KR20040009257A - An apparatus for processing the slag granulation of blast furnace without steam - Google Patents

Abstract

PURPOSE: A slag granulation apparatus without steam is provided to suppress generation of steam to the maximum extent by condensing steam, recycle the condensate water by circulating steam condensed condensate water into cooling water and prevent air and water pollution by suppressing generation of noxious gases. CONSTITUTION: In a slag granulating apparatus comprising a stack(7) through which slag is vented, a dehydrating tank(3) into which slag granulated by cooling water sprayed into agitation tank(7a) of the stack is supplied, a water supply tank(4) in which water separated from the dehydrating tank is stored, and a cooling tower(5) for cooling water of the water supply tank so that cooling water cooled in the cooling tower is circulated into the agitation tank, the apparatus(1) comprises a spray nozzle(10) fixed to an upper part of space of the stack to spray cooling water downward, thus cooling steam generated in the stack; a catchment tank(20) installed between the spray nozzle and the agitation tank to catch condensate water condensed after steam of the stack is heat exchanged with cooling spray water; a hot water tank(30) connected to the catchment tank to store condensate water of high temperature caught in the catchment tank; and a condensate water cooling tower(40) for cooling the high temperature condensate water to a certain temperature or less by receiving high temperature condensate water stored in the hot water tank so that cooling water is circulated to the side of the spray nozzle.

Description

AN APPARATUS FOR PROCESSING THE SLAG GRANULATION OF BLAST FURNACE WITHOUT STEAM}

The present invention relates to an apparatus for treating steam from slag of a blast furnace with no steam. More specifically, the present invention relates to steam and harmful gas generated during the process of rehydrating hot slag generated from a blast furnace facility as cooling water. By spraying a large amount of sprayed water into the stack to collect and recycling it, the water vapor and harmful gases are prevented from being released to the outside to prevent corrosion of the surrounding equipment, and greatly improved to prevent environmental pollution due to odor. It relates to a steam treatment apparatus.

In general, slag is incidentally generated in the steelmaking process of steel mills, and there are two methods of treating the slag.

The first method is to make slag sand in dry pit, and the second method is to make slag sand in the water equipment. The method of making slag to water is economical rather than to make slag sand. In most cases, due to the capacity limitations of the installation, the treatment of mixed and lumber is carried out.

Explaining the generation process of steam and the generation of hydrogen sulfide in the water facilities as follows.

First, as shown in Figure 1, the slag (slag) of the high temperature molten state generated in the blast furnace (F) is a stirring tank which is a lower space of the stack (7) having a constant height through the hot water and the blowing chamber (6) It is supplied into the (7a), wherein the slag supplied into the stirring tank (7a) is evenly sprayed with cooling water to cool, pulverize and solidify to make the water.

Here, the cleaning chamber 6 is a casing 6a provided in the falling portion of the ballway R through which the slag of the blast furnace F is discharged as shown in Figs. 2 (a) (b) (c). ) And cooling water supplied to the feeding pipe 6b and the feeding pipe 6b installed in the casing 6a so as to supply the slag guided out of the water supply R into the stirring vessel 7a of the stack 7. It consists of the spray ring 6c which has several nozzle 6e, 6f, and the sprayhead 6d so that supply.

Then, the slag reclaimed by the cooling water stays in the lower portion of the stirring tank 7a for a predetermined time, and is then sent to the dehydrating tank 3 by the slurry pump 2 through a pipe, and the dehydrating tank 3 Reclaimed slag from the water is transported to the required place by a transport facility (T), such as a truck disposed in the lower space of the dewatering tank (3), the remaining water separated from the dewatering tank (3) It is supplied to the water supply tank 4 through the external pipe of the temporary storage. Subsequently, the water in the water supply tank 4 is supplied to the cooling tower 5 by the supply pump 2a, and the cooling water, which is water cooled to a predetermined temperature in the cooling tower 5, is separately separated by the circulation pump 2b. It is sent to the spray ring 6c and the spray head 6d of the blowing chamber 6 through piping, and is circulated and supplied to the process of rehydrating the slag of the said stirring tank 7a.

However, a large amount of water vapor is generated in the process of rehydrating while cooling the slag with cooling water in the stirring tank 7a, which is the lower part of the stack 7, and also, hydrogen sulfide (H) that corrodes the peripheral equipment and adversely affects the human body. ₂ S), a gas containing sulfur components such as sulfur dioxide (SO ₂ ) was generated.

That is, the mixed gas containing water vapor and sulfur components emitted from the upper part of the stack 7 into the atmosphere is very corrosive, thereby prematurely corroding the surrounding equipment, and hydrogen sulfide is a typical odor generating substance having an egg rotting odor. There was a problem causing bad smell around.

Therefore, the present invention has been proposed to solve the conventional problems as described above, the object is to condense the water vapor generated in the water stack to suppress the generation of water vapor as much as possible, circulating the condensed water condensed water vapor in the cooling water reuse On the other hand, it is to provide a blast-furnace-free steam treatment apparatus that can prevent the pollution of the air and water environment by inhibiting the generation of harmful gases that corrode the facility, adversely affecting the human body, causing odor.

1 is a configuration diagram showing a process of re-watering slag in a typical blast furnace equipment,

FIG. 2 illustrates a drawing room of a facility for reclaiming slag in a general blast furnace facility.

a) is the overall configuration of the report room,

b) cross section of spraying,

c) is a cross-sectional view of the sprayhead,

3 is a configuration diagram showing a steamless apparatus for blast furnace material according to the present invention;

Figure 4 is an overall configuration diagram showing the reinforcement facility employing the blast furnace reinforcement steam treatment apparatus according to the present invention,

Figure 5 is a flow chart showing the flow of water in the blast furnace material steam treatment apparatus according to the present invention,

Figure 6 is a block diagram showing an explosive opening employed in the blast furnace material steam treatment apparatus according to the present invention.

Explanation of symbols on the main parts of the drawings

3 ..... Dewatering Tank 4 ..... Water Tank

5 ..... Cooling Tower 7 ..... Stack

7a .... Agitator 10 .... Spray nozzle

20 .... sump 30 ....

40 .... condensate cooling tower 50 .... explosion

As a technical configuration for achieving the above object, the present invention,

The stack into which the slag is introduced from the blast furnace, the dewatering tank to which the slag rehydrated by the cooling water injected into the stirring tank of the stack is supplied, the water tank to store the water separated from the dewatering tank, and the water of the water supply tank. An apparatus for cooling a slag to reclaim a slag by cooling in a cooling tower and circulating the cooling water cooled in the cooling tower into the stirring vessel.

A sprinkling nozzle fixedly installed at an upper portion of the stack inner space to cool water vapor generated in the stack, and spraying the cooling sprayed water downward;

A water collection tank installed in the water spray nozzle and the stirring irradiator to collect the condensed water condensed by heat-exchanging water vapor and cooling spray water of the stack;

A hot water tank connected to the water collecting tank so as to store the hot condensed water collected in the water collecting tank; And

The condensate cooling tower receiving the high temperature condensed water stored in the hot water tank to circulate the cooling water to the water spray nozzle side and cooling the temperature below a predetermined temperature.

Figure 3 is a block diagram showing a steam-free processing apparatus for blast furnace material according to the present invention, Figure 4 is an overall configuration diagram showing a water treatment equipment employing a steam-free processing apparatus of blast furnace material according to the present invention, Figure 5 Is a flow chart showing the flow of water in the blast furnace ash vapor treatment apparatus according to the present invention, Figure 6 is a block diagram showing the explosion port employed in the blast furnace ash vapor treatment apparatus according to the present invention.

The apparatus 1 of the present invention, as shown in Figures 3 to 6, in the process of re-watering the slag by spraying the cooling water into the stirring tank (7a) of the stack (7) in which the slag of the blast furnace (F) flows in By preventing a large amount of water vapor and harmful gas generated into the atmosphere to prevent corrosion and air pollution of the surrounding equipment, such a device (1) is a spraying nozzle (10), a collecting tank (20), a hot water tank ( 30) and the condensate cooling tower 40 and the like.

That is, the spraying nozzle 10 is provided with at least one or more cooling water supply pipe 12 is fixed to the upper portion of the inner space of the stack (7) and the sprayed water cooled to a predetermined temperature below 40 ℃ the stack (7) Cooling water supply pipe 12 is sprayed downward from the upper portion of the inner space, the cooling water supply pipe 12 in which the spraying nozzle 10 is installed, one end is connected to the cooling tower 40 to facilitate replacement and repair The other end of the member 83 is connected via a flange.

In addition, the water collecting tank 20 is the spraying nozzle 10 and the stirring tank to collect the hot condensate heat exchanged with the high temperature steam generated during the rehydration process of the slag made in the stirring tank (7a) of the stack (7) It is fixedly installed at the position corresponding to (7a). The water collecting tank 20 has a structure in which the inlet is narrowed from the upper portion to the lower portion so as to easily collect the condensate, and the lower end is configured to communicate with the piping member 81 so as to discharge the hot condensate to the outside.

In addition, the hot water tank 30 is a storage tank having an internal space of a predetermined size to collect and store the high temperature condensed water collected in the water collecting tank 20, and through the water collecting tank 20 and the piping member 81. And a level gauge 35 for detecting the water level is provided. The hot water tank 30 is lower than the installation position of the sump 20 so that the external discharge of the condensate from the sump 20 connected in communication via the pipe member 81 is easily made by its own weight without a separate power source It is good to be installed in the place.

On the other hand, the condensate cooling tower 40 is connected via a pipe member 82 so as to receive a high-temperature condensate stored temporarily in the hot water tank 30, the inside of a predetermined size to store a certain amount of condensate It is a storage tank having a space, and is provided with a level gauge (45) for measuring the water level change, the piping member 82 at least one to smoothly supply the condensed water in the hot water tank 30 into the condensate cooling tower 40 The above pump member 31 is provided. The condensate of high temperature supplied into the condensate cooling tower 40 is cooled to a temperature below 40 ° C. so as to be recycled into a cooling jet water capable of cooling the high temperature steam generated during the rehydration of the slag.

Here, the upper part of the condensate cooling tower 40, the cooling fan 41 and the fan motor 42 to rotate the driving fan in one direction so as to increase the cooling rate of the high temperature condensate supplied from the hot water tank 30 into the condensate cooling tower 40. ) May be provided.

In addition, between the condensate cooling tower 40 and the water supply tank 5 combines Ca ₄ contained in the water of the water supply tank 5 and SO ₄ contained in the cooling condensate of the condensate cooling tower 40 to generate CaSO ₄ . Piping member for supplying the cooling condensate in the condensate cooling tower 40 into the water supply tank 5 so as to prevent the continuous absorption of sulfur components in the circulating coolant without neutralizing equipment, and to neutralize the circulating coolant. 84) and the pump member 73 is configured to smoothly supply the cooling condensed water to the piping member 84.

In addition, the water supply tank 4 is configured to communicate with a pipe member 85 having a pump member 74 to circulate the circulating water from which the sulfur component is removed into the hot water tank 30.

In addition, the outer surface of the upper end of the stack 7 circulates and condenses the high temperature water vapor which is not heat-exchanged with the cooling water in the inner space of the stack 7 into the stirring tank 7a of the stack 7. The other end of the circulation pipe 86, one end of which is connected to the stirring tank 7a, is installed in communication.

On the other hand, the casing (6a) of the blowing chamber (6) for supplying the slag of the blast furnace (F) into the stirring tank (7a) of the stack (7) and the water (1520 ℃ or more contained in the slag and the water reacts with the stack ( The internal pressure of the 7) is excessively increased and comprises an explosion port 50 to prevent the stack 7 to be exploded, the explosion port 50 is connected to the upper end of the casing (6a) in communication The upper casing of the explosion casing 53 and the upper casing of the explosion casing 53 are normally sealed by a buffer cover 51 which is assembled to be opened and closed via a hinge pin on one side of the upper end of the explosion casing 53, and the weight of the explosion casing 53. The weight 54 is installed on the shock absorbing cover 51 to open the upper opening of the casing 53 when the internal pressure of the explosion increases excessively.

In addition, the upper end of the stack 7 is mixed with hot waste water and coolant to explode the high temperature in the stack 7 to protect the stack 7 when the water vapor pressure in the stack 7 becomes excessively high. It comprises a steam relief flap (60) capable of discharging water vapor to the outside.

The operation and effects of the present invention having the configuration as described above will be described.

Re-processing the slag generated during the process of manufacturing the molten iron in the blast furnace equipment is about 1530 ℃ slag from the blast furnace (F) to the stirring tank (7) of the stack (7) through the tap (R), feeding pipe (6b) The hot slag and water are mixed by spraying water through the spray ring 6c and the spray head 6d provided at the inlet end of the feeding pipe 6b while feeding into 7a).

During the slag rehydration process, high temperature water vapor is generated, and the generated water vapor rises to the upper part of the stack. At this time, the spraying nozzle 10 installed on the top of the stack 7 having a closed structure to prevent the external discharge of water vapor is difficult. When down-spraying the cooling jet water having a temperature of about 40 ° C. through), high temperature water vapor and noxious gases meet with the low temperature cooling water jet and react with each other to exchange heat to react to generate condensed water.

At this time, looking at the reaction of the water vapor, harmful gas and cooling sprayed water in the stack (7),

H ₂ S + H ₂ O → H ₂ SO ₃

SO ₂ + H ₂ O → H ₂ SO ₃

SO ₂ + ½0 ₂ → SO ₃

SO ₃ + H ₂ O → H ₂ SO ₄

H ₂ SO ₃ + H ₂ O → H ₂ SO ₄

H ₂ S + SO ₂ → H ₂ O + S ↓

The condensate generated in the stack 7 may include H ₂ SO ₃ , H ₂ SO ₄ , and S components.

And, looking at the reaction of the CaO component and water (H ₂ O) contained in the slag in the stirring tank (7a),

CaO + H ₂ O → Ca (OH) ₂ + H ₂ O

CaO in the slag component and the injected water react with each other by a reaction scheme such as an alkaline solution such as Ca (OH) ₂ to be included in the regenerated slag.

Subsequently, the condensed water having a temperature of 60 to 100 ° C. generated in the stack 7 is collected in the collection tank 20 and then continuously supplied into the hot water tank 30 through the piping member 81 and temporarily stored. .

At this time, looking at the chemical reaction made in the condensed water supplied from the sump tank 20 to the hot water tank 30,

SO ₂ + Ca (OH) ₂ → CaSO ₃ + H ₂ O

CaSO ₃ + ½0 ₂ → CaSO ₄ ↓

The condensate is circulated with CaSO ₄ by the reaction scheme.

In addition, the condensed water of the hot water tank 30 is circulated and supplied to the condensed water cooling tower 40 when the pump member 73 of the piping member 82 connected thereto, and the condensed water of the condensed water cooling tower 40 is a cooling fan 41. It is cooled to around 40 ° C so that it can be reused as cooling spray water.

In addition, the cooling water cooled in the condensate cooling tower 40 is supplied to the water spray nozzle 10 through the pipe member 83 by the operation of the pump member 72 to condense the water vapor generated in the stack 7. To be reused.

Here, by installing the level gauges 35 and 45 respectively measuring the level of the condensate in the hot water tank 30 and the condensate cooling tower 40, the water level of the hot water tank 30 is high or the condensate cooling tower ( When the water level of the 40 is low, the pump members 71, 72, 73 installed in the respective piping members 82, 83, 84 are operated to circulate the condensed water filled in the hot water tank 30, For example, when a low signal is detected in the hot water tank 30 or a high signal is detected in the condensate cooling tower 40, the pumping operation of circulating condensate is automatically stopped.

Meanwhile, some cooling condensed water in the condensate cooling tower 40 is supplied through the piping member 84 into the water supply tank 4 in which the water separated in the dehydration tank 3 is supplied and stored, wherein the water supply tank 4 Looking at the reaction of the rear end of the) and the rear end of the hot water tank 30,

H ₂ SO ₄ + Ca (OH) ₂ → CaSO ₄ ↓ + H ₂ O

CaSO ₄ continues to be precipitated and circulated with water by the chemical formula such as.

Here, the CaSO ₄ is the smallest particles, the affinity for binding particles is superior to the force attached to the pipe, there is no fear of clogging of the pipe, it is not ionized again in the water and continuously united in a crystalline state like reclaimed slag Externally discharged.

Further, since the condensed water to be supplied into the hot water tank 30 is of an acidic solution comprising H ₂ SO _4, stirred In this condensate into the feed water tank 4 by an alkaline solution of Ca (OH) _{2 O} with mixing chamber It is possible to manage the PH value of the cooling water re-supplied into (7a) close to neutral (PH7).

In addition, one end of the remaining steam which is not vaporized in the internal space of the stack 7 is connected to the top outer surface of the stack 7, and the other end of the circulation pipe 86 is connected to the stirring tank 7a. Recondensation in the stack (7).

According to the present invention as described above, the injection water is condensed by spraying the injection water so that water vapor and harmful gas generated in the process of re-processing the slag of the blast furnace is not discharged to the outside of the stack, to collect the harmful gas and at the same time By circulating and reusing, it is possible to reduce the industrial water to prevent corrosion of the surrounding equipment, and to prevent air pollution due to odors.

While the invention has been shown and described with respect to specific embodiments thereof, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit or scope of the invention as set forth in the claims below. I would like to clarify that knowledge is easy to know.

Claims (7)

The stack into which the slag is introduced from the blast furnace, the dewatering tank to which the slag rehydrated by the cooling water injected into the stirring tank of the stack is supplied, the water tank to store the water separated from the dewatering tank, and the water of the water supply tank. An apparatus for cooling a slag to reclaim a slag by cooling in a cooling tower and circulating the cooling water cooled in the cooling tower into the stirring vessel. A sprinkling nozzle fixedly installed at an upper portion of the stack inner space to cool water vapor generated in the stack, and spraying the cooling sprayed water downward; A water collection tank installed in the water spray nozzle and the stirring irradiator to collect the condensed water condensed by heat-exchanging water vapor and cooling spray water of the stack; A hot water tank connected to the water collecting tank so as to store the hot condensed water collected in the water collecting tank; And And a condensate cooling tower receiving high temperature condensed water stored in the hot water tank to circulate and supply cooling water to the water spray nozzle. The apparatus of claim 1, wherein the hot water tank is installed at a position lower than an installation position of the water collecting tank so that external discharge of condensed water from the water collecting tank is easily performed by its own weight. The blast furnace material according to claim 1, further comprising: a cooling fan and a fan motor configured to rotate the unidirectional rotating drive in the upper portion of the condensate cooling tower to increase the cooling rate of the hot condensate supplied from the hot water tank into the condensate cooling tower. Vapor treatment equipment. The condensate cooling system of claim 1, wherein the condensate cooling tower and the water supply probe combine SO ₄ included in the cooling water of the condensate cooling tower with Ca ions included in the water of the water supply tank to generate CaSO ₄ and neutralize the circulating water. A blast furnace material steam treatment apparatus comprising a piping member for supplying cooling water of a cooling tower into the water supply tank. The apparatus of claim 1, wherein the water supply tank communicates with the pipe member so as to circulate and supply the circulating water from which the sulfur component is removed into the hot water tank. The blast furnace material according to claim 1, wherein the stack and the stirring chamber are provided with a circulating pipe communicating with the stack to recondense the high temperature water vapor in which the heat is not exchanged with the cooling jet water in the stack. Vapor treatment equipment. The method of claim 1, The casing of the blowing chamber for supplying slag into the stirring vessel of the stack is provided with an explosive opening for preventing the stack from being exploded due to excessive increase in the internal pressure of the stack, and the explosive opening communicates with an upper end of the casing. The upper casing of the explosion casing, the buffer cover which is assembled to be opened and closed via a hinge pin on one side of the upper end of the explosion casing, and the self-weight of the explosion casing, and the casing of the casing when the internal pressure of the explosion increases excessively. Blast furnace free steam treatment apparatus, characterized in that consisting of a weight installed on the buffer cover to open the upper opening.