Waste heat boiler with upward inclined outlet flue

Abstract

The waste heat boiler comprises a boiler body, one end of the boiler body is connected with an uptake flue, the uptake flue is connected with an outlet of a bottom blowing furnace, the boiler body is sequentially provided with a radiation heat exchange chamber and a convection heat exchange chamber, the radiation heat exchange chamber is close to the uptake flue, and the convection heat exchange chamber is close to the uptake flue. The other end of the boiler body is provided with an outlet flue, the outlet flue is obliquely arranged upwards, a baffle is further arranged in the radiation heat exchange chamber, and a rapping assembly is arranged on one side of the baffle. The flue gas channel is divided into a plurality of heat exchange sections with different functions, and a corresponding heat exchange component is arranged in each section, so that stepped waste heat recovery of flue gas is realized, the overall heat recovery efficiency is remarkably improved, and energy waste is avoided.

Description

Technical Field

[0001] This utility model belongs to the field of waste heat boiler technology, specifically relating to a waste heat boiler with an upwardly inclined outlet flue. Background Technology

[0002] Waste heat boilers, as core equipment for high-grade waste heat recovery, play a crucial role in energy efficiency and process integration in industries such as metallurgy. Their operating status directly affects the stability and economy of the production system; therefore, safe, stable, and efficient operation are the core requirements for waste heat boilers. In actual production, waste heat boilers experience abnormal boiler body vibration. Continuous operation may lead to boiler structural fatigue, auxiliary equipment damage, or even unplanned shutdowns, threatening overall production safety.

[0003] To address the above problems, this utility model proposes a waste heat boiler with an upwardly inclined outlet flue, which can not only make full use of the waste heat of the flue gas, but also optimize the flow of flue gas inside the waste heat boiler, thereby reducing boiler vibration and extending equipment life. Utility Model Content

[0004] This invention provides a waste heat boiler with an upwardly inclined outlet flue to solve the problems existing in the background art.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0006] A waste heat boiler with an upwardly inclined outlet flue includes a boiler body. One end of the boiler body is connected to a rising flue, which is connected to the outlet of a bottom-blown furnace. The boiler body is sequentially provided with a radiant heat exchange chamber and a convection heat exchange chamber. The radiant heat exchange chamber is close to the rising flue. The other end of the boiler body is provided with an outlet flue, which is inclined upward. A baffle is also provided in the radiant heat exchange chamber, and a rapping assembly is provided on one side of the baffle.

[0007] Preferably, the rapping assembly includes a rapping motor fixed to one side of the boiler body, a drive shaft fixedly connected to the output end of the rapping motor, the drive shaft passing through the boiler body and rotatably connected to it, and an eccentric block fixedly connected to the middle position of the drive shaft, the eccentric block contacting one side of the baffle when rotating.

[0008] Preferably, the baffle is connected to the inner wall of the radiant heat exchange chamber via a connecting plate, which is an elastic metal plate.

[0009] Preferably, an ash hopper is installed below the baffle, and the ash hopper is slidably connected to the bottom of the radiant heat exchange chamber via a slot.

[0010] Preferably, the convection heat exchange chamber is provided with a convection tube bundle.

[0011] Preferably, the convection tube bundle is provided in 5 groups, the convection tube bundle includes multiple vertical pipes, the multiple vertical pipes are arranged at intervals and connected end to end, and the 5 groups of convection tube bundles are connected by pipes.

[0012] Preferably, a slag-condensing tube screen is provided inside the boiler body between the baffle and the convection tube bundle.

[0013] Preferably, baffles are provided at intervals below the slag-coagulating tube screen and the convection tube bundle. The baffles are located in front of and below the slag-coagulating tube screen, and in the lower middle of the first and second groups of convection tube bundles from left to right, and in the lower middle of the third and fourth groups of convection tube bundles.

[0014] Preferably, the outlet flue is located at the top of the boiler body and tilted upward at an angle of 60°-65°.

[0015] Preferably, both the rising flue and the radiant heat exchange chamber adopt a membrane water-cooled wall structure.

[0016] This utility model has the following beneficial effects:

[0017] (1) This utility model divides the flue gas passage into multiple heat exchange sections with different functions and sets up corresponding heat exchange components in each section to realize the step-by-step recovery of waste heat from the flue gas; the radiant heat exchange chamber uses radiant heat exchange to quickly absorb heat from the flue gas, while the convection heat exchange chamber further absorbs waste heat from the flue gas through convection, so that the overall thermal efficiency of the boiler is significantly improved; through this modular design, heat from different temperature zones is absorbed efficiently in sequence, so that the flue gas temperature drops in a step-by-step manner, thereby significantly improving the overall heat recovery efficiency and avoiding energy waste.

[0018] (2) The present invention adopts an upward inclined flue gas outlet design. The inclined structure has a dual function: first, to eliminate outlet eddies and ensure flow stability; second, to effectively suppress boiler surge and avoid the risk of flue gas backflow.

[0019] (3) The baffles and rapping components installed in the radiant heat exchange chamber effectively prevent the dust in the flue gas from accumulating on the baffles, reducing the risk of thermal efficiency reduction and equipment blockage caused by dust accumulation; the rapping components periodically rap the baffles to make the dust fall into the ash hopper below, and the ash hopper is slidably connected to the bottom of the radiant heat exchange chamber for regular cleaning of the dust. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the internal structure of this utility model;

[0022] Figure 3This is a schematic diagram of the slag-coagulating tube screen and convection tube bundle structure of this utility model;

[0023] In the diagram, 1-boiler body, 2-rising flue, 3-radiant heat exchange chamber, 4-convective heat exchange chamber, 5-outlet flue, 6-baffle, 7-vibrating motor, 8-drive shaft, 9-eccentric block, 10-connecting plate, 11-ash hopper, 12-slot, 13-convective tube bundle, 14-vertical pipe, 15-slag condensation tube screen, 16-baffle wall. Detailed Implementation

[0024] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding of this utility model, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0025] A waste heat boiler with an upwardly inclined outlet flue, as shown in the attached... Figure 1-3 As shown, the boiler includes a boiler body 1, one end of which is connected to a rising flue 2, which is connected to the outlet of a bottom-blown furnace. The boiler body 1 is sequentially provided with a radiant heat exchange chamber 3 and a convection heat exchange chamber 4. The radiant heat exchange chamber 3 is close to the rising flue 2. The other end of the boiler body 1 is provided with an outlet flue 5, which is inclined upwards and located at the top of the boiler body 1 at an upward inclination angle of 60°-65°. A baffle 6 is also provided inside the radiant heat exchange chamber 3, and a rapping assembly is provided on one side of the baffle 6. Both the rising flue 2 and the radiant heat exchange chamber 3 adopt a membrane water-cooled wall structure (not shown in the figure, the rest is the same). After the high-temperature flue gas exits the bottom-blown furnace, it enters the boiler and passes through the rising flue 2, the radiant heat exchange chamber 3 and the convection heat exchange chamber 4 in sequence, so that the flue gas temperature drops to different temperature ranges respectively, and finally it is smoothly discharged from the boiler outlet flue 5.

[0026] The rapping assembly includes a rapping motor 7 fixed to one side of the boiler body 1. A drive shaft 8 is fixedly connected to the output end of the rapping motor 7. The drive shaft 8 passes through the boiler body 1 and is rotatably connected to it. An eccentric block 9 is fixedly connected to the middle position of the drive shaft 8. When rotating, the eccentric block 9 contacts one side of the baffle 6. The baffle 6 is connected to the inner wall of the radiant heat exchange chamber 3 through a connecting plate 10 made of elastic metal plate. When the rapping motor 7 is working, the eccentric block 9 contacts one side of the baffle 6 during rotation, producing a rapping effect and preventing dust accumulation on the baffle 6. An ash hopper 11 is installed below the baffle 6 to collect dust. The ash hopper 11 is slidably connected to the bottom of the radiant heat exchange chamber 3 through a slot 12, which facilitates the cleaning of the dust collected in the ash hopper 11.

[0027] Specifically, the convection heat exchange chamber 4 is provided with convection tube bundles 13; in this embodiment, there are a total of 5 sets of convection tube bundles 13, each set including multiple vertical pipes 14, which are spaced apart and connected end to end. The 5 sets of convection tube bundles 13 are connected by pipes. After the flue gas passes through the multiple sets of convection tube bundles 13, the flue gas velocity decreases, effectively prolonging the residence time of the flue gas in the convection heat exchange chamber 4 and improving the overall heat recovery rate of the flue gas.

[0028] Furthermore, in order to further settle the flue gas, a slag-collecting tube screen 15 is provided inside the boiler body 1 between the baffle 6 and the convection tube bundle 13 (the slag-collecting tube has the same structure as the convection tube bundle, and will not be described in detail here).

[0029] Baffles 16 are provided at intervals below the slag condensation tube screen 15 and the convection tube bundle 13. The baffles 16 are located in front of and below the slag condensation tube screen 15, and in the lower middle of the first and second groups of convection tube bundles 13 from left to right, and in the lower middle of the third and fourth groups of convection tube bundles 13. This arrangement can prevent the flue gas from passing directly under the slag condensation tube screen and the convection tube bundle 13 without heat exchange, thereby affecting the overall heat recovery rate of the flue gas.

[0030] Work process

[0031] High-temperature flue gas from the bottom-blown furnace enters the radiant heat exchange chamber 3 through the rising flue duct 2. The concentrated flow of flue gas encounters baffle 6 and, upon impact, forms a controllable backflow, effectively increasing the contact between the flue gas and the water-cooled wall tubes. Simultaneously, the high-temperature flue gas also radiates heat to the surrounding water-cooled walls. Under the combined action of the above-mentioned composite heat exchange methods, the flue gas temperature rapidly decreases in the area of ​​baffle 6, causing the molten dust mixed in the flue gas to solidify. The solidified dust particles are less prone to adhesion due to their reduced surface energy. Therefore, the dust deposited on the surface of baffle 6 can be automatically detached by the rapping assembly and collected in the ash hopper 11, ensuring the cleanliness of the heat exchange surface and maintaining heat exchange efficiency. The flue gas, after initial cooling, is blocked... Plate 6 divides the flue gas into several small streams that fill the cavity of the radiant heat exchange chamber 3, allowing for sufficient heat exchange with the water-cooled wall. The flue gas, passing through the gaps in baffle 6 and meandering under baffle 6, enters the convection heat exchange chamber 4. After passing through the slag-collecting tube screen 15, the flue gas dust is further settled, and then it undergoes convective heat exchange with the convection tube bundle 13. The presence of 5 sets of convection tube bundles 13 reduces the flue gas velocity, effectively prolonging the residence time of the flue gas in the convection heat exchange chamber 4 and improving the overall heat recovery rate of the flue gas. Finally, the flue gas flows out from the inclined upward outlet flue duct 5. This inclined structure has a dual function: first, to eliminate outlet eddies and ensure flow stability; and second, to effectively suppress boiler surge and avoid the risk of flue gas backflow.

Claims

1. A waste heat boiler having an upwardly inclined outlet flue, characterized in that, The boiler includes a boiler body (1), one end of which is connected to a rising flue (2), which is connected to the bottom blower outlet. The boiler body (1) is provided with a radiant heat exchange chamber (3) and a convection heat exchange chamber (4) in sequence. The radiant heat exchange chamber (3) is close to the rising flue (2). The other end of the boiler body (1) is provided with an outlet flue (5), which is inclined upward. A baffle (6) is also provided in the radiant heat exchange chamber (3), and a vibrating assembly is provided on one side of the baffle (6).

2. The waste heat boiler with upwardly inclined outlet flue according to claim 1, characterized in that, The rapping assembly includes a rapping motor (7) fixed to one side of the boiler body (1). The output end of the rapping motor (7) is fixedly connected to a transmission shaft (8). The transmission shaft (8) passes through the boiler body (1) and is rotatably connected to it. An eccentric block (9) is fixedly connected to the middle position of the transmission shaft (8). The eccentric block (9) contacts one side of the baffle (6) when rotating.

3. The waste heat boiler with upwardly inclined outlet flue according to claim 1, characterized in that, The baffle (6) is connected to the inner wall of the radiant heat exchange chamber (3) via a connecting plate (10), which is an elastic metal plate.

4. The waste heat boiler having an upwardly inclined outlet flue according to claim 1, characterized in that, A hopper (11) is installed below the baffle (6), and the hopper (11) is slidably connected to the bottom of the radiant heat exchange chamber (3) through a slot (12).

5. The waste heat boiler with upwardly inclined outlet flue according to claim 1, characterized in that, The convection heat exchange chamber (4) is equipped with a convection tube bundle (13).

6. The waste heat boiler having an upwardly inclined outlet flue according to claim 1, characterized in that, Five sets of convection tube bundles (13) are provided. Each convection tube bundle (13) includes multiple vertical pipes (14). The multiple vertical pipes (14) are spaced apart and connected end to end. The five sets of convection tube bundles (13) are connected by pipes.

7. The waste heat boiler having upwardly inclined outlet flue according to claim 1, characterized in that, A slag-condensing tube screen (15) is provided inside the boiler body (1) between the baffle (6) and the convection tube bundle (13).

8. The waste heat boiler having upwardly inclined outlet flue according to claim 1, characterized in that, A baffle wall (16) is provided at intervals below the slag tube screen (15) and the convection tube bundle (13). The baffle wall (16) is located in front of and below the slag tube screen (15), and in the lower middle of the first and second groups of convection tube bundles (13) from left to right, and in the lower middle of the third and fourth groups of convection tube bundles (13).

9. The waste heat boiler having upwardly inclined outlet flue according to claim 1, characterized in that, The outlet flue (5) is located at the top of the boiler body (1) and is inclined upward at an angle of 60°-65°.

10. The waste heat boiler having an upwardly inclined outlet flue according to claim 1, characterized in that, Both the rising flue (2) and the radiant heat exchange chamber (3) adopt membrane water-cooled wall structures.

Images