Power-loss emergency device and method for blast furnace cooling water system
阅读说明：本技术 一种高炉冷却水系统失电应急装置和方法 (Power-loss emergency device and method for blast furnace cooling water system ) 是由 武彦琴 解俊琴 马帅 于 2019-11-08 设计创作，主要内容包括：一种高炉冷却水系统失电应急装置及方法,应急装置包括柴油机泵、事故水塔、补水泵、切断阀、止回阀、管路、液位变送器；事故水塔依次连接1#切断阀、第一止回阀、3#切断阀、4#切断阀并分流一路连接高炉风口套,高炉风口套连接高炉净循环水池；高炉净循环水池经过水塔补水泵连接到事故水塔,高炉净循环水池经过冷却水电泵冷却水电泵柴油机泵、第二止回阀连接高炉风口套,事故水塔经过7#切断阀连接高炉净循环水池,事故水塔经过6#切断阀连接排污池。本发明保证了为高炉供水的持续性和稳定性,即使在泵站电源失电时,通过此应急供水系统能为高炉供水应急,避免发生风口小套烧坏和炸裂的事件。(A blast furnace cooling water system power-off emergency device and a method thereof are disclosed, wherein the emergency device comprises a diesel engine pump, an accident water tower, a water replenishing pump, a cut-off valve, a check valve, a pipeline and a liquid level transmitter; the accident water tower is sequentially connected with a No. 1 cut-off valve, a first check valve, a No. 3 cut-off valve and a No. 4 cut-off valve, and one branch of the branch is connected with a blast furnace tuyere sleeve which is connected with a blast furnace clean circulating water tank; the blast furnace clean circulating water tank is connected to the accident water tower through a water tower water replenishing pump, the blast furnace clean circulating water tank is connected with a blast furnace tuyere sleeve through a cooling water electric pump diesel engine pump and a second check valve, the accident water tower is connected with the blast furnace clean circulating water tank through a 7# cut-off valve, and the accident water tower is connected with a sewage disposal tank through a 6# cut-off valve. The emergency water supply system ensures the continuity and stability of water supply for the blast furnace, and can supply water for the blast furnace for emergency through the emergency water supply system even when the power supply of the pump station is out of power, thereby avoiding the events of burning and explosion of the tuyere small sleeve.)
1. A blast furnace cooling water system power-off emergency device is characterized by comprising a diesel engine pump, an accident water tower, a water replenishing pump, a stop valve, a check valve, a pipeline and a liquid level transmitter; the accident water tower is sequentially connected with a No. 1 cut-off valve, a first check valve, a No. 3 cut-off valve and a No. 4 cut-off valve, and one branch of the branch is connected with a blast furnace tuyere sleeve which is connected with a blast furnace clean circulating water tank; the blast furnace clean circulating water tank is connected to the accident water tower through a water tower water replenishing pump, the blast furnace clean circulating water tank is connected with a blast furnace tuyere sleeve through a cooling water electric pump diesel engine pump and a second check valve, the accident water tower is connected with the blast furnace clean circulating water tank through a 7# cut-off valve, and the accident water tower is connected with a sewage disposal tank through a 6# cut-off valve.
2. The emergency device for the power failure of the cooling water system of the blast furnace as claimed in claim 1, wherein under normal operation conditions, the 1# cut-off valve, the 3# cut-off valve, the 4# cut-off valve and the 7# cut-off valve are in normally open states, and the 5# cut-off valve and the 6# cut-off valve are in closed states;
when the first check valve is overhauled, the No. 1 cut-off valve and the No. 3 cut-off valve are closed; when the first check valve is tested during the damping down period, the 4# cut-off valve is closed, the 5# cut-off valve is opened, and the test effluent returns to the clean circulating water pool of the blast furnace;
when the accident water tower is cleaned to improve the water quality in the tower, the 4# cut-off valve is closed, the 5# cut-off valve and the 6# cut-off valve are opened, and the 7# cut-off valve is closed at the same time; the 7# cut-off valve is normally open of an overflow valve, and when the liquid level of the water tower is higher than the overflow pipe, water automatically flows into the water tank;
the maintenance method of the safe water tower comprises the following steps: periodically opening the valve 6 for pollution discharge; periodically opening a valve 5 to observe the liquid level of the water tower, if the liquid level continuously drops, indicating that the system is normal, otherwise, maintaining the first check valve;
the first check valve is used for preventing process cooling water from entering the water tower to be decompressed in normal operation and automatically opening when the pressure is lost; the second check valve is used for preventing water in the water tower from entering a pipeline close to the water pump to influence the cooling water quantity of the furnace tuyere small sleeve when the system water is in pressure loss.
3. A power-off emergency method for a blast furnace cooling water system is characterized by comprising the following steps:
(1) the emergency device of claim 1 is connected to a water outlet pipeline of a blast furnace clean circulating water system;
(2) the diesel engine pump is automatically started, the diesel engine pump is started for at least 15 seconds of idling pressure rise time, and cooling water of the blast furnace tuyere sleeve is provided by the accident water tower in the idling pressure rise time;
(3) when the diesel engine pump is pressurized to the rated pressure and flow, cooling water is supplied by the diesel engine pump; the second check valve is automatically closed through pressure difference, and the accident water tower stops supplying water;
(4) the volume of the accident water tower can ensure that the water supply is carried out for at least 15 minutes; the high liquid level is kept in the accident water tower at any time, and the water is supplied by a water tower water replenishing pump; the start and stop of the water-tower water-replenishing pump are linked with the liquid level transmitter, the water-tower water-replenishing pump automatically starts replenishing water when the liquid level is low, and the water-tower water-replenishing pump automatically stops when the liquid level reaches high.
Technical Field
The invention belongs to the technical field of blast furnace cooling water supply, and particularly relates to a power-off emergency device and method for a blast furnace cooling water system.
Background
The blast furnace cooling water supply system mainly has the function of supplying cooling water to various cooling devices and ensuring that the heat flow intensity of the cooling devices is controlled within the tolerable range. The blast furnace cooling water system mainly comprises: cooling of a blast furnace body cooling water system, a furnace bottom cooling water system, a blast furnace tuyere, a hot blast valve, a tuyere big sleeve, a tuyere small sleeve, a cross temperature measuring device, hydraulic equipment, a mud gun, a gear box and the like. Wherein the cooling of the tuyere small sleeve belongs to a net ring high-pressure system in a water supply system. The tuyere small sleeve has high temperature and high requirement on cooling water, so that the flow rate of the cooling water is required to be high, more heat can be taken away conveniently, and the cooling is facilitated; secondly, the cooling water is required to have no water cut-off phenomenon absolutely. Therefore, a standby water pump is arranged in daily operation, and when the operation water pump fails and stops, the standby water pump is automatically started to continuously supply water to the system. However, when the power supply of the power system loses power, the running pump and the standby pump cannot be started, and accidents of water cut-off, air port small sleeves or burst can occur. To avoid such occurrences requires the design and sophistication of emergency systems and devices.
Disclosure of Invention
The invention provides a power-off emergency device and method for a blast furnace cooling water system, which can be used for avoiding the situation that a tuyere small sleeve of an iron-making furnace is continuously cooled by water under the condition of power-off failure of a power system, protecting equipment and avoiding the accidents of burning out and explosion.
A power-off emergency device for a blast furnace cooling water system comprises a diesel engine pump, an accident water tower, a water replenishing pump, a stop valve, a check valve, a pipeline and a liquid level transmitter.
The accident water tower is sequentially connected with a No. 1 cut-off valve, a first check valve, a No. 3 cut-off valve and a No. 4 cut-off valve, and one branch of the branch is connected with a blast furnace tuyere sleeve which is connected with a blast furnace clean circulating water tank; the blast furnace clean circulating water tank is connected to an accident water tower through a water tower water replenishing pump, the blast furnace clean circulating water tank is connected with a blast furnace tuyere sleeve through a cooling water electric pump diesel engine pump and a second check valve, the accident water tower is connected with the blast furnace clean circulating water tank through a 7# cut-off valve, and the accident water tower is connected with a sewage disposal tank through a 6# cut-off valve;
under the normal operation condition, the 1# cut-off valve, the 3# cut-off valve, the 4# cut-off valve and the 7# cut-off valve are in normally open states, and the 5# cut-off valve and the 6# cut-off valve are in closed states;
when the first check valve is overhauled, the No. 1 cut-off valve and the No. 3 cut-off valve are closed; when the first check valve is tested during the damping down period, the 4# cut-off valve is closed, the 5# cut-off valve is opened, and the test effluent returns to the clean circulating water pool of the blast furnace;
when the accident water tower is cleaned to improve the water quality in the tower, the 4# cut-off valve is closed, the 5# cut-off valve and the 6# cut-off valve are opened, and the 7# cut-off valve is closed at the same time;
the 7# cut-off valve is normally open of an overflow valve, and when the liquid level of the water tower is higher than the overflow pipe, water automatically flows into the water tank;
the maintenance method of the safe water tower comprises the following steps: periodically opening the valve 6 for pollution discharge; periodically, the
The first check valve is used for preventing process cooling water from entering the water tower to be decompressed in normal operation and automatically opening when the pressure is lost; the second check valve is used for preventing water in the water tower from entering a pipeline close to the water pump to influence the cooling water quantity of the furnace tuyere small sleeve when the system water is in pressure loss.
A power-off emergency method for a blast furnace cooling water system is characterized by comprising the following steps:
(1) an emergency device is connected on a water outlet pipeline of the blast furnace water purification and circulation system;
(2) when the dual power of the system loses power, the diesel engine pump is automatically started, the diesel engine pump is started for at least 15 seconds of idling boosting time, and the cooling water of the blast furnace tuyere sleeve is provided by the accident water tower within the idling boosting time (in the idling boosting time of the diesel engine, the first cooling water electric pump and the second cooling water electric pump are suddenly stopped, when the pressure is suddenly reduced, the second check valve is instantly opened, and the water of the accident water tower instantly enters the pipeline by gravity to supplement water supply);
(3) when the diesel engine pump is pressurized to the rated pressure and flow, cooling water is supplied by the diesel engine pump; the second check valve is automatically closed through pressure difference, and the accident water tower stops supplying water;
(4) the volume of the accident water tower can ensure that the water supply is carried out for at least 15 minutes; the high liquid level is kept in the accident water tower at any time, and the water is supplied by a water tower water replenishing pump. The start and stop of the water-tower water-replenishing pump are linked with the liquid level transmitter, the water-tower water-replenishing pump automatically starts replenishing water when the liquid level is low, and the water-tower water-replenishing pump automatically stops when the liquid level reaches high.
The emergency water supply system ensures the continuity and stability of water supply for the blast furnace, and can supply water for the blast furnace for emergency through the emergency water supply system even when the power supply of the pump station is out of power, thereby avoiding the events of burning and explosion of the tuyere small sleeve.
Drawings
Fig. 1 is a schematic view of the emergency apparatus according to the present invention.
In the figure, 1# cut-off valves, 2, first check valves 1, 3# cut-off valves, 4# cut-off valves, 5# cut-off valves, 6# cut-off valves, 7# cut-off valves, 8, accident water tower, 9, liquid level transmitter, 10, second check valves, 11, first cooling water electric pump, 12, second cooling water electric pump, 13, diesel engine pump, 14, water tower water replenishing pump, 15, blast furnace clean circulating water pool, 16, blast furnace tuyere sleeve.
Detailed Description
A blast furnace cooling water system power-off emergency device comprises a diesel engine pump, an accident water tower, a water replenishing pump, a stop valve, a check valve, a pipeline and a liquid level transmitter;
the accident water tower 8 is sequentially connected with a No. 1 cut-off valve 1, a first check valve 2, a No. 3 cut-off valve 3 and a No. 4 cut-off valve 4, one branch of the branch is connected with a blast
the mounting height of the accident water tower 8 is at least greater than the water supply pressure of the cooling water pump main pipe converted to the height of the water column, for example, the mounting height of the water tower is at least 100 meters when the pressure is 10 kgf; for example, the pressure is 8kgf, and the installation height of the water tower is at least 80 meters.
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