CN215089567U - Double-vertical-pipe type floating roof storage tank mechanical cleaning system and device - Google Patents

Abstract

The utility model relates to a two riser formula floating roof storage tank machinery cleaning system and device, include vacuum suction device (5), by washing storage tank (8), oil receiving storage tank (11) and oil water separator (14), oil receiving storage tank (11) on be provided with suction line (7), first standpipe (15) and second standpipe (16) respectively, this oil receiving storage tank (11) in arrange the tank deck cleaning machine injection system who links to each other with first standpipe (15) and second standpipe (16), suction line (7) one end link to each other with vacuum suction device (5), vacuum suction device (5) on parallel arrangement transfer pipeline (10), first washing pipeline (20) and second washing pipeline (21). The utility model discloses a new two riser formula machinery wash, on the basis of guaranteeing safety, can improve the operating efficiency by a wide margin to can realize safe, intelligent, the high-efficient washing of large-scale floating roof storage tank.

Description

Double-vertical-pipe type floating roof storage tank mechanical cleaning system and device

Technical Field

The utility model relates to a storage tank washs technical field, especially relates to a two riser formula floating roof storage tank machinery cleaning system and device.

Background

In recent years, while the petrochemical industry is greatly developed, new requirements are continuously provided for safety management of petroleum storage and transportation, and the safety operation and management of petroleum storage and transportation can not leave the cleaning industry of storage tanks, wherein the cleaning work of a large floating roof storage tank is the most complicated and the time is the most consumed. For example, using the existing mechanical cleaning equipment to clean a 10 ten thousand square crude oil floating roof storage tank, the whole construction period needs at least more than 2 months, and the operation is extremely time-consuming and labor-consuming.

The floating roof storage tank is generally used for storing crude oil, and after the storage tank is used for a period of time, due to the continuous accumulation of solid impurities, heavy components and the like contained in the crude oil, the oil sludge at the bottom of the tank is gradually increased, which inevitably affects the quality of oil products. If the storage tank is cleaned irregularly, the quality of the oil stored in the tank is seriously influenced, the effective volume of the storage tank is reduced, the heating efficiency of the storage tank is reduced, and energy waste is caused. In addition, the tank must be cleaned when another type of oil is being changed or when a leak or other damage to the tank requires emptying inspection or fire repair. For cleaning of crude oil storage tanks, the prior art mainly has the following.

One-step and manual can cleaning method

The manual tank cleaning method is an oil tank cleaning method still used in some places at present, aiming at most small oil storage tanks, such as storage tanks below 1000, the manual tank cleaning method needs to adopt a whole set of explosion-proof equipment and tools, operating personnel is equipped with professional protective tools, the storage tank is kept in forced ventilation in the whole operation process, and measures such as monitoring gas components in the tank in real time are taken. The personnel workload is large, the operation environment is poor, and aiming at the safety problem of manual tank cleaning, although various safety operation standards are formulated by the nation, the industry and the enterprises, accidents are frequent, meanwhile, the manual cleaning method has the defects of incomplete cleaning, long shutdown time of the cleaned storage tank and the like, does not meet the safety, energy saving and environmental protection requirements advocated at present, and is being replaced by a mechanical cleaning method.

Second, crushing and dissolving mechanical cleaning method

The method is represented by the Japanese Dafeng COW technology, and the basic theory is that the spraying principle is utilized, the light component in the tank is sprayed out through an automatically rotatable spraying cleaning machine inserted into the tank, jet flow is formed in the tank, so that the sediment in the tank is suspended and diffused and is fully mixed with the light component, the sediment with poor fluidity and even without fluidity is reduced into flowable disperse phase or mixed oil, and the reduced oil is transferred out, so that the aim of reasonable recovery is fulfilled. The process is the most widely used process in China at present and has the purpose of oil recovery, but the number of the jet cleaning machines driven by the device for one time is small (only 1-2), so that the whole operation time of the cleaning machine is long, and the field cleaning operation time is too long.

Three, large flow disturbance mechanical cleaning method

The method is represented by American Mesowang technology, the basic theory is that strong fluid disturbance is formed in a tank by using a disturbance principle and through 2-3 jet flows of a large-flow cleaning gun, and under the action of disturbance, sediments at the bottom of the tank are continuously mixed with light components, so that the aim of eliminating the sediments is fulfilled. When the process is used, a large amount of flowable oil is needed in the tank, the floating roof is usually in a floating state, no gas phase space exists in the tank, nitrogen is not needed to be injected into the tank, the safety is high, but the heavy components in all regions in the tank cannot be guaranteed to flow in the oil rotary mixing process due to the poor property of the domestic oil, and therefore the cleaning effect is usually poor.

Disclosure of Invention

The utility model aims to solve the technical problem that a two riser formula are floated top storage tank machinery cleaning system and device is provided, adopt new two riser formula machinery to wash, on the basis of guaranteeing safety, can improve the operating efficiency by a wide margin to can realize floating top storage tank safety, intelligence, high-efficient washing to large-scale.

The utility model provides a technical scheme that its technical problem adopted is: the double-vertical-pipe type floating roof storage tank mechanical cleaning system comprises a vacuum suction device, a cleaned storage tank, an oil receiving storage tank and an oil-water separator, wherein a suction pipeline, a first vertical pipe and a second vertical pipe are respectively arranged on the oil receiving storage tank, a tank roof cleaning machine injection system connected with the first vertical pipe and the second vertical pipe is arranged in the oil receiving storage tank, one end of the suction pipeline is connected with the vacuum suction device, and a transfer pipeline, a first cleaning pipeline and a second cleaning pipeline are arranged on the vacuum suction device in parallel;

one end of the first cleaning pipeline is connected with the first vertical pipe, one end of the second cleaning pipeline is connected with the second vertical pipe, a first communicating pipeline is arranged between one end of the first cleaning pipeline and one end of the second cleaning pipeline, a first switch valve is arranged on the first communicating pipeline, a second switch valve, a first cleaning pump, a third switch valve and a first one-way valve are sequentially arranged on the first cleaning pipeline from the vacuum suction device to the first vertical pipe direction, a fourth switch valve, a second cleaning pump, a fifth switch valve and a second one-way valve are sequentially arranged on the second cleaning pipeline from the vacuum suction device to the second vertical pipe direction, a second communicating pipeline is arranged between the first cleaning pipeline and the second cleaning pipeline, the joint of one end of the second communicating pipeline is positioned between the second switch valve and the first cleaning pump, the joint of the other end of the second communicating pipeline is positioned between the fourth switch valve and the second cleaning pump, a sixth switching valve is arranged on the second communicating pipe;

one end of the transfer pipeline is branched into three branch pipelines, one branch pipeline is connected with one end of the second cleaning pipeline, one branch pipeline is connected with the oil receiving storage tank, the other branch pipeline is connected with the oil-water separator, a seventh switch valve is arranged on each branch pipeline, an oil discharge pump, a third one-way valve and a fourth one-way valve are sequentially arranged on the transfer pipeline from the vacuum suction device to the three branch pipeline directions, a third communication pipeline is arranged between the second cleaning pipeline and the transfer pipeline, an eighth switch valve is arranged on the third communication pipeline, the joint of one end of the third communication pipeline is positioned between the third one-way valve and the fourth one-way valve, the joint of the other end of the third communication pipeline is positioned between the fourth switch valve and the second cleaning pump, a fourth communication pipeline is connected on the oil-water separator, and one end of the fourth communication pipeline is connected with the first cleaning pipeline, and the joint of one end of the fourth communicating pipeline is positioned between the second switch valve and the first cleaning pump, and the ninth switch valve is installed on the fourth communicating pipeline.

As right technical scheme a supplement, the suction line on be located all to be provided with a tenth ooff valve between oil extraction pump and the vacuum suction device and between oil extraction pump and the third check valve.

As a supplement to the technical solution of the present invention, two filters are arranged in parallel between the vacuum suction device and the suction pipeline.

As right technical scheme a supplement, vacuum suction device and suction pipeline between every parallel connection pipeline on all be provided with two eleventh ooff valves, two eleventh ooff valves are located the both sides that correspond the filter respectively.

As a supplement to the technical solution of the present invention, the suction pipeline is provided with a twelfth switch valve.

As right technical scheme a supplement, vacuum suction device include vacuum pump, vacuum tank and attached equipment, the vacuum pump links to each other with vacuum tank, takes out the gas in the vacuum tank through the effect of bleeding of vacuum pump, makes the interior production negative pressure of vacuum tank. As long as the inlet and outlet valves of the filter are opened, the oil in the cleaned storage tank can automatically enter the vacuum tank through the suction pipeline, so that the automatic suction function of the oil in the cleaned storage tank is realized.

As right technical scheme a supplement, still include inert gas replacement system, inert gas replacement system including installing at the monitoring devices who is washd in the storage tank and to wasing the injection device that the storage tank pours into inert gas into, monitoring devices real-time supervision is washd the oxygen concentration in the storage tank. Only after the oxygen concentration is less than 8% VOL in jar, just can open the cleaning machine and carry out mechanical cleaning, in jar oxygen concentration data and entire system take interlocking control, in case the oxygen concentration exceeds standard in jar, when sending the warning, the operation of system also can the automatic shutdown scavenging pump, has guaranteed the operation safety completely.

As right technical scheme a supplement, tank deck cleaning machine injection system include that the temporary erection is at the cleaning machine of being washd the storage tank deck, washs loop line and cleaning machine branch line, the washing loop line be linked together with first standpipe and second standpipe respectively, the washing loop line on evenly distributed have a plurality of cleaning machine branch lines, the cleaning machine is all installed to the end of every cleaning machine branch line.

As a supplement to the technical scheme of the utility model, the bore of washing loop line be greater than the bore of cleaning machine branch line.

As a supplement to the technical solution of the present invention, the first vertical pipe is provided with a thirteenth switch valve, and the second vertical pipe is provided with a fourteenth switch valve.

Has the advantages that: the utility model relates to a two riser formula floating roof storage tank machinery cleaning system and device has following several advantages:

1. through the double-vertical-pipe system, the process that a plurality of tank top cleaning machines can run simultaneously is realized by matching with different running states of the two cleaning pumps, and the cleaning efficiency is greatly improved;

2. in order to reduce the consumption of the on-site electricity consumption to the maximum extent, can also satisfy different operating mode requirements at the same time, the utility model discloses in lay two scavenging pumps and an oil extraction pump on a cleaning sled, the scavenging pump has the characteristics of high lift, low flow, the oil extraction pump has the characteristics of low lift, high flow, through the switching of pipeline and valve between three pumps, can realize the different functions of series connection, parallel connection, independent use, one operation one standby, etc. of three pumps, thereby can adopt different constructions to different on-site operating modes and different properties of the oil in the tank to be cleaned, can improve efficiency, can reduce energy consumption at the same time;

3. the tank top cleaning machine has the design characteristic of regional operation, and through a double-vertical-pipe system, a tank top cleaning loop line and corresponding valve switches, each vertical pipe can completely and independently supply cleaning media required by the cleaning machine in a region in charge of the vertical pipe, and the process of supplying the cleaning media required by the cleaning machine in injection can be met by only using one vertical pipe;

4. on the basis of ensuring safety, the operation efficiency can be greatly improved, so that the large floating roof storage tank can be safely, intelligently and efficiently cleaned.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is a schematic diagram of a dual standpipe cleaning system according to the present invention;

fig. 3 is a schematic structural diagram of the hot water circulation cleaning system according to the present invention;

FIG. 4 is a schematic structural view of an oil product transfer system according to the present invention;

FIG. 5 is a schematic diagram of the spray system of the tank top cleaning machine of the present invention;

fig. 6 is a schematic structural view of an oil suction system according to the present invention.

The figure is as follows: 1. an oil product pumping system, 2, an oil product transferring system, 3, a double-standpipe cleaning system, 4, a hot water circulation cleaning system, 5, a vacuum pumping device, 6, a filter, 7, a pumping pipeline, 8, a cleaned storage tank, 9, an oil discharge pump, 10, a transferring pipeline, 11, an oil product receiving storage tank, 12, a first cleaning pump, 13, a second cleaning pump, 14, an oil-water separator, 15, a first standpipe, 16, a second standpipe, 17, a cleaning loop line, 18, a cleaning machine branch line, 19, a cleaning machine, 20, a first cleaning pipeline, 21, a second cleaning pipeline, 22, a second switch valve, 23, a third switch valve, 24, a fourth switch valve, 25, a fifth switch valve, 26, a first one-way valve, 27, a first switch valve, 28, a second one-way valve, 29, a first communication pipeline, 30, a second communication pipeline, 31, a sixth switch valve, 32, a third communication pipeline, 33. an eighth switching valve, 34, a branch line, 35, a fourth communication line, 36, a ninth switching valve, 37, a third check valve, 38, a fourth check valve, 39, a tenth switching valve, 40, a seventh switching valve, 41, an eleventh switching valve, 42, a twelfth switching valve, 43, a thirteenth switching valve, 44, and a fourteenth switching valve.

Detailed Description

The present invention will be further described with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that various changes and modifications of the present invention may be made by those skilled in the art after reading the teachings of the present invention, and these equivalents also fall within the scope of the appended claims.

The embodiment of the utility model relates to a two riser formula floating roof storage tank machinery cleaning system and device, as shown in fig. 1, including vacuum suction device 5, by washing storage tank 8, oil receiving storage tank 11 and oil water separator 14, oil receiving storage tank 11 on be provided with suction line 7, first standpipe 15 and second standpipe 16 respectively, be arranged with the tank deck cleaning machine injection system who links to each other with first standpipe 15 and second standpipe 16 in this oil receiving storage tank 11, suction line 7 one end link to each other with vacuum suction device 5, vacuum suction device 5 on parallel arrangement transfer pipeline 10, first washing pipeline 20 and second washing pipeline 21;

one end of the first cleaning pipeline 20 is connected with the first vertical pipe 15, one end of the second cleaning pipeline 21 is connected with the second vertical pipe 16, a first communication pipeline 29 is arranged between one end of the first cleaning pipeline 20 and one end of the second cleaning pipeline 21, a first switch valve 27 is arranged on the first communication pipeline 29, a second switch valve 22, a first cleaning pump 12, a third switch valve 23 and a first one-way valve 26 are sequentially arranged on the first cleaning pipeline 20 from the vacuum suction device 5 to the first vertical pipe 15, a fourth switch valve 24, a second cleaning pump 13, a fifth switch valve 25 and a second one-way valve 28 are sequentially arranged on the second cleaning pipeline 21 from the vacuum suction device 5 to the second vertical pipe 16, a second communication pipeline 30 is arranged between the first cleaning pipeline 20 and the second cleaning pipeline 21, and the connection position of one end of the second communication pipeline 30 is positioned between the second switch valve 22 and the first cleaning pump 12, the connection position of the other end of the second communication pipeline 30 is positioned between the fourth switch valve 24 and the second cleaning pump 13, and a sixth switch valve 31 is arranged on the second communication pipeline 30;

one end of the transfer pipeline 10 is branched into three branch pipelines 34, one branch pipeline 34 is connected with one end of the second cleaning pipeline 21, one branch pipeline 34 is connected with the oil receiving storage tank 11, the other branch pipeline 34 is connected with the oil-water separator 14, a seventh switch valve 40 is installed on each branch pipeline 34, an oil discharge pump 9, a third one-way valve 37 and a fourth one-way valve 38 are sequentially arranged on the transfer pipeline 10 from the vacuum suction device 5 to the three branch pipelines 34, a third communication pipeline 32 is arranged between the second cleaning pipeline 21 and the transfer pipeline 10, an eighth switch valve 33 is installed on the third communication pipeline 32, the connection position of one end of the third communication pipeline 32 is positioned between the third one-way valve 37 and the fourth one-way valve 38, and the connection position of the other end of the third communication pipeline 32 is positioned between the fourth switch valve 24 and the second cleaning pump 13, the oil-water separator 14 is connected with a fourth communication pipeline 35, one end of the fourth communication pipeline 35 is connected with the first cleaning pipeline 20, the joint of one end of the fourth communication pipeline 35 is located between the second switch valve 22 and the first cleaning pump 12, and a ninth switch valve 36 is installed on the fourth communication pipeline 35.

A tenth switch valve 39 is disposed on the suction line 7 between the oil discharge pump 9 and the vacuum suction device 5 and between the oil discharge pump 9 and the third check valve 37.

The first vertical pipe 15 is provided with a thirteenth switch valve 43, and the second vertical pipe 16 is provided with a fourteenth switch valve 44.

The system comprises an oil product suction system 1, an oil product transfer system 2, a double-vertical-pipe cleaning system 3, a tank top cleaning machine injection system, a hot water circulation cleaning system 4 and an inert gas replacement system, wherein the systems are controlled in an interlocking manner, so that the construction safety and efficiency are ensured.

As shown in fig. 6, the oil product suction system 1 includes two filters 6, a set of vacuum suction device 5, a cleaned storage tank 8, and a suction pipeline 7 temporarily installed in a working site, the vacuum suction device 5 includes a vacuum pump, a vacuum tank and accessory equipment, the vacuum pump is connected to the vacuum tank, and the air in the vacuum tank is pumped out through the pumping action of the vacuum pump, so that negative pressure is generated in the vacuum tank, and as long as the inlet and outlet valves (i.e. four eleventh switch valves 41) of the filters 6 are opened, the oil product in the cleaned storage tank 8 can automatically enter the vacuum tank through the suction pipeline 7, thereby realizing the automatic suction function of the oil product in the cleaned storage tank 8. The suction line 7 is provided with a twelfth on-off valve 42, and the twelfth on-off valve 42 is normally in a constantly open state.

As shown in fig. 4, the oil product transferring system 2 includes a vacuum pumping device 5, an oil discharge pump 9, a third check valve 37, a fourth check valve 38, an oil product receiving storage tank 11, and a transferring pipeline 10 temporarily installed in a working site, and considering that when oil products are transferred, the oil products do not need to be lifted to a large height, but the oil product transferring speed needs to be ensured, in order to reduce electricity consumption in the construction site as much as possible, the oil discharge pump 9 adopts a centrifugal pump with a low lift and a high flow rate, and the oil product backflow phenomenon in the oil product receiving storage tank 11 can be avoided by installing the check valves on the transferring pipeline 10.

As shown in fig. 2, the dual standpipe cleaning system 3 includes a vacuum suction device 5, a first cleaning pump 12, a second cleaning pump 13, a first standpipe 15, a second standpipe 16, and temporarily installed serial-parallel switching valves at the job site.

Considering that each cleaning machine has a limit flow value when spraying, in order to reduce the power consumption of a construction site as much as possible, the two cleaning pumps adopt centrifugal pumps with high lift and low flow, but the flow is not less than the limit flow value when spraying by a single cleaning machine. According to being washed 8 jar interior oils of storage tank thick degree, through the pipeline switching function, two scavenging pumps can parallelly connected uses, can independent use simultaneously, also can realize one and use a reserve operation mode.

If the fluidity of oil in the tank 8 to be cleaned is good and the oil suction capacity is good, the second switch valve 22, the third switch valve 23, the fourth switch valve 24, the fifth switch valve 25, the thirteenth switch valve 43 and the fourteenth switch valve 44 can be opened, and the first switch valve 27 can be closed, at the moment, the first cleaning pump 12, the second cleaning pump 13, the first vertical pipe 15 and the second vertical pipe 16 are used in a one-to-one correspondence manner, so that the technological process that a plurality of cleaning machines on the top of the tank can run simultaneously is realized, and the cleaning efficiency is greatly improved. If the oil in the tank to be cleaned is thick, the oil pumping speed can not meet the requirement that two cleaning pumps run simultaneously, at the moment, only one cleaning pump can run, and the other cleaning pump can be used for standby. Therefore, different technological processes can be adopted according to the properties of oil products in the cleaned tank, and the site construction efficiency is greatly improved on the basis of greatly reducing the site power consumption.

As shown in fig. 5, the spray system of the tank top cleaning machine comprises a cleaning machine 19 temporarily installed on the tank top of the tank 8 to be cleaned, a cleaning loop 17 and cleaning machine branch lines 18, wherein the cleaning loop 17 is respectively communicated with a first vertical pipe 15 and a second vertical pipe 16, a plurality of cleaning machine branch lines 18 are uniformly distributed on the cleaning loop 17, and the cleaning machine 19 is installed at the tail end of each cleaning machine branch line 18. The cleaning machines 19 are mounted in the column sleeves of the floating roof, preferably evenly distributed. The diameter of the cleaning loop 17 and the cleaning branch 18 is varied to provide a pressurization function for the cleaning machine 19.

Referring to fig. 5, a cleaning loop 17 is respectively communicated with a first vertical pipe 15 and a second vertical pipe 16, a valve 13 and a valve 14 are respectively arranged on two sides of the cleaning loop 17 at the connecting end of the first vertical pipe 15, a valve 15 and a valve 16 are respectively arranged on two sides of the cleaning loop 17 at the connecting end of the second vertical pipe 16, and by means of the switch combination of the valve 13, the valve 14, the valve 15 and the valve 16, the cleaning medium required by the jetting of the cleaning machines in the areas in charge of each vertical pipe can be completely and independently supplied by each vertical pipe, the technical process that the cleaning medium required by the jetting of all the cleaning machines can be supplied by only one vertical pipe can be realized, when the valve 13 and the valve 16 are opened and the valve 14 and the valve 15 are closed, the cleaning medium supplied in the first vertical pipe 15 can meet the spraying requirements of the cleaning machines Q1-Q8, and the cleaning medium supplied in the second vertical pipe 16 can meet the spraying requirements of the cleaning machines Q9-Q15; if the valve 13, the valve 15, the valve 16 are opened, and the valve 14 is closed, the cleaning medium supplied in the first vertical pipe 15 can meet the spraying requirements of all cleaning machines; the cleaning medium supplied in the second standpipe 16 can meet the spraying requirements of all cleaning machines by opening the valve 13, the valve 14, the valve 15 and closing the valve 16. The different use processes of the two vertical pipes can be completely matched with the different operation processes of the two cleaning pumps.

As shown in fig. 3, the hot water circulation cleaning system 4 is composed of a vacuum pumping device 5, an oil discharge pump 9, a first cleaning pump 12, a second cleaning pump 13, an oil-water separator 14 and its related pipeline valves. The hot water cleaning is mainly to perform a final overall hot water flushing process on the inner surface of the cleaned storage tank 8 by using hot water in the later stage of the mechanical cleaning of the storage tank, and the second switch valve 22 and the fourth switch valve 24 are closed during the hot water cleaning. After the oily sewage in the tank 8 to be cleaned is automatically pumped to the vacuum pumping device 5 through the oil product pumping system 1, the oily sewage is firstly conveyed into the oil-water separator 14 through the oil discharge pump 9, and the separated water is pumped by the two cleaning pumps and then passes through the double-vertical-pipe cleaning system 3 and the tank top cleaning machine injection system, so that the technological process of automatic circulation cleaning of hot water in the tank can be realized.

Including inert gas replacement system, during the cleaning machine sprays, there is the production of static, in order to prevent the emergence of the conflagration explosion accident when the cleaning machine sprays, need to pour into inert gas into by the washing storage tank 8 to oxygen concentration in the real-time supervision jar. The inert gas replacement system comprises a monitoring device arranged in the cleaned storage tank 8 and an injection device for injecting inert gas into the cleaning storage tank 8, and the monitoring device monitors the oxygen concentration in the cleaned storage tank 8 in real time. Only after the oxygen concentration is less than 8% VOL in jar, just can open the cleaning machine and carry out mechanical cleaning, in jar oxygen concentration data and entire system take interlocking control, in case the oxygen concentration exceeds standard in jar, when sending the warning, the operation of system also can the automatic shutdown scavenging pump, has guaranteed the operation safety completely.

Claims (10)

1. The utility model provides a two riser formula floating roof storage tank machinery cleaning system and device which characterized in that: the oil product cleaning device comprises a vacuum suction device (5), a cleaned storage tank (8), an oil product receiving storage tank (11) and an oil-water separator (14), wherein a suction pipeline (7), a first vertical pipe (15) and a second vertical pipe (16) are respectively arranged on the oil product receiving storage tank (11), a tank top cleaning machine injection system connected with the first vertical pipe (15) and the second vertical pipe (16) is arranged in the oil product receiving storage tank (11), one end of the suction pipeline (7) is connected with the vacuum suction device (5), and a transfer pipeline (10), a first cleaning pipeline (20) and a second cleaning pipeline (21) are arranged on the vacuum suction device (5) in parallel;

one end of the first cleaning pipeline (20) is connected with the first vertical pipe (15), one end of the second cleaning pipeline (21) is connected with the second vertical pipe (16), a first communicating pipeline (29) is arranged between one end of the first cleaning pipeline (20) and one end of the second cleaning pipeline (21), a first switch valve (27) is arranged on the first communicating pipeline (29), a second switch valve (22), a first cleaning pump (12), a third switch valve (23) and a first one-way valve (26) are sequentially arranged on the first cleaning pipeline (20) from the vacuum suction device (5) to the first vertical pipe (15), a fourth switch valve (24), a second cleaning pump (13), a fifth switch valve (25) and a second one-way valve (28) are sequentially arranged on the second cleaning pipeline (21) from the vacuum suction device (5) to the second vertical pipe (16), a second communicating pipeline (30) is arranged between the first cleaning pipeline (20) and the second cleaning pipeline (21), the joint of one end of the second communicating pipeline (30) is positioned between the second switch valve (22) and the first cleaning pump (12), the joint of the other end of the second communicating pipeline (30) is positioned between the fourth switch valve (24) and the second cleaning pump (13), and a sixth switch valve (31) is arranged on the second communicating pipeline (30);

one end of the transfer pipeline (10) is branched into three branch pipelines (34), one branch pipeline (34) is connected with one end of the second cleaning pipeline (21), one branch pipeline (34) is connected with the oil receiving storage tank (11), the other branch pipeline (34) is connected with the oil-water separator (14), a seventh switch valve (40) is installed on each branch pipeline (34), an oil discharge pump (9), a third one-way valve (37) and a fourth one-way valve (38) are sequentially arranged on the transfer pipeline (10) from the vacuum suction device (5) to the three branch pipelines (34), a third communication pipeline (32) is arranged between the second cleaning pipeline (21) and the transfer pipeline (10), an eighth switch valve (33) is installed on the third communication pipeline (32), and the joint of one end of the third communication pipeline (32) is positioned between the third one-way valve (37) and the fourth one-way valve (38), the junction of the other end of the third communicating pipeline (32) is located between the fourth switch valve (24) and the second cleaning pump (13), the oil-water separator (14) is connected with a fourth communicating pipeline (35), one end of the fourth communicating pipeline (35) is connected with the first cleaning pipeline (20), the junction of one end of the fourth communicating pipeline (35) is located between the second switch valve (22) and the first cleaning pump (12), and the fourth communicating pipeline (35) is provided with a ninth switch valve (36).

2. The system and apparatus for cleaning a floating roof tank of a double riser type as claimed in claim 1, wherein: and tenth switch valves (39) are arranged on the suction pipeline (7) between the oil discharge pump (9) and the vacuum suction device (5) and between the oil discharge pump (9) and the third one-way valve (37).

3. The system and apparatus for cleaning a floating roof tank of a double riser type as claimed in claim 1, wherein: two filters (6) are arranged in parallel between the vacuum suction device (5) and the suction pipeline (7).

4. The system and apparatus for cleaning a floating roof tank of a double riser type as claimed in claim 3, wherein: and each parallel pipeline between the vacuum suction device (5) and the suction pipeline (7) is provided with two eleventh switch valves (41), and the two eleventh switch valves (41) are respectively positioned at two sides of the corresponding filter (6).

5. The system and apparatus for cleaning a floating roof tank of a double riser type as claimed in claim 1, wherein: a twelfth switch valve (42) is arranged on the suction pipeline (7).

6. The system and apparatus for cleaning a floating roof tank of a double riser type as claimed in claim 1, wherein: the vacuum suction device (5) comprises a vacuum pump, a vacuum tank and accessory equipment, wherein the vacuum pump is connected with the vacuum tank, and gas in the vacuum tank is pumped out through the pumping action of the vacuum pump, so that negative pressure is generated in the vacuum tank.

7. The system and apparatus for cleaning a floating roof tank of a double riser type as claimed in claim 1, wherein: the device further comprises an inert gas replacement system, the inert gas replacement system comprises a monitoring device installed in the cleaned storage tank (8) and an injection device for injecting inert gas into the cleaning storage tank (8), and the monitoring device monitors the oxygen concentration in the cleaned storage tank (8) in real time.

8. The system and apparatus for cleaning a floating roof tank of a double riser type as claimed in claim 1, wherein: the tank top cleaning machine spraying system comprises a cleaning machine (19), a cleaning loop line (17) and cleaning machine branch lines (18), wherein the cleaning machine (19), the cleaning loop line (17) and the cleaning machine branch lines (18) are temporarily installed on the tank top of a cleaned storage tank (8), the cleaning loop line (17) is respectively communicated with a first vertical pipe (15) and a second vertical pipe (16), the cleaning loop line (17) is uniformly distributed with a plurality of cleaning machine branch lines (18), and the cleaning machine (19) is installed at the tail end of each cleaning machine branch line (18).

9. The system and apparatus for cleaning a floating roof tank of a double riser type as claimed in claim 8, wherein: the caliber of the cleaning loop line (17) is larger than that of the cleaning machine branch line (18).

10. The system and apparatus for cleaning a floating roof tank of a double riser type as claimed in claim 1, wherein: and a thirteenth switch valve (43) is arranged on the first vertical pipe (15), and a fourteenth switch valve (44) is arranged on the second vertical pipe (16).

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