CN206466994U - A kind of low temperature heat seawater desalination system - Google Patents
A kind of low temperature heat seawater desalination system Download PDFInfo
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- CN206466994U CN206466994U CN201720074476.9U CN201720074476U CN206466994U CN 206466994 U CN206466994 U CN 206466994U CN 201720074476 U CN201720074476 U CN 201720074476U CN 206466994 U CN206466994 U CN 206466994U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
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Abstract
The utility model provides a kind of low temperature heat seawater desalination system, is especially adapted for use in the multiple-effect distillation seawater desalination system of Petrochemical Enterprises low temperature heat, including immersion steam generator 3 and MED systems.The utility model efficiently solves the long-standing low temperature exhaust heat of Petrochemical Enterprises and reclaims the problem of difficult and waste heat recovery level is low, energy-saving and emission-reduction are reached simultaneously, the purpose of desalinization cost is effectively reduced, and solve the problem of coastal Petrochemical Enterprises fresh water water is difficult.The setting of immersion steam generator is equivalent to the dividing wall type heat exchanger and flash chamber combined in traditional scheme in low temperature heat seawater desalination system described in the utility model, integrate the function of wall-type heat exchange and steam generation, it is highly suitable for Petrochemical Enterprises and reclaims the low temperature process water for being possible to be contaminated, both sea-water-desalination water producing pollution risk had been greatly reduced, it in turn simplify system, make operation manipulation simpler, take up an area and more save.
Description
Technical field
The utility model belongs to field of seawater desalination, more particularly, to one kind using Petrochemical Enterprises low temperature process hot water as thermal source
Low temperature heat seawater desalination system.
Background technology
Petrochemical Enterprises often have substantial amounts of low temperature exhaust heat, and (return water temperature requirement is 70 DEG C to mainly 95 DEG C of technique hot water
Left and right).At present, the heat utilization level of domestic refinery factory low temperature exhaust heat is very low, although pass through Introduced From Abroad low temperature exhaust heat in recent years
The technology of recycling, in terms of starting to be used to generating electricity by low temperature exhaust heat, tie up warm heating, utilizing waste heat for refrigeration, but effect is little, and still
So there are many low temperature exhaust heats directly to be discharged, both caused the repetition and waste of the energy, and thermal pollution is generated to environment.
Solving among the nervous all multi-methods of freshwater resources, desalinization is a kind of practical and effective method,
Especially for coastal cities and island.Being used but desalinization is energy-intensive industry, and at present desalinator more
Fossil fuel.The high energy consumption of desalinization causes water producing cost to remain high, on the other hand, and a large amount of fuel that burn are released into environment
Substantial amounts of greenhouse gases are released, also very big pressure are brought to environment.How further to reduce the water processed of sea water desalinating unit into
This has turned into international desalinization circle key issue to be solved.
Low-temperature multiple-effect distillation sea water desalting system (abbreviation MED systems, similarly hereinafter) is needed with steam in existing technology
As input thermal source, used when external heat source is hot water, it is necessary to which hot water first is transformed into steam and could supply MED systems.
On the premise of being not provided with additional heaters (electric heater, the gas/oil/coal heater of combustion etc.), hot water is utilized to produce the conventional of steam
Method is flash method, i.e., hot water is imported into a large space container, the container inner pressure is lower than heat hydraulic pressure, then hot water meeting
Flash, produce a part of steam, the temperature of steam is equal to the corresponding saturation temperature of container inner pressure, this some vapor conduct
The input thermal source of MED systems, i.e. " hot water flash evaporation+MED " technique.
(such as may be each containing process upstream flow in the technique hot water of refinery when there is volatile materials in thermal source hot water
The hydrocarbons that link is leaked out) when, the direct flash method of hot water of traditional method is no longer safe for MED systems, because
For chemical gas leak material may be contained in hot water, when hot water is directly flashed, the chemical industry in some drops, drop can be carried in steam secretly
Material can enter MED systems with steam, there is very maximum probability polluted seawater desalination production water；Directly utilize in low-temperature water heating, hot water
The oil product of leakage is too many, and directly flash distillation is it is also possible that the possibility of blast, leakage medium belt, seriously will hair come hidden danger of keeping the safety in production
Raw industrial accident；In addition, directly utilizing low-temperature water heating, it is also possible to which desalting plant is adversely affected, such as pipeline dirt is stifled
And increase cleaning frequency etc..
In this regard, there is design to consider once to exchange heat to chemical industry hot water using plate type heat exchanger, i.e., chemical industry hot water is made
The hot side runner of plate type heat exchanger is flowed through for hot working fluid, pure distilled water flows through the cold side stream of plate type heat exchanger as cold working medium
Road, the heat of such chemical industry hot water has just passed to distilled water, and this part distilled water is re-introduced into flash chamber to flash
Go out steam to use for MED systems, i.e. " plate type heat exchanger+flash vessel+MED " technique.The program utilizes plate type heat exchanger blockingization
Work hot water is directly contacted with MED systems, is served intermediate heat transfer effect, is greatly reduced the pollution wind of sea-water-desalination water producing
Danger.But, the program makes system become more complicated, adds the fussy degree of operation control, and extra increased board-like
Heat exchanger causes system footprint and investment also corresponding increase.
The content of the invention
In view of this, the utility model is directed to a kind of low temperature heat seawater desalination system, i.e. immersion steam
Generator and low-temperature multiple-effect distillation sea water desalting coupled system, to solve that existing system architecture is complicated, operation control is cumbersome,
And investment of occupation of land it is big the problems such as.
To reach above-mentioned purpose, what the technical solution of the utility model was realized in：
A kind of low temperature heat seawater desalination system, including immersion steam generator 3 and MED systems；
The immersion steam generator 3 is provided with hot working fluid entrance, hot working fluid outlet, water supplement port and steam (vapor) outlet；
The steam (vapor) outlet is connected by jet chimney 8 with the 1st tube side for imitating evaporator of MED systems；
The steam condensate of 1st effect evaporator of the MED systems is connected by condensing water conduit 9 with the water supplement port.
Further, the hot working fluid entrance of the immersion steam generator 3 and the technique hot water water pipe of refinery system
Road 10 is connected, and the hot working fluid outlet of the immersion steam generator 3 is connected with the technique hot water water return pipeline 11 of refinery system.
Further, the immersion steam generator 3 is the shell-and-tube heat exchanger of carrying vapour room.
Further, the shell-and-tube heat exchanger include housing, the heat-exchanging tube bundle that is arranged in housing and with the housing
Connected vaporium, the vaporium is provided with the steam (vapor) outlet, and the hot working fluid entrance, hot working fluid outlet are arranged on described
Heat-exchanging tube bundle two ends.
Further, the MED systems include sea water supply pipeline 14, condenser 2, low-temperature multi-effect evaporator group 1 and sea
Water discharge spout road 15；
The sea water supply pipeline 14 is connected with the condenser 2, the coolant outlet of condenser 2 respectively with it is described low
Warm multi-effect evaporator group 1, seawater discharge pipeline 15 are connected；
Along steam flow direction, in the low-temperature multi-effect evaporator group 1 before 1st effective evaporator steam (vapor) outlet and latter effect
The steam inlet of evaporator is connected, steam (vapor) outlet and the condenser 2 of the last evaporator of the low-temperature multi-effect evaporator group 1
Steam inlet be connected；
2nd effect evaporator is to last evaporator in the condensation-water drain and low-temperature multi-effect evaporator group 1 of the condenser 2
Steam condensation water out be respectively connected with product water recovery tube 13；
Strong brine connection strong brine discharge tube 12 in low-temperature multi-effect evaporator group 1.
Further, the strong brine discharge tube 12 is provided with strong brine emptying pump 5；
The product water recovery tube 13 is provided with product water pump 4；
The coolant outlet of the condenser 2 passes through material sea water booster pump 7 and the phase of low-temperature multi-effect evaporator group 1
Even.
Further, by material sea water booster pump 7 and spray equipment, uniformly spray is arrived the coolant outlet of condenser 2
In the low-temperature multi-effect evaporator group 1 outside the heat-exchanging tube bundle of each effect evaporator.
Further, the condensing water conduit 9 is provided with condensate pump 6.
A kind of method for desalting seawater, desalinization is carried out using MED systems, and immersion steam generator (3) produces steam
Thermal source is provided for MED systems.
Relative to prior art, low temperature heat seawater desalination system described in the utility model has the advantage that：
The setting of immersion steam generator is suitable in low temperature heat seawater desalination system described in the utility model
In combining dividing wall type heat exchanger and flash chamber in traditional scheme, integrate intermediate heat transfer and steam generating function, both greatly
Sea-water-desalination water producing pollution risk is reduced greatly, system is in turn simplify, makes operation manipulation simpler, takes up an area and more save；
It can realize online switching and on-bne repair by parallel many, meet the design requirement of petrochemical industry Refining Chemical Industry, i.e.,
Upstream is leaked, even if can also realize cut-out and handoff functionality, both without potential safety hazard, desalting plant is being nor affected on just
Often operation；
The present invention carries out the process route of low temperature multiple-effect distillation sea water desalting, not only using the low temperature exhaust heat of Petrochemical Enterprises
Energy-saving and emission-reduction can be reached, the purpose of desalinization cost is effectively reduced, and it is difficult to solve coastal Petrochemical Enterprises water
The problem of.
Brief description of the drawings
Constitute a part of accompanying drawing of the present utility model to be used for providing further understanding to of the present utility model, this practicality is new
The schematic description and description of type is used to explain the utility model, does not constitute to improper restriction of the present utility model.
In accompanying drawing：
Fig. 1 is the structural representation of low temperature heat seawater desalination system described in the utility model.
1- low-temperature multi-effect evaporator groups；2- condensers；3- immersion steam generators；4- water pumps；5- strong brine emptying pumps；
6- condensate pumps；7- material sea water booster pumps；8- jet chimneys；9- condensing water conduits；The technique hot water water of 10- refinery systems
Pipeline；The technique hot water water return pipeline of 11- refinery systems；12- strong brine discharge tubes；13- product water recovery tubes；14- seawater
Service；15- seawater discharge pipelines.
Embodiment
It should be noted that in the case where not conflicting, the feature in embodiment and embodiment in the utility model can
To be mutually combined.
In description of the present utility model, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " on ", " under ",
The orientation or position relationship of the instruction such as "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom ", " interior ", " outer " are
Based on orientation shown in the drawings or position relationship, it is for only for ease of description the utility model and simplifies description, rather than indicate
Or imply that the device or element of meaning must have specific orientation, with specific azimuth configuration and operation, therefore be not understood that
For to limitation of the present utility model.In addition, term " first ", " second " etc. are only used for describing purpose, and it is not intended that indicating
Or imply relative importance or the implicit quantity for indicating indicated technical characteristic.Thus, " first ", " second " etc. are defined
Feature can express or implicitly include one or more this feature.In description of the present utility model, unless separately
It is described, " multiple " are meant that two or more.
, it is necessary to which explanation, unless otherwise clearly defined and limited, term " are pacified in description of the present utility model
Dress ", " connected ", " connection " should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, or integratedly
Connection；Can be mechanical connection or electrical connection；Can be joined directly together, can also be indirectly connected to by intermediary,
It can be the connection of two element internals.For the ordinary skill in the art, on being understood by concrete condition
State concrete meaning of the term in the utility model.
Describe the utility model in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
The utility model provides a kind of low temperature heat seawater desalination system, as shown in figure 1, including immersion steam hair
Raw device 3 and MED systems；
Immersion steam generator 3 is provided with hot working fluid entrance, hot working fluid outlet, water supplement port and steam (vapor) outlet；
Steam (vapor) outlet is connected by jet chimney 8 with the 1st tube side for imitating evaporator of MED systems；
The steam condensate of 1st effect evaporator of MED systems is connected by condensing water conduit 9 with water supplement port.
The hot working fluid entrance of immersion steam generator 3 is connected with the technique hot water water pipeline 10 of refinery system, submergence
The hot working fluid outlet of formula steam generator 3 is connected with the technique hot water water return pipeline 11 of refinery system.
Immersion steam generator 3 is the shell-and-tube heat exchanger of carrying vapour room.
Shell-and-tube heat exchanger includes housing, the heat-exchanging tube bundle being arranged in housing and the vaporium being connected with housing, steam
Room is provided with steam (vapor) outlet, and hot working fluid entrance, hot working fluid outlet are arranged on heat-exchanging tube bundle two ends.
MED systems include sea water supply pipeline 14, condenser 2, low-temperature multi-effect evaporator group 1 and seawater discharge pipeline 15；
Sea water supply pipeline 14 is connected with condenser 2, the coolant outlet of condenser 2 respectively with low-temperature multi-effect evaporator group 1,
Seawater discharge pipeline 15 is connected；
Along steam flow direction, the steam (vapor) outlet of preceding 1st effective evaporator evaporates with latter effect in low-temperature multi-effect evaporator group 1
The steam inlet of device is connected, the steam (vapor) outlet of the last evaporator of low-temperature multi-effect evaporator group 1 and the steam inlet phase of condenser 2
Even；
In the condensation-water drain and low-temperature multi-effect evaporator group 1 of condenser 2 2nd effect evaporator to last evaporator steaming
Vapour condenses water out and is respectively connected with product water recovery tube 13；
Strong brine connection strong brine discharge tube 12 in low-temperature multi-effect evaporator group 1.
Strong brine discharge tube 12 is provided with strong brine emptying pump 5；
Product water recovery tube 13 is provided with product water pump 4；
The coolant outlet of condenser 2 is connected by material sea water booster pump 7 with low-temperature multi-effect evaporator group 1.
By material sea water booster pump 7 and spray equipment, uniformly spray evaporates the coolant outlet of condenser 2 to low-temperature multi-effect
In device group 1 outside the heat-exchanging tube bundle of each effect evaporator.
Condensing water conduit 9 is provided with condensate pump 6.
The course of work of this example：Refinery technique hot water enters immersion steam by refinery technique hot water water pipeline 10 and sent out
Raw device 3, refinery technique hot water is walked tube side, flowed through out of heat exchanger tube beam tube, then exports and flows out from hot working fluid, and by refinery technique
Hot water backwater's pipeline 11 is discharged.Pure distilled water is entered the shell side of immersion steam generator 3 as cold working medium by water supplement port,
In enclosure interior, heat-exchanging tube bundle is immersed in distilled water, and distilled water is by the refinery technique hot water heating inside heat-exchanging tube bundle and steams
Hair, steam is converged in vaporium.
Steam in the vaporium of immersion steam generator 3 enters MED systems the 1st by jet chimney 8 and imitates evaporator envelope
Head, it is internal subsequently into the 1st effect evaporator heat exchange tube bank, cooled down by the seawater outside tube bank, condense into distilled water, import the 1st
Evaporator freshwater room is imitated, is finally returned to by condensing water conduit 9 in the housing of immersion steam generator 3.
Seawater enters condenser 2 through sea water supply pipeline 14, is last evaporator production by the last 1st effective evaporator of MED systems
Raw steam condensation, own temperature rise a, part uniformly sprays MED systems through spray equipment as the material water of MED systems
Outside the heat-exchanging tube bundle of each effect evaporator of system, remaining seawater then flows back to sea by seawater discharge pipeline 15；In the 1st effect evaporation
In device, the steam that immersion steam generator 3 is produced enters the 1st effect evaporator heat exchange tube bank inside and condensed in tube bank,
The heat discharged causes spray to the seawater part evaporation in tube bank, and produced steam enters the 2nd effect evaporator, the
Being condensed in the tube bank of 2 effect evaporators, and discharge heat causes spray to the seawater part evaporation in tube bank, produced steam
Evaporator is imitated into the 3rd, by that analogy.The evaporating temperature of 1st effective evaporator is all the time than the evaporating temperature of preceding 1st effective evaporator afterwards
It is low.Material water all only some evaporations outside each effect heat exchange pipe of evaporator are sprayed, remaining part is (now referred to as dense
Salt solution) bottom of evaporator is then flowed under gravity.Produced steam is flowed into the tube bank of latter effect, and continues to occur
Condensation, condensing obtained distilled water turns into the product water of desalinization, and product water and strong brine are flowed into the mode of flowing automatically step by step
Next effect, to simplify structure and make full use of heat.Product water converges in condenser condensed water and exports and taken out by product water pump 4
Go out, fresh-water tank is delivered to through fresh water pipeline 13.Strong brine is in the last 1st effective evaporator strong brine floss hole of MED systems by strong brine pump
5 discharges, sea is flow back to through strong brine discharge tube 5.
Three kinds of " hot water flash evaporation+MED ", " plate type heat exchanger+flash vessel+MED " and " immersion steam generator+MED "
Technical scheme, process route is substantially similar in MED technological processes, and the main distinction is front end thermal source Land use systems.
(1) " hot water flash evaporation ", " immersion steam generator " and " plate type heat exchanger+flash vessel " three kinds of steam generation modes
Table 1 below is referred in technical contrast：
Table 1
(2) by taking unit 15000t/d MED devices as an example, " hot water flash evaporation+MED ", " immersion steam generator+MED " and
" plate type heat exchanger+flash vessel+MED " three kinds of process route energy consumption comparisons are shown in Table 2：
For " hot water flash evaporation ", " immersion steam generator " and " plate type heat exchanger+flash vessel " three kinds of process routes, leaching
Do not have the system energy consumption of the process route of formula steam generator relatively low.
For separate unit 15000t/d MED, " hot water flash evaporation " power consumption more daily than " immersion steam generator " will have more
7500kWh (according to 0.5 yuan/kWh of electricity price, i.e., 3750 yuan), then the operating cost of 1 year will have more about 1,370,000 yuan；
" plate type heat exchanger+flash vessel " power consumption more daily than " immersion steam generator " will have more 9750kWh (according to electricity
0.5 yuan/kWh of valency, i.e., 4875 yuan), then the operating cost of 1 year will have more about 1,780,000 yuan.
So, immersion steam generator+MED is most saved, and is also most suitable process route.
In addition, immersion steam generator+MED systems are compared with Conventional cryogenic multi-effect sea water desalting system, water producing cost
Substantially reduce：The UTILIZATION OF VESIDUAL HEAT IN low temperature multiple-effect distillation sea water desalting device makes water cost and can be divided into following several parts：Change
Learn chemical consumption, heating power consumption, power consumption, labor wage, welfare and administration fee, maintenance cost, equipment depreciation expense etc..
The depreciable life of engineering, desalting plant utilization rate of equipment and installations was calculated with 95% in terms of 25 years, and its each several part expense is as follows：
1) chemicals is consumed
Before raw water enters low temperature multiple-effect distillation device, antisludging agent, defoamer etc. must be added.In addition, to ensure device
Normal long journey, should periodically add biocide.The cleaning every year of low temperature multiple-effect distillation device once, the consumption of cleaning agent according to
Scaling degree is determined.Total about 0.3 yuan of the chemicals expense of fresh water per ton.
2) heating power is consumed
Low temperature multiple-effect distillation device is UTILIZATION OF VESIDUAL HEAT IN, therefore the consumption of the heating power of fresh water per ton is 0 yuan.
3) power consumption
The power consumption 1.2kWh of low temperature multiple-effect distillation desalting engineering water per ton, if electricity price is in terms of 0.50 yuan/kWh, low temperature
The ton hydroelectric power cost of multi-effect distilling desalination is 0.6 yuan.
4) salary appropriate to a special post welfare expenses
Sea water desalinating unit automaticity is very high, is not required to set special messenger's operation and maintenance.
5) depreciation of fixed assets expense
The depreciable life of fixed assets is 25 years, and salvage value of fixed assets is 4%, the depreciation of fixed assets expense of fresh water per ton
About 1.2 yuan.
6) overhauls and maintenance repair maintenance cost
The overhaul of the present apparatus and maintenance repair maintenance expense take the 1.5% of original value of fixed assets, the overhaul of desalination water per ton and
It is 0.48 yuan to overhaul maintenance cost.
So, it is as follows that UTILIZATION OF VESIDUAL HEAT IN low temperature multiple-effect distillation sea water desalting device makes water cost：
Unit makes water cost：2.58 yuan/ton, water producing cost is substantially reduced.
Preferred embodiment of the present utility model is the foregoing is only, it is all at this not to limit the utility model
Within the spirit and principle of utility model, any modification, equivalent substitution and improvements made etc. should be included in the utility model
Protection domain within.
Claims (8)
1. a kind of low temperature heat seawater desalination system, it is characterised in that：Including immersion steam generator (3) and MED systems
System；
The immersion steam generator (3) is provided with hot working fluid entrance, hot working fluid outlet, water supplement port and steam (vapor) outlet；
The steam (vapor) outlet is connected by jet chimney (8) with the 1st tube side for imitating evaporator of MED systems；
The steam condensate of 1st effect evaporator of the MED systems is connected by condensing water conduit (9) with the water supplement port.
2. low temperature heat seawater desalination system according to claim 1, it is characterised in that：The immersion steam hair
The hot working fluid entrance of raw device (3) is connected with the technique hot water water pipeline (10) of refinery system, the immersion steam generator
(3) hot working fluid outlet is connected with the technique hot water water return pipeline (11) of refinery system.
3. low temperature heat seawater desalination system according to claim 1, it is characterised in that：The immersion steam hair
Raw device (3) is the shell-and-tube heat exchanger of carrying vapour room.
4. low temperature heat seawater desalination system according to claim 3, it is characterised in that：The shell-and-tube heat exchanger
Including housing, the heat-exchanging tube bundle being arranged in housing and the vaporium being connected with the housing, the vaporium is provided with described
Steam (vapor) outlet, the hot working fluid entrance, hot working fluid outlet are arranged on the heat-exchanging tube bundle two ends.
5. the low temperature heat seawater desalination system according to claim any one of 1-4, it is characterised in that：The MED
System includes sea water supply pipeline (14), condenser (2), low-temperature multi-effect evaporator group (1) and seawater discharge pipeline (15)；
The sea water supply pipeline (14) is connected with the condenser (2), condenser (2) coolant outlet respectively with it is described
Low-temperature multi-effect evaporator group (1), seawater discharge pipeline (15) are connected；
Along steam flow direction, the steam (vapor) outlet of preceding 1st effective evaporator steams with latter effect in the low-temperature multi-effect evaporator group (1)
The steam inlet for sending out device is connected, steam (vapor) outlet and the condenser of the last evaporator of the low-temperature multi-effect evaporator group (1)
(2) steam inlet is connected；
2nd effect evaporator is to last evaporator in the condensation-water drain and low-temperature multi-effect evaporator group (1) of the condenser (2)
Steam condensation water out be respectively connected with product water recovery tube (13)；
Strong brine connection strong brine discharge tube (12) in low-temperature multi-effect evaporator group (1).
6. low temperature heat seawater desalination system according to claim 5, it is characterised in that：
The strong brine discharge tube (12) is provided with strong brine emptying pump (5)；
The product water recovery tube (13) is provided with product water pump (4)；
The coolant outlet of the condenser (2) passes through material sea water booster pump (7) and low-temperature multi-effect evaporator group (1) phase
Even.
7. low temperature heat seawater desalination system according to claim 5, it is characterised in that：The condenser (2) is cold
But by material sea water booster pump (7) and spray equipment, uniformly spray arrives each in the low-temperature multi-effect evaporator group (1) to water out
Outside the heat-exchanging tube bundle for imitating evaporator.
8. the low temperature heat seawater desalination system described in claim any one of 1-4 or 6-7 is characterized in that：It is described to condense
Waterpipe (9) is provided with condensate pump (6).
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| CN201720074476.9U CN206466994U (en) | 2017-01-19 | 2017-01-19 | A kind of low temperature heat seawater desalination system |
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| CN201720074476.9U CN206466994U (en) | 2017-01-19 | 2017-01-19 | A kind of low temperature heat seawater desalination system |
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Effective date of registration: 20211223 Address after: 643000 whole building, No. 150, Huangjueping Road, Wuxing Street, Ziliujing District, Zigong City, Sichuan Province Patentee after: DONGFANG BOILER GROUP Co.,Ltd. Address before: 300462 No. 1, Lingang Economic Zone, Binhai New Area, Tianjin Patentee before: ZHONGHE SEAWATER DESALINATION ENGINEERING Co.,Ltd. |