Condensation type energy saver based on heat balance of gas-fired boiler

Abstract

The utility model discloses a condensation type energy saver based on heat balance of a gas-fired boiler. The condensation type energy saver comprises a condensation type energy saver body and a smoke filtering channel. The smoke filtering channel communicates with one end of the condensation type energy saver through a communicating pipe, a smoke conveying main pipeline is arranged at the input end in the smoke filtering channel, the output end of the smoke conveying main pipeline communicates with two sets of smoke conveying branch pipelines in a control mode, and smoke flow direction control assemblies are arranged at the communicating positions of the smoke conveying branch pipelines and the smoke conveying main pipeline. A communicating opening is formed in an output opening of the smoke conveying branch pipeline, an elastic filtering assembly is arranged in the smoke conveying branch pipeline, a lifting type opening and closing assembly is arranged at the communicating opening, and the lifting type opening and closing assembly and the elastic filtering assembly are movably arranged. The energy saver automatically adjusts the flow direction of the flue gas, and meanwhile, long-time high-quality transmission of the flue gas is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to technical field, and specifically is a kind of condensing energy saver based on gas boiler heat balance. BACKGROUND

[0002] As a widely used heat energy equipment, the improvement of the thermal efficiency of gas boiler is of great significance to energy saving and emission reduction. However, in the operation process of traditional gas boiler, the exhaust gas temperature is high, and the water vapor in the flue gas is not fully utilized, resulting in a large amount of waste heat and an increase in the emission of carbon dioxide and nitrogen oxides. In order to solve this problem, the condensing energy saver emerges as the times require. The condensing energy saver recovers the waste heat in the exhaust gas of the gas boiler, condenses the water vapor in the flue gas into liquid water using condensation technology, releases latent heat, and thus improves the thermal efficiency of the boiler. The condensing energy saver not only significantly improves the thermal efficiency of the gas boiler, but also reduces the emission of carbon dioxide and nitrogen oxides, and has good energy saving and environmental protection effect.

[0003] The heat balance of the gas boiler refers to the balance between the input heat and the output heat of the boiler under stable working conditions. The heat balance analysis of the gas boiler is the basis for studying the thermal efficiency and energy loss of the boiler. The heat balance equation of the gas boiler can be expressed as:

[0004] Q_in = Q_out + Q_loss

[0005] Where Q_in is the input heat, Q_out is the output heat, and Q_loss is the energy loss. The input heat mainly includes the heat generated by gas combustion and the heat brought in by air; the output heat mainly includes the heat taken away by steam or hot water and the heat dissipated by the boiler; the energy loss mainly includes the exhaust gas loss, incomplete combustion loss and heat dissipation loss.

[0006] In the heat balance of the gas boiler, the exhaust gas loss is the largest energy loss item. The exhaust gas loss mainly consists of the heat taken away by the flue gas and the latent heat loss caused by the insufficient utilization of water vapor in the flue gas. The heat taken away by the flue gas is related to the exhaust gas temperature and the flue gas volume, and the higher the exhaust gas temperature and the larger the flue gas volume, the greater the exhaust gas loss. The latent heat loss caused by the insufficient utilization of water vapor in the flue gas is related to the water vapor content and the condensation temperature in the flue gas, and the higher the water vapor content and the lower the condensation temperature, the greater the latent heat loss

[0007] The working principle of the condensing energy saver is based on the physical phenomenon that water vapor in the flue gas condenses into liquid water at low temperature and releases latent heat. The condensing energy saver lowers the temperature of the flue gas to condense the water vapor in the flue gas into liquid water and release latent heat, thereby recovering the waste heat in the flue gas and improving the thermal efficiency of the boiler.

[0008] The working process of the condensing energy saver can be divided into the following steps:

[0009] Flue gas enters the condensing heat exchanger: The high-temperature flue gas discharged from the gas boiler enters the condensing heat exchanger through the flue gas passage.

[0010] Heat exchange between flue gas and cooling medium: In a condensing heat exchanger, flue gas exchanges heat with a cooling medium (such as water or air), and the flue gas temperature gradually decreases.

[0011] Water vapor condensation: When the flue gas temperature drops below the dew point temperature, the water vapor in the flue gas begins to condense into liquid water, releasing latent heat.

[0012] Condensate collection: Condensate that condenses into liquid water is collected through a condensate collection system and discharged from the system.

[0013] Heating with cooling medium: The cooling medium absorbs heat from the flue gas in the condenser heat exchanger, and its temperature rises, which can be used to heat boiler feedwater or for other purposes.

[0014] Through the above-described process, the condensing economizer can effectively recover waste heat from the flue gas, improve the boiler's thermal efficiency, and reduce emissions of carbon dioxide and nitrogen oxides, resulting in significant energy-saving and environmental protection effects.

[0015] Since the flue gas is discharged directly from the boiler, it contains a large amount of heat and some impurities. Therefore, while recovering and utilizing the waste heat, it is also necessary to filter and remove impurities. The common method is to filter it directly through a filter plate. However, since the flue gas is discharged and used to transfer waste heat, the operation time is relatively long each time. After a certain period of filtration, the impurities on the filter screen will gradually increase, and it is inconvenient to stop the gas flow to clean it.

[0016] Therefore, in view of the above-mentioned problems, this technical solution proposes a condensing energy saver based on the thermal balance of a gas-fired boiler. Utility Model Content

[0017] The purpose of this invention is to provide a condensing energy-saving device based on the thermal balance of a gas-fired boiler, so as to solve the problems mentioned in the background art.

[0018] To achieve the above objectives, this utility model provides the following technical solution:

[0019] A condensing economizer based on the thermal balance of a gas-fired boiler includes a condensing economizer and a flue gas filter channel. The flue gas filter channel is connected to one end of the condensing economizer via a connecting pipe. Flue gas generated in the gas-fired boiler is input into the condensing economizer through the flue gas filter channel. A main flue gas transmission pipe is installed at the input end of the flue gas filter channel. Two sets of flue gas transmission branch pipes are controllably connected to the output end of the main flue gas transmission pipe. A flue gas flow direction control component is installed at the connection point between the flue gas transmission branch pipes and the main flue gas transmission pipes for automated control of the flue gas input from the main flue gas transmission pipe into one of the flue gas transmission branch pipes. A connecting port is provided at the output end of the flue gas transmission branch pipes. An elastic filter component is installed inside the flue gas transmission branch pipes. The flue gas entering through the connection port is filtered by the elastic filter assembly, and then transferred to the connecting pipe along the rear end of the flue gas transmission branch pipe, and finally input into the condensing energy-saving device. A lifting opening and closing assembly is installed at the connection port. The lifting opening and closing assembly and the elastic filter assembly are movable. As the impurities on the elastic filter assembly increase, it moves gradually under the thrust of the flue gas, and then synchronously drives the lifting opening and closing assembly to control the connection port to close. After the connection port is completely closed, the flue gas flow direction assembly is activated to change the flue gas flow direction to another set of flue gas transmission branch pipes. At this time, the elastic filter assembly with a large amount of impurities is cleaned, and it does not affect the normal filtration and transmission of flue gas in the main flue gas transmission pipe to the condensing energy-saving device.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows: By setting a main flue gas transmission pipe and two branch flue gas transmission pipes connected to the main flue gas transmission pipe inside the flue gas filtration channel, and then connecting an accelerated filtration channel at the inner end of the branch flue gas transmission pipe, the flue gas passing through the accelerated filtration channel is automatically filtered by the filter plate inside the accelerated filtration channel, and then transferred to the condenser energy-saving device through the connecting pipe. At the same time, a swinging flue gas flow direction control plate is set at the connection between the main flue gas transmission pipe and the branch flue gas transmission pipe, which works in conjunction with the flue gas driven movement of the filter plate and the lifting and lowering movement of the baffle. While not affecting the normal flow of flue gas in the flue gas filtration channel, the flow direction of the flue gas can be automatically controlled, which facilitates the disassembly and cleaning of the filter plate 18, thus maintaining long-term accurate filtration of the flue gas flow. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the connection structure between a condensing energy saver based on the thermal balance of a gas-fired boiler and a flue gas filtration channel.

[0022] Figure 2 for Figure 1 A magnified structural diagram of A in the diagram.

[0023] Figure 3 for Figure 1 A magnified structural diagram of B in the diagram.

[0024] Figure 4 This is a schematic diagram of the filter plate in a condensing energy saver based on the thermal balance of a gas-fired boiler.

[0025] Among them: condensing energy saver 10, flue gas filter channel 11, flue gas transmission main pipe 12, flue gas transmission branch pipe 13, connecting pipe 14, connecting port 15, accelerating filtration channel 16, flue gas flow direction control plate 17, filter plate 18, slider 19, slide groove 20, buffer rod 21, return spring 1 22, piston plate 1 23, U-tube 24, baffle 25, pressure sensor 26, return spring 27. Detailed Implementation

[0026] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0027] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0030] Please see Figures 1-4A condensing economizer based on the thermal balance of a gas-fired boiler includes a condensing economizer 10 and a flue gas filter channel 11. The flue gas filter channel 11 is connected to one end of the condensing economizer 10 via a connecting pipe 14. Flue gas generated in the gas-fired boiler is input into the condensing economizer 10 through the flue gas filter channel 11. A main flue gas transmission pipe 12 is provided at the input end of the flue gas filter channel 11. Two sets of flue gas transmission branch pipes 13 are controllably connected to the output end of the main flue gas transmission pipe 12. A flue gas flow direction control component is provided at the connection between the flue gas transmission branch pipe 13 and the main flue gas transmission pipe 12 for automatic control of the input of flue gas from the main flue gas transmission pipe 12 into one of the flue gas transmission branch pipes 13. A connecting port 15 is provided at the output end of the flue gas transmission branch pipe 13. A spring is provided inside the flue gas transmission branch pipe 13. The flue gas entering through the connecting port 15 is filtered by the elastic filter component, and then transferred to the connecting pipe 14 along the rear end of the flue gas transmission branch pipe 13, and finally input into the condensing energy-saving device 10. A lifting opening and closing component is provided at the connecting port 15. The lifting opening and closing component and the elastic filter component are movable. As the impurities on the elastic filter component continue to increase, it moves gradually when pushed by the flue gas, and then synchronously drives the lifting opening and closing component to control the closing of the connecting port 15. After the connecting port 15 is completely closed, the flue gas flow direction component is started to change the flue gas flow direction to another set of flue gas transmission branch pipes 13. At this time, the elastic filter component with a large amount of impurities is cleaned, and it will not affect the normal filtration and transmission of flue gas from the main flue gas transmission pipe 12 to the condensing energy-saving device 10.

[0031] In this embodiment of the invention, the elastic filter assembly, the lifting opening and closing assembly, and the flue gas flow direction control assembly are electrically connected to ensure smooth operation in the control of flue gas flow, opening and closing of the connecting port 15, and filtration of flue gas; the cross-sections of the flue gas transmission branch pipe 13 and the accelerating filtration channel 16 are both set as rectangular structures.

[0032] The ends of both sets of flue gas transmission branch pipes 13 are connected to the connecting pipe 14, and then the flue gas is transmitted to the condenser energy saver 10.

[0033] Meanwhile, in order to maintain the initial flow of flue gas entering the flue gas transmission branch pipe 13, reduce the speed of the gas passing through the connecting port 15 (i.e., reduce the lateral thrust on the lifting opening and closing component), and filter the gas through the elastic filter component at high speed (i.e., maintain sufficient thrust on the elastic filter component), and ensure that the elastic filter component can transmit sufficient lifting force to the lifting opening and closing component, that is, the two can cooperate stably and fully, by making the channel diameter at the connecting port 15 much larger than the channel diameter at the elastic filter component.

[0034] It should be noted that when one set of elastic filter components is in a clean state and the other set of elastic filter components is in the filtering operation state, after cleaning is completed and they are installed and ready for use, as the impurities on the elastic filter components in the filtering state gradually increase, until the corresponding lifting opening and closing component closes the connecting port 15, the flue gas flow direction control component is activated again to control the flow of flue gas to another flue gas transmission branch pipe 13. This process can be repeated to maintain the normal transmission of flue gas and facilitate the cleaning of the elastic filter components.

[0035] In one embodiment of the present invention, the flue gas flow direction control component includes a flue gas flow direction control plate 17 that is oscillating at the junction of two sets of flue gas transmission branch pipes 13 and the main flue gas transmission pipe 12. The end of the flue gas flow direction control plate 17 is rotatably connected to a fixed base plate disposed inside the flue gas filter channel 11 via a rotating shaft. One end of the rotating shaft is connected to a servo motor. The servo motor operates under the connection of the rotating shaft to adjust the oscillation angle of the flue gas flow direction control plate 17, thereby controlling the flow direction of the flue gas in the main flue gas transmission pipe 12.

[0036] In a preferred embodiment of the present invention, the elastic filter assembly includes a rectangular filter plate 18. Two sliders 19 are symmetrically installed on the upper and lower middle parts of the filter plate 18. The inner wall of the acceleration filtration channel 16 corresponding to the sliders 19 is provided with transversely distributed grooves 20. The slider 19 is elastically connected to the groove 20 on the side facing the flue gas transmission branch pipe 13 via a return spring 22. A buffer rod 21 is connected to the other side. When the return spring 22 is in a free state, it controls the filter plate 18 to move to the end of the acceleration filtration channel 16 near the flue gas transmission branch pipe 13. When subjected to the thrust of flue gas flow, as impurities increase, the mesh size gradually decreases, increasing the resistance on the filter plate 18. Then, the filter plate 18 gradually moves away from the acceleration filtration channel 16. At this time, the return spring 22 is stretched, and the buffer rod 21 moves backward. A piston plate 23 is installed at the end of the buffer rod 21. The piston plate 23 slides... A set of U-shaped tubes 24 are dynamically provided. The upper U-shaped tube 24 is set in the inner wall of the flue gas filtering channel 11, and the lower U-shaped tube 24 is set on the fixed base plate. The end of the U-shaped tube 24 away from the piston plate 23 is connected to the lifting opening and closing assembly. The lifting opening and closing assembly includes a baffle 25 that slides along the inside of the U-shaped tube 24 away from the piston plate 23. The bottom of the baffle 25 is connected to a piston plate 2 that slides along the inside of the U-shaped tube 24 through a connecting rod. A pressure sensor 26 is installed at the outer end of the baffle 25. When the U-shaped tube 24 is pushed by the piston plate 23, the piston plate 2 drives the connecting rod to control the baffle 25 to move upward until the pressure sensor 26 at the ends of the upper and lower baffles 25 contacts. At this time, the pressure sensor 26 is subjected to the squeezing force. At this time, the servo motor on the flue gas flow direction control plate 17 drives the flue gas flow direction control plate 17 to swing to the other side, and then the other side connection port 15 is opened.

[0037] It should be noted that, in order to keep the two sets of baffles 25 away from each other when the piston plate 2 is not subjected to thrust, the lower baffle 25 will automatically fall down due to gravity. In order to keep the upper baffle 25 contracted, a set of return springs 27 is elastically connected to the top of the piston plate 2 inside it. The top of the return springs 27 is connected to the inner wall at the corner of the U-shaped tube 24. That is, the elasticity of the return springs 27 is used to keep the upper and lower baffles 25 automatically away from each other.

[0038] It should be noted that the pressure sensor 26 and the servo motor are electrically connected to a control module. The control module performs automated control of the operation and signal transmission of the above components to maintain intelligent operation.

[0039] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A condensing energy-saving device based on the thermal balance of a gas-fired boiler, characterized in that, It includes a condensing energy-saving device (10) and a flue gas filter channel (11); the flue gas filter channel (11) is connected to one end of the condensing energy-saving device (10) through a connecting pipe (14). The flue gas filter channel (11) is equipped with a flue gas transmission main pipe (12) at its input end. The output end of the flue gas transmission main pipe (12) is connected to two sets of flue gas transmission branch pipes (13). A flue gas flow direction control component is provided at the connection between the flue gas transmission branch pipe (13) and the flue gas transmission main pipe (12). A connecting port (15) is provided at the output of the flue gas transmission branch pipe (13). An elastic filter component is provided inside the flue gas transmission branch pipe (13). A lifting opening and closing component is provided at the connecting port (15). The lifting opening and closing component and the elastic filter component are movable.

2. A condensing energy-saving device based on the heat balance of a gas-fired boiler according to claim 1, characterized in that, The elastic filter assembly, the lifting opening and closing assembly, and the flue gas flow direction control assembly are electrically connected, and the cross-sections of the flue gas transmission branch pipe (13) and the accelerated filtration channel (16) are both set as rectangular structures.

3. A condensing energy-saving device based on the heat balance of a gas-fired boiler according to claim 2, characterized in that, The ends of both sets of flue gas transmission branch pipes (13) are connected to the connecting pipe (14), and the channel diameter at the connecting port (15) is larger than the channel diameter at the elastic filter assembly.

4. A condensing energy-saving device based on the heat balance of a gas-fired boiler according to claim 3, characterized in that, The flue gas flow direction control component includes a flue gas flow direction control plate (17) that is oscillating at the connection between the two sets of flue gas transmission branch pipes (13) and the flue gas transmission main pipe (12). The end of the flue gas flow direction control plate (17) is rotatably connected to a fixed base plate set inside the filter flue gas channel (11) via a rotating shaft. One end of the rotating shaft is connected to a servo motor.

5. A condensing energy-saving device based on the heat balance of a gas-fired boiler according to claim 4, characterized in that, The elastic filter assembly includes a rectangular filter plate (18). Two sliders (19) are symmetrically installed on the upper and lower sides of the filter plate (18). The inner wall of the acceleration filter channel (16) corresponding to the slider (19) is provided with transversely distributed grooves (20). The side of the slider (19) facing the flue gas transmission branch pipe (13) is elastically connected to the groove (20) by a return spring (22). The other side is connected to a buffer rod (21). The return spring (22) is in a free state. At that time, the control filter plate (18) moves to the end of the accelerated filtration channel (16) near the end of the flue gas transmission branch pipe (13). A piston plate (23) is installed at the end of the buffer rod (21). A set of U-shaped tubes (24) is slidably arranged at the end of the piston plate (23). The upper U-shaped tube (24) is arranged in the inner wall of the flue gas filtration channel (11), and the lower U-shaped tube (24) is arranged on the fixed base plate. The end of the U-shaped tube (24) away from the piston plate (23) is connected to the lifting opening and closing assembly.

6. A condensing energy-saving device based on the heat balance of a gas-fired boiler according to claim 5, characterized in that, The lifting opening and closing assembly includes a baffle (25) that slides along the inside of the U-shaped tube (24) away from the piston plate (23). The bottom of the baffle (25) is connected by a connecting rod to a piston plate (2) that slides in contact with the inside of the U-shaped tube (24). A pressure sensor (26) is installed at the outer end of the baffle (25).

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