CN107321154B - Ammonia flue gas desulfurization system and method - Google Patents
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Abstract
The invention relates to an ammonia flue gas desulfurization system and a method, which comprises a desulfurization device (100), a slurry dust removal device (200) and an ammonium sulfate extraction device (300), wherein the desulfurization device (100) and the slurry dust removal device (200) form a dust removal loop through a dust-containing slurry conveying pipeline (11) and a clear liquid backflow pipeline (12), and the desulfurization device (100) and the ammonium sulfate extraction device (300) form an ammonium sulfate extraction loop through an ammonium sulfate slurry conveying pipeline (13) and a mother liquor backflow pipeline (14). The original flue gas is desulfurized by the desulfurizing device to become clean flue gas, one path of the generated dust-containing ammonium sulfate slurry is circularly dedusted by the slurry dedusting device, and the other path of the generated dust-containing ammonium sulfate slurry is dedusted by the ammonium sulfate extracting device to obtain a byproduct ammonium sulfate crystal. Compared with the prior art, the method has the advantages of high desulfurization efficiency, high quality of the byproduct ammonium sulfate, reliable system operation and the like.
Description
Technical Field
The invention belongs to the technical field of chemical industry and environmental protection, and particularly relates to an ammonia flue gas desulfurization system and method.
Background
Acidic gaseous harmful substances contained in flue gases of boilers and iron and steel sintering plants and the like, in particular SO contained therein2Is the main source of acid rain formation. It is known that an effective solution to acid rain pollution is flue gas desulfurization.
The by-product of ammonia desulfurization technique using ammonia as desulfurizing agent is ammonium sulfate fertilizer with high fertilizer efficiency, and can implement SO in flue gas2And recycling the resource. However, the flue gas contains more solid dust besides gaseous pollutants. Further, ammonia desulfurization is wet desulfurization, and the process water used often contains various metal salts such as carbonates or sulfates of calcium, magnesium, iron, and aluminum, and becomes impurity salts in the desulfurization solution, and these salts are also precipitated as solid impurities due to the salt effect caused by the increase in the sulfate group concentration. These solid impurities are usually adsorbed on the crystals of ammonium sulfateThe surface of the nucleus or the small crystal pollutes the surface of the crystal, and blocks new ammonium sulfate solute molecules from being transferred from the solution to the surface of the crystal, thereby preventing the growth and continuous growth of the crystal, generating a large amount of fine crystals, influencing the filtration, even leading the centrifuge to be incapable of filtering, interrupting the production, influencing the quality of ammonium sulfate products, and further influencing the subsequent production operation, including the incapable normal package of a packaging bag.
Patent 200910177141, patent 201210581015 disclose an ammonia desulfurization and dust removal system for high-dust-content flue gas, and the ammonium sulfate solution entering the dust removal system is slurry after ammonium sulfate extraction, which is a post-removal technology. The post-removing technology is to remove residual dust or residue from the filtrate or dilute solution after ammonium sulfate extraction. The problem of this technique is that during the process of ammonium sulfate nucleation and crystal growth, dust or slag can be continuously present and still be adsorbed on the surface of small crystal or fine crystal, thus polluting the crystal surface and blocking new solute molecules from transferring from solution to the crystal surface, thereby preventing the crystal from growing and growing continuously, and being difficult to solve the problem of producing a large amount of fine crystals. On the other hand, because the centrifuge is adopted in the ammonium sulfate extraction process, fine ammonium sulfate crystals can penetrate through the filter screen to enter the mother liquor, and if the slurry for dust removal is extracted from the mother liquor tank and directly enters the filter, more ammonium sulfate crystals are filtered out by the dust remover, so that the filter is easily blocked, and more ammonium sulfate loss is caused. Patent 201120290949 and patent 201210081856 have disclosed the dust pelletizing system of ammonia process desulfurization, for removing dust earlier the ammonium sulfate extraction technique, are mainly suitable for the condition that adopts the mode of evaporative crystallization to extract ammonium sulfate, because after filtering, the solution is the clear solution, does not have crystal ammonium sulfate, only adopts the method of evaporative crystallization to extract ammonium sulfate, and equipment investment is great, and steam and power consumption are higher, and economic nature is relatively poor.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an ammonia flue gas desulfurization system and an ammonia flue gas desulfurization method. Removing SO from raw flue gas in a desulfurizing device2The produced ammonium sulfate slurry is respectively passed through a slurry dust-removing device to remove metal and other impurities, and passed through an ammonium sulfate extraction device to obtain high-quality by-product ammonium sulfate fertilizer,realize SO in flue gas2And recycling the resource.
The purpose of the invention can be realized by the following technical scheme: the utility model provides an ammonia process flue gas desulfurization system, its characterized in that includes desulphurization unit, thick liquid dust collector and thiamine extraction element, desulphurization unit and thick liquid dust collector constitute the dust removal return circuit through dusty thick liquid conveying line and clear liquid return line, desulphurization unit and thiamine extraction element constitute the thiamine through thiamine thick liquid conveying line and mother liquor return line and draw the return circuit.
The slurry dust removal device comprises a settling tank, a filter and a clear liquid tank, wherein the desulfurization device is connected to an inlet of the settling tank through a dust-containing slurry conveying pipeline, the settling tank is provided with a clear liquid outlet positioned on the upper part and a slurry outlet positioned on the lower part or the bottom, the clear liquid outlet is connected with an inlet of the clear liquid tank through a clear liquid settling pipeline, the slurry outlet is connected with an inlet of the filter through a slurry pipeline, the clear liquid outlet of the filter is connected with an inlet of the clear liquid tank through a clear liquid filtering pipeline, an outlet of the clear liquid tank is connected with a clear liquid backflow pipeline and the desulfurization device, a slurry conveying pump is connected to the slurry pipeline, and a clear liquid conveying pump is connected to the clear liquid backflow pipeline.
The settling tank is internally provided with an inclined pipe or an inclined plate, and the filter is internally provided with filter cloth.
And an ammonia supplementing pipeline is connected to the settling tank or the dust-containing slurry conveying pipeline.
And the settling tank or the dust-containing slurry conveying pipeline is connected with a water replenishing pipeline.
And a mud groove is also connected between the settling tank and the mud delivery pump.
The desulfurization device comprises a concentrated crystallization section and a sulfur dioxide absorption oxidation section, wherein the concentrated crystallization section is provided with a concentrated spraying layer and an ammonium sulfate crystallization tank, a concentrated circulating pump is connected between the concentrated crystallization section and the ammonium sulfate crystallization tank, and the sulfur dioxide absorption oxidation section comprises an absorption spraying layer and an oxidation tank, and an absorption circulating pump is connected between the absorption spraying layer and the oxidation tank; the ammonium sulfate extraction device comprises slurry concentration equipment, centrifugal separation equipment, ammonium sulfate drying equipment and ammonium sulfate packaging equipment.
The method for performing flue gas desulfurization by adopting the ammonia flue gas desulfurization system is characterized by comprising the following steps of:
1. flue gas desulfurization: the raw flue gas is sent into the desulfurization device, sequentially passes through a concentration spraying layer and an absorption spraying layer, reacts with added raw material ammonia and process water to obtain ammonium sulfite, reacts with added oxidation air in an oxidation tank to obtain an ammonium sulfate aqueous solution, the ammonium sulfate aqueous solution enters a concentration crystallization section, ammonium sulfate slurry containing ammonium sulfate crystals is obtained in an ammonium sulfate crystallization tank, meanwhile, impurities in the raw flue gas and the process water also exist in the ammonium sulfate slurry, and the slurry density of the oxidation tank is less than 1.20g/cm3And the pH is less than 6.0, and the slurry density of the ammonium sulfate crystallization tank is more than 1.25g/cm3And the pH is less than 5.0, and the raw flue gas is changed into clean flue gas after passing through the desulphurization device;
2. and (3) ammonium sulfate slurry tempering: conveying the dust-containing ammonium sulfate slurry obtained in the step to a slurry dust removal device through the dust-containing slurry pipeline, entering the settling tank, mixing and tempering with ammonia added from the ammonia supplementing pipeline and water added from the water supplementing pipeline, adjusting the pH value and the density, growing fine particles in the slurry, flocculating and agglomerating, and settling to form slurry;
3. settling separation: the mud obtained in the step is positioned at the bottom of the settling tank, or enters the mud tank from a bottom outlet, clear liquid overflows from an upper outlet of the settling tank and enters the clear liquid tank from the clear liquid settling pipeline;
4. and (3) filtering: delivering the slurry discharged from the bottom of the slurry tank or the settling tank to the filter by a slurry delivery pump, filtering to obtain clear liquid and waste residues, wherein the clear liquid enters the clear liquid tank from a clear liquid filtering pipeline and then returns to the desulfurization device by a clear liquid delivery pump;
5. ammonium sulfate extraction: and pumping the ammonium sulfate slurry obtained from the crystallization tank of the desulfurization device to the ammonium sulfate extraction device through an ammonium sulfate slurry conveying pipeline, and sequentially passing through slurry concentration equipment, centrifugal separation equipment, ammonium sulfate drying equipment and ammonium sulfate packaging equipment to obtain crystal ammonium sulfate.
The pH in the step (2) is between 6.0 and 8.0, and the density is between 1.10 and 1.25;
the solid content in the slurry obtained in the step (2) is more than 2.0 percent.
The pH in step (2) is preferably between 6.5 and 7.5, and the density is preferably between 1.15 and 1.20;
the solid content in the slurry obtained in the step (2) is preferably more than 10%.
Compared with the prior art, the invention adopts the dust removal loop and the ammonium sulfate extraction loop to realize synchronous and continuous extraction of metal and other impurities in the ammonium sulfate slurry, so that the metal and other impurities are not accumulated in the slurry, the growth of ammonium sulfate crystals is facilitated, and the product quality and the production efficiency are improved.
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FIG. 1 is a schematic process flow diagram of the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
Example 1
One plant has 2 steam boilers of 260T/hr, and the total emission of flue gas is 66 ten thousand Nm3/hr，SO2The content is 2000mg/Nm3Dust content of 50mg/Nm3And the temperature is 140 ℃, the ammonia flue gas desulfurization system shown in figure 1 is applied, and comprises a desulfurization device 100, a slurry dust removal device 200 and an ammonium sulfate extraction device 300, wherein the desulfurization device 100 and the slurry dust removal device 200 form a dust removal loop through a dust-containing slurry conveying pipeline 11 and a clear liquid return pipeline 12, and the desulfurization device 100 and the ammonium sulfate extraction device 300 form an ammonium sulfate extraction loop through an ammonium sulfate slurry conveying pipeline 13 and a mother liquid return pipeline 14. Wherein, the slurry dust removing device 200 comprises a settling tank 201, a filter 203 and a clear liquid tank 204, the desulfurizing device 100 is connected to the inlet of the settling tank 201 through a dust-containing slurry conveying pipeline 11, the settling tank 201 is provided with a clear liquid outlet positioned at the upper part and a slurry outlet positioned at the bottom part, the clear liquid outlet is connected with the inlet of the clear liquid tank 204 through a settling clear liquid pipeline 21, the slurry outlet is connected with the inlet of the filter 203 through a slurry pipeline 22, the clear liquid outlet of the filter 203 is connected with the inlet of the clear liquid tank 204 through a filtered clear liquid pipeline 24, and the outlet of the clear liquid tank 204 is communicatedThe clear liquid return line 12 is connected to the desulfurization apparatus 100, the slurry line 22 is connected to a slurry feed pump 205, and the clear liquid return line 12 is connected to a clear liquid feed pump 206. The settling tank 201 comprises an inclined tube, and the filter 203 comprises filter cloth. An ammonia supply line 15 and a water supply line 16 are connected to the settling tank 201. A mud pit 202 is also connected between the settling tank 210 and the mud delivery pump.
The desulfurization device 100 comprises a concentrated crystallization section and a sulfur dioxide absorption oxidation section, wherein the concentrated crystallization section is provided with a concentrated spraying layer and an ammonium sulfate crystallization tank, a concentrated circulating pump is connected between the concentrated crystallization section and the ammonium sulfate crystallization tank, and the sulfur dioxide absorption oxidation section comprises an absorption spraying layer and an oxidation tank, and an absorption circulating pump is connected between the sulfur dioxide absorption oxidation section and the oxidation tank; the ammonium sulfate extraction device 300 comprises slurry concentration equipment, centrifugal separation equipment, ammonium sulfate drying equipment and ammonium sulfate packaging equipment.
The ammonia flue gas desulfurization method adopting the device comprises the following steps:
(1) flue gas desulfurization: the raw flue gas is sent into a desulfurization device 100, sequentially passes through a concentration spraying layer and an absorption spraying layer, reacts with added raw material ammonia and process water to obtain ammonium sulfite, reacts with added oxidation air in an oxidation tank to obtain an ammonium sulfate aqueous solution, the ammonium sulfate aqueous solution enters a concentration crystallization section, ammonium sulfate slurry containing ammonium sulfate crystals is obtained in an ammonium sulfate crystallization tank, meanwhile, impurities in the raw flue gas and the process water also exist in the ammonium sulfate slurry to form dust-containing ammonium sulfate slurry, the slurry density of the oxidation tank is less than 1.05, the pH value is 5.3, the slurry density of the ammonium sulfate crystallization tank is more than 1.265, the pH value is less than 4.5, the raw flue gas is ammonium sulfate slurry containing ammonium sulfate crystals, and the raw flue gas is changed into clean flue gas after passing through the desulfurization device 100; dividing the ammonium sulfate slurry into two parts, wherein one part is sent to the slurry dust removal device 200, and the other part is sent to the ammonium sulfate extraction device 300;
(2) and (3) ammonium sulfate slurry tempering: and (2) conveying a part of the ammonium sulfate slurry containing dust and ammonium sulfate crystals obtained in the step (1) to a slurry dust removal device 200 through a dust-containing slurry pipeline 11, entering a settling tank 201, mixing and tempering with ammonia added through an ammonia supplementing pipeline 15 and water added through a water supplementing pipeline 16, adjusting the pH value to 6.5, adjusting the density to 1.15, growing fine particles in the slurry, flocculating and agglomerating, settling to form slurry, wherein the solid content in the slurry is 5%.
(3) Settling separation: the mud obtained in the step (2) is positioned at the bottom of the settling tank 201 and enters the mud tank 202 from a bottom outlet, and clear liquid overflows from an upper outlet of the settling tank 201 and enters a clear liquid tank 204 from a clear liquid settling pipeline 21;
(4) and (3) filtering: from the bottom of the slurry tank 202, the slurry is conveyed to the filter 203 by the slurry conveying pump 205 to obtain clear liquid and waste residue, the clear liquid enters the clear liquid tank 204 by the clear liquid filtering pipeline 24, and then returns to the desulfurization device 100 by the clear liquid conveying pump 206;
(5) ammonium sulfate extraction: and pumping the ammonium sulfate slurry containing the ammonium sulfate crystals from the crystallization tank of the desulfurization device 100 to an ammonium sulfate extraction device 300 through an ammonium sulfate slurry conveying pipeline 13, and sequentially passing through slurry concentration equipment, centrifugal separation equipment, ammonium sulfate drying equipment and ammonium sulfate packaging equipment to obtain the ammonium sulfate crystals.
In this embodiment, the system and method of the present invention are applied to the clean flue gas discharged from the desulfurizer 100, wherein the sulfur dioxide content of the clean flue gas reaches 30mg/Nm30.69 ton of ammonia is consumed per hour, 32 tons of process water is consumed per hour, 2.7 tons of ammonium sulfate is generated as a byproduct per hour, the granularity is between 150 and 400 microns, the dry-based nitrogen content of the ammonium sulfate fertilizer as the byproduct reaches 21 percent, and the free acid content is less than 0.2 percent.
Example 2
The flue gas condition is the same as that of the embodiment, and the flue gas is treated by applying the ammonia flue gas desulfurization system and the ammonia flue gas desulfurization method provided by the invention. In contrast to example 1, in this example, both the ammonia make-up line 15 and the water make-up line 16 are connected to the dusty slurry feed line 11 for the sake of piping arrangement and equipment processing.
Example 3
One power plant has a 600MW coal-fired unit, and the flue gas flow is 200 ten thousand Nm3Hr, flue gas SO2The content is 12000mg/Nm3Dust content of 30mg/Nm3And the temperature is 125 ℃, and the flue gas is treated by applying an ammonia flue gas desulfurization system shown in figure 1. In contrast to example 1, the following steps were carried out:
(1) flue gas desulfurization: the raw flue gas is sent into a desulfurization device 100, sequentially passes through a concentration spraying layer and an absorption spraying layer, reacts with added raw material ammonia and process water to obtain ammonium sulfite, reacts with added oxidation air in an oxidation tank to obtain an ammonium sulfate aqueous solution, the ammonium sulfate aqueous solution enters a concentration crystallization section, ammonium sulfate slurry containing ammonium sulfate crystals is obtained in an ammonium sulfate crystallization tank, meanwhile, impurities in the raw flue gas and the process water also exist in the ammonium sulfate slurry, the slurry density of the oxidation tank is 1.19, the pH value is 5.86, the slurry density of the ammonium sulfate crystallization tank is 1.27, the pH value is 3.8, and the raw flue gas becomes clean flue gas after passing through the desulfurization device 100; dividing the ammonium sulfate slurry into two parts, wherein one part is sent to the slurry dust removal device 200, and the other part is sent to the ammonium sulfate extraction device 300;
(2) and (3) ammonium sulfate slurry tempering: and (2) conveying the dust-containing ammonium sulfate slurry obtained in the step (1) to a slurry dust removal device 200 through a dust-containing slurry pipeline 11, entering a settling tank 201, mixing and tempering with ammonia added through an ammonia supplementing pipeline 15 and water added through a water supplementing pipeline 16, adjusting the pH value to 7.0, adjusting the density to 1.18, growing fine particles in the slurry, flocculating and agglomerating, settling and forming slurry, wherein the solid content in the slurry is 11.2%.
(3) Settling separation: the mud obtained in the step (2) is positioned at the bottom of the settling tank 201 and enters the mud tank 202 from a bottom outlet, and clear liquid overflows from an upper outlet of the settling tank 201 and enters a clear liquid tank 204 from a clear liquid settling pipeline 21;
(4) and (3) filtering: from the bottom of the slurry tank 202, the slurry is conveyed to the filter 203 by the slurry conveying pump 205 to obtain clear liquid and waste residue, the clear liquid enters the clear liquid tank 204 by the clear liquid filtering pipeline 24, and then returns to the desulfurization device 100 by the clear liquid conveying pump 206;
(5) ammonium sulfate extraction: the ammonium sulfate slurry is pumped from the crystallization tank of the desulfurization device 100 to the ammonium sulfate extraction device 300 through the ammonium sulfate slurry conveying pipeline 13, and then passes through slurry concentration equipment, centrifugal separation equipment, ammonium sulfate drying equipment and ammonium sulfate packaging equipment in sequence to obtain crystal ammonium sulfate.
In this embodiment, the system and method of the present invention are applied to the clean flue gas discharged from the desulfurizer 100, wherein the sulfur dioxide content of the clean flue gas reaches 34mg/Nm312.62 tons of ammonia are consumed per hour, 82.2 tons of process water are consumed per hour, and the secondary consumption is one hour49.0 tons of ammonium sulfate is produced, the granularity is between 200 and 500 microns, the dry nitrogen content of the byproduct ammonium sulfate fertilizer reaches 21.12 percent, and the free acid content is 0.1 percent.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (6)
1. The ammonia flue gas desulfurization system is characterized by comprising a desulfurization device (100), a slurry dust removal device (200) and an ammonium sulfate extraction device (300), wherein the desulfurization device (100) and the slurry dust removal device (200) form a dust removal loop through a dust-containing slurry conveying pipeline (11) and a clear liquid backflow pipeline (12), and the desulfurization device (100) and the ammonium sulfate extraction device (300) form an ammonium sulfate extraction loop through an ammonium sulfate slurry conveying pipeline (13) and a mother liquor backflow pipeline (14);
the slurry dust removal device (200) comprises a settling tank (201), a filter (203) and a clear liquid tank (204), the desulfurization device (100) is connected to an inlet of the settling tank (201) through a dust-containing slurry conveying pipeline (11), the settling tank (201) is provided with a clear liquid outlet positioned on the upper part and a slurry outlet positioned on the lower part or the bottom part, the clear liquid outlet is connected with an inlet of the clear liquid tank (204) through a settling clear liquid pipeline (21), the slurry outlet is connected with an inlet of the filter (203) through a slurry pipeline (22), a clear liquid outlet of the filter (203) is connected with an inlet of the clear liquid tank (204) through a filtered clear liquid pipeline (24), an outlet of the clear liquid tank (204) is connected with the desulfurization device (100) through a clear liquid return pipeline (12), and the slurry pipeline (22) is connected with a slurry conveying pump (205), a clear liquid delivery pump (206) is connected to the clear liquid return pipeline (12); an ammonia supplementing pipeline (15) is connected to the settling tank (201) or the dust-containing slurry conveying pipeline (11); and the settling tank (201) or the dust-containing slurry conveying pipeline (11) is connected with a water replenishing pipeline (16).
2. The ammonia flue gas desulfurization system of claim 1, wherein an inclined tube or an inclined plate is arranged in the settling tank (201), and a filter cloth is arranged in the filter (203).
3. The ammonia flue gas desulfurization system of claim 1, wherein a slurry tank (202) is further connected between the settling tank (201) and the slurry delivery pump (205).
4. The ammonia flue gas desulfurization system of claim 1, wherein the desulfurization device (100) comprises a concentration crystallization section and a sulfur dioxide absorption oxidation section, the concentration crystallization section comprises a concentration spray layer and an ammonium sulfate crystallization tank, a concentration circulating pump is connected between the concentration crystallization section and the ammonium sulfate crystallization tank, the sulfur dioxide absorption oxidation section comprises an absorption spray layer and an oxidation tank, and an absorption circulating pump is connected between the absorption spray layer and the oxidation tank; the ammonium sulfate extraction device (300) comprises slurry concentration equipment, centrifugal separation equipment, ammonium sulfate drying equipment and ammonium sulfate packaging equipment.
5. A method for performing flue gas desulfurization by using the ammonia flue gas desulfurization system of any one of claims 1 to 4, comprising the steps of:
(1) flue gas desulfurization: the raw flue gas is sent into the desulfurization device (100), sequentially passes through the concentration spraying layer and the absorption spraying layer, reacts with the added raw material ammonia and the process water to obtain ammonium sulfite, reacts with the added oxidation air in the oxidation pond to obtain an ammonium sulfate aqueous solution, the ammonium sulfate aqueous solution enters the concentration crystallization section, ammonium sulfate slurry containing ammonium sulfate crystals is obtained in an ammonium sulfate crystallization pond, meanwhile, impurities in the raw flue gas and the process water also exist in the ammonium sulfate slurry, and the slurry density of the oxidation pond is less than 1.20g/cm3And the pH is less than 6.0, and the slurry density of the ammonium sulfate crystallization tank is more than 1.25g/cm3And the pH value is less than 5.0, and the raw flue gas is changed into clean flue gas after passing through the desulphurization device (100);
(2) and (3) ammonium sulfate slurry tempering: conveying the dust-containing ammonium sulfate slurry obtained in the step (1) to a slurry dust removal device (200) through a dust-containing slurry pipeline (11), entering a settling tank (201), mixing and tempering with ammonia added through an ammonia supplementing pipeline (15) and water added through a water supplementing pipeline (16), adjusting the pH value and the density, growing fine particles in the slurry, flocculating and agglomerating, and settling to form slurry;
(3) settling separation: the mud obtained in the step (2) is positioned at the bottom of the settling tank (201) or enters the mud tank (202) from a bottom outlet, clear liquid overflows from an upper outlet of the settling tank (201) and enters the clear liquid tank (204) from the settling clear liquid pipeline (21);
(4) and (3) filtering: the mud discharged from the bottom of the mud tank (202) or the settling tank (201) is conveyed to the filter (203) by a mud conveying pump (205) and filtered to obtain clear liquid and waste residue, wherein the clear liquid enters the clear liquid tank (204) by a clear liquid filtering pipeline (24) and then returns to the desulfurization device (100) by a clear liquid conveying pump (206);
(5) ammonium sulfate extraction: pumping ammonium sulfate slurry obtained from a crystallization tank of a desulfurization device (100) to an ammonium sulfate extraction device (300) through an ammonium sulfate slurry conveying pipeline (13), and sequentially passing through slurry concentration equipment, centrifugal separation equipment, ammonium sulfate drying equipment and ammonium sulfate packaging equipment to obtain crystal ammonium sulfate;
the pH in the step (2) is between 6.0 and 8.0, and the density is between 1.10 and 1.25;
the solid content in the slurry obtained in the step (2) is more than 2.0 percent.
6. The method for flue gas desulfurization according to claim 5, wherein the pH in step (2) is between 6.5 and 7.5, and the density is between 1.15 and 1.20;
the solid content in the slurry obtained in the step (2) is more than 10 percent.
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| CN110115903A (en) * | 2019-06-12 | 2019-08-13 | 广西奥士达环境工程有限公司 | A kind of blending industrial refuse fires the flue gas processing method of building porcelain granule |
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| US6287873B2 (en) * | 1996-05-20 | 2001-09-11 | Arctech Inc. | Microbiological desulfurization of sulfur containing gases |
| JP5335740B2 (en) * | 2010-08-03 | 2013-11-06 | 株式会社日立製作所 | Exhaust gas treatment method and equipment |
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