CN210152743U - Gas-steam combined cycle power generation waste heat utilization system - Google Patents
Gas-steam combined cycle power generation waste heat utilization system Download PDFInfo
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- CN210152743U CN210152743U CN201921148037.3U CN201921148037U CN210152743U CN 210152743 U CN210152743 U CN 210152743U CN 201921148037 U CN201921148037 U CN 201921148037U CN 210152743 U CN210152743 U CN 210152743U
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Abstract
The utility model belongs to the technical field of power generation facility, a gas-steam combined cycle electricity generation waste heat utilization system is disclosed. The flue gas outlet pipeline of the gas turbine unit of the utility model is communicated with the flue gas inlet of the waste heat boiler; a steam outlet pipeline of the waste heat boiler is communicated with a steam inlet pipeline of the steam turbine; a first heat exchanger is arranged on an air inlet pipeline of the gas turbine, and a heating gas inlet of the first heat exchanger is communicated with a flue gas outlet pipeline of the waste heat boiler; the tail part of the waste heat boiler is provided with a hot water heat exchanger, the high-temperature hot water output end of the hot water heat exchanger is connected with the high-temperature hot water input end of the refrigerator, and the low-temperature hot water output end of the refrigerator is connected with the low-temperature hot water input end of the hot water heat exchanger. The utility model realizes the purpose of heating the fuel gas by utilizing the waste heat of the flue gas of the waste heat boiler, reducing the exhaust gas temperature of the waste heat boiler and increasing the output of the steam turbine; and a gas-steam combined cycle power generation waste heat utilization loop is formed, so that the power generation waste heat is fully utilized, and the method is suitable for popularization.
Description
Technical Field
The utility model belongs to the technical field of power generation facility, concretely relates to gas-steam combined cycle electricity generation waste heat utilization system.
Background
The gas-steam combined cycle power generation technology is a power generation technology for realizing high-efficiency power generation by organically combining a top layer gas turbine power generation cycle and a bottom layer steam Rankine power generation cycle. The gas-steam combined cycle generator set has the advantages of high efficiency, low consumption, quick start, flexible adjustment, high availability ratio, investment saving, short construction period, small environmental pollution and the like, and is increasingly valued and developed in foreign electric power industry at present.
Therefore, the gas-steam combined cycle power generation is an important form of high-efficiency power generation in the future. However, in the existing gas-steam combined cycle, the smoke discharge temperature of the single-pressure waste heat boiler is about 160-. For almost sulfur-free natural gas, the dew point temperature of the smoke is about 43-53 ℃, and the low-temperature corrosion of the heating surface of the smoke discharging section can be avoided only by keeping the smoke discharging temperature higher than the dew point by 10 ℃ in principle. Therefore, a larger waste heat utilization space still exists.
In addition, in the gas-steam combined cycle, an air compressor of a top-layer gas turbine power generation cycle is a high-power consumption device, and the power consumption of the air compressor is obviously influenced by the state of inlet air. According to literature data, the power generation efficiency can be improved by 1.5-2.0 percentage points when the inlet air of the combustion engine is reduced from 30 ℃ to 15 ℃.
Therefore, in the gas and steam combined cycle, the air inlet end in front of the air compressor and the smoke exhaust end behind the waste heat boiler have the potential of energy conservation and consumption reduction. At present, a great deal of effort is also made by various national scholars, aiming at further realizing the energy conservation and consumption reduction of the gas-steam combined cycle, improving the generating efficiency of the unit and obtaining certain achievements. Such as: 1) steam reinjection type gas turbine waste heat utilization: the method is characterized in that exhaust waste heat of a simple cycle gas turbine is utilized to generate superheated steam, the superheated steam is injected back into the gas turbine, and the superheated steam and a first working medium represented by air participate in cycle work together. Small equipment and low investment. The device is mainly used for a main power device of novel propulsion power of an aircraft carrier and the like. 2) The waste heat of the annular water in the gas turbine heats the inlet air. It features that the low-temp waste heat of cooling water of various equipments is recovered, the gas is preheated and its efficiency is raised. The investment is less, and the efficiency is improved generally. At present, the application is less. 3) The heat conducting oil recovers the waste heat of the gas turbine. The method is characterized in that the method is used for a natural gas cryogenic primary processing system, the stable crude oil is heated by the waste heat of the flue gas, and the energy-saving effect is obvious. The application range is greatly limited. It is used in oil and gas fields. However, the waste heat utilization technology does not realize comprehensive utilization of waste heat of the gas-steam combined cycle unit, and the efficiency improvement is limited.
If the waste heat utilization of the gas-steam combined cycle can be realized, the temperature of air at the inlet of the air compressor is reduced while the waste heat of the flue gas is recovered, the consumption of the air compressor is reduced, and the power generation efficiency of the gas-steam combined cycle can be obviously improved. However, research on waste heat refrigeration and air intake of the gas and steam combined cycle unit is relatively few at home and abroad at present, and researches on waste heat recovery and air compressor consumption reduction through comprehensive utilization of waste heat of the gas and steam combined cycle unit are more recent. Therefore, a lot of original work is also required.
In order to solve the problems, an authorized patent with the application number of CN201821266114.0 provides a solution, but the method needs to utilize a bottom steam power generation system such as a three-stage cylinder and a carbon dioxide heat pump waste heat utilization system, and has a relatively complex structure and high cost, and is not beneficial to popularization of the system.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems existing in the prior art, the utility model aims to provide a gas-steam combined cycle power generation waste heat utilization system. The utility model has relatively simple structure and low cost, the first heat exchanger heats the gas which passes through the first heat exchanger by the smoke gas which is exhausted by the waste heat boiler, thereby realizing the purpose of heating the gas by the waste heat of the smoke gas of the waste heat boiler, reducing the smoke exhaust temperature of the waste heat boiler and increasing the output of the steam turbine; the tail part of the waste heat boiler is provided with the hot water heat exchanger, high-temperature hot water from the hot water heat exchanger enters the refrigerator to be used as a heat source of the refrigerator, and then returns to the hot water heat exchanger at the tail part of the waste heat boiler again to form a gas-steam combined cycle power generation waste heat utilization loop, so that the power generation waste heat is fully utilized, and the waste heat utilization system is suitable for popularization.
The utility model discloses the technical scheme who adopts does:
a gas-steam combined cycle power generation waste heat utilization system comprises a gas turbine set, a steam turbine, a refrigerator and a waste heat boiler, wherein a flue gas outlet pipeline of the gas turbine set is communicated with a flue gas inlet of the waste heat boiler; the steam outlet pipeline of the waste heat boiler is communicated with the steam inlet pipeline of the steam turbine; a first heat exchanger is arranged on an air inlet pipeline of the gas turbine, and a heating air inlet of the first heat exchanger is communicated with a flue gas outlet pipeline of the waste heat boiler; the tail part of the waste heat boiler is provided with a hot water heat exchanger, the high-temperature hot water output end of the hot water heat exchanger is connected with the high-temperature hot water input end of the refrigerator, and the low-temperature hot water output end of the refrigerator is connected with the low-temperature hot water input end of the hot water heat exchanger, so that a gas-steam combined cycle power generation waste heat utilization loop is formed.
Preferably, the gas turbine set comprises a gas compressor, a combustion chamber and a gas turbine which are sequentially communicated, and a flue gas outlet pipeline of the gas turbine is communicated with a flue gas inlet of the waste heat boiler.
It is further preferred that the natural gas input line of the combustion chamber is externally connected with natural gas.
It is further preferred that the first heat exchanger is disposed outside the natural gas feed line to the combustion chamber.
Still more preferably, a hot water booster pump is arranged at the connection between the low-temperature hot water output end of the refrigerator and the low-temperature hot water input end of the hot water heat exchanger.
Still more preferably, the chilled water output end of the refrigerator is connected with the chilled water input end of the first heat exchanger.
The utility model has the advantages that:
the utility model has relatively simple structure and low cost, the first heat exchanger heats the gas which passes through the first heat exchanger by the smoke gas which is exhausted by the waste heat boiler, thereby realizing the purpose of heating the gas by the waste heat of the smoke gas of the waste heat boiler, reducing the smoke exhaust temperature of the waste heat boiler and increasing the output of the steam turbine; the tail part of the waste heat boiler is provided with the hot water heat exchanger, high-temperature hot water from the hot water heat exchanger enters the refrigerator to be used as a heat source of the refrigerator, and then returns to the hot water heat exchanger at the tail part of the waste heat boiler again to form a gas-steam combined cycle power generation waste heat utilization loop, so that the power generation waste heat is fully utilized, and the waste heat utilization system is suitable for popularization.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
In the figure: 1-a gas turbine unit; 11-a compressor; 12-a combustion chamber; 13-a gas turbine; 2-a steam turbine; 3-a refrigerator; 4, a waste heat boiler; 5-a first heat exchanger; 6-hot water heat exchanger; 7-hot water booster pump; 8-natural gas is externally connected.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be briefly described below with reference to the accompanying drawings and the description of the embodiments or the prior art, and it is obvious that the following description of the structure of the accompanying drawings is only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without any inventive work.
The technical solution provided by the present invention will be described in detail by way of embodiments with reference to the accompanying drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto.
In some instances, some embodiments are not described or not in detail, as they are conventional or customary in the art.
Furthermore, the technical features described herein, or the steps of all methods or processes disclosed, may be combined in any suitable manner in one or more embodiments, in addition to the mutually exclusive features and/or steps. It will be readily appreciated by those of skill in the art that the order of the steps or operations of the methods associated with the embodiments provided herein may be varied. Any order in the drawings and examples is for illustrative purposes only and does not imply that a certain order is required unless explicitly stated to be required.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The terms "connected" and "coupled" when used in this application, encompass both direct and indirect connections (and couplings) where appropriate and where not necessary contradictory.
The first embodiment is as follows:
as shown in fig. 1, the gas-steam combined cycle power generation waste heat utilization system of the present embodiment includes a gas turbine set 1, a steam turbine 2, a refrigerator 3 and a waste heat boiler 4, where the waste heat boiler 4 is used for heating by using flue gas discharged from the gas turbine set 1 to form steam, and a flue gas outlet pipe of the gas turbine set 1 is communicated with a flue gas inlet of the waste heat boiler 4; the steam outlet pipeline of the waste heat boiler 4 is communicated with the steam inlet pipeline of the steam turbine 2; a first heat exchanger 5 is arranged on an air inlet pipeline of the gas turbine unit 1, and a heating gas inlet of the first heat exchanger 5 is communicated with a flue gas outlet pipeline of the waste heat boiler 4 so as to heat the fuel gas passing through the first heat exchanger 5 through the flue gas discharged by the waste heat boiler 2; the tail part of the waste heat boiler 4 is provided with a hot water heat exchanger 6, high-temperature hot water from the hot water heat exchanger 6 enters the refrigerator and serves as a heat source of the refrigerator, the high-temperature hot water output end of the hot water heat exchanger 6 is connected with the high-temperature hot water input end of the refrigerator 3, and the low-temperature hot water output end of the refrigerator 3 is connected with the low-temperature hot water input end of the hot water heat exchanger 6, so that a fuel gas-steam combined cycle power generation waste.
The utility model has relatively simple structure and low cost, the first heat exchanger 5 heats the gas passing through the first heat exchanger 5 by the smoke discharged by the waste heat boiler 4, thereby realizing the purpose of heating the gas by the waste heat of the smoke of the waste heat boiler 4, reducing the smoke discharging temperature of the waste heat boiler 4 and increasing the output of the steam turbine 2; the tail part of the waste heat boiler 4 is provided with the hot water heat exchanger 6, high-temperature hot water from the hot water heat exchanger 6 enters the refrigerator 3 to be used as a heat source of the refrigerator 3, and then returns to the hot water heat exchanger at the tail part of the waste heat boiler again to form a gas-steam combined cycle power generation waste heat utilization loop, so that the power generation waste heat is fully utilized, and the waste heat utilization system is suitable for popularization.
Example two:
the present embodiment is a further improvement on the basis of the first embodiment, and specific differences between the present embodiment and the first embodiment are:
in this embodiment, it should be further explained that the gas turbine set 1 includes a gas compressor 11, a combustion chamber 12 and a gas turbine 13 which are sequentially communicated, and a flue gas outlet pipeline of the gas turbine 13 is communicated with a flue gas inlet of the waste heat boiler 4. Air enters the air compressor 11 after being cooled by the first heat exchanger 5, the air compressor 11 boosts the pressure of the air, then the air is combusted with natural gas in the combustion chamber 12 to generate high-temperature flue gas, the high-temperature flue gas enters the gas turbine 13 to do work, and the flue gas discharged by the gas turbine 13 enters the waste heat boiler 4, so that the fuel gas passing through the first heat exchanger 5 is conveniently heated.
Example three:
the present embodiment is a further improvement on the basis of the second embodiment, and specific differences between the present embodiment and the second embodiment are:
in this embodiment, it should be further noted that the natural gas input pipeline of the combustion chamber 12 is externally connected with natural gas 8 as a gas source of the fuel gas.
Example four:
the present embodiment is a further improvement on the basis of the second embodiment or the third embodiment, and the specific differences between the present embodiment and the second embodiment or the third embodiment are:
it should be further explained in this embodiment that the first heat exchanger 5 is disposed outside the natural gas input pipeline of the combustion chamber 12, so that the gas source of the combustion chamber 12 is heated by the first heat exchanger 5, the overall combustion rate is higher, meanwhile, the waste heat of the flue gas of the waste heat boiler 4 is utilized to heat the fuel gas, and the waste heat is fully recycled.
Example five:
the present embodiment is a further improvement on the basis of any one of the first to fourth embodiments, and the specific differences between the present embodiment and any one of the first to fourth embodiments are as follows:
in this embodiment, it should be further noted that a hot water booster pump 7 is disposed at a connection between the low-temperature hot water output end of the refrigerator 3 and the low-temperature hot water input end of the hot water heat exchanger 6. The low-temperature hot water after heat utilization is boosted by the hot water booster pump and returned to the hot water heat exchanger at the tail part of the waste heat boiler, so that resources are reused, and the cost is saved.
Example six:
the present embodiment is a further improvement on the basis of any one of the first to fifth embodiments, and the specific differences between the present embodiment and any one of the first to fifth embodiments are as follows:
in this embodiment, it should be further noted that the chilled water output end of the refrigerator 3 is connected to the chilled water input end of the first heat exchanger. A chilled water loop is formed between the refrigerating machine 3 and the first heat exchanger 5, resources are reused, and cost is saved.
The present invention is not limited to the above-mentioned optional embodiments, and any other products in various forms can be obtained by anyone under the teaching of the present invention, and any changes in the shape or structure thereof, all the technical solutions falling within the scope of the present invention, are within the protection scope of the present invention.
Claims (6)
1. The utility model provides a gas-steam combined cycle power generation waste heat utilization system, includes gas turbine unit, steam turbine, refrigerator and exhaust-heat boiler, its characterized in that: a flue gas outlet pipeline of the gas turbine unit is communicated with a flue gas inlet of the waste heat boiler; the steam outlet pipeline of the waste heat boiler is communicated with the steam inlet pipeline of the steam turbine; a first heat exchanger is arranged on an air inlet pipeline of the gas turbine, and a heating air inlet of the first heat exchanger is communicated with a flue gas outlet pipeline of the waste heat boiler; the tail part of the waste heat boiler is provided with a hot water heat exchanger, the high-temperature hot water output end of the hot water heat exchanger is connected with the high-temperature hot water input end of the refrigerator, and the low-temperature hot water output end of the refrigerator is connected with the low-temperature hot water input end of the hot water heat exchanger, so that a gas-steam combined cycle power generation waste heat utilization loop is formed.
2. The gas-steam combined cycle power generation waste heat utilization system of claim 1, characterized in that: the gas turbine set comprises a gas compressor, a combustion chamber and a gas turbine which are sequentially communicated, and a flue gas outlet pipeline of the gas turbine is communicated with a flue gas inlet of the waste heat boiler.
3. The gas-steam combined cycle power generation waste heat utilization system of claim 2, characterized in that: and the natural gas input pipeline of the combustion chamber is externally connected with natural gas.
4. A gas-steam combined cycle power generation waste heat utilization system according to claim 2 or 3, characterized in that: the first heat exchanger is arranged outside a natural gas input pipeline of the combustion chamber.
5. The gas-steam combined cycle power generation waste heat utilization system of claim 1, characterized in that: and a hot water booster pump is arranged at the joint of the low-temperature hot water output end of the refrigerator and the low-temperature hot water input end of the hot water heat exchanger.
6. The gas-steam combined cycle power generation waste heat utilization system of claim 1, characterized in that: and the chilled water output end of the refrigerator is connected with the chilled water input end of the first heat exchanger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921148037.3U CN210152743U (en) | 2019-07-19 | 2019-07-19 | Gas-steam combined cycle power generation waste heat utilization system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921148037.3U CN210152743U (en) | 2019-07-19 | 2019-07-19 | Gas-steam combined cycle power generation waste heat utilization system |
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| CN210152743U true CN210152743U (en) | 2020-03-17 |
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| CN201921148037.3U Active CN210152743U (en) | 2019-07-19 | 2019-07-19 | Gas-steam combined cycle power generation waste heat utilization system |
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- 2019-07-19 CN CN201921148037.3U patent/CN210152743U/en active Active
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