CN218721421U

CN218721421U - Drainage pipeline structure of air heater of power station boiler

Info

Publication number: CN218721421U
Application number: CN202222908850.4U
Authority: CN
Inventors: 张晖; 方青; 李国盛; 王传金; 王宗宇
Original assignee: Huaneng Fujian Energy Development Co Ltd Fuzhou Branch
Current assignee: Huaneng Fujian Energy Development Co Ltd Fuzhou Branch
Priority date: 2022-10-31
Filing date: 2022-10-31
Publication date: 2023-03-24
Anticipated expiration: 2032-10-31

Abstract

The utility model relates to a power plant boiler fan heater hydrophobic technical field's a power plant boiler fan heater hydrophobic pipeline structure, including boiler drain flash tank and condenser, the condenser has the drain header, the drain end of boiler drain flash tank communicates to the drain header through the conduit, there is the difference in height between boiler drain flash tank drain end and the drain header, and the hydrophobic flash tank of boiler is pressed and is greater than the condenser and press in, has reduced the power consumption through the novel type pipeline of design redesign and has guaranteed system safety operation, can utilize the heat energy of ponding can save the electric energy again.

Description

Drainage pipeline structure of air heater of power station boiler

Technical Field

The utility model relates to a power plant boiler fan heater drainage pipeline structure belongs to the hydrophobic technical field of power plant boiler fan heater.

Background

The boiler air heater is common equipment of a thermal power station, and utilizes a low-pressure steam source to heat inlet air of an air preheater of the boiler so as to increase the temperature of the air and the wall temperature of the air preheater, thereby preventing low-temperature corrosion. The steam source for heating air will produce partial condensed water, and the condensed water will be injected into the water draining flash tank of the boiler air heater. The unit design boiler air heater drainage flash tank ponding discharges into the oxygen-eliminating device through the air heater drainage pump in order to guarantee the utilization of the heat source; as shown in fig. 2.

Because the liquid level of the drain tank of the air heater is drained by the drain pump of the air heater when the liquid level reaches a fixed value, and the time span is longer when the liquid level reaches the fixed value, the drain pipeline is in a cold state for a long time and the pipeline is longer, at the moment, the drain pump is suddenly started and the drain valve is opened, the condensed water flow of the pipeline suddenly changes, and the pressure of the pipeline suddenly changes to cause water attack; the pipeline vibration is large, the serious result of pipeline burst can be caused, and the safe operation of the power generation system is influenced.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems existing in the prior art, the utility model provides a drain pipeline structure of a boiler air heater of a power station.

The technical scheme of the utility model as follows:

the utility model provides a power plant boiler fan heater drain pipeline structure, includes boiler drainage flash tank and condenser, the condenser has the drainage header, boiler drainage flash tank drainage end communicates to the drainage header through the conduit, there is the difference in height between boiler drainage flash tank drainage end and the drainage header, and boiler drainage flash tank internal pressure is greater than condenser internal pressure.

Wherein, the drainage end of the boiler drainage flash tank is positioned at the elevation of 10 meters, and the drainage header is positioned at the elevation of 0 meter.

Wherein the internal pressure of the boiler drainage flash tank is 0.1MPa, and the internal pressure of the condenser is 4.9KPa.

The water conveying pipeline is provided with a U-shaped water sealing section, and the U-shaped water sealing section is formed by descending the water conveying pipeline to a negative rice mark and then rising the water conveying pipeline to a meter height.

And one side of the water delivery pipeline close to the drainage end of the boiler drainage flash tank is provided with a manual valve.

The hydraulic system comprises a water pipe, a drainage header, a boiler drainage flash tank, a water level sensor, an external DCS control end and a pneumatic control valve, wherein the pneumatic control valve is arranged on one side, close to the drainage header, of the water pipe, the liquid level sensor is arranged in the boiler drainage flash tank, the liquid level sensor is electrically connected with the external DCS control end, and the external DCS control end is electrically connected with the pneumatic control valve.

The utility model discloses following beneficial effect has:

the utility model ensures the stability of drainage; the original system needs to monitor the water level of a drain tank, and a drain pump is manually started to drain water at regular intervals; the negative pressure that adopts this novel system device will pass through the condenser carries out normal drainage and need not to adopt the drainage pump to practice thrift the power, and the pipeline flow does not produce violent change and has got rid of the water hammer risk, installs pneumatic control valve on the drainage pipeline, can guarantee that the drain box is normally drained and need not artificial control according to the automatic regulation aperture of pneumatic control valve of water level height switch automatic feedback.

Drawings

FIG. 1 is a schematic view of the structure of the drain pipeline of the utility model of the air heater of the utility model;

FIG. 2 is a schematic view of the structure of the drain pipeline of the existing air heater of the utility boiler.

The reference numbers in the figures denote:

the system comprises a boiler drain flash tank 1, a condenser 2, a drain header 21, a water delivery pipeline 3, a U-shaped water seal section 31, a manual valve 4, a pneumatic control valve 5, a liquid level sensor 6 and an external DCS control end 7.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1-2, a drain pipeline structure of a power station boiler air heater comprises a boiler drain flash tank 1 and a condenser 2, wherein the condenser 2 is provided with a drain collecting pipe 21, the drain end of the boiler drain flash tank 1 is communicated to the drain collecting pipe 21 through a water pipeline 3, one side of the water pipeline 3 close to the drain end of the boiler drain flash tank 1 is provided with a manual valve 4, and the on-off of the water pipeline 3 is controlled by opening and closing the manual valve 4;

the height difference exists between the drainage end of the boiler drainage expansion tank 1 and the drainage collecting pipe 21, the drainage end of the boiler drainage expansion tank 1 is positioned at the elevation of 10 meters, and the drainage collecting pipe 21 is positioned at the elevation of 0 meter; the internal pressure of the boiler drainage expansion tank 1 is greater than the internal pressure of the condenser 2, the internal pressure of the boiler drainage expansion tank 1 is 0.1MPa, and the internal pressure of the condenser 2 is 4.9KPa; by utilizing the height difference and the internal pressure difference, condensed water in the boiler drainage flash tank 1 can be automatically discharged into a drainage collecting pipe 21 of the condenser 2, the water attack phenomenon is eliminated, the water attack risk is eliminated, and the industrial power consumption is saved without starting a drainage pump;

the water conveying pipeline 3 is provided with a U-shaped water sealing section 31, and the U-shaped water sealing section 31 is formed by descending the water conveying pipeline 3 to a negative meter mark and then rising to the height of 0 meter; the U-shaped water seal section 31 plays a role in blocking air circulation in the water conveying pipeline 3, and prevents air from flowing into the condenser so as to prevent the risk of low vacuum degree of the condenser;

water pipe 3 is pressed close to hydrophobic header 21 one side and is provided with pneumatic control valve 5, be provided with level sensor 6 in the hydrophobic flash tank 1 of boiler, level sensor 6 is connected with 7 electricity of outside DCS control end, outside DCS control end 7 is connected with pneumatic control valve 5 electricity, in operation, level sensor 6 can feed back outside DCS control end 7 according to the automatic regulation aperture of water level height switch, outside DCS control end 7 need not artificial control according to the normal drainage of liquid level signal control pneumatic control valve 5 regulation aperture assurance drain tank.

The above-mentioned only be the embodiment of the present invention, not consequently the restriction of the patent scope of the present invention, all utilize the equivalent structure or equivalent flow transform made of the content of the specification and the attached drawings, or directly or indirectly use in other relevant technical fields, all including in the same way the patent protection scope of the present invention.

Claims

1. The utility model provides a power plant boiler fan heater drain line structure which characterized in that: the boiler water draining expansion tank comprises a boiler water draining expansion tank (1) and a condenser (2), wherein the condenser (2) is provided with a water draining collecting pipe (21), the water draining end of the boiler water draining expansion tank (1) is communicated to the water draining collecting pipe (21) through a water conveying pipeline (3), a height difference exists between the water draining end of the boiler water draining expansion tank (1) and the water draining collecting pipe (21), and the internal pressure of the boiler water draining expansion tank (1) is larger than the internal pressure of the condenser (2).

2. The utility boiler fan heater drain line structure of claim 1, characterized in that: the drainage end of the boiler drainage flash tank (1) is located at the elevation of 10 meters, and the drainage header (21) is located at the elevation of 0 meter.

3. The utility boiler fan heater drain line structure of claim 1, characterized in that: the internal pressure of the boiler drainage flash tank (1) is 0.1MPa, and the internal pressure of the condenser (2) is 4.9KPa.

4. The utility boiler fan heater drain line structure of claim 1, characterized in that: the water conveying pipeline (3) is provided with a U-shaped water sealing section (31), and the U-shaped water sealing section (31) is formed by descending the water conveying pipeline (3) to a negative meter mark and then rising to a height of 0 meter.

5. The steam trap of claim 1, wherein the steam trap further comprises: and a manual valve (4) is arranged on one side of the water delivery pipeline (3) close to the drainage end of the boiler drainage flash tank (1).

6. The steam trap of claim 1, wherein the steam trap further comprises: the boiler is characterized in that a pneumatic adjusting valve (5) is arranged on one side, close to the drain collecting pipe (21), of the water conveying pipeline (3), a liquid level sensor (6) is arranged in the boiler drain expansion tank (1), the liquid level sensor (6) is electrically connected with an external DCS control end (7), and the external DCS control end (7) is electrically connected with the pneumatic adjusting valve (5).