Backwashing method of hot water pump for blast furnace slag pool

Abstract

The invention discloses a hot water pump backwashing method for a blast furnace slag pool. The method comprises the following steps: 1) adding an electric valve on a hot water header pipe of an original slag flushing system to control the water flow direction; (2) connecting a pipeline to the backwashing header pipe at the front end of the newly-added electric valve, adding the electric valve on the newly-added pipeline for controlling, disconnecting the original backwashing pipeline and blocking; and (3) opening the electric valve on the newly added pipeline, closing the electric valve of the newly added hot water header pipe and opening the corresponding backwashing valve for backwashing the slag pool under the conditions that the slag flushing system normally runs and the water level of the cold water pool is allowed. By improving and optimizing the backwashing process, backwashing work can be effectively guaranteed after each slag iron is discharged and water granulated slag in the slag filter tank is cleaned, the stability of the water filtering capacity of the slag filter tank is guaranteed, and normal production of the blast furnace is maintained.

Description

Technical Field

[0001] The invention relates to a field, and in particular to a method for backwashing a blast furnace slag pool using a hot water pump. Background Art

[0002] The blast furnace slag pool is an integral part of the blast furnace ironmaking process, and is mainly used to process and store the slag produced by the blast furnace. During the blast furnace ironmaking process, the molten slag is introduced into the slag pool through the slag flushing ditch. The slag pool provides a place for the slag to cool and deposit. In the slag pool, the slag and water are physically separated for subsequent reuse or treatment.

[0003] In the blast furnace smelting process, the backwashing operation of the blast furnace slag pool is very important. In the production process of the blast furnace, because the two iron holes rotate and continuously tap iron, the slag pump must operate 24 hours a day to provide slag water for the slag ditch to flush the slag. In this way, the backwashing of the slag filter cannot be achieved, resulting in the compaction of the slag filter, which greatly affects the slag pool's water filtering capacity and causes the entire slag flushing system to be unstable. In addition, if the slag flushing pump fails and cannot flush the slag normally, it will also directly affect the normal production of the blast furnace.

[0004] Therefore, it is necessary to develop new technologies in a targeted manner to overcome the above problems. Summary of the invention

[0005] Purpose of the invention: In view of the shortcomings and defects of the prior art, the present invention provides a method for backwashing a blast furnace slag pool with a hot water pump. By improving and optimizing the backwashing process, it can effectively ensure that after the slag and iron of each furnace are discharged, the water slag in the slag filter tank is cleaned and the backwashing work is completed, thereby ensuring the stability of the water filtering capacity of the slag pool and maintaining normal production of the blast furnace.

[0006] Technical solution: The method for backwashing a blast furnace slag pool with a hot water pump of the present invention is characterized in that it comprises the following steps:

[0007] 1) Add an electric valve to the original hot water main of the slag flushing system to control the water flow direction;

[0008] 2) Connect a pipe to the backwash main pipe at the front end of the newly added electric valve, add an electric valve to the newly added pipe for control, disconnect the original backwash pipe and seal it;

[0009] 3) When the slag flushing system is operating normally and the water level in the cold water pool allows, open the electric valve on the newly added pipeline, close the electric valve of the newly added hot water main, and open the corresponding backwash valve to backwash the slag pool.

[0010] Wherein, in the step 1), four hot water pumps are provided on the hot water main.

[0011] Among them, the four hot water pumps are used in a manner of two in use and two in reserve.

[0012] Wherein, the electric valve in steps 2) and 3) is a backwash main valve.

[0013] Wherein, the step 3) is implemented by programming an automatic program for the backwash operation of the hot water pump.

[0014] Wherein, in the step 3), when the liquid level of the cold water tank allows, a hot water pump is used for backwashing to achieve the effect of normal backwashing of the slag tank.

[0015] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: By improving and optimizing the backwashing process and controlling the filtering capacity of the slag pool through an advanced system, the present invention can effectively ensure the backwashing work after the slag iron of each furnace is discharged and the water slag in the slag filter pool is cleaned, thereby ensuring the stability of the slag pool's water filtering capacity and maintaining the normal production of the blast furnace. The present invention includes the application and development of precise management of the cold water pool and slag pool liquid level and cold and hot water pumps, reasonable slag flushing water allocation strategy, intelligent control system, and efficient slag pool backwashing. DETAILED DESCRIPTION

[0016] The technical solution of the present invention is further described below in conjunction with specific implementation methods.

[0017] The method for backwashing a blast furnace slag pool with a hot water pump of the present invention comprises the following steps:

[0018] 1) Add an electric valve to the original hot water main of the slag flushing system to control the water flow direction; the number of hot water pumps is 4; the 4 hot water pumps are used in a way that 2 are in use and 2 are in reserve.

[0019] 2) Connect a pipe to the backwash main pipe at the front end of the newly added electric valve (backwash main valve), add an electric valve on the newly added pipe for control, disconnect the original backwash pipe and seal it.

[0020] 3) When the slag flushing system is operating normally and the water level in the cold water pool allows, open the electric valve (backwash main valve) on the newly added pipeline, close the electric valve of the newly added hot water main, and open the corresponding backwash valve to backwash the slag pool.

[0021] The present invention improves and optimizes the backwashing procedure of the slag flushing system, and uses an advanced control system to control the filtering capacity of the slag pool, which can effectively ensure the backwashing work after the slag iron of each furnace is discharged and the water slag in the slag filter pool is cleaned, thereby ensuring the stability of the slag pool water filtering capacity and maintaining the normal production of the blast furnace. The present invention includes the application and development of fine cold water pool and slag pool liquid level and cold and hot water pump management, reasonable slag flushing water allocation strategy, intelligent control system and efficient slag pool backwashing.

[0022] Embodiment: The present invention has been used in the No. 2 blast furnace of the First Ironmaking Plant of Nanjing Iron and Steel Group. After commissioning, this method can effectively ensure that after the slag and iron of each furnace are discharged, the water slag in the slag filter tank is cleaned and the backwashing work is completed, ensuring the stability of the slag tank's water filtration capacity and maintaining the normal production of the blast furnace. With the improvement of the degree of automation, the backwashing operation of the modern slag flushing system adopts an advanced control system, which can more accurately control the backwashing process, further improving the working efficiency of the slag flushing system and the continuity and stability of the blast furnace iron discharge.

[0023] After practical benefit analysis:

[0024] The present invention can eliminate the influence of backwashing on the iron-out time. After each furnace is finished, it takes 5 minutes to backwash. Calculated based on 10 furnaces per day, the total backwashing time is 50 minutes per day, and the iron-out can be increased by 50 minutes per day, about 225 tons per day.

[0025] The invention can increase the iron output by 225 tons per day. The annual production is calculated based on 350 days and the benefit per ton of iron is 50 yuan / ton, and the annual benefit is: 350*225*50 / 10000=3.9375 million yuan.

Claims

1. A method for backwashing a blast furnace slag pool using a hot water pump, characterized in that: The steps include: 1) Add an electric valve to the original hot water main of the slag flushing system to control the water flow direction; 2) Connect a pipe to the backwash main pipe at the front end of the newly added electric valve, add an electric valve to the newly added pipe for control, disconnect the original backwash pipe and seal it; 3) When the slag flushing system is operating normally and the water level in the cold water pool allows, open the electric valve on the newly added pipeline, close the electric valve of the newly added hot water main, and open the corresponding backwash valve to backwash the slag pool.

2. The method for backwashing a blast furnace slag pool with a hot water pump according to claim 1, characterized in that: In the step 1), four hot water pumps are provided on the hot water main.

3. The method for backwashing a blast furnace slag pool with a hot water pump according to claim 1, characterized in that: The four hot water pumps are used in a manner of two for use and two for backup.

4. The method for backwashing a blast furnace slag pool with a hot water pump according to claim 1, characterized in that: The electric valve in steps 2) and 3) is a backwash main valve.

5. The method for backwashing a blast furnace slag pool with a hot water pump according to claim 1, characterized in that: The step 3) is implemented by programming an automatic program for the backwash operation of the hot water pump.

6. The method for backwashing a blast furnace slag pool using a hot water pump according to claim 1, characterized in that: In the step 3), when the liquid level of the cold water tank allows, a hot water pump is used for backwashing to achieve the effect of normal backwashing of the slag tank.