阅读说明：本技术 一种废输油管道洁净度定量检测的方法 (Quantitative detection method for cleanliness of waste oil pipelines ) 是由 杨莹 温泉嵩 李昕 张国良 张继军 庞平 宋业恒 瞿帆 孙伟 刘九林 潘吉龙 于 2019-11-01 设计创作，主要内容包括：本发明公开了一种废输油管道洁净度定量检测的方法,涉及输油管道无害化处理技术领域。其包括如下步骤：将质量为g<Sub>1</Sub>的具有吸油性能的计量球从待测输油管道的一端导入,从待测输油管道的另一端接收计量球,记录计量球的质量g<Sub>2</Sub>,计算g<Sub>2</Sub>和g<Sub>1</Sub>的差值,按照上述方法重复导入新的计量球,直到g<Sub>2</Sub>和g<Sub>1</Sub>的差值小于g<Sub>1</Sub>的1％,将累计导入次数的多个计量球重量差g<Sub>2</Sub>-g<Sub>1</Sub>进行求和获得△g,计算△g与用于填充满输油管道的填充物的质量G的比值W。本发明提供的方法实现了定量检测输油管道中残留石油烃,为施工单位或业主控制清洗程度,保障输油管道无害化处置提供了解决方法,填补了国内对管道清洗洁净度检测方法的空白。(The invention discloses a method for quantitatively detecting the cleanliness of a waste oil conveying pipeline, and relates to the technical field of harmless treatment of oil conveying pipelines. Which comprises the following steps: the mass is g 1 The metering ball with oil absorption performance is led in from one end of the oil pipeline to be measured, the metering ball is received from the other end of the oil pipeline to be measured, and the mass g of the metering ball is recorded 2 Calculate g 2 And g 1 Until g, a new ball is introduced repeatedly in the above-mentioned manner 2 And g 1 Is less than g 1 1% of (a), a plurality of weight differences g of the balls to be introduced cumulatively 2 ‑g 1 And summing to obtain △ G, and calculating the ratio W of the mass G of △ G and the mass G of the filler for filling the oil pipeline.)

1. A method for quantitatively detecting the cleanliness of a waste oil pipeline is characterized by comprising the following steps: the mass is g₁The metering ball with oil absorption performance is led in from one end of the oil pipeline to be measured, the metering ball is received from the other end of the oil pipeline to be measured, and the mass g of the metering ball is recorded₂Calculate g₂And g₁Until g, a new ball is introduced repeatedly in the above-mentioned manner₂And g₁Is less than g₁1% of (a), a plurality of weight differences g of the balls to be introduced cumulatively₂-g₁And summing to obtain △ G, and calculating the ratio W of △ G to the mass G of the filler for filling the oil pipeline, wherein the interference rate of the metering ball and the inner wall of the oil pipeline to be measured is 3-5%.

2. The method of claim 1, wherein the metering ball is a resilient ball;

preferably, the elastic ball is a foam ball;

preferably, the foam ball is made of an oleophilic and hydrophobic material;

preferably, the foam ball is made of polyurethane sponge or modified polyurethane sponge.

3. The method according to claim 1, further comprising judging the cleanliness of the oil pipeline to be tested, and if the ratio W of △ G to G is less than or equal to 100ug/G, judging that the oil pipeline to be tested is cleaned, and if the ratio W of △ G to G is greater than 100ug/G, judging that the oil pipeline to be tested needs to be cleaned continuously.

4. The method of claim 1, wherein the metering ball is introduced from the inlet end of the oil pipeline under test using compressed gas.

5. Method according to claim 4, characterized in that the compressed gas can be compressed air or compressed nitrogen, preferably compressed air.

6. The method of claim 5, wherein the pressure of the compressed gas is 0.1 to 0.4 MPa.

7. The method of claim 1, wherein the filler is a earthen material, concrete, or a curable bentonite mud.

8. The method according to claim 1, wherein the mass G of the filler is calculated from the internal volume of the oil pipeline to be tested and the density of the filler, and the internal volume of the oil pipeline to be tested is calculated from the length and the inner diameter of the oil pipeline to be tested.

9. The method of claim 8, wherein the filler has a density of 0.5 to 5 x 10³kg/m³。

Technical Field

The invention relates to the technical field of harmless treatment of oil pipelines, in particular to a method for quantitatively detecting the cleanliness of a waste oil pipeline.

Background

At present, partial oil and gas pipelines in China operate for more than 40 years, the pipelines enter the accident multi-occurrence stage, the hidden danger of pipeline leakage is serious, and a plurality of oil and gas pipelines are in urgent need of upgrading and reconstructing. In addition, due to the adjustment of oil sources, some pipelines need to be changed in route, and some pipelines are shut down or idle, so that a large number of waste pipelines are generated, and the future natural environment and human safety can be endangered if the waste pipelines are not subjected to reasonable harmless treatment.

There is no general practice for harmless treatment of waste pipelines internationally, but the cleaning of residues in pipelines is the first link for harmless treatment of waste pipelines. At present, the common method in China is as follows: firstly, thoroughly cleaning a pipeline needing harmless treatment, and then selecting treatment modes such as filling, dismantling and the like according to the pipe diameter, the buried depth and the land use type.

The cleaning method of the pipeline mainly comprises cleaning of a pipe cleaner, steam cleaning, chemical cleaning and the like. The cleaning method aims to clean the residues in the pipeline to the maximum extent. So far, a scientific and rigorous detection method is lacked for judging whether the pipeline is cleaned or not in our country. The method mainly adopted in engineering comprises the following steps: 1. wiping the inner wall of the pipeline and observing whether oil stains exist; 2. opening a sampling port or a flange to observe whether obvious solid or wax exists or not; 3. and detecting whether combustible gas exists or not by using a four-in-one combustible gas detector. Wherein, the methods 1 and 2 are based on subjective observation and judgment, and the cleanliness of the pipeline cannot be quantified; in method 3, the combustible gas concentration does not represent the degree of cleaning of the pipeline inner wall residue, since some of the residue is not volatile.

Therefore, an easy-to-operate and quantifiable method for detecting the degree of cleanliness is not available at present, and the cleaning and the degree of cleanliness of the pipeline are operated by construction units according to construction experiences, so that the owner cannot really control and master the cleaning degree of the pipeline. The harmless disposal of the waste pipeline cannot be fundamentally guaranteed.

In view of this, the invention is particularly proposed.

Disclosure of Invention

The invention aims to provide a method for quantitatively detecting the cleanliness of a waste oil pipeline so as to solve the technical problem.

The use premise of the invention is as follows: the waste oil pipeline is cleaned by adopting a steam cleaning or chemical cleaning agent to the extent that no oil stain is visually observed and the pipe wall is in the natural color of metal.

The invention is realized by the following steps:

method for quantitatively detecting cleanliness of waste oil pipelines and package thereofThe method comprises the following steps: the mass is g₁The metering ball with oil absorption performance is led in from one end of the oil pipeline to be measured, the metering ball is received from the other end of the oil pipeline to be measured, and the mass g of the metering ball is recorded₂Calculate g₂And g₁Until g, a new ball is introduced repeatedly in the above-mentioned manner₂And g₁Is less than g₁1% of (a), a plurality of weight differences g of the balls to be introduced cumulatively₂-g₁And summing to obtain △ G, and calculating the ratio W of △ G to the mass G of the filler for filling the oil pipeline, wherein the interference rate of the metering ball and the inner wall of the oil pipeline to be measured is 3-5%.

After the inventor repeatedly tests and verifies, the inventor finds that when g is controlled₂And g₁Is less than g₁When the cleanliness of the waste oil pipelines is 1%, the quantitative detection of the cleanliness of the waste oil pipelines is reasonable.

Because the adsorption capacity of the metering ball is limited, the petroleum hydrocarbon remained on the inner wall can not be completely taken out once, and the petroleum hydrocarbon is required to be introduced for many times. When g is₂And g₁When the difference is less than 1% of g1, the residual petroleum hydrocarbon on the inner wall of the waste oil pipeline is negligible.

The approximate mass of the residual total petroleum hydrocarbon of the oil pipeline can be obtained through the mass difference of the plurality of metering balls before and after entering the oil pipeline to be tested, and whether the oil pipeline meets the environmental protection requirement is determined according to the proportion W of the approximate mass of the residual total petroleum hydrocarbon to the mass G of the subsequent pipeline filler. The metering ball passes through the oil pipeline to be tested under the action of the pushing force, and all residual petroleum hydrocarbon on the inner wall of the oil pipeline to be tested is taken out. Thus in the value of mass g₂Greater than mass g₁。g₂And g₁The difference in (d) is the approximate mass of residual total petroleum hydrocarbons.

The ball receiving and sending barrels referred in the embodiments are conventional ball receiving and sending barrels in the prior art. The ball collecting barrel and the ball serving barrel are respectively connected with the ball outlet end and the ball inlet end of the oil conveying pipe to be tested through flanges.

In a preferred embodiment of the present invention, the measuring ball is an elastic ball;

preferably, the elastic ball is a foam ball;

preferably, the foam ball is made of an oleophilic and hydrophobic material.

The metering ball is arranged to be an elastic ball, so that the metering ball and the inner wall of the oil pipeline to be tested can have certain interference rate, and the metering ball with certain interference rate can scrape and clean the pipeline again. The oleophylic and hydrophobic material is favorable for the residual petroleum molecules on the inner wall of the pipeline to be adsorbed on the metering ball.

The excessive interference rate of the metering ball is not favorable for the metering ball to pass through the pipeline, and the too small interference rate is not favorable for the metering ball to adsorb residual petroleum hydrocarbon, so that the detection is inaccurate.

In a preferred embodiment of the present invention, the foam ball is made of polyurethane sponge or modified polyurethane sponge. Polyurethane sponge or modified sponge has the advantage of low cost.

In a preferred embodiment of the present invention, the method further includes determining cleanliness of the oil pipeline to be tested, determining that the oil pipeline to be tested is cleaned if a ratio W of △ G to G is less than or equal to 100ug/G, and determining that the oil pipeline to be tested needs to be cleaned continuously if a ratio W of △ G to G is greater than 100 ug/G.

The first-level standard value limit value of the total petroleum hydrocarbon content in the national soil environment quality standard (GB15618-2008) is 100 mug/g. In order to realize harmless treatment of the oil pipeline, the invention controls the total petroleum hydrocarbon content of the oil pipeline to be detected to be lower than 100 mu g/g.

In the preferred embodiment of the invention, the metering ball is introduced from the inlet end of the oil pipeline to be measured by using compressed gas. The compressed gas may be compressed air or compressed nitrogen, and is preferably compressed air. The compressed gas is used for pushing the metering ball to pass through the oil pipeline.

In the preferred embodiment of the present invention, the pressure of the compressed gas is 0.1-0.5 MPa. Under the pressure, the metering ball can slowly pass through an oil pipeline to be measured at a constant speed, and can efficiently adsorb residual petroleum hydrocarbon.

In the preferred embodiment of the present invention, the filler is a soil material, and may be ordinary soil, or curable bentonite slurry, concrete, etc. The filler is used for harmless treatment of the oil pipeline, and aims to play a role in supporting the pipeline and avoid land settlement or floating of the pipeline (the pipeline in a water body) caused by empty pipelines.

In a preferred embodiment of the present invention, the mass G of the filler is calculated according to the internal volume of the oil pipeline to be measured and the density of the filler, and the internal volume of the oil pipeline to be measured is calculated according to the length and the inner diameter of the oil pipeline to be measured.

The type of the filler is determined according to the terrain in which the pipeline is located. In the preferred embodiment of the present invention, the density of the filler is 0.5-5 × 10³kg/m³。

The invention has the following beneficial effects:

the invention provides a method for quantitatively detecting the cleanliness of a waste oil pipeline, which can obtain the approximate mass of residual total petroleum hydrocarbon of the oil pipeline through the mass difference of a metering ball before and after the waste oil pipeline enters and exits the oil pipeline to be detected, and determine whether the oil pipeline meets the environmental protection requirement according to the proportion W of the approximate mass of the residual total petroleum hydrocarbon to the mass G of a subsequent pipeline filler. The method provided by the invention realizes quantitative detection of residual petroleum hydrocarbon in the oil pipeline, provides a solution for controlling the cleaning degree of a construction unit or a proprietor and guaranteeing harmless disposal of the oil pipeline, and fills the gap of the domestic method for detecting the cleaning cleanliness of the pipeline.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.

The features and properties of the present invention are described in further detail below with reference to examples.