KR102523953B1 - Spraying apparatus method of neutralizing agent in sdr - Google Patents

Abstract

The present invention relates to a method for spraying a neutralizer in a semi-dry reaction tower, which can increase the mixing efficiency in a reactor, use a minimum amount of neutralizer and reduce the concentration of the neutralizer, and landfill of fly ash, which was inevitably generated during the incineration process. It is effective to provide a method of spraying a neutralizer in a semi-dry reaction tower that can reduce the cost, satisfy the air pollution management standards of the incineration facility, and reduce the amount of operating power.

Description

Semi-dry reactor neutralizing agent injection method {SPRAYING APPARATUS METHOD OF NEUTRALIZING AGENT IN SDR}

The present invention relates to a method for injecting a neutralizer in a semi-dry reactor (hereinafter also referred to as 'SDR'), and more specifically, by adding a branch pipe and additionally supplying steam to lower the concentration and minimize the temperature drop, thereby reducing the input amount of the neutralizer It relates to a method for injecting a neutralizer in a semi-dry reaction tower capable of improving input efficiency and reducing operating power consumption even when reducing

Harmful gases generated from incineration facilities including combustion (hereinafter referred to as 'exhaust gas') require treatment because they typically include acid gases such as SOx, HCl, and HF, and environmental pollutants such as dioxin.

In general, high-temperature flue gas burned in an incinerator flows into a semi-dry reactor via a boiler facility, and acid gas in the flue gas reacts with a neutralizing agent such as slaked lime slurry sprayed into fine particles to obtain CaSO ₃ , CaF, CaCl by the following reaction equation A reaction product such as ₂ is generated, and the reaction product produced at this time is dried and collected in a powder state at the bottom of the reactor and in a bag filter.

[reaction formula]

SO ₂ + Ca(OH) ₂ -> CaSO ₃ + H ₂ O

SO ₃ + Ca(OH) ₂ -> CaSO ₄ + H ₂ O

2HCl + Ca(OH) ₂ -> CaCl ₂ + 2H ₂ O

2HF + Ca(OH) ₂ -> CaF ₂ + 2H ₂ O

As shown in the above reaction equation, when slaked lime having a molecular weight of 74 g/mol is used as a neutralizer, 170 L/H of slaked lime solids is sprayed into a semi-dry reactor designed with an equivalent ratio of flue gas treatment of 1.7 to obtain 100 L/H of calcium chloride having a molecular weight of 111 and a molecular weight of 100 L/H. 136 calcium sulfate, etc. are produced, and 70 L/H of unreacted slaked lime solids are discharged as fly ash. Therefore, the mass of the reacted powder increases by approximately 67%, and adding 70% of unreacted slaked lime results in an increase in the solid content of the sprayed neutralization liquid.

On the other hand, exhaust gas emission standards are gradually being strengthened due to environmental pollution problems. For example, the emission standard of 30 ppm of SOx and 15 ppm of HCl before 2020 has been strengthened to the standard of 20 ppm of SOx and 12 ppm of HCl from 2020.

As a method for satisfying these enhanced standards and improving the problems of the conventional method, a method of mixing neutralization liquid with dilution water and spraying it to exhaust gas at a low concentration has been attempted. Although this method is simple and effective in removing exhaust gas, it has problems in that it is impossible to operate due to temperature drop at the rear end of the reactor according to the amount of dilution water used, low-temperature corrosion of equipment, and clogging of the bag filter at the rear of the reactor. .

In addition, the method of supplying steam to the neutralizer slurry storage tank or raising the temperature by using an indirect heat exchanger at the outlet piping causes problems due to evaporation steam at the top of the storage tank and the neutralizer slurry is stuck inside the heat exchanger. It became.

Therefore, by improving the conventional method, development of a fundamental technology capable of reducing the landfill cost of fly ash inevitably generated in the incineration process, producing useful neutral salts at low cost and high efficiency, and reducing the equivalent ratio of neutralizer treatment and operating power of the semi-dry reactor. This is an urgent situation.

Korean Patent Publication No. 2012-18938

In order to solve the problems of the prior art as described above, the present invention is a semi-dry reaction that can drastically reduce the equivalent ratio of neutralizer treatment and operating power of a semi-dry reactor by improving mixing efficiency while reducing input raw materials and having excellent economic feasibility It is an object of the present invention to provide a method of spraying a neutralizer using a tower.

Another object of the present invention is to provide an exhaust gas treatment method using the neutralizer injection method.

The above and other objects of the present invention can all be achieved by the present invention described below.

In order to achieve the above object, the present invention

connecting an injection extension device having a mixing space of steam and a neutralizing agent to an injection device of a semi-dry reactor;

supplying a neutralizer and steam to the injection extension device to provide a mixture of the neutralizer and steam; and

It provides a method for spraying a neutralizer in a semi-dry reaction tower comprising the steps of supplying air to the mixture of the neutralizer and steam and injecting fine droplets into the reaction tower.
The neutralizing agent refers to slaked lime, quicklime, calcium carbonate, sodium hydroxide, potassium hydroxide, sodium carbonate, sodium hydrogen carbonate, and the like, and refers to use in the form of a slurry unless otherwise specified.

The injection extension device has a form in which the branch pipe and the supply pipe diverge at an inclination angle of 20° or more, and can form a continuous moving flow of steam and neutralizing agent at the junction.

또는

와 같은 Y자 형태로 제공되고, 합류 지점이 스팀과 중화제의 혼합공간을 형성할 수 있다. The branch pipe and supply pipe are

or

It is provided in a Y-shape such as, and the joining point can form a mixing space of steam and neutralizing agent.

The neutralizing agent is supplied at a concentration of 9 to 13 wt% through one pipe selected from the branch pipe or the supply pipe and steam is supplied through the remaining pipes, so that the mixing space of the steam and the neutralizing agent is 5 wt% or more 11 wt%. It can be diluted to concentrations below %.

The neutralizer may be supplied at a flow rate of 80 L/hr or more, and steam may be supplied at a flow rate of 85 L/hr or more.

The steam may be supplied from a waste heat boiler in an incineration facility equipped with a semi-dry reactor.

The air may be supplied at a pressure of 70 to 100 Nm ³ /hr through an air supply pipe connected to the injection device.

The microdroplet may have an average central particle diameter of 45 μm or less.

In addition, the present invention

connecting an injection extension device having a mixing space of steam and a neutralizing agent to an injection device of a semi-dry reactor;

Step of introducing flue gas into the semi-dry reactor;

supplying a neutralizer and steam to the injection extension device to provide a mixture of the neutralizer and steam;

supplying air to the mixture of the neutralizer and steam to spray fine liquid droplets into the reactor; and

It provides an exhaust gas treatment method using a semi-dry reactor including; discharging a neutral salt generated by reacting the exhaust gas with a neutralizing agent inside the reaction tower.

The exhaust gas treatment equivalent ratio of the reactor may be 1.2 or less.

The neutral salt is a powder containing CaSO ₄ and CaF and is collected in a bag filter at the rear of the reaction tower, and unreacted substances discharged together with the neutral salt may have an HCl emission amount of 12 ppm or less and a SOx emission amount of 20 ppm or less.

According to the present invention, since the waste heat generated in the incineration facility is used as a steam medium, the mixing efficiency in the reactor can be increased compared to the conventional semi-dry reaction tower neutralizer injection method, and the neutralizer is used in a minimum amount and the concentration of the neutralizer is reduced. There is an advantage to Specifically, as can be seen in the following examples, the amount of neutralizing agent used can be reduced by up to 40%.

In addition, it can satisfy the air pollution management standards of reinforced incineration facilities, reduce the landfill cost of fly ash that was unavoidably generated during the incineration process, and reduce the amount of air (compressed air) required for spraying, greatly reducing the amount of operating power. There are effects that can be done.

1 is a process flow chart showing a method of spraying a neutralizer in a semi-dry reactor according to an embodiment of the present invention.
2 is a process flow chart showing an exhaust gas treatment method using a method of spraying a neutralizer in a semi-dry reaction tower according to the present invention.
3 is a part assembly flow chart of the injection device 10 of the semi-dry reactor (not shown) used in the present invention, and the arrow indicates the location where the injection extension device 20 is installed.

Hereinafter, in order to aid understanding of the present invention, it will be described in detail with reference to the drawings.

Terms or words used in this specification and claims should not be construed as being limited to their usual or dictionary meanings, and given that the inventors may appropriately define the concept of terms in order to best describe the invention. Therefore, it should be interpreted as meaning and concept consistent with the technical spirit of the present invention.

In addition, the drawings are illustratively shown by extracting mainly the parts necessary for interpreting the gist of the present invention, and the present invention is not limited to the details shown in the drawings.

Like reference numerals designate like elements in the drawings.

Unless otherwise specified, the term "semi-dry reactor" in this description refers to an off-gas treatment facility that reacts with off-gassing using a neutralizing agent including slaked lime.

Unless otherwise specified, the term "exhaust gas" in this description refers to gases or particulates generated in the incineration process, most of which are water vapor and carbon dioxide, but also includes carbon monoxide, hydrocarbons, nitrogen oxides, sulfur oxides, hydrogen chloride, etc. refers to the exhaust gases in

The term "neutralizing agent" in the present description refers to slaked lime, burnt lime, calcium carbonate, sodium hydroxide, potassium hydroxide, sodium carbonate, sodium hydrogen carbonate, and the like, and refers to use in the form of a slurry unless otherwise specified.

The semi-dry reaction tower neutralizer injection method of the present invention is characterized in that steam is additionally supplied using an injection extension device to which a branch pipe is added.

The spraying method may be performed according to various embodiments.

1 is a process flow diagram illustrating a method of spraying a neutralizer in a semi-dry reactor according to an embodiment of the present invention.

Referring to FIG. 1, as step S1, an injection extension device having a mixing space of steam and a neutralizing agent is connected to an injection device of a semi-dry reactor. Subsequently, as step S2, a neutralizer and steam are supplied to the injection extension device to provide a mixture of the neutralizer and steam. Then, in step S3, when air is supplied to the mixture of the neutralizer and steam to spray fine droplets into the reactor, the concentration of the neutralizer input is reduced and the temperature drop of the neutralization reaction is minimized, thereby improving the input efficiency and operating power consumption even when the amount of neutralizer input is reduced. will also decrease.

In the present invention, the injection device of the semi-dry reaction tower to which the injection extension device is connected may be provided separately from the exhaust gas inlet passage at the top of the reaction tower, and if necessary, it is provided on the lower side of the reaction tower to facilitate light exhaust gas in the reaction tower. As it floats and sinks, it may be brought into contact with a number of neutralizers supplied through spraying.

3 is a part assembly sequence diagram of an injector 10 for supplying a neutralizing agent to the inside of a semi-dry reactor.

Referring to FIG. 3, the left side of the injector 10 indicates the direction in which the injector 10 is fixed to the semi-dry reactor, and the right side of numeral 109 (the part indicated by the arrow in FIG. 3) indicates the direction in which the neutralizing agent flows, according to the present invention. Corresponds to the part where the injection extension device 20 of is fastened. The neutralizer inlet may be directly connected to a neutralizer supply tank (not shown), and in the neutralizer supply tank, the neutralizer is diluted to an appropriate concentration and supplied in a slurry state.

Referring to FIG. 3, to provide the aforementioned inlet, an end plate 109, an air supply socket 108, a flange 110, an inside pipe 106, an outside pipe 107, and an outside pipe adapter ( 105), the nozzle adapter 104, the liquid cap 102, the retainer ring 103, and the air cap 101 are sequentially assembled, and the air required for spraying, for example, the compressed air, is the air supply socket 108, hereinafter It is supplied through the air supply pipe).

The injection device 10 may be manufactured by processing a metal or ceramic material having excellent corrosion resistance. If necessary, it is preferable that 8 to 19 spray holes protrude along the circumference because it can be applied to a wider area at once.

According to the present invention, the injection extension device 20 is fastened to the liquid inlet of the injection device 10 of FIG. 3 to extend the injection passage and provide a mixing space for the neutralizing agent (step of FIG. 1). Corresponding to step S1 and step S10 of FIG. 2, respectively).

The injection extension device 20 preferably has a form in which the branch pipe and the supply pipe diverge at an inclination angle of 20° or more, and forms a continuous flow of steam and neutralizing agent at the junction.

The inclination angle may be, for example, 20 to 50 °, preferably 20 to 40 °, more preferably 20 to 30 °, and most preferably 25 to 25 °, in this case, without disturbing the spray flow. Droplets can be injected into the reactor.

또는

와 같은 Y자 형태로 제공될 수 있고, 이때 합류 지점이 스팀과 중화제의 혼합공간을 형성하게 된다. The branch pipe and the supply pipe are, for example,

or

It may be provided in a Y-shape such as, and at this time, the joining point forms a mixing space of steam and neutralizing agent.

또는

와 같은 Y자 형태 중 합류부위를 삽입하여 공급통로를 연장하고 합류 위치를 스팀과 중화제의 혼합공간으로 제공하게 되며, 이때 상기 분기관 및 공급관은 (10)은 각각 내식성이 우수한 금속, 세라믹 소재 또는 합성수지재를 가공하여 제공될 수 있다. As a specific example, the injection extension device 20 is directed to the right inlet of FIG. 2, specifically, to the end plate 109 to transfer the neutralizing agent to the injection device 10 in the longitudinal direction of the injection device 10, as described above.

or

The supply passage is extended by inserting the joining part of the Y-shape, and the joining position is provided as a mixing space of steam and neutralizer. At this time, the branch pipe and the supply pipe (10) are made of metal, ceramic material or It may be provided by processing a synthetic resin material.

The synthetic resin material may preferably be polyethylene.

The installation position of the branch pipe is not particularly limited, and for example, when the supply pipe in which the branch pipe is primarily installed is virtually divided into three parts, it is installed near the 1/3 point closest to the side inserted into the inlet of the injection device 10. It is preferable to properly utilize the moving flow rate formed at the confluence point.

That is, the injection extension device 20 applied to the above-described injection method in the present disclosure is assembled with the air cap 101, the air supply socket 108, and the injection hole at the right side neutralizer inlet of FIG. 2, and then the injection device 10 And it is installed on the inlet side of the injection device 10 to extend the inlet.

As step S1 of FIG. 1, the injection extension device 20 may be fixedly installed to the injection device 10, but may be detachably installed if necessary. In the case of detachable installation, it has the advantage of being easy to separate when repair or replacement is required.

In addition, when the neutralizer and steam are introduced at an angle through the branch pipe and the supply pipe, a continuous moving flow can be formed at the confluence point.

Unless otherwise specified, the term "continuous moving flow" in the present description refers to staying longer than a certain extent at the point where the neutralizing agent and steam join, unlike the conventional air used to rapidly transfer the polymerization solution.

For example, the width of the branch pipe is 0.5 to 1.5 times the width of the supply pipe, and the length of the branch pipe may be 0.5 to 3 times the length of the supply pipe. The width of the tubes can be changed according to the flow rate and the pressure in the tubes. For example, in order to adjust the internal flow rate to correspond to about twice the inlet flow rate when the pressure of the pipes is constant, the width of the branch pipe is 0.5 to 1.5 times the width of the supply pipe, specifically 0.7 to 1.3 times the length of the branch pipe. It is preferable to increase the mixing efficiency at the point of confluence of the neutralizer and steam to make 0.5 to 3 times the length of the supply pipe, specifically 1 to 2 times the length of the supply pipe.

In addition, the length of the branch pipe is preferably 0.5 to 3 times the length of the supply pipe and at the same time 0.1 to 0.8 times the length of the neutralizer injector, specifically 0.1 to 0.4 times. In this case, it is possible to appropriately provide the effect of providing the fine jetted liquid droplets by extending the jetting passage.

By having such a configuration, the steam used as a medium in the spraying process of the present invention is not directly supplied, but is primarily mixed with the neutralizer to adjust the concentration of the neutralizer, thereby improving the water content and the size of the spray droplets. there is.

Subsequently, in step S2 of FIG. 1, a neutralizer and steam are supplied to the branch pipe and the supply pipe of the injection extension device connected to the injection device, respectively, to provide a mixture of the neutralizer and steam. At this time, the neutralizing agent may be supplied to the branch pipe and steam may be supplied to the supply pipe, or the neutralizing agent may be supplied to the supply pipe and steam may be supplied to the branch pipe.

That is, the neutralizer is supplied at a concentration of 9 to 13 wt%, specifically 11 wt%, through one pipe selected from the branch pipe or supply pipe, and steam is supplied through the other pipe, so that the steam and the neutralizer It can be diluted to a concentration of 5 wt% or more and less than 11 wt% in the mixing space of.

At this time, the neutralizer may be supplied at a flow rate of 80 L/hr or more, and the steam may be supplied at a flow rate of 85 L/hr or more.

The amount of the neutralizer can be adjusted in real time according to the state of the exhaust gas to be treated, for example, 80 to 450 L/H, and specific examples, 150 to 250 L/H. there is. For example, steam at 143 to 158 °C is introduced within the range of 4 to 6 kgf/cm ² , and it may be supplied and used from a waste heat boiler in an incineration facility.

In addition, since the mixture of the concentration-adjusted neutralizer and steam supplied through the supply passage extended through the injection extension device 20 is injected into the exhaust gas through the front injection hole of the injection device 10, the heating condition is omitted. There is an advantage in terms of cost of the treatment process.

Then, in step S3 of FIG. 1, air may be supplied to the mixture of the neutralizer and steam to spray fine droplets into the reaction tower, and the mixing efficiency may be improved due to the miniaturized droplet size, thus optimizing the neutralizer. It also provides the added benefit of being able to use the inputs that have been

In the present description, the average particle diameter (average central particle diameter) of droplets sprayed through the spray hole provided in the neutralizer supply member 10 is, for example, 80 um or less, preferably 30 to 80 um, more preferably 30 to 80 um. At 60um, it can be seen that the average particle diameter is finer than the previous average particle diameter of 80 to 150um.

In the present description, the average particle diameter of droplets refers to the average particle diameter measured with a particle size analyzer after dispersing droplets or droplets in an appropriate dispersion medium (eg water), and observing several points (eg 10 points) by SEM, The average value can be obtained from the particle size. In the case of measurement, when the individual particle diameter is not spherical, the length of the longest major axis is taken as the particle diameter.

From the above-mentioned additional advantages, improved reaction efficiency can be provided even if the exhaust gas treatment equivalent ratio of the semi-dry reactor is reduced, and in the present disclosure, the exhaust gas treatment equivalent ratio of the reactor is previously designed to be about 1.7 to 1.2 or less. Can be lowered.

At this time, air may be supplied at a pressure of 70 Nm ³ /hr or more, or 3.0 kg/m ² or more through an air supply pipe connected to the injection device, and specific examples include 70 to 100 Nm ³ /hr, or 3.0 to 4.0 kg/m. It can be supplied at a pressure of ² . As used herein, the unit Nm ³ /H (normal louve) refers to the volume of a gas flowing per hour through a mass of gas (including air) at 0°C and atmospheric pressure, unless otherwise specified.

Hereinafter, an exhaust gas treatment method using the semi-dry reactor injection method according to the above-described embodiment of the present invention will be described in detail with reference to FIG. 2 . Repetitive description of the contents overlapping with the contents described in the above spraying method will be omitted.

2 is a process flow chart showing an exhaust gas treatment method using a semi-dry reactor tower neutralizer injection method according to an embodiment of the present invention.

Referring to FIG. 2, in step S10, an injection extension device having a mixing space of steam and a neutralizing agent is connected to an injection device of a semi-dry reactor. The corresponding step may be performed in the same manner as in step S1 described above. Subsequently, as step S20, flue gas is introduced into the semi-dry reactor.

Then, in step S30, a neutralizer and steam are supplied to the injection extension device to provide a mixture of the neutralizer and steam. The corresponding step may be performed in the same manner as in step S2 described above. Furthermore, in step S40, air is supplied to the mixture of the neutralizer and steam to spray fine droplets into the reactor. The corresponding step may be performed in the same manner as in step S3 described above.

Then, as step S50, the neutral salt produced by reacting the exhaust gas with a neutralizer inside the reactor is discharged.

The neutral salt is a powder containing CaSO ₄ and CaF and is collected in a bag filter at the rear of the reaction tower, and unreacted substances discharged together with the neutral salt may have an HCl emission amount of 12 ppm or less and a SOx emission amount of 20 ppm or less.

In addition, unreacted materials are discharged to a stack through a bag filter at the rear of the semi-dry reactor. The HCl and SOx contents emitted in this way are 12 ppm or less and 20 ppm or less, respectively, satisfying all of the strengthened emission standards after 2020.

That is, when the injection extension device of the present invention is used, it is possible to provide a method for spraying a neutralizer in a semi-dry reaction tower that satisfies the air pollution management standards of an intensified incineration facility, and in particular, a technique capable of reducing the processing equivalent ratio of a semi-dry reaction tower has the effect of providing

Specifically, the exhaust gas treatment equivalence ratio of the semi-dry reactor can be reduced from the conventional design of about 1.7 to about 1.2 by improving the mixing efficiency, while reducing the amount of neutralizer used.

In describing the injection method and the exhaust gas treatment method of the present description, it is specified that other conditions or equipment not explicitly described may be appropriately selected within the range commonly practiced in the art and are not particularly limited.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings so that those skilled in the art can easily carry out the present invention. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein.

[Example]

Example 1

형상이 되도록 설치하여 합류부위에 스팀과 중화제의 혼합공간을 형성하였다. An injection extension device having a branch pipe (not shown) and a supply pipe (not shown) was made of STS material. Specifically, in the longitudinal direction of 150 mm in length and 21.7 mm in width, a branch pipe with a length of 160 mm and a width of 21.7 mm is inclined at an angle of 20 ° at a position of 40 mm from the front end of the supply pipe.

It was installed in such a way that a mixing space of steam and neutralizing agent was formed at the junction.

In addition, the injection device 10 was manufactured by assembling parts made of STS material in the order shown in FIG.

Specifically, as shown in FIG. 3, at the right inlet, the end plate 109, the air supply socket 108, the flange 110, the inside pipe 106, the outside pipe 107, and the outside pipe The adapter 105, the nozzle adapter 104, the liquid cap 102, the retainer ring 103, and the air cap 101 were sequentially assembled.

The manufactured injector 10 was provided at the top of a semi-dry reactor (not shown). At this time, air was supplied through the air supply socket 108.

형상의 분사연장장치 중 합류부위를 삽입하여 분사 통로를 연장하였다. As step S1 of FIG. 1 or step S10 of FIG. 2, the injector 10 was previously manufactured in the direction of the arrow.

The injection passage was extended by inserting the confluence part of the injection extension device of the shape.

Next, as step S20 of FIG. 2, exhaust gas generated by 50 tons of domestic waste (including dry incineration of sewage sludge) was supplied into the reactor.

As step S2 of FIG. 1 or step S30 of FIG. 2, slaked lime slurry diluted to a concentration of 11 wt% by using a water supply pipe of 20 wt% slaked lime is passed through an extended passage, specifically the branch pipe of the above-described spray extension device supplied.

Subsequently, 100 L/H of steam generated in the waste heat boiler was supplied through the supply pipe of the above-described injection extension device.

In step S3 of FIG. 1 or step S40 of FIG. 2, compressed air was injected at 80 NM ³ /H through the air supply member 108 of the injection device 10 to supply the sprayed droplets to the semi-dry reactor.

As a result of continuously performing the process of discharging the neutral salt generated in the reactor as step S50 of FIG. 2 for one month, it was confirmed that the equipment was operated without trouble.

Comparative Example 1

The process of Example 1 was repeated, except that steam was not supplied in step S2 of FIG. 1 or step S30 of FIG. 2, and the same process as in Example 1 was repeated.

Comparative Example 2

The process of Example 1 was repeated, except that dilution water was supplied instead of steam in step S2 of FIG. 1 or step S30 of FIG. 2, and the same process as in Example 1 was repeated.

[Test Example]

In Example 1 and Comparative Examples 1 and 2, the central particle diameter of the sprayed droplet, the HCl emission content, the SOx emission content, and the operating power consumption were measured in the following manner, and are shown in Table 1 below along with specific reaction conditions.

* Emissions of HCl and SOx: The contents discharged through the semi-dry reactor and the bag filter were measured using a chimney remote monitoring system (TMS).

*Operation power consumption (Kw): Power savings were calculated based on air consumption.

division Example 1 Comparative Example 1 Comparative Example 2 target of injection air + steam air air + diluted water injection concentration 6% 11% 9% Neutralizer type calcium hydroxide calcium hydroxide calcium hydroxide equivalence ratio 1.2 1.7 1.7 Average spray droplet diameter 45um 100um 100um slaked lime usage 120% 170% 170% Amount of fly ash (ton/day) 0.95 1.35 1.36 HCl emissions (ppm) 4.17 4.2 4.3 SOx emissions (ppm) 8.51 8.4 8.6 Air consumption (NH ₃ /Hr) 73 150 150 Operating power (Kw) 11.0 19.33 19.33

As shown in Table 1, according to Example 1 manufactured by the injection method in which steam was added using the injection extension device having a branch pipe of the present invention, the injection method without steam of Comparative Example 1 or the dilution of Comparative Example 2 Compared to the case where the water spray method was applied, it was confirmed that the amount of neutralizer used and the spray concentration were drastically lowered, and the reaction efficiency was improved by providing micronized spray droplets.

In addition, it was confirmed that the HCl emission standard (12ppm) and SOx emission standard (20ppm), which were strengthened in 2020, were met, respectively.

In particular, according to Example 1 using steam using a high-temperature and high-pressure waste heat boiler, it was confirmed that the operating power consumption was reduced by more than 40% compared to Comparative Example 1, and the resulting power saving effect of 8.33Kw was also confirmed.

In conclusion, the semi-dry reaction tower neutralizer injection method and the exhaust gas treatment method using the same according to the present invention refine the spray droplets, increase the mixing efficiency, and optimize the concentration while using the minimum amount of the neutralizer. Satisfying the air pollution management standards of incineration facilities that have been strengthened while reducing landfill costs, and satisfying the air pollution management standards of intensified incineration facilities while reducing operating power consumption, as well as reducing the treatment equivalent ratio of semi-dry reactors. I was able to confirm that it was provided.

10. Neutralizer injector
20. Injection extension device

Claims (11)

connecting an injection extension device having a mixing space of steam and a neutralizing agent slurry to an injection device of a semi-dry reaction tower;
supplying the neutralizer slurry and steam to the injection extension device to provide a mixture of the neutralizer slurry and steam; and
Injecting fine liquid droplets into the reactor by supplying air to the mixture of the neutralizer slurry and steam;
The injection extension device has a form in which a branch pipe and a supply pipe are branched at an inclination angle of 20 to 30 °,
The semi-dry reactor neutralizer injection method, characterized in that the fine droplets have an average particle diameter of 30 to 80um. According to claim 1,
The spray extension device forms a continuous moving flow of steam and neutralizer slurry at the junction of the branch pipe and the supply pipe. According to claim 1,
The branch pipe and the supply pipe are provided in a Y-shape, and the confluence point forms a mixing space of steam and neutralizer slurry. According to claim 1,
The neutralizer slurry is supplied at a concentration of 9 to 13 wt% through one pipe selected from the branch pipe or the supply pipe, and steam is supplied through the remaining pipes, so that the mixture of the steam and the neutralizer slurry is 5 wt% or more A method for spraying a neutralizer in a semi-dry reactor, characterized in that it is diluted to a concentration of less than 11 wt%. According to claim 1,
The neutralizer slurry is supplied at a flow rate of 80 L / hr or more, and the steam is supplied at a flow rate of 85 L / hr or more. According to claim 1,
The semi-dry reaction tower neutralizer injection method, characterized in that the steam is supplied from a waste heat boiler in an incineration facility equipped with a semi-dry reaction tower. According to claim 1,
The air is supplied at a pressure of 70 to 100 Nm ³ /hr through an air supply pipe connected to the injection device, and the injection device assembles an air supply socket and a nozzle adapter for supplying air in the inflow direction of the neutralizer slurry A semi-dry reaction tower neutralizer injection method, characterized in that. According to claim 1,
The semi-dry reaction column neutralizer spraying method, characterized in that the fine droplets have an average particle diameter of 30 to 45 μm. connecting an injection extension device having a mixing space of steam and a neutralizing agent slurry to an injection device of a semi-dry reaction tower;
Step of introducing flue gas into the semi-dry reactor;
supplying the neutralizer slurry and steam to the injection extension device to provide a mixture of the neutralizer slurry and steam;
supplying air to the mixture of the neutralizer slurry and steam to inject fine liquid droplets into the reactor; and
Including; discharging a neutral salt generated by reacting exhaust gas with the micro-droplets inside the reactor;
The injection extension device has a form in which a branch pipe and a supply pipe are branched at an inclination angle of 20 to 30 °,
The fine droplet is an exhaust gas treatment method using a semi-dry reactor, characterized in that the average particle diameter is 30 to 80um. According to claim 9,
An exhaust gas treatment method using a semi-dry reactor, characterized in that the exhaust gas treatment equivalent ratio of the reactor is 1.2 or less. According to claim 9,
The neutral salt is a powder containing CaSO ₄ and CaF and is collected in a bag filter at the rear of the reactor, and the unreacted material discharged together with the neutral salt is HCl emission of 12 ppm or less and SOx emission of 20 ppm or less. Exhaust gas treatment method using a semi-dry reactor.

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