A skid system with pipeline heat tracing control function and operation method

Abstract

The present invention provides a skid system and operation method with pipeline heat tracing control function, the skid system includes a raw material feeding unit, a heating medium feeding unit, a main jacket pipe, a user jacket pipe and a flow control unit, the main jacket pipe includes a main jacket inner pipe and a main jacket outer pipe, the user jacket pipe is led out from the main jacket pipe, and then connected back to the main jacket pipe through the user side, including at least one; the flow control unit is provided with a heating medium external pipe and a heating medium flow control valve, the former is led out from the main jacket outer pipe, and then connected back to the main jacket outer pipe. The present invention adopts a layout of main pipe + user branch pipe, which greatly reduces the total length of the pipeline, reduces the head, contributes to the uniform distribution and precise control of the heating medium, reduces the pressure drop and maintains uniformity, and avoids the problem of flow dead zone; through the setting of each flow control unit, the decoupling control of each user is realized, and the stability of the system is enhanced; the system has a reasonable layout and a flexible connection method, which can effectively reduce costs.

Description

Technical Field

[0001] The invention belongs to the technical field of fluid transportation, and relates to a skid system with pipeline heat tracing control function and an operation method. Background Art

[0002] In recent years, in order to save land and improve land and resource utilization, chemical projects have mostly adopted skid systems to achieve modularization and integration of functions. Therefore, it is easy to cause the distribution and connection of the pipe network in the skid system to be more complicated, especially the problem of heat supply and transportation is particularly prominent in the skid system. In the chemical skid system, chemical raw materials usually need to be transported to the user side through the pipe network in the skid. In order to meet the user's required temperature, it is often necessary to set up a jacket for heating. For high-viscosity raw materials, heating is also required to ensure fluidity and facilitate the measurement of pressure and flow data. Therefore, for the transportation of high-temperature raw materials or high-viscosity raw materials in the chemical skid system, it is necessary to set up jacketed heating pipes along each user side. This method requires the configuration of long-distance jacketed heating pipes and heat pumps, and the investment and operation costs are high.

[0003] Since the skid system usually involves multiple users, each of which can operate independently, when a user stops for maintenance, the load of the heating pipe network will change, and the temperature of the downstream users will fluctuate in a chain reaction that is difficult to adjust, which will affect the stability of the entire skid system. In addition, during operation, due to the complexity of the pipelines and the different pressure drops in various parts of the pipeline network, the heating medium is prone to uneven distribution. If the heating medium is insufficient in some areas, the raw material temperature will drop, high-viscosity raw materials will have flow dead zones, and the instrument measurement data will be inaccurate, which will seriously affect the safe operation of the skid system. Therefore, the heating pipelines in the skid system need to be reasonably planned and allocated according to the user's side conditions.

[0004] CN 207740619U discloses a high-viscosity oil delivery pipeline heating device, which includes a heater, a water pump and a heat transfer sleeve, wherein the heater and the water pump are connected through a pipeline, the heat transfer sleeve is sleeved on the outside of the delivery pipeline and is provided with a water storage cavity; two interfaces are provided on the circumference of the outer wall of the heat transfer sleeve, which are respectively connected to the heater and the water pump through water pipes, and limiters are provided at both ends of the heat transfer sleeve to limit its sliding along the delivery pipeline. The device achieves heat preservation of high-viscosity oil in the delivery pipeline by setting a heat transfer sleeve, but only discloses the heating of raw oil during transportation in the pipeline, and does not clarify the connection conditions when multiple users are used, and has poor applicability in a skid system with a complex pipe network structure.

[0005] CN 217802726U discloses a conveying system suitable for high-viscosity polyester plasticizers, which includes a raw material iron barrel, a plunger pump, a heater, a transition silo, a heating jacket, and a circulating gear pump. In the system, the plunger pump is arranged in the raw material iron barrel, the heater is arranged at the bottom of the raw material iron barrel, the plunger pump discharge port is connected to the feed port of the transition silo through an intermediate pipeline, the transition silo is arranged in the heating jacket, and the transition silo discharge port is sent to each production line through a circulating gear pump and a production line material pipeline. This patent increases the temperature of high-viscosity raw materials and realizes stable conveying by setting a heating jacket outside the transition silo, but it is also only conveying in the pipeline. The pipeline distribution method is not clear for multi-user applications, and the full pipeline heating of the raw materials is not disclosed.

[0006] In summary, the setting of heating pipes in the skid system needs to be reasonably distributed according to the application situation to ensure that the raw materials are heated evenly and meet the application requirements of each user side. At the same time, the length of the heating pipes should be minimized to avoid the occurrence of flow dead zones. Summary of the invention

[0007] In view of the problems existing in the prior art, the purpose of the present invention is to provide a skid system and an operating method with a pipeline heating control function. The skid system can greatly reduce the length of the pipeline by adopting a layout of a main pipe and user pipes, and can achieve precise control of the flow of the heating medium, distribute it evenly, reduce the pressure drop and maintain uniformity, effectively solve the problem of flow dead zones, and enhance the stability of the system through decoupling control between users.

[0008] To achieve the above object, the present invention adopts the following technical solutions:

[0009] On the one hand, the present invention provides a skid system with pipeline heating control function, the skid system includes a raw material feeding unit, a heating medium feeding unit, a main jacket pipe, a user jacket pipe and a flow control unit, the main jacket pipe includes a main jacket inner pipe and a main jacket outer pipe, the raw material feeding unit is connected to the main jacket inner pipe, the heating medium feeding unit is connected to the main jacket outer pipe, the user jacket pipe is a branch pipeline led out from the main jacket pipe, and is connected back to the main jacket pipe through the user side, and the user jacket pipe includes at least one branch; the flow control unit is arranged on the main jacket pipe at a position parallel to the user jacket pipe, and includes a heating medium external pipe and a heating medium flow control valve, the heating medium external pipe is led out from the main jacket outer pipe, and is connected back to the main jacket outer pipe through the heating medium flow control valve.

[0010] In the present invention, for the pipeline layout in the skid system, a main pipe + user branch layout is adopted to replace the traditional full-user layout, which can greatly reduce the total length of the pipeline, reduce the head of the conveying equipment, and thus reduce the project investment; at the same time, this layout is conducive to the uniform distribution and precise control of the heating medium in each pipeline, reduce the pressure drop and maintain uniformity, and avoid the problem of flow dead zone; through the setting of the flow control unit corresponding to each user side, the decoupling control of each user is realized, and the use of other users is avoided due to the parking of a user or the change of heating demand, the stability of the system operation is enhanced, and the temperature of the raw materials on the user side is adjusted by controlling the flow of the heating medium; the system has a reasonable layout and a flexible connection method, which can effectively save investment and reduce costs.

[0011] The following are preferred technical solutions of the present invention, but are not intended to be limitations of the technical solutions provided by the present invention. Through the following technical solutions, the technical objectives and beneficial effects of the present invention can be better achieved and realized.

[0012] As a preferred technical solution of the present invention, the raw material feeding unit includes a raw material storage tank and a raw material delivery pump, and the raw material storage tank is connected to the main jacket inner pipe via the raw material delivery pump.

[0013] Preferably, the heating medium feeding unit comprises a heating medium storage tank, a heating medium delivery pump and a heating medium preheater, and the heating medium storage tank is connected to the main jacket outer pipe via the heating medium delivery pump and the heating medium preheater in sequence.

[0014] In the present invention, the type of the heating medium preheater can be an electric heater, a steam heat exchanger, etc., that is, the preheating of the heating medium can be carried out by electric heating, steam heating, etc., and different heating powers are selected according to the type of heating medium and the required temperature.

[0015] As a preferred technical solution of the present invention, the main jacket pipe is the main pipeline in the skid system, the end of the main jacket inner pipe is connected back to the raw material storage tank, and the end of the main jacket outer pipe is connected back to the heating medium storage tank.

[0016] Preferably, the user jacket pipe comprises a user jacket inner pipe and a user jacket outer pipe, which respectively transport the raw material and the heating medium.

[0017] Preferably, the location where the user jacket tube is connected to the main jacket tube is a user interface, and each user jacket tube has two user interfaces.

[0018] Preferably, the user jacket pipe is divided into a user jacket inlet pipe and a user jacket outlet pipe, both of which are connected to the main jacket pipe through a user interface.

[0019] Preferably, the user jacket pipe is provided with a user flow cut-off valve, preferably arranged on the user jacket inlet pipe.

[0020] In the present invention, each user is connected to two corresponding user interfaces through a user jacket inlet pipe and a user jacket outflow pipe, wherein the user jacket inlet pipe is provided with a user flow cut-off valve; the user interface simultaneously transports raw materials and heating medium in the form of a jacket, and the user flow cut-off valve can simultaneously cut off the transportation of raw materials and heating medium in the user jacket pipe.

[0021] As a preferred technical solution of the present invention, the flow control unit is a heating medium flow control unit.

[0022] Preferably, a group of heating medium flow control units is provided on the main jacket pipe between two user interfaces corresponding to one user jacket pipe.

[0023] Preferably, two heating medium interfaces are provided corresponding to the position where the heating medium external pipe is connected to the main jacket outer pipe.

[0024] Preferably, the outer pipe of the main jacket between the two heating medium interfaces is blocked or isolated.

[0025] In the present invention, the flow control unit is located between two user interfaces, and the total jacket outer tube in the flow control unit is provided with two heating medium interfaces, which are connected to the heating medium flow control valve through the heating medium external pipe. The heating medium interface only transports the heating medium, and the corresponding heating medium flow control valve only controls the flow transport of the heating medium. The jacket space between the two heating medium interfaces limits the circulation of the heating medium by welding or the like.

[0026] Preferably, the flow control unit is interlocked with the heating medium delivery pump and the heating medium preheater.

[0027] In the present invention, interlocking control is implemented between the heating medium delivery pump, the heating medium preheater and the flow control unit; when the user side starts or stops or the operating conditions fluctuate, the temperature and flow of the overall heating medium are controlled by controlling the power of the heating medium preheater and the flow of the heating medium delivery pump, and the temperature and flow of the heating medium on a single user side are controlled by adjusting each flow control unit.

[0028] In another aspect, the present invention provides an operating method of the above-mentioned skid system, the operating method comprising the following steps:

[0029] (1) The raw material is transported to the inner pipe of the main jacket, and the heating medium is heated and then transported to the outer pipe of the main jacket. The raw material and the heating medium flow into each user side, and then flow out and return to the main jacket pipe;

[0030] (2) When a user side operates normally, the raw material and the heating medium are divided into two streams, flowing along the main jacket pipe and the user jacket pipe respectively. When passing through the heating medium flow control unit on the main jacket pipe corresponding to the user jacket pipe, the heating medium flows along the heating medium external pipe and adjusts the heating medium flow through the heating medium external pipe;

[0031] (3) When a user side stops operating, the raw materials and heating medium no longer flow to the corresponding user jacket pipe, but all flow through the main jacket pipe, wherein the raw materials all flow through the main jacket inner pipe, and the heating medium all flows through the corresponding heating medium external pipe in the heating medium flow control unit.

[0032] In the present invention, the raw materials are consumed when used on the user side and used for production activities, and the remaining raw materials are returned to the inner tube of the total jacket. When the temperature of the inner tube of the total jacket fluctuates significantly due to changes in operating conditions, the temperature of the total jacket is kept up to standard by adjusting the delivery flow rate of the heating medium.

[0033] As a preferred technical solution of the present invention, the raw materials in step (1) include high-temperature raw materials and / or high-viscosity raw materials.

[0034] Preferably, the temperature of the high-temperature raw material is 50-350°C, for example, 50°C, 100°C, 150°C, 200°C, 250°C, 300°C or 350°C, etc., but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable. The viscosity of the high-viscosity raw material is above 300mP·s, for example, 300mP·s, 350mP·s, 400mP·s, 450mP·s, 500mP·s, 600mP·s, 700mP·s, 800mP·s or 1000mP·s, etc., but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0035] In the present invention, the high-temperature raw material refers to the raw material that needs to maintain a high temperature during the transportation process, and the temperature of the raw material is maintained basically constant by the heat exchange medium; and the high-viscosity raw material refers to the raw material that causes a flow dead zone due to insufficient insulation measures. For example, the diethanolamine raw material can maintain good flow at the operating temperature. Based on the environmental conditions of pipeline transportation, if the temperature drops, a flow dead zone may appear.

[0036] Preferably, the heating medium in step (1) includes any one of heat transfer oil, steam or water.

[0037] Preferably, the temperature of the heating medium after heating in step (1) is 50-350°C, for example, 50°C, 70°C, 80°C, 100°C, 120°C, 140°C, 160°C, 180°C, 200°C, 220°C, 240°C, 260°C, 280°C, 300°C, 320°C or 350°C, etc., but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0038] In the present invention, depending on the type of heating medium, the temperature usually selected as the heat source will also be different. Specifically, when heat transfer oil is selected, the temperature after heating is 180-350°C, when steam is selected, the temperature after heating is 120-180°C, and when water is selected, the temperature after heating is 50-120°C.

[0039] As a preferred technical solution of the present invention, the user sides in step (1) are arranged sequentially along the main jacket pipe, and different user sides are arranged independently or in association.

[0040] Preferably, after the raw materials and heating medium return to the main jacket pipe, they continue to be used on the subsequent user side until there is no user side, and the raw materials return to the raw material storage tank, and the heating medium returns to the heating medium storage tank for recycling.

[0041] In the present invention, according to the temperature feedback data on the user side, the flow control unit is linked to accurately control the flow of the heating medium flowing through the user, thereby realizing automatic adjustment of the raw material temperature on the user side.

[0042] As a preferred technical solution of the present invention, when the user side in step (2) operates normally, the user flow cut-off valve on the user jacket pipe is opened.

[0043] Preferably, when the user side in step (2) operates normally, the flow of the heating medium flowing through the heating medium external pipe is adjusted by controlling the opening of the heating medium flow control valve in the heating medium flow control unit, thereby indirectly adjusting the heating medium flow entering the user jacket pipe.

[0044] Preferably, when the user side in step (2) operates normally, the opening of the heating medium flow control valve is 0 to 80%, for example, 0, 10%, 20%, 30%, 40%, 50%, 60%, 70% or 80%, etc., but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0045] In the present invention, when the user side operates normally, the medium flow entering the user jacket pipe is indirectly adjusted by controlling the opening of the heating medium flow control valve, and the heat exchange between the heating medium and the raw material is further adjusted to achieve the purpose of controlling the raw material temperature in the user jacket pipe.

[0046] As a preferred technical solution of the present invention, when the user side stops operating in step (3), the user flow cut-off valve on the user jacket pipe is closed.

[0047] Preferably, when the user side of step (3) is suspended, the raw materials and heating medium all flow along the main jacket pipe, and the opening of the heating medium flow control valve is 60-100%, for example, 60%, 70%, 75%, 80%, 85%, 90%, 95% or 100%, etc., but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable, preferably with an opening of 100%.

[0048] As a preferred technical solution of the present invention, decoupling control is performed between each user side, and adjusting the medium flow corresponding to the upper-level user side does not affect the use of the lower-level users.

[0049] In the present invention, through the flow control unit corresponding to each user, the heating load of the user with changed working conditions is modified in a targeted manner without affecting the downstream users, thereby completing the control decoupling of each user. When multiple users start or stop or the heating load demand changes, the heating medium delivery pump, the heating medium preheater and the flow control unit can be combined to achieve comprehensive control to ensure the stability of the heating load demand of each user in the system.

[0050] Preferably, under the condition that the heating medium load meets the simultaneous supply of multiple user sides, the layout of the user side is selected according to whether the starting and stopping conditions of each user side are related. If there is a chain, the series method is adopted; if there is no correlation, the parallel method is adopted.

[0051] In the present invention, each user can select a series or parallel connection mode on the user pipe according to the start-stop frequency and heat load condition, thereby reducing the pipe usage.

[0052] Preferably, among the user sides, some of the user sides are arranged in series, and then the whole is arranged in parallel with other user sides.

[0053] In the present invention, when there is a linkage between the start and stop conditions of multiple users and the heating medium load satisfies the simultaneous supply of multiple users, a multi-user series mode is adopted; when there is no connection between the start and stop conditions of multiple users, but the heating medium load satisfies the simultaneous supply of multiple users, a multi-user parallel mode is adopted.

[0054] Compared with the prior art, the present invention has the following beneficial effects:

[0055] (1) The skid system of the present invention adopts a layout of main pipe + user sub-pipe, replacing the traditional all-user layout, which can greatly reduce the total length of the pipeline, reduce the head of the conveying equipment, and thus reduce the project investment;

[0056] (2) The pipeline layout in the skid system of the present invention helps to evenly distribute and accurately control the heating medium in each pipeline, reduce the pressure drop and maintain uniformity, and avoid the problem of flow dead zone;

[0057] (3) The present invention realizes decoupling control of each user by setting a flow control unit corresponding to each user side, avoiding affecting the use of other users due to parking of a user or change in heating demand, enhancing the stability of system operation, and realizing automatic adjustment of raw material temperature on the user side by controlling the flow of heating medium;

[0058] (4) The system of the present invention has a reasonable layout and a flexible connection method, which can effectively save investment and reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 is a schematic diagram of the structure of a skid system with a pipeline heat tracing control function provided in Example 1 of the present invention;

[0060] Figure 2 is a schematic diagram of the structure of a flow control unit provided in Example 1 of the present invention;

[0061] Among them, 1-raw material storage tank, 2-raw material delivery pump, 3-heating medium storage tank, 4-heating medium delivery pump, 5-heating medium preheater, 6-total jacket pipe, 61-total jacket inner pipe, 62-total jacket outer pipe, 7-user jacket pipe, 8-user flow cut-off valve, 9-flow control unit, 91-heating medium external pipe, 92-heating medium flow control valve. DETAILED DESCRIPTION

[0062] In order to better illustrate the present invention and facilitate understanding of the technical solution of the present invention, the present invention is further described in detail below. However, the following embodiments are only simple examples of the present invention and do not represent or limit the scope of protection of the present invention. The scope of protection of the present invention shall be subject to the claims.

[0063] The following are typical but non-limiting embodiments of the present invention:

[0064] Embodiment 1:

[0065] This embodiment provides a skid system with a pipeline heat tracing control function. The schematic diagram of the skid system is as follows: Figure 1As shown, it includes a raw material feeding unit, a heating medium feeding unit, a main jacket pipe 6, a user jacket pipe 7 and a flow control unit 9, the main jacket pipe 6 includes a main jacket inner pipe 61 and a main jacket outer pipe 62, the raw material feeding unit is connected to the main jacket inner pipe 61, the heating medium feeding unit is connected to the main jacket outer pipe 62, the user jacket pipe 7 is a branch pipeline led out from the main jacket pipe 6, and is connected back to the main jacket pipe 6 through the user side, and the user jacket pipe 7 includes three branches; the flow control unit 9 is arranged on the main jacket pipe 6 and is parallel to the user jacket pipe 7, and its structural schematic diagram is shown as follows Figure 2 As shown, it includes a heating medium external pipe 91 and a heating medium flow control valve 92 . The heating medium external pipe 91 is led out from the main jacket outer pipe 62 , passes through the heating medium flow control valve 92 and is then connected back to the main jacket outer pipe 62 .

[0066] The raw material feeding unit includes a raw material storage tank 1 and a raw material delivery pump 2 , and the raw material storage tank 1 is connected to the main jacket inner pipe 61 via the raw material delivery pump 2 .

[0067] The heating medium feeding unit comprises a heating medium storage tank 3 , a heating medium delivery pump 4 and a heating medium preheater 5 , and the heating medium storage tank 3 is connected to the main jacket outer pipe 62 via the heating medium delivery pump 4 and the heating medium preheater 5 in sequence.

[0068] The heating medium preheater 5 is a steam heat exchanger.

[0069] The main jacket pipe 6 is the main pipeline in the skid system. The end of the main jacket inner pipe 61 is connected back to the raw material storage tank 1 , and the end of the main jacket outer pipe 62 is connected back to the heating medium storage tank 3 .

[0070] The user jacket pipe 7 comprises a user jacket inner pipe and a user jacket outer pipe, which respectively transport raw materials and heating medium.

[0071] The position where the user jacket tube 7 is connected to the main jacket tube 6 is a user interface, and each user jacket tube 7 has two user interfaces.

[0072] The user jacket pipe 7 is divided into a user jacket inlet pipe and a user jacket outlet pipe, both of which are connected to the main jacket pipe 6 through a user interface.

[0073] The user jacket pipe 7 is provided with a user flow cut-off valve 8, which is arranged on the user jacket inlet pipe.

[0074] A group of heating medium flow control units 9 is provided on the main jacket pipe 6 between two user interfaces corresponding to a user jacket pipe 7 .

[0075] There are four on the user side. One heating medium flow control unit 9 is set corresponding to user 1, and users 2 and 3 are set in series and in parallel with user 4. One heating medium flow control unit 9 is set corresponding to the three.

[0076] Two heating medium interfaces are correspondingly provided at the position where the heating medium external pipe 91 is connected to the main jacket outer pipe 62, and the main jacket outer pipe 62 between the two heating medium interfaces is blocked.

[0077] The flow control unit 9 is interlocked with the heating medium delivery pump 4 and the heating medium preheater 5 for control.

[0078] Embodiment 2:

[0079] The present embodiment provides a skid system with pipeline heating control function, the skid system includes a raw material feeding unit, a heating medium feeding unit, a main jacket pipe 6, a user jacket pipe 7 and a flow control unit 9, the main jacket pipe 6 includes a main jacket inner pipe 61 and a main jacket outer pipe 62, the raw material feeding unit is connected to the main jacket inner pipe 61, the heating medium feeding unit is connected to the main jacket outer pipe 62, the user jacket pipe 7 is a branch pipeline led out from the main jacket pipe 6, and is connected back to the main jacket pipe 6 through the user side, and the user jacket pipe 7 includes four branches; the flow control unit 9 is arranged on the main jacket pipe 6 at a position parallel to the user jacket pipe 7, and includes a heating medium external pipe 91 and a heating medium flow control valve 92, the heating medium external pipe 91 is led out from the main jacket outer pipe 62, and is connected back to the main jacket outer pipe 62 through the heating medium flow control valve 92.

[0080] The raw material feeding unit includes a raw material storage tank 1 and a raw material delivery pump 2 , and the raw material storage tank 1 is connected to the main jacket inner pipe 61 via the raw material delivery pump 2 .

[0081] The heating medium feeding unit comprises a heating medium storage tank 3 , a heating medium delivery pump 4 and a heating medium preheater 5 , and the heating medium storage tank 3 is connected to the main jacket outer pipe 62 via the heating medium delivery pump 4 and the heating medium preheater 5 in sequence.

[0082] The heating medium preheater 5 is an electric heater.

[0083] The main jacket pipe 6 is the main pipeline in the skid system. The end of the main jacket inner pipe 61 is connected back to the raw material storage tank 1 , and the end of the main jacket outer pipe 62 is connected back to the heating medium storage tank 3 .

[0084] The user jacket pipe 7 comprises a user jacket inner pipe and a user jacket outer pipe, which respectively transport raw materials and heating medium.

[0085] The position where the user jacket tube 7 is connected to the main jacket tube 6 is a user interface, and each user jacket tube 7 has two user interfaces.

[0086] The user jacket pipe 7 is divided into a user jacket inlet pipe and a user jacket outlet pipe, both of which are connected to the main jacket pipe 6 through a user interface.

[0087] The user jacket pipe 7 is provided with a user flow cut-off valve 8, which is arranged on the user jacket inlet pipe.

[0088] A group of heating medium flow control units 9 is provided on the main jacket pipe 6 between two user interfaces corresponding to a user jacket pipe 7 .

[0089] The user side is provided with three heating medium flow control units 9 , wherein user 1 is provided with a heating medium flow control unit 9 correspondingly, and user 2 and user 3 are provided in series, and both are provided with a heating medium flow control unit 9 correspondingly.

[0090] Two heating medium interfaces are correspondingly provided at the position where the heating medium external pipe 91 is connected to the main jacket outer pipe 62, and the main jacket outer pipe 62 is separated between the two heating medium interfaces.

[0091] The flow control unit 9 is interlocked with the heating medium delivery pump 4 and the heating medium preheater 5 for control.

[0092] Embodiment 3:

[0093] This embodiment provides an operation system of a skid system with a pipeline heat tracing control function. The skid system adopts the system in Embodiment 1, and includes the following steps:

[0094] (1) The high-temperature raw material adipic acid is transported to the main jacket inner pipe 61, the initial temperature of the raw material is 280°C, the heating medium heat transfer oil is heated to 300°C and then transported to the main jacket outer pipe 62, the raw material and the heating medium flow into each user side, and then flow out back to the main jacket pipe 6, and continue to be used for subsequent user sides, until there is no user side, the raw material returns to the raw material storage tank 1, and the heating medium returns to the heating medium storage tank 3 for recycling;

[0095] (2) When a user side operates normally, the raw material and the heating medium are divided into two streams, flowing along the main jacket pipe 6 and the user jacket pipe 7 respectively. The user flow cut-off valve 8 on the user jacket pipe 7 is opened. When the heating medium passes through the heating medium flow control unit 9 on the main jacket pipe 6 corresponding to the user jacket pipe 7, the heating medium flows along the heating medium external pipe 91. The opening of the heating medium flow control valve 92 in the heating medium flow control unit 9 is controlled to adjust the heating medium flow through the heating medium external pipe 91.

[0096] (3) When a user side stops operating, the user flow cut-off valve 8 on the user jacket pipe 7 is closed, and the raw material and the heating medium no longer flow to the corresponding user jacket pipe 7, and all flow through the main jacket pipe 6, wherein the raw material all flows through the main jacket inner pipe 61, and the heating medium all flows through the heating medium external pipe 91 in the corresponding heating medium flow control unit 9.

[0097] In the user side of this embodiment, user 1 is set separately, user 2 and user 3 are connected in series, and user 4 is connected in parallel with user 2 and user 3. Under different operating conditions, the temperature and flow rate of the total jacket pipe and the heating medium on each user side are shown in Table 1.

[0098] Table 1

[0099]

[0100]

[0101] Embodiment 4:

[0102] This embodiment provides an operation system of a skid system with a pipeline heat tracing control function. The skid system adopts the system in Embodiment 1, and includes the following steps:

[0103] (1) High-viscosity raw material diethanolamine is transported to the main jacket inner pipe 61, the initial temperature of the raw material is 160° C. The heating medium steam is heated to 180° C. and then transported to the main jacket outer pipe 62. The raw material and the heating medium flow into each user side, and then flow out back to the main jacket pipe 6 to continue to be used for subsequent user sides. When there is no user side, the raw material returns to the raw material storage tank 1, and the heating medium returns to the heating medium storage tank 3 for recycling;

[0104] (2) When a user side operates normally, the raw material and the heating medium are divided into two streams, flowing along the main jacket pipe 6 and the user jacket pipe 7 respectively. The user flow cut-off valve 8 on the user jacket pipe 7 is opened. When the heating medium passes through the heating medium flow control unit 9 on the main jacket pipe 6 corresponding to the user jacket pipe 7, the heating medium flows along the heating medium external pipe 91. The opening of the heating medium flow control valve 92 in the heating medium flow control unit 9 is controlled to adjust the heating medium flow through the heating medium external pipe 91.

[0105] (3) When a user side stops running, the user flow cut-off valve 8 on the user jacket pipe 7 is closed, and the raw material and the heating medium no longer flow to the corresponding user jacket pipe 7, and all flow through the main jacket pipe 6, wherein the raw material all flows through the main jacket inner pipe 61, and the heating medium all flows through the heating medium external pipe 91 in the corresponding heating medium flow control unit 9;

[0106] In the user side of this embodiment, user 1 is set separately, user 2 and user 3 are connected in series, and user 4 is connected in parallel with user 2 and user 3. Under different operating conditions, the temperature and flow rate of the total jacket pipe and the heating medium on each user side are shown in Table 2.

[0107] Table 2

[0108]

[0109]

[0110] Embodiment 5:

[0111] This embodiment provides an operation system of a skid system with a pipeline heat tracing control function. The skid system adopts the system in Embodiment 1, and includes the following steps:

[0112] (1) The raw material acetic acid is transported to the main jacket inner pipe 61, the initial temperature of the raw material is 60° C. The heating medium hot water is heated to 80° C. and then transported to the main jacket outer pipe 62. The raw material and the heating medium flow into each user side, and then flow out back to the main jacket pipe 6 to continue to be used for subsequent user sides. When there is no user side, the raw material returns to the raw material storage tank 1, and the heating medium returns to the heating medium storage tank 3 for recycling;

[0113] (2) When a user side operates normally, the raw material and the heating medium are divided into two streams, flowing along the main jacket pipe 6 and the user jacket pipe 7 respectively. The user flow cut-off valve 8 on the user jacket pipe 7 is opened. When the heating medium passes through the heating medium flow control unit 9 on the main jacket pipe 6 corresponding to the user jacket pipe 7, the heating medium flows along the heating medium external pipe 91. The opening of the heating medium flow control valve 92 in the heating medium flow control unit 9 is controlled to adjust the heating medium flow through the heating medium external pipe 91.

[0114] (3) When a user side stops operating, the user flow cut-off valve 8 on the user jacket pipe 7 is closed, and the raw material and the heating medium no longer flow to the corresponding user jacket pipe 7, and all flow through the main jacket pipe 6, wherein the raw material all flows through the main jacket inner pipe 61, and the heating medium all flows through the heating medium external pipe 91 in the corresponding heating medium flow control unit 9.

[0115] In the user side of this embodiment, user 1 is set separately, user 2 and user 3 are connected in series, and user 4 is connected in parallel with user 2 and user 3. Under different operating conditions, the temperature and flow rate of the total jacket pipe and the heating medium on each user side are shown in Table 3.

[0116] Table 3

[0117]

[0118]

[0119] According to Tables 1, 2 and 3 above, when the flow control unit corresponding to user 1 is adjusted, the heating medium flow and temperature corresponding to downstream users 2, 3 and 4 are not affected; the start and stop conditions of users 2 and 3 are interlocked, and the overall heating load demand is relatively low, so the pipeline network is arranged in series to reduce the length of the pipeline layout; the start and stop time of user 4 is inconsistent with that of users 2 and 3, but the heating load of the pipeline network meets the requirements of simultaneous operation of users 2, 3 and 4, so user 4 is arranged in parallel with users 2 and 3 to reduce the length of the pipeline layout and the number of flow control units; when users 2 and 3 are deactivated, the overall heat load is reduced, which is specifically manifested in the increase in the temperature of the heating medium when it reaches user 4, so the demand flow of user 4 is reduced, and the total heating medium temperature increases after being used by the entire users 1-4, and the heat load required for reheating to the demand is reduced; similarly, when user 4 is deactivated, the demand flow of users 2 and 3 can also be reduced.

[0120] Based on the above embodiments, it can be concluded that the skid system of the present invention adopts a layout of main pipe + user branch pipes, replacing the traditional full-user layout, which can greatly reduce the total length of the pipeline, reduce the head of the conveying equipment, and thus reduce the project investment; the pipeline layout in the skid system is conducive to the uniform distribution and precise control of the heating medium in each pipeline, reducing the pressure drop and maintaining uniformity, and avoiding the problem of flow dead zone; through the setting of the flow control unit corresponding to each user side, the decoupling control of each user is realized, avoiding the use of other users affected by the parking of a user or the change of heating demand, enhancing the stability of the system operation, and realizing the automatic adjustment of the raw material temperature on the user side by controlling the flow of the heating medium; the system has a reasonable layout and a flexible connection method, which can effectively save investment and reduce costs.

[0121] The applicant declares that the present invention uses the above embodiments to illustrate the detailed devices and methods of the present invention, but the present invention is not limited to the above detailed devices and methods, that is, it does not mean that the present invention must rely on the above detailed devices and methods to be implemented. Those skilled in the art should understand that any improvement of the present invention, equivalent replacement of the device of the present invention, addition of auxiliary devices, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

Claims

1. A skid system with pipeline heat tracing control function, characterized in that: The skid system includes a raw material feeding unit, a heating medium feeding unit, a main jacket pipe, a user jacket pipe and a flow control unit. The main jacket pipe includes a main jacket inner pipe and a main jacket outer pipe. The raw material feeding unit is connected to the main jacket inner pipe, the heating medium feeding unit is connected to the main jacket outer pipe, the user jacket pipe is a branch pipeline led out from the main jacket pipe, and is connected back to the main jacket pipe through the user side. The user jacket pipe includes at least one branch. The flow control unit is arranged on the main jacket pipe at a position parallel to the user jacket pipe, and includes a heating medium external pipe and a heating medium flow control valve. The heating medium external pipe is led out from the main jacket outer pipe, and is connected back to the main jacket outer pipe through the heating medium flow control valve. Two heating medium interfaces are provided corresponding to the position where the heating medium external pipe is connected to the main jacket outer pipe; The outer pipe of the main jacket between the two heating medium interfaces is blocked or isolated; The flow control unit is interlocked with the heating medium delivery pump and the heating medium preheater for control.

2. The skid system according to claim 1, characterized in that: The raw material feeding unit comprises a raw material storage tank and a raw material delivery pump, and the raw material storage tank is connected to the main jacket inner pipe via the raw material delivery pump.

3. The skid system according to claim 1, characterized in that: The heating medium feeding unit comprises a heating medium storage tank, a heating medium delivery pump and a heating medium preheater, and the heating medium storage tank is connected to the main jacket outer pipe through the heating medium delivery pump and the heating medium preheater in sequence.

4. The skid system according to claim 1, characterized in that: The main jacket pipe is the main pipeline in the skid system, the end of the main jacket inner pipe is connected back to the raw material storage tank, and the end of the main jacket outer pipe is connected back to the heating medium storage tank.

5. The skid system according to claim 1, characterized in that: The user jacket pipe comprises a user jacket inner pipe and a user jacket outer pipe, which respectively transport raw materials and heating medium.

6. The skid system according to claim 1, characterized in that: The position where the user jacket pipe is connected to the main jacket pipe is a user interface, and each user jacket pipe has two user interfaces.

7. The skid system according to claim 1, characterized in that: The user jacket pipe is divided into a user jacket inlet pipe and a user jacket outlet pipe, both of which are connected to the main jacket pipe through a user interface.

8. The skid system according to claim 1, characterized in that: The user jacket pipes are all provided with user flow cut-off valves.

9. The skid system according to claim 8, characterized in that: The user flow cut-off valve is arranged on the user jacket inflow pipe.

10. The skid system according to claim 1, characterized in that: The flow control unit is a heating medium flow control unit.

11. The skid system according to claim 1, characterized in that: A group of heating medium flow control units is arranged on the main jacket pipe between two user interfaces corresponding to one user jacket pipe.

12. The method for operating the skid system according to any one of claims 1 to 11, characterized in that: The operation method comprises the following steps: (1) The raw material is transported to the inner pipe of the main jacket, and the heating medium is heated and then transported to the outer pipe of the main jacket. The raw material and the heating medium flow into each user side, and then flow out and return to the main jacket pipe; (2) When a user side operates normally, the raw material and the heating medium are divided into two streams, flowing along the main jacket pipe and the user jacket pipe respectively. When passing through the heating medium flow control unit on the main jacket pipe corresponding to the user jacket pipe, the heating medium flows along the heating medium external pipe and adjusts the heating medium flow through the heating medium external pipe; (3) When a user side stops operating, the raw materials and heating medium no longer flow to the corresponding user jacket pipe, but all flow through the main jacket pipe, among which the raw materials all flow through the main jacket inner pipe, and the heating medium all flows through the corresponding heating medium external pipe in the heating medium flow control unit.

13. The operating method according to claim 12, characterized in that: The raw materials in step (1) include high-temperature raw materials and / or high-viscosity raw materials.

14. The operating method according to claim 13, characterized in that: The temperature of the high-temperature raw material is 50-350° C., and the viscosity of the high-viscosity raw material is above 300 mP·s.

15. The operating method according to claim 12, characterized in that: The heating medium in step (1) includes any one of heat transfer oil, steam or water.

16. The operating method according to claim 12, characterized in that: The temperature of the heating medium after heating in step (1) is 50~350℃.

17. The operating method according to claim 12, characterized in that: The user sides in step (1) are arranged in sequence along the main jacket pipe, and different user sides are arranged independently or in association.

18. The operating method according to claim 12, characterized in that: After the raw materials and heating medium return to the main jacket pipe, they continue to be used on the subsequent user side until there is no user side, at which time the raw materials return to the raw material storage tank and the heating medium returns to the heating medium storage tank for recycling.

19. The operating method according to claim 12, characterized in that: When the user side of step (2) operates normally, the user flow cut-off valve on the user jacket pipe is opened.

20. The operating method according to claim 12, characterized in that: When the user side of step (2) operates normally, the flow of the heating medium flowing through the heating medium external pipe is adjusted by controlling the opening of the heating medium flow control valve in the heating medium flow control unit, thereby indirectly adjusting the flow of the heating medium entering the user jacket pipe.

21. The operating method according to claim 12, characterized in that: When the user side of step (3) stops operating, the user flow cut-off valve on the user jacket pipe is closed.

22. The operating method according to claim 12, characterized in that: When the user side of step (3) stops operating, the raw materials and heating medium all flow along the main jacket pipe.

23. The operating method according to claim 12, characterized in that: Decoupling control is implemented between each user side, and adjusting the media flow corresponding to the upper-level user side does not affect the use of the lower-level users.

24. The operating method according to claim 23, characterized in that: Under the condition that the heating medium load meets the simultaneous supply of multiple user sides, the layout method of the user side is selected according to whether the start-stop conditions of each user side are related; if there is an interlocking, the series method is adopted, if there is no correlation, the parallel method is adopted.

25. The operating method according to claim 24, characterized in that: Among the user sides, some of the associated user sides are first arranged in series, and then the whole is arranged in parallel with other user sides.

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