KR20030013230A - Gas cleaning system equipped with reactant recycling system to reduce Dioxine - Google Patents

Abstract

PURPOSE: A reducing equipment of dioxin is provided to improve the removing efficiency by increasing the contact between the dioxin and a reactor and to prevent the generation of white lead by mixing a dust, an activated carbon, a slaked lime and water and supplying the mixed material to a reacting tub. CONSTITUTION: A reactor recirculating device transfers a reactor from a filtering and collecting portion(2) to a reacting portion(1) to be reused. A mixing conveyor contains a water injecting nozzle to inject water by automatically adjusting the amount of water according to the moisture concentration of exhaust gas. Thereby, the removing efficiency of dioxin is not reduced. Moreover, the dioxin is reduced certainly.

Description

Gas cleaning system equipped with reactant recycling system to reduce Dioxine}

The present invention relates to a dioxin abatement apparatus having a reactive agent recycling device, and more specifically, to a part of a reactive agent which is disposed of by mixing dust, activated carbon, and slaked dedusted from the dioxin abatement apparatus without being disposed of. Recover and recycle to the reactor to maintain high concentration of reactant at all times in the reaction zone and the filter baggage to drastically increase the dioxin removal efficiency, add a small amount of water to the recycled reactant and mix and recycle to the reaction zone to remove acid gas At the same time, it is composed of transfer conveyor, mixing conveyor, water supply pipe and water injection nozzle to reuse the reactants, which are industrial wastes, and thus efficiently use resources and dramatically reduce the amount of waste. Protects and removes acidic gases effectively It relates to an air pollution prevention facility that can be.

In the case of using the semi-dry method of spraying the lime slurry into the reaction tank for cooling the exhaust gas and removing the acid gas, the acid gas removal efficiency is excellent, but civil complaints are generated due to the generation of white smoke, and the size of the device is increased. In the case of using dry spraying the reactant in the state, there is no problem of generating white smoke, but there is a problem of emission of harmful gas due to a decrease in acid gas removal efficiency. It is difficult to reduce dioxins, which are currently a problem in incinerators, to less than the regulation level only by the semi-dry and dry facilities alone. It is difficult. Meanwhile, in the conventional air pollution prevention equipment, the reactive agent with activated carbon and slaked lime cannot be recycled and must be treated as waste immediately after being discharged. Therefore, excessive waste is required for the disposal of waste, and a large amount of waste is generated to treat such waste. There was a problem that becomes very difficult.

An object of the present invention is to solve this problem of the prior art described above, focusing on the fact that the reaction rate of the used reactants is less than 30%, by continuously recycling a sufficiently reusable used reactant to react the reaction section and the bag filter By maintaining the concentration of reactant about 3 ~ 4 times of newly added reactant, it can greatly increase the contact opportunity of dioxins and reactants, which can greatly improve the removal efficiency, and reuse dust according to the moisture concentration of exhaust gas. By supplying a small amount of water to the mixture of and activated charcoal and slaked lime and supplying it to the reaction tank, it is possible to solve the problem of white smoke generation caused by semi-dry use, and to reduce the problem of reducing acid gas removal efficiency by dry use. It is to provide an acid gas reduction equipment provided.

Another object of the present invention is to reuse the portion of the reactant that is discharged and disposed of, thus reducing the amount of reagent used compared to the existing equipment, thereby reducing operating costs and waste emissions, thereby preventing environmental pollution and reducing the disposal cost of waste. In addition, to provide a dioxin abatement facility equipped with a reactive material recycling device that enables efficient use of resources.

This object of the present invention is achieved by the reagent recycling apparatus according to the present invention, which further comprises a water injection device between the bottom of the filter bag and the reaction portion of the reagent recycling apparatus.

DETAILED DESCRIPTION OF THE EMBODIMENTS The features and advantages will be more clearly understood by examples described in detail below with reference to the accompanying drawings, in which a dioxin abatement apparatus having a reagent recycling apparatus according to the present invention is provided.

1 is a device configuration showing a dioxin reduction system equipped with a reactor recycling apparatus according to the present invention

2 is a detailed view of a reactor recycling apparatus according to the present invention.

Explanation of symbols on the main parts of the drawings

1. Reaction part 2. Filter dust collecting part

3. Reactor recycling device 11. Reactor

11a. Bulkhead 11d. Reactant grinder

12. Reagent Transfer Conveyor 13. Reagent Supply Device

13a. Reagent Storage Tank 13b. Reagent Discharge Conveyor

21. Bag filter 22. Cleaning gas discharge part

23. Dust Discharge Conveyor 24. Discharge Rotary Valve

25. Dust Reservoir 31. Hopper

32. Dust Transfer Conveyor 35. Mixing Conveyor

36. Moisture injection device 37. Recirculation conveyor

The dioxin abatement apparatus equipped with the reactive agent recirculation apparatus 3 according to the embodiment of the present invention, as shown in FIG. 1, communicates with the reaction part 1 and the reaction part 1 for granulating exhaust gas. And a filter recirculation unit 2 for dust removal and a reagent recycling device 3 connected to the reaction unit 1 at the lower end of the filter dust collection unit 2.

The reaction unit 1 is composed of a reaction tank 11, a reagent transport conveyor 12, and a reagent supply device 13.

The reactor 11 is hermetically sealed, and the body part is vertically connected from the upper end to the lower part and divided into two partitions 11a. An inlet port 11c through which harmful exhaust gas is introduced is provided in an upper portion of the left side 11b divided by the partition wall 11a of the reactor 11, and a reagent in a lower portion of the partition wall 11a of the reactor 11. The grinder 11d is provided.

The reactant transport conveyor 12 is installed in the horizontal direction in the lower portion of the reactor 11, the reactant transport conveyor 12 is formed with a reactant outlet (12a) in the middle portion of the reactor (11) The reactant inlet 12b is installed upward at the left end of the reactant transfer conveyor 12, and the recycle inlet 12c is installed upward at the right end.

The reactant supply device 13 is installed at a lower portion of the reactant storage tank 13a and the reactant storage tank 13a for storing a reactant such as activated carbon and slaked lime, and a predetermined amount of the reactant is stored in the reactant storage tank. It is installed in the lower portion of the reactant discharge conveyor (13b) and the discharge port (13d) of the reactant discharge conveyor (13b) discharged from the (13a) to the reactant inlet (12b) of the reactant transfer conveyor (12) It consists of the rotary valve 13c which supplies a reagent.

The filter dust collecting unit 2 is connected to the upper portion of the reaction tank 11, the bag filter 21 for collecting the harmful exhaust gas generated in the solid phase is arranged on the upper portion of the filter dust collecting unit 2, In the upper right part of the filter dust collector 2, a cleaning gas discharge part 22 provided with a damper 22a for adjusting the air flow rate of the cleaning gas is provided. A dust discharge conveyor 23 is directly below the filter dust collector 2; Is installed. A discharge port 23a is installed at a lower right portion of the dust discharge conveyor 23, and a distribution port 23b is provided at a central portion thereof. A discharge rotary valve 24 and a dust storage tank are disposed at a lower end of the distribution port 23b. (25) is provided.

Reagent recycling apparatus (3) having a water injection device for acidic gas reducing device according to the present invention installed in connection with the reaction unit (1) at the lower end of the filter dust collector (2) is the dust of the dust discharge conveyor (23) The dust conveyance conveyor 32 which the hopper 31 was provided in the upward direction in connection with the volleyball 23b is provided. A mixing conveyor 35 in which a water injection device 36 is installed is connected to an outlet of the dust conveying conveyor 32. The mixing conveyor 35 has a water supply pipe 36a, a shutoff valve 36b, and water. The water injection device 36 which consists of the injection nozzle 36c is provided. A recycling conveyor 37 is installed in connection with the mixing conveyor 35, and the recycling conveyor 37 is integrally formed on the same line of the reagent transfer conveyor 12, and the discharge port is the reactant discharge port 12c. )

The action of the present invention, the harmful exhaust gas containing the acid gas (SO _2, HCl) and dioxin (PCDD / Fs) generated by incineration is introduced into the reaction tank 11 to treat this, in order to remove the harmful exhaust gas The reactant such as slaked lime and activated carbon stored in the reactant storage tank 13a is discharged through the reactant discharge conveyor 13b, and the reactant quantitatively supplied to the rotary valve 13c according to the amount of the harmful exhaust gas reacts. When the gas is introduced into the reactor 11 through the transfer conveyor 12 and reacts with the harmful exhaust gas, the acidic gas reacts with the slaked lime and the dioxins with the activated carbon to granulate.

The slaked lime and activated carbon reacted with the harmful exhaust gas while passing through the reactor 11 are filtered together in the bag filter 21 and replaced with harmless exhaust gas and discharged into the chimney, and the dust and activated carbon exhausted from the bag filter 21. , The slaked lime powder is discharged to the dust storage tank 25 through the dust discharge conveyor 23 and the discharge rotary valve 24 to be disposed of.

In the present invention, in order to alleviate the deterioration of the harmful gas removal efficiency by adopting a dry removal method using a powdered reactant during the above-described reaction, the reactor recycling apparatus 3 is disposed at the bottom of the filter dust collector 2. It is installed in connection with the reaction section (1), and receives the dust and activated carbon, and the slaked lime powder which have been desorbed from the bag filter 21 to the hopper 31 and supplied to the mixing conveyor (35) through the dust conveying conveyor (32). When the water supply pipe 36a is installed, the shutoff valve 36b automatically adjusts the amount of water according to the moisture concentration of the exhaust gas and supplies it to the mixing conveyor 35 through the water injection nozzle 36c. It is continuously mixed with activated carbon and hydrated lime powder to be re-supplied to the reactor 11 through the recycle conveyor (37). The effect is that if the reactor (1) and the filter bag (2) are assumed to be a bin, if the amount of reactant of 1 is continuously supplied and discharged from the bin, the amount of reactant 2 is always 3 in this bin. There will be a reactant in the amount of (1 + 2). It uses a reagent of 1, but actually has a reagent of 3, which greatly increases the frequency of contact between various pollutants and the reactants, allowing dioxin to adsorb on activated lime to hydrated lime with acidic gas. The removal efficiency of acid gas can be improved significantly compared to the existing technology. In addition, by installing an inverter or a timer in the recirculation conveyor 37, the planned amount can be recycled relatively accurately and can be adjusted as needed.

In the case of the existing semi-dry or dry treatment alone, dust is dedusted from the bag filter in order to prevent the dioxin treatment from being unstable, the white smoke problem in the case of semi-dry, and the removal efficiency of the acid gas due to the lack of moisture in the exhaust gas. By adding a small amount of water to the mixture and mixing, and recirculating and supplying to the reaction tank, the dioxins can be surely removed by this facility alone, and the acid gas removal efficiency is not lower than that of the semi-dry type, and the reaction efficiency of the reactant is only 30%. Reuse has the effect of reducing waste throughput and reducing the amount of reagent used.

Claims (1)

In the dioxin abatement system consisting of the reaction section (1) and the filter bag (2), the reactant recirculation apparatus (3) for transferring the reactant dedusted from the filter bag (2) to reuse, and the water concentration of the exhaust gas According to the mixing conveyor 35 including a water injection nozzle (36c) for automatically adjusting the amount of water to be sprayed and the reactant discharged from the filter dust collection unit 2 is characterized in that it is conveyed back to the reaction unit (1) A dioxin abatement system having a reactive agent recycling device.