CN208373768U - A kind of cleaning system of mercurous oil sump - Google Patents
A kind of cleaning system of mercurous oil sump Download PDFInfo
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- CN208373768U CN208373768U CN201820440330.6U CN201820440330U CN208373768U CN 208373768 U CN208373768 U CN 208373768U CN 201820440330 U CN201820440330 U CN 201820440330U CN 208373768 U CN208373768 U CN 208373768U
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- oil sump
- sealing
- mercurous
- cleaning
- mercurous oil
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Abstract
The utility model discloses a kind of cleaning systems of mercurous oil sump.It includes the equipment such as sealing device, pneumatic unmanned machine for cleaning, nitrogen making machine, scrubbing tower, clean and reuse sled and three-phase centrifuge.The system is safely and effectively to clean to the contaminated-oil basin of high mercury content first, then, controls in the process of cleaning and reduces harmful mercury emissions, finally, three phase separation is carried out to the greasy filth of the flowability in oil sump after cleaning, finally obtains oil, water and body refuse.The cleaning method and system of the mercurous oil sump of the utility model, structure is simple, method is easy, and mercury removal efficiency is high, also, can effectively guarantee to avoid the injury of pollution and human body to environment.
Description
Technical field
The utility model relates to petrochemical industry, in particular to a kind of the cleaning method and system of mercurous oil sump.
Background technique
Mercury, i.e. mercury are that have the liquid metal seriously poisoned to human body and environment.In chemical field, it is often necessary to
Oil product is handled using mercury or its relevant compound.In this way, often there is a certain amount of mercury in oil product, it is long and long
It, the content of mercury will constantly rise in oil sump, and then influence oil quality, and pollute environment, poison human body.
Therefore, the cleaning of mercurous oil sump how is carried out to avoid the injury of pollution and human body to environment, and becoming is one
Problem to be solved.
Utility model content
In view of this, the present invention provides the cleaning methods and system of a kind of mercurous oil sump, to be carried out to mercurous oil sump,
The pollution to environment and the injury of human body are avoided simultaneously.
The technical solution of the utility model is achieved in that
A kind of cleaning method of mercurous oil sump, comprising:
Mercurous oil sump is sealed；
Unmanned cleaning is carried out to the mercurous oil sump after sealing, and injects liquor ferri trichloridi, with mercurous oil after sealing
Circulation stirring is carried out in pond；
While carrying out unmanned cleaning to the mercurous oil sump of sealing, nitrogen is passed through into the mercurous oil sump of sealing；
In the unmanned cleaning process, the gas being discharged from the mercurous oil sump of the sealing is cleaned, with removal
Mercury vapour contained in gas.
Further, the mercurous oil sump is sealed using steel plate and thick polystyrene or polyethylene film.
Further, unmanned cleaning is carried out using mercurous oil sump of the pneumatic vertical unmanned machine for cleaning to the sealing.
Further, the nitrogen is manufactured by nitrogen making machine, wherein nitrogen gas concn is at least 98%, and nitrogen power processed is 90KW, system
Nitrogen quantity is 350m3/ h, gas pressure are less than or equal to 3ba.
Further, in scrubbing tower, using ferric trichloride cleaning solution to the gas of the mercurous oil sump of sealing discharge into
Row cleaning.
Further, the method also includes:
It, will be in the mercurous oil sump of the sealing after nitrogen gas concn in the mercurous oil sump of the sealing is lower than setting concentration
Flowable Residual oil is extracted out and is sprayed back in the mercurous oil sump of the sealing.
Further, the method also includes:
It, will be in the mercurous oil sump of the sealing after greasy filth in the mercurous oil sump of the sealing, which reaches mobility, to be required
Mixture extraction, is added chemical agent, and be sufficiently stirred；
Mixture after being sufficiently stirred carries out three phase separation.
A kind of cleaning system of mercurous oil sump, comprising:
Sealing device, the sealing device seal the mercurous oil sump；
Pneumatic unmanned machine for cleaning, the pneumatic unmanned machine for cleaning is set up in the mercurous oil sump, to mercurous after sealing
Oil sump carries out unmanned cleaning, and injects liquor ferri trichloridi, to carry out circulation stirring in mercurous oil sump after sealing；
Nitrogen making machine, the nitrogen making machine is connected to the mercurous oil sump after sealing, to carry out nobody to the mercurous oil sump of sealing
While cleaning, nitrogen is passed through into the mercurous oil sump of sealing；And
Scrubbing tower, the scrubbing tower is connected to the mercurous oil sump after sealing, will be from institute in the unmanned cleaning process
The gas for stating the mercurous oil sump discharge of sealing is cleaned, to remove mercury vapour contained in gas.
Further, the sealing device is steel plate and thick polystyrene or polyethylene film.
Further, in the scrubbing tower, using ferric trichloride cleaning solution to the gas of the mercurous oil sump discharge of the sealing
It is cleaned.
Further, in the scrubbing tower, it is also filled with the active carbon removed odors.
It is cleaned using gas of the ferric trichloride cleaning solution to the mercurous oil sump discharge of the sealing.
Further, the cleaning system further includes clean and reuse sled and spray gun: wherein
The spray gun is installed on the top of the mercurous oil sump after sealing；
The clean and reuse sled is connected to the mercurous oil sump of sealing by oil pick-up tube and is connected to the spray gun, described
After nitrogen gas concn in the mercurous oil sump of sealing is lower than setting concentration, Residual oil flowable in the mercurous oil sump of the sealing is taken out
It is returned in the mercurous oil sump of sealing out and by the lance ejection.
Further, the cleaning system further includes pretreatment sled and three-phase centrifuge；Wherein,
The pretreatment sled is connected to the clean and reuse sled, when the greasy filth in the mercurous oil sump of the sealing reaches flowing
Property require after, the mixture in the mercurous oil sump of the sealing is extracted out and is pumped to the pretreatment by clean and reuse sled
Sled, and chemical agent is added in pretreatment sled, and be sufficiently stirred；
Three-phase centrifuge, the three-phase centrifuge are connected to the pretreatment sled, and the mixture after stirring carries out three
Mutually separate.
From above scheme as can be seen that the cleaning method and system of the mercurous oil sump of the utility model, are to have safely first
Cleaning to the contaminated-oil basin of high mercury content for effect, then, controls in the process of cleaning and reduces harmful mercury emissions, finally,
Three phase separation is carried out to the greasy filth of the flowability in oil sump after cleaning, finally obtains oil, water and body refuse.The utility model
Mercurous oil sump cleaning method and system, structure is simple, method is easy, and mercury removal efficiency is high, also, can effectively guarantee
Avoid the pollution to environment and the injury of human body.
Detailed description of the invention
Fig. 1 is the cleaning method flow chart of the mercurous oil sump of the utility model embodiment；
Fig. 2 is the cleaning system schematic diagram of the mercurous oil sump of the utility model embodiment.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, develop simultaneously reality referring to the drawings
Example is applied, the utility model is described in further detail.
As shown in Figure 1, the cleaning method of mercurous oil sump provided by the embodiment of the utility model, mainly comprises the steps that
Mercurous oil sump is sealed by step 1；
Step 2 carries out unmanned cleaning to the mercurous oil sump after sealing, and injects liquor ferri trichloridi, with after sealing
Circulation stirring is carried out in mercurous oil sump；
Step 3, while carrying out unmanned cleaning to the mercurous oil sump of sealing, be passed through nitrogen into the mercurous oil sump of sealing
Gas；
Step 4, in the unmanned cleaning process, the gas being discharged from the mercurous oil sump of the sealing is cleaned,
To remove mercury vapour contained in gas.
In the utility model embodiment, in step 1, to the sealing of mercurous oil sump using steel plate and thick polystyrene or
Polyethylene film.Specifically the exposed position of mercurous oil sump is subjected to whole sealings with sheet metal, meanwhile, outside mercurous oil sump
Face with thick polypropylene or polyethylene film sealing, can guarantee the overall tightness of mercurous oil sump again in this way, prevent from carrying out clearly
When washing, containing overflowing in mercury gas outwardly environment, the pollution to environment is prevented.
In step 2, unmanned cleaning is carried out using mercurous oil sump of the pneumatic vertical unmanned machine for cleaning to the sealing.It is preferred that
Ground, in a specific embodiment of the utility model, according to the shapes and sizes of mercurous oil sump, it is assumed that a certain number of pneumatic vertical
Formula unmanned machine for cleaning can accelerate the cleaning process of greasy filth in mercurous oil sump, with raising efficiency.For example, in general, mercurous oil
The shape majority in pond is rectangular shape, and its size general satisfaction sets up two pneumatic vertical unmanned machine for cleaning and carries out nobody
Cleaning, prevents manually to clean, and contacts to avoid artificial with the direct of mercurous oil sump, prevents personnel's mercury poisoning.
Meanwhile liquor ferri trichloridi is also injected by pneumatic vertical unmanned machine for cleaning in this step 2, with containing after sealing
Circulation stirring is carried out in mercury oil sump, so that ferric trichloride is sufficiently reacted with the mercury in oil, reactive chemistry formula are as follows:
2FeCl3+ 2Hg=2FeCl2+Hg2Cl2
Wherein, FeCl3For ferric trichloride, Hg is mercury, FeCl2For ferrous chloride, Hg2Cl2For calogreen (calomel).For
Guarantee the abundant reaction of mercury, injection is excessive liquor ferri trichloridi.
In step 3, the nitrogen being filled with can using other inert gases replace, still, it is contemplated that manufacturing cost etc. because
Element, optimal gas are nitrogen.In the utility model embodiment, the nitrogen can be manufactured directly by nitrogen making machine.As one
Specific embodiment, nitrogen gas concn are at least 98%, and nitrogen power processed is 90KW (kilowatt), and nitrogen quantity processed is 350m3/ h (cubic meter/small
When), gas pressure is less than or equal to 3ba (bar).In the utility model embodiment, oxygen concentration≤8% is controlled.
In the utility model embodiment, the gas that equivalent is had after injection nitrogen is excluded, and in step 4, is arranged mercurous oil sump
Gas out, which carries out cleaning, to be carried out in scrubbing tower.As a specific embodiment, ferric trichloride is used in scrubbing tower
Cleaning solution cleans the gas of the mercurous oil sump discharge of the sealing.In addition, active carbon can be added in scrubbing tower, to go
It eliminates the unusual smell.
For the thorough cleaning for the gas that the mercurous oil sump guaranteed to the sealing is discharged, mercury vapour is avoided to enter atmosphere dirt
Contaminate environment.It needs using the liquor ferri trichloridi and sodium sulfide solution of excess component as removal of mercury cleaning agent, in order to react mercury
Completely, it is necessary to assure FeCl3(ferric trichloride) is excessive, passes through reaction
2FeCl3+ 2Hg=2FeCl2+Hg2Cl2
Virose mercury is reacted and generates Hg2Cl2(calomel), calomel are non-toxic.
In order to increase mixing effect, the Residual oil in mercurous oil sump is futher stirred, and then the mercury energy in Residual oil
It is enough to be further precipitated.In the utility model embodiment, in cleaning cleaning process in step 4, when the mercurous oil of the sealing
Inert gas (such as nitrogen) concentration in pond, will be flowable residual in the mercurous oil sump of the sealing lower than after presetting concentration
Oil is extracted out and is sprayed back in the mercurous oil sump of the sealing, can increase the mobility of Residual oil in this way, so that the stirring of Residual oil is more
Sufficiently.As a specific embodiment, this presets concentration such as 5%~10%, further, it is preferred to preset concentration
It is 8%.
In the utility model embodiment, also while oil-sludge treatment process is provided, to remove the silt in mercurous oil sump.?
On the basis of above method embodiment, further comprise:
It, will be in the mercurous oil sump of the sealing after greasy filth in the mercurous oil sump of the sealing, which reaches mobility, to be required
Mixture extraction, is added chemical agent, and be sufficiently stirred；
Mixture after being sufficiently stirred carries out three phase separation.
Wherein, the chemical agent being added is demulsifier, as a specific embodiment, the chemical agent such as tri-chlorination
Iron and vulcanized sodium.
The utility model embodiment, while a kind of cleaning system of mercurous oil sump is additionally provided, as shown in Fig. 2, the cleaning
System mainly includes sealing device 11, pneumatic unmanned machine for cleaning 12, nitrogen making machine 13 and scrubbing tower 14.Wherein, the sealing device
11, it is covered on the opening of mercurous oil sump 2, mercurous oil sump 2 is sealed.The pneumatic unmanned machine for cleaning 12 is set up in described mercurous
Oil sump 2 to carry out unmanned cleaning to the mercurous oil sump 2 after sealing, and injects liquor ferri trichloridi, with mercurous oil after sealing
Circulation stirring is carried out in pond 2.The nitrogen making machine 13 is connected to the mercurous oil sump 2 after sealing, with to the mercurous oil sump 2 of sealing into
While nobody cleaning of row, nitrogen is passed through into the mercurous oil sump 2 of sealing.The scrubbing tower 14 is connected to the mercurous oil after sealing
Pond 2, the gas being discharged from the mercurous oil sump 2 of the sealing to be cleaned, to go degasification in the unmanned cleaning process
Mercury vapour contained in body.
Further, in the utility model embodiment, the sealing device 1 is steel plate and thick polystyrene or polyethylene
Film.
In the utility model embodiment, in the scrubbing tower 14, the sealing is contained using ferric trichloride cleaning solution
The gas of mercury oil sump discharge is cleaned, and the exhaust gas of mercurous oil sump discharge has mercuryvapour and petroleum-type organic gas；Mercuryvapour with
Ferric chloride reaction generates calomel and goes the toxicity of the removal of mercury.Meanwhile in the scrubbing tower 14, it is also filled with absorption petroleum-type
The active carbon of organic gas.
With continued reference to shown in Fig. 2, the cleaning system of the mercurous oil sump of the utility model further includes clean and reuse sled 15 and spray
Rifle (not shown).Wherein, the spray gun is installed on the top of the mercurous oil sump 2 after sealing, for example, the spray gun is mountable
In sealing steel plate towards the one side of mercurous oil sump 2.
Clean and reuse sled 15 is connected to the mercurous oil sump 2 of sealing by oil pick-up tube and is connected to the spray gun, with
It, will be flowable in the mercurous oil sump of the sealing after nitrogen gas concn in the mercurous oil sump 2 of the sealing is lower than setting concentration
Residual oil is extracted out and is returned in the mercurous oil sump 2 of sealing by the lance ejection.The clean and reuse sled 15 extracts flowable residual
Oil is realized by the vacuum pump set in it.As a specific embodiment, preset concentration such as 5%~10%, into one
Step ground, preset concentration is preferably 8%.
With further reference to shown in Fig. 2, the pumping of Residual oil is extracted between clean and reuse sled 15 and the mercurous oil sump 2 of sealing
Filter 16 is also connected at oil pipe, the effect of filter 16 is the impurity for filtering out larger particles in Residual oil, prevents bulk miscellaneous
Matter blocking pipeline and/or the vacuum pump machine core for destroying clean and reuse sled 15.
Further, in the utility model embodiment, the cleaning system of the mercurous oil sump further includes pretreatment 17 Hes of sled
Three-phase centrifuge 18.Wherein, the pretreatment sled 17 is connected to the clean and reuse sled 15, when the mercurous oil sump 2 of the sealing
In greasy filth reach after mobility requires, clean and reuse sled 15 extracts the mixture in the mercurous oil sump 2 of the sealing out
And it is pumped to the pretreatment sled 17, and chemical agent is added in pretreatment sled, and be sufficiently stirred, wherein be added
Chemical agent be demulsifier, as a specific embodiment, the chemical agent such as ferric trichloride and vulcanized sodium.The three-phase
Centrifuge 18 is connected to the pretreatment sled 17, carries out three phase separation for the mixture after stirring, to obtain oil, water and mud
Sand, and then be disposed respectively.
The utility model embodiment, the detailed process method and points for attention in a specific operation are as follows.
First mercurous oil sump is sealed, sets up the unmanned cleaning device of two Pneumatic cleaning machines, clean and reuse sled is installed on
Beside greasy filth, greasy filth sewage mixed liquor is arrived to centrifugal pump by filter by cleaning machine using the vacuum system of clean and reuse sled again
Circulation allows ferric trichloride sufficiently and in greasy filth by the liquor ferri trichloridi of configuration by cleaning equipment circulation stirring in oil sump
It is chemically reacted with the mercury in waste water
2FeCl3+ 2Hg=2FeCl2+Hg2Cl2
Mercury content to be minimized.
For the cleaning of pond inner sealing to guarantee to carry out in non-quick-fried environment, into pond, confined space injects nitrogen, and then controls oxygen
Gas concentration is not more than 8%, since injection nitrogen has the gas evolution of equivalent, a scrubbing tower is installed in scheme, discharge
Gas again passes by liquor ferri trichloridi and is washed, to remove the mercury in mercuryvapour.
Wait dispose, the greasy filth in mercurous oil sump has certain mobility, and the mercury in liquid and gaseous state is sampled
Detection is qualified, the greasy filth in pond can be pumped to pretreatment sled by recovery system and pre-processed, and in pretreatment sled
Chemical agent is added, after being sufficiently stirred and reacting, mixture is pumped to three-phase centrifuge, while flocculation machine is added, so that mixed
It closes object separation and obtains oil, water and body refuse.
Whole process can not only remove the greasy filth in mercurous oil sump, and can recycle the oil after separation, reduce greasy filth
Direct Disposal amount, allow the effective resource utilization of greasy filth.
It is specific as follows:
(1) it is closed to clean mercurous greasy filth cesspool
It to guarantee environment and personal safety, is carried out using closed cleaning way, pond exposed position sheet metal whole
Sealing, pond outside is again with thick polypropylene or polyethylene film sealing.
(2) two pneumatic unmanned machine for cleaning are installed
It is cuboid according to mercurous greasy filth cesspool, plan sets up two pneumatic vertical type cleaning machines and carries out unmanned cleaning, Du
Cleaning artificial absolutely.
(3) inert nitrogen gas is injected
Fluid jet can generate electrostatic when due to cleaning machine work, so being determined in scheme to injection among closed pond
Inert nitrogen gas guarantees cleaning machine operation in non-quick-fried environment to dilute oxygen concentration inside pond.Nitrogen processed is used in scheme
Mechanism nitrogen, nitrogen gas concn are not less than 98%, and power 90KW, nitrogen quantity processed is 350m3/h, and gas pressure is not more than 3ba.
(4) in pond emergent gas disposition
Consider pond internal gas pressure balance, inject a certain amount of nitrogen, necessarily has the discharge of mixed in equal amounts gas, be anti-
The gas being only discharged contains mercury pollution environment, and scheme, which determines, installs a scrubbing tower additional, and the mercuryvapour trichlorine in gas will be discharged
Change iron cleaning solution to react away, and active carbon is added in scrubbing tower, to remove odors.
(5) chemical reaction of ferric trichloride cleaning agent and mercury:
It is easy to be used as removal of mercury cleaning agent using the liquor ferri trichloridi and vulcanized sodium of excess component, in order to react mercury
Entirely, it is necessary to assure FeCl3It is excessive.
(6) cleaning process
After the nitrogen gas concn in oil sump is lower than 8%, the vacuum pump in clean and reuse sled is opened, Jiang Chizhong is flowable
Residual oil pumps in vacuum tank, opens centrifugal pump later, by the liquid pumping in vacuum tank to the spray gun being mounted at the top of oil sump.
Spray gun can also be stirred greasy filth in pond while spraying liquid.
(7) greasy filth pre-processes
After the greasy filth in oil sump has good mobility, mixture in oil sump will be held using clean and reuse sled and will be pumped
It is prized to pretreatment.Chemical agent is added in pretreatment sled, and is sufficiently stirred.
(8) three phase separation
By the feed pump in three-phase centrifuge, by the material pumping in pretreatment sled to three-phase centrifuge, and wadding is added
Solidifying agent makes oil, water, solid three phase separation.The oil isolated can give back owner；It is discharged as required after water is detectable；Gu
Body judges whether to be danger wastes, if not danger wastes, can directly backfill, if it is dangerous waste after detecting
Object need to then be disposed by professional enterprise.
From above description, it can be seen that the cleaning method and system of the mercurous oil sump of the utility model, are to have safely first
Cleaning to the contaminated-oil basin of high mercury content for effect, then, controls in the process of cleaning and reduces harmful mercury emissions, finally,
Three phase separation is carried out to the greasy filth of the flowability in oil sump after cleaning, finally obtains oil, water and body refuse.The utility model
Mercurous oil sump cleaning method and system, structure is simple, method is easy, and mercury removal efficiency is high, also, can effectively guarantee
Avoid the pollution to environment and the injury of human body.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
Within the spirit and principle of utility model, any modification, equivalent substitution, improvement and etc. done should be included in the utility model
Within the scope of protection.
Claims (6)
1. a kind of cleaning system of mercurous oil sump, which is characterized in that the cleaning system includes:
Sealing device, the sealing device seal the mercurous oil sump；
Pneumatic unmanned machine for cleaning, the pneumatic unmanned machine for cleaning are set up in the mercurous oil sump, to the mercurous oil sump after sealing
Unmanned cleaning is carried out, and injects liquor ferri trichloridi, to carry out circulation stirring in mercurous oil sump after sealing；
Nitrogen making machine, the nitrogen making machine are connected to the mercurous oil sump after sealing, to carry out unmanned cleaning to the mercurous oil sump of sealing
While, nitrogen is passed through into the mercurous oil sump of sealing；And
Scrubbing tower, the scrubbing tower is connected to the mercurous oil sump after sealing, will be from described close in the unmanned cleaning process
The gas of the mercurous oil sump discharge of envelope is cleaned, to remove mercury vapour contained in gas.
2. the cleaning system of mercurous oil sump according to claim 1, it is characterised in that:
The sealing device is steel plate and thick polystyrene or polyethylene film.
3. the cleaning system of mercurous oil sump according to claim 1, it is characterised in that:
In the scrubbing tower, cleaned using gas of the ferric trichloride cleaning solution to the mercurous oil sump discharge of the sealing.
4. the cleaning system of mercurous oil sump according to claim 1, it is characterised in that:
In the scrubbing tower, it is also filled with the active carbon removed odors；
It is cleaned using gas of the ferric trichloride cleaning solution to the mercurous oil sump discharge of the sealing.
5. the cleaning system of mercurous oil sump according to any one of claims 1 to 4, it is characterised in that:
The cleaning system further includes clean and reuse sled and spray gun: wherein
The spray gun is installed on the top of the mercurous oil sump after sealing；
The clean and reuse sled is connected to the mercurous oil sump of sealing by oil pick-up tube and is connected to the spray gun, in the sealing
Mercurous oil sump in nitrogen gas concn lower than setting concentration after, by Residual oil flowable in the mercurous oil sump of the sealing extraction simultaneously
It is returned by the lance ejection in the mercurous oil sump of sealing.
6. the cleaning system of mercurous oil sump according to claim 5, it is characterised in that:
The cleaning system further includes pretreatment sled and three-phase centrifuge；Wherein,
The pretreatment sled is connected to the clean and reuse sled, wants when the greasy filth in the mercurous oil sump of the sealing reaches mobility
After asking, the mixture in the mercurous oil sump of the sealing is extracted and is pumped to out the pretreatment sled by the clean and reuse sled, and
Chemical agent is added in pretreatment sled, and is sufficiently stirred；
Three-phase centrifuge, the three-phase centrifuge are connected to the pretreatment sled, and the mixture after stirring carries out three-phase separate
From.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820440330.6U CN208373768U (en) | 2018-03-30 | 2018-03-30 | A kind of cleaning system of mercurous oil sump |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820440330.6U CN208373768U (en) | 2018-03-30 | 2018-03-30 | A kind of cleaning system of mercurous oil sump |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108435726A (en) * | 2018-03-30 | 2018-08-24 | 北京生态岛科技有限责任公司 | A kind of cleaning method and system of mercurous oil sump |
| CN110644512A (en) * | 2019-10-15 | 2020-01-03 | 安爱军 | Combined type inflatable environment-friendly cofferdam and on-site automatic cleaning and storing equipment |
| CN112570348A (en) * | 2020-11-25 | 2021-03-30 | 中国舰船研究设计中心 | Desilting device and desilting method for stern shaft tube sealing device |
-
2018
- 2018-03-30 CN CN201820440330.6U patent/CN208373768U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108435726A (en) * | 2018-03-30 | 2018-08-24 | 北京生态岛科技有限责任公司 | A kind of cleaning method and system of mercurous oil sump |
| CN110644512A (en) * | 2019-10-15 | 2020-01-03 | 安爱军 | Combined type inflatable environment-friendly cofferdam and on-site automatic cleaning and storing equipment |
| CN112570348A (en) * | 2020-11-25 | 2021-03-30 | 中国舰船研究设计中心 | Desilting device and desilting method for stern shaft tube sealing device |
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