High-temperature bypass flue gas evaporation device for concentrated water treatment of thermal power plant

Abstract

The utility model discloses a high-temperature bypass flue gas evaporation device for concentrated water treatment of a thermal power plant. The high-temperature bypass flue gas evaporation device comprises an evaporator shell, a flue gas guide assembly and a plurality of nozzles, the flue gas guide assembly is arranged on the inner side of the top of the evaporator shell and comprises a flue gas inlet pipe, a flue gas guide shell and guide fins, the flue gas guide shell is in a dome shape, and a gap is formed between the flue gas guide shell and the inner wall of the evaporator shell; the nozzle is a double-fluid nozzle. According to the flow guide structure, part of flue gas can be guided to flow downwards along the inner wall of the evaporator, a certain shielding effect can be achieved on water drops sputtered on the inner wall, the water drops sputtered on the inner wall can be rapidly dried, and the corrosion of the water drops is reduced; in addition, on the spray head, the double-fluid spray head is adopted, the washing pipeline is arranged, abrasive particles can be conveyed to the spray head through the washing pipeline at regular intervals, the blocking cover is arranged on the outer side of the double-fluid spray head, the spraying range can be effectively limited, and sputtering towards the inner wall is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of evaporative concentrated wastewater, in particular to a high-temperature bypass flue gas evaporation device for concentrated water treatment in a thermal power plant. Background Art

[0002] With the increasingly stringent requirements of environmental protection policies and regulations, the terminal wastewater discharge of thermal power plants has become increasingly strict. The amount of desulfurization wastewater accounts for 80% of the terminal wastewater. Evaporation and concentration is currently a commonly used reduction process. Bypass flue evaporation refers to setting up a flue bypass in parallel with the air preheater, leading part of the high-temperature flue gas at the inlet of the air preheater into the wastewater evaporator installed in the bypass (i.e., bypass flue), using an atomizing nozzle to spray the desulfurization wastewater into the evaporator, and using the waste heat of the high-temperature flue gas to evaporate the water. There are currently the following problems in the spray evaporation process: During the spraying process, the wastewater will be sprayed on the inner wall of the evaporator. Since the desulfurization wastewater is corrosive to a certain extent, long-term use will cause certain corrosion to the inner wall; in addition, the desulfurization wastewater has poor water quality and the atomizing nozzle is easily blocked by scale. Utility Model Content

[0003] The utility model aims to provide a high-temperature bypass flue gas evaporation device for concentrated water treatment in a thermal power plant to solve the problems existing in the prior art.

[0004] In order to achieve the above-mentioned purpose, the technical solution of the utility model provides a high-temperature bypass flue gas evaporation device for concentrated water treatment in a thermal power plant, including an evaporator shell, a flue gas guide assembly, and a plurality of nozzles; the top of the evaporator shell is dome-shaped, and a smoke inlet is arranged in the center of the top; the flue gas guide assembly is arranged on the inner side of the top of the evaporator shell, including a smoke inlet pipe, a smoke guide shell, and guide fins; the smoke inlet pipe is arranged in the smoke inlet and is fixed to the inner wall of the smoke inlet by a plurality of guide fins; the smoke guide shell is dome-shaped, and the center of the top is connected to the smoke inlet pipe; a gap is arranged between the smoke guide shell and the inner wall of the evaporator shell; a plurality of nozzle arrays are arranged in the smoke guide shell.

[0005] Furthermore, the inner diameter of the smoke inlet pipe is 70%-90% of the inner diameter of the smoke inlet port, and the guide fins are provided with an inclination angle with the plumb plane and are arranged in an array outside the smoke inlet pipe.

[0006] Furthermore, the nozzle is a dual-fluid nozzle, and the nozzle includes a base and an upper cover. The base is in the shape of a stepped shaft, including a thick part and a thin part, and a stepped hole is arranged in the base; the upper cover is arranged on the outside of the thin part, and a gap is arranged with the outer wall of the thin part, and an air inlet is arranged on the side of the upper cover; a through hole is arranged on the top of the upper cover, the top of the thin part extends out of the through hole of the upper cover, and the top of the thin part is provided with a smooth chamfer.

[0007] Furthermore, a plurality of water-guiding fins are arranged in the stepped hole on the side with the larger inner diameter. The water-guiding fins are arranged on the inner wall of the stepped hole, and the coaxial surface is arranged with an inclination.

[0008] Furthermore, an abrasive hole connected with the stepped hole is arranged on the side of the thick portion, and the abrasive hole is located in the water guide fin area or in the area between the water guide fin and the thin portion.

[0009] Furthermore, a threaded fixing ring is provided at the bottom of the detail, and a thread is provided at the bottom of the upper cover, and fixation is achieved through threaded connection with the threaded fixing ring.

[0010] Furthermore, a plurality of air guide fins are arranged on the top of the upper cover, and the coaxial surfaces of the air guide fins are arranged to be inclined.

[0011] Furthermore, a trumpet-shaped blocking cover is provided on the top of the upper cover.

[0012] A guide structure is arranged at the smoke inlet of the evaporator device of the utility model, which can guide part of the smoke to flow downward along the inner wall of the evaporator, and can have a certain barrier effect on the water droplets splashed onto the inner wall, and can also quickly dry the water droplets splashed onto the inner wall to reduce their corrosiveness; on the nozzle, the present application adopts a dual-fluid nozzle and is provided with a flushing pipe, and abrasive particles can be regularly transported to the nozzle through the flushing pipe, and a blocking cover is arranged on the outside of the dual-fluid nozzle, which can effectively limit the range of the spray and reduce the splashing to the inner wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a top cutaway schematic diagram of the evaporation device of the utility model.

[0014] Figure 2 It is an enlarged schematic diagram of the smoke inlet area of ​​the utility model.

[0015] Figure 3 It is a schematic diagram of the nozzle of the utility model.

[0016] Figure 4 It is a schematic cross-sectional view of the nozzle of the utility model.

[0017] Figure 5 It is a schematic diagram of the nozzle line diagram of the utility model.

[0018] Figure 6 This is a schematic diagram of the nozzle of another embodiment of the utility model DETAILED DESCRIPTION

[0019] 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.

[0020] As attached Figure 1 As shown, a high-temperature bypass flue gas evaporation device for concentrated water treatment in a thermal power plant according to the utility model comprises an evaporator shell 1 , a flue gas guide component 2 , and a plurality of nozzles 3 .

[0021] As attached Figure 1 , 2 As shown, the top of the evaporator shell 1 is dome-shaped, and the smoke flows in from the smoke inlet 11 located in the center of the top. The smoke guide component 2 is arranged on the inner side of the top of the evaporator shell 1, including a smoke inlet pipe 21 and a smoke guide shell 22. The smoke inlet pipe 21 is arranged in the smoke inlet 11 and is fixed to the inner wall of the smoke inlet 11 by a plurality of guide fins 23. The inner diameter of the smoke inlet pipe 21 is 70%-90% of the inner diameter of the smoke inlet 11. The guide fins 23 are provided with an inclination angle with the plumb plane and are arranged in an array outside the smoke inlet pipe 21, which has a guiding effect on the smoke passing through the smoke inlet pipe 21 and the smoke inlet 11, forming a spiral airflow.

[0022] The smoke guide shell 22 is dome-shaped, and the center of the top is connected to the smoke inlet pipe 21 . A gap is provided between the smoke guide shell 22 and the inner wall of the evaporator shell 1 .

[0023] After the smoke flows in through the smoke inlet 11, it is split into two streams at the smoke inlet pipe 21. One stream flows into the smoke guide shell 22 through the smoke inlet pipe 21 and then diffuses into the evaporator shell 1. The other stream enters the gap between the smoke inlet pipe 21, the smoke guide shell 22 and the evaporator shell 1, forming a spiral airflow close to the inner wall of the evaporator shell 1.

[0024] The nozzle 3 is arranged in the smoke guide housing 22, and a plurality of nozzles 3 are arranged in an array in the smoke guide housing 22. Figure 3 , 4 As shown in , 5, the nozzle 3 is a dual-fluid nozzle. The nozzle 3 is connected to the outside through a pipeline, including a water inlet pipe and an air inlet pipe. The specific connection structure of the water inlet pipe and the air inlet pipe is conventional knowledge in the field.

[0025] The nozzle 3 includes a base 31 and an upper cover 32. The base 31 is in a stepped shaft shape, with one side having a larger diameter as a thick portion a and the other side having a smaller diameter as a thin portion b. A stepped hole 311 is provided in the base 31, wherein the stepped hole has a larger diameter in a region with a larger diameter of the base 31 and has a smaller diameter in a region with a smaller diameter of the base 31. The stepped hole 311 in the thick portion a is connected to the water inlet pipe.

[0026] A plurality of water-guiding fins 312 are arranged in the stepped hole 311 on the side with a larger inner diameter. The water-guiding fins 312 are arranged on the inner wall of the stepped hole 311 , and the coaxial surface is inclined so that a vortex is formed when water flows through.

[0027] An abrasive hole 313 communicating with the stepped hole 311 is disposed on the side of the thick portion a. The abrasive hole 313 is located in the area of ​​the water guide fin 312 or in the area between the water guide fin 312 and the thin portion b.

[0028] The abrasive hole 313 is connected to the abrasive pump and the abrasive bin through a pipeline. The abrasive is a mixture of fine abrasive and water. The fine abrasive can be corundum. The abrasive pump is closed when the nozzle is in normal use. When maintenance is required, the abrasive pump is turned on to pump the abrasive through the abrasive hole 313. The nozzle is "water-polished" under the action of water flow, which can reduce downtime maintenance to a large extent. The specific abrasive particle size and grinding time need to be determined in combination with water quality and nozzle material experiments.

[0029] The upper cover 32 is arranged outside the detail b, and a gap is arranged with the outer wall of the detail b. Specifically, a threaded fixing ring b1 is arranged at the bottom of the detail b, and a thread is arranged at the bottom of the upper cover 32, and fixation is achieved by threaded connection with the threaded fixing ring b1.

[0030] The top of the upper cover 32 is provided with a through hole, the top of the detail b extends out of the through hole of the upper cover, and the top of the detail b is provided with a smooth chamfer.

[0031] A plurality of air guide fins 321 are arranged on the top of the upper cover 32. The coaxial surface of the air guide fins 321 is inclined. When the air flows through, a vortex is formed. Moreover, under the wall effect, the air flows along the smooth chamfered side surface of the top of the detail b and collides with the water flow sprayed from the stepped hole 311 to form water mist.

[0032] An air inlet 322 is provided on the side of the upper cover 32 and is communicated with the air inlet pipe.

[0033] As attached Figure 6 As shown, a trumpet-shaped blocking cover 33 is also provided on the top of the upper cover 32, which can effectively limit the range of the spray and reduce the splashing to the inner wall.

[0034] It should be noted that, unless otherwise clearly specified and limited, the terms such as "install", "connect", "connect", "fix", "set" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

Claims

1. A high-temperature bypass flue gas evaporation device for concentrated water treatment in a thermal power plant, characterized in that: It includes an evaporator shell, a smoke guide component, and a plurality of nozzles; the top of the evaporator shell is dome-shaped, and a smoke inlet is arranged in the center of the top; the smoke guide component is arranged on the inner side of the top of the evaporator shell, and includes a smoke inlet pipe, a smoke guide shell, and guide fins; the smoke inlet pipe is arranged in the smoke inlet and fixed to the inner wall of the smoke inlet through a plurality of guide fins; the smoke guide shell is dome-shaped, and the center of the top is connected to the smoke inlet pipe; a gap is arranged between the smoke guide shell and the inner wall of the evaporator shell; a plurality of nozzle arrays are arranged in the smoke guide shell.

2. The high-temperature bypass flue gas evaporation device for concentrated water treatment in a thermal power plant according to claim 1, characterized in that: The inner diameter of the smoke inlet pipe is 70%-90% of the inner diameter of the smoke inlet port, and the guide fins are arranged at an inclination angle with the plumb plane and are arranged in an array outside the smoke inlet pipe.

3. The high-temperature bypass flue gas evaporation device for concentrated water treatment in a thermal power plant according to claim 1, characterized in that: The nozzle is a dual-fluid nozzle, and the nozzle includes a base and an upper cover. The base is in the shape of a stepped shaft, including a thick part and a thin part, and a stepped hole is arranged in the base; the upper cover is arranged on the outside of the thin part, and a gap is arranged with the outer wall of the thin part, and an air inlet is arranged on the side of the upper cover; a through hole is arranged on the top of the upper cover, the top of the thin part extends out of the through hole of the upper cover, and the top of the thin part is provided with a smooth chamfer.

4. A high-temperature bypass flue gas evaporation device for concentrated water treatment in a thermal power plant according to claim 3, characterized in that: A plurality of water-guiding fins are arranged in the stepped hole on the side with a larger inner diameter. The water-guiding fins are arranged on the inner wall of the stepped hole, and the coaxial surface is arranged with an inclination.

5. A high-temperature bypass flue gas evaporation device for concentrated water treatment in a thermal power plant according to claim 4, characterized in that: An abrasive hole connected with the stepped hole is arranged on the side of the thick part, and the abrasive hole is located in the water guide fin area or the area between the water guide fin and the thin part.

6. A high-temperature bypass flue gas evaporation device for concentrated water treatment in a thermal power plant according to claim 3, characterized in that: A threaded fixing ring is arranged at the bottom of the detail, and a thread is arranged at the bottom of the upper cover, and fixation is achieved through threaded connection with the threaded fixing ring.

7. The high-temperature bypass flue gas evaporation device for concentrated water treatment in a thermal power plant according to claim 3, characterized in that: A plurality of air guide fins are arranged on the top of the upper cover, and the coaxial surfaces of the air guide fins are arranged with an inclination.

8. The high-temperature bypass flue gas evaporation device for concentrated water treatment in a thermal power plant according to claim 3, characterized in that: A trumpet-shaped blocking cover is also arranged on the top of the upper cover.

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