阅读说明：本技术 一种橇装化大罐抽气装置及方法 (Skid-mounted large tank air extraction device and method ) 是由 郄海霞 赵玉君 朱国承 王萌 马勇 李姝仪 李民民 杨东宁 于 2019-11-18 设计创作，主要内容包括：本发明提供一种橇装化大罐抽气装置及方法,包括原油储罐、大罐抽气缓冲罐、抽气压缩机、抽气空冷器、抽气分离器和凝液泵；所述的原油储罐与大罐抽气缓冲罐的进口连接,大罐抽气缓冲罐下端出口与凝液泵连接,大罐抽气缓冲罐上端出口依次与抽气压缩机、抽气空冷器和抽气分离器连接。本发明整套装置由橇组成,便于运输,并可减少现场施工工作量,本发明实现对原油储罐大罐气的回收,保证站场安全。它适用于油田联合站的大罐气回收,处理范围为2000~10000m<Sup>3</Sup>/d。(The invention provides a skid-mounted large tank air extraction device and a skid-mounted large tank air extraction method, wherein the skid-mounted large tank air extraction device comprises a crude oil storage tank, a large tank air extraction buffer tank, an air extraction compressor, an air extraction air cooler, an air extraction separator and a condensate pump; the crude oil storage tank is connected with an inlet of the big tank air-extracting buffer tank, an outlet at the lower end of the big tank air-extracting buffer tank is connected with the condensate pump, and an outlet at the upper end of the big tank air-extracting buffer tank is sequentially connected with the air-extracting compressor, the air-extracting air cooler and the air-extracting separator. The whole set of device is composed of sleds, is convenient to transport, can reduce the workload of site construction, realizes the recovery of the gas in the large tank of the crude oil storage tank, and ensures the safety of a station yard. The method is suitable for large tank gas recovery of an oil field combined station, and the treatment range is 2000-10000 m 3 /d。)

1. The utility model provides a big jar air exhaust device of skid-mounted ization which characterized in that: comprises a crude oil storage tank (1), a large tank air pumping buffer tank (3), an air pumping compressor (4), an air pumping air cooler (5), an air pumping separator (6) and a condensate pump (7); crude oil storage tank (1) and the access connection of big jar air extraction buffer tank (3), big jar air extraction buffer tank (3) lower extreme export is connected with condensate pump (7), big jar air extraction buffer tank (3) upper end export in proper order with air compressor (4), air cooler (5) and take out the gas separator (6) and be connected.

2. A skid-mounted big tank air extraction device according to claim 1, characterized in that: the large tank air-extracting buffer tank (3) is connected with the air-extracting separator (6) through a pipeline, and a low-pressure air-compensating valve (9) is arranged on the pipeline.

3. A skid-mounted big tank air extraction device according to claim 1, characterized in that: the upper end of the gas-pumping separator (6) is provided with a gas outlet, and the lower end is provided with a liquid outlet.

4. A skid-mounted big tank air extraction device according to claim 1, characterized in that: the pressure of the gas from the large tank gas extraction buffer tank (3) is at least 700 Pa.

5. The skid-mounted large tank air extraction method according to any one of claims 1 to 4, characterized in that: the method comprises the following specific steps:

firstly, the volatile big tank gas (2) in a crude oil storage tank (1) firstly enters a big tank gas extraction buffer tank (3) for buffering;

step two, after the gas is buffered by the large tank gas pumping buffer tank (3) in the step one, the large tank gas (2) is separated into condensate (8), and the separated condensate (8) is pressurized by a condensate pump (7) and then is sent to an oil system; the rest of the large tank gas (2) enters an air extraction compressor (4) for pressurization;

step three, after being pressurized by the air pumping compressor (4) in the step two, the mixture enters an air pumping cooler (5) for cooling;

step four, after being cooled by the air cooler (5) in the step three, the gas enters a gas extraction separator (6), and after the condensate (8) is separated, the atmospheric gas (2) enters a downstream device; the condensate (8) separated from the air pumping buffer tank (6) directly enters the oil system.

6. The skid-mounted large tank air extraction method according to claim 5, characterized in that: in the second step, the rest of the large tank gas (2) enters an air extraction compressor (4) for pressurization, and the pressure is increased to 0.3 MPa.

7. The skid-mounted large tank air extraction method according to claim 5, characterized in that: in the third step, the air-extracting air cooler (5) cools to 40 ℃.

8. The skid-mounted large tank air extraction method according to claim 5, characterized in that: and in the second step, the condensate (8) separated from the large tank gas (2) in the large tank gas extraction buffer tank (3) is pressurized to 0.3MPa by a condensate pump (7) and then is sent to an oil system.

9. The skid-mounted large tank air extraction method according to claim 5, characterized in that: when the pressure of the incoming gas of the big tank air exhaust buffer tank (3) is lower than 0-700 Pa, the low-pressure air supplementing valve (9) is opened to supplement air to the big tank air exhaust buffer tank (3).

Technical Field

The invention relates to a skid-mounted large tank air extraction device and method, and belongs to the field of petroleum.

Background

At present, a large number of united stations are built in the Changqing oil field, and most of crude oil in the built united stations is stored in a crude oil storage tank and then is transported out. The crude oil storage tank is a normal pressure storage tank, a breather valve is designed on the top of the tank, and the large tank gas escaping from the breather valve is diffused to the ground, so that the safety of a station site is influenced. Particularly, the large tank gas of part of storage tanks contains hydrogen sulfide with high content and is over 2000ppm when the large tank gas seriously exceeds the standard, and the concentration still exceeds 20ppm after the large tank gas is diffused to the ground, thus seriously threatening the health of staff in a station. Therefore, the large tank gas needs to be recovered, most of the large tank gas extraction devices are distributed at present, the devices and the equipment are more, and the skid forming difficulty is high. By optimizing the process and equipment, skid mounting of the large tank air extraction device is realized, and the large tank air extraction device is particularly suitable for the requirements of the current situation.

Disclosure of Invention

In order to overcome the problems of multiple devices and high skid forming difficulty of the existing device, the invention provides a skid-mounted large tank air extraction device and a skid-mounted large tank air extraction method.

The technical scheme adopted by the invention is as follows:

a skid-mounted large tank air extraction device comprises a crude oil storage tank, a large tank air extraction buffer tank, an air extraction compressor, an air extraction air cooler, an air extraction separator and a condensate pump; the crude oil storage tank is connected with an inlet of the big tank air-extracting buffer tank, an outlet at the lower end of the big tank air-extracting buffer tank is connected with the condensate pump, and an outlet at the upper end of the big tank air-extracting buffer tank is sequentially connected with the air-extracting compressor, the air-extracting air cooler and the air-extracting separator.

The large tank air-extracting buffer tank is connected with the air-extracting separator through a pipeline, and a low-pressure air-compensating valve is arranged on the pipeline.

The upper end of the gas-pumping separator is provided with a gas outlet, and the lower end of the gas-pumping separator is provided with a liquid outlet.

The pressure of the gas from the large tank gas-extracting buffer tank is at least 700 Pa.

A skid-mounted large tank air extraction method comprises the following specific steps:

firstly, feeding the gas in a large tank volatilized from a crude oil storage tank into a gas extraction buffer tank of the large tank for buffering;

step two, after the gas pumping buffer tank of the large tank in the step one buffers, separating condensate from the large tank gas, and pressurizing the separated condensate by a condensate pump and then sending the condensate to an oil system; the rest of the large tank gas enters an air extraction compressor for pressurization;

step three, after the pressure of the air-extracting compressor in the step two is increased, the air-extracting compressor enters an air-extracting cooler for cooling;

step four, after being cooled by the air cooler in the step three, the gas enters a gas extraction separator, and after the condensate is separated out, the atmospheric gas enters a downstream device; the condensate separated from the air pumping buffer tank directly enters the oil system.

In the second step, the rest of the large tank gas enters an air extraction compressor for pressurization, and the pressure of the large tank gas is increased to 0.3 MPa.

And in the third step, the air-extracting air cooler cools the mixture to 40 ℃.

And in the second step, the condensate separated from the large tank gas in the large tank gas extraction buffer tank is pressurized to 0.3MPa by a condensate pump and then is sent to an oil system.

And when the pressure of the incoming gas of the big tank air exhaust buffer tank is lower than 0-700 Pa, the low-pressure air supplementing valve is opened to supplement air to the big tank air exhaust buffer tank.

The invention has the beneficial effects that:

the invention provides a skid-mounted large tank air extraction device and a skid-mounted large tank air extraction method. The method is suitable for large tank gas recovery of an oil field combined station, and the treatment range is 2000-10000 m³/d。

The following will be further described with reference to the accompanying drawings.

Drawings

FIG. 1 is a schematic view of the structural connection of the present invention.

In the figures, the reference numbers are: 1. a crude oil storage tank; 2. gas in a big tank; 3. a large tank air pumping buffer tank; 4. an air extraction compressor; 5. an air cooler for air extraction; 6. a gas extraction separator; 7. a condensate pump; 8. condensing; 9. low-pressure air compensating valve.

Detailed Description