CN214667849U

CN214667849U - High-temperature C4 airtight sampling system

Info

Publication number: CN214667849U
Application number: CN202023204280.8U
Authority: CN
Inventors: 郑豪; 卢春智; 牟兴斌; 周阳; 宋荣伟; 蓝仕东; 宋维民
Original assignee: Dalian Fujia Dahua Petrochemical Co Ltd
Current assignee: Dalian Fujia Dahua Petrochemical Co Ltd
Priority date: 2020-12-28
Filing date: 2020-12-28
Publication date: 2021-11-09
Anticipated expiration: 2030-12-28

Abstract

The utility model relates to a petrochemical technical field specifically is a high temperature C4 airtight sampling system, and high temperature high pressure C4 is responsible for the line connection buffer tank pan feeding pipeline, and buffer tank pan feeding pipeline is connected to the buffer tank after passing through the water-cooled heat exchanger heat transfer, and the buffer tank is responsible for the line through buffer tank discharging pipeline connection to high temperature high pressure C4, buffer tank discharging pipeline is close to buffer tank discharge gate position and establishes to the sampling point, and nitrogen gas pipe connection is to the buffer tank. The utility model can play the roles of safe closed discharge, energy saving and effective recycling; and the operation of sampling the high-temperature high-pressure light component (mainly C4) of the aromatic hydrocarbon plant can be more efficiently completed.

Description

High-temperature C4 airtight sampling system

Technical Field

The utility model relates to a petrochemical technical field specifically is a high temperature C4 airtight sampling system, and it is applicable to the airtight sampling operation of the light component of aromatic factory high temperature high pressure.

Background

Aromatic hydrocarbons generally refer to hydrocarbons having a benzene ring or aromatic ring structure in the molecule, and are one of closed-chain hydrocarbons having a benzene ring basic structure. The aromatic hydrocarbon comprises a benzene derivative "para-xylene", which is one of the xylene isomers, the remaining isomers including ortho-xylene and meta-xylene.

At present, the high-temperature high-pressure light component (mainly C4) of the aromatic hydrocarbon plant is difficult to sample, the high-temperature high-pressure sampling is difficult, and the sampling has safety risk. The pressure is 1MPa, the temperature is 150 ℃, C4 is liquid, the sampling is vaporized instantly, and the safety risk exists. After the improvement, the pressure relief, cooling and safe sampling can be realized.

SUMMERY OF THE UTILITY MODEL

In view of the defects of the prior art, the utility model provides a high-temperature C4 airtight sampling system, which can play the roles of safe airtight discharge, energy saving and effective recycling; and the operation of sampling the high-temperature high-pressure light component (mainly C4) of the aromatic hydrocarbon plant can be more efficiently completed.

In order to achieve the purpose, the utility model provides a technical scheme is the airtight sampling system of high temperature C4, and high temperature high pressure C4 is responsible for the line connection buffer tank pan feeding pipeline, and buffer tank pan feeding pipeline is connected to the buffer tank after passing through the water-cooling heat exchanger heat transfer, and the buffer tank is responsible for the line through buffer tank discharging pipeline connection to high temperature high pressure C4, buffer tank discharging pipeline is close to buffer tank discharge gate position and establishes to the sampling point, nitrogen gas pipe connection to the buffer tank.

Furthermore, a first valve is arranged on a pipeline at the upstream of the water-cooling heat exchanger, a temperature measuring device, a check valve and a fourth valve are sequentially arranged on a pipeline at the downstream of the water-cooling heat exchanger, and the temperature measuring device measures the material outlet temperature of the water-cooling heat exchanger.

Furthermore, a liquid level meter and a buffer tank pressure difference meter are installed on the buffer tank.

Furthermore, a seventh valve is arranged on a discharge pipe line of the buffer tank, and an oil discharge differential pressure gauge is arranged at the position of the seventh valve.

Furthermore, buffer tank discharge pipeline is close to buffer tank discharge gate position and connects the sampling pipeline, sets up first sample valve and second sample valve on the sampling pipeline.

Furthermore, a second valve is arranged on a water outlet pipeline of the water-cooling heat exchanger, and a third valve is arranged on a water inlet pipeline of the water-cooling heat exchanger.

Furthermore, the buffer tank is connected to the flare device through a pipeline, and a fifth valve, a sixth valve and a safety valve are arranged on a pipeline from the buffer tank to the flare device.

On the other hand, the utility model provides a high temperature C4 airtight sampling system, its concrete step is:

step 1: cooling and charging, starting a circulating water flow of the water-cooling heat exchanger, pressurizing a buffer tank to 0.9MPa by using nitrogen, starting a material feeding pipeline of the buffer tank, adjusting the opening degree of a circulating water valve, and monitoring the temperature of a material outlet of the water-cooling heat exchanger to be 20-30 ℃ at normal temperature; the pressure of the buffer tank is ensured to be 0.9MPa by adjusting the pressure relief of a valve between the top of the buffer tank and the flare device, the stable pressure difference of the buffer tank is established to be 0.1MPa, and the liquid level of the buffer tank is established to be 20 percent;

step 2: adjusting the pressure, cutting off a feed pipeline of the buffer tank, and cutting off the buffer tank to a pipeline of the torch device; pressurizing the buffer tank to 1.1MPa through a nitrogen pipeline;

and step 3: replacing, namely confirming that the pressure of the buffer tank is 1.1MPa and the oil discharge pressure difference meter is 0.1MPa, opening a discharge pipeline of the buffer tank, discharging all materials of the buffer tank to a high-temperature high-pressure C4 main pipeline through nitrogen pressure oil, isolating a sampling point from the high-temperature high-pressure C4 main pipeline, and closing nitrogen; after replacement is carried out for many times according to the steps 1-3, the buffer tank is filled with liquid to 20 percent again;

and 4, step 4: sampling, namely decompressing the buffer tank to 0.05MPa, and sampling at a sampling point;

and 5: and (3) oil drainage, namely pressurizing the buffer tank to 1.1MPa, confirming that the pressure difference meter of the drained oil is 0.1MPa, opening a buffer tank discharge pipeline of a sampling point to a high-temperature high-pressure C4 main pipeline, completely discharging the materials of the buffer tank to a high-temperature high-pressure C4 main pipeline through nitrogen pressure oil, isolating the sampling point from the high-temperature high-pressure C4 main pipeline, and closing nitrogen.

The utility model has the advantages that: the effects of safe and closed discharge, energy conservation and effective recycling are achieved; and the operation of sampling the high-temperature high-pressure light component (mainly C4) of the aromatic hydrocarbon plant can be more efficiently completed.

Drawings

FIG. 1 is a process flow diagram of the present invention;

in the figure: 1. high temperature high pressure C4 main line, 2, buffer tank pan feeding pipeline, 2.1, first valve, 2.2, temperature measuring device, 2.3, check valve, 2.4, fourth valve, 3, water-cooling heat exchanger, 3.1, second valve, 3.2, third valve, 4, buffer tank, 4.1, level gauge, 4.2, buffer tank differential pressure gauge, 4.3, manometer, 5, buffer tank discharge pipeline, 5.1, seventh valve, 6, nitrogen pipeline, 7, sample pipeline, 7.1, first sample valve, 7.2, second sample valve, 8, torch device, 8.1, fifth valve, 8.2, sixth valve, 8.3, safety valve.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The utility model provides a high temperature C4 airtight sampling system, is 150 ℃ including the temperature, 0.5 MPa's high temperature high pressure C4 main line 1, and high temperature high pressure C4 main line 1 connects buffer tank pan feeding pipeline 2, and buffer tank pan feeding pipeline 2 is connected to buffer tank 4 through 3 heat exchanges back of water-cooled heat exchanger, and buffer tank 4 is connected to high temperature high pressure C4 main line 1 through buffer tank discharge pipeline 5, buffer tank discharge pipeline 5 is close to buffer tank discharge gate position and establishes to the sampling point, and nitrogen gas pipeline 6 is connected to buffer tank 4. The nitrogen line 6 in this example is a nitrogen line of 2.0 MPa.

Further, a first valve 2.1 is arranged on a pipeline at the upstream of the water-cooling heat exchanger 3, a temperature measuring device 2.2, a check valve 2.3 and a fourth valve 2.4 are sequentially arranged on a pipeline at the downstream of the water-cooling heat exchanger 3, and the temperature measuring device 2.2 measures the material outlet temperature of the water-cooling heat exchanger 3. The temperature measuring device 2.2 is a temperature measuring meter.

Furthermore, a liquid level meter 4.1, a pressure gauge 4.3 and a buffer tank pressure difference gauge 4.2 are arranged on the buffer tank 4.

Furthermore, a seventh valve 5.1 is arranged on the buffer tank discharge pipeline 5, and an oil discharge differential pressure gauge 5.2 is arranged at the position of the seventh valve 5.1.

Further, buffer tank discharge pipeline 5 is close to buffer tank discharge gate position and connects sampling line 7, sets up first sample valve 7.1 and second sample valve 7.2 on the sampling line. It should be noted that the sampling needle valve can be used for sampling.

Furthermore, a second valve 3.1 is arranged on a water outlet pipeline of the water-cooling heat exchanger 3, and a third valve 3.2 is arranged on a water inlet pipeline of the water-cooling heat exchanger 3.

Further, the buffer tank 4 is connected to the flare apparatus 8 through a pipeline, and a fifth valve 8.1, a sixth valve 8.2 and a safety valve 8.3 are arranged on the pipeline from the buffer tank 4 to the flare apparatus 8.

step 1: cooling and filling liquid: confirming that the circulating water flow of the water-cooled heat exchanger 3 is communicated, opening the second valve 3.1 and the third valve 3.2, pressurizing the buffer tank 4 to 0.9MPa by using nitrogen, slightly opening the first valve 2.1 and the fourth valve 2.4 to introduce materials, adjusting the opening degree of circulating water valves (the second valve 3.1 and the third valve 3.2), and monitoring the temperature of the temperature measuring device 2.2 to be reduced to the normal temperature of 20-30 ℃; the pressure of the buffer tank 4 is ensured to be 0.9MPa by adjusting the pressure relief from the top of the buffer tank 4 to the fifth valve 8.1 and the sixth valve 8.2 of the valve of the torch device, the stable pressure difference is established, the pressure difference meter 4.2 of the buffer tank is 0.1MPa, and the liquid level of the buffer tank 4 is established to be 20 percent.

Step 2: adjusting pressure: closing the first valve 2.1 and the fourth valve 2.4, and closing the tank top to the torch valves, namely the fifth valve 8.1 and the sixth valve 8.2; the buffer tank is pressurized to 4 to 1.1MPa by slightly opening 2.0MPa nitrogen.

And step 3: and (3) replacement: confirming that the pressure of the buffer tank 4 is 1.1MPa and the oil discharge pressure difference table 5.2 is 0.1MPa, slightly opening a tank bottom F7 valve, discharging all the materials of the buffer tank to a system pipeline through 2.0MPa nitrogen pressure oil, closing a seventh valve 5.1 for isolation, and closing nitrogen; after 3 times of replacement according to the steps 1-3, the buffer tank 4 is filled up to 20 percent again.

And 4, step 4: sampling: the buffer tank 4 was depressurized to 0.05MPa, and sampled through a sampling needle valve.

And 5: oil discharge: pressurizing the buffer tank 4 to 1.1MPa, confirming that the oil discharge pressure difference meter 5.2 is 0.1MPa, slightly opening a seventh valve 5.1 at the bottom of the tank, discharging all materials in the buffer tank 4 to a high-temperature high-pressure C4 main pipeline 1 through 2.0MPa nitrogen pressure oil, closing the seventh valve 5.1 for isolation, and closing nitrogen. Finally, the effects of safe and closed discharge, energy conservation and effective recycling are achieved.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A high temperature C4 airtight sampling system which characterized in that: high temperature high pressure C4 is responsible for the line connection buffer tank pan feeding pipeline, and buffer tank pan feeding pipeline is connected to the buffer tank after passing through the water-cooling heat exchanger heat transfer, and the buffer tank is connected to high temperature high pressure C4 through buffer tank discharging pipeline and is responsible for the line, buffer tank discharging pipeline is close to buffer tank discharge gate position and establishes to the sampling point, and nitrogen gas pipe connection is to the buffer tank.

2. The high temperature C4 confined sampling system of claim 1, wherein: the pipeline at the upper part of the water-cooling heat exchanger is provided with a first valve, the pipeline at the lower part of the water-cooling heat exchanger is sequentially provided with a temperature measuring device, a check valve and a fourth valve, and the temperature measuring device measures the material outlet temperature of the water-cooling heat exchanger.

3. The high temperature C4 confined sampling system of claim 1, wherein: and a liquid level meter and a buffer tank pressure difference meter are arranged on the buffer tank.

4. The high temperature C4 confined sampling system of claim 1, wherein: and a seventh valve is arranged on a discharge pipe line of the buffer tank, and an oil discharge differential pressure gauge is arranged at the position of the seventh valve.

5. The high temperature C4 confined sampling system of claim 1, wherein: the buffer tank discharge pipeline is close to the buffer tank discharge port and is connected with a sampling pipeline, and a first sampling valve and a second sampling valve are arranged on the sampling pipeline.

6. The high temperature C4 confined sampling system of claim 1, wherein: and a second valve is arranged on a water outlet pipeline of the water-cooling heat exchanger, and a third valve is arranged on a water inlet pipeline of the water-cooling heat exchanger.