Anti-blocking method for spraying layer of slurry circulating pump

Abstract

The invention relates to the field of desulfurization systems, and discloses an anti-blocking method for a slurry circulating pump spraying layer, which comprises a source control step of controlling the quality of reuse water entering a desulfurization system and the quality of slurry in an absorption tower, a process optimization step of optimizing the operation logic of the spraying layer and the spatial layout of a nozzle, and a control step of controlling the spraying layer. A state monitoring step: monitoring the outlet pressure of the slurry circulating pump in real time; a maintenance guarantee step: maintaining the damaged spraying layer, and improving the acceptance standard during the acceptance period; by setting the source control step, the process optimization step, the state monitoring step and the maintenance and guarantee step, the blockage condition of the spraying layer can be effectively reduced, so that the aim of actively preventing blockage is fulfilled, the shutdown maintenance condition caused by the damage of the spraying layer is reduced, the production efficiency is improved, the production cost is reduced, and the product quality is improved. And the working pressure of maintenance personnel is reduced, and resource waste is reduced.

Description

Technical Field

[0001] This invention relates to the field of desulfurization systems, and in particular to a method for preventing clogging of the spray layer of a slurry circulation pump. Background Technology

[0002] In wet desulfurization systems of coal-fired power plants, clogging of the nozzles in the absorption tower spray layer and breakage of the spray layer pipes and nozzles are key problems affecting desulfurization efficiency and equipment reliability.

[0003] However, currently, when blockages or breaks occur, they generally require shutdown or unit rescheduling to address the issue, heavily relying on grid rescheduling plans and failing to intervene in a timely manner. This leads to the problem continuing to worsen, resulting in low desulfurization efficiency and the risk of exceeding environmental standards. For severe blockages, destructive openings may even be necessary for cleaning, making the repair process complex and affecting structural strength.

[0004] Therefore, there is an urgent need for a proactive prevention solution to reduce the clogging or breakage of the spray layer. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is that there is currently a lack of methods for actively preventing the spray layer from becoming clogged or broken.

[0006] The above-mentioned technical problems are solved by the following technical solution: This invention proposes a method for preventing clogging of the spray layer of a slurry circulation pump, which includes,

[0007] Source control steps: Control the quality of reclaimed water entering the desulfurization system and the quality of slurry in the absorption tower;

[0008] Process optimization steps: Optimize the operating logic of the spray layer and the spatial layout of the nozzles;

[0009] Status monitoring steps: Real-time monitoring of the slurry circulation pump outlet pressure;

[0010] Maintenance and protection steps: Repair the damaged spray layer and raise the acceptance standards during the acceptance period.

[0011] In a preferred embodiment of the anti-clogging method for the spray layer of the slurry circulation pump described in this invention: the source control step includes...

[0012] Reduce the solids and oil content of the reclaimed water entering the desulfurization system;

[0013] The pH value of the reclaimed water entering the desulfurization system should be controlled between 6 and 9, and the chloride ion content should be below 600 mg / L.

[0014] In a preferred embodiment of the anti-clogging method for the spray layer of the slurry circulation pump described in this invention: the source control step further includes...

[0015] The pH value of the slurry should be controlled between 5 and 6, and the density of the slurry should be 1060 kg / m³. 3 ~1140Kg / m 3 between;

[0016] Based on the total mass of the slurry, the solid content of the slurry is between 15% and 20%.

[0017] Based on the mass of solid substances, the solid substances contain CaCO3 < 3%, CaSO4·2H2O > 90%, CaSO3·1 / 2H2O < 1%, and SiO2 < 3%;

[0018] Based on the volume of the liquid portion of the slurry, the chloride ion concentration is less than 20,000 ppm / L.

[0019] In a preferred embodiment of the anti-clogging method for the spray layer of the slurry circulation pump described in this invention: the process optimization steps include...

[0020] Adjusting the operation of the slurry circulation pump by modifying its operating mode can prevent slurry from washing away the nozzles of the stopped spray layer.

[0021] In a preferred embodiment of the anti-clogging method for the spray layer of the slurry circulation pump according to the present invention: the process optimization step further includes...

[0022] Optimize the nozzle installation layout to avoid having two nozzles facing each other in the vertical projection.

[0023] In a preferred embodiment of the anti-clogging method for the spray layer of the slurry circulation pump according to the present invention: the status monitoring step includes...

[0024] Real-time monitoring of slurry circulation pump outlet pressure;

[0025] When the outlet pressure of the slurry circulation pump is greater than 0.4 MPa, it is diagnosed that the nozzles of the spray layer are blocked.

[0026] When the outlet pressure of the slurry circulation pump is less than 0.2 MPa, it is diagnosed as a crack in the spray layer.

[0027] In a preferred embodiment of the anti-clogging method for the spray layer of the slurry circulation pump described in this invention: the maintenance and protection steps include...

[0028] Based on the diagnostic results fed back from the status monitoring steps, the damaged spray layer is repaired.

[0029] In a preferred embodiment of the anti-clogging method for the spray layer of the slurry circulation pump described in this invention: the maintenance and protection steps further include...

[0030] During the acceptance process, actual spray tests were conducted on each spray layer to ensure that the nozzles of each spray layer were operating normally.

[0031] The beneficial effects of this invention are as follows: by setting up four steps—source control, process optimization, status monitoring, and maintenance and protection—the clogging of the spray layer can be effectively reduced, thereby achieving the purpose of proactively preventing clogging, reducing downtime and maintenance caused by damage to the spray layer, thereby improving production efficiency, reducing production costs, reducing the workload of maintenance personnel, and reducing resource waste. Attached Figure Description

[0032] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments of the present invention will be briefly described below. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention. Wherein:

[0033] Figure 1 A schematic diagram showing the spray layer nozzles of the present invention arranged facing each other is shown;

[0034] Figure 2 A schematic diagram of the staggered arrangement of the spray layer nozzles of the present invention is shown. Detailed Implementation

[0035] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0036] The terminology used in this invention is that which is currently widely used in the art in consideration of the function of the invention; however, these terms may vary according to the intent of those skilled in the art, precedent, or new technology in the art. Furthermore, specific terms may be chosen by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the invention. Therefore, the terms used in this specification should not be construed as simple names, but rather based on their meanings and the overall description of the invention.

[0037] Reference Figure 1 and Figure 2 This embodiment provides a method for preventing clogging of the spray layer of a slurry circulation pump, including:

[0038] Source control steps: Control the quality of reclaimed water entering the desulfurization system and the quality of slurry in the absorption tower;

[0039] Process optimization steps: Optimize the operating logic of the spray layer and the spatial layout of the nozzles;

[0040] Status monitoring steps: Real-time monitoring of the slurry circulation pump outlet pressure;

[0041] Maintenance and protection steps: Repair the damaged spray layer and raise the acceptance standards during the acceptance period.

[0042] By setting up source control steps to reasonably control the quality of reclaimed water and slurry, it is possible to effectively prevent the spray layer from becoming clogged due to substandard quality of reclaimed water and slurry.

[0043] By setting process optimization steps, it is possible to prevent the nozzles from spraying slurry into the nozzles of the shutdown spray layer, which would cause the nozzles of the shutdown spray layer to become clogged.

[0044] By setting up status monitoring steps, the spray layer can be monitored in real time, problems can be quickly identified, and losses caused by damage to the spray layer can be reduced.

[0045] By setting up maintenance and protection procedures, the quality of the spray layer after maintenance can be effectively improved, and the occurrence of secondary damage can be reduced.

[0046] As one embodiment provided in this application, the source control steps include,

[0047] Reduce the solids and oil content of the reclaimed water entering the desulfurization system;

[0048] The pH value of the reclaimed water entering the desulfurization system should be controlled between 6 and 9, and the chloride ion content should be below 600 mg / L.

[0049] If the solids and oil content of the reclaimed water is too high, it will easily cause the spray layer to become clogged. By controlling the solids and oil content, the clogging caused by substandard reclaimed water quality can be effectively reduced.

[0050] If the pH value of the reclaimed water is lower than the specified standard, it will easily lead to corrosion of the spray layer pipes, resulting in pits. Solid particles can easily accumulate in these pits, causing blockages. Therefore, the pH value of the reclaimed water should be controlled to be greater than 6.

[0051] If the pH value of the reclaimed water is higher than the specified standard, when the reclaimed water enters the absorption tower as process water, it will cause a large number of fine calcium sulfite crystals to be generated in the slurry environment. These crystals are highly viscous and small in size, making it difficult to be effectively discharged through the gypsum dewatering system. As a result, they accumulate in the slurry and easily adhere to the inner wall of the nozzle, eventually leading to nozzle scaling and blockage. Therefore, the pH value of the reclaimed water should be controlled to be less than 9.

[0052] As one embodiment provided in this application, the source control step further includes,

[0053] The pH value of the slurry should be controlled between 5 and 6, and the density of the slurry should be 1060 kg / m³. 3 ~1140Kg / m 3 between;

[0054] Based on the total mass of the slurry, the solid content of the slurry is between 15% and 20%.

[0055] Based on the mass of solid substances, the solid substances contain CaCO3 < 3%, CaSO4·2H2O > 90%, CaSO3·1 / 2H2O < 1%, and SiO2 < 3%;

[0056] Based on the volume of the liquid portion of the slurry, the chloride ion concentration is less than 20,000 ppm / L.

[0057] Controlling CaCO3 < 3%, CaSO4·2H2O > 90%, CaSO3·1 / 2H2O < 1%, and SiO2 < 3% can effectively prevent solid particles from abrading the pipes and nozzles of the spray layer, thereby preventing the spray layer from breaking.

[0058] Furthermore, the chloride ion concentration should be controlled below 20,000 ppm / L. Chloride ions are highly acidic, and their accumulation directly leads to a decrease in the pH value of the slurry, creating an acidic corrosive environment. In this enhanced acidity, the absorption efficiency of sulfur dioxide decreases significantly, resulting in more sulfur dioxide remaining unabsorbed, further exacerbating the acidity of the slurry and creating a vicious cycle. Ultimately, the highly acidic environment will drastically accelerate the corrosion of metal components such as nozzles and pipes, producing a large amount of corrosion products (such as iron oxides). These insoluble corrosion product particles mixed in the slurry are highly prone to deposition and exacerbate nozzle clogging.

[0059] As one embodiment provided in this application, such as Figure 1 The process optimization steps include,

[0060] Adjusting the operation of the slurry circulation pump by modifying its operating mode can prevent slurry from washing away the nozzles of the stopped spray layer.

[0061] As attached Figure 1 As shown, when two nozzles are set up facing each other, and one nozzle is spraying while the other nozzle is not in operation, the operating nozzle will spray slurry into the non-operating nozzle. After the slurry solidifies, the non-operating nozzle is very prone to clogging.

[0062] Therefore, to prevent such incidents from occurring, the operation of the slurry circulation pump should be adjusted appropriately to avoid slurry scouring the nozzles of the stopped spray layer.

[0063] As one embodiment provided in this application, such as Figure 1 and Figure 2 The process optimization steps also include,

[0064] Optimize the nozzle installation layout to avoid having two nozzles facing each other in the vertical projection.

[0065] By optimizing the nozzle installation layout, the nozzle is positioned so that it is attached to the substrate. Figure 1 The position shown has been optimized to the attached Figure 2 The position shown directly avoids the situation where two nozzles are arranged directly opposite each other, thereby further reducing the possibility of operating nozzles spraying slurry into the interior of non-operating nozzles, and thus effectively preventing nozzle blockage.

[0066] It is worth noting that the nozzle installation layout can be adjusted in various ways depending on the actual arrangement, as long as the two nozzles are not directly opposite each other. Figure 2 The layout shown is for illustrative purposes only and should not be considered a limitation. Figure 2 The layout is shown.

[0067] As one embodiment provided in this application, the status monitoring step includes,

[0068] Real-time monitoring of slurry circulation pump outlet pressure;

[0069] When the outlet pressure of the slurry circulation pump is greater than 0.4 MPa, it is diagnosed that the nozzles of the spray layer are blocked.

[0070] When the outlet pressure of the slurry circulation pump is less than 0.2 MPa, it is diagnosed as a crack in the spray layer.

[0071] By monitoring the outlet pressure of the slurry circulation pump, the internal pressure of the spray layer can be known at any time.

[0072] When the outlet pressure of the slurry circulation pump is too high, it can be determined that the nozzle is blocked, and the slurry cannot be effectively discharged, resulting in increased pressure.

[0073] When the outlet pressure of the slurry circulation pump is too low, it can be determined that the pipe or nozzle is broken, and the slurry is quickly discharged from the crack, resulting in a decrease in pressure.

[0074] Therefore, staff only need to monitor the outlet pressure of the slurry circulation pump to know the operating status of the spray layer, so that staff can discover problems in time, report them in time, and make reasonable plans for downtime maintenance.

[0075] As one embodiment provided in this application, the maintenance and protection steps include,

[0076] Based on the diagnostic results fed back from the status monitoring steps, the damaged spray layer is repaired.

[0077] During the acceptance process, actual spray tests were conducted on each spray layer to ensure that the nozzles of each spray layer were operating normally.

[0078] Based on the diagnostic results fed back from the status monitoring steps, staff can quickly understand the damage to the spray layer and reasonably arrange downtime to facilitate repairs to the damaged areas.

[0079] After maintenance is completed, the acceptance standards should be raised, namely, a thorough inspection of the maintenance work and a live spray test. The actual spray test results should be used to determine whether the maintenance is qualified, thereby ensuring that the spray layer can work normally after maintenance.

[0080] In summary, by setting up four steps—source control, process optimization, status monitoring, and maintenance and support—the clogging of the spray layer can be effectively reduced, thereby achieving the goal of proactively preventing clogging, reducing downtime for maintenance due to damage to the spray layer, and thus improving production efficiency, reducing production costs, reducing the workload of maintenance personnel, and reducing resource waste.

[0081] Finally, it should be noted that the methods and devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways as long as they do not depart from the scope of the present invention.

Claims

1. A method for preventing clogging of the spray layer of a slurry circulation pump, characterized in that: include, Source control steps: Control the quality of reclaimed water entering the desulfurization system and the quality of slurry in the absorption tower; Process optimization steps: Optimize the operating logic of the spray layer and the spatial layout of the nozzles; Status monitoring steps: Real-time monitoring of the slurry circulation pump outlet pressure; Maintenance and protection steps: Repair the damaged spray layer and raise the acceptance standards during the acceptance period.

2. The method for preventing clogging of the spray layer of the slurry circulation pump according to claim 1, characterized in that: The source control steps include: Reduce the solids and oil content of the reclaimed water entering the desulfurization system; The pH value of the reclaimed water entering the desulfurization system should be controlled between 6 and 9, and the chloride ion content should be below 600 mg / L.

3. The method for preventing clogging of the spray layer of the slurry circulation pump according to claim 2, characterized in that: The source control steps also include The pH value of the slurry should be controlled between 5 and 6, and the density of the slurry should be 1060 kg / m³. 3 ~1140Kg / m 3 between; Based on the total mass of the slurry, the solid content of the slurry is between 15% and 20%. Based on the mass of solid substances, the solid substances contain CaCO3 < 3%, CaSO4·2H2O > 90%, CaSO3·1 / 2H2O < 1%, and SiO2 < 3%; Based on the volume of the liquid portion of the slurry, the chloride ion concentration is less than 20,000 ppm / L.

4. The method for preventing clogging of the spray layer of the slurry circulation pump according to claim 3, characterized in that: The process optimization steps include: Adjusting the operation of the slurry circulation pump by modifying its operating mode can prevent slurry from washing away the nozzles of the stopped spray layer.

5. The method for preventing clogging of the spray layer of the slurry circulation pump according to claim 4, characterized in that: The process optimization steps also include, Optimize the nozzle installation layout to avoid having two nozzles facing each other in the vertical projection.

6. The method for preventing clogging of the spray layer of the slurry circulation pump according to claim 5, characterized in that: The status monitoring steps include, Real-time monitoring of slurry circulation pump outlet pressure; When the outlet pressure of the slurry circulation pump is greater than 0.4 MPa, it is diagnosed that the nozzles of the spray layer are blocked. When the outlet pressure of the slurry circulation pump is less than 0.2 MPa, it is diagnosed as a crack in the spray layer.

7. The method for preventing clogging of the spray layer of the slurry circulation pump according to claim 6, characterized in that: The maintenance and protection steps include, Based on the diagnostic results fed back from the status monitoring steps, the damaged spray layer is repaired.

8. The method for preventing clogging of the spray layer of the slurry circulation pump according to claim 7, characterized in that: The maintenance and protection steps also include, During the acceptance process, actual spray tests were conducted on each spray layer to ensure that the nozzles of each spray layer were operating normally.

Images