A flue gas condensation pipe and a gas heater

Abstract

The present invention provides a flue gas condensing pipe and a gas heater, which are used to solve the technical problems in the prior art that the condensed water in the gas heating device will accumulate in the pipeline or extinguish the flame, the utilization rate of the calorific value of the gas is low, and the heat recovery rate of the flue gas is low; a flue gas condensing pipe includes a water tank and a fire tube, and a gas heater includes a flue gas condensing pipe, a housing, a condensed water inlet, a condensed water outlet, a combustion chamber, a gas pipe, a condensed water discharging device, an exhaust fan, a controller, a condensed water guiding device and a power supply; by implementing the technical solution of the present invention, a high-temperature section condensing pipe and a low-temperature section condensing pipe are provided to prevent condensed water from extinguishing the flame in the high-temperature section condensing pipe; the low-temperature section condensing pipe adopts a serpentine pipe with a relatively long length, and has a high flue gas heat recovery efficiency, effectively improving the thermal power of the heater; a bottom condensed water drainage device is provided to discharge the condensed water in real time; with a reasonable excess air coefficient, the gas burns fully, with a high calorific value utilization rate and preventing the generation of carbon monoxide at the same time.

Description

Technical Field

[0001] The present invention relates to the field of heating equipment, and particularly to a flue gas condensation pipe and a gas heater. Background Art

[0002] Heating equipment is widely used in the fields of domestic heating and industrial heat supply. Among them, the commonly used one is a gas heating furnace. Gas heating furnaces are mainly divided into two categories. One category directly uses gas to heat hot water, and the other category transfers heat to hot water through heat exchange of the flue gas generated by combustion in a condensation pipe. In the prior art, the following problems exist in the flue gas condensation pipe: After the flue gas condensation pipe cools down to below 100°C, the generated condensed water will flow back to extinguish the flame or accumulate in the pipeline, affecting the heat exchange effect; the low heat exchange efficiency results in a large amount of heat being carried away by the flue gas and wasted; the gas burns insufficiently, resulting in the generation of carbon monoxide and low calorific value utilization rate of the gas.

[0003] Therefore, there is a need for a flue gas condensation pipe and a gas heater with high heat recovery efficiency, sufficient gas combustion, and proper treatment of condensed water so as not to extinguish the flame. Summary of the Invention

[0004] In order to solve the above technical problems, a flue gas condensation pipe and a gas heater are disclosed in the present invention. The technical solutions of the present invention are implemented as follows:

[0005] A flue gas condensation pipe includes: a fire tube and a water tank; wherein, the fire tube is arranged inside the water tank, and a liquid cavity is formed between the water tank and the fire tube; the fire tube includes a flue gas inlet, a high-temperature section condensation pipe, a low-temperature section condensation pipe, and a flue gas outlet arranged in sequence; the diameter of the flue gas inlet is larger than that of the high-temperature section condensation pipe; the low-temperature section condensation pipe is provided with a bottom condensed water drainage device; the low-temperature section condensation pipe is a serpentine pipe; the main body of the high-temperature section condensation pipe is a rifled pipe.

[0006] Preferably, the high-temperature section condensation pipe further includes wing plates arranged on both sides of the rifled pipe.

[0007] Preferably, the cross-section of the fire tube is elliptical.

[0008] Preferably, the bottom condensed water drainage device is a drainage pipe, and the drainage pipe communicates with the inside of the low-temperature section condensation pipe and extends outside the water tank.

[0009] A gas heater, comprising a flue gas condensation pipe, a housing, a condensate inlet, a condensate outlet, a combustion chamber, a gas pipe, a condensate discharge device, an exhaust fan, a controller and a power supply, having the aforementioned features; the number of the flue gas condensation pipes is greater than or equal to one; the flue gas condensation pipe and the combustion chamber are fixed to the housing, and the flue gas inlet communicates with the combustion chamber; the combustion chamber is fixed to the housing, and the gas pipe communicates with the combustion chamber; the condensate inlet and the condensate outlet are fixed to the housing and communicate with the liquid chamber; the exhaust fan is fixed to the housing and communicates with the flue gas outlet, and the power supply is connected to the exhaust fan; the condensate discharge device is fixed to the housing, communicates with the bottom condensate drainage device and extends to the outside of the housing; a gas valve is provided on the gas pipe; the controller is fixed to the outer shell and is connected to the power supply and the exhaust fan; the condensate discharge device is fixed to the outer shell and is connected to the bottom condensate drainage device of the flue gas condensation pipe.

[0010] Preferably, the combustion chamber includes a connecting plate and baffles arranged around the connecting plate, and the flue gas inlet is connected to the connecting plate.

[0011] Preferably, the condensate inlet is arranged at the top of the housing and is connected to one end of the liquid chamber close to the flue gas inlet; the condensate outlet is arranged at the top of the housing and is connected to one side of the liquid chamber close to the flue gas outlet.

[0012] Preferably, the exhaust fan controls the excess air coefficient of the air flowing into the combustion chamber to be 0.5 - 5.

[0013] Preferably, the gas heater further includes more than one sensor, and the sensor is connected to the controller; the sensor includes one or more of a temperature sensor, a pressure sensor or a flow sensor.

[0014] Implementing the technical solution of the present invention can solve the technical problems in the prior art that condensate water in the gas heating device will accumulate in the pipeline or extinguish the flame, the utilization rate of gas calorific value is low, and the heat recovery rate of flue gas is low; implementing the technical solution of the present invention, a high-temperature section condensation pipe and a low-temperature section condensation pipe are provided to prevent condensate water from extinguishing the flame in the high-temperature section condensation pipe; the low-temperature section condensation pipe adopts a serpentine pipe with a longer length, and the flue gas heat recovery efficiency is high, effectively improving the heat power of the heater; a bottom condensate drainage device is provided to discharge condensate water in real time; with a reasonable excess air coefficient, the gas burns fully, the calorific value utilization rate is high and the generation of carbon monoxide is prevented. Description of the Drawings

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only one embodiment of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0016] Figure 1 Schematic diagram of the flue gas condensation pipe structure of a specific embodiment of the present invention;

[0017] Figure 2 Schematic diagram of the high-temperature section condensation pipe structure of a specific embodiment of the present invention;

[0018] Figure 3 Schematic diagram of the fire tube structure of a specific embodiment of the present invention;

[0019] Figure 4 Schematic diagram of the gas heater structure of a specific embodiment of the present invention;

[0020] Figure 5 Schematic diagram of the internal structure of the delay condenser of a specific embodiment of the present invention;

[0021] Figure 6 Schematic diagram of the combustion chamber structure of a specific embodiment of the present invention;

[0022] Figure 7 Schematic diagram of the condensate drainage device structure of a specific embodiment of the present invention.

[0023] In the above drawings, each reference numeral represents:

[0024] 1 - Fire tube; 2 - Water tank; 3 - Liquid chamber; 4 - Flue gas inlet; 5 - High-temperature section condensation pipe; 6 - Low-temperature section condensation pipe; 7 - Flue gas outlet; 8 - Bottom condensate drainage device; 9 - Flue gas condensation pipe; 10 - Shell; 11 - Condensate inlet; 12 - Condensate outlet; 13 - Combustion chamber; 14 - Gas pipe; 15 - Condensate discharge device; 16 - Exhaust fan; 17 - Controller; 18 - Connection plate; 19 - Baffle; 20 - Flue gas hole; 21 - Sensor. Specific embodiments

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0026] In a specific embodiment of the present invention, a flue gas condensation pipe 9, as shown in Figure 1 , Figure 2 , Figure 3 , Figure 5 and Figure 7 , includes: a fire tube 1 and a water tank 2; wherein, the fire tube 1 is arranged inside the water tank 2, and a liquid cavity 3 is formed between the water tank 2 and the fire tube 1; the fire tube 1 includes a flue gas inlet 4, a high-temperature section condensation pipe 5, a low-temperature section condensation pipe 6, and a flue gas outlet 7 arranged in sequence; the diameter of the flue gas inlet 4 is larger than that of the high-temperature section condensation pipe 5; the low-temperature section condensation pipe 6 is provided with a bottom condensate drainage device 8; the low-temperature section condensation pipe 6 is a serpentine pipe; the main body of the high-temperature section condensation pipe 5 is a rifled pipe.

[0027] In this specific embodiment, the fire tube 1 and the water tank 2 can be made of stainless steel, which has low cost, high strength, is easy to install, and has a relatively high heat transfer coefficient. Both the fire tube 1 and the water tank 2 can be welded and combined by welding process. The fire tube 1 and the water tank 2 can be welded and fixed at both ends to reduce the influence of the connection structure on the flow of condensate in the liquid cavity 3. The high-temperature section condensation pipe 5 and the flue gas outlet 7 are arranged vertically, and the straight pipe part of the low-temperature section condensation pipe 6 is arranged horizontally. After the flue gas enters the flue gas inlet 4, it quickly rises along the vertical direction. Since the length of the high-temperature section condensation pipe 5 is short, by controlling parameters such as the flue gas flow rate and the condensation pipe flow rate, the flue gas can be higher than 100 °C when entering the low-temperature section condensation pipe 6. Therefore, no condensate will appear in the high-temperature section condensation pipe 5, which can avoid the situation of condensate extinguishing the flame and improve the safety and reliability of the device. The low-temperature section condensation pipe 6 is set as a serpentine pipe, and the total pipe length is relatively long, which is conducive to the full heat exchange between the condensate and the flue gas, improves the heat recovery efficiency of the flue gas condensation pipe 9, and reduces the temperature of the flue gas when it is discharged. When the flue gas gradually cools below 100 °C, the moisture in the flue gas gradually condenses, and the formed condensate flows along the serpentine pipe to the lowest part of the low-temperature section condensation pipe 6 and flows out from the bottom condensate drainage device 8, avoiding the airflow disorder or flue gas pipe blockage caused by the accumulation of condensate and reducing the maintenance cost of the device.

[0028] Rifles are arranged inside the high-temperature section condensation pipe 5 to disturb the flue gas, so that the low-temperature gas near the pipe wall and the high-temperature gas near the pipe center in the flue gas are fully mixed in the turbulent flow, improving the heat exchange efficiency of the flue gas in the high-temperature section condensation pipe 5, quickly cooling the flue gas in the high-temperature section condensation pipe 5, and improving the overall heat recovery efficiency of the extended condensation pipe. At the same time, the temperature of the flue gas entering the low-temperature section condensation pipe 6 is relatively low, and the heat resistance performance requirements for the low-temperature section condensation pipe 6 are low, which is conducive to extending the overall life of the device. The flue gas has a high temperature and a low air pressure, resulting in a large gas flow rate at the flue gas inlet 4. As the flue gas condenses, the air pressure of the flue gas gradually increases and the gas flow rate gradually decreases. In order to enable the flue gas condensation pipe 9 to work normally, the diameter of the flue gas inlet 4 is set to be larger than the main body of the rest of the fire tube 1.

[0029] In a preferred embodiment, as Figure 1 , Figure 2 and Figure 3 shown, the high-temperature section condensate pipe 5 further includes wing plates disposed on both sides of the rifled pipe. The wing plates can also be made of stainless steel material, can be fixed to the rifled pipe by welding, and the wing plates can also be integrally manufactured with the rifled pipe. The provision of the wing plates facilitates the fixing of the fire pipe 1 to the water tank 2. The outer extension of the wing plates can be welded to the water tank 2. At the same time, the wing plates themselves have heat conductivity and can absorb a part of the heat from the rifled pipe and conduct it into the liquid cavity 3, further increasing the heat recovery speed of the high-temperature section condensate pipe 5.

[0030] In a preferred embodiment, as Figure 1 and Figure 3 shown, the cross-section of the fire pipe 1 is oval. Compared with the traditional square pipe-shaped condensate pipe, the forming process of the oval fire pipe 1 is simpler, which is beneficial to reducing the production cost. At the same time, it effectively reduces the stagnant flow dead angle and increases the heat exchange area. Compared with the traditional circular condensate pipe, the oval fire pipe 1 increases the surface area, that is, the heat exchange area, under the condition of the same flow area, which is beneficial to improving the overall heat recovery efficiency of the condensate pipe.

[0031] In a preferred embodiment, as Figure 1 , Figure 5 and Figure 7 shown, the bottom condensate drainage device 8 is a drainage pipe, which communicates with the inside of the low-temperature section condensate pipe 6 and extends outside the water tank 2. The low-temperature section condensate pipe 6 is a serpentine pipe, and the condensate water generated therein will flow along the serpentine pipe to the bottom and flow out of the flue gas condensate pipe 9 through the drainage pipe. The flue gas flows out from the flue gas outlet 7 under the action of the exhaust fan 16, and the condensate water flows out through the drainage pipe under the action of gravity. The drainage pipe has a simple structure and is conducive to mass production.

[0032] A gas heater comprises a flue gas condensing pipe 9 having the above-mentioned characteristics, a shell 10, a condensate inlet 11, a condensate outlet 12, a combustion chamber 13, a gas pipe 14, a condensate discharge device 15, an exhaust fan 16, a controller 17 and a power supply; the number of the flue gas condensing pipes 9 is greater than or equal to one; the flue gas condensing pipe 9 and the combustion chamber 13 are fixed to the shell 10, and the flue gas inlet 4 is connected to the combustion chamber 13; the combustion chamber 13 is fixed to the shell 10, and the gas pipe 14 is connected to the combustion chamber 13; the condensate inlet 11 and the condensate outlet 12 are fixed to the shell 10, and are connected to the liquid cavity 3; the exhaust fan 16 is fixed to the shell 10, and is connected to the flue gas outlet 7, and the power supply is connected to the exhaust fan 16; the condensate discharge device 15 is fixed to the shell 10, and is connected to the bottom condensate drainage device 8, and extends to the outside of the shell 10; the gas pipe 14 is provided with a gas valve; the controller 17 is fixed to the shell, and is connected to the power supply and the exhaust fan 16; the condensate outlet device is fixed to the shell, and is connected to the bottom condensate drainage device 8 of the flue gas condensing pipe 9.

[0033] In this specific embodiment, the main components of the gas heater can be made of stainless steel, which is resistant to high temperature and corrosion and has high strength, low cost, and is conducive to mass production. The components in the shell 10 can be fixed to the shell 10 by welding, or by bolts or other detachable methods, which is convenient for disassembly and installation, and reduces the time cost and labor cost of subsequent maintenance. The bottom of the shell 10 is open, and the combustion chamber 13 is arranged at the bottom of the shell 10. The temperature of the flue gas after the combustion of the gas is relatively high, and it automatically flows upward. At the same time, under the action of the exhaust fan 16, a negative pressure is formed in the flue gas condensation pipe 9, and the flue gas is sucked into the flue gas condensation pipe 9. The position of the gas outlet of the gas pipe 14 is adjusted to prevent the leakage of flue gas.

[0034] The exhaust fan 16 can use a turbine exhaust fan, which is arranged on the top of the shell and connected to multiple smoke outlets 7. There are two exhaust fans 16, which are respectively used to connect different smoke outlets 7 to provide sufficient power for the smoke. The user can choose a suitable number of smoke outlets 7 according to needs. The smoke condenser 9 is arranged as a whole in a vertical plane, the high-temperature section condenser 5 and the smoke outlet 7 are arranged vertically, the straight tube part of the low-temperature section condenser 6 is arranged horizontally, and multiple smoke condenser tubes 9 are arranged in an interlaced manner to maximize the use of the space inside the shell, which is conducive to reducing the overall volume of the device. The condensate inlet 11 can be connected to an external condensate pumping system or other industrial water pipelines, and the condensate outlet 12 is connected to a heat pipe for utilizing the recovered smoke heat. The controller 17 is a touch screen for displaying the working status of the gas heater and controlling its working status. The gas valve can use an electronic valve, which is electrically connected to the controller 17. The controller 17 can also select a simple switch or a complex industrial computer and other equipment according to the situation. The condensate outlet device can be a guide groove, and the condensate flowing out of multiple drainage pipes flows out through the guide groove.

[0035] In a preferred embodiment, as Figure 1 and Figure 6 shown, the combustion chamber 13 includes a connecting plate 18 and baffles 19 disposed around the connecting plate 18, and the flue gas inlet 4 is connected to the connecting plate 18.

[0036] A plurality of flue gas holes 20 conforming to the shape of the flue gas inlet 4 are provided on the connecting plate 18 for connecting the flue gas inlet 4. Baffles 19 are provided around the combustion chamber 13, and the supply end of the gas pipe 14 can be disposed inside the chamber formed by the connecting plate 18 and the baffles 19, so that the combustion flame does not spill out, preventing foreign objects from flying in or the gas from being extinguished by wind or snow, and improving the reliability and safety of the device.

[0037] In a preferred embodiment, as Figure 1 , Figure 4 , Figure 5 and Figure 7 shown, the condensate inlet 11 is provided at the top of the housing 10 and is connected to one end of the liquid chamber 3 close to the flue gas inlet 4; the condensate outlet 12 is provided at the top of the housing 10 and is connected to one side of the liquid chamber 3 close to the flue gas outlet 7. The condensate is discharged in a bottom-in and top-out manner, effectively discharging the bubbles in the liquid chamber 3, eliminating the hidden danger of dry burning, while enabling the condensate to fully exchange heat in the water tank 2, greatly improving the heat exchange efficiency of the condensate pipe, enabling the gas heater to achieve a higher calorific value utilization rate under high gas supply, and enabling the gas heater to operate with high power and high heat utilization rate. The condensate inlet 11, the condensate outlet 12, and the flue gas outlet 7 of the gas heater are all provided at the top of the housing 10, which is convenient for maintenance. The condensate inlet 11 and the condensate outlet 12 are connected to the liquid chamber 3 through pipes and can be welded to the liquid chamber 3.

[0038] In a preferred embodiment, as Figure 4 and Figure 5 shown, the exhaust fan 16 controls the excess air coefficient of the air flowing into the combustion chamber 13 to be 0.5 - 5. In this specific embodiment, the gas used is natural gas, and the excess air coefficient is 1.18. At this excess air coefficient, the flow rate, pressure of the exhaust fan 16, the gas supply amount, and the flow rate of the condensate flue reach the optimal effect, which can greatly improve the utilization rate of the gas calorific value. At the same time, it can make the gas burn fully, prevent the generation of carbon monoxide, and improve the safety of the device. At this excess air coefficient, combined with the structural design of the condensate pipe, the thermal efficiency can reach 106% under the full-power operation of the maximum gas flow combustion, greatly improving the combustion power and far exceeding the heat recovery capacity of existing equipment.

[0039] In a preferred embodiment, a gas heater, as Figure 1 , Figure 3 , Figure 4 and Figure 5As shown, it further includes more than one sensor 21, and the sensor 21 is connected to the controller 17; the sensor 21 includes one or more of a temperature sensor, a pressure sensor or a flow sensor. In the gas heater, a temperature sensor can be arranged at the flue gas outlet 7 to monitor the flue gas temperature, a temperature sensor can be arranged at the condensate outlet 12 to monitor the condensate temperature, and a gas pressure sensor or a flow sensor can be arranged in the fire tube 1 to monitor the flue gas pressure or flow rate. The user can select a suitable sensor 21 from aspects such as cost and monitoring method to monitor the working condition of the gas heater.

[0040] It should be noted that the above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A flue gas condensation pipe, characterized in that, include: A fire tube and a water bladder; wherein the fire tube is arranged inside the water bladder, and a liquid cavity is formed between the water bladder and the fire tube; The fire tube includes a smoke inlet, a high temperature section condenser, a low temperature section condenser and a smoke outlet which are arranged in sequence; The flue gas inlet pipe diameter is larger than the high temperature section condenser pipe; The low temperature section condenser tube is provided with a bottom condensed water drainage device; The low temperature section condenser tube is a serpentine tube; The main body of the high temperature section condenser tube is a rifled tube; The high-temperature section condenser pipe and the flue gas outlet are vertically arranged, and the straight pipe part of the low-temperature section condenser pipe is horizontally arranged.

2. The flue gas condensation pipe according to claim 1, characterized in that, The high temperature section condenser tube further comprises wing plates arranged on both sides of the rifling tube.

3. A flue gas condensation pipe according to claim 2, characterized in that, The cross section of the fire tube is elliptical.

4. The flue gas condensation pipe according to claim 3, characterized in that, The bottom condensed water drainage device is a drainage pipe, which is connected to the interior of the low-temperature section condenser pipe and extends to the outside of the water tank.

5. A gas heater, characterized in that, Comprising: a flue gas condensation pipe according to any one of claims 1 to 4, a shell, a condensate inlet, a condensate outlet, a combustion chamber, a gas pipe, a condensate discharge device, an exhaust fan, a controller, a condensate outlet device and a power supply; The number of the flue gas condensation tubes is greater than or equal to one; The flue gas condensation pipe and the combustion chamber are fixed to the housing, and the flue gas inlet is connected to the combustion chamber; The combustion chamber is fixed to the shell, and the gas pipe is connected to the combustion chamber; The condensed water inlet and the condensed water outlet are fixed to the shell and communicate with the liquid chamber; The exhaust fan is fixed to the housing and connected to the smoke outlet, and the power supply is connected to the exhaust fan; The condensate discharge device is fixed to the shell, connected to the bottom condensate drainage device, and extends to the outside of the shell; The gas pipe is provided with a gas valve; The controller is fixed to the housing and connected to the power supply and the exhaust fan; The condensate outlet device is fixed to the shell and connected to the bottom condensate outlet device of the flue gas condensation pipe.

6. The gas heater according to claim 5, characterized in that, The combustion chamber comprises a connecting plate and baffles arranged around the connecting plate, and the smoke inlet is connected to the connecting plate.

7. A gas heater according to claim 6, characterized in that, The condensed water inlet is arranged at the top of the shell, connected to one end of the liquid cavity close to the smoke inlet; the condensed water outlet is arranged at the top of the shell, connected to one side of the liquid cavity close to the smoke outlet.

8. A gas heater according to claim 7, characterized in that, The exhaust fan controls the excess air coefficient of the air flowing into the combustion chamber to be 0.5-5.

9. A gas heater according to claim 8, characterized in that, Also includes one or more sensors, wherein the sensors are connected to the controller; The sensor includes one or more of a temperature sensor, a pressure sensor or a flow sensor.

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