Flue gas waste heat recovery device of gas-fired boiler

Abstract

The utility model relates to the technical field of waste heat recovery, in particular to a gas boiler flue gas waste heat recovery device which comprises a gas furnace, a steam cavity and a burner. The combustor is installed at the bottom in the gas furnace, the steam cavity is arranged above the combustor, the upper portion of the combustor located around the steam cavity is communicated with a steam concentration channel of an inverted-funnel-shaped structure, the top of the steam concentration channel is communicated with a waste heat discharging channel, and a plurality of sets of heat transfer layers are arranged in the waste heat discharging channel from top to bottom at intervals. The heat transfer layer is connected with a heat conduction rod towards the outside of the waste heat discharging channel, the side wall of one side of the combustor outwards communicates with an air input pipeline, a section of the air input pipeline is wrapped with a heating sleeve, and the upper side wall of the heating sleeve is connected with the bottom end of the heat conduction rod. According to the device, sufficient oxygen is provided, and meanwhile, the temperature of other gases in the air can be increased, so that the influence on the combustion temperature of the gases in the combustor is reduced, namely, flue gas waste heat is fully converted and utilized.

Description

TECHNICAL FIELD

[0001] The utility model relates to a waste heat recovery technical field, concretely is gas -fired boiler flue gas waste heat recovery device. BACKGROUND

[0002] Gas-fired boiler is a kind of using natural gas or liquefied petroleum gas (LPG) as fuel, produces heat energy by burning, and further heats water or produces steam equipment.Gas-fired boiler is widely used in household heating, industrial production, commercial building and other fields.

[0003] Gas-fired boiler is in the process of using, adopts natural gas, oil gas to burn, burning naturally needs to use oxygen, generally for gas-fired boiler will set up air input pipeline, for keeping the full combustion of the dye inside the boiler, but when inputting air, it is simple to directly input external air, air temperature has greater difference compared with the combustion temperature in the boiler, will reduce the combustion efficiency in the boiler to a certain extent;

[0004] Therefore, in view of the above problems, the technical scheme provides a gas-fired boiler flue gas waste heat recovery device. UTILITY MODEL CONTENTS

[0005] The utility model discloses a gas-fired boiler flue gas waste heat recovery device to solve the problems in the above background.

[0006] In order to realize the above object, the utility model provides the following technical scheme: gas boiler flue gas waste heat recovery device, including gas furnace, steam cavity, combustor, combustor installation setting in the bottom of gas furnace, steam cavity sets up above combustor, through the water injection to steam cavity, then drive combustor carries out combustion to it, steam cavity top has the steam export that communicates, through the hot steam export, to this carries out transformation and utilization, combustor top that is located steam cavity surrounds has the steam concentration channel that shows inverted funnel type structure and communicates, steam concentration channel transmission is carried out to the flue gas that combustor produces, steam concentration channel top has the waste heat discharge channel that communicates, flue gas is along the waste heat discharge channel and exports, simultaneously in the waste heat discharge channel inside from top to bottom interval type sets up multiple heat transfer layer, flowing flue gas absorbs part of heat when passing through gas furnace inside, heat transfer layer is connected with the heat conduction rod towards the waste heat discharge channel outside, combustor one side wall has the air input pipeline that communicates outward, through air input pipeline input outside air to combustor, is used for maintaining its inside dye carries out sufficient combustion, air input pipeline outside is provided with a section and is wrapped with heating jacket, heating jacket upper side wall is connected with heat conduction rod bottom end, the waste heat in the flue gas that heat transfer layer absorbs, under the transmission of heat conduction rod, shifts to heating jacket, then through heating jacket heating air that flows in air input pipeline inside, so that improve its temperature that is input to combustor, namely guarantee provides sufficient oxygen, also can temperature of other gas in air is promoted, thereby reduces the influence to gas combustion temperature in combustor, namely sufficient transformation and utilization of flue gas waste heat.

[0007] Compared with the prior art, the utility model has the advantages that: through setting multiple heat transfer layers in the waste heat discharge channel, using the heat transfer ring in the heat transfer layer, heat conduction connecting rod cooperates with the external heat conduction rod, the waste heat in the flue gas is absorbed and transferred, then is transferred to the heating plate layer outside the air input pipeline, then the air entering the combustor is heated by the heating plate layer, the temperature is improved, the influence on the fuel combustion in the combustor is reduced, and the effective utilization of the waste heat in the flue gas is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0008] Figure 1 It is the main view inside structure schematic diagram of gas boiler flue gas waste heat recovery device.

[0009] Figure 2 It is the structure schematic diagram of heat transfer layer in gas boiler flue gas waste heat recovery device.

[0010] Figure 3 It is Figure 1 The enlarged structure schematic diagram of A in the middle.

[0011] Figure 4 It is Figure 1 The enlarged structure schematic diagram of B in the middle.

[0012] Wherein: gas furnace 10, steam cavity 11, steam concentration channel 12, waste heat discharge channel 13, air input pipeline 14, burner 15, heat conduction rod 16, heat insulation sleeve 17, heating sleeve 18, heating plate layer 19, heat transfer layer 20, mounting plate 21, heat insulation ring 22, heat transfer ring 23, fixed rod 24, heat conduction connecting rod 25, heat insulation base plate 26. DETAILED DESCRIPTION

[0013] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0014] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features with "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified and limited, the terms "mounting", "connecting", "connection" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0015] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connecting", "connection" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0016] The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0017] Please refer to Figures 1-4The gas boiler flue gas waste heat recovery device, including gas stove 10, steam cavity 11, burner 15, burner 15 is installed and arranged in the bottom of gas stove 10, steam cavity 11 is arranged above burner 15, by injecting water towards steam cavity 11, then drive burner 15 to carry out combustion, steam cavity 11 is connected with steam outlet above, by the hot steam is discharged outward, to this for conversion and utilization, the burner 15 above steam cavity 11 is connected with steam concentration channel 12 of inverted funnel type structure around steam cavity 11, steam concentration channel 12 is transmitted to the flue gas generated in burner 15, steam concentration channel 12 top is connected with waste heat discharge channel 13, flue gas is discharged outward along waste heat discharge channel 13, while multiple groups of heat transfer layers 20 are arranged in waste heat discharge channel 13 from top to bottom, part of heat is absorbed when flowing flue gas passes through the inside of gas stove 10, heat transfer layer 20 is connected with heat conduction rod 16 towards the outside of waste heat discharge channel 13, air input pipeline 14 is connected with the outside of the sidewall of burner 15, outside air is input into burner 15 through air input pipeline 14, for keeping the dye inside it to burn fully, a section of heating jacket 18 is wrapped outside air input pipeline 14, heating jacket 18 upper sidewall is connected with the bottom end of heat conduction rod 16, the waste heat in the flue gas adsorbed in heat transfer layer 20 is transferred to heating jacket 18 under the transmission of heat conduction rod 16, then the air flowing in air input pipeline 14 is heated through heating jacket 18, so as to improve the temperature of its input into burner 15, that is, sufficient oxygen is ensured, and the temperature of other gases in air can be improved, so as to reduce the influence on gas combustion temperature in burner 15, that is, the flue gas waste heat is fully converted and utilized.

[0018] In the embodiment of the application, a plurality of support columns are uniformly installed at the bottom of the gas stove 10 for controlling the stability of the gas stove 10, and a heat insulation sleeve 17 is wrapped outside the heat conduction rod 16 for reducing the loss of heat transmission in the heat conduction rod 16.

[0019] Meanwhile, a heating plate layer 19 is arranged on the side of the inner side of the heating jacket 18 in contact with the outer sidewall of the air input pipeline 14, and the heating plate layer 19 has extremely high thermal conductivity, and the air input pipeline 14 pipe wall inside the heating plate layer 19 is also arranged in a heat-conducting structure, that is, the heat energy in the heat conduction rod 16 is fully transmitted to the air input pipeline 14, and the gas flowing in the air input pipeline 14 is heated.

[0020] In one example of the present application, the heat transfer layer 20 includes a heat insulation base plate 26 fixed on the inner wall of the waste heat discharge channel 13, a group of heat insulation rings 22 fixedly installed between the heat insulation base plates 26 through a mounting plate 21, flue gas flowing in the waste heat discharge channel 13 flows upwards along the inside of the heat insulation rings 22, a group of heat transfer rings 23 are fixedly installed on the inside of the heat insulation rings 22 through a fixed rod 24, one side of the heat transfer rings 23 facing the heat conduction rod 16 is connected with a group of heat conduction connecting rods 25 movably passing through the heat insulation rings 22 and the waste heat discharge channel 13, the heat in the flue gas passing through the heat transfer rings 23 is partially absorbed into the heat transfer rings 23 and then transferred outwardly through the heat conduction connecting rods 25, the end of the heat conduction connecting rods 25 is connected with the top end of the heat conduction rod 16, so as to transfer the waste heat in the flue gas in the waste heat discharge channel 13 to the air input pipeline 14 for utilization.

[0021] Specifically, the heat conduction connecting rods 25 have the same structure as the heat conduction rod 16 and can stably transfer the heat energy in the heat transfer rings 23.

[0022] The working principle of the present application is as follows: all the driving elements, i.e. power elements, electrical devices and the corresponding power supply are connected through wires at the idle place of the device, the electrical devices are sequentially connected in electrical connection, the detailed connection means is a known technology in the field, the working principle and process are mainly introduced below, and the electrical control is not described, when running, the flue gas generated by the combustion in the burner 15 flows upwards along the surrounding and enters the waste heat discharge channel 13 through the steam concentration channel 12, then passes through the heat transfer rings 23 on the inside of the heat insulation rings 22, the heat transfer rings 23 absorb the heat in the flue gas, then the heat is transferred to the heating jacket 18 through the heat conduction connecting rods 25 and the heat conduction rod 16, and then the air flowing in the air input pipeline 14 is heated through the heating plate layer 19, so that the air has a certain temperature and is transferred to the burner 15, thereby reducing the influence of the fuel combustion temperature in the burner 15 and improving the utilization of the waste heat in the flue gas.

[0023] The preferred embodiments of the present application are described in detail above, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the purpose of the present application.

Claims

1. A gas boiler flue gas heat recovery device, characterized in that, Including gas stove (10), steam cavity (11), burner (15); The burner (15) is arranged on the bottom of the gas stove (10), the steam cavity (11) is arranged above the burner (15), the steam cavity (11) is communicated with steam outlet above, the steam concentrated passage (12) in inverted funnel type structure is communicated above the burner (15) around the steam cavity (11), the top of the steam concentrated passage (12) is communicated with the waste heat discharge passage (13), a plurality of groups of heat transfer layers (20) are arranged in the waste heat discharge passage (13) from top to bottom at intervals, the heat transfer layer (20) is connected with the heat conducting rod (16) outside the waste heat discharge passage (13), the air input pipeline (14) is communicated outside the sidewall of one side of the burner (15), a section of the heating jacket (18) is arranged outside the air input pipeline (14), and the sidewall of the heating jacket (18) is connected with the bottom end of the heat conducting rod (16).

2. The gas boiler flue gas heat recovery device according to claim 1, characterized in that, The bottom of the gas stove (10) is uniformly provided with a plurality of supporting columns, and the outer side of the heat conducting rod (16) is wrapped with a heat insulation sleeve (17).

3. The gas boiler flue gas heat recovery device according to claim 2, characterized in that, One side of the air input pipeline (14) in contact with the outer sidewall of the heating jacket (18) is provided with a layer of heating plate layer (19), and the heating plate layer (19) has extremely high thermal conductivity, and the air input pipeline (14) pipe wall inside the heating plate layer (19) is also provided with a heat conducting structure.

4. The gas boiler flue gas heat recovery device according to claim 3, characterized in that, The heat transfer layer (20) includes a heat insulation base plate (26) fixed on the inner wall of the waste heat discharge passage (13), a group of heat insulation rings (22) are fixedly installed on the heat insulation base plate (26) through an installation plate (21), flue gas flowing in the waste heat discharge passage (13) flows upwards along the inside of the heat insulation ring (22), a group of heat transfer rings (23) are fixedly installed on the inside of the heat insulation ring (22) through a fixed rod (24), and the heat transfer ring (23) is connected with a group of heat conducting connecting rods (25) that pass through the heat insulation ring (22) and the waste heat discharge passage (13) on the side of the heat conducting rod (16).

5. The gas boiler flue gas heat recovery device according to claim 4, characterized in that, The heat conducting connecting rod (25) has the same structure as the heat conducting rod (16).

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