KR101880673B1 - Method and system for raising gas turbine power by brown gas - Google Patents

Abstract

The present invention relates to a method and a system for increasing the power of a gas turbine by using brown gas. The brown gas is already homogeneously mixed with hydrogen and oxygen, has flammability which is much wider than that of LNG, and is much faster in flame propagation speed than LNG. The brown gas is excellent in terms of temperature rise capability. Accordingly, it is possible to reduce LNG consumption. The LNG reduced in consumption is mixed and burned with a small amount of brown gas so that most of the LNG can be burned within 0.001 second and practical power conversion efficiency improvement can be achieved. According to the present invention, LNG consumption can be reduced and the LNG reduced in consumption can be replaced with brown gas. Then, the power of a gas turbine can be enhanced. In addition, carbon dioxide generation can be reduced for high-efficiency and eco-friendly gas turbine operation.

Description

TECHNICAL FIELD [0001] The present invention relates to a method and system for increasing the power of a gas turbine using Brown gas,

The present invention relates to a method and system for increasing the power of a gas turbine using brown gas, and more particularly, to a method and system for raising a gas turbine using brown gas capable of lowering power generation cost, environmental pollutants, and stability in LNG power generation .

Coal-fired power generation accounts for more than 40% by weight of electric power production in Korea.

Coal-fired power plants have the advantage of being able to construct large-scale consumer sites with little restrictions on location conditions, making transmission costs low, affording power plant construction costs, and easily controlling power generation according to demand, while greenhouse gases, , the micro dust, sulfur oxides (SOx), there is a disadvantage that causes major generation of nitrogen oxides (NOx), carbon dioxide (CO _2).

However, due to recent concerns about fine dust and secondary fine dust in coal-fired power plants, the government has suspended the operation of aging thermal power plants. As a result of the shutdown of these power plants, "The report said. Here, it is known that the secondary fine dust is produced by chemical reaction of sulfur oxide and nitrogen oxide generated in a coal-fired power plant with other substances in the air.

LNG power generation is advantageous in that it does not emit pollutants such as sulfur oxides and nitrogen oxides and that the carbon dioxide emission is 50% or more by weight compared to the coal-fired power generation, thereby being environmentally friendly.

However, LNG generation is more expensive than coal-fired power generation by more than twice the cost of power generation, resulting in high power costs, high plant construction costs to secure plant stability, and electricity tariffs. If excessive price regulation is implemented, the profitability of LNG generation companies will deteriorate.

The reason for the high power generation cost of LNG power generation is that the power conversion efficiency of the gas turbine is as low as 40% or less. For various reasons, the fundamental reason is that the combustion rate of LNG is lower than that of hydrogen, This is due to reaction delay. That is, about 40% of the LNG supplied to the power plant is burned within 0.001 second and used as power, and the remaining 60% of the LNG reacted in 0.001 ~ 0.003 second is not used as power but is released as heat.

Therefore, it is necessary to prepare measures for development that can satisfy both environmental friendliness, high efficiency and stability.

Patent Document 1: Published Patent Application No. 2006-0132179 (published on December 21, 2006)

Accordingly, it is an object of the present invention to provide a method and apparatus for increasing the efficiency of LNG generation in order to lower the electricity production cost and environmental pollutants in LNG power generation replacing coal-fired power generation, To thereby increase the power of the gas turbine.

According to an aspect of the present invention, there is provided a method of increasing the power of a gas turbine including a compressor, a combustion chamber, and a turbine, the method comprising: supplying fuel gas, Brown gas, And mixing and combusting the combustion gas, and rotating the turbine using the combustion gas generated by the combustion in the combustion chamber to produce electric power.

The fuel gas may be one selected from LNG, LPG, and Syn GAS.

The brown gas may be supplied to a gas supply line for supplying the fuel gas to the combustion chamber or an LNG supply unit for supplying the fuel gas to the gas supply line, and may be mixed with the fuel gas and then supplied to the combustion chamber.

The Brown gas may be supplied to the air supply line for supplying the compressed air to the combustion chamber, or may be supplied to the compressor after being mixed with the air.

The brown gas may be supplied to the combustion chamber simultaneously with production of the brown gas.

The brown gas is used in an amount of 30 to 70% by weight based on 100% by weight of the amount of the fuel gas, (Nm 3) of the amount corresponding to the amount of the brown gas.

The brown gas is used to replace 60 wt% of the fuel gas consumption amount based on 100 wt% of the fuel gas consumption amount, and the Brown gas heat amount (1 wt%) corresponding to 1/20 of the 60 wt% Nm < 3 >).

A power up system for a gas turbine including a compressor, a combustion chamber, and a turbine, comprising: a gas supply line for supplying fuel gas to a combustion chamber; an air supply line for supplying compressed air compressed in the compressor to a combustion chamber; And an auxiliary supply line connected to the supply line and supplying Brown gas to the gas supply line or the air supply line.

The auxiliary supply line is connected to the gas supply line, and the pressure of Brown gas of the auxiliary supply line is lower than the pressure of the fuel gas of the gas supply line.

The auxiliary supply line is connected to the air supply line.

And a brown gas generator for producing brown gas by electrolyzing water. The brown gas is supplied to the combustion chamber simultaneously with production of the brown gas.

For example, the Brownian gas capacity for an 80 MW gas turbine is 480 Nm3 / h (± 10%), which is ideal for power lift efficiency.

The gas turbine can be applied to an LNG combined cycle power plant using LNG as fuel gas.

A method of increasing the power of a gas turbine including a compressor, a combustion chamber, and a turbine, wherein LNG and Brown gas are mixed with fuel supplied to the combustion chamber so that most of the fuel in the combustion chamber is combusted within 0.001 second.

The fuel contains 40 wt% of LNG based on 100 wt% of the amount of the LNG, and 1 wt% of the 60 wt% LNG calories (Nm 3) removed by using the 40 wt% of LNG. Gas is mixed.

The Brown gas is supplied to a gas supply line for supplying the LNG to the combustion chamber or to an LNG supply unit for supplying LNG to the gas supply line to mix the LNG with the LNG or to supply the compressed air compressed by the compressor to the combustion chamber Line or the compressor to mix with the air and supply the mixture to the combustion chamber.

In the present invention, Brown gas is mixed with LNG (LPG, Syn gas) and Brown gas, hydrogen and oxygen are already homogeneously mixed with hydrogen-oxygen mixed gas, and flammability and flammability which are much wider than LNG It has a flame propagation speed and excellent temperature rise ability.

As Brown's gas has excellent power generation capability, Brown gas is used to eliminate 60% of the existing LNG consumption, and a small amount of brown gas is mixed with 40% LNG to burn the LNG within 0.001 second. .

As described above, the present invention increases the power of the gas turbine by replacing the LNG which is reduced in the amount of LNG used and the amount of used LNG by Brown gas, so it can be applied to the LNG power generation to reduce the fuel cost and increase the power production efficiency of the LNG power generation, There is an effect that can be saved.

In addition, the present invention can reduce the amount of carbon dioxide generated in proportion to the amount of LNG reduction, and thus has a more environment-friendly effect compared to the case where only LNG is used.

In addition, the present invention can reduce the amount of heat of the exhaust gas by prolonging the life of the turbine blades and enhancing the stability of the LNG power generation facility because the power of the LNG and Brown gas is switched to the power in a short time during the mixed combustion. It is effective.

1 is a view for explaining a method of increasing the power of a gas turbine using Brown gas according to an embodiment of the present invention.
FIG. 2 is a view for explaining a method of increasing the power of a gas turbine using Brown gas according to another embodiment of the present invention. FIG.
3 is a graph showing the ideal power production range within 7 degrees of crank angle of the engine to account for power conversion and heat loss associated with flame propagation speed.
FIG. 4 is a graph comparing turbine efficiency and turbine efficiency when a part of LNG is replaced with brown gas when only LNG is used.
FIG. 5 is a graph showing the fuel cost and the amount of carbon dioxide generated when the 100% LNG is used in an 80 MW gas turbine and the 60% LNG is replaced with Brown gas.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram illustrating a method for increasing the power of a gas turbine using Brown gas according to an embodiment of the present invention.

1, a method of increasing the power of a gas turbine using Brown gas according to the present invention is a method for increasing the power of a gas turbine 100 including a compressor 110, a combustion chamber 120, and a turbine 130, The method comprising the steps of: supplying fuel gas, Brownian gas, and compressed air compressed by the compressor 110 to the combustion chamber 120 to be mixed and combusted; rotating the turbine 130 using the combustion gas generated by the combustion in the combustion chamber 120; .

In the gas turbine 100, the compressor 110 sucks and compresses the air, and the compressed air compressed in the compressor 110 is supplied to the combustion chamber 120. The compressed air supplied to the combustion chamber 120 causes a mixed combustion reaction with the fuel supplied to the combustion chamber 120. The combustion gas generated by the combustion reaction in the combustion chamber 120 acts as a power for rotating the turbine. Rotation of the turbine 130 drives the compressor 110 and produces power in the generator 200 connected to the turbine 130.

The electric power generated by the generator 200 may be sent to the substation 500 and then supplied to the domestic or industrial electric power using the transmission line 600.

In this process, combustion of a strong explosive force is performed within a few seconds (0.001 second) in the combustion chamber 120 by using LNG and Brown gas as the fuel supplied to the combustion chamber 120 of the gas turbine 100, Thereby increasing the rate at which the combustion gas generated by the turbine 130 is converted into power for rotating the turbine 130.

The combustion reaction in the combustion chamber 120 within a few seconds (0.001 second) must occur so that the combustion gas by the combustion reaction is converted into the power in a short period of time without being wasted by the heat of the exhaust gas and converted into the power for rotating the turbine. When the combustion gas by the combustion reaction is converted into power for rotating the turbine in a short time, the heat of the exhaust gas is reduced and the blade life of the turbine is also prolonged.

The fuel gas may be one selected from the group consisting of LNG, LPG, and Syn GAS.

More specifically, the gas turbine 100 is applied to LNG power generation, which replaces coal-fired power generation, so that the efficiency of LNG power generation can be increased by increasing the power, thereby lowering the power generation cost.

Liquefied natural gas (LNG) is liquefied methane (CH ₄ ) obtained by refining natural gas in a gas field. LNG is a colorless, transparent liquid. It has almost no pollutants in addition to CO ₂ and has a high heat capacity.

The LNG can be supplied from the LNG supply unit 300. The LNG supply unit 300 may be a natural gas tank.

Brown gas is included to replace LNG to improve LNG generation efficiency.

Brown gas can increase the flame temperature and increase the flame propagation speed so that a rapid combustion reaction can occur within a few seconds (0.001 second) in the combustion chamber 120.

Furthermore, when Brown gas is mixed with other fuels (eg, LNG), the flame temperature rises and combustion simultaneously occurs simultaneously in a short period of time, resulting in a combustion reaction of strong explosive power, thereby enhancing power up efficiency.

Brown gas is a mixed gas of hydrogen and oxygen which is made by electrolysis of water in a ratio of 2: 1. Brown gas is an ideal mixed gas that is completely burned by its own oxygen, and it has unique combustion characteristics of Brown gas alone, so it does not emit pollutants such as CO ₂ , dioxin and SOx during combustion.

Brown gas is supplied to the combustion chamber 120 at the same time as it is produced in the brown gas generator 400.

The brown gas generator 400 generates brown gas by receiving water and electricity, and electricity can be supplied from the generator 200 or another power company.

Brown gas produced by the brown gas generator 400 can be supplied to the combustion chamber 120 at a low pressure of 1.8 bar or less and preferably at a low pressure of 1.2 bar without being compressed and stored, It is free from explosion hazard, safe and can operate at large capacity.

Brown gas may explode when compressed, so it is not desirable to store brown gas in a storage tank before transporting it. In order to produce electricity, it is necessary to operate brown gas at a large capacity, so it is important that the brown gas generator is connected to the combustion chamber 120 to supply brown gas simultaneously with production.

For example, the Brown gas generator 400 is capable of operating continuously for 365 days, and when the Brown gas capacity is 480 Nm 3 / h (± 10%) based on the 80 MW gas turbine, the power raising efficiency is high.

Specifically, the capacity of the brown gas generator 400 is set to 480 Nm 3 / h (± 10%), that is, 480 Nm 3 / h ± 48 Nm 3 / h, based on the 80 MW gas turbine. It is possible to increase the capacity of the brown gas generator in proportion to the use of the brown gas generator.

The Brown gas may be supplied to the gas supply line 140 for supplying the fuel gas to the combustion chamber 120 and may be mixed with the fuel gas and then supplied to the combustion chamber 120.

When brown gas is mixed with the fuel gas and supplied to the combustion chamber 120, the brown gas serves as a primer for causing the fuel gas to burn within a few seconds, thereby increasing the combustion efficiency. However, if brown gas is directly supplied to the combustion chamber 120 without mixing with the fuel gas, brown gas having a high burning rate before combustion of the fuel gas is combusted first, thereby failing to serve as a primer for increasing the combustion efficiency of the fuel gas. .

Therefore, it is important to homogeneously mix the Brown gas with the fuel gas before supplying it to the combustion chamber 120. The homogeneous mixing of brown gas and fuel gas is intended to increase the combustion efficiency and to burn rapidly.

To this end, the gas supply line 140 includes an auxiliary supply line 160 connected to the gas supply line 140 for supplying Brown gas. The Brown gas pressure of the auxiliary supply line 160 is supplied to the gas supply line 140) so that Brown gas can flow smoothly into the gas supply line (140).

For example, the LNG is supplied to the gas supply line 140 and the Brown gas is supplied to the gas supply line 140 at a pressure of 1.2 bar through the auxiliary supply line 160, so that Brown gas is supplied to the gas supply line 140, To be smoothly and homogeneously mixed with the flowing LNG.

In another example, the Brown gas may be supplied to the LNG supply unit 300, mixed with the LNG, and then supplied to the combustion chamber 120 through the gas supply line 140.

The brown gas is used in an amount of 30 to 70% by weight based on 100% by weight of the fuel gas consumption, which is equivalent to 1/30 to 1/25 of the calorific value (Nm 3) of the fuel gas, Brown gas calories (N㎥).

If brown gas is replaced by less than 30 wt% of the fuel gas consumption, the effect of increasing the turbine efficiency is insufficient. If the brown gas is replaced by more than 70 wt% of the fuel gas consumption, the turbine efficiency may be lowered and economically inefficient.

At this time, brown gas is replaced by the heat amount (Nm 3) corresponding to 1/15 to 1/25 of the fuel gas heat amount (Nm 3), which is a value considering the error range by theoretically calculating the brown gas power generation effect.

Preferably, the Brownian gas is replaced by 60% by weight of the fuel gas, based on 100% by weight of the fuel gas consumption amount, and the heat amount (Nm 3) corresponding to 1/20 of the heat amount (Nm 3) .

Brown gas has the highest turbine efficiency when it replaces 60% by weight of LNG.

For example, when the amount of LNG used is 100% by weight, 40% by weight of LNG and 40% by weight of LNG, (Water decomposition gas) is preferably used.

Turbine efficiency is more than two times higher than that of LNG alone when mixed with 40% by weight LNG and 60% by weight LNG (Nm 3) of heat energy (N㎥) This is due to the assumption that the brown gas power generating effect is 20 times the LNG, which will be described in detail later.

FIG. 2 is a block diagram illustrating a method of increasing the power of a gas turbine using Brown gas according to another embodiment of the present invention. In Fig. 2, only the difference from Fig. 1 will be described.

2, the method of increasing the power of a gas turbine using Brown gas of another embodiment differs from that of the first embodiment in that Brown gas is mixed with compressed air and supplied to the combustion chamber 120. [

Concretely, Brown gas is supplied to the air supply line 150 for supplying the compressed air to the combustion chamber 120, mixed with the compressed air, and then supplied to the combustion chamber 120.

When brown gas is mixed with compressed air and supplied to the combustion chamber 120, the brown gas is not influenced by the nitrogen contained in the LNG, so that the combustion reaction can be performed directly without delaying the combustion time in the combustion chamber.

That is, when brown gas is mixed with compressed air and supplied to the combustion chamber, there is no nitrogen for preventing oxidation, so combustion in the combustion chamber can proceed faster than in the embodiment.

As another example, the Brown gas may be supplied to the compressor 110 through the air supply line 150 after being mixed with the air. Brown gas is explosive when compressed, but Brown gas does not explode to the extent that it compresses air in compressor (110).

Referring to FIGS. 1 and 2, a gas turbine power up system for implementing a power up method of a gas turbine using Brown gas is provided with a gas supply line 140 for supplying fuel gas to the combustion chamber 120 An air supply line 150 for supplying the compressed air compressed by the compressor 110 to the combustion chamber 120 and a gas supply line 140 connected to the gas supply line 140 or the air supply line 150, Or an auxiliary supply line 160 for supplying Brown gas to the air supply line 150.

A main valve 141 is provided in the gas supply line 140 to control the supply pressure and supply amount of the fuel gas and the air supply line 150 is provided with a control valve 151 to control the supply amount of the compressed air And the auxiliary supply line 160 is provided with a regulating valve 161 to control the supply amount of the brown gas.

In one embodiment, the auxiliary supply line 160 may be connected to the gas supply line 140 such that Brown gas is mixed with the fuel gas and supplied to the combustion chamber 120. In this case, the Brownian gas pressure of the auxiliary supply line 160 is lower than the pressure of the fuel gas of the gas supply line 140.

In another embodiment, the auxiliary supply line 160 may be connected to the air supply line 150 such that brown gas is mixed with compressed air and supplied to the combustion chamber 120.

(Not shown) for controlling the operation of the main valve 141, the control valve 151, the control valve 161, and the brown gas generator 400. [ The control unit controls operations of the main valve 141, the control valve 151, the control valve 161 and the Brown gas generator 400 according to a predetermined program so that the gas turbine 100 can be operated efficiently .

The gas turbine 100 is preferably applied to an LNG combined cycle power plant using LNG as fuel gas. However, the gas turbine 100 may be applied to a power plant using LPG as fuel gas, and a power plant using LNG and coal as a mixture.

Hereinafter, a method for raising a gas turbine power using Brown gas according to the present invention will be described.

The fuel gas is exemplified by a mixture of LNG and Brown gas.

First, Brown gas is considered to be suitable for the increase of gas turbine power. First, brown gas is already mixed with hydrogen and oxygen, so there is no combustion time delay required for turbulent mixing. .

[Equation 1]

)- RR ₁ : Vaporization rate of liquid phase fuel atomization

)

- RR ₂ : turbulent mixing rate (eg 10)

- RR ₃ : Chemical reaction rate (eg 100)

Equation 1 represents the reaction rate. The reason why TNT explodes solidly and instantaneously is that oxygen is already mixed and combustion occurs immediately. However, since the gas, brown gas, is already mixed with hydrogen and oxygen, the burning rate is much faster than that of solid TNT.

Second, the heating capacity of brown gas is at least twice that of LNG.

Brown gas has about twice the capacity to burn combustion gas (combustion gas) than LNG.

(1) hydrogen combustion gas

Formula 2) LNG (composition ratio of _{90% CH 4/10% C} 3 H 8) gas combustion

According to Formula (1), 1 moles of water vapor is generated per 1 mole of hydrogen combustion gas, and the low calorific value at this time is 0.24 MJ, so that it has a heat amount of 0.24 MJ per mole of combustion gas.

Brown gas has 2/3 of the total amount of hydrogen, so the brown gas low calorific value is 0.16MJ.

According to the formula (2), 0.8 MJ of heat is generated in the combustion gas of 10.5 mol (1 + 2 + 7.5 = 10.5) of LNG.

Therefore, the amount of heat that can be used to raise the temperature per 1 mole of combustion gas in the combustion of hydrogen and LNG is shown in Table 1 below.

fuel Generation confiscation Low calorific value Calories used for heating per 1 mole of combustion gas Remarks LNG (CH ₄₎ 10.5 0.80MJoule 0.076 MJoule / mole Brown gas can heat 2.1 times more than LNG

Brown gas One 0.16MJoule 0.16 MJoule / mole Simple comparison of heat capacity by calorie 0.16 / 0.076? 2.1 times

According to Table 1, it is confirmed that the heating capacity of Brown gas is at least twice that of LNG.

Third, the flame propagation speed of hydrogen in air is about 8 times that of LNG, but brown gas is combustion of hydrogen and oxygen in the absence of nitrogen, so the flame propagation speed is at least 110 times faster.

Table 2 below compares flame propagation rates of hydrogen, LNG, and brown gas.

fuel
Hydrogen
_{LNG (CH 4: C 3 H} 8 = 9: 1) Brown Gas (HHO)
(H: O = 2: 1)
CH ₄ C ₃ H ₈ Flame Propagation Rate during Combustion in Air 230 cm / sec 35 cm 38 cm / sec 4,110 cm / sec
Flame propagation speed about 114 times faster than LNG

According to Table 2, the flame propagation velocity of brown gas is 110 times faster than that of LNG. Brown gas, which has a flame propagation speed more than 110 times faster than LNG, is mixed with LNG and injected into the combustion chamber. Hydrogen with low ignition temperature acts as a primer to propagate the flame at high speed, thereby enhancing the combustion efficiency of LNG.

When the brown gas is mixed and combusted in the LNG at the same time as the above-mentioned effects are simultaneously generated, a large amount of mixed gas is rapidly burned within a short time (within 0.001 second), and at least 20 times (in theory, 162 Power increase effect of the power source is generated.

Based on the above results, it is assumed that the brown gas power generation effect is 20 times that of LNG.

The power boosting aspect, which results in rapid combustion of a large amount of mixed gas within a short period of time and leads to a power increase, is illustrated in FIG.

FIG. 3 is a graph showing the ideal power production range within 7 degrees of the crank angle of the engine to account for power conversion and heat loss associated with the flame propagation velocity.

According to FIG. 3, in the case of the engine, the combustion reaction occurs within 7 degrees of the crank angle to increase the probability of conversion into power, and the reaction thereafter is simply wasted as heat of the radiator or exhaust gas.

For example, a combustion reaction must occur in an engine within 0.001 second, which is ideal for power generation. Approximately 60% of the fuel reacts in 0.001 to 0.003 seconds and a large amount of energy is released (lost) to the heat.

When the present invention is applied to the present invention, when a combustion reaction occurs in which most of the fuel in the combustion chamber is mixed with LNG and Brown gas as the fuel supplied to the combustion chamber, the combustion reaction of strong explosive force occurs and the combustion gas rotates the turbine And the ratio of switching to the driving force is increased.

The higher the rate at which the flue gas is converted into the power to rotate the turbine, the less heat loss and waste heat is lost, thus extending the turbine blade life.

The combustion reaction in the combustion chamber in less than 0.001 second can be performed by rapidly burning a large amount of fuel gas (eg, LNG) by interaction of the brown gas's reaction rate, heating capacity, and flame propagation speed.

Fig. 4 compares turbine efficiency and turbine efficiency when Brown gas is substituted for a portion of LNG in the case of using only LNG.

According to FIG. 4, when the turbine efficiency is about 30% when the gas turbine is operated using only LNG, the turbine efficiency gradually increases when a part of the LNG is replaced by Brown gas. When 60% of the LNG is replaced by Brown gas Turbine efficiency was the highest at about 70%.

From the above-mentioned results, it is found that Brown's gas has a brown gas heat amount (Nm < 3 >) corresponding to 1/20 of the heat amount (Nm 3) of 60 wt% LNG, ), It can be seen that the turbine efficiency can be maximized.

 Here, assuming that Brown gas power generating effect is 20 times that of LNG, the actual amount of brown gas to be input is made to be 1/20 of the subtracted LNG heat amount according to the LNG subtraction.

In order to facilitate the understanding of the explanation, when the gas turbine power up method using brown gas of the present invention is applied to an 80 MW gas turbine, the fuel cost reduction and the carbon dioxide generation reduction effect are theoretically calculated. For reference, the current capacity of 80 MW gas turbine (LNG consumption: 16,000 Nm3-LNG / h), which is the smallest capacity used in LNG power generation, is calculated.

1) 60% LNG savings / year: about 42 billion 48 million won / year

9,600 Nm3-LNG / h x 500 yuan / Nm3-LNG x 24h / day x 365 days / yr = 42,048 million yuan / year

(Here, 9,600N㎥ is the calories of LNG (hourly gas consumption), and 500L / N㎥ is the price of purchasing LNG from the government.)

2) Brown gas (HHO) production cost (power + water): about 1,178 million won / year

- Electricity cost: about 1,176 million won / year

480 Nm3-HHO / h x 4.4 kWh / Nm3-HHO x 63.53 yuan / kW x 24h / day x 365 days / year

= 1,176 million won / year

(Here, 480Nm3 is calculated as 1/20 of the heat equivalent to 60% of LNG, and 63.53won / kW is based on the basic charge for industrial electric power.)

- Water usage and price: 2 million won / year or less

240 liters / h × 24 hours / day × 365 days / year × 890 won / 1,000 liters = 2 million won / year or less

(Here, 240 liters / h is based on tap water, and 890 won / 1,000 liters is based on tap water cost in Gyeonggi Province.)

3) Reduction of CO2 emissions and CDM revenues from 60% LNG reduction

9,600N㎥-LNG / h × 2.256kg- CO 2 /N㎥-LNG/h≒21.1 tone -CO ₂ / h

21.1 tons - CO ₂ / h × 23,700 won / ton × 24 days × 365 days / year ≒ 4,497 million won / year

From the above calculations, it can be concluded that the use of 60% LNG in an 80 MW gas turbine is reduced and replaced with brown gas. When the fuel cost is 100% LNG, about 708 million Won / year (LNG 40% + Brown gas) It can be seen that the fuel cost can be reduced by about 40.87 billion Won / year and the amount of carbon dioxide emission can be reduced by about 21.1 tons by reducing to 29.21 billion Won / year.

FIG. 5 graphically shows the fuel cost and the amount of carbon dioxide produced when 100% LNG is used in an 80 MW gas turbine and 60% LNG is replaced with Brown gas.

As shown in FIG. 5 (a), when the Brown gas is used for the LNG power generation, the amount of LNG is reduced and replaced with brown gas, thereby reducing the fuel cost and thus the power generation cost .

As shown in FIG. 5 (b), the gas turbine power raising method using brown gas described above can reduce the amount of carbon dioxide generated in proportion to the amount of LNG reduction when applied to LNG power generation.

In addition, when mixed combustion of LNG and Brown gas, the homogeneous mixing effect between fuel and oxidizer and the strong explosive power of Brown gas are converted into power in a short time in a high temperature region, thereby reducing the heat of exhaust gas and extending the life of turbine blades The stability of LNG power generation facilities can be enhanced.

In addition, the above-described method of increasing the power of the gas turbine using Brown gas can be applied to LNG power generation to improve the power generation efficiency and to reduce the power generation unit cost, so that the LNG power generation can contribute to reduce the coal power generation.

Reduction of coal-fired power plants can reduce the generation of fine dust such as nitrogen oxides (NOx) and reduce secondary fine dust due to fine dust reduction.

As described above, it can be understood that the method of increasing the power of the gas turbine using Brown gas according to the present invention is applied to the LNG power generation, thereby lowering the power generation cost and improving the environment.

Best Mode for Carrying Out the Invention The present invention has been described with reference to the drawings and the specification. Although specific terms are used herein, they are used for the purpose of describing the present invention only and are not used to limit the scope of the present invention described in the meaning of the claims or the claims. Therefore, it is to be understood that the present invention may be embodied in many other specific forms without departing from the spirit or essential characteristics thereof. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

100: gas turbine 110: compressor
120: combustion chamber 130: turbine
140: gas supply line 141: main valve
150: air supply line 151: control valve
160: auxiliary supply line 161: regulating valve
200: generator 300: LNG supply unit
400: brown gas generator 500: substation
600: Transmission line

Claims (16)

It is applied to LNG power generation that replaces coal-fired power generation,
A power up method of a gas turbine including a compressor, a combustion chamber and a turbine,
Fuel gas, brown gas, and compressed air compressed by the compressor are supplied to the combustion chamber to be mixed and combusted; And
Rotating the turbine and generating electric power using combustion gas generated by combustion in the combustion chamber;
Lt; / RTI >
The fuel gas is LNG,
In order to maximize the probability of the combustion reaction occurring in the combustion chamber within 0.001 second by using LNG and Brown gas as the fuel gas supplied to the combustion chamber,
The brown gas is supplied to the combustion chamber at the same time as the brown gas generator is produced. The brown gas generator is supplied with power generated from a generator connected to the turbine,
The brown gas
Based on the fuel gas usage amount of 100% by weight,
30 to 70% by weight of the amount of the fuel gas is replaced,
(Nm 3) corresponding to 1/15 to 1/25 of the calorific value (Nm 3) of the 30 to 70 wt% fuel gas. delete The method according to claim 1,
Wherein the brown gas is supplied to a gas supply line for supplying the fuel gas to the combustion chamber or an LNG supply unit for supplying the fuel gas to the gas supply line and mixed with the fuel gas and then supplied to the combustion chamber A Method for Elevating Gas Turbine Power Using Brown Gas. The method according to claim 1,
Wherein the brown gas is supplied to the air supply line for supplying the compressed air to the combustion chamber or to the combustion chamber after being supplied to the compressor and mixed with the air. delete delete The method according to claim 1,
The brown gas
Based on the fuel gas usage amount of 100% by weight,
Replacing 60 wt% of the fuel gas consumption,
(Nm 3) corresponding to 1/20 of the calorific value (Nm 3) of the 60 wt% fuel gas. A power up system for a gas turbine comprising a compressor, a combustion chamber and a turbine,
A gas supply line for supplying the fuel gas to the combustion chamber;
An air supply line for supplying the compressed air compressed in the compressor to the combustion chamber; And
An auxiliary supply line connected to the gas supply line or the air supply line to supply Brown gas to the gas supply line or the air supply line;
/ RTI >
And a brown gas generator for electrolyzing water to produce the brown gas,
The brown gas generator receives the electric power generated by the generator connected to the turbine to produce the brown gas,
The brown gas is supplied to the combustion chamber simultaneously with production of the brown gas generator,
The Brown gas generator has a capacity of 480 Nm 3 / h ± 48 Nm 3 / h based on an 80 MW gas turbine,
Wherein the gas turbine is applied to an LNG combined cycle power plant using LNG as a fuel gas. The method of claim 8,
The auxiliary supply line is connected to the gas supply line,
Wherein the Brown gas pressure of the auxiliary supply line is lower than the pressure of the fuel gas of the gas supply line. The method of claim 8,
And the auxiliary supply line is connected to the air supply line. delete delete delete delete delete delete

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