CN201034917Y - A ring-type multiphase flow erosion test device - Google Patents

Abstract

The utility model discloses a ring type multiphase flow erosion test device. It includes: gas, oil, water three-phase separation tank and three-phase pipeline circulation system, namely the top outlet of the three-phase separation tank, cooler, cyclone separator, circulating gas screw compressor to the gas phase system before the pipeline filter, three The oil phase system from the middle outlet of the phase separation tank, the diesel magnetic drive pump, the heater to the pipeline filter, the water phase system from the bottom outlet of the three-phase separation tank, the sewage metering pump, the heater to the pipeline filter; after three-phase mixing It is connected with the three-phase separation tank through the pipeline filter and the test platform of the test piece. The utility model can simulate the erosion research cases of actual pipeline fittings such as tees, elbows, big and small heads, liners, etc., and carry out the prediction research on the transient characteristics of gas, oil, and water multiphase flow erosion damage.

Description

A ring-type multiphase flow erosion test device

technical field

The utility model relates to an erosion test device, in particular to a ring type multiphase flow erosion test device.

Background technique

Fluid pipeline is a special equipment for conveying fluid under certain temperature and pressure conditions. With the development of economy and technology, people pay more and more attention to the role of pipeline in transportation. Now it has become one of the five major transportation methods alongside highway, railway, water transportation and aviation, and is widely used in west-east gas transmission, urban Fluid transportation and system engineering such as gas pipeline network and petrochemical equipment.

In recent years, in the field of petrochemical industry, with the increasing processing proportion of heavy and sulfur-containing crude oil, the erosion failure of pipelines and tube bundle equipment (heat exchangers, air coolers, etc.) in the petrochemical industry is more common, such as: hydrogenation reaction effluent Air cooler (REAC) failure accidents have become increasingly prominent, and have become an important obstacle that seriously restricts the safe, stable, and long-term operation of hydrocracking units. If corresponding technical measures and countermeasures are not taken, my country's oil refining industry will face increasingly severe problems. equipment corrosion and safety issues.

The failure of pipelines in the petrochemical industry has various forms and complex mechanisms, such as material defects, various forms of corrosion, creep, external force damage, etc. Among them, corrosion failure caused by erosion damage is the most common in pipeline system damage. The combined process of corrosion. Erosion damage is obviously localized, sudden, destructive and risky, especially under the action of multiphase flow containing oil, gas, water and various corrosive media, it is more likely to cause erosion and perforation, and the situation is complicated. It is difficult to predict its occurrence, which has become a key technical problem that plagues the safe operation of fluid pipelines, and has attracted people's attention day by day.

Aiming at the current problems of pipeline plugging or erosion in the fields of petrochemical and natural gas transportation, in order to further study the failure mechanism of industrial pipelines at a deeper level, some scientific research institutes and colleges and universities have designed a series of erosion test devices. Experimental research methods are used to study the failure mechanism of industrial pipelines, so as to be applied to engineering practice and improve the stability of industrial pipeline systems. However, the shortcomings of the existing erosion test equipment mainly lie in:

(1) The erosion failure of industrial pipelines in actual engineering applications is often the result of the coupling of corrosion and multiphase flow, but most of the existing test devices can only simulate the erosion corrosion process under single-phase flow conditions, and it is difficult Study on erosion failure of industrial pipelines.

(2) Conventional test methods usually measure the erosion rate by weighing and measuring the thickness, which cannot realize the transient characteristics of the critical value of industrial pipeline erosion damage.

(3) At present, the research on the mechanism of erosion test in my country is not deep enough, the test methods of related equipment are far from the actual working conditions, and the experimental results are difficult to promote engineering applications.

Therefore, a ring-type multiphase flow erosion test device that can simulate the actual working conditions is designed, which can test the results of erosion mechanism research and numerical simulation calculations, and lay a foundation for the engineering application of erosion prediction.

Contents of the invention

Aiming at the deficiencies of erosion test devices at home and abroad, the purpose of this utility model is to provide a ring-type multiphase flow erosion test device, which is suitable for the simulation analysis of erosion mechanism and fluid dynamics of corrosion and flow coupling, A complete research system including erosion test research on critical characteristics of protective film and engineering application promotion. It is an erosion test device that can simulate the actual working conditions in the industrial environment, is suitable for the erosion test of various structures such as tees, elbows, small heads, and liners, and can detect the transient characteristics of material erosion damage in real time.

In order to achieve the above object, the technical scheme that the utility model adopts is:

1. A loop type multiphase flow erosion test device: including a sewage metering pump, a three-phase separation tank, a cyclone separator, a cooler, a circulating air screw compressor, a pipeline filter, a heater, and a diesel magnetic drive pump; Among them, the outlet of the sewage metering pump is divided into two branches, the main branch is connected in series with the first flow meter and the first one-way valve to the inlet of the heater, and the secondary branch is connected to the lower part of the three-phase separation tank through the first gate valve; the pad The inlet of the liquid line is respectively connected to the inlet of the sewage metering pump through the second gate valve and connected to the bottom of the three-phase separation tank through the third gate valve; the top outlet of the three-phase separation tank is connected to the first pressure control valve, the cooler and the upper part of the cyclone separator in order to connect the circulating gas The inlet of the screw compressor has two outlets, one is connected with the second one-way valve through the fourth gate valve, and the other is connected with the inlet of the second one-way valve through the fifth gate valve and the first temperature control valve; the second one-way The valve outlet is divided into two branches, the main branch is connected to the heater outlet through the second flow meter, and the secondary branch is respectively connected to the upper part of the foam breaking net of the three-phase separation tank through the first flow control valve and the second pressure control valve. It is connected to the exhaust gas discharge port; the second flowmeter of the main branch is connected to the nitrogen inlet through the sixth gate valve; the lower end of the foam breaking net of the three-phase separation tank is provided with two inlets and one outlet, and the outlet is connected to the diesel magnetic drive through the seventh gate valve The inlet of the pump; the outlet of the diesel magnetic drive pump is divided into two paths, one path is connected to the heater inlet through the third check valve, the third flow meter, and the second flow control valve, and the other path passes through the eighth gate valve and the middle part of the three-phase separation tank. The first inlet is connected; the outlet of the heater is connected with the pipeline filter and the inlet of the test piece in turn; the outlet of the test piece is connected with the fourth flowmeter, the third flow control valve, the metal hose and the return pipeline, and the return pipeline is connected The second inlet in the middle of the three-phase separation tank.

A foam breaking net is provided between the upper gas phase and the middle oil phase of the three-phase separation tank, and the foam breaking material is stainless steel; a liquid level gauge is set between the middle oil phase and the lower water phase; the boundary between the lower part and the bottom of the three-phase separation tank is Position gauge, and a safety valve is added on the top of the three-phase separation tank.

The cyclone separator is composed of two parts, the upper part is a separation tank, the lower part is a pressure tank, and the middle part is connected by a pipeline connection valve; the lower part of the separation tank is equipped with a liquid level alarm device, and a nitrogen inlet is opened on the top of the pressure tank, and the bottom of the pressure tank is connected through the second The nine-gate valve is connected to the lower part of the three-phase separation tank.

The other outlet of the test piece is connected through the fifth flowmeter, the fourth flow control valve and the return pipeline.

The test piece adopts the structure of tee, elbow, big and small head, and liner, and the material of the test piece is carbon steel.

The three phases in the three-phase separation tank are gas phase, oil phase and water phase, namely nitrogen, diesel oil and sulfur-containing sewage respectively.

The utility model has the beneficial effects that: the electrochemical test system can simulate the typical pipe fittings of the multiphase flow pipeline to realize the transient characteristic test of erosion damage, including the critical characteristics of the erosion damage of the protective film and the actual erosion after exceeding the critical value rate. The use of industrial computer and flow control system can realize the critical characteristic test of the protective film of the working electrode under different flow rates (to ensure that the composition of the multiphase flow is equal to the actual working condition). The use of magnetic drive pumps and diaphragm metering pumps can achieve zero leakage on site. The aftercooler of the screw compressor is divided into two outlets at the front and rear, which can realize the cooling and heating of the gas phase medium. The cyclone separator is used to ensure that the condensed oil is separated cleanly and to prevent the oil from being carried during the operation of the compressor. The upper part of the liquid level alarm device and the lower part are equipped with a nitrogen pressure tank to ensure the material balance of the circulation system. The setting of nitrogen supplement, nitrogen venting and safety valve is to ensure the safety of the three-phase separation tank and the stability of the test working conditions. The temperature control and adjustment system can approach the real operating conditions through cyclic operation. The setting of the filter has two functions, one is to ensure that the multiphase flow medium does not contain solid particles such as corrosion products, and it can also ensure that the multiphase flow medium is uniformly atomized. Fluid dynamics simulation analysis can be carried out on the test process of the erosion sample; the test results can be combined with the simulation analysis of the pipeline system to promote engineering applications. The utility model can simulate a series of actual engineering erosion failure cases such as industrial pipelines, long-distance pipelines, hydrogenation air cooler tube bundles, heat exchanger tube bundles, etc., and conduct erosion damage failure research, erosion prediction, optimal design, risk inspection, Research on safety assurance technology for pipelines and tube bundle equipment such as safety assessment and life prediction. In addition, the utility model has a simple structure and is easy to popularize.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Fig. 2 is an enlarged view of A in Fig. 1 .

Figure 3 is a structural diagram of a three-phase separation tank.

In the figure: 1, sewage metering pump 2, liquid level gauge 3, boundary gauge 4, three-phase separation tank 5, foam breaking net 6, safety valve 7, nitrogen inlet 8, liquid level alarm device 9, cyclone separator 10, Pipe connection valve 11, cooler 12, circulating gas screw compressor 13, waste gas discharge port 14, nitrogen inlet 15, return main pipe 16, metal hose 17, test piece 18, pipeline filter 19, heater outlet 20, heating Device 21, heater inlet 22, diesel magnetic drive pump 23, pad liquid line inlet

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

As shown in Figure 1, the utility model includes a sewage metering pump 1, a three-phase separation tank 4, a cyclone separator 9, a cooler 11, a circulating air screw compressor 12, a pipeline filter 18, a heater 20, a diesel magnetic drive pump 22; The outlet of the sewage metering pump 1 is divided into two branches, the main branch is connected to the heater inlet 21 in series with the first flow meter and the first check valve in sequence, and the secondary branch is connected to the three-phase separation through the first gate valve The lower part of the tank 4; the inlet of the pad liquid line is respectively connected to the inlet of the sewage metering pump 1 through the second gate valve and connected to the bottom of the three-phase separation tank through the third gate valve; the top outlet of the three-phase separation tank 4 is sequentially connected to the first pressure control valve and the cooler 11 1. The upper part of the cyclone separator 9 is connected to the inlet of the circulating gas screw compressor 12, and its outlet is divided into two paths, one path is connected with the second check valve through the fourth gate valve, and the other path is connected with the fifth gate valve, the first temperature control valve and the second one-way valve. Two one-way valve inlets are connected; the second one-way valve outlet is divided into two branches, the main branch is connected to the heater outlet 19 through the second flowmeter, and the secondary branch is respectively connected to the three-phase separation tank 4 through the first flow control valve The upper part of the foam breaking net and the waste gas discharge port 13 are connected through the second pressure control valve; the second flow meter of the main branch is connected with the nitrogen inlet 14 through the sixth gate valve before; the lower end of the breaking foam net of the three-phase separation tank 4 is provided with two Two inlets, one outlet, the outlet is connected to the inlet of the diesel magnetic drive pump 22 through the seventh gate valve; the outlet of the diesel magnetic drive pump 22 is divided into two routes, one through the third one-way valve, the third flow meter, and the second flow control valve The other is connected to the inlet of the heater, and the other is connected to the first inlet of the middle part of the three-phase separation tank 4 through the eighth gate valve; the heater outlet 19 is connected to the pipeline filter 18 and the inlet of the test piece 17 in turn; the outlet of the test piece 17 passes through the first The four flowmeters, the third flow control valve, the metal hose 16 are connected with the return pipe 15, and the return pipe 15 is connected with the second inlet in the middle part of the three-phase separation tank 4.

Described three-phase separating tank 4 upper part gas phase and the middle part oil phase are provided with foam breaking net 5, and foam breaking material is stainless steel; Set liquid level meter 2 between middle part oil phase and lower part water phase; Three-phase separating tank bottom to A boundary gauge 3 is provided at the bottom, and a safety valve 6 is provided at the top of the three-phase separation tank.

The cyclone separator 9 is composed of two parts, the upper part is a separation tank, the lower part is a pressure tank, and the middle part is connected by a pipeline communication valve 10; The bottom of the tank is connected to the lower part of the three-phase separation tank through the ninth gate valve.

The other outlet of the test piece 17 is connected through the fifth flowmeter, the fourth flow control valve and the return pipeline 15 .

The test piece 17 adopts the structure of tee, elbow, big and small head, and liner, and the material of the test piece is carbon steel.

The three phases in the three-phase separation tank 4 are gas phase, oil phase and water phase, that is, nitrogen, diesel oil and sulfur-containing sewage respectively.

Working process of the present utility model:

Install the erosion test device, modify the test system flow, close the third gate valve, open the first and second gate valves, and pump the sulfur-containing sewage from the inlet 23 of the pad liquid line to the three-phase separation tank 4 through the sewage metering pump 1 to reach the boundary. Stop after 60% of the level gauge 3, then change the diesel oil from the pad liquid line inlet 23 into the three-phase separation tank 4, pump to 80% of the liquid level gauge 2, and close the second gate valve at the pad liquid line inlet 23 in time; open the first The eight-gate valve is used to press high-pressure nitrogen into the test system through the nitrogen inlet 14, so that the gauge pressure of the three-phase separation tank 4 reaches 0.2Mpa, and the eighth gate valve is closed.

Open the third gate valve, adjust the load of the sewage metering pump 1 to zero, and then start the sewage metering pump; open the seventh gate valve, close the eighth gate valve and the second flow control valve, and then start the diesel magnetic drive pump 22, slightly open the eighth The gate valve establishes a short-circuit cycle back to the three-phase separation tank 4; closes the first pressure control valve at the top of the cyclone separator 9 and the fourth and fifth gate valves at the outlet of the cycle gas compressor 12 to control the pressure of the cyclone separator 9 close to normal pressure. Fully open the first flow control valve at the outlet of the circulating air screw compressor 12, start the circulating air screw compressor 12, immediately open the fourth and fifth gate valves of the circulating air screw compressor 12, and use the first pressure before the cooler 11 in time The control valve and the first flow control valve at the outlet of the recycle gas compressor 12 ensure that the inlet pressure of the cyclone separator 9 is normal pressure.

Set the industrial computer to ensure that the ratio of water phase, oil phase and gas phase is consistent with the actual working conditions. By increasing the load of the sulfur-containing sewage metering pump 1 , the openings of the flow control valves of diesel and nitrogen are adjusted to realize equal-proportion increase of the three phases. The load of the heater 20 is adjusted according to the requirements of the test temperature, and the load of the cooler 11 is adjusted according to the temperature at the inlet of the compressor.

During operation, with the increase of the condensed oil level in the cyclone separator 9, an alarm signal is sent through the liquid level alarm device 8, and the pipeline communication valve 10 between the pressure tank and the separation tank is opened, and the condensed oil is automatically introduced into the pressure tank , close the communication valve, open the ninth gate valve between the pressure tank and the three-phase separation tank 4, slowly introduce high-pressure nitrogen through the nitrogen inlet 7 to pressurize the condensed oil, and close the nitrogen inlet valve.

During the test, for the test pieces such as elbows, big and small heads, and liners, the fifth flowmeter and the fourth flow control valve at the outlet of the test piece are closed, and the other outlet of the test piece is controlled by the fourth flowmeter and the third flow control valve. The valve, the metal hose 16 and the return main pipe 15 are connected to return to the second inlet of the three-phase separation tank 4 . For the three-way test piece, the test flow requirements are realized under the control of the industrial computer through two-way flowmeters and flow control valves.

During the test, the temperature of the system may rise as the temperature changes. In case the pressure control system fails, when the pressure of the three-phase separation tank 4 exceeds the specified value, the top safety valve of the three-phase separation tank 4 will jump to ensure the safety of the system.

Claims (6)

1. a loop-type multi-phase flow erosion test device is characterized in that: comprise Sewage metering pump (1), three phase separation jar (4), cyclone separator (9), refrigeratory (11) and circulating air screw compressor (12), line strainer (18), well heater (20), diesel oil magnetic drive pump (22); Wherein Sewage metering pump (1) endpiece is divided into two branch roads, and main branch road is connected with first flow meter, first retaining valve successively and received well heater import (21), and inferior branch road connects three phase separation jar (4) bottom through first gate valve; The import of pad liquidus connects the import of Sewage metering pump (1) respectively and connects the three phase separation pot bottom through the 3rd gate valve through second gate valve; Three phase separation jar (4) top exit connects the import of circulating air screw compressor (12) successively with first pressure control valve, refrigeratory (11), cyclone separator (9) top, its outlet is divided into two-way, one the tunnel connects with second retaining valve through the 4th gate valve, and another Lu Jingdi five gate valves, first temperature control valve connect with second check valve inlet; The outlet of second retaining valve is divided into two branch roads, and main branch road connects heater outlet (19) through second flowmeter, and inferior branch road connects the demister top of three phase separation jar (4) respectively and connects Waste gas outlet (13) through second pressure control valve through the first flow operation valve; Link by the 6th gate valve and nitrogen inlet (14) before wherein main branch road second flowmeter; Two imports are established in the demister lower end of three phase separation jar (4), and an outlet, outlet connect the import of diesel oil magnetic drive pump (22) through the 7th gate valve; The outlet of diesel oil magnetic drive pump (22) is divided into two-way, and one the tunnel connects the well heater import through the 3rd retaining valve, the 3rd flowmeter, second flowrate control valve, and another road links by the 8th gate valve and three phase separation jar (4) middle part first import; Heater outlet (19) links with line strainer (18) and test specimen to be measured (17) import successively; Test specimen to be measured (17) outlet links through the 4th flowmeter, the 3rd flowrate control valve, metal hose (16) and reflux line (15), and reflux line (15) connects three phase separation jar (4) middle part second import.

2. a kind of loop-type multi-phase flow erosion test device according to claim 1 is characterized in that: be provided with demister (5) between described three phase separation jar (4) upper gaseous phase and the middle part oil phase, broken foam material is a stainless steel; Establish liquid level gauge (2) between middle part oil phase and the lower aqueous; Interfacial meter (3) is established in three phase separation jar bottom to the bottom, safety valve (6) is set up in the three phase separation tank top.

3. a kind of loop-type multi-phase flow erosion test device according to claim 1 is characterized in that: described cyclone separator (9) is made up of two parts, and top is separating tank, and the bottom is a head tank, and the middle part connects by pipeline communicating valve (10); Liquid level alarm device (8) is set up in the separating tank bottom, and a nitrogen inlet (7) is left at the head tank top, and the head tank bottom connects three phase separation jar bottom through the 9th gate valve.

4. a kind of loop-type multi-phase flow erosion test device according to claim 1 is characterized in that: another outlet of described test specimen to be measured (17) links through the 5th flowmeter, the 4th flowrate control valve and reflux line (15).

5. a kind of loop-type multi-phase flow erosion test device according to claim 1 is characterized in that: described test specimen to be measured (17) adopts threeway, bend pipe, concentric reducer, bushing pipe structure, and material for test is a carbon steel.

6. a kind of loop-type multi-phase flow erosion test device according to claim 1 is characterized in that: the three-phase in the described three phase separation jar (4) is gas phase, oil phase, water, promptly is respectively nitrogen, diesel oil, sour water.

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