Gas-fired boiler with waste heat recovery function

Abstract

The utility model particularly relates to a gas-fired boiler with a waste heat recovery function, which comprises a gas-fired boiler, a gas inlet pipe connected below the gas-fired boiler, an exhaust pipe I connected above the gas-fired boiler, a waste heat recovery box connected at the rear end of the exhaust pipe I, the exhaust pipe I positioned at the lower part of the waste heat recovery box, and an exhaust pipe II connected at the upper end of the waste heat recovery box, gas entering the waste heat recovery box from the first exhaust pipe is exhausted through a second exhaust pipe, the upper end of the waste heat recovery box is connected with a first gas inlet branch pipe, the lower end of the waste heat recovery box is provided with a second gas inlet branch pipe, gas entering the waste heat recovery box from the first gas inlet branch pipe is exhausted through the second gas inlet branch pipe, and the lower end of the second gas inlet branch pipe is connected with the gas inlet pipe. According to the gas-fired boiler waste heat recycling device, waste heat of a gas-fired boiler can be recycled and reutilized, meanwhile, smoke dust in gas can be settled and filtered in a multi-stage and multi-layer mode when combusted gas is treated, so that the cleanliness degree of final emission of the gas is increased, and a large amount of smoke dust is prevented from entering air.

Description

Technical Field

[0001] The utility model belongs to the technical field of boiler waste heat recovery, and particularly relates to a gas boiler with waste heat recovery function. Background Art

[0002] In order to improve the air quality of cities, using clean energy has become a trend. With the continuous rise of energy prices, it is imperative to study energy-saving technologies for natural gas utilization, and the market prospect is broad.

[0003] Gas boilers include gas water boilers, gas hot water boilers, gas steam boilers, etc. Among them, gas hot water boilers are also called gas heating boilers and gas bathing boilers. As the name implies, gas boilers refer to boilers fueled by gas. Gas boilers are the most economical compared with oil-fired boilers and electric boilers. Therefore, most people choose gas boilers as boiler equipment for steam, heating, and bathing.

[0004] For example, a gas boiler capable of recovering waste heat with the patent number application number CN201520584427.0 discloses that "the boiler device includes a boiler, a main intake pipe, and an exhaust pipe, and also includes an auxiliary intake pipe connected to the main intake pipe. The auxiliary intake pipe is sequentially connected to a preheating device and a cooling device and then leads into a decontamination tank. The preheating device is also connected to the exhaust pipe and a gas-liquid separation device. The cooling device is connected with a water inlet pipe and a water outlet pipe, and a water pump is arranged on the water inlet pipe. The utility model passes the high-temperature gas discharged from the boiler through the preheating device and the cooling device in sequence, preheats the oxygen-rich air, and at the same time, the waste heat of the flue gas is exchanged with cold water, which can make full use of the heat of the flue gas. Finally, the flue gas leads into the decontamination tank to remove most of the harmful impurities and dust in the tail gas." Due to the fact that there will be soot and other situations after partial gas combustion (soot will be generated after the impurities in the gas are burned, etc.), although the above structure can realize the recovery of waste heat from the gas after boiler combustion, the waste heat recovery efficiency is relatively low. Furthermore, through a single preheating device, the heat of the gas is exchanged, and a large amount of heat energy cannot be recovered, and there will still be a large amount of heat dissipated. At the same time, only the decontamination tank in the middle is set to treat the tail gas, and the soot adsorption effect is limited, that is, the soot treatment effect is not good.

[0005] In order to solve the above problems, we provide a gas boiler with waste heat recovery function that can realize the recovery of waste heat from the gas boiler and facilitate multi-stage dust reduction treatment of soot. Summary of the Utility Model

[0006] The purpose of the utility model is to overcome the deficiencies existing in the prior art and provide a gas boiler with waste heat recovery function.

[0007] The purpose of the present utility model is achieved as follows: A gas boiler with waste heat recovery function, including a gas boiler, an intake pipe is connected below the gas boiler, an exhaust pipe 1 is connected above the gas boiler, the rear end of the exhaust pipe 1 is connected to a waste heat recovery box, the exhaust pipe 1 is located at the lower part of the waste heat recovery box, an exhaust pipe 2 is connected to the upper end of the waste heat recovery box, the gas entering the waste heat recovery box through the exhaust pipe 1 is discharged through the exhaust pipe 2, an intake branch pipe 1 is connected to the upper end of the waste heat recovery box, an intake branch pipe 2 is arranged at the lower end of the waste heat recovery box, the gas entering the waste heat recovery box through the intake branch pipe 1 is discharged through the intake branch pipe 2, and the lower end of the intake branch pipe 2 is connected to the intake pipe.

[0008] Further, a dust sedimentation mechanism is arranged at the bottom of the waste heat recovery box, and the dust sedimentation mechanism includes a sedimentation box. The right end of the sedimentation box is connected to the exhaust pipe 1, and the bottom of the sedimentation box is a detachable structure.

[0009] Further, a dust filtration mechanism is arranged in the waste heat recovery box. The dust filtration mechanism includes a filtration box. Multiple partition plates are arranged in the filtration box. The lower ends of the partition plates are not connected to the bottom of the filtration box. The filtration box is divided into multiple left and right spaces by the partition plates. A communication box is arranged on the right side of the filtration box. Multiple pipes are respectively arranged on each partition plate, and the multiple spaces in the filtration box are communicated through the pipes.

[0010] When the utility model is in use, gas is supplied into the gas boiler through the air inlet pipe. The gas discharged after the combustion of the gas boiler is discharged through the first exhaust pipe. The exhaust fan can be turned on for exhaust as needed. The gas passing through the first air inlet pipe enters the settling box of the dust settling mechanism. Since the space of the settling box is relatively large, the gas will flow slowly after entering, and a large amount of dust will naturally settle to the bottom in the settling box. The bottom of the settling box can be opened regularly as needed to clean the dust, and the first settlement of the dust is realized through the dust settling mechanism. Heat conduction will occur on the outer wall of the settling box, so the heat in the gas will be dissipated through the outside of the settling box. The gas passing through the dust settling mechanism then enters the dust filtering mechanism. The gas is introduced into the lower left part inside the filtering box through the first connecting pipe. Water is filled at the bottom of the filtering box. The gas discharged from the first connecting pipe rises through the water on the left side of the filtering box to the upper left part of the filtering box. After passing through the water, the dust in the gas is preliminarily adsorbed and filtered. When there is too much gas in the upper left part of the left side of the filtering box, the gas on the left side of the filtering box enters the space on the right side of the partition through the pipeline. After the gas enters the space area on the middle right side through the lower part of the pipeline, it is filtered again by the water in the space area on the right side. When there is too much gas in the middle space, the gas enters the space on the right side through the pipeline on the right side, that is, the gas is filtered again by the water under the right side space. The dust in the gas is filtered multiple times through the dust filtering mechanism, and then the dust in the gas is cleaned and filtered so as not to affect the heat dissipation function of the subsequent thinner pipeline. If there is a large amount of dust in the gas, it is very easy to cause blockage in the thinner pipeline, affecting heat dissipation and exhaust. At the same time, a guiding plate with an inclined upper surface is arranged at the bottom, which can guide the dust in the water to move into the connecting box on the right after precipitation. By opening the upper part of the connecting box, it is convenient to clean the dust accumulated at the bottom of the connecting box.

[0011] The gas passing through the dust filtering mechanism then enters the heat dissipation mechanism. The heat dissipation mechanism is composed of multiple interconnected branch pipes. After the gas enters the heat dissipation mechanism, the gas is quickly dissipated through the branch pipes. The dissipated gas is then discharged through the second exhaust pipe at the exhaust end of the heat dissipation mechanism.

[0012] External gas is supplied into the waste heat recovery box through the intake branch pipe. The external gas is heated by the heat dissipation mechanism in the waste heat recovery box. When the gas flows downward, it is further heated by the heat transfer of the outer walls of the filtering box and the settling box. The heated gas is supplied to the air inlet pipe through the second intake branch pipe. The blower one can be turned on as needed to drive the external gas to enter the waste heat recovery box through the first air inlet pipe. At the same time, the blower two can be turned on as needed to supplement external gas into the air inlet pipe to supply sufficient gas to the gas boiler for its normal operation. The external gas heated after waste heat recovery can effectively utilize the waste heat of the gas boiler when it enters the gas boiler again.

[0013] Beneficial effects: The present application can recover the waste heat of the gas boiler and reuse it. At the same time, when treating the combustion gas, it can achieve multi-stage and multi-level sedimentation filtration of the soot in the gas to increase the cleanliness of the finally emitted gas and prevent a large amount of soot from entering the air. Description of the Drawings

[0014] Figure 1 It is a schematic structural view of the utility model.

[0015] Figure 2 It is a schematic partial structural view of the utility model.

[0016] Figure 3 It is a schematic partial structural cross-sectional view of the utility model.

[0017] Figure 4 It is a schematic structural view of the soot sedimentation mechanism of the utility model.

[0018] Figure 5 It is a schematic structural view of the soot filtration mechanism of the utility model.

[0019] Description of the reference numerals:

[0020] 1. Gas boiler, 2. Intake pipe, 3. Blower II, 4. Intake branch pipe II, 5. Waste heat recovery box, 6. Blower I, 7. Intake branch pipe I, 8. Exhaust pipe II, 9. Soot sedimentation mechanism, 10. Exhaust pipe I, 11. Exhaust fan, 12. Heat dissipation mechanism, 13. Soot filtration mechanism, 1301. Filter box, 1302. Partition board, 1303. Pipe, 1304. Guide plate, 1305. Connecting box. Detailed Description of the Invention

[0021] Example 1, as Figure 1 —5 shows, the object of the present utility model is achieved as follows: A gas boiler with waste heat recovery function, including a gas boiler 1, which is a prior art and will not be described in technical details; an intake pipe 2 is connected below the gas boiler 1, an exhaust pipe I 10 is connected above the gas boiler 1, the rear end of the exhaust pipe I 10 is connected to a waste heat recovery box 5, the exhaust pipe I 10 is located at the lower part of the waste heat recovery box 5, an exhaust pipe II 8 is connected to the upper end of the waste heat recovery box 5, the gas entering the waste heat recovery box 5 through the exhaust pipe I 10 is discharged through the exhaust pipe II 8, an intake branch pipe I 7 is connected to the upper end of the waste heat recovery box 5, an intake branch pipe II 4 is arranged at the lower end of the waste heat recovery box 5, the gas entering the waste heat recovery box 5 through the intake branch pipe I 7 is discharged through the intake branch pipe II 4, and the lower end of the intake branch pipe II 4 is connected to the intake pipe 2.

[0022] A dust settling mechanism 9 is provided at the bottom of the waste heat recovery box 5. The dust settling mechanism 9 includes a settling box. The right end of the settling box is connected to the first exhaust pipe 10, and the bottom of the settling box is a detachable structure. A dust filtering mechanism 13 is provided inside the waste heat recovery box 5. The dust filtering mechanism 13 includes a filtering box 1301. A plurality of partition plates 1302 are provided inside the filtering box 1301. The lower ends of the partition plates 1302 are not connected to the bottom of the filtering box 1301. The inside of the filtering box 1301 is divided into a plurality of left and right spaces by the partition plates 1302. A connecting box 1305 is provided on the right side of the filtering box 1301. A plurality of pipes 1303 are respectively provided on each partition plate 1302, and the plurality of spaces inside the filtering box 1301 are communicated through the pipes 1303.

[0023] A guiding plate 1304 is provided at the bottom inside the filtering box 1301, and the upper surface of the guiding plate 1304 is an inclined surface structure. A first connecting pipe is provided at the lower left of the filtering box 1301, and the first connecting pipe is connected to the upper left of the dust settling mechanism 9. The lower ends of the pipes 1303 on the left partition plate 1302 are higher than the lower ends of the pipes 1303 on the right partition plate 1302.

[0024] A heat dissipation mechanism is provided above the dust filtering mechanism 13. The heat dissipation mechanism includes a plurality of branch pipes that are interconnected. The intake end of the heat dissipation mechanism is connected to the upper right of the dust filtering mechanism 13, and the exhaust end of the heat dissipation mechanism is connected to the second exhaust pipe 8. The lower end of the first intake branch pipe 7 is connected to the upper end of the waste heat recovery box 5, and the upper end of the second intake branch pipe 4 is connected to the lower end of the waste heat recovery box 5. A exhaust fan 11 is provided on the first exhaust pipe 10. A first blower 6 is provided on the first intake branch pipe 7, and a second blower 3 is provided on the intake pipe 2.

[0025] When the utility model is in use, gas is supplied into the gas boiler 1 through the air inlet pipe 2. The gas discharged after the combustion of the gas boiler 1 is discharged through the first exhaust pipe 10. The exhaust fan 11 can be turned on for exhaust as needed. The gas passing through the air inlet pipe 2 enters the settling box of the dust settling mechanism 9. Since the space of the settling box is large, the gas will flow slowly after entering, and a large amount of dust will settle naturally to the bottom of the settling box. The bottom of the settling box can be opened regularly as needed to clean the dust. The first settling of the dust is achieved through the dust settling mechanism 9. Heat conduction will occur on the outer wall of the settling box, so the heat in the gas will be dissipated through the outside of the settling box. The gas passing through the dust settling mechanism 9 then enters the dust filtering mechanism 13. The gas is introduced into the lower left part of the filtering box 1301 in the filtering box 13 through the first connecting pipe. Water is filled at the bottom of the filtering box 1301. The gas discharged from the first connecting pipe rises through the water on the left side of the filtering box 1301 to the upper left part of the filtering box 1301. After passing through the water, the dust in the gas is preliminarily adsorbed and filtered. When there is too much gas in the upper left part of the filtering box 1301, the gas on the left side of the filtering box 1301 enters the space on the right side of the partition plate 1302 through the pipe 1303. After the gas enters the space area in the middle and right through the lower part of the pipe 1303, it is filtered again by adsorbing dust through the water in the space area on the right side. When there is too much gas in the middle space, the gas enters the right space through the right pipe 1303 again, that is, the gas is filtered again by adsorbing through the water under the right space. The dust in the gas is filtered multiple times through the dust filtering mechanism 13, and then the dust in the gas is cleaned and filtered so as not to affect the heat dissipation function of the subsequent thinner pipe 1303. If there is a large amount of dust in the gas, it is very easy to cause blockage in the thinner pipe 1303, affecting heat dissipation and exhaust. At the same time, a guide plate 1304 with an inclined upper surface is arranged at the bottom, which can guide the dust in the water to move into the connecting box 1305 on the right side after precipitation. By opening the upper part of the connecting box, it is convenient to clean the dust accumulated at the bottom of the connecting box 1305.

[0026] The gas passing through the dust filtering mechanism 13 then enters the heat dissipation mechanism. The heat dissipation mechanism is composed of multiple interconnected branch pipes. After the gas enters the heat dissipation mechanism, the gas is quickly dissipated through the branch pipes. The dissipated gas is then discharged through the second exhaust pipe 8 at the exhaust end of the heat dissipation mechanism.

[0027] External gas is supplied into the waste heat recovery box 5 through the intake branch pipe 7. The external gas is heated by the heat dissipation mechanism in the waste heat recovery box 5. When the gas flows downward, it is further heated through the heat transfer of the outer walls of the filter box 1301 and the sedimentation box. The heated gas is supplied to the intake pipe 2 through the intake branch pipe 4. The blower 6 can be turned on as needed to drive the external gas into the waste heat recovery box 5 through the intake pipe 2. At the same time, the blower 3 can be turned on as needed to supplement the external gas into the intake pipe 2 to supply sufficient gas to the gas boiler 1 for its normal operation. The external gas heated after waste heat recovery can effectively utilize the waste heat of the gas boiler 1 when it enters the gas boiler 1 again.

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0029] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A gas boiler with waste heat recovery function, including a gas boiler, characterized in that: An air intake pipe is connected to the bottom of the gas boiler, an exhaust pipe 1 is connected to the top of the gas boiler, a waste heat recovery box is connected to the rear end of the exhaust pipe 1, the exhaust pipe 1 is located at the bottom of the waste heat recovery box, the upper end of the waste heat recovery box is connected to the exhaust pipe 2, the gas entering the waste heat recovery box through the exhaust pipe 1 is discharged through the exhaust pipe 2, the upper end of the waste heat recovery box is connected to an air intake branch pipe 1, and the lower end of the waste heat recovery box is provided with an air intake branch pipe 2, the gas entering the waste heat recovery box through the air intake branch pipe 1 is discharged through the air intake branch pipe 2, and the lower end of the air intake branch pipe 2 is connected to the air intake pipe.

2. The gas boiler with waste heat recovery function according to claim 1, characterized in that: A smoke dust settling mechanism is arranged at the bottom of the waste heat recovery box. The smoke dust settling mechanism comprises a settling box. The right end of the settling box is connected to an exhaust pipe, and the bottom of the settling box is a detachable structure.

3. The gas boiler with waste heat recovery function according to claim 2 is characterized in that: The waste heat recovery box is provided with a smoke and dust filtering mechanism, which includes a filter box. The filter box is provided with multiple layers of partitions. The lower ends of the partitions are not connected to the bottom of the filter box. The filter box is divided into multiple spaces on the left and right by the partitions. A connecting box is provided on the right side of the filter box. Multiple pipes are respectively provided on each partition, and the multiple spaces in the filter box are connected through the pipes.

4. The gas boiler with waste heat recovery function according to claim 3 is characterized in that: A guide plate is arranged at the bottom of the filter box, and the upper surface of the guide plate is a slope structure.

5. The gas boiler with waste heat recovery function according to claim 4 is characterized in that: A connecting pipe 1 is arranged at the lower left part of the filter box, and the connecting pipe 1 is connected to the upper left part of the smoke and dust settling mechanism.

6. The gas boiler with waste heat recovery function according to claim 5, characterized in that: The lower end of the pipeline on the left partition is higher than the lower end of the pipeline on the right partition.

7. The gas boiler with waste heat recovery function according to claim 3 or 6, characterized in that: A heat dissipation mechanism is arranged above the smoke and dust filtering mechanism, and the heat dissipation mechanism includes a plurality of branch pipes, which are interconnected, the air inlet end of the heat dissipation mechanism is connected to the upper right side of the smoke and dust filtering mechanism, and the exhaust end of the heat dissipation mechanism is connected to the second exhaust pipe.

8. The gas boiler with waste heat recovery function according to claim 7, characterized in that: A lower end of the air intake branch pipe is connected to the upper end of the waste heat recovery box, and an upper end of the second air intake branch pipe is connected to the lower end of the waste heat recovery box.

9. The gas boiler with waste heat recovery function according to claim 8, characterized in that: An exhaust fan is arranged on the exhaust pipe.

10. The gas boiler with waste heat recovery function according to claim 9, characterized in that: The first intake branch pipe is provided with a first blower, and the second blower is provided on the intake pipe.

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