KR960009099Y1 - Dry collecting apparatus of dust and waste gas - Google Patents

Abstract

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Description

Hazardous Gas and Dust Treatment Dry Dust Collector Using Neutralizer

1 is a cross-sectional view of a noxious gas and dust treatment dry dust collecting apparatus using a neutralizing agent (calcified lime) according to the present invention.

* Explanation of symbols for main parts of the drawings

1: Vortex Brower 2: Slaked lime storage tank

3: rotary valve 4: venturi tube

5: slaked lime transfer pipe 6: slaked lime injection pipe

7: Exhaust gas inlet Doc 8: Eject pipe

9: water feed pipe 10: water feed metering pump

11: water storage tank 12: diffusion chamber (gas and slaked lime)

13: Reaction 1st fixed wing 14: 2nd fixed wing

15: Vortex room (mixed room) 16: 3rd fixed wing

17 reaction part 18 separation part

19: Hopper 20: Rotary Valve

21: recovery dust storage tank 22: discharge duct

23: exhaust gas transfer doctor 24: filter dust collecting facility

25: blower

The present invention relates to a noxious gas and dust treatment dry dust collecting facility using a neutralizing agent (slaked lime) among dust collecting facilities for purifying the noxious gas and dust generated in the industrial discharge facility (production equipment and machinery).

Currently, the treatment methods mainly used to purify the harmful gas and dust generated by the industry are classified as follows according to the input method of the neutralizer.

There are three methods of treatment: wet method, dry method and semi-dry method. The method of the device of the present invention is a method of treating the gas (harmful gas contained in the exhaust gas) with a high treatment effect (reaction efficiency) and no waste water generation. Since it is intended to select a method that does not generate a reaction solution (waste solution or waste water) after the reaction, the description of the conventional method of the wet method is omitted.

The dry method is a method of inducing a reaction by directly adding a neutralizing agent to a source, and a method of injecting slaked lime (neutralizing agent) into a duct in which gas flows. The method of injecting is used.

Such a method is required to treat harmful gases such as hydrogen chloride (Hcl), sulfur oxides (Sox), and fluorine compounds (HF) contained in the discharge facility. Therefore, the reactants (neutralizing agents) are calcium carbonate (CaCo3) and calcium hydroxide (Ca). (OH) 2), sodium hydroxide (NA2Co3), calcium oxide (CaO), magnesium carbonate, calcium (CaCo3, MgCo3), etc. are used, but since sodium hydroxide and sodium carbonate are expensive, use as a neutralizing agent is difficult due to excessive operating costs and is common. As a neutralizing agent used in most cases, inexpensive slaked lime, namely calcium hydroxide (Ca (OH) 2), is used.

The chemical equations are as follows.

Ca (OH) 2 + 2Hcl → CaCL2 + 2H2O

Ca (OH) 2 + SO2 → CaSo3 + H2O

Ca (OH) 2 + 2HF → CaF2 + 2H2O

Neutralizer addition and reaction of dry and semi-dry methods put slaked lime into the tube to contact the gas, and the slaked lime can be deposited on the surface of the wheel bag without recovering the natural reaction and unreacted slaked lime reacted in the process of exhaust gas and slaked lime. Attached to induce dust filtration and secondary reactions as the exhaust gas passes through (filters) the wheelbag surface.

In the process of inducing the secondary reaction, since the neutralizer (calcined lime powder) and dust adhere to and deposit on the surface of the wheel bag, the dust loading rate of the wheel bag surface of the filter bag (back filter), which is a prevention facility, increases.

As a result, the exhaust gas becomes a factor of sudden pressure increase when passing through the wheel bag.

Therefore, the filter area of the wheel bag should be lowered to reduce the filtration speed for dust recovery efficiency and pressure correction, resulting in a large dust collector and a large blower power due to the pressure-compensating blower. Is generated.

In addition, in the dry method, slaked lime does not react well with gases such as hydrogen chloride (Hcl), sulfur oxides (So2), and fluorine compounds (HF). Therefore, in order to satisfy the reaction conditions of slaked lime and noxious gases (Duct passing rate ) It has to maintain the speed, and it takes about 4 ~ 5 times the normal reaction amount when slaked lime is input.

The semi-dry method sprays slaked lime in the sludge state, resulting in operational problems such as clogging of nozzles, sticking in the device, complexity of the structure, and excessive maintenance costs, and without directly recovering the sprayed slaked lime. It is accompanied by the problem of dry method that occurs.

To solve this problem, the present invention

1.Gas and dust from incineration of garbage

2.Gas and dust generated when burning combustion such as oil

3.In gas and dust generated during chemical reaction

When gas treatment is carried out by using slaked lime in the exhaust gas containing pollutants without using water and neutralizing liquid to remove pollutants (harmful gases), and to the exhaust gas containing dust and reacted neutralizing substances (slaked lime) particulate matter. After centrifugal force, the particulate matter is separated and recovered by the rotational force, and then the exhaust gas is transferred to a filter dust collector (back filter) to treat only residual dust.

It is a facility that completely handles harmful gases at the same time as dust treatment, and generates no waste water when treating harmful gases, improves the reaction efficiency with harmful gases, and also causes problems due to the input of slaked lime. The filtration rate can be properly adjusted by reducing the increase in the dust load rate of the filter bag generated due to the inflow.

Therefore, it is possible to expect higher treatment effect (filtration and reaction efficiency) than the existing methods, and it can be operated at low operating cost by extending the life of wheel bag and reducing the input of chemicals (slaked lime) by preventing the rupture of the wheel. And savings in investment costs.

This will be described in detail based on the drawings.

After connecting the rotary valve (3) to the lower portion of the slaked lime service tank (2) attaches the venturi tube (4) and connects the vortex blower (1) to the venturi tube (4).

After installing the slaked lime transport pipe (5) to the venturi pipe (4) and connect it to the upper part of the eject (8) inside the inlet duct (7).

Attach the slaked lime spray pipe (6) to the end of the slaked lime feed pipe (5).

Connect the eject pipe (8) to the lower portion of the exhaust gas inlet duct (7) and the water inlet pipe (9) in the middle of the eject pipe (8).

The water inlet pipe 9 is connected to the urine water storage tank 11 and the water transfer metering pump 10.

After connecting the gas and the slaked lime diffusion part 12 to the lower part of the ejection pipe 8, the reaction part 17 is bonded.

Inside the reaction unit 17, the first fixed blade (guide blade) 13 is installed and the second fixed blade 14 is attached to the lower portion of the primary fixed blade (guide blade) 15 at a lower distance. do.

The wing direction of the primary fixed blade (guide feather) 13 and the secondary fixed wing (guide feather) 14 is installed in the opposite direction.

A space is formed between the primary stator blade 13 and the secondary stator blade 14 to create a vortex chamber (mixing chamber) 15.

At the bottom of the secondary stator blade 14, a separation chamber 18 is placed to help the dust and neutralizer escape.

In the separation chamber 18, a gas outlet pipe 22, a third fixed wing 16, and a hopper 19 are installed below the body, and a rotary valve 20 is installed.

After connecting the duct 23 for transporting the treated exhaust gas to the exhaust gas outlet 22, the exhaust gas duct 23 is connected to the filtration so that the treated exhaust gas is connected to the facility (back wheel) 24 by filtration. It is a structure that is connected to the lower part of the facility (back wheel).

Referring to the operation and effect of the device designed as described above is as follows.

In the exhaust gas inlet (7), the slaked lime stored in the slaked lime storage tank (1) is quantified by a rotary valve (3) connected to the lower part while the exhaust gas (containing dust and gas) transported by the duct connected to the discharge facility is sucked in. The venturi plate 4 is supplied to the venturi plate 4, and the high pressure air generated by the vortex blower 1 is transferred to the venturi plate 4 through the rotary valve 3 in the storage tank 1 through the rotary valve 3 according to the pressure in the pipe and the speed of the air. ), The slaked lime injected through the transfer pipe 5 is injected into the upper part of the eject pipe 8.

At this time, the high-pressure air and the slaked lime sprayed on the upper part of the eject pipe 8 pass through the inside of the eject pipe 8 at high speed (25 m / sec to 35 m / sec), and are diffused finely from the diffusion part 12 and discharged. Contaminants (gas) in the gas are reacted by contact.

The contact surface area is 3 to 5 times larger than before due to diffusion atomization, which greatly increases the reaction efficiency between slaked lime and contaminants.

In addition, since the pressure in the pipe is lowered by the speed at which the discharge gas passes through the ejection pipe 8 in the water injection nozzle 9 installed at the intermediate part of the ejection, a Bernoulli phenomenon occurs and water is automatically injected into the pipeline.

The water sprayed from the ejection pipe 8 is absorbed by the slaked lime to accelerate the reaction with the noxious gas. It is necessary to install a high-pressure device by double nozzle in order to inject low-reaction efficiency and excessively water-containing (sludged) lime when injecting pure lime in pure particles. In order to eliminate the problems caused by the introduction of the slaked lime in the sludge state, a metering pump 10 is installed to adjust the amount of water input, and water is separately introduced into the apparatus by the pressure difference due to the passage speed.

The first fixed blade (guide feather) 13 is installed at the upper end of the reaction part 17 to deform the direction of the discharged gas flowing at high speed, thereby forming airflow in the inward direction of the reaction part 17 and installing the lower part. A strong vortex is generated while colliding with the stationary blade (guide feather) 14 to obtain an effect of stirring and mixing the exhaust gas and contaminants by the vortex phenomenon, thereby accelerating the reaction.

The wing direction of the secondary fixed blade (guide feather) 14 is installed in the direction opposite to the wing direction of the primary fixed blade (guide feather) 13 to induce vortex phenomena in the mixing section 14 between the wings. After that, change the direction of rotation again. In addition, in order to accelerate this, the third fixed blade 16 installed in the separation chamber 18 is installed at the same direction and angle as the direction of the secondary fixed blade 14 to form a stronger rotary airflow, which is one of the centrifugal force dust collection facilities. Maintains the axial inverted cyclone shape, so that the effect of separation and separation of slaked lime powder and dust reacted with harmful gas by particle size and specific gravity can be obtained.

This is because waste lime powder injected from the upper side is waste that reacted with contaminants in the first and second stages, so that the lime powder and gas (clean gas) are separated and separated by the specific gravity of the powder. Inflow to (24).

The separated clean exhaust gas is transported to the back wheel dust collector 24 to remove residual dust, and then discharged to the atmosphere through the blower 25.

Therefore, by quickly selecting the filtration speed, the size of the back wheel dust collector 24 is reduced, the life of the back wheel tire is extended, and the pressure loss is reduced, thereby reducing the overall cost of installing the facility such as operating cost, installation cost, and installation area, and gas treatment. There is no wastewater generated by the increase and the filtration efficiency can be maximized to prevent environmental pollution.

As described above, the apparatus of the present invention passes the gas introduced from the slaked lime and the exhaust gas inlet duct 7 which are injected at high pressure from the slaked lime injection pipe 6 at high speed through the ejection pipe 8 so that the water transfer pipe 9 is provided. ), And transfers only the required flow rate by the metering pump 10 and then naturally injects water into the pipe to diffuse the gas introduced from the slaked lime injected from the slaked lime injection pipe 6 and the exhaust gas inlet duct 7. ) To smooth the reaction by the diffusion in the inner direction by the first fixed blade (guide feather) 13, the gas flowing at a high speed flows into the mixing chamber 15, the secondary fixed blade (guide feather) ( 14) and a vortex phenomenon occurs in the mixing chamber 15 due to the change of direction of the airflow.

Accordingly, the exhaust gas reacts with the sintering lime as a neutralizing agent (airflow formation effect due to installation in the opposite direction of the primary and secondary guide vanes), thereby reducing the input amount of the slaked lime and greatly improving the reaction efficiency of the gas.

Also, the reacted slaked lime was installed with a third fixed blade (guide feather) 16 to increase the filtration speed of the back filter 24 before flowing into the bag filter 24. This is the principle of the axial inverted cyclone dust collector, which is one of the centrifugal force dust collectors, and the efficiency of the centrifugal force dust collector can be obtained. When the exhaust gas passes through the 3rd fixed blade (guide blade) 16, dust and gas are separated from the slaked lime reacted by the specific gravity difference by the centrifugal force generated by the speed and the wing direction, and then dropped to the bottom. Separate first.

The separated reaction lime is discharged from the reaction facility by the rotary valve 20, and the clean gas from which noxious gas is removed by the reaction passes through the discharge duct 23 in the form of semi-air flow, and is a secondary dust collector, a back wheel dust collector. Transfer to (24).

The present invention can install a dry back wheel dust collector that can freely select and install back wheel tires and reduce operating costs, and there is no cost of treating waste water treatment facilities and waste water generated when treating gas, It can shorten the lifespan due to corrosion of secondary prevention facilities, select materials, and eliminate the problems, thereby reducing the installation cost. Also, the explosion phenomenon due to the increase of wheel bag dust load rate and the inflow of harmful gas and It is a device that can reduce the cost of selection, and also have a practical effect in businesses in the region (Law on Land Use) that cannot install wastewater discharge facilities.

Claims (4)

In the dry dust precipitator where neutralizing agent (calcined lime) is introduced to purify harmful gas and dust, the ejection pipe (8) is sprayed with a water supplying facility (9) and slaked lime at a high pressure to react with the ejection tube (8) for primary diffusion. Attach the primary fixed blade (guide feather) 13 and the secondary fixed wing (guide feather) 14 inside the unit 17 to accelerate the neutralizer (calcite lime) reaction, and then the third fixed blade (guide feather) ( 16) Dry dust collector to separate by installing. The dry dust collecting device according to claim 1, wherein the blade directions of the primary fixed blade (guide blade) (13) and the secondary fixed blade (guide blade) (14) are installed in opposite directions. The dry dust collecting device according to claim 1, wherein a mixing chamber (15) is formed with a space between the primary fixed blade (guide blade) (13) and the secondary fixed blade (guide blade) (14). The dry dust collecting device according to claim 1, wherein a separation chamber (18) is formed by providing a space between the secondary fixed blade (guide blade) (14) and the third fixed blade (guide blade) (16).