KR20180064757A - Apparatus and method for washing nozzle pipe of boiler - Google Patents

Abstract

Disclosed is a cleaning apparatus of a boiler nozzle pipe. The cleaning apparatus of a boiler nozzle pipe according to an embodiment of the present invention comprises: a cleaning pipe which can be inserted into a nozzle pipe; a plurality of spray holes formed along the outer periphery of the cleaning pipe at least in part along the longitudinal direction of the cleaning pipe; a rotary pipe installed to be able to rotate relative to the cleaning pipe by a gas pressure introduced into the cleaning pipe in one area along the longitudinal direction of the cleaning pipe and having a plurality of spray holes along the outer circumference; and a gas supply pipe connected to one side of the cleaning pipe to supply gas, including at least one of high temperature steam and high pressure gas, to the cleaning pipe.

Description

Technical Field [0001] The present invention relates to a cleaning apparatus and a cleaning method for a boiler nozzle piping,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning device and a cleaning method for a boiler nozzle piping, and more particularly, to a cleaning device and a cleaning method that are easy to remove foreign substances fixed to a nozzle pipe.

Generally, the by-product gas of steel mills is blast furnace gas (BFG), a by-product from blast furnace, Linz Donawitz Gas (LDG) generated in steelmaking process, and Cokes Oven Gas : COG). These by-products are transported as fuel for heating the boilers of the cogeneration facilities in the steelworks through pipelines.

The conversion gas generated during the steelmaking process is about twice as high as the blast furnace gas, which is effective in increasing the output of the power plant. These converter gases include carbon monoxide, branching, foreign substances, carbon dioxide, nitrogen, hydrogen, and the like.

On the other hand, in the boiler burner, a converter gas nozzle piping is installed to distribute the by-product gas uniformly. When the nozzle piping is exposed to dust and foreign matter contained in the by-product gas for a long time, dust and foreign matter are fixed to the inner wall of the nozzle piping Resulting in a problem of facility malfunction.

Korean Patent Publication No. 2004-0020619 (published on March 30, 2004)

Embodiments of the present invention provide a boiler nozzle piping cleaning apparatus and method that can efficiently perform cleaning of a nozzle piping of a boiler.

According to an aspect of the present invention, there is provided a cleaning apparatus comprising: a cleaning pipe that can be inserted into a nozzle pipe; a plurality of injection holes formed along an outer surface of the cleaning pipe at least in part along the longitudinal direction of the cleaning pipe; And a plurality of spray holes are formed along an outer circumference of the rotary pipe, and a high-temperature steam is supplied to the cleaning pipe, And a gas supply pipe connected to one side of the cleaning pipe to supply a gas containing at least one of the high-pressure gas and the high-pressure gas.

The gas supply pipe is provided with a steam pipe branching from one side and supplied with the high temperature steam and equipped with an on-off valve, a gas pipe branched from the other side to supply the high-pressure gas and equipped with an on- .

The injection hole may be inclined upwards toward the longitudinal end of the washing pipe.

In addition, a bearing member for relatively rotating the rotary pipe is provided at both ends of the rotary pipe, and a rotation induction blade for rotating the rotary pipe by the pressure of the gas is provided in the rotary pipe .

The cleaning piping and the gas supply piping may be detachably connected.

In addition, the rotation inducing vane may be coupled to an outer surface of the hub, one end of the rotation inducing vane being positioned at an inner center of the rotation pipe, and the other end thereof may be coupled to the inner surface of the rotation pipe to rotate together with the rotation pipe.

The center of the hub may be open, and the hub may be provided with a flow guide plate for transmitting a flow of gas entering the hub toward the rotation inducing vane.

According to another aspect of the present invention, there is provided a method of cleaning a boiler nozzle pipe, comprising the steps of inserting a wash pipe along the longitudinal direction of the nozzle pipe, supplying hot steam to the wash pipe, The steam is sprayed to the inner wall of the nozzle pipe while a rotary air flow is formed in the nozzle pipe by using a rotary pipe installed to be rotated by the rotary pipe, and nitrogen or air of high pressure is supplied to the cleaning pipe after the steam supply is completed, And a cleaning method of the boiler nozzle piping to remove foreign matter adhering to the nozzle piping by spraying the nozzle piping on the inner wall of the nozzle piping through the cleaning piping.

The embodiments of the present invention can efficiently remove foreign matter adhering to the inner wall of the nozzle pipe while supplying steam and gas alternately by injecting the cleaning pipe during the cleaning of the nozzle pipe.

Embodiments of the present invention also improve the cleaning efficiency by uniformly supplying the steam and gas to the entire nozzle pipe by spraying steam and gas using a rotary pipe rotating by steam or gas pressure when steam and gas are sprayed into the nozzle pipe .

1 schematically shows a converter gas nozzle piping of a boiler according to an embodiment of the present invention.
2 shows a boiler nozzle piping cleaning apparatus according to an embodiment of the present invention.
3 is a cross-sectional view of a portion of a rotating piping in accordance with an embodiment of the present invention.
FIG. 4 shows a steam flow in a state in which a steam pipe according to an embodiment of the present invention is opened.
5 shows a gas flow in a state in which a gas pipe is opened according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments described below are provided by way of example so that those skilled in the art will be able to fully understand the spirit of the present invention. The present invention is not limited to the embodiments described below, but may be embodied in other forms. In order to clearly explain the present invention, parts not related to the description are omitted from the drawings, and the width, length, thickness, etc. of the components may be exaggerated for convenience. Like reference numerals designate like elements throughout the specification.

FIG. 1 is a schematic view of a converter gas nozzle piping of a boiler according to an embodiment of the present invention. FIG. 2 illustrates a boiler nozzle pipeline cleaning apparatus according to an embodiment of the present invention, and FIG. Sectional view of a portion of a rotating piping according to an example.

1 to 3, a boiler nozzle piping cleaning device 20 according to an embodiment of the present invention includes a device for efficiently removing foreign substances adhered to the inner wall of a nozzle pipe 10 of a fuel provided in a combustion chamber of a boiler, to be.

The converter gas generated in the steelmaking facility is supplied to the combustion chamber of the boiler through the nozzle piping 10, but the converter gas includes components such as carbon monoxide, carbon dioxide, dust, N2, hydrogen, and foreign substances. Accordingly, dust and foreign matter are fixed to the inner wall of the nozzle pipe 10 when used for a long period of time, so that the cleaning device 20 is an apparatus for easily removing such foreign matter.

The boiler nozzle piping cleaning apparatus 20 may be composed of a cleaning piping 30 and a gas supply piping 40 detachably connected to the cleaning piping 30.

The cleaning piping 30 and the gas supply piping 40 are separated from each other in order to facilitate the transportation of the cleaning apparatus 20 in the present embodiment. May be integrally formed.

The washing piping 30 may be provided in the form of a hollow tube having a long length from one end to the other end and may be provided at the rear end of the washing piping 30 with a screw thread formed on the outer surface thereof (31) may be provided.

A plurality of injection holes 32 may be formed on the front side of the washing pipe 30 for injecting a high pressure gas supplied into the washing pipe 30 in a state where the washing pipe 30 is inserted into the nozzle pipe 10 have.

The plurality of injection holes 32 may be arranged to be upwardly inclined toward the upper end of the washing pipe 30 to facilitate separation of foreign matter adhered to the inner wall of the nozzle pipe 10.

Further, the plurality of injection holes 32 may be arranged to be spaced a predetermined distance along the longitudinal direction and the circumferential direction of the washing pipe 30. [

A rotary pipe 50 for forming a rotary airflow in the nozzle pipe 10 may be installed in the middle of the cleaning pipe 30 when the gas is injected through the plurality of injection holes 51.

The rotary pipe 50 is installed to be relatively rotatable in the cleaning pipe 30 by using the pressure of the gas delivered through the cleaning pipe 30 and has a plurality of injection holes 51 So that a rotating airflow is formed in the nozzle piping 10. Accordingly, it is possible to efficiently remove foreign matter adhering to the inner wall of the nozzle pipe 10, which is not reached by the gas discharged by the plurality of injection holes 32 provided in the cleaning pipe 30.

The rotary pipe 50 may have a diameter relatively larger than the diameter of the cleaning pipe 30 and may have a diameter slightly smaller than the diameter of the nozzle pipe 10.

The rotary piping 50 may be installed to be relatively rotatable relative to the cleaning piping 30 at any point along the longitudinal direction of the cleaning piping 30 or may be installed to be rotatable at the front end of the cleaning piping 30 have.

For this purpose, the rotary pipe 50 may have a hollow cylindrical shape, and a bearing member 60 may be disposed at the front and rear ends of the rotary pipe 50 to allow the rotary pipe 50 to rotate relative to the cleaning pipe 30.

The bearing member 60 may include a ball bearing in which the inner ring 61 is fixed to the outer surface of the cleaning pipe 30 and the outer ring 62 is fixed to the inner surface of the rotary pipe 50.

The clearance between the rotary pipe 50 and the cleaning pipe 30 may be sealed by a sealing member 70 such as an O-ring to prevent leakage of gas in the area adjacent to the bearing member 60.

A rotation induction vane 80 for inducing the rotation of the rotary pipe 50 by the pressure of the gas flowing into the rotary pipe 50 through the cleaning pipe 30 may be provided inside the rotary pipe 50 have.

The rotary induction vane 80 may be provided along the outer circumferential surface of the hub 81 disposed at the center of the rotary pipe 50 and may be connected to the rotary pipe 50 by the pressure of the gas flowing into the rotary pipe 50. [ So that the outer circumferential surface thereof can be fixed to the inner wall of the rotary pipe 50.

The center of the hub 81 may be provided in such a manner that the gas introduced into the rotary pipe 50 is opened to smoothly transfer the gas into the cleaning pipe 30 located in front of the rotary pipe 50.

The rotary induction vane 80 is disposed inside the rotary pipe 50 so that the rotary pipe 50 can be rotated by the pressure of the gas introduced into the rotary pipe 50. Alternatively, It is needless to say that the rotary pipe 50 may be rotated by forming the ejection direction of the plurality of injection holes 51 in a direction in which the rotary pipe 50 can rotate.

It goes without saying that the position of the rotation inducing vane 80 disposed inside the rotary pipe 50 may be appropriately changed in the rotary pipe 50 in accordance with the flow direction of the gas flowing into the rotary pipe 50.

The hub 81 supporting the inner side of the rotary guide vane 80 is further provided with a flow guide plate 83 having a guide surface 82 for guiding the flow entering the hub 81 toward the rotary guide vane 80 Can be installed.

The gas supply pipe 40 is for supplying the gas toward the cleaning pipe 30, and the inside thereof may be provided in the form of an empty hollow tube.

The gas supply pipe 40 may be provided at its tip with a coupling portion 41 having an inner peripheral surface threaded to be coupled with the coupling portion 31 of the cleaning pipe 30 in a screwing manner, A lever 42 extending perpendicularly to the gas supply pipe 40 may be provided.

Here, although the gas supply pipe 40 and the cleaning pipe 30 are detachably coupled by a screw fastening method, they can be detached from each other through a known connector or one-touch fitting capable of being mounted in a one-touch manner Lt; / RTI >

A steam pipe 43 and a gas pipe 44 are provided in the middle of the gas supply pipe 40 and are branched from the gas supply pipe 40 so as to communicate with the inside of the gas supply pipe 40.

The steam piping 43 may be connected to the steam hose 45 for transferring the steam supplied from the steam supply source by a one-touch fitting or a connector method, and may be connected to the opening / closing valve for selectively supplying the supplied steam to the gas supply pipe 40 (46) may be provided.

The gas piping 44 may be connected by a one-touch fitting or a connector method to the gas hose 47 that transfers nitrogen or air supplied from a gas supply source and may be connected to the gas supply piping 40 to selectively supply the supplied gas to the gas supply piping 40 An opening / closing valve 48 may be provided.

Accordingly, the user selectively operates the open / close valves 46 and 48 installed in the steam pipe 43 or the gas pipe 44 to open or close the steam pipe or the open / close valve 46 or 48 to supply steam or gas to the gas supply pipe 40. Wherein the gas supplied from the gas source may comprise high pressure air or nitrogen.

Hereinafter, the operation of the boiler nozzle piping cleaning apparatus according to the embodiment of the present invention will be described. FIG. 4 shows a steam flow in a state in which a steam pipe according to an embodiment of the present invention is opened, and FIG. 5 shows a gas flow in a state in which a gas pipe according to an embodiment of the present invention is opened.

The operator grips the lever 42 of the cleaning apparatus 20 to clean the nozzle piping 10 through the opening of the nozzle piping 10 in the state where the foreign substance is fixed to the inside of the nozzle piping 10 of the boiler converter gas, The pipe 30 is injected. At this time, the steam hose 45 and the gas hose 47 are connected to the steam pipe 43 and the gas pipe 44, respectively, and the open / close valves 46 and 48 respectively close the corresponding oil passages.

The steam supplied from the steam hose 45 is supplied to the gas supply pipe 40 through the valve of the steam pipe 45 by operating the lever of the open / close valve 46 provided in the steam hose 45, To the washing piping (30).

The steam supplied to the washing pipe 30 is injected toward the inner wall of the nozzle pipe 10 through the washing pipe 30 and the plurality of injection holes 32 and 51 formed in the rotary pipe 50. At this time, the rotary pipe 50 is rotated by the pressure of the supplied steam and is sprayed toward the inner wall of the nozzle pipe 10 to form a rotary air flow, thereby supplying the steam evenly to the entire inner wall of the nozzle pipe 10.

The high-temperature steam supplied to the nozzle piping 10 weakens the adhering force of the foreign matter adhered to the nozzle piping 10.

After a predetermined time has elapsed, the operator operates the opening / closing valve 46 of the steam pipe 43 as shown in FIG. 5 to close the oil passage and then operates the opening / closing valve 48 of the gas pipe 44, Lt; / RTI >

The gas such as nitrogen or air supplied through the gas hose 47 is delivered to the cleaning pipe 30 through the gas supply pipe 40 and is supplied to the cleaning pipe 30 and the spray hole 30 formed in the rotary pipe 50 (32, 51) to the inner wall of the nozzle pipe (10).

Accordingly, the foreign matter having a weak adhesion force due to the steam is separated from the inner wall of the nozzle pipe 10 by the pressure of the gas to be sprayed, and the separated foreign substances are separated and discharged to the outside through a drain line (not shown).

The foregoing has shown and described specific embodiments. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined in the appended claims.

10: nozzle piping, 20: cleaning device,
30: cleaning piping, 40: gas supply piping,
42: lever, 43: steam piping,
44: gas piping, 50: rotary piping,
60: bearing member, 70: sealing member,
80: rotation induction wing, 81: hub,
82: guide surface, 83: flow guide plate.

Claims (8)

A cleaning piping that can be inserted into the nozzle piping;
A plurality of spray holes formed along an outer surface of the washing pipe at least in part along the longitudinal direction of the washing pipe;
A rotary pipe installed to be rotatable relative to the washing pipe by a gas pressure introduced into the washing pipe in a certain region along the longitudinal direction of the washing pipe and having a plurality of spray holes formed along an outer periphery thereof; And
And a gas supply pipe connected to one side of the cleaning pipe to supply a gas containing at least one of high-temperature steam and high-pressure gas to the cleaning pipe. The method according to claim 1,
A gas pipe branched from one side of the gas supply pipe and supplied with the high-temperature steam and provided with an on-off valve, a gas pipe branched from the other side to supply the high-pressure gas and equipped with an open / close valve, and a lever for gripping an operator Boiler nozzle piping cleaning device. The method according to claim 1,
Wherein the spray hole is provided to be inclined upward toward a longitudinal direction end of the washing pipe. The method according to claim 1,
Wherein a bearing member for relatively rotating the rotary pipe is provided at both ends of the rotary pipe,
And a rotation induction blade for rotating the rotary pipe by pressure of the gas is provided in the rotary pipe. The method according to claim 1,
Wherein the cleaning piping and the gas supply piping are detachably connected to each other. 5. The method of claim 4,
Wherein the rotation inducing vane is coupled to an outer surface of a hub having one end located at an inner center of the rotary pipe and the other end is coupled to an inner surface of the rotary pipe to rotate together with the rotary pipe. The method according to claim 6,
The center of the hub is provided in an open form,
Wherein the hub is provided with a flow guide plate for transmitting a flow of gas entering the hub toward the rotary guide vane. A method of cleaning a boiler nozzle piping,
A cleaning pipe was inserted along the longitudinal direction of the nozzle pipe,
The steam is sprayed to the inner wall of the nozzle pipe while forming a rotating air flow inside the nozzle pipe by using a rotary pipe provided to rotate by the pressure of the steam in the washing pipe by supplying high temperature steam to the washing pipe,
Wherein the high-pressure nitrogen or air is supplied to the cleaning pipe after the steam supply is completed, and the foreign substances adhered to the nozzle pipe are removed by spraying the high-pressure nitrogen or air through the rotary pipe and the cleaning pipe to the inner wall of the nozzle pipe.

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