JPH0664707U - Gas-liquid separation device - Google Patents

Abstract

(57) [Summary] [Purpose] The objective is to ensure sufficient gas-liquid separation performance and to make the outer diameter compact. [Composition] High-dryness fluid flows in from the upper pipe, low-dryness fluid flows in from the lower pipe, and is separated into gas and liquid inside, and gas is discharged upward and liquid is discharged downward. The interior of the gas-liquid separation device is divided into a pipe provided in the upper portion and a pipe provided in the lower portion so as to be partially conductive by a partition plate.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a gas-liquid separation device applied to a boiler or the like in a thermal power plant.

[0002]

[Prior art]

 FIG. 2 is an explanatory diagram of a flash pipe (also called a flash tank, a blow tank, etc.) used for gas-liquid separation in a boiler or the like in a thermal power plant. In the figure, when the outside of the system is blown from the steam system which is the main cycle of the boiler, basically all of it is blown into the flash pipe 1 and almost atmospheric pressure occurs in the flash pipe 1. The steam is sent to the atmosphere via the exhaust pipe 9 and the drain is sent to the waste water treatment device via the drain pipe 7. Fluid to be blown to the flash pipe 1 is continuous blow of drum water, outside blow of feed water heater drain, outside blow of steam type air preheater drain, steam for steam pipe warm-up at boiler startup. In addition to the fluid blown during the operation of the thermal power plant, such as external blow at the time of high water level such as drain, drum and deaerator, there is also the full blow of the retained water at the time of draining the boiler. The pressure, temperature, flow rate, etc. of the inflowing fluid are very wide.

In this way, steam, drain, or mixed fluid of these with various pressures and temperatures flows into the flash pipe 1 and is depressurized to near atmospheric pressure, and the vaporized fluid becomes drain to the atmosphere. The fluid is sent to the wastewater treatment device, but the flash pipe 1 flows into the flush pipe 1 in such a manner that it is necessary to separate the fluid in various states into steam and drain. There are various methods such as creating a swirling flow to separate water and water by the difference in specific gravity, and providing sufficient space in the flash pipe 1 to sufficiently reduce the flow velocity of steam in the flash pipe 1 to separate water and water. Or, they are used in combination.

[0004]

[Problems to be solved by the device]

 As described above, fluids of various pressures and temperatures, such as steam and drain, flow into the flash pipe 1, and it is necessary to effectively separate water and water from these fluids. However, for warming up the steam pipe, The fluid to be blown flows into the flash pipe 1 as drain water in the early stage of warming up because heat is taken by the warming up of the steam pipe, and when warming up is performed to some extent, it is saturated steam or flash pipe 1 as superheated steam. Flows in. In addition, there are also those that flow in as a gas-liquid two-phase flow with a low degree of dryness, such as continuous blow from a drum, and this is effectively separated into steam and water by one flash pipe 1, and the drain water in the flash pipe 1 is If the flow velocity of the steam in each part of the flash pipe 1 is kept within a predetermined flow velocity so as not to re-scatter on the steam side, the volume is generally very large in many cases. In addition, when the performance of separating water and water in the flash pipe 1 is not sufficient, drain water may be released together with steam to the atmosphere via the exhaust pipe and may rain.

[0005]

[Means for Solving the Problems]

 The gas-liquid separation device according to the present invention is intended to solve the above-mentioned problems, and a fluid of high dryness flows in from a pipe provided in the upper part and a fluid of low dryness flows in from a pipe provided in a lower part. In the gas-liquid separation device, the inside is partially separated between the above-mentioned pipe provided at the upper part and the above-mentioned pipe at the lower part. It is characterized in that it is provided with a partition plate which is divided into upper and lower parts so that it can be electrically connected to.

[0006]

[Action]

 That is, in the gas-liquid separation device according to the present invention, the fluid of high dryness flows in from the upper pipe and the fluid of low dryness flows in from the pipe provided in the lower part, and is internally separated into gas and liquid. The gas is discharged upward and the liquid is discharged downward.The interior of the gas-liquid separation device is divided by a partition plate between the pipe installed in the upper part and the pipe installed in the lower part so that it can be partially connected. Since the inside is divided into upper and lower areas by the plate, even if the fluid of high dryness and the fluid of low dryness flow into the gas-liquid separator at the same time, the fluid of high dryness and the fluid of low dryness are separated. The gas-liquid separation is performed without affecting each other, and the gas generated from the fluid of high dryness flowing into the upper area is discharged upward, and the liquid is guided into the lower area and flows into the lower area. Generated from low dryness fluid That the gas liquid is discharged upward is discharged downward together with the liquid derived from the top of the area.

[0007]

【Example】

 FIG. 1 is an illustration of a flash pipe according to an embodiment of the present invention. In the figure, the flash pipe according to the present embodiment is used for gas-liquid separation in a boiler or the like in a thermal power plant, and when blowing from the steam system, which is the main cycle of the boiler, to the outside of the system, In general, all of the steam blown to the flash pipe 1 at almost atmospheric pressure inside the flash pipe 1 is discharged to the atmosphere via the exhaust pipe 9, and the drain is discharged to the waste water via the drain pipe 7. Sent to the device. Fluids blown to the flash pipe 1 include continuous blow of drum water, external blow of feed water heater drain, external blow of steam type air preheater drain, steam for warming up the steam pipe at boiler startup, and In addition to the fluid blown during the operation of the thermal power plant, such as external blow at the time of high water level such as drain, drum, deaerator, etc., there is also the total blow of the retained water at the time of draining the boiler. The pressure, temperature, flow rate, etc. of the entering fluid are very wide.

Inside the flash pipe 1, an upper area 3 where the steam pipe worming line 2 or the like into which the fluid of high dryness flows is connected and a continuous blow line 5 or the like where the fluid of low dryness flows into. It is divided into a lower area 6 and a partition plate 4 provided between them to divide both areas. The partition plate 4 is provided with holes 12 so that the drain flowing down from the upper area 3 is guided into the lower area 6. The fluid flowing from the steam pipe warming line 2 into the flash pipe 1 has a large amount of drainage in the early stage of warming up, but as the warming up progresses, the steam also flows in, and when the warming up is almost completed, only the steam flows. Will come in. Therefore, in the initial stage of warming up, the drain or the drain and the steam flow into the upper area 3, where the steam generated by the water-water separation is discharged to the atmosphere via the exhaust pipe 9, and the drain is partitioned. It is guided into the lower area 6 through the hole 12 provided in the plate 4 and is accumulated as drain. The fluid in the continuous drum blow line 5 flowing into the lower area 6 has a low degree of dryness, and the proportion of vapor generated is smaller than that of the fluid introduced into the upper area 3. The steam separated from water in the lower area 6 is guided to the exhaust pipe 9 through the guide pipe 10 and discharged to the atmosphere. The drain which occupies most of this fluid forms a drain level in the lower area 6 and is stored, and is discharged from the drain pipe 7 to the waste water treatment equipment. Since the partition plate 4 is provided between the upper area 3 and the lower area 6, the steam flowing from the steam pipe warming line 2 does not affect the vapor-water separation action of the lower area 6 and the exhaust pipe 9 Released into the atmosphere. As a result, the drain, which occupies most of the water after being separated from water and water by flowing from the continuous drum blow line 5 into the lower area 6, is carried away by the steam flowing from the steam pipe warming line 2, and the drain from the exhaust pipe 9 is removed. It is prevented from scattering like rain.

In the conventional flash pipe, the fluid blown for warming up the steam pipe flows into the flash pipe as drain water in the early stage of warming up because the heat is removed by the warming up of the steam pipe, and the fluid is warmed to some extent. When it is heated up, it flows into the flash pipe as saturated steam or superheated steam. In addition, there are also those that flow in as a gas-liquid two-phase flow with a low degree of dryness, such as continuous blow from a drum, and if it is attempted to effectively separate water and water with one flash pipe 1, it will be highly dry in the same space. Both the high-temperature fluid and the low-dryness fluid flow in and are affected by each other, and a large amount of steam that flows in from the steam pipe warming line and a large amount of saturated drain that flows in from the continuous drum blow line are in the same space. Since it will be mixed, the possibility that the drain water will be carried away by the steam and will be scattered like rain will increase the flow velocity of the steam in each part of the flash pipe to prevent the drain water in the flash pipe from re-scattering to the steam side. If the flow rate is kept within a predetermined flow rate, the volume is generally very large in many cases. In addition, if the water-water separation performance of the flash pipe is not sufficient, drain water may be released to the atmosphere via the exhaust pipe together with steam, resulting in a rainy state, but with this flash pipe 1, In order to have sufficient water-water separation performance and to be dimensionally compact, the fluid flowing into the flash pipe 1 is first classified according to its dryness, and the inside of the flash pipe 1 is divided into steam pipes. Like the blow at the time of warming up, even if the gas-liquid two-phase fluid of drain water or steam and drain water flows in at the initial stage of warming up, the high dryness fluid that flows in as steam then flows in the upper area 3, By dividing into a lower area 6 where gas / liquid two-phase fluid with low dryness or drain water flows in like continuous blow from a drum It is obtained having a performance sufficient steam-water separator with a compact size it is possible to structure corresponding to each condition. However, if the flash pipe 1 has a double structure inside and outside, and is composed of a part for high-dryness fluid and a part for low-dryness, the flash pipe is inevitably due to the double structure inside and outside. There is a structural upper limit even if the diameter of 1 becomes large due to the internal structure and tries to make it smaller, but this is targeted at the part for high dryness and the target for low dryness so as to become a more compact dimension. By arranging the parts not in the double structure of the inside and outside but in the upper and lower parts, the diameter of the flash pipe 1 is reduced, and the flash pipe 1 having sufficient performance of separating water and water becomes possible. In this way, by arranging each area vertically, the outer diameter of the flash pipe 1 can be remarkably reduced, which is a great advantage in terms of space and cost. Furthermore, it is possible to provide three or more areas of fluid flowing into the flash pipe 1 and to provide corresponding areas, and by arranging these areas vertically, the outer diameter of the flash pipe 1 can be increased. The flash pipe 1 can be made compact without increasing the size.

As described above, by arranging the area into which the fluid of high dryness flows into the upper portion of the flash pipe 1 and the area into which the fluid of low dryness flows into the lower portion thereof, the upper portion of the flash pipe 1 becomes a steam pipe. It is possible to have a size and structure that are suitable for separation and collection of fluids with high dryness such as warming up, and similarly, for the lower area as well, such as continuous blow of the drum, separation and collection of fluids with low dryness. The size and structure can be adapted to. Further, a partition plate 4 is provided between the upper area 3 and the lower area 6 so that a small amount of drain generated by separation of the fluid of high dryness in the upper area 3 flows down into the lower area 6. By providing the holes 12 necessary for this partition plate 4 in the flash pipe 1 of this compact size, even if the fluid of high dryness and the fluid of low dryness flow into the flash pipe 1 at the same time. Effective water / water separation can be performed. That is, in the fluid flowing from the steam pipe warming line 2 into the upper area 3, the drain is guided into the lower area 6 by the holes 12 provided in the partition plate 4 with the lower area 6 at the initial stage of the drain flow. Part of the saturated steam or superheated steam is released to the atmosphere via the exhaust pipe 9 with almost no effect on the water-water separation in the lower area 6. Also, the fluid of low dryness flowing into the lower area 6 is effectively separated in the lower area 6, which was created in consideration of the water-water separation of the fluid of low dryness. It passes through the guide pipe 10 which penetrates the area 3 and is guided to the exhaust pipe 9, and is released to the atmosphere via the exhaust pipe 9. The drain, which occupies most of the generated fluid, is stored in the lower area 6 and is discharged to the waste water treatment equipment via the drain pipe 7 as necessary. The lower area 6 has a structure in which a space for separating water and water of a low-dryness fluid is sufficiently provided above the drain level, so that the drain is prevented from scattering like rain. Moreover, since the fluid of high dryness flowing into the upper area 3 is partitioned by the lower area 6 and the partition plate 4 in the upper area 3, it has almost no effect on the water-water separation in the lower area 6 It is possible to avoid the condition that high-dryness fluid and low-dryness fluid affect each other's vapor-water separation in one area, as in the flash pipe of The phenomenon in which the vapor stream winds up the drain accumulated in the flash pipe and scatters it into the atmosphere like rain is prevented. The holes 12 provided in the partition plate 4 for partitioning the upper area 3 and the lower area 6 are provided so that the drain entering the upper area 3 can be discharged into the lower area 6 when draining water from the boiler. The high-dryness vapor in the upper area 3 partially flows into the lower area 6 through the holes 12, but by separating the internal structure so that the pressure balance of each part is appropriate, the separation of water and water in the lower area 6 is performed. It is possible to make the impact on the performance of the system very small. By using the flash pipe 1 that has the partition plate 4 inside and has a plurality of steam / water separation areas according to the conditions of the inflowing fluid, the area into which the fluid of high dryness flows can be separated by the steam / water separation. It is possible to effectively separate air and water in each area by adopting a structure that has the above-mentioned performance and an area into which a fluid of low dryness flows in. Furthermore, by arranging these divided areas vertically, it is possible to secure sufficient air-water separation performance while keeping the outer diameter of the flash pipe 1 compact, and in terms of performance, layout, and cost. It becomes possible to make the flush pipe 1 which is also advantageous in terms of its properties.

[0011]

[Effect of device]

 The gas-liquid separation device according to the present invention is configured as described above, and the partition plate divides the inner part into upper and lower areas, and the gas-liquid separation between the fluid of high dryness and the fluid of low dryness affects each other. Since they are performed without conflict, the structure that meets the conditions of the respective inflowing fluids in the upper and lower areas enables effective gas-liquid separation and ensures sufficient gas-liquid separation performance. The outer diameter becomes compact.

[Brief description of drawings]

FIG. 1 (a) is a sectional view of a flash pipe according to an embodiment of the invention, and FIG. 1 (b) is a plan view of a partition plate thereof.

FIG. 2 is a cross-sectional view of a conventional flash pipe.

[Explanation of symbols]

 1 Flash Pipe 2 Steam Pipe Warming Line 3 Upper Area 4 Partition Plate 5 Drum Continuous Blow Line 6 Lower Area 7 Drain Pipe 9 Exhaust Pipe 10 Guide Pipe 12 Holes

Claims (1)

[Scope of utility model registration request] 1. A fluid of high dryness flows in from a pipe provided in an upper part, and a fluid of low dryness flows in from a pipe provided in a lower part, and is internally separated into a gas and a liquid, and the gas is a liquid upwards. In the gas-liquid separation device discharged downward, a partition plate that divides the inside into upper and lower parts so as to be partially conductive between the above-mentioned pipe provided at the upper part and the above-mentioned pipe provided at the lower part is provided. Characteristic gas-liquid separation device.