Ring pipe device for cleaning sediments in water system

Abstract

The utility model relates to an annular pipe device for cleaning sediments in a water system. The annular pipe device comprises a high-pressure flash tower, a riser and a remote control device, a gas rising pipe penetrates through the middle of the partition plate and is arranged in the middle of the high-pressure flash tower; a shielding part is arranged at the upper part of the riser; a high-temperature and high-pressure black water inlet is formed in the middle of the high-pressure flash tower, an evaporation chamber water outlet is formed in the bottommost part of the high-pressure flash tower, and a tower tray is arranged at the upper part of the high-pressure flash tower; a low-temperature process water inlet is formed above a tray at the upper part of the high-pressure flash tower; a gas phase outlet is formed in the top of the high-pressure flash tower; an annular pipe pollution discharge module is arranged at the bottom of the partition plate; the annular pipe pollution discharge module comprises an annular pipe, and a first pipeline, a second pipeline and a third pipeline which are connected with the annular pipe; N holes are formed in the annular pipe at fixed intervals; a first valve is arranged between the first pipeline and the second pipeline; and a second valve is arranged between the second pipeline and the third pipeline.

Description

Technical Field

[0001] This utility model belongs to the technical field of high-pressure flash evaporation towers and relates to a loop pipe device for cleaning sediments in water systems. Background Technology

[0002] Large-scale fluidized bed gasification, as the most effective clean coal technology for improving coal utilization, is the most widely constructed coal gasification process unit in my country in recent years. The coal-water slurry gasification process uses pure oxygen and coal-water slurry as raw materials, employing a fluidized bed reactor to conduct a partial oxidation reaction under pressurized, non-catalytic conditions, generating coal-water gas with CO and H2 as active components. The high-temperature coal-water gas carries a large amount of coal dust and fine ash, which undergoes three-stage washing and dust removal (gasifier, washing tower, cyclone separator). This coal dust and fine ash are washed off by quench water to form gasification black water. The high-temperature black water is then cooled through three-stage flash evaporation (high-pressure flash tower, low-pressure flash tank, vacuum flash tank), concentrating the ash and dust. The flash-evaporated black water is sent to a settling tank, where the ash and dust flocculate and settle. The clarified ash water flows through the overflow weir of the settling tank into an ash water tank, and is then returned to the system for reuse via a low-pressure ash water pump.

[0003] The flash evaporation process of gasified black water: The gasified black water from the gasifier, washing tower, and cyclone separator is depressurized and then enters the high-pressure flash evaporation tower. Evaporation and separation are completed in the lower evaporation chamber, and heat exchange, recovery, and reuse are completed in the upper hot water chamber. The ash water in the hot water chamber contains about 0.1-0.5% suspended solids (fine ash). Fine ash easily accumulates at the bottom of the hot water chamber, and over time, it easily settles and forms scale. After the scale falls off, it blocks the hot water chamber outlet, outlet pipes, and conveying equipment. In severe cases, it can cause system shutdown and have a significant impact on production.

[0004] The ash accumulated at the bottom of the hot water chamber during normal production was left untreated and allowed to accumulate, eventually being carried by the water flow to downstream pipes and equipment when it reached the hot water chamber outlet. Currently, there is no equipment or method in the industry for online cleaning of fine ash at the bottom of the hot water chamber of a high-pressure flash evaporator; manual cleaning is the only option after the system is shut down. Utility Model Content

[0005] To address the problem of ash and slag accumulation in the upper hot water chamber of a high-pressure flash evaporator, and to prevent process water from carrying ash, ash blocks, and scale, which could cause blockages in downstream equipment, insufficient pump suction, frequent pump malfunctions, or even system shutdowns, the technical solution adopted in this utility model is: a loop pipe device for cleaning sediment in a water system, comprising a high-pressure flash evaporator and a riser pipe.

[0006] A partition is installed in the middle of the high-pressure flash tower. The upper part of the partition is divided into a hot water chamber, and the lower part of the partition is an evaporation chamber.

[0007] The gas riser pipe passes through the middle of the partition and is located in the middle of the high-pressure flash tower;

[0008] A shielding part is provided at the upper part of the riser pipe;

[0009] A high-temperature, high-pressure black water inlet is located in the middle of the high-pressure flash evaporation tower.

[0010] An evaporation chamber outlet is located at the bottom of the high-pressure flash evaporator.

[0011] A tray is provided at the top of the high-pressure flash tower;

[0012] A low-temperature process water inlet is provided above the tray at the top of the high-pressure flash evaporator;

[0013] A gas phase outlet is provided at the top of the high-pressure flash evaporator;

[0014] A ring-shaped sewage discharge module is provided at the bottom of the partition.

[0015] The ring pipe sewage module includes a ring pipe, a first pipe, a second pipe, and a third pipe connected to the ring pipe, and N holes are provided on the ring pipe at fixed intervals.

[0016] A first valve is installed between the first pipe and the second pipe;

[0017] A second valve is installed between the second and third pipes;

[0018] The other end of the third pipe is connected to the sewage tank;

[0019] The remote control device is connected to the second valve.

[0020] The remote control device used is Centum vp 6.0.5.

[0021] A hot water outlet is provided in the middle of the high-pressure flash evaporator.

[0022] Furthermore: the first valve and the second valve are both DN80 in size. ， The pressure rating is CL150.

[0023] Furthermore, the diameters of the first pipe, the second pipe, the third pipe, and the ring pipe are equal.

[0024] Furthermore, the bottom of the partition is concave.

[0025] Furthermore, N≥8.

[0026] The ring pipe device for cleaning sediment in a water system provided by this utility model has the following advantages:

[0027] A process technology is provided to effectively reduce the solid content in the hot water effluent from the upper tower hot water chamber of a high-pressure flash evaporator in a coal gasification slag water treatment system.

[0028] Intermittent discharge is achieved using an open circular pipe suction tube. The circular pipe has a diameter of 80mm, with 16 evenly distributed 18mm diameter holes at the bottom. The circular pipe, with a diameter of 2000mm, surrounds the riser pipe and is located at the bottom center of the hot water chamber of the high-pressure flash evaporator. The circular pipe is led out of the hot water chamber of the high-pressure flash evaporator through an external pipeline to a safe location for discharge. A DN80 manual valve and a programmable valve are installed on the pipeline exiting the high-pressure flash evaporator to achieve remote control and timed discharge.

[0029] This device enables the cleaning of ash accumulation at the bottom of the hot water chamber of the high-pressure flash evaporator, reducing pipeline and equipment blockage and improving system operating cycle;

[0030] This device is based on the bottom of the hot water chamber of the high-pressure flash evaporator, and the structure of the high-pressure flash evaporator within the device has been improved. This structure is easy to modify, the materials are readily available, and it will not affect the equipment itself.

[0031] The effects of this utility model patent are significant: it effectively prevents the formation of ash clumps at the bottom of the high-pressure flash evaporator, eliminates the hidden dangers of blockage in downstream pipelines and equipment and long-term stable operation of pumps, ensures a healthy water system circulation, improves the quality of process water in the system, effectively prevents scaling in the system, avoids forced equipment shutdowns, and reduces the workload of system maintenance and cleaning; thus, it effectively reduces and saves production costs, and has good performance. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 It is a loop pipe device for cleaning sediment from water systems;

[0034] Figure 2 This is a schematic diagram of a loop pipe;

[0035] Attached reference numerals: 1. Ring pipe; 2. Baffle plate; 3. High-temperature and high-pressure black water inlet; 4. Evaporation chamber outlet; 5. First pipe; 6. First valve; 7. Second pipe; 8. Second valve; 9. Third pipe; 10. Hot water chamber outlet; 11. Tray; 12. Low-temperature process water inlet; 13. Vapor phase outlet; 14. Ring pipe opening. Detailed Implementation

[0036] It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. 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.

[0038] Figure 1 It is a loop pipe device for cleaning sediment from water systems;

[0039] A loop pipe device for cleaning sediments in a water system includes a high-pressure flash tower, a riser pipe, and a remote control device;

[0040] A partition 2 is installed in the middle of the evaporating hot water. The upper part of the partition 2 is the heating chamber, and the lower part of the partition 2 is the evaporation chamber.

[0041] The gas riser pipe passes through the middle of the partition 2 and is located in the middle of the high-pressure flash tower;

[0042] A shielding part is provided at the upper part of the riser pipe;

[0043] A high-temperature and high-pressure black water inlet 3 is provided in the middle of the high-pressure flash evaporation tower. The water temperature of the high-temperature and high-pressure black water inlet 3 is 240℃ and the pressure is 6.3MPa.

[0044] An evaporation chamber outlet 4 is provided at the bottom of the high-pressure flash evaporator. The water temperature at the evaporation chamber outlet is 170℃ and the pressure is 0.8MPa.

[0045] A tray 11 is installed at the top of the high-pressure flash evaporator for direct heat exchange. The process water (temperature 170°C) after heat exchange flows by gravity to the hot water chamber at the top of the high-pressure flash evaporator.

[0046] A low-temperature process water inlet 12 is provided above the tray 11 at the top of the high-pressure flash evaporator. The water temperature of the low-temperature process water inlet 12 is 79.5℃ and the pressure is 1.2MPa.

[0047] A vapor outlet 13 is provided at the top of the high-pressure flash evaporator for the discharge of water vapor, and also facilitates the discharge of acidic gases (CO2, H2S, etc.).

[0048] A drainage module for the ring pipe 1 is provided at the bottom of the partition 2;

[0049] The sewage discharge module of the ring pipe 1 includes a ring pipe 1, and a first pipe 5, a second pipe 7, and a third pipe 9 connected to the ring pipe 1;

[0050] A first valve 6 is installed between the first pipe 5 and the second pipe 7;

[0051] A first valve 8 is installed between the second pipe 7 and the third pipe 9;

[0052] The first and second valves are both DN80 in size. ， The pressure rating is CL150;

[0053] The other end of the third pipe is connected to the sewage tank;

[0054] The remote control device is connected to the second valve;

[0055] The remote control device used is Centum vp 6.0.5.

[0056] The diameters of the first pipe 5, the second pipe 7, the third pipe 9, and the ring pipe 1 are equal;

[0057] Pipeline 5 (first), pipeline 7 (second), and pipeline 9 (third) are DN80 pipes.

[0058] The annular pipe 1 is disposed around the riser pipe; the pipe itself has a diameter of 80 mm, and the radius of the annular pipe 1 is 1000 mm.

[0059] Figure 2 This is a schematic diagram of a loop pipe;

[0060] N openings 14 are provided on the annular tube 1 at fixed intervals, the centers of the N openings 14 are on the same horizontal line, and the diameter of the openings 14 is 18mm; N≥8,

[0061] The N openings 14 must be located on the lower side of the annular tube 1;

[0062] A hot water outlet 10 is provided in the middle of the high-pressure flash evaporator. The water temperature of the hot water outlet 10 is 173℃ and the pressure is 0.8MPa.

[0063] Example 1: The specific working process of the loop pipe 1 device for cleaning sediment in a water system according to this application is as follows:

[0064] High-temperature, high-pressure black water (temperature 240℃, pressure 6.3MPa) is processed... Figure 1The high-temperature, high-pressure black water inlet 3 shown enters the evaporation chamber of the high-pressure flash evaporator (pressure 0.8 MPa) for flash evaporation. The flashed water vapor and some acidic gases (CO2, H2S, etc.) dissolved in the black water are rapidly flashed out and then enter the upper part of the high-pressure flash evaporator through the riser pipe. The process water (temperature 79℃) directly contacts the tray 11 for heat exchange through the low-temperature process water inlet 12 shown in the diagram. After heat exchange, the process water (temperature 170℃) flows by gravity to the hot water chamber at the top of the high-pressure flash evaporator. The process water in the hot water chamber is then sent to the next process through the hot water chamber outlet 10. The unevaporated process water in the lower evaporation chamber is sent out of the high-pressure flash evaporator through the evaporation chamber outlet 4. The gas phase (acidic gas and some steam) at the top of the hot water chamber is sent out of the high-pressure flash evaporator through the top outlet 13.

[0065] During normal production, there were no measures to treat the ash accumulation at the bottom of the hot water chamber, which was allowed to accumulate and deposited at the hot water outlet. When the ash reached the outlet, it was carried by the water flow to the subsequent pipes and equipment. The high-pressure flash evaporator was manually cleaned after it was shut down.

[0066] This application designs a ring pipe 1 (shown in direction A) around the bottom of the hot water chamber, with a radius of 1000mm. The bottom of the ring pipe 1 has 16 small openings 14 and φ18, which are evenly arranged. The ring pipe 1 is led out of the high-pressure flash evaporator tower and into the water tank through a first pipe 5 of the same diameter as the ring pipe 1. Two valves are installed after the first pipe 5 exits the hot water chamber: the first valve 6 and the second valve 8.

[0067] Since the process water in the hot water chamber contains about 0.1-0.5% fine ash, which easily settles and accumulates at the bottom of the hot water chamber, in order to prevent the precipitate from clumping after a long time, the pressure of the high-pressure flash evaporator (0.8MPa) is used to open the second valve 8 at regular intervals to discharge the fine ash that has settled and accumulated at the bottom of the hot water chamber.

[0068] The first valve 6 remains open during normal operation, and is closed when the second valve 8 malfunctions and requires isolation for maintenance.

[0069] Control of the second valve 8: After the timer expires, control the second valve 8 to operate as follows: the second valve 8 opens, closes after 3 seconds, opens again after 2 seconds, repeats the above operation 6 times, stops the operation, starts timing, and starts timing for 6 hours. After 6 hours, the next round of operation begins.

[0070] Principle: When the second valve 8 is opened, the water at the bottom of the hot water chamber is forced out using the pressure inside the tower (0.8MPa). The ash deposited at the bottom of the hot water chamber enters with the water through the small hole below the ring pipe 1, and is discharged into the water tank through the first pipe 5, the first valve 6, the second pipe 7, the second valve 8, and the third pipe 9. After 3 seconds, the second valve 8 is closed, and the water in the first pipe 5 and the second pipe 7 immediately stops flowing. Due to inertia, the process water below the opening forms a turbulent flow, causing the ash particles farther from the small hole to gather at the bottom of the hot water chamber. When the second valve 8 is closed, the ash is denser than the water. Due to inertia and the shape of the bottom of the hot water chamber, the ash particles continue to gather at the bottom of the ring pipe 1. After 2 seconds, when the second valve 8 is opened again, the newly gathered ash is sucked away. This process is repeated 6 times to remove the ash. When there is no pressure inside the tower, the same action is performed using the static pressure of the hot water chamber liquid level and the siphon principle. The ash at the bottom of the hot water chamber can also be discharged through the opening 14 of the ring pipe 1.

[0071] The bottom of the partition 2 in this application must be concave.

[0072] 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 loop pipe device for cleaning sediment from a water system, characterized in that: Includes a high-pressure flash tower, a riser pipe, and a remote control device; A partition is installed in the middle of the high-pressure flash tower. The upper part of the partition is divided into a hot water chamber, and the lower part of the partition is an evaporation chamber. The gas riser pipe passes through the middle of the partition and is located in the middle of the high-pressure flash tower; A shielding part is provided at the upper part of the riser pipe; A high-temperature, high-pressure black water inlet is located in the middle of the high-pressure flash evaporation tower. An evaporation chamber outlet is located at the bottom of the high-pressure flash evaporator. A tray is provided at the top of the high-pressure flash tower; A low-temperature process water inlet is provided above the tray at the top of the high-pressure flash evaporator; A gas phase outlet is provided at the top of the high-pressure flash evaporator; A ring-shaped sewage discharge module is provided at the bottom of the partition. The ring pipe sewage module includes a ring pipe, a first pipe, a second pipe, and a third pipe connected to the ring pipe, and N holes are provided on the ring pipe at fixed intervals. A first valve is installed between the first pipe and the second pipe; A second valve is installed between the second and third pipes; The other end of the third pipe is connected to the sewage tank; A hot water outlet is provided in the middle of the high-pressure flash evaporator. The remote control device is connected to the second valve.

2. The loop pipe device for cleaning sediment in a water system according to claim 1, characterized in that: The first and second valves are both DN80 in size. ， The pressure rating is CL150.

3. The loop pipe device for cleaning sediment in a water system according to claim 1, characterized in that: The diameters of the first pipe, the second pipe, the third pipe, and the ring pipe are equal.

4. The loop pipe device for cleaning sediment in a water system according to claim 1, characterized in that: The bottom of the partition is concave.

5. A loop pipe device for cleaning sediment in a water system according to claim 1, characterized in that: N≥8。 6. A loop pipe device for cleaning sediment in a water system according to claim 1, characterized in that: The remote control device used is Centum vp 6.0.5.

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