阅读说明：本技术 一种筛板塔盘式定期排污扩容器 (Sieve plate tower disc type periodical pollution discharge flash tank ) 是由 杨宏伟 于 2019-03-07 设计创作，主要内容包括：公开了一种筛板塔盘式定期排污扩容器,以达到定期排污扩容器的蒸汽零排放,保证设备稳定运行。其包括壳体、冷却水进口、排污水进口和倒U型排放管,壳体内部从下到上依次设置汽水分离流道和塔盘,每层塔盘包括塔板、降液管和溢流堰,最上面一层塔盘上方竖直设置一个矩形挡板,最下面一层下方设置一个与壳体同径的底盘,所述矩形挡板与溢流堰平行,矩形挡板和壳体之间为冷却水进水空间,冷却水进口连通冷却水进水空间,所述底盘中间位置竖直设置一个圆筒形槽,圆筒形槽竖直穿过底盘,位于底盘下方的圆筒形槽、壳体和底盘围成的圆环形空间为汽水分离流道,排污水进口与汽水分离流道连通。(A sieve-plate tower-type periodical blowdown flash tank is disclosed, which features no steam discharge and stable running of equipment. The water-cooling tower comprises a shell, a cooling water inlet, a sewage draining inlet and an inverted U-shaped discharge pipe, wherein a steam-water separation flow channel and tower trays are sequentially arranged in the shell from bottom to top, each layer of tower tray comprises a tower plate, a downcomer and an overflow weir, a rectangular baffle is vertically arranged above the uppermost layer of tower tray, a chassis which is the same as the shell in diameter is arranged below the lowermost layer of tower tray, the rectangular baffle is parallel to the overflow weir, a cooling water inlet space is arranged between the rectangular baffle and the shell, the cooling water inlet is communicated with the cooling water inlet space, a cylindrical groove is vertically arranged in the middle of the chassis, the cylindrical groove vertically penetrates through the chassis, a cylindrical groove below the chassis, a circular space surrounded by the shell and the chassis is a steam-water separation flow channel, and the sewage draining.)

1. The utility model provides a sieve plate tower disk periodic blowdown flash tank, includes the casing, and the casing is both ends confined vertical cylindric structure, and the casing top sets up the drain, and casing upper portion sets up the cooling water import, and the bottom setting is put completely mouthful, and the lower part sets up the sewage import in the casing, and the casing lower part sets up the type of falling U delivery pipe, the inside catch water flow way that sets up of casing, its characterized in that: the sieve plate tray type periodical pollution discharge capacity expander also comprises a tray, wherein the tray is arranged in the shell and positioned above the steam-water separation flow channel, one or more layers are arranged, each layer of tray comprises a tray, a downcomer and an overflow weir, when one layer is arranged, a rectangular baffle is vertically arranged at the position opposite to the overflow weir above the layer of tray, a chassis with the same diameter as the shell is horizontally arranged below the layer of tray, when multiple layers are arranged, a rectangular baffle is vertically arranged above the uppermost layer of tray, a chassis with the same diameter as the shell is arranged below the lowermost layer, the rectangular baffle is parallel to the overflow weir, a cooling water inlet space is arranged between the rectangular baffle and the shell, a cooling water inlet pipe is arranged and communicated with a cooling water inlet, a cylindrical groove is vertically arranged in the middle position of the chassis, the cylindrical groove vertically penetrates through the chassis, and a cylindrical groove positioned below the chassis, The circular space enclosed by the shell and the chassis is a steam-water separation flow channel, the chassis positioned in the cylindrical groove is distributed with holes II, a sewage inlet is communicated with the steam-water separation flow channel, the inverted U-shaped discharge pipe is positioned below the sewage inlet, the tower plate is provided with holes I, and the tower plate at the cooling water inlet space is not provided with holes.

2. The periodic blowdown flash tank of claim 1, wherein: the tower tray is provided with 1-10 layers.

3. A periodically blowdown flash tank as claimed in claim 1 or claim 2, wherein: the tower tray is provided with 3-5 layers.

4. The periodic blowdown flash tank of claim 1, wherein: the aperture of the hole I is 5-10 mm, so that the speed of steam flowing through the hole I is less than 1.6m/s, and the aperture of the hole II is 5-10 mm.

5. The periodic blowdown flash tank of claim 1, wherein: the height h1 of the overflow weir takes a value of 40-70 mm.

6. The periodic blowdown flash tank of claim 1, wherein: the downcomer is an arched flow channel, and the size of the arch height L1 is 50-500 mm.

7. The periodic blowdown flash tank of claim 1, wherein: two adjacent tower trays are symmetrically arranged, and the distance between two adjacent tower plates is 100-1000 mm.

8. The periodic blowdown flash tank of claim 1, wherein: the distance h2 between the bottom of the rectangular baffle and the top of the adjacent tower plate is between the inner diameter of the cooling water inlet pipe and 500 mm.

9. The periodic blowdown flash tank of claim 1, wherein: the distance h3 between the bottom of the overflow weir and the top of the adjacent tower plate below the overflow weir takes 50-400 mm.

10. The periodic blowdown flash tank of claim 1, wherein: the height h4 from the water outlet of the cooling water inlet pipe to the adjacent tower plate is determined according to the following principle: the height multiplied by the perimeter of the cooling water inlet pipe is between 1 and 1.5 times the cross-sectional area of the cooling water inlet pipe.

11. The periodic blowdown flash tank of claim 1, wherein: the diameter phi 1 of the cylindrical groove is between 1/3 and 4/5 of the diameter of the shell.

12. The periodic blowdown flash tank of claim 1, wherein: the height h5 of the cylindrical groove above the chassis is 40-150 mm, and the height h6 of the cylindrical groove below the chassis is less than 600 mm.

13. The periodic blowdown flash tank of claim 1, wherein: the distance h7 between the highest point of the inverted U-shaped drain pipe and the lowest point of the cylindrical groove is 100-1000 mm.

14. The periodic blowdown flash tank of claim 1, wherein: the distance h7 between the highest point of the inverted U-shaped drain pipe and the lowest point of the cylindrical groove is 100-300 mm.

15. The periodic blowdown flash tank of claim 1, wherein: the sewage inlet enters the steam-water separation flow channel along the tangential direction of the shell, the height position of the sewage inlet is limited by the height range of the cylindrical groove below the chassis, the number of the sewage inlets is one or more, and when the sewage inlets are multiple, the sewage inlets are uniformly distributed along the circumference of the shell.

16. The periodic blowdown flash tank of claim 1, wherein: the cross section area of the annular passage of the steam-water separation flow passage is 1-20 times of the sum of the total cross sections of the sewage inlet.

17. The periodic blowdown flash tank of claim 1, wherein: the inverted U-shaped discharge pipe is composed of a vertically arranged straight pipe, a horizontally arranged straight pipe and an elbow pipe, the bottom end of the vertically arranged straight pipe of the inverted U-shaped discharge pipe is a water suction port, and the straight-line distance h8 from the water suction port to the lower end socket of the shell is 100-500 mm.

Technical Field

The invention relates to a pollution discharge flash tank, in particular to a sieve plate tower tray type periodic pollution discharge flash tank which is suitable for being used in pollution discharge systems of various boilers, steam generators and the like.

Background

The periodic blowdown flash tank is an important device of a steam boiler system, and is called 'fixed exhaust' for short. The low points of equipment such as a steam drum, a header and a continuous blowdown flash tank in the steam boiler system, which are easy to store up the sewage, need to regularly discharge the sewage out of the system, and the sewage is taken away through drainage in a drainage mode to realize blowdown. The fixed drainage is equipment for receiving the drainage and further carrying out capacity expansion and temperature reduction treatment on the drainage. The quality and quantity of the dirt contained in the drainage water are different, the pressure, temperature and flow rate of the drainage water are different, and the time for entering the fixed drainage is not determined. The inlet water of the fixed row has intermittence, the pressure, the temperature and the flow fluctuation of the inlet water are large, the quality and the quantity fluctuation of the dirt contained in the inlet water are large, and the characteristic is the working condition characteristic of the fixed row.

The periodic blowdown flash tank is a container directly communicated with the atmosphere, after the incoming water enters the periodic discharge, the boiling point of the water is reduced due to pressure reduction, part of the water is converted into a gas state from a liquid state, the converted steam is mainly discharged to the atmosphere through a vent, and the residual water after flash evaporation is discharged through a waste water outlet.

The working condition of the periodic blowdown flash tank determines that in the blowdown of a boiler system and the subsequent flash evaporation and steam discharge processes, part of steam and carried moisture are discharged into the atmosphere, and because the ambient temperature is lower than the steam temperature, the steam releases heat and condenses into liquid water drops, and the water drops are white in the air, so that the phenomenon is called white pollution. The condensation of the steam releases heat to the environment, causing thermal pollution.

In recent years, in the aspect of reducing and eliminating 'white pollution', one method is to spray water in a fixed-discharge steam space, and the other method is to arrange a heat exchanger in a cylinder, so that the phenomenon of steam emptying is not thoroughly solved due to no effective interception and absorption.

The steam flashed out from the existing periodical blowdown flash vessel is either directly discharged into the atmosphere or partially absorbed, and a small amount of steam is always discharged into the atmosphere.

The structure of the common pollution discharge flash tank for directly discharging steam into atmosphere is characterized in that: the sewage enters an annular flow channel of the sewage flash tank tangentially, and steam and water are separated due to the action of centrifugal force. The upper end of the annular flow passage is closed, and the lower end of the annular flow passage is open. The separated water directly falls into the water space of the pollution discharge flash vessel, and the separated steam upwards passes through the steam space along the lower edge of the flow channel in a folding direction of 180 degrees and is discharged into the atmospheric environment through a steam outlet at the top end of the periodic pollution discharge flash vessel. The disadvantages are that the steam is directly discharged into the atmosphere to form white pollution; the ground around the periodic blowdown flash tank in the severe cold area is often frozen in winter.

Chinese patent No. CN 204460167U discloses a novel fixed-row flash tank exhaust steam recovery device for a boiler. The technology comprises a fixed-discharge steam exhaust pipe and a cooling water pipe which are communicated with a fixed-discharge flash tank, and also comprises a branch pipe and a water tank; the fixed-row steam exhaust pipe is connected with a fixed-row flash tank, and the fixed-row flash tank is connected with the water tank through a condensed water return pipe; the cooling water pipe is connected with the water tank; one end of the branch pipe is connected with the cooling water pipe, and the other end of the branch pipe is arranged in the fixed exhaust steam pipe; the end part of the branch pipe is provided with a nozzle, and the branch pipe is also provided with a control valve. The multi-way branch pipes are arranged in parallel up and down, the free ends of the branch pipes are arranged in the fixed-discharge steam exhaust pipe, and nozzles and control valves are respectively arranged on the branch pipes; the other end of each branch pipe is connected with a cooling water pipe in a centralized manner. The water spraying method is used for reducing the moisture carried in the exhausted steam, but the spraying and cooling needs violent mass and heat transfer and sufficient contact of the water vapor, so that the ideal state of not exhausting the steam completely cannot be achieved in practical use.

Chinese patent with publication number CN 107726291A discloses an environment-friendly periodical blowdown flash tank, it includes shell body (1) that the cover was established in proper order from the extroversion, draft tube (2) and evacuation section of thick bamboo (3), the upper end of evacuation section of thick bamboo (3) is located outside shell body (1), the lower extreme of evacuation section of thick bamboo (3) is located in the upper end of draft tube (2), draft tube (2) are located shell body (1), be equipped with on the lateral wall of shell body (1) sewage entry (4), the lower part of shell body (1) is equipped with sewage export (5), be equipped with baffling board (6) between shell body (1) and draft tube (2), baffling board (6) are located the top of sewage entry (4). The sewage discharged by the technology is directly discharged into the fixed drainage along the radius direction of the shell of the periodical sewage discharge flash tank; the separated steam is further separated by the baffle plate and then is discharged into the atmosphere after being deflected twice along the slits of the casing structure, but the technology has the defects that: 1) when the pressure of the sewage is higher (more than 0.2MPa absolute pressure), equipment vibration can be caused; 2) the steam is not completely intercepted, and the emptying phenomenon cannot be avoided.

Disclosure of Invention

The invention aims to provide a sieve plate tower tray type periodical blowdown flash tank aiming at the defects of the prior art so as to achieve zero steam emission of the periodical blowdown flash tank, solve white pollution and ensure stable operation of equipment.

The invention provides a sieve plate tower disc type periodic pollution discharge capacity expander which comprises a shell, wherein the shell is of a vertical cylindrical structure with two closed ends, the top of the shell is provided with a vent, the upper part of the shell is provided with a cooling water inlet, the bottom of the shell is provided with a drain outlet, the middle lower part of the shell is provided with a sewage discharge inlet, the lower part of the shell is provided with an inverted U-shaped discharge pipe, and a steam-water separation flow passage is arranged in the shell, and the sieve plate tower disc type: the sieve plate tray type periodical pollution discharge capacity expander also comprises a tray, wherein the tray is arranged in the shell and positioned above the steam-water separation flow channel, one or more layers are arranged, each layer of tray comprises a tray, a downcomer and an overflow weir, when one layer is arranged, a rectangular baffle is vertically arranged at the position opposite to the overflow weir above the layer of tray, a chassis with the same diameter as the shell is horizontally arranged below the layer of tray, when multiple layers are arranged, a rectangular baffle is vertically arranged above the uppermost layer of tray, a chassis with the same diameter as the shell is arranged below the lowermost layer, the rectangular baffle is parallel to the overflow weir, a cooling water inlet space is arranged between the rectangular baffle and the shell, a cooling water inlet pipe is arranged and communicated with a cooling water inlet, a cylindrical groove is vertically arranged in the middle position of the chassis, the cylindrical groove vertically penetrates through the chassis, and a cylindrical groove positioned below the chassis, The circular space enclosed by the shell and the chassis is a steam-water separation flow channel, the chassis positioned in the cylindrical groove is provided with holes II, the hole diameter is 5-10 mm, a sewage inlet is communicated with the steam-water separation flow channel, the inverted U-shaped discharge pipe is positioned below the sewage inlet, the tower plate is provided with holes I, and no hole is formed in the tower plate at the cooling water inlet space.

The invention is further technically characterized in that: the tower tray is provided with 1-10 layers, preferably 3-5 layers.

The invention is further technically characterized in that: the aperture of the hole I is 5-10 mm, so that the speed of steam flowing through the hole I is less than 1.6 m/s.

The invention is further technically characterized in that: the height h1 of the overflow weir takes a value of 40-70 mm.

The downcomer is an arched flow channel, and the size of the arch height L1 is 50-500 mm.

The distance between every two adjacent tower plates is 100-1000 mm. Two adjacent trays are symmetrically arranged.

The distance h2 between the bottom of the baffle and the top of the adjacent tower plate is between the inner diameter of the cooling water inlet pipe and 500 mm.

The distance h3 between the bottom of the overflow weir and the top of the adjacent tower plate below is 50-400 mm, and the flow area is equal to the flow area of the downcomer.

The invention is further technically characterized in that: the height h4 from the water outlet of the cooling water inlet pipe to the adjacent tower plate is determined according to the following principle: the height multiplied by the perimeter of the cooling water inlet pipe is between 1 and 1.5 times the cross-sectional area of the cooling water inlet pipe.

The invention is further technically characterized in that: the diameter phi 1 of the cylindrical groove is between 1/3 and 4/5 of the diameter of the shell.

The invention is further technically characterized in that: the height h5 of the cylindrical groove above the chassis is 40-150 mm, and the height h6 of the cylindrical groove below the chassis is less than 600 mm.

The invention is further technically characterized in that: the distance h7 between the highest point of the inverted U-shaped drain pipe and the lowest point of the cylindrical groove is 100-1000 mm, preferably 100-300 mm.

The invention is further technically characterized in that: the sewage inlet enters the steam-water separation flow passage along the tangential direction of the shell, the height position of the sewage inlet is limited by the height range of the cylindrical groove below the chassis, namely the lowest point of the sewage inlet is higher than the lowest point of the cylindrical groove below the chassis, and the highest point of the sewage inlet is lower than the chassis.

The invention is further technically characterized in that: the cross section area of the annular passage of the steam-water separation flow passage is 1-20 times of the sum of the total cross sections of the sewage inlet.

The invention is further technically characterized in that: the number of the sewage outlets can be one or more, and when the number of the sewage outlets is more than one, the sewage outlets are uniformly distributed along the circumference of the shell.

The invention is further technically characterized in that: the inverted U-shaped discharge pipe is composed of a vertically arranged straight pipe, a horizontally arranged straight pipe and an elbow pipe, the bottom end of the vertically arranged straight pipe of the inverted U-shaped discharge pipe is a water suction port, and the straight-line distance h8 from the water suction port to the lower end socket of the shell is 100-500 mm.

The invention is mainly used in the blowdown systems of various boilers, steam generators and the like.

Compared with the prior art, the invention has the advantages that: through the arrangement of the equipment result, the steam flashed out by the sewage can only travel upwards through the water layer and is absorbed by water in the ascending process, and no passage exists in addition, so that the steam emptying is completely avoided, and meanwhile, the space between the two layers of tower plates provides enough space for the heat exchange of the water and the steam, so that the vibration during the mixing of the steam and the water can be avoided; the sewage is introduced tangentially, so that the forward impact of high-pressure water on the equipment is avoided, and the equipment cannot vibrate.

The invention is described in further detail below with reference to the drawings and the detailed description, but the following description does not limit the scope of the invention.