Premixed water cooling gas vacuum phase change hot water boiler

Abstract

The utility model discloses a premixing water-cooling gas vacuum phase change hot water boiler which comprises a front premixing fan, a combustion furnace, a water-cooling combustor and the like, the water-cooling combustor comprises a water-cooling fire row tube bundle, an upper header is arranged at the top of the combustion furnace, and a lower header is arranged at the bottom of the combustion furnace. The water-cooling fire grate tube bundle and the convection heat exchange tube bundle are communicated with the upper header and the lower header; a front water chamber and a rear water chamber are arranged on two sides of the upper header, a tube pass heat exchange tube bundle is arranged in the upper header, a water inlet tube seat and a water outlet tube seat are arranged on the front water chamber or the rear water chamber, or the front water chamber or the rear water chamber is provided with the water inlet tube seat, and the rear water chamber or the front water chamber is correspondingly provided with the water outlet tube seat. The water inlet end of the tube pass return tube is communicated with the front water chamber or the rear water chamber, and the water outlet end of the tube pass return tube bundle is communicated with the front water chamber or the rear water chamber. The burner is long in service life, small in high-temperature smoke resistance and airflow reflection, more environment-friendly in smoke exhaust and lower in temperature.

Description

Technical Field

[0001] The utility model relates to a hot water boiler, in particular to a premixed water-cooled gas vacuum phase-change hot water boiler. Background Art

[0002] The full name of vacuum boiler is vacuum phase change boiler. Vacuum boiler forms a negative pressure vacuum environment inside the closed furnace body, fills the body with heat medium water, heats the heat medium by combustion or other means, and then evaporates and condenses on the heat exchanger, and then the heat exchanger heats the water to be heated. Vacuum boiler The lower half of the vacuum hot water boiler is equipped with heat medium, and the upper part is a vacuum chamber with a U-shaped or straight tube heat exchanger inserted. Vacuum boilers are mainly classified according to fuel. It can be divided into electric heating vacuum boilers, oil-fired vacuum boilers, gas-fired vacuum boilers, coal-fired vacuum boilers, etc.

[0003] The Chinese patent with application publication number CN116294216A and application publication date June 23, 2023 discloses a coupled fin tube gas vacuum phase change hot water boiler, which adopts a horizontal arrangement, and the burner outlet is connected to the furnace enclosed space, and the membrane water-cooled wall evaporation heat exchange tube bundle is located in front and behind the furnace enclosed space, and the coupled fin tube evaporation heat exchange tube bundle is located on both sides of the furnace enclosed space, and the upper steam-water chamber and the lower water chamber are respectively located above and below the furnace enclosed space; the coupled fin tube flue gas condenser heat exchange tube bundle and the chimney are arranged behind the furnace along the flue gas flow direction; the coupled fin tube evaporation heat exchange tube bundle and the coupled fin tube flue gas condenser heat exchange tube bundle adopt gap heat exchange tube bundle. The coupled fin tube gas vacuum phase change hot water boiler has the following defects: (1) The air-cooled flat burner has no water cooling method, and the flame burns directly on the metal surface of the air-cooled burner, which can easily cause deformation or even burning of the metal surface; (2) The high-temperature flue gas resistance and airflow reflection generated are large, causing large boiler noise and vibration; (3) The exhaust gas temperature is high. Utility Model Content

[0004] The utility model aims to solve the above problems existing in the coupled fin tube gas vacuum phase change hot water boiler in the prior art, and provides a premixed water-cooled gas vacuum phase change hot water boiler with a long burner service life, small high-temperature flue gas resistance and airflow reflection, and low exhaust temperature.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a premixed water-cooled gas vacuum phase-change hot water boiler of the utility model comprises a combustion furnace, an economizer and a smoke box connected in sequence, a front premixing fan is arranged on the outer side of the closed end of the combustion furnace, a water-cooled burner and a convection heat exchange tube bundle are arranged in sequence in the combustion furnace along the flow direction of the high-temperature flue gas, the water-cooled burner comprises a water-cooled fire row tube bundle, the enclosed space between the water-cooled fire row tube bundle and the closed end of the combustion furnace forms an air distribution chamber, the outlet of the front premixing fan is connected to the air distribution chamber, the enclosed space between the water-cooled fire row tube bundle and the convection heat exchange tube bundle forms a combustion furnace cavity, the top of the combustion furnace is provided with an upper header with an internal vacuum, the bottom of the combustion furnace is provided with a lower header with an internal vacuum, the water-cooled fire row tube bundle The upper end of the tube bundle and the upper end of the convection heat exchange tube bundle are both connected to the upper header, and the lower end of the water-cooled fire row tube bundle and the lower end of the convection heat exchange tube bundle are both connected to the lower header; the upper header is provided with a front water chamber and a rear water chamber on both sides, and a tube-side heat exchange tube bundle is provided in the upper header, and an inlet pipe seat and an outlet pipe seat are provided on the front water chamber or the rear water chamber according to the tube-side water flow direction in the tube-side heat exchange tube bundle, or the front water chamber or the rear water chamber is provided with an inlet pipe seat according to the tube-side water flow direction in the tube-side heat exchange tube bundle, and the rear water chamber or the front water chamber is correspondingly provided with an outlet pipe seat; a tube-side return pipe is provided in the economizer, and the water inlet end of the tube-side return pipe is connected to the front water chamber or the rear water chamber on which the water inlet pipe seat is provided, and the water outlet end of the tube-side return tube bundle is connected to the front water chamber or the rear water chamber on which the water outlet pipe seat is provided.The upper header and the lower header in the utility model are separated by the combustion furnace, and the lower header is mainly used to collect condensed heat medium. The heat medium in the convection heat exchange tube bundle is heated and then rises. The steam generated in the vacuum state exchanges heat with the tube-side heat exchange tube bundle in the upper header. The tube-side water in the tube-side heat exchange tube bundle is heated and then discharged for use, and the heat medium condensed after the heat exchange falls back into the lower header through the water-cooled fire row tube bundle, thereby forming a separate cycle; the combustion furnace, the economizer, the smoke box, the front premixing fan and the water-cooled burner are all conventional structures in the art Structure; The utility model adopts full premixed water-cooled combustion technology. After premixing and gas separation, the gas is ignited and directly burns at low temperature on the surface of the water-cooled fire row tube bundle. The combustion is more stable, which is beneficial to prolonging the service life of the burner and achieving ultra-low nitrogen emissions. The combustion furnace, economizer and smoke box are designed as an integrated whole, interconnected, not external, compact in structure, and have small resistance to high-temperature flue gas and airflow reflection, small boiler noise and vibration; the upper header and the lower header can adopt a square structure, which is consistent with the outer shell of the combustion furnace; the water in the pipe process of the water inlet is divided into two ways, one of which enters through the water inlet pipe seat The inlet heat exchange tube bundle exchanges heat with the heat medium steam, and the other way enters the tube return tube in the economizer through the water inlet pipe seat to cool the high-temperature flue gas and reduce the exhaust temperature. The two tube waters are finally merged and discharged through the outlet pipe seat; the front water chamber and the rear water chamber play the role of collecting water. The internal structure of the front water chamber and the rear water chamber can be set according to the tube water flow direction in the tube heat exchange tube bundle, and the inlet pipe seat and the outlet pipe seat can be set according to the tube water flow direction in the tube heat exchange tube bundle, that is, the inlet pipe seat and the outlet pipe seat can be set on the front water chamber or the rear water chamber at the same time. , or they can be respectively arranged on the front water chamber and the rear water chamber, or respectively arranged on the rear water chamber and the front water chamber, that is, the arrangement positions of the outlet pipe seat and the inlet pipe seat and the specific structures of the front water chamber and the rear water chamber can be arranged according to the tube-side water flow direction in the tube-side heat exchange tube bundle; in addition, the arrangement positions and numbers of the outlet pipe seat and the inlet pipe seat / the number of the tube-side heat exchange tube bundles / the specific structures of the front water chamber and the rear water chamber / the tube-side water flow direction in the tube-side heat exchange tube bundle in the utility model can be adaptively adjusted and designed according to the specifications and models of the boiler (single effect or multi-effect).

[0006] Preferably, the gas separation chamber is provided with a gas separation plate and a uniform gas plate, and the uniform gas plate is located in front of the gas separation plate. The gas separation plate and the uniform gas plate are both porous plates, and the gas separation plate and the uniform gas plate can make the gas discharge and combustion more uniform.

[0007] Preferably, the water-cooled fire row tube bundle includes a plurality of guide edge fin tubes arranged at intervals, the gaps between the fins on the same guide edge fin tube form a gas channel, a flame stabilizing light tube is arranged behind the gaps between adjacent guide edge fin tubes, a gap is arranged between adjacent guide edge fin tubes, and the surface of the flame stabilizing light tube forms a combustion surface. The guide edge fin tube is a conventional structure in the art, and the shape of the fin can be selected according to the guide edge, and circular fins or special-shaped fins can be selected; the flame burns evenly on the surface of the flame stabilizing light tube.

[0008] Preferably, a plurality of spaced supporting circular tubes are provided between the air distribution plate and the guide edge fin tube, and the supporting circular tubes are fixedly connected to the guide edge fin tube and the air distribution chamber. The guide edge fin tubes are separated by supporting circular tubes, which not only makes the gas entering between the fins of the guide edge fin tube more uniform, but also supports the air distribution plate to prevent the air distribution plate from vibrating due to the airflow of the fan and causing abnormal noise.

[0009] Preferably, the convection heat exchange tube bundle includes a convection heat exchange fin tube bundle and a convection heat exchange light tube bundle, and the convection heat exchange fin tube bundle is located in front of the convection heat exchange light tube bundle. The design of the front row convection heat exchange fin tube bundle and the rear row convection heat exchange light tube bundle is adopted. The high-temperature flue gas burning in the combustion chamber first passes through the fin tube heat exchange and then passes through the light tube heat exchange. After the first cooling of the high-temperature flue gas, the temperature is not reduced to the temperature at which a large amount of water in the flue gas condenses, and no condensed water is generated, and the fins of the vertically arranged fin tubes will not be blocked by condensed water, and the flue gas circulation resistance will increase to affect the combustion. After the first convection heat exchange fin tube bundle cooling, it enters the second convection heat exchange light tube bundle cooling. Even if a small amount of condensation is formed, it will flow down with the light tube and enter the condensed water drain pipe together with the flue gas condensed water in the economizer.

[0010] Preferably, the rear water chamber is provided with a rear water chamber transverse partition and a rear water chamber longitudinal partition, and the rear water chamber transverse partition and the rear water chamber longitudinal partition divide the rear water chamber into three independent chambers, namely, the rear lower water chamber, the rear left upper water chamber and the rear right upper water chamber. The front water chamber is provided with a front water chamber longitudinal partition, and the front water chamber longitudinal partition divides the front water chamber into two independent chambers, namely, the front left water chamber and the front right water chamber. The water inlet pipe seat is connected to the rear left upper water chamber, and the water outlet pipe seat is connected to the rear right upper water chamber. The tube-side water in the tube-side heat exchange tube bundle flows back along the tube-side heat exchange tubes in sequence through the rear left upper water chamber, the front right water chamber, the rear lower water chamber, the front left water chamber and the rear right upper water chamber. The tube-side heat exchange tube bundle in the utility model is arranged as a four-pass, and the boiler is a single-effect boiler, so as to extend the heat exchange stroke of the tube-side water in the upper header.

[0011] Preferably, the water inlet end of the tube-side return pipe is connected to the rear upper left water chamber through a connecting pipe, and the water outlet end of the tube-side return pipe is connected to the rear upper right water chamber through a return pipe.

[0012] Therefore, the utility model has the following beneficial effects:

[0013] (1) The combustion method is not easy to be blocked, not easy to burn out and has a long service life;

[0014] (2) High-temperature flue gas resistance and airflow reflection are small, premixed combustion is more complete, combustion efficiency is high, ultra-low nitrogen and low carbon emissions and low exhaust temperature can be easily achieved, there is no need to purchase a burner externally and the manufacturing is simple, which greatly reduces the manufacturing cost;

[0015] (3) Compact structure, small body size and small footprint. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a main view internal structure schematic diagram of the utility model.

[0017] Figure 2 yes Figure 1 Left view schematic diagram of the internal structure.

[0018] Figure 3 yes Figure 1 Schematic diagram of the internal structure viewed from above.

[0019] Figure 4 yes Figure 3 Enlarged view of point A in the middle.

[0020] Figure 5 It is a schematic diagram of the internal structure of the rear water chamber.

[0021] In the figure: combustion furnace 1, economizer 2, smoke box 3, front premix fan 4, convection heat exchange tube bundle 5, water-cooled fire row tube bundle 6, air distribution chamber 7, combustion furnace cavity 8, upper header 9, lower header 10, tube side heat exchange tube bundle 11, front water chamber 12, rear water chamber 13, water inlet pipe seat 14, water outlet pipe seat 15, tube side return pipe 16, air distribution plate 17, uniform air plate 18, finned tube 19, flame stabilizing light tube 20, supporting circular tube 21, convection heat exchange finned tube bundle 22, convection heat exchange light tube bundle 23, rear water chamber transverse partition 24, rear water chamber longitudinal partition 25, rear lower water chamber 26, rear left upper water chamber 27, rear right upper water chamber 28, front water chamber longitudinal partition 29, front left water chamber 30, front right water chamber 31, connecting pipe 32, return pipe 33. DETAILED DESCRIPTION

[0022] The utility model is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0023] like Figure 1 , Figure 2 , Figure 3 A premixed water-cooled gas vacuum phase-change hot water boiler shown in the figure comprises a combustion furnace 1, an economizer 2 and a smoke box 3 connected in sequence, a front premixing fan 4 is arranged outside the closed end of the combustion furnace, a water-cooled burner and a convection heat exchange tube bundle 5 are arranged in sequence along the flow direction of the high-temperature flue gas in the combustion furnace, the water-cooled burner comprises a water-cooled fire row tube bundle 6, and the closed space between the water-cooled fire row tube bundle and the closed end of the combustion furnace forms an air distribution chamber 7, the outlet of the front premixing fan is connected to the air distribution chamber, and an air distribution orifice plate 17 and an air uniforming orifice plate 18 (such as Figure 4As shown in the figure, the uniform air hole plate is located in front of the air hole plate, the water-cooled fire row tube bundle includes a plurality of guide edge fin tubes 19 arranged at intervals, the gaps between the fins on the same guide edge fin tube form a gas channel, a flame stabilizing light tube 20 is arranged behind the gaps between adjacent guide edge fin tubes, a gap is provided between adjacent flame stabilizing light tubes, and the surface of the flame stabilizing light tube forms a combustion surface, a plurality of support circular tubes 21 arranged at intervals are provided between the air hole plate and the fin tube, the support circular tube is fixedly connected to the guide edge fin tube, the closed space between the flame stabilizing light tube and the convection heat exchange tube bundle forms a combustion furnace chamber 8, and the convection heat exchange tube bundle includes convection heat exchange fins. The tube bundle 22 and the convection heat exchange light tube bundle 23, the convection heat exchange finned tube bundle is located in front of the convection heat exchange light tube bundle, the top of the combustion furnace is provided with an upper header 9 with internal vacuum, the bottom of the combustion furnace is provided with a lower header 10 with internal vacuum, the upper end of the water-cooled fire row tube bundle and the upper end of the convection heat exchange tube bundle are both connected to the upper header, and the lower end of the water-cooled fire row tube bundle and the lower end of the convection heat exchange tube bundle are both connected to the lower header; the upper header is provided with a tube-side heat exchange tube bundle 11, and the two sides of the upper header are respectively provided with a front water chamber 12 and a rear water chamber 13, and the rear water chamber is provided with a rear water chamber transverse partition 24 and a rear water chamber longitudinal partition 25 (such as Figure 5 As shown in the figure, the rear water chamber transverse partition and the rear water chamber longitudinal partition divide the rear water chamber into three independent chambers: the rear lower water chamber 26, the rear left upper water chamber 27 and the rear right upper water chamber 28. A front water chamber longitudinal partition 29 is provided in the front water chamber, and the front water chamber longitudinal partition divides the front water chamber into two independent chambers: the front left water chamber 30 and the front right water chamber 31. The tube-side water in the tube-side heat exchange tube bundle passes through the rear left upper water chamber, the front right water chamber, the rear lower water chamber, the front left water chamber and the rear right upper water chamber in sequence along the tube-side heat exchange tubes. The water inlet of the pipe-side return pipe is connected to the rear upper left water chamber through the connecting pipe 32, and the water outlet of the pipe-side return pipe is connected to the rear upper right water chamber through the return pipe 33. A pipe-side return pipe 16 is installed in the economizer, and the water inlet end of the pipe-side return pipe is connected to the rear upper left water chamber through the connecting pipe 32, and the water outlet end of the pipe-side return pipe is connected to the rear upper right water chamber through the return pipe 33. The rear upper left water chamber is connected with an inlet pipe seat 14, and the rear upper right water chamber is connected with an outlet pipe seat 15.

[0024] The operating principle of the utility model is as follows: gas and air are sucked into the venturi of the pre-mixing fan through the front pre-mixing fan for pre-mixing, and then sent to the gas distribution chamber after pre-mixing, and then enter the gas channel through the gap between the supporting circular tubes after being evenly distributed through the uniform air hole plate and the air distribution hole plate, and then enter the gas channel through the gap between the supporting circular tubes after passing through the gap between the flame stabilizing light tubes to be ignited, enter the combustion furnace cavity to burn and form high-temperature flue gas, and the high-temperature flue gas passes through the convection heat exchange tube bundle and the tube return tube, and then enters the smoke box and is discharged into the atmosphere through the chimney; the high-temperature flue gas heats the convection heat exchange tube bundle after passing through the convection heat exchange tube bundle, and the heat medium is heated in the convection heat exchange tube bundle and rises upward to enter the upper header in a vacuum state, and the generated steam rises and exchanges heat with the tube heat exchange tube bundle arranged in the upper header, heating the tube The water in the heat exchange tube bundle of the process automatically falls down after the steam condenses, and the formed condensed water enters the lower header through the water-cooled fire row tube bundle downward and undergoes heating circulation again; the tube-side water is pumped into the upper left water chamber through the water inlet pipe seat by the external circulation pump and is divided into two paths, one path passes through the rear upper left water chamber, the front right water chamber, the rear lower water chamber, the front left water chamber and the rear upper right water chamber in turn for return flow, exchanges heat with the heat medium steam in the upper header and then flows into the rear upper right water chamber, the other path enters the tube-side return pipe in the economizer through the connecting pipe to cool the high-temperature flue gas, and finally returns to the rear upper right water chamber through the return pipe. The two tube-side waters are discharged through the outlet pipe seat after merging in the rear upper right water chamber, and after use, are pumped into the rear upper left water chamber through the water inlet pipe seat again by the external circulation pump for circulating heating.

[0025] The above-described embodiment is only a preferred solution of the present invention and does not limit the present invention in any form. There are other variations and modifications without exceeding the technical solution described in the claims.

Claims

1. A premixed water-cooled gas vacuum phase-change hot water boiler, characterized in that: The invention comprises a combustion furnace (1), an economizer (2) and a smoke box (3) connected in sequence, wherein a front premixing fan (4) is arranged outside the closed end of the combustion furnace, and a water-cooled burner and a convection heat exchange tube bundle (5) are arranged in sequence inside the combustion furnace along the flow direction of the high-temperature smoke, wherein the water-cooled burner comprises a water-cooled fire row tube bundle (6), and the closed space between the water-cooled fire row tube bundle and the closed end of the combustion furnace forms an air distribution chamber (7), the outlet of the front premixing fan is connected to the air distribution chamber, and the closed space between the water-cooled fire row tube bundle and the convection heat exchange tube bundle forms a combustion furnace cavity (8), the top of the combustion furnace is provided with an upper header box (9) with an internal vacuum, and the bottom of the combustion furnace is provided with a lower header box (10) with an internal vacuum, and the upper ends of the water-cooled fire row tube bundle and the upper ends of the convection heat exchange tube bundle are connected to the upper header box. The lower ends of the water-cooled fire row tube bundle and the lower ends of the convection heat exchange tube bundle are both connected to the lower header; the upper header is provided with a front water chamber (12) and a rear water chamber (13) on both sides; a tube-side heat exchange tube bundle (11) is provided in the upper header; an inlet pipe seat (14) and an outlet pipe seat (15) are provided on the front water chamber or the rear water chamber according to the tube-side water flow direction in the tube-side heat exchange tube bundle, or an inlet pipe seat is provided on the front water chamber or the rear water chamber according to the tube-side water flow direction in the tube-side heat exchange tube bundle, and an outlet pipe seat is correspondingly provided on the rear water chamber or the front water chamber; a tube-side return pipe (16) is provided in the economizer; the water inlet end of the tube-side return pipe is connected to the front water chamber or the rear water chamber provided with the water inlet pipe seat, and the water outlet end of the tube-side return pipe is connected to the front water chamber or the rear water chamber provided with the water outlet pipe seat.

2. A premixed water-cooled gas vacuum phase-change hot water boiler according to claim 1, characterized in that: An air separation orifice plate (17) and an air uniformity orifice plate (18) are provided in the air separation chamber, and the air uniformity orifice plate is located in front of the air separation orifice plate.

3. A premixed water-cooled gas vacuum phase-change hot water boiler according to claim 2, characterized in that: The water-cooled fire row tube bundle comprises a plurality of guide edge fin tubes (19) arranged at intervals, the gaps between the fins on the same guide edge fin tube forming a gas channel, a flame stabilizing light tube (20) being arranged behind the gaps between adjacent guide edge fin tubes, a gap being arranged between adjacent flame stabilizing light tubes, and the surface of the flame stabilizing light tube forming a combustion surface.

4. A premixed water-cooled gas vacuum phase-change hot water boiler according to claim 3, characterized in that: A plurality of support circular tubes (21) arranged at intervals are provided between the air distribution hole plate and the guide edge fin tube, and the support circular tube is fixedly connected to the guide edge fin tube and the air distribution chamber.

5. The premixed water-cooled gas vacuum phase-change hot water boiler according to claim 1, characterized in that: The convection heat exchange tube bundle comprises a convection heat exchange fin tube bundle (22) and a convection heat exchange light tube bundle (23), wherein the convection heat exchange fin tube bundle is located in front of the convection heat exchange light tube bundle.

6. A premixed water-cooled gas vacuum phase-change hot water boiler according to claim 1, characterized in that: The rear water chamber is provided with a rear water chamber transverse partition (24) and a rear water chamber longitudinal partition (25), and the rear water chamber transverse partition and the rear water chamber longitudinal partition divide the rear water chamber into three independent chambers, namely, a rear lower water chamber (26), a rear left upper water chamber (27) and a rear right upper water chamber (28). The front water chamber is provided with a front water chamber longitudinal partition (29), and the front water chamber longitudinal partition divides the front water chamber into two independent chambers, namely, a front left water chamber (30) and a front right water chamber (31). The water inlet pipe seat is connected to the rear left upper water chamber, and the water outlet pipe seat is connected to the rear right upper water chamber. The tube-side water in the tube-side heat exchange tube bundle flows back along the tube-side heat exchange tubes in sequence through the rear left upper water chamber, the front right water chamber, the rear lower water chamber, the front left water chamber and the rear right upper water chamber.

7. A premixed water-cooled gas vacuum phase-change hot water boiler according to claim 6, characterized in that: The water inlet end of the pipe-side return pipe is connected to the front water chamber or the rear water chamber on which the water inlet pipe seat is provided through a connecting pipe (32), and the water outlet end of the pipe-side return pipe is connected to the front water chamber or the rear water chamber on which the water outlet pipe seat is provided through a return pipe (33).

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