Method for purification treatment of acid gas from waste incineration

Abstract

A method for purification treatment of acid gas from waste incineration, comprising the following steps: a deacidification dust remover (100) is mounted; flue gas generated after waste incineration is introduced into a deacidification tank (101), gas escaping after preliminary neutralization of the deacidification tank (101) rises under the spraying effect of an alkali liquor, and the sprayed alkali liquor falls into the deacidification tank (101) for recycling; and the gas passes through multiple layers of acid gas adsorption films (104) layer by layer during the spraying of the alkali liquor, and is finally discharged from a gas outlet (105) of the deacidification dust remover (100), so as to complete an acid gas purification treatment process.

Description

Method for purifying acidic gas from waste incineration Technical Field

[0001] The present invention relates to the technical field of waste incineration, and more particularly to a method for purifying acidic gas from waste incineration. Background Art

[0002] The main methods for treating garbage include landfill, composting, incineration, etc. In recent years, with the development of my country's economy, the amount of domestic garbage and the calorific value of garbage have increased, and incineration has become the most effective method for treating garbage. However, the exhaust gas generated by garbage incineration contains many harmful substances, especially acidic gases. If it is not effectively purified, it will have a serious impact on the air quality. In the prior art, for example, the invention patent application with application publication number CN104307295A discloses a method for treating exhaust gas from garbage incineration, which adopts two-stage wet deacidification and dust removal, and is supplemented by a bag filter and activated carbon to absorb and purify the flue gas. However, the cloth surface of the bag filter is easily solidified and difficult to peel off, resulting in a decrease in the air permeability of the bag, affecting the purification effect.

[0003] Summary of the Invention

[0004] One object of the present invention is to provide a method for purifying acidic gases from waste incineration, which can effectively prevent solidification of the surface of the acidic gas adsorption membrane, achieve good purification effect on the acidic gas, and have high removal efficiency.

[0005] In order to achieve these objectives and other advantages according to the present invention, according to one aspect of the present invention, the present invention provides a method for purifying acid gas from waste incineration, comprising the following steps:

[0006] Step 1: Install a deacidification dust collector, wherein a deacidification tank is provided at the bottom of the deacidification dust collector, the deacidification tank is filled with alkali solution, a spray head is provided at the top of the deacidification dust collector, a circulation pipe is connected between the spray head and the deacidification tank, and a multi-layer acid gas adsorption membrane is installed obliquely in the middle of the deacidification dust collector;

[0007] Step 2: The flue gas generated after the garbage incineration is passed into the deacidification tank. The gas escaping after the initial neutralization in the deacidification tank rises under the spraying action of the alkali solution, and the sprayed alkali solution falls into the deacidification tank for recycling;

[0008] Step 3: During the spraying of the alkali solution, the gas passes through multiple layers of acid gas adsorption membranes layer by layer and is finally discharged from the gas outlet of the deacidification dust collector, completing the acid gas purification process.

[0009] Preferably, the acidic gas adsorption membrane is an activated carbon composite membrane modified with an alkaline compound, and the preparation process thereof is as follows:

[0010] Step a, ultrasonically dispersing activated carbon in N,N'-dimethylacetamide solvent, dissolving 4,4'-diaminodiphenyl ether therein, and stirring thoroughly to obtain a mixed solution;

[0011] Step b, slowly adding pyromellitic dianhydride to the mixed solution in batches, and stirring for 5 to 8 hours at 5 to 15° C. to prepare a casting solution, wherein the mass ratio of the activated carbon, 4,4'-diaminodiphenyl ether, and pyromellitic dianhydride is (0.8 to 1):1:(1 to 1.2), and the solid content of the casting solution is 18 to 23%;

[0012] Step c, applying the casting solution to form a film, placing the film in water for solvent exchange, taking it out and placing it in a vacuum drying oven at a heating rate of 8°C / min to 150-200°C, keeping the temperature constant for 2-3 hours, then heating it to 300°C at a heating rate of 4°C / min, keeping the temperature constant for 1-2 hours, and cooling it to room temperature at a rate of 2-5°C / min to obtain an activated carbon composite film;

[0013] Step d: soaking the activated carbon composite membrane in a sodium bicarbonate solution with a concentration of 1 mol / L, heating at 50° C. for 10 to 12 hours, washing, and drying to finally obtain the alkaline compound modified activated carbon composite membrane.

[0014] Preferably, in step b, the mass ratio of activated carbon, 4,4'-diaminodiphenyl ether, and pyromellitic dianhydride is 1:1:1.02.

[0015] Preferably, the solid content of the casting solution in step b is 20%.

[0016] Preferably, a detachable filter screen is provided in the circulation pipe.

[0017] Preferably, the multiple layers of acid gas adsorption membranes are parallel to each other and form an angle of 15° with the horizontal direction.

[0018] Preferably, alkaline agent is regularly added to the deacidification tank to maintain the pH value of the alkaline solution in the deacidification tank above 10.

[0019] The present invention has at least the following beneficial effects: the method for purifying acidic gases from waste incineration of the present invention adopts wet deacidification and dust removal, combined with a multi-layer acidic gas adsorption membrane to absorb and purify the acidic gases in the flue gas, has a good purification effect, reduces the emission of acidic gases in the waste incineration flue gas, avoids its pollution of the atmosphere, and has broad application prospects.

[0020] Other advantages, objectives and features of the present invention will be reflected in part from the following description and will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] FIG1 is a schematic structural diagram of a deacidification dust collector according to a technical solution of the present invention. DETAILED DESCRIPTION

[0022] The present invention will be further described in detail below in conjunction with specific embodiments so that those skilled in the art can implement the invention with reference to the description.

[0023] It should be understood that terms such as “having”, “including” and “comprising” used herein do not preclude the existence or addition of one or more other elements or combinations thereof.

[0024] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "set" should be understood in a broad sense, for example, they can be fixedly connected or set, or detachably connected or set, or integrally connected or set. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. The orientations or positional relationships indicated by the terms "transverse", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0025] The present invention provides a method for purifying acidic gas from garbage incineration, comprising the following steps:

[0026] Step 1: Install a deacidification dust collector 100 (as shown in FIG1 ), wherein a deacidification tank 101 is provided at the bottom of the deacidification dust collector 100 , wherein the deacidification tank 101 is filled with alkali solution, a spray head 102 is provided at the top of the deacidification dust collector 100 , a circulation pipe 103 is connected between the spray head 102 and the deacidification tank 101 , and a multi-layer acid gas adsorption membrane 104 is obliquely installed in the middle of the deacidification dust collector 100 ;

[0027] Step 2: The flue gas generated after the garbage incineration is passed into the deacidification tank 101. The gas escaping after the deacidification tank 101 is initially neutralized and rises under the spraying action of the alkali solution. The sprayed alkali solution falls into the deacidification tank 101 for recycling;

[0028] Step 3: During the spraying of the alkali solution, the gas passes through the multi-layer acid gas adsorption membrane 104 layer by layer and is finally discharged from the gas outlet 105 of the deacidification dust collector 100, completing the acid gas purification process.

[0029] In the above technical solution, a deacidification tank 101 is provided at the lower portion of the deacidification dust collector 100, and a spray head 102 is provided at the upper portion. A multi-layer acid gas adsorption membrane 104 is installed obliquely between the deacidification tank 101 and the spray head 102. A circulation pipe 103 is connected between the spray head 102 and the deacidification tank 101. A water pump is installed on the circulation pipe 103 to pump alkaline solution from the deacidification tank 101 to the spray head 102, where the alkaline solution is sprayed out. During use, the flue gas generated by the incineration of the garbage is directly introduced into the alkaline solution in the deacidification tank 101. After the flue gas and the alkaline solution undergo a preliminary reaction, the remaining gas escapes the deacidification tank 101. The spray head 102 sprays the alkaline solution to perform a secondary deacidification on the rising flue gas. At the same time, the flue gas is purified and adsorbed layer by layer by the multi-layer acid gas adsorption membrane 104. Finally, the remaining purified flue gas is discharged from the outlet 105, completing the deacidification and purification process. In this technical solution, wet deacidification and dust removal are used in combination with a multi-layer acid gas adsorption membrane 104 to absorb and purify the acid gas in the flue gas, with good purification effect. The multi-layer acid gas adsorption membrane 104 is set at an angle, which increases its contact area with the flue gas, prevents the smoke dust from accumulating and solidifying on the membrane surface, and improves the purification effect.

[0030] In another technical solution, the acid gas adsorption membrane 104 is an activated carbon composite membrane modified with an alkaline compound, and its preparation process is as follows:

[0031] Step a, ultrasonically dispersing activated carbon in N,N'-dimethylacetamide solvent, dissolving 4,4'-diaminodiphenyl ether therein, and stirring thoroughly to obtain a mixed solution;

[0032] Step b, slowly adding pyromellitic dianhydride to the mixed solution in batches, and stirring for 5 to 8 hours at 5 to 15° C. to prepare a casting solution, wherein the mass ratio of the activated carbon, 4,4'-diaminodiphenyl ether, and pyromellitic dianhydride is (0.8 to 1):1:(1 to 1.2), and the solid content of the casting solution is 18 to 23%;

[0033] Step c, applying the casting solution to form a film, placing the film in water for solvent exchange, taking it out and placing it in a vacuum drying oven at a heating rate of 8°C / min to 150-200°C, keeping the temperature constant for 2-3 hours, then heating it to 300°C at a heating rate of 4°C / min, keeping the temperature constant for 1-2 hours, and cooling it to room temperature at a rate of 2-5°C / min to obtain an activated carbon composite film;

[0034] Step d: soaking the activated carbon composite membrane in a sodium bicarbonate solution with a concentration of 1 mol / L, heating at 50° C. for 10 to 12 hours, washing, and drying to finally obtain the alkaline compound modified activated carbon composite membrane.

[0035] In another technical solution, in step b, the mass ratio of activated carbon, 4,4'-diaminodiphenyl ether, and pyromellitic dianhydride is 1:1:1.02.

[0036] In another technical solution, the solid content of the casting solution in step b is 20%.

[0037] In another technical solution, a detachable filter 106 is provided in the circulation pipe 103. The filter 106 is provided in this technical solution to filter the impurities and dust in the circulation pipe 103. The filter 106 is detachable to facilitate cleaning of impurities.

[0038] In another technical solution, the multilayer acid gas adsorption membranes 104 are arranged parallel to each other and at a 15° angle to the horizontal. In this technical solution, the multilayer acid gas adsorption membranes 104 are tilted, increasing their contact area with the flue gas. Furthermore, filtered smoke dust rolls down along the membrane's tilt, preventing dust accumulation on the membrane surface.

[0039] In another technical solution, alkaline reagents are regularly added to the deacidification tank 101 to maintain the pH value of the alkaline solution in the deacidification tank 101 above 10. In this technical solution, the alkaline solution in the deacidification tank 101 is recycled and alkaline reagents are regularly added to maintain the pH value of the alkaline solution above 10, thereby ensuring effective neutralization of acidic gases and improving deacidification efficiency.

[0040] Example 1

[0041] A method for purifying acidic gas from garbage incineration comprises the following steps:

[0042] Step 1: Install a deacidification dust collector, wherein a deacidification tank is provided at the bottom of the deacidification dust collector, the deacidification tank is filled with alkali solution, a spray head is provided on the top of the deacidification dust collector, a circulation pipe is connected between the spray head and the deacidification tank, a detachable filter is provided in the circulation pipe, and a multi-layer acid gas adsorption membrane is installed obliquely in the middle of the deacidification dust collector, the multi-layer acid gas adsorption membrane is parallel to each other and forms an angle of 15° with the horizontal direction;

[0043] Step 2: The flue gas generated after the garbage incineration is passed into the deacidification tank. The gas escaping after the initial neutralization in the deacidification tank rises under the action of the spray of alkali solution, and the sprayed alkali solution falls into the deacidification tank for recycling. The alkaline agent is regularly added to the deacidification tank to maintain the pH value of the alkali solution in the deacidification tank above 10;

[0044] Step 3: During the spraying of the alkali solution, the gas passes through multiple layers of acid gas adsorption membranes layer by layer and is finally discharged from the gas outlet of the deacidification dust collector, completing the acid gas purification process.

[0045] Wherein, the acid gas adsorption membrane is a commercially available activated carbon flat membrane.

[0046] Example 2

[0047] A method for purifying acidic gas from waste incineration is different from Example 1 in that:

[0048] The acidic gas adsorption membrane is an activated carbon composite membrane modified with an alkaline compound, and its preparation process is as follows:

[0049] Step a, ultrasonically dispersing activated carbon in N,N'-dimethylacetamide solvent, dissolving 4,4'-diaminodiphenyl ether therein, and stirring thoroughly to obtain a mixed solution;

[0050] Step b, slowly adding pyromellitic dianhydride to the mixed solution in batches, and stirring at 5-15° C. for 5-8 hours to prepare a casting solution, wherein the mass ratio of the activated carbon, 4,4'-diaminodiphenyl ether, and pyromellitic dianhydride is 1:1:1.02, and the solid content of the casting solution is 20%;

[0051] Step c, applying the casting solution to form a film, placing the film in water for solvent exchange, taking it out and placing it in a vacuum drying oven at a heating rate of 8°C / min to 180°C, holding the temperature for 2.5 hours, then heating it to 300°C at a heating rate of 4°C / min, holding the temperature for 1.5 hours, and cooling it to room temperature at a rate of 3°C / min to obtain an activated carbon composite film;

[0052] Step d: soaking the activated carbon composite membrane in a sodium bicarbonate solution with a concentration of 1 mol / L, heating at 50° C. for 10 h, washing, and drying to finally obtain the alkaline compound modified activated carbon composite membrane.

[0053] Example 3

[0054] A method for purifying acidic gas from waste incineration is different from Example 1 in that:

[0055] The acidic gas adsorption membrane is an activated carbon composite membrane modified with an alkaline compound, and its preparation process is as follows:

[0056] Step a, ultrasonically dispersing activated carbon in N,N'-dimethylacetamide solvent, dissolving 4,4'-diaminodiphenyl ether therein, and stirring thoroughly to obtain a mixed solution;

[0057] Step b, slowly adding pyromellitic dianhydride to the mixed solution in batches, and stirring thoroughly at 5-15° C. for 5-8 hours to prepare a casting solution, wherein the mass ratio of the activated carbon, 4,4'-diaminodiphenyl ether, and pyromellitic dianhydride is 0.8:1:1, and the solid content of the casting solution is 18%;

[0058] Step c, applying the casting solution to form a film, placing the film in water for solvent exchange, taking it out and placing it in a vacuum drying oven at a heating rate of 8°C / min to 150°C, holding the temperature for 2 hours, then heating it to 300°C at a heating rate of 4°C / min, holding the temperature for 1 hour, and cooling it to room temperature at a rate of 2°C / min to obtain an activated carbon composite film;

[0059] Step d: soaking the activated carbon composite membrane in a sodium bicarbonate solution with a concentration of 1 mol / L, heating at 50° C. for 10 h, washing, and drying to finally obtain the alkaline compound modified activated carbon composite membrane.

[0060] Example 4

[0061] A method for purifying acidic gas from waste incineration is different from Example 1 in that:

[0062] The acidic gas adsorption membrane is an activated carbon composite membrane modified with an alkaline compound, and its preparation process is as follows:

[0063] Step a, ultrasonically dispersing activated carbon in N,N'-dimethylacetamide solvent, dissolving 4,4'-diaminodiphenyl ether therein, and stirring thoroughly to obtain a mixed solution;

[0064] Step b, slowly adding pyromellitic dianhydride to the mixed solution in batches, and stirring thoroughly at 5-15° C. for 5-8 hours to prepare a casting solution, wherein the mass ratio of the activated carbon, 4,4'-diaminodiphenyl ether, and pyromellitic dianhydride is 1:1:1.2, and the solid content of the casting solution is 23%;

[0065] Step c, applying the casting solution to form a film, placing the film in water for solvent exchange, taking it out and placing it in a vacuum drying oven at a heating rate of 8°C / min to 200°C, holding the temperature for 3 hours, then heating it to 300°C at a heating rate of 4°C / min, holding the temperature for 2 hours, and cooling it to room temperature at a rate of 5°C / min to obtain an activated carbon composite membrane;

[0066] Step d: soaking the activated carbon composite membrane in a sodium bicarbonate solution with a concentration of 1 mol / L, heating at 50° C. for 12 h, washing, and drying to finally obtain the alkaline compound modified activated carbon composite membrane.

[0067] Comparative Example 1

[0068] A method for purifying acidic gas from waste incineration is different from that of Example 1 in that no multi-layer acidic gas adsorption membrane is installed in the deacidification dust collector.

[0069] Comparative Example 2

[0070] A method for purifying and treating acidic gas from waste incineration is different from that of Example 1 in that: multiple layers of acidic gas adsorption membranes are parallel to each other and arranged in a horizontal direction.

[0071] Comparative Example 3

[0072] A method for purifying acidic gas from waste incineration, which differs from Example 2 in that:

[0073] The acid gas adsorption membrane is an activated carbon membrane modified with alkaline compounds, and its preparation process is as follows:

[0074] A commercially available activated carbon flat membrane was immersed in a sodium bicarbonate solution with a concentration of 1 mol / L, heated at 50° C. for 10 h, washed, and dried to obtain the alkaline compound-modified activated carbon membrane.

[0075] Comparative Example 4

[0076] A method for purifying acidic gas from waste incineration, which differs from Example 2 in that:

[0077] The acid gas adsorption membrane is an activated carbon composite membrane, and its preparation process is as follows:

[0078] Step a, ultrasonically dispersing activated carbon in N,N'-dimethylacetamide solvent, dissolving 4,4'-diaminodiphenyl ether therein, and stirring thoroughly to obtain a mixed solution;

[0079] Step b, slowly adding pyromellitic dianhydride to the mixed solution in batches, and stirring at 5-15° C. for 5-8 hours to prepare a casting solution, wherein the mass ratio of the activated carbon, 4,4'-diaminodiphenyl ether, and pyromellitic dianhydride is 1:1:1.02, and the solid content of the casting solution is 20%;

[0080] Step c, coating the casting liquid into a film, placing the film in water for solvent exchange, taking it out and placing it in a vacuum drying oven at a heating rate of 8°C / min to 180°C, keeping the temperature constant for 2.5h, then heating it to 300°C at a heating rate of 4°C / min, keeping the temperature constant for 1.5h, and cooling it to room temperature at a rate of 3°C / min to obtain an activated carbon composite membrane.

[0081] Acid gas removal efficiency comparison test

[0082] The gases discharged from the gas outlets of the deacidification dust collectors in Examples 1 to 4 and Comparative Examples 1 to 4 were collected, and the acid gas content therein was tested. The acid gas content was compared with the acid gas content in the flue gas generated after the waste incineration before entering the deacidification dust collector, and the acid removal rate was calculated. The results are shown in Table 1 below:

[0083] Table 1

[0084] As shown in Table 1, the waste incineration acid gas purification method of Example 2 has the highest acid gas removal rate. This is because the waste incineration acid gas purification method of the present invention utilizes wet deacidification and dust removal, combined with a multi-layer acid gas adsorption membrane to absorb and purify the acid gas in the flue gas, resulting in a good purification effect. The multi-layer acid gas adsorption membrane is arranged at an angle, which increases its contact area with the flue gas. In addition, the acid gas adsorption membrane is obtained by composite activated carbon and polyimide and then modified by soaking in an alkaline compound. The membrane has good alkali resistance, a smooth membrane surface, low friction, and is not prone to accumulation of impurities and dust on the membrane surface, effectively preventing the accumulation and solidification of smoke dust on the membrane surface, thereby improving the purification effect. In Comparative Example 1, no acid gas adsorption membrane was installed, and only wet deacidification and dust removal were used, resulting in poor deacidification effect; the results of Comparative Example 2 were slightly worse than those of Example 1. This was because the multi-layer acid gas adsorption membranes in Comparative Example 2 were all arranged horizontally, and the filtered dust and impurities would accumulate on the membrane surface, thereby forming solidification, affecting the subsequent deacidification effect; in Comparative Example 3, only alkaline compound immersion treatment was used to modify the activated carbon membrane. Although the deacidification effect was better than that of the commercially available activated carbon flat membrane in Example 1, the membrane surface was relatively rough and the friction was large, so dust and impurities were not easy to slide down with the tilt of the membrane. Over time, they were easily solidified on the membrane surface, affecting the deacidification effect; in Comparative Example 4, only polyimide and activated carbon were used to form a composite film, which improved the smoothness of the membrane surface, making it difficult for dust and impurities to adhere to the membrane surface, preventing solidification on the membrane surface, but the alkaline groups on the membrane surface were less than those in Comparative Example 3, resulting in a slightly worse deacidification effect than that of Comparative Example 3.

[0085] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and embodiments shown and described herein.

Claims

1. A method for purifying acidic gas from waste incineration, characterized in that: The following steps are involved: Step 1, installing a deacidification dust collector, wherein a deacidification tank is arranged at the bottom of the deacidification dust collector, the deacidification tank is filled with alkali solution, a spray head is arranged at the top of the deacidification dust collector, a circulation pipeline is connected between the spray head and the deacidification tank, and a multi-layer acid gas adsorption membrane is obliquely installed in the middle of the deacidification dust collector; Step 2: The flue gas generated after the incineration of the garbage is passed into the deacidification tank. The gas that escapes after the initial neutralization in the deacidification tank rises under the spraying action of the alkali solution, and the sprayed alkali solution falls into the deacidification tank for recycling; Step 3: During the spraying of the alkali solution, the gas passes through multiple layers of acid gas adsorption membranes layer by layer and is finally discharged from the gas outlet of the deacidification dust collector, completing the acid gas purification process.

2. The method for purifying acidic gas from waste incineration according to claim 1, characterized in that: The acidic gas adsorption membrane is an activated carbon composite membrane modified by alkaline compounds, and its preparation process is as follows: Step a, taking activated carbon and dispersing it in N,N'-dimethylacetamide solvent by ultrasonication, then dissolving 4,4'-diaminodiphenyl ether therein, stirring and mixing thoroughly to obtain a mixed solution; Step b, slowly adding pyromellitic anhydride to the mixed solution in batches, and fully stirring for 5 to 8 hours at 5 to 15° C. to obtain a casting solution, wherein the mass ratio of the activated carbon, 4,4'-diaminodiphenyl ether, and pyromellitic anhydride is (0.8 to 1):1:(1 to 1.2), and the solid content of the casting solution is 18 to 23%; Step c, applying the casting solution to form a film, placing the film in water for solvent exchange, taking it out and placing it in a vacuum drying oven, heating it to 150-200°C at a heating rate of 8°C / min, keeping the temperature constant for 2-3h, then heating it to 300°C at a heating rate of 4°C / min, keeping the temperature constant for 1-2h, and cooling it to room temperature at a rate of 2-5°C / min to obtain an activated carbon composite film; Step d, immersing the activated carbon composite membrane in a sodium bicarbonate solution with a concentration of 1 mol / L, heating at 50° C. for 10 to 12 hours, washing, and drying to finally obtain the alkaline compound modified activated carbon composite membrane.

3. The method for purifying acidic gas from waste incineration according to claim 2, characterized in that: In the step b, the mass ratio of activated carbon, 4,4'-diaminodiphenyl ether and pyromellitic acid dianhydride is 1:1:1.

02.

4. The method for purifying acidic gas from waste incineration according to claim 2, characterized in that: The solid content of the casting solution in step b is 20%.

5. The method for purifying acidic gas from waste incineration according to claim 1, characterized in that: A detachable filter screen is arranged in the circulation pipeline.

6. The method for purifying acidic gas from waste incineration according to claim 1, characterized in that: The multiple layers of acid gas adsorption membranes are parallel to each other and form an angle of 15° with the horizontal direction.

7. The method for purifying acidic gas from waste incineration according to claim 1, characterized in that: Alkaline agents are regularly added to the deacidification tank to maintain the pH value of the alkaline solution in the deacidification tank above 10.

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