Method for measuring and adjusting heat flow intensity of blast furnace

Abstract

The invention discloses a method for measuring and adjusting heat flow intensity of a blast furnace. The method comprises the following steps: (1) monitoring to obtain inlet temperature Tin of a blast furnace cooling wall, outlet temperature Tout of the blast furnace cooling wall and flow velocity V of cooling water in a water outlet pipe of the blast furnace cooling wall; (2) utilizing the inlet temperature T < inlet >, the outlet temperature T < outlet > and the cooling water flow velocity V, and calculating through a formula to obtain the actual measurement of the heat flow intensity J of the blast furnace cooling wall; (3) comparing the calculated heat flow intensity J actual measurement of the blast furnace cooling wall with a heat flow intensity control standard J standard, and if the heat flow intensity J actual measurement of the blast furnace cooling wall is in a normal value range, continuing to keep; and if the blast furnace cooling wall heat flow intensity J actually exceeds the normal value range, adjusting the blast furnace cooling wall heat flow intensity J and returning the blast furnace cooling wall heat flow intensity J to the normal value range. The method can accurately judge the heat flow distribution condition in the blast furnace and the change of the cooling intensity of each part, provides effective operation guidance for blast furnace operators, and prolongs the service life of the blast furnace.

Description

Technical Field

[0001] The invention relates to the technical field of blast furnaces, and in particular to a method for measuring and adjusting the heat flux intensity of a blast furnace. Background Art

[0002] Modern blast furnaces require high efficiency, automation, continuity and longevity, especially longevity, which has become one of the important goals pursued by the ironmaking industry. The heat flux intensity of the blast furnace cooling wall refers to the amount of heat transferred per unit area on the inner side of the cooling wall. It is one of the important indicators of the performance of the blast furnace cooling system and is of great significance for the safe and stable operation of the blast furnace. The greater the heat flux intensity, the more heat is transferred per unit area on the inner side of the cooling wall, and the better the cooling effect. However, excessive heat flux intensity may also cause the cooling wall to bear excessive heat load, thereby affecting the stable operation of the blast furnace. Therefore, by monitoring the heat flux intensity of the blast furnace cooling wall, we can understand the thermal state inside the blast furnace and provide an important basis for blast furnace operation. For example, when the heat flux intensity increases abnormally, it may indicate that there are problems such as excessive thermal stress and severe wear of the lining inside the blast furnace, and timely measures need to be taken to adjust.

[0003] However, at present, iron and steel plants only rely on thermocouples for temperature detection, which is not conducive to judging the heat loss of blast furnaces. Moreover, for the detection of heat flux intensity of blast furnace cooling walls, it is generally based on the water-watching team to manually use thermocouples to measure the inlet and outlet water temperature difference of the cooling wall, and then rely on the manual reconnection of water pipes to divert the flow to fill a fixed volume container, and use a stopwatch to time the time it takes to fill the fixed volume container with water, and then calculate the water temperature difference and water flow rate, thereby deriving the heat flux intensity of the blast furnace cooling wall. The above-mentioned manual measurement method has various disadvantages, is time-consuming and labor-intensive, cannot be monitored in real time, and has large errors, and cannot provide accurate and timely data support for the maintenance and longevity of the blast furnace; in addition, the current blast furnace operators mostly rely on experience to adjust the heat flux intensity of the blast furnace cooling wall, and there is no fixed adjustment basis and standard, which undoubtedly brings huge hidden dangers to blast furnace safety. Therefore, the above problems need to be solved urgently. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a method for measuring and adjusting the heat flux intensity of a blast furnace, which can accurately judge the heat flux distribution inside the blast furnace and the changes in the cooling intensity of various parts of the blast furnace, and provide effective operation guidance for blast furnace operators, which is beneficial for blast furnace operators to control the heat flux intensity to assist the blast furnace in safe and stable production and maintain a reasonable furnace type of the blast furnace, thereby extending the service life of the blast furnace, improving the production efficiency and economic benefits of the blast furnace, and thus achieving energy conservation and emission reduction in the iron-making system.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solution: A method for measuring and adjusting the heat flux intensity of a blast furnace of the present invention has the following innovative features:

[0006] (1) The inlet temperature T of the blast furnace cooling wall is obtained by monitoring 进 , outlet temperature of blast furnace cooling wall T 出 and the cooling water flow rate V in the outlet water pipe of the blast furnace cooling wall;

[0007] (2) Using the inlet temperature T 进 , outlet temperature T 出 And the cooling water flow rate V, and the heat flux intensity J of the blast furnace cooling wall is calculated by the formula 实测 ;

[0008] (3) The heat flux intensity J of the blast furnace cooling wall calculated above is 实测 Heat flux intensity control standard J 标准 For comparison, if the heat flux intensity J of the blast furnace cooling wall 实测 If the heat flux intensity J of the blast furnace cooling wall is within the normal range, it will continue to be maintained; 实测 If it exceeds the normal range, it will be adjusted and brought back to the normal range.

[0009] Preferably, in the above step (1), a temperature sensor I is installed at the inlet end of the blast furnace cooling wall, the model of the temperature sensor I is HTGYT-II, and its measurement range is 0 to 100°C, and the inlet temperature T of the blast furnace cooling wall is monitored by the temperature sensor I. 进 .

[0010] Preferably, in the above step (1), a temperature sensor II is installed at the outlet of the blast furnace cooling wall, the model of the temperature sensor II is HTGYT-II, and its measurement range is 0 to 100°C, and the outlet temperature T of the blast furnace cooling wall is monitored by the temperature sensor II. 出 .

[0011] Preferably, in the above step (1), a rotor flowmeter is installed in the outlet water pipe of the blast furnace cooling stave, the model of the rotor flowmeter is LZDX type, and the cooling water flow rate V in the outlet water pipe of the blast furnace cooling stave is monitored by the rotor flowmeter.

[0012] Preferably, in the above step (2), the calculation formula for the heat flux intensity of the blast furnace cooling wall is:

[0013]

[0014] In the formula, J 实测 It indicates the heat flux intensity of the blast furnace cooling wall, and its unit is Kcal / (m 2 h), where V represents the cooling water flow rate in the outlet water pipe of the blast furnace cooling wall, and its unit is Kg / s; T 出It indicates the outlet temperature of the blast furnace cooling wall, and its unit is ℃; T 进 represents the inlet temperature of the blast furnace cooling wall, and its unit is ℃; C represents the heat capacity of cooling water, and its unit is 4.2KJ / (Kg·℃); S represents the area of ​​the blast furnace cooling wall, and its unit is m 2 .

[0015] Preferably, in the above step (3), the heat flux intensity control standard J 标准 Set as: Normal value ≤8000Kcal / (m 2 ·h)、8000Kcal / (m 2 ·h)<Alarm value≤10000Kcal(m 2 h)、10000Kcal / (m 2 ·h)<warning value≤12000Kcal / (m 2 ·h)、12000Kcal / (m 2 ·h)<danger value greater than<15000Kcal / (m 2 ·h), and extremely dangerous value ≥15000Kcal / (m 2 h).

[0016] Preferably, in the above step (3), the specific method for adjusting the heat flux intensity of the blast furnace cooling wall to within the normal value range is:

[0017] (3.1) According to the actual operation of the blast furnace, the smelting intensity of the blast furnace is reduced by reducing the operating air volume, thereby reducing the heat flux intensity of the blast furnace cooling wall;

[0018] (3.2) Optimize the environment inside the blast furnace by precisely controlling the temperature and pressure inside the blast furnace, reduce unnecessary heat loss and heat concentration, and thus reduce the heat flux intensity of the blast furnace cooling wall;

[0019] (3.3) The heat flux intensity of the blast furnace cooling wall is adjusted by adjusting the amount of blast furnace cooling water.

[0020] Preferably, if the heat flux intensity of the blast furnace cooling wall is still not adjusted to the normal value range by the above method, high-aluminum anhydrous or mud is pressed into the blast furnace body area online to prevent the risk of furnace body burn-through.

[0021] Preferably, grouting is performed between the furnace shell and the cooling wall, and between the cooling wall and the brick lining of the blast furnace to block the air gap, improve the heat transfer conditions, and thus reduce the temperature and heat flux intensity of the cooling wall of the blast furnace.

[0022] Beneficial effects of the present invention:

[0023] (1) The present invention can accurately determine the heat flow distribution inside the blast furnace and the changes in the cooling intensity of various parts of the blast furnace, provide effective operation guidance for blast furnace operators, and help blast furnace operators to control the heat flow intensity to assist the safe and stable production of the blast furnace and maintain a reasonable furnace type of the blast furnace, thereby extending the service life of the blast furnace, improving the production efficiency and economic benefits of the blast furnace, and thus achieving energy conservation and emission reduction of the ironmaking system;

[0024] (2) The present invention can monitor the water temperature and water flow in real time by providing temperature sensor I, temperature sensor II and rotor flowmeter, thereby avoiding various disadvantages brought about by manual measurement, reducing human errors, saving manpower and reducing labor intensity. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 The present invention is a schematic diagram of a method for measuring and adjusting the heat flux intensity of a blast furnace. DETAILED DESCRIPTION

[0027] The technical solution of the present invention will be clearly and completely described below through specific implementation methods.

[0028] A method for measuring and adjusting the heat flux intensity of a blast furnace according to the present invention is as follows: Figure 1 As shown, the following steps are included:

[0029] (1) The inlet temperature T of the blast furnace cooling wall is obtained by monitoring 进 , outlet temperature of blast furnace cooling wall T 出 And the cooling water flow rate V in the outlet water pipe of the blast furnace cooling wall.

[0030] In the above steps, a temperature sensor I is installed at the inlet end of the blast furnace cooling wall. The model of the temperature sensor I is HTGYT-II, and its measurement range is 0-100°C. The inlet temperature T of the blast furnace cooling wall is monitored by the temperature sensor I. 进 .

[0031] In the above steps, a temperature sensor II is installed at the outlet of the blast furnace cooling wall. The model of the temperature sensor II is HTGYT-II, and its measurement range is 0-100°C. The outlet temperature T of the blast furnace cooling wall is monitored by the temperature sensor II. 出 .

[0032] In the above steps, a rotor flowmeter is installed in the outlet water pipe of the blast furnace cooling stave. The rotor flowmeter is of LZDX type. The rotor flowmeter is used to monitor the cooling water flow rate V in the outlet water pipe of the blast furnace cooling stave.

[0033] (2) Using the inlet temperature T 进 , outlet temperature T 出 And the cooling water flow rate V, and the heat flux intensity J of the blast furnace cooling wall is calculated by the formula 实测 ;

[0034] In the above steps, the calculation formula of the heat flux intensity of the blast furnace cooling wall is:

[0035]

[0036] In the formula, J 实测 It indicates the heat flux intensity of the blast furnace cooling wall, and its unit is Kcal / (m 2 h), where V represents the cooling water flow rate in the outlet water pipe of the blast furnace cooling wall, and its unit is Kg / s; T 出 It indicates the outlet temperature of the blast furnace cooling wall, and its unit is ℃; T 进 represents the inlet temperature of the blast furnace cooling wall, and its unit is ℃; C represents the heat capacity of cooling water, and its unit is 4.2KJ / (Kg·℃); S represents the area of ​​the blast furnace cooling wall, and its unit is m 2 .

[0037] (3) The heat flux intensity J of the blast furnace cooling wall calculated above is 实测 Heat flux intensity control standard J 标准 For comparison, if the heat flux intensity J of the blast furnace cooling wall 实测 If the heat flux intensity J of the blast furnace cooling wall is within the normal range, it will continue to be maintained; 实测 If it exceeds the normal range, it will be adjusted and brought back to the normal range.

[0038] In the above steps, the heat flux intensity control standard J 标准 Set as: Normal value ≤8000Kcal / (m 2 ·h)、8000Kcal / (m 2 ·h)<Alarm value≤10000Kcal(m 2 h)、10000Kcal / (m 2 ·h)<warning value≤12000Kcal / (m 2 ·h)、12000Kcal / (m 2 ·h)<danger value greater than<15000Kcal / (m 2·h), and extremely dangerous value ≥15000Kcal / (m 2 h).

[0039] In the above steps, the specific method for adjusting the heat flux intensity of the blast furnace cooling wall to within the normal value range is:

[0040] (3.1) According to the actual operation of the blast furnace, the smelting intensity of the blast furnace is reduced by reducing the operating air volume, thereby reducing the heat flux intensity of the blast furnace cooling wall;

[0041] (3.2) Optimize the environment inside the blast furnace by precisely controlling the temperature and pressure inside the blast furnace, reduce unnecessary heat loss and heat concentration, and thus reduce the heat flux intensity of the blast furnace cooling wall;

[0042] (3.3) The heat flux intensity of the blast furnace cooling wall is adjusted by adjusting the amount of blast furnace cooling water.

[0043] If the heat flux intensity of the blast furnace cooling wall is still not adjusted to the normal value range by the above method, the risk of burning through the furnace body is prevented by online pressing of high-aluminum anhydrous or mud into the blast furnace body area; wherein, grouting is performed between the furnace shell and the cooling wall of the blast furnace, and between the cooling wall of the blast furnace and the brick lining to block the air gap, improve the heat transfer conditions, and thus reduce the temperature and heat flux intensity of the blast furnace cooling wall.

[0044] Embodiment 1

[0045] The cooling wall area S of the blast furnace used in the present invention is 1.0314m 2 When the temperature sensor I measures the inlet temperature T of the blast furnace cooling wall, 进 The outlet temperature of the blast furnace cooling wall measured by temperature sensor II is T 出 The temperature is 27.2℃, and the rotor flowmeter measures the cooling water flow rate V in the outlet water pipe of the blast furnace cooling wall to be 3.11Kg / s.

[0046]

[0047] It can be seen that the heat flux intensity J of the blast furnace cooling wall 实测 In the heat flux intensity control standard J 标准 It is within the normal value range, indicating that the heat intensity of the blast furnace cooling wall does not need to be adjusted at this time.

[0048] Embodiment 2

[0049] The cooling wall area S of the blast furnace used in the present invention is 1.0314m 2 When the temperature sensor I measures the inlet temperature T of the blast furnace cooling wall, 进 The outlet temperature of the blast furnace cooling wall measured by temperature sensor II is T 出The temperature is 27.2℃, and the rotor flowmeter measures the cooling water flow rate V in the outlet water pipe of the blast furnace cooling wall to be 3.11Kg / s.

[0050]

[0051] It can be seen that the heat flux intensity J of the blast furnace cooling wall 实测 In the heat flux intensity control standard J 标准 The warning value is reached, at this time the heat flux intensity of the blast furnace cooling wall needs to be adjusted to the normal value range.

[0052] Embodiment 3

[0053] The cooling wall area S of the blast furnace used in the present invention is 1.1212m 2 When the temperature sensor I measures the inlet temperature T of the blast furnace cooling wall, 进 The outlet temperature of the blast furnace cooling wall measured by temperature sensor II is T 出 The temperature is 26.5℃, and the rotor flowmeter measures the cooling water flow rate V in the outlet water pipe of the blast furnace cooling wall to be 2.98Kg / s.

[0054]

[0055] It can be seen that the heat flux intensity J of the blast furnace cooling wall 实测 In the heat flux intensity control standard J 标准 The alarm value is reached, and the heat flux intensity of the blast furnace cooling wall needs to be adjusted to the normal value range.

[0056] Beneficial effects of the present invention:

[0057] (1) The present invention can accurately determine the heat flow distribution inside the blast furnace and the changes in the cooling intensity of various parts of the blast furnace, provide effective operation guidance for blast furnace operators, and help blast furnace operators to control the heat flow intensity to assist the safe and stable production of the blast furnace and maintain a reasonable furnace type of the blast furnace, thereby extending the service life of the blast furnace, improving the production efficiency and economic benefits of the blast furnace, and thus achieving energy conservation and emission reduction of the ironmaking system;

[0058] (2) The present invention can monitor the water temperature and water flow in real time by providing temperature sensor I, temperature sensor II and rotor flowmeter, thereby avoiding various disadvantages brought about by manual measurement, reducing human errors, saving manpower and reducing labor intensity.

[0059] The embodiments described above are merely descriptions of preferred implementation modes of the present invention, and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary engineering technicians in the field should fall within the protection scope of the present invention. The technical contents for which protection is sought in the present invention have been fully recorded in the technical requirements.

Claims

1. A method for measuring and adjusting the heat flux intensity of a blast furnace, characterized in that The following steps are involved: (1) The inlet temperature T of the blast furnace cooling wall is obtained by monitoring 进 , outlet temperature of blast furnace cooling wall T 出 and the cooling water flow rate V in the outlet water pipe of the blast furnace cooling wall; (2) Using the inlet temperature T 进 , outlet temperature T 出 And the cooling water flow rate V, and the heat flux intensity J of the blast furnace cooling wall is calculated by the formula 实测 ; (3) The heat flux intensity J of the blast furnace cooling wall calculated above is 实测 Heat flux intensity control standard J 标准 For comparison, if the heat flux intensity J of the blast furnace cooling wall 实测 If the heat flux intensity J of the blast furnace cooling wall is within the normal range, it will continue to be maintained; 实测 If it exceeds the normal range, it will be adjusted and brought back to the normal range.

2. A method for measuring and adjusting the heat flux intensity of a blast furnace according to claim 1, characterized in that: In the above step (1), a temperature sensor I is installed at the inlet end of the blast furnace cooling wall. The model of the temperature sensor I is HTGYT-II, and its measurement range is 0 to 100°C. The inlet temperature T of the blast furnace cooling wall is monitored by the temperature sensor I. 进 .

3. The method for measuring and adjusting the heat flux intensity of a blast furnace according to claim 1, characterized in that: In the above step (1), a temperature sensor II is installed at the outlet of the blast furnace cooling wall. The temperature sensor II is of the HTGYT-II type and has a measurement range of 0 to 100°C. The outlet temperature T of the blast furnace cooling wall is monitored by the temperature sensor II. 出 .

4. A method for measuring and adjusting the heat flux intensity of a blast furnace according to claim 1, characterized in that: In the above step (1), a rotor flowmeter is installed in the outlet water pipe of the blast furnace cooling stave. The rotor flowmeter is of LZDX type, and the cooling water flow rate V in the outlet water pipe of the blast furnace cooling stave is monitored by the rotor flowmeter.

5. The method for measuring and adjusting the heat flux intensity of a blast furnace according to claim 1, characterized in that: In the above step (2), the calculation formula of the heat flux intensity of the blast furnace cooling wall is: In the formula, J 实测 It indicates the heat flux intensity of the blast furnace cooling wall, and its unit is Kcal / (m 2 h), where V represents the cooling water flow rate in the outlet water pipe of the blast furnace cooling wall, and its unit is Kg / s; T 出 It indicates the outlet temperature of the blast furnace cooling wall, and its unit is ℃; T 进 represents the inlet temperature of the blast furnace cooling wall, and its unit is ℃; C represents the heat capacity of cooling water, and its unit is 4.2KJ / (Kg·℃); S represents the area of ​​the blast furnace cooling wall, and its unit is m 2 .

6. The method for measuring and adjusting the heat flux intensity of a blast furnace according to claim 1, characterized in that: In the above step (3), the heat flux intensity control standard J 标准 Set as: Normal value ≤8000Kcal / (m 2 ·h)、8000Kcal / (m 2 ·h)<Alarm value≤10000Kcal(m 2 h)、10000Kcal / (m 2 ·h)<warning value≤12000Kcal / (m 2 ·h)、12000Kcal / (m 2 ·h)<danger value greater than<15000Kcal / (m 2 ·h), and extremely dangerous value ≥15000Kcal / (m 2 h).

7. A method for measuring and adjusting the heat flux intensity of a blast furnace according to claim 6, characterized in that: In the above step (3), the specific method for adjusting the heat flux intensity of the blast furnace cooling wall to within the normal value range is: (3.1) According to the actual operation of the blast furnace, the smelting intensity of the blast furnace is reduced by reducing the operating air volume, thereby reducing the heat flux intensity of the blast furnace cooling wall; (3.2) Optimize the environment inside the blast furnace by precisely controlling the temperature and pressure inside the blast furnace, reduce unnecessary heat loss and heat concentration, and thus reduce the heat flux intensity of the blast furnace cooling wall; (3.3) The heat flux intensity of the blast furnace cooling wall is adjusted by adjusting the amount of blast furnace cooling water.

8. A method for measuring and adjusting the heat flux intensity of a blast furnace according to claim 7, characterized in that: If the heat flux intensity of the blast furnace cooling wall is still not adjusted to the normal value range by the above method, high-aluminum anhydrous or mud is pressed into the blast furnace body area online to prevent the risk of furnace body burn-through.

9. A method for measuring and adjusting the heat flux intensity of a blast furnace according to claim 8, characterized in that: By grouting between the furnace shell and the cooling wall, and between the cooling wall and the brick lining of the blast furnace, the air gap is blocked, the heat transfer conditions are improved, and the temperature and heat flux intensity of the cooling wall of the blast furnace are reduced.

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