A single boiler series-connected cast aluminum silicon hot water boiler coupled with premixed water-cooled combustion

Abstract

The present invention discloses a single-boiler series-connected cast aluminum silicon hot water boiler coupled with premixed water-cooled combustion, wherein the main body is formed by replacing three types of non-boiler series connections with an axisymmetric single-boiler, and the upper part is formed by a combustion chamber radiation zone, a middle convection zone and a condensation zone, and a lower special-shaped smoke box. The combustion chamber center of the axisymmetric single-boiler is provided with a ring-shaped, two parallel rising or water-cooling channels arranged on both sides of the furnace top to form a water-cooled combustion head. The mixed gas is ignited and burned after being ejected through the anti-backfire ribs and the flame-stabilizing column arranged thereon. The high-temperature flue gas flushes the pin-fin heating surfaces of the convection zone and the condensation zone downward from the furnace radiation zone in turn, and is collected in the special-shaped smoke box and then turned and discharged upward. The water channel is connected through a built-in header instead of an external one, which reduces the sealing workload, improves production efficiency, and makes the whole more compact. The present invention realizes the integration of water-cooled combustion and water-cooled heat exchange, reduces the temperature of the combustion zone, inhibits the generation of NOx, and further reduces nitrogen oxides.

Description

Technical Field

[0001] The present invention belongs to the field of thermal energy engineering, and specifically relates to a single-boiler series-connected cast aluminum silicon hot water boiler coupled with premixed water-cooled combustion, and is used in the technical field of boiler equipment for improving production efficiency, reducing costs, saving energy and protecting the environment, and improving product quality and reliability. Background Art

[0002] According to the "2020 China Energy and Chemical Industry Development Report", my country's natural gas demand will reach 329 billion cubic meters in 2020, an increase of 8.8% year-on-year. Natural gas has become an important directional energy source for my country's energy structure adjustment and a key alternative energy source for improving the quality of life of residents. Therefore, under the multiple influences of policies such as energy conservation and emission reduction, renewable energy utilization, and "coal to gas", the entire gas heating furnace industry has also ushered in new development opportunities and more intense industry competition. For commercial gas heating furnaces that are gradually used in schools, hotels, hospitals, and communities, how to control costs more effectively and how to save energy and reduce consumption more efficiently are two problems that must be faced in technology and development.

[0003] In terms of cost control, commercial condensing gas heating furnaces are mainly cast aluminum silicon condensing heating furnaces, which have the advantages of high thermal conductivity, easy installation and maintenance, relatively flexible design, and good corrosion resistance, so they occupy a large share in gas heating furnaces. However, most of the cast aluminum silicon condensing heating furnaces on the market now adopt a modular combination structure of 1 front pot, several middle pots and 1 rear pot. The front pot is connected to the burner head, the rear pot seals the flue gas flow and supports the combustion head and tail, and the middle of the front pot and the rear pot are connected in series with 1 to 12 middle pots of the same structure. Therefore, in order to manufacture and produce cast aluminum silicon gas heating furnaces of a certain power range, at least 3 sets of different molds are required to produce the front pot, the middle pot and the rear pot, respectively, resulting in extremely high casting mold costs. Especially for high-power and large-size cast aluminum silicon commercial gas heating furnaces, the weight of each pot is about 70 to 100 kg, and the corresponding mold costs are more expensive. However, the actual production quantity of the front and rear pot plates connected to the burner is generally only 10-20% of the middle pot plate. Therefore, if the relative structural unification of the above three pot plate castings can be achieved and the differences in non-critical details can be blurred, and one single pot plate can simultaneously complete the functions of the above three pot plates with different structures, the casting mold can be reduced to 1 / 3 of the original, thereby effectively reducing production costs, improving production efficiency, reducing scrap rates, and also helping to increase product lines and significantly improve product quality and reliability.

[0004] In terms of energy saving and consumption reduction, since the structure of cast aluminum silicon commercial gas heating furnace is very compact, the current gas burner generally uses a full premixed metal fiber surface burner with a shorter flame length. However, the smaller furnace size makes the volume heat load of the full premixed burner extremely high. Under rated load, nitrogen oxide emissions often exceed 30mg / m3, which cannot meet the requirements of pollutant emission indicators in major cities across the country, and will cause the boiler to operate at a reduced load. However, there are also some difficulties in the surface full premixed combustion technology. On the one hand, as the air-fuel premix ratio increases, the stable combustion range of the flame becomes smaller, which limits the large-scale full premixed burner; on the other hand, since the full premixed combustion has completed precise mixing, the combustion is complete, the combustion speed is fast, and the flame temperature is high, conventional full premixed surface combustion technology often requires a large amount of excess air to cool the combustion zone temperature, thereby reducing the generation of nitrogen oxides during the combustion process. However, the higher excess air coefficient leads to an increase in exhaust heat loss, which directly reduces the thermal efficiency of the boiler.

[0005] In order to improve the problems of high excess air coefficient combustion and easy flashback, domestic and foreign technicians have developed a fully premixed water-cooled combustion technology based on the fully premixed surface combustion technology. The burner head is composed of a water-cooled tube bundle with a high heat transfer coefficient. After premixing, it is sprayed through the narrow slits between the water-cooled tube bundles and then ignited and burned. The water-cooled tube bundle quickly takes away the high temperature generated by the premixed flame at the root of the flame, effectively reducing the temperature of the combustion zone and further inhibiting the generation of thermal NOx. At the same time, the "cold wall effect" of the water-cooled tube bundle plays a flameout protection role, which can effectively reduce the flashback risk of the combustion head. Therefore, the fully premixed water-cooled combustion technology has also become the first choice for many condensing boilers. In addition, almost all cast aluminum silicon condensing gas boilers on the market are equipped with fully premixed metal fiber surface burners. The fan equipped with this burner needs an anti-static fan with low power. If there is a breakthrough in power limit, independent breakthrough in technology, and reduction of dependence on foreign technology, a fully premixed water-cooled burner must also be selected. There is currently no precedent for combining a fully premixed water-cooled burner with cast aluminum silicon, let alone a product that integrates a fully premixed water-cooled burner with cast aluminum silicon. Summary of the invention

[0006] In order to simultaneously achieve the triple goals of cost control, energy conservation and consumption reduction, and reduction of flue gas nitrogen oxide emissions, and to reduce unnecessary investment in the production process of cast aluminum silicon condensing heating water boilers, the present invention organically combines a water-cooled combustion head and an axisymmetric heat exchange boiler plate, thereby providing a single-boiler series-connected cast aluminum silicon water boiler coupled with premixed water-cooled combustion.

[0007] The present invention is achieved through the following technical solutions:

[0008] A single-boiler series-connected cast aluminum silicon hot water boiler coupled with premixed water-cooled combustion, the main structure of which is formed by sealing the front and rear end faces of 2 to 12 axisymmetric single boilers 1 in sequence and then connecting them in series with bolts 4 according to capacity requirements; a front cover plate 5 is arranged at the center of the furnace of the front boiler in the axisymmetric single boiler 1, the front cover plate 5 is connected inwardly to a cylindrical flow-averaging orifice plate 3, and is supported on the annular inner wall surface of an annular water-cooled combustion head 2, the cylindrical flow-averaging orifice plate 3 passes through the annular water-cooled combustion head 2 of each axisymmetric single boiler 1, and the front cover plate 5 is connected outwardly through a connecting elbow 6 is connected to the premixer, and the front and rear pot pin-fin parts of the axisymmetric single pot 1 are arranged with lining insulation cover plates 7; the top and bottom of the front pot are provided with water side header sealing end covers 8, and the center of the furnace of the rear pot is provided with a rear cover plate 12 with a refractory insulation lining, and the bottom and top of the rear pot are respectively provided with a water side inlet header 13 and a water side outlet header 14 for realizing water circulation; on the left and right sides of the main structure, a detachable dust removal baffle 10 and a sand discharge plug 11 are provided; at the bottom of the main structure, a special-shaped smoke box 9 is provided;

[0009] The front and rear sides of the outer part of the axisymmetric single boiler plate 1 are divided into a radiation zone, a convection zone and a condensation zone from top to bottom, wherein an annular water-cooled burner head 2 which is the same as or separated from the axisymmetric single boiler plate 1 is arranged at the center of the combustion chamber of the radiation zone, and the annular water-cooled burner head 2 includes an annular water-cooling channel 101, and the surface of the annular water-cooling channel 101 is provided with anti-flashback ribs 102 and flame-stabilizing columns 103 in a centrally symmetrical form; circular needle ribs 104 and waist-round needle ribs 106 are regularly arranged on the outer side of the combustion chamber of the radiation zone of the axisymmetric single boiler plate 1, the convection zone and the condensation zone; the first bases 108 on both sides of the bottom of the axisymmetric single boiler plate 1 are used to connect with the special-shaped smoke box 9; the gas and air The gas-air mixture enters the cylindrical flow-averaging orifice plate 3 from the connecting elbow 6, flows through the annular water-cooled combustion head 2 after flow averaging, and is uniformly ejected along the annular gaps of adjacent axially symmetrical single boiler plates 1 and then ignited, and burns at axial intervals along the annular cylindrical surface; the high-temperature flue gas fills the radiation area around the furnace of the hot water boiler and then washes downward the pin-fin heating surfaces of the convection area and the condensation area, and flows into the special-shaped smoke box 9 from the bottom end of the main structure formed by 2 to 12 axially symmetrical single boiler plates 1, and the flue gas gathers and turns to be discharged upward; the interior of the axially symmetrical single boiler plate 1 is a hollow cavity, and the return water enters from the first waterway inlet header interface 109 at the bottom and flows out from the first waterway outlet header interface 110 at the top.

[0010] The anti-flashback rib 102 has a corn kernel cross-section structure. After being arranged along the circumference, the spacing between two adjacent anti-flashback ribs 102 is equal along the radial direction, and the spacing is 1 to 10 mm. The height of the anti-flashback rib 102 is 6 to 30 mm, and the specific value should ensure that the average gas ejection speed of the mixed gas when passing through the gap is 2 to 3 m / s; the flame stabilizing column 103 is located on the outside of the anti-flashback rib 102 and is staggered with the anti-flashback rib 102 to stabilize the flame, and the height of the flame stabilizing column 103 is consistent with the anti-flashback rib 102; annular base ribs 113 are arranged around the wall of the combustion chamber in the radiation zone, and 4 to 8 hole seats 111 with threaded holes are evenly arranged on the annular base rib 113. The front and rear pot plates in the axially symmetrical single pot plate 1 are respectively connected to the front cover plate 5 and the rear cover plate 12 through the hole seats 111.

[0011] The circular needle ribs 104 and the waist-round needle ribs 106 of the axisymmetric single pot sheet 1 are arranged in different ways along the flue gas flow direction; the circular needle ribs 104 in the radiation zone are lower in height and have larger diameters and transverse and longitudinal intercepts than those in the convection zone; as the flue gas temperature and radiation amount decrease along the flue gas flow direction, the height of the circular needle ribs 104 gradually increases, and in the convection zone where the flue gas temperature is lower than 500°C, they are arranged in a tightly staggered regular triangle, with the shortest distance between ribs being 3 to 4 mm; in terms of height, the circular needle ribs 104 are of equal height, or are arranged in one or two uniform rows. The ribs are arranged in a high and low staggered design, and the height difference is not more than 1 / 3 of the average height; in the condensation zone where the smoke temperature is lower than 65°C, circular needle ribs 104 and waist-round needle ribs 106 whose long diameter is consistent with the smoke flow direction are used, and the short diameter of the waist-round needle ribs 106 is the same as the diameter of the circular needle ribs 104 in the condensation zone, and the parallel channels between the ribs can provide sufficient heat exchange area for smoke condensation, thereby ensuring the continuous condensation process; the width of the entire condensation zone gradually decreases along the smoke flow direction, so that the outer periphery of the lower half of the entire axisymmetric single boiler plate 1 is in a "∪" shape as a whole.

[0012] The inner hollow cavity of the axisymmetric single boiler plate 1 is a water channel space, which is divided by a longitudinal rib 115 in the vertical direction and a plurality of transverse ribs 116 in the horizontal direction. The longitudinal rib 115 divides the entire water channel space into two parts along the left and right sides. The spacing between each two transverse ribs 116 varies from 40 to 120 mm, and from bottom to top, the longitudinal distance between adjacent transverse ribs 116 decreases layer by layer; the water flows upward along the serpentine bend in the water channel space corresponding to the flue gas condensation zone and the convection zone to the bottom of the radiation zone; the transverse rib 116 at the upper part of the convection zone has an inclination angle of 0 to 10° with the horizontal direction, and a first steam release hole 114 is processed at the end; there are two types of water channel structures corresponding to the radiation zone of the axisymmetric single boiler plate 1: one water channel structure is composed of an annular water cooling channel 101 in the center of the furnace of the radiation zone and the side water channels 112 on the outside of the annular base rib 113, i.e., on both sides of the furnace. Under this structure, the water flow is divided at the bottom of the radiation zone, respectively It rises in parallel along the annular water-cooling channel 101 and the side water channel 112, and finally converges and flows out at the first water channel outlet header interface 110; in another water channel structure, the side water channel 112 of the annular base rib 113 is divided into an ascending water channel 119 and a descending water channel 120 by the dividing rib 118, so the entire water channel structure is composed of the annular water-cooling channel 101, the ascending water channel 119 and the descending water channel 120. Under this structure, the water flow does not split at the bottom of the radiation zone, but flows to the left and right to the two sides of the furnace, turns 90 degrees to enter the ascending water channel 119, and when it goes up to the vicinity of the first water channel outlet header interface 110, it turns inward 180 degrees and goes downward to enter the descending water channel 120, and after reaching the bottom of the furnace, it turns inward 90 degrees and flows to the longitudinal rib 115 of the axisymmetric single boiler plate 1, then turns 90 degrees upward and converges into the annular water-cooling channel 101 to rise, and finally converges and flows out at the first water channel outlet header interface 110.

[0013] Pairs of bolt connection holes 105, cleaning ports 107 and sand discharge ports 117 are arranged on both sides of the axisymmetric single boiler plate 1; the bolt connection holes 105 align the front and rear end surfaces of 2 to 12 axisymmetric single boiler plates 1 and connect them in series and then connect them with bolts 4; the opening of the cleaning port 107 ensures that 1 / 3 to 1 / 2 of the convection zone can be cleaned, avoiding the need to unseal the sealed furnace body when cleaning is required during the heating season, and assembling it with the detachable cleaning baffle 10; the sand discharge port 117 is located opposite to the transverse rib 116, directly penetrates into the waterway in depth, and is assembled with the sand discharge plug 11.

[0014] The front cover plate 5 and the rear cover plate 12 have similar overall structures and are made by a set of molds, and the molding method is casting or stamping; the front cover plate 5 and the rear cover plate 12 are both disc-like structures, and there are circumferential openings 501 at the outer boundaries, which are used to connect with the annular base ribs 113 of the axisymmetric single pot plate 1; four centripetal support ribs 504 are arranged on the inner side of the disc-like structure to support the cylindrical flow-equalizing orifice plate 3; the method of processing the rear cover plate 12 into the front cover plate 5 is specifically as follows: after the rear cover plate 12 is obtained by casting or stamping, the center opening of the rear cover plate 12 is opened to allow the cylindrical flow-equalizing orifice plate 3 to be inserted, and at the same time, a threaded hole 502 is added at the outer end face of the disc-like structure, and an integrated monitoring system 503 including an ignition hole, a flame monitoring hole, and a pressure monitoring hole is processed or added on the outer end surface.

[0015] The axisymmetric single pot plate 1 adopts an integral casting process, and uses ZL101, ZL102, ZL104 or AlSi10Mg grade cast aluminum silicon magnesium alloy. The condensation area of ​​the axisymmetric single pot plate 1 can construct a super-hydrophobic film, which has super-hydrophobicity, self-cleaning and corrosion resistance, so that the flue gas side wall is corrosion-resistant, the heat and mass transfer performance is improved, the surface finish is improved, and dust accumulation is prevented; the cover plate 7 is made of stainless steel and is integrally stamped; the special-shaped smoke box 9 is made of plastic, such as PTFE, PVC, PP or ABS, and is structurally composed of a dew receiving plate 901 and a smoke exhaust outlet 902. The dew receiving plate 901 is a special-shaped polyhedron, and its local cross-sectional area gradually decreases along the length, width and height directions to ensure that there is a lowest point in the structure.

[0016] When the annular water-cooled combustion head 2 and the axisymmetric single boiler plate 1 adopt a split structure, the annular water-cooled combustion head 2 is assembled by a plurality of water-cooled annular cavities 15, an inlet and outlet independent header 16 and a front flange 17; the main structure of the water-cooled annular cavity 15 includes an annular water-cooling channel 1501, anti-flashback fins 1502 and flame-stabilizing ribs 1503; the number of water-cooled annular cavities 15 is the same as the number of axisymmetric single boiler plates 1, and water inlet and outlet holes 1504 are respectively opened on both sides of the annular inner wall surface of the water-cooled annular cavity 15 for docking and assembly with the inlet and outlet independent header 16, thereby realizing independent water circulation inside the split structure; the water-cooled annular cavity 1 matching the front boiler plate of the axisymmetric single boiler plate 1 5 is connected to the front end of the front flange 17, which is used to connect with the front cover plate 5 of the cast aluminum silicon water heater and the connecting elbow 6; at the same time, two arc-shaped equalizing orifice plates 18 are installed on the inner wall of the water-cooled annular cavity 15, and the opening position of the arc-shaped equalizing orifice plates 18 is just opposite to the gap between the anti-flashback fins 1502, and the opening shape is circular, oval or elliptical, and the edges of the two arc-shaped equalizing orifice plates 18 are located on the upper and lower sides of the inlet and outlet independent headers 16; at this time, the mixture of gas and air is fully mixed and firstly flows evenly through the arc-shaped equalizing orifice plates 18, and then passes through the anti-flashback fins 1502 and the flame-stabilizing ribs 1503 between the water-cooled annular cavities 15, and finally is evenly sprayed out and ignited to burn along the circumferential gap intervals of the cylindrical surface.

[0017] When the annular water-cooled combustion head 2 and the axisymmetric cast aluminum silicon single pot plate 1 adopt a split structure, the annular water-cooled combustion head 2 is cast as a whole, and the main body includes an annular water-cooled space 201, an anti-flashback column 202, a flame stabilizing column 203 and a manifold 204; wherein, the anti-flashback column 202 and the flame stabilizing column 203 are evenly distributed on the surface of the annular water-cooled space 201 with central symmetry, and the anti-flashback column 202 has a corn kernel cross-sectional structure. After being arranged along the circumference, it should be ensured that the spacing between the two symmetrical anti-flashback columns 202 is equal everywhere along the radial direction, and the spacing is 1 to 10 mm; the height of the anti-flashback column 202 is 6 to 30 mm, and the specific value should ensure that the average gas ejection speed of the mixed gas when passing through the gap is 2 to 3 m / s; the flame stabilizing column 203 is located on the outside of the anti-flashback column 202 and is staggered with the anti-flashback column 202 to stabilize the flame, and the height of the flame stabilizing column 203 is equal to the height of the anti-flashback column 202. The column 202 remains consistent; the outer cross-sectional shape of the manifold 204 is circular, oblong, elliptical or oval, and the manifold 204 is divided into an inlet pipe 205 and an outlet pipe 206 by the middle rib; after the working water of the annular water-cooled burner head 2 enters from the inlet pipe 205, it is distributed to each annular water-cooled space 201, and after circumferential flow heat exchange, it is collected in the outlet pipe 206 to complete an independent water circulation; at the same time, the inner wall of the annular water-cooled burner head 2 is equipped with an arc-shaped flow equalizing orifice plate 18, and the opening position of the arc-shaped flow equalizing orifice plate 18 is just opposite to the gap of the anti-backfire column 202, and the opening shape is circular, oval or elliptical; at this time, the mixture of gas and air is fully mixed and firstly evenly flows through the arc-shaped flow equalizing orifice plate 18, and then passes through the anti-backfire column 202 and the stable combustion column 203 of the annular water-cooled burner head 2, and finally is evenly sprayed out and ignited to burn along the circumferential gap of the cylindrical surface.

[0018] A single-boiler series-connected cast aluminum silicon hot water boiler coupled with premixed water-cooled combustion, the main structure of which is formed by 2 to 12 axisymmetric boilers 19, the front and rear end faces of which are sealed in sequence and then connected in series with bolts according to the capacity requirements; a front cover plate 22 is arranged in front of the furnace of the front boiler of the axisymmetric boiler 19, which is connected inwardly with a rectangular flow-averaging orifice plate 21 and supported on the inner wall surface of a parallel water-cooled combustion head 20, the rectangular flow-averaging orifice plate 21 passes through the parallel water-cooled combustion head 20 of each axisymmetric boiler 19, and the front cover plate 22 is connected to the premixer outwardly through an elbow 23, and the front and rear boilers in the axisymmetric boiler 19 are connected to the premixer through the elbow 23. The pin-fin part of the plate is arranged with a heat insulation plate 24; in addition, the top and bottom of the front pot plate are provided with an inlet and outlet header sealing end cover 25, and the center of the furnace of the rear pot plate is arranged with a rear end cover plate 29 with a refractory heat insulation lining, and the bottom and top of the rear pot plate are respectively provided with a water inlet main pipe 30-1 and a water outlet main pipe 30-2 for realizing water circulation; on the left and right sides of the main structure, there are ash cleaning baffles 27 and plugs 28; at the bottom of the main structure, there is a smoke box 26; the front and rear sides of the outer side of the axisymmetric pot plate 19 are divided into a radiation zone, a convection zone and a condensation zone from top to bottom, wherein the radiation zone burns A parallel water-cooled combustion head 20 is arranged in the center of the chamber, which is integral with the axisymmetric pot sheet 19. The parallel water-cooled combustion head 20 includes parallel water-cooled channels 1901 on both sides of the central rectangular cross-section cavity 1904. The surface of the parallel water-cooled channel 1901 is provided with anti-tempering ribs 1902 and flame-stabilizing fins 1903 in an axisymmetric form; the outer side of the combustion chamber in the radiation zone of the axisymmetric pot sheet 19, the convection zone and the condensation zone are regularly arranged with circular pin fins 1905 and waist-round pin fins 1907; the bases 1909 on both sides of the bottom of the axisymmetric pot sheet 19 are used to connect with the smoke box 26; the gas and air mixture are discharged from the combustion chamber 1904 to the combustion chamber 1905; the gas and air mixture are discharged from the combustion chamber 1906; the gas and air mixture are discharged from the combustion chamber 1906 to ... The elbow 23 enters the rectangular flow equalizing orifice plate 21, and after equalizing the flow, it is evenly sprayed to both sides along the gap between the boiler plates through the central rectangular cross-section cavity 1904, and then ignites and burns along the plane intervals; the high-temperature flue gas fills the radiation area around the furnace of the hot water boiler and then washes downward the pin-fin heating surfaces of the convection area and the condensation area, and flows into the smoke box 26 from the bottom end of the main structure formed by 2 to 12 axially symmetrical boiler plates 19, and the flue gas gathers and turns to be discharged upward; the interior of the axially symmetrical boiler plate 19 is a hollow cavity, and the return water enters from the waterway inlet interface 1910 at the bottom and flows out from the second waterway outlet header interface 1911 at the top.

[0019] The anti-flashback ribs 1902 and flame-stabilizing wings 1903 are evenly distributed on the surfaces of two parallel water-cooling channels 1901 in an axially symmetrical manner. The anti-flashback ribs 1902 have an oblong or rectangular cross-sectional structure. The spacing between adjacent anti-flashback ribs is 1 to 10 mm, and the height is 6 to 30 mm. The specific values ​​should ensure that the average gas ejection velocity of the mixed gas when passing through the gap is 2 to 3 m / s; the flame-stabilizing wings 1903 are located on the outside of the anti-flashback ribs 1902 and are staggered with the anti-flashback ribs 1902 to stabilize the flame; annular ribs 1913 are arranged around the furnace wall of the radiation zone combustion chamber, and 4 to 8 screw holes 1914 are evenly arranged on the annular ribs 1913. The front and rear pot plates in the axially symmetrical pot plate 19 are respectively connected to the front cover plate 22 and the rear cover plate 29 through the screw holes 1914.

[0020] The circular pin fins 1905 and the waist-round pin fins 1907 of the axisymmetric pot sheet 19 are arranged in different ways along the flue gas flow direction; the circular pin fins 1905 in the radiation zone are lower in height and have larger diameters and horizontal and vertical intercepts than those in the convection zone; as the flue gas temperature and radiation amount decrease along the flue gas flow direction, the height of the circular pin fins 1905 gradually increases, and in the convection zone where the flue gas temperature is lower than 500°C, they are arranged in a tightly staggered regular triangle, with the shortest distance between ribs being 3 to 4 mm; in terms of height, the circular pin fins 1905 are of equal height, or are arranged in one or two uniform rows. The fins are arranged in a group with a staggered design, and the height difference is not more than 1 / 3 of the average height; in the condensation zone where the smoke temperature is lower than 65°C, circular pin fins 1905 and waist-round pin fins 1907 whose long diameter is consistent with the smoke flow direction are used, and the short diameter of the waist-round pin fins 1907 is the same as the diameter of the circular pin fins 1905 in the condensation zone, and the parallel channels between the ribs can provide sufficient heat exchange area for smoke condensation, ensuring the continuous condensation process; the width of the entire condensation zone gradually decreases along the smoke flow direction, so that the outer periphery of the lower half of the entire axisymmetric pot plate 19 is in a "∪" shape as a whole.

[0021] The inner hollow cavity of the axisymmetric boiler plate 19 is a water channel space, which is divided by a longitudinal rib 1916 along the vertical direction and a plurality of transverse ribs 1917 along the horizontal direction. The longitudinal rib 1916 divides the entire water channel space into two parts along the left and right sides. The spacing between each two transverse ribs 1917 varies from 40 to 120 mm, and from bottom to top, the spacing between adjacent transverse ribs 1917 decreases layer by layer. The outer periphery of the radiation zone furnace is an outer water channel 1912; the water flows upward along the serpentine bend in the water channel space corresponding to the flue gas condensation zone and the convection zone to the bottom of the radiation zone, and then splits at the bottom of the radiation zone, and rises in parallel along the parallel water cooling channel 1901 and the outer water channel 1912 respectively, and then converges and flows out at the second water channel outlet header interface 1911; the transverse ribs 1917 at the upper part of the convection zone have an inclination angle of 0 to 10° with the horizontal direction, and a second steam release hole 1915 is processed at the end.

[0022] Pairs of connecting holes 1906, cleaning grooves 1908 and sand discharge holes 1918 are arranged on both sides of the axisymmetric pot plate 19; the connecting holes 1906 align the front and rear end surfaces of 2 to 12 axisymmetric pot plates 19 and connect them in series; the opening of the cleaning grooves 1908 ensures that 1 / 3 to 1 / 2 of the convection zone can be cleaned, avoiding the need to unseal the sealed furnace body when cleaning is required during the heating season, and assembling it with the cleaning baffle 27; the sand discharge holes 1918 are positioned opposite to the transverse ribs 1917, and directly penetrate into the water channel in depth, and are assembled with the plug 28.

[0023] The front end cover plate 22 and the rear end cover plate 29 have similar overall structures and are made by a set of molds, and the molding method is casting or stamping; the front end cover plate 22 and the rear end cover plate 29 are both disc-like structures, and there are circumferential holes 2201 at the outer boundaries, which are used to connect with the annular ribs 1913 of the axisymmetric pot plate 19; reinforcing ribs 2204 are arranged on the inner side of the disc-like structure to support the rectangular flow-equalizing orifice plate 21; the method of processing the rear end cover plate 29 into the front end cover plate 22 is specifically as follows: after the rear end cover plate 29 is obtained by casting or stamping, a rectangular hole is opened at the center of the rear end cover plate 29, and a screw hole 2202 is added at the outer end face of the disc-like structure, and it is positioned on the reinforcing rib 2204, and a monitoring system integrated seat 2203 including an ignition hole, a flame monitoring hole, and a pressure monitoring hole is processed or added on the outer end surface

[0024] A single boiler-series cast aluminum silicon hot water boiler coupled with premixed water-cooled combustion, the main structure of which is formed by 2 to 12 symmetrical single boilers 31, the front and rear end faces of which are sealed in sequence and then connected in series with bolts according to the capacity requirements; isobaric wind bin distributors 32 are installed on both sides of the top of the symmetrical single boiler 31; heat-resistant baffles 33 are arranged on the front and rear boiler pin-fin parts of the symmetrical single boiler 31; in addition, header covers are provided at the top and bottom ends of the front boiler, and a water inlet main pipeline 37-1 and a water outlet main pipeline 37-2 for realizing water circulation are provided at the bottom and top ends of the rear boiler respectively; a dust cleaning cover plate 35 and a sealing plug 36 are provided on the left and right sides of the main structure; a smoke exhaust box 34 is provided at the bottom end of the main structure;

[0025] The front and rear sides of the exterior of the symmetrical single boiler 31 can be divided into a radiation zone, a convection zone and a condensation zone from top to bottom; the gas and air are uniformly and fully mixed in the premixer and then diverted into the isobaric wind bin distributors 32 located on both sides of the top of the furnace of the symmetrical single boiler 31, and after uniform flow, they are uniformly sprayed out along the gaps of each symmetrical single boiler 31 for ignition and combustion; under this structure, the water channels 3101 on both sides of the top of the furnace serve as water-cooled combustion heads, on which anti-flashback fins 3102 and flame stabilizing ribs 3103 are arranged; the outer side of the combustion chamber in the radiation zone, the convection zone and the condensation zone are arranged regularly Circular ribs 3104 and waist-round ribs 3106; the second bases 3108 on both sides of the bottom of the symmetrical single boiler plate 31 are used to connect with the smoke exhaust box 34; the furnace radiation zone becomes the radiation space of the flame, and the high-temperature flue gas fills the furnace radiation zone and then flushes the pin-fin heating surfaces of the convection zone and the condensation zone downward, and flows into the smoke exhaust box 34 from the bottom end of the main structure formed by 2 to 12 symmetrical single boiler plates 31, and the flue gas gathers and turns to be discharged upward; the interior of the symmetrical single boiler plate 31 is a hollow cavity, and the return water enters from the bottom inlet 3109 and flows out from the top outlet 3110.

[0026] The mixed gas flows through the anti-backfire fins 3102 and the flame stabilizing ribs 3103 and then ignites and burns; wherein, the anti-backfire fins 3102 have a rectangular or oblong cross-sectional structure, the spacing between adjacent anti-backfire fins 3102 is 1 to 10 mm, and the height is 6 to 30 mm, and the specific value should ensure that the average gas ejection velocity of the mixed gas when passing through the gap is 2 to 3 m / s; the flame stabilizing ribs 3103 are located on the outside of the anti-backfire fins 3102 and are staggered with the anti-backfire fins 3102 to stabilize the flame, and the height is consistent with the anti-backfire fins 3102; a plurality of support hole seats 3111 with bolt holes are arranged on both sides of the top of the symmetrical single pot plate 31, which are used to connect with the isobaric wind bin distributor 32.

[0027] The circular ribs 3104 and the waist round ribs 3106 of the symmetrical single pot sheet 31 are arranged in different ways along the flue gas flow direction. The circular ribs 3104 in the radiation zone are lower in height and have larger diameters and transverse and longitudinal intercepts than the circular needle ribs in the convection zone. As the flue gas temperature and the radiation amount decrease along the flue gas flow direction, the height of the circular ribs 3104 gradually increases. In the convection zone where the flue gas temperature is lower than 500°C, the circular ribs 3104 are arranged in a tightly staggered regular triangle, and the shortest distance between the circular ribs 3104 is 3 to 4 mm. In terms of height, the circular ribs 3104 are of equal height. , or adopt a uniform staggered design of one row or two rows as a group, and the height difference should not be greater than 1 / 3 of the average height; in the condensation area where the smoke temperature is lower than 65°C, circular ribs 3104 and waist-round ribs 3106 whose long diameter is consistent with the smoke flow direction are adopted, and the short diameter of the waist-round ribs 3106 is the same as the circular ribs 3104 in the condensation area, and the parallel channels between the ribs can provide sufficient heat exchange area for smoke condensation to ensure the continuous condensation process; the width of the condensation area gradually decreases along the smoke flow direction, so that the outer periphery of the lower half of the entire symmetrical single pot plate 31 is in a "∪" shape.

[0028] The inner hollow cavity of the symmetrical single boiler plate 31 is a water channel, which is divided by a central rib 3114 along the vertical direction and a plurality of straight ribs 3115 along the horizontal direction. The central rib 3114 divides the entire water channel space into two parts along the left and right sides. The spacing between each two straight ribs 3115 varies from 40 to 120 mm, and as the overall height increases, the cross-sectional height decreases layer by layer, and ensures that the cross-sectional height around the radiation zone is about 1 / 2 of the maximum cross-sectional height. The central rib 3114 and the straight ribs 3115 form left and right symmetrical serpentine water channels 3112; the straight ribs 3115 at the upper part of the convection zone have an inclination angle of 0 to 10°, and the ends thereof are processed with steam unloading holes 3113; under this structure, after the system return water enters each symmetrical single boiler plate 31, it bends and rises along the left and right symmetrical serpentine water channels 3112, and finally turns to the water channels 3101 on both sides of the top of the furnace until it merges and flows out at the top outlet 3110.

[0029] Pairs of front and rear connecting holes 3105, dust cleaning ports 3107 and cast sand discharge ports 3116 are arranged on both sides of the symmetrical single pot plate 31; the front and rear connecting holes 3105 align the front and rear end surfaces of 2 to 12 symmetrical single pot plates 31 and connect them in series; the opening of the dust cleaning port 3107 ensures that 1 / 3 to 1 / 2 of the convection zone can be cleaned, avoiding the need to unseal the sealed furnace body when dust cleaning is required during the heating season, and assembling it with the dust cleaning cover plate 35; the cast sand discharge port 3116 is positioned opposite to the straight rib 3115, directly penetrates into the waterway in depth, and is assembled with the sealing plug 36.

[0030] Compared with the prior art, the present invention has the following advantages:

[0031] 1. Apply water-cooled premixed combustion technology and single-boiler cascade structure to cast aluminum silicon condensing heating hot water boilers, and produce a design that can simplify casting molds, reduce costs, and improve product quality and reliability; use part of the heat exchange structure of the boiler as the combustion head of the full premixed water-cooled burner, so that the burner and the cast aluminum silicon body heat exchanger are integrated, with a heat exchanger in the burner and a burner in the heat exchanger.

[0032] 2. The present invention is based on the principle of water-cooled premixed combustion. Water-cooling channels are added in different forms in the combustion chamber, which can quickly take away the high temperature of the flame generated by the full premixed burner, thereby effectively suppressing the generation of thermal NOx. Combined with the technical characteristics of the full premixed burner to suppress fuel-type and fast-type NOx, nitrogen oxides can be further reduced.

[0033] 3. The main body of the present invention is symmetrical in structure. Based on a set of symmetrical molds, the traditional cast aluminum silicon condensing heating furnace requires three parts of heating plates, front, middle and back, to form a complete furnace body. This is optimized to only require one universal mold, which not only simplifies the production process, but also effectively controls the casting cost.

[0034] 4. In order to meet the large capacity demand, the present invention adopts the left and right diversion water channel design, so the heat exchange unit is wider, and the maximum capacity of the condensing boiler can be increased by about 30% compared with the traditional design. In addition, for each independent water channel, the working fluid does not drop during the entire flow, which ensures that the molding sand can be poured out and the flow distribution is uniform, while eliminating the heat transfer deterioration caused by supercooled boiling, and solves the corrosion problem caused by the difficulty in removing cold working fluids due to long-term dry protection during the non-heating period. The built-in header instead of the external water tank further simplifies the assembly process, reduces the sealing workload, improves production efficiency, and makes the condensing boiler more compact as a whole.

[0035] 5. The present invention adopts a double "∪"-shaped outlet design with local taper and extended mainstream area on the flue gas convection heating surface, which improves the heat exchange intensity per unit area while ensuring uniform flow rate changes, effectively reduces the redundancy of heat exchange area, and thus reduces the weight and cost of condensing boilers. In addition, the flue gas side adopts a uniform combination of high and low staggered fins in one to three rows as a group, and the downstream waist-round pin fins are mainly used in the rear half of the convection heating surface (condensation heat exchange area). The parallel channels between the two waist-round ribs can provide sufficient and continuous condensation space for the flue gas, so that the condensate can be more easily discharged under the carry-over of the mainstream flue gas, thereby improving the overall heat and mass transfer performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1a This is an axial side view of a single-boiler series-connected cast aluminum silicon hot water boiler coupled with premixed water-cooled combustion according to the present invention.

[0037] Figure 1b The present invention is a front view of a single-boiler series-connected cast aluminum silicon water heater coupled with premixed water-cooled combustion.

[0038] Figure 2a It is an axonometric view of an axisymmetric single pot plate of the present invention.

[0039] Figure 2b It is a front view of the axisymmetric single pot plate of the present invention.

[0040] Figure 2c It is a right side view of the axisymmetric single pot plate of the present invention.

[0041] Figure 2d It is a full cross-sectional view of the axisymmetric single pot plate of the present invention.

[0042] Figure 2e This is a full cross-sectional view of an axisymmetric single pot plate of another scheme.

[0043] Figure 3 Schematic diagram of the water cooling channel of an integrated axisymmetric single pot.

[0044] Figure 4a It is the axial view of the downstream waist-round pin-fin structure in the axisymmetric single-boiler condensation heat exchange zone.

[0045] Figure 4b It is the front view of the downstream waist-round pin-fin structure in the axisymmetric single-boiler condensation heat exchange zone.

[0046] Figure 5a This is the front view of the front cover.

[0047] Figure 5b The rear view of the front cover.

[0048] Figure 6a The front view of the rear cover.

[0049] Figure 6b Rear view of the rear cover

[0050] Figure 7a This is the front view of the special-shaped cigarette box.

[0051] Figure 7b This is the right view of the special-shaped cigarette box.

[0052] Figure 8a This is an axonometric view of a water-cooled combustion head assembled from a water-cooled annular cavity.

[0053] Figure 8b The front view of the water-cooled burner head assembled by the water-cooled annular cavity.

[0054] Figure 8c AA cross-sectional view of a water-cooled burner head assembled from a water-cooled annular cavity

[0055] Figure 9a Front view of the water-cooled annular cavity

[0056] Figure 9b This is the right view of the water-cooled annular cavity.

[0057] Fig.9c This is a schematic diagram of water flow in the water-cooled annular cavity based on the AA cross-sectional view.

[0058] Fig.10a It is an axonometric view of the annular water-cooled annular burner head of the present invention.

[0059] Fig.10b It is a front view of the annular water-cooled annular burner head of the present invention.

[0060] Fig.10c It is a left side view of the annular water-cooled annular burner head of the present invention.

[0061] Fig.10d It is an AA cross-sectional view of the annular water-cooled annular burner head of the present invention.

[0062] Fig.10e The annular water-cooled annular burner head of the present invention is a BB cross-sectional view reflecting the water flow process.

[0063] Fig.11a It is an axonometric view of a single-boiler series-connected cast aluminum silicon water heater coupled with premixed water-cooled combustion according to the present invention.

[0064] Fig.11b It is a front view of a single-boiler series-connected cast aluminum silicon water heater coupled with premixed water-cooled combustion according to the present invention.

[0065] Fig.12a It is a front view of the axisymmetric pot sheet of the present invention.

[0066] Figure 12b It is a left view of the axisymmetric pot sheet of the present invention.

[0067] Fig.12c It is a cross-sectional view of the axisymmetric pot sheet of the present invention.

[0068] Fig.13 Schematic diagram of the water cooling channel of the axisymmetric pot.

[0069] Fig.14a The front view of the front cover.

[0070] Fig.14b The rear view of the front cover.

[0071] Fig.15a The front view of the rear end cover.

[0072] Fig.15b Rear view of the rear cover

[0073] Fig.16a This is an axonometric diagram of a single boiler-series cast aluminum silicon water heater coupled with premixed water-cooled combustion, which is assembled by combining a symmetrical single boiler and an isobaric wind bin distributor in the present invention.

[0074] Fig.16b This is the front view of the above series-connected cast aluminum silicon water heater

[0075] Fig.17a It is the front view of a symmetrical single pot.

[0076] Fig.17b It is the right view of the symmetrical single pot piece.

[0077] Fig.17c It is a full cross-sectional view of a symmetrical single pot piece. DETAILED DESCRIPTION

[0078] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments:

[0079] Implementation Case 1

[0080] like Figure 1a and Figure 1b As shown, the present invention relates to a single-boiler series-connected cast aluminum silicon hot water boiler coupled with premixed water-cooled combustion. Its main structure is formed by sealing the front and rear end faces of 2 to 12 axisymmetric single boilers 1 in sequence and then connecting them in series with bolts 4 according to the capacity requirements; a front cover plate 5 is arranged at the center of the furnace of the front boiler in the axisymmetric single boiler 1, and the front cover plate 5 is connected inwardly to a cylindrical flow-averaging orifice plate 3 and supported on the annular inner wall surface of the annular water-cooled combustion head 2. The cylindrical flow-averaging orifice plate 3 passes through the annular water-cooled combustion head 2 of each axisymmetric single boiler 1, and the front cover plate 5 is connected outwardly to the annular inner wall surface of the annular water-cooled combustion head 2. It is connected to the premixer through a connecting elbow 6, and the front and rear boiler pin-fin parts of the axisymmetric single boiler 1 are arranged with lined insulation cover plates 7; the top and bottom ends of the front boiler are provided with water side header sealing end covers 8, and the center of the furnace of the rear boiler is arranged with a rear cover plate 12 with a refractory insulation lining, and the bottom and top ends of the rear boiler are respectively provided with a water side inlet header 13 and a water side outlet header 14 for realizing water circulation; on the left and right sides of the main structure, removable ash cleaning baffles 10 and sand discharge plugs 11 are provided; at the bottom end of the main structure, a special-shaped smoke box 9 is provided.

[0081] like Figure 2a , Figure 2b , Figure 2c As shown, the front and rear sides of the outer part of the axisymmetric single boiler plate 1 are divided into a radiation zone, a convection zone and a condensation zone from top to bottom, wherein an annular water-cooled burner head 2 which is the same as or separated from the axisymmetric single boiler plate 1 is arranged at the center of the combustion chamber of the radiation zone, and the annular water-cooled burner head 2 comprises an annular water-cooling channel 101, and the surface of the annular water-cooling channel 101 is provided with anti-flashback ribs 102 and flame-stabilizing columns 103 in a centrally symmetrical form; circular needle ribs 104 and waist-round needle ribs 106 are regularly arranged on the outer side of the combustion chamber of the radiation zone of the axisymmetric single boiler plate 1, the convection zone and the condensation zone; the first bases 108 on both sides of the bottom of the axisymmetric single boiler plate 1 are used to connect with the special-shaped smoke box 9; the gas The mixed gas with air enters the cylindrical flow equalizing orifice plate 3 from the connecting elbow 6, flows through the annular water-cooled combustion head 2 after flow equalization, and is uniformly ejected along the annular gaps of adjacent axially symmetrical single boiler plates 1 and then ignited, and burns at axial intervals along the annular cylindrical surface; the high-temperature flue gas fills the radiation area around the furnace of the hot water boiler and then washes downward the pin-fin heating surfaces of the convection area and the condensation area, and flows into the special-shaped smoke box 9 from the bottom end of the main structure formed by 2 to 12 axially symmetrical single boiler plates 1, and the flue gas gathers and turns to be discharged upward; the interior of the axially symmetrical single boiler plate 1 is a hollow cavity, and the return water enters from the waterway inlet header interface 109 at the bottom and flows out from the first waterway outlet header interface 110 at the top.

[0082] Pairs of bolt connection holes 105, cleaning ports 107 and sand discharge ports 117 are arranged on both sides of the axisymmetric single boiler plate 1; the bolt connection holes 105 align the front and rear end surfaces of 2 to 12 axisymmetric single boiler plates 1 and connect them in series and then connect them with bolts 4; the opening of the cleaning port 107 ensures that 1 / 3 to 1 / 2 of the convection zone can be cleaned, avoiding the need to unseal the sealed furnace body when cleaning is required during the heating season, and assembling it with the detachable cleaning baffle 10; the sand discharge port 117 is located opposite to the transverse rib 116, directly penetrates into the waterway in depth, and is assembled with the sand discharge plug 11.

[0083] like Figure 2d and Figure 3 As shown, the anti-flashback rib 102 has a corn kernel cross-section structure. After being arranged along the circumference, the spacing between two adjacent anti-flashback ribs 102 is equal along the radial direction, and the spacing is 1 to 10 mm. The height of the anti-flashback rib 102 is 6 to 30 mm. The specific value should ensure that the average gas ejection speed of the mixed gas when passing through the gap is 2 to 3 m / s; the flame stabilizing column 103 is located on the outside of the anti-flashback rib 102 and is staggered with the anti-flashback rib 102 to stabilize the flame. The height of the flame stabilizing column 103 is consistent with the anti-flashback rib 102; annular base ribs 113 are arranged around the wall of the combustion chamber in the radiation zone, and 4 to 8 hole seats 111 with threaded holes are evenly arranged on the annular base rib 113. The front and rear pot plates in the axisymmetric single pot plate 1 are respectively connected to the front cover plate 5 and the rear cover plate 12 through the hole seats 111.

[0084] In addition, the internal hollow cavity of the axisymmetric single pot plate 1 is a water channel space, which is divided by a longitudinal rib 115 along the vertical direction and a plurality of transverse ribs 116 along the horizontal direction. The longitudinal rib 115 divides the entire water channel space into two parts along the left and right sides, and the spacing between each two transverse ribs 116 varies from 40 to 120 mm, and from bottom to top, the longitudinal distance between adjacent transverse ribs 116 decreases layer by layer; the water flows in the water channel space corresponding to the smoke condensation zone and the convection zone along the serpentine bend upward to the bottom of the radiation zone; the convection zone The upper transverse rib 116 has an inclination angle of 0 to 10° with the horizontal direction, and a first steam release hole 114 is processed at the end; the water channel structure corresponding to the radiation zone of the axisymmetric single boiler plate 1 is composed of the annular water cooling channel 101 in the center of the radiation zone furnace and the side water channels 112 on the outside of the annular base rib 113, that is, on both sides of the furnace. Under this structure, the water flow is divided at the bottom of the radiation zone, and rises in parallel along the annular water cooling channel 101 and the side water channel 112, and finally converges and flows out at the first water channel outlet header interface 110.

[0085] like Figure 4a and Figure 4bAs shown, the circular needle fins 104 and the waist-round needle fins 106 of the axisymmetric single pot sheet 1 are arranged in different ways along the flue gas flow direction; the circular needle fins 104 in the radiation zone are lower in height than those in the convection zone, and have larger diameters and transverse and longitudinal intercepts; as the flue gas temperature and radiation amount decrease along the flue gas flow direction, the height of the circular needle fins 104 gradually increases, and they are arranged in a tightly staggered regular triangle in the convection zone where the flue gas temperature is lower than 500°C, with the shortest distance between ribs being 3 to 4 mm; in terms of height, the circular needle fins 104 are of equal height, or a uniform high-low staggered design of one row or two rows as a group is adopted, and the height difference is not greater than 1 / 3 of the average height; in the condensation zone where the flue gas temperature is lower than 65°C, circular needle fins 104 and waist-round needle fins 106 whose long diameter is consistent with the flue gas flow direction are adopted, and the short diameter of the waist-round needle fins 106 is the same as the diameter of the circular needle fins 104 in the condensation zone, and the parallel channels between the ribs can provide sufficient heat exchange area for flue gas condensation, thereby ensuring the continuous condensation process.

[0086] like Figure 5a , Figure 5b , Figure 6a and Figure 6b As shown, the front cover plate 5 and the rear cover plate 12 have similar overall structures and are made by a set of molds, and the molding method is casting or stamping; the front cover plate 5 and the rear cover plate 12 are both disc-like structures, and there are circumferential openings 501 at the outer boundaries, which are used to connect with the annular base ribs 113 of the axisymmetric single pot plate 1; four centripetal support ribs 504 are arranged on the inner side of the disc-like structure to support the cylindrical flow-equalizing orifice plate 3; the method of processing the rear cover plate 12 into the front cover plate 5 is specifically as follows: after the rear cover plate 12 is obtained by casting or stamping, the center opening of the rear cover plate 12 is opened to allow the cylindrical flow-equalizing orifice plate 3 to be inserted, and at the same time, a threaded hole 502 is added at the outer end face of the disc-like structure, and an integrated monitoring system 503 including an ignition hole, a flame monitoring hole, and a pressure monitoring hole is processed or added on the outer end surface.

[0087] like Figure 7a and Figure 7b As shown, the special-shaped smoke box 9 is made of plastic, such as PTFE, PVC, PP or ABS, and is structurally composed of a dew receiving plate 901 and a smoke exhaust outlet 902. The dew receiving plate 901 is a special-shaped polyhedron, and its local cross-sectional area gradually decreases along the length, width and height directions to ensure that there is a lowest point in the structure.

[0088] Implementation Case 2

[0089] In this embodiment, the same symbols are given to the same structures as those in the first embodiment, and the same descriptions are omitted.

[0090] Figure 2eIt is another water channel structure of the radiation zone of an axisymmetric single boiler plate 1: the side water channel 112 of the annular base rib 113 is divided into an ascending water channel 119 and a descending water channel 120 by a dividing rib 118. Therefore, the entire water channel structure is composed of an annular water-cooling channel 101, an ascending water channel 119 and a descending water channel 120. Under this structure, the water flow does not diverge at the bottom of the radiation zone, but flows left and right to the two sides of the furnace, turns 90 degrees to enter the ascending water channel 119, and when it goes up to the vicinity of the first water channel outlet header interface 110, it turns inward 180 degrees and goes downward to enter the descending water channel 120, and after reaching the bottom of the furnace, it turns inward 90 degrees and flows to the longitudinal rib 115 of the axisymmetric single boiler plate 1, then turns 90 degrees upward to merge into the annular water-cooling channel 101 and rise, and finally merges and flows out at the first water channel outlet header interface 110.

[0091] Implementation Case 3

[0092] In this embodiment, the same symbols are given to the same structures as those of Implementation Example 1 and Implementation Example 2, and the same descriptions are omitted.

[0093] Figure 8a , 8b, 8c, 9a, 9b and 9c together give the split structure between the annular water-cooled combustion head 2 and the axisymmetric single boiler plate 1: the annular water-cooled combustion head 2 is assembled by multiple water-cooled annular cavities 15, inlet and outlet independent headers 16 and front end flanges 17; the main structure of the water-cooled annular cavity 15 includes an annular water-cooling channel 1501, anti-flashback fins 1502 and flame-stabilizing ribs 1503; the number of water-cooled annular cavities 15 is the same as the number of axisymmetric single boiler plates 1, and water inlet and outlet holes 1504 are respectively opened on both sides of the annular inner wall of the water-cooled annular cavity 15, which are used to dock and assemble with the inlet and outlet independent headers 16, thereby realizing independent water circulation inside the split structure; the water matching the front boiler plate of the axisymmetric single boiler plate 1 The front end of the cold annular cavity 15 is connected to a front end flange 17, which is used to connect to the front cover plate 5 and the connecting elbow 6 of the cast aluminum silicon water heater; at the same time, the inner wall of the water-cooled annular cavity 15 is equipped with two arc-shaped equalizing flow orifice plates 18, and the opening position of the arc-shaped equalizing flow orifice plates 18 is just opposite to the gap between the anti-flashback fins 1502, and the opening shape is circular, oval, elliptical or oblong, and the edges of the two arc-shaped equalizing flow orifice plates 18 are located on the upper and lower sides of the inlet and outlet independent headers 16; at this time, the mixture of gas and air is fully mixed and firstly evenly flows through the arc-shaped equalizing flow orifice plates 18, and then passes through the anti-flashback fins 1502 and the flame-stabilizing ribs 1503 between the water-cooled annular cavities 15, and finally is evenly sprayed out and ignited to burn along the circumferential gap intervals of the cylindrical surface.

[0094] Implementation Case 4

[0095] In this embodiment, the same symbols are given to the same structures as those in the first to third embodiments, and the same descriptions are omitted.

[0096] Fig.10a , 10b, 10c, 10d and 10e are another split structure between the annular water-cooled combustion head 2 and the axisymmetric cast aluminum silicon single pot plate 1: the annular water-cooled combustion head 2 is cast as a whole, and the main body includes an annular water-cooled space 201, an anti-flashback column 202, a stabilizing column 203 and a header main pipe 204; wherein, the anti-flashback column 202 and the stabilizing column 203 are evenly distributed on the surface of the annular water-cooled space 201 with central symmetry, and the anti-flashback column 202 has a corn kernel cross-sectional structure. After being arranged along the circumference, it should be ensured that the spacing between the two symmetrical anti-flashback columns 202 is equal along the radial direction, and the spacing is 1 to 10 mm; the height of the anti-flashback column 202 is 6 to 30 mm, and the specific value should ensure that the average gas ejection speed of the mixed gas when passing through the gap is 2 to 3 m / s; the stabilizing column 203 is located on the outside of the anti-flashback column 202 and is staggered with the anti-flashback column 202 to stabilize the flame, and the stabilizing column 203 The height is consistent with the anti-backfire column 202; the outer cross-sectional shape of the header main pipe 204 is circular, oblong, elliptical or oval, and the header main pipe 204 is divided into an inlet pipe 205 and an outlet pipe 206 by the middle rib; the working medium water of the annular water-cooled burner 2 enters from the inlet pipe 205 and is distributed to each annular water-cooled space 201, and after circumferential flow heat exchange, it is collected in the outlet pipe 206 to complete the independent water circulation; at the same time, the annular water-cooled burner The inner wall of the burner head 2 is provided with an arc-shaped flow equalizing orifice plate 18, the opening position of the arc-shaped flow equalizing orifice plate 18 is just opposite to the gap of the anti-flashback column 202, and the shape of the opening is circular, oval, elliptical and or oblong; at this time, the mixture of gas and air is fully mixed and firstly flows evenly through the arc-shaped flow equalizing orifice plate 18, and then passes through the anti-flashback column 202 and the stable combustion column 203 of the annular water-cooled burner head 2, and finally is evenly sprayed out and ignited to burn along the circumferential gap intervals of the cylindrical surface.

[0097] Implementation Case 5

[0098] In this embodiment, the same symbols are given to the same structures as those in implementation examples 1 to 4, and the same descriptions are omitted.

[0099] like Fig.11a and 11bAs shown, a single-boiler series-connected cast aluminum silicon hot water boiler coupled with premixed water-cooled combustion, the main structure of which is formed by sealing the front and rear end faces of 2 to 12 axisymmetric boilers 19 in sequence and then connecting them in series with bolts according to the capacity requirements; a front cover plate 22 is arranged in front of the furnace of the front boiler of the axisymmetric boiler 19, which is connected inwardly with a rectangular flow-averaging orifice plate 21 and supported on the inner wall surface of the parallel water-cooled combustion head 20, the rectangular flow-averaging orifice plate 21 passes through the parallel water-cooled combustion head 20 of each axisymmetric boiler 19, and the front cover plate 22 is bent outwardly. The head 23 is connected to the premixer, and the front and rear boiler pin-fin parts of the axisymmetric boiler plate 19 are arranged with insulation plates 24; in addition, the top and bottom ends of the front boiler plate are provided with inlet and outlet header sealing end covers 25, and the center of the furnace of the rear boiler plate is arranged with a rear end cover plate 29 with a refractory insulation lining, and the bottom and top ends of the rear boiler plate are respectively provided with a water inlet main pipe 30-1 and a water outlet main pipe 30-2 for realizing water circulation; on the left and right sides of the main structure, there are ash cleaning baffles 27 and plugs 28; at the bottom end of the main structure, there is a smoke box 26.

[0100] like Fig.12a , as shown in 12b and 12c, the front and rear sides of the outside of the axisymmetric pot sheet 19 are divided into a radiation zone, a convection zone and a condensation zone from top to bottom, wherein a parallel water-cooled combustion head 20 which is integral with the axisymmetric pot sheet 19 is arranged in the center of the combustion chamber of the radiation zone, and the parallel water-cooled combustion head 20 includes parallel water-cooling channels 1901 on both sides of a central rectangular cross-section cavity 1904, and the surface of the parallel water-cooling channel 1901 is provided with anti-tempering ribs 1902 and flame-stabilizing fins 1903 in an axisymmetric form; the outer side of the combustion chamber of the radiation zone of the axisymmetric pot sheet 19, the convection zone and the condensation zone are regularly arranged with circular pin fins 1905 and waist-round pin fins 1907; the bottom of the axisymmetric pot sheet 19 The bases 1909 on both sides are used to connect with the smoke box 26; the gas and air mixture enters the rectangular flow equalizing orifice plate 21 from the elbow 23, and after equalizing, it is evenly sprayed to both sides along the gap between the boiler plates through the central rectangular cross-section cavity 1904, and then ignites and burns along the plane intervals; the high-temperature flue gas fills the radiation area around the furnace of the hot water boiler and then washes downward the pin-fin heating surfaces of the convection area and the condensation area, and flows into the smoke box 26 from the bottom end of the main structure formed by 2 to 12 axially symmetrical boiler plates 19, and the flue gas gathers and turns to be discharged upward; the interior of the axially symmetrical boiler plate 19 is a hollow cavity, and the return water enters from the waterway inlet interface 1910 at the bottom and flows out from the second waterway outlet header interface 1911 at the top.

[0101] The inner hollow cavity of the axisymmetric boiler plate 19 is a water channel space, which is divided by a longitudinal rib 1916 along the vertical direction and a plurality of transverse ribs 1917 along the horizontal direction. The longitudinal rib 1916 divides the entire water channel space into two parts along the left and right sides. The spacing between each two transverse ribs 1917 varies from 40 to 120 mm, and from bottom to top, the spacing between adjacent transverse ribs 1917 decreases layer by layer. The outer periphery of the radiation zone furnace is an outer water channel 1912; the water flows upward along the serpentine bend in the water channel space corresponding to the flue gas condensation zone and the convection zone to the bottom of the radiation zone, and then splits at the bottom of the radiation zone, and rises in parallel along the parallel water cooling channel 1901 and the outer water channel 1912 respectively, and then converges and flows out at the second water channel outlet header interface 1911; the transverse ribs 1917 at the upper part of the convection zone have an inclination angle of 0 to 10° with the horizontal direction, and a second steam release hole 1915 is processed at the end.

[0102] Pairs of connecting holes 1906, cleaning grooves 1908 and sand discharge holes 1918 are arranged on both sides of the axisymmetric pot plate 19; the connecting holes 1906 align the front and rear end surfaces of 2 to 12 axisymmetric pot plates 19 and connect them in series; the opening of the cleaning grooves 1908 ensures that 1 / 3 to 1 / 2 of the convection zone can be cleaned, avoiding the need to unseal the sealed furnace body when cleaning is required during the heating season, and assembling it with the cleaning baffle 27; the sand discharge holes 1918 are positioned opposite to the transverse ribs 1917, and directly penetrate into the water channel in depth, and are assembled with the plug 28.

[0103] like Fig.13 As shown, the anti-flashback ribs 1902 and flame-stabilizing wings 1903 are evenly distributed on the surfaces of two parallel water-cooling channels 1901 in an axially symmetrical manner. The anti-flashback ribs 1902 are of an oblong or rectangular cross-sectional structure. The spacing between adjacent anti-flashback ribs is 1 to 10 mm, and the height is 6 to 30 mm. The specific values ​​should ensure that the average gas ejection velocity of the mixed gas when passing through the gap is 2 to 3 m / s; the flame-stabilizing wings 1903 are located on the outside of the anti-flashback ribs 1902 and are staggered with the anti-flashback ribs 1902 to stabilize the flame; annular ribs 1913 are arranged around the furnace wall of the radiation zone combustion chamber, and 4 to 8 screw holes 1914 are evenly arranged on the annular ribs 1913. The front and rear pot plates in the axially symmetrical pot plate 19 are respectively connected to the front cover plate 22 and the rear cover plate 29 through the screw holes 1914.

[0104] like Fig.14a , Fig.14b , Fig.15a and Fig.15bAs shown, the front end cover plate 22 and the rear end cover plate 29 have similar overall structures and are made by a set of molds, and the molding method is casting or stamping; the front end cover plate 22 and the rear end cover plate 29 are both disc-like structures, and there are circumferential holes 2201 at the outer boundaries, which are used to connect with the annular ribs 1913 of the axisymmetric pot plate 19; reinforcing ribs 2204 are arranged on the inner side of the disc-like structure to support the rectangular flow-equalizing orifice plate 21; the method of processing the rear end cover plate 29 into the front end cover plate 22 is specifically as follows: after the rear end cover plate 29 is obtained by casting or stamping, a rectangular hole is opened at the center of the rear end cover plate 29, and a screw hole 2202 is added at the outer end face of the disc-like structure, and it is positioned on the reinforcing rib 2204, and a monitoring system integration seat 2203 including an ignition hole, a flame monitoring hole, and a pressure monitoring hole is processed or added on the outer end surface.

[0105] Implementation Case 6

[0106] In this embodiment, the same symbols are given to the same structures as those in the first to fifth embodiments, and the same descriptions are omitted.

[0107] like Fig.16a and Fig.16b As shown, a single boiler-series cast aluminum silicon hot water boiler coupled with premixed water-cooled combustion, the main structure of which is formed by 2 to 12 symmetrical single boilers 31, the front and rear end faces of which are sealed in sequence and then connected in series with bolts according to the capacity requirements; isobaric wind bin distributors 32 are installed on both sides of the top of the symmetrical single boiler 31; the front and rear boiler pin-fin parts of the symmetrical single boiler 31 are arranged with heat-resistant baffles 33; in addition, the top and bottom ends of the front boiler are provided with header covers, and the bottom and top ends of the rear boiler are respectively provided with a water inlet main pipeline 37-1 and a water outlet main pipeline 37-2 for realizing water circulation; on the left and right sides of the main structure, a dust cleaning cover plate 35 and a sealing plug 36 are provided; at the bottom end of the main structure, a smoke exhaust box 34 is provided;

[0108] like Fig.17aAs shown, the front and rear sides of the exterior of the symmetrical single boiler 31 can be divided into a radiation zone, a convection zone and a condensation zone from top to bottom; the gas and air are uniformly and fully mixed in the premixer and then diverted into the isobaric wind bin distributors 32 located on both sides of the top of the furnace of the symmetrical single boiler 31, and after uniform flow, they are uniformly sprayed out along the gaps of each symmetrical single boiler 31 for ignition and combustion; under this structure, the water channels 3101 on both sides of the top of the furnace serve as water-cooled combustion heads, on which anti-flashback fins 3102 and flame stabilizing ribs 3103 are arranged; the outer side of the combustion chamber in the radiation zone, the convection zone and the condensation zone are arranged according to the rules Circular ribs 3104 and waist-round ribs 3106 are arranged; the second bases 3108 on both sides of the bottom of the symmetrical single boiler plate 31 are used to connect with the smoke exhaust box 34; the furnace radiation zone becomes the radiation space of the flame, and the high-temperature flue gas fills the furnace radiation zone and then flushes downward the pin-fin heating surfaces of the convection zone and the condensation zone, and flows into the smoke exhaust box 34 from the bottom end of the main structure formed by 2 to 12 symmetrical single boiler plates 31, and the flue gas gathers and turns to be discharged upward; the interior of the symmetrical single boiler plate 31 is a hollow cavity, and the return water enters from the bottom inlet 3109 and flows out from the top outlet 3110.

[0109] The mixed gas flows through the anti-backfire fins 3102 and the flame stabilizing ribs 3103 and then ignites and burns; wherein, the anti-backfire fins 3102 have a rectangular or oblong cross-sectional structure, the spacing between adjacent anti-backfire fins 3102 is 1 to 10 mm, and the height is 6 to 30 mm, and the specific value should ensure that the average gas ejection velocity of the mixed gas when passing through the gap is 2 to 3 m / s; the flame stabilizing ribs 3103 are located on the outside of the anti-backfire fins 3102 and are staggered with the anti-backfire fins 3102 to stabilize the flame, and the height is consistent with the anti-backfire fins 3102; a plurality of support hole seats 3111 with bolt holes are arranged on both sides of the top of the symmetrical single pot plate 31, which are used to connect with the isobaric wind bin distributor 32.

[0110] The circular ribs 3104 and the waist round ribs 3106 of the symmetrical single pot sheet 31 are arranged in different ways along the flue gas flow direction. The circular ribs 3104 in the radiation zone are lower in height and have larger diameters and transverse and longitudinal intercepts than the circular needle ribs in the convection zone. As the flue gas temperature and the radiation amount decrease along the flue gas flow direction, the height of the circular ribs 3104 gradually increases. In the convection zone where the flue gas temperature is lower than 500°C, the circular ribs 3104 are arranged in a tightly staggered regular triangle, and the shortest distance between the circular ribs 3104 is 3 to 4 mm. In terms of height, the circular ribs 3104 are of equal height. , or adopt a uniform staggered design of one row or two rows as a group, and the height difference should not be greater than 1 / 3 of the average height; in the condensation area where the smoke temperature is lower than 65°C, circular ribs 3104 and waist-round ribs 3106 whose long diameter is consistent with the smoke flow direction are adopted, and the short diameter of the waist-round ribs 3106 is the same as the circular ribs 3104 in the condensation area, and the parallel channels between the ribs can provide sufficient heat exchange area for smoke condensation to ensure the continuous condensation process; the width of the condensation area gradually decreases along the smoke flow direction, so that the outer periphery of the lower half of the entire symmetrical single pot plate 31 is in a "∪" shape.

[0111] like Fig.17b As shown, a pair of front and rear connecting holes 3105, dust cleaning ports 3107 and cast sand discharge ports 3116 are arranged on both sides of the symmetrical single pot plate 31; the front and rear connecting holes 3105 align the front and rear end surfaces of 2 to 12 symmetrical single pot plates 31 and connect them in series; the opening of the dust cleaning ports 3107 ensures that 1 / 3 to 1 / 2 of the convection zone can be cleaned, avoiding the need to unseal the sealed furnace body when dust cleaning is required during the heating season, and assembling it with the dust cleaning cover plate 35; the cast sand discharge port 3116 is positioned opposite to the straight rib 3115, directly penetrates into the waterway in depth, and is assembled with the sealing plug 36.

[0112] like Fig.17c As shown, the inner hollow cavity of the symmetrical single boiler plate 31 is a water channel, which is divided by a central rib 3114 along the vertical direction and a plurality of straight ribs 3115 along the horizontal direction. The central rib 3114 divides the entire water channel space into two parts along the left and right sides. The spacing between each two straight ribs 3115 varies from 40 to 120 mm, and as the overall height increases, the cross-sectional height decreases layer by layer, and ensures that the cross-sectional height around the radiation zone is about 1 / 2 of the maximum cross-sectional height. The central rib 3114 and the straight ribs 3115 form left and right symmetrical serpentine water channels 3112; the straight ribs 3115 at the upper part of the convection zone have an inclination angle of 0 to 10°, and the ends thereof are processed with steam unloading holes 3113; under this structure, after the system return water enters each symmetrical single boiler plate 31, it bends and rises along the left and right symmetrical serpentine water channels 3112, and finally turns to the water channels 3101 on both sides of the top of the furnace until it merges and flows out at the top outlet 3110.

Claims

1. A single-boiler series-connected cast aluminum silicon water heater coupled with premixed water-cooled combustion, characterized in that: The main structure is formed by sealing the front and rear end surfaces of 2 to 12 axisymmetric single boilers (1) in sequence and then connecting them in series with bolts (4) according to the capacity requirements; a front cover plate (5) is arranged at the center of the furnace of the front boiler in the axisymmetric single boiler (1); the front cover plate (5) is connected inwardly to a cylindrical flow balancing orifice plate (3) and is supported on the annular inner wall surface of an annular water-cooled burner head (2); the cylindrical flow balancing orifice plate (3) passes through the annular water-cooled burner head (2) of each axisymmetric single boiler (1); the front cover plate (5) is connected outwardly to a premixer through a connecting elbow (6); The front and rear pot pin-fin parts of the symmetrical single pot (1) are provided with lined insulation cover plates (7); the top and bottom ends of the front pot are provided with water side header sealing end covers (8); the center of the furnace of the rear pot is provided with a rear cover plate (12) with a refractory insulation lining; the bottom and top ends of the rear pot are respectively provided with a water side inlet header (13) and a water side outlet header (14) for realizing water circulation; removable dust cleaning baffles (10) and sand discharge plugs (11) are provided on the left and right sides of the main structure; and a special-shaped smoke box (9) is provided at the bottom end of the main structure; The front and rear sides of the axisymmetric single boiler (1) are divided into a radiation zone, a convection zone and a condensation zone from top to bottom, wherein an annular water-cooled burner head (2) which is integral with or separate from the axisymmetric single boiler (1) is arranged at the center of the combustion chamber of the radiation zone, and the annular water-cooled burner head (2) comprises an annular water-cooling channel (101), and the surface of the annular water-cooling channel (101) is provided with anti-flashback ribs (102) and flame stabilizing columns (103) in a centrally symmetrical manner; circular needle ribs (104) and waist-round needle ribs (106) are regularly arranged on the outer side of the combustion chamber of the radiation zone of the axisymmetric single boiler (1), the convection zone and the condensation zone; the first bases (108) on both sides of the bottom of the axisymmetric single boiler (1) are used to connect with the special-shaped smoke box (9) The fuel gas and air mixture enters the cylindrical flow-averaging orifice plate (3) from the connecting elbow (6), flows through the annular water-cooled combustion head (2) after being evenly flowed, and is uniformly ejected along the annular gaps of the adjacent axisymmetric single boiler plates (1) and then ignites, burning at intervals along the axial direction of the annular cylindrical surface; the high-temperature flue gas fills the radiation area around the furnace of the hot water boiler and then washes downwardly the pin-fin heating surfaces of the convection area and the condensation area, and flows into the special-shaped smoke box (9) from the bottom end of the main structure formed by 2 to 12 axisymmetric single boiler plates (1), and the flue gas gathers and turns to be discharged upward; the interior of the axisymmetric single boiler plate (1) is a hollow cavity, and the return water enters from the waterway inlet header interface (109) at the bottom end and flows out from the first waterway outlet header interface (110) at the top end; The anti-flashback rib (102) has a corn kernel cross-section structure. After being arranged along the circumference, the spacing between two adjacent anti-flashback ribs (102) is equal along the radial direction and is 1 to 10 mm. The height of the anti-flashback rib (102) is 6 to 30 mm. The specific value should ensure that the average gas ejection speed of the mixed gas when passing through the gap is 2 to 3 m / s. The flame stabilizing column (103) is located outside the anti-flashback rib (102) and is staggered with the anti-flashback rib (102) to stabilize the flame. The height of the flame stabilizing column (103) is consistent with the anti-flashback rib (102). The wall surface of the combustion chamber in the radiation zone is surrounded by annular base ribs (113). 4 to 8 hole seats (111) with threaded holes are evenly arranged on the annular base rib (113). The front and rear pot plates in the axisymmetric single pot plate (1) are respectively connected to the front cover plate (5) and the rear cover plate (12) through the hole seats (111). The circular needle ribs (104) and the waist-round needle ribs (106) of the axisymmetric single pot sheet (1) are arranged in different ways along the flue gas flow direction; the circular needle ribs (104) in the radiation zone are lower in height and have larger diameters and transverse and longitudinal intercepts than the circular needle ribs in the convection zone; as the flue gas temperature and radiation amount decrease along the flue gas flow direction, the height of the circular needle ribs (104) gradually increases, and in the convection zone where the flue gas temperature is lower than 500° C., they are arranged in a closely staggered regular triangle, with the shortest distance between ribs being 3 to 4 mm; in terms of height, the circular needle ribs (104) are of equal height, or are arranged in a uniform row or in a plurality of rows. Two rows form a group and are staggered in height, with the height difference being no greater than 1 / 3 of the average height; in the condensation zone where the smoke temperature is lower than 65°C, circular needle ribs (104) and waist-round needle ribs (106) whose long diameter is consistent with the smoke flow direction are used, the short diameter of the waist-round needle ribs (106) is the same as the diameter of the circular needle ribs (104) in the condensation zone, and the parallel channels between the ribs can provide sufficient heat exchange area for smoke condensation, thereby ensuring the continuous condensation process; the width of the entire condensation zone gradually decreases along the smoke flow direction, so that the outer periphery of the lower half of the entire axisymmetric single boiler plate (1) is in a "∪" shape as a whole; The inner hollow cavity of the axisymmetric single boiler plate (1) is a water channel space, and the water channel space is divided by longitudinal ribs (115) along the vertical direction and a plurality of transverse ribs (116) along the horizontal direction. The longitudinal ribs (115) divide the entire water channel space into two parts along the left and right sides. The spacing between each two transverse ribs (116) varies from 40 to 120 mm, and from bottom to top, the longitudinal distance between adjacent transverse ribs (116) decreases layer by layer. The water flows along the serpentine shape in the water channel space corresponding to the smoke condensation zone and the convection zone. The convection zone is bent upward to the bottom of the radiation zone; the transverse rib (116) at the upper part of the convection zone has an inclination angle of 0 to 10 degrees with the horizontal direction, and a first steam release hole (114) is processed at the end; there are two types of water channel structures corresponding to the radiation zone of the axisymmetric single boiler plate (1): one water channel structure is composed of an annular water cooling channel (101) at the center of the furnace of the radiation zone and side water channels (112) on the outside of the annular base rib (113), that is, on both sides of the furnace. Under this structure, the water flow is divided at the bottom of the radiation zone, and flows along the annular The water cooling channel (101) and the side water channel (112) rise in parallel and finally merge and flow out at the water channel outlet header interface (110); in another water channel structure, the side water channel (112) of the annular base rib (113) is divided into an ascending water channel (119) and a descending water channel (120) by a dividing rib (118), so that the entire water channel structure is composed of the annular water cooling channel (101), the ascending water channel (119) and the descending water channel (120). In this structure, the water flow is radially The bottom of the shooting area does not split, but flows to the left and right to the two sides of the furnace, turns 90 degrees to enter the ascending water channel (119), and when it reaches the vicinity of the water channel outlet header interface (110), it turns 180 degrees inward and enters the descending water channel (120) downward, and after reaching the bottom of the furnace, it turns 90 degrees inward and flows to the longitudinal rib (115) of the axisymmetric single boiler plate (1), then turns 90 degrees upward and merges into the annular water cooling channel (101) to rise, and finally merges and flows out at the water channel outlet header interface (110).

2. A single-boiler series-connected cast aluminum silicon water heater coupled with premixed water-cooled combustion according to claim 1, characterized in that: Pairs of bolt connection holes (105), ash cleaning ports (107) and sand discharge ports (117) are arranged on both sides of the axisymmetric single boiler plate (1); the bolt connection holes (105) align the front and rear end surfaces of 2 to 12 axisymmetric single boiler plates (1) in series and then connect them with bolts (4); the opening of the ash cleaning port (107) ensures that 1 / 3 to 1 / 2 of the convection zone can be cleaned, avoiding the need to unseal the sealed furnace body when ash cleaning is required during the heating season, and assembling it with a detachable ash cleaning baffle (10); the sand discharge port (117) is positioned opposite to the transverse rib (116), directly penetrates into the waterway in depth, and is assembled with a sand discharge plug (11).

3. The single-boiler series-connected cast aluminum silicon water heater coupled with premixed water-cooled combustion according to claim 1, characterized in that: The front cover plate (5) and the rear cover plate (12) have similar overall structures and are made by a set of molds, and the molding method is casting or stamping; the front cover plate (5) and the rear cover plate (12) are both disc-like structures, and there are circumferential openings (501) at the outer boundaries, which are used to connect with the annular base ribs (113) of the axisymmetric single pot plate (1); four centripetal support ribs (504) are arranged on the inner side of the disc-like structure to support the cylindrical flow-equalizing orifice plate (3); the method of processing the rear cover plate (12) into the front cover plate (5) is specifically as follows: after the rear cover plate (12) is obtained by casting or stamping, the center of the rear cover plate (12) is opened to allow the cylindrical flow-equalizing orifice plate (3) to be placed, and at the same time, a threaded hole (502) is added at the outer end face of the disc-like structure, and an integrated monitoring system (503) including an ignition hole, a flame monitoring hole, and a pressure monitoring hole is processed or added on the surface of the outer end face.

4. The single-boiler series-connected cast aluminum silicon water heater coupled with premixed water-cooled combustion according to claim 1, characterized in that: The axisymmetric single boiler plate (1) adopts an integral casting process and uses ZL101, ZL102, ZL104 or AlSi10Mg grade cast aluminum silicon magnesium alloy. The condensation area of ​​the axisymmetric single boiler plate (1) can construct a super-hydrophobic film, so that it has super-hydrophobicity, self-cleaning and corrosion resistance, so that the smoke side wall surface is corrosion-resistant, the heat and mass transfer performance is improved, the surface finish is improved, and dust accumulation is prevented; the cover plate (7) is made of stainless steel and is integrally stamped; the special-shaped smoke box (9) is made of plastic and is structurally composed of a dew receiving plate (901) and a smoke exhaust outlet (902); the dew receiving plate (901) is a special-shaped polyhedron, and its local cross-sectional area gradually decreases along the length direction, the width direction and the height direction to ensure that there is a lowest point in the structure.

5. The single-boiler series-connected cast aluminum silicon water heater coupled with premixed water-cooled combustion according to claim 1, characterized in that: When a split structure is adopted between the annular water-cooled combustion head (2) and the axisymmetric single boiler plate (1), the annular water-cooled combustion head (2) is assembled from a plurality of water-cooled annular cavities (15), an inlet and outlet independent header (16) and a front flange (17); the main structure of the water-cooled annular cavity (15) includes an annular water-cooling channel (1501), anti-flashback fins (1502) and flame-stabilizing ribs (1503); the number of water-cooled annular cavities (15) is the same as the number of the axisymmetric single boiler plate (1), and water inlet and outlet holes (1504) are respectively opened on both sides of the annular inner wall surface of the water-cooled annular cavity (15) for docking and assembly with the inlet and outlet independent header (16), thereby realizing independent water circulation inside the split structure; the water-cooled annular cavity (15) matches the front boiler plate of the axisymmetric single boiler plate (1). The front end of the cavity (15) is connected to a front flange (17) for connecting to the front cover (5) and the connecting elbow (6) of the cast aluminum silicon water heater; at the same time, the inner wall of the water-cooled annular cavity (15) is equipped with two arc-shaped equalizing orifice plates (18), the opening position of the arc-shaped equalizing orifice plates (18) is just opposite to the gap between the anti-flashback fins (1502), and the opening shape is circular, oval or elliptical. The edges of the two arc-shaped equalizing orifice plates (18) are located on the upper and lower sides of the inlet and outlet independent headers (16); at this time, the mixture of gas and air is fully mixed and firstly flows evenly through the arc-shaped equalizing orifice plates (18), and then passes through the anti-flashback fins (1502) and flame stabilizing ribs (1503) between each water-cooled annular cavity (15), and finally is evenly sprayed out and ignited to burn along the circumferential gap intervals of the cylindrical surface.

6. The single-boiler series-connected cast aluminum silicon water heater coupled with premixed water-cooled combustion according to claim 1, characterized in that: When the annular water-cooled burner head (2) and the axisymmetric cast aluminum silicon single pot plate (1) adopt a split structure, the annular water-cooled burner head (2) is cast as a whole, and the main body includes an annular water-cooled space (201), an anti-flashback column (202), a flame stabilizing column (203) and a header main pipe (204); wherein the anti-flashback column (202) and the flame stabilizing column (203) are evenly distributed on the surface of the annular water-cooled space (201) in a centrally symmetrical manner, and the anti-flashback column (202) is in the shape of corn The particle cross-sectional structure should ensure that the spacing between the two symmetrical anti-flashback columns (202) is equal along the radial direction after being arranged along the circumference, and the spacing is 1 to 10 mm; the height of the anti-flashback column (202) is 6 to 30 mm, and the specific value should ensure that the average gas ejection speed of the mixed gas when passing through the gap is 2 to 3 m / s; the stabilizing column (203) is located outside the anti-flashback column (202) and is staggered with the anti-flashback column (202) to stabilize the flame, and the height of the stabilizing column (203) is equal to the height of the anti-flashback column (202). The outer cross-section of the header main pipe (204) is circular, oblong, elliptical or oval, and the header main pipe (204) is divided into an inlet pipe (205) and an outlet pipe (206) by a middle rib; the working medium water of the annular water-cooled burner head (2) enters from the inlet pipe (205) and is distributed to each annular water-cooled space (201), and after circumferential flow heat exchange, it is collected in the outlet pipe (206) to complete an independent water cycle; at the same time, the annular water-cooled burner head (2) The inner wall of the combustion head (2) is provided with an arc-shaped flow balancing orifice plate (18), the opening position of the arc-shaped flow balancing orifice plate (18) is exactly opposite to the gap of the anti-flashback column (202), and the opening shape is circular, oval or elliptical; at this time, after the mixture of gas and air is fully mixed, it first flows evenly through the arc-shaped flow balancing orifice plate (18), then passes through the anti-flashback column (202) and the stable combustion column (203) of the annular water-cooled combustion head (2), and finally is evenly sprayed out and ignited to burn along the circumferential gap interval of the cylindrical surface.

7. A single-boiler series-connected cast aluminum silicon water heater coupled with premixed water-cooled combustion, characterized in that: The main structure is formed by sealing the front and rear end surfaces of 2 to 12 axisymmetric boiler plates (19) in sequence and then connecting them in series with bolts according to the capacity requirements; a front end cover plate (22) is arranged in front of the furnace of the front boiler plate of the axisymmetric boiler plate (19), which is connected inwardly with a rectangular flow balancing orifice plate (21) and supported on the inner wall surface of the parallel water-cooled combustion head (20); the rectangular flow balancing orifice plate (21) passes through the parallel water-cooled combustion head (20) of each axisymmetric boiler plate (19); the front end cover plate (22) is connected outwardly with the premixer through an elbow (23); and the front and rear boiler plate pin-fin parts of the axisymmetric boiler plate (19) are arranged with heat insulation plates (24); In addition, the top and bottom of the front boiler plate are provided with inlet and outlet header sealing end covers (25), the center of the furnace of the rear boiler plate is provided with a rear end cover plate (29) with a refractory heat insulation lining, and the bottom and top of the rear boiler plate are respectively provided with a water inlet main pipe (30-1) and a water outlet main pipe (30-2) for realizing water circulation; on the left and right sides of the main structure, there are provided ash cleaning baffles (27) and plugs (28); at the bottom of the main structure, there is provided a smoke box (26); the front and rear sides of the outside of the axisymmetric boiler plate (19) are divided into a radiation zone, a convection zone and a condensation zone from top to bottom, wherein the center of the combustion chamber of the radiation zone is provided with a 9) A parallel water-cooled combustion head (20) is integrated as a whole, and the parallel water-cooled combustion head (20) includes parallel water-cooled channels (1901) on both sides of a central rectangular cross-section cavity (1904), and the surface of the parallel water-cooled channel (1901) is provided with anti-tempering ribs (1902) and flame-stabilizing fins (1903) in an axisymmetric manner; the outer side of the combustion chamber in the radiation zone, the convection zone and the condensation zone of the axisymmetric pot plate (19) are regularly arranged with circular pin fins (1905) and waist-round pin fins (1907); the bases (1909) on both sides of the bottom of the axisymmetric pot plate (19) are used to connect with the smoke box (26); the gas and air mixture is discharged from the curved The head (23) enters the rectangular flow-equalizing orifice plate (21), and after equalizing the flow, it is ejected uniformly to both sides along the gap between the boiler plates through the central rectangular cross-section cavity (1904), and then ignites and burns at intervals along the plane; the high-temperature flue gas fills the radiation area around the furnace of the hot water boiler, and then washes downward the pin-fin heating surfaces in the convection area and the condensation area, and flows into the smoke box (26) from the bottom end of the main structure formed by 2 to 12 axisymmetric boiler plates (19), and the flue gas gathers and turns to be discharged upward; the interior of the axisymmetric boiler plate (19) is a hollow cavity, and the return water enters from the waterway inlet interface (1910) at the bottom, and flows out from the second waterway outlet header interface (1911) at the top; The anti-flashback ribs (1902) and flame-stabilizing wings (1903) are evenly distributed on the surfaces of two parallel water-cooling channels (1901) in an axisymmetric manner. The anti-flashback ribs (1902) have an oblong or rectangular cross-sectional structure. The spacing between adjacent anti-flashback ribs is 1 to 10 mm, and the height is 6 to 30 mm. The specific values ​​should ensure that the average gas ejection velocity of the mixed gas when passing through the gap is 2 to 3 m / s; the flame-stabilizing wings (1903) are located on the outside of the anti-flashback ribs (1902) and are arranged alternately with the anti-flashback ribs (1902) to stabilize the flame; annular ribs (1913) are arranged around the furnace wall of the radiation zone combustion chamber, and 4 to 8 screw holes (1914) are evenly arranged on the annular ribs (1913). The front and rear pot plates in the axisymmetric pot plate (19) are respectively connected to the front cover plate (22) and the rear cover plate (29) through the screw holes (1914); The circular pin fins (1905) and the waist-round pin fins (1907) of the axisymmetric pot sheet (19) are arranged in different ways along the flue gas flow direction; the circular pin fins (1905) in the radiation zone are lower in height and have larger diameters and transverse and longitudinal intercepts than those in the convection zone; as the flue gas temperature and radiation amount decrease along the flue gas flow direction, the height of the circular pin fins (1905) gradually increases, and in the convection zone where the flue gas temperature is lower than 500°C, they are arranged in a tightly staggered regular triangle, with the shortest distance between ribs being 3 to 4 mm; in terms of height, the circular pin fins (1905) are of equal height, or are arranged in a uniform row or A high-low staggered design is adopted in which two rows form a group, and the height difference is not greater than 1 / 3 of the average height; in the condensation zone where the smoke temperature is lower than 65°C, circular pin fins (1905) and waist-round pin fins (1907) whose long diameter is consistent with the smoke flow direction are used, and the short diameter of the waist-round pin fins (1907) is the same as the diameter of the circular pin fins (1905) in the condensation zone, and the parallel channels between the ribs can provide sufficient heat exchange area for smoke condensation, thereby ensuring the continuous condensation process; the width of the entire condensation zone gradually decreases along the smoke flow direction, so that the outer periphery of the lower half of the entire axisymmetric pot plate (19) is in a "∪" shape as a whole; The inner hollow cavity of the axisymmetric pot plate (19) is a water channel space, and the water channel space is divided by a longitudinal rib (1916) along the vertical direction and a plurality of transverse ribs (1917) along the horizontal direction. The longitudinal rib (1916) divides the entire water channel space into two parts along the left and right sides. The spacing between each two transverse ribs (1917) varies from 40 to 120 mm, and from bottom to top, the spacing between adjacent transverse ribs (1917) decreases layer by layer. The outer periphery of the radiation zone furnace is an outer water channel ( 1912); the water flows upward along the serpentine bend in the water channel space corresponding to the flue gas condensation zone and the convection zone to the bottom of the radiation zone, and then splits at the bottom of the radiation zone, rises in parallel along the parallel water cooling channel (1901) and the outer water channel (1912), and then converges and flows out at the second water channel outlet header interface (1911); the transverse ribs (1917) on the upper part of the convection zone have an inclination angle of 0 to 10 degrees with the horizontal direction, and a second steam release hole (1915) is processed at the end.

8. The single-boiler series-connected cast aluminum silicon water heater coupled with premixed water-cooled combustion according to claim 7, characterized in that: Pairs of connecting holes (1906), cleaning grooves (1908) and sand discharge holes (1918) are arranged on both sides of the axisymmetric pot plate (19); the connecting holes (1906) align the front and rear end surfaces of 2 to 12 axisymmetric pot plates (19) and connect them in series; the opening of the cleaning groove (1908) ensures that 1 / 3 to 1 / 2 of the convection zone can be cleaned, avoiding the need to unseal the sealed furnace body when cleaning is required during the heating season, and assembling it with the cleaning baffle (27); the sand discharge hole (1918) is positioned opposite to the transverse rib (1917), directly penetrates into the waterway in depth, and is assembled with the plug (28).

9. The single-boiler series-connected cast aluminum silicon water heater coupled with premixed water-cooled combustion according to claim 7, characterized in that: The front end cover plate (22) and the rear end cover plate (29) have similar overall structures and are made by a set of molds, and the molding method is casting or stamping; the front end cover plate (22) and the rear end cover plate (29) are both disc-like structures, and there are circumferential holes (2201) at the outer boundaries, which are used to connect with the annular ribs (1913) of the axisymmetric pot plate (19); reinforcing ribs (2204) are arranged on the inner side of the disc-like structure to support the rectangular flow-averaging orifice plate (21); the method of processing the rear end cover plate (29) into the front end cover plate (22) is specifically as follows: after the rear end cover plate (29) is obtained by casting or stamping, a rectangular hole is opened at the center of the rear end cover plate (29), and a screw hole (2202) is added at the outer end face of the disc-like structure, and it is positioned on the reinforcing rib (2204), and a monitoring system integrated seat (2203) including an ignition hole, a flame monitoring hole, and a pressure monitoring hole is processed or added on the outer end face surface.

10. A single-boiler series-connected cast aluminum silicon water heater coupled with premixed water-cooled combustion, characterized in that: The main structure is formed by sealing the front and rear end surfaces of 2 to 12 symmetrical single boilers (31) in sequence and then connecting them in series with bolts according to the capacity requirements; isobaric wind bin distributors (32) are installed on both sides of the top of the symmetrical single boiler (31); heat-resistant baffles (33) are arranged on the pin-fin parts of the front and rear boilers of the symmetrical single boiler (31); in addition, header covers are arranged at the top and bottom of the front boiler, and the bottom and top of the rear boiler are respectively provided with a water inlet main pipeline (37-1) and a water outlet main pipeline (37-2) for realizing water circulation; a dust cleaning cover (35) and a sealing plug (36) are arranged on the left and right sides of the main structure; and a smoke exhaust box (34) is arranged at the bottom of the main structure; The front and rear sides of the exterior of the symmetrical single boiler (31) can be divided into a radiation zone, a convection zone and a condensation zone from top to bottom; the gas and air are uniformly and fully mixed in the premixer and then diverted into the isobaric wind bin distributors (32) located on both sides of the top of the furnace of the symmetrical single boiler (31), and after equal flow, they are uniformly sprayed out along the gaps of each symmetrical single boiler (31) for ignition and combustion; under this structure, the water channels (3101) on both sides of the top of the furnace serve as water-cooled combustion heads, on which anti-flashback fins (3102) and flame stabilizing ribs (3103) are arranged; circular ribs are arranged regularly on the outer sides of the combustion chamber of the radiation zone, the convection zone and the condensation zone. (3104) and waist round ribs (3106); the second bases (3108) on both sides of the bottom of the symmetrical single boiler (31) are used to connect with the smoke exhaust box (34); the furnace radiation zone becomes the radiation space of the flame, and the high-temperature smoke fills the furnace radiation zone and then washes downward the pin-fin heating surfaces of the convection zone and the condensation zone, and flows into the smoke exhaust box (34) from the bottom end of the main structure formed by 2 to 12 symmetrical single boilers (31), and the smoke gathers and turns to be discharged upward; the interior of the symmetrical single boiler (31) is a hollow cavity, and the return water enters from the bottom inlet (3109) and flows out from the top outlet (3110); The mixed gas flows through the anti-backfire fins (3102) and the flame stabilizing ribs (3103) and then ignites and burns; wherein the anti-backfire fins (3102) are rectangular or oblong in cross-section, the spacing between adjacent anti-backfire fins (3102) is 1 to 10 mm, and the height is 6 to 30 mm, and the specific value should ensure that the average gas ejection speed of the mixed gas when passing through the gap is 2 to 3 m / s; the flame stabilizing ribs (3103) are located on the outside of the anti-backfire fins (3102) and are arranged in an alternating manner with the anti-backfire fins (3102) to stabilize the flame, and the height is consistent with the anti-backfire fins (3102); a plurality of support holes (3111) with bolt holes are arranged on both sides of the top of the symmetrical single pot plate (31) for connecting with the isobaric wind bin distributor (32); The circular ribs (3104) and the waist round ribs (3106) of the symmetrical single pot sheet (31) are arranged in different ways along the direction of smoke flow. The circular ribs (3104) in the radiation zone are lower in height and have larger diameters and transverse and longitudinal intercepts than the circular needle ribs in the convection zone. As the smoke temperature and radiation amount decrease along the direction of smoke flow, the height of the circular ribs (3104) gradually increases. In the convection zone where the smoke temperature is lower than 500° C., the circular ribs (3104) are arranged in a closely staggered regular triangle, and the shortest distance between the circular ribs (3104) is 3 to 4 mm. In terms of height, the circular ribs (3104) are ) are of equal height, or a uniform staggered design of one row or two rows as a group is adopted, and the height difference should not be greater than 1 / 3 of the average height; in the condensation zone where the smoke temperature is lower than 65°C, circular ribs (3104) and waist round ribs (3106) whose long diameter is consistent with the smoke flow direction are adopted, and the short diameter of the waist round ribs (3106) is the same as that of the circular ribs (3104) in the condensation zone, and the parallel channels between the ribs can provide sufficient heat exchange area for smoke condensation, thereby ensuring the continuous condensation process; the width of the condensation zone gradually decreases along the smoke flow direction, so that the outer periphery of the lower half of the entire symmetrical single pot plate (31) is in a "∪" shape; The inner hollow cavity of the symmetrical single pot plate (31) is a water channel, which is divided by a central rib (3114) along the vertical direction and a plurality of straight ribs (3115) along the horizontal direction. The central rib (3114) divides the entire water channel space into two parts along the left and right sides. The spacing between each two straight ribs (3115) varies from 40 to 120 mm. As the overall height increases, the cross-sectional height decreases layer by layer, and the cross-sectional height around the radiation area is ensured to be 1 / 2 of the maximum cross-sectional height. The core rib (3114) and the straight rib (3115) form symmetrical serpentine water channels (3112) on the left and right. The straight rib (3115) on the upper part of the convection zone has an inclination angle of 0 to 10 degrees, and a steam discharge hole (3113) is processed at its end. Under this structure, after the system return water enters each symmetrical single boiler plate (31), it bends and rises along the symmetrical serpentine water channels (3112) on the left and right, and finally turns to the water channels (3101) on both sides of the furnace top, until it merges and flows out at the top outlet (3110).

11. A single-boiler series-connected cast aluminum silicon water heater coupled with premixed water-cooled combustion according to claim 10, characterized in that: Pairs of front and rear connection holes (3105), dust cleaning ports (3107) and cast sand discharge ports (3116) are arranged on both sides of the symmetrical single pot plate (31); the front and rear connection holes (3105) align the front and rear end surfaces of 2 to 12 symmetrical single pot plates (31) and connect them in series; the opening of the dust cleaning port (3107) ensures that 1 / 3 to 1 / 2 of the convection zone can be cleaned, avoiding the need to unseal the sealed furnace body when dust cleaning is required during the heating season, and assembling it with the dust cleaning cover plate (35); the cast sand discharge port (3116) is positioned opposite to the straight rib (3115), directly penetrates into the waterway in depth, and is assembled with the sealing plug (36).

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