JPH0722671B2 - Exhaust gas treatment agent manufacturing method and exhaust gas treatment method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to various exhaust gas treatments, and more particularly to a method for producing an exhaust gas treatment agent containing NOx and an exhaust gas treatment method.

[Problems to be Solved by Conventional Techniques and Inventions]

Nitrogen in the air is oxidized during combustion of various fuels in air, and various nitrogen compounds, so-called NOx, are generated, which have a large effect on the environment.
Various researches have been conducted on NOx removal, that is, denitration method.

As a dry denitration method to which the present invention belongs, a novel denitration method using a hardened composition obtained from an inexpensive raw material by a relatively simple production method has been disclosed (JP-A-63-69523). However, improvement in the life of the denitration agent is still desired. An object of the present invention is to provide a method for producing an exhaust gas treating agent having improved denitration performance, desulfurization performance and the like in the same system, and an exhaust gas treatment method using the same.

[Means for Solving the Problems]

According to the present invention, calcium oxide, aluminum oxide, and silicon dioxide are further added with one or more substances selected from the group of substances capable of supplying a sulfuric acid compound, a halogen element compound, a sulfide, and a hydroxide of an alkali metal. , The exhaust gas reaction substance obtained by mixing with water and hydration treatment
Characterized in that it is treated with a gas containing ₂ , HCl, HF and / or NOx, and then washed with water or an aqueous alkali solution and / or its water suspension, separated from the washing solution, and then either dried or dried. A method for producing an exhaust gas treating agent, and an SO using the exhaust gas treating agent obtained by this method
_In the method for treating an exhaust gas containing ₂ , HCl, HF and / or NOx, the treated exhaust gas obtained by treating the exhaust gas reactant in the production of an exhaust gas treatment agent with the exhaust gas to be treated or the exhaust gas treatment agent. The exhaust gas treatment method is characterized in that

In the present invention, the substance capable of supplying calcium oxide is, for example, quick lime, slaked lime, lime carbonate, cement, slag, dolomite plaster (containing lime), and by-products such as acetylene slag.

The substance capable of supplying aluminum oxide is, for example, alumina, aluminum hydroxide, aluminum silicate, alum sulfate, alum, aluminum sulfide, aluminum sulfate,
Aluminum chloride, calcium aluminate, bentonite, kaolin, diatomaceous earth, zeolite, perlite,
Examples thereof include compounds containing reactive aluminum such as bauxite, sodium aluminate, cryolite, and aluminum cleaning residue (alcite).

The substance capable of supplying silicon dioxide is, for example, silicic acid, hydrous silicic acid, metasilicic acid, aluminum silicate, water glass, calcium silicate and cristobalite, tridymite, kaolin, bentonite, talc, perlite, shirasu, diatomaceous earth, glass. , Compounds containing reactive silicon dioxide such as incinerated ash such as fir shell ash and wood ash.

In addition, as examples of substances that can simultaneously supply at least two or more of the above-mentioned three types of compounds, coal ash and volcanic ash, coal fluidized bed combustion ash (calcium oxide, silicon dioxide, aluminum oxide source), cement and cement clinker ( Calcium oxide, silicon dioxide, aluminum oxide source),
Reactive silicon dioxide such as slag and shirasu, andesite, chert, quartz trachyte, opal, zeolite, feldspar, clay mineral, ettringite (silicon dioxide, aluminum oxide, calcium oxide source), and oxides such as aluminum and calcium, Minerals containing chloride, sulfate, etc.,
Used desulfurization agents for in-furnace desulfurization ash such as fluidized bed combustion ash and flue desulfurization, sludge incineration ash, municipal waste incineration ash, cement waste, acetylene slag, and used wastewater treatment agent. Here, the spent desulfurization _{agent, CaO, Ca (OH) 2} , CaCO 3 as the used calcium-based desulfurizing agent, such as and JP 61-
A used desulfurizing agent composed of CaO, Al ₂ O ₃ , SiO ₂ , and CaSO ₄ composition shown in 209038 is used.

Table 1 shows examples of chemical compositions of these representative raw materials.

The group of substances capable of supplying a sulfuric acid compound, a halogen element compound, a sulfide and a hydroxide of an alkali metal are gypsum, magnesium sulfate, calcium chloride, magnesium chloride,
Sodium sulfate, calcium sulfite, calcium hydrogen sulfate, sodium chloride, strontium chloride, calcium bromide, calcium iodide, potassium chloride, sodium thiosulfate, sodium hydrogen carbonate, calcium hydrogen carbonate, calcium sulfide, iron sulfide, zinc sulfide, hydroxide Sodium and potassium hydroxide are preferred, and gypsum and sodium hydroxide are particularly preferred.

The ratio of the above components in the cured product is (when CaSO ₄ is included) CaO (and CaSO ₄ ) as CaO of 1 to 90%, Al ₂ O ₃ of 2 to 70%, and SiO ₂ of 2 to 90%. Preferably, CaO is ₂ to 80%, (CaSO ₄ is 0.1 to 70%), Al ₂ O ₃ is 5 to 70%, and SiO ₂ is 5 to 80%.

If one or more substances selected from the group of substances capable of supplying sulfuric acid compounds other than gypsum, halogen element compounds, sulfides, and hydroxides of alkali metals are added, 1 of Na ₂ SO ₄ and CaCl ₂ NaCl is added. 0.1 to 50% of species or more is preferable as sulfide, preferably 0.1 to 50% of calcium sulfide, and preferably 0.1 to 10% of NaOH and / or KHO as hydroxide of alkali metal.

In the present invention, the hydration treatment means a treatment necessary for proceeding the hydration reaction between the above-mentioned substances (raw materials), for example, as disclosed in JP-A-64-38130. Normal temperature water or hot water curing, wet air curing, steam curing, etc. are included and are classified into a hardening hydration treatment and a non-consolidating hydration treatment.

Curable hydration treatment is to reduce the ratio (solidification) of the raw materials and water at the time of treatment to, for example, 1: 0.2 to 1: 0.80 to promote the bonding between the material particles and to obtain a cured product. Hydration treatment for obtaining

The non-consolidating hydration treatment is a treatment that prevents the material particles from binding to each other during the hydration treatment to grow into coarse particles, and the solid-liquid ratio at the start of the treatment is increased, for example, 1: 1.5 ~. 1:20, in hot water curing, disperse the raw material in water at 40 ℃ ~ 180 ℃,
Stirring, bubbling, so that the raw materials do not precipitate and harden at the bottom,
This is a process of circulating or shaking for several minutes to several days.

In the hydration treatment process, after a sufficient amount of water necessary for the formation of the active substance in the treatment agent is given, the step important for the formation of the active compound necessary for exhaust gas purification is completed. Alternatively, most is consumed in the compound formation reaction.

Wet air curing in the curable hydration treatment is performed at a temperature of 10 ° C to 40 ° C.
Relative humidity of 50% to 100% for a few minutes or tens of days is preferable, and steam curing is performed at a temperature of 40 ° C to 180 ° C and a relative humidity of 1%.
At 00%, it is preferably several minutes to several days.

The treatment with a gas containing SO ₂ , HCl, HF, and / or NOx is performed at a temperature of 20 ° C. to 500 ° C. containing 10 ppm to 90% of these gases.
Gas for 5 hours to 50,000 h ^-1 at a time sufficient to contact with at least 1 mol of these gases alone or in a mixture per kg of exhaust gas reactant, and the exhaust gas to be usually treated (exhaust gas to be treated) Can be used.

The shape of the exhaust gas reaction substance is 0.1 mm, such as powder produced by evaporation of slurry and powder obtained by powder spraying.
The following fine particles and particles of 0.1 mm to several tens of mm are used.

The washing treatment uses water or an aqueous solution or suspension of an alkali. The alkali is a hydroxide or carbonate of an alkali metal and / or an alkaline earth metal, and an aqueous solution thereof and / or an aqueous suspension thereof is used. The concentration of the liquid during the cleaning treatment, the treatment time, the specific method of the treatment and the like are not particularly limited, but the treatment liquid temperature is in a wide range from 5 ° C. to 180 ° C., preferably 50 ° C. to 150 ° C. By this cleaning treatment, CaSO ₄ , CaCl ₂ , NaCl, NaCO in the exhaust gas reaction substance
₃ , "Catalyzed substances" such as Ca (NO ₃ ) ₂ react with the exhaust gas reaction substances and the treated gas, and the "produced substances" are eluted, and the voids increase especially near the surface of the particles and the gas diffuses inside the particles. It will be easier. Therefore, it is preferable to elute as much of the "produced substance" as possible, and it is a feature of the present invention that the exhaust gas reaction substance is separated from the cleaning liquid containing these eluted substances.

When the cleaning solution is an aqueous solution of alkali and / or its water suspension, the alkali substance is retained by the exhaust gas reaction substance, but it may be simply physically adsorbed or chemically reacted with the components of the exhaust gas reaction substance. It is not clear whether they are combined. However, it is clear that some reaction is progressing from the fact that the curing strength of the particulate exhaust gas reactant after treatment increases. Further, whether this treatment promotes the reaction of NOx with the constituent components of the exhaust gas treating agent or the adsorption of NOx to the exhaust gas treating agent, or the retained alkaline substance is NOx in the exhaust gas or the exhaust gas reactive substance obtained by treating the exhaust gas. There is no confirmation as to whether or not it reacts with NOx (released into the air from the exhaust gas reaction substance under specific conditions) or its compound, but in any case, as in the examples described later, It is clear that it is effective in removing NOx, is effective in increasing the strength of the particulate exhaust gas reactant after treatment, and has a significant effect in removing SO ₂ and HF.

For the gas treatment of the exhaust gas reaction substance, the obtained exhaust gas treating agent may be a gas to be treated or a gas after being treated with the exhaust gas treating agent. Regarding the exhaust gas reaction substance before the cleaning treatment, the applicant has already disclosed in JP-A-61-209038 and 62-9764.
0, 62-213842, 62-254824, 63-69523, 64-38130, 6
As disclosed in 4-80425, since it has the ability to treat exhaust gas such as desulfurization and denitration, it can be assembled into the exhaust gas treatment system shown in FIGS.

That is, in FIG. 1, the exhaust gas reactant S
First removes the treated exhaust gas G containing NOx, SO ₂ , HCl, and / or HF with the first abatement device 1, and is itself treated with the treated exhaust gas, and then the cleaning treatment device 3 Treated with water or an aqueous solution of alkali and / or its water suspension (cleaning liquid) A, and the exhaust gas treating agent R of the present invention is treated.
Further, it is effective in removing the harmful gas remaining in the exhaust gas to be treated, which is filled in the second abatement device 2, mainly in denitration.

In FIG. 2, the exhaust gas reaction material S is first filled in the second abatement device 2 and passed through the first abatement device 1, NOx, SO ₂ ,
The remaining exhaust gas to be treated containing HCl and / or HF is removed, and the exhaust gas treatment agent 3 of the present invention is treated with the exhaust gas to be treated, and then treated with the cleaning liquid A in the cleaning treatment device 3 to become the exhaust gas treating agent R of the present invention. Next, the first abatement device 1 is filled to perform a primary abatement of the exhaust gas to be treated as a treating agent having an enhanced denitration ability.

In FIG. 3, the exhaust gas to be treated passes through the abatement device in the order of the first, second, and third abatement devices. The exhaust gas reaction substance S is first filled in the second abatement device 2 and passed through the first abatement device NO.
The secondary detoxification treatment of the exhaust gas to be treated, in which x, SO ₂ , HCl and / or HF remains, is carried out by itself, and is treated with this treated gas, and then with the cleaning liquid A in the cleaning treatment apparatus 3. The exhaust gas treating agent R of No. 1 is used as the exhaust gas treating agent R, which is then filled in the first abatement device 1 to perform a primary abatement of the exhaust gas to be treated as a treating agent having an enhanced denitration capability. Further, the treating agent whose denitrification ability is lowered is washed with the washing liquid A in the washing treatment device 3,
The process of recovering the denitration capacity and filling the third detoxification device 4 to perform the third detoxification of the gas to be treated is shown.

The exhaust gas treating agent will be described in detail below with reference to examples.

〔Example〕

Example 1 51 parts by weight of coal ash (overseas coal) (AlO ₃ 22%, SiO ₂ 64%), Ca
(OH) ₂ 30 parts by weight, CaSO ₄ 19 parts by weight To a powdery material, 45 parts by weight of water was added and kneaded, steam-cured at 95 to 100 ° C for 12 hours, and 130 ° C.
After being dried for 2 hours, it was crushed to obtain a particulate exhaust gas reaction material having a particle size of 3.36 to 4.76 mm.

This exhaust gas reaction substance is the gas shown in Table 2, and SV1000
It was treated at h ^{-1 at} a temperature of 130 ° C for 200 hours, then cooled to room temperature, and 40 g of it was suspended in ₂ g of Ca (OH) ₂ in pure water 2.
Pour into the supernatant liquid (1) after leaving for a minute, keep the liquid temperature at 20 ° C, wash occasionally by stirring for 30 minutes, and then separate the particulate exhaust gas reaction substances by filtration through a stainless steel mesh with an opening of 3 mm. And an exhaust gas treating agent (Example 1-1) brought to a surface dry state,
Exhaust gas treating agent dried at 100 ° C for 1 hour (Example 1-2)
Got Furthermore, after the supernatant liquid (washing liquid) temperature was set to 95 ° C. and the same treatment was performed, the particulate exhaust gas reaction substance was taken out, and the exhaust gas treating agent (Example 1-3) was brought to the surface dry state and 100 ° C.
The exhaust gas treating agent (Example 1-4) dried for 1 hour was obtained. 30 ml of these exhaust gas treating agents (bulk specific gravity 0.9) were filled in a test device, and the gas shown in Table 2 was added to SV2000 (h ^-1 ),
The mixture was passed at a temperature of 130 ° C., and the NOx and SO ₂ concentrations in the inlet and outlet gases were measured to determine the denitration and desulfurization rates. Furthermore, the NOx and SO ₂ concentrations in the treatment liquid were measured to determine the denitration and desulfurization rates. Further, NO ₃ ⁻ and SO ₄ ⁼ concentration in the cleaning liquid were also measured, and the results are shown in Table 3.

The agent of the comparative example is one which was not washed in each example (the same applies to Tables 4 to 11).

Table 2 SO ₂ (ppm) 900 NOx (ppm) 450 O ₂ (%) 6 CO ₂ (%) 13 H ₂ O (%) 10 N ₂ (%) Balance Example 2 The particulate exhaust gas reaction material obtained in Example 1 was treated with the gas shown in Table 2 at SV1000h ⁻¹ and a temperature of 130 ° C. for 200 hours, and then cooled to room temperature, and 40 g thereof was treated with Ca ( OH) ₂ 20 g was poured into a liquid suspended in pure water 2, stirred occasionally to perform washing with different treatment temperature and treatment time, and then separated by filtration with a 3 mm mesh stainless steel mesh, A particulate exhaust gas treating agent in a dry state was obtained. Treatment at 20 ° C. liquid temperature for 30 minutes Example 2-
1 and the treatment at 95 ° C. liquid temperature for 30 minutes was designated as Example 2-2.
Example 2-3 was treated at a liquid temperature of 95 ° C. for 60 minutes.

The agents of Examples 2-1, 2-2 and 2-3 were further added 10 times, respectively.
Those dried at 0 ° C. for 1 hour were designated as Example 2-4, Example 2-5, and Example 2-6, respectively.

Performance tests of these exhaust gas treatment agents and N in the cleaning liquid
The measurement of O ₃ ⁻ and SO ₄ ⁼ concentration was performed in the same manner as in Example 1.

The test results are shown in Table 4.

Example 3 The particulate exhaust gas reaction material obtained in Example 1 was treated with the gas shown in Table 2 at SV1000h ⁻¹ and a temperature of 130 ° C. for 200 hours, and then cooled to room temperature, 40 g of which in water 1. In addition to maintaining the liquid temperature at 20 ° C or 95 ° C, occasionally stirring and washing for 30 minutes, the particulate exhaust gas reaction substance is filtered through a stainless mesh with a mesh of 3 mm, separated, and separated into a surface-dried exhaust gas. With treatment agent,
The 20 ° C. liquid temperature treatment was designated as Example 3-1 and the 95 ° C. liquid temperature treatment was designated as Example 3-2.

Exhaust gas treating agents obtained by further drying the agents of Examples 3-1 and 3-2 at 100 ° C. for 1 hour were designated as Example 3-3 and Example 3-4, respectively.

Performance tests of these exhaust gas treatment agents and N in the cleaning liquid
The measurement of O ₃ ⁻ and SO ₄ ⁼ concentration was performed in the same manner as in Example 1.

The test results are shown in Table 5.

Example 4 The particulate reaction substance obtained in Example 1 was treated with the gas shown in Table 2 at SV1000hr ⁻¹ and a temperature of 130 ° C. for 200 hours, and then cooled to room temperature, and 40 g thereof was treated with CaCO ₃ 2g. Is suspended in pure water of water 1 and allowed to stand for 5 minutes, then added to supernatant liquid 1 and the liquid temperature is adjusted to 95 ° C.
After washing with stirring for 30 minutes with occasional stirring, the particulate reaction substance was separated by filtration through a stainless steel mesh having an opening of 3 mm, and the exhaust gas treating agent (Example 4-1) brought to the surface dry state and 100 ° C. An exhaust gas treating agent (Example 4-2) dried for 1 hour was obtained.

Performance tests of these exhaust gas treatment agents and N in the cleaning liquid
The measurement of O ₃ ⁻ and SO ₄ ⁼ concentration was performed in the same manner as in Example 1.

The test results are shown in Table 6.

Example 5 The particulate reaction material obtained in Example 1 was treated with the gas shown in Table 2 at SV1000hr ⁻¹ and a temperature of 130 ° C. for 200 hours, and then cooled to room temperature, and 40 g thereof was treated with NaOH0. Add 2g to the aqueous solution of 2 in pure water, keep the liquid temperature at 95 ° C, wash occasionally for 30 minutes with stirring, and then filter and separate the particulate reaction material with a stainless mesh with an opening of 3mm, An exhaust gas treating agent in a dry state (Example 5-1) and an exhaust gas treating agent dried at 100 ° C. for 1 hour (Example 5-2) were obtained.

Performance tests of these exhaust gas treatment agents and N in the cleaning liquid
The measurement of O ₃ ⁻ and SO ₄ ⁼ concentration was performed in the same manner as in Example 1.

The test results are shown in Table 7.

Example 6 After 37.8 parts by weight of CaO (50 parts by weight of Ca (OH) ₂ equivalent) was added to 500 parts by weight of water for sufficient digestion, 30 parts by weight of coal ash (overseas coal) shown in Table 1 was used. After adding 20 parts by weight of the exhaust gas reaction substance in this order and performing hydration curing in hot water at 95 ° C to 100 ° C for 12 hours, solid-liquid separation is performed with a vacuum dehydrator and crushing with an attritor.
After drying, a powdery exhaust gas reaction substance having a size of 0.1 mm or less was obtained.

The powdery exhaust gas reaction material was sprayed into the gas shown in Table 2 and the powdery exhaust gas reaction material was collected by a bag filter.
The collected exhaust gas reaction material was repeatedly used and taken out when the desulfurization rate after passing through the bag filter was 10% or less. Using this used powdered exhaust gas reaction substance as a comparative example,
The performance test shown below was performed. The results are shown in Table 8.

Then, cool the used powdered exhaust gas reaction material to room temperature,
40 g of it was added to a liquid prepared by suspending ₂ g of Ca (OH) ₂ in normal water 2, the liquid temperature was kept at 95 ° C., occasionally stirred and washed for 30 minutes, and then solid-liquid separated with a vacuum dehydrator, After drying at 100 ° C for 1 hour,
The adhered particles were separated by a centrifugal pulverizer to obtain an exhaust gas treating agent.

As for the performance of the agent, 10 g of this exhaust gas treating agent was dispersed and adhered to 5 g of absorbent cotton, filled into a Pyrex glass reaction tube of 32 mmφ x 180 mm in height, and the gas shown in Table 2 was passed at a temperature of 130 ° C in the inlet and outlet gases. The NOx and SO ₂ concentrations were measured to determine the denitration and desulfurization rates. Further, NO ₃ ⁻ and SO ₄ ⁼ concentration in the cleaning liquid were also measured, and the test results are shown in Table 8.

Example 7 Exhaust gas treating agent obtained in Example 1, 1-1, 1-2, 1-
The same test conditions as in Example 1 except that the SO ₂ concentration and the NOx concentration in the treatment gas before cleaning and the test gas (gas shown in Table 2) were changed to 800 ppm and NOx concentration to 100 ppm. Exhaust gas treatment test was carried out in Example 7-1,
It is shown in Table 9 as 7-2, 7-3 and 7-4.

Example 8 An exhaust gas treating agent of the present invention was obtained in the same manner as in Example 1, except that the composition of the treated gas of the exhaust gas reaction substance was set as Table 6 and the treating time was changed to 150 hours.

That is, the agents corresponding to Examples 1-1, 1-2, 1-3, 1-4 were used as the agents of 8-1, 8-2, 8-3, 8-4, respectively. An exhaust gas treatment test was conducted on these under the same test conditions as in Example 1, and the results shown in Table 10 were obtained.

Table 6 HCl 910ppm NOx 80ppm SO ₂ 60ppm CO ₂ 6% O ₂ 14% N ₂ balance Example 9 Coal ash (overseas coal) (Al ₂ O ₃ 22%, SiO ₂ 64%), 68 parts by weight, Ca (OH) ₂ 30 parts by weight After kneading by adding 25 parts by weight of water , 10 parts by weight of water was added to 2 parts by weight of NaOH, the solution was added and kneaded again, and after molding with an extrusion molding machine using a die with a hole diameter of 4 mm, it was cured at room temperature for 30 minutes under normal temperature and humidity, and then cured.
Steam cure at 95-100 ℃ for 12 hours, dry at 130 ℃ for 2 hours,
A particulate exhaust gas reactant having a diameter of 4 mm and a length of about 4 mm was obtained.

This exhaust gas reaction material is SV 1,000h ^-1 , with the gas shown in Table 2,
The mixture was treated at a humidity of 130 ° C for 200 hours and then cooled to room temperature. 40 g of the suspension was suspended in ₂ g of Ca (OH) ₂ in pure 2 and allowed to stand for 5 minutes. Is maintained at 20 ° C., washed occasionally with stirring for 30 minutes, and the particulate exhaust gas reaction substance is separated by filtration through a stainless steel net having an opening of 3 mm to obtain a surface-dried exhaust gas treatment agent (Example 9-1). ) And 10
An exhaust gas treating agent (Example 9-2) dried at 0 ° C for 1 hour was obtained. Further, after the extraction treatment liquid temperature was set to 95 ° C. and the treatment was carried out at the same time, the particulate exhaust gas reaction substance was taken out, and the exhaust gas treatment agent was dried in the surface state (Example 9-3) and the exhaust gas treatment agent dried at 100 ° C. for 1 hour. (Example 9-4) was obtained.

The test equipment was filled with 30 ml of these exhaust gas treating agents (bulk specific gravity: 0.95), and the gas shown in Table 2 was added at SV2,000 (h ^-1 ) and temperature.
NOx and SO in the inlet and outlet gases passed at 130 ° C
The concentration of ₂ was measured to determine the denitration and desulfurization rate. Further, NO ₃ ⁻ and SO ₄ ⁼ concentration in the cleaning liquid were also measured, and the results are shown in Table 11.

[Effects of the Invention] The denitration rate by the exhaust gas treating agent of the present invention is not high at 50% or less, but the performance is remarkably low in spite of the fact that the exhaust gas treating ability remains with a simple device and operation. It is possible to activate and reuse used exhaust gas reaction substances that had to be disposed of in the past. That is, the already deteriorated ability such as denitration can be effectively brought out, and the temperature at the time of denitration can be low, so that its practical value is extremely large.

[Brief description of drawings]

1 to 3 are basic conceptual diagrams of an exhaust gas treatment system incorporating the method of the present invention. 1 ... First abatement device, 2 ... Second abatement device, 3,3 '... Washing treatment device, 4 ... Third abatement device, G ... Exhaust gas to be treated, S ... Exhaust gas reaction substance , R ... Exhaust gas treatment agent, A ... Cleaning liquid.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication location B01D 53/81 B01J 20/10 C 7202-4G (72) Inventor Toshiya Kodama Satozuka, Toyohira-ku, Sapporo-shi, Hokkaido 461 Address 6 North Research Institute of Electric Power Co., Ltd. (72) Inventor Hideki Nakamura 461 Satoka, Toyohira-ku, Sapporo-shi, Hokkaido 461 Address 6 Research Institute of North Kaido Electric Power Co., Ltd. (72) Tomohiro Ishizuka 461 Satozuka, Toyohira-ku, Sapporo, Hokkaido 6 North Research Institute of Electric Power Company

Claims (3)

[Claims] 1. A substance capable of supplying calcium oxide, aluminum oxide, and silicon dioxide, and one or more substances selected from the group of substances capable of supplying a sulfate compound, a halogen element compound, a sulfide, and a hydroxide of an alkali metal. In addition, the exhaust gas reaction substance obtained by mixing with water and hydration treatment,
After being treated with a gas containing SO ₂ , NOx, HCl and / or HF, it is washed with water or an aqueous alkaline solution and / or an aqueous suspension of alkali, and then separated from the washing solution and then dried as it is. A method for producing an exhaust gas treating agent. 2. The method according to claim 1, wherein one or more substances selected from the group of substances capable of supplying a sulfuric acid compound, a halogen element compound, a sulfide and a hydroxide of an alkali metal is calcium sulfate. 3. An exhaust gas treatment method for treating an exhaust gas containing SO ₂ , NOx, HCl and / or HF with the exhaust gas treatment agent obtained by the production method according to claim 1, wherein the exhaust gas reaction substance in the production of the exhaust gas treatment agent. An exhaust gas treatment method, wherein the gas treatment is performed on the exhaust gas to be treated or the exhaust gas to be treated after being treated with the exhaust gas treating agent.