A low nitrogen and high efficiency condensing boiler

Abstract

The present invention discloses a low-nitrogen high-efficiency condensing boiler, comprising an outer shell and a boiler body; the boiler body comprises a vertical cylinder, an upper end plate with a middle opening is fixedly arranged on the top of the vertical cylinder, and a lower tube plate is fixedly arranged on the bottom of the vertical cylinder; a furnace is arranged on the upper inner side of the vertical cylinder; a full premixed combustion assembly is arranged on the top of the furnace, an upper tube plate is fixedly arranged on the bottom of the furnace, and a plurality of vertical smoke pipes are fixedly arranged on the upper tube plate; a base is arranged at the bottom of the boiler body, a smoke exhaust cavity is arranged in the base, and a smoke exhaust pipe and a condensate outlet are arranged on one side of the smoke exhaust cavity; a water inlet and a sewage outlet are arranged on the lower part of the side wall of the vertical cylinder; and a water outlet is arranged on the upper part of the side wall of the vertical cylinder. The positions of the water inlet and the water outlet in the present invention are arranged so that the water flows from bottom to top; the arrangement of the full premixed combustion assembly, the furnace, and the vertical smoke pipe makes the smoke flow from top to bottom; thus, the water and the smoke present a countercurrent heat exchange effect, and sufficient and efficient heat exchange between the smoke and water is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of boilers, and in particular relates to a low-nitrogen and high-efficiency condensing boiler. Background Art

[0002] A boiler is an energy conversion device. The energy input to the boiler includes chemical energy and electrical energy in the fuel, and the boiler outputs steam, high-temperature water or organic heat carrier with a certain amount of thermal energy. With the increasingly stringent environmental protection requirements, gas boilers are more and more widely used.

[0003] However, the existing gas boilers still have the following defects: the design of the boiler body and the smoke pipe in the existing boilers makes the heat exchange effect between the flue gas and water in the furnace poor; the two heat exchange media in the existing boilers mostly flow in the same direction, which leads to a high flue gas outlet temperature and fails to absorb the latent heat of vaporization in the flue gas, and fails to achieve efficient heat exchange. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art and provide a low-nitrogen and high-efficiency condensing boiler.

[0005] To achieve the above object, the present invention adopts the following technical solution:

[0006] A low-nitrogen high-efficiency condensing boiler comprises an outer shell and a boiler body located inside the outer shell;

[0007] The boiler body comprises a vertical cylinder, an upper end plate with a middle opening is fixedly arranged on the top of the vertical cylinder, and a lower tube plate is fixedly arranged on the bottom of the vertical cylinder;

[0008] A furnace is arranged on the inner upper part of the vertical cylinder;

[0009] A full premixed combustion assembly is arranged on the top of the furnace, an upper tube plate is fixedly arranged on the bottom of the furnace, and a plurality of vertical smoke pipes connected to the inner cavity of the furnace are fixedly arranged on the upper tube plate; the bottom of the vertical smoke pipe is fixedly connected to the lower tube plate;

[0010] A base is provided at the bottom of the boiler body, a smoke exhaust cavity connected to the vertical smoke pipe is provided in the base, a smoke exhaust pipe and a condensate outlet are provided on one side of the smoke exhaust cavity, and the smoke exhaust pipe is located above the condensate outlet;

[0011] A water inlet and a sewage outlet are arranged at the lower part of the side wall of the vertical cylinder, and the sewage outlet is located below the water inlet; and a water outlet is arranged at the upper part of the side wall of the vertical cylinder.

[0012] Preferably, a forklift opening is provided on one side of the base.

[0013] Preferably, the bottom plate of the smoke exhaust cavity is in an inclined state, and the smoke exhaust pipe and the condensation water outlet are arranged at the inclined lower end of the bottom plate.

[0014] Preferably, a spoiler is provided inside the vertical smoke pipe to promote smoke to flow in a spiral direction, and the spoiler extends from the inner upper part of the vertical smoke pipe to the bottom;

[0015] The two side surfaces of the spoiler are two parallel spiral surfaces; two spiral smoke flow channels are formed between the two spiral surfaces of the spoiler and the inner wall of the vertical smoke pipe.

[0016] Preferably, the radial cross-section of the spoiler is a rectangular structure.

[0017] Preferably, the furnace core comprises a main furnace core, and an auxiliary furnace core is coaxially arranged on the upper part of the main furnace core;

[0018] The diameter of the auxiliary furnace is smaller than the diameter of the main furnace;

[0019] The top of the auxiliary furnace is fixedly connected to the side wall of the middle opening of the upper end plate of the vertical cylinder.

[0020] Preferably, the main furnace core is a corrugated furnace core.

[0021] Preferably, a partition is provided at the lower part of the upper tube plate, the side wall of the partition is fixedly connected to the inner wall of the vertical cylinder, and the partition is connected to the bottom of the upper tube plate through three connecting blocks evenly distributed along the circumferential direction;

[0022] The partition is provided with through holes corresponding to each vertical smoke tube one by one and for the corresponding vertical smoke tube to pass through, and an annular channel is formed between the side wall of the through hole and the outer side wall of the corresponding vertical smoke tube.

[0023] Preferably, the full premixed combustion assembly includes a fan, the inlet of the fan is connected to one end of a venturi tube, the other end of the venturi tube is connected to an air duct, and an air filter is provided on the air duct; the venturi tube is also connected to a gas pipeline, and a natural gas filter, a gas valve, and a diaphragm pressure gauge are provided on the gas pipeline; the outlet of the fan is connected to a burner, and the combustion head of the burner is located in the furnace.

[0024] Preferably, the outer shell includes a frame in a rectangular parallelepiped structure and a box plate located outside the frame;

[0025] The frame includes a first positioning column, a first column, a second positioning column, and a second column; the height of the first column is greater than that of the first positioning column, and the height of the second column is greater than that of the second positioning column;

[0026] There are four first positioning columns, which are respectively arranged at the four corners of the top surface of the base. The bottom ends of the first positioning columns are fixedly connected to the top surface of the base. Each first positioning column is connected to the lower end of the corresponding first column by a self-tapping screw.

[0027] Second positioning columns are arranged between the first positioning columns distributed along the length direction of the base, and the bottom ends of the second positioning columns are fixedly connected to the top surface of the base; each second positioning column is connected to the lower end of the corresponding second column by a self-tapping screw;

[0028] A plurality of beams are arranged between adjacent first columns along the height direction, and through holes for corresponding beams to pass through are arranged on the second columns; the highest beam is located on the top of the first column; the beam is connected to the first column by self-tapping screws;

[0029] A top beam is arranged on the top of the two second columns; both ends of the top beam are connected to the corresponding cross beams by self-tapping screws;

[0030] A plurality of square holes are arranged on the end surfaces facing outwards of the first column, the second column, the cross beam and the top beam;

[0031] The box panels located on the side and top of the frame are connected to the corresponding parts of the frame by a number of screws;

[0032] A snap nut is arranged in the square hole corresponding to the corresponding screw.

[0033] The beneficial effects of the present invention are:

[0034] (1) The positions of the water inlet and the water outlet in the present invention are arranged so that the water flows from bottom to top; and the arrangement of the full premixed combustion assembly, the furnace, and the vertical smoke pipe makes the flue gas flow from top to bottom; thereby, the water and the flue gas exhibit a countercurrent heat exchange effect, wherein the high-temperature flue gas exchanges heat with the high-temperature water moving to the upper part of the vertical cylinder, and the low-temperature flue gas exchanges heat with the low-temperature water at the lower part of the vertical cylinder, thereby achieving a completely countercurrent heat exchange effect, and realizing a fully efficient heat exchange between the flue gas and the water.

[0035] (2) The vertical smoke pipe of the present invention is provided with spoilers, so that the smoke in the vertical smoke pipe flows in a spiral shape, which not only increases the flow distance of the smoke, but also disturbs the smoke, thereby enhancing the heat transfer effect of the smoke and significantly increasing the heat exchange efficiency. The heat exchange efficiency can reach 2 to 3 times the heat exchange efficiency of a bare pipe under the same conditions.

[0036] (3) The furnace core of the present invention adopts a corrugated furnace core structure, which not only increases the radiation heat transfer area, but also meets the need for free expansion of the furnace core after being radiated at high temperature, and can eliminate stress concentration.

[0037] (4) The arrangement of the partition and the annular channel in the present invention is such that when water flows from bottom to top through the annular channel into the upper part of the partition, the water has a certain flow rate and can flush the bottom of the upper tube plate to prevent local overheating of the upper tube plate and cause overburning; at the same time, when water enters the upper part of the partition through the annular channel, it can flush away the bubbles and prevent gas accumulation on the upper tube plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The drawings in the specification, which constitute a part of the present application, are used to provide further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations on the present application.

[0039] Figure 1 It is a structural schematic diagram of a low-nitrogen high-efficiency condensing boiler of the present invention;

[0040] Figure 2 It is a schematic front view of the structure of the boiler body in the present invention;

[0041] Figure 3 yes Figure 2 A partial enlarged view of middle A;

[0042] Figure 4 It is a structural schematic diagram of the neutral smoke pipe of the present invention;

[0043] Figure 5 is a schematic structural stereogram of a spoiler in the present invention;

[0044] Figure 6 is a radial cross-sectional view of the spoiler of the present invention;

[0045] Figure 7 It is a schematic three-dimensional diagram of the structure of the frame in the present invention;

[0046] Figure 8 It is a schematic front view of the structure of the frame in the present invention;

[0047] Fig. 9 It is a structural schematic diagram of the first positioning column in the present invention;

[0048] Fig.10 It is a structural schematic diagram of the first column in the present invention;

[0049] Fig.11 It is a structural schematic diagram of the second column in the present invention;

[0050] Fig.12 It is a structural schematic diagram of the crossbeam in the present invention;

[0051] Fig.13 It is a structural schematic diagram of the top beam in the present invention;

[0052] Fig.14It is a schematic diagram of the cooperation between a side box panel and a frame in the present invention;

[0053] in,

[0054] 1-vertical cylinder, 101-upper end plate, 102-lower tube plate, 103-water inlet, 104-drainage outlet, 105-water outlet;

[0055] 2-furnace core, 201-main furnace core, 202-auxiliary furnace core;

[0056] 3- Upper tube plate;

[0057] 4-vertical smoke pipe, 401-spoiler, 402-helical surface;

[0058] 5-base, 501-smoke exhaust chamber, 502-smoke exhaust pipe, 503-condensation water outlet, 504-bottom plate;

[0059] 6- partition, 601- annular channel, 602- connection block;

[0060] 701- fan, 702- air pipe, 703- air filter, 704- gas pipe, 705- natural gas filter, 706- diaphragm pressure gauge;

[0061] 8-frame, 81-first positioning column, 82-first column, 821-connecting edge, 83-second positioning column, 84-second column, 841-through hole, 85-cross beam, 86-top beam, 87-square hole, 88-rib plate, 89-connecting hole;

[0062] 9-Box plate, 901-Screw, 902-Snap nut. DETAILED DESCRIPTION

[0063] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0064] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0065] Embodiment 1:

[0066] like Figure 1 As shown, a low-nitrogen high-efficiency condensing boiler comprises an outer shell and a boiler body located inside the outer shell;

[0067] The boiler body comprises a vertical cylinder 1, an upper end plate 101 with a middle opening is fixedly arranged at the top of the vertical cylinder 1, and a lower tube plate 102 is fixedly arranged at the bottom of the vertical cylinder 1;

[0068] A furnace 2 is arranged on the inner upper part of the vertical cylinder 1;

[0069] A full premixed combustion assembly is arranged on the top of the furnace 2, an upper tube plate 3 is fixedly arranged on the bottom of the furnace 2, and a plurality of vertical smoke pipes 4 connected to the inner cavity of the furnace 2 are fixedly arranged on the upper tube plate 3; the bottom of the vertical smoke pipe 4 is fixedly connected to the lower tube plate 102;

[0070] A base 5 is provided at the bottom of the boiler body, and a smoke exhaust cavity 501 connected to the vertical smoke pipe 4 is provided in the base 5. A smoke exhaust pipe 502 and a condensate outlet 503 are provided on one side of the smoke exhaust cavity 501, and the smoke exhaust pipe 502 is located above the condensate outlet 503;

[0071] A water inlet 103 and a sewage outlet 104 are arranged at the lower part of the side wall of the vertical cylinder 1 , and the sewage outlet 104 is located below the water inlet 103 ; a water outlet 105 is arranged at the upper part of the side wall of the vertical cylinder 1 .

[0072] The positions of the water inlet 103 and the water outlet 105 in the boiler of the present application are set so that the water flows from bottom to top; and the setting of the full premixed combustion assembly, the furnace 2, and the vertical smoke pipe 4 makes the flue gas flow from top to bottom; so that the water and the flue gas present a countercurrent heat exchange effect, wherein the high-temperature flue gas exchanges heat with the high-temperature water moving to the upper part of the vertical cylinder 1, and the low-temperature flue gas exchanges heat with the low-temperature water at the lower part of the vertical cylinder 1, so as to achieve a completely countercurrent heat exchange effect; without adding a condenser, the boiler of the present application instantly reduces the flue gas from more than 1000 degrees Celsius to below the dew point temperature in a small space, thereby absorbing the latent heat of vaporization of water in the flue gas and causing the flue gas to condense. It is a full-operating condensing boiler, thereby achieving sufficient and efficient heat exchange between the flue gas and water. At the same time, the vertical design and countercurrent heat exchange design of the boiler of the present application reduce the volume of the boiler on the basis of meeting the heat exchange requirements. Under the same heat exchange requirements, the volume of the boiler of the present application is half that of the traditional boiler.

[0073] Preferably, a forklift opening is provided on one side of the base 5 to facilitate transportation and loading and unloading by forklift.

[0074] Preferably, the bottom plate 504 of the smoke exhaust chamber 501 is in an inclined state, and the smoke exhaust pipe 502 and the condensation water outlet 503 are arranged at the inclined lower end of the bottom plate 504 to facilitate the discharge of condensation water.

[0075] Embodiment 2:

[0076] On the basis of Example 1, Figure 4-5 As shown, the vertical smoke pipe 4 is provided with a spoiler 401 inside to promote smoke to flow in a spiral direction, and the spoiler 401 extends from the inner upper part of the vertical smoke pipe 4 to the bottom;

[0077] The two side surfaces of the spoiler 401 are two parallel spiral surfaces 402 ; two spiral smoke flow channels are formed between the two spiral surfaces 402 of the spoiler 401 and the inner wall of the vertical smoke pipe 4 .

[0078] Specifically, Figure 6 As shown, the radial cross section of the spoiler 401 is a rectangular structure.

[0079] Specifically, the spoiler 401 is made of 316L stainless steel.

[0080] The spoiler 401 in the present application is easy to install. During installation, the formed spoiler 401 can be directly inserted into the vertical smoke pipe 4 so that the edge side wall of the spoiler 401 is close to the inner wall of the vertical smoke pipe 4, thereby achieving the clamping of the spoiler 401.

[0081] The vertical smoke pipe 4 of the boiler of the present application is provided with a spoiler 401, so that the smoke in the vertical smoke pipe 4 circulates along two spiral smoke flow channels, which not only increases the flow distance of the smoke, but also disturbs the smoke, strengthens the heat transfer effect of the smoke, and significantly increases the heat exchange efficiency, which can reach 2 to 3 times the heat exchange efficiency of the light tube under the same conditions. Due to the enhanced heat exchange efficiency, the heat exchange area of ​​the boiler can be appropriately reduced, and the steel consumption in the boiler manufacturing process is reduced. At the same time, the exhaust temperature of the boiler is greatly reduced, which can be 50 to 60°C lower than that of ordinary boilers, which greatly reduces the energy consumption of the boiler and improves the thermal efficiency of the boiler.

[0082] Embodiment 3:

[0083] On the basis of Example 1 or Example 2, Figure 2 As shown, the furnace 2 comprises a main furnace 201, and an auxiliary furnace 202 is coaxially arranged on the upper part of the main furnace 201;

[0084] The diameter of the auxiliary furnace 202 is smaller than the diameter of the main furnace 201;

[0085] The top of the auxiliary furnace 202 is fixedly connected to the side wall of the middle opening of the upper end plate 101 of the vertical cylinder 1.

[0086] In the prior art, the furnace core is designed with the same thickness at the top and the bottom, and the top of the furnace core is fixedly connected to the bottom of the upper end plate of the vertical cylinder. Since the diameter of the middle opening of the upper end plate of the vertical cylinder is smaller than the diameter of the furnace core, a part of the upper end plate of the vertical cylinder is located inside the furnace core. When the boiler is running, the high temperature in the furnace core will cause the temperature of the upper end plate of the vertical cylinder to be too high and easy to be damaged. In order to solve this problem, refractory materials are usually arranged at the bottom of the upper end plate of the vertical cylinder located inside the furnace core to achieve heat insulation. However, after long-term operation, the refractory materials are prone to fall off and lose their heat insulation effect, and are also prone to clogging the smoke pipe.

[0087] The furnace 2 in the boiler of the present application does not adopt a design of the same thickness at the top and bottom, but the upper part of the furnace 2 is set as an auxiliary furnace 202 with a reduced diameter that matches the opening in the middle of the upper end plate 101 of the vertical cylinder 1; during the operation of the boiler, the space between the furnace 2 and the vertical cylinder 1 is filled with water, that is, the lower part of the upper end plate 101 of the vertical cylinder 1 is filled with water, thereby achieving a water cooling effect on the upper end plate of the vertical cylinder. Therefore, the overall design of the furnace 2 in the present application not only avoids the use of refractory materials, but also uses the water between the furnace 2 and the vertical cylinder 1 to achieve a water cooling effect on the upper end plate of the vertical cylinder 1, thereby avoiding damage caused by excessive temperature of the upper end plate of the vertical cylinder.

[0088] Preferably, the main furnace 201 is a corrugated furnace; the furnace 2 adopts a corrugated furnace structure, which not only increases the radiation heat transfer area, but also meets the need for the furnace 2 to expand freely after being radiated at high temperature, and can eliminate stress concentration.

[0089] During the operation of the boiler, the vertical cylinder 1, the upper tube plate 3, the vertical smoke pipe 4, the furnace 2, etc. will expand due to heat, thereby generating thermal stress at the corresponding connection points, especially at the weld between the vertical smoke pipe 4 and the upper tube plate 3; and in the present application, the furnace 2 adopts a corrugated furnace, and the axially retractable and deformable characteristics of the corrugated furnace are utilized, so that the corrugated bending part of the furnace 2 can absorb the axial expansion and deformation of the vertical smoke pipe 4 after heating, and prevent the cracking of the weld between the vertical smoke pipe 4 and the upper tube plate 3, thereby eliminating the stress concentration at the corresponding connection.

[0090] Embodiment 4:

[0091] On the basis of Example 1 or Example 2 or Example 3, Figure 2-3 As shown, a partition 6 is provided at the lower part of the upper tube sheet 3, the side wall of the partition 6 is fixedly connected to the inner wall of the vertical cylinder 1, and the partition 6 is connected to the bottom of the upper tube sheet 3 through three connection blocks 602 evenly distributed along the circumferential direction;

[0092] The partition plate 6 is provided with through holes corresponding to each vertical smoke pipe 4 and for the corresponding vertical smoke pipe 4 to pass through, and an annular channel 601 is formed between the side wall of the through hole and the outer side wall of the corresponding vertical smoke pipe 4 .

[0093] Water flows from bottom to top through the annular channel 601 into the upper part of the partition 6. At this time, the water has a certain flow rate, which can flush the bottom of the upper tube plate 3 to prevent local overheating of the upper tube plate 3 and cause overburning. At the same time, when water enters the upper part of the partition 6 through the annular channel 601, it can flush away the bubbles and prevent gas accumulation in the upper tube plate 3.

[0094] Embodiment 5:

[0095] On the basis of Example 1 or Example 2 or Example 3 or Example 4, Figure 1As shown, the full premixed combustion assembly includes a fan 701, the inlet of the fan 701 is connected to one end of the venturi tube, the other end of the venturi tube is connected to the air duct 702, and the air filter 703 is arranged on the air duct 702; the venturi tube is also connected to the gas pipeline 704, and the gas pipeline 704 is provided with a natural gas filter 705, a gas valve, and a diaphragm box pressure gauge 706; the outlet of the fan 701 is connected to the burner, and the combustion head of the burner is located in the furnace 2.

[0096] The fan 701 is fixedly arranged on the upper part of the vertical cylinder 1 .

[0097] During operation, air enters the Venturi tube from the surrounding environment through the air pipe 702 by relying on the suction force generated by the fan 701. The air passing through the Venturi tube at high speed will form a negative pressure in the Venturi tube. The gas enters the gas valve from the gas pipeline 704. The gas valve outlet is connected to the Venturi tube. The gas is ejected by the negative pressure air. The ratio of the two is constant, thereby maintaining the ideal air-fuel ratio required for complete combustion. The mixed gas of gas and air enters the fan 701 and is fully mixed under the stirring of the fan blades. The gas fully mixed in the ideal ratio enters the burner and is fully burned, releasing heat.

[0098] The full premixed combustion assembly of the present application is set up, and the mixed gas with a certain air-fuel ratio is burned on the surface of the combustion head. The combustion temperature does not reach the temperature required to produce nitrogen oxides, so that the nitrogen oxide emission of the boiler of the present application is less than 30mg / m 3 , meeting environmental protection requirements.

[0099] Embodiment 6:

[0100] On the basis of Example 1 or Example 2 or Example 3 or Example 4 or Example 5, the outer shell includes a frame 8 in a rectangular parallelepiped structure and a box plate 9 located outside the frame 8;

[0101] like Figure 7-8 As shown, the frame 8 includes a first positioning column 81, a first column 82, a second positioning column 83, and a second column 84; the height of the first column 82 is greater than the first positioning column 81, and the height of the second column 84 is greater than the second positioning column 83;

[0102] There are four first positioning columns 81, which are respectively arranged at the four corners of the top surface of the base 5. The bottom ends of the first positioning columns 81 are fixedly connected to the top surface of the base 5. Specifically, the first positioning columns 81 are welded to the base 5. Each first positioning column 81 is connected to the lower end of the corresponding first column 82 by a self-tapping screw.

[0103] Second positioning columns 83 are arranged between the first positioning columns 81 distributed along the length direction of the base 5, and the bottom ends of the second positioning columns 83 are fixedly connected to the top surface of the base 5. Specifically, the second positioning columns 83 are connected to the base 5 by welding; each second positioning column 83 is connected to the lower end of the corresponding second column 84 by a self-tapping screw;

[0104] A plurality of beams 85 are arranged between adjacent first columns 82 along the height direction, and a through hole 841 for the corresponding beams 85 to pass through is arranged on the second column 84; the highest beam 85 is located at the top of the first column 82; the beam 85 is connected to the first column 82 by self-tapping screws;

[0105] A top beam 86 is provided on the top of the two second columns 84; both ends of the top beam 86 are connected to the corresponding cross beam 85 by self-tapping screws;

[0106] A plurality of square holes 87 are provided on the end surfaces facing outwards of the first column 82, the second column 84, the cross beam 85, and the top beam 86;

[0107] like Fig.14 As shown, the box plates 9 located on the side and top surfaces of the frame 8 are connected to the corresponding parts of the frame 8 by a plurality of screws 901; wherein, only the box plates 9 on one side surface of the frame 8 are drawn in the figure, and the box plates 9 on the other side surfaces and top surface are not drawn;

[0108] A snap nut 902 is disposed in the square hole 87 corresponding to the corresponding screw 901 .

[0109] In the present application, the first column 82 and the first positioning column 81, the second column 84 and the second positioning column 83, the cross beam 85 and the first column 82, and the top beam 86 and the cross beam 85 are all detachably connected by self-tapping screws; each box plate 9 and the frame 8 are also detachably connected by screws 901 and snap nuts 902; therefore, during the transportation and handling of the boiler of the present application, the boiler body, each part of the frame 8, and each box plate 9 can be disassembled, thereby realizing sub-packaging and transportation, avoiding the problems of large overall handling weight and large space required for transportation. After the handling or transportation is completed, the frame 8, box plate 9 and the boiler body are assembled.

[0110] In the present application, the arrangement of the upper profile holes 87 on the first column 82, the second column 84, the cross beam 85, and the top beam 86 is used, on the one hand, to install the snap nuts 902, and on the other hand, to reduce the weight of each component.

[0111] Preferably, ribs 88 are provided between the two ends of the crossbeam 85 passing through the through holes 841 on the second columns 84 and the corresponding first columns 82 to strengthen the overall strength of the frame 8 .

[0112] Preferably, Fig. 9 As shown, the first positioning column 81 is a C-shaped steel plate;

[0113] A plurality of square holes 87 and a plurality of connecting holes 89 are provided on the bottom side and the middle legs on both sides along the height direction of the first positioning column 81;

[0114] The second positioning column 83 has the same structure as the first positioning column 81 .

[0115] Preferably, Fig.10 As shown, the first column 82 comprises a channel steel plate, and a connecting edge 821 for connecting with the end of the corresponding crossbeam 85 is vertically arranged at one side end of the channel steel plate in the first column 82;

[0116] A plurality of square holes 87 and a plurality of connecting holes 89 are provided on the three end surfaces of the channel steel plate in the height direction of the first column 82;

[0117] A plurality of connection holes 89 are provided on the connection edge 821 along the height direction.

[0118] Preferably, Fig.11 As shown, the second column 84 includes a channel steel plate, and a plurality of square holes 87 are arranged on the bottom end surface of the channel steel plate in the second column 84 along the height direction.

[0119] Preferably, Fig.12 As shown, the crossbeam 85 is a C-shaped steel plate;

[0120] A plurality of square holes 87 and a plurality of connecting holes 89 are provided on the bottom side and the middle leg sides on both sides along the height direction of the cross beam 85 .

[0121] Preferably, Fig.13 As shown, the top beam 86 is a C-shaped steel plate;

[0122] A plurality of square holes 87 and a plurality of connecting holes 89 are provided on the bottom side and the middle leg sides on both sides along the height direction of the top beam 86 .

[0123] In the present application, the first column 82 and the first positioning column 81, the second column 84 and the second positioning column 83, the cross beam 85 and the first column 82, and the top beam 86 and the cross beam 85 are all detachably connected by self-tapping screws, wherein the self-tapping screws are installed through the corresponding connecting holes 89 on the corresponding parts.

[0124] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not a limitation of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the protection scope of the present invention.

Claims

1. A low-nitrogen high-efficiency condensing boiler, characterized in that: It includes an outer shell and a boiler body located inside the outer shell; The boiler body comprises a vertical cylinder, an upper end plate with a middle opening is fixedly arranged on the top of the vertical cylinder, and a lower tube plate is fixedly arranged on the bottom of the vertical cylinder; A furnace is arranged on the inner upper part of the vertical cylinder; A full premixed combustion assembly is arranged on the top of the furnace, an upper tube plate is fixedly arranged on the bottom of the furnace, and a plurality of vertical smoke pipes connected to the inner cavity of the furnace are fixedly arranged on the upper tube plate; the bottom of the vertical smoke pipe is fixedly connected to the lower tube plate; A base is provided at the bottom of the boiler body, a smoke exhaust cavity connected to the vertical smoke pipe is provided in the base, a smoke exhaust pipe and a condensate outlet are provided on one side of the smoke exhaust cavity, and the smoke exhaust pipe is located above the condensate outlet; A water inlet and a sewage outlet are arranged at the lower part of the side wall of the vertical cylinder, and the sewage outlet is located below the water inlet; a water outlet is arranged at the upper part of the side wall of the vertical cylinder; The vertical smoke pipe is provided with a spoiler to promote smoke to flow in a spiral direction, and the spoiler extends from the upper inner part of the vertical smoke pipe to the bottom; The two side surfaces of the spoiler are two parallel spiral surfaces; two spiral smoke flow channels are formed between the two spiral surfaces of the spoiler and the inner wall of the vertical smoke pipe; A partition is provided at the lower part of the upper tube plate, the side wall of the partition is fixedly connected to the inner wall of the vertical cylinder, and the partition is connected to the bottom of the upper tube plate through three connecting blocks evenly distributed along the circumferential direction; The partition is provided with through holes corresponding to each vertical smoke pipe one by one and for the corresponding vertical smoke pipe to pass through, and an annular channel is formed between the side wall of the through hole and the outer side wall of the corresponding vertical smoke pipe.

2. The low-nitrogen high-efficiency condensing boiler according to claim 1 is characterized in that: A forklift opening is arranged on one side of the base.

3. The low-nitrogen high-efficiency condensing boiler according to claim 1 is characterized in that: The bottom plate of the smoke exhaust cavity is in an inclined state, and the smoke exhaust pipe and the condensation water outlet are arranged at the inclined lower end of the bottom plate.

4. The low-nitrogen high-efficiency condensing boiler according to claim 1 is characterized in that: The radial cross section of the spoiler is a rectangular structure.

5. The low-nitrogen high-efficiency condensing boiler according to claim 1 is characterized in that: The furnace core comprises a main furnace core, and an auxiliary furnace core is coaxially arranged on the upper part of the main furnace core; The diameter of the auxiliary furnace is smaller than the diameter of the main furnace; The top of the auxiliary furnace is fixedly connected to the side wall of the middle opening of the upper end plate of the vertical cylinder.

6. The low-nitrogen high-efficiency condensing boiler according to claim 5, characterized in that: The main furnace core is a corrugated furnace core.

7. The low-nitrogen high-efficiency condensing boiler according to claim 1 is characterized in that: The full premixed combustion assembly includes a fan, the inlet of the fan is connected to one end of a venturi tube, the other end of the venturi tube is connected to an air duct, and an air filter is arranged on the air duct; the venturi tube is also connected to a gas pipeline, and a natural gas filter, a gas valve, and a diaphragm pressure gauge are arranged on the gas pipeline; the outlet of the fan is connected to a burner, and the combustion head of the burner is located in the furnace.

8. The low-nitrogen high-efficiency condensing boiler according to claim 1, characterized in that: The outer shell comprises a frame in a rectangular parallelepiped structure and a box plate located outside the frame; The frame includes a first positioning column, a first column, a second positioning column, and a second column; the height of the first column is greater than that of the first positioning column, and the height of the second column is greater than that of the second positioning column; There are four first positioning columns, which are respectively arranged at the four corners of the top surface of the base. The bottom ends of the first positioning columns are fixedly connected to the top surface of the base. Each first positioning column is connected to the lower end of the corresponding first column by a self-tapping screw. Second positioning columns are arranged between the first positioning columns distributed along the length direction of the base, and the bottom ends of the second positioning columns are fixedly connected to the top surface of the base; each second positioning column is connected to the lower end of the corresponding second column by a self-tapping screw; A plurality of beams are arranged between adjacent first columns along the height direction, and through holes for corresponding beams to pass through are arranged on the second columns; the highest beam is located on the top of the first column; the beam is connected to the first column by self-tapping screws; A top beam is arranged on the top of the two second columns; both ends of the top beam are connected to the corresponding cross beams by self-tapping screws; A plurality of square holes are arranged on the end surfaces facing outwards of the first column, the second column, the cross beam and the top beam; The box panels located on the side and top of the frame are connected to the corresponding parts of the frame by a number of screws; A snap nut is arranged in the square hole corresponding to the corresponding screw.

Images