阅读说明：本技术 一种高炉炼铁冲渣池的白烟治理方法 (White smoke treatment method for blast furnace ironmaking slag flushing tank ) 是由 赵金阳 李明恩 高伟 于 2020-12-23 设计创作，主要内容包括：本发明公开了一种高炉炼铁冲渣池的白烟治理方法,包括如下步骤：S1、冲渣处理：S2、冲渣池余热回收：S3、热蒸汽回收。本发明通过在造粒塔的上端设置一个集气罩来对热蒸汽进行收集,由于白烟是在热压作用,造粒塔内处于负压状态,周围的空气被吸入塔内与蒸汽形成混合物从烟囱排出,外排时混合气体遇冷生成凝结水而产生的,因此,在通过集气罩对热蒸汽进行收集之后,可大大减少白烟的产生,连接管上设有若干个换热器,通过换热器可以对热蒸汽进行换热和降温,同时通过连接管下侧的第一喷淋管可以对连接管以及造粒塔进行加温处理,可以有效减少周围不凝结气体的渗入,第二喷淋管可以对热蒸汽进行热量回收,更加节能环保。(The invention discloses a white smoke treatment method for a blast furnace ironmaking slag flushing tank, which comprises the following steps: s1, slag flushing treatment: s2, recovering waste heat of the slag flushing tank: and S3, recovering hot steam. The gas-collecting hood is arranged at the upper end of the granulation tower to collect hot steam, and white smoke is in a negative pressure state in the granulation tower under the action of hot pressing, ambient air is sucked into the tower to form a mixture with the steam and is discharged from a chimney, and the mixed gas is cooled to generate condensed water during discharging, so that the generation of the white smoke can be greatly reduced after the hot steam is collected through the gas-collecting hood.)

1. A white smoke treatment method for a blast furnace ironmaking slag flushing pool is characterized by comprising the following steps:

s1, slag flushing treatment: high-temperature slag discharged by the blast furnace flows to a granulation tower through a slag ditch, after being crushed by a granulation wheel, circulating water is sprayed out of a granulator, slag is subjected to water quenching through the circulating water, so that a slag-water mixture is formed, and the mixture is dehydrated by a dehydration device to realize water-slag separation;

s2, recovering waste heat of the slag flushing tank: after the slag-water mixture is dehydrated, finished slag is conveyed to a slag field through a conveying belt to be stored, high-temperature wastewater generated during dehydration is stored in a first recovery tank, a second recovery tank is arranged on one side of the first recovery tank, and a first circulating pump is arranged in the first recovery tank;

s3, hot steam recovery: the method is characterized in that a discharge chimney at the top of a granulation tower is changed into a gas collecting hood, a large amount of vapor is generated in the granulation tower in the water quenching process, the vapor generated in the slag flushing process is collected through the gas collecting hood, a connecting pipe is arranged between the gas collecting hood and the granulation tower, a plurality of heat exchangers are arranged on the connecting pipe, heat exchange treatment can be carried out on the hot vapor through the heat exchangers, a plurality of first spray pipes are arranged at the lower pipe section of the connecting pipe, a second spray pipe is arranged in the gas collecting hood, the first spray pipes are communicated with a first circulating pump, the hot water in a first recovery tank can be conveyed to the first spray pipes through the first circulating pump and is sprayed out through the first spray pipes, high-temperature waste water is stored in the first recovery tank, the connecting pipe can be heated, so that the gas in the first spray pipes is in a micro-positive pressure state, the infiltration of non-condensable gas at the periphery is reduced, and the, the hot steam is condensed and recovered by cooling water sprayed out of the second spray pipe.

2. The white smoke control method of the blast furnace ironmaking slag flushing tank according to claim 1, characterized by comprising the following steps: in the step S2, the volume of the second recovery tank is larger than that of the first recovery tank, a second circulation pump is arranged in the second recovery tank, and a water outlet end of the second circulation pump is communicated with a water inlet end of the granulator.

3. The white smoke control method of the blast furnace ironmaking slag flushing tank according to claim 1, characterized by comprising the following steps: in step S2, fine slag may be deposited in the first recovery tank, and during the treatment, the fine slag at the bottom of the first recovery tank is fished out by the grab bucket.

4. The white smoke control method of the blast furnace ironmaking slag flushing tank according to claim 1, characterized by comprising the following steps: in step S2, the waste water in the second recycling tank is transported to the granulator for recycling, and during this process, the waste water needs to be filtered for a second time to prevent the granulator from being clogged.

5. The white smoke control method of the blast furnace ironmaking slag flushing tank according to claim 1, characterized by comprising the following steps: in the step S3, the connection pipe is L-shaped and is fixedly connected to the gas-collecting channel through the flange.

6. The white smoke control method of the blast furnace ironmaking slag flushing tank according to claim 1, characterized by comprising the following steps: in the step S1, an air suction hood is disposed outside the granulation tower, an evacuation pipe is disposed on the air suction hood, and the air suction hood can collect water vapor overflowing from the air collection hood, and the collected air is evacuated through the evacuation pipe.

7. The white smoke control method of the blast furnace ironmaking slag flushing tank according to claim 1, characterized by comprising the following steps: in step S3, a waste water recovery tank is disposed at the lower side of the gas collecting hood, and after the cooling water sprays the water vapor, the cooling water absorbs heat of the hot steam, and at this time, the waste water becomes high-temperature waste water, and the high-temperature waste water is led away by the water pump to further recover waste heat.

8. The white smoke control method of the blast furnace ironmaking slag flushing tank according to claim 1, characterized by comprising the following steps: in step S3, a safety door is provided at the top of the gas collecting hood to prevent steam explosion.

Technical Field

The invention belongs to the field of blast furnace ironmaking waste gas treatment, and particularly relates to a white smoke treatment method for a blast furnace ironmaking slag flushing tank.

Background

The slag flushing treatment is a common blast furnace slag treatment method and has the following principle: the slag is quenched by high-speed water flow to be granulated into loose water slag. Although this method is simple in operation and low in cost, in the actual operation, when slag is cooled, a large amount of "white smoke" is generated, which is a phenomenon that the inside of a granulation tower is in a negative pressure state due to a hot pressing effect, ambient air is sucked into the tower and forms a mixture with steam to be discharged from a chimney, and when the mixed gas is discharged, condensed water is generated when the mixed gas is cooled. As sulfur-containing gas is generated in the slag flushing process, the acid gas is discharged from a chimney at the top of the prilling tower along with steam. These acid-containing gases have a number of adverse effects on the staff and the equipment, and therefore the white smoke from the flushing pit must be treated.

Disclosure of Invention

The invention aims to provide a white smoke treatment method for a blast furnace ironmaking slag flushing tank, which aims to solve the problems in the background technology.

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

a white smoke treatment method for a blast furnace ironmaking slag flushing pool comprises the following steps:

s1, slag flushing treatment: high-temperature slag discharged by the blast furnace flows to a granulation tower through a slag ditch, after being crushed by a granulation wheel, circulating water is sprayed out of a granulator, slag is subjected to water quenching through the circulating water, so that a slag-water mixture is formed, and the mixture is dehydrated by a dehydration device to realize water-slag separation;

s2, recovering waste heat of the slag flushing tank: after the slag-water mixture is dehydrated, finished slag is conveyed to a slag field through a conveying belt to be stored, high-temperature wastewater generated during dehydration is stored in a first recovery tank, a second recovery tank is arranged on one side of the first recovery tank, and a first circulating pump is arranged in the first recovery tank;

s3, hot steam recovery: the method is characterized in that a discharge chimney at the top of a granulation tower is changed into a gas collecting hood, a large amount of vapor is generated in the granulation tower in the water quenching process, the vapor generated in the slag flushing process is collected through the gas collecting hood, a connecting pipe is arranged between the gas collecting hood and the granulation tower, a plurality of heat exchangers are arranged on the connecting pipe, heat exchange treatment can be carried out on the hot vapor through the heat exchangers, a plurality of first spray pipes are arranged at the lower pipe section of the connecting pipe, a second spray pipe is arranged in the gas collecting hood, the first spray pipes are communicated with a first circulating pump, the hot water in a first recovery tank can be conveyed to the first spray pipes through the first circulating pump and is sprayed out through the first spray pipes, high-temperature waste water is stored in the first recovery tank, the connecting pipe can be heated, so that the gas in the first spray pipes is in a micro-positive pressure state, the infiltration of non-condensable gas at the periphery is reduced, and the, the hot steam is condensed and recovered by cooling water sprayed out of the second spray pipe.

Preferably, in step S2, the volume of the second recovery tank is greater than that of the first recovery tank, and a second circulation pump is disposed in the second recovery tank, and a water outlet end of the second circulation pump is communicated with a water inlet end of the granulator.

Preferably, in step S2, fine slag is deposited in the first recovery tank, and the fine slag at the bottom of the first recovery tank is taken out by a grab bucket during processing.

Preferably, in step S2, the waste water in the second recovery pond is sent to the granulator for recycling, and during this process, the waste water needs to be filtered again to prevent the granulator from being blocked.

Preferably, in step S3, the connection pipe is L-shaped and is fixedly connected to the gas-collecting hood via a flange.

Preferably, in step S1, an air suction hood is disposed outside the prilling tower, an evacuation pipe is disposed on the air suction hood, the air suction hood can collect water vapor overflowing from the air collection hood, and the collected air is evacuated through the evacuation pipe.

Preferably, in step S3, a waste water recovery tank is disposed below the gas collecting hood, and after the cooling water sprays the water vapor, the cooling water absorbs heat of the hot steam, so that the waste water becomes high-temperature waste water, and the high-temperature waste water is led away by the water pump to further recover waste heat.

Preferably, in step S3, a safety door is provided at the top of the gas collecting hood to prevent steam explosion.

Compared with the prior art, the invention has the beneficial effects that: the gas collecting hood is arranged at the upper end of the granulation tower to collect hot steam, and white smoke is in a negative pressure state in the granulation tower under the action of hot pressing, ambient air is sucked into the granulation tower to form a mixture with the steam and is discharged from a chimney, and the mixed gas is cooled to generate condensed water during discharging, so that the generation of the white smoke can be greatly reduced after the hot steam is collected through the gas collecting hood.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

A white smoke treatment method for a blast furnace ironmaking slag flushing pool comprises the following steps:

s1, slag flushing treatment: high-temperature slag discharged by the blast furnace flows to a granulation tower through a slag ditch, after being crushed by a granulation wheel, circulating water is sprayed out of a granulator, slag is subjected to water quenching through the circulating water, so that a slag-water mixture is formed, and the mixture is dehydrated by a dehydration device to realize water-slag separation;

s2, recovering waste heat of the slag flushing tank: after the slag-water mixture is dehydrated, finished slag is conveyed to a slag field through a conveying belt to be stored, high-temperature wastewater generated during dehydration is stored in a first recovery tank, a second recovery tank is arranged on one side of the first recovery tank, and a first circulating pump is arranged in the first recovery tank;

s3, hot steam recovery: the method is characterized in that a discharge chimney at the top of a granulation tower is changed into a gas collecting hood, a large amount of vapor is generated in the granulation tower in the water quenching process, the vapor generated in the slag flushing process is collected through the gas collecting hood, a connecting pipe is arranged between the gas collecting hood and the granulation tower, a plurality of heat exchangers are arranged on the connecting pipe, heat exchange treatment can be carried out on the hot vapor through the heat exchangers, a plurality of first spray pipes are arranged at the lower pipe section of the connecting pipe, a second spray pipe is arranged in the gas collecting hood, the first spray pipes are communicated with a first circulating pump, the hot water in a first recovery tank can be conveyed to the first spray pipes through the first circulating pump and is sprayed out through the first spray pipes, high-temperature waste water is stored in the first recovery tank, the connecting pipe can be heated, so that the gas in the first spray pipes is in a micro-positive pressure state, the infiltration of non-condensable gas at the periphery is reduced, and the, the hot steam is condensed and recovered by cooling water sprayed out of the second spray pipe.

Specifically, in step S2, the volume of the second recovery tank is greater than the volume of the first recovery tank, a second circulation pump is disposed in the second recovery tank, a water outlet end of the second circulation pump is communicated with a water inlet end of the granulator, and water in the first recovery tank overflows into the second recovery tank after being filled.

Specifically, in step S2, fine slag may be deposited in the first recovery tank, and during the treatment, the fine slag at the bottom of the first recovery tank is fished out by the grab bucket.

Specifically, in step S2, the waste water in the second recovery tank is sent to the granulator for recycling, and during this process, the waste water needs to be filtered again to prevent the granulator from being blocked.

Specifically, in step S3, the connection pipe is L-shaped and is fixedly connected to the gas collecting channel through the flange.

Specifically, in step S1, an air suction hood is disposed outside the granulation tower, an evacuation pipe is disposed on the air suction hood, and water vapor overflowing from the air collection hood can be collected by the air suction hood, and the collected gas is evacuated by the evacuation pipe.

Specifically, in step S3, a waste water recovery tank is disposed on the lower side of the gas collecting hood, and after the cooling water sprays the water vapor, the cooling water absorbs heat of the hot steam, so that the waste water becomes high-temperature waste water, and the high-temperature waste water is guided away by the water pump to further recover waste heat.

Specifically, in step S3, a safety door is provided at the top of the gas collecting hood to prevent steam explosion.

The gas collecting hood is arranged at the upper end of the granulation tower to collect hot steam, and white smoke is in a negative pressure state in the granulation tower under the action of hot pressing, ambient air is sucked into the granulation tower to form a mixture with the steam and is discharged from a chimney, and the mixed gas is cooled to generate condensed water during discharging, so that the generation of the white smoke can be greatly reduced after the hot steam is collected through the gas collecting hood.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.