CN215174955U

CN215174955U - Blowdown flash tank

Info

Publication number: CN215174955U
Application number: CN202121507005.5U
Authority: CN
Inventors: 高春阳; 王冬亮; 郑博; 李拓; 卢建北
Original assignee: Luoyang Wanji Power Generation Co ltd
Current assignee: Luoyang Wanji Power Generation Co ltd
Priority date: 2021-07-05
Filing date: 2021-07-05
Publication date: 2021-12-14
Anticipated expiration: 2031-07-05

Abstract

A blowdown flash tank related to technical field of the boiler blowdown, include controller, tank and heat exchange coil; a steam outlet pipe is arranged in the center of the top end face of the tank body, the inner port of the steam outlet pipe is connected with a gas-liquid separator, a wastewater outlet pipe is arranged on the bottom end face of the tank body, a first electromagnetic valve is arranged on the wastewater outlet pipe, and a high liquid level switch, a medium liquid level switch and a low liquid level switch are sequentially arranged on the tank wall of the tank body from top to bottom; the heat exchange coil is arranged in the tank body, and a second electromagnetic valve is arranged at the water inlet of the coil; a spiral diversion trench for guiding sewage flow direction is arranged in the tank body between the high liquid level switch and the middle liquid level switch, and a sewage inlet pipe corresponding to a groove cavity at the upper end of the spiral diversion trench is arranged on the tank wall of the tank body close to the high liquid level switch; the controller is respectively in signal connection with the first electromagnetic valve, the second electromagnetic valve, the high liquid level switch, the medium liquid level switch and the low liquid level switch; this blowdown flash tank can effectively improve the thermal recycle effect of boiler blowdown.

Description

Blowdown flash tank

Technical Field

The utility model belongs to the technical field of boiler blowdown technique and specifically relates to a blowdown flash tank is related to.

Background

The sewage discharge flash tank can separate secondary steam and waste hot water from sewage discharged by a boiler through pressure reduction and flash, the secondary steam is discharged into the atmosphere or used as a heat source, and the waste hot water is generally discharged into a drainage system through a sewage discharge cooling tank;

the existing pollution discharge flash tank can be used for converting waste heat of waste hot water, a heat exchanger is arranged in the pollution discharge flash tank to carry out heat exchange, but the pollution discharge flash tank is used for carrying out heat exchange under the condition of periodical pollution discharge, the separation of secondary steam and the waste hot water can be caused by the height of the liquid level, the heat exchange stability of the heat exchanger is influenced, the heat exchange of the heat exchanger is more stable as the liquid level is higher, the separation efficiency of the secondary steam and the waste hot water is lower, and therefore a reasonable-design adjusting mode is needed, and the recycling effect of boiler pollution discharge heat is improved.

Disclosure of Invention

In order to overcome not enough in the background art, the utility model discloses a blowdown flash tank can effectively improve the thermal recycle effect of boiler blowdown.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a blowdown flash tank comprises a controller, a tank body and a heat exchange coil; a steam outlet pipe is arranged in the center of the top end face of the tank body, a gas-liquid separator is connected to an inner port of the steam outlet pipe, a wastewater outlet pipe is arranged on the bottom end face of the tank body, a first electromagnetic valve is mounted on the wastewater outlet pipe, and a high liquid level switch, a medium liquid level switch and a low liquid level switch are sequentially mounted on the tank wall of the tank body from top to bottom; the heat exchange coil and the tank body are coaxially arranged in the tank body, the heights of the two ends of the whole heat exchange coil are respectively close to the high liquid level switch and the low liquid level switch, the pipe orifices of the upper end and the lower end of the heat exchange coil extend out of the tank body and are respectively arranged as a coil water outlet and a coil water inlet, and a second electromagnetic valve is arranged at the coil water inlet; a spiral diversion trench for guiding sewage flow direction is arranged in the tank body between the high liquid level switch and the middle liquid level switch, and a sewage inlet pipe corresponding to a groove cavity at the upper end of the spiral diversion trench is arranged on the tank wall of the tank body close to the high liquid level switch; the controller is respectively in signal connection with the first electromagnetic valve, the second electromagnetic valve, the high liquid level switch, the medium liquid level switch and the low liquid level switch.

Furthermore, the groove wall of the spiral diversion groove is fixedly connected with the inner wall of the tank body.

Furthermore, the upper end and the lower end of the spiral diversion trench are respectively fixedly connected with the pipe wall of the heat exchange coil pipe.

Furthermore, a separating baffle is arranged at the top of the tank body, vent holes are formed in the outer edge of the plate surface of the separating baffle, a fixed stay bar is connected to the center of the lower plate surface of the separating baffle, and the fixed stay bar is fixedly connected with the outer pipe wall of the heat exchange coil.

Furthermore, an overflow pipe is arranged on the pipe wall of the tank body at a height corresponding to the high liquid level switch, and a drain valve is installed on the overflow pipe.

Further, a heat-insulating layer is arranged outside the tank body.

Further, the tank body is provided with a manhole.

Further, a pressure measuring device is installed on the top pipe wall of the tank body.

Due to the adoption of the technical scheme, the utility model discloses following beneficial effect has:

the utility model discloses a blowdown flash tank can detect the sewage water level in the jar body through high liquid level switch, well liquid level switch and low liquid level switch, when the boiler needs the blowdown, and the water level is in when high liquid level switch, can control first solenoid valve to open through the controller, and close the second solenoid valve, prevent that the heat transfer coil from exchanging heat when jar body temperature reduces, guarantee the stability of heat transfer, when the spiral guiding gutter exposes, after jar body sewage discharges, close first solenoid valve, be convenient for boiler sewage can improve the separation efficiency of secondary steam and waste hot water through spiral guiding gutter, when boiler sewage reaches well liquid level switch, the second solenoid valve is controlled again to open and stabilizes the heat transfer; to sum up, the utility model discloses can carry out reasonable the regulation through detecting the liquid level to improve the thermal recycle effect of boiler blowdown.

Drawings

Fig. 1 is a schematic diagram of an implementation structure of the present invention.

In the figure: 1. a vapor outlet pipe; 2. a gas-liquid separator; 3. a vent hole; 4. an overflow pipe; 5. a drain valve; 6. a tank body; 7. a heat-insulating layer; 8. fixing the stay bar; 9. a manhole; 10. a second solenoid valve; 11. a first solenoid valve; 12. a waste water outlet pipe; 13. a low level switch; 14. a heat exchange coil; 15. a medium liquid level switch; 16. a controller; 17. a spiral diversion trench; 18. a sewage inlet pipe; 19. a high liquid level switch; 20. a pressure measuring device; 21. separating the baffles.

Detailed Description

In the following description, the technical solution of the present invention will be described with reference to the accompanying drawings in the embodiment of the present invention, it should be understood that, if there are the indicated positions or positional relationships such as "upper", "lower", "front", "rear", "left", "right", etc., it only corresponds to the drawings of the present invention, and for convenience of description, it is not intended to indicate or imply that the indicated device or element must have a specific position:

the blowdown flash tank described in conjunction with fig. 1, comprises a controller 16, a tank 6 and a heat exchange coil 14; a steam outlet pipe 1 is arranged in the center of the top end face of the tank body 6, separated secondary steam can be discharged from the steam outlet pipe 1 for recycling, and an inner port of the steam outlet pipe 1 is connected with a gas-liquid separator 2 to prevent small particle liquid drops from being taken away by steam; a waste water outlet pipe 12 is arranged on the bottom end surface of the tank body 6, a first electromagnetic valve 11 is arranged on the waste water outlet pipe 12, and the waste water outlet pipe 12 is controlled to discharge hot waste water by controlling the opening and closing of the first electromagnetic valve 11; the tank body 6 is provided with a manhole 9 for maintenance according to requirements; in addition, a pressure measuring device 20 is arranged on the top pipe wall of the tank body 6, so that the pressure in the tank body 6 can be monitored conveniently;

the tank wall of the tank body 6 is sequentially provided with a high liquid level switch 19, a middle liquid level switch 15 and a low liquid level switch 13 from top to bottom; the heat exchange coil 14 and the tank body 6 are coaxially arranged in the tank body 6, the heights of the two ends of the whole heat exchange coil 14 are respectively close to the high liquid level switch 19 and the low liquid level switch 13, the pipe orifices of the upper end and the lower end of the heat exchange coil 14 extend out of the tank body 6 and are respectively arranged as a coil water outlet and a coil water inlet, the coil water inlet is provided with a second electromagnetic valve 10, the heat exchange stable water level of the heat exchange coil 14 is positioned between the high liquid level switch 19 and the middle liquid level switch 15, and when the water level is below the middle liquid level switch 15, no matter secondary steam or waste hot water is less, the heat exchange stability is not facilitated; according to the requirement, a separation baffle 21 is arranged at the inner top of the tank body 6, vent holes 3 are formed in the outer edge of the plate surface of the separation baffle 21, a fixed support rod 8 is connected to the center of the lower plate surface of the separation baffle 21, the fixed support rod 8 is fixedly connected with the outer pipe wall of the heat exchange coil 14, the gas flow path is increased through the separation baffle 21, large-particle water drops can conveniently fall down, and the heat exchange coil 14 is stably supported through the arrangement of the fixed support rod 8;

a spiral diversion trench 17 for guiding sewage to flow is arranged in the tank body 6 between the high liquid level switch 19 and the middle liquid level switch 15, a sewage inlet pipe 18 corresponding to a groove cavity at the upper end of the spiral diversion trench 17 is arranged on the tank wall of the tank body 6 close to the high liquid level switch 19, and boiler sewage enters the spiral diversion trench 17 through the sewage inlet pipe 18, so that the boiler sewage can be quickly separated into secondary steam and waste hot water; according to the requirement, the wall of the spiral pouring groove 17 is fixedly connected with the inner wall of the tank body 6, or the upper end and the lower end of the spiral pouring groove 17 are respectively fixedly connected with the wall of the heat exchange coil 14, so that the spiral pouring groove 17 is ensured to be stably connected; in addition, an overflow pipe 4 is arranged on the pipe wall of the tank body 6 corresponding to the height of the high liquid level switch 19, a drain valve 5 is arranged on the overflow pipe 4, when the liquid level in the tank body 6 is higher than the pipe orifice at the inner end of the overflow pipe 4, the liquid can overflow and be discharged outwards, and the drain valve 5 can prevent secondary steam from being discharged from the overflow pipe 4; in addition, a heat-insulating layer 7 is arranged outside the tank body 6, so that excessive heat loss in the environment is prevented;

controller 16 respectively with first solenoid valve 11, second solenoid valve 10, high liquid level switch 19, well liquid level switch 15 and low liquid level switch 13 signal connection, can detect the sewage water level in the jar body 6 through high liquid level switch 9, well liquid level switch 15 and low liquid level switch 13, when the boiler needs the blowdown, and the water level is in high liquid level switch 19, can control first solenoid valve 11 through controller 16 and open, and close second solenoid valve 10, prevent heat transfer coil 14 heat transfer when jar body 6 temperature reduces, guarantee the stability of heat transfer, expose when spiral pouring basin 17, after jar body 6 sewage discharges, close first solenoid valve 11, be convenient for boiler sewage can improve the separation efficiency of secondary steam and waste hot water through spiral pouring basin 17, when liquid level switch 15 in boiler sewage reaches, it stabilizes the heat transfer to control second solenoid valve 10 to open again.

The details of the present invention not described in detail are prior art, and it will be apparent to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof; the present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the scope of the claims.

Claims

1. The utility model provides a blowdown flash tank which characterized in that: comprises a controller (16), a tank body (6) and a heat exchange coil (14); a steam outlet pipe (1) is arranged in the center of the top end face of the tank body (6), an inner port of the steam outlet pipe (1) is connected with a gas-liquid separator (2), a waste water outlet pipe (12) is arranged on the bottom end face of the tank body (6), a first electromagnetic valve (11) is installed on the waste water outlet pipe (12), and a high liquid level switch (19), a medium liquid level switch (15) and a low liquid level switch (13) are sequentially installed on the tank wall of the tank body (6) from top to bottom; the heat exchange coil (14) and the tank body (6) are coaxially arranged in the tank body (6), the heights of the two ends of the whole heat exchange coil (14) are respectively close to the high liquid level switch (19) and the low liquid level switch (13), the pipe orifices of the upper end and the lower end of the heat exchange coil (14) extend out of the tank body (6) and are respectively arranged as a coil water outlet and a coil water inlet, and a second electromagnetic valve (10) is arranged at the coil water inlet; a spiral flow guide groove (17) for guiding the sewage to flow is arranged in the tank body (6) between the high liquid level switch (19) and the middle liquid level switch (15), and a sewage inlet pipe (18) corresponding to a groove cavity at the upper end of the spiral flow guide groove (17) is arranged on the tank wall of the tank body (6) close to the high liquid level switch (19); the controller (16) is in signal connection with the first electromagnetic valve (11), the second electromagnetic valve (10), the high liquid level switch (19), the medium liquid level switch (15) and the low liquid level switch (13) respectively.

2. The blowdown flash tank of claim 1, wherein: the wall of the spiral diversion trench (17) is fixedly connected with the inner wall of the tank body (6).

3. The blowdown flash tank of claim 1, wherein: the upper end and the lower end of the spiral diversion trench (17) are respectively fixedly connected with the pipe wall of the heat exchange coil pipe (14).

4. The blowdown flash tank of claim 1, wherein: the interior top of the jar body (6) is equipped with separates baffle (21), the face outer fringe of separating baffle (21) is equipped with air vent (3), the lower facial features central authorities of separating baffle (21) are connected with fixed vaulting pole (8), fixed vaulting pole (8) and heat exchange coil (14) outer pipe wall fixed connection.

5. The blowdown flash tank of claim 1, wherein: the height that the wall of the tank body (6) corresponds to the high liquid level switch (19) is provided with an overflow pipe (4), and a drain valve (5) is arranged on the overflow pipe (4).

6. The blowdown flash tank of claim 1, wherein: and a heat-insulating layer (7) is arranged outside the tank body (6).

7. The blowdown flash tank of claim 1, wherein: the tank body (6) is provided with a manhole (9).

8. The blowdown flash tank of claim 1, wherein: and a pressure measuring device (20) is arranged on the top pipe wall of the tank body (6).