KR100252809B1 - Filtering device for gas and particle-type pollutants - Google Patents

Abstract

PURPOSE: Disclosed is a filtering dust collector for simultaneous removal of gas-phase and particular pollutants. CONSTITUTION: The filtering dust collector system(10) is composed of a gas feed tube(12), an adsorbent feed system(14), and an additive feed system(20), and a dry purification reactor(26). The acidic gases such as SOx, HCl, and HF are reacted to change into various calcium salts like CaSO3, CaCl2, and CaF2 in the reactor(26). The catalytic filtering system(30) is installed at the inner part of the cylindrical baffle(28) of the reactor(26) to react dust, dry purifying reactants, NOx, VOC, or CO. The adsorbent feed system(14) and the additive feed system(20) have a jet nozzle(18,22) to well disperse adsorbent. The dust storage(36) is installed at the bottom part of the system(10) and has a hopper(34) and a reverse-direction sloped ring sill(38).

Description

Filter dust collector for gaseous and particulate contaminants

The present invention is a heavy metal, a large amount of smoke and other dust generated in the production process, incineration, power generation facilities of each industry, carbon monoxide (CO), nitrogen oxides (NOx), sulfur oxides (SOx), hydrogen chloride (HCl), and various volatile organic The present invention relates to a bag filter for collecting gaseous and particulate contaminants to collectively process compounds (VOCs).

Exhaust gases emitted to the atmosphere from various industrial facilities and power generation facilities using energy sources include nitrogen oxides, dust, sulfur dioxide, carbon monoxide and organic substances including polychlorobiphenyl (PCB), polycyclic aromatic carbon (PAC), and polychlorodibenzodioxine (PCDD). Contains various harmful gases.

Conventional exhaust gas purification equipment absorbs sulfur oxides (SOx) and hydrogen chloride (HCl) depending on the object to be treated. Selective Catalytic Reduction treatment of wet, semi-dry, dry cleaning equipment, and nitrogen oxides (NOx). Equipment, selective non-catalytic reduction, catalytic oxidation treatment for organic compounds, activated carbon adsorption, and dust removal facilities (cyclones, electrostatic precipitators, bag filters, etc.) Purification facility is used.

Accordingly, in order to treat all the various pollutants contained in the exhaust gas, the installation burden of the air pollution prevention facility was very large, and the burden of personnel and technical management required for operation and maintenance was great.

In addition, since most of the conventional cleaning methods for treating nitrogen oxides (NOx) and hydrogen chloride (HCl) are treated in a wet manner, many wastewaters are generated and contaminate soil and the environment, and conventional nitrogen oxides (NOx) treatment methods By injecting ammonia (NH ₃ ), unreacted ammonia is contained in the exhaust gas and is discharged together to cause secondary environmental pollution. Also, vanadium (NOx) or vanadium used to treat organic compounds ( Vanadium) Palladium (Palladium), Platinum (Platinum), Titanium (Titanium), such as the catalyst is very expensive because the catalyst life is a big problem that the replacement cost is high when the replacement.

In addition, the conventional filtration equipment is used only to remove the dust, the filter medium is also limited to the use of the filtration equipment according to the temperature of the exhaust gas can not be used at a high temperature of about 200 ℃.

The present invention was devised to solve the above problems of the prior art, and provides a catalyst which is much cheaper than conventional catalysts and has a heat resistance even at high temperature exhaust gas and purifies the exhaust gas, and is equipped with dry cleaning equipment to waste gas. Of gaseous and particulate contaminants that enable the economical batch processing of sulfur oxides (SOx), nitrogen oxides (NOx), hydrogen chloride (HCl), hydrogen fluoride (HF), carbon monoxide (CO), organic compounds, and dust. The purpose is to provide a bag filter.

In order to achieve the above object, the present invention, the gas inlet pipe is connected to one side of the main body to introduce the waste gas containing the gaseous and particulate contaminants into the main body of the filter dust collector, and the absorbent and the absorbent to the gas inlet pipe as necessary An absorbent injector for supplying an additive and an additive injector are installed in the filter dust collector to perform a dry cleaning reaction on the waste gas flowing into the gas inlet pipe, wherein the filter dust collecting body includes SOx, HCl, HF, etc. of the waste gas. Dry gas containing the gas inlet pipe, which is connected to the gas inlet pipe and partitioned through a cylindrical baffle installed in the filter dust collecting body to generate acidic gas as a chemical reaction to produce CaSO ₃ , CaSO ₄ , CaCl ₂ , and CaF ₂ . Dust and dry cleaning reactants, nitrogen, which are disposed inside the cylindrical baffle and passed through the dry cleaning reactor. That a catalytic filtration member for storage, volatile organic compounds, carbon monoxide, etc. The waste gas containing the absorbed reaction, the catalyst was filtered reaction process composed characterized.

1 is an overall configuration diagram of the bag filter of the present invention.

2 is a cross-sectional view inside the filtration device of the present invention.

3 is a main configuration diagram of the compressed air supply system of the present invention.

4 is a main configuration diagram of the absorbent injection equipment of the present invention.

5 is a perspective view of a catalytic filtration member having heat resistance of the present invention.

<Explanation of symbols for main parts of drawing>

10: main body 12: gas inlet pipe

14: absorbent injection device 20: additive injection device

26: dry cleaning reactor 28: cylindrical baffle

30: catalytic filtering member 32: compressed air supply device

33: Venturi Socket 34: Hopper

36: dust storage unit 38: reverse slope round

40, 46: valve 48: pressure sensor

50: pressure gauge 52: controller

56 heat exchanger 58 suction fan

100: bag filter

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is an overall configuration diagram of the bag filter of the present invention, Figure 2 is a cross-sectional view of the interior of the filter device of the present invention, Figure 3 is a main configuration diagram of the compressed air supply equipment of the present invention, Figure 4 is Fig. 5 shows a perspective view of a main portion of an absorbent injection device, and FIG. 5 shows a catalytic filter member having heat resistance according to the present invention.

As shown in FIG. 1, in the present invention, a gas inflow pipe 12 for introducing waste gas containing gaseous and particulate contaminants into the filter dust collecting facility 100 is installed at an upper side of the main body 10.

The gas inlet pipe 12 is provided with an absorbent injector 14 for supplying lime as shown in FIGS. 1 and 4. The absorbent injector 14 is provided with a screw feeder 16 that can adjust the supply amount of the absorbent of lime powder, and provides good contact with the waste gas when the absorbent of the lime powder is supplied to the gas inlet pipe 12. In order to disperse by air injection, a jet nozzle 18 is preferably installed.

In addition, an additive injector 20 is installed at one side of the absorbent injector 14 to increase the chemical reaction activity of the lime powder absorbent, and the additive (for example, sodium chloride, sodium bicarbonate, etc.) is provided in the gas inlet tube 12. The jet nozzle 22 is installed so as to be dispersed by the air spray when supplied to the.

The gas inlet pipe 12 is connected to a dry cleaning reactor 26 formed in the main body 10 of the bag filter 100. This dry cleaning reactor 26 comprises a space inside the body 10, including the gas inlet pipe 12 connected thereto as shown in FIGS. 1 and 2, which is perpendicular to the top of the inside of the body 10. The gas inlet pipe 12 is tangentially connected to the dry cleaning reactor 26, and is partitioned by a cylindrical baffle 28 having an opening thereunder. Accordingly, when the waste gas introduced into the gas inlet pipe 12 flows into the dry cleaning reactor 26, the waste gas flows while rotating in the circular dry cleaning reactor 26, so that the absorbent (lime powder) stays in the dispersed phase. This lengthens the reaction to increase the reaction with the waste gas, and by the dispersion of the lime powder particles, it has the effect of being evenly dispersed together with the waste gas in the catalytic filtration member 30 described later.

Inside the cylindrical baffle 28 is provided with a plurality of catalytic filtration member 30 made of a pipe shape to filter the waste gas passing through the dry cleaning reactor 26 and the waste gas containing the dry cleaning reactant.

The catalytic filtration member 30 has a hollow pipe shape as shown in FIG. 5 and is blocked at the bottom, open at the top, and covered with a grid 30a on the outside and the inside. The catalyst filter medium 30b having a thickness of about 3 cm is filled between the gaps 30a, and a tapered thread part 30c is installed at the upper outlet of the catalytic filter member 30 so that the catalytic filter member 30 is formed. It is configured to be screwed to the venturi socket 33 installed in the main body 10 so that the catalyst can be easily replaced when the life of the catalyst is completed.

The catalytic filter medium 30b is a fiber catalyst described in Korean Patent Application No. 97-9564 (name: fiber catalyst for purifying waste gas of industrial facilities and internal combustion engines and a method of manufacturing the same), which is filed by the applicant. It has high heat resistance, so it is stable to local heating and instantaneous heating, so there is no catalyst damage caused by heat, no water film phenomenon caused by agglomeration of water vapor, and a fiber structure that can easily contact the reaction gases. The exhaust gas of the gas can be purified.

The lower part of the filter dust collector main body 10 is connected to the dry cleaning reactor 26 through the hopper 34 for inducing dust, the dust storage unit 36 for receiving the dust is installed. The upper part of the dust storage part 36 is formed such that the hopper 34 and the reverse inclined round projection 38 are formed so that the dust collected in the dust storage part 36 is not scattered again, and the dust storage part 36 The lower part of the) is provided with a dust outlet 42 having a valve 40 is configured to discharge the dust in the dust storage unit 36 to the outside.

When the pressure of the catalytic filtration member 30 is increased by a cake attached to the upper surface of the catalytic filtration member 30 and attached to the outer surface of the catalytic filtration member 30, the catalyst is operated as an electrical signal. A compressed air supply device 32 for backwashing the catalytic filtration member 30 for supplying compressed air to the sex filtration member 30 is provided.

The compressed air supply device 32 is a compressed air storage tank 44 is connected to the compressed air supply 47 as shown in Figures 1 and 3, the compressed air storage tank 44, the catalytic filtration A plurality of valves 46 equal to the number of members 30 are provided, respectively.

In addition, a plurality of pressure sensors 48 for checking pressure loss inside and outside the catalytic filtration member 30 and a pressure gauge 50 for displaying the measured pressure are installed, which is connected to the controller 52. The controller 52 is electrically connected to the valves 46 to generate the cake of the catalytic filtration member 30, and according to the pressure difference between the internal and external pressures of the catalytic filtration member 30. By opening the valve 46 by the electrical signal of 52) is supplied to the inside of the compressed air catalytic filtering member 30 in the compressed air storage tank 44 is configured to backwash the cake.

The exhaust gas discharge pipe 54 disposed on one side of the filter dust collector main body 10 lowers the temperature of the purified exhaust gas through the catalytic filter member 30 (the exhaust gas temperature of about 300 ° C. is about 150 ° C.). Heat exchanger (56), and a suction fan (58) for sucking exhaust gas and discharging it to the atmosphere.

Referring to the effects of the present invention configured as described above are as follows.

In accordance with the operation of the filter dust collecting equipment 100, the suction fan 58 is driven together, and gas is introduced into the waste gas containing SOx, NOx, HCl, CO, volatile organic compounds, dust, etc. by the suction force of the suction fan 58. The inflow is made into the bag body 12 through the pipe (12). At this time, the lime powder is supplied from the absorbent injector 14 installed in the gas inlet pipe 12 to the gas inlet pipe 12 in a dispersed form through the screw feeder 16 and the jet nozzle 18, and an additive injector as necessary. The additive is also supplied together to the gas inlet pipe 12 in a dispersed form through the jet nozzle 22 of 20.

Accordingly, the waste gas is introduced into the dry cleaning reactor 26 through the gas inlet pipe 12 in the state where the lime powder and the additive are distributed together. From the gas inlet pipe 12 to the dry cleaning reactor 26, During the passage, acid gases such as SOx, HCl, HF, etc. are chemically reacted with lime to produce CaSO ₃ , CaSO ₄ , CaCl ₂ , and CaF ₂ , which are removed from the catalytic filtration member 30.

As the above chemical reaction proceeds with the reaction of the waste gas and the solid phase absorbent, the treatment efficiency may be somewhat lowered, but the additive supplied through the additive injector 20 is simultaneously supplied with the lime powder and the chemical is reacted by the additive. The reaction is activated to increase the dry cleaning efficiency in the dry cleaning reactor (26). In addition, since the gas inlet pipe 12 is connected in a tangential direction with the dry cleaning reactor 26 through the upper side of the main body 10, the flow of the waste gas is rotated, so that the lime powder stays in the dispersed phase for a long time. The reaction with the waste gas is increased and at the same time it is possible to obtain a dispersion effect in the catalytic filtration member 30.

As described above, the waste gas from which acidic gases such as SOx, HCl, and HF are removed while passing through the dry cleaning reactor 26 passes through the catalytic filter medium 30b of the catalytic filtering member 30 to remove dust and dry cleaning reactants. Nitrogen oxides, volatile organic compounds, etc. are collected and catalytically treated. Most of the dust is removed from the outer layer of the catalytic filter medium 30b of about 1 cm, and waste gas containing a large amount of CO, volatile organic compounds, and NOx by-products of incomplete combustion is the inner layer of the catalytic filter medium 30b. The catalyst is reduced / oxidized while passing through the inner layer (about 2 cm thick) to change to N ₂ , N ₂ O, and CO ₂ . In this case, when a denitrification (DeNOx), conventional catalysts, while for the reaction reduced to NO by injecting NH _3, the present invention is not injected into the NH _3, the NO by the CO in the exhaust gas to N _2, Since CO is reacted with CO ₂ , the ammonia gas, which is a toxic substance, is not used, and the emission of CO can be reduced simultaneously.

The exhaust gas purified through the catalytic filtration member 30 as described above passes through the heat exchanger 56 while being exhausted through the exhaust gas discharge pipe 54 installed at one side of the filter dust collecting body 10. The temperature of is lowered from about 300 ℃ to 150 ℃ led to the suction fan 58 is finally released to the atmosphere.

During the filtration process of the waste gas containing a large amount of dust as described above in the catalytic filtering member 30, the dust forms a cake on the surface of the catalytic filter medium 30b, so that the inside of the catalytic filtering member 30, The external pressure loss continues to increase. Accordingly, when the pressure loss is continuously detected by the plurality of pressure sensors 48 and the pressure loss reaches the limit value, the signals of the pressure sensor 48 and the pressure gauge 50 are transmitted to the controller 52 and electrically connected thereto. The connected valve 46 is opened.

Therefore, the compressed air in the compressed air storage tank 44 connected to the compressed air supply 47 is supplied into the catalytic filtration member 30 connected thereto through the venturi socket 33 installed in the main body 10. To give a strong shock to the inside, the cakes attached to the outer surface of the catalytic filtering member 30 is dropped and the backwashing of the catalytic filtering member 30 is made.

As described above, the dust collected by the catalytic filtration member 30 is separated from the catalytic filtration member 30 by backwashing and descends into the main body 10 due to the gravity, and the dust through the hopper 34. Dust is collected into the storage unit 36. The collected dust then opens the valve 40 and is discharged out through the dust outlet 42.

On the other hand, the dust collected by the dust storage unit 36 has a reverse slope round projection 38 is formed on the upper portion of the dust is not scattered again.

As described above, by the bag filter 100, sulfur oxides (SOx) in the exhaust gas can be removed by 80%, hydrogen chloride (HCl) and hydrogen fluoride (HF) by 95-99%, and nitrogen oxides (NOx). ) And more than 95% of organic compounds and 99% of dust can be removed at the same time. In addition, since the catalytic filtration member 30 has heat resistance, the exhaust gas having a high temperature of 300 ° C or higher can be filtered and collected.

In the case where the amount of acid gas discharged such as SOx, HCl, HF, etc. is small, the NOx, the volatile organic compound, and the dust can be filtered and collected in a lump without installing the absorbent injection device 14 and the additive injector 20. .

On the other hand, the catalytic filtration member 30 is screwed with the venturi socket 33 installed in the main body 10 through a tapered threaded portion 30c formed on the upper portion thereof, and when the life of the catalyst is completed, the catalytic filtration member ( 30) can be easily replaced.

On the other hand, the size of the dry cleaning reactor 26 is determined according to the size and number of the catalytic filtration member 30 installed in the main body 10.

As described above, the present invention is connected to the gas inlet pipe to produce CaSO ₃ , CaSO ₄ , CaCl ₂ , and CaF ₂ by chemical reaction of acid gases such as SOx, HCl, HF, and the like in the waste gas collection cylinder. It is partitioned through a baffle, and the dry cleaning reactor including the gas inlet pipe, the dust and dry cleaning reactants, nitrogen oxides, volatile organic compounds, carbon monoxide, etc. which are disposed inside the cylindrical baffle of the main body and passed through the dry cleaning reactor Exhaust gas is filtered and collected through a catalytic filter member having heat resistance to filter the waste gas contained therein, so that various types of air pollutants (SOx, NOx, HCl, HF, CO) are discharged in large quantities from industrial and incineration / power generation facilities. , Volatile organic compounds, dust, etc.) to effectively clean up and contribute to environmental preservation, and to significantly reduce the cost of equipment An effect that will be obtained.

Claims (7)

A gas inlet pipe 12 is connected to one side of the main body 10 to introduce a waste gas containing gaseous and particulate contaminants into the main body 10 of the filter dust collector, and the gas inlet pipe 12 as necessary. In the filter dust collector which is provided with an absorbent injector 14 and an additive injector 20 for supplying an absorbent and an additive so that the dry cleaning reaction proceeds to the waste gas flowing into the gas inlet pipe 12, the filter dust collector The main body 10 is connected to the gas inlet pipe 12 to generate CaSO ₃ , CaSO ₄ , CaCl ₂ , CaF ₂ by chemical reaction of acidic gases such as SOx, HCl, HF, and the like of the waste gas, The dry cleaning reactor 26 is partitioned through the cylindrical baffle 28 installed in the inside and includes the gas inlet pipe 12, and the dry cleaning reactor 26 is disposed inside the cylindrical baffle 28. Dust and dry cleaning reactants, Filtering dust collector of nitrogen oxides, volatile organic compounds, gaseous and particulate pollutants, characterized in that the catalytic filter material 30 to the carbon monoxide contained in waste gas filtration absorption reaction, a catalytic reaction process composed. The gas absorber of claim 1, wherein the absorbent injector 14 is provided with a jet nozzle 18 so that the absorbent is dispersed by air injection when the absorbent is supplied to the gas inlet pipe 12. Bag filter. The gas injector of claim 1, wherein the additive injector (20) is provided with a jet nozzle (22) so that the additive is dispersed by air injection when the additive is supplied to the gas inlet pipe (12). Bag filter. The apparatus of claim 1, wherein the gas inlet pipe (12) is connected in a tangential direction to the dry cleaning reactor (26). The method of claim 1, wherein the catalytic filtration member 30 is in the form of a hollow pipe, the bottom is blocked, the top is open, the outside and inside is covered with a grid (30a), between the grid (30a) Filtration device for gaseous and particulate contaminants, characterized in that the heat-resistant catalytic filter medium (30b) is filled in. The method of claim 5, wherein the upper outlet of the catalytic filtration member 30 is provided with a tapered screw portion (30c) screw coupling to the venturi socket 33, the catalytic filtration member 30 is installed in the main body 10 Filter dust collecting device for gas and particulate contaminants, characterized in that. The upper portion of the dust storage unit 36 formed at the lower part of the filter dust collector main body 10 has a hopper 34 and a reverse inclined round projection 38 to prevent the scattering of collected dust. Filter collecting device for gaseous and particulate contaminants, characterized in that formed.

Images