Cleaning system for MTO washing water cooler

Abstract

The utility model discloses a cleaning system for an MTO washing water cooler, relates to the technical field of online cleaning of coolers, and is mainly used for solving the problem that a washing water channel of the washing water cooler is blocked by oil sludge. The input end and the output end of the reagent conveying pipe are both communicated with a washing water channel of the washing water cooler, and a reagent recycling valve, a recycling settling tank, a recycling pump, a reagent tank, a reagent pump and a reagent output valve are sequentially arranged on the reagent conveying pipe in the reagent conveying direction; and a flushing reagent is filled in the reagent tank. The utility model provides a cleaning system for an MTO (Methanol To Olefins) washing water cooler, which can automatically clean oil sludge in a washing water channel, ensures the heat exchange efficiency of the washing water cooler, does not need excessive manual participation, and reduces the labor intensity and the maintenance cost.

Description

Technical Field

[0001] This utility model relates to the field of online cleaning technology for coolers, and in particular to a cleaning system for MTO water-washing coolers. Background Technology

[0002] In an MTO (methanol to olefins) unit, the product of the reactor is a high-temperature reaction gas at nearly 500°C. The high-temperature reaction gas recovers its high-temperature heat by superheating saturated methanol gas, and is generally cooled to 250-280°C. The cooled reaction gas enters a quench tower to remove the solid catalyst and cool down. The reaction gas washed by the quench tower enters a water washing tower to remove the remaining solid catalyst and further cool down. Finally, the reaction gas is cooled to below 45°C and sent to the olefin separation unit.

[0003] The water washing system of the MTO unit is a key technology directly affecting the stable operation of the unit. The reaction gas, at approximately 110°C, discharged from the quench tower, requires further water washing. The main purposes are to condense and precipitate the water generated in the product gas before sending it to the wastewater stripping tower, to solidify and precipitate the oily substances generated by the MTO side reaction, and to wash away any remaining small amount of catalyst in the product gas. Analysis of the oily substances in the water washing system revealed that the aromatic hydrocarbon content was as high as 95%, mainly trimethylbenzene, tetramethylbenzene, and pentamethylbenzene.

[0004] However, the oily substances in the wash water of the MTO unit have a low freezing point and are easily condensed in the wash water. Therefore, the oily substances in the wash water of the MTO unit mix with the solid catalyst to form sludge. The continuous accumulation of sludge will block the wash water channels of the wash water cooler, resulting in poor heat exchange efficiency. Currently, in order to solve this problem, the wash water cooler needs to be manually flushed once a week on average, and the cooler needs to be disassembled and cleaned for maintenance every six months. This results in high labor intensity and high maintenance costs. Utility Model Content

[0005] The purpose of this invention is to provide a cleaning system for MTO water-washing coolers, which can automatically clean the sludge in the water-washing channels, ensuring the heat exchange efficiency of the water-washing coolers. At the same time, it does not require much manual intervention, reducing labor intensity and maintenance costs.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is: a cleaning system for an MTO water washing water cooler, including a water washing water cooler, and a reagent delivery pipe whose input end and output end are both connected to the water washing water channel of the water washing water cooler. The reagent delivery pipe is provided with a reagent recovery valve, a recovery sedimentation tank, a recovery pump, a reagent tank, a reagent pump and a reagent output valve in sequence along the reagent delivery direction; the reagent tank contains rinsing reagent.

[0007] As a further improvement of this utility model, the water washing cooler is connected to a cooling water inlet pipe, a cooling water outlet pipe, a water washing water inlet pipe, and a water washing water outlet pipe. The water washing water inlet pipe is equipped with a water washing water inlet valve, and the water washing water outlet pipe is equipped with a water washing water outlet valve.

[0008] As a further improvement of this utility model, an inlet pressure gauge is provided on the water inlet pipe between the water inlet valve and the water cooler, and an outlet pressure gauge is provided on the water outlet pipe between the water outlet valve and the water cooler; the water inlet valve, the inlet pressure gauge, the water outlet valve, and the outlet pressure gauge are all connected to a differential pressure transmitter.

[0009] As a further improvement of this utility model, the water washing water input pipe between the water washing water input valve and the inlet pressure gauge is connected to the output end of the reagent delivery pipe; the water washing water output pipe between the water washing water output valve and the outlet pressure gauge is connected to the input end of the reagent delivery pipe.

[0010] As a further improvement of this utility model, the reagent pump is connected to an electric motor, and the electric motor is connected to a differential pressure transmitter for signal transmission.

[0011] As a further improvement of this utility model, the electric motor is also connected to the reagent recovery valve and the reagent output valve via signal connection.

[0012] As a further improvement of this utility model, a dosing tube is connected to the reagent container.

[0013] As a further improvement of this utility model, the two side walls of the recovery settling tank are respectively provided with a reagent inlet and a skimming trough. The skimming trough is connected to the oil tank, and the side wall of the recovery settling tank below the skimming trough is also provided with a reagent outlet.

[0014] As a further improvement of this utility model, the top of the recycling settling tank is connected to a deoxygenated water inlet pipe, and the bottom is provided with a sewage outlet pipe.

[0015] Beneficial effects

[0016] Compared with the prior art, the advantages of the cleaning system for MTO water washing water coolers of this utility model are as follows:

[0017] 1. This system, through the coordinated operation of a reagent tank, a reagent pump, and a reagent delivery pipe, pumps the rinsing reagent from the reagent tank to the washing water channel from the output end of the reagent delivery pipe, rinsing away the sludge in the washing water channel and ensuring the heat exchange efficiency of the washing water cooler. Simultaneously, the rinsed reagent enters the recovery settling tank from the input end of the reagent delivery pipe. After settling and stratifying from top to bottom into oil, water, and solid catalyst, the water containing the rinsing reagent is then pumped back to the reagent tank using the recovery pump and reagent delivery pipe, thus forming a rinsing pipeline with a circulating flow of rinsing reagent, improving the rinsing effect and the utilization rate of the rinsing reagent. Furthermore, the system can selectively connect / isolate from the washing water cooler by opening / closing the reagent recovery valve and reagent output valve, thereby preventing the washing water cooler from affecting the cleaning system during normal operation.

[0018] Therefore, the system can automatically clean the sludge in the water washing channel when needed, without much manual intervention, thus reducing labor intensity and maintenance costs while ensuring the heat exchange efficiency of the water washing cooler.

[0019] The present invention will become clearer from the following description and in conjunction with the accompanying drawings, which are used to explain the embodiments of the present invention. Attached Figure Description

[0020] 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 only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of this utility model.

[0022] Wherein: 1-wash water cooler; 11-cooling water inlet pipe; 12-cooling water outlet pipe; 13-wash water inlet pipe; 131-wash water inlet valve; 14-wash water outlet pipe; 141-wash water outlet valve; 15-inlet pressure gauge; 16-outlet pressure gauge; 2-reagent delivery pipe; 21-reagent outlet valve; 22-reagent recovery valve; 3-recovery settling tank; 31-deoxygenated water inlet pipe; 32-sewage pipe; 33-skimming trough; 34-oil tank; 4-recovery pump; 5-reagent tank; 51-dosing pipe; 6-reagent pump; 61-motor; 7-differential pressure transmitter. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; of course, they can also refer to a mechanical connection or a signal connection; furthermore, they can refer to a direct connection, an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0025] Embodiments of the present invention will now be described with reference to the accompanying drawings.

[0026] Example:

[0027] The specific embodiments of this utility model are as follows: Figure 1 As shown, a cleaning system for an MTO (Medium-to-Oxygen) water washing water cooler includes a water washing water cooler 1. The water washing water cooler 1 is connected to a cooling water inlet pipe 11, a cooling water outlet pipe 12, a water washing water inlet pipe 13, and a water washing water outlet pipe 14. The cooling water inlet pipe 11 is connected to the inlet end of a cooling water channel, and the cooling water outlet pipe 12 is connected to the outlet end of the cooling water channel. The water washing water inlet pipe 13 is connected to the inlet end of the water washing water channel, and the water washing water outlet pipe 14 is connected to the outlet end of the water washing water channel. Through the heat exchange between the cooling water channel and the water washing water channel, cooling of the water washing water can be achieved. In this embodiment, 8 to 14 water washing water coolers 1 are generally installed, and each water washing water cooler 1 has a backup device.

[0028] To clean the sludge in the washing water channel, the system also includes a reagent delivery pipe 2, whose inlet and outlet are both connected to the washing water channel of the washing water cooler 1. Along the reagent delivery direction, the reagent delivery pipe 2 is sequentially equipped with a reagent recovery valve 22, a recovery settling tank 3, a recovery pump 4, a reagent tank 5, a reagent pump 6, and a reagent output valve 21. The reagent tank 5 contains a rinsing reagent, which can generally be xylene, a scale inhibitor / dispersant, or a slow-release agent. In this embodiment, a washing water inlet valve 131 is provided on the washing water inlet pipe 13; and a washing water outlet valve 141 is provided on the washing water outlet pipe 14.

[0029] When the water washing cooler 1 is working normally, the water washing water inlet valve 131 and the water washing water outlet valve 141 are in the open state, while the reagent recovery valve 22, the reagent outlet valve 21, and the reagent pump 6 are in the closed state. At this time, the reagent delivery pipe 2 is not connected to the water washing water channel of the water washing cooler 1. When the water washing water channel of the water washing cooler 1 is blocked by sludge, the water washing cooler 1 needs to be switched off and a standby cooler needs to be used. At this time, first close the water washing water inlet valve 131 and the water washing water outlet valve 141, and open the reagent recovery valve 22, the reagent outlet valve 21, and the reagent pump 6 to flush the sludge from the water washing water channel of the water washing cooler 1.

[0030] Specifically: First, the reagent tank 5, reagent pump 6, and reagent delivery pipe 2 work together to pump the rinsing reagent in reagent tank 5 from the output end of reagent delivery pipe 2 into the water washing channel to rinse the oil sludge in the water washing channel. Then, the rinsed reagent enters the recovery settling tank 3 from the input end of reagent delivery pipe 2, where it settles from top to bottom into layers of oil, water, and solid catalyst. Afterward, the recovery pump 4 and reagent delivery pipe 2 work together to pump the water containing the rinsing reagent back to reagent tank 5, completing the circulation of the rinsing reagent.

[0031] During this process, the system can automatically clean the sludge in the washing water channel when needed, requiring minimal manual intervention. This reduces labor intensity and maintenance costs while maintaining the heat exchange efficiency of the washing water cooler. Simultaneously, the washing water channel and reagent delivery pipe form a rinsing pipeline for circulating rinsing reagent, improving rinsing effectiveness and reagent utilization. Furthermore, the system can selectively connect / isolate from the washing water cooler by opening / closing the reagent recovery valve and reagent output valve, thus preventing the washing water cooler from affecting the cleaning system during normal operation.

[0032] In this system, to improve system automation and reduce manual intervention, an inlet pressure gauge 15 is installed on the wash water inlet pipe 13 between the wash water inlet valve 131 and the wash water cooler 1, and an outlet pressure gauge 16 is installed on the wash water outlet pipe 14 between the wash water outlet valve 141 and the wash water cooler 1. The wash water inlet valve 131, inlet pressure gauge 15, wash water outlet valve 141, and outlet pressure gauge 16 are all connected to a differential pressure transmitter 7. In this embodiment, the wash water inlet pipe 13 between the wash water inlet valve 131 and the inlet pressure gauge 15 is connected to the output end of the reagent delivery pipe 2; the wash water outlet pipe 14 between the wash water outlet valve 141 and the outlet pressure gauge 16 is connected to the input end of the reagent delivery pipe 2.

[0033] The pressure information in the wash water inlet pipe 13 and the wash water outlet pipe 14 can be detected in real time by the inlet pressure gauge 15 and outlet pressure gauge 16, and the relevant information is transmitted to the differential pressure transmitter 7. This allows the system to automatically determine whether there is a blockage in the wash water channel within the wash water cooler 1. If the inlet pressure equals the outlet pressure, the wash water channel is unobstructed; if the inlet pressure is greater than the outlet pressure, the wash water channel is blocked. When the pressure difference reaches a certain level, it indicates that the wash water cooler 1 needs to be switched off and a standby cooler needs to be used. At this time, the differential pressure transmitter 7 can control the wash water inlet valve 131 and the wash water outlet valve 141 to close. Of course, in actual use, the inlet pressure gauge 15 and outlet pressure gauge 16 can be replaced with temperature sensors, and the differential pressure transmitter 7 can be replaced with a temperature difference transmitter to determine whether there is sludge deposition by detecting the temperature difference. Therefore, this system eliminates the need for frequent manual checks of the wash water channel and can automatically shut down the wash water cooler 1, achieving a high degree of automation.

[0034] Furthermore, to further enhance system automation, this system connects reagent pump 6 to an electric motor 61, which in turn is connected to a differential pressure transmitter 7. While controlling the closure of the wash water inlet valve 131 and the wash water outlet valve 141, the differential pressure transmitter 7 also transmits a signal to the electric motor 61, thereby controlling the start of reagent pump 6. Moreover, in this embodiment, the electric motor 61 is also connected to the reagent recovery valve 22 and the reagent outlet valve 21, enabling the reagent pump 6 to start simultaneously with the opening of these valves. Thus, the entire cleaning system can be fully automated, requiring no manual intervention and minimizing labor intensity and maintenance costs.

[0035] Meanwhile, to enable the reuse of the recovered rinsing reagent in this system, reagent inlets and skimming troughs 33 are respectively provided on the two side walls of the recovery settling tank 3. The skimming trough 33 is connected to the oil tank 34, and a reagent outlet is also provided on the side wall of the recovery settling tank 3 below the skimming trough 33. In use, the reagent delivery pipe 2 transports the recovered rinsing reagent from the reagent inlet to the recovery settling tank 3 for settling. After settling, the rinsing reagent achieves separation of oil, water, and solid catalyst, with a significant settling separation effect. Among them, the water containing reagent in the recovery settling tank 3 enters the reagent delivery pipe 2 through the reagent outlet and is pumped to the reagent tank 5 by the recovery pump 4 for recycling, which can improve the reagent utilization rate. The oil is sent to the oil tank 34 for recycling through the skimming trough 33, which can increase the recovery of oil substances and increase added value.

[0036] In this embodiment, the top of the recovery settling tank 3 is connected to a deoxygenated water inlet pipe 31, and the bottom is equipped with a drain pipe 32. After recovering the rinsing reagent and oil, deoxygenated water is injected to dilute the solid catalyst, and the solution is discharged from the drain pipe 32 at the bottom of the recovery settling tank 3, which effectively prevents the solid catalyst from solidifying and clogging at the bottom of the recovery settling tank 3. At the same time, since the reagent tank 5 is connected to the dosing pipe 51, the rinsing reagent can also be diluted by injecting deoxygenated water, and the diluted rinsing reagent can be sent to the reagent tank 5 via the recovery pump 4 for re-mixing and reuse, thus making the operation flexible and solving the problem of rinsing reagent loss. In addition, the deoxygenated water can also be used as a supplementary means of level control in the recovery settling tank 3 during the rinsing process. With the level gauge installed in the recovery settling tank 3, the level of the recovery settling tank 3 can be effectively controlled, thereby ensuring effective separation of oil and water with obvious separation effect.

[0037] The present invention has been described above in conjunction with the preferred embodiments, but the present invention is not limited to the embodiments disclosed above, but should cover various modifications and equivalent combinations made in accordance with the essence of the present invention.

Claims

1. A cleaning system for an MTO water-washing cooler, comprising a water-washing cooler (1), characterized in that, It also includes a reagent delivery pipe (2) whose input and output ends are connected to the water washing water channel of the water washing water cooler (1). The reagent delivery pipe (2) is provided with a reagent recovery valve (22), a recovery sedimentation tank (3), a recovery pump (4), a reagent tank (5), a reagent pump (6), and a reagent output valve (21) in sequence along the reagent delivery direction. The reagent tank (5) contains rinsing reagent.

2. The cleaning system for MTO water-washing coolers according to claim 1, characterized in that, The water washing cooler (1) is connected to a cooling water inlet pipe (11), a cooling water outlet pipe (12), a water washing water inlet pipe (13), and a water washing water outlet pipe (14). The water washing water inlet pipe (13) is equipped with a water washing water inlet valve (131), and the water washing water outlet pipe (14) is equipped with a water washing water outlet valve (141).

3. The cleaning system for an MTO water-washing cooler according to claim 2, characterized in that, An inlet pressure gauge (15) is provided on the water inlet pipe (13) between the water inlet valve (131) and the water cooler (1), and an outlet pressure gauge (16) is provided on the water outlet pipe (14) between the water outlet valve (141) and the water cooler (1); the water inlet valve (131), the inlet pressure gauge (15), the water outlet valve (141) and the outlet pressure gauge (16) are all connected to a differential pressure transmitter (7).

4. The cleaning system for an MTO water-washing cooler according to claim 3, characterized in that, The water washing water inlet pipe (13) between the water washing water inlet valve (131) and the inlet pressure gauge (15) is connected to the output end of the reagent delivery pipe (2); the water washing water outlet pipe (14) between the water washing water outlet valve (141) and the outlet pressure gauge (16) is connected to the input end of the reagent delivery pipe (2).

5. The cleaning system for an MTO water-washing cooler according to claim 3 or 4, characterized in that, The reagent pump (6) is connected to an electric motor (61), and the electric motor (61) is connected to a differential pressure transmitter (7) via signal connection.

6. The cleaning system for an MTO water-washing cooler according to claim 5, characterized in that, The motor (61) is also connected to the reagent recovery valve (22) and the reagent output valve (21) via signal connection.

7. The cleaning system for an MTO water-washing cooler according to claim 1, characterized in that, The reagent container (5) is connected to a dosing tube (51).

8. The cleaning system for an MTO water-washing cooler according to claim 1, characterized in that... The two side walls of the recovery settling tank (3) are respectively provided with a reagent inlet and a skimming trough (33). The skimming trough (33) is connected to the oil tank (34), and the side wall of the recovery settling tank (3) below the skimming trough (33) is also provided with a reagent outlet.

9. The cleaning system for an MTO water-washing cooler according to claim 8, characterized in that, The top of the recycling settling tank (3) is connected to a deoxygenated water input pipe (31), and the bottom is equipped with a sewage discharge pipe (32).

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