阅读说明：本技术 一种锅炉吹管期间疏水回收系统及方法 (Drainage recovery system and method during boiler blowpipe period ) 是由 刘世雄 刘继锋 王涛 刘岗 令彤彤 辛志波 谈博 李洲 顿小宝 于 2020-07-22 设计创作，主要内容包括：本发明公开了一种锅炉吹管期间疏水回收系统及方法,包括汽水分离器、扩容器、锅炉疏水泵系统、主管道、除氧器及给水泵；给水泵的出口与锅炉的入口相连通,汽水分离器经扩容器、锅炉疏水泵系统、主管道及除氧器与给水泵的入口相连通,主管道依次设置有第一截止阀、第一滤网及第二截止阀,该系统及方法实现锅炉吹管期间疏水回收至除氧器,减少除盐水浪费,实现工质热量回收,提高给水温度进而节省燃料。(The invention discloses a drain recovery system and a drain recovery method during a boiler blow pipe period, wherein the drain recovery system comprises a steam-water separator, a flash tank, a boiler drain pump system, a main pipeline, a deaerator and a feed pump; the system and the method have the advantages that the outlet of the water supply pump is communicated with the inlet of the boiler, the steam-water separator is communicated with the inlet of the water supply pump through the flash tank, the boiler drainage pump system, the main pipeline and the deaerator, the main pipeline is sequentially provided with the first stop valve, the first filter screen and the second stop valve, drainage is recovered to the deaerator during the period of blowing of the boiler, waste of desalted water is reduced, heat recovery of working media is achieved, the water supply temperature is improved, and further fuel is saved.)

1. The drain recovery system during the boiler blow pipe period is characterized by comprising a steam-water separator (1), a flash tank (2), a boiler drain pump system (4), a main pipeline (12), a deaerator (7) and a feed pump (10); the outlet of a water feeding pump (10) is communicated with the inlet of a boiler, a steam-water separator (1) is communicated with the inlet of the water feeding pump (10) through a flash tank (2), a boiler drainage pump system (4), a main pipeline (12) and a deaerator (7), and the main pipeline (12) is sequentially provided with a first stop valve (14), a first filter screen (8) and a second stop valve (15).

2. Boiler blow pipe period drain recovery system according to claim 1, characterized in that between the main pipe (12) and the boiler drain pump system (4) there is arranged a main valve (5) and a drain regulating valve (6).

3. Boiler blowpipe period hydrophobic recovery system in accordance with claim 1, characterized by that the main pipe (12) is in parallel connected with a bypass pipe (13), wherein the bypass pipe (13) is provided with a third stop valve (16), a second screen (9) and a fourth stop valve (17) in sequence.

4. Boiler blow pipe hydrophobic recovery system according to claim 1, characterized in that the boiler hydrophobic pump system (4) consists of two boiler hydrophobic pumps communicating in parallel.

5. Boiler blowpipe period hydrophobic recovery system as claimed in claim 1, characterized in that the main pipe (12) communicates with the inlet at the top of the deaerator (7).

6. The boiler blowpipe period drain recovery system of claim 1, characterized in that a condensate tank (3) is provided between the flash tank (2) and the boiler drain pump system (4).

7. The system for hydrophobic recovery during boiler blowpipe of claim 3, further comprising a backwash device for on-line backwashing of the first (8) and second (9) screens.

8. The system for drain recovery during boiler blowpipe according to claim 1, characterized in that the steam-water separator (1) is in communication with the flash tank (2) via boiler drain water piping (11).

9. A method for hydrophobic recovery during a blow tube of a boiler, comprising the steps of:

in the starting and running processes of the boiler, high-temperature drainage water and steam generated by the steam-water separator (1) are collected and then discharged into the flash tank (2) through the boiler drainage water pipeline (11), then the flash tank (2) expands the capacity and reduces the pressure to form saturated steam and saturated water, wherein the saturated water is discharged into the condensate water tank (3), the water output by the condensate water tank (3) is conveyed into the deaerator (7) through the boiler drainage pump system (4), and the feed water in the deaerator (7) is conveyed back to the boiler through the feed water pump (10).

Technical Field

The invention belongs to the technical field of boilers, and relates to a drainage recovery system and method during a boiler blowpipe period.

Background

During the blowpipe of thermal power factory, the boiler is in the wet operation, in order to guarantee minimum feedwater flow, maintains the normal liquid level of catch water, need to discharge into the hydrophobic flash vessel with the inside partial saturated water of catch water, and the hydrophobic flash vessel drainage of current unit is generally arranged outward or is discharged into the condenser.

Drainage causes waste of a large amount of desalted water, a large amount of desalted water is consumed by a boiler steam blowpipe, and drainage possibly causes that the desalted water making capacity cannot meet the requirement of a boiler continuous blowpipe. Draining the drained water into a condenser, wherein the condenser cannot bear a large amount of high-temperature drained water without vacuumizing; if the waste heat is discharged into a condenser in a vacuum state, obvious heat loss of the working medium can be caused. Meanwhile, in the process of blowing the pipe, if the unit vacuum system cannot be put into operation, the drainage pipe cannot be recovered, so that the blowing pipe is limited by the vacuum system, and the construction period is delayed or the progress of the blowing pipe is slow.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a drainage recovery system and a drainage recovery method during a boiler blow pipe period.

In order to achieve the aim, the drainage recovery system during the boiler blowpipe period comprises a steam-water separator, a flash tank, a boiler drainage pump system, a main pipeline, a deaerator and a feed pump; the outlet of the feed pump is communicated with the inlet of the boiler, the steam-water separator is communicated with the inlet of the feed pump through the flash tank, the boiler drainage pump system, the main pipeline and the deaerator, and the main pipeline is sequentially provided with a first stop valve, a first filter screen and a second stop valve.

A main valve and a drain regulating valve are arranged between the main pipeline and the boiler drain pump system.

The main pipeline is communicated with a bypass pipeline in parallel, wherein a third stop valve, a second filter screen and a fourth stop valve are sequentially arranged on the bypass pipeline.

The boiler drain pump system consists of two boiler drain pumps which are communicated in parallel.

The main pipeline is communicated with an inlet at the top of the deaerator.

A condensate water tank is arranged between the flash tank and the boiler drainage pump system.

The filter screen backwashing device further comprises a backwashing device for online backwashing of the first filter screen and the second filter screen.

The steam-water separator is communicated with the flash tank through a boiler drainage water pipeline.

The hydrophobic recovery method during the period of blowing the boiler pipe comprises the following steps:

in the starting and running processes of the boiler, high-temperature drainage water and steam generated by the steam-water separator are collected and then discharged into the flash tank through a boiler drainage water pipeline, then the flash tank expands and reduces the pressure to form saturated steam and saturated water, wherein the saturated water is discharged into the condensate water tank, the water output by the condensate water tank is conveyed into the deaerator through the boiler drainage pump system, and the feed water in the deaerator is conveyed back to the boiler through the feed pump.

The invention has the following beneficial effects:

during the specific operation, during the boiler blow pipe period, high-temperature drain water and steam in the steam-water separator enter the flash tank and are expanded and depressurized by the flash tank to form saturated steam and saturated water, the saturated water is discharged into the deaerator through the boiler drain pump system, the drain water returns to the deaerator to raise the water supply temperature, and the water in the deaerator finally returns to the boiler through the water supply pump, so that the recovery and heat utilization of working media are realized, the waste of desalted water is reduced, the water supply temperature of the boiler is raised, the fuel is saved, the system is simple to implement and convenient to operate, and the system has practical significance for continuously and smoothly completing the boiler blow pipe.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Wherein, 1 is catch water, 2 is the flash tank, 3 is the condensate tank, 4 is the boiler drain pump, 5 is the main valve, 6 is the drainage governing valve, 7 is the oxygen-eliminating device, 8 is first filter screen, 9 is the second filter screen, 10 is the feed pump, 11 is boiler drainage water pipe, 12 is the trunk line, 13 is the bypass pipeline, 14 is the first stop valve, 15 is the second stop valve, 16 is the third stop valve, 17 is the fourth stop valve.

Detailed Description

The invention is described in further detail below with reference to the accompanying drawings:

referring to fig. 1, the drainage recovery system during the boiler blow pipe period according to the present invention includes a steam-water separator 1, a flash tank 2, a boiler drainage pump system 4, a main pipeline 12, a deaerator 7, and a feed pump 10; the outlet of the water feeding pump 10 is communicated with the inlet of the boiler system, the steam-water separator 1 in the boiler system is communicated with the inlet of the water feeding pump 10 through the flash tank 2, the boiler drain pump system 4, the main pipeline 12 and the deaerator 7, and the main pipeline 12 is sequentially provided with a first stop valve 14, a first filter screen 8 and a second stop valve 15.

A main valve 5 and a drain regulating valve 6 are arranged between the main pipeline 12 and the boiler drain pump system 4; the main pipeline 12 is communicated with a bypass pipeline 13 in parallel, wherein the bypass pipeline 13 is sequentially provided with a third stop valve 16, a second filter screen 9 and a fourth stop valve 17; the boiler drain pump system 4 consists of two boiler drain pumps which are communicated in parallel; the main pipe 12 is communicated with an inlet at the top of the deaerator 7.

A condensate water tank 3 is arranged between the flash tank 2 and the boiler drain pump system 4; the invention also comprises a backwashing device for online backwashing of the first filter screen 8 and the second filter screen 9; the steam-water separator 1 is communicated with the flash tank 2 through a boiler drainage pipeline 11.

The hydrophobic recovery method during the period of blowing the boiler pipe comprises the following steps:

in the starting and running processes of the boiler, high-temperature drainage water and steam generated by the steam-water separator 1 are collected and then discharged into the flash tank 2 through the boiler drainage water pipeline 11, and then are subjected to capacity expansion and pressure reduction through the flash tank 2 to form saturated steam and saturated water, wherein the saturated water is discharged into the condensate water tank 3, the water output by the condensate water tank 3 is conveyed into the deaerator 7 through the boiler drainage pump system 4, and the feed water in the deaerator 7 is conveyed back to the boiler through the feed pump 10.

In addition, during actual operation, the drain flow entering the deaerator 7 is adjusted through the drain adjusting valve 6, and the drain enters the deaerator 7, so that the feed water temperature of the boiler can be increased, and fuel is saved.

In addition, a main pipeline 12 and a bypass pipeline 13 are arranged between the drain control valve 6 and the deaerator 7, a standby mode is adopted, when the filter screen in one pipeline is blocked during a blowing pipe period, the filter screen can be isolated through a front stop valve and a rear stop valve and switched to the other pipeline, the water feeding pump 10 is maintained to continuously operate, the continuous operation of the blowing pipe is ensured, the filter screen is cleaned without stopping the pump, and the number of times of machine set shutdown is reduced. The filter screens on the main pipeline 12 and the bypass pipeline 13 can filter partial impurities to ensure the water quality of the deaerator 7, the first filter screen 8 and the second filter screen 9 are provided with an online backwashing device, the filter screens are quickly cleaned, and the operation is simple and convenient.