Sewage pipeline microbial corrosion simulation device and method

Abstract

The invention relates to a sewage pipeline microbial corrosion simulation device and method, and the sewage pipeline microbial corrosion simulation device comprises a sewage circulation module which comprises a culture device for culturing artificial sewage; the corrosion chamber module comprises a constant-temperature and constant-humidity corrosion chamber in which a test piece to be simulated is placed, the side wall of the corrosion chamber is provided with a first liquid inlet and a first liquid outlet, the first liquid inlet is connected with the incubator through a pipeline and used for conveying artificial sewage, the first liquid outlet is used for backflow of the artificial sewage, and the position 1 / 3-2 / 3 of the height of the test piece to be simulated is flush with the first liquid outlet; the height of the first liquid inlet is lower than that of the first liquid outlet; and the gas production module is connected with the corrosion chamber through a pipeline and is used for conveying H2S gas to the corrosion chamber. Compared with the prior art, the device has the advantages of sewage pipeline reproduction degree, device maintenance simplicity, good simulation effect and the like.

Description

Technical Field

[0001] The invention relates to the technical field of sewage pipe overhead view, and in particular to a sewage pipe microbial corrosion simulation device and method. Background Art

[0002] The sewage pipe environment is rich in hydrogen sulfide gas, which is converted into sulfuric acid under the action of microorganisms, corroding the inner wall of the pipe, increasing the risk of pipe structure failure, and threatening the safety of the city's underground lifeline. Therefore, it is urgent to study the whole process of microbial corrosion of sewage pipes. In actual sewage pipes, this microbial corrosion process usually lasts for several years, which is inconvenient to track and study. Although the laboratory simulation method can shorten the research cycle, it is necessary to develop a simulation device that conforms to the real sewage pipe environment. Many scholars have made extensive attempts on simulation devices, but the current simulation devices are either too small in scale, with a low degree of reproduction of the sewage pipe environment, and the reference of the test data is very limited; or too large in scale, complex maintenance, and difficult for small and medium-sized laboratories to mass produce. Summary of the invention

[0003] The purpose of the present invention is to overcome the defects of the above-mentioned prior art that it is difficult to simultaneously achieve high reproducibility and easy maintainability of the simulation device, and to provide a sewage pipe microbial corrosion simulation device and method that has both sewage pipe reproducibility and easy device maintenance.

[0004] The purpose of the present invention can be achieved by the following technical solutions:

[0005] In one aspect, a sewage pipe microbial corrosion simulation device comprises:

[0006] A sewage circulation module, comprising a culture vessel for culturing artificial sewage;

[0007] A corrosion chamber module, comprising a corrosion chamber with a specimen to be simulated placed therein and with a constant temperature and humidity, wherein a first liquid inlet connected to the incubator pipeline and used for conveying artificial sewage and a first liquid outlet for reflux of artificial sewage are arranged on a side wall of the corrosion chamber, 1 / 3 to 2 / 3 of the height of the specimen to be simulated is flush with the first liquid outlet, and the height of the first liquid inlet is lower than that of the first liquid outlet;

[0008] and a gas production module connected to the corrosion chamber pipeline and conveying H2S gas thereto.

[0009] Furthermore, an overflow bottle for receiving artificial sewage overflowing from the corrosion chamber is arranged between the first liquid outlet of the corrosion chamber and the culture vessel, and is connected to the first liquid outlet and the culture vessel pipeline.

[0010] Furthermore, the outer wall of the artificial sewage in the culture vessel is provided with an interlayer for constant temperature heating.

[0011] Furthermore, the constant temperature heating interlayer is an interlayer with constant temperature water, and its side wall is provided with a second liquid inlet connected to the constant temperature circulating water tank pipeline and used for inputting constant temperature water, and a second liquid outlet connected to the constant temperature circulating water tank pipeline and used for outputting and reflowing constant temperature water.

[0012] Furthermore, the constant temperature circulating water tank is heated by a constant temperature heater, the constant temperature heater is connected to a second temperature sensor, the second temperature sensor is connected to a controller, the second temperature sensor detects the water temperature in the constant temperature circulating water tank and transmits a signal to the controller, and when the detected water temperature is lower than the set temperature, the constant temperature heater is controlled to turn on.

[0013] Furthermore, a stirrer is provided inside the culture vessel, and a sampling port is provided at the top thereof.

[0014] Furthermore, a heater for heating is provided at the upper inner part of the corrosion chamber;

[0015] The side wall of the corrosion chamber is provided with an air inlet nozzle and an air outlet nozzle connected to the drying pipe pipeline, and the pipeline connecting the air outlet nozzle and the drying pipe is provided with a first valve and a first gas pump;

[0016] A second valve and a second gas pump are provided on the pipeline connecting the gas production module and the corrosion chamber.

[0017] Furthermore, the heater is a hot fan.

[0018] Furthermore, water-absorbing silica gel is arranged in the drying tube.

[0019] Furthermore, the heater, the first valve, the first gas pump, the second valve, and the second gas pump are connected to a controller, and the controller is connected to a first temperature sensor, a humidity sensor, and an H2S sensor placed on the inner wall of the corrosion chamber;

[0020] The first temperature sensor detects the temperature in the corrosion chamber and transmits a signal to the controller. When the detected temperature is lower than the set temperature, the controller controls the heater to start, and when the detected temperature is higher than or equal to the set temperature, the controller controls the heater to shut down;

[0021] The humidity sensor detects the humidity in the corrosion chamber and transmits a signal to the controller. When the detected humidity is higher than the set humidity, the controller controls the first valve to open and the first gas pump to start. When the detected humidity is lower than or equal to the set humidity, the controller controls the first valve to close and the first gas pump to stop.

[0022] The H2S sensor detects the H2S concentration in the corrosion chamber and transmits a signal to the controller. When the detected H2S concentration is lower than the set concentration, the controller controls the second valve to open and the second gas pump to start. When the detected H2S concentration is higher than or equal to the set concentration, the controller controls the second valve to close and the second gas pump to stop.

[0023] Furthermore, the controller is connected to a hydrogen sulfide concentration alarm, and when the controller controls the second valve to close and the second gas pump to close, the hydrogen sulfide concentration alarm sounds an alarm.

[0024] Furthermore, the pipeline connecting the drying tube and the gas outlet nozzle of the corrosion chamber is a first air guide pipe, that is, the pipeline where the first valve and the first gas pump are located.

[0025] Furthermore, the pipe connecting the drying pipe and the air inlet nozzle of the corrosion chamber is a second air guide pipe.

[0026] Furthermore, the pipeline where the second valve and the second gas pump are located is a third air guide pipe.

[0027] Furthermore, the H2S measurement range of the H2S sensor is 0 to 1000 ppm.

[0028] Furthermore, the gas production module comprises:

[0029] a first raw material tank and a second raw material tank for storing the acid solution and the alkaline sulfide salt solution, respectively;

[0030] A reactor connected with the first raw material tank and the second raw material tank through pipelines and used for supplying acid solution and alkaline sulfide salt solution for reaction.

[0031] Furthermore, the reactor pipeline is connected to a first exhaust gas processor and a waste liquid collector, and the corrosion chamber pipeline is connected to a second exhaust gas processor.

[0032] Furthermore, the first exhaust gas processor and the second exhaust gas processor are filled with 0.5-2 mol / L zinc acetate solution.

[0033] Furthermore, in order to prevent the H2S in the reactor from overflowing to the outside of the reactor, the reactor is connected to the pipeline by welding, or a sealing rubber plug is provided at the connection, or the two are an integrated structure, or other conventional technical means in the field are adopted.

[0034] Furthermore, the reactor is connected to the waste liquid collector through an inverted U-shaped conduit, and the inner parts of the first raw material tank and the second raw material tank extend to the bottom of the reactor, and the highest point is located at 1 / 3 to 2 / 3 of the height of the reactor.

[0035] Furthermore, a waste liquid outlet is provided on the lower side wall or the bottom of the waste liquid collector and is sealed with a screw cap.

[0036] Furthermore, the culture vessel is a glass reactor with a volume of 0.8 to 1.5 L. The reactor is provided with three openings, including a vertical opening and two inclined openings. The agitator extends into the culture vessel from the vertical opening.

[0037] Furthermore, the constant temperature circulating water tank is a plastic box with a capacity of 10 to 30 L, and is filled with 1 / 3 to 2 / 3 of water.

[0038] Furthermore, a third liquid outlet is provided at the lower part of the side wall of the constant temperature water tank, which is connected to the second liquid inlet of the constant temperature heating interlayer through a pipe; a third liquid inlet is provided at the top or upper part of the side wall of the constant temperature water tank, which is connected to the second liquid outlet of the constant temperature heating interlayer through a pipe.

[0039] Furthermore, the overflow bottle is a glass bottle with a solvent content of 300 to 800 mL, and a screw cap for sealing is provided at the bottle mouth.

[0040] Furthermore, the corrosion chamber is a sealed plastic box, which usually adopts a rectangular structure, with a length of 20 to 50 cm, a width of 20 to 30 cm, a height of 10 to 30 cm, and a volume of 4 to 45L.

[0041] Furthermore, the reactor is a flask with a volume of 200 to 500 mL; the first raw material tank and the second raw material tank are glass bottles with a volume of 5 to 15 L.

[0042] Furthermore, the waste liquid collector is a glass bottle with a volume of 2 to 10 L.

[0043] Furthermore, the first exhaust gas processor and the second exhaust gas processor are respectively composed of a plurality of glass bottles, each of which has a volume of 0.5 to 2 L, and each of which is filled with 3 / 5 to 4 / 5 of zinc acetate solution.

[0044] Furthermore, the mouth of each glass bottle is plugged with a silicone plug and has two right-angle glass tubes passing through it, one of which extends to the bottom of the bottle and has a multi-hole outlet at the bottle port, which is the air inlet pipe; the other extends only to about 1 cm from the bottle mouth and does not extend into the zinc acetate solution, which is the air outlet pipe. The air inlet pipes and air outlet pipes in two adjacent glass bottles are connected by a tube, so that the glass bottles are connected in series, and finally the unconnected air inlet pipe is connected to the reactor through a tube.

[0045] Furthermore, the first raw material tank and the second raw material tank are glass bottles with a volume of 5 to 15 L, a silicone plug is provided at the bottle mouth, and two glass tubes are provided through the silicone plug and inserted into the glass bottle, and one of the glass tubes is connected to the reactor.

[0046] Furthermore, the pipe connecting the third liquid outlet of the constant temperature circulating water tank and the constant temperature heating interlayer is a first liquid guide pipe, and the first liquid guide pipe is provided with a first liquid delivery pump.

[0047] Furthermore, the pipeline connecting the culture vessel and the first liquid inlet of the corrosion chamber is a second liquid guide tube, and the second liquid guide tube is provided with a second liquid delivery pump.

[0048] Furthermore, the pipeline connecting the overflow bottle and the culture vessel is a third liquid conduit, and the third liquid conduit is provided with a third liquid delivery pump.

[0049] Furthermore, the pipeline connecting the first raw material tank and the reactor is a fourth liquid conduit, and a fourth liquid delivery pump is provided on the fourth liquid conduit.

[0050] Furthermore, the pipeline connecting the second raw material tank and the reactor is a fifth liquid conduit, and a fifth liquid delivery pump is provided on the fifth liquid conduit.

[0051] Furthermore, the pipe connecting the overflow bottle and the first liquid outlet of the corrosion chamber is a sixth liquid guide pipe.

[0052] Furthermore, the pipe connecting the reactor and the waste liquid collector is a seventh liquid conduit.

[0053] Furthermore, the conduit connected to the waste liquid outlet of the waste liquid collector is an eighth liquid conduit.

[0054] Furthermore, the pipe connecting the third liquid inlet of the constant temperature circulating water tank and the constant temperature heating interlayer is a ninth liquid guide pipe.

[0055] Furthermore, the pipe connecting the reactor and the first exhaust gas processor is a fourth air duct.

[0056] Furthermore, the pipe connecting the overflow pipe and the second exhaust gas processor is a fifth air duct.

[0057] On the other hand, the present invention also provides a method for simulating microbial corrosion of a sewage pipe, which is implemented by a sewage pipe microbial corrosion simulation device. A specimen to be simulated is placed in the corrosion chamber, artificial sewage cultured in an incubator is input into the corrosion chamber through a first liquid inlet, and artificial sewage exceeding the height of the first liquid outlet is returned to the incubator through the first liquid outlet, so that the artificial sewage in the corrosion chamber is always located at 1 / 3 to 2 / 3 of the height of the specimen to be simulated, and the gas production module transports H2S gas into the corrosion chamber to simulate the microbial corrosion of the sewage pipe.

[0058] Compared with the prior art, the present invention has the following advantages:

[0059] (1) The sewage pipe microbial corrosion simulation device provided by the present invention can be used to simulate the sewage pipe microbial corrosion situation, which can achieve both sewage pipe reproducibility and device maintenance simplicity. It will not result in a low degree of sewage pipe environment reproducibility due to its small scale, and the reference value of the test data will be very limited. It will not result in complex maintenance due to its large scale, and it will not be difficult for small and medium-sized laboratories to mass produce.

[0060] (2) The present invention compresses the volume of the simulation device as much as possible by integrating the corrosion chamber and the environmental factor control module, thereby reproducing the pipeline environment as much as possible under limited space conditions, which is beneficial to the maintenance of the simulation device and achieves the unity of reproducibility and ease of maintainability.

[0061] (3) The present invention separates the control modules of factors such as hydrogen sulfide and places them outside the corrosion chamber, and performs modular processing on them to make them easier to maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Figure 1 This is a schematic diagram of the structure of the sewage pipe microbial corrosion simulation device shown in Example 2.

[0063] Description of the markings in the figure:

[0064] 1-Test piece to be simulated;

[0065] 2-sewage circulation module, 21-cultivator, 211-constant temperature heating interlayer, 2111-second liquid inlet, 2112-second liquid outlet, 22-constant temperature circulation water tank, 221-constant temperature heater, 222-second temperature sensor;

[0066] 3-corrosion chamber module, 31-corrosion chamber, 311-first liquid inlet, 312-first liquid outlet, 313-gas inlet nozzle, 314-gas outlet nozzle, 32-first temperature sensor, 33-humidity sensor, 34-heater, 35-drying tube, 36-first valve, 37-first gas pump, 38-overflow bottle, 39-H2S sensor;

[0067] 4-gas production module, 41-first raw material tank, 42-second raw material tank, 43-reactor, 44-first waste gas processor, 45-waste liquid collector, 451-waste liquid outlet, 46-second waste gas processor, 47-second valve, 48-second gas pump;

[0068] 51 - first catheter, 52 - second catheter, 53 - third catheter, 54 - fourth catheter, 55 - fifth catheter, 56 - sixth catheter, 57 - seventh catheter, 58 - eighth catheter;

[0069] 61-first liquid delivery pump, 62-second liquid delivery pump, 63-third liquid delivery pump, 64-fourth liquid delivery pump, 65-fifth liquid delivery pump;

[0070] 71 - first airway, 72 - second airway, 73 - third airway, 74 - fourth airway, 75 - fifth airway. DETAILED DESCRIPTION

[0071] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments are implemented based on the technical solution of the present invention, and detailed implementation methods and specific operation processes are given, but the protection scope of the present invention is not limited to the following embodiments. In the following embodiments or embodiments, if there is no special description of the functional components or structures, it means that they are all conventional components or conventional structures used in the art to achieve the corresponding functions.

[0072] It should be noted that in the description of the present invention, the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0073] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0074] The following liquid delivery pumps all use peristaltic pumps

[0075] A sewage pipe microbial corrosion simulation device, comprising:

[0076] A sewage circulation module 2, comprising a culture vessel 21 for culturing artificial sewage;

[0077] The corrosion chamber module 3 comprises a corrosion chamber 31 with a specimen 1 to be simulated placed therein and with constant temperature and humidity, the side wall of the corrosion chamber 31 is provided with a first liquid inlet 311 connected to the pipeline of the culture vessel 31 and used for conveying artificial sewage and a first liquid outlet 312 for reflux of artificial sewage, 1 / 3 to 2 / 3 of the height of the specimen 1 to be simulated is flush with the first liquid outlet 311, and the height of the first liquid inlet 311 is lower than that of the first liquid outlet 312;

[0078] And a gas production module 4 connected to the corrosion chamber 31 through a pipeline and conveying H2S gas thereto.

[0079] In some specific embodiments, an overflow bottle 38 for receiving artificial sewage overflowing from the corrosion chamber 31 is arranged between the first liquid outlet 311 of the corrosion chamber 31 and the culture vessel 31, and is connected to the first liquid outlet 311 and the culture vessel 31 through a pipeline.

[0080] In some specific embodiments, the outer wall of the artificial sewage in the culture vessel 21 is provided with an interlayer 211 for constant temperature heating.

[0081] In some specific embodiments, the constant temperature heating interlayer 211 is an interlayer with constant temperature water, and its side wall is provided with a second liquid inlet 2111 connected to the constant temperature circulating water tank 22 pipeline and used for inputting constant temperature water, and a second liquid outlet 2112 connected to the constant temperature circulating water tank 22 pipeline and used for outputting and reflowing constant temperature water.

[0082] In some specific embodiments, the constant temperature circulating water tank 22 is heated by a constant temperature heater 221. The constant temperature circulating water tank 22 is heated by the constant temperature heater 221, the constant temperature heater 221 is connected to a second temperature sensor 222, the second temperature sensor 222 is connected to a controller, the second temperature sensor 222 detects the water temperature in the constant temperature circulating water tank 22, and transmits a signal to the controller, and when the detected water temperature is lower than the set temperature, the constant temperature heater 221 is controlled to turn on.

[0083] In some specific embodiments, the culture vessel 21 is provided with a stirrer inside and a sampling port at the top.

[0084] In some specific embodiments, a heater 34 for heating is provided at the inner upper portion of the corrosion chamber 31;

[0085] The side wall of the corrosion chamber 31 is provided with an air inlet nozzle 313 and an air outlet nozzle 314 connected to the drying pipe 35, and the pipeline connecting the air outlet nozzle 314 and the drying pipe 35 is provided with a first valve 36 and a first gas pump 37;

[0086] A second valve 47 and a second gas pump 48 are provided on the pipeline connecting the gas production module 4 and the corrosion chamber 31 .

[0087] In some specific implementations, the heater 34 is a hot fan.

[0088] In some specific implementations, water-absorbing silica gel is disposed in the drying tube 35 .

[0089] In some specific embodiments, the heater 34, the first valve 36, the first gas pump 37, the second valve 47, and the second gas pump 48 are connected to a controller, and the controller is connected to a first temperature sensor 32, a humidity sensor 33, and an H2S sensor 39 disposed on the inner wall of the corrosion chamber 31;

[0090] The first temperature sensor 32 detects the temperature in the corrosion chamber 31 and transmits a signal to the controller. When the detected temperature is lower than the set temperature, the controller controls the heater 34 to start, and when the detected temperature is higher than or equal to the set temperature, the controller controls the heater 34 to turn off;

[0091] The humidity sensor 33 detects the humidity in the corrosion chamber 31 and transmits a signal to the controller. When the detected humidity is higher than the set humidity, the controller controls the first valve 36 to open and the first gas pump 37 to start. When the detected humidity is lower than or equal to the set humidity, the controller controls the first valve 36 to close and the first gas pump 37 to close.

[0092] The H2S sensor 39 detects the H2S concentration in the corrosion chamber 31 and transmits a signal to the controller. When the detected H2S concentration is lower than the set concentration, the controller controls the second valve 47 to open and the second gas pump 48 to start. When the detected H2S concentration is higher than or equal to the set concentration, the controller controls the second valve 47 to close and the second gas pump 48 to close.

[0093] In some specific implementations, the pipe connecting the drying pipe 35 and the gas outlet nozzle 314 of the corrosion chamber 1 is the first gas guide pipe 71, that is, the pipe where the first valve 36 and the first gas pump 37 are located.

[0094] In some specific embodiments, the pipe connecting the drying pipe 35 and the air inlet nozzle 313 of the corrosion chamber 31 is a second air guide pipe 72.

[0095] In some specific implementations, the pipeline where the second valve 47 and the second gas pump 48 are located is the third air guide pipe 73 .

[0096] In some specific implementations, the H2S measurement range of the H2S sensor 39 is 0 to 1000 ppm.

[0097] In some specific embodiments, the gas production module 4 includes:

[0098] A first raw material tank 41 and a second raw material tank 42 for storing an acid solution and an alkaline sulfide salt solution, respectively;

[0099] A reactor 43 is connected to the first raw material tank 41 and the second raw material tank 42 through pipelines and is used for supplying acid solution and alkaline sulfide salt solution for reaction.

[0100] In some specific embodiments, the reactor 43 is connected to a first exhaust gas processor 44 and a waste liquid collector 45 through a pipeline, and the corrosion chamber 31 is connected to a second exhaust gas processor 46 through a pipeline.

[0101] In some specific embodiments, the first exhaust gas processor 44 and the second exhaust gas processor 46 are filled with 0.5-2 mol / L zinc acetate solution.

[0102] In some specific embodiments, in order to prevent the H2S in the reactor 43 from overflowing to the outside of the reactor 43, the reactor 43 is welded to the pipeline, or a sealing rubber plug is provided at the connection, or the two are an integrated structure, or other conventional technical means in the field are adopted.

[0103] In some specific embodiments, the reactor 43 is connected to the waste liquid collector 45 through an inverted U-shaped conduit, and the inner parts of the first raw material tank 41 and the second raw material tank 42 extend to the bottom of the reactor 43, and the highest point is located at 1 / 3 to 2 / 3 of the height of the reactor 43.

[0104] In some specific embodiments, a waste liquid outlet 451 is provided on the lower side wall or the bottom of the waste liquid collector 45 and is sealed with a screw cap.

[0105] In some specific embodiments, the culture vessel 21 is a glass reactor with a volume of 0.8 to 1.5 L. The reactor is provided with three openings, including a vertical opening and two inclined openings. The agitator extends into the culture vessel 21 from the vertical opening.

[0106] In some specific implementations, the constant temperature circulating water tank 22 is a plastic box with a capacity of 10 to 30 L, and is filled with 1 / 3 to 2 / 3 of water.

[0107] In some specific embodiments, a third liquid outlet is provided at the lower portion of the side wall of the constant temperature water tank 22, which is connected to the second liquid inlet 2111 of the constant temperature heating interlayer 211 through a pipe; a third liquid inlet is provided at the top or upper portion of the side wall of the constant temperature water tank 22, which is connected to the second liquid outlet 2112 of the constant temperature heating interlayer 211 through a pipe.

[0108] In some specific embodiments, the overflow bottle 38 is a glass bottle with a solvent content of 300 to 800 mL, and a screw cap for sealing is provided at the bottle mouth.

[0109] In some specific implementations, the corrosion chamber 31 is a sealed plastic box, which usually adopts a rectangular structure, with a length of 20 to 50 cm, a width of 20 to 30 cm, a height of 10 to 30 cm, and a volume of 4 to 45 L.

[0110] In some specific embodiments, the reactor 43 is a flask with a volume of 200 to 500 mL; the first raw material tank 41 and the second raw material tank 42 are glass bottles with a volume of 5 to 15 L.

[0111] In some specific implementations, the waste liquid collector 45 is a glass bottle with a volume of 2 to 10 L.

[0112] In some specific embodiments, the first exhaust gas processor 44 and the second exhaust gas processor 46 are respectively composed of a plurality of glass bottles, each of which has a volume of 0.5 to 2 L, and each of which is filled with 3 / 5 to 4 / 5 of zinc acetate solution.

[0113] In some specific embodiments, the mouth of each glass bottle is plugged with a silicone plug and has two right-angle glass tubes passing through it, one of which extends to the bottom of the bottle and has a multi-hole outlet at the bottle port, which is the air inlet pipe; the other extends only to about 1 cm from the bottle mouth and does not extend into the zinc acetate solution, which is the air outlet pipe. The air inlet pipes and air outlet pipes in two adjacent glass bottles are connected by a tube, so that the glass bottles are connected in series, and finally the unconnected air inlet pipe is connected to the reactor through a tube.

[0114] In some specific embodiments, the first raw material tank 41 and the second raw material tank 42 are glass bottles with a volume of 5 to 15 L, a silicone plug is provided at the bottle mouth, two glass tubes are provided through the silicone plug and inserted into the glass bottles, and one of the glass tubes is connected to the reactor 43.

[0115] In some specific implementations, the pipe connecting the constant temperature circulating water tank 22 and the constant temperature heating interlayer 211 is a first liquid conduit 51 , and the first liquid conduit 51 is provided with a first liquid delivery pump 61 .

[0116] In some specific embodiments, the pipeline connecting the culture vessel 21 and the first liquid inlet 311 of the corrosion chamber 31 is a second liquid conduit 52, and the second liquid conduit 52 is provided with a second liquid delivery pump 62.

[0117] In some specific embodiments, the pipe connecting the overflow bottle 38 and the culture vessel 21 is a third liquid conduit 53, and the third liquid conduit 53 is provided with a third liquid delivery pump 63.

[0118] In some specific embodiments, the pipeline connecting the first raw material tank 41 and the reactor 43 is a fourth liquid conduit 54 , and a fourth liquid delivery pump 64 is disposed on the fourth liquid conduit 54 .

[0119] In some specific implementations, the pipeline connecting the second raw material tank 42 and the reactor 43 is a fifth liquid conduit 55 , and the fifth liquid conduit 55 is provided with a fifth liquid delivery pump 65 .

[0120] In some specific embodiments, the fourth liquid delivery pump 64 and the fifth liquid delivery pump 65 are connected to the controller. When the H2S sensor 39 detects the H2S concentration in the corrosion chamber 31 and transmits the signal to the controller, when the detected H2S concentration is lower than the set concentration, the controller controls the fourth liquid delivery pump 64 and the fifth liquid delivery pump 65 to turn on and pump the liquid in the first raw material tank 41 and the second raw material tank 42 into the reactor 43.

[0121] In some specific implementations, the pipe connecting the overflow bottle 38 and the first liquid outlet 312 of the corrosion chamber 31 is the sixth liquid guide pipe 56 .

[0122] In some specific embodiments, the pipe connecting the reactor 43 and the waste liquid collector 45 is a seventh liquid conduit 57 .

[0123] In some specific embodiments, the conduit connected to the waste liquid outlet 451 of the waste liquid collector 45 is the eighth liquid conduit 58 .

[0124] In some specific implementations, the pipe connecting the third liquid inlet of the constant temperature circulating water tank 22 and the constant temperature heating interlayer 211 is the ninth liquid conduit 59 .

[0125] In some specific embodiments, the pipe connecting the reactor 4 and the first exhaust gas processor 44 is a fourth air duct 74 .

[0126] In some specific implementations, the pipe connecting the overflow pipe 32 and the second exhaust gas processor 46 is a fifth air guide pipe 75 .

[0127] A method for simulating microbial corrosion of a sewage pipe is implemented by a sewage pipe microbial corrosion simulation device. A specimen 1 to be simulated is placed in the corrosion chamber 31, artificial sewage cultured in a culture vessel 21 is input into the corrosion chamber 31 through a first liquid inlet 311, and artificial sewage exceeding the height of the first liquid outlet 312 is returned to the culture vessel 21 through the first liquid outlet 312, so that the artificial sewage in the corrosion chamber 31 is always located at 1 / 3 to 2 / 3 of the height of the specimen 1 to be simulated, and the gas production module 4 transports H2S gas into the corrosion chamber 31 to simulate the microbial corrosion of the sewage pipe.

[0128] Example 1

[0129] A sewage pipe microbial corrosion simulation device, comprising:

[0130] A sewage circulation module 2, comprising a culture vessel 21 for culturing artificial sewage;

[0131] The corrosion chamber module 3 comprises a corrosion chamber 31 with a specimen 1 to be simulated placed therein and with constant temperature and humidity, the side wall of the corrosion chamber 31 is provided with a first liquid inlet 311 connected to the pipeline of the culture vessel 31 and used for conveying artificial sewage and a first liquid outlet 312 for reflux of artificial sewage, 1 / 3 to 2 / 3 of the height of the specimen 1 to be simulated is flush with the first liquid outlet 311, and the height of the first liquid inlet 311 is lower than that of the first liquid outlet 312;

[0132] And a gas production module 4 connected to the corrosion chamber 31 through a pipeline and conveying H2S gas thereto.

[0133] In this embodiment, an overflow bottle 38 for receiving artificial sewage overflowing from the corrosion chamber 31 is arranged between the first liquid outlet 311 of the corrosion chamber 31 and the culture vessel 31, and is connected to the first liquid outlet 311 and the culture vessel 31 through a pipeline.

[0134] In this embodiment, the outer wall of the artificial sewage in the culture vessel 21 is provided with an interlayer 211 for constant temperature heating.

[0135] In this embodiment, the constant temperature heating interlayer 211 is an interlayer with constant temperature water, and its side wall is provided with a second liquid inlet 2111 connected to the constant temperature circulating water tank 22 pipeline and used for inputting constant temperature water, and a second liquid outlet 2112 connected to the constant temperature circulating water tank 22 pipeline and used for outputting and reflowing constant temperature water.

[0136] In this embodiment, a stirrer is disposed inside the culture vessel 21, and a sampling port is disposed at the top thereof.

[0137] In this embodiment, a heater 34 for heating is provided at the upper inner portion of the etching chamber 31;

[0138] The side wall of the corrosion chamber 31 is provided with an air inlet nozzle 313 and an air outlet nozzle 314 connected to the drying pipe 35, and the pipeline connecting the air outlet nozzle 314 and the drying pipe 35 is provided with a first valve 36 and a first gas pump 37;

[0139] A second valve 47 and a second gas pump 48 are provided on the pipeline connecting the gas production module 4 and the corrosion chamber 31 .

[0140] In this embodiment, the heater 34, the first valve 36, the first gas pump 37, the second valve 47, and the second gas pump 48 are connected to a controller, and the controller is connected to a first temperature sensor 32, a humidity sensor 33, and an H2S sensor 39 disposed on the inner wall of the corrosion chamber 31;

[0141] The first temperature sensor 32 detects the temperature in the corrosion chamber 31 and transmits a signal to the controller. When the detected temperature is lower than the set temperature, the controller controls the heater 34 to start, and when the detected temperature is higher than or equal to the set temperature, the controller controls the heater 34 to turn off;

[0142] The humidity sensor 33 detects the humidity in the corrosion chamber 31 and transmits a signal to the controller. When the detected humidity is higher than the set humidity, the controller controls the first valve 36 to open and the first gas pump 37 to start. When the detected humidity is lower than or equal to the set humidity, the controller controls the first valve 36 to close and the first gas pump 37 to close.

[0143] The H2S sensor 39 detects the H2S concentration in the corrosion chamber 31 and transmits a signal to the controller. When the detected H2S concentration is lower than the set concentration, the controller controls the second valve 47 to open and the second gas pump 48 to start. When the detected H2S concentration is higher than or equal to the set concentration, the controller controls the second valve 47 to close and the second gas pump 48 to close.

[0144] In this embodiment, the gas production module 4 includes:

[0145] A first raw material tank 41 and a second raw material tank 42 for storing an acid solution and an alkaline sulfide salt solution, respectively;

[0146] A reactor 43 is connected to the first raw material tank 41 and the second raw material tank 42 through pipelines and is used for supplying acid solution and alkaline sulfide salt solution for reaction.

[0147] In this embodiment, the reactor 43 is connected to a first exhaust gas processor 44 and a waste liquid collector 45 through a pipeline, and the corrosion chamber 31 is connected to a second exhaust gas processor 46 through a pipeline.

[0148] A method for simulating microbial corrosion of a sewage pipe is implemented using a sewage pipe microbial corrosion simulation device described in this embodiment, wherein a specimen 1 to be simulated is placed in the corrosion chamber 31, artificial sewage cultured in a culture vessel 21 is input into the corrosion chamber 31 through a first liquid inlet 311, and artificial sewage exceeding the height of the first liquid outlet 312 is returned to the culture vessel 21 through the first liquid outlet 312, so that the artificial sewage in the corrosion chamber 31 is always located at 1 / 3 to 2 / 3 of the height of the specimen 1 to be simulated, and the gas production module 4 transports H2S gas into the corrosion chamber 31 to simulate the microbial corrosion of the sewage pipe.

[0149] Example 2

[0150] like Figure 1 As shown, a sewage pipe microbial corrosion simulation device comprises:

[0151] A sewage circulation module 2, comprising a culture vessel 21 for culturing artificial sewage;

[0152] The corrosion chamber module 3 comprises a corrosion chamber 31 with a specimen 1 to be simulated placed therein and with constant temperature and humidity, the side wall of the corrosion chamber 31 is provided with a first liquid inlet 311 connected to the pipeline of the culture vessel 31 and used for conveying artificial sewage and a first liquid outlet 312 for reflux of artificial sewage, 1 / 3 to 2 / 3 of the height of the specimen 1 to be simulated is flush with the first liquid outlet 311, and the height of the first liquid inlet 311 is lower than that of the first liquid outlet 312;

[0153] And a gas production module 4 connected to the corrosion chamber 31 through a pipeline and conveying H2S gas thereto.

[0154] In this embodiment, an overflow bottle 38 for receiving artificial sewage overflowing from the corrosion chamber 31 is arranged between the first liquid outlet 311 of the corrosion chamber 31 and the culture vessel 31, and is connected to the first liquid outlet 311 and the culture vessel 31 through a pipeline.

[0155] In this embodiment, the outer wall of the artificial sewage in the culture vessel 21 is provided with an interlayer 211 for constant temperature heating.

[0156] In this embodiment, the constant temperature heating interlayer 211 is an interlayer with constant temperature water, and its side wall is provided with a second liquid inlet 2111 connected to the constant temperature circulating water tank 22 pipeline and used for inputting constant temperature water, and a second liquid outlet 2112 connected to the constant temperature circulating water tank 22 pipeline and used for outputting and reflowing constant temperature water.

[0157] In this embodiment, the constant temperature circulating water tank 22 is heated by a constant temperature heater 221. The constant temperature circulating water tank 22 is heated by the constant temperature heater 221, and the constant temperature heater 221 is connected to a second temperature sensor 222, and the second temperature sensor 222 is connected to a controller. The second temperature sensor 222 detects the water temperature in the constant temperature circulating water tank 22 and transmits a signal to the controller. When the detected water temperature is lower than the set temperature, the constant temperature heater 221 is controlled to turn on.

[0158] In this embodiment, a stirrer is disposed inside the culture vessel 21, and a sampling port is disposed at the top thereof.

[0159] In this embodiment, a heater 34 for heating is provided at the upper inner portion of the etching chamber 31;

[0160] The side wall of the corrosion chamber 31 is provided with an air inlet nozzle 313 and an air outlet nozzle 314 connected to the drying pipe 35, and the pipeline connecting the air outlet nozzle 314 and the drying pipe 35 is provided with a first valve 36 and a first gas pump 37;

[0161] A second valve 47 and a second gas pump 48 are provided on the pipeline connecting the gas production module 4 and the corrosion chamber 31 .

[0162] In this embodiment, the heater 34 is a hot fan.

[0163] In this embodiment, water-absorbing silica gel is disposed in the drying tube 35 .

[0164] In this embodiment, the heater 34, the first valve 36, the first gas pump 37, the second valve 47, and the second gas pump 48 are connected to a controller, and the controller is connected to a first temperature sensor 32, a humidity sensor 33, and an H2S sensor 39 disposed on the inner wall of the corrosion chamber 31;

[0165] The first temperature sensor 32 detects the temperature in the corrosion chamber 31 and transmits a signal to the controller. When the detected temperature is lower than the set temperature, the controller controls the heater 34 to start, and when the detected temperature is higher than or equal to the set temperature, the controller controls the heater 34 to turn off;

[0166] The humidity sensor 33 detects the humidity in the corrosion chamber 31 and transmits a signal to the controller. When the detected humidity is lower than the set humidity, the controller controls the first valve 36 to open and the first gas pump 37 to start. When the detected humidity is higher than or equal to the set humidity, the controller controls the first valve 36 to close and the first gas pump 37 to close.

[0167] The H2S sensor 39 detects the H2S concentration in the corrosion chamber 31 and transmits a signal to the controller. When the detected H2S concentration is lower than the set concentration, the controller controls the second valve 47 to open and the second gas pump 48 to start. When the detected H2S concentration is higher than or equal to the set concentration, the controller controls the second valve 47 to close and the second gas pump 48 to close.

[0168] In this embodiment, the pipeline connecting the drying tube 35 and the gas outlet nozzle 314 of the corrosion chamber 1 is the first gas guide pipe 71, that is, the pipeline where the first valve 36 and the first gas pump 37 are located.

[0169] In this embodiment, the pipe connecting the drying pipe 35 and the air inlet nozzle 313 of the corrosion chamber 31 is a second air guide pipe 72.

[0170] In this embodiment, the pipeline where the second valve 47 and the second gas pump 48 are located is the third gas guide pipe 73 .

[0171] In this embodiment, the H2S measurement range of the H2S sensor 39 is 0 to 1000 ppm.

[0172] In this embodiment, the gas production module 4 includes:

[0173] A first raw material tank 41 and a second raw material tank 42 for storing an acid solution and an alkaline sulfide salt solution, respectively;

[0174] A reactor 43 is connected to the first raw material tank 41 and the second raw material tank 42 through pipelines and is used for supplying acid solution and alkaline sulfide salt solution for reaction.

[0175] In this embodiment, the reactor 43 is connected to a first exhaust gas processor 44 and a waste liquid collector 45 through a pipeline, and the corrosion chamber 31 is connected to a second exhaust gas processor 46 through a pipeline.

[0176] In this embodiment, the first exhaust gas processor 44 and the second exhaust gas processor 46 are filled with 1 mol / L zinc acetate solution.

[0177] In this embodiment, in order to prevent the H2S in the reactor 43 from overflowing to the outside of the reactor 43, the reactor 43 is welded to the pipeline, or a sealing rubber plug is provided at the connection, or the two are an integrated structure, or other conventional technical means in the field are adopted.

[0178] In this embodiment, the reactor 43 is connected to the waste liquid collector 45 through an inverted U-shaped conduit, and the inner parts of the first raw material tank 41 and the second raw material tank 42 extend to the bottom of the reactor 43, and the highest point is located at 1 / 2 of the height of the reactor 43.

[0179] In this embodiment, a waste liquid outlet 451 is provided on the lower side wall or the bottom of the waste liquid collector 45 and is sealed by a screw cap.

[0180] In this embodiment, the culture vessel 21 is a glass reactor with a volume of 1 L. The reactor is provided with three openings, including a vertical opening and two inclined openings. The agitator extends into the culture vessel 21 from the vertical opening.

[0181] In this embodiment, the constant temperature circulating water tank 22 is a plastic box with a capacity of 20L, and is filled with 1 / 2 water.

[0182] In this embodiment, a third liquid outlet is provided at the lower portion of the side wall of the constant temperature water tank 22, which is connected to the second liquid inlet 2111 of the constant temperature heating interlayer 211 through a pipe; a third liquid inlet is provided at the top or upper portion of the side wall of the constant temperature water tank 22, which is connected to the second liquid outlet 2112 of the constant temperature heating interlayer 211 through a pipe.

[0183] In this embodiment, the overflow bottle 38 is a glass bottle with a solvent volume of 500 mL, and a screw cap for sealing is provided at the bottle mouth.

[0184] In this embodiment, the corrosion chamber 31 is a sealed plastic box, which usually adopts a rectangular structure, with a length of 30 cm, a width of 25 cm, a height of 20 cm, and a volume of 9L.

[0185] In this embodiment, the reactor 43 is a flask with a volume of 250 mL; the first raw material tank 41 and the second raw material tank 42 are glass bottles with a volume of 5 to 15 L.

[0186] In this embodiment, the waste liquid collector 45 is a glass bottle with a volume of 5L.

[0187] In this embodiment, the first exhaust gas processor 44 and the second exhaust gas processor 46 are respectively composed of a plurality of glass bottles, each of which has a volume of 1 L and each of which is filled with 4 / 5 of zinc acetate solution.

[0188] In this embodiment, the mouth of each glass bottle is plugged with a silicone plug and has two right-angle glass tubes passing through it, one of which extends to the bottom of the bottle and has a multi-hole outlet at the bottle end, which is the air inlet pipe; the other extends only to about 1 cm from the bottle mouth and does not extend into the zinc acetate solution, which is the air outlet pipe. The air inlet pipes and air outlet pipes in two adjacent glass bottles are connected by a tube, so that the glass bottles are connected in series, and finally the unconnected air inlet pipe is connected to the reactor through a tube.

[0189] In this embodiment, the first raw material tank 41 and the second raw material tank 42 are glass bottles with a volume of 10 L. A silicone plug is provided at the bottle mouth, and two glass tubes are provided through the silicone plug and inserted into the glass bottles, and one of the glass tubes is connected to the reactor 43.

[0190] In this embodiment, the pipe connecting the constant temperature circulating water tank 22 and the constant temperature heating interlayer 211 is a first liquid conduit 51 , and the first liquid conduit 51 is provided with a first liquid delivery pump 61 .

[0191] In this embodiment, the pipeline connecting the culture vessel 21 and the first liquid inlet 311 of the corrosion chamber 31 is a second liquid conduit 52, and a second liquid delivery pump 62 is provided on the second liquid conduit 52.

[0192] In this embodiment, the pipeline connecting the overflow bottle 38 and the culture vessel 21 is a third liquid conduit 53, and the third liquid conduit 53 is provided with a third liquid delivery pump 63.

[0193] In this embodiment, the pipeline connecting the first raw material tank 41 and the reactor 43 is a fourth liquid conduit 54 , and a fourth liquid delivery pump 64 is disposed on the fourth liquid conduit 54 .

[0194] In this embodiment, the pipeline connecting the second raw material tank 42 and the reactor 43 is a fifth liquid conduit 55 , and a fifth liquid delivery pump 65 is disposed on the fifth liquid conduit 55 .

[0195] In this embodiment, the fourth liquid delivery pump 64 and the fifth liquid delivery pump 65 are connected to the controller. When the H2S sensor 39 detects the H2S concentration in the corrosion chamber 31 and transmits the signal to the controller, when the detected H2S concentration is lower than the set concentration, the controller controls the fourth liquid delivery pump 64 and the fifth liquid delivery pump 65 to turn on and pump the liquid in the first raw material tank 41 and the second raw material tank 42 into the reactor 43.

[0196] In this embodiment, the pipe connecting the overflow bottle 38 and the first liquid outlet 312 of the corrosion chamber 31 is the sixth liquid guide pipe 56 .

[0197] In this embodiment, the pipe connecting the reactor 43 and the waste liquid collector 45 is the seventh liquid conduit 57 .

[0198] In this embodiment, the conduit connected to the waste liquid outlet 451 of the waste liquid collector 45 is the eighth liquid conduit 58 .

[0199] In this embodiment, the pipe connecting the third liquid inlet of the constant temperature circulating water tank 22 and the constant temperature heating interlayer 211 is the ninth liquid guide pipe 59 .

[0200] In this embodiment, the pipe connecting the reactor 4 and the first exhaust gas processor 44 is a fourth air duct 74 .

[0201] In this embodiment, the pipe connecting the overflow pipe 32 and the second exhaust gas processor 46 is a fifth air guide pipe 75 .

[0202] A method for simulating microbial corrosion of a sewage pipe is implemented by a sewage pipe microbial corrosion simulation device. A specimen 1 to be simulated is placed in the corrosion chamber 31, artificial sewage cultured in a culture vessel 21 is input into the corrosion chamber 31 through a first liquid inlet 311, and artificial sewage exceeding the height of the first liquid outlet 312 is returned to the culture vessel 21 through the first liquid outlet 312, so that the artificial sewage in the corrosion chamber 31 is always located at 1 / 2 of the height of the specimen 1 to be simulated, and the gas production module 4 transports H2S gas into the corrosion chamber 31 to achieve simulation of microbial corrosion of the sewage pipe.

[0203] In this embodiment, when implementing the simulation test, the laboratory environment temperature should be kept lower than the simulation test requirement temperature, the recommended temperature is (20±2)°C, and the laboratory should have fully functional ventilation facilities and be equipped with a hydrogen sulfide concentration alarm with good detection function.

[0204] Pour enough tap water into the constant temperature circulating water tank 22, heat it through the constant temperature heater 221, detect the water temperature through the second temperature sensor 222, wait for the water temperature to reach the set value, start the first liquid delivery pump 61, and the constant temperature water is pumped into the constant temperature heating interlayer of the incubator 21 through the first liquid guide tube 51, and then flows back to the constant temperature circulating water tank 22 through the ninth liquid guide tube 59, forming a cycle to keep the incubator 21 at a constant temperature. The second temperature sensor 222 detects the water temperature in the constant temperature circulating water tank 22 and transmits a signal to the controller. When the detected water temperature is lower than the set temperature, the constant temperature heater 221 is controlled to turn on.

[0205] Artificial sewage with specific components (including 0.175 g of peptone, 0.095 g of beef extract, 0.265 g of NaHCO3, 0.23 g of urea, 0.055 g of NaCl, 0.0265 g of CaCl2, 0.0175 g of MgSO4·7H2O, and 0.001835 g of K2HPO4) was prepared according to the experimental requirements and poured into the incubator 21, and specific microorganisms (Acidithiobacillus thiooxidans, Acidithiobacillus ferroxidans, Halothiobacillus neapolitanus, and Acidiphiliumcryptum, all purchased from Ningbo Mingzhou Biotechnology Co., Ltd.) were inoculated.

[0206] Start the agitator and start cultivating artificial sewage. During the cultivation period, collect sewage samples through the sampling port at the upper end of the incubator 21 regularly to detect the pH value and microbial concentration of the sewage. When the test results show that the microbial growth has entered the logarithmic phase, place the simulated specimen 1 in the corrosion chamber 31 so that the middle height of the simulated specimen 1 is flush with the height of the first liquid outlet 312 with a higher liquid level in the corrosion chamber 31, and then seal the corrosion chamber 31.

[0207] The second liquid outlet 2112 at the lower end of the incubator 21 is opened, and the second liquid delivery pump 62 is started, and the artificial sewage is pumped into the corrosion chamber 31 through the second liquid conduit 52. Then the water level in the corrosion chamber 31 gradually rises to the higher first liquid outlet 312, and the simulated specimen 1 is half immersed in the sewage, and the sewage overflows from the first liquid outlet 312, flows to the overflow bottle 38 through the sixth conduit 56, and gathers at the bottom of the overflow bottle 38. Under the power of the third liquid delivery pump 63, the sewage in the overflow bottle 38 is pumped back to the incubator 21 through the third liquid conduit 53 to form a cycle. The liquid flow rates in the second liquid conduit 52 and the third liquid conduit 53 are equal, so the water levels in the corrosion chamber 31 and the incubator 21 remain constant.

[0208] The controller is started to control the first temperature sensor 32 and the humidity sensor 33 to start detecting the temperature and humidity of the gas phase space of the corrosion chamber 31. Since the corrosion chamber 31 transfers heat with the outside through the side wall and the bottom surface, the first temperature sensor 32 detects the air temperature in the corrosion chamber 31 and transmits the signal to the controller. When the detected temperature is lower than the set temperature, the controller controls the heater 34 to start until the set temperature is reached. When the detected temperature is higher than or equal to the set temperature, the controller controls the heater 34 to turn off. The humidity sensor 33 detects the humidity in the corrosion chamber 31 and transmits the signal to the controller. When the detected humidity is higher than the set humidity, the controller controls the first valve 36 to open and the first gas pump 37 to start. The high-humidity gas in the corrosion chamber 31 is pumped into the drying tube 35 along the first air duct 71 by the first gas pump 37, and then the low-humidity gas flows back to the corrosion chamber 31 through the second air duct 72, and the humidity in the corrosion chamber decreases until the set humidity is reached; when the detected humidity is lower than or equal to the set humidity, the controller controls the first valve 36 to close and the first gas pump 37 to close. Through the above process, the temperature and humidity in the etching chamber 31 are kept constant.

[0209] After the temperature and humidity in the corrosion chamber 31 are constant, 4 mol / L sulfuric acid solution is added to the first raw material tank 41, and 8 mol / L sodium sulfide solution is added to the second raw material tank 42, and the pH of the solution is adjusted to be greater than 13 with sodium hydroxide. The waste liquid outlet 451 of the waste liquid collector 45 is closed, and then the H2S sensor 39 is started, and the hydrogen sulfide concentration value unit ppm required by the simulation test is set. At this time, the dynamic H2S sensor 39 starts to detect the H2S concentration in the corrosion chamber 31 and transmits the signal to the controller. When the detected H2S concentration is lower than the set concentration, the controller controls the fourth liquid delivery pump 64 and the fifth liquid delivery pump 65 to start, and pumps the liquid in the first raw material tank 41 and the second raw material tank 42 into the reactor 43, so that the sulfuric acid and the sodium sulfide solution contact in the reactor 43 to react and generate H2S gas. At the same time, the controller controls the second valve 47 to open and the second gas pump 48 to start, so that the H2S gas in the reactor 43 can enter the corrosion chamber 31, so that the H2S gas concentration in the corrosion chamber 31 increases. When the H2S gas concentration increases to a set value, the controller controls the second valve 47 to close, the fourth liquid delivery pump 64 and the fifth liquid delivery pump 65 to stop running, so that the reaction in the reactor 43 is terminated and the H2S gas cannot flow into the etching chamber 31. Through the above process, the H2S gas concentration in the etching chamber 31 remains constant, and the internal H2S gas cannot escape due to the liquid seal. The excess H2S gas will enter the second exhaust gas processor 46.

[0210] As the simulation device operates, the liquid level in the reactor 43 gradually rises. When the liquid level rises to a level higher than the highest point of the inverted U-shaped glass conduit on the side wall of the reactor 43, the liquid in the reactor 43 will be siphoned into the waste liquid collector 45 until the liquid level in the reactor 43 is lower than the lower opening of the inverted U-shaped conduit in the reactor 43. In this way, the reactor 43 can continue to operate without manually dumping the internal liquid. When there is too much waste liquid in the waste liquid collector 45, open its lower waste liquid outlet 451, discharge the waste liquid, and treat it in a manner that complies with laboratory safety, and then close the water outlet again.

[0211] Through the above process, the simulation device is continuously operated until the required simulation time is reached. At this time, at least two experimenters should wear complete protective equipment with the function of protecting hydrogen sulfide gas to enter the laboratory, disconnect all power supplies of the device, and turn on the laboratory ventilation facilities. Then open the upper cover of the corrosion chamber 31, evacuate the laboratory, and close the doors and windows of the laboratory. After waiting for the hydrogen sulfide concentration in the room to drop to a human safety value, put on protective equipment again, enter the room with a hydrogen sulfide concentration detector, take out the specimen to be simulated 1, and close the upper cover of the corrosion chamber. Although the present invention has been described in detail above with general descriptions, specific implementation methods and tests, it is obvious to those skilled in the art that some modifications or improvements can be made to it on the basis of the present invention. Therefore, these modifications or improvements made on the basis of not departing from the spirit of the present invention are all within the scope of protection claimed by the present invention.

Claims

1. A sewage pipe microbial corrosion simulation device, characterized in that: include: A sewage circulation module (2), comprising a culture vessel (21) for culturing artificial sewage; A corrosion chamber module (3), comprising a corrosion chamber (31) with a specimen to be simulated (1) placed therein and maintained at a constant temperature and humidity, the side wall of the corrosion chamber (31) being provided with a first liquid inlet (311) connected to a pipeline of the incubator (31) and used for conveying artificial sewage, and a first liquid outlet (312) for returning artificial sewage, 1 / 3 to 2 / 3 of the height of the specimen to be simulated (1) being flush with the first liquid outlet (311), and the height of the first liquid inlet (311) being lower than that of the first liquid outlet (312); and a gas production module (4) connected to the corrosion chamber (31) through a pipeline and conveying H2S gas thereto.

2. A sewage pipe microbial corrosion simulation device according to claim 1, characterized in that: An overflow bottle (38) for receiving artificial sewage overflowing from the corrosion chamber (31) is arranged between the first liquid outlet (311) of the corrosion chamber (31) and the culture vessel (31), and is connected to the first liquid outlet (311) and the culture vessel (31) through a pipeline.

3. A sewage pipe microbial corrosion simulation device according to claim 1, characterized in that: The outer wall of the artificial sewage in the culture vessel (21) is provided with an interlayer (211) for constant temperature heating.

4. A sewage pipe microbial corrosion simulation device according to claim 1, characterized in that: The constant temperature heating interlayer (211) is an interlayer with constant temperature water, and its side wall is provided with a second liquid inlet (2111) connected to the pipeline of the constant temperature circulating water tank (22) and used for inputting constant temperature water, and a second liquid outlet (2112) connected to the pipeline of the constant temperature circulating water tank (22) and used for outputting and reflowing constant temperature water.

5. A sewage pipe microbial corrosion simulation device according to claim 1, characterized in that: The culture vessel (21) is provided with a stirrer inside and a sampling port at the top.

6. A sewage pipe microbial corrosion simulation device according to claim 1, characterized in that: A heater (34) for heating is provided at the inner upper part of the corrosion chamber (31); The side wall of the corrosion chamber (31) is provided with an air inlet nozzle (313) and an air outlet nozzle (314) connected to the drying pipe (35) pipeline, and the pipeline connecting the air outlet nozzle (314) and the drying pipe (35) is provided with a first valve (36) and a first gas pump (37); A second valve (47) and a second gas pump (48) are provided on the pipeline connecting the gas production module (4) and the corrosion chamber (31).

7. A sewage pipe microbial corrosion simulation device according to claim 6, characterized in that: The heater (34), the first valve (36), the first gas pump (37), the second valve (47), and the second gas pump (48) are connected to a controller, and the controller is connected to a first temperature sensor (32), a humidity sensor (33), and an H2S sensor (39) disposed on the inner wall of the corrosion chamber (31); The first temperature sensor (32) detects the temperature in the corrosion chamber (31) and transmits a signal to a controller. When the detected temperature is lower than a set temperature, the controller controls the heater (34) to start, and when the detected temperature is higher than or equal to the set temperature, the controller controls the heater (34) to turn off; The humidity sensor (33) detects the humidity in the corrosion chamber (31) and transmits a signal to the controller. When the detected humidity is higher than the set humidity, the controller controls the first valve (36) to open and the first gas pump (37) to start. When the detected humidity is lower than or equal to the set humidity, the controller controls the first valve (36) to close and the first gas pump (37) to stop. The H2S sensor (39) detects the H2S concentration in the corrosion chamber (31) and transmits a signal to the controller. When the detected H2S concentration is lower than a set concentration, the controller controls the second valve (47) to open and the second gas pump (48) to start. When the detected H2S concentration is higher than or equal to the set concentration, the controller controls the second valve (47) to close and the second gas pump (48) to stop.

8. The sewage pipe microbial corrosion simulation device according to claim 1 is characterized in that: The gas production module (4) comprises: A first raw material tank (41) and a second raw material tank (42) for storing an acid solution and an alkaline sulfide salt solution, respectively; A reactor (43) connected to the first raw material tank (41) and the second raw material tank (42) through pipelines and used for supplying acid solution and alkaline sulfide salt solution for reaction.

9. A sewage pipe microbial corrosion simulation device according to claim 8, characterized in that: The pipeline of the reactor (43) is connected to a first waste gas processor (44) and a waste liquid collector (45), and the pipeline of the corrosion chamber (31) is connected to a second waste gas processor (46).

10. A method for simulating microbial corrosion of a sewage pipe, which is implemented by using a sewage pipe microbial corrosion simulation device according to any one of claims 1 to 9, characterized in that: A simulated specimen (1) is placed in the corrosion chamber (31), artificial sewage cultured in a culture vessel (21) is input into the corrosion chamber (31) through a first liquid inlet (311), and artificial sewage exceeding the height of the first liquid outlet (312) is returned to the culture vessel (21) through the first liquid outlet (312), so that the artificial sewage in the corrosion chamber (31) is always located at 1 / 3 to 2 / 3 of the height of the simulated specimen (1), and the gas production module (4) transports H2S gas into the corrosion chamber (31) to achieve simulation of microbial corrosion of a sewage pipe.

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