KR102650467B1 - Biogas Mixing Burner System And Control Method Thereof - Google Patents

Abstract

The present invention provides a burner system for biogas co-firing and a control method thereof that can mix low-calorie biogas generated in a sewage treatment plant with liquefied gas and use biogas and liquefied gas in parallel.
The burner system for biogas co-firing of the present invention includes a biogas storage unit where biogas is stored; A gas supply pipe in which liquefied gas is stored; A mixing tank unit in which a mixed gas of the first biogas moving in the biogas storage unit and the first liquefied gas moving in the gas supply pipe is stored; a combustion unit in which the mixed gas moving in the mixing tank unit is combusted; a blower that supplies external air to the combustion unit; a heat exchange unit in which exhaust gas of the mixed gas burned in the combustion unit exchanges heat with another heat transfer medium; an exhaust fan unit that accelerates the exhaust gas heat exchanged in the heat exchange unit; and a chimney unit through which exhaust gas accelerated by the exhaust fan unit is discharged to the outside.

Description

Biogas mixing burner system and control method thereof}

The present invention relates to a burner system for biogas co-firing and a control method thereof. More specifically, the present invention relates to a burner system for biogas co-firing and a control method thereof. More specifically, the present invention relates to a biogas mixer system in which biogas and liquefied gas can be used in parallel by mixing low-calorie biogas generated in a sewage treatment plant with liquefied gas. It relates to a burner system and a control method thereof.

When sewage, food waste, excrement, etc. from a sewage treatment plant are placed in a sealed storage tank digester, gas is generated as they decay and decompose. This gas is generated when organic waste decomposes, so it is called biogas. Biogas consists of 50-65% methane, 25-40% carbon dioxide, and small amounts of hydrogen and hydrogen sulfide.

In addition, sewage sludge generated in sewage treatment plants has a lot of moisture and is sticky, so it must be dried and treated. For this purpose, large amounts of LNG or LPG are used to dry sewage sludge. If biogas containing methane generated from a sewage treatment plant is used in a drying facility for drying sewage sludge, there are several advantages such as the use of renewable energy and reduction of energy costs.

Republic of Korea Patent Publication No. 10-1737235 Republic of Korea Patent Publication No. 10-2029573 Republic of Korea Patent Publication No. 10-2318108 Republic of Korea Patent Publication No. 10-2017-0143153

The present invention is intended to solve the above problems, and provides a burner system for biogas co-firing that can use biogas and liquefied gas in parallel by mixing low-calorie biogas generated in a sewage treatment plant with liquefied gas and a control method thereof. The purpose is to provide

In order to achieve the above object, a burner system for biogas co-firing according to an embodiment of the present invention includes a biogas storage unit in which biogas is stored; A gas supply pipe in which liquefied gas is stored; A mixing tank unit storing a mixed gas of the first biogas moving from the biogas storage unit and the first liquefied gas moving from the gas supply pipe; A mixing module located between the biogas storage unit and the gas supply pipe and the mixing tank unit, mixing the first biogas moving in the biogas storage unit and the first liquefied gas moving in the gas supply pipe; a combustion unit in which the mixed gas moving in the mixing tank unit is combusted; a blower that supplies external air to the combustion unit; a heat exchange unit in which exhaust gas of the mixed gas burned in the combustion unit exchanges heat with another heat transfer medium; an exhaust fan unit that accelerates the exhaust gas heat exchanged in the heat exchange unit; a chimney unit through which exhaust gas accelerated by the exhaust fan unit is discharged to the outside; And a control panel unit that is electrically connected to and controls the blower unit, the discharge fan unit, the first valve module, the second valve module, and the biogas tank level unit, wherein the liquefied gas is either LNG or LPG, The heat transfer medium of the heat exchange unit is characterized in that it is any one of sewage, sludge, gas, and water from a sewage treatment plant.

a first valve module into which the first mixed gas moving from the mixing tank unit and the second liquefied gas moving from the gas supply pipe are introduced; and a second valve module into which the second mixed gas moving from the mixing tank unit and the second biogas moving from the biogas storage unit are introduced. A burner system for biogas co-firing, comprising a.

It further includes a biogas tank level unit that checks the amount of biogas stored inside the biogas storage unit, and the biogas tank level unit checks that the biogas inside the biogas storage unit is less than a first certain amount. When this happens, the second valve module is turned off, and when the biogas inside the biogas storage unit is checked to be less than a second certain amount lower than the first certain amount, the outflow of biogas from the biogas storage unit is blocked. Do it as Therefore, the amount of biogas stored in the biogas storage unit is divided and managed into a first constant amount and a second constant amount to determine whether to block the biogas storage unit or control the valve module.

In order to achieve the above object, there is a control method of a burner system for biogas co-firing according to an embodiment of the present invention, comprising: a first step in which the first biogas stored in the biogas storage unit is moved to the mixing tank unit; A second step in which the first liquefied gas stored in the gas supply pipe is moved to the mixing tank unit; Before the first biogas of the first stage and the first liquefied gas of the second stage are moved to the mixing tank unit, the biogas is stored in a mixing module located between the biogas storage unit and the gas supply pipe and the mixing tank unit. A third step in which the first biogas moving from the unit and the first liquefied gas moving from the gas supply pipe are mixed; A fourth step in which the first mixed gas moving from the mixing tank unit and the second liquefied gas moving from the gas supply pipe are introduced into the first valve module; A fifth step in which the second mixed gas moving from the mixing tank unit and the second biogas moving from the biogas storage unit are introduced into the second valve module; A sixth step in which either the first mixed gas and the second liquefied gas of the fourth step is combusted in the combustion section or one of the second mixed gas and the second biogas of the fifth step is burned in the combustion section; A seventh step in which the exhaust gas after combustion in the sixth step is heat exchanged in a heat exchanger; and an eighth step in which the exhaust gas heat-exchanged in the seventh step is accelerated by the exhaust fan unit and discharged to the outside through the chimney unit.

The liquefied gas stored in the gas supply pipe is divided into a first liquefied gas that moves to the mixing module through a gas branch point and a second liquefied gas that moves to the first valve module, and the biogas stored in the fresh biogas storage unit is biogas. It is divided into first biogas moving to the mixing module through a branch point and second biogas moving to the second valve module, and the first valve module is opened and closed so that the first mixed gas can be supplied to the combustion unit. 1. It has an automatic valve and a second automatic valve that opens and closes so that the second liquefied gas can be supplied to the combustion unit, and the second valve module has a third automatic valve that opens and closes so that the second mixed gas can be supplied to the combustion unit, It is provided with a fourth automatic valve that opens and closes so that the second biogas can be supplied to the combustion unit, and the intensity of the thermal power is defined as the first thermal power being greater than the second thermal power, and the second thermal power being greater than the third thermal power. When the first fire power is needed, the control panel unit closes the first automatic valve and operates the second automatic valve to supply the second liquefied gas to the combustion unit, and when the second fire power is needed, the second automatic valve is closed. closes and operates the first automatic valve to supply the first mixed gas to the combustion section, or closes the fourth automatic valve and operates the third automatic valve to supply the second mixed gas to the combustion section, When third thermal power is required, the third automatic valve is closed and the fourth automatic valve is operated to supply the second biogas to the combustion unit.

As described above, the present invention has the advantage of reducing costs compared to the case of using either conventional LNG or LPG by burning biogas generated in a sewage treatment plant and using biogas as renewable energy.

Figure 1(a) shows a schematic diagram of a burner system for biogas co-firing according to an embodiment of the present invention, and Figure 1(b) shows a schematic diagram of the flows of liquefied gas and biogas of the present invention.
Figure 2 is a cross-sectional view of a mixing module according to an embodiment of the present invention.
Figure 3 is a flowchart of a control method of a burner system for biogas co-firing according to an embodiment of the present invention.

Since the present invention can make various changes and have various embodiments, specific embodiments will be illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all changes, equivalents, and substitutes included in the spirit and technical scope of the present invention. While describing each drawing, similar reference numerals are used for similar components.

Terms such as first, second, A, B, etc. may be used to describe various components, but the components should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another.

For example, a first component may be named a second component, and similarly, the second component may also be named a first component without departing from the scope of the present invention. The term “and/or” includes any of a plurality of related stated items or a combination of a plurality of related stated items.

When a component is said to be "connected" or "connected" to another component, it is understood that it may be directly connected to or connected to the other component, but that other components may exist in between. It should be. On the other hand, when it is mentioned that a component is “directly connected” or “directly connected” to another component, it should be understood that there are no other components in between.

The terms used in this application are only used to describe specific embodiments and are not intended to limit the invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, terms such as “comprise” or “have” are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but are not intended to indicate the presence of one or more other features. It should be understood that this does not exclude in advance the possibility of the existence or addition of elements, numbers, steps, operations, components, parts, or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the technical field to which the present invention pertains. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and unless explicitly defined in the present application, should not be interpreted in an ideal or excessively formal sense. No.

Hereinafter, the configuration of a burner system for biogas co-firing according to an embodiment of the present invention will be described with reference to the drawings. Figure 1 is a schematic diagram of a burner system for biogas co-firing according to an embodiment of the present invention. Referring to Figure 1, the burner system for biogas co-firing according to an embodiment of the present invention includes a biogas storage unit 10, a gas supply pipe 20, a mixing module 30, a mix tank unit 40, and a first Valve module 50, second valve module 60, combustion unit 70, blowing unit 80, heat exchange unit 90, discharge fan unit 100, chimney unit 110, biogas tank level unit (120) ) and a control panel unit 130. Here, the biogas storage unit 10, the gas supply pipe 20, the mixing module 30, the mixing tank unit 40, the first valve module 50, the second valve module 60, and the combustion unit 70. It is connected to a pipe through which gas can move, and each pipe is equipped with a valve to control the movement of gas.

The biogas storage unit 10 supplies biogas. Biogas is a gas produced when organic waste resources such as food waste, livestock manure, and sewage sludge are decomposed by microorganisms in the absence of air. It contains 50-65% methane, 25-40% carbon dioxide, small amounts of hydrogen, hydrogen sulfide, etc. It consists of The present invention purifies carbon dioxide and other impurities from biogas generated from sewage waste, sludge, etc. in a sewage treatment plant, stores it in the biogas storage unit (10), and uses it. The biogas generated from the sealed storage tank digester goes through a purification facility and is stored in the biogas storage unit (10). Additionally, the biogas of the present invention includes landfill gas.

The gas supply pipe 20 stores or supplies liquefied gas. Liquefied gas is supplied from a liquefied gas supply facility. Liquefied gas of the present invention means LNG gas or LPG gas. For example, the first liquefied gas means the first LNG gas or the first LPG gas, and the second liquefied gas means the second LNG gas or the second LPG gas.

The liquefied gas (①) supplied to the gas supply pipe 20 moves to the first liquefied gas (②) moving to the mixing module 30 and the first valve module 50 through the liquefied gas branch point (r). It is divided into a second liquefied gas (③), and the biogas (④) stored in the biogas storage unit 10 is a first biogas (⑤) that moves to the mixing module 30 through the biogas branch point (s). ) and the second biogas (⑥) moving to the second valve module 60, and the mixed gas (⑦) flowing out of the mixing module 30 passes through the mixing tank unit 40 and flows to the first valve. The module 50 has a first automatic valve that opens and closes so that the first mixed gas (⑧) can be supplied to the combustion unit and a second automatic valve that opens and closes so that the second liquefied gas (③) can be supplied to the combustion unit (70). It is provided with a valve, and the second valve module 60 is a third automatic valve that opens and closes so that the second mixed gas ⑨ can be supplied to the combustion unit 70, and the second biogas ⑥ is supplied to the combustion unit 70. It is provided with a fourth automatic valve that opens and closes so that supply can be supplied to (70).

The mixing module 30 is located between the biogas storage unit 10 and the gas supply pipe 20 and the mixing tank unit 40, and the first biogas moving from the biogas storage unit 10 and the gas supply pipe 20 ) and mix the moving first liquefied gas. Biogas contains methane as its main ingredient, and has a calorific value of about 4,600 kcal/Nm ³ , which is lower than LNG/LPG, which has a calorific value of 9,530 kcal/Nm ³ . Therefore, in the present invention, LNG/LPG with high calorific value and biogas with lower calorific value are mixed at an appropriate ratio and burned.

Figure 2 is a cross-sectional view of the mixing module 30 according to an embodiment of the present invention. Referring to FIG. 2(a), the mixing module 30 moves in the biogas entry part 31, where the first biogas moving from the biogas storage unit 10 enters, and the gas supply pipe 20. A gas entry part 32 into which the first liquefied gas enters, a gas mixing part 33 into which the first biogas and the first liquefied gas are mixed, and a mixing tank where the mixed gas mixed in the gas mixing part 33 It may be configured to include a mixed gas discharge unit 34 discharged into the unit 40. Referring to FIG. 2(b), when observing the internal cross section at point A of the gas mixing unit 33, the first area forms a spiral-shaped barrier, and the second area forms a barrier through which the mixed gas moves. By forming a path, the mixed gas is mixed while passing through the inside of the gas mixing section 33. The spiral-shaped barrier is formed repeatedly at a certain period, and the cycle can become shorter as it approaches the mixed gas discharge unit 35, so that the mixed gas contacts the barrier rather than when formed at the same pitch. This can increase the mixing ratio. Referring to FIG. 2(c), the barrier may be provided with a plurality of holes, and the size of the holes increases in the direction from the center of the gas mixing section 33 toward the inner surface of the gas mixing section 33. Accordingly, a strong flow of mixed gas from the center passes through a small hole with strong pressure, and as it moves away from the center, a weak mixed gas flows through a wide hole with low pressure, thereby increasing gas mixing efficiency.

If the internal shape of the gas mixing unit 33 is spiral, there is an advantage that the biogas and LNG gas or LPG gas flowing into the mixing module 30 can be uniformly mixed while rotating along the spiral shape.

The mixing tank unit 40 stores a mixed gas of the first biogas moving from the biogas storage unit 10 and the first liquefied gas moving from the gas supply pipe 20. When the first biogas and the first liquefied gas are mixed in the mixing module 30, the mixed gas moves along the pipe to the mixing tank unit 40 and is stored in the mixing tank unit 40. The mixed gas stored in the mixing tank unit 40 moves through two pipes, with the first mixed gas and the second mixed gas moving through each pipe.

The first mixed gas moving from the mixing tank unit 40 and the second liquefied gas moving from the gas supply pipe 20 are introduced into the first valve module 50. The first mixed gas moving in the mixing tank unit 40 and the second liquefied gas moving in the gas supply pipe 20 are burned in the combustion unit 70 through the first valve module 50. The first valve module 50 supplies the first mixed gas or the second liquefied gas to the combustion unit 70. The calorific value of the first mixed gas is higher than that of biogas and lower than that of the liquefied gas. The first valve module 50 can select between the first mixed gas and the second liquefied gas and supply it to the combustion unit 70. The first valve module 50 includes a first automatic valve that opens and closes so that the first mixed gas can be supplied to the combustion unit 70, and a second automatic valve that opens and closes so that the second liquefied gas can be supplied to the combustion unit 70. 2 Equipped with an automatic valve.

The second mixed gas moving from the mixing tank unit 40 and the second biogas moving from the biogas storage unit 10 are introduced into the second valve module 60. The second mixed gas moving from the mixing tank unit 40 and the second biogas moving from the biogas storage unit 10 are burned in the combustion unit 70 through the second valve module 60. The second valve module 60 supplies the second mixed gas or the second biogas to the combustion unit 70. The calorific value of the second mixed gas is higher than that of biogas and lower than that of the liquefied gas. The calorific value of the second biogas is lower than that of the second mixed gas. The second valve module 60 can select between the second mixed gas and the second biogas and supply it to the combustion unit 70. The second valve module 60 includes a third automatic valve that opens and closes so that the second mixed gas can be supplied to the combustion unit 70, and a third automatic valve that opens and closes so that the second biogas can be supplied to the combustion unit 70. 4 Equipped with an automatic valve.

In the combustion unit 70, the mixed gas moving from the mixing tank unit 40 is combusted. The mixed gas stored in the mixing tank unit is supplied to the first valve module 50 or the second valve module 60 and moves to the combustion unit 70 for combustion. In addition, the liquefied gas supplied from the gas supply pipe is supplied to the combustion unit 70 through the first valve module 50, and the biogas stored in the biogas storage unit 10 is supplied through the second valve module 60. It is supplied to the combustion unit (70). The combustion unit 70 is equipped with a burner for co-combustion that can burn mixed gas, liquefied gas, and biogas. The co-firing burner mixes fuel using an external mixing method, and the fuel injection method can use a multi spud type. The burner for co-firing can be made of one or more of special alloys, high-grade cast iron, and stainless steel and heat-resistant steel. The co-firing burner of the combustion unit 70 burns the mixed gas, liquefied gas, and biogas supplied from the first valve module 50 or the second valve module 60 with external air supplied from the blower 80. Sludge drying work in a sewage treatment plant can be performed using the heat generated in the combustion unit 70.

The blowing unit 80 supplies external air to the combustion unit 70. The blowing unit rotates the fan using a drive motor to supply external air to the combustion unit (70). The blower 80 supplies external air so that the mixed gas is smoothly burned in the combustion unit 70 by oxygen contained in the external air.

The heat exchange unit 90 exchanges heat with the exhaust gas of the mixed gas burned in the combustion unit 70 and other heat transfer media. The high-temperature exhaust gas generated in the combustion unit 70 is cooled to a low temperature through the heat exchange unit 90 before being discharged to the outside. The high-temperature exhaust gas passes through the upper and lower parts of the heat exchange unit 90, and the heat transfer medium moves along a pipe formed in a spiral shape inside the heat exchange unit 90, absorbing heat energy of the high-temperature exhaust gas. The heat transfer medium of the heat exchange unit 90 may be any one of sewage, sludge, gas, and water from a sewage treatment plant. When the heat exchange unit 90 is used, a liquid or gaseous heat transfer medium moves through a pipe formed in a spiral shape inside the heat exchange unit 90, absorbing heat energy of high-temperature exhaust gas, and exhaust gas generated in the combustion unit 70. There is an advantage in that it can be used again to heat the heat transfer medium.

The exhaust fan unit 100 accelerates the exhaust gas heat-exchanged in the heat exchange unit 90. Since the exhaust gas passing through the heat exchange unit 90 loses heat energy and has poor mobility, the drive motor and fan of the exhaust fan unit 100 are operated to accelerate the exhaust gas and discharge it through the chimney unit 110.

The chimney unit 110 discharges the exhaust gas accelerated by the exhaust fan unit 100 to the outside. The chimney unit 110 is a long structure and may have a structure in which the inner diameter decreases toward the top so that exhaust gas can be easily discharged.

The biogas tank level unit 120 checks the amount of biogas stored inside the biogas storage unit 10. The biogas tank level unit 120 is equipped with a pressure gauge to check the pressure inside the biogas storage unit 10 to measure the amount of biogas. When the biogas tank level unit 120 checks that the biogas inside the biogas storage unit 10 is below a certain amount, the second valve module 60 is turned off. The biogas tank level unit 120 and the second valve module 60 are electrically connected by the control panel 130 and are operated by control commands from the control panel 130. Since the purpose of the biogas co-firing burner system of the present invention is to use biogas, which is a renewable energy, when the storage amount of biogas falls below a certain level, it is necessary to stop the operation of the second valve module 60 and charge the biogas. There is. Since the first valve module 50 has a high specific gravity of liquefied gas, it continues to supply liquefied gas or mixed gas to the combustion unit 70 to prevent the combustion operation of the combustion unit 70 from being interrupted, and the second valve module 60 stops the operation of

The control panel unit 130 electrically connects and controls the blower unit 80, the discharge fan unit 100, the first valve module 50, the second valve module 60, and the biogas tank level unit 120. . The control panel 130 includes operation of the drive motor of the blower unit 80, operation of the drive motor of the discharge fan unit 100, operation of the first and second automatic valves of the first valve module 50, and operation of the second automatic valve of the first valve module 50. Controls the operation of the third and fourth automatic valves of the valve module 60 and the numerical measurement of the biogas tank level unit 120. The control panel unit 130 has a circuit board on which a PLC (Programmable Logic Controller) program is input, and the blower unit 80, the exhaust fan unit 100, the first valve module 50, and the second valve module 50 are operated by the PLC program. Controls the operation of the valve module 60 and the biogas tank level unit 120. The control panel unit 130 selectively selects the first mixed gas of the first valve module 50, the second liquefied gas, the second mixed gas of the second valve module 60, and the second biogas to the combustion unit 70. The first to fourth automatic valves are controlled so that supply is supplied. If the intensity of the thermal power is defined as having the first thermal power > the second thermal power > the third thermal power, the turndown ratio of the combustion unit 70 may be 3:1, and the control panel unit 130 operates when the first thermal power is needed. The second liquefied gas can be supplied to the combustion unit 70 by operating the second automatic valve of the first valve module 50, and when the second thermal power is required, the first automatic valve of the first valve module 50 can be operated to supply the first mixed gas to the combustion unit 70, or the third automatic valve of the second valve module 60 can be operated to supply the second mixed gas to the combustion unit 70, 3 When thermal power is required, the fourth automatic valve of the second valve module 60 can be operated to supply the second biogas to the combustion unit 70. Therefore, it is possible to obtain specific thermal power by appropriately controlling the first to fourth automatic valves. In addition, when the control panel unit 130 confirms that the biogas inside the biogas storage unit 10 is below a certain amount by the biogas tank level unit 120. The fourth automatic valve of the second valve module 60 is turned off to prevent the second biogas from moving to the combustion unit 70.

Hereinafter, a control method of a burner system for biogas co-firing according to an embodiment of the present invention will be described with reference to the drawings. Figure 3 is a flowchart of a control method of a burner system for biogas co-firing according to an embodiment of the present invention. Referring to FIG. 3, the control method of the burner system for biogas co-firing according to an embodiment of the present invention may include the following eight steps.

First step (S10): A step in which the first biogas stored in the biogas storage unit 10 is moved to the mixing tank unit 40.

Second step (S20): A step in which the first liquefied gas supplied to the gas supply pipe 20 is moved to the mixing tank unit 40.

Third step (S30): Before the first biogas of the first step (S10) and the first liquefied gas of the second step (S20) are moved to the mixing tank unit 40, the biogas storage unit 10 and The first biogas moved from the biogas storage unit 10 and the first liquefied gas moved from the gas supply pipe 20 are mixed in the mixing module 30 located between the gas supply pipe 20 and the mixing tank unit 40. stages of becoming

Fourth step (S40): A step in which the first mixed gas moved from the mixing tank unit 40 and the second liquefied gas moved from the gas supply pipe 20 are introduced into the first valve module 50.

Fifth step (S50): A step in which the second mixed gas moved from the mixing tank unit 50 and the second biogas moved from the biogas storage unit 10 are introduced into the second valve module 60.

Sixth step (S60): A step in which the first mixed gas or second liquefied gas of the fourth step (S40) or the second mixed gas or second biogas of the fifth step (S50) is burned in the combustion unit 70

Seventh step (S70): A step in which the exhaust gas after combustion in the sixth step (S60) is heat exchanged in the heat exchange unit 90.

8th step (S80): A step in which the exhaust gas heat-exchanged in the 7th step (S70) is accelerated by the discharge fan unit 100 and discharged to the outside through the chimney unit 110.

The first step (S10) is a step in which the first biogas stored in the biogas storage unit 10 is moved to the mixing tank unit 40. The first biogas and the second biogas are moved in the biogas storage unit 10. The first biogas is mixed with the first liquefied gas in the mixing module 30 and used as a mixed gas, and the second biogas is mixed with the first liquefied gas in the mixing module 30. is supplied to the combustion unit 70 through the second valve module 60 in a state that is not mixed with the liquefied gas. The first biogas is moved to the mixing tank unit 40 through the mixing module 30 and stored in a mixed state.

The second step (S20) is a step in which the first liquefied gas stored in the gas supply pipe 20 is moved to the mixing tank unit 40. The first liquefied gas and the second liquefied gas are moved in the gas supply pipe 20. The first liquefied gas is mixed with the first biogas in the mixing module 30 and used as a mixed gas, and the second liquefied gas is used as a biogas. It is supplied to the combustion unit 70 through the first valve module 50 in a state that is not mixed with gas. The first liquefied gas is moved to the mixing tank unit 40 through the mixing module 30 and stored in a mixed state. The mixing tank unit 40 stores a mixed gas of biogas and liquefied gas.

Here, the biogas stored in the biogas storage unit 10 is divided into first biogas and second biogas through the biogas branch point, and the liquefied gas stored in the gas supply pipe 20 is divided into the first liquefied gas through the liquefied gas branch point. and second biogas.

In the third step (S30), before the first biogas of the first step (S10) and the first liquefied gas of the second step (S10) are moved to the mixing tank unit 40, the biogas storage unit 10 and The first biogas moved from the biogas storage unit 10 and the first liquefied gas moved from the gas supply pipe 20 are mixed in the mixing module 30 located between the gas supply pipe 20 and the mixing tank unit 40. This is the stage where it becomes possible. The gas mixing unit 33 of the mixing module 30 is in the form of a spiral, and the first biogas and the first liquefied gas entering the mixing module 30 are uniformly mixed while passing through the gas mixing unit 33. The mixed mixed gas moves to the mixing tank unit 40 through the pipe.

The fourth step (S40) is a step in which the first mixed gas moving from the mixing tank unit 40 and the second liquefied gas moving from the gas supply pipe 20 are introduced into the first valve module 50. The mixed gas stored in the mixing tank unit 40 is supplied as the first mixed gas or the second mixed gas. The first mixed gas moving in the mixing tank unit 40 and the second liquefied gas moving in the gas supply pipe 20 flow into the first valve module 50 and are selectively burned by the first valve module 50. It is supplied to unit 70. The first valve module 50 supplies the second liquefied gas with high calorific value to the combustion unit 70 when a strong first thermal power is required in the combustion unit 70, and the combustion unit 70 provides a medium thermal power. When a second thermal power is required, a first mixed gas with a lower calorific value than liquefied gas but a higher calorific value than biogas is supplied to the combustion unit 70. Gas is selectively supplied from the first valve module 50 by the operation of the first automatic valve and the second automatic valve, and the operation of the first automatic valve and the second automatic valve is by the control panel unit 130. It is controlled.

The fifth step (S50) is a step in which the second mixed gas moved from the mixing tank unit 40 and the second biogas moved from the biogas storage unit 10 are introduced into the second valve module 60. The second mixed gas moving from the mixing tank unit 40 and the second biogas moving from the biogas storage unit 10 flow into the second valve module 60, and are selectively removed by the second valve module 60. is supplied to the combustion unit 70. When a second, intermediate thermal power is required in the combustion unit 70, the second valve module 60 supplies a second mixed gas with a lower calorific value than liquefied gas but a higher calorific value than biogas to the combustion unit 70. When the combustion unit 70 requires a third thermal power with weak thermal power, the second biogas with a lower calorific value than the mixed gas is supplied to the combustion unit 70. Gas is selectively supplied from the second valve module 60 by the operation of the third and fourth automatic valves, and the operation of the third and fourth automatic valves is performed by the control panel unit 130. It is controlled.

The sixth step (S60) is a step in which the first mixed gas or second liquefied gas of the fourth step (S40) or the second mixed gas or second biogas of the fifth step (S50) is burned in the combustion unit 70. am. When gas is selectively supplied from the first valve module 50 and the second valve module 60, the combustion unit 70 receives oxygen from the blower 80 and combusts the gas. Sewage sludge, etc. can be dried by combustion of gas.

The seventh step (S70) is a step in which the exhaust gas after combustion in the sixth step (S60) is heat exchanged in the heat exchange unit 90. After the mixed gas, liquefied gas, and biogas are burned in the combustion unit 70, high-temperature exhaust gas is generated. The high-temperature exhaust gas exchanges heat with the heat transfer medium through the heat exchange unit 90 to transfer heat energy to the heat transfer medium. Deliver. As a heat transfer medium, sewage, sludge, gas, and water from a sewage treatment plant can be used.

The eighth step (S80) is a step in which the exhaust gas heat-exchanged in the seventh step (S70) is accelerated by the discharge fan unit 100 and discharged to the outside through the chimney unit 110. The exhaust gas that has completed heat exchange by the heat exchange unit 90 is accelerated by operating the drive motor and fan of the discharge fan unit 100, moves to the chimney unit 110, and is discharged to the outside through the chimney unit 110.

The present invention is not limited to the above-mentioned embodiments, but can be manufactured in various different forms, and those skilled in the art may manufacture the present invention in other specific forms without changing the technical idea or essential features of the present invention. You will understand that it can be done. Therefore, the embodiments described above should be understood in all respects as illustrative and not restrictive.

10: Biogas storage unit
20: gas supply pipe
30: mixing module
31: Biogas entry section
32: gas entry part
33: Gas mixing section
34: mixed gas outlet
40: mixing tank part
50: first valve module
60: second valve module
70: Combustion unit
80: blowing unit
90: heat exchange unit
100: Discharge fan part
110: chimney
120: Biogas tank level part
130: control panel part

Claims (6)

A biogas storage unit where biogas is stored;
A gas supply pipe through which liquefied gas is supplied;
A mixing tank unit storing a mixed gas of the first biogas moving from the biogas storage unit and the first liquefied gas moving from the gas supply pipe;
A mixing module located between the biogas storage unit and the gas supply pipe and the mixing tank unit, mixing the first biogas moving in the biogas storage unit and the first liquefied gas moving in the gas supply pipe;
a combustion unit in which the mixed gas moving in the mixing tank unit is combusted;
a blower that supplies external air to the combustion unit;
a heat exchange unit in which exhaust gas combusted in the combustion unit exchanges heat with another heat transfer medium;
an exhaust fan unit that accelerates the exhaust gas heat exchanged in the heat exchange unit; and
It includes a chimney unit through which exhaust gas accelerated by the exhaust fan unit is discharged to the outside,
The liquefied gas is either LNG or LPG,
The heat transfer medium of the heat exchange unit is any one of sewage, sludge, gas, and water from a sewage treatment plant,
a first valve module into which the first mixed gas moving from the mixing tank unit and the second liquefied gas moving from the gas supply pipe are introduced; And a second valve module into which the second mixed gas moving from the mixing tank unit and the second biogas moving from the biogas storage unit are introduced,
The mixing module includes a biogas inlet into which the first biogas moving from the biogas storage unit enters, a gas inlet into which the first liquefied gas moving from the gas supply pipe enters, the first biogas and the first liquefaction It includes a gas mixing section where gases are mixed and a mixed gas discharge section through which the mixed gas mixed in the gas mixing section is discharged to the mixing tank section,
A biogas tank level unit that checks the amount of biogas stored inside the biogas storage unit; and
It further includes a control panel unit that is electrically connected to and controls the blower unit, the discharge fan unit, the first valve module, the second valve module, and the biogas tank level unit,
When defining the storage amount of biogas inside the biogas storage unit as a first constant amount and the storage amount lower than the first constant amount as the second constant amount, the biogas inside the biogas storage unit is If it is checked that the range is less than the first certain amount or more than the second certain amount, the second valve module is turned off to block the flow of the second mixed gas and the second biogas to the second valve module, and the biogas storage unit A burner for biogas co-firing, characterized in that when the internal biogas is checked to be within a range of a second certain amount or less, the valve provided in the biogas storage unit is blocked to prevent biogas from flowing out of the biogas storage unit. system. delete delete delete A method of controlling a burner system for biogas co-firing of claim 1, comprising: a first step in which the first biogas stored in the biogas storage unit is moved to the mixing tank unit; A second step in which the first liquefied gas stored in the gas supply pipe is moved to the mixing tank unit; Before the first biogas of the first stage and the first liquefied gas of the second stage are moved to the mixing tank unit, the biogas is stored in a mixing module located between the biogas storage unit and the gas supply pipe and the mixing tank unit. A third step in which the first biogas moving from the unit and the first liquefied gas moving from the gas supply pipe are mixed; A fourth step in which the first mixed gas moving from the mixing tank unit and the second liquefied gas moving from the gas supply pipe are introduced into the first valve module; A fifth step in which the second mixed gas moving from the mixing tank unit and the second biogas moving from the biogas storage unit are introduced into the second valve module; A sixth step in which either the first mixed gas and the second liquefied gas of the fourth step is combusted in the combustion section or one of the second mixed gas and the second biogas of the fifth step is burned in the combustion section; A seventh step in which the exhaust gas after combustion in the sixth step is heat exchanged in a heat exchanger; and an eighth step in which the exhaust gas heat-exchanged in the seventh step is accelerated by the discharge fan and discharged to the outside through the chimney. In claim 5,
The liquefied gas supplied from the gas supply pipe is divided into a first liquefied gas moving to the mixing module through the liquefied gas branch point and a second liquefied gas moving to the first valve module, and the biogas stored in the biogas storage unit is It is divided into first biogas moving to the mixing module through the biogas junction and second biogas moving to the second valve module, and the first valve module opens and closes so that the first mixed gas can be supplied to the combustion unit. It has a first automatic valve and a second automatic valve that opens and closes so that the second liquefied gas can be supplied to the combustion unit, and the second valve module has a third automatic valve that opens and closes so that the second mixed gas can be supplied to the combustion unit. It is provided with a fourth automatic valve that opens and closes so that the valve and the second biogas can be supplied to the combustion unit, and the intensity of the thermal power is defined as the first thermal power being greater than the second thermal power, and the second thermal power being greater than the third thermal power. , the control panel unit operates the second automatic valve when the first thermal power is needed to supply the second liquefied gas to the combustion unit, and operates the first automatic valve when the second thermal power is required to supply the second automatic valve to the combustion unit. 1 Supply the mixed gas to the combustion unit or operate the third automatic valve to supply the second mixed gas to the combustion unit, and when the third thermal power is needed, operate the fourth automatic valve to supply the second biogas A control method of a burner system for biogas co-firing that ensures that is supplied to the combustion unit.