CN211384106U - Filtering system of cold box inlet in ethane cracking device - Google Patents

Abstract

The utility model discloses a filtering system of a cold box inlet in an ethane cracking device, which comprises a cold box and a plurality of process pipelines, wherein the filtering system comprises at least two filters, one filter and at least one spare filter are used, valves are arranged on the process pipelines at the front end and the rear end of each filter, the front end of each filter is connected with a torch pipeline, each torch pipeline is gathered to a torch main pipeline, the torch main pipeline is connected to a torch pipe network, and the torch main pipeline is provided with a valve for separating the filtering system and the torch pipe network; the line sizes of the flare line and the flare main line are smaller than the line sizes of the process lines. The utility model discloses reforming transform current filtration system pipeline, add the valve on torch house steward pipeline, isolated filtration system and torch pipe network utilize original small-size torch pipeline to the jumbo size process line among the filtration system to pressurize, operation such as replacement, material saving improves security performance and controllability.

Description

Filtering system of cold box inlet in ethane cracking device

Technical Field

The utility model relates to a filtration system of cooler bin entry in ethane cracker belongs to the chemical industry equipment field.

Background

The yield of ethylene used as a leading head in the chemical industry directly determines the industrial development level of a country. In recent years, various apparatuses for producing ethylene have been built, and it is inevitable that the reduction of the energy consumption of the apparatuses is a major task for various large process patenters and manufacturers in order to allow the apparatuses to survive for a long time in many apparatuses. Therefore, in each large ethylene plant, through a series of technical innovations, it is important to find a way for reducing the energy consumption of the plant.

In an ethylene cracking device, a filter is usually arranged at an inlet of a cold box, as shown in fig. 1, when the pressure difference between the front and the back of the filter a is increased and an operator confirms that the filter a is blocked, the filter a needs to be switched to a standby filter B, the blocked filter a needs to be emptied, replaced, dried and the like, and finally the filter is pressurized, replaced and reserved by using a real material. In the original device, the flare lines of the two filters are converged without a valve, so when the filter is charged with a material, the valve 1 on the process pipeline can be slightly opened manually, then the valve 1 is closed, and then the valve 5 is opened to discharge the flare. In the process, the valve 1 is 36 inches, the valve is too large and is inconvenient to operate, and meanwhile, when the valve 1 is slightly opened, an operator can hardly charge the control material, so that the pressure is increased too fast, and the material with the value higher than the normal value is discharged to a torch, so that waste is caused. Moreover, because the valve size is too big, operating personnel leads to the valve aperture big because the operation is improper very easily, and the material in kind once only fills into too much, can lead to the pipeline obviously to cool down because of the throttling action when passing through the valve, and influence the operation, damage equipment and influence technology operation even. Practice proves that excessive filling of the solid materials can cause leakage at the position of the valve 1, the solid materials are cracking gases, and once the flammable and explosive cracking gases are leaked too much, serious potential safety hazards exist.

Disclosure of Invention

To the defect that exists among the prior art, the utility model discloses an aim at reforms transform the cold box entry filtration system pipeline among the current ethane schizolysis system ethylene device, through add one valve on torch house steward pipeline, effectual isolated filtration system and torch pipe network, operating personnel just can utilize original small-size torch pipeline to pressurize, replace the operation such as operation among the filtration system's jumbo size process line, material saving improves security performance and maneuverability.

The utility model provides a technical scheme that technical problem adopted is: a filtering system of a cold box inlet in an ethane cracking device comprises a cold box and a plurality of process pipelines, wherein the filtering system comprises at least two filters, the at least two filters comprise an operating filter and at least one spare filter, valves are arranged on the process pipelines at the front end and the rear end of each filter, the front end of each filter is connected with a flare pipeline, each flare pipeline is gathered to a flare main pipeline, the flare main pipeline is connected to a flare pipe network, and a valve for isolating the filtering system from the flare pipe network is arranged on the flare main pipeline; the flare line, flare header line have a line size less than the line size of the process line.

Further, the valve on the flare main pipeline is a stop valve or a gate valve.

The valve on the flare main line is preferably a shut-off valve.

Furthermore, the number of the filters is two, and one filter is provided with a first filter and a second filter; the process pipelines at the front end and the rear end of the first filter are respectively provided with a first valve and a second valve, and the process pipelines at the front end and the rear end of the second filter are respectively provided with a third valve and a fourth valve.

Further, a first flare line is arranged on the process pipeline between the first filter and the first valve, a second flare line is arranged on the process pipeline between the second filter and the third valve, and the first flare line and the second flare line are gathered to a flare main pipeline.

Furthermore, a fifth valve is arranged on the first flare pipeline, and a sixth valve is arranged on the second flare pipeline.

Further, the flare line, flare header line, had a line size of 1 inch and the process line had a line size of 36 inches.

The utility model provides a filtration system's of cold box entry working method does: assume that the first filter is a service filter and the second filter is a backup filter. When the process finds that the pressure difference between the front and the back of the first filter is increased in normal operation of the first filter, an operator confirms that the first filter is blocked, and at the moment, the first filter needs to be switched to the second filter. After the filter is correctly switched and delivered for maintenance according to the regulations, an operator needs to perform N2 replacement and drying on the first filter, and finally, the solid material is adopted for pressurization replacement and standby. When the pressurizing replacement of the compacted materials is carried out, the valve on the main flare pipeline is closed, then the fifth valve and the sixth valve are opened, the compacted materials are pressurized for the filter through the first flare pipeline and the second flare pipeline, and the fifth valve and the sixth valve are easy to operate because each flare pipeline is a 1-inch pipeline, and the pressurizing speed of the compacted materials can be controlled, so that when the pressure is slowly charged to a specified value, the sixth valve is closed, finally the valve on the main flare pipeline is opened, and the pressurized materials are discharged to a flare pipeline network, thereby realizing the controllable pressurizing replacement.

The utility model has the advantages that: compared with the prior art, the utility model provides a filtration system of cold box entry reforms transform current filtration system pipeline, through add one valve on torch house steward pipeline, effectual isolated filtration system and torch pipe network, operating personnel just can utilize original small-size torch pipeline to pressurize, replace the operation such as operation in the filtration system to jumbo size technology pipeline, practices thrift the material, improves security performance and controllability.

Drawings

Fig. 1 is a schematic structural diagram of a filtering system at a cold box inlet of an ethane cracking device provided in the present invention.

Wherein, 1-a cold box; 2-a pressure gauge; 3-a second valve; 4-a first filter; 5-a first valve; 6-a fifth valve; 7-a fourth valve; 8-a second filter; 9-a sixth valve; 10-a third valve; 11-a first flare line; 12-a second flare line; 13-a stop valve; 14-flare header line.

Detailed Description

The invention is further illustrated by the following specific examples. These examples are intended to illustrate the invention and are not intended to limit the scope of the invention.

As shown in fig. 1, a filtering system for an inlet of a cold box in an ethane cracking device comprises a cold box 1 and a plurality of process pipelines, wherein the filtering system comprises two filters, namely a first filter 4 and a second filter 8; the process pipelines at the front end and the rear end of the first filter 4 are respectively provided with a first valve 5 and a second valve 3, and the process pipelines at the front end and the rear end of the second filter 8 are respectively provided with a third valve 10 and a fourth valve 7. A first flare pipeline 11 is arranged on the process pipeline between the first filter 4 and the first valve 5, a second flare pipeline 12 is arranged on the process pipeline between the second filter 8 and the third valve 10, a fifth valve 6 is arranged on the first flare pipeline 11, and a sixth valve 9 is arranged on the second flare pipeline 12. The first flare pipeline 11 and the second flare pipeline 12 are gathered to a flare main pipeline 14, the flare main pipeline 14 is connected to a flare pipe network, and a valve for isolating the filtering system from the flare pipe network is arranged on the flare main pipeline 14. The valve on the flare main line 14 is preferably a shut-off valve 13. The flare line, flare main line 14, has a smaller line size than the process line. The flare line, flare main line 14, had a line size of 1 inch and the process line had a line size of 36 inches.

The working mode of the filtering system at the inlet of the cold box is as follows: the first filter 4 is assumed to be a service filter and the second filter 8 is assumed to be a backup filter. During normal operation of the first filter 4, the pressure gauge 2 arranged at the two ends of the filter finds that the front and back pressure difference of the first filter 4 is increased, and the external operator confirms that the first filter 4 is blocked, and at the moment, the first filter 4 needs to be switched to the second filter 8. After the filter is correctly switched and delivered for maintenance according to the regulations, the operator needs to perform N2 replacement and drying on the first filter 4, and finally, the solid material is used for pressurization replacement and standby. When the pressurized replacement of the real materials is carried out, the stop valve 13 on the main flare pipeline 14 is closed, then the fifth valve 6 and the sixth valve 9 are opened, the real materials are pressurized for the filter through the first flare pipeline 11 and the second flare pipeline 12, and the fifth valve 6 and the sixth valve 9 are easy to operate because each flare pipeline is a 1-inch pipeline, and the filling speed of the controlled real materials can be controlled, so that when the pressure is slowly filled to a specified value, the sixth valve 9 is closed, finally the stop valve 13 on the main flare pipeline 14 is opened, and the pressurized materials are discharged to a flare pipe network, thereby realizing the controllable pressurized replacement.

The filtering system at the inlet of the cold box in the ethane cracking device is used for transforming the existing filtering system pipeline, and by additionally arranging the stop valve 13 on the flare main pipeline 14, the filtering system and the flare pipe network are effectively isolated, so that an operator can utilize the original small-size flare pipe to perform operations such as pressurization, replacement and the like on the large-size process pipeline in the filtering system, the materials are saved, and the safety performance and the controllability are improved.

The above embodiments are only used for illustrating the present invention, and not for limiting the present invention, and those skilled in the relevant technical field can make various changes and modifications without departing from the spirit and scope of the present invention, so that all equivalent technical solutions also belong to the scope of the present invention, and the protection scope of the present invention should be defined by the claims.

Claims (6)

1. The utility model provides a filtration system of cold box entry in ethane cracker, includes cold box and a plurality of process line, its characterized in that: the filtering system comprises at least two filters, the at least two filters comprise a commissioning filter and at least one standby filter, valves are arranged on process pipelines at the front end and the rear end of each filter, the front end of each filter is connected with a flare pipeline, the flare pipelines are gathered to a flare main pipeline, the flare main pipeline is connected to a flare pipe network, and the flare main pipeline is provided with a valve for separating the filtering system from the flare pipe network; the flare line, flare header line have a line size less than the line size of the process line.

2. A system for filtering the inlet of a cold box of an ethane cracking unit as defined in claim 1, wherein: and the valve on the torch main pipeline is a stop valve or a gate valve.

3. A system for filtering the inlet of a cold box of an ethane cracking unit as defined in claim 1, wherein: the number of the filters is two, and one filter is provided with a spare filter and is respectively a first filter and a second filter; the process pipelines at the front end and the rear end of the first filter are respectively provided with a first valve and a second valve, and the process pipelines at the front end and the rear end of the second filter are respectively provided with a third valve and a fourth valve.

4. A system for filtering the inlet of a cold box of an ethane cracking unit according to claim 3, wherein: a first flare pipeline is arranged on the process pipeline between the first filter and the first valve, a second flare pipeline is arranged on the process pipeline between the second filter and the third valve, and the first flare pipeline and the second flare pipeline are gathered to a total flare pipeline.

5. The system of claim 4, wherein the cold box inlet of the ethane cracking apparatus comprises: and a fifth valve is arranged on the first flare pipeline, and a sixth valve is arranged on the second flare pipeline.

6. A system for filtering the inlet of a cold box of an ethane cracking unit as defined in claim 1, wherein: the flare line, flare header line, had a line size of 1 inch and the process line had a line size of 36 inches.

Images