CN214035887U - Exhaust waste heat utilization system of cooling air heat exchanger of hot channel of gas turbine - Google Patents
Exhaust waste heat utilization system of cooling air heat exchanger of hot channel of gas turbine Download PDFInfo
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- CN214035887U CN214035887U CN202022807118.9U CN202022807118U CN214035887U CN 214035887 U CN214035887 U CN 214035887U CN 202022807118 U CN202022807118 U CN 202022807118U CN 214035887 U CN214035887 U CN 214035887U
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Abstract
The utility model discloses a gas turbine hot aisle cooling air heat exchanger exhaust waste heat utilization system mainly includes compressor inlet channel, gas turbine, exhaust-heat boiler and steam turbine, gas turbine hot aisle cooling air heat exchanger and air passage. The utility model discloses a gas turbine hot channel cooling air heat exchanger high temperature exhaust energy heating gas turbine compressor with directly arranging originally admits air, improves the compressor inlet air temperature for the load factor of combined cycle unit under the part load operating mode obtains promoting, and then improves the generating efficiency of combined cycle unit, will reach the beneficial effect who improves the combined cycle unit and operate economic nature under the part load operating mode.
Description
Technical Field
The utility model belongs to the technical field of the energy utilization, concretely relates to gas turbine hot aisle cooling air heat exchanger exhaust waste heat utilization system.
Background
The combined cycle unit in China generally bears the peak regulation function of a power grid, runs under partial load working conditions for a long time, and has a new normal running state of the combined cycle unit due to the fact that under the current national economic downlink pressure, the number of hours for equipment utilization is small and the running load rate is low.
Compared with a basic load working condition, the operation economy of the combined cycle unit is seriously reduced under a partial load operation working condition, generally speaking, for a mainstream F-stage combined cycle unit, the operation load rate is reduced by 10%, the average heat consumption rate of unit hair power generation is increased by about 200-300 kJ/kWh, the power generation fuel cost is greatly increased, and the operation pressure of a power generation enterprise is increased. Therefore, it is necessary to implement efficiency improvement optimization and improvement on the combined cycle unit, especially to take measures to improve the operation economy of the unit under partial load conditions.
The performance of the combined cycle unit is greatly influenced by the change of the air inlet temperature of the air compressor, the specific volume of air is increased along with the increase of the air temperature at the inlet of the air compressor, the mass flow of the air sucked by the air compressor is reduced, and the rated power generation power (the power when the load factor is 100%) of the combined cycle unit is reduced along with the increase of the air temperature at the inlet of the air compressor. Therefore, under the partial load working condition of the target electric power of the given combined cycle unit, the combined cycle unit can realize the special operation mode that the total output of the combined cycle unit is unchanged but the load rate of the combined cycle unit is increased by improving the temperature of the air at the inlet of the air compressor, thereby improving the actual operation efficiency and the economical efficiency of the combined cycle unit.
The initial temperature of the turbine of the F-level gas turbine reaches about 1400 ℃, and in order to ensure safe and reliable operation of hot channel parts at high temperature, cooling air channels are designed in key hot channel parts such as a combustion chamber liner, a nozzle, a moving blade and the like of the gas turbine, so that the operation temperature of the hot channel parts is reduced. The hot channel cooling air source is generally extracted from the middle stage or the last stage of a gas turbine compressor, the power consumption of the compressor is reduced for reducing the consumption of the cooling air, and meanwhile, a part of models of gas turbines (such as Mitsubishi M701F3) are provided with hot channel cooling air heat exchangers by utilizing the high-grade heat of the cooling air, as shown in figure 1. In a gas turbine hot channel cooling air heat exchanger, a fan sucks in cold air, the cold air is subjected to air extraction and convection heat exchange with a compressor in a TCA heat exchanger (a compressed air heat exchanger) to form hot air, the hot air is further subjected to convection heat exchange with cold natural gas in an FGH heat exchanger (a natural gas heat exchanger) and then is discharged into the atmosphere, generally, natural gas in the FGH heat exchanger can only recover about 60% of the heat extraction capacity of the compressor in the TCA heat exchanger, and the hot channel cooling air heat exchanger still can discharge a large amount of high-temperature air to the atmosphere (the temperature of the high-temperature air directly discharged under the design working condition exceeds 160 ℃ and the heat exceeds 4MW), so that energy waste and environmental heat pollution are caused.
At present, an energy-saving system which is reasonable in design, can utilize the exhaust waste heat of the air heat exchanger cooled by the hot channel of the gas turbine and can improve the running economy of the combined cycle unit under partial load working conditions does not exist.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the not enough of prior art existence, provide a gas turbine hot aisle cooling air heat exchanger exhaust waste heat utilization system, both usable gas turbine hot aisle cooling air heat exchanger exhaust waste heat can improve combined cycle unit partial load operating mode operation economic nature again.
The utility model discloses a following technical scheme realizes:
a gas turbine hot channel cooling air heat exchanger exhaust waste heat utilization system comprises a gas compressor air inlet channel, a gas turbine, a waste heat boiler and a steam turbine, a gas turbine hot channel cooling air heat exchanger and an air channel; wherein the content of the first and second substances,
the gas turbine is provided with a natural gas inlet, an air inlet, a compressor air exhaust outlet, a hot channel cooling air inlet and an exhaust port; the cooling air heat exchanger of the hot channel of the gas turbine is provided with a natural gas inlet and outlet, a compressed air inlet and outlet and an air inlet and outlet; a natural gas outlet of the cooling air heat exchanger of the hot channel of the gas turbine is connected to a natural gas inlet of the gas turbine, a compressed air inlet of the cooling air heat exchanger of the hot channel of the gas turbine is connected to an air exhaust outlet of a compressor of the gas turbine, a compressed air outlet of the cooling air heat exchanger of the hot channel of the gas turbine is connected to a cooling air inlet of the hot channel of the gas turbine, and an air exhaust port of the gas turbine is connected to a flue gas inlet of a waste heat boiler and a flue gas inlet of the waste heat boiler in the steam turbine;
the air channel comprises a first air channel and a second air channel, the air inlet channel of the air compressor is provided with an air inlet and an air outlet, the first air channel is provided with an air inlet and an air outlet, the air inlet of the air compressor is connected to the air outlet of the first air channel and the outside atmosphere, the air outlet of the air compressor is connected to the air inlet of the gas turbine, the air inlet of the first air channel is connected to the air outlet of the cooling air heat exchanger of the heat channel of the gas turbine, the second air channel is provided with an air inlet and an air outlet, and the air outlet of the cooling air heat exchanger of the heat channel of the gas turbine is connected with the air inlet of the second air channel.
The utility model discloses further improvement lies in, gas turbine is including the compressor, combustion chamber and the gas turbine that connect gradually, wherein, is provided with air inlet and compressor bleed outlet on the compressor, is provided with the natural gas entry on the combustion chamber, is provided with gas vent and hot passageway cooling air entry on the gas turbine.
The utility model discloses a further improvement lies in, gas turbine hot aisle cooling air heat exchanger is including the fan group, compressed air heat exchanger and the natural gas heat exchanger that connect gradually to and contain the heat exchanger housing including fan group, compressed air heat exchanger and natural gas heat exchanger, wherein, be provided with the compressed air access & exit on the compressed air heat exchanger, be provided with the natural gas access & exit on the natural gas heat exchanger, be provided with the air access & exit on the heat exchanger housing.
The utility model discloses a further improvement lies in, is provided with first air flow control valve and second air flow control valve in first air duct and second air duct's the entry respectively.
The utility model discloses further improvement lies in, is provided with compressor inlet air temperature measurement system in the compressor inlet channel.
The utility model discloses further improvement lies in, exhaust-heat boiler among exhaust-heat boiler and the steam turbine is vertical, horizontal, non-reheat, reheat formula, single pressure, two pressures, three pressures and above pressure level.
The utility model discloses further improvement lies in, the matching pattern of the steam turbine among gas turbine and exhaust-heat boiler and the steam turbine is unipolar, minute axle, one drags one or more drags one.
The utility model discloses further improvement lies in, and the steam turbine type among exhaust-heat boiler and the steam turbine is reheat formula, non-reheat, pure formula of congealing, steam extraction condensing, steam extraction back pressure formula or pure back pressure formula.
The utility model discloses at least, following profitable technological effect has:
the utility model provides a pair of gas turbine hot aisle cooling air heat exchanger exhaust waste heat utilization system, recoverable gas turbine hot aisle cooling air heat exchanger used heat, the energy of recovery directly returns the compressor air inlet and mixes with the compressor air inlet, can improve compressor inlet temperature, combines the actual conditions of a certain F level one to drag a straight condensing combined cycle unit (the gas turbine model is M701F) to carry out the quantitative calculation: as shown in fig. 2, the inlet air temperature of the compressor can be raised by using the whole exhaust waste heat of the cooling air heat exchanger of the gas turbine hot channel, wherein the inlet air temperature of the compressor can be raised by 7-13 ℃ (when the atmospheric temperature is 15 ℃) and 10-16 ℃ (when the atmospheric temperature is 30 ℃), and the inlet air mass flow of the compressor is smaller when the target electrical load of the combined cycle unit is lower, the atmospheric temperature is higher and the inlet air mass flow of the compressor is lower, and at the moment, the inlet air temperature of the compressor can be raised by using the exhaust waste heat of the cooling air heat exchanger of the gas turbine hot channel.
The utility model discloses to directly arrange originally to atmospheric gas turbine hot aisle cooling air heat exchanger high temperature exhaust introduce gas turbine compressor air inlet, make compressor inlet air temperature obtain promoting, under the same target power generation load (partial load), the load factor of combined cycle unit has been improved, make combined cycle unit power generation efficiency obtain promoting will reach the beneficial effect who improves combined cycle unit partial load operating mode (the unit load factor is less than 100% operating mode promptly) generating efficiency, reach gas turbine hot aisle cooling air heat exchanger high temperature exhaust waste heat utilization, improve the energy-conserving effect of combined cycle unit operational economy.
Drawings
FIG. 1 is a schematic diagram of an exemplary M701F gas turbine hot path cooling air heat exchanger and design parameters.
FIG. 2 is a schematic diagram of the amount by which compressor inlet air temperature may be increased using exhaust waste heat.
FIG. 3 is a schematic diagram of the energy-saving efficiency-increasing space of the compressor when the inlet air temperature is increased by 5 DEG C
FIG. 4 is a schematic structural diagram of an exhaust waste heat utilization system of a hot channel cooling air heat exchanger of a gas turbine according to the present invention.
Description of reference numerals:
the system comprises a compressor, a gas compressor, a combustor, a waste heat boiler, a turbine, a fan set, a compressed air heat exchanger, a natural gas heat exchanger, a heat exchanger shell, a first air channel, a second air channel, a first air flow regulating valve, a second air flow regulating valve and a gas compressor air inlet temperature measuring system, wherein the compressor is 1, the compressor is 2, the combustor is 3, the gas turbine is 4, the waste heat boiler and the turbine are 5, the fan set is 6, the compressed air heat exchanger is 7, the natural gas heat exchanger is 8, the heat exchanger shell is 9, the first air flow regulating valve is 10, the second air flow regulating valve is 11, and the gas compressor air inlet temperature measuring system is 103.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and embodiments:
as shown in fig. 4, the present invention provides a gas turbine hot channel cooling air heat exchanger exhaust waste heat utilization system, including: the system comprises a compressor air inlet channel 1, a gas turbine, a waste heat boiler and steam turbine system 5, a gas turbine hot channel cooling air heat exchanger, a first air channel 10, a second air channel 11, a first air flow regulating valve 101, a second air flow regulating valve 102 and a compressor air inlet temperature measuring system 103; the gas turbine comprises a gas compressor 2, a combustion chamber 3 and a gas turbine 4 which are connected in sequence; the gas turbine hot path cooling air heat exchanger comprises a fan set 6, a compressed air heat exchanger 7 and a natural gas heat exchanger 8 which are connected in series, and a heat exchanger casing 9 which contains the above components.
Wherein, the natural gas is heated by a natural gas heat exchanger 8 and then enters the combustion chamber 3; air sequentially passes through an air inlet channel 1 of the air compressor and the air compressor 2 and then enters a combustion chamber 3, and the air and natural gas are combusted in the combustion chamber 3 and then enter a gas turbine 4; the exhaust gas of the gas turbine 4 enters the exhaust gas side of the waste heat boiler; the air extracted by the air compressor enters the gas turbine 4 after being cooled by the compressed air heat exchanger 7;
the air is sucked by the fan set 6 and then enters the heat exchanger housing 9, the air becomes hot air after being subjected to heat convection by the compressed air heat exchanger 7, the hot air is further subjected to heat convection and temperature reduction with the natural gas heat exchanger 8 to form two paths of high-temperature exhaust, and the first path of high-temperature exhaust sequentially passes through the first air flow regulating valve 101 and the first air channel 10, is mixed with the air in the air inlet channel 1 of the air compressor and then enters the air compressor 2; the second path of high-temperature exhaust gas passes through the second air flow regulating valve 102 and the second air passage 11 in sequence and then is discharged into the atmosphere.
The flow distribution of the two paths of high-temperature exhaust gases is controlled by changing the opening degrees of the first air flow regulating valve 101 and the second air flow regulating valve 102, and the flow distribution principle is that the high-temperature exhaust gases enter the first air channel 10 as far as possible on the premise that the safe operation of the unit is ensured and the output electric load reaches a target value.
The compressor inlet air temperature is monitored by a compressor inlet air temperature measuring system 103 arranged in the compressor inlet air passage 1, and the opening degrees of the first air flow regulating valve 101 and the second air flow regulating valve 102 are controlled by a control system to maintain the compressor inlet air temperature not to exceed the operation limit value.
As shown in figure 3, under the same target power generation load (partial load), the estimated power generation heat consumption rate of the combined cycle unit can be reduced by 17.6 kJ/kWh-41.2 kJ/kWh for every 5 ℃ increase of the air inlet temperature of the air compressor, and the lower the target power generation load of the combined cycle unit, the larger the reduction amount of the power generation heat consumption rate of the combined cycle unit is.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent one embodiment of the present invention, and the description thereof is specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (8)
1. The exhaust waste heat utilization system of the cooling air heat exchanger of the hot channel of the gas turbine is characterized by comprising a gas compressor air inlet channel (1), the gas turbine, a waste heat boiler and a steam turbine (5), the cooling air heat exchanger of the hot channel of the gas turbine and an air channel; wherein the content of the first and second substances,
the gas turbine is provided with a natural gas inlet, an air inlet, a compressor air exhaust outlet, a hot channel cooling air inlet and an exhaust port; the cooling air heat exchanger of the hot channel of the gas turbine is provided with a natural gas inlet and outlet, a compressed air inlet and outlet and an air inlet and outlet; a natural gas outlet of the cooling air heat exchanger of the hot channel of the gas turbine is connected to a natural gas inlet of the gas turbine, a compressed air inlet of the cooling air heat exchanger of the hot channel of the gas turbine is connected to an air exhaust outlet of a compressor of the gas turbine, a compressed air outlet of the cooling air heat exchanger of the hot channel of the gas turbine is connected to a cooling air inlet of the hot channel of the gas turbine, and an air exhaust port of the gas turbine is connected to a flue gas inlet of a waste heat boiler in the waste heat boiler and a steam turbine (5);
the air channel comprises a first air channel (10) and a second air channel (11), an air inlet and an air outlet are formed in the air compressor air inlet channel (1), the first air channel (10) is provided with the air inlet and the air outlet, the air inlet of the air compressor air inlet channel (1) is connected to the air outlet of the first air channel (10) and the outside atmosphere, the air outlet of the air compressor air inlet channel (1) is connected to the air inlet of the gas turbine, the air inlet of the first air channel (10) is connected to the air outlet of the gas turbine heat channel cooling air heat exchanger, the second air channel (11) is provided with the air inlet and the air outlet, and the air outlet of the gas turbine heat channel cooling air heat exchanger is connected with the air inlet of the second air channel (11).
2. The exhaust waste heat utilization system of the cooling air heat exchanger of the hot channel of the gas turbine as claimed in claim 1, wherein the gas turbine comprises a compressor (2), a combustion chamber (3) and a gas turbine (4) which are connected in sequence, wherein the compressor (2) is provided with an air inlet and a compressor extraction outlet, the combustion chamber (3) is provided with a natural gas inlet, and the gas turbine (4) is provided with an exhaust outlet and a hot channel cooling air inlet.
3. The exhaust gas waste heat utilization system of the gas turbine hot channel cooling air heat exchanger according to claim 1, wherein the gas turbine hot channel cooling air heat exchanger comprises a fan set (6), a compressed air heat exchanger (7) and a natural gas heat exchanger (8) which are connected in sequence, and a heat exchanger housing (9) which contains the fan set (6), the compressed air heat exchanger (7) and the natural gas heat exchanger (8), wherein the compressed air heat exchanger (7) is provided with a compressed air inlet and outlet, the natural gas heat exchanger (8) is provided with a natural gas inlet and outlet, and the heat exchanger housing (9) is provided with an air inlet and outlet.
4. The gas turbine hot aisle cooling air heat exchanger exhaust gas waste heat utilization system of claim 1, characterized in that a first air flow regulating valve (101) and a second air flow regulating valve (102) are disposed in inlets of the first air aisle and the second air aisle, respectively.
5. The exhaust waste heat utilization system of the cooling air heat exchanger of the hot channel of the gas turbine as claimed in claim 1, characterized in that a compressor inlet air temperature measuring system (103) is provided in the compressor inlet channel (1).
6. The exhaust gas waste heat utilization system of a gas turbine hot channel cooling air heat exchanger according to claim 1, characterized in that the exhaust heat boiler in the exhaust heat boiler and the steam turbine (5) is of vertical, horizontal, non-reheat, single pressure, double pressure, triple pressure and above pressure grade.
7. The exhaust waste heat utilization system of the cooling air heat exchanger of the hot channel of the gas turbine as claimed in claim 1, wherein the matching type of the gas turbine and the steam turbine in the exhaust heat boiler and the steam turbine (5) is single shaft, split shaft, one-to-one or more-to-one.
8. The exhaust waste heat utilization system of the cooling air heat exchanger of the hot channel of the gas turbine as claimed in claim 1, wherein the turbine type of the exhaust heat boiler and the turbine (5) is reheat type, non-reheat type, condensing type, extracting and back pressure type or pure back pressure type.
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| CN202022807118.9U CN214035887U (en) | 2020-11-26 | 2020-11-26 | Exhaust waste heat utilization system of cooling air heat exchanger of hot channel of gas turbine |
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| CN202022807118.9U CN214035887U (en) | 2020-11-26 | 2020-11-26 | Exhaust waste heat utilization system of cooling air heat exchanger of hot channel of gas turbine |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112360633A (en) * | 2020-11-26 | 2021-02-12 | 华能国际电力股份有限公司 | Exhaust waste heat utilization system of cooling air heat exchanger of hot channel of gas turbine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112360633A (en) * | 2020-11-26 | 2021-02-12 | 华能国际电力股份有限公司 | Exhaust waste heat utilization system of cooling air heat exchanger of hot channel of gas turbine |
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