阅读说明：本技术 一种定期排污扩容器 (Periodical pollution discharge flash tank ) 是由 杨宏伟 于 2019-03-07 设计创作，主要内容包括：本发明公开了一种定期排污扩容器,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,壳体顶部设置放空口,壳体上部设置冷却水进口,底部设置放净口,壳体中下部设置排污水进口,壳体下部设置倒U型排放管,壳体内部设置汽水分离流道和布水板,布水板位于汽水分离流道上方,布水板上分布直径为5～10mm的小孔,最上面一层布水板的中心位置处设置一个受水槽,最下面一层布水板下方水平设置一个与壳体同径的底盘,冷却水进口通过冷却水进口管与受水槽连通,底盘中间位置下方竖直设置一个圆筒形槽,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,倒U型排放管位于排污水进口下方。(The invention discloses a periodical blowdown flash tank, which aims to achieve zero steam emission of the periodical blowdown flash tank and ensure stable operation of equipment. The water distribution device comprises a shell, wherein a vent hole is formed in the top of the shell, a cooling water inlet is formed in the upper portion of the shell, a drain hole is formed in the bottom of the shell, an inverted U-shaped discharge pipe is formed in the lower portion of the shell, a steam-water separation flow channel and a water distribution plate are arranged in the shell, the water distribution plate is located above the steam-water separation flow channel, small holes with the diameter of 5-10 mm are formed in the water distribution plate, a water receiving groove is formed in the center of the uppermost layer of the water distribution plate, a base plate with the same diameter as the shell is horizontally arranged below the lowermost layer of the water distribution plate, the cooling water inlet is communicated with the water receiving groove through a cooling water inlet pipe, a cylindrical groove is vertically formed below the middle of the base plate, a circular space formed by the cylindrical groove and the shell is a steam-water separation flow channel, the.)

1. The utility model provides a 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 clean mouthful, and the lower part sets up the drain import in the casing, and the casing lower part sets up the type of falling U delivery pipe, the inside steam-water separation runner that sets up of casing, its characterized in that: the periodical blowdown flash tank also comprises a water distribution plate, wherein the water distribution plate is arranged in the shell and positioned above the steam-water separation flow channel, small holes are distributed in the water distribution plate, one or more layers of water distribution plates are arranged, when one layer is arranged, a water receiving tank is arranged at the central position of the water distribution plate, a chassis with the same diameter as that of the shell is horizontally arranged below the water distribution plate, when the layers are arranged, the central position of the uppermost layer of water distribution plate is provided with the water receiving tank, a chassis with the same diameter as that of the shell is horizontally arranged below the lowermost layer of water distribution plate, the water distribution plate adjacent to the upper end enclosure is positioned at the lower end of the upper end enclosure by 100-1000 mm, the water receiving tank is a tubular object with the lower end closed, a cooling water inlet is communicated with the water receiving tank through a cooling water inlet pipe, a cylindrical groove is vertically arranged below the middle position of the chassis, the base plate in the cylindrical groove is provided with holes, the aperture is 5-10 mm, the sewage inlet is communicated with the steam-water separation flow channel, and the inverted U-shaped discharge pipe is located below the sewage inlet.

2. The periodic blowdown flash tank of claim 1, wherein: the water distribution plate is provided with 1-3 layers, and small holes with the diameter of 5-10 mm are distributed in the water distribution plate.

3. The periodic blowdown flash tank of claim 1, wherein: the water distribution plate is welded on the inner wall of the shell or fixed on the inner wall of the shell by a flange; the thickness of the water distribution plate is 2-5 mm.

4. The periodic blowdown flash tank of claim 1, wherein: the height h of the water receiving tank is between the inner diameter of the cooling water inlet pipe and 500 mm.

5. The periodic blowdown flash tank of claim 1, wherein: the height h3 of the cylindrical groove is 100-1000 mm.

6. The periodic blowdown flash tank of claim 1, wherein: the area of an annular channel formed by the water receiving tank and the cooling water inlet pipe is 1-3 times that of the cooling water inlet pipe.

7. The periodic blowdown flash tank of claim 1, wherein: the height h1 from the water outlet of the cooling water inlet pipeline to the bottom of the water receiving tank 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.

8. 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, 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.

9. 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.

10. 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 h2 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 periodical 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 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, thoroughly solve white pollution and ensure stable operation of equipment.

The invention provides a periodic pollution discharge capacity expander, which comprises a shell, wherein the shell is 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 periodic pollution discharge capacity expander is: the periodical blowdown flash tank also comprises a water distribution plate, wherein the water distribution plate is arranged in the shell and positioned above the steam-water separation flow channel, small holes are distributed in the water distribution plate, one or more layers of water distribution plates are arranged, when one layer is arranged, a water receiving tank is arranged at the central position of the water distribution plate, a chassis with the same diameter as that of the shell is horizontally arranged below the water distribution plate, when the layers are arranged, the central position of the uppermost layer of water distribution plate is provided with the water receiving tank, a chassis with the same diameter as that of the shell is horizontally arranged below the lowermost layer of water distribution plate, the water distribution plate adjacent to the upper end enclosure is positioned in the range of 100-1000 mm below the lower end of the upper end enclosure, the water receiving tank is a tubular object with the lower end closed, a cooling water inlet is communicated with the water receiving tank through a cooling water inlet pipe, a cylindrical groove is vertically arranged below the middle position of the chassis, the base plate in the cylindrical groove is provided with holes, the aperture is 5-10 mm, the sewage inlet is communicated with the steam-water separation flow channel, and the inverted U-shaped discharge pipe is located below the sewage inlet.

The invention is further technically characterized in that: the water distribution plate is preferably provided with 1-3 layers, and small holes with the diameter of 5-10 mm are distributed in the water distribution plate.

The invention is further technically characterized in that: the water distribution plate is welded on the shell or fixed on the shell by a flange, and the thickness of the water distribution plate is 2-5 mm.

The invention is further technically characterized in that: the height h of the water receiving tank is between the inner diameter of the cooling water inlet pipe and 500 mm.

The invention is further technically characterized in that: the height h3 of the cylindrical groove is 100-1000 mm.

The invention is further technically characterized in that: the area of an annular channel formed by the water receiving tank and the cooling water inlet pipe is 1-3 times that of the cooling water inlet pipe.

The invention is further technically characterized in that: the height h1 from the water outlet of the cooling water inlet pipeline to the bottom of the water receiving tank 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 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, namely the lowest point of the sewage inlet is higher than the lowest point of the cylindrical groove, and the highest point of the sewage inlet is lower than the chassis; 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 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 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 linear distance h2 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: the invention only enables the steam separated from the sewage to travel along a path absorbed by the water layer, as long as the aperture of the water distribution plate and the steam flow rate are ensured, the steam can be gradually absorbed when passing through the water space because the water temperature is lower than the saturation temperature in the steam operation state, and the phenomenon of steam leakage and discharge can not occur, thereby avoiding white pollution; meanwhile, sewage is tangentially introduced into the fixed row, so that equipment vibration cannot be caused.

The invention is described in further detail below with reference to the figures and the detailed description, without limiting the scope of the invention.