CN214654555U - System for utilize boiler sulfur-containing flue gas system methane - Google Patents
System for utilize boiler sulfur-containing flue gas system methane Download PDFInfo
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- CN214654555U CN214654555U CN202120563669.7U CN202120563669U CN214654555U CN 214654555 U CN214654555 U CN 214654555U CN 202120563669 U CN202120563669 U CN 202120563669U CN 214654555 U CN214654555 U CN 214654555U
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- 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
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Abstract
The utility model discloses a system for preparing methane by utilizing sulfur-containing flue gas of a boiler, which comprises a boiler flue (1), a flue gas spraying and cooling device (2), a primary low-temperature scrubber (3) and a Bunsen reactor (6); the boiler flue (1) is a flue after boiler denitration and dust removal, an outlet of the boiler flue is connected to an inlet of the flue gas spraying and cooling device (2), an outlet of the flue gas spraying and cooling device (2) is connected to an inlet of the first-stage low-temperature scrubber (3), and a first outlet of the first-stage low-temperature scrubber (3) is connected to a first inlet of the Bunsen reactor (6). The utility model does not need to obtain sulfur dioxide by pyrolyzing sulfuric acid at high temperature, thereby solving the difficulty of hydrogen production by pyrolysis at high temperature; the energy consumption in the hydrogen production process is less, the boiler flue gas emission temperature is suitable for the hydrogen iodide production temperature, no extra measures are needed, and the temperature required by hydrogen iodide decomposition is easily obtained in a power plant.
Description
Technical Field
The utility model belongs to the technical field of the environmental protection, concretely relates to system for utilize boiler to contain sulfur flue gas system methane.
Background
Sulfur dioxide in boiler flue gas is one of the main pollution sources of the atmosphere, and carbon dioxide is a main greenhouse gas. The reduced emissions of these two gases are a major problem facing power production.
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, the water, the sulfur dioxide and the iodine generate hydrogen iodide at the 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 temperature of 850 ℃ required for pyrolyzing the sulfuric acid is difficult to meet;
(2) sulfuric acid is a very corrosive substance, and a material capable of resisting high-temperature corrosion is expensive;
(3) the hydrogen production by pyrolysis of sulfuric acid is less economical.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the problems of hydrogen production by high-temperature hydrolysis and sulfur-containing coal combustion at present and provide a system for producing methane by utilizing sulfur-containing flue gas of a boiler.
The utility model discloses a following technical scheme realizes:
a system for preparing methane by using sulfur-containing flue gas of a boiler comprises a boiler flue, a flue gas spraying and cooling device, a primary low-temperature scrubber and a Bunsen reactor; wherein the content of the first and second substances,
the boiler flue is a flue after boiler denitration and dust removal, an outlet of the boiler flue is connected to an inlet of a flue gas spraying cooling device, an outlet of the flue gas spraying cooling device is connected to an inlet of a first-stage low-temperature scrubber, and a first outlet of the first-stage low-temperature scrubber is connected to a first inlet of a Bunsen reactor.
The utility model discloses further improvement lies in, the flue gas sprays the heat sink and sprays for the two-stage, and the one-level sprays the cooling water that adopts boiler unit, with boiler flue gas cooling to normal atmospheric temperature, the second grade sprays and adopts the refrigerated water, with the flue gas cooling to being close the ice point.
The utility model discloses a further improvement lies in, and one-level cryogenic scrubber adopts the freezing point to be less than the liquid below-100 ℃, and sulfur dioxide is insoluble in this liquid.
The utility model discloses further improvement lies in, is equipped with heating and cooling device in this reactor of giving birth to, and through heating and cooling device's work, can adjust the temperature of the medium in the reactor of giving birth to between 5 ℃ to 120 ℃.
The utility model has the further improvement that the device also comprises a liquid separator, a hydrogen iodide treatment device, a sulfuric acid treatment device, a hydrogen iodide decomposer, a hydrogen storage device and a water supply device; wherein the content of the first and second substances,
the outlet of the reactor is connected with the inlet of the liquid separator, the first outlet of the liquid separator is connected with the inlet of the hydrogen iodide treatment device, the outlet of the hydrogen iodide treatment device is connected with the inlet of the hydrogen iodide decomposer, the first outlet of the hydrogen iodide decomposer is connected with the second inlet of the reactor, the second outlet of the hydrogen iodide decomposer is connected with the inlet of the hydrogen storage device, and the outlet of the water supply device is connected with the third inlet of the reactor.
The utility model has the further improvement that the hydrogen iodide decomposer is internally provided with a heating and cooling device, and the temperature of the medium in the hydrogen iodide decomposer can be adjusted between 200 ℃ and 600 ℃ through the work of the heating and cooling device;
the hydrogen iodide decomposer is also internally provided with a catalyst for promoting the decomposition of the hydrogen iodide.
The utility model has the further improvement that the device also comprises a secondary low-temperature scrubber, an exhaust device, a carbon dioxide storage device, a methane production device and a methane storage device; wherein the content of the first and second substances,
the outlet of the first-stage low-temperature scrubber is connected with the inlet of the second-stage low-temperature scrubber, the first outlet of the second-stage low-temperature scrubber is connected with the inlet of the exhaust device, the second outlet of the second-stage low-temperature scrubber is connected with the inlet of the carbon dioxide storage device, the outlet of the carbon dioxide storage device is connected with the first inlet of the methane production device, the outlet of the hydrogen storage device is connected with the second inlet of the methane production device, and the outlet of the methane production device is connected with the inlet of the methane storage device.
The utility model discloses further improvement lies in, and methane production device is the container that can withstand voltage more than 10MPa, is equipped with the catalyst that promotes carbon dioxide and hydrogen synthesis in, is equipped with heating and cooling device, and through heating and cooling device's work, the temperature that can adjust the medium in the methane production device is between 200 ℃ to 600 ℃.
The utility model discloses a further improvement lies in, and second grade cryogenic scrubber adopts the freezing point to be less than the liquid below 120 ℃ below zero, and carbon dioxide is insoluble in this liquid.
The utility model discloses at least, following profitable technological effect has:
the utility model provides a pair of utilize system of boiler sulfur-containing flue gas system methane has following several obvious advantages in the aspect of:
(1) the utility model provides a method for absorbing and utilizing the sulfur dioxide in the waste gas of flue gas, which does not need to obtain sulfur dioxide by pyrolyzing sulfuric acid at high temperature, and solves the difficulty of preparing hydrogen by pyrolyzing at high temperature;
(2) the energy consumption of the sulfur-iodine circular hydrogen production is mainly in the sulfuric acid decomposition link, the process provided by the utility model strides over the sulfuric acid decomposition link with the highest energy consumption, and the energy required by hydrogen production is much less than that of the traditional sulfur-iodine hydrogen production. The boiler flue gas emission temperature is suitable for the hydrogen iodide generation temperature, no extra measures are needed, and the temperature required by hydrogen iodide decomposition is easily obtained in a power plant (heating 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 added value is generated by the comprehensive utilization of the by-product sulfuric acid generated by hydrogen production;
(5) the emission of sulfur dioxide in the flue gas is reduced, and the environmental protection is facilitated;
(6) the carbon dioxide is recycled, and the emission reduction of greenhouse gases is facilitated.
Drawings
FIG. 1 is a block diagram of a system for producing methane by using sulfur-containing flue gas of a boiler.
Description of reference numerals:
1. boiler flue, 2, flue gas spray cooling device, 3, one-level cryogenic scrubber, 4, second grade cryogenic scrubber, 5, exhaust apparatus, 6, Bunsen reactor, 7, liquid separator, 8, hydrogen iodide processing apparatus, 9, sulfuric acid processing apparatus, 10, hydrogen iodide decomposer, 11, hydrogen storage device, 12, water supply installation, 13, carbon dioxide storage device, 14, methane production device, 15, methane storage device.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
As shown in fig. 1, the utility model provides an utilize system of boiler flue gas containing sulphur system methane, spray heat sink 2, one-level cryogenic scrubber 3, second grade cryogenic scrubber 4, exhaust apparatus 5, this biological reactor 6, liquid separator 7, hydrogen iodide processing apparatus 8, sulphuric acid processing apparatus 9, hydrogen iodide decomposer 10, hydrogen storage device 11, water supply installation 12, carbon dioxide storage device 13, methane apparatus for producing 14 and methane storage device 15 including boiler flue 1, flue gas.
The boiler flue 1 is a flue after boiler denitration and dust removal, an outlet of the boiler flue is connected to an inlet of the flue gas spraying cooling device 2, an outlet of the flue gas spraying cooling device 2 is connected to an inlet of the first-stage low-temperature scrubber 3, and a first outlet of the first-stage low-temperature scrubber 3 is connected to a first inlet of the Bunsen reactor 6. The outlet of the Bunsen reactor 6 is connected with the inlet of the liquid separator 7, the first outlet of the liquid separator 7 is connected with the inlet of the hydrogen iodide treatment device 8, the outlet of the hydrogen iodide treatment device 8 is connected with the inlet of the hydrogen iodide decomposer 10, the first outlet of the hydrogen iodide decomposer 10 is connected with the second inlet of the Bunsen reactor 6, the second outlet of the hydrogen iodide decomposer 10 is connected with the inlet of the hydrogen storage device 11, and the outlet of the water supply device 12 is connected with the third inlet of the Bunsen reactor 6. The outlet of the first-stage low-temperature scrubber 3 is connected with the inlet of the second-stage low-temperature scrubber 4, the first outlet of the second-stage low-temperature scrubber 4 is connected with the inlet of the exhaust device 5, the second outlet of the second-stage low-temperature scrubber 4 is connected with the inlet of the carbon dioxide storage device 13, the outlet of the carbon dioxide storage device 13 is connected with the first inlet of the methane production device 14, the outlet of the hydrogen storage device 11 is connected with the second inlet of the methane production device 14, and the outlet of the methane production device 14 is connected with the inlet of the methane storage device 15.
Wherein, the flue gas sprays heat sink 2 and sprays for the two-stage, and the one-level sprays the cooling water that adopts boiler unit, with boiler flue gas cooling to normal atmospheric temperature, and the second grade sprays and adopts the refrigerated water, with the flue gas cooling to being close to freezing point.
The first cryogenic scrubber 3 uses a liquid having a freezing point below-100 c in which the sulphur dioxide is insoluble.
The Bunsen reactor 6 is internally provided with a heating and cooling device, and the temperature of the medium in the Bunsen reactor 6 can be adjusted to be between 5 ℃ and 120 ℃ through the operation of the heating and cooling device.
The hydrogen iodide decomposer 10 is internally provided with a heating and cooling device, and the temperature of a medium in the hydrogen iodide decomposer 10 can be adjusted to be between 200 ℃ and 600 ℃ through the operation of the heating and cooling device; the hydrogen iodide decomposer 10 is also filled with a catalyst for promoting the decomposition of hydrogen iodide.
The methane production apparatus 14 is a container capable of withstanding a pressure of 10MPa or more, and is equipped with a catalyst for promoting the synthesis of carbon dioxide and hydrogen, and with a heating and cooling device, and the temperature of the medium in the methane production apparatus 14 can be adjusted to 200 ℃ to 600 ℃ by the operation of the heating and cooling device.
The secondary cryogenic scrubber 4 employs a liquid having a freezing point below-120 c, in which carbon dioxide is insoluble.
The utility model provides a pair of utilize system of boiler sulfur-containing flue gas system methane, the during operation, include:
water and iodine are filled into the Bunsen reactor 6 in advance according to a set proportion;
the temperature of the flue gas containing sulfur dioxide coming from the boiler flue 1 after denitration and dust removal is close to the freezing point after the flue gas spraying and cooling device 2 is subjected to two-stage cooling;
the temperature of the flue gas from the flue gas spraying and cooling device 2 is reduced to be below 95 ℃ in the primary low-temperature scrubber 3, and the melting point of sulfur dioxide is-72.4 ℃, so that the sulfur dioxide in the flue gas is solidified into solid, and the solid is separated from the primary low-temperature scrubber 3 and enters the Bunsen reactor 6;
adjusting the proportion of sulfur dioxide, water and iodine in the Bunsen reactor 6, and carrying out chemical reaction on the sulfur dioxide, the water and the iodine to generate hydrogen iodide and sulfuric acid;
after sulfur dioxide, water, iodine, hydrogen iodide and sulfuric acid solution discharged from the Bunsen reactor 6 enter a liquid separator 7 and stand still, because of the difference in density, layering occurs, the hydrogen iodide solution formed by the sulfur dioxide, the water, the iodine and the hydrogen iodide is gathered at the lower layer in a large density, and the sulfuric acid solution formed by the sulfuric acid and the water is gathered at the upper layer in a small density;
the lower hydrogen iodide solution enters a hydrogen iodide treatment device 8, and impurities such as sulfuric acid in the solution are removed by means of reverse reaction and the like and enter a hydrogen iodide decomposer 10;
the solution of hydrogen iodide item is heated to 300 ℃ to 500 ℃ in the hydrogen iodide decomposer 10, part of the solution is decomposed to form iodine and hydrogen, the hydrogen enters the hydrogen storage device 11 for storage, and the rest solution returns to the Bunsen reactor 6 to continue to participate in chemical reaction;
cooling the flue gas with the sulfur dioxide removed in the first-stage low-temperature scrubber 3 to below-95 ℃, continuously cooling the flue gas to below-120 ℃ in the second-stage low-temperature scrubber 4, wherein the melting point of carbon dioxide is-78.5 ℃, the carbon dioxide in the flue gas is solidified into solid, the solid is separated from the second-stage low-temperature scrubber 4 and enters a carbon dioxide storage device 13, and the rest gas enters an exhaust device 5;
the carbon dioxide from the carbon dioxide storage device 13 and the hydrogen discharged from the hydrogen storage device 11 enter the methane production device 14 at a set ratio, and react in the methane production device 14 to generate methane, and the generated methane is discharged from the methane production device 14 and then enters the methane storage device 15.
Examples
The volume ratio of the flue gas of a certain 1000MW boiler is as follows: 73.28% of nitrogen, 12.67% of carbon dioxide, 8.37% of water vapor, 5.4% of oxygen and 0.1% of sulfur dioxide. Utilize the utility model provides a technology, unit can follow the flue gas and draw many tons of sulfur dioxide 220 every day at full load operating mode, draw 19000 tons of carbon dioxide, prepare 7 ten thousand m of hydrogen3340 tons of sulfuric acid is prepared. Methanol of 27 tons can be synthesized using the prepared hydrogen and the extracted carbon dioxide.
Claims (9)
1. A system for preparing methane by using sulfur-containing flue gas of a boiler is characterized by comprising a boiler flue (1), a flue gas spraying and cooling device (2), a primary low-temperature scrubber (3) and a Bunsen reactor (6); wherein the content of the first and second substances,
the boiler flue (1) is a flue after boiler denitration and dust removal, an outlet of the boiler flue is connected to an inlet of the flue gas spraying cooling device (2), an outlet of the flue gas spraying cooling device (2) is connected to an inlet of the first-stage low-temperature scrubber (3), and a first outlet of the first-stage low-temperature scrubber (3) is connected to a first inlet of the Bunsen reactor (6).
2. The system for preparing methane by using the sulfur-containing flue gas of the boiler as claimed in claim 1, wherein the flue gas spray cooling device (2) is a two-stage spray, the first stage spray uses cooling water of a boiler unit to cool the flue gas of the boiler to normal temperature, and the second stage spray uses chilled water to cool the flue gas to near freezing point.
3. The system for producing methane by using the sulfur-containing flue gas of the boiler as claimed in claim 1, wherein the primary low-temperature scrubber (3) uses a liquid with a freezing point below-100 ℃, and sulfur dioxide is not dissolved in the liquid.
4. The system for preparing methane by using the sulfur-containing flue gas of the boiler as recited in claim 1, characterized in that the Bunsen reactor (6) is internally provided with a heating and cooling device, and the temperature of the medium in the Bunsen reactor (6) can be adjusted between 5 ℃ and 120 ℃ through the operation of the heating and cooling device.
5. The system for preparing methane by using the sulfur-containing flue gas of the boiler as claimed in claim 1, further comprising a liquid separator (7), a hydrogen iodide treatment device (8), a sulfuric acid treatment device (9), a hydrogen iodide decomposer (10), a hydrogen storage device (11) and a water supply device (12); wherein the content of the first and second substances,
the outlet of the Bunsen reactor (6) is connected with the inlet of the liquid separator (7), the first outlet of the liquid separator (7) is connected with the inlet of the hydrogen iodide treatment device (8), the outlet of the hydrogen iodide treatment device (8) is connected with the inlet of the hydrogen iodide decomposer (10), the first outlet of the hydrogen iodide decomposer (10) is connected with the second inlet of the Bunsen reactor (6), the second outlet of the hydrogen iodide decomposer (10) is connected with the inlet of the hydrogen storage device (11), and the outlet of the water supply device (12) is connected with the third inlet of the Bunsen reactor (6).
6. The system for preparing methane by using the sulfur-containing flue gas of the boiler as claimed in claim 5, wherein the hydrogen iodide decomposer (10) is internally provided with a heating and cooling device, and the temperature of the medium in the hydrogen iodide decomposer (10) can be adjusted to be between 200 ℃ and 600 ℃ through the operation of the heating and cooling device;
the hydrogen iodide decomposer (10) is also filled with a catalyst for promoting the decomposition of the hydrogen iodide.
7. The system for producing methane by using the sulfur-containing flue gas of the boiler as recited in claim 5, further comprising a secondary cryogenic scrubber (4), an exhaust device (5), a carbon dioxide storage device (13), a methane production device (14) and a methane storage device (15); wherein the content of the first and second substances,
the outlet of the first-stage low-temperature scrubber (3) is connected with the inlet of the second-stage low-temperature scrubber (4), the first outlet of the second-stage low-temperature scrubber (4) is connected with the inlet of the exhaust device (5), the second outlet of the second-stage low-temperature scrubber (4) is connected with the inlet of the carbon dioxide storage device (13), the outlet of the carbon dioxide storage device (13) is connected with the first inlet of the methane production device (14), the outlet of the hydrogen storage device (11) is connected with the second inlet of the methane production device (14), and the outlet of the methane production device (14) is connected with the inlet of the methane storage device (15).
8. The system for producing methane by using the sulfur-containing flue gas of the boiler as recited in claim 7, wherein the methane production device (14) is a container capable of withstanding a pressure of 10MPa or more, a catalyst for promoting the synthesis of carbon dioxide and hydrogen is installed in the container, and a heating and cooling device is installed in the container, and the temperature of a medium in the methane production device (14) can be adjusted to be 200 ℃ to 600 ℃ by the operation of the heating and cooling device.
9. The system for producing methane by using the sulfur-containing flue gas of the boiler as claimed in claim 7, wherein the secondary low-temperature scrubber (4) uses a liquid with a freezing point below-120 ℃, and carbon dioxide is not dissolved in the liquid.
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| CN202120563669.7U CN214654555U (en) | 2021-03-18 | 2021-03-18 | System for utilize boiler sulfur-containing flue gas system methane |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115850001A (en) * | 2022-12-08 | 2023-03-28 | 浙江百能科技有限公司 | Method and device for preparing methane by combining carbon dioxide and hydrogen iodide |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115850001A (en) * | 2022-12-08 | 2023-03-28 | 浙江百能科技有限公司 | Method and device for preparing methane by combining carbon dioxide and hydrogen iodide |
| CN115850001B (en) * | 2022-12-08 | 2023-07-25 | 浙江百能科技有限公司 | Method and device for preparing methane by combining carbon dioxide and hydrogen iodide |
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