Boiler with packaged heat exchanger for superheated steam control

Abstract

The present invention relates to a boiler with a packaged heat exchanger in which a heating passage and a cooling passage are packaged to generate superheated steam through heat exchange by exhaust gas and to adjust the temperature of the superheated steam to a suitable level for the use through heat exchange with air.

Description

CROSS-REFERENCE TO RELATED APPLICATION

[0001] This application claims priority under 35 U.S.C § 119 to Korean Patent Application No. 10-2024-0089136, filed in the Korean Intellectual Property Office on Jul. 5, 2024, the entire contents of which are hereby incorporated by reference.BACKGROUND OF THE INVENTIONField of the Invention

[0002] The present invention relates to a boiler with a packaged heat exchanger in which a heating passage and a cooling passage are packaged to generate superheated steam through heat exchange by exhaust gas and to adjust the temperature of the superheated steam to a suitable level for the use through heat exchange with air.Background Art

[0003] Typically, industrial boilers are devices that generate steam and supply the steam in the state of saturated steam to a place requiring the use of energy.

[0004] The boilers contain saturated steam including moisture of a weak liquid state, When the steam is supplied to pipes, heat loss occurs outside the pipes, and some of the steam is condensed inside the pipes, leading to the generation of condensate.

[0005] Thus, the moisture contained in the saturated steam and the condensate generated during steam transport cause heat loss at a place where steam is used, and lead to water hammer in the steam system piping, adversely affecting the products.

[0006] To overcome the problems, a heat exchanger equipped with a superheated steam control means is packaged to a boiler to supply superheated steam with an appropriate temperature to a place requiring superheated steam.

[0007] However, the superheated steam from the heat exchanger needs to adjust superheating temperature to be suitable for the required temperature at a usage place. In relation to the adjustment of superheating temperature, traditionally, a method of spraying water to superheated steam to adjust the temperature has been adopted, but such a method is economically wasteful and unsuitable for accurately adjusting the temperature of the superheated steam to the desired level.PATENT LITERATUREPatent DocumentsPatent Document 1: Korean Patent No. 10-1453388 (Oct. 15, 2014)SUMMARY OF THE INVENTION

[0009] Accordingly, the present invention has been made to solve the above-mentioned problems occurring in the prior arts, and it is an objective of the present invention to provide a boiler with a packaged heat exchanger in which a heating passage and a cooling passage are packaged to generate superheated steam through heat exchange by exhaust gas and to adjust the temperature of the superheated steam to a suitable level for the use through heat exchange with air.

[0010] It is another objective of the present invention to provide a boiler with a packaged heat exchanger, which supplies preheated air, heated while passing through a cooling passage, as combustion air, and if necessary, and bypasses additional combustion air through an air control by a damper and supplies the combustion air to a burner, thereby enhancing combustion efficiency.

[0011] To accomplish the above object, according to the present invention, there is provided a boiler with a packaged heat exchanger, which includes a boiler body having a combustion chamber, and a burner for supplying flames to the combustion chamber of the boiler body, comprising: a heat exchanger for discharging superheated steam through heat exchange with saturated steam supplied from the boiler body; a diaphragm for dividing the heat exchanger; a heating passage arranged on one side of the diaphragm to generate superheated steam through heat exchange between the saturated steam of the heat exchanger and exhaust gases from the combustion chamber; and a cooling passage arranged on the other side of the diaphragm to lower the temperature of the superheated steam generated by the heating passage through heat exchange with air.

[0012] The air preheated through heat exchange with the heat exchanger while passing through the cooling passage is supplied to the burner for using the air as combustion air.

[0013] The boiler with a packaged heat exchanger further includes a damper for controlling the volume of air supplied to the cooling passage to adjust the temperature of the superheated steam.

[0014] The boiler with a packaged heat exchanger further includes a bypass passage which bypasses some of the air supplied by the damper to supply the air to the burner.

[0015] In addition, the boiler with a packaged heat exchanger further includes a blower capable of rotational speed control by an inverter to control the total volume of the air supplied to the damper.

[0016] As described above, according to the present invention, the boiler with a packaged heat exchanger for superheated steam control has the heat exchanger, in which the heating passage and the cooling passage are packaged, to generate superheated steam through heat exchange by exhaust gas and adjust the temperature of the superheated steam to a suitable level for the use through heat exchange with air, thereby controlling superheated steam.

[0017] Moreover, the boiler with a packaged heat exchanger for superheated steam supplies preheated air, heated while passing through the cooling passage, as combustion air, and if necessary, and bypasses additional combustion air through an air control by the damper and supplies the combustion air to the burner, thereby enhancing combustion efficiency.

[0018] In addition, the boiler with a packaged heat exchanger for superheated steam can supply superheated steam at an appropriate temperature for the usage place via the packaged heat exchanger without condensate formation, and can increase the heat recovery rate of exhaust gases of the boiler by using the preheated air for boiler combustion after heat exchange.BRIEF DESCRIPTION OF THE DRAWINGS

[0019] FIG. 1 is a perspective view of a boiler with a packaged heat exchanger for superheated steam according to the present invention.

[0020] FIG. 2 is a perspective view of the packaged heat exchanger in the boiler according to the present invention.

[0021] FIG. 3 is a front view of the packaged heat exchanger in the boiler according to the present invention.DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0022] Hereinafter, to describe operational advantages and objectives achieved by the implementation of the present invention, preferred embodiments of the present invention will be described.

[0023] Firstly, it will be understood that the words or terms used in the present invention are used to describe specific embodiments of the present invention and there is no intent to limit the present invention. The singular form of the components may be understood into the plural form unless otherwise specifically stated in the context. It should be also understood that the terms of ‘include’ or ‘have’ in the specification are used to mean that there are characteristics, numbers, steps, operations, components, parts, or combinations of the steps, operations, components and parts described in the specification and there is no intent to exclude existence or possibility of other characteristics, numbers, steps, operations, components, parts, or combinations of the steps, operations, components and parts.

[0024] In describing the present invention, detailed description of relevant known configuration or function will be omitted if it is determined that such description may make the substance of the present invention unclear.

[0025] As illustrated in FIGS. 1 to 3, a boiler with a packaged heat exchanger for superheated steam according to the present invention includes a boiler body 10, a burner 20, a heat exchanger 30, a diaphragm 40, a heating passage 50, and a cooling passage 60.

[0026] As illustrated in FIG. 1, the boiler body 10 according to the present invention includes a combustion chamber, and the burner 20 is mounted on the boiler body 10 to supply a flame to the combustion chamber by burning fuel.

[0027] Additionally, a blower 80 for supplying combustion air to the burner 20 may be positioned on one side of the boiler body 10.

[0028] As illustrated in FIGS. 1 to 3, the heat exchanger 30 according to the present invention is configured to discharge saturated steam, which is supplied from the boiler body 10, as superheated steam through heat exchange.

[0029] The heat exchanger 30 can be positioned at the front of the boiler body 10.

[0030] That is, the heat exchanger 30 may include a heat exchange case 31, and a heat transfer pipe 33 formed inside the heat exchange case 31. In this case, a saturated steam supply header 35 is equipped at an inlet of the heat transfer pipe 33 to introduce the saturated steam supplied from the boiler body 10 into the heat transfer pipe 33, and a superheated steam outlet header 37 is equipped at an outlet of the heat transfer pipe 33 to discharge the superheated steam resulting from the heat exchange.

[0031] That is, the saturated steam supplied from the boiler body 10 is supplied into the saturated steam supply header 35 through a supply pipe 11, and enters the heat transfer pipe 33. Thereafter, the saturated steam is superheated through heat exchange while passing through the heat transfer pipe 33, and then, is discharged through the superheated steam outlet header 37.

[0032] As described above, the superheated steam heated through the heat exchanger 30 can be supplied to a usage place. In this case, it is necessary to supply the superheated steam at a temperature suitable for the application.

[0033] Traditionally, water is sprayed into the heat transfer pipe 33 to control the temperature of the superheated steam. However, such a traditional method requires significant costs and is unsuitable for adjusting the temperature of the superheated steam to a desired level with a fine difference.

[0034] So, To overcome the issues, the present invention intends to adjust the temperature of the superheated steam to a suitable level for the usage place by utilizing air supplied by a blower 80.

[0035] Hereinafter, a configuration for adjustment of superheated steam temperature by air will be described.

[0036] As illustrated in FIGS. 1 to 3, the diaphragm 40 according to the present invention is configured to divide the heat exchanger 30 into a cooling space and a heating space.

[0037] That is, the diaphragm 40 divides the interior space of the heat exchange case 31 to form a heating passage 50 on one side, i.e., on the right side of diaphragm 40 as illustrated in FIG. 3, and a cooling passage 60 on the other side, i.e., on the left side of diaphragm 40 as illustrated in FIG. 3.

[0038] In this case, the heat transfer pipe 33 of the heat exchanger 30 may include a saturated steam heat transfer pipe 33a positioned above the heating passage 50, and a preheated air heat transfer pipe 33b positioned above the cooling passage 60.

[0039] As described above, a flow passage is divided into the heating passage 50 and the cooling passage 60 by the diaphragm 40, and the heat exchange action of the packaged heat exchanger 30 can be performed as follows.

[0040] Firstly, exhaust gases emitted from the boiler body 10 after combustion are introduced into the heating passage 50, so that superheated steam may be generated through heat exchange between the saturated steam passing through the heating passage 50 and the exhaust gases.

[0041] Next, the saturated steam passing through the heating passage 50 can be discharged as superheated steam of a heated state. In this case, to provide steam at a temperature suitable for use, air can be introduced into the cooling passage 60 by a blower 80. Therefore, the steam passing through the saturated steam heat transfer pipe 33a located in the heating passage 50 can be cooled by passing through the preheated air heat transfer pipe 33b situated in the cooling passage 60.

[0042] The superheated steam generated through the heat exchange can be adjusted to a temperature suitable for the usage place to be supplied. However, if the usage place requires steam in a superheated state, the air supplied to the cooling passage 60 can be blocked, and it can be implemented by a damper described later.

[0043] Particularly, during the heat exchange process, the air supplied to the cooling passage 60 can be heated through heat exchange while passing through the preheated air heat transfer pipe 33b to be preheated to a predetermined temperature. The preheated air can be supplied to the burner 20 for use as combustion air. For this purpose, a connection path 21 may be equipped to allow communication with the burner 20 below the cooling passage 60.

[0044] In this case, an exhaust gas inlet 51 may be positioned below the heating passage 50, and an exhaust gas outlet 53, through which the exhaust gases are discharged after heat exchange, may be located above the heating passage 50. The exhaust gas inlet 51 is the high-temperature side where exhaust gases enter, and the exhaust gas outlet 53 is the low-temperature side where the temperature-reduced exhaust gases are discharged.

[0045] Moreover, the cooling passage 60 may have an air inlet 61 positioned at the top to introduce air and an air outlet 63 at the bottom to discharge the air. The air discharged through the air outlet 63 is in a preheated state, and the preheated air can be supplied to the burner 20 through the connection path 21.

[0046] Meanwhile, a damper 70 may be further equipped to control the volume and direction of air supplied through an air passage according to the present invention.

[0047] The damper 70 according to the present invention can be positioned above the air passage and connected through the blower 80 and a duct 81. Thus, the damper 70 can regulate the volume of air supplied from the blower 80 and supply the air into the cooling passage 60.

[0048] The damper 70 is provided to control the volume of air supplied to the cooling passage 60. Furthermore, a bypass passage 90, which is connected to the connection path 21 of the burner 20 through an outlet 93 thereof, is further provided to supply additional air needed for combustion to the burner 20 by bypassing some of the air supplied from the blower 80.

[0049] The damper 70 includes a first supply part 71 connected to the inlet of the cooling passage 60, and a second supply part 73 connected to an inlet 91 of the bypass passage 90 positioned on one side of the cooling passage 60. In this case, the first supply part 71 includes a first adjustment member 71a for adjusting the opening level, and the second supply part 73 includes a second adjustment member 73a for adjusting the opening level.

[0050] Therefore, the air supplied from the blower 80 moves through the duct, and adjusts the volume of air supplied to the cooling passage 60 and / or the bypass passage 90 according to the opening level of the first and second adjustment members 71a and 73a.

[0051] Additionally, when the second adjustment member 73a is closed, the air supplied from the blower 80 is supplied into the cooling passage 60. In this case, the volume of air supplied into the cooling passage 60 can be adjusted by the opening level of the first adjustment member 71a.

[0052] Conversely, when the first adjustment member 71a is closed, the air supplied from the blower 80 is supplied into the bypass passage 90. In this case, the volume of air supplied into the bypass passage 90 can be adjusted by the opening level of the second adjustment member 73a.

[0053] In addition, the total volume control of the air supplied to the damper 70 according to the present invention can be achieved by controlling the rotational speed of the blower 80 through an inverter equipped on the blower 80.

[0054] As described above, the boiler according to the present invention includes the heat exchanger 30 where the heating passage 50 and the cooling passage 60 are packaged to generate superheated steam through heat exchange with exhaust gases and to adjust the temperature of the superheated steam through heat exchange with the air, thereby adjusting the temperature of the superheated steam to a suitable level for a usage place. Additionally, the preheated air heat-exchanged while passing through the cooling passage 60 can be supplied to the burner 20 as combustion air.

[0055] As described above, while the present invention has been described with reference to the embodiments illustrated in the drawings, it will be apparent to those skilled in the art that various modifications can be made to the above-described exemplary embodiments of the present disclosure without departing from the spirit or scope of the invention.

Examples

Embodiment Construction

[0022]Hereinafter, to describe operational advantages and objectives achieved by the implementation of the present invention, preferred embodiments of the present invention will be described.

[0023]Firstly, it will be understood that the words or terms used in the present invention are used to describe specific embodiments of the present invention and there is no intent to limit the present invention. The singular form of the components may be understood into the plural form unless otherwise specifically stated in the context. It should be also understood that the terms of ‘include’ or ‘have’ in the specification are used to mean that there are characteristics, numbers, steps, operations, components, parts, or combinations of the steps, operations, components and parts described in the specification and there is no intent to exclude existence or possibility of other characteristics, numbers, steps, operations, components, parts, or combinations of the steps, operations, components an...

CROSS-REFERENCE TO RELATED APPLICATION

[0001] This application claims priority under 35 U.S.C § 119 to Korean Patent Application No. 10-2024-0089136, filed in the Korean Intellectual Property Office on Jul. 5, 2024, the entire contents of which are hereby incorporated by reference.BACKGROUND OF THE INVENTIONField of the Invention

[0002] The present invention relates to a boiler with a packaged heat exchanger in which a heating passage and a cooling passage are packaged to generate superheated steam through heat exchange by exhaust gas and to adjust the temperature of the superheated steam to a suitable level for the use through heat exchange with air.Background Art

[0003] Typically, industrial boilers are devices that generate steam and supply the steam in the state of saturated steam to a place requiring the use of energy.

[0004] The boilers contain saturated steam including moisture of a weak liquid state, When the steam is supplied to pipes, heat loss occurs outside the pipes, and some of the steam is condensed inside the pipes, leading to the generation of condensate.

[0005] Thus, the moisture contained in the saturated steam and the condensate generated during steam transport cause heat loss at a place where steam is used, and lead to water hammer in the steam system piping, adversely affecting the products.

[0006] To overcome the problems, a heat exchanger equipped with a superheated steam control means is packaged to a boiler to supply superheated steam with an appropriate temperature to a place requiring superheated steam.

[0007] However, the superheated steam from the heat exchanger needs to adjust superheating temperature to be suitable for the required temperature at a usage place. In relation to the adjustment of superheating temperature, traditionally, a method of spraying water to superheated steam to adjust the temperature has been adopted, but such a method is economically wasteful and unsuitable for accurately adjusting the temperature of the superheated steam to the desired level.PATENT LITERATUREPatent DocumentsPatent Document 1: Korean Patent No. 10-1453388 (Oct. 15, 2014)SUMMARY OF THE INVENTION

[0009] Accordingly, the present invention has been made to solve the above-mentioned problems occurring in the prior arts, and it is an objective of the present invention to provide a boiler with a packaged heat exchanger in which a heating passage and a cooling passage are packaged to generate superheated steam through heat exchange by exhaust gas and to adjust the temperature of the superheated steam to a suitable level for the use through heat exchange with air.

[0010] It is another objective of the present invention to provide a boiler with a packaged heat exchanger, which supplies preheated air, heated while passing through a cooling passage, as combustion air, and if necessary, and bypasses additional combustion air through an air control by a damper and supplies the combustion air to a burner, thereby enhancing combustion efficiency.

[0011] To accomplish the above object, according to the present invention, there is provided a boiler with a packaged heat exchanger, which includes a boiler body having a combustion chamber, and a burner for supplying flames to the combustion chamber of the boiler body, comprising: a heat exchanger for discharging superheated steam through heat exchange with saturated steam supplied from the boiler body; a diaphragm for dividing the heat exchanger; a heating passage arranged on one side of the diaphragm to generate superheated steam through heat exchange between the saturated steam of the heat exchanger and exhaust gases from the combustion chamber; and a cooling passage arranged on the other side of the diaphragm to lower the temperature of the superheated steam generated by the heating passage through heat exchange with air.

[0012] The air preheated through heat exchange with the heat exchanger while passing through the cooling passage is supplied to the burner for using the air as combustion air.

[0013] The boiler with a packaged heat exchanger further includes a damper for controlling the volume of air supplied to the cooling passage to adjust the temperature of the superheated steam.

[0014] The boiler with a packaged heat exchanger further includes a bypass passage which bypasses some of the air supplied by the damper to supply the air to the burner.

[0015] In addition, the boiler with a packaged heat exchanger further includes a blower capable of rotational speed control by an inverter to control the total volume of the air supplied to the damper.

[0016] As described above, according to the present invention, the boiler with a packaged heat exchanger for superheated steam control has the heat exchanger, in which the heating passage and the cooling passage are packaged, to generate superheated steam through heat exchange by exhaust gas and adjust the temperature of the superheated steam to a suitable level for the use through heat exchange with air, thereby controlling superheated steam.

[0017] Moreover, the boiler with a packaged heat exchanger for superheated steam supplies preheated air, heated while passing through the cooling passage, as combustion air, and if necessary, and bypasses additional combustion air through an air control by the damper and supplies the combustion air to the burner, thereby enhancing combustion efficiency.

[0018] In addition, the boiler with a packaged heat exchanger for superheated steam can supply superheated steam at an appropriate temperature for the usage place via the packaged heat exchanger without condensate formation, and can increase the heat recovery rate of exhaust gases of the boiler by using the preheated air for boiler combustion after heat exchange.BRIEF DESCRIPTION OF THE DRAWINGS

[0019] FIG. 1 is a perspective view of a boiler with a packaged heat exchanger for superheated steam according to the present invention.

[0020] FIG. 2 is a perspective view of the packaged heat exchanger in the boiler according to the present invention.

[0021] FIG. 3 is a front view of the packaged heat exchanger in the boiler according to the present invention.DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0022] Hereinafter, to describe operational advantages and objectives achieved by the implementation of the present invention, preferred embodiments of the present invention will be described.

[0023] Firstly, it will be understood that the words or terms used in the present invention are used to describe specific embodiments of the present invention and there is no intent to limit the present invention. The singular form of the components may be understood into the plural form unless otherwise specifically stated in the context. It should be also understood that the terms of ‘include’ or ‘have’ in the specification are used to mean that there are characteristics, numbers, steps, operations, components, parts, or combinations of the steps, operations, components and parts described in the specification and there is no intent to exclude existence or possibility of other characteristics, numbers, steps, operations, components, parts, or combinations of the steps, operations, components and parts.

[0024] In describing the present invention, detailed description of relevant known configuration or function will be omitted if it is determined that such description may make the substance of the present invention unclear.

[0025] As illustrated in FIGS. 1 to 3, a boiler with a packaged heat exchanger for superheated steam according to the present invention includes a boiler body 10, a burner 20, a heat exchanger 30, a diaphragm 40, a heating passage 50, and a cooling passage 60.

[0026] As illustrated in FIG. 1, the boiler body 10 according to the present invention includes a combustion chamber, and the burner 20 is mounted on the boiler body 10 to supply a flame to the combustion chamber by burning fuel.

[0027] Additionally, a blower 80 for supplying combustion air to the burner 20 may be positioned on one side of the boiler body 10.

[0028] As illustrated in FIGS. 1 to 3, the heat exchanger 30 according to the present invention is configured to discharge saturated steam, which is supplied from the boiler body 10, as superheated steam through heat exchange.

[0029] The heat exchanger 30 can be positioned at the front of the boiler body 10.

[0030] That is, the heat exchanger 30 may include a heat exchange case 31, and a heat transfer pipe 33 formed inside the heat exchange case 31. In this case, a saturated steam supply header 35 is equipped at an inlet of the heat transfer pipe 33 to introduce the saturated steam supplied from the boiler body 10 into the heat transfer pipe 33, and a superheated steam outlet header 37 is equipped at an outlet of the heat transfer pipe 33 to discharge the superheated steam resulting from the heat exchange.

[0031] That is, the saturated steam supplied from the boiler body 10 is supplied into the saturated steam supply header 35 through a supply pipe 11, and enters the heat transfer pipe 33. Thereafter, the saturated steam is superheated through heat exchange while passing through the heat transfer pipe 33, and then, is discharged through the superheated steam outlet header 37.

[0032] As described above, the superheated steam heated through the heat exchanger 30 can be supplied to a usage place. In this case, it is necessary to supply the superheated steam at a temperature suitable for the application.

[0033] Traditionally, water is sprayed into the heat transfer pipe 33 to control the temperature of the superheated steam. However, such a traditional method requires significant costs and is unsuitable for adjusting the temperature of the superheated steam to a desired level with a fine difference.

[0034] So, To overcome the issues, the present invention intends to adjust the temperature of the superheated steam to a suitable level for the usage place by utilizing air supplied by a blower 80.

[0035] Hereinafter, a configuration for adjustment of superheated steam temperature by air will be described.

[0036] As illustrated in FIGS. 1 to 3, the diaphragm 40 according to the present invention is configured to divide the heat exchanger 30 into a cooling space and a heating space.

[0037] That is, the diaphragm 40 divides the interior space of the heat exchange case 31 to form a heating passage 50 on one side, i.e., on the right side of diaphragm 40 as illustrated in FIG. 3, and a cooling passage 60 on the other side, i.e., on the left side of diaphragm 40 as illustrated in FIG. 3.

[0038] In this case, the heat transfer pipe 33 of the heat exchanger 30 may include a saturated steam heat transfer pipe 33a positioned above the heating passage 50, and a preheated air heat transfer pipe 33b positioned above the cooling passage 60.

[0039] As described above, a flow passage is divided into the heating passage 50 and the cooling passage 60 by the diaphragm 40, and the heat exchange action of the packaged heat exchanger 30 can be performed as follows.

[0040] Firstly, exhaust gases emitted from the boiler body 10 after combustion are introduced into the heating passage 50, so that superheated steam may be generated through heat exchange between the saturated steam passing through the heating passage 50 and the exhaust gases.

[0041] Next, the saturated steam passing through the heating passage 50 can be discharged as superheated steam of a heated state. In this case, to provide steam at a temperature suitable for use, air can be introduced into the cooling passage 60 by a blower 80. Therefore, the steam passing through the saturated steam heat transfer pipe 33a located in the heating passage 50 can be cooled by passing through the preheated air heat transfer pipe 33b situated in the cooling passage 60.

[0042] The superheated steam generated through the heat exchange can be adjusted to a temperature suitable for the usage place to be supplied. However, if the usage place requires steam in a superheated state, the air supplied to the cooling passage 60 can be blocked, and it can be implemented by a damper described later.

[0043] Particularly, during the heat exchange process, the air supplied to the cooling passage 60 can be heated through heat exchange while passing through the preheated air heat transfer pipe 33b to be preheated to a predetermined temperature. The preheated air can be supplied to the burner 20 for use as combustion air. For this purpose, a connection path 21 may be equipped to allow communication with the burner 20 below the cooling passage 60.

[0044] In this case, an exhaust gas inlet 51 may be positioned below the heating passage 50, and an exhaust gas outlet 53, through which the exhaust gases are discharged after heat exchange, may be located above the heating passage 50. The exhaust gas inlet 51 is the high-temperature side where exhaust gases enter, and the exhaust gas outlet 53 is the low-temperature side where the temperature-reduced exhaust gases are discharged.

[0045] Moreover, the cooling passage 60 may have an air inlet 61 positioned at the top to introduce air and an air outlet 63 at the bottom to discharge the air. The air discharged through the air outlet 63 is in a preheated state, and the preheated air can be supplied to the burner 20 through the connection path 21.

[0046] Meanwhile, a damper 70 may be further equipped to control the volume and direction of air supplied through an air passage according to the present invention.

[0047] The damper 70 according to the present invention can be positioned above the air passage and connected through the blower 80 and a duct 81. Thus, the damper 70 can regulate the volume of air supplied from the blower 80 and supply the air into the cooling passage 60.

[0048] The damper 70 is provided to control the volume of air supplied to the cooling passage 60. Furthermore, a bypass passage 90, which is connected to the connection path 21 of the burner 20 through an outlet 93 thereof, is further provided to supply additional air needed for combustion to the burner 20 by bypassing some of the air supplied from the blower 80.

[0049] The damper 70 includes a first supply part 71 connected to the inlet of the cooling passage 60, and a second supply part 73 connected to an inlet 91 of the bypass passage 90 positioned on one side of the cooling passage 60. In this case, the first supply part 71 includes a first adjustment member 71a for adjusting the opening level, and the second supply part 73 includes a second adjustment member 73a for adjusting the opening level.

[0050] Therefore, the air supplied from the blower 80 moves through the duct, and adjusts the volume of air supplied to the cooling passage 60 and / or the bypass passage 90 according to the opening level of the first and second adjustment members 71a and 73a.

[0051] Additionally, when the second adjustment member 73a is closed, the air supplied from the blower 80 is supplied into the cooling passage 60. In this case, the volume of air supplied into the cooling passage 60 can be adjusted by the opening level of the first adjustment member 71a.

[0052] Conversely, when the first adjustment member 71a is closed, the air supplied from the blower 80 is supplied into the bypass passage 90. In this case, the volume of air supplied into the bypass passage 90 can be adjusted by the opening level of the second adjustment member 73a.

[0053] In addition, the total volume control of the air supplied to the damper 70 according to the present invention can be achieved by controlling the rotational speed of the blower 80 through an inverter equipped on the blower 80.

[0054] As described above, the boiler according to the present invention includes the heat exchanger 30 where the heating passage 50 and the cooling passage 60 are packaged to generate superheated steam through heat exchange with exhaust gases and to adjust the temperature of the superheated steam through heat exchange with the air, thereby adjusting the temperature of the superheated steam to a suitable level for a usage place. Additionally, the preheated air heat-exchanged while passing through the cooling passage 60 can be supplied to the burner 20 as combustion air.

[0055] As described above, while the present invention has been described with reference to the embodiments illustrated in the drawings, it will be apparent to those skilled in the art that various modifications can be made to the above-described exemplary embodiments of the present disclosure without departing from the spirit or scope of the invention.

Examples

Embodiment Construction

[0022]Hereinafter, to describe operational advantages and objectives achieved by the implementation of the present invention, preferred embodiments of the present invention will be described.

[0023]Firstly, it will be understood that the words or terms used in the present invention are used to describe specific embodiments of the present invention and there is no intent to limit the present invention. The singular form of the components may be understood into the plural form unless otherwise specifically stated in the context. It should be also understood that the terms of ‘include’ or ‘have’ in the specification are used to mean that there are characteristics, numbers, steps, operations, components, parts, or combinations of the steps, operations, components and parts described in the specification and there is no intent to exclude existence or possibility of other characteristics, numbers, steps, operations, components, parts, or combinations of the steps, operations, components an...

Claims

1. A boiler comprising:a boiler body having a combustion chamber;a burner for supplying flames to the combustion chamber of the boiler body;a heat exchanger for discharging superheated steam through heat exchange with saturated steam supplied from the boiler body;a diaphragm for dividing the heat exchanger;a heating passage arranged on one side of the diaphragm to generate superheated steam through heat exchange between the saturated steam of the heat exchanger and exhaust gases from the combustion chamber; anda cooling passage arranged on the other side of the diaphragm to lower the temperature of the superheated steam generated by the heating passage through heat exchange with air.

2. The boiler according to claim 1, wherein the air preheated through heat exchange with the heat exchanger while passing through the cooling passage is supplied to the burner for using the air as combustion air.

3. The boiler according to claim 2, further comprising:a damper for controlling the volume of air supplied to the cooling passage to adjust the temperature of the superheated steam.

4. The boiler according to claim 3, further comprising:a bypass passage which bypasses some of the air supplied by the damper to supply the air to the burner.

5. The boiler according to claim 4, further comprisinga blower capable of rotational speed control by an inverter to control the total volume of the air supplied to the damper.

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