Auxiliary stirring device for limestone slurry tank of desulfurization system

Abstract

The invention provides an auxiliary stirring device for a limestone slurry tank of a desulfurization system. The auxiliary stirring device comprises the limestone slurry tank, a pulse pipeline, a stirrer, a self-circulation pipeline and a power pump. The pulse pipeline and the stirrer are both arranged in the limestone slurry tank, and the pulse pipeline is arranged above a stirring blade of the stirrer by a certain distance. The inlet end of the self-circulation pipeline is communicated with the bottom of the limestone slurry box, and the outlet end of the self-circulation pipeline is communicated with the pulse pipeline through the power pump to form a circulation loop that slurry is pumped out from the box bottom, pressurized by the power pump and then returned to the pulse pipeline. In the operation period of the power pump, the self-circulation slurry returns to the pulse pipeline in the box, and the problem that limestone slurry mixed with calcium carbide slurry is deposited and scaled in the slurry box can be effectively solved through the impact jet flow effect of the self-circulation slurry.

Description

Technical Field

[0001] This invention belongs to the technical field of mixing equipment, and specifically relates to an auxiliary mixing device for limestone slurry tank in a desulfurization system. Background Technology

[0002] In the limestone-gypsum wet desulfurization process, the limestone slurry tank is the core storage and distribution unit. Its core function is to store and continuously distribute limestone slurry, ensuring a stable supply of absorbent with the required concentration (typically 20%-30%) to the absorber tower. This is a crucial piece of equipment for guaranteeing desulfurization efficiency. During operation, process water and dry limestone powder are added to the slurry tank to adjust the slurry concentration to the optimal reaction range. To prevent the sedimentation and caking of solid particles in the slurry, the slurry tank is usually equipped with a stirrer for continuous agitation, thereby ensuring the uniformity of the slurry and the stable operation of the slurry supply pump.

[0003] To improve the reactivity of desulfurizing agents and reduce operating costs, power plants commonly use calcium carbide sludge mixed with limestone powder as an absorbent. However, the main component of calcium carbide sludge is calcium hydroxide, and its fineness is significantly higher than that of limestone powder. This difference in physical properties makes the mixed slurry with calcium carbide sludge more prone to precipitation and less stable. During long-term operation, excessively fine particles easily deposit and harden at the bottom of the slurry tank, forming a solid scale layer. This not only reduces the effective volume of the slurry tank but also frequently causes blockage of the outlet slurry pump, seriously affecting the safe, stable, and continuous operation of the desulfurization system and increasing maintenance workload and operating costs.

[0004] Therefore, there is an urgent need in the existing technology to develop a method or device that can effectively solve the problem of limestone slurry mixed with calcium carbide mud depositing and scaling in the slurry tank, so as to ensure the long-term stable operation of the desulfurization system. Summary of the Invention

[0005] The purpose of this invention is to provide an auxiliary stirring device for limestone slurry tank in a desulfurization system, which can effectively solve the problem of limestone slurry mixed with calcium carbide mud depositing and scaling in the slurry tank.

[0006] To solve the above-mentioned technical problems, the present invention provides an auxiliary stirring device for limestone slurry tank in a desulfurization system, comprising a limestone slurry tank, a pulse pipeline, a stirrer, a self-circulating pipeline, and a power pump;

[0007] The limestone slurry tank is equipped with the pulse pipe and the agitator, with the pulse pipe located above the agitator blades.

[0008] The inlet end of the self-circulating pipe is connected to the bottom of the limestone slurry tank, the middle section of the self-circulating pipe extends to the top of the limestone slurry tank and into the limestone slurry tank, the outlet end of the self-circulating pipe is connected to the pulse pipe, and the power pump is connected in series with the self-circulating pipe.

[0009] Optionally, in the above-mentioned auxiliary stirring device for limestone slurry tank in the desulfurization system, the pulse pipe is horizontally positioned above the stirring blades of the stirrer.

[0010] Optionally, in the above-mentioned auxiliary stirring device for limestone slurry tank in the desulfurization system, the pulse pipeline is arranged at a height at least 1m away from the bottom of the limestone slurry tank.

[0011] Optionally, in the above-mentioned auxiliary stirring device for limestone slurry tank in the desulfurization system, the pulse pipeline is connected end to end and has a ring structure.

[0012] Optionally, in the above-mentioned auxiliary stirring device for limestone slurry tank in the desulfurization system, several outlets are evenly provided on the pulse pipeline.

[0013] Optionally, in the above-mentioned auxiliary stirring device for the limestone slurry tank of the desulfurization system, the self-circulating pipe located between the top of the limestone slurry tank and the pulse pipe has a gradually decreasing diameter in the direction from high to low.

[0014] Optionally, in the above-mentioned auxiliary stirring device for the limestone slurry tank of the desulfurization system, the self-circulating pipe located between the top of the limestone slurry tank and the pulse pipe is arranged vertically.

[0015] Optionally, the auxiliary stirring device for the limestone slurry tank in the above-mentioned desulfurization system also includes a discharge branch for communication with the self-circulating pipeline, the discharge branch being used to connect with the absorption tower.

[0016] Optionally, in the above-mentioned auxiliary stirring device for limestone slurry tank in the desulfurization system, the limestone slurry tank is a vertical cylindrical structure.

[0017] Optionally, in the above-mentioned auxiliary stirring device for limestone slurry tank in the desulfurization system, the stirrer is installed in a top-insertion type.

[0018] This invention provides an auxiliary stirring device for a limestone slurry tank in a desulfurization system, which has the following advantages:

[0019] Both the pulse pipe and the agitator are located inside the limestone slurry tank, with the pulse pipe positioned a certain distance above the agitator's impeller. The inlet end of the self-circulating pipe is connected to the bottom of the limestone slurry tank, and the outlet end is connected to the pulse pipe via a power pump, forming a circulation loop where the slurry is drawn from the bottom of the tank, pressurized by the power pump, and then returns to the pulse pipe. During the operation of the power pump, the self-circulating slurry returns to the pulse pipe inside the tank. Utilizing the impact jet effect of the self-circulating slurry, the problem of scale deposition in the limestone slurry mixed with calcium carbide sludge within the slurry tank can be effectively solved. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of an auxiliary stirring device for a limestone slurry tank in a desulfurization system, provided in an embodiment of the present invention.

[0022] In the image above:

[0023] 100 - Limestone slurry tank; 110 - Pulse pipeline; 120 - Agitator;

[0024] 200-Power Pump;

[0025] 300-Absorption Tower. Detailed Implementation

[0026] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0027] The core of this invention is to provide an auxiliary stirring device for limestone slurry tank in a desulfurization system, which can effectively solve the problem of limestone slurry mixed with calcium carbide mud depositing and scaling in the slurry tank.

[0028] To enable those skilled in the art to better understand the technical solutions provided by the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] For details, please refer to Figure 1The present invention provides an auxiliary stirring device for a limestone slurry tank in a desulfurization system, comprising: a limestone slurry tank 100, a pulse pipeline 110, a stirrer 120, a self-circulating pipeline, and a power pump 200.

[0030] The limestone slurry tank 100 serves as a container for mixing limestone slurry. Specifically, it can be a vertical cylindrical structure, with its diameter and height designed according to process requirements. A drain port can also be provided at the bottom of the limestone slurry tank 100 for draining the slurry during maintenance. The limestone slurry tank 100 is equipped with a pulse pipe 110 and a stirrer 120.

[0031] The agitator 120 can be installed in a top-insertion type, specifically in the form of a reducer driving an agitator shaft, which extends into the limestone slurry tank 100, with the lower end connected to the agitator blades. Preferably, the agitator blades can be a two-layer inclined blade design to better adapt to the height of the slurry tank and achieve overall circulation of the upper and lower layers of slurry.

[0032] The self-circulating pipeline is a key component connecting the bottom of the limestone slurry tank 100, the power pump 200, and the pulse pipeline 110. The inlet end of the self-circulating pipeline connects to the bottom of the limestone slurry tank 100, and can typically be connected to the existing outlet of the limestone slurry tank 100 or a dedicated interface can be added. The middle section of the self-circulating pipeline extends to the top of the limestone slurry tank 100 and into the tank, such as... Figure 1 As shown, the self-circulating pipe extends upward from the middle section, passes through the top plate of the limestone slurry tank 100, and then bends downward into the limestone slurry tank 100. The outlet end of the self-circulating pipe is connected to the pulse pipe 110.

[0033] A power pump 200 is connected in series with the self-circulating pipeline to provide power for the slurry circulation. This power pump can be a stand-alone pump or it can utilize an existing limestone slurry pump in the system (with partial fluid circulation achieved by switching valves).

[0034] This invention provides an auxiliary stirring device for a limestone slurry tank in a desulfurization system. Both a pulse pipe 110 and a stirrer 120 are located inside the limestone slurry tank 100, with the pulse pipe 110 positioned a certain distance above the stirring blades of the stirrer 120. The inlet end of a self-circulating pipe is connected to the bottom of the limestone slurry tank 100, and the outlet end of the self-circulating pipe is connected to the pulse pipe 110 via a power pump 200, forming a circulation loop where the slurry is drawn from the bottom of the tank, pressurized by the power pump 200, and then returns to the pulse pipe 110. During the operation of the power pump 200, the self-circulating slurry returns to the pulse pipe 110 inside the tank. The impact jet effect of the self-circulating slurry effectively solves the problem of scale deposition in the slurry tank of limestone slurry mixed with calcium carbide sludge. Furthermore, this solution offers low modification costs for the auxiliary stirring device in the limestone slurry tank of the desulfurization system, and the pulse pipe 110 can temporarily replace the stirrer during periods of stirrer failure in the limestone slurry tank.

[0035] In a specific embodiment, the pulse conduit 110 is horizontally positioned inside the limestone slurry tank 100, above the agitator blades of the stirrer 120. The pulse conduit 110 is positioned at least 1 meter above the bottom of the limestone slurry tank 100. This design aims to prevent the high-speed pulsed slurry flow from directly scouring the tank bottom and reducing wear. Preferably, it is 1.2 to 1.5 meters high, which ensures that the jet effectively acts on the slurry body while avoiding excessive scouring of the tank bottom material.

[0036] To enhance corrosion resistance, the pulse pipe 110 is preferably made of corrosion-resistant and wear-resistant materials, such as fiber-reinforced plastics, which have high strength and good corrosion resistance. The surfaces of the agitator shaft and impeller can be coated with synthetic rubber.

[0037] In a specific embodiment, a ring of pulse pipes 110 can be arranged around the bottom wall of the limestone slurry tank 100. The two ends of the pulse pipes 110 are connected to each other to form a closed ring structure, and the ring pipes are arranged circumferentially along the inner wall of the limestone slurry tank 100. A series of outlets (which can be used as nozzles) are evenly opened on the sides and bottom of the pulse pipes 110. These outlets face different directions to ensure that the slurry jet can cover the easily deposited areas at the bottom of the tank, especially the parts near the tank wall.

[0038] The self-circulating pipe has a unique design in the section between the top of the limestone slurry tank 100 and the pulse pipe 110. To further enhance the jetting effect, the self-circulating pipe located between the top of the limestone slurry tank 100 and the pulse pipe 110 gradually narrows in diameter along the flow direction, forming a tapered pipe structure. Due to the high concentration of limestone slurry (approximately 25%), the slurry requires a sufficiently high instantaneous flow velocity to effectively break through the formed sediment layer. Therefore, the original limestone slurry pump's self-circulating pipe needs to be diameter-reduced upon entering the tank, gradually narrowing the diameter to increase the pipe pressure. After the diameter reduction, the self-circulating pipe connects with the pulse pipe 110 inside the tank. This diameter-reduction design aims to increase the pressure and velocity of the slurry flowing through this section, thereby generating a stronger jetting effect at the outlet of the pulse pipe 110.

[0039] The self-circulating pipe located between the top of the limestone slurry tank 100 and the pulse pipe 110, such as Figure 1 The diagram shows segment a to b, arranged vertically.

[0040] This scheme also includes a discharge branch for connection to the self-circulation pipeline, which connects to the absorption tower 300. The discharge branch is an important extended function of this unit. A branch pipeline, i.e., the discharge branch, can be installed on the self-circulation pipeline. This branch, controlled by a valve, can be used to transport the slurry to the absorption tower 300. During normal desulfurization operation, this discharge branch can serve as one of the channels for supplying slurry to the absorption tower 300. When the auxiliary stirring function needs to be activated, the valve is switched to direct some or all of the slurry to the pulse pipeline 110.

[0041] The working process of this solution mainly includes two modes: collaborative stirring mode and standby stirring mode.

[0042] In the coordinated mixing mode, the agitator 120 and the power pump 200 operate simultaneously. The slurry within the limestone slurry tank 100 remains essentially suspended under the action of the agitator. Simultaneously, the power pump 200 starts, drawing slurry from the bottom of the limestone slurry tank 100. The slurry is transported through a self-circulating pipe, where its flow rate and pressure are increased as it flows through the top tapering section. Subsequently, the high-pressure slurry enters the annular pulse pipe 110 and is ejected in jet form through multiple outlets. These jets provide supplementary mixing to the upper and middle parts of the limestone slurry tank 100, particularly in areas where mechanical mixing may be relatively weak (such as areas near the tank walls), further disrupting the slurry structure, preventing solid particle sedimentation, and thus achieving a more uniform suspension effect.

[0043] In standby stirring mode (i.e., when stirrer 120 is shut down due to a malfunction), power pump 200 and the self-circulation system operate as independent units. Power pump 200 draws slurry from the bottom of the tank; even if there is slight sediment at the bottom, the pump's suction can carry some of the sediment into circulation. The high-speed slurry jet through pulse pipe 110 strongly disturbs the slurry in the tank, forming a macro-circulation sufficient to suppress the formation of large-scale sedimentation in a short time, buying time for stirrer 120 maintenance. At this time, if slurry needs to be supplied to absorber tower 300, it can be adjusted through the valve on the discharge branch, ensuring the auxiliary stirring function while meeting the slurry requirements of the desulfurization system.

[0044] The beneficial effects of the technical solution provided by this invention include:

[0045] 1. High reliability: Provides an effective backup mixing method in case of agitator 120 failure, greatly reducing the risk of slurry sedimentation and system shutdown due to agitator failure.

[0046] 2. Enhanced stirring effect: The pulse jet and mechanical stirring work together to eliminate stirring dead zones, especially improving the flow field near the tank wall, making the slurry more uniform and conducive to the subsequent desulfurization reaction.

[0047] 3. Easy to implement: It makes full use of existing slurry pumps and self-circulating pipelines, requires few additional parts, and is easy to install, making it particularly suitable for the technical transformation of existing desulfurization systems.

[0048] 4. Easy maintenance: Major components such as the pulse pipeline 110 have no moving parts, resulting in minimal wear and low maintenance workload. Key equipment, such as the power pump 200, is located outside the limestone slurry tank 100, facilitating inspection and maintenance.

[0049] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0050] As indicated in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "a," and / or "the" are not specifically singular and may include the plural. Generally, the terms "comprising" and "including" only indicate the inclusion of expressly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements. An element defined by the phrase "comprising an..." does not exclude the presence of other identical elements in the process, method, product, or apparatus that includes the element.

[0051] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0052] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0053] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. An auxiliary stirring device for a limestone slurry tank in a desulfurization system, characterized in that, Includes limestone slurry tank (100), pulse pipeline (110), agitator (120), self-circulating pipeline and power pump (200). The limestone slurry tank (100) is equipped with the pulse pipe (110) and the agitator (120), with the pulse pipe (110) located above the agitator blades of the agitator (120). The inlet end of the self-circulating pipe is connected to the bottom of the limestone slurry tank (100), the middle section of the self-circulating pipe extends to the top of the limestone slurry tank (100) and extends into the limestone slurry tank (100), the outlet end of the self-circulating pipe is connected to the pulse pipe (110), and the power pump (200) is connected in series with the self-circulating pipe.

2. The auxiliary stirring device for the limestone slurry tank in the desulfurization system according to claim 1, characterized in that, The pulse pipe (110) is horizontally positioned above the stirring blades of the agitator (120).

3. The auxiliary stirring device for the limestone slurry tank in the desulfurization system according to claim 2, characterized in that, The pulse pipe (110) is arranged at a height of at least 1m from the bottom of the slurry tank (100).

4. The auxiliary stirring device for the limestone slurry tank in the desulfurization system according to claim 1, characterized in that, The pulse channel (110) is connected end to end and has a ring structure.

5. The auxiliary stirring device for the limestone slurry tank in the desulfurization system according to claim 4, characterized in that, The pulse pipe (110) has several outlets evenly distributed on it.

6. The auxiliary stirring device for the limestone slurry tank in the desulfurization system according to claim 1, characterized in that, The self-circulating pipe located between the top of the limestone slurry tank (100) and the pulse pipe (110) gradually narrows in diameter from high to low.

7. The auxiliary stirring device for the limestone slurry tank in the desulfurization system according to claim 6, characterized in that, The self-circulating pipe located between the top of the limestone slurry tank (100) and the pulse pipe (110) is arranged vertically.

8. The auxiliary stirring device for the limestone slurry tank in the desulfurization system according to claim 1, characterized in that, It also includes a discharge branch for communication with the self-circulating pipeline, the discharge branch being used in connection with the absorption tower (300).

9. The auxiliary stirring device for the limestone slurry tank in the desulfurization system according to claim 1, characterized in that, The limestone slurry tank (100) is a vertical cylindrical structure.

10. The auxiliary stirring device for the limestone slurry tank of the desulfurization system according to claim 1, characterized in that, The agitator (120) is top-insertion type.

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