Treatment process involving removal of chlorine and hydrogen chloride and relevant apparatus

FIELD: gas treatment processes.

SUBSTANCE: invention relates to nonferrous metallurgy, in particular to treating emission gases to remove chlorine and hydrogen chloride in titanium and magnesium production processes. Process comprises feeding gases from below into gas cleaner casing, feeding liquid in the form of lime milk in countercurrent to gas travel, circulation of liquid, and subsequent discharge of the spent solution out of circulation system and withdrawal of gases. Process involves swirling gases and feeding them into plate member of swirler, interaction of liquid with gases to form gas-liquid emulsion, separating gas-liquid emulsion into liquid and gas by way of passing emulsion through a relevant device. Liquid separated in gas-liquid emulsion separator is collected on casing wall wherefrom it flows down into lower part of casing and is then removed therefrom. Separator is periodically receives water to prevent deposits.

EFFECT: prolonged service time of auxiliary equipment and gas collectors, reduced consumption of reagents (calcium hydroxide and oxide) and raw material, and reduced pollution of waste water with alkali reagents.

4 cl, 2 dwg

 

The invention relates to ferrous metallurgy, in particular for exhaust gas cleaning processes for titanium and magnesium from chlorine and hydrogen chloride.

The known method and device for cleaning gases from chlorine and hydrogen chloride (Ivanov A.I., Landres MB Prokofiev O.V. magnesium Production. M: Metallurgy. - 1979, str-362). The method includes the flow of gases from the bottom of the scrubber prototechno the movement of a liquid, a gas absorption solution of lime (lime milk), which circulate in the system tank scrubber. When reaching a certain concentration of calcium oxide in the solution of the fluid removed from the system and load a new batch. Gases from the scrubber comes in cyclones-britholite, where optionally purified from the liquid and removed to the atmosphere.

Device for cleaning gases from chlorine and hydrogen chloride includes scrubber, two sides of which are placed cyclones-britholite, pumps for liquid transfer and the collection tank.

The disadvantage of this method and devices is their low performance.

The known method of purification of exhaust gases (Ostrich Century Industrial gas cleaning. - M.: Chemistry. in 1981, pagination 126, 140-142, 392-397). The method comprises feeding the liquid at different levels in the absorber, the liquid spray with the formation of drops of a given diameter (1 mm), countercurrent flow of gases from specified the speed and absorption of gases, liquid drops, which circulate in a closed loop absorber-tank. As a liquid use water, milk of lime, ammonia and other absorbents. To maintain a constant liquid level provide makeup water to the tank.

The disadvantage of this method is the high cableone when processing gases drops of diameter less than 1 mm droplets in the process of movement captured solid particles, gases and are removed from the absorber. This entails failure need to set in the process flow of the gas purification after absorber additionally, the eliminator, which complicates the apparatus-technological scheme and creates difficulties in the layout of the existing buildings in terms of existing facilities. In addition, when the purification of aggressive gases increased capital expenditures and operating costs for construction and maintenance of more bulky in the hardware design of the technological scheme. The presence in the circuit eliminator causes additional resistance to the flow of the purified gas of the order of 100-400 PA at inertial and up to 1500 PA at centrifugal types cablewholesale.

The known method and device for purification of exhaust gases (U.S. Pat. Of the Russian Federation No. 2201791, publ. 10.04.2003, bul) the number of General characteristics adopted for the nearest equivalent prototype. The method includes the flow of gases from the bottom in ARPUs of gas and fluid supply prototechno the movement of gases. As the liquid used at the same time the water and the milk of lime, which circulate in the system tank scrubber, with the subsequent withdrawal of the spent solution from the circulation system and the output gases. The device includes a housing, a device for feeding liquid, a nozzle for discharging the liquid, placed in the lower part and connections for input and output gases. The proposed method and the device allow to increase the efficiency of the cleaning process to simplify the adjustment process of trapping liquid droplets when the change in the flow rate of the purified gas, to reduce cableone irrigating fluid.

The disadvantage of these methods and devices is that at high speeds the gas carries along with it a liquid, which leads to increased corrosion of the gas reservoir and auxiliary equipment (smoke exhausters, fans and pumps), and it significantly reduces the life support equipment and gas reservoirs, reduces plant productivity and increases the cost of equipment replacement. The disadvantage is the increased consumption of liquid on the absorption of gases. In addition, the liquid, such as milk of lime used in the cleaning process from chlorine and hydrogen chloride, polluting industrial effluents, and there is a need for further disposal of waste from harmful components.

Those are the technical result is to eliminate the disadvantages of the prototype is to increase the life support equipment and gas reservoir, in reducing the consumption of reagents (CA(Oh)2and Cao) and raw materials of calcium carbonate, reduction of pollution of wastewater alkaline reagents (lime milk).

The technical result is that the method of cleaning gases from chlorine and hydrogen chloride, including the flow of gases from below into the body of the scrubber, the flow of the liquid in the form of lime milk prototechno the movement of gases, liquid circulation with subsequent withdrawal of the spent solution from the circulation system and the output gases, it is new that carry out the twisting gases and feeding them into the swirl, the interaction of fluids and gases with the formation of the gas-liquid emulsion, separation of gas-liquid emulsion in the liquid and the gas by passing it through a device for the separation of gas-liquid emulsion, the liquid serves on the disc element, swirl, separated in device for separating a gas-liquid emulsion liquid collect on the walls of the casing, whence it flows into the lower part of the body, where her away, to a device for the separation of gas-liquid emulsion periodically serves water to prevent it deposits.

In addition, the milk of lime is used with a concentration of 100 g/l of calcium hydroxide.

Moreover, the ratio of lime milk consumption supplied to the interaction with the basics, the quantity of supplied gas is 1:(500-1100) when the density of a solution of 1,12-1,15 g/cm3.

For implementing the method proposed device for cleaning gases from chlorine and hydrogen chloride, comprising a housing, a device for feeding liquid, a nozzle for discharging the liquid, placed in the lower part, and connections for the inlet and outlet gases, it is new that it further comprises a tangential inlet for gas supply, swirl with Poppet element, placed in the annular slit of the housing, a device for the separation of gas-liquid emulsion, made in the form of plates with blades installed with a gap between the walls of the casing, an air deflector and nozzle to supply water, placed over the device for the separation of gas-liquid emulsion while the upper and lower part of the body have different diameter, a device for the separation of liquid and gas is installed in the upper part of the housing and swirl in the lower part of the body.

The implementation of the swirling gases and feeding them into the swirl with the subsequent interaction of fluids and gases with the formation of the gas-liquid emulsion allows to increase the surface interaction of the reactants with each other that leads to an increase in the degree of gas purification from impurities chlorine and hydrogen chloride and thus to reduce chemical consumption reagent is, in particular lime milk.

The separation of gas-liquid emulsion in the liquid and the gas by passing it through a device for the separation of gas-liquid emulsion breaker visor, mounted on the device, reduce the liquid content in gases and thereby to return the portion of the fluid back into the circulation process. The reduction in the content of aggressive liquids in gases reduces corrosion of accessories and accordingly increases the lifetime of the equipment.

The device for separating gas-liquid emulsion in the form of plates with blades allows you to direct the fluid to the wall of the housing, the liquid flow down the sides of the case down device and output from the device. This reduces the cost of additional equipment for the collection of liquid (excluded demisters in the scheme of gas cleaning).

The choice of a specific relationship lime milk consumption supplied to the interaction with gases, the quantity of supplied gases, equal to 1:(500-1100), and the choice of the density of milk of lime solution equal 1,12-1,15 g/cm3reduces fluid - milk of lime - and thereby reduce the cost of its preparation.

The gap between the walls of the casing and a device for separating a gas-liquid emulsion allows you to drip from the walls down at the trojstva.

The claimed group of inventions to meet the requirement of unity of invention, since the claimed method of cleaning gases from chlorine and hydrogen chloride and device for its implementation constitute a single inventive concept.

Conducted by the applicant's analysis of the prior art, including searching by the patent and scientific and technical information sources, and identify sources that contain information about the equivalents of the claimed invention, has allowed to establish that the applicant had not found the source, which is characterized by signs, identical all the essential features of the invention. The definition from the list of identified unique prototype as the most similar set of features analogue has allowed to establish the essential towards perceived by the applicant to the technical result of the distinctive features in the proposed method for cleaning gases from chlorine and hydrogen chloride and the device for its implementation set forth in the claims.

Therefore, the claimed invention meets the condition of "novelty"

To verify compliance of the claimed invention the term "inventive step", the applicant conducted an additional search of the known solutions to identify signs that match the distinctive features of the prototype of the signs Appl the frame of the device and method of its installation. The search found no new sources and declared interest not derived explicitly for the specialist, as in the prior art, a particular applicant identified the influence provided the essential features of the claimed invention transformations to achieve a technical result. Therefore, the claimed invention meets the condition of "inventive step"

Figure 1 shows a device for cleaning gases from chlorine and hydrogen chloride, which consists of a housing 1 made of the upper part 2 and lower part 3 has a cylindrical shape, swirl 4 disc element, the tangential nozzle 5 for supplying gas pipe 6 to exit gases, irrigation pipe 7, the drain pipe 8, the device for separating gas-liquid emulsion 9 made in the form of a plate 10 with blades 11, the bumper of the visor 12, nozzles for supplying liquid 13, the gap 14 between the swirler and the housing, a gap 15 between the device for separating gas-liquid emulsion and the walls of the casing, pipes for water supply 16.

Figure 2 shows a device for the separation of gas-liquid emulsion

The example method and device.

In the manufacturing process of magnesium is formed in a large amount of exhaust gases that the content of chlorine and hydrogen chloride significantly exceed d the permissible sanitary norms. Therefore, these gases before discharge to the atmosphere purified from harmful substances. Exhaust gases composition 6-9 g/m3chlorine and 0.6 g/m3of hydrogen chloride in the amount of 30000-39000 m3per hour and at a temperature of not more than 140°through the lower tangential pipe 5 serves in the lower part 3 of the housing 1 of the device for cleaning gases. The height of 13.5 m, the diameter of 2.3 m, the material - titanium alloy. In case 1, taking the tangential motion, the gases pass into the swirler 4, placed in the lower part 3 of the housing 1. On disc swirl element 4 on the irrigation pipe 7 through a nozzle 13 serves fluid - milk of lime at a concentration of calcium hydroxide 100 g/l and the density of the solution of 1.12 g/cm3and with regard to the consumption of milk of lime to the gases of 1:900. Liquid, breaking into a disc element of the swirler 4, is mixed with the gas, forming gas-liquid emulsion. The process of absorption of chlorine and hydrogen chloride of lime milk flows through the following reactions:

After interaction with chlorine and hydrogen chloride under the influence of centrifugal force, the liquid droplets together with the formed salts are pressed against the walls of the device and losing due to friction velocity, flow down through the gap 14 between the swirler 4, korpusa the 1 in the lower part 3 of the device, and then through the drain pipe 8, the liquid flows into the tank circulation, and where it is recycled (circulated) on the formation of gas-liquid emulsion.

Gas-liquid emulsion after washing in the emulsion layer continues rotational movement in the volume above the swirler 4, passes through the device 9 for additional separation of gas-liquid emulsions on liquid and gas, installed in the upper part 2 of the housing 1. Due to the rotation of the drops of fluid - milk of lime, resulting in the collapse of bubbles at the upper emulsion layer and departing from it, under the action of centrifugal forces are separated on the wall of the housing 1, flow down through the gap 15 down and removed through the drain pipe 8. To prevent deposits on the device for the separation of gas-liquid emulsion periodically to the device through the pipe 16 through a nozzle serves fluid is water. As the absorption of lime milk is lower initial mass concentration of calcium oxide in the absorption solution. So the solution to achieve a concentration of Cao 20 g/m3withdrawn from circulation tanks. In tanks pour fresh milk of lime. The result of the process gas mass concentration of chlorine in the flue gases is reduced to 0.06 g/m3the degree of purification achieved a 99.0-100%.

Thus, proposed is a procedure and a device for cleaning gases from chlorine and hydrogen chloride help to improve the life support equipment and gas reservoir, to reduce the consumption of reagents (CA(Oh)2and Cao) and calcium carbonate to reduce sewage contamination alkaline reagents (lime milk).

1. The method of purification of gases from chlorine and hydrogen chloride, including the flow of gases from below into the body of the scrubber, the flow of the liquid in the form of lime milk prototechno the movement of gases, liquid circulation with subsequent withdrawal of the spent solution from the circulation system and the output gases, characterized in that exercise tightening gases and feeding them into the swirl, the interaction of fluids and gases with the formation of the gas-liquid emulsion, separation of gas-liquid emulsion in the liquid and the gas by passing it through a device for the separation of gas-liquid emulsion, the liquid serves on the disc element, swirl, separated in the device for the separation of gas-liquid emulsion liquid collect on the walls housing, from where it flows into the lower part of the body, where her away, to a device for the separation of gas-liquid emulsion periodically serves water to prevent it deposits.

2. The method according to claim 1, characterized in that the milk of lime is used with a concentration of 100 g/l of calcium hydroxide.

3. The method according to claim 1, characterized in that the ratio of lime milk consumption supplied to the interaction with gases, to which icesto supplied gases is 1:(500-1100) when the density of a solution of 1,12-1,15 g/cm3.

4. Device for cleaning gases from chlorine and hydrogen chloride, comprising a housing, a device for feeding liquid, a nozzle for discharging the liquid, placed in the lower part, and connections for the inlet and outlet gases, characterized in that it further comprises a tangential inlet for gas supply, swirl with Poppet element, placed in the annular slit of the housing, a device for the separation of gas-liquid emulsion, made in the form of plates with blades installed with a gap between the walls of the casing, an air deflector and nozzle to supply water, placed over the device for the separation of gas-liquid emulsion, with the upper and the lower part of the body have different diameter, a device for the separation of liquid and gas is installed in the upper part of the housing and swirl in the lower part of the body.



 

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