Process and system for combining waste electricity hydrogen production with circulating fluidized bed boiler combustion

A circulating fluidized bed and boiler combustion technology, applied in the direction of combustion air/fuel supply, combustion methods, chemical industry, etc., can solve the problems of large thermal inertia, limit the deep peak-shaving performance of circulating fluidized bed boilers, etc., and achieve improved The effect of fluidizing wind speed, solving fluidization safety problems, and improving response speed

Pending Publication Date: 2021-08-20
TSINGHUA UNIV
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AI-Extracted Technical Summary

Problems solved by technology

Circulating fluidized bed boilers are different from conventional pulverized coal boilers. Since the materials in circulating fluidized bed boilers stay in the furnace for a long time, the combustion inertia in the circulating fluidized bed furnace and the thermal inertia of the bed materials are relatively large, resulting in the circulation flow The fluidized bed boiler generator se...
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Method used

A kind of technology of hydrogen production from waste electricity combined with circulating fluidized bed boiler combustion, as shown in Figure 1, the electrolytic water hydrogen production part can utilize the abandoned electricity that solar photovoltaic or photothermal power generation produces during the day, can utilize power grid at night Hydrogen and oxygen are produced by electrolyzing water with low-cost electricity during electric wave troughs. At the same time, during the deep peak shaving period, the super-generated off-grid electricity of the unit itself is used to electrolyze water to produce hydrogen and oxygen. The hydrogen produced is used in hydrogen fuel cells, hydrogen-cooled generators, and other chemical industries. The oxygen obtained by the electrolysis of water can be mixed with the recirculated flue gas through the secondary air mixer and enter the circulating fluidized bed furnace as the secondary air, forming an oxidizing atmosphere in the upper part of the furnace, thereby improving the efficiency of the circulating fluidized bed during deep peak shaving. The combustion efficiency of the boiler.
A kind of technology of hydrogen production from waste electricity combined with circulating fluidized bed boiler combustion, as shown in Figure 3, electrolyzed water hydrogen production part utilizes the non-on-grid electric quantity that unit itself supersends when the circulating fluidized bed unit reduces load to carry out electrolysis of water Produce hydrogen and oxygen to improve the response speed of the unit to the grid electricity. The obtained hydrogen can be directly added to the flue after the separator of the circulating fluidized bed boiler to use its strong reducing property for denitrification, or it can be reacted with the carbon dioxide captured after the flue gas is recirculated and enriched to form methane or methanol. Methane will be used for flue gas denitrification. The oxygen obtained by the electrolysis of water can be mixed with the recirculated flue gas through the secondary air mixer and enter the circulating fluidized bed furnace as the secondary air, forming an oxidizing atmosphere in the upper part of the furnace, thereby improving the efficiency of the circulating fluidized bed during deep peak shaving. The combustion efficiency of the boiler.
A kind of technology of waste electricity hydrogen production combined with circulating fluidized bed boiler combustion, as shown in Figure 2, electrolytic water hydrogen production part can utilize solar photovoltaic or photothermal power generation to generate abandoned electricity during the day, can utilize power grid at night Hydrogen and oxygen are produced by electrolyzing water with low-cost electricity during electric wave troughs. At the same time, during the deep peak shaving period, the super-generated off-grid electricity of the unit itself is used to electrolyze water to produce hydrogen and oxygen. Part of the produced hydrogen is used for hydrogen fuel cells, hydrogen-cooled generators, and other chemical industries, and the other part is used for flue gas denitrification. The oxygen obtained by the electrolysis of water can be mixed with the recirculated flue gas through the secondary air mixer and enter the circulating fluidized bed furnace as the secondary air, forming an oxidizing atmosphere in the upper part of the furnace, thereby improving the efficiency of the circulating fluidized bed during deep peak shaving. The combustion efficiency of the boiler.
Circulating f...
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Abstract

The invention discloses a process and a system for combining waste electricity hydrogen production with circulating fluidized bed boiler combustion. During deep peak regulation, a part of flue gas is used as circulating flue gas, a part of circulating flue gas is mixed with air or oxygen to obtain primary air, the primary air is used as fluidizing air to enter a hearth from the lower part of the hearth, the other part of circulating flue gas is mixed with oxygen to obtain secondary air, and the secondary air is fed into the hearth from the upper part of the hearth; the oxygen content in the primary air is lower than that in the air, and the oxygen content in the secondary air is higher than that in the air; the oxygen for mixing comes from a water electrolysis hydrogen production process; and in the water electrolysis hydrogen production process, waste electricity is adopted for water electrolysis hydrogen production. By means of the process and system, the problems that in-furnace fluidization safety is poor when the circulating fluidized bed unit is subjected to deep peak regulation, the original generation amount of in-furnace nitric oxide is increased, and the concentration of carbon dioxide in flue gas is low can be effectively solved, and therefore the deep peak regulation capacity of the circulating fluidized bed boiler generator unit is improved.

Application Domain

CellsHydrocarbon from carbon oxides +8

Technology Topic

Nitric oxideCirculating fluidized bed boiler +11

Image

  • Process and system for combining waste electricity hydrogen production with circulating fluidized bed boiler combustion
  • Process and system for combining waste electricity hydrogen production with circulating fluidized bed boiler combustion
  • Process and system for combining waste electricity hydrogen production with circulating fluidized bed boiler combustion

Examples

  • Experimental program(4)

Example Embodiment

[0034] A typical embodiment of the present invention provides a process of waste electric hydrogen binding circulating fluidized bed boiler combustion, including electrolytic water hydrogen production steps and circulating fluidized bed boilers combustion power generation step;
[0035] When the depth peak, a part of the flue gas extracted by the circulating fluidized bed boiler combustion power generation process is used as a circulating flue gas, and a part of the circulating flue gas is mixed with air or oxygen, and the wind is a fluidized wind from the lower part of the furnace. After mixing another part of the cyclic flue gas and oxygen, the secondary wind is sent from the upper part of the furnace into the furnace; the oxygen content in the primary wind is lower than the oxygen content in the air, and the oxygen content in the secondary wind is higher than the air. Oxygen content;
[0036] The oxygen for mixing is from the electrolytic water hydrogen step; the electrolytic water hydrogen step is electrolyte hydrogen hydrogen, the exhaust charge comprises a depth peset amount.
[0037] The present invention adds the oxygen obtained by the electrolytic water to a partially circulated flue gas into the circulating fluidized bed boiler, form an oxidative atmosphere in the upper portion of the furnace, and enhances the cycle of depth peak. The combustion efficiency of the bed boiler. The cyclic fluidized bed boiler oxygen-enriched burn part is mixed by the partial flue gas of the tail flue, the circulating flue gas is mixed with air or electrolytic water to form a low oxygen content (less than 21%). As the fluidized wind enters the furnace, the lower portion of the furnace forms a reducing atmosphere, inhibiting the formation of nitrogen oxides in the furnace. Since the flow rate of the primary wind increases, the fluidization wind speed is improved, and the fluidization of the lower portion of the censored area of ​​the lower portion of the circulation of the cavity of the circulating fluidized bed boiler in the depth peak can be effectively guaranteed. When the carbon dioxide concentration in the circulating flue gas reaches a certain degree, the circular flue gas is carbon capture, and the trapped carbon dioxide is sealed or reused.
[0038] The circulating fluidized bed boiler combustion power generation process is used in the process, and the process is used to combust to the circulating fluidized bed boiler, and the generated steam is used in generator sets; the flue gas generated by the combustion first passes through gas solid separation, and the solid phase is re-entered circulating In the furnace of the fluidized bed boiler, the gas phase is discharged by the chimney after denitration.
[0039] The electrolytic water preferences of the present invention are prepared for preparing hydrogen and oxygen in conventional electrolyte hydrogen production.
[0040] In some embodiments of this embodiment, the waste electricity further includes an inexpensive electricity and / or an inexpensive electric garre when the power supply generated is generated. It is possible to further reduce the cost of electrolytic water hydrogen.
[0041] In some embodiments of this embodiment, partial hydrogen prepared by electrolytic water hydrogen hydrogen unit is used for flue gas denitration treatment. Reduce the cost of the flue gas denitration.
[0042] In some embodiments of this embodiment, a concentrated carbon dioxide in the circulating flue gas is trapped. Can reduce carbon dioxide emissions.
[0043] In one or more embodiments, the captured carbon dioxide is used as a raw material to reactomethane and / or methanol.
[0044] In one or more embodiments, methane is used for flue gas denitration treatment.
[0045] Another embodiment of the present invention provides a system of waste electric hydrogen binding circulating fluidized bed boiler, including electrolytic water hydrogen unit, circulating fluidized bed boiler combustion power generation unit, primary wind mixer and secondary Wind mixer;
[0046] The import of the primary wind mixer is connected to the tail flue. The import of the primary wind mixer also connects the air source and / or oxygen source, and the primary wind mixer exit is connected to the lower part of the lower part of the furnace of the circulating fluidized bed boiler;
[0047] The import of the secondary wind mixer is connected to the tail flue and oxygen source, the secondary wind mixer exit connection circulating fluidized bed boiler in the upper part of the upper portion of the furnace;
[0048] The tail flue is belonging to a circulating fluidized bed boiler combustion power generating unit; the oxygen source belongs to an electrolytic aqueous hydrogen unit; a super-power generation amount when the circulating fluidized bed boiler combustion generating unit depth penders As the electrical energy of the electrolytic water hydrogen unit.
[0049] The circulating fluidized bed boiler combustion power generating unit according to the present invention includes a circulating fluidized bed boiler and a generator set, and the steam generated by circulating fluidized bed boilers is used in generator sets, and the flue gas exit of circulating fluidized bed boiler is connected through the flue connection. The chimney, the flue is sequentially mounted with a high temperature separator, and the denitrifier is sequentially mounted in accordance with the flow of flue gas. The flue between the denitration device and the chimney is the tail flue.
[0050] The electrolytic water hydrogen hydrogen unit according to the present invention includes an electrolytic water hydrogen production device.
[0051] In some embodiments of this embodiment, the inexpensive electricity when the grid is used as the electrolytic water hydrogen unit.
[0052] In some embodiments of this embodiment, there is also included a renewable energy power generating unit, a renewable energy power generating unit generated as an electrolytic water hydrogen cell energy.
[0053] In some embodiments of this embodiment, the hydrogen outlet of the electrolytic water hydrogen hydrogen unit is connected to the reducing gas inlet of the denitration apparatus, which is a circulating fluidized bed boiler combustion power generation unit.
[0054] In some embodiments of this embodiment, an inlet of a carbon capture device and a carbon capture device is connected to the tail. Used to capture carbon dioxide.
[0055] In one or more embodiments, an exit, methane synthesis apparatus and / or methanol synthesis of electrolyte hydrogen hydrogen hydrogen electrolyte hydrogen hydrogen hydrogen hydrogen electrolyte hydrogen hydrogen-hydrogen-hydrogen-hydrogen-hydrogen-based hydrogen-hydrogen-hydrogen-based hydrogen-based hydrogen-based hydrogen-based hydrogen-based hydrogen-based hydrogen-free units include methane synthesis devices and / or methanol synthesis devices, methane synthesis devices and / or methanol synthesis devices. The carbon dioxide inlet of the device is connected to the exit of the carbon capture device.
[0056] In the present invention, the principle of synthesis of methane is a methanation reaction of carbon dioxide, and the main reaction process is carbon dioxide and hydrogen to form methane and water.
[0057] The main reaction process of synthetic methanol in the present invention is carbon dioxide and hydrogen to form methanol and water.
[0058] In one or more embodiments, the methane exit of the methane-based exit is connected to the reducing gas inlet of the denitration apparatus.
[0059] In order to make it possible to understand the technical solution of the present invention more clearly, the technical solutions of the present invention will be described in detail below in conjunction with specific embodiments.

Example Embodiment

[0060] Example 1
[0061] Process for the combustion fluidized bed boiler combined with waste electricity, such as figure 1 As shown, the electrolytic water hydrogen moiety can utilize the abandoned electricity generated by solar photovoltaic or photothermal power during the day, and electrolyte hydrogen and oxygen are electrolyte hydrogen and oxygen at the time of electric wallet when the grid is used in the evening. Electrolyte hydrogen and oxygen were taken by electrolytic water using the non-upper amount of the unit itself. The prepaid hydrogen is used in a hydrogen fuel cell, a hydrogen-free generator, and other chemical industries. The oxygen obtained by electrolytic water can be used as the secondary wind into the circulating fluidized bed after mixing with the secondary wind mixer and the secondary wind, form an oxidative atmosphere at the upper portion of the furnace, thereby increasing the circulating fluidized bed during depth peak. Burning efficiency of the boiler.
[0062] The cyclic fluidized bed boiler oxygen-enriched burn part is recycled by the partial flue gas of the tail flue, and the circulating flue gas is partially mixed by the primary wind mixer and air (a portion of the volume ratio of circulating flue gas and air is 1: 0.3 ~ 0.5. ), Forming a low oxygen content as a fluidized wind to enter the furnace, so that the lower portion of the furnace is lower, inhibiting nitrogen oxides. Since the flow rate of the primary wind is increased, the fluidization wind speed is improved, and the fluidization of the censored material of the lower portion of the lower portion of the lower part of the furnace during depth peak can be effectively guaranteed. Another part of the cyclic flue gas is mixed by the oxygen mixture with the secondary wind mixer and the electrolytic water (the volume ratio of another part of the circulating flue gas and the oxygen is 0.1 to 0.2: 1) forms a secondary wind from the upper portion of the furnace. The oxidative atmosphere of the upper portion of the furnace is achieved, and the first dual-average oxygen content of the furnace is ranging from 21.2 to 27%, up to 4% by the maximum combustion efficiency of the boiler under deep penders low load. When the carbon dioxide concentration in the circulating flue gas reaches 80 to 90% (measured under dry flue gas), the circulating flue gas is carbonized, and the trapped carbon dioxide is sealed or reused.

Example Embodiment

[0063] Example 2
[0064] Process for the combustion fluidized bed boiler combined with waste electricity, such as figure 2 As shown, the electrolytic water hydrogen moiety can utilize the abandoned electricity generated by solar photovoltaic or photothermal power during the day, and electrolyte hydrogen and oxygen are electrolyte hydrogen and oxygen at the time of electric wallet when the grid is used in the evening. Electrolyte hydrogen and oxygen were taken by electrolytic water using the non-upper amount of the unit itself. A part of the hydrogen gas was prepared for a hydrogen fuel cell, a hydrogen-free generator, other chemical industry, and another part for flue gas denitration. The oxygen obtained by electrolytic water can be used as the secondary wind into the circulating fluidized bed after mixing with the secondary wind mixer and the secondary wind, form an oxidative atmosphere at the upper portion of the furnace, thereby increasing the circulating fluidized bed during depth peak. Burning efficiency of the boiler.
[0065] The cyclic fluidized bed boiler oxygen-enriched burn part is recycled by the partial flue gas of the tail flue, and the circulating flue gas is partially mixed by the primary wind mixer and air (a portion of the volume ratio of circulating flue gas and air is 1: 0.3 ~ 0.5. ), Forming a low oxygen content as a fluidized wind to enter the furnace, so that the lower portion of the furnace is lower, inhibiting nitrogen oxides. Since the flow rate of the primary wind is increased, the fluidization wind speed is improved, and the fluidization of the censored material of the lower portion of the lower portion of the lower part of the furnace during depth peak can be effectively guaranteed. Another part of the cyclic flue gas is mixed by the oxygen mixture with the secondary wind mixer and the electrolytic water (the volume ratio of another part of the circulating flue gas and the oxygen is 0.1 to 0.2: 1) forms a secondary wind from the upper portion of the furnace. The oxidative atmosphere of the upper portion of the furnace is achieved, and the first dual-average oxygen content of the furnace is ranging from 21.2 to 27%, up to 4% by the maximum combustion efficiency of the boiler under deep penders low load. When the carbon dioxide concentration in the circulating flue gas reaches 80 to 90% (measured under dry flue gas), the circulating flue gas is carbonized, and the trapped carbon dioxide is sealed or reused.

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