A water leakage prevention and freezing prevention device for a furnace top

Abstract

The utility model discloses a kind of furnace top water beating water leakage prevention freeze-proof device, belong to blast furnace equipment field, including the furnace top water beating pipeline arranged from the upward extension of blast furnace bottom, electric valve for controlling water beating is provided on the furnace top water beating pipeline at blast furnace top, drain total valve is provided at the place below furnace top water beating pipeline electric valve, three-way pipeline is provided between drain total valve and electric valve, drain valve is provided on three-way pipeline, three-way pipeline is connected to water leakage processing place.The utility model can solve the problem that a small amount of water remaining in water beating pipeline leaks into furnace, which is not only harmful to furnace condition but also causes water waste, and can conveniently drain water from the pipeline, eliminating the risk of trace leakage and freeze cracking.

Description

Technical Field

[0001] This utility model relates to the field of blast furnace equipment, and in particular to a furnace top water pumping device for preventing leakage and freezing. Background Technology

[0002] In modern blast furnace ironmaking processes, top water injection technology is a crucial gas temperature control measure. This technology involves spraying atomized water into the high-temperature blast furnace gas through gas outlet pipes or gravity dust collectors in the blast furnace top area to achieve rapid cooling. Its main purposes are: to protect downstream gas purification systems, such as bag filters, from high-temperature damage; to maintain stable top pressure to ensure smooth blast furnace operation; and to extend the service life of the top charging equipment and gas pipeline system. Therefore, the top water injection system is an indispensable component for the stable, efficient, and safe operation of the blast furnace.

[0003] Although top-feed water injection technology offers significant benefits, existing systems have significant shortcomings in handling residual water in pipelines during non-operational periods (when the blast furnace does not require water injection for cooling). This leads to a series of pressing technical challenges: Minor leaks due to valve incomplete closure: Existing top-feed water injection systems typically rely on electric valves to cut off the water supply. However, due to limitations in valve structure, aging and wear of seals, insufficient precision of actuators, or occasional control signal malfunctions, achieving absolute zero leakage is difficult even when the valve is in the commanded closed state. This minute, continuous, or intermittent water seepage slowly flows into the blast furnace through the injection nozzles or pipeline connections. Its danger lies in: disrupting furnace stability. The seeping water droplets instantly and violently vaporize upon entering the high-temperature zone of the blast furnace, causing a rapid expansion of local gas volume and pressure fluctuations. This uncontrolled and unpredictable disturbance disrupts the existing thermal balance and airflow distribution within the blast furnace, potentially leading to furnace condition fluctuations, affecting molten iron quality and increasing the fuel ratio. In severe cases, it can even induce abnormal furnace conditions such as hanging and collapse of the charge, threatening the smooth operation of the blast furnace. The cumulative effect of seemingly minor leaks can lead to substantial water waste, increasing production costs and contradicting the principles of green and low-carbon production. The risk of frozen pipes in winter is also a concern. Water supply pipes inevitably need to be laid from the water source along the blast furnace body, eventually extending to various water supply points on the furnace top. Most sections of these pipes are exposed to the open environment for extended periods. In cold seasons, when ambient temperatures drop below freezing, the stagnant water remaining in the pipes will freeze and expand. The serious consequences are: pipe rupture due to freezing expansion. The volume expansion of ice generates enormous internal stress, easily causing metal pipes to crack, welds to break, or joints to be damaged. Frozen pipes not only paralyze the water supply system, affecting the blast furnace's normal temperature control capabilities, but also lead to sudden leaks. Pipe ruptures can cause large amounts of water to splash or flow into high-temperature areas or electrical equipment, triggering safety accidents such as steam explosions, equipment short circuits, and personnel slipping, forcing unplanned blast furnace shutdowns for emergency repairs and causing significant economic losses.

[0004] The most straightforward solution to the problem of freezing and cracking in winter is to insulate the pipelines. However, the high-altitude environment of the boiler top water pipes presents insurmountable engineering challenges: wrapping, fixing, and sealing the pipeline insulation layer at high altitudes in confined spaces, near high-temperature, high-pressure, and gas-filled areas, is extremely difficult and dangerous, requiring highly skilled and safe workers. Insulation materials are prone to aging, damage, and detachment under high-temperature, humid, vibrating, and weathering conditions. Regular inspection, repair, or replacement also faces difficulties due to the high-altitude work and high maintenance costs. Even with insulation, the risk of residual water freezing inside the pipes cannot be completely eliminated under extreme low temperatures or prolonged periods of inactivity, especially near valves and at the lowest points of the pipeline.

[0005] Therefore, there is an urgent need to develop a dedicated drainage device that is structurally sound, safe, reliable, and easy to operate. This device can efficiently and thoroughly drain the residual water in the relevant pipes when the furnace top is not used for water pumping, thereby fundamentally eliminating the risk of minor leaks and freezing cracks, while avoiding the huge implementation and maintenance burden brought about by high-altitude insulation. Utility Model Content

[0006] The technical problem this invention aims to solve is to provide a furnace top water supply anti-leakage and anti-freezing device. It addresses the issue of small amounts of residual water leaking into the furnace from the water supply pipes, which is detrimental to furnace conditions and wastes water. The device allows for convenient drainage of water from the pipes, eliminating the risk of minor leaks and freezing.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a furnace top water pumping anti-leakage and anti-freezing device, including a furnace top water pumping pipe extending upward from the bottom of the blast furnace, an electric valve for controlling water pumping is installed on the furnace top water pumping pipe at the top of the blast furnace, a main drain valve is installed below the electric valve of the furnace top water pumping pipe, a three-way pipe is installed between the main drain valve and the electric valve, a drain valve is installed on the three-way pipe, and the three-way pipe is connected to the leakage treatment point.

[0008] A further improvement of this utility model is that the water leakage treatment point is a return water tank or industrial return water pipe set at the end of the tee pipe.

[0009] A further improvement of this utility model is that the main drain valve and the drain valve are controlled by a PLC.

[0010] Due to the adoption of the above technical solution, the technical progress achieved by this utility model is as follows: by setting a main drain valve and a three-way pipe below the electric valve 2, the water leaking from the furnace top water pipe can be discharged in time by opening the valve, effectively eliminating the risk of minor leakage and freezing. By connecting the three-way pipe to the industrial return water pipe or return water tank, the leaked water can be effectively recycled. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of the antifreeze device of this utility model;

[0013] Among them, 1. Furnace top water supply pipe, 2. Electric valve, 3. Main drain valve, 4. T-pipe, and 5. Return water tank. Detailed Implementation

[0014] The present invention will be further described in detail below with reference to embodiments:

[0015] like Figure 1 The diagram shows a structural schematic of a furnace top water spraying and anti-leakage device. The furnace top water spraying is for blast furnaces, spraying atomized water into the high-temperature furnace top gas to achieve rapid cooling. The top water spraying pipe 1 extends upwards from the bottom of the blast furnace to the top, and an electric valve 2 is installed on the top water spraying pipe 1 to control the water spraying. An additional main drain valve 3 is installed on the top water spraying pipe 1, located below the electric valve 2. A three-way pipe 4 is opened between the main drain valve 3 and the electric valve 2. A drain valve is installed on the three-way pipe to control its opening and closing; the specific valve can be selected according to needs, such as an electric ball valve or a butterfly valve. The outlet pipe of the three-way pipe 4 is connected to a leak treatment point to treat excess water leaking from the furnace top water spraying pipe 1. In this embodiment, the leak treatment point is a return water tank 5, i.e., a return water tank 5 is set at the end of the three-way pipe 4. Excess water leaking from the furnace top water spraying pipe 1 will flow into the return water tank 5 through the three-way pipe 4 for water recycling. Leakage can be addressed at multiple locations, including industrial return water pipes.

[0016] The main drain valve 3 and the drain valves on the three-way pipe 4 are controlled by a PLC. When top water supply is not in use, the main drain valve 4 is closed, and the drain valve on the three-way pipe 4 is opened to drain the water stored in the top water supply pipe 1 into the return water pipe, emptying the top water supply pipe 1 and ensuring no water leakage into the furnace, preventing the pipes from freezing and cracking in winter. This prevents accidents and water waste caused by leakage. When top water supply is in use, the drain valve is closed, and the main drain valve 3 is opened to smoothly transport water from top to bottom to the furnace top. This new design prevents water leakage into the furnace when top water supply is not needed and also prevents pipes and valves from freezing and cracking in winter. It strictly prevents any possible furnace accidents and prohibits water waste.

[0017] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A furnace top water pumping anti-leakage and anti-freezing device, comprising a furnace top water pumping pipe (1) extending upward from the bottom of the blast furnace, wherein an electric valve (2) for controlling water pumping is provided on the furnace top water pumping pipe (1) at the top of the blast furnace, characterized in that: A main drain valve (3) is installed below the electric valve (2) of the water supply pipe (1) on the top of the furnace. A three-way pipe (4) is installed between the main drain valve (3) and the electric valve (2). A drain valve is installed on the three-way pipe (4). The three-way pipe (4) is connected to the leak treatment point.

2. The furnace top water-spraying anti-leakage and anti-freezing device according to claim 1, characterized in that: The leak treatment point is a return water tank (5) or an industrial return water pipe set at the end of the tee pipe (4).

3. The furnace top water-spraying anti-leakage and anti-freezing device according to claim 1, characterized in that: The main drain valve (3) and the drain valve are controlled by the PLC.

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