A device capable of simultaneously carrying out multiple batches of vacuum drying and a vacuum drying method thereof

Abstract

The present invention belongs to the field of isotope separation, and specifically relates to a device capable of simultaneously carrying out multiple batches of vacuum drying and a vacuum drying method thereof, comprising: a starting evacuation device, a spare evacuation device A, a spare evacuation device B, a starting evacuation main pipe, a spare evacuation main pipe, a lean material side evacuation device, a fine material side evacuation device 7 and a plurality of connecting pipelines; the present invention can effectively shorten the original startup cycle, reduce the operating time of each startup operating condition, thereby reducing the output of intermediate abundance products and the processing time of such products, start the production of target products faster, and effectively improve the cascade efficiency.

Description

Technical Field

[0001] The invention belongs to the field of isotope separation, and in particular relates to a device capable of simultaneously carrying out multiple batches of vacuum drying and a vacuum drying method thereof. Background Art

[0002] In order to ensure the normal operation of the main engine after startup, the main engine needs to be vacuum dried before startup to separate volatile substances such as water and oil in the main engine. The existing startup mode starts from the cascade fine feed end unit and vacuum dries the main engine in batches. The plant structure and processing flow diagram are shown in Figure 1 .

[0003] Since the number of main machines for single batch vacuum drying is limited by the capacity of the vacuum equipment, the heating capacity of preheated water and the structure of the section, the vacuum system flow diagram is shown in Figure 2 .

[0004] A single batch can process no more than 18 main engines, about 6 to 7 sections, and needs to thaw the cold traps daily to count the discharge volume. A single batch requires at least two vacuum systems to switch with each other. For rigid cascades, the number of sections contained in each unit in the cascade is different, and the impact and startup processes are carried out on a unit basis, which will cause the vacuum drying process and the startup process time to run out in units with a large number of sections, forcing the continuous startup process to be terminated. The following problems exist:

[0005] Disadvantage 1: Delaying the progress of project commissioning and causing direct economic losses;

[0006] Disadvantage 2: The production line is in startup condition for a longer time, producing a larger amount of intermediate abundance products, which will cause a certain amount of separation work loss in the subsequent formal operation to process the products. Summary of the invention

[0007] In view of the shortcomings of the prior art, the present invention proposes a method for simultaneously carrying out vacuum drying of multiple batches by centrifugal cascade, which divides the system from the unit with a large number of machines in the central plant into two parts, and carries out vacuum drying work simultaneously, thus avoiding process conflicts in large units.

[0008] The technical solution of the present invention:

[0009] A device capable of simultaneously carrying out multiple batches of vacuum drying comprises: a starting evacuation device, a standby evacuation device A, a standby evacuation device B, a starting evacuation main pipe, a standby evacuation main pipe, a lean material side evacuation device, a fine material side evacuation device and a plurality of connecting pipelines; the starting evacuation device and the standby evacuation device A are respectively connected to the starting evacuation main pipe through connecting pipelines, the standby evacuation device B is connected to the standby evacuation main pipe through connecting pipelines; the starting evacuation main pipe is also connected to a fine material side evacuation device; the standby evacuation main pipe is connected to a lean material side evacuation device.

[0010] A vacuum drying method of a device capable of simultaneously carrying out multiple batches of vacuum drying comprises the following steps:

[0011] Step 1: Take time to arrange the route;

[0012] Step 2: Renovation of preheating water system;

[0013] Step 3, vacuum drying batch arrangement;

[0014] Step 4: vacuum drying process control.

[0015] The step 1 of evacuating the route arrangement includes the following steps:

[0016] Step 1.1 Pump down the line without unit startup batch conditions

[0017] In order to carry out vacuum drying work at the same time, the two spare vacuum devices A2 and B3 meet the requirements of working independently in the same time period, and each has a system for daily switching;

[0018] Step 1.2 Pump down the line under unit startup conditions

[0019] For the unit that has finished vacuum drying, start from the fine material end. To ensure that the startup unit can be evacuated, on the basis of step 1.1, ensure that the independent pipeline and evacuation device can evacuate the startup unit.

[0020] : The step 2 preheating water system transformation includes adding a set of preheating water heating boilers and supporting pipelines to the original preheating water system.

[0021] The vacuum drying batch arrangement in step 3 is divided into two vacuum drying batches A and B with the starting vacuuming device, the standby vacuuming device A and the standby vacuuming device B as the boundary. The two groups A and B independently carry out vacuum drying at the same time, and advance batch by batch to their respective lean material sides.

[0022] The vacuum drying process in step 4 is controlled by using the cold trap discharge volume as the qualified standard for vacuum drying. Under normal conditions, the vacuum device is replaced every day and the cold trap is thawed, and the discharge volume is calculated.

[0023] The vacuum drying batch arrangement of step 3 comprises the following steps:

[0024] Step 3.1 Route arrangement without startup process

[0025] The vacuum drying of group A uses the spare evacuation device B and the fine material side evacuation device 7 to start the evacuation main pipe 4 and the right side of the spare evacuation main pipe 5 to evacuate. The spare evacuation device A and the fine material side evacuation device 7 are switched with each other, and the drainage is measured and recorded;

[0026] The vacuum drying of group B uses the starting evacuation device and the lean material side evacuation device to evacuate through the starting evacuation main pipe and the right side of the standby evacuation main pipe respectively. The starting evacuation device and the lean material side evacuation device are interchanged with the evacuation device, and the drainage is measured and recorded.

[0027] Step 3.2 has a line arrangement for the startup process, including: starting one by one from unit 13 on the fine material side to unit 1 on the lean material side.

[0028] Beneficial effects of the present invention:

[0029] (1) Effectively reduce the vacuum drying time, so that the vacuum drying process and the main engine impact start process time can be better matched during the startup process, effectively reducing unnecessary time waste.

[0030] (2) Better guarantee of project construction time node requirements.

[0031] (3) Compared with the existing technology, it can effectively shorten the original startup cycle and reduce the operating time of each startup condition, thereby reducing the output of intermediate abundance products and the processing time of such products, starting the production of target products faster, and effectively improving the cascade efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic diagram of a device designed for the present invention that can carry out multiple batches of vacuum drying at the same time;

[0033] Figure 2 A schematic diagram of a vacuum drying method flow chart of a device designed for the present invention that can simultaneously carry out multiple batches of vacuum drying;

[0034] In the figure: 1: start the vacuum device, 2: spare vacuum device A, 3: spare vacuum device B, 4: start the vacuum main pipe, 5: spare vacuum main pipe, 6: vacuum device on the lean material side, 7: vacuum device on the fine material side. DETAILED DESCRIPTION

[0035] The method for simultaneously carrying out multiple batches of vacuum drying by centrifugal cascade of the present invention is described in detail below in conjunction with the accompanying drawings and embodiments.

[0036] A device capable of simultaneously carrying out multiple batches of vacuum drying comprises: a starting evacuation device 1, a standby evacuation device A2, a standby evacuation device B3, a starting evacuation main pipe 4, a standby evacuation main pipe 5, a lean material side evacuation device 6, a fine material side evacuation device 7 and a plurality of connecting pipelines; the starting evacuation device 1 and the standby evacuation device A2 are respectively connected to the starting evacuation main pipe 4 through connecting pipelines, the standby evacuation device B3 is connected to the standby evacuation main pipe 5 through connecting pipelines; the starting evacuation main pipe 4 is also connected to the fine material side evacuation device 7; the standby evacuation main pipe 5 is connected to the lean material side evacuation device 6.

[0037] A vacuum drying method of a device capable of simultaneously carrying out multiple batches of vacuum drying comprises the following steps:

[0038] Step 1: Take time to arrange the route;

[0039] Step 2: Renovation of preheating water system;

[0040] Step 3, vacuum drying batch arrangement;

[0041] Step 4: vacuum drying process control.

[0042] The step 1 of evacuating the route arrangement includes the following steps:

[0043] Step 1.1 Pump down the line without unit startup batch conditions

[0044] In order to carry out vacuum drying work at the same time, the two spare vacuum devices A2 and B3 meet the requirements of working independently in the same time period, and each has a system for daily switching;

[0045] Step 1.2 Pump down the line under unit startup conditions

[0046] For the unit that has finished vacuum drying, start from the fine material end. To ensure that the startup unit can be evacuated, on the basis of step 1.1, ensure that the independent pipeline and evacuation device can evacuate the startup unit.

[0047] : The step 2 preheating water system transformation includes adding a set of preheating water heating boilers and supporting pipelines to the original preheating water system.

[0048] The vacuum drying batch arrangement in step 3 is divided into two vacuum drying batches A and B with the starting vacuuming device 1, the standby vacuuming device A2 and the standby vacuuming device B3 in the middle of the plant as the boundary. The two groups A and B independently carry out vacuum drying at the same time and advance batch by batch to their respective lean material sides.

[0049] The vacuum drying process in step 4 is controlled by using the cold trap discharge volume as the qualified standard for vacuum drying. Under normal conditions, the vacuum device is replaced every day and the cold trap is thawed, and the discharge volume is calculated.

[0050] The vacuum drying batch arrangement of step 3 comprises the following steps:

[0051] Step 3.1 Route arrangement without startup process

[0052] The vacuum drying of group A uses the spare evacuation device B3 and the fine material side evacuation device 7 to start the evacuation main pipe 4 and the right side of the spare evacuation main pipe 5 to evacuate. The spare evacuation device A2 and the fine material side evacuation device 7 are switched with each other, and the drainage is measured and recorded;

[0053] The vacuum drying of group B uses the starting evacuation device 1 and the lean material side evacuation device 6 respectively. The evacuation devices are evacuated through the starting evacuation main pipe 4 and the right side of the spare evacuation main pipe 5. The starting evacuation device 1 and the lean material side evacuation device 6 sets of evacuation devices are switched with each other, and the drainage is measured and recorded.

[0054] Step 3.2 has a line arrangement for the startup process, including: starting one by one from unit 13 on the fine material side to unit 1 on the lean material side.

[0055] Example

[0056] Take the rigid cascade of 13 units with 200 main engines as an example:

[0057] Step 1: Pumping system transformation

[0058] After the vacuum system is started up, it has basically no actual function. The old cascade vacuum system equipment can be used to transform the vacuum system of the new project:

[0059] Considering the plant space, the new pump groups can be installed at both ends of the plant, namely on both sides of the fine material flow and the lean material flow.

[0060] Step 2 Vacuum drying batch arrangement

[0061] Schematic diagram of the post-processing flow of the system change.

[0062] The middle part of the plant, i.e., units 6 and 7, is divided into two parts. Vacuum drying is carried out from units 13 and 6 towards their respective lean material ends. The batch arrangement is shown in Table 1.

[0063] Table 1 Vacuum drying batch arrangement

[0064]

[0065] Step 3: Time out for line arrangement

[0066] Step 3.1 Route arrangement without startup process

[0067] The vacuum drying of group A uses the preparatory evacuation device B3, the newly added evacuation device 7 on the fine material side, and the evacuation device passes through the evacuation main pipe 4 and the preparatory evacuation main pipe 5, the spare evacuation device A2, and the newly added evacuation device 7 on the fine material side, and the drainage is measured and recorded;

[0068] The vacuum drying of group B uses the starting evacuation device and the newly added lean material side evacuation device to evacuate through the starting evacuation main pipe and the right side of the reserve evacuation main pipe respectively. The starting evacuation device and the newly added lean material side evacuation device are interchanged within the evacuation device, and the drainage is measured and recorded.

[0069] Step 4 Vacuum drying hot water line

[0070] The main preheating water pipe of the hall is cut off from the middle, and a temporary boiler is added on the side of unit 1 to provide hot water for units 1-6. The original system provides hot water for units 7-13.

[0071] The embodiments of the present invention are described in detail above, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the field without departing from the purpose of the present invention.

Claims

1. A vacuum drying method for a device capable of simultaneously carrying out multiple batches of vacuum drying, characterized in that: A device capable of simultaneously carrying out multiple batches of vacuum drying comprises: a starting evacuation device (1), a standby evacuation device A (2), a standby evacuation device B (3), a starting evacuation main pipe (4), a standby evacuation main pipe (5), a lean material side evacuation device (6), a fine material side evacuation device (7), and a plurality of connecting pipelines; the starting evacuation device (1) and the standby evacuation device A (2) are respectively connected to the starting evacuation main pipe (4) through connecting pipelines, and the standby evacuation device B (3) is connected to the standby evacuation main pipe (5) through connecting pipelines; the starting evacuation main pipe (4) is also connected to the fine material side evacuation device (7); and the standby evacuation main pipe (5) is connected to the lean material side evacuation device (6); The vacuum drying method of the device capable of simultaneously carrying out multiple batches of vacuum drying comprises the following steps: Step 1: Take time to arrange the route; Step 2: Renovation of preheating water system; Step 3, vacuum drying batch arrangement; Step 4: vacuum drying process control; The step 1 of arranging the route includes the following steps: Step 1.1 Pump down the line without unit startup batch conditions In order to carry out vacuum drying work at the same time, the two spare vacuum devices A (2) and spare vacuum device B (3) meet the requirements of working independently of each other in the same time period, and each has a system for daily switching; Step 1.2 Pump down the circuit under unit startup conditions Start the unit that has finished vacuum drying from the fine material end. To ensure that the unit is evacuated, ensure that the independent pipeline and evacuation device evacuate the unit based on step 1.

1. The step 2 preheating water system modification includes adding a set of preheating water heating boilers and supporting pipelines to the original preheating water system; The vacuum drying batch arrangement in step 3 is divided into two vacuum drying batches, A and B, with the starting vacuum drying device (1), the standby vacuum drying device A (2), and the standby vacuum drying device B (3) as the boundary. The two groups A and B independently carry out vacuum drying at the same time, and advance batch by batch towards their respective lean material sides; The vacuum drying process in step 4 is controlled by using the cold trap discharge volume as the qualified standard for vacuum drying. Under normal conditions, the vacuum device is switched every day and the cold trap is thawed, and the discharge volume is calculated; The vacuum drying batch arrangement of step 3 comprises the following steps: Step 3.1 Route arrangement without startup process The vacuum drying of group A uses the spare evacuation device B (3) and the fine material side evacuation device (7) to start the evacuation main pipe (4) and the right side of the spare evacuation main pipe (5) to evacuate, and the spare evacuation device A (2) and the fine material side evacuation device (7) are switched between the evacuation devices, and the drainage is measured and recorded; The vacuum drying of group B uses the starting evacuation device (1) and the lean material side evacuation device (6) to evacuate the right side of the starting evacuation main pipe (4) and the standby evacuation main pipe (5), and the starting evacuation device (1) and the lean material side evacuation device (6) are switched with each other, and the drainage is measured and recorded; Step 3.2 has a line arrangement of the startup process, including: starting one by one from unit 13 on the fine material side to unit 1 on the lean material side.

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