Blast furnace cooling wall water channel leakage on-line detection device

Abstract

The utility model discloses a blast furnace cooling wall water channel leakage on-line detection device, and relates to the technical field of blast furnace water leakage detection. The blast furnace cooling wall water channel leakage on-line detection device comprises a cooling wall pipe penetrating through a furnace shell, a sampling device is connected to the cooling wall external connection pipe exposed outside the furnace shell, the sampling device is communicated with a sampling tank through a pipeline, the sampling tank is communicated with a water tank, and a gas recovery airbag is connected to the sampling tank; the total number of the cooling wall external connection pipes is multiple layers, and each layer of cooling wall external connection pipe is provided with one sampling device, or each layer of cooling wall external connection pipe is provided with one sampling device in a determined area prone to leakage according to working conditions. The detection device provided by the utility model can detect the damage of the water channel of the cooling wall of a specific layer without stopping production, and is convenient and fast; the cooling wall of the layer is isolated on line and is changed into independent water supply cooling, and the adjacent upper and lower layers of cooling walls are connected in a jumping manner to recover original system cooling; the blast furnace can be completed without stopping production, production stopping and damping down of the blast furnace are reduced, and production loss is greatly reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to blast furnace water leakage detection technical field especially relates to a blast furnace cooling wall water channel leak online detection device. BACKGROUND

[0002] When reaching the middle and later period of the use of blast furnace cooling wall, the internal water channel of the cooling wall is prone to leakage, since each water channel of the cooling wall is composed of multiple layers in series from the bottom layer water inlet to the top layer water outlet, once leakage occurs, it is impossible to determine which layer of the cooling wall has the problem, and the blast furnace can only be stopped for production and then segmented for pressure screening to find the leakage point, resulting in too long production stoppage and repair time, leading to unstable, smooth and high production of the blast furnace, and directly affecting the production index.

[0003] The Chinese patent with publication number CN203833957U discloses an online water temperature monitoring device, which is necessary for monitoring the water temperature of the cooling wall during the blast furnace smelting process, and the blast furnace smelting is sensitive to water temperature control, mainly to measure the temperature difference between the temperature before the cooling water enters the cooling wall and the outlet water temperature of the cooling wall to determine whether the cooling wall is good, once the temperature difference rapidly rises, there will be a risk of furnace shell burning through, and the smelting must be stopped immediately; in the past, the temperature was measured by manually opening the blowdown valve and draining water with a thermometer, and the cooling wall water channel leakage problem cannot be monitored.

[0004] The Chinese patent with publication number CN2517747Y discloses that the temperature difference of the inlet and outlet water is monitored by instruments and meters to determine whether there is a problem, and then to determine that the water pipe of a certain string of cooling walls has a problem, that is, it can be determined that a certain large series of water pipes has a problem, but it cannot determine which layer of the water channel has a problem, for example, the water inlet temperature of a certain layer of water channel is 25 degrees Celsius, and the outlet temperature is also 25 degrees Celsius, the temperature difference is 0, and under normal conditions without controlling water pressure, the water pressure is greater than the pressure in the furnace, so the water in the water channel leaks into the furnace, and therefore the temperature difference does not change.

[0005] The technical solution disclosed by the Chinese patent with publication number CN201648424U further optimizes the electronic temperature measurement and water quality measurement device, only reducing the cost of the temperature measurement device.

[0006] The Chinese patent with publication number CN206127341U discloses a system composed of instruments and meters and computer software, which has great difficulty in field construction and is too expensive, and the instruments and meters and cables are easily damaged in the high-temperature alarm environment, which affects the production efficiency when replaced. UTILITY MODEL CONTENTS

[0007] The utility model aims to provide an online troubleshooting device, which can detect the specific leakage layer of the blast furnace cooling wall water channel without stopping production.

[0008] In order to realize the technical purpose, the utility model discloses the following scheme: blast furnace cooling wall water channel leakage on-line detection device, including the cooling wall pipe of through furnace skin, the cooling wall outer connection pipe of exposing at the outside of furnace skin is connected with sampling device, sampling device is communicated with sampling tank through pipeline, sampling tank is communicated with water tank, and sampling tank is connected with the gas bag of coal gas recovery on, the total number of cooling wall outer connection pipe is several layers, and every layer cooling wall outer connection pipe installs a sampling device, or according to the working condition, determines the area of easy leakage in, and every layer cooling wall outer connection pipe installs a sampling device.

[0009] Compared with the prior art, the utility model has the beneficial effects that: the detection device provided by the utility model collects the coal gas in the furnace in a layer, can judge that all layers of cooling wall outer connection pipe below the collection layer are the leakage cooling wall area, and according to the leakage principle below, one by one, without stopping production, can detect which layer of cooling wall water channel is damaged, convenient and fast, on-line isolation of this layer of cooling wall is changed into single water supply cooling, and the adjacent upper and lower two layers of cooling wall are connected to restore the original system cooling, the blast furnace can be completed without stopping production, reduces the blast furnace production, and greatly reduces the production loss.

[0010] Further, the cooling wall outer connection pipe is arranged in a U-shaped structure, and the sampling device is connected to the high-position pipe of the U-shaped structure.

[0011] Further, the sampling device includes a first valve, a sealing base, a sealing screw cap and a sampling pipe, the lower end of the first valve is connected to the cooling wall outer connection pipe, the upper end of the first valve is connected to the sealing base, the sealing screw cap is threadedly connected to the sealing base, and the lower end of the sampling pipe is inserted into the sealing screw cap and the sealing base.

[0012] Further, the interface positions of the sealing screw cap and the sealing base are provided with sealing rings.

[0013] Further, the connecting pipeline between the sampling device and the sampling tank is provided with a second valve and a third valve, the second valve is adjacent to the sampling device and is used for controlling the on-off of the mixed gas water delivery pipeline, and the third valve is adjacent to the sampling tank and is used for controlling whether the gas and water enter the sampling tank.

[0014] Further, an automatic exhaust valve is installed between the coal gas recovery gas bag and the sampling tank and is used for exhausting the coal gas in the sampling tank into the coal gas recovery gas bag.

[0015] Further, the sampling tank is provided with an inverted L-shaped water outlet pipe, and the lower end of the water outlet pipe is located at the half of the volume height of the lower cylindrical end of the sampling tank.

[0016] Further, the horizontal pipe of the water outlet pipe extends to the outside of the sampling tank and is provided with a water outlet valve, and the water outlet valve is communicated with the water tank through a pipeline. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 A structure schematic diagram of the online monitoring device for the water channel leakage of the cooling wall of the blast furnace is provided for the embodiment of the utility model.

[0018] Figure 2 A structure schematic diagram of the sampling device is provided for the embodiment of the utility model.

[0019] Figure 3 A cooling wall outer connecting pipe schematic diagram is provided for the embodiment of the utility model.

[0020] Figure 4 A cooling wall connecting structure schematic diagram is provided for the embodiment of the utility model.

[0021] Figure 5 A structure schematic diagram of the sampling tank is provided for the embodiment of the utility model.

[0022] Marked as: 1, furnace skin; 2, cooling wall outer connecting pipe; 201, high-level pipe; 3, pipe short section; 4, first valve; 5, sampling device; 6, sampling pipe; 7, second valve; 8, second hose; 9, third valve; 10, gas recovery air bag; 11, automatic exhaust valve; 12, sampling tank; 1201, water outlet pipe; 13, water outlet valve; 14, first hose; 15, water tank; 16, water supply ring pipe; 17, water inlet master valve; 18, first layer cooling wall; 19, second layer cooling wall; 20, intermediate layer cooling wall; 21, top layer cooling wall; 22, water outlet master valve; 23, cooling wall inner connecting pipe; 24, water outlet ring pipe; 25, sealing base; 26, sealing screw cap. DETAILED DESCRIPTION

[0023] In order to fully understand the purpose, features and effects of the utility model, the following specific embodiments are used to make a detailed description of the utility model, but the utility model is not limited to this.

[0024] The terms "first", "second", "third" are only used for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second", "third" can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "several layers" is two or more than two, unless otherwise specifically limited.

[0025] Please refer to Figures 1 to 5The utility model provides a kind of blast furnace cooling wall water channel leakage on-line monitoring device, including cooling wall inner, outer connecting pipe, sampling device 5, sampling tank 12 and water tank 15, multiple cooling wall outer connecting pipe 2 is installed in furnace skin 1 outside and is arranged in up and down arrangement, upper and lower adjacent cooling wall outer connecting pipe 2 is connected by cooling wall inner connecting pipe 23 placed in furnace skin 1 inside, constitutes a whole cooling water circuit.Sampling device 5 is connected with cooling wall outer connecting pipe 2, sampling device 5 is connected with sampling tank 12, sampling tank 12 upper port is connected with coal gas recovery air bag 10 by pipeline, the outlet of sampling tank 12 is connected with water tank 15.The total number of cooling wall outer connecting pipe 2 is several layers, and each layer of cooling wall outer connecting pipe is equipped with a sampling device 5, sampling tank 12, water tank 15 and other monitoring devices, or according to the use condition screening partial cooling wall outer connecting pipe area prone to leakage, and a sampling device 5, sampling tank 12, water tank 15 and other monitoring devices are respectively installed on each layer of cooling wall outer connecting pipe in the area.

[0026] In some preferred embodiments, as shown in Figure 2 Sampling device 5 includes first valve 4, sealing base 25, sealing screw cap 26 and sampling pipe 6, first valve 4 is communicated with cooling wall outer connecting pipe 2 by pipeline short section 3 (can be welded short section etc.); the upper end of first valve 4 is threadedly connected with sealing base 25, the upper end of sealing base 25 is connected with sealing screw cap 26, sampling pipe 6 lower end is inserted in the center hole of sealing screw cap 26, and sealing ring is installed at the interface position of sealing screw cap 26 and sealing base 25, preferably polytetrafluoroethylene sealing ring.The other end of sampling pipe 6 is communicated with sampling tank 12 by second hose, wherein second valve 7 is installed on the upper end of sampling pipe 6, and third valve 9 is installed at the end of sampling tank 12 inlet.

[0027] Further, automatic exhaust valve 11 is installed on the pipeline connecting sampling tank 12 upper end and coal gas recovery air bag 10.

[0028] Further, water outlet valve 13 is installed at the outlet side of sampling tank 12, and water outlet valve 13 is connected with water tank 15 by first hose 14.More preferably, inverted L-shaped water outlet pipe 1201 is installed inside sampling tank 12, and water outlet valve 13 is installed at the part of water outlet pipe 1201 exposed outside sampling tank, because of gas-water separation, the upper part of sampling tank is gas, and the lower part is water, so the bottom end of water outlet pipe 1201 is located at one half of the lower part of sampling tank 12, as shown in Figure 5 Preferably, the tank body is cylindrical, and the pressure bearing effect is better.

[0029] In some more preferred embodiments, cooling wall outer connecting pipe 2 is arranged in inclined U-shaped structure, as shown in Figure 3As shown, the external cooling wall pipe 2 connects to the internal cooling wall pipes 23 of the upper and lower adjacent cooling walls, forming a connected serpentine cooling wall pipe structure. The sampling device 5 is mounted on the horizontally inclined U-shaped high-level pipe 201.

[0030] The method for using the online monitoring device for leakage in the blast furnace cooling wall water channels includes the following steps:

[0031] S1. Pressurized mounting holes are made on the high-level pipe 201 of each cooling wall external connection pipe 2 (or on each cooling wall external connection pipe in key leak-prone areas).

[0032] S2. Install the sampling device 5 on the mounting hole of S1.

[0033] S3. Control the pressure in the cooling water channel (here, the cooling water channel refers to the cooling wall external connecting pipe 2 and the cooling wall internal connecting pipe 23 together) to be lower than the pressure in the blast furnace, so that the gas in the blast furnace leaks out from the cooling water channel in a slow manner.

[0034] like Figure 4 As shown, the main inlet end of the cooling wall external connecting pipe is connected to a water supply ring pipe 16, and the end of the cooling wall external connecting pipe connected to the water supply ring pipe is equipped with a main inlet valve 17. The main outlet end of the cooling wall external connecting pipe is connected to a water outlet ring pipe 24, and the end of the cooling wall external connecting pipe connected to the water outlet ring pipe 24 is equipped with a main outlet valve 22. The cooling walls are named sequentially from bottom to top as the first layer cooling wall 18, the second layer cooling wall 19, the intermediate layer cooling wall 20, and the top layer cooling wall 21. The intermediate layer cooling wall 20 can represent or be extended to any intermediate layer that is not the top layer, not the first layer, and not the second layer. For example, if there are a total of eighteen layers, then the top layer cooling wall 21 is the eighteenth layer, and the intermediate layer cooling wall 20 can be considered as any layer from the third layer to the seventeenth layer.

[0035] To control the pressure in the cooling water channels to be lower than the pressure inside the blast furnace, the specific method is to control the pressure in the cooling water channels, and the operating steps are as follows:

[0036] S3-1. Manually adjust the position of the main inlet valve 17;

[0037] S3-2. Close the main outlet valve 22 and use the automatic air vent valve 11 (preferably DN32) to direct the water to flow out of the water tank 15;

[0038] S3-3. Change the closed-loop water circulation system to an open-loop water system;

[0039] S3-4. A pressure gauge on the sampling device 5 can be read to show the real-time pressure. Adjust the pressure of the sampling device 5 to 0.2~0.25MPa. The pressure inside the furnace is usually 0.3~0.4MPa (the pressure inside the blast furnace can be directly obtained from the operating system provided by the blast furnace supplier).

[0040] S3-5. Only when the pressure inside the blast furnace is greater than the pressure of the external connecting pipe of the cooling wall where the sampling device is located can the blast furnace gas leak into the sampling device.

[0041] S4. The gas and water leaking from the blast furnace are collected together in the sampling tank 12 by the sampling device 5 (the collection and sampling time is about 10 to 15 minutes). The leaked gas is discharged into the gas recovery bag 10 through the automatic exhaust valve 11 of the sampling tank 12, and the water is discharged into the water tank 15.

[0042] S5. When a sampling tank in a certain layer collects gas from the furnace, it can be determined that the external connecting pipes of all cooling walls below that collection layer are leaking cooling walls.

[0043] S6. According to S5, close the first valve 4 of each sampling device below the collection layer one by one to finally confirm the specific leakage layer.

[0044] For example: Install a sampling device on the external connecting pipe of each cooling wall: If the leak is detected on the fifteenth layer of the middle cooling wall 20, then the leaking layer should be one of the layers below the fifteenth layer. However, to determine which layer it is, it is necessary to shut down other layers one by one and then conduct further testing.

[0045] Compared with the technical solution disclosed in announcement number CN2517747Y, this utility model can detect which specific cooling wall is leaking. It adopts a physical detection method to directly see the gas leaking out of the furnace. The gas collection and recovery process is simple, low-cost, and safe to operate.

[0046] Finally, it should be noted that the above-listed embodiments are merely preferred embodiments of the present invention. Of course, those skilled in the art can make modifications and variations to the present invention. If such modifications and variations fall within the scope of the claims of the present invention and their equivalents, they should be considered as being within the protection scope of the present invention.

Claims

1. An on-line detection device for detecting a water channel leakage in a blast furnace cooling stave, comprising a cooling stave pipe through a furnace skin; characterized in that, The sampling device is connected to the outer connecting pipe of the cooling wall outside the furnace shell, and is communicated with a sampling tank through a pipeline, the sampling tank is communicated with a water tank, and a coal gas recovery air bag is connected to the sampling tank. The total number of the outer connecting pipes of the cooling wall is several layers, and one sampling device is installed in each layer of the outer connecting pipes of the cooling wall, or one sampling device is installed in each layer of the outer connecting pipes of the cooling wall according to the working condition of the region where leakage is prone to occur.

2. The on-line detection device for detecting a water channel leakage of a cooling stave of a blast furnace according to claim 1, characterized by, The outer connecting pipe of the cooling wall is in a U-shaped structure arranged obliquely, and the sampling device is connected to the high-position pipe of the U-shaped structure of the outer connecting pipe of the cooling wall.

3. The on-line detection device for detecting a water channel leakage of a cooling stave of a blast furnace according to claim 1, characterized by, The sampling device comprises a first valve, a sealing base, a sealing screw cap and a sampling pipe, the lower end of the first valve is connected to the outer connecting pipe of the cooling wall, the upper end of the first valve is connected to the sealing base, the sealing screw cap is threadedly connected to the sealing base, and the lower end of the sampling pipe is inserted into the sealing screw cap and the sealing base.

4. The on-line detection device for detecting a water channel leakage of a cooling stave of a blast furnace according to claim 3, characterized by, A sealing ring is arranged at the joint position of the sealing screw cap and the sealing base.

5. The on-line detection device for detecting a water channel leakage of a cooling stave of a blast furnace according to claim 1, characterized by, Second and third valves are arranged on the connecting pipeline between the sampling device and the sampling tank, the second valve is arranged close to the sampling device and is used for controlling the on-off of the mixed gas and water pipeline, and the third valve is arranged close to the sampling tank and is used for controlling whether the gas and water enter the sampling tank.

6. The on-line detection device for detecting a water channel leakage of a cooling stave of a blast furnace according to claim 1, characterized by, An automatic exhaust valve is arranged between the sampling tank and the coal gas recovery air bag, and is used for discharging the coal gas in the sampling tank to the coal gas recovery air bag.

7. The on-line detection device for detecting a water channel leakage of a cooling stave of a blast furnace according to claim 1, characterized by, An inverted L-shaped water outlet pipe is arranged in the sampling tank, and the lower end of the water outlet pipe is located at the position of one-half of the volume height of the lower cylindrical end of the sampling tank.

8. The on-line detection device for detecting a water channel leakage of a cooling stave of a blast furnace according to claim 7, characterized by, The outer end of the horizontal pipe of the water outlet pipe extends to the outside of the sampling tank, and a water outlet valve is arranged on the outer end, and the water outlet valve is communicated with the water tank through a pipeline.

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