CN210920495U - Entrained flow coal gasification black water flash evaporation wear-resistant three-way pipe - Google Patents

Abstract

The utility model relates to a coal gasification entrained flow bed accessory specifically is the wear-resisting three-way pipe of entrained flow coal gasification black water flash distillation, solves current three-way pipe and easily forms the air current swirl under entrained flow coal gasification black water flash distillation environment, and the inner wall easily grinds the problem that loses the leakage, the scheme: the three-way pipe comprises a three-way pipe body, wherein the upper port of the vertical section of the three-way pipe body is an inlet, the lower part of the vertical section of the three-way pipe body is a sealed buffer section, and the port of the horizontal section of the three-way pipe body is an outlet; the inner diameters of the sections are the same, and the length of the buffer section is not less than the inner diameter of the pipe. The advantages are that: 1. the structure is simple, and only the length of the buffer segment is modified; 2. the inner wall is sprayed with the wear-resistant layer, so that the wear resistance of the inner wall is greatly enhanced; 3. the utility model discloses the region of intersecting of wear-resisting three-way pipe forms air current swirl small in quantity, and the air current swirl velocity of flow is low, and the geminate transistors inner wall abrasion is little, and the difficult abrasion inner wall causes the leakage, has prolonged reliable operating duration greatly, and not only the security improves, and manufacturing cost also reduces thereupon, reduces the frequency of shutting down the maintenance and changing.

Description

Entrained flow coal gasification black water flash evaporation wear-resistant three-way pipe

Technical Field

The utility model relates to a coal gasification entrained flow bed accessory, in particular to a coal gasification black water flash evaporation wear-resistant three-way pipe of an entrained flow bed.

Background

The ash (black) water system plays a role in recycling the coal gasification heat of the entrained flow bed, treating black water and the like, is the key of long-period stable operation of coal gasification, but has severe working conditions due to the existence of gas, liquid and solid three phases, so that the problem of equipment pipelines is easily caused. Especially, after the black water discharged from the gasification furnace and the synthesis gas washing tower is decompressed by the pressure reducing valve, the black water carrying particulate matters is quickly vaporized, and the coexistence of flash steam, acid gas, solid particles and the black water occurs. Researches show that due to the fact that the existing three-way pipe is unreasonable in structural design, airflow vortexes are formed in intersecting areas inside the three-way pipe, and acidic gas, flash evaporation gas mixed with solid particles and black water continuously impact the pipe wall, so that the inner wall of the pipe body is seriously abraded and leaks. The coal gasification system is difficult to process online after abrasion and leakage occur, and the coal gasification system must be stopped for processing, thereby affecting the long-term operation of the coal gasification system. Therefore, it is necessary to design a wear-resistant three-way pipe suitable for being connected and used in the entrained flow coal gasification black water flash evaporation environment.

Disclosure of Invention

The utility model provides a current three-way pipe under entrained flow coal gasification black water flash distillation environment the three-way pipe passes through the region and forms the air current swirl easily, and the gas mixture leads to the problem of leaking to the erosion easily causes the tee bend inside pipe wall, provides a wear-resisting three-way pipe of entrained flow coal gasification black water flash distillation.

The utility model discloses a realize through following technical scheme: the entrained-flow coal gasification black water flash evaporation wear-resistant three-way pipe comprises a three-way pipe body, wherein a speed inlet is arranged at the upper port of a vertical section of the three-way pipe body, a closed buffer section is arranged at the lower part of the vertical section of the three-way pipe body, and a pressure outlet is arranged at the port of a horizontal section of the three-way pipe body; the method is characterized in that: the vertical section of the three-way pipe body is the same as the pipe inner diameter of the horizontal section, and the length of the buffer section (namely the vertical distance from the lower port of the buffer section to the pipe inner wall of the horizontal section) is not less than the pipe inner diameter. Through a large number of three-way pipe simulation tests with different pipe diameter ratios and different section length ratios, the number of formed air flow vortexes in the three-way pipe and the air flow vortex flow rate are mainly related to the ratio of the length of the buffer section to the inner diameter of the three-way pipe, and when the ratio of the length of the buffer section to the inner diameter of the three-way pipe is not less than 1, namely the length of the buffer section is greater than or equal to the inner diameter of the three-way pipe, the number and the strength of vortexes formed in the buffer zone can be reduced. Although the abrasion to the inner wall of the three-way pipe can be reduced by increasing the length of the buffer zone, the problems of installation height and pipe diameter of the three-way pipe and installation and matching of adjacent furnace pipelines are comprehensively considered, and the pipe inner diameter of the three-way pipe cannot be increased by increasing the length of the buffer zone without limit. When the wear-resistant rubber tube is used specifically, when the ratio of the length of the buffer segment to the inner diameter of the tube is larger than or close to 1, the economical efficiency and the wear resistance are optimal.

The inner wall of the three-way pipe body is sprayed with an inner lining wear-resistant layer made of rare earth alloy. The inner wall of the three-way pipe body is sprayed with the lining wear-resistant layer made of rare earth alloy, so that the wear resistance of the inner wall can be enhanced.

The utility model has the advantages of it is following: 1. the structure is simple, and only the length of the buffer segment at the lower end of the existing three-way pipe needs to be modified; 2. the inner wall is sprayed with the wear-resistant layer, so that the wear resistance of the inner wall is greatly enhanced; 3. the utility model discloses the region of intersecting of wear-resisting three-way pipe forms air current swirl small in quantity, and the air current swirl velocity of flow is low, and the geminate transistors inner wall abrasion is little, and the difficult abrasion inner wall causes the leakage, has prolonged reliable operating duration greatly, and not only the security improves, and manufacturing cost also reduces thereupon, reduces the frequency of shutting down the maintenance and changing.

Drawings

FIG. 1 is a schematic structural view of the present invention;

fig. 2 is a fluid trajectory plot of the center section of the first embodiment (D =300mm, L1=450mm, L2=800mm, L3=450 mm);

FIG. 3 is a center section velocity profile of an embodiment; as can be seen from fig. 2 and 3, the fluid does not substantially enter the buffer section at the lower part of the tee, and after entering the intersecting region, the fluid directly flows to the pressure outlet, and forms a vortex region at the upper part of the horizontal section, wherein particles can continuously impact the pipe wall in the intersecting region and the vortex region of the tee under the carrying effect of the fluid, so that serious abrasion is caused;

FIG. 4 is a pressure cloud of a center cut plane according to an embodiment; as can be seen from fig. 2 and 4, a high pressure area is formed in the three-way buffering section, so that the fluid entering the area flows at a reduced speed, and a vortex with a speed far lower than that of the main flow is formed in the buffering section, so that the particles can not seriously abrade the inner wall of the buffering section;

FIG. 5 is a graph of the fluid trajectory of the center cut plane of example two (D =300mm, L1=100 mm);

FIG. 6 is a center section velocity profile of the second embodiment; as can be seen from fig. 5 and 6, the fluid enters the lower buffer section of the three-way pipe and forms a plurality of vortex areas in the three-way pipe, and particles can continuously impact the inner wall at the buffer section and the plurality of vortex areas of the three-way pipe under the carrying effect of the fluid, so that severe abrasion is caused;

fig. 7 is a center cut fluid trajectory plot of example three (D =300mm, L1=200 mm);

FIG. 8 is a velocity profile of a three-center tangential plane according to an embodiment;

fig. 9 is a fluid trace plot of the center cut plane of example four (D =300mm, L1=300 mm);

FIG. 10 is a velocity profile of a four-center section according to an embodiment; comparing the central tangent plane fluid trajectory graph and the central tangent plane velocity profile of the second embodiment, the third embodiment and the fourth embodiment shows that as the length of the buffer zone increases, the number and the intensity of vortexes in the buffer section of the vertical section of the three-way pipe gradually decrease, so that the abrasion of the inner wall of the pipe is reduced; the fourth embodiment is more ideal in the number and the strength of the vortex zones compared with the other embodiments;

wherein: 1-speed inlet, 2-buffer section, 3-pressure outlet, L1-buffer section length, L2-speed inlet section length, L3-pressure outlet section length and D-pipe inner diameter.

Detailed Description

The entrained-flow bed coal gasification black water flash evaporation wear-resistant three-way pipe comprises a three-way pipe body, wherein a speed inlet 1 is arranged at an upper port of a vertical section of the three-way pipe body, a closed buffer section 2 is arranged at the lower part of the vertical section of the three-way pipe body, and a pressure outlet 3 is arranged at a horizontal section of the three-way pipe body; the method is characterized in that: the vertical section of the three-way pipe body is the same as the pipe inner diameter D of the horizontal section, and the length L1 of the buffer section (namely the vertical distance from the lower port of the buffer section to the pipe inner wall of the horizontal section) is not less than the pipe inner diameter D.

When the three-way pipe is specifically implemented, the inner wall of the three-way pipe body is sprayed with a lining wear-resistant layer made of rare earth alloy.

The first embodiment is as follows: the inner diameter D of the pipe is =300mm, the lengths of the sections of the tee pipe are respectively L1=450mm, L2=800mm and L3=450 mm;

the center section fluid trajectory graph of the first embodiment is shown in fig. 2, the center section velocity profile graph is shown in fig. 3, and the center section pressure cloud graph is shown in fig. 4. As can be seen from fig. 2 and 3, the fluid does not substantially enter the buffer section at the lower part of the tee, and after entering the intersecting region, the fluid directly flows to the pressure outlet, and forms a vortex region at the upper part of the horizontal section, wherein particles can continuously impact the pipe wall in the intersecting region and the vortex region of the tee under the carrying effect of the fluid, so that serious abrasion is caused; as can be seen from fig. 2 and 4, a high pressure region is formed in the three-way buffering section, so that the fluid entering the region is decelerated and swirls with a velocity much lower than that of the main flow are formed in the buffering section, and particles will not seriously abrade the inner wall of the buffering section.

Example two: the inner diameter of the pipe is D =300mm, the lengths of the sections of the tee are L1=100mm, L2=800mm and L3=450mm respectively.

The center section fluid trajectory diagram of the second embodiment is shown in fig. 5, and the center section velocity profile diagram is shown in fig. 6; as can be seen from the two figures of fig. 5 and 6, the fluid enters the lower buffering section of the three-way pipe and forms a plurality of swirl areas in the three-way pipe, and particles can continuously impact the inner wall at the buffering section and the plurality of swirl areas of the three-way pipe under the carrying effect of the fluid, so that serious abrasion is caused.

Example three: the inner diameter of the pipe is D =300mm, the lengths of the sections of the tee are L1=200mm, L2=800mm and L3=450mm respectively.

The center section fluid trajectory diagram of the third embodiment is shown in fig. 7, and the center section velocity profile diagram is shown in fig. 8.

Example four: the inner diameter of the pipe is D =300mm, the lengths of the sections of the tee are L1=300mm, L2=800mm and L3=450mm respectively.

The center section fluid trajectory diagram of the fourth embodiment is shown in fig. 9, and the center section velocity profile diagram is shown in fig. 10; comparing the central tangent plane fluid trajectory graph and the central tangent plane velocity profile of the second embodiment, the third embodiment and the fourth embodiment shows that as the length of the buffer zone increases, the number and the intensity of vortexes in the buffer section of the vertical section of the three-way pipe gradually decrease, so that the abrasion of the inner wall of the pipe is reduced; the fourth embodiment is more ideal in the number and intensity of the vortex zones than the other embodiments.

Will the embodiment of the utility model discloses a four structure three-way pipes actually drop into high-pressure flash distillation entrance and use two years, do not appear because of the leakage that erodees, cavitation caused. The frequency of forced parking caused by leakage on-line failure is greatly reduced, the production cost is effectively saved, and the method has high economical efficiency and practicability.

Claims (3)

1. An entrained flow coal gasification black water flash evaporation wear-resistant three-way pipe comprises a three-way pipe body, wherein a speed inlet (1) is arranged at an upper port of a vertical section of the three-way pipe body, a closed buffer section (2) is arranged at the lower part of the vertical section of the three-way pipe body, and a pressure outlet (3) is arranged at a horizontal section port of the three-way pipe body; the method is characterized in that: the vertical section of the three-way pipe body is the same as the pipe inner diameter (D) of the horizontal section, and the length (L1) of the buffer section is not smaller than the pipe inner diameter (D).

2. The entrained-flow coal gasification black water flash evaporation wear-resisting three-way pipe of claim 1, characterized in that: the inner wall of the three-way pipe body is sprayed with an inner lining wear-resistant layer made of rare earth alloy.

3. The entrained flow coal gasification black water flash evaporation wear-resistant three-way pipe according to claim 1 or 2, characterized in that: the buffer segment length (L1) is equal to the tube inner diameter (D).

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