CN111947026A - Method for rapidly judging whether gate valve flashboard between nitrogen pressure tank and water replenishing pump falls off or not - Google Patents

Abstract

The invention relates to a method for rapidly judging whether a gate valve flashboard between a nitrogen pressure tank and a water replenishing pump falls off, when a pipeline of the water replenishing pump to the nitrogen pressure tank is not filled with water, a standby water pump is started firstly, if the standby water pump runs and the water is filled normally, the pipeline of the original working water pump is judged to be in fault, and when the standby water pump runs and the water is still not filled, the gate valve flashboard falls off; checking the gate valves one by one; determining a gate valve of a specific falling gate plate: 1) opening and closing the gate valve, and judging that the gate plate of the gate valve falls off when no resistance exists in the process of rotating the valve rod; 2) opening a drainage valve on a pipeline between the gate valve and the water pump to drain water, and judging that the gate valve gate plate falls off when the water level of the nitrogen pressure tank is not reduced; 3) and judging that the gate valve flashboard falls off when the gate valve is completely opened from closing and no water pressure exists in the gate valve connecting pipeline. The invention avoids the water supplementing pump from working all the time and doing ineffective work, and the water temperature in the volute of the water pump is increased and the energy consumption is lost due to the long-term rotation of the water pump. The judgment time is shortened, and the overhaul time is shortened.

Description

Method for rapidly judging whether gate valve flashboard between nitrogen pressure tank and water replenishing pump falls off or not

Technical Field

The invention relates to a method for quickly judging whether a gate valve flashboard between a nitrogen pressure tank and a water replenishing pump falls off or not.

Background

The industrial fresh water is filtered by a filter, passes through cation bed ion exchange, then removes carbon dioxide, enters anion bed ion exchange, and finally enters a desalting water tank for standby. The moisturizing pump is chain with nitrogen pressure jar fluviograph, and at the water level lower limit, the water pump automatic start draws water from the demineralized water tank and through the oxygen-eliminating device deoxidization, and moisturizing is to nitrogen pressure jar, and when the water level reachd the water level upper limit, the automatic shutdown of water pump. The cation bed of the anion bed is regenerated by industrial sodium hydroxide and hydrochloric acid.

The circulating pump rotates at a high speed, and water in the pipeline of the demineralized water closed circulation system obtains energy to move. The water at the suction inlet of the water pump is pressurized and then passes through a water pipeline and a valve, and then is distributed to blast furnace cooling equipment (a cooling wall and a cooling plate), a tuyere secondary sleeve, a furnace base water cooling pipe and valves of a hot blast furnace. And (3) the highest point of the water consumption point is subjected to steam removal through a degassing tank, the water returns to an automatic back-flushing filter for filtration, and the evaporative air cooler is cooled and finally reaches a water pump suction inlet to finish the whole circulation process.

Because the consumption of water, need not lack of water through nitrogen pressure jar and moisturizing pump moisturizing, guarantee the system. Various valves on the pipeline are used as flow regulating, checking and cooling wall inner leakage and maintaining water cut-off control valves, and meanwhile, water is cut off in an accident state, so that water shortage and emergency use of standby water are avoided.

Under the normal condition of water supplement of the desalted water closed-loop circulating system, the water supplement amount is constant every time. The water leakage point is fixed, the water leakage amount is also fixed, the water supplementing time interval is approximately the same under the influence of various conditions, if the time interval is suddenly shortened and is continuously unchanged all the time, the water leakage point of the exposed pipeline is not existed, and the water leakage of the blast furnace cooling equipment can be determined. When the leakage amount is large, the leakage amount is searched by ignition in the production process, if the cooling equipment is damaged at a longer damping-down opportunity, the damage of the cooling equipment can be determined by a pressure test method, the method of introducing industrial water is changed to be maintained for use, and if the damping-down opportunity exists for a long time, the service life is prolonged by a method of penetrating a metal hose or installing a cooling rod.

Disclosure of Invention

The invention aims to solve the technical problem of providing a method for quickly judging whether a gate valve flashboard between a nitrogen pressure tank and a water replenishing pump falls off or not, and avoiding the increase of water temperature in a water pump volute and the loss of energy consumption caused by long-term rotation of a water pump after the gate valve flashboard falls off.

In order to achieve the purpose, the invention adopts the following technical scheme:

the method for rapidly judging whether the gate valve flashboard between the nitrogen pressure tank and the water replenishing pump falls off or not comprises the steps that when no water flows through a pipeline of the water replenishing pump to the nitrogen pressure tank, a standby water pump is started firstly, and when the standby water pump runs and no water flows, the gate valve flashboard falls off; checking the gate valves one by one; gate valve confirmation was performed by:

1) opening and closing the gate valve, and judging that the gate plate of the gate valve falls off when no resistance exists in the process of rotating the valve rod;

2) opening a drainage valve on a pipeline between the gate valve and the water pump to drain water, and judging that the gate valve gate plate falls off when the water level of the nitrogen pressure tank is not reduced;

3) and judging that the gate valve flashboard falls off when the gate valve is completely opened from closing and no water pressure exists in the gate valve connecting pipeline.

Compared with the prior art, the invention has the beneficial effects that:

the invention avoids the water supplementing pump from working all the time and doing ineffective work, and the water temperature in the volute of the water pump is increased and the energy consumption is lost due to the long-term rotation of the water pump. The judgment time is shortened, the overhaul time is accelerated, and the normal operation is recovered as soon as possible.

Detailed Description

The invention is further illustrated by the following examples:

the following examples describe the invention in detail. These examples are merely illustrative of the best embodiments of the present invention and do not limit the scope of the invention.

The method for rapidly judging whether a gate valve flashboard between a nitrogen pressure tank and a water replenishing pump falls off or not is characterized in that when no water flows through a pipeline of the water replenishing pump to the nitrogen pressure tank, a standby water pump is started firstly, if the standby water pump runs and the water flows normally, the pipeline of the original working water pump is judged to be in fault, and when the standby water pump runs and no water flows, the gate valve flashboard falls off; checking the gate valves one by one; determining a gate valve of a specific falling gate plate:

1) opening and closing the gate valve, and judging that the gate plate of the gate valve falls off when no resistance exists in the process of rotating the valve rod;

2) opening a drainage valve on a pipeline between the gate valve and the water pump to drain water, and judging that the gate valve gate plate falls off when the water level of the nitrogen pressure tank is not reduced;

3) and judging that the gate valve flashboard falls off when the gate valve is completely opened from closing and no water pressure exists in the gate valve connecting pipeline.

The invention can quickly judge the falling of the gate valve flashboard and shorten the maintenance time. The water temperature in the volute of the water pump is increased and the energy consumption loss caused by long-term rotation of the water pump is avoided because the water replenishing pump works all the time and does invalid work. The problem that water in a nitrogen pressure tank of a water supplementing device cannot be supplemented normally, water is deficient after long-time operation, a standby water source is not available, and the blast furnace is caused to have an emergency damping down is avoided.

Claims (1)

1. The method for rapidly judging whether the gate valve flashboard between the nitrogen pressure tank and the water replenishing pump falls off is characterized in that when no water is supplied to a pipeline of the water replenishing pump to the nitrogen pressure tank, a standby water pump is started, and when the standby water pump runs, no water is supplied, the gate valve flashboard is determined to fall off; checking the gate valves one by one; gate valve confirmation was performed by:

1) opening and closing the gate valve, and judging that the gate plate of the gate valve falls off when no resistance exists in the process of rotating the valve rod;

2) opening a drainage valve on a pipeline between the gate valve and the water pump to drain water, and judging that the gate valve gate plate falls off when the water level of the nitrogen pressure tank is not reduced;

3) and judging that the gate valve flashboard falls off when the gate valve is completely opened from closing and no water pressure exists in the gate valve connecting pipeline.