CN104724694A - Preparation method of rice straw biochar - Google Patents
Preparation method of rice straw biochar Download PDFInfo
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- CN104724694A CN104724694A CN201510123274.4A CN201510123274A CN104724694A CN 104724694 A CN104724694 A CN 104724694A CN 201510123274 A CN201510123274 A CN 201510123274A CN 104724694 A CN104724694 A CN 104724694A
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- 235000007164 Oryza sativa Nutrition 0.000 title claims abstract description 203
- 235000009566 rice Nutrition 0.000 title claims abstract description 203
- 239000010902 straw Substances 0.000 title claims abstract description 190
- 238000002360 preparation method Methods 0.000 title claims abstract description 22
- 240000007594 Oryza sativa Species 0.000 title 1
- 241000209094 Oryza Species 0.000 claims abstract description 202
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 127
- 238000001027 hydrothermal synthesis Methods 0.000 claims abstract description 21
- 239000012265 solid product Substances 0.000 claims description 61
- 238000006243 chemical reaction Methods 0.000 claims description 52
- 238000003763 carbonization Methods 0.000 claims description 44
- 239000003610 charcoal Substances 0.000 claims description 43
- 238000001914 filtration Methods 0.000 claims description 38
- 239000000047 product Substances 0.000 claims description 37
- 238000000926 separation method Methods 0.000 claims description 24
- 238000001035 drying Methods 0.000 claims description 20
- 230000008676 import Effects 0.000 claims description 20
- 239000000463 material Substances 0.000 claims description 18
- 238000002203 pretreatment Methods 0.000 claims description 18
- 230000035484 reaction time Effects 0.000 claims description 17
- 238000009423 ventilation Methods 0.000 claims description 17
- 239000007788 liquid Substances 0.000 claims description 15
- 238000001816 cooling Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 32
- 230000008569 process Effects 0.000 abstract description 22
- 239000002994 raw material Substances 0.000 abstract description 19
- 230000008901 benefit Effects 0.000 abstract description 11
- 239000002689 soil Substances 0.000 abstract description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 6
- 229910052799 carbon Inorganic materials 0.000 abstract description 6
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 abstract description 5
- 230000009467 reduction Effects 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 abstract description 2
- 239000001569 carbon dioxide Substances 0.000 abstract description 2
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 125000004122 cyclic group Chemical group 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 description 60
- 239000007787 solid Substances 0.000 description 29
- 239000002245 particle Substances 0.000 description 15
- 239000007791 liquid phase Substances 0.000 description 14
- 238000010298 pulverizing process Methods 0.000 description 14
- 238000011084 recovery Methods 0.000 description 14
- 239000002028 Biomass Substances 0.000 description 7
- 239000000203 mixture Substances 0.000 description 4
- 230000008439 repair process Effects 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000000197 pyrolysis Methods 0.000 description 2
- 239000012429 reaction media Substances 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000003905 agrochemical Substances 0.000 description 1
- 235000011089 carbon dioxide Nutrition 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000006114 decarboxylation reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000035558 fertility Effects 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- -1 pulverizes Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/05—Preparation or purification of carbon not covered by groups C01B32/15, C01B32/20, C01B32/25, C01B32/30
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Carbon And Carbon Compounds (AREA)
- Fertilizers (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a preparation method of rice straw biochar. The preparation method has the beneficial effects that rice straws serve as raw materials for preparation of biochar and the rice straws are transformed into biochar through hydrothermal reaction, thus providing a new rice straw utilizing mode, increasing the comprehensive utilization rates of the rice and the economic benefits and increasing the additional value; the preparation method is clean and green in processes, is simple to operate, conduces to achieving cyclic utilization of resources, is beneficial to carbon fixation and reduction of emission of carbon dioxide and has good ecological benefits; besides, the method is low in energy consumption and cost, has good industrial application prospects and can achieve sink increase and emission reduction; the prepared product can be also applied to improving soil and restoring the water environment and has extensive application prospects.
Description
Technical field
The present invention relates to charcoal preparing technical field, especially a kind of preparation method of rice straw charcoal.
Background technology
Charcoal (biochar) refers to the stable rich carbon solid that biomass are formed under anoxic or oxygen free condition.Research shows, in soil, add charcoal, can carry and improve soil fertility, promotes crop growth, and meanwhile, charcoal uses the release that can suppress greenhouse gases in soil, reduces the diffusion of agricultural chemicals in soil and the accumulation in animal and plant body.In addition, charcoal has adsorption to pollutent, adds charcoal and can improve water quality, repair water pollution in polluted-water.Therefore, abandoned biomass is carbonized into charcoal, be considered to a kind of method effectively consolidating carbon and biomass as resources.
The charring process of biomass can be divided into pyrolysis charring and hydro-thermal to carbonize two kinds.Wherein pyrolysis charring refers to that biomass are under an inert atmosphere, are heated to comparatively high temps, as 550 ~ 1300 DEG C, stay for some time thus occur carbonize method; Hydro-thermal charing is then medium with water, and in enclosed system, at a certain temperature, as 130 ~ 350 DEG C, water is from producing pressure or rare gas element adds pressure, and biomass, through complex reactions such as dehydration, decarboxylations, occur to carbonize the process changing into charcoal.Wherein, hydro-thermal charing directly can process the higher raw material of water ratio; Reaction medium is clean and reaction conditions is gentleer, and operation of equipment is easy, and contribute to retaining biological surface containing oxygen, nitrogen-containing functional group, be a kind of Perfected process preparing biological carbon materials of green.
Stalk is the biomass material of a class abundance, and rice straw is the important component part of agricultural stalk.China's rice growing area accounts for 1/4th of national food crop, and output then accounts for over half.But the utilization ratio of current rice straw is general not high, and only sub-fraction is used for feed, is mostly discarded in field or directly uses, burn.Crop straw burning can bring very serious topsoil, as increased content and the pellet of Carbon Dioxide in Air, reducing air visibility meter etc., being prohibited by many big cities.
Based on above-mentioned consideration, the present invention proposes a kind of is that raw material adopts hydro-thermal charing to prepare the method for rice straw charcoal with rice straw, aim to provide a kind of novel rice straw recycle mode, decreasing pollution, improve rice straw added value, realize increasing converging and reduce discharging, obtained product also can be used for the reparation improveing soil or water body environment.
Summary of the invention
The invention provides a kind of preparation method of rice straw charcoal, technique is simple, improves comprehensive utilization ratio and the added value of rice straw, has good economic benefit, achieve energy-saving and emission-reduction.
For achieving the above object, the preparation method of rice straw charcoal of the present invention comprises the following steps:
Pulverized by rice straw, mix with water, then import hydrothermal reaction kettle and carry out hydro-thermal carbonization reaction, the ratio of the quality of described rice straw and the volume of water is 1kg:5L ~ 1kg:20L;
Cooled by the product of hydro-thermal carbonization reaction, filtering separation, obtains rice straw charcoal after drying.
Further, the pre-treatment step of rice straw is also comprised: remove rice straw surface earth and foreign material.
Preferably, straw crusher is adopted to be pulverized by rice straw.
Preferably, the temperature of reaction of described hydro-thermal carbonization reaction is 150
oc ~ 300
oc.
Preferably, the reaction times of described hydro-thermal carbonization reaction is 2 h ~ 14 h.
Preferably, cooling temperature is 80
obelow C.
Preferably, filtering separation obtains the solid product that water ratio is 20 wt% ~ 30 wt%.
Preferably, described filtering separation adopts plate-and-frame filter press to carry out.
Further, drying step comprise solid product is placed in sunlight under naturally dry, be then placed in dry ventilation air-dry further.
Preferably, the water ratio of described rice straw charcoal is at 10 below %.
Beneficial effect of the present invention:
The invention provides a kind of preparation method of rice straw charcoal, comprising: pulverized by rice straw, mix with water, then import hydrothermal reaction kettle and carry out hydro-thermal carbonization reaction, the ratio of the quality of described rice straw and the volume of water is 1kg:5L ~ 1kg:20L; Cooled by the product of hydro-thermal carbonization reaction, filtering separation, obtains rice straw charcoal after drying.Compared with prior art, the present invention changes rice straw into charcoal by hydro-thermal charing, provide a kind of Land use systems of new rice straw, improve utilization ratio and the added value of rice straw, add economic benefit, and be conducive to the discharge of the fixing of carbon element and minimizing carbonic acid gas, there is good ecological benefits and social benefit.In addition, in the present invention, rice straw raw material is without the need to pre-treatment, and hydro-thermal reaction medium is green, reaction conditions is gentle, and conversion unit structure is simple, easy and simple to handle, and less energy consumption, cost are low; Obtained rice straw charcoal product can be used for improvement soil or repairs water body environment, has a extensive future.
Accompanying drawing explanation
Fig. 1 is the process flow sheet that the embodiment of the present invention 1 prepares rice straw charcoal.
Embodiment
In order to understand the present invention further, below in conjunction with embodiment, the preferred embodiments of the invention are described in detail.But should be appreciated that these describe just for further illustrating the features and advantages of the present invention, instead of limiting to the claimed invention.
The embodiment provides a kind of preparation method of rice straw charcoal, comprise the following steps:
Pulverized by rice straw, mix with water, then import hydrothermal reaction kettle and carry out hydro-thermal carbonization reaction, the ratio of the quality of described rice straw and the volume of water is 1kg:5L ~ 1kg:20L; Cooled by the product of hydro-thermal carbonization reaction, filtering separation, obtains rice straw charcoal after drying.
In technique scheme, present invention achieves the comprehensive utilization of rice straw, improve added value, and energy carbon fixation and emission reduction, obtain the product that can be used for environmental pollution and repair, there is good economic benefit and social benefit.
Preferably, the present invention also comprises the pre-treatment step of rice straw: remove rice straw surface earth and foreign material.
Preferably, the present invention adopts straw crusher to be pulverized by rice straw, obtains small-particle and little block stock, is conducive to carrying out hydro-thermal carbonization reaction with water.
Preferably, be that rice straw within the scope of 1kg:5L ~ 1kg:20L and water import hydrothermal reaction kettle and carries out hydro-thermal carbonization reaction by quality, volume ratio, be specially: rice straw is mixed with water, import water heating kettle, airtight, guarantee the stopping property post-heating of water heating kettle.The temperature of reaction of described hydro-thermal carbonization reaction is preferably 150
oc ~ 300
oc, is more preferably 200
oc ~ 250
oc; The reaction times of described hydro-thermal carbonization reaction is preferably 2 h ~ 14 h, is more preferably 5 h ~ 10 h.
The present invention adopts hydro-thermal charring process to prepare rice straw charcoal, technique is simple, reaction temperature and, preparation process environmental protection and can the new way that utilizes of efficient extn rice straw, has great importance for the utilization ratio and added value improving rice straw.
Preferably, below cooling water heat reactor to 80 DEG C, adopt plate-and-frame filter press to carry out filtering separation afterwards, filtering separation preferably water ratio is the solid product of 20 wt% ~ 30 wt%.
Preferably, naturally dry under above-mentioned solid product is preferably placed in sunlight by drying, be then placed in dry ventilation air-dry further, obtain the water ratio of rice straw charcoal at 10 below %.
As can be seen from above scheme, the present invention utilizes rice straw for raw material, after rice harves, is reclaimed by residual rice straw, pulverizes, mix be placed in water heating kettle with water, forms rice straw charcoal product through hydro-thermal charing.The method increase the comprehensive utilization ratio of product, process environmental protection, consume energy low, achieve the recycle of carbon fixation and emission reduction and resource, there are obvious ecological benefits; In addition, this method cost is lower, improves the economic benefit of rice straw, and has good industrial applications prospect.
In order to understand the present invention further, be described in detail to technical scheme provided by the invention below in conjunction with embodiment, protection scope of the present invention is not limited by the following examples.
Embodiment 1:
As shown in Figure 1, rice straw charcoal is prepared in accordance with the following steps:
The recovery of step one, rice straw, pre-treatment: after rice harves, reclaim residual rice straw, removes rice straw surface earth and foreign material;
The pulverizing of step 2, rice straw: pulverized by rice straw, obtain small-particle and little block stock (length is less than 1 cm), stores, for subsequent use;
The hydro-thermal charing of step 3, rice straw: mixed with water by rice straw, import water heating kettle, guarantee that water heating kettle is airtight, heating carries out hydro-thermal carbonization reaction, hydrothermal temperature 150
oc, reaction times 14 h, rice straw raw material and water solid-to-liquid ratio 1kg:5L;
The filtering separation of step 4, solid, liquid phase product: after hydro-thermal carbonization process terminates, stops heating, hydrothermal reaction kettle is cooled to lower than 80
oafter C, drive still and derive reaction solution and solid product, obtain the solid product that water ratio is 20 wt%-30 wt% after filtration;
The drying of step 5, solid product: naturally dry under solid product being placed in sunlight, is then placed in air-dry, the storage further of dry ventilation, obtains the solid water rice straw charcoal product of water ratio lower than 10 %.
Embodiment 2:
The recovery of step one, rice straw, pre-treatment: after rice harves, reclaim residual rice straw, removes rice straw surface earth and foreign material;
The pulverizing of step 2, rice straw: pulverized by rice straw, obtain small-particle and little block stock (length is less than 1 cm), stores, for subsequent use;
The hydro-thermal charing of step 3, rice straw: mixed with water by rice straw, import water heating kettle, guarantee that water heating kettle is airtight, heating carries out hydro-thermal carbonization reaction, hydrothermal temperature 200
oc, reaction times 6 h, rice straw raw material and water solid-to-liquid ratio 1kg:10L;
The filtering separation of step 4, solid, liquid phase product: after hydro-thermal carbonization process terminates, stops heating, hydrothermal reaction kettle is cooled to lower than 80
oafter C, drive still and derive reaction solution and solid product, obtain the solid product that water ratio is 20 wt%-30 wt% after filtration;
The drying of step 5, solid product: naturally dry under solid product being placed in sunlight, is then placed in air-dry, the storage further of dry ventilation, obtains the solid water rice straw charcoal product of water ratio lower than 10 %.
Embodiment 3:
The recovery of step one, rice straw, pre-treatment: after rice harves, reclaim residual rice straw, removes rice straw surface earth and foreign material;
The pulverizing of step 2, rice straw: pulverized by rice straw, obtain small-particle and little block stock (length is less than 1 cm), stores, for subsequent use;
The hydro-thermal charing of step 3, rice straw: mixed with water by rice straw, import water heating kettle, guarantee that water heating kettle is airtight, heating carries out hydro-thermal carbonization reaction, hydrothermal temperature 250
oc, reaction times 6 h, rice straw raw material and water solid-to-liquid ratio 1kg:15L;
The filtering separation of step 4, solid, liquid phase product: after hydro-thermal carbonization process terminates, stops heating, hydrothermal reaction kettle is cooled to lower than 80
oafter C, drive still and derive reaction solution and solid product, obtain the solid product that water ratio is 20 wt%-30 wt% after filtration;
Step 5, solid product dry under being placed in sunlight naturally, are then placed in air-dry, the storage further of dry ventilation, obtain the solid water rice straw charcoal product of water ratio lower than 10 %.
Embodiment 4
The recovery of step one, rice straw, pre-treatment: after rice harves, reclaim residual rice straw, removes rice straw surface earth and foreign material;
The pulverizing of step 2, rice straw: pulverized by rice straw, obtain small-particle and little block stock (length is less than 1 cm), stores, for subsequent use;
The hydro-thermal charing of step 3, rice straw: mixed with water by rice straw, import water heating kettle, guarantee that water heating kettle is airtight, heating carries out hydro-thermal carbonization reaction, hydrothermal temperature 300
oc, reaction times 2 h, rice straw raw material and water solid-to-liquid ratio 1kg:5L;
The filtering separation of step 4, solid, liquid phase product: after hydro-thermal carbonization process terminates, stops heating, hydrothermal reaction kettle is cooled to lower than 80
oafter C, drive still and derive reaction solution and solid product, obtain the solid product that water ratio is 20 wt%-30 wt% after filtration;
The drying of step 5, solid product: naturally dry under solid product being placed in sunlight, is then placed in air-dry, the storage further of dry ventilation, obtains the solid water rice straw charcoal product of water ratio lower than 10 %.
Embodiment 5
The recovery of step one, rice straw, pre-treatment: after rice harves, reclaim residual rice straw, removes rice straw surface earth and foreign material;
The pulverizing of step 2, rice straw: pulverized by rice straw, obtain small-particle and little block stock (length is less than 1 cm), stores, for subsequent use;
The hydro-thermal charing of step 3, rice straw: mixed with water by rice straw, import water heating kettle, guarantee that water heating kettle is airtight, heating carries out hydro-thermal carbonization reaction, hydrothermal temperature 250
oc, reaction times 2 h, rice straw raw material and water solid-to-liquid ratio 1kg:20L;
The filtering separation of step 4, solid, liquid phase product: after hydro-thermal carbonization process terminates, stops heating, hydrothermal reaction kettle is cooled to lower than 80
oafter C, drive still and derive reaction solution and solid product, obtain the solid product that water ratio is 20 wt%-30 wt% after filtration;
The drying of step 5, solid product: naturally dry under solid product being placed in sunlight, is then placed in air-dry, the storage further of dry ventilation, obtains the solid water rice straw charcoal product of water ratio lower than 10 %.
Embodiment 6
The recovery of step one, rice straw, pre-treatment: after rice harves, reclaim residual rice straw, removes rice straw surface earth and foreign material;
The pulverizing of step 2, rice straw: pulverized by rice straw, obtain small-particle and little block stock (length is less than 1 cm), stores, for subsequent use;
The hydro-thermal charing of step 3, rice straw: mixed with water by rice straw, import water heating kettle, guarantee that water heating kettle is airtight, heating carries out hydro-thermal carbonization reaction, hydrothermal temperature 200
oc, reaction times 10 h, rice straw raw material and water solid-to-liquid ratio 1kg:5L;
The filtering separation of step 4, solid, liquid phase product: after hydro-thermal carbonization process terminates, stops heating, hydrothermal reaction kettle is cooled to lower than 80
oafter C, drive still and derive reaction solution and solid product, obtain the solid product that water ratio is 20 wt%-30 wt% after filtration;
The drying of step 5, solid product: naturally dry under solid product being placed in sunlight, is then placed in air-dry, the storage further of dry ventilation, obtains the solid water rice straw charcoal product of water ratio lower than 10 %.
Embodiment 7
The recovery of step one, rice straw, pre-treatment: after rice harves, reclaim residual rice straw, removes rice straw surface earth and foreign material;
The pulverizing of step 2, rice straw: pulverized by rice straw, obtain small-particle and little block stock (length is less than 1 cm), stores, for subsequent use;
The hydro-thermal charing of step 3, rice straw: mixed with water by rice straw, import water heating kettle, guarantee that water heating kettle is airtight, heating carries out hydro-thermal carbonization reaction, hydrothermal temperature 150
oc, reaction times 10 h, rice straw raw material and water solid-to-liquid ratio 1kg:20L;
The filtering separation of step 4, solid, liquid phase product: after hydro-thermal carbonization process terminates, stops heating, hydrothermal reaction kettle is cooled to lower than 80
oafter C, drive still and derive reaction solution and solid product, obtain the solid product that water ratio is 20 wt%-30 wt% after filtration;
The drying of step 5, solid product: naturally dry under solid product being placed in sunlight, is then placed in air-dry, the storage further of dry ventilation, obtains the solid water rice straw charcoal product of water ratio lower than 10 %.
Embodiment 8
The recovery of step one, rice straw, pre-treatment: after rice harves, reclaim residual rice straw, removes rice straw surface earth and foreign material;
The pulverizing of step 2, rice straw: pulverized by rice straw, obtain small-particle and little block stock (length is less than 1 cm), stores, for subsequent use;
The hydro-thermal charing of step 3, rice straw: mixed with water by rice straw, import water heating kettle, guarantee that water heating kettle is airtight, heating carries out hydro-thermal carbonization reaction, hydrothermal temperature 300
oc, reaction times 6 h, rice straw raw material and water solid-to-liquid ratio 1kg:10L;
The filtering separation of step 4, solid, liquid phase product: after hydro-thermal carbonization process terminates, stops heating, hydrothermal reaction kettle is cooled to lower than 80
oafter C, drive still and derive reaction solution and solid product, obtain the solid product that water ratio is 20 wt%-30 wt% after filtration;
The drying of step 5, solid product: naturally dry under solid product being placed in sunlight, is then placed in air-dry, the storage further of dry ventilation, obtains the solid water rice straw charcoal product of water ratio lower than 10 %.
Embodiment 9
The recovery of step one, rice straw, pre-treatment: after rice harves, reclaim residual rice straw, removes rice straw surface earth and foreign material;
The pulverizing of step 2, rice straw: pulverized by rice straw, obtain small-particle and little block stock (length is less than 1 cm), stores, for subsequent use;
The hydro-thermal charing of step 3, rice straw: mixed with water by rice straw, import water heating kettle, guarantee that water heating kettle is airtight, heating carries out hydro-thermal carbonization reaction, hydrothermal temperature 250
oc, reaction times 10 h, rice straw raw material and water solid-to-liquid ratio 1kg:10L;
The filtering separation of step 4, solid, liquid phase product: after hydro-thermal carbonization process terminates, stops heating, hydrothermal reaction kettle is cooled to lower than 80
oafter C, drive still and derive reaction solution and solid product, obtain the solid product that water ratio is 20 wt%-30 wt% after filtration;
The drying of step 5, solid product: naturally dry under solid product being placed in sunlight, is then placed in air-dry, the storage further of dry ventilation, obtains the solid water rice straw charcoal product of water ratio lower than 10 %.
Embodiment 10
The recovery of step one, rice straw, pre-treatment: after rice harves, reclaim residual rice straw, removes rice straw surface earth and foreign material;
The pulverizing of step 2, rice straw: pulverized by rice straw, obtain small-particle and little block stock (length is less than 1 cm), stores, for subsequent use;
The hydro-thermal charing of step 3, rice straw: mixed with water by rice straw, import water heating kettle, guarantee that water heating kettle is airtight, heating carries out hydro-thermal carbonization reaction, hydrothermal temperature 200
oc, reaction times 14 h, rice straw raw material and water solid-to-liquid ratio 1kg:15L;
The filtering separation of step 4, solid, liquid phase product: after hydro-thermal carbonization process terminates, stops heating, hydrothermal reaction kettle is cooled to lower than 80
oafter C, drive still and derive reaction solution and solid product, obtain the solid product that water ratio is 20 wt%-30 wt% after filtration;
The drying of step 5, solid product: naturally dry under solid product being placed in sunlight, is then placed in air-dry, the storage further of dry ventilation, obtains the solid water rice straw charcoal product of water ratio lower than 10 %.
Embodiment 11
The recovery of step one, rice straw, pre-treatment: after rice harves, reclaim residual rice straw, removes rice straw surface earth and foreign material;
The pulverizing of step 2, rice straw: pulverized by rice straw, obtain small-particle and little block stock (length is less than 1 cm), stores, for subsequent use;
The hydro-thermal charing of step 3, rice straw: mixed with water by rice straw, import water heating kettle, guarantee that water heating kettle is airtight, heating carries out hydro-thermal carbonization reaction, hydrothermal temperature 250
oc, reaction times 14 h, rice straw raw material and water solid-to-liquid ratio 1kg:5L;
The filtering separation of step 4, solid, liquid phase product: after hydro-thermal carbonization process terminates, stops heating, hydrothermal reaction kettle is cooled to lower than 80
oafter C, drive still and derive reaction solution and solid product, obtain the solid product that water ratio is 20 wt%-30 wt% after filtration;
The drying of step 5, solid product: naturally dry under solid product being placed in sunlight, is then placed in air-dry, the storage further of dry ventilation, obtains the solid water rice straw charcoal product of water ratio lower than 10 %.
Embodiment 12
The recovery pre-treatment of step one, rice straw: after rice harves, reclaims residual rice straw, removes rice straw surface earth and foreign material;
The pulverizing of step 2, rice straw: pulverized by rice straw, obtain small-particle and little block stock (length is less than 1 cm), stores, for subsequent use;
The hydro-thermal charing of step 3, rice straw: mixed with water by rice straw, import water heating kettle, guarantee that water heating kettle is airtight, heating carries out hydro-thermal carbonization reaction, hydrothermal temperature 300
oc, reaction times 10 h, rice straw raw material and water solid-to-liquid ratio 1kg:20L;
The filtering separation of step 4, solid, liquid phase product: after hydro-thermal carbonization process terminates, stops heating, hydrothermal reaction kettle is cooled to lower than 80
oafter C, drive still and derive reaction solution and solid product, obtain the solid product that water ratio is 20 wt%-30 wt% after filtration;
The drying of step 5, solid product: naturally dry under solid product being placed in sunlight, is then placed in air-dry, the storage further of dry ventilation, obtains the solid water rice straw charcoal product of water ratio lower than 10 %.
Embodiment 13
The recovery of step one, rice straw, pre-treatment: after rice harves, reclaim residual rice straw, removes rice straw surface earth and foreign material;
The pulverizing of step 2, rice straw: pulverized by rice straw, obtain small-particle and little block stock (length is less than 1 cm), stores, for subsequent use;
The hydro-thermal charing of step 3, rice straw: mixed with water by rice straw, import water heating kettle, guarantee that water heating kettle is airtight, heating carries out hydro-thermal carbonization reaction, hydrothermal temperature 150
oc, reaction times 6 h, rice straw raw material and water solid-to-liquid ratio 1kg:15L;
The filtering separation of step 4, solid, liquid phase product: after hydro-thermal carbonization process terminates, stops heating, hydrothermal reaction kettle is cooled to lower than 80
oafter C, drive still and derive reaction solution and solid product, obtain the solid product that water ratio is 20 wt%-30 wt% after filtration;
The drying of step 5, solid product: naturally dry under solid product being placed in sunlight, is then placed in air-dry, the storage further of dry ventilation, obtains the solid water rice straw charcoal product of water ratio lower than 10 %.
Embodiment 14
The recovery of step one, rice straw, pre-treatment: after rice harves, reclaim residual rice straw, removes rice straw surface earth and foreign material;
The pulverizing of step 2, rice straw: pulverized by rice straw, obtain small-particle and little block stock (length is less than 1 cm), stores, for subsequent use;
The hydro-thermal charing of step 3, rice straw: mixed with water by rice straw, import water heating kettle, guarantee that water heating kettle is airtight, heating carries out hydro-thermal carbonization reaction, hydrothermal temperature 200
oc, reaction times 2 h, rice straw raw material and water solid-to-liquid ratio 1kg:20L;
The filtering separation of step 4, solid, liquid phase product: after hydro-thermal carbonization process terminates, stops heating, hydrothermal reaction kettle is cooled to lower than 80
oafter C, drive still and derive reaction solution and solid product, obtain the solid product that water ratio is 20 wt%-30 wt% after filtration;
The drying of step 5, solid product: naturally dry under solid product being placed in sunlight, is then placed in air-dry, the storage further of dry ventilation, obtains the solid water rice straw charcoal product of water ratio lower than 10 %.
The explanation of above embodiment just understands method of the present invention and core concept thereof for helping.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improve and modify and also fall in the protection domain of the claims in the present invention.
Claims (10)
1. a preparation method for rice straw charcoal, is characterized in that, comprises the following steps:
Pulverized by rice straw, mix with water, then import hydrothermal reaction kettle and carry out hydro-thermal carbonization reaction, the solid-to-liquid ratio of described rice straw and water is 1kg:5L ~ 1kg:20L;
Cooled by the product of hydro-thermal carbonization reaction, filtering separation, obtains rice straw charcoal after drying.
2. preparation method as claimed in claim 1, is characterized in that, also comprise the pre-treatment step of rice straw: remove rice straw surface earth and foreign material.
3. preparation method as claimed in claim 1, is characterized in that, adopts straw crusher to be pulverized by rice straw.
4. preparation method as claimed in claim 1, it is characterized in that, the temperature of reaction of described hydro-thermal carbonization reaction is 150
oc ~ 300
oc.
5. preparation method as claimed in claim 1, it is characterized in that, the reaction times of described hydro-thermal carbonization reaction is 2 h ~ 14 h.
6. preparation method as claimed in claim 1, it is characterized in that, cooling temperature is 80
obelow C.
7. preparation method as claimed in claim 1, it is characterized in that, filtering separation obtains the solid product that water ratio is 20 wt% ~ 30 wt%.
8. preparation method as claimed in claim 1, is characterized in that, described filtering separation adopts plate-and-frame filter press to carry out.
9. preparation method as claimed in claim 1, is characterized in that, drying step comprise solid product is placed in sunlight under naturally dry, be then placed in dry ventilation air-dry further.
10. preparation method as claimed in claim 1, it is characterized in that, the water ratio of described rice straw charcoal is at 10 below %.
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| CN201510123274.4A CN104724694A (en) | 2015-03-20 | 2015-03-20 | Preparation method of rice straw biochar |
| PCT/CN2016/072722 WO2016150252A1 (en) | 2015-03-20 | 2016-01-29 | Rice straw biochar preparation method |
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| CN105175175A (en) * | 2015-07-14 | 2015-12-23 | 河南农业大学 | Treatment method used for producing biochar from tobacco waste |
| WO2016150252A1 (en) * | 2015-03-20 | 2016-09-29 | 浙江科技学院 | Rice straw biochar preparation method |
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| CN104724694A (en) * | 2015-03-20 | 2015-06-24 | 浙江科技学院 | Preparation method of rice straw biochar |
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