JPH11211064A - Chimney improvement structure capable of capturing harmful substances from combustion waste gas - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a chimney improvement structure capable of capturing harmful substances of combustion waste gas, which has functions of dust removal, desulfurization, and denitration. A reaction tower (20) is provided at a lower end of a chimney main body (10), and the inside of the reaction tower is partitioned into a plurality of compartments (24, 25) by a partition plate (30), and each compartment interior corresponds to each compartment. A plurality of spray sets (22) communicating with the dilution ponds (40, 60) are provided in a single-stage or multi-stage arrangement.
The dilution liquid whose value is automatically controlled is ejected by the corresponding spray set via the pumps (e, f), and the fine dust in the waste gas introduced from the combustion mechanism is attached and captured, thereby causing a chemical reaction with the harmful gas. At the same time, a drain port (241, 251) is provided at the lowermost end of each compartment to discharge the waste liquid condensed and settled including the fine dust and the chemical reactant that have been attached and captured, and to cool and filter the discharged waste liquid, respectively. After treatment, it flows into the dilution pond, is collected and reused.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chimney improvement structure, and more particularly, to a chimney improvement structure having a function of removing dust, desulfurization and denitration and capable of capturing harmful substances of combustion waste gas.

[0002]

2. Description of the Related Art With the mass production system brought about by the development of production technology, many industries produce a large amount of various pollutions in the production process, and both air and water are inevitable. Therefore, many people became interested in the problem of environmental pollution, and several years ago, the present inventor also proposed a “method and apparatus for removing chimney waste gas” aimed at reducing the pollution of waste gas discharged from a chimney. Technology No. 14242 in Taiwan
The patent right was obtained. As shown in FIG. 3, this device mainly introduces waste gas into a filtration device 30a mounted between the boiler 10a and the chimney 20a between the boiler 10a and a chimney 20a provided perpendicular to the boiler 10a. And at least one spray set 60a, 70a and a flue 35 communicating with the chimney 20a in the filtering device 30a.
a, and by connecting the spray sets 60a, 70a with the mixer 40a, the N
A fine alkaline mist of aOH is ejected to adhere and capture fine dust particles contained in waste gas flowing through the filtration device 30a, and NaOH and harmful gas such as SO
₂ or SO ₃ or the like to form a precipitate compound by a chemical reaction, and the precipitation tank 5 is passed through the filtration device 30a and the outlets 34a and 22a provided at the bottom of the chimney 20a.
It condenses and settles in the space 0a, thereby achieving the purpose of dust removal and desulfurization. However, the NaOH diluent contained in the mixer 40a is not enough to completely fulfill the purpose of denitration, and the waste liquid flowing into the settling tank 50a cannot be effectively treated.

[0003]

SUMMARY OF THE INVENTION In view of the above problems in the conventional treatment of stack exhaust gas, the present invention relates to an improved stack having a function of dust removal, desulfurization and denitration and capable of capturing harmful substances of combustion waste gas. The purpose is to provide.

[0004]

In order to achieve the above object, according to the present invention, a reaction tower is provided at the lower end of a chimney main body, and the inside of the reaction tower is partitioned into a plurality of compartments by a partition plate. A plurality of spray sets communicating with the corresponding dilution ponds are provided in one or more stages, and a strong oxidizing agent (eg, NaClO ₂ ) diluting solution and a weak alkali (eg, NaOH) diluting solution supplied from each diluting pond are provided. To the corresponding spray set by the pump and eject it,
The fine dust in the waste air introduced from the combustion mechanism is adsorbed and trapped, causing a chemical reaction with harmful gases (eg, sulfur oxides SO _x , nitrogen oxides NO _x, etc.) and draining to the lowermost end of each compartment. An opening is provided to discharge condensed and settled waste liquid containing fine dust and chemical reactants trapped and adhered, and if the discharged waste liquid is high in temperature, it is subjected to a cooling process and then cooled to a storage tank in order. After being subjected to a filtration treatment, it is configured to flow into the diluting pond to be collected and reused.

[0005] Alternatively, an inlet for introducing waste gas generated by a combustion mechanism is formed at the lower end of the reaction tower connected to the lower end of the chimney main body, and demisting is performed on the uppermost part of a plurality of spray sets provided inside the reaction tower. In a chimney structure to which a vessel is attached, an oblique horizontal partition plate is provided at an appropriate height in the reaction tower, for example, when the inside of the reaction tower is divided into two compartments, the inside of the reaction tower is in the lower half. The first and second compartments are divided into a first compartment and a second compartment, and a plurality of spray sets are disposed in the first compartment and the second compartment, respectively, in one or more stages. And a spray set in the first compartment is supplied with a strong oxidizing agent diluent from a first diluting pond connected thereto through a pump, and squirts into a mist-like radiation distribution. Adsorbs and captures fine dust in the waste air flowing through the At the same time as oxidizing the harmful gas containing NO, a first drain port is provided at the lowermost end of the first compartment to allow the condensed and settled waste liquid to flow into the first reservoir, and A spray remover is formed on the uppermost part of the spray set in the second compartment, and each spray set is supplied with a weak alkaline diluent through a pump from a second dilution pond connected to each spray set, and sprayed in the form of a mist. erupted distribution, and the fine dust in the waste gas which has flowed into the compartment of the second adhering capture, produce harmful gases and chemical reactions, such as sulfur oxides SO _x, nitrogen oxide NO _x, further said A second drain port is provided at the lower end of the second compartment to allow the condensed and settled waste liquid to flow into the second reservoir to perform the functions of desulfurization and denitrification, and to open a through hole in the center of each partition plate. Then, a hollow ventilation cylinder is extended upward along the periphery thereof, and gas flows to the upper end of the ventilation cylinder. A conical protective roof capable of preventing the waste liquid condensed and settled in the second compartment is prevented from flowing to the first compartment.

[0006] Each waste liquid condensed and settled in the reaction tower flows through the first drain port and the second drain port to the first drain port, respectively.
After flowing into the reservoir and the second reservoir, and in the case of high temperature, it is sent to the cooling tower for the time being to be cooled, then returned to each reservoir, and then sent to the respective filtration facilities and filtered. For further recovery and reuse, each of them is guided into the first dilution pond and the second dilution pond, and mixed with the solvent provided by the strong oxidizer stock solution storage tank and the weak alkali stock solution storage tank and the supplementary soft water. The required dilution liquid is formed, and finally, the dilution liquid is ejected by the spray set in each of the first and second compartments to oxidize and neutralize harmful substances flowing into each compartment to reduce pollution. And resource saving from filtration and recovery of waste liquid,
The strong oxidizer contained in the dilution liquid of the dilution pond is NaClO ₂ ,
Weak alkali liquids such as KMnO ₄ or H ₂ O ₂ contained in the diluent of the second dilution pond are NaOH, Ca (OH)
₂ or Mg (OH) ₂ or the like, or a soft water spray is provided above the demister in the second compartment so as to enhance the dust filtering effect. Or the diluents of the first and second dilution ponds are mixed with the required solvent, the waste liquid after filtration and recovery, and the replenished soft water, and the required pH value is measured by a pH value sensor. It is more preferable to automatically adjust to (pharmaceutical amount) and to stir and mix with the compressed air generated by the compressed air pipe, or to form the filtering equipment by a plate frame type pressure filter.

According to the present invention having the above-described structure, when waste gas containing fine dust particles and harmful gas generated by the combustion mechanism flows into the reaction tower, the reaction tower is partitioned into two compartments. If so, first, the stock solution in both stock solution storage tanks flows into the corresponding dilution ponds, and the strong oxidizer and weak alkali solution produced by mixing with the supplemented soft water and stirring and diluting are respectively pumped into the first and second compartments. The air is sent to the chambers and is ejected from the spray sets arranged in one or more stages in each of the compartments via compressed air. In the first compartment, the waste air containing the fine dust particles and harmful gas is sprayed. A chemical oxidation reaction occurs by contact with a dilute solution containing a strong oxidizing agent that emits a mist and emits a mist, and the harmful gas containing NO is oxidized first to NO _2, and after that oxidation comprise of NO ₂ gas and sulfur oxides SO _x Waste gas is flowing into the upper Furthermore, partial N
The aClO ₂ also rises and flows under the conical protective roof and enters the second compartment, where the mist containing the weak alkaline liquid ejected from the spray set is turned. A chemical reaction occurs upon contact with the diluent having a linear radiation distribution, while at the same time achieving the purpose of desulfurization and denitration. In other words, the fine dust and harmful gas in the waste gas are remarkably reduced through the adhesion and capture and the double or multiple condensation and sedimentation of the spray set and the demister in the two-stage or multi-stage arrangement as described above. The effects of dust removal, desulfurization and denitration can be achieved.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be specifically described based on embodiments, but the present invention is not limited to these embodiments.

A relatively preferred embodiment of the chimney improving structure for capturing harmful substances of combustion waste gas according to the present invention is as follows. First, make-up soft water g is passed to each dilution pond 40, 60, and at the same time, a stock solution of strong oxidizer and weak alkali The stock solutions are allowed to flow from the storage tanks 80 and 90, and then compressed air is sent from the compressed air pipe 300 to mix and mix the replenished soft water g in the dilution ponds 40 and 60 with the stock solution. It is diluted to the set concentration by the action of 41,61. As shown in FIGS. 1 and 2, a reaction tower 20 is mainly provided in connection with the lower end of the chimney main body 10, and an inlet 21 is opened at an appropriate position on a lower peripheral portion of the reaction tower 20, and combustion is performed. A mechanism (not shown) introduces the generated waste air. Among them, the combustion mechanism may be any of a generator, a boiler, an incinerator, a coal furnace, a metal furnace, and the like, and a plurality of spray sets 22 are provided in the reaction tower 20 in a single-stage or multi-stage arrangement. Spray set 2
Due to the fog and haze radiation distribution of the diluting liquid that continually squirts in 2,
The fine dust in the waste air is attached and captured, and a chemical reaction occurs with the harmful gas. The spray set 22 is further provided with at least one set of a demister 23 at the uppermost part thereof. The demister 23 is resistant to high temperatures and has an excellent condensation and sedimentation action. , To skip any further rants,
The main points of improvement of the present invention are described below.

The present embodiment will be described with reference to an example in which two compartments are installed in the reaction tower 20. A partition 30 is provided at an appropriate height in the reaction tower 20 in an oblique direction. The reaction tower 20 is just divided into upper and lower halves, the lower half being a first compartment 24 and the upper half being a second compartment 25. Then, the first compartment 24 and the second compartment 2
5, a plurality of spray sets 22 are mounted in a single-stage or multi-stage arrangement, and the bottom of the reaction tower 20 is inclined to the bottom 2
6, wherein the spray set 22 of the first compartment 24 is in communication with the first dilution pond 40 to pump the diluent of the strong oxidant provided by the first dilution pond 40. f, spraying out to a mist-like radiation distribution by the spray set 22 to adhere to and capture the fine dust, generate a chemical reaction and oxidize the harmful gas containing NO, and A first drain port 241 is provided at the lowermost end of 24, and the condensed and settled waste liquid flows into the first storage tank 50. At this time, if the waste liquid flowing into the first storage tank 50 is still detected as having a high temperature by the first temperature sensing controller d, the cooling device (the cooling tower 200 in this embodiment) is pumped by the pump 400. After being cooled to the storage tank 50, and then sent to the filtration equipment 100 by the filtration pump b to remove the dirt by the filtration treatment. Then, the first dilution pond is supplied together with the replenished soft water g as clean recovered water. It is sent to 40 and blended to an appropriate concentration. On the other hand, all of the spray sets 22 in the second compartment 25 communicate with the second dilution pond 60 to form a demister 23 at the uppermost part of the spray set 22 and above the demister 23. The soft water spray 27 is provided to enhance the dust filtering effect, and the weak alkali diluent provided from the second dilution pond 60 is jetted by the spray set 22 to the atomized radiation distribution via the pump e. Then, the fine dust particles flowing into the second compartment 25 are adhered and captured, and at the same time, a harmful gas such as sulfur oxide SO by a chemical reaction method.
x, nitrogen oxides NOx, etc. and a weak alkaline diluent are chemically reacted to achieve the purpose of desulfurization and denitrification.
A second drain port 251 is provided at the lowermost end of the compartment 25 to introduce the condensed and settled waste liquid into the second storage tank 70. In this case, if the waste liquid to be introduced into the second reservoir 70 is still detected as having a high temperature by the second temperature sensing controller c, the cooling device (in this embodiment, the cooling tower 20 in this embodiment) is detected by the pump 400.
0), cool it for a while, return it to the reservoir 70, and further send it to the filtration equipment 100 by the filtration filter a to remove the dirt by the filtration treatment. Is sent to the dilution pond 60 and is mixed at an appropriate concentration. In addition, a through hole 31 is opened in the center of the partition plate 30, and the hollow ventilation tube 32 extends upward along the periphery of the through hole 31.
And a conical protection roof 33 is attached to the upper end of the ventilation tube 32 so that gas can flow therethrough to prevent the waste liquid condensed and settled in the second compartment 25 from flowing to the first compartment 24. I do. The two temperature sensing controllers d and c activate the cooling tower 200 and the pump 400 when the waste liquid introduced into the reservoirs 50 and 70 is higher than the set temperature, respectively. The function of stopping the operation of the pump 400 is provided.

The above has described the structure of each member and the related installation position in the chimney structure of the present invention. Next, the principle of recovery and utilization of the partition plate and waste liquid and its advantages will be described.

[0012] Of the diluent containing a strong oxidizing agent ejected in the first compartment 24, the strong oxidizing agent is NaClO ₂ , KMn
O ₄ or H ₂ O ₂ or the like may be used. The diluent is a solvent in the strong oxidizing agent stock solution storage tank 80, a waste liquid for filtration and recovery, and replenished soft water. Then, it is accelerated and melted by the compressed air which is blown out of the compressed air pipe 300 provided at the bottom of the pond, so that uniform quality is formed. On the other hand, the weak alkaline solution diluted in the second compartment 25 is NaOH, Ca (O
H) ₂ or Mg (OH) ₂ or the like. The solvent in the weak alkaline stock solution storage tank 90, the waste liquid for filtration and recovery, and the replenished soft water g are automatically adjusted in the second dilution pond 60 by the pH sensor 61. The compressed air blown out from the compressed air pipe 300 provided at the bottom of the pond accelerates and dissolves to form uniform quality.

Therefore, when waste gas such as fine dust particles and harmful gases such as sulfur oxides SO _x and nitrogen oxides NO _x generated in the combustion mechanism flows into the reaction tower 20 through the inlet 21, first, In contact with the dilute solution containing a strong oxidizing agent in the mist radiation distribution in the first compartment 24, a chemical oxidation reaction occurs, and the harmful gas containing NO is oxidized first to NO ₂ , The second compartment 25 can further react with the weak alkaline solution. Taking NaClO ₂ as an example of the strong oxidizing agent in this embodiment, the simplified chemical equation can be expressed as 2NO + NaClO ₂ → 2NO ₂ + NaCl.

The oxidized gas (NO ₂ ) and the sulfur oxide SOx waste gas flow further upward, and the partial NaCO _{2 2}
Also rises with the gas and the second compartment 25
In contact with the dilute solution having a mist emission distribution containing a weak alkaline solution, a chemical reaction occurs, and at the same time, the purpose of desulfurization and denitration can be achieved. Na as a weak alkaline solution in this embodiment
Taking OH as an example, the simplified chemical equation can be shown as follows. 2NaOH + SO ₂ → Na ₂ SO ₃ + H ₂ O Na ₂ SO ₃ + H ₂ O + SO ₂ → 2NaHSO ₃ 4NO ₂ + NaClO ₂ + 4NaOH → 4NaNO ₃ + NaCl + 2H ₂ O

In this way, the fine dust and harmful gas in the waste air are remarkably reduced through the adhesion and capture and the double condensation and sedimentation of the multiple spray sets 22 and the demisters 23 arranged in two stages. The effects of dust removal, desulfurization and denitration can be achieved. According to reliable experimental data, the dust removal efficiency of the present invention is 8
Desulfurization efficiency reaches more than 95% and denitrification efficiency reaches more than 74%, reaching 5% or more. Table 1 is a comparison table before and after the air pollution treatment of the Penghu Power Plant of Taiwan Electric Power Company, which operated the present invention.

[0016]

[Table 1]

That is, the partition plate 30 is positioned above the inside of the reaction tower 20.
The spray set 22 is divided into lower halves and arranged in one or more stages of the first compartment 24 and the second compartment 25.
From the diluting liquid containing the necessary strong oxidizing agent and the diluting liquid containing the weak alkaline liquid, respectively, are sprayed into a mist-like radiation distribution, and the fine dust in the waste air is condensed and sedimented to generate a chemical reaction with the harmful gas. Since the strong oxidizing agent and the weak alkaline liquid are not mixed, the efficiency of dust removal, desulfurization and denitration can be further improved. The waste liquid condensed and settled is discharged to the first drain 241.
And the first drain 5 through the second drain 251 respectively.
When the waste liquid flows into the zero and second reservoirs 70 and the waste liquid is higher than the set temperature, the waste liquids are sent to the cooling tower 200 by the pump 400 under the control of the temperature sensing controllers c and d, respectively, cooled, and then temporarily cooled. The waste liquid having a temperature lower than the set temperature is sent to the filtration equipment 100 by the filtration pumps a and b and subjected to a filtration treatment.
Into the diluting pond 40 and the second diluting pond 60, and mix the solvent NaClO ₂ and NaOH provided by the strong oxidant stock solution storage tank 80 and the weak alkali stock solution storage tank 90 with the supplementary soft water, respectively. A diluent is formed. Finally, the diluent is ejected by a single-stage or multi-stage spray set 22 to collect a waste liquid containing fine dust and a chemical reactant that has been completely condensed and settled, and a waste liquid treatment is performed. At the same time, resource saving can be achieved. Among them, the present embodiment employs a plate frame type pressure filter as the filtration equipment 100. Note that the diameter of the chimney main body 10 is smaller than the diameter of the reaction tower 20, and is provided on the same axis as the reaction tower 20, so that the waste gas generated by the combustion mechanism is sucked upward based on the principle of natural smoke emission. It has an excellent airflow rise effect.

In addition, manual drain valves 51 and 71 are provided at the bottoms of the first reservoir 50 and the second reservoir 70, respectively.
And a partial chemical reactant such as NaCl, HN
When O ₃ and NaHSO ₃ etc. reach the reservoir, a part is discharged from the filtration facility, and the other part is reused after being diluted with newly replenished water and used for about 3 to 4 months to obtain a concentration. Must be drained when it is relatively high, so they can be drained from a manual drain valve at the bottom of the reservoir, and the drain cannot be filtered and collected for reuse.

[0019]

As described above, the present invention provides a two-stage arrangement in the first and second compartments when waste air containing fine dust particles and harmful gas generated by the combustion mechanism flows into the reaction tower. Achieve the desired dust removal, desulfurization, and denitration effects by remarkably reducing fine dust and harmful gas in waste air through adhesion capture of multiple spray sets and demisters and double condensation and sedimentation. Can be. In addition, the waste liquid condensed and settled out,
After cooling, filtration, etc., further replenish soft water and solvent NaCl
Since it is mixed with O ₂ or NaOH to form a necessary diluent and reused, waste liquid can be treated and resources can be saved, and the diameter of the chimney body is smaller than the diameter of the reaction tower. In addition, since it is provided on the same axis as the reaction tower, waste gas generated by the combustion mechanism is sucked upward based on the principle of natural smoke emission, and an excellent effect of increasing the air flow is achieved.

[Brief description of the drawings]

FIG. 1 is a flow sheet of a relatively preferred embodiment of the present invention.

FIG. 2 is a side view of the reaction tower in the above embodiment.

FIG. 3 is a side sectional view of a conventional chimney structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Chimney main body 20 ... Reaction tower 21 ... Inlet 22 ... Spray set 23 ... Demister 24 ... 1st compartment 241 ... 1st drain 25 ... 2nd compartment 251 ... 2nd drain 26 ... inclined bottom part 27 ... soft water spray 30 ... partition plate 31 ... through-hole 32 ... ventilation cylinder 33 ... cone-shaped protective roof 40 ... first dilution pond 41 ... pH value sensor 50 ... first storage tank 51 ... manual drainage Valve 60 second diluting pond 61 pH sensor 70 second reservoir 71 manual drain valve 80 strong oxidant stock solution storage tank 90 weak alkaline stock solution storage tank 100 filtration equipment 200 cooling tower 300 Compressed air pipe 400 Pump a Second filtration pump b First filtration pump c Second temperature sensing controller d First temperature sensing controller e Second pump for diluting liquid f … First diluent pump g… Refillable

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FIF23J 15/00 K

Claims (9)

[Claims] 1. A reaction tower is provided at a lower end of a chimney main body, the inside of the reaction tower is divided into a plurality of compartments by a partition plate, and a plurality of spray sets communicating with corresponding dilution ponds are provided in each compartment. In one or more stages, a strong oxidizing agent (eg, NaClO ₂ ) diluting solution and a weak alkali (eg, NaOH) diluting solution supplied from each diluting pond are sent to respective corresponding spray sets by a pump and ejected.
The fine dust in the waste air introduced from the combustion mechanism is adsorbed and trapped, causing a chemical reaction with harmful gases (eg, sulfur oxides SO _x , nitrogen oxides NO _x, etc.) and draining to the lowermost end of each compartment. An opening is provided to discharge condensed and settled waste liquid containing fine dust and chemical reactants trapped and adhered, and if the discharged waste liquid is high in temperature, it is subjected to a cooling process and then cooled to a storage tank in order. And a chimney improvement mechanism capable of catching harmful substances of combustion waste gas, which flows into a diluting pond, is collected and reused after being filtered. 2. An inlet for introducing waste gas generated by a combustion mechanism is formed at a lower end of a reaction tower connected to a lower end of a chimney main body, and a demist is formed on a top of a plurality of spray sets provided inside the reaction tower. In a chimney structure equipped with a vessel, an oblique horizontal partition plate is provided at an appropriate height position in the reaction tower, for example, when the inside of the reaction tower is divided into two compartments,
The inside of the reaction tower is divided into a first compartment in the lower half and a second compartment in the upper half, and a plurality of spray sets are provided in the first compartment and the second compartment, respectively. Alternatively, the spray set of the first compartment is supplied with a strong oxidizing agent diluting solution via a pump from each of the communicating first diluting ponds, and is sprayed into a mist-like radiation distribution. Thereby, the fine dust in the waste air flowing in the first compartment is adhered and captured, and a chemical reaction is caused to oxidize the harmful gas containing NO, and at the same time, the lowermost end of the first compartment is formed. A first drain port is provided to allow the waste liquid condensed and settled to flow into the first reservoir, and a demister is formed at the top of the spray set in the second compartment, so that each spray set All of them are supplied with weak alkaline diluents via pumps from the second diluting ponds that communicate with each other. It erupted Jo of radiation distribution, and the fine dust in the waste gas which has flowed into the compartment of the second adhering capture, produce toxic gases and chemical reactions, such as sulfur oxides SO _x, nitrogen oxide NO _x, Further, a second drainage port is provided at the lowermost end of the second compartment to allow the condensed and settled waste liquid to flow into the second storage tank to perform the functions of desulfurization and denitration, and to pass through the center of each partition plate. A hole was opened, a hollow ventilation tube was extended upward along the periphery of the hole, and a conical protective roof through which gas could flow was attached to the upper end of the ventilation tube, and condensed and settled in the second compartment. A chimney improvement structure capable of preventing waste liquid from flowing to the first compartment, and capable of capturing harmful substances of combustion waste gas. 3. When each waste liquid condensed and settled in the reaction tower flows through the first drain port and the second drain port into the first reservoir and the second reservoir, respectively, and when the temperature is high. Once sent to the cooling tower, cooled, and returned to each reservoir,
Then, after being sent to the filtration equipment and filtered, respectively, they are led into the first dilution pond and the second dilution pond for further recovery and reuse, respectively. The required dilution liquid was formed by mixing with the solvent provided by the above and the replenishing soft water, and finally, the dilution liquid was ejected by the spray set in each of the first and second compartments, and flowed into each compartment. 3. The chimney improvement structure according to claim 2, wherein harmful substances can be oxidized and neutralized to reduce pollution, and resources can be saved by filtering and collecting waste liquid. 4. The harmful substance of combustion waste gas according to claim ₂ , wherein the strong oxidizing agent contained in the diluent of the first dilution pond is NaClO ₂ , KMnO ₄ , H ₂ O ₂ or the like. Chimney improvement structure. 5. The weak alkaline solution contained in the diluent of the second dilution pond is NaOH, Ca (OH) ₂ , or Mg.
The chimney improvement structure capable of capturing harmful substances of combustion waste gas according to claim 2, which is (OH) ₂ or the like. 6. The chimney capable of capturing harmful substances of combustion waste gas according to claim 2, wherein a soft water spray is provided above the demister in the second compartment to enhance the dust filtering effect. Improved structure. 7. The improved chimney structure according to claim 2, wherein the lower end surface of the reaction tower is provided at an inclined bottom portion. 8. The diluents of the first and second dilution ponds are mixed with the respective required solvent, the waste liquid after the filtration and recovery treatment, and the replenished soft water, and the required pH is measured by a pH sensor. 3. The chimney improving structure capable of capturing harmful substances of combustion waste gas according to claim 2, wherein the chimney is automatically adjusted to a value (dose) and is stirred and mixed by compressed air generated by a compressed air pipe. 9. The chimney improvement structure according to claim 3, wherein said filtering equipment is formed by a plate frame type pressure filter.