Cleaning system of conveying pipeline

Abstract

The utility model discloses a cleaning system of a conveying pipeline, which belongs to the technical field of pipeline cleaning and comprises a separating tank, a steam header pipe, the conveying pipeline and a middle-section steam pipe, and a discharge valve, a pressure regulating valve and a feeding valve are sequentially arranged on the conveying pipeline from front to back. The steam main pipe is connected with the middle-section steam pipe, the front-end steam pipe and the tail-end steam valve through the four-way joint, an outlet of the middle-section steam pipe is connected to an outlet of the conveying pump, and the front-end steam valve is connected to an outlet of the feeding valve. Therefore, forward scaling of the conveying pipeline can be smoothly blown and dissolved, reverse blowing can also be carried out, the scaling in the pipeline and equipment can be reversely flushed and kept smooth, the scaling in the conveying pipeline and the equipment can be blown and discharged along a discharge valve, the purpose of rapidly cleaning the pipeline is achieved, blowing is carried out in multiple directions and multiple dimensions, and no dead angle exists in cleaning.

Description

Technical Field

[0001] This utility model relates to the field of pipeline cleaning technology, and in particular to a cleaning system for conveying pipelines. Background Technology

[0002] The polymer utilizes the Gemma recovery process, which includes: an extraction water storage tank, triple-effect evaporation, oligomer separation, depolymerization, pre-dehydration, distillation, and a caprolactam storage tank, performed sequentially. The oligomer separation process employs negative pressure and high temperature to separate most of the volatile caprolactam and water from other impurities in the extraction water, yielding clean caprolactam and water vapor, which enters the pre-dehydration section through the top. The less volatile oligomers remain at the bottom of the separation tower and are pumped to the depolymerization reactor for subsequent chemical decomposition.

[0003] During the transport of oligomers to the depolymerization reactor, their inherent tendency to solidify leads to scaling and pipe blockage. Currently, the pipeline is periodically purged with steam to maintain flow. However, to keep valves clear, purging is typically done only at the drain valves (right-to-back) to remove scale and keep the pipeline flowing. Since filters and pumps are usually disassembled and cleaned periodically, they are not purged along with the pipeline, which actually makes the equipment more prone to blockage, requiring more frequent disassembly and cleaning. Furthermore, the complex pipeline structure, including right-angle pipes, joints, and sharp-angled pipes designed to reduce reverse flow, makes it difficult to clean the bends, especially sharp angles exceeding 90°, which often become clogged with scale, necessitating shutdown and pipe disassembly for cleaning.

[0004] The aforementioned reasons all contribute to time-consuming and labor-intensive pipeline cleaning, increasing costs and affecting the continuity and stability of recycling production. It frequently necessitates halting production on the transport pipelines to clean oligomer scale buildup, thus adversely impacting production.

[0005] Based on this, the present invention designs a cleaning system for conveying pipelines to solve the above problems. Utility Model Content

[0006] The purpose of this utility model is to provide a cleaning system for conveying pipelines. This pipeline cleaning system can intervene at multiple nodes of the original conveying pipeline and can use steam to purge along the pipeline, thereby successfully blowing away and dissolving the scale in the forward direction of the conveying pipeline. It can also purge in reverse to flush away the scale in the pipeline and equipment, keeping them unobstructed. Furthermore, it can purge and discharge the scale in the conveying pipeline and equipment along the discharge valve in the direction of oligomer flow, achieving the purpose of quickly cleaning the pipeline. Moreover, it can purge in multiple directions and dimensions, cleaning without dead corners.

[0007] This utility model is implemented as follows: a cleaning system for a conveying pipeline, comprising:

[0008] Separation tank, main steam pipe, delivery pipeline and intermediate steam pipe;

[0009] The separation tank is an oligomer separation container. A feed valve is installed at the discharge port at the bottom of the separation tank. A filter is installed at the rear end of the separation tank, and a delivery pump is connected to the rear end of the filter.

[0010] The conveying pipeline is equipped with a discharge valve, a pressure regulating valve and a feeding valve in sequence from front to back, and the front end of the conveying pipeline is connected to the discharge port of the conveying pump.

[0011] The main steam pipe is a closed pipe carrying high-pressure steam. A main steam valve is installed on the main steam pipe. The main steam valve is connected to the middle section steam pipe, the front end steam pipe and the tail end steam valve through a four-way valve. The tail end steam valve is connected to the pressure regulating valve and the feeding valve through a three-way valve.

[0012] A mid-section steam valve is installed on the mid-section steam pipe, and the rear end of the mid-section steam pipe is connected to the pipeline between the delivery pipeline and the delivery pump via a tee.

[0013] A front steam valve is also installed on the front steam pipe, and the rear end of the front steam pipe is connected between the feed valve and the filter via a tee.

[0014] Furthermore, the intermediate steam valve is located at the rear end of the intermediate steam pipe, and the outlet of the intermediate steam valve is connected to the outlet of the delivery pump via a tee.

[0015] The internal steam pressure of the main steam pipe, the middle section steam pipe and the front steam pipe is 1 MPa, and the main steam pipe, the middle section steam pipe and the front steam pipe are all wrapped with heat insulation sleeves.

[0016] Furthermore, the front-end steam valve is located at the rear end of the front-end steam pipe, and the front-end steam valve is connected to the outlet of the feed valve via a tee.

[0017] Furthermore, the front section of the conveying pipeline is an inclined pipe with a higher front and a lower rear, and the discharge valve is inclinedly connected to the inclined pipe at the front section of the conveying pipeline, with the front end of the discharge valve higher than the outlet end.

[0018] Furthermore, the pressure regulating valve is an electric valve, and the feed valve and the delivery valve are manual regulating valves.

[0019] Furthermore, a slag discharge port is provided at the bottom of the filter.

[0020] The beneficial effects of this utility model are: 1. This utility model cleans the pipeline between the separation tank and the filter through the front steam pipe, and also blows and cleans the filter, effectively cleaning the scale on the filter element, and also cleaning the scale in the delivery pump, with good cleaning effect.

[0021] 2. This device also adds a middle section steam pipe, which is used to purge the front end of the conveying pipeline in the forward direction, and at the same time purge the filter and conveying pump in the reverse direction, so that the blades and filter screens that cannot be purgeed in the forward direction can be cleaned in the reverse direction, and the bidirectional cleaning effect is better.

[0022] 3. The steam from the reverse-blowing pressure regulating valve is controlled by the tail-end steam valve, and the conveying pipeline is cleaned in reverse. The conveying pipeline can also be purged in the forward direction by the middle-section steam valve, and the dirt is discharged by the discharge valve. Moreover, the outlet end of the discharge valve is set downward, which can effectively drain the dirt along the pipeline, resulting in a good cleaning effect. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] Figure 1 This is a schematic diagram of the overall pipeline connection relationship of this utility model.

[0025] The attached diagram lists the components represented by each number as follows:

[0026] 1-Separation tank, 11-Filter, 12-Transfer pump, 13-Feed valve, 2-Steam main pipe, 21-Steam main valve, 22-Tail steam valve, 3-Transfer pipeline, 31-Pressure regulating valve, 32-Feed valve, 33-Discharge valve, 4-Intermediate steam pipe, 41-Front end steam pipe, 42-Intermediate steam valve, 43-Front end steam valve. Detailed Implementation

[0027] Please see Figure 1 As shown, this utility model provides a cleaning system for a conveying pipeline. To better understand the above technical solution, the following will describe the above technical solution in detail with reference to the accompanying drawings and specific embodiments.

[0028] In a specific embodiment of the technical solution of this utility model:

[0029] It includes a separation tank 1, a main steam pipe 2, a conveying pipeline 3, and a middle section steam pipe 4;

[0030] Separation tank 1 is an oligomer separation container. A feed valve 13 is installed at the bottom outlet of separation tank 1, and a front steam valve 43 is installed at the rear end of the front steam pipe 41. A front steam valve 43 is also installed on the front steam pipe 41, and the rear end of the front steam pipe 41 is connected between the feed valve 13 and the filter 11 via a tee. The front steam valve 43 is connected close to the outlet of the feed valve 13.

[0031] A filter 11 is installed at the rear end of the separation tank 1. A slag discharge port is installed at the bottom of the filter 11. The slag discharge port can discharge the dirt that is blown off by steam, reducing the dirt residue in the filter 11. It can also discharge the dirt on the pipeline at the rear end of the feed valve 13 along with the slag discharge port of the filter 11. There is no need to install other sewage discharge devices and pipes, reducing the amount of cleaning work. The filter 11 can be cleaned by opening the front steam valve 43.

[0032] The filter 11 is connected to the delivery pump 12 at the rear end; the high-temperature and high-pressure steam blown out by the front steam valve 43 can also clean the delivery pump 12, ensuring that the scale on the front blades of the pump body can be cleaned by front-side blowing. At the same time, the delivery pump 12 can be purged in reverse through the middle steam valve 42, and the scale on the back of the blades can also be cleaned by back-side flushing from the discharge port of the delivery pump 12.

[0033] The conveying pipeline 3 is equipped with a discharge valve 33, a pressure regulating valve 31 and a feeding valve 32 in sequence from front to back. The front end of the conveying pipeline 3 is connected to the discharge port of the conveying pump 12, and the rear end of the conveying pipeline 3 is connected to the external depolymerization reactor.

[0034] The front section of the conveying pipeline 3 is inclined, with the front higher than the rear. The discharge valve 33 is inclinedly connected to the inclined front section of the conveying pipeline 3, and the front end of the discharge valve 33 is higher than the outlet end. Through the inclined front section of the conveying pipeline 3, the scale in the rear section of the conveying pipeline 3 is discharged. At the same time, through high-pressure steam purging and when other valves are closed, light scale can also be discharged through the discharge valve 33. Moreover, the inclined setting of the discharge valve 33 makes the discharge more convenient and smooth.

[0035] The steam main pipe 2 is a closed pipe with high-pressure steam. A steam main valve 21 is installed on the steam main pipe 2. The steam main valve 21 is connected to the middle section steam pipe 4, the front end steam pipe 41 and the tail end steam valve 22 through a four-way valve. The tail end steam valve 22 is connected to the pressure regulating valve 31 and the feeding valve 32 through a three-way valve.

[0036] A mid-section steam valve 42 is installed on the mid-section steam pipe 4. The rear end of the mid-section steam pipe 4 is connected to the pipeline between the delivery pipeline 3 and the delivery pump 12 via a tee. The mid-section steam valve 42 is located at the rear end of the mid-section steam pipe 4, and the outlet of the mid-section steam valve 42 is connected to the outlet of the delivery pump 12 via a tee.

[0037] The internal steam pressure of the main steam pipe 2, the intermediate steam pipe 4, and the front steam pipe 41 is 1 MPa. The main steam pipe 2, the intermediate steam pipe 4, and the front steam pipe 41 are all wrapped with insulation sleeves to keep the steam warm, thereby allowing for high-temperature purging of the delivery pipeline 3.

[0038] Pressure regulating valve 31 is an electric valve, and feed valve 13 is an electric manual valve, which can conveniently adjust the flow rate of the output, which is more beneficial to production. The main cleaning target of the conveying pipeline 3 during flushing is pressure regulating valve 31. Feed valve 32 is a manual regulating valve, and the other valves are also manual regulating valves, which can conveniently control the opening degree. They are manually adjusted only when the pipeline is cleaned. During normal production, the manual valves are in a fixed state, which is convenient for adjustment and production. The manual valves do not require additional control during long-term production and are easy to operate.

[0039] In use, this utility model controls the inflow of steam through the main steam pipe 2 and the main steam valve 21, and controls the flow direction of steam through the intermediate steam valve 42 and the front steam valve 43, so as to achieve the purpose of purging different pipelines and equipment in production.

[0040] The rear end of the intermediate steam pipe 4 is connected to the outlet of the delivery pump 12 through the intermediate steam valve 42, which can both blow the front end of the delivery pipeline 3 in the forward direction and blow the delivery pump 3 in the reverse direction.

[0041] The front steam pipe 41 and the front steam valve 43 can blow air onto the equipment and pipelines behind the feed valve 13, thereby using high-temperature steam to clean the filter 11 and its front pipelines, achieving a cleaning effect. When the slag discharge port of the filter 11 is closed, pressure can also be stored in the filter 11 to perform forward blowing on the conveying pump 12.

[0042] When the feed valve 32 can be closed by the tail steam valve 22, the pressure regulating valve 31 is reverse-blown to discharge the dirt in the conveying pipeline 3 along the discharge valve 33. The feed valve 32 can also be opened and the pressure regulating valve 31 can be closed to flush the subsequent process pipeline. Since the pipeline is flushed with water vapor, it will not affect the cleanliness of the caprolactam oligomer and can also dilute the oligomer concentration, making it easier to transport and use. The whole cleaning process is fast and can be cleaned within 20 minutes. The entire conveying system can then be used normally, effectively preventing pipeline blockage.

[0043] The normal transport direction of the oligomers is indicated by the arrow on the solid line, while the direction of water vapor flow rinsing is indicated by the arrow on the dashed line.

[0044] Furthermore, in the description of this utility model, the front end refers to the front-to-back direction of the material and water vapor flow, the initial position is the front end, and the exit position of the fluid flow is the rear end. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing this utility model and simplifying the description, and does not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.

[0045] While specific embodiments of the present invention have been described above, those skilled in the art should understand that the specific embodiments described are merely illustrative and not intended to limit the scope of the present invention. Equivalent modifications and variations made by those skilled in the art in accordance with the spirit of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A cleaning system for a delivery conduit, characterized by, The utility model relates to a kind of steam feeding systems, including: Separation tank (1), steam main pipe (2), conveying pipeline (3) and middle section steam pipe (4); The separation tank (1) is oligomer separation container, feed valve (13) is provided on the bottom discharge port of the separation tank (1), filter (11) is provided at the rear end of the separation tank (1), conveying pump (12) is connected at the rear end of the filter (11); Discharge valve (33), pressure regulating valve (31) and feeding valve (32) are sequentially provided on the conveying pipeline (3) from front to back, the front end of the conveying pipeline (3) is connected with the discharge port of the conveying pump (12); The steam main pipe (2) is closed pipeline with high-pressure water vapor, steam main valve (21) is provided on the steam main pipe (2), the steam main valve (21) is connected with middle section steam pipe (4), front end steam pipe (41) and tail end steam valve (22) through four-way respectively, the tail end steam valve (22) is communicated with pressure regulating valve (31) and feeding valve (32) through three-way; Middle section steam valve (42) is provided on the middle section steam pipe (4), the rear end of the middle section steam pipe (4) is connected on the pipeline between conveying pipeline (3) and conveying pump (12) through three-way; Front end steam valve (43) is further provided on the front end steam pipe (41), the rear end of the front end steam pipe (41) is connected between feed valve (13) and filter (11) through three-way.

2. A cleaning system for a delivery conduit as claimed in claim 1, wherein: The middle section steam valve (42) is provided at the rear end of the middle section steam pipe (4), the outlet of the middle section steam valve (42) is connected at the outlet of the conveying pump (12) through three-way; The internal water vapor pressure of the steam main pipe (2), middle section steam pipe (4) and front end steam pipe (41) is 1MPa, the steam main pipe (2), middle section steam pipe (4) and front end steam pipe (41) are all wrapped with heat preservation sleeve.

3. A cleaning system for a delivery conduit as claimed in claim 1, wherein: The front end steam valve (43) is provided at the rear end of the front end steam pipe (41), the front end steam valve (43) is connected at the outlet of the feed valve (13) through three-way.

4. A cleaning system for a delivery conduit as defined in claim 1, wherein: The front section of the conveying pipeline (3) is inclined pipeline with high front and low back, the discharge valve (33) is connected on the inclined pipeline of the front section of the conveying pipeline (3), and the front end of the discharge valve (33) is higher than the outlet end.

5. A cleaning system for a delivery conduit as defined in claim 1, wherein: The pressure regulating valve (31) is electric valve, the feed valve (13) and feeding valve (32) are manual regulating valve.

6. A cleaning system for a delivery conduit as defined in claim 1, wherein: The filter (11) is provided with slag discharge port at the bottom.

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