Filtering system of liquid-phase dryer

Abstract

The utility model relates to the technical field of petrochemical engineering, and discloses a liquid phase dryer filtering system which comprises a filtering feeding pipe, a filtering branch pipe, a filter and a filtering discharging pipe, one end of the filtering feeding pipe is used for being communicated with an output port of a dryer, and the other end of the filtering feeding pipe is communicated with one end of the filtering branch pipe. One end of the filter branch pipe is communicated with the inlet of the dethanizer, the other end of the filter branch pipe is communicated with one end of the filter discharge pipe, the other end of the filter discharge pipe is used for being communicated with the inlet of the dethanizer, the number of the filter branch pipes is at least two, the at least two filter branch pipes are arranged in parallel, and the at least two filters are arranged on the at least two filter branch pipes in a one-to-one correspondence manner. According to the application, the filter is arranged between the dryer and the dethanizing column, so that powder or molecular sieve particles generated when the molecular sieve particles in the dryer are abraded are filtered, and the molecular sieve powder or particles are prevented from entering the dethanizing column and causing blockage of devices on downstream equipment pipelines.

Description

Technical Field

[0001] The utility model relates to the technical field of petrochemical industry, in particular to a liquid phase dryer filtering system. Background Art

[0002] At present, the feed dryer of the deethanizer of the propane dehydrogenation unit is used to dry the liquid hydrocarbons at the bottom of the buffer tank (which serves as the feed of the deethanizer). The dryer is equipped with a 1 / 16-inch spherical 3A molecular sieve, which can remove trace water from the liquid hydrocarbons. After the trace water is removed, the feed of the deethanizer enters the deethanizer to remove light components such as C2.

[0003] However, due to the relative movement of the 3A molecular sieve bed during the process of increasing and decreasing pressure, the molecular sieve particles will be worn out to produce powder or become smaller over time, and the powder or smaller particles are at risk of leaking along the wire mesh at the top of the dryer. If the 3A molecular sieve leaks, the 3A molecular sieve will enter the deethanizer through the regulating valve along the pipeline, which may easily cause the flow meter and other pressure-inducing pipes of the downstream equipment pipeline to be blocked or the control valve to be stuck. Utility Model Content

[0004] The utility model aims to provide a liquid phase dryer filtering system to prevent the flow meter and other pressure-inducing pipes of the downstream equipment pipeline from being blocked or the control valve from being stuck.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A liquid phase dryer filtering system is used for filtering between the dryer and a deethanizer, comprising a filter feed pipe, a filter branch pipe, a filter and a filter discharge pipe, wherein one end of the filter feed pipe is used to communicate with the output port of the dryer, the other end of the filter feed pipe is used to communicate with one end of the filter branch pipe, the other end of the filter branch pipe is used to communicate with one end of the filter discharge pipe, and the other end of the filter discharge pipe is used to communicate with the input port of the deethanizer, at least two filter branches are provided, and at least two of the filter branches are arranged in parallel, at least two filters are provided, and at least two of the filters are arranged on the at least two filter branches in a one-to-one correspondence.

[0007] Preferably, a first valve is provided on the filter branch pipe and between the filter located thereon and the filter feed pipe.

[0008] Preferably, a second valve is provided on the filter branch pipe and between the filter located thereon and the filter discharge pipe.

[0009] Preferably, it also includes a detection branch and a differential pressure transmitter, one end of the detection branch is connected to the filter feed pipe, and the other end of the detection branch is connected to the filter discharge pipe, and the differential pressure transmitter is arranged on the detection branch to detect the pressure difference at both ends of the filter.

[0010] Preferably, a third valve is provided on the detection branch and between the differential pressure transmitter and the filter feed pipe.

[0011] Preferably, a fourth valve is provided on the detection branch and between the differential pressure transmitter and the filter discharge pipe.

[0012] Preferably, a fifth valve is provided on the filter feed pipe.

[0013] Preferably, a sixth valve is provided on the filter discharge pipe.

[0014] Compared with the prior art, the liquid phase dryer filtration system of the utility model has the following beneficial effects:

[0015] In the utility model, the liquid hydrocarbons at the bottom of the buffer tank of the propane dehydrogenation device enter the dryer to remove trace water and then enter the deethanizer to remove light components such as C2. Since the 3A molecular sieve bed in the dryer has relative movement during the process of increasing and decreasing pressure, the molecular sieve particles will be worn and produce powder over a long period of time. The powder will leak along the wire mesh at the top of the dryer and enter the deethanizer, causing the downstream equipment pipeline to be blocked. Therefore, the present application filters the powder generated by the wear of the molecular sieve by setting a liquid dryer filter system between the dryer and the deethanizer to prevent the device on the downstream equipment pipeline from being blocked. Specifically, the filter feed pipe is connected to the dryer, the filter discharge pipe is connected to the deethanizer, the filter branch pipe is connected between the filter feed pipe and the filter discharge pipe, and the filter is provided on the filter branch pipe, so as to filter the powder or molecular sieve particles generated when the molecular sieve particles are worn, so as to prevent the molecular sieve powder or particles from entering the deethanizer and causing the device on the downstream equipment pipeline to be blocked. Then, the present application sets up at least two filters in parallel, so that when one of the filters is in use, the remaining filters are used as spare filters. Furthermore, when one of the filters is blocked, the other filter can be used to filter through, and then the filter element of the blocked filter can be removed for cleaning. After cleaning, it is put back for standby use so as not to delay the filtering work. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the utility model.

[0017] In the figure, 100, dryer; 1, filter feed pipe; 2, filter branch pipe; 3, filter; 4, filter discharge pipe; 5, detection branch; 6, differential pressure transmitter; 7, first valve; 8, second valve; 9, third valve; 10, fourth valve; 11, fifth valve; 12, sixth valve. DETAILED DESCRIPTION

[0018] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0019] In the description of the present utility model, it should be understood that the wording "comprising" used in the present utility model specification refers to the presence of the features, integers, steps, operations, parts / components and / or assemblies, but does not exclude the presence or addition of one or more other features, integers, steps, operations, parts / components, assemblies and / or their groups. It should be understood that when we say that a part / component is "connected" to another part / component, it can be directly connected to the other part / component, or there can be intermediate parts / components. The wording "and / or" used here includes all or any unit and all combinations of one or more associated listed items.

[0020] like Figure 1 As shown, the utility model relates to a liquid phase dryer filtering system, which is used for filtering between the dryer 100 and the deethanizer, and includes a filtering feed pipe 1, a filtering branch pipe 2, a filter 3 and a filtering discharge pipe 4, wherein one end of the filtering feed pipe 1 is used to communicate with the output port of the dryer 100, the other end of the filtering feed pipe 1 is connected to one end of the filtering branch pipe 2, the other end of the filtering branch pipe 2 is connected to one end of the filtering discharge pipe 4, the other end of the filtering discharge pipe 4 is used to communicate with the input port of the deethanizer, at least two filtering branch pipes 2 are provided, and at least two filtering branch pipes 2 are arranged in parallel, at least two filters 3 are provided, and at least two filters 3 are arranged on at least two filtering branch pipes 2 in a one-to-one correspondence.

[0021] In the present invention, the liquid hydrocarbons at the bottom of the buffer tank of the propane dehydrogenation device enter the dryer 100 to remove trace water and then enter the deethanizer to remove light components such as C2. Since the 3A molecular sieve bed in the dryer 100 has relative movement during the pressure increase and decrease process, the molecular sieve particles will be worn and produce powder over a long period of time. The powder will leak along the top wire mesh of the dryer 100 and enter the deethanizer, causing the downstream equipment pipeline to be blocked. Therefore, the present application sets a liquid phase dryer filtration system between the dryer 100 and the deethanizer to remove light components such as C2. The powder generated by the wear of the molecular sieve is filtered to prevent the device on the downstream equipment pipeline from being blocked. Specifically, the filter feed pipe 1 is connected to the dryer 100, the filter discharge pipe 4 is connected to the deethanizer, the filter branch pipe 2 is connected between the filter feed pipe 1 and the filter discharge pipe 4, and the filter 3 is arranged on the filter branch pipe 2, so as to filter the powder or molecular sieve particles generated when the molecular sieve particles are worn, so as to prevent the molecular sieve powder or particles from entering the deethanizer and causing the device on the downstream equipment pipeline to be blocked. Then, the present application is provided with at least two filters 3 in parallel, so that when one of the filters 3 is used, the other filters 3 are used as spare filters 3, and then when one of the filters 3 is blocked, another filter 3 can be used for filtering, and then the filter element of the blocked filter 3 is taken out for cleaning, and after cleaning, it is put back for standby use so as not to delay the filtering work.

[0022] In this embodiment, a first valve 7 is provided on the filter branch pipe 2 and between the filter 3 located thereon and the filter feed pipe 1 , so as to control the conduction and cutoff between the filter 3 and the filter feed pipe 1 .

[0023] Preferably, a second valve 8 is provided on the filter branch pipe 2 and between the filter 3 located thereon and the filter discharge pipe 4 , so as to control the conduction and cutoff between the filter 3 and the filter discharge pipe 4 .

[0024] In this embodiment, the liquid phase dryer filtration system also includes a detection branch 5 and a differential pressure transmitter 6, one end of the detection branch 5 is connected to the filter feed pipe 1, and the other end of the detection branch 5 is connected to the filter discharge pipe 4, and the differential pressure transmitter 6 is arranged on the detection branch 5 to detect the pressure difference at both ends of the filter 3.

[0025] By setting the differential pressure transmitter 6 to detect the differential pressure at both ends of the filter 3, when the differential pressure display value becomes larger than the preset value, the user can be reminded that the filter 3 is seriously clogged and needs to be switched to a spare filter 3. This can monitor the operation of the filter 3 and ensure smooth filtration.

[0026] Preferably, a third valve 9 is provided on the detection branch 5 and between the differential pressure transmitter 6 and the filter feed pipe 1 , so as to control the conduction and cutoff between the differential pressure transmitter 6 and the filter feed pipe 1 .

[0027] Furthermore, a fourth valve 10 is provided on the detection branch 5 and between the differential pressure transmitter 6 and the filter discharge pipe 4 to control the conduction and cutoff between the differential pressure transmitter 6 and the filter discharge pipe 4 .

[0028] In this embodiment, a fifth valve 11 is provided on the filter feed pipe 1 to control the conduction and cutoff of the filter feed pipe 1 .

[0029] Preferably, a sixth valve 12 is provided on the filter discharge pipe 4 to control the conduction and cutoff of the filter discharge pipe 4 .

[0030] In summary, compared with the prior art, the liquid phase dryer filtration system of the present application has a simple structure, low equipment cost, and can prevent the downstream equipment pipeline from being blocked or stuck.

[0031] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principle of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A liquid phase dryer filtration system, used for filtering between the dryer and the deethanizer, characterized in that: It includes a filter feed pipe, a filter branch pipe, a filter and a filter discharge pipe, one end of the filter feed pipe is used to communicate with the output port of the dryer, the other end of the filter feed pipe is connected to one end of the filter branch pipe, the other end of the filter branch pipe is connected to one end of the filter discharge pipe, and the other end of the filter discharge pipe is used to communicate with the input port of the deethanizer, at least two filter branches are provided, and at least two of the filter branches are arranged in parallel, at least two filters are provided, and at least two of the filters are arranged on the at least two filter branches in a one-to-one correspondence.

2. The liquid phase dryer filtration system according to claim 1, characterized in that: A first valve is provided on the filter branch pipe and between the filter located thereon and the filter feed pipe.

3. The liquid phase dryer filtration system according to claim 2, characterized in that: A second valve is provided on the filter branch pipe and between the filter located thereon and the filter outlet pipe.

4. The liquid phase dryer filtration system according to claim 1, characterized in that: It also includes a detection branch and a differential pressure transmitter, one end of the detection branch is connected to the filter feed pipe, and the other end of the detection branch is connected to the filter discharge pipe. The differential pressure transmitter is arranged on the detection branch to detect the pressure difference at both ends of the filter.

5. The liquid phase dryer filtration system according to claim 4, characterized in that: A third valve is provided on the detection branch and between the differential pressure transmitter and the filter feed pipe.

6. The liquid phase dryer filtration system according to claim 5, characterized in that: A fourth valve is provided on the detection branch and between the differential pressure transmitter and the filter discharge pipe.

7. The liquid phase dryer filtration system according to claim 1, characterized in that: The filtering feed pipe is provided with a fifth valve.

8. The liquid phase dryer filtration system according to claim 7, characterized in that: The filtering discharge pipe is provided with a sixth valve.

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