CN214170638U - Gas turbine inlet temperature control device - Google Patents
Gas turbine inlet temperature control device Download PDFInfo
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- CN214170638U CN214170638U CN202021119944.8U CN202021119944U CN214170638U CN 214170638 U CN214170638 U CN 214170638U CN 202021119944 U CN202021119944 U CN 202021119944U CN 214170638 U CN214170638 U CN 214170638U
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The utility model discloses a gas turbine inlet air temperature control device, include: the system comprises a gas turbine, a waste heat boiler, a steam turbine, an air inlet temperature control device, a condenser, a cooling tower and a closed cold water system; the gas turbine is communicated with an air inlet pipeline of the waste heat boiler through an exhaust pipeline; an exhaust pipeline of the waste heat boiler is communicated with a steam turbine; the cooling tower is respectively communicated with the condenser and the closed cold water system; the closed water cooling system is communicated with the secondary cooler; the air inlet temperature control device comprises an air heat exchanger, a second water pump, a valve c and a valve d; the utility model adopts the high-efficiency heat exchanger technology, solves the problem of recycling low-grade heat sources, applies the low-grade heat to the inlet air of the compressor for heating, and improves the efficiency of the gas-steam combined cycle; the irreversible loss during combustion of the combustion chamber is reduced, and the purpose of saving fuel consumption is achieved, so that the economy of the gas power plant is further improved.
Description
Technical Field
The utility model relates to a gas turbine technical field especially relates to a gas turbine inlet air temperature control field.
Background
The gas turbine is a rotary power machine which takes continuously flowing gas as a working medium and converts heat energy into mechanical work. Because the air is used as working medium, the operation condition of the gas turbine is easily influenced by the temperature, humidity and the like of the outside air. On the other hand, the operating efficiency of a gas turbine is very sensitive to the operating load due to the precision of the gas turbine system. As existing research indicates, as the atmospheric temperature increases, the relative efficiency of the gas turbine decreases, the relative output power decreases, and the relative efficiency of the gas-steam combined cycle increases. In China, a gas power plant mainly bears the peak regulation function of a power grid, and the power of a gas turbine is adjusted by the power plant according to the requirement of power grid regulation under the general condition, so that the full-load operation of the gas turbine is difficult to guarantee. The gas turbine works in a partial load interval for a long time, so that the operation efficiency of the system is greatly reduced, and the energy is greatly wasted.
At present, gas turbines of power plants in China are all provided with air Inlet Guide Vanes (IGVs), and the throat area of the IGVs is reduced by adjusting the deflection angle of the IGVs, so that the mass flow of air is reduced, and the output of gas turbine units is reduced. This adjustment method has the following technical drawbacks:
(1) when the IGV is closed, the incidence angle of the airflow of each stage of blades behind the IGV deviates from the design value, the throttling loss of the air inlet of the combustion engine flowing in the IGV is increased, and the efficiency of the gas compressor is reduced;
(2) when the load of the combustion engine is much lower than the rated load, the IGV regulation cannot meet the regulation of the load of the combustion engine, and the load of the combustion engine is regulated by reducing the turbine front temperature, so that the efficiency of the combustion engine is further reduced.
In view of the actual condition that the domestic gas turbine operates under the non-rated working condition most of the time at present, the density of the inlet air is reduced by improving the inlet air temperature of the gas turbine, the IGV angle of the air compressor is enlarged, and the air throttling loss in the IGV is reduced, so that the gas turbine can operate under partial rated load on the premise of ensuring that the inlet air mass flow of the air compressor is unchanged.
The intake air heating technology of the combustion engine is mainly used for the combustion engine to run at a part load and a constant load. When the gas turbine operates at partial load and constant load, the mass flow of the air inlet of the gas compressor is a constant value, the air inlet temperature of the gas turbine is increased, the density of the air inlet is reduced, the volume flow of the air inlet is increased, the IGV angle of the gas compressor is forced to be enlarged, the throttling loss of the air flow in the IGV is reduced, and the operation condition of the gas compressor is improved.
At present, a group of finned tube heaters are arranged in an air inlet system, and the hot water of a waste heat boiler or other heat sources are introduced to heat the inlet air of a combustion engine. The air inlet heating mode can better utilize waste heat of the unit and improve the generating efficiency of combined cycle, but has the defects of large modification engineering amount, large air inlet flow resistance and high investment.
Therefore, although the efficiency of the gas-steam combined cycle can be improved by gas-steam combined cycle heating, how to select a low-grade heat source and economically recycle the low-grade heat source to improve the overall economy of the system is the core of the construction of the gas-steam combined cycle heating system.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a gas turbine inlet air temperature control to solve the problem that above-mentioned prior art exists, can realize the rational utilization low-grade heat source, and economic recycle, with the whole economic nature that improves the system.
In order to achieve the above object, the utility model provides a following scheme: the utility model provides an air inlet temperature control device of a gas turbine, which is characterized by comprising a gas turbine, a waste heat boiler, a steam turbine, an air inlet temperature control device, a condenser, a cooling tower and a closed cooling water system;
the urban heat supply network system sequentially comprises a heat supply network heater, a water delivery cooler and a secondary cooler according to the flow direction of a pipeline;
the gas turbine is communicated with an air inlet pipeline of the waste heat boiler through an exhaust pipeline; an exhaust pipeline of the waste heat boiler is communicated with the steam turbine; an exhaust pipeline of the steam turbine exchanges heat with the condenser and is communicated with the waste heat boiler through a first water pump; the cooling tower is respectively communicated with the condenser and the closed cold water system; the closed water cooling system is communicated with the secondary cooler; the air inlet temperature control device comprises a temperature control part, and the temperature control part is arranged between the closed cold water system and the gas turbine.
The temperature control part comprises an air heat exchanger, a second water pump, a valve c and a valve d, one end of a high-temperature pipeline of the air heat exchanger is communicated with an air inlet pipeline of the gas turbine, and the other end of the high-temperature pipeline of the air heat exchanger is communicated with the closed cold water system through the second water pump and the valve c; one end of a low-temperature pipeline of the air heat exchanger is communicated with the outside, and the other end of the low-temperature pipeline is communicated with the closed cold water system through a valve d.
In the prior art, the economy of the gas-steam combined cycle can be improved by an inlet air heating technology, but how to select a heat source, a design scheme of an inlet air heating system and a design of a heat exchanger are also important. A common source of heat in power plants today includes heat extracted from compressors or turbines. The method has poor economic benefit because the used heat is a high-grade heat source with high temperature and high pressure.
The method is a simple and effective mode for improving the air inlet temperature by adopting electric heating, and the air inlet of the gas turbine can be heated by the resistance wires by arranging a plurality of groups of electric heaters in the air inlet system of the gas turbine. Although the temperature control is simple by adopting an electric heating mode, a large amount of electric energy needs to be consumed, and the efficiency of the unit is not improved.
This patent utilizes the waste heat of gas turbine power plant to heat gas turbine inlet air, reduces the gas turbine unit and generates electricity heat consumption, improves combined cycle unit's whole operation economic nature.
The urban heat supply network system comprises a heat supply network heater, a primary hydrophobic cooler and a secondary hydrophobic cooler; an exhaust pipeline of the steam turbine is communicated with an air inlet pipeline of the heat supply network heater; the heat supply network heater, the primary drainage cooler and the secondary drainage cooler are communicated in sequence through pipelines; the air heat exchanger is communicated with the closed cold water system through the secondary drainage cooler; and the recycling pipeline of the secondary drainage cooler exchanges heat through the condenser.
An intermediary water device is also arranged; the intermediate water device is also provided with a valve e and a valve f; one end of the intermediate water device is communicated with a high-temperature pipeline of the secondary cooler through a valve e; the other end is communicated with a low-temperature pipeline of the secondary cooler through a valve f.
The closed water cooling system is also provided with a valve a and a valve b; one end of the cold water closing system is communicated with a high-temperature pipeline of the secondary cooler through a valve a; the other end is communicated with a low-temperature pipeline of the secondary cooler through a valve b.
Preferably, an economizer, an evaporator and a superheater are arranged in the waste heat boiler; the economizer is communicated with an exhaust pipeline of the gas turbine; the evaporator is communicated with an exhaust pipeline of the waste heat boiler; and the superheater is communicated with a recycling pipeline of the waste heat boiler.
The utility model discloses a following technological effect: the heat below 55 ℃ is low-grade heat, and the problems of difficult recovery and limited application outlet exist due to small temperature difference with low-temperature fluid, the project adopts a high-efficiency heat exchanger technology, solves the problem of recovery of low-grade heat sources, and simultaneously applies the low-grade heat to the inlet air of the air compressor of the gas turbine to heat the inlet air of the air compressor under certain working conditions, thereby improving the efficiency of gas-steam combined cycle while solving the greenhouse effect; and the gas compressor can be closer to the designed working condition by recovering the low-grade waste heat of the gas-steam combined cycle system, the temperature of the air at the outlet of the gas compressor is improved, the irreversible loss during combustion of the combustion chamber is reduced, and the purpose of saving fuel consumption is achieved, so that the economy of a gas power plant is further improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a system diagram of a first embodiment of the present invention.
FIG. 2 is a system diagram of a second embodiment of the present invention
FIG. 3 is a system diagram of a third embodiment of the present invention
FIG. 4 is a system diagram of the fourth embodiment of the present invention
The system comprises a gas turbine 1, a waste heat boiler 2, a steam turbine 3, an urban heat supply network system 4, an air inlet temperature control device 5, a condenser 6, a cooling tower 7, a closed cold water system 8, a medium water device 9, an economizer 21, an evaporator 22, a superheater 23, a heat supply network heater 41, a primary hydrophobic cooler 42, a secondary hydrophobic cooler 43, an air heat exchanger 51, a secondary water pump 52, a valve c53, a valve d54, a valve i55, a first water pump 61, a valve a81, a valve b82, a valve e91 and a valve f 92.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only 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 work belong to the protection scope of the present invention.
In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.
The utility model provides a gas turbine inlet air temperature control device, which comprises a gas turbine 1, a waste heat boiler 2, a steam turbine 3, an inlet air temperature control device 5, a condenser 6, a cooling tower 7 and a closed cooling water system 8;
the gas turbine 1 is communicated with an air inlet pipeline of the waste heat boiler 2 through an exhaust pipeline; an exhaust pipeline of the waste heat boiler 2 is communicated with a steam turbine 3; the recycling pipeline of the steam turbine 3 exchanges heat through the condenser 6 and is communicated with the waste heat boiler 2 through the first water pump 61; the cooling tower 7 is respectively communicated with the condenser 6 and the closed cold water system 8; the closed cooling water system 8 is communicated with the secondary cooler 43; the inlet air temperature control device 5 comprises a temperature control part, and the temperature control part is arranged between the closed cold water system 8 and the gas turbine 1.
The temperature control part comprises an air heat exchanger 51, a second water pump 52, a valve c53 and a valve d54, one end of a high-temperature pipeline of the air heat exchanger 51 is communicated with an air inlet pipeline of the gas turbine 1, and the other end of the high-temperature pipeline is communicated with the cold water closing system 8 through the second water pump 52 and the valve c 53; one end of the low-temperature pipeline of the air heat exchanger 51 is communicated with the outside, and the other end of the low-temperature pipeline is communicated with the closed water cooling system 8 through a valve d 54.
The urban heat supply network system 4 comprises a heat supply network heater 41, a primary hydrophobic cooler 42 and a secondary hydrophobic cooler 43; the exhaust pipeline of the steam turbine 3 is communicated with the air inlet pipeline of the heating network heater 41; the heat supply network heater 41, the primary hydrophobic cooler 42 and the secondary hydrophobic cooler 43 are communicated with each other through pipelines in sequence; the air heat exchanger 51 is communicated with the closed water cooling system 8 through the secondary drainage cooler 43; the reuse pipe of the secondary drainage cooler 43 exchanges heat through the condenser 6.
An intermediate water device 9 is also arranged; the intermediate water device 9 is also provided with a valve e91 and a valve f 92; one end of the intermediate water device 9 is communicated with the high-temperature pipeline of the secondary cooler 43 through a valve e 91; the other end is communicated with a low-temperature pipeline of the secondary cooler 43 through a valve f 92; the heat supply network heater 41 is communicated with the urban heat supply network pipeline; the primary hydrophobic cooler 42 is communicated with the urban pipe network pipeline.
The cold water shut-off system 8 is also provided with a valve a81 and a valve b 82; one end of the cold water closing system 8 is communicated with a high-temperature pipeline of the secondary cooler 43 through a valve a 81; and the other end is communicated with the low-temperature pipeline of the secondary cooler 43 through a valve b 82.
The waste heat boiler 2 is provided with an economizer 21, an evaporator 22 and a superheater 23; the 21 economizer is communicated with an exhaust pipeline of the gas turbine 1; the evaporator 22 is communicated with an exhaust pipeline of the waste heat boiler 2; the superheater 23 is communicated with a reuse pipe of the waste heat boiler 2.
According to fig. 1, in a first embodiment of the invention, the exhaust gas of the gas turbine 1 is fed into a waste heat boiler 2 for generating steam, which is introduced into a steam turbine 3 for acting; pumping steam with the temperature of 280-320 ℃ out of the steam turbine 3, and feeding the steam into a heat supply network heater 41 for supplying heat to an urban heat supply network; the hydrophobic water with the temperature reduced to 68-73 ℃ enters a first-stage steam trap 42 for supplying heat to the urban pipeline; the drained water with the temperature reduced to 53-58 ℃ enters a secondary steam trap 43, and other heat is conducted into a closed cold water system 8 through a pipeline and released to the outside through a cooling tower 7;
the drained water with the temperature reduced to 53-58 ℃ enters a secondary steam trap 43, a valve a81 and a valve b82 are closed, and a pipeline between a closed cold water system 8 and the secondary steam trap 43 is closed; opening the valve c53, the valve d54, the valve e91 and the valve f92, heating the cold air by the intermediary water and entering the air heat exchanger 51, and piping to the gas turbine 1;
and (3) introducing exhaust gas in the steam turbine 3 into a condenser 6, and introducing the exhaust gas into the waste heat boiler 2 through a first water pump 61 for cyclic utilization.
In order to prevent the loss of the circulating water in the air heater 51 from being reduced, a valve e91 and a valve f92 are added to the system for controlling the flow of the medium water. According to the temperature of the intermediate water and the flow and the temperature of the air at the inlet of the combustion engine, the air temperature at the inlet of the compressor can be adjusted by adjusting the opening degrees of the valve a81, the valve b82, the valve c53 and the valve d54, so that the operation condition of the gas-steam combined cycle can be better adapted. In this patent, air heat exchanger can adopt high-efficient plate heat exchanger, when improving the combustion engine inlet air temperature, the flow resistance of minimize air. The opening degrees of the valve a81, the valve b82, the valve c53 and the valve d54 can be systematically controlled by a PLC or other methods according to the threshold values of the air inlet temperature, the flow rate, the drainage temperature and the flow rate of the heat supply network of the combustion engine. The temperature in the system is only a value under a certain specific working condition in the gas-steam combined heat and power generation system, and in the implementation process of the patent, the specific temperature value is determined by the actual operation working condition.
Referring to fig. 2, in the second embodiment of the present invention, the condensed water cooled by the second-stage steam trap 43 directly enters the air heat exchanger 51 to heat the cold air without passing through the heat transfer of the intermediate water. In the operation process, the valve i55 is closed, the valve c53 and the valve d54 are opened, and the heat supply network is drained, so that the heat supply network can directly enter the air heat exchanger 51 to preheat air. According to the temperature of the intermediate water and the flow and the temperature of the cold air, the air temperature at the inlet of the compressor can be adjusted by adjusting the opening degrees of the valve i55, the valve c53 and the valve d54, so that the operation condition of the gas-steam combined cycle can be better adapted.
According to fig. 3, in the third embodiment of the present invention, the heat source for heating the air can also be derived from the closed cooling water system 8, and the heat in the closed cooling system 8 is introduced into the air heat exchanger 51. According to the flow and the temperature of the cold air, the air temperature at the inlet of the compressor can be adjusted through the opening degree of the valve c53 and the valve d54, so that the operation condition of the gas-steam combined cycle is better adapted. When air heating is not required, valve c53 and valve d54 are closed.
According to fig. 4, in the fourth embodiment of the present invention, the heat source for heating air can also be derived from the flue gas at the tail of the exhaust-heat boiler 2. And a heat collector 24 is arranged at the tail part of the waste heat boiler 2, and heat is collected from the flue gas at the temperature of 70-80 ℃ and used for heating the air at the inlet of the gas turbine 1. According to the flow and the temperature of the cold air, the air temperature at the inlet of the compressor can be adjusted through the opening degree of the valve c53 and the valve d54, so that the operation condition of the gas-steam combined cycle is better adapted. The scheme is that the heat collector is arranged in the waste heat boiler, so that the flue gas heat at the tail part of the waste heat boiler is effectively utilized, the efficiency of the gas-steam combined cycle is further improved, and the waste heat boiler can be used in four seasons.
In another embodiment of the present invention, as shown in the structure of the figure, a low temperature water pipe can be added to the air heat exchanger 51, so as to achieve the effect of changing the operation boundary by cooling when the load of the gas turbine 1 is too high.
The utility model discloses a following technological effect: the heat below 55 ℃ is low-grade heat, and the problems of difficult recovery and limited application outlet exist due to small temperature difference with low-temperature fluid, the project adopts a high-efficiency heat exchanger technology, solves the problem of recovery of low-grade heat sources, and simultaneously applies the low-grade heat to the inlet air of the air compressor of the gas turbine to heat the inlet air of the air compressor under certain working conditions, thereby improving the efficiency of gas-steam combined cycle while solving the greenhouse effect; and the gas compressor can be closer to the designed working condition by recovering the low-grade waste heat of the gas-steam combined cycle system, the temperature of the air at the outlet of the gas compressor is improved, the irreversible loss during combustion of the combustion chamber is reduced, and the purpose of saving fuel consumption is achieved, so that the economy of a gas power plant is further improved.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description of the present invention, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
The above-mentioned embodiments are only intended to describe the preferred embodiments of the present invention, but not to limit the scope of the present invention, and those skilled in the art should also be able to make various modifications and improvements to the technical solution of the present invention without departing from the spirit of the present invention, and all such modifications and improvements are intended to fall within the scope of the present invention as defined in the appended claims.
Claims (5)
1. The gas turbine inlet air temperature control device is characterized by comprising a gas turbine (1), a waste heat boiler (2), a steam turbine (3), an inlet air temperature control device (5), a condenser (6), a cooling tower (7) and a closed cold water system (8);
the gas turbine (1) is communicated with an air inlet pipeline of the waste heat boiler (2) through an exhaust pipeline; an exhaust pipeline of the waste heat boiler (2) is communicated with the steam turbine (3); the recycling pipeline of the steam turbine (3) exchanges heat through the condenser (6) and is communicated with the waste heat boiler (2) through a first water pump (61); the cooling tower (7) is respectively communicated with the condenser (6) and the closed water cooling system (8); the air inlet temperature control device (5) comprises a temperature control portion, and the temperature control portion is arranged between the closed cooling water system (8) and the gas turbine (1).
2. The gas turbine inlet air temperature control device according to claim 1, characterized in that: the temperature control part comprises an air heat exchanger (51), a second water pump (52), a valve c (53) and a valve d (54), one end of a high-temperature pipeline of the air heat exchanger (51) is communicated with an air inlet pipeline of the gas turbine (1), and the other end of the high-temperature pipeline is communicated with the cold water closing system (8) through the second water pump (52) and the valve c (53); one end of a low-temperature pipeline of the air heat exchanger (51) is communicated with the outside, and the other end of the low-temperature pipeline is communicated with the closed cold water system (8) through a valve d (54).
3. The gas turbine inlet air temperature control device according to claim 2, characterized in that: an urban heat supply network system (4) is also arranged; the urban heat supply network system (4) comprises a heat supply network heater (41), a primary hydrophobic cooler (42) and a secondary hydrophobic cooler (43); the exhaust pipeline of the steam turbine (3) is communicated with the air inlet pipeline of the heat supply network heater (41); the heat supply network heater (41), the primary hydrophobic cooler (42) and the secondary hydrophobic cooler (43) are communicated in sequence through pipelines; the air heat exchanger (51) is communicated with a closed water cooling system (8) through the secondary drainage cooler (43); and a recycling pipeline of the secondary hydrophobic cooler (43) exchanges heat through the condenser (6).
4. The gas turbine inlet air temperature control device according to claim 3, characterized in that: the closed water cooling system (8) is also provided with a valve a (81) and a valve b (82); one end of the cold water closing system (8) is communicated with a high-temperature pipeline of the secondary drainage cooler (43) through a valve a (81); the other end of the low-temperature pipeline is communicated with a low-temperature pipeline of the secondary hydrophobic cooler (43) through a valve b (82).
5. The gas turbine inlet air temperature control device according to claim 3, characterized in that: an intermediate water device (9) is also arranged; the intermediate water device (9) is also provided with a valve e (91) and a valve f (92); one end of the intermediate water device (9) is communicated with a high-temperature pipeline of the secondary drainage cooler (43) through a valve e (91); the other end of the low-temperature pipeline is communicated with a low-temperature pipeline of the secondary drainage cooler (43) through a valve f (92); the heat supply network heater (41) is communicated with an urban heat supply network pipeline; the primary hydrophobic cooler (42) is communicated with an urban pipe network pipeline.
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CN111577410A (en) * | 2020-06-17 | 2020-08-25 | 杨漪 | Gas turbine inlet air temperature control device and gas turbine inlet air temperature control method |
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CN111577410A (en) * | 2020-06-17 | 2020-08-25 | 杨漪 | Gas turbine inlet air temperature control device and gas turbine inlet air temperature control method |
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Effective date of registration: 20211215 Address after: 101299 411-20169, No. 20, Xiaoyuan Road, Wangxinzhuang Town, Pinggu District, Beijing Patentee after: Beijing enkangrui Energy Saving Technology Co.,Ltd. Address before: 041099 Room 601, unit 2, building 1, No. 85, Jiefang East Road, Yaodu District, Linfen City, Shanxi Province Patentee before: Yang Yi |
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