CN211853969U - Waste heat cascade utilization system for combined cycle power plant - Google Patents
Waste heat cascade utilization system for combined cycle power plant Download PDFInfo
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- CN211853969U CN211853969U CN202020279886.9U CN202020279886U CN211853969U CN 211853969 U CN211853969 U CN 211853969U CN 202020279886 U CN202020279886 U CN 202020279886U CN 211853969 U CN211853969 U CN 211853969U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The utility model discloses a waste heat cascade utilization system for a combined cycle power plant, which relates to the technical field of waste heat utilization, and comprises a low-pressure continuous blow-off pipe, a medium-pressure continuous blow-off pipe, a high-pressure continuous blow-off pipe, a premixer, an air inlet chamber, a first heat exchanger, a second heat exchanger, a gas compressor and a combustor; the first heat exchanger is positioned in the air inlet chamber, and an air inlet is formed in the air inlet chamber; the low-pressure continuous sewage discharge pipe is connected with the first heat exchanger, the air inlet chamber is connected with the air compressor, and the air compressor is connected with the combustor; the high-pressure continuous sewage discharge pipe and the medium-pressure continuous sewage discharge pipe are both connected with the premixer, the premixer is connected with the air inlet of the second heat exchanger, and the air outlet of the second heat exchanger is connected with the combustor. The beneficial effects of the utility model reside in that: the utility model discloses utilize the continuous blowdown of high-medium pressure steam pocket to heat for ambient air and natural gas respectively, realized the energy step utilization, energy utilization is high, does not consume any energy, realizes unit energy saving and emission reduction.
Description
Technical Field
The utility model relates to a waste heat utilization technology field, concretely relates to waste heat step utilization system for combined cycle power plant.
Background
When the temperature is low and the humidity is high, water vapor in the air is in a state of ice-water mixture, so that the rotatable guide vane of the air compressor is frozen, the combustion engine is tripped, and even surging is caused. And the ice on the inlet guide vane can cause the damage of the blades of the compressor once falling off and entering the compressor. Therefore, the gas turbine has strict limitation on the temperature of the air at the inlet of the compressor during operation so as to protect the safe and stable operation of the compressor.
The combustion engine needs to require that the inlet natural gas temperature be at least a certain temperature, however, under some conditions, the natural gas temperature may not meet the specified requirements, so that the natural gas needs to be heated. Meanwhile, the efficiency of the combustion engine can be improved by heating natural gas.
At present, a mature technology is that a path of compressed air is led from an outlet of a gas compressor to an inlet of an air inlet system to heat air entering the air inlet system, but the heating mode not only influences the air quantity entering a combustion engine, but also reduces the efficiency of the combustion engine, and meanwhile, a heating pipe is needed when a dehumidifying device is started.
The continuous sewage discharge water of the high, medium and low pressure steam drums of the waste heat boiler is large in quantity and high in temperature, and if the patent CN209876889U discloses a waste heat utilization system for continuous sewage discharge of the steam drums of the waste heat boiler, the steam drums are firstly continuously discharged to a continuous discharge flash tank, and then natural gas at the outlet of a pressure regulating station is heated through a heat exchanger from a water outlet of the continuous discharge flash tank.
However, in the prior art, the continuous blowdown of the steam drum is firstly discharged to the continuous blowdown flash tank, on one hand, the continuous blowdown of the steam drum is bound to reduce the temperature and pressure, so that the waste of heat is caused, then the natural gas is heated, and the energy utilization rate is high without the continuous blowdown of the steam drum and direct heating. On the other hand, if the steam pocket discharges the sewage continuously and discharges the sewage to the continuous discharge expansion tank, only one heating pipeline can be led out to heat the natural gas.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that the heat utilization rate of the continuous blowdown water waste heat utilization system of current exhaust-heat boiler steam pocket is lower, provide a waste heat step utilization system for combined cycle power plant.
The utility model discloses a following technical means realizes solving above-mentioned technical problem:
the utility model provides a waste heat cascade utilization system for a combined cycle power plant, which comprises a low-pressure continuous blow-off pipe, a medium-pressure continuous blow-off pipe, a high-pressure continuous blow-off pipe, a premixer, an air inlet chamber, a first heat exchanger, a second heat exchanger, a compressor and a combustor; the first heat exchanger is positioned in the air inlet chamber, and an air inlet is formed in the air inlet chamber;
the low-pressure continuous sewage discharge pipe is connected with the first heat exchanger, the air inlet chamber is connected with the air compressor, and the air compressor is connected with the combustor; the high-pressure continuous sewage draining pipe and the medium-pressure continuous sewage draining pipe are both connected with the premixer, the premixer is connected with the air inlet of the second heat exchanger, and the air outlet of the second heat exchanger is connected with the combustor.
The working principle is as follows: a high-pressure continuous blow-off pipe is led out from the high-pressure steam drum for continuous blow-off, a medium-pressure continuous blow-off pipe is led out from the medium-pressure steam drum for continuous blow-off, and a low-pressure continuous blow-off pipe is led out from the low-pressure steam drum for continuous blow-off;
the low-pressure steam pocket continuously drains water, the water is introduced into the first heat exchanger from the low-pressure continuous drainage pipe, air enters the air inlet chamber from the air inlet, the air is introduced into the air compressor from the air inlet chamber after being subjected to heat exchange and temperature rise through the first heat exchanger, and the heated air is introduced into the combustor through the air compressor;
the continuous sewage draining water of the medium-pressure steam drum is introduced into the premixer from the medium-pressure continuous sewage draining pipe, and the continuous sewage draining water of the high-pressure steam drum is introduced into the premixer from the high-pressure continuous sewage draining pipe and then introduced into the second heat exchanger from the premixer; and natural gas enters from the gas inlet of the second heat exchanger, is subjected to heat exchange and temperature rise through the second heat exchanger, and then is introduced into the combustor from the gas outlet of the second heat exchanger.
Has the advantages that: the utility model adopts the mode of energy cascade utilization, and leads out a heating pipeline from the continuous sewage discharge of the high, medium and low pressure steam drums, because the temperature required by natural gas heating is higher, the natural gas is heated by adopting the energy with higher heat level (the continuous sewage discharge of the high and medium pressure steam drums is mixed), and because the temperature of the natural gas is raised, the efficiency of the combined cycle unit can be improved; the low-heat energy (low-pressure steam drum continuous blowdown) is adopted to heat the ambient air, and the ambient air is heated to a temperature close to a design value, so that the effects of dehumidification and deicing are achieved.
The utility model discloses utilize the continuous blowdown of high-medium pressure steam pocket to heat for ambient air and natural gas respectively, realized that the energy step utilizes, energy utilization is high, does not consume any energy, realizes unit energy saving and emission reduction, and the energy of production can be used to power plant cyclic power generation, simultaneously the utility model discloses simple structure, easily production popularization.
Preferably, a first valve is arranged on the low-pressure continuous sewage discharge pipe, a second valve is arranged on the medium-pressure continuous sewage discharge pipe, and a third valve is arranged on the high-pressure continuous sewage discharge pipe.
Preferably, the number of the first valve, the second valve and the third valve is three.
Preferably, the waste heat cascade utilization system for the combined cycle power plant further comprises a continuous discharge flash tank, a first pipeline, a second pipeline and a third pipeline;
one end of the first pipeline is connected with the low-pressure continuous sewage discharge pipe, the other end of the first pipeline is connected with the continuous discharge flash tank, and the first valve is positioned between the first pipeline and the first heat exchanger;
one end of the second pipeline is connected with the medium-pressure continuous sewage pipe, the other end of the second pipeline is connected with the continuous drainage flash tank, and the second valve is positioned between the second pipeline and the premixer;
one end of the third pipeline is connected with the high-pressure continuous sewage discharge pipe, the other end of the third pipeline is connected with the continuous-exhaust flash tank, and the third valve is located between the third pipeline and the premixer.
Has the advantages that: when the first heat exchanger and the second heat exchanger are overhauled, the first valve, the second valve and the third valve are closed, and high-pressure, medium-pressure and low-pressure steam drums continuously discharge sewage to the continuous discharge flash tank.
Preferably, the other end of the first pipeline is connected with a water inlet of the continuous-row flash tank, the other end of the second pipeline is connected with a water inlet of the continuous-row flash tank, and the other end of the third pipeline is connected with a water inlet of the continuous-row flash tank.
Preferably, a fourth valve is arranged on the first pipeline, a fifth valve is arranged on the second pipeline, and a sixth valve is arranged on the third pipeline.
Preferably, a filter screen is arranged in the air inlet chamber and arranged along the air circulation track, so that air enters the air compressor after passing through the filter screen.
Preferably, the water inlet of the first heat exchanger is connected with a low-pressure continuous sewage discharge pipe, and the water outlet of the first heat exchanger is connected with a condenser.
Preferably, a water inlet of the second heat exchanger is connected with a water outlet of the premixer through a fourth pipeline, and a water outlet of the second heat exchanger is connected with the condenser.
Has the advantages that: after the waste heat of the high, medium and low pressure steam drum sewage is utilized, the waste heat can be recovered to a condenser for continuous utilization.
Preferably, a seventh valve is arranged on the fourth pipeline.
Preferably, the first heat exchanger is a first shell-and-tube heat exchanger, and the second heat exchanger is a second shell-and-tube heat exchanger.
The utility model discloses a theory of operation: a high-pressure continuous blow-off pipe is led out from the high-pressure steam drum for continuous blow-off, a medium-pressure continuous blow-off pipe is led out from the medium-pressure steam drum for continuous blow-off, and a low-pressure continuous blow-off pipe is led out from the low-pressure steam drum for continuous blow-off;
the low-pressure steam pocket continuously drains water, the water is introduced into the first heat exchanger from the low-pressure continuous drainage pipe, air enters the air inlet chamber from the air inlet, the air is introduced into the air compressor from the air inlet chamber after being subjected to heat exchange and temperature rise through the first heat exchanger, and the heated air is introduced into the combustor through the air compressor;
the continuous sewage draining water of the medium-pressure steam drum is introduced into the premixer from the medium-pressure continuous sewage draining pipe, and the continuous sewage draining water of the high-pressure steam drum is introduced into the premixer from the high-pressure continuous sewage draining pipe and then introduced into the second heat exchanger from the premixer; and natural gas enters from the gas inlet of the second heat exchanger, is subjected to heat exchange and temperature rise through the second heat exchanger, and then is introduced into the combustor from the gas outlet of the second heat exchanger.
The utility model has the advantages that: the utility model adopts the mode of energy cascade utilization, and a heating pipeline is respectively led out from the continuous sewage drainage of the high and medium pressure steam pocket, because the temperature required by natural gas heating is higher, the natural gas is heated by adopting the energy with higher heat level (the continuous sewage drainage of the high and medium pressure steam pocket is mixed), and because the temperature of the natural gas is raised, the efficiency of the combined cycle unit can be improved; the low-heat energy (low-pressure steam drum continuous blowdown) is adopted to heat the ambient air, and the ambient air is heated to a temperature close to a design value, so that the effects of dehumidification and deicing are achieved.
The utility model discloses utilize the continuous blowdown of high-and-medium pressure steam pocket to heat for ambient air and natural gas respectively, realized that the energy step utilizes, energy utilization is high, does not consume any energy, can be used to the combined cycle power plant, realizes unit energy saving and emission reduction, simultaneously the utility model discloses simple structure, easily production is promoted.
Drawings
Fig. 1 is a schematic structural diagram of a waste heat cascade utilization system for a combined cycle power plant in embodiment 1 of the present invention;
fig. 2 is a schematic structural diagram of a waste heat cascade utilization system for a combined cycle power plant according to embodiment 2 of the present invention;
in the figure: a low-pressure continuous sewage discharge pipe 11; a first valve 12; an intake chamber 13; a first heat exchanger 14; a compressor 15; a medium pressure continuous sewage pipe 21; a second valve 22; a high pressure continuous sewage pipe 31; a third valve 32; a premixer 41; a second heat exchanger 42; a burner 43; a first duct 51; a fourth valve 52; a second conduit 53; a fifth valve 54; a third conduit 55; a sixth valve 56; a bank flash tank 61; a fourth pipe 62; a fifth pipe 63; a sixth conduit 64; a seventh valve 65; a screen 66.
Detailed Description
To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the embodiments of the present invention are combined to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
It is noted that, in this document, relational terms such as first and second, and the like, if any, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Example 1
A waste heat cascade utilization system for a combined cycle power plant is shown in figure 1 and comprises a low-pressure continuous sewage pipe 11, a medium-pressure continuous sewage pipe 21, a high-pressure continuous sewage pipe 31, a premixer 41, an air inlet chamber 13, a first heat exchanger 14, a second heat exchanger 42, a compressor 15 and a combustor 43.
A first valve 12 is arranged on the low-pressure continuous sewage pipe 11, a second valve 22 is arranged on the medium-pressure continuous sewage pipe 21, a third valve 32 is arranged on the high-pressure continuous sewage pipe 31, and the installation mode of the valves is the prior art;
the premixer 41 is provided with a water inlet and a water outlet; first heat exchanger 14 is installed in air inlet chamber 13, is equipped with air inlet and air outlet on the air inlet chamber 13, for the heated scope of increase air, and air inlet and air outlet set up along first heat exchanger 14's axis relatively in this embodiment, and first heat exchanger 14 is first shell and tube type heat exchanger in this embodiment.
The second heat exchanger 42 is provided with an air inlet and an air outlet, and the second heat exchanger 42 is a second shell-and-tube heat exchanger in this embodiment.
One end of the low-pressure continuous sewage discharge pipe 11 is connected with a continuous sewage discharge port of the low-pressure steam drum, the other end of the low-pressure continuous sewage discharge pipe 11 penetrates through the air inlet chamber 13, and the other end of the low-pressure continuous sewage discharge pipe 11 is connected with a water inlet of the first heat exchanger 14.
One end of the medium-pressure continuous sewage draining pipe 21 is connected with the medium-pressure continuous sewage draining port, and the other end of the medium-pressure continuous sewage draining pipe 21 is connected with the water inlet of the premixer 41; one end of the high-pressure continuous sewage discharge pipe 31 is connected with a continuous sewage discharge port of the high-pressure steam drum, and the other end of the high-pressure continuous sewage discharge pipe 31 is connected with a water inlet of the premixer 41; the water outlet of the premixer 41 is connected with the water inlet of the second heat exchanger 42, and the air outlet of the second heat exchanger 42 is connected with the air inlet of the burner 43.
The working principle of the embodiment is as follows: opening a first valve 12, a second valve 22 and a third valve 32, wherein the low-pressure steam pocket continuous sewage is introduced into the first heat exchanger 14 from a low-pressure continuous sewage pipe 11, the medium-pressure steam pocket continuous sewage is introduced into the premixer 41 from a medium-pressure continuous sewage pipe 21, and the high-pressure steam pocket continuous sewage is introduced into the premixer 41 from a high-pressure continuous sewage pipe 31 and then introduced into the second heat exchanger 42 from the premixer 41;
air enters the air inlet chamber 13 from the air inlet, is subjected to heat exchange and temperature rise through the first heat exchanger 14, then is introduced into the air compressor 15 from the air inlet chamber 13, and the heated air is introduced into the combustor 43 through the air compressor 15;
after entering the heat exchange tube of the second heat exchanger 42 from the air inlet of the second heat exchanger 42 for heat exchange and temperature rise, the natural gas is introduced into the burner 43 from the air outlet of the second heat exchanger 42. The arrows in fig. 1 indicate the air flow direction and the natural gas flow direction, respectively.
The beneficial effects of the embodiment are that: the system in the embodiment adopts a mode of energy gradient utilization, a heating pipeline is respectively led out from the continuous sewage drained from the high-pressure steam drum, the medium-pressure steam drum and the low-pressure steam drum, because the temperature required by heating the natural gas is higher, the natural gas is heated by adopting higher-heat-level energy (the continuous sewage drainage of the high-pressure steam drum and the medium-pressure steam drum is mixed), and because the temperature of the natural gas is increased, the efficiency of the combined cycle unit can be improved; the low-heat energy (low-pressure steam drum continuous blowdown) is adopted to heat the ambient air, and the ambient air is heated to a temperature close to a design value, so that the effects of dehumidification and deicing are achieved.
This embodiment utilizes the continuous blowdown of high-and-medium pressure steam pocket to heat for ambient air and natural gas respectively, has realized the energy cascade utilization, and energy utilization is high, does not consume any energy, realizes unit energy saving and emission reduction, simultaneously the utility model discloses simple structure, easily production popularization.
Example 2
This embodiment is different from embodiment 1 in that: as shown in fig. 2, the system further includes a continuous discharge flash tank 61, a condenser (not shown), a first pipeline 51, a second pipeline 53, a third pipeline 55, a fourth pipeline 62, a fifth pipeline 63, a sixth pipeline 64, a fourth valve 52, a fifth valve 54, a sixth valve 56, a seventh valve 65, an air inlet grille, and a filter screen 66, wherein arrows in fig. 2 respectively indicate a water flow direction, an air flow direction, and a natural gas flow direction.
One end of the first pipeline 51 is connected with the low-pressure continuous sewage pipe 11, the other end of the first pipeline 51 is connected with a water inlet of the continuous discharge flash tank 61, the first valve 12 is positioned between the first pipeline 51 and the first heat exchanger 14, the fourth valve 52 is installed on the first pipeline 51, and the installation mode of the valves is the prior art.
One end of the second pipeline 53 is connected with the medium-pressure continuous sewage pipe 21, the other end of the second pipeline 53 is connected with the water inlet of the continuous discharge flash tank 61, the second valve 22 is positioned between the second pipeline 53 and the premixer 41, the fifth valve 54 is installed on the second pipeline 53, and the installation mode of the valves is the prior art.
One end of a third pipeline 55 is connected with the high-pressure continuous sewage pipe 31, the other end of the third pipeline 55 is connected with a water inlet of the continuous discharge flash tank 61, a third valve 32 is positioned between the third pipeline 55 and the premixer 41, a sixth valve 56 is installed on the third pipeline 55, and the installation mode of the valves is the prior art.
One end of the fourth pipeline 62 is connected to the water outlet of the premixer 41, the other end of the fourth pipeline 62 is connected to the water inlet of the second heat exchanger 42, and a seventh valve 65 is installed on the fourth pipeline 62, and the installation manner of the valve is the prior art.
One end of the fifth pipeline 63 is connected with the air outlet, and the other end of the fifth pipeline 63 is connected with the burner 43; one end of the sixth pipeline 64 is connected to the air outlet, and the other end of the sixth pipeline 64 is connected to the air inlet of the compressor 15.
The water inlet of the condenser is connected with the water outlet of the first heat exchanger 14, the water inlet of the condenser is connected with the water outlet of the second heat exchanger 42, and the water outlet of the first heat exchanger 14 and the water outlet of the second heat exchanger 42 are connected with the same condenser.
Air inlet grille installs in air inlet department, and filter screen 66 installs in air inlet chamber 13, and the number of filter screen 66, the filtration pore size of filter screen 66 set up according to actual need, and the lateral wall of filter screen 66 and the inner wall fixed connection of air inlet chamber 13, and filter screen 66 are located between first heat exchanger 14 and the air outlet, and the air gets into air inlet chamber 13 through air inlet grille, through first heat exchanger 14 heat transfer after, through filter screen 66, then from the air outlet discharge.
In this embodiment, the number of the first valves 12, the second valves 22, and the third valves 32 is three, and the number of the fourth valves 52, the fifth valves 54, the sixth valves 56, and the seventh valves 65 is two, wherein one of the three first valves 12 is an electrically operated regulating valve, one of the three second valves 22 is an electrically operated regulating valve, one of the three third valves 32 is an electrically operated regulating valve, one of the two fifth valves 54 is an electrically operated regulating valve, one of the two sixth valves 56 is an electrically operated regulating valve, and one of the two seventh valves 65 is an electrically operated regulating valve.
By opening the first valve 12, the second valve 22, the third valve 32, the fourth valve 52, the fifth valve 54, the sixth valve 56 and the seventh valve 65, the electric adjusting valves enable the high-pressure steam drum and the medium-pressure steam drum to continuously discharge sewage and enter the premixer 41 for premixing, the premixed hot water enters the second heat exchanger 42 to heat natural gas, and the heat-exchanged hot water is discharged into the condenser for continuous utilization.
According to the inlet air temperature value, the flow of heat exchange hot water entering the first heat exchanger 14 is adjusted through an electric adjusting valve on the low-pressure continuous sewage discharge pipe 11, and the hot water after heat exchange is discharged into a condenser to be continuously utilized.
The working principle of the embodiment is as follows: when the first heat exchanger 14 and the second heat exchanger 42 need to be overhauled, the first valve 12, the second valve 22 and the third valve 32 are closed, the fourth valve 52, the fifth valve 54 and the sixth valve 56 are opened, and the high-pressure, medium-pressure and low-pressure steam drums are continuously drained to the continuous drainage flash tank 61.
The hot water after the heat exchange of the first heat exchanger 14 is discharged into the condenser, and the hot water after the heat exchange of the second heat exchanger 42 is discharged into the condenser.
The beneficial effects of this embodiment: the continuous-row flash tank 61 is arranged, so that the first heat exchanger 14 and the second heat exchanger 42 can be conveniently used during maintenance; by arranging a plurality of valves, when one valve is damaged, other valves can be used; a screen 66 is provided to filter the heated air.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (10)
1. A waste heat cascade utilization system for a combined cycle power plant, characterized by: the device comprises a low-pressure continuous sewage discharge pipe, a medium-pressure continuous sewage discharge pipe, a high-pressure continuous sewage discharge pipe, a premixer, an air inlet chamber, a first heat exchanger, a second heat exchanger, a gas compressor and a combustor; the first heat exchanger is positioned in the air inlet chamber, and an air inlet is formed in the air inlet chamber;
the low-pressure continuous sewage discharge pipe is connected with the first heat exchanger, the air inlet chamber is connected with the air compressor, and the air compressor is connected with the combustor; the high-pressure continuous sewage draining pipe and the medium-pressure continuous sewage draining pipe are both connected with the premixer, the premixer is connected with the air inlet of the second heat exchanger, and the air outlet of the second heat exchanger is connected with the combustor.
2. The waste heat cascade utilization system for a combined cycle power plant of claim 1, wherein: the low-pressure continuous sewage discharge pipe is provided with a first valve, the medium-pressure continuous sewage discharge pipe is provided with a second valve, and the high-pressure continuous sewage discharge pipe is provided with a third valve.
3. The waste heat cascade utilization system for a combined cycle power plant of claim 2, wherein: the number of the first valve, the second valve and the third valve is three.
4. The waste heat cascade utilization system for a combined cycle power plant of claim 2, wherein: the waste heat cascade utilization system for the combined cycle power plant further comprises a continuous discharge flash tank, a first pipeline, a second pipeline and a third pipeline;
one end of the first pipeline is connected with the low-pressure continuous sewage discharge pipe, the other end of the first pipeline is connected with the continuous discharge flash tank, and the first valve is positioned between the first pipeline and the first heat exchanger;
one end of the second pipeline is connected with the medium-pressure continuous sewage pipe, the other end of the second pipeline is connected with the continuous drainage flash tank, and the second valve is positioned between the second pipeline and the premixer;
one end of the third pipeline is connected with the high-pressure continuous sewage discharge pipe, the other end of the third pipeline is connected with the continuous-exhaust flash tank, and the third valve is located between the third pipeline and the premixer.
5. The waste heat cascade utilization system for a combined cycle power plant of claim 4, wherein: the other end of the first pipeline is connected with a water inlet of the continuous-row flash tank, the other end of the second pipeline is connected with a water inlet of the continuous-row flash tank, and the other end of the third pipeline is connected with a water inlet of the continuous-row flash tank.
6. The waste heat cascade utilization system for a combined cycle power plant of claim 4, wherein: and a fourth valve is arranged on the first pipeline, a fifth valve is arranged on the second pipeline, and a sixth valve is arranged on the third pipeline.
7. The waste heat cascade utilization system for a combined cycle power plant of claim 1, wherein: the air inlet chamber is internally provided with a filter screen which is arranged along the air circulation track, so that air enters the air compressor after passing through the filter screen.
8. The waste heat cascade utilization system for a combined cycle power plant of claim 1, wherein: the waste heat cascade utilization system for the combined cycle power plant further comprises a condenser, a water inlet of the first heat exchanger is connected with the low-pressure continuous sewage discharge pipe, and a water outlet of the first heat exchanger is connected with the condenser.
9. The waste heat cascade utilization system for a combined cycle power plant of claim 1, wherein: and a water inlet of the second heat exchanger is connected with a water outlet of the premixer through a fourth pipeline, and a water outlet of the second heat exchanger is connected with the condenser.
10. The waste heat cascade utilization system for a combined cycle power plant of claim 9, wherein: and a seventh valve is arranged on the fourth pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020279886.9U CN211853969U (en) | 2020-03-09 | 2020-03-09 | Waste heat cascade utilization system for combined cycle power plant |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020279886.9U CN211853969U (en) | 2020-03-09 | 2020-03-09 | Waste heat cascade utilization system for combined cycle power plant |
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| CN211853969U true CN211853969U (en) | 2020-11-03 |
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| CN202020279886.9U Active CN211853969U (en) | 2020-03-09 | 2020-03-09 | Waste heat cascade utilization system for combined cycle power plant |
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