CN216303280U - Nitrogen-insulating combustion and CO for gas boiler2Trapping and utilizing system - Google Patents
Nitrogen-insulating combustion and CO for gas boiler2Trapping and utilizing system Download PDFInfo
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- CN216303280U CN216303280U CN202123019312.1U CN202123019312U CN216303280U CN 216303280 U CN216303280 U CN 216303280U CN 202123019312 U CN202123019312 U CN 202123019312U CN 216303280 U CN216303280 U CN 216303280U
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Abstract
The utility model discloses nitrogen-insulated combustion and CO of a gas boiler2The trapping and utilizing system comprises a natural gas supply device, a water electrolysis hydrogen production device, an oxygen preparation device, a nitrogen compressor, a carbon-based nitrogen-insulating gas mixer, a gas heat exchanger, a gas boiler, a chimney, a flue gas dehydration device, a blower, and CO2Recovery unit and CO2A compressor. The utility model has excellent performance in the aspects of increasing production, saving energy and reducing emission, can reduce the unit consumption of steam and natural gas per ton by more than 10 percent, improve the yield by more than 10 percent, reduce the emission of flue gas and realize NOxAnd (4) ultralow emission.
Description
Technical Field
The utility model relates to the technical field of combustion, in particular to nitrogen-insulated combustion and CO of a gas boiler2A capture and utilization system.
Background
As global warming comes into contact with various aspects such as ecological safety, water resource safety, grain safety and the like, the risk of extreme climate disasters is increased, and the living environment of human beings is seriously threatened. The emission of greenhouse gases is the most important factor causing global warming, wherein CO2The greenhouse effect produced is more than 70% of all greenhouse gases, so CO2The emission reduction is an urgent problem to be solved, and is important for controlling the greenhouse effect and slowing down the global warming.
At present, most of gas boilers adopt air for combustion supporting, only 21% of oxygen in the air participates in combustion, 78% of nitrogen does not participate in combustion, a large amount of nitrogen is heated wastefully and is discharged into the atmosphere at high temperature, so that a large amount of heat loss is caused, and fuel consumption is high; meanwhile, nitrogen also reacts with oxygen at high temperature to generate NOx，NOxThe gas is discharged into the atmosphere to easily form acid rain to cause environmental pollution.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide nitrogen-insulated combustion and CO of a gas boiler2A trapping and utilizing system to solve the deficiencies of the prior art.
The utility model adopts the following technical scheme:
nitrogen insulation combustion and CO (carbon monoxide) of gas boiler2A capture and utilization system comprising:
a natural gas supply device for supplying natural gas;
the water electrolysis hydrogen production device is used for producing hydrogen and oxygen;
the oxygen preparation device is used for preparing oxygen and nitrogen;
the nitrogen compressor is used for pressurizing and conveying the nitrogen prepared by the oxygen preparation device to a downstream nitrogen utilization device;
the carbon-based nitrogen-insulating gas mixer is used for mixing the oxygen prepared by the water electrolysis hydrogen production device, the oxygen prepared by the oxygen preparation device and the circulating flue gas conveyed by the air blower to prepare carbon-based nitrogen-insulating gas;
the gas heat exchanger is used for exchanging heat between the natural gas supplied by the natural gas supply device, the hydrogen prepared by the water electrolysis hydrogen production device, the carbon-based nitrogen-insulating gas provided by the carbon-based nitrogen-insulating gas mixer and the circulating flue gas so as to recover the waste heat of the circulating flue gas to heat the natural gas, the hydrogen and the carbon-based nitrogen-insulating gas;
a gas boiler;
the chimney is used for exhausting the flue gas of the gas-fired boiler under the abnormal working condition or when the flue gas amount is overlarge;
the flue gas dehydration device is used for dehydrating the circulating flue gas after waste heat recovery;
the air blower is used for conveying part of the circulating flue gas subjected to waste heat recovery and dehydration to the carbon-based nitrogen-insulating gas mixer in a pressurized manner;
CO2the recovery device is used for purifying and deoxidizing the circulating flue gas after partial waste heat recovery and dehydration to prepare CO2Producing a product;
CO2compressor for compressing CO2CO obtained by the recovery unit2Product pressurized delivery to downstream CO2A utilization device;
the circulating flue gas outlet of the gas boiler is connected with a gas heat exchanger, the circulating flue gas outlet of the gas heat exchanger is respectively connected with a chimney and a flue gas dehydration device, and the flue gas dehydration device is respectively connected with a blower and CO2Connecting a recovery device; the blower is connected with the carbon-based nitrogen-insulating gas mixer, and a flow regulating valve is arranged on a connecting pipeline of the blower and the carbon-based nitrogen-insulating gas mixer; the oxygen outlet of the water electrolysis hydrogen production device, the oxygen outlet of the oxygen preparation device and the carbon-based nitrogen-insulating gas mixer are connected, and flow regulating valves are arranged on connecting pipelines of the oxygen outlet of the water electrolysis hydrogen production device, the oxygen outlet of the oxygen preparation device and the carbon-based nitrogen-insulating gas mixer; the carbon-based nitrogen-insulating gas mixer is connected with the gas heat exchanger, a flow detector, a temperature detector, a pressure detector, an oxygen purity detector and a flow regulating valve are arranged on a connecting pipeline of the carbon-based nitrogen-insulating gas mixer and the gas heat exchanger, and a carbon-based nitrogen-insulating gas outlet of the gas heat exchanger is connected with the gas boiler; the hydrogen outlet of the water electrolysis hydrogen production device, the natural gas outlet of the natural gas supply device and the gas heat exchanger are connected, and the hydrogen/natural gas outlet of the gas heat exchanger is connected with the gas boiler;
CO2recovery unit CO2Outlet and CO2Compressor connection, CO2Compressor connected to downstream CO2The utilization device is connected with the water outlet of the flue gas dehydration device and the oxygen preparation device; the nitrogen outlet of the oxygen preparation device is connected with a nitrogen compressor, and the nitrogen compressor is connected to a downstream nitrogen utilization device.
Further, the carbon-based nitrogen-insulating gas mixer comprises an outer cylinder, wherein one end of the outer cylinder is provided with an oxygen inlet pipe and a circulating flue gas inlet pipe, and the other end of the outer cylinder is provided with a carbon-based nitrogen-insulating gas outlet pipe; a gas distributor is arranged at the end of the outer cylinder close to the oxygen inlet pipe and the circulating flue gas inlet pipe, the gas distributor is a circular plate, and a plurality of small holes are uniformly formed in the circular plate; a gas collector is arranged at the end of the near-carbon-based nitrogen-insulating gas outlet pipe in the outer barrel, the gas collector is in a hollow circular truncated cone shape, the large circular end of the hollow circular truncated cone shape is a circular plate, a plurality of small holes are uniformly formed in the circular plate, and the small circular end of the hollow circular truncated cone shape is opened and communicated with the carbon-based nitrogen-insulating gas outlet pipe; a plurality of transverse fins and vertical fins are distributed at intervals between the gas distributor and the gas collector in the outer barrel.
Furthermore, the carbon-based nitrogen-insulating gas mixer is made of stainless steel.
Further, the air blower is a variable frequency air blower.
Further, the water electrolysis hydrogen production device and the oxygen production device are connected with an external green electric device.
Further, the nitrogen outlet of the oxygen preparation device is also connected to the inlet of the blower.
Further, the original air combustion fan is connected to the gas heat exchanger.
The utility model has the beneficial effects that:
1. the utility model utilizes rich CO2(more than 95 v% of water is removed) circulating flue gas, oxygen prepared by the oxygen preparation device and oxygen prepared by the water electrolysis hydrogen production device are prepared into carbon-based nitrogen-insulating gas suitable for the oxygen concentration required by the gas boiler and used as combustion-supporting gas of the gas boiler, meanwhile, natural gas and hydrogen prepared by the water electrolysis hydrogen production device are used as fuel gas, and a CO is used in a high-temperature combustion area of the gas boiler2The nitrogen is replaced, the generation of thermal nitrogen oxide in the combustion process is avoided, the ultralow emission of the nitrogen oxide is realized, the radiation intensity in the gas boiler is greatly improved, and the remarkable effects of energy conservation and consumption reduction are achieved; meanwhile, the oxygen content in the carbon-based nitrogen-insulating gas entering the gas boiler can be adjusted according to the change of the raw material and the change of the furnace temperature, the combustion effect is effectively enhanced, the reaction is more complete, the yield is improved, and the energy consumption is reduced. In addition, because the CO of the circulating flue gas is improved2Concentration of (4) (95 v% or more, water removal) of (D), CO2Easier capture, creation of favorable conditions for low cost CCUS (carbon capture, carbon utilization, carbon storage), captured CO2Can be used for oil field exploitation and sealing, steel slag mineralization, concrete mineralization, red mud solidification, chemical industry (mainly including production of methanol, urea, carbonate, carbon monoxide and other products), and food CO2Storage and preservation, etc., realizes CO2Full recovery and CO reduction2The greenhouse effect is reduced. The utility model has excellent performances in the aspects of production increase, energy conservation and emission reduction, and canSo as to reduce the unit consumption of ton of steam and natural gas by more than 10 percent, improve the yield by more than 10 percent, reduce the emission of flue gas and realize NOxAnd (4) ultralow emission.
2. The green electricity generated by renewable energy is used for supplying power to the oxygen preparation device and preparing oxygen and hydrogen by adopting a water electrolysis process, and the oxygen preparation device is used for supporting combustion and burning of a gas boiler.
3. The hydrogen and natural gas prepared by the water electrolysis hydrogen production device are used as fuel gas, the hydrogen is used for combustion in the gas boiler, the moisture generated in the combustion process is increased, and the water resource is saved and the water is more environment-friendly through cooling, condensation and recycling.
4. The carbon-based nitrogen-insulating gas mixer is characterized in that a gas distributor is arranged at one near end part in an outer cylinder, a gas collector is arranged at the other near end part, a plurality of transverse fins and vertical fins are distributed between the gas distributor and the gas collector at intervals, oxygen and circulating flue gas enter the outer cylinder from respective gas inlet pipes, are primarily mixed in front of the gas distributor, then penetrate through small holes uniformly distributed in the gas distributor, then penetrate through the transverse fins and the vertical fins distributed at intervals, are uniformly mixed, and then penetrate through the small holes uniformly distributed in the gas collector and enter a carbon-based nitrogen-insulating gas outlet pipe after being collected. The oxygen and the circulating flue gas are mixed in two steps, firstly, the oxygen and the circulating flue gas are preliminarily mixed before the gas distributor, and then the flowing direction of the oxygen and the circulating flue gas after preliminary mixing is continuously changed in two fins distributed at intervals, so that the oxygen and the circulating flue gas are fully and uniformly mixed, and the mixing effect is enhanced. The small holes uniformly distributed on the gas distributor enable the primarily mixed gas to enter uniformly, bias flow is not easy, and uniform mixing of the second step is facilitated. The gas collector is round platform shape, does benefit to the collection of the gaseous after the misce bene, and gas collector has the horizontal fin of support and vertical fin simultaneously, prevents that the fin from getting into the effect of the adiabatic nitrogen gas outlet duct of carbon back.
5. The utility model utilizes the waste heat of the circulating flue gas to exchange heat with the fuel gas (hydrogen and natural gas) and the combustion-supporting gas (carbon-based nitrogen-insulating gas), can improve the temperature of the fuel gas and the combustion-supporting gas by 30-50 ℃, improves the combustion efficiency and reduces the fuel consumption.
6. The circulating flue gas of the utility model is CO enriched by circulation2The concentration is more than 95 v%, the waste heat of the gas heat exchanger is recovered and then is dehydrated by a flue gas dehydration device, and the CO in the cooled and dehydrated circulating flue gas is reduced2Dew point corrosion of equipment such as pipelines and blowers. When carbon-based nitrogen-insulating gas is added, oxygen without moisture is added in the circulating flue gas, the dew point of the circulating flue gas is reduced, and CO is further reduced2Dew point corrosion of equipment such as pipelines and blowers.
7. The optimization of the combustion environment ensures that the temperature distribution in the gas boiler is more reasonable, and the service life of the gas boiler is effectively prolonged.
8. The nitrogen-insulated combustion of the utility model can not only increase the flame blackness, accelerate the combustion speed, increase the flame temperature, fully burn out unburnt substances carried in the smoke and reduce the smoke blackness. The combustible harmful gas generated by the combustion decomposition and the formation can be fully combusted, and the generation of the harmful gas can be reduced. The exhaust gas temperature and the exhaust gas amount are obviously reduced, and the thermal pollution is reduced.
9. The implementation of nitrogen-insulated combustion of the utility model does not need to change the structure of the gas boiler body, and only partially optimizes and reforms a combustion-supporting system, a combustion system and a circulating flue gas system. Meanwhile, the original air combustion-supporting fan is still kept, and when the oxygen preparation device and the water electrolysis hydrogen production device are in abnormal conditions, the air combustion-supporting can be switched to without disturbance, so that the normal oxygen supply and combustion of the gas-fired boiler are ensured.
10. The nitrogen gas byproduct of the oxygen preparation device can be used for downstream devices, such as oil field auxiliary oil extraction, lithium battery production, chemical industry (mainly including liquid ammonia production, liquefied liquid nitrogen, replacement gas or protective gas and the like) and other fields. Nitrogen may also be provided to replace the purge blower and the front and back lines during shutdown.
Drawings
FIG. 1 is a schematic view of the structure of the present invention.
FIG. 2 is a schematic diagram of a carbon-based nitrogen-insulating gas mixer.
FIG. 3 is a schematic diagram of a gas distributor in a carbon-based nitrogen-insulating gas mixer (a front side, b side).
FIG. 4 is a schematic diagram of a gas collector structure in a carbon-based nitrogen-insulated gas mixer (a front side, b side).
Detailed Description
The utility model is explained in more detail below with reference to exemplary embodiments and the accompanying drawings. The following examples are provided only for illustrating the present invention and are not intended to limit the scope of the present invention.
Nitrogen insulation combustion and CO (carbon monoxide) of gas boiler2The trapping and utilizing system comprises a natural gas supply device 12, a water electrolysis hydrogen production device 1, an oxygen preparation device 2, a nitrogen compressor 10, a carbon-based nitrogen-insulating gas mixer 5, a gas heat exchanger 6, a gas boiler 7, a chimney 11, a flue gas dehydration device 8, a blower 4, CO, as shown in figure 12Recovery unit 3 and CO2A compressor 9.
A natural gas supply 12 for supplying natural gas.
The water electrolysis hydrogen production device 1 is a conventional water electrolysis hydrogen production device 1 in the field, hydrogen and oxygen are prepared by a water electrolysis process, the purity of the hydrogen is more than 99.9 v%, the purity of the oxygen is more than 99.2 v%, and free water is not contained in the oxygen. The water electrolysis hydrogen production device 1 preferably uses green electricity generated by an external green electricity device, wherein the green electricity device generates electricity by using renewable energy sources such as wind power, solar energy, biomass or geothermal energy, and the obtained electricity is green electricity. The hydrogen produced by the water electrolysis hydrogen production device 1 is heated by the gas heat exchanger 6 and then sent to the gas boiler 7 to be used as fuel gas together with natural gas, and the proportion of the hydrogen in the total fuel gas is generally determined according to the green electricity, and is generally 10-20%. The oxygen prepared by the water electrolysis hydrogen production device 1 and the oxygen prepared by the oxygen preparation device 2 are sent into a carbon-based nitrogen-insulating gas mixer 5 as an oxygen source, and the proportion of the oxygen prepared by the water electrolysis hydrogen production device 1 to the total oxygen is generally determined according to the amount of green electricity, and is generally 10-20%.
The oxygen preparation device 2 adopts a cryogenic process to prepare oxygen, firstly compresses and cools air, liquefies the air, makes the air and the liquid contact on a rectifying tower plate by utilizing the difference of the boiling points of oxygen and nitrogen components, carries out mass and heat exchange, continuously condenses the oxygen component with high boiling point into liquid from steam, continuously transfers the nitrogen component with low boiling point into the steam, continuously improves the nitrogen content in the rising steam, and increasingly increases the oxygen content in the downflow liquid, thereby separating the oxygen and the nitrogen to obtain the oxygen with the purity of more than 99.6 v% and the pressure of 0.05-0.2 MPa, having no free water in the oxygen, and simultaneously obtaining the nitrogen with the purity of more than 99.9 v% as a byproduct. The oxygen production plant 2 power also preferably utilizes green electricity produced by an external green electricity plant.
And a nitrogen compressor 10 for pressurizing and delivering the nitrogen gas produced by the oxygen production apparatus 2 to a downstream nitrogen gas utilization apparatus.
And the carbon-based nitrogen-insulating gas mixer 5 is used for mixing the oxygen prepared by the water electrolysis hydrogen production device 1, the oxygen prepared by the oxygen preparation device 2 and the circulating flue gas conveyed by the air blower 4 to prepare the carbon-based nitrogen-insulating gas. As shown in fig. 2 to 4, the carbon-based nitrogen-insulating gas mixer 5 includes an outer cylinder 504, one end of the outer cylinder 504 is provided with an oxygen inlet pipe 501 and a circulating flue gas inlet pipe 502, and the other end is provided with a carbon-based nitrogen-insulating gas outlet pipe 508; the end of the outer cylinder 504 close to the oxygen inlet pipe 501 and the circulating flue gas inlet pipe 502 is provided with a gas distributor 503, the gas distributor 503 is a circular plate, and a plurality of small holes 5031 are uniformly arranged on the circular plate; a gas collector 507 is arranged at the end close to the carbon-based nitrogen-insulating gas outlet pipe 508 in the outer cylinder 504, the gas collector 507 is in a hollow circular truncated cone shape, the large circular end of the hollow circular truncated cone shape is a circular plate, a plurality of small holes 5071 are uniformly formed in the circular plate, and the small circular end of the hollow circular truncated cone shape is opened and communicated with the carbon-based nitrogen-insulating gas outlet pipe 508; a plurality of transverse fins 506 and vertical fins 505 are distributed at intervals between the gas distributor 503 and the gas collector 507 in the outer barrel 504. The carbon-based nitrogen-insulating gas mixer 5 is preferably made of stainless steel. Oxygen enters the outer barrel 504 from the oxygen inlet pipe 501, circulating flue gas enters the outer barrel 504 from the circulating flue gas inlet pipe 502, the oxygen and the circulating flue gas are firstly preliminarily mixed before the gas distributor 503, then pass through the small holes 5031 uniformly distributed on the gas distributor 503, then pass through the transverse fins 506 and the vertical fins 505 which are distributed at intervals, the flow direction of the oxygen and the circulating flue gas is continuously changed in the two kinds of fins 506 and 505 which are distributed at intervals, so that the oxygen and the circulating flue gas are fully and uniformly mixed, then pass through the small holes uniformly distributed on the gas collector 507, are collected, then enter the carbon-based nitrogen-insulating gas outlet pipe 508, and finally are sent out of the carbon-based nitrogen-insulating gas mixer 5.
And the gas heat exchanger 6 is used for exchanging heat between the natural gas supplied by the natural gas supply device 12, the hydrogen prepared by the water electrolysis hydrogen production device 1, the carbon-based nitrogen-insulating gas provided by the carbon-based nitrogen-insulating gas mixer 5 and the circulating flue gas so as to recover the waste heat of the circulating flue gas to heat the natural gas, the hydrogen and the carbon-based nitrogen-insulating gas.
A gas boiler 7.
And the chimney 11 is used for emptying the flue gas of the gas-fired boiler 7 under the abnormal working condition or when the flue gas amount is overlarge.
And the flue gas dehydration device 8 is used for dehydrating the circulating flue gas after waste heat recovery, namely separating saturated water from the circulating flue gas after cooling.
And the blower 4 is used for pressurizing and conveying part of the circulating flue gas subjected to waste heat recovery and dehydration to the carbon-based nitrogen-insulating gas mixer 5. The blower 4 is preferably a variable frequency blower. The outlet of the blower 4 is provided with a safety valve and a back pressure valve, when the outlet pressure is too high, the circulating flue gas can timely return to the inlet of the blower 4, and the adverse effect on the blower 4 caused by the too high outlet pressure of the blower 4 is prevented.
CO2A recovery device 3 for purifying and deoxidizing the circulating flue gas after partial waste heat recovery and dehydration to prepare CO2And (5) producing the product. The method is to deoxidize by using a conventional deoxidizer in the technical field, and can remove trace dust while deoxidizing. Downstream CO2The oxygen content sensitive purification deoxidation of partial fields is utilized, if the oxygen content is not sensitive, the device is not needed, and the oxygen content sensitive purification deoxidation is directly carried out by the following CO2Compressor 9 pressure feed to downstream CO2A device is utilized.
CO2Compressor 9 for compressing CO2CO obtained by the recovery unit 32Product pressurized delivery to downstream CO2A device is utilized.
The circulating flue gas outlet of the gas boiler 7 is connected with a gas heat exchanger 6, and the circulating flue gas outlet of the gas heat exchanger 6 is respectively connected with a chimney 11 and a flue gas dehydration device 8The flue gas dehydration device 8 is respectively connected with the blower 4 and the CO2The recovery device 3 is connected; the blower 4 is connected with the carbon-based nitrogen-insulating gas mixer 5, and a flow regulating valve is arranged on a connecting pipeline of the blower 4 and the carbon-based nitrogen-insulating gas mixer 5; the oxygen outlet of the water electrolysis hydrogen production device 1, the oxygen outlet of the oxygen preparation device 2 and the carbon-based nitrogen-insulating gas mixer 5 are connected, and flow regulating valves are arranged on connecting pipelines of the oxygen outlet of the water electrolysis hydrogen production device 1, the oxygen outlet of the oxygen preparation device 2 and the carbon-based nitrogen-insulating gas mixer 5; the carbon-based nitrogen-insulating gas mixer 5 is connected with the gas heat exchanger 6, a flow detector, a temperature detector, a pressure detector, an oxygen purity detector and a flow regulating valve are arranged on a connecting pipeline of the carbon-based nitrogen-insulating gas mixer 5 and the gas heat exchanger 6, and a carbon-based nitrogen-insulating gas outlet of the gas heat exchanger 6 is connected with the gas boiler 7; the hydrogen outlet of the water electrolysis hydrogen production device 1, the natural gas outlet of the natural gas supply device 12 are connected with the gas heat exchanger 6, and the hydrogen/natural gas outlet of the gas heat exchanger 6 is connected with the gas boiler 7.
CO2Recovery unit 3CO2Outlet and CO2Compressor 9 connected, CO2Compressor 9 is connected to downstream CO2By using the device, the water outlet of the flue gas dehydration device 8 is connected with the oxygen preparation device 2 (not shown in figure 1), and the saturated water separated by the flue gas dehydration device 8 is used as the circulating water of the oxygen preparation device 2. The nitrogen outlet of the oxygen preparation device 2 is respectively connected with the nitrogen compressor 10 and the inlet of the blower 4, the nitrogen compressor 10 is connected to a downstream nitrogen utilization device, the nitrogen outlet of the oxygen preparation device 2 is connected with the inlet of the blower 4, and nitrogen can be provided for replacing the blower 4 and the front pipeline and the rear pipeline during shutdown. An original air combustion-supporting fan (not shown in figure 1) is connected to the gas heat exchanger 6, and the gas quantity is supplemented when the flue gas quantity is insufficient, or under the abnormal condition of carbon-based nitrogen-insulating gas combustion supporting, the original air combustion-supporting fan can be switched to air combustion supporting without disturbance, so that the normal oxygen supply and combustion of the gas-fired boiler 7 are ensured.
Utilize above-mentioned system to carry out gas boiler nitrogen-insulated burning and CO2Trapping and utilizing, comprising the following steps:
1) in the initial stage, the gas boiler 7 utilizes air to support combustion, and after the flue gas is generated, the circulating flue gas and oxygen are utilizedThe carbon-based nitrogen-insulating gas prepared by mixing is used as a combustion improver to gradually replace air to support combustion, and after 5-10 hours of circulation, the carbon-based nitrogen-insulating gas completely replaces air to support combustion, and the carbon-based nitrogen-insulating gas supports combustion and enters a normal operation state; circulating CO in flue gas2The concentration was also gradually enriched to over 95 v% (moisture removal);
2) the circulating flue gas is led into a gas heat exchanger 6 from a gas boiler 7, and exchanges heat with hydrogen and combustion-supporting gas carbon-based nitrogen-insulating gas prepared by the gas natural gas and water electrolysis hydrogen production device 1, so that the waste heat of the circulating flue gas is recovered; the circulating flue gas after waste heat recovery is introduced into a flue gas dehydration device 8 for dehydration, and CO in the circulating flue gas is recycled and enriched through waste heat recovery and dehydration2The concentration is more than 95 v%; the circulating flue gas after waste heat recovery and dehydration is introduced into a blower 4, pressurized by the blower 4 and then introduced into a carbon-based nitrogen-insulating gas mixer 5; introducing oxygen (with the purity of more than 99.6 v%, the pressure of 0.05-0.2 MPa and no free water) prepared by the oxygen preparation device 2 and oxygen (with the purity of more than 99.2 v% and no free water) prepared by the water electrolysis hydrogen production device 1 into a carbon-based nitrogen-insulating gas mixer 5; uniformly mixing the circulating flue gas and oxygen in a carbon-based nitrogen-insulating gas mixer 5 to obtain carbon-based nitrogen-insulating gas, wherein the flow of the circulating flue gas is regulated by an air blower 4 (the air blower is a variable frequency air blower and can regulate the gas flow by the air blower) or a flow regulating valve, the flow of the oxygen is regulated by the flow regulating valve, the concentration of the oxygen in the carbon-based nitrogen-insulating gas is controlled to be 18-35 v%, and the pressure is controlled to be 0.05-0.2 MPa; introducing carbon-based nitrogen-insulating gas into a gas heat exchanger 6, heating by waste heat of circulating flue gas, raising the temperature by 30-50 ℃, and feeding the heated gas into a gas boiler 7 for combustion-supporting gas; introducing natural gas and hydrogen (with the purity of more than 99.9 v%) prepared by the water electrolysis hydrogen production device 1 into a gas heat exchanger 6, heating by waste heat of circulating flue gas, raising the temperature by 30-50 ℃, and sending the heated gas into a gas boiler 7 for gas combustion;
3) CO is introduced into the rest of the circulating flue gas after waste heat recovery and dehydration2The recovery device 3 purifies and deoxidizes to obtain CO2Product of using CO2Compressor 9 compresses CO2Product pressurized delivery to downstream CO2Utilization of plant, downstream CO2The method comprises the steps of oil field exploitation and sealing, steel slag mineralization, concrete mineralization,Solidifying red mud, chemical engineering (mainly including producing methanol, urea, carbonic ester, carbon monoxide and other products), and food CO2Storage and preservation; the nitrogen (with the purity of more than 99.9 v%) prepared by the oxygen preparation device 2 is pressurized and conveyed to a downstream nitrogen utilization device by a nitrogen compressor 10, and the downstream nitrogen utilization device comprises the fields of oil field auxiliary oil recovery, lithium battery production, chemical industry (mainly comprising liquid ammonia production, liquefied liquid nitrogen, replacement gas or protective gas and the like).
Claims (7)
1. Nitrogen insulation combustion and CO (carbon monoxide) of gas boiler2A capture and utilization system, comprising:
a natural gas supply device for supplying natural gas;
the water electrolysis hydrogen production device is used for producing hydrogen and oxygen;
the oxygen preparation device is used for preparing oxygen and nitrogen;
the nitrogen compressor is used for pressurizing and conveying the nitrogen prepared by the oxygen preparation device to a downstream nitrogen utilization device;
the carbon-based nitrogen-insulating gas mixer is used for mixing the oxygen prepared by the water electrolysis hydrogen production device, the oxygen prepared by the oxygen preparation device and the circulating flue gas conveyed by the air blower to prepare carbon-based nitrogen-insulating gas;
the gas heat exchanger is used for exchanging heat between the natural gas supplied by the natural gas supply device, the hydrogen prepared by the water electrolysis hydrogen production device, the carbon-based nitrogen-insulating gas provided by the carbon-based nitrogen-insulating gas mixer and the circulating flue gas so as to recover the waste heat of the circulating flue gas to heat the natural gas, the hydrogen and the carbon-based nitrogen-insulating gas;
a gas boiler;
the chimney is used for exhausting the flue gas of the gas-fired boiler under the abnormal working condition or when the flue gas amount is overlarge;
the flue gas dehydration device is used for dehydrating the circulating flue gas after waste heat recovery;
the air blower is used for conveying part of the circulating flue gas subjected to waste heat recovery and dehydration to the carbon-based nitrogen-insulating gas mixer in a pressurized manner;
CO2a recovery device for recovering part of the waste heat and the dehydrated circulating flue gasDeoxidizing to obtain CO2Producing a product;
CO2compressor for compressing CO2CO obtained by the recovery unit2Product pressurized delivery to downstream CO2A utilization device;
the circulating flue gas outlet of the gas boiler is connected with a gas heat exchanger, the circulating flue gas outlet of the gas heat exchanger is respectively connected with a chimney and a flue gas dehydration device, and the flue gas dehydration device is respectively connected with a blower and CO2Connecting a recovery device; the blower is connected with the carbon-based nitrogen-insulating gas mixer, and a flow regulating valve is arranged on a connecting pipeline of the blower and the carbon-based nitrogen-insulating gas mixer; the oxygen outlet of the water electrolysis hydrogen production device, the oxygen outlet of the oxygen preparation device and the carbon-based nitrogen-insulating gas mixer are connected, and flow regulating valves are arranged on connecting pipelines of the oxygen outlet of the water electrolysis hydrogen production device, the oxygen outlet of the oxygen preparation device and the carbon-based nitrogen-insulating gas mixer; the carbon-based nitrogen-insulating gas mixer is connected with the gas heat exchanger, a flow detector, a temperature detector, a pressure detector, an oxygen purity detector and a flow regulating valve are arranged on a connecting pipeline of the carbon-based nitrogen-insulating gas mixer and the gas heat exchanger, and a carbon-based nitrogen-insulating gas outlet of the gas heat exchanger is connected with the gas boiler; the hydrogen outlet of the water electrolysis hydrogen production device, the natural gas outlet of the natural gas supply device and the gas heat exchanger are connected, and the hydrogen/natural gas outlet of the gas heat exchanger is connected with the gas boiler;
CO2recovery unit CO2Outlet and CO2Compressor connection, CO2Compressor connected to downstream CO2The utilization device is connected with the water outlet of the flue gas dehydration device and the oxygen preparation device; the nitrogen outlet of the oxygen preparation device is connected with a nitrogen compressor, and the nitrogen compressor is connected to a downstream nitrogen utilization device.
2. The gas boiler nitrogen and CO insulating combustion and combustion system as set forth in claim 12The trapping and utilizing system is characterized in that the carbon-based nitrogen-insulating gas mixer comprises an outer cylinder, one end of the outer cylinder is provided with an oxygen inlet pipe and a circulating flue gas inlet pipe, and the other end of the outer cylinder is provided with a carbon-based nitrogen-insulating gas outlet pipe; the near oxygen inlet pipe and the circulating flue gas inlet pipe end in the outer cylinder are provided with gas distributors, and the gas distributorsThe device is a circular plate, and a plurality of small holes are uniformly formed in the circular plate; a gas collector is arranged at the end of the near-carbon-based nitrogen-insulating gas outlet pipe in the outer barrel, the gas collector is in a hollow circular truncated cone shape, the large circular end of the hollow circular truncated cone shape is a circular plate, a plurality of small holes are uniformly formed in the circular plate, and the small circular end of the hollow circular truncated cone shape is opened and communicated with the carbon-based nitrogen-insulating gas outlet pipe; a plurality of transverse fins and vertical fins are distributed at intervals between the gas distributor and the gas collector in the outer barrel.
3. Gas boiler nitrogen and CO insulating combustion and CO according to claim 22The trapping and utilizing system is characterized in that the carbon-based nitrogen-insulating gas mixer is made of stainless steel.
4. The gas boiler nitrogen and CO insulating combustion and combustion system as set forth in claim 12The trapping and utilizing system is characterized in that the blower is a variable frequency blower.
5. The gas boiler nitrogen and CO insulating combustion and combustion system as set forth in claim 12The trapping and utilizing system is characterized in that the water electrolysis hydrogen production device, the oxygen production device and an external green electric device are connected.
6. The gas boiler nitrogen and CO insulating combustion and combustion system as set forth in claim 12The capture and utilization system is characterized in that the nitrogen outlet of the oxygen preparation device is also connected to the inlet of the blower.
7. The gas boiler nitrogen and CO insulating combustion and combustion system as set forth in claim 12The trapping and utilizing system is characterized in that an original air combustion fan is connected to a gas heat exchanger.
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| CN202123019312.1U CN216303280U (en) | 2021-12-03 | 2021-12-03 | Nitrogen-insulating combustion and CO for gas boiler2Trapping and utilizing system |
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| CN202123019312.1U CN216303280U (en) | 2021-12-03 | 2021-12-03 | Nitrogen-insulating combustion and CO for gas boiler2Trapping and utilizing system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114852963A (en) * | 2022-05-31 | 2022-08-05 | 宝武清洁能源有限公司 | Zero-carbon-emission heating system for converting carbon-based fuel into hydrogen fuel |
| WO2023097943A1 (en) * | 2021-12-03 | 2023-06-08 | 上海源晗能源技术有限公司 | Nitrogen-free combustion and carbon dioxide capture and utilization process for gas-fired boiler |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023097943A1 (en) * | 2021-12-03 | 2023-06-08 | 上海源晗能源技术有限公司 | Nitrogen-free combustion and carbon dioxide capture and utilization process for gas-fired boiler |
| CN114852963A (en) * | 2022-05-31 | 2022-08-05 | 宝武清洁能源有限公司 | Zero-carbon-emission heating system for converting carbon-based fuel into hydrogen fuel |
| CN114852963B (en) * | 2022-05-31 | 2024-04-05 | 宝武清洁能源有限公司 | Zero-carbon emission heating system for converting carbon-based fuel into hydrogen fuel |
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