CN213956063U - Heat exchange system for aluminum oxide smelting - Google Patents
Heat exchange system for aluminum oxide smelting Download PDFInfo
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- CN213956063U CN213956063U CN202022589871.5U CN202022589871U CN213956063U CN 213956063 U CN213956063 U CN 213956063U CN 202022589871 U CN202022589871 U CN 202022589871U CN 213956063 U CN213956063 U CN 213956063U
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Abstract
A heat exchange system for aluminum oxide smelting comprises a refined liquid pipeline (1), a mother liquid pipeline (2) and a heat exchanger (3), wherein the refined liquid pipeline is a first refined liquid pipeline, a second refined liquid pipeline and a third refined liquid pipeline; the heat exchanger (3) is a winding tube type heat exchanger with one shell pass and at least two tube passes, a shell pass inlet connecting pipe (31) is connected with a mother liquor pipeline, and a shell pass outlet connecting pipe (32) is connected with downstream equipment; the first tube side inlet connecting tube (33) is connected with the first semen pipeline (11); the first tube pass outlet connecting tube (34) is connected to the first section of the decomposition tank (6) through an intermediate pipeline (5), and the third semen pipeline (13) is connected with the intermediate pipeline (5); the second tube pass inlet connecting pipe (35) is connected with the second semen pipeline (12), and the second tube pass outlet connecting pipe (36) is connected to the two-section decomposition tank (8). Compared with the prior art the utility model discloses only need a heat exchanger can realize semen and the hierarchical heat transfer of mother liquor.
Description
Technical Field
The utility model belongs to the technical field of the aluminium oxide is smelted, concretely relates to a heat transfer system for aluminium oxide is smelted.
Background
The existing production process of alumina mainly comprises a Bayer process, a sintering process and a Bayer-sintering combined process. The Bayer process mainly adopts NaOH aqueous solution to dissolve out bauxite, and then directly carries out dilution, desilication and seed separation to obtain aluminum hydroxide. The refined liquid at about 100 ℃ in the Bayer process alumina crystal seed decomposition production process is conveyed to a refined liquid heat exchanger through a refined liquid pump to exchange heat with the mother liquid from a mother liquid tank, so that the refined liquid is subjected to graded heat exchange to about 75 ℃ and about 65 ℃, the mother liquid can be heated simultaneously in the heat exchange process, and the temperature of the mother liquid when entering an evaporation workshop is increased.
The present semen heat exchanger generally adopts detachable plate heat exchanger, like the heat transfer system that chinese utility model patent No. ZL 201921430557.3's "semen cooling plate heat transfer system" (No. CN210689365U is announced to the grant) discloses including a plate heat exchanger, No. two plate heat exchangers and No. three plate heat exchangers, the semen that comes out from leaf filter passes through a plate heat exchanger in proper order as the heat source, enter the semen groove and constitute the semen pipeline after No. two plate heat exchangers and No. three plate heat exchangers, the mother liquor that comes out from the vertical disc filter passes through a plate heat exchanger in proper order and a plate heat exchanger gets into the raw liquor groove and constitutes the mother liquor pipeline, No. three plate heat exchanger's cold medium entry and cold medium export are connected with cooling circuit's outlet pipe and wet return respectively.
For example, the heat exchange process for producing sandy alumina by two-stage decomposition (publication number CN100381359C) disclosed in chinese patent No. ZL200610046069.3 is as follows: the overflow seed precipitation mother liquor of the vertical disc filter exchanges heat with the first-stage decomposed slurry through the wide-runner plate heat exchanger, and the seed precipitation mother liquor after primary heat exchange goes to the plate heat exchanger to exchange heat with the refined liquid for secondary heat exchange.
The existing heat exchange system and the existing heat exchange process can improve the heat exchange efficiency to a certain extent, but have the following problems: 1. the number of the adopted plate heat exchangers is more, and the number of the adopted plate heat exchangers is two or more than two. 2. The solubility of substances such as silicon oxide in the refined liquid is reduced along with the temperature change, and then the substances are easy to scab on equipment such as plates and the like, so that the heat exchange efficiency is poor, and the pressure drop is increased until the equipment cannot run; in order to overcome the defect of scabbing, when the scale inhibitor is actually used, cold and hot media are exchanged to produce after running for a period of time so as to reduce the heat transfer coefficient influenced by scale inhibition, further increase the service cycle, and the scale inhibitor needs to be chemically cleaned by high-concentration sodium hydroxide every 7-10 days; meanwhile, with the increase of the operation time, the plate is required to be disassembled after chemical cleaning, and then the plate is scrubbed by a steel brush, so that the risk of leakage of the heat exchanger is easily caused by disassembling and cleaning. 3. The refined solution and the mother solution contain a large amount of caustic alkali, have high chloride ion concentration and have strong corrosivity. 4. When the heat exchanger just starts to operate, the flow of the semen is low, and the plate heat exchanger is easy to scale. If the technical problem can be solved, the method has positive significance for the progress of the alumina smelting process.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the first technical problem that to prior art's current situation, provide a heat transfer system for aluminium oxide is smelted that only needs a heat exchanger can realize semen and the hierarchical heat transfer of mother liquor.
The second technical problem to be solved by the utility model is to provide a heat exchange system for alumina smelting that can reduce the heat exchanger and leak the risk.
The utility model provides a technical scheme that above-mentioned first technical problem adopted does: the utility model provides a heat transfer system for aluminium oxide is smelted, is including the seminal fluid pipeline that is used for carrying the seminal fluid, the mother liquor pipeline that is used for carrying the mother liquor and be used for carrying out the heat exchanger of heat transfer to seminal fluid and mother liquor which characterized in that:
the semen pipeline is divided into at least three parts, namely a first semen pipeline for conveying a first strand of semen, a second semen pipeline for conveying a second strand of semen and a third semen pipeline for conveying a third strand of semen;
the heat exchanger is a wound tube type heat exchanger with one shell pass and at least two tube passes, a shell pass inlet connecting tube and a shell pass outlet connecting tube which are communicated with the shell pass are arranged on the wound tube type heat exchanger, a first tube pass inlet connecting tube and a first tube pass outlet connecting tube which are communicated with the first tube pass are communicated, and a second tube pass inlet connecting tube and a second tube pass outlet connecting tube which are communicated with the second tube pass are arranged on the wound tube type heat exchanger;
the shell side inlet connecting pipe is connected with the outlet end of the mother liquor pipeline so that mother liquor can flow into the shell side, and the shell side outlet connecting pipe is connected with downstream equipment;
the first tube side inlet connecting tube is connected with the outlet end of the first semen pipeline so as to allow a first strand of semen to flow into the first tube side; the first tube side outlet connecting tube is connected to the first section of the decomposition tank through an intermediate pipeline, and the outlet end of the third semen pipeline is connected with the intermediate pipeline so as to mix the third strand of semen with the first strand of heat-exchanged semen and further improve the temperature of the semen in the intermediate pipeline;
the second tube pass inlet connecting tube is connected with the outlet end of the second semen pipeline so that a second strand of semen flows into the second tube pass, and the second tube pass outlet connecting tube is connected to the two-section decomposition tank.
Preferably, the heat exchanger is a double-flow wound tube heat exchanger having one shell side and two tube sides. The structure can be further simplified while the heat exchange efficiency of the double-strand wound tube type heat exchanger can be guaranteed.
To further solve the second technical problem, preferably, the heat exchanger includes the following components:
a housing;
a first tube sheet disposed on one end of the shell;
a second tube sheet disposed on the other end of the shell;
the first group of heat exchange tubes are positioned in the shell, and two ends of the first group of heat exchange tubes are respectively limited on the first tube plate and the second tube plate;
the second group of heat exchange tubes are positioned in the shell, and two ends of the second group of heat exchange tubes are respectively limited on the first tube plate and the second tube plate;
the first tube box is arranged on the first tube plate;
the second tube box is arranged on the second tube plate;
all the components are connected in a welding mode;
the shell pass inlet connecting pipe and the shell pass outlet connecting pipe are arranged on the shell, the first tube pass inlet connecting pipe and the first tube pass outlet connecting pipe are arranged on the first tube box and the second tube box and are communicated with the first group of heat exchange tubes, and the second tube pass inlet connecting pipe and the second tube pass outlet connecting pipe are arranged on the first tube box and the second tube box and are communicated with the second group of heat exchange tubes. The connection strength and the connection stability of all parts can be ensured by a welding mode, and the risk of leakage of the heat exchanger is reduced; and owing to adopt winding tubular heat exchanger in this application, compare in plate heat exchanger and can reduce the risk of scabbing through the velocity of flow of control tube side medium and shell side medium, need not to wash the heat exchanger, so can directly carry out welded connection with the part, need not to design like plate heat exchanger and can unpick and wash the structure.
In order to reduce the corrosion of the heat exchanger caused by the refined liquid and the mother liquid, the material of the inner wall of the shell and the material of each heat exchange tube are preferably austenitic stainless steel with the mark of 254 SMO. The outer wall of the shell can be made of stainless steel, carbon steel and the like.
Further, a precipitation separation device for filtering the passing mother liquor is connected to the mother liquor pipeline.
Further, the downstream equipment comprises an evaporation plant. The mother liquor with the temperature rising after heat exchange with the refined liquid can be directly conveyed to an evaporation workshop for the next working procedure.
The specific method for the heat exchange of the heat exchange system comprises the following steps:
inputting the mother liquor into the shell side of the heat exchanger for heat exchange, wherein the inlet temperature of the mother liquor entering the heat exchanger is 50-57 ℃, and the temperature of the mother liquor after heat exchange is increased to 86-92 ℃;
dividing the semen into three streams, namely a first stream of semen, a second stream of semen and a third stream of semen, wherein the mass flow rate of the second stream of semen is 1.3-1.6 of the mass flow rate of the first stream of semen, and the mass flow rate of the second stream of semen is 0.9-1.1 of the mass flow rate of the first stream of semen and the third stream of semen; the mass flow rate of the semen is 0.9-1.1, the first strand of the semen and the second strand of the semen respectively enter corresponding tube passes in a heat exchanger and exchange heat with the mother liquor in a shell pass, the inlet temperature of the first strand of the semen and the second strand of the semen when entering the heat exchanger is 100-105 ℃, the temperature of the first strand of the semen and the second strand of the semen after heat exchange is reduced to 62-68 ℃, and the second strand of the semen after heat exchange is conveyed to a two-section decomposition tank for decomposition; the temperature of the third strand of semen is 100-105 ℃, the third strand of semen is directly mixed with the first strand of heat-exchanged semen to obtain mixed semen with the temperature of 72-78 ℃, and the mixed semen is conveyed to a section of decomposition tank for decomposition.
Preferably, the medium flow velocity in the tube side is 1.6-2.5 m/s, and the medium flow velocity in the shell side is 0.8-1.5 m/s. When the flow rate of the medium is too low, the risk of easy scaling exists; when the medium flow velocity is too high, the fluid easily scours the inner walls of the tube pass and the shell pass, and the problem of equipment vibration exists. Therefore, it is of great significance to select a medium flow rate within a suitable range.
More preferably, the first strand of semen and the second strand of semen can enter respective tube passes simultaneously for heat exchange; or the first strand of semen and the second strand of semen enter respective tube passes in tandem to exchange heat; or only the first strand of semen enters the corresponding first tube pass to exchange heat, and the second strand of semen is not introduced into the second tube pass; or only the second strand of semen enters the corresponding second tube pass for heat exchange, and the first tube pass is not communicated with the first strand of semen. When the flow rate of the semen is low, only one tube pass can be adopted for heat exchange, and the other tube pass does not carry the semen, so that the risk of tube pass scaling caused by low load is reduced; when the flow of the semen is high, two tube passes can be adopted for heat exchange at the same time. Therefore, the method has higher flexibility and selectivity, and a user can select according to specific working conditions.
Compared with the prior art, the utility model has the advantages of: through the winding tubular heat exchanger with heat exchanger design for having a shell side and two at least tube sides, divide into three at least strands with the semen pipeline, wherein first strand seminal fluid and the second strand seminal fluid walk the tube side that corresponds separately, and carry out the heat transfer with the mother liquor of shell side, reduce the temperature of these two strands of seminal fluids in order to improve the mother liquor temperature, the first strand seminal fluid that will export from the tube side simultaneously mixes and then improves the temperature of first strand seminal fluid with the third strand seminal fluid that does not pass through the heat transfer, be applicable to one section decomposer, the lower two-stage decomposition groove that is applicable to of the temperature of second strand seminal fluid, so, the utility model discloses only need set up a heat exchanger can realize the hierarchical heat transfer of seminal fluid and mother liquor, simple structure and heat exchange efficiency are higher. Just the utility model discloses a heat transfer simple process just can reach the effect that adopts many plate heat exchangers to carry out the heat transfer among the prior art through a heat exchanger.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments.
As shown in figure 1, the preferred embodiment of the heat exchange system for aluminum oxide smelting of the present invention comprises: a semen pipeline 1 for conveying semen, a mother liquor pipeline 2 for conveying mother liquor and a heat exchanger 3.
Wherein, semen pipeline 1 includes total semen pipeline 10 and three strands of reposition of redundant personnel semen pipelines, and the exit end of total semen pipeline 10 is linked together with the entry end of three strands of reposition of redundant personnel semen pipelines, and the junction can set up parts such as valve as required to divide into three strands of semen with total semen. The three shunt semen lines are respectively a first semen line 11 for delivering a first strand of semen, a second semen line 12 for delivering a second strand of semen, and a third semen line 13 for delivering a third strand of semen.
The inlet end of the mother liquor pipeline 2 is connected with the last tank 81 of the second-stage decomposition tank 8 (of course, the last tank of the first-stage decomposition tank or the collecting tank for collecting the mother liquor can be connected), and the mother liquor pipeline 2 is connected with the precipitation separation device 4 for filtering the passing mother liquor.
The heat exchanger 3 is a double-flow wound tube heat exchanger with one shell pass and two tube passes, and the double-flow wound tube heat exchanger is provided with a shell pass inlet connecting tube 31 and a shell pass outlet connecting tube 32 which are communicated with the shell pass, a first tube pass inlet connecting tube 33 and a first tube pass outlet connecting tube 34 which are communicated with the first tube pass, and a second tube pass inlet connecting tube 35 and a second tube pass outlet connecting tube 36 which are communicated with the second tube pass;
wherein, the shell side inlet connecting pipe 31 is connected with the outlet end of the mother liquor pipeline 2 so as to allow the mother liquor to flow into the shell side, and the shell side outlet connecting pipe 32 is connected with the evaporation workshop 200;
the first tube side inlet connecting tube 33 is connected with the outlet end of the first semen pipeline 11 so as to allow the first stream of semen to flow into the first tube side; the first tube pass outlet connecting tube 34 is connected to the first section of the decomposition tank 6 through the middle tube line 5, and the outlet end of the third semen tube line 13 is connected with the middle tube line 5 so as to mix the third strand of semen with the first strand of heat-exchanged semen and further improve the temperature of the semen in the middle tube line 5;
the second tube side inlet connecting pipe 35 is connected with the outlet end of the second semen pipeline 12 to allow the second strand of semen to flow into the second tube side, and the second tube side outlet connecting pipe 36 is connected to the two-section decomposition tank 8 through the second pipeline 7.
In this embodiment, the double-stream wound tube heat exchanger can be designed according to the prior art, and includes the following components: the shell, a first tube plate, a second tube plate, a first group of heat exchange tubes, a second group of heat exchange tubes, a first tube box and a second tube box, wherein the first tube plate and the second tube plate are arranged at two ends of the shell, the first tube box is arranged on the first tube plate, the second tube box is arranged on the second tube plate, and two ends of the first group of heat exchange tubes and the second group of heat exchange tubes are respectively limited on the first tube plate and the second tube plate. The shell side inlet connecting pipe 31 and the shell side outlet connecting pipe 32 are arranged on the shell, the first tube side inlet connecting pipe 33 and the first tube side outlet connecting pipe 34 are arranged on the first tube box and the second tube box and are communicated with the first group of heat exchange tubes, and the second tube side inlet connecting pipe 35 and the second tube side outlet connecting pipe 36 are arranged on the first tube box and the second tube box and are communicated with the second group of heat exchange tubes. In order to reduce the risk of leakage of the heat exchanger, the components are connected in a welding mode. In order to improve the corrosion resistance of the shell pass and the tube pass, the material of each heat exchange tube is austenitic stainless steel with the mark of 254 SMO; the shell is made of a composite material of austenitic stainless steel with the mark of 254SMO and carbon steel, wherein the outer wall of the shell is made of the carbon steel, and the inner wall of the shell is made of the austenitic stainless steel.
The first-stage decomposition tank 6 includes a plurality of first-stage decomposition tank units communicated with each other by a fluid, the second-stage decomposition tank 8 includes a plurality of second-stage decomposition tank units communicated with each other by a fluid, the last tank 81 of the second-stage decomposition tank 8 is one of the second-stage decomposition tank units, and the structure and connection relationship of the decomposition tanks are the same as those of the prior art and are not described herein.
The heat exchange method by adopting the heat exchange system comprises the following steps:
inputting the mother liquor into the shell side of the heat exchanger 3 for heat exchange, wherein the inlet temperature of the mother liquor entering the heat exchanger 3 is 50-57 ℃, and the temperature of the mother liquor after heat exchange is increased to 86-92 ℃;
dividing the semen into three streams, namely a first stream of semen, a second stream of semen and a third stream of semen, wherein the mass flow rate of the second stream of semen is 1.3-1.6 of the mass flow rate of the first stream of semen, and the mass flow rate of the second stream of semen is 0.9-1.1 of the mass flow rate of the first stream of semen and the third stream of semen; the mass flow rate of the semen is that the mass flow rate ratio of the mother liquor is 0.9-1.1, the first strand of the semen and the second strand of the semen respectively enter the corresponding tube pass in the heat exchanger 3 and exchange heat with the mother liquor in the shell pass, the inlet temperature of the first strand of the semen and the second strand of the semen when entering the heat exchanger 3 is 100-105 ℃, the temperature of the first strand of the semen and the second strand of the semen after heat exchange is reduced to 62-68 ℃, and the second strand of the semen after heat exchange is conveyed to the two-section decomposition tank 8 for decomposition; the temperature of the third strand of semen is 100-105 ℃, the third strand of semen is directly mixed with the first strand of heat-exchanged semen to obtain mixed semen with the temperature of 72-78 ℃, and the mixed semen is conveyed to the first section of decomposition tank 6 for decomposition. In the embodiment, in order to reduce the risk of the structure of the heat exchanger 3, the medium flow velocity in the tube side is 1.6-2.5 m/s, and the medium flow velocity in the shell side is more than 0.8-1.5 m/s.
In practical application, a first strand of semen and a second strand of semen can be selected according to the flow of the semen and simultaneously enter respective tube passes for heat exchange; or the first strand of the semen and the second strand of the semen enter respective tube passes in tandem to exchange heat; or only the first strand of semen enters the corresponding first tube pass to exchange heat, and the second strand of semen is not introduced into the second tube pass; and then or, only the second strand of semen enters the corresponding second tube pass for heat exchange, and the first tube pass does not pass the first strand of semen. The design is specifically carried out according to working conditions such as semen flow and load, for example, when the system just starts to operate, the semen flow is low, only one tube pass can be operated at the moment, and the other tube pass is closed, so that the risk of a tube pass structure caused by low load is reduced; the system operates for a period of time, and when the flow of semen is high, two tube passes can be operated simultaneously.
Claims (5)
1. The utility model provides a heat transfer system for aluminium oxide is smelted, is including being used for carrying semen pipeline (1) of seminal fluid, being used for carrying mother liquor pipeline (2) of mother liquor and being used for carrying out heat exchanger (3) of heat transfer to seminal fluid and mother liquor which characterized in that:
the semen pipeline (1) is divided into at least three parts, namely a first semen pipeline (11) for conveying a first semen, a second semen pipeline (12) for conveying a second semen and a third semen pipeline (13) for conveying a third semen;
the heat exchanger (3) is a wound tube type heat exchanger with one shell pass and at least two tube passes, a shell pass inlet connecting tube (31) and a shell pass outlet connecting tube (32) which are communicated with the shell pass are arranged on the wound tube type heat exchanger, a first tube pass inlet connecting tube (33) and a first tube pass outlet connecting tube (34) which are communicated with the first tube pass are communicated, and a second tube pass inlet connecting tube (35) and a second tube pass outlet connecting tube (36) which are communicated with the second tube pass are arranged on the wound tube type heat exchanger;
the shell side inlet connecting pipe (31) is connected with the outlet end of the mother liquid pipeline (2) so as to allow the mother liquid to flow into the shell side, and the shell side outlet connecting pipe (32) is connected with downstream equipment;
the first tube side inlet connecting tube (33) is connected with the outlet end of the first semen pipeline (11) so as to allow a first strand of semen to flow into the first tube side; the first tube side outlet connecting tube (34) is connected to the first section of the decomposition tank (6) through an intermediate pipeline (5), and the outlet end of the third semen pipeline (13) is connected with the intermediate pipeline (5) so as to mix the third strand of semen with the heat-exchanged first strand of semen and further improve the temperature of the semen in the intermediate pipeline (5);
the second tube side inlet connecting pipe (35) is connected with the outlet end of the second semen pipeline (12) so that a second strand of semen flows into the second tube side, and the second tube side outlet connecting pipe (36) is used for being connected to the two-section decomposition tank (8).
2. The heat exchange system of claim 1, wherein: the heat exchanger (3) is a double-flow wound tube heat exchanger with one shell side and two tube sides.
3. The heat exchange system of claim 2, wherein: the heat exchanger (3) comprises the following components:
a housing;
a first tube sheet disposed on one end of the shell;
a second tube sheet disposed on the other end of the shell;
the first group of heat exchange tubes are positioned in the shell, and two ends of the first group of heat exchange tubes are respectively limited on the first tube plate and the second tube plate;
the second group of heat exchange tubes are positioned in the shell, and two ends of the second group of heat exchange tubes are respectively limited on the first tube plate and the second tube plate;
the first tube box is arranged on the first tube plate;
the second tube box is arranged on the second tube plate;
all the components are connected in a welding mode;
the shell side inlet connecting pipe (31) and the shell side outlet connecting pipe (32) are arranged on the shell, the first tube side inlet connecting pipe (33) and the first tube side outlet connecting pipe (34) are arranged on the first tube box and the second tube box and communicated with the first group of heat exchange tubes, and the second tube side inlet connecting pipe (35) and the second tube side outlet connecting pipe (36) are arranged on the first tube box and the second tube box and communicated with the second group of heat exchange tubes.
4. The heat exchange system of claim 1, wherein: and a precipitation separation device (4) for filtering the passing mother liquor is connected to the mother liquor pipeline (2).
5. The heat exchange system of claim 1, wherein: the downstream equipment comprises an evaporation plant (200).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022589871.5U CN213956063U (en) | 2020-11-10 | 2020-11-10 | Heat exchange system for aluminum oxide smelting |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022589871.5U CN213956063U (en) | 2020-11-10 | 2020-11-10 | Heat exchange system for aluminum oxide smelting |
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| CN213956063U true CN213956063U (en) | 2021-08-13 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112254552A (en) * | 2020-11-10 | 2021-01-22 | 镇海石化建安工程有限公司 | Heat exchange system and heat exchange process for aluminum oxide smelting |
| CN115597402A (en) * | 2022-09-30 | 2023-01-13 | 镇海石化建安工程股份有限公司（Cn） | Heat exchange assembly for hydrogenation device and heat exchange process |
-
2020
- 2020-11-10 CN CN202022589871.5U patent/CN213956063U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112254552A (en) * | 2020-11-10 | 2021-01-22 | 镇海石化建安工程有限公司 | Heat exchange system and heat exchange process for aluminum oxide smelting |
| CN112254552B (en) * | 2020-11-10 | 2024-05-31 | 镇海石化建安工程股份有限公司 | Heat exchange system and heat exchange process for aluminum oxide smelting |
| CN115597402A (en) * | 2022-09-30 | 2023-01-13 | 镇海石化建安工程股份有限公司（Cn） | Heat exchange assembly for hydrogenation device and heat exchange process |
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Address after: 315207 Jiaochuan Street Refining Road, Zhenhai District, Ningbo City, Zhejiang Province Patentee after: Zhenhai Petrochemical Construction and Installation Engineering Co.,Ltd. Address before: 315207 Jiaochuan Street Refining Road, Zhenhai District, Ningbo City, Zhejiang Province Patentee before: ZHENHAI PETROCHEMICAL JIANAN ENGINEERING Co.,Ltd. |
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