KR101769438B1 - Tri-gen system for horticulture utilizing ultra low emission gas engine skill with low pressure fuel condition - Google Patents

Abstract

The present invention relates to a tri-gen system for horticulture using a gas engine to be utilized for cooling, heating, and carbon dioxide application, or to be utilized for electricity, heating, and carbon dioxide application. The tri-gen system comprises: a first three-way catalyst installed on an exhaust pipe of the gas engine, and removing harmful gases included in the exhaust gas; a front oxygen sensor installed in the front of the first three-way catalyst and a rear oxygen sensor installed at the rear thereof in a flowing direction of the exhaust gas; and a control unit connected to the gas engine and the oxygen sensors to control the gas engine. An ultralow pressure gas fuel having 0.03 kPa or less is supplied to the gas engine. The control unit controls the average of a lambda () of the gas engine in a rich state to be lower than a theoretical air-fuel ratio. A concentration of nitrogen oxide (NOx) in an exhaust gas is controlled to be equal to or less than a standard value needed to grow a crop and to be lower than a concentration of carbon monoxide (CO) in an exhaust gas. The tri-gen system for horticulture using an ultralow pressure low pollution gas engine technique can be stably and easily utilized for carbon dioxide application of a horticulture house or the like.

Description

[0001] The present invention relates to a tri-gen system for horticulture using ultra-low-pressure low-pollution gas engine technology,

The present invention relates to a trailer system for facility horticulture using an ultra low pressure, low-pollution gas engine technology, which is used for cooling, heating and carbon dioxide fertilization using a gas engine or a traizen system for utilization of electricity, heating and carbon dioxide It is possible to precisely control the concentration of the noxious gas in the exhaust gas discharged after being burned in the state where the ultra low pressure gaseous fuel is supplied to the gas engine so that the harmful gas in the exhaust gas supplied for the carbon dioxide application to the facility horticultural house Low-pressure, low-pollution gas engine technology capable of making the concentration of the gas equal to or lower than a reference value required for growing the crop.

In general, a generator using a gas engine or a trailer system using a gas engine heat pump (GHP) can be used for heating (hot water supply), cooling and carbon dioxide application using cheap gas fuel (natural gas, city gas, etc.) And is configured to generate electric power by using a generator driven by a gas engine.

1, the generator 102 is driven by a combustor 101 such as a gas engine or a gas turbine to generate electric power to the lighting apparatus 230 in the greenhouse 200, And a heat exchanger 110 for exchanging hot water heat exchanged in the heat exchanger 110 with the exhaust heat generated by the operation of the combustor 101 and the cooling water heated by the combustor, And a carbon dioxide supplying means for making use of carbon dioxide in the exhaust gas generated by the operation of the combustor 101 for carbon dioxide fertilization of the greenhouse. At this time, the carbon dioxide is transferred through the integrated piping system 130 in the state of being dissolved in the hot water for heating, so that only the purified carbon dioxide is used for the carbon dioxide fertilization of the greenhouse.

However, because it is this generator or whether Chippewa systems such is the like of hydrocarbon (HC), carbon monoxide (CO) and nitrogen oxides (NO _X) noxious exhaust gases in the exhaust gas discharged after combustion from the gas engine 101 is a large amount, gas It is difficult to directly use the exhaust gas discharged through the exhaust pipe of the engine for carbon dioxide fertilization required for cultivation of crops such as a greenhouse or a large-scale facility gardening complex.

Accordingly, the exhaust gas discharged from the exhaust pipe of the gas engine can be directly supplied to a green house or a large-scale facility gardening complex and controlled so that the exhaust gas can be controlled to a level lower than the concentration of the harmful gas necessary for growing the crop, A TRIZEN system and a control method thereof are needed.

KR 10-1398395 B1 (2014.05.16)

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a trailer system which utilizes a gas engine for cooling, heating and carbon dioxide fertilization or utilizes a gas engine for electricity, heating and carbon dioxide In the state where the ultra low pressure gas fuel is supplied to the gas engine, it is possible to precisely control the concentration of the noxious gas in the exhaust gas which is discharged after being burned. However, the harmful gas in the exhaust gas supplied for the carbon dioxide application to the facility horticultural house Gas low-pollution gas engine technology capable of keeping the concentration of nitrogen oxides (NOx), which is one of noxious gases contained in the exhaust gas, close to zero or close to zero, The present invention provides a trailer system for facility horticulture.

In order to accomplish the above object, the present invention provides a tracing system for a horticulture using an ultra-low pressure low-pollution gas engine technology, which utilizes a gas engine for cooling, heating, and carbon dioxide fertilization or uses a gas engine for electricity, heating, A first three-way catalyst installed in an exhaust pipe of the gas engine to remove noxious gases contained in the exhaust gas; A front oxygen sensor disposed in front of the first three-way catalyst in a flow direction of the exhaust gas; And a control unit connected to the gas engine and the oxygen sensors to control the gas engine; Wherein the gas engine is supplied with an ultra low pressure gaseous fuel of 0.03 kPa or less and the control unit controls the average of the lambda of the gas engine to a rich state so as to be lower than the stoichiometric air fuel ratio, And the concentration of nitrogen oxides (NOx) is controlled to be lower than the reference value required for growing the crop and lower than the concentration of carbon monoxide (CO) in the exhaust gas.

Further, the concentration of carbon monoxide in the exhaust gas is controlled so as to be equal to or lower than a specific set value while being equal to or less than a reference value required for growth of the crop.

Also, the reference value of the noxious gas concentration in the exhaust gas required for growing the crop is 50 ppm, the concentration of the carbon monoxide is controlled to 0.2 ppm to 16.3 ppm, and the concentration of the nitrogen oxide is controlled to 0 ppm to 0.2 ppm .

The concentration of the carbon monoxide is controlled according to the number of revolutions and the load of the gas engine. If the revolution speed and the load of the gas engine are low, the concentration of the carbon monoxide is controlled to be low. Is controlled to be high.

The second three-way catalyst is installed in the exhaust pipe of the gas engine to remove noxious gases contained in the exhaust gas. The second three-way catalyst is disposed behind the rear oxygen sensor in the flow direction of the exhaust gas Is installed.

In addition, it is preferable that the amount of fuel corrected by the value measured by the front oxygen sensor and the amount of fuel corrected by the value measured by the rear oxygen sensor are added to the basic fuel amount set in advance in the control unit, And is corrected to be corrected.

The gas engine is provided with a mixer for mixing the gaseous fuel and the air supplied thereto. The mixer is provided with an air-fuel ratio control valve capable of controlling the supply amount of the gaseous fuel, and the gas- Is adjusted to be linearly changed.

Also, the air-fuel ratio control valve may be configured such that the opening of the passage through which the gaseous fuel is supplied is formed in a rectangular cross-section, and the air-fuel ratio control valve includes a servo motor or a throttle plate connected to the step motor, So that the open area of the opening is adjusted to change linearly.

The mixer may include a body formed with an air passage through which the air flows and a fuel passage through which the gaseous fuel flows, and a mixer flow path through which the air and the gaseous fuel are mixed to flow the mixture; And a core which is tightly coupled to an inner circumferential surface of an air flow path formed in the body, the core being disposed at a portion where the air flow path and the fuel flow path meet; Wherein the core is formed in a ring shape and has a concave groove formed along a circumferential direction on an outer circumferential surface thereof so that the groove is connected to the fuel flow path and a plurality of through holes are formed in the groove toward the inside, And the plurality of through holes are spaced apart from each other.

The tricegen system for facility horticulture using the ultra low pressure low-emission low-emission gas engine technology of the present invention is a system in which the concentration of the noxious gas contained in the exhaust gas is maintained below the concentration required for the growth of the crop, The concentration can be maintained close to zero or zero, which is advantageous in that it can be stably and easily utilized in the carbon dioxide application of the facility horticultural complex.

FIG. 1 is a block diagram showing a conventional TGG system capable of applying carbon dioxide to a greenhouse using a generator or a GHP. FIG.
FIG. 2 and FIG. 3 are a structural view and a conceptual view illustrating a trailer system for facility horticulture using an ultra low pressure, low pollution gas engine technology according to an embodiment of the present invention.
4 is a graph showing the concentration of noxious gas in the exhaust gas under the control of the stoichiometric air-fuel ratio using only the front oxygen sensor.
5 is a graph showing the concentration of noxious gas in the exhaust gas under the control of the stoichiometric air-fuel ratio using the front oxygen sensor and the rear oxygen sensor.
6 is a graph showing the relation between the concentration of noxious gas in the exhaust gas and the concentration of noxious gas in the state where the average of lambda is controlled to be lower (stricter) than the stoichiometric air-fuel ratio using a front oxygen sensor and a rear oxygen sensor provided in front of and behind the first three- The graph shown.
FIGS. 7 and 8 are graphs showing concentrations of nitrogen oxides when the concentration of carbon monoxide in the exhaust gas is not controlled to be higher than a specific set value according to the present invention.
FIG. 9 and FIG. 10 are graphs showing the concentrations of nitrogen oxides according to the number of revolutions of the gas engine when the concentration of carbon monoxide in the exhaust gas is controlled to be higher than a specific set value in the state where the second three-way catalyst according to the present invention is further installed.
11 is a graph showing a control method for the fuel amount correction according to the present invention.
13 is a block diagram showing a configuration of a mixer, an air-fuel ratio control valve, and a gas fuel supply line provided in a gas engine according to the present invention.
FIGS. 14 to 16 are a perspective view showing a mixer and an air-fuel ratio control valve according to the present invention, a right side view and a sectional view as viewed in a direction A, respectively.
17 is a graph showing that the opening area of the air-fuel ratio control valve introduced into the mixer according to the present invention is linearly adjusted.
Figs. 18 and 19 are a cross-sectional view and a cross-sectional view in the BB direction of the core according to the present invention;

Hereinafter, the tragene system for facility horticulture using the ultra low pressure and low-pollution gas engine technology of the present invention will be described in detail with reference to the accompanying drawings.

≪ Example 1 >

2 and 3 are a structural view and a conceptual view showing a trazhen system for facility horticulture using an ultra low pressure and low pollution gas engine technology according to an embodiment of the present invention, FIG. 3 is a graph showing the concentration of noxious gas in the exhaust gas in a state in which the average of lambda is controlled to be lower (stricterly) than the stoichiometric air-fuel ratio using a front oxygen sensor and a rear oxygen sensor provided at the rear.

As shown in the drawing, the trazhen system for facility horticulture using the ultra low pressure and low pollution gas engine technology according to an embodiment of the present invention can be utilized for cooling, heating and carbon dioxide fertilization using the gas engine 100, A first three-way catalyst (410) installed in the exhaust pipe (110) of the gas engine (100) to remove noxious gases contained in the exhaust gas; A front oxygen sensor 430 installed in front of the first three-way catalyst 410 in the flow direction of the exhaust gas, and a rear oxygen sensor 440 installed in the rear direction; And a control unit 500 connected to the gas engine 100 and the oxygen sensors 430 and 440 to control the gas engine 100. The gas engine 100 is supplied with an ultra low pressure gaseous fuel of 0.03 kPa or less and the control unit 500 controls the gas engine 100 such that the average of the lambda of the gas engine 100 is lower than the stoichiometric air fuel ratio (NOx) in the exhaust gas is controlled to be lower than the reference value required for growth of the crop and lower than the concentration of carbon monoxide (CO) in the exhaust gas.

First, the trailer system for facility horticulture using the ultra-low pressure low-pollution gas engine technology according to an embodiment of the present invention drives the gas engine 100 to generate heating, cooling, and carbon dioxide fertilization And the like. Alternatively, the gas engine 100 may be driven to utilize the driving force and heat of the gas engine for electricity, heating, and carbon dioxide application. At this time, the heating can be utilized as the heating and hot water of the facility horticultural house 700 by connecting the hot water tank to the radiator 200 through which the cooling water for cooling the gas engine 100 is circulated. The refrigerant is compressed by using the compressor 300 connected to the gas engine 100 and used for cooling the facility horticultural house 700 using the compressed refrigerant. Alternatively, a heat pump using compressed refrigerant may be used to switch between heating and cooling. In addition, electricity can be utilized for illumination of the facility horticultural house 700 through the generator 600 connected to the gas engine 100 and driven. In addition, the carbon dioxide is removed from the exhaust gas discharged through the exhaust pipe 110 after being burned in the gas engine 100 to reduce the concentration of the noxious gas, and then supplied to the facility horticultural house 700, The contained carbon dioxide can be utilized.

The gas engine 100 may be an engine driven using relatively low cost gaseous fuels such as LPG, natural gas, city gas, biogas, and renewable fuels. The radiator 200 is connected to the gas engine 100 to cool the heat generated by the combustion of the gaseous fuel while the cooling water is circulated. At this time, the radiator 200 may be cooled by a cooling fan connected to the driving shaft of the gas engine 100, and the heated cooling water may be sent to a separate hot water tank connected to the radiator 200, And cooling water is supplied to the radiator 200 to supplement the cooling water. The compressor 300 is connected to the driving shaft of the gas engine 100 and the compressor 300 is driven by the gas engine 100 to compress the refrigerant.

The first three-way catalyst 410 is installed in the exhaust pipe 110 of the gas engine 100 to remove noxious gases contained in the exhaust gas that is burned and discharged in the combustion chamber of the gas engine 100, And the exhaust gas discharged through the exhaust pipe 110 can be directly supplied to the facility horticultural house 700 for utilization in carbon dioxide fertilization and the carbon dioxide and nitrogen contained in the exhaust gas can be utilized.

The front oxygen sensor 430 and the rear oxygen sensor 440 may be installed in front of and behind the first three-way catalyst 410. That is, the front oxygen sensor 430 is provided in front of the first three-way catalyst 410 in the flow direction of the exhaust gas, and the exhaust gas after being combusted in the gas engine 100 before passing through the first three- The oxygen concentration in the gas can be measured. A rear oxygen sensor 440 is provided behind the first three-way catalyst 410 in the flow direction of the exhaust gas so that the oxygen concentration in the exhaust gas in the state where the noxious gases are removed after passing through the first three- Can be measured.

The control unit 500 is connected to the gas engine 100 to control the gas engine 100 and is connected to the oxygen sensors 430 and 440 to control the gas engine 100 according to the oxygen concentration measured by the oxygen sensors 430 and 440 Can be controlled.

At this time, the gas engine 100 is supplied with ultra-low pressure gaseous fuel of 0.03 kPa or less. In the control unit 500, the average of the lambda of the gas engine 100 is controlled to be richer than the stoichiometric air- , And to control so that the concentration of nitrogen oxides (NOx) in the exhaust gas is kept below the reference value required for growing the crop and lower than the concentration of carbon monoxide (CO) in the exhaust gas. Here, the supply pressure of the gaseous fuel generally used is 2.5 kPa to 2.8 kPa and is usually supplied at 2.7 kPa. In the present invention, in order to reduce the noxious gas in the exhaust gas, Can be supplied. At this time, the gaseous fuel having a pressure of -0.2 kPa to 0.03 kPa is supplied to the mixer 180, and the air and the gaseous fuel are mixed in the mixer 180, and the mixer can be introduced into the combustion chamber of the gas engine 100. The control unit 500 controls the average value of the lambda of the gas engine 100 to be rich so as to be lower than the stoichiometric air-fuel ratio so that the concentration of nitrogen oxide (NOx) in the exhaust gas is equal to or lower than a reference value required for growing the crop So that the concentration of carbon monoxide (CO) in the exhaust gas is maintained to be lower than the concentration of carbon monoxide (CO) in the exhaust gas. That is, for example, the carbon monoxide concentration is higher than when the average of lambda (?) Is controlled to a rich state slightly lower than the stoichiometric air-fuel ratio and the lambda (?) Is controlled by the stoichiometric air-fuel ratio. However, And the concentration of nitrogen oxides can be lowered to a lower level while keeping the concentration of nitrogen oxides below the standard value required for growing the crops. That is, when the average of the lambda is controlled to be a rich state lower than the stoichiometric air-fuel ratio, the amount of gas fuel in the mixer becomes relatively larger than that in the case where it is controlled to be combusted at the stoichiometric air-fuel ratio, The concentration of carbon monoxide (CO) and the concentration of hydrocarbons (HC) in the gas are slightly increased, but the concentration of nitrogen oxides (NOx) can be maintained at a very low level. At this time, the concentrations of nitrogen oxides, carbon dioxide and hydrocarbons in the exhaust gas can be maintained below the reference value required for growing the crops, the concentration of nitrogen oxides is kept lower than the concentration of carbon monoxide, the concentration of carbon monoxide and the concentration of hydrocarbons They appear similar to each other and can be maintained at a constant concentration.

Thus, for example, even when the concentration of carbon monoxide in the exhaust gas is maintained at 50 ppm or less, which is a reference value required for growing the crop, as shown in FIG. 4, when the control is performed using only the front oxygen sensor 430, the concentration of nitrogen oxide exceeds the reference value . When the front oxygen sensor 430 and the rear oxygen sensor 440 are used together as shown in FIG. 5, even when the concentration of carbon monoxide in the exhaust gas is kept at 50 ppm or less, which is the reference value, the concentration of nitrogen oxides may exceed the reference value do. As shown in FIG. 6, in the present invention, since the average of lambda (λ) is richly controlled by using the front oxygen sensor 430, the rear oxygen sensor 440 and the first three-way catalyst 410, the concentration of carbon monoxide The concentration of the oxides can be maintained at a level lower than the reference value and the concentration of the nitrogen oxides can be stably maintained at a lower concentration while the concentration of the nitrogen oxides is lower than the concentration of the carbon monoxide.

As described above, the tragene system for facility horticulture using the ultra low pressure, low-pollution gas engine technology of the present invention and the control method thereof are capable of controlling the concentration of the harmful gas contained in the exhaust gas to be lower than the concentration required for growing the crop, It is possible to remarkably lower the concentration of nitrogen oxides (NOx), which is stable and easy to utilize in the carbon dioxide fertilizing of the facility gardening complex.

Further, the carbon monoxide concentration in the exhaust gas may be controlled so as to be equal to or lower than a reference value required for growth of the crop and kept at a specific set value or more.

That is, even if the concentration of carbon monoxide in the exhaust gas is equal to or lower than the reference value required for growth of the crop and is kept higher than the nitrogen oxide concentration in the exhaust gas as shown in Figs. 7 and 8, , The concentration of nitrogen oxides is higher than the concentration of carbon monoxide, and eventually exceeds the reference value required for the growth of the crop set as the target . Therefore, as shown in FIGS. 9 and 10, when the concentration of carbon monoxide is maintained below a predetermined value required for growth of the crop and a predetermined set value or more, it is possible to maintain the concentration of nitrogen oxide at a constant concentration lower than the concentration of carbon monoxide.

Also, the reference value of the noxious gas concentration in the exhaust gas required for growing the crop is 50 ppm, the concentration of the carbon monoxide is controlled to 0.2 ppm to 16.3 ppm, and the concentration of the nitrogen oxide can be controlled to 0 ppm to 0.2 ppm.

That is, the reference value of the noxious gas concentration in the exhaust gas required for growing the crops may be 50 ppm. At this time, if the concentration of carbon monoxide is controlled to be lower than the noxious gas reference value and controlled to a specific set value range of 0.2 ppm to 16.3 ppm, the concentration of nitrogen oxides can be controlled to 0 ppm to 0.2 ppm so that the nitrogen oxide concentration in the exhaust gas is very low Can be stably maintained.

The concentration of the carbon monoxide is controlled according to the number of revolutions and the load of the gas engine 100. When the number of revolutions and the load of the gas engine 100 are low, the concentration of carbon monoxide is controlled to be low, If the number of revolutions and the load is high, the concentration of carbon monoxide can be controlled to be high.

This is because the concentration of the noxious gas in the exhaust gas may increase depending on the number of revolutions and the load of the gas engine, so that the concentration of the carbon monoxide is controlled to be kept relatively high under the conditions of the revolution speed of the gas engine and the load, The concentration of carbon monoxide in the exhaust gas is kept low even if the number of revolutions and the load of the gas engine are kept low while the concentration of nitrogen oxides is maintained at a very low level .

The second three-way catalyst 420 is disposed in the exhaust pipe 110 of the gas engine 100 and removes noxious gases contained in the exhaust gas. And may be installed behind the rear oxygen sensor 440 in the flow direction of the gas.

That is, as shown in the graph, if only the first three-way catalyst 410 is used and the average of the lambda is controlled to be a rich state lower than the stoichiometric air-fuel ratio through the front oxygen sensor 430 and the rear oxygen sensor 440 The concentration of carbon monoxide and the concentration of nitrogen oxides can be maintained at 40 ppm and 10 ppm, respectively, which are lower than the reference values required for the growth of the crops. However, the second three-way catalyst 420 installed at the rear of the rear oxygen sensor 440, When the harmful gases in the exhaust gas are removed, the concentration of carbon monoxide can be maintained at 7 ppm and the concentration of nitrogen oxide can be kept close to almost zero. Thus, the exhaust gas discharged after combustion in the gas engine can be directly supplied to the facility horticulture house 700 and utilized stably for carbon dioxide fertilization.

The following is a control table for each condition of the gas engine when the first three way catalyst 410 and the second three way catalyst 420 according to the present invention are installed.

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 are added to the basic fuel amount set in advance in the control unit 500 , The amount of fuel supplied to the gas engine 100 can be controlled to be corrected.

That is, the control unit 500 is preliminarily set with map data for the basic fuel amount capable of controlling the lambda of the gas engine 100 to be the stoichiometric air-fuel ratio. The control unit 500 adds the fuel amount corrected by the value measured by the front oxygen sensor 430 and the fuel amount corrected by the value measured by the rear oxygen sensor 440 to the mixer 180 of the gas engine 100 So that the amount of fuel of the supplied gaseous fuel can be controlled to be corrected. At this time, as shown in FIG. 11, I gain control is performed through a value measured by the front oxygen sensor 430, delay control is performed in a rich state and a lean state, the fuel amount can be corrected by performing proportional gain control. Thus, by controlling the rich delay time and the lean delay time, the output of the rear oxygen sensor 440 can be controlled to be fed back near the desired threshold value. At this time, the threshold value, which is the reference point, So that the concentration of carbon monoxide can be slightly increased and the concentration of nitrogen oxide can be maintained at 0 (zero) or close to zero.

[Detailed Embodiment]

13 is a configuration diagram showing the configuration of a mixer, an air-fuel ratio control valve and a gas fuel supply line provided in a gas engine according to the present invention.

As shown in the figure, the gas engine 100 is provided with a mixer 180 for mixing the supplied gas fuel and air, and the mixer 180 is provided with an air-fuel ratio control valve 170, And the supply amount of the gaseous fuel can be adjusted to be linearly changed by the air-fuel ratio control valve 170.

That is, the gas engine 100 may include an air-fuel ratio control valve 170 installed in the mixer 180 and the mixer 180 so as to control the air-fuel ratio of the air-fuel mixture supplied into the combustion chamber. The air-fuel ratio control valve 170 may be connected to the controller 500 and controlled. Thus, the amount of gas fuel in the mixer supplied to the combustion chamber can be controlled by using the air-fuel ratio control valve 170 installed in the mixer 180, and the gas fuel amount can be adjusted to be linearly changed by the air-fuel ratio control valve 170 . Thus, it is possible to control the fuel amount of the gaseous fuel mixed with air in the mixer 180 to be linearly controlled, thereby more precisely controlling the air-fuel ratio, thereby reducing the concentration of the noxious gas in the exhaust gas.

The mixer 180 may be configured such that external air is filtered through the air cleaner and then introduced into the mixer 180 and is regulated to a pressure of about 2.7 kPa through the first pressure regulator 130 in the fuel supply source 120 such as LPG The supplied gaseous fuel can be supplied to the mixer 180 while being adjusted to a pressure of -0.2 kPa to 0.03 kPa through the zero governor assembly composed of the solenoid valves 150 and the zero governor 160 have. A fuel filter 140 may be installed to remove foreign matter contained in the supplied gaseous fuel, and the supply and shutoff of the fuel may be performed by the solenoid valves 150. When the pressure of the gaseous fuel is regulated A pressure gauge 161 may be installed so as to confirm the pressure of the gaseous fuel supplied to the rear engine side. In this case, the first pressure regulator 130, the fuel filter 140, the solenoid valves 150, the zero governor 160, and the pressure gauge 161 can be sequentially connected, and the air- Lt; RTI ID = 0.0 > 170 < / RTI >

The air-fuel ratio control valve 170 includes a control plate 172 connected to the servomotor or the step motor 171, and the air-fuel ratio control valve 170 has a rectangular cross- So that the throttle plate 172 is moved in a direction parallel to the end surface of the opening 173 so that the open area of the opening 173 is linearly changed.

That is, as shown in FIGS. 14 to 17, the air-fuel ratio control valve 170 controls the cross-sectional area of the opening 173 of the flow passage supplied to the mixer 180 linearly, So that the amount of fuel can be adjusted linearly. At this time, a cross section (a shape of the opening viewed in the horizontal direction) of the opening 173 through which the gaseous fuel passes is formed into a rectangular cross section, and the lower end of the throttle 172 connected to the step motor 171 for opening and closing the opening 173 And can be adjusted so that the open area of the opening 173 linearly changes by the regulating plate 172 whose displacement can be precisely controlled by the step motor 171. [

The mixer 180 is connected to the air flow passage 182 through which the air flows and the fuel flow passage 183 through which the gaseous fuel flows. The mixer 180 mixes the air and the gaseous fuel, A body 181 on which the body 185 is formed; A core 186 tightly coupled to the inner circumferential surface of the air passage 182 formed in the body 181 and disposed at a portion where the air passage 182 and the fuel passage 183 meet; Wherein the core 186 is formed in a ring shape and a groove 187 is formed in the circumferential direction along the circumferential direction so that the groove 187 is connected to the fuel flow path 183 and the groove 187 A plurality of through holes 188 are formed toward the inner side and a plurality of through holes 188 are arranged apart from each other along the circumferential direction.

That is, the mixer 180 has the air passage 182 formed therein to allow air to be introduced into one side of the body 181, and the fuel passage 183 connected to the air passage 182. The fuel flow path 183 may be formed in a direction perpendicular to the air flow path 182 and the mixer flow path 185. The fuel flow path 183 may be formed in a direction perpendicular to the air flow path 182 and the air flow path 182, As shown in FIG. The core 186 is tightly coupled to the inner circumferential surface of the air passage 182 and may be disposed at a portion where the air passage 182 and the fuel passage 183 meet and the core 186 is formed into a ring- So that the outer circumferential surface thereof can be brought into close contact with the inner circumferential surface of the body 181 forming the air flow path 182. 18 and 19, the core 186 has a groove 187 recessed radially inwardly on the outer circumferential surface and may be formed on the entire circumferential periphery, and the outer circumferential surface of the groove 187 and the core 186 And a plurality of through holes 188 may be formed to be spaced from each other along the circumferential direction. At this time, the core 186 is coupled to the body 181 so that the groove 187 is connected to the fuel passage 183, so that the gas fuel supplied through the fuel passage 183 passes through the groove 187 of the core 186 Flows into the air passage 182 through the through holes 188, and the air and the gaseous fuel are mixed and then introduced into the combustion chamber of the gas engine through the mixer passage 185.

Thus, the air introduced into the mixer 180 and the gaseous fuel can be uniformly mixed and then introduced into the combustion chamber of the gas engine, so that the concentration of the harmful gas in the exhaust gas discharged after the combustion can be further reduced.

In addition, the control unit 500 can reduce the noxious gas in the exhaust gas from fluctuations in load and air-fuel ratio. For example, ETC (Electric Throttle Chamber) control technology can be applied to reduce load and rotational speed fluctuations. At this time, the number of revolutions of the gas engine can be kept constant through the control of the ECT 190 installed between the mixer 180 and the intake duct 191 and connected to the control unit 500, Can be reduced.

The first three-way catalyst 410 and the second three-way catalyst 420 may be composed of palladium (Pd) and rhodium (Rh), for example. More specifically, the first three- One cell may be formed in a volume of 0.5 liters by palladium, and the other cell may be formed by mixing palladium and rhodium in a ratio of 9: 1 to form a volume of 0.5 liters. The second three-way catalyst 420 may be formed by connecting two cells in series. In both cells, palladium and rhodium may be mixed in a ratio of 9: 1 to form a volume of 0.7 liters each. Here, palladium is less expensive than platinum (Pt) and has excellent heat durability, and palladium can be reduced by oxidizing hydrocarbons and carbon monoxide. In addition, rhodium mainly reduces NO in nitrogen oxides to reduce nitrogen oxides, and some oxidation of carbon monoxide and hydrocarbons can occur. Also, the first three-way catalyst is referred to as MCC (Manifold Catalyst Converter), which is mainly used for reducing carbon monoxide and hydrocarbons at the time of cold start, and can also reduce some nitrogen oxides. In addition, the second three-way catalyst is called UCC (Underbody Catalyst Converter) and can act as a main catalyst to simultaneously reduce carbon monoxide, hydrocarbons and nitrous oxides.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. It goes without saying that various modifications can be made.

100: Gas engine
110: exhaust pipe 120: fuel supply source
130: first pressure regulator 140: fuel filter
150: Solenoid valve 160: Zero governor
161: pressure gauge 162: connection tube
170: air-fuel ratio control valve
171: step motor (or servo motor) 172: throttle
173: opening
180: Mixer
181: body 182:
183: fuel flow
185: mixer flow path 186: core
187: groove 188: through hole
190: ETC 191: Intake duct
200: Radiator
300: Compressor
410: first three-way catalyst 420: second three-way catalyst
430: front oxygen sensor 440: rear oxygen sensor
500:
600: generator
700: Facilities Garden House

Claims (9)

In a trazhen system that utilizes a gas engine for cooling, heating and carbon dioxide fertilizing, or for gas, electric, heating, and carbon dioxide fertilization,
A first three-way catalyst provided in an exhaust pipe of the gas engine to remove noxious gases contained in the exhaust gas;
A front oxygen sensor disposed in front of the first three-way catalyst in a flow direction of the exhaust gas; And
A control unit connected to the gas engine and the oxygen sensors to control the gas engine; And,
The gas engine is supplied with an ultra low pressure gaseous fuel of 0.03 kPa or less,
Wherein the controller controls the average of the lambda of the gas engine to be rich so as to be lower than the stoichiometric air-fuel ratio, wherein the concentration of nitrogen oxides (NOx) in the exhaust gas is lower than a reference value required for growing the crops, Wherein the control is performed so that the concentration of the hydrogen gas is kept lower than the concentration of the nitrogen gas.
The method according to claim 1,
Wherein the carbon monoxide concentration in the exhaust gas is controlled so as to be equal to or lower than a predetermined value required for growth of the crop and to be maintained at a specific set value or more.
The method according to claim 1,
Wherein the reference value of the noxious gas concentration in the exhaust gas necessary for growth of the crop is 50 ppm, the concentration of the carbon monoxide is controlled to 0.2 ppm to 16.3 ppm, and the concentration of the nitrogen oxide is controlled to be 0 ppm to 0.2 ppm. Traizen System for Facility Horticulture using Low - Emission Gas Engine Technology.
The method according to claim 1,
The concentration of the carbon monoxide is controlled according to the number of revolutions and the load of the gas engine. If the revolution speed and the load of the gas engine are low, the concentration of the carbon monoxide is controlled to be low. Wherein the system is controlled by an ultra low pressure, low emission gas engine.
The method according to claim 1,
And a second three-way catalyst provided in the exhaust pipe of the gas engine to remove noxious gases contained in the exhaust gas, wherein the second three-way catalyst is installed behind the rear oxygen sensor in the flow direction of the exhaust gas Which is characterized by an ultra low pressure, low pollution gas engine technology.
The method according to claim 1,
The amount of fuel corrected by the value measured by the front oxygen sensor and the amount of fuel corrected by the value measured by the rear oxygen sensor are added to the basic fuel amount set in advance in the control unit so that the amount of fuel supplied to the gas engine is corrected Wherein the system is controlled by an ultra low pressure, low emission gas engine.
The method according to claim 1,
Wherein the gas engine is provided with a mixer for mixing the gaseous fuel and air supplied thereto, and the mixer is provided with an air-fuel ratio control valve capable of controlling the supply amount of the gaseous fuel,
Fuel ratio control valve so that the supply amount of the gaseous fuel is linearly changed by the air-fuel ratio control valve.
8. The method of claim 7,
Wherein the air-fuel ratio control valve has an opening of a passage through which the gaseous fuel is supplied is formed into a rectangular cross-
Wherein the air-fuel ratio control valve includes a servo motor or a throttle plate connected to the step motor, wherein the throttle plate is moved in a direction parallel to an end surface of the opening so that the open area of the opening is linearly changed. Traigen System for Facility Horticulture using Gas Engine Technology.
8. The method of claim 7,
The mixer includes:
A body which is formed so that an air flow path through which air flows and a fuel flow path through which the gaseous fuel flows communicate with each other and a mixer flow path through which the air and the gaseous fuel are mixed and the mixer flows; And
A core which is tightly coupled to an inner circumferential surface of an air flow path formed in the body and is disposed at a portion where the air flow path and the fuel flow path meet; , ≪ / RTI >
The core is formed in a ring shape and has a concave groove formed along the circumferential direction on the outer circumferential surface, the groove is connected to the fuel flow channel, the groove has a plurality of through holes formed inwardly and a plurality of through holes Wherein the low-pressure, low-pollutant gas engine is disposed at a predetermined distance from the trailer system.

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