CN210595292U - Ammonia recovery and fuel cell power generation system applied to sewage treatment plant - Google Patents
Ammonia recovery and fuel cell power generation system applied to sewage treatment plant Download PDFInfo
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- CN210595292U CN210595292U CN201921509246.6U CN201921509246U CN210595292U CN 210595292 U CN210595292 U CN 210595292U CN 201921509246 U CN201921509246 U CN 201921509246U CN 210595292 U CN210595292 U CN 210595292U
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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
- Y02E60/50—Fuel cells
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
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Abstract
The utility model discloses a be applied to sewage treatment plant's recovery ammonia and fuel cell power generation system, belong to environmental protection and energy saving equipment field, this system comprises fuel cell system and recovery ammonia system, including the marsh gas pre-heater, first heat exchanger, the strip tower, the absorption tower, second heat exchanger, the flash column, air heater, third heat exchanger, high temperature fuel cell, fire burning furnace, DC/AC converting unit, adopt and retrieve ammonia and fuel cell power generation system, it always can make the ammonia decompose into nitrogen gas and hydrogen under high temperature to retrieve the ammonia system, provide fuel source for fuel cell, can realize sewage treatment plant's marsh gas and the low emission of carbon, slow down climatic change, provide sufficient electric power resource for sewage treatment full-flow facility, the comprehensive utilization of the energy has been realized, environmental protection and energy-conserving dual benefit have been realized.
Description
Technical Field
The utility model relates to a melting carbonate fuel cell's new forms of energy application, in particular to are applied to sewage treatment plant's recovery ammonia and fuel cell power generation system belongs to environmental protection and energy saving equipment field.
Background
The high-temperature fuel cell (molten carbonate fuel cell and solid oxide fuel cell) is used as a clean and efficient power generation device, has wide fuel source, can form a circulating power generation system with steam turbine equipment and the like, and has better application prospect.
On the other hand, the biogas power generation technology is a new energy comprehensive utilization technology integrating environmental protection and energy conservation, biogas converted from sludge of a sewage treatment plant through anaerobic digestion is subjected to cogeneration through an internal combustion engine, but the generated renewable electricity cannot meet all requirements of treatment facilities, in the biochemical treatment process of a sewage treatment station, usually, the treatment method of NH4 is to add alkaline solution (quicklime, sodium hydroxide, potassium hydroxide and the like) to neutralize and generate NH3, and NH3 is separated in modes of aeration and the like, so that water eutrophication is caused when the content of NH4+ is too high, the treatment of biochemical bacteria is not facilitated, and COD of industrial sewage exceeds the standard.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a be applied to sewage treatment plant's recovery ammonia and fuel cell power generation system to the renewable electricity that solves the marsh gas burning production can not satisfy treatment facility's demand problem, further improves the resource of renewable electricity and the wholeness ability of retrieving the ammonia system.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a power generation system for recovering ammonia and a fuel cell applied to a sewage treatment plant comprises: the system comprises a biogas preheater, a first heat exchanger, a stripping tower, an absorption tower, a second heat exchanger, a flash tower, an air preheater, a third heat exchanger, a high-temperature fuel cell and a combustion furnace;
a top gas outlet of the stripping tower is connected with the absorption tower, a bottom outlet of the absorption tower is connected with a first heat exchange channel inlet of the second heat exchanger, a first heat exchange channel outlet of the second heat exchanger is connected with the flash tower, and an outlet of the flash tower is connected with a first inlet of the mixer;
the biogas preheater is connected with the second inlet of the mixer; the outlet of the mixer is connected with the inlet of a first heat exchange channel of the first heat exchanger, the outlet of the first heat exchange channel of the first heat exchanger is connected with the gas inlet of the anode of the high-temperature fuel cell, and the gas outlet of the anode of the high-temperature fuel cell is connected with a combustion furnace;
the air preheater is connected with the inlet of a first heat exchange channel of the third heat exchanger, the outlet of the first heat exchange channel of the third heat exchanger is connected with the gas inlet of the cathode of the high-temperature fuel cell, and the gas outlet of the cathode of the high-temperature fuel cell is connected with the combustion furnace.
Preferably, the combustion furnace is connected to a second heat exchange passage inlet of the third heat exchanger, a second heat exchange passage outlet of the third heat exchanger is connected to a second heat exchange passage inlet of the second heat exchanger, and a second heat exchange passage outlet of the second heat exchanger is discharged to the outside.
Preferably, the combustion furnace is connected with the inlet of the second heat exchange channel of the first heat exchanger, and the outlet of the second heat exchange channel of the first heat exchanger is connected with the stripping tower.
Preferably, the fuel cell further comprises a DC/AC conversion unit, and the high-temperature fuel cell is connected to the DC/AC conversion unit.
Preferably, the high-temperature fuel cell is a solid oxide fuel cell.
Preferably, the high-temperature fuel cell is a molten carbonate fuel cell.
Compared with the prior art, the utility model discloses following beneficial effect has:
the ammonia recovery system can separate ammonia from biogas residues and biogas slurry of a sewage treatment plant through steam stripping, absorption and flash evaporation processes, decompose the collected methane and the ammonia separated from the biogas residues and biogas slurry through the steam stripping, absorption and flash evaporation processes into nitrogen and hydrogen at high temperature, serve as a fuel source of the fuel cell, can realize low emission of ammonia and carbon of the sewage treatment plant, slow down climate change, provide sufficient power resources for treatment equipment of the whole sewage treatment process, and have the dual effects of reducing environmental pollution and saving energy.
Drawings
The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of a power generation system for ammonia recovery and fuel cells applied to a sewage treatment plant according to the present invention;
in the figure, 1 is a stripping tower, 2 is an absorption tower, 3 is a second heat exchanger, 4 is a flash tower, 5 is a third heat exchanger, 6 is an air preheater, 7 is a combustion furnace, 8 is a DC/AC conversion unit, 9 is a high temperature fuel cell, 10 is a first heat exchanger, 11 is a biogas preheater, and 12 is a mixer.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
As shown in the attached figure 1 of the drawings,
the utility model relates to a recovery ammonia and fuel cell power generation system for sewage treatment plant, including stripping tower 1, absorption tower 2, second heat exchanger 3, flash column 4, third heat exchanger 5, air heater 6, fire burning furnace 7, DC/AC conversion unit 8, high temperature fuel cell 9, first heat exchanger 10, marsh gas preheater 11 and blender 12;
a top gas outlet of the stripping tower 1 is connected with an inlet of the absorption tower 2, a bottom outlet of the absorption tower 2 is connected with a first heat exchange channel inlet of the second heat exchanger 3, a first heat exchange channel outlet of the second heat exchanger 3 is connected with an inlet of the flash tower 4, and an outlet of the flash tower 4 is connected with a first inlet of the mixer 12;
the biogas preheater 11 is connected with a second inlet of the mixer 12; the outlet of the mixer 12 is connected with the inlet of the first heat exchange channel of the first heat exchanger 10, the outlet of the first heat exchange channel of the first heat exchanger 10 is connected with the gas inlet of the anode of the high-temperature fuel cell 9, and the gas outlet of the anode of the high-temperature fuel cell 9 is connected with the combustion furnace 7;
the air preheater 6 is connected with the inlet of the first heat exchange channel of the third heat exchanger 5, the outlet of the first heat exchange channel of the third heat exchanger 5 is connected with the gas inlet of the cathode of the high-temperature fuel cell 9, and the gas outlet of the cathode of the high-temperature fuel cell 9 is connected with the combustion furnace 7;
the smoke discharged from the combustion furnace 7 is divided into two paths;
one path of the heat exchange tubes is connected with an inlet of a second heat exchange channel of the third heat exchanger 5, an outlet of the second heat exchange channel of the third heat exchanger 5 is connected with an inlet of a second heat exchange channel of the second heat exchanger 3, and an outlet of the second heat exchange channel of the second heat exchanger 3 is discharged to the air;
the other path is connected with the inlet of a second heat exchange channel of the first heat exchanger 10, and the outlet of the second heat exchange channel of the first heat exchanger 10 is connected with the stripping tower 1;
the high-temperature fuel cell 9 is connected to the DC/AC conversion unit 8.
The utility model relates to a be applied to sewage treatment plant's recovery ammonia and fuel cell power generation method, include:
biogas (main component CH) collected by sewage treatment plant4) The biogas slurry and the biogas residue enter the anode of a high-temperature fuel cell 9 after heat exchange through a biogas preheater 11 and a first heat exchanger 10 in sequence, and the other path of biogas slurry and the biogas residue are separated and recovered ammonia (component NH) through the steam stripping of a stripping tower 1, the absorption of an absorption tower 2 and the flash evaporation process of a flash evaporation tower 43And H2Mixture of O) into the first heat exchanger 10, the biogas and recovered ammonia are mixed in the mixer 12 and then heated to 800-:
the reacted gas enters the anode of the fuel cell to participate in the anode reaction.
The air enters an air preheater and a third heat exchanger and is heated to 800-900 ℃, and then enters a cathode unit of the fuel cell, and oxygen in the air participates in the cathode reaction of the fuel cell at the cathode of the fuel cell.
The current generated by the fuel cell is transmitted to the sewage treatment equipment through the DC-AC inverter to be used as a power supply.
The residual gas which does not completely participate in the reaction in the anode and the cathode of the fuel cell is combusted through a combustion furnace 7, part of the combusted high-temperature flue gas returns to a first heat exchanger to heat a mixture of methane and ammonia, the low-temperature flue gas after heating the methane and the ammonia enters the bottom of a stripping tower to be used as a heat source for stripping methane liquid and methane residue, and the heat exchange is carried out between the bottom of the stripping tower and the methane liquid and the methane residue entering the stripping tower;
and the other part of the high-temperature flue gas after combustion returns to the third heat exchanger to heat the air preheated by the air preheater, and the low-temperature flue gas after air heating enters the second heat exchanger to be used as a heat source for recovering ammonia after absorption by the absorption tower, and is directly emptied after cooling.
And the gas product stripped by the stripping tower enters an absorption tower, is cooled at the bottom of the absorption tower and then is absorbed by counter-current water to form a mixture containing ammonia of water, enters a second heat exchanger for heating and then enters a flash tower, and is flashed according to a set evaporation proportion in the flash tower, wherein the evaporation proportion is matched with the proportion of methane, so that the fuel ratio of an anode air inlet of the fuel cell is met, and the optimal carbon-hydrogen ratio of the gas is realized in the reforming process.
The high-temperature fuel cell can be a solid oxide fuel cell or a molten carbonate fuel cell.
The utility model discloses in, retrieve ammonia and fuel cell power generation system's combination, can reduce the carbon emission in the marsh gas fuel that wastewater treatment plant produced, realize energy saving and emission reduction, high temperature environment among the fuel cell helps decomposing into hydrogen and nitrogen gas of ammonia, can realize that fuel cell fuel source is methane and ammonia, provides sufficient power resource for sewage treatment full-flow.
The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, to thereby enable others skilled in the art to best understand the invention for and utilize the invention. The present invention is limited only by the claims and their full scope and equivalents.
Claims (6)
1. Be applied to recovery ammonia and fuel cell power generation system of sewage treatment plant, its characterized in that includes: the system comprises a methane preheater (11), a first heat exchanger (10), a stripping tower (1), an absorption tower (2), a second heat exchanger (3), a flash tower (4), an air preheater (6), a third heat exchanger (5), a high-temperature fuel cell (9) and a combustion furnace (7);
the top gas outlet of the stripping tower (1) is connected with the absorption tower (2), the bottom outlet of the absorption tower (2) is connected with the inlet of the first heat exchange channel of the second heat exchanger (3), the outlet of the first heat exchange channel of the second heat exchanger is connected with the flash tower (4), and the outlet of the flash tower (4) is connected with the first inlet of the mixer;
the biogas preheater (11) is connected with the second inlet of the mixer; the outlet of the mixer is connected with the inlet of a first heat exchange channel of the first heat exchanger (10), the outlet of the first heat exchange channel of the first heat exchanger is connected with the gas inlet of the anode of the high-temperature fuel cell (9), and the gas outlet of the anode of the high-temperature fuel cell (9) is connected with the combustion furnace (7);
the air preheater (6) is connected with the inlet of a first heat exchange channel of the third heat exchanger (5), the outlet of the first heat exchange channel of the third heat exchanger (5) is connected with the gas inlet of the cathode of the high-temperature fuel cell (9), and the gas outlet of the cathode of the high-temperature fuel cell (9) is connected with the combustion furnace (7).
2. The system for recycling ammonia and fuel cell power generation applied to sewage treatment plant according to claim 1, wherein the combustion furnace is connected with the second heat exchange channel inlet of the third heat exchanger (5), the second heat exchange channel outlet of the third heat exchanger (5) is connected with the second heat exchange channel inlet of the second heat exchanger (3), and the second heat exchange channel outlet of the second heat exchanger (3) is discharged to the outside.
3. The system for recycling ammonia and fuel cell power generation applied to sewage treatment plant according to claim 1, wherein the combustion furnace is connected to the inlet of the second heat exchange path of the first heat exchanger (10), and the outlet of the second heat exchange path of the first heat exchanger (10) is connected to the stripping tower (1).
4. The system for recycling ammonia and generating a fuel cell applied to a sewage treatment plant according to claim 1, further comprising a DC/AC conversion unit, wherein the high temperature fuel cell is connected to the DC/AC conversion unit.
5. The system for recycling ammonia and generating a fuel cell applied to a sewage treatment plant according to claim 1, wherein the high temperature fuel cell employs a solid oxide fuel cell.
6. The system for recycling ammonia and fuel cell power generation applied to sewage treatment plant according to claim 1, wherein the high temperature fuel cell employs a molten carbonate fuel cell.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921509246.6U CN210595292U (en) | 2019-09-10 | 2019-09-10 | Ammonia recovery and fuel cell power generation system applied to sewage treatment plant |
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| CN201921509246.6U CN210595292U (en) | 2019-09-10 | 2019-09-10 | Ammonia recovery and fuel cell power generation system applied to sewage treatment plant |
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| CN210595292U true CN210595292U (en) | 2020-05-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110482570A (en) * | 2019-09-10 | 2019-11-22 | 中国华能集团清洁能源技术研究院有限公司 | Recycling ammonia and fuel cell generation and method applied to sewage treatment plant |
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2019
- 2019-09-10 CN CN201921509246.6U patent/CN210595292U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110482570A (en) * | 2019-09-10 | 2019-11-22 | 中国华能集团清洁能源技术研究院有限公司 | Recycling ammonia and fuel cell generation and method applied to sewage treatment plant |
| CN110482570B (en) * | 2019-09-10 | 2024-03-01 | 中国华能集团清洁能源技术研究院有限公司 | Recovered ammonia and fuel cell power generation system and method applied to sewage treatment plant |
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