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System for simultaneously removing carbon dioxide and nitric oxide and method thereof

A carbon dioxide and nitrogen oxide technology, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve the problems of high catalyst cost, deactivation, and easy poisoning.

Pending Publication Date: 2020-10-20
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The denitrification efficiency of SCR technology can reach more than 90%, but its catalysts, such as vanadium and titanium, are expensive and easy to be poisoned and deactivated

Method used

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  • System for simultaneously removing carbon dioxide and nitric oxide and method thereof
  • System for simultaneously removing carbon dioxide and nitric oxide and method thereof
  • System for simultaneously removing carbon dioxide and nitric oxide and method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Such as figure 1 As shown, the system mainly includes the following equipment: coal-fired boiler 1, circulating fluidized bed decarburization and denitrification furnace 2, circulating fluidized bed calciner 3, and bubbling fluidized bed pyrolysis carbon deposition furnace 4. Calcium carbonate A first enters the circulating fluidized bed calciner 3 for calcination, and the generated high-temperature calcium oxide B is sent to the bubbling fluidized bed pyrolysis carbon deposition furnace 4 to provide heat for pyrolysis, and at the same time, biomass C enters the drum In the bubble fluidized bed pyrolysis carbon deposition furnace 2, it is pyrolyzed under the fluidization of a small amount of nitrogen D to generate carbon deposition calcium oxide / biomass char mixture E and pyrolysis gas F, and the pyrolysis gas F is sent to the calciner 3 The mixture E is fed into the circulating fluidized bed decarburization and denitrification furnace 2, and reacts with the carbon diox...

Embodiment 2

[0070] On the bubbling fluidized bed reactor mentioned in embodiment 1, adopt the calcium oxide and biomass identical with embodiment 1, have prepared carbon deposit calcium oxide, carry out TEM analysis to carbon deposit calcium oxide as follows image 3 shown. The preparation conditions of carbonized calcium oxide are: pyrolysis temperature 800°C, pyrolysis time 10min, mass ratio of pine wood / calcium oxide 20:100, fluidization number 2, pyrolysis atmosphere 100% nitrogen. Such as image 3 As shown in (a) and (b), after co-pyrolysis of calcium oxide and pine wood, carbon deposits are formed on the pores and surfaces of calcium oxide, and the calcium oxide grains are wrapped by a layer of amorphous carbon with a low degree of graphitization. Closely combined with carbon deposits. After further enlarging the carbon-deposited calcium oxide as image 3 As shown in (c), carbon-deposited calcium oxide is mainly composed of crystals and non-crystals. The interplanar spacing of cr...

Embodiment 3

[0072] On the bubbling fluidized bed reactor mentioned in Example 1, the same calcium oxide and biomass as in Example 1 were used to study the effect of the mass ratio of biomass / calcium oxide on the simultaneous removal performance. The decarburization and denitrification reaction conditions are as follows: the mass of calcium oxide is 16g, the pyrolysis temperature of pine wood is 800°C, the pyrolysis time is 10min, the pyrolysis atmosphere is 100% nitrogen, and the removal reaction temperature is 650°C, and the fluidization number is 2. The inlet atmosphere is 15% carbon dioxide / 4% oxygen / 500×10 -4 % Nitric Oxide / Nitrogen Balance. Change the mass ratio of pine wood / calcium oxide, and use German Testo350 flue gas analyzer to test the nitric oxide and carbon dioxide in the outlet gas of the fluidized bed reactor. The results are as follows: Figure 4(a) and (b) shown. The denitrification performance of carbon-deposited calcium oxide increases with the increase of the mass r...

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Abstract

The invention discloses a system for simultaneously removing carbon dioxide and nitrogen oxide and a method. The system comprises a decarburization and denitrification furnace, a calcining furnace anda pyrolysis carbon deposition furnace; a gas inlet of the decarburization and denitrification furnace is connected with a flue gas exhaust port of a coal-fired boiler; the calcining furnace is provided with a calcium carbonate supply port, and a calcium oxide discharge port of the calcining furnace is connected with the pyrolysis carbon deposition furnace; and the pyrolysis carbon deposition furnace is provided with a biomass supply port, and a solid discharge port of the pyrolysis carbon deposition furnace is connected with the decarburization and denitrification furnace. In the system for circularly capturing CO2 by calcium, a pyrolysis carbon deposition furnace is added between the calcining furnace and a carbonating furnace, biomass is pyrolyzed by using high-temperature calcium oxideflowing between the carbonating furnace and the calcining furnace as a heat source, and carbon deposition calcium oxide / biomass coke is generated in the biomass pyrolysis process. In the decarburization and denitrification furnace, calcium oxide serves as a denitrification catalyst and a carbon dioxide absorbent, deposited carbon and biomass coke serve as denitrification reducing agents, and efficient removal of carbon dioxide and nitric oxide can be achieved at the same time.

Description

technical field [0001] The invention belongs to the technical field of environmental pollutant prevention and clean combustion, and specifically relates to a system and method for simultaneously removing carbon dioxide and nitrogen oxides, which use carbon-deposited calcium oxide / biomass coke to simultaneously remove carbon dioxide and nitrogen oxides. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Coal-fired power plants have always been the main source of man-made carbon dioxide emissions, and reducing carbon dioxide emissions from coal-fired power plants is an important task for energy conservation and emission reduction. Calcium cycling technology is currently one of...

Claims

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Application Information

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IPC IPC(8): B01D53/81B01D53/62B01D53/56
CPCB01D53/565B01D53/62B01D53/81B01D2253/1124B01D2255/2045B01D2257/504Y02A50/20Y02C20/40
Inventor 李英杰张婉钱钰其韩奎华赵建立牛胜利齐建荟
Owner SHANDONG UNIV
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