CN104100314B - A kind of condensed steam type small steam turbine exhaust steam bootstrap system driving induced draught fan - Google Patents
A kind of condensed steam type small steam turbine exhaust steam bootstrap system driving induced draught fan Download PDFInfo
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- CN104100314B CN104100314B CN201410339471.5A CN201410339471A CN104100314B CN 104100314 B CN104100314 B CN 104100314B CN 201410339471 A CN201410339471 A CN 201410339471A CN 104100314 B CN104100314 B CN 104100314B
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Abstract
A kind of condensed steam type small steam turbine exhaust steam bootstrap system driving induced draught fan, the condensed steam type small turbine comprising main steam turbine and be connected with induced draught fan, the exhaust vent of small turbine is connected with small turbine vapour condenser, and the exhaust vent of main steam turbine is connected with main frame vapour condenser, condensate pump, precision processing device of condensation water, shaft sealing cooler and low pressure heat regenerative system successively; The outlet of shaft sealing cooler is also connected through the cooling water inlet of water of condensation bypass line with small turbine vapour condenser, the coolant outlet of small turbine vapour condenser and the water of condensation export pipeline of small turbine vapour condenser meet at coagulation hydroenergy backwater pipeline, and the outlet of coagulation hydroenergy backwater pipeline is connected with low pressure heat regenerative system.The present invention utilizes main frame water of condensation can fully reclaim small steam turbine exhaust steam waste heat as the cooling water source of small turbine vapour condenser, reduces the total cold source energy of system, and system is relatively simple, and operation maintenance workload is less, can be common to water chiller and Air-cooled Unit.
Description
Technical field
The invention belongs to station boiler and turbine system field, be specifically related to a kind of condensed steam type small steam turbine exhaust steam bootstrap system driving induced draught fan.
Background technique
Along with the maximization increasingly of coal-fired power plant's capacity, and the deep popularization of environmental transformation performs, and the capacity of boiler induced-draft fan also increases thereupon.Induced draught fan capacity brings the problems such as station service increases, inrush current is large, the raising of service power voltage grade needs after increasing.For making full use of primary energy, excavating boiler, steam turbine potentiality, improving the power supply capacity of unit, adopting small turbine to substitute motor has become a kind of trend to drive induced draught fan.Conventional small turbine has back pressure type and condensed steam type two kinds, and condensed steam type small turbine has better power savings advantages, but investment is also relatively high.Conventional condensed steam type small turbine, using electric power plant circulating water as cooling water source, needs to set up separately the equipment and system such as cooling water system and relevant filter screen, circulating water pump when building.Electric power plant circulating water clean degree is poor, and fouling condition aggravation in small condenser tube bank after long-time running, cause temperature conductivity to decline, the small turbine steam consumption increases.Simultaneously the operation maintenance workload of power plant and water consumption also increase thereupon.In addition, small turbine Cooling Tubes of Condenser bundle need carry out selection according to the water quality of circulating water, if the water quality that puts into operation is poor, small condenser manufacture cost may be caused to increase further.If for Air-cooled Unit, also need additionally to build mechanical force cooling column, continuation also increases by construction cost and water consumption.On the whole, the condensed steam type induced draught fan small turbine system construction investment that power plant puts into operation is large, operation maintenance workload is large, system complex, significantly limit it and extensively promotes.
In sum, develop that a kind of stable and reliable operation, system are relatively simple, operation maintenance workload is less, amount of energy saving significantly, the condensed steam type induced draught fan small turbine that can be common to water chiller and Air-cooled Unit is significant.
Summary of the invention
The object of the present invention is to provide a kind of condensed steam type small steam turbine exhaust steam bootstrap system driving induced draught fan, this system run all right is reliable, maintenance workload is less and amount of energy saving is remarkable.
In order to achieve the above object, the technical solution used in the present invention is: the condensed steam type small turbine comprising main steam turbine and be connected with induced draught fan, the exhaust vent of condensed steam type small turbine is connected with small turbine vapour condenser, and the exhaust vent of main steam turbine is connected with main frame vapour condenser, condensate pump, precision processing device of condensation water, shaft sealing cooler and low pressure heat regenerative system successively; The outlet of shaft sealing cooler is also connected through the cooling water inlet of water of condensation bypass line with small turbine vapour condenser, the coolant outlet of small turbine vapour condenser and the water of condensation export pipeline of small turbine vapour condenser meet at coagulation hydroenergy backwater pipeline, and the outlet of coagulation hydroenergy backwater pipeline is connected with low pressure heat regenerative system.
Described low pressure heat regenerative system is made up of low-pressure heater group after low-pressure heater group before the backwater point be connected and backwater point, the outlet of shaft sealing cooler is connected with the entrance of low-pressure heater group before the entrance of water of condensation bypass line and backwater point respectively through deaerator level control valve group, and the outlet of coagulation hydroenergy backwater pipeline is connected with the entrance of low-pressure heater group after backwater point.
Described low pressure heat regenerative system is by low-pressure heater group after the final stage low-pressure heater be communicated with successively, secondary final stage low-pressure heater and backwater point, and the outlet of shaft sealing cooler is connected with final stage low-pressure heater, the outlet of coagulation hydroenergy backwater pipeline is connected with the entrance of low-pressure heater group after the entrance of secondary final stage low-pressure heater or backwater point.
Be provided with deaerator level control valve group between low-pressure heater group after described secondary final stage low-pressure heater and backwater point, the entrance of deaerator level control valve group is connected with the outlet of coagulation hydroenergy backwater pipeline with the outlet of secondary final stage low-pressure heater respectively.
Described water of condensation bypass line is provided with flow control valve.
Spare duct by being provided with stop valve between the entrance and exit of described flow control valve is connected.
The water of condensation export pipeline of described small turbine vapour condenser is provided with the some little condensate pump be connected in parallel.
Compared with prior art, beneficial effect of the present invention is:
1) main steam turbine of the present invention is connected with main frame vapour condenser, the main frame water of condensation that main frame vapour condenser produces can replace traditional electric power plant circulating water to cool the steam discharge of the small turbine be connected with condensed steam type induced draught fan as cooling water source, thus the water quality of the cooling water source of small turbine vapour condenser is improved, eliminate the workload of small condenser periodic cleaning, also be conducive to the leakage reducing small condenser tube bank simultaneously, improve its operating conditions, improve the operational reliability of equipment.And using the main frame water of condensation of main frame vapour condenser generation as cooling water source, can fully reclaim small steam turbine exhaust steam waste heat, its advantageous effects is similar to low-level (stack-gas) economizer, adds the amount of energy saving of system.
2) the main frame water of condensation that produces using main frame vapour condenser of the present invention is as cooling water source, can lead in water chiller and Air-cooled Unit, eliminate the construction cost etc. of Air-cooled Unit small turbine building machine cooling tower.
3) the main frame water of condensation that produces using main frame vapour condenser of the present invention is as cooling water source, compared to using circulating water as cooling water source, is conducive to reducing the water consumption that generating is produced.
4) the main frame water of condensation that main frame vapour condenser produces is drawn from condensate pump outlet, saves the correlative investment of small turbine circulating water pump, also eliminates the construction cost that circulating water pipeline system pipe laying is arranged simultaneously, simplify system, be conducive to reducing investment.
Accompanying drawing explanation
Fig. 1 is a kind of condensed steam type small steam turbine exhaust steam bootstrap system schematic diagram driving induced draught fan of the present invention;
Fig. 2 is the condensed steam type small steam turbine exhaust steam bootstrap system schematic diagram that the present invention's another kind drives induced draught fan;
Wherein, 1, solidifying gas formula small turbine, 2, induced draught fan, 3, small turbine vapour condenser, 4, little condensate pump, 5, main steam turbine, 6, main frame vapour condenser, 7, condensate pump, 8, precision processing device of condensation water, 9, shaft sealing cooler, 10, deaerator level control valve group, 11, flow control valve, 12, stop valve, 13, low-pressure heater group before backwater point, 14, low-pressure heater group after backwater point.15, final stage low-pressure heater, 16, secondary final stage low-pressure heater.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further detailed explanation.
As depicted in figs. 1 and 2, the solidifying gas formula small turbine 1 that the present invention includes main steam turbine 5 and be connected with induced draught fan 2, the exhaust vent of solidifying gas formula small turbine 1 is connected with small turbine vapour condenser 3, and the exhaust vent of main steam turbine 5 is connected with main frame vapour condenser 6, condensate pump 7, precision processing device of condensation water 8, shaft sealing cooler 9 successively and low pressure heat regenerative system is connected, the outlet of shaft sealing cooler 9 is also connected through the cooling water inlet of water of condensation bypass line with small turbine vapour condenser 3, the coolant outlet of small turbine vapour condenser 3 and the water of condensation export pipeline of small turbine vapour condenser 3 meet at coagulation hydroenergy backwater pipeline, the outlet of coagulation hydroenergy backwater pipeline is connected with low pressure heat regenerative system, and water of condensation bypass line is provided with flow control valve 11, also be connected by the spare duct being provided with stop valve 12 between the entrance and exit of flow control valve 11, in order to control the condensing water flow entering small turbine vapour condenser, stop valve 12 is standby valve, be in normal off status, when flow control valve 11 fault, come into operation.The water of condensation export pipeline of small turbine vapour condenser 3 is provided with some the little condensate pumps 4 (preferably two) be connected in parallel, and when wherein one goes wrong, uses another.In addition, deaerator level control valve group 10 is provided with in the outlet port of shaft sealing cooler 9 of the present invention or low pressure heat regenerative system.
As shown in Figure 1, low pressure heat regenerative system of the present invention is made up of low-pressure heater group 14 after low-pressure heater group 13 before the backwater point be connected and backwater point, the outlet of shaft sealing cooler 9 is connected with the entrance of low-pressure heater group 13 before the entrance of water of condensation bypass line and backwater point respectively through deaerator level control valve group 10, and the outlet of coagulation hydroenergy backwater pipeline is connected with the entrance of low-pressure heater group 14 after backwater point.
The running principle of system is as shown in Figure 1: before operation, ensure deaerator level control valve group 10, flow control valve 11 opens, stop valve 12 is standby valve, is in normal off status.
The steam discharge of main steam turbine 5 produces main frame water of condensation after main frame vapour condenser 6 condenses, main frame water of condensation is divided into two-way through precision processing device of condensation water 8, shaft sealing cooler 9 and deaerator level control valve group 10 after condensate pump 7 boosts, the flow control valve 11 of one tunnel on water of condensation bypass line enters the cooling water inlet of small turbine vapour condenser 3 in order to cool the steam discharge of the small turbine be connected with condensed steam type induced draught fan, and reclaims the waste heat in the steam discharge of small turbine; Another road successively after low-pressure heater group 13 before backwater point and backwater point low-pressure heater group 14 discharge; After main frame water of condensation after recovery waste heat flows out from the coolant outlet of small turbine vapour condenser 3, the water of condensation that main frame water of condensation after recovery waste heat and small turbine vapour condenser 3 produce meets at coagulation hydroenergy backwater pipeline, then enters low-pressure heater group 14 after backwater point.
As shown in Figure 2, the present invention includes low-pressure heater group 14 after the final stage low-pressure heater 15 be communicated with successively, secondary final stage low-pressure heater 16, deaerator level control valve group 10 and backwater point, the outlet of shaft sealing cooler 9 is connected with final stage low-pressure heater 15, and the outlet of coagulation hydroenergy backwater pipeline is connected with the entrance of secondary final stage low-pressure heater 16 or the entrance of deaerator level control valve group 10.
The working principle of system is as shown in Figure 2: before operation, ensure deaerator level control valve group 10, flow control valve 11 opens, stop valve 12 is standby valve, is in normal off status.
The steam discharge of main steam turbine 5 produces main frame water of condensation after main frame vapour condenser 6 condenses, main frame water of condensation is after condensate pump 7 boosts, two-way is divided into after precision processing device of condensation water 8, shaft sealing cooler 9, one tunnel enters the cooling water inlet of small turbine vapour condenser 3 in order to cool the steam discharge of the solidifying gas formula small turbine be connected with condensed steam type induced draught fan through flow control valve 11, and reclaims the waste heat in the steam discharge of solidifying gas formula small turbine; Another road is discharged after low-pressure heater group 14 successively after final stage low-pressure heater 15, secondary final stage low-pressure heater 16, deaerator level control valve group 10 and backwater point.After main frame water of condensation after recovery waste heat flows out from the coolant outlet of small turbine vapour condenser 3, the water of condensation that main frame water of condensation after recovery waste heat and small turbine vapour condenser 3 produce meets at coagulation hydroenergy backwater pipeline, then, after after backwater point, after low-pressure heater group 14 process, discharge or the main frame water of condensation after recovery waste heat flow out from the coolant outlet of small turbine vapour condenser 3, the water of condensation that the main frame water of condensation after recovery waste heat and small turbine vapour condenser 3 produce meets at coagulation hydroenergy backwater pipeline;
When the outlet of coagulation hydroenergy backwater pipeline is connected with the entrance of secondary final stage low-pressure heater 16, the water of condensation that the main frame water of condensation after recovery waste heat and small turbine vapour condenser 3 produce enters low-pressure heater group 14 through time final stage low-pressure heater 16, deaerator level control valve group 10;
When the outlet of coagulation hydroenergy backwater pipeline is connected with the entrance of deaerator level control valve group 10, the water of condensation that the main frame water of condensation after recovery waste heat and small turbine vapour condenser 3 produce enters low-pressure heater group 14 after deaerator level control valve group 10.
Enter flow control valve 11 that the water of condensation bypass line of small turbine vapour condenser 3 is arranged in system as depicted in figs. 1 and 2 in order to control the assignment of traffic of the cooling water branch road of small turbine vapour condenser 3, thus make can realize regulating from the assignment of traffic of total condensing water flow 0 ~ 100% as the flow on the water of condensation bypass line of the main frame water of condensation of small turbine vapour condenser 3 cooling water.And the present invention utilizes (main steam turbine) water of condensation to replace circulating water as the cooling water source of induced draught fan small turbine vapour condenser, fully to reclaim small steam turbine exhaust steam waste heat, and simplify condensed steam type small turbine system, improve the reliability of system cloud gray model, reduce condensed steam type small turbine operation maintenance workload.Stop valve 12 is standby valve, is in normal off status.When flow control valve 11 fault, come into operation.
Claims (4)
1. one kind drives the condensed steam type small steam turbine exhaust steam bootstrap system of induced draught fan, it is characterized in that: the condensed steam type small turbine (1) comprising main steam turbine (5) and be connected with induced draught fan (2), the exhaust vent of condensed steam type small turbine (1) is connected with small turbine vapour condenser (3), and the exhaust vent of main steam turbine (5) is connected with main frame vapour condenser (6), condensate pump (7), precision processing device of condensation water (8), shaft sealing cooler (9) and low pressure heat regenerative system successively; The outlet of shaft sealing cooler (9) is also connected through the cooling water inlet of water of condensation bypass line with small turbine vapour condenser (3), the coolant outlet of small turbine vapour condenser (3) and the water of condensation export pipeline of small turbine vapour condenser (3) meet at coagulation hydroenergy backwater pipeline, and the outlet of coagulation hydroenergy backwater pipeline is connected with low pressure heat regenerative system;
Described low pressure heat regenerative system is made up of low-pressure heater group (14) after low-pressure heater group (13) before the backwater point be connected and backwater point, the outlet of shaft sealing cooler (9) is connected with the entrance of low-pressure heater group (13) before the entrance of water of condensation bypass line and backwater point respectively through deaerator level control valve group (10), and the outlet of coagulation hydroenergy backwater pipeline is connected with the entrance of low-pressure heater group (14) after backwater point;
Described water of condensation bypass line is provided with flow control valve (11);
The water of condensation export pipeline of described small turbine vapour condenser (3) is provided with the some little condensate pump (4) be connected in parallel.
2. the condensed steam type small steam turbine exhaust steam bootstrap system of driving induced draught fan according to claim 1, it is characterized in that: described low pressure heat regenerative system is by low-pressure heater group (14) after the final stage low-pressure heater (15) be communicated with successively, secondary final stage low-pressure heater (16) and backwater point, and the outlet of shaft sealing cooler (9) is connected with final stage low-pressure heater (15), the outlet of coagulation hydroenergy backwater pipeline is connected with the entrance of low-pressure heater group (14) after the entrance of time final stage low-pressure heater (16) or backwater point.
3. the condensed steam type small steam turbine exhaust steam bootstrap system of driving induced draught fan according to claim 2, it is characterized in that: be provided with deaerator level control valve group (10) between low-pressure heater group (14) after described secondary final stage low-pressure heater (16) and backwater point, the entrance of deaerator level control valve group (10) is connected with the outlet of coagulation hydroenergy backwater pipeline with the outlet of secondary final stage low-pressure heater (16) respectively.
4. the condensed steam type small steam turbine exhaust steam bootstrap system of driving induced draught fan according to claim 1, is characterized in that: the spare duct by being provided with stop valve (12) between the entrance and exit of described flow control valve (11) is connected.
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| CN113107879A (en) * | 2021-04-08 | 2021-07-13 | 西安热工研究院有限公司 | Double-fed system-based primary fan system of wet cooling unit |
| CN112963374A (en) * | 2021-04-08 | 2021-06-15 | 西安热工研究院有限公司 | Double-fed system-based boiler blower system of wet cooling unit |
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- 2014-07-16 CN CN201410339471.5A patent/CN104100314B/en active Active
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| DE4302486A1 (en) * | 1993-01-29 | 1994-08-04 | Abb Patent Gmbh | Method and device for operating the water-steam cycle of a thermal power plant |
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