CN110645709A - A high-efficiency condensing gas-fired water heater and system with mixed heat exchange - Google Patents

Abstract

The invention discloses a high-efficiency condensing gas-fired water heater with mixed heat exchange and a system. The water heater includes a burner, a heat exchanger, and an isobaric smoke separating a spray system that directly contacts heat exchange from the heat exchanger. hood and chimney; reasonable thermal design makes the high-temperature flue gas cool down after heat exchange in the heat exchanger and no condensate water is generated. Since the heat exchanger does not need to consider the corrosion of condensate water, the material level and process cost of the partition heat exchanger can be reduced; direct The spray system of contact heat exchange atomizes and sprays the circulating spray liquid to fully absorb the latent heat of the low-temperature flue gas. The circulating spray liquid can use the organic or water working medium that is safe, non-toxic, good thermal conductivity, low viscosity and hydrophobic; high efficiency The condensing gas water heater and the heat pump are connected to form an efficiency-enhancing and energy-saving system, which reduces the temperature of the circulating spray liquid and further improves the condensation heat transfer efficiency of the low-temperature flue gas, thereby improving the overall operation efficiency of the water heater and the system. The invention effectively improves the overall system operation efficiency. And through the spray system to further reduce the flue gas carbon emissions.

Description

A high-efficiency condensing gas-fired water heater and system with mixed heat exchange

technical field

The invention belongs to the field of heat exchange heat exchangers with improved energy utilization efficiency, energy saving and environmental protection, and in particular relates to a high-efficiency condensing gas-fired water heater and a system for mixed heat exchange.

Background technique

The low-nitrogen high-efficiency condensing gas water heater is an upgraded water heater with advanced technology and market promotion potential in the new generation after years of technical research and development in response to the increasingly strict energy-saving and environmental protection emission requirements worldwide. The existing low-nitrogen high-efficiency condensing gas water heater organically combines ultra-efficient and compact heat exchangers and ultra-low-nitrogen, high-efficiency full premix burners, integrating low-nitrogen gas emissions, radiant heat transfer, turbulence and condensation in the field of thermal energy engineering Strengthen a number of key technologies such as heat transfer, water circulation, new materials, new processes and climate compensation dynamic control to jointly achieve the dual technical goals of ultra-low emissions and ultra-efficient waste heat recovery. This technical goal can greatly improve the utilization efficiency of natural gas clean heating, making low-nitrogen high-efficiency condensing gas-fired water heaters a rigid choice to replace traditional steel and cast-iron gas-fired boilers. Low-nitrogen and high-efficiency condensing gas water heaters can be divided into domestic condensing gas water heaters and commercial condensing gas water heaters according to the heating power. For domestic condensing gas wall-mounted water heaters (≤50kW) and condensing gas floor water heaters (<100kW), while the capacity of commercial gas water heaters is greater than or equal to 100kW to 2800kW, but the number of integrated modules can reach 28MW (equivalent to traditional gas water heaters). 40t/h boiler heating capacity, which can be used for 400,000 m ² building heating) still has technical economy. Whether it is a condensing gas wall-hung boiler, a condensing gas floor furnace or a commercial condensing gas water heater, its basic composition is an organic combination of an ultra-low nitrogen fully premixed flameless burner and an ultra-efficient compact heat exchanger, which is specially used for livelihood supply. Domestic hot water and heating hot water products, among which condensing gas wall-hung boilers and condensing gas floor-standing boilers are mainly used in households to supply domestic hot water and heating hot water at the same time, while commercial condensing gas water heaters are mainly used in schools, hospitals, commercial residences , Living quarters supply domestic hot water and heating hot water at the same time, or can supply heating water alone. Domestic condensing gas water heaters and commercial condensing gas water heaters have some differences in structure, but the overall technical principle and core are the same.

Although the high-power, low-nitrogen, high-efficiency condensing gas-fired water heater is put into use, it can effectively save energy, but its manufacturing cost remains high, mainly due to the large volume and weight of the heat exchanger body corresponding to the high-power water heater. In the area with high flue gas temperature, the heat exchange capacity is strong due to the large end difference; in the area with low flue gas temperature, the end difference is small, the heat flux density is small, the heat exchange capacity of the heat exchanger is weak, and the required heat exchange area, It is very bulky. The low-efficiency heat exchange area with lower flue gas temperature is the key factor affecting the quality and cost control of the heat exchanger of the hot water boiler. For small-end differential heat exchange, the thermal resistance of the direct contact heat exchange method using the spray method is significantly smaller than the indirect heat exchange method using the heat exchanger, and the direct contact heat exchange method can effectively reduce the cost of the heat exchanger.

SUMMARY OF THE INVENTION

In order to effectively reduce the cost of the low-nitrogen high-efficiency condensing gas-fired water heater and further improve the heat exchange efficiency of the low-nitrogen high-efficiency condensing gas-fired water heater, the present invention provides a hybrid heat-exchange high-efficiency condensing gas-fired water heater and a system.

The present invention is achieved through the following technical solutions:

A high-efficiency condensing gas-fired water heater with mixed heat exchange, comprising a burner 1 that burns to generate high-temperature flue gas, a heat exchanger 2 that absorbs the heat of the high-temperature flue gas, and a spray system 4 that isolates the heat exchanger 2 and exchanges heat during heat exchange. The outer wall of the burner 2 forms the isobaric hood 3 of the flue gas isobaric channel, which covers the burner 1, the heat exchanger 2, the isobaric hood 3 and the shell 5 of the spray system 4, and the chimney 6 is arranged on the shell 5; The low-temperature flue gas released by the heat exchanger 2 passes through the passage between the shell 5 and the isobaric hood 3 and is further absorbed by the spray system 4 after sensible heat and latent heat, and finally discharged from the chimney 6;

The cross-sectional shape of the burner 1 is a circle, a waist circle or an ellipse, and is arranged on the overall centerline of the water heater or offsets the overall centerline of the water heater to optimize the flow of flue gas and reduce the flow resistance;

The heat exchanger 2 includes a heat exchanger body 21, a heat exchanger water inlet 22 and a heat exchanger water outlet 23 communicated with the heat exchanger body 21;

The isobaric fume hood 3 includes a cover plate 31 and a low temperature fume outlet 32;

The spray system 4 includes a spray liquid inlet 41 located at the top of the casing 5 or on the peripheral side of the casing 5. When the spray liquid inlet 41 is located at the top of the casing 5, it includes a connection between the spray liquid inlet 41 and the ring pipe 43. The flow equalizing pipe 42, the annular pipe 43 is located between the equalizing pipe 42 and the cover plate 31 in the vertical direction, and the annular pipe 43 and the equalizing pipe 42 form an included angle of 90° to 120°. When the spray inlet 41 is located in the casing On the 5th side, the high-pressure equalizing spray method is adopted to eliminate the structure of the equalizing pipe 42, simplify the manufacturing process and ensure the structural strength, and the ring pipe 43 is highly parallel to the spray inlet 41; The atomizing nozzle 44, the condensed water discharge port 45 and the spray liquid outlet 46 at the bottom end of the casing 5;

A chimney connection channel 51 is arranged at the top of the casing 5, and a dew plate 52 is arranged at the bottom.

The heat exchanger main body 21 controls the wall temperature to be higher than 60°C under any working conditions, and controls the exhaust gas temperature to be in the range of 110 to 260°C, so that the heat exchanger wall does not produce condensed water. The heat exchanger body 21 is made of cast aluminum, cast iron, carbon steel, welded stainless steel, copper or copper finned tubes.

The heat exchanger water inlet 22 and the heat exchanger water outlet 23 are placed at the bottom of the heat exchanger body 21 or at the bottom or the top respectively according to different types of the heat exchanger body 21 .

The isobaric fume hood 3 is manufactured separately or integrally formed with the outer shell 5. When the isobaric fume hood 3 adopts the low-temperature flue gas outlet 32 at the bottom, it forms a preset angle with the vertical direction, or the surface of the isobaric fume hood 3 has a The uniform ridge-type exhaust port is vertically arranged, which can make the flow of flue gas under the rated load to pass through the flue gas isobaric channel between the isobaric hood 3 and the main body of the heat exchanger 21, so as to ensure the main body of the heat exchanger. The high temperature flue gas in 21 exchanges heat evenly, and the cover plate 31 of the isobaric fume hood 3 is designed to be top, bottom or top and bottom double arrangement according to the arrangement of the heat exchanger inlet 22 and the heat exchanger outlet 23 to ensure the heat exchanger 2. It can be placed in the isobaric fume hood 3. The low-temperature fume outlet 32 at the bottom of the isobaric fume hood 3 has 4 to 24 annular openings, and there are spokes between them to strengthen the structural strength. The low-temperature fume outlet The included angle between the plane 32 and the horizontal direction is 0-60°. When the isobaric fume hood 3 and the outer shell 5 are integrally formed and manufactured, the top cover plate 31 also has the structure of the low-temperature fume outlet 32 .

When the spray liquid inlet 41 is located at the top of the casing 5, there are 3 to 9 equalizing pipes 42 connected between the spray liquid inlet 41 and the ring pipe 43, so that the spray liquid flows into the ring from the spray liquid inlet 41 evenly. In the pipe 43, the cross-section of the ring pipe 43 is a waist circle, a square, a circle or an ellipse, and the ring pipe 43 is arranged with 6 to 18 atomizing nozzles 44 in the circumferential direction, and 1 to 4 atomizing nozzles in the radial direction at the same time. 44. The cross section of the atomizing nozzle 44 is a waist circle, a square, a circle or an ellipse, and the angle θ to the vertical direction is 0 to 90°. The spray system 4 of one stage or multi-stage is adopted, and the spray system 4 adopts the spray form of overhead or inversion or a combination of overhead and inversion to achieve high-efficiency heat transfer.

The condensate water outlet 45 has a U-shaped structure, so that the dew plate 52 can accumulate a certain liquid level, the condensate water generated during the continuous operation of the water heater is discharged from the condensate water outlet 45, and the spray liquid outlet 46 is used for discharge circulation. The spray liquid is also located at the bottom end of the shell 5 but higher than the condensate water outlet 45. The circulating spray liquid adopts a safe, non-toxic, good thermal conductivity, low viscosity and hydrophobic organic working medium or a water working medium.

The casing 5 is made of stainless steel, cast aluminum silicon or plastic material that is resistant to condensation water corrosion, and the exposed plate 52 has a certain height to accommodate the circulating spray liquid and condensed water, and at the same time, the circulating spray liquid can be made of safe, non-toxic, thermally conductive material. Good, low viscosity and hydrophobic organic working medium and condensed water liquid, so that the condensed water and the circulating spray liquid are discharged from the bottom condensed water discharge port 45 and the spray liquid outlet 46 respectively.

The efficiency-enhancing and energy-saving system for a high-efficiency condensing gas-fired water heater using the mixed heat exchange described above includes a heat pump system 7, a plate heat exchanger 8, a valve group 9, and the above-mentioned high-efficiency condensing gas-fired heat exchanger for mixed heat exchange. Water boiler, the heat exchanger 2 and the condenser 72 in the heat pump system 7 constitute the main heat exchange subsystem, and the connection mode of the main heat exchange subsystem is: the water outlet 23 of the heat exchanger, the inlet of the plate heat The outlet of the heat exchanger 8—the inlet of the condenser 72, the outlet of the condenser 72, and the water inlet 22 of the heat exchanger are connected in sequence, and the spray system 4 and the evaporator 71 in the heat pump system 7 constitute a secondary spray heat exchange subsystem, The connection mode of the secondary spray heat exchange subsystem is as follows: the spray liquid outlet 46, the evaporator 71 inlet, the evaporator 71 outlet, and the spray liquid inlet 41 are connected in sequence; the evaporator 71 and the condenser in the heat pump system 7 are connected in sequence; The inlet and outlet pipes of 72 are installed with valves 91 to form valve group 9, and short-circuit valves 92 are installed on the inlet and outlet short-circuit pipes of condenser 72. When the heat pump system 7 is activated, the short-circuit valve 92 is closed, and all valves in valve group 9 are closed. 91 is open, when the heat pump system is turned off, all valves 91 in the valve group 9 are closed.

Reduce the temperature of the circulating spray liquid to further strengthen the condensation heat transfer efficiency of the low-temperature flue gas, increase the return water temperature of the water inlet 22 of the heat exchanger, make the water heater and the heat pump synergistically coupled, effectively improve the overall system operation efficiency, and reduce the load return water Sensitivity of temperature fluctuations to operating efficiency.

All components in the high-efficiency gas-fired water heater integrating indirect and direct contact heat exchange are flexibly configured, and the overall arrangement can be in the form of surrounding arrangement, left-right arrangement and up-down arrangement.

Compared with the prior art, the present invention has the following advantages:

1. The water heater of the present invention adopts the form of indirect and direct contact composite heat exchange. The main body of the heat exchanger controls the wall temperature to be higher than 60°C under any working conditions, and preferably the exhaust gas temperature is controlled within the range of 180 to 300°C, so that the heat exchange can be achieved. No condensed water will be generated on the wall of the heat exchanger, and there will be no problems such as condensed water corrosion. You can use cast aluminum, cast iron, carbon steel, welded stainless steel, copper finned tube materials and heat exchangers with any process and structure to reduce the threshold for use of heat exchangers. .

2. The water heater of the present invention adopts the indirect and direct contact composite heat exchange form, and uses the spray direct contact heat exchange method to replace the areas in the heat exchanger where the flue gas temperature is low, the end difference is small, the heat flux density is small and the heat exchange capacity is weak. , thereby eliminating a large number of inefficient areas of heat exchangers, effectively reducing the amount of raw materials and process costs of heat exchangers.

3. In the heat exchange of low temperature flue gas with small end difference, the water heater of the present invention adopts spray direct contact heat exchange to strengthen condensation heat exchange, effectively reducing the volume of the water heater and making the furnace body more compact.

4. The system of the present invention adopts a coupled heat pump design, which reduces the temperature of the circulating spray liquid to further strengthen the condensation heat transfer efficiency of the low-temperature flue gas, increases the temperature of the return water at the water inlet of the heat exchanger, and couples the efficiency of the water heater and the heat pump, effectively improving the overall efficiency. System operation efficiency, and reduce the sensitivity of load return water temperature fluctuations to operation efficiency.

Description of drawings

FIG. 1 is an overall schematic diagram of an integrated high-efficiency condensing gas-fired water heater and a heat pump coupled to form an efficiency-enhancing and energy-saving system according to the present invention.

Fig. 2 is a three-dimensional view of a high-efficiency condensing gas-fired water heater integrating indirect and direct contact heat exchange, wherein Fig. 2(a) is a front view, and Fig. 2(b) is a half-section view.

Figure 3 is a three-dimensional view of a high-efficiency condensing gas-fired water heater integrated with indirect and direct contact heat exchange using the integral injection molding of the isobaric fume hood 3 and the casing 5, in which Figure 3(a) is a front view, and Figure 3(b) is a Half cutaway.

Fig. 4 is a three-dimensional view of an integrated high-efficiency condensing gas-fired water heater using the spray liquid inlet 41 arranged on the outer side of the casing 5 and adopting a single-side or double-side liquid inlet method, in which Fig. 4(a) is a front view, and Fig. 4 (b) is a half cross-sectional view, and FIG. 4(c) is a top cross-sectional view.

Fig. 5 is a three-dimensional view of an integrated high-efficiency condensing gas-fired water heater using a ridge-type exhaust port isobaric fume hood 3, wherein Fig. 5(a) is a front view, Fig. 5(b) is a half-section view, Fig. 5( c) is a top cross-sectional view, and Figure 5(d) is a schematic diagram of a ridge-type exhaust port.

Fig. 6 is a three-dimensional view of an integrated high-efficiency condensing gas-fired water heater with multi-stage spraying, wherein Fig. 6(a) is a front view, Fig. 6(b) is a half-section view, and Fig. 6(c) is a top view Sectional drawing.

Fig. 7 is a three-dimensional view of an integrated high-efficiency condensing gas-fired water heater in the form of inverted spray, wherein Fig. 7(a) is a front view, and Fig. 7(b) is a half-section view.

Fig. 8 is a three-dimensional view of an integrated high-efficiency condensing gas-fired water heater combined with overhead and inverted spray, wherein Fig. 8(a) is a front view, and Fig. 8(b) is a half-section view.

Figure 9 is a detailed view of the sprinkler system, wherein the cross-sections of the annular pipes 43 in Figures 9(1a), 9(2a), 9(3a) and 9(4a) are waist circular, square, circular and elliptical, respectively. Schematic diagram of the arrangement of stage or multistage atomizing nozzles 44, Figures 9(1b), 9(2b), 9(3b) and 9(4b) respectively show that the atomizing nozzles 44 are waist circular, square, circular and oval in appearance Schematic diagram, FIG. 9( c ) is a schematic diagram of the angle formed by the atomizing nozzle 44 and the vertical direction.

Fig. 10 is a schematic diagram of various appearances of the burner 1, wherein Fig. 10(a), Fig. 10(b) and Fig. 10(c) are respectively circular, waist circular and oval.

11 is a schematic diagram of a high-efficiency condensing gas-fired water heater with integrated indirect and direct contact heat exchange arranged on the left and right sides.

12 is a schematic diagram of a high-efficiency condensing gas-fired water heater with integrated indirect and direct contact heat exchange arranged up and down.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment, the present invention is described in further detail:

Example 1

As shown in Figure 2(a) and Figure 2(b) in Figure 2, a high-efficiency condensing gas-fired water heater with mixed heat exchange of the present invention includes a burner 1 that burns to generate high-temperature flue gas, and wraps the burner 1 to absorb The heat exchanger 2 for high temperature flue gas heat, the spray system (4) arranged on the heat exchanger (2), the spray system (4) is isolated from the heat exchanger (2) and the spray system (4) is installed in the heat exchanger (2) An isobaric fume hood (3) whose outer wall forms an isobaric flue gas channel, and a casing (5) covering the burner (1), the heat exchanger (2), the isobaric fume hood (3) and the spray system (4) , the chimney (6) arranged on the shell (5); the low-temperature flue gas after heat release by the heat exchanger (2) passes through the channel between the shell 5 and the isobaric fume hood 3 and is further absorbed by the spray system 4 sensible heat and The latent heat is finally discharged from the chimney 6 .

The heat exchanger 2 includes a heat exchanger main body 21, a heat exchanger water inlet 22 and a heat exchanger water outlet 23 communicated with the heat exchanger main body (21).

The isobaric fume hood 3 includes a cover plate 31 and a low-temperature flue gas outlet 32 located at the bottom end of the isobaric fume hood 3 .

The spray system 4 includes a spray liquid inlet 41 at the top of the casing 5, a flow equalizing pipe 42 connecting the spray liquid inlet 41 and the ring pipe 43, and an atomizing nozzle 44 at the bottom end of the ring pipe 43. The upper ring pipe 43 is located between the equalizing pipe 42 and the cover plate 31 , and the ring pipe 43 and the equalizing pipe 42 form an included angle of 90° to 120°.

The casing 5 includes a chimney connection channel 51 at the top of the casing 5 and a dew plate 52 at the bottom.

The heat exchanger main body 21 controls the wall temperature to be higher than 60°C under any working condition, preferably the exhaust gas temperature is controlled to be around 200°C under any working condition, so that no condensed water is generated on the heat exchanger wall.

The heat exchanger main body 21 does not produce condensed water under any working conditions and will not cause problems such as condensed water corrosion. A copper finned tube heat exchanger with a water collecting tray structure is used to form a four-return water working medium. runner.

The heat exchanger water inlet 22 and the heat exchanger water outlet 23 are arranged at the bottom of the copper finned tube heat exchanger with a water collecting pan structure, and are connected to the water collecting pan at the bottom of the heat exchanger.

The angle formed between the isobaric fume hood 3 and the vertical direction can make the flow of flue gas under the rated load at the same pressure pass through the flue gas isobaric passage between the isobaric fume hood 3 and the heat exchanger main body 21, so as to ensure the heat exchanger main body The high temperature flue gas in 21 exchanges heat evenly, and the cover plate 31 is designed to be top, bottom or top and bottom double arrangement according to the arrangement of the heat exchanger water inlet 22 and the heat exchanger water outlet 23 to ensure that the heat exchanger 2 can be placed in the In the isobaric fume hood 3, the low-temperature fume outlet 32 at the bottom of the isobaric fume hood 3 is a uniform 18 annular openings with spokes between them to strengthen the structural strength. The low-temperature fume outlet 32 is located in the plane and horizontal direction. The included angle is 45°.

The isobaric fume hood 3 is independently manufactured, and is made of plastic, stainless steel or glass fiber reinforced plastic with low heat transfer coefficient and temperature resistance to prevent the heat exchange between the spray liquid and the low-temperature flue gas to cause condensation water on the inner wall of the isobaric fume hood 3.

The spray liquid inlet 41 at the top of the casing 5 is arranged on the central axis of the water heater, and there are three equalizing pipes 42 connected between the ring pipe 43 and the spray liquid inlet 41, so that the spray liquid can be evenly sprayed from the water. The spray liquid inlet 41 flows into the ring pipe 43 , and the spray liquid is atomized and sprayed by the 18 atomizing nozzles 44 located at the bottom end of the equalizing pipe 42 .

The condensed water discharge port 45 is located at the bottom end of the casing 5, and its U-shaped structure enables the dew plate 52 to accumulate a certain liquid level, and the condensed water generated during the continuous operation of the water heater is discharged from the condensed water discharge port 45, and the spray liquid is discharged. The outlet 46 is used to discharge the circulating spray liquid, which is also located at the bottom end of the casing 5 but higher than the condensed water discharge port 45. The circulating spray liquid adopts a safe, non-toxic, good thermal conductivity, low viscosity and hydrophobic organic solution.

The casing 5 is made of stainless steel, cast aluminum silicon or plastic material that is resistant to condensation water corrosion, and the exposed plate 52 has a certain height to accommodate the circulating spray liquid and the condensed water, and at the same time, the circulating spray liquid can be made of heat-conducting oil or other safe and non-toxic materials. Poisonous, good thermal conductivity, low viscosity and hydrophobic organic solution and condensed water liquid, so that the condensed water and the circulating spray liquid are discharged from the bottom condensate water discharge port 45 and the spray liquid outlet 46 respectively.

As shown in FIG. 1 , an efficiency-enhancing and energy-saving system for a high-efficiency condensing gas-fired water heater with mixed heat exchange includes a heat pump system 7, a plate heat exchanger 8, a valve group 9, and the above-mentioned high-efficiency condensing heat exchanger with mixed heat exchange. Gas-fired water heater, the heat exchanger 2 and the condenser 72 in the heat pump system 7 constitute the main heat exchange subsystem, and the connection mode of the main heat exchange subsystem is: the water outlet 23 of the heat exchanger and the inlet of the plate heat exchanger 8 , The outlet of the plate heat exchanger 8—the inlet of the condenser 72, the outlet of the condenser 72, and the water inlet 22 of the heat exchanger are connected in sequence, and the spray system 4 and the evaporator 71 in the heat pump system 7 constitute a secondary spray heat exchanger. The connection method of the secondary spray heat exchange subsystem is as follows: the spray liquid outlet 46, the evaporator 71 inlet, the evaporator 71 outlet, and the spray liquid inlet 41 are connected in sequence; the evaporator 71 in the heat pump system 7 and the The inlet and outlet pipes of the condenser 72 are installed with valves 91 to form a valve group 9, and a short-circuit valve 92 is installed on the inlet and outlet short-circuit pipes of the condenser 72. When the heat pump system 7 is activated, the short-circuit valve 92 is closed, and the valve group 9 is in the All valves 91 are open, and when the heat pump system is turned off, all valves 91 in the valve group 9 are closed. The parallel connection of the heat pump system 7 can reduce the temperature of the circulating spray liquid, further strengthen the condensation heat transfer efficiency of the low-temperature flue gas, increase the return water temperature of the water inlet 22 of the heat exchanger, make the water heater and the heat pump efficient coupling, and effectively improve the overall system operation efficiency , and reduce the sensitivity of load return water temperature fluctuations to operating efficiency.

Implementation case two

In the present embodiment, the same symbols are given to the same structures as those in the first embodiment, and the same descriptions are omitted.

As shown in Figure 3(a) and Figure 3(b) in Figure 3, the isobaric fume hood 3 is connected to the housing 5, and the isobaric fume hood 3 and the housing 5 can be integrated by injection molding process or cast iron or aluminum alloy The molding is convenient for the installation of the heat exchanger 2 and the arrangement of the water inlet 22 of the heat exchanger and the water outlet 23 of the heat exchanger.

Implementation case three

In the present embodiment, the same symbols are given to the same structures as those in the first embodiment, and the same descriptions are omitted.

As shown in FIG. 4(a), FIG. 4(b) and FIG. 4(c), the spray liquid inlet 41 is arranged on the peripheral side of the outer casing 5, and adopts a single-side or double-side liquid inlet method. The high-pressure flow-equalizing spray method is adopted to cancel the structure of the flow-equalizing pipe 42, simplify the manufacturing process and ensure the structural strength.

Implementation case four

In the present embodiment, the same symbols are given to the same structures as those in the first embodiment, and the same descriptions are omitted.

As shown in Fig. 5(a), Fig. 5(b), Fig. 5(c) and Fig. 5(d), the isobaric fume hood 3 is placed vertically, and the surface of the isobaric fume hood 3 has a uniform surface. The ridge-type exhaust port makes the low-temperature flue gas uniformly discharged in the circumferential direction, and at the same time can effectively isolate the condensed water, the circulating spray liquid and the circulating spray liquid. to make.

Implementation case five

In the present embodiment, the same symbols are given to the same structures as those in the first embodiment, and the same descriptions are omitted.

As shown in FIG. 6(a), FIG. 6(b) and FIG. 6(c), the spraying system 4 includes 2-6 stages of loop pipes 43, and the water heater is improved by optimizing the heat exchange by using graded spraying. overall operating efficiency.

Implementation Case 6

In the present embodiment, the same symbols are given to the same structures as those in the first embodiment, and the same descriptions are omitted.

As shown in FIGS. 7(a) and 7(b) in FIG. 7 , the spraying system 4 adopts an integral inverted spraying form, and can also be used as shown in FIGS. 8(a) and 8(b) in FIG. 8 . Shown in the form of a top and bottom sprinkler system 4 arranged on both sides.

Implementation case seven

In the present embodiment, the same symbols are given to the same structures as those in the first embodiment, and the same descriptions are omitted.

As shown in FIG. 9, as shown in FIGS. 9(1a), 9(2a), 9(3a) and 9(4a), the cross-section of the annular tube 43 may be a waist circle, a square, a circle or an ellipse, and One to four single-stage or multi-stage atomizing nozzles 44 may be arranged on the cross section of the ring pipe 43 at the same time, as shown in Figures 9(1b), 9(2b), 9(3b) and 9(4b). The cross section of the atomizing nozzle 44 can be a waist circle, a square, a circle or an ellipse. As shown in FIG. 9( c ), the atomizing nozzle 44 forms an angle θ with the vertical direction of 0-90°.

Implementation case eight

In the present embodiment, the same symbols are given to the same structures as those in the first embodiment, and the same descriptions are omitted.

As shown in FIG. 10(a), FIG. 10(b) and FIG. 10(c), the cross-sectional shape of the burner 1 may be a circle, a waist circle or an ellipse, and the burner 1 is arranged in a The overall centerline of the water heater can also be offset to optimize flue gas flow and reduce flow resistance.

Implementation case nine

In the present embodiment, the same symbols are given to the same structures as those in the first embodiment, and the same descriptions are omitted.

As shown in FIG. 11 , the burner 1 is placed on one side of the casing 5 , and the burner 1 , the heat exchanger 2 , and the spray system 4 are arranged in the left-right or front-rear direction.

Implementation case ten

In the present embodiment, the same symbols are given to the same structures as those in the first embodiment, and the same descriptions are omitted.

As shown in FIG. 12 , the burner 1 is placed on the top of the casing 5 , and the burner 1 , the heat exchanger 2 , and the spray system 4 are arranged from top to bottom.

Claims (10)

1. The utility model provides a high-efficient condensation gas water heater of mixed heat exchange which characterized in that: the device comprises a combustor (1) for generating high-temperature flue gas through combustion, a heat exchanger (2) for absorbing heat of the high-temperature flue gas, an isobaric smoke hood (3) for isolating a spray system (4) from the heat exchanger (2) and forming a flue gas isobaric channel on the outer wall of the heat exchanger (2), a shell (5) for coating the combustor (1), the heat exchanger (2), the isobaric smoke hood (3) and the spray system (4), and a chimney (6) arranged on the shell (5); the low-temperature flue gas released by the heat exchanger (2) is further absorbed by a spraying system (4) through a channel between the shell (5) and the isobaric smoke hood (3) to absorb sensible heat and latent heat and is finally discharged from a chimney (6);

the cross section of the burner (1) is circular, oval or elliptical, and is arranged on the central line of the whole hot water furnace or is offset from the central line of the whole hot water furnace so as to optimize the flow of smoke and reduce the flow resistance;

the heat exchanger (2) comprises a heat exchanger main body (21), a heat exchanger water inlet (22) and a heat exchanger water outlet (23) which are communicated with the heat exchanger main body (21);

the isobaric smoke hood (3) comprises a cover plate (31) and a low-temperature smoke outlet (32);

the spraying system (4) comprises a spraying liquid inlet (41) positioned at the top end of the shell (5) or on the peripheral side of the shell (5), when the spraying liquid inlet (41) is positioned at the top end of the shell (5), the spraying system comprises a flow equalizing pipe (42) for connecting the spraying liquid inlet (41) and a ring pipe (43), the ring pipe (43) is positioned between the flow equalizing pipe (42) and the cover plate (31) in the vertical direction, and the ring pipe (43) and the flow equalizing pipe (42) form an included angle of 90-120 degrees, when the spraying liquid inlet (41) is positioned on the peripheral side of the shell (5), a high-pressure flow equalizing spraying mode is adopted to eliminate the structure of the flow equalizing pipe (42), the manufacturing process is simplified, the structural strength is ensured, and the ring pipe (; the atomizing nozzle (44) is positioned at the bottom end of the ring pipe (43), and the condensed water outlet (45) and the spraying liquid outlet (46) are positioned at the bottom end of the shell (5);

the top in the shell (5) is provided with a chimney connecting channel (51), and the bottom is provided with a dew presenting disc (52).

2. The hybrid heat exchange high-efficiency condensing gas water heater according to claim 1, wherein: the wall temperature of the heat exchanger main body (21) is controlled to be higher than 60 ℃ under any working condition, the exhaust gas temperature is controlled to be 110-260 ℃, so that no condensate water is generated on the wall surface of the heat exchanger, and the problem of condensate water corrosion is solved, and the heat exchanger main body (21) is made of cast aluminum, cast iron, carbon steel, welded stainless steel, copper or copper fin tubes.

3. The hybrid heat exchange high-efficiency condensing gas water heater according to claim 1, wherein: the heat exchanger water inlet (22) and the heat exchanger water outlet (23) are arranged at the bottom of the heat exchanger main body (21) or are respectively arranged at the bottom or the top according to different types of the heat exchanger main body (21).

4. The hybrid heat exchange high-efficiency condensing gas water heater according to claim 1, wherein: the isobaric smoke hood (3) is manufactured independently or integrally formed with the shell (5), the isobaric smoke hood (3) forms a preset angle with the vertical direction when a low-temperature smoke outlet (32) at the bottom is adopted, or is vertically arranged when the surface of the isobaric smoke hood (3) is provided with an even ridge type exhaust port, smoke isobaric flow of the smoke under rated load can pass through a smoke isobaric channel between the isobaric smoke hood (3) and the heat exchanger main body (21), uniform heat exchange of high-temperature smoke in the heat exchanger main body (21) is ensured, a cover plate (31) of the isobaric smoke hood (3) is designed to be doubly arranged at the top, the bottom or the top and the bottom according to the arrangement mode of a heat exchanger water inlet (22) and a heat exchanger water outlet (23) so as to ensure that the heat exchanger (2) can be placed in the isobaric smoke hood (3), and the low-temperature smoke outlet (32) at the bottom of, have the spoke between two liang, strengthen structural strength, low temperature exhanst gas outlet (32) place plane and horizontal direction contained angle are 0 ~ 60, when isobaric petticoat pipe (3) and shell (5) integrated into one piece were made, top apron (31) had low temperature exhanst gas outlet (32) structure concurrently.

5. The hybrid heat exchange high-efficiency condensing gas water heater according to claim 1, wherein: the isobaric smoke hood (3) is of a single-layer or double-layer structure, cast aluminum, cast iron, stainless steel or plastic and glass fiber reinforced plastic materials with low heat conductivity coefficient and temperature resistance are adopted, and both the single-layer low heat conductivity coefficient material and the double-layer structure can prevent low-temperature spray liquid from contacting the outer wall of the isobaric smoke hood (3) and low-temperature smoke from an isobaric channel between the isobaric smoke hood (3) and the heat exchanger main body (21) to exchange heat so as to enable the inner wall of the isobaric smoke hood (3) to generate condensed water.

6. The hybrid heat exchange high-efficiency condensing gas water heater according to claim 1, wherein: when the spraying liquid inlet (41) is positioned at the top end of the shell (5), 3-9 flow equalizing pipes (42) are arranged between the spraying liquid inlet (41) and the circular pipe (43) to be connected, so that spraying liquid uniformly flows into the circular pipe (43) from the spraying liquid inlet (41), the cross section of the circular pipe (43) is in a waist-round shape, a square shape, a round shape or an oval shape, 6-18 atomizing nozzles (44) are arranged on the circular pipe (43) in the circumferential direction, 1-4 atomizing nozzles (44) are arranged on the circular pipe in the radial direction, the cross section of each atomizing nozzle (44) is in a waist-round shape, a square shape, a round shape or an oval shape, and an angle theta is 0-90 degrees with the vertical direction, the circular pipe (43) adopts a single circular pipe or multiple circular pipes to form a single-stage overhead spraying system (4), and the spraying system (4).

7. The hybrid heat exchange high-efficiency condensing gas water heater according to claim 1, wherein: the condensation water outlet (45) is of a U-shaped structure, so that the exposure disc (52) can accumulate a certain liquid level, condensation water generated in the continuous operation of the water heater is discharged from the condensation water outlet (45), the spraying liquid outlet (46) is used for discharging circulating spraying liquid, the circulating spraying liquid is also positioned at the bottom end of the shell (5) but is higher than the condensation water outlet (45), and the circulating spraying liquid adopts a safe, non-toxic, organic working medium or a water working medium with good thermal conductivity, low viscosity and hydrophobicity.

8. The hybrid heat exchange high-efficiency condensing gas water heater according to claim 1, wherein: the shell (5) is made of stainless steel, cast aluminum silicon or plastic materials resistant to condensate water corrosion, the exposure disc (52) has a certain height to contain circulating spray liquid and condensate water, and meanwhile, the circulating spray liquid is separated from the condensate water by using a safe, non-toxic, good-heat-conductivity, low-viscosity and hydrophobic organic working medium, so that the condensate water and the circulating spray liquid are discharged from a condensate water outlet (45) and a spray liquid outlet (46) at the bottom respectively.

9. The hybrid heat exchange high-efficiency condensing gas water heater according to claim 1, wherein: according to the position relation of the heat exchanger (2) and the spraying system (4), the arrangement form of the water heater is in a surrounding arrangement form, a left-right arrangement form or an up-down arrangement form.

10. The energy-saving system for the high-efficiency condensing gas water heater using the mixed heat exchange of any one of claims 1 to 8, is characterized in that: the high-efficiency condensation gas water heater comprises a heat pump system (7), a plate type heat exchanger (8), a valve bank (9) and the high-efficiency condensation gas water heater with mixed heat exchange as claimed in any one of claims 1 to 8, wherein the heat exchanger (2) and a condenser (72) in the heat pump system (7) form a main body heat exchange subsystem, and the main body heat exchange subsystem is connected in a way that: the heat exchanger water outlet (23), the plate heat exchanger (8) import, the plate heat exchanger (8) export-condenser (72) import, condenser (72) export, heat exchanger water inlet (22) connect gradually, evaporimeter (71) in sprinkling system (4) and the heat pump system (7) constitute secondary and spray the heat transfer subsystem, and the connected mode that secondary sprayed the heat transfer subsystem is: the spraying liquid outlet (46), the evaporator (71) inlet, the evaporator (71) outlet and the spraying liquid inlet (41) are connected in sequence; the inlet and outlet pipelines of the evaporator (71) and the condenser (72) in the heat pump system (7) are respectively provided with a valve (91) to form a valve group (9), the inlet and outlet short-circuit pipelines of the condenser (72) are provided with a short-circuit valve (92), when the heat pump system (7) is started, the short-circuit valves (92) are closed, all the valves (91) in the valve group (9) are opened, and when the heat pump system is closed, all the valves (91) in the valve group (9) are closed.

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