A desulfurization wet mill limestone slurry preparation system

Abstract

The present application relates to wet desulfurization equipment technical field, especially to a kind of desulfurization wet mill limestone slurry preparation system, including overflow tank, feed tank and cyclone, the feed tank bottom is connected with wet ball mill outlet, the feed tank side wall pipe is connected with cyclone, the cyclone is connected with overflow tank and underflow tank, overflow tank side is equipped with overflow port and recirculation port from top to bottom, the recirculation port is connected with recirculation slurry tank by recirculation pipeline, electric regulating valve is arranged on the recirculation pipeline, and the electric regulating valve is connected with controller.The present application is also provided with electric regulating valve, which is controlled by controller and liquid level transmitter, can stabilize recirculation slurry flow, guarantee classification screening efficiency, significantly improve limestone slurry preparation fineness, meet the requirement of subsequent desulfurization process to slurry fineness.

Description

Technical Field

[0001] This invention relates to the field of wet desulfurization equipment technology, and in particular to a limestone slurry preparation system for a wet desulfurization mill. Background Technology

[0002] In the desulfurization wet grinding pulping system, the limestone hydrocyclone station plays a key role in slurry classification. Its operating status directly affects the pulping efficiency, slurry fineness, and system energy consumption, making it an important piece of equipment to ensure the stable and efficient operation of the desulfurization process.

[0003] The existing desulfurization wet grinding slurry system has significant drawbacks in its recirculation adjustment. In the limestone hydrocyclone station, recirculation is primarily achieved by adjusting the recirculation slurry tank level via an electric recirculation valve, which can only be fully closed or fully open. When the electric recirculation valve is closed, all overflow slurry from the hydrocyclone station is treated as qualified slurry and flows into the limestone slurry tank through the overflow pipe. However, when the electric valve is open, all overflow slurry enters the recirculation pipe and ultimately flows into the recirculation slurry tank, failing to produce qualified slurry.

[0004] This unreasonable process design results in the inability to continuously produce qualified limestone slurry. When the recirculation electric valve is fully open, the equipment is doing useless work. When the recirculation electric valve is fully closed, the limestone slurry suffers from reduced fineness and low slurry production efficiency. The process urgently needs to be optimized and improved. Summary of the Invention

[0005] The purpose of this invention is to provide a limestone slurry preparation system for a desulfurization wet grinding mill, which can improve the fineness of the slurry preparation, reduce desulfurization energy consumption, and thus improve desulfurization efficiency.

[0006] This invention provides a limestone slurry preparation system for a desulfurization wet grinding mill, comprising a wet ball mill and a limestone hydrocyclone station. The limestone hydrocyclone station includes an overflow box, a feed box, and a hydrocyclone. The feed box has a side wall pipe connected to the hydrocyclone, and the hydrocyclone is connected to the overflow box and an underflow box. The bottom of the underflow box is connected to the inlet of the wet ball mill. The overflow box has an overflow port and a recirculation port on its side from top to bottom. The recirculation port is connected to a recirculation slurry tank through a recirculation pipe. An electrically adjustable valve is provided on the recirculation pipe, and the electrically adjustable valve is connected to a controller.

[0007] Preferably, the top of the vortex generator is connected to the overflow box, and the bottom of the vortex generator is connected to the underflow box.

[0008] Preferably, the outlet of the recirculating slurry tank is connected to the feed tank via a return pipe.

[0009] Preferably, a reflux pump is provided on the reflux pipe.

[0010] Preferably, a density meter is provided at the outlet of the reflux pump.

[0011] Preferably, the outlet of the wet ball mill is connected to the inlet of the recirculating slurry tank.

[0012] Preferably, the overflow port is connected to the limestone slurry tank via an overflow pipe.

[0013] Preferably, the recirculating slurry tank is equipped with a level transmitter, which is used to monitor the slurry level in the tank and is connected to the controller.

[0014] Preferably, when the liquid level in the level transmitter monitoring box exceeds a threshold, the controller receives a signal and reduces the opening of the electric regulating valve; when the liquid level in the level transmitter monitoring box is below the threshold, the controller receives a signal and increases the opening of the electric regulating valve.

[0015] Preferably, a flow meter is provided at the inlet of the return pipe, the flow meter is used to monitor the flow rate of the circulating slurry, and the flow meter is connected to the controller.

[0016] Beneficial effects: This invention uses a cyclone separator to classify and screen the slurry. The finer slurry is introduced into the overflow box, while the coarser slurry is introduced into the underflow box and returned to the wet ball mill for re-grinding, thereby realizing the recycling and re-grinding of coarse materials and improving the overall uniformity of slurry fineness.

[0017] The present invention also includes an electrically adjustable valve, which is controlled by a controller in conjunction with a level transmitter. This stabilizes the recirculated slurry flow rate, ensures the efficiency of grading and screening, significantly improves the fineness of limestone slurry preparation, and meets the requirements of subsequent desulfurization processes for slurry fineness. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0020] Explanation of reference numerals in the attached figures: 1- Limestone hydrocyclone station, 101- Overflow box, 102- Feed box, 103- Hydrocyclone, 104- Underflow box, 2- Wet ball mill, 3- Limestone slurry tank, 4- Recirculating slurry tank, 401- Level transmitter, 5- Recirculation pipeline, 501- Electric regulating valve, 6- Return pipeline, 601- Densitometer, 602- Return pump, 603- Flow meter. Detailed Implementation

[0021] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention 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 limiting this invention.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; and they may refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0024] Example 1 like Figure 1 As shown, a limestone slurry preparation system for a desulfurization wet grinding mill includes a wet ball mill 2 and a limestone hydrocyclone station 1. The limestone hydrocyclone station 1 includes an overflow box 101, a feed box 102, and a hydrocyclone 103. The feed box 102 has a feed inlet at its bottom, through which the initially prepared slurry enters (this step is omitted in the figure). A pipe on the side wall of the feed box 102 connects to the hydrocyclone 103. The hydrocyclone 103 connects to the overflow box 101 and the underflow box 104. The top of the hydrocyclone 103 is connected to the overflow box 101, and the bottom of the hydrocyclone 103 is connected to the underflow box 104. The hydrocyclone 103 classifies the slurry; the slurry with lower fineness after separation enters the overflow box 101, while the slurry with larger particles enters the underflow box 104.

[0025] The bottom of the underflow box 104 is connected to the inlet of the wet ball mill 2, and the outlet of the wet ball mill 2 is connected to the inlet of the recirculating slurry tank 4. The wet ball mill 2 is used to grind the slurry with larger particles in the underflow box 104, and the treated slurry enters the recirculating slurry tank 4 for recirculation.

[0026] The overflow tank 101 has an overflow port and a recirculation port on its side from top to bottom. The overflow port is connected to the limestone slurry tank 3 through an overflow pipe. The limestone slurry tank 3 is used to load qualified slurry. The slurry particles in the overflow tank 101 settle under the action of gravity, and the slurry flowing out of the overflow port has a high fineness.

[0027] The recirculation port is connected to the recirculation slurry tank 4 via recirculation pipe 5. An electrically adjustable valve 501 is installed on recirculation pipe 5, and the valve is connected to a controller. The electrically adjustable valve 501 offers fast response and high adjustment accuracy, enabling closed-loop control of the recirculation slurry flow rate, ensuring stable slurry level in the recirculation slurry tank 4, and guaranteeing stable slurry recirculation.

[0028] A level transmitter 401 is installed inside the recirculating slurry tank 4 to monitor the slurry level inside the tank. The level transmitter 401 is connected to a controller. The controller adjusts the opening of the electric regulating valve 501 based on the monitoring results of the level transmitter 401. Adjusting the opening of the electric regulating valve 501 according to the slurry level in the recirculating slurry tank 4 ensures that the slurry level in the recirculating slurry tank 4 remains stable, preventing the slurry from running dry and the return pump 602 from operating without load. At the same time, it ensures that the overflow tank 101 continuously produces qualified slurry, guaranteeing higher fineness and quality of the limestone slurry.

[0029] When the liquid level in the monitoring tank is higher than the threshold, the controller receives the signal and reduces the opening of the electric regulating valve 501 to decrease the amount of recirculated slurry entering until the liquid level drops to the normal range. When the liquid level in the monitoring tank is lower than the threshold, the controller receives the signal and increases the opening of the electric regulating valve 501 to increase the amount of recirculated slurry entering. At the same time, the speed of the return pump 602 can be adjusted to ensure the stability of the liquid level in the recirculated slurry tank 4.

[0030] The outlet of the recirculating slurry tank 4 is connected to the feed tank 102 via a return pipe 6. A return pump 602 is installed on the return pipe 6, and a density meter 601 is installed at the outlet of the return pump 602. The density meter 601 monitors the density of the recirculated slurry in real time and transmits the density signal to the controller. A flow meter 603 is installed at the inlet of the return pipe 6 to monitor the flow rate of the recirculated slurry. The flow meter 603 is connected to the controller. Based on the monitoring results of the flow meter 603, the controller adjusts the rotational speed of the return pump 602.

[0031] Once the electric regulating valve 501 is closed, all the slurry in the overflow tank 101 enters the limestone slurry tank 3. The slurry is not recirculated, resulting in a decrease in fineness. Precise grading control and density monitoring ensure stable fineness and concentration of the qualified slurry.

[0032] Work process: The initially prepared slurry enters the feed box 102 through the feed inlet. Then, the slurry in the feed box 102 enters the hydrocyclone 103 through the pipeline. The hydrocyclone 103 classifies the slurry. The slurry with higher fineness enters the overflow box 101, and the slurry with coarser particles enters the underflow box 104. The coarse slurry in the underflow box 104 is transported to the wet ball mill 2 for grinding, so as to realize the recycling of coarse particles. The finer slurry at the top of the overflow tank 101 is discharged through the overflow port to the limestone slurry tank 3, while the relatively coarser slurry is discharged through the recirculation port to the recirculation slurry tank 4 for recirculation treatment. The slurry is then reclassified to ensure that the qualified slurry discharged from the overflow port has a higher fineness.

[0033] During the recirculation process, the controller adjusts the opening of the electrically controlled regulating valve 501 based on the monitoring results of the level transmitter 401. If the level transmitter 401 detects that the liquid level in the tank is above the threshold, the controller receives the signal and reduces the opening of the electrically controlled regulating valve 501, decreasing the amount of recirculated slurry entering until the liquid level drops to the normal range. If the level transmitter 401 detects that the liquid level in the tank is below the threshold, the controller receives the signal and increases the opening of the electrically controlled regulating valve 501, increasing the amount of recirculated slurry entering. Simultaneously, the speed of the return pump 602 can be adjusted to ensure a stable liquid level in the recirculated slurry tank 4. This adjustment method ensures the amount of slurry participating in the recirculation, improves the fineness of the slurry preparation, reduces desulfurization energy consumption, and thus improves desulfurization efficiency.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A limestone slurry preparation system for a desulfurization wet grinding mill, characterized in that, The system includes a wet ball mill and a limestone hydrocyclone station. The limestone hydrocyclone station includes an overflow box, a feed box, and a hydrocyclone. The feed box has a side wall pipe connected to the hydrocyclone. The hydrocyclone is connected to the overflow box and the underflow box. The bottom of the underflow box is connected to the inlet of the wet ball mill. The overflow box has an overflow port and a recirculation port on its side from top to bottom. The recirculation port is connected to a recirculation slurry tank through a recirculation pipe. An electrically adjustable valve is installed on the recirculation pipe, and the electrically adjustable valve is connected to a controller.

2. The limestone slurry preparation system for a desulfurization wet grinding mill according to claim 1, characterized in that, The top of the cyclone is connected to the overflow box, and the bottom of the cyclone is connected to the underflow box.

3. The limestone slurry preparation system for a desulfurization wet mill according to claim 1, characterized in that, The outlet of the recirculating slurry tank is connected to the feed tank via a return pipe.

4. The limestone slurry preparation system for a desulfurization wet mill according to claim 1, characterized in that, A return pump is installed on the return pipe.

5. The limestone slurry preparation system for a desulfurization wet grinding mill according to claim 4, characterized in that, A density meter is installed at the outlet of the reflux pump.

6. The limestone slurry preparation system for a desulfurization wet mill according to claim 1, characterized in that, The outlet of the wet ball mill is connected to the inlet of the recirculating slurry tank.

7. The limestone slurry preparation system for a desulfurization wet mill according to claim 1, characterized in that, The overflow port is connected to the limestone slurry tank via an overflow pipe.

8. The limestone slurry preparation system for a desulfurization wet grinding mill according to claim 1, characterized in that, The recirculating slurry tank is equipped with a level transmitter, which is used to monitor the slurry level in the tank and is connected to the controller.

9. The limestone slurry preparation system for a desulfurization wet grinding mill according to claim 8, characterized in that, When the liquid level in the monitoring tank of the level transmitter exceeds the threshold, the controller receives the signal and reduces the opening of the electric regulating valve; when the liquid level in the monitoring tank of the level transmitter is below the threshold, the controller receives the signal and increases the opening of the electric regulating valve.

10. The limestone slurry preparation system for a desulfurization wet mill according to claim 3, characterized in that, A flow meter is installed at the inlet of the return pipe. The flow meter is used to monitor the flow rate of the circulating slurry and is connected to the controller.

Images