KR102168472B1 - Generation system utilizing coal gasification syngas and FT reaction off-gas - Google Patents

Abstract

The present invention is a coal gasifier for generating syngas using coal; An FT reaction unit receiving syngas from the coal gasification unit and producing industrial fuel through an FT reaction; And a first power generation unit that generates electricity by receiving syngas from the coal gasification unit and driving a co-fired engine using a compression ignition method, and unused off-gas that does not participate in the FT reaction is supplied from the FT reaction unit to ignite sparks. A power generation unit including a second power generation unit for generating electricity by driving a power plant engine using a method; Consisting of including, it relates to a power generation system capable of generating power with high efficiency by utilizing off-gas discarded in the process of producing industrial fuel by gasification of coal and FT reaction.

Description

Power generation system utilizing coal gasification syngas and FT reaction off-gas {Generation system utilizing coal gasification syngas and FT reaction off-gas}

The present invention relates to a technology for generating power by utilizing both low-heat syngas generated in a coal gasification process and off-gas discarded in the process of producing industrial fuel through gasification of coal and FT reaction.

Thermal power generation technology using coal is a technology that generates steam by directly burning coal and turns a turbine with this steam to generate power, and is one of the traditional power generation technologies. While thermal power generation is a fairly efficient power generation technology, there is a problem that has a large adverse effect on the environment due to the large amount of waste by-products such as harmful exhaust gas. While solving these problems, studies to further develop the merits of thermal power generation have been continuously conducted, and as part of this research, the Integrated Gasification Combined Cycle technology is gradually expanding.

Coal gasification combined cycle power generation means converting coal into syngas containing hydrogen (H ₂ ) and carbon monoxide (CO) as the main components, and then removing harmful substances such as dust and sulfur oxides contained in the synthesis gas. It is a technology that performs complex power generation by purifying to a level similar to that of gas. Coal gasification combined power generation technology has higher power generation efficiency than classical coal-fired power generation technology, and is an eco-friendly technology that can reduce sulfur oxides by 90% or more, nitrogen oxides by 75% or more, and carbon dioxide by 25% compared to direct combustion power generation. For this reason, countries around the world are working hard on development. Korea Patent Publication No. 2014-0139314 ("Coal gasification power generation facility using a fixed bed gasifier", 2014.12.05), etc., such a coal gasification complex power generation technology is variously disclosed.

Syngas generated in the coal gasification process is used for various purposes. In particular, it is possible to produce fuels (diesel, kerosene, gasoline, etc.) that can be used generally through FT (Fischer & Tropsh) reaction. At this time, unused gas (off-gas) is generated by participating in the FT reaction, and the calorific value of off-gas is about 1/5 to 1/10 compared to diesel or gas fuel used for general generators. Since it has a calorific value of, it is known that even if it is unburned or burned, its thermal efficiency is very low, and thus it is not suitable to be used as a fuel for power generation. Accordingly, conventionally, all of these off-gases are discarded, causing a problem of lowering the overall system efficiency.

Meanwhile, the syngas generated in the coal gasification process may be used to produce industrial fuel by performing the FT reaction as described above, or may be used for power generation by direct combustion. However, depending on the concentration of oxygen injected for the gasification process, syngas having a low calorific value that cannot be used for the FT reaction is sometimes produced. As such, when the syngas that has not been used for the FT reaction cannot be used for other purposes and is discarded, there is a problem that the system efficiency is also greatly reduced.

1. Korean Patent Publication No. 2014-0139314 ("Coal gasification power generation facility using fixed bed gasifier", 2014.12.05)

The present invention was conceived to solve the above-described problems, and an object of the present invention is to be discarded in the process of producing industrial fuel by gasification and FT reaction of low-calorie synthesis gas generated in the coal gasification process. It is to provide a power generation system capable of high-efficiency power generation through stable combustion by utilizing all off-gas.

The power generation system using the coal gasification syngas and FT reaction off-gas of the present invention for achieving the above object comprises: a coal gasifier for generating syngas using coal; An FT reaction unit receiving syngas from the coal gasification unit and producing industrial fuel through an FT reaction; And a first power generation unit that receives syngas from the coal gasification unit and drives the engine to generate electricity, and an ignition engine using a spark ignition method by receiving unused off-gas not participating in the FT reaction from the FT reaction unit. A power generation unit including a second power generation unit for generating electricity by driving; It can be made including.

In addition, the power generation unit may generate power by selectively operating one of the first power generation unit and the second power generation unit according to a component of the syngas generated by the coal gasification unit.

In addition, a solar power generation unit for generating power using solar light; And an electrolysis device receiving electricity from the photovoltaic power generation unit and supplying oxygen obtained by electrolyzing water to the coal gasification unit and supplying hydrogen to the FT reaction unit. It may be made including more.

In addition, during the day, oxygen and hydrogen generated using the photovoltaic power generation unit and the electrolysis device are supplied to generate synthesis gas and FT reaction, and electricity can be generated in the second power generation unit using off-gas.

In addition, at night, air is supplied to the coal gasification unit to generate syngas, and electricity can be generated in the first power generation unit by using the generated syngas.

In addition, the combustion engine may have a compression ratio of 13:1 to 15:1.

In addition, the burning engine may be operated with a theoretical air fuel efficiency.

In addition, the second power generation unit, the first three-way catalyst installed in the exhaust pipe of the power plant engine to remove harmful gases contained in the exhaust gas; A front oxygen sensor installed in an exhaust pipe in front of the first three-way catalyst and a rear oxygen sensor installed in an exhaust pipe behind the first three-way catalyst in the flow direction of the exhaust gas; And a control unit connected to the burner engine, the front oxygen sensor and the rear oxygen sensor to control the burnout engine. The burnout engine may be operated in a lean state in which the average of the excess air ratio λ is higher than 1.00.

In addition, the burning engine may be operated within a range in which the average of the excess air ratio λ is greater than 1.018 and less than 1.022.

In addition, the second power generation unit may further include a second three-way catalyst installed in an exhaust pipe behind the rear oxygen sensor in a flow direction of the exhaust gas to remove harmful gases contained in the exhaust gas.

In addition, the second power generation unit may further include a nitrogen oxide sensor installed in an exhaust pipe behind the rear oxygen sensor in the flow direction of the exhaust gas.

In addition, the first power generation unit may be a Hon-so engine generator using a compression ignition method.

According to the present invention, there is an advantage in that power generation with high efficiency can be achieved by utilizing both the low-heat syngas generated in the coal gasification process and the off-gas discarded in the process of producing industrial fuel through gasification of coal and FT reaction. . More specifically, according to the present invention, industrial fuels such as diesel, kerosene, gasoline, etc. are produced through coal gasification and FT reaction, and at the same time, all by-products generated in this process are utilized for power generation, thereby improving coal use efficiency. It can be maximized. In particular, according to the present invention, there is an advantage of maximizing power generation efficiency by combusting synthesis gas and off-gas having a difference in hydrogen concentration in an optimized manner for power generation.

As described above, according to the present invention, it is possible to obtain an effect of improving the system efficiency by utilizing both the syngas having a low calorific value that is not used for the FT reaction and the off-gas generally discarded for power generation. In addition, according to the present invention, there is also an eco-friendly effect that can significantly reduce the amount of harmful gas generated compared to a conventional diesel-powered engine for power generation by using such syngas.

1 is a block diagram showing a power generation system using coal gasification syngas and FT reaction off-gas according to an embodiment of the present invention.
2 is a schematic diagram showing a second power generation unit according to an embodiment of the present invention.
3 is a graph showing the thermal efficiency according to the compression ratio and the excess air ratio (λ) of the burning engine in the second power generation unit of the power generation system using the coal gasification syngas and FT reaction off-gas according to an embodiment of the present invention. .
FIG. 4 is a graph showing the concentration of harmful gases in exhaust gas in a state in which the burnout engine is controlled by a theoretical air fuel ratio using a front oxygen sensor, a rear oxygen sensor, and a first three-way catalyst in a second power generation unit according to an embodiment of the present invention. to be.
Figure 5 is a second power generation unit according to an embodiment of the present invention using a front oxygen sensor, a rear oxygen sensor, and a first three-way catalyst, but the average of the air excess ratio (λ) is about 1.02 slightly higher than 1.00 It is a graph showing the concentration of harmful gas in exhaust gas under the control to operate in a lean state.
6 is a concentration of harmful gas in exhaust gas in a state in which the air-fuel ratio is controlled using a front oxygen sensor, a rear oxygen sensor, a first three-way catalyst, and a nitrogen oxide sensor in a second power generation unit according to an embodiment of the present invention. It is a graph showing.

Hereinafter, a power generation system using the coal gasification synthesis gas and FT reaction off-gas of the present invention as described above will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing a power generation system using coal gasification syngas and FT reaction off-gas according to an embodiment of the present invention.

Referring to Figure 1, the power generation system using the coal gasification synthesis gas and FT reaction off-gas according to an embodiment of the present invention, largely a coal pretreatment unit 10, a solar power generation unit 15, an electrolysis device ( 16), consisting of a power generation unit 50 including a coal gasification unit 20, a syngas cleaning unit 30, an FT reaction unit 40, a first power generation unit 51 and a second power generation unit 52 Can be.

The coal pretreatment unit 10 is a part that enables the supply of coal to the coal gasification unit 20 after increasing the ratio of fixed carbon by pretreating coal. In more detail, coal is mainly composed of flammable components such as fixed carbon and volatile components, and non-combustible components such as moisture, ash and other minerals. Fixed carbon is the main component of coal utilization, and the higher the ratio of fixed carbon is, the higher the calorific value and conversion efficiency are. Volatile components are produced in large quantities when the degree of carbonization is low, and combustion is difficult when the ratio of volatile components is high. In particular, since ash is a component that greatly reduces the calorific value and conversion efficiency of coal, pretreatment of coal is necessary in order to utilize low-grade coal. In addition, the run of mine coal contains a mixture of pure coal with high fixed carbon content and gangue, which is the destruction stone of rock.If gangue is contained in the normal coal, the amount of heat decreases during the combustion process of the normal coal and harmful gases Because (SOx) is a cause of generation, pretreatment of coal is required before supplying the coal to the coal gasifier.

The photovoltaic power generation unit 15 is a part that generates electricity using sunlight, and can generate power using sunlight during the day using solar cells.

The electrolysis device 16 is a part that receives electricity from the photovoltaic power generation unit 15 and electrolyzes water to generate oxygen and hydrogen, and the generated oxygen is supplied to the coal gasification unit 20 and the hydrogen is subjected to an FT reaction. It can be supplied to the part 40.

The coal gasification unit 20 is a part that generates syngas using coal. More specifically, in the coal gasification unit 20, heat and syngas (CO, H ₂ ) through a gasification process of reacting coal, low-grade residual oil, industrial waste, biomass, etc., which are substances composed of hydrocarbons, with oxygen or steam, etc. ). Here, the gasification reaction is not a single reaction, but drying in which moisture is removed from a solid hydrocarbon material near 100°C, pyrolysis in which solid volatile components are removed in the range of 350°C to 550°C, and heat by reacting carbon and oxygen from 500°C or higher. It is a complex reaction that occurs sequentially or simultaneously, such as combustion to create a gas and a gasification reaction to generate syngas. After pyrolysis, solid hydrocarbons are converted into char consisting only of hydrocarbon substances and ash, and heat is required to react the charcoal. In addition, when steam and oxygen are used as gasifiers, the generated synthesis gas is mainly CO and H ₂ , which is a medium-calorie gas (around 3,000 kcal/m ³ ) with relatively high calorific value. If air is used instead of oxygen, it is The nitrogen component is increased to become a low-calorie gas (around 1,000 kcal/m ³ ) with a low calorific value. In addition, the sulfur and nitrogen components contained in the solid hydrocarbon react with hydrogen or carbon monoxide through a gasification reaction, and are converted into H ₂ S, COS, CS ₂ , and NH ₃ to form a compound in a different form from the gas discharged by combustion. .

The syngas cleaning unit 30 is a part that removes foreign substances or harmful gases from the syngas generated after gasification in the coal gasification unit 20, and the syngas that has undergone the gas cleaning process is included in the power generation unit 50. It may be supplied to the first power generation unit 51 and used for power generation or may be supplied to the FT reaction unit 40 and used for the FT reaction.

The FT reaction unit 40 is a part that receives synthetic gas supplied after a gas cleaning process and hydrogen generated through electrolysis of water and produces diesel or gasoline, which are industrial fuels, through the FT reaction. Here, the FT reaction is a process developed by Fischer and Tropsh, a process that is the basis of petrochemicals, and is a reaction that targets the generation of alkanes (CnH(2n+2)) from CO and H _2, which are syngases. In addition, the FT reaction unit 40 generates unused off-gas that does not participate in the FT reaction.

The power generation unit 50 may be composed of a first power generation unit 51 and a second power generation unit 52. The first power generation unit 51 receives the syngas cleaned by the syngas cleaning unit 30 through the coal gasification unit 20 and drives the engine to generate electricity. The second power generation unit 52 receives unused off-gas that has not participated in the FT reaction from the FT reaction unit 40 and drives the engine to generate electricity.

Here, the power generation unit 50 can generate power by selectively operating one of the first power generation unit 51 and the second power generation unit 52 according to the composition of the synthesis gas generated by the coal gasification unit 20. have.

In other words, oxygen is required in the gasification process of coal, and this oxygen can be obtained through electrolysis of water using solar power generation during the day, and hydrogen is also produced through electrolysis. The oxygen generated by using is supplied to the coal gasification unit 20 and hydrogen is supplied to the FT reaction unit 40 to generate synthesis gas and perform FT reaction, and at this time, the composition of the synthesis gas produced in the coal gasification unit 20 H ₂ has a range of 70%, CO 15%, CO ₂ 15%. The synthesized gas thus produced corresponds to the medium caloric gas (about 3,000 kcal/m ³ of heat generated) described above and is used in the FT reaction, and the second power generation unit 52 is driven by using unused off-gas that did not participate in the FT reaction. To generate electricity.

And since water electrolysis is not performed at night because solar power is not generated, the gasification process is performed by supplying air instead of oxygen to the coal gasification unit 20, and the components of the generated syngas are H ₂ 15%, CO It has a range of 15%, CO ₂ 10%, N ₂ 60%. The synthesis gas thus produced corresponds to the low-calorie gas (heating amount around 1,000 kcal/m ³ ) described above, so that the FT reaction does not occur properly. Therefore, the syngas is not supplied to the FT reaction unit 40 but is directly supplied to the first power generation unit 51, and electricity can be generated by driving the first power generation unit 51 using the syngas.

In this case, the first power generation unit 51 may be a Hon-so engine generator using a compression ignition (CI) method. That is, the first power generation unit 51 generates power by driving the engine using the syngas generated through the gasification process using air at night, and the syngas generated by the coal gasification unit 20 using air at night is Due to the severe change in components, power generation can be more stably generated through a generator using a mixed-burn engine that mixes and burns synthetic gas with diesel or other gas fuel.

In addition, the second power generation unit 52 may be a power plant engine generator using a spark ignition (SI) method. That is, the second power generation unit 52 generates power by driving the engine by using only the off gas generated in the FT reaction unit 40 during the day, but the off gas generated in the FT reaction unit 40 during the day has about About 3,000 kcal/m ³ , for the combustion of off-gas having a medium heat generation, a burning engine that burns in a spark ignition method can be used. Hereinafter, the configuration of a specific embodiment of the second power generation unit 52 will be described in more detail.

2 is a schematic diagram showing a second power generation unit according to an embodiment of the present invention. Referring to FIG. 3, the second power generation unit 52 includes a burnout engine 200, a radiator 300, a generator for a burnout engine 620, a first three-way catalyst 410, a front oxygen sensor 430, and a rear oxygen. A sensor 440, a second three-way catalyst 420, a nitrogen oxide sensor 460, and a control unit 500 may be included.

The burning engine 200 may be a gas engine driven using off-gas, and exhaust gas after being burned in the burning engine 200 may be discharged through the exhaust pipe 210.

The radiator 300 may be connected to the combustion engine 200 to cool heat generated by combustion while cooling water is circulated. In this case, the radiator 300 may be cooled in an air-cooled manner by a cooling fan that is connected to the drive shaft of the burner engine 200 and driven.

The electric power generator 620 is connected to the electric power engine 200 and is driven to generate electricity.

The first three-way catalyst 410 is installed in the exhaust pipe 210 of the combustion engine 200 to remove harmful gases such as carbon monoxide and nitrogen oxide contained in the exhaust gas discharged after being burned in the combustion chamber of the combustion engine 200. It reduces the concentration of harmful gas in exhaust gas.

The front oxygen sensor 430 is installed in the exhaust pipe 210 in front of the first three-way catalyst 410 in the flow direction of the exhaust gas, and is discharged after being burned in the combustion engine 200 before passing through the first three-way catalyst 410 The oxygen concentration in the exhaust gas can be measured.

The rear oxygen sensor 440 is installed in the exhaust pipe behind the first three-way catalyst 410 in the flow direction of the exhaust gas, and the oxygen concentration in the exhaust gas in a state in which harmful gases are removed after passing through the first three-way catalyst 410 Can be measured.

The second three-way catalyst 420 is installed in the exhaust pipe 210 behind the rear oxygen sensor 440 in the flow direction of the exhaust gas to remove harmful gases in the exhaust gas once more, and the concentration of carbon monoxide, which is the harmful gas in the exhaust gas. Can be significantly lowered, and the concentration of nitrogen oxides can be reduced to almost zero.

The nitrogen oxide sensor 460 may be installed in the exhaust pipe 210 behind the rear oxygen sensor 440 in the flow direction of the exhaust gas, and exhaust after removing harmful gas components in the exhaust gas using the nitrogen oxide sensor 460 By measuring the concentration of nitrogen oxides in the gas, it can be confirmed whether the concentration of nitrogen oxides is maintained below 50 ppm, which is the standard value required for the growth of crops. In addition, the control unit 500 may control the combustion engine 200 according to a value measured by the nitrogen oxide sensor 460.

The control unit 500 is connected to the burnout engine 200 to control the burnout engine 200. A detailed description of the control of the burner engine 200 of the control unit 500 is as follows. The control unit 500 is connected to the front oxygen sensor 430, the rear oxygen sensor 440, and the nitrogen oxide sensor 460, and the oxygen concentration measured by the oxygen sensors 430 and 440 and the nitrogen measured by the nitrogen oxide sensor 460 The burning engine 200 may be controlled according to the concentration of the oxide. At this time, the control unit 500 has previously set and input the map data on the amount of basic fuel that can be controlled so that the combustion engine 200 is operated at the theoretical air fuel ratio. In addition, the control unit 500 adds the amount of fuel corrected by the value measured by the front oxygen sensor 430 and the amount of fuel corrected by the value measured by the rear oxygen sensor 440 to mix air and fuel in the burnout engine 200. It is possible to control the fuel amount of gas fuel (off gas) supplied to the mixer to be corrected. Thus, when the front oxygen sensor 430, the rear oxygen sensor 440 and the first three-way catalyst 410 are used to control the burnout engine 200, the concentration of carbon monoxide and nitrogen oxide in the exhaust gas will be maintained at a very low level. I can.

3 is a graph showing the thermal efficiency according to the compression ratio and the excess air ratio (λ) of the burning engine in the second power generation unit of the power generation system using the coal gasification syngas and FT reaction off-gas according to an embodiment of the present invention. . The burning engine of the second power generation unit 52 was subjected to an experiment in which the compression ratio was increased from 10:1 to 17:1 in a spark ignition method as described above, similar to that in the first power generation unit 51. At this time, as shown in FIG. 2, as the compression ratio increases, the thermal efficiency tends to improve, but when the compression ratio becomes 17:1 at the theoretical air fuel ratio (λ=1.00), the thermal efficiency sharply decreases as spontaneous ignition occurs. Was confirmed. On the other hand, as well shown in FIG. 2, it can be seen that in the theoretical air fuel ratio, when the compression ratio is within the range of 13:1 to 15:1, high thermal efficiency is almost similarly exhibited.

Accordingly, it is preferable that the combustion engine of the spark ignition method of the second power generation unit 52 is operated at a theoretical air fuel ratio (λ=1.00) while the compression ratio is within the range of 13:1 to 15:1. When operated under such conditions, it is confirmed by the graph of FIG. 3 that a very high thermal efficiency of about 37% can be obtained, that is, electricity can be generated by operating the engine with low pollution and high efficiency.

FIG. 4 is a graph showing the concentration of harmful gases in exhaust gas in a state in which the burnout engine is controlled by a theoretical air fuel ratio using a front oxygen sensor, a rear oxygen sensor, and a first three-way catalyst in a second power generation unit according to an embodiment of the present invention. to be. Referring to FIG. 4, when the front oxygen sensor 430, the rear oxygen sensor 440, and the first three-way catalyst 410 are used together to operate the combustion engine 200 at theoretical air fuel efficiency, carbon monoxide in exhaust gas Even if the concentration of is maintained below 50ppm, which is the standard value required for the growth of crops, the concentration of nitrogen oxides sometimes exceeds the standard value over time.

Figure 5 is a second power generation unit according to an embodiment of the present invention using a front oxygen sensor, a rear oxygen sensor, and a first three-way catalyst, but the average of the air excess ratio (λ) is about 1.02 slightly higher than 1.00 It is a graph showing the concentration of harmful gas in exhaust gas under the control to operate in the lean state Referring to FIG. 5, the combustion engine 200 of the present invention may be operated in a lean state of about 1.02, where the average of the excess air ratio λ is slightly higher than 1.00. At this time, the average of the excess air ratio λ may be in a range greater than 1.018 and less than 1.022, and preferably, it may be operated so that the average of the excess air ratio is 1.02. That is, when the combustion engine 200 is operated in a lean state of about 1.02, which is slightly higher than 1.00 through the control unit 500, the combustion engine 200 flows into the combustion chamber of the engine relatively compared to when it is controlled to burn at the theoretical air fuel ratio. The amount of gaseous fuel in the mixer becomes smaller, and the amount of oxygen in the mixer becomes larger. Accordingly, the concentration of carbon monoxide and hydrocarbon in the exhaust gas slightly decreases and the concentration of nitrogen oxides slightly increases compared to operating at the theoretical air fuel ratio. It is maintained at a lower state, so that the concentration of carbon monoxide and nitrogen oxide in the exhaust gas can be kept lower than 50 ppm, which is a reference value required for the growth of crops.

On the other hand, theoretically, the above-described control method, that is, by changing the theoretical air fuel ratio to a lean state using the values measured by the oxygen sensors 430, 440, and consequently lowering the nitrogen oxide concentration as shown in FIG. 5 You can achieve the same result. However, it has been empirically known that the frequency of occurrence of the results as shown in FIG. 4 is at a level that cannot be ignored even if the engine is operated under control under such conditions due to the occurrence of abnormal combustion in the actual engine operation process. In order to solve this problem, control may be performed using a nitrogen oxide sensor 460 provided in the system of the present invention. That is, by using the values measured by the nitrogen oxide sensor 460 to further control the air-fuel ratio of the combustion engine 200, the maximum value of the nitrogen oxide may be further reduced. That is, by further using the nitrogen oxide sensor 460 to control the air-fuel ratio, the concentration of the harmful gas can be more stably controlled, and FIG. 6 is a result of the control using the same control method. Referring to FIG. 6, it can be seen that by further using a nitrogen oxide sensor to control the air-fuel ratio, a very good result is obtained in which NOx is always 10 ppm or less and CO is more stable and low. Thus, the exhaust gas discharged through the exhaust pipe 210 after being burned by the power plant engine 200 of the second power generation unit 52 can be directly supplied to the facility gardening house to be utilized for carbon dioxide fertilization of crops.

The present invention is not limited to the above-described embodiments, and the scope of application thereof is diverse, as well as anyone with ordinary knowledge in the field to which the present invention belongs without departing from the gist of the present invention claimed in the claims. Of course, various modifications are possible.

10: coal pretreatment unit 15: solar power generation unit
16: electrolysis device 20: coal gasification unit
30: syngas cleaning unit 40: FT reaction unit
50: power generation department
51: first power generation unit 52: second power generation unit
200: burning engine 210: exhaust pipe
300: radiator
410: first three-way catalyst 420: second three-way catalyst
430: front oxygen sensor 440: rear oxygen sensor
460: nitrogen oxide sensor
500: control unit 620: generator for power plant engine

Claims (12)

A coal gasifier for generating syngas using coal;
An FT reaction unit receiving syngas from the coal gasification unit and producing industrial fuel through an FT reaction; And
A first power generation unit that receives syngas from the coal gasification unit and drives an engine to generate electricity, and an unused off-gas that has not participated in the FT reaction from the FT reaction unit to drive the burning engine using a spark ignition method. A power generation unit including a second power generation unit to generate electricity;
A power generation system using coal gasification syngas and FT reaction off-gas, including.
The method of claim 1,
The power generation unit generates coal gasification synthesis gas and FT reaction off-gas, characterized in that the power generation is performed by selectively operating one of the first power generation unit and the second power generation unit according to a component of the synthesis gas generated by the coal gasification unit. Power generation system utilized.
The method of claim 1,
A solar power generation unit that generates power using solar power; And
An electrolysis device that receives electricity from the photovoltaic power generation unit and supplies oxygen obtained by electrolyzing water to the coal gasification unit and supplies hydrogen to the FT reaction unit; To
Power generation system using coal gasification syngas and FT reaction off-gas made further including.
The method of claim 3,
Coal, characterized in that during the day, oxygen and hydrogen generated using the photovoltaic power generation unit and the electrolysis device are supplied to generate synthesis gas and FT reaction, and electricity is generated in a second power generation unit using off-gas. Power generation system using gasified syngas and FT reaction off-gas.
The method of claim 3,
A power generation system using coal gasification synthesis gas and FT reaction off-gas, characterized in that at night, air is supplied to the coal gasification unit to generate syngas, and electricity is generated in the first power generation unit using the generated syngas. .
The method of claim 1,
The power generation system using coal gasification syngas and FT reaction off-gas, characterized in that the compression ratio is formed to a value within the range of 13:1 to 15:1.
The method of claim 6,
The power generation system using coal gasification synthesis gas and FT reaction off-gas, characterized in that the burning engine is operated at a theoretical air fuel ratio.
The method of claim 6,
The second power generation unit,
A first three-way catalyst installed in the exhaust pipe of the combustion engine to remove harmful gases contained in exhaust gas; A front oxygen sensor installed in an exhaust pipe in front of the first three-way catalyst and a rear oxygen sensor installed in an exhaust pipe behind the first three-way catalyst in the flow direction of the exhaust gas; And a control unit connected to the burner engine, the front oxygen sensor and the rear oxygen sensor to control the burnout engine. It is made including,
The power generation system using coal gasification syngas and FT reaction off-gas, characterized in that the combustion engine is operated in a lean state with an average of excess air ratio (λ) of higher than 1.00.
The method of claim 8,
The power generation system using coal gasification syngas and FT reaction off-gas, characterized in that the combustion engine is operated within a range in which the average of the excess air ratio (λ) is greater than 1.018 and less than 1.022.
The method of claim 8,
The second power generation unit,
Power generation system using coal gasification synthesis gas and FT reaction off-gas, further comprising a second three-way catalyst installed in the exhaust pipe behind the rear oxygen sensor in the flow direction of the exhaust gas to remove harmful gases contained in the exhaust gas .
The method of claim 8,
The second power generation unit,
A power generation system using coal gasification synthesis gas and FT reaction off gas further comprising a nitrogen oxide sensor installed in an exhaust pipe behind the rear oxygen sensor in the flow direction of the exhaust gas.
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