CN112414935B - Seawater desalination corrosion test method - Google Patents

Seawater desalination corrosion test method Download PDF

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Publication number
CN112414935B
CN112414935B CN202011510313.3A CN202011510313A CN112414935B CN 112414935 B CN112414935 B CN 112414935B CN 202011510313 A CN202011510313 A CN 202011510313A CN 112414935 B CN112414935 B CN 112414935B
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corrosion
test
test box
corrosion test
seawater
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CN112414935A (en
Inventor
崔少平
徐克�
叶建林
孙万仓
李强
张�成
郗大来
李宁
童路
贺旭明
左彬
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Xi'an United Pressure Vessel Co ltd
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Xi'an United Pressure Vessel Co ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
    • G01N17/002—Test chambers
    • 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
    • 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
    • Y02A20/131—Reverse-osmosis

Abstract

The invention discloses a seawater desalination corrosion test method, which comprises the following steps: 1. mounting a hanging piece assembly in a first corrosion test box; 2. mounting a hanging piece assembly in a second corrosion test box; 3. connecting a seawater desalination corrosion testing device; 4. testing the hanging piece assembly; 5. and obtaining the corrosion rate. The invention has reasonable design, is convenient for mounting and hanging the test piece, can provide good gas phase environment, gas-liquid phase environment and liquid phase environment, realizes the test of the corrosion rate of the test piece under the gas phase environment, the gas-liquid phase environment and the liquid phase environment, is convenient for deeply researching the corrosion behavior of the test piece material, and further provides a basis for selecting the material used by the seawater desalination equipment.

Description

Seawater desalination corrosion test method
Technical Field
The invention belongs to the technical field of seawater desalination material corrosion, and particularly relates to a seawater desalination corrosion test method.
Background
Sea water desalination, namely, sea water desalination is utilized to produce fresh water. The technical process of separating salt and water in seawater is used for obtaining fresh water and concentrated brine. Mainly including distillation, reverse osmosis, electrodialysis, etc. Distillation is the freshwater treatment process in most gulf countries and is also the main source of its freshwater. The system has stable and reliable operation and high fresh water productivity.
However, in long runs, corrosion still presents a serious threat to the overall process, especially in the heat recovery stage. Regular parking maintenance has certain influence and restriction on the long-term high-efficiency operation of the whole system. The thickness of the added material far exceeds the designed thickness, and the corrosion allowance is thickened, so that the whole design is overweight, the cost of the whole set of equipment is increased, the capacity of a unit is limited, and the use of the material in certain specific environments such as ships and warships is influenced. It is important to study the corrosion behavior of the material in the long-term exposure to seawater vapor environment.
Therefore, a seawater desalination corrosion test method is lacking at present, a test piece is convenient to mount and hang, good gas phase environment, gas-liquid phase environment and liquid phase environment can be provided, the corrosion rate of the test piece in the gas phase environment, the gas-liquid phase environment and the liquid phase environment can be tested, the corrosion behavior of the test piece material can be conveniently and deeply researched, and a basis is further provided for selection of materials used by seawater desalination equipment.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a seawater desalination corrosion test method aiming at the defects in the prior art, which has the advantages of reasonable design, convenient installation and hanging of a test piece, and capability of providing good gas phase environment, gas-liquid phase environment and liquid phase environment, realizing the test of the corrosion rate of the test piece in the gas phase environment, the gas-liquid phase environment and the liquid phase environment, facilitating the deep research on the corrosion behavior of the test piece material, and further providing a basis for the selection of materials used by seawater desalination equipment.
In order to solve the technical problems, the invention adopts the technical scheme that: a seawater desalination corrosion test method is characterized in that an adopted device comprises a test box body, a silk screen demister mechanism and a spraying mechanism, wherein the silk screen demister mechanism is arranged at the top in the test box body, the silk screen demister mechanism is higher than the spraying mechanism, a first hanging piece assembly, a second hanging piece assembly and a third hanging piece assembly are sequentially arranged in the test box body from top to bottom, the first hanging piece assembly is arranged between the silk screen demister mechanism and the spraying mechanism, the third hanging piece assembly is arranged at the bottom of the test box body, the second hanging piece assembly is arranged between the spraying mechanism and the third hanging piece assembly, the spraying mechanism is higher than the second hanging piece assembly and the third hanging piece assembly, the first hanging piece assembly, the second hanging piece assembly and the third hanging piece assembly are detachably connected with the test box body, the first hanging piece assembly, the second hanging piece assembly and the third hanging piece assembly comprise a plurality of test pieces, the bottom of the test box body is filled with seawater, and the third hanging piece assembly is arranged in the seawater, and the method comprises the following steps:
step one, mounting a coupon component in a first corrosion test box:
step 101, inserting stud bolts into mounting holes in a supporting rib plate, sleeving two symmetrically-arranged test pieces on each stud bolt, and mounting nuts at two ends of each stud bolt; the number of the stud bolts is multiple, and the stud bolts are distributed along the length direction of the support rib plate;
102, inserting the slide rail frame with the test piece installed through a first installation interface, and placing the slide rail frame on a track on the inner side wall of the test box body in a sliding mode until one end, far away from the first installation interface, of the slide rail frame is attached to the end portion of the track, so that installation of the first hanging piece assembly is completed;
103, inserting the slide rail frame with the test piece installed through the second installation interface according to the method in the step 101 and the step 102 until one end, far away from the second installation interface, of the slide rail frame is attached to the end part of the rail, and completing installation of the second hanging piece assembly;
step 104, inserting the slide rail frame with the test piece installed through the third installation interface according to the method in the steps 101 and 102 until one end, far away from the third installation interface, of the slide rail frame is attached to the end part of the rail, and completing installation of the third hanging piece assembly;
step 105, mounting a first flange blind plate and a second flange blind plate on the middle test piece sampling port and the lower test piece sampling port respectively;
106, mounting flange covers at the first mounting interface, the second mounting interface and the third mounting interface respectively; a sealing gasket is arranged between the flange and the flange cover, and the mounting of the hanging piece assembly in the first corrosion test box is completed to obtain the first corrosion test box;
step two, mounting a coupon component in a second corrosion test box:
according to the method in the step one, the mounting of the coupon component in the second corrosion test box is completed to obtain a second corrosion test box;
step three, connecting the seawater desalination corrosion testing device:
connecting a seawater tank with a shell-and-tube condenser, a first plate heat exchanger and a second plate heat exchanger, and connecting the shell-and-tube condenser with an evaporation concentrator, wherein the evaporation concentrator provides steam for a first corrosion test box and a second corrosion test box;
the first buffer water tank provides seawater for the first corrosion test tank, and the second buffer water tank provides seawater for the second corrosion test tank;
step four, testing the hanging piece assembly:
step 401, operating the evaporation concentrator to work, wherein steam output from a hot end outlet of the evaporation concentrator enters a first corrosion test box through a first steam pipeline and a steam inlet joint;
steam output from a hot end outlet of the evaporation concentrator enters a second corrosion test box through a second steam pipeline and a steam inlet joint;
step 402, operating a first seawater circulating pump and a second seawater circulating pump to work, and conveying seawater in a first buffer water tank to a ferrule type joint in the first corrosion test tank through a first water tank pipeline, a first seawater circulating pump and a first conveying pipeline;
conveying the seawater in the second buffer water tank to a ferrule type joint in the second corrosion test tank through a second water tank pipeline, a second seawater circulating pump and the second conveying pipeline;
step 403, spraying seawater in the spray pipe in the first corrosion test box through a nozzle, and spraying seawater in the spray pipe in the second corrosion test box through a nozzle;
step 404, during the process of introducing steam and seawater into the first corrosion test box, a first pressure sensor on the first corrosion test box detects a first pressure in the first corrosion test box, so that the first pressure in the first corrosion test chamber meets a first pressure set value; wherein the first pressure set value is 12 kPa-15 kPa;
in the process of introducing steam and seawater into the second corrosion test box, a second pressure sensor on the second corrosion test box detects second pressure in the second corrosion test box so as to enable the second pressure in the second corrosion test box to meet a second pressure set value; wherein the second pressure set value is 20 kPa-30 kPa;
step five, obtaining the corrosion rate:
step 501, in the process of introducing steam and seawater into the first corrosion test box, a first temperature sensor on the first corrosion test box detects the first temperature in the first corrosion test box, in the process of introducing steam and seawater into the second corrosion test box, a second temperature sensor on the second corrosion test box detects the second temperature in the second corrosion test box, the first temperature detected by the first temperature sensor and the second temperature detected by the second temperature sensor both meet the 1 st test temperature value, the first corrosion test box and the second corrosion test box are tested, and the specific process is as follows:
step 5011, in the process of introducing steam and seawater into the first corrosion test box and the second corrosion test box, waiting for a first test time t 1 Then, respectively taking out the first coupon assembly, the second coupon assembly and the third coupon assembly from the first corrosion test box and the second corrosion test box;
step 5012, according to the formula
Figure BDA0002846205470000041
Obtaining the corrosion rate of a jth test piece in an ith coupon assembly in a first corrosion test box at a 1 st test temperature value during a first test; wherein i and j are positive integers, and i is more than or equal to 1 and less than or equal to3,N represents the number of test pieces in the first, second and third coupon assemblies, j is greater than or equal to 1 and less than or equal to N, m 0 Denotes the initial mass of the specimen, s denotes the surface area of the specimen, p denotes the density of the specimen, and/or>
Figure BDA0002846205470000042
Representing the quality of a jth test piece in an ith coupon assembly in a first corrosion test box after the first test;
step 5013, according to the formula
Figure BDA0002846205470000043
Obtaining the average corrosion rate of the ith coupon assembly in the first corrosion test box at the 1 st test temperature value during the first test;
step 5014, according to the formula
Figure BDA0002846205470000051
Obtaining the corrosion rate of a jth test piece in an ith coupon assembly in a second corrosion test box at a 1 st test temperature value during a first test; wherein it is present>
Figure BDA0002846205470000052
Representing the quality of a jth test piece in an ith coupon assembly in a second corrosion test box after the first test;
step 5015, according to the formula
Figure BDA0002846205470000053
Obtaining the average corrosion rate of the ith coupon assembly in the second corrosion test box at the 1 st test temperature value during the first test;
step 5016, according to the method of the steps 5011 to 5015, testing the first corrosion test box and the second corrosion test box for the kth time until the kth test time t is reached k Then, obtaining the average corrosion rate of the ith coupon assembly in the first corrosion test box at the 1 st test temperature value during the kth test and the average corrosion rate of the ith coupon assembly in the second corrosion test box at the 1 st test temperature value during the kth test;
step 5017, repeating the steps 5011 to 5015K times, and performing the Kth test on the first corrosion test box and the second corrosion test box until the Kth test time t is reached K Then, obtaining the average corrosion rate of the ith coupon assembly in the first corrosion test box at the 1 st test temperature value during the Kth test and the average corrosion rate of the ith coupon assembly in the second corrosion test box at the 1 st test temperature value during the Kth test; wherein K and K are positive integers, K is more than or equal to 1 and less than or equal to K, and K represents the total times of the test;
step 502, according to the method of step 501, testing a first corrosion test box and a second corrosion test box to obtain an average corrosion rate of an ith coupon assembly in the first corrosion test box at the l test temperature value when tested for K times and an average corrosion rate of the ith coupon assembly in the second corrosion test box at the l test temperature value when tested for K times, so that a first temperature detected by a first temperature sensor and a second temperature detected by a second temperature sensor both satisfy the l test temperature value;
step 503, repeating step 501 for L times to enable the first temperature detected by the first temperature sensor and the second temperature detected by the second temperature sensor to both meet the L-th test temperature value, and testing the first corrosion test box and the second corrosion test box to obtain the average corrosion rate of the ith coupon assembly in the first corrosion test box at the L-th test temperature value during the K-time tests and the average corrosion rate of the ith coupon assembly in the second corrosion test box at the L-th test temperature value during the K-time tests; wherein L and L are positive integers, and L is more than or equal to 1 and less than or equal to L;
step six, obtaining the maximum corrosion rate:
step 601, testing time t k The average corrosion rate is used as a vertical coordinate, an average corrosion rate time-varying curve of the ith coupon assembly in the first corrosion test box under each test temperature value is obtained, and the maximum corrosion rate of the ith coupon assembly in the first corrosion test box is obtained from the average corrosion rate time-varying curve of the ith coupon assembly in the first corrosion test box under each test temperature value;
step 602, test the time t k And taking the average corrosion rate as a vertical coordinate to obtain an average corrosion rate time-varying curve of the ith coupon assembly in the second corrosion test box at each test temperature value, and obtaining the maximum corrosion rate of the ith coupon assembly in the second corrosion test box from the average corrosion rate time-varying curve of the ith coupon assembly in the second corrosion test box at each test temperature value.
The seawater desalination corrosion test method is characterized by comprising the following steps: in the third step, the seawater tank is connected with a shell-and-tube condenser, a first plate heat exchanger and a second plate heat exchanger, the shell-and-tube condenser is connected with an evaporation concentrator, and the evaporation concentrator provides steam for a first corrosion test box and a second corrosion test box; the first buffer water tank provides seawater for the first corrosion test box, the second buffer water tank provides seawater for the second corrosion test box, and the specific process is as follows:
301, connecting a seawater tank with input ports of a first seawater cooling pump and a second seawater cooling pump, connecting an output port of the first seawater cooling pump with a cold end inlet of a first plate heat exchanger through a first pipeline, connecting an output port of the first seawater cooling pump with a cold end inlet of a second plate heat exchanger through a second pipeline, and connecting an output port of the second seawater cooling pump with a cold end inlet of a shell-and-tube condenser through a third pipeline;
the cold end outlet of the first plate heat exchanger, the cold end outlet of the second plate heat exchanger and the cold end outlet of the shell-and-tube condenser are connected with a circulating seawater tank through seawater pipelines;
step 302, connecting a first buffer water tank with an input port of a first seawater circulating pump through a first water tank pipeline, wherein an output port of the first seawater circulating pump is connected with a first conveying pipeline, and the first conveying pipeline is connected with a ferrule type joint in the first corrosion test box;
connecting a second buffer water tank with an input port of a second seawater circulating pump through a second water tank pipeline, connecting an output port of the second seawater circulating pump with a second conveying pipeline, and connecting the second conveying pipeline with a ferrule type joint in a second corrosion test box;
the circulating seawater tank is connected with an input port of a third seawater circulating pump through a third water tank pipeline, an output port of the third seawater circulating pump is connected with a third conveying pipeline, and the third conveying pipeline is connected with the evaporation concentrator;
303, connecting a hot end outlet of the evaporation concentrator with a first steam pipeline, a second steam pipeline and a third steam pipeline, wherein the first steam pipeline is connected with a steam inlet joint in a first corrosion test box, the second steam pipeline is connected with a steam inlet joint in a second corrosion test box, and the third steam pipeline is connected with a hot end inlet of a shell-and-tube condenser;
step 304, connecting a steam outlet joint in the first corrosion test box with a first steam output pipeline, connecting a steam outlet joint in the second corrosion test box with a second steam output pipeline, connecting the first steam output pipeline with a hot end inlet of the first plate heat exchanger, and connecting the second steam output pipeline with a hot end inlet of the second plate heat exchanger;
the hot end outlet of the shell-and-tube condenser is connected with the fresh water tank through a third fresh water pipeline, the first fresh water buffer tank through a fourth fresh water pipeline and the second fresh water buffer tank through a fifth fresh water pipeline;
305, connecting a seawater outlet joint in a first corrosion test tank with a first buffer water tank through a first circulating pipeline; the seawater outlet joint in the second corrosion test tank is connected with a second buffer water tank through a second circulating pipeline;
and step 306, connecting the first buffer water tank with a first discharge pipeline, connecting the second buffer water tank with a second discharge pipeline, connecting the circulating sea water tank with a third discharge pipeline, and connecting the first discharge pipeline, the second discharge pipeline and the third discharge pipeline with the sea water tank through a circulating main pipeline.
The seawater desalination corrosion test method is characterized by comprising the following steps: the test box body comprises a bottom plate, a cover plate and four vertical side plates connected between the bottom plate and the cover plate, and the test box body is internally of a hollow structure;
the steam outlet joint is arranged on the bottom plate, the outlet of the seawater outlet joint is a seawater outlet, a clamping sleeve type joint is arranged on the vertical side plate, and the inlet of the clamping sleeve type joint is a seawater inlet.
The seawater desalination corrosion test method is characterized by comprising the following steps: the spraying mechanism comprises a spraying pipe communicated with the ferrule type joint, a nozzle base installed on the spraying pipe and a nozzle installed on the nozzle base, the spraying pipe is horizontally arranged, the outlet of the nozzle faces downwards vertically, a supporting pipe is arranged on the inner side wall of the testing box body, one end, away from the ferrule type joint, of the spraying pipe extends into the supporting pipe, and an end cover is installed at one end, away from the ferrule type joint, of the spraying pipe.
The seawater desalination corrosion test method is characterized by comprising the following steps: the wire mesh demister mechanism comprises two rib plates symmetrically arranged on the inner side wall of the test box body, supporting plates arranged on the two rib plates, grid plates arranged on the supporting plates and wire meshes arranged on the grid plates, press blocks are arranged on the wire meshes, the number of the press blocks is multiple, and the press blocks are arranged along the peripheral top surfaces of the wire meshes.
The seawater desalination corrosion test method is characterized by comprising the following steps: the test box comprises a test box body and is characterized in that a first installation interface, a second installation interface and a third installation interface are arranged on the test box body from top to bottom, the first installation interface, the second installation interface and the third installation interface are identical in structure, the first installation interface, the second installation interface and the third installation interface comprise a connecting pipe communicated with the test box body, a flange arranged at the end part of the connecting pipe and a flange cover connected with the flange, and a sealing gasket is arranged between the flange and the flange cover.
The seawater desalination corrosion test method is characterized by comprising the following steps: first lacing film subassembly, second lacing film subassembly and third lacing film subassembly all are the same, just first lacing film subassembly, second lacing film subassembly and third lacing film subassembly are all including installing track on the inside wall of test box, install the slide rail frame on the track and install the support rib plate in the slide rail frame to and multiunit lacing film group on the support rib plate is installed, a plurality of mounting holes have been seted up on the support rib plate, a plurality of mounting holes are followed support rib plate length direction lays, wear to be equipped with stud in the mounting hole, every group lacing film group all includes two test pieces of symmetry suit on stud, nut is installed at stud's both ends, the test piece is located between support rib plate and the nut.
The seawater desalination corrosion test method is characterized by comprising the following steps: in the fifth step, the units of K =6,K test times are all days, and then the first test time t is 1 =30, second test time t 2 =90, third test time t 3 =150, fourth test time t 4 =210, fifth test time t 5 =270, sixth test time t 6 ＝300；
The first test temperature value in the fifth step is marked as T l And the l-1 test temperature value is denoted as T l-1 ，T l ＝T l-1 +2 ℃ and the 1 st test temperature value T 1 =50 ℃, lth test temperature value T L ＝78℃。
The seawater desalination corrosion test method is characterized by comprising the following steps: and step six, acquiring the maximum corrosion rate, and then performing the following steps:
step A, recording the maximum corrosion rate of a 1 st coupon assembly in a first corrosion test box as the maximum corrosion rate of a first gas phase coupon, recording the maximum corrosion rate of a 2 nd coupon assembly as the maximum corrosion rate of a first gas-liquid phase coupon, and recording the maximum corrosion rate of a 3 rd coupon assembly as the maximum corrosion rate of a first liquid phase coupon;
step B, recording the maximum corrosion rate of the 1 st coupon assembly in a second corrosion test box as the maximum corrosion rate of a second gas-liquid phase coupon, recording the maximum corrosion rate of the 2 nd coupon assembly as the maximum corrosion rate of the second gas-liquid phase coupon, and recording the maximum corrosion rate of the 3 rd coupon assembly as the maximum corrosion rate of the second liquid phase coupon;
and step C, respectively obtaining a larger value of the maximum corrosion rate of the liquid-phase hanging piece, a larger value of the maximum corrosion rate of the gas-liquid-phase hanging piece and a larger value of the maximum corrosion rate of the gas-liquid-phase hanging piece according to the maximum corrosion rate of the first liquid-phase hanging piece and the maximum corrosion rate of the second liquid-phase hanging piece, the maximum corrosion rate of the first gas-liquid-phase hanging piece and the maximum corrosion rate of the second gas-phase hanging piece.
Compared with the prior art, the invention has the following advantages:
1. in the seawater desalination corrosion test, the invention can provide good gas phase environment, gas-liquid phase environment and liquid phase environment, realize the test of the corrosion rate of the test piece in the gas phase environment, the gas-liquid phase environment and the liquid phase environment, is convenient for deeply researching the corrosion behavior of the test piece material, and further provides a basis for selecting the material used by the seawater desalination equipment.
2. In the seawater desalination corrosion test process, the first hanging piece assembly is positioned between the silk screen demister mechanism and the spraying mechanism, the third hanging piece assembly is positioned at the bottom of the test box body, and the second hanging piece assembly is positioned between the spraying mechanism and the third hanging piece assembly, so that the first hanging piece assembly is in a gas phase environment, the second hanging piece assembly is in a gas-liquid phase environment, and the third hanging piece assembly is in a liquid phase environment.
3. In the seawater desalination corrosion test process, the first hanging piece assembly, the second hanging piece assembly and the third hanging piece assembly are detachably connected with the test box body, so that the first hanging piece assembly, the second hanging piece assembly and the third hanging piece assembly are convenient to install and detach.
4. In the seawater desalination corrosion test process, steam passes through the wire mesh demister, entrained mist can be removed, and the accuracy of a gas phase environment is improved; seawater in the spraying mechanism is sprayed out to the second hanging piece assembly through the nozzle, so that the second hanging piece assembly is in a gas-liquid phase environment, and the test piece material hanging piece can be independently and stably exposed in the gas-liquid environment. Still can make the bottom of test box fill through the sea water circulating pump and have the sea water, realize that third lacing film subassembly is in the liquid phase environment, make the stable exposure of test piece material lacing film ability independent in the liquid phase environment.
5. The seawater desalination corrosion test method has simple steps and reasonable design, realizes the acquisition of the maximum corrosion rate of the gas phase environment coupon assembly, the gas-liquid phase environment and the liquid phase environment in the corrosion test box, and ensures the accuracy of the seawater desalination corrosion side test.
6. The seawater desalination corrosion test method comprises the steps of firstly installing a coupon assembly in a first corrosion test box, then installing a coupon assembly in a second corrosion test box, then connecting a seawater desalination corrosion test device, then testing the coupon assembly to obtain the corrosion rate, and finally obtaining the maximum corrosion rates of the coupon assembly in a gas phase environment, a gas-liquid phase environment and a liquid phase environment in the corrosion test box, so that the corrosion rates of test pieces in the gas phase environment, the gas-liquid phase environment and the liquid phase environment are tested.
In conclusion, the device has reasonable design, is convenient to mount and hang and can provide good gas phase environment, gas-liquid phase environment and liquid phase environment, realize the test of the corrosion rate of the test piece in the gas phase environment, the gas-liquid phase environment and the liquid phase environment, facilitate the deep research of the corrosion behavior of the test piece material and further provide a basis for the selection of the material used by the seawater desalination equipment.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
FIG. 1 is a schematic structural diagram of an apparatus used in the present invention.
Fig. 2 is a top view of fig. 1.
Fig. 3 is a schematic structural diagram of a wire mesh demister mechanism of the device adopted by the invention.
FIG. 4 is a schematic view of the structure of the grid plate of the apparatus used in the present invention.
Fig. 5 is a schematic structural diagram of a first hanging piece assembly, a second hanging piece assembly and a third hanging piece assembly of the device adopted by the invention.
FIG. 6 is a schematic structural view of a support rib plate of the device of the present invention.
Fig. 7 is a schematic structural diagram of a slide rail frame of the device adopted in the present invention.
Fig. 8 is a schematic structural diagram of the present invention.
FIG. 9 is a block flow diagram of the present invention.
Description of reference numerals:
1-a bottom plate; 3-1-connecting pipe; 3, a flange;
4, a flange cover; 5, sealing a gasket;
8, a cutting sleeve type joint; 9-vertical side plate;
10-a wire mesh demister mechanism; 10-1-rib plate; 10-2-a support plate;
10-3-grid plate; 10-4-briquetting; 10-5-wire mesh;
11-steam inlet joint; 12-steam outlet connection; 13-cover plate;
14-1-supporting rib plate; 14-2-a slide rail frame; 14-3-track;
14-3-1-L shaped plate; 14-3-2-connecting plate; 14-4-nut;
14-5-stud; 14-6-test piece; 14-7-mounting holes;
15-a spray pipe; 16-end cap; 17-supporting the tube;
18-a nozzle base; 19-a nozzle;
20-flanged view mirror; 24-seawater outlet joint;
25 — a first mounting interface; 26-liquid level meter interface; 27-middle specimen sampling port;
28 — a second mounting interface; 29-lower specimen sampling port; 31 — a third mounting interface;
40-first corrosion test chamber; 40-1 — a first temperature sensor;
40-2 — a first pressure sensor; 41-second corrosion test chamber;
41-1 — a second temperature sensor; 41-2 — a second pressure sensor;
42-seawater tank; 42-1 — a first seawater cooling pump;
42-2 — a second seawater cooling pump; 42-3-seawater inlet pipe;
42-4 — recycle main line; 43 — a first plate heat exchanger; 44-a second plate heat exchanger;
45-shell-and-tube condenser; 46-an evaporative concentrator; 47 — a first buffer tank;
47-1 — first seawater circulation pump; 47-2 — first heater; 47-3 — first discharge line;
48-a second buffer water tank; 48-1 — a second seawater circulation pump;
48-2 — second heater; 48-3 — second discharge line; 49-circulating sea water tank;
49-1-a third seawater circulation pump; 49-2 — third heater; 49-3 — third discharge line;
49-4-valve; 50-fresh water tank; 50-1-fresh water pump;
51-a first fresh water buffer tank; and 52, a second fresh water buffer water tank.
Detailed Description
As shown in fig. 1, 2, 8 and 9, the device adopted in the method comprises a test box, a wire mesh demister mechanism 10 and a spray mechanism which are arranged in the test box, wherein the wire mesh demister mechanism 10 is positioned at the top in the test box, the wire mesh demister mechanism 10 is higher than the spray mechanism, a first hanging piece assembly, a second hanging piece assembly and a third hanging piece assembly are sequentially arranged in the test box from top to bottom, the first hanging piece assembly is positioned between the wire mesh demister mechanism 10 and the spray mechanism, the third hanging piece assembly is positioned at the bottom of the test box, the second hanging piece assembly is positioned between the spray mechanism and the third hanging piece assembly, the spray mechanism is higher than the second hanging piece assembly and the third hanging piece assembly, the first hanging piece assembly, the second hanging piece assembly and the third hanging piece assembly are detachably connected with the test box, the first hanging piece assembly, the second hanging piece assembly and the third hanging piece assembly all comprise a plurality of hanging pieces 14-6, and the test box is filled with a plurality of test pieces in seawater; the method comprises the following steps:
step one, installing a hanging piece assembly in a first corrosion test box:
step 101, inserting stud bolts 14-5 into mounting holes 14-7 on a support rib plate 14-1, sleeving two symmetrically-distributed test pieces 14-6 on each stud bolt 14-5, and mounting nuts 14-4 at two ends of each stud bolt 14-5; the number of the stud bolts 14-5 is multiple, and the multiple stud bolts 14-5 are distributed along the length direction of the support rib plate 14-1;
102, inserting the sliding rail frame 14-2 with the test piece 14-6 installed through the first installation interface 25, and placing the sliding rail frame on the track 14-3 on the inner side wall of the test box body in a sliding mode until one end, far away from the first installation interface 25, of the sliding rail frame 14-2 is attached to the end portion of the track 14-3, and completing installation of the first hanging piece assembly;
103, inserting the slide rail frame 14-2 with the test piece 14-6 installed through the second installation interface 28 according to the method in the step 101 and the step 102 until one end of the slide rail frame 14-2 far away from the second installation interface 28 is attached to the end of the rail 14-3, and completing installation of the second hanging piece assembly;
step 104, inserting the slide rail frame 14-2 with the test piece 14-6 installed through the third installation interface 31 according to the method in the steps 101 and 102 until one end of the slide rail frame 14-2 far away from the third installation interface 31 is attached to the end of the rail 14-3, and completing installation of the third hanging piece assembly;
step 105, mounting a first flange blind plate and a second flange blind plate on the middle test piece sampling port 27 and the lower test piece sampling port 29 respectively;
step 106, installing flange covers 4 at the first installation interface 25, the second installation interface 28 and the third installation interface 31 respectively; a sealing gasket 5 is arranged between the flange 3 and the flange cover 4, so that the mounting of the coupon assembly in the first corrosion test box is completed, and a first corrosion test box 40 is obtained;
step two, mounting the hanging piece assembly in a second corrosion test box:
according to the method in the first step, the mounting of the coupon assembly in the second corrosion test box is completed, and a second corrosion test box 41 is obtained;
step three, connecting the seawater desalination corrosion testing device:
connecting a seawater water tank 42 with a shell-and-tube condenser 45, a first plate heat exchanger 43 and a second plate heat exchanger 44, and connecting the shell-and-tube condenser 45 with an evaporation concentrator 46, wherein the evaporation concentrator 46 provides steam for the first corrosion test tank 40 and the second corrosion test tank 41;
a first buffer tank 47 provides seawater for the first corrosion test tank 40, and a second buffer tank 48 provides seawater for the second corrosion test tank 41;
step four, testing the hanging piece assembly:
step 401, operating the evaporation concentrator 46 to work, and allowing steam output from a hot end outlet of the evaporation concentrator 46 to enter the first corrosion test box 40 through the first steam pipeline and the steam inlet joint 11;
the steam output from the hot end outlet of the evaporator-concentrator 46 enters the second corrosion test chamber 41 through the second steam line and the steam inlet joint 11;
step 402, operating a first seawater circulating pump 47-1 and a second seawater circulating pump 48-1 to work, and conveying the seawater in the first buffer water tank 47 to the ferrule type joint 8 in the first corrosion test tank 40 through a first water tank pipeline, the first seawater circulating pump 47-1 and the first conveying pipeline;
conveying the seawater in the second buffer water tank 48 to the ferrule type joint 8 in the second corrosion test tank 41 through a second water tank pipeline, a second seawater circulating pump 48-1 and the second conveying pipeline;
step 403, spraying the seawater in the spray pipe 15 in the first corrosion test box 40 through the nozzle 19, and spraying the seawater in the spray pipe 15 in the second corrosion test box 41 through the nozzle 19;
step 404, in the process of introducing steam and seawater into the first corrosion test box 40, detecting a first pressure in the first corrosion test box 40 by a first pressure sensor 40-2 on the first corrosion test box 40 so as to enable the first pressure in the first corrosion test box 40 to meet a first pressure set value; wherein the first pressure set value is 12 kPa-15 kPa;
in the process of introducing steam and seawater into the second corrosion test box 41, a second pressure sensor 41-2 on the second corrosion test box 41 detects a second pressure in the second corrosion test box 41, so that the second pressure in the second corrosion test box 41 meets a second pressure set value; wherein the second pressure set value is 20 kPa-30 kPa;
step five, obtaining the corrosion rate:
step 501, in the process of introducing steam and seawater into the first corrosion test box 40, detecting a first temperature in the first corrosion test box 40 by the first temperature sensor 40-1 on the first corrosion test box 40, detecting a second temperature in the second corrosion test box 41 by the second temperature sensor 41-1 on the second corrosion test box 41 in the process of introducing steam and seawater into the second corrosion test box 41, and testing the first corrosion test box 40 and the second corrosion test box 41 when the first temperature detected by the first temperature sensor 40-1 and the second temperature detected by the second temperature sensor 41-1 both satisfy the 1 st test temperature value, wherein the specific process is as follows:
step 5011, in the process of introducing steam and seawater into the first corrosion test box 40 and the second corrosion test box 41, waiting for the first test time t 1 Then, respectively taking out the first coupon assembly, the second coupon assembly and the third coupon assembly from the first corrosion test box 40 and the second corrosion test box 41;
step 5012, according to the formula
Figure BDA0002846205470000151
Obtaining the corrosion rate of the jth test piece 14-6 in the ith coupon assembly in the first corrosion test box 40 at the 1 st test temperature value during the first test; wherein i and j are positive integers of 1I is more than or equal to 3,N represents the number of the test pieces 14-6 in the first hanging piece assembly, the second hanging piece assembly and the third hanging piece assembly, j is more than or equal to 1 and less than or equal to N, m 0 Indicates the initial mass of the specimen 14-6, s indicates the surface area of the specimen 14-6, ρ indicates the density of the specimen 14-6, and ` H `>
Figure BDA0002846205470000152
The quality of the jth test piece 14-6 in the ith coupon assembly in the first corrosion test box 40 after the first test is shown;
step 5013, according to the formula
Figure BDA0002846205470000153
Obtaining the average corrosion rate of the ith coupon assembly in the first corrosion test box 40 at the 1 st test temperature value during the first test;
step 5014, according to the formula
Figure BDA0002846205470000154
Obtaining the corrosion rate of the jth test piece 14-6 in the ith coupon assembly in the second corrosion test box 41 in the 1 st test temperature value during the first test; wherein it is present>
Figure BDA0002846205470000155
The quality of the jth test piece 14-6 in the ith coupon assembly in the second corrosion test box 41 after the first test is shown;
step 5015, according to the formula
Figure BDA0002846205470000161
Obtaining the average corrosion rate of the ith coupon assembly in the second corrosion test box 41 at the 1 st test temperature value during the first test;
step 5016, according to the method of the steps 5011 to 5015, the first corrosion testing box 40 and the second corrosion testing box 41 are tested for the kth time until the kth testing time t is reached k Then, the average corrosion rate of the ith coupon component in the first corrosion test box 40 in the kth test at the 1 st test temperature value and the ith corrosion test box 41 in the second corrosion test box 41 at the 1 st test temperature value are obtainedAverage corrosion rate of the coupon assembly during the kth test;
step 5017, repeating the steps 5011 to 5015K times, and performing the Kth test on the first corrosion test box 40 and the second corrosion test box 41 until the Kth test time t is reached K Then, obtaining the average corrosion rate of the ith coupon assembly in the first corrosion test box 40 in the Kth test at the 1 st test temperature value and the average corrosion rate of the ith coupon assembly in the second corrosion test box 41 in the Kth test at the 1 st test temperature value; wherein K and K are positive integers, K is more than or equal to 1 and less than or equal to K, and K represents the total times of the test;
step 502, according to the method described in 501, so that both the first temperature detected by the first temperature sensor 40-1 and the second temperature detected by the second temperature sensor 41-1 satisfy the l test temperature value, the first corrosion test box 40 and the second corrosion test box 41 are tested to obtain the average corrosion rate at the l test temperature value when the ith coupon assembly in the first corrosion test box 40 is tested for K times and the average corrosion rate at the l test temperature value when the ith coupon assembly in the second corrosion test box 41 is tested for K times;
step 503, repeating step 501 for L times to enable both the first temperature detected by the first temperature sensor 40-1 and the second temperature detected by the second temperature sensor 41-1 to meet the L-th test temperature value, and testing the first corrosion test box 40 and the second corrosion test box 41 to obtain the average corrosion rate of the ith coupon assembly in the first corrosion test box 40 when tested for K times at the L-th test temperature value and the average corrosion rate of the ith coupon assembly in the second corrosion test box 41 when tested for K times at the L-th test temperature value; wherein L and L are positive integers, and L is more than or equal to 1 and less than or equal to L;
step six, obtaining the maximum corrosion rate:
step 601, testing time t k The average corrosion rate is used as the ordinate to obtain the average corrosion rate time-varying curve of the ith coupon assembly in the first corrosion test box 40 at each test temperature value, and the first corrosion rate time-varying curve of the ith coupon assembly in the first corrosion test box 40 at each test temperature value is obtainedThe maximum corrosion rate of the ith coupon assembly in the corrosion test box 40;
step 602, test the time t k And taking the average corrosion rate as a vertical coordinate to obtain an average corrosion rate time-varying curve of the ith coupon assembly in the second corrosion test box 41 at each test temperature value, and obtaining the maximum corrosion rate of the ith coupon assembly in the second corrosion test box 41 from the average corrosion rate time-varying curve of the ith coupon assembly in the second corrosion test box 41 at each test temperature value.
As shown in fig. 8, in the present embodiment, in step three, a seawater tank 42 is connected to a shell-and-tube condenser 45, a first plate heat exchanger 43 and a second plate heat exchanger 44, and the shell-and-tube condenser 45 is connected to an evaporation concentrator 46, and the evaporation concentrator 46 supplies steam to the first corrosion test tank 40 and the second corrosion test tank 41; the first buffer water tank 47 provides seawater for the first corrosion test tank 40, and the second buffer water tank 48 provides seawater for the second corrosion test tank 41, and the specific process is as follows:
301, connecting a seawater water tank 42 with input ports of a first seawater cooling pump 42-1 and a second seawater cooling pump 42-2, connecting an output port of the first seawater cooling pump 42-1 with a cold end inlet of a first plate heat exchanger 43 through a first pipeline, connecting an output port of the first seawater cooling pump 42-1 with a cold end inlet of a second plate heat exchanger 44 through a second pipeline, and connecting an output port of the second seawater cooling pump 42-2 with a cold end inlet of a shell-and-tube condenser 45 through a third pipeline;
the cold end outlet of the first plate heat exchanger 43, the cold end outlet of the second plate heat exchanger 44 and the cold end outlet of the shell-and-tube condenser 45 are connected with a circulating seawater tank 49 through seawater pipelines;
step 302, connecting a first buffer water tank 47 with an input port of a first seawater circulating pump 47-1 through a first water tank pipeline, connecting an output port of the first seawater circulating pump 47-1 with a first conveying pipeline, and connecting the first conveying pipeline with a ferrule type joint 8 in the first corrosion test box 40;
connecting a second buffer water tank 48 with an input port of a second seawater circulating pump 48-1 through a second water tank pipeline, connecting an output port of the second seawater circulating pump 48-1 with a second conveying pipeline, and connecting the second conveying pipeline with a ferrule type joint 8 in the second corrosion test box 41;
the circulating seawater tank 49 is connected with an input port of a third seawater circulating pump 49-1 through a third tank pipeline, an output port of the third seawater circulating pump 49-1 is connected with a third conveying pipeline, and the third conveying pipeline is connected with the evaporation concentrator 46;
step 303, connecting a hot end outlet of the evaporation concentrator 46 with a first steam pipeline, a second steam pipeline and a third steam pipeline, wherein the first steam pipeline and the steam in the first corrosion test box 40 enter the joint 11, the second steam pipeline and the steam in the second corrosion test box 41 enter the joint 11, and the third steam pipeline is connected with a hot end inlet of the shell-and-tube condenser 45;
step 304, connecting a steam outlet joint 12 in the first corrosion test box 40 with a first steam output pipeline, connecting a steam outlet joint 12 in the second corrosion test box 41 with a second steam output pipeline, connecting the first steam output pipeline with a hot end inlet of the first plate heat exchanger 43, and connecting the second steam output pipeline with a hot end inlet of the second plate heat exchanger 44;
the hot end outlet of the first plate heat exchanger 43 is connected with a first fresh water buffer water tank 51 through a first fresh water pipeline, the hot end outlet of the second plate heat exchanger 44 is connected with a second fresh water buffer water tank 52 through a second fresh water pipeline, and the hot end outlet of the shell-and-tube condenser 45 is connected with a fresh water tank 50 through a third fresh water pipeline, the first fresh water buffer water tank 51 through a fourth fresh water pipeline and the second fresh water buffer water tank 52 through a fifth fresh water pipeline;
305, connecting the seawater outlet joint 24 in the first corrosion test box 40 with a first buffer water tank 47 through a first circulating pipeline; the seawater outlet joint 24 in the second corrosion test tank 41 is connected with a second buffer water tank 48 through a second circulating pipeline;
and step 306, connecting the first buffer water tank 47 with a first discharge pipeline 47-3, connecting the second buffer water tank 48 with a second discharge pipeline 48-3, connecting the circulating sea water tank 49 with a third discharge pipeline 49-3, and connecting the first discharge pipeline 47-3, the second discharge pipeline 48-3 and the third discharge pipeline 49-3 with the sea water tank 42 through a circulating main pipeline 42-4.
In the embodiment, the test box body comprises a bottom plate 1, a cover plate 13 and four vertical side plates 9 connected between the bottom plate 1 and the cover plate 13, and the interior of the test box body is of a hollow structure;
be provided with steam access joint 11 and steam on the apron 13 and go out to connect 12, the entry that steam access joint 11 connects is steam inlet, the export that steam goes out to connect 12 is steam outlet, be provided with sea water on the bottom plate 1 and go out to connect 24, the export that sea water goes out to connect 24 is sea water export, be provided with cutting ferrule formula on the vertical curb plate 9 and connect 8, the import that cutting ferrule formula connects 8 is the sea water import.
In this embodiment, the spraying mechanism includes a spraying pipe 15 communicated with the ferrule type joint 8, a nozzle base 18 installed on the spraying pipe 15, and a nozzle 19 installed on the nozzle base 18, the spraying pipe 15 is horizontally arranged, an outlet of the nozzle 19 faces downward vertically, a supporting pipe 17 is arranged on the inner side wall of the test box body, one end of the spraying pipe 15 far away from the ferrule type joint 8 extends into the supporting pipe 17, and an end cover 16 is installed at one end of the spraying pipe 15 far away from the ferrule type joint 8.
In the embodiment, as shown in fig. 3 and 4, the wire mesh demister mechanism 10 comprises two rib plates 10-1 symmetrically arranged on the inner side wall of the test box body, a support plate 10-2 arranged on the two rib plates 10-1, a grid plate 10-3 arranged on the support plate 10-2 and a wire mesh 10-5 arranged on the grid plate 10-3, wherein a plurality of briquettes 10-4 are arranged on the wire mesh 10-5, and a plurality of briquettes 10-4 are arranged along the peripheral top surface of the wire mesh 10-5.
In this embodiment, a first installation interface 25, a second installation interface 28, and a third installation interface 31 are arranged on the test box body from top to bottom, the first installation interface 25, the second installation interface 28, and the third installation interface 31 have the same structure, the first installation interface 25, the second installation interface 28, and the third installation interface 31 each include a connection pipe 3-1 communicated with the test box body, a flange 3 installed at an end of the connection pipe 3-1, and a flange cover 4 connected with the flange 3, and a sealing gasket 5 is arranged between the flange 3 and the flange cover 4.
As shown in fig. 5, 6, and 7, in this embodiment, the first hanger assembly, the second hanger assembly, and the third hanger assembly are the same, and the first hanger assembly, the second hanger assembly, and the third hanger assembly each include a rail 14-3 installed on an inner side wall of the test box body, a slide rail frame 14-2 installed on the rail 14-3, a support rib plate 14-1 installed in the slide rail frame 14-2, and multiple groups of hanger groups installed on the support rib plate 14-1, multiple mounting holes 14-7 are formed in the support rib plate 14-1, multiple mounting holes 14-7 are arranged along a length direction of the support rib plate 14-1, a stud 14-5 penetrates through the mounting holes 14-7, each group of hanger groups includes two test pieces 14-6 symmetrically sleeved on the stud 14-5, nuts 14-4 are installed at two ends of the stud 14-5, and the test piece 14-6 is located between the support rib plate 14-1 and the nuts 14-4.
In this embodiment, in the fifth step, the units of K =6,K test times are all days, and then the first test time t is the first test time t 1 =30, second test time t 2 =90, third test time t 3 =150, fourth test time t 4 =210, fifth test time t 5 =270, sixth test time t 6 ＝300；
The first test temperature value in the fifth step is marked as T l And the l-1 test temperature value is denoted as T l-1 ，T l ＝T l-1 +2 ℃ and the 1 st test temperature value T 1 =50 ℃, L-th test temperature value T L ＝78℃。
In this embodiment, the maximum etching rate in the sixth step is obtained, and then the following steps are performed:
step A, recording the maximum corrosion rate of the 1 st coupon assembly in a first corrosion test box 40 as the maximum corrosion rate of a first gas phase coupon, recording the maximum corrosion rate of the 2 nd coupon assembly as the maximum corrosion rate of a first gas-liquid phase coupon, and recording the maximum corrosion rate of the 3 rd coupon assembly as the maximum corrosion rate of a first liquid phase coupon;
step B, recording the maximum corrosion rate of the 1 st coupon assembly in the second corrosion test box 41 as the maximum corrosion rate of the second gas-liquid phase coupon, recording the maximum corrosion rate of the 2 nd coupon assembly as the maximum corrosion rate of the second gas-liquid phase coupon, and recording the maximum corrosion rate of the 3 rd coupon assembly as the maximum corrosion rate of the second liquid phase coupon;
and step C, respectively obtaining a larger value of the maximum corrosion rate of the liquid-phase hanging piece, a larger value of the maximum corrosion rate of the gas-liquid-phase hanging piece and a larger value of the maximum corrosion rate of the gas-liquid-phase hanging piece according to the maximum corrosion rate of the first liquid-phase hanging piece and the maximum corrosion rate of the second liquid-phase hanging piece, the maximum corrosion rate of the first gas-liquid-phase hanging piece and the maximum corrosion rate of the second gas-phase hanging piece.
In this embodiment, the test box body is provided with a liquid level meter interface 26, a middle test piece sampling port 27 and a lower test piece sampling port 29, and the number of the liquid level meter interface 26, the number of the middle test piece sampling port 27 and the number of the lower test piece sampling ports 29 are two.
In this embodiment, the four vertical side plates 9 are a front vertical side plate, a rear vertical side plate, a left vertical side plate, and a right vertical side plate, respectively.
In this embodiment, the two liquid level meter interfaces 26 are arranged along the height direction of the front vertical side plate, and the two liquid level meter interfaces 26 are provided with magnetic turning plate liquid level meters to realize the detection of the liquid level in the test box.
In this embodiment, in practical use, the first mounting port 25 and the second mounting port 28 are located on the right vertical side plate, and the third mounting port 31 is located on the left vertical side plate; the middle test piece sampling port 27 and the third mounting port 31 are located on the same side wall of the test box, and the lower test piece sampling port 29 and the first and second mounting ports 25 and 28 are located on the same side wall of the test box.
In this embodiment, the number of the middle specimen sampling ports 27 and the number of the lower specimen sampling ports 29 are both two. The two middle specimen sampling openings 27 are arranged symmetrically with respect to the second mounting opening 28, and the two lower specimen sampling openings 29 are arranged symmetrically with respect to the third mounting opening 31.
In this embodiment, during actual testing, the middle test piece sampling port 27 and the lower test piece sampling port 29 are respectively provided with a first flange blind plate and a second flange blind plate.
In the embodiment, the stud bolts 14-5 are PTFE polytetrafluoroethylene bolts, and the nuts 14-4 are PTFE polytetrafluoroethylene nuts, so that the condition that the test piece is hung without intermetallic corrosion influence is avoided.
In this embodiment, the supporting plate 10-2 is a hollow return plate in practical use.
In this embodiment, the supporting tube 17 is provided to extend the end of the spraying tube 15 far away from the ferrule type joint 8 into the supporting tube 17, so as to limit the end of the spraying tube 15 and facilitate the installation of the spraying tube 15.
In this embodiment, the spray pipe 15 and the nozzle 19 are arranged so that seawater in the spray pipe 15 is sprayed to the second coupon assembly through the nozzle 19, and the second coupon assembly is in a gas-liquid phase environment, so that the coupon material coupon can be independently and stably exposed in the gas-liquid environment.
In this embodiment, the bottom of test box is filled with the sea water, third lacing film subassembly is in the sea water, realizes that third lacing film subassembly is in the liquid phase environment, makes the stable exposure of test piece material lacing film ability independent in the liquid phase environment.
In this embodiment, the screen 10-5 is provided to remove entrained mist by passing steam through the screen 10-5 of the demister, thereby improving the accuracy of the gas phase environment.
In the embodiment, the grid plate 10-3 and the pressing block 10-4 improve the stability of the silk screen 10-5 and avoid the deviation of the silk screen 10-5 caused by large steam pressure.
In this embodiment, the first mounting interface 25, the second mounting interface 28, and the third mounting interface 31 are provided to facilitate mounting of the first hanging piece assembly, the second hanging piece assembly, and the third hanging piece assembly, so that the first hanging piece assembly is in a gas phase environment, the second hanging piece assembly is in a gas-liquid phase environment, and the third hanging piece assembly is in a liquid phase environment.
In this embodiment, the first mounting interface 25, the second mounting interface 28, and the third mounting interface 31 each include a connection pipe 3-1, a flange 3, and a flange cover 4, and the connection pipe 3-1 is provided to facilitate the mounting of the flange 3, so that the first hanging piece assembly, the second hanging piece assembly, and the third hanging piece assembly can be conveniently mounted and then hermetically connected to the flange cover 4 and the flange 3, thereby improving the sealing effect of the test box. In addition, the L-shaped plate 14-3-1 in the rail 14-3 is fixedly arranged near the end part of the mounting interface.
In this embodiment, the two rib plates 10-1 are respectively installed on the inner side walls of the left vertical side plate and the right vertical side plate, and the support pipe 17 is installed on the inner side wall of the right vertical side plate.
In this embodiment, the number of the pressing blocks 10-4 is four, and the four pressing blocks 10-4 are connected with the vertical side plate 9 near the side wall of the vertical side plate 9.
Two viewing mirror ports 20 are arranged on the front vertical side plate and the rear vertical side plate of the test box body.
In this embodiment, the first mounting interface 25, the second mounting interface 28 and the third mounting interface 31 are circular interfaces in cross section.
In the embodiment, the sliding rail frame 14-2 and the track 14-3 are matched, firstly, the sliding rail frame 14-2 slides along the track 14-3 through the limit of the track 14-3, so that the sliding rail frame 14-2 and a plurality of test pieces 14-6 on the sliding rail frame 14-2 are taken out of the test box body or are installed in the test box body, and the installation is convenient and fast; secondly, the other end of the rail 14-3 positions the mounting position of the sliding rail frame 14-2, so that one end, far away from the mounting interface, of the sliding rail frame 14-2 is attached to the end part of the rail 14-3, and the first hanging piece assembly, the second hanging piece assembly and the third hanging piece assembly are mounted in place; thirdly, in the process of introducing steam and seawater, the sliding rail frame 14-2 is limited through the rail 14-3, so that the installation stability of the first hanging piece assembly, the second hanging piece assembly and the third hanging piece assembly is improved.
In the embodiment, a plurality of stud bolts 14-5 are arranged, and test pieces 14-6 are sleeved at two ends of the stud bolts 14-5, firstly, in order to increase the installation number of the test pieces 14-6, corrosion of each position of the seawater desalination equipment is reflected through more test pieces 14-6; secondly, the area of the corroded area inside the seawater desalination equipment is effectively simulated, because the corroded area inside the seawater desalination equipment is simulated to be larger; thirdly, the test piece 14-6 is hung so that each surface of the test piece 14-6 is corroded.
In the embodiment, nuts 14-4 are mounted at two ends of the stud bolt 14-5, the test piece 14-6 is located between the support rib plate 14-1 and the nuts 14-4, the nuts 14-4 are arranged to prevent the test piece 14-6 from slipping off the stud bolt 14-5, and the test piece 14-6 is located between the support rib plate 14-1 and the nuts 14-4, so that gaps are arranged between the test piece 14-6 and the support rib plate 14-1 and between the test piece 14-6 and the nuts 14-4, and therefore the test piece 14-6 and the nuts 14-4 are prevented from influencing the corrosion test of the test piece 14-6.
In this embodiment, the rail 14-3 includes two L-shaped plates 14-3-1 symmetrically arranged in parallel and a connecting plate 14-3-2 connected between the two L-shaped plates 14-3-1, an outer side surface of the connecting plate 14-3-2 is connected with an inner side wall of the vertical side plate 9, a distance between the two L-shaped plates 14-3-1 is smaller than a distance between the front vertical side plate and the rear vertical side plate, and one end of the L-shaped plate 14-3-1, which is close to the first mounting interface 25, the second mounting interface 28 and the third mounting interface 31, extends into the connecting pipe 3-1 and is connected with the inner side wall of the connecting pipe 3-1.
In this embodiment, an accommodating groove installed at one end of the sliding rail frame 14-2 is formed in the connecting plate 14-3-2, and the other end of the sliding rail frame 14-2 extends out of the L-shaped plate 14-3-1 and extends into the connecting pipe 3-1.
In the embodiment, an L-shaped plate 14-3-1 and a connecting plate 14-3-2 are arranged, firstly, the vertical part of the L-shaped plate 14-3-1 is welded with the inner side wall of a connecting pipe 3-1, and the outer side wall of the connecting plate 14-3-2 is welded with the inner side wall of a vertical side plate 9, so that the L-shaped plate 14-3-1 is fixed; secondly, in order to place the sliding rail frame 14-2 on the horizontal part of the L-shaped plate 14-3-1, the vertical part of the L-shaped plate 14-3-1 is used for limiting, so that the sliding rail frame 14-2 can slide conveniently; in addition, the limit of the installation position of the sliding rail frame 14-2 is realized through the connecting plate 14-3-2; and secondly, the slide rail frame 14-2 is fixed through the fixing of the L-shaped plate 14-3-1, so that the test piece 14-6 is stably installed.
In the embodiment, the support rib plates 14-1 are arranged and the support rib plates 14-1 are arranged along the length direction of the slide rail frame 14-2, so that the arrangement of the slide rail frame 14-2 and the plurality of stud bolts 14-5 along the length direction of the test box body is convenient for the plurality of stud bolts 14-5, and the arrangement of the stud bolts 14-5 along the length direction of the test box body is realized.
In the embodiment, the supporting rib plates 14-1 are vertically arranged, and the tops of the supporting rib plates 14-1 are higher than the tops of the L-shaped plates 14-3-1.
In this embodiment, the seawater tank 42 is provided with a seawater inlet pipe 42-3,
in this embodiment, the first buffer water tank 47 is provided with a first heater 47-2, the second buffer water tank 48 is provided with a second heater 48-2, and the circulating sea water tank 49 is provided with a third heater 49-2.
In this embodiment, the fresh water tank 50 is provided with a fresh water pump 50-1, the fresh water pump 50-1 is connected to the first buffer water tank 47 through a first connecting pipeline, and the fresh water pump 50-1 is connected to the second buffer water tank 48 through a second connecting pipeline, so that fresh water can be supplemented conveniently, and a large change in seawater concentration can be avoided.
In this embodiment, a valve 49-4 is provided in the third discharge line 49-3.
In this embodiment, the first heater 47-2 is arranged to heat the seawater in the first buffer water tank 47, so that the temperature of the seawater entering the first corrosion test tank satisfies L test temperature values; a second heater 48-2 is provided to heat the seawater in the second buffer tank 48 so that the temperature of the seawater entering the second corrosion test tank satisfies L test temperature values.
In this embodiment, a third heater 49-2 is provided to heat the seawater in the circulating seawater tank 49, so that the temperature of the seawater entering the evaporation concentrator 46 meets the evaporation requirement, and the steam temperature output by the evaporation concentrator 46 also meets L test temperature values.
In this example, the initial mass m of the test pieces 14 to 6 0 And a firstThe quality of the jth test piece 14-6 in the i hanging piece assemblies after the first test
Figure BDA0002846205470000241
In g, the surface area s of the test piece 14-6 is in cm 2 The unit of the density rho of the test piece 14-6 is g/cm 3 。
In summary, the seawater desalination corrosion test method of the present invention firstly installs the coupon assembly in the first corrosion test box, then installs the coupon assembly in the second corrosion test box, then connects the seawater desalination corrosion test device, then tests the coupon assembly to obtain the corrosion rate, and finally obtains the maximum corrosion rate of the coupon assembly in the gas phase environment, the gas-liquid phase environment and the liquid phase environment in the corrosion test box, so as to realize the test of the corrosion rate of the test piece in the gas phase environment, the gas-liquid phase environment and the liquid phase environment. The corrosion rate of the test piece in a gas phase environment, a gas-liquid phase environment and a liquid phase environment is tested, so that the corrosion behavior of the test piece material is conveniently and deeply researched, and a basis is further provided for selection of materials used by the seawater desalination equipment.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims (7)

1. A seawater desalination corrosion test method is characterized in that the adopted device comprises a test box body, a silk screen demister mechanism (10) and a spraying mechanism, wherein the silk screen demister mechanism (10) is arranged at the top in the test box body, the silk screen demister mechanism (10) is higher than the spraying mechanism, a first hanging piece assembly, a second hanging piece assembly and a third hanging piece assembly are sequentially arranged in the test box body from top to bottom, the first hanging piece assembly is positioned between the silk screen demister mechanism (10) and the spraying mechanism, the third hanging piece assembly is positioned at the bottom of the test box body, the second hanging piece assembly is positioned between the spraying mechanism and the third hanging piece assembly, the spraying mechanism is higher than the second hanging piece assembly and the third hanging piece assembly, the first hanging piece assembly, the second hanging piece assembly and the third hanging piece assembly are detachably connected with the test box body, the first hanging piece assembly, the second hanging piece assembly and the third hanging piece assembly respectively comprise a plurality of test pieces (14-6), the third hanging piece assembly is filled in seawater, and the seawater desalination corrosion test method comprises the following steps:
step one, installing a hanging piece assembly in a first corrosion test box:
step 101, inserting stud bolts (14-5) into mounting holes (14-7) on a support rib plate (14-1), sleeving two symmetrically-distributed test pieces (14-6) on each stud bolt (14-5), and mounting nuts (14-4) at two ends of each stud bolt (14-5); the number of the stud bolts (14-5) is multiple, and the stud bolts (14-5) are distributed along the length direction of the support rib plate (14-1);
102, inserting a slide rail frame (14-2) provided with a test piece (14-6) through a first mounting interface (25), and placing the slide rail frame on a track (14-3) on the inner side wall of the test box body in a sliding manner until one end, far away from the first mounting interface (25), of the slide rail frame (14-2) is attached to the end part of the track (14-3), so as to finish mounting of a first hanging piece assembly;
103, inserting the slide rail frame (14-2) with the test piece (14-6) installed through the second installation interface (28) according to the method in the step 101 and the step 102 until one end, far away from the second installation interface (28), of the slide rail frame (14-2) is attached to the end of the rail (14-3), and completing installation of the second hanging piece assembly;
step 104, inserting the slide rail frame (14-2) with the test piece (14-6) installed through the third installation interface (31) according to the method in the steps 101 and 102 until one end, far away from the third installation interface (31), of the slide rail frame (14-2) is attached to the end of the rail (14-3), and completing installation of the third hanging piece assembly;
step 105, respectively installing a first flange blind plate and a second flange blind plate on the middle test piece sampling port (27) and the lower test piece sampling port (29);
step 106, installing flange covers (4) at the first installation interface (25), the second installation interface (28) and the third installation interface (31) respectively; a sealing gasket (5) is arranged between the flange (3) and the flange cover (4), and the mounting of the hanging piece assembly in the first corrosion test box is completed to obtain a first corrosion test box (40);
step two, mounting the hanging piece assembly in a second corrosion test box:
according to the method of the step one, completing the installation of the hanging piece assembly in the second corrosion test box to obtain a second corrosion test box (41);
step three, connecting the seawater desalination corrosion testing device:
connecting a seawater water tank (42) with a shell-and-tube condenser (45), a first plate heat exchanger (43) and a second plate heat exchanger (44), and connecting the shell-and-tube condenser (45) with an evaporation concentrator (46), wherein the evaporation concentrator (46) provides steam for a first corrosion test box (40) and a second corrosion test box (41);
the first buffer water tank (47) provides seawater for the first corrosion test tank (40), and the second buffer water tank (48) provides seawater for the second corrosion test tank (41);
step four, testing the hanging piece assembly:
step 401, operating the evaporation concentrator (46) to work, and enabling steam output from a hot end outlet of the evaporation concentrator (46) to enter a first corrosion test box (40) through a first steam pipeline and a steam inlet joint (11);
steam output from a hot end outlet of the evaporation concentrator (46) enters a second corrosion test box (41) through a second steam pipeline and a steam inlet joint (11);
step 402, operating a first seawater circulating pump (47-1) and a second seawater circulating pump (48-1) to work, and conveying seawater in a first buffer water tank (47) to a cutting sleeve type joint (8) in the first corrosion test tank (40) through a first water tank pipeline, the first seawater circulating pump (47-1) and a first conveying pipeline;
conveying the seawater in the second buffer water tank (48) to a ferrule type joint (8) in the second corrosion test tank (41) through a second water tank pipeline, a second seawater circulating pump (48-1) and a second conveying pipeline;
step 403, spraying seawater in the spray pipe (15) in the first corrosion test box (40) through the spray nozzle (19), and spraying seawater in the spray pipe (15) in the second corrosion test box (41) through the spray nozzle (19);
404, in the process of introducing steam and seawater into the first corrosion test box (40), detecting a first pressure in the first corrosion test box (40) by a first pressure sensor (40-2) on the first corrosion test box (40) so as to enable the first pressure in the first corrosion test box (40) to meet a first pressure set value; wherein the first pressure set value is 12 kPa-15 kPa;
in the process of introducing steam and seawater into the second corrosion test box (41), a second pressure sensor (41-2) on the second corrosion test box (41) detects second pressure in the second corrosion test box (41) so that the second pressure in the second corrosion test box (41) meets a second pressure set value; wherein the second pressure set value is 20 kPa-30 kPa;
step five, obtaining the corrosion rate:
step 501, in the process of introducing steam and seawater into the first corrosion test box (40), detecting a first temperature in the first corrosion test box (40) by a first temperature sensor (40-1) on the first corrosion test box (40), in the process of introducing steam and seawater into the second corrosion test box (41), detecting a second temperature in the second corrosion test box (41) by a second temperature sensor (41-1) on the second corrosion test box (41), wherein the first temperature detected by the first temperature sensor (40-1) and the second temperature detected by the second temperature sensor (41-1) both meet a 1 st test temperature value, and testing the first corrosion test box (40) and the second corrosion test box (41), specifically, the process is as follows:
step 5011, in the process of introducing steam and seawater into the first corrosion test box (40) and the second corrosion test box (41), waiting for a first test time t 1 Then, respectively taking out the first coupon assembly, the second coupon assembly and the third coupon assembly from the first corrosion test box (40) and the second corrosion test box (41);
step 5012, according to the formula
Figure FDA0003971844310000041
Obtaining the corrosion rate of a jth test piece (14-6) in an ith coupon assembly in a first corrosion test box (40) at a 1 st test temperature value during a first test; wherein i and j are positive integers, i is more than or equal to 1 and less than or equal to 3,N represents the number of test pieces (14-6) in the first hanging piece assembly, the second hanging piece assembly and the third hanging piece assembly, j is more than or equal to 1 and less than or equal to N, m 0 Represents the initial mass of the test piece (14-6), s represents the surface area of the test piece (14-6), p represents the density of the test piece (14-6), and/or>
Figure FDA0003971844310000042
Representing the quality of a jth test piece (14-6) in an ith coupon assembly in a first corrosion test box (40) after the first test;
step 5013, according to the formula
Figure FDA0003971844310000043
Obtaining the average corrosion rate of the ith coupon assembly in the first corrosion test box (40) at the 1 st test temperature value during the first test;
step 5014, according to the formula
Figure FDA0003971844310000044
Obtaining the corrosion rate of a jth test piece (14-6) in an ith coupon assembly in a second corrosion test box (41) at a 1 st test temperature value during a first test; wherein it is present>
Figure FDA0003971844310000045
The quality of a jth test piece (14-6) in an ith coupon assembly in a second corrosion test box (41) after the first test is represented;
step 5015, according to the formula
Figure FDA0003971844310000046
Obtaining the average corrosion rate of the ith coupon assembly in the second corrosion test box (41) at the 1 st test temperature value during the first test;
step 5016, according to steps 5011 to 5015The method comprises the step of testing the first corrosion test box (40) and the second corrosion test box (41) for the kth time until the kth test time t is reached k Then, obtaining the average corrosion rate of the ith coupon assembly in the first corrosion test box (40) at the 1 st test temperature value during the kth test and the average corrosion rate of the ith coupon assembly in the second corrosion test box (41) at the 1 st test temperature value during the kth test;
step 5017, repeating the steps 5011 to 5015K times, and performing the Kth test on the first corrosion test box (40) and the second corrosion test box (41) until the Kth test time t is reached K Then, obtaining the average corrosion rate of the ith coupon assembly in the first corrosion test box (40) at the 1 st test temperature value during the Kth test and the average corrosion rate of the ith coupon assembly in the second corrosion test box (41) at the 1 st test temperature value during the Kth test; wherein K and K are positive integers, K is more than or equal to 1 and less than or equal to K, and K represents the total times of the test;
502, according to the method of 501, testing a first corrosion test box (40) and a second corrosion test box (41) to obtain an average corrosion rate of an ith coupon assembly in the first corrosion test box (40) at an l test temperature value when K times of tests are carried out on the ith coupon assembly in the first corrosion test box (40) and an average corrosion rate of an ith coupon assembly in the second corrosion test box (41) at the l test temperature value when K times of tests are carried out on the ith coupon assembly in the first corrosion test box (40) and the second temperature detected by a second temperature sensor (41-1) both meeting the l test temperature value;
step 503, repeating step 501 for L times to enable both a first temperature detected by the first temperature sensor (40-1) and a second temperature detected by the second temperature sensor (41-1) to meet an L-th test temperature value, testing the first corrosion test box (40) and the second corrosion test box (41) to obtain an average corrosion rate of the ith coupon assembly in the first corrosion test box (40) at the L-th test temperature value during K times of tests and an average corrosion rate of the ith coupon assembly in the second corrosion test box (41) at the L-th test temperature value during K times of tests; wherein L and L are positive integers, and L is more than or equal to 1 and less than or equal to L;
step six, obtaining the maximum corrosion rate:
step (ii) of601. At test time t k The average corrosion rate is used as a vertical coordinate, an average corrosion rate is used as a horizontal coordinate, a time-varying curve of the average corrosion rate of the ith coupon component in the first corrosion test box (40) at each test temperature value is obtained, and the maximum corrosion rate of the ith coupon component in the first corrosion test box (40) is obtained from the time-varying curve of the average corrosion rate of the ith coupon component in the first corrosion test box (40) at each test temperature value;
step 602, test the time t k And taking the average corrosion rate as a vertical coordinate to obtain an average corrosion rate time-varying curve of the ith coupon assembly in the second corrosion test box (41) at each test temperature value, and obtaining the maximum corrosion rate of the ith coupon assembly in the second corrosion test box (41) from the average corrosion rate time-varying curve of the ith coupon assembly in the second corrosion test box (41) at each test temperature value.
2. The seawater desalination corrosion test method according to claim 1, characterized in that: in the third step, a seawater tank (42) is connected with a shell-and-tube condenser (45), a first plate heat exchanger (43) and a second plate heat exchanger (44), the shell-and-tube condenser (45) is connected with an evaporation concentrator (46), and the evaporation concentrator (46) provides steam for a first corrosion test box (40) and a second corrosion test box (41); the first buffer water tank (47) provides seawater for the first corrosion test tank (40), and the second buffer water tank (48) provides seawater for the second corrosion test tank (41), and the specific process is as follows:
step 301, a seawater tank (42) is connected with input ports of a first seawater cooling pump (42-1) and a second seawater cooling pump (42-2), an output port of the first seawater cooling pump (42-1) is connected with a cold end inlet of a first plate heat exchanger (43) through a first pipeline, an output port of the first seawater cooling pump (42-1) is connected with a cold end inlet of a second plate heat exchanger (44) through a second pipeline, and an output port of the second seawater cooling pump (42-2) is connected with a cold end inlet of a shell-and-tube condenser (45) through a third pipeline;
a cold end outlet of the first plate heat exchanger (43), a cold end outlet of the second plate heat exchanger (44) and a cold end outlet of the shell-and-tube condenser (45) are connected with a circulating sea water tank (49) through a sea water pipeline;
step 302, connecting a first buffer water tank (47) with an input port of a first seawater circulating pump (47-1) through a first water tank pipeline, connecting an output port of the first seawater circulating pump (47-1) with a first conveying pipeline, and connecting the first conveying pipeline with a ferrule type joint (8) in the first corrosion test box (40);
connecting a second buffer water tank (48) with an input port of a second seawater circulating pump (48-1) through a second water tank pipeline, connecting an output port of the second seawater circulating pump (48-1) with a second conveying pipeline, and connecting the second conveying pipeline with a ferrule type joint (8) in a second corrosion test box (41);
the circulating sea water tank (49) is connected with an input port of a third sea water circulating pump (49-1) through a third water tank pipeline, an output port of the third sea water circulating pump (49-1) is connected with a third conveying pipeline, and the third conveying pipeline is connected with the evaporation concentrator (46);
step 303, connecting a hot end outlet of the evaporation concentrator (46) with a first steam pipeline, a second steam pipeline and a third steam pipeline, wherein the first steam pipeline is connected with a steam inlet joint (11) in a first corrosion test box (40), the second steam pipeline is connected with a steam inlet joint (11) in a second corrosion test box (41), and the third steam pipeline is connected with a hot end inlet of a shell-and-tube condenser (45);
step 304, connecting a steam outlet joint (12) in the first corrosion test box (40) with a first steam output pipeline, connecting a steam outlet joint (12) in the second corrosion test box (41) with a second steam output pipeline, connecting the first steam output pipeline with a hot end inlet of the first plate heat exchanger (43), and connecting the second steam output pipeline with a hot end inlet of the second plate heat exchanger (44);
the hot end outlet of the first plate heat exchanger (43) is connected with a first fresh water buffer water tank (51) through a first fresh water pipeline, the hot end outlet of the second plate heat exchanger (44) is connected with a second fresh water buffer water tank (52) through a second fresh water pipeline, and the hot end outlet of the shell-and-tube condenser (45) is connected with a fresh water tank (50) through a third fresh water pipeline, the first fresh water buffer water tank (51) through a fourth fresh water pipeline and the second fresh water buffer water tank (52) through a fifth fresh water pipeline;
305, connecting a seawater outlet joint (24) in a first corrosion test box (40) with a first buffer water tank (47) through a first circulating pipeline; a seawater outlet joint (24) in the second corrosion test box (41) is connected with a second buffer water tank (48) through a second circulating pipeline;
step 306, connecting a first buffer water tank (47) with a first discharge pipeline (47-3), connecting a second buffer water tank (48) with a second discharge pipeline (48-3), connecting a circulating sea water tank (49) with a third discharge pipeline (49-3), and connecting the first discharge pipeline (47-3), the second discharge pipeline (48-3) and the third discharge pipeline (49-3) with a sea water tank (42) through a circulating main pipeline (42-4);
the spraying mechanism comprises a spraying pipe (15) communicated with the ferrule type joint (8), a nozzle base (18) arranged on the spraying pipe (15) and a nozzle (19) arranged on the nozzle base (18), the spraying pipe (15) is horizontally arranged, an outlet of the nozzle (19) faces downwards vertically, a supporting pipe (17) is arranged on the inner side wall of the test box body, one end, far away from the ferrule type joint (8), of the spraying pipe (15) extends into the supporting pipe (17), and one end, far away from the ferrule type joint (8), of the spraying pipe (15) is provided with an end cover (16);
the first hanging piece assembly, the second hanging piece assembly and the third hanging piece assembly are identical, the first hanging piece assembly, the second hanging piece assembly and the third hanging piece assembly respectively comprise a rail (14-3) installed on the inner side wall of the testing box body, a sliding rail frame (14-2) installed on the rail (14-3), a supporting rib plate (14-1) installed in the sliding rail frame (14-2) and a plurality of hanging piece groups installed on the supporting rib plate (14-1), a plurality of installation holes (14-7) are formed in the supporting rib plate (14-1), the installation holes (14-7) are arranged along the length direction of the supporting rib plate (14-1), a stud bolt (14-5) penetrates through the installation holes (14-7), each hanging piece group comprises two test pieces (14-6) symmetrically sleeved on the stud bolt (14-5), nuts (14-4) are installed at two ends of the stud bolt (14-5), and the test pieces (14-6) are located between the supporting rib plate (14-1) and the nuts (14-4).
3. The seawater desalination corrosion test method according to claim 1, characterized in that: the testing box body comprises a bottom plate (1), a cover plate (13) and four vertical side plates (9) connected between the bottom plate (1) and the cover plate (13), and the testing box body is internally of a hollow structure;
be provided with steam on apron (13) and get into joint (11) and steam and go out joint (12), the entry that steam got into joint (11) is steam inlet, the export that steam goes out joint (12) is steam outlet, be provided with sea water on bottom plate (1) and go out joint (24), the export that sea water goes out joint (24) is sea water export, be provided with cutting ferrule formula joint (8) on vertical curb plate (9), the import that cutting ferrule formula joint (8) is sea water import.
4. The seawater desalination corrosion test method according to claim 1, characterized in that: the wire mesh demister mechanism (10) comprises two rib plates (10-1) symmetrically arranged on the inner side wall of the test box body, a supporting plate (10-2) arranged on the two rib plates (10-1), a grid plate (10-3) arranged on the supporting plate (10-2) and a wire mesh (10-5) arranged on the grid plate (10-3), wherein press blocks (10-4) are arranged on the wire mesh (10-5), the number of the press blocks (10-4) is multiple, and the press blocks (10-4) are distributed along the peripheral top surface of the wire mesh (10-5).
5. The seawater desalination corrosion test method according to claim 1, characterized in that: the test box is provided with a first installation interface (25), a second installation interface (28) and a third installation interface (31) from top to bottom, the first installation interface (25), the second installation interface (28) and the third installation interface (31) are identical in structure, the first installation interface (25), the second installation interface (28) and the third installation interface (31) respectively comprise a connecting pipe (3-1) communicated with the test box, a flange (3) installed at the end part of the connecting pipe (3-1) and a flange cover (4) connected with the flange (3), and a sealing gasket (5) is arranged between the flange (3) and the flange cover (4).
6. According to the followingThe seawater desalination corrosion test method of claim 1, characterized in that: in the fifth step, the units of K =6,K test times are all days, and then the first test time t is 1 =30, second test time t 2 =90, third test time t 3 =150, fourth test time t 4 =210, fifth test time t 5 =270, sixth test time t 6 ＝300；
The first test temperature value in the fifth step is marked as T l And the l-1 test temperature value is denoted as T l-1 ，T l ＝T l-1 +2 ℃ and the 1 st test temperature value T 1 =50 ℃, lth test temperature value T L ＝78℃。
7. The seawater desalination corrosion test method according to claim 1, characterized in that: and step six, acquiring the maximum corrosion rate, and then performing the following steps:
step A, recording the maximum corrosion rate of the 1 st coupon assembly in a first corrosion test box (40) as the maximum corrosion rate of a first gas phase coupon, recording the maximum corrosion rate of the 2 nd coupon assembly as the maximum corrosion rate of a first gas-liquid phase coupon, and recording the maximum corrosion rate of the 3 rd coupon assembly as the maximum corrosion rate of the first liquid phase coupon;
step B, recording the maximum corrosion rate of the 1 st coupon assembly in a second corrosion test box (41) as the maximum corrosion rate of a second gas-liquid phase coupon, recording the maximum corrosion rate of the 2 nd coupon assembly as the maximum corrosion rate of the second gas-liquid phase coupon, and recording the maximum corrosion rate of the 3 rd coupon assembly as the maximum corrosion rate of a second liquid-phase coupon;
and step C, respectively obtaining a larger value of the maximum corrosion rate of the liquid-phase hanging piece, a larger value of the maximum corrosion rate of the gas-liquid-phase hanging piece and a larger value of the maximum corrosion rate of the gas-liquid-phase hanging piece according to the maximum corrosion rate of the first liquid-phase hanging piece and the maximum corrosion rate of the second liquid-phase hanging piece, the maximum corrosion rate of the first gas-liquid-phase hanging piece and the maximum corrosion rate of the second gas-phase hanging piece.
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