CN215855145U - System for boiler contains sulfur flue gas and flying dust comprehensive utilization - Google Patents
System for boiler contains sulfur flue gas and flying dust comprehensive utilization Download PDFInfo
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- CN215855145U CN215855145U CN202120578207.2U CN202120578207U CN215855145U CN 215855145 U CN215855145 U CN 215855145U CN 202120578207 U CN202120578207 U CN 202120578207U CN 215855145 U CN215855145 U CN 215855145U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
Abstract
A boiler flue outlet is connected to a Bunsen reaction device, the Bunsen reaction device is connected with a water supply device, a reactor exhaust device, an inlet of a sulfuric acid collecting device and a hydrogen iodide decomposing device, the hydrogen iodide decomposing device is connected with an iodine recovery device, a hydrogen collecting device and a fourth inlet of the Bunsen reaction device, the iodine recovery device is connected with an iodine supply device, and an outlet of the iodine recovery device is connected with the Bunsen reaction device; the sulfuric acid collecting device is connected with an aluminum sulfate preparing device, the aluminum sulfate preparing device is connected with an outlet of the boiler fly ash system and an inlet of an aluminum sulfate processing device, and an outlet of the aluminum sulfate processing device is connected with an inlet of an aluminum sulfate storage device and an inlet of a silicon dioxide processing and storage device; based on the system, the sulfuric acid generated in the hydrogen production process is used for absorbing the disulfide trioxide in the fly ash, and simultaneously, the silicon dioxide with higher purity can be generated, so that the aluminum sulfate and the silicon dioxide with higher added values are formed, and the waste substances are recycled.
Description
Technical Field
The utility model relates to the technical field of environmental protection and waste material resource utilization, in particular to a system for comprehensively utilizing sulfur-containing flue gas and fly ash of a boiler.
Background
The main components of the general boiler flue gas are nitrogen, carbon dioxide, sulfur dioxide and water vapor, the sulfur dioxide in the boiler flue gas is one of the main pollution sources of the atmosphere, and the carbon dioxide is a main greenhouse gas. The reduced emissions of these two gases are a major problem facing power production.
At present, most of boiler flue gas desulfurization adopts the method that flue gas is introduced into calcium carbonate solution, calcium carbonate and sulfur dioxide react to generate calcium sulfate and carbon dioxide, and the desulfurization method removes the sulfur dioxide in the boiler flue gas, but increases the emission of greenhouse gas carbon dioxide.
The main components of the common boiler fly ash are silicon dioxide and aluminum oxide, and the existing boiler fly ash is mainly used as a cement additive, even is discarded and buried, and has lower utilization value.
The hydrogen production by adopting the sulfur-iodine cycle high-temperature hydrolysis needs the high temperature above 850 ℃, the sulfuric acid is pyrolyzed into sulfur dioxide, water, sulfur dioxide and iodine, hydrogen iodide is generated at normal temperature, and the hydrogen iodide is decomposed into iodine and hydrogen at the temperature above 300 ℃. The difficulty of the process is that:
(1) the high temperatures of 850 ℃ required for pyrolysis of sulfuric acid are difficult to meet.
(2) Sulfuric acid is a very corrosive substance, and materials that can resist high temperature corrosion are very expensive.
(3) The hydrogen production by pyrolysis of sulfuric acid is less economical.
Disclosure of Invention
Aiming at the problems of high-temperature hydrolysis hydrogen production and sulfur-containing coal combustion at present, the utility model aims to provide a system for comprehensively utilizing sulfur-containing flue gas and fly ash of a boiler, sulfuric acid generated in the hydrogen production process is utilized to absorb disulfide trioxide in the fly ash, silicon dioxide with higher purity is generated at the same time, aluminum sulfate and silicon dioxide with higher added values are formed, and waste substances are recycled.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a system for comprehensively utilizing sulfur-containing flue gas and fly ash of a boiler comprises a boiler flue 1 after denitration and dust removal of the boiler, the outlet of the reactor is connected to the first inlet of the Bunsen reaction device 3, the second inlet of the Bunsen reaction device 3 is connected to the outlet of the water supply device 2, the third outlet of the Bunsen reaction device 3 is connected to the inlet of the reactor exhaust device 6, the first outlet of the Bunsen reaction device 3 is connected to the inlet of the sulfuric acid collection device 4, the second outlet of the Bunsen reaction device 3 is connected to the inlet of the hydrogen iodide decomposition device 5, the first outlet of the hydrogen iodide decomposition device 5 is connected to the first inlet of the iodine recovery device 8, the second outlet of the hydrogen iodide decomposition device 5 is connected to the inlet of the hydrogen collection device 9, the third outlet of the hydrogen iodide decomposition device 5 is connected to the fourth inlet of the Bunsen reaction device 3, the second inlet of the iodine recovery device 8 is connected to the outlet of the iodine supply device 10, and the outlet of the iodine recovery device 8 is connected to the third inlet of the Bunsen reaction device 3;
the outlet of the sulfuric acid collecting device 4 is connected with the first inlet of an aluminum sulfate preparation device 11, the second inlet of the aluminum sulfate preparation device 11 is connected with the outlet of the boiler fly ash system 7, the outlet of the aluminum sulfate preparation device 11 is connected with the inlet of an aluminum sulfate processing device 12, the first outlet of the aluminum sulfate processing device 12 is connected with the inlet of an aluminum sulfate storage device 13, and the second outlet of the aluminum sulfate processing device 12 is connected with the inlet of a silicon dioxide processing and storage device 14.
The Bunsen reaction device 3 is provided with a heating and cooling device, and the internal temperature of the Bunsen reaction device is adjusted between 0 ℃ and 130 ℃; the interior of the container is filled with a solution formed by sulfur dioxide, iodine and water.
The hydrogen iodide decomposition device 5 is internally provided with a heating and cooling device, and the temperature of a medium in the hydrogen iodide decomposition device 5 is between 250 ℃ and 600 ℃.
The reactor exhaust device 6 collects other water-insoluble gases which are removed by the Bunsen reactor 3.
The hydrogen iodide decomposition device 5 is internally provided with a catalyst, hydrogen iodide is partially decomposed into hydrogen and iodine in the device, the hydrogen enters the hydrogen collection device 9, the iodine enters the iodine recovery device 8, and the hydrogen iodide which is not decomposed returns to the Bunsen reaction device 3.
The iodine supplying device 10 is a device for supplementing iodine deficiency at the initial stage of system startup and after iodine deficiency in the system.
The aluminum sulfate preparation device 11 is internally provided with a heating and cooling device, and the temperature of a medium in the aluminum sulfate preparation device 11 is adjusted to be between 80 ℃ and 130 ℃.
The aluminum sulfate treatment device 12 is a filtering and separating device, and through filtering, aluminum sulfate solution is collected and enters an aluminum sulfate storage device 13, and filtered solid impurities are collected and enter a silicon dioxide treatment and storage device 14.
The system for comprehensively utilizing the sulfur-containing flue gas and the fly ash of the boiler, provided by the utility model, at least has the following obvious advantages and technical effects:
(1) sulfur dioxide is obtained without high-temperature pyrolysis of sulfuric acid, so that the difficulty of high-temperature pyrolysis hydrogen production is solved;
(2) the energy consumption in the hydrogen production process is less, the exhaust temperature of the boiler flue gas is suitable for the generation temperature of the hydrogen iodide, no extra measures are needed, and the temperature required by the decomposition of the hydrogen iodide is easily obtained in a power plant (heated by steam);
(3) raw materials required by hydrogen production are derived from polluted waste gas discharged by a boiler, so that the hydrogen production cost is low;
(4) the sulfur dioxide in the flue gas is removed by hydrogen production, the emission of greenhouse gas carbon dioxide is not increased, and the social benefit is good;
(5) and sulfuric acid generated in the hydrogen production process is used for absorbing disulfide trioxide in fly ash, and simultaneously, high-purity silicon dioxide can be generated, so that aluminum sulfate and silicon dioxide with high additional values are formed, and waste substances are recycled.
Drawings
FIG. 1 is a block diagram of a system for comprehensive utilization of sulfur-containing flue gas and fly ash in a boiler according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, a system for the comprehensive utilization of sulfur-containing flue gas and fly ash of a boiler comprises a boiler flue 1 after boiler denitration and dust removal, an outlet of the boiler flue 1 is connected to a first inlet of a Bunsen reaction device 3, a second inlet of the Bunsen reaction device 3 is connected to an outlet of a water supply device 2, a third outlet of the Bunsen reaction device 3 is connected to an inlet of a reactor exhaust device 6, a first outlet of the Bunsen reaction device 3 is connected to an inlet of a sulfuric acid collecting device 4, a second outlet of the Bunsen reaction device 3 is connected to an inlet of a hydrogen iodide decomposing device 5, a first outlet of the hydrogen iodide decomposing device 5 is connected to a first inlet of an iodine recovery device 8, a second outlet of the hydrogen iodide decomposing device 5 is connected to an inlet of a hydrogen collecting device 9, a third outlet of the hydrogen iodide decomposing device 5 is connected to a fourth inlet of the Bunsen reaction device 3, a second inlet of the iodine recovery device 8 is connected to an outlet of an iodine supply device 10, the outlet of the iodine recovery device 8 is connected with the third inlet of the Bunsen reaction device 3;
the outlet of the sulfuric acid collecting device 4 is connected with the first inlet of an aluminum sulfate preparation device 11, the second inlet of the aluminum sulfate preparation device 11 is connected with the outlet of the boiler fly ash system 7, the outlet of the aluminum sulfate preparation device 11 is connected with the inlet of an aluminum sulfate processing device 12, the first outlet of the aluminum sulfate processing device 12 is connected with the inlet of an aluminum sulfate storage device 13, and the second outlet of the aluminum sulfate processing device 12 is connected with the inlet of a silicon dioxide processing and storage device 14.
The Bunsen reaction device 3 is provided with a heating and cooling device, and the internal temperature of the Bunsen reaction device is adjusted between 0 ℃ and 130 ℃; the inside of the device is pre-filled with a solution formed by sulfur dioxide, iodine and water, the sulfur dioxide, the iodine and the water partially react to generate sulfuric acid and hydrogen iodide, the sulfuric acid enters a sulfuric acid collecting device 4, and the hydrogen iodide enters a hydrogen iodide decomposing device 5.
The hydrogen iodide decomposition device 5 is internally provided with a heating and cooling device, and the temperature of a medium in the hydrogen iodide decomposition device 5 can be adjusted to be between 250 ℃ and 600 ℃ through the operation of the heating and cooling device.
The reactor exhaust device 6 collects other water-insoluble gases which are removed by the sulfur dioxide gas through the Bunsen reactor 3, and the main components of the gases are nitrogen, carbon dioxide and oxygen, so that the comprehensive utilization of the gases can be considered separately.
The hydrogen iodide decomposition device 5 is internally provided with a catalyst, hydrogen iodide is partially decomposed into hydrogen and iodine in the device, the hydrogen enters the hydrogen collection device 9, the iodine enters the iodine recovery device 8, and the hydrogen iodide which is not decomposed returns to the Bunsen reaction device 3.
The iodine supplying device 10 is a device for supplementing iodine deficiency at the initial stage of system startup and after iodine deficiency in the system.
The heating and cooling device is arranged in the aluminum sulfate preparation device 11, and the temperature of the medium in the aluminum sulfate preparation device 11 can be adjusted to be between 80 ℃ and 130 ℃ through the operation of the heating and cooling device.
The aluminum sulfate treatment device 12 is a filtering and separating device, and through filtering, aluminum sulfate solution is collected and enters an aluminum sulfate storage device 13, and filtered solid impurities are collected and enter a silicon dioxide treatment and storage device 14.
The working principle of the utility model comprises the following steps:
(1) adding water into a Bunsen reaction device 3 by a water supply device 2;
(2) iodine is previously charged into the Bunsen reaction apparatus 3 from an iodine supplying apparatus 10 through an iodine recovering apparatus 8;
(3) the flue gas coming from the boiler flue 1 and subjected to denitration and dust removal is introduced into a Bunsen reaction device 3, and the components of the flue gas comprise: nitrogen, carbon dioxide, oxygen, sulfur dioxide;
(4) sulfur dioxide, water and iodine are subjected to chemical reaction in the middle of the Bunsen reaction device 3 to generate hydrogen iodide and sulfuric acid, the sulfuric acid enters a sulfuric acid collecting device 4, and the hydrogen iodide enters a hydrogen iodide separator 5;
(5) the hydrogen iodide entering the hydrogen iodide separator 5 is partially decomposed into hydrogen and iodine at the temperature of over 300 ℃ under the action of a catalyst, the iodine enters the iodine recovery device 8, the hydrogen enters the hydrogen collecting device 9, and the undecomposed hydrogen iodide returns to the Bunsen reaction device 3 to participate in the next reaction;
(6) the gas discharged from the Bunsen reaction device 3 enters a reactor exhaust collecting device 6, and the components of the gas comprise nitrogen, carbon dioxide and oxygen;
(7) the fly ash component from the boiler fly ash system 7 comprises silicon dioxide and aluminum oxide, which react with the sulfuric acid from the sulfuric acid collecting device 4 in the aluminum sulfate preparation device 11 to generate aluminum sulfate solution, and the silicon dioxide does not react with the sulfuric acid to form solid impurities;
(8) the mixture discharged from the aluminum sulfate preparation unit 11 is filtered and separated in an aluminum sulfate treatment unit 12, solid impurities formed include silica, and liquid formed includes an aluminum sulfate solution;
(9) the aluminum sulfate solution enters an aluminum sulfate storage device 13, and the silica enters a silica treatment and storage device 14.
Example (b): the volume of the flue gas of a certain 600MW boiler mainly accounts for the ratio: 80.4% of nitrogen, 13.1% of carbon dioxide, 6.3% of oxygen and 0.16% of sulfur dioxide. The boiler fly ash contains 51% of silicon dioxide and 26% of aluminum oxide. The sulfur dioxide in the boiler flue gas is used for producing hydrogen, so that 12 ten thousand cubic meters of hydrogen can be produced, and the value is about 120 ten thousand yuan; 600 tons of aluminum sulfate can be produced, and the value is about 60 ten thousand yuan; can produce more than 800 tons of silicon dioxide with the value of about 400 ten thousand yuan. The economic value is considerable. Meanwhile, the emission of carbon dioxide generated by limestone consumption of a desulfurization system can be reduced by 12 ten thousand cubic meters, and the social benefit is considerable.
Claims (8)
1. A boiler sulfur-containing flue gas and fly ash comprehensive utilization system is characterized by comprising a boiler flue (1) subjected to boiler denitration and dust removal, wherein an outlet of the boiler flue is connected to a first inlet of a Bunsen reaction device (3), a second inlet of the Bunsen reaction device (3) is connected to an outlet of a water supply device (2), a third outlet of the Bunsen reaction device (3) is connected to an inlet of a reactor exhaust device (6), a first outlet of the Bunsen reaction device (3) is connected to an inlet of a sulfuric acid collecting device (4), a second outlet of the Bunsen reaction device (3) is connected to an inlet of a hydrogen iodide decomposing device (5), a first outlet of the hydrogen iodide decomposing device (5) is connected to a first inlet of an iodine recovery device (8), a second outlet of the hydrogen iodide decomposing device (5) is connected to an inlet of a hydrogen collecting device (9), a third outlet of the hydrogen iodide decomposing device (5) is connected to a fourth inlet of the Bunsen reaction device (3), a second inlet of the iodine recovery device (8) is connected with an outlet of the iodine supply device (10), and an outlet of the iodine recovery device (8) is connected with a third inlet of the Bunsen reaction device (3);
the outlet of the sulfuric acid collecting device (4) is connected with the first inlet of the aluminum sulfate preparation device (11), the second inlet of the aluminum sulfate preparation device (11) is connected with the outlet of the boiler fly ash system (7), the outlet of the aluminum sulfate preparation device (11) is connected with the inlet of the aluminum sulfate treatment device (12), the first outlet of the aluminum sulfate treatment device (12) is connected with the inlet of the aluminum sulfate storage device (13), and the second outlet of the aluminum sulfate treatment device (12) is connected with the inlet of the aluminum sulfate storage device (13).
2. The system for the comprehensive utilization of boiler sulfur-containing flue gas and fly ash as claimed in claim 1, wherein said Bunsen reaction device (3) is equipped with heating and cooling device, and its internal temperature is adjusted between 0 ℃ and 130 ℃.
3. The system for the comprehensive utilization of sulfur-containing flue gas and fly ash of a boiler as claimed in claim 1, wherein said hydrogen iodide decomposition device (5) is equipped with a heating and cooling device, and the temperature of the medium in the hydrogen iodide decomposition device (5) is between 250 ℃ and 600 ℃.
4. The system for the comprehensive utilization of the sulfur-containing flue gas and the fly ash of the boiler as claimed in claim 1, wherein the reactor exhaust unit (6) collects the water-insoluble gas from which the sulfur dioxide gas is removed by the Bunsen reactor (3).
5. The system for the comprehensive utilization of the sulfur-containing flue gas and the fly ash of the boiler as claimed in claim 1, wherein the hydrogen iodide decomposition device (5) is filled with a catalyst, hydrogen enters the hydrogen collection device (9), iodine enters the iodine recovery device (8), and the hydrogen iodide which is not decomposed returns to the Bunsen reaction device (3).
6. The system for the comprehensive utilization of sulfur-containing flue gas and fly ash of a boiler as claimed in claim 1, wherein said iodine supplying means (10) is a means for supplementing iodine deficiency during the initial start-up period of the system and after iodine deficiency in the system.
7. The system for the comprehensive utilization of sulfur-containing flue gas and fly ash of a boiler as claimed in claim 1, wherein said aluminum sulfate preparation unit (11) is equipped with heating and cooling devices, and the temperature of the medium in the aluminum sulfate preparation unit (11) is adjusted to 80 ℃ to 130 ℃.
8. The system for the comprehensive utilization of sulfur-containing flue gas and fly ash of boiler as claimed in claim 1, wherein said aluminum sulfate treatment device (12) is a filtration and separation device, and the aluminum sulfate solution is collected into the aluminum sulfate storage device (13) by filtration, and the filtered solid impurities are collected into the silica treatment and storage device (14).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120578207.2U CN215855145U (en) | 2021-03-22 | 2021-03-22 | System for boiler contains sulfur flue gas and flying dust comprehensive utilization |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120578207.2U CN215855145U (en) | 2021-03-22 | 2021-03-22 | System for boiler contains sulfur flue gas and flying dust comprehensive utilization |
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| CN215855145U true CN215855145U (en) | 2022-02-18 |
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