KR101389475B1 - The optimized reaction efficiency of air pollution control facilities - Google Patents

Abstract

The present invention relates to an air pollution control facility with optimized reaction efficiency that is disposed to be connected to a waste heat boiler and reduces exhaust gas. The present invention includes a semi-dry reaction tower in which an inner portion through which exhaust gas passes is configured to be separated into an inside chamber and an outside chamber by a case and a cylindrical partition wall formed in the case, an inlet through which the exhaust gas flows being formed at the center of an upper portion of the inside chamber and an outlet being formed in an upper portion of the outside chamber so that the exhaust gas is discharged; a guide vane portion that has an upper guide vane which is formed at the inlet of the semi-dry reaction tower and a lower guide vane formed in a lower portion of the outside chamber; a plurality of slaked lime slurry spray nozzles that are disposed at an upper edge of the inside chamber of the semi-dry reaction tower to supply slaked lime slurry; a filter dust collector that is arranged apart on one side of the semi-dry reaction tower to filter pollutants of the exhaust gas which passes through the semi-dry reaction tower; connection piping that has a vertical connection pipe which is disposed to be connected in a vertical direction to the outlet of the semi-dry reaction tower with a venturi having a decreasing diameter formed therein and a horizontal connection pipe which is formed integrally with the vertical connection pipe and is connected horizontally to the filter dust collector; a pollutant treatment unit that has an activated carbon spray unit which supplies activated carbon to an upper side of the venturi configured in the vertical connection pipe and a slaked lime spray unit which supplies slaked lime; and a discharge unit that uses an induced draft fan which takes in the exhaust gas to discharge the exhaust gas passing through the filter dust collector to the atmosphere through a chimney. [Reference numerals] (AA) Slaked lime slurry supply tank; (BB) Slaked lime slurry supply pump; (CC) Air compressor; (DD) Waste heat boiler; (EE) Vibrator; (FF) Rotary valve; (GG,HH) Air dryer

Description

The optimized reaction efficiency of air pollution control facilities

The present invention relates to an air pollution prevention facility with optimized reaction efficiency. More specifically, the quasi-dry reaction tower is divided into an inner chamber in which an upper guide vane is formed and an outer chamber in which a lower guide vane is formed through a cylindrical partition. As a result, the residence time of the exhaust gas and the slaked lime slurry passing through the outer chamber is increased, and the rotating directions of the upper and lower guide vanes are opposite to each other, so that the slaked lime slurry is mixed at a uniform concentration. Sufficient mixing reaction can occur and dioxins, heavy metals and acid gases contained in the exhaust gas are efficiently collected in the bag filter by venturi installed in the vertical connection pipe and activated carbon and slaked lime which are respectively supplied in powder form from the top of the venturi. The present invention relates to an air pollution prevention facility with optimized reaction efficiency.

In general, waste (combustible waste such as domestic waste, industrial waste, and sludge) may be disposed of in a specific area or incinerated. However, when the waste is buried, a large amount of waste may be In addition to the problem of securing the area, land pollution and environmental pollution of the ground and groundwater is a problem, and in recent years, a method of incineration of flammable waste is being adopted.

In addition, incinerators for incineration of combustible wastes such as household waste, industrial waste, sludge, solid fuel (SRF), etc., are manufactured and used in various forms according to their use, and most of them are incineration processes. The main components are structures that can be recycled to heating or industrial hot water by using waste heat generated from.

On the other hand, the method by incineration requires a thorough pollution prevention facility because air pollutants are generated. For this purpose, the waste incineration unit, together with the incinerator, recovers the heat of the exhaust gas and the pretreatment facility that uniformly supplies waste to the incinerator. Waste heat boiler that cools the exhaust gas, and acidic substances such as hydrogen chloride (HCL), sulfur oxides (SOx), etc. contained in the exhaust gas, dust, heavy metal nitrogen oxides (NOx), dioxins, etc. before being released into the atmosphere Emission gas treatment equipment to remove, such a configuration can be applied to the crematory and animal furnace in the same field as the incinerator.

In addition, the configuration of treating and recycling waste using an incinerator can be known through a waste treatment and recycling system using a fluidized bed incinerator, which is published in Korean Patent Publication No. 10-2012-0018938.

However, in the waste treatment and recycling system using the conventional fluidized bed incinerator, the chamber of the semi-dry reaction tower for adsorption and removal of fly ash contained in the exhaust gas by calcining is not only a single structure, but also the inside of the semi-dry reaction tower. There was a problem that can not achieve the effective removal of contaminants because there is no composition for promoting the reaction efficiency.

Therefore, the present applicant has developed an air pollution prevention facility that optimizes the reaction efficiency that can increase the air pollution prevention effect by maximizing the reaction efficiency in the reaction tower.

An object of the present invention is to separate the interior of the quasi-dry reaction tower into an inner chamber in which the upper guide vane is formed and an outer chamber in which the lower guide vane is formed through the cylindrical partition wall, and the exhaust gas and the slaked lime slurry pass through the inner and outer chambers. By increasing the residence time, it is to provide an air pollution prevention facility with optimized reaction efficiency that can increase the efficiency of removing gaseous pollutants contained in exhaust gas.

In addition, the present invention is that the rotation direction of the upper and lower guide vanes are formed in opposite directions, so that the rotational direction of the exhaust gas passing through the inner and outer chambers is not changed so that the slaked lime slurry can be mixed at a uniform concentration. In addition, since the reaction of the exhaust gas passes through the inner and outer chambers sequentially, the second reaction mixture takes place, so even if the length of the semi-dry reaction tower is made short, sufficient reaction time by the slaked lime slurry is obtained. The purpose is to provide an air pollution prevention facility with optimized efficiency.

In addition, the present invention is formed in the vertical connection pipe installed in the vertical direction between the quasi-dry reaction tower and the bag filter is narrowed venturi, the upper portion of the venturi is activated carbon and calcined lime is distributed and supplied to each exhaust gas Since the mixture of activated carbon and slaked lime is evenly passed through the venturi rapidly, it provides an air pollution prevention facility that optimizes the reaction efficiency by which dioxin, heavy metal and acid gas contained in exhaust gas are removed from the bag filter. There is a purpose.

The present invention for achieving the above object is configured to separate the inner chamber and the outer chamber through which the exhaust gas passes through the case and the cylindrical partition formed inside the case, the exhaust gas in the upper center of the inner chamber A quasi-dry reaction tower having an inlet formed therein and an outlet through which exhaust gas is discharged above the outer chamber; A guide vane comprising an upper guide vane formed at an inlet of the semi-dry reaction tower and a lower guide vane formed at a lower portion of the outer chamber; A slaked lime slurry spray nozzle which is installed at a plurality of upper edges of the inner chamber of the quasi-dry reaction tower to supply slaked lime slurry; A filter dust collector disposed to one side of the quasi-dry reaction tower to filter contaminants of exhaust gas passing through the quasi-dry reaction tower; A connecting pipe consisting of a vertical connecting pipe formed in a narrow diameter inside the venturi is connected to the outlet of the semi-dry reaction tower in a vertical direction, and a horizontal connecting pipe formed integrally with the vertical connecting pipe and connected horizontally to the filter dust collector. ; A contaminant treatment unit including an activated carbon spraying unit for supplying activated carbon to the upper side of the venturi configured in the vertical connection pipe, and a slaked lime spraying unit for supplying slaked lime; It provides an air pollution prevention facility with optimized reaction efficiency characterized in that consisting of; an exhaust unit for exhausting the exhaust gas passed through the bag filter to the atmosphere through a stack using a manned blower to suck the exhaust gas.

In the air pollution prevention facility optimized the reaction efficiency of the present invention, the interior of the semi-dry reaction tower is separated into an inner chamber formed with an upper guide vane and an outer chamber formed with a lower guide vane through a cylindrical partition wall to pass through the inner chamber. Since the residence time of the exhaust gas and the slaked lime slurry is increased, the efficiency of removing gaseous pollutants contained in the exhaust gas is increased.

In addition, the present invention is that the rotation direction of the upper and lower guide vanes are formed in opposite directions, so that the rotational direction of the exhaust gas passing through the inner and outer chambers is not changed so that the slaked lime slurry can be mixed at a uniform concentration. In addition, since the mixing reaction occurs twice in the course of passing the exhaust gas through the inner and outer chambers sequentially, even if the length of the semi-dry reaction tower is made short, sufficient reaction time by the slaked lime slurry can be secured. There is this.

In addition, the present invention is formed in the vertical connection pipe installed in the vertical direction between the quasi-dry reaction tower and the bag filter is narrowed venturi, the upper portion of the venturi is activated carbon and calcined lime is distributed and supplied to each exhaust gas Since the mixture of activated carbon and slaked lime is made evenly in the process of quickly passing through Venturi, it is a useful invention that the efficiency of removing dioxins, heavy metals and acid gases contained in the exhaust gas from the bag filter is increased.

Figure 1 is a schematic diagram showing an air pollution prevention facility optimized the reaction efficiency of the present invention.
Figure 2 is an enlarged view showing the guide vane portion and the slaked lime slurry spray nozzle and the vertical connection pipe connected to the semi-dry reaction tower of the present invention.
Figure 3 is a plan view showing a semi-dry reaction tower of the present invention.
Figure 4 is an enlarged view showing a state in which activated carbon spray nozzles and slaked lime spray nozzles are installed on the venturi formed in the vertical connection pipe of the present invention.
5 is a velocity vector display of the exhaust gas passing through the quasi-dry reaction column of the present invention.
6 to 9 are diagrams showing the concentration of the slaked lime sprayed in the semi-dry reaction tower of the present invention through the heat flow analysis in accordance with the direction of the exhaust gas.

Hereinafter, the structure of the present invention will be described.

The present invention relates to an air pollution prevention facility (100) that optimizes the reaction efficiency to reduce the exhaust gas generated by being connected to the waste heat boiler connected to an incinerator or crematory and an animal furnace (not shown) for recycling. 1 to 4, the semi-dry reaction tower 10, the guide vane portion 20, the slaked lime slurry spray nozzle 30, the bag filter 40, the connecting pipe 50, pollution It consists of a material processing part 80 and the exhaust part 90.

First, the semi-dry reaction tower 10 is connected to the waste heat boiler through a conventional pipe to remove gaseous contaminants contained in the exhaust gas introduced from the waste heat boiler, and the case having the inlet 17 formed thereon. (13), and the lower portion of the case 13 is a conventional dust collecting unit 19 for collecting the filtered contaminants.

In addition, a chamber through which exhaust gas passes is formed in the case 13 of the quasi-dry reaction tower 10. The chamber is formed at the center through a cylindrical partition 15 formed in the case 13. The chamber 11 and the outer chamber 12 which is formed on the outside of the inner chamber 11 is separated, wherein the cylindrical partition 15 is exhaust gas passing through the inner chamber 11 is the outer chamber 12 The lower part is formed to be opened so that it can be easily introduced into.

In addition, an inlet 17 and an outlet 18 are formed in the quasi-dry reaction tower 10, and the inlet and outlets 17 and 18 may allow the exhaust gas to stay in the quasi-dry reaction tower 10 for a long time. In addition, the inlet 17 is formed in the upper center of the inner chamber 11 and the outlet 18 is formed in the upper one side of the outer chamber 12 so that the passage path can be long, and accordingly, After the exhaust gas flowing into the inlet descends and passes through the inner chamber 11, it acts as though it is temporarily suspended in the process of ascending through the outer chamber 12. Effective removal of contaminants in the bed is achieved.

Second, the guide vane 20 is configured to remove the pollutants by uniformly mixing the slaked lime slurry in the exhaust gas passing through the inner and outer chambers (11, 12) of the semi-dry reaction tower (10). The upper guide vane 21 is formed at the inlet 17 of the quasi-dry reaction tower 10, and the lower guide vane 22 is formed below the outer chamber 12.

Therefore, the exhaust gas flowing into the inlet 17 is introduced while rotating rapidly along the upper guide vane 21, and then mixed with the slaked slurry in the process of being discharged to the outlet 18 through the lower guide vane 22. This is done evenly.

In addition, in the present invention, it is preferable to form the rotation direction of the upper and lower guide vanes 21 and 22 configured in the guide vane portion 20 in opposite directions, which is rotated through the upper guide vane 21. This is to achieve an even distribution of the slaked lime slurry by preventing the rotational direction of the exhaust gas and the slaked lime slurry from passing through the lower guide veil 22.

In addition, the outlet 18 formed in the quasi-dry reaction tower 10 is formed at the edge of the case 13 so that the rotational direction of the exhaust gas and the slaked lime slurry rotated in the outer chamber 12 may be discharged without being changed. It is preferable that it is formed extending in the horizontal direction, according to this, the smooth flow of the exhaust gas is made is evenly distributed and mixed without the slurry slurry.

Third, the slaked lime slurry spray nozzle 30 is configured to spray the slaked lime slurry into the semi-dry reaction tower 10 as described above, the upper edge of the inner chamber 11 around the inlet (17) It is installed in two or more than two pieces.

In addition, the slaked lime slurry spray nozzle 30 is connected to the ordinary slaked lime slurry supply tank and the slaked lime slurry supply pump and the air compressor is configured to spray the slaked lime slurry into the inner chamber (11).

Fourth, the bag filter 40 is disposed to one side of the quasi-dry reaction column 10 to filter out sulfur oxides contained in the exhaust gas, acidic contaminants such as hydrogen chloride and solid contaminants such as fine dust. Thus, a conventional bag 41 for filtering contaminants is constituted.

In addition, the upper portion of the filter dust collector 40 is supplied with compressed air through a conventional air dryer is configured a conventional air header 43 to shake off the dust accumulated in the filter dust collector 40, the lower portion is shaken off The normal dust collecting part 45 for collecting dust is comprised.

Fifth, the connecting pipe 50 is a flow passage of the exhaust gas connecting the quasi-dry reaction tower and the filter dust collector to each other, and forms a venturi 51 having a narrow diameter therein so that the outlet of the quasi-dry reaction tower 10 ( 18) and a vertical connecting pipe 53 installed in a vertical direction and integrally formed in the vertical connecting pipe 53 and a horizontal connecting pipe 55 horizontally connected to the bag filter 40.

Sixth, the contaminant treatment unit 80 is installed in the connection pipe 50 to easily filter out the solid contaminants in the bag filter 40, the venturi 51 configured in the vertical connection pipe (53) It consists of an activated carbon spraying unit 60 for supplying activated carbon to the upper side of), and a slaked lime spraying unit 70 for supplying slaked lime.

Here, the activated carbon spray unit 60 and the activated carbon spray nozzle 61 is installed on the upper side of the vertical connection pipe 53, which is an upper portion of the venturi 51 to supply the activated carbon from the venturi 51, The dispersing plate 63 is installed at the end of the activated carbon spray nozzle 61, and the activated carbon in the form of powder sprayed from the activated carbon spray nozzle 61 is formed inside the vertical connection pipe 53 through such a configuration. It distributes and distributes evenly.

Then, the activated carbon supply nozzle 65 and the activated activated carbon supplied by the activated carbon supply device 65 and the normal activated carbon supply device 65 for transporting and supplying the activated carbon stored in a predetermined amount so that the activated carbon in the powder form to the activated carbon spray nozzle 61 An activated carbon supply blower 67 flowing into the vertical connection pipe 53 is connected to the activated carbon spray nozzle 61.

In addition, the calcined lime spraying unit 70 is installed to face the activated carbon spraying unit 60 so as to uniformly supply powdered calcined lime into the vertical connection pipe 53, similarly to the activated carbon spraying unit 60. A hydrated lime spray nozzle (71) installed in the vertical connection pipe (53) and a dispersion plate (73) installed at the end of the hydrated lime spray nozzle (71), wherein the hydrated lime spray nozzle (71) is a conventional hydrated lime It is configured to be connected to the supply device 75 and the calcined lime supply blower 77.

Seventh, the exhaust unit 90 is configured to exhaust the exhaust gas passing through the filter dust collector 40 to the atmosphere through the stack 93 by using a manned blower 91 for sucking the exhaust gas. It consists of ordinary piping which connects between stacks.

On the other hand, the Applicant gave a change in the concentration of the slaked lime slurry passed through the upper and lower guide vanes (21, 22) distributed in the inner chamber 11 and the outer chamber 12, as shown in FIGS. According to the length of the dry reaction tower 10, the heat flow analysis was divided into four stages from the upper part where the outlet 18 is formed to the lower part where the lower guide vane 22 is installed.

As a result, as shown in the reaction solution concentration distribution (Z = -1), the concentration distribution inside was unbalanced but the concentration distribution outside was very uniform.The reaction solution concentration distribution (Z = -1), (Z = -2), (Z = -3), and as shown in (Z = -4), the concentration of the inner chamber 11 is uniformized downward, and the concentration of the outer chamber 12 is uniformized upward. have.

In other words, the mixing reaction by the slaked lime slurry is sprayed from the slaked lime slurry spray nozzle 30, the homogeneous mixing rate increases as the residence time increases, in the present invention, the inside of the semi-dry reaction tower 10, the outside By constructing the chambers 11 and 12, that is, the double chambers, the homogeneous mixing ratio can be expected to increase even in a shorter length of the semi-dry reaction tower 10. As a result, the secondary effect of allowing room in the installation space can be expected. You can get it.

Hereinafter will be described the operation according to a preferred embodiment of the present invention.

First, when the exhaust gas generated from the waste heat boiler is introduced into the inlet 17 of the semi-dry reaction tower 10 through the pipe, the incoming exhaust gas rotates along the upper guide vane 21 formed in the inlet 17. While flowing in the lower direction of the inner chamber (11).

And, in the slaked lime slurry spray nozzle 30 installed on the upper edge of the quasi-dry reaction tower 10 is a function of spraying the slaked lime slurry into the interior of the inner chamber 11, the slaked lime slurry to the exhaust gas is rotated inlet Since the same rotation as that of the exhaust gas is achieved, the action is gradually evenly distributed during the rotational movement in the lower direction of the inner chamber 11, so that gaseous contaminants contained in the exhaust gas are transferred to the lower dust collector 19. It is easily collected.

In addition, the exhaust gas rotated in the downward direction of the inner chamber 11 is introduced into the outer chamber through the cylindrical partition wall 15 having the lower opening. In this process, the lower guide vane 22 is moved. Secondary mixing of the exhaust gas passing through and the slaked lime slurry is made to evenly distribute the slaked lime slurry.

On the other hand, when flowing from the inner chamber 11 to the outer chamber 12, since the flow of the exhaust gas is in the opposite direction, that is, acting as a moment to be moored by acting in the lower direction to the upper direction, the exhaust gas is The time spent in the quasi-dry reaction tower 10 becomes long, and thus, the gaseous pollutant removal by the slaked lime slurry can be more effectively achieved. In addition, the upper and lower guide vanes 21 and 22 are formed in opposite directions so that the rotational flow of the exhaust gas is not changed by changing the rotational direction of the exhaust gas. It is possible to promote uniform mixing.

In addition, the exhaust gas mixed with the slaked lime in a uniform concentration through the above process is discharged through the outlet 18 of the quasi-dryship reaction tower 10 and introduced into the vertical connecting pipe 53, and the vertical connecting pipe 53 Activated carbon and hydrated lime powder are sprayed evenly on the exhaust gas introduced into the exhaust gas. Since the venturi 51 is formed in the vertical connection pipe 53, the exhaust gas is briefly formed at the top of the venturi 51. The slower and faster conversion of the activated carbon powder and the slaked lime powder into the exhaust gas is achieved by the rapid conversion of the flow through the venturi 51.

Therefore, the exhaust gas introduced into the filter dust collector 40 through the connecting pipe 50 formed of the vertical connecting pipe 53 and the horizontal connecting pipe 55 has activated carbon powder, hydrated lime powder and hydrated lime slurry at uniform concentrations. Since it is mixed, contaminants are effectively removed during the passage of the exhaust gas through the bag filter 40, and contaminants are minimized in the exhaust gas exhausted to the exhaust unit 90.

DESCRIPTION OF SYMBOLS 10 Semi-dry reaction tower 11 Inner chamber 12 Outer chamber 13 Case 15 Bulkhead 17 Inlet 18 Outlet 19 Dust collector
20: guide vane 21: upper guide vane 22: lower guide vane
30: slaked lime slurry spray nozzle
40: dust collector 41: bag 43: air header 45: dust collector
50: connection pipe 51: Venturi 53: vertical connector 55: horizontal connector
60: activated carbon spraying unit 61: activated carbon spray nozzle 63: dispersion plate 65: activated carbon supply device 67: activated carbon supply blower
70: slaked lime injection unit 71: slaked lime injection nozzle 73: dispersion plate 75: slaked lime supply device 77: slaked lime supply blower
80: pollutant treatment unit
90 exhaust portion 91 manned blower 93 stack
100: Air pollution prevention facility with optimized reaction efficiency

Claims (3)

In the air pollution prevention facility connected to the waste heat boiler to reduce the exhaust gas,
The inner chamber 11 and the outer chamber 12 are separated into an inner chamber 11 and an outer chamber 12 through which the exhaust gas passes through the case 13 and the cylindrical partition 15 formed in the case 13. Quasi-dry reaction tower 10 having an inlet 17 through which exhaust gas is introduced, and an outlet 18 through which exhaust gas is discharged above the outer chamber 12;
A guide vane 20 including an upper guide vane 21 formed at an inlet 17 of the quasi-dry reaction tower 10 and a lower guide vane 22 formed at a lower portion of the outer chamber 12;
A slaked lime slurry spray nozzle (30) installed at a plurality of upper edges of the inner chamber (11) of the quasi-dry reaction tower (10) to supply slaked lime slurry;
A filter dust collector 40 disposed to be spaced apart from one side of the quasi-dry reaction tower 10 to filter contaminants of exhaust gas passing through the quasi-dry reaction tower 10;
A venturi 51 having a narrow diameter is formed therein so that the vertical connection pipe 53 is installed in the vertical direction at the outlet 18 of the semi-dry reaction tower 10 and the vertical connection pipe 53 is integrally formed. A connection pipe 50 formed of a horizontal connection pipe 55 formed to be horizontally connected to the bag filter 40;
A contaminant treatment unit (80) consisting of an activated carbon spray unit (60) for supplying activated carbon to the upper side of the venturi (51) configured in the vertical connection pipe (53), and a slaked lime spray unit (70) for supplying slaked lime;
Optimizing the reaction efficiency characterized in that consisting of; an exhaust unit 90 for exhausting the exhaust gas passing through the filter dust collector 40 to the atmosphere through the chimney 93 by using the manned blower 91 to suck the exhaust gas; An air pollution control facility.
The air pollution prevention system of claim 1, wherein the rotation direction of the upper and lower guide vanes (21, 22) is opposite to each other.
The activated carbon spraying unit 60 of the pollutant treatment unit 80 is connected to an activated carbon spraying nozzle 61 installed above the venturi 51 and to an end of the activated carbon spraying nozzle 61. It is composed of a dispersion plate 63 is activated air supply of activated carbon in the form of powder supplied from the activated carbon supply device (65) to optimize the reaction efficiency characterized in that the reaction efficiency is characterized in that the vertical connection pipe (53).

Images