KR102347101B1 - Hybrid wet electrostatic dust precipitator and slurry fueling system with the same - Google Patents

Abstract

The present invention relates to a hybrid wet electrostatic dust collector and a sludge fuel-conversion system having the same applied thereto. According to the present invention, the hybrid wet electrostatic dust collector comprises: a first dust collection unit receiving a gas containing dust generated in a process of drying sludge in a dryer provided in a sludge fuel-conversion system to collect dust primarily; a second dust collection unit secondarily collecting dust from the gas from which the dust is partially removed in the first dust collection unit; and a discharge unit discharging the dust collected in the first dust collection unit and the second dust collection unit. Accordingly, the hybrid wet electrostatic dust collector includes a configuration in which the dust discharged from the discharge unit is discharged through a discharge pipe to be recirculated to a mixer of the sludge fuel-conversion system, so that the dust generated in a sludge-drying solid fuel production process is collected and recycled, thereby increasing dust collection efficiency for fine particles and processing a large amount of gas due to a small pressure loss.

Description

Hybrid wet electric dust collector and sludge fuel conversion system to which it is applied

The present invention relates to a sludge fuel conversion system, and more particularly, to a hybrid wet electric dust collector for collecting dust contained in dry exhaust gas generated in the process of drying sludge and converting it into fuel, and a sludge fuel conversion system to which the same is applied.

Sludge refers to the wastewater treated wastewater, and contains a large amount of water and organic and inorganic substances. This sludge is composed of more than 80% water and solids remaining after sewage treatment, so various processes must be performed for post-treatment.

In particular, sludge is classified as waste and waste treatment methods such as landfill and incineration must be applied.

In addition, even if moisture is removed, more than 97% of the solids contained in the sludge are composed of organic matter, and the chlorine produced by the chlorine (Cl) used in the purification process remains. For this reason, even when methods such as landfill or incineration are used, toxic compounds are generated when burned at low temperatures, and problems such as soil contamination, toxic leachate generation, and odor generation occur due to toxic compounds and organic substances during landfilling.

Due to these problems, a method for treating sludge is required, and when moisture is removed from the sludge, it can be converted into fuel, so methods for efficiently removing moisture from the sludge are being sought in terms of recycling waste resources.

However, in the case of sludge, due to the agglomeration of solids and the characteristics of solids composed of fine particles, all of the conventional drying methods fail or succeed, but the economic feasibility is low, so that fueling of sludge is not realized. For this reason, the prior art suggests a method for drying sludge in various forms.

As an example, although a method of mixing sludge and other materials is suggested as a general method, the mixing rate with other materials is reduced due to agglomeration of the sludge, and even if mixed, there is a problem of separation in the drying process.

In addition, for high moisture content and fast drying, additional problems such as the generation of a large amount of carbon dioxide during the drying process have been caused by reliance on heating using fossil fuels in the past.

In addition, a large amount of energy is consumed when heating and drying due to the viscosity of the sludge, but there is a problem in that the drying efficiency is lowered.

In order to solve this problem, the present applicant discloses a sludge fueling system capable of producing renewable energy by drying sludge in a number of Patent Documents 1 to 3, such as the following Patent Documents 1 to 3, and a bio-drying device and a thermal drying device for drying the sludge. Thus, a patent application has been filed and registered.

On the other hand, as described above, the sludge contains a large amount of moisture, so it can be used as a fuel after the drying process to be used as a solid fuel. occurs in large numbers.

And as the high moisture content sludge is dried, as the moisture contained in the exhaust gas is condensed, the particles grow in contact with the dust, which causes adhesion in the pipe, blockage, or an increase in the load on the rear end environmental facilities.

In addition, in the sludge solid fuel production process, odors are generated due to the characteristics of raw materials, so installation of odor reduction facilities for dry exhaust gas is inevitable. increased, and provided a cause for complaints.

Republic of Korea Patent Registration No. 10-2168292 (Announced on October 21, 2020) Republic of Korea Patent Registration No. 10-2168291 (Announced on October 21, 2020) Republic of Korea Patent Registration No. 10-2168293 (Announced on October 21, 2020)

An object of the present invention is to solve the above problems, and to provide a hybrid wet electric dust collector for collecting and removing dust generated in a sludge solid fuel production process using an indirect heat source.

Another object of the present invention is to simultaneously remove the adhesive fine dust and droplets generated in the sludge solid fuel production process, reduce pressure loss to enable the treatment of a large amount of dry exhaust gas, and apply the automatic discharge function of collected dust to generate wastewater To provide a lead wet electrostatic precipitator capable of reducing

Another object of the present invention is to provide a hybrid wet electric dust collector capable of recycling the collected dust to a sludge solid fuel production process and a sludge fueling system to which the same is applied.

In order to achieve the above object, the hybrid wet electric dust collector according to the present invention includes a first dust collector for receiving a gas containing dust generated in the process of drying sludge in a dryer provided in a sludge fuel conversion system and collecting primary dust; A second dust collecting unit for secondary dust collecting dust from the gas from which the dust has been partially removed by the first dust collecting unit, and a discharge unit for discharging the dust collected from the first dust collecting unit and the second dust collecting unit, the dust discharged from the discharge unit is It is discharged through the discharge pipe and is characterized in that it is recycled to the mixer of the sludge fuel conversion system.

In addition, in order to achieve the above object, the sludge fuel conversion system to which the hybrid wet electric dust collector according to the present invention is applied is a mixer for producing a primary mixture by mixing sludge and additives, and the primary mixture supplied from the mixer. A first dryer for primary drying to a first moisture content by bio-drying, a second dryer for producing a dry mixture of a second moisture content by heating and drying the primary mixture of the first moisture content, and press-molding the dry mixture A molding machine for producing solid fuel and a hybrid wet electric dust collector for separating dust generated during the drying process of the first and second dryers from gas and collecting the dust, wherein the dust collected in the hybrid wet electric dust collector is mixed with the mixer It is characterized in that it is recycled as a solid fuel by recycling it to any one or more of the first and second dryers.

As described above, according to the hybrid wet electric dust collector according to the present invention and the sludge fuel conversion system to which it is applied, the effect that dust generated in the sludge dry solid fuel production process can be collected and recycled is obtained.

Accordingly, according to the present invention, it is possible to improve the dust collection efficiency for fine particles and to process a large amount of gas due to a low pressure loss.

And according to the present invention, it is possible to collect smoke, fumes, droplets, etc., it is possible to design free of specific resistance and adhesion of dust particles, it is possible to design even at the processing gas temperature below the dew point, and automatic discharge of the collected dust is possible. The effect of reducing the amount of wastewater generated through the

Therefore, the present invention is suitable for the sludge solid fuel production system compared to other dust removal facilities because it is easy to remove the dust of the wet gas containing a large amount of dust.

In addition, according to the present invention, in order to increase the dust removal efficiency, a first dust collector provided with a centrifugal dust collector and a second dust collector provided with a wet electric dust collector are applied to primarily collect dust having a large specific gravity, and secondly collect fine dust The effect is that it can be done. .

In particular, according to the present invention, the dust collecting electrode and the vane through which the dust moves are applied in the dust collecting module provided in the second dust collecting unit, and the time remaining inside the dust collecting module is increased by spraying washing water to rotate and lower the collected dust, The effect that the cleaning efficiency can be increased by uniformly cleaning the surface of the dust collecting electrode is obtained.

In addition, according to the present invention, when applied to the sludge dry solid fuel production process, it is possible to solve the problem of efficiency decrease due to the dust load of the conventional odor reduction equipment, and it is possible to reduce the amount of chemical consumption supplied to the odor reduction equipment, and the odor The effect of preventing civil complaints due to odor problems in advance is obtained through the normal operation of the abatement facility.

In addition, according to the present invention, fine dust emission can be greatly reduced when industrial fuel is used due to environmental issues such as fine dust, and social value can be created through technology development related to the biomass energy industry, where fierce competition is expected. In addition, it is possible to establish a natural circulation energy production system according to the environmental improvement effect such as fine dust and the conversion of biomass, which has been recognized as waste, into energy. The effect is that it can be done.

In addition, according to the present invention, it is possible to contribute to the energy treatment of sewage sludge through the reduction of drug consumption cost by solving the problem of the reduction in efficiency of the odor reduction facility, the solid fuel conversion process supply project to local governments possessing sewage treatment plants and customers, and the odor reduction facility Contributes to reducing the amount of fine dust generated by reducing ammonia emission from domestic sewage sludge, reducing coal import costs when converting domestic sewage sludge into solid fuel and applying it to thermal power plants .

1 is a block diagram of a sludge fuel conversion system to which a hybrid wet electric dust collector according to a preferred embodiment of the present invention is applied;
2 is a view for explaining the dust removal principle of the wet electrostatic precipitator;
3 is a block diagram of a hybrid wet electric dust collector according to a preferred embodiment of the present invention;
4 is an enlarged view of the dust collecting module shown in FIG. 3;
5 is a cross-sectional view and a partially enlarged view of the dust collecting module shown in FIG. 4;
6 is a process diagram illustrating step-by-step an operating method of a hybrid wet electric dust collector according to a preferred embodiment of the present invention.

Hereinafter, a hybrid wet electric dust collector according to a preferred embodiment of the present invention and a sludge fuel conversion system to which the same is applied will be described in detail with reference to the accompanying drawings.

Hereinafter, terms indicating a direction such as 'left', 'right', 'front', 'rear', 'up' and 'downward' are defined as indicating each direction based on the state shown in each figure. do.

First, the configuration of the sludge fuel conversion system to which the hybrid wet electric dust collector according to a preferred embodiment of the present invention is applied will be described in detail with reference to FIG. 1 .

1 is a block diagram of a sludge fuel conversion system to which a hybrid wet electric dust collector according to a preferred embodiment of the present invention is applied.

As shown in FIG. 1, the sludge fuel conversion system 10 to which the hybrid wet electric dust collector is applied according to a preferred embodiment of the present invention mixes sewage sludge (hereinafter referred to as 'sludge') 11 and an additive 12. A mixer 20 to produce a primary mixture, a first dryer 30 for primary drying the primary mixture supplied from the mixer 20 to a first moisture content by bio drying, the first It includes a second dryer 40 for producing a dry mixture of a second moisture content by heating and drying the primary mixture of 1 moisture content, and a molding machine 50 for producing a solid body by press-molding the dry mixture.

And the sludge-to-fuel system 10 to which the hybrid wet electric dust collector according to a preferred embodiment of the present invention is applied is a hybrid wet electric dust collector 60 for collecting dust generated in the solid fuel production process by drying the sludge 11 and , it further includes an environmental facility 70 for reducing odors contained in the air discharged from the hybrid wet electric dust collector 60 .

Hereinafter, only the necessary components will be described in describing the configuration of the present invention.

That is, devices such as a hopper for storage, a boiler for heating, a steam pipe, an air pump, and a hoist when constructing a sludge fuel conversion system may be additionally configured. However, the omitted configuration is matters that can be easily selected and applied by those skilled in the art, and does not mean that the configuration not described is an unnecessary configuration.

The mixer 20 produces a primary mixture by kneading or kneading the sludge 11 and the additive 12 . Here, the mixing of the sludge 11 and the additive 12 may not be smooth due to the aggregation of the sludge 11 and the floating phenomenon due to the small density of the additive 12 . So, in the mixer 20, the particles of the sludge 11 and the additive 12 are in contact as much as possible, and the agglomeration of the sludge 11 is eliminated and mixed.

By this mixer 20, the mixing rate and mixing uniformity of the primary mixture are increased, and the size of the mixed particles is small and uniformly formed. Through this, the mixer 20 can primarily lower the moisture content of the sludge 11 .

To this end, the mixer 20 may be provided with a mixing means in a form that can be kneaded while mixing the mixture inside the container. The mixing means may have a screw-shaped blade continuously formed on the shaft, or a plurality of paddles.

For example, the additive 12 may be in a dry state having a moisture content of 10% or more and 15% or less, and the particle size may be 5 mm or less.

These additives 12 may include a bulking agent (or bulking agent, bulking agent) and supplements (amendment) that increase the amount without affecting the properties of the sludge 11 .

The sludge 11 may have a moisture content of 75% or more and 85% or less.

As such, the moisture content presented in this embodiment is adjusted close to the numerical value presented in the actual process, and may not have an accurately designated numerical value. That is, it is preferable that the numerical values presented in this embodiment be understood as numerical values capable of deriving an optimal result.

The first dryer 30 receives the primary mixture generated by the mixer 20 and performs drying. That is, in the first dryer 30, a drying process for lowering the moisture content of the primary mixture to the first moisture content is performed.

The first dryer 30 may dry the primary mixture by various methods to have a primary moisture content.

For example, the first dryer 30 may be dried by heat of burning fuel such as gas or petroleum, or may be dried using natural light. Alternatively, the first dryer 30 may be dried by heat decomposed or oxidized in the process of reacting the organic material in the primary mixture with microorganisms or oxygen.

In addition, the first dryer 30 may use a thermal dryer as the first dryer 30 , and both the first dryer 30 and the second dryer 40 may be configured as thermal dryers.

However, in this embodiment, it will be described that the first dryer 30 is a bio-drying device for drying by microorganisms, and the second dryer 40 is a thermal drying device.

Thus, the first dryer 30 supplies oxygen (O ₂ ) in the air to the inside of the first dryer 30 to induce the metabolic action of aerobic microorganisms, and organic matter is converted into carbon dioxide (CO ₂ ), water ( H ₂ O) and ammonia (NH ₃ ) The primary mixture is dried using the heat of metabolism generated when decomposed. Through this, the first dryer 30 dries so that the moisture content of the sludge 11, which is about 75% to 85%, becomes a moisture content of 35% or more and 40% or less, which is the first moisture content.

The first moisture content is experimentally calculated and may vary depending on the scale and drying efficiency of the first dryer 30 .

If the first moisture content is set to 40% or more, the efficiency may decrease in the drying process by the second dryer 40 and the drying period may increase. That is, the consumption of fuel used for drying by heating of the second dryer 40 may be increased.

On the other hand, when the first moisture content is set to less than 35%, the size of the first dryer 30 is increased, or the time the primary mixture stays in the first dryer 30 is increased, so that drying efficiency is reduced. That is, according to the adjustment of the first moisture content, economical efficiency due to an increase in fuel consumption for drying or an increase in cost for manufacturing and operating the dryer or an increase in the residence time in the first dryer 30 may cause a decrease in efficiency.

Accordingly, the first moisture content is a matter to be adjusted according to the configuration of the dryer in the sludge fuel conversion system 10, and does not necessarily have to be defined as a moisture content of 35% or more and 40% or less.

The second dryer 40 produces a dry mixture by drying the primary mixture supplied from the first dryer 30 to a second moisture content, which is a moisture content that can be molded into fuel by secondary drying.

To this end, the second dryer 40 is provided with a heat transfer means for heating and drying the primary mixture therein. In addition, the second dryer 40 prevents the primary mixture from being separated into the sludge 11 and the additive 12 during the heating process to maintain the mixed state, and to increase the contact rate between the heat transfer means and the mixture. It may include a stirring means for stirring.

The second dryer 40 uses an indirect heating method by a heat source to prevent carbonization or oxidation in the process of drying the primary mixture of the first moisture content, and to increase heat utilization efficiency.

To this end, the second dryer 40 passes a heating medium supplied through a pipe from a heating device such as a boiler or heater into the second dryer 40 to heat and dry the mixture. In addition, the second dryer 40 may further include a discharging means for discharging the moisture and mixture dust inside the second dryer 40 generated by heating and drying to the outside.

The second dryer 40 dries the primary mixture to generate a dry mixture having a second moisture content, and supplies the dry mixture to the molding machine 50 . Like the first dryer 30 , the second dryer 40 may be configured to allow continuous input and continuous discharge.

Here, in the case of a continuous input and continuous discharge method, the drying efficiency may be reduced due to an increase in the size of the second dryer 40 and an increase in the amount of fuel used. Therefore, the second dryer 40 may be operated in such a way that it performs drying of a predetermined set capacity unit in consideration of efficiency, discharges all of the dry mixture, and then receives the primary mixture again. However, the drying method of the set capacity unit is more advantageous for drying, and the continuous input and continuous discharge methods cannot be used, and thus the present invention is not limited thereto.

To this end, an intermediate storage tank (not shown) in which the primary mixture discharged from the first dryer 30 is primarily stored may be provided between the first dryer 30 and the second dryer 40 .

The molding machine 50 produces solid fuel by press-molding the dry mixture supplied from the second dryer 40 . Here, the solid fuel produced may be pellet fuel.

The molding machine 50 may be an injection molding machine for pressure molding, and may include an injection tool, a pressing unit for pressing the dry mixture to the injection tool, and a supply unit for supplying the dry mixture between the pressing unit and the injection mold. .

Of course, the molding machine 50 may produce a solid fuel by pressing the dry mixture in the form of compressed coal, which is one large mass, in addition to the pellets, which are small-sized lumps.

The environmental facility 70 may include a scrubber and activated carbon for removing odor substances through chemical treatment by spraying water containing a chemical to the gas from which dust has been removed from the dust collector.

Therefore, the environmental facility 70 removes the odor substances of the gas from which the dust has been removed by the hybrid wet electric dust collector 60 and discharges purified air, thereby solving civil complaints due to odors.

As such, the sludge fuel coal system 10 according to the present embodiment can mass-produce pellet-type sludge fuel coal to maximize profitability and production.

That is, the conventional sludge fueling technology mostly dried or carbonized the sludge and produced a powdery solid fuel as a by-product. there was.

On the other hand, the pellet-type sludge fuel coal produced according to this embodiment is similar in shape, quality, combustion method (combustion of the same unit), etc. It is a domestic biomass fuel that can be used as an alternative fuel for wood pellets that depend on imports.

As such, the present invention performs drying of the sludge through the optimal drying efficiency according to the production of solid fuel by primary and secondary drying of the sludge, and through this, the fuel production efficiency is increased to treat a large amount of sludge and sludge Renewable energy can be produced through processing.

That is, in the present invention, efficient primary drying can be achieved by resolving agglomeration of sludge or sludge mixture, and as most of the moisture is removed by the bio-drying method, the use of fuel for drying is minimized and the moisture content suitable for fueling can be reached quickly.

In addition, the present invention can improve the thermal efficiency of the dryer by increasing the contact area with the heat supplier, and minimize the generation of dust while maintaining the mixed state of the sludge and the additive during the drying process.

On the other hand, in the conventional solid fuel production process using sludge, to remove dust, a centrifugal dust collector and a filter dust collector are mainly used in connection. This is because the hot air for drying the sludge is directly supplied, so as the dried exhaust gas is transferred to the dust removal device at a temperature above the dew point of about 160 ° C. It is possible.

The sludge drying method using such a direct hot air supply has a disadvantage in that, as hot air of about 800° C. directly contacts the sludge, some of the combustible parts of the sludge are volatilized and the calorific value decreases.

For this reason, in order to improve the quality of solid fuel and reduce energy consumption, a drying method using an indirect heat source is preferred.

However, in the case of the conventional sludge drying method using an indirect heat source, the temperature of the discharged dry exhaust gas is around 100° C., and the dried moisture is condensed in the form of droplets and discharged.

As such, when removing the dust of the dry exhaust gas containing a large amount of dust and moisture condensed in the form of droplets, the centrifugal dust collector and the filter dust collector have a problem that the filter cloth may be sealed due to the dry exhaust gas in a wet atmosphere. .

In order to remove dust in the sludge drying process using an indirect heat source currently in operation, the centrifugal dust collector and filter dust collector are heated with separate heat sources to adjust the temperature of the dry exhaust gas above the dew point to remove dust. As a separate energy is supplied to increase the temperature of the exhaust gas, there is a problem in that the operating cost increases.

In addition, supplements (mainly sawdust), which are essentially added when sludge is dried into solid fuel, require a suitable dust removal device differentiated from the dust removal device applied in the solid fuel production process.

For this reason, the configuration of the dust removal device for collecting and removing dust generated in the sludge drying process by the conventional indirect heat source becomes complicated, and there is a problem in that the time, human, and economic costs used for maintenance increase.

In order to solve this problem, the present invention uses a hybrid wet electrostatic precipitator to simultaneously remove adhesive fine dust and droplets generated in the indirect heat source method sludge dry solid fuel production process, and reduce pressure loss of a large amount of dry exhaust gas. It can be treated and the amount of wastewater generated can be reduced by applying the automatic discharge function of the collected dust.

2 is a view for explaining the dust removal principle of the wet electrostatic precipitator.

As shown in Fig. 2, a wet electrostatic precipitator (WESP) forms an electric field together with a discharge electrode that charges dust particles in a gas containing dust by corona discharge and the discharge electrode is charged as a negative electrode by the discharge electrode. A dust collecting electrode for collecting particles is included.

The discharge electrode is usually charged with a negative electrode, and is made of a steel wire to form an electric field with the dust collecting electrode to collect the charged dust.

The dust collecting electrode is usually filled with an anode and is manufactured using a material having corrosion resistance as washing water is constantly supplied.

Such a wet electrostatic precipitator separates airborne particles including droplets in the gas from the gas by using a Coulomb force according to an electrical charge.

Here, the difference between the dry electrostatic precipitator and the wet electrostatic precipitator lies in the method of removing the collected dust.

In other words, the dry electrostatic precipitator is a method of dropping dust by giving blows and vibrations to the dust collecting plate where the dust is collected. As the film was formed, it was difficult to treat the dust, such as lowering the discharge efficiency and generating a back corona of the dust collecting plate.

On the other hand, in the hybrid wet electric dust collector 60 according to the present embodiment, washing water is sprayed on the dust collecting electrode and the washing water is rotated and descended to form a continuous water film, and dust particles and droplets are collected in the water film and flowed downward. It is possible to remove the collected dust by going down. And the hybrid wet electrostatic precipitator 60 does not require a blow and vibration device applied to the dry electrostatic precipitator. In addition, the hybrid wet electric dust collector 60 can always achieve a strong electric field without contamination due to dust collected by the water film formed on the dust collecting plate.

Next, the configuration of a hybrid wet electric dust collector according to a preferred embodiment of the present invention will be described in detail with reference to FIGS. 3 to 5 .

3 is a block diagram of a hybrid wet electric dust collector according to a preferred embodiment of the present invention, FIG. 4 is an enlarged view of the dust collecting module shown in FIG. 3, and FIG. 5 is a cross-sectional view and a portion of the dust collecting module shown in FIG. is an enlarged view.

Fig. 5 (a) is a plan view of the dust collecting module, and Fig. 5 (b) is a partially enlarged view of the dust collecting electrode and the vane provided on the upper end of the dust collecting module.

As shown in FIG. 3 , a hybrid wet electric dust collector (hereinafter abbreviated as 'dust collector') 60 according to a preferred embodiment of the present invention is used for drying the first dryer 30 or the second dryer 40 . A first dust collecting unit 61 that receives a gas containing dust generated in the process and collects primary dust, a second dust collecting unit 62 that collects secondary dust from the gas from which dust has been partially removed in the first dust collecting unit 61, and a second It includes a discharge unit 63 for discharging the dust collected in the first dust collecting unit 61 and the second dust collecting unit 62 .

Each of the devices described above may be installed inside the casing 64 that each forms an outer shape.

The first dust collecting unit 61 may include a centrifugal dust collector that receives a gas containing dust generated during the drying process and rotates it to collect the dust using centrifugal force.

That is, the first dust collector 61 may include one or more centrifugal dust collectors 611 and a chamber 612 in which a space in which each centrifugal dust collector 611 is installed is provided in order to improve dust collection efficiency.

A supply pipe 613 to which a gas containing dust is supplied is connected to one side of the chamber 612 , and the gas supplied to the chamber 612 is supplied through the upper end of each centrifugal dust collector 611 inside each centrifugal dust collector 611 . can be transmitted to

A hopper 614 for temporarily storing the dust separated from the gas and collected is provided at a lower portion of each centrifugal dust collector 611, and a control unit for controlling the operation of each device provided in the dust collector 60 at the lower end of the hopper 614 An ejector 615 for discharging the dust temporarily stored in the hopper 614 to the discharge unit 63 according to a control signal (not shown) may be provided.

The control unit may be provided as a main control unit of the sludge fuel conversion system 10 or may be communicatively connected to the main control unit.

The ejector 615 is installed at the lower end of the hopper 614, and may open and close to discharge or block the dust temporarily stored in the hopper 614 according to the control signal.

Of course, when the dust collector 60 is driven, the ejector 615 may always maintain an open state to continuously discharge the dust, and may selectively close according to the control signal if necessary.

On the other side of the chamber 612 , a delivery hole 616 for transferring the gas from which the dust has been partially removed to the second dust collecting part 62 is formed, and between the delivery hole 616 and the second dust collecting part 62 , the gas is supplied to the second A transmission pipe (not shown) for delivering to the dust collecting unit 62 may be connected.

That is, one end of the delivery pipe may be connected to the delivery hole 616 , and the other end of the delivery pipe may be connected to the supply hole 626 formed on the lower side of the second dust collecting part 62 .

As described above, the second dust collector 62 may be provided as a wet electric dust collector that charges dust particles in a gas containing dust by corona discharge and collects negatively charged particles.

In detail, as shown in FIGS. 3 to 5, the second dust collecting unit 62 receives gas through the delivery pipe, and a discharge electrode ( 622 ) and a plurality of dust collecting modules 621 including a dust collecting electrode 623 that forms an electric field together with the discharge electrode 622 to collect negatively charged particles by the discharge electrode 622 .

Each dust collecting module 621 has a discharge electrode 622 formed in a substantially bar shape and disposed along the vertical direction, and a space in which the gas containing dust moves while the discharge electrode 622 is disposed therein is formed, approximately It may include a dust collecting electrode 623 formed in a cylindrical shape.

Therefore, the dust in the gas is separated from the gas by the Coulomb force according to the electrical charge.

In addition, a spray nozzle 624 for spraying washing water in order to collect dust contained in gas and clean the dust collecting electrode 623 may be installed at the upper end of each dust collecting module 621 .

The injection nozzles 624 may be provided in a number corresponding to each dust collection module 621 and installed on a washing water supply pipe for supplying washing water.

The spray nozzle 624 may spray the washing water supplied from the water tank 629 described below toward the upper end of the inner space of each dust collecting module 621 according to a control signal from the controller.

Of course, the spray nozzle 624 may be further installed at the lower end of each dust collecting module 621 so as to spray the washing water to the lower end of each dust collecting module 621 .

That is, in the injection nozzle 624 , as the gas containing dust supplied through the supply hole 626 formed on the lower side of the second dust collecting unit 62 moves upward through each dust collecting module 621 , each dust collecting It may be installed above and below the module 621 and above the gas rectifier 628 to be described below, respectively.

A plurality of vanes 625 may be formed in the inside of each dust collecting module 621 along a spiral shape so that the washing water and the dust collected by the washing water are rotated and descended.

3 and 4, the vane 625 is shown only at the upper end of the inner space of the dust collecting electrode 623, but the vertical length of the vane 625 depends on the specifications of the dust collecting module 621 and the dust collecting electrode 623, etc. It can be variously changed.

On the other hand, the gas introduced into each dust collecting electrode 623 through the lower end of each dust collecting electrode 623 moves from the lower part to the upper part through the space inside each dust collecting electrode 623, and the discharge electrode 622 and the dust collecting electrode ( 623) and the washing water, and then discharged through the upper end of the collecting electrode 623.

That is, the dust contained in the gas is separated from the gas by the discharge electrode 622 and the dust collecting electrode 623 in the process of moving upward through the inner space of the dust collecting electrode 623 , and is collected by the dust collecting electrode 623 .

And the dust collected by the dust collecting electrode 623 is collected in the washing water sprayed from the spray nozzle 624 to the dust collecting electrode 623, and the washing water in which the dust is collected is a plurality of spirally formed on the dust collecting electrode 623. It descends while rotating along the vane 625 of the.

So, the second dust collecting unit 62 separates the dust contained in the gas by using the plurality of dust collecting modules 621, collects dust by spraying washing water, and collects the dust collected washing water inside the dust collecting module 621. It is lowered while rotating along the vane 625 installed in the .

As such, the present invention removes dust having a large specific gravity primarily by applying a first dust collector including one or more centrifugal dust collectors to pre-treat the exhaust gas inside the wet electric dust collector to increase the dust removal efficiency, and the wet electric dust collector Even fine dust can be removed through the second dust collecting unit provided with

In the present invention, a spiral-shaped vane is formed on the dust collecting electrode to which dust is attached, and the washing water for cleaning the dust collecting electrode is rotated and lowered to increase the time staying inside the dust collecting module, and the surface of the dust collecting electrode is cleaned evenly to improve the cleaning efficiency. can increase

Again in FIG. 3 , an insulating part 627 electrically insulating between each discharge electrode 622 and the upper end of the second dust collecting part 62 may be provided on the upper portion of the second dust collecting part 62 .

The insulating part 627 may be manufactured using an insulating material, and may insulate between the discharge electrode 622 and the upper casing 65 in which the second dust collecting part 623 is disposed.

In addition, a gas rectifier 628 for rectifying the gas containing dust and a water tank 629 for storing the washing water and the dust collected by the washing water may be provided under the dust collecting module 621 .

A plurality of fillers having a preset particle size may be filled in the gas rectifier 628 to increase the contact area with the gas to maintain a uniform flow rate.

An injection nozzle 624 for spraying washing water into the gas containing dust supplied through the supply hole 626 may be installed at an upper portion of the gas rectifier 628 .

In the water tank 629 , the washing water stored therein is supplied to the spray nozzle 624 , and the washing water collecting dust in the process of cleaning the dust collecting electrode 623 returns to the water tank 629 .

Again in FIG. 2 , the discharge unit 63 is provided under the first and second dust collecting units 61 and 62 , and the dust collected in the first and second dust collecting units 61 and 62 is discharged to the outside of the dust collector 60 . discharge

The dust discharged by the discharge unit 63 may be supplied to the mixer in a sludge state, and may be molded into a solid fuel through a drying process. Of course, the dust discharged from the discharge unit 63 may be supplied back to the first dryer 30 or the second dryer 40 according to the moisture content.

To this end, the discharge unit 63 includes a rotating shaft 631 on which a blade for moving dust is formed on the outer peripheral surface and a driving module 632 for generating a driving force to rotate the rotating shaft 631 .

A discharge pipe for discharging the dust collected may be connected to one side of the discharge unit 63 .

The discharge pipe is directly connected to the mixer 20, or is connected to a separate storage tank, and the dust in the sludge state stored in the storage tank is delivered to the mixer 20 using a vehicle or a cart equipped with a storage container. have.

The driving module 632 may be provided as an electric motor, a pneumatic motor, or an electric motor driven according to a control signal of the controller.

A rotation shaft 631 may be connected to the output shaft of the driving module 632 .

On the outer peripheral surface of the rotating shaft 631, the first wing part 633 and the second dust collecting part 62 for moving the dust discharged from the hopper 614 of the first dust collecting part 61 to the discharge pipe side are discharged from the water tank 629 A second wing portion 634 to move the dust may be formed.

The first wing part 633 may be disposed under the hopper 614 of the first dust collecting part 61 , and the second wing part 634 may be disposed inside the water tank 629 of the second dust collecting part 62 .

For example, the first wing portion 633 and the second wing portion 634 may each be formed in a spiral shape.

Here, the first wing portion 633 and the second wing portion 634 may be formed at different intervals.

That is, as the second wing portion 634 moves the dust collected by the second dust collecting portion 62 , it may be formed at a wider interval than the first wing portion 633 .

On the other hand, the first wing part 633 is a second wing part 634 so that the dust discharged from the second dust collecting part 62 and moving toward the discharge pipe and the dust discharged from the first dust collecting part 61 can be moved together. ) can be formed at a narrow interval compared to

In addition, the first and second wing portions 633 and 634 may each be formed with a narrower interval between the wings toward the discharge pipe.

As described above, the present invention may provide a discharge unit for automatically discharging dust under the first and second dust collecting units, and recirculate the dust collected to the mixer.

Accordingly, in the present invention, by drying and recycling the dust collected in the sludge drying process, the entire amount of the sludge can be recycled and the amount of wastewater generated can be reduced.

Meanwhile, in the present embodiment, it has been described that the dust discharged from the dust collector 60 is supplied to the first dryer 30 or the second dryer 40 , but the present invention is not necessarily limited thereto.

That is, the present invention recirculates the dust discharged from the dust collector 60 to the mixer 20, and further mixes the dust recycled together with the sludge 11 and the additive 12 in the mixer 20 to mix the first and second 2 It can be supplied to the dryer (30, 40).

Of course, the present invention may be changed to be directly supplied to the first dryer 30 or the second dryer 40, or to be supplied to the first and second dryers 30 and 40, respectively, depending on the moisture content of the dust collected.

Next, an operating method of the hybrid wet electric dust collector according to a preferred embodiment of the present invention will be described in detail with reference to FIG. 6 .

6 is a process diagram illustrating step-by-step an operation method of a hybrid wet electric dust collector according to a preferred embodiment of the present invention.

In step S10, the first and second dryers 30 and 40 of the sludge fuel conversion system 10 first and second dry the sludge mixed in the mixer through thermal drying method and bio-drying, respectively, and generated in the drying process The gas containing dust is supplied to the dust collector 60 (S12).

Then, one or more centrifugal dust collectors 611 provided in the first dust collecting unit 61 of the dust collector 60 are driven to rotate the gas to primarily collect dust contained in the gas (S14).

At this time, the primary collected dust is temporarily stored in the hopper 614 provided under the first dust collecting unit 61 , and discharged to the lower discharge unit 63 during the opening operation of the discharger 615 .

In addition, the plurality of dust collecting modules 621 provided in the second dust collecting unit 62 of the dust collecting device 60 uses a discharge electrode 622 and a dust collecting electrode 623 to remove the dust from the gas in the first dust collecting unit 61 . The fine dust is separated and collected (S16), and washing water is sprayed using the spray nozzle 624 to collect the dust separated from the gas and collect the secondary dust (S18).

At this time, the secondary dust collected is sludge as it is collected by the washing water, and may be stored in the water tank 629 in a sludge state.

Here, in the inner space of the water tank 629, the dust in the sludge state is disposed at the lower part by its own weight, and the washing water including some dust is disposed in the upper part of the dust in the sludge state.

Accordingly, by the rotational operation of the rotating shaft 631, the second wing portion 633 moves only the dust in the sludge state disposed in the lower portion of the inner space of the water tank 629 to the discharge pipe side, and the washing water again passes through the washing water supply pipe. It may be supplied to the injection nozzle 624 through.

For this reason, in the present invention, as the collected dust is discharged in a sludge state, the amount of use of fresh water used for cleaning dust and dust collecting electrodes can be minimized.

Then, in step S20 , the driving module 632 provided in the discharge unit 63 is driven according to a control signal of the controller to generate driving force, and the rotating shaft 631 rotates by the driving force generated by the driving module 632 .

So, the primary and secondary dust collected is moved to the discharge pipe side by the first and second wing parts 633 and 634 formed on the outer surface of the rotation shaft 631, respectively, and discharged, and the discharge pipe is discharged by mixing the discharged dust into the mixer 20 recycled to

Then, the mixer 20 may additionally mix the recirculated dust together with the sludge 11 and the additive 12 and supply it to the first and second dryers 30 and 40 .

Of course, the present invention is directly supplied to the first dryer 30 or the second dryer 40 according to the moisture content of the discharged dust, or any one or more of the mixer 20 and the first and second dryers 30 and 40 can also be supplied separately.

Therefore, the first or second dryers 30 and 40 dry the sludge mixed in the mixer 20, and the molding machine 50 pressurizes the dried sludge to form a solid fuel.

Through the process as described above, the present invention can collect and recycle the dust generated in the sludge dry solid fuel production process.

Accordingly, the present invention can process a large amount of gas with very high dust collection efficiency for fine particles and low pressure loss.

In addition, the present invention can collect smoke, fumes, droplets, etc., allows a design free of specific resistance and adhesion of dust particles, can be designed at a treatment gas temperature below the dew point, and wastewater through automatic discharge of collected dust generation can be reduced.

In addition, the present invention is suitable for the sludge solid fuel production system compared to other dust removal facilities because it is easy to remove the dust of the wet gas containing a large amount of dust.

In addition, in order to increase the dust removal efficiency, the present invention applies a first dust collector provided with a centrifugal dust collector and a second dust collector provided with a wet electric dust collector to primarily collect dust with a large specific gravity, and secondly to collect fine dust. have.

In particular, the present invention applies a dust collecting electrode and a vane through which dust moves in the dust collecting module provided in the second dust collecting unit, and rotates and lowers the collected dust by spraying washing water to increase the time to soften inside the dust collecting module, and to collect dust It is possible to increase the cleaning efficiency by uniformly cleaning the electrode surface.

In addition, when the present invention is applied to the sludge dry solid fuel production process, it is possible to solve the problem of efficiency decrease due to the dust load of the conventional odor reduction equipment, and it is possible to reduce the consumption of chemicals supplied to the odor reduction equipment, and the odor reduction equipment It is also possible to prevent civil complaints due to odor problems in advance through normal operation.

In addition, the present invention can greatly reduce fine dust emissions when using industrial fuel due to environmental issues such as fine dust, and create social value through technology development related to biomass energy industry, which is expected to be fiercely competitive.

In addition, the present invention can establish a natural circulation energy production system according to the environmental improvement effect such as fine dust and the conversion of biomass, which has been recognized as waste, into energy, and energy independence according to the conversion of biomass into energy in island and rural areas system can be established.

In addition, the present invention can contribute to reducing the cost of drug consumption by solving the problem of reducing the efficiency of the odor reduction facility, and converting the sewage sludge into energy through the solid fuel conversion process supply project to local governments possessing sewage treatment plants and consumers.

In addition, the present invention contributes to reducing the amount of fine dust generated by reducing ammonia emission from odor reduction facilities, reducing the cost of importing coal when converting domestic sewage sludge into a solid fuel and applying a thermal power plant, and using coal as a substitute for solid fuel in sewage sludge. can be obtained

Although the invention made by the present inventors has been described in detail according to the above embodiments, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the gist of the present invention.

The present invention is applied to a hybrid wet electric dust collector that collects and recycles dust generated in a sludge dry solid fuel production process and a sludge fuel conversion system technology to which the same is applied.

10: Sludge fuel conversion system
11: Sludge 12: Additives
20: mixer 30: first dryer
40: second dryer
50: molding machine
60: hybrid wet electrostatic precipitator
61: first dust collecting unit
64: casing 65: upper casing
611: centrifugal dust collector 612: chamber
613: supply pipe 614: hopper
615: ejector 616: transmission hole
62: second dust collecting unit
621: dust collection module 622: discharge electrode
623: dust collecting electrode 624: spray nozzle
625: vane 626: supply hole
627: insulation part 628: gas rectifier
629: tank
63: discharge unit
631: rotation shaft 632: drive module
633: first wing portion 634: second wing portion
64: casing 65: upper casing
70: environmental equipment

Claims (7)

A first dust collecting unit that receives a gas containing dust generated in the process of drying sludge in a dryer provided in the sludge fuel conversion system and collects primary dust;
a second dust collecting unit for collecting secondary dust from the gas from which the dust has been partially removed in the first dust collecting unit; and
and a discharge unit for discharging the dust collected in the first dust collecting unit and the second dust collecting unit,
The dust discharged from the discharge unit is discharged through the discharge pipe and recirculated to the mixer of the sludge fuel conversion system,
The first dust collecting unit includes one or more centrifugal dust collectors that rotate a gas containing dust and collect dust using centrifugal force;
A chamber for supplying gas containing dust to each centrifugal dust collector and
Including a hopper for temporarily storing the primary dust collected,
A supply pipe to which a gas containing dust is supplied is connected to one side of the chamber,
A delivery hole is formed on the other side of the chamber to which a delivery pipe for delivering a gas from which dust has been partially removed to the second dust collecting unit is connected,
At the lower end of the hopper, an ejector that opens and closes to discharge or block the dust stored in the hopper to the discharge unit is provided according to a control signal from a control unit for controlling the operation of each device provided in the hybrid wet electric dust collector,
The second dust collecting unit is supplied with gas through the delivery pipe, and a discharge electrode for charging dust particles in the gas containing dust by corona discharge;
A plurality of dust collecting modules including a dust collecting electrode forming an electric field together with the discharge electrode to collect negatively charged particles by the discharge electrode;
A plurality of spray nozzles for spraying washing water to the plurality of dust collecting modules
A water tank that stores the washing water and the dust collected by the washing water,
an insulating part electrically insulating between the discharge electrode and the upper end of the second dust collecting part; and
A gas rectifier for rectifying a gas containing dust,
The dust collecting electrode is formed in a cylindrical shape,
In the dust collecting electrode, a plurality of vanes are spiraled to increase the cleaning efficiency of evenly cleaning the surface of the dust collecting electrode by rotating and descending the dust collected secondarily by washing water and washing water to increase the time it stays inside the dust collecting module. formed in the shape
The washing water stored in the water tank is supplied to the spray nozzle,
The washing water sprayed on the dust collecting electrode collects dust and returns to the water tank,
A plurality of fillers having a preset particle size are filled in the gas rectifier to increase the contact area with the gas to maintain a uniform flow rate,
The discharge unit includes a rotary shaft on which a blade for moving dust is formed on the outer peripheral surface and
and a driving module that generates a driving force to rotate the rotating shaft,
On the outer surface of the rotation shaft, the first wing portion for moving the dust discharged from the hopper of the first dust collecting unit toward the discharge pipe;
A second wing unit for moving the dust stored in the water tank of the second dust collecting unit is formed,
The hybrid wet electric dust collector, characterized in that the first wing portion and the second wing portion are formed at different intervals depending on the object to be moved. delete delete delete delete delete In the sludge fuel conversion system to which the hybrid wet electric dust collector according to claim 1 is applied,
A mixer that mixes sludge and additives to produce a primary mixture,
A first dryer for drying the first mixture supplied from the mixer to a first moisture content by bio-drying;
a second dryer for producing a dry mixture of a second moisture content by heating and drying the first mixture of the first moisture content;
a molding machine for producing solid fuel by pressure molding the dry mixture; and
and a hybrid wet electric dust collector for collecting dust by separating the dust generated during the drying process of the first and second dryers from the gas,
The sludge fuel conversion system to which the hybrid wet electric dust collector is applied, characterized in that the dust collected in the hybrid wet electric dust collector is recycled to at least one of the mixer and the first and second dryers to be recycled as solid fuel.

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