CN113952794A

CN113952794A - Multistage steam-water separation device and method

Info

Publication number: CN113952794A
Application number: CN202111067138.XA
Authority: CN
Inventors: 李世瑞; 韩东; 汪胜; 何纬峰; 高斯杰; 王瑾程
Original assignee: Nanjing University of Aeronautics and Astronautics
Current assignee: Nanjing University of Aeronautics and Astronautics
Priority date: 2021-09-10
Filing date: 2021-09-10
Publication date: 2022-01-21

Abstract

A multistage steam-water separation device and a method belong to the technical field of chemical equipment. The method is characterized in that: including filters and separators. The filter consists of a curved flow passage, a bypass flow passage, a filter screen and an end cover at one end and is used for preventing dirt from blocking the separator. The fluid enters from the left, dirt in the fluid is deposited at the end of the meandering channel, and clean fluid passes through the screen into the separator. The central main flow channel of the separator consists of two pores and an expansion cavity, the separator is connected with a fluid pipeline and a filter through flanges, and steam-water separation is realized by utilizing the resistance difference of the steam phase and water flowing through the pores of the throat and the flash evaporation effect of the water. The invention provides a method for realizing the separation of two phases of steam and water by controlling the passing rate of gas-phase fluid through pores and multistage expanding flow channels. The multistage steam-water separation device is compact in structure, is only composed of the filter and the separator, is simple in structure, does not have moving parts, improves the stability of operation, reduces the probability of generating faults, and prolongs the service life.

Description

Multistage steam-water separation device and method

Technical Field

The invention relates to a multistage steam-water separation device and method, and relates to the technical field of chemical equipment.

Background

The existing steam-water separation technology is usually to use a steam-water separator for separation, and the existing steam-water separators are various and have the results of baffle type, centrifugal type, rotational flow type, gravity type and the like. The steam-water two phases are separated by gravity or centrifugal force, but the steam-water separation device is usually overlarge in size, and is usually separated by connecting a separation tank or a cyclone device behind a pipeline, so that the manufacturing cost is high, and meanwhile, when water is discharged, the water cannot be discharged and closed freely, so that the situations of air leakage and water leakage are caused. Therefore, a multistage steam-water separation device which can be connected with a pipeline, has small volume, simple structure, no moving parts, stability and long service life needs to be researched.

Disclosure of Invention

The invention relates to a multistage steam-water separation device and a multistage steam-water separation method.

The multistage steam-water separation device is characterized in that:

the multi-stage steam-water separation device comprises a filter and a separator; said filter comprising a tortuous flow path; an end cover is arranged at the tail end of the bent flow passage; a bypass flow passage is arranged on the side of the bent flow passage; the first end of the bypass flow passage is connected with the bent flow passage, and a filter screen is arranged between the first end of the bypass flow passage and the bent flow passage;

the center of the separator is a main flow channel, and the main flow channel sequentially comprises a first pore, a first expansion cavity, a second pore and a second expansion cavity from a first end to a second end;

the cross section of the second expansion cavity is larger than that of the first expansion cavity;

the cross sections of the first expanding cavity and the second expanding cavity are larger than the cross sections of the first pore and the second pore;

the first pores and the second pores are each of a laval structure in which an area at a minimum throat section is determined by the following equation:

wherein Q is the flow volume, rho is the density of the fluid, zeta is the total resistance coefficient at two ends of the corresponding pore, and delta P is the pressure difference at two ends of the corresponding pore;

the second end of the bypass flow channel is connected with the first end of the separator (4) through a flange.

The steam-water separation method of the multistage steam-water separation device is characterized by comprising the following steps:

the gas-liquid two-phase mixture flows into the bent flow passage from the first end of the filter, dirt in the fluid is deposited at the tail end of the bent flow passage and is discharged by the end cover, and clean fluid enters the bypass flow passage through the filter screen.

The second end of the bypass flow channel is connected with the first end of the separator through a flange, and a clean gas-liquid two-phase mixture enters a main flow channel of the separator and flows through the first fine holes and the first expansion cavity and the second fine holes and the second expansion cavity to perform primary separation and secondary separation.

The invention has the following effective effects: the multistage steam-water separation device realizes steam-water separation through the structural design of a flow passage. The first pore in the flow channel can realize the separation of steam and water according to the difference of the density of steam and water, namely the difference of the resistance of flowing through the pore, and simultaneously the liquid phase is subjected to flash evaporation in the first expansion cavity to generate back pressure, thereby further preventing the gas phase in front of the pore from flowing through. The second pore can more effectively restrict the gas phase to flow through, in order to make the downstream flash distillation can establish suitable backpressure, the cross-section of second enlarged cavity needs to be bigger than first enlarged cavity, and second pore and second enlarged cavity play secondary separation's effect, make the steam-water separation effect more showing. Moving parts do not exist in the structure of the multi-stage steam-water separation device, the probability of faults is reduced, the service life is as long as decades, and the multi-stage steam-water separation device has great advantages.

Drawings

FIG. 1 is a schematic view of a multi-stage steam-water separation plant;

FIG. 2 is a schematic diagram of the separator;

number designation in the figures: 1 filter, 2 filter screens, 3 flanges, 4 separators, 5 end covers, 6 first expansion cavities and 7 second expansion cavities

Detailed Description

The operation of a multi-stage steam-water separation apparatus will be described with reference to fig. 1.

The filter (1) is connected with the separator (4) through flanges, two sides of the filter are respectively welded with one flange (3) and fixedly arranged in a fluid pipeline through the flanges, and fluid flows through the device from left to right.

As shown in fig. 1, the central main flow channel of the separator (4) is composed of two fine holes and two expansion chambers, water can flow through the fine holes preferentially due to the difference of fluid resistance of the vapor phase and the water, while the vapor phase is blocked at the left side, and the liquid phase is flashed in the expansion chambers, so that the vapor phase is further prevented from flowing through before the fine holes. The steam and water are separated by the two-stage pores and the expansion cavity.

Through the mode, the multistage steam-water separation device realizes steam-water separation through the structural design of the flow channel. Rely on the resistance difference and the flash distillation effect of pore of flowing through to realize the separation of soda, do not have in the structure and move the part, reduced the probability that the trouble takes place, long service life reaches several decades, has very big advantage.

Claims

1. The utility model provides a multistage catch water which characterized in that:

comprises a filter (1) and a separator (4);

said filter (1) comprises a tortuous flow path; an end cover (5) is arranged at the tail end of the bent flow channel; a bypass flow passage is arranged on the side of the bent flow passage; the first end of the bypass flow passage is connected with the bent flow passage, and a filter screen (2) is arranged between the first end and the bent flow passage;

the center of the separator (4) is a main flow channel which is provided with a first pore, a first expansion chamber (6), a second pore and a second expansion chamber (7) from a first end to a second end in sequence;

the cross section of the second expansion chamber (7) is larger than that of the first expansion chamber (6);

the cross sections of the first expanding cavity (6) and the second expanding cavity (7) are larger than the cross sections of the first pore and the second pore;

2. The steam-water separation method of a multi-stage steam-water separation device according to claim 1, characterized by comprising the following steps:

the gas-liquid two-phase mixture flows into the bent flow channel from the first end of the filter (4), dirt in the fluid is deposited at the tail end of the bent flow channel and is discharged by using the end cover (5), and clean fluid enters the bypass flow channel through the filter screen (2);

the second end of the bypass flow channel is connected with the first end of the separator (4) through a flange, and a clean gas-liquid two-phase mixture enters a main flow channel of the separator (4) and flows through the first fine holes and the first expansion cavity (6) and the second fine holes and the second expansion cavity (7) to be subjected to primary separation and secondary separation.