CN221945502U - A device for leak detection of blast furnace cross temperature measuring gun - Google Patents

Abstract

The utility model relates to the field of blast furnace smelting, and is a device for leak detection of a cross temperature measuring gun of a blast furnace: a first connecting hose is installed at the water inlet of the cross temperature measuring gun, the other end of the first connecting hose is connected to the water inlet hose, a water inlet ball valve is arranged on the water inlet hose, a water outlet hose is installed at the water outlet of the gun body, the other end of the water outlet hose is connected to the second connecting hose, the other end of the second connecting hose is connected to a tee, a temperature measuring gun water outlet ball valve is arranged on the second connecting hose, one end of the tee is connected to a hard pipe, a pressure gauge is installed at the other end of the hard pipe, the other end of the tee is connected to a third connecting hose, the other end of the third connecting hose is connected to a drain hose, and a drain ball valve is arranged on the drain hose. It can quickly and effectively determine whether there is a cooling medium leakage in the cross temperature measuring gun and then determine its working state, and timely replace the cooling medium of the damaged cross temperature measuring gun from water to nitrogen, thereby reducing the impact on the operation of the blast furnace. The maintenance and replacement cycle can be reasonably arranged according to the condition of the cross temperature measuring gun, the use time can be extended, and the cost can be reduced.

Description

A device for leak detection of blast furnace cross temperature measuring gun

Technical Field

The utility model relates to the field of blast furnace smelting, in particular to a device for leak detection of a blast furnace cross temperature measuring gun.

Background Art

The cross temperature gun of blast furnace is a device for detecting the distribution of gas flow in blast furnace. It is generally composed of four temperature guns inserted radially into the throat of the furnace. The four guns are evenly distributed at 90° intervals. One of the guns is longer, with the longest section located at the center of the throat. The other three are shorter, with the longest end about 0.5m away from the center of the throat. Each of the three short guns is equipped with 5 thermocouples, each thermocouple is 50cm apart. The long gun is equipped with 6 thermocouples, one at the center of the throat, and the distribution of the remaining thermocouples is the same as that of the short gun. There is a cooling pipe inside the temperature gun, which is cooled by high-pressure water.

Since the throat of the furnace where the cross temperature gun is located has to withstand the impact of falling blast furnace charges and the erosion of high-temperature coal gas flow, its temperature also changes dramatically with the charge temperature and gas temperature. It is very easy to wear and crack, resulting in damage to the cooling pipe, and the cooling medium inside it leaks into the furnace, causing the temperature monitored by the thermocouple to be distorted, affecting the operator's analysis and judgment of the furnace condition. When the damage is serious, a large amount of cooling water enters the furnace, causing the furnace temperature to drop sharply, and even causing serious furnace abnormality accidents such as furnace cooling.

The cross temperature gun is located inside the blast furnace, and its damage status cannot be directly judged by naked eyes. It can only be observed by opening the furnace throat manhole during wind stop and maintenance. At present, some manufacturers install flow meters at the inlet and outlet of the cooling pipe of the cross temperature gun to judge whether there is a cooling medium leakage by the difference in cooling water flow. However, two flow meters need to be installed on the same gun, and the data reading error will cause the temperature gun to fail to judge in time when there is a slight leakage.

In order to avoid the impact of the cross temperature gun damage on the blast furnace operation due to the failure to detect it in time, it is urgent to develop a device that can detect and determine the damage of the cross temperature gun in time.

The utility model can quickly and effectively judge whether there is cooling medium leakage in the cross temperature measuring gun and then judge the working state of the cross temperature measuring gun, and timely replace the cooling medium of the damaged cross temperature measuring gun from water to nitrogen, thereby reducing the impact on the operation of the blast furnace.

Utility Model Content

The utility model aims to solve the above problems and provides a device for leak detection of a blast furnace cross temperature measuring gun.

The purpose of the utility model is achieved in this way: a device for leak detection of a cross temperature measuring gun for a blast furnace, comprising a drainage hose, a drainage ball valve, a tee, a pressure gauge, a temperature measuring gun water outlet ball valve, a temperature measuring gun water outlet pipe, a cross temperature measuring gun body, a water inlet hose, a water inlet ball valve, a first connecting hose, a second connecting hose and a third connecting hose, a first connecting hose is installed at the water inlet of the cross temperature measuring gun body, the other end of the first connecting hose is connected to the water inlet hose, a water inlet ball valve is arranged on the water inlet hose, a water outlet hose is installed at the water outlet of the gun body, the other end of the water outlet hose is connected to the second connecting hose, the other end of the second connecting hose is connected to the tee, the second connecting hose is provided with a temperature measuring gun water outlet ball valve, one end of the tee is connected to a hard pipe, a pressure gauge is installed on the other end of the hard pipe, the other end of the tee is connected to the third connecting hose, the other end of the third connecting hose is connected to the drainage hose, and a drainage ball valve is arranged on the drainage hose.

The length of the third connecting hose is 2.0-3.0m.

The beneficial effects of the utility model are as follows: the utility model can quickly determine whether the cooling water pipeline inside the cross temperature measuring gun is damaged or leaking; the detection device used is simple in structure and easy to operate; the connecting hose and ball valve are all common devices in blast furnace production; and the power medium is water, which is easily obtained at the production site.

The 1800m³ blast furnace of Taigang uses this device to detect and determine the damage and leakage of the cross temperature measuring gun many times. According to the condition of the cross temperature measuring gun, the maintenance and replacement cycle is reasonably arranged, and its service life is extended from 2 years to 2.5 years. Calculated based on the cost of 100,000 yuan per gun, the annual cost of use is saved by 40,000 yuan. In addition, by timely checking the leakage of the cross temperature measuring gun, the fuel ratio of the blast furnace is avoided and the furnace condition fluctuates due to the leakage, which also plays a great role in the stable operation of the blast furnace.

BRIEF DESCRIPTION OF THE DRAWINGS

The utility model is further described below in conjunction with the accompanying drawings.

Fig. 1 is a schematic structural diagram of the utility model.

Among them: 1-drain hose, 2-drain ball valve, 3-third connecting hose, 4-tee, 5-pressure gauge, 6-second connecting hose, 7-temperature gun water outlet ball valve, 8-temperature gun water outlet pipe, 9-cross temperature gun body, 10-water inlet hose, 11-water inlet ball valve, 12-first connecting hose, the arrow direction is the cooling water inlet.

DETAILED DESCRIPTION

The basic concept of the utility model is to introduce water with a certain pressure into the cooling water pipeline of the cross temperature measuring gun, and judge the condition of the cooling water pipeline of the cross temperature measuring gun by maintaining the pressure of the water in the pipeline. If the pressure cannot be maintained, it means that there is a leak in the pipeline.

The utility model connects the ball valve and the pressure gauge through a metal hose, and passes pressurized water into the system. The deformation of the metal hose provides a maintainable pressure, and the cross temperature measuring gun body cooling pipe is judged to have damage or leakage according to the change of the pressure indication number. The metal hose connects the ball valve and the pressure gauge, and passes pressurized water into the system. The deformation of the metal hose provides a maintainable pressure, which is a technical feature of the utility model; judging whether the cross temperature measuring gun body cooling pipe is damaged or leaking according to the change of the pressure indication number installed on the system is the second technical feature of the utility model; and exhausting the air in the system first and then closing the drain ball valve during the detection process is the third technical feature of the utility model.

The specific technical solution of the utility model is shown in Figure 1.

First, install the corresponding pipes, valves, and instruments on the cross temperature gun body. The water inlet of the gun body is installed with a water inlet hose 10, a water inlet ball valve 11, and a first connecting hose 12. The water outlet of the gun body is installed with a drain hose 1, a drain ball valve 2, a third connecting hose 3, a tee 4, a pressure gauge 5, a second connecting hose 6, a temperature gun water outlet ball valve 7, and a temperature gun water outlet pipe 8. The maximum range of the pressure gauge 5 is 2.5MPa, and the measuring medium is liquid. All connecting hoses are metal hoses with a pressure resistance level of not less than 2.5MPa. The inner diameter of the metal hose is 50mm (2 inches). All ball valves, tees, metal hoses, and cross temperature gun water inlet and outlet pipe joints are quick connectors with an inner diameter of 50mm (2 inches). The third connecting hose 3 is 2.0~3.0m long and is used to store the pressure of the test water.

Next, close the drain ball valve 2, the temperature gun outlet ball valve 7, and the water inlet ball valve 11, and introduce industrial water at the water inlet hose at a pressure of 1.6MPa. Then open the drain ball valve 2 and the temperature gun outlet ball valve 7 in sequence, and then slowly open the water inlet ball valve 11. When all the air in the entire system is exhausted and there are no bubbles in the water discharged from the drain hose 1, close the drain ball valve 2.

After the pressure gauge 5 shows that the pressure reaches 1.6 MPa and remains stable, the water inlet ball valve 11 is quickly closed. At this time, the pressure in the system is provided by the pressure generated by the compression deformation of the third connecting hose 3.

After closing the water inlet ball valve 11, keep it for 3 minutes. If the pressure reading of the pressure gauge 5 drops, it means that the gun body pipeline is damaged and there is a leak. If the pressure remains stable, it means that the gun body pipeline is not damaged and there is no leak.

After the test is completed, first open the drain ball valve 2 to release the system pressure. When the pressure gauge 5 shows zero, it means that the pressure in the system has been released. Remove all hoses and valves. If the cross temperature gun is damaged or leaking, pass nitrogen to cool it. If there is no leakage, pass industrial water to cool it.

The utility model is used in the 1800m³ blast furnace of Taigang Iron and Steel Plant. Taking the actual production on September 5, 2022 as an example, the specific implementation method is as follows: On September 5, the water worker of the 1800m³ blast furnace during the day shift inspected the gun body in the northeast direction of the cross temperature measuring gun. The corresponding pipes, valves, and instruments are installed on the gun body of the cross temperature measuring gun. The water inlet hose 10, the water inlet ball valve 11, and the first connecting hose 12 are installed at the water inlet of the gun body. The water outlet of the gun body is equipped with a drainage hose 1, a drainage ball valve 2, a third connecting hose 3, a tee 4, a pressure gauge 5, a second connecting hose 6, a temperature measuring gun water outlet ball valve 7, and a temperature measuring gun water outlet pipe 8. The maximum range of the pressure gauge 5 is 2.5MPa, and the measuring medium is liquid. All connecting hoses are metal hoses with a pressure resistance rating of 2.5MPa. The inner diameter of the metal hose is 50mm (2 inches). All ball valves, tees, metal hoses, and cross temperature measuring guns are quick connectors with an inner diameter of 50mm (2 inches) at the inlet and outlet pipe joints. The third connecting hose 3 has a length of not less than 2 m and is used to store the pressure of the test water.

The tee is connected to the pressure gauge through a 30CM metal hard pipe.

Next, close the drain ball valve 2, the temperature gun outlet ball valve 7, and the water inlet ball valve 11, and introduce industrial water at the water inlet hose at a pressure of 1.6MPa. Then open the drain ball valve 2 and the temperature gun outlet ball valve 7 in sequence, and then slowly open the water inlet ball valve 11. When all the air in the entire system is exhausted and there are no bubbles in the water discharged from the drain hose 1, close the drain ball valve 2.

After the pressure gauge 5 shows that the pressure reaches 1.6 MPa and remains stable, the water inlet ball valve 11 is quickly closed. At this time, the pressure in the system is provided by the pressure generated by the compression deformation of the third connecting hose 3.

After closing the water inlet ball valve 11 and keeping it for 3 minutes, the pressure reading of the pressure gauge 5 dropped from 1.6MPa to 1.3MPa, indicating that the gun body pipeline was damaged and there was leakage.

After the measuring device was removed, nitrogen was introduced into the gun body for cooling. Due to the timely detection, the operation of the blast furnace was not affected.

The utility model was used in the 1800m³ blast furnace of Taigang. The damage and leakage of the cross temperature measuring gun were detected many times. The maintenance and replacement cycle was reasonably arranged according to the condition of the cross temperature measuring gun. Its service life was extended from 2 years to 2.5 years. Based on the cost of 100,000 yuan per gun, the annual cost of use was saved by 40,000 yuan. In addition, by timely checking the leakage of the cross temperature measuring gun, the fuel ratio of the blast furnace was avoided and the furnace condition fluctuated due to the leakage, which also played a great role in the stable operation of the blast furnace.

The above description is only a specific embodiment of the present invention, but the structural features of the protection scope of the present invention are not limited thereto. Any changes or modifications made by any technician in the field of the present invention are included in the patent scope of the present invention.

Claims (2)

1. The utility model provides a device of blast furnace cross temperature measurement rifle leak hunting which characterized in that: including drainage hose, drainage ball valve, tee bend, the manometer, temperature measuring rifle goes out water ball valve, temperature measuring rifle outlet pipe, cross temperature measuring rifle body, the hose that intakes, the ball valve that intakes, first coupling hose, second coupling hose and third coupling hose, cross temperature measuring rifle body water inlet department installs first coupling hose, the hose that intakes is connected to the first coupling hose other end, be provided with the ball valve that intakes on the hose that intakes, rifle body delivery port department installs out water hose, the second coupling hose is connected to the water hose other end, the tee bend is connected to the second coupling hose other end, be provided with temperature measuring rifle play water ball valve on the second coupling hose, hard tube is connected to tee bend one end, the manometer is installed to the hard tube other end, the third coupling hose is connected to the tee bend other end, the drainage hose is connected to the third coupling hose other end, be provided with the drainage ball valve on the drainage hose.

2. The device for detecting leakage of a cross-shaped temperature measuring gun of a blast furnace according to claim 1, wherein the device comprises: the length of the third connecting hose is 2.0-3.0m.