CN-115815741-B - Cutting head device for flame cutting, underwater cutting equipment and underwater cutting method

Abstract

The invention discloses a flame cutting head device which comprises a first pipe body, a second pipe body and a third pipe body which are sequentially arranged from inside to outside, wherein the second pipe body is sleeved outside the first pipe body, the third pipe body is sleeved outside the second pipe body, a first gas channel is formed in the first pipe body, a second gas channel is formed between the second pipe body and the first pipe body, and a third gas channel is formed between the third pipe body and the second pipe body. According to the cutting head device for flame cutting, three gas channels are formed by arranging the three pipe bodies, the third gas channel and the second gas channel are annular channels, the gases in the first gas channel and the second gas channel are mixed and ignited to form flames for flame cutting, the gases in the third gas channel are used for forming an air cavity on the surface of a workpiece to be cut and discharging water in the air cavity during underwater cutting, so that the flames in the air cavity can be sustained, and underwater flame cutting is further achieved.

Inventors

• DENG CHUNYIN
• YIN SONG
• GAO WENJU
• LU ZHUANG
• CHEN GUOXING
• WU SHUHUI
• WEI SHAOLI
• LU HAIFENG
• LIU CHENGWEI
• SHI YILING
• PAN CHENYANG

Assignees

• 苏州热工研究院有限公司
• 中国广核集团有限公司
• 中国广核电力股份有限公司

Dates

Publication Date

20260512

Application Date

20221130

Claims (5)

1. 1. The underwater cutting equipment suitable for the radioactive metal waste is characterized by comprising a cutting pool, a frame, a rack and a cutting head device for flame cutting, wherein the frame is arranged in the cutting pool, the frame comprises a cross beam, an execution arm is arranged on the cross beam, and the cutting head device is arranged at the lower end of the execution arm; The cutting pool comprises a water inlet unit and a water outlet unit which are communicated with the space in the cutting pool, wherein the water inlet unit comprises a water inlet pipeline and a water inlet valve arranged on the water inlet pipeline; the cutting head device comprises an exhaust unit, wherein the exhaust unit comprises a gas collecting hood, an exhaust pipeline, a filter and an exhaust fan, the filter and the exhaust fan are arranged on the exhaust pipeline, the gas collecting hood is correspondingly arranged above the cutting head device, and the exhaust pipeline is communicated with the gas collecting hood; the monitoring component on the drainage pipeline is a dose monitor; the cutting head device comprises a first pipe body, a second pipe body and a third pipe body which are sequentially arranged from inside to outside, wherein the second pipe body is sleeved outside the first pipe body, and the third pipe body is sleeved outside the second pipe body; a first gas channel is formed in the first pipe body, a second gas channel is formed between the second pipe body and the first pipe body, and a third gas channel is formed between the third pipe body and the second pipe body; The air inlet device comprises a first air inlet pipe and second air inlet pipes distributed on the periphery of the first air inlet pipe, wherein the extending directions of the first air inlet pipe and the second air inlet pipe are the same, the first air inlet pipe is communicated with a first air channel, and the second air inlet pipe is communicated with a second air channel and a third air channel; the pipe comprises a connecting plate, wherein the connecting plate is used for adjacent pipe bodies, and a through hole penetrating through the wall thickness of the connecting plate is formed in the connecting plate; The connecting ring is used for connecting the air inlet pipe and the pipe body; the outlet of the third gas channel faces away from the first pipe body; the outlet of the second gas channel faces to the direction approaching to the first pipe body; The cross-sectional area ratio of the second gas channel to the third gas channel is 2-3:0.6-0.8; The lower end of the second pipe body is provided with a first part and a second part, the first part is inclined towards the first pipe body from top to bottom, the second part is inclined towards a direction away from the first pipe body from top to bottom, the lower end of the third pipe body is inclined towards a direction away from the first pipe body from top to bottom, the included angle between the first part of the second pipe body and the vertical surface is 8-12 degrees, the included angle between the second part of the second pipe body and the vertical surface is 12-18 degrees, and the included angle between the lower end of the third pipe body and the vertical surface is 12-18 degrees.
2. 2. The underwater cutting device of claim 1, wherein the gas flow rate at the outlet of the second gas passage is 100-150 m 3 /h, and the gas flow rate at the outlet of the third gas passage is 30-60 m 3 /h.
3. 3. The underwater cutting device as in claim 1 wherein the second portion of the second tube is inclined at the same angle as the lower end of the third tube.
4. 4. The underwater cutting apparatus of claim 1, wherein the drain pipe is further provided with a filter, a water pump, and a circulation pipe, a circulation water valve provided on the circulation pipe, the circulation pipe communicating the cutting tank and the drain pipe.
5. 5. A method of underwater cutting based on the underwater cutting device as claimed in any one of claims 1 to 4, comprising the steps of forming a first gas passage, a second gas passage and a third gas passage, the second gas passage being annularly surrounded on the outer periphery of the first gas passage, the third gas passage being annularly surrounded on the outer periphery of the second gas passage; Introducing gas into the second gas channel and the third gas channel, forming an air cavity on the surface of the workpiece to be cut, and discharging water in the air cavity to the outside of the air cavity; And introducing gas into the first gas channel, wherein the gas in the first gas channel is mixed with the gas in the second gas channel to form cutting flame for cutting the workpiece to be cut.

Description

Cutting head device for flame cutting, underwater cutting equipment and underwater cutting method Technical Field The invention belongs to the technical field of radioactive metal cutting, and particularly relates to a cutting head device suitable for underwater flame cutting, underwater cutting equipment comprising the cutting head device and a method for performing underwater flame cutting by utilizing the cutting head device. Background In nuclear power station retirement engineering, cutting and preparation are needed to be carried out on large-scale radioactive metals so as to reduce space occupation and achieve the aim of reducing waste disposal volume. The nuclear power retired and scrapped radioactive metal piece has the characteristics of large thickness, high radiation dosage and the like. The cutting method of the thick-wall metal comprises flame cutting, mechanical cutting and water cutting, wherein the flame cutting is the most mature cutting process for industrially cutting a thick and large steel plate (with the thickness of more than 100 mm), has the maximum thickness, the fastest speed and the highest efficiency, but generates a large amount of aerosol during cutting, and meanwhile, the radioactive dose of the cutting part is large and the irradiated dose of personnel is large. Disclosure of Invention In view of the above, an object of the present invention is to provide a cutting head device suitable for underwater flame cutting, with which underwater flame cutting of a workpiece can be achieved. In order to achieve the above purpose, the present invention adopts the following technical scheme: the cutting head device for flame cutting comprises a first pipe body, a second pipe body and a third pipe body which are sequentially arranged from inside to outside, wherein the second pipe body is sleeved outside the first pipe body, the third pipe body is sleeved outside the second pipe body, a first gas channel is formed in the first pipe body, a second gas channel is formed between the second pipe body and the first pipe body, a third gas channel is formed between the third pipe body and the second pipe body, and the second gas channel and the third gas channel are all in annular arrangement. According to some preferred embodiments of the present invention, a combustion-supporting gas, such as oxygen, is introduced into the second gas passage, a combustible gas is introduced into the first gas passage, and the gases in the first gas passage and the second gas passage are mixed and ignited to form a flame for flame cutting. The gas in the third gas channel is used for forming an air cavity on the surface of the workpiece to be cut and discharging water in the air cavity during underwater cutting, so that flames in the air cavity can be sustained, and underwater flame cutting is further achieved. According to some preferred embodiments of the invention, the outlet of the third gas channel is directed away from the first tube body and/or the outlet of the second gas channel is directed towards the first tube body. According to some preferred embodiments of the present invention, the cross-sectional area ratio of the first gas channel, the second gas channel, and the third gas channel is 1:2-3:0.6-0.8. According to some preferred implementation aspects of the invention, the gas flow rate at the outlet of the first gas channel is 50-75 m 3/h, the gas flow rate at the outlet of the second gas channel is 100-150 m 3/h, and the gas flow rate at the outlet of the third gas channel is 30-60 m 3/h. According to some preferred embodiments of the present invention, the lower end of the second pipe body has a first portion and a second portion, the first portion being inclined from top to bottom toward the first pipe body, the second portion being inclined from top to bottom toward a direction away from the first pipe body, and/or the lower end of the third pipe body being inclined from top to bottom toward a direction away from the first pipe body. According to some preferred embodiments of the present invention, the angle between the first portion and the vertical surface is 8-12 °, the angle between the second portion and the vertical surface is 12-18 °, and the angle between the lower end of the third tube body and the vertical surface is 12-18 °. According to some preferred embodiments of the invention, the second portion is inclined at the same angle as the lower end of the third tube. According to some preferred embodiments of the invention, the air inlet device comprises a first air inlet pipe and a second air inlet pipe distributed on the periphery of the first air inlet pipe, wherein the extending directions of the first air inlet pipe and the second air inlet pipe are the same, the first air inlet pipe is communicated with a first air channel, and the second air inlet pipe is communicated with a second air channel and a third air channel. According to some preferred embodiments of the present inv