CN211475987U - Structure of uniform flow field of waste heat utilization boiler flue - Google Patents
Structure of uniform flow field of waste heat utilization boiler flue Download PDFInfo
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- CN211475987U CN211475987U CN201922241532.5U CN201922241532U CN211475987U CN 211475987 U CN211475987 U CN 211475987U CN 201922241532 U CN201922241532 U CN 201922241532U CN 211475987 U CN211475987 U CN 211475987U
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Abstract
The utility model relates to a structure of a uniform flow field of a waste heat utilization boiler flue, which comprises a first flow guide structure (5), a second flow guide structure (6) and a third flow guide structure (7); the first flow guide structure (5) is located on the right side of an outlet of the first flue (1), the second flow guide structure (6) is located on the right side of an outlet of the second flue (2), and the third flow guide structure (7) is located on the right side of the third flue (3) and is close to the fourth flue(4) An entry location; the first diversion structure (5), the second diversion structure (6) and the third diversion structure (7) are all in the shape of two folded plates formed by overlaying anti-corrosion materials; an included angle theta is formed between the two folded plates1、θ2And theta3Angle of inclination theta1、θ2And theta3Is not less than 60. The utility model is suitable for waste incineration or pyrolysis gasification-combustion waste heat utilization boiler flue, and is beneficial to the waste heat utilization of flue gas and the corrosion prevention of equipment such as heat exchangers.
Description
Technical Field
The patent of the utility model relates to a waste heat treatment waste heat utilization electricity generation field particularly relates to a structure that is used for waste incineration or pyrolysis gasification-burning waste heat utilization boiler flue even flow field.
Background
Along with the development of urbanization, the production of domestic garbage in cities and rural areas is increasing day by day, and the domestic garbage treatment mode in China is in transition from the conventional landfill as the main mode to garbage combustion/pyrolysis gasification treatment. According to the plan of the state thirteen five, the incineration pyrolysis treatment capability of the domestic garbage in urban villages and towns accounts for more than 50% of the total harmless treatment capability by the end of 2020, wherein the eastern area reaches more than 60%.
The shapes of the second flue and the third flue with rectangular cross sections commonly adopted by the conventional waste heat utilization boiler cause the flue gas in the second flue and the third flue to have uneven temperature distribution, uneven speed distribution and uneven concentration of substances such as fly ash. The unevenness of the temperature field, the speed field and the concentration field brings the following problems to the utilization of the flue gas waste heat in the fourth flue and the corrosion resistance of the equipment:
1. because the initial temperature field is not uniformly distributed, the heat exchange surfaces of the evaporator, the superheater and the economizer are not fully utilized, and the expected economic effect cannot be achieved.
2. The high-temperature flue gas causes the heat exchanger to generate high-temperature corrosion, and the serious accident of forced shutdown of the heat exchanger caused by pipe explosion can affect the operation of the waste incineration power plant.
3. The flow field and the concentration field are unevenly distributed, so that the phenomena of local abrasion and ash blockage of equipment are easily caused, and the reliability and the economical efficiency of the equipment are seriously influenced.
If the structural design of the uniform flow field of the waste incineration or pyrolysis-combustion exhaust-heat boiler flue with the diversion structure is adopted, the temperature field, the speed field and the concentration field in the uniform flue improve the power generation efficiency of the whole plant and increase the economic benefit of a power plant while ensuring the stability and the safety of a power generation system, and the problem to be solved in the prior art is solved urgently.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the technical problem and providing a flue structural design with more uniform flow field, temperature field and concentration field in the flue of the waste incineration or pyrolysis gasification-combustion waste heat utilization boiler.
The utility model discloses a concrete technical scheme is: a structure of a uniform flow field of a waste heat utilization boiler flue comprises a first flow guide structure 5, a second flow guide structure 6 and a third flow guide structure 7; the first flow guide structure 5 is positioned at the right side of the outlet of the first flue 1, the second flow guide structure 6 is positioned at the right side of the outlet of the second flue 2, and the third flow guide structure 7 is positioned at the right side of the third flue 3 and close to the inlet of the fourth flue 4;
the first diversion structure 5, the second diversion structure 6 and the third diversion structure 7 are all in the shape of two folded plates formed by overlaying anti-corrosion materials; an included angle theta is formed between the two folded plates1、θ2And theta3Angle of inclination theta1、θ2And theta3Is not less than 60.
Further, the folded plates form an included angle theta1、θ2And theta3The range is 60-120 deg.
Further, the folded plates form an included angle theta1、θ2And theta3The range is 60 to 90 degrees.
Furthermore, the guide structure is prevented from being corroded by high-temperature and high-corrosivity smoke, and the guide structure adopts an anti-corrosion material surfacing technology. The utility model provides a novel structural design of flue even flow field makes temperature field, speed field and the concentration field evenly distributed of flue gas in the fourth flue 4, the waste heat utilization of favourable flue gas, the anticorrosion of equipment such as heat exchanger, the utility model is suitable for a waste incineration or pyrolysis gasification-burning waste heat utilization boiler flue arrange.
The utility model relates to a novel msw incineration or pyrolysis gasification-burning waste heat utilization boiler flue uniform flow field's structural design, the advantage has:
(1) the flue gas in the second flue and the third flue is uniformly distributed on the temperature field, the speed field and the concentration field, so that the waste heat utilization of the flue gas is facilitated.
(2) By adopting the anti-corrosion material surfacing technology, the diversion structure can be effectively protected under the scouring of high-temperature flue gas.
(3) Compare in the inside guide plate of installing additional of flue, more economy, implement easily, and also longer in the inside guide plate life of flue.
Drawings
Fig. 1 is a schematic structural view of the uniform flow field of the flue of the waste heat utilization boiler.
FIG. 2 shows the angle θ of the flow guiding structure1、θ2And theta3Schematic representation.
In the embodiment 2 of fig. 3, the flow field simulation diagram of the structure flow guiding flow channel of the uniform flow field of the flue of the waste heat utilization boiler is adopted.
In the figure: the flue comprises a first flue 1, a second flue 2, a third flue 3, a fourth flue 4, a first flow guide structure 5, a second flow guide structure 6 and a third flow guide structure 7.
Detailed Description
Examples 1 to 4: steam parameter is 4MPaThe waste heat utilization boiler at 400 ℃ is taken as an example to illustrate the specific implementation mode of the utility model. As shown in fig. 1, it is a schematic structural diagram of the uniform flow field of the flue of the waste heat utilization boiler of the present invention. In the power generation waste heat boiler system utilizing waste heat generated by waste incineration or pyrolysis gasification-combustion, flue gas enters the second flue 2 from the first flue 1, is rectified by the first flow guide structure 5 in the second flue 2, enters the third flue 3 through the second flow guide structure 6 at the outlet of the second flue 2, is rectified by the third flow guide structure 7, enters the fourth flue 4, and is subjected to waste heat recovery and utilization in the fourth flue 4. The first flow guiding structure 5 is positioned in the middle of the right side of the second flue 2, and theta1And more than 60 degrees, and the structure performs primary rectification on the flue gas at the inlet of the second flue 2. The second flow guide structure 6 is positioned at the outlet of the second flue 2, and theta2>And 60 degrees, and the flue gas entering the third flue 3 is rectified for the second time. The third flow guide structure 7 is positioned at the right side of the third flue, and theta3>And 60 degrees, and the flue gas entering the fourth flue 4 is rectified for the third time. FIG. 2 shows the angle θ of the flow guiding structure1、θ2And theta3Schematic representation. In the figure, the included angle theta of the flow guide structure1、θ2And theta3Not less than 60 degrees, otherwise can be behind the water conservancy diversion structure, produce the vortex, influence the heat transfer, increase the wear of water conservancy diversion structure simultaneously. As shown in table 1, simulation results of different embodiments show that the flow velocity distribution of flue gas entering the fourth flue 4 after being guided by the guide structure is more uniform, and in embodiments 2 to 4, the standard deviation of the velocity of flue gas at the inlet of the fourth flue 4 is obviously smaller than that of embodiment 1 (i.e., a comparison example) without the guide structure, wherein the smaller the standard deviation of the velocity is, the more uniform the flow field is. The flue flow field distribution of example 2 is shown in figure 3. The utility model discloses the structure water conservancy diversion runner flow field analog diagram of the even flow field of waste heat utilization boiler flue.
Table 1 example data analysis
Claims (3)
1. A structure of a uniform flow field of a waste heat utilization boiler flue is characterized by comprising a first flow guide structure (5), a second flow guide structure (6) and a third flow guide structure (7); the first flow guide structure (5) is positioned on the right side of the outlet of the first flue (1), the second flow guide structure (6) is positioned on the right side of the outlet of the second flue (2), and the third flow guide structure (7) is positioned on the right side of the third flue (3) and close to the inlet of the fourth flue (4);
the first diversion structure (5), the second diversion structure (6) and the third diversion structure (7) are all in the shape of two folded plates formed by overlaying anti-corrosion materials; an included angle theta is formed between the two folded plates1、θ2And theta3Angle of inclination theta1、θ2And theta3Is not less than 60.
2. The structure of the uniform flow field of the flue of the waste heat utilization boiler as claimed in claim 1, wherein an included angle θ is formed between the folding plates1、θ2And theta3The range is 60-120 deg.
3. The structure of the uniform flow field of the flue of the waste heat utilization boiler as claimed in claim 1, wherein an included angle θ is formed between the folding plates1、θ2And theta3The range is 60 to 90 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922241532.5U CN211475987U (en) | 2019-12-15 | 2019-12-15 | Structure of uniform flow field of waste heat utilization boiler flue |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922241532.5U CN211475987U (en) | 2019-12-15 | 2019-12-15 | Structure of uniform flow field of waste heat utilization boiler flue |
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| Publication Number | Publication Date |
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| CN211475987U true CN211475987U (en) | 2020-09-11 |
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| CN201922241532.5U Active CN211475987U (en) | 2019-12-15 | 2019-12-15 | Structure of uniform flow field of waste heat utilization boiler flue |
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