Boiler waste heat utilization device

Abstract

The utility model belongs to the technical field of boilers, and particularly relates to a boiler waste heat utilization device which comprises a boiler inner container, the boiler inner container is installed on a bottom plate, a boiler shell covers the bottom plate, a water cavity is formed among the boiler shell, the boiler inner container and the bottom plate, and a water inlet and a water outlet are formed in the boiler shell. The boiler inner container comprises a combustion chamber and a plurality of heat source bodies, the adjacent heat source bodies are communicated through transverse pipes and form an S-shaped channel, the combustion chamber is communicated with the S-shaped channel, heat source body pipes are inserted into the heat source bodies, the combustion chamber is communicated with an air inlet, a reverse combustion furnace door, a forward combustion furnace door and an ash removal door, and an upper furnace branch pipe and a lower furnace branch pipe are inserted into the combustion chamber at intervals up and down. The S-shaped channel communicates with an air inlet of the induced draft fan. The stratified combustion bin is designed to adapt to fuels of different volumes, sufficient combustion of the fuels is ensured, the energy utilization rate is increased, waste heat can be efficiently recycled through a serpentine channel, and energy consumption and thermal pollution are reduced. The device is small in size, the installation difficulty and cost can be reduced, and the application scene is widened.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of boiler, concretely relates to a boiler waste heat utilization device. BACKGROUND

[0002] Boiler as the main heat conversion equipment is widely used in each field, such as chemical industry, food processing, heating etc., however, the traditional boiler equipment has obvious deficiency in the operation process.

[0003] From the energy utilization angle, the traditional boiler adopts single combustion area, lacks the pertinence processing of different volume fuels, and the fuel of larger volume can not be completely combusted in limited time and be discharged, causing fuel waste, and the fuel of small volume can also be insufficiently combusted due to poor combustion environment, produces a large amount of carbon monoxide and other incomplete combustion products, not only reduces energy utilization rate, but also pollutes the environment, in addition, the traditional boiler is insufficient in high-temperature flue gas waste heat utilization, and the high-temperature flue gas containing a large amount of heat energy is directly discharged without full utilization, causing energy waste, and also causing the environmental temperature to rise and aggravating heat pollution.

[0004] In addition, the traditional boiler volume is usually large, and the installation manufacturing cost is high, and a large space is needed in the installation process, and for some space-limited places, such as small factories, old buildings etc., the installation of traditional boiler can face the problem of insufficient space, limiting its application range. UTILITY MODEL CONTENT

[0005] In view of the above problems, the purpose of the utility model is to provide a boiler waste heat utilization device, to solve the problems of low energy utilization efficiency and poor installation applicability of the existing boiler equipment.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a boiler waste heat utilization device, comprising a boiler inner liner, which is installed on a base plate. A boiler outer shell is fitted and welded to the outer side of the boiler inner liner and the base plate. A water cavity for containing water is formed between the boiler outer shell, the boiler inner liner, and the base plate. An inlet, an outlet, and a drain valve communicating with the water cavity are installed on the boiler outer shell. The boiler inner liner includes a combustion chamber and multiple heat sources. Adjacent heat sources are connected by horizontal pipes to form a serpentine channel structure. The combustion chamber and the serpentine channel are connected by connecting pipes. Multiple heat source pipes communicating with the water cavity are inserted through the heat source. The combustion chamber has an air inlet on one side. From top to bottom, the combustion chamber has a reverse-fire furnace door, a forward-fire furnace door, and an ash removal door. The upper and lower furnace branch pipes, which connect to the water chamber, are respectively inserted and inserted between the reverse-fire furnace door and the forward-fire furnace door, and between the forward-fire furnace door and the ash removal door. The reverse-fire furnace door, the forward-fire furnace door, the ash removal door, and the air inlet all connect the interior of the combustion chamber to the exterior of the boiler shell. A boiler inspection door is installed at the connection between the boiler shell and the reverse-fire furnace door, the forward-fire furnace door, the ash removal door, and the air inlet. An external pipe is inserted and welded onto the boiler shell. One end of the external pipe is connected to a serpentine channel, and the other end of the external pipe is connected to the air inlet of the induced draft fan.

[0007] The beneficial effects of this utility model are as follows: Through the layered combustion chamber design, the difference in spacing between the upper and lower furnace branch pipes can accommodate fuels of different volumes, ensuring complete combustion of fuel, reducing waste, and improving energy utilization; the flue gas from the combustion chamber enters the serpentine channel through the connecting pipe, and the horizontally intersecting heat source pipes promote uniform distribution of water and uniform filling of flue gas, reduce dead zones, enhance heat exchange, efficiently recover waste heat, and reduce energy consumption and thermal pollution; this device is compact in size, which can reduce installation difficulty and cost, and broaden application scenarios.

[0008] In order to efficiently burn and utilize the fuel put into the combustion chamber;

[0009] As a further improvement to the above technical solution: there are multiple upper furnace branch pipes and lower furnace branch pipes, which are arranged horizontally in a single row, and the distance between adjacent upper furnace branch pipes is not less than the distance between adjacent lower furnace branch pipes.

[0010] The beneficial effects of this improvement are as follows: the upper furnace branch pipe can support fuel with a larger volume, and the lower furnace branch pipe can support fuel with a smaller volume after combustion or fuel with a smaller volume itself. The layered design of the combustion chamber allows the fuel consumed by combustion at the top to fall onto the lower furnace branch pipe through the large gap between adjacent upper furnace branch pipes. After being fully burned at the main combustion furnace door, it turns into slag and falls onto the ash removal door through the small gap between adjacent lower furnace branch pipes.

[0011] In order to fully improve the combustion and heating efficiency of the combustion chamber;

[0012] As a further improvement of the above technical solution: the air inlet is arranged on the side surface of the combustion chamber opposite to the connecting pipe.

[0013] The beneficial effect of the improvement is that the air inlet arranged in the opposite and staggered direction can make the external air quickly heated in the combustion chamber under the suction of the induced draft fan, and smoothly enter the heat source body to exchange heat with the water in the water cavity, avoiding excessive air flow resistance affecting the combustion and heating efficiency of the combustion chamber.

[0014] In order to effectively improve the heat exchange efficiency of the flue gas and water on both sides of the heat source pipe;

[0015] As a further improvement of the above technical solution: the heat source pipe is horizontally installed on the heat source body.

[0016] The beneficial effect of the improvement is that the horizontally installed heat source pipe can uniformly distribute the water in the heat source pipe, avoid local overheating affecting the heat exchange efficiency, and can make the water flow rate in the water cavity uniform, improve the stability of heat exchange, and in addition, the horizontal installation method also facilitates personnel to maintain and clean the heat source pipe.

[0017] In order to further improve the heat exchange efficiency of the flue gas and water on both sides of the heat source pipe;

[0018] As a further improvement of the above technical solution: the heat source pipes adjacent to each other are arranged in a staggered manner.

[0019] The beneficial effect of the improvement is that the staggered arrangement of the heat source pipes can guide the flue gas to uniformly fill the inside of the heat source body, reduce the flow dead zone and deflection phenomenon, make the fluid flow rate and temperature distribution around each heat source pipe more consistent, fully utilize the heat transfer capacity of each heat source pipe, and improve the stability of the overall heat exchange effect.

[0020] In order to realize the centralized treatment and discharge of flue gas;

[0021] As a further improvement of the above technical solution: the air outlet of the induced draft fan is communicated with the side surface of the chimney, and the axis of the chimney is perpendicular to the bottom surface of the bottom plate.

[0022] The beneficial effect of the improvement is that the chimney can facilitate the device to connect the subsequent flue gas treatment system, so that the flue gas is discharged in an environmentally friendly manner.

[0023] In order to further improve the maintenance convenience of the device;

[0024] As a further improvement of the above technical solution: the bottom side of the heat source body is connected with a dust removal door.

[0025] The beneficial effect of the improvement is that after the boiler inspection door installed outside the ash removal door is opened, the operator can conveniently clean the smoke dust at the bottom of the heat source body and the combustion chamber.

[0026] In order to further improve the convenience of the device maintenance;

[0027] As a further improvement of the above technical solution: the outer pipe is located at the bottom of the chimney and the one end port of the boiler shell is provided with a blind plate.

[0028] The beneficial effect of the improvement is that the blind plate is movably connected with the chimney and the outer pipe through the clamp or bolt, so that the inner part of the outer pipe and the chimney can be conveniently disassembled and cleaned.

[0029] In order to effectively ensure the heating efficiency of the device on the water body;

[0030] As a further improvement of the above technical solution: the water inlet is arranged at the bottom of the side surface of the boiler shell on the side of the combustion chamber, and the water outlet is arranged at the top of the side surface of the boiler shell away from the combustion chamber.

[0031] The beneficial effect of the improvement is that the flowing water from low to high can form stable convection, and the heat exchange area in the boiler shell is fully utilized.

[0032] The parts not involved in the device are the same as or can be realized by the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 Structure diagram of the utility model Figure One ;

[0034] Figure 2 Structure diagram of the utility model without boiler shell Figure One ;

[0035] Figure 3 Structure diagram of the utility model Figure Two ;

[0036] Figure 4 Structure diagram of the utility model without boiler shell Figure Two ;

[0037] In the figure: 1, boiler shell; 2, boiler inner bag; 3, combustion chamber; 4, heat source body; 5, bottom plate; 6, upper furnace branch pipe; 7, lower furnace branch pipe; 8, reverse burning furnace door; 9, normal burning furnace door; 10, ash removal door; 11, connecting pipe; 12, cross pipe; 13, heat source body pipe; 14, boiler inspection door; 15, outer pipe; 16, induced draft fan; 17, chimney; 18, blind plate; 19, air inlet; 20, water inlet; 21, water outlet; 22, drain valve. DETAILED DESCRIPTION

[0038] In order to make the skilled in the art better understand the technical solutions of the present application, the present application is described in detail below in combination with the drawings, and the description in this part is only exemplary and explanatory, and should not have any limiting effect on the protection scope of the present application.

[0039] As Figure 1A boiler waste heat utilization device, comprising a boiler liner 2 installed on a bottom plate 5, an outer cover of the boiler liner 2 and the bottom plate 5 being welded with a boiler shell 1, the boiler shell 1 being formed with a water cavity for containing water between the boiler liner 2 and the bottom plate 5, the boiler shell 1 being installed with a water inlet 20, a water outlet 21 and a drain valve 22 communicating with the water cavity, the boiler liner 2 comprising a combustion chamber 3 and a plurality of heat source bodies 4, adjacent heat source bodies 4 being communicated by a cross pipe 12 and forming a serpentine channel structure, the combustion chamber 3 being communicated with the serpentine channel through a connecting pipe 11, the heat source body 4 being inserted with a plurality of heat source body pipes 13 communicating with the water cavity, one side of the combustion chamber 3 being communicated with an air inlet 19, the combustion chamber 3 being communicated from top to bottom with a reverse burning furnace door 8, a normal burning furnace door 9 and an ash removal door 10, the combustion chamber 3 between the reverse burning furnace door 8 and the normal burning furnace door 9 and between the normal burning furnace door 9 and the ash removal door 10 being respectively inserted with an upper furnace branch pipe 6 and a lower furnace branch pipe 7 communicating with the water cavity, the reverse burning furnace door 8, the normal burning furnace door 9, the ash removal door 10 and the air inlet 19 all communicating the inside of the combustion chamber 3 with the outside of the boiler shell 1, and the boiler shell 1 being installed with a boiler inspection door 14 at the connection of the reverse burning furnace door 8, the normal burning furnace door 9, the ash removal door 10 and the air inlet 19, the boiler shell 1 being inserted and welded with an outer pipe 15, one end of the outer pipe 15 being communicated with the serpentine channel, the other end of the outer pipe 15 being connected with the air inlet of an induced draft fan 16, through the design of the layered combustion chamber, the spacing difference between the upper furnace branch pipe 6 and the lower furnace branch pipe 7 can adapt to different volume fuels, ensure the full combustion of the fuels, reduce waste and improve energy utilization rate; the flue gas of the combustion chamber 3 enters the serpentine channel through the connecting pipe 11, the horizontally staggered heat source body pipes 13 promote the uniform distribution of the water and the uniform filling of the flue gas, reduce the flow dead zone, strengthen heat exchange, efficiently recover waste heat, reduce energy consumption and thermal pollution.The device is small in size, can reduce installation difficulty and cost, and can widen application scenarios, the number of the upper furnace branch pipes 6 and the lower furnace branch pipes 7 is multiple, and the upper furnace branch pipes 6 and the lower furnace branch pipes 7 are arranged in a single row in a horizontal manner, the spacing between adjacent upper furnace branch pipes 6 is not less than the spacing between adjacent lower furnace branch pipes 7, the upper furnace branch pipes 6 on the upper side can support fuel with a larger volume, the lower furnace branch pipes 7 on the lower side can support fuel with a smaller volume after combustion or fuel with a smaller volume, the layered combustion chamber makes the fuel on the upper side, which is consumed in volume after combustion, fall on the lower furnace branch pipes 7 through the large-size gap between adjacent upper furnace branch pipes 6, and then fall on the ash removal door 10 through the small-size gap between adjacent lower furnace branch pipes 7 after being fully combusted at the furnace door 9, the air inlet 19 is arranged on the side surface of the combustion chamber 3 away from the connecting pipe 11, the air inlet 19 and the connecting pipe 11 are arranged in a direction opposite to each other and staggered in a vertical manner, so that external air can be quickly heated by the combustion chamber 3 under the suction of the induced draft fan 16 and then smoothly enter the heat source body 4 to exchange heat with the water in the water cavity, so as to avoid that the air flow resistance is too large to affect the combustion and heating efficiency of the combustion chamber 3, the heat source body pipe 13 is horizontally arranged on the heat source body 4, so that the water can be uniformly distributed in the heat source body pipe 13, the flow rate of the water in the water cavity is uniformly distributed, the stability of heat exchange is improved, in addition, the horizontal arrangement facilitates the maintenance and cleaning of the heat source body pipe 13, the heat source body pipes 13 adjacent to each other are arranged in a left-right staggered manner, the heat source body pipes 13 arranged in a staggered manner can guide the flue gas to uniformly fill the inside of the heat source body 4, reduce the flow dead zone and the flow deviation phenomenon, make the flow rate and temperature distribution of the fluid around each heat source body pipe 13 more consistent, fully exert the heat transfer capacity of each heat source body pipe 13, and improve the stability of the overall heat exchange effect, the air outlet of the induced draft fan 16 is communicated with the side surface of the chimney 17, the axis of the chimney 17 is perpendicular to the bottom surface of the bottom plate 5, the chimney 17 can facilitate the connection of the device with a subsequent flue gas treatment system, so that the flue gas can be discharged in an environmentally friendly manner, the bottom side of the heat source body 4 is connected with the ash removal door 10, after the boiler inspection door 14 installed on the outside of the opened ash removal door 10, the operator can conveniently clean the soot at the bottom of the heat source body 4 and the combustion chamber 3, the blind plate 18 is arranged at the bottom of the chimney 17 and the end port of the outer pipe 15 located outside the boiler shell 1, the blind plate 18 is movably connected with the chimney 17 and the outer pipe 15 through a clamp or a bolt, so that the blind plate 18 can be conveniently disassembled, and the inside of the outer pipe 15 and the chimney 17 can be quickly cleaned by the personnel, the water inlet 20 is arranged at the bottom of the side surface of the boiler shell 1 on one side of the combustion chamber 3, and the water outlet 21 is arranged at the top of the side surface of the boiler shell 1 away from the combustion chamber 3, the water flowing from low to high can form stable convection, and the heat exchange area in the boiler shell 1 is fully utilized.

[0040] The working principle of the technical solution is as follows: the fuel is put into the combustion chamber 3 by opening the reverse burning furnace door 8 or the normal burning furnace door 9. The fuel with a large volume will fall on the upper furnace branch pipe 6. As the combustion proceeds, the volume of the fuel gradually decreases, and the fuel will fall on the lower furnace branch pipe 7 through the large-size gap between adjacent upper furnace branch pipes 6 to continue combustion. During the combustion process, the air entering from the air inlet 19 is fully mixed with the fuel under the suction of the induced draft fan 16, thereby providing sufficient oxygen for combustion. Since the air inlet 19 is arranged on the side surface of the combustion chamber 3 opposite to the connecting pipe 11, the air inlet 19 and the connecting pipe 11 are arranged in a direction opposite to each other and staggered vertically, so that the external air can be quickly heated in the combustion chamber 3 under the suction of the induced draft fan 16 and smoothly enter the heat source body 4 to realize heat exchange with the water body in the water cavity, thereby avoiding that the air flow resistance is too large to affect the combustion and heating efficiency of the combustion chamber 3. The high-temperature flue gas generated by the combustion of the fuel in the combustion chamber 3 enters the serpentine passage composed of multiple heat source bodies 4 and horizontal pipes 12 through the connecting pipe 11. In the heat source body 4, the horizontally arranged heat source body pipe 13 enables the water body to be uniformly distributed therein, thereby avoiding that local overheating affects the heat exchange efficiency and enabling the water body in the water cavity to be uniformly distributed in flow rate, thereby improving the stability of heat exchange. The upper and lower adjacent heat source body pipes 13 are arranged in a left-right staggered manner, thereby guiding the flue gas to uniformly fill the inside of the heat source body 4, reducing the flow dead zone and flow deviation phenomenon, making the fluid flow rate and temperature distribution around each heat source body pipe 13 more consistent, fully exerting the heat transfer capacity of each heat source body pipe 13, realizing efficient heat exchange, and enabling the water body in the water cavity to enter through the water inlet 20. Since the water inlet 20 is arranged at the bottom of the side surface of the boiler shell 1 located on one side of the combustion chamber 3, and the water outlet 21 is arranged at the top of the side surface of the boiler shell 1 away from the combustion chamber 3, the water body flowing from low to high can form a stable convection, thereby fully utilizing the heat exchange area in the boiler shell 1 and effectively ensuring the heating efficiency of the device on the water body. The heated hot water flows out from the water outlet 21 and can be used for industrial production or life heating, etc. The flue gas after heat exchange is sucked by the induced draft fan 16 through the outer pipe 15 and discharged to the chimney 17.

[0041] The boiler inspection door 14 installed outside the soot cleaning door 10 is regularly opened to clean the soot at the bottom of the heat source body 4 and the combustion chamber 3. Since the bottom side of the heat source body 4 is connected with the soot cleaning door 10, the operator can conveniently complete the cleaning work. The blind plate 18 at the end port of the outer pipe 15 outside the boiler shell 1 and the bottom of the chimney 17 is regularly disassembled to clean the inside. The blind plate 18 is movably connected with the chimney 17 and the outer pipe 15 by means of a clamp or a bolt, thereby facilitating quick disassembly and installation.

[0042] It should be noted that, in this document, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0043] The principles and implementations of the present application are described herein with specific examples. The above examples are only used to help understand the method of the present application and its core idea. The above description is only the preferred embodiments of the present application. It should be noted that due to the limitation of language expression, there are objectively infinite specific structures. For ordinary skilled persons in the art, without departing from the principles of the present application, some improvements, refinements or changes can be made, or the above technical features can be combined in an appropriate manner. These improvements, refinements, changes or combinations, or the application of the inventive concept and technical solution to other occasions without improvement, shall be regarded as the protection scope of the present application.

Claims

1. A boiler waste heat recovery device, characterized in that: The boiler includes a boiler inner liner (2), which is mounted on a base plate (5). A boiler outer shell (1) is fitted and welded to the outer side of the boiler inner liner (2) and the base plate (5). A water cavity for holding water is formed between the boiler outer shell (1), the boiler inner liner (2), and the base plate (5). An inlet (20), an outlet (21), and a drain valve (22) connecting the water cavity are installed on the boiler outer shell (1). The boiler inner liner (2) includes a combustion chamber (3) and multiple heat sources (4). Adjacent heat sources (4) are connected by a horizontal pipe (12) to form a serpentine channel structure. The combustion chamber (3) is connected to the serpentine channel by a connecting pipe (11). Multiple heat source pipes (13) connecting the water cavity are inserted through the heat source (4). An air inlet (19) is connected to one side of the combustion chamber (3). The furnace is connected from top to bottom by a reverse-firing furnace door (8), a forward-firing furnace door (9), and an ash-removing door (10). The combustion chamber (3) between the reverse-firing furnace door (8) and the forward-firing furnace door (9), and between the forward-firing furnace door (9) and the ash-removing door (10) are respectively connected by an upper furnace branch pipe (6) and a lower furnace branch pipe (7) that connect to the water chamber. The reverse-firing furnace door (8), the forward-firing furnace door (9), the ash-removing door (10), and the air inlet (19) are all connected to the combustion chamber. (3) inside and outside of boiler shell (1), and boiler inspection door (14) is installed at the connection between boiler shell (1) and reverse combustion furnace door (8), forward combustion furnace door (9), ash cleaning door (10) and air inlet (19). An external pipe (15) is inserted and welded on the boiler shell (1). One end of the external pipe (15) is connected to a serpentine channel, and the other end of the external pipe (15) is connected to the air inlet of induced draft fan (16).

2. The boiler waste heat utilization device according to claim 1, characterized in that: The number of upper furnace branch pipes (6) and lower furnace branch pipes (7) are both multiple and arranged horizontally in a single row. The distance between adjacent upper furnace branch pipes (6) is not less than the distance between adjacent lower furnace branch pipes (7).

3. The boiler waste heat utilization device according to claim 1, characterized in that: The air inlet (19) is located on the side of the combustion chamber (3) facing away from the connecting pipe (11).

4. The boiler waste heat utilization device according to claim 1, characterized in that: The heat source tube (13) is horizontally installed on the heat source (4).

5. A boiler waste heat utilization device according to claim 1, characterized in that: The heat source tubes (13) that are adjacent to each other are arranged alternately from left to right.

6. A boiler waste heat utilization device according to claim 1, characterized in that: The exhaust port of the induced draft fan (16) is connected to the side of the chimney (17), and the axis of the chimney (17) is perpendicular to the bottom surface of the base plate (5).

7. A boiler waste heat utilization device according to claim 1, characterized in that: The bottom side of the heat source (4) is connected to a dust removal door (10).

8. A boiler waste heat utilization device according to claim 1, characterized in that: Blind plates (18) are installed at one end of the external pipe (15) located outside the boiler shell (1) and at the bottom of the chimney (17).

9. A boiler waste heat utilization device according to claim 1, characterized in that: The water inlet (20) is located at the bottom of the side of the boiler shell (1) on the side of the combustion chamber (3), and the water outlet (21) is located at the top of the side of the boiler shell (1) away from the combustion chamber (3).

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