KR20150010429A - Toxic Substance Reduction System of Treating Exhaust Gas Having Agitation Part - Google Patents

Abstract

A system to reduce toxic substances of an exhaust gas including a stirring part comprises: a lime tank which receives solid lime; a urea tank which receives solid urea; a filter part formed between an inlet path and an outlet path for the exhaust gas, and includes one or more ceramic filters to remove dust, sulfur oxides, and nitrogen oxides from the exhaust gas; a stirring part which dissolves the solid lime by supplying solvents to the solid lime and the solid urea, and stirring and dissolving the solid urea using a reaction heat generated when the solid lime is dissolved to form a mixture; and a supply part which supplies the mixture to the filter part.

Description

[0001] The present invention relates to a system for reducing toxic substances in exhaust gas,

The present invention relates to a system for reducing harmful substances in an exhaust gas, and more particularly, to a reduction system capable of simultaneously reducing dust, sulfur oxides, and nitric oxides by using a stirring part that stirs solid elements and solid lime.

Recently, environmental regulations for pollutants of exhaust gas generated from engines of ships have been strengthened, and various engine exhaust gas post-treatment technologies and devices have been developed and applied.

In the case of Tier III, which will enter into force in 2016, it is necessary to reduce more than 80% of NOx compared to current tier II, and carbon dioxide, which is a greenhouse gas, will be linked to EEDI (Energy Efficiency Design Index) .

In addition, regulations on sulfur oxides (SOx) are on the increase, and Particulate Matter (PM) is not currently subject to regulation, but this is also under discussion on regulations, .

A typical post-treatment unit for NOx reduction is the SCR (Selective Catalytic Reduction) unit, which is currently being evaluated as the only alternative of the Tier III. Currently, the development of low temperature catalyst technology for application to the main engine is underway.

On the other hand, as described above, the regulations for sulfur oxides are also being strengthened gradually, and the method for reducing sulfur oxides can be roughly divided into two methods.

The first is a semi-dry method using lime (LME) or a wet method using sodium hydroxide (NaOH) as a method of chemically post-treating sulfur oxides, and the second method is a method using fuel itself as a low sulfur fuel. Recently, the use of low-sulfur fuel in ECA (Emission Control Area) has been widely used.

In the case of dust (PM), the DPF (Diesel Particulate Filter) technology already developed in automobiles is widely used. This is because the dust is filtered and accumulated in the DPF, and then a certain amount is accumulated and then the dust is removed through the combustion.

Although each post-treatment device for nitric oxide, sulfur oxide, and dust exists in this way, when each of these devices is separately applied to a ship, there is a problem of cost for establishing the facility, a problem of the installation space, Which is a large burden.

Therefore, a method for solving such problems is required.

Korean Patent No. 10-0999571

The present invention has been devised to solve the problems of the prior art described above, and it is an object of the present invention to provide a method and apparatus for improving efficiency by using solid elements and solid lime, .

The problems of the present invention are not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.

In order to accomplish the above object, the exhaust gas toxicity reduction system of the present invention includes a lime tank in which solid lime is contained, an urea tank in which a solid element is accommodated, an inflow path of the exhaust gas, And a filter part including at least one ceramic filter for removing dust, sulfur oxides and nitric oxide contained in the exhaust gas, a solvent is supplied to the solid lime and the solid element and is stirred to dissolve the solid lime, An agitating part for dissolving the solid element by a reaction heat generated upon dissolution of the solid lime to form a mixture, and a supplying part for supplying the mixture to the filter part.

The supply unit may include a lime oil path connected to the lime tank to flow the solid lime to the agitation unit, and an element flow channel connected to the urea tank to flow the solid element to the agitation unit.

The supply unit may include a supply passage connected to the agitator to flow the mixture.

And the supply section may supply the mixture to the exhaust gas inflow path.

Further, the supply section may supply the mixture to the front end of the ceramic filter.

The stirring unit may include a first heating unit for raising the temperature of the stirring unit.

And a solvent storage unit connected to the stirring unit and supplying the solvent to the stirring unit.

And a sensing sensor for sensing the concentration of sulfur oxides and nitric oxides of the exhaust gas flowing in the outflow path and adjusting the amount of the mixture in the supply portion.

A plurality of filter units may be provided.

And the supply section may supply the mixture to each of the plurality of filter sections.

In addition, the filter unit may be provided with a vibration unit or a compressed air injection unit for removing dust generated on the surface of the ceramic filter.

And a second heating unit for raising the exhaust gas flowing into at least one of the inflow path of the exhaust gas and the filter unit.

In order to solve the above problems, the exhaust gas toxic material reduction system including the agitator of the present invention has the following effects.

First, there is an advantage that the harmful substances included in the exhaust gas can be efficiently reduced at a low cost.

Second, it has the advantage of low cost for installation.

Third, there is an advantage that the volume occupied by the equipment is small.

Fourth, there is an advantage that clogging due to sulfur poisoning does not occur in the filter portion.

Fifth, since the solid element is dissolved by the heat of reaction due to the lime dissolution, there is an advantage that the use of extra energy required for dissolving the solid element can be minimized.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description of the claims.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a configuration of a system for reducing exhaust gas pollutants according to a first embodiment of the present invention; FIG.
FIG. 2 is a view showing a state of the ceramic filter provided in the filter unit in the exhaust gas harmful material reduction system according to the first embodiment of the present invention; FIG.
FIG. 3 is a view showing the configuration of a system for reducing exhaust gas pollutants according to a second embodiment of the present invention; FIG.
FIG. 4 is a view showing the configuration of a system for reducing exhaust gas pollutants according to a third embodiment of the present invention; FIG. And
FIG. 5 is a view showing each configuration of the exhaust gas toxicant reduction system according to the fourth embodiment of the present invention. FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In describing the present embodiment, the same designations and the same reference numerals are used for the same components, and further description thereof will be omitted.

1 is a view showing the configuration of a system for reducing exhaust gas toxic substances according to a first embodiment of the present invention.

1, the exhaust gas toxicant reduction system according to the first embodiment of the present invention includes a lime tank 300, an urea tank 200, a supply unit, a filter unit 100, (250).

The lime tank 300 contains solid lime therein, which can be any of calcium oxide (CaO) and calcium hydroxide (Ca (OH) ₂ ). Inside the urea tank 200, a solid element is accommodated.

The supply unit supplies the mixture of lime and urea, which are agitated by the agitating unit 250, to the filter unit 100. In this embodiment, the feeder may include a feed nozzle 220 for spraying the mixture.

The supply unit may include a lime oil path 310 connected to the lime tank 300 to allow the solid lime to flow to the agitation unit 250, An element flow path 210 to flow to the agitating part 250 and a supply flow path 230 connected to the agitating part 250 to flow the agitated mixture.

That is, the supply section may supply the mixture to the exhaust gas inlet passage 10a, and may supply the mixture to the front side of the ceramic filter 110 inside the filter section 100. [ In this embodiment, the supply nozzle 220 is located on the exhaust gas inflow path 10a side.

In the present embodiment, one supply nozzle 220 is provided. Alternatively, the number of the supply nozzles 220 may be one or more.

Thus, the mixture injected by the supply nozzle 220 is mixed with the exhaust gas. In the case of lime, the reaction with sulfur oxides (SOx) contained in the exhaust gas increases the particle size of the reactants. Since this is obvious to a person skilled in the art, a detailed description of this reaction will be omitted.

Then, the injected element flows to the ceramic filter 110 side in a mixed state with the exhaust gas.

The agitating unit 250 serves to supply, stir, and dissolve the solvent to the solid lime and solid elements flowing from the lime tank 300 and the urea tank 200. The solvent may be various materials that dissolve the lime and the urea, and water is used in this embodiment.

Particularly in this process, the solid lime having a lower melting point is primarily dissolved, and the subsequent solid element is secondarily dissolved by the reaction heat generated upon dissolution of the solid lime.

That is, since the solid element can be dissolved by the heat of reaction due to the lime dissolution, there is an advantage that the use of extra energy required for solid element dissolution can be minimized.

In this embodiment, the solid-state sublimation unit 250 may further include a solvent storage unit 500 connected to the solid-state sublimation unit 250 to supply the solvent to the solid sublimation unit 250. The solvent storage part 500 stores a quick lime and a solvent for reaction, which can flow through the solvent flow path 510.

However, unlike the present embodiment, it is needless to say that the solvent storage unit 500 may be formed not to store the solvent but to supply the solvent from the outside.

In the case of this embodiment, it may further include a sensing sensor 410 for sensing the concentration of sulfur oxides and nitric oxides in the exhaust gas flowing in the outflow path 10b and adjusting the supply amount of the mixture in the supply portion.

For this purpose, a control unit 414 may be provided on the supply control wiring 412 connecting the detection sensor 410 and the supply nozzle 220.

In addition, although not shown, the apparatus may further include a second heating unit for heating the exhaust gas flowing to at least one of the inlet 10a of the exhaust gas and the filter unit 100. [ In the case of SCR (Selective Catalytic Reduction) system, the reaction takes place at 280 ~ 510 ° C, which is the temperature level of the exhaust gas which is generally generated. However, when the temperature of the exhaust gas flowing is insufficient, .

The filter unit 100 is provided between the exhaust gas inflow path 10a and the outflow path 10b and at least one ceramic filter 110 is provided inside.

FIG. 2 is a view showing a state of the ceramic filter 110 provided in the filter unit in the exhaust gas harmful material reduction system according to the first embodiment of the present invention.

As shown in FIG. 2, in this embodiment, a plurality of ceramic filters 110 are arranged in the transverse direction and the longitudinal direction inside the filter portion, which are mounted on the support 120. The ceramic filter 110 can reduce dust, sulfur oxides and oxides contained in the exhaust gas.

Specifically, the sulfur oxide having increased particle size in response to the lime is collected together with the dust on the surface layer of the ceramic filter 110, and on the inner side of the ceramic filter 110, 110, the reaction is activated and removed by a catalyst coated or supported.

On the other hand, the filter unit may be provided with dust collecting means for removing dusts generated on the surface of the ceramic filter, and may be implemented in various forms. For example, the dust collection unit may be provided in the form of a vibration unit to remove dust by vibration, or may be provided in the form of a compressed air injection unit to remove dust and the like. Or an electrostatic precipitator may be used.

Hereinafter, another embodiment of the present invention will be described.

FIG. 3 is a view showing each configuration of the exhaust gas toxicant reduction system according to the second embodiment of the present invention.

As shown in FIG. 3, the exhaust gas toxicant reduction system according to the second embodiment of the present invention is formed as a whole in the same manner as the first embodiment described above.

However, in the present embodiment, the supply unit supplies the mixture to the front end of the ceramic filter 110, which is different from that of the first embodiment. That is, the supply passage 230 is branched toward the ceramic filter 100, and the mixture can be sufficiently mixed with the exhaust gas through a plurality of steps before the exhaust gas passes through the ceramic filter 110.

For this, the supply unit may further include an auxiliary supply nozzle 222, and in this case, the supply control wiring 412 may be connected to the auxiliary supply nozzle 222 so as to control the supply amount.

4 is a view showing the configuration of the exhaust gas toxicant reduction system according to the third embodiment of the present invention.

As shown in FIG. 4, the exhaust gas toxicant reduction system according to the third embodiment of the present invention is formed as a whole in the same manner as the second embodiment described above.

However, the present embodiment is different from the second embodiment in that a plurality of filter units 100a and 100b are continuously provided, and the supply unit further supplies the mixture to each of the plurality of filter units 100a and 100b . That is, a plurality of filter units 100a and 100b may be provided in multiple stages to further improve the effect of removing harmful substances contained in the exhaust gas.

The supply unit re-merges the mixture into the exhaust gas that has passed through the ceramic filter 110 provided in the filter unit 100a at the front, and the sulfur oxide and the NOx that have not yet been removed are removed from the ceramic filter 110 provided in the rear filter unit 100b. (110).

To this end, the supply unit may further include an auxiliary supply nozzle 222 between the plurality of filter units.

FIG. 5 is a view showing each configuration of the exhaust gas toxicant reduction system according to the fourth embodiment of the present invention. FIG.

As shown in FIG. 5, the exhaust gas toxicant reduction system according to the fourth embodiment of the present invention is formed as a whole in the same manner as the first embodiment described above.

However, in this embodiment, the stirring unit 250 includes a first heating unit 252 for raising the temperature of the stirring unit 250. That is, when the reaction heat due to lime melting is not sufficient, the first heating unit 252 can be used to stably supply additional heat.

The first heating unit 252 may be formed of various heating means, or a thermoelectric element or the like may be used.

It will be apparent to those skilled in the art that the present invention can be embodied in other specific forms without departing from the spirit or scope of the invention as defined in the appended claims. It is obvious to them. Therefore, the above-described embodiments are to be considered as illustrative rather than restrictive, and the present invention is not limited to the above description, but may be modified within the scope of the appended claims and equivalents thereof.

10a: Exhaust gas inflow path 10b: Exhaust gas outflow path
100: filter unit 110: ceramic filter
120: Support body 200: Element tank
210: Element flow path 220: Supply nozzle
222: auxiliary supply nozzle 230: supply flow path
250: stirrer 252: first heating unit
300: lime tank 310: lime oil
410: Detection sensor 412: Supply control wiring
414: control unit 500: solvent storage unit
510: Solvent flow path 520: Solvent spray nozzle

Claims (12)

A lime tank in which solid lime is contained;
An element tank in which a solid element is accommodated;
A filter portion disposed between an inlet path and an outlet path of the exhaust gas and including at least one ceramic filter for removing dust, sulfur oxides and nitric oxide contained in the exhaust gas;
An agitator for dissolving the solid lime by supplying a solvent to the solid lime and the solid element and stirring the solid lime and dissolving the solid element with the heat generated when the solid lime is melted to form a mixture; And
A supply part for supplying the mixture to the filter part; Wherein the exhaust gas is a nitrogen oxide. The method according to claim 1,
Wherein the supply unit includes:
A lime oil path connected to the lime tank to flow the solid lime to the agitation part, and an urea channel connected to the urea tank to flow the solid element to the agitation part. The method according to claim 1,
Wherein the supply unit includes:
And a supply passage connected to the agitating portion to flow the mixture. The method according to claim 1,
Wherein the supply unit includes:
And the mixture is supplied to the exhaust gas inflow path. 5. The method of claim 4,
Wherein the supply unit includes:
And supplying the mixture to the front end of the ceramic filter. The method according to claim 1,
Wherein the agitating portion includes a first heating unit for raising the temperature of the agitating portion. The method according to claim 1,
And a solvent storage unit connected to the agitation unit and supplying a solvent to the agitation unit. The method according to claim 1,
And a sensing sensor for sensing the concentration of sulfur oxides and nitrates of the exhaust gas flowing in the outflow path and adjusting the amount of the mixture in the supply portion. The method according to claim 1,
Wherein the filter unit is provided with a plurality of filter units. 10. The method of claim 9,
Wherein the supply unit includes:
And the mixture is supplied to each of the plurality of filter portions. The method according to claim 1,
Wherein the filter unit is provided with a vibration unit or a compressed air injection unit for removing the dust generated on the surface of the ceramic filter. The method according to claim 1,
And a second heating unit for raising the exhaust gas flowing into at least one of the inflow path of the exhaust gas and the filter unit.

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