Large module assembled boiler with three-drum structure

Abstract

The utility model discloses a large-scale boiler with a module assembled three-drum structure. The large-scale boiler comprises a boiler body, a connecting flue, an energy saver, an air pre-heater and an overhead steam drum assembly, the overhead steam pocket assembly is arranged at the top of the boiler body; the boiler body comprises an upper boiler barrel, a lower boiler barrel, a hearth middle membrane wall, a hearth right membrane wall, a convection bank group, a downcomer, a hearth steam-water outlet pipe and a convection bank steam-water outlet pipe, and a partition plate is arranged in the upper boiler barrel and divides the upper boiler barrel into a first inner cavity and a second inner cavity. According to the boiler, independent spaces are formed under the action of the partition plates, different convection banks can be collected conveniently and then collected into the overhead steam pocket assembly, the steam outlet rate of the boiler is increased, all the units are arranged in a modularized mode, the structure is compact, the independent overhead steam pocket assembly is arranged, the evaporation capacity of the boiler can be increased to the maximum, and the boiler is more energy-saving and environment-friendly. And on-site installation is convenient, and the construction period is short.

Description

Technical Field

[0001] The utility model relates to the technical field of three-drum structure boilers, in particular to a large-scale module-assembled three-drum structure boiler. Background Art

[0002] A boiler is an energy conversion device. The energy input to the boiler includes chemical energy from the fuel and electrical energy, and the boiler outputs a certain amount of thermal energy in the form of steam, high-temperature water, or an organic heat carrier. With economic development, the demand for evaporation capacity per boiler is increasing, from an initial 75t / h to 90t / h and even 100t / h, and the tonnage demand is growing.

[0003] As the tonnage increases, the built-in upper drum also needs to be larger. However, due to transportation size limitations, this type of boiler generally can only achieve a maximum evaporation capacity of 50t / h. To cope with larger tonnage boilers, the existing technology adds an external drum to cooperate with the built-in upper and lower drums to form a three-drum boiler structure. The modular assembly structure allows it to be disassembled for transportation and reassembled on site. For existing three-drum boilers, the upper and lower drums are connected by front, rear, left, and right membrane walls and convection tube bundles. The steam-water mixture after heat absorption is collected in the upper drum, and the hot water then flows into the membrane walls through the convection tubes. In the above process, due to the different heat absorption of the membrane walls at different positions, the temperature of the steam-water mixture collected in the upper drum also varies, which also affects the steam output rate of the boiler. Utility Model Content

[0004] In order to overcome the deficiencies of the prior art, the utility model provides a large-scale modular assembled three-drum structure boiler to solve the above-mentioned traditional problems.

[0005] The utility model is implemented by the following technical solutions:

[0006] A large modular three-drum boiler comprises a boiler body, a connecting flue, an economizer, an air preheater, and an overhead steam drum assembly; the economizer is connected to the flue gas outlet of the boiler body via the connecting flue, the air preheater is mounted at the rear end of the economizer, and the overhead steam drum assembly is placed on top of the boiler body;

[0007] The boiler body includes an upper drum, a lower drum, a furnace middle membrane wall, a furnace right membrane wall, a convection tube bundle group, a downcomer, a furnace steam-water outlet pipe and a convection tube bundle steam-water outlet pipe. A partition is provided inside the upper drum, and the partition divides the upper drum into a first inner cavity and a second inner cavity. The upper part of the first inner cavity is connected to the top steam drum assembly through the convection tube bundle steam-water outlet pipe, and the lower part of the first inner cavity is connected to the lower drum through the convection tube bundle group; the upper part of the second inner cavity is connected to the top steam drum assembly through the furnace steam-water outlet pipe, and the lower part of the second inner cavity is connected to the lower drum through the furnace middle membrane wall and the furnace right membrane wall; the lower drum is connected to the top steam drum assembly through the downcomer.

[0008] Preferably, the partition is in an L-shaped structure.

[0009] Preferably, the partition includes a first plate, a second plate and a third plate, one end of the first plate is connected to the upper inner wall of the upper boiler drum, the other end of the first plate is connected to one end of the second plate, one end of the third plate is connected to the lower inner wall of the upper boiler drum, and the other end of the third plate is connected to the other end of the second plate.

[0010] Preferably, a first overlapping portion is provided between the first plate and the second plate, and a second overlapping portion is provided between the second plate and the third plate.

[0011] Preferably, the overhead steam drum assembly includes an overhead steam drum body, a water supply distribution pipe arranged in the overhead steam drum body, a steam-water separation device and a steam collecting box arranged on the top of the overhead steam drum body; the overhead steam drum body is provided with a surface sewage discharge pipe and a dosing pipe; the water supply distribution pipe includes a water supply connector and a water supply distribution pipe, and the water supply distribution pipe is fixed in the overhead steam drum body through the water supply connector; the steam-water separation device includes a frame and a steam uniforming orifice plate, and the steam uniforming orifice plate is suspended on the top of the overhead steam drum body through the frame.

[0012] Preferably, a sewage discharge device and a sewage discharge pipe seat are provided at the bottom of the lower drum.

[0013] Preferably, the boiler body also includes a front membrane wall, a rear membrane wall, an upper header and a lower header. The tops of the front membrane wall and the rear membrane wall are respectively connected to the upper boiler drum through the upper header, and the tops of the front membrane wall and the rear membrane wall are respectively connected to the lower boiler drum through the lower header.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] The large modular assembled three-drum structure boiler of the utility model is provided with a partition in the upper drum. Through the action of the partition, the upper drum is divided into two cavities to form independent spaces, which is convenient for collecting convection tube bundles from different parts and then collecting them into the top steam drum assembly to improve the steam output rate of the boiler. Each unit adopts a modular setting with a compact structure and is equipped with an independent top steam drum assembly, which can maximize the evaporation capacity of the boiler to meet the tonnage requirements. It is easy to install on site and has a short construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a front view of a large modular three-drum boiler of the present invention;

[0017] Figure 2 for Figure 1 A top view of a large modular three-drum boiler is shown;

[0018] Figure 3 for Figure 2 The cross-section of a large modular three-drum boiler is shown;

[0019] Figure 4 for Figure 1 The side view of a large modular three-drum boiler is shown;

[0020] Figure 5 for Figure 4 A cross-sectional view of a large modular three-drum boiler is shown;

[0021] Figure 6 for Figure 1 An interior view of the overhead steam drum assembly is shown;

[0022] Figure 7 for Figure 6 A first cross-sectional view of the overhead steam drum assembly is shown;

[0023] Figure 8 for Figure 6 a second cross-sectional view of the overhead steam drum assembly shown;

[0024] Figure 9 for Figure 4 A cross-sectional view of the upper drum shown;

[0025] Figure 10 for Figure 5 A cross-sectional view of the lower drum is shown.

[0026] In the figure: 10, boiler body; 11, upper drum; 110, partition; 12, lower drum; 120, sewage discharge device; 13, middle membrane wall of furnace; 14, membrane wall on the right side of furnace; 15, convection tube bundle group; 16, downcomer; 17, steam-water outlet pipe of furnace; 18, steam-water outlet pipe of convection tube bundle; 20, connecting flue; 30, economizer; 40, air preheater; 50, overhead steam drum assembly; 51, overhead steam drum body; 52, feed water distribution pipe; 53, steam-water separation device; 54, steam collecting box. DETAILED DESCRIPTION

[0027] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the following detailed description of specific embodiments of the present invention is provided in conjunction with the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0028] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0029] In the description of the present invention, it should be understood that when an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be intermediate elements at the same time. On the contrary, when an element is said to be "directly" connected to another element, there are no intermediate elements.

[0030] See also Figures 1-10 , which is a large modular assembled three-drum structure boiler in a preferred embodiment of the present invention, including a boiler body 10, a connecting flue 20, an economizer 30, an air preheater 40 and a top steam drum assembly 50. The boiler body 10, the connecting flue 20, the economizer 30, the air preheater 40, the top steam drum assembly 50 and other components can be connected through on-site steam-water pipelines to form a boiler as a whole, which is convenient for transportation. Among them, the economizer 30 is connected to the flue gas outlet of the boiler body 10 through the connecting flue 20, the air preheater 40 is installed at the rear end of the economizer 30, and the top steam drum assembly 50 is placed on the top of the boiler body 10.

[0031] The boiler body 10 is generally a double-drum longitudinal D-shaped structure, wherein the boiler body 10 includes an upper drum 11, a lower drum 12, a furnace middle membrane wall 13, a furnace right membrane wall 14, a convection tube bundle group 15, a downcomer 16, a furnace steam-water outlet pipe 17 and a convection tube bundle steam-water outlet pipe 18. A partition 110 is provided inside the upper drum 11, and the partition 110 divides the upper drum 11 into a first inner cavity and a second inner cavity. The upper part of the first inner cavity is connected to the upper drum 11. The steam-water outlet pipe 18 through the convection tube bundle is connected to the overhead steam drum assembly 50, and the lower part of the first inner cavity is connected to the lower boiler drum 12 through the convection tube bundle group 15; the upper part of the second inner cavity is connected to the overhead steam drum assembly 50 through the furnace steam-water outlet pipe 17, and the lower part of the second inner cavity is connected to the lower boiler drum 12 through the furnace middle membrane wall 13 and the furnace right membrane wall 14; the lower boiler drum 12 is connected to the overhead steam drum assembly 50 through the downcomer 16.

[0032] A furnace flue is formed between the membrane wall 14 on the right side of the furnace and the membrane wall 13 in the middle of the furnace, and a combustion chamber is formed between the convection tube bundle group 15 and the membrane wall 13 in the middle of the furnace. Since the high-temperature flue gas mainly flushes horizontally from front to back between the membrane wall 14 on the right side of the furnace and the membrane wall 13 in the middle of the furnace, the area formed between the membrane wall 14 on the right side of the furnace and the membrane wall 13 in the middle of the furnace is a simple heated rising area. After the system water in the tube absorbs the radiant heat of the flame, it forms a steam-water mixture, which is collected in the second inner cavity of the upper drum 11, and then collected to the top steam drum assembly 50 through the furnace steam-water outlet pipe 17. The convection tube bundle group 15 is the convection tube bundle area, located to the left of the middle membrane wall 13 of the furnace and placed in the combustion chamber. The flue gas also flushes the convection tube bundle horizontally from back to front. The flue gas in the convection tube bundle area will gradually cool down, forming a high-temperature flue gas zone and a low-temperature flue gas zone in the entire convection tube bundle area. Due to the different heat absorption of the working fluid in the high-temperature zone and the low-temperature zone, the working fluid density in the two zones is also different. The steam-water outlet pipe 18 of the convection tube bundle in the high-temperature zone mainly causes steam and water to rise, while the steam-water outlet pipe 18 of the convection tube bundle in the low-temperature zone mainly causes water to fall. There is no fixed dividing point between the two. The dividing point between the rising and falling will self-balance with the change of boiler load.

[0033] In the structure of the above boiler body 10, the upper drum 11 is divided into two cavities by the action of the partition 110, forming independent spaces, which is convenient for collecting convection tube bundles from different groups and then collecting them into the top steam drum assembly 50 to increase the steam output rate of the boiler. Each unit adopts a modular setting with a compact structure and is equipped with an independent top steam drum assembly 50, which can maximize the boiler evaporation capacity to meet the tonnage requirements, facilitate on-site installation, and shorten the construction period.

[0034] In this embodiment, if Figure 9As shown, the partition 110 is generally L-shaped. Specifically, the partition 110 includes a first plate, a second plate, and a third plate. One end of the first plate is connected to the upper inner wall of the upper drum 11, the other end of the first plate is connected to one end of the second plate, one end of the third plate is connected to the lower inner wall of the upper drum 11, and the other end of the third plate is connected to the other end of the second plate. This allows the partition 110 to expand and contract with heat better. Optionally, a first overlapping portion is provided between the first and second plates, and a second overlapping portion is provided between the second and third plates to further enhance the thermal expansion and contraction effect.

[0035] like Figure 6-Figure 8 The top drum assembly 50 includes a top drum body 51, a water supply distribution pipe 52 provided in the top drum body 51, a steam-water separation device 53, and a steam collecting box 54 provided on the top of the top drum body 51. The top drum body 51 is provided with a surface sewage pipe and a dosing pipe. The surface sewage pipe is used to discharge sewage from the top drum body 51, and the dosing pipe is used to add drugs, such as defoaming agents, to the top drum body 51. The water supply distribution pipe 52 includes a water supply socket and a water supply distribution pipe 52. The water supply distribution pipe 52 is fixed in the top drum body 51 through the water supply socket so that the system water from the economizer 30 can be evenly distributed in the top drum body 51. The steam-water separation device 53 includes a frame and a steam uniformity plate. The steam uniformity plate is suspended on the top of the top drum body 51 through the frame to reduce the moisture carried by the steam, and then collects it in the steam collecting box 54.

[0036] like Figure 10 As shown, a sewage discharge device 120 and a sewage discharge pipe seat are provided at the bottom of the lower drum 12 to achieve regular sewage discharge.

[0037] In other embodiments, the boiler body 10 also includes a front membrane wall, a rear membrane wall, an upper header and a lower header. The tops of the front membrane wall and the rear membrane wall are respectively connected to the upper boiler drum 11 through the upper header, and the tops of the front membrane wall and the rear membrane wall are respectively connected to the lower boiler drum 12 through the lower header.

[0038] Optionally, the large modular assembled three-drum structure boiler also includes a platform escalator, pipelines and valve instruments. The safety performance of the equipment is improved by configuring the platform escalator and various valve instrument equipment.

[0039] The working principle of the above large modular three-drum boiler is as follows:

[0040] 1. Air flow direction:

[0041] The air passes through the air preheater 40 to be preheated, and then is transported to the burner of the boiler body 10, mixed with the fuel gas, and burned in the furnace to generate high-temperature flue gas.

[0042] 2. Flue gas process:

[0043] After the mixture of gas and air is burned by the burner, the high-temperature flue gas generated passes through the furnace of the boiler body 10 in sequence, through the heating surfaces such as the membrane wall 13 in the middle of the furnace and the membrane wall 14 on the right side of the furnace, and is flushed from front to back for radiation and convection heat exchange. After passing through the combustion chamber, it is flushed from back to front, flushing the convection tube bundle group 15 in sequence, and then enters the economizer 30 and the air preheater 40 through the connecting flue 20. The flue gas is finally discharged into the atmosphere.

[0044] 3. Soda process:

[0045] The boiler feed water heated by the economizer 30 is evenly distributed to the interior of the overhead drum through the feed water distribution pipe 52 inside the overhead drum, and is led to the lower drum 12 along the unheated downcomer 16 to supply the heating surface of the furnace and the heating surface of the convection tube bundle respectively.

[0046] The feed water is heated into a steam-water mixture in the furnace membrane wall and the convection tube bundle. The steam-water mixture in the two areas enters the overhead steam drum through their respective steam-water outlet pipes. The steam-liquid separation is carried out under the action of the steam-water separation device 53 inside the overhead steam drum. The separated water then enters the lower boiler drum 12 along the downcomer 16 for circulation. The separated steam is collected through the steam collecting box 54 and then provided to the outside.

[0047] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0048] The above-described embodiments merely represent several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.

Claims

1. A large modular three-drum boiler, characterized in that: The boiler comprises a boiler body, a connecting flue, an economizer, an air preheater and a top-mounted steam drum assembly; the economizer is connected to the flue gas outlet of the boiler body through the connecting flue, the air preheater is installed at the rear end of the economizer, and the top-mounted steam drum assembly is placed on the top of the boiler body; The boiler body includes an upper drum, a lower drum, a furnace middle membrane wall, a furnace right membrane wall, a convection tube bundle group, a downcomer, a furnace steam-water outlet pipe and a convection tube bundle steam-water outlet pipe. A partition is provided inside the upper drum, and the partition divides the upper drum into a first inner cavity and a second inner cavity. The upper part of the first inner cavity is connected to the top steam drum assembly through the convection tube bundle steam-water outlet pipe, and the lower part of the first inner cavity is connected to the lower drum through the convection tube bundle group; the upper part of the second inner cavity is connected to the top steam drum assembly through the furnace steam-water outlet pipe, and the lower part of the second inner cavity is connected to the lower drum through the furnace middle membrane wall and the furnace right membrane wall; the lower drum is connected to the top steam drum assembly through the downcomer.

2. The large modular assembled three-drum structure boiler according to claim 1 is characterized in that: The partition is in an L-shaped structure.

3. The large modular assembled three-drum structure boiler according to claim 2 is characterized in that: The partition includes a first plate, a second plate and a third plate, one end of the first plate is connected to the upper inner wall of the upper boiler drum, the other end of the first plate is connected to one end of the second plate, one end of the third plate is connected to the lower inner wall of the upper boiler drum, and the other end of the third plate is connected to the other end of the second plate.

4. The large modular assembled three-drum structure boiler according to claim 3 is characterized in that: A first overlapping portion is provided between the first plate and the second plate, and a second overlapping portion is provided between the second plate and the third plate.

5. The large modular assembled three-drum structure boiler according to claim 1 is characterized in that: The overhead steam drum assembly includes an overhead steam drum body, a water supply distribution pipe arranged in the overhead steam drum body, a steam-water separation device and a steam collecting box arranged on the top of the overhead steam drum body; the overhead steam drum body is provided with a surface sewage discharge pipe and a dosing pipe; the water supply distribution pipe includes a water supply connector and a water supply distribution pipe, and the water supply distribution pipe is fixed in the overhead steam drum body through the water supply connector; the steam-water separation device includes a frame and a steam uniforming orifice plate, and the steam uniforming orifice plate is suspended on the top of the overhead steam drum body through the frame.

6. The large modular assembled three-drum structure boiler according to claim 1 is characterized in that: A sewage discharge device and a sewage discharge pipe seat are provided at the bottom of the lower drum.

7. The large modular assembled three-drum structure boiler according to claim 1 is characterized in that: The boiler body also includes a front membrane wall, a rear membrane wall, an upper header and a lower header. The tops of the front membrane wall and the rear membrane wall are respectively connected to the upper boiler drum through the upper header, and the tops of the front membrane wall and the rear membrane wall are respectively connected to the lower boiler drum through the lower header.

Images