Double-drum waste heat boiler

Abstract

The utility model relates to the technical field of boilers, in particular to a double-boiler-barrel waste heat boiler which comprises a shell, an upper boiler barrel is installed on the upper portion in the shell, a lower boiler barrel is installed on the lower portion in the shell, a hearth is arranged in the shell, a convection bank is vertically installed in the middle of the hearth, and an evaporation heating surface flue is arranged between the upper boiler barrel and the lower boiler barrel. The convection bank is arranged on the inner side of the evaporation heating surface flue, the top end of the convection bank is connected with the upper boiler barrel, the bottom end of the convection bank is connected with the lower boiler barrel, and hearth flues are arranged outside the two sides of the evaporation heating surface flue. According to the double-drum waste heat boiler, an upper-lower double-drum structure is adopted, and the upper drum and the lower drum are communicated through the convection bank. By means of the structure, the heating area is increased, the smoke flow speed is increased, and therefore the heat transfer efficiency is effectively improved. Compared with a traditional single-boiler-barrel structure, the double-boiler-barrel structure can recycle waste heat resources more sufficiently, and energy waste is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of boilers, in particular to a double-drum waste heat boiler. Background Art

[0002] In the process of industrial production, a large amount of heat energy is often released and not effectively utilized. This part of energy is called waste heat. Waste heat is an important secondary energy source. Its recycling is of great significance for improving energy efficiency, reducing energy consumption and reducing environmental pollution. Waste heat boilers, as a device that can effectively recycle this part of waste heat, are widely used in various industrial production environments.

[0003] However, traditional waste heat boilers have certain limitations in design and operation. On the one hand, traditional waste heat boilers often have low heat transfer efficiency and cannot fully recycle waste heat resources, resulting in energy waste. On the other hand, traditional boilers also have serious smoke and dust emission problems, which not only pollute the environment, but also increase the environmental protection pressure of enterprises. Utility Model Content

[0004] The utility model aims to provide a double-drum waste heat boiler to solve the problem that the traditional waste heat boiler mentioned in the above background technology has certain limitations in design and operation.

[0005] To achieve the above-mentioned purpose, the utility model provides a double-drum waste heat boiler, including an outer shell, an upper drum is installed on the upper part of the inner part of the outer shell, a lower drum is installed on the lower part of the inner part of the outer shell, a furnace is arranged inside the outer shell, a convection tube bundle is vertically installed in the middle of the furnace, an evaporation heating surface flue is arranged between the upper drum and the lower drum, the convection tube bundle is arranged on the inner side of the evaporation heating surface flue, the top end of the convection tube bundle is connected to the upper drum, and the bottom end of the convection tube bundle is connected to the lower drum, furnace flues are arranged on the outside of both sides of the evaporation heating surface flue, the furnace flue includes left and right flues, a superheater and a primary smoke separation device are arranged inside the flue on one side, and a secondary smoke separation device and an economizer are arranged inside the flue on the other side.

[0006] Preferably, a base is installed at the bottom of the shell, a steel frame is installed on the base at the outer side of the shell, and a sewage pipe is installed on one side of the base.

[0007] Preferably, a water spray desuperheater is installed on the top of the steel frame.

[0008] Preferably, platform ladders are installed on the outside of both sides of the shell, and the middle part of the platform ladder is fixed on the steel frame.

[0009] Preferably, a flue gas inlet is provided near the superheater at one end of the outer shell, and a flue gas outlet is provided near the lower drum at the other end of the outer shell. One end of the flue gas inlet is connected to one end of a primary dust separation device, the other end of the primary dust separation device is connected to one end of a secondary dust separation device, the other end of the secondary dust separation device is connected to a economizer, and the output end of the economizer is connected to the flue gas outlet.

[0010] Preferably, the top of the superheater is connected to the upper drum and the superheater header through two superheater connecting pipes respectively.

[0011] Preferably, a heat insulation layer is provided on the outer wall of the furnace, and an ash cleaning port is provided at the bottom of the furnace.

[0012] Preferably, the evaporative heating surface flue is composed of furnace membrane wall tubes; the furnace flue is composed of furnace membrane wall tubes and evaporative heating surface membrane walls.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0014] In this double-drum waste heat boiler, the present utility model adopts an upper and lower double-drum structure, and connects the upper drum and the lower drum through convection tube bundles. This structure not only increases the heating area, but also improves the flue gas flow velocity, thus effectively improving the heat transfer efficiency. Compared with the traditional single-drum structure, the double-drum structure can recover and utilize waste heat resources more fully and reduce energy waste. The present utility model arranges a furnace flue on both outer sides of the evaporative heating surface flue, and arranges a superheater, a primary dust separation device, a secondary dust separation device and an economizer therein. This layout enables the dust to be separated in multiple stages in the furnace, effectively reducing the dust emission concentration and reducing environmental pollution. At the same time, the setting of the economizer also further improves the recovery and utilization efficiency of thermal energy. The present utility model also adopts advanced technologies such as membrane water walls and convection tube bundle membrane walls, enhancing the sealing performance and heat transfer performance of the boiler. The setting of the heat insulation layer also effectively reduces the loss of thermal energy and improves the overall thermal efficiency of the boiler. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0016] Figure 2 is a schematic side view of the present utility model;

[0017] Figure 3 is a schematic top view of the present utility model.

[0018] The meanings of each label in the figure are as follows:

[0019] 1. Upper drum; 2. Lower drum; 3. Shell; 31. Base; 32. Steel frame; 33. Drain pipe; 34. Platform escalator; 35. Flue gas inlet; 36. Flue gas outlet; 4. Convection tube bundle; 41. Evaporation heating surface membrane wall; 5. Superheater; 51. Superheater connecting pipe; 52. Superheater header; 6. Furnace; 61. Furnace membrane wall tube; 62. Insulation layer; 63. Soot cleaning port; 7. Economizer; 8. Primary smoke separation device; 9. Secondary smoke separation device; 10. Water spray desuperheater. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] The utility model provides a double-drum waste heat boiler, such as Figure 1-Figure 3 As shown, it includes an outer shell 3, an upper boiler drum 1 is installed on the upper part of the inner shell 3, a lower boiler drum 2 is installed on the lower part of the inner shell 3, a furnace 6 is arranged inside the outer shell 3, a convection tube bundle 4 is vertically installed in the middle of the furnace 6, an evaporation heating surface flue is arranged between the upper boiler drum 1 and the lower boiler drum 2, the convection tube bundle 4 is arranged on the inner side of the evaporation heating surface flue, the top end of the convection tube bundle 4 is connected to the upper boiler drum 1, and the bottom end of the convection tube bundle 4 is connected to the lower boiler drum 2, furnace flues are arranged on the outside of the evaporation heating surface flue on both sides of the evaporation heating surface flue, the furnace flue includes left and right flues, a superheater 5 and a primary smoke separation device 8 are arranged inside one flue, and a secondary smoke separation device 9 and an economizer 7 are arranged inside the other flue, by installing the upper boiler drum 1 on the upper part of the inner shell 3 and the lower boiler drum 2 on the lower part, a compact and efficient heat recovery system is constructed. This layout of the upper and lower drums is conducive to achieving natural circulation, so that the working medium forms a reliable circulation flow between the convection tube bundle 4, the upper drum 1 and the lower drum 2, thereby improving the heat recovery efficiency.

[0022] Secondly, the convection tube bundle 4 installed vertically in the middle of the furnace 6 not only increases the heat exchange area, but also effectively utilizes the heat in the furnace. The convection tube bundle 4 is arranged inside the flue of the evaporation heating surface and connected to the upper drum 1 and the lower drum 2. This design further strengthens the transfer and recovery of heat energy, making more effective use of waste heat.

[0023] Furthermore, the furnace flues arranged outside the evaporation heating surface flue on both sides realize effective treatment of smoke dust through the layout on the left and right sides. The superheater 5 and the primary smoke dust separation device 8 arranged inside the flue on one side can not only further heat the flue gas, but also preliminarily separate the smoke dust and reduce emission pollution. The secondary smoke dust separation device 9 and the economizer 7 inside the flue on the other side further improve the separation effect of the smoke dust, recover the waste heat in the smoke, and improve the energy utilization efficiency.

[0024] In this embodiment, a base 31 is installed at the bottom of the shell 3, a steel frame 32 is installed on the base 31 at the outside of the shell 3, and a sewage pipe 33 is installed on one side of the base 31 for sewage discharge.

[0025] Specifically, a water spray desuperheater 10 is installed on the top of the steel frame 32 for performing cooling operations.

[0026] Furthermore, platform ladders 34 are installed on the outside of both sides of the shell 3, and the middle part of the platform ladder 34 is fixed on the steel frame 32.

[0027] Furthermore, a flue gas inlet 35 is provided at one end of the outer shell 3 near the superheater 5, and a flue gas outlet 36 is provided at the other end of the outer shell 3 near the lower drum 2. The flue gas inlet 35 is connected to one end of a primary smoke separation device 8, the other end of the primary smoke separation device 8 is connected to one end of a secondary smoke separation device 9, the other end of the secondary smoke separation device 9 is connected to the economizer 7, and the output end of the economizer 7 is connected to the flue gas outlet 36.

[0028] Furthermore, the top of the superheater 5 is connected to the upper drum 1 and the superheater header 52 through two superheater connecting pipes 51 respectively.

[0029] Furthermore, the outer wall of the furnace 6 is provided with a heat-insulating layer 62, and the bottom of the furnace 6 is provided with a ash cleaning port 63 for performing ash cleaning operations.

[0030] Furthermore, the evaporation heating surface flue is composed of the furnace membrane wall tube 61; the furnace flue is composed of the furnace membrane wall tube 61 and the evaporation heating surface membrane wall 41.

[0031] When the double-drum waste heat boiler of the utility model is used, first, the convection tube bundle is connected between the upper drum 1 and the lower drum 2 by welding, and is arranged vertically in a row in the flue of the evaporation heating surface, and the flue gas four-fold baffle is used to increase the flue gas flow rate and form a horizontal flushing. Since the convection tube bundle adopts the flue gas four-fold baffle to increase the flue gas flow rate and form a horizontal flushing, the heat transfer capacity of the convection tube bundle is improved. At the same time, the furnace flue on both sides and the double drum arrangement are adopted, and the first-level smoke dust separation device 8 and the second-level smoke dust separation device 9 are formed in the furnace flue on both sides, and the heating surface has the multifunctionality of both heat transfer and smoke isolation. The economizer 7 in the furnace flue on both sides adopts a membrane structure, which increases the heat exchange area of ​​the economizer. Since the convection tube bundle connects the upper drum 1 and the lower drum 2 by welding, the working medium forms a reliable natural circulation between the convection tube bundle 4, the upper drum 1 and the lower drum 2 by the density difference, and there is no need to configure a downcomer and a steam guide pipe. In this way, the waste heat boiler can achieve the functions of efficient heat transfer and two-stage furnace smoke and dust separation, and has the advantages of compact structure, low cost, small footprint, high efficiency, environmental protection, and energy saving.

[0032] The double-drum high-efficiency waste heat boiler has a boiler body placed on a concrete foundation, and a flue gas inlet 35 is opened on the front furnace wall near the upper drum 1. The flue gas enters the boiler body from the flue gas inlet 35, flows through the water-cooled membrane wall and the left furnace flue wall flue of the convection tube bundle 4 membrane wall, and passes through the primary smoke dust separation device 7. The fly ash falls to the bottom of the primary smoke dust separation device due to inertia, and then is regularly cleaned out of the furnace; the flue gas enters the evaporation heating surface flue composed of the convection tube bundle membrane wall flue, and the flue gas is baffled in the middle by four flue gas baffles to increase the flue gas flow rate and form a horizontal flushing. The flue gas enters the right furnace flue wall flue composed of the water-cooled membrane wall and the convection tube bundle membrane wall at the upper horizontal outlet of the convection tube bundle. The flue gas passes through the secondary smoke dust separation device. The fly ash falls to the bottom of the separation device due to inertia, and then is regularly cleaned out of the furnace; the economizer 7 is arranged in the right furnace flue, and the flue gas is discharged out of the furnace through the flue gas outlet 36 after passing through the economizer 7.

[0033] The superheater is arranged in the flue of the left furnace. After passing through the superheater 5, the flue gas enters the primary smoke separation device, and then enters the evaporation heating surface flue, which is composed of a boiler tube bundle membrane wall flue. The superheater 5 serpentine tube is suspended in the flue of the left furnace 6. In order to improve the scouring of the flue gas on the economizer 7, the economizer 7 is made of a boiler fin tube bent into a serpentine structure and hung on a supporting steel frame, and is arranged in a staggered manner in the right furnace flue.

[0034] In order to make the outlet steam of superheater 5 reach the rated outlet parameters and to ensure the safe operation of waste heat, valves and instruments such as water inlet, water level, pressure, safety, and surface sewage discharge are designed on the upper drum 1; a sewage valve is designed on the lower drum 2; various safety accessories, measuring instruments and interlocking control devices are designed on the outlet header of superheater 5 to ensure reliable operation, so as to ensure the safe operation of the equipment.

[0035] Finally, it should be noted that the electronic components of the primary smoke separation device 8, the secondary smoke separation device 9, the economizer 7, the superheater 5, etc. in this embodiment are all universal standard parts or parts known to those skilled in the art, and their structures and principles can be known to those skilled in the art through technical manuals or through conventional experimental methods. In the idle part of this device, all the above-mentioned electrical components are connected by wires respectively, and the specific connection means should refer to the working sequence between the electrical components in the above-mentioned working principle to complete the electrical connection, which are all well-known technologies in the art.

[0036] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A double-drum waste heat boiler, comprising a shell (3), characterized in that: An upper drum (1) is installed at the upper part of the shell (3), a lower drum (2) is installed at the lower part of the shell (3), a furnace (6) is arranged inside the shell (3), a convection tube bundle (4) is vertically installed in the middle of the furnace (6), an evaporation heating surface flue is arranged between the upper drum (1) and the lower drum (2), the convection tube bundle (4) is arranged inside the evaporation heating surface flue, the top end of the convection tube bundle (4) is connected to the upper drum (1), the bottom end of the convection tube bundle (4) is connected to the lower drum (2), furnace flues are arranged outside the two sides of the evaporation heating surface flue, the furnace flue includes left and right flues, a superheater (5) and a primary smoke separation device (8) are arranged inside one flue, and a secondary smoke separation device (9) and an economizer (7) are arranged inside the other flue; A base (31) is installed at the bottom of the shell (3), a steel frame (32) is installed on the base (31) at the outer side of the shell (3), and a sewage pipe (33) is installed on one side of the base (31); A water spray desuperheater (10) is installed on the top of the steel frame (32); Platform ladders (34) are installed on the outside of both sides of the shell (3), and the middle part of the platform ladder (34) is fixed on the steel frame (32); A flue gas inlet (35) is provided at one end of the shell (3) near the superheater (5), and a flue gas outlet (36) is provided at the other end of the shell (3) near the lower drum (2). The flue gas inlet (35) is connected to one end of a primary smoke separation device (8), the other end of the primary smoke separation device (8) is connected to one end of a secondary smoke separation device (9), the other end of the secondary smoke separation device (9) is connected to an economizer (7), and the output end of the economizer (7) is connected to the flue gas outlet (36).

2. The double-drum waste heat boiler according to claim 1, characterized in that: The top of the superheater (5) is connected to the upper boiler drum (1) and the superheater header (52) respectively through two superheater connecting pipes (51).

3. The double-drum waste heat boiler according to claim 1, characterized in that: The outer wall of the furnace (6) is provided with a heat-insulating layer (62), and the bottom of the furnace (6) is provided with an ash cleaning port (63).

4. The double-drum waste heat boiler according to claim 1, characterized in that: The evaporation heating surface flue is composed of furnace membrane wall tubes (61); the furnace flue is composed of furnace membrane wall tubes (61) and the evaporation heating surface membrane wall (41).

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