A method for reducing the length of a slurry tail in a pipeline

Abstract

The application discloses an operating method for reducing the length of slurry tail in pipeline transportation, and aims at the phenomenon that the arrival delay time of slurry tail is relatively long in the process of slurry tail pipeline transportation, the long-time transportation leads to the lengthening of the running time of production equipment, the increase of production cost and the increase of production energy consumption, the long-time transportation of slurry tail with low concentration increases the abrasion of the pipeline, and is not conducive to the safety production, the transportation flow after water cutting is increased to reduce the diffusion, the transportation time of slurry tail is greatly reduced, the production energy consumption and the production cost are reduced, a larger space is provided for production adjustment and promotion, the method plays an important role in creating a green, pollution-free, energy-saving and low-carbon economic enterprise, the operation is simple and the effect is obvious, the method is favorable for popularization and use, the running coefficient of long-period safe operation of the pipeline is improved, the development of the key technology of solid-liquid two-phase transportation of solid materials in long-distance slurry pipeline complex terrain is promoted, and the method plays a positive role in promoting scientific and technological innovation.

Description

Technical Field

[0001] This invention relates to the field of pipeline transportation technology, and specifically to an operation method for reducing the tail time of slurry during pipeline transportation. Background Technology

[0002] During the pipeline transport of slurry tailings, there are situations where the slurry stored at the starting station is insufficient for pipeline output, or where production adjustments require switching to water-push slurry. Water is pumped to push out the remaining slurry in the pipeline before normal standby can resume. During transport, it was found that when water-push slurry is used from the upstream pumping station to the downstream pumping station, the slurry tailings experience a significant delay in reaching the downstream pumping station (delay time = actual arrival time of slurry tailings - theoretical arrival time). This delay leads to longer operating times for production equipment, lower slurry tailings concentration in the pipeline, increased energy consumption, and even increased wear on the pipeline due to the lower concentration of slurry. Summary of the Invention

[0003] The purpose of this invention is to address the problem of excessive delay in the arrival time of slurry tails during pipeline transportation. This prolonged transportation leads to longer operating times for production equipment, increasing production costs and energy consumption. Furthermore, prolonged transportation of slurry tails with reduced concentration increases wear on pipelines, jeopardizing safe production. This invention provides a method to reduce the duration of slurry tail transportation by increasing the flow rate after water cut-off to reduce diffusion, thereby significantly reducing slurry tail transportation time. This reduces production energy consumption and costs, and also provides greater flexibility for production adjustments. It plays a crucial role in creating a green, environmentally friendly, pollution-free, energy-saving, and low-carbon economic enterprise.

[0004] The technical solution of the present invention is as follows:

[0005] A method for reducing the tail time of slurry delivery in pipelines includes the following steps:

[0006] After the upstream pumping station cuts off water and pushes grout, the main pipeline flow rate is increased according to the station outlet pressure. During this period, the total station outlet pressure does not exceed the pipeline's safe operating pressure.

[0007] As the water-driven grouting time increases, the outlet pressure of the starting station decreases. Based on the real-time pressure, the main pipeline flow rate of the starting station is increased, and the total outlet pressure is not higher than the pipeline safety pressure. At the same time, the main pump does not operate at excessively high speed.

[0008] Furthermore, increasing the main pipeline flow rate includes adjusting the pump station parameters, with the adjusted parameters being: flow rate 240-250 m³ / h. 3 / h, pump speed 68%~70%, outlet pressure after water cut-off 17000kPa.

[0009] Furthermore, the parameters of the pumping station before adjustment were: flow rate 218-220 m³ / h. 3 / h, pump speed 60%~62%, outlet pressure after water cut-off 15000kPa.

[0010] Furthermore, the pumping speed of the pumping station before the adjustment was 62%, and the pumping speed of the pumping station after the adjustment was 80%.

[0011] Furthermore, the main pump shall not operate under excessively high-speed loads; the pump speed of the main pump shall not exceed 90%.

[0012] Furthermore, the pipeline distance from the upstream pumping station to the downstream pumping station is 12.5 km, and the pipe diameter is 244.5 mm.

[0013] Furthermore, the elevation of the upstream pumping station is 670m, and the elevation of the downstream pumping station is 1435.5m.

[0014] Compared with existing technologies, the advantages of this invention are:

[0015] 1. An operation method for reducing the tail time of slurry transportation in pipelines, which reduces diffusion by increasing the transportation flow rate after water cutting, greatly reduces the tail time of slurry transportation, thereby reducing production energy consumption and production costs, and also provides greater room for production adjustment. It plays an important role in creating a green, environmentally friendly, pollution-free, energy-saving, and low-carbon economic enterprise.

[0016] 2. An operation method for reducing the tail time of slurry transportation in pipelines is simple to operate and has obvious effects, which is conducive to its widespread use and improves the operation coefficient of "long-term safe operation of pipelines". It promotes the development of key technologies for solid-liquid two-phase transportation of solid materials in complex terrains of long-distance slurry pipelines and plays a positive role in promoting scientific and technological innovation. Attached Figure Description

[0017] Figure 1 A pump speed curve of an existing upstream pumping station for an operational method to reduce the tail time of slurry delivery in pipelines.

[0018] Figure 2 The inlet pressure curve of an existing downstream pumping station is shown as an operational method to reduce the tail time of slurry delivery through pipelines.

[0019] Figure 3 This is a pump speed curve after lifting water to push slurry, which is an operation method to reduce the tail time of slurry delivery in pipelines.

[0020] Figure 4 The diagram shows the inlet pressure curve of the downstream pumping station after adjustment, which is an operational method to reduce the tail time of slurry delivery in pipelines. Detailed Implementation

[0021] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0022] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0023] Please see Figure 1-4 A method for reducing the tail time of slurry delivery in pipelines includes the following steps:

[0024] After the upstream pumping station cuts off water and pushes grout, the main pipeline flow rate is increased according to the station outlet pressure. During this period, the total station outlet pressure does not exceed the pipeline's safe operating pressure.

[0025] As the water-driven grouting time increases, the outlet pressure of the starting station decreases. Based on the real-time pressure, the main pipeline flow rate of the starting station is increased, and the total outlet pressure is not higher than the pipeline safety pressure. At the same time, the main pump does not operate at excessively high speed.

[0026] Increasing the main pipeline flow rate involves adjusting the pump station parameters. The adjusted parameters are: flow rate 240-250 m³ / h. 3 / h, pump speed 68%~70%, outlet pressure after water cut-off 17000kPa.

[0027] The pump station's parameters before adjustment were: flow rate 218-220 m³ / h. 3 / h, pump speed 60%~62%, outlet pressure after water cut-off 15000kPa.

[0028] The pumping speed of the pumping station before the adjustment was 62%, and the pumping speed of the pumping station after the adjustment was 80%.

[0029] The main pump should not be operated under excessively high-speed loads; the pump speed should not exceed 90%.

[0030] The pipeline distance between the upstream and downstream pumping stations is 12.5 km, with a pipe diameter of 244.5 mm. The upstream pumping station is at an altitude of 670 m, and the downstream pumping station is at an altitude of 1435.5 m.

[0031] In another specific embodiment, after consulting relevant materials and analyzing the actual situation, it was confirmed that the main factor affecting the tailing time of the slurry was the short pipeline distance and large altitude difference between the two stations, which accelerated the diffusion of the slurry under the influence of gravitational potential energy. Although the diffusion of the slurry is unavoidable, the diffusion rate can be reduced by increasing the conveying pressure at the front end of the pipeline. From an operational perspective, diffusion can be reduced by increasing the conveying flow rate after water cutting.

[0032] Based on the above analysis and the basic principles of reducing diffusion, the following specific operational methods for reducing diffusion are proposed:

[0033] After the upstream pumping station cuts off water and pushes grout, the main pipeline flow rate (i.e., pump speed) should be appropriately increased according to the station outlet pressure. During this period, the total outlet pressure of the station shall not exceed the pipeline operating safety pressure.

[0034] As the water-driven grouting time increases, the outlet pressure of the starting station will decrease. Based on the real-time pressure, the main pipeline flow rate of the starting station should be increased, but its total outlet pressure must not exceed the pipeline's safe pressure. Simultaneously, care must be taken to ensure that the main pump does not operate at excessively high speed (not exceeding 90% pump speed). This is compared to the original flow rate of 218–220 m³ / h. 3 The parameters were adjusted to a flow rate of 240-250 m³ / h, pump speed of 60%-62%, and outlet pressure of approximately 15000 kPa after water cut-off (gradually decreasing with pumping time). 3 The pump speed is 68%–70% of its rated capacity, and the outlet pressure after water cut-off is approximately 17000 kPa (gradually decreasing with pumping time). The adjusted pump speed curve after lifting water and slurry pushing is shown below. Figure 3 As shown. Among them, Figure 3 Two pumps were in operation at 80% capacity. After the adjustment, the tailing time of the slurry was greatly shortened, reducing energy consumption and improving conveying efficiency.

[0035] The adjusted inlet pressure of the downstream pumping station is as follows: Figure 4 As shown. Comparison Figure 2 and Figure 4 It can be observed that, compared to the previous operating parameters, the adjusted tail conveying time has been shortened by nearly 4 hours.

[0036] On June 4, 2020, the upstream pumping station reduced its operating time by 4 hours, consuming approximately 4080 kWh of electricity; the downstream pumping station reduced its operating time by 4 hours, consuming approximately 4320 kWh of electricity. With an average of 4 water-driven slurry operations per month, excluding the energy consumption factor due to increased pump speed, a total of 29600 kWh of electricity was saved monthly, resulting in an annual cumulative saving of 355200 kWh, totaling 170,000 yuan in electricity costs. The above figures are direct benefits derived from actual production statistics and do not yet include savings from wear and tear on main and auxiliary equipment, pipeline wear, and auxiliary system losses.

[0037] The practical application of this method has proven that it can greatly reduce tailings conveying time, thereby reducing production energy consumption and production costs, and also provides greater room for production adjustments. It plays an important role in creating a green, environmentally friendly, pollution-free, energy-saving, and low-carbon economic enterprise.

[0038] Meanwhile, this method is simple to operate and has obvious effects, which is conducive to its widespread use. It also improves the operating coefficient of "long-term safe operation of pipelines", promotes the development of key technologies for solid-liquid two-phase transportation of solid materials in complex terrain of long-distance slurry pipelines, and plays a positive role in promoting scientific and technological innovation.

[0039] The embodiments described above merely illustrate specific implementation methods of this application, and while the descriptions are detailed and specific, they should not be construed as limiting the scope of protection of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the technical solution of this application, and these modifications and improvements all fall within the scope of protection of this application.

Claims

1. A method for reducing the tailing time of slurry delivery in pipelines, characterized in that, Includes the following steps: After the upstream pumping station cuts off water and pushes grout, the main pipeline flow rate is increased according to the station outlet pressure. During this period, the total station outlet pressure does not exceed the pipeline's safe operating pressure. As the water-driven grouting time increases, the outlet pressure of the starting station decreases. Based on the real-time pressure, the main pipeline flow rate of the starting station is increased, and the total outlet pressure is not higher than the pipeline safety pressure. At the same time, the main pump does not operate at excessively high speed load. Increasing the main pipeline flow rate involves adjusting the pump station parameters. The adjusted parameters are: flow rate 240-250 m³ / h. 3 / h, pump speed 68%~70%, outlet pressure after water cut-off 17000kPa; The pump station's parameters before adjustment were: flow rate 218-220 m³ / h. 3 / h, pump speed 60%~62%, outlet pressure after water cut-off 15000kPa.

2. The method for reducing the tail time of slurry delivery in pipelines according to claim 1, characterized in that, The pumping speed of the pumping station before the adjustment was 62%, and the pumping speed of the pumping station after the adjustment was 80%.

3. The method for reducing the tail time of slurry delivery in pipelines according to claim 1, characterized in that, The main pump shall not operate under excessively high-speed loads; the pump speed shall not exceed 90%.

4. The method for reducing the tail time of slurry delivery in pipelines according to claim 1, characterized in that, The pipeline distance between the upstream pumping station and the downstream pumping station is 12.5 km, and the pipe diameter is 244.5 mm.

5. The method for reducing the tail time of slurry delivery in pipelines according to claim 4, characterized in that, The upstream pumping station is at an altitude of 670m, and the downstream pumping station is at an altitude of 1435.5m.

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