Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Carbide slag composite calcium-based desulfurizer based on biomass conditioning and preparation method thereof

A composite calcium-based, calcium carbide slag technology, applied in separation methods, chemical instruments and methods, and separation of dispersed particles, can solve the problems of industrialization difficulties, high costs, and high processing costs, and achieve improved diffusion capabilities, low production costs, and preparation short process effect

Active Publication Date: 2021-03-26
SHANXI UNIV
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN104190243A discloses a method for desulfurization of calcium carbide slag in coal-fired boilers. In this patent, calcium carbide slag is directly used for desulfurization in the furnace after physical drying to solve the problem that the water content of wet calcium carbide slag after pressure filtration is as high as 40%-50% %, the difficulty of directly entering the furnace; patent CN107213779A discloses a production system and production process of calcium carbide slag desulfurizer, which uses calcium carbide slag as a desulfurizer in the furnace after drying, crushing and separation, but the dried carbide slag Slag, due to the fine particle size, there are still some defects in the utilization of CFB boilers, such as unreasonable adjustment of air volume, which will cause calcium carbide slag to be blown out of the furnace before reaching the maximum conversion rate, thereby reducing the utilization rate of desulfurization agent
At home and abroad, calcium-based desulfurizers have also been chemically modified, mainly by adding some ions to increase the concentration of CaO in CaSO 4 Diffusion ability of dense product layer, patent CN105944552A discloses a calcium-based desulfurizer modified by barium ion doping, by adding BaCl 2 The prepared calcium-based desulfurizer has a large number of vacant site defects and is compatible with SO 2 The product layer formed after the reaction has a strong solid-state ion diffusion ability; patent CN103566719A discloses a method for producing TiCl 4 The generated chlorinated waste molten salt is crushed, dissolved in water, filtered, and step-by-step to remove impurities to obtain CaCO 3 Desulfurization agent, and modify it with NaCl aqueous solution. In the prior art, the modification of calcium-based desulfurizer by pure chemical reagents has the problems of high cost and difficulty in industrialization. Modification is carried out by waste source modifier, and the operation process involves chemical separation. Complicated procedures such as high processing costs

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Carbide slag composite calcium-based desulfurizer based on biomass conditioning and preparation method thereof
  • Carbide slag composite calcium-based desulfurizer based on biomass conditioning and preparation method thereof
  • Carbide slag composite calcium-based desulfurizer based on biomass conditioning and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030]Composite desulfurizer ratio: electric gravel 70g, wheat straw 30g.

[0031]Method for preparing biomass-containing mesenchymal gravel composite calcium-based desulfurizers, including the following steps:

[0032]S1, the straw crushing with a raw material having a length of about 2 cm, mixing 30 g of wheat straw and 70 g of wet electric gravel, stirring rapidly for 30 min;

[0033]S2, combined S1 straw - electric gravel mixture in 20oC is placed for 6 days to adjust;

[0034]S3, the straw-iron stove mixture in S2 is naturally air-dried to water into 8% to prepare straw-electric gravel solids;

[0035]S4, a straw-tone solid of S3 is granulated under 8 mPa pressure, and a composite calcium-based deanger having a particle size of 2 cm is obtained.

[0036]Place 10 prepared composite calcium-based desulfurizers in 850oIn the tube furnace of C, enter the simulated flue gas, and the smoke CO2, O2SO2The volume fraction is 15%, 3%, 0.3%, respectively, with N2In order to balance the gas, after 8 min, th...

Embodiment 2

[0038]Composite desulfurization agent ratio: 40g of electric grades, 40g of corn stover.

[0039]Method for preparing biomass-containing mesenchymal gravel composite calcium-based desulfurizers, including the following steps:

[0040]S1, the straw crushing with a raw material having a length of about 2 cm, mixing 40g of corn stover and 60g wet electric gravel, stirring rapidly for 30 min;

[0041]S2, combined S1 straw - electric gravel mixture in 25oC plas for 5 days to adjust;

[0042]S3, the straw-iron gravel mixture in S2 is naturally air-dried to water into 5% to produce straw-electric gravel solid;

[0043]S4, a straw-monuctable solid of S3 is granulated under 10 MPa pressure, and a composite calcium-based deanger having a particle size of 2 cm is produced.

[0044]Place 10 prepared composite calcium-based desulfurizers in 850oIn the tube furnace of C, enter the simulated flue gas, and the smoke CO2, O2SO2The volume fraction is 15%, 3%, 0.3%, respectively, with N2In order to balance the gas, aft...

Embodiment 3

[0046]Composite desulfurization agent ratio: 40g of electric grades, 40g of corn stover.

[0047]Method for preparing biomass-containing mesenchymal gravel composite calcium-based desulfurizers, including the following steps:

[0048]S1, the straw crushing with a raw material having a length of about 2 cm, mixing 60g of corn stover and 40g wet electric gravel, stirring rapidly for 30 min;

[0049]S2, combined S1 straw - electric gravel mixture in 23oC is placed for 6 days to adjust;

[0050]S3, the straw-iron gravel mixture in S2 is naturally air-dried to water into 10% to prepare straw-electric gravel solids;

[0051]S4, a straw-monuctable solid of S3 is granulated under 10 MPa pressure, and a composite calcium-based deanger having a particle size of 2 cm is produced.

[0052]Place 10 prepared composite calcium-based desulfurizers in 850oIn the tube furnace of C, enter the simulated flue gas, and the smoke CO2, O2SO2The volume fraction is 15%, 3%, 0.3%, respectively, with N2In order to balance the g...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
lengthaaaaaaaaaa
particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention relates to the field of desulfurization in circulating fluidized bed furnace, in particular to a carbide slag composite calcium-based sorbent based on biomass quenching and tempering anda preparation method thereof. According to the sorbent, the biomass is mixed with the wet carbide slag to adjust the moisture in the carbide slag, so that the furnace charging problem of the wet carbide slag can be solved without a heating the drying process; the carbide slag is quenched and tempered by utilizing biomass, chemical modification of carbide slag is realized, rich soluble potassium is contained in the biomass, the migration of potassium in the biomass to the carbide slag surface of solid waste-based calcium-based sorbent can be realized through the quenching and tempering, so that the diffusion capacity of CaO in the CaSO4 dense product layer is improved during the desulfurization process, and the calcium conversion rate of the calcium carbide slag in the furnace when put into the furnace as small particle diameters can still be achieved when the carbide slag is put into the furnace with relatively large particle diameters; the sorbent has the advantages of high utilization efficiency, good desulfurization performance, short preparation process, low production cost and the like. Not only can the synergistic effective utilization of solid waste carbide slag and agricultural biomass be realized, but also the cost of desulfurization in the circulating fluidized bed furnace can be reduced.

Description

Technical field[0001]The present invention relates to the field of desulfurization in the circulating fluidized bed furnace, and more specifically, there is a modulfue agent based on biomass massage-based monosensive composite calcium-based desulfurizers and preparation methods thereof.Background technique[0002]At present, the most commonly used desulfurization agent in the circulating fluidized bed furnace is calcium-based desulfurizer stone gray stone, and its desulfurization efficiency is Caco.3Comprehensive effect of decomposing reaction and CaO vulcanization, due to the vulcanization product CASO4(46cm3 / mol) molar volume is greater than Caco3(36.9cm3 / mol) and CAO (16.9cm3 / mol), thus makes the vulcanized product CASO4Clogging the micropores on the surface of the decomposition product CAO, hindering SO2Further reactions with unreacted CaO, resulting in calcium's sulfate of only 25-45%, to achieve SO2Emissions, companies have to make up for defects with low calcium-based deanic...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/81B01D53/50
CPCB01D53/508
Inventor 张圆圆程芳琴杨凤玲赵江婷郝艳红
Owner SHANXI UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Eureka Blog
Learn More
PatSnap group products