Boiler

Abstract

The utility model discloses a boiler which comprises an evaporator module, the evaporator module comprises a heated tube bundle group and a hearth, and the upper end and the lower end of the heated tube bundle group are fixedly connected with an upper rectangular barrel and a lower rectangular barrel which are matched with the heated tube bundle group respectively. The cross section, close to the heated tube bundle group, of the upper rectangular barrel and the cross section, close to the heated tube bundle group, of the lower rectangular barrel are both rectangular, and the path of high-temperature smoke generated by a hearth is matched with the heated tube bundle group. The length of the heated tube bundle group is equal to that of the combustion surface in the hearth, so that no smoke dead angle exists when the heated tube bundle group is heated by high-temperature smoke generated by the combustion surface, and the utilization rate of the heated surface tube bundles is improved; meanwhile, the outer end faces of the upper and lower barrels are designed into rectangular sections, the overall structure is compact, stacking and transportation are convenient, the occupied area is small, and the space utilization rate is improved to the maximum extent.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of boiler, specifically relates to a boiler. BACKGROUND

[0002] The traditional boiler is heated, and the high-temperature flue gas in the furnace of the evaporator module heats the heated tube bundle group, as shown in the figure, when the high-temperature flue gas moves and heats the heated tube bundle group, there is still a large amount of flue gas dead zone (as shown in A), which leads to low utilization rate of the heated tube bundle group, thereby affecting the efficiency of heating water in the boiler. Figure 4

[0003] The outer end face of the upper and lower cylinder of the traditional boiler is usually in a circular structure, and can also refer to the figure, this design often needs to be placed and fixed separately during transportation, cannot be stacked and placed, occupies a large space, and can have the problems of inconvenient installation and poor space utilization. Figure 4

[0004] Therefore, in view of the above technical problems, it is necessary to provide a boiler.

[0005] The information disclosed in the background section of this document is only intended to increase the understanding of the overall background of the present utility model, and should not be regarded as acknowledging or implying in any form that the information constitutes prior art known to those skilled in the art. CONTENT OF THE UTILITY MODEL

[0006] The utility model aims at providing a boiler, which can solve the problems in the background.

[0007] In order to achieve the above-mentioned purpose, the technical scheme provided by the utility model in one embodiment is as follows: a boiler, comprising an evaporator module, the evaporator module comprising a heated tube bundle group and a furnace, the upper and lower ends of the heated tube bundle group are fixedly connected with an upper rectangular cylinder and a lower rectangular cylinder respectively, the shape of the cross section of the upper rectangular cylinder and the lower rectangular cylinder near the heated tube bundle group is rectangular, and the high-temperature flue gas path generated by the furnace matches the heated tube bundle group.

[0008] In one or more embodiments of the utility model, the heated tube bundle group comprises a straight water pipe group, the top end of the straight water pipe group is welded on the bottom end face of the upper rectangular cylinder, and the bottom end is welded on the top end face of the lower rectangular cylinder.

[0009] In one or more embodiments of the utility model, the upper rectangular cylinder and the lower rectangular cylinder are connected through the straight water pipe group.

[0010] In one or more embodiments of the utility model, the side end face of the furnace near the heated tube bundle group is provided with a combustion surface. ​​

[0011] In one or more embodiments of the present application, the straight water pipe group is provided with a group of drop pipes at both ends, and the drop pipes are located at both sides of the heated tube bundle group.

[0012] In one or more embodiments of the present application, one side of the two groups of drop pipes is provided with a group of membrane walls, one end of the two groups of membrane walls is connected with the combustion surface, and the distance between the two groups of membrane walls is equal to the length of the combustion surface.

[0013] In one or more embodiments of the present application, a plurality of groups of spiral finned tubes are arranged in the middle of the two groups of membrane walls, and one side of the spiral finned tubes is away from the combustion surface.

[0014] In one or more embodiments of the present application, a plurality of groups of light beam convection tube bundles are arranged on one side of the spiral finned tubes close to the combustion surface.

[0015] In one or more embodiments of the present application, a spacing is arranged between the light beam convection tube bundle and the combustion surface.

[0016] In one or more embodiments of the present application, the drop pipes, membrane walls, spiral finned tubes and light beam convection tube bundles are arranged in parallel.

[0017] Compared with the prior art, in the boiler evaporator module of the present application, the upper and lower cylinders are designed in a rectangular cross section, the length of the heated tube bundle group is equal to the length of the combustion surface in the furnace, therefore, there is no dead angle of flue gas when the high-temperature flue gas generated by the combustion surface heats the heated tube bundle group, thereby improving the utilization rate of the heating surface tube bundle; meanwhile, the outer end face of the upper and lower cylinders is designed in a rectangular cross section, the overall structure is compact, convenient for stacking and transportation, occupies small area, and maximizes the utilization rate of space. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0019] Figure 1 It is a front view of the evaporator module in an embodiment of the present application.

[0020] Figure 2 It is a top view of the evaporator module in an embodiment of the present application.

[0021] Figure 3 It is a partial structure schematic view in an embodiment of the present application.

[0022] Figure 4 Figure 1 is a top view of the evaporator module in the prior art.

[0023] Explanation of main reference signs:

[0024] 1-evaporator module, 101-upper rectangular cylinder, 102-lower rectangular cylinder, 103-heated tube bundle group, 104-furnace, 105-downcomer, 106-membrane wall, 107-spiral finned tube, 108-beam convection tube bundle, 109-burning surface. DETAILED DESCRIPTION

[0025] In order to make the person skilled in the art better understand the technical scheme in the utility model, the technical scheme in the utility model embodiment will be clearly and completely described below in combination with the drawings in the utility model embodiment. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor should belong to the protection scope of the utility model.

[0026] As shown in Figure 1 An embodiment of the utility model, a boiler, comprising an evaporator module 1, a superheater economizer module (not shown in the figure) and a separation bubble (not shown in the figure), the evaporator module 1, the superheater economizer module and the separation bubble are all provided with a butt joint interface, each module is standardized manufacturing, convenient to manufacture, the number of modules can be increased or decreased according to the evaporation capacity, the interface is reserved on site, the butt joint interface is directly connected during installation, so that the installation is convenient and fast, thereby a large amount of manpower is reduced.

[0027] Preferably, the external separation steam drum, the steam drum volume is customized according to tonnage, modular assembly delivery. The evaporator module, the superheater module and the economizer module are connected on site, the external separation mechanism is adopted, compared with the prior art, the steam-water separation space is large, and the steam-water separation effect is good.

[0028] As shown in Figure 2 The evaporator module 1 comprises an upper rectangular cylinder 101, a lower rectangular cylinder 102 and a heated tube bundle group 103, the heated tube bundle group 103 is located in the middle of the upper rectangular cylinder 101 and the lower rectangular cylinder 102, the shape of the cross section of the upper rectangular cylinder 101 and the lower rectangular cylinder 102 close to the heated tube bundle group 103 is rectangular, and the range of the flue gas generation area of the furnace 104 matches the length of the heated tube bundle group 103. The upper and lower water chambers adopt rectangular cross sections, which facilitates the arrangement of the heating surface tubes, prevents the dead angle of flue gas generated by the tube bundle arrangement, and improves the compactness of the heating surface arrangement.

[0029] Further, the upper and lower cavities of the evaporator module are composed of a semicircular cylinder, a special-shaped head and a rectangular tube plate by welding, all connections adopt butt welding type, and the "T type" joint welding type is not adopted, which breaks the limitation that the "T type" joint can only be used for the rated pressure of not more than 2.5 MPa. The rated pressure of this type of boiler can be made to high pressure level 9.8 MPa;

[0030] The semicircular cylinder, the special-shaped head and the rectangular tube plate do not belong to the common module type, and the strength of the whole upper and lower cavities is checked by the finite element analysis method to ensure the safety of the boiler.

[0031] Preferably, two groups of furnaces 104 with the same height are installed on one side wall of the heated tube bundle group 103, and a combustion surface 109 is arranged on one side end face of the furnace 104 close to the heated tube bundle group 103.

[0032] For the boiler with high superheated steam temperature, the furnace 104 area is designed as a furnace module, and the high-temperature superheater is arranged in the furnace 104. Because the independent furnace module is arranged, the combustion space does not need to be reserved in the evaporator module, so that the tube bundles arranged on the rectangular tube plate are uniform, and the stress condition is improved.

[0033] For the boiler with low superheated steam temperature, an overheat economizer module is additionally arranged at the rear of the evaporator module 1 to realize the combination of the saturated steam and superheated steam boiler by using the standard module and flexible configuration.

[0034] Further, the combustion surface 109 is used as a device for distributing and burning fuel, which is mainly composed of a gas chamber, a uniform gas hole plate, a combustion surface tube group and a flame arrester. The gas chamber is welded by steel plates to form a cavity with both ends open and four sides closed. One side is connected with a mixer, and the other side is connected with a water-cooled tube group. The uniform gas hole plate is arranged inside the gas chamber close to the water-cooled tube group, which is made of steel sheet and has multiple small holes for uniform air distribution. The water-cooled tube group is composed of multiple outer square and inner circular straight tubes arranged in a straight line, and a certain gap is left between two adjacent tubes as a pre-mixed gas flow and combustion channel. The outer square and inner circular tubes are circular at both ends. The flame arrester is arranged in the gap of the water-cooled tube group as a pre-mixed gas injection and anti-backfire device, which is composed of multiple corrugated steel sheets.

[0035] As Figure 3As shown, the heated tube bundle group 103 includes a straight water tube group, the top end of which is welded to the bottom end face of the upper rectangular cylinder 101, and the bottom end is welded to the top end face of the lower rectangular cylinder 102. The upper rectangular cylinder 101 and the lower rectangular cylinder 102 are connected through the straight water tube group, and one group of downcomers 105 is arranged at both ends of the straight water tube group. The downcomers 105 are located on both sides of the heated tube bundle group 103. One group of membrane walls 106 is arranged on one side of each of the two groups of downcomers 105. One end of each of the two groups of membrane walls 106 is connected with the combustion surface 109. The distance between the two groups of membrane walls 106 is equal to the length of the combustion surface 109. A plurality of groups of spiral finned tube 107 are arranged in the middle of the two groups of membrane walls 106. A plurality of groups of light beam convection tube bundles 108 are arranged on the side of the spiral finned tube 107 away from the combustion surface 109 and on the side of the spiral finned tube 107 close to the combustion surface 109.

[0036] Further, a spacing is arranged between the light beam convection tube bundle 108 and the combustion surface 109 to avoid direct contact between the combustion surface and the light beam convection tube bundle 108, thereby preventing damage to the straight water tube group.

[0037] Further, the straight water tube group connects the upper cavity and the lower cavity. The straight water tube group includes membrane wall tubes, small-diameter light tubes, spiral finned tubes 107, and large-diameter light tubes, and is arranged as follows:

[0038] 1. The membrane wall tube is composed of a tube and a steel plate. The steel plate is located between two adjacent straight circular tubes and connects the two tubes adjacent to each other by welding to form a closed wall. The membrane wall tube is arranged in the outermost circle of the boiler body to isolate the flame and high-temperature flue gas in the boiler body.

[0039] 2. One side of the membrane wall tube is connected with the combustion surface tube group as the inlet of the premixed gas and the combustion area, and the other side is the flue gas outlet.

[0040] 3. The small-diameter light tube group and the spiral finned tube group are arranged in sequence along the flue gas flow direction.

[0041] 4. The membrane wall outside is provided with non-heated large-aperture downcomers to ensure the stability of water circulation.

[0042] In use, for example, Figure 2The high-temperature flue gas produced by the combustion in the shown furnace 104 is transferred to the heated tube bundle group 103 by the path of the dotted line in the figure, and the water in the inside of the heated tube bundle group 103 is communicated with the upper rectangular cylinder 101 and the lower rectangular cylinder 102, so as to transfer the heat to the water in the upper rectangular cylinder 101 and the lower rectangular cylinder 102, and since the upper rectangular cylinder 101 and the lower rectangular cylinder 102 adopt the rectangular cross-section design, the utilization rate of the heat receiving surface tube bundle is high.

[0043] It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the involved claims.

[0044] In addition, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description manner of the specification is only for the sake of clarity, and those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be properly combined to form other embodiments which can be understood by those skilled in the art.

Claims

1. A boiler comprising an evaporator module, the evaporator module comprising a group of heated tube banks and a furnace, characterized in that, The upper and lower ends of the heated tube bundle group are respectively fixedly connected with upper and lower rectangular cylinder bodies matched with the heated tube bundle group, the upper and lower rectangular cylinder bodies are rectangular in cross section near the heated tube bundle group, and the high-temperature flue gas path generated by the hearth is matched with the heated tube bundle group.

2. A boiler according to claim 1, characterised in that The heated tube bundle group comprises a straight water pipe group, the top end of the straight water pipe group is welded to the bottom end face of the upper rectangular cylinder body, and the bottom end is welded to the top end face of the lower rectangular cylinder body.

3. A boiler according to claim 2, characterised in that The upper and lower rectangular cylinder bodies are communicated through the straight water pipe group.

4. A boiler according to claim 3, characterised in that One side end face of the hearth near the heated tube bundle group is provided with a combustion surface.

5. A boiler according to claim 4, characterised in that Both ends of the straight water pipe group are provided with a group of downcomers, and the downcomers are located on both sides of the heated tube bundle group.

6. A boiler according to claim 5, characterised in that One side of each of the two groups of downcomers is provided with a group of membrane walls, one end of each of the two groups of membrane walls is connected with the combustion surface, and the distance between the two groups of membrane walls is equal to the length of the combustion surface.

7. A boiler according to claim 6, characterised in that A plurality of groups of spiral finned tubes are arranged in the middle of the two groups of membrane walls, and one side of the spiral finned tubes away from the combustion surface.

8. A boiler according to claim 7, characterised in that A plurality of groups of light beam convection tube bundles are arranged on one side of the spiral finned tubes close to the combustion surface.

9. A boiler according to claim 8, characterised in that A spacing is arranged between the light beam convection tube bundles and the combustion surface.

10. A boiler according to claim 9, characterised in that The downcomers, membrane walls, spiral finned tubes and light beam convection tube bundles are arranged in parallel.

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