improving thermal power plant's generator set.
Summary of the invention
The object of the invention is to overcome above shortcomings in prior art, and provide a kind of structure very simple, reasonable in design, design is unique, can facilitate, effectively reduce driving feed water pump small turbine low-temperature receiver energy loss, realize thermal power plant's small turbine cascaded utilization of energy system and method for cascaded utilization of energy.
The present invention's adopted technological scheme that solves the problem is: this thermal power plant's small turbine cascaded utilization of energy system comprises main steam turbine, main steam inlet tube, main admission regulating valve, drive feed water pump small turbine, feed water pump coupling shaft, feed water pump, boiler, vaporizer, supply pipe and main steam pipe, one end of described main steam pipe is connected with vaporizer, the other end of this main steam pipe is connected with main steam turbine, described vaporizer is connected with boiler, one end of described supply pipe is connected with boiler, one end of described main steam inlet tube is connected on main steam turbine, the other end of this main steam inlet tube is connected to and drives on feed water pump small turbine, described main admission regulating valve is arranged on main steam inlet tube, one end of described feed water pump coupling shaft is connected to and drives on feed water pump small turbine, the other end of this feed water pump coupling shaft is connected on feed water pump, its structural feature is: also comprise a steam inlet pipe, a modulating valve, a driving induced draught fan small turbine, an induced draught fan coupling shaft, an induced draught fan, high-pressure heater, hyperbaric heating pipe, No. three modulating valve, low-pressure heater, a low-pressure heating pipe and No. four modulating valve, one end of a described steam inlet pipe is connected to and drives on feed water pump small turbine, the other end of this steam inlet pipe is connected on a driving induced draught fan small turbine, a described modulating valve is arranged on a steam inlet pipe, one end of a described induced draught fan coupling shaft is connected on a driving induced draught fan small turbine, the other end of this induced draught fan coupling shaft is connected on an induced draught fan, described high-pressure heater and low-pressure heater are installed on supply pipe, one end of described hyperbaric heating pipe is connected on a steam inlet pipe, one end of this hyperbaric heating pipe is between driving feed water pump small turbine and a modulating valve, the other end of described hyperbaric heating pipe is connected on high-pressure heater, described No. three modulating valve are arranged on hyperbaric heating pipe, one end of a described low-pressure heating pipe is connected on a driving induced draught fan small turbine, the other end of this low-pressure heating pipe is connected on low-pressure heater, described No. four modulating valve are arranged on a low-pressure heating pipe.Above-mentioned technical characteristics of the present invention forms an impartible entirety, above-mentioned technical characteristics of the present invention can not be isolated into a few part to treat completely, the present invention use the entire combination of these technical characteristicss to achieve to solve simultaneously simultaneously in prior art to supporting main steam turbine manufacture and design and safe operation requires height, and drive a large amount of steam energies of feed water pump small turbine to be difficult to the problem of being fully used, and overall structure is simple, is easy to be extended and applied.
As preferably, the present invention also comprises No. two steam inlet pipes, No. two modulating valve, No. two driving induced draught fan small turbines, No. two induced draught fan coupling shafts, No. two induced draught fans, No. two low-pressure heating pipes and No. five modulating valve, one end of described No. two steam inlet pipes is connected on a steam inlet pipe, one end of these No. two steam inlet pipes is between driving feed water pump small turbine and a modulating valve, the other end of described No. two steam inlet pipes is connected on No. two driving induced draught fan small turbines, described No. two modulating valve are arranged on No. two steam inlet pipes, one end of described No. two induced draught fan coupling shafts is connected on No. two driving induced draught fan small turbines, the other end of these No. two induced draught fan coupling shafts is connected on No. two induced draught fans, one end of described No. two low-pressure heating pipes is connected on No. two driving induced draught fan small turbines, the other end of these No. two low-pressure heating pipes is connected on low-pressure heater, described No. five modulating valve are arranged on No. two low-pressure heating pipes.
As preferably, the present invention also comprises other source of the gas steam inlet pipe and other source of the gas steam inlet pipe modulating valve, one end of described other source of the gas steam inlet pipes is connected on a steam inlet pipe, one end of these other source of the gas steam inlet pipe is between a modulating valve and a driving induced draught fan small turbine, and described other source of the gas steam inlet pipe modulating valve is arranged on other source of the gas steam inlet pipe.
As preferably, the present invention also comprises No. two other source of the gas steam inlet pipes and No. two other source of the gas steam inlet pipe modulating valve, one end of described No. two other source of the gas steam inlet pipes is connected on No. two steam inlet pipes, one end of these No. two other source of the gas steam inlet pipes is between No. two modulating valve and No. two driving induced draught fan small turbines, and described No. two other source of the gas steam inlet pipe modulating valve are arranged on No. two other source of the gas steam inlet pipes.
A kind of thermal power plant small turbine cascaded utilization of energy method, its feature is: the step of described method is: the main steam produced in vaporizer enters main steam turbine along main steam pipe, main steam turbine only provides steam directly to driving feed water pump small turbine, steam after driving part in feed water pump small turbine to do work is after pressure and temperature parameter reduces, part steam is directly evacuated to and drives induced draught fan small turbine to drive the acting of induced draught fan small turbine, the feedwater in low-pressure heater heated feed water pipe is caused after driving the steam acting of induced draught fan small turbine acting, another part steam is evacuated to the feedwater in high-pressure heater heated feed water pipe, the heat of steam is fully exploited, reduce the low-temperature receiver energy loss driving feed water pump small turbine and drive induced draught fan small turbine, reach the cascade utilization object of steam energy.
A kind ofly utilize thermal power plant's small turbine cascaded utilization of energy system and thermal power plant's small turbine cascaded utilization of energy method of carrying out, its feature is: the step of described method is: the main steam produced in vaporizer enters main steam turbine along main steam pipe, main steam turbine only provides steam directly to driving feed water pump small turbine, steam after driving part in feed water pump small turbine to do work is after pressure and temperature parameter reduces, part steam is directly evacuated to a driving induced draught fan small turbine and drives a driving induced draught fan small turbine acting, caused the feedwater in low-pressure heater heated feed water pipe by a low-pressure heating pipe and No. four modulating valve after the steam acting of driving induced draught fan small turbine acting, another part steam is evacuated to the feedwater in high-pressure heater heated feed water pipe along hyperbaric heating pipe, the heat of steam is fully exploited, reduce the low-temperature receiver energy loss driving feed water pump small turbine and a driving induced draught fan small turbine, reach the cascade utilization object of steam energy.
A kind ofly utilize thermal power plant's small turbine cascaded utilization of energy system and thermal power plant's small turbine cascaded utilization of energy method of carrying out, its feature is: the step of described method is: the main steam produced in vaporizer enters main steam turbine along main steam pipe, main steam turbine only provides steam directly to driving feed water pump small turbine, steam after driving part in feed water pump small turbine to do work is after pressure and temperature parameter reduces, part steam is directly evacuated to a driving induced draught fan small turbine and No. two driving induced draught fan small turbines, drive a driving induced draught fan small turbine and No. two driving induced draught fan small turbine actings respectively, caused the feedwater in low-pressure heater heated feed water pipe by a low-pressure heating pipe and No. four modulating valve after the steam acting of driving induced draught fan small turbine acting, caused the feedwater in low-pressure heater heated feed water pipe by No. two low-pressure heating pipes and No. five modulating valve after the steam acting of No. two driving induced draught fan small turbines acting, another part steam is evacuated to the feedwater in high-pressure heater heated feed water pipe along hyperbaric heating pipe, the heat of steam is fully exploited, reduce and drive feed water pump small turbine, the low-temperature receiver energy loss of a driving induced draught fan small turbine and No. two driving induced draught fan small turbines, reach the cascade utilization object of steam energy.
The present invention compared with prior art, have the following advantages and effect: structure is very simple, be convenient to transform existing equipment, be easy to be extended and applied, wide market, the steam of main steam turbine only needs supply to drive feed water pump small turbine, just can realize reducing manufacturing and designing and the requirement of safe operation supporting main steam turbine by simple structure simultaneously, the sufficient a large amount of steam energies utilizing driving feed water pump small turbine, and reduce the object driving feed water pump small turbine low-temperature receiver energy loss.
Accompanying drawing explanation
Fig. 1 is the structural representation of thermal power plant's small turbine cascaded utilization of energy system in the embodiment of the present invention 1.
Fig. 2 is the structural representation of thermal power plant's small turbine cascaded utilization of energy system in the embodiment of the present invention 2.
In figure: 1, main steam turbine; 2, main steam inlet tube; 3, main admission regulating valve; 4, feed water pump small turbine is driven; 5, feed water pump coupling shaft; 6, feed water pump; 7, a steam inlet pipe; 8, a modulating valve; 9, a driving induced draught fan small turbine; 10, an induced draught fan coupling shaft; 11, an induced draught fan; 12, No. two steam inlet pipes; 13, No. two modulating valve; 14, No. two driving induced draught fan small turbines; 15, No. two induced draught fan coupling shafts; 16, No. two induced draught fans; 17, other source of the gas steam inlet pipe; 18, other source of the gas steam inlet pipe modulating valve; 19, No. two other source of the gas steam inlet pipes; 20, No. two other source of the gas steam inlet pipe modulating valve; 21, boiler; 22, vaporizer; 23, supply pipe; 24, main steam pipe; 25, high-pressure heater; 26, hyperbaric heating pipe; 27, No. three modulating valve; 28, low-pressure heater; 29, a low-pressure heating pipe; 30, No. four modulating valve; 31, No. two low-pressure heating pipes; 32, No. five modulating valve.
Embodiment
Below in conjunction with accompanying drawing, also by embodiment, the present invention is described in further detail, and following examples are explanation of the invention and the present invention is not limited to following examples.
Embodiment 1.
See Fig. 1, thermal power plant's small turbine cascaded utilization of energy system in the present embodiment is by main steam turbine 1, main steam inlet tube 2, main admission regulating valve 3, drive feed water pump small turbine 4, feed water pump coupling shaft 5, feed water pump 6, a steam inlet pipe 7, a modulating valve 8, a driving induced draught fan small turbine 9, an induced draught fan coupling shaft 10, an induced draught fan 11, other source of the gas steam inlet pipe 17, other source of the gas steam inlet pipe modulating valve 18, boiler 21, vaporizer 22, supply pipe 23, main steam pipe 24, high-pressure heater 25, hyperbaric heating pipe 26, No. three modulating valve 27, low-pressure heater 28, a low-pressure heating pipe 29 and No. four modulating valve 30 form.
In the present embodiment, one end of main steam pipe 24 is connected with vaporizer 22, and the other end of this main steam pipe 24 is connected with main steam turbine 1, and vaporizer 22 is connected with boiler 21, and one end of supply pipe 23 is connected with boiler 21.
One end of main steam inlet tube 2 in the present embodiment is connected on main steam turbine 1, the other end of this main steam inlet tube 2 is connected to and drives on feed water pump small turbine 4, main admission regulating valve 3 is arranged on main steam inlet tube 2, one end of feed water pump coupling shaft 5 is connected to and drives on feed water pump small turbine 4, and the other end of this feed water pump coupling shaft 5 is connected on feed water pump 6.
One end of a steam inlet pipe 7 in the present embodiment is connected to and drives on feed water pump small turbine 4, the other end of this steam inlet pipe 7 is connected on a driving induced draught fan small turbine 9, a modulating valve 8 is arranged on a steam inlet pipe 7, one end of an induced draught fan coupling shaft 10 is connected on a driving induced draught fan small turbine 9, and the other end of this induced draught fan coupling shaft 10 is connected on an induced draught fan 11.
One end of other source of the gas steam inlet pipes 17 in the present embodiment is connected on a steam inlet pipe 7, one end of these other source of the gas steam inlet pipe 17 is between a modulating valve 8 and a driving induced draught fan small turbine 9, and other source of the gas steam inlet pipe modulating valve 18 is arranged on other source of the gas steam inlet pipe 17.
High-pressure heater 25 in the present embodiment and low-pressure heater 28 are installed on supply pipe 23, one end of hyperbaric heating pipe 26 is connected on a steam inlet pipe 7, one end of this hyperbaric heating pipe 26 is between driving feed water pump small turbine 4 and a modulating valve 8, the other end of hyperbaric heating pipe 26 is connected on high-pressure heater 25, and No. three modulating valve 27 are arranged on hyperbaric heating pipe 26.One end of a low-pressure heating pipe 29 is connected on a driving induced draught fan small turbine 9, and the other end of this low-pressure heating pipe 29 is connected on low-pressure heater 28, and No. four modulating valve 30 are arranged on a low-pressure heating pipe 29.
The step of the thermal power plant's small turbine cascaded utilization of energy method in the present embodiment is: the main steam produced in vaporizer 22 enters main steam turbine 1 along main steam pipe 24, main steam turbine 1 is only direct provides steam by main steam inlet tube 2 to driving feed water pump small turbine 4, steam after driving part in feed water pump small turbine 4 to do work is after pressure and temperature parameter reduces, part steam is directly evacuated to a driving induced draught fan small turbine 9 by a steam inlet pipe 7 and drives a driving induced draught fan small turbine 9 to do work, caused the feedwater in low-pressure heater 28 heated feed water pipe 23 by a low-pressure heating pipe 29 and No. four modulating valve 30 after the steam acting of driving induced draught fan small turbine 9 acting, another part steam is evacuated to the feedwater in high-pressure heater 25 heated feed water pipe 23 along hyperbaric heating pipe 26, the heat of steam is fully exploited, reduce the low-temperature receiver energy loss driving feed water pump small turbine 4 and a driving induced draught fan small turbine 9, reach the cascade utilization object of steam energy.
Embodiment 2.
See Fig. 2, thermal power plant's small turbine cascaded utilization of energy system in the present embodiment is by main steam turbine 1, main steam inlet tube 2, main admission regulating valve 3, drive feed water pump small turbine 4, feed water pump coupling shaft 5, feed water pump 6, a steam inlet pipe 7, a modulating valve 8, a driving induced draught fan small turbine 9, an induced draught fan coupling shaft 10, an induced draught fan 11, No. two steam inlet pipes 12, No. two modulating valve 13, No. two driving induced draught fan small turbines 14, No. two induced draught fan coupling shafts 15, No. two induced draught fans 16, other source of the gas steam inlet pipe 17, other source of the gas steam inlet pipe modulating valve 18, No. two other source of the gas steam inlet pipes 19, No. two other source of the gas steam inlet pipe modulating valve 20, boiler 21, vaporizer 22, supply pipe 23, main steam pipe 24, high-pressure heater 25, hyperbaric heating pipe 26, No. three modulating valve 27, low-pressure heater 28, a low-pressure heating pipe 29, No. four modulating valve 30, No. two low-pressure heating pipes 31 and No. five modulating valve 32 form.
In the present embodiment, one end of main steam pipe 24 is connected with vaporizer 22, and the other end of this main steam pipe 24 is connected with main steam turbine 1, and vaporizer 22 is connected with boiler 21, and one end of supply pipe 23 is connected with boiler 21.
One end of main steam inlet tube 2 in the present embodiment is connected on main steam turbine 1, the other end of this main steam inlet tube 2 is connected to and drives on feed water pump small turbine 4, main admission regulating valve 3 is arranged on main steam inlet tube 2, one end of feed water pump coupling shaft 5 is connected to and drives on feed water pump small turbine 4, and the other end of this feed water pump coupling shaft 5 is connected on feed water pump 6.
One end of a steam inlet pipe 7 in the present embodiment is connected to and drives on feed water pump small turbine 4, the other end of this steam inlet pipe 7 is connected on a driving induced draught fan small turbine 9, a modulating valve 8 is arranged on a steam inlet pipe 7, one end of an induced draught fan coupling shaft 10 is connected on a driving induced draught fan small turbine 9, and the other end of this induced draught fan coupling shaft 10 is connected on an induced draught fan 11.
One end of No. two steam inlet pipes 12 in the present embodiment is connected on a steam inlet pipe 7, one end of these No. two steam inlet pipes 12 is between driving feed water pump small turbine 4 and a modulating valve 8, the other end of No. two steam inlet pipes 12 is connected on No. two driving induced draught fan small turbines 14, No. two modulating valve 13 are arranged on No. two steam inlet pipes 12, one end of No. two induced draught fan coupling shafts 15 is connected on No. two driving induced draught fan small turbines 14, and the other end of these No. two induced draught fan coupling shafts 15 is connected on No. two induced draught fans 16.
In the present embodiment, one end of other source of the gas steam inlet pipes 17 is connected on a steam inlet pipe 7, one end of these other source of the gas steam inlet pipe 17 is between a modulating valve 8 and a driving induced draught fan small turbine 9, and other source of the gas steam inlet pipe modulating valve 18 is arranged on other source of the gas steam inlet pipe 17.
In the present embodiment, one end of No. two other source of the gas steam inlet pipes 19 is connected on No. two steam inlet pipes 12, one end of these No. two other source of the gas steam inlet pipes 19 is between No. two modulating valve 13 and No. two driving induced draught fan small turbines 14, and No. two other source of the gas steam inlet pipe modulating valve 20 are arranged on No. two other source of the gas steam inlet pipes 19.
High-pressure heater 25 in the present embodiment and low-pressure heater 28 are installed on supply pipe 23, one end of hyperbaric heating pipe 26 is connected on a steam inlet pipe 7, one end of this hyperbaric heating pipe 26 is between driving feed water pump small turbine 4 and a modulating valve 8, the other end of hyperbaric heating pipe 26 is connected on high-pressure heater 25, and No. three modulating valve 27 are arranged on hyperbaric heating pipe 26.
In the present embodiment, one end of a low-pressure heating pipe 29 is connected on a driving induced draught fan small turbine 9, and the other end of this low-pressure heating pipe 29 is connected on low-pressure heater 28, and No. four modulating valve 30 are arranged on a low-pressure heating pipe 29.One end of No. two low-pressure heating pipes 31 is connected on No. two driving induced draught fan small turbines 14, and the other end of these No. two low-pressure heating pipes 31 is connected on low-pressure heater 28, and No. five modulating valve 32 are arranged on No. two low-pressure heating pipes 31.
The step of the thermal power plant's small turbine cascaded utilization of energy method in the present embodiment is: the main steam produced in vaporizer 22 enters main steam turbine 1 along main steam pipe 24, main steam turbine 1 is only direct provides steam by main steam inlet tube 2 to driving feed water pump small turbine 4, steam after driving part in feed water pump small turbine 4 to do work is after pressure and temperature parameter reduces, part steam is directly evacuated to a driving induced draught fan small turbine 9 and No. two driving induced draught fan small turbines 14 respectively by a steam inlet pipe 7 and No. two steam inlet pipes 12, a driving induced draught fan small turbine 9 and No. two driving induced draught fan small turbines 14 are driven to do work respectively, caused the feedwater in low-pressure heater 28 heated feed water pipe 23 by a low-pressure heating pipe 29 and No. four modulating valve 30 after the steam acting of driving induced draught fan small turbine 9 acting, caused the feedwater in low-pressure heater 28 heated feed water pipe 23 by No. two low-pressure heating pipes 31 and No. five modulating valve 32 after the steam acting of No. two driving induced draught fan small turbines 14 acting, another part steam is evacuated to the feedwater in high-pressure heater 25 heated feed water pipe 23 along hyperbaric heating pipe 26, the heat of steam is fully exploited, reduce and drive feed water pump small turbine 4, the low-temperature receiver energy loss of a driving induced draught fan small turbine 9 and No. two driving induced draught fan small turbines 14, reach the cascade utilization object of steam energy.
Embodiment 3.
See Fig. 1 and Fig. 2, in the present embodiment, the step of thermal power plant's small turbine cascaded utilization of energy method is: the main steam produced in vaporizer 22 enters main steam turbine 1 along main steam pipe 24, main steam turbine 1 only provides steam directly to driving feed water pump small turbine 4, steam after driving part in feed water pump small turbine 4 to do work is after pressure and temperature parameter reduces, part steam is directly evacuated to and drives induced draught fan small turbine to drive the acting of induced draught fan small turbine, the feedwater in low-pressure heater 28 heated feed water pipe 23 is caused after driving the steam acting of induced draught fan small turbine acting, another part steam is evacuated to the feedwater in high-pressure heater 25 heated feed water pipe 23, the heat of steam is fully exploited, reduce the low-temperature receiver energy loss driving feed water pump small turbine 4 and drive induced draught fan small turbine, reach the cascade utilization object of steam energy.
In addition, it should be noted that, the specific embodiment described in this specification, the shape, institute's title of being named etc. of its parts and components can be different, and the above content described in this specification is only to structure example of the present invention explanation.The equivalence change that structure, feature and the principle of all foundations described in inventional idea of the present invention are done or simple change, be included in the protection domain of patent of the present invention.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment; only otherwise depart from structure of the present invention or surmount this scope as defined in the claims, protection scope of the present invention all should be belonged to.
Claims (7)
1. thermal power plant's small turbine cascaded utilization of energy system, comprise main steam turbine (1), main steam inlet tube (2), main admission regulating valve (3), drive feed water pump small turbine (4), feed water pump coupling shaft (5), feed water pump (6), boiler (21), vaporizer (22), supply pipe (23) and main steam pipe (24), one end of described main steam pipe (24) is connected with vaporizer (22), the other end of this main steam pipe (24) is connected with main steam turbine (1), described vaporizer (22) is connected with boiler (21), one end of described supply pipe (23) is connected with boiler (21), one end of described main steam inlet tube (2) is connected on main steam turbine (1), the other end of this main steam inlet tube (2) is connected to and drives on feed water pump small turbine (4), described main admission regulating valve (3) is arranged on main steam inlet tube (2), one end of described feed water pump coupling shaft (5) is connected to and drives on feed water pump small turbine (4), the other end of this feed water pump coupling shaft (5) is connected on feed water pump (6), it is characterized in that: also comprise a steam inlet pipe (7), a modulating valve (8), a driving induced draught fan small turbine (9), an induced draught fan coupling shaft (10), an induced draught fan (11), high-pressure heater (25), hyperbaric heating pipe (26), No. three modulating valve (27), low-pressure heater (28), a low-pressure heating pipe (29) and No. four modulating valve (30), one end of a described steam inlet pipe (7) is connected to and drives on feed water pump small turbine (4), the other end of this steam inlet pipe (7) is connected on a driving induced draught fan small turbine (9), a described modulating valve (8) is arranged on a steam inlet pipe (7), one end of a described induced draught fan coupling shaft (10) is connected on a driving induced draught fan small turbine (9), the other end of this induced draught fan coupling shaft (10) is connected on an induced draught fan (11), described high-pressure heater (25) and low-pressure heater (28) are installed on supply pipe (23), one end of described hyperbaric heating pipe (26) is connected on a steam inlet pipe (7), one end of this hyperbaric heating pipe (26) is positioned at and drives between feed water pump small turbine (4) and a modulating valve (8), the other end of described hyperbaric heating pipe (26) is connected on high-pressure heater (25), described No. three modulating valve (27) are arranged on hyperbaric heating pipe (26), one end of a described low-pressure heating pipe (29) is connected on a driving induced draught fan small turbine (9), the other end of this low-pressure heating pipe (29) is connected on low-pressure heater (28), described No. four modulating valve (30) are arranged on a low-pressure heating pipe (29).
2. thermal power plant according to claim 1 small turbine cascaded utilization of energy system, it is characterized in that: also comprise No. two steam inlet pipes (12), No. two modulating valve (13), No. two driving induced draught fan small turbines (14), No. two induced draught fan coupling shafts (15), No. two induced draught fans (16), No. two low-pressure heating pipes (31) and No. five modulating valve (32), one end of described No. two steam inlet pipes (12) is connected on a steam inlet pipe (7), one end of these No. two steam inlet pipes (12) is positioned at and drives between feed water pump small turbine (4) and a modulating valve (8), the other end of described No. two steam inlet pipes (12) is connected on No. two driving induced draught fan small turbines (14), described No. two modulating valve (13) are arranged on No. two steam inlet pipes (12), one end of described No. two induced draught fan coupling shafts (15) is connected on No. two driving induced draught fan small turbines (14), the other end of these No. two induced draught fan coupling shafts (15) is connected on No. two induced draught fans (16), one end of described No. two low-pressure heating pipes (31) is connected on No. two driving induced draught fan small turbines (14), the other end of these No. two low-pressure heating pipes (31) is connected on low-pressure heater (28), described No. five modulating valve (32) are arranged on No. two low-pressure heating pipes (31).
3. thermal power plant according to claim 1 small turbine cascaded utilization of energy system, it is characterized in that: also comprise other source of the gas steam inlet pipe (17) and other source of the gas steam inlet pipe modulating valve (18), one end of described other source of the gas steam inlet pipes (17) is connected on a steam inlet pipe (7), one end of this No. one other source of the gas steam inlet pipes (17) is positioned between a modulating valve (8) and a driving induced draught fan small turbine (9), and described other source of the gas steam inlet pipe modulating valve (18) is arranged on other source of the gas steam inlet pipe (17).
4. thermal power plant according to claim 2 small turbine cascaded utilization of energy system, it is characterized in that: also comprise No. two other source of the gas steam inlet pipes (19) and No. two other source of the gas steam inlet pipe modulating valve (20), one end of described No. two other source of the gas steam inlet pipes (19) is connected on No. two steam inlet pipes (12), one end of these No. two other source of the gas steam inlet pipes (19) is positioned between No. two modulating valve (13) and No. two driving induced draught fan small turbines (14), and described No. two other source of the gas steam inlet pipe modulating valve (20) are arranged on No. two other source of the gas steam inlet pipes (19).
5. thermal power plant's small turbine cascaded utilization of energy method, it is characterized in that: the step of described method is: the main steam produced in vaporizer (22) enters main steam turbine (1) along main steam pipe (24), main steam turbine (1) only provides steam directly to driving feed water pump small turbine (4), steam after driving part in feed water pump small turbine (4) to do work is after pressure and temperature parameter reduces, part steam is directly evacuated to and drives induced draught fan small turbine to drive the acting of induced draught fan small turbine, the feedwater in low-pressure heater (28) heated feed water pipe (23) is caused after driving the steam acting of induced draught fan small turbine acting, another part steam is evacuated to the feedwater in high-pressure heater (25) heated feed water pipe (23), the heat of steam is fully exploited, reduce the low-temperature receiver energy loss driving feed water pump small turbine (4) and drive induced draught fan small turbine, reach the cascade utilization object of steam energy.
6. one kind utilizes thermal power plant's small turbine cascaded utilization of energy system as described in claim 1 or 3 and thermal power plant's small turbine cascaded utilization of energy method of carrying out, it is characterized in that: the step of described method is: the main steam produced in vaporizer (22) enters main steam turbine (1) along main steam pipe (24), main steam turbine (1) only provides steam directly to driving feed water pump small turbine (4), steam after driving part in feed water pump small turbine (4) to do work is after pressure and temperature parameter reduces, part steam is directly evacuated to a driving induced draught fan small turbine (9) and drives driving induced draught fan small turbine (9) acting, caused the feedwater in low-pressure heater (28) heated feed water pipe (23) by a low-pressure heating pipe (29) and No. four modulating valve (30) after the steam acting that driving induced draught fan small turbine (9) is done work, another part steam is evacuated to the feedwater in high-pressure heater (25) heated feed water pipe (23) along hyperbaric heating pipe (26), the heat of steam is fully exploited, reduce the low-temperature receiver energy loss driving feed water pump small turbine (4) and a driving induced draught fan small turbine (9), reach the cascade utilization object of steam energy.
7. one kind utilizes thermal power plant's small turbine cascaded utilization of energy system as described in claim 2 or 4 and thermal power plant's small turbine cascaded utilization of energy method of carrying out, it is characterized in that: the step of described method is: the main steam produced in vaporizer (22) enters main steam turbine (1) along main steam pipe (24), main steam turbine (1) only provides steam directly to driving feed water pump small turbine (4), steam after driving part in feed water pump small turbine (4) to do work is after pressure and temperature parameter reduces, part steam is directly evacuated to a driving induced draught fan small turbine (9) and No. two driving induced draught fan small turbines (14), drive a driving induced draught fan small turbine (9) and No. two driving induced draught fan small turbine (14) actings respectively, caused the feedwater in low-pressure heater (28) heated feed water pipe (23) by a low-pressure heating pipe (29) and No. four modulating valve (30) after the steam acting that driving induced draught fan small turbine (9) is done work, caused the feedwater in low-pressure heater (28) heated feed water pipe (23) by No. two low-pressure heating pipes (31) and No. five modulating valve (32) after the steam acting that No. two driving induced draught fan small turbines (14) are done work, another part steam is evacuated to the feedwater in high-pressure heater (25) heated feed water pipe (23) along hyperbaric heating pipe (26), the heat of steam is fully exploited, reduce and drive feed water pump small turbine (4), the low-temperature receiver energy loss of a driving induced draught fan small turbine (9) and No. two driving induced draught fan small turbines (14), reach the cascade utilization object of steam energy.
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