A new type of high-pressure hydrogenation reaction heat exchanger parallel device

Abstract

The utility model discloses a novel high pressure hydrogenation reaction heat exchanger parallelly connected device, including one pipeline, one pipeline is connected with one valve, two valves, one gas exchanger, three valves, four valves in proper order, and one pipeline has two pipelines in parallel, two pipelines are connected with five valves, six valves, second heat exchanger, seven valves, eight valves in proper order on, the upper and lower end of one gas exchanger is connected with three pipelines, four pipelines respectively, the end of four pipelines is separately equipped with five pipelines and six pipelines, three pipelines are connected on five pipelines, ten valves, nine valves are connected in proper order on three pipelines, eleven valves, twelve valves are connected in proper order on four pipelines, one pressure transmitter is connected to five pipelines and six pipelines all and the communication connection between one pressure transmitter, has simple structure, the practicality is strong, can interlock and open the secondary line valve, keeps the process route unobstructed, avoids the reactor overtemperature etc. Technical features.

Description

Technical Field

[0001] This utility model relates to a device, and more specifically, to a novel parallel device for high-pressure hydrogenation reaction heat exchangers, belonging to the field of petrochemicals. Background Technology

[0002] High-pressure heat exchangers are crucial equipment in hydrogenation units. They utilize the high-temperature reaction products to heat the reactants, thereby saving energy required for heating the feedstock and indirectly improving economic efficiency. Simultaneously, they can reduce the load on the heater, decreasing unit construction costs. Lowering the temperature of the reaction products also helps reduce the load on the high-pressure air cooler, saving energy. Currently, the high-pressure heat exchanger process in hydrocracking units typically involves a single heat exchanger for one-pass operation. When two heat exchangers are connected in parallel, valves are installed before and after each heat exchanger. If these valves fail to close, the process flow will be disrupted, leading to accidents. Specifically: inability to switch back in time, resulting in unit shutdown; interruption of circulating hydrogen, preventing the heat generated from the reaction from being carried away during the material's residence time in the reactor, causing the reactor bed temperature to spike. Utility Model Content

[0003] To address the aforementioned technical problems, this utility model provides a novel parallel high-pressure hydrogenation reaction heat exchanger device with features such as simple structure, strong practicality, interlocking ability to open the secondary line valve, maintaining unobstructed process flow, and preventing reactor overheating.

[0004] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0005] A novel parallel device for high-pressure hydrogenation reaction heat exchangers includes a No. 1 pipeline, which is sequentially connected to a No. 1 valve, a No. 2 valve, a No. 1 gas exchanger, a No. 3 valve, and a No. 4 valve. A No. 2 pipeline is connected in parallel with the No. 1 pipeline, which is sequentially connected to a No. 5 valve, a No. 6 valve, a No. 2 heat exchanger, a No. 7 valve, and a No. 8 valve. The upper and lower ends of the No. 1 gas exchanger are respectively connected to the No. 3 pipeline and the No. 4 pipeline. The No. 4 pipeline has two branches, the No. 5 pipeline and the No. 6 pipeline. The No. 3 pipeline is connected to the No. 5 pipeline, and the No. 10 pipeline and the No. 9 pipeline are sequentially connected to the No. 3 pipeline. The No. 4 pipeline has two branches, the No. 11 pipeline and the No. 12 pipeline. Both the No. 5 and No. 6 pipelines are connected to a No. 1 pressure transmitter, and the No. 1 pressure transmitters are interconnected.

[0006] Preferably, the No. 1 pipeline is also connected in parallel with the No. 7 pipeline and the No. 8 pipeline. The No. 7 pipeline is connected to a regulating valve with a temperature controller. The No. 8 pipeline is connected to the No. 1 PDI high-high three-out-two-open valve. The No. 5 pipeline is connected to the No. 2 PDI high-high three-out-two-open valve. The No. 2 pressure transmitter is connected to the inlet end of the No. 1 pipeline and the outlet end of the No. 8 pipeline, and the No. 2 pressure transmitters are interconnected.

[0007] Preferably, the second PDI high-high three-out-two-open valve is connected to a pressure gauge, and the pressure gauge communicates with the second pressure transmitter.

[0008] Preferably, the upper and lower ends of the second heat exchanger are connected to pipeline No. 9 and pipeline No. 10, respectively. Pipeline No. 9 and pipeline No. 10 are connected to pipeline No. 1 and pipeline No. 4, respectively. Pipeline No. 9 is connected to valve No. 13 and valve No. 14 in sequence, and pipeline No. 15 and valve No. 16 in sequence are connected to pipeline No. 10.

[0009] Preferably, it also includes a nitrogen pipeline No. 1 and a nitrogen pipeline No. 2, wherein the two ends of the nitrogen pipeline No. 1 are respectively connected between valves No. 10 and No. 9 and between valves No. 3 and No. 4; and the two ends of the nitrogen pipeline No. 2 are respectively connected between valves No. 13 and No. 14 and between valves No. 7 and No. 8.

[0010] Preferably, it also includes a No. 1 low selector pipeline and a No. 2 low selector pipeline, the two ends of which are respectively connected to the space between valves No. 1 and No. 2 and between valves No. 11 and No. 12; the two ends of which are respectively connected to the space between valves No. 5 and No. 6 and between valves No. 15 and No. 16.

[0011] Preferably, valves No. 2, No. 3, No. 6, No. 7, No. 10, No. 11, No. 14, and No. 15 are respectively equipped with blind plates No. 1, No. 2, No. 3, No. 4, No. 5, No. 6, No. 7, and No. 8.

[0012] Beneficial effects: When the high-pressure heat exchanger malfunctions, the start-up time can be shortened and production resources saved by switching to a shutdown system; when the inlet and outlet valves of the high-pressure heat exchanger fail to close, the bypass valve can be interlocked to open, keeping the process route unobstructed and preventing the reactor from overheating. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] In the description of the utility model, it should be noted that the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the utility model.

[0016] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can also be an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0017] The purpose of this application is to: quickly switch to a backup heat exchanger when a high-pressure heat exchanger in a hydrogenation unit leaks or is damaged, maintaining normal unit operation and preventing unit shutdown due to heat exchanger failure; and to interlock and open the heat exchanger bypass valve when the inlet / outlet valves or the heat exchanger itself become blocked, ensuring unobstructed process flow and preventing reactor overheating accidents. It can be applied to all hydrogenation unit high-pressure heat exchanger system upgrades and capacity expansions that require parallel design of high-pressure heat exchangers.

[0018] Technical Solution / Principle of this Application: The two heat exchangers are designed in parallel, serving as backups for each other. Two bypass lines are installed on the cold flow side of each heat exchanger: one bypass line is equipped with a regulating valve for temperature control; the other bypass line is equipped with an interlocking shut-off valve. An interlocking shut-off valve is installed on the hot flow side of each heat exchanger. Both sets of interlocking shut-off valves use a differential pressure of 3:2 as the opening control signal. Additionally, each high-pressure heat exchanger has a condensate drain line at its inlet and a nitrogen purging line at its outlet for easy pre-maintenance handling. When the differential pressure of the heat exchanger exceeds the set value, the interlocking valve opens to allow material to pass through, keeping the process flow unobstructed.

[0019] like Figure 1The diagram illustrates a specific embodiment of a novel parallel high-pressure hydrogenation reaction heat exchanger device. This embodiment includes a No. 1 pipeline, which is sequentially connected to valves 1, 2, 1 heat exchanger E-1, 3, and 4. A No. 2 pipeline is connected in parallel with the No. 1 pipeline, and is sequentially connected to valves 5, 6, 2 heat exchangers E-2, 7, and 8. The upper and lower ends of the No. 1 gas exchanger E-1 are respectively connected to pipelines No. 3 and No. 4. Pipeline No. 4 has pipelines No. 5 and No. 6 branching off at its end. Pipeline No. 3 is connected to pipeline No. 5. Valve No. 10 and Valve No. 9 are sequentially connected to pipeline No. 3. Valve No. 11 and Valve No. 12 are sequentially connected to pipeline No. 4. Pipelines No. 5 and No. 6 are both connected to pressure transmitter No. 1, and these pressure transmitters are interconnected. The No. 1 gas exchanger E-1 and the No. 2 heat exchanger E-2 are high-pressure heat exchangers in the hydrogenation unit.

[0020] The procedure for switching heat exchanger tubes blocked is as follows: When an interlock occurs, the operator should slowly put the standby heat exchanger into operation, adjust it to the fully open position of the bypass regulating valve, close the interlock shut-off valve, and disconnect the original operating heat exchanger. The specific steps are as follows:

[0021] Initial state: Heat exchanger E-1 is in operation with the tube side blocked. The tube-side shut-off valves are fully open, the regulating valves are fully open, and the shell-side shut-off valves are fully closed. Valves 1, 2, 3, 4, 9, 10, 11, and 12 are fully open. Blind flanges 1.0, 2.0, 5.0, and 6.0 are in the open position. Heat exchanger E-2 is in standby. Valves 5, 6, 7, 8, 13, 14, 15, and 16 are fully closed. Blind flanges 3.0, 4.0, 7.0, and 8.0 are in the blind position.

[0022] Switching operation:

[0023] Step 1) Confirm that valves 5, 6, 7, 8, 13, 14, 15, and 16 are all closed, and blind flanges 3.0, 4.0, 7.0, and 8.0 are in the blind position. Heat exchanger E-2 is purged and is under nitrogen protection.

[0024] Step 2) Close valves 1, 4, 9 and 12 of heat exchanger E-1, open the shell and tube side of heat exchanger E-1 to the close-packed blind plate, and slightly open the close-packed valve.

[0025] Step 3) Set the blind flanges No. 3 (3.0), No. 4 (4.0), No. 7 (7.0), and No. 8 (8.0) at the inlet and outlet of the shell and tube side of heat exchanger E-2 to the open position, and confirm that the purging nitrogen and drain valves are fully closed and the blind flanges are in the blind position.

[0026] Step 4) Slightly open valves 5, 6, 7, 8, 13, 14, 15, and 16 of heat exchanger E-2 in sequence to preheat heat exchanger E-2.

[0027] Step 5) Slowly open all valves 5, 6, 7, 8, 13, 14, 15, and 16 of heat exchanger E-2, and close the cross-line electric valve.

[0028] Step 6) Check that the temperature of heat exchanger E-1 has dropped below 100℃, fully open the shell and tube side valve of heat exchanger E-1 to drain the oil, purge the blind plates of heat exchanger shell and tube side with nitrogen, and open the nitrogen valve to purge heat exchanger E-1.

[0029] Step 7) After purging is completed, close the airtight valve and the nitrogen purging valve, and guide the blind flanges. Close valves 2, 3, 10, and 11, and guide blind flanges 1.0, 2.0, 5.0, and 6.0. Heat exchanger E-1 is then ready for maintenance.

[0030] 1. System Composition

[0031] This application discloses a novel parallel device for high-pressure hydrogenation reaction heat exchangers, which mainly includes multiple valves (valve 1-valve 16), instruments (pressure transmitter PT, etc.), and heat exchangers (E-1, E-2), which are interconnected through pipelines to form a complete system.

[0032] 2. Connection relationship

[0033] Valve connection: Valves 1-16 are connected via pipes in a specific sequence (e.g., ...). Figure 1 As shown, these valves are used to control the flow and flow rate of fluid. Valve 1 and Valve 2 are sequentially installed on one branch of a pipeline; Valve 3 and Valve 4 are connected on another related branch; Valve 5 through Valve 8 are connected around heat exchanger E-2 to control the fluid path in and out of E-2; Valve 9 through Valve 12 are connected around heat exchanger E-1 to regulate the relevant fluid channels in heat exchanger E-1; and Valve 13 through Valve 16 play corresponding control roles on other auxiliary pipelines.

[0034] Instrument Connections: The pressure transmitter PT is installed at a specific pipeline location to monitor the pressure inside the pipeline. Its signal output is connected to the control system. The level switch LS is installed on the pipeline or equipment auxiliary container near heat exchangers E-1 and E-2 to detect the liquid level. The signal output of the level switch is also connected to the control system so as to control the operation of valves and other components according to the liquid level.

[0035] Heat exchanger connections: Heat exchangers E-1 and E-2 are connected to valves via pipes. The inlet pipe of heat exchanger E-1 is connected to valves 9 and 10, etc., and the outlet pipe is connected to valves 11 and 12, etc.; the inlet pipe of E-2 is connected to valves 5 and 6, etc., and the outlet pipe is connected to valves 7 and 8, etc., to realize the specific process of fluid in the equipment, such as heat exchange, reaction, etc.

[0036] Overall piping connection: Valves, instruments and heat exchangers are interconnected through pipelines to form a closed-loop or open-loop fluid control system. Fluid enters from the system inlet, is regulated by valves, processed by heat exchangers (such as E-1, E-2), and monitored by instruments, and finally flows out from the system outlet. Throughout the process, parameters such as fluid flow rate, pressure and liquid level are controlled and regulated.

[0037] In a preferred embodiment, pipeline number one is further connected in parallel to pipelines number seven and eight. Pipeline number seven is connected to a regulating valve with a temperature controller. Pipeline number eight is connected to a PDI high-high three-out-two-way valve 1.1. Pipeline number five is connected to a PDI high-high three-out-two-way valve 1.2. Pressure transmitters number two are connected to the inlet end of pipeline number one and the outlet end of pipeline number eight, and these two pressure transmitters are communicatively connected. Pressure gauges are connected to the PDI high-high three-out-two-way valve 1.2, and these pressure gauges communicate with the pressure transmitters. Pipelines number nine and ten are connected to the upper and lower ends of heat exchanger number two, respectively. Pipelines nine and ten are connected to pipelines number one and four, respectively. Valve number 13 and valve number 14 are sequentially connected to pipeline number nine, and valve number 15 and valve number 16 are sequentially connected to pipeline number ten. It also includes nitrogen pipeline No. 1 and nitrogen pipeline No. 2. Nitrogen pipeline No. 1 is connected at both ends to valves 10 and 9, and valves 3 and 4, respectively. Nitrogen pipeline No. 2 is connected at both ends to valves 13 and 14, and valves 7 and 8, respectively. It also includes low-temperature selector pipeline No. 1 and low-temperature selector pipeline No. 2. Low-temperature selector pipeline No. 1 is connected at both ends to valves 1 and 2, and valves 11 and 12, respectively. Low-temperature selector pipeline No. 2 is connected at both ends to valves 5 and 6, and valves 15 and 16, respectively. The valves 2, 3, 6, 7, 10, 11, 14, and 15 are respectively equipped with blind plates 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, and 8.0.

[0038] In practical applications, the initial opening degree of each valve and the control parameters of the instruments are first preset by the control system according to specific operating conditions, such as production tasks and process parameter requirements. Fluid flows in from the system inlet pipe, and the pressure transmitter PT monitors the pressure in the pipe in real time and feeds the signal back to the control system (such as a DCS control system used in industry). When the pressure exceeds the set range, the control system automatically adjusts the opening degree of relevant valves (such as regulating valves 1-4) to stabilize the pressure. The level switch LS monitors the liquid level in real time. When the liquid level reaches the set threshold, the control system controls the corresponding valves (such as valves 11 and 12, etc., which are related to the liquid level) to maintain a stable liquid level. Equipment E-1 and E-2 perform specific processing on the fluid according to process requirements, such as absorbing or releasing heat during heat exchange. The fluid entering and leaving the equipment is controlled by valves, thereby achieving stable operation of the entire system and the process objectives.

[0039] Finally, it should be noted that this utility model is not limited to the above embodiments, and many variations are possible. All variations that can be directly derived or conceived by those skilled in the art from the disclosure of this utility model should be considered within the protection scope of this utility model.

Claims

1. A novel parallel device for high-pressure hydrogenation reaction heat exchangers, characterized in that: The system includes a No. 1 pipeline, which is sequentially connected to a No. 1 valve (1), a No. 2 valve (2), a No. 1 heat exchanger (E-1), a No. 3 valve (3), and a No. 4 valve (4). A No. 2 pipeline is connected in parallel with the No. 1 pipeline. A No. 5 valve (5), a No. 6 valve (6), a No. 2 heat exchanger (E-2), a No. 7 valve (7), and a No. 8 valve (8) are sequentially connected to the No. 1 heat exchanger (E-1). The No. 3 pipeline and the No. 4 pipeline are respectively connected to the upper and lower ends of the No. 1 heat exchanger (E-1). The No. 4 pipeline is divided into a No. 5 pipeline and a No. 6 pipeline. The No. 3 pipeline is connected to the No. 5 pipeline. A No. 10 valve (10) and a No. 9 valve (9) are sequentially connected to the No. 3 pipeline. A No. 11 valve (11) and a No. 12 valve (12) are sequentially connected to the No. 4 pipeline. Both the No. 5 pipeline and the No. 6 pipeline are connected to a No. 1 pressure transmitter, and the No. 1 pressure transmitters are interconnected.

2. The novel parallel device for high-pressure hydrogenation reaction heat exchangers according to claim 1, characterized in that: Pipeline No. 1 is also connected in parallel to Pipelines No. 7 and No.

8. Pipeline No. 7 is connected to a regulating valve with a temperature controller. Pipeline No. 8 is connected to a PDI high-high three-out-two-open valve (1.1). Pipeline No. 5 is connected to a PDI high-high three-out-two-open valve (1.2). Pressure transmitters No. 2 are connected to the inlet end of Pipeline No. 1 and the outlet end of Pipeline No. 8, and the pressure transmitters No. 2 are interconnected.

3. A novel parallel high-pressure hydrogenation reaction heat exchanger device according to claim 2, characterized in that: The second PDI high-high three-out-two opening valve (1.2) is connected to a pressure gauge, and the pressure gauge communicates with the second pressure transmitter.

4. A novel parallel high-pressure hydrogenation reaction heat exchanger device according to claim 1, 2, or 3, characterized in that: The upper and lower ends of the second heat exchanger (E-2) are respectively connected to pipeline No. 9 and pipeline No.

10. Pipeline No. 9 and pipeline No. 10 are respectively connected to pipeline No. 1 and pipeline No.

4. Pipeline No. 9 is connected to valve No. 13 (13) and valve No. 14 (14) in sequence, and pipeline No. 10 is connected to valve No. 15 (15) and valve No. 16 (16) in sequence.

5. A novel parallel high-pressure hydrogenation reaction heat exchanger device according to claim 4, characterized in that: It also includes nitrogen pipeline No. 1 and nitrogen pipeline No.

2. Nitrogen pipeline No. 1 is connected at both ends between valve No. 10 (10) and valve No. 9 (9) and valve No. 3 (3) and valve No. 4 (4), respectively. Nitrogen pipeline No. 2 is connected at both ends between valve No. 13 (13) and valve No. 14 (14) and valve No. 7 (7) and valve No. 8 (8), respectively.

6. A novel parallel high-pressure hydrogenation reaction heat exchanger device according to claim 5, characterized in that: It also includes a No. 1 low selector pipeline and a No. 2 low selector pipeline. The two ends of the No. 1 low selector pipeline are respectively connected between the No. 1 valve (1) and the No. 2 valve (2) and between the No. 11 valve (11) and the No. 12 valve (12); the two ends of the No. 2 low selector pipeline are respectively connected between the No. 5 valve (5) and the No. 6 valve (6) and between the No. 15 valve (15) and the No. 16 valve (16).

7. A novel parallel high-pressure hydrogenation reaction heat exchanger device according to claim 6, characterized in that: The valves No. 2 (2), No. 3 (3), No. 6 (6), No. 7 (7), No. 10 (10), No. 11 (11), No. 14 (14), and No. 15 (15) are respectively equipped with blind plates No. 1 (1.0), No. 2 (2.0), No. 3 (3.0), No. 4 (4.0), No. 5 (5.0), No. 6 (6.0), No. 7 (7.0), and No. 8 (8.0).

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