CN212511815U

CN212511815U - Single-boiler-sheet serial-connection cast aluminum-silicon hot water furnace structure for coupling premixed water-cooled combustion

Info

Publication number: CN212511815U
Application number: CN202021406124.7U
Authority: CN
Inventors: 赵钦新; 焦健; 邵怀爽; 王云刚; 梁志远
Original assignee: Xian Jiaotong University
Current assignee: Xian Jiaotong University
Priority date: 2020-07-16
Filing date: 2020-07-16
Publication date: 2021-02-09
Anticipated expiration: 2030-07-16

Abstract

The utility model discloses a single pot piece concatenation casting aluminium-silicon hot water furnace structure of water-cooling burning is mixed in advance in coupling, its body replaces three kinds of non-pot pieces by the single pot piece of axial symmetry and concatenates and form, and upper portion seals the special-shaped smoke box of combustion chamber radiation zone, middle part convection current district and condensation zone and lower part that forms by water-cooling combustion head and preceding, back shroud and constitutes. The center of the combustion chamber of the axisymmetric single boiler piece is provided with an annular water-cooling channel which is arranged in parallel and ascends or on two sides of the top of the hearth to form a water-cooling combustion head, mixed gas is sprayed out by an anti-backfire rib and a flame stabilizing column arranged on the water-cooling combustion head to ignite and combust, and high-temperature flue gas sequentially washes down the pin fin heating surface of a convection zone and a condensation zone from a hearth radiation zone, is collected in a special-shaped smoke box and turns and then is discharged upwards. The water channel is not externally connected but internally provided with the header, so that the sealing workload is reduced, the production efficiency is improved, and the whole body is more compact. The utility model discloses realize water-cooling burning and water-cooling heat transfer integration, reduce the combustion area temperature, restrain NOx and produce, make nitrogen oxide further reduce.

Description

Single-boiler-sheet serial-connection cast aluminum-silicon hot water furnace structure for coupling premixed water-cooled combustion

Technical Field

The utility model belongs to the heat energy engineering field, concretely relates to coupling mixes single pot piece concatenation casting aluminium silicon hot-water furnace structure of water-cooling burning in advance. The boiler equipment is used for the technical field of boiler equipment which has the advantages of improving the production efficiency, reducing the cost, saving energy, protecting environment and improving the product quality and reliability.

Background

According to the '2020 development report of Chinese energy and chemical industry', the natural gas demand of China reaches 3290 billion cubic meters in 2020, and the natural gas is increased by 8.8% on year-on-year basis, so that the natural gas becomes an important directional energy for adjusting the energy structure of China and a key alternative energy for improving the life quality of residents. Therefore, under the multiple influences of policies such as energy conservation and emission reduction, renewable energy utilization, coal gas change and the like, the whole gas heating furnace industry also meets brand-new development opportunities and more intense industry competition. The two problems that need to be faced in the aspects of technology and development are how to more effectively control the cost and how to more efficiently save energy and reduce consumption of commercial gas heating stoves which are gradually applied to schools, hotels, hospitals and communities.

In the aspect of cost control, the commercial condensation gas heating stove at present mainly uses cast aluminium silicon condensation heating stove, and it has high thermal conductivity concurrently, easily installation maintenance, and the design is nimble relatively, and advantages such as corrosion resistance is better, consequently occupies great share in the gas heating stove. However, most cast aluminum silicon condensation heating furnaces on the market at present adopt a modular combined structure of 1 front boiler piece, a plurality of middle boiler pieces and 1 rear boiler piece. Wherein the front boiler piece is connected with the head part of the burner, the rear boiler piece seals the flow of flue gas and supports the tail part of the burner, and the middle parts of the front boiler piece and the rear boiler piece are sequentially connected in series with 1-12 middle boiler pieces with the same structure. Therefore, to manufacture a cast aluminum silicon gas heating stove for producing a certain power range, at least 3 sets of different moulds are needed to produce a front pan sheet, a middle pan sheet and a rear pan sheet respectively, so that the cost of the casting mould is extremely high. Especially for the commercial fuel gas heating furnace with high power and large size, the weight of each level of boiler piece is about 70-100 kg, and the corresponding mould cost is more expensive. However, connect preceding pot piece and back pot piece of combustor, its actual production quantity generally only is 10 ~ 20% of well pot piece, consequently if can realize that above-mentioned three kinds of pot piece castings are structurally unified relatively, blur its difference in non-key details, accomplish the function of above-mentioned 3 kinds of different structure pot pieces simultaneously with 1 kind of single pot piece, just can reduce the casting mould into original 1/3, thereby effectively reduce manufacturing cost, improve production efficiency, reduce the rejection rate, also do benefit to and increase product series, show improvement product quality and reliability.

In the aspect of energy saving and consumption reduction, because the commercial cast aluminum silicon gas heating furnace has a very compact structure, the prior gas burner generally adopts a fully premixed metal fiber surface burner with shorter flame length, but the smaller furnace size ensures that the volume heat load of the fully premixed burner is extremely high, the emission of nitrogen oxides under rated load is often more than 30mg/m3, the emission index requirements of main urban pollutants in the country cannot be met, and the load reduction operation of the boiler is caused. However, the surface full premix combustion technology has some problems, on one hand, as the air-fuel premix proportion is increased, the stable combustion range of flame is reduced, which limits the large-scale of the full premix burner; on the other hand, because the full-premixing combustion is completed with accurate proportion mixing, the combustion is complete, the combustion speed is high, and the flame temperature is high, the conventional full-premixing surface combustion technology usually needs a large amount of excess air to cool the temperature of a combustion area, so that the generation of nitrogen oxides in the combustion process is reduced, however, the heat loss of exhaust smoke is increased due to a high excess air coefficient, and the thermal efficiency of a boiler is directly reduced.

In order to solve the problems of high excess air coefficient combustion and easy tempering, technicians at home and abroad develop a full-premixing water-cooling combustion technology on the basis of a full-premixing surface combustion technology, a burner head is formed by adopting a water-cooling tube bundle with a high heat transfer coefficient, the water-cooling tube bundle is sprayed out through a slit between the water-cooling tube bundles after premixing and then ignited for combustion, the water-cooling tube bundle takes away high temperature generated by premixed flame at the root of the flame quickly, the temperature of a combustion area is effectively reduced, and the generation of thermal NOx is further inhibited. Meanwhile, the 'cold wall effect' of the water-cooling tube bundle plays a role in flameout protection, and the tempering risk of the combustion head can be effectively reduced. Therefore, the fully premixed water-cooled combustion technology is also the first choice for many condensing boilers. In addition, almost all cast aluminum silicon condensation gas boilers in the current market are matched with fully premixed metal fiber surface burners, fans matched with the burners need anti-static fans, the power is low, if power limit is broken through, independent technical break-through is achieved, dependence on foreign technologies is reduced, and fully premixed water-cooled burners also need to be selected. At present, a product which combines a full-premixing water-cooling burner and cast aluminum silicon together in a precedent way, not to mention a product which integrates the full-premixing water-cooling burner and the cast aluminum silicon, does not exist.

Disclosure of Invention

In order to realize cost control and energy saving and consumption reduction, reduce the triple purpose that flue gas nitrogen oxide discharged simultaneously, reduce the unnecessary input of cast aluminium silicon condensation heating water heater in process of production, the utility model discloses organically combine water-cooling combustion head and axisymmetric heat transfer pot piece together to a single pot piece concatenation casting aluminium silicon hot water furnace structure of coupling water-cooling burning in advance is provided.

The utility model discloses a following technical scheme realizes:

a coupling premixing water-cooling combustion single-boiler-sheet serial casting aluminum-silicon hot water furnace structure is characterized in that a main body structure is formed by sequentially sealing the front end face and the rear end face of 2-12 axisymmetric single-boiler sheets 1 according to capacity requirements and then serially connecting the single-boiler-sheet serial casting aluminum-silicon hot water furnaces through bolts 4; a front cover plate 5 is arranged at the center of a front boiler piece hearth in the axisymmetric single boiler pieces 1, the front cover plate 5 is connected with a cylindrical flow equalizing pore plate 3 inwards and supported on the annular inner wall surface of the annular water-cooled combustion head 2, the cylindrical flow equalizing pore plate 3 penetrates through the annular water-cooled combustion head 2 of each axisymmetric single boiler piece 1, the front cover plate 5 is connected with a premixer outwards through a connecting elbow 6, and lining heat insulation cover plates 7 are arranged at the pin fin parts of the front boiler piece and the rear boiler piece in the axisymmetric single boiler pieces 1; the top end and the bottom end of the front boiler slice are provided with water side header sealing end covers 8, the center of a hearth of the rear boiler slice is provided with a rear cover plate 12 with a fireproof heat insulation lining, and the bottom end and the top end of the rear boiler slice are respectively provided with a water side inlet header 13 and a water side outlet header 14 for realizing water circulation; the left side and the right side of the main body structure are provided with a detachable ash removal baffle 10 and a sand removal plug 11; the bottom end of the main body structure is provided with a special-shaped smoke box 9;

the front side and the rear side of the outside of the axisymmetric single boiler piece 1 are sequentially divided into a radiation area, a convection area and a condensation area from top to bottom, wherein the center of a combustion chamber of the radiation area is provided with an annular water-cooled combustion head 2 which is integrated with or separated from the axisymmetric single boiler piece 1, the annular water-cooled combustion head 2 comprises an annular water-cooled channel 101, and the surface of the annular water-cooled channel 101 is provided with an anti-backfire rib 102 and a flame stabilizing column 103 in a centrosymmetric manner; circular needle ribs 104 and kidney-shaped needle ribs 106 are regularly arranged outside a combustion chamber, a convection area and a condensation area of the axisymmetric single-boiler slice 1 in a radiation area; the connecting hole seats 108 on the two sides of the bottom of the axisymmetric single boiler piece 1 are used for connecting the special-shaped smoke box 9; the mixed gas of fuel gas and air enters a cylindrical flow equalizing pore plate 3 from a connecting elbow 6, flows through an annular water-cooled combustion head 2 after flow equalizing, is uniformly sprayed out along annular gaps of adjacent axisymmetric single boiler pieces 1 and then is ignited, and is combusted at intervals along the axial direction of an annular cylindrical surface; high-temperature flue gas fills a radiation area around a hearth of the hot water boiler, then the pin fin heating surfaces of a convection area and a condensation area are brushed downwards, the flue gas flows into a special-shaped smoke box 9 from the bottom end of a main structure formed by 2-12 axisymmetric single boiler sheets 1, and the flue gas is converged and turns upwards to be discharged; the axisymmetric single-pot slice 1 is internally provided with a hollow cavity, and backwater enters from a water channel inlet header interface 109 at the bottom end and flows out from a water channel outlet header interface 110 at the top end.

The anti-backfire ribs 102 are of a corn kernel cross-section structure, the distance between every two adjacent anti-backfire ribs 102 is equal along the radial direction after the anti-backfire ribs are arranged along the circumference, the distance is 1-10 mm, the height of each anti-backfire rib 102 is 6-30 mm, and the specific value is to ensure that the average gas ejection speed when the mixed gas passes through the gap is 2-3 m/s; the flame stabilizing columns 103 are positioned outside the anti-backfire ribs 102 and are arranged in a staggered mode with the anti-backfire ribs 102 to stabilize flames, and the heights of the flame stabilizing columns 103 are consistent with those of the anti-backfire ribs 102; the circumferential base ribs 113 are arranged on the periphery of the wall surface of the combustion chamber of the radiation zone, 4-8 hole seats 111 provided with threaded holes are uniformly arranged on the circumferential base ribs 113, and the front pot piece and the rear pot piece in the axisymmetric single pot piece 1 are respectively connected with the front cover plate 5 and the rear cover plate 12 through the hole seats 111.

The axial symmetry single pot slice 1 is different in arrangement mode of the circular needle ribs 104 and the waist circular needle ribs 106 along the smoke flowing direction; the circular pin ribs 104 in the radiation zone are lower in height and larger in diameter and transverse-longitudinal intercept than the circular pin ribs in the convection zone; along with the reduction of the flue gas temperature and the radiation amount along the flue gas flowing direction, the height of the circular needle ribs 104 is gradually increased, the circular needle ribs are arranged in a close staggered regular triangle on a convection zone with the flue gas temperature lower than 500 ℃, and the shortest distance between the ribs is 3-4 mm; in height, the circular needle ribs 104 are equal in height, or are in a staggered design with uniform height of one row or two rows as a group, and the height difference is not more than 1/3 of the average height; in a condensation area with the smoke temperature lower than 65 ℃, circular needle ribs 104 and waist circular needle ribs 106 with the long diameter consistent with the flow direction of smoke are adopted, the short diameter of the waist circular needle ribs 106 is the same as the diameter of the circular needle ribs 104 in the condensation area, and parallel channels among the ribs can provide enough heat exchange area for smoke condensation and ensure the continuous operation of the condensation process; the width of the whole condensation area is gradually reduced along the flowing direction of the flue gas, so that the periphery of the lower half part of the whole axisymmetric single boiler slice 1 is integrally in a U shape.

The hollow cavity in the axisymmetric single-pot piece 1 is a water channel space, the whole water channel space 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 whole water channel space into two parts along the left and right, the distance between every two transverse ribs 116 is unequal to 40-120 mm, and the longitudinal distance between every two adjacent transverse ribs 116 is gradually reduced from bottom to top; water flow turns upwards along a snake shape in the water channel space corresponding to the flue gas condensation area and the convection area until the bottom end of the radiation area; an inclined angle of 0-10 degrees is formed between the transverse rib 116 at the upper part of the convection zone and the horizontal direction, and a steam discharge side hole 114 is processed at the end part; the water channel structure corresponding to the radiation area of the axisymmetric single-pot sheet 1 has two types: a water channel structure is formed by an annular water-cooling channel 101 in the center of a hearth of a radiation area and outer water channels 112 outside an annular base rib 113, namely two sides of the hearth, under the structure, water flow is divided at the bottom end of the radiation area, rises in parallel along two paths of the annular water-cooling channel 101 and a side water channel 112 respectively, and finally is converged and flows out at a water channel outlet header interface 110; in another water channel structure, the outer 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 whole water channel structure is formed by the annular water cooling channel 101, the ascending water channel 119 and the descending water channel 120 together, the descending water flow of the structure does not split at the bottom end of the radiation area, flows leftwards and rightwards to the two side surfaces of the hearth and is turned by 90 degrees to enter the ascending water channel 119, and turns inwards by 180 degrees to enter the descending water channel 120 when going up to the vicinity of the water channel outlet header interface 110, and turns inwards by 90 degrees after reaching the bottom of the hearth and flows to the longitudinal rib 115 of the axially symmetric single boiler piece 1, and then turns upwards by 90 degrees to be merged into the annular water cooling channel 101 to ascend, and finally merged and flows out at the water channel outlet header interface.

The two sides of the axisymmetric single boiler slice 1 are provided with a pair of bolt connecting holes 105, an ash cleaning port 107 and a sand discharging port 117; the bolt connecting holes 105 are used for sequentially sealing the front end face and the rear end face of 2-12 axisymmetric single boiler slices 1 and then connecting the front end face and the rear end face by using bolts 4; the opening degree of the ash cleaning port 107 is ensured to be 1/3-1/2 of the convection zone, so that the sealed furnace body is prevented from being unsealed when ash cleaning is needed in a heating season, and the sealed furnace body is assembled with the detachable ash cleaning baffle 10; the sand discharge port 117 is opposite to the transverse rib 116 in position, directly penetrates into the water channel in depth, and is assembled with the sand discharge plug 11.

The front cover plate 5 and the rear cover plate 12 are similar in integral structure and are manufactured by a set of dies, and the forming method adopts casting or stamping; the front cover plate 5 and the rear cover plate 12 are both of a disc-like structure, and a circumferential opening 501 is formed in the peripheral boundary and used for being connected with the circumferential base rib 113 of the axisymmetric single boiler piece 1; four centripetal supporting ribs 504 are arranged on the inner side of the disc-like structure and are used for supporting the cylindrical flow equalizing pore plate 3; the method for processing the rear cover plate 12 into the front cover plate 5 specifically comprises the following steps: after the rear cover plate 12 is obtained through casting or stamping, the center of the rear cover plate 12 is provided with a hole so as to be placed into the cylindrical flow equalizing pore plate 3, meanwhile, a threaded hole 502 is additionally arranged at the outer end face of the disc-like structure, and an integrated monitoring system 503 comprising an ignition hole, a flame monitoring hole and a pressure monitoring hole is processed or additionally arranged on the surface of the outer end face.

The axisymmetric single pot piece 1 adopts an integral casting process, ZL101, ZL102, ZL104 or AlSi10Mg brand cast aluminum-silicon-magnesium alloy is selected, and a condensation zone of the axisymmetric single pot piece 1 can construct a super-hydrophobic film, so that the film has super-hydrophobicity, self-cleaning property and corrosion resistance, the side wall surface of flue gas is corrosion-resistant, the heat transfer and mass transfer properties are improved, the surface smoothness is improved, and dust accumulation is prevented; the cover plate 7 is made of stainless steel and integrally formed in a punch forming mode; the special-shaped smoke box 9 is made of plastic such as PTFE, PVC, PP or ABS and structurally comprises a dew bearing disc 901 and a smoke exhaust outlet 902, wherein the dew bearing disc 901 is a special-shaped polyhedron, and the local sectional area of the dew bearing disc is gradually reduced along the length direction, the width direction and the height direction, so that the lowest point on the structure is ensured.

When a split structure is adopted between the annular water-cooled combustion head 2 and the axisymmetric single boiler piece 1, the annular water-cooled combustion head 2 is formed by assembling a plurality of water-cooled annular cavities 15, an inlet-outlet independent header 16 and a front end flange 17 together; the main structure of the water-cooling annular cavity 15 comprises an annular water-cooling channel 1501, an anti-tempering fin 1502 and a flame stabilizing rib 1503; the number of the water-cooling annular cavities 15 is the same as that of the axisymmetric single boiler pieces 1, and water inlet and outlet holes 1504 are respectively formed in two sides of the annular inner wall surface of each water-cooling annular cavity 15 and are used for being in butt joint assembly with the independent inlet and outlet header boxes 16, so that independent water circulation in the split structure is realized; the front end of the water-cooling annular cavity 15 matched with the front boiler piece of the axisymmetric single boiler piece 1 is connected with an end flange 17 which is used for connecting with a front cover plate 5 and a connecting elbow 6 of the cast aluminum silicon hot water furnace; meanwhile, two circular arc-shaped flow equalizing pore plates 18 are arranged on the inner wall surface of the water-cooling annular cavity 15, the opening positions of the circular arc-shaped flow equalizing pore plates 18 are right opposite to the gap of the anti-backfire fins 1502, the opening is circular, oval, elliptical or long circular, and the edges of the two circular arc-shaped flow equalizing pore plates 18 are positioned on the upper side and the lower side of the independent inlet and outlet header 16; at this time, after being fully mixed, the mixed gas of the fuel gas and the air is firstly equalized by the arc-shaped equalizing hole plate 18, then passes through the anti-tempering fins 1502 and the flame stabilizing ribs 1503 among the water-cooling annular cavities 15, and finally is evenly sprayed out and ignited to burn at intervals along the circumferential gap of the cylindrical surface.

When a split structure is adopted between the annular water-cooled combustion head 2 and the axisymmetric cast aluminum-silicon single boiler piece 1, the annular water-cooled combustion head 2 is formed by integral and independent casting, and the main body comprises an annular water-cooled space 201, an anti-backfire column 202, a combustion stabilizing column 203 and a header pipe 204; the tempering-preventing columns 202 and the combustion stabilizing columns 203 are symmetrically and uniformly distributed on the surface of the annular water-cooling space 201 in the center, the tempering-preventing columns 202 are of a corn grain section structure, and after being distributed along the circumference, the distance between the two symmetrical tempering-preventing columns 202 is equal along the radial direction, and the distance is 1-10 mm; the height of the tempering-proof column 202 is 6-30 mm, and the specific value is to ensure that the average gas ejection speed when the mixed gas passes through the gap is 2-3 m/s; the flame stabilizing columns 203 are positioned on the outer sides of the anti-backfire columns 202 and are arranged in a staggered mode with the anti-backfire columns 202 to stabilize flame, and the heights of the flame stabilizing columns 203 are consistent with those of the anti-backfire columns 202; the outer section of the header pipe 204 is circular, long circular, elliptical or oval, and the header pipe 204 is divided into a water inlet pipeline 205 and a water outlet pipeline 206 by a middle rib; after entering from the water inlet pipeline 205, the working medium water of the annular water-cooled burner head 2 is distributed to each annular water-cooled space 201, and is collected in the water outlet pipeline 206 after circumferential flowing heat exchange, so that independent water circulation is completed; meanwhile, the inner wall of the annular water-cooled combustion head 2 is provided with a circular arc-shaped flow equalizing pore plate 18, the position of an opening of the circular arc-shaped flow equalizing pore plate 18 is right opposite to the gap of the tempering-preventing column 202, and the opening is circular, oval, elliptical or oblong; at the moment, the mixed gas of the fuel gas and the air is fully mixed, then is firstly equalized by the arc equalizing flow orifice plate 18, then passes through the anti-backfire column 202 and the combustion stabilizing column 203 of the annular water-cooled combustion head 2, and finally is evenly sprayed out and ignited to be combusted at intervals along the circumferential gap of the cylindrical surface.

A coupling premixing water-cooling combustion single-boiler-sheet serial casting aluminum-silicon water heater is formed in a way that the main structure is formed by sequentially sealing the front end face and the rear end face of 2-12 axisymmetric boiler sheets 19 and then serially connecting the boiler sheets by bolts according to capacity requirements; a front end cover plate 22 is arranged in front of a front boiler sheet hearth of the axisymmetric boiler sheets 19, a rectangular flow equalizing pore plate 21 is connected inwards and supported on the inner wall surface of the parallel water-cooled combustion head 20, the rectangular flow equalizing pore plate 21 penetrates through the parallel water-cooled combustion head 20 of each axisymmetric boiler sheet 19, the front end cover plate 22 is outwards connected with a premixer through an elbow 23, and heat insulation plates 24 are arranged at the pin fin parts of the front boiler sheet and the rear boiler sheet in the axisymmetric boiler sheets 19; in addition, the top end and the bottom end of the front boiler slice are provided with inlet and outlet header sealing end covers 25, the center of the hearth of the rear boiler slice is provided with a rear end cover plate 29 of a fireproof heat-insulating lining, and the bottom end and the top end of the rear boiler slice are respectively provided with a water inlet main pipe 30-1 and a water outlet main pipe 30-2 for realizing water circulation; ash removal baffles 27 and plugs 28 are arranged on the left side and the right side of the main body structure; a smoke box 26 is arranged at the bottom end of the main structure; the front side and the rear side of the outside of the axisymmetric boiler piece 19 are sequentially divided into a radiation area, a convection area and a condensation area from top to bottom, wherein the center of a combustion chamber of the radiation area is provided with a parallel water-cooled combustion head 20 which is integrated with the axisymmetric boiler piece 19, the parallel water-cooled combustion head 20 comprises parallel water-cooled channels 1901 on two sides of a central rectangular cross-section cavity 1904, and the surfaces of the parallel water-cooled channels 1901 are provided with anti-tempering ribs 1902 and flame stabilizing fins 1903 in an axisymmetric manner; round pin fins 1905 and kidney-round pin fins 1907 are regularly arranged outside the combustion chamber, in the convection zone and in the condensation zone of the axisymmetric boiler piece 19 in the radiation zone; the bases 1909 on the two sides of the bottom of the axisymmetric pot piece 19 are used for connecting with the smoke box 26; the mixed gas of fuel gas and air enters the rectangular flow equalizing pore plate 21 from the elbow 23, is uniformly sprayed to two sides along the gap of the pot piece through the central rectangular cross-section cavity 1904 after being equalized and then is ignited to burn at intervals along the plane; high-temperature flue gas fills the radiation area around the hearth of the hot water furnace, then the pin fin heating surfaces of the convection area and the condensation area are brushed downwards, the flue gas flows into the smoke box 26 from the bottom end of a main structure formed by 2-12 axisymmetric boiler pieces 19, and the flue gas is converged and turns upwards to be discharged; the axial symmetry pot slice 19 is a hollow cavity inside, and backwater enters from the water channel inlet interface 1910 at the bottom end and flows out from the water channel outlet interface 1911 at the top end.

The anti-backfire ribs 1902 and the flame stabilizing fins 1903 are uniformly distributed on the surfaces of the two parallel water cooling channels 1901 in an axisymmetric mode, the anti-backfire ribs 1902 are of long circular or rectangular cross-section structures, the distance between every two adjacent anti-backfire ribs is 1-10 mm, the height is 6-30 mm, and specific values are selected to ensure that the average gas ejection speed when mixed gas passes through gaps is 2-3 m/s; the flame stabilizing fins 1903 are located outside the anti-backfire ribs 1902 and are arranged in a staggered manner with the anti-backfire ribs 1902 to stabilize flames; circumferential ribs 1913 are arranged on the periphery of the wall surface of a hearth of the combustion chamber of the radiation zone, 4-8 screw hole seats 1914 are uniformly arranged on the circumferential ribs 1913, and a front pot piece and a rear pot piece in the axisymmetric pot pieces 19 are respectively connected with the front end cover plate 22 and the rear end cover plate 29 through the screw hole seats 1914.

The axisymmetric boiler slice 19 is arranged in different ways of the round pin fins 1905 and the waist pin fins 1907 along the smoke flowing direction; the circular pin fins 1905 of the radiant section are lower in height, larger in diameter and larger in transverse and longitudinal intercept than the circular pin fins of the convection section; along with the reduction of the flue gas temperature and the radiation amount along the flue gas flowing direction, the height of the circular pin fins 1905 is gradually increased, the circular pin fins are arranged in a close staggered regular triangle on a convection zone with the flue gas temperature lower than 500 ℃, and the shortest distance between ribs is 3-4 mm; in height, the circular pin fins 1905 are equal in height, or adopt a staggered design of uniform height with one row or two rows as a group, and the height difference is not more than 1/3 of average height; in a condensation area with the smoke temperature lower than 65 ℃, circular pin fins 1905 and waist circular pin fins 1907 with the long diameter consistent with the flow direction of smoke are adopted, the short diameter of the waist circular pin fins 1907 is the same as the diameter of the circular pin fins 1905 in the condensation area, and parallel channels among the ribs can provide enough heat exchange area for smoke condensation, so that the continuous operation of the condensation process is ensured; the width of the whole condensation area is gradually reduced along the flowing direction of the flue gas, so that the periphery of the lower half part of the whole axisymmetric boiler blade 19 is in a U shape integrally.

The hollow cavity in the axisymmetric pot piece 19 is a water channel space, the water channel space is integrally 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 whole water channel space into two parts along the left and right, the distance between every two transverse ribs 1917 is 40-120 mm, the distance between every two transverse ribs 1917 is unequal, from bottom to top, the distances between adjacent transverse ribs 1917 are reduced layer by layer, and the periphery of a hearth in a radiation area is provided with an external water channel 1912; water flow turns upwards along a snake shape in the water channel space corresponding to the flue gas condensation area and the convection area until the bottom end of the radiation area, then is divided at the bottom end of the radiation area, and respectively rises in parallel along two paths of the parallel water cooling channel 1901 and the outer side water channel 1912, and then is converged and flows out at the water channel outlet header interface 1911; an inclined angle of 0-10 degrees is formed between the transverse rib 1917 at the upper part of the convection zone and the horizontal direction, and a steam release hole 1915 is formed in the end part.

The two sides of the axisymmetric pot piece 19 are provided with a pair of connecting holes 1906, ash cleaning grooves 1908 and sand discharging holes 1918; the front end face and the rear end face of 2-12 axisymmetric boiler pieces 19 are aligned and connected in series through a connecting hole 1906; the opening degree of the ash removal groove 1908 is ensured to be 1/3-1/2 of the convection zone, so that the sealed furnace body is prevented from being unsealed when ash removal is needed in a heating season, and the sealed furnace body is assembled with the ash removal baffle 27; the sand discharge holes 1918 are located opposite the transverse ribs 1917, extend directly into the interior of the waterway to the depth, and are assembled with the plugs 28.

The front end cover plate 22 and the rear end cover plate 29 are similar in integral structure and are manufactured through a set of dies, and the forming method adopts casting or stamping; the front end cover plate 22 and the rear end cover plate 29 are both of a disc-like structure, and a circumferential hole 2201 is formed in the peripheral boundary and used for being connected with a circumferential rib 1913 of the axisymmetric boiler piece 19; reinforcing ribs 2204 are arranged on the inner side of the disc-like structure and used for supporting the rectangular flow equalizing pore plate 21; the method for processing the rear end cover plate 29 into the front end cover plate 22 specifically comprises the following steps: after the rear end cover plate 29 is obtained by casting or punching, a rectangular hole is formed in the center of the rear end cover plate 29, a screw hole 2202 is additionally arranged on the outer side end face of the disc-like structure and is positioned on a reinforcing rib 2204, and a monitoring system integrated seat 2203 comprising an ignition hole, a flame monitoring hole and a pressure monitoring hole is machined or additionally arranged on the surface of the outer side end face

A single-boiler-sheet serial-connection cast aluminum-silicon hot water furnace for coupling premixed water-cooling combustion is formed by sequentially sealing the front end face and the rear end face of 2-12 symmetrical single-boiler sheets 31 and then serially connecting the single-boiler sheets with bolts according to the capacity requirement; the two sides of the top of the symmetrical single boiler piece 31 are provided with an isobaric air bin distributor 32; the heat-resistant partition plates 33 are arranged at the pin fin parts of the front and rear boiler sheets of the symmetrical single boiler sheet 31; in addition, the top end and the bottom end of the front boiler slice are provided with header sealing covers 34-1, and the bottom end and the top end of the rear boiler slice are respectively provided with a water inlet main pipeline 37-1 and a water outlet main pipeline 37-2 for realizing water circulation; the left side and the right side of the main structure are provided with an ash removal cover plate 35 and a sealing plug 36; a smoke exhaust box 34-2 is arranged at the bottom end of the main body structure;

the front side and the rear side of the outer part of the symmetrical single-pot piece 31 can be sequentially divided into a radiation area, a convection area and a condensation area from top to bottom; the gas and the air are uniformly and fully mixed from the premixer and then are distributed into the equal-pressure air bin distributors 32 positioned at two sides of the top of the hearth of the symmetrical single boiler piece 31, and are uniformly sprayed along the gap of each symmetrical single boiler piece 31 after being equalized to ignite and burn; the water channels 3101 on two sides of the top of the lower hearth are used as water-cooled combustion heads, and anti-backfire fins 3102 and flame stabilizing ribs 3103 are arranged on the water-cooled combustion heads; the circular ribs 3104 and the kidney circular ribs 3106 are regularly arranged outside the radiant zone combustion chamber, the convection zone and the condensation zone; the bases 3108 on the two sides of the bottom of the symmetrical single-pot piece 31 are used for connecting with a smoke discharging box 34-2; the hearth radiation area becomes a flame radiation space, high-temperature flue gas fills the hearth radiation area, then the needle fin heating surfaces of the convection area and the condensation area are brushed downwards, the flue gas flows into a smoke discharging box 34-2 from the bottom end of a main body structure formed by 2-12 symmetrical single boiler pieces 31, and the flue gas is converged, turns and is discharged upwards; the symmetrical single-pot slice 31 is internally provided with a hollow cavity, and backwater 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 is ignited and combusted; the anti-backfire fins 3102 are in a rectangular or long circular cross section structure, the distance between every two adjacent anti-backfire fins 3102 is 1-10 mm, the height is 6-30 mm, and the specific value is to ensure that the average gas ejection speed when the mixed gas passes through the gap is 2-3 m/s; the flame stabilizing ribs 3103 are positioned outside the anti-backfire fins 3102 and are arranged in a staggered manner with the anti-backfire fins 3102 to stabilize flame, and the height of the flame stabilizing ribs is consistent with that of the anti-backfire fins 3102; a plurality of supporting hole seats 3111 with bolt holes are arranged on both sides of the top end of the symmetrical single-pot plate 31 for connecting with the equal-pressure wind bin distributor 32.

The symmetrical single pot pieces 31 are different in arrangement mode of the circular ribs 3104 and the waist circular ribs 3106 along the smoke flowing direction, the circular ribs 3104 of the radiation area are lower in height and larger in diameter and transverse-longitudinal intercept compared with the circular needle ribs of the convection area, the height of the circular ribs 3104 is gradually increased along with the reduction of smoke temperature and radiation quantity along the smoke flowing direction, the circular ribs 3104 are arranged in a close staggered regular triangle on the convection area with the smoke temperature lower than 500 ℃, and the shortest distance between the circular ribs 3104 is 3-4 mm; the circular ribs 3104 are equal in height, or are in a staggered high-low design with one or two uniform rows, and the height difference should not be greater than the average height 1/3; in a condensation area with the smoke temperature lower than 65 ℃, circular ribs 3104 and kidney-shaped ribs 3106 with the long diameter consistent with the flow direction of smoke are adopted, the short diameter of the kidney-shaped ribs 3106 is the same as that of the circular ribs 3104 of the condensation area, and parallel channels among the ribs can provide enough heat exchange area for smoke condensation, thereby ensuring the continuous operation of the condensation process; the width of the condensation area is gradually reduced along the flowing direction of the flue gas, so that the periphery of the lower half part of the whole symmetrical single boiler piece 31 is in a U shape.

The hollow cavity of the symmetrical single-pot piece 31 is a water channel, the water channel is formed by dividing 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 whole water channel space into two parts along the left and right, the distance between every two straight ribs 3115 is 40-120 mm, the height of the cross section is gradually reduced along with the increase of the overall height, the height of the cross section around the radiation area is about 1/2 of the maximum height of the cross section, and the central rib 3114 and the straight ribs 3115 form a left and right symmetrical snake-shaped water channel 3112; an inclined angle of 0-10 degrees is formed on a straight rib 3115 at the upper part of the convection zone, and a steam discharging hole 3113 is processed at the end part of the straight rib 3115; under the structure, system backwater enters each symmetrical single boiler slice 31, turns and rises along the left and right symmetrical snake-shaped water channels 3112, and finally turns to the water channels 3101 on the two sides of the top of the hearth until the backwater is converged and flows out at the top end outlet 3110.

The two sides of the symmetrical single-pot piece 31 are provided with a pair of front and rear connecting holes 3105, a dust-collecting cleaning hole 3107 and a casting sand discharging hole 3116; the front and rear connecting holes 3105 align and connect the front and rear end faces of 2-12 symmetrical single boiler pieces 31 in series; the opening degree of the ash deposition cleaning port 3107 is ensured to be 1/3-1/2 of the convection zone, so that the sealed furnace body is prevented from being unsealed when ash removal is needed in a heating season, and the sealed furnace body is assembled with the ash removal cover plate 35; the cast sand drain 3116 is positioned opposite the flat rib 3115 and extends deep directly into the channel and is assembled with the seal plug 36.

Compared with the prior art, the utility model has the advantages of as follows:

1. the water-cooling premixed combustion technology and the single-boiler serial connection structure are applied to the cast aluminum silicon condensation heating water heater, and a design scheme capable of simplifying a casting mold, reducing cost and improving product quality and reliability is generated; the partial heat exchange structure of the boiler piece is used as a combustion head of the full-premix water-cooled combustor, so that the combustor and the cast aluminum silicon body heat exchanger are integrated, the heat exchanger is arranged in the combustor, and the combustor is arranged in the heat exchanger

2. The utility model discloses based on water-cooling mixes the burning principle in advance, increased the water-cooling passageway with the different forms in the combustion chamber, can make the flame high temperature that full premix combustor produced taken away rapidly to effectively restrain heating power type NOx's production, cooperation full premix combustor restraines the technical characterstic of fuel type, fast type NOx, can make nitrogen oxide further reduce.

3. The utility model discloses a main part structure symmetry. Based on a set of symmetrical mould, with the design that traditional cast aluminium silicon condensation heating stove needs preceding, well back triplex heating plate can form a complete furnace body, optimize for only needing a general mould can accomplish, not only simplified the production flow, can effective control casting cost simultaneously

4. The utility model discloses a satisfy the large capacity demand, shunt water course design about adopting, therefore heat transfer unit is wideer, and the maximum capacity of condensing boiler than traditional design can improve about 30%. In addition, for each independent water channel, the working medium does not decrease in the whole flowing process, the molding sand can be poured out, the flow distribution is uniform, the phenomenon of heat transfer deterioration caused by supercooling boiling is avoided, and the problem of corrosion caused by the fact that the cold working medium is difficult to remove due to the fact that long-time dry protection is needed in the non-heating period is solved. The header is internally provided with the water tank instead of being externally connected with the water tank, so that the assembly process is further simplified, the sealing workload is reduced, the production efficiency is improved, and the whole condensing boiler is more compact.

5. The utility model discloses adopt local gradual change and prolong the regional two "U" word export design of mainstream at the flue gas convection heating surface, when guaranteeing the even change of velocity of flow, improved unit area's heat transfer intensity, effectively reduced heat transfer area redundancy to condensing boiler weight and cost have been reduced. In addition, the smoke side adopts one to three rows of uniform combined fins in staggered height, the rear half section (condensation heat exchange area) of the convection heating surface is mainly provided with downstream oval pin fins, and parallel channels between the two oval fins can provide enough and continuous condensation space for smoke, so that condensate can be more easily discharged under the carrying of main stream smoke, and the overall heat and mass transfer performance is improved.

Drawings

Fig. 1a is a side view of a single-boiler-slice tandem cast aluminum-silicon hot water boiler of the coupled premixed water-cooled combustion of the present invention.

Fig. 1b is a front view of a single-boiler serial cast aluminum-silicon hot water furnace for coupling premixed water-cooled combustion according to the present invention.

Fig. 2a is an axial side view of the axisymmetric single pot piece of the present invention.

Fig. 2b is a front view of the axisymmetric single pot piece of the present invention.

Fig. 2c is a right side view of the axisymmetric single pot piece of the present invention.

Fig. 2d is a full sectional view of the axisymmetric single-pot piece of the present invention.

Fig. 2e is a full sectional view of another alternative axisymmetric single-pot slice.

FIG. 3 is a schematic view of a water cooling channel of an integrated axisymmetric single pan.

FIG. 4a is an axial view of an axisymmetric single-pan condensation heat transfer zone concurrent flow waist circular pin fin structure.

Fig. 4b is a front view of an axisymmetric single-pan condensation heat transfer zone concurrent flow kidney pin fin structure.

Fig. 5a is a front view of the front cover plate.

Fig. 5b is a rear view of the front cover plate.

Fig. 6a is a front view of the back cover plate.

FIG. 6b is a rear view of the back cover plate

Figure 7a is a front view of a shaped smoke box.

Figure 7b is a right side view of the shaped smoke box.

FIG. 8a is an isometric view of a water-cooled burner head assembled from a water-cooled annular cavity.

FIG. 8b is a front view of the water-cooled burner head assembled from the water-cooled annular cavity.

FIG. 8c is a cross-sectional view A-A of a water-cooled burner head assembled from a water-cooled annular chamber

FIG. 9a is a front view of a water-cooled annular chamber

Fig. 9b is a right side view of the water-cooled annular cavity.

FIG. 9c is a schematic water flow based on A-A section view of the water-cooled annular chamber.

Fig. 10a is an isometric view of an annular water-cooled annular burner head according to the present invention.

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

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

Fig. 10d is a cross-sectional view a-a of the annular water-cooled annular burner head of the present invention.

Fig. 10e is a B-B sectional view of the annular water-cooled annular burner head of the present invention reflecting the water flow process.

Fig. 11a is an axial view of a single-slice tandem casting aluminum-silicon water heater with coupled premixed water-cooled combustion according to the present invention.

Fig. 11b is a front view of a single-slice tandem casting aluminum-silicon water heater with coupled premixed water-cooled combustion according to the present invention.

Fig. 12a is a front view of the axisymmetric pan of the present invention.

Fig. 12b is a left side view of the axisymmetric boiler piece of the present invention.

Fig. 12c is a cross-sectional view of the axisymmetric boiler slice of the present invention.

FIG. 13 is a schematic view of water cooling channels of an axisymmetric pan.

Fig. 14a is a front view of the front cover plate.

Fig. 14b is a rear view of the front cover plate.

Fig. 15a is a front view of the back end cover plate.

FIG. 15b is a rear view of the back end cover plate

Fig. 16a is an axonometric view of a coupled premixed water-cooled combustion single-boiler-slice tandem cast aluminum-silicon hot water furnace assembled by symmetrical single-boiler slices and an isobaric air bin distributor in the utility model.

FIG. 16b is a front view of the aforesaid cast-Al-Si boiler connected in series

Figure 17a is a front view of a symmetrical single pan.

Figure 17b is a right side view of a symmetrical single pan.

Figure 17c is a full cross-sectional view of a symmetrical single-pot slice.

Detailed Description

The invention will be described in further detail with reference to the following figures and specific embodiments:

embodiment 1

As shown in fig. 1a and fig. 1b, the main structure of the single-boiler sheet tandem casting aluminum-silicon hot water furnace structure for coupled premixed water-cooled combustion of the present invention is formed by sequentially sealing the front and rear end faces of 2-12 axisymmetric single-boiler sheets 1 and then connecting the front and rear end faces in series by bolts 4 according to the capacity requirement; a front cover plate 5 is arranged at the center of a front boiler piece hearth in the axisymmetric single boiler pieces 1, the front cover plate 5 is connected with a cylindrical flow equalizing pore plate 3 inwards and supported on the annular inner wall surface of the annular water-cooled combustion head 2, the cylindrical flow equalizing pore plate 3 penetrates through the annular water-cooled combustion head 2 of each axisymmetric single boiler piece 1, the front cover plate 5 is connected with a premixer outwards through a connecting elbow 6, and lining heat insulation cover plates 7 are arranged at the pin fin parts of the front boiler piece and the rear boiler piece in the axisymmetric single boiler pieces 1; the top end and the bottom end of the front boiler slice are provided with water side header sealing end covers 8, the center of a hearth of the rear boiler slice is provided with a rear cover plate 12 with a fireproof heat insulation lining, and the bottom end and the top end of the rear boiler slice are respectively provided with a water side inlet header 13 and a water side outlet header 14 for realizing water circulation; the left side and the right side of the main body structure are provided with a detachable ash removal baffle 10 and a sand removal plug 11; the bottom end of the main structure is provided with a special-shaped smoke box 9.

As shown in fig. 2a, 2b and 2c, the external front and back sides of the axisymmetric single boiler piece 1 are sequentially divided into a radiation zone, a convection zone and a condensation zone from top to bottom, wherein the center of the radiation zone combustion chamber is provided with an annular water-cooled combustion head 2 which is integrated with or separated from the axisymmetric single boiler piece 1, the annular water-cooled combustion head 2 comprises an annular water-cooled channel 101, and the surface of the annular water-cooled channel 101 is provided with an anti-backfire rib 102 and a flame stabilizing column 103 in a centrosymmetric manner; circular needle ribs 104 and kidney-shaped needle ribs 106 are regularly arranged outside a combustion chamber, a convection area and a condensation area of the axisymmetric single-boiler slice 1 in a radiation area; the connecting hole seats 108 on the two sides of the bottom of the axisymmetric single boiler piece 1 are used for connecting the special-shaped smoke box 9; the mixed gas of fuel gas and air enters a cylindrical flow equalizing pore plate 3 from a connecting elbow 6, flows through an annular water-cooled combustion head 2 after flow equalizing, is uniformly sprayed out along annular gaps of adjacent axisymmetric single boiler pieces 1 and then is ignited, and is combusted at intervals along the axial direction of an annular cylindrical surface; high-temperature flue gas fills a radiation area around a hearth of the hot water boiler, then the pin fin heating surfaces of a convection area and a condensation area are brushed downwards, the flue gas flows into a special-shaped smoke box 9 from the bottom end of a main structure formed by 2-12 axisymmetric single boiler sheets 1, and the flue gas is converged and turns upwards to be discharged; the axisymmetric single-pot slice 1 is internally provided with a hollow cavity, and backwater enters from a water channel inlet header interface 109 at the bottom end and flows out from a water channel outlet header interface 110 at the top end.

The two sides of the axisymmetric single boiler slice 1 are provided with a pair of bolt connecting holes 105, an ash cleaning port 107 and a sand discharging port 117; the bolt holes 105 align and serially connect the front end faces and the rear end faces of 2-12 axisymmetric single boiler slices 1 and then connect the front end faces and the rear end faces by bolts 4; the opening degree of the ash cleaning port 107 is ensured to be 1/3-1/2 of the convection zone, so that the sealed furnace body is prevented from being unsealed when ash cleaning is needed in a heating season, and the sealed furnace body is assembled with the detachable ash cleaning baffle 10; the sand discharge port 117 is opposite to the transverse rib 116 in position, directly penetrates into the water channel in depth, and is assembled with the sand discharge plug 11.

As shown in fig. 2d and 3, the anti-backfire ribs 102 are of a corn grain cross-section structure, the distance between every two adjacent anti-backfire ribs 102 is equal along the radial direction after the anti-backfire ribs are arranged along the circumference, the distance is 1-10 mm, the height of each anti-backfire rib 102 is 6-30 mm, and the specific value is to ensure that the average gas ejection speed when the mixed gas passes through the gap is 2-3 m/s; the flame stabilizing columns 103 are positioned outside the anti-backfire ribs 102 and are arranged in a staggered mode with the anti-backfire ribs 102 to stabilize flames, and the heights of the flame stabilizing columns 103 are consistent with those of the anti-backfire ribs 102; the circumferential base ribs 113 are arranged on the periphery of the wall surface of the combustion chamber of the radiation zone, 4-8 hole seats 111 provided with threaded holes are uniformly arranged on the circumferential base ribs 113, and the front pot piece and the rear pot piece in the axisymmetric single pot piece 1 are respectively connected with the front cover plate 5 and the rear cover plate 12 through the hole seats 111.

In addition, the hollow cavity in the axisymmetric single-pot piece 1 is a water channel space, the whole water channel space is divided by a vertical rib 115 and a plurality of horizontal ribs 116, the vertical rib 115 divides the whole water channel space into two parts along the left and right, the distance between every two horizontal ribs 116 is unequal to 40-120 mm, and the longitudinal distance between every two adjacent horizontal ribs 116 is gradually reduced from bottom to top; water flow turns upwards along a snake shape in the water channel space corresponding to the flue gas condensation area and the convection area until the bottom end of the radiation area; an inclined angle of 0-10 degrees is formed between the transverse rib 116 at the upper part of the convection zone and the horizontal direction, and a steam discharge side hole 114 is processed at the end part; the water channel structure corresponding to the radiation zone of the axisymmetric single-boiler piece 1 is formed by the annular water-cooling channel 101 at the center of the radiation zone hearth and the outer water channels 112 at the outer sides of the annular base ribs 113, namely the two sides of the hearth, and under the structure, water flow is divided at the bottom end of the radiation zone, rises in parallel along two paths of the annular water-cooling channel 101 and the side water channels 112 respectively, and finally converges and flows out at the position of the water channel outlet header interface 110.

As shown in fig. 4a and 4b, the axisymmetric single boiler slice 1 has different arrangement modes of the circular needle ribs 104 and the waist-round needle ribs 106 along the smoke flowing direction; the circular pin ribs 104 in the radiation zone are lower in height and larger in diameter and transverse-longitudinal intercept than the circular pin ribs in the convection zone; along with the reduction of the flue gas temperature and the radiation amount along the flue gas flowing direction, the height of the circular needle ribs 104 is gradually increased, the circular needle ribs are arranged in a close staggered regular triangle on a convection zone with the flue gas temperature lower than 500 ℃, and the shortest distance between the ribs is 3-4 mm; in height, the circular needle ribs 104 are equal in height, or are in a staggered design with uniform height of one row or two rows as a group, and the height difference is not more than 1/3 of the average height; in the condensation area with the smoke temperature lower than 65 ℃, the circular needle ribs 104 and the waist circular needle ribs 106 with the long diameter consistent with the smoke flowing direction are adopted, the short diameter of the waist circular needle ribs 106 is the same as the diameter of the circular needle ribs 104 in the condensation area, and the parallel channels among the ribs can provide enough heat exchange area for smoke condensation, thereby ensuring the continuous operation of the condensation process.

As shown in fig. 5a, 5b, 6a and 6b, the front cover plate 5 and the rear cover plate 12 are similar in overall structure and are formed by a set of dies, and the forming method thereof is casting or stamping; the front cover plate 5 and the rear cover plate 12 are both of a disc-like structure, and a circumferential opening 501 is formed in the peripheral boundary and used for being connected with the circumferential base rib 113 of the axisymmetric single boiler piece 1; four centripetal supporting ribs 504 are arranged on the inner side of the disc-like structure and are used for supporting the cylindrical flow equalizing pore plate 3; the method for processing the rear cover plate 12 into the front cover plate 5 specifically comprises the following steps: after the rear cover plate 12 is obtained through casting or stamping, the center of the rear cover plate 12 is provided with a hole so as to be placed into the cylindrical flow equalizing pore plate 3, meanwhile, a threaded hole 502 is additionally arranged at the outer end face of the disc-like structure, and an integrated monitoring system 503 comprising an ignition hole, a flame monitoring hole and a pressure monitoring hole is processed or additionally arranged on the surface of the outer end face.

As shown in fig. 7a and 7b, the special-shaped smoke box 9 is made of plastic, such as PTFE, PVC, PP, ABS, etc., and structurally comprises a dew receiving tray 901 and a smoke exhaust outlet 902, wherein the dew receiving tray 901 is a special-shaped polyhedron, and the local cross-sectional area of the polyhedron is gradually reduced along the length direction, the width direction and the height direction, so as to ensure that the lowest point exists on the structure.

Example II

In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the same description thereof is omitted.

Fig. 2e shows another water channel structure of the radial region of the axisymmetric single-pot sheet 1: the outer 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 whole water channel structure is formed by the annular water cooling channel 101, the ascending water channel 119 and the descending water channel 120 together, the water flow in the structure is not divided at the bottom end of the radiation area, but flows to the two side surfaces of the hearth from left to right and is bent by 90 degrees to enter the ascending water channel 119, and flows to the position near the water channel outlet header interface 110, is bent by 180 degrees inwards to enter the descending water channel 120, and then flows to the position of the longitudinal rib 115 of the axial symmetry single boiler piece 1 after being bent by 90 degrees inwards to be bent by 90 degrees to be merged upwards and merged into the annular water cooling channel 101 to ascend, and finally is merged and flows out at the position of the water channel outlet header.

Example three

In the present embodiment, the same components as those in the first and second embodiments are denoted by the same reference numerals, and the same description thereof is omitted.

Fig. 8a, 8b, 8c, 9a, 9b and 9c together show a split structure between the annular water-cooled burner head 2 and the axisymmetric single-boiler slice 1: the annular water-cooled combustion head 2 is formed by assembling a plurality of water-cooled annular cavities 15, an inlet-outlet independent header 16 and a front end flange 17 together; the main structure of the water-cooling annular cavity 15 comprises an annular water-cooling channel 1501, an anti-tempering fin 1502 and a flame stabilizing rib 1503; the number of the water-cooling annular cavities 15 is the same as that of the axisymmetric single boiler pieces 1, and water inlet and outlet holes 1504 are respectively formed in two sides of the annular inner wall surface of each water-cooling annular cavity 15 and are used for being in butt joint assembly with the independent inlet and outlet header boxes 16, so that independent water circulation in the split structure is realized; the front end of the water-cooling annular cavity 15 matched with the front boiler piece of the axisymmetric single boiler piece 1 is connected with an end flange 17 which is used for connecting with a front cover plate 5 and a connecting elbow 6 of the cast aluminum silicon hot water furnace; meanwhile, two circular arc-shaped flow equalizing pore plates 18 are arranged on the inner wall surface of the water-cooling annular cavity 15, the opening positions of the circular arc-shaped flow equalizing pore plates 18 are right opposite to the gap of the anti-backfire fins 1502, the opening is circular, oval, elliptical or long circular, and the edges of the two circular arc-shaped flow equalizing pore plates 18 are positioned on the upper side and the lower side of the independent inlet and outlet header 16; at this time, after being fully mixed, the mixed gas of the fuel gas and the air is firstly equalized by the arc-shaped equalizing hole plate 18, then passes through the anti-tempering fins 1502 and the flame stabilizing ribs 1503 among the water-cooling annular cavities 15, and finally is evenly sprayed out and ignited to burn at intervals along the circumferential gap of the cylindrical surface.

Example four

In the present embodiment, the same components as those in the first to third embodiments are given the same reference numerals, and the same description will be omitted.

Fig. 10a, 10b, 10c, 10d and 10e show another split structure between the annular water-cooled burner head 2 and the axisymmetric cast aluminum silicon single-pot slice 1: the annular water-cooled combustion head 2 is formed by casting integrally and independently, and the main body comprises an annular water-cooled space 201, an anti-backfire column 202, a combustion stabilizing column 203 and a header pipe 204; the tempering-preventing columns 202 and the combustion stabilizing columns 203 are symmetrically and uniformly distributed on the surface of the annular water-cooling space 201 in the center, the tempering-preventing columns 202 are of a corn grain section structure, and after being distributed along the circumference, the distance between the two symmetrical tempering-preventing columns 202 is equal along the radial direction, and the distance is 1-10 mm; the height of the tempering-proof column 202 is 6-30 mm, and the specific value is to ensure that the average gas ejection speed when the mixed gas passes through the gap is 2-3 m/s; the flame stabilizing columns 203 are positioned on the outer sides of the anti-backfire columns 202 and are arranged in a staggered mode with the anti-backfire columns 202 to stabilize flame, and the heights of the flame stabilizing columns 203 are consistent with those of the anti-backfire columns 202; the outer section of the header pipe 204 is circular, long circular, elliptical or oval, and the header pipe 204 is divided into a water inlet pipeline 205 and a water outlet pipeline 206 by a middle rib; after entering from the water inlet pipeline 205, the working medium water of the annular water-cooled burner head 2 is distributed to each annular water-cooled space 201, and is collected in the water outlet pipeline 206 after circumferential flowing heat exchange, so that independent water circulation is completed; meanwhile, the inner wall of the annular water-cooled combustion head 2 is provided with a circular arc-shaped flow equalizing pore plate 18, the position of an opening of the circular arc-shaped flow equalizing pore plate 18 is right opposite to the gap of the tempering-preventing column 202, and the opening is circular, oval, elliptical or oblong; at the moment, the mixed gas of the fuel gas and the air is fully mixed, then is firstly equalized by the arc equalizing flow orifice plate 18, then passes through the anti-backfire column 202 and the combustion stabilizing column 203 of the annular water-cooled combustion head 2, and finally is evenly sprayed out and ignited to be combusted at intervals along the circumferential gap of the cylindrical surface.

Example five

In the present embodiment, the same components as those in the first to fourth embodiments are given the same reference numerals, and the same description will be omitted.

As shown in fig. 11a and 11b, a single-boiler sheet serial cast aluminum-silicon hot water furnace structure for coupling premixed water-cooled combustion is formed by sequentially sealing the front end surface and the rear end surface of 2-12 axisymmetric boiler sheets 19 and then serially connecting the boiler sheets by bolts according to capacity requirements; a front end cover plate 22 is arranged in front of a front boiler sheet hearth of the axisymmetric boiler sheets 19, a rectangular flow equalizing pore plate 21 is connected inwards and supported on the inner wall surface of the parallel water-cooled combustion head 20, the rectangular flow equalizing pore plate 21 penetrates through the parallel water-cooled combustion head 20 of each axisymmetric boiler sheet 19, the front end cover plate 22 is outwards connected with a premixer through an elbow 23, and heat insulation plates 24 are arranged at the pin fin parts of the front boiler sheet and the rear boiler sheet in the axisymmetric boiler sheets 19; in addition, the top end and the bottom end of the front boiler slice are provided with inlet and outlet header sealing end covers 25, the center of the hearth of the rear boiler slice is provided with a rear end cover plate 29 of a fireproof heat-insulating lining, and the bottom end and the top end of the rear boiler slice are respectively provided with a water inlet main pipe 30-1 and a water outlet main pipe 30-2 for realizing water circulation; ash removal baffles 27 and plugs 28 are arranged on the left side and the right side of the main body structure; at the bottom end of the main structure, a smoke box 26 is provided.

As shown in fig. 12a, 12b and 12c, the front side and the rear side of the exterior of the axisymmetric boiler piece 19 are sequentially divided into a radiation zone, a convection zone and a condensation zone from top to bottom, wherein the center of the radiation zone combustion chamber is provided with a parallel water-cooled combustion head 20 integrated with the axisymmetric boiler piece 19, the parallel water-cooled combustion head 20 comprises parallel water-cooled channels 1901 on two sides of a central rectangular cross-section cavity 1904, and the surfaces of the parallel water-cooled channels 1901 are provided with anti-backfire ribs 1902 and flame stabilizing fins 1903 in an axisymmetric manner; round pin fins 1905 and kidney-round pin fins 1907 are regularly arranged outside the combustion chamber, in the convection zone and in the condensation zone of the axisymmetric boiler piece 19 in the radiation zone; the bases 1909 on the two sides of the bottom of the axisymmetric pot piece 19 are used for connecting with the smoke box 26; the mixed gas of fuel gas and air enters the rectangular flow equalizing pore plate 21 from the elbow 23, is uniformly sprayed to two sides along the gap of the pot piece through the central rectangular cross-section cavity 1904 after being equalized and then is ignited to burn at intervals along the plane; high-temperature flue gas fills the radiation area around the hearth of the hot water furnace, then the pin fin heating surfaces of the convection area and the condensation area are brushed downwards, the flue gas flows into the smoke box 26 from the bottom end of a main structure formed by 2-12 axisymmetric boiler pieces 19, and the flue gas is converged and turns upwards to be discharged; the axial symmetry pot slice 19 is a hollow cavity inside, and backwater enters from the water channel inlet interface 1910 at the bottom end and flows out from the water channel outlet interface 1911 at the top end.

The hollow cavity in the axisymmetric pot piece 19 is a water channel space, the water channel space is integrally 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 whole water channel space into two parts along the left and right, the distance between every two transverse ribs 1917 is 40-120 mm, the distance between every two transverse ribs 1917 is unequal, from bottom to top, the distances between adjacent transverse ribs 1917 are reduced layer by layer, and the outer side water channel 1912 is arranged on the periphery of a hearth in a radiation area; water flow turns upwards along a snake shape in the water channel space corresponding to the flue gas condensation area and the convection area until the bottom end of the radiation area, then is divided at the bottom end of the radiation area, and respectively rises in parallel along two paths of the parallel water cooling channel 1901 and the external water channel 1912, and then is converged and flows out at the water channel outlet header interface 1911; an inclined angle of 0-10 degrees is formed between the transverse rib 1917 at the upper part of the convection zone and the horizontal direction, and a steam release hole 1915 is formed in the end part.

As shown in fig. 13, the anti-backfire ribs 1902 and the flame stabilizing fins 1903 are uniformly distributed on the surfaces of two parallel water cooling channels 1901 in an axisymmetric manner, the anti-backfire ribs 1902 are of an oblong or rectangular cross-section structure, the distance between adjacent anti-backfire ribs is 1-10 mm, the height is 6-30 mm, and the specific value is to ensure that the average gas ejection speed when the mixed gas passes through the gap is 2-3 m/s; the flame stabilizing fins 1903 are located outside the anti-backfire ribs 1902 and are arranged in a staggered manner with the anti-backfire ribs 1902 to stabilize flames; circumferential ribs 1913 are arranged on the periphery of the wall surface of a hearth of the combustion chamber of the radiation zone, 4-8 screw hole seats 1914 are uniformly arranged on the circumferential ribs 1913, and a front pot piece and a rear pot piece in the axisymmetric pot pieces 19 are respectively connected with the front end cover plate 22 and the rear end cover plate 29 through the screw hole seats 1914.

As shown in fig. 14a, 14b, 15a and 15b, the front cover plate 22 and the rear cover plate 29 are similar in overall structure and are formed by a set of dies, and the forming method thereof is casting or stamping; the front end cover plate 22 and the rear end cover plate 29 are both of a disc-like structure, and a circumferential hole 2201 is formed in the peripheral boundary and used for being connected with a circumferential rib 1913 of the axisymmetric boiler piece 19; reinforcing ribs 2204 are arranged on the inner side of the disc-like structure and used for supporting the rectangular flow equalizing pore plate 21; the method for processing the rear end cover plate 29 into the front end cover plate 22 specifically comprises the following steps: after the rear end cover plate 29 is obtained through casting or punching, a rectangular hole is formed in the center of the rear end cover plate 29, a screw hole 2202 is additionally arranged on the outer side end face of the disc-like structure and is positioned on a reinforcing rib 2204, and a monitoring system integrated seat 2203 comprising an ignition hole, a flame monitoring hole and a pressure monitoring hole is machined or additionally arranged on the surface of the outer side end face.

Example six

In this embodiment, the same components as those in the first to fifth embodiments are given the same reference numerals, and the same description will be omitted.

As shown in fig. 16a and 16b, a single-boiler sheet serial cast aluminum-silicon hot water furnace structure for coupling premixed water-cooled combustion is formed by sequentially sealing the front end surface and the rear end surface of 2-12 symmetrical single-boiler sheets 31 and then serially connecting the single-boiler sheets with bolts according to capacity requirements; the two sides of the top of the symmetrical single boiler piece 31 are provided with an isobaric air bin distributor 32; the heat-resistant partition plates 33 are arranged at the pin fin parts of the front and rear boiler sheets of the symmetrical single boiler sheet 31; in addition, the top end and the bottom end of the front boiler slice are provided with header sealing covers 34-1, and the bottom end and the top end of the rear boiler slice are respectively provided with a water inlet main pipeline 37-1 and a water outlet main pipeline 37-2 for realizing water circulation; the left side and the right side of the main structure are provided with an ash removal cover plate 35 and a sealing plug 36; a smoke exhaust box 34-2 is arranged at the bottom end of the main body structure;

as shown in fig. 17a, the front side and the rear side of the exterior of the symmetrical single-pot plate 31 can be sequentially divided into a radiation zone, a convection zone and a condensation zone from top to bottom; the gas and the air are uniformly and fully mixed from the premixer and then are distributed into the equal-pressure air bin distributors 32 positioned at two sides of the top of the hearth of the symmetrical single boiler piece 31, and are uniformly sprayed along the gap of each symmetrical single boiler piece 31 after being equalized to ignite and burn; the water channels 3101 on two sides of the top of the lower hearth are used as water-cooled combustion heads, and anti-backfire fins 3102 and flame stabilizing ribs 3103 are arranged on the water-cooled combustion heads; the circular ribs 3104 and the kidney circular ribs 3106 are regularly arranged outside the radiant zone combustion chamber, the convection zone and the condensation zone; the bases 3108 on the two sides of the bottom of the symmetrical single-pot piece 31 are used for connecting with a smoke discharging box 34-2; the hearth radiation area becomes a flame radiation space, high-temperature flue gas fills the hearth radiation area, then the needle fin heating surfaces of the convection area and the condensation area are brushed downwards, the flue gas flows into a smoke discharging box 34-2 from the bottom end of a main body structure formed by 2-12 symmetrical single boiler pieces 31, and the flue gas is converged, turns and is discharged upwards; the symmetrical single-pot slice 31 is internally provided with a hollow cavity, and backwater enters from the bottom inlet 3109 and flows out from the top outlet 3110.

As shown in fig. 17b, a pair of front and rear connecting holes 3105, a dust-collecting cleaning hole 3107 and a casting sand-discharging hole 3116 are arranged on both sides of the symmetrical single-pot piece 31; the front and rear connecting holes 3105 align and connect the front and rear end faces of 2-12 symmetrical single boiler pieces 31 in series; the opening degree of the ash deposition cleaning port 3107 is ensured to be 1/3-1/2 of the convection zone, so that the sealed furnace body is prevented from being unsealed when ash removal is needed in a heating season, and the sealed furnace body is assembled with the ash removal cover plate 35; the cast sand drain 3116 is positioned opposite the flat rib 3115 and extends deep directly into the channel and is assembled with the seal plug 36.

As shown in fig. 17c, the hollow cavity of the symmetrical single-pot piece 31 is a water channel, the water channel is formed by dividing 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 whole water channel space into two parts along the left and right, the distance between every two straight ribs 3115 is 40-120 mm, the height of the cross section decreases layer by layer along with the increase of the whole height, the height of the cross section around the radiation area is ensured to be about 1/2 of the maximum height of the cross section, and the central rib 3114 and the straight ribs 3115 form a symmetrical serpentine water channel 3112; a straight rib 3115 at the upper part of the convection zone has an inclination angle of 0-10 degrees, and a steam discharging hole 3113 is processed at the end part of the straight rib 3115; under the structure, system backwater enters each symmetrical single boiler slice 31, turns and rises along the left and right symmetrical snake-shaped water channels 3112, and finally turns to the water channels 3101 on the two sides of the top of the hearth until the backwater is converged and flows out at the top end outlet 3110.

Claims

1. A coupling mixes single pot piece series connection of water-cooling burning and casts aluminium silicon hot-water furnace structure, its characterized in that: the main body structure is formed by sequentially sealing the front end face and the rear end face of 2-12 axisymmetric single boiler pieces (1) according to the capacity requirement and then connecting the front end face and the rear end face in series through bolts (4); a front cover plate (5) is arranged at the center of a front boiler piece hearth in the axisymmetric single boiler pieces (1), the front cover plate (5) is connected with a cylindrical flow equalizing pore plate (3) inwards and supported on the annular inner wall surface of the annular water-cooled combustion head (2), the cylindrical flow equalizing pore plate (3) penetrates through the annular water-cooled combustion head (2) of each axisymmetric single boiler piece (1), the front cover plate (5) is connected with a premixer outwards through a connecting elbow (6), and lining heat insulation cover plates (7) are arranged at the pin fin parts of the front boiler piece and the rear boiler piece in the axisymmetric single boiler pieces (1); the top end and the bottom end of the front boiler piece are provided with water side header sealing end covers (8), the center of a hearth of the rear boiler piece is provided with a rear cover plate (12) with a fireproof heat-insulating lining, and the bottom end and the top end of the rear boiler piece are respectively provided with a water side inlet header (13) and a water side outlet header (14) for realizing water circulation; the left side and the right side of the main body structure are provided with a detachable ash removal baffle (10) and a sand discharge plug (11); a special-shaped smoke box (9) is arranged at the bottom end of the main body structure; the front side and the rear side of the outside of the axisymmetric single boiler piece (1) are sequentially divided into a radiation area, a convection area and a condensation area from top to bottom, wherein the center of a combustion chamber of the radiation area is provided with an annular water-cooled combustion head (2) which is integrated with or separated from the axisymmetric single boiler piece (1), the annular water-cooled combustion head (2) comprises an annular water-cooled channel (101), and the surface of the annular water-cooled channel (101) is provided with an anti-backfire rib (102) and a flame stabilizing column (103) in a centrosymmetric manner; circular needle ribs (104) and kidney-shaped needle ribs (106) are regularly arranged at the outer side of a combustion chamber of a radiation area, a convection area and a condensation area of the axisymmetric single-boiler slice (1); the connecting hole seats (108) at two sides of the bottom of the axisymmetric single boiler piece (1) are used for being connected with the special-shaped smoke box (9); the inside of the axisymmetric single-pot piece (1) is a hollow cavity.

2. The structure of the coupled premixed water-cooled combustion single-boiler serial cast aluminum-silicon hot water furnace according to claim 1, characterized in that: the anti-backfire ribs (102) are of a corn grain cross-section structure, the distance between every two adjacent anti-backfire ribs (102) is equal along the radial direction after the anti-backfire ribs are arranged along the circumference, the distance is 1-10 mm, the height of each anti-backfire rib (102) is 6-30 mm, and the specific value is to ensure that the average gas ejection speed when mixed gas passes through the gap is 2-3 m/s; the flame stabilizing columns (103) are positioned on the outer sides of the anti-backfire ribs (102) and are arranged in a staggered mode with the anti-backfire ribs (102) to stabilize flames, and the heights of the flame stabilizing columns (103) are consistent with those of the anti-backfire ribs (102); circumferential base ribs (113) are arranged on the periphery of the wall surface of the combustion chamber of the radiation zone, 4-8 hole seats (111) with threaded holes are uniformly arranged on the circumferential base ribs (113), and a front pot piece and a rear pot piece in the axisymmetric single pot piece (1) are respectively connected with a front cover plate (5) and a rear cover plate (12) through the hole seats (111).

3. The structure of the coupled premixed water-cooled combustion single-boiler serial cast aluminum-silicon hot water furnace according to claim 1, characterized in that: the axisymmetric single-pot slice (1) has different arrangement modes of the circular needle ribs (104) and the waist circular needle ribs (106) along the smoke flowing direction; the circular needle ribs (104) in the radiation zone are lower in height and larger in diameter and transverse-longitudinal intercept compared with the circular needle ribs in the convection zone; along with the reduction of the flue gas temperature and the radiation amount along the flue gas flowing direction, the height of the circular needle ribs (104) is gradually increased, the circular needle ribs are arranged in a close staggered regular triangle on a convection zone with the flue gas temperature lower than 500 ℃, and the shortest distance between the ribs is 3-4 mm; in height, the circular needle ribs (104) are equal in height, or are in a staggered high-low design with one row or two rows being uniform and the height difference is not more than 1/3 of the average height; in a condensation area with the smoke temperature lower than 65 ℃, circular needle ribs (104) and waist circular needle ribs (106) with the long diameter consistent with the flow direction of smoke are adopted, the short diameter of the waist circular needle ribs (106) is the same as the diameter of the circular needle ribs (104) in the condensation area, and parallel channels among the ribs can provide enough heat exchange area for smoke condensation and ensure the continuous operation of the condensation process; the width of the whole condensation area is gradually reduced along the flowing direction of the flue gas, so that the periphery of the lower half part of the whole axisymmetric single boiler slice (1) is integrally in a U shape.

4. The structure of the coupled premixed water-cooled combustion single-boiler serial cast aluminum-silicon hot water furnace according to claim 1, characterized in that: the inner hollow cavity of the axisymmetric single-pot piece (1) is a water channel space, the whole water channel space 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 whole water channel space into two parts along the left and right, the distance between every two transverse ribs (116) is unequal to 40-120 mm, and from bottom to top, the longitudinal distance between every two adjacent transverse ribs (116) is reduced layer by layer; water flow turns upwards along a snake shape in the water channel space corresponding to the flue gas condensation area and the convection area until the bottom end of the radiation area; an inclined angle of 0-10 degrees is formed between a cross rib (116) at the upper part of the convection zone and the horizontal direction, and a steam discharge side hole (114) is processed at the end part; the water channel structures corresponding to the radiation areas of the axisymmetric single-boiler sheet (1) are two types: a water channel structure is formed by an annular water cooling channel (101) at the center of a hearth of a radiation area and outer water channels (112) at the outer sides of annular base ribs (113), namely the two sides of the hearth; in another water channel structure, an outer 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 whole water channel structure is jointly formed by the annular water cooling channel (101), the ascending water channel (119) and the descending water channel (120).

5. The structure of the coupled premixed water-cooled combustion single-boiler serial cast aluminum-silicon hot water furnace according to claim 1, characterized in that: the two sides of the axisymmetric single boiler piece (1) are provided with a pair of bolt connecting holes (105), an ash cleaning port (107) and a sand discharging port (117); the front end face and the rear end face of 2-12 axisymmetric single boiler pieces (1) are sequentially sealed by the bolt connecting holes (105) and then connected by bolts (4); the opening degree of the ash cleaning port (107) ensures that 1/3-1/2 of the convection zone can be cleaned, the sealed furnace body is prevented from being unsealed when ash cleaning is needed in a heating season, and the sealed furnace body is assembled with the detachable ash cleaning baffle (10); the sand discharge port (117) is opposite to the transverse rib (116) in position, directly penetrates into the water channel in depth, and is assembled with the sand discharge plug (11).

6. The structure of the coupled premixed water-cooled combustion single-boiler serial cast aluminum-silicon hot water furnace according to claim 1, characterized in that: the front cover plate (5) and the rear cover plate (12) are similar in integral structure and are manufactured by a set of dies, and the forming method adopts casting or stamping; the front cover plate (5) and the rear cover plate (12) are both of a disc-like structure, and a circumferential opening (501) is formed in the peripheral boundary and used for being connected with a circumferential base rib (113) of the axisymmetric single boiler piece (1); four centripetal supporting ribs (504) are arranged on the inner side of the disc-like structure and are used for supporting the cylindrical flow equalizing hole plate (3); the method for processing the rear cover plate (12) into the front cover plate (5) specifically comprises the following steps: after a rear cover plate (12) is obtained through casting or stamping, a hole is formed in the center of the rear cover plate (12) so as to be conveniently placed into a cylindrical flow equalizing pore plate (3), meanwhile, a threaded hole (502) is additionally formed in the outer end face of the disc-like structure, and an integrated monitoring system (503) comprising an ignition hole, a flame monitoring hole and a pressure monitoring hole is machined or additionally arranged on the surface of the outer end face.

7. The structure of the coupled premixed water-cooled combustion single-boiler serial cast aluminum-silicon hot water furnace according to claim 1, characterized in that: the axisymmetric single pot piece (1) adopts an integral casting process, ZL101, ZL102, ZL104 or AlSi10Mg brand cast aluminum-silicon-magnesium alloy is selected, and a condensation zone of the axisymmetric single pot piece (1) can construct a super-hydrophobic film, so that the film has super-hydrophobicity, self-cleaning property and corrosion resistance, the side wall surface of flue gas is corrosion-resistant, the heat transfer and mass transfer properties are improved, the surface smoothness is improved, and dust accumulation is prevented; the cover plate (7) is made of stainless steel and integrally formed in a punch mode; the special-shaped smoke box (9) is made of plastics such as PTFE (polytetrafluoroethylene), PVC (polyvinyl chloride), PP (polypropylene) or ABS (acrylonitrile butadiene styrene) and structurally comprises a dew bearing disc (901) and a smoke exhaust outlet (902), wherein the dew bearing disc (901) is a special-shaped polyhedron, and the local sectional area of the dew bearing disc is gradually reduced along the length direction, the width direction and the height direction, so that the lowest point on the structure is ensured.

8. The structure of the coupled premixed water-cooled combustion single-boiler serial cast aluminum-silicon hot water furnace 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 piece (1), the annular water-cooled combustion head (2) is formed by assembling a plurality of water-cooled annular cavities (15), independent inlet and outlet headers (16) and a front end flange plate (17); the main structure of the water-cooling annular cavity (15) comprises an annular water-cooling channel (1501), anti-tempering fins (1502) and flame stabilizing ribs (1503); the number of the water-cooling annular cavities (15) is the same as that of the axisymmetric single-boiler pieces (1), and water inlet and outlet holes (1504) are respectively formed in two sides of the annular inner wall surface of each water-cooling annular cavity (15) and are used for being in butt joint assembly with the independent inlet and outlet header (16), so that independent water circulation inside the split structure is realized; the front end of a water-cooling annular cavity (15) matched with the front boiler piece of the axisymmetric single boiler piece (1) is connected with an end flange (17) which is used for connecting a front cover plate (5) and a connecting elbow (6) of the cast aluminum silicon hot water furnace; meanwhile, two circular arc-shaped flow equalizing pore plates (18) are arranged on the inner wall surface of the water-cooling annular cavity (15), the positions of openings of the circular arc-shaped flow equalizing pore plates (18) are right opposite to the gap of the anti-backfire fins (1502), the openings are circular, oval, elliptical or long circular, and the edges of the two circular arc-shaped flow equalizing pore plates (18) are positioned on the upper side and the lower side of the independent inlet and outlet header (16).

9. The structure of the coupled premixed water-cooled combustion single-boiler serial cast aluminum-silicon hot water furnace 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 piece (1), the annular water-cooled combustion head (2) is formed by casting integrally and independently, and the main body comprises an annular water-cooled space (201), an anti-backfire column (202), a combustion stabilizing column (203) and a header main pipe (204); the tempering-preventing columns (202) and the combustion stabilizing columns (203) are symmetrically and uniformly distributed on the surface of the annular water-cooling space (201) in a central mode, the tempering-preventing columns (202) are of a corn grain section structure, and after the tempering-preventing columns (202) are distributed along the circumference, the distance between the two symmetrical tempering-preventing columns (202) is equal along the radial direction everywhere, and the distance is 1-10 mm; the height of the tempering-proof column (202) is 6-30 mm, and the specific value is to ensure that the average gas ejection speed when the mixed gas passes through the gap is 2-3 m/s; the flame stabilizing columns (203) are positioned on the outer sides of the anti-backfire columns (202) and are arranged in a staggered mode with the anti-backfire columns (202) to stabilize flame, and the heights of the flame stabilizing columns (203) are consistent with those of the anti-backfire columns (202); the outer section of the header main pipe (204) is circular, long circular, oval or oval, and the header main pipe (204) is divided into a water inlet pipeline (205) and a water outlet pipeline (206) by a middle rib; meanwhile, the inner wall of the annular water-cooled combustion head (2) is provided with a circular arc-shaped flow equalizing pore plate (18), the position of an opening of the circular arc-shaped flow equalizing pore plate (18) is right opposite to the gap of the tempering-preventing column (202), and the opening is circular, oval, elliptical or oblong.

10. A coupling mixes single pot piece series connection of water-cooling burning and casts aluminium silicon hot-water furnace structure, its characterized in that: the main body structure is formed by sequentially sealing the front end face and the rear end face of 2-12 axisymmetric boiler pieces (19) according to the capacity requirement and then connecting the boiler pieces in series by bolts; a front end cover plate (22) is arranged in front of a front boiler piece hearth of the axisymmetric boiler pieces (19), a rectangular flow equalizing pore plate (21) is connected inwards and supported on the inner wall surface of the parallel water-cooled combustion head (20), the rectangular flow equalizing pore plate (21) penetrates through the parallel water-cooled combustion head (20) of each axisymmetric boiler piece (19), the front end cover plate (22) is outwards connected with a premixer through an elbow (23), and heat insulation plates (24) are arranged at the pin fin parts of the front boiler piece and the rear boiler piece in the axisymmetric boiler pieces (19); in addition, the top end and the bottom end of the front boiler piece are provided with inlet and outlet header sealing end covers (25), the center of the hearth of the rear boiler piece is provided with a rear end cover plate (29) of a fireproof heat-insulating lining, and the bottom end and the top end of the rear boiler piece are respectively provided with a water inlet main pipe (30-1) and a water outlet main pipe (30-2) for realizing water circulation; ash removal baffles (27) and plugs (28) are arranged on the left side and the right side of the main body structure; a smoke box (26) is arranged at the bottom end of the main body structure; the front side and the rear side of the outside of the axisymmetric boiler piece (19) are sequentially divided into a radiation area, a convection area and a condensation area from top to bottom, wherein a parallel water-cooling combustion head (20) which is integrated with the axisymmetric boiler piece (19) is arranged at the center of a combustion chamber of the radiation area, the parallel water-cooling combustion head (20) comprises parallel water-cooling channels (1901) on two sides of a cavity (1904) with a central rectangular cross section, and tempering-preventing ribs (1902) and flame-stabilizing fins (1903) are arranged on the surface of the parallel water-cooling channels (1901) in an axisymmetric manner; round pin fins (1905) and kidney round pin fins (1907) are regularly arranged on the outer side of a combustion chamber, a convection area and a condensation area of the axisymmetric boiler piece (19) in a radiation area; the bases (1909) at the two sides of the bottom of the axisymmetric boiler piece (19) are used for being connected with the smoke box (26); the inner part of the axisymmetric pot piece (19) is a hollow cavity.

11. The structure of the coupled premixed water-cooled combustion single-boiler serial cast aluminum-silicon hot water furnace according to claim 10, characterized in that: the anti-backfire ribs (1902) and the flame stabilizing fins (1903) are uniformly distributed on the surfaces of the two parallel water cooling channels (1901) in an axisymmetric mode, the anti-backfire ribs (1902) are of long circular or rectangular cross section structures, the distance between every two adjacent anti-backfire ribs is 1-10 mm, the height is 6-30 mm, and specific values are selected to ensure that the average gas ejection speed when the mixed gas passes through the gap is 2-3 m/s; the flame stabilizing fins (1903) are positioned on the outer side of the anti-tempering ribs (1902) and are arranged in a staggered manner with the anti-tempering ribs (1902) to stabilize flame; circumferential ribs (1913) are arranged on the periphery of the wall surface of a hearth of the combustion chamber of the radiation zone, 4-8 screw hole seats (1914) are uniformly arranged on the circumferential ribs (1913), and a front pot piece and a rear pot piece in the axisymmetric pot pieces (19) are respectively connected with a front end cover plate (22) and a rear end cover plate (29) through the screw hole seats (1914).

12. The structure of the coupled premixed water-cooled combustion single-boiler serial cast aluminum-silicon hot water furnace according to claim 10, characterized in that: the axisymmetric boiler piece (19) has different arrangement modes of the round pin fins (1905) and the waist round pin fins (1907) along the smoke flowing direction; the circular pin fins (1905) of the radiant section are lower in height and larger in diameter and transverse-longitudinal intercept than the circular pin fins of the convection section; along with the reduction of the flue gas temperature and the radiation amount along the flow direction of the flue gas, the height of the circular pin fins (1905) is gradually increased, the circular pin fins are arranged in a close staggered regular triangle on a convection zone with the flue gas temperature lower than 500 ℃, and the shortest distance between ribs is 3-4 mm; in height, the circular pin fins (1905) are equal in height, or are in a staggered high-low design with one row or two rows being uniform and the height difference is not greater than 1/3 with average height; in a condensation area with the smoke temperature lower than 65 ℃, circular pin fins (1905) and waist circular pin fins (1907) with the long diameter consistent with the flow direction of smoke are adopted, the short diameter of the waist circular pin fins (1907) is the same as the diameter of the circular pin fins (1905) in the condensation area, and parallel channels among ribs can provide enough heat exchange area for smoke condensation, so that the continuous operation of the condensation process is ensured; the width of the whole condensation area is gradually reduced along the flowing direction of the flue gas, so that the periphery of the lower half part of the whole axisymmetric boiler slice (19) is integrally in a U shape.

13. The structure of the coupled premixed water-cooled combustion single-boiler serial cast aluminum-silicon hot water furnace according to claim 10, characterized in that: the inner hollow cavity of the axisymmetric pot piece (19) is a water channel space, the water channel space is integrally divided by a longitudinal rib (1916) in the vertical direction and a plurality of transverse ribs (1917) in the horizontal direction, the longitudinal rib (1916) divides the whole water channel space into two parts along the left and right, the distance between every two transverse ribs (1917) is unequal to 40-120 mm, the distance between every two transverse ribs (1917) is gradually reduced from bottom to top, and an outer water channel (1912) is arranged on the periphery of a hearth of a radiation area; an inclined angle of 0-10 degrees is formed between the transverse rib (1917) at the upper part of the convection zone and the horizontal direction, and a steam release hole (1915) is formed in the end part.

14. The structure of the coupled premixed water-cooled combustion single-boiler serial cast aluminum-silicon hot water furnace according to claim 10, characterized in that: the two sides of the axisymmetric boiler piece (19) are provided with a pair of connecting holes (1906), ash cleaning grooves (1908) and sand discharging holes (1918); the front end face and the rear end face of 2-12 axisymmetric boiler pieces (19) are aligned and connected in series through the connecting holes (1906); the opening degree of the ash removal groove (1908) ensures that 1/3-1/2 of the convection zone can be cleaned, the sealed furnace body is prevented from being unsealed when ash removal is needed in a heating season, and the sealed furnace body is assembled with an ash removal baffle (27); the sand discharge hole (1918) is positioned opposite the transverse rib (1917), extends in depth directly into the interior of the waterway and is fitted with a plug (28).

15. The structure of the coupled premixed water-cooled combustion single-boiler serial cast aluminum-silicon hot water furnace according to claim 10, characterized in that: the front end cover plate (22) and the rear end cover plate (29) are similar in integral structure and are manufactured by a set of dies, and the forming method adopts casting or stamping; the front end cover plate (22) and the rear end cover plate (29) are both of disc-like structures, and a circumferential hole (2201) is formed in the peripheral boundary and used for being connected with a circumferential rib (1913) of the axisymmetric pot piece (19); reinforcing ribs (2204) are arranged on the inner side of the disc-like structure and used for supporting the rectangular flow equalizing pore plate (21); the method for processing the rear end cover plate (29) into the front end cover plate (22) specifically comprises the following steps: after a rear end cover plate (29) is obtained through casting or punching, a rectangular hole is formed in the center of the rear end cover plate (29), meanwhile, a screw hole (2202) is additionally arranged on the outer side end face of the disc-like structure and is positioned on a reinforcing rib (2204), and a monitoring system integrated seat (2203) comprising an ignition hole, a flame monitoring hole and a pressure monitoring hole is machined or additionally arranged on the surface of the outer side end face.

16. A coupling mixes single pot piece series connection of water-cooling burning and casts aluminium silicon hot-water furnace structure, its characterized in that: the main body structure is formed by sequentially sealing the front end face and the rear end face of 2-12 symmetrical single boiler pieces (31) and then connecting the front end face and the rear end face in series through bolts according to the capacity requirement; equipressure wind bin distributors (32) are arranged on two sides of the top of the symmetrical single boiler piece (31); the heat-resistant partition plates (33) are arranged at the pin fin parts of the front boiler piece and the rear boiler piece of the symmetrical single boiler piece (31); in addition, the top end and the bottom end of the front boiler piece are provided with a header sealing cover (34-1), and the bottom end and the top end of the rear boiler piece are respectively provided with a water inlet main pipeline (37-1) and a water outlet main pipeline (37-2) for realizing water circulation; the left side and the right side of the main body structure are provided with an ash removal cover plate (35) and a sealing plug (36); a smoke exhaust box (34-2) is arranged at the bottom end of the main body structure;

the front side and the rear side of the outside of the symmetrical single-pot piece (31) can be sequentially divided into a radiation area, a convection area and a condensation area from top to bottom; the gas and the air are uniformly and fully mixed from the premixer and then are distributed and sent into an isobaric air bin distributor (32) positioned at two sides of the top of the hearth of the symmetrical single boiler sheet (31), and after being equalized, the gas and the air are uniformly sprayed along the gap of each symmetrical single boiler sheet (31) for ignition and combustion; the water channels (3101) on two sides of the top of the lower hearth are used as water-cooled combustion heads, and anti-backfire fins (3102) and flame stabilizing ribs (3103) are arranged on the water-cooled combustion heads; round ribs (3104) and kidney-round ribs (3106) are regularly arranged outside the radiant zone combustion chamber, the convection zone and the condensation zone; the bases (3108) on two sides of the bottom of the symmetrical single-pot piece (31) are used for being connected with a smoke discharging box (34-2); the inner part of the symmetrical single-pot sheet (31) is a hollow cavity.

17. The structure of the coupled premixed water-cooled combustion single-boiler serial cast aluminum-silicon hot water furnace according to claim 16, wherein: the mixed gas flows through the anti-backfire fins (3102) and the flame stabilizing ribs (3103) and then is ignited and combusted; the anti-backfire fins (3102) are of rectangular or long circular cross-section structures, the distance between every two adjacent anti-backfire fins (3102) is 1-10 mm, the height is 6-30 mm, and specific values are selected to ensure that the average gas ejection speed when the mixed gas passes through the gap is 2-3 m/s; the flame stabilizing ribs (3103) are positioned at the outer sides of the anti-backfire fins (3102) and are arranged in a staggered way with the anti-backfire fins (3102) to stabilize flame, and the height of the flame stabilizing ribs is consistent with that of the anti-backfire fins (3102); a plurality of supporting hole seats (3111) with bolt holes are arranged on two sides of the top end of the symmetrical single-pot sheet (31) and are used for being connected with an isobaric air bin distributor (32).

18. The structure of the coupled premixed water-cooled combustion single-boiler serial cast aluminum-silicon hot water furnace according to claim 16, wherein: the symmetrical single-boiler slice (31) is characterized in that the arrangement modes of the circular ribs (3104) and the waist circular ribs (3106) are different along the smoke flowing direction, the circular ribs (3104) in the radiation area are lower in height and larger in diameter and transverse-longitudinal intercept compared with the circular needle ribs in the convection area, the height of the circular ribs (3104) is gradually increased along with the reduction of the smoke temperature and the radiation quantity along the smoke flowing direction, the circular ribs (3104) are arranged in a tight staggered regular triangle on the convection area with the smoke temperature lower than 500 ℃, and the shortest distance between the circular ribs (3104) is 3-4 mm; the circular ribs (3104) are equal in height, or are in a staggered high-low design with one or two uniform rows, and the height difference is not larger than 1/3; in a condensation area with the smoke temperature lower than 65 ℃, circular ribs (3104) and kidney-shaped ribs (3106) with the long diameter consistent with the flow direction of smoke are adopted, the short diameter of the kidney-shaped ribs (3106) is the same as that of the circular ribs (3104) of the condensation area, and parallel channels among the ribs can provide enough heat exchange area for smoke condensation, thereby ensuring the continuous operation of the condensation process; the width of the condensation area is gradually reduced along the flowing direction of the flue gas, so that the periphery of the lower half part of the whole symmetrical single boiler slice (31) is in a U shape.

19. The structure of the coupled premixed water-cooled combustion single-boiler serial cast aluminum-silicon hot water furnace according to claim 16, wherein: the inner hollow cavity of the symmetrical single pot piece (31) is a water channel, the water channel is formed by dividing a central rib (3114) in the vertical direction and a plurality of straight ribs (3115) in the horizontal direction, the central rib (3114) divides the whole water channel space into two parts along the left and right, the distance between every two straight ribs (3115) is 40-120 mm, the height of the cross section is gradually reduced along with the increase of the overall height, the height of the cross section around a radiation area is ensured to be about 1/2 of the maximum height of the cross section, and the central rib (3114) and the straight ribs (3115) form a left and right symmetrical snake-shaped water channel (3112); the straight rib (3115) at the upper part of the convection zone has an inclination angle of 0-10 degrees, and the end part of the straight rib is provided with a steam discharging hole (3113).

20. The structure of the coupled premixed water-cooled combustion single-boiler serial cast aluminum-silicon hot water furnace according to claim 16, wherein: the two sides of the symmetrical single boiler piece (31) are provided with a pair of front and rear connecting holes (3105), a dust-deposition cleaning opening (3107) and a casting sand discharge opening (3116); the front and rear connecting holes (3105) align and connect the front and rear end faces of 2-12 symmetrical single boiler pieces (31) in series; the opening degree of the dust-collecting cleaning opening (3107) ensures that 1/3-1/2 of the convection zone can be cleaned, the sealed furnace body is prevented from being unsealed when dust is required to be cleaned in a heating season, and the sealed furnace body is assembled with a dust-cleaning cover plate (35); the casting sand discharge port (3116) is opposite to the straight rib (3115) in position, directly penetrates into the water channel in depth, and is assembled with the sealing plug (36).