CN110527770A - A method for detecting the high temperature thermal state inside a hot blast furnace in a non-suspended state of a blast furnace - Google Patents

Abstract

The present invention relates to the hot detection methods of hot-blast stove internal high temperature under a kind of non-Status of hugh wind of blast furnace, its detecting step is: the first step, hot-blast stove need to be detected and be transferred to cold stoking state, check and confirm that hot-blast valve, cold blast sliding valve, gas-fired valve, gas stop valve, gas regulator, combustion-supporting combustion air stop valve, combustion-supporting combustion air regulating valve, nitrogen purge valve, the ram valve of the furnace are completely in closed state and close each valve oil cylinder shut-off valve；Second step after opening the purge valve of effective partition hot-blast stove, two chimney valves, carries out exhausting to hot-blast stove body interior using hot-blast stove chimney, forms micro-vacuum state in hot wind furnace body；Third step, opening need to detect hot-blast stove detection position manhole or other holes, and confirmation hot-blast stove body interior has formed micro-vacuum state, and safely controllable, then high temperature endoscope is protruded into inside hot-blast stove and is detected.

Description

A method for detecting the high temperature thermal state inside a hot blast furnace in a non-suspended state of a blast furnace

technical field

The invention belongs to the technical field of temperature detection technology, and relates to a method for detecting a high temperature thermal state inside a hot blast stove in a non-stop blast state of a blast furnace.

Background technique

The basic conditions for the high-temperature thermal state detection inside the hot blast stove body are: the inside of the hot blast stove body is in a state of slight negative pressure to ensure the safety of the operation; the inside of the hot blast stove body has no obvious interference to ensure the detection image is clear. Therefore, the conventional high-temperature thermal state detection inside the blast furnace hot blast stove is selected to be carried out when the blast furnace air is off and the hot blast stove system is completely stopped, and the combustion-supporting air, gas, nitrogen, etc. that may enter the hot blast stove body will be shut down or cut off. Air source, open a flue valve and communicate with the chimney to form a slightly negative pressure state, and then open the detection manhole, and then extend the high-temperature endoscope into the hot blast stove for detection.

However, sometimes when the blast furnace is in the non-stop state, due to abnormal changes in the operating state of the hot blast furnace equipment, it is urgent to perform high temperature thermal state detection on a single or all hot blast furnaces in a blast furnace. The technology that can only be carried out under wind conditions cannot meet the needs of current production. In order to detect the high temperature thermal state of the hot blast stove in time, if you choose to shut down the blast furnace, it will directly affect the blast furnace production; if the blast furnace is continuously blasted, it may delay the timely detection required by the hot blast stove, which in turn will affect the blast stove Equipment life, blast furnace air temperature, etc.

SUMMARY OF THE INVENTION

one. In order to overcome the above shortcomings of the prior art, the present invention provides a method for detecting a high temperature thermal state inside a hot blast stove in a non-stop state of the blast furnace, which utilizes the existing valve of the hot blast stove to effectively isolate the required detection hot blast stove from the overall system of the hot blast stove. , and then use the chimney Unicom to detect the hot blast stove body for air extraction, and form a micro-negative pressure state inside the hot blast stove body to meet the high temperature thermal state detection requirements inside the hot blast stove.

The technical scheme adopted by the present invention to solve the technical problem is: a method for detecting a high temperature thermal state inside a hot blast stove under a non-stop blast state of a blast furnace, and the detecting steps are:

The first step is to turn the hot blast stove to be tested into a stuffy state, check and confirm the hot blast valve, cold blast valve, gas combustion valve, gas cut-off valve, gas control valve, combustion-supporting combustion air cut-off valve, combustion-supporting combustion air regulating valve, The nitrogen purge valve, stamping valve, etc. are all closed, and the cylinder shut-off valve of each valve is closed, so that the air supply system of the tested hot blast stove and the original hot blast stove, blast furnace cold air, hot air, combustion air, gas, nitrogen, etc. The air source has been effectively cut off;

The second step is to open the pressure relief valve and the two flue valves that effectively cut off the hot blast stove, and then communicate with the chimney, and then use the hot blast stove chimney to exhaust the inside of the hot blast stove body, forming a slight negative pressure state in the hot blast stove body , it can meet the conditions required for testing;

The third step is to open the manhole or other holes in the detection part of the hot blast stove to be tested, and confirm that a micro-negative pressure state has been formed inside the hot blast stove body, which is safe and controllable, and then the high-temperature endoscope is inserted into the hot blast stove for detection; the detection is completed. After that, restore the manhole or other holes in the detection part to the original state, confirm that the sealing is good, and then restore the stop valve of each valve cylinder to the original state.

In the third step of the detection process, if there is a gas monitoring alarm, the other hot blast stove that is in a burning state should be immediately stopped and turned into a smoldering furnace state to eliminate potential safety hazards.

In the third step, in order to reduce the influence of thermal state detection on the reduction of blast furnace air temperature, the hot blast furnaces to be detected can be performed one by one, or at intervals of detection-air supply-burning furnace-detection cycle.

The operation in the third step involves high temperature, and labor protection equipment should be worn before operation to prevent burns.

In the first and second steps, because the hot blast stoves and valves are in different process states, they must be commanded and confirmed in a unified manner to prevent misoperation.

The positive effects of the present invention are: the high temperature thermal state detection inside the hot blast furnace can be realized in the non-wind off state of the blast furnace, and other equipment investment is not required to be increased; The impact of blast furnace production also meets the urgent need for testing of hot blast furnace equipment.

Description of drawings

Figure 1 is a schematic diagram of the structure of a hot blast stove.

In the picture: 1- Hot air valve, 2- Cold air valve, 3- Air regulating valve, 4- Air shut-off valve, 5- Gas regulating valve, 6- Gas shut-off valve, 7- Gas burning valve, 8- Nitrogen purge valve, 9- flue valve one, 10- charging valve, 11- flue valve two, 12- exhaust valve, 13- chimney, 14- flue pipe.

Detailed ways

The present invention will be further described below with reference to the accompanying drawings and embodiments.

Referring to Fig. 1, a method for detecting the high temperature thermal state inside a hot blast stove in a non-stop state of blast furnace, the steps are as follows:

The first step is to turn the hot blast stove to be tested into a stuffy state, check and confirm the hot blast valve 1, cold blast valve 2, gas combustion valve 7, gas shut-off valve 6, gas regulating valve 5, air shut-off valve 4, and air conditioning of the furnace. Valve 3, nitrogen purging valve 8, stamping valve 10, etc. are all in a closed state, and the cylinder shut-off valve of each valve is closed. In this way, the air supply system of the tested hot blast stove and the original hot blast stove, and the blast furnace cold air, hot air, combustion air, gas, nitrogen and other gas sources in the furnace system are effectively isolated.

Since it is necessary to open the relevant detection holes during the detection process, it will cause heat loss, and the hot blast stove has a high temperature requirement for the dome temperature.

The second step is to open the 12, flue valve one 9, and flue valve two 11 that effectively isolate the hot blast stove, that is, to communicate with the chimney, and use the hot blast stove chimney 13 to exhaust the inside of the hot blast stove body through the flue pipe 14. A micro-negative pressure state is formed in the furnace body, which can meet the requirements of the detection conditions. Depending on the size of the drawing force of the chimney 13 of the hot blast stove, usually open the pressure relief valve 12 and the flue valve 1 9 first, and then open the flue valve 2 11 according to the situation. The detection hole does not emit gas, the operation is safe, the detection image is clear, and the effect is good.

The third step is to open the manhole or other holes in the detection part of the hot blast stove, confirm that the inside of the hot blast stove body has formed a micro-negative pressure state, and it is safe and controllable, and then insert the high temperature endoscope into the hot blast stove for detection. After the test is completed, restore the manhole or other holes in the test site to the original state to confirm that the seal is good. Then restore the shut-off valve of each valve cylinder to its original state.

During the detection, if there is a gas monitoring alarm, the other hot blast stove that is in the burning state should be immediately stopped and turned into the smoldering furnace state to eliminate potential safety hazards.

In order to reduce the influence of the thermal state detection on the reduction of blast furnace air temperature, the hot blast furnaces to be tested can be carried out one by one, or at the interval of detection-air supply-burning furnace-detection.

The operation in the third step involves high temperature, and labor protection equipment should be worn before operation to prevent burns.

In the first and second steps, because the hot blast stoves and valves are in different process states, they must be commanded and confirmed in a unified manner to prevent misoperation.

The invention can be popularized and applied to different types ^of large, medium and small blast furnaces in the same industry to carry out high temperature thermal state detection inside the blast furnace hot blast furnace under production conditions. , External combustion hot blast stove application. The technology can realize the detection of the high temperature thermal state inside the hot blast furnace under the non-stop air state of the blast furnace, and does not need to increase the investment of other equipment. Compared with the conventional high-temperature thermal state detection in the off-air state, the impact on blast furnace production is reduced, and the urgently needed detection of hot blast furnace equipment is met. It is very flexible and does not cause any harm to the hot blast furnace body equipment.

Claims (5)

1. a method for detecting a high temperature thermal state inside a hot blast stove under a non-stop wind state of a blast furnace, it is characterized in that the detection step is: The first step is to turn the hot blast stove to be tested into a stuffy state, check and confirm the hot blast valve, cold blast valve, gas combustion valve, gas cut-off valve, gas control valve, combustion-supporting combustion air cut-off valve, combustion-supporting combustion air regulating valve, The nitrogen purge valve and stamping valve are all closed, and the cylinder shut-off valve of each valve is closed, so that the air supply system of the tested hot blast stove and the original hot blast stove, blast furnace cold air, hot air, combustion-supporting air, gas, nitrogen and other gases in the furnace system The source has been effectively cut off; The second step is to open the pressure relief valve and the two flue valves that effectively cut off the hot blast stove, and then communicate with the chimney, and then use the hot blast stove chimney to exhaust the inside of the hot blast stove body, forming a slight negative pressure state in the hot blast stove body , it can meet the requirements of the testing conditions; The third step is to open the manhole or other holes in the detection part of the hot blast stove to be tested, and confirm that a micro-negative pressure state has been formed inside the hot blast stove body, which is safe and controllable, and then the high-temperature endoscope is inserted into the hot blast stove for detection; the detection is completed. After that, restore the manhole or other holes in the detection part to the original state, confirm that the sealing is good, and then restore the stop valve of each valve cylinder to the original state. 2. the method for detecting the high temperature thermal state inside the hot blast stove under the non-winding state of blast furnace as claimed in claim 1, is characterized in that: in the 3rd step detection process, if there is a gas monitoring alarm situation, it should be in the state of combustion The other hot blast stove immediately stopped burning and turned into a smoldering furnace state to eliminate potential safety hazards. 3. the method for detecting the high temperature thermal state inside the hot blast furnace under the non-winding state of blast furnace as claimed in claim 1, it is characterized in that: in the described 3rd step, for reducing the impact of the thermal state detection on blast furnace air temperature reduction, to the required The detection of hot blast stoves can be carried out one by one, or at intervals of detection-air supply-burning furnace-detection cycle. 4. The method for detecting the high temperature thermal state inside the hot blast furnace under the non-off-air state of the blast furnace as claimed in claim 1, wherein the operation involves high temperature in the third step, and labor protection articles should be worn before the operation to prevent burns. 5. the method for detecting the high temperature thermal state inside the hot blast stove under the non-winding state of blast furnace as claimed in claim 1, it is characterized in that: in the described first and second steps, because each hot blast stove and valve are under different process conditions, must be unified Command, confirm, and prevent misoperation.