CN203569127U - Blast furnace gas alkali-spraying dechlorination device - Google Patents

Abstract

The utility model relates to an alkali spraying and chlorine removal device for blast furnace gas. The alkali spraying and chlorine removal device includes an alkali spraying tower. There is an air inlet on the top, and an air outlet is provided on the top of the alkali spraying tower, which is connected to an outlet pipe; inside the alkali spraying tower and on the upper side of the air inlet, an alkali spraying device and a water spraying device are arranged at intervals from bottom to top. and filler dehydration device; the air inlet is connected with an air inlet pipe, and a spray device is arranged in the air inlet pipe. Before the gas enters the soda spraying tower, it is humidified and cooled by spraying water mist in the intake pipe, and the water in the sprayed gas is in a saturated state; the gas enters the soda spraying tower from the inlet of the soda spraying tower, and the airflow is from bottom to top Firstly, the gas is neutralized by spraying alkali through the first layer of alkali spraying device. Since the gas has been humidified and cooled before, the acidic medium in the gas can be quickly and efficiently removed to achieve a better acid-base neutralization effect.

Description

Blast furnace gas spray alkali dechlorination device

technical field

The utility model relates to a blast furnace gas alkali spraying chlorine removal device, in particular to a blast furnace gas alkali spraying chlorine removal device for treating a large amount of acid medium (mainly chloride ions) in the blast furnace gas after fully dry dust removal.

Background technique

In recent years, the blast furnace gas full-dry bag dust removal technology in domestic iron and steel enterprises has been widely promoted. Since the removal of acidic media in the gas after dry dust removal is not considered, the acidic media in the gas will be enriched in large quantities after a certain period of time. , resulting in a series of problems such as corrosion of low-temperature blast furnace gas pipelines, pipeline compensators and subsequent process equipment, shortening the service life of blast furnace gas supporting facilities.

With the gradual application of fully dry gas dedusting technology, the corrosion of acidic medium in gas has gradually attracted the attention of domestic counterparts. In recent years, a blast furnace gas spraying alkali removal device has been developed in China, but because the alkali spraying and chlorine removal are only carried out in the alkali spraying tower, and the layout of the spray guns is insufficient, the alkali spraying tower equipment is large in size and the amount of water sprayed is relatively large , large electricity consumption; in addition, the effect of alkali spraying and neutralization of blast furnace gas needs to be improved.

Therefore, the present inventor proposes a blast furnace gas spray alkali dechlorination device by virtue of years of experience and practice in related industries to overcome the defects of the prior art.

Utility model content

The purpose of the utility model is to provide a blast furnace gas spray alkali dechlorination device, which can achieve better chlorine washing and cooling effects.

Another purpose of this utility model is to provide a blast furnace gas alkali spraying and chlorine removal device, which can optimize the layout of the alkali spraying and water spraying layer spray guns, can more effectively remove the acidic medium in the blast furnace gas, reduce the amount of water spraying, and save energy consumption. Electricity, so that the pH of the condensed water in the blast furnace gas is controlled at 7 to 8, which meets the requirements of subsequent users.

The purpose of this utility model is achieved in this way, a blast furnace gas alkali spraying chlorine removal device, the alkali spraying chlorine removal device includes an alkali spraying tower, the lower end of the alkali spraying tower is provided with a cone bucket, and the bottom of the cone bucket is provided with a drainage device; The side wall of the lower part of the alkali tower is provided with an air inlet, and the top of the alkali spray tower is provided with an air outlet, which is connected with an outlet pipe; inside the alkali spray tower and located on the upper side of the air inlet, spray nozzles are arranged at intervals from bottom to top. An alkali device, a water spray device and a packing dehydration device; the air inlet is connected with an air inlet pipe, and a spray device is arranged in the air inlet pipe.

In a preferred embodiment of the present invention, the alkali spraying device and the water spraying device are respectively composed of a plurality of spray guns surrounding the side wall of the alkali spray tower, and each of the spray guns penetrates the side wall from the outside of the alkali spray tower and points to the spraying tower. Alkali tower center setting.

In a preferred embodiment of the present invention, the spray guns include a plurality of short spray guns, a plurality of long spray guns and a plurality of medium-length spray guns.

In a preferred embodiment of the present invention, the plurality of short spray guns, the plurality of long spray guns and the plurality of medium-length spray guns are evenly distributed around the side wall of the alkali spraying tower.

In a preferred embodiment of the present utility model, the spray gun is provided with a plurality of nozzles downward.

In a preferred embodiment of the present utility model, a packing flushing device is provided above the packing dewatering device.

In a preferred embodiment of the present utility model, the packing flushing device is composed of an annular spray gun.

In a preferred embodiment of the present utility model, a relief valve is provided on the gas outlet pipeline and at a position close to the gas outlet.

In a preferred embodiment of the present utility model, a water pool is provided under the alkali spraying tower.

From the above, the utility model of blast furnace gas spray alkali dechlorination device adds a spray device to the air intake pipe, humidifies the gas and reduces the temperature of the gas before entering the alkali spray tower, which not only creates a better environment for the alkali spray process in the tower. conditions, it can also reduce the spraying water consumption in the soda spraying tower, which can save 35% of the water consumption compared with the existing technology, and also reduce the operation of the spraying water pump group, so as to achieve the purpose of saving electricity, which is different from the existing Compared with the technology, it can save electricity by 30%; the utility model adjusts the work sequence of spraying water first and then spraying alkali in the existing device, and changes it to the work flow of spraying water mist first, then spraying alkali, and then spraying water. Achieve better chlorine washing and cooling effects; the utility model optimizes the layout of spray guns for alkali spraying and water spraying layers, and adopts the inner ring arrangement of the nozzle center of several long spray guns, the middle ring arrangement of nozzle heads of medium-length spray guns and the outer nozzle arrangement of short spray guns. The optimized "three-ring" layout of the ring layout can more effectively remove the acid medium in the blast furnace gas, reduce the equipment diameter and height of the alkali spraying tower, and reduce the overall weight of the equipment by 10%. The gas treated by the alkali dechlorination device finally controls the pH value of the condensed water at 7-8, which meets the requirements of subsequent users.

Description of drawings

The following drawings are only intended to illustrate and explain the utility model schematically, and do not limit the scope of the utility model. in:

Fig. 1: is the structural schematic diagram of the blast furnace gas spraying alkali-removing device of the present invention.

Figure 2: It is a schematic diagram of the layout of spray guns inside the alkali spray tower of the present invention.

Detailed ways

In order to have a clearer understanding of the technical features, purposes and effects of the utility model, the specific implementation of the utility model is now described with reference to the accompanying drawings.

As shown in Figure 1 and Figure 2, the utility model proposes a blast furnace gas alkali spraying chlorine removal device 100, the alkali spraying chlorine removal device 100 includes a spraying alkali tower 1, the lower end of the alkali spraying tower 1 is provided with a cone bucket 8, the cone The bottom of the bucket is provided with a drainage device 81; the side wall of the alkali spray tower 1 bottom is provided with an air inlet 11, and the top of the alkali spray tower is provided with an air outlet 12, and the air outlet 12 is connected with an air outlet pipeline 121; inside the alkali spray tower 1 And be positioned at air inlet 11 upper side and be provided with caustic spraying device 2, water spraying device 3 and filler dehydration device 4 sequentially from bottom to top; There are spraying devices 5 .

As mentioned above, the coal gas passes through the spray (water mist) device 5 to humidify and cool down in the air intake pipe 111 before entering the alkali spray tower 1, and the moisture in the sprayed coal gas is in a saturated state; 11 Entering the soda spraying tower, the air flow is from bottom to top, firstly through the first layer of soda spraying device 2 to spray soda and neutralize the gas, since the gas has been humidified and cooled before, this can quickly and efficiently remove the acidity in the gas Medium (chloride ions and some sulfate ions) to achieve better acid-base neutralization effect.

In this embodiment, in order to ensure the effect of alkali spraying, the concentrated alkali solution needs to be mixed with soft water for dilution. The gas neutralized by alkali spraying passes through the second layer of water spraying device 3 immediately. This water spraying process can not only fully reduce the temperature of the gas, but also absorb part of the acid-base neutralization droplets in the gas. In this embodiment, a pool 9 is provided below the soda spraying tower 1; the second layer of water spraying device 3 can be recycled by using the lower part of the soda spraying tower, and it can be treated regularly, which greatly improves the reuse of industrial water rate while reducing water consumption.

In order to ensure the spraying effect and coverage area of the two-layer devices of the first layer of alkali spraying device 2 and the second layer of water spraying device 3, no dead space is left in the spraying section, and the arrangement of the spray guns on the spraying device needs to be relatively uniform. In this embodiment, the alkali spraying device 2 and the water spraying device 3 are respectively composed of a plurality of spray guns 6 surrounding the side wall of the alkali spray tower 1. Each of the spray guns 6 penetrates the side wall from the outside of the alkali spray tower 1 and points to the Alkali tower 1 is set in the center. As shown in Figure 2, described spray gun 6 comprises a plurality of short spray guns 61, a plurality of long spray guns 62 and a plurality of medium-length spray guns 63; They are evenly distributed around the side wall of the alkali spray tower 1 respectively. As shown in Figure 2, the arrangement of each layer of spray guns adopts the optimized "three-ring" arrangement of several long spray guns 62 in the center inner ring of spray heads, middle length spray guns 63 in the middle ring of spray heads, and short spray guns 61 in the outer ring of spray heads. The spray guns of the caustic spraying device and the water spraying device are arranged in the same way. The spray gun is provided with a plurality of nozzles downward.

After the gas has been sprayed in two layers, the mechanical water content in the gas is relatively high, and the gas needs to be dehydrated. As shown in Figure 1, the gas passes through the packing dehydration device 4 from bottom to top. After the small water droplets in the gas pass through the garland packing, they converge into large particles and are dehydrated by the principle of gravity.

In this embodiment, a filler flushing device 7 is further provided above the filler dehydration device 4; the filler flushing device 7 is composed of an annular spray gun. The main reason is that the system runs for a long time, and the packing is easy to scale and block, which will cause excessive pressure loss in the system, and it needs to be sprayed and flushed with high-pressure water regularly.

On the gas outlet pipe 121 at the top of the alkali spray tower 1 and near the gas outlet 12, a release valve 122 is provided; when the gas pressure is too high, it will be automatically opened and released; when the gas pressure is normal, it will be in a closed state. Mainly in order to prevent gas from spewing out from the drainage device 81 at the bottom of the soda spraying tower during high pressure, causing safety accidents.

The utility model blast furnace gas alkali spraying chlorine removal device adds a spray device in the intake pipe, humidifies the gas and lowers the gas temperature before entering the alkali spraying tower, not only creates better conditions for the alkali spraying process in the tower, but also can Reduce the spraying water consumption in the alkali spraying tower, which can save 35% of the water consumption compared with the existing technology, and also reduce the operation of the spraying water pump group, so as to achieve the purpose of saving electricity. Compared with the existing technology, it can save Electricity 30%; the utility model adjusts the working sequence of spraying water first and then alkali spraying in the existing device, and changes it to the work flow of spraying water mist first, then spraying alkali, and then spraying water, thus, better washing can be achieved Chlorine, cooling effect; the utility model optimizes the arrangement of spray guns for alkali spraying and water spraying layer, and adopts the optimization of the inner ring arrangement of the nozzle center of several long spray guns, the middle ring arrangement of nozzle heads of medium-length spray guns and the outer ring arrangement of short spray guns. The arrangement of "three rings" can more effectively remove the acid medium in the blast furnace gas, reduce the equipment diameter and height of the alkali spraying tower, and reduce the overall weight of the equipment by 10%; through the blast furnace gas alkali spraying chlorine removal device of the utility model Finally, the PH value of the condensed water is controlled at 7-8, which meets the requirements of subsequent users.

The above descriptions are only illustrative specific implementations of the present utility model, and are not intended to limit the scope of the present utility model. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of the present invention shall fall within the protection scope of the present invention.

Claims (9)

1. A blast furnace gas alkali spraying chlorine removal device, the alkali spraying chlorine removal device comprises a spraying alkali tower, the alkali spraying tower lower end is provided with a cone bucket, and the bottom of the cone bucket is provided with a drainage device; the side wall of the alkali spraying tower bottom is provided with There is an air inlet, and an air outlet is provided on the top of the alkali spraying tower, and the air outlet is connected with an outlet pipe; it is characterized in that: inside the alkali spraying tower and on the upper side of the air inlet, alkali spraying devices and spraying devices are arranged at intervals from bottom to top. A water device and a packing dehydration device; the air inlet is connected with an air inlet pipe, and a spray device is arranged in the air inlet pipe. 2. blast furnace gas alkali spraying chlorine removal device as claimed in claim 1, is characterized in that: described alkali spraying device, water spraying device are respectively made of a plurality of spray guns surrounding the side wall of alkali spraying tower, and each spray gun is made of spraying gun The outside of the alkali tower runs through the side wall and points to the center of the alkali spray tower. 3. The blast furnace gas alkali spraying chlorine removal device according to claim 2, characterized in that: the spray guns include a plurality of short spray guns, a plurality of long spray guns and a plurality of medium-length spray guns. 4. The blast furnace gas alkali spraying and dechlorination device according to claim 3, characterized in that: the multiple short spray guns, multiple long spray guns and multiple medium-length spray guns are respectively evenly distributed around the side wall of the alkali spray tower. 5. The blast furnace gas alkali spraying chlorine removal device according to claim 2, characterized in that: the spray gun is provided with a plurality of nozzles downward. 6. The blast furnace gas alkali spraying chlorine removal device according to claim 1, characterized in that: a packing flushing device is also provided above the packing dehydration device. 7. The blast furnace gas alkali spraying chlorine removal device according to claim 6, characterized in that: the packing flushing device is composed of an annular spray gun. 8. The blast furnace gas alkali spraying chlorine removal device according to claim 1, characterized in that: a release valve is provided on the gas outlet pipeline and near the gas outlet. 9. The blast furnace gas alkali spraying chlorine removal device as claimed in claim 1, characterized in that: a water pool is provided under the alkali spraying tower.

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