KR20190023618A - Cogeneration system using biogas and method thereof - Google Patents

Abstract

The present invention relates to a cogeneration system using biogas and a method thereof. This invention uses biogas as fuel of a cogeneration system in order to generate electricity, and supplies sufficient hot water by performing double heating to the hot water by using combustion heat and exhaust gas of an engine unit of the cogeneration system. Moreover, the hot water is used as a heating energy source, thereby improving energy efficiency, and preventing waste of resources and environmental pollution. In addition, when the hot water circulating a medium-temperature water supply line and a medium-temperature water return line is above a predetermined temperature, a valve unit is controlled by the control unit. Therefore, stability and reliability in the cogeneration system are maximized, and maintenance costs are reduced. Not only that, the optimum packaging facilitates miniaturization and guarantees ease of installation, thereby facilitating distribution of the cogeneration system.

Description

[0001] The present invention relates to a cogeneration system using biogas,

The present invention relates to a cogeneration system using biogas and a cogeneration method using biogas, and more particularly, to a cogeneration system using biogas as a fuel for a cogeneration system, When the hot water circulating in the intermediate-temperature water supply line and the intermediate-temperature water recovery line is higher than a predetermined temperature, the control unit And more particularly, to a cogeneration method and apparatus using biogas capable of increasing the ease of installation and the convenience of installation by minimizing the size of the valve by controlling the valve portion to maximize stability and reliability and optimizing packaging.

In general, manure wastes generated in pig farms, livestock farms, and poultry farms and food wastes generated in urban areas are not only expensive to treat, but also have a shortage of organic waste disposal facilities.

In particular, small-scale farms and small-scale restaurants are not able to install waste disposal equipment, so they are mixed with general household waste, and even if they are separated and disposed of, there is a problem that collectors must send them back to specialist processing companies for disposal.

With the entry into force of the Kyoto Protocol, countries around the world are making various efforts to reduce greenhouse gas emissions.

For example, wastes containing a large amount of organic matter such as food waste, livestock wastewater, and city wastewater are disposed of through incineration, marine dumping, or public treatment without being incinerated.

More specifically, for example, about 5,500 tonnes of waste water per day, about 7,000 tonnes of livestock manure, and about 9,500 tonnes of sewage / wastewater, that is, about 22,000 tonnes per day, Waste is being processed through marine dumping.

However, because the London Convention prohibits the use of marine dumping and it is predicted that landfills will also become more difficult due to environmental reasons, it is inevitable to handle a large amount of waste through public treatment in the future, and there are many devices and devices It is in the trend of being developed.

Furthermore, devices and devices that develop using biogas generated at this time are still being developed.

Generally, organic wastes such as manure waste and food wastes are treated by anaerobic digestion by fermentation.

Manure wastes and food wastes can produce high concentration of biogas by separating methane gas generated during digestion process from desulfurization refinery and oil water so that manure wastes and food wastes can be reprocessed if they are used well.

However, although apparatuses and devices that generate electricity by using such biogas are being continuously developed, such apparatuses and devices use the configuration of a conventional internal combustion engine as it is.

1, in the conventional cogeneration system using biogas, the biogas gas supply line 1, the biogas introduced into the combustion air inlet and the combustion air are filtered through an air filter, and then the gas mixture 5 And can be supplied to the engine unit 7, and this process is collectively controlled through the control unit 9. [

At this time, the air is introduced into the combustion air inlet or the exhaust gas discharged from the engine is pressurized by the supercharger 3 and supplied to the gas mixer 5. That is, a force by which the exhaust gas discharged through the exhaust gas discharge line 2 flows by the supercharger 3 can be used.

The mixed gas in the gas mixing section 5 is compressed so that it can enter the engine section 7 more before entering the engine section 7. When the mixed gas is compressed, the temperature of the mixed gas mechanically increases.

Since the high-density mixed gas can not be generated within a constant capacity when the temperature of the mixed gas is increased as described above, an intercooler unit 6 is provided between the gas mixing unit 5 and the engine unit 7, Thereby producing a dense mixed gas.

The power generation section 8 produces electricity by driving the engine section 7. [

As described above, the cogeneration system and method using the conventional biogas have the following problems. That is, the cooling performance of the intercooler is not maintained constant and the heat exchanging unit does not perform the heat exchange double, There is a problem in that the energy efficiency is reduced due to no improvement.

Also, in the conventional cogeneration system and method using biogas, when components of the cogeneration system are damaged or destroyed due to the heating of the medium temperature water, the cost of maintenance and repair of the cogeneration system increases, and the stability and reliability of the cogeneration system are reduced there was.

In addition, since the conventional cogeneration system and method using biogas are not easily packed with various components constituting the cogeneration system, the cogeneration system is difficult to install due to the large size of the cogeneration system, And the production cost is increased.

Korean Patent Registration No. 10-1439425 Korean Patent Laid-Open Publication No. 10-2015-0001832

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a cogeneration system that uses biogas as a fuel for a cogeneration system and generates electricity, while simultaneously using combustion heat and exhaust gas of an engine unit of a cogeneration system. The hot water circulating in the hot water supply line and the hot water collection line is heated to a predetermined temperature or more, In this case, the valve unit is controlled by the control of the control unit to maximize the stability and reliability of the cogeneration system, reduce the maintenance cost, optimize the size of the cogeneration system through the optimal packaging, Combined cogeneration system and cogeneration system using biogas Method.

In order to accomplish the object of the present invention, a cogeneration system using biogas according to the present invention comprises a biogas supply line for supplying biogas produced by a separate biogas processing unit, A gas mixer for mixing the compressed air supplied through the supercharger with the external air passed through the air filter unit, an intercooler for cooling the mixed gas mixed through the gas mixer, And a control unit connected to the drive shaft of the engine unit to generate electricity, and a control unit. The cogeneration system includes a biogas supply unit A dehumidifying part installed on the line for removing moisture of the biogas; A reverse osmosis part installed between the dehumidifying part and the gas mixing part on the biogas supply line to prevent backflow of the biogas; A gas filter unit disposed between the backflow prevention part and the gas mixing part on the biogas supply line and filtering the biogas that has passed through the backflow prevention part; A gas pressure regulating unit installed between the gas filter unit and the gas mixing unit on the biogas supply line to regulate the pressure of the biogas that has passed through the gas filter unit; A first cooling unit for cooling the intercooler unit; A first cooling line having one side connected to the intercooler part and the other side connected to the first cooling part; A first circulation pump unit installed on the first cooling line for circulating cooling water flowing in the first cooling line; A waste heat recovery heat exchanger for primarily heating the hot water supplied by the hot water supply line by the heat generated by the engine; An SCR disposed on an exhaust gas discharge line of the engine for purifying the exhaust gas discharged from the engine; An exhaust gas exhaust line disposed on the exhaust gas discharge line to heat the hot water primarily heated through the waste heat recovery heat exchanger by the exhaust gas passing through the SCR, and to discharge the hot water, which is secondarily heated through the intermediate- A gas heat exchanger; A noise reduction unit installed at a front end of the exhaust gas discharge line to reduce noise of the exhaust gas discharged through the exhaust gas heat exchanger; A second cooling unit for cooling the engine unit; A second cooling line having one side connected to the engine unit and the other side connected to the second cooling unit; And a second circulation pump unit installed on the second cooling line for circulating the cooling water flowing in the second cooling line.

In another preferred embodiment of the cogeneration system using biogas according to the present invention, the control unit of the cogeneration system using biogas further comprises a cooling water circulating in the first cooling line, the cooling water circulating in the second cooling line The operation of the first cooling unit, the first circulation pump unit, the second cooling unit, and the second circulation pump unit can be controlled to be low.

In another preferred embodiment of the cogeneration system using biogas according to the present invention, the cogeneration system using biogas has a valve unit installed between the SCR and the exhaust gas heat exchange unit on the exhaust gas discharge line. A middle-temperature water temperature sensor installed on the middle-temperature water supply line and the middle-temperature water recovery line for measuring a temperature of hot water flowing in the middle-temperature water supply line and the middle-temperature water recovery line; And a bypass line connected to the valve unit on one side and to the exhaust gas discharge line between the exhaust gas heat exchanger and the noise reduction unit.

In another preferred embodiment of the cogeneration system using biogas according to the present invention, the control unit of the cogeneration system using biogas is configured such that the hot water in the middle-temperature water recovery line flowing through the medium- The control unit controls the valve unit so that the exhaust gas passing through the SCR is prevented from flowing into the exhaust gas heat exchanging unit and the bypass line is opened, and the control unit controls the valve unit such that the intermediate temperature water sensor When the hot water flowing through the line is below a predetermined temperature, exhaust gas having passed through the SCR flows into the exhaust gas heat exchanger, and the valve unit can be controlled so that the bypass line is closed.

According to another aspect of the present invention, there is provided a cogeneration method using biogas, comprising: supplying biogas produced in a separate biogas processing unit through a biogas supply line; Compressing and supplying the exhaust gas on the exhaust gas discharge line in the supercharger; Mixing the compressed air compressed in the gas mixing unit and the outside air passed through the air filter unit and flowing in; Cooling the mixed gas in the intercooler section; Generating electricity through a power generation unit connected to a drive shaft of the engine unit using a mixed gas as a fuel in an engine unit; Cooling the engine section; Heating the hot water supplied through the hot water supply line by the heat generated in the engine unit in the waste heat recovery heat exchanger; Purifying the exhaust gas discharged from the engine unit in the SCR; Heating the hot water primarily heated through the waste heat recovering heat exchanger by the exhaust gas passed through the SCR in the exhaust gas heat exchanger, and discharging the finally heated hot water through the low temperature water recovery line; Wherein the step of cooling the mixed gas in the intercooler part comprises the step of cooling the first cooling part with the cooling water circulating the first cooling line by the first circulation pump part And cooling the engine part, the cooling water circulating through the second cooling line is cooled by the second circulation pump part through the second cooling part, and the control part controls the cooling water circulating through the first cooling line, The operation of the first cooling unit, the first circulation pump unit, the second cooling unit, and the second circulation pump unit can be controlled so as to be lower than the cooling water circulating the cooling line.

In another preferred embodiment of the cogeneration system using biogas according to the present invention, the method of cogeneration using biogas is a method of removing the moisture contained in the biogas supplied from the dehumidifying part after the step of supplying the biogas, ; Adjusting the negative pressure of the biogas to prevent the backflow of the biogas from which water has been removed from the backfill section; Filtering the biogas whose negative pressure is controlled by the gas filter unit; And maintaining the pressure of the biogas filtered by the gas pressure regulator at a reference pressure.

In another preferred embodiment of the cogeneration system using biogas according to the present invention, the method of cogeneration using biogas comprises the steps of: heating the hot water by a second order and discharging the finally heated hot water through a middle- And reducing the noise of the exhaust gas passing through the exhaust gas heat exchanger by the noise reducing unit.

The cogeneration system and the cogeneration system using biogas according to the present invention generate electricity by using biogas as a fuel for the cogeneration system and simultaneously heat the hot water using the combustion heat and the exhaust gas of the engine unit of the cogeneration system So that it is possible to improve the energy efficiency by supplying sufficient hot water and using such hot water as a heating energy source.

In the cogeneration system and the cogeneration system using biogas according to the present invention, when the hot water circulating in the intermediate-temperature water supply line and the intermediate-temperature water recovery line is at a predetermined temperature or more, the control unit controls the valve unit, To prevent the secondary heating of the hot water, thereby maximizing the stability and reliability of the cogeneration system and preventing the breakage or damage of each component to reduce the maintenance cost and maintenance time and to ensure the safe operation of the cogeneration system There is an effect that can be achieved.

Further, the cogeneration system and the cogeneration method using the biogas according to the present invention can reduce the installation cost and the installation time by securing the ease of installation by reducing the size of the equipment through optimal packaging of each component, It is possible to increase the spread of the cogeneration system.

In addition, the cogeneration system and the cogeneration method using biogas according to the present invention reduce the installation cost and manufacturing cost due to the miniaturization and increase the supply, so that they can be easily installed at necessary places such as farmhouses, It is possible to prevent environmental pollution by the use of coal fuels and to reduce waste of resources by reducing the use of coal fuel.

1 is a conceptual diagram of a schematic process of a cogeneration system using biogas.
FIG. 2 is a flowchart illustrating an overall flow of a cogeneration system using biogas according to an embodiment of the present invention.
3 is an external view of a main configuration of a cogeneration system using biogas according to an embodiment of the present invention.
FIG. 4 is a conceptual diagram illustrating a heat exchange process of a waste heat recovery heat exchanger in a cogeneration system using biogas according to an embodiment of the present invention using a biogas according to an embodiment of the present invention.
5 is a side cross-sectional view of a waste heat recovery heat exchanger of a cogeneration system using biogas according to an embodiment of the present invention using biogas according to an embodiment of the present invention.
FIG. 6 is a conceptual view illustrating a structure of a plate portion of a waste heat recovery heat exchanger of a cogeneration system using biogas according to an embodiment of the present invention using biogas according to an embodiment of the present invention.
7 is a flow chart of a cogeneration method using biogas according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings of a prefabricated pillow. The following embodiments are provided by way of example so that those skilled in the art can fully understand the spirit of the present invention. Therefore, the present invention is not limited to the embodiments described below, but may be embodied in other forms. In the drawings, the size and thickness of an apparatus may be exaggerated for convenience. Like reference numerals designate like elements throughout the specification.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. However, it should be understood that the present invention is not limited to the embodiments disclosed herein but may be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification. The dimensions and relative sizes of the layers and regions in the figures may be exaggerated for clarity of illustration.

The terminology used herein is for the purpose of describing embodiments only and is not intended to be limiting of the invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. &Quot; comprise "and / or" comprising ", as used in the specification, means that the presence of stated elements, Or additions.

FIG. 2 is a flow diagram illustrating an overall flow of a cogeneration system using biogas according to an embodiment of the present invention. FIG. 3 is a schematic view of a main configuration of a cogeneration system using a biogas according to an embodiment of the present invention. Fig. FIG. 4 is a conceptual diagram illustrating a heat exchange process of a waste heat recovery heat exchanger in a cogeneration system using biogas according to an embodiment of the present invention using a biogas according to an embodiment of the present invention. FIG. FIG. 6 is a side cross-sectional view of a waste heat recovery heat exchanger in a cogeneration system using biogas according to an embodiment of the present invention using biogas according to an embodiment. FIG. 6 is a cross- A conceptual diagram of a structure of a plate portion of a waste heat recovery heat exchanger in a cogeneration system using biogas according to an embodiment of the present invention is shown. 7 is a flow chart of a cogeneration method using biogas according to an embodiment of the present invention.

Referring to FIGS. 2 and 3, a cogeneration system 100 using biogas according to an embodiment of the present invention will be described. 2 to 3, a cigarette cogeneration system 100 using a biogas according to an embodiment of the present invention includes a dehumidifying part 10, a backflow prevention part 11, a gas filter part 12, a gas The first circulation pump unit 22, the waste heat recovery heat exchange unit 30, the SCR 31, the exhaust gas heat exchange unit (not shown), the first cooling unit 20, the first cooling unit 21, 32, a noise reduction unit 33, a second cooling unit 40, a second cooling line 41, and a second circulation pump unit 42.

As described above, the cigarette cogeneration system 100 using the biogas according to an embodiment of the present invention also includes the biogas supply line 1, the exhaust gas discharge line 2, the supercharger 3, the gas An intercooling unit 6, an engine unit 7, a power generation unit 8, and a control unit 9, as shown in FIG.

The biogas supply line 1 supplies biogas produced by a separate biogas processing unit. That is, the biogas generated by digesting the organic waste in the anaerobic digestion tank is supplied through the biogas supply line 1.

The dehumidifying part 10 is installed on the biogas supply line 1 to remove moisture of the biogas. As the temperature and the pressure decrease or increase when the biogas is generated by the combustion digestion tank through the combustion, the water vapor in the biogas is condensed in the biogas supply line (1) and the condensate of the liquid state is accumulated to increase the overall efficiency of the cogeneration system . If such condensed water accumulates, it is deposited on the wall surface of the biogas supply line 1 to reduce the effective space to cause a pressure loss, which makes the gas flow unstable and hinders stable operation of the cogeneration system. That is, the dehumidifying unit 10 is an essential step in the biogas pretreatment process, and it can maximize the efficiency of the cogeneration system by removing moisture in the biogas through various methods and supplying the moisture through the biogas supply line 1 .

The backflow prevention part 11 is installed between the dehumidifying part 10 and the gas mixing part 5 on the biogas supply line 1 to prevent the backflow of the biogas. That is, when the biogas from which moisture is removed is supplied through the biogas supply line 1, the backflow prevention part 11 controls the negative pressure so that the flame is backed up and does not cause an explosion, thereby preventing explosion by backfire .

The gas filter unit 12 is installed between the inverted portion 11 and the gas mixing unit 5 on the biogas supply line 1 and filters the biogas that has passed through the inverted portion 11. [ That is, the gas filter unit 12 filters the impurities contained in the biogas supplied through the biogas supply line 1 and supplies the filtered impurities to the gas mixing unit 5, Can be increased.

The gas pressure regulating unit 13 is disposed between the gas filter unit 12 and the gas mixing unit 5 on the biogas supply line 1 to regulate the pressure of the biogas that has passed through the gas filter unit 12. In other words, the gas pressure regulating section 13 regulates or pressurizes the biogas such that the pressure of the biogas passing through the gas filter section 12 does not exceed the reference pressure under the control of the control section 9, To the gas mixing section 5 to increase the energy efficiency and increase the stability and reliability of the cogeneration system.

2, a biogas-based cogeneration system 100 according to another embodiment of the present invention includes a biogas supply line 1, a gas pressure regulator 13, and a gas mixer 5, And an emergency valve unit 14 installed in the main body of the vehicle.

When the temperature and pressure of the biogas supplied through the biogas supply line (1) through the gas pressure regulating part (13) exceeds the reference temperature or the reference pressure, or when the impurities exceed the predetermined amount The flow of the gas from the biogas supply line 1 to the gas mixing section 5 is closed. Accordingly, supply of fuel to the engine section 7 from the gas mixing section 5 is blocked to prevent a safety accident, thereby preventing personnel accidents and maximizing the safety and reliability of the cogeneration system.

The supercharger 3 compresses and supplies the exhaust gas on the exhaust gas discharge line. The supercharger 3 also compresses the air introduced from the outside and supplies it to the gas mixer 5. [ The output of the engine section 7 is maximized by the supercharging section 3, so that the energy efficiency and the overall efficiency are increased.

The gas mixing section 5 mixes the compressed air supplied through the supercharging section 3 and the introduced external air passing through the air filter section 4. [ The outside air passing through the air filter unit 4 is removed from the impurities and the efficiency of the engine unit 7 using the mixed gas as fuel is increased.

The intercooler section (6) cools the mixed gas mixed through the gas mixing section (5). That is, the intercooler unit 6 prevents the combustion efficiency of the engine unit 7 from being reduced when the temperature of the mixed gas is increased through the supercharger 3 and supplied to the engine unit 7 at a high temperature to be burned , The mixed gas in a high temperature state is cooled to prevent the engine part 7 from being overheated and damaged or broken, thereby increasing the density of the mixed air and maintaining the constant temperature. So as to cool the temperature of the mixed gas.

The first cooling section 20 cools the intercooler section 6.

The intercooler section (6) and the first cooling section (20) are connected by a first cooling line (21). That is, one side of the first cooling line 21 is connected to the intercooler unit 6, and the other side of the first cooling line 21 is connected to the first cooling unit 20.

The first circulation pump section 22 is installed on the first cooling line 21 for circulating the cooling water flowing in the first cooling line 21.

The engine unit 7 drives the mixed gas that has passed through the intercooler unit 6 as fuel.

The second cooling section 40 cools the engine section 7.

The engine section (7) and the second cooling section (40) are connected by the second cooling line (41). That is, one side of the second cooling line 41 is connected to the engine section 7, and the other side of the second cooling line 41 is connected to the second cooling section 40.

The second circulation pump unit 42 is installed on the second cooling line 41 for circulating the cooling water flowing inside the second cooling line.

2 and 3, the first and second cooling units 20 and 40 for cooling the intercooler unit 6 and the engine unit 7, the first and second circulation pumps 20 and 40, The sections 22 and 42 are disposed at the upper end of the engine section 7 so as to facilitate connection with the first and second cooling lines 21 and 41, respectively. 3, in the enclosure housing of the cogeneration system 100 using biogas, the first and second circulation pump units 22 and 42 are connected to an intercooler unit 6 And the first and second cooling lines 21 and 41 are directly connected to the engine unit 7 and the engine unit 7 to cool the intercooler unit 6 and the engine unit 7 when the intercooler unit 6 and the engine unit 7 are overheated, The piping can be easily connected to the first and second cooling units 20 and 40 disposed on the upper portion of the enclosure. Accordingly, the cogeneration system 100 using the biogas according to the present invention can be miniaturized by optimization, thereby increasing the ease of installation and installation convenience, increasing the penetration rate by reducing the manufacturing cost and installation cost, The environment can be protected.

The first cooling unit 20 and the second cooling unit 40 may be made of a radiator. This radiator is a water-cooled type of fin and tube structure. The inner core is composed of a cooling water tube, which is a passage through which the cooling water circulates, and a cooling pin, between the tube and the tube so as to efficiently discharge the heat of the cooling water. It is made of material tube and aluminum cooling pin. The cooling line is connected to the nozzle attached to the rear end of the radiator so as to form a structure in which the cooling water is introduced and discharged, and circulated by the circulation pump part. Such a radiator is installed so as to be disposed outside the upper portion of the enclosure since it continuously discharges heat to the outside by the fan.

The control unit 9 controls the first cooling unit 20 and the first circulation pump unit 22 so that the cooling water circulating through the first cooling line 21 is lower in temperature than the cooling water circulating through the second cooling line 41, And the operation of the second cooling section (40) and the second circulation pump section (42). Accordingly, efficiency of the cogeneration system 100 is increased, unnecessary energy waste is prevented, and heating can be performed by the hot water discharged through the exhaust gas heat exchanger 32, which will be described later.

Public water (water) is connected to the first and second cooling lines 21 so that the cooling water can be easily supplied.

The power generation section 8 is connected to the drive shaft of the engine section 7 to produce electricity.

The control unit 9 controls the biogas cogeneration system as a whole. The control unit 9 is provided with a display unit for displaying the current operation state, the mixed gas temperature, the pressure, the intermediate temperature water recovery line to be described later, and the temperature and pressure of the hot water circulating in the intermediate temperature water supply line. And an operation panel provided with a button portion.

The waste heat recovery heat exchange unit 30 primarily heats the hot water supplied by the intermediate-temperature water supply line 51 by the heat generated in the engine unit 7.

The SCR 31 is installed on the exhaust gas discharge line 2 of the engine section 7 for purifying the exhaust gas discharged from the engine section 7. SCR selectively reduces nitrogen oxides and other atmospheric hazardous substances issued according to the environmental regulations required by each country.

The mixture gas is burned in the engine section 7 to produce electricity according to the thermal efficiency of the engine section 7, but approximately half or more is released by heat to the atmosphere. The waste heat recovery heat exchange unit 30 and the exhaust gas heat exchange unit 32 heat such heat to supply hot water by heating water or to heat the hot water where necessary, thereby maximizing the efficiency of the cogeneration system.

The exhaust gas heat exchanging unit 32 heats the hot water primarily heated through the waste heat recovering heat exchanging unit 31 by the exhaust gas passed through the SCR 31 to a second order through the medium temperature recovery line 52, And is installed on the exhaust gas discharge line (2) to discharge heated hot water.

The noise reducing section 33 is provided at the front end of the exhaust gas discharge line 2 in order to reduce the noise of the exhaust gas discharged through the exhaust gas heat exchanging section 32. In order to reduce the size of the cogeneration system 100 using the biogas, the noise reduction unit 33 may be installed at the upper end of the outer side of the enclosure, as shown in FIG. It is possible to reduce the noise of the exhaust gas discharged by the noise reduction unit, to facilitate the user's convenience, and to easily meet the conditions for the environmental regulation and the like.

2 and 3, an exhaust fan 34 may be installed in a part of the enclosure housing of the cogeneration system to introduce air into the cogeneration system or to allow air to flow out of the enclosure.

Accordingly, the cogeneration system and the cogeneration system using biogas according to the present invention generate electricity by using the biogas as the fuel of the cogeneration system, and simultaneously generate heat by using the combustion heat and the exhaust gas of the engine unit of the cogeneration system. To provide sufficient hot water and to use this hot water as a heating energy source to improve energy efficiency. By optimizing the packaging of each component, it is possible to reduce the size of the equipment, And solve the problem due to the installation space limitation, thereby increasing the spread of the cogeneration system.

2, the biogas-based cogeneration system 100 according to an embodiment of the present invention further includes a valve unit 50, a cold water sensing unit 53, and a bypass line 54 can do.

The valve portion 50 is installed on the exhaust gas discharge line 2 between the SCR 31 and the exhaust gas heat exchange portion 32. Preferably, the valve portion 50 may be formed of a three-way valve. The three-way valve is formed of a motor-operated valve or a solenoid valve, and controls three (3) open / close (open / close) of the three-way valve according to the signal of the control unit 8.

The intermediate-temperature water temperature detection unit 53 is provided on the intermediate-temperature water supply line 51 and the intermediate-temperature water recovery line 52 and detects the temperature of the hot water flowing in the intermediate-temperature water supply line 51 and the intermediate- Measure the temperature. Although not limited thereto, the intermediate temperature water temperature sensor 53 is formed of a temperature sensor and can transmit signals to the controller 8 through a wireless communication method.

One side of the bypass line 54 is connected to the valve unit 50 and the other side of the bypass line 54 is connected to the exhaust gas discharge line 2 between the exhaust gas heat exchange unit 32 and the noise reduction unit 33. [ As shown in FIG.

The controller 9 controls the exhaust gas heat exchanger 32 so that exhaust gas having passed through the SCR 31 is exhausted to the exhaust gas heat exchanger 32 when the hot water flowing through the intermediate- And controls the valve unit 50 so that the bypass line 54 is opened.

When the hot water flowing through the intermediate-temperature water collection line 52 as a result of the measurement by the intermediate-temperature water temperature sensor 53 is lower than the predetermined temperature, the control unit 9 controls the exhaust gas passing through the SCR 31 to flow into the exhaust gas heat exchanger 32, and controls the valve unit 50 so that the bypass line 54 is closed.

That is, when the hot water flowing through the intermediate-temperature water recovery line 52 as a result of the measurement of the intermediate-temperature water temperature detection unit 53 is 150 degrees or more, the valve unit 50 is operated by the control signal of the control unit 9, The flow line of the unit 32 is shut off and the bypass line 54 is opened to exhaust the exhaust gas passing through the SCR 31 directly to the outside through the noise reduction unit 33. When the hot water flowing in the intermediate-temperature water recovery line 52 is less than 150 degrees as a result of the measurement of the intermediate-temperature water temperature detection unit 53, the valve unit 50 is operated by the control signal of the control unit 9 to operate the exhaust gas heat exchange unit 32, and cuts off the bypass line 54. In this way, Accordingly, the exhaust gas that has passed through the SCR 31 flows into the exhaust gas heat exchange unit 32 to perform secondary heat exchange with the intermediate-temperature water, and the intermediate-temperature water heated by the secondary heat exchange is supplied to the hot water supply line It is possible to maximize the efficiency and to ensure the stability and reliability of the cogeneration system and to prevent breakage or damage of each component, thereby reducing the maintenance cost and maintenance time, thereby increasing the penetration rate.

4 to 6, the waste heat recovery heat exchanger 30 of the cigarette cogeneration system 100 using biogas according to an embodiment of the present invention includes a first fixed frame part 310, A plate portion 330, an upper guide bar 340, a lower guide bar 350, a support frame portion 360, and a fastening bolt 370.

The first fixing frame part 310 is provided on one side of a plurality of plate parts 330 to be described later together with the second fixing frame part 320 and is fastened with a fastening bolt 370 to the second fixing frame part 320 And supports a plurality of plates 330.

The second fixing frame part 320 is provided on the other side of the plurality of plate parts 330 so as to be parallel to the first fixing frame part 320 and is fastened to the fastening bolt 370 with the first fixing frame part 320 Thereby supporting a plurality of plates 330. [

The plate portion 330 is formed in the shape of a metal plate having high conductivity, and a plurality of the first plate portion 310 and the second plate portion 320 are stacked. As shown in FIG. 4, each of the plate portions 330 is formed with a corrugated portion 331 having various shapes and angles to improve the heat conduction efficiency. As shown in FIG. 4, the adjacent plate portions 330 are installed such that the directions of the corrugated portions 331 are staggered from each other. As a result, the fluid passing through it is uniformly distributed to the plate portion, forming a turbulent flow, and performing the anti-current motion, thereby increasing the heat exchange efficiency.

As shown in FIG. 6, the plate portion 330 has a high-temperature fluid inlet 332 formed at an upper portion thereof and a high-temperature fluid outlet 333 formed at a lower portion thereof on one side with respect to the center line. The plate portion 330 is formed with a low temperature fluid outlet 335 at the upper portion of the other side with respect to the center line so as to be parallel to the high temperature fluid inlet 332 and the high temperature fluid outlet 333, (334) is formed. That is, a total of two inlets and two outlets are formed on the center line of the plate portion 330 to perform heat exchange by the corrugated portion 331 of the plate portion while circulating the fluid.

6, the plate portion 330 of the waste heat recovery heat exchanger 30 of the cigarette cogeneration system using biogas according to an exemplary embodiment of the present invention includes a high temperature fluid inlet 332 And the low-temperature fluid inlet 334 are provided so as to be staggered at the upper portion and the lower portion. Since the high-temperature fluid inlet 332 and the low-temperature fluid inlet 334 are staggered and the corrugated portion 331 is staggered between adjacent plate portions 300, the heat exchange efficiency through the plate portion 330 Is maximized.

In Figure 6, the hot fluid inlets and outlets 332 and 333 are located on the left side of the plate portion 330 at the left side of the plate portion 330 and the hot fluid inlets 332 are at the upper left side of the plate portion 330 and the cold fluid inlets and outlets 334 and 335 The low temperature fluid inflow port 334 is shown on the right side of the plate portion 330 and the low temperature fluid inflow port 334 is disposed on the lower right side of the plate portion 330. However, the present invention is not limited thereto. And the like.

In addition, the gasket is coupled to the plate portion 330 to completely prevent the fluid from flowing out to the outside.

The support frame part 360 is installed so as to be parallel to the first fixed frame part 310 and the second fixed frame part 320 and spaced apart from the second fixed frame part 320 by a predetermined distance. The support frame portion 36 and the second fixed frame portion 320 are coupled by the upper guide bar 340 and the lower guide bar 350. The plate portion 330 can be firmly supported by the support frame portion 360, the upper guide bar 340 and the lower guide bar 350 to maintain durability.

A plurality of fastening bolts 370 are provided on the first and second fastening frame portions 310 and 320 to fasten the first fastening frame portion 310 and the second fastening frame portion 320 together, do.

Accordingly, in the cogeneration system using biogas according to the present invention, the waste heat recovery heat exchanging part 30 is formed in the form of a plate heat exchanger, and the heat exchange heat exchanging part 30 is heat exchanged by the arrangement of the corrugated part, the hot fluid inlet and outlet, As the efficiency is maximized, the efficiency of the overall cogeneration system can be improved.

Referring to FIG. 7, a method of cogeneration using biogas according to an embodiment of the present invention will be described.

And supplies biogas produced by a separate biogas processing unit through a biogas supply line.

After the step (S1) of supplying the biogas, moisture contained in the biogas supplied from the dehumidifying part is removed.

After the biogas moisture removal step (S2), the negative pressure of the biogas is controlled to prevent the backflow of the biogas from which moisture has been removed from the backfill section.

After the biogas backfill prevention step (S3), the biogas whose negative pressure is regulated in the gas filter section is filtered.

After the biogas filtration step (S4), the pressure of the biogas filtered in the gas pressure regulator is maintained at the reference pressure.

After the biogas pressure regulation step (S5), the supercharger compresses and supplies the exhaust gas on the exhaust gas discharge line.

The biogas moisture removal step S2, the biogas backfill prevention step S3, the biogas filtration step S4, and the biogas pressure control step S5 constitute a step of pretreating the produced biogas.

Although not shown in FIG. 7, after the biogas pressure regulating step S5, the biogas gas supplied through the biogas supply line 1 through the gas pressure regulating part 13 by the emergency valve part 14 When the temperature and pressure exceed the reference temperature or the reference pressure or when the impurities exceed the predetermined amount, it is operated by the signal of the control section 9 to change the flow rate from the biogas supply line 1 to the gas mixing section 5 (S5-1). Accordingly, supply of fuel to the engine section 7 from the gas mixing section 5 is blocked to prevent a safety accident, thereby preventing personnel accidents and maximizing the safety and reliability of the cogeneration system.

After the exhaust gas compression and supply step (S7), the compressed air compressed by the gas mixing section and the external air passed through the air filter section are mixed.

After the gas mixing step (S8), the intercooler portion cools the gas mixture.

After the mixed gas cooling step (S9), a mixed gas is used as fuel in the engine section, and electricity is generated through the generator section connected to the drive shaft of the engine section.

After the engine part drive and electricity production step (S9), the engine part is cooled.

After the engine section cooling step (S10), the hot water supplied through the intermediate-temperature water supply line is primarily heated by the heat generated in the engine section in the waste heat recovery heat exchange section.

After the hot water first heating step (S11), the exhaust gas discharged from the engine part is cleaned in the SCR.

After the exhaust gas purifying step (S12), when the control unit determines that the hot water flowing through the intermediate-temperature water recovery line is higher than the predetermined temperature as a result of measurement by the intermediate-temperature water temperature sensing unit, the exhaust gas passing through the SCR is prevented from flowing into the exhaust gas heat- The valve unit is controlled to open the pass line, and when the hot water flowing through the intermediate-temperature water return line is lower than the predetermined temperature, exhaust gas passing through the SCR flows into the exhaust gas heat exchanger and the valve unit is controlled so that the bypass line is closed. As described above, in the cogeneration method using biogas according to the present invention, when the hot water circulating in the intermediate-temperature water supply line and the intermediate-temperature water recovery line is at a predetermined temperature or more, the control unit controls the valve unit, By preventing the secondary heating, it maximizes the stability and reliability of the cogeneration system and prevents the damage or damage of each component parts, thereby reducing the maintenance cost and maintenance time, and enabling safe operation of the cogeneration system .

When the exhaust gas is not bypassed by the exhaust gas bypass determination step S13, after the exhaust gas purification step (S12), exhaust gas having passed through the SCR in the exhaust gas heat exchanger performs primary And then discharges the finally heated hot water through the medium-temperature water recovery line.

After the second step of heating the hot water (S14), the noise reduction unit reduces the noise of the exhaust gas passing through the exhaust gas heat exchange unit.

After the exhaust gas noise reduction step (S15), the exhaust gas that has passed through the noise reduction section is discharged to the outside through the exhaust gas discharge line.

After the exhaust gas discharging step (S16), the exhaust gas is easily discharged through the fan to the outside of the enclosure of the cogeneration system through the exhaust fan.

The step (S8) of cooling the mixed gas in the intercooler section cools the cooling water circulating the first cooling line by the first circulation pump section through the first cooling section.

The step S10 of cooling the engine part cools the cooling water circulating the second cooling line by the second circulation pump part through the second cooling part.

At this time, the control unit controls the first cooling unit, the first circulation pump unit, the second cooling unit, and the second cooling unit so that the cooling water circulating through the first cooling line is lower in temperature than the cooling water circulating through the second cooling line. And controls the operation of the circulation pump section. Therefore, it is possible to reduce the maintenance cost by keeping the electric power consumption to a minimum, to maximize the efficiency of the cogeneration system, to minimize the size of the equipment through optimum packaging of each component, It is possible to reduce the time, solve the problems due to the installation space limitation, increase the spread of the cogeneration system, prevent environmental pollution by the organic waste, reduce the use of coal fuel, and prevent resource waste.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, 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. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims.

1: biogas supply line, 2: exhaust gas discharge line,
3: supercharger, 4: air filter,
5: gas mixing part, 6: intercooler part,
7: engine section, 8: power generating section,
9: control unit, 10: dehumidifying unit,
11: reverse side branch portion, 12: gas filter portion,
13: gas pressure regulating part, 14: emergency valve part,
20: first cooling section, 21: first cooling line,
22: first circulation pump unit, 30: waste heat recovery heat exchange unit,
31: SCR, 32: exhaust gas heat exchanger,
33: Noise reduction section, 34: Exhaust fan,
40: second cooling section, 41: second cooling line,
42: second circulation pump unit, 50: valve unit,
51: medium-temperature water supply line, 52: medium-temperature water recovery line,
53: Heavy water temperature detection unit, 54: Bypass line.

Claims (7)

A biogas supply line for supplying biogas produced by a separate biogas processing unit; a supercharger for compressing and supplying exhaust gas on the exhaust gas discharge line; An intercooler for cooling the mixed gas mixed through the gas mixer, an engine for driving the mixed gas passing through the intercooler as fuel, And a control unit connected to the power generation unit and the control unit, the cogeneration system using biogas,
A dehumidifier disposed on the biogas supply line to remove moisture of the biogas;
A reverse osmosis part installed between the dehumidifying part and the gas mixing part on the biogas supply line to prevent backflow of the biogas;
A gas filter unit disposed between the backflow prevention part and the gas mixing part on the biogas supply line and filtering the biogas that has passed through the backflow prevention part;
A gas pressure regulating unit installed between the gas filter unit and the gas mixing unit on the biogas supply line to regulate the pressure of the biogas that has passed through the gas filter unit;
A first cooling unit for cooling the intercooler unit;
A first cooling line having one side connected to the intercooler part and the other side connected to the first cooling part;
A first circulation pump unit installed on the first cooling line for circulating cooling water flowing in the first cooling line;
A waste heat recovery heat exchanger for primarily heating the hot water supplied by the hot water supply line by the heat generated by the engine;
An SCR disposed on an exhaust gas discharge line of the engine for purifying the exhaust gas discharged from the engine;
An exhaust gas exhaust line disposed on the exhaust gas discharge line to heat the hot water primarily heated through the waste heat recovery heat exchanger by the exhaust gas passing through the SCR, and to discharge the hot water, which is secondarily heated through the intermediate- A gas heat exchanger;
A noise reduction unit installed at a front end of the exhaust gas discharge line to reduce noise of the exhaust gas discharged through the exhaust gas heat exchanger;
A second cooling unit for cooling the engine unit;
A second cooling line having one side connected to the engine unit and the other side connected to the second cooling unit; And
And a second circulation pump unit installed on the second cooling line for circulating cooling water flowing in the second cooling line.
The method according to claim 1,
Wherein the control unit controls the first cooling unit, the first circulation pump unit, the second cooling unit, and the second circulation pump such that the cooling water circulating through the first cooling line is lower in temperature than the cooling water circulating through the second cooling line, Wherein the control unit controls the operation of the auxiliary unit.
3. The method of claim 2,
A valve disposed between the SCR and the exhaust gas heat exchanger on the exhaust gas discharge line;
A middle-temperature water temperature sensor installed on the middle-temperature water supply line and the middle-temperature water recovery line for measuring a temperature of hot water flowing in the middle-temperature water supply line and the middle-temperature water recovery line; And
And a bypass line connected to the exhaust gas discharge line between the exhaust gas heat exchanger and the noise reduction unit, wherein the bypass line is connected to the valve unit, and the bypass line is connected to the exhaust gas discharge line. Power generation system.
The method of claim 3,
Wherein the control unit stops the flow of the exhaust gas having passed through the SCR to the exhaust gas heat exchanger when the warm water flowing through the intermediate temperature water recovery line is higher than a predetermined temperature as a result of the measurement by the intermediate temperature water temperature sensor, The control unit controls the valve unit so that,
Wherein the control unit controls the exhaust gas heat exchanger so that exhaust gas passing through the SCR flows into the exhaust gas heat exchanger when the hot water flowing through the intermediate temperature water recovery line is lower than a predetermined temperature as a result of the measurement by the intermediate temperature water temperature sensing unit, And the valve unit is controlled based on the control signal.
Supplying biogas produced in a separate biogas processing unit through a biogas supply line;
Compressing and supplying the exhaust gas on the exhaust gas discharge line in the supercharger;
Mixing the compressed air compressed in the gas mixing unit and the outside air passed through the air filter unit and flowing in;
Cooling the mixed gas in the intercooler section;
Generating electricity through a power generation unit connected to a drive shaft of the engine unit using a mixed gas as a fuel in an engine unit;
Cooling the engine section;
Heating the hot water supplied through the hot water supply line by the heat generated in the engine unit in the waste heat recovery heat exchanger;
Purifying the exhaust gas discharged from the engine unit in the SCR;
Heating the hot water primarily heated through the waste heat recovering heat exchanger by the exhaust gas passed through the SCR in the exhaust gas heat exchanger, and discharging the finally heated hot water through the low temperature water recovery line; And
And exhausting the exhaust gas to the outside through the exhaust gas discharge line,
Wherein the step of cooling the mixed gas in the intercooler part comprises cooling the cooling water circulating through the first cooling line by the first circulation pump part through the first cooling part,
Wherein the step of cooling the engine unit is performed by cooling the second cooling unit with the cooling water circulating through the second cooling line by the second circulation pump unit,
The control unit controls the first cooling unit and the first circulation pump unit, the second cooling unit, and the second circulation pump unit so that the cooling water circulating through the first cooling line is lower in temperature than the cooling water circulating through the second cooling line. Wherein the operation of the cogeneration system using biogas is controlled.
6. The method of claim 5,
After the step of supplying the biogas,
Removing moisture contained in the biogas supplied from the dehumidifying part;
Adjusting the negative pressure of the biogas to prevent the backflow of the biogas from which water has been removed from the backfill section;
Filtering the biogas whose negative pressure is controlled by the gas filter unit; And
And maintaining the pressure of the biogas filtered by the gas pressure regulator at a reference pressure.
The method according to claim 6,
After the step of heating the hot water secondarily and discharging the finally heated hot water through the hot water collection line,
And reducing the noise of the exhaust gas passing through the exhaust gas heat exchanging unit by the noise reducing unit.

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