Automatic warm washing control system and method for sleeve crystallizer of urea dewaxing device

Abstract

The invention relates to an automatic warm washing control system and method for a sleeve crystallizer of a urea dewaxing device, the system comprises the sleeve crystallizer, a controller, a cold water device and a hot water device, the cold water device and the hot water device are respectively communicated with two ends of the sleeve crystallizer through pipelines, and the cold water device and the hot water device are respectively in communication connection with the controller. The method has the beneficial effects that the method is simple, the design is reasonable, the automatic warm washing operation of the sleeve crystallizer can be realized, the labor cost is saved, the production efficiency is improved, the problem of uneven manual warm washing effects can be effectively solved, meanwhile, the safety degree is high, and the overpressure problem of the sleeve crystallizer caused by improper manual operation is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of crude oil processing, and particularly relates to an automatic temperature washing control system and method for a casing crystallizer of a urea dewaxing device. Background Art

[0002] Some fraction products generated in the crude oil processing process, such as diesel fractions, kerosene fractions, etc., contain a large amount of n-alkane components. This part of the n-alkane components is commonly known as liquid paraffin. The carbon atom range of liquid paraffin is C6 - C27, which is an important chemical raw material and is widely used in synthetic detergents, chlorinated paraffins, oilfield chemicals, plasticizers, fertilizer moisture-proof agents, synergists, leather fatliquors, pesticide emulsifiers, rubber flame retardants, lubricant additives, etc.

[0003] Urea dewaxing is an important method for producing liquid paraffin. At present, the processing capacity of domestic urea dewaxing devices has reached 300,000 tons / year. The urea dewaxing process mainly uses the n-alkanes in the oil to react with urea in an isopropanol solution to form solid complexes, which are then separated from the oil, and the complexes are decomposed at a higher temperature to obtain n-alkanes.

[0004] The casing crystallizer is the core equipment of the urea dewaxing device and is the core place where the n-alkanes and urea undergo complexation reactions. The operating stability of the casing crystallizer has an important impact on the quality and yield of liquid paraffin. As the reaction progresses, complexes will gradually adhere to the inner wall of the casing crystallizer, affecting the heat transfer effect of the casing crystallizer, and further affecting the reaction rate and reaction effect, resulting in a decrease in the processing capacity of the device and a decrease in the quality and yield of liquid paraffin.

[0005] At present, the industrial solution to the above problems is generally to use the method of manual regular temperature washing. During the temperature washing process, the operator closes / opens the cold water feed, cold water return, hot water feed, hot water return, and reaction product valves in a certain sequence and time interval. Manual temperature washing has problems such as high labor intensity of the operator and uneven temperature washing effects. If the operation is improper, it may also cause overpressure of the casing crystallizer and trigger safety accidents. Summary of the Invention

[0006] The present invention provides an automatic temperature washing control system and method for a casing crystallizer of a urea dewaxing device, aiming to solve the problems in the prior art.

[0007] The technical solution of the present invention to solve the above technical problems is as follows:

[0008] An automatic temperature washing control system for a casing crystallizer of a urea dewaxing device, comprising a casing crystallizer, a controller, a cold water device, and a hot water device. The cold water device and the hot water device are respectively connected to both ends of the casing crystallizer through pipelines, and the cold water device and the hot water device are respectively in communication connection with the controller.

[0009] The beneficial effects of the present invention are as follows: during the urea dewaxing operation, cold water is provided to the casing crystallizer by the cold water device for operation, and the hot water device is closed during this process;

[0010] When crystallization appears in the casing crystallizer and warm washing operation is required, the cold water device is closed, and at the same time, the hot water device is turned on. Hot water is provided to the casing crystallizer by the hot water device to remove the crystallization in the casing crystallizer, ensuring that the casing crystallizer can perform dewaxing operation.

[0011] The method of the present invention is simple and reasonably designed, can realize the automatic warm washing operation of the casing crystallizer, saves labor costs, improves production efficiency, can effectively solve the problem of uneven effects of manual warm washing, and has a high safety level, avoiding the overpressure problem of the casing crystallizer caused by improper manual operation.

[0012] On the basis of the above technical solution, the present invention can be further improved as follows.

[0013] Further, the hot water device includes a hot water supply pipeline, one end of the hot water supply pipeline is communicated with the water inlet end of the casing crystallizer, and the other end is used for communicating with a hot water supply device; a hot water pump is fixedly installed on the hot water supply pipeline, and the hot water pump is communicatively connected with the controller.

[0014] The beneficial effect of adopting the above further solution is that the structure is simple and reasonably designed. During the warm washing process, the hot water in the hot water supply device is sent to the casing crystallizer through the hot water supply pipeline by the hot water pump to remove the crystallization in the casing crystallizer.

[0015] Further, the hot water device further includes a hot water return pipeline, one end of the hot water return pipeline is communicated with the water outlet end of the casing crystallizer, and the other end is used for communicating with a hot water return device.

[0016] The beneficial effect of adopting the above further solution is that the structure is simple and reasonably designed, and the hot water after warm washing is recycled through the hot water return pipeline, saving water resources.

[0017] Further, hot water valves are respectively fixedly installed on the hot water supply pipeline and / or the hot water return pipeline, and each hot water valve is communicatively connected with the controller.

[0018] The beneficial effect of adopting the above further solution is that the structure is simple and reasonably designed. The controller controls the water supply and return of hot water by controlling the two hot water valves, realizing the automatic control of hot water, with convenient operation and high efficiency.

[0019] Further, the cold water device includes a cold water supply pipeline, one end of which is communicated with the water inlet end of the sleeve crystallizer, and the other end is used to communicate with a cold water supply device; a cold water pump is fixedly installed on the cold water supply pipeline, and the cold water pump is communicatively connected with the controller.

[0020] The beneficial effect of adopting the above further solution is that the structure is simple and the design is reasonable. During the dewaxing process, cold water in the cold water supply device is sent into the sleeve crystallizer through the cold water supply pipeline by the cold water pump to perform the dewaxing operation.

[0021] Further, the cold water device further includes a cold water return pipeline, one end of which is communicated with the water outlet end of the sleeve crystallizer, and the other end is used to communicate with a cold water return device.

[0022] The beneficial effect of adopting the above further solution is that the structure is simple and the design is reasonable. The cold water after the dewaxing operation is recovered through the cold water return pipeline, saving water resources.

[0023] Further, cold water valves are respectively fixedly installed on the cold water supply pipeline and / or the cold water return pipeline, and each cold water valve is communicatively connected with the controller.

[0024] The beneficial effect of adopting the above further solution is that the structure is simple and the design is reasonable. The controller controls the supply and return of cold water by controlling the two cold water valves, realizing the automatic control of cold water, which is convenient for operation and has high efficiency.

[0025] Further, the water inlet end of the sleeve crystallizer is communicated with one end of a water inlet pipeline, one end of the hot water supply pipeline is communicated with the other end of the water inlet pipeline, and one end of the cold water supply pipeline is communicated with the hot water supply pipeline.

[0026] The beneficial effect of adopting the above further solution is that the structure is simple, the distribution of each pipeline is reasonable, the space is saved, and the cost is reduced.

[0027] Further, a flow transmitter is fixedly installed on the hot water supply pipeline, and a temperature transmitter is fixedly installed on the cold water supply pipeline.

[0028] The beneficial effect of adopting the above further solution is that the structure is simple and the design is reasonable. The hot water flow in the hot water supply pipeline is detected by the flow transmitter, and at the same time, the temperature of the cold water in the cold water supply pipeline can be detected by the temperature transmitter.

[0029] The present invention also relates to an automatic temperature washing control method for the sleeve crystallizer of a urea dewaxing device, which is realized by using the automatic temperature washing control system for the sleeve crystallizer of the urea dewaxing device as described above, and includes the following specific steps:

[0030] Start condition verification. If the start condition verification fails, the subsequent automatic warm washing program is not allowed, and the start condition verification continues until it passes;

[0031] After the condition verification passes, the cold water device is closed and the warm water device is started to perform warm washing operation on the casing crystallizer;

[0032] After the warm washing operation is completed, the warm water device is closed and the cold water device is started to perform normal urea dewaxing treatment operation.

[0033] The beneficial effect of adopting the above further solution is that the present invention also provides a method for automatically controlling the warm washing of the casing crystallizer of a urea dewaxing device. The control method is simple, reasonably designed, can realize the automatic warm washing operation of the casing crystallizer, saves labor costs, improves production efficiency, can effectively solve the problem of uneven effects of manual warm washing, and has a high safety level, avoiding the overpressure problem of the casing crystallizer caused by improper manual operation. Brief Description of the Drawings

[0034] Figure 1 It is a schematic structural diagram of the warm washing control system in the present invention;

[0035] Figure 2 It is a schematic structural diagram of the control panel in the present invention.

[0036] In the drawings, the list of components represented by each reference numeral is as follows:

[0037] 1. Casing crystallizer; 2. Hot water supply pipeline; 3. Hot water return pipeline; 4. Hot water valve; 5. Cold water supply pipeline; 6. Cold water return pipeline; 7. Cold water valve; 8. Flow transmitter; 9. Temperature transmitter. Detailed Embodiments

[0038] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0039] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise stated, the meaning of "a plurality" is two or more.

[0040] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected", "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific circumstances.

[0041] The present invention will be described in detail below with reference to the drawings and in conjunction with embodiments.

[0042] Embodiment 1

[0043] As Figure 1 and Figure 2 shown, this embodiment provides an automatic temperature washing control system for the casing crystallizer of a urea dewaxing device, which includes a casing crystallizer 1, a controller, a cold water device, and a hot water device. The cold water device and the hot water device are respectively connected to both ends of the casing crystallizer 1 through pipelines, and the cold water device and the hot water device are respectively in communication connection with the controller.

[0044] During the urea dewaxing operation, cold water is provided to the casing crystallizer 1 by the cold water device for the operation, and the hot water device is closed during this process;

[0045] When crystallization appears in the casing crystallizer 1 and temperature washing operation is required, the cold water device is closed, and at the same time the hot water device is opened. Hot water is provided to the casing crystallizer 1 by the hot water device to remove the crystallization in the casing crystallizer, ensuring that the casing crystallizer can perform the dewaxing operation.

[0046] Based on the above solution, the above-mentioned casing crystallizer 1 can be one, or a plurality of them can be arranged in series.

[0047] The method of this embodiment is simple and reasonably designed, which can realize the automatic temperature washing operation of the casing crystallizer, save labor costs, improve production efficiency, effectively solve the problem of uneven effects of manual temperature washing, and at the same time has a high degree of safety, avoiding the overpressure problem of the casing crystallizer caused by improper manual operation.

[0048] Example 2

[0049] On the basis of Example 1, in this embodiment, the hot water device includes a hot water supply pipeline 2, one end of the hot water supply pipeline 2 is communicated with the water inlet end of the casing crystallizer 1, and the other end is used to communicate with a hot water supply device; a hot water pump is fixedly installed on the hot water supply pipeline 2, and the hot water pump is communicatively connected with the controller.

[0050] This solution has a simple structure and reasonable design. During the temperature washing process, hot water in the hot water supply device is sent into the casing crystallizer 1 through the hot water supply pipeline 2 to remove the crystals in the casing crystallizer 1.

[0051] Example 3

[0052] On the basis of Example 2, in this embodiment, the hot water device further includes a hot water return pipeline 3, one end of the hot water return pipeline 3 is communicated with the water outlet end of the casing crystallizer 1, and the other end is used to communicate with a hot water return device.

[0053] This solution has a simple structure and reasonable design. The hot water after temperature washing is recycled through the hot water return pipeline 3, saving water resources.

[0054] Based on the above solution, the temperature of the hot water fed into the hot water supply pipeline 2 is 80 °C, and the temperature of the hot water sent out from the hot water return pipeline 3 is 70 °C.

[0055] Example 4

[0056] On the basis of Example 3, in this embodiment, hot water valves 4 are respectively fixedly installed on the hot water supply pipeline 2 and / or the hot water return pipeline 3, and each hot water valve 4 is communicatively connected with the controller.

[0057] This solution has a simple structure and reasonable design. The controller controls the water supply and return of hot water by controlling the two hot water valves 4, realizing the automatic control of hot water, which is convenient for operation and has high efficiency.

[0058] Based on the above solution, the above two hot water valves 4 are respectively a hot water supply cut-off valve and a hot water return cut-off valve.

[0059] Alternatively, the above hot water valve 4 can also be a manual valve, but the operation of the manual valve is not as convenient as the above solution.

[0060] Example 5

[0061] Based on any one of Embodiments 2 to 4, in this embodiment, the cold water device includes a cold water supply pipeline 5. One end of the cold water supply pipeline 5 is communicated with the water inlet end of the sleeve crystallizer 1, and the other end is used for communicating with a cold water supply device; a cold water pump is fixedly installed on the cold water supply pipeline 5, and the cold water pump is communicatively connected with the controller.

[0062] This solution has a simple structure and reasonable design. During the dewaxing process, cold water in the cold water supply device is sent into the sleeve crystallizer 1 through the cold water supply pipeline 5 for dewaxing operations.

[0063] Embodiment 6

[0064] Based on Embodiment 5, in this embodiment, the cold water device further includes a cold water return pipeline 6. One end of the cold water return pipeline 6 is communicated with the water outlet end of the sleeve crystallizer 1, and the other end is used for communicating with a cold water return device.

[0065] This solution has a simple structure and reasonable design. The cold water after the dewaxing operation is recycled through the cold water return pipeline 6, saving water resources.

[0066] Based on the above solution, the temperature of the cold water fed into the cold water supply pipeline 5 is 10 °C, and the temperature of the cold water sent out from the cold water return pipeline 6 is 27 °C.

[0067] Embodiment 7

[0068] Based on Embodiment 6, in this embodiment, cold water valves 7 are respectively and fixedly installed on the cold water supply pipeline 5 and / or the cold water return pipeline 6, and each cold water valve 7 is communicatively connected with the controller.

[0069] This solution has a simple structure and reasonable design. The controller controls the water supply and return of cold water by controlling the two cold water valves 7, realizing automatic control of cold water, which is convenient for operation and has high efficiency.

[0070] Based on the above solution, the two cold water valves 7 are respectively a cold water supply cut-off valve and a cold water return cut-off valve.

[0071] Alternatively, the cold water valve 7 can also be a manual valve, but the operation of the manual valve is not as convenient as the above solution.

[0072] Embodiment 8

[0073] Based on any one of Embodiments 5 to 7, in this embodiment, the water inlet end of the sleeve crystallizer 1 is communicated with one end of a water inlet pipeline, one end of the hot water supply pipeline 2 is communicated with the other end of the water inlet pipeline, and one end of the cold water supply pipeline 5 is communicated with the hot water supply pipeline 2.

[0074] This solution has a simple structure, with reasonable distribution of each pipeline, saving space and reducing costs.

[0075] Based on the above solution, the water outlet end of the above-mentioned sleeve crystallizer 1 is connected to one end of the water outlet pipeline, one end of the hot water return pipeline 3 is connected to the other end of the water outlet pipeline, and one end of the cold water return pipeline 6 is connected to the hot water supply pipeline 2. This solution has a simple structure, with reasonable distribution of each pipeline, saving space and reducing costs.

[0076] Example 9

[0077] Based on Example 8, in this example, a flow transmitter 8 is fixedly installed on the hot water supply pipeline 2, and a temperature transmitter 9 is fixedly installed on the cold water supply pipeline 5.

[0078] This solution has a simple structure and reasonable design. The flow transmitter 8 is used to detect the hot water flow in the hot water supply pipeline 2, and at the same time, the temperature transmitter 9 can be used to detect the temperature of the cold water in the cold water supply pipeline 5.

[0079] It should be noted that the above-mentioned flow transmitter 8 and temperature transmitter 9 respectively adopt existing technologies, and their specific structures and principles will not be elaborated here.

[0080] Example 10

[0081] Based on the above embodiments, this embodiment also provides an automatic temperature washing control method for the sleeve crystallizer of a urea dewaxing device, which is implemented by using the above-mentioned automatic temperature washing control system for the sleeve crystallizer of a urea dewaxing device, and includes the following specific steps:

[0082] Verification of start-up conditions. If the verification of start-up conditions fails, the subsequent automatic temperature washing program is not allowed, and the verification of start-up conditions is continuously carried out until the verification passes;

[0083] After the condition verification passes, the cold water device is closed and the warm water device is started to perform temperature washing operations on the sleeve crystallizer;

[0084] After the temperature washing operation is completed, the warm water device is closed and the cold water device is started to perform normal urea dewaxing treatment operations.

[0085] This embodiment also provides an automatic temperature washing control method for the sleeve crystallizer of a urea dewaxing device. This control method is simple and reasonably designed, can realize the automatic temperature washing operation of the sleeve crystallizer, saves labor costs, improves production efficiency, can effectively solve the problem of uneven effects of manual temperature washing, and at the same time has a high safety level, avoiding the problem of overpressure of the sleeve crystallizer caused by improper manual operation.

[0086] Based on the above solution, the automatic temperature washing program in this embodiment includes the following steps:

[0087] 1. Startup condition verification.

[0088] 2. If the startup condition verification fails, the subsequent automatic warm wash program is not allowed, and the startup condition verification is continuously performed until it passes.

[0089] 3. After the verification passes, the relevant warm wash allow indicator lights on the DCS control system (equivalent to the controller) and the on-site control panel light up.

[0090] 4. After the operator presses the warm wash start button on the on-site control panel, the automatic warm wash program starts.

[0091] 5. The program closes / opens the relevant control valves and detects the valve position feedback. If the valve position feedback is correct, the program proceeds. If the valve position feedback is incorrect, the program terminates and alarms on the DCS control system.

[0092] 6. After all the shut-off valves are closed / opened in place, the program checks whether the warm wash hot water flow rate reaches the set value (20 t / h). If it reaches the set value, the relevant warm wash start indicator lights on the DCS control system and the on-site control panel light up, and the program proceeds. If it does not reach the set value, the warm wash flow rate too low indicator lights on the DCS control system and the on-site control panel light up.

[0093] 7. The program monitors whether the reaction product outlet temperature transmitter reaches the set value (60 °C). If it reaches the set value (60 °C), the relevant warm wash allow to close indicator lights on the DCS control system and the on-site control panel light up.

[0094] 8. After the operator presses the warm wash stop button on the on-site control panel, the warm wash shutdown program starts.

[0095] 9. Close / open the relevant shut-off valves and detect the valve position feedback. If the valve position feedback is correct, the program proceeds. If the valve position feedback is incorrect, the program terminates and alarms on the DCS control system.

[0096] 10. After all the shut-off valves are closed / opened in place, the program monitors whether the reaction product outlet temperature transmitter reaches the set value (40 °C). If it reaches the set value (40 °C), open the reaction product to sedimentation washing shut-off valve and detect the valve position feedback.

[0097] 11. After the reaction product to sedimentation washing shut-off valve is opened in place, the relevant warm wash stop indicator lights on the DCS control system and the on-site control panel light up, and the program ends.

[0098] The principle of warm wash control in the present invention is as follows:

[0099] 1. The warm wash program performs startup condition verification and detects whether all the following warm wash allow conditions are satisfied:

[0100] 1) The cold water supply shut-off valve is opened;

[0101] 2) The cold water return shut-off valve is opened;

[0102] 3) The hot water supply shut-off valve is closed;

[0103] 4) The hot water return shut-off valve is closed;

[0104] 5) The reaction product to sedimentation washing shut-off valve is opened;

[0105] 6) The reaction product outlet temperature < 30 °C; or the current I of the reaction circulation pump > 80 A; or the outlet pressure of the reaction circulation pump > 1.5 MPA.

[0106] 2. If the start-up condition verification fails, the subsequent automatic warm washing program is not allowed, and the start-up condition verification is continuously performed until it passes.

[0107] 3. After the verification passes, the relevant warm washing allow indicator lights on the DCS control system and the on-site control panel are lit.

[0108] 4. After the operator presses the warm washing start button on the on-site control panel, the automatic warm washing program starts.

[0109] 5. The program closes the cold water supply shut-off valve, the cold water return shut-off valve, and the reaction product to sedimentation washing shut-off valve, and detects the valve position feedback. If the valve position feedback is correct, the program proceeds. If the valve position feedback is incorrect, the program terminates and alarms on the DCS control system.

[0110] 6. The program opens the hot water supply shut-off valve, the hot water return shut-off valve, modulates the fresh feed valve opening to 100%, and detects the valve position feedback. If the valve position feedback is correct, the program proceeds. If the valve position feedback is incorrect, the program terminates and alarms on the DCS control system.

[0111] 7. The program checks whether the warm washing hot water flow rate reaches the set value (20 t / h). If it reaches the set value, the warm washing start indicator lights on the DCS control system and the on-site control panel are lit, the warm washing flow rate low indicator light is off, the warm washing allow indicator light is off, the allow warm washing off indicator light is off, and the warm washing stop indicator light is off, and the program proceeds. If it does not reach the set value, the warm washing flow rate very low indicator light on the DCS control system and the on-site control panel is lit.

[0112] 8. The program monitors whether the reaction product outlet temperature transmitter reaches the set value (60 °C). If it reaches the set value (60 °C), the relevant allow warm washing off indicator lights on the DCS control system and the on-site control panel are lit.

[0113] 9. After the operator presses the warm washing stop button on the on-site control panel, the warm washing shutdown program starts.

[0114] 10. The program closes the hot water supply cut-off valve and the hot water return cut-off valve, and detects the valve position feedback. If the valve position feedback is correct, the program proceeds. If the valve position feedback is incorrect, the program terminates and alarms on the DCS control system.

[0115] 11. The program opens the cold water supply cut-off valve and the cold water return cut-off valve, and detects the valve position feedback. If the valve position feedback is correct, the program proceeds. If the valve position feedback is incorrect, the program terminates and alarms on the DCS control system.

[0116] 12. The program checks whether the temperature of the reaction product outlet reaches the set value (40 °C). If it reaches the set value (40 °C), it opens the cut-off valve for the reaction product to sedimentation and washing, and detects the valve position feedback.

[0117] 13. After the cut-off valve for the reaction product to sedimentation and washing is fully opened, the temperature washing stop indicator light on the DCS control system and the on-site control panel lights up, the temperature washing start indicator light goes out, the temperature washing flow low indicator light lights up, the allow temperature washing indicator light goes out, and the allow close temperature washing indicator light goes out, and the program ends.

[0118] Compared with the prior art, the present invention has the following advantages:

[0119] 1. It can achieve automatic control and reach the function of automatic temperature washing.

[0120] 2. It saves labor costs and improves production efficiency.

[0121] 3. It can effectively solve the problem that the effects of manual temperature washing vary.

[0122] 4. It has a high degree of safety and avoids the problem of overpressure of the casing crystallizer caused by improper manual operation.

[0123] It should be noted that all the electronic components involved in the present invention adopt the prior art, and the above-mentioned components are electrically connected to the controller, and the control circuit between the controller and each component is the prior art.

[0124] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0125] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment contains only an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0126] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. An automatic temperature washing control system for the casing crystallizer of a urea dewaxing device, characterized in that: It includes a sleeve crystallizer (1), a controller, a cold water device and a hot water device. The cold water device and the hot water device are respectively connected to both ends of the sleeve crystallizer (1) through pipelines, and the cold water device and the hot water device are respectively communicatively connected to the controller.

2. The automatic temperature washing control system for the casing crystallizer of the urea dewaxing device according to claim 1, characterized in that: The hot water device includes a hot water supply pipeline (2). One end of the hot water supply pipeline (2) is connected to the water inlet end of the sleeve crystallizer (1), and the other end is used to connect to a hot water supply device; a hot water pump is fixedly installed on the hot water supply pipeline (2), and the hot water pump is communicatively connected to the controller.

3. The automatic temperature washing control system for the casing crystallizer of the urea dewaxing device according to claim 2, wherein: The hot water device further includes a hot water return pipeline (3). One end of the hot water return pipeline (3) is connected to the water outlet end of the sleeve crystallizer (1), and the other end is used to connect to a hot water return device.

4. The automatic warm washing control system for the casing crystallizer of the urea dewaxing device according to claim 3, characterized in that: Hot water valves (4) are respectively fixedly installed on the hot water supply pipeline (2) and / or the hot water return pipeline (3), and each hot water valve (4) is communicatively connected to the controller.

5. The automatic warm washing control system for the casing crystallizer of the urea dewaxing device according to any one of claims 2-4, characterized in that: The cold water device includes a cold water supply pipeline (5). One end of the cold water supply pipeline (5) is connected to the water inlet end of the sleeve crystallizer (1), and the other end is used to connect to a cold water supply device; a cold water pump is fixedly installed on the cold water supply pipeline (5), and the cold water pump is communicatively connected to the controller.

6. The automatic temperature washing control system for the casing crystallizer of the urea dewaxing device according to claim 5, characterized in that: The cold water device further includes a cold water return pipeline (6). One end of the cold water return pipeline (6) is connected to the water outlet end of the sleeve crystallizer (1), and the other end is used to connect to a cold water return device.

7. The automatic warm washing control system for the casing crystallizer of the urea dewaxing device according to claim 6, characterized in that: Cold water valves (7) are respectively fixedly installed on the cold water supply pipeline (5) and / or the cold water return pipeline (6), and each cold water valve (7) is communicatively connected to the controller.

8. The automatic temperature washing control system for the casing crystallizer of the urea dewaxing device according to claim 5, characterized in that: The water inlet end of the sleeve crystallizer (1) is connected to one end of a water inlet pipeline. One end of the hot water supply pipeline (2) is connected to the other end of the water inlet pipeline, and one end of the cold water supply pipeline (5) is connected to the hot water supply pipeline (2).

9. The automatic temperature washing control system for the casing crystallizer of the urea dewaxing device according to claim 8, characterized in that: A flow transmitter (8) is fixedly installed on the hot water supply pipeline (2), and a temperature transmitter (9) is fixedly installed on the cold water supply pipeline (5).

10. A method for automatically controlling warm washing of a casing crystallizer in a urea dewaxing device, characterized in that: It is realized by using the automatic temperature washing control system for the sleeve crystallizer of the urea dewaxing device as described in any one of claims 1 - 9, and includes the following specific steps: Verification of start-up conditions. If the verification of start-up conditions fails, the subsequent automatic temperature washing program is not allowed, and the verification of start-up conditions is continuously carried out until it passes. After the condition verification passes, the cold water device is closed and the warm water device is started to perform temperature washing operation on the sleeve crystallizer. After the temperature washing operation is completed, the warm water device is closed and the cold water device is started to perform normal urea dewaxing treatment operation.

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