Slurry circulating pump inlet pipeline assembly and flue gas desulfurization equipment
By designing an eccentric reducer pipeline assembly with horizontal upper and lower shrinking toward the center, the cavitation problem of the slurry circulation pump in the flue gas desulfurization system is solved, extending the life of the pump, reducing maintenance costs, and improving operating reliability.
Patent Information
- Application Number
- CN202421535781.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-01
- Publication Date
- 2025-05-13
- Estimated Expiration
- 2034-07-01
AI Technical Summary
In the flue gas desulfurization system, the cavitation phenomenon of the slurry circulation pump is relatively serious, resulting in shortening of the pump's life, noise, vibration and shaft breakage, and the existing technology is difficult to effectively solve these problems.
An eccentric reducer pipe assembly with a horizontal upper part and a center contraction of the lower part is designed to connect the desulfurization absorption tower interface and the slurry circulation pump inlet. Through this pipe assembly, the trapped air can be discharged in time and reduce the risk of cavitation of the pump.
By reducing the air retention time, the cavitation phenomenon of the slurry circulation pump is significantly reduced, the service life of the pump is extended, the maintenance cost and maintenance times are reduced, and the operation reliability of the pump is improved.
Smart Images
Figure CN222855081U_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the technical field of flue gas treatment, and in particular to a slurry circulation pump inlet pipe assembly and a flue gas desulfurization device. Background Art
[0002] Most of the flue gas desulfurization in thermal power plants adopts limestone-gypsum wet desulfurization technology. Its basic principle is that the undesulfurized original flue gas enters the desulfurization absorption tower, and the limestone slurry (desulfurization absorbent) is pumped into the upper middle part of the desulfurization absorption tower by the slurry circulation pump and flows downward. The flue gas contacts the atomized slurry to remove SO2. Usually, the inlet pipe diameter of the slurry circulation pump is smaller than the interface diameter of the desulfurization absorption tower, and a short pipe with a different diameter needs to be designed as a transition section for connection. This short pipe with a different diameter gradually becomes smaller from the interface of the desulfurization absorption tower to the inlet of the slurry circulation pump.
[0003] In the related technology, the pipe wall is equidistantly contracted toward the center, which is called a non-eccentric reducer. Since the limestone slurry contains a certain amount of air, part of the air will be sucked into the slurry pipeline by the slurry circulation pump along with the slurry. Since the air is lighter than the slurry and has upward buoyancy, part of the air will be retained in the upper part of the reducer. Long-term operation under this condition will cause cavitation of the pump. If the pump cavitation occurs, it will affect the life of the pump at the least, and cause serious consequences such as noise, vibration, and broken shaft at the worst. In the desulfurization system, pump cavitation is unavoidable. If you want to slow down the cavitation of the pump, you can only reduce the speed of the pump and improve the anti-cavitation ability of the pump, which will make the pump body larger and increase the investment in equipment. Utility Model Content
[0004] An object of the present disclosure is to provide a slurry circulation pump inlet pipe assembly and a flue gas desulfurization device to at least partially solve the problems existing in the related art.
[0005] In order to achieve the above object, the present disclosure provides a slurry circulation pump inlet pipeline assembly, which is used to connect between a desulfurization absorption tower interface and a slurry circulation pump inlet, wherein the diameter of the desulfurization absorption tower interface is larger than the diameter of the slurry circulation pump inlet, and the slurry circulation pump inlet pipeline assembly comprises:
[0006] A pipeline body is arranged transversely between the desulfurization absorption tower interface and the slurry circulation pump inlet, the diameter of the pipeline body gradually decreases from the desulfurization absorption tower interface to the slurry circulation pump inlet, the top end of the pipeline body is arranged horizontally, and the bottom end of the pipeline body is arranged obliquely;
[0007] A first connecting piece, used to connect the pipeline body and the desulfurization absorption tower interface; and
[0008] The second connecting piece is used to connect the pipeline body and the inlet of the slurry circulation pump.
[0009] Optionally, the inclination angle of the bottom end of the pipe body is 10° to 45°.
[0010] Optionally, the length of the pipe body is 500 mm to 1500 mm.
[0011] Optionally, the diameter of the desulfurization absorption tower interface is 800 mm to 1500 mm, and the diameter of the slurry circulation pump inlet is 500 mm to 800 mm.
[0012] Optionally, the pipe body is made of carbon steel.
[0013] Optionally, the inner wall of the pipe body is provided with a rubber layer.
[0014] Optionally, both the first connecting member and the second connecting member are flanges.
[0015] Optionally, a filter screen is installed at one end of the pipeline body close to the interface of the desulfurization absorption tower.
[0016] According to the second aspect of the present disclosure, a flue gas desulfurization device is also provided, including a desulfurization absorption tower, the desulfurization absorption tower including a desulfurization layer, a spray layer and a smoke exhaust layer arranged in sequence from bottom to top, wherein a smoke inlet is opened on one side of the desulfurization layer, and a desulfurization absorption tower interface is opened on the other side, the spray layer has an atomizing nozzle, and the atomizing nozzle is used to atomize the limestone slurry into the desulfurization layer, the flue gas desulfurization equipment also includes a slurry circulation pump, the slurry circulation pump has a slurry circulation pump inlet and a slurry circulation pump outlet, the slurry circulation pump inlet is connected to the desulfurization absorption tower interface through the above-mentioned slurry circulation pump inlet pipe assembly, the slurry circulation pump outlet is connected to the spray layer, and the smoke exhaust layer has a smoke exhaust port.
[0017] Optionally, a demister is provided in the smoke exhaust layer.
[0018] Through the above technical solution, the eccentric reducer pipe with a horizontal upper part and a lower part contracting toward the center can be used to discharge the trapped air in time, greatly reducing the cavitation of the pump caused by the presence of air. The upper part of the pipe is kept horizontal, so that the air entering with the slurry can be discharged quickly, reducing the time of air retention, preventing the cavitation of the pump caused by air retention, allowing the slurry to fully contact the flue gas, reducing the content of SO2 in the flue gas, being safe and environmentally friendly, and reducing the number of pump inspections and maintenance, reducing maintenance costs and inspection costs, and improving the operational reliability of the pump.
[0019] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:
[0021] Figure 1 It is a structural schematic diagram of a slurry circulation pump inlet pipeline assembly in the prior art;
[0022] Figure 2 is a schematic structural diagram of a slurry circulation pump inlet pipeline assembly provided by an exemplary embodiment of the present disclosure;
[0023] Figure 3 It is a schematic structural diagram of a flue gas desulfurization device provided in an exemplary embodiment of the present disclosure.
[0024] Description of Reference Numerals
[0025] 1-desulfurization absorption tower interface; 2-slurry circulation pump inlet; 31-pipeline body; 32-first connecting piece; 33-second connecting piece; 4-desulfurization absorption tower; 41-desulfurization layer; 411-smoke inlet; 42-spraying layer; 43-smoke exhaust layer; 431-smoke exhaust port; 5-slurry circulation pump; 6-demister DETAILED DESCRIPTION
[0026] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.
[0027] In the present disclosure, unless otherwise stated, the directional terms "upper", "lower", "top", and "bottom" are defined based on the directions in which the relevant components are actually used. "Inside" and "outside" refer to the contours of the corresponding components themselves. The terms "first", "second", etc. are used to distinguish different components and do not have order or importance. In the present disclosure, when the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.
[0028] Figure 1 This is a schematic diagram of the structure of the inlet pipeline assembly of the slurry circulation pump in the prior art. Since the diameter of the desulfurization absorption tower interface 1 is usually larger than the diameter of the slurry circulation pump inlet 2, a different-diameter pipeline is required to connect the two. The upper part of the different-diameter pipeline of the conventional solution is arranged obliquely, so that air gathers, which in turn causes cavitation of the pump, resulting in a reduction in the life of the pump and damage. For this reason, a connecting pipeline that can smoothly discharge air is required to prevent cavitation of the slurry circulation pump, which causes the slurry to solidify and the insufficient contact between the slurry and the flue gas, resulting in a high SO2 content in the discharged flue gas, causing serious pollution to the environment.
[0029] Reference Figure 2 , Figure 3 The present disclosure provides a slurry circulation pump inlet pipe assembly, which is used to be connected between a desulfurization absorber interface 1 and a slurry circulation pump inlet 2, wherein the diameter of the desulfurization absorber interface 1 is larger than the diameter of the slurry circulation pump inlet 2, and the slurry circulation pump inlet pipe assembly may include a pipe body 31, a first connecting piece 32 and a second connecting piece 33, wherein the pipe body 31 is transversely arranged between the desulfurization absorber interface 1 and the slurry circulation pump inlet 2, and the pipe diameter of the pipe body 31 gradually decreases from the desulfurization absorber interface 1 to the slurry circulation pump inlet 2, the top end of the pipe body 31 is horizontally arranged, and the bottom end of the pipe body 31 is inclined; the first connecting piece 32 is used to connect the pipe body 31 and the desulfurization absorber interface 1; the second connecting piece 33 is used to connect the pipe body 31 and the slurry circulation pump inlet 2.
[0030] Through the above technical solution, the eccentric reducer pipe with a horizontal upper part and a lower part contracting toward the center can be used to discharge the trapped air in time, greatly reducing the cavitation of the pump caused by the presence of air. The upper part of the pipe is kept horizontal, so that the air entering with the slurry can be discharged quickly, reducing the time of air retention, preventing the cavitation of the pump caused by air retention, allowing the slurry to fully contact the flue gas, reducing the content of SO2 in the flue gas, being safe and environmentally friendly, and reducing the number of pump inspections and maintenance, reducing maintenance costs and inspection costs, and improving the operational reliability of the pump.
[0031] Further, refer to Figure 2 The inclination angle of the bottom end of the pipe body 31 can be 10° to 45°, specifically 20°, 30°, or 40°, and can be adjusted according to actual needs to ensure that the top end of the pipe body 31 is level.
[0032] Specifically, the length of the pipe body 31 may be 500 mm to 1500 mm, and specifically may be 1000 mm. The length of the pipe body 31 and the inclination angle of the bottom end of the pipe body 31 need to be designed to be adaptive to each other.
[0033] Specifically, the diameter of the desulfurization absorption tower interface 1 can be 800 mm to 1500 mm, specifically 1000 mm or 1200 mm, and the diameter of the slurry circulation pump inlet 2 can be 500 mm to 800 mm, specifically 600 mm or 700 mm. In the embodiment of the present disclosure, the diameters of the two ports of the pipeline body 31 are respectively the same as the diameters of the desulfurization absorption tower interface 1 and the diameters of the slurry circulation pump inlet 2.
[0034] The material of the pipeline body 31 may be carbon steel, which has the advantages of high strength, high hardness, good corrosion resistance and weldability.
[0035] As an exemplary embodiment of the present disclosure, a rubber layer may be provided on the inner wall of the pipeline body 31. The rubber layer is corrosion-resistant and can prevent the desulfurization absorbent from directly corroding the pipeline body 31, thereby increasing the service life of the pipeline body 31.
[0036] In some embodiments, reference Figure 3 , the first connector 32 and the second connector 33 can both be flanges. Both ends of the pipeline body 31 are connected with flanges, and the desulfurization absorption tower interface 1 and the slurry circulation pump inlet 2 are also connected with flanges. The two flanges are connected by fasteners to achieve the connection and fixation of the pipeline body 31. It should be noted that the present disclosure does not limit the structure of the first connector 32 and the second connector 33.
[0037] In some embodiments, a filter screen may be installed at one end of the pipeline body 31 close to the desulfurization absorption tower interface 1. The desulfurization absorbent entering the pipeline body 31 first passes through the filter screen to filter out impurities, which can better protect the slurry circulation pump 5.
[0038] According to a second aspect of the present disclosure, referring to Figure 3 , a flue gas desulfurization device is also provided, which may include a desulfurization absorption tower 4, which may include a desulfurization layer 41, a spray layer 42 and a smoke exhaust layer 43 arranged in sequence from bottom to top, wherein a smoke inlet 411 is provided on one side of the desulfurization layer 41, and a desulfurization absorption tower interface 1 is provided on the other side, the spray layer 42 has an atomizing nozzle, and the atomizing nozzle is used to atomize the limestone slurry to the desulfurization layer 41, the flue gas desulfurization equipment also includes a slurry circulation pump 5, the slurry circulation pump 5 has a slurry circulation pump inlet 2 and a slurry circulation pump outlet, the slurry circulation pump inlet 2 is connected to the desulfurization absorption tower interface 1 through the above-mentioned slurry circulation pump inlet pipeline assembly, the slurry circulation pump outlet is connected to the spray layer 42, and the smoke exhaust layer 43 has a smoke exhaust port 431.
[0039] The undesulfurized raw flue gas enters the desulfurization absorption tower 4 and flows from bottom to top. The slurry circulation pump 5 drives the slurry at the bottom of the desulfurization layer 41 to increase its pressure and spray it downward from the atomizing nozzle above into the interior of the desulfurization layer 41, so that it can contact with the flue gas as much as possible to absorb SO2 in the flue gas. The flue gas contacts the atomized slurry in countercurrent to remove SO2. At the same time, the fallen limestone-gypsum re-enters the slurry pool, where the gypsum settles to the bottom of the desulfurization layer 41. The slurry is pumped out again by the slurry circulation pump 5, and the clean flue gas is discharged from the exhaust layer 43 of the exhaust layer 43 and then discharged into the atmosphere. Among them, the bottom of the desulfurization absorption tower 4 is a gypsum slurry pool, and the normal liquid level must be maintained during operation. An eccentric reducing pipe is set between the slurry circulation pump 5 and the desulfurization absorption tower 4. The upper part of the pipe is kept horizontal, so that the air entering with the slurry can be quickly discharged, reducing the air retention time and preventing the cavitation of the pump caused by air retention. The flue gas desulfurization equipment has all the beneficial effects of the above-mentioned slurry circulation pump inlet pipeline assembly, which will not be repeated here. In the embodiment of the present disclosure, the slurry circulation pump 5 is located relatively low, which can fully mix and pump out the slurry, while reducing the power consumption of the slurry circulation pump 5 and reducing the subsequent investment cost of the power plant.
[0040] Further, refer to Figure 3 A demister 6 may be provided in the smoke exhaust layer 43. After the purified smoke passes through the demister 6 in the smoke exhaust layer 43 to remove droplets, the clean smoke is discharged into the atmosphere through the smoke exhaust port 431.
[0041] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.
[0042] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.
[0043] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.
Claims
1. A slurry circulation pump inlet pipeline assembly, used to connect between the desulfurization absorption tower interface and the slurry circulation pump inlet, wherein: The diameter of the desulfurization absorption tower interface is larger than the diameter of the slurry circulation pump inlet, and is characterized in that the slurry circulation pump inlet pipeline assembly includes: A pipeline body is arranged transversely between the desulfurization absorption tower interface and the slurry circulation pump inlet, the diameter of the pipeline body gradually decreases from the desulfurization absorption tower interface to the slurry circulation pump inlet, the top end of the pipeline body is arranged horizontally, and the bottom end of the pipeline body is arranged obliquely; A first connecting piece, used to connect the pipeline body and the desulfurization absorption tower interface; and The second connecting piece is used to connect the pipeline body and the inlet of the slurry circulation pump.
2. The slurry circulation pump inlet pipeline assembly according to claim 1, characterized in that: The inclination angle of the bottom end of the pipe body is 10° to 45°.
3. The slurry circulation pump inlet pipe assembly according to claim 1, characterized in that: The length of the pipeline body is 500 mm to 1500 mm.
4. The slurry circulation pump inlet pipe assembly according to claim 1, characterized in that: The diameter of the interface of the desulfurization absorption tower is 800 mm to 1500 mm, and the diameter of the inlet of the slurry circulation pump is 500 mm to 800 mm.
5. The slurry circulation pump inlet pipe assembly according to claim 1, characterized in that: The material of the pipeline body is carbon steel.
6. The slurry circulation pump inlet pipe assembly according to claim 1, characterized in that: The inner wall of the pipe body is provided with a rubber layer.
7. The slurry circulation pump inlet pipe assembly according to claim 1, characterized in that: The first connecting member and the second connecting member are both flanges.
8. The slurry circulation pump inlet pipe assembly according to claim 1, characterized in that: A filter screen is installed at one end of the pipeline body close to the interface of the desulfurization absorption tower.
9. A flue gas desulfurization equipment, characterized in that: It includes a desulfurization absorption tower, which includes a desulfurization layer, a spray layer and a smoke exhaust layer arranged in sequence from bottom to top, wherein a smoke inlet is opened on one side of the desulfurization layer, and a desulfurization absorption tower interface is opened on the other side, the spray layer has an atomizing nozzle, and the atomizing nozzle is used to atomize the limestone slurry to the desulfurization layer. The flue gas desulfurization equipment also includes a slurry circulation pump, and the slurry circulation pump has a slurry circulation pump inlet and a slurry circulation pump outlet. The slurry circulation pump inlet is connected to the desulfurization absorption tower interface through the slurry circulation pump inlet pipeline assembly described in any one of claims 1 to 8, the slurry circulation pump outlet is connected to the spray layer, and the smoke exhaust layer has a smoke exhaust port.
10. The flue gas desulfurization equipment according to claim 9, characterized in that: A demister is arranged in the smoke exhaust layer.