CN214948972U - Spare boiler pipeline anti-freezing system formed by using operating boiler blow-down water - Google Patents

Abstract

The utility model provides a spare boiler pipeline anti-freezing system formed by using the drainage water of an operating boiler, the continuous drainage water of a spare boiler steam pocket and an adjacent operating boiler steam pocket is respectively led into a continuous drainage expander through a spare continuous drainage pipeline with a continuous drainage first valve and a secondary valve and an operating continuous drainage pipeline, and the continuous drainage pipeline is positioned at the downstream of the corresponding continuous drainage first valve and the secondary valve between the operating continuous drainage pipeline and the spare continuous drainage pipeline and is communicated with a water inlet pipe with a water inlet valve; on the spare continuous-discharge pipeline, a by-pass pipe with a by-pass valve is additionally arranged between the upstream of the continuous-discharge primary valve and the downstream of the continuous-discharge secondary valve, and a downcomer and a water-cooled wall pipeline are arranged between a spare boiler steam drum and a water-cooled wall lower header and are communicated with an economizer through a recirculation pipeline with a recirculation valve. The utility model discloses can reduce water resource quantity, also not influence the feedwater volume of operation boiler, when playing the utility of preventing frostbite to reserve boiler pipeline, the safety and stability of guarantee operation boiler moves.

Description

Spare boiler pipeline anti-freezing system formed by using operating boiler blow-down water

Technical Field

The utility model relates to a boiler system, the more specifically reserve boiler pipeline anti-freezing system who utilizes operation boiler blow-down water to form that says so.

Background

Power plant or thermal power station all have the freeze-proof problem of reserve boiler pipe, and especially the boiler is longer in winter blowing out time, if not carry out the boiler pipe and prevent frostbite, the pipeline frost crack can appear after the boiler pipe is gone up to freeze, destroys the all kinds of toughness strength of pipeline, and the pipeline material changes, because of the boiler pipe all is high temperature high pressure material, if the problem more than appearing can influence the boiler and make it unable reserve, can influence boiler safety coefficient when serious, can not start.

At present, the antifreezing operation of the boiler in winter is generally carried out by feeding water to the boiler, but the waste of water resources is large, and the feed water quantity of the operating boiler can be influenced if the water feeding quantity is large.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving above-mentioned technical problem to a certain extent at least. Therefore, the utility model provides an utilize reserve boiler pipeline anti-freezing system of operation boiler blow off water formation reduces water resource quantity, does not influence the water supply volume of operation boiler yet, when playing the utility of preventing frostbite to reserve boiler pipeline, ensures the safety and stability operation of operation boiler.

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

the utility model provides an utilize reserve boiler pipeline anti-freezing system that operation boiler blow off water formed which structural feature is:

the continuous drainage water of the standby boiler steam pocket and the adjacent operating boiler steam pocket is respectively introduced into a continuous drainage flash tank through a standby continuous drainage pipeline with a continuous drainage primary valve and a secondary valve and an operating continuous drainage pipeline, and the continuous drainage pipeline and the standby continuous drainage pipeline are positioned at the downstream of the corresponding continuous drainage primary valve and the secondary valve and are communicated through a water inlet pipe with a water inlet valve;

a bypass pipe with a bypass valve is additionally arranged between the upstream of the primary continuous-discharge valve and the downstream of the secondary continuous-discharge valve on the standby continuous-discharge pipeline, a downcomer and a water-cooled wall pipeline are arranged between the standby boiler steam drum and the water-cooled wall lower header, and the downcomer and the water-cooled wall pipeline are communicated with the economizer through a recirculation pipeline with a recirculation valve;

the lower water wall header is communicated to a main fixed-discharge pipe of the boiler through a fixed-discharge pipeline with a fixed-discharge primary valve and a fixed-discharge secondary valve, the main fixed-discharge pipe of the boiler is communicated to a fixed-discharge flash tank through a fixed-discharge main pipeline with a fixed-discharge main valve, and is discharged to a trench through a first drain pipe with a first drain valve and is discharged to a drain tank of the boiler through a second drain pipe with a second drain valve.

Further, when the continuous drainage of the steam drum of the operating boiler is used for preventing the standby boiler from freezing:

the continuous drainage of the running continuous drainage pipeline close to the running boiler steam pocket is introduced into the standby continuous drainage pipeline through a water inlet pipe and is introduced into the standby boiler steam pocket through a bypass pipe;

the standby boiler steam drum forms natural water circulation between the standby boiler steam drum and a lower header of a water-cooled wall through a down pipe and a water-cooled wall pipeline, and forms external circulation between the standby boiler steam drum and an economizer through a recirculation pipeline after the natural water circulation is finished;

and after the external circulation is finished, the fixed-discharge main valve is set to be in a closed state, the fixed-discharge primary valve and the fixed-discharge secondary valve are set to be in an open state, and the water level balance of the standby boiler steam drum is kept by adjusting the opening degree of the first drain valve.

Compared with the prior art, the utility model discloses beneficial effect embodies:

the utility model discloses the steam-water system that the even drainage that the utilization was close to the operation boiler passed through the pipeline and is introduced reserve boiler can keep certain pressure in reserve boiler, promotes reserve boiler water and from lower to upper flow, can satisfy the water formation natural circulation among the boiler steam-water system, and protection boiler pipe does not freeze, and inside the oxygen access system in the while also can prevent the air, the oxidation corrosion of elimination metal inner wall. And the continuous drainage is introduced into the economizer and then returns to the spare boiler drum through a recirculation pipeline by utilizing the pressure difference of the spare boiler drum, so that the pipeline of the economizer is prevented from being frozen; in addition, the water level balance of the standby boiler steam drum can be kept by utilizing the matching of the valves and adjusting the opening degree of the first drain valve. The utility model discloses to the chemical industry enterprise boiler stop operating duration in winter long, for the reserve demand that prevents the pipeline and freeze of protection boiler and propose, be an energy-conserving economy based on recycle design, prevent frostbite effect very effectual reserve boiler pipeline anti-freezing system.

Drawings

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

In the figure, 1, a boiler drum is operated; 2, running a continuous exhaust pipeline; 3, arranging a primary valve and a secondary valve in series; 4, a water inlet pipe; 5, a water inlet valve; 6, a flash tank is arranged in series; 7, a standby boiler steam drum; 8, standby continuous drainage pipelines; 9 a bypass pipe; 10 a bypass valve; 11 water wall lower header; 12 a down pipe; 13 water wall piping; 14, a coal economizer; 15 a recirculation conduit; 16 a recirculation valve; 17 arranging pipelines regularly; 18 fixed discharge primary and secondary valves; 19, arranging a main pipe in a fixed row of the boiler; 20 rows of main pipelines; 21 fixed-discharge main valve; 22 fixed-row flash tanks; 23 a first drain pipe; 24 a first trap; 25, trench digging; 26 a second hydrophobic pipe; 27 a second trap; 28 boiler drain box.

Detailed Description

To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the embodiments of the present invention are combined to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Referring to fig. 1, the standby boiler pipe anti-freezing system formed by using the blowdown water of the operating boiler of the present embodiment is configured as follows:

the continuous drainage water of the standby boiler steam drum 7 and the adjacent operating boiler steam drum 1 is respectively led into a continuous drainage flash tank 6 through a standby continuous drainage pipeline 8 with a continuous drainage first valve and a secondary valve 3 and an operating continuous drainage pipeline 2, and the continuous drainage pipeline 2 and the standby continuous drainage pipeline 8 are positioned at the downstream of the corresponding continuous drainage first valve and the secondary valve 3 and are communicated through a water inlet pipe 4 with a water inlet valve 5;

a bypass pipe 9 with a bypass valve 10 is additionally arranged on the spare continuous exhaust pipeline 8 between the upstream of the continuous exhaust primary valve and the downstream of the continuous exhaust secondary valve, a downcomer 12 and a water wall pipeline 13 are arranged between the spare boiler steam drum 7 and a water wall lower header 11, and the downcomer and the water wall pipeline are communicated with an economizer 14 through a recirculation pipeline 15 with a recirculation valve 16;

the water wall lower header 11 is communicated with a boiler fixed-row main pipe 19 through a fixed-row pipeline 17 with a fixed-row first valve 18 and a fixed-row secondary valve 18, the boiler fixed-row main pipe 19 is communicated with a fixed-row flash tank 22 through a fixed-row main pipeline 20 with a fixed-row main valve 21, and is discharged to a trench 25 through a first drain pipe 23 with a first drain valve 24 and is discharged to a boiler drain tank 28 through a second drain pipe 26 with a second drain valve 27.

In the concrete implementation, when the continuous drainage of the operating boiler steam drum 1 is used for preventing the standby boiler pipeline from freezing:

the continuous drainage of the running continuous drainage pipeline 2 adjacent to the running boiler steam drum 1 is introduced into a standby continuous drainage pipeline 8 through a water inlet pipe 4 and is introduced into a standby boiler steam drum 7 through a bypass pipe 9;

the standby boiler steam drum 7 forms natural water circulation between the standby boiler steam drum and a water wall lower header 11 through a downcomer 12 and a water wall pipeline 13, and forms external circulation between the standby boiler steam drum and an economizer 14 through a recirculation pipeline 15 after the natural water circulation is finished;

after the external circulation is completed, the fixed-discharge main valve 21 is set to be in a closed state, the fixed-discharge primary valve 18 and the fixed-discharge secondary valve 18 are set to be in an open state, and the opening degree of the first drain valve 24 is adjusted to keep the water level balance of the standby boiler drum 7.

The system can be implemented according to the following steps:

opening a first continuous drainage valve 3 and a second continuous drainage valve 3 on an operation continuous drainage pipeline 2 of an operation boiler steam pocket 1, opening a water inlet valve 5 on a water inlet pipe 4, opening a bypass valve 10 on a bypass pipe 9, keeping the first continuous drainage valve 3 and the second continuous drainage valve 3 on a standby continuous drainage pipeline 8 closed, introducing continuous drainage of the operation boiler into the standby continuous drainage pipeline 8 through the water inlet pipe 4 through the operation continuous drainage pipeline 2, and introducing the continuous drainage into a standby boiler steam pocket 7 through the bypass pipe 9;

after entering the spare boiler drum 7, the water is led to the water wall lower header 11 through the downcomer 12, and then is led into the spare boiler drum 7 through the water wall pipeline 13 from the water wall lower header 11 to form natural water circulation;

then, opening a recirculation valve 16 on the circulation pipeline, introducing continuous drainage of the standby boiler steam pocket 7 into an inlet of the economizer 14 through a recirculation pipeline 15 by utilizing the pressure difference of the standby boiler steam pocket 7, and then introducing the continuous drainage into the standby boiler steam pocket 7 through an outlet of the economizer 14 to form external circulation so as to protect the pipeline of the economizer 14 and prevent the pipeline from freezing, wherein A in the figure 1 is a water supply pipeline of the economizer;

and closing the fixed-discharge main valve 21, opening the fixed-discharge primary valve 18 and the fixed-discharge secondary valve 18, and adjusting the opening degree of the first drain valve 24 to keep the water level of the standby boiler steam drum 7 balanced.

Because the continuous drainage water of the operating boiler contains no oxygen, the pH value is 9-10.5, and the continuous drainage water has certain pressure, the temperature is above 200 ℃, and is higher than the saturated water temperature under normal pressure. After the water is input into a steam-water system of the standby boiler through the pipeline, certain pressure can be kept in the standby boiler, the water of the standby boiler is promoted to flow from bottom to top, the natural circulation of the water in the steam-water system of the boiler can be met, the pipeline of the boiler is protected from being frozen, meanwhile, oxygen in the air can be prevented from entering the inside of the system, and the oxidation corrosion of the inner wall of metal is eliminated. When the water level in the spare boiler drum 7 reaches 50%, the opening of the first steam trap 24 on the first steam trap 23 discharging to the trench 25 can be adjusted to keep the water balance of the spare boiler.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (1)

1. The utility model provides an utilize reserve boiler pipeline anti-freezing system that operation boiler blow off water formed which characterized by:

the continuous drainage water of the standby boiler steam pocket and the adjacent operating boiler steam pocket is respectively introduced into a continuous drainage flash tank through a standby continuous drainage pipeline with a continuous drainage primary valve and a secondary valve and an operating continuous drainage pipeline, and the continuous drainage pipeline and the standby continuous drainage pipeline are positioned at the downstream of the corresponding continuous drainage primary valve and the secondary valve and are communicated through a water inlet pipe with a water inlet valve;

a bypass pipe with a bypass valve is additionally arranged between the upstream of the primary continuous-discharge valve and the downstream of the secondary continuous-discharge valve on the standby continuous-discharge pipeline, a downcomer and a water-cooled wall pipeline are arranged between the standby boiler steam drum and the water-cooled wall lower header, and the downcomer and the water-cooled wall pipeline are communicated with the economizer through a recirculation pipeline with a recirculation valve;

the lower water wall header is communicated to a main fixed-discharge pipe of the boiler through a fixed-discharge pipeline with a fixed-discharge primary valve and a fixed-discharge secondary valve, the main fixed-discharge pipe of the boiler is communicated to a fixed-discharge flash tank through a fixed-discharge main pipeline with a fixed-discharge main valve, and is discharged to a trench through a first drain pipe with a first drain valve and is discharged to a drain tank of the boiler through a second drain pipe with a second drain valve.

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