CN205349443U - Gas steam combination system - Google Patents
Gas steam combination system Download PDFInfo
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- CN205349443U CN205349443U CN201521144229.9U CN201521144229U CN205349443U CN 205349443 U CN205349443 U CN 205349443U CN 201521144229 U CN201521144229 U CN 201521144229U CN 205349443 U CN205349443 U CN 205349443U
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Abstract
The utility model relates to a gas steam combination system, include: fuel unit, steam circuit and preheating heat exchanger, preheating heat exchanger has the first heat transfer passageway and the second heat transfer passageway of mutually supporting, the import of first heat transfer passageway with the extraction opening butt joint, the export of first heat transfer passageway is the fume emission mouth, import and the fuel source or the butt joint of air source of second heat transfer passageway, the export of second heat transfer passageway with the fuel inlet or the air intlet butt joint of fuel turbine. Preheating heat exchanger makes fuel or air temperature rise, makes more large -traffic steam get into the steam turbine acting to reduce exhaust gas temperature, improved whole gas steam combination system's efficiency. Preheating heat exchanger does not change gas steam endless steam operating parameter, need not adopt the better material of temperature resistant resistance to pressure, avoids improving entire system's cost in increasing the heat efficiency by a wide margin.
Description
Technical field
This utility model belongs to energy field, is specifically related to a kind of combustion and steam association system.
Background technology
The operating condition of combustion and steam association system adjusts in real time according to its load condition, and due to the change of load, combustion and steam association system tends not to generate electricity at full capacity, and during underload, combustion and steam association system is relatively inefficient.
Improving steam cycle efficiency main path at present is that the steam inlet condition increasing steam turbine is thus improving the mechanical efficiency of steam turbine, but, select steam turbine and the waste heat boiler of higher pressure and higher temperature, increase considerably power plant's initial cost, payoff period is longer, no matter it is new-built unit or old Transformation of Unit, is all unfavorable for promoting.
Summary of the invention
Based on this, this utility model is in that to overcome the defect of prior art, it is provided that a kind of combustion and steam association system, the thermal efficiency is high, and equipment manufacturing cost is low.
Its technical scheme is as follows:
A kind of combustion and steam association system, including: fuel unit, described fuel unit includes gas turbine；Steam circuit, described steam circuit is provided with waste heat boiler, steam turbine, is provided with residual heat flue in described waste heat boiler, and described residual heat flue is provided with bleeding point；Preheating heat exchanger, described preheating heat exchanger has the first heat exchanger channels and the second heat exchanger channels that cooperate；Wherein, described residual heat flue docks with the exhanst gas outlet of described gas turbine, the import of described first heat exchanger channels is docked with described bleeding point, the outlet of described first heat exchanger channels is fume emission mouth, the import of described second heat exchanger channels is docked with fuels sources or air source, and the outlet of described second heat exchanger channels is docked with fuel inlet or the air intlet of described gas turbine.
Wherein in an embodiment, between described bleeding point and described preheating heat exchanger, it is provided with flow control valve.
Wherein in an embodiment, the air intlet of described gas turbine is provided with temperature sensor；Or, the fuel inlet of described gas turbine is provided with temperature sensor.
Wherein in an embodiment, the flue-gas temperature entering described preheating heat exchanger by described bleeding point from described residual heat flue is 90 DEG C to 110 DEG C.
Wherein in an embodiment, also including fuel heater, described fuel heater has the 3rd heat exchanger channels and the 4th heat exchanger channels that match；Described steam circuit is additionally provided with condenser, from described condenser, the pipeline to the pipeline of described waste heat boiler or in described waste heat boiler is provided with pump mouth, and from described condenser, the pipeline to the pipeline of described waste heat boiler or in described waste heat boiler is provided with water supplement port；Wherein, the import of described 3rd heat exchanger channels, outlet are docked with described pump mouth, described water supplement port respectively, the import of described 4th heat exchanger channels is docked with the outlet of described second heat exchanger channels, and the outlet of described 4th heat exchanger channels is docked with the fuel inlet of described gas turbine.
Wherein in an embodiment, described steam circuit is additionally provided with at least one-level steam circulation heat exchanger, described steam circulation heat exchanger is installed in described residual heat flue, on flow of flue gas direction in described residual heat flue, described bleeding point is positioned at the upstream of most end one-level steam circulation heat exchanger or described bleeding point is concordant with most end one-level steam circulation heat exchanger.
Wherein in an embodiment, the outlet of described residual heat flue is additionally provided with waste heat chimney, and described waste heat chimney is provided with gas returning port, and the outlet of described first heat exchanger channels is docked with described gas returning port.
A kind of combustion and steam association system progress control method, including: fuel and air enter work by combustion in gas turbine, flue gas after acting enters the residual heat flue of waste heat boiler, and the feedwater in waste heat boiler is heated, becoming steam after feedwater heating, steam enters steam turbine acting；Flue gas in the residual heat flue of waste heat boiler enters preheating heat exchanger by the bleeding point on residual heat flue, flue gas enters in the first heat exchanger channels of preheating heat exchanger, and heat the fuel in the second heat exchanger channels or air, fuel or air after intensification enter gas turbine work by combustion, flue gas is lowered the temperature, and the flue gas lowered the temperature is discharged from the outlet of the first heat exchanger channels.
Wherein in an embodiment, the temperature of the gas turbine air intake place air detected according to temperature sensor or the temperature of fuel inlet place fuel, regulate flow control valve, control to enter the flue gas flow of preheating heat exchanger in residual heat flue, thus controlling the temperature of fuel or the air entering gas turbine.
The beneficial effects of the utility model are in that:
Flue gas enters in the first heat exchanger channels of preheating heat exchanger, and heats the second heat exchanger channels fuel or air, and fuel or air after intensification enter gas turbine work by combustion.Preheating heat exchanger makes fuel or air themperature raise, thus improve the exhaust gas temperature after gas turbine acting.Meanwhile, increase the feedwater flow of steam circuit so that it is obtain bigger quantity of steam with the flue gas heat exchange of the higher temperature of gas turbine discharge, make the steam of greater flow enter steam turbine acting.Steam now maintains original steam pressure and temperature is basically unchanged, and these more steam enters steam turbine acting and obtains bigger exerting oneself, and improves the efficiency of whole combustion and steam association system.Further, the high-temperature flue gas extracted in residual heat flue is discharged after being lowered the temperature preheating heat exchanger, reduces exhaust gas temperature, improves the thermal efficiency.On the other hand, preheating heat exchanger does not change the steam operational factor of steam circuit, it is not necessary to adopt the better material of heat resisting and pressure resisting, avoids being greatly improved the cost of whole system while improving the thermal efficiency.
Accompanying drawing explanation
Fig. 1 is the structural representation of the combustion and steam association system of this utility model embodiment.
Description of reference numerals:
100, gas turbine, 210, waste heat boiler, 211, residual heat flue, 212, waste heat chimney, 220, steam turbine, 230, condenser, 320, preheating heat exchanger, 330, flow control valve, 410, fuel heater, 420, flow control valve.
Detailed description of the invention
Below this utility model is described in further detail, but embodiment of the present utility model is not limited to this.
As it is shown in figure 1, combustion and steam association system includes: fuel unit, steam circuit and preheating heat exchanger 320, fuel unit includes gas turbine 100；Steam circuit is provided with waste heat boiler 210, steam turbine 220, is provided with residual heat flue 211 in waste heat boiler 210, and residual heat flue 211 is provided with bleeding point；Preheating heat exchanger 320 has the first heat exchanger channels and the second heat exchanger channels that cooperate；Wherein, residual heat flue 211 docks with the exhanst gas outlet of gas turbine 100, the import of the first heat exchanger channels is docked with bleeding point, the outlet of the first heat exchanger channels is fume emission mouth, the import of the second heat exchanger channels is docked with fuels sources or air source, and the outlet of the second heat exchanger channels is docked with fuel inlet or the air intlet of gas turbine 100.
Flue gas enters in the first heat exchanger channels of preheating heat exchanger 320, and heats the second heat exchanger channels fuel or air, and fuel or air after intensification enter gas turbine 100 work by combustion.Preheating heat exchanger makes fuel or air themperature raise, thus improve the exhaust gas temperature after gas turbine 100 acting.Meanwhile, increase the feedwater flow of steam circuit so that it is obtain bigger quantity of steam with the flue gas heat exchange of the higher temperature of gas turbine 100 discharge, make the steam of greater flow enter steam turbine 220 and do work.Steam now maintains original steam pressure and temperature is basically unchanged, and these more steam enters steam turbine 220 acting and obtains bigger exerting oneself, and improves the efficiency of whole combustion and steam association system.Further, the high-temperature flue gas extracted in residual heat flue 211 is discharged after being lowered the temperature preheating heat exchanger 320, reduces exhaust gas temperature, improves the thermal efficiency.On the other hand, fuel heater 410 does not change the steam operational factor of combustion and steam circulation, it is not necessary to adopt the better material of heat resisting and pressure resisting, avoids being greatly improved the cost of whole system while improving the thermal efficiency.The tail flue gas of waste heat boiler 210 is directly utilized, it is not necessary to intermediate heat transfer medium, and therefore utilization rate of waste heat increases, and used heat is by high efficiente callback.
Steam circuit is additionally provided with at least one-level steam circulation heat exchanger, steam circulation heat exchanger is installed in residual heat flue 211, on flow of flue gas direction in residual heat flue 211, bleeding point is positioned at the upstream of most end one-level steam circulation heat exchanger, or bleeding point is concordant with most end one-level steam circulation heat exchanger (has certain length generally in the flow direction of the flue gas due to steam circulation heat exchanger, the bleeding point any position that refer to bleeding point can be arranged on most end one-level steam circulation heat exchanger concordant with most end one-level steam circulation heat exchanger, but the downstream of most end one-level steam circulation heat exchanger must not be positioned at).In the present embodiment, steam circuit is additionally provided with condensation water heater, condensation water heater is installed in residual heat flue 211, and condensation water heater is the most end one-level steam circulation heat exchanger in residual heat flue 211, bleeding point is concordant with condensation water heater or is positioned at the upstream of condensation water heater, the Gas phase Smoke that this place is extracted is malleation for preheating heat exchanger, the outlet of residual heat flue 211 is additionally provided with waste heat chimney 212, waste heat chimney 212 is provided with gas returning port, the outlet of the first heat exchanger channels is docked with gas returning port, the pressure that flue gas enters waste heat chimney 212 from gas returning port after preheating heat exchanger is micro-more than the flue gas pressures after condensation water heater, flue gas is one-way flow between bleeding point-preheating heat exchanger 320-gas returning port under positive pressure, therefore preheating heat exchanger blower fan supercharging need not overcome SR to run to maintain system.Do not need the rotating machinerys such as blower fan to keep on the go, reduce the maintenance workload of equipment, also reduce operation station-service power consumption, further increase combined cycle efficiency.
Preferably, the flue-gas temperature entering preheating heat exchanger by bleeding point from residual heat flue 211 is 90 DEG C to 110 DEG C, and optimal value is 95 DEG C.When ensureing that flue gas institute can overcome the SR of preheating heat exchanger with pressure and not need the powered rotation booster apparatus arranging extra power consumption to drain into chimney voluntarily, it is ensured that flue gas possesses enough waste heats and is utilized, and improves the thermal efficiency of system.Preheating heat exchanger operational factor is low, it is only necessary to a preheating heat exchanger 320, and SR is little, and therefore system equipment cost is low.
Combustion and steam association system also includes fuel heater 410, and fuel heater 410 has the 3rd heat exchanger channels and the 4th heat exchanger channels that match；Steam circuit is additionally provided with condenser 230, pipeline from the pipeline of condenser 230 to waste heat boiler 210 or in waste heat boiler 210 is provided with pump mouth, and the pipeline from the pipeline of condenser 230 to waste heat boiler 210 or in waste heat boiler 210 is provided with water supplement port；Wherein, the import of the 3rd heat exchanger channels, outlet are docked with pump mouth, water supplement port respectively, and the import of the 4th heat exchanger channels is docked with the outlet of the second heat exchanger channels, and the outlet of the 4th heat exchanger channels is docked with the fuel inlet of gas turbine 100.In the present embodiment, the pipeline in waste heat boiler 210 is provided with pump mouth, is provided with water supplement port from the pipeline of condenser 230 to waste heat boiler 210, but is not limited to this, as required, it is also possible to pump mouth, water supplement port are arranged at other positions.
The part feedwater of steam circuit enters the 3rd heat exchanger channels of fuel heater 410 from pump mouth, through the pre-warmed fuel of preheating heat exchanger 320, (in the present embodiment, fuel flows through preheating heat exchanger, preheating heat exchanger is to fuel preheating, but it is not limited to this, hot-air can also be added) enter the 4th heat exchanger channels of fuel heater 410, fuel is reheated by feedwater in fuel heater 410, fuel heats up again, feedwater is lowered the temperature, feedwater after cooling is by water supplement port flowback steam closed circuit, then the fuel after intensification enters gas turbine 100.First to fuel preheating in preheating heat exchanger 320, again fuel is sent into and fuel heater 410 adopts the feedwater of steam circuit reheat, fuel is made to obtain higher temperature by two-step heating, and, the feedwater of the steam circuit for heating fuel in fuel heater can be reduced and make consumption, save high-grade energy.
Bleeding point and preheating heat exchanger 320 are provided with flow control valve 330, and flow control valve 330 can regulate the flue gas flow entering preheating heat exchanger from bleeding point.The air intlet of gas turbine 100 is provided with temperature sensor；Or, the fuel inlet of gas turbine 100 is provided with temperature sensor.In the present embodiment, fuel is preheated by preheating heat exchanger, fuel is carried out reheating by fuel heater 410, is provided with temperature sensor in fuel inlet.Combustion and steam association system also has controller, temperature sensor and flow control valve 330 are electrically connected with controller respectively, the air themperature of the entrance gas turbine 100 that controller detects according to temperature sensor or fuel temperature, regulate flow control valve 330, control to enter the flue gas flow of preheating heat exchanger from bleeding point, thus controlling the temperature of fuel or the air (for fuel in the present embodiment) entering in gas turbine 100.The temperature entering the fuel of gas turbine 100 is subject to the impact of ambient temperature, change with the change of ambient temperature, using the temperature of the fuel that enters gas turbine 100 as control signal, when the temperature value of the fuel that temperature sensor detects is more than setting value, controller controls flow control valve 330 and reduces the flue gas flow entering preheating heat exchanger 320, namely minimizing and fuel carry out the flue gas flow of heat exchange, make the heat that fuel obtains reduce, thus reducing fuel to enter the temperature of gas turbine 100；Otherwise, when the temperature value of the fuel that temperature sensor detects is less than setting value, controller controls flow control valve 330 and increases the flue gas flow entering preheating heat exchanger 320, namely increase and fuel carry out the flue gas flow of heat exchange, the heat that fuel obtains is made to increase, thus improving fuel to enter the temperature of gas turbine 100；So repeatedly regulate, the temperature finally making fuel reaches the set temperature value that Theoretical Calculation makes combustion and steam association system most effective, Combined cycle gas-steam turbine unit is made to obtain optimum efficiency, Combined cycle gas-steam turbine unit is under any season any operating mode, can both run with optimum state, do not affected by extraneous objective factor.It is not limited to this, flow control valve 420 can also be provided with by fuel heater, the feedwater flow entering fuel heater from pump mouth can be regulated, thus controlling the heat exchange amount of fuel heater 410, flow control valve 420 is regulated, it is possible to comprehensive regulation enters the fuel temperature of gas turbine 100 while regulating flow control valve 330.
It is not limited to the present embodiment, as required, it is also possible to being not provided with fuel heater, the fuel or air that enter gas turbine 100 are preheated by single employing preheating heat exchanger 320.
Combustion and steam association system progress control method, including:
A, fuel and air enter work by combustion in gas turbine 100, flue gas after acting enters the residual heat flue 211 of waste heat boiler 210, and the feedwater in waste heat boiler being heated, becomes high-temperature vapor after feedwater heating, steam enters steam turbine 220 and does work.
Preheating: the flue gas in the residual heat flue 211 of waste heat boiler 210 enters preheating heat exchanger by the bleeding point on residual heat flue 211, flue gas enters in the first heat exchanger channels of preheating heat exchanger 320, and heat the fuel in the second heat exchanger channels or air (for fuel in the present embodiment), fuel or air (for fuel in the present embodiment) after intensification enter gas turbine 100 work by combustion, flue gas is lowered the temperature, and the flue gas lowered the temperature is discharged from the outlet of the first heat exchanger channels.
Reheating: the part feedwater of steam circuit enters the 3rd heat exchanger channels of fuel heater 410 from pump mouth, the 4th heat exchanger channels of fuel heater 410 is entered through the pre-warmed fuel of preheating heat exchanger 320 or air (for fuel in the present embodiment), fuel is reheated by feedwater in fuel heater 410, fuel heats up again, feedwater is lowered the temperature, feedwater after cooling is by water supplement port flowback steam closed circuit, then fuel or the air (for fuel in the present embodiment) after intensification enters gas turbine 100.
The temperature of B, the temperature of the gas turbine 100 air intake place air detected according to temperature sensor or fuel inlet place fuel, regulate flow control valve 330, control to enter the flue gas flow of preheating heat exchanger in residual heat flue 211, thus controlling the temperature entering the fuel of gas turbine 100 or air (for fuel in the present embodiment)；Simultaneously, it is possible to regulate flow control valve 420, controlling to adjust the feedwater flow entering fuel heat exchangers from pump mouth, comprehensive regulation enters the fuel of gas turbine 100 or the temperature of air (being fuel in the present embodiment).
Each technical characteristic of above example can combine arbitrarily, for making description succinct, all possible combination of each technical characteristic in above-described embodiment is not all described, but, as long as the combination of these technical characteristics is absent from contradiction, all it is considered to be the scope that this specification is recorded.
Above example only have expressed several embodiments of the present utility model, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to utility model patent scope.It should be pointed out that, for the person of ordinary skill of the art, without departing from the concept of the premise utility, it is also possible to make some deformation and improvement, these broadly fall into protection domain of the present utility model.Therefore, the protection domain of this utility model patent should be as the criterion with claims.
Claims (7)
1. a combustion and steam association system, it is characterised in that including:
Fuel unit, described fuel unit includes gas turbine；
Steam circuit, described steam circuit is provided with waste heat boiler, steam turbine, is provided with residual heat flue in described waste heat boiler, and described residual heat flue is provided with bleeding point；
Preheating heat exchanger, described preheating heat exchanger has the first heat exchanger channels and the second heat exchanger channels that cooperate；
Wherein, described residual heat flue docks with the exhanst gas outlet of described gas turbine, the import of described first heat exchanger channels is docked with described bleeding point, the outlet of described first heat exchanger channels is fume emission mouth, the import of described second heat exchanger channels is docked with fuels sources or air source, and the outlet of described second heat exchanger channels is docked with fuel inlet or the air intlet of described gas turbine.
2. combustion and steam association system according to claim 1, it is characterised in that be provided with flow control valve between described bleeding point and described preheating heat exchanger.
3. combustion and steam association system according to claim 1, it is characterised in that the air intlet of described gas turbine is provided with temperature sensor；Or, the fuel inlet of described gas turbine is provided with temperature sensor.
4. combustion and steam association system according to claim 1, it is characterised in that the flue-gas temperature entering described preheating heat exchanger by described bleeding point from described residual heat flue is 90 DEG C to 110 DEG C.
5. combustion and steam association system according to claim 1, it is characterised in that also include fuel heater, described fuel heater has the 3rd heat exchanger channels and the 4th heat exchanger channels that match；
Described steam circuit is additionally provided with condenser, from described condenser, the pipeline to the pipeline of described waste heat boiler or in described waste heat boiler is provided with pump mouth, and from described condenser, the pipeline to the pipeline of described waste heat boiler or in described waste heat boiler is provided with water supplement port；
Wherein, the import of described 3rd heat exchanger channels, outlet are docked with described pump mouth, described water supplement port respectively, the import of described 4th heat exchanger channels is docked with the outlet of described second heat exchanger channels, and the outlet of described 4th heat exchanger channels is docked with the fuel inlet of described gas turbine.
6. combustion and steam association system according to claim 5, it is characterized in that, described steam circuit is additionally provided with at least one-level steam circulation heat exchanger, described steam circulation heat exchanger is installed in described residual heat flue, on flow of flue gas direction in described residual heat flue, described bleeding point is positioned at the upstream of most end one-level steam circulation heat exchanger or described bleeding point is concordant with most end one-level steam circulation heat exchanger.
7. combustion and steam association system according to claim 1, it is characterised in that the outlet of described residual heat flue is additionally provided with waste heat chimney, described waste heat chimney is provided with gas returning port, and the outlet of described first heat exchanger channels is docked with described gas returning port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521144229.9U CN205349443U (en) | 2015-12-31 | 2015-12-31 | Gas steam combination system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521144229.9U CN205349443U (en) | 2015-12-31 | 2015-12-31 | Gas steam combination system |
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| CN205349443U true CN205349443U (en) | 2016-06-29 |
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| CN201521144229.9U Active CN205349443U (en) | 2015-12-31 | 2015-12-31 | Gas steam combination system |
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| CN (1) | CN205349443U (en) |
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2015
- 2015-12-31 CN CN201521144229.9U patent/CN205349443U/en active Active
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