CN219605411U - Gas turbine decoupling system - Google Patents
Gas turbine decoupling system Download PDFInfo
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- CN219605411U CN219605411U CN202320668337.4U CN202320668337U CN219605411U CN 219605411 U CN219605411 U CN 219605411U CN 202320668337 U CN202320668337 U CN 202320668337U CN 219605411 U CN219605411 U CN 219605411U
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- 150000003839 salts Chemical class 0.000 claims abstract description 95
- 239000007789 gas Substances 0.000 claims abstract description 78
- 230000005611 electricity Effects 0.000 claims abstract description 55
- 239000002918 waste heat Substances 0.000 claims abstract description 32
- 238000005485 electric heating Methods 0.000 claims abstract description 24
- 238000002485 combustion reaction Methods 0.000 claims abstract description 8
- 239000000446 fuel Substances 0.000 claims abstract description 4
- 238000005338 heat storage Methods 0.000 claims description 11
- 238000010248 power generation Methods 0.000 claims description 7
- 239000008236 heating water Substances 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 4
- 239000011232 storage material Substances 0.000 claims description 4
- 239000013589 supplement Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000012782 phase change material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
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Abstract
The utility model discloses a gas turbine decoupling system, which belongs to the technical field of power supply peak regulation of power plants, and comprises: the gas turbine is used for driving a gas turbine generator to generate electricity by using fuel combustion and transmitting the electricity to a power grid; the waste heat boiler is used for generating steam by using combustion waste heat of the gas turbine; the steam turbine is used for driving a steam turbine generator to generate power by utilizing steam and externally supplying partial steam; and the electric heating molten salt system is used for converting electric energy of the power grid into heat energy for storage when electricity consumption is low or electricity price enters low electricity price. According to the system, the electric heating molten salt system is low in electric load demand of a power grid, a peak regulation period is required to be stopped, electric power is stored, the steam supply demand can be met, meanwhile, the on-line electric load can be reduced to zero, the electric load demand of the power grid is high, the steam supply of a waste heat boiler can be reduced, the generating capacity of a turbine generator is increased, the generating capacity of the gas turbine in the peak period is improved, and the thermoelectric decoupling of the gas turbine can be realized.
Description
Technical Field
The utility model belongs to the technical field of power plant power supply peak regulation, and particularly relates to a gas turbine decoupling system.
Background
With the increase of the new energy scale and the continuous increase of the peak valley difference of the power consumption and the gradual implementation of the spot market, the difficulty of guaranteeing the supply and demand balance of the power system is increasingly remarkable, and in the period of low valley of the power consumption, if the situation of large generation of the new energy occurs, the power is obviously rich, and at the moment, if the power generation load of a coal motor unit and a gas unit cannot be reduced, the problems of wind abandoning, light abandoning and the like can occur. In order to better develop and eliminate new energy and reduce energy cost, the peak shaving and peak shaving capacity of partial gas turbines except coal-fired units needs to be further excavated.
In the prior art, the gas turbine is used as a peak shaver set, and is started and stopped in a day for a plurality of times, so that the stability of the steam supply capacity of the gas turbine is greatly influenced.
Disclosure of Invention
The utility model aims to provide a decoupling system of a gas turbine, which is used for solving the problems that when the gas turbine is in low electricity consumption, the gas turbine needs to be shut down or the load is regulated to peak, the external steam supply requirement can not be met, and the electric load of a unit is increased at a peak section.
According to a first aspect of an embodiment of the present utility model, there is provided a gas turbine decoupling system, which may include:
the gas turbine is used for driving a gas turbine generator to generate electricity by using fuel combustion and transmitting the electricity to a power grid;
the waste heat boiler is used for generating steam by utilizing combustion waste heat of the gas turbine;
the steam turbine is used for driving a steam turbine generator to generate power by utilizing steam and externally supplying partial steam; and
And the electric heating molten salt system is used for converting electric energy of the power grid into heat energy for storage when electricity consumption is low or electricity price enters low electricity price.
In some alternative embodiments of the utility model, when electricity consumption goes low or electricity price goes low, the power generation load of the gas turbine is reduced, and steam generated by the waste heat boiler under the condition that the gas turbine is in low load is directly supplied to the outside.
In some optional embodiments of the present utility model, when the steam generated by the waste heat boiler cannot meet the external steam supply requirement, the electric heating molten salt system is further used for heating water to supplement the external steam supply notch.
In some optional embodiments of the utility model, when the electric load demand of the electric network is high or the electricity price is high, the electric heating molten salt system releases the stored heat, generates steam and supplies the steam to the outside, and replaces part or all of the waste heat boiler to supply the steam to the outside;
the steam turbine is used for generating electricity by utilizing part or all of steam generated by the waste heat boiler.
In some alternative embodiments of the utility model, the electric heating molten salt system is used for generating and storing heat energy by utilizing electricity of a power grid when the electric load demand of the power grid is low or the electric power grid enters a low electricity price, and the gas turbine is stopped, and the electric heating molten salt system is also used for generating steam and supplying the steam to the outside;
the electric heating molten salt system is also used for replacing the external steam supply of the gas turbine waste heat boiler in the electricity consumption peak period.
In some alternative embodiments of the utility model, the heat storage medium of the electrically heated molten salt system is a molten salt or a heat storage material.
In some alternative embodiments of the utility model, the electrically heated molten salt system comprises: the electric molten salt heater, the high-temperature molten salt tank and the low-temperature molten salt tank are connected in sequence;
the electric molten salt heater is connected with a power grid and is used for heating a thermal circulation medium by utilizing electric energy of the power grid;
the high-temperature molten salt tank and the low-temperature molten salt tank are used for storing heat energy in a thermal circulation medium.
In some alternative embodiments of the utility model, a step-down transformer is further provided between the electric molten salt heater and the power grid;
the step-down transformer is used for reducing the voltage of a power grid.
In some optional embodiments of the utility model, a molten salt steam heat exchanger is further disposed between the high temperature molten salt tank and the low temperature molten salt tank;
the fused salt steam heat exchanger is used for heating water to generate steam by utilizing heat energy in the thermal circulation medium and supplying steam to the outside.
In some alternative embodiments of the utility model, a high temperature molten salt pump is disposed between the high temperature molten salt tank and the molten salt steam heat exchanger;
a low-temperature molten salt pump is arranged between the low-temperature molten salt tank and the electric molten salt heater.
The technical scheme of the utility model has the following beneficial technical effects:
according to the system provided by the embodiment of the utility model, the electric heating molten salt system is low in electric load demand of a power grid, the peak regulation period is required to be stopped, and electric power is stored, so that the steam supply demand can be met, meanwhile, the on-line electric load can be reduced to zero, the steam supply of a waste heat boiler can be reduced, the generating capacity of a turbine generator is increased, the generating capacity of the gas turbine in the peak period is improved, and the thermoelectric decoupling of the gas turbine can be realized.
Drawings
FIG. 1 is a schematic diagram of a gas turbine decoupling system in accordance with an exemplary embodiment of the present utility model;
FIG. 2 is a schematic diagram of a gas turbine decoupling system in accordance with another exemplary embodiment of the present utility model;
FIG. 3 is a schematic diagram of an electrically heated molten salt system in an exemplary embodiment of the utility model.
Reference numerals:
1: a gas turbine; 2: a gas turbine generator; 3: a waste heat boiler; 4: a steam turbine; 5: a steam turbine generator; 6: a condenser; 7: industrial steam supply valve; 11: an electrically heated molten salt system; 12: a steam supply valve of the heat storage system; 13: a power grid high voltage power supply; 14: a step-down transformer; 15: an electric molten salt heater; 16: a low-temperature salt melting tank; 17: a high temperature salt melting tank; 18: a low temperature molten salt pump; 19: a high temperature molten salt pump; 20: molten salt steam heat exchanger.
Detailed Description
The objects, technical solutions and advantages of the present utility model will become more apparent by the following detailed description of the present utility model with reference to the accompanying drawings. It should be understood that the description is only illustrative and is not intended to limit the scope of the utility model. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the present utility model.
A layer structure schematic diagram according to an embodiment of the present utility model is shown in the drawings. The figures are not drawn to scale, wherein certain details may be exaggerated and some details may be omitted for clarity. The shapes of the various regions, layers and relative sizes, positional relationships between them shown in the drawings are merely exemplary, may in practice deviate due to manufacturing tolerances or technical limitations, and one skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions as actually required.
It will be apparent that the described embodiments are some, but not all, embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the description of the present utility model, it should be noted that the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In addition, the technical features of the different embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.
At present, a gas combined cycle generator set is used as a peak shaver set, is operated in a power consumption peak period, is stopped in a power consumption valley period, is started and stopped in the daytime, and is difficult to operate for a gas turbine power plant with heat supply requirements. To this end, the present utility model provides a gas turbine decoupling system.
The decoupling system of the gas turbine 1 provided by the embodiment of the utility model is described in detail below through specific embodiments and application scenarios thereof with reference to the accompanying drawings.
As shown in fig. 1, in a first aspect of an embodiment of the present utility model, a gas turbine 1 decoupling system is provided, which may include:
the gas turbine 1 is used for driving the gas turbine generator 2 to generate electricity by using fuel combustion and transmitting the electricity to a power grid;
a waste heat boiler 3 for generating steam by using the combustion waste heat of the gas turbine 1;
the steam turbine 4 is used for driving the steam turbine generator 5 to generate electricity by utilizing steam and supplying part of the steam to the outside; and
The electric heating molten salt system 11 is used for converting electric energy of the power grid into heat energy for storage when electricity consumption is low or electricity price enters low electricity price.
According to the system, the electric heating molten salt system 11 is low in electric load demand of a power grid, a peak regulation period is needed to be stopped, electric power is stored, the steam supply demand can be met, meanwhile, the on-line electric load can be reduced to zero, the electric load demand of the power grid is high, the steam supply of the waste heat boiler 3 can be reduced, the generated energy of the turbine generator 5 is increased, the generated energy of the gas turbine 1 in the peak period is improved, and the thermoelectric decoupling of the gas turbine 1 can be realized.
In some embodiments, when electricity consumption is low or electricity price enters low electricity price, the power generation load of the gas turbine 1 is reduced, and steam generated by the waste heat boiler 3 under the condition that the gas turbine 1 is under low load is directly supplied to the outside, when the steam generated by the waste heat boiler 3 cannot meet the demand of the outside steam supply, the electric heating molten salt system 11 is also used for heating water to generate steam to supplement the gap of the outside steam supply, and when the electric network electricity load demand is high or the electricity price is high, the electric heating molten salt system 11 releases stored heat to generate steam and supply the outside steam to replace part or all of the outside steam supplied by the waste heat boiler 3; the steam turbine 4 is used for generating power by utilizing part or all of steam generated by the waste heat boiler 3, the electric heating molten salt system 11 is used for generating heat energy by utilizing electricity of a power grid and storing the heat energy when the electric load demand of the power grid is low or the electric power enters a low electricity price, and the gas turbine 1 is stopped, and the electric heating molten salt system 11 is also used for generating steam and supplying the steam to the outside; the electric heating molten salt system 11 is also used for replacing external steam supply of the waste heat boiler 3 of the gas turbine 1 in the electricity consumption peak period.
When the gas turbine 1 of the embodiment is operated, the power plant supplies steam to the outside through steam generated by the waste heat boiler 3. When the power grid electrical load demand is low and the gas turbine 1 is required to stop and peak shaving or the electricity price enters low electricity price, the power generation load of the gas turbine 1 is partially reduced, and meanwhile, redundant electricity is stored in a heat storage medium by utilizing electrical heating, so that the power plant zero load of the gas turbine 1, which is opposite to the power grid, is reduced to zero, and the power grid demand is met; the steam generated by the waste heat boiler 3 under the low load of the gas turbine 1 is directly supplied, the electric heating molten salt system 11 is further provided with a steam supply valve 12 of the heat storage system, when the steam supply cannot meet the requirement, the electric heating molten salt system 11 performs an operation mode of storing and storing simultaneously, and the steam supply valve 12 of the heat storage system is opened to supplement the steam demand of a gap so as to meet the external steam supply requirement. In the period of high power grid electrical load demand or high electricity price, the electric heating molten salt system 11 releases the stored heat, steam is generated to externally supply steam, part or all of the waste heat boiler 3 is replaced to externally supply steam, the load of the turbine generator 5 is increased, and the generated energy of the gas turbine 1 in the peak period is improved.
In another operation mode of the embodiment, when the electric load demand of the electric network is low, the gas turbine 1 can be directly stopped when entering into low electricity prices, the electric heating energy storage device is utilized to consume low electricity of the electric network, heat is stored in the electric heating molten salt system 11, and when the electric network is low, the electric heating molten salt system is stored while discharging, so that the demand of external steam supply is met, the external steam supply of the waste heat boiler 3 of the gas turbine 1 is replaced in peak hours, the external steam supply is met, meanwhile, the power generation load of the gas turbine 1 is increased, and the generated energy of the gas turbine 1 in peak hours is improved. The electricity storage of the low-valley electricity of the power grid can be utilized to meet the steam supply in the low-valley and peak periods and also meet the steam supply requirement for 24 hours.
Thus, the depth of the gas turbine 1 or the shutdown peak shaving is met, and the external steam supply requirement of the power plant is met; and the power generation load is increased in the peak period, part of the generated energy is transferred from low-price electricity to high-price electricity, the economic benefit of the power plant is increased, and the electrothermal decoupling of the gas turbine 1 is realized.
As shown in fig. 2, in some embodiments, an industrial steam supply valve 7 is disposed between the exhaust-heat boiler 3 and the steam turbine 4, and part of steam can be led out of the external steam supply by using the industrial steam supply valve 7, and a condenser 6 is connected to the outlet of the steam turbine 4, and the condenser 6 condenses the steam into the exhaust-heat boiler 3.
In some embodiments, the heat storage medium of the electrically heated molten salt system 11 is a molten salt or a heat storage material.
The heat storage material can be solid or phase change material.
As shown in fig. 3, in some embodiments, the electrically heated molten salt system 11 includes: the electric molten salt heater 15, the high-temperature molten salt tank 17 and the low-temperature molten salt tank 16 are connected in sequence;
the electric molten salt heater 15 is connected with a power grid and is used for heating a thermal circulation medium by utilizing electric energy of the power grid;
the high-temperature molten salt tank 17 and the low-temperature molten salt tank 16 are used for storing heat energy in a heat circulation medium.
The power grid in this embodiment may be a high voltage power source, which may be, for example, a booster station, a generator outlet bus, or a utility power source.
In some embodiments, a step-down transformer 14 is also provided between the electric molten salt heater 15 and the grid;
the step-down transformer 14 is used to step down the grid voltage.
In some embodiments, a molten salt steam heat exchanger 20 is also provided between the high temperature molten salt tank 17 and the low temperature molten salt tank 16;
the molten salt steam heat exchanger 20 is used for heating water to generate steam by utilizing heat energy in the thermal circulation medium and supplying steam to the outside.
In some embodiments, a high temperature molten salt pump 19 is provided between the high temperature molten salt tank 17 and the molten salt steam heat exchanger 20;
a low-temperature molten salt pump 18 is provided between the low-temperature molten salt tank 16 and the electric molten salt heater 15.
The system of the embodiment can solve the contradiction between the shutdown peak regulation and external steam supply of the existing gas turbine 1, can realize the thermoelectric decoupling of the gas turbine 1, can meet the steam supply demand when the electric network electric load demand is low and the shutdown peak regulation time period is required, can reduce the on-line electric load to zero at the same time, can reduce the steam supply of the waste heat boiler 3 when the electric network electric load demand is high, can increase the generating capacity of the gas turbine generator 5, can improve the generating capacity of the gas turbine 1 in the peak time period, can reduce the running cost of the gas turbine 1, can increase the income, and can improve the running flexibility of the gas turbine 1.
The embodiments of the present utility model have been described above with reference to the accompanying drawings, but the present utility model is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present utility model and the scope of the claims, which are to be protected by the present utility model.
Claims (10)
1. A gas turbine decoupling system, comprising:
the gas turbine (1) is used for driving the gas turbine generator (2) to generate electricity by using fuel combustion and transmitting the electricity to a power grid;
a waste heat boiler (3) for generating steam by using the combustion waste heat of the gas turbine (1);
the steam turbine (4) is used for driving the steam turbine generator (5) to generate electricity by utilizing steam and externally supplying partial steam; and
And the electric heating molten salt system (11) is used for converting electric energy of the power grid into heat energy for storage when electricity consumption is low or electricity price enters low electricity price.
2. The gas turbine decoupling system according to claim 1, characterized in that when electricity consumption goes low or electricity price goes low, the power generation load of the gas turbine (1) is reduced and the steam generated by the waste heat boiler (3) under the condition that the gas turbine (1) is under low load is directly supplied to the outside.
3. The gas turbine decoupling system of claim 2, wherein the electrically heated molten salt system (11) is further configured to heat water to produce steam to supplement the external steam supply gap when steam produced by the waste heat boiler (3) fails to meet the external steam supply demand.
4. The gas turbine decoupling system according to claim 1, wherein the electrically heated molten salt system (11) releases stored heat to generate steam and supply steam to the outside when the electrical load demand of the electrical grid is high or the electricity price is high, and replaces part or all of the waste heat boiler (3) to supply steam to the outside;
the steam turbine (4) is used for generating electricity by utilizing part or all of steam generated by the waste heat boiler (3).
5. The gas turbine decoupling system of claim 1, wherein the electrically heated molten salt system (11) is configured to generate and store heat energy from electricity of an electrical grid when an electrical load demand of the electrical grid is low or an off-peak electricity price is entered, and the gas turbine (1) is shut down, the electrically heated molten salt system (11) being further configured to generate and supply steam to the outside;
the electric heating molten salt system (11) is also used for replacing external steam supply of the waste heat boiler (3) of the gas turbine (1) in the electricity consumption peak period.
6. Gas turbine decoupling system according to any one of claims 1-5, characterized in that the heat storage medium of the electrically heated molten salt system (11) is a molten salt or a heat storage material.
7. The gas turbine decoupling system of claim 1, wherein the electrically heated molten salt system (11) comprises: the electric molten salt heater (15), the high-temperature molten salt tank (17) and the low-temperature molten salt tank (16) are connected in sequence;
the electric molten salt heater (15) is connected with a power grid and is used for heating a thermal circulation medium by utilizing electric energy of the power grid;
the high-temperature molten salt tank (17) and the low-temperature molten salt tank (16) are used for storing heat energy in a heat circulation medium.
8. The gas turbine decoupling system of claim 7, wherein a step-down transformer (14) is further provided between the electric molten salt heater (15) and the power grid;
the step-down transformer (14) is used for reducing the power grid voltage.
9. The gas turbine decoupling system of claim 7, wherein a molten salt steam heat exchanger (20) is further provided between the high temperature molten salt tank (17) and the low temperature molten salt tank (16);
the fused salt steam heat exchanger (20) is used for heating water to generate steam by utilizing heat energy in the thermal circulation medium and supplying steam to the outside.
10. The gas turbine decoupling system of claim 9, wherein a high temperature molten salt pump (19) is provided between the high temperature molten salt tank (17) and the molten salt steam heat exchanger (20);
a low-temperature molten salt pump (18) is arranged between the low-temperature molten salt tank (16) and the electric molten salt heater (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320668337.4U CN219605411U (en) | 2023-03-29 | 2023-03-29 | Gas turbine decoupling system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320668337.4U CN219605411U (en) | 2023-03-29 | 2023-03-29 | Gas turbine decoupling system |
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| Publication Number | Publication Date |
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| CN219605411U true CN219605411U (en) | 2023-08-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202320668337.4U Active CN219605411U (en) | 2023-03-29 | 2023-03-29 | Gas turbine decoupling system |
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| CN (1) | CN219605411U (en) |
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- 2023-03-29 CN CN202320668337.4U patent/CN219605411U/en active Active
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