Discharging device of esterification buffer tank
By designing the discharge device of the esterified buffer tank, using technical means such as differential pressure gauge and backblowing pipe, the equipment blockage caused by foreign matter in the buffer tank is solved, and the continuous discharge of materials and safe maintenance of equipment is achieved, which reduces the Production risks and maintenance costs.
Patent Information
- Application Number
- CN202420123776.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-17
- Publication Date
- 2024-12-06
- Estimated Expiration
- 2034-01-17
AI Technical Summary
In the process of synthesis of dimethyl adipic acid and methanol into dimethyl adipic acid, chemical enterprises failed to react sufficiently, resulting in residual adipic acid crystals and foreign matters in the buffer tank, causing blockage of downstream equipment, affecting production progress and existence Security risks.
A feed discharge device for an esterification buffer tank is designed, including a first pipeline, a second pipeline, a differential pressure gauge, a valve and a filter. The pressure difference of the pipeline is detected by a differential pressure gauge, and the pipeline state is automatically switched. , ensure that the material is discharged uninterrupted, and use the backflushing pipe and shower guide valve to reverse the filter to avoid blockage and waste of materials.
It effectively avoids blockage in downstream processes, ensures continuous discharge of materials, reduces maintenance costs, improves production safety, and avoids waste of materials.
Smart Images
Figure CN222111741U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of chemical industry, in particular to a discharging device of an esterification buffer tank. Background Art
[0002] In the process of synthesizing dimethyl adipate using adipic acid and methanol as raw materials, chemical companies first put adipic acid and methanol into a buffer tank for pre-esterification, and then discharge them to a flash tower to separate the unreacted methanol.
[0003] Since adipic acid and methanol cannot fully react, adipic acid crystals remain, and there is also the risk of foreign matter in the raw materials. When the buffer tank is discharged to the downstream process, the foreign matter will cause the flow meter, regulating valve and other equipment to be blocked, resulting in low flow or even no flow. When the flow cannot meet production needs, the buffer tank discharge can only be stopped, and the foreign matter can be cleared by backflushing through a temporary pipeline connected to a shower valve, which seriously affects the production progress and there are many unsafe factors.
[0004] Therefore, how to effectively prevent the impurity solids from being discharged from the esterification buffer tank is an urgent problem to be solved by those skilled in the art. Summary of the invention
[0005] The utility model aims to provide a discharging device for an esterification buffer tank in view of the deficiencies in the prior art, which has a simple structure and low maintenance cost and can effectively avoid blockage in downstream processes.
[0006] The technical scheme of the utility model is: a discharging device of an esterification buffer tank, comprising a first pipeline, a second pipeline, and a differential pressure gauge, wherein the upstream ends of the first pipeline and the second pipeline are connected in parallel and are used to be connected to the discharging end of the esterification buffer tank, the downstream ends of the first pipeline and the second pipeline are connected in parallel and are used to be connected to the feeding end of a flash tank through a third valve, the first pipeline and the second pipeline are sequentially provided with a first valve, a filter, and a second valve from upstream to downstream, the number of the differential pressure gauges is two, corresponding to the first pipeline and the second pipeline respectively, the first detection end of the differential pressure gauge is connected to the pipeline and is located between the filter and the first valve, the second detection end is connected to the pipeline and is located between the filter and the second valve, and the first pipeline and the second pipeline are also provided with a shower valve located between the first valve and the filter.
[0007] The filter is a tubular filter and is installed on the first pipeline and the second pipeline through flange connection.
[0008] The first pipeline and the second pipeline are both provided with a backflush pipe, which is located between the filter and the second valve, and a fourth valve is provided on the backflush pipe.
[0009] There are two backflush pipes, wherein the upstream end of one backflush pipe is used to be connected to a pressure water source, and the upstream end of the other backflush pipe is used to be connected to a pressure air source.
[0010] The above technical solution has the following beneficial effects:
[0011] 1. The discharge device of the esterification buffer tank includes a first pipeline, a second pipeline, and a differential pressure gauge. The upstream ends of the first pipeline and the second pipeline are connected in parallel, and are used to be connected to the discharge end of the esterification buffer tank. The downstream ends of the first pipeline and the second pipeline are connected in parallel, and are used to be connected to the feed end of the flash tank through the third valve, that is, the material discharged from the esterification buffer tank can enter the flash tank through the first pipeline and the second pipeline. The first valve, the filter, and the second valve are arranged on the first pipeline and the second pipeline from upstream to downstream in sequence. By opening or closing the first valve and the second valve on the corresponding pipeline, the first pipeline or the second pipeline is in an open or closed state, so that the first pipeline and the second pipeline are backed up for each other. There are two pressure differential gauges, corresponding to the first pipeline and the second pipeline respectively. The first detection end of the pressure differential gauge is connected to the pipeline and is located between the filter and the first valve. The second detection end is connected to the pipeline and is located between the filter and the second valve. The pressure differential gauge detects the pressure difference on both sides of the corresponding pipeline filter. When the pressure difference exceeds the specified value, it means that the filter on the pipeline needs maintenance. The first valve and the second valve on the other pipeline are opened, and the first valve and the second valve on the pipeline are closed to ensure that the material is discharged uninterruptedly to the downstream flash tower. The first pipeline and the second pipeline are also provided with a shower valve, which is located between the first valve and the filter. When the filter on the pipeline to be maintained needs to be regenerated, the first valve and the second valve on the other pipeline are kept open, the opening of the third valve is adjusted, and the second valve on the pipeline to be maintained is opened, so that part of the pre-esterified crude product flows back from the other pipeline into the pipeline to be maintained, reversely flushes the filter on the pipeline to be maintained, completes the maintenance work of the filter on the pipeline to be maintained, and closes the second valve. This is alternated, on the basis of ensuring uninterrupted discharge, avoiding the doping of the material discharged to the downstream process.
[0012] 2. The filter is a tubular filter, which is installed on the first pipeline and the second pipeline through flange connection, which is convenient for installation and disassembly of the filter and also conducive to maintenance of the filter.
[0013] 3. Backflush pipes are provided on both the first pipeline and the second pipeline, and are located between the filter and the second valve. A fourth valve is provided on the backflush pipe. When part of the crude pre-esterification product is used to complete the maintenance of the filter to be maintained, the fourth valve on the backflush pipe on the corresponding pipeline can be opened to fill in a pressurized flushing medium to completely discharge the remaining crude pre-esterification product, thereby ensuring production safety and avoiding material waste. Alternatively, the flushing medium with pressurization can be directly used to reversely flush the filter on the pipeline to be maintained to complete the maintenance of the filter on the pipeline with maintenance, thereby eliminating the need to reduce the flow rate of the discharged crude pre-esterification product.
[0014] 4. There are two backflush pipes, the upstream end of one backflush pipe is used to connect to a pressure water source, and the upstream end of the other backflush pipe is used to connect to a pressure gas source. When the filter is maintained directly using a pressurized flushing medium, the pressurized gas is first used to discharge the residual pre-esterified crude product in the pipe section between the first valve and the second valve in the pipeline to be maintained, which is convenient for recovery, and then the pressurized water is used to reversely flush the filter to complete the maintenance. Finally, the pressurized gas is used to drain the remaining water to ensure the maintenance effect.
[0015] Further description is given below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a connection diagram of the utility model.
[0017] In the attached drawings, 1 is the first pipeline, 2 is the second pipeline, 3 is the differential pressure gauge, 4 is the filter, 5 is the shower valve, 6 is the backflush pipe, a is the first valve, b is the second valve, c is the third valve, and d is the fourth valve. DETAILED DESCRIPTION
[0018] See also Figure 1 , is a specific embodiment of a discharge device of an esterification buffer tank. The discharge device of the esterification buffer tank includes a first pipeline 1, a second pipeline 2, and a differential pressure gauge 3. Specifically, the first pipeline and the second pipeline have the same size and are arranged to extend in the horizontal direction. The upstream ends of the first pipeline 1 and the second pipeline 2 are connected in parallel, and are used to be connected to the discharge end of the esterification buffer tank. The downstream ends of the first pipeline 1 and the second pipeline 2 are connected in parallel, and are used to be connected to the feed end of the flash tank through a third valve c. The first valve a, the filter 4, and the second valve b are arranged on the first pipeline 1 and the second pipeline 2 from upstream to downstream, wherein the filter 4 is a tubular filter, which is installed on the first pipeline 1 and the second pipeline 2 through a flange connection. The number of the differential pressure gauges 3 is two, corresponding to the first pipeline 1 and the second pipeline 2 respectively. The first detection end of the differential pressure gauge is connected to the pipeline and is located between the filter 4 and the first valve a, and the second detection end is connected to the pipeline and is located between the filter 4 and the second valve b. The first pipeline 1 and the second pipeline 2 are both provided with a shower valve 5, which is located between the first valve a and the filter 4. Usually, the downstream end of the shower valve is connected to a recovery device, and can also be connected to a sewage station, or sent to a flare tower for incineration. The first pipeline 1 and the second pipeline 2 are also provided with a backflush pipe 6, which is located between the filter 4 and the second valve b. A fourth valve d is provided on the backflush pipe 6. In this embodiment, there are two backflush pipes 6, the upstream end of one backflush pipe is used to be connected to a pressure water source, and the upstream end of the other backflush pipe is used to be connected to a pressure gas source.
[0019] The working principle of the utility model is as follows: after the pre-esterification in the buffer tank is completed, the first valve and the second valve on the first pipeline are opened, and the first valve and the second valve on the second pipeline are closed, and the third valve is opened, so that the first pipeline is in an open state and the second pipeline is in a closed state, so that the first pipeline and the second pipeline serve as backup for each other. The pressure difference on both sides of the filter of the first pipeline is detected by a differential pressure gauge. When the pressure difference exceeds the specified value, it means that the filter on the first pipeline needs maintenance. The first valve and the second valve on the second pipeline are opened, and the first valve and the second valve on the first pipeline are closed to ensure that the material is discharged uninterruptedly to the downstream flash tower. The opening of the third valve is adjusted (reduced), and the second valve on the first pipeline is opened, so that part of the crude pre-esterification product flows back into the first pipeline from the second pipeline, and the filter on the first pipeline is reversely flushed. After the maintenance of the filter on the first pipeline is completed, the second valve on the first pipeline is closed. After the maintenance is completed, the fourth valve on the backflush pipe on the first pipeline can be opened to fill in pressurized gas to completely discharge the residual crude pre-esterification product. Alternatively, open the first valve and the second valve on the second pipeline, and close the first valve and the second valve on the first pipeline, keep the opening of the third valve, first use pressurized gas to discharge the residual pre-esterified crude product in the pipe section between the first valve and the second valve in the first pipeline to facilitate recovery, then use pressurized water to reversely flush the filter to complete the maintenance, and finally use pressurized gas to drain the remaining water to ensure the maintenance effect.
Claims
1. A discharging device for an esterification buffer tank, characterized in that: It comprises a first pipeline (1), a second pipeline (2), and a differential pressure gauge (3). The upstream ends of the first pipeline (1) and the second pipeline (2) are connected in parallel and are used to be connected to the discharge end of the esterification buffer tank. The downstream ends of the first pipeline (1) and the second pipeline (2) are connected in parallel and are used to be connected to the feed end of the flash tank through the third valve (c). The first pipeline (1) and the second pipeline (2) are provided with a first valve (a), a filter (4), and a second valve (b) in sequence from upstream to downstream. The number of the differential pressure gauges (3) is two, corresponding to the first pipeline (1) and the second pipeline (2), respectively; the first detection end of the differential pressure gauge is connected to the pipeline and is located between the filter (4) and the first valve (a); the second detection end of the differential pressure gauge is connected to the pipeline and is located between the filter (4) and the second valve (b); The first pipeline (1) and the second pipeline (2) are both provided with a shower valve (5), which is located between the first valve (a) and the filter (4).
2. The discharging device of the esterification buffer tank according to claim 1 is characterized in that: The filter (4) is a tubular filter and is installed on the first pipeline (1) and the second pipeline (2) through flange connection.
3. The discharging device of the esterification buffer tank according to claim 1 is characterized in that: The first pipeline (1) and the second pipeline (2) are both provided with a backflush pipe (6), which is located between the filter (4) and the second valve (b), and a fourth valve (d) is provided on the backflush pipe (6).
4. The discharging device of the esterification buffer tank according to claim 3 is characterized in that: The number of the backflush pipes (6) is two, wherein the upstream end of one backflush pipe is used to be connected to a pressure water source, and the upstream end of the other backflush pipe is used to be connected to a pressure air source.