KR20060025591A - A lavation system for incinerator - Google Patents

Abstract

The present invention relates to a cleaning liquid production system in a scrubbing dust collector used for removing air pollutants, in particular dioxin, HCl and SOx, in an incinerator.

One of the most important things in an incinerator is to prevent the generation of pollutants at the source. One of the most important processes is dust collection through cleaning. In order for dust collection to work properly, an excellent cleaning solution must be provided. In other words, the production of effective cleaning solutions is essential for incinerator systems.

The cleaning liquid production system in the cleaning dust collection facility for the removal of dioxins and HCl and SOx generated in the incinerator according to the present invention is excellent in the ability to collect air pollutants through cleaning, excellent durability and low cost It has

Incinerator, Cleaning, Dioxin

Description

Cleaning solution production system in scrubbing dust collector used in incinerator {A lavation system for incinerator}

BRIEF DESCRIPTION OF THE DRAWINGS The process figure of the washing | cleaning liquid manufacturing system in the washing | cleaning dust collection facility used by the incinerator by this invention.

The present invention relates to a cleaning liquid production system process in a cleaning dust collection facility used in an incinerator.

Incinerator means the general term of the apparatus for incineration of dust, solid waste of a factory, waste gas, sludge, sludge cake, etc. of a waste water treatment facility. The classification of waste by incineration method is as follows. That is, ① fire-fired natural combustion method ② fixed-phase combustion method ③ multi-stage combustion method ④ rotary incinerator method ⑤ fluidized-phase combustion method (流動床 燃燒 方式) ⑥ There is a spray combustion method. Among them, ① and ② have a continuous combustion method that can incinerate waste continuously and a batch combustion method that cannot continuously incinerate. Most small incinerators are batch type. This is a non-continuous way of placing a certain amount of incinerators in an incinerator, incineration and recovery of ash. On the other hand, the methods of ③ to ⑥ are all continuous. The incinerator of the HALL natural incinerator has a lattice supporting the incinerator at the lower part, and combustion air flows into the gap between the lattice to cool the grate and simultaneously drop the burned ash to the lower part of the incinerator. In recent years, large garbage incinerators in cities have a way of moving or mixing wastes by moving the grate. Grate incinerators are suitable for incineration of low-calorie waste, but melting them at low temperatures, such as plastic, can lead to grate gaskets or block grate gaskets, which can impede aeration or ash fall, thereby improving the grate. Therefore, there is no grate for incineration of plastics or oil sludge having a low melting point, and an incinerator of a fixed-phase combustion method in which a fireproof material is coated on an incinerator bed is used. This method is suitable for incineration of wastes with low ash and low melting point, since it is difficult to continuously remove the incineration ash. The multi-stage combustion method is spreading as an incinerator for sewage sludge. Cylindrical incinerators with 6 to 8-stage shelves with a rotating shaft, where the waste introduced at the top is dried while falling and burned at the bottom. On the other hand, the incineration method by rotating the cylinder to mix the combustion products is a rotary incinerator method. It is suitable for burning sludge or low calorie waste containing a large amount of water. It is an improvement of the waste incinerator, which was widely used as a baking furnace for cement production. In addition, the fluidized bed combustion method is provided with a plurality of air outlets on the road, and non-combustibles such as sand are flowed by the air ejected from the outlets to burn waste therein. The flowing sand is initially heated by a burner and combusted by introducing the crushed waste into the heated heat flux. The furnace is easy to operate and manage and is completely burned, so it has recently been used as an urban waste incinerator. However, treatment before incineration such as crushing and screening is necessary. The spray combustion method incinerates liquid waste by injecting mist from the nozzle, and is suitable for incineration of liquid combustibles that can be pumped. It is used for incineration of oily substances, waste solvents and organic chlorine compounds.

Existing incinerators are equipped with a scrubber to prevent the release of air pollutants, but it is difficult to remove pollutants because there is no separate cleaning solution manufacturing system and the system is not good.

The present invention has been made to solve the above problems of the prior art, to improve the efficiency of removing contaminants such as dioxins, HCl and SOx and to improve the durability, there is no residual trouble, to provide an optimized cleaning solution production system .

The present invention relates to a cleaning liquid production system process in a cleaning dust collection facility used in an incinerator.

The rotary kiln incinerator is an example of the various incinerators.

When the waste is introduced into the input crane, it is rotated through the rotary kiln and transported to the grate incinerator. After incineration, the emissions pass through a non-catalytic reactor and then through a boiler. Substances discharged from the boiler pass through a semi-dry scrubbing tower, then move to a dry reaction facility, and the material that has passed through the dry reaction facility is collected through the bag filter. After the collection, the remaining material is moved to the cleaning dust collection facility. At this time, in the cleaning liquid mixing tank installed at the bottom of the cleaning dust collection facility, caustic soda and activated carbon are mixed in an appropriate ratio to prepare an effective cleaning solution. The cleaning solution thus prepared is put into a cleaning dust collecting facility. At this time, caustic soda in the added washing solution serves to remove HCl and SOx, and activated carbon plays a role of removing dioxins. The cleaning liquid used is again passed through the cleaning liquid mixing tank and then re-injected into the semi-dry cleaning tower. The cleaning liquid used in the semi-dry washing tower is moved to the bag filter facility and reused. Through such a circulation structure, the cleaning solution prepared through the cleaning solution mixing tank is not reused once, but is recycled through the entire incinerator system.

Looking at the physical properties of the cleaning solution as follows.

The formula of caustic soda is NaOH. It is a hydroxide of sodium, and has a molecular weight of 40.0. It is a strong basic colorless solid prepared by the causification of sodium carbonate and the electrolysis of sodium chloride. It is also called caustic soda because of its strong corrosiveness, and it is commercially available as a pellet product as a reagent. Strong deliquescent, pure is colorless transparent crystals, but is usually a slightly opaque white solid with impurities. It is a tetragonal (alpha) type (low temperature type) at room temperature, and it transitions to a cubic form (high temperature type) at 299.6 degreeC. The melting point of fully dehydrated water is 328 ° C, which is as low as about 10 ° C because it contains a small amount of water and carbonate, which is actually very difficult to remove. It has a boiling point of 1390 ° C., specific gravity of 2.130, refractive index of 1.3576, heat of fusion of 1.70 dl / mol, and production heat of 102.7 dl / mol. 1, 2, 3, 3.5, 4, 5 and 7 hydrates are known and 3.5 hydrate is a colorless monoclinic crystal with melting point of 15.5 ℃. It dissolves well in water and generates a large amount of heat when dissolved, and the aqueous solution has a strong basicity. Solubility in 100 g of water is 42 g at 0 ° C., 109 g at 20 ° C., and 347 g at 100 ° C. Easily soluble in ethyl alcohol and glycerol, but insoluble in ether, acetone and liquid ammonia. It is deliquescent and, when left in the air, absorbs moisture and carbon dioxide and turns into sodium carbonate. The resulting sodium carbonate is difficult to dissolve in the concentrated sodium hydroxide solution, and this property can be used to make an aqueous sodium hydroxide solution containing no carbonate. On the contrary, since this property becomes disadvantageous for the absorption of carbon dioxide, a potassium hydroxide solution is usually used which does not have a risk of depositing carbonate. It is also very stable against heat and does not decompose into water and oxides even when strong heat is applied. When dissolved together with poorly soluble silicates, phosphates, and sulfates (eutectic; alkali melting), water-soluble sodium salts are formed and used for such dissolution. However, since sodium hydroxide in the molten state corrodes gold and platinum, crucibles made of silver and nickel, which have high resistance to sodium hydroxide at high temperatures, are used for alkali melting. Sodium hydroxide reacts with fluorine at low temperature to produce sodium fluoride, water and oxygen, and reacts with chlorine, bromine and iodine to produce various halide oxides at low temperature and sodium halide at high temperature. Reaction with sulfuric acid reacts sodium sulfide and sodium thiosulfate with selenium to produce sodium selenide and sodium selenite. Reaction with phosphorus reacts with sodium phosphide, phosphine and phosphoryl compounds, and arsenic to form sodium arsenite and hydrogen arsenide. When carbon and strong heat are applied, it is reduced to produce sodium and carbon monoxide. When combined with calcium, it is reduced to form sodium. The concentrated aqueous solution reacts with silicon to produce sodium silicate and hydrogen. The aqueous solution reacts with the ammonium salt to liberate ammonia and precipitate the hydroxide in most aqueous metal salt solutions. Since hydroxides such as lead, antimony, tin, aluminum, chromium, and zinc are amphoteric, the precipitate dissolves in excess sodium hydroxide. Sodium hydroxide also reacts with carbon monoxide to form sodium formate, saponifying fats and oils to produce soap (sodium fatty acid) and glycerol. In addition, the decomposition of organic substances such as proteins and cellulose is strong.

Activated carbon is a black carbonaceous material with strong adsorption. It is composed of amorphous or microcrystalline carbon and is characterized by many fine pores. The pore diameter is about 0.1 to 10,000 nm, and the volume is 0.6 to 0.8 cm 3 per gram. The internal surface area formed by many holes is the largest of all porous materials, and may reach 500-1500 m2 per gram. Adsorption capacity results from the formation of complex compounds in which oxygen, hydrogen, nitrogen, sulfur, and halogen combine with carbon in these numerous pores and the inner surface thereof. 1 g of activated charcoal made of palm bark adsorbs 2000 ml of hydrogen at 0 ° C and 1 atm. Molecules to be adsorbed are adsorbed on the surface of a large number of adsorbent pores of 1 to 2 nm through a passage where the pores of activated carbon are relatively large. Therefore, the pore size is adjusted according to the object to be adsorbed, so that activated carbon uses a lot of large pores for molecules such as pigment and many small pores for molecules such as gas. Physically and chemically stable, resistant to acid and alkalinity, insoluble in various organic solvents. Powdered activated carbon is widely used in the liquid phase. It is used for deodorizing, discoloring, and refining in oil, rubber, dye, sugar, and glutamic acid. Discard once used. Granular activated carbons include cylindrical and spherical particles of 2 to 5 mm and crushed coals of 4 to 100 mesh. It is used for the same purpose as powder, and is also used for recovery of solvent in gas phase and removal of toxic gas and dust. Recently, methods for regeneration after adsorption for pollution prevention, such as sulfur dioxide in purified water, wastewater treatment, and exhaust gas, have been developed. In addition, there are special activated carbons such as catalyst carriers and molecular sieves.

As mentioned above, caustic soda used as a constituent of the cleaning solution removes HCl and SOx, and activated carbon plays a role of removing dioxin. It can be effectively removed, and the cleaning solution used is very economical because it can be reused while circulating the incinerator process without being done once.

The cleaning solution production system of the cleaning equipment in the rotary kiln type incinerator described above is just one example and can be applied to other incinerators as well.

In this way, the system for the cleaning liquid manufacturing apparatus of the cleaning dust collecting facility for removing contaminants generated in the incinerator can maximize the cleaning efficiency and achieve the recycling of resources through the circulation system of the cleaning liquid. In addition, it can be manufactured at a low price and has the advantage of easy repair and repair.

It also has the advantage of effectively removing dioxins, HCl and SOx from air pollutants.

Although the invention has been described in detail only with respect to the described embodiments, it will be apparent to those skilled in the art that modifications and variations can be made within the spirit and scope of the invention, and such variations or modifications will belong to the appended claims. .

Claims (1)

In the washing liquid mixing tank, caustic soda, activated carbon and the like are mixed in an appropriate ratio to prepare an effective washing liquid; The cleaning solution thus prepared is introduced into the cleaning dust collection facility and the used cleaning solution is again introduced into the semi-dry cleaning tower; The cleaning liquid used in the semi-dry scrubbing tower is reused in the bag filter; The cleaning liquid produced through the cleaning liquid mixing tank through this circulation structure is configured to be reused while circulating the entire incinerator system without being used for one time. "The cleaning liquid manufacturing system in the cleaning dust collector used in the incinerator."

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