阅读说明：本技术 一种罐箱的清洗方法 (Tank cleaning method ) 是由 章本俭 栾智俊 孙中杭 刘敏军 李卫东 沈超 钱磊 石佑建 王科 于 2021-09-02 设计创作，主要内容包括：本发明公开了一种罐箱的清洗方法,所述罐箱的清洗方法包括：将所述罐箱内的气体置换为惰性保护气体；将完成置换的罐箱内的气体置换为空气；对完成置换的罐箱进行清洗。本发明的罐箱的清洗方法,能大大降低清洗中闪爆的风险。(The invention discloses a tank cleaning method, which comprises the following steps: replacing the gas in the tank with an inert shielding gas; replacing the gas in the tank after the replacement with air; and cleaning the tank after replacement. The cleaning method of the tank can greatly reduce the risk of flash explosion in cleaning.)

1. A method of cleaning a tank, the method comprising:

replacing the gas in the tank with an inert shielding gas;

replacing the gas in the tank after the replacement with air;

and cleaning the tank after replacement.

2. The method of cleaning a tank of claim 1, wherein said replacing the gas in the tank with an inert shielding gas comprises:

connecting an inert protective gas conveying pipeline to a liquid discharge valve of the tank, and connecting a gas recovery pipeline to an exhaust valve of the tank; and introducing inert protective gas into the tank through the drain valve, and discharging gas in the tank through the exhaust valve to replace the gas in the tank.

3. The method of cleaning a tank according to claim 2, wherein the method of cleaning a tank further comprises, before the gas in the tank is replaced by introducing an inert protective gas into the tank through the drain valve and discharging the gas in the tank through the vent valve:

starting a nitrogen making machine, inputting the made nitrogen into a nitrogen storage tank, wherein the nitrogen storage tank is communicated with the inert protective gas conveying pipeline; the inert protective gas is nitrogen.

4. The method of cleaning a tank of claim 2, further comprising:

and detecting the concentration of the nitrogen in the gas recovery pipeline, and when the concentration of the nitrogen reaches a first preset concentration, finishing the step of replacing the gas in the tank with inert protective gas.

5. The method of cleaning a tank of claim 2, wherein the method of cleaning a tank in the process of replacing the gas in the tank with an inert shielding gas further comprises:

and carrying out acid washing spraying and/or alkali washing spraying on the gas in the gas recovery pipeline.

6. The method of cleaning a tank of claim 2, wherein the method of cleaning a tank in the process of replacing the gas in the tank with an inert shielding gas further comprises:

and carrying out at least two-stage active carbon adsorption treatment on the gas in the gas recovery pipeline.

7. The method of cleaning a tank of claim 2, wherein the replacing the gas in the tank that has completed the replacement with air comprises:

dismantling the inert protective gas conveying pipeline;

connecting an air delivery conduit to a drain of the tank;

and controlling an air conveying device to convey compressed air into the tank box through the air conveying pipeline to replace the gas in the tank box.

8. The method of cleaning a tank of claim 7, further comprising:

and detecting the oxygen concentration in the gas recovery pipeline, and when the oxygen concentration reaches a second preset concentration, finishing the step of replacing the gas in the tank box which is completely replaced with the air.

9. A method of cleaning a tank according to claim 7, wherein cleaning the tank after completion of the replacement comprises:

the air conveying pipeline is dismantled, a wastewater recovery pipeline is connected to the drain valve of the tank,

and (3) putting cleaning equipment or part of the cleaning equipment into the tank box from a manhole at the top of the tank box, and cleaning the tank box until the cleaning is finished.

10. The method of cleaning a tank of claim 1 wherein prior to said replacing the gas in the tank with inert shielding gas, the method of cleaning a tank further comprises:

an electrostatic grounding clip is used to clamp the electrostatic grounding point of the tank.

Technical Field

The invention relates to the technical field of cleaning, in particular to a tank cleaning method.

Background

An International Standard TANK (ISO TANK) is a stainless steel pressure vessel installed in a fastening outer frame, and a TANK body inner container is mostly made of 316 stainless steel. Most tanks have steam or electric heating means, inert gas shielding, pressure reduction and other optional equipment for fluid transport and handling. The periphery of the tank body is provided with a corner bearing frame which plays roles in protection and hoisting. The outer frame dimensions of the tank are exactly the same as the dimensions of an international standard 20 foot container (20 feet long, 8 feet wide, 8 feet high, 6 inches). Can be used for road, railway and water transportation.

ISO TANK is also used for shipping flammable liquids, requiring TANK cleaning after shipment. However, since the tank body still has flammable liquid and flammable gas generated thereby, flash explosion is easy to occur in the cleaning process.

Disclosure of Invention

In view of this, it is desirable to provide a method for cleaning a tank, which can reduce the risk of flash explosion during cleaning.

In order to achieve the above purpose, the technical solution of the embodiment of the present invention is realized as follows:

the embodiment of the invention provides a tank cleaning method, which comprises the following steps:

replacing the gas in the tank with an inert shielding gas;

replacing the gas in the tank after the replacement with air;

and cleaning the tank after replacement.

In the above aspect, the replacing the gas in the tank with the inert shielding gas includes:

connecting an inert protective gas conveying pipeline to a liquid discharge valve of the tank, and connecting a gas recovery pipeline to an exhaust valve of the tank; and introducing inert protective gas into the tank through the drain valve, and discharging gas in the tank through the exhaust valve to replace the gas in the tank.

In the above aspect, before the gas in the tank is replaced by introducing an inert shielding gas into the tank through the drain valve and discharging the gas in the tank through the exhaust valve, the method for cleaning the tank further includes:

starting a nitrogen making machine, inputting the made nitrogen into a nitrogen storage tank, wherein the nitrogen storage tank is communicated with the inert protective gas conveying pipeline; the inert protective gas is nitrogen.

In the above scheme, the tank cleaning method further includes:

and detecting the concentration of the nitrogen in the gas recovery pipeline, and when the concentration of the nitrogen reaches a first preset concentration, finishing the step of replacing the gas in the tank with inert protective gas.

In the above aspect, the method for cleaning a tank may further include, in the process of replacing the gas in the tank with an inert shielding gas:

and carrying out acid washing spraying and/or alkali washing spraying on the gas in the gas recovery pipeline.

In the above aspect, the method for cleaning a tank may further include, in the process of replacing the gas in the tank with an inert shielding gas:

and carrying out at least two-stage active carbon adsorption treatment on the gas in the gas recovery pipeline.

In the above aspect, the replacing the gas in the tank after the replacement with air includes:

dismantling the inert protective gas conveying pipeline;

connecting an air delivery conduit to a drain of the tank;

and controlling an air conveying device to convey compressed air into the tank box through the air conveying pipeline to replace the gas in the tank box.

In the above scheme, the tank cleaning method further includes:

and detecting the oxygen concentration in the gas recovery pipeline, and when the oxygen concentration reaches a second preset concentration, finishing the step of replacing the gas in the tank box which is completely replaced with the air.

Among the above-mentioned scheme, wash the tank case of accomplishing the replacement, include:

the air conveying pipeline is dismantled, a wastewater recovery pipeline is connected to the drain valve of the tank,

and (3) putting cleaning equipment or part of the cleaning equipment into the tank box from a manhole at the top of the tank box, and cleaning the tank box until the cleaning is finished.

In the above aspect, before the replacing the gas in the tank with the inert shielding gas, the method for cleaning the tank further includes:

an electrostatic grounding clip is used to clamp the electrostatic grounding point of the tank.

According to the cleaning method of the tank, the combustible gas generated by the combustible liquid is removed through two times of replacement, so that the tank is safer to clean; wherein, the replacement of the inert protective gas utilizes the property of the inert protective gas, thereby greatly reducing the risk of flash explosion of the combustible gas in the replacement; the replacement with air allows the cleaning to be carried out smoothly, avoiding the risk of suffocation of the operator before or during cleaning. Therefore, the cleaning method of the tank box provided by the embodiment of the invention can greatly reduce the risk of flash explosion in cleaning.

Other beneficial effects of the embodiments of the present invention will be further described in conjunction with the specific technical solutions in the detailed description.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that are required to be used in the description of the embodiments will be briefly described below. It should be understood that the drawings described below are only a part of the drawings of the embodiments of the present invention, and that other drawings may be obtained by those skilled in the art without inventive effort.

FIG. 1 is a schematic flow chart of a tank cleaning method according to an embodiment of the present invention.

Detailed Description

Aiming at the problems in the prior art, the embodiment of the invention provides a tank cleaning method, which comprises the following steps:

replacing the gas in the tank with an inert shielding gas;

replacing the gas in the tank after the replacement with air;

and cleaning the tank after replacement.

According to the cleaning method of the tank, disclosed by the embodiment of the invention, through twice replacement, combustible gas generated by combustible liquid is removed, so that the cleaning is safer; wherein, the replacement of the inert protective gas utilizes the property of the inert protective gas, thereby greatly reducing the risk of flash explosion of the combustible gas in the replacement; the replacement with air allows the cleaning to be carried out smoothly, avoiding the risk of suffocation of the operator before or during cleaning. Therefore, the cleaning method of the tank box provided by the embodiment of the invention can greatly reduce the risk of flash explosion in cleaning.

The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Also, the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from these embodiments without inventive step, are within the scope of protection of the present invention.

The embodiment provides a tank cleaning method, as shown in fig. 1, the tank cleaning method includes:

step 101: replacing the gas in the tank with an inert shielding gas;

step 102: replacing the gas in the tank after the replacement with air;

step 103: and cleaning the tank after replacement.

Here, the TANK is exemplarily ISO TANK, and it is understood that other TANK is possible.

Combustible gas generated by the combustible liquid is removed through twice replacement, so that the cleaning is safer; wherein, the replacement of the inert protective gas utilizes the property of the inert protective gas, thereby greatly reducing the risk of flash explosion of the combustible gas in the replacement; the replacement with air allows the cleaning to be carried out smoothly, avoiding the risk of suffocation of the operator before or during cleaning. Therefore, the cleaning method of the tank box provided by the embodiment of the invention can greatly reduce the risk of flash explosion in cleaning.

According to an alternative embodiment of the present invention, in step 101, the replacing the gas in the tank with an inert shielding gas includes:

connecting an inert protective gas conveying pipeline to a liquid discharge valve of the tank, and connecting a gas recovery pipeline to an exhaust valve of the tank; and introducing inert protective gas into the tank through the drain valve, and discharging gas in the tank through the exhaust valve to replace the gas in the tank.

Here, the drain valve and the exhaust valve may be located at opposite ends of the tank, for example, so that the degree of air convection may be increased to make the replacement more efficient and thorough.

Here, for example, in a specific operation, it is necessary to connect the inert shielding gas delivery pipe to the drain valve first, connect the gas recovery pipe to the exhaust valve, output the inert shielding gas, and open the drain valve and the exhaust valve again, in a non-changeable order. So as to prevent air outside the tank from entering the tank and mixing with gas in the tank to form mixed gas which is likely to reach the explosion limit of materials in the tank and is easy to form flash explosion if static electricity or sparks exist on site.

Here, the drain valve is typically disposed at the bottom of the ISO TANK, and the vent valve is typically disposed at the top of the ISO TANK, for example, so that the gas in the TANK can be more easily discharged.

Here, for example, one end of the inert shielding gas delivery pipe is connected to the tank box, and the other end of the inert shielding gas delivery pipe may be connected to an inert shielding gas storage tank or may be directly connected to an inert shielding gas generation device.

Here, for example, during the replacement process, the other ports are all closed except for the drain valve and the vent valve, so that the replacement efficiency is higher.

According to an alternative embodiment of the present invention, before the inert shielding gas is delivered to the tank through the inert shielding gas delivery pipe to replace the gas in the tank, the method further comprises:

starting a nitrogen making machine, inputting the made nitrogen into a nitrogen storage tank, wherein the nitrogen storage tank is communicated with the inert protective gas conveying pipeline; the inert protective gas is nitrogen.

Through the nitrogen storage tank, continuous and stable inert protective gas can be provided for replacement, so that the replacement process is more stable and the efficiency is higher.

According to an optional embodiment of the present invention, in step 101, the method for cleaning a tank further includes:

and detecting the concentration of the nitrogen in the gas recovery pipeline, and when the concentration of the nitrogen reaches a first preset concentration, finishing the step of replacing the gas in the tank with inert protective gas.

Therefore, whether the combustible gas in the tank box is replaced or not can be measured, and the method is safer and more reliable.

Here, the first predetermined concentration may be 99.9%, which may indicate that the combustible gas is substantially purged, or that the risk of flash explosion is substantially eliminated.

According to an alternative embodiment of the present invention, in step 101, the method for cleaning a tank during the process of replacing the gas in the tank with an inert shielding gas further comprises:

and carrying out acid washing spraying and/or alkali washing spraying on the gas in the gas recovery pipeline.

In this way, the gas in the recovery line can be purified for further processing.

According to an alternative embodiment of the present invention, in step 101, the method for cleaning a tank during the process of replacing the gas in the tank with an inert shielding gas further comprises:

and carrying out at least two-stage active carbon adsorption treatment on the gas in the gas recovery pipeline.

In this way, the gas in the recovery line can be further purified for further processing.

In accordance with an alternative embodiment of the present invention, in step 102,

the replacement of the gas in the tank after the replacement into air includes:

dismantling the inert protective gas conveying pipeline;

connecting an air delivery conduit to a drain of the tank;

and controlling an air conveying device to convey compressed air into the tank box through the air conveying pipeline to replace the gas in the tank box.

As described above, the drain valve and the exhaust valve are respectively located at the opposite ends, i.e., the bottom and the top, of the tank, so that the degree of air convection can be increased, the replacement can be more efficient and thorough, and the gas in the tank can be more easily exhausted.

Here, for example, during the replacement process, the other ports are all closed except for the drain valve and the vent valve, so that the replacement efficiency is higher.

According to an alternative embodiment of the present invention, in step 102, the method for cleaning a tank further includes:

and detecting the oxygen concentration in the gas recovery pipeline, and when the oxygen concentration reaches a second preset concentration, finishing the step of replacing the gas in the tank box which is completely replaced with the air.

Here, the purpose of replacing nitrogen is exemplarily to avoid suffocation of staff, and therefore, the concentration of oxygen needs to be detected to ensure that the replaced air has enough oxygen to ensure the personal safety of staff.

Here, the second preset concentration may be, for example: 19.5-21.5%, and the concentration range is suitable for human breath and is safer. It is to be noted here that the second predetermined concentration has an upper limit in addition to a lower limit, since too high an oxygen concentration is also disadvantageous for humans.

According to an alternative embodiment of the invention, the step 103 of cleaning the tank after the replacement comprises:

the air conveying pipeline is dismantled, a wastewater recovery pipeline is connected to the drain valve of the tank,

and (3) putting cleaning equipment or part of the cleaning equipment into the tank box from a manhole at the top of the tank box, and cleaning the tank box until the cleaning is finished.

Here, the top manhole refers to an open hole structure for a person to enter and exit the TANK in ISO TANK, for example, in order to perform installation, inspection, and safety inspection.

Here, the cleaning is exemplarily performed by a cleaning apparatus, which is generally attached with at least one cleaning head or cleaning gun having various functions, which can be entered into a tank to be cleaned as needed and automatically cleaned according to the setting of a program in the cleaning apparatus.

Here, for example, if the cleaning device is a small intelligent cleaning device like a sweeping robot, the whole cleaning device can enter the tank for cleaning.

According to an alternative embodiment of the invention, before said replacing the gas inside the tank with inert shielding gas, the method further comprises:

an electrostatic grounding clip is used to clamp the electrostatic grounding point of the tank.

Therefore, the flash explosion of combustible gas caused by static electricity can be avoided, and the method is safer.

It should be noted that 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 like elements in a process, method, article, or apparatus that comprises the element.

In the description of the embodiments of the present invention, the term "connected" should be interpreted broadly unless otherwise indicated and limited. For example, the two elements may be electrically connected, or may be connected through an intermediate member, directly or indirectly. The specific meaning of the above terms can be understood by those of ordinary skill in the art as appropriate.

It should be understood that, in various embodiments of the present invention, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention. The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.

In the embodiments of the present invention, if the terms "first \ second \ third" are used, they are only used to distinguish similar objects, and do not represent a specific ordering for the objects. It is to be understood that the terms first, second, and third, where permissible, are interchangeable in particular order or sequences.

The individual features described in the embodiments can be combined in any suitable manner without departing from the scope, for example different embodiments and aspects can be formed by combining different features. In order to avoid unnecessary repetition, various possible combinations of the specific features of the invention will not be described further.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, and any modifications, equivalents, improvements, etc. that are within the spirit and principle of the present invention should be included in the present invention.