Gas collection and leakage detection device for cooling wall of blast furnace

Abstract

The utility model relates to the technical field of blast furnace smelting equipment, in particular to a blast furnace cooling wall gas collection leak detection device. The device is used for collecting coal gas generated in the cooling wall and judging whether the cooling wall leaks water or not, and is mainly used for checking the cooling wall at the upper part of a furnace body. The device comprises a plurality of cooling wall water pipe groups which are connected in series up and down, cooling wall series water pipes are arranged between the water pipe groups, and a water outlet of the uppermost water pipe group is connected to a water return main pipe. A coal gas collecting device is arranged on a cooling wall series water pipe between every two water pipe groups, and a coal gas collecting device is arranged on a water outlet pipeline of the uppermost water pipe group; and the coal gas collecting device consists of a valve, a gas collecting bag and an exhaust valve which are connected in sequence. By means of the coal gas collecting device and reasonable arrangement, the damaged cooling wall pipe can be checked under the condition that water is not cut off, the structure is simple, the checking process is simple and rapid, the damaged cooling wall pipe in the group of pipes can be accurately found out in the online production process, the segmented pressing process in the overhauling process is omitted, and the overhauling process is greatly shortened.

Description

Technical Field

[0001] The utility model relates to the technical field of blast furnace smelting equipment, namely a blast furnace cooling wall gas collection and leakage detection device, which is used to collect the coal gas generated in the cooling wall, judge whether the cooling wall has water leakage, and is mostly used for checking the cooling wall on the upper part of the furnace. Background Art

[0002] In the prior art, the cooling of modern blast furnaces mostly adopts a combined soft water closed-circuit cooling system. The water supply method of the cooling wall is that each water pipe of the lower cooling wall is connected to the water pipe of the cooling wall above it in sequence until the top cooling wall, and the water outlet is connected to the return water main pipe. The pipe bundles connected in series from bottom to top are called water pipe groups. The cooling wall using the soft water closed-circuit system generally does not produce gas or only produces a very small amount of gas under normal conditions. When the cooling wall is damaged and leaks into the furnace, the inspection basis is usually whether there are water marks on the furnace shell. After finding water marks, it is necessary to first close the lowest water inlet valve and the highest water outlet valve in the water mark area one by one for inspection. At this time, if there is damage, a large amount of coal gas will enter the cooling wall pipe. Determine which group of pipes is damaged by pressure testing or opening the exhaust valve to ignite, and then close the interval valve at the connection of the water pipe group for segmented inspection. If there is no interval valve, it can only be judged based on experience and disconnect the water pipe for pressure testing during maintenance. The workload is large and the means are single, and the accuracy and efficiency are relatively low. It is difficult to achieve accurate inspection during online production, and if the water is stopped for a long time during the inspection process, it will cause certain damage to the cooling wall.

[0003] The traditional online leak detection method for cooling walls can only find out which water pipe group the leak is in. During the troubleshooting process, it is necessary to shut down the valves above and below each group of pipes in the inspection area in turn to stop the water supply. Repeated opening and closing of valves is labor-intensive and cumbersome to operate. In addition, if you want to specifically confirm which pipe on which group the leak is in, you need to disconnect the cooling wall series pipes in the group during maintenance and conduct a segmented pressure test. Only after the leak is found can repairs be carried out or industrial water be passed separately. Utility Model Content

[0004] The purpose of the utility model is to provide a blast furnace cooling wall gas collection and leak detection device with a simple structure and convenient detection in view of the above shortcomings. By collecting the gas in the cooling wall, judging whether the cooling wall is damaged by the gas volume and detecting whether it contains CO, the work efficiency is greatly improved, the troubleshooting time is shortened, and the accurate troubleshooting is strived to be achieved during online production.

[0005] The technical solution of the utility model is: a blast furnace cooling wall gas collection leak detection device, including a plurality of cooling wall water pipe groups connected in series up and down, cooling wall series water pipes between each water pipe group, and the water outlet of the uppermost water pipe group is connected to the return water main pipe, characterized in that a gas collection device is provided on the cooling wall series water pipes between each water pipe group, and a gas collection device is provided on the water outlet pipeline of the uppermost water pipe group; the gas collection device is composed of a valve, a gas collection bag and an exhaust valve connected in sequence.

[0006] The utility model has the advantages that by utilizing the gas collecting device and reasonable settings, the inspection of damaged cooling wall tubes can be carried out without stopping the water supply, the structure is simple, the inspection process is simple and fast, and during online production, it is possible to accurately find out which tube in which group of tubes the damage is located, thus eliminating the process of segmented pressure testing during maintenance, greatly shortening the maintenance process, and making the inspection accurate and convenient.

[0007] The embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a simplified structural diagram of the utility model. DETAILED DESCRIPTION

[0009] See also Figure 1 The names of the parts are as follows: water pipe group 1, cooling wall series water pipe 2, return water main pipe 3, outlet pipe 4, valve 5, air collecting bag 6, exhaust valve 7, furnace shell 8.

[0010] See also Figure 1 , a blast furnace cooling stave gas collection and leak detection device comprises a plurality of cooling stave water pipe groups 1 connected in series up and down, a cooling stave series water pipe 2 is arranged between each water pipe group 1, and the water outlet of the top water pipe group 1 is connected to the return water main 3. A gas collecting device is arranged on the cooling stave series water pipe 2 between each water pipe group 1, and a gas collecting device is arranged on the water outlet pipeline 4 of the top water pipe group; the gas collecting device is composed of a valve 5, a gas collecting bag 6 and an exhaust valve 7 connected in sequence. The gas collecting device is installed on the exhaust pipeline at the top of each group of cooling stave pipes in the water mark area or all groups of pipes are installed permanently. When damage occurs, CO enters the cooling stave pipe through the damaged part, and the gas collecting bag 6 will automatically collect the gas in the pipe. Open the exhaust valves 7 on the gas-collecting bag 6 in the water-marked area one by one, observe the gas volume and detect whether CO is contained in the gas. You can also appropriately reduce the water pressure in the pipe by first adjusting the lowest water inlet valve, and then open the exhaust valve 7 on the gas-collecting bag 6 for observation and detection (depending on the water pressure of the cooling wall). If the gas volume is large and contains CO, it is determined that the group of pipes is damaged. After finding which group of pipes is damaged and leaking, install the exhaust valves on all the connecting pipes of the group of pipes on the gas-collecting device, and you can accurately find out which pipe in which group of pipes is damaged, and then open the exhaust valves 7 on the gas-collecting bag 6 from bottom to top or from top to bottom to check. The damaged cooling wall pipe is between the gas-collecting bag 6 without gas discharge and the gas-collecting bag 6 containing CO gas.

[0011] See also Figure 1The density of gas is much smaller than that of water. When gas and water are mixed, they will move upward quickly. The cooling wall tube water pipe group 1 is connected in series from bottom to top. After damage occurs, the CO gas in the blast furnace will enter the cooling wall water pipe and move upward. Therefore, there is CO gas in the gas collecting device above the damage, but there is no CO gas in the gas collecting device below. Figure 1 There are two gas collecting devices in the middle picture, namely the upper gas collecting device and the lower gas collecting device. If there is CO gas in the upper gas collecting device and there is no CO gas in the lower gas collecting device, or there is CO gas in both the upper gas collecting device and the lower gas collecting device, it can be determined that the water pipe on the upper water pipe group 1 of the cooling wall is broken; if there is no gas in the upper gas collecting device and there is CO gas in the lower gas collecting device, it can be determined that the water pipe on the lower water pipe group 1 of the cooling wall is broken.

[0012] The above description is only a specific implementation of the present utility model, and various examples do not constitute a limitation on the essential content of the present utility model.

Claims

1. A blast furnace cooling stave gas collection leak detection device, comprising a plurality of cooling stave water pipe groups (1) connected in series up and down, a cooling stave series water pipe (2) being provided between each water pipe group (1), a water outlet of the uppermost water pipe group (1) being connected to a return water main pipe (3), characterized in that A gas collecting device is provided on the cooling wall series water pipe (2) between each water pipe group (1), and a gas collecting device is provided on the water outlet pipeline (4) of the top water pipe group; the gas collecting device is composed of a valve (5), a gas collecting bag (6) and an exhaust valve (7) connected in sequence.

Images