Purging inspection device of continuous casting three-machine three-flow spraying system and purging inspection method

[0024] The technical solution of this patent will be described in further detail below in conjunction with specific embodiments.

[0025] See figure 1 , A continuous casting three-machine three-stream spray system inspection and purge device, including a second cold water main pipeline 4, a nitrogen main pipeline 10, a first-class spray system 11, a second-stream spray system 12, and a three-stream spray system 13; One end of the main pipeline 4 is connected to the second cold water pipe network 1, and the other end is connected to the first-class spray system 11, the second-stream spray system 12 and the third-stream spray system 13 through three second-cold water branch pipelines. The second cold water main pipeline 4 is equipped with The second cold water inlet valve 2, the second cold water pressurizing pump 3, the second cold water filter 5 and the second cold water inlet pressure gauge 6, the second cold water branch pipeline is equipped with the second cold water branch pipeline valve 22, the first-class spray system 11, the second-flow spray There are four sprinkler pipes 14 in the sprinkler system 12 and the three-flow sprinkler system 13. The two cold water branch pipelines are connected with the corresponding four sprinkler pipes 14. The sprinkler pipe 14 is equipped with a pressure gauge 17, an electric regulating valve 19. The electronic flow meter 20 and the spray pipe inlet valve 21. An instrument valve 18 is provided between the pressure gauge 17 and the spray pipe 14; one end of the nitrogen main pipe 10 is connected to the nitrogen pipe network 7, and the other end is passed through a soft metal The pipe 16 is respectively connected to each spray pipe 14. A nitrogen valve 15 is provided at the connection between the metal hose 16 and the spray pipe 14, and the nitrogen main pipe 10 is provided with a nitrogen main valve 8 and a pressure reducing valve 9, and a pressure reducing valve 9 There is a pressure indicator and a filter.

[0026] The working principle of the present invention is: the three-machine three-stream spray system inspection and purge device for the continuous casting, the second cold water in the second cold water pipe network 1 enters the second cold water main pipeline 4, the second cold water pressurizing pump 3 and the second cold water filter 5 Pressurize and filter the secondary cold water separately. The secondary cold water inlet pressure gauge 6 shows the pressure of the pressurized secondary cold water. The secondary cold water in the secondary cold water main pipeline 4 enters the first-class spray system 11 and the second stream through the secondary cold water branch pipeline. The spray system 12 and the spray pipe 14 in the three-flow spray system 13 are used for spraying. The nitrogen in the nitrogen pipe network 7 is fed into the main nitrogen pipe 10 and enters the spray pipes 14 through each metal hose 16. The pressure indicator on the pressure reducing valve 9 is used to indicate the air pressure in the main nitrogen pipe 10.

[0027] The working pressure of the second cold water of continuous casting is 0.9-1.2MPA, the air pressure is 0.5-0.7MPA, the pressure of the nitrogen pipe network 7 is ≥0.8MPA, and the flow rate is ≥1000m3/h; the nitrogen pipe network 7 and the second cold water pipe network are decompressed The valve 9 and the metal hose 16 are connected, and the pressure adjustment range of the pressure reducing valve 9 is 0.1-1MPA; the working pressure of the metal hose 16 is 1-1.6MPA.

[0028] Based on the inspection and purging method of the inspection and purging device of the three-machine and three-stream spray system for continuous casting, the steps are as follows: the first step is to close the second cold water branch pipe valve 22 on each second cold water branch pipe; the second step is to close each spray The spray pipe inlet valve 21 on the shower pipe 14; the third step, close the instrument valve 18 at each pressure gauge 17; the fourth step, open the nitrogen main valve 8; the fifth step, open the metal hose 16 The nitrogen valve 15, the nitrogen in the nitrogen pipe network 7 enters each spray pipe 14 through the nitrogen main pipe 10 and the metal hose 16, and each spray pipe 14 is inspected or purged; the sixth step, the spray pipe 14 inspection or After purging, close the nitrogen valve 15 at each metal hose 16; Step 7, close the nitrogen main valve 8; Step 8, open the instrument valve 18 at each pressure gauge 17; Step 9, open each spray The sprinkler pipe inlet valve 21 on the pipe 14; step ten, the second cold water branch pipe valve 22 on each second cold water branch pipe will be opened again when it is reproduced to prevent the circulating water in the second cold water main pipe 4 from entering the spray Within the lymphatic tube 14.

[0029] After production, the secondary cooling system is purged with nitrogen, which can effectively drain the residual water inside the spray pipe and nozzle. (Because the secondary cooling water mostly uses circulating turbid water to cool the casting slab, this step is very important). It is difficult for medicinal tissues, scale formations and various oxides in the water to stay in the spray system, which greatly reduces the formation of scales, and also effectively reduces the clogging rate of the nozzle.

[0030] When preparing for production again, when the secondary cold water inlet valve is closed, open the nitrogen purge device and keep the pressure between 0.2-0.4mpa, and use gas instead of water to simulate the operation of the sprinkler system with water. At this time, each secondary cooling nozzle can be inspected one by one to simulate the water output situation, and if individual nozzles are found to be clogged, they can be replaced or repaired in time to avoid slab quality accidents and production accidents caused by nozzle clogging.

[0031] Repeating the above two steps can ensure that the service life of the nozzle is increased by 2-3 times than usual; the annual savings of the second cooling nozzle can reach more than 100,000 yuan.

[0032] The inspection and purge device of the three-machine three-stream spray system for continuous casting can promptly drain the secondary cold water out of the secondary cooling pipe network during the production gap of the continuous casting machine, and avoid calcium oxide, iron oxide, and iron oxide in the secondary cold water. Silicon oxide, magnesium oxide, etc. adhere to the spray pipe and the inner wall of the nozzle to produce dirt, which causes the nozzle to have poor water discharge or poor atomization, to ensure that the nozzle has a good atomization environment during continuous casting production, and the second cooling nozzle blockage is greatly reduced. The replacement rate of spare parts has dropped by 80%. The repairable rate of the nozzle has also been greatly improved compared with before, saving more than 100,000 yuan in spare parts expenditure; the three-machine three-stream spray system of the continuous casting machine checks the purge device, and uses nitrogen or air pressure as the medium in an anhydrous state , Complete the inspection of the intact state of the secondary cooling system equipment and facilities, reduce the cost of equipment commissioning, and detect the incomplete condition of the secondary cooling system’s hardware equipment and facilities in an anhydrous state, and prevent pressure relief, water leakage, air leakage and other accidents It is discovered and processed before production; the three-machine three-stream spray system for continuous casting checks the purge device. In winter or when the temperature is low, when the continuous casting production is not continuous, nitrogen or compressed air is used as the purge medium. Complete the purging of the pipe network of the secondary cold water supply and distribution system to avoid equipment damage caused by low temperature.

[0033] The preferred embodiments of this patent are described in detail above, but this patent is not limited to the above-mentioned embodiments, and within the scope of knowledge possessed by those of ordinary skill in the art, it is also possible to make various decisions without departing from the purpose of this patent. Kind of change.